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) 1997-2020 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 {
  61         struct ctdlroom qrbuf;
  62
  63         /*
  64          * Create the room.  This will silently fail if the room already
  65          * exists, and that's perfectly ok, because we want it to exist.
  66          */
  67         CtdlCreateRoom(SMTP_SPOOLOUT_ROOM, 3, "", 0, 1, 0, VIEW_QUEUE);
  68
  69         /*
  70          * Make sure it's set to be a "system room" so it doesn't show up
  71          * in the <K>nown rooms list for administrators.
  72          */
  73         if (CtdlGetRoomLock(&qrbuf, SMTP_SPOOLOUT_ROOM) == 0) {
  74                 qrbuf.QRflags2 |= QR2_SYSTEM;
  75                 CtdlPutRoomLock(&qrbuf);
  76         }
  77 }
  78
  79
  80 /* For internet mail, generate delivery instructions.
  81  * Yes, this is recursive.  Deal with it.  Infinite recursion does
  82  * not happen because the delivery instructions message does not
  83  * contain a recipient.
  84  */
  85 int smtp_aftersave(struct CtdlMessage *msg, recptypes * recps)
  86 {
  87         if ((recps != NULL) && (recps->num_internet > 0)) {
  88                 struct CtdlMessage *imsg = NULL;
  89                 char recipient[SIZ];
  90                 StrBuf *SpoolMsg = NewStrBuf();
  91                 long nTokens;
  92                 int i;
  93
  94                 syslog(LOG_DEBUG, "smtpclient: generating delivery instructions");
  95
  96                 StrBufPrintf(SpoolMsg,
  97                              "Content-type: " SPOOLMIME "\n"
  98                              "\n"
  99                              "msgid|%s\n"
 100                              "submitted|%ld\n" "bounceto|%s\n", msg->cm_fields[eVltMsgNum], (long) time(NULL), recps->bounce_to);
 101
 102                 if (recps->envelope_from != NULL) {
 103                         StrBufAppendBufPlain(SpoolMsg, HKEY("envelope_from|"), 0);
 104                         StrBufAppendBufPlain(SpoolMsg, recps->envelope_from, -1, 0);
 105                         StrBufAppendBufPlain(SpoolMsg, HKEY("\n"), 0);
 106                 }
 107                 if (recps->sending_room != NULL) {
 108                         StrBufAppendBufPlain(SpoolMsg, HKEY("source_room|"), 0);
 109                         StrBufAppendBufPlain(SpoolMsg, recps->sending_room, -1, 0);
 110                         StrBufAppendBufPlain(SpoolMsg, HKEY("\n"), 0);
 111                 }
 112
 113                 nTokens = num_tokens(recps->recp_internet, '|');
 114                 for (i = 0; i < nTokens; i++) {
 115                         long len;
 116                         len = extract_token(recipient, recps->recp_internet, i, '|', sizeof recipient);
 117                         if (len > 0) {
 118                                 StrBufAppendBufPlain(SpoolMsg, HKEY("remote|"), 0);
 119                                 StrBufAppendBufPlain(SpoolMsg, recipient, len, 0);
 120                                 StrBufAppendBufPlain(SpoolMsg, HKEY("|0||\n"), 0);
 121                         }
 122                 }
 123
 124                 imsg = malloc(sizeof(struct CtdlMessage));
 125                 memset(imsg, 0, sizeof(struct CtdlMessage));
 126                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 127                 imsg->cm_anon_type = MES_NORMAL;
 128                 imsg->cm_format_type = FMT_RFC822;
 129                 CM_SetField(imsg, eMsgSubject, HKEY("QMSG"));
 130                 CM_SetField(imsg, eAuthor, HKEY("Citadel"));
 131                 CM_SetField(imsg, eJournal, HKEY("do not journal"));
 132                 CM_SetAsFieldSB(imsg, eMesageText, &SpoolMsg);
 133                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 134                 CM_Free(imsg);
 135         }
 136         return 0;
 137 }
 138
 139
 140 /*
 141  * Callback for smtp_attempt_delivery() to supply libcurl with upload data.
