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 "file_ops.h"
  76 #include "citadel_dirs.h"
  77 #include "threads.h"
  78 #include "context.h"
  79 #include "ctdl_module.h"
  80 #include "netspool.h"
  81 #include "netmail.h"
  82
  83 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc, const char *RoomName);
  84
  85 void aggregate_recipients(StrBuf **recps, RoomNetCfg Which, OneRoomNetCfg *OneRNCfg, long nSegments)
  86 {
  87         int i;
  88         size_t recps_len = 0;
  89         RoomNetCfgLine *nptr;
  90         struct CitContext *CCC = CC;
  91
  92         *recps = NULL;
  93         /*
  94          * Figure out how big a buffer we need to allocate
  95          */
  96         for (nptr = OneRNCfg->NetConfigs[Which]; nptr != NULL; nptr = nptr->next) {
  97                 recps_len = recps_len + StrLength(nptr->Value[0]) + 2;
  98         }
  99
 100         /* Nothing todo... */
 101         if (recps_len == 0)
 102                 return;
 103
 104         *recps = NewStrBufPlain(NULL, recps_len);
 105
 106         if (*recps == NULL) {
 107                 QN_syslog(LOG_EMERG,
 108                           "Cannot allocate %ld bytes for recps...\n",
 109                           (long)recps_len);
 110                 abort();
 111         }
 112
 113         /* Each recipient */
 114         for (nptr = OneRNCfg->NetConfigs[Which]; nptr != NULL; nptr = nptr->next) {
 115                 if (nptr != OneRNCfg->NetConfigs[Which]) {
 116                         for (i = 0; i < nSegments; i++)
 117                                 StrBufAppendBufPlain(*recps, HKEY(","), i);
 118                 }
 119                 StrBufAppendBuf(*recps, nptr->Value[0], 0);
 120                 if (Which == ignet_push_share)
 121                 {
 122                         StrBufAppendBufPlain(*recps, HKEY(","), 0);
 123                         StrBufAppendBuf(*recps, nptr->Value[1], 0);
 124
 125                 }
 126         }
 127 }
 128
 129 static void ListCalculateSubject(struct CtdlMessage *msg)
 130 {
 131         struct CitContext *CCC = CC;
 132         StrBuf *Subject, *FlatSubject;
 133         int rlen;
 134         char *pCh;
 135
 136         if (msg->cm_fields['U'] == NULL) {
 137                 Subject = NewStrBufPlain(HKEY("(no subject)"));
 138         }
 139         else {
 140                 Subject = NewStrBufPlain(
 141                         msg->cm_fields['U'], -1);
 142         }
 143         FlatSubject = NewStrBufPlain(NULL, StrLength(Subject));
 144         StrBuf_RFC822_to_Utf8(FlatSubject, Subject, NULL, NULL);
 145
 146         rlen = strlen(CCC->room.QRname);
 147         pCh  = strstr(ChrPtr(FlatSubject), CCC->room.QRname);
 148         if ((pCh == NULL) ||
 149             (*(pCh + rlen) != ']') ||
 150             (pCh == ChrPtr(FlatSubject)) ||
 151             (*(pCh - 1) != '[')
 152                 )
 153         {
 154                 StrBuf *tmp;
 155                 StrBufPlain(Subject, HKEY("["));
 156                 StrBufAppendBufPlain(Subject,
 157                                      CCC->room.QRname,
 158                                      rlen, 0);
 159                 StrBufAppendBufPlain(Subject, HKEY("] "), 0);
 160                 StrBufAppendBuf(Subject, FlatSubject, 0);
 161                 /* so we can free the right one swap them */
 162                 tmp = Subject;
 163                 Subject = FlatSubject;
 164                 FlatSubject = tmp;
 165                 StrBufRFC2047encode(&Subject, FlatSubject);
 166         }
 167
 168         if (msg->cm_fields['U'] != NULL)
 169                 free (msg->cm_fields['U']);
 170         msg->cm_fields['U'] = SmashStrBuf(&Subject);
 171
 172         FreeStrBuf(&FlatSubject);
 173 }
 174
 175 /*
 176  * Deliver digest messages
 177  */
 178 void network_deliver_digest(SpoolControl *sc)
 179 {
 180         char buf[SIZ];
 181         struct CtdlMessage *msg = NULL;
 182         long msglen;
 183         struct recptypes *valid;
 184         char bounce_to[256];
 185
 186         if (sc->Users[listrecp] == NULL)
 187                 return;
 188
 189         if (sc->num_msgs_spooled < 1) {
 190                 fclose(sc->digestfp);
 191                 sc->digestfp = NULL;
 192                 return;
 193         }
 194
 195         msg = malloc(sizeof(struct CtdlMessage));
 196         memset(msg, 0, sizeof(struct CtdlMessage));
 197         msg->cm_magic = CTDLMESSAGE_MAGIC;
 198         msg->cm_format_type = FMT_RFC822;
 199         msg->cm_anon_type = MES_NORMAL;
 200
 201         sprintf(buf, "%ld", time(NULL));
 202         msg->cm_fields['T'] = strdup(buf);
