{ "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
# endif
{ "data_timeout", opt_time, LOFF(data_timeout) },
- { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
+ { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
#ifndef DISABLE_DKIM
{ "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
{ "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
/* Default private options block for the smtp transport. */
smtp_transport_options_block smtp_transport_option_defaults = {
- .hosts = NULL,
- .fallback_hosts = NULL,
- .hostlist = NULL,
- .fallback_hostlist = NULL,
+ /* All non-mentioned elements 0/NULL/FALSE */
.helo_data = US"$primary_hostname",
- .interface = NULL,
- .port = NULL,
.protocol = US"smtp",
- .dscp = NULL,
- .serialize_hosts = NULL,
- .hosts_try_auth = NULL,
- .hosts_require_auth = NULL,
.hosts_try_chunking = US"*",
#ifdef SUPPORT_DANE
.hosts_try_dane = US"*",
- .hosts_require_dane = NULL,
- .dane_require_tls_ciphers = NULL,
#endif
.hosts_try_fastopen = US"*",
#ifndef DISABLE_PRDR
#endif
#ifndef DISABLE_OCSP
.hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
- .hosts_require_ocsp = NULL,
-#endif
- .hosts_require_tls = NULL,
- .hosts_avoid_tls = NULL,
- .hosts_verify_avoid_tls = NULL,
- .hosts_avoid_pipelining = NULL,
-#ifndef DISABLE_PIPE_CONNECT
- .hosts_pipe_connect = NULL,
-#endif
- .hosts_avoid_esmtp = NULL,
-#ifndef DISABLE_TLS
- .hosts_nopass_tls = NULL,
- .hosts_noproxy_tls = NULL,
#endif
.command_timeout = 5*60,
.connect_timeout = 5*60,
.hosts_max_try_hardlimit = 50,
.message_linelength_limit = 998,
.address_retry_include_sender = TRUE,
- .allow_localhost = FALSE,
- .authenticated_sender_force = FALSE,
- .gethostbyname = FALSE,
.dns_qualify_single = TRUE,
- .dns_search_parents = FALSE,
.dnssec = { .request= US"*", .require=NULL },
.delay_after_cutoff = TRUE,
- .hosts_override = FALSE,
- .hosts_randomize = FALSE,
.keepalive = TRUE,
- .lmtp_ignore_quota = FALSE,
- .expand_retry_include_ip_address = NULL,
.retry_include_ip_address = TRUE,
-#ifdef SUPPORT_SOCKS
- .socks_proxy = NULL,
-#endif
#ifndef DISABLE_TLS
- .tls_certificate = NULL,
- .tls_crl = NULL,
- .tls_privatekey = NULL,
- .tls_require_ciphers = NULL,
- .tls_sni = NULL,
+# if defined(SUPPORT_SYSDEFAULT_CABUNDLE) || !defined(USE_GNUTLS)
.tls_verify_certificates = US"system",
+# endif
.tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
.tls_tempfail_tryclear = TRUE,
-# ifndef DISABLE_TLS_RESUME
- .tls_resumption_hosts = NULL,
-# endif
- .tls_verify_hosts = NULL,
.tls_try_verify_hosts = US"*",
.tls_verify_cert_hostnames = US"*",
#endif
#endif
#ifndef DISABLE_DKIM
.dkim =
- {.dkim_domain = NULL,
- .dkim_identity = NULL,
- .dkim_private_key = NULL,
- .dkim_selector = NULL,
- .dkim_canon = NULL,
- .dkim_sign_headers = NULL,
- .dkim_strict = NULL,
- .dkim_hash = US"sha256",
- .dkim_timestamps = NULL,
- .dot_stuffed = FALSE,
- .force_bodyhash = FALSE,
-# ifdef EXPERIMENTAL_ARC
- .arc_signspec = NULL,
-# endif
- },
-# ifdef EXPERIMENTAL_ARC
- .arc_sign = NULL,
-# endif
+ { .dkim_hash = US"sha256", },
#endif
};
if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
#endif
+
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+if (!regex_LIMITS) regex_LIMITS =
+ regex_must_compile(US"\\n250[\\s\\-]LIMITS\\s", FALSE, TRUE);
+#endif
}
/* If hosts_override is set and there are local hosts, set the global
flag that stops verify from showing router hosts. */
-if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
+if (ob->hosts_override && ob->hosts) tblock->overrides_hosts = TRUE;
/* If there are any fallback hosts listed, build a chain of host items
for them, but do not do any lookups at this time. */
static BOOL
smtp_reap_banner(smtp_context * sx)
{
-BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
+BOOL good_response;
+#if defined(__linux__) && defined(TCP_QUICKACK)
+ { /* Hack to get QUICKACK disabled; has to be right after 3whs, and has to on->off */
+ int sock = sx->cctx.sock;
+ struct pollfd p = {.fd = sock, .events = POLLOUT};
+ int rc = poll(&p, 1, 1000);
+ (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &on, sizeof(on));
+ (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
+ }
+#endif
+good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
'2', (SOB sx->conn_args.ob)->command_timeout);
#ifdef EXPERIMENTAL_DSN_INFO
sx->smtp_greeting = string_copy(sx->buffer);
}
+/******************************************************************************/
+
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+/* If TLS, or TLS not offered, called with the EHLO response in the buffer.
+Check it for a LIMITS keyword and parse values into the smtp context structure.
+
+We don't bother with peers that we won't talk TLS to, even though they can,
+just ignore their LIMITS advice (if any) and treat them as if they do not.
