X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/ea90b71819daaacf691fb3ec5526397d12790c62..4a5ee04fd186cb7d86a4f70821dacc55f8cce98d:/src/src/verify.c diff --git a/src/src/verify.c b/src/src/verify.c index 69ed33e23..9ff1807d4 100644 --- a/src/src/verify.c +++ b/src/src/verify.c @@ -2,7 +2,7 @@ * Exim - an Internet mail transport agent * *************************************************/ -/* Copyright (c) University of Cambridge 1995 - 2016 */ +/* Copyright (c) University of Cambridge 1995 - 2017 */ /* See the file NOTICE for conditions of use and distribution. */ /* Functions concerned with verifying things. The original code for callout @@ -39,7 +39,8 @@ static tree_node *dnsbl_cache = NULL; #define MT_NOT 1 #define MT_ALL 2 -static uschar cutthrough_response(char, uschar **); +static uschar cutthrough_response(char, uschar **, int); + /************************************************* @@ -118,129 +119,47 @@ 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; -uschar peer_offered = 0; - -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/", 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 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"); } -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))) { HDEBUG(D_verify) debug_printf("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 @@ -250,20 +169,21 @@ if (dbm_file != NULL) 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("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 @@ -273,26 +193,28 @@ if (dbm_file != NULL) 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("callout cache: domain accepts random addresses\n"); + 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("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("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, @@ -300,27 +222,29 @@ if (dbm_file != NULL) 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:\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("callout cache: domain does not accept " + "RCPT TO:\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: (not cached or cache expired)\n"); - goto END_CACHE; - } + { + HDEBUG(D_verify) + debug_printf("callout cache: need to check RCPT " + "TO: (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 @@ -328,10 +252,10 @@ if (dbm_file != NULL) */ HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT " - "TO:\n"); - pm_mailfrom = NULL; - new_domain_record.postmaster_result = ccache_accept; - new_domain_record.postmaster_stamp = cache_record->postmaster_stamp; + "TO:\n"); + *pm_ptr = NULL; + new_domain_record->postmaster_result = ccache_accept; + new_domain_record->postmaster_stamp = cache_record->postmaster_stamp; } } @@ -340,678 +264,481 @@ if (dbm_file != NULL) 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("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; } /* 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); - - /* 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(); +return FALSE; +} -/* 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. -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. +/* 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; - /* 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 (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, &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 = NULL; - - /* 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'; - - /* 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) - { - address_item * na = store_get(sizeof(address_item)); - *na = cutthrough.addr; - cutthrough.addr = *addr; - cutthrough.addr.host_used = &cutthrough.host; - cutthrough.addr.next = na; - - cutthrough.nrcpt++; - } - else - { - cancel_cutthrough_connection("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"); - - addr->message = - string_sprintf("response to \"%s\" from %s [%s] was: %s", - big_buffer, host->name, host->address, - string_printing(resp)); - - addr->user_message = - string_sprintf("Callout verification failed:\n%s", resp); +/* 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. - /* Hard rejection ends the process */ +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 (resp[0] == '5') /* Address rejected */ - { - yield = FAIL; - done = TRUE; - } - } - } - } - break; - } - if (!done) - cancel_cutthrough_connection("incompatible connection"); +if (dom_rec->result != ccache_unknown) + if (!(dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE))) + { + HDEBUG(D_verify) debug_printf("callout cache: not available\n"); } - - /* Now make connections to the hosts and do real callouts. The list of hosts - is passed in as an argument. */ - - for (host = host_list; host != NULL && !done; host = host->next) + else { - 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]; - uschar * size_str; - - clearflag(addr, af_verify_pmfail); /* postmaster callout flag */ - clearflag(addr, af_verify_nsfail); /* null sender callout flag */ - - /* Skip this host if we don't have an IP address for it. */ - - if (host->address == NULL) - { - DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n", - host->name); - continue; - } - - /* Check the overall callout timeout */ - - if (time(NULL) - callout_start_time >= callout_overall) - { - HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n"); - break; - } - - /* Set IPv4 or IPv6 */ - - host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6; - - /* 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. */ - - deliver_host = host->name; - deliver_host_address = host->address; - deliver_host_port = host->port; - deliver_domain = addr->domain; - transport_name = addr->transport->name; + (void)dbfn_write(dbm_file, domain, dom_rec, + (int)sizeof(dbdata_callout_cache)); + HDEBUG(D_verify) debug_printf("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); + } - 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 a definite result was obtained for the callout, cache it unless caching +is disabled. */ - /* Set HELO string according to the protocol */ - lmtp= Ustrcmp(tf->protocol, "lmtp") == 0; - smtps= Ustrcmp(tf->protocol, "smtps") == 0; +if (done && addr_rec->result != ccache_unknown) + { + if (!dbm_file) + dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE); + if (!dbm_file) + { + HDEBUG(D_verify) debug_printf("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("wrote %s callout cache address record for %s\n", + addr_rec->result == ccache_accept ? "positive" : "negative", + address_key); + } + } +if (dbm_file) dbfn_close(dbm_file); +} - HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port); - /* Set up the buffer for reading SMTP response packets. */ +/* 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. - inblock.buffer = inbuffer; - inblock.buffersize = sizeof(inbuffer); - inblock.ptr = inbuffer; - inblock.ptrend = inbuffer; +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. - /* Set up the buffer for holding SMTP commands while pipelining */ +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; +host_item * host; - outblock.buffer = outbuffer; - outblock.buffersize = sizeof(outbuffer); - outblock.ptr = outbuffer; - outblock.cmd_count = 0; - outblock.authenticating = FALSE; +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, &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 = NULL; - /* 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. */ + /* Match! Send the RCPT TO, set done from the response */ + done = + smtp_write_command(&ctblock, FALSE, "RCPT TO:<%.1000s>\r\n", + transport_rcpt_address(addr, + addr->transport->rcpt_include_affixes)) >= 0 && + cutthrough_response('2', &resp, CUTTHROUGH_DATA_TIMEOUT) == '2'; - tls_retry_connection: + /* 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. */ - /* Reset the parameters of a TLS session */ - tls_out.cipher = tls_out.peerdn = tls_out.peercert = NULL; + 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; - 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; - } + cutthrough.nrcpt++; + } + else + { + cancel_cutthrough_connection("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"); -#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) - { - int rc; + addr->message = + string_sprintf("response to \"%s\" was: %s", + big_buffer, string_printing(resp)); - tls_out.dane_verified = FALSE; - tls_out.tlsa_usage = 0; + addr->user_message = + string_sprintf("Callout verification failed:\n%s", resp); - dane_required = - verify_check_given_host(&ob->hosts_require_dane, host) == OK; + /* Hard rejection ends the process */ - if (host->dnssec == DS_YES) - { - if( dane_required - || verify_check_given_host(&ob->hosts_try_dane, host) == OK - ) - { - if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required)) != OK) - return rc; - dane = TRUE; + if (resp[0] == '5') /* Address rejected */ + { + *yield = FAIL; + done = TRUE; + } + } } } - else if (dane_required) - { - log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name); - return FAIL; - } - - if (dane) - ob->tls_tempfail_tryclear = FALSE; + break; /* host_list */ } -#endif /*DANE*/ +if (!done) + cancel_cutthrough_connection("incompatible connection"); +return done; +} - /* Expand the helo_data string to find the host name to use. */ - 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; - } +/************************************************* +* Do