citadel/modules/smtp/serv_smtpclient.c

   1 /*
   2  * Transmit outbound SMTP mail to the big wide world of the Internet
   3  *
   4  * This is the new, exciting, clever version that makes libcurl do all the work  :)
   5  *
   6  * Copyright (c) 1997-2021 by the citadel.org team
   7  *
   8  * This program is open source software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as published
  10  * by the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21 #include <stdio.h>
  22 #include <sysconfig.h>
  23 #include <time.h>
  24 #include <ctype.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <libcitadel.h>
  30 #include <curl/curl.h>
  31 #include "citadel.h"
  32 #include "server.h"
  33 #include "citserver.h"
  34 #include "support.h"
  35 #include "config.h"
  36 #include "ctdl_module.h"
  37 #include "clientsocket.h"
  38 #include "msgbase.h"
  39 #include "domain.h"
  40 #include "internet_addressing.h"
  41 #include "citadel_dirs.h"
  42 #include "modules/smtp/smtp_util.h"
  43
  44 struct smtpmsgsrc {             // Data passed in and out of libcurl for message upload
  45         StrBuf *TheMessage;
  46         int bytes_total;
  47         int bytes_sent;
  48 };
  49
  50 static int doing_smtpclient = 0;
  51 long *smtpq = NULL;             // array of msgnums containing queue instructions
  52 int smtpq_count = 0;            // number of queue messages in smtpq
  53 int smtpq_alloc = 0;            // current allocation size for smtpq
  54
  55
  56 /*
  57  * Initialize the SMTP outbound queue
  58  */
  59 void smtp_init_spoolout(void) {
  60         struct ctdlroom qrbuf;
  61
  62         /*
  63          * Create the room.  This will silently fail if the room already
  64          * exists, and that's perfectly ok, because we want it to exist.
  65          */
  66         CtdlCreateRoom(SMTP_SPOOLOUT_ROOM, 3, "", 0, 1, 0, VIEW_QUEUE);
  67
  68         /*
  69          * Make sure it's set to be a "system room" so it doesn't show up
  70          * in the <K>nown rooms list for administrators.
  71          */
  72         if (CtdlGetRoomLock(&qrbuf, SMTP_SPOOLOUT_ROOM) == 0) {
  73                 qrbuf.QRflags2 |= QR2_SYSTEM;
  74                 CtdlPutRoomLock(&qrbuf);
  75         }
  76 }
  77
  78
  79 /* For internet mail, generate delivery instructions.
  80  * Yes, this is recursive.  Deal with it.  Infinite recursion does
  81  * not happen because the delivery instructions message does not
  82  * contain a recipient.
  83  */
  84 int smtp_aftersave(struct CtdlMessage *msg, struct recptypes *recps) {
  85         if ((recps != NULL) && (recps->num_internet > 0)) {
  86                 struct CtdlMessage *imsg = NULL;
  87                 char recipient[SIZ];
  88                 StrBuf *SpoolMsg = NewStrBuf();
  89                 long nTokens;
  90                 int i;
  91
  92                 syslog(LOG_DEBUG, "smtpclient: generating delivery instructions");
  93
  94                 StrBufPrintf(SpoolMsg,
  95                              "Content-type: " SPOOLMIME "\n"
  96                              "\n"
  97                              "msgid|%s\n"
  98                              "submitted|%ld\n" "bounceto|%s\n", msg->cm_fields[eVltMsgNum], (long) time(NULL), recps->bounce_to);
  99
 100                 if (recps->envelope_from != NULL) {
 101                         StrBufAppendBufPlain(SpoolMsg, HKEY("envelope_from|"), 0);
 102                         StrBufAppendBufPlain(SpoolMsg, recps->envelope_from, -1, 0);
 103                         StrBufAppendBufPlain(SpoolMsg, HKEY("\n"), 0);
 104                 }
 105                 if (recps->sending_room != NULL) {
 106                         StrBufAppendBufPlain(SpoolMsg, HKEY("source_room|"), 0);
 107                         StrBufAppendBufPlain(SpoolMsg, recps->sending_room, -1, 0);
 108                         StrBufAppendBufPlain(SpoolMsg, HKEY("\n"), 0);
 109                 }
 110
 111                 nTokens = num_tokens(recps->recp_internet, '|');
 112                 for (i = 0; i < nTokens; i++) {
 113                         long len;
 114                         len = extract_token(recipient, recps->recp_internet, i, '|', sizeof recipient);
