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) 2000-2011 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 as published by
   9  *  the Free Software Foundation; either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  22  * This is a fairly high-level type of critical section.  It ensures that no
  23  * two threads work on the netconfigs files at the same time.  Since we do
  24  * so many things inside these, here are the rules:
  25  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  26  *  2. Do *not* perform any I/O with the client during these sections.
  27  *
  28  */
  29
  30 /*
  31  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  32  * requests that have not been confirmed will be deleted.
  33  */
  34 #define EXP     259200  /* three days */
  35
  36 #include "sysdep.h"
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <stdio.h>
  40 #include <fcntl.h>
  41 #include <ctype.h>
  42 #include <signal.h>
  43 #include <pwd.h>
  44 #include <errno.h>
  45 #include <sys/stat.h>
  46 #include <sys/types.h>
  47 #include <dirent.h>
  48 #if TIME_WITH_SYS_TIME
  49 # include <sys/time.h>
  50 # include <time.h>
  51 #else
  52 # if HAVE_SYS_TIME_H
  53 #  include <sys/time.h>
  54 # else
  55 #  include <time.h>
  56 # endif
  57 #endif
  58 #ifdef HAVE_SYSCALL_H
  59 # include <syscall.h>
  60 #else
  61 # if HAVE_SYS_SYSCALL_H
  62 #  include <sys/syscall.h>
  63 # endif
  64 #endif
  65
  66 #include <sys/wait.h>
  67 #include <string.h>
  68 #include <limits.h>
  69 #include <libcitadel.h>
  70 #include "citadel.h"
  71 #include "server.h"
  72 #include "citserver.h"
  73 #include "support.h"
  74 #include "config.h"
  75 #include "user_ops.h"
  76 #include "database.h"
  77 #include "msgbase.h"
  78 #include "internet_addressing.h"
  79 #include "serv_network.h"
  80 #include "clientsocket.h"
  81 #include "file_ops.h"
  82 #include "citadel_dirs.h"
  83 #include "threads.h"
  84
  85 #ifndef HAVE_SNPRINTF
  86 #include "snprintf.h"
  87 #endif
  88
  89 #include "context.h"
  90 #include "netconfig.h"
  91 #include "netspool.h"
  92 #include "netmail.h"
  93 #include "ctdl_module.h"
  94
  95
  96 /*
  97  * Deliver digest messages
  98  */
  99 void network_deliver_digest(SpoolControl *sc) {
 100         char buf[SIZ];
 101         int i;
 102         struct CtdlMessage *msg = NULL;
 103         long msglen;
 104         char *recps = NULL;
 105         size_t recps_len = SIZ;
 106         struct recptypes *valid;
 107         namelist *nptr;
 108         char bounce_to[256];
 109
 110         if (sc->num_msgs_spooled < 1) {
 111                 fclose(sc->digestfp);
 112                 sc->digestfp = NULL;
 113                 return;
 114         }
 115
 116         msg = malloc(sizeof(struct CtdlMessage));
 117         memset(msg, 0, sizeof(struct CtdlMessage));
 118         msg->cm_magic = CTDLMESSAGE_MAGIC;
 119         msg->cm_format_type = FMT_RFC822;
 120         msg->cm_anon_type = MES_NORMAL;
 121
 122         sprintf(buf, "%ld", time(NULL));
 123         msg->cm_fields['T'] = strdup(buf);
 124         msg->cm_fields['A'] = strdup(CC->room.QRname);
 125         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 126         msg->cm_fields['U'] = strdup(buf);
 127         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 128         for (i=0; buf[i]; ++i) {
 129                 if (isspace(buf[i])) buf[i]='_';
 130                 buf[i] = tolower(buf[i]);
 131         }
 132         msg->cm_fields['F'] = strdup(buf);
 133         msg->cm_fields['R'] = strdup(buf);
 134
 135         /* Set the 'List-ID' header */
 136         msg->cm_fields['L'] = malloc(1024);
 137         snprintf(msg->cm_fields['L'], 1024,
 138                 "%s <%ld.list-id.%s>",
 139                 CC->room.QRname,
 140                 CC->room.QRnumber,
 141                 config.c_fqdn
 142         );
 143
 144         /*
 145          * Go fetch the contents of the digest
 146          */
 147         fseek(sc->digestfp, 0L, SEEK_END);
 148         msglen = ftell(sc->digestfp);
 149
 150         msg->cm_fields['M'] = malloc(msglen + 1);
 151         fseek(sc->digestfp, 0L, SEEK_SET);
 152         fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 153         msg->cm_fields['M'][msglen] = '\0';
 154
 155         fclose(sc->digestfp);
 156         sc->digestfp = NULL;
