citadel/modules/network/serv_netmail.c

   1 /*
   2  * This module handles shared rooms, inter-Citadel mail, and outbound
   3  * mailing list processing.
   4  *
   5  * Copyright (c) 2000-2012 by the citadel.org team
   6  *
   7  *  This program is open source software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License, version 3.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  16  * This is a fairly high-level type of critical section.  It ensures that no
  17  * two threads work on the netconfigs files at the same time.  Since we do
  18  * so many things inside these, here are the rules:
  19  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  20  *  2. Do *not* perform any I/O with the client during these sections.
  21  *
  22  */
  23
  24 /*
  25  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  26  * requests that have not been confirmed will be deleted.
  27  */
  28 #define EXP     259200  /* three days */
  29
  30 #include "sysdep.h"
  31 #include <stdlib.h>
  32 #include <unistd.h>
  33 #include <stdio.h>
  34 #include <fcntl.h>
  35 #include <ctype.h>
  36 #include <signal.h>
  37 #include <pwd.h>
  38 #include <errno.h>
  39 #include <sys/stat.h>
  40 #include <sys/types.h>
  41 #include <dirent.h>
  42 #if TIME_WITH_SYS_TIME
  43 # include <sys/time.h>
  44 # include <time.h>
  45 #else
  46 # if HAVE_SYS_TIME_H
  47 #  include <sys/time.h>
  48 # else
  49 #  include <time.h>
  50 # endif
  51 #endif
  52 #ifdef HAVE_SYSCALL_H
  53 # include <syscall.h>
  54 #else
  55 # if HAVE_SYS_SYSCALL_H
  56 #  include <sys/syscall.h>
  57 # endif
  58 #endif
  59
  60 #include <sys/wait.h>
  61 #include <string.h>
  62 #include <limits.h>
  63 #include <libcitadel.h>
  64 #include "citadel.h"
  65 #include "server.h"
  66 #include "citserver.h"
  67 #include "support.h"
  68 #include "config.h"
  69 #include "user_ops.h"
  70 #include "database.h"
  71 #include "msgbase.h"
  72 #include "internet_addressing.h"
  73 #include "serv_network.h"
  74 #include "clientsocket.h"
  75 #include "citadel_dirs.h"
  76 #include "threads.h"
  77 #include "context.h"
  78 #include "ctdl_module.h"
  79 #include "netspool.h"
  80 #include "netmail.h"
  81
  82 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc, const char *RoomName);
  83
  84 void aggregate_recipients(StrBuf **recps, RoomNetCfg Which, OneRoomNetCfg *OneRNCfg, long nSegments)
  85 {
  86         int i;
  87         size_t recps_len = 0;
  88         RoomNetCfgLine *nptr;
  89         struct CitContext *CCC = CC;
  90
  91         *recps = NULL;
  92         /*
  93          * Figure out how big a buffer we need to allocate
  94          */
  95         for (nptr = OneRNCfg->NetConfigs[Which]; nptr != NULL; nptr = nptr->next) {
  96                 recps_len = recps_len + StrLength(nptr->Value[0]) + 2;
  97         }
  98
  99         /* Nothing todo... */
 100         if (recps_len == 0)
 101                 return;
 102
 103         *recps = NewStrBufPlain(NULL, recps_len);
 104
 105         if (*recps == NULL) {
 106                 QN_syslog(LOG_EMERG,
 107                           "Cannot allocate %ld bytes for recps...\n",
 108                           (long)recps_len);
 109                 abort();
 110         }
 111
 112         /* Each recipient */
 113         for (nptr = OneRNCfg->NetConfigs[Which]; nptr != NULL; nptr = nptr->next) {
 114                 if (nptr != OneRNCfg->NetConfigs[Which]) {
 115                         for (i = 0; i < nSegments; i++)
 116                                 StrBufAppendBufPlain(*recps, HKEY(","), i);
 117                 }
 118                 StrBufAppendBuf(*recps, nptr->Value[0], 0);
 119                 if (Which == ignet_push_share)
