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) 1997-2018 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 struct CitContext smtp_client_CC;
  62 static int doing_smtpclient = 0;
  63 long *smtpq = NULL;             // array of msgnums containing queue instructions
  64 int smtpq_count = 0;            // number of queue messages in smtpq
  65 int smtpq_alloc = 0;            // current allocation size for smtpq
  66
  67
  68 /*
  69  * Initialize the SMTP outbound queue
  70  */
  71 void smtp_init_spoolout(void)
  72 {
  73         struct ctdlroom qrbuf;
  74
  75         /*
  76          * Create the room.  This will silently fail if the room already
  77          * exists, and that's perfectly ok, because we want it to exist.
  78          */
  79         CtdlCreateRoom(SMTP_SPOOLOUT_ROOM, 3, "", 0, 1, 0, VIEW_QUEUE);
  80
  81         /*
  82          * Make sure it's set to be a "system room" so it doesn't show up
  83          * in the <K>nown rooms list for administrators.
  84          */
  85         if (CtdlGetRoomLock(&qrbuf, SMTP_SPOOLOUT_ROOM) == 0) {
  86                 qrbuf.QRflags2 |= QR2_SYSTEM;
  87                 CtdlPutRoomLock(&qrbuf);
  88         }
  89 }
  90
  91
  92 /* For internet mail, generate delivery instructions.
  93  * Yes, this is recursive.  Deal with it.  Infinite recursion does
  94  * not happen because the delivery instructions message does not
  95  * contain a recipient.
  96  */
  97 int smtp_aftersave(struct CtdlMessage *msg, recptypes * recps)
  98 {
  99         if ((recps != NULL) && (recps->num_internet > 0)) {
 100                 struct CtdlMessage *imsg = NULL;
 101                 char recipient[SIZ];
 102                 StrBuf *SpoolMsg = NewStrBuf();
 103                 long nTokens;
 104                 int i;
 105
 106                 syslog(LOG_DEBUG, "smtpclient: generating delivery instructions");
 107
 108                 StrBufPrintf(SpoolMsg,
 109                              "Content-type: " SPOOLMIME "\n"
 110                              "\n"
 111                              "msgid|%s\n"
 112                              "submitted|%ld\n" "bounceto|%s\n", msg->cm_fields[eVltMsgNum], (long) time(NULL), recps->bounce_to);
 113
 114                 if (recps->envelope_from != NULL) {
 115                         StrBufAppendBufPlain(SpoolMsg, HKEY("envelope_from|"), 0);
 116                         StrBufAppendBufPlain(SpoolMsg, recps->envelope_from, -1, 0);
 117                         StrBufAppendBufPlain(SpoolMsg, HKEY("\n"), 0);
 118                 }
 119                 if (recps->sending_room != NULL) {
 120                         StrBufAppendBufPlain(SpoolMsg, HKEY("source_room|"), 0);
 121                         StrBufAppendBufPlain(SpoolMsg, recps->sending_room, -1, 0);
 122                         StrBufAppendBufPlain(SpoolMsg, HKEY("\n"), 0);
 123                 }
 124
 125                 nTokens = num_tokens(recps->recp_internet, '|');
 126                 for (i = 0; i < nTokens; i++) {
 127                         long len;
 128                         len = extract_token(recipient, recps->recp_internet, i, '|', sizeof recipient);
 129                         if (len > 0) {
 130                                 StrBufAppendBufPlain(SpoolMsg, HKEY("remote|"), 0);
 131                                 StrBufAppendBufPlain(SpoolMsg, recipient, len, 0);
 132                                 StrBufAppendBufPlain(SpoolMsg, HKEY("|0||\n"), 0);
 133                         }
 134                 }
 135
 136                 imsg = malloc(sizeof(struct CtdlMessage));
 137                 memset(imsg, 0, sizeof(struct CtdlMessage));
 138                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 139                 imsg->cm_anon_type = MES_NORMAL;
 140                 imsg->cm_format_type = FMT_RFC822;
 141                 CM_SetField(imsg, eMsgSubject, HKEY("QMSG"));
 142                 CM_SetField(imsg, eAuthor, HKEY("Citadel"));
 143                 CM_SetField(imsg, eJournal, HKEY("do not journal"));
 144                 CM_SetAsFieldSB(imsg, eMesageText, &SpoolMsg);
 145                 CtdlSubmitMsg(imsg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 146                 CM_Free(imsg);
 147         }
 148         return 0;
 149 }
 150
 151
 152 /*
 153  * Callback for smtp_attempt_delivery() to supply libcurl with upload data.
