-/* $Cambridge: exim/src/src/smtp_out.c,v 1.2 2004/11/04 12:19:48 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2004 */
+/* 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"
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
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;
-if (istring == NULL) return TRUE;
+if (!istring) return TRUE;
-expint = expand_string(istring);
-if (expint == NULL)
+if (!(expint = expand_string(istring)))
{
if (expand_string_forcedfail) return TRUE;
addr->transport_return = PANIC;
return FALSE;
}
-if (changed != NULL) *changed = expint != istring;
-
while (isspace(*expint)) expint++;
if (*expint == 0) return TRUE;
while ((iface = string_nextinlist(&expint, &sep, big_buffer,
- big_buffer_size)) != NULL)
+ big_buffer_size)))
{
if (string_is_ip_address(iface, NULL) == 0)
{
break;
}
-if (iface != NULL) *interface = string_copy(iface);
+if (iface) *interface = string_copy(iface);
return TRUE;
}
-/*************************************************
-* Connect to remote host *
-*************************************************/
+int
+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 save_errno = 0;
+BOOL fastopen = FALSE;
-/* 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.
+#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
-The port field in the host item is used if it is set (usually router from SRV
-records). In other cases, the default passed as an argument is used.
+if ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return -1;
-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
+/* Set TCP_NODELAY; Exim does its own buffering. */
-Returns: connected socket number, or -1 with errno set
-*/
+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));
-int
-smtp_connect(host_item *host, int host_af, int port, uschar *interface,
- int timeout, BOOL keepalive)
-{
-int on = 1;
-int save_errno = 0;
-int sock;
+/* 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 (host->port != PORT_NONE)
+if (dscp && dscp_lookup(dscp, host_af, &dscp_level, &dscp_option, &dscp_value))
{
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;
+ 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));
}
-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 */
-
-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));
+#ifdef TCP_FASTOPEN
+if (verify_check_given_host (&ob->hosts_try_fastopen, host) == OK) fastopen = TRUE;
+#endif
/* 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)
/* Connect to the remote host, and add keepalive to the socket before returning
it, if requested. */
-else if (ip_connect(sock, host_af, host->address, port, timeout) < 0)
+else if (ip_connect(sock, host_af, host->address, port, timeout, fastopen) < 0)
save_errno = errno;
/* Either bind() or connect() failed */
if (save_errno != 0)
{
- HDEBUG(D_transport|D_acl|D_v)
+ HDEBUG(D_transport|D_acl|D_v)
{
debug_printf("failed: %s", CUstrerror(save_errno));
- if (save_errno == ETIMEDOUT)
+ if (save_errno == ETIMEDOUT)
debug_printf(" (timeout=%s)", readconf_printtime(timeout));
- debug_printf("\n");
- }
- close(sock);
+ debug_printf("\n");
+ }
+ (void)close(sock);
errno = save_errno;
return -1;
}
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 *
flush_buffer(smtp_outblock *outblock)
{
int rc;
+int n = outblock->ptr - outblock->buffer;
+HDEBUG(D_transport|D_acl) debug_printf("cmd buf flush %d bytes\n", n);
#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, n);
else
#endif
+ rc = send(outblock->sock, outblock->buffer, n, 0);
-rc = send(outblock->sock, outblock->buffer, outblock->ptr - outblock->buffer, 0);
if (rc <= 0)
{
HDEBUG(D_transport|D_acl) debug_printf("send failed: %s\n", strerror(errno));
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
*/
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)
{
buffer where to put the response
size the size of the buffer
okdigit the expected first digit of the response
- timeout the timeout to use
+ timeout the timeout to use, in seconds
Returns: TRUE if a valid, non-error response was received; else FALSE
*/
errno = 0; /* Ensure errno starts out zero */
-/* This is a loop to read and concatentate the lines that make up a multi-line
+/* This is a loop to read and concatenate the lines that make up a multi-line
response. */
for (;;)
}
/* End of smtp_out.c */
+/* vi: aw ai sw=2
+*/
git://git.exim.org / exim.git / blobdiff