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 "ctdl_module.h"
  92
  93
  94 /*
  95  * Deliver digest messages
  96  */
  97 void network_deliver_digest(SpoolControl *sc) {
  98         char buf[SIZ];
  99         int i;
 100         struct CtdlMessage *msg = NULL;
 101         long msglen;
 102         char *recps = NULL;
 103         size_t recps_len = SIZ;
 104         struct recptypes *valid;
 105         namelist *nptr;
 106         char bounce_to[256];
 107
 108         if (sc->num_msgs_spooled < 1) {
 109                 fclose(sc->digestfp);
 110                 sc->digestfp = NULL;
 111                 return;
 112         }
 113
 114         msg = malloc(sizeof(struct CtdlMessage));
 115         memset(msg, 0, sizeof(struct CtdlMessage));
 116         msg->cm_magic = CTDLMESSAGE_MAGIC;
 117         msg->cm_format_type = FMT_RFC822;
 118         msg->cm_anon_type = MES_NORMAL;
 119
 120         sprintf(buf, "%ld", time(NULL));
 121         msg->cm_fields['T'] = strdup(buf);
 122         msg->cm_fields['A'] = strdup(CC->room.QRname);
 123         snprintf(buf, sizeof buf, "[%s]", CC->room.QRname);
 124         msg->cm_fields['U'] = strdup(buf);
 125         sprintf(buf, "room_%s@%s", CC->room.QRname, config.c_fqdn);
 126         for (i=0; buf[i]; ++i) {
 127                 if (isspace(buf[i])) buf[i]='_';
 128                 buf[i] = tolower(buf[i]);
 129         }
 130         msg->cm_fields['F'] = strdup(buf);
 131         msg->cm_fields['R'] = strdup(buf);
 132
 133         /* Set the 'List-ID' header */
 134         msg->cm_fields['L'] = malloc(1024);
 135         snprintf(msg->cm_fields['L'], 1024,
 136                 "%s <%ld.list-id.%s>",
 137                 CC->room.QRname,
 138                 CC->room.QRnumber,
 139                 config.c_fqdn
 140         );
 141
 142         /*
 143          * Go fetch the contents of the digest
 144          */
 145         fseek(sc->digestfp, 0L, SEEK_END);
 146         msglen = ftell(sc->digestfp);
 147
 148         msg->cm_fields['M'] = malloc(msglen + 1);
 149         fseek(sc->digestfp, 0L, SEEK_SET);
 150         fread(msg->cm_fields['M'], (size_t)msglen, 1, sc->digestfp);
 151         msg->cm_fields['M'][msglen] = '\0';
 152
 153         fclose(sc->digestfp);
 154         sc->digestfp = NULL;
 155
 156         /* Now generate the delivery instructions */
 157
 158         /*
 159          * Figure out how big a buffer we need to allocate
 160          */
 161         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 162                 recps_len = recps_len + strlen(nptr->name) + 2;
 163         }
 164
 165         recps = malloc(recps_len);
 166
 167         if (recps == NULL) {
 168                 syslog(LOG_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 169                 abort();
 170         }
 171
 172         strcpy(recps, "");
 173
 174         /* Each recipient */
 175         for (nptr = sc->digestrecps; nptr != NULL; nptr = nptr->next) {
 176                 if (nptr != sc->digestrecps) {
 177                         strcat(recps, ",");
 178                 }
 179                 strcat(recps, nptr->name);
 180         }
 181
 182         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 183         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 184
 185         /* Now submit the message */
 186         valid = validate_recipients(recps, NULL, 0);
 187         free(recps);
 188         if (valid != NULL) {
 189                 valid->bounce_to = strdup(bounce_to);
 190                 valid->envelope_from = strdup(bounce_to);
 191                 CtdlSubmitMsg(msg, valid, NULL, 0);
 192         }
 193         CtdlFreeMessage(msg);
 194         free_recipients(valid);
 195 }
 196
 197
 198 /*
 199  * Deliver list messages to everyone on the list ... efficiently
 200  */
 201 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc) {
 202         char *recps = NULL;
 203         size_t recps_len = SIZ;
 204         struct recptypes *valid;
 205         namelist *nptr;
 206         char bounce_to[256];
 207
 208         /* Don't do this if there were no recipients! */
 209         if (sc->listrecps == NULL) return;
 210
 211         /* Now generate the delivery instructions */
 212
 213         /*
 214          * Figure out how big a buffer we need to allocate
 215          */
 216         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 217                 recps_len = recps_len + strlen(nptr->name) + 2;
 218         }
 219
 220         recps = malloc(recps_len);
 221
 222         if (recps == NULL) {
