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, ParsedURL *Relay)
 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                         StrBufAppendBufPlain(Msg, HKEY(" "), 0);
 565                         StrBufAppendBuf(Msg, ThisItem->Recipient, 0);
 566                         StrBufAppendBufPlain(Msg, HKEY(": "), 0);
 567                         StrBufAppendBuf(Msg, ThisItem->StatusMessage, 0);
 568                         StrBufAppendBufPlain(Msg, HKEY("\r\n"), 0);
 569                 }
 570         }
 571         DeleteHashPos(&It);
 572
 573         /* Deliver the bounce if there's anything worth mentioning */
 574         SMTPC_syslog(LOG_DEBUG, "num_bounces = %d\n", num_bounces);
 575
 576         if (num_bounces == 0) {
 577                 FreeStrBuf(&Msg);
 578                 return;
 579         }
 580
 581         if ((StrLength(MyQItem->SenderRoom) == 0) && MyQItem->HaveRelay) {
 582                 /* one message that relaying is broken is enough; no extra room error message. */
 583                 StrBuf *RelayDetails = NewStrBuf();
 584
 585                 StrBufPrintf(RelayDetails,
 586                              "Relaying via %s failed permanently. \n Reason:\n%s\n Revalidate your relay configuration.",
 587                              ChrPtr(Relay->URL),
 588                              ChrPtr(Msg));
 589                 CtdlAideMessage(ChrPtr(RelayDetails), "Relaying Failed");
 590                 FreeStrBuf(&RelayDetails);
 591         }
 592
 593         boundary = NewStrBufPlain(HKEY("=_Citadel_Multipart_"));
 594         StrBufAppendPrintf(boundary,
 595                            "%s_%04x%04x",
 596                            config.c_fqdn,
 597                            getpid(),
 598                            ++seq);
 599
 600         /* Start building our bounce message; go shopping for memory first. */
 601         BounceMB = NewStrBufPlain(
 602                 NULL,
 603                 1024 + /* mime stuff.... */
 604                 StrLength(Msg) +  /* the bounce information... */
 605                 StrLength(OMsgTxt)); /* the original message */
 606         if (BounceMB == NULL) {
 607                 FreeStrBuf(&boundary);
 608                 SMTPCM_syslog(LOG_ERR, "Failed to alloc() bounce message.\n");
 609
 610                 return;
 611         }
 612
 613         bmsg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
 614         if (bmsg == NULL) {
 615                 FreeStrBuf(&boundary);
 616                 FreeStrBuf(&BounceMB);
 617                 SMTPCM_syslog(LOG_ERR, "Failed to alloc() bounce message.\n");
 618
 619                 return;
 620         }
 621         memset(bmsg, 0, sizeof(struct CtdlMessage));
 622
 623
 624         StrBufAppendBufPlain(BounceMB, HKEY("Content-type: multipart/mixed; boundary=\""), 0);
 625         StrBufAppendBuf(BounceMB, boundary, 0);
 626         StrBufAppendBufPlain(BounceMB, HKEY("\"\r\n"), 0);
 627         StrBufAppendBufPlain(BounceMB, HKEY("MIME-Version: 1.0\r\n"), 0);
 628         StrBufAppendBufPlain(BounceMB, HKEY("X-Mailer: " CITADEL "\r\n"), 0);
 629         StrBufAppendBufPlain(BounceMB, HKEY("\r\nThis is a multipart message in MIME format.\r\n\r\n"), 0);
 630         StrBufAppendBufPlain(BounceMB, HKEY("--"), 0);
 631         StrBufAppendBuf(BounceMB, boundary, 0);
 632         StrBufAppendBufPlain(BounceMB, HKEY("\r\n"), 0);
 633         StrBufAppendBufPlain(BounceMB, HKEY("Content-type: text/plain\r\n\r\n"), 0);
 634
 635         if (give_up)
 636                 StrBufAppendBufPlain(
 637                         BounceMB,
 638                         HKEY(
 639                                 "A message you sent could not be delivered "
 640                                 "to some or all of its recipients\n"
 641                                 "due to prolonged unavailability "
