citadel/server/modules/smtp/serv_smtpclient.c

   1 // Transmit outbound SMTP mail to the big wide world of the Internet
   2 //
   3 // This is the new, exciting, clever version that makes libcurl do all the work  :)
   4 //
   5 // Copyright (c) 1997-2023 by the citadel.org team
   6 //
   7 // This program is open source software.  Use, duplication, or disclosure
   8 // is subject to the terms of the GNU General Public License, version 3.
   9
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12 #include <stdio.h>
  13 #include <time.h>
  14 #include <ctype.h>
  15 #include <string.h>
  16 #include <errno.h>
  17 #include <sys/types.h>
  18 #include <sys/stat.h>
  19 #include <libcitadel.h>
  20 #include <curl/curl.h>
  21 #include "../../sysconfig.h"
  22 #include "../../citadel.h"
  23 #include "../../server.h"
  24 #include "../../citserver.h"
  25 #include "../../support.h"
  26 #include "../../config.h"
  27 #include "../../ctdl_module.h"
  28 #include "../../clientsocket.h"
  29 #include "../../msgbase.h"
  30 #include "../../domain.h"
  31 #include "../../internet_addressing.h"
  32 #include "../../citadel_dirs.h"
  33 #include "../smtp/smtp_util.h"
  34
  35 struct smtpmsgsrc {             // Data passed in and out of libcurl for message upload
  36         StrBuf *TheMessage;
  37         int bytes_total;
  38         int bytes_sent;
  39 };
  40
  41 // Initialize the SMTP outbound queue
  42 void smtp_init_spoolout(void) {
  43         struct ctdlroom qrbuf;
  44
  45         // Create the room.  This will silently fail if the room already
  46         // exists, and that's perfectly ok, because we want it to exist.
  47         CtdlCreateRoom(SMTP_SPOOLOUT_ROOM, 3, "", 0, 1, 0, VIEW_QUEUE);
  48
  49         // Make sure it's set to be a "system room" so it doesn't show up
  50         // in the <K>nown rooms list for administrators.
  51         if (CtdlGetRoomLock(&qrbuf, SMTP_SPOOLOUT_ROOM) == 0) {
  52                 qrbuf.QRflags2 |= QR2_SYSTEM;
  53                 CtdlPutRoomLock(&qrbuf);
  54         }
  55 }
  56
  57
  58 // For internet mail, generate delivery instructions.
  59 // Yes, this is recursive.  Deal with it.  Infinite recursion does
  60 // not happen because the delivery instructions message does not
  61 // contain a recipient.
  62 int smtp_aftersave(struct CtdlMessage *msg, struct recptypes *recps) {
  63         if ((recps != NULL) && (recps->num_internet > 0)) {
  64                 struct CtdlMessage *imsg = NULL;
  65                 char recipient[SIZ];
  66                 StrBuf *SpoolMsg = NewStrBuf();
  67                 long nTokens;
  68                 int i;
  69
  70                 syslog(LOG_DEBUG, "smtpclient: generating delivery instructions");
  71
  72                 StrBufPrintf(SpoolMsg,
  73                              "Content-type: " SPOOLMIME "\n"
  74                              "\n"
  75                              "msgid|%s\n"
  76                              "submitted|%ld\n" "bounceto|%s\n", msg->cm_fields[eVltMsgNum], (long) time(NULL), recps->bounce_to);
  77
  78                 if (recps->envelope_from != NULL) {
  79                         StrBufAppendBufPlain(SpoolMsg, HKEY("envelope_from|"), 0);
  80                         StrBufAppendBufPlain(SpoolMsg, recps->envelope_from, -1, 0);
  81                         StrBufAppendBufPlain(SpoolMsg, HKEY("\n"), 0);
  82                 }
  83                 if (recps->sending_room != NULL) {
  84                         StrBufAppendBufPlain(SpoolMsg, HKEY("source_room|"), 0);
  85                         StrBufAppendBufPlain(SpoolMsg, recps->sending_room, -1, 0);
  86                         StrBufAppendBufPlain(SpoolMsg, HKEY("\n"), 0);
  87                 }
  88
  89                 nTokens = num_tokens(recps->recp_internet, '|');
  90                 for (i = 0; i < nTokens; i++) {
  91                         long len;
  92                         len = extract_token(recipient, recps->recp_internet, i, '|', sizeof recipient);
  93                         if (len > 0) {
  94                                 StrBufAppendBufPlain(SpoolMsg, HKEY("remote|"), 0);
  95                                 StrBufAppendBufPlain(SpoolMsg, recipient, len, 0);