 223                 syslog(LOG_EMERG, "Cannot allocate %ld bytes for recps...\n", (long)recps_len);
 224                 abort();
 225         }
 226
 227         strcpy(recps, "");
 228
 229         /* Each recipient */
 230         for (nptr = sc->listrecps; nptr != NULL; nptr = nptr->next) {
 231                 if (nptr != sc->listrecps) {
 232                         strcat(recps, ",");
 233                 }
 234                 strcat(recps, nptr->name);
 235         }
 236
 237         /* Where do we want bounces and other noise to be heard?  Surely not the list members! */
 238         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", config.c_fqdn);
 239
 240         /* Now submit the message */
 241         valid = validate_recipients(recps, NULL, 0);
 242         free(recps);
 243         if (valid != NULL) {
 244                 valid->bounce_to = strdup(bounce_to);
 245                 valid->envelope_from = strdup(bounce_to);
 246                 CtdlSubmitMsg(msg, valid, NULL, 0);
 247                 free_recipients(valid);
 248         }
 249         /* Do not call CtdlFreeMessage(msg) here; the caller will free it. */
 250 }
 251
 252
 253
 254
 255 /*
 256  * Spools out one message from the list.
 257  */
 258 void network_spool_msg(long msgnum, void *userdata) {
 259         SpoolControl *sc;
 260         int i;
 261         char *newpath = NULL;
 262         struct CtdlMessage *msg = NULL;
 263         namelist *nptr;
 264         maplist *mptr;
 265         struct ser_ret sermsg;
 266         FILE *fp;
 267         char filename[PATH_MAX];
 268         char buf[SIZ];
 269         int bang = 0;
 270         int send = 1;
 271         int delete_after_send = 0;      /* Set to 1 to delete after spooling */
 272         int ok_to_participate = 0;
 273         struct recptypes *valid;
 274
 275         sc = (SpoolControl *)userdata;
 276
 277         /*
 278          * Process mailing list recipients
 279          */
 280         if (sc->listrecps != NULL) {
 281                 /* Fetch the message.  We're going to need to modify it
 282                  * in order to insert the [list name] in it, etc.
 283                  */
 284                 msg = CtdlFetchMessage(msgnum, 1);
 285                 if (msg != NULL) {
 286                         int rlen;
 287                         char *pCh;
 288                         StrBuf *Subject, *FlatSubject;
 289
 290                         if (msg->cm_fields['V'] == NULL){
 291                                 /* local message, no enVelope */
 292                                 StrBuf *Buf;
 293                                 Buf = NewStrBuf();
 294                                 StrBufAppendBufPlain(Buf, msg->cm_fields['O'], -1, 0);
 295                                 StrBufAppendBufPlain(Buf, HKEY("@"), 0);
 296                                 StrBufAppendBufPlain(Buf, config.c_fqdn, -1, 0);
 297
 298                                 msg->cm_fields['K'] = SmashStrBuf(&Buf);
 299                         }
 300                         else {
 301                                 msg->cm_fields['K'] = strdup (msg->cm_fields['V']);
 302                         }
 303                         /* Set the 'List-ID' header */
 304                         if (msg->cm_fields['L'] != NULL) {
 305                                 free(msg->cm_fields['L']);
 306                         }
 307                         msg->cm_fields['L'] = malloc(1024);
 308                         snprintf(msg->cm_fields['L'], 1024,
 309                                 "%s <%ld.list-id.%s>",
 310                                 CC->room.QRname,
 311                                 CC->room.QRnumber,
 312                                 config.c_fqdn
 313                         );
 314
 315                         /* Prepend "[List name]" to the subject */
 316                         if (msg->cm_fields['U'] == NULL) {
 317                                 Subject = NewStrBufPlain(HKEY("(no subject)"));
 318                         }
 319                         else {
 320                                 Subject = NewStrBufPlain(msg->cm_fields['U'], -1);
 321                         }
 322                         FlatSubject = NewStrBufPlain(NULL, StrLength(Subject));
 323                         StrBuf_RFC822_to_Utf8(FlatSubject, Subject, NULL, NULL);
 324
 325                         rlen = strlen(CC->room.QRname);
 326                         pCh  = strstr(ChrPtr(FlatSubject), CC->room.QRname);
 327                         if ((pCh == NULL) ||
 328                             (*(pCh + rlen) != ']') ||
