citadel/modules/smtp/serv_smtpqueue.c

   1 /*
   2  * This module is an SMTP and ESMTP implementation for the Citadel system.
   3  * It is compliant with all of the following:
   4  *
   5  * RFC  821 - Simple Mail Transfer Protocol
   6  * RFC  876 - Survey of SMTP Implementations
   7  * RFC 1047 - Duplicate messages and SMTP
   8  * RFC 1652 - 8 bit MIME
   9  * RFC 1869 - Extended Simple Mail Transfer Protocol
  10  * RFC 1870 - SMTP Service Extension for Message Size Declaration
  11  * RFC 2033 - Local Mail Transfer Protocol
  12  * RFC 2197 - SMTP Service Extension for Command Pipelining
  13  * RFC 2476 - Message Submission
  14  * RFC 2487 - SMTP Service Extension for Secure SMTP over TLS
  15  * RFC 2554 - SMTP Service Extension for Authentication
  16  * RFC 2821 - Simple Mail Transfer Protocol
  17  * RFC 2822 - Internet Message Format
  18  * RFC 2920 - SMTP Service Extension for Command Pipelining
  19  *
  20  * The VRFY and EXPN commands have been removed from this implementation
  21  * because nobody uses these commands anymore, except for spammers.
  22  *
  23  * Copyright (c) 1998-2012 by the citadel.org team
  24  *
  25  *  This program is open source software; you can redistribute it and/or modify
  26  *  it under the terms of the GNU General Public License version 3.
  27  *
  28  *
  29  *
  30  *  This program is distributed in the hope that it will be useful,
  31  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  *  GNU General Public License for more details.
  34  *
  35  *
  36  *
  37  *
  38  */
  39
  40 #include "sysdep.h"
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <stdio.h>
  44 #include <termios.h>
  45 #include <fcntl.h>
  46 #include <signal.h>
  47 #include <pwd.h>
  48 #include <errno.h>
  49 #include <sys/types.h>
  50 #include <syslog.h>
  51
  52 #if TIME_WITH_SYS_TIME
  53 # include <sys/time.h>
  54 # include <time.h>
  55 #else
  56 # if HAVE_SYS_TIME_H
  57 #  include <sys/time.h>
  58 # else
  59 #  include <time.h>
  60 # endif
  61 #endif
  62 #include <sys/wait.h>
  63 #include <ctype.h>
  64 #include <string.h>
  65 #include <limits.h>
  66 #include <sys/socket.h>
  67 #include <netinet/in.h>
  68 #include <arpa/inet.h>
  69 #include <libcitadel.h>
  70 #include "citadel.h"
  71 #include "server.h"
  72 #include "citserver.h"
  73 #include "support.h"
  74 #include "config.h"
  75 #include "control.h"
  76 #include "user_ops.h"
  77 #include "database.h"
  78 #include "msgbase.h"
  79 #include "internet_addressing.h"
  80 #include "genstamp.h"
  81 #include "domain.h"
  82 #include "clientsocket.h"
  83 #include "locate_host.h"
  84 #include "citadel_dirs.h"
  85
  86 #include "ctdl_module.h"
  87
  88 #include "smtpqueue.h"
  89 #include "smtp_clienthandlers.h"
  90 #include "event_client.h"
  91
  92
  93 struct CitContext smtp_queue_CC;
  94 pthread_mutex_t ActiveQItemsLock;
  95 HashList *ActiveQItems  = NULL;
  96 HashList *QItemHandlers = NULL;
  97 const unsigned short DefaultMXPort = 25;
  98 int max_sessions_for_outbound_smtp = 500; /* how many sessions might be active till we stop adding more smtp jobs */
  99 int ndelay_count = 50; /* every n queued messages we will sleep... */
 100 int delay_msec = 5000; /* this many seconds. */
 101
 102 static const long MaxRetry = SMTP_RETRY_INTERVAL * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2;
 103 int MsgCount            = 0;
 104 int run_queue_now       = 0;    /* Set to 1 to ignore SMTP send retry times */
 105
 106 void RegisterQItemHandler(const char *Key, long Len, QItemHandler H)
 107 {
 108         QItemHandlerStruct *HS = (QItemHandlerStruct*)malloc(sizeof(QItemHandlerStruct));
 109         HS->H = H;
 110         Put(QItemHandlers, Key, Len, HS, NULL);
 111 }
 112
 113
 114
 115 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 116                               MailQEntry *MyQEntry,
 117                               StrBuf *MsgText,
 118 /* KeepMsgText allows us to use MsgText as ours. */
 119                               int KeepMsgText,
 120                               int MsgCount,
 121                               ParsedURL *RelayUrls);
 122
 123
 124 void smtp_evq_cleanup(void)
 125 {
 126
 127         pthread_mutex_lock(&ActiveQItemsLock);
 128         DeleteHash(&QItemHandlers);
 129         DeleteHash(&ActiveQItems);
 130         pthread_mutex_unlock(&ActiveQItemsLock);
 131         pthread_setspecific(MyConKey, (void *)&smtp_queue_CC);
 132 /*      citthread_mutex_destroy(&ActiveQItemsLock); TODO */
 133 }
 134
 135 int DecreaseQReference(OneQueItem *MyQItem)
 136 {
 137         int IDestructQueItem;
 138
 139         pthread_mutex_lock(&ActiveQItemsLock);
 140         MyQItem->ActiveDeliveries--;
 141         IDestructQueItem = MyQItem->ActiveDeliveries == 0;
 142         pthread_mutex_unlock(&ActiveQItemsLock);
 143         return IDestructQueItem;
 144 }
 145
 146 void DecreaseShutdownDeliveries(OneQueItem *MyQItem)
 147 {
 148         pthread_mutex_lock(&ActiveQItemsLock);
 149         MyQItem->NotYetShutdownDeliveries--;
 150         pthread_mutex_unlock(&ActiveQItemsLock);
 151 }
 152
 153 int GetShutdownDeliveries(OneQueItem *MyQItem)
 154 {
 155         int DestructNow;
 156
 157         pthread_mutex_lock(&ActiveQItemsLock);