callout verification for an 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. */ +/* 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. - Ustrcpy(big_buffer, "initial connection"); +Arguments: + addr the address that's been routed + host_list the list of hosts to try + tf the transport feedback block - /* Unless ssl-on-connect, wait for the initial greeting */ - smtps_redo_greeting: + 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 -#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; +Returns: OK/FAIL/DEFER +*/ -#ifndef DISABLE_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 - } +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; - /* 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"); +new_domain_record.result = ccache_unknown; +new_domain_record.postmaster_result = ccache_unknown; +new_domain_record.random_result = ccache_unknown; - tls_redo_helo: +memset(&new_address_record, 0, sizeof(new_address_record)); -#ifdef SUPPORT_TLS - if (smtps && tls_out.active < 0) /* ssl-on-connect, first pass */ - { - peer_offered &= ~PEER_OFFERED_TLS; - ob->tls_tempfail_tryclear = FALSE; - } - else /* all other cases */ -#endif +/* 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. */ - { esmtp_retry: +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/", addr->address, + qualify_domain_sender); + } + else + { + from_address = US""; + address_key = addr->address; + } - 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 - peer_offered &= ~PEER_OFFERED_TLS; -#endif - esmtp = FALSE; - goto esmtp_retry; /* fallback to HELO */ - } +/* For a sender callout, we must adjust the key if the mailfrom address is not +empty. */ - /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ +else + { + from_address = se_mailfrom ? se_mailfrom : US""; + address_key = *from_address + ? string_sprintf("%s/<%s>", addr->address, from_address) : addr->address; + } + +if (cached_callout_lookup(addr, address_key, from_address, + &options, &pm_mailfrom, &yield, failure_ptr, + &new_domain_record, &old_domain_cache_result)) + goto END_CALLOUT; + +if (!addr->transport) + { + HDEBUG(D_verify) debug_printf("cannot callout via null transport\n"); + } +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; + host_item * host; - peer_offered = esmtp - ? ehlo_response(responsebuffer, sizeof(responsebuffer), - (!suppress_tls && tls_out.active < 0 ? PEER_OFFERED_TLS : 0) - | 0 /* no IGNQ */ - | 0 /* no PRDR */ -#ifdef SUPPORT_I18N - | (addr->prop.utf8_msg && !addr->prop.utf8_downcvt - ? PEER_OFFERED_UTF8 : 0) -#endif - | 0 /* no DSN */ - | 0 /* no PIPE */ - - /* only care about SIZE if we have size from inbound */ - | (message_size > 0 && ob->size_addition >= 0 - ? PEER_OFFERED_SIZE : 0) - ) - : 0; - } + /* 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. */ - size_str = peer_offered & PEER_OFFERED_SIZE - ? string_sprintf(" SIZE=%d", message_size + ob->size_addition) : US""; + 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); -#ifdef SUPPORT_TLS - tls_offered = !!(peer_offered & PEER_OFFERED_TLS); -#endif + /* Default the connect and overall callout timeouts if not set, and record the + time we are starting so that we can enforce it. */ - /* 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. */ + if (callout_overall < 0) callout_overall = 4 * callout; + if (callout_connect < 0) callout_connect = callout; + callout_start_time = time(NULL); -#ifdef SUPPORT_TLS - if ( peer_offered & PEER_OFFERED_TLS - && 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; - } - } + /* 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. */ - /* 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); -# ifndef DISABLE_EVENT - (void) event_raise(addr->transport->event_action, - US"tcp:close", NULL); -# 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; - } - } + if (smtp_out && !disable_callout_flush) mac_smtp_fflush(); - /*save_errno = ERRNO_TLSFAILURE;*/ - /*message = US"failure while setting up TLS session";*/ - send_quit = FALSE; - done= FALSE; - goto TLS_FAILED; - } + clearflag(addr, af_verify_pmfail); /* postmaster callout flag */ + clearflag(addr, af_verify_nsfail); /* null sender callout flag */ - /* TLS session is set up. Copy info for logging. */ - addr->cipher = tls_out.cipher; - addr->peerdn = tls_out.peerdn; +/* 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. */ - /* For SMTPS we need to wait for the initial OK response, then do HELO. */ - if (smtps) - goto smtps_redo_greeting; + /* 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 + ) + done = cutthrough_multi(addr, host_list, tf, &yield); - /* For STARTTLS we need to redo EHLO */ - goto tls_redo_helo; - } - } + /* 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. */ - /* 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, - peer_offered & PEER_OFFERED_TLS - ? "an attempt to start TLS failed" - : "the server did not offer TLS support"); - done= FALSE; - goto TLS_FAILED; - } + for (host = host_list; host && !done; host = host->next) + { + int host_af; + int port = 25; + uschar *interface = NULL; /* Outgoing interface to use; NULL => any */ + smtp_context sx; -#endif /*SUPPORT_TLS*/ + if (!host->address) + { + DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n", + host->name); + continue; + } - done = TRUE; /* so far so good; have response to HELO */ + /* Check the overall callout timeout */ - /* For now, transport_filter by cutthrough-delivery is not supported */ - /* Need proper integration with the proper transport mechanism. */ - if (cutthrough.delivery) + if (time(NULL) - callout_start_time >= callout_overall) { - 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 + HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n"); + break; } - SEND_FAILED: - RESPONSE_FAILED: - TLS_FAILED: - ; - /* Clear down of the TLS, SMTP and TCP layers on error is handled below. */ + /* Set IPv4 or IPv6 */ - /* Failure to accept HELO is cached; this blocks the whole domain for all - senders. I/O errors and defer responses are not cached. */ + host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET; - if (!done) - { - *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; - } - } + /* 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. */ -#ifdef SUPPORT_I18N - else if ( addr->prop.utf8_msg - && !addr->prop.utf8_downcvt - && !(peer_offered & PEER_OFFERED_UTF8) - ) - { - HDEBUG(D_acl|D_v) debug_printf("utf8 required but not offered\n"); - errno = ERRNO_UTF8_FWD; - setflag(addr, af_verify_nsfail); - done = FALSE; - } - else if ( addr->prop.utf8_msg - && (addr->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8)) - && (setflag(addr, af_utf8_downcvt), - from_address = string_address_utf8_to_alabel(from_address, - &addr->message), - addr->message - ) ) - { - errno = ERRNO_EXPANDFAIL; - setflag(addr, af_verify_nsfail); - done = FALSE; - } -#endif + deliver_host = host->name; + deliver_host_address = host->address; + deliver_host_port = host->port; + deliver_domain = addr->domain; + transport_name = addr->transport->name; - /* If we haven't authenticated, but are required to, give up. */ - /* Try to AUTH */ + 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); - else done = smtp_auth(responsebuffer, sizeof(responsebuffer), - addr, host, ob, esmtp, &inblock, &outblock) == OK && + sx.addrlist = addr; + sx.host = host; + sx.host_af = host_af, + sx.port = port; + sx.interface = interface; + sx.helo_data = tf->helo_data; + sx.tblock = addr->transport; + sx.verify = TRUE; - /* Copy AUTH info for logging */ - ( (addr->authenticator = client_authenticator), - (addr->auth_id = client_authenticated_id), +tls_retry_connection: + /* Set the address state so that errors are recorded in it */ - /* Build a mail-AUTH string (re-using responsebuffer for convenience */ - !smtp_mail_auth_str(responsebuffer, sizeof(responsebuffer), addr, ob) - ) && + addr->transport_return = PENDING_DEFER; + ob->connect_timeout = callout_connect; + ob->command_timeout = callout; - ( (addr->auth_sndr = client_authenticated_sender), + /* 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 */ - /* Send the MAIL command */ - (smtp_write_command(&outblock, FALSE, -#ifdef SUPPORT_I18N - addr->prop.utf8_msg && !addr->prop.utf8_downcvt - ? "MAIL FROM:<%s>%s%s SMTPUTF8\r\n" - : + yield = smtp_setup_conn(&sx, FALSE); +#ifdef SUPPORT_TLS + if ( yield == DEFER + && addr->basic_errno == ERRNO_TLSFAILURE + && ob->tls_tempfail_tryclear + && verify_check_given_host(&ob->hosts_require_tls, host) != OK + ) + { + 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 - "MAIL FROM:<%s>%s%s\r\n", - from_address, responsebuffer, size_str) >= 0) - ) && + if (yield != OK) + { + errno = addr->basic_errno; + transport_name = NULL; + deliver_host = deliver_host_address = NULL; + deliver_domain = save_deliver_domain; - smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), - '2', callout); + /* Failure to accept HELO is cached; this blocks the whole domain for all + senders. I/O errors and defer responses are not cached. */ - deliver_host = deliver_host_address = NULL; - deliver_domain = save_deliver_domain; + 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; + } - /* 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. */ + /* If we needed to authenticate, smtp_setup_conn() did that. Copy + the AUTH info for logging */ - 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; - } - } + addr->authenticator = client_authenticator; + addr->auth_id = client_authenticated_id; - /* 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:<>. + 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; - 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. */ + new_domain_record.result = old_domain_cache_result == ccache_reject_mfnull + ? ccache_reject_mfnull : ccache_accept; - else + /* Do the random local part check first. Temporarily replace the recipient + with the "random" value */ + + if (random_local_part) { + uschar * main_address = addr->address; const uschar * rcpt_domain = addr->domain; #ifdef SUPPORT_I18N @@ -1029,181 +756,185 @@ can do it there for the non-rcpt-verify case. For this we keep an addresscount. } #endif - new_domain_record.result = - (old_domain_cache_result == ccache_reject_mfnull)? - ccache_reject_mfnull: ccache_accept; - - /* Do the random local part check first */ - - 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, - rcpt_domain) >= 0 && - smtp_read_response(&inblock, randombuffer, - sizeof(randombuffer), '2', callout); - - /* Remember when we last did a random test */ - - new_domain_record.random_stamp = time(NULL); - - /* If accepted, we aren't going to do any further tests below. */ - - if (random_ok) - new_domain_record.random_result = ccache_accept; + /* This would be ok for 1st rcpt of a cutthrough (XXX do we have a count?) , but no way to + handle a subsequent because of the RSET. So refuse to support any. */ + cancel_cutthrough_connection("random-recipient"); - /* 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. - */ - - 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"); + addr->address = string_sprintf("%s@%.1000s", + random_local_part, rcpt_domain); + done = FALSE; - if (randombuffer[0] == '5') - new_domain_record.random_result = ccache_reject; + /* 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. + */ - done = - smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 && - smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), - '2', callout) && + /* Remember when we last did a random test */ + new_domain_record.random_stamp = time(NULL); - smtp_write_command(&outblock, FALSE, -#ifdef SUPPORT_I18N - addr->prop.utf8_msg && !addr->prop.utf8_downcvt - ? "MAIL FROM:<%s> SMTPUTF8\r\n" - : -#endif - "MAIL FROM:<%s>\r\n", - from_address) >= 0 && - smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), - '2', callout); + if (smtp_write_mail_and_rcpt_cmds(&sx, &yield) == 0) + switch(addr->transport_return) + { + case PENDING_OK: + new_domain_record.random_result = ccache_accept; + break; + case FAIL: + new_domain_record.random_result = ccache_reject; + + /* 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.outblock, FALSE, "RSET\r\n") >= 0 && + smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), + '2', callout))) + break; - if (!done) - { HDEBUG(D_acl|D_v) - debug_printf("problem after random/rset/mfrom; reopen conn\n"); + debug_printf_indent("problem after random/rset/mfrom; reopen conn\n"); random_local_part = NULL; #ifdef SUPPORT_TLS tls_close(FALSE, TRUE); #endif - (void)close(inblock.sock); + HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); + (void)close(sx.inblock.sock); + sx.inblock.sock = sx.outblock.sock = -1; #ifndef DISABLE_EVENT (void) event_raise(addr->transport->event_action, US"tcp:close", 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; - } - } - else done = FALSE; /* Some timeout/connection problem */ - } /* Random check */ - - /* 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 (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. */ + /* 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; - uschar * rcpt = transport_rcpt_address(addr, - addr->transport ? addr->transport->rcpt_include_affixes : FALSE); + /* Main verify. 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. */ -#ifdef SUPPORT_I18N - /*XXX should the conversion be moved into transport_rcpt_address() ? */ - uschar * dummy_errstr = NULL; - if ( testflag(addr, af_utf8_downcvt) - && (rcpt = string_address_utf8_to_alabel(rcpt, &dummy_errstr), - dummy_errstr - ) ) + if (done) + { + done = FALSE; + switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield)) { - errno = ERRNO_EXPANDFAIL; - *failure_ptr = US"recipient"; - done = FALSE; + 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 */ } - else -#endif + } - done = - smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n", - rcpt) >= 0 && - smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), - '2', callout); + addr->auth_sndr = client_authenticated_sender; - 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; - } + deliver_host = deliver_host_address = NULL; + deliver_domain = save_deliver_domain; - /* Do postmaster check if requested; if a full check is required, we - check for RCPT TO: (no domain) in accordance with RFC 821. */ + /* Do postmaster check if requested; if a full check is required, we + check for RCPT TO: (no domain) in accordance with RFC 821. */ - 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:\r\n", rcpt_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:\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 && 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("postmaster verify"); + HDEBUG(D_acl|D_v) debug_printf_indent("Cutthrough cancelled by presence of postmaster verify\n"); + + done = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0 + && smtp_read_response(&sx.inblock, sx.buffer, + sizeof(sx.buffer), '2', callout); + + if (done) + { + uschar * main_address = addr->address; + + /*XXX oops, affixes */ + addr->address = string_sprintf("postmaster@%.1000s", addr->domain); + addr->transport_return = PENDING_DEFER; + + sx.from_addr = pm_mailfrom; + sx.first_addr = sx.sync_addr = addr; + sx.ok = FALSE; + sx.send_rset = TRUE; + sx.completed_addr = FALSE; + + 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.outblock, FALSE, + "RCPT TO:\r\n") >= 0 + && smtp_read_response(&sx.inblock, sx.buffer, + sizeof(sx.buffer), '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 && 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 @@ -1214,70 +945,80 @@ can do it there for the non-rcpt-verify case. For this we keep an addresscount. 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; - } + case ETIMEDOUT: + HDEBUG(D_verify) debug_printf("SMTP timeout\n"); + sx.send_quit = FALSE; + break; + #ifdef SUPPORT_I18N - else if (errno == ERRNO_UTF8_FWD) + case ERRNO_UTF8_FWD: { extern int acl_where; /* src/acl.c */ errno = 0; addr->message = string_sprintf( - "response to \"%s\" from %s [%s] did not include SMTPUTF8", - big_buffer, host->name, host->address); - addr->user_message = acl_where == ACL_WHERE_RCPT - ? US"533 mailbox name not allowed" + "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 - else if (errno == 0) - { - if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped"); + case ECONNREFUSED: + 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)); + 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 reationalise. 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)); - /* Hard rejection ends the process */ + 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); - if (responsebuffer[0] == '5') /* Address rejected */ - { - yield = FAIL; - done = TRUE; - } - } + /* Hard rejection ends the process */ + + 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 && 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 + && !sx.lmtp ) { - cutthrough.fd = outblock.sock; /* We assume no buffer in use in the outblock */ + HDEBUG(D_acl|D_v) debug_printf_indent("holding verify callout open for cutthrough delivery\n"); + + cutthrough.fd = sx.outblock.sock; /* We assume no buffer in use in the outblock */ cutthrough.nrcpt = 1; cutthrough.interface = interface; cutthrough.host = *host; @@ -1297,96 +1038,69 @@ can do it there for the non-rcpt-verify case. For this we keep an addresscount. { /* Ensure no cutthrough on multiple address verifies */ 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("not usable for cutthrough"); + if (sx.send_quit) + { + (void) smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n"); + + /* Wait a short time for response, and discard it */ + smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), + '2', 1); + } + if (sx.inblock.sock >= 0) + { #ifdef SUPPORT_TLS - tls_close(FALSE, TRUE); + tls_close(FALSE, TRUE); #endif - (void)close(inblock.sock); + HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); + (void)close(sx.inblock.sock); + sx.inblock.sock = sx.outblock.sock = -1; #ifndef DISABLE_EVENT - (void) event_raise(addr->transport->event_action, US"tcp:close", NULL); + (void) event_raise(addr->transport->event_action, US"tcp:close", 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); - } - } +However, there may be domain-specific information to cache in both cases. */ -/* If a definite result was obtained for the callout, cache it unless caching -is disabled. */ - -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 */ @@ -1396,7 +1110,7 @@ else /* !done */ /* 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 yield; } @@ -1416,13 +1130,15 @@ int rc; 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"); -rc= 