 154  */
 155 static size_t upload_source(void *ptr, size_t size, size_t nmemb, void *userp)
 156 {
 157         struct smtpmsgsrc *s = (struct smtpmsgsrc *) userp;
 158         int sendbytes = 0;
 159         const char *send_this = NULL;
 160
 161         sendbytes = (size * nmemb);
 162
 163         if (s->bytes_sent >= s->bytes_total) {
 164                 return (0);     // no data remaining; we are done
 165         }
 166
 167         if (sendbytes > (s->bytes_total - s->bytes_sent)) {
 168                 sendbytes = s->bytes_total - s->bytes_sent;     // can't send more than we have
 169         }
 170
 171         send_this = ChrPtr(s->TheMessage);
 172         send_this += s->bytes_sent;     // start where we last left off
 173
 174         memcpy(ptr, send_this, sendbytes);
 175         s->bytes_sent += sendbytes;
 176         return (sendbytes);     // return the number of bytes _actually_ copied
 177 }
 178
 179
 180 /*
 181  * The libcurl API doesn't provide a way to capture the actual SMTP result message returned
 182  * by the remote server.  This is an ugly way to extract it, by capturing debug data from
 183  * the library and filtering on the lines we want.
 184  */
 185 int ctdl_libcurl_smtp_debug_callback(CURL * handle, curl_infotype type, char *data, size_t size, void *userptr)
 186 {
 187         if (type != CURLINFO_HEADER_IN)
 188                 return 0;
 189         if (!userptr)
 190                 return 0;
 191         char *debugbuf = (char *) userptr;
 192
 193         int len = strlen(debugbuf);
 194         if (len + size > SIZ)
 195                 return 0;
 196
 197         memcpy(&debugbuf[len], data, size);
 198         debugbuf[len + size] = 0;
 199         return 0;
 200 }
 201
 202
 203 /*
 204  * Attempt a delivery to one recipient.
 205  * Returns a three-digit SMTP status code.
 206  */
 207 int smtp_attempt_delivery(long msgid, char *recp, char *envelope_from, char *response)
 208 {
 209         struct smtpmsgsrc s;
 210         char *fromaddr = NULL;
 211         CURL *curl;
 212         CURLcode res = CURLE_OK;
 213         struct curl_slist *recipients = NULL;
 214         long response_code = 421;
 215         int num_mx = 0;
 216         char mxes[SIZ];
 217         char user[1024];
 218         char node[1024];
 219         char name[1024];
 220         char try_this_mx[256];
 221         char smtp_url[512];
 222         int i;
 223
 224         syslog(LOG_DEBUG, "smtpclient: smtp_attempt_delivery(%ld, %s)", msgid, recp);
 225
 226         process_rfc822_addr(recp, user, node, name);    // split recipient address into username, hostname, displayname
 227         num_mx = getmx(mxes, node);
 228         if (num_mx < 1) {
 229                 return (421);
 230         }
 231
 232         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 233         CtdlOutputMsg(msgid, MT_RFC822, HEADERS_ALL, 0, 1, NULL, 0, NULL, &fromaddr, NULL);
 234         s.TheMessage = CC->redirect_buffer;
 235         s.bytes_total = StrLength(CC->redirect_buffer);
 236         s.bytes_sent = 0;
 237         CC->redirect_buffer = NULL;
 238         response_code = 421;
 239
 240         for (i = 0; ((i < num_mx) && ((response_code / 100) == 4)); ++i) {      // keep trying MXes until one works or we run out
 241                 response_code = 421;    // default 421 makes non-protocol errors transient
 242                 s.bytes_sent = 0;       // rewind our buffer in case we try multiple MXes
 243
 244                 curl = curl_easy_init();
 245                 if (curl) {
 246                         response[0] = 0;
 247
 248                         if (!IsEmptyStr(envelope_from)) {
 249                                 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, envelope_from);
 250                         } else {
 251                                 curl_easy_setopt(curl, CURLOPT_MAIL_FROM, fromaddr);
 252                         }
 253
 254                         recipients = curl_slist_append(recipients, recp);
 255                         curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
 256                         curl_easy_setopt(curl, CURLOPT_READFUNCTION, upload_source);
 257                         curl_easy_setopt(curl, CURLOPT_READDATA, &s);
 258                         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);      // tell libcurl we are uploading
 259                         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 20L);   // Time out after 20 seconds
 260                         if (CtdlGetConfigInt("c_smtpclient_disable_starttls") == 0) {
 261                                 curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_TRY);        // Attempt STARTTLS if offered
 262                         }
 263                         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
 264                         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
 265                         curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, ctdl_libcurl_smtp_debug_callback);
 266                         curl_easy_setopt(curl, CURLOPT_DEBUGDATA, (void *) response);
 267                         curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
 268
 269                         // Construct an SMTP URL in the form of:
 270                         //      smtp[s]://target_host/source_host
 271                         // This looks weird but libcurl uses that last part to set our name for EHLO or HELO.
