citadel/modules/network/serv_netmail.c

   1 /*
   2  * This module handles network mail and mailing list processing.
   3  *
   4  * Copyright (c) 2000-2020 by the citadel.org team
   5  *
   6  * This program is open source software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, version 3.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  15  * This is a fairly high-level type of critical section.  It ensures that no
  16  * two threads work on the netconfigs files at the same time.  Since we do
  17  * so many things inside these, here are the rules:
  18  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  19  *  2. Do *not* perform any I/O with the client during these sections.
  20  *
  21  */
  22
  23 /*
  24  * Duration of time (in seconds) after which pending list subscribe/unsubscribe
  25  * requests that have not been confirmed will be deleted.
  26  */
  27 #define EXP     259200  /* three days */
  28
  29 #include "sysdep.h"
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <stdio.h>
  33 #include <fcntl.h>
  34 #include <ctype.h>
  35 #include <signal.h>
  36 #include <pwd.h>
  37 #include <errno.h>
  38 #include <sys/stat.h>
  39 #include <sys/types.h>
  40 #include <dirent.h>
  41 #if TIME_WITH_SYS_TIME
  42 # include <sys/time.h>
  43 # include <time.h>
  44 #else
  45 # if HAVE_SYS_TIME_H
  46 #  include <sys/time.h>
  47 # else
  48 #  include <time.h>
  49 # endif
  50 #endif
  51 #ifdef HAVE_SYSCALL_H
  52 # include <syscall.h>
  53 #else
  54 # if HAVE_SYS_SYSCALL_H
  55 #  include <sys/syscall.h>
  56 # endif
  57 #endif
  58
  59 #include <sys/wait.h>
  60 #include <string.h>
  61 #include <limits.h>
  62 #include <libcitadel.h>
  63 #include "citadel.h"
  64 #include "server.h"
  65 #include "citserver.h"
  66 #include "support.h"
  67 #include "config.h"
  68 #include "user_ops.h"
  69 #include "database.h"
  70 #include "msgbase.h"
  71 #include "internet_addressing.h"
  72 #include "serv_network.h"
  73 #include "clientsocket.h"
  74 #include "citadel_dirs.h"
  75 #include "threads.h"
  76 #include "context.h"
  77 #include "ctdl_module.h"
  78 #include "netspool.h"
  79 #include "netmail.h"
  80
  81 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc, const char *RoomName);
  82
  83 void aggregate_recipients(StrBuf **recps, RoomNetCfg Which, OneRoomNetCfg *OneRNCfg, long nSegments)
  84 {
  85         int i;
  86         size_t recps_len = 0;
  87         RoomNetCfgLine *nptr;
  88
  89         *recps = NULL;
  90         /*
  91          * Figure out how big a buffer we need to allocate
  92          */
  93         for (nptr = OneRNCfg->NetConfigs[Which]; nptr != NULL; nptr = nptr->next) {
  94                 recps_len = recps_len + StrLength(nptr->Value[0]) + 2;
  95         }
  96
  97         /* Nothing todo... */
  98         if (recps_len == 0)
  99                 return;
 100
 101         *recps = NewStrBufPlain(NULL, recps_len);
 102
 103         if (*recps == NULL) {
 104                 syslog(LOG_ERR, "netmail: cannot allocate %ld bytes for recps", (long)recps_len);
 105                 abort();
 106         }
 107
 108         /* Each recipient */
 109         for (nptr = OneRNCfg->NetConfigs[Which]; nptr != NULL; nptr = nptr->next) {
 110                 if (nptr != OneRNCfg->NetConfigs[Which]) {
 111                         for (i = 0; i < nSegments; i++)
 112                                 StrBufAppendBufPlain(*recps, HKEY(","), i);
 113                 }
 114                 StrBufAppendBuf(*recps, nptr->Value[0], 0);
 115                 if (Which == ignet_push_share)
 116                 {
 117                         StrBufAppendBufPlain(*recps, HKEY(","), 0);
 118                         StrBufAppendBuf(*recps, nptr->Value[1], 0);
 119
 120                 }
 121         }
 122 }
 123
 124 static void ListCalculateSubject(struct CtdlMessage *msg)
 125 {
 126         struct CitContext *CCC = CC;
 127         StrBuf *Subject, *FlatSubject;
 128         int rlen;
 129         char *pCh;
 130
 131         if (CM_IsEmpty(msg, eMsgSubject)) {
 132                 Subject = NewStrBufPlain(HKEY("(no subject)"));
 133         }
 134         else {
 135                 Subject = NewStrBufPlain(CM_KEY(msg, eMsgSubject));
 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         CM_SetAsFieldSB(msg, eMsgSubject, &Subject);
 163
 164         FreeStrBuf(&FlatSubject);
 165 }
 166
 167 /*
 168  * Deliver digest messages
 169  */
 170 void network_deliver_digest(SpoolControl *sc)
 171 {
 172         struct CitContext *CCC = CC;
 173         long len;
 174         char buf[SIZ];
 175         char *pbuf;
 176         struct CtdlMessage *msg = NULL;
 177         long msglen;
 178         recptypes *valid;
 179         char bounce_to[256];
 180
 181         if (sc->Users[digestrecp] == NULL)
 182                 return;
 183
 184         msg = malloc(sizeof(struct CtdlMessage));
 185         memset(msg, 0, sizeof(struct CtdlMessage));
 186         msg->cm_magic = CTDLMESSAGE_MAGIC;