 158         DestructNow = MyQItem->ActiveDeliveries == 0;
 159         pthread_mutex_unlock(&ActiveQItemsLock);
 160         return DestructNow;
 161 }
 162 void RemoveQItem(OneQueItem *MyQItem)
 163 {
 164         long len;
 165         const char* Key;
 166         void *VData;
 167         HashPos  *It;
 168
 169         pthread_mutex_lock(&ActiveQItemsLock);
 170         It = GetNewHashPos(ActiveQItems, 0);
 171         if (GetHashPosFromKey(ActiveQItems, LKEY(MyQItem->MessageID), It))
 172                 DeleteEntryFromHash(ActiveQItems, It);
 173         else
 174         {
 175                 SMTPC_syslog(LOG_WARNING,
 176                              "unable to find QItem with ID[%ld]",
 177                              MyQItem->MessageID);
 178                 while (GetNextHashPos(ActiveQItems, It, &len, &Key, &VData))
 179                         SMTPC_syslog(LOG_WARNING,
 180                                      "have_: ID[%ld]",
 181                                      ((OneQueItem *)VData)->MessageID);
 182         }
 183         pthread_mutex_unlock(&ActiveQItemsLock);
 184         DeleteHashPos(&It);
 185 }
 186
 187
 188 void FreeMailQEntry(void *qv)
 189 {
 190         MailQEntry *Q = qv;
 191 /*
 192         SMTPC_syslog(LOG_DEBUG, "---------------%s--------------", __FUNCTION__);
 193         cit_backtrace();
 194 */
 195         FreeStrBuf(&Q->Recipient);
 196         FreeStrBuf(&Q->StatusMessage);
 197
 198         memset(Q, 0, sizeof(MailQEntry));
 199         free(Q);
 200 }
 201 void FreeQueItem(OneQueItem **Item)
 202 {
 203 /*
 204         SMTPC_syslog(LOG_DEBUG, "---------------%s--------------", __FUNCTION__);
 205         cit_backtrace();
 206 */
 207         DeleteHash(&(*Item)->MailQEntries);
 208         FreeStrBuf(&(*Item)->EnvelopeFrom);
 209         FreeStrBuf(&(*Item)->BounceTo);
 210         FreeStrBuf(&(*Item)->SenderRoom);
 211         FreeURL(&(*Item)->URL);
 212         memset(*Item, 0, sizeof(OneQueItem));
 213         free(*Item);
 214         Item = NULL;
 215 }
 216 void HFreeQueItem(void *Item)
 217 {
 218         FreeQueItem((OneQueItem**)&Item);
 219 }
 220
 221 /* inspect recipients with a status of:
 222  * - 0 (no delivery yet attempted)
 223  * - 3/4 (transient errors
 224  *        were experienced and it's time to try again)
 225  */
 226 int CheckQEntryActive(MailQEntry *ThisItem)
 227 {
 228         if ((ThisItem->Status == 0) ||
 229             (ThisItem->Status == 3) ||
 230             (ThisItem->Status == 4))
 231         {
 232                 return 1;
 233         }
 234         else
 235                 return 0;
 236 }
 237 int CheckQEntryIsBounce(MailQEntry *ThisItem)
 238 {
 239         if ((ThisItem->Status == 3) ||
 240             (ThisItem->Status == 4) ||
 241             (ThisItem->Status == 5))
 242         {
 243                 return 1;
 244         }
 245         else
 246                 return 0;
 247 }
 248
 249 int CountActiveQueueEntries(OneQueItem *MyQItem, int before)
 250 {
 251         HashPos  *It;
 252         long len;
 253         long ActiveDeliveries;
 254         const char *Key;
 255         void *vQE;
 256
 257         ActiveDeliveries = 0;
 258         It = GetNewHashPos(MyQItem->MailQEntries, 0);
 259         while (GetNextHashPos(MyQItem->MailQEntries, It, &len, &Key, &vQE))
 260         {
 261                 int Active;
 262                 MailQEntry *ThisItem = vQE;
 263
 264                 if (CheckQEntryActive(ThisItem))
 265                 {
 266                         ActiveDeliveries++;
 267                         Active = 1;
 268                 }
 269                 else
 270                         Active = 0;
 271                 if (before)
 272                         ThisItem->Active = Active;
 273                 else
 274                         ThisItem->StillActive = Active;
 275         }
 276         DeleteHashPos(&It);
 277         return ActiveDeliveries;
 278 }
 279
 280 OneQueItem *DeserializeQueueItem(StrBuf *RawQItem, long QueMsgID)
 281 {
 282         OneQueItem *Item;
 283         const char *pLine = NULL;
 284         StrBuf *Line;
 285         StrBuf *Token;
 286         void *v;
 287
 288         Item = (OneQueItem*)malloc(sizeof(OneQueItem));
 289         memset(Item, 0, sizeof(OneQueItem));
 290         Item->Retry = SMTP_RETRY_INTERVAL;
 291         Item->MessageID = -1;
 292         Item->QueMsgID = QueMsgID;
 293
 294         Token = NewStrBuf();
 295         Line = NewStrBufPlain(NULL, 128);
 296         while (pLine != StrBufNOTNULL) {
 297                 const char *pItemPart = NULL;
 298                 void *vHandler;
 299
 300                 StrBufExtract_NextToken(Line, RawQItem, &pLine, '\n');
 301                 if (StrLength(Line) == 0) continue;
 302                 StrBufExtract_NextToken(Token, Line, &pItemPart, '|');
 303                 if (GetHash(QItemHandlers, SKEY(Token), &vHandler))
 304                 {
 305                         QItemHandlerStruct *HS;
 306                         HS = (QItemHandlerStruct*) vHandler;
 307                         HS->H(Item, Line, &pItemPart);
 308                 }
 309         }
 310         FreeStrBuf(&Line);
 311         FreeStrBuf(&Token);
 312
 313         if (Item->Retry >= MaxRetry)