+This saves us dealing with a duplicate set of values. */
+
+static void
+ehlo_response_limits_read(smtp_context * sx)
+{
+int ovec[3]; /* results vector for a main-match only */
+
+/* matches up to just after the first space after the keyword */
+
+if (pcre_exec(regex_LIMITS, NULL, CS sx->buffer, Ustrlen(sx->buffer),
+ 0, PCRE_EOPT, ovec, nelem(ovec)) >= 0)
+ for (const uschar * s = sx->buffer + ovec[1]; *s; )
+ {
+ while (isspace(*s)) s++;
+ if (*s == '\n') break;
+
+ if (strncmpic(s, US"MAILMAX=", 8) == 0)
+ {
+ sx->peer_limit_mail = atoi(CS (s += 8));
+ while (isdigit(*s)) s++;
+ }
+ else if (strncmpic(s, US"RCPTMAX=", 8) == 0)
+ {
+ sx->peer_limit_rcpt = atoi(CS (s += 8));
+ while (isdigit(*s)) s++;
+ }
+ else if (strncmpic(s, US"RCPTDOMAINMAX=", 14) == 0)
+ {
+ sx->peer_limit_rcptdom = atoi(CS (s += 14));
+ while (isdigit(*s)) s++;
+ }
+ else
+ while (*s && !isspace(*s)) s++;
+ }
+}
+
+/* Apply given values to the current connection */
+static void
+ehlo_limits_apply(smtp_context * sx,
+ unsigned limit_mail, unsigned limit_rcpt, unsigned limit_rcptdom)
+{
+if (limit_mail && limit_mail < sx->max_mail) sx->max_mail = limit_mail;
+if (limit_rcpt && limit_rcpt < sx->max_rcpt) sx->max_rcpt = limit_rcpt;
+if (limit_rcptdom)
+ {
+ DEBUG(D_transport) debug_printf("will treat as !multi_domain\n");
+ sx->single_rcpt_domain = TRUE;
+ }
+}
+
+/* Apply values from EHLO-resp to the current connection */
+static void
+ehlo_response_limits_apply(smtp_context * sx)
+{
+ehlo_limits_apply(sx, sx->peer_limit_mail, sx->peer_limit_rcpt,
+ sx->peer_limit_rcptdom);
+}
+
+/* Apply values read from cache to the current connection */
+static void
+ehlo_cache_limits_apply(smtp_context * sx)
+{
+ehlo_limits_apply(sx, sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
+ sx->ehlo_resp.limit_rcptdom);
+}
+#endif
+
+/******************************************************************************/
#ifndef DISABLE_PIPE_CONNECT
static uschar *
host->port == PORT_NONE ? sx->port : host->port);
}
+/* Cache EHLO-response info for use by early-pipe.
+Called
+- During a normal flow on EHLO response (either cleartext or under TLS),
+ when we are willing to do PIPE_CONNECT and it is offered
+- During an early-pipe flow on receiving the actual EHLO response and noting
+ disparity versus the cached info used, when PIPE_CONNECT is still being offered
+
+We assume that suitable values have been set in the sx.ehlo_resp structure for
+features and auths; we handle the copy of limits. */
+
static void
-write_ehlo_cache_entry(const smtp_context * sx)
+write_ehlo_cache_entry(smtp_context * sx)
{
open_db dbblock, * dbm_file;
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+sx->ehlo_resp.limit_mail = sx->peer_limit_mail;
+sx->ehlo_resp.limit_rcpt = sx->peer_limit_rcpt;
+sx->ehlo_resp.limit_rcptdom = sx->peer_limit_rcptdom;
+#endif
+
if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
{
uschar * ehlo_resp_key = ehlo_cache_key(sx);
dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
- HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
- sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
- sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
+ HDEBUG(D_transport)
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ if (sx->ehlo_resp.limit_mail || sx->ehlo_resp.limit_rcpt || sx->ehlo_resp.limit_rcptdom)
+ debug_printf("writing clr %04x/%04x cry %04x/%04x lim %05d/%05d/%05d\n",
+ sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
+ sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths,
+ sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
+ sx->ehlo_resp.limit_rcptdom);
+ else
+#endif
+ debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
+ sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
+ sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
dbfn_close(dbm_file);
uschar * ehlo_resp_key = ehlo_cache_key(sx);
dbdata_ehlo_resp * er;
- if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
+ if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
{ DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
else if (time(NULL) - er->time_stamp > retry_data_expire)
{
}
else
{
+ DEBUG(D_transport)
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ if (er->data.limit_mail || er->data.limit_rcpt || er->data.limit_rcptdom)
+ debug_printf("EHLO response bits from cache:"
+ " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x lim %05d/%05d/%05d\n",
+ er->data.cleartext_features, er->data.cleartext_auths,
+ er->data.crypted_features, er->data.crypted_auths,
+ er->data.limit_mail, er->data.limit_rcpt, er->data.limit_rcptdom);
+ else
+#endif
+ debug_printf("EHLO response bits from cache:"
+ " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
+ er->data.cleartext_features, er->data.cleartext_auths,
+ er->data.crypted_features, er->data.crypted_auths);
+
sx->ehlo_resp = er->data;
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ ehlo_cache_limits_apply(sx);
+#endif
dbfn_close(dbm_file);
- DEBUG(D_transport) debug_printf(
- "EHLO response bits from cache: cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
- er->data.cleartext_features, er->data.cleartext_auths,
- er->data.crypted_features, er->data.crypted_auths);
return TRUE;
}
dbfn_close(dbm_file);
goto fail;
}
- /* Compare the actual EHLO response to the cached value we assumed;
- on difference, dump or rewrite the cache and arrange for a retry. */
+ /* Compare the actual EHLO response extensions and AUTH methods to the cached
+ value we assumed; on difference, dump or rewrite the cache and arrange for a
+ retry. */
ap = tls_out.active.sock < 0
? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
| OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
| OPTION_UTF8 | OPTION_EARLY_PIPE
);
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ if (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
+ ehlo_response_limits_read(sx);
+#endif
if ( peer_offered != sx->peer_offered
|| (authbits = study_ehlo_auths(sx)) != *ap)
{
debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
tls_out.active.sock < 0 ? "cleartext" : "crypted",
sx->peer_offered, *ap, peer_offered, authbits);
- *(tls_out.active.sock < 0
- ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
- *ap = authbits;
if (peer_offered & OPTION_EARLY_PIPE)
+ {
+ *(tls_out.active.sock < 0
+ ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) =
+ peer_offered;
+ *ap = authbits;
write_ehlo_cache_entry(sx);
+ }
else
invalidate_ehlo_cache_entry(sx);
return OK; /* just carry on */
}
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ /* If we are handling LIMITS, compare the actual EHLO LIMITS values with the
+ cached values and invalidate cache if different. OK to carry on with
+ connect since values are advisory. */
+ {
+ if ( (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
+ && ( sx->peer_limit_mail != sx->ehlo_resp.limit_mail
+ || sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt
+ || sx->peer_limit_rcptdom != sx->ehlo_resp.limit_rcptdom
+ ) )
+ {
+ HDEBUG(D_transport)
+ {
+ debug_printf("EHLO LIMITS changed:");
+ if (sx->peer_limit_mail != sx->ehlo_resp.limit_mail)
+ debug_printf(" MAILMAX %u -> %u\n", sx->ehlo_resp.limit_mail, sx->peer_limit_mail);
+ else if (sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt)
+ debug_printf(" RCPTMAX %u -> %u\n", sx->ehlo_resp.limit_rcpt, sx->peer_limit_rcpt);
+ else
+ debug_printf(" RCPTDOMAINMAX %u -> %u\n", sx->ehlo_resp.limit_rcptdom, sx->peer_limit_rcptdom);
+ }
+ invalidate_ehlo_cache_entry(sx);
+ }
+ }
+#endif
}
return OK;
(void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
return rc;
}
-#endif
+#endif /*!DISABLE_PIPE_CONNECT*/
/*************************************************
{
DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
count--;
- sx->pending_MAIL = FALSE;
+ sx->pending_MAIL = sx->RCPT_452 = FALSE;
if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
'2', ob->command_timeout))
{
/* The address was accepted */
addr->host_used = sx->conn_args.host;
- DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
+ DEBUG(D_transport) debug_printf("%s expect rcpt for %s\n", __FUNCTION__, addr->address);
if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
'2', ob->command_timeout))
{
if (addr->more_errno >> 8 == 52 && yield & 3)
{
- if (!sx->RCPT_452)
+ if (!sx->RCPT_452) /* initialised at MAIL-ack above */
{
DEBUG(D_transport)
debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
}
}
}
+ if (count && !(addr = addr->next))
+ return -2;
} /* Loop for next RCPT response */
/* Update where to start at for the next block of responses, unless we
if (require_auth == OK && !f.smtp_authenticated)
{
+#ifndef DISABLE_PIPE_CONNECT
invalidate_ehlo_cache_entry(sx);
+#endif
set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
string_sprintf("authentication required but %s", fail_reason), DEFER,
FALSE, &sx->delivery_start);
current_local_identity =
smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
-if (!(new_sender_address = deliver_get_sender_address(message_id)))
- return FALSE;
+if (!(new_sender_address = spool_sender_from_msgid(message_id)))
+ return FALSE;
+
message_local_identity =
smtp_local_identity(new_sender_address, s_compare->tblock);
-
-
/*************************************************
* Make connection for given message *
*************************************************/
/*
Arguments:
- ctx connection context
+ sx connection context
suppress_tls if TRUE, don't attempt a TLS connection - this is set for
a second attempt after TLS initialization fails
/* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
#endif
-if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
+if ((sx->max_mail = sx->conn_args.tblock->connection_max_messages) == 0) sx->max_mail = 999999;
+if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
/* sx->peer_offered = 0; */
/* sx->avoid_option = 0; */
sx->igquotstr = US"";
DEFER, FALSE, &sx->delivery_start);
return ERROR;
}
-#endif
+#else
/* If we have a proxied TLS connection, check usability for this message */
int rc;
const uschar * sni = US"";
-#ifdef SUPPORT_DANE
+# ifdef SUPPORT_DANE
/* Check if the message will be DANE-verified; if so force its SNI */
tls_out.dane_verified = FALSE;
{
case OK: sx->conn_args.dane = TRUE;
ob->tls_tempfail_tryclear = FALSE; /* force TLS */
- ob->tls_sni = sx->first_addr->domain; /* force SNI */
+ ob->tls_sni = sx->conn_args.host->name; /* force SNI */
break;
case FAIL_FORCED: break;
default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
string_sprintf("DANE error: tlsa lookup %s",
rc_to_string(rc)),
rc, FALSE, &sx->delivery_start);
-# ifndef DISABLE_EVENT
+# ifndef DISABLE_EVENT
(void) event_raise(sx->conn_args.tblock->event_action,
US"dane:fail", sx->dane_required
? US"dane-required" : US"dnssec-invalid");
-# endif
+# endif
return rc;
}
-#endif
+# endif
/* If the SNI or the DANE status required for the new message differs from the
existing conn drop the connection to force a new one. */
"<%s>: failed to expand transport's tls_sni value: %s",
sx->addrlist->address, expand_string_message);
-#ifdef SUPPORT_DANE
+# ifdef SUPPORT_DANE
if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
&& continue_proxy_dane == sx->conn_args.dane)
{
if ((tls_out.dane_verified = continue_proxy_dane))
