we need room to handle large base64-encoded AUTHs for GSSAPI.
*/
-#define smtp_cmd_buffer_size 16384
+#define SMTP_CMD_BUFFER_SIZE 16384
/* Size of buffer for reading SMTP incoming packets */
-#define in_buffer_size 8192
+#define IN_BUFFER_SIZE 8192
/* Structure for SMTP command list */
MAIL_CMD, RCPT_CMD, RSET_CMD,
+ /* This is a dummy to identify the non-sync commands when not pipelining */
+
+ NON_SYNC_CMD_NON_PIPELINING,
+
/* RFC3030 section 2: "After all MAIL and RCPT responses are collected and
processed the message is sent using a series of BDAT commands"
implies that BDAT should be synchronized. However, we see Google, at least,
sending MAIL,RCPT,BDAT-LAST in a single packet, clearly not waiting for
- processing of the RPCT response(s). We shall do the same, and not require
- synch for BDAT. */
+ processing of the RCPT response(s). We shall do the same, and not require
+ synch for BDAT. Worse, as the chunk may (very likely will) follow the
+ command-header in the same packet we cannot do the usual "is there any
+ follow-on data after the command line" even for non-pipeline mode.
+ So we'll need an explicit check after reading the expected chunk amount
+ when non-pipe, before sending the ACK. */
BDAT_CMD,
- /* This is a dummy to identify the non-sync commands when not pipelining */
-
- NON_SYNC_CMD_NON_PIPELINING,
-
/* I have been unable to find a statement about the use of pipelining
with AUTH, so to be on the safe side it is here, though I kind of feel
it should be up there with the synchronized commands. */
/* forward declarations */
int bdat_ungetc(int ch);
-static int smtp_read_command(BOOL check_sync);
+static int smtp_read_command(BOOL check_sync, unsigned buffer_lim);
static int synprot_error(int type, int code, uschar *data, uschar *errmess);
static void smtp_quit_handler(uschar **, uschar **);
static void smtp_rset_handler(void);
+/*************************************************
+* Recheck synchronization *
+*************************************************/
+
+/* Synchronization checks can never be perfect because a packet may be on its
+way but not arrived when the check is done. Such checks can in any case only be
+done when TLS is not in use. Normally, the checks happen when commands are
+read: Exim ensures that there is no more input in the input buffer. In normal
+cases, the response to the command will be fast, and there is no further check.
+
+However, for some commands an ACL is run, and that can include delays. In those
+cases, it is useful to do another check on the input just before sending the
+response. This also applies at the start of a connection. This function does
+that check by means of the select() function, as long as the facility is not
+disabled or inappropriate. A failure of select() is ignored.
+
+When there is unwanted input, we read it so that it appears in the log of the
+error.
+
+Arguments: none
+Returns: TRUE if all is well; FALSE if there is input pending
+*/
+
+static BOOL
+check_sync(void)
+{
+int fd, rc;
+fd_set fds;
+struct timeval tzero;
+
+if (!smtp_enforce_sync || sender_host_address == NULL ||
+ sender_host_notsocket || tls_in.active >= 0)
+ return TRUE;
+
+fd = fileno(smtp_in);
+FD_ZERO(&fds);
+FD_SET(fd, &fds);
+tzero.tv_sec = 0;
+tzero.tv_usec = 0;
+rc = select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tzero);
+
+if (rc <= 0) return TRUE; /* Not ready to read */
+rc = smtp_getc(GETC_BUFFER_UNLIMITED);
+if (rc < 0) return TRUE; /* End of file or error */
+
+smtp_ungetc(rc);
+rc = smtp_inend - smtp_inptr;
+if (rc > 150) rc = 150;
+smtp_inptr[rc] = 0;
+return FALSE;
+}
+
+
+
+/*************************************************
+* Log incomplete transactions *
+*************************************************/
+
+/* This function is called after a transaction has been aborted by RSET, QUIT,
+connection drops or other errors. It logs the envelope information received
+so far in order to preserve address verification attempts.
+
+Argument: string to indicate what aborted the transaction
+Returns: nothing
+*/
+
+static void
+incomplete_transaction_log(uschar *what)
+{
+if (sender_address == NULL || /* No transaction in progress */
+ !LOGGING(smtp_incomplete_transaction))
+ return;
+
+/* Build list of recipients for logging */
+
+if (recipients_count > 0)
+ {
+ int i;
+ raw_recipients = store_get(recipients_count * sizeof(uschar *));
+ for (i = 0; i < recipients_count; i++)
+ raw_recipients[i] = recipients_list[i].address;
+ raw_recipients_count = recipients_count;
+ }
+
+log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS,
+ "%s incomplete transaction (%s)", host_and_ident(TRUE), what);
+}
+
+
+
+
/*************************************************
* SMTP version of getc() *
*************************************************/
/* This gets the next byte from the SMTP input buffer. If the buffer is empty,
it flushes the output, and refills the buffer, with a timeout. The signal
handler is set appropriately by the calling function. This function is not used
-after a connection has negotated itself into an TLS/SSL state.
+after a connection has negotiated itself into an TLS/SSL state.