  96                                 StrBufAppendBufPlain(SpoolMsg, HKEY("|0||\n"), 0);
  97                         }
  98                 }
  99
 100                 imsg = malloc(sizeof(struct CtdlMessage));
 101                 memset(imsg, 0, sizeof(struct CtdlMessage));
 102                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 103                 imsg->cm_anon_type = MES_NORMAL;
 104                 imsg->cm_format_type = FMT_RFC822;
 105                 CM_SetField(imsg, eMsgSubject, HKEY("QMSG"));
 106                 CM_SetField(imsg, eAuthor, HKEY("Citadel"));
 107                 CM_SetField(imsg, eJournal, HKEY("do not journal"));
 108                 CM_SetAsFieldSB(imsg, eMesageText, &SpoolMsg);
 109                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 110                 CM_Free(imsg);
 111         }
 112         return 0;
 113 }
 114
 115
 116 // Callback for smtp_attempt_delivery() to supply libcurl with upload data.
 117 static size_t upload_source(void *ptr, size_t size, size_t nmemb, void *userp) {
 118         struct smtpmsgsrc *s = (struct smtpmsgsrc *) userp;
 119         int sendbytes = 0;
 120         const char *send_this = NULL;
 121
 122         sendbytes = (size * nmemb);
 123
 124         if (s->bytes_sent >= s->bytes_total) {
 125                 return (0);                                     // no data remaining; we are done
 126         }
 127
 128         if (sendbytes > (s->bytes_total - s->bytes_sent)) {
 129                 sendbytes = s->bytes_total - s->bytes_sent;     // can't send more than we have
 130         }
 131
 132         send_this = ChrPtr(s->TheMessage);
 133         send_this += s->bytes_sent;                             // start where we last left off
 134
 135         memcpy(ptr, send_this, sendbytes);
 136         s->bytes_sent += sendbytes;
 137         return(sendbytes);                                      // return the number of bytes _actually_ copied
 138 }
 139
 140
 141 // The libcurl API doesn't provide a way to capture the actual SMTP result message returned
 142 // by the remote server.  This is an ugly way to extract it, by capturing debug data from
 143 // the library and filtering on the lines we want.
 144 int ctdl_libcurl_smtp_debug_callback(CURL *handle, curl_infotype type, char *data, size_t size, void *userptr) {
 145         if (type != CURLINFO_HEADER_IN)
 146                 return 0;
 147         if (!userptr)
 148                 return 0;
 149         char *debugbuf = (char *) userptr;
 150
 151         int len = strlen(debugbuf);
 152         if (len + size > SIZ)
 153                 return 0;
 154
 155         memcpy(&debugbuf[len], data, size);
 156         debugbuf[len + size] = 0;
 157         return 0;
 158 }
 159
 160
 161 // Go through the debug output of an SMTP transaction, and boil it down to just the final success or error response message.
 162 void trim_response(long response_code, char *response) {
 163         if ((response_code < 100) || (response_code > 999) || (IsEmptyStr(response))) {
 164                 return;
 165         }
 166
 167         char *t = malloc(strlen(response));
 168         if (!t) {
 169                 return;
 170         }
 171         t[0] = 0;
 172
 173         char *p;
 174         for (p = response; *p != 0; ++p) {
 175                 if ( (*p != '\n') && (!isprint(*p)) ) {         // expunge any nonprintables except for newlines
 176                         *p = ' ';
 177                 }
 178         }
 179
 180         char response_code_str[4];
 181         snprintf(response_code_str, sizeof response_code_str, "%ld", response_code);
 182         char *respstart = strstr(response, response_code_str);
 183         if (respstart == NULL) {                                // If we have a response code but no response text,
 184                 strcpy(response, smtpstatus(response_code));    // use one of our canned messages.
 185                 return;
 186         }
 187         strcpy(response, respstart);
 188
 189         p = strstr(response, "\n");
 190         if (p != NULL) {
 191                 *p = 0;
 192         }
 193 }
 194
 195
 196 // Attempt a delivery to one recipient.