sx->conn_args.host->dnssec = DS_YES;
}
-#else
+# else
if ((continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni))
tls_out.sni = US sni;
-#endif
+# endif
else
{
DEBUG(D_transport)
back through reporting pipe. */
}
}
-
+#endif /*!DISABLE_TLS*/
/* Make a connection to the host if this isn't a continued delivery, and handle
the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
if (sx->verify)
HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
+ /* Arrange to report to calling process this is a new connection */
+
+ clearflag(sx->first_addr, af_cont_conn);
+ setflag(sx->first_addr, af_new_conn);
+
/* Get the actual port the connection will use, into sx->conn_args.host */
smtp_port_for_connect(sx->conn_args.host, sx->port);
{
case OK: sx->conn_args.dane = TRUE;
ob->tls_tempfail_tryclear = FALSE; /* force TLS */
- ob->tls_sni = sx->first_addr->domain; /* force SNI */
+ ob->tls_sni = sx->conn_args.host->name; /* force SNI */
break;
case FAIL_FORCED: break;
default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
sx->cctx.tls_ctx = NULL;
sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom =
+#endif
sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
#ifndef DISABLE_PIPE_CONNECT
else
#endif
{
- if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
+ blob lazy_conn = {.data = NULL};
+ /* For TLS-connect, a TFO lazy-connect is useful since the Client Hello
+ can go on the TCP SYN. */
+
+ if ((sx->cctx.sock = smtp_connect(&sx->conn_args,
+ sx->smtps ? &lazy_conn : NULL)) < 0)
{
set_errno_nohost(sx->addrlist,
errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
sx->send_quit = FALSE;
return DEFER;
}
+#ifdef TCP_QUICKACK
+ (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
+ sizeof(off));
+#endif
}
/* Expand the greeting message while waiting for the initial response. (Makes
sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
else
#endif
{
-#ifdef TCP_QUICKACK
- (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
- sizeof(off));
-#endif
if (!smtp_reap_banner(sx))
goto RESPONSE_FAILED;
}
int n = sizeof(sx->buffer);
uschar * rsp = sx->buffer;
- if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
- { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
+ if (sx->esmtp_sent && (n = Ustrlen(sx->buffer) + 1) < sizeof(sx->buffer)/2)
+ { rsp = sx->buffer + n; n = sizeof(sx->buffer) - n; }
if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
goto SEND_FAILED;
)
#endif
);
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
+ {
+ ehlo_response_limits_read(sx);
+ ehlo_response_limits_apply(sx);
+ }
+#endif
#ifndef DISABLE_PIPE_CONNECT
if (sx->early_pipe_ok)
{
sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
smtp_command = big_buffer;
sx->peer_offered = smtp_peer_options;
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ /* Limits passed by cmdline over exec. */
+ ehlo_limits_apply(sx,
+ sx->peer_limit_mail = continue_limit_mail,
+ sx->peer_limit_rcpt = continue_limit_rcpt,
+ sx->peer_limit_rcptdom = continue_limit_rcptdom);
+#endif
sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
/* For a continued connection with TLS being proxied for us, or a
#ifndef DISABLE_PIPE_CONNECT
/* If doing early-pipelining reap the banner and EHLO-response but leave
- the response for the STARTTLS we just sent alone. */
+ the response for the STARTTLS we just sent alone. On fail, assume wrong
+ cached capability and retry with the pipelining disabled. */
if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
{
sx->send_quit = FALSE;
goto TLS_FAILED;
}
+ sx->send_tlsclose = TRUE;
/* TLS session is set up. Check the inblock fill level. If there is
content then as we have not yet done a tls read it must have arrived before
DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
}
#endif
+#ifdef EXPERIMMENTAL_ESMTP_LIMITS
+ /* As we are about to send another EHLO, forget any LIMITS received so far. */
+ sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom = 0;
+ if ((sx->max_mail = sx->conn_args.tblock->connection_max_message) == 0) sx->max_mail = 999999;
+ if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
+ sx->single_rcpt_domain = FALSE;
+#endif
/* For SMTPS we need to wait for the initial OK response. */
if (sx->smtps)
continued session down a previously-used socket, we haven't just done EHLO, so
we skip this. */
-if (continue_hostname == NULL
+if ( !continue_hostname
#ifndef DISABLE_TLS
|| tls_out.active.sock >= 0
#endif
if (tls_out.active.sock >= 0)
sx->ehlo_resp.crypted_features = sx->peer_offered;
#endif
+
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
+ {
+ ehlo_response_limits_read(sx);
+ ehlo_response_limits_apply(sx);
+ }
+#endif
}
/* Set for IGNOREQUOTA if the response to LHLO specifies support and the
#ifndef DISABLE_TLS
if (sx->cctx.tls_ctx)
{
- tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
+ if (sx->send_tlsclose)
+ {
+ tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
+ sx->send_tlsclose = FALSE;
+ }
sx->cctx.tls_ctx = NULL;
}
#endif
/* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
- addr && address_count < sx->max_rcpt;
+ addr && address_count < sx->max_rcpt; /*XXX maybe also || sx->single_rcpt_domain ? */
addr = addr->next) if (addr->transport_return == PENDING_DEFER)
{
address_count++;
smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
{
address_item * addr;
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+address_item * restart_addr = NULL;
+#endif
int address_count, pipe_limit;
int rc;
For verify we flush the pipeline after any (the only) rcpt address. */
for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
- addr && address_count < sx->max_rcpt;
