* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2014 */
+/* Copyright (c) The Exim Maintainers 2020 - 2022 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Functions concerned with verifying things. The original code for callout
caching was contributed by Kevin Fleming (but I hacked it around a bit). */
#define CUTTHROUGH_CMD_TIMEOUT 30 /* timeout for cutthrough-routing calls */
#define CUTTHROUGH_DATA_TIMEOUT 60 /* timeout for cutthrough-routing calls */
-static smtp_outblock ctblock;
+static smtp_context ctctx;
uschar ctbuffer[8192];
-/* Structure for caching DNSBL lookups */
+static uschar cutthrough_response(client_conn_ctx *, char, uschar **, int);
-typedef struct dnsbl_cache_block {
- dns_address *rhs;
- uschar *text;
- int rc;
- BOOL text_set;
-} dnsbl_cache_block;
-
-
-/* Anchor for DNSBL cache */
-
-static tree_node *dnsbl_cache = NULL;
-
-
-/* Bits for match_type in one_check_dnsbl() */
-
-#define MT_NOT 1
-#define MT_ALL 2
-
-static uschar cutthrough_response(char, uschar **);
/*************************************************
time_t now;
dbdata_callout_cache *cache_record;
-cache_record = dbfn_read_with_length(dbm_file, key, &length);
-
-if (cache_record == NULL)
+if (!(cache_record = dbfn_read_with_length(dbm_file, key, &length)))
{
- HDEBUG(D_verify) debug_printf("callout cache: no %s record found\n", type);
+ HDEBUG(D_verify) debug_printf_indent("callout cache: no %s record found for %s\n", type, key);
return NULL;
}
if (now - cache_record->time_stamp > expire)
{
- HDEBUG(D_verify) debug_printf("callout cache: %s record expired\n", type);
+ HDEBUG(D_verify) debug_printf_indent("callout cache: %s record expired for %s\n", type, key);
return NULL;
}
{
if (length == sizeof(dbdata_callout_cache_obs))
{
- dbdata_callout_cache *new = store_get(sizeof(dbdata_callout_cache));
+ dbdata_callout_cache * new = store_get(sizeof(dbdata_callout_cache), GET_UNTAINTED);
memcpy(new, cache_record, length);
new->postmaster_stamp = new->random_stamp = new->time_stamp;
cache_record = new;
cache_record->random_result = ccache_unknown;
}
-HDEBUG(D_verify) debug_printf("callout cache: found %s record\n", type);
+HDEBUG(D_verify) debug_printf_indent("callout cache: found %s record for %s\n", type, key);
return cache_record;
}
-/*************************************************
-* Do callout verification for an address *
-*************************************************/
-
-/* This function is called from verify_address() when the address has routed to
-a host list, and a callout has been requested. Callouts are expensive; that is
-why a cache is used to improve the efficiency.
-
-Arguments:
- addr the address that's been routed
- host_list the list of hosts to try
- tf the transport feedback block
-
- ifstring "interface" option from transport, or NULL
- portstring "port" option from transport, or NULL
- protocolstring "protocol" option from transport, or NULL
- callout the per-command callout timeout
- callout_overall the overall callout timeout (if < 0 use 4*callout)
- callout_connect the callout connection timeout (if < 0 use callout)
- options the verification options - these bits are used:
- vopt_is_recipient => this is a recipient address
- vopt_callout_no_cache => don't use callout cache
- vopt_callout_fullpm => if postmaster check, do full one
- vopt_callout_random => do the "random" thing
- vopt_callout_recipsender => use real sender for recipient
- vopt_callout_recippmaster => use postmaster for recipient
- se_mailfrom MAIL FROM address for sender verify; NULL => ""
- pm_mailfrom if non-NULL, do the postmaster check with this sender
+/* Check the callout cache.
+Options * pm_mailfrom may be modified by cache partial results.
-Returns: OK/FAIL/DEFER
+Return: TRUE if result found
*/
-static int
-do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
- int callout, int callout_overall, int callout_connect, int options,
- uschar *se_mailfrom, uschar *pm_mailfrom)
+static BOOL
+cached_callout_lookup(address_item * addr, uschar * address_key,
+ uschar * from_address, int * opt_ptr, uschar ** pm_ptr,
+ int * yield, uschar ** failure_ptr,
+ dbdata_callout_cache * new_domain_record, int * old_domain_res)
{
-BOOL is_recipient = (options & vopt_is_recipient) != 0;
-BOOL callout_no_cache = (options & vopt_callout_no_cache) != 0;
-BOOL callout_random = (options & vopt_callout_random) != 0;
-
-int yield = OK;
-int old_domain_cache_result = ccache_accept;
-BOOL done = FALSE;
-uschar *address_key;
-uschar *from_address;
-uschar *random_local_part = NULL;
-const uschar *save_deliver_domain = deliver_domain;
-uschar **failure_ptr = is_recipient?
- &recipient_verify_failure : &sender_verify_failure;
+int options = *opt_ptr;
open_db dbblock;
open_db *dbm_file = NULL;
-dbdata_callout_cache new_domain_record;
-dbdata_callout_cache_address new_address_record;
-host_item *host;
-time_t callout_start_time;
-new_domain_record.result = ccache_unknown;
-new_domain_record.postmaster_result = ccache_unknown;
-new_domain_record.random_result = ccache_unknown;
-
-memset(&new_address_record, 0, sizeof(new_address_record));
-
-/* For a recipient callout, the key used for the address cache record must
-include the sender address if we are using the real sender in the callout,
-because that may influence the result of the callout. */
-
-address_key = addr->address;
-from_address = US"";
-
-if (is_recipient)
- {
- if (options & vopt_callout_recipsender)
- {
- address_key = string_sprintf("%s/<%s>", addr->address, sender_address);
- from_address = sender_address;
- }
- else if (options & vopt_callout_recippmaster)
- {
- address_key = string_sprintf("%s/<postmaster@%s>", addr->address,
- qualify_domain_sender);
- from_address = string_sprintf("postmaster@%s", qualify_domain_sender);
- }
- }
-
-/* For a sender callout, we must adjust the key if the mailfrom address is not
-empty. */
-
-else
- {
- from_address = (se_mailfrom == NULL)? US"" : se_mailfrom;
- if (from_address[0] != 0)
- address_key = string_sprintf("%s/<%s>", addr->address, from_address);
- }
-
-/* Open the callout cache database, it it exists, for reading only at this
+/* Open the callout cache database, if it exists, for reading only at this
stage, unless caching has been disabled. */
-if (callout_no_cache)
+if (options & vopt_callout_no_cache)
{
- HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n");
+ HDEBUG(D_verify) debug_printf_indent("callout cache: disabled by no_cache\n");
}
-else if ((dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)) == NULL)
+else if (!(dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE, TRUE)))
{
- HDEBUG(D_verify) debug_printf("callout cache: not available\n");
+ HDEBUG(D_verify) debug_printf_indent("callout cache: not available\n");
}
-
-/* If a cache database is available see if we can avoid the need to do an
-actual callout by making use of previously-obtained data. */
-
-if (dbm_file != NULL)
+else
{
- dbdata_callout_cache_address *cache_address_record;
- dbdata_callout_cache *cache_record = get_callout_cache_record(dbm_file,
- addr->domain, US"domain",
- callout_cache_domain_positive_expire,
- callout_cache_domain_negative_expire);
+ /* If a cache database is available see if we can avoid the need to do an
+ actual callout by making use of previously-obtained data. */
+
+ dbdata_callout_cache_address * cache_address_record;
+ dbdata_callout_cache * cache_record = get_callout_cache_record(dbm_file,
+ addr->domain, US"domain",
+ callout_cache_domain_positive_expire, callout_cache_domain_negative_expire);
/* If an unexpired cache record was found for this domain, see if the callout
process can be short-circuited. */
- if (cache_record != NULL)
+ if (cache_record)
{
/* In most cases, if an early command (up to and including MAIL FROM:<>)
was rejected, there is no point carrying on. The callout fails. However, if
not to disturb the cached domain value if this whole verification succeeds
(we don't want it turning into "accept"). */
- old_domain_cache_result = cache_record->result;
+ *old_domain_res = cache_record->result;
- if (cache_record->result == ccache_reject ||
- (*from_address == 0 && cache_record->result == ccache_reject_mfnull))
+ if ( cache_record->result == ccache_reject
+ || *from_address == 0 && cache_record->result == ccache_reject_mfnull)
{
- setflag(addr, af_verify_nsfail);
HDEBUG(D_verify)
- debug_printf("callout cache: domain gave initial rejection, or "
- "does not accept HELO or MAIL FROM:<>\n");
+ debug_printf_indent("callout cache: domain gave initial rejection, or "
+ "does not accept HELO or MAIL FROM:<>\n");
setflag(addr, af_verify_nsfail);
addr->user_message = US"(result of an earlier callout reused).";
- yield = FAIL;
+ *yield = FAIL;
*failure_ptr = US"mail";
- goto END_CALLOUT;
+ dbfn_close(dbm_file);
+ return TRUE;
}
/* If a previous check on a "random" local part was accepted, we assume
the data in the new record. If a random check is required but hasn't been
done, skip the remaining cache processing. */
- if (callout_random) switch(cache_record->random_result)
+ if (options & vopt_callout_random) switch(cache_record->random_result)
{
case ccache_accept:
- HDEBUG(D_verify)
- debug_printf("callout cache: domain accepts random addresses\n");
- goto END_CALLOUT; /* Default yield is OK */
+ HDEBUG(D_verify)
+ debug_printf_indent("callout cache: domain accepts random addresses\n");
+ *failure_ptr = US"random";
+ dbfn_close(dbm_file);
+ return TRUE; /* Default yield is OK */
case ccache_reject:
- HDEBUG(D_verify)
- debug_printf("callout cache: domain rejects random addresses\n");
- callout_random = FALSE;
- new_domain_record.random_result = ccache_reject;
- new_domain_record.random_stamp = cache_record->random_stamp;
- break;
+ HDEBUG(D_verify)
+ debug_printf_indent("callout cache: domain rejects random addresses\n");
+ *opt_ptr = options & ~vopt_callout_random;
+ new_domain_record->random_result = ccache_reject;
+ new_domain_record->random_stamp = cache_record->random_stamp;
+ break;
default:
- HDEBUG(D_verify)
- debug_printf("callout cache: need to check random address handling "
- "(not cached or cache expired)\n");
- goto END_CACHE;
+ HDEBUG(D_verify)
+ debug_printf_indent("callout cache: need to check random address handling "
+ "(not cached or cache expired)\n");
+ dbfn_close(dbm_file);
+ return FALSE;
}
/* If a postmaster check is requested, but there was a previous failure,
but has not been done before, we are going to have to do a callout, so skip
remaining cache processing. */
- if (pm_mailfrom != NULL)
+ if (*pm_ptr)
{
if (cache_record->postmaster_result == ccache_reject)
- {
- setflag(addr, af_verify_pmfail);
- HDEBUG(D_verify)
- debug_printf("callout cache: domain does not accept "
- "RCPT TO:<postmaster@domain>\n");
- yield = FAIL;
- *failure_ptr = US"postmaster";
- setflag(addr, af_verify_pmfail);
- addr->user_message = US"(result of earlier verification reused).";
- goto END_CALLOUT;
- }
+ {
+ setflag(addr, af_verify_pmfail);
+ HDEBUG(D_verify)
+ debug_printf_indent("callout cache: domain does not accept "
+ "RCPT TO:<postmaster@domain>\n");
+ *yield = FAIL;
+ *failure_ptr = US"postmaster";
+ setflag(addr, af_verify_pmfail);
+ addr->user_message = US"(result of earlier verification reused).";
+ dbfn_close(dbm_file);
+ return TRUE;
+ }
if (cache_record->postmaster_result == ccache_unknown)
- {
- HDEBUG(D_verify)
- debug_printf("callout cache: need to check RCPT "
- "TO:<postmaster@domain> (not cached or cache expired)\n");
- goto END_CACHE;
- }
+ {
+ HDEBUG(D_verify)
+ debug_printf_indent("callout cache: need to check RCPT "
+ "TO:<postmaster@domain> (not cached or cache expired)\n");
+ dbfn_close(dbm_file);
+ return FALSE;
+ }
/* If cache says OK, set pm_mailfrom NULL to prevent a redundant
postmaster check if the address itself has to be checked. Also ensure
that the value in the cache record is preserved (with its old timestamp).
*/
- HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT "
-
"TO:<postmaster@domain>\n");
- pm_mailfrom = NULL;
- new_domain_record.postmaster_result = ccache_accept;
- new_domain_record.postmaster_stamp = cache_record->postmaster_stamp;
+ HDEBUG(D_verify) debug_printf_indent("callout cache: domain accepts RCPT "
+ "TO:<postmaster@domain>\n");
+ *pm_ptr = NULL;
+ new_domain_record->postmaster_result = ccache_accept;
+ new_domain_record->postmaster_stamp = cache_record->postmaster_stamp;
}
}
sender address if we are doing a recipient callout with a non-empty sender).
*/
- cache_address_record = (dbdata_callout_cache_address *)
- get_callout_cache_record(dbm_file,
- address_key, US"address",
- callout_cache_positive_expire,
- callout_cache_negative_expire);
+ if (!(cache_address_record = (dbdata_callout_cache_address *)
+ get_callout_cache_record(dbm_file, address_key, US"address",
+ callout_cache_positive_expire, callout_cache_negative_expire)))
+ {
+ dbfn_close(dbm_file);
+ return FALSE;
+ }
- if (cache_address_record != NULL)
+ if (cache_address_record->result == ccache_accept)
{
- if (cache_address_record->result == ccache_accept)
- {
- HDEBUG(D_verify)
- debug_printf("callout cache: address record is positive\n");
- }
- else
- {
- HDEBUG(D_verify)
- debug_printf("callout cache: address record is negative\n");
- addr->user_message = US"Previous (cached) callout verification failure";
- *failure_ptr = US"recipient";
- yield = FAIL;
- }
- goto END_CALLOUT;
+ HDEBUG(D_verify)
+ debug_printf_indent("callout cache: address record is positive\n");
+ }
+ else
+ {
+ HDEBUG(D_verify)
+ debug_printf_indent("callout cache: address record is negative\n");
+ addr->user_message = US"Previous (cached) callout verification failure";
+ *failure_ptr = US"recipient";
+ *yield = FAIL;
}
/* Close the cache database while we actually do the callout for real. */
- END_CACHE:
dbfn_close(dbm_file);
- dbm_file = NULL;
- }
-
-if (!addr->transport)
- {
- HDEBUG(D_verify) debug_printf("cannot callout via null transport\n");
+ return TRUE;
}
-else if (Ustrcmp(addr->transport->driver_name, "smtp") != 0)
- log_write(0, LOG_MAIN|LOG_PANIC|LOG_CONFIG_FOR, "callout transport '%s': %s is non-smtp",
- addr->transport->name, addr->transport->driver_name);
-else
- {
- smtp_transport_options_block *ob =
- (smtp_transport_options_block *)addr->transport->options_block;
-
- /* The information wasn't available in the cache, so we have to do a real
- callout and save the result in the cache for next time, unless no_cache is set,
- or unless we have a previously cached negative random result. If we are to test
- with a random local part, ensure that such a local part is available. If not,
- log the fact, but carry on without randomming. */
-
- if (callout_random && callout_random_local_part != NULL)
- if (!(random_local_part = expand_string(callout_random_local_part)))
- log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand "
- "callout_random_local_part: %s", expand_string_message);
-
- /* Default the connect and overall callout timeouts if not set, and record the
- time we are starting so that we can enforce it. */
-
- if (callout_overall < 0) callout_overall = 4 * callout;
- if (callout_connect < 0) callout_connect = callout;
- callout_start_time = time(NULL);
+return FALSE;
+}
- /* Before doing a real callout, if this is an SMTP connection, flush the SMTP
- output because a callout might take some time. When PIPELINING is active and
- there are many recipients, the total time for doing lots of callouts can add up
- and cause the client to time out. So in this case we forgo the PIPELINING
- optimization. */
- if (smtp_out != NULL && !disable_callout_flush) mac_smtp_fflush();
+/* Write results to callout cache
+*/
+static void
+cache_callout_write(dbdata_callout_cache * dom_rec, const uschar * domain,
+ int done, dbdata_callout_cache_address * addr_rec, uschar * address_key)
+{
+open_db dbblock;
+open_db *dbm_file = NULL;
-/* cutthrough-multi: if a nonfirst rcpt has the same routing as the first,
-and we are holding a cutthrough conn open, we can just append the rcpt to
-that conn for verification purposes (and later delivery also). Simplest
-coding means skipping this whole loop and doing the append separately.
+/* If we get here with done == TRUE, a successful callout happened, and yield
+will be set OK or FAIL according to the response to the RCPT command.
+Otherwise, we looped through the hosts but couldn't complete the business.
+However, there may be domain-specific information to cache in both cases.
-We will need to remember it has been appended so that rcpt-acl tail code
-can do it there for the non-rcpt-verify case. For this we keep an addresscount.
-*/
+The value of the result field in the new_domain record is ccache_unknown if
+there was an error before or with MAIL FROM:, and errno was not zero,
+implying some kind of I/O error. We don't want to write the cache in that case.
+Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
- /* Can we re-use an open cutthrough connection? */
- if ( cutthrough.fd >= 0
- && (options & (vopt_callout_recipsender | vopt_callout_recippmaster))
- == vopt_callout_recipsender
- && !random_local_part
- && !pm_mailfrom
- )
+if (dom_rec->result != ccache_unknown)
+ if (!(dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE, TRUE)))
{
- if (addr->transport == cutthrough.addr.transport)
- for (host = host_list; host; host = host->next)
- if (Ustrcmp(host->address, cutthrough.host.address) == 0)
- {
- int host_af;
- uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
- int port = 25;
-
- deliver_host = host->name;
- deliver_host_address = host->address;
- deliver_host_port = host->port;
- deliver_domain = addr->domain;
- transport_name = addr->transport->name;
-
- host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
-
- if (!smtp_get_interface(tf->interface, host_af, addr, NULL, &interface,
- US"callout") ||
- !smtp_get_port(tf->port, addr, &port, US"callout"))
- log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
- addr->message);
-
- if ( ( interface == cutthrough.interface
- || ( interface
- && cutthrough.interface
- && Ustrcmp(interface, cutthrough.interface) == 0
- ) )
- && port == cutthrough.host.port
- )
- {
- uschar * resp;
+ HDEBUG(D_verify) debug_printf_indent("callout cache: not available\n");
+ }
+ else
+ {
+ (void)dbfn_write(dbm_file, domain, dom_rec,
+ (int)sizeof(dbdata_callout_cache));
+ HDEBUG(D_verify) debug_printf_indent("wrote callout cache domain record for %s:\n"
+ " result=%d postmaster=%d random=%d\n",
+ domain,
+ dom_rec->result,
+ dom_rec->postmaster_result,
+ dom_rec->random_result);
+ }
- /* Match! Send the RCPT TO, append the addr, set done */
- done =
- smtp_write_command(&ctblock, FALSE, "RCPT TO:<%.1000s>\r\n",
- transport_rcpt_address(addr,
- (addr->transport == NULL)? FALSE :
- addr->transport->rcpt_include_affixes)) >= 0 &&
- cutthrough_response('2', &resp) == '2';
+/* If a definite result was obtained for the callout, cache it unless caching
+is disabled. */
- /* This would go horribly wrong if a callout fail was ignored by ACL.