 157
 158         /* Now generate the delivery instructions */
 159
 160         /*
 161          * Figure out how big a buffer we need to allocate
 162          */
 163         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 164                 recps_len = recps_len + strlen(nptr->name) + 2;
 165         }
 166
 167         recps = malloc(recps_len);
 168
 169         if (recps == NULL) {
 170                 syslog(LOG_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 171                 abort();
 172         }
 173
 174         strcpy(recps, "");
 175
 176         /* Each recipient */
 177         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 178                 if (nptr != sc->digestrecps) {
 179                         strcat(recps, ",");
 180                 }
 181                 strcat(recps, nptr->name);
 182         }
 183
 184         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 185         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 186
 187         /* Now submit the message */
 188         valid = validate_recipients(recps, NULL, 0);
 189         free(recps);
 190         if (valid != NULL) {
 191                 valid->bounce_to = strdup(bounce_to);
 192                 valid->envelope_from = strdup(bounce_to);
 193                 CtdlSubmitMsg(msg, valid, NULL, 0);
 194         }
 195         CtdlFreeMessage(msg);
 196         free_recipients(valid);
 197 }
 198
 199
 200 /*
 201  * Deliver list messages to everyone on the list ... efficiently
 202  */
 203 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc) {
 204         char *recps = NULL;
 205         size_t recps_len = SIZ;
 206         struct recptypes *valid;
 207         namelist *nptr;
 208         char bounce_to[256];
 209
 210         /* Don't do this if there were no recipients! */
 211         if (sc->listrecps == NULL) return;
 212
 213         /* Now generate the delivery instructions */
 214
 215         /*
 216          * Figure out how big a buffer we need to allocate
 217          */
 218         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 219                 recps_len = recps_len + strlen(nptr->name) + 2;
 220         }
 221
 222         recps = malloc(recps_len);
 223
 224         if (recps == NULL) {
 225                 syslog(LOG_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 226                 abort();
 227         }
 228
 229         strcpy(recps, "");
 230
 231         /* Each recipient */
 232         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 233                 if (nptr != sc->listrecps) {
 234                         strcat(recps, ",");
 235                 }
 236                 strcat(recps, nptr->name);
 237         }
 238
 239         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 240         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 241
 242         /* Now submit the message */
 243         valid = validate_recipients(recps, NULL, 0);
 244         free(recps);
 245         if (valid != NULL) {
 246                 valid->bounce_to = strdup(bounce_to);
 247                 valid->envelope_from = strdup(bounce_to);
 248                 CtdlSubmitMsg(msg, valid, NULL, 0);
 249                 free_recipients(valid);
 250         }
 251         /* Do not call CtdlFreeMessage(msg) here; the caller will free it. */
 252 }
 253
 254
 255
 256
 257 /*
 258  * Spools out one message from the list.
 259  */
 260 void network_spool_msg(long msgnum,
 261                        void *userdata)
 262 {
 263         SpoolControl *sc;
 264         int i;
 265         char *newpath = NULL;
 266         struct CtdlMessage *msg = NULL;
 267         namelist *nptr;
 268         maplist *mptr;
 269         struct ser_ret sermsg;
 270         FILE *fp;
 271         char filename[PATH_MAX];
 272         char buf[SIZ];
 273         int bang = 0;
 274         int send = 1;
 275         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 276         int ok_to_participate = 0;
 277         struct recptypes *valid;
 278
 279         sc = (SpoolControl *)userdata;
 280
 281         /*
 282          * Process mailing list recipients
 283          */
 284         if (sc->listrecps != NULL) {
 285                 /* Fetch the message.  We're going to need to modify it
 286                  * in order to insert the [list name] in it, etc.
