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) 2000-2016 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", CtdlGetConfigStr("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         if (sc->Users[digestrecp] == NULL)
 241                 return;
 242
 243         /* If there are digest recipients, we have to build a digest */
 244         if (sc->digestfp == NULL) {
 245
 246                 sc->digestfp = create_digest_file(&sc->room, 1);
 247
 248                 if (sc->digestfp == NULL)
 249                         return;
 250
 251                 sc->haveDigest = ftell(sc->digestfp) > 0;
 252                 if (!sc->haveDigest) {
 253                         fprintf(sc->digestfp, "Content-type: text/plain\n\n");
 254                 }
 255                 sc->haveDigest = 1;
 256         }
 257
 258         msg = CM_Duplicate(omsg);
 259         if (msg != NULL) {
 260                 sc->haveDigest = 1;
 261                 fprintf(sc->digestfp,
 262                         " -----------------------------------"
 263                         "------------------------------------"
 264                         "-------\n");
 265                 fprintf(sc->digestfp, "From: ");
 266                 if (!CM_IsEmpty(msg, eAuthor)) {
 267                         fprintf(sc->digestfp,
 268                                 "%s ",
 269                                 msg->cm_fields[eAuthor]);
 270                 }
 271                 if (!CM_IsEmpty(msg, erFc822Addr)) {
 272                         fprintf(sc->digestfp,
 273                                 "<%s> ",
 274                                 msg->cm_fields[erFc822Addr]);
 275                 }
 276                 else if (!CM_IsEmpty(msg, eNodeName)) {
 277                         fprintf(sc->digestfp,
 278                                 "@%s ",
 279                                 msg->cm_fields[eNodeName]);
 280                 }
 281                 fprintf(sc->digestfp, "\n");
 282                 if (!CM_IsEmpty(msg, eMsgSubject)) {
 283                         fprintf(sc->digestfp,
 284                                 "Subject: %s\n",
 285                                 msg->cm_fields[eMsgSubject]);
 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                 CM_Free(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 = CM_Duplicate(omsg);
 328
 329
 330         CM_SetField(msg, eReplyTo, 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 (CM_IsEmpty(msg, eRecipient))
 337         {
 338                 CM_SetField(msg, eRecipient, SKEY(sc->Users[roommailalias]));
 339         }
 340
 341         /* Set the 'List-ID' header */
 342         CM_SetField(msg, eListID, SKEY(sc->ListID));
 343
 344
 345         /* Prepend "[List name]" to the subject */
 346         ListCalculateSubject(msg);
 347
 348         /* Handle delivery */
 349         network_deliver_list(msg, sc, CC->room.QRname);
 350         CM_Free(msg);
 351 }
 352
 353 /*
 354  * Deliver list messages to everyone on the list ... efficiently
 355  */
 356 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc, const char *RoomName)
 357 {
 358         recptypes *valid;
 359         char bounce_to[256];
 360
 361         /* Don't do this if there were no recipients! */
 362         if (sc->Users[listrecp] == NULL)
 363                 return;
 364
 365         /* Now generate the delivery instructions */
 366
 367         /* Where do we want bounces and other noise to be heard?
 368          *  Surely not the list members! */
 369         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", CtdlGetConfigStr("c_fqdn"));
 370
 371         /* Now submit the message */
 372         valid = validate_recipients(ChrPtr(sc->Users[listrecp]), NULL, 0);
 373         if (valid != NULL) {
 374                 valid->bounce_to = strdup(bounce_to);
 375                 valid->envelope_from = strdup(bounce_to);
 376                 valid->sending_room = strdup(RoomName);
 377                 CtdlSubmitMsg(msg, valid, NULL, 0);
 378                 free_recipients(valid);
 379         }
 380         /* Do not call CM_Free(msg) here; the caller will free it. */
 381 }
 382
 383
 384 void network_process_participate(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 385 {
 386         struct CtdlMessage *msg = NULL;
 387         int ok_to_participate = 0;
 388         StrBuf *Buf = NULL;
 389         recptypes *valid;
 390
 391         /*
 392          * Process client-side list participations for this room
 393          */
 394         if (sc->Users[participate] == NULL)
 395                 return;
 396
 397         msg = CM_Duplicate(omsg);
 398
 399         /* Only send messages which originated on our own
 400          * Citadel network, otherwise we'll end up sending the
 401          * remote mailing list's messages back to it, which
 402          * is rude...