+ addr && address_count < sx->max_rcpt;
addr = addr->next) if (addr->transport_return == PENDING_DEFER)
{
int cmds_sent;
BOOL no_flush;
uschar * rcpt_addr;
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ if ( sx->single_rcpt_domain /* restriction on domains */
+ && address_count > 0 /* not first being sent */
+ && Ustrcmp(addr->domain, sx->first_addr->domain) != 0 /* dom diff from first */
+ )
+ {
+ DEBUG(D_transport) debug_printf("skipping different domain %s\n", addr->domain);
+
+ /* Ensure the smtp-response reaper does not think the address had a RCPT
+ command sent for it. Reset to PENDING_DEFER in smtp_deliver(), where we
+ goto SEND_MESSAGE. */
+
+ addr->transport_return = SKIP;
+ if (!restart_addr) restart_addr = addr; /* note restart point */
+ continue; /* skip this one */
+ }
+#endif
+
addr->dsn_aware = sx->peer_offered & OPTION_DSN
? dsn_support_yes : dsn_support_no;
}
} /* Loop for next address */
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+sx->next_addr = restart_addr ? restart_addr : addr;
+#else
sx->next_addr = addr;
+#endif
return 0;
}
fd_set rfds, efds;
int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
int rc, i;
+BOOL send_tls_shutdown = TRUE;
close(pfd[1]);
if ((rc = exim_fork(US"tls-proxy")))
goto done;
}
+ /* For errors where not readable, bomb out */
+
if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
{
DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
- goto done;
+ if (!(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)))
+ goto done;
+ DEBUG(D_transport) debug_printf("- but also readable; no exit yet\n");
}
}
while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
/* handle inbound data */
if (FD_ISSET(tls_out.active.sock, &rfds))
- if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
- {
+ if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) /* Expect -1 for EOF; */
+ { /* that reaps the TLS Close Notify record */
fd_bits &= ~1;
FD_CLR(tls_out.active.sock, &rfds);
shutdown(pfd[0], SHUT_WR);
timeout = 5;
}
else
- {
for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
- }
- else if (fd_bits & 1)
- FD_SET(tls_out.active.sock, &rfds);
- /* handle outbound data */
+ /* Handle outbound data. We cannot combine payload and the TLS-close
+ due to the limitations of the (pipe) channel feeding us. Maybe use a unix-domain
+ socket? */
if (FD_ISSET(pfd[0], &rfds))
if ((rc = read(pfd[0], buf, bsize)) <= 0)
{
- fd_bits = 0;
- tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
- ct_ctx = NULL;
+ fd_bits &= ~2;
+ FD_CLR(pfd[0], &rfds);
+
+# ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
+ (void) setsockopt(tls_out.active.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
+# endif
+ tls_shutdown_wr(ct_ctx);
+ send_tls_shutdown = FALSE;
+ shutdown(tls_out.active.sock, SHUT_WR);
}
else
- {
for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
goto done;
- }
- else if (fd_bits & 2)
- FD_SET(pfd[0], &rfds);
+
+ if (fd_bits & 1) FD_SET(tls_out.active.sock, &rfds);
+ if (fd_bits & 2) FD_SET(pfd[0], &rfds);
}
done:
+ if (send_tls_shutdown) tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
+ ct_ctx = NULL;
testharness_pause_ms(100); /* let logging complete */
exim_exit(EXIT_SUCCESS);
}
int save_errno;
int rc;
-BOOL pass_message = FALSE;
uschar *message = NULL;
uschar new_message_id[MESSAGE_ID_LENGTH + 1];
smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
+BOOL pass_message = FALSE;
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+BOOL mail_limit = FALSE;
+#endif
#ifdef SUPPORT_DANE
BOOL dane_held;
#endif
+BOOL tcw_done = FALSE, tcw = FALSE;
*message_defer = FALSE;
gettimeofday(&sx->delivery_start, NULL);
sx->sync_addr = sx->first_addr = addrlist;
+REPEAT_CONN:
#ifdef SUPPORT_DANE
-DANE_DOMAINS:
dane_held = FALSE;
#endif
report_time_since(&t0, US"dkim_exim_sign_init (delta)");
# endif
}
+#endif
+
+ /* See if we can pipeline QUIT. Reasons not to are
+ - pipelining not active
+ - not ok to send quit
+ - errors in amtp transation responses
+ - more addrs to send for this message or this host
+ - this message was being retried
+ - more messages for this host
+ If we can, we want the message-write to not flush (the tail end of) its data out. */
+
+ if ( sx->pipelining_used
+ && (sx->ok && sx->completed_addr || sx->peer_offered & OPTION_CHUNKING)
+ && sx->send_quit
+ && !(sx->first_addr || f.continue_more)
+ && f.deliver_firsttime
+ )
+ {
+ smtp_compare_t t_compare =
+ {.tblock = tblock, .current_sender_address = sender_address};
+
+ tcw_done = TRUE;
+ tcw =
+#ifndef DISABLE_TLS
+ ( tls_out.active.sock < 0 && !continue_proxy_cipher
+ || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
+ )
+ &&
+#endif
+ transport_check_waiting(tblock->name, host->name,
+ tblock->connection_max_messages, new_message_id,
+ (oicf)smtp_are_same_identities, (void*)&t_compare);
+ if (!tcw)
+ {
+ HDEBUG(D_transport) debug_printf("will pipeline QUIT\n");
+ tctx.options |= topt_no_flush;
+ }
+ }
+
+#ifndef DISABLE_DKIM
sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
#else
sx->ok = transport_write_message(&tctx, 0);
smtp_command = US"end of data";
+ /* If we can pipeline a QUIT with the data them send it now. If a new message
+ for this host appeared in the queue while data was being sent, we will not see
+ it and it will have to wait for a queue run. If there was one but another
+ thread took it, we might attempt to send it - but locking of spoolfiles will
+ detect that. Use _MORE to get QUIT in FIN segment. */
+
+ if (tcw_done && !tcw)
+ {
+ /*XXX jgh 2021/03/10 google et. al screwup. G, at least, sends TCP FIN in response to TLS
+ close-notify. Under TLS 1.3, violating RFC.