 642                                 "of its destination(s).\n"
 643                                 "Giving up on the following addresses:\n\n"
 644                                 ), 0);
 645         else
 646                 StrBufAppendBufPlain(
 647                         BounceMB,
 648                         HKEY(
 649                                 "A message you sent could not be delivered "
 650                                 "to some or all of its recipients.\n"
 651                                 "The following addresses "
 652                                 "were undeliverable:\n\n"
 653                                 ), 0);
 654
 655         StrBufAppendBuf(BounceMB, Msg, 0);
 656         FreeStrBuf(&Msg);
 657
 658         if (StrLength(MyQItem->SenderRoom) > 0)
 659         {
 660                 StrBufAppendBufPlain(
 661                         BounceMB,
 662                         HKEY("The message was originaly posted in: "), 0);
 663                 StrBufAppendBuf(BounceMB, MyQItem->SenderRoom, 0);
 664                 StrBufAppendBufPlain(
 665                         BounceMB,
 666                         HKEY("\n"), 0);
 667         }
 668
 669         /* Attach the original message */
 670         StrBufAppendBufPlain(BounceMB, HKEY("\r\n--"), 0);
 671         StrBufAppendBuf(BounceMB, boundary, 0);
 672         StrBufAppendBufPlain(BounceMB, HKEY("\r\n"), 0);
 673         StrBufAppendBufPlain(BounceMB,
 674                              HKEY("Content-type: message/rfc822\r\n"), 0);
 675         StrBufAppendBufPlain(BounceMB,
 676                              HKEY("Content-Transfer-Encoding: 7bit\r\n"), 0);
 677         StrBufAppendBufPlain(BounceMB,
 678                              HKEY("Content-Disposition: inline\r\n"), 0);
 679         StrBufAppendBufPlain(BounceMB, HKEY("\r\n"), 0);
 680         StrBufAppendBuf(BounceMB, OMsgTxt, 0);
 681
 682         /* Close the multipart MIME scope */
 683         StrBufAppendBufPlain(BounceMB, HKEY("--"), 0);
 684         StrBufAppendBuf(BounceMB, boundary, 0);
 685         StrBufAppendBufPlain(BounceMB, HKEY("--\r\n"), 0);
 686
 687         bmsg->cm_magic = CTDLMESSAGE_MAGIC;
 688         bmsg->cm_anon_type = MES_NORMAL;
 689         bmsg->cm_format_type = FMT_RFC822;
 690
 691         bmsg->cm_fields['O'] = strdup(MAILROOM);
 692         bmsg->cm_fields['A'] = strdup("Citadel");
 693         bmsg->cm_fields['N'] = strdup(config.c_nodename);
 694         bmsg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
 695         bmsg->cm_fields['M'] = SmashStrBuf(&BounceMB);
 696
 697         /* First try the user who sent the message */
 698         if (StrLength(MyQItem->BounceTo) == 0) {
 699                 SMTPCM_syslog(LOG_ERR, "No bounce address specified\n");
 700         }
 701         else {
 702                 SMTPC_syslog(LOG_DEBUG, "bounce to user? <%s>\n",
 703                        ChrPtr(MyQItem->BounceTo));
 704         }
 705
 706         /* Can we deliver the bounce to the original sender? */
 707         valid = validate_recipients(ChrPtr(MyQItem->BounceTo), NULL, 0);
 708         if ((valid != NULL) && (valid->num_error == 0)) {
 709                 CtdlSubmitMsg(bmsg, valid, "", QP_EADDR);
 710                 successful_bounce = 1;
 711         }
 712
 713         /* If not, post it in the Aide> room */
 714         if (successful_bounce == 0) {
 715                 CtdlSubmitMsg(bmsg, NULL, config.c_aideroom, QP_EADDR);
 716         }
 717
 718         /* Free up the memory we used */
 719         free_recipients(valid);
 720         FreeStrBuf(&boundary);
 721         CtdlFreeMessage(bmsg);
 722         SMTPCM_syslog(LOG_DEBUG, "Done processing bounces\n");
 723 }
 724
 725 /*
 726  * smtp_do_procmsg()
 727  *
 728  * Called by smtp_do_queue() to handle an individual message.