-Arguments: none
+Arguments: lim Maximum amount to read/buffer
Returns: the next character or EOF
*/
int
-smtp_getc(void)
+smtp_getc(unsigned lim)
{
if (smtp_inptr >= smtp_inend)
{
int rc, save_errno;
+ if (!smtp_out) return EOF;
fflush(smtp_out);
if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout);
- rc = read(fileno(smtp_in), smtp_inbuffer, in_buffer_size);
+
+ /* Limit amount read, so non-message data is not fed to DKIM */
+
+ rc = read(fileno(smtp_in), smtp_inbuffer, MIN(IN_BUFFER_SIZE, lim));
save_errno = errno;
alarm(0);
if (rc <= 0)
Placed here due to the correlation with the above smtp_getc(), which it wraps,
and also by the need to do smtp command/response handling.
-Arguments: none
+Arguments: lim (ignored)
Returns: the next character or ERR, EOD or EOF
*/
int
-bdat_getc(void)
+bdat_getc(unsigned lim)
{
uschar * user_msg = NULL;
uschar * log_msg;
for(;;)
{
- if (chunking_data_left-- > 0)
- return lwr_receive_getc();
+ if (chunking_data_left > 0)
+ return lwr_receive_getc(chunking_data_left--);
receive_getc = lwr_receive_getc;
receive_ungetc = lwr_receive_ungetc;
+#ifndef DISABLE_DKIM
+ dkim_collect_input = FALSE;
+#endif
+
+ /* Unless PIPELINING was offered, there should be no next command
+ until after we ack that chunk */
+
+ if (!pipelining_advertised && !check_sync())
+ {
+ incomplete_transaction_log(US"sync failure");
+ log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error "
+ "(next input sent too soon: pipelining was not advertised): "
+ "rejected \"%s\" %s next input=\"%s\"",
+ smtp_cmd_buffer, host_and_ident(TRUE),
+ string_printing(smtp_inptr));
+ (void) synprot_error(L_smtp_protocol_error, 554, NULL,
+ US"SMTP synchronization error");
+ goto repeat_until_rset;
+ }
/* If not the last, ack the received chunk. The last response is delayed
until after the data ACL decides on it */
if (chunking_state == CHUNKING_LAST)
{
#ifndef DISABLE_DKIM
- dkim_exim_verify_feed(".\r\n", 3); /* for consistency with .-term MAIL */
+ dkim_exim_verify_feed(NULL, 0); /* notify EOD */
#endif
return EOD;
}
- chunking_state = CHUNKING_OFFERED;
smtp_printf("250 %u byte chunk received\r\n", chunking_datasize);
+ chunking_state = CHUNKING_OFFERED;
+ DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state);
/* Expect another BDAT cmd from input. RFC 3030 says nothing about
QUIT, RSET or NOOP but handling them seems obvious */
next_cmd:
- switch(smtp_read_command(TRUE))
+ switch(smtp_read_command(TRUE, 1))
{
default:
(void) synprot_error(L_smtp_protocol_error, 503, NULL,
US"only BDAT permissible after non-LAST BDAT");
repeat_until_rset:
- switch(smtp_read_command(TRUE))
+ switch(smtp_read_command(TRUE, 1))
{
case QUIT_CMD: smtp_quit_handler(&user_msg, &log_msg); /*FALLTHROUGH */
case EOF_CMD: return EOF;
chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0
? CHUNKING_LAST : CHUNKING_ACTIVE;
chunking_data_left = chunking_datasize;
+ DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n",
+ (int)chunking_state, chunking_data_left);
if (chunking_datasize == 0)
if (chunking_state == CHUNKING_LAST)
receive_getc = bdat_getc;
receive_ungetc = bdat_ungetc;
+#ifndef DISABLE_DKIM
+ dkim_collect_input = TRUE;
+#endif
break; /* to top of main loop */
}
}
}
}
+static void
+bdat_flush_data(void)
+{
+while (chunking_data_left > 0)
+ if (lwr_receive_getc(chunking_data_left--) < 0)
+ break;
+
+receive_getc = lwr_receive_getc;
+receive_ungetc = lwr_receive_ungetc;
+
+if (chunking_state != CHUNKING_LAST)
+ {
+ chunking_state = CHUNKING_OFFERED;
+ DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state);
+ }
+}
+
Returns: none
*/
static void
-restore_socket_timeout(int fd, int get_ok, struct timeval tvtmp, socklen_t vslen)
+restore_socket_timeout(int fd, int get_ok, struct timeval * tvtmp, socklen_t vslen)
{
if (get_ok == 0)
- setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&tvtmp, vslen);
+ (void) setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS tvtmp, vslen);
}
/*************************************************
includes an incorrect number of spaces separating args.
