-/* $Id$ */
+/*
+ * $Id$
+ *
+ * An implementation of RFC821 (Simple Mail Transfer Protocol) for the
+ * Citadel system.
+ *
+ */
#include "sysdep.h"
#include <stdlib.h>
#include <pwd.h>
#include <errno.h>
#include <sys/types.h>
-#include <sys/time.h>
+
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+# include <sys/time.h>
+# else
+# include <time.h>
+# endif
+#endif
+
#include <sys/wait.h>
+#include <ctype.h>
#include <string.h>
#include <limits.h>
#include "citadel.h"
#include "server.h"
-#include <time.h>
#include "sysdep_decls.h"
#include "citserver.h"
#include "support.h"
#include "config.h"
+#include "control.h"
#include "dynloader.h"
#include "room_ops.h"
#include "user_ops.h"
#include "tools.h"
#include "internet_addressing.h"
#include "genstamp.h"
+#include "domain.h"
+#include "clientsocket.h"
+
+#ifndef HAVE_SNPRINTF
+#include "snprintf.h"
+#endif
struct citsmtp { /* Information about the current session */
int command_state;
+ char helo_node[SIZ];
struct usersupp vrfy_buffer;
int vrfy_count;
- char vrfy_match[256];
- char from[256];
- char recipient[256];
+ char vrfy_match[SIZ];
+ char from[SIZ];
+ char recipients[SIZ];
int number_of_recipients;
+ int number_of_rooms;
int delivery_mode;
+ int message_originated_locally;
};
enum { /* Command states for login authentication */
smtp_deliver_remote
};
-#define SMTP ((struct citsmtp *)CtdlGetUserData(SYM_SMTP))
+#define SMTP ((struct citsmtp *)CtdlGetUserData(SYM_SMTP))
+#define SMTP_RECPS ((char *)CtdlGetUserData(SYM_SMTP_RECPS))
+#define SMTP_ROOMS ((char *)CtdlGetUserData(SYM_SMTP_ROOMS))
long SYM_SMTP;
+long SYM_SMTP_RECPS;
+long SYM_SMTP_ROOMS;
+
+int run_queue_now = 0; /* Set to 1 to ignore SMTP send retry times */
+
+
+
+/*****************************************************************************/
+/* SMTP SERVER (INBOUND) STUFF */
+/*****************************************************************************/
+
+
/*
CC->internal_pgm = 1;
CC->cs_flags |= CS_STEALTH;
CtdlAllocUserData(SYM_SMTP, sizeof(struct citsmtp));
+ CtdlAllocUserData(SYM_SMTP_RECPS, SIZ);
+ CtdlAllocUserData(SYM_SMTP_ROOMS, SIZ);
+ snprintf(SMTP_RECPS, SIZ, "%s", "");
+ snprintf(SMTP_ROOMS, SIZ, "%s", "");
- cprintf("220 Welcome to the Citadel/UX ESMTP server at %s\n",
- config.c_fqdn);
+ cprintf("220 %s ESMTP Citadel/UX server ready.\r\n", config.c_fqdn);
}
*/
void smtp_hello(char *argbuf, int is_esmtp) {
+ safestrncpy(SMTP->helo_node, argbuf, sizeof SMTP->helo_node);
+
if (!is_esmtp) {
- cprintf("250 Greetings and joyous salutations.\n");
+ cprintf("250 Greetings and joyous salutations.\r\n");
}
else {
- cprintf("250-Greetings and joyous salutations.\n");
- cprintf("250-HELP\n");
- cprintf("250-SIZE %ld\n", config.c_maxmsglen);
- cprintf("250 AUTH=LOGIN\n");
+ cprintf("250-Greetings and joyous salutations.\r\n");
+ cprintf("250-HELP\r\n");
+ cprintf("250-SIZE %ld\r\n", config.c_maxmsglen);
+ cprintf("250-PIPELINING\r\n");
+ cprintf("250 AUTH=LOGIN\r\n");
}
}
* Implement HELP command.
*/
void smtp_help(void) {
- cprintf("214-Here's the frequency, Kenneth:\n");
- cprintf("214- DATA\n");
- cprintf("214- EHLO\n");
- cprintf("214- EXPN\n");
- cprintf("214- HELO\n");
- cprintf("214- HELP\n");
- cprintf("214- MAIL\n");
- cprintf("214- NOOP\n");
- cprintf("214- QUIT\n");
- cprintf("214- RCPT\n");
- cprintf("214- RSET\n");
- cprintf("214- VRFY\n");
- cprintf("214 I could tell you more, but then I'd have to kill you.\n");
+ cprintf("214-Commands accepted:\r\n");
+ cprintf("214- DATA\r\n");
+ cprintf("214- EHLO\r\n");
+ cprintf("214- EXPN\r\n");
+ cprintf("214- HELO\r\n");
+ cprintf("214- HELP\r\n");
+ cprintf("214- MAIL\r\n");
+ cprintf("214- NOOP\r\n");
+ cprintf("214- QUIT\r\n");
+ cprintf("214- RCPT\r\n");
+ cprintf("214- RSET\r\n");
+ cprintf("214- VRFY\r\n");
+ cprintf("214 \r\n");
}
*
*/
void smtp_get_user(char *argbuf) {
- char buf[256];
- char username[256];
+ char buf[SIZ];
+ char username[SIZ];
- decode_base64(username, argbuf);
+ decode_base64(username, argbuf, SIZ);
lprintf(9, "Trying <%s>\n", username);
if (CtdlLoginExistingUser(username) == login_ok) {
encode_base64(buf, "Password:");
- cprintf("334 %s\n", buf);
+ cprintf("334 %s\r\n", buf);