 329                             (pCh == ChrPtr(FlatSubject)) ||
 330                             (*(pCh - 1) != '[')
 331                                 )
 332                         {
 333                                 StrBuf *tmp;
 334                                 StrBufPlain(Subject, HKEY("["));
 335                                 StrBufAppendBufPlain(Subject, CC->room.QRname, rlen, 0);
 336                                 StrBufAppendBufPlain(Subject, HKEY("] "), 0);
 337                                 StrBufAppendBuf(Subject, FlatSubject, 0);
 338                                 tmp = Subject;  Subject = FlatSubject;  FlatSubject = tmp; /* so we can free the right one... */
 339                                 StrBufRFC2047encode(&Subject, FlatSubject);
 340                         }
 341
 342                         if (msg->cm_fields['U'] != NULL)
 343                                 free (msg->cm_fields['U']);
 344                         msg->cm_fields['U'] = SmashStrBuf(&Subject);
 345
 346                         FreeStrBuf(&FlatSubject);
 347
 348                         /* else we won't modify the buffer, since the roomname is already here. */
 349
 350                         /* Set the recipient of the list message to the
 351                          * email address of the room itself.
 352                          * FIXME ... I want to be able to pick any address
 353                          */
 354                         if (msg->cm_fields['R'] != NULL) {
 355                                 free(msg->cm_fields['R']);
 356                         }
 357                         msg->cm_fields['R'] = malloc(256);
 358                         snprintf(msg->cm_fields['R'], 256,
 359                                 "room_%s@%s", CC->room.QRname,
 360                                 config.c_fqdn);
 361                         for (i=0; msg->cm_fields['R'][i]; ++i) {
 362                                 if (isspace(msg->cm_fields['R'][i])) {
 363                                         msg->cm_fields['R'][i] = '_';
 364                                 }
 365                         }
 366
 367                         /* Handle delivery */
 368                         network_deliver_list(msg, sc);
 369                         CtdlFreeMessage(msg);
 370                 }
 371         }
 372
 373         /*
 374          * Process digest recipients
 375          */
 376         if ((sc->digestrecps != NULL) && (sc->digestfp != NULL)) {
 377                 msg = CtdlFetchMessage(msgnum, 1);
 378                 if (msg != NULL) {
 379                         fprintf(sc->digestfp,   " -----------------------------------"
 380                                                 "------------------------------------"
 381                                                 "-------\n");
 382                         fprintf(sc->digestfp, "From: ");
 383                         if (msg->cm_fields['A'] != NULL) {
 384                                 fprintf(sc->digestfp, "%s ", msg->cm_fields['A']);
 385                         }
 386                         if (msg->cm_fields['F'] != NULL) {
 387                                 fprintf(sc->digestfp, "<%s> ", msg->cm_fields['F']);
 388                         }
 389                         else if (msg->cm_fields['N'] != NULL) {
 390                                 fprintf(sc->digestfp, "@%s ", msg->cm_fields['N']);
 391                         }
 392                         fprintf(sc->digestfp, "\n");
 393                         if (msg->cm_fields['U'] != NULL) {
 394                                 fprintf(sc->digestfp, "Subject: %s\n", msg->cm_fields['U']);
 395                         }
 396
 397                         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 398
 399                         safestrncpy(CC->preferred_formats, "text/plain", sizeof CC->preferred_formats);
 400                         CtdlOutputPreLoadedMsg(msg, MT_CITADEL, HEADERS_NONE, 0, 0, 0);
 401
 402                         StrBufTrim(CC->redirect_buffer);
 403                         fwrite(HKEY("\n"), 1, sc->digestfp);
 404                         fwrite(SKEY(CC->redirect_buffer), 1, sc->digestfp);
 405                         fwrite(HKEY("\n"), 1, sc->digestfp);
 406
 407                         FreeStrBuf(&CC->redirect_buffer);
 408
 409                         sc->num_msgs_spooled += 1;
 410                         free(msg);
 411                 }
 412         }
 413
 414         /*
 415          * Process client-side list participations for this room
 416          */