- We punt by abandoning cutthrough on a reject, like the
- first-rcpt does. */
+if (done && addr_rec->result != ccache_unknown)
+ {
+ if (!dbm_file)
+ dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE, TRUE);
+ if (!dbm_file)
+ {
+ HDEBUG(D_verify) debug_printf_indent("no callout cache available\n");
+ }
+ else
+ {
+ (void)dbfn_write(dbm_file, address_key, addr_rec,
+ (int)sizeof(dbdata_callout_cache_address));
+ HDEBUG(D_verify) debug_printf_indent("wrote %s callout cache address record for %s\n",
+ addr_rec->result == ccache_accept ? "positive" : "negative",
+ address_key);
+ }
+ }
- if (done)
- {
- address_item * na = store_get(sizeof(address_item));
- *na = cutthrough.addr;
- cutthrough.addr = *addr;
- cutthrough.addr.host_used = &cutthrough.host;
- cutthrough.addr.next = na;
+if (dbm_file) dbfn_close(dbm_file);
+}
- cutthrough.nrcpt++;
- }
- else
- {
- cancel_cutthrough_connection("recipient rejected");
- if (errno == ETIMEDOUT)
- {
- HDEBUG(D_verify) debug_printf("SMTP timeout\n");
- }
- else if (errno == 0)
- {
- if (*resp == 0)
- Ustrcpy(resp, US"connection dropped");
- addr->message =
- string_sprintf("response to \"%s\" from %s [%s] was: %s",
- big_buffer, host->name, host->address,
- string_printing(resp));
+/* Cutthrough-multi. If the existing cached cutthrough connection matches
+the one we would make for a subsequent recipient, use it. Send the RCPT TO
+and check the result, nonpipelined as it may be wanted immediately for
+recipient-verification.
- addr->user_message =
- string_sprintf("Callout verification failed:\n%s", resp);
+It seems simpler to deal with this case separately from the main callout loop.
+We will need to remember it has sent, or not, so that rcpt-acl tail code
+can do it there for the non-rcpt-verify case. For this we keep an addresscount.
- /* Hard rejection ends the process */
+Return: TRUE for a definitive result for the recipient
+*/
+static int
+cutthrough_multi(address_item * addr, host_item * host_list,
+ transport_feedback * tf, int * yield)
+{
+BOOL done = FALSE;
- if (resp[0] == '5') /* Address rejected */
- {
- yield = FAIL;
- done = TRUE;
- }
- }
- }
- }
- break;
- }
- if (!done)
- cancel_cutthrough_connection("incompatible connection");
- }
+if (addr->transport == cutthrough.addr.transport)
+ for (host_item * host = host_list; host; host = host->next)
+ if (Ustrcmp(host->address, cutthrough.host.address) == 0)
+ {
+ int host_af;
+ uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
+ int port = 25;
- /* Now make connections to the hosts and do real callouts. The list of hosts
- is passed in as an argument. */
+ deliver_host = host->name;
+ deliver_host_address = host->address;
+ deliver_host_port = host->port;
+ deliver_domain = addr->domain;
+ transport_name = addr->transport->name;
- for (host = host_list; host != NULL && !done; host = host->next)
- {
- smtp_inblock inblock;
- smtp_outblock outblock;
- int host_af;
- int port = 25;
- BOOL send_quit = TRUE;
- uschar *active_hostname = smtp_active_hostname;
- BOOL lmtp;
- BOOL smtps;
- BOOL esmtp;
- BOOL suppress_tls = FALSE;
- uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
-#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
- BOOL dane = FALSE;
- BOOL dane_required;
- dns_answer tlsa_dnsa;
-#endif
- uschar inbuffer[4096];
- uschar outbuffer[1024];
- uschar responsebuffer[4096];
+ host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
- clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
- clearflag(addr, af_verify_nsfail); /* null sender callout flag */
+ if ( !smtp_get_interface(tf->interface, host_af, addr, &interface,
+ US"callout")
+ || !smtp_get_port(tf->port, addr, &port, US"callout")
+ )
+ log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
+ addr->message);
- /* Skip this host if we don't have an IP address for it. */
+ smtp_port_for_connect(host, port);
- if (host->address == NULL)
- {
- DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
- host->name);
- continue;
- }
+ if ( ( interface == cutthrough.interface
+ || ( interface
+ && cutthrough.interface
+ && Ustrcmp(interface, cutthrough.interface) == 0
+ ) )
+ && host->port == cutthrough.host.port
+ )
+ {
+ uschar * resp = NULL;
- /* Check the overall callout timeout */
+ /* Match! Send the RCPT TO, set done from the response */
+ done =
+ smtp_write_command(&ctctx, SCMD_FLUSH, "RCPT TO:<%.1000s>\r\n",
+ transport_rcpt_address(addr,
+ addr->transport->rcpt_include_affixes)) >= 0
+ && cutthrough_response(&cutthrough.cctx, '2', &resp,
+ CUTTHROUGH_DATA_TIMEOUT) == '2';
- if (time(NULL) - callout_start_time >= callout_overall)
- {
- HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
- break;
- }
+ /* This would go horribly wrong if a callout fail was ignored by ACL.
+ We punt by abandoning cutthrough on a reject, like the
+ first-rcpt does. */
- /* Set IPv4 or IPv6 */
+ if (done)
+ {
+ address_item * na = store_get(sizeof(address_item), GET_UNTAINTED);
+ *na = cutthrough.addr;
+ cutthrough.addr = *addr;
+ cutthrough.addr.host_used = &cutthrough.host;
+ cutthrough.addr.next = na;
- host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
+ cutthrough.nrcpt++;
+ }
+ else
+ {
+ cancel_cutthrough_connection(TRUE, US"recipient rejected");
+ if (!resp || errno == ETIMEDOUT)
+ {
+ HDEBUG(D_verify) debug_printf("SMTP timeout\n");
+ }
+ else if (errno == 0)
+ {
+ if (*resp == 0)
+ Ustrcpy(resp, US"connection dropped");
- /* Expand and interpret the interface and port strings. The latter will not
- be used if there is a host-specific port (e.g. from a manualroute router).
- This has to be delayed till now, because they may expand differently for
- different hosts. If there's a failure, log it, but carry on with the
- defaults. */
+ addr->message =
+ string_sprintf("response to \"%s\" was: %s",
+ big_buffer, string_printing(resp));
- deliver_host = host->name;
- deliver_host_address = host->address;
- deliver_host_port = host->port;
- deliver_domain = addr->domain;
- transport_name = addr->transport->name;
+ addr->user_message =
+ string_sprintf("Callout verification failed:\n%s", resp);
- if ( !smtp_get_interface(tf->interface, host_af, addr, NULL, &interface,
- US"callout")
- || !smtp_get_port(tf->port, addr, &port, US"callout")
- )
- log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
- addr->message);
+ /* Hard rejection ends the process */
- /* Set HELO string according to the protocol */
- lmtp= Ustrcmp(tf->protocol, "lmtp") == 0;
- smtps= Ustrcmp(tf->protocol, "smtps") == 0;
+ if (resp[0] == '5') /* Address rejected */
+ {
+ *yield = FAIL;
+ done = TRUE;
+ }
+ }
+ }
+ }
+ break; /* host_list */
+ }
+if (!done)
+ cancel_cutthrough_connection(TRUE, US"incompatible connection");
+return done;
+}
- HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
- /* Set up the buffer for reading SMTP response packets. */
- inblock.buffer = inbuffer;
- inblock.buffersize = sizeof(inbuffer);
- inblock.ptr = inbuffer;
- inblock.ptrend = inbuffer;
+/* A rcpt callout, or cached record of one, verified the address.
+Set $domain_data and $local_part_data to detainted versions.
+*/
+static void
+callout_verified_rcpt(const address_item * addr)
+{
+address_item a = {.address = addr->address};
+if (deliver_split_address(&a) != OK) return;
+deliver_localpart_data = string_copy_taint(a.local_part, GET_UNTAINTED);
+deliver_domain_data = string_copy_taint(a.domain, GET_UNTAINTED);
+}
- /* Set up the buffer for holding SMTP commands while pipelining */
- outblock.buffer = outbuffer;
- outblock.buffersize = sizeof(outbuffer);
- outblock.ptr = outbuffer;
- outblock.cmd_count = 0;
- outblock.authenticating = FALSE;
+/*************************************************
+* Do callout verification for an address *
+*************************************************/
- /* Connect to the host; on failure, just loop for the next one, but we
- set the error for the last one. Use the callout_connect timeout. */
+/* This function is called from verify_address() when the address has routed to
+a host list, and a callout has been requested. Callouts are expensive; that is
+why a cache is used to improve the efficiency.
- tls_retry_connection:
+Arguments:
+ addr the address that's been routed
+ host_list the list of hosts to try
+ tf the transport feedback block
- /* Reset the parameters of a TLS session */
- tls_out.cipher = tls_out.peerdn = tls_out.peercert = NULL;
+ ifstring "interface" option from transport, or NULL
+ portstring "port" option from transport, or NULL
+ protocolstring "protocol" option from transport, or NULL
+ callout the per-command callout timeout
+ callout_overall the overall callout timeout (if < 0 use 4*callout)
+ callout_connect the callout connection timeout (if < 0 use callout)
+ options the verification options - these bits are used:
+ vopt_is_recipient => this is a recipient address
+ vopt_callout_no_cache => don't use callout cache
+ vopt_callout_fullpm => if postmaster check, do full one
+ vopt_callout_random => do the "random" thing
+ vopt_callout_recipsender => use real sender for recipient
+ vopt_callout_recippmaster => use postmaster for recipient
+ vopt_callout_hold => lazy close connection
+ se_mailfrom MAIL FROM address for sender verify; NULL => ""
+ pm_mailfrom if non-NULL, do the postmaster check with this sender
- inblock.sock = outblock.sock =
- smtp_connect(host, host_af, port, interface, callout_connect,
- addr->transport);
- if (inblock.sock < 0)
- {
- addr->message = string_sprintf("could not connect to %s [%s]: %s",
- host->name, host->address, strerror(errno));
- transport_name = NULL;
- deliver_host = deliver_host_address = NULL;
- deliver_domain = save_deliver_domain;
- continue;
- }
+Returns: OK/FAIL/DEFER
+*/
-#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
- {
- int rc;
+static int
+do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
+ int callout, int callout_overall, int callout_connect, int options,
+ uschar *se_mailfrom, uschar *pm_mailfrom)
+{
+int yield = OK;
+int old_domain_cache_result = ccache_accept;
+BOOL done = FALSE;
+uschar *address_key;
+uschar *from_address;
+uschar *random_local_part = NULL;
+const uschar *save_deliver_domain = deliver_domain;
+uschar **failure_ptr = options & vopt_is_recipient
+ ? &recipient_verify_failure : &sender_verify_failure;
+dbdata_callout_cache new_domain_record;
+dbdata_callout_cache_address new_address_record;
+time_t callout_start_time;
- tls_out.dane_verified = FALSE;
- tls_out.tlsa_usage = 0;
+new_domain_record.result = ccache_unknown;
+new_domain_record.postmaster_result = ccache_unknown;
+new_domain_record.random_result = ccache_unknown;
- dane_required =
- verify_check_given_host(&ob->hosts_require_dane, host) == OK;
+memset(&new_address_record, 0, sizeof(new_address_record));
- if (host->dnssec == DS_YES)
- {
- if( ( dane_required
- || verify_check_given_host(&ob->hosts_try_dane, host) == OK
- )
- && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
- )
- return rc;
- }
- else if (dane_required)
- {
- log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
- return FAIL;
- }
+/* For a recipient callout, the key used for the address cache record must
+include the sender address if we are using the real sender in the callout,
+because that may influence the result of the callout. */
- if (dane)
- ob->tls_tempfail_tryclear = FALSE;
- }
-#endif /*DANE*/
+if (options & vopt_is_recipient)
+ if (options & vopt_callout_recipsender)
+ {
+ from_address = sender_address;
+ address_key = string_sprintf("%s/<%s>", addr->address, sender_address);
+ if (cutthrough.delivery) options |= vopt_callout_no_cache;
+ }
+ else if (options & vopt_callout_recippmaster)
+ {
+ from_address = string_sprintf("postmaster@%s", qualify_domain_sender);
+ address_key = string_sprintf("%s/<postmaster@%s>", addr->address,
+ qualify_domain_sender);
+ }
+ else
+ {
+ from_address = US"";
+ address_key = addr->address;
+ }
- /* Expand the helo_data string to find the host name to use. */
+/* For a sender callout, we must adjust the key if the mailfrom address is not
+empty. */
- if (tf->helo_data != NULL)
- {
- uschar *s = expand_string(tf->helo_data);
- if (s == NULL)
- log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: failed to expand transport's "
- "helo_data value for callout: %s", addr->address,
- expand_string_message);
- else active_hostname = s;
- }
+else
+ {
+ from_address = se_mailfrom ? se_mailfrom : US"";
+ address_key = *from_address
+ ? string_sprintf("%s/<%s>", addr->address, from_address) : addr->address;
+ }
- /* Wait for initial response, and send HELO. The smtp_write_command()
- function leaves its command in big_buffer. This is used in error responses.
- Initialize it in case the connection is rejected. */
+if (cached_callout_lookup(addr, address_key, from_address,
+ &options, &pm_mailfrom, &yield, failure_ptr,
+ &new_domain_record, &old_domain_cache_result))
+ {
+ cancel_cutthrough_connection(TRUE, US"cache-hit");
+ goto END_CALLOUT;
+ }
- Ustrcpy(big_buffer, "initial connection");
+if (!addr->transport)
+ {
+ HDEBUG(D_verify) debug_printf("cannot callout via null transport\n");
+ }
- /* Unless ssl-on-connect, wait for the initial greeting */
- smtps_redo_greeting:
+else if (Ustrcmp(addr->transport->driver_name, "smtp") != 0)
+ log_write(0, LOG_MAIN|LOG_PANIC|LOG_CONFIG_FOR, "callout transport '%s': %s is non-smtp",
+ addr->transport->name, addr->transport->driver_name);
+else
+ {
+ smtp_transport_options_block *ob =
+ (smtp_transport_options_block *)addr->transport->options_block;
+ smtp_context * sx = NULL;
-#ifdef SUPPORT_TLS
- if (!smtps || (smtps && tls_out.active >= 0))
-#endif
- {
- if (!(done= smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout)))
- goto RESPONSE_FAILED;
-
-#ifdef EXPERIMENTAL_EVENT
- lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
- : host->dnssec==DS_NO ? US"no" : NULL;
- if (event_raise(addr->transport->event_action,
- US"smtp:connect", responsebuffer))
- {
- lookup_dnssec_authenticated = NULL;
- /* Logging? Debug? */
- goto RESPONSE_FAILED;
- }
- lookup_dnssec_authenticated = NULL;
-#endif
- }
+ /* The information wasn't available in the cache, so we have to do a real
+ callout and save the result in the cache for next time, unless no_cache is set,
+ or unless we have a previously cached negative random result. If we are to test
+ with a random local part, ensure that such a local part is available. If not,
+ log the fact, but carry on without randomising. */
- /* Not worth checking greeting line for ESMTP support */
- if (!(esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK))
- DEBUG(D_transport)
- debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
+ if (options & vopt_callout_random && callout_random_local_part)
+ if (!(random_local_part = expand_string(callout_random_local_part)))
+ log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand "
+ "callout_random_local_part: %s", expand_string_message);
- tls_redo_helo:
+ /* Compile regex' used by client-side smtp */
-#ifdef SUPPORT_TLS
- if (smtps && tls_out.active < 0) /* ssl-on-connect, first pass */
- {
- tls_offered = TRUE;
- ob->tls_tempfail_tryclear = FALSE;
- }
- else /* all other cases */
-#endif
+ smtp_deliver_init();
- { esmtp_retry:
+ /* Default the connect and overall callout timeouts if not set, and record the
+ time we are starting so that we can enforce it. */
- if (!(done= smtp_write_command(&outblock, FALSE, "%s %s\r\n",
- !esmtp? "HELO" : lmtp? "LHLO" : "EHLO", active_hostname) >= 0))
- goto SEND_FAILED;
- if (!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), '2', callout))
- {
- if (errno != 0 || responsebuffer[0] == 0 || lmtp || !esmtp || tls_out.active >= 0)
- {
- done= FALSE;
- goto RESPONSE_FAILED;
- }
-#ifdef SUPPORT_TLS
- tls_offered = FALSE;
-#endif
- esmtp = FALSE;
- goto esmtp_retry; /* fallback to HELO */
- }
+ if (callout_overall < 0) callout_overall = 4 * callout;
+ if (callout_connect < 0) callout_connect = callout;
+ callout_start_time = time(NULL);
- /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
-#ifdef SUPPORT_TLS
- if (esmtp && !suppress_tls && tls_out.active < 0)
- {
- if (regex_STARTTLS == NULL) regex_STARTTLS =
- regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
+ /* Before doing a real callout, if this is an SMTP connection, flush the SMTP
+ output because a callout might take some time. When PIPELINING is active and
+ there are many recipients, the total time for doing lots of callouts can add up
+ and cause the client to time out. So in this case we forgo the PIPELINING
+ optimization. */
- tls_offered = pcre_exec(regex_STARTTLS, NULL, CS responsebuffer,
- Ustrlen(responsebuffer), 0, PCRE_EOPT, NULL, 0) >= 0;
- }
- else
- tls_offered = FALSE;
-#endif
- }
+ if (smtp_out && !f.disable_callout_flush) mac_smtp_fflush();
- /* If TLS is available on this connection attempt to
- start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
- send another EHLO - the server may give a different answer in secure mode. We
- use a separate buffer for reading the response to STARTTLS so that if it is
- negative, the original EHLO data is available for subsequent analysis, should
- the client not be required to use TLS. If the response is bad, copy the buffer
- for error analysis. */
-
-#ifdef SUPPORT_TLS
- if ( tls_offered
- && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK
- && verify_check_given_host(&ob->hosts_verify_avoid_tls, host) != OK
- )
- {
- uschar buffer2[4096];
- if ( !smtps
- && !(done= smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") >= 0))
- goto SEND_FAILED;
-
- /* If there is an I/O error, transmission of this message is deferred. If
- there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
- false, we also defer. However, if there is a temporary rejection of STARTTLS
- and tls_tempfail_tryclear is true, or if there is an outright rejection of
- STARTTLS, we carry on. This means we will try to send the message in clear,
- unless the host is in hosts_require_tls (tested below). */
-
- if (!smtps && !smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
- ob->command_timeout))
- {
- if (errno != 0 || buffer2[0] == 0 ||
- (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
- {
- Ustrncpy(responsebuffer, buffer2, sizeof(responsebuffer));
- done= FALSE;
- goto RESPONSE_FAILED;
- }
- }
+ clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
+ clearflag(addr, af_verify_nsfail); /* null sender callout flag */
- /* STARTTLS accepted or ssl-on-connect: try to negotiate a TLS session. */
- else
- {
- int oldtimeout = ob->command_timeout;
- int rc;
-
- tls_negotiate:
- ob->command_timeout = callout;
- rc = tls_client_start(inblock.sock, host, addr, addr->transport
-# ifdef EXPERIMENTAL_DANE
- , dane ? &tlsa_dnsa : NULL
-# endif
- );
- ob->command_timeout = oldtimeout;
-
- /* TLS negotiation failed; give an error. Try in clear on a new
- connection, if the options permit it for this host. */
- if (rc != OK)
- {
- if (rc == DEFER)
- {
- (void)close(inblock.sock);
-# ifdef EXPERIMENTAL_EVENT
- (void) event_raise(addr->transport->event_action,
- US"tcp:close", NULL);
-# endif
-# ifdef EXPERIMENTAL_DANE
- if (dane)
- {
- if (!dane_required)
- {
- log_write(0, LOG_MAIN, "DANE attempt failed;"
- " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
- host->name, host->address);
- dane = FALSE;
- goto tls_negotiate;
- }
- }
- else
-# endif
- if ( ob->tls_tempfail_tryclear
- && !smtps
- && verify_check_given_host(&ob->hosts_require_tls, host) != OK
- )
- {
- log_write(0, LOG_MAIN, "TLS session failure:"
- " delivering unencrypted to %s [%s] (not in hosts_require_tls)",
- host->name, host->address);
- suppress_tls = TRUE;
- goto tls_retry_connection;
- }
- }
+/* cutthrough-multi: if a nonfirst rcpt has the same routing as the first,
+and we are holding a cutthrough conn open, we can just append the rcpt to
+that conn for verification purposes (and later delivery also). Simplest
+coding means skipping this whole loop and doing the append separately. */
- /*save_errno = ERRNO_TLSFAILURE;*/
- /*message = US"failure while setting up TLS session";*/
- send_quit = FALSE;
- done= FALSE;
- goto TLS_FAILED;
- }
+ /* Can we re-use an open cutthrough connection? */
+ if ( cutthrough.cctx.sock >= 0
+ && (options & (vopt_callout_recipsender | vopt_callout_recippmaster))
+ == vopt_callout_recipsender
+ && !random_local_part
+ && !pm_mailfrom
+ )
+ done = cutthrough_multi(addr, host_list, tf, &yield);
- /* TLS session is set up. Copy info for logging. */
- addr->cipher = tls_out.cipher;
- addr->peerdn = tls_out.peerdn;
+ /* If we did not use a cached connection, make connections to the hosts
+ and do real callouts. The list of hosts is passed in as an argument. */
- /* For SMTPS we need to wait for the initial OK response, then do HELO. */
- if (smtps)
- goto smtps_redo_greeting;
+ for (host_item * host = host_list; host && !done; host = host->next)
+ {
+ int host_af;
+ int port = 25;
+ uschar * interface = NULL; /* Outgoing interface to use; NULL => any */
- /* For STARTTLS we need to redo EHLO */
- goto tls_redo_helo;
- }
+ if (!host->address)
+ {
+ DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
+ host->name);
+ continue;
}
- /* If the host is required to use a secure channel, ensure that we have one. */
- if (tls_out.active < 0)
- if (
-# ifdef EXPERIMENTAL_DANE
- dane ||
-# endif
- verify_check_given_host(&ob->hosts_require_tls, host) == OK
- )
- {
- /*save_errno = ERRNO_TLSREQUIRED;*/
- log_write(0, LOG_MAIN,
- "H=%s [%s]: a TLS session is required for this host, but %s",
- host->name, host->address,
- tls_offered ? "an attempt to start TLS failed"
- : "the server did not offer TLS support");
- done= FALSE;
- goto TLS_FAILED;
- }
+ /* Check the overall callout timeout */
-#endif /*SUPPORT_TLS*/
+ if (time(NULL) - callout_start_time >= callout_overall)
+ {
+ HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
+ break;
+ }
- done = TRUE; /* so far so good; have response to HELO */
+ /* Set IPv4 or IPv6 */
- /*XXX the EHLO response would be analyzed here for IGNOREQUOTA, SIZE, PIPELINING */
+ host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
- /* For now, transport_filter by cutthrough-delivery is not supported */
- /* Need proper integration with the proper transport mechanism. */
- if (cutthrough.delivery)
- {
- if (addr->transport->filter_command)
- {
- cutthrough.delivery = FALSE;
- HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of transport filter\n");
- }
-#ifndef DISABLE_DKIM
- if (ob->dkim_domain)
- {
- cutthrough.delivery = FALSE;
- HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
- }
-#endif
- }
+ /* Expand and interpret the interface and port strings. The latter will not
+ be used if there is a host-specific port (e.g. from a manualroute router).