 314                 Item->FailNow = 1;
 315
 316         pthread_mutex_lock(&ActiveQItemsLock);
 317         if (GetHash(ActiveQItems,
 318                     LKEY(Item->MessageID),
 319                     &v))
 320         {
 321                 /* WHOOPS. somebody else is already working on this. */
 322                 pthread_mutex_unlock(&ActiveQItemsLock);
 323                 FreeQueItem(&Item);
 324                 return NULL;
 325         }
 326         else {
 327                 /* mark our claim on this. */
 328                 Put(ActiveQItems,
 329                     LKEY(Item->MessageID),
 330                     Item,
 331                     HFreeQueItem);
 332                 pthread_mutex_unlock(&ActiveQItemsLock);
 333         }
 334
 335         return Item;
 336 }
 337
 338 StrBuf *SerializeQueueItem(OneQueItem *MyQItem)
 339 {
 340         StrBuf *QMessage;
 341         HashPos  *It;
 342         const char *Key;
 343         long len;
 344         void *vQE;
 345
 346         QMessage = NewStrBufPlain(NULL, SIZ);
 347         StrBufPrintf(QMessage, "Content-type: %s\n", SPOOLMIME);
 348 //      "attempted|%ld\n"  "retry|%ld\n",, (long)time(NULL), (long)retry );
 349         StrBufAppendBufPlain(QMessage, HKEY("\nmsgid|"), 0);
 350         StrBufAppendPrintf(QMessage, "%ld", MyQItem->MessageID);
 351
 352         StrBufAppendBufPlain(QMessage, HKEY("\nsubmitted|"), 0);
 353         StrBufAppendPrintf(QMessage, "%ld", MyQItem->Submitted);
 354
 355         if (StrLength(MyQItem->BounceTo) > 0) {
 356                 StrBufAppendBufPlain(QMessage, HKEY("\nbounceto|"), 0);
 357                 StrBufAppendBuf(QMessage, MyQItem->BounceTo, 0);
 358         }
 359
 360         if (StrLength(MyQItem->EnvelopeFrom) > 0) {
 361                 StrBufAppendBufPlain(QMessage, HKEY("\nenvelope_from|"), 0);
 362                 StrBufAppendBuf(QMessage, MyQItem->EnvelopeFrom, 0);
 363         }
 364
 365         if (StrLength(MyQItem->SenderRoom) > 0) {
 366                 StrBufAppendBufPlain(QMessage, HKEY("\nsource_room|"), 0);
 367                 StrBufAppendBuf(QMessage, MyQItem->SenderRoom, 0);
 368         }
 369
 370         StrBufAppendBufPlain(QMessage, HKEY("\nretry|"), 0);
 371         StrBufAppendPrintf(QMessage, "%ld",
 372                            MyQItem->Retry);
 373
 374         StrBufAppendBufPlain(QMessage, HKEY("\nattempted|"), 0);
 375         StrBufAppendPrintf(QMessage, "%ld",
 376                            time(NULL) /*ctdl_ev_now()*/ + MyQItem->Retry);
 377
 378         It = GetNewHashPos(MyQItem->MailQEntries, 0);
 379         while (GetNextHashPos(MyQItem->MailQEntries, It, &len, &Key, &vQE))
 380         {
 381                 MailQEntry *ThisItem = vQE;
 382
 383                 StrBufAppendBufPlain(QMessage, HKEY("\nremote|"), 0);
 384                 StrBufAppendBuf(QMessage, ThisItem->Recipient, 0);
 385                 StrBufAppendBufPlain(QMessage, HKEY("|"), 0);
 386                 StrBufAppendPrintf(QMessage, "%d", ThisItem->Status);
 387                 StrBufAppendBufPlain(QMessage, HKEY("|"), 0);
 388                 StrBufAppendBuf(QMessage, ThisItem->StatusMessage, 0);
 389         }
 390         DeleteHashPos(&It);
 391         StrBufAppendBufPlain(QMessage, HKEY("\n"), 0);
 392         return QMessage;
 393 }
 394
 395
 396
 397
 398
 399 void NewMailQEntry(OneQueItem *Item)
 400 {
 401         Item->Current = (MailQEntry*) malloc(sizeof(MailQEntry));
 402         memset(Item->Current, 0, sizeof(MailQEntry));
 403
 404         if (Item->MailQEntries == NULL)
 405                 Item->MailQEntries = NewHash(1, Flathash);
 406         /* alocate big buffer so we won't get problems reallocating later. */
 407         Item->Current->StatusMessage = NewStrBufPlain(NULL, SIZ);
 408         Item->Current->n = GetCount(Item->MailQEntries);
 409         Put(Item->MailQEntries,
 410             IKEY(Item->Current->n),
 411             Item->Current,
 412             FreeMailQEntry);
 413 }
 414
 415 void QItem_Handle_MsgID(OneQueItem *Item, StrBuf *Line, const char **Pos)
 416 {
 417         Item->MessageID = StrBufExtractNext_long(Line, Pos, '|');
 418 }
 419
 420 void QItem_Handle_EnvelopeFrom(OneQueItem *Item, StrBuf *Line, const char **Pos)
 421 {
 422         if (Item->EnvelopeFrom == NULL)
 423                 Item->EnvelopeFrom = NewStrBufPlain(NULL, StrLength(Line));
 424         StrBufExtract_NextToken(Item->EnvelopeFrom, Line, Pos, '|');
 425 }
 426
 427 void QItem_Handle_BounceTo(OneQueItem *Item, StrBuf *Line, const char **Pos)
 428 {
 429         if (Item->BounceTo == NULL)
 430                 Item->BounceTo = NewStrBufPlain(NULL, StrLength(Line));
 431         StrBufExtract_NextToken(Item->BounceTo, Line, Pos, '|');
 432 }
 433
 434 void QItem_Handle_SenderRoom(OneQueItem *Item, StrBuf *Line, const char **Pos)
 435 {
 436         if (Item->SenderRoom == NULL)
 437                 Item->SenderRoom = NewStrBufPlain(NULL, StrLength(Line));
 438         StrBufExtract_NextToken(Item->SenderRoom, Line, Pos, '|');
 439 }
 440
 441 void QItem_Handle_Recipient(OneQueItem *Item, StrBuf *Line, const char **Pos)
 442 {
 443         if (Item->Current == NULL)
 444                 NewMailQEntry(Item);
 445         if (Item->Current->Recipient == NULL)