 272                         // We check for "smtp://" and "smtps://" because the admin may have put those prefixes in a smart-host entry.
 273                         // If there is no prefix we add "smtp://"
 274                         extract_token(try_this_mx, mxes, i, '|', (sizeof try_this_mx - 7));
 275                         snprintf(smtp_url, sizeof smtp_url, "%s%s/%s", (((!strncasecmp(try_this_mx, HKEY("smtp://")))
 276                                                                          ||
 277                                                                          (!strncasecmp
 278                                                                           (try_this_mx,
 279                                                                            HKEY("smtps://")))) ? "" : "smtp://"),
 280                                  try_this_mx, CtdlGetConfigStr("c_fqdn")
 281                             );
 282                         curl_easy_setopt(curl, CURLOPT_URL, smtp_url);
 283                         syslog(LOG_DEBUG, "smtpclient: trying %s", smtp_url);   // send the message
 284                         res = curl_easy_perform(curl);
 285                         curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
 286                         syslog(LOG_DEBUG,
 287                                "smtpclient: libcurl returned %d (%s) , SMTP response %ld",
 288                                res, curl_easy_strerror(res), response_code);
 289
 290                         if ((res != CURLE_OK) && (response_code == 0)) {        // check for errors
 291                                 response_code = 421;
 292                         }
 293
 294                         curl_slist_free_all(recipients);
 295                         recipients = NULL;      // this gets reused; avoid double-free
 296                         curl_easy_cleanup(curl);
 297                         curl = NULL;    // this gets reused; avoid double-free
 298
 299                         /* Trim the error message buffer down to just the actual message */
 300                         char response_code_str[4];
 301                         snprintf(response_code_str, sizeof response_code_str, "%ld", response_code);
 302                         char *respstart = strstr(response, response_code_str);
 303                         if (respstart == NULL) {
 304                                 strcpy(response, smtpstatus(response_code));
 305                         } else {
 306                                 strcpy(response, respstart);
 307                                 char *p;
 308                                 for (p = response; *p != 0; ++p) {
 309                                         if (*p == '\n')
 310                                                 *p = ' ';
 311                                         if (*p == '\r')
 312                                                 *p = ' ';
 313                                         if (!isprint(*p))
 314                                                 *p = ' ';
 315                                 }
 316                         }
 317                 }
 318         }
 319
 320         FreeStrBuf(&s.TheMessage);
 321         if (fromaddr)
 322                 free(fromaddr);
 323         return ((int) response_code);
 324 }
 325
 326
 327 /*
 328  * Process one outbound message.
 329  */
 330 void smtp_process_one_msg(long qmsgnum)
 331 {
 332         struct CtdlMessage *msg = NULL;
 333         char *instr = NULL;
 334         int i;
 335         int num_success = 0;
 336         int num_fail = 0;
 337         int num_delayed = 0;
 338         long deletes[2];
 339         int delete_this_queue = 0;
 340         char server_response[SIZ];
 341
 342         msg = CtdlFetchMessage(qmsgnum, 1, 1);
 343         if (msg == NULL) {
 344                 syslog(LOG_WARNING, "smtpclient: %ld does not exist", qmsgnum);
 345                 return;
 346         }
 347
 348         instr = msg->cm_fields[eMesageText];
 349         msg->cm_fields[eMesageText] = NULL;
 350         CM_Free(msg);
 351
 352         // if the queue message has any CRLF's convert them to LF's
 353         char *crlf = NULL;
 354         while (crlf = strstr(instr, "\r\n"), crlf != NULL) {
 355                 strcpy(crlf, crlf + 1);
 356         }
 357
 358         // Strip out the headers and we are now left with just the instructions.