 403          */
 404         ok_to_participate = 0;
 405         if (!CM_IsEmpty(msg, eNodeName)) {
 406                 if (!strcasecmp(msg->cm_fields[eNodeName], CtdlGetConfigStr("c_nodename")))
 407                 {
 408                         ok_to_participate = 1;
 409                 }
 410
 411                 Buf = NewStrBufPlain(CM_KEY(msg, eNodeName));
 412                 if (CtdlIsValidNode(NULL,
 413                                     NULL,
 414                                     Buf,
 415                                     sc->working_ignetcfg,
 416                                     sc->the_netmap) == 0)
 417                 {
 418                         ok_to_participate = 1;
 419                 }
 420         }
 421         if (ok_to_participate)
 422         {
 423                 /* Replace the Internet email address of the
 424                  * actual author with the email address of the
 425                  * room itself, so the remote listserv doesn't
 426                  * reject us.
 427                  */
 428                 CM_SetField(msg, erFc822Addr, SKEY(sc->Users[roommailalias]));
 429
 430                 valid = validate_recipients(ChrPtr(sc->Users[participate]) , NULL, 0);
 431
 432                 CM_SetField(msg, eRecipient, SKEY(sc->Users[roommailalias]));
 433                 CtdlSubmitMsg(msg, valid, "", 0);
 434                 free_recipients(valid);
 435         }
 436         FreeStrBuf(&Buf);
 437         CM_Free(msg);
 438 }
 439
 440 void network_process_ignetpush(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 441 {
 442         StrBuf *Recipient;
 443         StrBuf *RemoteRoom;
 444         const char *Pos = NULL;
 445         struct CtdlMessage *msg = NULL;
 446         struct CitContext *CCC = CC;
 447         struct ser_ret sermsg;
 448         char buf[SIZ];
 449         char filename[PATH_MAX];
 450         FILE *fp;
 451         StrBuf *Buf = NULL;
 452         int i;
 453         int bang = 0;
 454         int send = 1;
 455
 456         if (sc->Users[ignet_push_share] == NULL)
 457                 return;
 458
 459         /*
 460          * Process IGnet push shares
 461          */
 462         msg = CM_Duplicate(omsg);
 463
 464         /* Prepend our node name to the Path field whenever
 465          * sending a message to another IGnet node
 466          */
 467         Netmap_AddMe(msg, HKEY("username"));
 468
 469         /*
 470          * Determine if this message is set to be deleted
 471          * after sending out on the network
 472          */
 473         if (!CM_IsEmpty(msg, eSpecialField)) {
 474                 if (!strcasecmp(msg->cm_fields[eSpecialField], "CANCEL")) {
 475                         *delete_after_send = 1;
 476                 }
 477         }
 478
 479         /* Now send it to every node */
 480         Recipient = NewStrBufPlain(NULL, StrLength(sc->Users[ignet_push_share]));
 481         RemoteRoom = NewStrBufPlain(NULL, StrLength(sc->Users[ignet_push_share]));
 482         while ((Pos != StrBufNOTNULL) &&
 483                StrBufExtract_NextToken(Recipient, sc->Users[ignet_push_share], &Pos, ','))
 484         {
 485                 StrBufExtract_NextToken(RemoteRoom, sc->Users[ignet_push_share], &Pos, ',');
 486                 send = 1;
 487                 NewStrBufDupAppendFlush(&Buf, Recipient, NULL, 1);
 488
 489                 /* Check for valid node name */
 490                 if (CtdlIsValidNode(NULL,
 491                                     NULL,
 492                                     Buf,
 493                                     sc->working_ignetcfg,
 494                                     sc->the_netmap) != 0)
 495                 {
 496                         QN_syslog(LOG_ERR,
 497                                   "Invalid node <%s>\n",
 498                                   ChrPtr(Recipient));
 499
 500                         send = 0;
 501                 }
 502
 503                 /* Check for split horizon */
 504                 QN_syslog(LOG_DEBUG, "Path is %s\n", msg->cm_fields[eMessagePath]);
 505                 bang = num_tokens(msg->cm_fields[eMessagePath], '!');
 506                 if (bang > 1) {
 507                         for (i=0; i<(bang-1); ++i) {
 508                                 extract_token(buf,
 509                                               msg->cm_fields[eMessagePath],
 510                                               i, '!',
 511                                               sizeof buf);