 417         if (sc->participates != NULL) {
 418                 msg = CtdlFetchMessage(msgnum, 1);
 419                 if (msg != NULL) {
 420
 421                         /* Only send messages which originated on our own Citadel
 422                          * network, otherwise we'll end up sending the remote
 423                          * mailing list's messages back to it, which is rude...
 424                          */
 425                         ok_to_participate = 0;
 426                         if (msg->cm_fields['N'] != NULL) {
 427                                 if (!strcasecmp(msg->cm_fields['N'], config.c_nodename)) {
 428                                         ok_to_participate = 1;
 429                                 }
 430                                 if (is_valid_node(NULL, NULL, msg->cm_fields['N']) == 0) {
 431                                         ok_to_participate = 1;
 432                                 }
 433                         }
 434                         if (ok_to_participate) {
 435                                 if (msg->cm_fields['F'] != NULL) {
 436                                         free(msg->cm_fields['F']);
 437                                 }
 438                                 msg->cm_fields['F'] = malloc(SIZ);
 439                                 /* Replace the Internet email address of the actual
 440                                 * author with the email address of the room itself,
 441                                 * so the remote listserv doesn't reject us.
 442                                 * FIXME ... I want to be able to pick any address
 443                                 */
 444                                 snprintf(msg->cm_fields['F'], SIZ,
 445                                         "room_%s@%s", CC->room.QRname,
 446                                         config.c_fqdn);
 447                                 for (i=0; msg->cm_fields['F'][i]; ++i) {
 448                                         if (isspace(msg->cm_fields['F'][i])) {
 449                                                 msg->cm_fields['F'][i] = '_';
 450                                         }
 451                                 }
 452
 453                                 /*
 454                                  * Figure out how big a buffer we need to allocate
 455                                  */
 456                                 for (nptr = sc->participates; nptr != NULL; nptr = nptr->next) {
 457
 458                                         if (msg->cm_fields['R'] == NULL) {
 459                                                 free(msg->cm_fields['R']);
 460                                         }
 461                                         msg->cm_fields['R'] = strdup(nptr->name);
 462
 463                                         valid = validate_recipients(nptr->name, NULL, 0);
 464                                         CtdlSubmitMsg(msg, valid, "", 0);
 465                                         free_recipients(valid);
 466                                 }
 467
 468                         }
 469                         CtdlFreeMessage(msg);
 470                 }
 471         }
 472
 473         /*
 474          * Process IGnet push shares
 475          */
 476         msg = CtdlFetchMessage(msgnum, 1);
 477         if (msg != NULL) {
 478                 size_t newpath_len;
 479
 480                 /* Prepend our node name to the Path field whenever
 481                  * sending a message to another IGnet node
 482                  */
 483                 if (msg->cm_fields['P'] == NULL) {
 484                         msg->cm_fields['P'] = strdup("username");
 485                 }
 486                 newpath_len = strlen(msg->cm_fields['P']) +
 487                          strlen(config.c_nodename) + 2;
 488                 newpath = malloc(newpath_len);
 489                 snprintf(newpath, newpath_len, "%s!%s",
 490                          config.c_nodename, msg->cm_fields['P']);
 491                 free(msg->cm_fields['P']);
 492                 msg->cm_fields['P'] = newpath;
 493
 494                 /*
 495                  * Determine if this message is set to be deleted
 496                  * after sending out on the network
 497                  */
 498                 if (msg->cm_fields['S'] != NULL) {
 499                         if (!strcasecmp(msg->cm_fields['S'], "CANCEL")) {
 500                                 delete_after_send = 1;
 501                         }
 502                 }
 503
 504                 /* Now send it to every node */