 203         msg->cm_fields['A'] = strdup(CC->room.QRname);
 204         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 205         msg->cm_fields['U'] = strdup(buf);
 206
 207         CtdlMsgSetCM_Fields(msg, 'F', SKEY(sc->Users[roommailalias]));
 208         CtdlMsgSetCM_Fields(msg, 'R', SKEY(sc->Users[roommailalias]));
 209
 210         /* Set the 'List-ID' header */
 211         CtdlMsgSetCM_Fields(msg, 'L', SKEY(sc->ListID));
 212
 213         /*
 214          * Go fetch the contents of the digest
 215          */
 216         fseek(sc->digestfp, 0L, SEEK_END);
 217         msglen = ftell(sc->digestfp);
 218
 219         msg->cm_fields['M'] = malloc(msglen + 1);
 220         fseek(sc->digestfp, 0L, SEEK_SET);
 221         fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 222         msg->cm_fields['M'][msglen] = '\0';
 223
 224         fclose(sc->digestfp);
 225         sc->digestfp = NULL;
 226
 227         /* Now generate the delivery instructions */
 228         if (sc->Users[listrecp] == NULL)
 229                 return;
 230
 231         /* Where do we want bounces and other noise to be heard?
 232          *Surely not the list members! */
 233         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 234
 235         /* Now submit the message */
 236         valid = validate_recipients(ChrPtr(sc->Users[listrecp]), NULL, 0);
 237         if (valid != NULL) {
 238                 valid->bounce_to = strdup(bounce_to);
 239                 valid->envelope_from = strdup(bounce_to);
 240                 CtdlSubmitMsg(msg, valid, NULL, 0);
 241         }
 242         CtdlFreeMessage(msg);
 243         free_recipients(valid);
 244 }
 245
 246
 247 void network_process_digest(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 248 {
 249
 250         struct CtdlMessage *msg = NULL;
 251
 252         /*
 253          * Process digest recipients
 254          */
 255         if ((sc->Users[digestrecp] == NULL)||
 256             (sc->digestfp == NULL))
 257                 return;
 258
 259         msg = CtdlDuplicateMessage(omsg);
 260         if (msg != NULL) {
 261                 fprintf(sc->digestfp,
 262                         " -----------------------------------"
 263                         "------------------------------------"
 264                         "-------\n");
 265                 fprintf(sc->digestfp, "From: ");
 266                 if (msg->cm_fields['A'] != NULL) {
 267                         fprintf(sc->digestfp,
 268                                 "%s ",
 269                                 msg->cm_fields['A']);
 270                 }
 271                 if (msg->cm_fields['F'] != NULL) {
 272                         fprintf(sc->digestfp,
 273                                 "<%s> ",
 274                                 msg->cm_fields['F']);
 275                 }
 276                 else if (msg->cm_fields['N'] != NULL) {
 277                         fprintf(sc->digestfp,
 278                                 "@%s ",
 279                                 msg->cm_fields['N']);
 280                 }
 281                 fprintf(sc->digestfp, "\n");
 282                 if (msg->cm_fields['U'] != NULL) {
 283                         fprintf(sc->digestfp,
 284                                 "Subject: %s\n",
 285                                 msg->cm_fields['U']);
 286                 }
 287
 288                 CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 289
 290                 safestrncpy(CC->preferred_formats,
 291                             "text/plain",
 292                             sizeof CC->preferred_formats);
 293
 294                 CtdlOutputPreLoadedMsg(msg,
 295                                        MT_CITADEL,
 296                                        HEADERS_NONE,
 297                                        0, 0, 0);
 298
 299                 StrBufTrim(CC->redirect_buffer);
 300                 fwrite(HKEY("\n"), 1, sc->digestfp);
 301                 fwrite(SKEY(CC->redirect_buffer), 1, sc->digestfp);
 302                 fwrite(HKEY("\n"), 1, sc->digestfp);
 303
 304                 FreeStrBuf(&CC->redirect_buffer);
 305
 306                 sc->num_msgs_spooled += 1;
 307                 CtdlFreeMessage(msg);
 308         }
 309 }
 310
 311
 312 void network_process_list(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 313 {
 314         struct CtdlMessage *msg = NULL;
 315
 316         /*
 317          * Process mailing list recipients
 318          */
 319         if (sc->Users[listrecp] == NULL)
 320                 return;
 321
 322         /* create our own copy of the message.