Arguments: none
-Returns: int
+Returns: Boolean success
*/
static BOOL
struct sockaddr_in6 tmpaddr6;
int get_ok = 0;
-int size, ret, fd;
+int size, ret;
+int fd = fileno(smtp_in);
const char v2sig[12] = "\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A";
uschar *iptype; /* To display debug info */
struct timeval tv;
-socklen_t vslen = 0;
struct timeval tvtmp;
-
-vslen = sizeof(struct timeval);
-
-fd = fileno(smtp_in);
+socklen_t vslen = sizeof(struct timeval);
/* Save current socket timeout values */
-get_ok = getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&tvtmp,
- &vslen);
+get_ok = getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tvtmp, &vslen);
/* Proxy Protocol host must send header within a short time
(default 3 seconds) or it's considered invalid */
tv.tv_sec = PROXY_NEGOTIATION_TIMEOUT_SEC;
tv.tv_usec = PROXY_NEGOTIATION_TIMEOUT_USEC;
-setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv,
- sizeof(struct timeval));
+if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tv, sizeof(tv)) < 0)
+ return FALSE;
do
{
while (ret == -1 && errno == EINTR);
if (ret == -1)
- {
- restore_socket_timeout(fd, get_ok, tvtmp, vslen);
- return (errno == EAGAIN) ? 0 : ERRNO_PROXYFAIL;
- }
+ goto proxyfail;
-if (ret >= 16 &&
- memcmp(&hdr.v2, v2sig, 12) == 0)
+if (ret >= 16 && memcmp(&hdr.v2, v2sig, 12) == 0)
{
- uint8_t ver, cmd;
+ uint8_t ver = (hdr.v2.ver_cmd & 0xf0) >> 4;
+ uint8_t cmd = (hdr.v2.ver_cmd & 0x0f);
/* May 2014: haproxy combined the version and command into one byte to
allow two full bytes for the length field in order to proxy SSL
connections. SSL Proxy is not supported in this version of Exim, but
- must still seperate values here. */
- ver = (hdr.v2.ver_cmd & 0xf0) >> 4;
- cmd = (hdr.v2.ver_cmd & 0x0f);
+ must still separate values here. */
if (ver != 0x02)
{
}
DEBUG(D_receive) debug_printf("Detected PROXYv2 header\n");
/* The v2 header will always be 16 bytes per the spec. */
- size = 16 + hdr.v2.len;
+ size = 16 + ntohs(hdr.v2.len);
if (ret < size)
{
DEBUG(D_receive) debug_printf("Truncated or too large PROXYv2 header (%d/%d)\n",
case 0x11: /* TCPv4 address type */
iptype = US"IPv4";
tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.src_addr;
- inet_ntop(AF_INET, &(tmpaddr.sin_addr), (char *)&tmpip, sizeof(tmpip));
- if (!string_is_ip_address(US tmpip,NULL))
+ inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip));
+ if (!string_is_ip_address(US tmpip, NULL))
{
DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype);
- return ERRNO_PROXYFAIL;
+ goto proxyfail;
}
proxy_local_address = sender_host_address;
sender_host_address = string_copy(US tmpip);
sender_host_port = tmpport;
/* Save dest ip/port */
tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.dst_addr;
- inet_ntop(AF_INET, &(tmpaddr.sin_addr), (char *)&tmpip, sizeof(tmpip));
- if (!string_is_ip_address(US tmpip,NULL))
+ inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip));
+ if (!string_is_ip_address(US tmpip, NULL))
{
DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype);
- return ERRNO_PROXYFAIL;
+ goto proxyfail;
}
proxy_external_address = string_copy(US tmpip);
tmpport = ntohs(hdr.v2.addr.ip4.dst_port);
case 0x21: /* TCPv6 address type */
iptype = US"IPv6";
memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.src_addr, 16);
- inet_ntop(AF_INET6, &(tmpaddr6.sin6_addr), (char *)&tmpip6, sizeof(tmpip6));
- if (!string_is_ip_address(US tmpip6,NULL))
+ inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6));
+ if (!string_is_ip_address(US tmpip6, NULL))
{
DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype);
- return ERRNO_PROXYFAIL;
+ goto proxyfail;
}
proxy_local_address = sender_host_address;
sender_host_address = string_copy(US tmpip6);
sender_host_port = tmpport;
/* Save dest ip/port */
memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.dst_addr, 16);
- inet_ntop(AF_INET6, &(tmpaddr6.sin6_addr), (char *)&tmpip6, sizeof(tmpip6));
- if (!string_is_ip_address(US tmpip6,NULL))
+ inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6));
+ if (!string_is_ip_address(US tmpip6, NULL))
{
DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype);
- return ERRNO_PROXYFAIL;
+ goto proxyfail;
}
proxy_external_address = string_copy(US tmpip6);
tmpport = ntohs(hdr.v2.addr.ip6.dst_port);
goto proxyfail;
}
}
-else if (ret >= 8 &&
- memcmp(hdr.v1.line, "PROXY", 5) == 0)
+else if (ret >= 8 && memcmp(hdr.v1.line, "PROXY", 5) == 0)
{
uschar *p = string_copy(hdr.v1.line);
uschar *end = memchr(p, '\r', ret - 1);
size = end + 2 - hdr.v1.line; /* Skip header + CRLF */
DEBUG(D_receive) debug_printf("Detected PROXYv1 header\n");
/* Step through the string looking for the required fields. Ensure