 446                 Item->Current->Recipient=NewStrBufPlain(NULL, StrLength(Line));
 447         StrBufExtract_NextToken(Item->Current->Recipient, Line, Pos, '|');
 448         Item->Current->Status = StrBufExtractNext_int(Line, Pos, '|');
 449         StrBufExtract_NextToken(Item->Current->StatusMessage, Line, Pos, '|');
 450         Item->Current = NULL; // TODO: is this always right?
 451 }
 452
 453
 454 void QItem_Handle_retry(OneQueItem *Item, StrBuf *Line, const char **Pos)
 455 {
 456         Item->Retry =
 457                 StrBufExtractNext_int(Line, Pos, '|');
 458         if (Item->Retry == 0)
 459                 Item->Retry = SMTP_RETRY_INTERVAL;
 460         else
 461                 Item->Retry *= 2;
 462 }
 463
 464
 465 void QItem_Handle_Submitted(OneQueItem *Item, StrBuf *Line, const char **Pos)
 466 {
 467         Item->Submitted = atol(*Pos);
 468
 469 }
 470
 471 void QItem_Handle_Attempted(OneQueItem *Item, StrBuf *Line, const char **Pos)
 472 {
 473         Item->ReattemptWhen = StrBufExtractNext_int(Line, Pos, '|');
 474 }
 475
 476
 477
 478 /**
 479  * this one has to have the context for loading the message via the redirect buffer...
 480  */
 481 StrBuf *smtp_load_msg(OneQueItem *MyQItem, int n)
 482 {
 483         CitContext *CCC=CC;
 484         StrBuf *SendMsg;
 485
 486         CCC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 487         CtdlOutputMsg(MyQItem->MessageID,
 488                       MT_RFC822, HEADERS_ALL,
 489                       0, 1, NULL,
 490                       (ESC_DOT|SUPPRESS_ENV_TO) );
 491
 492         SendMsg = CCC->redirect_buffer;
 493         CCC->redirect_buffer = NULL;
 494         if ((StrLength(SendMsg) > 0) &&
 495             ChrPtr(SendMsg)[StrLength(SendMsg) - 1] != '\n') {
 496                 SMTPC_syslog(LOG_WARNING,
 497                              "[%d] Possible problem: message did not "
 498                              "correctly terminate. (expecting 0x10, got 0x%02x)\n",
 499                              MsgCount, //yes uncool, but best choice here...
 500                              ChrPtr(SendMsg)[StrLength(SendMsg) - 1] );
 501                 StrBufAppendBufPlain(SendMsg, HKEY("\r\n"), 0);
 502         }
 503         return SendMsg;
 504 }
 505
 506
 507
 508 /*
 509  * smtp_do_bounce() is caled by smtp_do_procmsg() to scan a set of delivery
 510  * instructions for "5" codes (permanent fatal errors) and produce/deliver
 511  * a "bounce" message (delivery status notification).
 512  */
 513 void smtpq_do_bounce(OneQueItem *MyQItem, StrBuf *OMsgTxt)
 514 {
 515         static int seq = 0;
 516
 517         struct CtdlMessage *bmsg = NULL;
 518         StrBuf *boundary;
 519         StrBuf *Msg = NULL;
 520         StrBuf *BounceMB;
 521         struct recptypes *valid;
 522         time_t now;
 523
 524         HashPos *It;
 525         void *vQE;
 526         long len;
 527         const char *Key;
 528
 529         int first_attempt = 0;
 530         int successful_bounce = 0;
 531         int num_bounces = 0;
 532         int give_up = 0;
 533
 534         SMTPCM_syslog(LOG_DEBUG, "smtp_do_bounce() called\n");
 535
 536         if (MyQItem->SendBounceMail == 0)
 537                 return;
 538
 539         now = time (NULL); //ev_time();
 540
 541         if ( (now - MyQItem->Submitted) > SMTP_GIVE_UP ) {
 542                 give_up = 1;
 543         }
 544
 545         if (MyQItem->Retry == SMTP_RETRY_INTERVAL) {
 546                 first_attempt = 1;
 547         }
 548
 549         /*
 550          * Now go through the instructions checking for stuff.