 323          *  We're going to need to modify it
 324          * in order to insert the [list name] in it, etc.
 325          */
 326
 327         msg = CtdlDuplicateMessage(omsg);
 328
 329
 330         CtdlMsgSetCM_Fields(msg, 'K', SKEY(sc->Users[roommailalias]));
 331
 332         /* if there is no other recipient, Set the recipient
 333          * of the list message to the email address of the
 334          * room itself.
 335          */
 336         if ((msg->cm_fields['R'] == NULL) ||
 337             IsEmptyStr(msg->cm_fields['R']))
 338         {
 339                 CtdlMsgSetCM_Fields(msg, 'R', SKEY(sc->Users[roommailalias]));
 340         }
 341
 342         /* Set the 'List-ID' header */
 343         CtdlMsgSetCM_Fields(msg, 'L', SKEY(sc->ListID));
 344
 345
 346         /* Prepend "[List name]" to the subject */
 347         ListCalculateSubject(msg);
 348
 349         /* Handle delivery */
 350         network_deliver_list(msg, sc, CC->room.QRname);
 351         CtdlFreeMessage(msg);
 352 }
 353
 354 /*
 355  * Deliver list messages to everyone on the list ... efficiently
 356  */
 357 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc, const char *RoomName)
 358 {
 359         struct recptypes *valid;
 360         char bounce_to[256];
 361
 362         /* Don't do this if there were no recipients! */
 363         if (sc->Users[listrecp] == NULL)
 364                 return;
 365
 366         /* Now generate the delivery instructions */
 367
 368         /* Where do we want bounces and other noise to be heard?
 369          *  Surely not the list members! */
 370         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 371
 372         /* Now submit the message */
 373         valid = validate_recipients(ChrPtr(sc->Users[listrecp]), NULL, 0);
 374         if (valid != NULL) {
 375                 valid->bounce_to = strdup(bounce_to);
 376                 valid->envelope_from = strdup(bounce_to);
 377                 valid->sending_room = strdup(RoomName);
 378                 CtdlSubmitMsg(msg, valid, NULL, 0);
 379                 free_recipients(valid);
 380         }
 381         /* Do not call CtdlFreeMessage(msg) here; the caller will free it. */
 382 }
 383
 384
 385 void network_process_participate(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 386 {
 387         struct CtdlMessage *msg = NULL;
 388         int ok_to_participate = 0;
 389         StrBuf *Buf = NULL;
 390         struct recptypes *valid;
 391
 392         /*
 393          * Process client-side list participations for this room
 394          */
 395         if (sc->Users[participate] == NULL)
 396                 return;
 397
 398         msg = CtdlDuplicateMessage(omsg);
 399
 400         /* Only send messages which originated on our own
 401          * Citadel network, otherwise we'll end up sending the
 402          * remote mailing list's messages back to it, which
 403          * is rude...