- strict adherance to required formatting, exit for any error. */
+ strict adherence to required formatting, exit for any error. */
p += 5;
if (!isspace(*(p++)))
{
goto proxyfail;
}
*sp = '\0';
- if(!string_is_ip_address(p,NULL))
+ if(!string_is_ip_address(p, NULL))
{
DEBUG(D_receive)
debug_printf("Proxied src arg is not an %s address\n", iptype);
goto proxyfail;
}
*sp = '\0';
- if(!string_is_ip_address(p,NULL))
+ if(!string_is_ip_address(p, NULL))
{
DEBUG(D_receive)
debug_printf("Proxy dest arg is not an %s address\n", iptype);
goto proxyfail;
}
*sp = '\0';
- tmp_port = strtol(CCS p,&endc,10);
+ tmp_port = strtol(CCS p, &endc, 10);
if (*endc || tmp_port == 0)
{
DEBUG(D_receive)
DEBUG(D_receive) debug_printf("Did not find proxy dest port\n");
goto proxyfail;
}
- tmp_port = strtol(CCS p,&endc,10);
+ tmp_port = strtol(CCS p, &endc, 10);
if (*endc || tmp_port == 0)
{
DEBUG(D_receive)
}
proxyfail:
-restore_socket_timeout(fd, get_ok, tvtmp, vslen);
+restore_socket_timeout(fd, get_ok, &tvtmp, vslen);
/* Don't flush any potential buffer contents. Any input should cause a
synchronization failure */
return FALSE;
done:
-restore_socket_timeout(fd, get_ok, tvtmp, vslen);
+restore_socket_timeout(fd, get_ok, &tvtmp, vslen);
DEBUG(D_receive)
debug_printf("Valid %s sender from Proxy Protocol header\n", iptype);
return proxy_session;
return when it runs.
Arguments:
- check_sync if TRUE, check synchronization rules if global option is TRUE
+ check_sync if TRUE, check synchronization rules if global option is TRUE
+ buffer_lim maximum to buffer in lower layer
Returns: a code identifying the command (enumerated above)
*/
static int
-smtp_read_command(BOOL check_sync)
+smtp_read_command(BOOL check_sync, unsigned buffer_lim)
{
int c;
int ptr = 0;
os_non_restarting_signal(SIGALRM, command_timeout_handler);
-while ((c = (receive_getc)()) != '\n' && c != EOF)
+while ((c = (receive_getc)(buffer_lim)) != '\n' && c != EOF)
{
- if (ptr >= smtp_cmd_buffer_size)
+ if (ptr >= SMTP_CMD_BUFFER_SIZE)
{
os_non_restarting_signal(SIGALRM, sigalrm_handler);
return OTHER_CMD;
-/*************************************************
-* Recheck synchronization *
-*************************************************/
-
-/* Synchronization checks can never be perfect because a packet may be on its
-way but not arrived when the check is done. Such checks can in any case only be
-done when TLS is not in use. Normally, the checks happen when commands are
-read: Exim ensures that there is no more input in the input buffer. In normal
-cases, the response to the command will be fast, and there is no further check.
-
-However, for some commands an ACL is run, and that can include delays. In those
-cases, it is useful to do another check on the input just before sending the
-response. This also applies at the start of a connection. This function does
-that check by means of the select() function, as long as the facility is not
-disabled or inappropriate. A failure of select() is ignored.
-
-When there is unwanted input, we read it so that it appears in the log of the
-error.
-
-Arguments: none
-Returns: TRUE if all is well; FALSE if there is input pending
-*/
-
-static BOOL
-check_sync(void)
-{
-int fd, rc;
-fd_set fds;
-struct timeval tzero;
-
-if (!smtp_enforce_sync || sender_host_address == NULL ||
- sender_host_notsocket || tls_in.active >= 0)
- return TRUE;
-
-fd = fileno(smtp_in);
-FD_ZERO(&fds);
-FD_SET(fd, &fds);
-tzero.tv_sec = 0;
-tzero.tv_usec = 0;
-rc = select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tzero);
-
-if (rc <= 0) return TRUE; /* Not ready to read */
-rc = smtp_getc();
-if (rc < 0) return TRUE; /* End of file or error */
-
-smtp_ungetc(rc);
-rc = smtp_inend - smtp_inptr;
-if (rc > 150) rc = 150;
-smtp_inptr[rc] = 0;
-return FALSE;
-}
-
-
-
/*************************************************
* Forced closedown of call *
*************************************************/
receive_swallow_smtp();
smtp_printf("421 %s\r\n", message);
-for (;;)
+for (;;) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
{
- switch(smtp_read_command(FALSE))
- {
- case EOF_CMD:
- return;
+ case EOF_CMD:
+ return;
- case QUIT_CMD:
- smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
- mac_smtp_fflush();
- return;
+ case QUIT_CMD:
+ smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
+ mac_smtp_fflush();
+ return;
- case RSET_CMD:
- smtp_printf("250 Reset OK\r\n");
- break;
+ case RSET_CMD:
+ smtp_printf("250 Reset OK\r\n");
+ break;
- default:
- smtp_printf("421 %s\r\n", message);
- break;
- }
+ default:
+ smtp_printf("421 %s\r\n", message);
+ break;
}
}
uschar *
smtp_get_connection_info(void)
{
-uschar *hostname = (sender_fullhost == NULL)?