 197 // Returns a three-digit SMTP status code.
 198 int smtp_attempt_delivery(long msgid, char *recp, char *envelope_from, char *source_room, char *response) {
 199         struct smtpmsgsrc s;
 200         char *fromaddr = NULL;
 201         CURL *curl;
 202         CURLcode res = CURLE_OK;
 203         struct curl_slist *recipients = NULL;
 204         long response_code = 421;
 205         int num_mx = 0;
 206         char mxes[SIZ];
 207         char user[1024];
 208         char node[1024];
 209         char name[1024];
 210         char try_this_mx[256];
 211         char smtp_url[512];
 212         int i;
 213
 214         syslog(LOG_DEBUG, "smtpclient: smtp_attempt_delivery(%ld, %s)", msgid, recp);
 215
 216         process_rfc822_addr(recp, user, node, name);    // split recipient address into username, hostname, displayname
 217         num_mx = getmx(mxes, node);
 218         if (num_mx < 1) {
 219                 return (421);
 220         }
 221
 222         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 223         if (!IsEmptyStr(source_room)) {
 224                 // If we have a source room, it's probably a mailing list message; generate an unsubscribe header
 225                 char esc_room[ROOMNAMELEN*2];
 226                 char esc_email[1024];
 227                 urlesc(esc_room, sizeof esc_room, source_room);
 228                 urlesc(esc_email, sizeof esc_email, recp);
 229                 cprintf("List-Unsubscribe: <http://%s/listsub?cmd=unsubscribe&room=%s&email=%s>\r\n",
 230                         CtdlGetConfigStr("c_fqdn"),
 231                         esc_room,
 232                         esc_email
 233                 );
 234         }
 235         CtdlOutputMsg(msgid, MT_RFC822, HEADERS_ALL, 0, 1, NULL, 0, NULL, &fromaddr, NULL);
 236         s.TheMessage = CC->redirect_buffer;
 237         s.bytes_total = StrLength(CC->redirect_buffer);
 238         s.bytes_sent = 0;
 239         CC->redirect_buffer = NULL;
 240         response_code = 421;
 241                                         // keep trying MXes until one works or we run out
 242         for (i = 0; ((i < num_mx) && ((response_code / 100) == 4)); ++i) {
 243                 response_code = 421;    // default 421 makes non-protocol errors transient
 244                 s.bytes_sent = 0;       // rewind our buffer in case we try multiple MXes
 245
 246                 curl = curl_easy_init();
 247                 if (curl) {
 248                         response[0] = 0;
 249
 250                         if (!IsEmptyStr(envelope_from)) {
 251                                 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, envelope_from);
 252                         }
 253                         else {
 254                                 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, fromaddr);
 255                         }
 256
 257                         recipients = curl_slist_append(recipients, recp);
 258                         curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
 259                         curl_easy_setopt(curl, CURLOPT_READFUNCTION, upload_source);
 260                         curl_easy_setopt(curl, CURLOPT_READDATA, &s);
 261                         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);                              // tell libcurl we are uploading
 262                         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 20L);                           // Time out after 20 seconds
 263                         if (CtdlGetConfigInt("c_smtpclient_disable_starttls") == 0) {
 264                                 curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_TRY);        // Attempt STARTTLS if offered
 265                         }
 266                         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
 267                         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
 268                         curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, ctdl_libcurl_smtp_debug_callback);
 269                         curl_easy_setopt(curl, CURLOPT_DEBUGDATA, (void *) response);
 270                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
 271
 272                         // Construct an SMTP URL in the form of:
 273                         //      smtp[s]://target_host/source_host
 274                         // This looks weird but libcurl uses that last part to set our name for EHLO or HELO.
 275                         // We check for "smtp://" and "smtps://" because the admin may have put those prefixes in a smart-host entry.