 512
 513                                 QN_syslog(LOG_DEBUG, "Compare <%s> to <%s>\n",
 514                                           buf, ChrPtr(Recipient)) ;
 515                                 if (!strcasecmp(buf, ChrPtr(Recipient))) {
 516                                         send = 0;
 517                                         break;
 518                                 }
 519                         }
 520
 521                         QN_syslog(LOG_INFO,
 522                                   " %sSending to %s\n",
 523                                   (send)?"":"Not ",
 524                                   ChrPtr(Recipient));
 525                 }
 526
 527                 /* Send the message */
 528                 if (send == 1)
 529                 {
 530                         /*
 531                          * Force the message to appear in the correct
 532                          * room on the far end by setting the C field
 533                          * correctly
 534                          */
 535                         if (StrLength(RemoteRoom) > 0) {
 536                                 CM_SetField(msg, eRemoteRoom, SKEY(RemoteRoom));
 537                         }
 538                         else {
 539                                 CM_SetField(msg, eRemoteRoom, CCC->room.QRname, strlen(CCC->room.QRname));
 540                         }
 541
 542                         /* serialize it for transmission */
 543                         CtdlSerializeMessage(&sermsg, msg);
 544                         if (sermsg.len > 0) {
 545
 546                                 /* write it to a spool file */
 547                                 snprintf(filename,
 548                                          sizeof(filename),
 549                                          "%s/%s@%lx%x",
 550                                          ctdl_netout_dir,
 551                                          ChrPtr(Recipient),
 552                                          time(NULL),
 553                                          rand()
 554                                         );
 555
 556                                 QN_syslog(LOG_DEBUG,
 557                                           "Appending to %s\n",
 558                                           filename);
 559
 560                                 fp = fopen(filename, "ab");
 561                                 if (fp != NULL) {
 562                                         fwrite(sermsg.ser,
 563                                                sermsg.len, 1, fp);
 564                                         fclose(fp);
 565                                 }
 566                                 else {
 567                                         QN_syslog(LOG_ERR,
 568                                                   "%s: %s\n",
 569                                                   filename,
 570                                                   strerror(errno));
 571                                 }
 572
 573                                 /* free the serialized version */
 574                                 free(sermsg.ser);
 575                         }
 576                 }
 577         }
 578         FreeStrBuf(&Buf);
 579         FreeStrBuf(&Recipient);
 580         FreeStrBuf(&RemoteRoom);
 581         CM_Free(msg);
 582 }
 583
 584
 585 /*
 586  * Spools out one message from the list.
 587  */
 588 void network_spool_msg(long msgnum, void *userdata)
 589 {
 590         struct CtdlMessage *msg = NULL;
 591         long delete_after_send = 0;     /* Set to 1 to delete after spooling */
 592         SpoolControl *sc;
 593
 594         sc = (SpoolControl *)userdata;
 595         msg = CtdlFetchMessage(msgnum, 1, 1);
 596
 597         if (msg == NULL)
 598         {
 599                 syslog(LOG_ERR, "failed to load Message <%ld> from disk\n", msgnum);
 600                 return;
 601         }
 602         network_process_list(sc, msg, &delete_after_send);
 603         network_process_digest(sc, msg, &delete_after_send);
 604         network_process_participate(sc, msg, &delete_after_send);
 605         network_process_ignetpush(sc, msg, &delete_after_send);
 606
 607         CM_Free(msg);
 608
 609         /* update lastsent */
 610         sc->lastsent = msgnum;
 611
 612         /* Delete this message if delete-after-send is set */
 613         if (delete_after_send) {
 614                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 615         }
 616 }