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
  24 #if TIME_WITH_SYS_TIME
  25 #include <sys/time.h>
  26 #include <time.h>
  27 #else
  28 #if HAVE_SYS_TIME_H
  29 #include <sys/time.h>
  30 #else
  31 #include <time.h>
  32 #endif
  33 #endif
  34
  35 #include <ctype.h>
  36 #include <string.h>
  37 #include <errno.h>
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <libcitadel.h>
  41 #include <curl/curl.h>
  42 #include "citadel.h"
  43 #include "server.h"
  44 #include "citserver.h"
  45 #include "support.h"
  46 #include "config.h"
  47 #include "ctdl_module.h"
  48 #include "clientsocket.h"
  49 #include "msgbase.h"
  50 #include "domain.h"
  51 #include "internet_addressing.h"
  52 #include "citadel_dirs.h"
  53 #include "modules/smtp/smtp_util.h"
  54
  55 struct smtpmsgsrc {             // Data passed in and out of libcurl for message upload
  56         StrBuf *TheMessage;
  57         int bytes_total;
  58         int bytes_sent;
  59 };
  60
  61 static int doing_smtpclient = 0;
  62 long *smtpq = NULL;             // array of msgnums containing queue instructions
  63 int smtpq_count = 0;            // number of queue messages in smtpq
  64 int smtpq_alloc = 0;            // current allocation size for smtpq
  65
  66
  67 /*
  68  * Initialize the SMTP outbound queue
  69  */
  70 void smtp_init_spoolout(void)
  71 {
  72         struct ctdlroom qrbuf;
  73
  74         /*
  75          * Create the room.  This will silently fail if the room already
  76          * exists, and that's perfectly ok, because we want it to exist.
  77          */
  78         CtdlCreateRoom(SMTP_SPOOLOUT_ROOM, 3, "", 0, 1, 0, VIEW_QUEUE);
  79
  80         /*
  81          * Make sure it's set to be a "system room" so it doesn't show up
  82          * in the <K>nown rooms list for administrators.
  83          */
  84         if (CtdlGetRoomLock(&qrbuf, SMTP_SPOOLOUT_ROOM) == 0) {
  85                 qrbuf.QRflags2 |= QR2_SYSTEM;
  86                 CtdlPutRoomLock(&qrbuf);
  87         }
  88 }
  89
  90
  91 /* For internet mail, generate delivery instructions.
  92  * Yes, this is recursive.  Deal with it.  Infinite recursion does
  93  * not happen because the delivery instructions message does not
  94  * contain a recipient.
  95  */
  96 int smtp_aftersave(struct CtdlMessage *msg, recptypes * recps)
  97 {
  98         if ((recps != NULL) && (recps->num_internet > 0)) {
  99                 struct CtdlMessage *imsg = NULL;
 100                 char recipient[SIZ];
 101                 StrBuf *SpoolMsg = NewStrBuf();
 102                 long nTokens;
 103                 int i;
 104
 105                 syslog(LOG_DEBUG, "smtpclient: generating delivery instructions");
 106
 107                 StrBufPrintf(SpoolMsg,
 108                              "Content-type: " SPOOLMIME "\n"
 109                              "\n"
 110                              "msgid|%s\n"
 111                              "submitted|%ld\n" "bounceto|%s\n", msg->cm_fields[eVltMsgNum], (long) time(NULL), recps->bounce_to);
 112
 113                 if (recps->envelope_from != NULL) {
 114                         StrBufAppendBufPlain(SpoolMsg, HKEY("envelope_from|"), 0);
 115                         StrBufAppendBufPlain(SpoolMsg, recps->envelope_from, -1, 0);
 116                         StrBufAppendBufPlain(SpoolMsg, HKEY("\n"), 0);
 117                 }
 118                 if (recps->sending_room != NULL) {
 119                         StrBufAppendBufPlain(SpoolMsg, HKEY("source_room|"), 0);
 120                         StrBufAppendBufPlain(SpoolMsg, recps->sending_room, -1, 0);
 121                         StrBufAppendBufPlain(SpoolMsg, HKEY("\n"), 0);
 122                 }
 123
 124                 nTokens = num_tokens(recps->recp_internet, '|');
 125                 for (i = 0; i < nTokens; i++) {
 126                         long len;
 127                         len = extract_token(recipient, recps->recp_internet, i, '|', sizeof recipient);
 128                         if (len > 0) {
 129                                 StrBufAppendBufPlain(SpoolMsg, HKEY("remote|"), 0);