 115                         if (len > 0) {
 116                                 StrBufAppendBufPlain(SpoolMsg, HKEY("remote|"), 0);
 117                                 StrBufAppendBufPlain(SpoolMsg, recipient, len, 0);
 118                                 StrBufAppendBufPlain(SpoolMsg, HKEY("|0||\n"), 0);
 119                         }
 120                 }
 121
 122                 imsg = malloc(sizeof(struct CtdlMessage));
 123                 memset(imsg, 0, sizeof(struct CtdlMessage));
 124                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 125                 imsg->cm_anon_type = MES_NORMAL;
 126                 imsg->cm_format_type = FMT_RFC822;
 127                 CM_SetField(imsg, eMsgSubject, HKEY("QMSG"));
 128                 CM_SetField(imsg, eAuthor, HKEY("Citadel"));
 129                 CM_SetField(imsg, eJournal, HKEY("do not journal"));
 130                 CM_SetAsFieldSB(imsg, eMesageText, &SpoolMsg);
 131                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 132                 CM_Free(imsg);
 133         }
 134         return 0;
 135 }
 136
 137
 138 /*
 139  * Callback for smtp_attempt_delivery() to supply libcurl with upload data.
 140  */
 141 static size_t upload_source(void *ptr, size_t size, size_t nmemb, void *userp) {
 142         struct smtpmsgsrc *s = (struct smtpmsgsrc *) userp;
 143         int sendbytes = 0;
 144         const char *send_this = NULL;
 145
 146         sendbytes = (size * nmemb);
 147
 148         if (s->bytes_sent >= s->bytes_total) {
 149                 return (0);     // no data remaining; we are done
 150         }
 151
 152         if (sendbytes > (s->bytes_total - s->bytes_sent)) {
 153                 sendbytes = s->bytes_total - s->bytes_sent;     // can't send more than we have
 154         }
 155
 156         send_this = ChrPtr(s->TheMessage);
 157         send_this += s->bytes_sent;     // start where we last left off
 158
 159         memcpy(ptr, send_this, sendbytes);
 160         s->bytes_sent += sendbytes;
 161         return (sendbytes);     // return the number of bytes _actually_ copied
 162 }
 163
 164
 165 /*
 166  * The libcurl API doesn't provide a way to capture the actual SMTP result message returned
 167  * by the remote server.  This is an ugly way to extract it, by capturing debug data from
 168  * the library and filtering on the lines we want.
 169  */
 170 int ctdl_libcurl_smtp_debug_callback(CURL *handle, curl_infotype type, char *data, size_t size, void *userptr) {
 171         if (type != CURLINFO_HEADER_IN)
 172                 return 0;
 173         if (!userptr)
 174                 return 0;
 175         char *debugbuf = (char *) userptr;
 176
 177         int len = strlen(debugbuf);
 178         if (len + size > SIZ)
 179                 return 0;
 180
 181         memcpy(&debugbuf[len], data, size);
 182         debugbuf[len + size] = 0;
 183         return 0;
 184 }
 185
 186
 187 /*
 188  * Go through the debug output of an SMTP transaction, and boil it down to just the final success or error response message.
 189  */
 190 void trim_response(long response_code, char *response) {
 191         if ((response_code < 100) || (response_code > 999) || (IsEmptyStr(response))) {
 192                 return;
 193         }
 194
 195         char *t = malloc(strlen(response));
 196         if (!t) {
 197                 return;
 198         }
 199         t[0] = 0;
 200
 201         char *p;
 202         for (p = response; *p != 0; ++p) {
 203                 if ( (*p != '\n') && (!isprint(*p)) ) {         // expunge any nonprintables except for newlines
 204                         *p = ' ';
 205                 }
 206         }
 207
 208         char response_code_str[4];
 209         snprintf(response_code_str, sizeof response_code_str, "%ld", response_code);
 210         char *respstart = strstr(response, response_code_str);
 211         if (respstart == NULL) {                                // If we have a response code but no response text,
 212                 strcpy(response, smtpstatus(response_code));    // use one of our canned messages.