 551          */
 552         Msg = NewStrBufPlain(NULL, 1024);
 553         It = GetNewHashPos(MyQItem->MailQEntries, 0);
 554         while (GetNextHashPos(MyQItem->MailQEntries, It, &len, &Key, &vQE))
 555         {
 556                 MailQEntry *ThisItem = vQE;
 557                 if ((ThisItem->Active && (ThisItem->Status == 5)) || /* failed now? */
 558                     ((give_up == 1) && (ThisItem->Status != 2)) ||
 559                     ((first_attempt == 1) && (ThisItem->Status != 2)))
 560                         /* giving up after failed attempts... */
 561                 {
 562                         ++num_bounces;
 563
 564                         StrBufAppendBuf(Msg, ThisItem->Recipient, 0);
 565                         StrBufAppendBufPlain(Msg, HKEY(": "), 0);
 566                         StrBufAppendBuf(Msg, ThisItem->StatusMessage, 0);
 567                         StrBufAppendBufPlain(Msg, HKEY("\r\n"), 0);
 568                 }
 569         }
 570         DeleteHashPos(&It);
 571
 572         /* Deliver the bounce if there's anything worth mentioning */
 573         SMTPC_syslog(LOG_DEBUG, "num_bounces = %d\n", num_bounces);
 574
 575         if (num_bounces == 0) {
 576                 FreeStrBuf(&Msg);
 577                 return;
 578         }
 579
 580         boundary = NewStrBufPlain(HKEY("=_Citadel_Multipart_"));
 581         StrBufAppendPrintf(boundary,
 582                            "%s_%04x%04x",
 583                            config.c_fqdn,
 584                            getpid(),
 585                            ++seq);
 586
 587         /* Start building our bounce message; go shopping for memory first. */
 588         BounceMB = NewStrBufPlain(
 589                 NULL,
 590                 1024 + /* mime stuff.... */
 591                 StrLength(Msg) +  /* the bounce information... */
 592                 StrLength(OMsgTxt)); /* the original message */
 593         if (BounceMB == NULL) {
 594                 FreeStrBuf(&boundary);
 595                 SMTPCM_syslog(LOG_ERR, "Failed to alloc() bounce message.\n");
 596
 597                 return;
 598         }
 599
 600         bmsg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
 601         if (bmsg == NULL) {
 602                 FreeStrBuf(&boundary);
 603                 FreeStrBuf(&BounceMB);
 604                 SMTPCM_syslog(LOG_ERR, "Failed to alloc() bounce message.\n");
 605
 606                 return;
 607         }
 608         memset(bmsg, 0, sizeof(struct CtdlMessage));
 609
 610
 611         StrBufAppendBufPlain(BounceMB, HKEY("Content-type: multipart/mixed; boundary=\""), 0);
 612         StrBufAppendBuf(BounceMB, boundary, 0);
 613         StrBufAppendBufPlain(BounceMB, HKEY("\"\r\n"), 0);
 614         StrBufAppendBufPlain(BounceMB, HKEY("MIME-Version: 1.0\r\n"), 0);
 615         StrBufAppendBufPlain(BounceMB, HKEY("X-Mailer: " CITADEL "\r\n"), 0);
 616         StrBufAppendBufPlain(BounceMB, HKEY("\r\nThis is a multipart message in MIME format.\r\n\r\n"), 0);
 617         StrBufAppendBufPlain(BounceMB, HKEY("--"), 0);
 618         StrBufAppendBuf(BounceMB, boundary, 0);
 619         StrBufAppendBufPlain(BounceMB, HKEY("\r\n"), 0);
 620         StrBufAppendBufPlain(BounceMB, HKEY("Content-type: text/plain\r\n\r\n"), 0);
 621
 622         if (give_up)
 623                 StrBufAppendBufPlain(
 624                         BounceMB,
 625                         HKEY(
 626                                 "A message you sent could not be delivered "
 627                                 "to some or all of its recipients\n"
 628                                 "due to prolonged unavailability "
 629                                 "of its destination(s).\n"
 630                                 "Giving up on the following addresses:\n\n"
 631                                 ), 0);
 632         else
 633                 StrBufAppendBufPlain(
 634                         BounceMB,
 635                         HKEY(
 636                                 "A message you sent could not be delivered "
 637                                 "to some or all of its recipients.\n"
 638                                 "The following addresses "
 639                                 "were undeliverable:\n\n"
 640                                 ), 0);
 641
 642         StrBufAppendBuf(BounceMB, Msg, 0);
 643         FreeStrBuf(&Msg);
 644
 645         if (StrLength(MyQItem->SenderRoom) > 0)
 646         {
 647                 StrBufAppendBufPlain(
 648                         BounceMB,
 649                         HKEY("The message was originaly posted in: "), 0);
 650                 StrBufAppendBuf(BounceMB, MyQItem->SenderRoom, 0);
 651                 StrBufAppendBufPlain(
 652                         BounceMB,
 653                         HKEY("\n"), 0);
 654         }
 655
 656         /* Attach the original message */
 657         StrBufAppendBufPlain(BounceMB, HKEY("\r\n--"), 0);
 658         StrBufAppendBuf(BounceMB, boundary, 0);
 659         StrBufAppendBufPlain(BounceMB, HKEY("\r\n"), 0);
 660         StrBufAppendBufPlain(BounceMB,
 661                              HKEY("Content-type: message/rfc822\r\n"), 0);
 662         StrBufAppendBufPlain(BounceMB,
 663                              HKEY("Content-Transfer-Encoding: 7bit\r\n"), 0);
 664         StrBufAppendBufPlain(BounceMB,
 665                              HKEY("Content-Disposition: inline\r\n"), 0);
 666         StrBufAppendBufPlain(BounceMB, HKEY("\r\n"), 0);
 667         StrBufAppendBuf(BounceMB, OMsgTxt, 0);
 668
 669         /* Close the multipart MIME scope */
 670         StrBufAppendBufPlain(BounceMB, HKEY("--"), 0);
 671         StrBufAppendBuf(BounceMB, boundary, 0);
 672         StrBufAppendBufPlain(BounceMB, HKEY("--\r\n"), 0);
 673
 674         bmsg->cm_magic = CTDLMESSAGE_MAGIC;
 675         bmsg->cm_anon_type = MES_NORMAL;
 676         bmsg->cm_format_type = FMT_RFC822;
 677
 678         bmsg->cm_fields['O'] = strdup(MAILROOM);
 679         bmsg->cm_fields['A'] = strdup("Citadel");
 680         bmsg->cm_fields['N'] = strdup(config.c_nodename);
 681         bmsg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
 682         bmsg->cm_fields['M'] = SmashStrBuf(&BounceMB);
 683
 684         /* First try the user who sent the message */
 685         if (StrLength(MyQItem->BounceTo) == 0) {
 686                 SMTPCM_syslog(LOG_ERR, "No bounce address specified\n");
 687         }
 688         else {
 689                 SMTPC_syslog(LOG_DEBUG, "bounce to user? <%s>\n",
 690                        ChrPtr(MyQItem->BounceTo));
 691         }
 692
 693         /* Can we deliver the bounce to the original sender? */
 694         valid = validate_recipients(ChrPtr(MyQItem->BounceTo), NULL, 0);
 695         if ((valid != NULL) && (valid->num_error == 0)) {
 696                 CtdlSubmitMsg(bmsg, valid, "", QP_EADDR);
 697                 successful_bounce = 1;
 698         }
 699
 700         /* If not, post it in the Aide> room */
 701         if (successful_bounce == 0) {
 702                 CtdlSubmitMsg(bmsg, NULL, config.c_aideroom, QP_EADDR);
 703         }
 704
 705         /* Free up the memory we used */
 706         free_recipients(valid);
 707         FreeStrBuf(&boundary);
 708         CtdlFreeMessage(bmsg);
 709         SMTPCM_syslog(LOG_DEBUG, "Done processing bounces\n");
 710 }
 711
 712 /*
 713  * smtp_do_procmsg()
 714  *
 715  * Called by smtp_do_queue() to handle an individual message.
