citadel/serv_listsub.c

   1 /*
   2  * $Id$
   3  *
   4  * This module handles self-service subscription/unsubscription to mail lists.
   5  *
   6  * Copyright (C) 2002 by Art Cancro and others.
   7  * This code is released under the terms of the GNU General Public License.
   8  *
   9  */
  10
  11 #include "sysdep.h"
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <stdio.h>
  15 #include <fcntl.h>
  16 #include <ctype.h>
  17 #include <signal.h>
  18 #include <pwd.h>
  19 #include <errno.h>
  20 #include <sys/types.h>
  21 #include <dirent.h>
  22 #if TIME_WITH_SYS_TIME
  23 # include <sys/time.h>
  24 # include <time.h>
  25 #else
  26 # if HAVE_SYS_TIME_H
  27 #  include <sys/time.h>
  28 # else
  29 #  include <time.h>
  30 # endif
  31 #endif
  32
  33 #include <sys/wait.h>
  34 #include <string.h>
  35 #include <limits.h>
  36 #include "citadel.h"
  37 #include "server.h"
  38 #include "sysdep_decls.h"
  39 #include "citserver.h"
  40 #include "support.h"
  41 #include "config.h"
  42 #include "serv_extensions.h"
  43 #include "room_ops.h"
  44 #include "user_ops.h"
  45 #include "policy.h"
  46 #include "database.h"
  47 #include "msgbase.h"
  48 #include "tools.h"
  49 #include "internet_addressing.h"
  50 #include "serv_network.h"
  51 #include "clientsocket.h"
  52 #include "file_ops.h"
  53
  54 #ifndef HAVE_SNPRINTF
  55 #include "snprintf.h"
  56 #endif
  57
  58
  59 /*
  60  * Generate a randomizationalisticized token to use for authentication of
  61  * a subscribe or unsubscribe request.
  62  */
  63 void listsub_generate_token(char *buf) {
  64         char sourcebuf[SIZ];
  65         static int seq = 0;
  66
  67         /* Theo, please sit down and shut up.  This key doesn't have to be
  68          * tinfoil-hat secure, it just needs to be reasonably unguessable
  69          * and unique.
  70          */
  71         sprintf(sourcebuf, "%lx",
  72                 (long) (++seq + getpid() + time(NULL))
  73         );
  74
  75         /* Convert it to base64 so it looks cool */
  76         CtdlEncodeBase64(buf, sourcebuf, strlen(sourcebuf));
  77 }
  78
  79
  80 /*
  81  * Enter a subscription request
  82  */
  83 void do_subscribe(char *room, char *email, char *subtype, char *webpage) {
  84         struct ctdlroom qrbuf;
  85         FILE *ncfp;
  86         char filename[SIZ];
  87         char token[SIZ];
  88         char confirmation_request[SIZ];
  89         char buf[SIZ];
  90         char urlroom[SIZ];
  91         char scancmd[SIZ];
  92         char scanemail[SIZ];
  93         int found_sub = 0;
  94
  95         if (getroom(&qrbuf, room) != 0) {
  96                 cprintf("%d There is no list called '%s'\n", ERROR, room);
  97                 return;
  98         }
  99
 100         if ((qrbuf.QRflags2 & QR2_SELFLIST) == 0) {
 101                 cprintf("%d '%s' "
 102                         "does not accept subscribe/unsubscribe requests.\n",
 103                         ERROR+HIGHER_ACCESS_REQUIRED, qrbuf.QRname);
 104                 return;
 105         }
 106
 107         listsub_generate_token(token);
 108
 109         assoc_file_name(filename, sizeof filename, &qrbuf, "netconfigs");
 110
 111         /*
 112          * Make sure the requested address isn't already subscribed
 113          */
 114         begin_critical_section(S_NETCONFIGS);
 115         ncfp = fopen(filename, "r");
 116         if (ncfp != NULL) {
 117                 while (fgets(buf, sizeof buf, ncfp) != NULL) {
 118                         buf[strlen(buf)-1] = 0;
 119                         extract(scancmd, buf, 0);
 120                         extract(scanemail, buf, 1);
 121                         if ((!strcasecmp(scancmd, "listrecp"))
 122                            || (!strcasecmp(scancmd, "digestrecp"))) {
 123                                 if (!strcasecmp(scanemail, email)) {
 124                                         ++found_sub;
 125                                 }
 126                         }
 127                 }
 128                 fclose(ncfp);
 129         }
 130         end_critical_section(S_NETCONFIGS);
 131
 132         if (found_sub != 0) {
 133                 cprintf("%d '%s' is already subscribed to '%s'.\n",
 134                         ERROR,
 135                         email, qrbuf.QRname);
 136                 return;
 137         }
 138
 139         /*
 140          * Now add it to the file