SMTP->command_state = smtp_password;
}
else {
- cprintf("500 No such user.\n");
+ cprintf("500 No such user.\r\n");
SMTP->command_state = smtp_command;
}
}
*
*/
void smtp_get_pass(char *argbuf) {
- char password[256];
+ char password[SIZ];
- decode_base64(password, argbuf);
+ decode_base64(password, argbuf, SIZ);
lprintf(9, "Trying <%s>\n", password);
if (CtdlTryPassword(password) == pass_ok) {
- cprintf("235 Authentication successful.\n");
- lprintf(9, "SMTP auth login successful\n");
+ cprintf("235 Hello, %s\r\n", CC->usersupp.fullname);
+ lprintf(9, "SMTP authenticated login successful\n");
CC->internal_pgm = 0;
CC->cs_flags &= ~CS_STEALTH;
}
else {
- cprintf("500 Authentication failed.\n");
+ cprintf("500 Authentication failed.\r\n");
}
SMTP->command_state = smtp_command;
}
*
*/
void smtp_auth(char *argbuf) {
- char buf[256];
+ char buf[SIZ];
if (strncasecmp(argbuf, "login", 5) ) {
- cprintf("550 We only support LOGIN authentication.\n");
+ cprintf("550 We only support LOGIN authentication.\r\n");
return;
}
else {
encode_base64(buf, "Username:");
- cprintf("334 %s\n", buf);
+ cprintf("334 %s\r\n", buf);
SMTP->command_state = smtp_user;
}
}
/*
* Back end for smtp_vrfy() command
*/
-void smtp_vrfy_backend(struct usersupp *us) {
+void smtp_vrfy_backend(struct usersupp *us, void *data) {
if (!fuzzy_match(us, SMTP->vrfy_match)) {
++SMTP->vrfy_count;
void smtp_vrfy(char *argbuf) {
SMTP->vrfy_count = 0;
strcpy(SMTP->vrfy_match, argbuf);
- ForEachUser(smtp_vrfy_backend);
+ ForEachUser(smtp_vrfy_backend, NULL);
if (SMTP->vrfy_count < 1) {
- cprintf("550 String does not match anything.\n");
+ cprintf("550 String does not match anything.\r\n");
}
else if (SMTP->vrfy_count == 1) {
- cprintf("250 %s <cit%ld@%s>\n",
+ cprintf("250 %s <cit%ld@%s>\r\n",
SMTP->vrfy_buffer.fullname,
SMTP->vrfy_buffer.usernum,
config.c_fqdn);
}
else if (SMTP->vrfy_count > 1) {
- cprintf("553 Request ambiguous: %d users matched.\n",
+ cprintf("553 Request ambiguous: %d users matched.\r\n",
SMTP->vrfy_count);
}
/*
* Back end for smtp_expn() command
*/
-void smtp_expn_backend(struct usersupp *us) {
+void smtp_expn_backend(struct usersupp *us, void *data) {
if (!fuzzy_match(us, SMTP->vrfy_match)) {
if (SMTP->vrfy_count >= 1) {
- cprintf("250-%s <cit%ld@%s>\n",
+ cprintf("250-%s <cit%ld@%s>\r\n",
SMTP->vrfy_buffer.fullname,
SMTP->vrfy_buffer.usernum,
config.c_fqdn);
void smtp_expn(char *argbuf) {
SMTP->vrfy_count = 0;
strcpy(SMTP->vrfy_match, argbuf);
- ForEachUser(smtp_expn_backend);
+ ForEachUser(smtp_expn_backend, NULL);
if (SMTP->vrfy_count < 1) {
- cprintf("550 String does not match anything.\n");
+ cprintf("550 String does not match anything.\r\n");
}
else if (SMTP->vrfy_count >= 1) {
- cprintf("250 %s <cit%ld@%s>\n",
+ cprintf("250 %s <cit%ld@%s>\r\n",
SMTP->vrfy_buffer.fullname,
SMTP->vrfy_buffer.usernum,
config.c_fqdn);
*/
void smtp_rset(void) {
memset(SMTP, 0, sizeof(struct citsmtp));
- if (CC->logged_in) logout(CC);
- cprintf("250 Zap!\n");
+ if (CC->logged_in) {
+ logout(CC);
+ }
+ cprintf("250 Zap!\r\n");
+}
+
+/*
+ * Clear out the portions of the state buffer that need to be cleared out
+ * after the DATA command finishes.
+ */
+void smtp_data_clear(void) {
+ strcpy(SMTP->from, "");
+ strcpy(SMTP->recipients, "");
+ SMTP->number_of_recipients = 0;
+ SMTP->delivery_mode = 0;
+ SMTP->message_originated_locally = 0;
}
* Implements the "MAIL From:" command
*/
void smtp_mail(char *argbuf) {
- char user[256];
- char node[256];
- int cvt;
+ char user[SIZ];
+ char node[SIZ];
+ char name[SIZ];
+ struct recptypes *valid;
if (strlen(SMTP->from) != 0) {
- cprintf("503 Only one sender permitted\n");
+ cprintf("503 Only one sender permitted\r\n");
return;
}
if (strncasecmp(argbuf, "From:", 5)) {
- cprintf("501 Syntax error\n");
+ cprintf("501 Syntax error\r\n");
return;
}
strcpy(SMTP->from, &argbuf[5]);
striplt(SMTP->from);
+ stripallbut(SMTP->from, '<', '>');
if (strlen(SMTP->from) == 0) {
- cprintf("501 Empty sender name is not permitted\n");
+ cprintf("501 Empty sender name is not permitted\r\n");
return;
}
-
/* If this SMTP connection is from a logged-in user, make sure that
* the user only sends email from his/her own address.