 729  */
 730 void smtp_do_procmsg(long msgnum, void *userdata) {
 731         time_t now;
 732         int mynumsessions = num_sessions;
 733         struct CtdlMessage *msg = NULL;
 734         char *instr = NULL;
 735         StrBuf *PlainQItem;
 736         OneQueItem *MyQItem;
 737         char *pch;
 738         HashPos  *It;
 739         void *vQE;
 740         long len;
 741         const char *Key;
 742         int nRelays = 0;
 743         ParsedURL *RelayUrls = NULL;
 744         int HaveBuffers = 0;
 745         StrBuf *Msg =NULL;
 746
 747         if (mynumsessions > max_sessions_for_outbound_smtp) {
 748                 SMTPC_syslog(LOG_DEBUG,
 749                              "skipping because of num jobs %d > %d max_sessions_for_outbound_smtp",
 750                              mynumsessions,
 751                              max_sessions_for_outbound_smtp);
 752         }
 753
 754         SMTPC_syslog(LOG_DEBUG, "smtp_do_procmsg(%ld)\n", msgnum);
 755         ///strcpy(envelope_from, "");
 756
 757         msg = CtdlFetchMessage(msgnum, 1);
 758         if (msg == NULL) {
 759                 SMTPC_syslog(LOG_ERR, "tried %ld but no such message!\n",
 760                        msgnum);
 761                 return;
 762         }
 763
 764         pch = instr = msg->cm_fields['M'];
 765
 766         /* Strip out the headers (no not amd any other non-instruction) line */
 767         while (pch != NULL) {
 768                 pch = strchr(pch, '\n');
 769                 if ((pch != NULL) && (*(pch + 1) == '\n')) {
 770                         instr = pch + 2;
 771                         pch = NULL;
 772                 }
 773         }
 774         PlainQItem = NewStrBufPlain(instr, -1);
 775         CtdlFreeMessage(msg);
 776         MyQItem = DeserializeQueueItem(PlainQItem, msgnum);
 777         FreeStrBuf(&PlainQItem);
 778
 779         if (MyQItem == NULL) {
 780                 SMTPC_syslog(LOG_ERR,
 781                              "Msg No %ld: already in progress!\n",
 782                              msgnum);
 783                 return; /* s.b. else is already processing... */
 784         }
 785
 786         /*
 787          * Postpone delivery if we've already tried recently.
 788          */
 789         now = time(NULL);
 790         if ((MyQItem->ReattemptWhen != 0) &&
 791             (now < MyQItem->ReattemptWhen) &&
 792             (run_queue_now == 0))
 793         {
 794                 SMTPC_syslog(LOG_DEBUG,
 795                              "Retry time not yet reached. %ld seconds left.",
 796                              MyQItem->ReattemptWhen - now);
 797
 798                 It = GetNewHashPos(MyQItem->MailQEntries, 0);
 799                 pthread_mutex_lock(&ActiveQItemsLock);
 800                 {
 801                         if (GetHashPosFromKey(ActiveQItems,
 802                                               LKEY(MyQItem->MessageID),
 803                                               It))
 804                         {
 805                                 DeleteEntryFromHash(ActiveQItems, It);
 806                         }
 807                 }
 808                 pthread_mutex_unlock(&ActiveQItemsLock);
 809                 ////FreeQueItem(&MyQItem); TODO: DeleteEntryFromHash frees this?
 810                 DeleteHashPos(&It);
 811                 return;
 812         }
 813
 814         /*
 815          * Bail out if there's no actual message associated with this
 816          */
 817         if (MyQItem->MessageID < 0L) {
 818                 SMTPCM_syslog(LOG_ERR, "no 'msgid' directive found!\n");
 819                 It = GetNewHashPos(MyQItem->MailQEntries, 0);
 820                 pthread_mutex_lock(&ActiveQItemsLock);
 821                 {
 822                         if (GetHashPosFromKey(ActiveQItems,
 823                                               LKEY(MyQItem->MessageID),
 824                                               It))
 825                         {
 826                                 DeleteEntryFromHash(ActiveQItems, It);
 827                         }
 828                 }
 829                 pthread_mutex_unlock(&ActiveQItemsLock);
 830                 DeleteHashPos(&It);
 831                 ////FreeQueItem(&MyQItem); TODO: DeleteEntryFromHash frees this?