 276                         // If there is no prefix we add "smtp://"
 277                         extract_token(try_this_mx, mxes, i, '|', (sizeof try_this_mx - 7));
 278                         snprintf(smtp_url, sizeof smtp_url,
 279                                 "%s%s/%s",
 280                                 (((!strncasecmp(try_this_mx, HKEY("smtp://")))
 281                                 || (!strncasecmp(try_this_mx, HKEY("smtps://")))) ? "" : "smtp://"),
 282                                 try_this_mx, CtdlGetConfigStr("c_fqdn")
 283                         );
 284                         curl_easy_setopt(curl, CURLOPT_URL, smtp_url);
 285                         syslog(LOG_DEBUG, "smtpclient: trying MX %d of %d <%s>", i+1, num_mx, smtp_url);        // send the message
 286                         res = curl_easy_perform(curl);
 287                         curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
 288                         syslog(LOG_DEBUG,
 289                                "smtpclient: libcurl returned %d (%s) , SMTP response %ld",
 290                                res, curl_easy_strerror(res), response_code
 291                         );
 292
 293                         if ((res != CURLE_OK) && (response_code == 0)) {        // check for errors
 294                                 response_code = 421;
 295                         }
 296
 297                         curl_slist_free_all(recipients);
 298                         recipients = NULL;                                      // this gets reused; avoid double-free
 299                         curl_easy_cleanup(curl);
 300                         curl = NULL;                                            // this gets reused; avoid double-free
 301
 302                         // Trim the error message buffer down to just the actual message
 303                         trim_response(response_code, response);
 304                 }
 305         }
 306
 307         FreeStrBuf(&s.TheMessage);
 308         if (fromaddr) {
 309                 free(fromaddr);
 310         }
 311         return ((int) response_code);
 312 }
 313
 314
 315 // Process one outbound message.
 316 void smtp_process_one_msg(long qmsgnum) {
 317         struct CtdlMessage *msg = NULL;
 318         char *instr = NULL;
 319         int i;
 320         int num_success = 0;
 321         int num_fail = 0;
 322         int num_delayed = 0;
 323         long deletes[2];
 324         int delete_this_queue = 0;
 325         char server_response[SIZ];
 326
 327         msg = CtdlFetchMessage(qmsgnum, 1);
 328         if (msg == NULL) {
 329                 syslog(LOG_WARNING, "smtpclient: %ld does not exist", qmsgnum);
 330                 return;
 331         }
 332
 333         instr = msg->cm_fields[eMesageText];
 334         msg->cm_fields[eMesageText] = NULL;
 335         CM_Free(msg);
 336
 337         // if the queue message has any CRLF's convert them to LF's
 338         char *crlf = NULL;
 339         while (crlf = strstr(instr, "\r\n"), crlf != NULL) {
 340                 strcpy(crlf, crlf + 1);
 341         }
 342
 343         // Strip out the headers and we are now left with just the instructions.
 344         char *soi = strstr(instr, "\n\n");
 345         if (soi) {
 346                 strcpy(instr, soi + 2);
 347         }
 348
 349         long msgid = 0;
 350         time_t submitted = time(NULL);
 351         time_t attempted = 0;
 352         char *bounceto = NULL;
 353         char *envelope_from = NULL;
 354         char *source_room = NULL;
 355
 356         char cfgline[SIZ];
 357         for (i = 0; i < num_tokens(instr, '\n'); ++i) {
 358                 extract_token(cfgline, instr, i, '\n', sizeof cfgline);
 359                 if (!strncasecmp(cfgline, HKEY("msgid|")))
 360                         msgid = atol(&cfgline[6]);
 361                 if (!strncasecmp(cfgline, HKEY("submitted|")))
 362                         submitted = atol(&cfgline[10]);
 363                 if (!strncasecmp(cfgline, HKEY("attempted|")))
 364                         attempted = atol(&cfgline[10]);
 365                 if (!strncasecmp(cfgline, HKEY("bounceto|")))
 366                         bounceto = strdup(&cfgline[9]);
 367                 if (!strncasecmp(cfgline, HKEY("envelope_from|")))
 368                         envelope_from = strdup(&cfgline[14]);
 369                 if (!strncasecmp(cfgline, HKEY("source_room|")))
 370                         source_room = strdup(&cfgline[12]);
 371         }