+ However, TLS 1.2 does not have half-close semantics. */
+
+ if ( sx->cctx.tls_ctx
+#if 0 && !defined(DISABLE_TLS)
+ && Ustrcmp(tls_out.ver, "TLS1.3") != 0
+#endif
+ || !f.deliver_firsttime
+ )
+ { /* Send QUIT now and not later */
+ (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
+ sx->send_quit = FALSE;
+ }
+ else
+ { /* add QUIT to the output buffer */
+ (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
+ sx->send_quit = FALSE; /* avoid sending it later */
+
+#ifndef DISABLE_TLS
+ if (sx->cctx.tls_ctx) /* need to send TLS Cloe Notify */
+ {
+# ifdef EXIM_TCP_CORK /* Use _CORK to get Close Notify in FIN segment */
+ (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
+# endif
+ tls_shutdown_wr(sx->cctx.tls_ctx);
+ sx->send_tlsclose = FALSE; /* avoid later repeat */
+ }
+#endif
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
+ shutdown(sx->cctx.sock, SHUT_WR); /* flush output buffer, with TCP FIN */
+ }
+ }
+
if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
{
/* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
!sx->lmtp
)
{
- const uschar *s = string_printing(sx->buffer);
+ const uschar * s = string_printing(sx->buffer);
/* deconst cast ok here as string_printing was checked to have alloc'n'copied */
- conf = (s == sx->buffer)? US string_copy(s) : US s;
+ conf = s == sx->buffer ? US string_copy(s) : US s;
}
/* Process all transported addresses - for LMTP or PRDR, read a status for
- each one. */
+ each one. We used to drop out at first_addr, until someone returned a 452
+ followed by a 250... and we screwed up the accepted addresses. */
- for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
+ for (address_item * addr = addrlist; addr; addr = addr->next)
{
if (addr->transport_return != PENDING_OK) continue;
else
sprintf(CS sx->buffer, "%.500s\n", addr->unique);
- DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx->buffer);
+ DEBUG(D_deliver) debug_printf("S:journalling %s", sx->buffer);
len = Ustrlen(CS sx->buffer);
if (write(journal_fd, sx->buffer, len) != len)
log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
{
save_errno = errno;
message = NULL;
- sx->send_quit = check_response(host, &save_errno, addrlist->more_errno,
+ /* Clear send_quit flag if needed. Do not set. */
+ sx->send_quit &= check_response(host, &save_errno, addrlist->more_errno,
sx->buffer, &code, &message, &pass_message);
goto FAILED;
}
*message_defer = TRUE;
}
+#ifdef TIOCOUTQ
+ DEBUG(D_transport) if (sx->cctx.sock >= 0)
+ {
+ int n;
+ if (ioctl(sx->cctx.sock, TIOCOUTQ, &n) == 0)
+ debug_printf("%d bytes remain in socket output buffer\n", n);
+ }
+#endif
}
-
/* Otherwise, we have an I/O error or a timeout other than after MAIL or
".", or some other transportation error. We defer all addresses and yield
DEFER, except for the case of failed add_headers expansion, or a transport
sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
if (sx->completed_addr && sx->ok && sx->send_quit)
- {
- smtp_compare_t t_compare;
-
- t_compare.tblock = tblock;
- t_compare.current_sender_address = sender_address;
-
- if ( sx->first_addr != NULL /* more addrs for this message */
- || f.continue_more /* more addrs for coninued-host */
- || (
-#ifndef DISABLE_TLS
- ( tls_out.active.sock < 0 && !continue_proxy_cipher
- || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
- )
- &&
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ if (mail_limit = continue_sequence >= sx->max_mail)
+ {
+ DEBUG(D_transport)
+ debug_printf("reached limit %u for MAILs per conn\n", sx->max_mail);
+ }
+ else
#endif
- transport_check_waiting(tblock->name, host->name,
- tblock->connection_max_messages, new_message_id,
- (oicf)smtp_are_same_identities, (void*)&t_compare)
- ) )
{
- uschar *msg;
- BOOL pass_message;
-
- if (sx->send_rset)
- if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
- {
- msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
- host->address, strerror(errno));
- sx->send_quit = FALSE;
- }
- else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
- '2', ob->command_timeout)))
- {
- int code;
- sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
- &pass_message);
- if (!sx->send_quit)
- {
- DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
- host->name, host->address, msg);
- }
- }
-
- /* Either RSET was not needed, or it succeeded */
+ smtp_compare_t t_compare =
+ {.tblock = tblock, .current_sender_address = sender_address};
- if (sx->ok)
- {
+ if ( sx->first_addr /* more addrs for this message */
+ || f.continue_more /* more addrs for continued-host */
+ || tcw_done && tcw /* more messages for host */
+ || (
#ifndef DISABLE_TLS
- int pfd[2];
+ ( tls_out.active.sock < 0 && !continue_proxy_cipher
+ || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
+ )
+ &&
#endif
- int socket_fd = sx->cctx.sock;
+ transport_check_waiting(tblock->name, host->name,
+ sx->max_mail, new_message_id,
+ (oicf)smtp_are_same_identities, (void*)&t_compare)
+ ) )
+ {
+ uschar *msg;
+ BOOL pass_message;
+ if (sx->send_rset)
+ if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
+ {
+ msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
+ host->address, strerror(errno));
+ sx->send_quit = FALSE;
+ }
+ else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
+ '2', ob->command_timeout)))
+ {
+ int code;
+ sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
+ &pass_message);
+ if (!sx->send_quit)
+ {
+ DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
+ host->name, host->address, msg);
+ }
+ }
- if (sx->first_addr != NULL) /* More addresses still to be sent */
- { /* for this message */
- continue_sequence++; /* Causes * in logging */
- pipelining_active = sx->pipelining_used; /* was cleared at DATA */
- goto SEND_MESSAGE;
- }
+ /* Either RSET was not needed, or it succeeded */
+
+ if (sx->ok)
+ {
+#ifndef DISABLE_TLS
+ int pfd[2];
+#endif
+ int socket_fd = sx->cctx.sock;
+
+ if (sx->first_addr) /* More addresses still to be sent */
+ { /* for this message */
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ /* Any that we marked as skipped, reset to do now */
+ for (address_item * a = sx->first_addr; a; a = a->next)
+ if (a->transport_return == SKIP)
+ a->transport_return = PENDING_DEFER;
+#endif
+ continue_sequence++; /* for consistency */
+ clearflag(sx->first_addr, af_new_conn);
+ setflag(sx->first_addr, af_cont_conn); /* Causes * in logging */
+ pipelining_active = sx->pipelining_used; /* was cleared at DATA */
+ goto SEND_MESSAGE;
+ }
- /* Unless caller said it already has more messages listed for this host,
- pass the connection on to a new Exim process (below, the call to
- transport_pass_socket). If the caller has more ready, just return with
- the connection still open. */
