X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/2d280592a7f859d1e06738d86c3bc43382f1b791..584e96c65f12aca9414450b656504af6e3f7a399:/src/src/smtp_out.c diff --git a/src/src/smtp_out.c b/src/src/smtp_out.c index df4dc5a4f..76181b5f1 100644 --- a/src/src/smtp_out.c +++ b/src/src/smtp_out.c @@ -1,16 +1,15 @@ -/* $Cambridge: exim/src/src/smtp_out.c,v 1.6 2005/08/08 15:02:48 ph10 Exp $ */ - /************************************************* * Exim - an Internet mail transport agent * *************************************************/ -/* Copyright (c) University of Cambridge 1995 - 2005 */ +/* Copyright (c) University of Cambridge 1995 - 2016 */ /* See the file NOTICE for conditions of use and distribution. */ /* A number of functions for driving outgoing SMTP calls. */ #include "exim.h" +#include "transports/smtp.h" @@ -27,7 +26,6 @@ Arguments: which case the function does nothing host_af AF_INET or AF_INET6 for the outgoing IP address addr the mail address being handled (for setting errors) - changed if not NULL, set TRUE if expansion actually changed istring interface point this to the interface msg to add to any error message @@ -37,9 +35,9 @@ Returns: TRUE on success, FALSE on failure, with error message BOOL smtp_get_interface(uschar *istring, int host_af, address_item *addr, - BOOL *changed, uschar **interface, uschar *msg) + uschar **interface, uschar *msg) { -uschar *expint; +const uschar * expint; uschar *iface; int sep = 0; @@ -55,8 +53,6 @@ if (expint == NULL) return FALSE; } -if (changed != NULL) *changed = expint != istring; - while (isspace(*expint)) expint++; if (*expint == 0) return TRUE; @@ -145,69 +141,55 @@ return TRUE; -/************************************************* -* Connect to remote host * -*************************************************/ - -/* Create a socket, and connect it to a remote host. IPv6 addresses are -detected by checking for a colon in the address. AF_INET6 is defined even on -non-IPv6 systems, to enable the code to be less messy. However, on such systems -host->address will always be an IPv4 address. - -The port field in the host item is used if it is set (usually router from SRV -records or elsewhere). In other cases, the default passed as an argument is -used, and the host item is updated with its value. - -Arguments: - host host item containing name and address (and sometimes port) - host_af AF_INET or AF_INET6 - port default remote port to connect to, in host byte order, for those - hosts whose port setting is PORT_NONE - interface outgoing interface address or NULL - timeout timeout value or 0 - keepalive TRUE to use keepalive - -Returns: connected socket number, or -1 with errno set -*/ - int -smtp_connect(host_item *host, int host_af, int port, uschar *interface, - int timeout, BOOL keepalive) +smtp_sock_connect(host_item * host, int host_af, int port, uschar * interface, + transport_instance * tb, int timeout) { +smtp_transport_options_block * ob = + (smtp_transport_options_block *)tb->options_block; +const uschar * dscp = ob->dscp; +int dscp_value; +int dscp_level; +int dscp_option; +int sock; int on = 1; int save_errno = 0; -int sock; -if (host->port != PORT_NONE) - { - HDEBUG(D_transport|D_acl|D_v) - debug_printf("Transport port=%d replaced by host-specific port=%d\n", port, - host->port); - port = host->port; - } -else host->port = port; /* Set the port actually used */ - -HDEBUG(D_transport|D_acl|D_v) - { - if (interface == NULL) - debug_printf("Connecting to %s [%s]:%d ... ",host->name,host->address,port); - else - debug_printf("Connecting to %s [%s]:%d from %s ... ", host->name, - host->address, port, interface); - } - -/* Create the socket */ +#ifndef DISABLE_EVENT +deliver_host_address = host->address; +deliver_host_port = port; +if (event_raise(tb->event_action, US"tcp:connect", NULL)) return -1; +#endif if ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return -1; /* Set TCP_NODELAY; Exim does its own buffering. */ -setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (uschar *)(&on), sizeof(on)); +if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, US &on, sizeof(on))) + HDEBUG(D_transport|D_acl|D_v) + debug_printf("failed to set NODELAY: %s ", strerror(errno)); + +/* Set DSCP value, if we can. For now, if we fail to set the value, we don't +bomb out, just log it and continue in default traffic class. */ + +if (dscp && dscp_lookup(dscp, host_af, &dscp_level, &dscp_option, &dscp_value)) + { + HDEBUG(D_transport|D_acl|D_v) + debug_printf("DSCP \"%s\"=%x ", dscp, dscp_value); + if (setsockopt(sock, dscp_level, dscp_option, &dscp_value, sizeof(dscp_value)) < 0) + HDEBUG(D_transport|D_acl|D_v) + debug_printf("failed to set DSCP: %s ", strerror(errno)); + /* If the kernel supports IPv4 and IPv6 on an IPv6 socket, we need to set the + option for both; ignore failures here */ + if (host_af == AF_INET6 && + dscp_lookup(dscp, AF_INET, &dscp_level, &dscp_option, &dscp_value)) + (void) setsockopt(sock, dscp_level, dscp_option, &dscp_value, sizeof(dscp_value)); + } /* Bind to a specific interface if requested. Caller must ensure the interface is the same type (IPv4 or IPv6) as the outgoing address. */ -if (interface != NULL && ip_bind(sock, host_af, interface, 0) < 0) +if (interface && ip_bind(sock, host_af, interface, 0) < 0) { save_errno = errno; HDEBUG(D_transport|D_acl|D_v) @@ -241,12 +223,88 @@ if (save_errno != 0) else { + union sockaddr_46 interface_sock; + EXIM_SOCKLEN_T size = sizeof(interface_sock); HDEBUG(D_transport|D_acl|D_v) debug_printf("connected\n"); - if (keepalive) ip_keepalive(sock, host->address, TRUE); + if (getsockname(sock, (struct sockaddr *)(&interface_sock), &size) == 0) + sending_ip_address = host_ntoa(-1, &interface_sock, NULL, &sending_port); + else + { + log_write(0, LOG_MAIN | ((errno == ECONNRESET)? 0 : LOG_PANIC), + "getsockname() failed: %s", strerror(errno)); + close(sock); + return -1; + } + if (ob->keepalive) ip_keepalive(sock, host->address, TRUE); return sock; } } +/************************************************* +* Connect to remote host * +*************************************************/ + +/* Create a socket, and connect it to a remote host. IPv6 addresses are +detected by checking for a colon in the address. AF_INET6 is defined even on +non-IPv6 systems, to enable the code to be less messy. However, on such systems +host->address will always be an IPv4 address. + +The port field in the host item is used if it is set (usually router from SRV +records or elsewhere). In other cases, the default passed as an argument is +used, and the host item is updated with its value. + +Arguments: + host host item containing name and address (and sometimes port) + host_af AF_INET or AF_INET6 + port default remote port to connect to, in host byte order, for those + hosts whose port setting is PORT_NONE + interface outgoing interface address or NULL + timeout timeout value or 0 + tb transport + +Returns: connected socket number, or -1 with errno set +*/ + +int +smtp_connect(host_item *host, int host_af, int port, uschar *interface, + int timeout, transport_instance * tb) +{ +#ifdef SUPPORT_SOCKS +smtp_transport_options_block * ob = + (smtp_transport_options_block *)tb->options_block; +#endif + +if (host->port != PORT_NONE) + { + HDEBUG(D_transport|D_acl|D_v) + debug_printf("Transport port=%d replaced by host-specific port=%d\n", port, + host->port); + port = host->port; + } +else host->port = port; /* Set the port actually used */ + +callout_address = string_sprintf("[%s]:%d", host->address, port); + +HDEBUG(D_transport|D_acl|D_v) + { + uschar * s = US" "; + if (interface) s = string_sprintf(" from %s ", interface); +#ifdef SUPPORT_SOCKS + if (ob->socks_proxy) s = string_sprintf("%svia proxy ", s); +#endif + debug_printf("Connecting to %s %s%s... ", host->name, callout_address, s); + } + +/* Create and connect the socket */ + +#ifdef SUPPORT_SOCKS +if (ob->socks_proxy) + return socks_sock_connect(host, host_af, port, interface, tb, timeout); +#endif + +return smtp_sock_connect(host, host_af, port, interface, tb, timeout); +} + /************************************************* * Flush outgoing command buffer * @@ -268,8 +326,8 @@ flush_buffer(smtp_outblock *outblock) int rc; #ifdef SUPPORT_TLS -if (tls_active == outblock->sock) - rc = tls_write(outblock->buffer, outblock->ptr - outblock->buffer); +if (tls_out.active == outblock->sock) + rc = tls_write(FALSE, outblock->buffer, outblock->ptr - outblock->buffer); else #endif @@ -299,6 +357,7 @@ Arguments: noflush if TRUE, save the command in the output buffer, for pipelining format a format, starting with one of of HELO, MAIL FROM, RCPT TO, DATA, ".", or QUIT. + If NULL, flush pipeline buffer only. ... data for the format Returns: 0 if command added to pipelining buffer, with nothing transmitted @@ -307,50 +366,57 @@ Returns: 0 if command added to pipelining buffer, with nothing transmitted */ int -smtp_write_command(smtp_outblock *outblock, BOOL noflush, char *format, ...) +smtp_write_command(smtp_outblock *outblock, BOOL noflush, const char *format, ...) { int count; int rc = 0; va_list ap; -va_start(ap, format); -if (!string_vformat(big_buffer, big_buffer_size, CS format, ap)) - log_write(0, LOG_MAIN|LOG_PANIC_DIE, "overlong write_command in outgoing " - "SMTP"); -va_end(ap); -count = Ustrlen(big_buffer); - -if (count > outblock->buffersize - (outblock->ptr - outblock->buffer)) +if (format) { - rc = outblock->cmd_count; /* flush resets */ - if (!flush_buffer(outblock)) return -1; - } + va_start(ap, format); + if (!string_vformat(big_buffer, big_buffer_size, CS format, ap)) + log_write(0, LOG_MAIN|LOG_PANIC_DIE, "overlong write_command in outgoing " + "SMTP"); + va_end(ap); + count = Ustrlen(big_buffer); + + if (count > outblock->buffersize) + log_write(0, LOG_MAIN|LOG_PANIC_DIE, "overlong write_command in outgoing " + "SMTP"); + + if (count > outblock->buffersize - (outblock->ptr - outblock->buffer)) + { + rc = outblock->cmd_count; /* flush resets */ + if (!flush_buffer(outblock)) return -1; + } -Ustrncpy(CS outblock->ptr, big_buffer, count); -outblock->ptr += count; -outblock->cmd_count++; -count -= 2; -big_buffer[count] = 0; /* remove \r\n for error message */ + Ustrncpy(CS outblock->ptr, big_buffer, count); + outblock->ptr += count; + outblock->cmd_count++; + count -= 2; + big_buffer[count] = 0; /* remove \r\n for error message */ -/* We want to hide the actual data sent in AUTH transactions from reflections -and logs. While authenticating, a flag is set in the outblock to enable this. -The AUTH command itself gets any data flattened. Other lines are flattened -completely. */ + /* We want to hide the actual data sent in AUTH transactions from reflections + and logs. While authenticating, a flag is set in the outblock to enable this. + The AUTH command itself gets any data flattened. Other lines are flattened + completely. */ -if (outblock->authenticating) - { - uschar *p = big_buffer; - if (Ustrncmp(big_buffer, "AUTH ", 5) == 0) + if (outblock->authenticating) { - p += 5; - while (isspace(*p)) p++; - while (!isspace(*p)) p++; - while (isspace(*p)) p++; + uschar *p = big_buffer; + if (Ustrncmp(big_buffer, "AUTH ", 5) == 0) + { + p += 5; + while (isspace(*p)) p++; + while (!isspace(*p)) p++; + while (isspace(*p)) p++; + } + while (*p != 0) *p++ = '*'; } - while (*p != 0) *p++ = '*'; - } -HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> %s\n", big_buffer); + HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> %s\n", big_buffer); + } if (!noflush) { @@ -533,3 +599,5 @@ return buffer[0] == okdigit; } /* End of smtp_out.c */ +/* vi: aw ai sw=2 +*/