 130                                 StrBufAppendBufPlain(SpoolMsg, recipient, len, 0);
 131                                 StrBufAppendBufPlain(SpoolMsg, HKEY("|0||\n"), 0);
 132                         }
 133                 }
 134
 135                 imsg = malloc(sizeof(struct CtdlMessage));
 136                 memset(imsg, 0, sizeof(struct CtdlMessage));
 137                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 138                 imsg->cm_anon_type = MES_NORMAL;
 139                 imsg->cm_format_type = FMT_RFC822;
 140                 CM_SetField(imsg, eMsgSubject, HKEY("QMSG"));
 141                 CM_SetField(imsg, eAuthor, HKEY("Citadel"));
 142                 CM_SetField(imsg, eJournal, HKEY("do not journal"));
 143                 CM_SetAsFieldSB(imsg, eMesageText, &SpoolMsg);
 144                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM);
 145                 CM_Free(imsg);
 146         }
 147         return 0;
 148 }
 149
 150
 151 /*
 152  * Callback for smtp_attempt_delivery() to supply libcurl with upload data.
 153  */
 154 static size_t upload_source(void *ptr, size_t size, size_t nmemb, void *userp)
 155 {
 156         struct smtpmsgsrc *s = (struct smtpmsgsrc *) userp;
 157         int sendbytes = 0;
 158         const char *send_this = NULL;
 159
 160         sendbytes = (size * nmemb);
 161
 162         if (s->bytes_sent >= s->bytes_total) {
 163                 return (0);     // no data remaining; we are done
 164         }
 165
 166         if (sendbytes > (s->bytes_total - s->bytes_sent)) {
 167                 sendbytes = s->bytes_total - s->bytes_sent;     // can't send more than we have
 168         }
 169
 170         send_this = ChrPtr(s->TheMessage);
 171         send_this += s->bytes_sent;     // start where we last left off
 172
 173         memcpy(ptr, send_this, sendbytes);
 174         s->bytes_sent += sendbytes;
 175         return (sendbytes);     // return the number of bytes _actually_ copied
 176 }
 177
 178
 179 /*
 180  * The libcurl API doesn't provide a way to capture the actual SMTP result message returned
 181  * by the remote server.  This is an ugly way to extract it, by capturing debug data from
 182  * the library and filtering on the lines we want.
 183  */
 184 int ctdl_libcurl_smtp_debug_callback(CURL *handle, curl_infotype type, char *data, size_t size, void *userptr)
 185 {
 186         if (type != CURLINFO_HEADER_IN)
 187                 return 0;
 188         if (!userptr)
 189                 return 0;
 190         char *debugbuf = (char *) userptr;
 191
 192         int len = strlen(debugbuf);
 193         if (len + size > SIZ)
 194                 return 0;
 195
 196         memcpy(&debugbuf[len], data, size);
 197         debugbuf[len + size] = 0;
 198         return 0;
 199 }
 200
 201
 202 /*
 203  * Go through the debug output of an SMTP transaction, and boil it down to just the final success or error response message.
 204  */
 205 void trim_response(long response_code, char *response)
 206 {
 207         if ((response_code < 100) || (response_code > 999) || (IsEmptyStr(response))) {
 208                 return;
 209         }
 210
 211         char *t = malloc(strlen(response));
 212         if (!t) {
 213                 return;
 214         }
 215         t[0] = 0;
 216
 217         char *p;
 218         for (p = response; *p != 0; ++p) {
 219                 if ( (*p != '\n') && (!isprint(*p)) ) {         // expunge any nonprintables except for newlines
 220                         *p = ' ';
 221                 }
 222         }
 223
 224         char response_code_str[4];
 225         snprintf(response_code_str, sizeof response_code_str, "%ld", response_code);
 226         char *respstart = strstr(response, response_code_str);
 227         if (respstart == NULL) {
 228                 strcpy(response, smtpstatus(response_code));
 229                 return;
 230         }
 231         strcpy(response, respstart);
 232
 233         p = strstr(response, "\n");
 234         if (p != NULL) {
 235                 *p = 0;
 236         }
 237 }
 238
 239
 240 /*
 241  * Attempt a delivery to one recipient.