+ This has to be delayed till now, because they may expand differently for
+ different hosts. If there's a failure, log it, but carry on with the
+ defaults. */
- SEND_FAILED:
- RESPONSE_FAILED:
- TLS_FAILED:
- ;
- /* Clear down of the TLS, SMTP and TCP layers on error is handled below. */
+ deliver_host = host->name;
+ deliver_host_address = host->address;
+ deliver_host_port = host->port;
+ deliver_domain = addr->domain;
+ transport_name = addr->transport->name;
- /* Failure to accept HELO is cached; this blocks the whole domain for all
- senders. I/O errors and defer responses are not cached. */
+ if ( !smtp_get_interface(tf->interface, host_af, addr, &interface,
+ US"callout")
+ || !smtp_get_port(tf->port, addr, &port, US"callout")
+ )
+ log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
+ addr->message);
- if (!done)
+ if (!sx) sx = store_get(sizeof(*sx), GET_TAINTED); /* tainted buffers */
+ memset(sx, 0, sizeof(*sx));
+
+ sx->addrlist = sx->first_addr = addr;
+ sx->conn_args.host = host;
+ sx->conn_args.host_af = host_af,
+ sx->port = port;
+ sx->conn_args.interface = interface;
+ sx->helo_data = tf->helo_data;
+ sx->conn_args.tblock = addr->transport;
+ sx->conn_args.sock = -1;
+ sx->verify = TRUE;
+
+tls_retry_connection:
+ /* Set the address state so that errors are recorded in it */
+
+ addr->transport_return = PENDING_DEFER;
+ ob->connect_timeout = callout_connect;
+ ob->command_timeout = callout;
+
+ /* Get the channel set up ready for a message (MAIL FROM being the next
+ SMTP command to send. If we tried TLS but it failed, try again without
+ if permitted */
+
+ yield = smtp_setup_conn(sx, FALSE);
+#ifndef DISABLE_TLS
+ if ( yield == DEFER
+ && addr->basic_errno == ERRNO_TLSFAILURE
+ && ob->tls_tempfail_tryclear
+ && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
+ )
{
- *failure_ptr = US"mail"; /* At or before MAIL */
- if (errno == 0 && responsebuffer[0] == '5')
- {
- setflag(addr, af_verify_nsfail);
- new_domain_record.result = ccache_reject;
- }
+ log_write(0, LOG_MAIN,
+ "%s: callout unencrypted to %s [%s] (not in hosts_require_tls)",
+ addr->message, host->name, host->address);
+ addr->transport_return = PENDING_DEFER;
+ yield = smtp_setup_conn(sx, TRUE);
}
+#endif
+ if (yield != OK)
+ {
+ errno = addr->basic_errno;
+ transport_name = NULL;
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
- /* If we haven't authenticated, but are required to, give up. */
- /* Try to AUTH */
+ /* Failure to accept HELO is cached; this blocks the whole domain for all
+ senders. I/O errors and defer responses are not cached. */
- else done = smtp_auth(responsebuffer, sizeof(responsebuffer),
- addr, host, ob, esmtp, &inblock, &outblock) == OK &&
+ if (yield == FAIL && (errno == 0 || errno == ERRNO_SMTPCLOSED))
+ {
+ setflag(addr, af_verify_nsfail);
+ new_domain_record.result = ccache_reject;
+ done = TRUE;
+ }
+ else
+ done = FALSE;
+ goto no_conn;
+ }
- /* Copy AUTH info for logging */
- ( (addr->authenticator = client_authenticator),
- (addr->auth_id = client_authenticated_id),
+ /* If we needed to authenticate, smtp_setup_conn() did that. Copy
+ the AUTH info for logging */
- /* Build a mail-AUTH string (re-using responsebuffer for convenience */
- !smtp_mail_auth_str(responsebuffer, sizeof(responsebuffer), addr, ob)
- ) &&
+ addr->authenticator = client_authenticator;
+ addr->auth_id = client_authenticated_id;
- ( (addr->auth_sndr = client_authenticated_sender),
+ sx->from_addr = from_address;
+ sx->first_addr = sx->sync_addr = addr;
+ sx->ok = FALSE; /*XXX these 3 last might not be needed for verify? */
+ sx->send_rset = TRUE;
+ sx->completed_addr = FALSE;
- /* Send the MAIL command */
- (smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>%s\r\n",
- from_address, responsebuffer) >= 0)
- ) &&
+ new_domain_record.result = old_domain_cache_result == ccache_reject_mfnull
+ ? ccache_reject_mfnull : ccache_accept;
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
+ /* Do the random local part check first. Temporarily replace the recipient
+ with the "random" value */
- deliver_host = deliver_host_address = NULL;
- deliver_domain = save_deliver_domain;
+ if (random_local_part)
+ {
+ uschar * main_address = addr->address;
+ const uschar * rcpt_domain = addr->domain;
+
+#ifdef SUPPORT_I18N
+ uschar * errstr = NULL;
+ if ( testflag(addr, af_utf8_downcvt)
+ && (rcpt_domain = string_domain_utf8_to_alabel(rcpt_domain,
+ &errstr), errstr)
+ )
+ {
+ addr->message = errstr;
+ errno = ERRNO_EXPANDFAIL;
+ setflag(addr, af_verify_nsfail);
+ done = FALSE;
+ rcpt_domain = US""; /*XXX errorhandling! */
+ }
+#endif
- /* If the host does not accept MAIL FROM:<>, arrange to cache this
- information, but again, don't record anything for an I/O error or a defer. Do
- not cache rejections of MAIL when a non-empty sender has been used, because
- that blocks the whole domain for all senders. */
+ /* This would be ok for 1st rcpt of a cutthrough (the case handled here;
+ subsequents are done in cutthrough_multi()), but no way to
+ handle a subsequent because of the RSET vaporising the MAIL FROM.
+ So refuse to support any. Most cutthrough use will not involve
+ random_local_part, so no loss. */
+ cancel_cutthrough_connection(TRUE, US"random-recipient");
+
+ addr->address = string_sprintf("%s@%.1000s",
+ random_local_part, rcpt_domain);
+ done = FALSE;
+
+ /* If accepted, we aren't going to do any further tests below.
+ Otherwise, cache a real negative response, and get back to the right
+ state to send RCPT. Unless there's some problem such as a dropped
+ connection, we expect to succeed, because the commands succeeded above.
+ However, some servers drop the connection after responding to an
+ invalid recipient, so on (any) error we drop and remake the connection.
+ XXX We don't care about that for postmaster_full. Should we?
+
+ XXX could we add another flag to the context, and have the common
+ code emit the RSET too? Even pipelined after the RCPT...
+ Then the main-verify call could use it if there's to be a subsequent
+ postmaster-verify.
+ The sync_responses() would need to be taught about it and we'd
+ need another return code filtering out to here.
+
+ Avoid using a SIZE option on the MAIL for all random-rcpt checks.
+ */
- if (!done)
- {
- *failure_ptr = US"mail"; /* At or before MAIL */
- if (errno == 0 && responsebuffer[0] == '5')
- {
- setflag(addr, af_verify_nsfail);
- if (from_address[0] == 0)
- new_domain_record.result = ccache_reject_mfnull;
- }
- }
+ sx->avoid_option = OPTION_SIZE;
- /* Otherwise, proceed to check a "random" address (if required), then the
- given address, and the postmaster address (if required). Between each check,
- issue RSET, because some servers accept only one recipient after MAIL
- FROM:<>.
+ /* Remember when we last did a random test */
+ new_domain_record.random_stamp = time(NULL);
- Before doing this, set the result in the domain cache record to "accept",
- unless its previous value was ccache_reject_mfnull. In that case, the domain
- rejects MAIL FROM:<> and we want to continue to remember that. When that is
- the case, we have got here only in the case of a recipient verification with
- a non-null sender. */
+ if (smtp_write_mail_and_rcpt_cmds(sx, &yield) == 0)
+ switch(addr->transport_return)
+ {
+ case PENDING_OK: /* random was accepted, unfortunately */
+ new_domain_record.random_result = ccache_accept;
+ yield = OK; /* Only usable verify result we can return */
+ done = TRUE;
+ *failure_ptr = US"random";
+ goto no_conn;
+ case FAIL: /* rejected: the preferred result */
+ new_domain_record.random_result = ccache_reject;
+ sx->avoid_option = 0;
+
+ /* Between each check, issue RSET, because some servers accept only
+ one recipient after MAIL FROM:<>.
+ XXX We don't care about that for postmaster_full. Should we? */
+
+ if ((done =
+ smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0 &&
+ smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', callout)))
+ break;
- else
- {
- new_domain_record.result =
- (old_domain_cache_result == ccache_reject_mfnull)?
- ccache_reject_mfnull: ccache_accept;
+ HDEBUG(D_acl|D_v)
+ debug_printf_indent("problem after random/rset/mfrom; reopen conn\n");
+ random_local_part = NULL;
+#ifndef DISABLE_TLS
+ tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
+#endif
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
+ (void)close(sx->cctx.sock);
+ sx->cctx.sock = -1;
+#ifndef DISABLE_EVENT
+ (void) event_raise(addr->transport->event_action,
+ US"tcp:close", NULL, NULL);
+#endif
+ addr->address = main_address;
+ addr->transport_return = PENDING_DEFER;
+ sx->first_addr = sx->sync_addr = addr;
+ sx->ok = FALSE;
+ sx->send_rset = TRUE;
+ sx->completed_addr = FALSE;
+ goto tls_retry_connection;
+ case DEFER: /* 4xx response to random */
+ break; /* Just to be clear. ccache_unknown, !done. */
+ }
- /* Do the random local part check first */
+ /* Re-setup for main verify, or for the error message when failing */
+ addr->address = main_address;
+ addr->transport_return = PENDING_DEFER;
+ sx->first_addr = sx->sync_addr = addr;
+ sx->ok = FALSE;
+ sx->send_rset = TRUE;
+ sx->completed_addr = FALSE;
+ }
+ else
+ done = TRUE;
- if (random_local_part != NULL)
- {
- uschar randombuffer[1024];
- BOOL random_ok =
- smtp_write_command(&outblock, FALSE,
- "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part,
- addr->domain) >= 0 &&
- smtp_read_response(&inblock, randombuffer,
- sizeof(randombuffer), '2', callout);
+ /* Main verify. For rcpt-verify use SIZE if we know it and we're not cacheing;
+ for sndr-verify never use it. */
- /* Remember when we last did a random test */
+ if (done)
+ {
+ if (!(options & vopt_is_recipient && options & vopt_callout_no_cache))
+ sx->avoid_option = OPTION_SIZE;
- new_domain_record.random_stamp = time(NULL);
+ done = FALSE;
+ switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
+ {
+ case 0: switch(addr->transport_return) /* ok so far */
+ {
+ case PENDING_OK: done = TRUE;
+ new_address_record.result = ccache_accept;
+ break;
+ case FAIL: done = TRUE;
+ yield = FAIL;
+ *failure_ptr = US"recipient";
+ new_address_record.result = ccache_reject;
+ break;
+ default: break;
+ }
+ break;
+
+ case -1: /* MAIL response error */
+ *failure_ptr = US"mail";
+ if (errno == 0 && sx->buffer[0] == '5')
+ {
+ setflag(addr, af_verify_nsfail);
+ if (from_address[0] == 0)
+ new_domain_record.result = ccache_reject_mfnull;
+ }
+ break;
+ /* non-MAIL read i/o error */
+ /* non-MAIL response timeout */
+ /* internal error; channel still usable */
+ default: break; /* transmit failed */
+ }
+ }
- /* If accepted, we aren't going to do any further tests below. */
+ addr->auth_sndr = client_authenticated_sender;
- if (random_ok)
- new_domain_record.random_result = ccache_accept;
+ deliver_host = deliver_host_address = NULL;
+ deliver_domain = save_deliver_domain;
- /* Otherwise, cache a real negative response, and get back to the right
- state to send RCPT. Unless there's some problem such as a dropped
- connection, we expect to succeed, because the commands succeeded above.
- However, some servers drop the connection after responding to an
- invalid recipient, so on (any) error we drop and remake the connection.