 213                 return;
 214         }
 215         strcpy(response, respstart);
 216
 217         p = strstr(response, "\n");
 218         if (p != NULL) {
 219                 *p = 0;
 220         }
 221 }
 222
 223
 224 /*
 225  * Attempt a delivery to one recipient.
 226  * Returns a three-digit SMTP status code.
 227  */
 228 int smtp_attempt_delivery(long msgid, char *recp, char *envelope_from, char *response) {
 229         struct smtpmsgsrc s;
 230         char *fromaddr = NULL;
 231         CURL *curl;
 232         CURLcode res = CURLE_OK;
 233         struct curl_slist *recipients = NULL;
 234         long response_code = 421;
 235         int num_mx = 0;
 236         char mxes[SIZ];
 237         char user[1024];
 238         char node[1024];
 239         char name[1024];
 240         char try_this_mx[256];
 241         char smtp_url[512];
 242         int i;
 243
 244         syslog(LOG_DEBUG, "smtpclient: smtp_attempt_delivery(%ld, %s)", msgid, recp);
 245
 246         process_rfc822_addr(recp, user, node, name);    // split recipient address into username, hostname, displayname
 247         num_mx = getmx(mxes, node);
 248         if (num_mx < 1) {
 249                 return (421);
 250         }
 251
 252         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 253         CtdlOutputMsg(msgid, MT_RFC822, HEADERS_ALL, 0, 1, NULL, 0, NULL, &fromaddr, NULL);
 254         s.TheMessage = CC->redirect_buffer;
 255         s.bytes_total = StrLength(CC->redirect_buffer);
 256         s.bytes_sent = 0;
 257         CC->redirect_buffer = NULL;
 258         response_code = 421;
 259
 260         for (i = 0; ((i < num_mx) && ((response_code / 100) == 4)); ++i) {      // keep trying MXes until one works or we run out
 261                 response_code = 421;    // default 421 makes non-protocol errors transient
 262                 s.bytes_sent = 0;       // rewind our buffer in case we try multiple MXes
 263
 264                 curl = curl_easy_init();
 265                 if (curl) {
 266                         response[0] = 0;
 267
 268                         if (!IsEmptyStr(envelope_from)) {
 269                                 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, envelope_from);
 270                         } else {
 271                                 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, fromaddr);
 272                         }
 273
 274                         recipients = curl_slist_append(recipients, recp);
 275                         curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
 276                         curl_easy_setopt(curl, CURLOPT_READFUNCTION, upload_source);
 277                         curl_easy_setopt(curl, CURLOPT_READDATA, &s);
 278                         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);      // tell libcurl we are uploading
 279                         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 20L);   // Time out after 20 seconds
 280                         if (CtdlGetConfigInt("c_smtpclient_disable_starttls") == 0) {
 281                                 curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_TRY);        // Attempt STARTTLS if offered
 282                         }
 283                         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
 284                         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
 285                         curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, ctdl_libcurl_smtp_debug_callback);
 286                         curl_easy_setopt(curl, CURLOPT_DEBUGDATA, (void *) response);
 287                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
 288
 289                         // Construct an SMTP URL in the form of:
 290                         //      smtp[s]://target_host/source_host
 291                         // This looks weird but libcurl uses that last part to set our name for EHLO or HELO.
 292                         // We check for "smtp://" and "smtps://" because the admin may have put those prefixes in a smart-host entry.