 287                  */
 288                 msg = CtdlFetchMessage(msgnum, 1);
 289                 if (msg != NULL) {
 290                         int rlen;
 291                         char *pCh;
 292                         StrBuf *Subject, *FlatSubject;
 293
 294                         if (msg->cm_fields['V'] == NULL){
 295                                 /* local message, no enVelope */
 296                                 StrBuf *Buf;
 297                                 Buf = NewStrBuf();
 298                                 StrBufAppendBufPlain(Buf, msg->cm_fields['O'], -1, 0);
 299                                 StrBufAppendBufPlain(Buf, HKEY("@"), 0);
 300                                 StrBufAppendBufPlain(Buf, config.c_fqdn, -1, 0);
 301
 302                                 msg->cm_fields['K'] = SmashStrBuf(&Buf);
 303                         }
 304                         else {
 305                                 msg->cm_fields['K'] = strdup (msg->cm_fields['V']);
 306                         }
 307                         /* Set the 'List-ID' header */
 308                         if (msg->cm_fields['L'] != NULL) {
 309                                 free(msg->cm_fields['L']);
 310                         }
 311                         msg->cm_fields['L'] = malloc(1024);
 312                         snprintf(msg->cm_fields['L'], 1024,
 313                                 "%s <%ld.list-id.%s>",
 314                                 CC->room.QRname,
 315                                 CC->room.QRnumber,
 316                                 config.c_fqdn
 317                         );
 318
 319                         /* Prepend "[List name]" to the subject */
 320                         if (msg->cm_fields['U'] == NULL) {
 321                                 Subject = NewStrBufPlain(HKEY("(no subject)"));
 322                         }
 323                         else {
 324                                 Subject = NewStrBufPlain(msg->cm_fields['U'], -1);
 325                         }
 326                         FlatSubject = NewStrBufPlain(NULL, StrLength(Subject));
 327                         StrBuf_RFC822_to_Utf8(FlatSubject, Subject, NULL, NULL);
 328
 329                         rlen = strlen(CC->room.QRname);
 330                         pCh  = strstr(ChrPtr(FlatSubject), CC->room.QRname);
 331                         if ((pCh == NULL) ||
 332                             (*(pCh + rlen) != ']') ||
 333                             (pCh == ChrPtr(FlatSubject)) ||
 334                             (*(pCh - 1) != '[')
 335                                 )
 336                         {
 337                                 StrBuf *tmp;
 338                                 StrBufPlain(Subject, HKEY("["));
 339                                 StrBufAppendBufPlain(Subject, CC->room.QRname, rlen, 0);
 340                                 StrBufAppendBufPlain(Subject, HKEY("] "), 0);
 341                                 StrBufAppendBuf(Subject, FlatSubject, 0);
 342                                 tmp = Subject;  Subject = FlatSubject;  FlatSubject = tmp; /* so we can free the right one... */
 343                                 StrBufRFC2047encode(&Subject, FlatSubject);
 344                         }
 345
 346                         if (msg->cm_fields['U'] != NULL)
 347                                 free (msg->cm_fields['U']);
 348                         msg->cm_fields['U'] = SmashStrBuf(&Subject);
 349
 350                         FreeStrBuf(&FlatSubject);
 351
 352                         /* else we won't modify the buffer, since the roomname is already here. */
 353
 354                         /* Set the recipient of the list message to the
 355                          * email address of the room itself.