 187         msg->cm_format_type = FMT_RFC822;
 188         msg->cm_anon_type = MES_NORMAL;
 189
 190         CM_SetFieldLONG(msg, eTimestamp, time(NULL));
 191         CM_SetField(msg, eAuthor, CCC->room.QRname, strlen(CCC->room.QRname));
 192         len = snprintf(buf, sizeof buf, "[%s]", CCC->room.QRname);
 193         CM_SetField(msg, eMsgSubject, buf, len);
 194
 195         CM_SetField(msg, erFc822Addr, SKEY(sc->Users[roommailalias]));
 196         CM_SetField(msg, eRecipient, SKEY(sc->Users[roommailalias]));
 197
 198         /* Set the 'List-ID' header */
 199         CM_SetField(msg, eListID, SKEY(sc->ListID));
 200
 201         /*
 202          * Go fetch the contents of the digest
 203          */
 204         fseek(sc->digestfp, 0L, SEEK_END);
 205         msglen = ftell(sc->digestfp);
 206
 207         pbuf = malloc(msglen + 1);
 208         fseek(sc->digestfp, 0L, SEEK_SET);
 209         fread(pbuf, (size_t)msglen, 1, sc->digestfp);
 210         pbuf[msglen] = '\0';
 211         CM_SetAsField(msg, eMesageText, &pbuf, msglen);
 212
 213         /* Now generate the delivery instructions */
 214
 215         /* Where do we want bounces and other noise to be heard?
 216          * Surely not the list members! */
 217         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", CtdlGetConfigStr("c_fqdn"));
 218
 219         /* Now submit the message */
 220         valid = validate_recipients(ChrPtr(sc->Users[digestrecp]), NULL, 0);
 221         if (valid != NULL) {
 222                 valid->bounce_to = strdup(bounce_to);
 223                 valid->envelope_from = strdup(bounce_to);
 224                 CtdlSubmitMsg(msg, valid, NULL, 0);
 225         }
 226         CM_Free(msg);
 227         free_recipients(valid);
 228 }
 229
 230
 231 void network_process_digest(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 232 {
 233
 234         struct CtdlMessage *msg = NULL;
 235
 236         if (sc->Users[digestrecp] == NULL)
 237                 return;
 238
 239         /* If there are digest recipients, we have to build a digest */
 240         if (sc->digestfp == NULL) {
 241
 242                 sc->digestfp = create_digest_file(&sc->room, 1);
 243
 244                 if (sc->digestfp == NULL)
 245                         return;
 246
 247                 sc->haveDigest = ftell(sc->digestfp) > 0;
 248                 if (!sc->haveDigest) {
 249                         fprintf(sc->digestfp, "Content-type: text/plain\n\n");
 250                 }
 251                 sc->haveDigest = 1;
 252         }
 253
 254         msg = CM_Duplicate(omsg);
 255         if (msg != NULL) {
 256                 sc->haveDigest = 1;
 257                 fprintf(sc->digestfp,
 258                         " -----------------------------------"
 259                         "------------------------------------"
 260                         "-------\n");
 261                 fprintf(sc->digestfp, "From: ");
 262                 if (!CM_IsEmpty(msg, eAuthor)) {
 263                         fprintf(sc->digestfp,
 264                                 "%s ",
 265                                 msg->cm_fields[eAuthor]);
 266                 }
 267                 if (!CM_IsEmpty(msg, erFc822Addr)) {
 268                         fprintf(sc->digestfp,
 269                                 "<%s> ",
 270                                 msg->cm_fields[erFc822Addr]);
 271                 }
 272                 fprintf(sc->digestfp, "\n");
 273                 if (!CM_IsEmpty(msg, eMsgSubject)) {
 274                         fprintf(sc->digestfp,
 275                                 "Subject: %s\n",
 276                                 msg->cm_fields[eMsgSubject]);
 277                 }
 278
 279                 CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 280
 281                 safestrncpy(CC->preferred_formats,
 282                             "text/plain",
 283                             sizeof CC->preferred_formats);
 284
 285                 CtdlOutputPreLoadedMsg(msg,
 286                                        MT_CITADEL,
 287                                        HEADERS_NONE,
 288                                        0, 0, 0);
 289
 290                 StrBufTrim(CC->redirect_buffer);
 291                 fwrite(HKEY("\n"), 1, sc->digestfp);
 292                 fwrite(SKEY(CC->redirect_buffer), 1, sc->digestfp);
 293                 fwrite(HKEY("\n"), 1, sc->digestfp);
 294
 295                 FreeStrBuf(&CC->redirect_buffer);
 296
 297                 sc->num_msgs_spooled += 1;
 298                 CM_Free(msg);
 299         }
 300 }
 301
 302
 303 void network_process_list(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 304 {
 305         struct CtdlMessage *msg = NULL;
 306
 307         /*
 308          * Process mailing list recipients
 309          */
 310         if (sc->Users[listrecp] == NULL)
 311                 return;
 312
 313         /* create our own copy of the message.