 404          */
 405         ok_to_participate = 0;
 406         if (msg->cm_fields['N'] != NULL) {
 407                 if (!strcasecmp(msg->cm_fields['N'],
 408                                 config.c_nodename)) {
 409                         ok_to_participate = 1;
 410                 }
 411
 412                 Buf = NewStrBufPlain(msg->cm_fields['N'], -1);
 413                 if (CtdlIsValidNode(NULL,
 414                                     NULL,
 415                                     Buf,
 416                                     sc->working_ignetcfg,
 417                                     sc->the_netmap) == 0)
 418                 {
 419                         ok_to_participate = 1;
 420                 }
 421         }
 422         if (ok_to_participate)
 423         {
 424                 /* Replace the Internet email address of the
 425                  * actual author with the email address of the
 426                  * room itself, so the remote listserv doesn't
 427                  * reject us.
 428                  */
 429                 CtdlMsgSetCM_Fields(msg, 'F', SKEY(sc->Users[roommailalias]));
 430
 431                 valid = validate_recipients(ChrPtr(sc->Users[participate]) , NULL, 0);
 432
 433                 CtdlMsgSetCM_Fields(msg, 'R', SKEY(sc->Users[roommailalias]));
 434                 CtdlSubmitMsg(msg, valid, "", 0);
 435                 free_recipients(valid);
 436         }
 437         FreeStrBuf(&Buf);
 438         CtdlFreeMessage(msg);
 439 }
 440
 441 void network_process_ignetpush(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 442 {
 443         StrBuf *Recipient;
 444         StrBuf *RemoteRoom;
 445         const char *Pos = NULL;
 446         struct CtdlMessage *msg = NULL;
 447         struct CitContext *CCC = CC;
 448         struct ser_ret sermsg;
 449         char buf[SIZ];
 450         char filename[PATH_MAX];
 451         FILE *fp;
 452         size_t newpath_len;
 453         char *newpath = NULL;
 454         StrBuf *Buf = NULL;
 455         int i;
 456         int bang = 0;
 457         int send = 1;
 458
 459         if (sc->Users[ignet_push_share] == NULL)
 460                 return;
 461
 462         /*
 463          * Process IGnet push shares
 464          */
 465         msg = CtdlDuplicateMessage(omsg);
 466
 467         /* Prepend our node name to the Path field whenever
 468          * sending a message to another IGnet node
 469          */
 470         if (msg->cm_fields['P'] == NULL)
 471         {
 472                 msg->cm_fields['P'] = strdup("username");
 473         }
 474         newpath_len = strlen(msg->cm_fields['P']) +
 475                 strlen(config.c_nodename) + 2;
 476         newpath = malloc(newpath_len);
 477         snprintf(newpath, newpath_len, "%s!%s",
 478                  config.c_nodename, msg->cm_fields['P']);
 479         free(msg->cm_fields['P']);
 480         msg->cm_fields['P'] = newpath;
 481
 482         /*
 483          * Determine if this message is set to be deleted
 484          * after sending out on the network
 485          */
 486         if (msg->cm_fields['S'] != NULL) {
 487                 if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 488                         *delete_after_send = 1;
 489                 }
 490         }
 491
 492         /* Now send it to every node */
 493         Recipient = NewStrBufPlain(NULL, StrLength(sc->Users[ignet_push_share]));
 494         RemoteRoom = NewStrBufPlain(NULL, StrLength(sc->Users[ignet_push_share]));
 495         while ((Pos != StrBufNOTNULL) &&
 496                StrBufExtract_NextToken(Recipient, sc->Users[ignet_push_share], &Pos, ','))
 497         {
 498                 StrBufExtract_NextToken(RemoteRoom, sc->Users[ignet_push_share], &Pos, ',');
 499                 send = 1;
 500                 NewStrBufDupAppendFlush(&Buf, Recipient, NULL, 1);
 501
 502                 /* Check for valid node name */
 503                 if (CtdlIsValidNode(NULL,
 504                                     NULL,
 505                                     Buf,
 506                                     sc->working_ignetcfg,
 507                                     sc->the_netmap) != 0)
 508                 {
 509                         QN_syslog(LOG_ERR,
 510                                   "Invalid node <%s>\n",
 511                                   ChrPtr(Recipient));
 512
 513                         send = 0;
 514                 }
 515
 516                 /* Check for split horizon */
 517                 QN_syslog(LOG_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 518                 bang = num_tokens(msg->cm_fields['P'], '!');
 519                 if (bang > 1) {
 520                         for (i=0; i<(bang-1); ++i) {
 521                                 extract_token(buf,
 522                                               msg->cm_fields['P'],
 523                                               i, '!',