 832                 return;
 833         }
 834
 835         {
 836                 char mxbuf[SIZ];
 837                 ParsedURL **Url = &MyQItem->URL;
 838                 nRelays = get_hosts(mxbuf, "fallbackhost");
 839                 if (nRelays > 0) {
 840                         StrBuf *All;
 841                         StrBuf *One;
 842                         const char *Pos = NULL;
 843                         All = NewStrBufPlain(mxbuf, -1);
 844                         One = NewStrBufPlain(NULL, StrLength(All) + 1);
 845
 846                         while ((Pos != StrBufNOTNULL) &&
 847                                ((Pos == NULL) ||
 848                                 !IsEmptyStr(Pos)))
 849                         {
 850                                 StrBufExtract_NextToken(One, All, &Pos, '|');
 851                                 if (!ParseURL(Url, One, DefaultMXPort)) {
 852                                         SMTPC_syslog(LOG_DEBUG,
 853                                                      "Failed to parse: %s\n",
 854                                                      ChrPtr(One));
 855                                 }
 856                                 else {
 857                                         (*Url)->IsRelay = 1;
 858                                         MyQItem->HaveRelay = 1;
 859                                 }
 860                         }
 861                         FreeStrBuf(&All);
 862                         FreeStrBuf(&One);
 863                 }
 864                 nRelays = get_hosts(mxbuf, "smarthost");
 865                 if (nRelays > 0) {
 866                         StrBuf *All;
 867                         StrBuf *One;
 868                         const char *Pos = NULL;
 869                         All = NewStrBufPlain(mxbuf, -1);
 870                         One = NewStrBufPlain(NULL, StrLength(All) + 1);
 871
 872                         while ((Pos != StrBufNOTNULL) &&
 873                                ((Pos == NULL) ||
 874                                 !IsEmptyStr(Pos)))
 875                         {
 876                                 StrBufExtract_NextToken(One, All, &Pos, '|');
 877                                 if (!ParseURL(Url, One, DefaultMXPort)) {
 878                                         SMTPC_syslog(LOG_DEBUG,
 879                                                      "Failed to parse: %s\n",
 880                                                      ChrPtr(One));
 881                                 }
 882                                 else {
 883                                         ///if (!Url->IsIP)) // todo dupe me fork ipv6
 884                                         (*Url)->IsRelay = 1;
 885                                         MyQItem->HaveRelay = 1;
 886                                 }
 887                         }
 888                         FreeStrBuf(&All);
 889                         FreeStrBuf(&One);
 890                 }
 891
 892         }
 893
 894         It = GetNewHashPos(MyQItem->MailQEntries, 0);
 895         while (GetNextHashPos(MyQItem->MailQEntries, It, &len, &Key, &vQE))
 896         {
 897                 MailQEntry *ThisItem = vQE;
 898                 SMTPC_syslog(LOG_DEBUG, "SMTP Queue: Task: <%s> %d\n",
 899                              ChrPtr(ThisItem->Recipient),
 900                              ThisItem->Active);
 901         }
 902         DeleteHashPos(&It);
 903
 904         MyQItem->NotYetShutdownDeliveries =
 905                 MyQItem->ActiveDeliveries = CountActiveQueueEntries(MyQItem, 1);
 906
 907         /* failsafe against overload:
 908          * will we exceed the limit set?
 909          */
 910         if ((MyQItem->ActiveDeliveries + mynumsessions > max_sessions_for_outbound_smtp) &&
 911             /* if yes, did we reach more than half of the quota? */
 912             ((mynumsessions * 2) > max_sessions_for_outbound_smtp) &&
 913             /* if... would we ever fit into half of the quota?? */
 914             (((MyQItem->ActiveDeliveries * 2)  < max_sessions_for_outbound_smtp)))
 915         {
 916                 /* abort delivery for another time. */
 917                 SMTPC_syslog(LOG_DEBUG,
 918                              "SMTP Queue: skipping because of num jobs %d + %ld > %d max_sessions_for_outbound_smtp",
 919                              mynumsessions,
 920                              MyQItem->ActiveDeliveries,
 921                              max_sessions_for_outbound_smtp);
 922
 923                 FreeQueItem(&MyQItem);
 924
 925                 return;
 926         }
 927
 928
 929         if (MyQItem->ActiveDeliveries > 0)
 930         {
 931                 int nActivated = 0;
 932                 int n = MsgCount++;
 933                 int m = MyQItem->ActiveDeliveries;
 934                 int i = 1;
 935                 Msg = smtp_load_msg(MyQItem, n);
 936                 It = GetNewHashPos(MyQItem->MailQEntries, 0);
 937                 while ((i <= m) &&
 938                        (GetNextHashPos(MyQItem->MailQEntries,
 939                                        It, &len, &Key, &vQE)))
 940                 {
 941                         MailQEntry *ThisItem = vQE;
 942
 943                         if (ThisItem->Active == 1)