 141          */
 142         begin_critical_section(S_NETCONFIGS);
 143         ncfp = fopen(filename, "a");
 144         if (ncfp != NULL) {
 145                 fprintf(ncfp, "subpending|%s|%s|%s|%ld|%s\n",
 146                         email,
 147                         subtype,
 148                         token,
 149                         time(NULL),
 150                         webpage
 151                 );
 152                 fclose(ncfp);
 153         }
 154         end_critical_section(S_NETCONFIGS);
 155
 156         /* Generate and send the confirmation request */
 157
 158         urlesc(urlroom, qrbuf.QRname);
 159
 160         snprintf(confirmation_request, sizeof confirmation_request,
 161                 "Content-type: text/html\n\n"
 162                 "<HTML><BODY>"
 163                 "Someone (probably you) has submitted a request to subscribe\n"
 164                 "&lt;%s&gt; to the <B>%s</B> mailing list.<BR><BR>\n"
 165                 "Please click here to confirm this request:<BR>\n"
 166                 "<A HREF=\"http://%s?room=%s&token=%s&cmd=confirm\">"
 167                 "http://%s?room=%s&token=%s&cmd=confirm</A><BR><BR>\n"
 168                 "If this request has been submitted in error and you do not\n"
 169                 "wish to receive the '%s' mailing list, simply do nothing,\n"
 170                 "and you will not receive any further mailings.\n"
 171                 "</BODY></HTML>\n",
 172
 173                 email, qrbuf.QRname,
 174                 webpage, urlroom, token,
 175                 webpage, urlroom, token,
 176                 qrbuf.QRname
 177         );
 178
 179         quickie_message(        /* This delivers the message */
 180                 "Citadel",
 181                 email,
 182                 NULL,
 183                 confirmation_request,
 184                 FMT_RFC822,
 185                 "Please confirm your list subscription"
 186         );
 187
 188         cprintf("%d Subscription entered; confirmation request sent\n", CIT_OK);
 189 }
 190
 191
 192 /*
 193  * Enter an unsubscription request
 194  */
 195 void do_unsubscribe(char *room, char *email, char *webpage) {
 196         struct ctdlroom qrbuf;
 197         FILE *ncfp;
 198         char filename[SIZ];
 199         char token[SIZ];
 200         char buf[SIZ];
 201         char confirmation_request[SIZ];
 202         char urlroom[SIZ];
 203         char scancmd[SIZ];
 204         char scanemail[SIZ];
 205         int found_sub = 0;
 206
 207         if (getroom(&qrbuf, room) != 0) {
 208                 cprintf("%d There is no list called '%s'\n",
 209                         ERROR+ROOM_NOT_FOUND, room);
 210                 return;
 211         }
 212
 213         if ((qrbuf.QRflags2 & QR2_SELFLIST) == 0) {
 214                 cprintf("%d '%s' "
 215                         "does not accept subscribe/unsubscribe requests.\n",
 216                         ERROR+HIGHER_ACCESS_REQUIRED, qrbuf.QRname);
 217                 return;
 218         }
 219
 220         listsub_generate_token(token);
 221
 222         assoc_file_name(filename, sizeof filename, &qrbuf, "netconfigs");
 223
 224         /*
 225          * Make sure there's actually a subscription there to remove
 226          */
 227         begin_critical_section(S_NETCONFIGS);
 228         ncfp = fopen(filename, "r");
 229         if (ncfp != NULL) {
 230                 while (fgets(buf, sizeof buf, ncfp) != NULL) {
 231                         buf[strlen(buf)-1] = 0;
 232                         extract(scancmd, buf, 0);
 233                         extract(scanemail, buf, 1);
 234                         if ((!strcasecmp(scancmd, "listrecp"))
 235                            || (!strcasecmp(scancmd, "digestrecp"))) {
 236                                 if (!strcasecmp(scanemail, email)) {
 237                                         ++found_sub;
 238                                 }
 239                         }
 240                 }
 241                 fclose(ncfp);
 242         }
 243         end_critical_section(S_NETCONFIGS);
 244
 245         if (found_sub == 0) {
 246                 cprintf("%d '%s' is not subscribed to '%s'.\n",
 247                         ERROR+NO_SUCH_USER,
 248                         email, qrbuf.QRname);
 249                 return;
 250         }
 251
 252         /*
 253          * Ok, now enter the unsubscribe-pending entry.