+ /* Unless caller said it already has more messages listed for this host,
+ pass the connection on to a new Exim process (below, the call to
+ transport_pass_socket). If the caller has more ready, just return with
+ the connection still open. */
#ifndef DISABLE_TLS
- if (tls_out.active.sock >= 0)
- if ( f.continue_more
- || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
- {
- /* Before passing the socket on, or returning to caller with it still
- open, we must shut down TLS. Not all MTAs allow for the continuation
- of the SMTP session when TLS is shut down. We test for this by sending
- a new EHLO. If we don't get a good response, we don't attempt to pass
- the socket on. */
+ if (tls_out.active.sock >= 0)
+ if ( f.continue_more
+ || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
+ {
+ /* Before passing the socket on, or returning to caller with it still
+ open, we must shut down TLS. Not all MTAs allow for the continuation
+ of the SMTP session when TLS is shut down. We test for this by sending
+ a new EHLO. If we don't get a good response, we don't attempt to pass
+ the socket on. */
tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
+ sx->send_tlsclose = FALSE;
sx->cctx.tls_ctx = NULL;
tls_out.active.sock = -1;
smtp_peer_options = smtp_peer_options_wrap;
&& smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
'2', ob->command_timeout);
- if (sx->ok && f.continue_more)
- goto TIDYUP; /* More addresses for another run */
- }
- else
- {
- /* Set up a pipe for proxying TLS for the new transport process */
-
- smtp_peer_options |= OPTION_TLS;
- if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
- socket_fd = pfd[1];
+ if (sx->ok && f.continue_more)
+ goto TIDYUP; /* More addresses for another run */
+ }
else
- set_errno(sx->first_addr, errno, US"internal allocation problem",
- DEFER, FALSE, host,
+ {
+ /* Set up a pipe for proxying TLS for the new transport process */
+
+ smtp_peer_options |= OPTION_TLS;
+ if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
+ socket_fd = pfd[1];
+ else
+ set_errno(sx->first_addr, errno, US"internal allocation problem",
+ DEFER, FALSE, host,
# ifdef EXPERIMENTAL_DSN_INFO
- sx->smtp_greeting, sx->helo_response,
+ sx->smtp_greeting, sx->helo_response,
# endif
- &sx->delivery_start);
- }
- else
+ &sx->delivery_start);
+ }
+ else
#endif
- if (f.continue_more)
- goto TIDYUP; /* More addresses for another run */
+ if (f.continue_more)
+ goto TIDYUP; /* More addresses for another run */
- /* If the socket is successfully passed, we mustn't send QUIT (or
- indeed anything!) from here. */
+ /* If the socket is successfully passed, we mustn't send QUIT (or
+ indeed anything!) from here. */
-/*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
-propagate it from the initial
-*/
- if (sx->ok && transport_pass_socket(tblock->name, host->name,
- host->address, new_message_id, socket_fd))
- {
- sx->send_quit = FALSE;
-
- /* We have passed the client socket to a fresh transport process.
- If TLS is still active, we need to proxy it for the transport we
- just passed the baton to. Fork a child to to do it, and return to
- get logging done asap. Which way to place the work makes assumptions
- about post-fork prioritisation which may not hold on all platforms. */
-#ifndef DISABLE_TLS
- if (tls_out.active.sock >= 0)
+ /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
+ propagate it from the initial
+ */
+ if (sx->ok && transport_pass_socket(tblock->name, host->name,
+ host->address, new_message_id, socket_fd
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+ , sx->peer_limit_mail, sx->peer_limit_rcpt, sx->peer_limit_rcptdom
+#endif
+ ))
{
- int pid = exim_fork(US"tls-proxy-interproc");
- if (pid == 0) /* child; fork again to disconnect totally */
- {
- /* does not return */
- smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
- ob->command_timeout);
- }
+ sx->send_quit = FALSE;
- if (pid > 0) /* parent */
+ /* We have passed the client socket to a fresh transport process.
+ If TLS is still active, we need to proxy it for the transport we
+ just passed the baton to. Fork a child to to do it, and return to
+ get logging done asap. Which way to place the work makes assumptions
+ about post-fork prioritisation which may not hold on all platforms. */
+#ifndef DISABLE_TLS
+ if (tls_out.active.sock >= 0)
{
- close(pfd[0]);
- /* tidy the inter-proc to disconn the proxy proc */
- waitpid(pid, NULL, 0);
- tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
- sx->cctx.tls_ctx = NULL;
- (void)close(sx->cctx.sock);
- sx->cctx.sock = -1;
- continue_transport = NULL;
- continue_hostname = NULL;
- goto TIDYUP;
+ int pid = exim_fork(US"tls-proxy-interproc");
+ if (pid == 0) /* child; fork again to disconnect totally */
+ {
+ /* does not return */
+ smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
+ ob->command_timeout);
+ }
+
+ if (pid > 0) /* parent */
+ {
+ close(pfd[0]);
+ /* tidy the inter-proc to disconn the proxy proc */
+ waitpid(pid, NULL, 0);
+ tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
+ sx->cctx.tls_ctx = NULL;
+ (void)close(sx->cctx.sock);
+ sx->cctx.sock = -1;
+ continue_transport = NULL;
+ continue_hostname = NULL;
+ goto TIDYUP;
+ }
+ log_write(0, LOG_PANIC_DIE, "fork failed");
}
- log_write(0, LOG_PANIC_DIE, "fork failed");
- }
#endif
+ }
}
- }
- /* If RSET failed and there are addresses left, they get deferred. */
- else
- set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
+ /* If RSET failed and there are addresses left, they get deferred. */
+ else
+ set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
#ifdef EXPERIMENTAL_DSN_INFO
- sx->smtp_greeting, sx->helo_response,
+ sx->smtp_greeting, sx->helo_response,
#endif
- &sx->delivery_start);
+ &sx->delivery_start);
+ }
}
- }
/* End off tidily with QUIT unless the connection has died or the socket has
-been passed to another process. There has been discussion on the net about what
-to do after sending QUIT. The wording of the RFC suggests that it is necessary
-to wait for a response, but on the other hand, there isn't anything one can do
-with an error response, other than log it. Exim used to do that. However,
-further discussion suggested that it is positively advantageous not to wait for
-the response, but to close the session immediately. This is supposed to move
-the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
-load from the server. (Hosts that are both servers and clients may not see much
-difference, of course.) Further discussion indicated that this was safe to do
-on Unix systems which have decent implementations of TCP/IP that leave the
-connection around for a while (TIME_WAIT) after the application has gone away.