 120                 {
 121                         StrBufAppendBufPlain(*recps, HKEY(","), 0);
 122                         StrBufAppendBuf(*recps, nptr->Value[1], 0);
 123
 124                 }
 125         }
 126 }
 127
 128 static void ListCalculateSubject(struct CtdlMessage *msg)
 129 {
 130         struct CitContext *CCC = CC;
 131         StrBuf *Subject, *FlatSubject;
 132         int rlen;
 133         char *pCh;
 134
 135         if (CM_IsEmpty(msg, eMsgSubject)) {
 136                 Subject = NewStrBufPlain(HKEY("(no subject)"));
 137         }
 138         else {
 139                 Subject = NewStrBufPlain(CM_KEY(msg, eMsgSubject));
 140         }
 141         FlatSubject = NewStrBufPlain(NULL, StrLength(Subject));
 142         StrBuf_RFC822_to_Utf8(FlatSubject, Subject, NULL, NULL);
 143
 144         rlen = strlen(CCC->room.QRname);
 145         pCh  = strstr(ChrPtr(FlatSubject), CCC->room.QRname);
 146         if ((pCh == NULL) ||
 147             (*(pCh + rlen) != ']') ||
 148             (pCh == ChrPtr(FlatSubject)) ||
 149             (*(pCh - 1) != '[')
 150                 )
 151         {
 152                 StrBuf *tmp;
 153                 StrBufPlain(Subject, HKEY("["));
 154                 StrBufAppendBufPlain(Subject,
 155                                      CCC->room.QRname,
 156                                      rlen, 0);
 157                 StrBufAppendBufPlain(Subject, HKEY("] "), 0);
 158                 StrBufAppendBuf(Subject, FlatSubject, 0);
 159                 /* so we can free the right one swap them */
 160                 tmp = Subject;
 161                 Subject = FlatSubject;
 162                 FlatSubject = tmp;
 163                 StrBufRFC2047encode(&Subject, FlatSubject);
 164         }
 165
 166         CM_SetAsFieldSB(msg, eMsgSubject, &Subject);
 167
 168         FreeStrBuf(&FlatSubject);
 169 }
 170
 171 /*
 172  * Deliver digest messages
 173  */
 174 void network_deliver_digest(SpoolControl *sc)
 175 {
 176         struct CitContext *CCC = CC;
 177         long len;
 178         char buf[SIZ];
 179         char *pbuf;
 180         struct CtdlMessage *msg = NULL;
 181         long msglen;
 182         recptypes *valid;
 183         char bounce_to[256];
 184
 185         if (sc->Users[digestrecp] == NULL)
 186                 return;
 187
 188         msg = malloc(sizeof(struct CtdlMessage));
 189         memset(msg, 0, sizeof(struct CtdlMessage));
 190         msg->cm_magic = CTDLMESSAGE_MAGIC;
 191         msg->cm_format_type = FMT_RFC822;
 192         msg->cm_anon_type = MES_NORMAL;
 193
 194         CM_SetFieldLONG(msg, eTimestamp, time(NULL));
 195         CM_SetField(msg, eAuthor, CCC->room.QRname, strlen(CCC->room.QRname));
 196         len = snprintf(buf, sizeof buf, "[%s]", CCC->room.QRname);
 197         CM_SetField(msg, eMsgSubject, buf, len);
 198
 199         CM_SetField(msg, erFc822Addr, SKEY(sc->Users[roommailalias]));
 200         CM_SetField(msg, eRecipient, SKEY(sc->Users[roommailalias]));
 201
 202         /* Set the 'List-ID' header */
 203         CM_SetField(msg, eListID, SKEY(sc->ListID));
 204
 205         /*
 206          * Go fetch the contents of the digest
 207          */
 208         fseek(sc->digestfp, 0L, SEEK_END);
 209         msglen = ftell(sc->digestfp);
 210
 211         pbuf = malloc(msglen + 1);
 212         fseek(sc->digestfp, 0L, SEEK_SET);
 213         fread(pbuf, (size_t)msglen, 1, sc->digestfp);
 214         pbuf[msglen] = '\0';
 215         CM_SetAsField(msg, eMesageText, &pbuf, msglen);
 216
 217         /* Now generate the delivery instructions */
 218
 219         /* Where do we want bounces and other noise to be heard?