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"); +addr->message = addr2.message; +addr->user_message = addr2.user_message; +HDEBUG(D_acl) debug_printf_indent("----------- end cutthrough setup ------------\n"); return rc; } @@ -1447,7 +1163,7 @@ if( 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; } @@ -1509,7 +1225,7 @@ return cutthrough_puts(US"\r\n", 2); /* Get and check response from cutthrough target */ static uschar -cutthrough_response(char expect, uschar ** copy) +cutthrough_response(char expect, uschar ** copy, int timeout) { smtp_inblock inblock; uschar inbuffer[4096]; @@ -1521,7 +1237,7 @@ 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)) +if(!smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer), expect, timeout)) cancel_cutthrough_connection("target timeout on read"); if(copy != NULL) @@ -1545,18 +1261,18 @@ cutthrough_predata(void) if(cutthrough.fd < 0) return FALSE; -HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> DATA\n"); +HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> DATA\n"); 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('3', NULL, CUTTHROUGH_DATA_TIMEOUT) == '3'; } -/* fd and use_crlf args only to match write_chunk() */ +/* fd and tctx args only to match write_chunk() */ static BOOL -cutthrough_write_chunk(int fd, uschar * s, int len, BOOL use_crlf) +cutthrough_write_chunk(int fd, transport_ctx * tctx, uschar * s, int len) { uschar * s2; while(s && (s2 = Ustrchr(s, '\n'))) @@ -1575,23 +1291,26 @@ return TRUE; BOOL cutthrough_headers_send(void) { +transport_ctx tctx; + if(cutthrough.fd < 0) 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.tblock = cutthrough.addr.transport; +tctx.addr = &cutthrough.addr; +tctx.check_string = US"."; +tctx.escape_string = US".."; +tctx.options = topt_use_crlf; + +if (!transport_headers_send(cutthrough.fd, &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; } @@ -1606,17 +1325,20 @@ if(cutthrough.fd >= 0) conn before the final dot. */ ctblock.ptr = ctbuffer; - HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> QUIT\n"); + HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n"); _cutthrough_puts(US"QUIT\r\n", 6); /* avoid recursion */ _cutthrough_flush_send(); - /* No wait for response */ + + /* Wait a short time for response, and discard it */ + cutthrough_response('2', NULL, 1); #ifdef SUPPORT_TLS tls_close(FALSE, TRUE); #endif + HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); (void)close(cutthrough.fd); cutthrough.fd = -1; - HDEBUG(D_acl) debug_printf("----------- cutthrough shutdown (%s) ------------\n", why); + HDEBUG(D_acl) debug_printf_indent("----------- cutthrough shutdown (%s) ------------\n", why); } ctblock.ptr = ctbuffer; } @@ -1641,7 +1363,7 @@ 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) @@ -1650,7 +1372,7 @@ if( !cutthrough_puts(US".", 1) ) return cutthrough.addr.message; -res = cutthrough_response('2', &cutthrough.addr.message); +res = cutthrough_response('2', &cutthrough.addr.message, CUTTHROUGH_DATA_TIMEOUT); for (addr = &cutthrough.addr; addr; addr = addr->next) { addr->message = cutthrough.addr.message; @@ -1808,21 +1530,20 @@ verify_address(address_item *vaddr, FILE *f, int options, int callout, { BOOL allok = TRUE; BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0); -BOOL is_recipient = (options & vopt_is_recipient) != 0; 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; + 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; @@ -1855,7 +1576,7 @@ if (parse_find_at(address) == NULL) *failure_ptr = US"qualify"; return FAIL; } - address = rewrite_address_qualify(address, is_recipient); + address = rewrite_address_qualify(address, options & vopt_is_recipient); } DEBUG(D_verify) @@ -1870,7 +1591,7 @@ may have been set by domains and local part tests during an ACL. */ if (global_rewrite_rules != NULL) { uschar *old = address; - address = rewrite_address(address, is_recipient, FALSE, + address = rewrite_address(address, options & vopt_is_recipient, FALSE, global_rewrite_rules, rewrite_existflags); if (address != old) { @@ -1905,7 +1626,7 @@ save_sender = sender_address; /* Observability variable for router/transport use */ -verify_mode = is_recipient ? US"R" : US"S"; +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. */ @@ -1971,18 +1692,18 @@ while (addr_new) /* Just in case some router parameter refers to it. */ - return_path = (addr->prop.errors_address != NULL)? - addr->prop.