 242  * Returns a three-digit SMTP status code.
 243  */
 244 int smtp_attempt_delivery(long msgid, char *recp, char *envelope_from, char *response)
 245 {
 246         struct smtpmsgsrc s;
 247         char *fromaddr = NULL;
 248         CURL *curl;
 249         CURLcode res = CURLE_OK;
 250         struct curl_slist *recipients = NULL;
 251         long response_code = 421;
 252         int num_mx = 0;
 253         char mxes[SIZ];
 254         char user[1024];
 255         char node[1024];
 256         char name[1024];
 257         char try_this_mx[256];
 258         char smtp_url[512];
 259         int i;
 260
 261         syslog(LOG_DEBUG, "smtpclient: smtp_attempt_delivery(%ld, %s)", msgid, recp);
 262
 263         process_rfc822_addr(recp, user, node, name);    // split recipient address into username, hostname, displayname
 264         num_mx = getmx(mxes, node);
 265         if (num_mx < 1) {
 266                 return (421);
 267         }
 268
 269         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 270         CtdlOutputMsg(msgid, MT_RFC822, HEADERS_ALL, 0, 1, NULL, 0, NULL, &fromaddr, NULL);
 271         s.TheMessage = CC->redirect_buffer;
 272         s.bytes_total = StrLength(CC->redirect_buffer);
 273         s.bytes_sent = 0;
 274         CC->redirect_buffer = NULL;
 275         response_code = 421;
 276
 277         for (i = 0; ((i < num_mx) && ((response_code / 100) == 4)); ++i) {      // keep trying MXes until one works or we run out
 278                 response_code = 421;    // default 421 makes non-protocol errors transient
 279                 s.bytes_sent = 0;       // rewind our buffer in case we try multiple MXes
 280
 281                 curl = curl_easy_init();
 282                 if (curl) {
 283                         response[0] = 0;
 284
 285                         if (!IsEmptyStr(envelope_from)) {
 286                                 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, envelope_from);
 287                         } else {
 288                                 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, fromaddr);
 289                         }
 290
 291                         recipients = curl_slist_append(recipients, recp);
 292                         curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
 293                         curl_easy_setopt(curl, CURLOPT_READFUNCTION, upload_source);
 294                         curl_easy_setopt(curl, CURLOPT_READDATA, &s);
 295                         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);      // tell libcurl we are uploading
 296                         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 20L);   // Time out after 20 seconds
 297                         if (CtdlGetConfigInt("c_smtpclient_disable_starttls") == 0) {
 298                                 curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_TRY);        // Attempt STARTTLS if offered
 299                         }
 300                         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
 301                         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
 302                         curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, ctdl_libcurl_smtp_debug_callback);
 303                         curl_easy_setopt(curl, CURLOPT_DEBUGDATA, (void *) response);
 304                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
 305
 306                         // Construct an SMTP URL in the form of:
 307                         //      smtp[s]://target_host/source_host
 308                         // This looks weird but libcurl uses that last part to set our name for EHLO or HELO.
 309                         // We check for "smtp://" and "smtps://" because the admin may have put those prefixes in a smart-host entry.