*/
if (CC->logged_in) {
- cvt = convert_internet_address(user, node, SMTP->from);
- lprintf(9, "cvt=%d, citaddr=<%s@%s>\n", cvt, user, node);
- if ( (cvt != 0) || (strcasecmp(user, CC->usersupp.fullname))) {
- cprintf("550 <%s> is not your address.\n", SMTP->from);
+ valid = validate_recipients(SMTP->from);
+ if ( (valid->num_local == 1) &&
+ (!strcasecmp(valid->recp_local, CC->usersupp.fullname)) ) {
+ cprintf("250 Sender ok <%s>\r\n", valid->recp_local);
+ SMTP->message_originated_locally = 1;
+ }
+ else {
+ cprintf("550 <%s> is not your address.\r\n",
+ SMTP->from);
strcpy(SMTP->from, "");
- return;
}
+ phree(valid);
+ return;
}
+
/* Otherwise, make sure outsiders aren't trying to forge mail from
* this system.
*/
else {
- cvt = convert_internet_address(user, node, SMTP->from);
- lprintf(9, "cvt=%d, citaddr=<%s@%s>\n", cvt, user, node);
- if (!strcasecmp(node, config.c_nodename)) { /* FIX use fcn */
- cprintf("550 You must log in to send mail from %s\n",
- config.c_fqdn);
+ process_rfc822_addr(SMTP->from, user, node, name);
+ if (CtdlHostAlias(node) != hostalias_nomatch) {
+ cprintf("550 You must log in to send mail from %s\r\n",
+ node);
strcpy(SMTP->from, "");
return;
}
}
- cprintf("250 Sender ok. Groovy.\n");
+ cprintf("250 Sender ok\r\n");
}
* Implements the "RCPT To:" command
*/
void smtp_rcpt(char *argbuf) {
- int cvt;
- char user[256];
- char node[256];
+ char recp[SIZ];
+ struct recptypes *valid;
if (strlen(SMTP->from) == 0) {
- cprintf("503 MAIL first, then RCPT. Duh.\n");
+ cprintf("503 Need MAIL before RCPT\r\n");
return;
}
- if (SMTP->number_of_recipients > 0) {
- cprintf("552 Only one recipient allowed (FIX)\n");
+ if (strncasecmp(argbuf, "To:", 3)) {
+ cprintf("501 Syntax error\r\n");
return;
}
- if (strncasecmp(argbuf, "To:", 3)) {
- cprintf("501 Syntax error\n");
+ strcpy(recp, &argbuf[3]);
+ striplt(recp);
+ stripallbut(recp, '<', '>');
+
+ if ( (strlen(recp) + strlen(SMTP->recipients) + 1 ) >= SIZ) {
+ cprintf("452 Too many recipients\r\n");
return;
}
- strcpy(SMTP->recipient, &argbuf[3]);
- striplt(SMTP->recipient);
- alias(SMTP->recipient);
+ valid = validate_recipients(recp);
+ if (valid->num_error > 0) {
+ cprintf("599 Error: %s\r\n", valid->errormsg);
+ phree(valid);
+ return;
+ }
- cvt = convert_internet_address(user, node, SMTP->recipient);
- switch(cvt) {
- case rfc822_address_locally_validated:
- cprintf("250 %s is a valid recipient.\n", user);
- ++SMTP->number_of_recipients;
- return;
- case rfc822_no_such_user:
- cprintf("550 %s: no such user\n", SMTP->recipient);
- strcpy(SMTP->recipient, "");
+ if (valid->num_internet > 0) {
+ if (SMTP->message_originated_locally == 0) {
+ cprintf("551 Relaying denied <%s>\r\n", recp);
+ phree(valid);
return;
+ }
}
- strcpy(SMTP->recipient, "");
- cprintf("599 Unknown error (FIX)\n");
-}
-
-
-
-
-
-/*
- * Back end for smtp_data() ... this does the actual delivery of the message
- * Returns 0 on success, nonzero on failure
- */
-int smtp_message_delivery(struct CtdlMessage *msg) {
- char user[256];
- char node[256];
- char name[256];
- int successful_saves = 0;
- int failed_saves = 0;
- long msgid = (-1L);
- int cvt;
-
- lprintf(9, "smtp_message_delivery() called\n");
-
- /* Fill in 'from' fields with envelope information if missing */
- process_rfc822_addr(SMTP->from, user, node, name);
- if (msg->cm_fields['A']==NULL) msg->cm_fields['A'] = strdoop(user);
- if (msg->cm_fields['N']==NULL) msg->cm_fields['N'] = strdoop(node);
- if (msg->cm_fields['H']==NULL) msg->cm_fields['H'] = strdoop(name);
-
- /* Stuff the boxes */
- /* FIX modify to handle multiple recipients */
- cvt = convert_internet_address(user, node, SMTP->recipient);
- switch(cvt) {
- case rfc822_address_locally_validated:
- lprintf(9, "Delivering to %s\n", user);
-
- if (msgid < 0L) {
- CtdlSaveMsg(msg,
- user,
- "",
- MES_LOCAL,
- 1);
- }
- else {
- /* FIX copy the msgid to another room */
- }
-
- ++successful_saves;
- break;
-
- case rfc822_no_such_user:
- ++failed_saves;
- break;
+ cprintf("250 RCPT ok <%s>\r\n", recp);
+ if (strlen(SMTP->recipients) > 0) {
+ strcat(SMTP->recipients, ",");
}
-
- return(failed_saves);
+ strcat(SMTP->recipients, recp);
+ SMTP->number_of_recipients += 1;
}
+
/*
* Implements the DATA command
*/
void smtp_data(void) {
char *body;
struct CtdlMessage *msg;
- int retval;
- char nowstamp[256];
+ long msgnum;
+ char nowstamp[SIZ];
+ struct recptypes *valid;
+ int scan_errors;
if (strlen(SMTP->from) == 0) {
- cprintf("503 Need MAIL command first.\n");
+ cprintf("503 Need MAIL command first.\r\n");
return;
}
if (SMTP->number_of_recipients < 1) {
- cprintf("503 Need RCPT command first.\n");
+ cprintf("503 Need RCPT command first.\r\n");
return;
}
- cprintf("354 Transmit message now; terminate with '.' by itself\n");
+ cprintf("354 Transmit message now; terminate with '.' by itself\r\n");
- generate_rfc822_datestamp(nowstamp, time(NULL));
+ datestring(nowstamp, sizeof nowstamp, time(NULL), DATESTRING_RFC822);
body = mallok(4096);
- if (body != NULL) sprintf(body,
- "Received: from %s\n"
- " by %s;\n"
- " %s\n",
- "FIX.FIX.com",
+
+ /* FIXME
+ it should be Received: from %s (real.name.dom [w.x.y.z])
+ */
+ if (body != NULL) snprintf(body, 4096,
+ "Received: from %s (%s)\n"
+ " by %s; %s\n",
+ SMTP->helo_node,
+ CC->cs_host,
config.c_fqdn,
nowstamp);
body = CtdlReadMessageBody(".", config.c_maxmsglen, body);
if (body == NULL) {
- cprintf("550 Unable to save message text: internal error.\n");
+ cprintf("550 Unable to save message: internal error.\r\n");
return;
}
msg = convert_internet_message(body);
/* If the user is locally authenticated, FORCE the From: header to
- * show up as the real sender
+ * show up as the real sender. Yes, this violates the RFC standard,
+ * but IT MAKES SENSE. Comment it out if you don't like this behavior.