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 */ @@ -1996,11 +1717,11 @@ while (addr_new) if (rc == OK) { - if (routed != NULL) *routed = TRUE; + 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. */ @@ -2030,7 +1751,7 @@ while (addr_new) 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)) + if (tf.hosts && (!host_list || tf.hosts_override)) { uschar *s; const uschar *save_deliver_domain = deliver_domain; @@ -2044,7 +1765,7 @@ while (addr_new) deliver_domain = save_deliver_domain; deliver_localpart = save_deliver_localpart; - if (s == NULL) + if (!s) { log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts " "\"%s\" in %s transport for callout: %s", tf.hosts, @@ -2066,7 +1787,7 @@ while (addr_new) 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) + for (host = host_list; host; host = nexthost) { nexthost = host->next; if (tf.gethostbyname || @@ -2082,7 +1803,7 @@ while (addr_new) dnssec_domains = &ob->dnssec; } - (void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL, + (void) host_find_bydns(host, NULL, flags, NULL, NULL, NULL, dnssec_domains, NULL, NULL); } } @@ -2093,7 +1814,7 @@ while (addr_new) /* 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) @@ -2134,24 +1855,24 @@ while (addr_new) if (rc == FAIL) { allok = FALSE; - if (f != NULL) + if (f) { 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"); + full_info ? addr->address : address, + address_test_mode ? "is undeliverable" : "failed to verify"); if (!expn && admin_user) { if (addr->basic_errno > 0) respond_printf(f, ": %s", strerror(addr->basic_errno)); - if (addr->message != NULL) + if (addr->message) respond_printf(f, ": %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); p = p->parent; @@ -2161,11 +1882,11 @@ while (addr_new) cancel_cutthrough_connection("routing hard fail"); if (!full_info) - { + { yield = copy_error(vaddr, addr, FAIL); goto out; - } - else yield = FAIL; + } + yield = FAIL; } /* Soft failure */ @@ -2173,7 +1894,7 @@ while (addr_new) else if (rc == DEFER) { allok = FALSE; - if (f != NULL) + if (f) { address_item *p = addr->parent; respond_printf(f, "%s%s cannot be resolved at this time", ko_prefix, @@ -2182,7 +1903,7 @@ while (addr_new) { if (addr->basic_errno > 0) respond_printf(f, ": %s", strerror(addr->basic_errno)); - if (addr->message != NULL) + if (addr->message) respond_printf(f, ": %s", addr->message); else if (addr->basic_errno <= 0) respond_printf(f, ": unknown error"); @@ -2190,7 +1911,7 @@ while (addr_new) /* 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); p = p->parent; @@ -2204,7 +1925,7 @@ while (addr_new) 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 @@ -2213,20 +1934,20 @@ while (addr_new) else if (expn) { uschar *ok_prefix = US"250-"; - if (addr_new == NULL) - { - if (addr_local == NULL && addr_remote == NULL) + + if (!addr_new) + if (!addr_local && !addr_remote) respond_printf(f, "250 mail to <%s> is discarded\r\n", address); else respond_printf(f, "250 <%s>\r\n", address); - } - else while (addr_new != NULL) + + else do { address_item *addr2 = addr_new; addr_new = addr2->next; - if (addr_new == NULL) ok_prefix = US"250 "; + if (!addr_new) ok_prefix = US"250 "; respond_printf(f, "%s<%s>\r\n", ok_prefix, addr2->address); - } + } while (addr_new); yield = OK; goto out; } @@ -2248,21 +1969,30 @@ while (addr_new) 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 (f) fprintf(f, "%s %s\n", + address, 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->prop.address_data = addr->prop.address_data; + + /* If stopped because more than one new address, cannot cutthrough */ + + if (addr_new && addr_new->next) + cancel_cutthrough_connection("multiple addresses from routing"); + yield = OK; goto out; } @@ -2278,7 +2008,7 @@ If there are no local and no remote addresses, and there were no pipes, files, 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); goto out; @@ -2495,7 +2225,7 @@ 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: @@ -2882,9 +2612,8 @@ DEBUG(D_ident) debug_printf("doing ident callback\n"); 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 ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return; if (ip_bind(sock, host_af, interface_address, 0) < 0) { @@ -2893,19 +2622,15 @@ if (ip_bind(sock, host_af, interface_address, 0) < 0) goto END_OFF; } -if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout) - < 0) +if (ip_connect(sock, host_af, sender_host_address, port, + rfc1413_query_timeout, TRUE) < 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; } @@ -3081,7 +2806,7 @@ if (*ss == '@') } /* 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); @@ -3596,7 +3321,7 @@ else (void)tree_insertnode(&dnsbl_cache, t); } - /* Do the DNS loopup . */ + /* Do the DNS lookup . */ HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query); cb->rc = dns_basic_lookup(&dnsa, query, T_A);