 220          * Surely not the list members! */
 221         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 222
 223         /* Now submit the message */
 224         valid = validate_recipients(ChrPtr(sc->Users[digestrecp]), NULL, 0);
 225         if (valid != NULL) {
 226                 valid->bounce_to = strdup(bounce_to);
 227                 valid->envelope_from = strdup(bounce_to);
 228                 CtdlSubmitMsg(msg, valid, NULL, 0);
 229         }
 230         CM_Free(msg);
 231         free_recipients(valid);
 232 }
 233
 234
 235 void network_process_digest(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 236 {
 237
 238         struct CtdlMessage *msg = NULL;
 239
 240         /*
 241          * Process digest recipients
 242          */
 243         if ((sc->Users[digestrecp] == NULL)||
 244             (sc->digestfp == NULL))
 245                 return;
 246
 247         msg = CM_Duplicate(omsg);
 248         if (msg != NULL) {
 249                 sc->haveDigest = 1;
 250                 fprintf(sc->digestfp,
 251                         " -----------------------------------"
 252                         "------------------------------------"
 253                         "-------\n");
 254                 fprintf(sc->digestfp, "From: ");
 255                 if (!CM_IsEmpty(msg, eAuthor)) {
 256                         fprintf(sc->digestfp,
 257                                 "%s ",
 258                                 msg->cm_fields[eAuthor]);
 259                 }
 260                 if (!CM_IsEmpty(msg, erFc822Addr)) {
 261                         fprintf(sc->digestfp,
 262                                 "<%s> ",
 263                                 msg->cm_fields[erFc822Addr]);
 264                 }
 265                 else if (!CM_IsEmpty(msg, eNodeName)) {
 266                         fprintf(sc->digestfp,
 267                                 "@%s ",
 268                                 msg->cm_fields[eNodeName]);
 269                 }
 270                 fprintf(sc->digestfp, "\n");
 271                 if (!CM_IsEmpty(msg, eMsgSubject)) {
 272                         fprintf(sc->digestfp,
 273                                 "Subject: %s\n",
 274                                 msg->cm_fields[eMsgSubject]);
 275                 }
 276
 277                 CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 278
 279                 safestrncpy(CC->preferred_formats,
 280                             "text/plain",
 281                             sizeof CC->preferred_formats);
 282
 283                 CtdlOutputPreLoadedMsg(msg,
 284                                        MT_CITADEL,
 285                                        HEADERS_NONE,
 286                                        0, 0, 0);
 287
 288                 StrBufTrim(CC->redirect_buffer);
 289                 fwrite(HKEY("\n"), 1, sc->digestfp);
 290                 fwrite(SKEY(CC->redirect_buffer), 1, sc->digestfp);
 291                 fwrite(HKEY("\n"), 1, sc->digestfp);
 292
 293                 FreeStrBuf(&CC->redirect_buffer);
 294
 295                 sc->num_msgs_spooled += 1;
 296                 CM_Free(msg);
 297         }
 298 }
 299
 300
 301 void network_process_list(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 302 {
 303         struct CtdlMessage *msg = NULL;
 304
 305         /*
 306          * Process mailing list recipients
 307          */
 308         if (sc->Users[listrecp] == NULL)
 309                 return;
 310
 311         /* create our own copy of the message.
 312          *  We're going to need to modify it
 313          * in order to insert the [list name] in it, etc.
 314          */
 315
 316         msg = CM_Duplicate(omsg);
 317
 318
 319         CM_SetField(msg, eReplyTo, SKEY(sc->Users[roommailalias]));
 320
 321         /* if there is no other recipient, Set the recipient
 322          * of the list message to the email address of the
 323          * room itself.
 324          */
 325         if (CM_IsEmpty(msg, eRecipient))
 326         {
 327                 CM_SetField(msg, eRecipient, SKEY(sc->Users[roommailalias]));
 328         }
 329
 330         /* Set the 'List-ID' header */
 331         CM_SetField(msg, eListID, SKEY(sc->ListID));
 332
 333
 334         /* Prepend "[List name]" to the subject */
 335         ListCalculateSubject(msg);
 336
 337         /* Handle delivery */
 338         network_deliver_list(msg, sc, CC->room.QRname);
 339         CM_Free(msg);
 340 }
 341
 342 /*
 343  * Deliver list messages to everyone on the list ... efficiently
 344  */
 345 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc, const char *RoomName)
 346 {
 347         recptypes *valid;
 348         char bounce_to[256];
 349
 350         /* Don't do this if there were no recipients! */
 351         if (sc->Users[listrecp] == NULL)
 352                 return;
 353
 354         /* Now generate the delivery instructions */
 355
 356         /* Where do we want bounces and other noise to be heard?