- */
+ /* Do postmaster check if requested; if a full check is required, we
+ check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
- else if (errno == 0)
- {
- /* This would be ok for 1st rcpt a cutthrough, but no way to
- handle a subsequent. So refuse to support any */
- cancel_cutthrough_connection("random-recipient");
+ if (done && pm_mailfrom)
+ {
+ /* Could possibly shift before main verify, just above, and be ok
+ for cutthrough. But no way to handle a subsequent rcpt, so just
+ refuse any */
+ cancel_cutthrough_connection(TRUE, US"postmaster verify");
+ HDEBUG(D_acl|D_v) debug_printf_indent("Cutthrough cancelled by presence of postmaster verify\n");
- if (randombuffer[0] == '5')
- new_domain_record.random_result = ccache_reject;
+ done = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0
+ && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', callout);
- done =
- smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout) &&
+ if (done)
+ {
+ uschar * main_address = addr->address;
- smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n",
- from_address) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
+ /*XXX oops, affixes */
+ addr->address = string_sprintf("postmaster@%.1000s", addr->domain);
+ addr->transport_return = PENDING_DEFER;
- if (!done)
- {
- HDEBUG(D_acl|D_v)
- debug_printf("problem after random/rset/mfrom; reopen conn\n");
- random_local_part = NULL;
-#ifdef SUPPORT_TLS
- tls_close(FALSE, TRUE);
-#endif
- (void)close(inblock.sock);
-#ifdef EXPERIMENTAL_EVENT
- (void) event_raise(addr->transport->event_action,
- US"tcp:close", NULL);
-#endif
- goto tls_retry_connection;
- }
- }
- else done = FALSE; /* Some timeout/connection problem */
- } /* Random check */
+ sx->from_addr = pm_mailfrom;
+ sx->first_addr = sx->sync_addr = addr;
+ sx->ok = FALSE;
+ sx->send_rset = TRUE;
+ sx->completed_addr = FALSE;
+ sx->avoid_option = OPTION_SIZE;
- /* If the host is accepting all local parts, as determined by the "random"
- check, we don't need to waste time doing any further checking. */
+ if( smtp_write_mail_and_rcpt_cmds(sx, &yield) == 0
+ && addr->transport_return == PENDING_OK
+ )
+ done = TRUE;
+ else
+ done = (options & vopt_callout_fullpm) != 0
+ && smtp_write_command(sx, SCMD_FLUSH,
+ "RCPT TO:<postmaster>\r\n") >= 0
+ && smtp_read_response(sx, sx->buffer,
+ sizeof(sx->buffer), '2', callout);
- if (new_domain_record.random_result != ccache_accept && done)
- {
- /* Get the rcpt_include_affixes flag from the transport if there is one,
- but assume FALSE if there is not. */
-
- done =
- smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
- transport_rcpt_address(addr,
- (addr->transport == NULL)? FALSE :
- addr->transport->rcpt_include_affixes)) >= 0 &&
- smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
- '2', callout);
-
- if (done)
- new_address_record.result = ccache_accept;
- else if (errno == 0 && responsebuffer[0] == '5')
- {
- *failure_ptr = US"recipient";
- new_address_record.result = ccache_reject;
- }
+ /* Sort out the cache record */
- /* Do postmaster check if requested; if a full check is required, we
- check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
+ new_domain_record.postmaster_stamp = time(NULL);
- if (done && pm_mailfrom != NULL)
- {
- /* Could possibly shift before main verify, just above, and be ok
- for cutthrough. But no way to handle a subsequent rcpt, so just
- refuse any */
- cancel_cutthrough_connection("postmaster verify");
- HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of postmaster verify\n");
-
- done =
- smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout) &&
-
- smtp_write_command(&outblock, FALSE,
- "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout) &&
-
- /* First try using the current domain */
-
- ((
- smtp_write_command(&outblock, FALSE,
- "RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout)
- )
-
- ||
-
- /* If that doesn't work, and a full check is requested,
- try without the domain. */
-
- (
- (options & vopt_callout_fullpm) != 0 &&
- smtp_write_command(&outblock, FALSE,
- "RCPT TO:<postmaster>\r\n") >= 0 &&
- smtp_read_response(&inblock, responsebuffer,
- sizeof(responsebuffer), '2', callout)
- ));
-
- /* Sort out the cache record */
-
- new_domain_record.postmaster_stamp = time(NULL);
-
- if (done)
- new_domain_record.postmaster_result = ccache_accept;
- else if (errno == 0 && responsebuffer[0] == '5')
- {
- *failure_ptr = US"postmaster";
- setflag(addr, af_verify_pmfail);
- new_domain_record.postmaster_result = ccache_reject;
- }
- }
- } /* Random not accepted */
- } /* MAIL FROM: accepted */
+ if (done)
+ new_domain_record.postmaster_result = ccache_accept;
+ else if (errno == 0 && sx->buffer[0] == '5')
+ {
+ *failure_ptr = US"postmaster";
+ setflag(addr, af_verify_pmfail);
+ new_domain_record.postmaster_result = ccache_reject;
+ }
+ addr->address = main_address;
+ }
+ }
/* For any failure of the main check, other than a negative response, we just
close the connection and carry on. We can identify a negative response by the
fact that errno is zero. For I/O errors it will be non-zero
don't give the IP address because this may be an internal host whose identity
is not to be widely broadcast. */
- if (!done)
+no_conn:
+ switch(errno)
{
- if (errno == ETIMEDOUT)
- {
- HDEBUG(D_verify) debug_printf("SMTP timeout\n");
- send_quit = FALSE;
- }
- else if (errno == 0)
- {
- if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped");
+ case ETIMEDOUT:
+ HDEBUG(D_verify) debug_printf("SMTP timeout\n");
+ sx->send_quit = FALSE;
+ break;
- addr->message =
- string_sprintf("response to \"%s\" from %s [%s] was: %s",
- big_buffer, host->name, host->address,
- string_printing(responsebuffer));
+#ifdef SUPPORT_I18N
+ case ERRNO_UTF8_FWD:
+ {
+ extern int acl_where; /* src/acl.c */
+ errno = 0;
+ addr->message = US"response to \"EHLO\" did not include SMTPUTF8";
+ addr->user_message = acl_where == ACL_WHERE_RCPT
+ ? US"533 no support for internationalised mailbox name"
+ : US"550 mailbox unavailable";
+ yield = FAIL;
+ done = TRUE;
+ }
+ break;
+#endif
+ case ECONNREFUSED:
+ sx->send_quit = FALSE;
+ break;
+
+ case 0:
+ if (*sx->buffer == 0) Ustrcpy(sx->buffer, US"connection dropped");
- addr->user_message = is_recipient?
- string_sprintf("Callout verification failed:\n%s", responsebuffer)
- :
- string_sprintf("Called: %s\nSent: %s\nResponse: %s",
- host->address, big_buffer, responsebuffer);
+ /*XXX test here is ugly; seem to have a split of responsibility for
+ building this message. Need to rationalise. Where is it done
+ before here, and when not?
+ Not == 5xx resp to MAIL on main-verify
+ */
+ if (!addr->message) addr->message =
+ string_sprintf("response to \"%s\" was: %s",
+ big_buffer, string_printing(sx->buffer));
+
+ /* RFC 5321 section 4.2: the text portion of the response may have only
+ HT, SP, Printable US-ASCII. Deal with awkward chars by cutting the
+ received message off before passing it onward. Newlines are ok; they
+ just become a multiline response (but wrapped in the error code we
+ produce). */
+
+ for (uschar * s = sx->buffer;
+ *s && s < sx->buffer + sizeof(sx->buffer);
+ s++)
+ {
+ uschar c = *s;
+ if (c != '\t' && c != '\n' && (c < ' ' || c > '~'))
+ {
+ if (s - sx->buffer < sizeof(sx->buffer) - 12)
+ memcpy(s, "(truncated)", 12);
+ else
+ *s = '\0';
+ break;
+ }
+ }
+ addr->user_message = options & vopt_is_recipient
+ ? string_sprintf("Callout verification failed:\n%s", sx->buffer)
+ : string_sprintf("Called: %s\nSent: %s\nResponse: %s",
+ host->address, big_buffer, sx->buffer);
- /* Hard rejection ends the process */
+ /* Hard rejection ends the process */
- if (responsebuffer[0] == '5') /* Address rejected */
- {
- yield = FAIL;
- done = TRUE;
- }
- }
+ if (sx->buffer[0] == '5') /* Address rejected */
+ {
+ yield = FAIL;
+ done = TRUE;
+ }
+ break;
}
/* End the SMTP conversation and close the connection. */
- /* Cutthrough - on a successfull connect and recipient-verify with
+ /* Cutthrough - on a successful connect and recipient-verify with
use-sender and we are 1st rcpt and have no cutthrough conn so far
- here is where we want to leave the conn open */
- if ( cutthrough.delivery
+ here is where we want to leave the conn open. Ditto for a lazy-close
+ verify. */
+
+ if (cutthrough.delivery)
+ {
+ if (addr->transport->filter_command)
+ {
+ cutthrough.delivery= FALSE;
+ HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of transport filter\n");
+ }
+#ifndef DISABLE_DKIM
+ /* DKIM signing needs to add a header after seeing the whole body, so we cannot just copy
+ body bytes to the outbound as they are received, which is the intent of cutthrough. */
+ if (ob->dkim.dkim_domain)
+ {
+ cutthrough.delivery= FALSE;
+ HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
+ }
+#endif
+#ifdef EXPERIMENTAL_ARC
+ if (ob->arc_sign)
+ {
+ cutthrough.delivery= FALSE;
+ HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of ARC signing\n");
+ }
+#endif
+ }
+
+ if ( (cutthrough.delivery || options & vopt_callout_hold)
&& rcpt_count == 1
&& done
&& yield == OK
- && (options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == vopt_callout_recipsender
+ && (options & (vopt_callout_recipsender|vopt_callout_recippmaster|vopt_success_on_redirect))
+ == vopt_callout_recipsender
&& !random_local_part
&& !pm_mailfrom
- && cutthrough.fd < 0
- && !lmtp
+ && cutthrough.cctx.sock < 0
+ && !sx->lmtp
)
{
- cutthrough.fd = outblock.sock; /* We assume no buffer in use in the outblock */
- cutthrough.nrcpt = 1;
- cutthrough.interface = interface;
- cutthrough.host = *host;
- cutthrough.addr = *addr; /* Save the address_item for later logging */
- cutthrough.addr.next = NULL;
+ HDEBUG(D_acl|D_v) debug_printf_indent("holding verify callout open for %s\n",
+ cutthrough.delivery
+ ? "cutthrough delivery" : "potential further verifies and delivery");
+
+ cutthrough.callout_hold_only = !cutthrough.delivery;
+ cutthrough.is_tls = tls_out.active.sock >= 0;
+ /* We assume no buffer in use in the outblock */
+ cutthrough.cctx = sx->cctx;
+ cutthrough.nrcpt = 1;
+ cutthrough.transport = addr->transport->name;
+ cutthrough.interface = interface;
+ cutthrough.snd_port = sending_port;
+ cutthrough.peer_options = smtp_peer_options;
+ cutthrough.host = *host;
+ {
+ int oldpool = store_pool;
+ store_pool = POOL_PERM;
+ cutthrough.snd_ip = string_copy(sending_ip_address);
+ cutthrough.host.name = string_copy(host->name);
+ cutthrough.host.address = string_copy(host->address);
+ store_pool = oldpool;
+ }
+
+ /* Save the address_item and parent chain for later logging */
+ cutthrough.addr = *addr;
+ cutthrough.addr.next = NULL;
cutthrough.addr.host_used = &cutthrough.host;
- if (addr->parent)
- *(cutthrough.addr.parent = store_get(sizeof(address_item))) =
- *addr->parent;
- ctblock.buffer = ctbuffer;
- ctblock.buffersize = sizeof(ctbuffer);
- ctblock.ptr = ctbuffer;
- /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */
- ctblock.sock = cutthrough.fd;
+ for (address_item * caddr = &cutthrough.addr, * parent = addr->parent;
+ parent;
+ caddr = caddr->parent, parent = parent->parent)
+ *(caddr->parent = store_get(sizeof(address_item), GET_UNTAINTED)) = *parent;
+
+ ctctx.outblock.buffer = ctbuffer;
+ ctctx.outblock.buffersize = sizeof(ctbuffer);
+ ctctx.outblock.ptr = ctbuffer;
+ /* ctctx.outblock.cmd_count = 0; ctctx.outblock.authenticating = FALSE; */
+ ctctx.outblock.cctx = &cutthrough.cctx;
}
else
{
- /* Ensure no cutthrough on multiple address verifies */
+ /* Ensure no cutthrough on multiple verifies that were incompatible */
if (options & vopt_callout_recipsender)
- cancel_cutthrough_connection("multiple verify calls");
- if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
+ cancel_cutthrough_connection(TRUE, US"not usable for cutthrough");
+ if (sx->send_quit)
+ if (smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n") != -1)
+ /* Wait a short time for response, and discard it */
+ smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', 1);
-#ifdef SUPPORT_TLS
- tls_close(FALSE, TRUE);
+ if (sx->cctx.sock >= 0)
+ {
+#ifndef DISABLE_TLS
+ if (sx->cctx.tls_ctx)
+ {
+ tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
+ sx->cctx.tls_ctx = NULL;
+ }
#endif
- (void)close(inblock.sock);
-#ifdef EXPERIMENTAL_EVENT
- (void) event_raise(addr->transport->event_action,
- US"tcp:close", NULL);
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
+ (void)close(sx->cctx.sock);
+ sx->cctx.sock = -1;
+ smtp_debug_cmd_report();
+#ifndef DISABLE_EVENT
+ (void) event_raise(addr->transport->event_action, US"tcp:close", NULL, NULL);
#endif
+ }
}
+ if (!done || yield != OK)
+ addr->message = string_sprintf("%s [%s] : %s", host->name, host->address,
+ addr->message);
} /* Loop through all hosts, while !done */
}
/* If we get here with done == TRUE, a successful callout happened, and yield
will be set OK or FAIL according to the response to the RCPT command.
Otherwise, we looped through the hosts but couldn't complete the business.
-However, there may be domain-specific information to cache in both cases.
-
-The value of the result field in the new_domain record is ccache_unknown if
-there was an error before or with MAIL FROM:, and errno was not zero,
-implying some kind of I/O error. We don't want to write the cache in that case.
-Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
-
-if (!callout_no_cache && new_domain_record.result != ccache_unknown)
- {
- if ((dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE))
- == NULL)
- {
- HDEBUG(D_verify) debug_printf("callout cache: not available\n");
- }
- else
- {
- (void)dbfn_write(dbm_file, addr->domain, &new_domain_record,
- (int)sizeof(dbdata_callout_cache));
- HDEBUG(D_verify) debug_printf("wrote callout cache domain record:\n"
- " result=%d postmaster=%d random=%d\n",
- new_domain_record.result,
- new_domain_record.postmaster_result,
- new_domain_record.random_result);
- }
- }
-
-/* If a definite result was obtained for the callout, cache it unless caching
-is disabled. */
+However, there may be domain-specific information to cache in both cases. */
-if (done)
- {
- if (!callout_no_cache && new_address_record.result != ccache_unknown)
- {
- if (dbm_file == NULL)
- dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE);
- if (dbm_file == NULL)
- {
- HDEBUG(D_verify) debug_printf("no callout cache available\n");
- }
- else
- {
- (void)dbfn_write(dbm_file, address_key, &new_address_record,
- (int)sizeof(dbdata_callout_cache_address));
- HDEBUG(D_verify) debug_printf("wrote %s callout cache address record\n",
- (new_address_record.result == ccache_accept)? "positive" : "negative");
- }
- }
- } /* done */
+if (!(options & vopt_callout_no_cache))
+ cache_callout_write(&new_domain_record, addr->domain,
+ done, &new_address_record, address_key);
/* Failure to connect to any host, or any response other than 2xx or 5xx is a
temporary error. If there was only one host, and a response was received, leave
it alone if supplying details. Otherwise, give a generic response. */
-else /* !done */
+if (!done)
{
- uschar *dullmsg = string_sprintf("Could not complete %s verify callout",
- is_recipient? "recipient" : "sender");
+ uschar * dullmsg = string_sprintf("Could not complete %s verify callout",
+ options & vopt_is_recipient ? "recipient" : "sender");
yield = DEFER;
- if (host_list->next != NULL || addr->message == NULL) addr->message = dullmsg;
+ addr->message = host_list->next || !addr->message
+ ? dullmsg : string_sprintf("%s: %s", dullmsg, addr->message);
- addr->user_message = (!smtp_return_error_details)? dullmsg :
- string_sprintf("%s for <%s>.\n"
+ addr->user_message = smtp_return_error_details
+ ? string_sprintf("%s for <%s>.\n"
"The mail server(s) for the domain may be temporarily unreachable, or\n"
"they may be permanently unreachable from this server. In the latter case,\n%s",
dullmsg, addr->address,
- is_recipient?
- "the address will never be accepted."
- :
- "you need to change the address or create an MX record for its domain\n"
- "if it is supposed to be generally accessible from the Internet.\n"
- "Talk to your mail administrator for details.");
+ options & vopt_is_recipient
+ ? "the address will never be accepted."
+ : "you need to change the address or create an MX record for its domain\n"
+ "if it is supposed to be generally accessible from the Internet.\n"
+ "Talk to your mail administrator for details.")
+ : dullmsg;
/* Force a specific error code */
/* Come here from within the cache-reading code on fast-track exit. */
END_CALLOUT:
-if (dbm_file != NULL) dbfn_close(dbm_file);
+tls_modify_variables(&tls_in); /* return variables to inbound values */
return yield;
}
/* Called after recipient-acl to get a cutthrough connection open when
one was requested and a recipient-verify wasn't subsequently done.