-This enables the response sent by the server to be properly ACKed rather than
-timed out, as can happen on broken TCP/IP implementations on other OS.
-
-This change is being made on 31-Jul-98. After over a year of trouble-free
-operation, the old commented-out code was removed on 17-Sep-99. */
+been passed to another process. */
SEND_QUIT:
-#ifdef TCP_CORK
-(void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
+if (sx->send_quit)
+ { /* Use _MORE to get QUIT in FIN segment */
+ (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
+#ifndef DISABLE_TLS
+ if (sx->cctx.tls_ctx)
+ {
+# ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
+ (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
+# endif
+ tls_shutdown_wr(sx->cctx.tls_ctx);
+ sx->send_tlsclose = FALSE;
+ }
#endif
-if (sx->send_quit) (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
+ }
END_OFF:
-#ifndef DISABLE_TLS
-tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
-sx->cctx.tls_ctx = NULL;
-#endif
-
/* Close the socket, and return the appropriate value, first setting
works because the NULL setting is passed back to the calling process, and
remote_max_parallel is forced to 1 when delivering over an existing connection,
specified in the transports, and therefore not visible at top level, in which
case continue_more won't get set. */
-HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
if (sx->send_quit)
{
+ /* This flushes data queued in the socket, being the QUIT and any TLS Close,
+ sending them along with the client FIN flag. Us (we hope) sending FIN first
+ means we (client) take the TIME_WAIT state, so the server (which likely has a
+ higher connection rate) does not have to. */
+
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
shutdown(sx->cctx.sock, SHUT_WR);
+ }
+
+if (sx->send_quit || tcw_done && !tcw)
+ {
+ /* Wait for (we hope) ack of our QUIT, and a server FIN. Discard any data
+ received, then discard the socket. Any packet received after then, or receive
+ data still in the socket, will get a RST - hence the pause/drain. */
+
+ /* Reap the response to QUIT, timing out after one second */
+ (void) smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', 1);
+#ifndef DISABLE_TLS
+ if (sx->cctx.tls_ctx)
+ {
+ int n;
+
+ /* Reap the TLS Close Notify from the server, timing out after one second */
+ sigalrm_seen = FALSE;
+ ALARM(1);
+ do
+ n = tls_read(sx->cctx.tls_ctx, sx->inbuffer, sizeof(sx->inbuffer));
+ while (!sigalrm_seen && n > 0);
+ ALARM_CLR(0);
+
+# ifdef EXIM_TCP_CORK
+ (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
+# endif
+ tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
+ sx->cctx.tls_ctx = NULL;
+ }
+#endif
millisleep(20);
- testharness_pause_ms(200);
if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
- for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
- i--; /* drain socket */
+ for (int i = 16, n; /* drain socket */
+ (n = read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer))) > 0 && i > 0;
+ i--) HDEBUG(D_transport|D_acl|D_v)
+ {
+ int m = MIN(n, 64);
+ debug_printf_indent(" SMTP(drain %d bytes)<< %.*s\n", n, m, sx->inbuffer);
+ for (m = 0; m < n; m++)
+ debug_printf("0x%02x\n", sx->inbuffer[m]);
+ }
}
+HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
(void)close(sx->cctx.sock);
+sx->cctx.sock = -1;
+continue_transport = NULL;
+continue_hostname = NULL;
#ifndef DISABLE_EVENT
(void) event_raise(tblock->event_action, US"tcp:close", NULL);
to get the domain string for SNI */
sx->first_addr = a;
+ clearflag(a, af_cont_conn);
+ setflag(a, af_new_conn); /* clear * from logging */
DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
}
}
- goto DANE_DOMAINS;
+ continue_sequence = 1; /* for consistency */
+ goto REPEAT_CONN;
+ }
+#endif
+
+#ifdef EXPERIMENTAL_ESMTP_LIMITS
+if (mail_limit && sx->first_addr)
+ {
+ /* Reset the sequence count since we closed the connection. This is flagged
+ on the pipe back to the delivery process so that a non-continued-conn delivery
+ is logged. */
+
+ continue_sequence = 1; /* for consistency */
+ clearflag(sx->first_addr, af_cont_conn);
+ setflag(sx->first_addr, af_new_conn); /* clear * from logging */
+ goto REPEAT_CONN;
}
#endif
-continue_transport = NULL;
-continue_hostname = NULL;
return yield;
TIDYUP:
{
uschar *s = ob->hosts;
- if (Ustrchr(s, '$') != NULL)
+ if (Ustrchr(s, '$'))
{
if (!(expanded_hosts = expand_string(s)))
{
because connections to the same host from a different interface should be
treated separately. */
- host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
+ host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
{
uschar * s = ob->interface;
if (s && *s)
git://git.exim.org / exim.git / blobdiff