 142  */
 143 static size_t upload_source(void *ptr, size_t size, size_t nmemb, void *userp)
 144 {
 145         struct smtpmsgsrc *s = (struct smtpmsgsrc *) userp;
 146         int sendbytes = 0;
 147         const char *send_this = NULL;
 148
 149         sendbytes = (size * nmemb);
 150
 151         if (s->bytes_sent >= s->bytes_total) {
 152                 return (0);     // no data remaining; we are done
 153         }
 154
 155         if (sendbytes > (s->bytes_total - s->bytes_sent)) {
 156                 sendbytes = s->bytes_total - s->bytes_sent;     // can't send more than we have
 157         }
 158
 159         send_this = ChrPtr(s->TheMessage);
 160         send_this += s->bytes_sent;     // start where we last left off
 161
 162         memcpy(ptr, send_this, sendbytes);
 163         s->bytes_sent += sendbytes;
 164         return (sendbytes);     // return the number of bytes _actually_ copied
 165 }
 166
 167
 168 /*
 169  * The libcurl API doesn't provide a way to capture the actual SMTP result message returned
 170  * by the remote server.  This is an ugly way to extract it, by capturing debug data from
 171  * the library and filtering on the lines we want.
 172  */
 173 int ctdl_libcurl_smtp_debug_callback(CURL *handle, curl_infotype type, char *data, size_t size, void *userptr)
 174 {
 175         if (type != CURLINFO_HEADER_IN)
 176                 return 0;
 177         if (!userptr)
 178                 return 0;
 179         char *debugbuf = (char *) userptr;
 180
 181         int len = strlen(debugbuf);
 182         if (len + size > SIZ)
 183                 return 0;
 184
 185         memcpy(&debugbuf[len], data, size);
 186         debugbuf[len + size] = 0;
 187         return 0;
 188 }
 189
 190
 191 /*
 192  * Go through the debug output of an SMTP transaction, and boil it down to just the final success or error response message.
 193  */
 194 void trim_response(long response_code, char *response)
 195 {
 196         if ((response_code < 100) || (response_code > 999) || (IsEmptyStr(response))) {
 197                 return;
 198         }
 199
 200         char *t = malloc(strlen(response));
 201         if (!t) {
 202                 return;
 203         }
 204         t[0] = 0;
 205
 206         char *p;
 207         for (p = response; *p != 0; ++p) {
 208                 if ( (*p != '\n') && (!isprint(*p)) ) {         // expunge any nonprintables except for newlines
 209                         *p = ' ';
 210                 }
 211         }
 212
 213         char response_code_str[4];
 214         snprintf(response_code_str, sizeof response_code_str, "%ld", response_code);
 215         char *respstart = strstr(response, response_code_str);
 216         if (respstart == NULL) {
 217                 strcpy(response, smtpstatus(response_code));
 218                 return;
 219         }
 220         strcpy(response, respstart);
 221
 222         p = strstr(response, "\n");
 223         if (p != NULL) {
 224                 *p = 0;
 225         }
 226 }
 227
 228
 229 /*
 230  * Attempt a delivery to one recipient.
 231  * Returns a three-digit SMTP status code.
 232  */
 233 int smtp_attempt_delivery(long msgid, char *recp, char *envelope_from, char *response)
 234 {
 235         struct smtpmsgsrc s;
 236         char *fromaddr = NULL;
 237         CURL *curl;
 238         CURLcode res = CURLE_OK;
 239         struct curl_slist *recipients = NULL;
 240         long response_code = 421;
 241         int num_mx = 0;
 242         char mxes[SIZ];
 243         char user[1024];
 244         char node[1024];
 245         char name[1024];
 246         char try_this_mx[256];
 247         char smtp_url[512];
 248         int i;
 249
 250         syslog(LOG_DEBUG, "smtpclient: smtp_attempt_delivery(%ld, %s)", msgid, recp);
 251
 252         process_rfc822_addr(recp, user, node, name);    // split recipient address into username, hostname, displayname
 253         num_mx = getmx(mxes, node);
 254         if (num_mx < 1) {
 255                 return (421);
 256         }
 257
 258         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 259         CtdlOutputMsg(msgid, MT_RFC822, HEADERS_ALL, 0, 1, NULL, 0, NULL, &fromaddr, NULL);
 260         s.TheMessage = CC->redirect_buffer;
 261         s.bytes_total = StrLength(CC->redirect_buffer);
 262         s.bytes_sent = 0;
 263         CC->redirect_buffer = NULL;
 264         response_code = 421;
 265
 266         for (i = 0; ((i < num_mx) && ((response_code / 100) == 4)); ++i) {      // keep trying MXes until one works or we run out
 267                 response_code = 421;    // default 421 makes non-protocol errors transient
 268                 s.bytes_sent = 0;       // rewind our buffer in case we try multiple MXes
 269
 270                 curl = curl_easy_init();
 271                 if (curl) {
 272                         response[0] = 0;
 273
 274                         if (!IsEmptyStr(envelope_from)) {
 275                                 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, envelope_from);
 276                         } else {
 277                                 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, fromaddr);
 278                         }
 279
 280                         recipients = curl_slist_append(recipients, recp);
 281                         curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
 282                         curl_easy_setopt(curl, CURLOPT_READFUNCTION, upload_source);
 283                         curl_easy_setopt(curl, CURLOPT_READDATA, &s);
 284                         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);      // tell libcurl we are uploading
 285                         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 20L);   // Time out after 20 seconds
 286                         if (CtdlGetConfigInt("c_smtpclient_disable_starttls") == 0) {
 287                                 curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_TRY);        // Attempt STARTTLS if offered
 288                         }
 289                         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
 290                         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
 291                         curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, ctdl_libcurl_smtp_debug_callback);
 292                         curl_easy_setopt(curl, CURLOPT_DEBUGDATA, (void *) response);
 293                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
 294
 295                         // Construct an SMTP URL in the form of:
 296                         //      smtp[s]://target_host/source_host
 297                         // This looks weird but libcurl uses that last part to set our name for EHLO or HELO.