*/
-void
-open_cutthrough_connection( address_item * addr )
+int
+open_cutthrough_connection(address_item * addr)
{
address_item addr2;
+int rc;
/* Use a recipient-verify-callout to set up the cutthrough connection. */
/* We must use a copy of the address for verification, because it might
get rewritten. */
addr2 = *addr;
-HDEBUG(D_acl) debug_printf("----------- %s cutthrough setup ------------\n",
+HDEBUG(D_acl) debug_printf_indent("----------- %s cutthrough setup ------------\n",
rcpt_count > 1 ? "more" : "start");
-(void) verify_address(&addr2, NULL,
+rc = verify_address(&addr2, NULL,
vopt_is_recipient | vopt_callout_recipsender | vopt_callout_no_cache,
CUTTHROUGH_CMD_TIMEOUT, -1, -1,
NULL, NULL, NULL);
-HDEBUG(D_acl) debug_printf("----------- end cutthrough setup ------------\n");
-return;
+addr->message = addr2.message;
+addr->user_message = addr2.user_message;
+HDEBUG(D_acl) debug_printf_indent("----------- end cutthrough setup ------------\n");
+return rc;
}
static BOOL
cutthrough_send(int n)
{
-if(cutthrough.fd < 0)
+if(cutthrough.cctx.sock < 0)
return TRUE;
if(
-#ifdef SUPPORT_TLS
- (tls_out.active == cutthrough.fd) ? tls_write(FALSE, ctblock.buffer, n) :
+#ifndef DISABLE_TLS
+ cutthrough.is_tls
+ ? tls_write(cutthrough.cctx.tls_ctx, ctctx.outblock.buffer, n, FALSE)
+ :
#endif
- send(cutthrough.fd, ctblock.buffer, n, 0) > 0
+ send(cutthrough.cctx.sock, ctctx.outblock.buffer, n, 0) > 0
)
{
transport_count += n;
- ctblock.ptr= ctblock.buffer;
+ ctctx.outblock.ptr= ctctx.outblock.buffer;
return TRUE;
}
-HDEBUG(D_transport|D_acl) debug_printf("cutthrough_send failed: %s\n", strerror(errno));
+HDEBUG(D_transport|D_acl) debug_printf_indent("cutthrough_send failed: %s\n", strerror(errno));
return FALSE;
}
{
while(n--)
{
- if(ctblock.ptr >= ctblock.buffer+ctblock.buffersize)
- if(!cutthrough_send(ctblock.buffersize))
+ if(ctctx.outblock.ptr >= ctctx.outblock.buffer+ctctx.outblock.buffersize)
+ if(!cutthrough_send(ctctx.outblock.buffersize))
return FALSE;
- *ctblock.ptr++ = *cp++;
+ *ctctx.outblock.ptr++ = *cp++;
}
return TRUE;
}
/* Buffered output of counted data block. Return boolean success */
-BOOL
+static BOOL
cutthrough_puts(uschar * cp, int n)
{
-if (cutthrough.fd < 0) return TRUE;
-if (_cutthrough_puts(cp, n)) return TRUE;
-cancel_cutthrough_connection("transmit failed");
+if (cutthrough.cctx.sock < 0) return TRUE;
+if (_cutthrough_puts(cp, n)) return TRUE;
+cancel_cutthrough_connection(TRUE, US"transmit failed");
return FALSE;
}
+void
+cutthrough_data_puts(uschar * cp, int n)
+{
+if (cutthrough.delivery) (void) cutthrough_puts(cp, n);
+return;
+}
+
static BOOL
_cutthrough_flush_send(void)
{
-int n= ctblock.ptr-ctblock.buffer;
+int n = ctctx.outblock.ptr - ctctx.outblock.buffer;
if(n>0)
if(!cutthrough_send(n))
cutthrough_flush_send(void)
{
if (_cutthrough_flush_send()) return TRUE;
-cancel_cutthrough_connection("transmit failed");
+cancel_cutthrough_connection(TRUE, US"transmit failed");
return FALSE;
}
-BOOL
+static BOOL
cutthrough_put_nl(void)
{
return cutthrough_puts(US"\r\n", 2);
}
+void
+cutthrough_data_put_nl(void)
+{
+cutthrough_data_puts(US"\r\n", 2);
+}
+
+
/* Get and check response from cutthrough target */
static uschar
-cutthrough_response(char expect, uschar ** copy)
+cutthrough_response(client_conn_ctx * cctx, char expect, uschar ** copy, int timeout)
{
-smtp_inblock inblock;
+smtp_context sx = {0};
uschar inbuffer[4096];
uschar responsebuffer[4096];
-inblock.buffer = inbuffer;
-inblock.buffersize = sizeof(inbuffer);
-inblock.ptr = inbuffer;
-inblock.ptrend = inbuffer;
-inblock.sock = cutthrough.fd;
-/* this relies on (inblock.sock == tls_out.active) */
-if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, CUTTHROUGH_DATA_TIMEOUT))
- cancel_cutthrough_connection("target timeout on read");
+sx.inblock.buffer = inbuffer;
+sx.inblock.buffersize = sizeof(inbuffer);
+sx.inblock.ptr = inbuffer;
+sx.inblock.ptrend = inbuffer;
+sx.inblock.cctx = cctx;
+if(!smtp_read_response(&sx, responsebuffer, sizeof(responsebuffer), expect, timeout))
+ cancel_cutthrough_connection(TRUE, US"target timeout on read");
-if(copy != NULL)
+if(copy)
{
uschar * cp;
*copy = cp = string_copy(responsebuffer);
BOOL
cutthrough_predata(void)
{
-if(cutthrough.fd < 0)
+if(cutthrough.cctx.sock < 0 || cutthrough.callout_hold_only)
return FALSE;
-HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> DATA\n");
+smtp_debug_cmd(US"DATA", 0);
cutthrough_puts(US"DATA\r\n", 6);
cutthrough_flush_send();
/* Assume nothing buffered. If it was it gets ignored. */
-return cutthrough_response('3', NULL) == '3';
+return cutthrough_response(&cutthrough.cctx, '3', NULL, CUTTHROUGH_DATA_TIMEOUT) == '3';
}
-/* fd and use_crlf args only to match write_chunk() */
+/* tctx arg only to match write_chunk() */
static BOOL
-cutthrough_write_chunk(int fd, uschar * s, int len, BOOL use_crlf)
+cutthrough_write_chunk(transport_ctx * tctx, uschar * s, int len)
{
uschar * s2;
while(s && (s2 = Ustrchr(s, '\n')))
BOOL
cutthrough_headers_send(void)
{
-if(cutthrough.fd < 0)
+transport_ctx tctx;
+
+if(cutthrough.cctx.sock < 0 || cutthrough.callout_hold_only)
return FALSE;
/* We share a routine with the mainline transport to handle header add/remove/rewrites,
but having a separate buffered-output function (for now)
*/
-HDEBUG(D_acl) debug_printf("----------- start cutthrough headers send -----------\n");
-
-if (!transport_headers_send(&cutthrough.addr, cutthrough.fd,
- cutthrough.addr.transport->add_headers,
- cutthrough.addr.transport->remove_headers,
- &cutthrough_write_chunk, TRUE,
- cutthrough.addr.transport->rewrite_rules,
- cutthrough.addr.transport->rewrite_existflags))
+HDEBUG(D_acl) debug_printf_indent("----------- start cutthrough headers send -----------\n");
+
+tctx.u.fd = cutthrough.cctx.sock;
+tctx.tblock = cutthrough.addr.transport;
+tctx.addr = &cutthrough.addr;
+tctx.check_string = US".";
+tctx.escape_string = US"..";
+/*XXX check under spool_files_wireformat. Might be irrelevant */
+tctx.options = topt_use_crlf;
+
+if (!transport_headers_send(&tctx, &cutthrough_write_chunk))
return FALSE;
-HDEBUG(D_acl) debug_printf("----------- done cutthrough headers send ------------\n");
+HDEBUG(D_acl) debug_printf_indent("----------- done cutthrough headers send ------------\n");
return TRUE;
}
static void
-close_cutthrough_connection(const char * why)
+close_cutthrough_connection(const uschar * why)
{
-if(cutthrough.fd >= 0)
+int fd = cutthrough.cctx.sock;
+if(fd >= 0)
{
/* We could be sending this after a bunch of data, but that is ok as
the only way to cancel the transfer in dataphase is to drop the tcp
conn before the final dot.
*/
- ctblock.ptr = ctbuffer;
- HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> QUIT\n");
+ client_conn_ctx tmp_ctx = cutthrough.cctx;
+ ctctx.outblock.ptr = ctbuffer;
+ smtp_debug_cmd(US"QUIT", 0);
_cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */
_cutthrough_flush_send();
- /* No wait for response */
-
- #ifdef SUPPORT_TLS
- tls_close(FALSE, TRUE);
- #endif
- (void)close(cutthrough.fd);
- cutthrough.fd = -1;
- HDEBUG(D_acl) debug_printf("----------- cutthrough shutdown (%s) ------------\n", why);
+ cutthrough.cctx.sock = -1; /* avoid recursion via read timeout */
+ cutthrough.nrcpt = 0; /* permit re-cutthrough on subsequent message */
+
+ /* Wait a short time for response, and discard it */
+ cutthrough_response(&tmp_ctx, '2', NULL, 1);
+
+#ifndef DISABLE_TLS
+ if (cutthrough.is_tls)
+ {
+ tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
+ cutthrough.cctx.tls_ctx = NULL;
+ cutthrough.is_tls = FALSE;
+ }
+#endif
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
+ (void)close(fd);
+ smtp_debug_cmd_report();
+ HDEBUG(D_acl) debug_printf_indent("----------- cutthrough shutdown (%s) ------------\n", why);
}
-ctblock.ptr = ctbuffer;
+ctctx.outblock.ptr = ctbuffer;
+}
+
+void
+cancel_cutthrough_connection(BOOL close_noncutthrough_verifies, const uschar * why)
+{
+if (cutthrough.delivery || close_noncutthrough_verifies)
+ close_cutthrough_connection(why);
+cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
}
+
void
-cancel_cutthrough_connection(const char * why)
+release_cutthrough_connection(const uschar * why)
{
-close_cutthrough_connection(why);
-cutthrough.delivery = FALSE;
+if (cutthrough.cctx.sock < 0) return;
+HDEBUG(D_acl) debug_printf_indent("release cutthrough conn: %s\n", why);
+cutthrough.cctx.sock = -1;
+cutthrough.cctx.tls_ctx = NULL;
+cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
}
cutthrough_finaldot(void)
{
uschar res;
-address_item * addr;
-HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> .\n");
+HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> .\n");
/* Assume data finshed with new-line */
if( !cutthrough_puts(US".", 1)
)
return cutthrough.addr.message;
-res = cutthrough_response('2', &cutthrough.addr.message);
-for (addr = &cutthrough.addr; addr; addr = addr->next)
+res = cutthrough_response(&cutthrough.cctx, '2', &cutthrough.addr.message,
+ CUTTHROUGH_DATA_TIMEOUT);
+for (address_item * addr = &cutthrough.addr; addr; addr = addr->next)
{
addr->message = cutthrough.addr.message;
switch(res)
{
case '2':
delivery_log(LOG_MAIN, addr, (int)'>', NULL);
- close_cutthrough_connection("delivered");
+ close_cutthrough_connection(US"delivered");
break;
case '4':
vaddr->user_message = addr->user_message;
vaddr->basic_errno = addr->basic_errno;
vaddr->more_errno = addr->more_errno;
- vaddr->p.address_data = addr->p.address_data;
+ vaddr->prop.address_data = addr->prop.address_data;
+ vaddr->prop.variables = NULL;
+ tree_dup((tree_node **)&vaddr->prop.variables, addr->prop.variables);
copyflag(vaddr, addr, af_pass_message);
}
return yield;
va_start(ap, format);
if (smtp_out && (f == smtp_out))
- smtp_vprintf(format, ap);
+ smtp_vprintf(format, FALSE, ap);
else
vfprintf(f, format, ap);
va_end(ap);
Arguments:
vaddr contains the address to verify; the next field in this block
must be NULL
- f if not NULL, write the result to this file
+ fp if not NULL, write the result to this file
options various option bits:
vopt_fake_sender => this sender verify is not for the real
sender (it was verify=sender=xxxx or an address from a
*/
int
-verify_address(address_item *vaddr, FILE *f, int options, int callout,
- int callout_overall, int callout_connect, uschar *se_mailfrom,
+verify_address(address_item * vaddr, FILE * fp, int options, int callout,
+ int callout_overall, int callout_connect, uschar * se_mailfrom,
uschar *pm_mailfrom, BOOL *routed)
{
BOOL allok = TRUE;
-BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0);
-BOOL is_recipient = (options & vopt_is_recipient) != 0;
+BOOL full_info = fp ? debug_selector != 0 : FALSE;
BOOL expn = (options & vopt_expn) != 0;
BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0;
int i;
int yield = OK;
-int verify_type = expn? v_expn :
- address_test_mode? v_none :
- is_recipient? v_recipient : v_sender;
+int verify_type = expn ? v_expn :
+ f.address_test_mode ? v_none :
+ options & vopt_is_recipient ? v_recipient : v_sender;
address_item *addr_list;
address_item *addr_new = NULL;
address_item *addr_remote = NULL;
address_item *addr_local = NULL;
address_item *addr_succeed = NULL;
-uschar **failure_ptr = is_recipient?
- &recipient_verify_failure : &sender_verify_failure;
+uschar **failure_ptr = options & vopt_is_recipient
+ ? &recipient_verify_failure : &sender_verify_failure;
uschar *ko_prefix, *cr;
uschar *address = vaddr->address;
uschar *save_sender;
if (parse_find_at(address) == NULL)
{
- if ((options & vopt_qualify) == 0)
+ if (!(options & vopt_qualify))
{
- if (f != NULL)
- respond_printf(f, "%sA domain is required for \"%s\"%s\n",
+ if (fp)
+ respond_printf(fp, "%sA domain is required for \"%s\"%s\n",
ko_prefix, address, cr);
*failure_ptr = US"qualify";
return FAIL;
}
- address = rewrite_address_qualify(address, is_recipient);
+ /* deconst ok as address was not const */
+ address = US rewrite_address_qualify(address, options & vopt_is_recipient);
}
DEBUG(D_verify)
{
debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
- debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address);
+ debug_printf("%s %s\n", f.address_test_mode? "Testing" : "Verifying", address);
}
/* Rewrite and report on it. Clear the domain and local part caches - these
may have been set by domains and local part tests during an ACL. */
-if (global_rewrite_rules != NULL)
+if (global_rewrite_rules)
{
uschar *old = address;
- address = rewrite_address(address, is_recipient, FALSE,
+ /* deconst ok as address was not const */
+ address = US rewrite_address(address, options & vopt_is_recipient, FALSE,
global_rewrite_rules, rewrite_existflags);
if (address != old)
{
- for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0;
- for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0;
- if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address);
+ for (int i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0;
+ for (int i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0;
+ if (fp && !expn) fprintf(fp, "Address rewritten as: %s\n", address);
}
}
/* If this is the real sender address, we must update sender_address at
this point, because it may be referred to in the routers. */
-if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0)
+if (!(options & (vopt_fake_sender|vopt_is_recipient)))
sender_address = address;
/* If the address was rewritten to <> no verification can be done, and we have
to return OK. This rewriting is permitted only for sender addresses; for other
addresses, such rewriting fails. */
-if (address[0] == 0) return OK;
+if (!address[0]) return OK;
/* Flip the legacy TLS-related variables over to the outbound set in case
they're used in the context of a transport used by verification. Reset them
-at exit from this routine. */
+at exit from this routine (so no returns allowed from here on). */
tls_modify_variables(&tls_out);
save_sender = sender_address;
+/* Observability variable for router/transport use */
+
+verify_mode = options & vopt_is_recipient ? US"R" : US"S";
+
/* Update the address structure with the possibly qualified and rewritten
address. Set it up as the starting address on the chain of new addresses. */
full_info is set, and this can only be set locally. Remote enquiries just get
information about the top level address, not anything that it generated. */
-while (addr_new != NULL)
+while (addr_new)
{
int rc;
address_item *addr = addr_new;
if (testflag(addr, af_pfr))
{
allok = FALSE;
- if (f != NULL)
+ if (fp)
{
BOOL allow;
if (addr->address[0] == '>')
{
allow = testflag(addr, af_allow_reply);
- fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1);
+ fprintf(fp, "%s -> mail %s", addr->parent->address, addr->address + 1);
}
else
{
- allow = (addr->address[0] == '|')?
- testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file);
- fprintf(f, "%s -> %s", addr->parent->address, addr->address);
+ allow = addr->address[0] == '|'
+ ? testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file);
+ fprintf(fp, "%s -> %s", addr->parent->address, addr->address);
}
if (addr->basic_errno == ERRNO_BADTRANSPORT)
- fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n"
+ fprintf(fp, "\n*** Error in setting up pipe, file, or autoreply:\n"
"%s\n", addr->message);
else if (allow)
- fprintf(f, "\n transport = %s\n", addr->transport->name);
+ fprintf(fp, "\n transport = %s\n", addr->transport->name);
else
- fprintf(f, " *** forbidden ***\n");
+ fprintf(fp, " *** forbidden ***\n");
}
continue;
}
/* Just in case some router parameter refers to it. */
- return_path = (addr->p.errors_address != NULL)?
- addr->p.errors_address : sender_address;
+ return_path = addr->prop.errors_address
+ ? addr->prop.errors_address : sender_address;
/* Split the address into domain and local part, handling the %-hack if
necessary, and then route it. While routing a sender address, set
$sender_address to <> because that is what it will be if we were trying to
send a bounce to the sender. */
- if (routed != NULL) *routed = FALSE;
+ if (routed) *routed = FALSE;
if ((rc = deliver_split_address(addr)) == OK)
{
- if (!is_recipient) sender_address = null_sender;
+ if (!(options & vopt_is_recipient)) sender_address = null_sender;
rc = route_address(addr, &addr_local, &addr_remote, &addr_new,
&addr_succeed, verify_type);
sender_address = save_sender; /* Put back the real sender */
if (rc == OK)
{
- if (routed != NULL) *routed = TRUE;
+ BOOL local_verify = FALSE;
+
+ if (routed) *routed = TRUE;
if (callout > 0)
{
- host_item *host_list = addr->host_list;
+ transport_instance * tp;
+ host_item * host_list = addr->host_list;
/* Make up some data for use in the case where there is no remote
transport. */
transport_feedback tf = {
- NULL, /* interface (=> any) */
- US"smtp", /* port */
- US"smtp", /* protocol */
- NULL, /* hosts */
- US"$smtp_active_hostname", /* helo_data */
- FALSE, /* hosts_override */
- FALSE, /* hosts_randomize */
- FALSE, /* gethostbyname */
- TRUE, /* qualify_single */
- FALSE /* search_parents */
+ .interface = NULL, /* interface (=> any) */
+ .port = US"smtp",
+ .protocol = US"smtp",
+ .hosts = NULL,
+ .helo_data = US"$smtp_active_hostname",
+ .hosts_override = FALSE,
+ .hosts_randomize = FALSE,
+ .gethostbyname = FALSE,
+ .qualify_single = TRUE,
+ .search_parents = FALSE
};
/* If verification yielded a remote transport, we want to use that
transport's options, so as to mimic what would happen if we were really
sending a message to this address. */
- if (addr->transport != NULL && !addr->transport->info->local)
- {
- (void)(addr->transport->setup)(addr->transport, addr, &tf, 0, 0, NULL);
+ if ((tp = addr->transport))
+ if (!tp->info->local)
+ {
+ (void)(tp->setup)(tp, addr, &tf, 0, 0, NULL);
- /* If the transport has hosts and the router does not, or if the
- transport is configured to override the router's hosts, we must build a
- host list of the transport's hosts, and find the IP addresses */
+ /* If the transport has hosts and the router does not, or if the
+ transport is configured to override the router's hosts, we must build a
+ host list of the transport's hosts, and find the IP addresses */
- if (tf.hosts != NULL && (host_list == NULL || tf.hosts_override))
- {
- uschar *s;
- const uschar *save_deliver_domain = deliver_domain;
- uschar *save_deliver_localpart = deliver_localpart;
-
- host_list = NULL; /* Ignore the router's hosts */
-
- deliver_domain = addr->domain;
- deliver_localpart = addr->local_part;
- s = expand_string(tf.hosts);
- deliver_domain = save_deliver_domain;
- deliver_localpart = save_deliver_localpart;
-
- if (s == NULL)
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts "
- "\"%s\" in %s transport for callout: %s", tf.hosts,
- addr->transport->name, expand_string_message);
- }
- else
- {
- int flags;
- host_item *host, *nexthost;
- host_build_hostlist(&host_list, s, tf.hosts_randomize);
-