 356                          * FIXME ... I want to be able to pick any address
 357                          */
 358                         if (msg->cm_fields['R'] != NULL) {
 359                                 free(msg->cm_fields['R']);
 360                         }
 361                         msg->cm_fields['R'] = malloc(256);
 362                         snprintf(msg->cm_fields['R'], 256,
 363                                 "room_%s@%s", CC->room.QRname,
 364                                 config.c_fqdn);
 365                         for (i=0; msg->cm_fields['R'][i]; ++i) {
 366                                 if (isspace(msg->cm_fields['R'][i])) {
 367                                         msg->cm_fields['R'][i] = '_';
 368                                 }
 369                         }
 370
 371                         /* Handle delivery */
 372                         network_deliver_list(msg, sc);
 373                         CtdlFreeMessage(msg);
 374                 }
 375         }
 376
 377         /*
 378          * Process digest recipients
 379          */
 380         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 381                 msg = CtdlFetchMessage(msgnum, 1);
 382                 if (msg != NULL) {
 383                         fprintf(sc->digestfp,   " -----------------------------------"
 384                                                 "------------------------------------"
 385                                                 "-------\n");
 386                         fprintf(sc->digestfp, "From: ");
 387                         if (msg->cm_fields['A'] != NULL) {
 388                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 389                         }
 390                         if (msg->cm_fields['F'] != NULL) {
 391                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 392                         }
 393                         else if (msg->cm_fields['N'] != NULL) {
 394                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 395                         }
 396                         fprintf(sc->digestfp, "\n");
 397                         if (msg->cm_fields['U'] != NULL) {
 398                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 399                         }
 400
 401                         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 402
 403                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 404                         CtdlOutputPreLoadedMsg(msg, MT_CITADEL, HEADERS_NONE, 0, 0, 0);
 405
 406                         StrBufTrim(CC->redirect_buffer);
 407                         fwrite(HKEY("\n"), 1, sc->digestfp);
 408                         fwrite(SKEY(CC->redirect_buffer), 1, sc->digestfp);
 409                         fwrite(HKEY("\n"), 1, sc->digestfp);
 410
 411                         FreeStrBuf(&CC->redirect_buffer);
 412
 413                         sc->num_msgs_spooled += 1;
 414                         free(msg);
 415                 }
 416         }
 417
 418         /*
 419          * Process client-side list participations for this room
 420          */
 421         if (sc->participates != NULL) {
 422                 msg = CtdlFetchMessage(msgnum, 1);
 423                 if (msg != NULL) {
 424
 425                         /* Only send messages which originated on our own Citadel
 426                          * network, otherwise we'll end up sending the remote
 427                          * mailing list's messages back to it, which is rude...
 428                          */
 429                         ok_to_participate = 0;
 430                         if (msg->cm_fields['N'] != NULL) {
 431                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 432                                         ok_to_participate = 1;
 433                                 }
 434                                 if (is_valid_node(NULL,
 435                                                   NULL,
 436                                                   msg->cm_fields['N'],
 437                                                   sc->working_ignetcfg,
 438                                                   sc->the_netmap) == 0)
 439                                 {
 440                                         ok_to_participate = 1;
 441                                 }
 442                         }
 443                         if (ok_to_participate) {
 444                                 if (msg->cm_fields['F'] != NULL) {
 445                                         free(msg->cm_fields['F']);
 446                                 }
 447                                 msg->cm_fields['F'] = malloc(SIZ);
 448                                 /* Replace the Internet email address of the actual
 449                                 * author with the email address of the room itself,
 450                                 * so the remote listserv doesn't reject us.
 451                                 * FIXME ... I want to be able to pick any address
 452                                 */
 453                                 snprintf(msg->cm_fields['F'], SIZ,
 454                                         "room_%s@%s", CC->room.QRname,
 455                                         config.c_fqdn);
 456                                 for (i=0; msg->cm_fields['F'][i]; ++i) {
 457                                         if (isspace(msg->cm_fields['F'][i])) {
 458                                                 msg->cm_fields['F'][i] = '_';
 459                                         }
 460                                 }
 461
 462                                 /*
 463                                  * Figure out how big a buffer we need to allocate
 464                                  */
 465                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 466
 467                                         if (msg->cm_fields['R'] == NULL) {
 468                                                 free(msg->cm_fields['R']);
 469                                         }
 470                                         msg->cm_fields['R'] = strdup(nptr->name);
 471
 472                                         valid = validate_recipients(nptr->name, NULL, 0);
 473                                         CtdlSubmitMsg(msg, valid, "", 0);
 474                                         free_recipients(valid);