 716  */
 717 void smtp_do_procmsg(long msgnum, void *userdata) {
 718         time_t now;
 719         int mynumsessions = num_sessions;
 720         struct CtdlMessage *msg = NULL;
 721         char *instr = NULL;
 722         StrBuf *PlainQItem;
 723         OneQueItem *MyQItem;
 724         char *pch;
 725         HashPos  *It;
 726         void *vQE;
 727         long len;
 728         const char *Key;
 729         int nRelays = 0;
 730         ParsedURL *RelayUrls = NULL;
 731         int HaveBuffers = 0;
 732         StrBuf *Msg =NULL;
 733
 734         if (mynumsessions > max_sessions_for_outbound_smtp) {
 735                 SMTPC_syslog(LOG_DEBUG,
 736                              "skipping because of num jobs %d > %d max_sessions_for_outbound_smtp",
 737                              mynumsessions,
 738                              max_sessions_for_outbound_smtp);
 739         }
 740
 741         SMTPC_syslog(LOG_DEBUG, "smtp_do_procmsg(%ld)\n", msgnum);
 742         ///strcpy(envelope_from, "");
 743
 744         msg = CtdlFetchMessage(msgnum, 1);
 745         if (msg == NULL) {
 746                 SMTPC_syslog(LOG_ERR, "tried %ld but no such message!\n",
 747                        msgnum);
 748                 return;
 749         }
 750
 751         pch = instr = msg->cm_fields['M'];
 752
 753         /* Strip out the headers (no not amd any other non-instruction) line */
 754         while (pch != NULL) {
 755                 pch = strchr(pch, '\n');
 756                 if ((pch != NULL) && (*(pch + 1) == '\n')) {
 757                         instr = pch + 2;
 758                         pch = NULL;
 759                 }
 760         }
 761         PlainQItem = NewStrBufPlain(instr, -1);
 762         CtdlFreeMessage(msg);
 763         MyQItem = DeserializeQueueItem(PlainQItem, msgnum);
 764         FreeStrBuf(&PlainQItem);
 765
 766         if (MyQItem == NULL) {
 767                 SMTPC_syslog(LOG_ERR,
 768                              "Msg No %ld: already in progress!\n",
 769                              msgnum);
 770                 return; /* s.b. else is already processing... */
 771         }
 772
 773         /*
 774          * Postpone delivery if we've already tried recently.
 775          */
 776         now = time(NULL);
 777         if ((MyQItem->ReattemptWhen != 0) &&
 778             (now < MyQItem->ReattemptWhen) &&
 779             (run_queue_now == 0))
 780         {
 781                 SMTPC_syslog(LOG_DEBUG,
 782                              "Retry time not yet reached. %ld seconds left.",
 783                              MyQItem->ReattemptWhen - now);
 784
 785                 It = GetNewHashPos(MyQItem->MailQEntries, 0);
 786                 pthread_mutex_lock(&ActiveQItemsLock);
 787                 {
 788                         if (GetHashPosFromKey(ActiveQItems,
 789                                               LKEY(MyQItem->MessageID),
 790                                               It))
 791                         {
 792                                 DeleteEntryFromHash(ActiveQItems, It);
 793                         }
 794                 }
 795                 pthread_mutex_unlock(&ActiveQItemsLock);
 796                 ////FreeQueItem(&MyQItem); TODO: DeleteEntryFromHash frees this?
 797                 DeleteHashPos(&It);
 798                 return;
 799         }
 800
 801         /*
 802          * Bail out if there's no actual message associated with this
 803          */
 804         if (MyQItem->MessageID < 0L) {
 805                 SMTPCM_syslog(LOG_ERR, "no 'msgid' directive found!\n");
 806                 It = GetNewHashPos(MyQItem->MailQEntries, 0);
 807                 pthread_mutex_lock(&ActiveQItemsLock);
 808                 {
 809                         if (GetHashPosFromKey(ActiveQItems,
 810                                               LKEY(MyQItem->MessageID),
 811                                               It))
 812                         {
 813                                 DeleteEntryFromHash(ActiveQItems, It);
 814                         }
 815                 }
 816                 pthread_mutex_unlock(&ActiveQItemsLock);
 817                 DeleteHashPos(&It);
 818                 ////FreeQueItem(&MyQItem); TODO: DeleteEntryFromHash frees this?