 357          *  Surely not the list members! */
 358         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 359
 360         /* Now submit the message */
 361         valid = validate_recipients(ChrPtr(sc->Users[listrecp]), NULL, 0);
 362         if (valid != NULL) {
 363                 valid->bounce_to = strdup(bounce_to);
 364                 valid->envelope_from = strdup(bounce_to);
 365                 valid->sending_room = strdup(RoomName);
 366                 CtdlSubmitMsg(msg, valid, NULL, 0);
 367                 free_recipients(valid);
 368         }
 369         /* Do not call CM_Free(msg) here; the caller will free it. */
 370 }
 371
 372
 373 void network_process_participate(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 374 {
 375         struct CtdlMessage *msg = NULL;
 376         int ok_to_participate = 0;
 377         StrBuf *Buf = NULL;
 378         recptypes *valid;
 379
 380         /*
 381          * Process client-side list participations for this room
 382          */
 383         if (sc->Users[participate] == NULL)
 384                 return;
 385
 386         msg = CM_Duplicate(omsg);
 387
 388         /* Only send messages which originated on our own
 389          * Citadel network, otherwise we'll end up sending the
 390          * remote mailing list's messages back to it, which
 391          * is rude...
 392          */
 393         ok_to_participate = 0;
 394         if (!CM_IsEmpty(msg, eNodeName)) {
 395                 if (!strcasecmp(msg->cm_fields[eNodeName],
 396                                 config.c_nodename)) {
 397                         ok_to_participate = 1;
 398                 }
 399
 400                 Buf = NewStrBufPlain(CM_KEY(msg, eNodeName));
 401                 if (CtdlIsValidNode(NULL,
 402                                     NULL,
 403                                     Buf,
 404                                     sc->working_ignetcfg,
 405                                     sc->the_netmap) == 0)
 406                 {
 407                         ok_to_participate = 1;
 408                 }
 409         }
 410         if (ok_to_participate)
 411         {
 412                 /* Replace the Internet email address of the
 413                  * actual author with the email address of the
 414                  * room itself, so the remote listserv doesn't
 415                  * reject us.
 416                  */
 417                 CM_SetField(msg, erFc822Addr, SKEY(sc->Users[roommailalias]));
 418
 419                 valid = validate_recipients(ChrPtr(sc->Users[participate]) , NULL, 0);
 420
 421                 CM_SetField(msg, eRecipient, SKEY(sc->Users[roommailalias]));
 422                 CtdlSubmitMsg(msg, valid, "", 0);
 423                 free_recipients(valid);
 424         }
 425         FreeStrBuf(&Buf);
 426         CM_Free(msg);
 427 }
 428
 429 void network_process_ignetpush(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 430 {
 431         StrBuf *Recipient;
 432         StrBuf *RemoteRoom;
 433         const char *Pos = NULL;
 434         struct CtdlMessage *msg = NULL;
 435         struct CitContext *CCC = CC;
 436         struct ser_ret sermsg;
 437         char buf[SIZ];
 438         char filename[PATH_MAX];
 439         FILE *fp;
 440         StrBuf *Buf = NULL;
 441         int i;
 442         int bang = 0;
 443         int send = 1;
 444
 445         if (sc->Users[ignet_push_share] == NULL)
 446                 return;
 447
 448         /*
 449          * Process IGnet push shares
 450          */
 451         msg = CM_Duplicate(omsg);
 452
 453         /* Prepend our node name to the Path field whenever
 454          * sending a message to another IGnet node
 455          */
 456         Netmap_AddMe(msg, HKEY("username"));
 457
 458         /*
 459          * Determine if this message is set to be deleted
 460          * after sending out on the network
 461          */
 462         if (!CM_IsEmpty(msg, eSpecialField)) {
 463                 if (!strcasecmp(msg->cm_fields[eSpecialField], "CANCEL")) {
 464                         *delete_after_send = 1;
 465                 }
 466         }
 467
 468         /* Now send it to every node */
 469         Recipient = NewStrBufPlain(NULL, StrLength(sc->Users[ignet_push_share]));
 470         RemoteRoom = NewStrBufPlain(NULL, StrLength(sc->Users[ignet_push_share]));
 471         while ((Pos != StrBufNOTNULL) &&
 472                StrBufExtract_NextToken(Recipient, sc->Users[ignet_push_share], &Pos, ','))
 473         {
 474                 StrBufExtract_NextToken(RemoteRoom, sc->Users[ignet_push_share], &Pos, ',');
 475                 send = 1;
 476                 NewStrBufDupAppendFlush(&Buf, Recipient, NULL, 1);
 477
 478                 /* Check for valid node name */
 479                 if (CtdlIsValidNode(NULL,
 480                                     NULL,
 481                                     Buf,
 482                                     sc->working_ignetcfg,
 483                                     sc->the_netmap) != 0)
 484                 {
 485                         QN_syslog(LOG_ERR,
 486                                   "Invalid node <%s>\n",
 487                                   ChrPtr(Recipient));
 488