*/
if (CC->logged_in) {
if (msg->cm_fields['A'] != NULL) phree(msg->cm_fields['A']);
msg->cm_fields['H'] = strdoop(config.c_humannode);
}
- retval = smtp_message_delivery(msg);
- CtdlFreeMessage(msg);
+ /* Submit the message into the Citadel system. */
+ valid = validate_recipients(SMTP->recipients);
- if (!retval) {
- cprintf("250 Message accepted for delivery.\n");
+ /* If there are modules that want to scan this message before final
+ * submission (such as virus checkers or spam filters), call them now
+ * and give them an opportunity to reject the message.
+ */
+ scan_errors = PerformMessageHooks(msg, EVT_SMTPSCAN);
+
+ if (scan_errors > 0) { /* We don't want this message! */
+
+ if (msg->cm_fields['0'] == NULL) {
+ msg->cm_fields['0'] = strdoop(
+ "Message rejected by filter");
+ }
+
+ cprintf("552 %s\r\n", msg->cm_fields['0']);
}
- else {
- cprintf("550 Internal error.\n");
+
+ else { /* Ok, we'll accept this message. */
+ msgnum = CtdlSubmitMsg(msg, valid, "");
+ if (msgnum > 0L) {
+ cprintf("250 Message accepted.\r\n");
+ }
+ else {
+ cprintf("550 Internal delivery error\r\n");
+ }
}
+
+ CtdlFreeMessage(msg);
+ phree(valid);
+ smtp_data_clear(); /* clear out the buffers now */
}
* Main command loop for SMTP sessions.
*/
void smtp_command_loop(void) {
- char cmdbuf[256];
+ char cmdbuf[SIZ];
time(&CC->lastcmd);
memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
CC->kill_me = 1;
return;
}
- lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
+ lprintf(5, "SMTP: %s\n", cmdbuf);
while (strlen(cmdbuf) < 5) strcat(cmdbuf, " ");
if (SMTP->command_state == smtp_user) {
}
else if (!strncasecmp(cmdbuf, "NOOP", 4)) {
- cprintf("250 This command successfully did nothing.\n");
+ cprintf("250 NOOP\r\n");
}
else if (!strncasecmp(cmdbuf, "QUIT", 4)) {
- cprintf("221 Goodbye...\n");
+ cprintf("221 Goodbye...\r\n");
CC->kill_me = 1;
return;
- }
+ }
else if (!strncasecmp(cmdbuf, "RCPT", 4)) {
smtp_rcpt(&cmdbuf[5]);
}
else {
- cprintf("502 I'm afraid I can't do that, Dave.\n");
+ cprintf("502 I'm afraid I can't do that.\r\n");
}
}
+
+
+/*****************************************************************************/
+/* SMTP CLIENT (OUTBOUND PROCESSING) STUFF */
+/*****************************************************************************/
+
+
+
+/*
+ * smtp_try()
+ *
+ * Called by smtp_do_procmsg() to attempt delivery to one SMTP host
+ *
+ */
+void smtp_try(const char *key, const char *addr, int *status,
+ char *dsn, size_t n, long msgnum)
+{
+ int sock = (-1);
+ char mxhosts[1024];
+ int num_mxhosts;
+ int mx;
+ int i;
+ char user[SIZ], node[SIZ], name[SIZ];
+ char buf[1024];
+ char mailfrom[1024];
+ int lp, rp;
+ FILE *msg_fp = NULL;
+ size_t msg_size;
+ size_t blocksize = 0;
+ int scan_done;
+
+ /* Parse out the host portion of the recipient address */
+ process_rfc822_addr(addr, user, node, name);
+
+ lprintf(9, "Attempting SMTP delivery to <%s> @ <%s> (%s)\n",
+ user, node, name);
+
+ /* Load the message out of the database into a temp file */
+ msg_fp = tmpfile();
+ if (msg_fp == NULL) {
+ *status = 4;
+ snprintf(dsn, n, "Error creating temporary file");
+ return;
+ }
+ else {
+ CtdlRedirectOutput(msg_fp, -1);
+ CtdlOutputMsg(msgnum, MT_RFC822, 0, 0, 1);
+ CtdlRedirectOutput(NULL, -1);
+ fseek(msg_fp, 0L, SEEK_END);
+ msg_size = ftell(msg_fp);
+ }
+
+
+ /* Extract something to send later in the 'MAIL From:' command */
+ strcpy(mailfrom, "");
+ rewind(msg_fp);
+ scan_done = 0;
+ do {
+ if (fgets(buf, sizeof buf, msg_fp)==NULL) scan_done = 1;
+ if (!strncasecmp(buf, "From:", 5)) {
+ safestrncpy(mailfrom, &buf[5], sizeof mailfrom);
+ striplt(mailfrom);
+ for (i=0; i<strlen(mailfrom); ++i) {
+ if (!isprint(mailfrom[i])) {
+ strcpy(&mailfrom[i], &mailfrom[i+1]);
+ i=0;
+ }
+ }
+
+ /* Strip out parenthesized names */
+ lp = (-1);
+ rp = (-1);
+ for (i=0; i<strlen(mailfrom); ++i) {
+ if (mailfrom[i] == '(') lp = i;
+ if (mailfrom[i] == ')') rp = i;
+ }
+ if ((lp>0)&&(rp>lp)) {
+ strcpy(&mailfrom[lp-1], &mailfrom[rp+1]);
+ }
+
+ /* Prefer brokketized names */
+ lp = (-1);
+ rp = (-1);
+ for (i=0; i<strlen(mailfrom); ++i) {
+ if (mailfrom[i] == '<') lp = i;
+ if (mailfrom[i] == '>') rp = i;
+ }
+ if ( (lp>=0) && (rp>lp) ) {