 310                         // If there is no prefix we add "smtp://"
 311                         extract_token(try_this_mx, mxes, i, '|', (sizeof try_this_mx - 7));
 312                         snprintf(smtp_url, sizeof smtp_url, "%s%s/%s", (((!strncasecmp(try_this_mx, HKEY("smtp://")))
 313                                                                          ||
 314                                                                          (!strncasecmp
 315                                                                           (try_this_mx,
 316                                                                            HKEY("smtps://")))) ? "" : "smtp://"),
 317                                  try_this_mx, CtdlGetConfigStr("c_fqdn")
 318                             );
 319                         curl_easy_setopt(curl, CURLOPT_URL, smtp_url);
 320                         syslog(LOG_DEBUG, "smtpclient: trying %s", smtp_url);   // send the message
 321                         res = curl_easy_perform(curl);
 322                         curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
 323                         syslog(LOG_DEBUG,
 324                                "smtpclient: libcurl returned %d (%s) , SMTP response %ld",
 325                                res, curl_easy_strerror(res), response_code);
 326
 327                         if ((res != CURLE_OK) && (response_code == 0)) {        // check for errors
 328                                 response_code = 421;
 329                         }
 330
 331                         curl_slist_free_all(recipients);
 332                         recipients = NULL;      // this gets reused; avoid double-free
 333                         curl_easy_cleanup(curl);
 334                         curl = NULL;    // this gets reused; avoid double-free
 335
 336                         /* Trim the error message buffer down to just the actual message */
 337                         trim_response(response_code, response);
 338                 }
 339         }
 340
 341         FreeStrBuf(&s.TheMessage);
 342         if (fromaddr)
 343                 free(fromaddr);
 344         return ((int) response_code);
 345 }
 346
 347
 348 /*
 349  * Process one outbound message.
 350  */
 351 void smtp_process_one_msg(long qmsgnum)
 352 {
 353         struct CtdlMessage *msg = NULL;
 354         char *instr = NULL;
 355         int i;
 356         int num_success = 0;
 357         int num_fail = 0;
 358         int num_delayed = 0;
 359         long deletes[2];
 360         int delete_this_queue = 0;
 361         char server_response[SIZ];
 362
 363         msg = CtdlFetchMessage(qmsgnum, 1);
 364         if (msg == NULL) {
 365                 syslog(LOG_WARNING, "smtpclient: %ld does not exist", qmsgnum);
 366                 return;
 367         }
 368
 369         instr = msg->cm_fields[eMesageText];
 370         msg->cm_fields[eMesageText] = NULL;
 371         CM_Free(msg);
 372
 373         // if the queue message has any CRLF's convert them to LF's
 374         char *crlf = NULL;
 375         while (crlf = strstr(instr, "\r\n"), crlf != NULL) {
 376                 strcpy(crlf, crlf + 1);
 377         }
 378
 379         // Strip out the headers and we are now left with just the instructions.
 380         char *soi = strstr(instr, "\n\n");
 381         if (soi) {
 382                 strcpy(instr, soi + 2);
 383         }
 384
 385         long msgid = 0;
 386         time_t submitted = time(NULL);
 387         time_t attempted = 0;
 388         char *bounceto = NULL;
 389         char *envelope_from = NULL;
 390
 391         char cfgline[SIZ];
 392         for (i = 0; i < num_tokens(instr, '\n'); ++i) {
 393                 extract_token(cfgline, instr, i, '\n', sizeof cfgline);
 394                 if (!strncasecmp(cfgline, HKEY("msgid|")))
 395                         msgid = atol(&cfgline[6]);
 396                 if (!strncasecmp(cfgline, HKEY("submitted|")))
 397                         submitted = atol(&cfgline[10]);
 398                 if (!strncasecmp(cfgline, HKEY("attempted|")))
 399                         attempted = atol(&cfgline[10]);
 400                 if (!strncasecmp(cfgline, HKEY("bounceto|")))
 401                         bounceto = strdup(&cfgline[9]);
 402                 if (!strncasecmp(cfgline, HKEY("envelope_from|")))
 403                         envelope_from = strdup(&cfgline[14]);