 524                                               sizeof buf);
 525
 526                                 QN_syslog(LOG_DEBUG, "Compare <%s> to <%s>\n",
 527                                           buf, ChrPtr(Recipient)) ;
 528                                 if (!strcasecmp(buf, ChrPtr(Recipient))) {
 529                                         send = 0;
 530                                         break;
 531                                 }
 532                         }
 533
 534                         QN_syslog(LOG_INFO,
 535                                   " %sSending to %s\n",
 536                                   (send)?"":"Not ",
 537                                   ChrPtr(Recipient));
 538                 }
 539
 540                 /* Send the message */
 541                 if (send == 1)
 542                 {
 543                         /*
 544                          * Force the message to appear in the correct
 545                          * room on the far end by setting the C field
 546                          * correctly
 547                          */
 548                         if (msg->cm_fields['C'] != NULL) {
 549                                 free(msg->cm_fields['C']);
 550                         }
 551                         if (StrLength(RemoteRoom) > 0) {
 552                                 msg->cm_fields['C'] =
 553                                         strdup(ChrPtr(RemoteRoom));
 554                         }
 555                         else {
 556                                 msg->cm_fields['C'] =
 557                                         strdup(CC->room.QRname);
 558                         }
 559
 560                         /* serialize it for transmission */
 561                         serialize_message(&sermsg, msg);
 562                         if (sermsg.len > 0) {
 563
 564                                 /* write it to a spool file */
 565                                 snprintf(filename,
 566                                          sizeof(filename),
 567                                          "%s/%s@%lx%x",
 568                                          ctdl_netout_dir,
 569                                          ChrPtr(Recipient),
 570                                          time(NULL),
 571                                          rand()
 572                                         );
 573
 574                                 QN_syslog(LOG_DEBUG,
 575                                           "Appending to %s\n",
 576                                           filename);
 577
 578                                 fp = fopen(filename, "ab");
 579                                 if (fp != NULL) {
 580                                         fwrite(sermsg.ser,
 581                                                sermsg.len, 1, fp);
 582                                         fclose(fp);
 583                                 }
 584                                 else {
 585                                         QN_syslog(LOG_ERR,
 586                                                   "%s: %s\n",
 587                                                   filename,
 588                                                   strerror(errno));
 589                                 }
 590
 591                                 /* free the serialized version */
 592                                 free(sermsg.ser);
 593                         }
 594                 }
 595         }
 596         FreeStrBuf(&Buf);
 597         FreeStrBuf(&Recipient);
 598         FreeStrBuf(&RemoteRoom);
 599         CtdlFreeMessage(msg);
 600 }
 601
 602
 603 /*
 604  * Spools out one message from the list.
 605  */
 606 void network_spool_msg(long msgnum,
 607                        void *userdata)
 608 {
 609         struct CitContext *CCC = CC;
 610         struct CtdlMessage *msg = NULL;
 611         long delete_after_send = 0;     /* Set to 1 to delete after spooling */
 612         SpoolControl *sc;
 613
 614         sc = (SpoolControl *)userdata;
 615
 616         msg = CtdlFetchMessage(msgnum, 1);
 617
 618         if (msg == NULL)
 619         {
 620                 QN_syslog(LOG_ERR,
 621                           "failed to load Message <%ld> from disk\n",
 622                           msgnum);
 623                 return;
 624         }
 625         network_process_list(sc, msg, &delete_after_send);
 626         network_process_digest(sc, msg, &delete_after_send);
 627         network_process_participate(sc, msg, &delete_after_send);
 628         network_process_ignetpush(sc, msg, &delete_after_send);
 629
 630         CtdlFreeMessage(msg);
 631
 632         /* update lastsent */
 633         sc->lastsent = msgnum;
 634
 635         /* Delete this message if delete-after-send is set */
 636         if (delete_after_send) {
 637                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 638         }
 639 }