+ mailfrom[rp] = 0;
+ strcpy(mailfrom, &mailfrom[lp]);
+ }
+
+ scan_done = 1;
+ }
+ } while (scan_done == 0);
+ if (strlen(mailfrom)==0) strcpy(mailfrom, "someone@somewhere.org");
+
+ /* Figure out what mail exchanger host we have to connect to */
+ num_mxhosts = getmx(mxhosts, node);
+ lprintf(9, "Number of MX hosts for <%s> is %d\n", node, num_mxhosts);
+ if (num_mxhosts < 1) {
+ *status = 5;
+ snprintf(dsn, SIZ, "No MX hosts found for <%s>", node);
+ return;
+ }
+
+ for (mx=0; mx<num_mxhosts; ++mx) {
+ extract(buf, mxhosts, mx);
+ lprintf(9, "Trying <%s>\n", buf);
+ sock = sock_connect(buf, "25", "tcp");
+ snprintf(dsn, SIZ, "Could not connect: %s", strerror(errno));
+ if (sock >= 0) lprintf(9, "Connected!\n");
+ if (sock < 0) snprintf(dsn, SIZ, "%s", strerror(errno));
+ if (sock >= 0) break;
+ }
+
+ if (sock < 0) {
+ *status = 4; /* dsn is already filled in */
+ return;
+ }
+
+ /* Process the SMTP greeting from the server */
+ if (ml_sock_gets(sock, buf) < 0) {
+ *status = 4;
+ strcpy(dsn, "Connection broken during SMTP conversation");
+ goto bail;
+ }
+ lprintf(9, "<%s\n", buf);
+ if (buf[0] != '2') {
+ if (buf[0] == '4') {
+ *status = 4;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ else {
+ *status = 5;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ }
+
+ /* At this point we know we are talking to a real SMTP server */
+
+ /* Do a HELO command */
+ snprintf(buf, sizeof buf, "HELO %s\r\n", config.c_fqdn);
+ lprintf(9, ">%s", buf);
+ sock_write(sock, buf, strlen(buf));
+ if (ml_sock_gets(sock, buf) < 0) {
+ *status = 4;
+ strcpy(dsn, "Connection broken during SMTP HELO");
+ goto bail;
+ }
+ lprintf(9, "<%s\n", buf);
+ if (buf[0] != '2') {
+ if (buf[0] == '4') {
+ *status = 4;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ else {
+ *status = 5;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ }
+
+
+ /* HELO succeeded, now try the MAIL From: command */
+ snprintf(buf, sizeof buf, "MAIL From: <%s>\r\n", mailfrom);
+ lprintf(9, ">%s", buf);
+ sock_write(sock, buf, strlen(buf));
+ if (ml_sock_gets(sock, buf) < 0) {
+ *status = 4;
+ strcpy(dsn, "Connection broken during SMTP MAIL");
+ goto bail;
+ }
+ lprintf(9, "<%s\n", buf);
+ if (buf[0] != '2') {
+ if (buf[0] == '4') {
+ *status = 4;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ else {
+ *status = 5;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ }
+
+
+ /* MAIL succeeded, now try the RCPT To: command */
+ snprintf(buf, sizeof buf, "RCPT To: <%s>\r\n", addr);
+ lprintf(9, ">%s", buf);
+ sock_write(sock, buf, strlen(buf));
+ if (ml_sock_gets(sock, buf) < 0) {
+ *status = 4;
+ strcpy(dsn, "Connection broken during SMTP RCPT");
+ goto bail;
+ }
+ lprintf(9, "<%s\n", buf);
+ if (buf[0] != '2') {
+ if (buf[0] == '4') {
+ *status = 4;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ else {
+ *status = 5;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ }
+
+
+ /* RCPT succeeded, now try the DATA command */
+ lprintf(9, ">DATA\n");
+ sock_write(sock, "DATA\r\n", 6);
+ if (ml_sock_gets(sock, buf) < 0) {
+ *status = 4;
+ strcpy(dsn, "Connection broken during SMTP DATA");
+ goto bail;
+ }
+ lprintf(9, "<%s\n", buf);
+ if (buf[0] != '3') {
+ if (buf[0] == '4') {
+ *status = 3;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ else {
+ *status = 5;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ }
+
+ /* If we reach this point, the server is expecting data */
+ rewind(msg_fp);
+ while (msg_size > 0) {
+ blocksize = sizeof(buf);
+ if (blocksize > msg_size) blocksize = msg_size;
+ fread(buf, blocksize, 1, msg_fp);
+ sock_write(sock, buf, blocksize);
+ msg_size -= blocksize;
+ }
+ if (buf[blocksize-1] != 10) {
+ lprintf(5, "Possible problem: message did not correctly "
+ "terminate. (expecting 0x10, got 0x%02x)\n",
+ buf[blocksize-1]);
+ }
+
+ sock_write(sock, ".\r\n", 3);
+ if (ml_sock_gets(sock, buf) < 0) {
+ *status = 4;
+ strcpy(dsn, "Connection broken during SMTP message transmit");
+ goto bail;
+ }
+ lprintf(9, "%s\n", buf);
+ if (buf[0] != '2') {
+ if (buf[0] == '4') {
+ *status = 4;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ else {
+ *status = 5;
+ safestrncpy(dsn, &buf[4], 1023);
+ goto bail;
+ }
+ }
+
+ /* We did it! */