 254          */
 255         begin_critical_section(S_NETCONFIGS);
 256         ncfp = fopen(filename, "a");
 257         if (ncfp != NULL) {
 258                 fprintf(ncfp, "unsubpending|%s|%s|%ld|%s\n",
 259                         email,
 260                         token,
 261                         time(NULL),
 262                         webpage
 263                 );
 264                 fclose(ncfp);
 265         }
 266         end_critical_section(S_NETCONFIGS);
 267
 268         /* Generate and send the confirmation request */
 269
 270         urlesc(urlroom, qrbuf.QRname);
 271
 272         snprintf(confirmation_request, sizeof confirmation_request,
 273                 "Content-type: text/html\n\n"
 274                 "<HTML><BODY>"
 275                 "Someone (probably you) has submitted a request "
 276                 "to unsubscribe\n"
 277                 "&lt;%s&gt; from the <B>%s</B> mailing list.<BR><BR>\n"
 278                 "Please click here to confirm this request:<BR>\n"
 279                 "<A HREF=\"http://%s?room=%s&token=%s&cmd=confirm\">"
 280                 "http://%s?room=%s&token=%s&cmd=confirm</A><BR><BR>\n"
 281                 "If this request has been submitted in error and you do\n"
 282                 "<i>not</i> wish to unsubscribe from the "
 283                 "'%s' mailing list, simply do nothing,\n"
 284                 "and you will remain subscribed to the list.\n"
 285                 "</BODY></HTML>\n",
 286
 287                 email, qrbuf.QRname,
 288                 webpage, urlroom, token,
 289                 webpage, urlroom, token,
 290                 qrbuf.QRname
 291         );
 292
 293         quickie_message(        /* This delivers the message */
 294                 "Citadel",
 295                 email,
 296                 NULL,
 297                 confirmation_request,
 298                 FMT_RFC822,
 299                 "Please confirm your unsubscribe request"
 300         );
 301
 302         cprintf("%d Unubscription noted; confirmation request sent\n", CIT_OK);
 303 }
 304
 305
 306 /*
 307  * Confirm a subscribe/unsubscribe request.
 308  */
 309 void do_confirm(char *room, char *token) {
 310         struct ctdlroom qrbuf;
 311         FILE *ncfp;
 312         char filename[SIZ];
 313         char line_token[SIZ];
 314         long line_offset;
 315         int line_length;
 316         char buf[SIZ];
 317         char cmd[SIZ];
 318         char email[SIZ];
 319         char subtype[SIZ];
 320         int success = 0;
 321         char address_to_unsubscribe[SIZ];
 322         char scancmd[SIZ];
 323         char scanemail[SIZ];
 324         char *holdbuf = NULL;
 325         int linelen = 0;
 326         int buflen = 0;
 327
 328         strcpy(address_to_unsubscribe, "");
 329
 330         if (getroom(&qrbuf, room) != 0) {
 331                 cprintf("%d There is no list called '%s'\n",
 332                         ERROR+ROOM_NOT_FOUND, room);
 333                 return;
 334         }
 335
 336         if ((qrbuf.QRflags2 & QR2_SELFLIST) == 0) {
 337                 cprintf("%d '%s' "
 338                         "does not accept subscribe/unsubscribe requests.\n",
 339                         ERROR+HIGHER_ACCESS_REQUIRED, qrbuf.QRname);
 340                 return;
 341         }
 342
 343         /*
 344          * Now start scanning this room's netconfig file for the
 345          * specified token.
 346          */
 347         assoc_file_name(filename, sizeof filename, &qrbuf, "netconfigs");
 348         begin_critical_section(S_NETCONFIGS);
 349         ncfp = fopen(filename, "r+");
 350         if (ncfp != NULL) {
 351                 while (line_offset = ftell(ncfp),
 352                       (fgets(buf, sizeof buf, ncfp) != NULL) ) {
 353                         buf[strlen(buf)-1] = 0;
 354                         line_length = strlen(buf);
 355                         extract(cmd, buf, 0);
 356                         if (!strcasecmp(cmd, "subpending")) {
 357                                 extract(email, buf, 1);
 358                                 extract(subtype, buf, 2);
 359                                 extract(line_token, buf, 3);
 360                                 if (!strcasecmp(token, line_token)) {
 361                                         if (!strcasecmp(subtype, "digest")) {
 362                                                 strcpy(buf, "digestrecp|");
 363                                         }
 364                                         else {
 365                                                 strcpy(buf, "listrecp|");
 366                                         }
 367                                         strcat(buf, email);
 368                                         strcat(buf, "|");
 369                                         /* SLEAZY HACK: pad the line out so
 370                                          * it's the same length as the line
 371                                          * we're replacing.
 372                                          */
 373                                         while (strlen(buf) < line_length) {
 374                                                 strcat(buf, " ");
 375                                         }
 376                                         fseek(ncfp, line_offset, SEEK_SET);
 377                                         fprintf(ncfp, "%s\n", buf);
 378                                         ++success;
 379                                 }
 380                         }
 381                         if (!strcasecmp(cmd, "unsubpending")) {
 382                                 extract(line_token, buf, 2);
 383                                 if (!strcasecmp(token, line_token)) {
 384                                         extract(address_to_unsubscribe, buf, 1);
 385                                 }
 386                         }
 387                 }
 388                 fclose(ncfp);
 389         }
 390         end_critical_section(S_NETCONFIGS);
 391
 392         /*
 393          * If "address_to_unsubscribe" contains something, then we have to
 394          * make another pass at the file, stripping out lines referring to
 395          * that address.