- sender_host_address : sender_fullhost;
+const uschar * hostname = sender_fullhost
+ ? sender_fullhost : sender_host_address;
if (host_checking)
return string_sprintf("SMTP connection from %s", hostname);
/* Check the format of a HELO line. The data for HELO/EHLO is supposed to be
the domain name of the sending host, or an ip literal in square brackets. The
-arrgument is placed in sender_helo_name, which is in malloc store, because it
+argument is placed in sender_helo_name, which is in malloc store, because it
must persist over multiple incoming messages. If helo_accept_junk is set, this
host is permitted to send any old junk (needed for some broken hosts).
Otherwise, helo_allow_chars can be used for rogue characters in general
uschar *v = smtp_cmd_data + Ustrlen(smtp_cmd_data) - 1;
while (isspace(*v)) v--;
v[1] = 0;
-while (v > smtp_cmd_data && *v != '=' && !isspace(*v)) v--;
+while (v > smtp_cmd_data && *v != '=' && !isspace(*v))
+ {
+ /* Take care to not stop at a space embedded in a quoted local-part */
+
+ if (*v == '"') do v--; while (*v != '"' && v > smtp_cmd_data+1);
+ v--;
+ }
n = v;
if (*v == '=')
uschar *recipient = NULL;
int start, end, sender_domain, recipient_domain;
- switch(smtp_read_command(FALSE))
+ switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
{
/* The HELO/EHLO commands set sender_address_helo if they have
valid data; otherwise they are ignored, except that they do
/* Allow for trailing 0 in the command and data buffers. */
-smtp_cmd_buffer = (uschar *)malloc(2*smtp_cmd_buffer_size + 2);
-if (smtp_cmd_buffer == NULL)
+if (!(smtp_cmd_buffer = US malloc(2*SMTP_CMD_BUFFER_SIZE + 2)))
log_write(0, LOG_MAIN|LOG_PANIC_DIE,
"malloc() failed for SMTP command buffer");
+
smtp_cmd_buffer[0] = 0;
-smtp_data_buffer = smtp_cmd_buffer + smtp_cmd_buffer_size + 1;
+smtp_data_buffer = smtp_cmd_buffer + SMTP_CMD_BUFFER_SIZE + 1;
/* For batched input, the protocol setting can be overridden from the
command line by a trusted caller. */
if (smtp_batched_input)
{
- if (received_protocol == NULL) received_protocol = US"local-bsmtp";
+ if (!received_protocol) received_protocol = US"local-bsmtp";
}
/* For non-batched SMTP input, the protocol setting is forced here. It will be
/* Set up the buffer for inputting using direct read() calls, and arrange to
call the local functions instead of the standard C ones. */
-smtp_inbuffer = (uschar *)malloc(in_buffer_size);
-if (smtp_inbuffer == NULL)
+if (!(smtp_inbuffer = (uschar *)malloc(IN_BUFFER_SIZE)))
log_write(0, LOG_MAIN|LOG_PANIC_DIE, "malloc() failed for SMTP input buffer");
+
receive_getc = smtp_getc;
receive_get_cache = smtp_get_cache;
receive_ungetc = smtp_ungetc;
proxy_session = FALSE;
proxy_session_failed = FALSE;
if (check_proxy_protocol_host())
- {
- if (setup_proxy_protocol_host() == FALSE)
+ if (!setup_proxy_protocol_host())
{
proxy_session_failed = TRUE;
DEBUG(D_receive)
(void)host_name_lookup();
host_build_sender_fullhost();
}
- }
#endif
/* Run the ACL if it exists */
user_msg = NULL;
-if (acl_smtp_connect != NULL)
+if (acl_smtp_connect)
{
int rc;
- rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg,
- &log_msg);
- if (rc != OK)
+ if ((rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg,
+ &log_msg)) != OK)
{
- (void)smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg);
+ (void) smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg);
return FALSE;
}
}
-/*************************************************
-* Log incomplete transactions *
-*************************************************/
-
-/* This function is called after a transaction has been aborted by RSET, QUIT,
-connection drops or other errors. It logs the envelope information received
-so far in order to preserve address verification attempts.