+ safestrncpy(dsn, &buf[4], 1023);
+ *status = 2;
+
+ lprintf(9, ">QUIT\n");
+ sock_write(sock, "QUIT\r\n", 6);
+ ml_sock_gets(sock, buf);
+ lprintf(9, "<%s\n", buf);
+
+bail: if (msg_fp != NULL) fclose(msg_fp);
+ sock_close(sock);
+ return;
+}
+
+
+
+/*
+ * smtp_do_bounce() is caled by smtp_do_procmsg() to scan a set of delivery
+ * instructions for "5" codes (permanent fatal errors) and produce/deliver
+ * a "bounce" message (delivery status notification).
+ */
+void smtp_do_bounce(char *instr) {
+ int i;
+ int lines;
+ int status;
+ char buf[1024];
+ char key[1024];
+ char addr[1024];
+ char dsn[1024];
+ char bounceto[1024];
+ int num_bounces = 0;
+ int bounce_this = 0;
+ long bounce_msgid = (-1);
+ time_t submitted = 0L;
+ struct CtdlMessage *bmsg = NULL;
+ int give_up = 0;
+ struct recptypes *valid;
+ int successful_bounce = 0;
+
+ lprintf(9, "smtp_do_bounce() called\n");
+ strcpy(bounceto, "");
+
+ lines = num_tokens(instr, '\n');
+
+
+ /* See if it's time to give up on delivery of this message */
+ for (i=0; i<lines; ++i) {
+ extract_token(buf, instr, i, '\n');
+ extract(key, buf, 0);
+ extract(addr, buf, 1);
+ if (!strcasecmp(key, "submitted")) {
+ submitted = atol(addr);
+ }
+ }
+
+ if ( (time(NULL) - submitted) > SMTP_GIVE_UP ) {
+ give_up = 1;
+ }
+
+
+
+ bmsg = (struct CtdlMessage *) mallok(sizeof(struct CtdlMessage));
+ if (bmsg == NULL) return;
+ memset(bmsg, 0, sizeof(struct CtdlMessage));
+
+ bmsg->cm_magic = CTDLMESSAGE_MAGIC;
+ bmsg->cm_anon_type = MES_NORMAL;
+ bmsg->cm_format_type = 1;
+ bmsg->cm_fields['A'] = strdoop("Citadel");
+ bmsg->cm_fields['O'] = strdoop(MAILROOM);
+ bmsg->cm_fields['N'] = strdoop(config.c_nodename);
+
+ if (give_up) bmsg->cm_fields['M'] = strdoop(
+"A message you sent could not be delivered to some or all of its recipients\n"
+"due to prolonged unavailability of its destination(s).\n"
+"Giving up on the following addresses:\n\n"
+);
+
+ else bmsg->cm_fields['M'] = strdoop(
+"A message you sent could not be delivered to some or all of its recipients.\n"
+"The following addresses were undeliverable:\n\n"
+);
+
+ /*
+ * Now go through the instructions checking for stuff.
+ */
+
+ for (i=0; i<lines; ++i) {
+ extract_token(buf, instr, i, '\n');
+ extract(key, buf, 0);
+ extract(addr, buf, 1);
+ status = extract_int(buf, 2);
+ extract(dsn, buf, 3);
+ bounce_this = 0;
+
+ lprintf(9, "key=<%s> addr=<%s> status=%d dsn=<%s>\n",
+ key, addr, status, dsn);
+
+ if (!strcasecmp(key, "bounceto")) {
+ strcpy(bounceto, addr);
+ }
+
+ if (
+ (!strcasecmp(key, "local"))
+ || (!strcasecmp(key, "remote"))
+ || (!strcasecmp(key, "ignet"))
+ || (!strcasecmp(key, "room"))
+ ) {
+ if (status == 5) bounce_this = 1;
+ if (give_up) bounce_this = 1;
+ }
+
+ if (bounce_this) {
+ ++num_bounces;
+
+ if (bmsg->cm_fields['M'] == NULL) {
+ lprintf(2, "ERROR ... M field is null "
+ "(%s:%d)\n", __FILE__, __LINE__);
+ }
+
+ bmsg->cm_fields['M'] = reallok(bmsg->cm_fields['M'],
+ strlen(bmsg->cm_fields['M']) + 1024 );
+ strcat(bmsg->cm_fields['M'], addr);
+ strcat(bmsg->cm_fields['M'], ": ");
+ strcat(bmsg->cm_fields['M'], dsn);
+ strcat(bmsg->cm_fields['M'], "\n");
+
+ remove_token(instr, i, '\n');
+ --i;
+ --lines;
+ }
+ }
+
+ /* Deliver the bounce if there's anything worth mentioning */
+ lprintf(9, "num_bounces = %d\n", num_bounces);
+ if (num_bounces > 0) {
+
+ /* First try the user who sent the message */
+ lprintf(9, "bounce to user? <%s>\n", bounceto);
+ if (strlen(bounceto) == 0) {
+ lprintf(7, "No bounce address specified\n");
+ bounce_msgid = (-1L);
+ }
+
+ /* Can we deliver the bounce to the original sender? */
+ valid = validate_recipients(bounceto);
+ if (valid != NULL) {
+ if (valid->num_error == 0) {
+ CtdlSubmitMsg(bmsg, valid, "");
+ successful_bounce = 1;
+ }
+ }
+
+ /* If not, post it in the Aide> room */
+ if (successful_bounce == 0) {
+ CtdlSubmitMsg(bmsg, NULL, AIDEROOM);
+ }
+
+ /* Free up the memory we used */
+ if (valid != NULL) {
+ phree(valid);
+ }
+ }
+
+ CtdlFreeMessage(bmsg);
+ lprintf(9, "Done processing bounces\n");
+}
+
+
+/*
+ * smtp_purge_completed_deliveries() is caled by smtp_do_procmsg() to scan a
+ * set of delivery instructions for completed deliveries and remove them.