 293                         // If there is no prefix we add "smtp://"
 294                         extract_token(try_this_mx, mxes, i, '|', (sizeof try_this_mx - 7));
 295                         snprintf(smtp_url, sizeof smtp_url, "%s%s/%s", (((!strncasecmp(try_this_mx, HKEY("smtp://")))
 296                                                                          ||
 297                                                                          (!strncasecmp
 298                                                                           (try_this_mx,
 299                                                                            HKEY("smtps://")))) ? "" : "smtp://"),
 300                                  try_this_mx, CtdlGetConfigStr("c_fqdn")
 301                             );
 302                         curl_easy_setopt(curl, CURLOPT_URL, smtp_url);
 303                         syslog(LOG_DEBUG, "smtpclient: trying MX %d of %d <%s>", i+1, num_mx, smtp_url);        // send the message
 304                         res = curl_easy_perform(curl);
 305                         curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
 306                         syslog(LOG_DEBUG,
 307                                "smtpclient: libcurl returned %d (%s) , SMTP response %ld",
 308                                res, curl_easy_strerror(res), response_code);
 309
 310                         if ((res != CURLE_OK) && (response_code == 0)) {        // check for errors
 311                                 response_code = 421;
 312                         }
 313
 314                         curl_slist_free_all(recipients);
 315                         recipients = NULL;      // this gets reused; avoid double-free
 316                         curl_easy_cleanup(curl);
 317                         curl = NULL;    // this gets reused; avoid double-free
 318
 319                         /* Trim the error message buffer down to just the actual message */
 320                         trim_response(response_code, response);
 321                 }
 322         }
 323
 324         FreeStrBuf(&s.TheMessage);
 325         if (fromaddr)
 326                 free(fromaddr);
 327         return ((int) response_code);
 328 }
 329
 330
 331 /*
 332  * Process one outbound message.
 333  */
 334 void smtp_process_one_msg(long qmsgnum) {
 335         struct CtdlMessage *msg = NULL;
 336         char *instr = NULL;
 337         int i;
 338         int num_success = 0;
 339         int num_fail = 0;
 340         int num_delayed = 0;
 341         long deletes[2];
 342         int delete_this_queue = 0;
 343         char server_response[SIZ];
 344
 345         msg = CtdlFetchMessage(qmsgnum, 1);
 346         if (msg == NULL) {
 347                 syslog(LOG_WARNING, "smtpclient: %ld does not exist", qmsgnum);
 348                 return;
 349         }
 350
 351         instr = msg->cm_fields[eMesageText];
 352         msg->cm_fields[eMesageText] = NULL;
 353         CM_Free(msg);
 354
 355         // if the queue message has any CRLF's convert them to LF's
 356         char *crlf = NULL;
 357         while (crlf = strstr(instr, "\r\n"), crlf != NULL) {
 358                 strcpy(crlf, crlf + 1);
 359         }
 360
 361         // Strip out the headers and we are now left with just the instructions.
 362         char *soi = strstr(instr, "\n\n");
 363         if (soi) {
 364                 strcpy(instr, soi + 2);
 365         }
 366
 367         long msgid = 0;
 368         time_t submitted = time(NULL);
 369         time_t attempted = 0;
 370         char *bounceto = NULL;
 371         char *envelope_from = NULL;
 372
 373         char cfgline[SIZ];
 374         for (i = 0; i < num_tokens(instr, '\n'); ++i) {
 375                 extract_token(cfgline, instr, i, '\n', sizeof cfgline);
 376                 if (!strncasecmp(cfgline, HKEY("msgid|")))
 377                         msgid = atol(&cfgline[6]);
 378                 if (!strncasecmp(cfgline, HKEY("submitted|")))
 379                         submitted = atol(&cfgline[10]);
 380                 if (!strncasecmp(cfgline, HKEY("attempted|")))
 381                         attempted = atol(&cfgline[10]);
 382                 if (!strncasecmp(cfgline, HKEY("bounceto|")))
 383                         bounceto = strdup(&cfgline[9]);
 384                 if (!strncasecmp(cfgline, HKEY("envelope_from|")))
 385                         envelope_from = strdup(&cfgline[14]);