 944                         {
 945                                 int KeepBuffers = (i == m);
 946
 947                                 nActivated++;
 948                                 if (nActivated % ndelay_count == 0)
 949                                         usleep(delay_msec);
 950
 951                                 if (i > 1) n = MsgCount++;
 952                                 syslog(LOG_DEBUG,
 953                                        "SMTPC: Trying <%ld> <%s> %d / %d \n",
 954                                        MyQItem->MessageID,
 955                                        ChrPtr(ThisItem->Recipient),
 956                                        i,
 957                                        m);
 958                                 (*((int*) userdata)) ++;
 959                                 smtp_try_one_queue_entry(MyQItem,
 960                                                          ThisItem,
 961                                                          Msg,
 962                                                          KeepBuffers,
 963                                                          n,
 964                                                          RelayUrls);
 965
 966                                 if (KeepBuffers) HaveBuffers = 1;
 967
 968                                 i++;
 969                         }
 970                 }
 971                 DeleteHashPos(&It);
 972         }
 973         else
 974         {
 975                 It = GetNewHashPos(MyQItem->MailQEntries, 0);
 976                 pthread_mutex_lock(&ActiveQItemsLock);
 977                 {
 978                         if (GetHashPosFromKey(ActiveQItems,
 979                                               LKEY(MyQItem->MessageID),
 980                                               It))
 981                         {
 982                                 DeleteEntryFromHash(ActiveQItems, It);
 983                         }
 984                         else
 985                         {
 986                                 long len;
 987                                 const char* Key;
 988                                 void *VData;
 989
 990                                 SMTPC_syslog(LOG_WARNING,
 991                                              "unable to find QItem with ID[%ld]",
 992                                              MyQItem->MessageID);
 993                                 while (GetNextHashPos(ActiveQItems,
 994                                                       It,
 995                                                       &len,
 996                                                       &Key,
 997                                                       &VData))
 998                                 {
 999                                         SMTPC_syslog(LOG_WARNING,
1000                                                      "have: ID[%ld]",
1001                                                      ((OneQueItem *)VData)->MessageID);
1002                                 }
1003                         }
1004
1005                 }
1006                 pthread_mutex_unlock(&ActiveQItemsLock);
1007                 DeleteHashPos(&It);
1008                 ////FreeQueItem(&MyQItem); TODO: DeleteEntryFromHash frees this?
1009
1010 // TODO: bounce & delete?
1011
1012         }
1013         if (!HaveBuffers) {
1014                 FreeStrBuf (&Msg);
1015 // TODO : free RelayUrls
1016         }
1017 }
1018
1019
1020
1021 /*
1022  * smtp_queue_thread()
1023  *
1024  * Run through the queue sending out messages.
1025  */
1026 void smtp_do_queue(void) {
1027         int num_processed = 0;
1028         int num_activated = 0;
1029
1030         pthread_setspecific(MyConKey, (void *)&smtp_queue_CC);
1031         SMTPCM_syslog(LOG_INFO, "processing outbound queue");
1032
1033         if (CtdlGetRoom(&CC->room, SMTP_SPOOLOUT_ROOM) != 0) {
1034                 SMTPC_syslog(LOG_ERR, "Cannot find room <%s>", SMTP_SPOOLOUT_ROOM);
1035         }
1036         else {
1037                 num_processed = CtdlForEachMessage(MSGS_ALL,
1038                                                    0L,
1039                                                    NULL,
1040                                                    SPOOLMIME,
1041                                                    NULL,
1042                                                    smtp_do_procmsg,
1043                                                    &num_activated);
1044         }
1045         SMTPC_syslog(LOG_INFO,
1046                      "queue run completed; %d messages processed %d activated",
1047                      num_processed, num_activated);
1048
1049 }
1050
1051
1052
1053 /*
1054  * Initialize the SMTP outbound queue
1055  */
1056 void smtp_init_spoolout(void) {
1057         struct ctdlroom qrbuf;
1058
1059         /*
1060          * Create the room.  This will silently fail if the room already
1061          * exists, and that's perfectly ok, because we want it to exist.
1062          */
1063         CtdlCreateRoom(SMTP_SPOOLOUT_ROOM, 3, "", 0, 1, 0, VIEW_QUEUE);
1064
1065         /*
1066          * Make sure it's set to be a "system room" so it doesn't show up
1067          * in the <K>nown rooms list for Aides.