 314          *  We're going to need to modify it
 315          * in order to insert the [list name] in it, etc.
 316          */
 317
 318         msg = CM_Duplicate(omsg);
 319
 320
 321         CM_SetField(msg, eReplyTo, SKEY(sc->Users[roommailalias]));
 322
 323         /* if there is no other recipient, Set the recipient
 324          * of the list message to the email address of the
 325          * room itself.
 326          */
 327         if (CM_IsEmpty(msg, eRecipient))
 328         {
 329                 CM_SetField(msg, eRecipient, SKEY(sc->Users[roommailalias]));
 330         }
 331
 332         /* Set the 'List-ID' header */
 333         CM_SetField(msg, eListID, SKEY(sc->ListID));
 334
 335
 336         /* Prepend "[List name]" to the subject */
 337         ListCalculateSubject(msg);
 338
 339         /* Handle delivery */
 340         network_deliver_list(msg, sc, CC->room.QRname);
 341         CM_Free(msg);
 342 }
 343
 344 /*
 345  * Deliver list messages to everyone on the list ... efficiently
 346  */
 347 void network_deliver_list(struct CtdlMessage *msg, SpoolControl *sc, const char *RoomName)
 348 {
 349         recptypes *valid;
 350         char bounce_to[256];
 351
 352         /* Don't do this if there were no recipients! */
 353         if (sc->Users[listrecp] == NULL)
 354                 return;
 355
 356         /* Now generate the delivery instructions */
 357
 358         /* Where do we want bounces and other noise to be heard?
 359          *  Surely not the list members! */
 360         snprintf(bounce_to, sizeof bounce_to, "room_aide@%s", CtdlGetConfigStr("c_fqdn"));
 361
 362         /* Now submit the message */
 363         valid = validate_recipients(ChrPtr(sc->Users[listrecp]), NULL, 0);
 364         if (valid != NULL) {
 365                 valid->bounce_to = strdup(bounce_to);
 366                 valid->envelope_from = strdup(bounce_to);
 367                 valid->sending_room = strdup(RoomName);
 368                 CtdlSubmitMsg(msg, valid, NULL, 0);
 369                 free_recipients(valid);
 370         }
 371         /* Do not call CM_Free(msg) here; the caller will free it. */
 372 }
 373
 374
 375 void network_process_participate(SpoolControl *sc, struct CtdlMessage *omsg, long *delete_after_send)
 376 {
 377         struct CtdlMessage *msg = NULL;
 378         int ok_to_participate = 0;
 379         recptypes *valid;
 380
 381         /*
 382          * Process client-side list participations for this room
 383          */
 384         if (sc->Users[participate] == NULL)
 385                 return;
 386
 387         msg = CM_Duplicate(omsg);
 388
 389         /* Only send messages which originated on our own
 390          * Citadel network, otherwise we'll end up sending the
 391          * remote mailing list's messages back to it, which
 392          * is rude...
 393          */
 394         ok_to_participate = 0;
 395
 396         // FIXME -- After we removed CitaNet/IGnet support , we now need a new heuristic to determine
 397         // whether a message originated locally.  This means the "participate" mode no longer works.
 398         // We'll definitely need to refactor this when we do other federated stuff later.
 399
 400         if (ok_to_participate)
 401         {
 402                 /* Replace the Internet email address of the
 403                  * actual author with the email address of the
 404                  * room itself, so the remote listserv doesn't
 405                  * reject us.
 406                  */
 407                 CM_SetField(msg, erFc822Addr, SKEY(sc->Users[roommailalias]));
 408
 409                 valid = validate_recipients(ChrPtr(sc->Users[participate]) , NULL, 0);
 410
 411                 CM_SetField(msg, eRecipient, SKEY(sc->Users[roommailalias]));
 412                 CtdlSubmitMsg(msg, valid, "", 0);
 413                 free_recipients(valid);
 414         }
 415         CM_Free(msg);
 416 }
 417
 418
 419 /*
 420  * Spools out one message from the list.
 421  */
 422 void network_spool_msg(long msgnum, void *userdata)
 423 {
 424         struct CtdlMessage *msg = NULL;
 425         long delete_after_send = 0;     /* Set to 1 to delete after spooling */
 426         SpoolControl *sc;
 427
 428         sc = (SpoolControl *)userdata;
 429         msg = CtdlFetchMessage(msgnum, 1, 1);
 430
 431         if (msg == NULL)
 432         {
 433                 syslog(LOG_ERR, "netmail: failed to load Message <%ld> from disk", msgnum);
 434                 return;
 435         }
 436         network_process_list(sc, msg, &delete_after_send);
 437         network_process_digest(sc, msg, &delete_after_send);
 438         network_process_participate(sc, msg, &delete_after_send);
 439
 440         CM_Free(msg);
 441
 442         /* update lastsent */
 443         sc->lastsent = msgnum;
 444
 445         /* Delete this message if delete-after-send is set */
 446         if (delete_after_send) {
 447                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 448         }
 449 }