 404         }
 405
 406         int should_try_now = 0;
 407         if (attempted < submitted) {    // If no attempts have been made yet, try now
 408                 should_try_now = 1;
 409         } else if ((attempted - submitted) <= 14400) {
 410                 if ((time(NULL) - attempted) > 1800) {  // First four hours, retry every 30 minutes
 411                         should_try_now = 1;
 412                 }
 413         } else {
 414                 if ((time(NULL) - attempted) > 14400) { // After that, retry once every 4 hours
 415                         should_try_now = 1;
 416                 }
 417         }
 418
 419         if (should_try_now) {
 420                 syslog(LOG_DEBUG, "smtpclient: %ld attempting delivery now", qmsgnum);
 421                 StrBuf *NewInstr = NewStrBuf();
 422                 StrBufAppendPrintf(NewInstr, "Content-type: " SPOOLMIME "\n\n");
 423                 StrBufAppendPrintf(NewInstr, "msgid|%ld\n", msgid);
 424                 StrBufAppendPrintf(NewInstr, "submitted|%ld\n", submitted);
 425                 if (bounceto)
 426                         StrBufAppendPrintf(NewInstr, "bounceto|%s\n", bounceto);
 427                 if (envelope_from)
 428                         StrBufAppendPrintf(NewInstr, "envelope_from|%s\n", envelope_from);
 429
 430                 for (i = 0; i < num_tokens(instr, '\n'); ++i) {
 431                         extract_token(cfgline, instr, i, '\n', sizeof cfgline);
 432                         if (!strncasecmp(cfgline, HKEY("remote|"))) {
 433                                 char recp[SIZ];
 434                                 int previous_result = extract_int(cfgline, 2);
 435                                 if ((previous_result == 0)
 436                                     || (previous_result == 4)) {
 437                                         int new_result = 421;
 438                                         extract_token(recp, cfgline, 1, '|', sizeof recp);
 439                                         new_result = smtp_attempt_delivery(msgid, recp, envelope_from, server_response);
 440                                         syslog(LOG_DEBUG,
 441                                                "smtpclient: recp: <%s> , result: %d (%s)", recp, new_result, server_response);
 442                                         if ((new_result / 100) == 2) {
 443                                                 ++num_success;
 444                                         } else {
 445                                                 if ((new_result / 100) == 5) {
 446                                                         ++num_fail;
 447                                                 } else {
 448                                                         ++num_delayed;
 449                                                 }
 450                                                 StrBufAppendPrintf
 451                                                     (NewInstr,
 452                                                      "remote|%s|%ld|%ld (%s)\n",
 453                                                      recp, (new_result / 100), new_result, server_response);
 454                                         }
 455                                 }
 456                         }
 457                 }
 458
 459                 StrBufAppendPrintf(NewInstr, "attempted|%ld\n", time(NULL));
 460
 461                 // All deliveries have now been attempted.  Now determine the disposition of this queue entry.
 462
 463                 time_t age = time(NULL) - submitted;
 464                 syslog(LOG_DEBUG,
 465                        "smtpclient: submission age: %ldd%ldh%ldm%lds",
 466                        (age / 86400), ((age % 86400) / 3600), ((age % 3600) / 60), (age % 60));
 467                 syslog(LOG_DEBUG, "smtpclient: num_success=%d , num_fail=%d , num_delayed=%d", num_success, num_fail, num_delayed);
 468
 469                 // If there are permanent fails on this attempt, deliver a bounce to the user.
 470                 // The 5XX fails will be recorded in the rewritten queue, but they will be removed before the next attempt.
 471                 if (num_fail > 0) {
 472                         smtp_do_bounce(ChrPtr(NewInstr), SDB_BOUNCE_FATALS);
 473                 }
 474                 // If all deliveries have either succeeded or failed, we are finished with this queue entry.