-
-Argument: string to indicate what aborted the transaction
-Returns: nothing
-*/
-
-static void
-incomplete_transaction_log(uschar *what)
-{
-if (sender_address == NULL || /* No transaction in progress */
- !LOGGING(smtp_incomplete_transaction))
- return;
-
-/* Build list of recipients for logging */
-
-if (recipients_count > 0)
- {
- int i;
- raw_recipients = store_get(recipients_count * sizeof(uschar *));
- for (i = 0; i < recipients_count; i++)
- raw_recipients[i] = recipients_list[i].address;
- raw_recipients_count = recipients_count;
- }
-
-log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS,
- "%s incomplete transaction (%s)", host_and_ident(TRUE), what);
-}
-
-
-
-
/*************************************************
* Send SMTP response, possibly multiline *
*************************************************/
uschar *sender_info = US"";
uschar *what =
#ifdef WITH_CONTENT_SCAN
- (where == ACL_WHERE_MIME)? US"during MIME ACL checks" :
+ where == ACL_WHERE_MIME ? US"during MIME ACL checks" :
#endif
- (where == ACL_WHERE_PREDATA)? US"DATA" :
- (where == ACL_WHERE_DATA)? US"after DATA" :
+ where == ACL_WHERE_PREDATA ? US"DATA" :
+ where == ACL_WHERE_DATA ? US"after DATA" :
#ifndef DISABLE_PRDR
- (where == ACL_WHERE_PRDR)? US"after DATA PRDR" :
+ where == ACL_WHERE_PRDR ? US"after DATA PRDR" :
#endif
- (smtp_cmd_data == NULL)?
- string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]) :
- string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_data);
+ smtp_cmd_data ?
+ string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_data) :
+ string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]);
if (drop) rc = FAIL;
failures, but not defers. However, always log it for defer, and log it for fail
unless the sender_verify_fail log selector has been turned off. */
-if (sender_verified_failed != NULL &&
+if (sender_verified_failed &&
!testflag(sender_verified_failed, af_sverify_told))
{
BOOL save_rcpt_in_progress = rcpt_in_progress;
(sender_verified_failed->message == NULL)? US"" :
string_sprintf(": %s", sender_verified_failed->message));
- if (rc == FAIL && sender_verified_failed->user_message != NULL)
+ if (rc == FAIL && sender_verified_failed->user_message)
smtp_respond(smtp_code, codelen, FALSE, string_sprintf(
testflag(sender_verified_failed, af_verify_pmfail)?
"Postmaster verification failed while checking <%s>\n%s\n"
/* Sort out text for logging */
-log_msg = (log_msg == NULL)? US"" : string_sprintf(": %s", log_msg);
-lognl = Ustrchr(log_msg, '\n');
-if (lognl != NULL) *lognl = 0;
+log_msg = log_msg ? string_sprintf(": %s", log_msg) : US"";
+if ((lognl = Ustrchr(log_msg, '\n'))) *lognl = 0;
/* Send permanent failure response to the command, but the code used isn't
always a 5xx one - see comments at the start of this function. If the original
rc was FAIL_DROP we drop the connection and yield 2. */
-if (rc == FAIL) smtp_respond(smtp_code, codelen, TRUE, (user_msg == NULL)?
- US"Administrative prohibition" : user_msg);
+if (rc == FAIL)
+ smtp_respond(smtp_code, codelen, TRUE,
+ user_msg ? user_msg : US"Administrative prohibition");
/* Send temporary failure response to the command. Don't give any details,
unless acl_temp_details is set. This is TRUE for a callout defer, a "defer"
be re-implemented in a tidier fashion. */
else
- {
- if (acl_temp_details && user_msg != NULL)
+ if (acl_temp_details && user_msg)
{
- if (smtp_return_error_details &&
- sender_verified_failed != NULL &&
- sender_verified_failed->message != NULL)
- {
+ if ( smtp_return_error_details
+ && sender_verified_failed
+ && sender_verified_failed->message
+ )
smtp_respond(smtp_code, codelen, FALSE, sender_verified_failed->message);
- }
+
smtp_respond(smtp_code, codelen, TRUE, user_msg);
}
else
smtp_respond(smtp_code, codelen, TRUE,
US"Temporary local problem - please try later");
- }
/* Log the incident to the logs that are specified by log_reject_target
(default main, reject). This can be empty to suppress logging of rejections. If
#else
uschar * tls = US"";
#endif
- log_write(0, log_reject_target, "%s%s%s %s%srejected %s%s",
+ log_write(where == ACL_WHERE_CONNECT ? L_connection_reject : 0,
+ log_reject_target, "%s%s%s %s%srejected %s%s",
LOGGING(dnssec) && sender_host_dnssec ? US" DS" : US"",
host_and_ident(TRUE),
tls,
passed to this function.
In case things go wrong while processing this function, causing an error that
-may re-enter this funtion, there is a recursion check.
+may re-enter this function, there is a recursion check.