 298                         // We check for "smtp://" and "smtps://" because the admin may have put those prefixes in a smart-host entry.
 299                         // If there is no prefix we add "smtp://"
 300                         extract_token(try_this_mx, mxes, i, '|', (sizeof try_this_mx - 7));
 301                         snprintf(smtp_url, sizeof smtp_url, "%s%s/%s", (((!strncasecmp(try_this_mx, HKEY("smtp://")))
 302                                                                          ||
 303                                                                          (!strncasecmp
 304                                                                           (try_this_mx,
 305                                                                            HKEY("smtps://")))) ? "" : "smtp://"),
 306                                  try_this_mx, CtdlGetConfigStr("c_fqdn")
 307                             );
 308                         curl_easy_setopt(curl, CURLOPT_URL, smtp_url);
 309                         syslog(LOG_DEBUG, "smtpclient: trying %s", smtp_url);   // send the message
 310                         res = curl_easy_perform(curl);
 311                         curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
 312                         syslog(LOG_DEBUG,
 313                                "smtpclient: libcurl returned %d (%s) , SMTP response %ld",
 314                                res, curl_easy_strerror(res), response_code);
 315
 316                         if ((res != CURLE_OK) && (response_code == 0)) {        // check for errors
 317                                 response_code = 421;
 318                         }
 319
 320                         curl_slist_free_all(recipients);
 321                         recipients = NULL;      // this gets reused; avoid double-free
 322                         curl_easy_cleanup(curl);
 323                         curl = NULL;    // this gets reused; avoid double-free
 324
 325                         /* Trim the error message buffer down to just the actual message */
 326                         trim_response(response_code, response);
 327                 }
 328         }
 329
 330         FreeStrBuf(&s.TheMessage);
 331         if (fromaddr)
 332                 free(fromaddr);
 333         return ((int) response_code);
 334 }
 335
 336
 337 /*
 338  * Process one outbound message.
 339  */
 340 void smtp_process_one_msg(long qmsgnum)
 341 {
 342         struct CtdlMessage *msg = NULL;
 343         char *instr = NULL;
 344         int i;
 345         int num_success = 0;
 346         int num_fail = 0;
 347         int num_delayed = 0;
 348         long deletes[2];
 349         int delete_this_queue = 0;
 350         char server_response[SIZ];
 351
 352         msg = CtdlFetchMessage(qmsgnum, 1);
 353         if (msg == NULL) {
 354                 syslog(LOG_WARNING, "smtpclient: %ld does not exist", qmsgnum);
 355                 return;
 356         }
 357
 358         instr = msg->cm_fields[eMesageText];
 359         msg->cm_fields[eMesageText] = NULL;
 360         CM_Free(msg);
 361
 362         // if the queue message has any CRLF's convert them to LF's
 363         char *crlf = NULL;
 364         while (crlf = strstr(instr, "\r\n"), crlf != NULL) {
 365                 strcpy(crlf, crlf + 1);
 366         }
 367
 368         // Strip out the headers and we are now left with just the instructions.