- /* Just ignore failures to find a host address. If we don't manage
- to find any addresses, the callout will defer. Note that more than
- one address may be found for a single host, which will result in
- additional host items being inserted into the chain. Hence we must
- save the next host first. */
-
- flags = HOST_FIND_BY_A;
- if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
- if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
-
- for (host = host_list; host != NULL; host = nexthost)
- {
- nexthost = host->next;
- if (tf.gethostbyname ||
- string_is_ip_address(host->name, NULL) != 0)
- (void)host_find_byname(host, NULL, flags, NULL, TRUE);
- else
+ if (tf.hosts && (!host_list || tf.hosts_override))
+ {
+ uschar *s;
+ const uschar *save_deliver_domain = deliver_domain;
+ uschar *save_deliver_localpart = deliver_localpart;
+
+ host_list = NULL; /* Ignore the router's hosts */
+
+ deliver_domain = addr->domain;
+ deliver_localpart = addr->local_part;
+ s = expand_string(tf.hosts);
+ deliver_domain = save_deliver_domain;
+ deliver_localpart = save_deliver_localpart;
+
+ if (!s)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts "
+ "\"%s\" in %s transport for callout: %s", tf.hosts,
+ tp->name, expand_string_message);
+ }
+ else
+ {
+ int flags;
+ host_build_hostlist(&host_list, s, tf.hosts_randomize);
+
+ /* Just ignore failures to find a host address. If we don't manage
+ to find any addresses, the callout will defer. Note that more than
+ one address may be found for a single host, which will result in
+ additional host items being inserted into the chain. Hence we must
+ save the next host first. */
+
+ flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
+ if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
+ if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
+
+ for (host_item * host = host_list, * nexthost; host; host = nexthost)
{
- uschar * d_request = NULL, * d_require = NULL;
- if (Ustrcmp(addr->transport->driver_name, "smtp") == 0)
+ nexthost = host->next;
+ if (tf.gethostbyname ||
+ string_is_ip_address(host->name, NULL) != 0)
+ (void)host_find_byname(host, NULL, flags, NULL, TRUE);
+ else
{
- smtp_transport_options_block * ob =
- (smtp_transport_options_block *)
- addr->transport->options_block;
- d_request = ob->dnssec_request_domains;
- d_require = ob->dnssec_require_domains;
+ const dnssec_domains * dsp = NULL;
+ if (Ustrcmp(tp->driver_name, "smtp") == 0)
+ {
+ smtp_transport_options_block * ob =
+ (smtp_transport_options_block *) tp->options_block;
+ dsp = &ob->dnssec;
+ }
+
+ (void) host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
+ dsp, NULL, NULL);
}
-
- (void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
- d_request, d_require, NULL, NULL);
}
- }
- }
- }
- }
+ }
+ }
+ }
+ else if ( options & vopt_quota
+ && Ustrcmp(tp->driver_name, "appendfile") == 0)
+ local_verify = TRUE;
/* Can only do a callout if we have at least one host! If the callout
fails, it will have set ${sender,recipient}_verify_failure. */
- if (host_list != NULL)
+ if (host_list)
{
HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n");
- if (host_checking && !host_checking_callout)
+ if (host_checking && !f.host_checking_callout)
{
HDEBUG(D_verify)
debug_printf("... callout omitted by default when host testing\n"
}
else
{
-#ifdef SUPPORT_TLS
+#ifndef DISABLE_TLS
deliver_set_expansions(addr);
#endif
- verify_mode = is_recipient ? US"R" : US"S";
rc = do_callout(addr, host_list, &tf, callout, callout_overall,
callout_connect, options, se_mailfrom, pm_mailfrom);
- verify_mode = NULL;
+#ifndef DISABLE_TLS
+ deliver_set_expansions(NULL);
+#endif
+ if ( options & vopt_is_recipient
+ && rc == OK
+ /* set to "random", with OK, for an accepted random */
+ && !recipient_verify_failure
+ )
+ callout_verified_rcpt(addr);
}
}
+ else if (local_verify)
+ {
+ HDEBUG(D_verify) debug_printf("Attempting quota verification\n");
+
+ deliver_set_expansions(addr);
+ deliver_local(addr, TRUE);
+ rc = addr->transport_return;
+ }
else
- {
HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor "
- "transport provided a host list\n");
- }
+ "transport provided a host list, or transport is not smtp\n");
}
}
if (rc == FAIL)
{
allok = FALSE;
- if (f != NULL)
+ if (fp)
{
address_item *p = addr->parent;
- respond_printf(f, "%s%s %s", ko_prefix,
- full_info? addr->address : address,
- address_test_mode? "is undeliverable" : "failed to verify");
- if (!expn && admin_user)
+ respond_printf(fp, "%s%s %s", ko_prefix,
+ full_info ? addr->address : address,
+ f.address_test_mode ? "is undeliverable" : "failed to verify");
+ if (!expn && f.admin_user)
{
if (addr->basic_errno > 0)
- respond_printf(f, ": %s", strerror(addr->basic_errno));
- if (addr->message != NULL)
- respond_printf(f, ": %s", addr->message);
+ respond_printf(fp, ": %s", strerror(addr->basic_errno));
+ if (addr->message)
+ respond_printf(fp, ": %s", addr->message);
}
/* Show parents iff doing full info */
- if (full_info) while (p != NULL)
+ if (full_info) while (p)
{
- respond_printf(f, "%s\n <-- %s", cr, p->address);
+ respond_printf(fp, "%s\n <-- %s", cr, p->address);
p = p->parent;
}
- respond_printf(f, "%s\n", cr);
+ respond_printf(fp, "%s\n", cr);
}
- cancel_cutthrough_connection("routing hard fail");
+ cancel_cutthrough_connection(TRUE, US"routing hard fail");
if (!full_info)
- {
+ {
yield = copy_error(vaddr, addr, FAIL);
goto out;
- }
- else yield = FAIL;
+ }
+ yield = FAIL;
}
/* Soft failure */
else if (rc == DEFER)
{
allok = FALSE;
- if (f != NULL)
+ if (fp)
{
address_item *p = addr->parent;
- respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix,
+ respond_printf(fp, "%s%s cannot be resolved at this time", ko_prefix,
full_info? addr->address : address);
- if (!expn && admin_user)
+ if (!expn && f.admin_user)
{
if (addr->basic_errno > 0)
- respond_printf(f, ": %s", strerror(addr->basic_errno));
- if (addr->message != NULL)
- respond_printf(f, ": %s", addr->message);
+ respond_printf(fp, ": %s", strerror(addr->basic_errno));
+ if (addr->message)
+ respond_printf(fp, ": %s", addr->message);
else if (addr->basic_errno <= 0)
- respond_printf(f, ": unknown error");
+ respond_printf(fp, ": unknown error");
}
/* Show parents iff doing full info */
- if (full_info) while (p != NULL)
+ if (full_info) while (p)
{
- respond_printf(f, "%s\n <-- %s", cr, p->address);
+ respond_printf(fp, "%s\n <-- %s", cr, p->address);
p = p->parent;
}
- respond_printf(f, "%s\n", cr);
+ respond_printf(fp, "%s\n", cr);
}
- cancel_cutthrough_connection("routing soft fail");
+ cancel_cutthrough_connection(TRUE, US"routing soft fail");
if (!full_info)
{
yield = copy_error(vaddr, addr, DEFER);
goto out;
}
- else if (yield == OK) yield = DEFER;
+ if (yield == OK) yield = DEFER;
}
/* If we are handling EXPN, we do not want to continue to route beyond
else if (expn)
{
uschar *ok_prefix = US"250-";
- if (addr_new == NULL)
- {
- if (addr_local == NULL && addr_remote == NULL)
- respond_printf(f, "250 mail to <%s> is discarded\r\n", address);
+
+ if (!addr_new)
+ if (!addr_local && !addr_remote)
+ respond_printf(fp, "250 mail to <%s> is discarded\r\n", address);
else
- respond_printf(f, "250 <%s>\r\n", address);
- }
- else while (addr_new != NULL)
+ respond_printf(fp, "250 <%s>\r\n", address);
+
+ else do
{
address_item *addr2 = addr_new;
addr_new = addr2->next;
- if (addr_new == NULL) ok_prefix = US"250 ";
- respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
- }
+ if (!addr_new) ok_prefix = US"250 ";
+ respond_printf(fp, "%s<%s>\r\n", ok_prefix, addr2->address);
+ } while (addr_new);
yield = OK;
goto out;
}
just a single new address as a special case, and continues on to verify the
generated address. */
- if (!full_info && /* Stop if short info wanted AND */
- (((addr_new == NULL || /* No new address OR */
- addr_new->next != NULL || /* More than one new address OR */
- testflag(addr_new, af_pfr))) /* New address is pfr */
- || /* OR */
- (addr_new != NULL && /* At least one new address AND */
- success_on_redirect))) /* success_on_redirect is set */
+ if ( !full_info /* Stop if short info wanted AND */
+ && ( ( !addr_new /* No new address OR */
+ || addr_new->next /* More than one new address OR */
+ || testflag(addr_new, af_pfr) /* New address is pfr */
+ )
+ || /* OR */
+ ( addr_new /* At least one new address AND */
+ && success_on_redirect /* success_on_redirect is set */
+ ) )
+ )
{
- if (f != NULL) fprintf(f, "%s %s\n", address,
- address_test_mode? "is deliverable" : "verified");
+ if (fp) fprintf(fp, "%s %s\n",
+ address, f.address_test_mode ? "is deliverable" : "verified");
/* If we have carried on to verify a child address, we want the value
of $address_data to be that of the child */
- vaddr->p.address_data = addr->p.address_data;
+ vaddr->prop.address_data = addr->prop.address_data;
+ vaddr->prop.variables = NULL;
+ tree_dup((tree_node **)&vaddr->prop.variables, addr->prop.variables);
+
+ /* If stopped because more than one new address, cannot cutthrough */
+
+ if (addr_new && addr_new->next)
+ cancel_cutthrough_connection(TRUE, US"multiple addresses from routing");
+
yield = OK;
goto out;
}
} /* Loop for generated addresses */
/* Display the full results of the successful routing, including any generated
-addresses. Control gets here only when full_info is set, which requires f not
+addresses. Control gets here only when full_info is set, which requires fp not
to be NULL, and this occurs only when a top-level verify is called with the
debugging switch on.
or autoreplies, and there were no errors or deferments, the message is to be
discarded, usually because of the use of :blackhole: in an alias file. */
-if (allok && addr_local == NULL && addr_remote == NULL)
+if (allok && !addr_local && !addr_remote)
{
- fprintf(f, "mail to %s is discarded\n", address);
+ fprintf(fp, "mail to %s is discarded\n", address);
goto out;
}
for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
- {
- while (addr_list != NULL)
+ while (addr_list)
{
address_item *addr = addr_list;
- address_item *p = addr->parent;
+ transport_instance * tp = addr->transport;
+
addr_list = addr->next;
- fprintf(f, "%s", CS addr->address);
-#ifdef EXPERIMENTAL_SRS
- if(addr->p.srs_sender)
- fprintf(f, " [srs = %s]", addr->p.srs_sender);
-#endif
+ fprintf(fp, "%s", CS addr->address);
/* If the address is a duplicate, show something about it. */
if (!testflag(addr, af_pfr))
{
tree_node *tnode;
- if ((tnode = tree_search(tree_duplicates, addr->unique)) != NULL)
- fprintf(f, " [duplicate, would not be delivered]");
+ if ((tnode = tree_search(tree_duplicates, addr->unique)))
+ fprintf(fp, " [duplicate, would not be delivered]");
else tree_add_duplicate(addr->unique, addr);
}
/* Now show its parents */
- while (p != NULL)
- {
- fprintf(f, "\n <-- %s", p->address);
- p = p->parent;
- }
- fprintf(f, "\n ");
+ for (address_item * p = addr->parent; p; p = p->parent)
+ fprintf(fp, "\n <-- %s", p->address);
+ fprintf(fp, "\n ");
/* Show router, and transport */
- fprintf(f, "router = %s, ", addr->router->name);
- fprintf(f, "transport = %s\n", (addr->transport == NULL)? US"unset" :
- addr->transport->name);
+ fprintf(fp, "router = %s, transport = %s\n",
+ addr->router->name, tp ? tp->name : US"unset");
/* Show any hosts that are set up by a router unless the transport
is going to override them; fiddle a bit to get a nice format. */
- if (addr->host_list != NULL && addr->transport != NULL &&
- !addr->transport->overrides_hosts)
+ if (addr->host_list && tp && !tp->overrides_hosts)
{
- host_item *h;
int maxlen = 0;
int maxaddlen = 0;
- for (h = addr->host_list; h != NULL; h = h->next)
- {
+ for (host_item * h = addr->host_list; h; h = h->next)
+ { /* get max lengths of host names, addrs */
int len = Ustrlen(h->name);
if (len > maxlen) maxlen = len;
- len = (h->address != NULL)? Ustrlen(h->address) : 7;
+ len = h->address ? Ustrlen(h->address) : 7;
if (len > maxaddlen) maxaddlen = len;
}
- for (h = addr->host_list; h != NULL; h = h->next)
- {
- int len = Ustrlen(h->name);
- fprintf(f, " host %s ", h->name);
- while (len++ < maxlen) fprintf(f, " ");
- if (h->address != NULL)
- {
- fprintf(f, "[%s] ", h->address);
- len = Ustrlen(h->address);
- }
- else if (!addr->transport->info->local) /* Omit [unknown] for local */
- {
- fprintf(f, "[unknown] ");
- len = 7;
- }
- else len = -3;
- while (len++ < maxaddlen) fprintf(f," ");
- if (h->mx >= 0) fprintf(f, "MX=%d", h->mx);
- if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port);
- if (h->status == hstatus_unusable) fprintf(f, " ** unusable **");
- fprintf(f, "\n");
+ for (host_item * h = addr->host_list; h; h = h->next)
+ {
+ fprintf(fp, " host %-*s ", maxlen, h->name);
+
+ if (h->address)
+ fprintf(fp, "[%s%-*c", h->address, maxaddlen+1 - Ustrlen(h->address), ']');
+ else if (tp->info->local)
+ fprintf(fp, " %-*s ", maxaddlen, ""); /* Omit [unknown] for local */
+ else
+ fprintf(fp, "[%s%-*c", "unknown", maxaddlen+1 - 7, ']');
+
+ if (h->mx >= 0) fprintf(fp, " MX=%d", h->mx);
+ if (h->port != PORT_NONE) fprintf(fp, " port=%d", h->port);
+ if (f.running_in_test_harness && h->dnssec == DS_YES) fputs(" AD", fp);
+ if (h->status == hstatus_unusable) fputs(" ** unusable **", fp);
+ fputc('\n', fp);
}
}
}
- }
/* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
the -bv or -bt case). */
out:
-tls_modify_variables(&tls_in);
+verify_mode = NULL;
+tls_modify_variables(&tls_in); /* return variables to inbound values */
return yield;
}
*************************************************/
/* This function checks those header lines that contain addresses, and verifies
-that all the addresses therein are syntactially correct.
+that all the addresses therein are 5322-syntactially correct.
Arguments:
msgptr where to put an error message
int
verify_check_headers(uschar **msgptr)
{
-header_line *h;
uschar *colon, *s;
int yield = OK;
-for (h = header_list; h != NULL && yield == OK; h = h->next)
+for (header_line * h = header_list; h && yield == OK; h = h->next)
{
if (h->type != htype_from &&
h->type != htype_reply_to &&
colon = Ustrchr(h->text, ':');
s = colon + 1;
- while (isspace(*s)) s++;
+ Uskip_whitespace(&s);
/* Loop for multiple addresses in the header, enabling group syntax. Note
that we have to reset this after the header has been scanned. */
- parse_allow_group = TRUE;
+ f.parse_allow_group = TRUE;
- while (*s != 0)
+ while (*s)
{
uschar *ss = parse_find_address_end(s, FALSE);
uschar *recipient, *errmess;
/* Permit an unqualified address only if the message is local, or if the
sending host is configured to be permitted to send them. */
- if (recipient != NULL && domain == 0)
+ if (recipient && !domain)
{
if (h->type == htype_from || h->type == htype_sender)
{
- if (!allow_unqualified_sender) recipient = NULL;
+ if (!f.allow_unqualified_sender) recipient = NULL;
}
else
{
- if (!allow_unqualified_recipient) recipient = NULL;
+ if (!f.allow_unqualified_recipient) recipient = NULL;
}
- if (recipient == NULL) errmess = US"unqualified address not permitted";
+ if (!recipient) errmess = US"unqualified address not permitted";
}
/* It's an error if no address could be extracted, except for the special
case of an empty address. */
- if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
+ if (!recipient && Ustrcmp(errmess, "empty address") != 0)
{
uschar *verb = US"is";
uschar *t = ss;
/* deconst cast ok as we're passing a non-const to string_printing() */
*msgptr = US string_printing(
string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s",
- errmess, tt - h->text, h->text, verb, len, s));
+ errmess, (int)(tt - h->text), h->text, verb, len, s));
yield = FAIL;
break; /* Out of address loop */
/* Advance to the next address */
- s = ss + (terminator? 1:0);
- while (isspace(*s)) s++;
+ s = ss + (terminator ? 1 : 0);
+ Uskip_whitespace(&s);
} /* Next address */
- parse_allow_group = FALSE;
- parse_found_group = FALSE;
+ f.parse_allow_group = FALSE;
+ f.parse_found_group = FALSE;
} /* Next header unless yield has been set FALSE */
return yield;
* Check header names for 8-bit characters *
*************************************************/
-/* This function checks for invalid charcters in header names. See
+/* This function checks for invalid characters in header names. See
RFC 5322, 2.2. and RFC 6532, 3.
Arguments:
int
verify_check_header_names_ascii(uschar **msgptr)
{
-header_line *h;
-uschar *colon, *s;
+uschar *colon;
-for (h = header_list; h != NULL; h = h->next)
+for (header_line * h = header_list; h; h = h->next)
{
- colon = Ustrchr(h->text, ':');
- for(s = h->text; s < colon; s++)
- {
- if ((*s < 33) || (*s > 126))
- {
- *msgptr = string_sprintf("Invalid character in header \"%.*s\" found",
- colon - h->text, h->text);
- return FAIL;
- }
- }
+ colon = Ustrchr(h->text, ':');
+ for(uschar * s = h->text; s < colon; s++)
+ if ((*s < 33) || (*s > 126))
+ {
+ *msgptr = string_sprintf("Invalid character in header \"%.*s\" found",
+ (int)(colon - h->text), h->text);
+ return FAIL;
+ }
}
return OK;
}
because (a) it requires no memory and (b) will use fewer resources when there
are many addresses in To: and/or Cc: and only one or two envelope recipients.
-Arguments: none
+Arguments: case_sensitive true if case sensitive matching should be used
Returns: OK if there are no blind recipients
FAIL if there is at least one blind recipient
*/
int
-verify_check_notblind(void)
+verify_check_notblind(BOOL case_sensitive)
{
-int i;
-for (i = 0; i < recipients_count; i++)
+for (int i = 0; i < recipients_count; i++)
{
- header_line *h;
BOOL found = FALSE;
uschar *address = recipients_list[i].address;
- for (h = header_list; !found && h != NULL; h = h->next)
+ for (header_line * h = header_list; !found && h; h = h->next)
{
uschar *colon, *s;
colon = Ustrchr(h->text, ':');
s = colon + 1;
- while (isspace(*s)) s++;
+ Uskip_whitespace(&s);
/* Loop for multiple addresses in the header, enabling group syntax. Note
that we have to reset this after the header has been scanned. */
- parse_allow_group = TRUE;
+ f.parse_allow_group = TRUE;
- while (*s != 0)
+ while (*s)
{
- uschar *ss = parse_find_address_end(s, FALSE);
- uschar *recipient,*errmess;
+ uschar * ss = parse_find_address_end(s, FALSE);
+ uschar * recipient, * errmess;
int terminator = *ss;
int start, end, domain;
*ss = terminator;
/* If we found a valid recipient that has a domain, compare it with the
- envelope recipient. Local parts are compared case-sensitively, domains
- case-insensitively. By comparing from the start with length "domain", we
- include the "@" at the end, which ensures that we are comparing the whole
- local part of each address. */
-
- if (recipient != NULL && domain != 0)
- {
- found = Ustrncmp(recipient, address, domain) == 0 &&
- strcmpic(recipient + domain, address + domain) == 0;
- if (found) break;
- }
+ envelope recipient. Local parts are compared with case-sensitivity
+ according to the routine arg, domains case-insensitively.