 359         char *soi = strstr(instr, "\n\n");
 360         if (soi) {
 361                 strcpy(instr, soi + 2);
 362         }
 363
 364         long msgid = 0;
 365         time_t submitted = time(NULL);
 366         time_t attempted = 0;
 367         char *bounceto = NULL;
 368         char *envelope_from = NULL;
 369
 370         char cfgline[SIZ];
 371         for (i = 0; i < num_tokens(instr, '\n'); ++i) {
 372                 extract_token(cfgline, instr, i, '\n', sizeof cfgline);
 373                 if (!strncasecmp(cfgline, HKEY("msgid|")))
 374                         msgid = atol(&cfgline[6]);
 375                 if (!strncasecmp(cfgline, HKEY("submitted|")))
 376                         submitted = atol(&cfgline[10]);
 377                 if (!strncasecmp(cfgline, HKEY("attempted|")))
 378                         attempted = atol(&cfgline[10]);
 379                 if (!strncasecmp(cfgline, HKEY("bounceto|")))
 380                         bounceto = strdup(&cfgline[9]);
 381                 if (!strncasecmp(cfgline, HKEY("envelope_from|")))
 382                         envelope_from = strdup(&cfgline[14]);
 383         }
 384
 385         int should_try_now = 0;
 386         if (attempted < submitted) {    // If no attempts have been made yet, try now
 387                 should_try_now = 1;
 388         } else if ((attempted - submitted) <= 14400) {
 389                 if ((time(NULL) - attempted) > 1800) {  // First four hours, retry every 30 minutes
 390                         should_try_now = 1;
 391                 }
 392         } else {
 393                 if ((time(NULL) - attempted) > 14400) { // After that, retry once every 4 hours
 394                         should_try_now = 1;
 395                 }
 396         }
 397
 398         if (should_try_now) {
 399                 syslog(LOG_DEBUG, "smtpclient: %ld attempting delivery now", qmsgnum);
 400                 StrBuf *NewInstr = NewStrBuf();
 401                 StrBufAppendPrintf(NewInstr, "Content-type: " SPOOLMIME "\n\n");
 402                 StrBufAppendPrintf(NewInstr, "msgid|%ld\n", msgid);
 403                 StrBufAppendPrintf(NewInstr, "submitted|%ld\n", submitted);
 404                 if (bounceto)
 405                         StrBufAppendPrintf(NewInstr, "bounceto|%s\n", bounceto);
 406                 if (envelope_from)
 407                         StrBufAppendPrintf(NewInstr, "envelope_from|%s\n", envelope_from);
 408
 409                 for (i = 0; i < num_tokens(instr, '\n'); ++i) {
 410                         extract_token(cfgline, instr, i, '\n', sizeof cfgline);
 411                         if (!strncasecmp(cfgline, HKEY("remote|"))) {
 412                                 char recp[SIZ];
 413                                 int previous_result = extract_int(cfgline, 2);
 414                                 if ((previous_result == 0)
 415                                     || (previous_result == 4)) {
 416                                         int new_result = 421;
 417                                         extract_token(recp, cfgline, 1, '|', sizeof recp);
 418                                         new_result = smtp_attempt_delivery(msgid, recp, envelope_from, server_response);
 419                                         syslog(LOG_DEBUG,
 420                                                "smtpclient: recp: <%s> , result: %d (%s)", recp, new_result, server_response);
 421                                         if ((new_result / 100) == 2) {
 422                                                 ++num_success;
 423                                         } else {
 424                                                 if ((new_result / 100) == 5) {
 425                                                         ++num_fail;
 426                                                 } else {
 427                                                         ++num_delayed;
 428                                                 }
 429                                                 StrBufAppendPrintf
 430                                                     (NewInstr,
 431                                                      "remote|%s|%ld|%ld (%s)\n",
 432                                                      recp, (new_result / 100), new_result, server_response);
 433                                         }
 434                                 }
 435                         }
 436                 }
 437
 438                 StrBufAppendPrintf(NewInstr, "attempted|%ld\n", time(NULL));
 439
 440                 // All deliveries have now been attempted.  Now determine the disposition of this queue entry.