 819                 return;
 820         }
 821
 822         {
 823                 char mxbuf[SIZ];
 824                 ParsedURL **Url = &MyQItem->URL;
 825                 nRelays = get_hosts(mxbuf, "fallbackhost");
 826                 if (nRelays > 0) {
 827                         StrBuf *All;
 828                         StrBuf *One;
 829                         const char *Pos = NULL;
 830                         All = NewStrBufPlain(mxbuf, -1);
 831                         One = NewStrBufPlain(NULL, StrLength(All) + 1);
 832
 833                         while ((Pos != StrBufNOTNULL) &&
 834                                ((Pos == NULL) ||
 835                                 !IsEmptyStr(Pos)))
 836                         {
 837                                 StrBufExtract_NextToken(One, All, &Pos, '|');
 838                                 if (!ParseURL(Url, One, DefaultMXPort)) {
 839                                         SMTPC_syslog(LOG_DEBUG,
 840                                                      "Failed to parse: %s\n",
 841                                                      ChrPtr(One));
 842                                 }
 843                                 else {
 844                                         (*Url)->IsRelay = 1;
 845                                         MyQItem->HaveRelay = 1;
 846                                 }
 847                         }
 848                         FreeStrBuf(&All);
 849                         FreeStrBuf(&One);
 850                 }
 851                 nRelays = get_hosts(mxbuf, "smarthost");
 852                 if (nRelays > 0) {
 853                         StrBuf *All;
 854                         StrBuf *One;
 855                         const char *Pos = NULL;
 856                         All = NewStrBufPlain(mxbuf, -1);
 857                         One = NewStrBufPlain(NULL, StrLength(All) + 1);
 858
 859                         while ((Pos != StrBufNOTNULL) &&
 860                                ((Pos == NULL) ||
 861                                 !IsEmptyStr(Pos)))
 862                         {
 863                                 StrBufExtract_NextToken(One, All, &Pos, '|');
 864                                 if (!ParseURL(Url, One, DefaultMXPort)) {
 865                                         SMTPC_syslog(LOG_DEBUG,
 866                                                      "Failed to parse: %s\n",
 867                                                      ChrPtr(One));
 868                                 }
 869                                 else {
 870                                         ///if (!Url->IsIP)) // todo dupe me fork ipv6
 871                                         (*Url)->IsRelay = 1;
 872                                         MyQItem->HaveRelay = 1;
 873                                 }
 874                         }
 875                         FreeStrBuf(&All);
 876                         FreeStrBuf(&One);
 877                 }
 878
 879         }
 880
 881         It = GetNewHashPos(MyQItem->MailQEntries, 0);
 882         while (GetNextHashPos(MyQItem->MailQEntries, It, &len, &Key, &vQE))
 883         {
 884                 MailQEntry *ThisItem = vQE;
 885                 SMTPC_syslog(LOG_DEBUG, "SMTP Queue: Task: <%s> %d\n",
 886                              ChrPtr(ThisItem->Recipient),
 887                              ThisItem->Active);
 888         }
 889         DeleteHashPos(&It);
 890
 891         MyQItem->NotYetShutdownDeliveries =
 892                 MyQItem->ActiveDeliveries = CountActiveQueueEntries(MyQItem, 1);
 893
 894         /* failsafe against overload:
 895          * will we exceed the limit set?
 896          */
 897         if ((MyQItem->ActiveDeliveries + mynumsessions > max_sessions_for_outbound_smtp) &&
 898             /* if yes, did we reach more than half of the quota? */
 899             ((mynumsessions * 2) > max_sessions_for_outbound_smtp) &&
 900             /* if... would we ever fit into half of the quota?? */
 901             (((MyQItem->ActiveDeliveries * 2)  < max_sessions_for_outbound_smtp)))
 902         {
 903                 /* abort delivery for another time. */
 904                 SMTPC_syslog(LOG_DEBUG,
 905                              "SMTP Queue: skipping because of num jobs %d + %ld > %d max_sessions_for_outbound_smtp",
 906                              mynumsessions,
 907                              MyQItem->ActiveDeliveries,
 908                              max_sessions_for_outbound_smtp);
 909
 910                 FreeQueItem(&MyQItem);
 911
 912                 return;
 913         }
 914
 915
 916         if (MyQItem->ActiveDeliveries > 0)
 917         {
 918                 int nActivated = 0;
 919                 int n = MsgCount++;
 920                 int m = MyQItem->ActiveDeliveries;
 921                 int i = 1;
 922                 Msg = smtp_load_msg(MyQItem, n);
 923                 It = GetNewHashPos(MyQItem->MailQEntries, 0);
 924                 while ((i <= m) &&
 925                        (GetNextHashPos(MyQItem->MailQEntries,
 926                                        It, &len, &Key, &vQE)))
 927                 {
 928                         MailQEntry *ThisItem = vQE;
 929
 930                         if (ThisItem->Active == 1)
 931                         {
 932                                 int KeepBuffers = (i == m);
 933
 934                                 nActivated++;
 935                                 if (nActivated % ndelay_count == 0)
 936                                         usleep(delay_msec);
 937
 938                                 if (i > 1) n = MsgCount++;
 939                                 syslog(LOG_DEBUG,
 940                                        "SMTPC: Trying <%ld> <%s> %d / %d \n",
 941                                        MyQItem->MessageID,
 942                                        ChrPtr(ThisItem->Recipient),
 943                                        i,
 944                                        m);
 945                                 (*((int*) userdata)) ++;
 946                                 smtp_try_one_queue_entry(MyQItem,
 947                                                          ThisItem,
 948                                                          Msg,
 949                                                          KeepBuffers,
 950                                                          n,
 951                                                          RelayUrls);
 952
 953                                 if (KeepBuffers) HaveBuffers = 1;
 954
 955                                 i++;
 956                         }
 957                 }
 958                 DeleteHashPos(&It);
 959         }
 960         else
 961         {
 962                 It = GetNewHashPos(MyQItem->MailQEntries, 0);
 963                 pthread_mutex_lock(&ActiveQItemsLock);
 964                 {
 965                         if (GetHashPosFromKey(ActiveQItems,
 966                                               LKEY(MyQItem->MessageID),
 967                                               It))
 968                         {
 969                                 DeleteEntryFromHash(ActiveQItems, It);
 970                         }
 971                         else
 972                         {
 973                                 long len;
 974                                 const char* Key;
 975                                 void *VData;
 976
 977                                 SMTPC_syslog(LOG_WARNING,
 978                                              "unable to find QItem with ID[%ld]",
 979                                              MyQItem->MessageID);
 980                                 while (GetNextHashPos(ActiveQItems,
 981                                                       It,
 982                                                       &len,
 983                                                       &Key,
 984                                                       &VData))
 985                                 {
 986                                         SMTPC_syslog(LOG_WARNING,
 987                                                      "have: ID[%ld]",
 988                                                      ((OneQueItem *)VData)->MessageID);
 989                                 }
 990                         }
 991
 992                 }
 993                 pthread_mutex_unlock(&ActiveQItemsLock);
 994                 DeleteHashPos(&It);
 995                 ////FreeQueItem(&MyQItem); TODO: DeleteEntryFromHash frees this?
 996
 997 // TODO: bounce & delete?
 998
 999         }
1000         if (!HaveBuffers) {
1001                 FreeStrBuf (&Msg);
1002 // TODO : free RelayUrls
1003         }
1004 }
1005
1006
1007
1008 /*
1009  * smtp_queue_thread()
1010  *
1011  * Run through the queue sending out messages.