 475                 //
 476                 if (num_delayed == 0) {
 477                         delete_this_queue = 1;
 478                 }
 479                 // If it's been more than five days, give up and tell the sender that delivery failed
 480                 //
 481                 else if ((time(NULL) - submitted) > SMTP_DELIVER_FAIL) {
 482                         smtp_do_bounce(ChrPtr(NewInstr), SDB_BOUNCE_ALL);
 483                         delete_this_queue = 1;
 484                 }
 485                 // If it's been more than four hours but less than five days, warn the sender that delivery is delayed
 486                 //
 487                 else if (((attempted - submitted) < SMTP_DELIVER_WARN)
 488                          && ((time(NULL) - submitted) >= SMTP_DELIVER_WARN)) {
 489                         smtp_do_bounce(ChrPtr(NewInstr), SDB_WARN);
 490                 }
 491
 492                 if (delete_this_queue) {
 493                         syslog(LOG_DEBUG, "smtpclient: %ld deleting", qmsgnum);
 494                         deletes[0] = qmsgnum;
 495                         deletes[1] = msgid;
 496                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, deletes, 2, "");
 497                         FreeStrBuf(&NewInstr);  // We have to free NewInstr here, no longer needed
 498                 } else {
 499                         // replace the old queue entry with the new one
 500                         syslog(LOG_DEBUG, "smtpclient: %ld rewriting", qmsgnum);
 501                         msg = convert_internet_message_buf(&NewInstr);  // This function will free NewInstr for us
 502                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM);
 503                         CM_Free(msg);
 504                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &qmsgnum, 1, "");
 505                 }
 506         } else {
 507                 syslog(LOG_DEBUG, "smtpclient: %ld retry time not reached", qmsgnum);
 508         }
 509
 510         if (bounceto != NULL)
 511                 free(bounceto);
 512         if (envelope_from != NULL)
 513                 free(envelope_from);
 514         free(instr);
 515 }
 516
 517
 518 /*
 519  * Callback for smtp_do_queue()
 520  */
 521 void smtp_add_msg(long msgnum, void *userdata)
 522 {
 523
 524         if (smtpq == NULL) {
 525                 smtpq_count = 0;
 526                 smtpq_alloc = 100;
 527                 smtpq = malloc(smtpq_alloc * sizeof(long));
 528         }
 529
 530         if (smtpq_alloc >= smtpq_count) {
 531                 smtpq_alloc += 100;
 532                 smtpq = realloc(smtpq, (smtpq_alloc * sizeof(long)));
 533         }
 534
 535         smtpq[smtpq_count++] = msgnum;
 536 }
 537
 538
 539 /*
 540  * Run through the queue sending out messages.
 541  */
 542 void smtp_do_queue(void)
 543 {
 544         int i = 0;
 545
 546         /*
 547          * This is a simple concurrency check to make sure only one smtpclient
 548          * run is done at a time.  We could do this with a mutex, but since we
 549          * don't really require extremely fine granularity here, we'll do it
 550          * with a static variable instead.
 551          */
 552         if (doing_smtpclient)
 553                 return;
 554         doing_smtpclient = 1;
 555
 556         syslog(LOG_DEBUG, "smtpclient: start queue run");
 557
 558         if (CtdlGetRoom(&CC->room, SMTP_SPOOLOUT_ROOM) != 0) {
 559                 syslog(LOG_WARNING, "Cannot find room <%s>", SMTP_SPOOLOUT_ROOM);
 560                 doing_smtpclient = 0;
 561                 return;
 562         }
 563         // Put the queue in memory so we can close the db cursor
 564         CtdlForEachMessage(MSGS_ALL, 0L, NULL, SPOOLMIME, NULL, smtp_add_msg, NULL);
 565
 566         // We are ready to run through the queue now.
 567         for (i = 0; i < smtpq_count; ++i) {
 568                 smtp_process_one_msg(smtpq[i]);
 569         }
 570
 571         smtpq_count = 0;        // don't free it, we will use this memory on the next run
 572         doing_smtpclient = 0;
 573         syslog(LOG_DEBUG, "smtpclient: end queue run");
 574 }
 575
 576
 577 /*
 578  * Module entry point
 579  */
 580 CTDL_MODULE_INIT(smtpclient)
 581 {
 582         if (!threading) {
 583                 CtdlRegisterMessageHook(smtp_aftersave, EVT_AFTERSAVE);
 584                 CtdlRegisterSessionHook(smtp_do_queue, EVT_TIMER, PRIO_AGGR + 50);
 585                 smtp_init_spoolout();
 586         }
 587
 588         /* return our module id for the log */
 589         return "smtpclient";
 590 }