Arguments:
reason What $smtp_notquit_reason will be set to in the ACL;
/* Call the not-QUIT ACL, if there is one, unless no reason is given. */
-if (acl_smtp_notquit != NULL && reason != NULL)
+if (acl_smtp_notquit && reason)
{
smtp_notquit_reason = reason;
- rc = acl_check(ACL_WHERE_NOTQUIT, NULL, acl_smtp_notquit, &user_msg,
- &log_msg);
- if (rc == ERROR)
+ if ((rc = acl_check(ACL_WHERE_NOTQUIT, NULL, acl_smtp_notquit, &user_msg,
+ &log_msg)) == ERROR)
log_write(0, LOG_MAIN|LOG_PANIC, "ACL for not-QUIT returned ERROR: %s",
log_msg);
}
warning, just in case. Note that string_vformat() still leaves a complete
string, even if it is incomplete. */
-if (code != NULL && defaultrespond != NULL)
+if (code && defaultrespond)
{
- if (user_msg == NULL)
+ if (user_msg)
+ smtp_respond(code, 3, TRUE, user_msg);
+ else
{
uschar buffer[128];
va_list ap;
smtp_printf("%s %s\r\n", code, buffer);
va_end(ap);
}
- else
- smtp_respond(code, 3, TRUE, user_msg);
mac_smtp_fflush();
}
}
{
HAD(SCH_QUIT);
incomplete_transaction_log(US"QUIT");
-if (acl_smtp_quit != NULL)
+if (acl_smtp_quit)
{
int rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, user_msgp, log_msgp);
if (rc == ERROR)
uschar *orcpt = NULL;
int flags;
-#if defined(SUPPORT_TLS) && defined(AUTH_TLS)
+#ifdef AUTH_TLS
/* Check once per STARTTLS or SSL-on-connect for a TLS AUTH */
if ( tls_in.active >= 0
&& tls_in.peercert
}
#endif
- switch(smtp_read_command(TRUE))
+#ifdef TCP_QUICKACK
+ if (smtp_in) /* Avoid pure-ACKs while in cmd pingpong phase */
+ (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK,
+ US &off, sizeof(off));
+#endif
+
+ switch(smtp_read_command(TRUE, GETC_BUFFER_UNLIMITED))
{
/* The AUTH command is not permitted to occur inside a transaction, and may
occur successfully only once per connection. Actually, that isn't quite
dsn_advertised = TRUE;
}
- /* Advertise ETRN if there's an ACL checking whether a host is
- permitted to issue it; a check is made when any host actually tries. */
+ /* Advertise ETRN/VRFY/EXPN if there's are ACL checking whether a host is
+ permitted to issue them; a check is made when any host actually tries. */
- if (acl_smtp_etrn != NULL)
+ if (acl_smtp_etrn)
{
s = string_catn(s, &size, &ptr, smtp_code, 3);
s = string_catn(s, &size, &ptr, US"-ETRN\r\n", 7);
}
-
- /* Advertise EXPN if there's an ACL checking whether a host is
- permitted to issue it; a check is made when any host actually tries. */
-
- if (acl_smtp_expn != NULL)
+ if (acl_smtp_vrfy)
+ {
+ s = string_catn(s, &size, &ptr, smtp_code, 3);
+ s = string_catn(s, &size, &ptr, US"-VRFY\r\n", 7);
+ }
+ if (acl_smtp_expn)
{
s = string_catn(s, &size, &ptr, smtp_code, 3);
s = string_catn(s, &size, &ptr, US"-EXPN\r\n", 7);
them in either case in the AUTH command. */
if ( auths
-#if defined(SUPPORT_TLS) && defined(AUTH_TLS)
+#ifdef AUTH_TLS
&& !sender_host_authenticated
#endif
&& verify_check_host(&auth_advertise_hosts) == OK
friends now makes it absolutely clear that it means *mailbox*. Consequently
we must always qualify this address, regardless. */
- if (recipient_domain == 0)
+ if (!recipient_domain)
if (!(recipient_domain = qualify_recipient(&recipient, smtp_cmd_data,
US"recipient")))
{
there may be a delay in this, re-check for a synchronization error
afterwards, unless pipelining was advertised. */
- if (recipients_discarded) rc = DISCARD; else
- {
- rc = acl_check(ACL_WHERE_RCPT, recipient, acl_smtp_rcpt, &user_msg,
- &log_msg);
- if (rc == OK && !pipelining_advertised && !check_sync())
+ if (recipients_discarded)
+ rc = DISCARD;
+ else
+ if ( (rc = acl_check(ACL_WHERE_RCPT, recipient, acl_smtp_rcpt, &user_msg,
+ &log_msg)) == OK
+ && !pipelining_advertised && !check_sync())
goto SYNC_FAILURE;
- }
/* The ACL was happy */
if (rc == OK)
{
- if (user_msg == NULL) smtp_printf("250 Accepted\r\n");
- else smtp_user_msg(US"250", user_msg);
+ if (user_msg)
+ smtp_user_msg(US"250", user_msg);
+ else
+ smtp_printf("250 Accepted\r\n");
receive_add_recipient(recipient, -1);
/* Set the dsn flags in the recipients_list */
else if (rc == DISCARD)
{
- if (user_msg == NULL) smtp_printf("250 Accepted\r\n");
- else smtp_user_msg(US"250", user_msg);
+ if (user_msg)
+ smtp_user_msg(US"250", user_msg);
+ else
+ smtp_printf("250 Accepted\r\n");
rcpt_fail_count++;
discarded = TRUE;
log_write(0, LOG_MAIN|LOG_REJECT, "%s F=<%s> RCPT %s: "
chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0
? CHUNKING_LAST : CHUNKING_ACTIVE;
chunking_data_left = chunking_datasize;
+ DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n",
+ (int)chunking_state, chunking_data_left);
lwr_receive_getc = receive_getc;
lwr_receive_ungetc = receive_ungetc;
receive_getc = bdat_getc;
receive_ungetc = bdat_ungetc;
- DEBUG(D_any)
