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