1068          */
1069         if (CtdlGetRoomLock(&qrbuf, SMTP_SPOOLOUT_ROOM) == 0) {
1070                 qrbuf.QRflags2 |= QR2_SYSTEM;
1071                 CtdlPutRoomLock(&qrbuf);
1072         }
1073 }
1074
1075
1076
1077
1078 /*****************************************************************************/
1079 /*                          SMTP UTILITY COMMANDS                            */
1080 /*****************************************************************************/
1081
1082 void cmd_smtp(char *argbuf) {
1083         char cmd[64];
1084         char node[256];
1085         char buf[1024];
1086         int i;
1087         int num_mxhosts;
1088
1089         if (CtdlAccessCheck(ac_aide)) return;
1090
1091         extract_token(cmd, argbuf, 0, '|', sizeof cmd);
1092
1093         if (!strcasecmp(cmd, "mx")) {
1094                 extract_token(node, argbuf, 1, '|', sizeof node);
1095                 num_mxhosts = getmx(buf, node);
1096                 cprintf("%d %d MX hosts listed for %s\n",
1097                         LISTING_FOLLOWS, num_mxhosts, node);
1098                 for (i=0; i<num_mxhosts; ++i) {
1099                         extract_token(node, buf, i, '|', sizeof node);
1100                         cprintf("%s\n", node);
1101                 }
1102                 cprintf("000\n");
1103                 return;
1104         }
1105
1106         else if (!strcasecmp(cmd, "runqueue")) {
1107                 run_queue_now = 1;
1108                 cprintf("%d All outbound SMTP will be retried now.\n", CIT_OK);
1109                 return;
1110         }
1111
1112         else {
1113                 cprintf("%d Invalid command.\n", ERROR + ILLEGAL_VALUE);
1114         }
1115
1116 }
1117
1118
1119 CTDL_MODULE_INIT(smtp_queu)
1120 {
1121         char *pstr;
1122
1123         if (!threading)
1124         {
1125                 pstr = getenv("CITSERVER_n_session_max");
1126                 if ((pstr != NULL) && (*pstr != '\0'))
1127                         max_sessions_for_outbound_smtp = atol(pstr); /* how many sessions might be active till we stop adding more smtp jobs */
1128
1129                 pstr = getenv("CITSERVER_smtp_n_delay_count");
1130                 if ((pstr != NULL) && (*pstr != '\0'))
1131                         ndelay_count = atol(pstr); /* every n queued messages we will sleep... */
1132
1133                 pstr = getenv("CITSERVER_smtp_delay");
1134                 if ((pstr != NULL) && (*pstr != '\0'))
1135                         delay_msec = atol(pstr) * 1000; /* this many seconds. */
1136
1137
1138
1139
1140                 CtdlFillSystemContext(&smtp_queue_CC, "SMTP_Send");
1141                 ActiveQItems = NewHash(1, lFlathash);
1142                 pthread_mutex_init(&ActiveQItemsLock, NULL);
1143
1144                 QItemHandlers = NewHash(0, NULL);
1145
1146                 RegisterQItemHandler(HKEY("msgid"),             QItem_Handle_MsgID);
1147                 RegisterQItemHandler(HKEY("envelope_from"),     QItem_Handle_EnvelopeFrom);
1148                 RegisterQItemHandler(HKEY("retry"),             QItem_Handle_retry);
1149                 RegisterQItemHandler(HKEY("attempted"),         QItem_Handle_Attempted);
1150                 RegisterQItemHandler(HKEY("remote"),            QItem_Handle_Recipient);
1151                 RegisterQItemHandler(HKEY("bounceto"),          QItem_Handle_BounceTo);
1152                 RegisterQItemHandler(HKEY("source_room"),       QItem_Handle_SenderRoom);
1153                 RegisterQItemHandler(HKEY("submitted"),         QItem_Handle_Submitted);
1154
1155                 smtp_init_spoolout();
1156
1157                 CtdlRegisterEVCleanupHook(smtp_evq_cleanup);
1158
1159                 CtdlRegisterProtoHook(cmd_smtp, "SMTP", "SMTP utility commands");
1160                 CtdlRegisterSessionHook(smtp_do_queue, EVT_TIMER, PRIO_SEND + 10);
1161         }
1162
1163         /* return our Subversion id for the Log */
1164         return "smtpeventclient";
1165 }