+ By comparing from the start with length "domain", we include the "@" at
+ the end, which ensures that we are comparing the whole local part of each
+ address. */
+
+ if (recipient && domain != 0)
+ if ((found = (case_sensitive
+ ? Ustrncmp(recipient, address, domain) == 0
+ : strncmpic(recipient, address, domain) == 0)
+ && strcmpic(recipient + domain, address + domain) == 0))
+ break;
/* Advance to the next address */
- s = ss + (terminator? 1:0);
- while (isspace(*s)) s++;
+ s = ss + (terminator ? 1:0);
+ Uskip_whitespace(&s);
} /* Next address */
- parse_allow_group = FALSE;
- parse_found_group = FALSE;
+ f.parse_allow_group = FALSE;
+ f.parse_found_group = FALSE;
} /* Next header (if found is false) */
if (!found) return FAIL;
address_item *
verify_checked_sender(uschar *sender)
{
-address_item *addr;
-for (addr = sender_verified_list; addr != NULL; addr = addr->next)
- if (Ustrcmp(sender, addr->address) == 0) break;
-return addr;
+for (address_item * addr = sender_verified_list; addr; addr = addr->next)
+ if (Ustrcmp(sender, addr->address) == 0) return addr;
+return NULL;
}
static int header_types[] = { htype_sender, htype_reply_to, htype_from };
BOOL done = FALSE;
int yield = FAIL;
-int i;
-for (i = 0; i < 3 && !done; i++)
- {
- header_line *h;
- for (h = header_list; h != NULL && !done; h = h->next)
+for (int i = 0; i < 3 && !done; i++)
+ for (header_line * h = header_list; h != NULL && !done; h = h->next)
{
int terminator, new_ok;
uschar *s, *ss, *endname;
/* Scan the addresses in the header, enabling group syntax. Note that we
have to reset this after the header has been scanned. */
- parse_allow_group = TRUE;
+ f.parse_allow_group = TRUE;
while (*s != 0)
{
/* If we found an empty address, just carry on with the next one, but
kill the message. */
- if (address == NULL && Ustrcmp(*log_msgptr, "empty address") == 0)
+ if (!address && Ustrcmp(*log_msgptr, "empty address") == 0)
{
*log_msgptr = NULL;
s = ss;
function, and ensure that the failing address gets added to the error
message. */
- if (address == NULL)
+ if (!address)
{
new_ok = FAIL;
while (ss > s && isspace(ss[-1])) ss--;
*log_msgptr = string_sprintf("syntax error in '%.*s' header when "
"scanning for sender: %s in \"%.*s\"",
- endname - h->text, h->text, *log_msgptr, ss - s, s);
+ (int)(endname - h->text), h->text, *log_msgptr, (int)(ss - s), s);
yield = FAIL;
done = TRUE;
break;
{
*verrno = vaddr->basic_errno;
if (smtp_return_error_details)
- {
*user_msgptr = string_sprintf("Rejected after DATA: "
"could not verify \"%.*s\" header address\n%s: %s",
- endname - h->text, h->text, vaddr->address, vaddr->message);
- }
+ (int)(endname - h->text), h->text, vaddr->address, vaddr->message);
}
/* Success or defer */
s = ss;
} /* Next address */
- parse_allow_group = FALSE;
- parse_found_group = FALSE;
+ f.parse_allow_group = FALSE;
+ f.parse_found_group = FALSE;
} /* Next header, unless done */
- } /* Next header type unless done */
+ /* Next header type unless done */
if (yield == FAIL && *log_msgptr == NULL)
*log_msgptr = US"there is no valid sender in any header line";
void
verify_get_ident(int port)
{
-int sock, host_af, qlen;
+client_conn_ctx ident_conn_ctx = {0};
+int host_af, qlen;
int received_sender_port, received_interface_port, n;
uschar *p;
+blob early_data;
uschar buffer[2048];
/* Default is no ident. Check whether we want to do an ident check for this
to the incoming interface address. If the sender host address is an IPv6
address, the incoming interface address will also be IPv6. */
-host_af = (Ustrchr(sender_host_address, ':') == NULL)? AF_INET : AF_INET6;
-sock = ip_socket(SOCK_STREAM, host_af);
-if (sock < 0) return;
+host_af = Ustrchr(sender_host_address, ':') == NULL ? AF_INET : AF_INET6;
+if ((ident_conn_ctx.sock = ip_socket(SOCK_STREAM, host_af)) < 0) return;
-if (ip_bind(sock, host_af, interface_address, 0) < 0)
+if (ip_bind(ident_conn_ctx.sock, host_af, interface_address, 0) < 0)
{
DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n",
strerror(errno));
goto END_OFF;
}
-if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout)
- < 0)
+/* Construct and send the query. */
+
+qlen = snprintf(CS buffer, sizeof(buffer), "%d , %d\r\n",
+ sender_host_port, interface_port);
+early_data.data = buffer;
+early_data.len = qlen;
+
+/*XXX we trust that the query is idempotent */
+if (ip_connect(ident_conn_ctx.sock, host_af, sender_host_address, port,
+ rfc1413_query_timeout, &early_data) < 0)
{
- if (errno == ETIMEDOUT && (log_extra_selector & LX_ident_timeout) != 0)
- {
+ if (errno == ETIMEDOUT && LOGGING(ident_timeout))
log_write(0, LOG_MAIN, "ident connection to %s timed out",
sender_host_address);
- }
else
- {
DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n",
sender_host_address, strerror(errno));
- }
- goto END_OFF;
- }
-
-/* Construct and send the query. */
-
-sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port);
-qlen = Ustrlen(buffer);
-if (send(sock, buffer, qlen, 0) < 0)
- {
- DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno));
goto END_OFF;
}
int size = sizeof(buffer) - (p - buffer);
if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */
- count = ip_recv(sock, p, size, rfc1413_query_timeout);
+ count = ip_recv(&ident_conn_ctx, p, size, time(NULL) + rfc1413_query_timeout);
if (count <= 0) goto END_OFF; /* Read error or EOF */
/* Scan what we just read, to see if we have reached the terminating \r\n. Be
DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident);
END_OFF:
-(void)close(sock);
+(void)close(ident_conn_ctx.sock);
return;
}
*/
int
-check_host(void *arg, const uschar *ss, const uschar **valueptr, uschar **error)
+check_host(void * arg, const uschar * ss, const uschar ** valueptr, uschar ** error)
{
-check_host_block *cb = (check_host_block *)arg;
+check_host_block * cb = (check_host_block *)arg;
int mlen = -1;
int maskoffset;
-BOOL iplookup = FALSE;
-BOOL isquery = FALSE;
-BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0;
-const uschar *t;
-uschar *semicolon;
-uschar **aliases;
+BOOL iplookup = FALSE, isquery = FALSE;
+BOOL isiponly = cb->host_name && !cb->host_name[0];
+const uschar * t;
+uschar * semicolon, * endname, * opts;
+uschar ** aliases;
/* Optimize for the special case when the pattern is "*". */
-if (*ss == '*' && ss[1] == 0) return OK;
+if (*ss == '*' && !ss[1]) return OK;
/* If the pattern is empty, it matches only in the case when there is no host -
this can occur in ACL checking for SMTP input using the -bs option. In this
situation, the host address is the empty string. */
-if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL;
-if (*ss == 0) return FAIL;
+if (!cb->host_address[0]) return *ss ? FAIL : OK;
+if (!*ss) return FAIL;
/* If the pattern is precisely "@" then match against the primary host name,
provided that host name matching is permitted; if it's "@[]" match against the
local host's IP addresses. */
if (*ss == '@')
- {
if (ss[1] == 0)
{
if (isiponly) return ERROR;
}
else if (Ustrcmp(ss, "@[]") == 0)
{
- ip_address_item *ip;
- for (ip = host_find_interfaces(); ip != NULL; ip = ip->next)
+ for (ip_address_item * ip = host_find_interfaces(); ip; ip = ip->next)
if (Ustrcmp(ip->address, cb->host_address) == 0) return OK;
return FAIL;
}
- }
/* If the pattern is an IP address, optionally followed by a bitmask count, do
-a (possibly masked) comparision with the current IP address. */
+a (possibly masked) comparison with the current IP address. */
if (string_is_ip_address(ss, &maskoffset) != 0)
return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL);
course slashes may be present in lookups, but not preceded only by digits and
dots). */
-for (t = ss; isdigit(*t) || *t == '.'; t++);
-if (*t == 0 || (*t == '/' && t != ss))
+for (t = ss; isdigit(*t) || *t == '.'; ) t++;
+if (!*t || (*t == '/' && t != ss))
{
*error = US"malformed IPv4 address or address mask";
return ERROR;
}
-/* See if there is a semicolon in the pattern */
+/* See if there is a semicolon in the pattern, separating a searchtype
+prefix. If there is one then check for comma-sep options. */
-semicolon = Ustrchr(ss, ';');
+if ((semicolon = Ustrchr(ss, ';')))
+ if ((opts = Ustrchr(ss, ',')) && opts < semicolon)
+ {
+ endname = opts++;
+ opts = string_copyn(opts, semicolon - opts);
+ }
+ else
+ {
+ endname = semicolon;
+ opts = NULL;
+ }
/* If we are doing an IP address only match, then all lookups must be IP
address lookups, even if there is no "net-". */
if (isiponly)
- {
iplookup = semicolon != NULL;
- }
/* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
a lookup on a masked IP network, in textual form. We obey this code even if we
From release 4.30, the use of net- for query style is no longer needed, but we
retain it for backward compatibility. */
-if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL)
+if (Ustrncmp(ss, "net", 3) == 0 && semicolon)
{
mlen = 0;
for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */
- iplookup = (*t++ == '-');
+ iplookup = *t++ == '-';
}
-else t = ss;
+else
+ t = ss;
/* Do the IP address lookup if that is indeed what we have */
/* Find the search type */
- search_type = search_findtype(t, semicolon - t);
+ search_type = search_findtype(t, endname - t);
if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
search_error_message);
/* Now do the actual lookup; note that there is no search_close() because
of the caching arrangements. */
- handle = search_open(filename, search_type, 0, NULL, NULL);
- if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
- search_error_message);
- result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL);
- if (valueptr != NULL) *valueptr = result;
- return (result != NULL)? OK : search_find_defer? DEFER: FAIL;
+ if (!(handle = search_open(filename, search_type, 0, NULL, NULL)))
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", search_error_message);
+
+ result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL, opts);
+ if (valueptr) *valueptr = result;
+ return result ? OK : f.search_find_defer ? DEFER: FAIL;
}
/* The pattern is not an IP address or network reference of any kind. That is,
underscores, as they are all too commonly found. Sigh. Also, if
allow_utf8_domains is set, allow top-bit characters. */
-for (t = ss; *t != 0; t++)
+for (t = ss; *t; t++)
if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' &&
(!allow_utf8_domains || *t < 128)) break;
its IP address and match against that. Note that a multi-homed host will add
items to the chain. */
-if (*t == 0)
+if (!*t)
{
int rc;
host_item h;
h.address = NULL;
h.mx = MX_NONE;
+ /* Using byname rather than bydns here means we cannot determine dnssec
+ status. On the other hand it is unclear how that could be either
+ propagated up or enforced. */
+
rc = host_find_byname(&h, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, FALSE);
if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
{
- host_item *hh;
- for (hh = &h; hh != NULL; hh = hh->next)
- {
+ for (host_item * hh = &h; hh; hh = hh->next)
if (host_is_in_net(hh->address, cb->host_address, 0)) return OK;
- }
return FAIL;
}
if (rc == HOST_FIND_AGAIN) return DEFER;
outgoing hosts, the name is always given explicitly. If it is NULL, it means we
must use sender_host_name and its aliases, looking them up if necessary. */
-if (cb->host_name != NULL) /* Explicit host name given */
- return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE,
- valueptr);
+if (cb->host_name) /* Explicit host name given */
+ return match_check_string(cb->host_name, ss, -1,
+ MCS_PARTIAL | MCS_CASELESS | MCS_AT_SPECIAL | cb->flags, valueptr);
/* Host name not given; in principle we need the sender host name and its
aliases. However, for query-style lookups, we do not need the name if the
$sender_host_name causes it to be looked up, so we don't need to do the lookup
on spec. */
-if ((semicolon = Ustrchr(ss, ';')) != NULL)
+if ((semicolon = Ustrchr(ss, ';')))
{
- const uschar *affix;
+ const uschar * affix, * opts;
int partial, affixlen, starflags, id;
*semicolon = 0;
- id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags);
+ id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags,
+ &opts);
*semicolon=';';
if (id < 0) /* Unknown lookup type */
if (isquery)
{
- switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr))
+ switch(match_check_string(US"", ss, -1,
+ MCS_PARTIAL| MCS_CASELESS| MCS_AT_SPECIAL | (cb->flags & MCS_CACHEABLE),
+ valueptr))
{
case OK: return OK;
case DEFER: return DEFER;
/* Not a query-style lookup; must ensure the host name is present, and then we
do a check on the name and all its aliases. */
-if (sender_host_name == NULL)
+if (!sender_host_name)
{
HDEBUG(D_host_lookup)
debug_printf("sender host name required, to match against %s\n", ss);
/* Match on the sender host name, using the general matching function */
-switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE,
- valueptr))
+switch(match_check_string(sender_host_name, ss, -1,
+ MCS_PARTIAL| MCS_CASELESS| MCS_AT_SPECIAL | (cb->flags & MCS_CACHEABLE),
+ valueptr))
{
case OK: return OK;
case DEFER: return DEFER;
/* If there are aliases, try matching on them. */
aliases = sender_host_aliases;
-while (*aliases != NULL)
- {
- switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr))
+while (*aliases)
+ switch(match_check_string(*aliases++, ss, -1,
+ MCS_PARTIAL| MCS_CASELESS| MCS_AT_SPECIAL | (cb->flags & MCS_CACHEABLE),
+ valueptr))
{
case OK: return OK;
case DEFER: return DEFER;
}
- }
return FAIL;
}
int rc;
unsigned int *local_cache_bits = cache_bits;
const uschar *save_host_address = deliver_host_address;
-check_host_block cb;
-cb.host_name = host_name;
-cb.host_address = host_address;
+check_host_block cb = { .host_name = host_name, .host_address = host_address };
-if (valueptr != NULL) *valueptr = NULL;
+if (valueptr) *valueptr = NULL;
/* If the host address starts off ::ffff: it is an IPv6 address in
IPv4-compatible mode. Find the IPv4 part for checking against IPv4
addresses. */
-cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)?
- host_address + 7 : host_address;
+cb.host_ipv4 = Ustrncmp(host_address, "::ffff:", 7) == 0
+ ? host_address + 7 : host_address;
/* During the running of the check, put the IP address into $host_address. In
the case of calls from the smtp transport, it will already be there. However,
check_host, /* function for testing */
&cb, /* argument for function */
MCL_HOST, /* type of check */
- (host_address == sender_host_address)?
- US"host" : host_address, /* text for debugging */
+ host_address == sender_host_address
+ ? US"host" : host_address, /* text for debugging */
valueptr); /* where to pass back data */
deliver_host_address = save_host_address;
return rc;
* Check the given host item matches a list *
*************************************************/
int
-verify_check_given_host(uschar **listptr, host_item *host)
+verify_check_given_host(const uschar **listptr, const host_item *host)
{
-return verify_check_this_host(CUSS listptr, NULL, host->name, host->address, NULL);
+return verify_check_this_host(listptr, NULL, host->name, host->address, NULL);
}
/*************************************************
verify_check_host(uschar **listptr)
{
return verify_check_this_host(CUSS listptr, sender_host_cache, NULL,
- (sender_host_address == NULL)? US"" : sender_host_address, NULL);
+ sender_host_address ? sender_host_address : US"", NULL);
}
if (host_aton(address, bin) == 1)
{
- int i;
int x = bin[0];
- for (i = 0; i < 4; i++)
+ for (int i = 0; i < 4; i++)
{
sprintf(CS bptr, "%d.", x & 255);
while (*bptr) bptr++;
#if HAVE_IPV6
else
- {
- int i, j;
- for (j = 3; j >= 0; j--)
+ for (int j = 3; j >= 0; j--)
{
int x = bin[j];
- for (i = 0; i < 8; i++)
+ for (int i = 0; i < 8; i++)
{
sprintf(CS bptr, "%x.", x & 15);
while (*bptr) bptr++;
x >>= 4;
}
}
- }
#endif
/* Remove trailing period -- this is needed so that both arbitrary
-/*************************************************
-* Perform a single dnsbl lookup *
-*************************************************/
-
-/* This function is called from verify_check_dnsbl() below. It is also called
-recursively from within itself when domain and domain_txt are different
-pointers, in order to get the TXT record from the alternate domain.
-
-Arguments:
- domain the outer dnsbl domain
- domain_txt alternate domain to lookup TXT record on success; when the
- same domain is to be used, domain_txt == domain (that is,
- the pointers must be identical, not just the text)
- keydomain the current keydomain (for debug message)
- prepend subdomain to lookup (like keydomain, but
- reversed if IP address)
- iplist the list of matching IP addresses, or NULL for "any"
- bitmask true if bitmask matching is wanted
- match_type condition for 'succeed' result
- 0 => Any RR in iplist (=)
- 1 => No RR in iplist (!=)
- 2 => All RRs in iplist (==)
- 3 => Some RRs not in iplist (!==)
- the two bits are defined as MT_NOT and MT_ALL
- defer_return what to return for a defer
-
-Returns: OK if lookup succeeded
- FAIL if not
-*/
-
-static int
-one_check_dnsbl(uschar *domain, uschar *domain_txt, uschar *keydomain,
- uschar *prepend, uschar *iplist, BOOL bitmask, int match_type,
- int defer_return)
-{
-dns_answer dnsa;
-dns_scan dnss;
-tree_node *t;
-dnsbl_cache_block *cb;
-int old_pool = store_pool;
-uschar query[256]; /* DNS domain max length */
+/****************************************************
+ Verify a local user account for quota sufficiency
+****************************************************/
-/* Construct the specific query domainname */
+/* The real work, done via a re-exec for privs, calls
+down to the transport for the quota check.
-if (!string_format(query, sizeof(query), "%s.%s", prepend, domain))
- {
- log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
- "(ignored): %s...", query);
- return FAIL;
- }
+Route and transport (in recipient-verify mode) the
+given recipient.
-/* Look for this query in the cache. */
+A routing result indicating any transport type other than appendfile
+results in a fail.
-t = tree_search(dnsbl_cache, query);
+Return, on stdout, a result string containing:
+- highlevel result code (OK, DEFER, FAIL)
+- errno
+- where string
+- message string
+*/
-/* If not cached from a previous lookup, we must do a DNS lookup, and
-cache the result in permanent memory. */
+void
+verify_quota(uschar * address)
+{
+address_item vaddr = {.address = address};
+BOOL routed;
+uschar * msg = US"\0";
+int rc, len = 1;
-if (t == NULL)
+if ((rc = verify_address(&vaddr, NULL, vopt_is_recipient | vopt_quota,
+ 1, 0, 0, NULL, NULL, &routed)) != OK)
{
- store_pool = POOL_PERM;
-
- /* Set up a tree entry to cache the lookup */
-
- t = store_get(sizeof(tree_node) + Ustrlen(query));
- Ustrcpy(t->name, query);
- t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block));
- (void)tree_insertnode(&dnsbl_cache, t);
-
- /* Do the DNS loopup . */
-
- HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query);
- cb->rc = dns_basic_lookup(&dnsa, query, T_A);
- cb->text_set = FALSE;
- cb->text = NULL;
- cb->rhs = NULL;
-
- /* If the lookup succeeded, cache the RHS address. The code allows for
- more than one address - this was for complete generality and the possible
- use of A6 records. However, A6 records have been reduced to experimental
- status (August 2001) and may die out. So they may never get used at all,
- let alone in dnsbl records. However, leave the code here, just in case.