- debug_printf("chunking state %d\n", (int)chunking_state);
goto DATA_BDAT;
}
smtp_connection_had[smtp_ch_index-1] == SCH_DATA
? US"valid RCPT command must precede DATA"
: US"valid RCPT command must precede BDAT");
+
+ if (chunking_state > CHUNKING_OFFERED)
+ bdat_flush_data();
break;
}
}
if (chunking_state > CHUNKING_OFFERED)
- { /* No predata ACL or go-ahead output for BDAT */
- rc = OK;
- }
+ rc = OK; /* No predata ACL or go-ahead output for BDAT */
else
{
/* If there is an ACL, re-check the synchronization afterwards, since the
"354 Enter message, ending with \".\" on a line by itself\r\n");
}
+#ifdef TCP_QUICKACK
+ if (smtp_in) /* all ACKs needed to ramp window up for bulk data */
+ (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK,
+ US &on, sizeof(on));
+#endif
done = 3;
message_ended = END_NOTENDED; /* Indicate in middle of data */
break;
}
- if (recipient_domain == 0)
+ if (!recipient_domain)
if (!(recipient_domain = qualify_recipient(&address, smtp_cmd_data,
US"verify")))
break;
/* RFC 2487 is not clear on when this command may be sent, though it
does state that all information previously obtained from the client
- must be discarded if a TLS session is started. It seems reasonble to
+ must be discarded if a TLS session is started. It seems reasonable to
do an implied RSET when STARTTLS is received. */
incomplete_transaction_log(US"STARTTLS");
/* and if TLS is already active, tls_server_start() should fail */
}
- /* There is nothing we value in the input buffer and if TLS is succesfully
+ /* There is nothing we value in the input buffer and if TLS is successfully
negotiated, we won't use this buffer again; if TLS fails, we'll just read
fresh content into it. The buffer contains arbitrary content from an
untrusted remote source; eg: NOOP <shellcode>\r\nSTARTTLS\r\n
It seems safest to just wipe away the content rather than leave it as a
target to jump to. */
- memset(smtp_inbuffer, 0, in_buffer_size);
+ memset(smtp_inbuffer, 0, IN_BUFFER_SIZE);
/* Attempt to start up a TLS session, and if successful, discard all
knowledge that was obtained previously. At least, that's what the RFC says,
set, but we must still reject all incoming commands. */
DEBUG(D_tls) debug_printf("TLS failed to start\n");
- while (done <= 0)
+ while (done <= 0) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED))
{
- switch(smtp_read_command(FALSE))
- {
- case EOF_CMD:
- log_write(L_smtp_connection, LOG_MAIN, "%s closed by EOF",
- smtp_get_connection_info());
- smtp_notquit_exit(US"tls-failed", NULL, NULL);
- done = 2;
- break;
-
- /* It is perhaps arguable as to which exit ACL should be called here,
- but as it is probably a situation that almost never arises, it
- probably doesn't matter. We choose to call the real QUIT ACL, which in
- some sense is perhaps "right". */
+ case EOF_CMD:
+ log_write(L_smtp_connection, LOG_MAIN, "%s closed by EOF",
+ smtp_get_connection_info());
+ smtp_notquit_exit(US"tls-failed", NULL, NULL);
+ done = 2;
+ break;
- case QUIT_CMD:
- user_msg = NULL;
- if (acl_smtp_quit != NULL)
- {
- rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, &user_msg,
- &log_msg);
- if (rc == ERROR)
- log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s",
- log_msg);
- }
- if (user_msg == NULL)
- smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
- else
- smtp_respond(US"221", 3, TRUE, user_msg);
- log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT",
- smtp_get_connection_info());
- done = 2;
- break;
+ /* It is perhaps arguable as to which exit ACL should be called here,
+ but as it is probably a situation that almost never arises, it
+ probably doesn't matter. We choose to call the real QUIT ACL, which in
+ some sense is perhaps "right". */
+
+ case QUIT_CMD:
+ user_msg = NULL;
+ if ( acl_smtp_quit
+ && ((rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, &user_msg,
+ &log_msg)) == ERROR))
+ log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s",
+ log_msg);
+ if (user_msg)
+ smtp_respond(US"221", 3, TRUE, user_msg);
+ else
+ smtp_printf("221 %s closing connection\r\n", smtp_active_hostname);
+ log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT",
+ smtp_get_connection_info());
+ done = 2;
+ break;
- default:
- smtp_printf("554 Security failure\r\n");
- break;
- }
+ default:
+ smtp_printf("554 Security failure\r\n");
+ break;
}
tls_close(TRUE, TRUE);
break;
case BADSYN_CMD:
SYNC_FAILURE:
- if (smtp_inend >= smtp_inbuffer + in_buffer_size)
- smtp_inend = smtp_inbuffer + in_buffer_size - 1;
+ if (smtp_inend >= smtp_inbuffer + IN_BUFFER_SIZE)
+ smtp_inend = smtp_inbuffer + IN_BUFFER_SIZE - 1;
c = smtp_inend - smtp_inptr;
if (c > 150) c = 150;
smtp_inptr[c] = 0;
git://git.exim.org / exim.git / blobdiff