 369         char *soi = strstr(instr, "\n\n");
 370         if (soi) {
 371                 strcpy(instr, soi + 2);
 372         }
 373
 374         long msgid = 0;
 375         time_t submitted = time(NULL);
 376         time_t attempted = 0;
 377         char *bounceto = NULL;
 378         char *envelope_from = NULL;
 379
 380         char cfgline[SIZ];
 381         for (i = 0; i < num_tokens(instr, '\n'); ++i) {
 382                 extract_token(cfgline, instr, i, '\n', sizeof cfgline);
 383                 if (!strncasecmp(cfgline, HKEY("msgid|")))
 384                         msgid = atol(&cfgline[6]);
 385                 if (!strncasecmp(cfgline, HKEY("submitted|")))
 386                         submitted = atol(&cfgline[10]);
 387                 if (!strncasecmp(cfgline, HKEY("attempted|")))
 388                         attempted = atol(&cfgline[10]);
 389                 if (!strncasecmp(cfgline, HKEY("bounceto|")))
 390                         bounceto = strdup(&cfgline[9]);
 391                 if (!strncasecmp(cfgline, HKEY("envelope_from|")))
 392                         envelope_from = strdup(&cfgline[14]);
 393         }
 394
 395         int should_try_now = 0;
 396         if (attempted < submitted) {    // If no attempts have been made yet, try now
 397                 should_try_now = 1;
 398         } else if ((attempted - submitted) <= 14400) {
 399                 if ((time(NULL) - attempted) > 1800) {  // First four hours, retry every 30 minutes
 400                         should_try_now = 1;
 401                 }
 402         } else {
 403                 if ((time(NULL) - attempted) > 14400) { // After that, retry once every 4 hours
 404                         should_try_now = 1;
 405                 }
 406         }
 407
 408         if (should_try_now) {
 409                 syslog(LOG_DEBUG, "smtpclient: %ld attempting delivery now", qmsgnum);
 410                 StrBuf *NewInstr = NewStrBuf();
 411                 StrBufAppendPrintf(NewInstr, "Content-type: " SPOOLMIME "\n\n");
 412                 StrBufAppendPrintf(NewInstr, "msgid|%ld\n", msgid);
 413                 StrBufAppendPrintf(NewInstr, "submitted|%ld\n", submitted);
 414                 if (bounceto)
 415                         StrBufAppendPrintf(NewInstr, "bounceto|%s\n", bounceto);
 416                 if (envelope_from)
 417                         StrBufAppendPrintf(NewInstr, "envelope_from|%s\n", envelope_from);
 418
 419                 for (i = 0; i < num_tokens(instr, '\n'); ++i) {
 420                         extract_token(cfgline, instr, i, '\n', sizeof cfgline);
 421                         if (!strncasecmp(cfgline, HKEY("remote|"))) {
 422                                 char recp[SIZ];
 423                                 int previous_result = extract_int(cfgline, 2);
 424                                 if ((previous_result == 0)
 425                                     || (previous_result == 4)) {
 426                                         int new_result = 421;
 427                                         extract_token(recp, cfgline, 1, '|', sizeof recp);
 428                                         new_result = smtp_attempt_delivery(msgid, recp, envelope_from, server_response);
 429                                         syslog(LOG_DEBUG,
 430                                                "smtpclient: recp: <%s> , result: %d (%s)", recp, new_result, server_response);
 431                                         if ((new_result / 100) == 2) {
 432                                                 ++num_success;
 433                                         } else {
 434                                                 if ((new_result / 100) == 5) {
 435                                                         ++num_fail;
 436                                                 } else {
 437                                                         ++num_delayed;
 438                                                 }
 439                                                 StrBufAppendPrintf
 440                                                     (NewInstr,
 441                                                      "remote|%s|%ld|%ld (%s)\n",
 442                                                      recp, (new_result / 100), new_result, server_response);
 443                                         }
 444                                 }
 445                         }
 446                 }
 447
 448                 StrBufAppendPrintf(NewInstr, "attempted|%ld\n", time(NULL));
 449
 450                 // All deliveries have now been attempted.  Now determine the disposition of this queue entry.
 451
 452                 time_t age = time(NULL) - submitted;
 453                 syslog(LOG_DEBUG,
 454                        "smtpclient: submission age: %ldd%ldh%ldm%lds",
 455                        (age / 86400), ((age % 86400) / 3600), ((age % 3600) / 60), (age % 60));
 456                 syslog(LOG_DEBUG, "smtpclient: num_success=%d , num_fail=%d , num_delayed=%d", num_success, num_fail, num_delayed);
 457
 458                 // If there are permanent fails on this attempt, deliver a bounce to the user.
 459                 // The 5XX fails will be recorded in the rewritten queue, but they will be removed before the next attempt.
 460                 if (num_fail > 0) {
 461                         smtp_do_bounce(ChrPtr(NewInstr), SDB_BOUNCE_FATALS);
 462                 }
 463                 // If all deliveries have either succeeded or failed, we are finished with this queue entry.