 396          */
 397         if (strlen(address_to_unsubscribe) > 0) {
 398                 holdbuf = mallok(SIZ);
 399                 begin_critical_section(S_NETCONFIGS);
 400                 ncfp = fopen(filename, "r+");
 401                 if (ncfp != NULL) {
 402                         while (line_offset = ftell(ncfp),
 403                               (fgets(buf, sizeof buf, ncfp) != NULL) ) {
 404                                 buf[strlen(buf)-1]=0;
 405                                 extract(scancmd, buf, 0);
 406                                 extract(scanemail, buf, 1);
 407                                 if ( (!strcasecmp(scancmd, "listrecp"))
 408                                    && (!strcasecmp(scanemail,
 409                                                 address_to_unsubscribe)) ) {
 410                                         ++success;
 411                                 }
 412                                 else if ( (!strcasecmp(scancmd, "digestrecp"))
 413                                    && (!strcasecmp(scanemail,
 414                                                 address_to_unsubscribe)) ) {
 415                                         ++success;
 416                                 }
 417                                 else if ( (!strcasecmp(scancmd, "subpending"))
 418                                    && (!strcasecmp(scanemail,
 419                                                 address_to_unsubscribe)) ) {
 420                                         ++success;
 421                                 }
 422                                 else if ( (!strcasecmp(scancmd, "unsubpending"))
 423                                    && (!strcasecmp(scanemail,
 424                                                 address_to_unsubscribe)) ) {
 425                                         ++success;
 426                                 }
 427                                 else {  /* Not relevant, so *keep* it! */
 428                                         linelen = strlen(buf);
 429                                         holdbuf = reallok(holdbuf,
 430                                                 (buflen + linelen + 2) );
 431                                         strcpy(&holdbuf[buflen], buf);
 432                                         buflen += linelen;
 433                                         strcpy(&holdbuf[buflen], "\n");
 434                                         buflen += 1;
 435                                 }
 436                         }
 437                         fclose(ncfp);
 438                 }
 439                 ncfp = fopen(filename, "w");
 440                 if (ncfp != NULL) {
 441                         fwrite(holdbuf, buflen+1, 1, ncfp);
 442                         fclose(ncfp);
 443                 }
 444                 end_critical_section(S_NETCONFIGS);
 445                 phree(holdbuf);
 446         }
 447
 448         /*
 449          * Did we do anything useful today?
 450          */
 451         if (success) {
 452                 cprintf("%d %d operation(s) confirmed.\n", CIT_OK, success);
 453         }
 454         else {
 455                 cprintf("%d Invalid token.\n", ERROR);
 456         }
 457
 458 }
 459
 460
 461
 462 /*
 463  * process subscribe/unsubscribe requests and confirmations
 464  */
 465 void cmd_subs(char *cmdbuf) {
 466
 467         char opr[SIZ];
 468         char room[SIZ];
 469         char email[SIZ];
 470         char subtype[SIZ];
 471         char token[SIZ];
 472         char webpage[SIZ];
 473
 474         extract(opr, cmdbuf, 0);
 475         if (!strcasecmp(opr, "subscribe")) {
 476                 extract(subtype, cmdbuf, 3);
 477                 if ( (strcasecmp(subtype, "list"))
 478                    && (strcasecmp(subtype, "digest")) ) {
 479                         cprintf("%d Invalid subscription type '%s'\n",
 480                                 ERROR+ILLEGAL_VALUE, subtype);
 481                 }
 482                 else {
 483                         extract(room, cmdbuf, 1);
 484                         extract(email, cmdbuf, 2);
 485                         extract(webpage, cmdbuf, 4);
 486                         do_subscribe(room, email, subtype, webpage);
 487                 }
 488         }
 489         else if (!strcasecmp(opr, "unsubscribe")) {
 490                 extract(room, cmdbuf, 1);
 491                 extract(email, cmdbuf, 2);
 492                 extract(webpage, cmdbuf, 3);
 493                 do_unsubscribe(room, email, webpage);
 494         }
 495         else if (!strcasecmp(opr, "confirm")) {
 496                 extract(room, cmdbuf, 1);
 497                 extract(token, cmdbuf, 2);
 498                 do_confirm(room, token);
 499         }
 500         else {
 501                 cprintf("%d Invalid command\n", ERROR);
 502         }
 503 }
 504
 505
 506 /*
 507  * Module entry point
 508  */
 509 char *serv_listsub_init(void)
 510 {
 511         CtdlRegisterProtoHook(cmd_subs, "SUBS", "List subscribe/unsubscribe");
 512         return "$Id$";
 513 }