1012  */
1013 void smtp_do_queue(void) {
1014         int num_processed = 0;
1015         int num_activated = 0;
1016
1017         pthread_setspecific(MyConKey, (void *)&smtp_queue_CC);
1018         SMTPCM_syslog(LOG_INFO, "processing outbound queue");
1019
1020         if (CtdlGetRoom(&CC->room, SMTP_SPOOLOUT_ROOM) != 0) {
1021                 SMTPC_syslog(LOG_ERR, "Cannot find room <%s>", SMTP_SPOOLOUT_ROOM);
1022         }
1023         else {
1024                 num_processed = CtdlForEachMessage(MSGS_ALL,
1025                                                    0L,
1026                                                    NULL,
1027                                                    SPOOLMIME,
1028                                                    NULL,
1029                                                    smtp_do_procmsg,
1030                                                    &num_activated);
1031         }
1032         SMTPC_syslog(LOG_INFO,
1033                      "queue run completed; %d messages processed %d activated",
1034                      num_processed, num_activated);
1035
1036 }
1037
1038
1039
1040 /*
1041  * Initialize the SMTP outbound queue
1042  */
1043 void smtp_init_spoolout(void) {
1044         struct ctdlroom qrbuf;
1045
1046         /*
1047          * Create the room.  This will silently fail if the room already
1048          * exists, and that's perfectly ok, because we want it to exist.
1049          */
1050         CtdlCreateRoom(SMTP_SPOOLOUT_ROOM, 3, "", 0, 1, 0, VIEW_QUEUE);
1051
1052         /*
1053          * Make sure it's set to be a "system room" so it doesn't show up
1054          * in the <K>nown rooms list for Aides.
1055          */
1056         if (CtdlGetRoomLock(&qrbuf, SMTP_SPOOLOUT_ROOM) == 0) {
1057                 qrbuf.QRflags2 |= QR2_SYSTEM;
1058                 CtdlPutRoomLock(&qrbuf);
1059         }
1060 }
1061
1062
1063
1064
1065 /*****************************************************************************/
1066 /*                          SMTP UTILITY COMMANDS                            */
1067 /*****************************************************************************/
1068
1069 void cmd_smtp(char *argbuf) {
1070         char cmd[64];
1071         char node[256];
1072         char buf[1024];
1073         int i;
1074         int num_mxhosts;
1075
1076         if (CtdlAccessCheck(ac_aide)) return;
1077
1078         extract_token(cmd, argbuf, 0, '|', sizeof cmd);
1079
1080         if (!strcasecmp(cmd, "mx")) {
1081                 extract_token(node, argbuf, 1, '|', sizeof node);
1082                 num_mxhosts = getmx(buf, node);
1083                 cprintf("%d %d MX hosts listed for %s\n",
1084                         LISTING_FOLLOWS, num_mxhosts, node);
1085                 for (i=0; i<num_mxhosts; ++i) {
1086                         extract_token(node, buf, i, '|', sizeof node);
1087                         cprintf("%s\n", node);
1088                 }
1089                 cprintf("000\n");
1090                 return;
1091         }
1092
1093         else if (!strcasecmp(cmd, "runqueue")) {
1094                 run_queue_now = 1;
1095                 cprintf("%d All outbound SMTP will be retried now.\n", CIT_OK);
1096                 return;
1097         }
1098
1099         else {
1100                 cprintf("%d Invalid command.\n", ERROR + ILLEGAL_VALUE);
1101         }
1102
1103 }
1104
1105
1106 CTDL_MODULE_INIT(smtp_queu)
1107 {
1108         char *pstr;
1109
1110         if (!threading)
1111         {
1112                 pstr = getenv("CITSERVER_n_session_max");
1113                 if ((pstr != NULL) && (*pstr != '\0'))
1114                         max_sessions_for_outbound_smtp = atol(pstr); /* how many sessions might be active till we stop adding more smtp jobs */
1115
1116                 pstr = getenv("CITSERVER_smtp_n_delay_count");
1117                 if ((pstr != NULL) && (*pstr != '\0'))
1118                         ndelay_count = atol(pstr); /* every n queued messages we will sleep... */
1119
1120                 pstr = getenv("CITSERVER_smtp_delay");
1121                 if ((pstr != NULL) && (*pstr != '\0'))
1122                         delay_msec = atol(pstr) * 1000; /* this many seconds. */
1123
1124
1125
1126
1127                 CtdlFillSystemContext(&smtp_queue_CC, "SMTP_Send");
1128                 ActiveQItems = NewHash(1, lFlathash);
1129                 pthread_mutex_init(&ActiveQItemsLock, NULL);
1130
1131                 QItemHandlers = NewHash(0, NULL);
1132
1133                 RegisterQItemHandler(HKEY("msgid"),             QItem_Handle_MsgID);
1134                 RegisterQItemHandler(HKEY("envelope_from"),     QItem_Handle_EnvelopeFrom);
1135                 RegisterQItemHandler(HKEY("retry"),             QItem_Handle_retry);
1136                 RegisterQItemHandler(HKEY("attempted"),         QItem_Handle_Attempted);
1137                 RegisterQItemHandler(HKEY("remote"),            QItem_Handle_Recipient);
1138                 RegisterQItemHandler(HKEY("bounceto"),          QItem_Handle_BounceTo);
1139                 RegisterQItemHandler(HKEY("source_room"),       QItem_Handle_SenderRoom);
1140                 RegisterQItemHandler(HKEY("submitted"),         QItem_Handle_Submitted);
1141
1142                 smtp_init_spoolout();
1143
1144                 CtdlRegisterEVCleanupHook(smtp_evq_cleanup);
1145
1146                 CtdlRegisterProtoHook(cmd_smtp, "SMTP", "SMTP utility commands");
1147                 CtdlRegisterSessionHook(smtp_do_queue, EVT_TIMER, PRIO_SEND + 10);
1148         }
1149
1150         /* return our Subversion id for the Log */
1151         return "smtpeventclient";
1152 }