 386         }
 387
 388         int should_try_now = 0;
 389         if (attempted < submitted) {    // If no attempts have been made yet, try now
 390                 should_try_now = 1;
 391         } else if ((attempted - submitted) <= 14400) {
 392                 if ((time(NULL) - attempted) > 1800) {  // First four hours, retry every 30 minutes
 393                         should_try_now = 1;
 394                 }
 395         } else {
 396                 if ((time(NULL) - attempted) > 14400) { // After that, retry once every 4 hours
 397                         should_try_now = 1;
 398                 }
 399         }
 400
 401         if (should_try_now) {
 402                 syslog(LOG_DEBUG, "smtpclient: %ld attempting delivery now", qmsgnum);
 403                 StrBuf *NewInstr = NewStrBuf();
 404                 StrBufAppendPrintf(NewInstr, "Content-type: " SPOOLMIME "\n\n");
 405                 StrBufAppendPrintf(NewInstr, "msgid|%ld\n", msgid);
 406                 StrBufAppendPrintf(NewInstr, "submitted|%ld\n", submitted);
 407                 if (bounceto)
 408                         StrBufAppendPrintf(NewInstr, "bounceto|%s\n", bounceto);
 409                 if (envelope_from)
 410                         StrBufAppendPrintf(NewInstr, "envelope_from|%s\n", envelope_from);
 411
 412                 for (i = 0; i < num_tokens(instr, '\n'); ++i) {
 413                         extract_token(cfgline, instr, i, '\n', sizeof cfgline);
 414                         if (!strncasecmp(cfgline, HKEY("remote|"))) {
 415                                 char recp[SIZ];
 416                                 int previous_result = extract_int(cfgline, 2);
 417                                 if ((previous_result == 0)
 418                                     || (previous_result == 4)) {
 419                                         int new_result = 421;
 420                                         extract_token(recp, cfgline, 1, '|', sizeof recp);
 421                                         new_result = smtp_attempt_delivery(msgid, recp, envelope_from, server_response);
 422                                         syslog(LOG_DEBUG,
 423                                                "smtpclient: recp: <%s> , result: %d (%s)", recp, new_result, server_response);
 424                                         if ((new_result / 100) == 2) {
 425                                                 ++num_success;
 426                                         } else {
 427                                                 if ((new_result / 100) == 5) {
 428                                                         ++num_fail;
 429                                                 } else {
 430                                                         ++num_delayed;
 431                                                 }
 432                                                 StrBufAppendPrintf
 433                                                     (NewInstr,
 434                                                      "remote|%s|%ld|%ld (%s)\n",
 435                                                      recp, (new_result / 100), new_result, server_response);
 436                                         }
 437                                 }
 438                         }
 439                 }
 440
 441                 StrBufAppendPrintf(NewInstr, "attempted|%ld\n", time(NULL));
 442
 443                 // All deliveries have now been attempted.  Now determine the disposition of this queue entry.
 444
 445                 time_t age = time(NULL) - submitted;
 446                 syslog(LOG_DEBUG,
 447                        "smtpclient: submission age: %ldd%ldh%ldm%lds",
 448                        (age / 86400), ((age % 86400) / 3600), ((age % 3600) / 60), (age % 60));
 449                 syslog(LOG_DEBUG, "smtpclient: num_success=%d , num_fail=%d , num_delayed=%d", num_success, num_fail, num_delayed);
 450
 451                 // If there are permanent fails on this attempt, deliver a bounce to the user.
 452                 // The 5XX fails will be recorded in the rewritten queue, but they will be removed before the next attempt.
 453                 if (num_fail > 0) {
 454                         smtp_do_bounce(ChrPtr(NewInstr), SDB_BOUNCE_FATALS);
 455                 }
 456                 // If all deliveries have either succeeded or failed, we are finished with this queue entry.