 372
 373         int should_try_now = 0;
 374         if (attempted < submitted) {                    // If no attempts have been made yet, try now
 375                 should_try_now = 1;
 376         }
 377         else if ((attempted - submitted) <= 14400) {
 378                 if ((time(NULL) - attempted) > 1800) {  // First four hours, retry every 30 minutes
 379                         should_try_now = 1;
 380                 }
 381         }
 382         else {
 383                 if ((time(NULL) - attempted) > 14400) { // After that, retry once every 4 hours
 384                         should_try_now = 1;
 385                 }
 386         }
 387
 388         if (should_try_now) {
 389                 syslog(LOG_DEBUG, "smtpclient: attempting delivery of message <%ld> now", qmsgnum);
 390                 if (source_room) {
 391                         syslog(LOG_DEBUG, "smtpclient: this message originated in <%s>", source_room);
 392                 }
 393                 StrBuf *NewInstr = NewStrBuf();
 394                 StrBufAppendPrintf(NewInstr, "Content-type: " SPOOLMIME "\n\n");
 395                 StrBufAppendPrintf(NewInstr, "msgid|%ld\n", msgid);
 396                 StrBufAppendPrintf(NewInstr, "submitted|%ld\n", submitted);
 397                 if (bounceto) {
 398                         StrBufAppendPrintf(NewInstr, "bounceto|%s\n", bounceto);
 399                 }
 400                 if (envelope_from) {
 401                         StrBufAppendPrintf(NewInstr, "envelope_from|%s\n", envelope_from);
 402                 }
 403                 for (i = 0; i < num_tokens(instr, '\n'); ++i) {
 404                         extract_token(cfgline, instr, i, '\n', sizeof cfgline);
 405                         if (!strncasecmp(cfgline, HKEY("remote|"))) {
 406                                 char recp[SIZ];
 407                                 int previous_result = extract_int(cfgline, 2);
 408                                 if ((previous_result == 0) || (previous_result == 4)) {
 409                                         int new_result = 421;
 410                                         extract_token(recp, cfgline, 1, '|', sizeof recp);
 411                                         new_result = smtp_attempt_delivery(msgid, recp, envelope_from, source_room, server_response);
 412                                         syslog(LOG_DEBUG, "smtpclient: recp: <%s> , result: %d (%s)", recp, new_result, server_response);
 413                                         if ((new_result / 100) == 2) {
 414                                                 ++num_success;
 415                                         }
 416                                         else {
 417                                                 if ((new_result / 100) == 5) {
 418                                                         ++num_fail;
 419                                                 }
 420                                                 else {
 421                                                         ++num_delayed;
 422                                                 }
 423                                                 StrBufAppendPrintf(NewInstr, "remote|%s|%ld|%ld (%s)\n", recp, (new_result / 100), new_result, server_response);
 424                                         }
 425                                 }
 426                         }
 427                 }
 428
 429                 StrBufAppendPrintf(NewInstr, "attempted|%ld\n", time(NULL));
 430
 431                 // All deliveries have now been attempted.  Now determine the disposition of this queue entry.
 432
 433                 time_t age = time(NULL) - submitted;
 434                 syslog(LOG_DEBUG,
 435                        "smtpclient: submission age: %ldd%ldh%ldm%lds",
 436                        (age / 86400), ((age % 86400) / 3600), ((age % 3600) / 60), (age % 60));
 437                 syslog(LOG_DEBUG, "smtpclient: num_success=%d , num_fail=%d , num_delayed=%d", num_success, num_fail, num_delayed);
 438
 439                 // If there are permanent fails on this attempt, deliver a bounce to the user.
 440                 // The 5XX fails will be recorded in the rewritten queue, but they will be removed before the next attempt.
 441                 if (num_fail > 0) {
 442                         smtp_do_bounce(ChrPtr(NewInstr), SDB_BOUNCE_FATALS);
 443                 }
 444                 // If all deliveries have either succeeded or failed, we are finished with this queue entry.