-
- Quite apart from one A6 RR generating multiple addresses, there are DNS
- lists that return more than one A record, so we must handle multiple
- addresses generated in that way as well. */
-
- if (cb->rc == DNS_SUCCEED)
+ uschar * where = recipient_verify_failure;
+ msg = acl_verify_message ? acl_verify_message : vaddr.message;
+ if (!msg) msg = US"";
+ if (rc == DEFER && vaddr.basic_errno == ERRNO_EXIMQUOTA)
{
- dns_record *rr;
- dns_address **addrp = &(cb->rhs);
- for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
- {
- if (rr->type == T_A)
- {
- dns_address *da = dns_address_from_rr(&dnsa, rr);
- if (da != NULL)
- {
- *addrp = da;
- while (da->next != NULL) da = da->next;
- addrp = &(da->next);
- }
- }
- }
-
- /* If we didn't find any A records, change the return code. This can
- happen when there is a CNAME record but there are no A records for what
- it points to. */
-
- if (cb->rhs == NULL) cb->rc = DNS_NODATA;
+ rc = FAIL; /* DEFER -> FAIL */
+ where = US"quota";
+ vaddr.basic_errno = 0;
}
+ else if (!where) where = US"";
- store_pool = old_pool;
- }
-
-/* Previous lookup was cached */
-
-else
- {
- HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
- cb = t->data.ptr;
+ len = 5 + Ustrlen(msg) + 1 + Ustrlen(where);
+ msg = string_sprintf("%c%c%c%c%c%s%c%s", (uschar)rc,
+ (vaddr.basic_errno >> 24) & 0xff, (vaddr.basic_errno >> 16) & 0xff,
+ (vaddr.basic_errno >> 8) & 0xff, vaddr.basic_errno & 0xff,
+ where, '\0', msg);
}
-/* We now have the result of the DNS lookup, either newly done, or cached
-from a previous call. If the lookup succeeded, check against the address
-list if there is one. This may be a positive equality list (introduced by
-"="), a negative equality list (introduced by "!="), a positive bitmask
-list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/
-
-if (cb->rc == DNS_SUCCEED)
- {
- dns_address *da = NULL;
- uschar *addlist = cb->rhs->address;
-
- /* For A and AAAA records, there may be multiple addresses from multiple
- records. For A6 records (currently not expected to be used) there may be
- multiple addresses from a single record. */
-
- for (da = cb->rhs->next; da != NULL; da = da->next)
- addlist = string_sprintf("%s, %s", addlist, da->address);
-
- HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n",
- query, addlist);
-
- /* Address list check; this can be either for equality, or via a bitmask.
- In the latter case, all the bits must match. */
-
- if (iplist != NULL)
- {
- for (da = cb->rhs; da != NULL; da = da->next)
- {
- int ipsep = ',';
- uschar ip[46];
- const uschar *ptr = iplist;
- uschar *res;
-
- /* Handle exact matching */
-
- if (!bitmask)
- {
- while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL)
- {
- if (Ustrcmp(CS da->address, ip) == 0) break;
- }
- }
-
- /* Handle bitmask matching */
-
- else
- {
- int address[4];
- int mask = 0;
-
- /* At present, all known DNS blocking lists use A records, with
- IPv4 addresses on the RHS encoding the information they return. I
- wonder if this will linger on as the last vestige of IPv4 when IPv6
- is ubiquitous? Anyway, for now we use paranoia code to completely
- ignore IPv6 addresses. The default mask is 0, which always matches.
- We change this only for IPv4 addresses in the list. */
-
- if (host_aton(da->address, address) == 1) mask = address[0];
-
- /* Scan the returned addresses, skipping any that are IPv6 */
-
- while ((res = string_nextinlist(&ptr, &ipsep, ip, sizeof(ip))) != NULL)
- {
- if (host_aton(ip, address) != 1) continue;
- if ((address[0] & mask) == address[0]) break;
- }
- }
-
- /* If either
-
- (a) An IP address in an any ('=') list matched, or
- (b) No IP address in an all ('==') list matched
-
- then we're done searching. */
-
- if (((match_type & MT_ALL) != 0) == (res == NULL)) break;
- }
-
- /* If da == NULL, either
-
- (a) No IP address in an any ('=') list matched, or
- (b) An IP address in an all ('==') list didn't match
-
- so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on
- the list. */
-
- if ((match_type == MT_NOT || match_type == MT_ALL) != (da == NULL))
- {
- HDEBUG(D_dnsbl)
- {
- uschar *res = NULL;
- switch(match_type)
- {
- case 0:
- res = US"was no match";
- break;
- case MT_NOT:
- res = US"was an exclude match";
- break;
- case MT_ALL:
- res = US"was an IP address that did not match";
- break;
- case MT_NOT|MT_ALL:
- res = US"were no IP addresses that did not match";
- break;
- }
- debug_printf("=> but we are not accepting this block class because\n");
- debug_printf("=> there %s for %s%c%s\n",
- res,
- ((match_type & MT_ALL) == 0)? "" : "=",
- bitmask? '&' : '=', iplist);
- }
- return FAIL;
- }
- }
-
- /* Either there was no IP list, or the record matched, implying that the
- domain is on the list. We now want to find a corresponding TXT record. If an
- alternate domain is specified for the TXT record, call this function
- recursively to look that up; this has the side effect of re-checking that
- there is indeed an A record at the alternate domain. */
-
- if (domain_txt != domain)
- return one_check_dnsbl(domain_txt, domain_txt, keydomain, prepend, NULL,
- FALSE, match_type, defer_return);
+DEBUG(D_verify) debug_printf_indent("verify_quota: len %d\n", len);
+write(1, msg, len);
+return;
+}
- /* If there is no alternate domain, look up a TXT record in the main domain
- if it has not previously been cached. */
- if (!cb->text_set)
- {
- cb->text_set = TRUE;
- if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED)
- {
- dns_record *rr;
- for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
- if (rr->type == T_TXT) break;
- if (rr != NULL)
- {
- int len = (rr->data)[0];
- if (len > 511) len = 127;
- store_pool = POOL_PERM;
- cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1));
- store_pool = old_pool;
- }
- }
- }
+/******************************************************************************/
- dnslist_value = addlist;
- dnslist_text = cb->text;
- return OK;
- }
+/* Quota cache lookup. We use the callout hints db also for the quota cache.
+Return TRUE if a nonexpired record was found, having filled in the yield
+argument.
+*/
-/* There was a problem with the DNS lookup */
+static BOOL
+cached_quota_lookup(const uschar * rcpt, int * yield,
+ int pos_cache, int neg_cache)
+{
+open_db dbblock, *dbm_file = NULL;
+dbdata_callout_cache_address * cache_address_record;
-if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA)
+if (!pos_cache && !neg_cache)
+ return FALSE;
+if (!(dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE, TRUE)))
{
- log_write(L_dnslist_defer, LOG_MAIN,
- "DNS list lookup defer (probably timeout) for %s: %s", query,
- (defer_return == OK)? US"assumed in list" :
- (defer_return == FAIL)? US"assumed not in list" :
- US"returned DEFER");
- return defer_return;
+ HDEBUG(D_verify) debug_printf_indent("quota cache: not available\n");
+ return FALSE;
}
-
-/* No entry was found in the DNS; continue for next domain */
-
-HDEBUG(D_dnsbl)
+if (!(cache_address_record = (dbdata_callout_cache_address *)
+ get_callout_cache_record(dbm_file, rcpt, US"address",
+ pos_cache, neg_cache)))
{
- debug_printf("DNS lookup for %s failed\n", query);
- debug_printf("=> that means %s is not listed at %s\n",
- keydomain, domain);
+ dbfn_close(dbm_file);
+ return FALSE;
}
-
-return FAIL;
+if (cache_address_record->result == ccache_accept)
+ *yield = OK;
+dbfn_close(dbm_file);
+return TRUE;
}
+/* Quota cache write */
+static void
+cache_quota_write(const uschar * rcpt, int yield, int pos_cache, int neg_cache)
+{
+open_db dbblock, *dbm_file = NULL;
+dbdata_callout_cache_address cache_address_record;
+if (!pos_cache && !neg_cache)
+ return;
+if (!(dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE, TRUE)))
+ {
+ HDEBUG(D_verify) debug_printf_indent("quota cache: not available\n");
+ return;
+ }
-/*************************************************
-* Check host against DNS black lists *
-*************************************************/
-
-/* This function runs checks against a list of DNS black lists, until one
-matches. Each item on the list can be of the form
-
- domain=ip-address/key
-
-The domain is the right-most domain that is used for the query, for example,
-blackholes.mail-abuse.org. If the IP address is present, there is a match only
-if the DNS lookup returns a matching IP address. Several addresses may be
-given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2.
-
-If no key is given, what is looked up in the domain is the inverted IP address
-of the current client host. If a key is given, it is used to construct the
-domain for the lookup. For example:
-
- dsn.rfc-ignorant.org/$sender_address_domain
-
-After finding a match in the DNS, the domain is placed in $dnslist_domain, and
-then we check for a TXT record for an error message, and if found, save its
-value in $dnslist_text. We also cache everything in a tree, to optimize
-multiple lookups.
+cache_address_record.result = yield == OK ? ccache_accept : ccache_reject;
-The TXT record is normally looked up in the same domain as the A record, but
-when many lists are combined in a single DNS domain, this will not be a very
-specific message. It is possible to specify a different domain for looking up
-TXT records; this is given before the main domain, comma-separated. For
-example:
+(void)dbfn_write(dbm_file, rcpt, &cache_address_record,
+ (int)sizeof(dbdata_callout_cache_address));
+HDEBUG(D_verify) debug_printf_indent("wrote %s quota cache record for %s\n",
+ yield == OK ? "positive" : "negative", rcpt);
- dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \
- socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3
+dbfn_close(dbm_file);
+return;
+}
-The caching ensures that only one lookup in dnsbl.sorbs.net is done.
-Note: an address for testing RBL is 192.203.178.39
-Note: an address for testing DUL is 192.203.178.4
-Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org
+/* To evaluate a local user's quota, starting in ACL, we need to
+fork & exec to regain privileges, to that we can change to the user's
+identity for access to their files.
Arguments:
- listptr the domain/address/data list
+ rcpt Recipient account
+ pos_cache Number of seconds to cache a positive result (delivery
+ to be accepted). Zero to disable caching.
+ neg_cache Number of seconds to cache a negative result. Zero to disable.
+ msg Pointer to result string pointer
-Returns: OK successful lookup (i.e. the address is on the list), or
- lookup deferred after +include_unknown
- FAIL name not found, or no data found for the given type, or
- lookup deferred after +exclude_unknown (default)
- DEFER lookup failure, if +defer_unknown was set
+Return: OK/DEFER/FAIL code
*/
int
-verify_check_dnsbl(const uschar **listptr)
+verify_quota_call(const uschar * rcpt, int pos_cache, int neg_cache,
+ uschar ** msg)
{
-int sep = 0;
-int defer_return = FAIL;
-const uschar *list = *listptr;
-uschar *domain;
-uschar *s;
-uschar buffer[1024];
-uschar revadd[128]; /* Long enough for IPv6 address */
-
-/* Indicate that the inverted IP address is not yet set up */
+int pfd[2], pid, save_errno, yield = FAIL;
+void (*oldsignal)(int);
+const uschar * where = US"socketpair";
-revadd[0] = 0;
+*msg = NULL;
-/* In case this is the first time the DNS resolver is being used. */
-
-dns_init(FALSE, FALSE, FALSE); /*XXX dnssec? */
-
-/* Loop through all the domains supplied, until something matches */
-
-while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
+if (cached_quota_lookup(rcpt, &yield, pos_cache, neg_cache))
{
- int rc;
- BOOL bitmask = FALSE;
- int match_type = 0;
- uschar *domain_txt;
- uschar *comma;
- uschar *iplist;
- uschar *key;
-
- HDEBUG(D_dnsbl) debug_printf("DNS list check: %s\n", domain);
-
- /* Deal with special values that change the behaviour on defer */
-
- if (domain[0] == '+')
- {
- if (strcmpic(domain, US"+include_unknown") == 0) defer_return = OK;
- else if (strcmpic(domain, US"+exclude_unknown") == 0) defer_return = FAIL;
- else if (strcmpic(domain, US"+defer_unknown") == 0) defer_return = DEFER;
- else
- log_write(0, LOG_MAIN|LOG_PANIC, "unknown item in dnslist (ignored): %s",
- domain);
- continue;
- }
-
- /* See if there's explicit data to be looked up */
-
- key = Ustrchr(domain, '/');
- if (key != NULL) *key++ = 0;
-
- /* See if there's a list of addresses supplied after the domain name. This is
- introduced by an = or a & character; if preceded by = we require all matches
- and if preceded by ! we invert the result. */
-
- iplist = Ustrchr(domain, '=');
- if (iplist == NULL)
+ HDEBUG(D_verify) debug_printf_indent("quota cache: address record is %s\n",
+ yield == OK ? "positive" : "negative");
+ if (yield != OK)
{
- bitmask = TRUE;
- iplist = Ustrchr(domain, '&');
+ recipient_verify_failure = US"quota";
+ acl_verify_message = *msg =
+ US"Previous (cached) quota verification failure";
}
+ return yield;
+ }
- if (iplist != NULL) /* Found either = or & */
- {
- if (iplist > domain && iplist[-1] == '!') /* Handle preceding ! */
- {
- match_type |= MT_NOT;
- iplist[-1] = 0;
- }
-
- *iplist++ = 0; /* Terminate domain, move on */
-
- /* If we found = (bitmask == FALSE), check for == or =& */
+if (pipe(pfd) != 0)
+ goto fail;
- if (!bitmask && (*iplist == '=' || *iplist == '&'))
- {
- bitmask = *iplist++ == '&';
- match_type |= MT_ALL;
- }
- }
+where = US"fork";
+oldsignal = signal(SIGCHLD, SIG_DFL);
+if ((pid = exim_fork(US"quota-verify")) < 0)
+ {
+ save_errno = errno;
+ close(pfd[pipe_write]);
+ close(pfd[pipe_read]);
+ errno = save_errno;
+ goto fail;
+ }
- /* If there is a comma in the domain, it indicates that a second domain for
- looking up TXT records is provided, before the main domain. Otherwise we must
- set domain_txt == domain. */
+if (pid == 0) /* child */
+ {
+ close(pfd[pipe_read]);
+ force_fd(pfd[pipe_write], 1); /* stdout to pipe */
+ close(pfd[pipe_write]);
+ dup2(1, 0);
+ if (debug_fd > 0) force_fd(debug_fd, 2);
+
+ child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 3,
+ US"-MCq", string_sprintf("%d", message_size), rcpt);
+ /*NOTREACHED*/
+ }
- domain_txt = domain;
- comma = Ustrchr(domain, ',');
- if (comma != NULL)
- {
- *comma++ = 0;
- domain = comma;
- }
+save_errno = errno;
+close(pfd[pipe_write]);
- /* Check that what we have left is a sensible domain name. There is no reason
- why these domains should in fact use the same syntax as hosts and email
- domains, but in practice they seem to. However, there is little point in
- actually causing an error here, because that would no doubt hold up incoming
- mail. Instead, I'll just log it. */
+if (pid < 0)
+ {
+ DEBUG(D_verify) debug_printf_indent(" fork: %s\n", strerror(save_errno));
+ }
+else
+ {
+ uschar buf[128];
+ int n = read(pfd[pipe_read], buf, sizeof(buf));
+ int status;
- for (s = domain; *s != 0; s++)
+ waitpid(pid, &status, 0);
+ if (status == 0)
{
- if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_')
- {
- log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains "
- "strange characters - is this right?", domain);
- break;
- }
- }
+ uschar * s;
- /* Check the alternate domain if present */
-
- if (domain_txt != domain) for (s = domain_txt; *s != 0; s++)
- {
- if (!isalnum(*s) && *s != '-' && *s != '.' && *s != '_')
+ if (n > 0) yield = buf[0];
+ if (n > 4)
+ save_errno = (buf[1] << 24) | (buf[2] << 16) | (buf[3] << 8) | buf[4];
+ if ((recipient_verify_failure = n > 5
+ ? string_copyn_taint(buf+5, n-5, GET_UNTAINTED) : NULL))
{
- log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains "
- "strange characters - is this right?", domain_txt);
- break;
+ int m;
+ s = buf + 5 + Ustrlen(recipient_verify_failure) + 1;
+ m = n - (s - buf);
+ acl_verify_message = *msg =
+ m > 0 ? string_copyn_taint(s, m, GET_UNTAINTED) : NULL;
}
- }
- /* If there is no key string, construct the query by adding the domain name
- onto the inverted host address, and perform a single DNS lookup. */
+ DEBUG(D_verify) debug_printf_indent("verify call response:"
+ " len %d yield %s errno '%s' where '%s' msg '%s'\n",
+ n, rc_names[yield], strerror(save_errno), recipient_verify_failure, *msg);
- if (key == NULL)
- {
- if (sender_host_address == NULL) return FAIL; /* can never match */
- if (revadd[0] == 0) invert_address(revadd, sender_host_address);
- rc = one_check_dnsbl(domain, domain_txt, sender_host_address, revadd,
- iplist, bitmask, match_type, defer_return);
- if (rc == OK)
- {
- dnslist_domain = string_copy(domain_txt);
- dnslist_matched = string_copy(sender_host_address);
- HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
- sender_host_address, dnslist_domain);
- }
- if (rc != FAIL) return rc; /* OK or DEFER */
+ if ( yield == OK
+ || save_errno == 0 && Ustrcmp(recipient_verify_failure, "quota") == 0)
+ cache_quota_write(rcpt, yield, pos_cache, neg_cache);
+ else DEBUG(D_verify)
+ debug_printf_indent("result not cacheable\n");
}
-
- /* If there is a key string, it can be a list of domains or IP addresses to
- be concatenated with the main domain. */
-
else
{
- int keysep = 0;
- BOOL defer = FALSE;
- uschar *keydomain;
- uschar keybuffer[256];
- uschar keyrevadd[128];
-
- while ((keydomain = string_nextinlist(CUSS &key, &keysep, keybuffer,
- sizeof(keybuffer))) != NULL)
- {
- uschar *prepend = keydomain;
-
- if (string_is_ip_address(keydomain, NULL) != 0)
- {
- invert_address(keyrevadd, keydomain);
- prepend = keyrevadd;
- }
-
- rc = one_check_dnsbl(domain, domain_txt, keydomain, prepend, iplist,
- bitmask, match_type, defer_return);
-
- if (rc == OK)
- {
- dnslist_domain = string_copy(domain_txt);
- dnslist_matched = string_copy(keydomain);
- HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
- keydomain, dnslist_domain);
- return OK;
- }
-
- /* If the lookup deferred, remember this fact. We keep trying the rest
- of the list to see if we get a useful result, and if we don't, we return
- DEFER at the end. */
-
- if (rc == DEFER) defer = TRUE;
- } /* continue with next keystring domain/address */
-
- if (defer) return DEFER;
+ DEBUG(D_verify)
+ debug_printf_indent("verify call response: waitpid status 0x%04x\n", status);
}
- } /* continue with next dnsdb outer domain */
+ }
-return FAIL;
+close(pfd[pipe_read]);
+signal(SIGCHLD, oldsignal);
+errno = save_errno;
+return yield;
+
+fail:
+DEBUG(D_verify) debug_printf_indent("verify_quota_call fail in %s\n", where);
+return yield;
}
+
/* vi: aw ai sw=2
*/
/* End of verify.c */
git://git.exim.org / exim.git / blobdiff