 457                 //
 458                 if (num_delayed == 0) {
 459                         delete_this_queue = 1;
 460                 }
 461                 // If it's been more than five days, give up and tell the sender that delivery failed
 462                 //
 463                 else if ((time(NULL) - submitted) > SMTP_DELIVER_FAIL) {
 464                         smtp_do_bounce(ChrPtr(NewInstr), SDB_BOUNCE_ALL);
 465                         delete_this_queue = 1;
 466                 }
 467                 // If it's been more than four hours but less than five days, warn the sender that delivery is delayed
 468                 //
 469                 else if (((attempted - submitted) < SMTP_DELIVER_WARN)
 470                          && ((time(NULL) - submitted) >= SMTP_DELIVER_WARN)) {
 471                         smtp_do_bounce(ChrPtr(NewInstr), SDB_WARN);
 472                 }
 473
 474                 if (delete_this_queue) {
 475                         syslog(LOG_DEBUG, "smtpclient: %ld deleting", qmsgnum);
 476                         deletes[0] = qmsgnum;
 477                         deletes[1] = msgid;
 478                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, deletes, 2, "");
 479                         FreeStrBuf(&NewInstr);  // We have to free NewInstr here, no longer needed
 480                 } else {
 481                         // replace the old queue entry with the new one
 482                         syslog(LOG_DEBUG, "smtpclient: %ld rewriting", qmsgnum);
 483                         msg = convert_internet_message_buf(&NewInstr);  // This function will free NewInstr for us
 484                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
 485                         CM_Free(msg);
 486                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &qmsgnum, 1, "");
 487                 }
 488         } else {
 489                 syslog(LOG_DEBUG, "smtpclient: %ld retry time not reached", qmsgnum);
 490         }
 491
 492         if (bounceto != NULL)
 493                 free(bounceto);
 494         if (envelope_from != NULL)
 495                 free(envelope_from);
 496         free(instr);
 497 }
 498
 499
 500 /*
 501  * Callback for smtp_do_queue()
 502  */
 503 void smtp_add_msg(long msgnum, void *userdata) {
 504
 505         if (smtpq == NULL) {
 506                 smtpq_count = 0;
 507                 smtpq_alloc = 100;
 508                 smtpq = malloc(smtpq_alloc * sizeof(long));
 509         }
 510
 511         if (smtpq_alloc >= smtpq_count) {
 512                 smtpq_alloc += 100;
 513                 smtpq = realloc(smtpq, (smtpq_alloc * sizeof(long)));
 514         }
 515
 516         smtpq[smtpq_count++] = msgnum;
 517 }
 518
 519
 520 /*
 521  * Run through the queue sending out messages.
 522  */
 523 void smtp_do_queue(void) {
 524         int i = 0;
 525
 526         /*
 527          * This is a simple concurrency check to make sure only one smtpclient
 528          * run is done at a time.  We could do this with a mutex, but since we
 529          * don't really require extremely fine granularity here, we'll do it
 530          * with a static variable instead.
 531          */
 532         if (doing_smtpclient)
 533                 return;
 534         doing_smtpclient = 1;
 535
 536         syslog(LOG_DEBUG, "smtpclient: start queue run");
 537
 538         if (CtdlGetRoom(&CC->room, SMTP_SPOOLOUT_ROOM) != 0) {
 539                 syslog(LOG_WARNING, "Cannot find room <%s>", SMTP_SPOOLOUT_ROOM);
 540                 doing_smtpclient = 0;
 541                 return;
 542         }
 543         // Put the queue in memory so we can close the db cursor
 544         CtdlForEachMessage(MSGS_ALL, 0L, NULL, SPOOLMIME, NULL, smtp_add_msg, NULL);
 545
 546         // We are ready to run through the queue now.
 547         for (i = 0; i < smtpq_count; ++i) {
 548                 smtp_process_one_msg(smtpq[i]);
 549         }
 550
 551         smtpq_count = 0;        // don't free it, we will use this memory on the next run
 552         doing_smtpclient = 0;
 553         syslog(LOG_DEBUG, "smtpclient: end queue run");
 554 }
 555
 556
 557 /*
 558  * Module entry point
 559  */
 560 CTDL_MODULE_INIT(smtpclient)
 561 {
 562         if (!threading) {
 563                 CtdlRegisterMessageHook(smtp_aftersave, EVT_AFTERSAVE);
 564                 CtdlRegisterSessionHook(smtp_do_queue, EVT_TIMER, PRIO_AGGR + 51);
 565                 smtp_init_spoolout();
 566         }
 567
 568         /* return our module id for the log */
 569         return "smtpclient";
 570 }