+ *
+ * It returns the number of incomplete deliveries remaining.
+ */
+int smtp_purge_completed_deliveries(char *instr) {
+ int i;
+ int lines;
+ int status;
+ char buf[1024];
+ char key[1024];
+ char addr[1024];
+ char dsn[1024];
+ int completed;
+ int incomplete = 0;
+
+ lines = num_tokens(instr, '\n');
+ for (i=0; i<lines; ++i) {
+ extract_token(buf, instr, i, '\n');
+ extract(key, buf, 0);
+ extract(addr, buf, 1);
+ status = extract_int(buf, 2);
+ extract(dsn, buf, 3);
+
+ completed = 0;
+
+ if (
+ (!strcasecmp(key, "local"))
+ || (!strcasecmp(key, "remote"))
+ || (!strcasecmp(key, "ignet"))
+ || (!strcasecmp(key, "room"))
+ ) {
+ if (status == 2) completed = 1;
+ else ++incomplete;
+ }
+
+ if (completed) {
+ remove_token(instr, i, '\n');
+ --i;
+ --lines;
+ }
+ }
+
+ return(incomplete);
+}
+
+
+/*
+ * smtp_do_procmsg()
+ *
+ * Called by smtp_do_queue() to handle an individual message.
+ */
+void smtp_do_procmsg(long msgnum, void *userdata) {
+ struct CtdlMessage *msg;
+ char *instr = NULL;
+ char *results = NULL;
+ int i;
+ int lines;
+ int status;
+ char buf[1024];
+ char key[1024];
+ char addr[1024];
+ char dsn[1024];
+ long text_msgid = (-1);
+ int incomplete_deliveries_remaining;
+ time_t attempted = 0L;
+ time_t last_attempted = 0L;
+ time_t retry = SMTP_RETRY_INTERVAL;
+
+ lprintf(9, "smtp_do_procmsg(%ld)\n", msgnum);
+
+ msg = CtdlFetchMessage(msgnum);
+ if (msg == NULL) {
+ lprintf(3, "SMTP: tried %ld but no such message!\n", msgnum);
+ return;
+ }
+
+ instr = strdoop(msg->cm_fields['M']);
+ CtdlFreeMessage(msg);
+
+ /* Strip out the headers amd any other non-instruction line */
+ lines = num_tokens(instr, '\n');
+ for (i=0; i<lines; ++i) {
+ extract_token(buf, instr, i, '\n');
+ if (num_tokens(buf, '|') < 2) {
+ remove_token(instr, i, '\n');
+ --lines;
+ --i;
+ }
+ }
+
+ /* Learn the message ID and find out about recent delivery attempts */
+ lines = num_tokens(instr, '\n');
+ for (i=0; i<lines; ++i) {
+ extract_token(buf, instr, i, '\n');
+ extract(key, buf, 0);
+ if (!strcasecmp(key, "msgid")) {
+ text_msgid = extract_long(buf, 1);
+ }
+ if (!strcasecmp(key, "retry")) {
+ /* double the retry interval after each attempt */
+ retry = extract_long(buf, 1) * 2L;
+ if (retry > SMTP_RETRY_MAX) {
+ retry = SMTP_RETRY_MAX;
+ }
+ remove_token(instr, i, '\n');
+ }
+ if (!strcasecmp(key, "attempted")) {
+ attempted = extract_long(buf, 1);
+ if (attempted > last_attempted)
+ last_attempted = attempted;
+ }
+ }
+
+ /*
+ * Postpone delivery if we've already tried recently.