 441
 442                 time_t age = time(NULL) - submitted;
 443                 syslog(LOG_DEBUG,
 444                        "smtpclient: submission age: %ldd%ldh%ldm%lds",
 445                        (age / 86400), ((age % 86400) / 3600), ((age % 3600) / 60), (age % 60));
 446                 syslog(LOG_DEBUG, "smtpclient: num_success=%d , num_fail=%d , num_delayed=%d", num_success, num_fail, num_delayed);
 447
 448                 // If there are permanent fails on this attempt, deliver a bounce to the user.
 449                 // The 5XX fails will be recorded in the rewritten queue, but they will be removed before the next attempt.
 450                 if (num_fail > 0) {
 451                         smtp_do_bounce(ChrPtr(NewInstr), SDB_BOUNCE_FATALS);
 452                 }
 453                 // If all deliveries have either succeeded or failed, we are finished with this queue entry.
 454                 //
 455                 if (num_delayed == 0) {
 456                         delete_this_queue = 1;
 457                 }
 458                 // If it's been more than five days, give up and tell the sender that delivery failed
 459                 //
 460                 else if ((time(NULL) - submitted) > SMTP_DELIVER_FAIL) {
 461                         smtp_do_bounce(ChrPtr(NewInstr), SDB_BOUNCE_ALL);
 462                         delete_this_queue = 1;
 463                 }
 464                 // If it's been more than four hours but less than five days, warn the sender that delivery is delayed
 465                 //
 466                 else if (((attempted - submitted) < SMTP_DELIVER_WARN)
 467                          && ((time(NULL) - submitted) >= SMTP_DELIVER_WARN)) {
 468                         smtp_do_bounce(ChrPtr(NewInstr), SDB_WARN);
 469                 }
 470
 471                 if (delete_this_queue) {
 472                         syslog(LOG_DEBUG, "smtpclient: %ld deleting", qmsgnum);
 473                         deletes[0] = qmsgnum;
 474                         deletes[1] = msgid;
 475                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, deletes, 2, "");
 476                         FreeStrBuf(&NewInstr);  // We have to free NewInstr here, no longer needed
 477                 } else {
 478                         // replace the old queue entry with the new one
 479                         syslog(LOG_DEBUG, "smtpclient: %ld rewriting", qmsgnum);
 480                         msg = convert_internet_message_buf(&NewInstr);  // This function will free NewInstr for us
 481                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, 0);
 482                         CM_Free(msg);
 483                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &qmsgnum, 1, "");
 484                 }
 485         } else {
 486                 syslog(LOG_DEBUG, "smtpclient: %ld retry time not reached", qmsgnum);
 487         }
 488
 489         if (bounceto != NULL)
 490                 free(bounceto);
 491         if (envelope_from != NULL)
 492                 free(envelope_from);
 493         free(instr);
 494 }
 495
 496
 497 /*
 498  * Callback for smtp_do_queue()
 499  */
 500 void smtp_add_msg(long msgnum, void *userdata)
 501 {
 502
 503         if (smtpq == NULL) {
 504                 smtpq_count = 0;
 505                 smtpq_alloc = 100;
 506                 smtpq = malloc(smtpq_alloc * sizeof(long));
 507         }
 508
 509         if (smtpq_alloc >= smtpq_count) {
 510                 smtpq_alloc += 100;
 511                 smtpq = realloc(smtpq, (smtpq_alloc * sizeof(long)));
 512         }
 513
 514         smtpq[smtpq_count++] = msgnum;
 515 }
 516
 517
 518 /*
 519  * Run through the queue sending out messages.
 520  */
 521 void smtp_do_queue(void)
 522 {
 523         int i = 0;
 524
 525         /*
 526          * This is a simple concurrency check to make sure only one smtpclient
 527          * run is done at a time.  We could do this with a mutex, but since we
 528          * don't really require extremely fine granularity here, we'll do it
 529          * with a static variable instead.
 530          */
 531         if (doing_smtpclient)
 532                 return;
 533         doing_smtpclient = 1;
 534
 535         syslog(LOG_DEBUG, "smtpclient: start queue run");
 536         pthread_setspecific(MyConKey, (void *) &smtp_client_CC);
 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                 CtdlFillSystemContext(&smtp_client_CC, "SMTP_Send");
 564                 CtdlRegisterMessageHook(smtp_aftersave, EVT_AFTERSAVE);
 565                 CtdlRegisterSessionHook(smtp_do_queue, EVT_TIMER, PRIO_AGGR + 50);
 566                 smtp_init_spoolout();
 567         }
 568
 569         /* return our module id for the log */
 570         return "smtpclient";
 571 }