 489                         send = 0;
 490                 }
 491
 492                 /* Check for split horizon */
 493                 QN_syslog(LOG_DEBUG, "Path is %s\n", msg->cm_fields[eMessagePath]);
 494                 bang = num_tokens(msg->cm_fields[eMessagePath], '!');
 495                 if (bang > 1) {
 496                         for (i=0; i<(bang-1); ++i) {
 497                                 extract_token(buf,
 498                                               msg->cm_fields[eMessagePath],
 499                                               i, '!',
 500                                               sizeof buf);
 501
 502                                 QN_syslog(LOG_DEBUG, "Compare <%s> to <%s>\n",
 503                                           buf, ChrPtr(Recipient)) ;
 504                                 if (!strcasecmp(buf, ChrPtr(Recipient))) {
 505                                         send = 0;
 506                                         break;
 507                                 }
 508                         }
 509
 510                         QN_syslog(LOG_INFO,
 511                                   " %sSending to %s\n",
 512                                   (send)?"":"Not ",
 513                                   ChrPtr(Recipient));
 514                 }
 515
 516                 /* Send the message */
 517                 if (send == 1)
 518                 {
 519                         /*
 520                          * Force the message to appear in the correct
 521                          * room on the far end by setting the C field
 522                          * correctly
 523                          */
 524                         if (StrLength(RemoteRoom) > 0) {
 525                                 CM_SetField(msg, eRemoteRoom, SKEY(RemoteRoom));
 526                         }
 527                         else {
 528                                 CM_SetField(msg, eRemoteRoom, CCC->room.QRname, strlen(CCC->room.QRname));
 529                         }
 530
 531                         /* serialize it for transmission */
 532                         CtdlSerializeMessage(&sermsg, msg);
 533                         if (sermsg.len > 0) {
 534
 535                                 /* write it to a spool file */
 536                                 snprintf(filename,
 537                                          sizeof(filename),
 538                                          "%s/%s@%lx%x",
 539                                          ctdl_netout_dir,
 540                                          ChrPtr(Recipient),
 541                                          time(NULL),
 542                                          rand()
 543                                         );
 544
 545                                 QN_syslog(LOG_DEBUG,
 546                                           "Appending to %s\n",
 547                                           filename);
 548
 549                                 fp = fopen(filename, "ab");
 550                                 if (fp != NULL) {
 551                                         fwrite(sermsg.ser,
 552                                                sermsg.len, 1, fp);
 553                                         fclose(fp);
 554                                 }
 555                                 else {
 556                                         QN_syslog(LOG_ERR,
 557                                                   "%s: %s\n",
 558                                                   filename,
 559                                                   strerror(errno));
 560                                 }
 561
 562                                 /* free the serialized version */
 563                                 free(sermsg.ser);
 564                         }
 565                 }
 566         }
 567         FreeStrBuf(&Buf);
 568         FreeStrBuf(&Recipient);
 569         FreeStrBuf(&RemoteRoom);
 570         CM_Free(msg);
 571 }
 572
 573
 574 /*
 575  * Spools out one message from the list.
 576  */
 577 void network_spool_msg(long msgnum,
 578                        void *userdata)
 579 {
 580         struct CitContext *CCC = CC;
 581         struct CtdlMessage *msg = NULL;
 582         long delete_after_send = 0;     /* Set to 1 to delete after spooling */
 583         SpoolControl *sc;
 584
 585         sc = (SpoolControl *)userdata;
 586
 587         msg = CtdlFetchMessage(msgnum, 1);
 588
 589         if (msg == NULL)
 590         {
 591                 QN_syslog(LOG_ERR,
 592                           "failed to load Message <%ld> from disk\n",
 593                           msgnum);
 594                 return;
 595         }
 596         network_process_list(sc, msg, &delete_after_send);
 597         network_process_digest(sc, msg, &delete_after_send);
 598         network_process_participate(sc, msg, &delete_after_send);
 599         network_process_ignetpush(sc, msg, &delete_after_send);
 600
 601         CM_Free(msg);
 602
 603         /* update lastsent */
 604         sc->lastsent = msgnum;
 605
 606         /* Delete this message if delete-after-send is set */
 607         if (delete_after_send) {
 608                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 609         }
 610 }