+ */
+ if (((time(NULL) - last_attempted) < retry) && (run_queue_now == 0)) {
+ lprintf(7, "Retry time not yet reached.\n");
+ phree(instr);
+ return;
+ }
+
+
+ /*
+ * Bail out if there's no actual message associated with this
+ */
+ if (text_msgid < 0L) {
+ lprintf(3, "SMTP: no 'msgid' directive found!\n");
+ phree(instr);
+ return;
+ }
+
+ /* Plow through the instructions looking for 'remote' directives and
+ * a status of 0 (no delivery yet attempted) or 3/4 (transient errors
+ * were experienced and it's time to try again)
+ */
+ lines = num_tokens(instr, '\n');
+ for (i=0; i<lines; ++i) {
+ extract_token(buf, instr, i, '\n');
+ extract(key, buf, 0);
+ extract(addr, buf, 1);
+ status = extract_int(buf, 2);
+ extract(dsn, buf, 3);
+ if ( (!strcasecmp(key, "remote"))
+ && ((status==0)||(status==3)||(status==4)) ) {
+ remove_token(instr, i, '\n');
+ --i;
+ --lines;
+ lprintf(9, "SMTP: Trying <%s>\n", addr);
+ smtp_try(key, addr, &status, dsn, sizeof dsn, text_msgid);
+ if (status != 2) {
+ if (results == NULL) {
+ results = mallok(1024);
+ memset(results, 0, 1024);
+ }
+ else {
+ results = reallok(results,
+ strlen(results) + 1024);
+ }
+ snprintf(&results[strlen(results)], 1024,
+ "%s|%s|%d|%s\n",
+ key, addr, status, dsn);
+ }
+ }
+ }
+
+ if (results != NULL) {
+ instr = reallok(instr, strlen(instr) + strlen(results) + 2);
+ strcat(instr, results);
+ phree(results);
+ }
+
+
+ /* Generate 'bounce' messages */
+ smtp_do_bounce(instr);
+
+ /* Go through the delivery list, deleting completed deliveries */
+ incomplete_deliveries_remaining =
+ smtp_purge_completed_deliveries(instr);
+
+
+ /*
+ * No delivery instructions remain, so delete both the instructions
+ * message and the message message.
+ */
+ if (incomplete_deliveries_remaining <= 0) {
+ CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, msgnum, "");
+ CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, text_msgid, "");
+ }
+
+
+ /*
+ * Uncompleted delivery instructions remain, so delete the old
+ * instructions and replace with the updated ones.
+ */
+ if (incomplete_deliveries_remaining > 0) {
+ CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, msgnum, "");
+ msg = mallok(sizeof(struct CtdlMessage));
+ memset(msg, 0, sizeof(struct CtdlMessage));
+ msg->cm_magic = CTDLMESSAGE_MAGIC;
+ msg->cm_anon_type = MES_NORMAL;
+ msg->cm_format_type = FMT_RFC822;
+ msg->cm_fields['M'] = malloc(strlen(instr)+SIZ);
+ snprintf(msg->cm_fields['M'],
+ strlen(instr)+SIZ,
+ "Content-type: %s\n\n%s\n"
+ "attempted|%ld\n"
+ "retry|%ld\n",
+ SPOOLMIME, instr, (long)time(NULL), (long)retry );
+ phree(instr);
+ CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
+ CtdlFreeMessage(msg);
+ }
+
+}
+
+
+
+/*
+ * smtp_do_queue()
+ *
+ * Run through the queue sending out messages.
+ */
+void smtp_do_queue(void) {
+ static int doing_queue = 0;
+
+ /*
+ * This is a simple concurrency check to make sure only one queue run
+ * is done at a time. We could do this with a mutex, but since we
+ * don't really require extremely fine granularity here, we'll do it
+ * with a static variable instead.
+ */
+ if (doing_queue) return;
+ doing_queue = 1;
+
+ /*
+ * Go ahead and run the queue
+ */
+ lprintf(7, "SMTP: processing outbound queue\n");
+
+ if (getroom(&CC->quickroom, SMTP_SPOOLOUT_ROOM) != 0) {
+ lprintf(3, "Cannot find room <%s>\n", SMTP_SPOOLOUT_ROOM);
+ return;
+ }
+ CtdlForEachMessage(MSGS_ALL, 0L,
+ SPOOLMIME, NULL, smtp_do_procmsg, NULL);
+
+ lprintf(7, "SMTP: queue run completed\n");
+ run_queue_now = 0;
+ doing_queue = 0;
+}
+
+
+
+/*****************************************************************************/
+/* SMTP UTILITY COMMANDS */
+/*****************************************************************************/
+
+void cmd_smtp(char *argbuf) {
+ char cmd[SIZ];
+ char node[SIZ];
+ char buf[SIZ];
+ int i;
+ int num_mxhosts;
+
+ if (CtdlAccessCheck(ac_aide)) return;
+
+ extract(cmd, argbuf, 0);
+
+ if (!strcasecmp(cmd, "mx")) {
+ extract(node, argbuf, 1);
+ num_mxhosts = getmx(buf, node);
+ cprintf("%d %d MX hosts listed for %s\n",
+ LISTING_FOLLOWS, num_mxhosts, node);
+ for (i=0; i<num_mxhosts; ++i) {
+ extract(node, buf, i);
+ cprintf("%s\n", node);
+ }
+ cprintf("000\n");
+ return;
+ }
+
+ else if (!strcasecmp(cmd, "runqueue")) {
+ run_queue_now = 1;
+ cprintf("%d All outbound SMTP will be retried now.\n", CIT_OK);
+ return;
+ }
+
+ else {
+ cprintf("%d Invalid command.\n", ERROR+ILLEGAL_VALUE);
+ }
+
+}
+
+
+
+
+/*****************************************************************************/
+/* MODULE INITIALIZATION STUFF */
+/*****************************************************************************/
+
+
char *Dynamic_Module_Init(void)
{
SYM_SMTP = CtdlGetDynamicSymbol();
- CtdlRegisterServiceHook(SMTP_PORT,
+
+ CtdlRegisterServiceHook(config.c_smtp_port, /* On the net... */
+ NULL,
+ smtp_greeting,
+ smtp_command_loop);
+
+ CtdlRegisterServiceHook(0, /* ...and locally */
+ "smtp.socket",
smtp_greeting,
smtp_command_loop);
- create_room(SMTP_SPOOLOUT_ROOM, 3, "", 0);
+
+ create_room(SMTP_SPOOLOUT_ROOM, 3, "", 0, 1, 0);
+ CtdlRegisterSessionHook(smtp_do_queue, EVT_TIMER);
+ CtdlRegisterProtoHook(cmd_smtp, "SMTP", "SMTP utility commands");
return "$Id$";
}
-
projects / citadel.git / blobdiff