 445                 if (num_delayed == 0) {
 446                         delete_this_queue = 1;
 447                 }
 448                 // If it's been more than five days, give up and tell the sender that delivery failed
 449                 else if ((time(NULL) - submitted) > SMTP_DELIVER_FAIL) {
 450                         smtp_do_bounce(ChrPtr(NewInstr), SDB_BOUNCE_ALL);
 451                         delete_this_queue = 1;
 452                 }
 453                 // If it's been more than four hours but less than five days, warn the sender that delivery is delayed
 454                 else if (((attempted - submitted) < SMTP_DELIVER_WARN) && ((time(NULL) - submitted) >= SMTP_DELIVER_WARN)) {
 455                         smtp_do_bounce(ChrPtr(NewInstr), SDB_WARN);
 456                 }
 457
 458                 if (delete_this_queue) {
 459                         syslog(LOG_DEBUG, "smtpclient: %ld deleting", qmsgnum);
 460                         deletes[0] = qmsgnum;
 461                         deletes[1] = msgid;
 462                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, deletes, 2, "");
 463                         FreeStrBuf(&NewInstr);  // We have to free NewInstr here, no longer needed
 464                 }
 465                 else {
 466                         // replace the old queue entry with the new one
 467                         syslog(LOG_DEBUG, "smtpclient: %ld rewriting", qmsgnum);
 468                         msg = convert_internet_message_buf(&NewInstr);  // This function will free NewInstr for us
 469                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
 470                         CM_Free(msg);
 471                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &qmsgnum, 1, "");
 472                 }
 473         }
 474         else {
 475                 syslog(LOG_DEBUG, "smtpclient: %ld retry time not reached", qmsgnum);
 476         }
 477
 478         if (bounceto != NULL) {
 479                 free(bounceto);
 480         }
 481         if (envelope_from != NULL) {
 482                 free(envelope_from);
 483         }
 484         if (source_room != NULL) {
 485                 free(source_room);
 486         }
 487         free(instr);
 488 }
 489
 490
 491 // Callback for smtp_do_queue()
 492 void smtp_add_msg(long msgnum, void *userdata) {
 493         Array *smtp_queue = (Array *) userdata;
 494         array_append(smtp_queue, &msgnum);
 495 }
 496
 497
 498 // Run through the queue sending out messages.
 499 void smtp_do_queue(void) {
 500         static int doing_smtpclient = 0;
 501         int i = 0;
 502
 503         // This is a concurrency check to make sure only one smtpclient run is done at a time.
 504         begin_critical_section(S_SMTPQUEUE);
 505         if (doing_smtpclient) {
 506                 end_critical_section(S_SMTPQUEUE);
 507                 return;
 508         }
 509         doing_smtpclient = 1;
 510         end_critical_section(S_SMTPQUEUE);
 511
 512         syslog(LOG_DEBUG, "smtpclient: start queue run");
 513
 514         if (CtdlGetRoom(&CC->room, SMTP_SPOOLOUT_ROOM) != 0) {
 515                 syslog(LOG_WARNING, "smtpclient: cannot find room <%s>", SMTP_SPOOLOUT_ROOM);
 516                 doing_smtpclient = 0;
 517                 return;
 518         }
 519
 520         // This array will hold the list of queue instruction messages
 521         Array *smtp_queue = array_new(sizeof(long));
 522         if (smtp_queue == NULL) {
 523                 syslog(LOG_WARNING, "smtpclient: cannot allocate queue array");
 524                 doing_smtpclient = 0;
 525                 return;
 526         }
 527
 528         // Put the queue in memory so we can close the db cursor
 529         // Searching for messages with a top level Content-type of SPOOLIME will give us only queue instruction messages.
 530         CtdlForEachMessage(MSGS_ALL, 0L, NULL, SPOOLMIME, NULL, smtp_add_msg, (void *)smtp_queue);
 531
 532         // We are ready to run through the queue now.
 533         for (i = 0; i < array_len(smtp_queue); ++i) {
 534                 long m;
 535                 memcpy(&m, array_get_element_at(smtp_queue, i), sizeof(long));
 536                 smtp_process_one_msg(m);
 537         }
 538
 539         array_free(smtp_queue);
 540         doing_smtpclient = 0;
 541         syslog(LOG_DEBUG, "smtpclient: end queue run");
 542 }
 543
 544
 545 // Initialization function, called from modules_init.c
 546 char *ctdl_module_init_smtpclient(void) {
 547         if (!threading) {
 548                 CtdlRegisterMessageHook(smtp_aftersave, EVT_AFTERSAVE);
 549                 CtdlRegisterSessionHook(smtp_do_queue, EVT_TIMER, PRIO_AGGR + 51);
 550                 smtp_init_spoolout();
 551         }
 552
 553         // return our module id for the log
 554         return "smtpclient";
 555 }