 475                                 }
 476
 477                         }
 478                         CtdlFreeMessage(msg);
 479                 }
 480         }
 481
 482         /*
 483          * Process IGnet push shares
 484          */
 485         msg = CtdlFetchMessage(msgnum, 1);
 486         if (msg != NULL) {
 487                 size_t newpath_len;
 488
 489                 /* Prepend our node name to the Path field whenever
 490                  * sending a message to another IGnet node
 491                  */
 492                 if (msg->cm_fields['P'] == NULL) {
 493                         msg->cm_fields['P'] = strdup("username");
 494                 }
 495                 newpath_len = strlen(msg->cm_fields['P']) +
 496                          strlen(config.c_nodename) + 2;
 497                 newpath = malloc(newpath_len);
 498                 snprintf(newpath, newpath_len, "%s!%s",
 499                          config.c_nodename, msg->cm_fields['P']);
 500                 free(msg->cm_fields['P']);
 501                 msg->cm_fields['P'] = newpath;
 502
 503                 /*
 504                  * Determine if this message is set to be deleted
 505                  * after sending out on the network
 506                  */
 507                 if (msg->cm_fields['S'] != NULL) {
 508                         if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 509                                 delete_after_send = 1;
 510                         }
 511                 }
 512
 513                 /* Now send it to every node */
 514                 if (sc->ignet_push_shares != NULL)
 515                   for (mptr = sc->ignet_push_shares; mptr != NULL;
 516                     mptr = mptr->next) {
 517
 518                         send = 1;
 519
 520                         /* Check for valid node name */
 521                         if (is_valid_node(NULL,
 522                                           NULL,
 523                                           mptr->remote_nodename,
 524                                           sc->working_ignetcfg,
 525                                           sc->the_netmap) != 0)
 526                         {
 527                                 syslog(LOG_ERR, "Invalid node <%s>\n", mptr->remote_nodename);
 528                                 send = 0;
 529                         }
 530
 531                         /* Check for split horizon */
 532                         syslog(LOG_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 533                         bang = num_tokens(msg->cm_fields['P'], '!');
 534                         if (bang > 1) for (i=0; i<(bang-1); ++i) {
 535                                 extract_token(buf, msg->cm_fields['P'], i, '!', sizeof buf);
 536                                 syslog(LOG_DEBUG, "Compare <%s> to <%s>\n",
 537                                         buf, mptr->remote_nodename) ;
 538                                 if (!strcasecmp(buf, mptr->remote_nodename)) {
 539                                         send = 0;
 540                                         syslog(LOG_DEBUG, "Not sending to %s\n",
 541                                                 mptr->remote_nodename);
 542                                 }
 543                                 else {
 544                                         syslog(LOG_DEBUG, "Sending to %s\n", mptr->remote_nodename);
 545                                 }
 546                         }
 547
 548                         /* Send the message */
 549                         if (send == 1) {
 550
 551                                 /*
 552                                  * Force the message to appear in the correct room
 553                                  * on the far end by setting the C field correctly
 554                                  */
 555                                 if (msg->cm_fields['C'] != NULL) {
 556                                         free(msg->cm_fields['C']);
 557                                 }
 558                                 if (!IsEmptyStr(mptr->remote_roomname)) {
 559                                         msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 560                                 }
 561                                 else {
 562                                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 563                                 }
 564
 565                                 /* serialize it for transmission */
 566                                 serialize_message(&sermsg, msg);
 567                                 if (sermsg.len > 0) {
 568
 569                                         /* write it to a spool file */
 570                                         snprintf(filename, sizeof filename,"%s/%s@%lx%x",
 571                                                 ctdl_netout_dir,
 572                                                 mptr->remote_nodename,
 573                                                 time(NULL),
 574                                                 rand()
 575                                         );
 576                                         syslog(LOG_DEBUG, "Appending to %s\n", filename);
 577                                         fp = fopen(filename, "ab");
 578                                         if (fp != NULL) {
 579                                                 fwrite(sermsg.ser,
 580                                                         sermsg.len, 1, fp);
 581                                                 fclose(fp);
 582                                         }
 583                                         else {
 584                                                 syslog(LOG_ERR, "%s: %s\n", filename, strerror(errno));
 585                                         }
 586
 587                                         /* free the serialized version */
 588                                         free(sermsg.ser);
 589                                 }
 590
 591                         }
 592                 }
 593                 CtdlFreeMessage(msg);
 594         }
 595
 596         /* update lastsent */
 597         sc->lastsent = msgnum;
 598
 599         /* Delete this message if delete-after-send is set */
 600         if (delete_after_send) {
 601                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 602         }
 603
 604 }