 505                 if (sc->ignet_push_shares != NULL)
 506                   for (mptr = sc->ignet_push_shares; mptr != NULL;
 507                     mptr = mptr->next) {
 508
 509                         send = 1;
 510
 511                         /* Check for valid node name */
 512                         if (is_valid_node(NULL, NULL, mptr->remote_nodename) != 0) {
 513                                 syslog(LOG_ERR, "Invalid node <%s>\n", mptr->remote_nodename);
 514                                 send = 0;
 515                         }
 516
 517                         /* Check for split horizon */
 518                         syslog(LOG_DEBUG, "Path is %s\n", msg->cm_fields['P']);
 519                         bang = num_tokens(msg->cm_fields['P'], '!');
 520                         if (bang > 1) for (i=0; i<(bang-1); ++i) {
 521                                 extract_token(buf, msg->cm_fields['P'], i, '!', sizeof buf);
 522                                 syslog(LOG_DEBUG, "Compare <%s> to <%s>\n",
 523                                         buf, mptr->remote_nodename) ;
 524                                 if (!strcasecmp(buf, mptr->remote_nodename)) {
 525                                         send = 0;
 526                                         syslog(LOG_DEBUG, "Not sending to %s\n",
 527                                                 mptr->remote_nodename);
 528                                 }
 529                                 else {
 530                                         syslog(LOG_DEBUG, "Sending to %s\n", mptr->remote_nodename);
 531                                 }
 532                         }
 533
 534                         /* Send the message */
 535                         if (send == 1) {
 536
 537                                 /*
 538                                  * Force the message to appear in the correct room
 539                                  * on the far end by setting the C field correctly
 540                                  */
 541                                 if (msg->cm_fields['C'] != NULL) {
 542                                         free(msg->cm_fields['C']);
 543                                 }
 544                                 if (!IsEmptyStr(mptr->remote_roomname)) {
 545                                         msg->cm_fields['C'] = strdup(mptr->remote_roomname);
 546                                 }
 547                                 else {
 548                                         msg->cm_fields['C'] = strdup(CC->room.QRname);
 549                                 }
 550
 551                                 /* serialize it for transmission */
 552                                 serialize_message(&sermsg, msg);
 553                                 if (sermsg.len > 0) {
 554
 555                                         /* write it to a spool file */
 556                                         snprintf(filename, sizeof filename,"%s/%s@%lx%x",
 557                                                 ctdl_netout_dir,
 558                                                 mptr->remote_nodename,
 559                                                 time(NULL),
 560                                                 rand()
 561                                         );
 562                                         syslog(LOG_DEBUG, "Appending to %s\n", filename);
 563                                         fp = fopen(filename, "ab");
 564                                         if (fp != NULL) {
 565                                                 fwrite(sermsg.ser,
 566                                                         sermsg.len, 1, fp);
 567                                                 fclose(fp);
 568                                         }
 569                                         else {
 570                                                 syslog(LOG_ERR, "%s: %s\n", filename, strerror(errno));
 571                                         }
 572
 573                                         /* free the serialized version */
 574                                         free(sermsg.ser);
 575                                 }
 576
 577                         }
 578                 }
 579                 CtdlFreeMessage(msg);
 580         }
 581
 582         /* update lastsent */
 583         sc->lastsent = msgnum;
 584
 585         /* Delete this message if delete-after-send is set */
 586         if (delete_after_send) {
 587                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 588         }
 589
 590 }