 464                 //
 465                 if (num_delayed == 0) {
 466                         delete_this_queue = 1;
 467                 }
 468                 // If it's been more than five days, give up and tell the sender that delivery failed
 469                 //
 470                 else if ((time(NULL) - submitted) > SMTP_DELIVER_FAIL) {
 471                         smtp_do_bounce(ChrPtr(NewInstr), SDB_BOUNCE_ALL);
 472                         delete_this_queue = 1;
 473                 }
 474                 // If it's been more than four hours but less than five days, warn the sender that delivery is delayed
 475                 //
 476                 else if (((attempted - submitted) < SMTP_DELIVER_WARN)
 477                          && ((time(NULL) - submitted) >= SMTP_DELIVER_WARN)) {
 478                         smtp_do_bounce(ChrPtr(NewInstr), SDB_WARN);
 479                 }
 480
 481                 if (delete_this_queue) {
 482                         syslog(LOG_DEBUG, "smtpclient: %ld deleting", qmsgnum);
 483                         deletes[0] = qmsgnum;
 484                         deletes[1] = msgid;
 485                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, deletes, 2, "");
 486                         FreeStrBuf(&NewInstr);  // We have to free NewInstr here, no longer needed
 487                 } else {
 488                         // replace the old queue entry with the new one
 489                         syslog(LOG_DEBUG, "smtpclient: %ld rewriting", qmsgnum);
 490                         msg = convert_internet_message_buf(&NewInstr);  // This function will free NewInstr for us
 491                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
 492                         CM_Free(msg);
 493                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &qmsgnum, 1, "");
 494                 }
 495         } else {
 496                 syslog(LOG_DEBUG, "smtpclient: %ld retry time not reached", qmsgnum);
 497         }
 498
 499         if (bounceto != NULL)
 500                 free(bounceto);
 501         if (envelope_from != NULL)
 502                 free(envelope_from);
 503         free(instr);
 504 }
 505
 506
 507 /*
 508  * Callback for smtp_do_queue()
 509  */
 510 void smtp_add_msg(long msgnum, void *userdata)
 511 {
 512
 513         if (smtpq == NULL) {
 514                 smtpq_count = 0;
 515                 smtpq_alloc = 100;
 516                 smtpq = malloc(smtpq_alloc * sizeof(long));
 517         }
 518
 519         if (smtpq_alloc >= smtpq_count) {
 520                 smtpq_alloc += 100;
 521                 smtpq = realloc(smtpq, (smtpq_alloc * sizeof(long)));
 522         }
 523
 524         smtpq[smtpq_count++] = msgnum;
 525 }
 526
 527
 528 /*
 529  * Run through the queue sending out messages.
 530  */
 531 void smtp_do_queue(void)
 532 {
 533         int i = 0;
 534
 535         /*
 536          * This is a simple concurrency check to make sure only one smtpclient
 537          * run is done at a time.  We could do this with a mutex, but since we
 538          * don't really require extremely fine granularity here, we'll do it
 539          * with a static variable instead.
 540          */
 541         if (doing_smtpclient)
 542                 return;
 543         doing_smtpclient = 1;
 544
 545         syslog(LOG_DEBUG, "smtpclient: start queue run");
 546
 547         if (CtdlGetRoom(&CC->room, SMTP_SPOOLOUT_ROOM) != 0) {
 548                 syslog(LOG_WARNING, "Cannot find room <%s>", SMTP_SPOOLOUT_ROOM);
 549                 doing_smtpclient = 0;
 550                 return;
 551         }
 552         // Put the queue in memory so we can close the db cursor
 553         CtdlForEachMessage(MSGS_ALL, 0L, NULL, SPOOLMIME, NULL, smtp_add_msg, NULL);
 554
 555         // We are ready to run through the queue now.
 556         for (i = 0; i < smtpq_count; ++i) {
 557                 smtp_process_one_msg(smtpq[i]);
 558         }
 559
 560         smtpq_count = 0;        // don't free it, we will use this memory on the next run
 561         doing_smtpclient = 0;
 562         syslog(LOG_DEBUG, "smtpclient: end queue run");
 563 }
 564
 565
 566 /*
 567  * Module entry point
 568  */
 569 CTDL_MODULE_INIT(smtpclient)
 570 {
 571         if (!threading) {
 572                 CtdlRegisterMessageHook(smtp_aftersave, EVT_AFTERSAVE);
 573                 CtdlRegisterSessionHook(smtp_do_queue, EVT_TIMER, PRIO_AGGR + 50);
 574                 smtp_init_spoolout();
 575         }
 576
 577         /* return our module id for the log */
 578         return "smtpclient";
 579 }