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 "dynloader.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, "%d%d%ld",
  72                 ++seq,
  73                 getpid(),
  74                 time(NULL)
  75         );
  76
  77         /* Convert it to base64 so it looks cool */
  78         encode_base64(buf, sourcebuf);
  79 }
  80
  81
  82 /*
  83  * Enter a subscription request
  84  */
  85 void do_subscribe(char *room, char *email, char *subtype) {
  86         struct quickroom qrbuf;
  87         FILE *ncfp;
  88         char filename[SIZ];
  89         char token[SIZ];
  90
  91         if (getroom(&qrbuf, room) != 0) {
  92                 cprintf("%d There is no list called '%s'\n", ERROR, room);
  93                 return;
  94         }
  95
  96         listsub_generate_token(token);
  97
  98         begin_critical_section(S_NETCONFIGS);
  99         assoc_file_name(filename, sizeof filename, &qrbuf, "netconfigs");
 100         ncfp = fopen(filename, "a");
 101         if (ncfp != NULL) {
 102                 fprintf(ncfp, "subpending|%s|%s|%s|%ld\n",
 103                         email,
 104                         subtype,
 105                         token,
 106                         time(NULL)
 107                 );
 108                 fclose(ncfp);
 109         }
 110         end_critical_section(S_NETCONFIGS);
 111
 112         /* FIXME  --  generate and send the confirmation request */
 113
 114         cprintf("%d Subscription entered; confirmation request sent\n", CIT_OK);
 115
 116 }
 117
 118
 119 /*
 120  * Confirm a subscribe/unsubscribe request.
 121  */
 122 void do_confirm(char *room, char *token) {
 123         struct quickroom qrbuf;
 124         FILE *ncfp;
 125         char filename[SIZ];
 126         char line_token[SIZ];
 127         long line_offset;
 128         int line_length;
 129         char buf[SIZ];
 130         char cmd[SIZ];
 131         char email[SIZ];
 132         char subtype[SIZ];
 133         int success = 0;
 134
 135         if (getroom(&qrbuf, room) != 0) {
 136                 cprintf("%d There is no list called '%s'\n", ERROR, room);
 137                 return;
 138         }
 139
 140         begin_critical_section(S_NETCONFIGS);
 141         assoc_file_name(filename, sizeof filename, &qrbuf, "netconfigs");
 142         ncfp = fopen(filename, "r+");
 143         if (ncfp != NULL) {
 144                 while (line_offset = ftell(ncfp),
 145                       (fgets(buf, sizeof buf, ncfp) != NULL) ) {
 146                         buf[strlen(buf)-1] = 0;
 147                         line_length = strlen(buf);
 148                         extract(cmd, buf, 0);
 149                         if (!strcasecmp(cmd, "subpending")) {
 150                                 extract(email, buf, 1);
 151                                 extract(subtype, buf, 2);
 152                                 extract(line_token, buf, 3);
 153                                 if (!strcasecmp(token, line_token)) {
 154                                         if (!strcasecmp(subtype, "digest")) {
 155                                                 strcpy(buf, "digestrecp|");
 156                                         }
 157                                         else {
 158                                                 strcpy(buf, "listrecp|");
 159                                         }
 160                                         strcat(buf, email);
 161                                         strcat(buf, "|");
 162                                         /* SLEAZY HACK: pad the line out so
 163                                          * it's the same length as the line
 164                                          * we're replacing.
 165                                          */
 166                                         while (strlen(buf) < line_length) {
 167                                                 strcat(buf, " ");
 168                                         }
 169                                         fseek(ncfp, line_offset, SEEK_SET);
 170                                         fprintf(ncfp, "%s\n", buf);
 171                                         ++success;
 172                                 }
 173                         }
 174                 }
 175                 fclose(ncfp);
 176         }
 177         end_critical_section(S_NETCONFIGS);
 178
 179         if (success) {
 180                 cprintf("%d %d operation(s) confirmed.\n", CIT_OK, success);
 181         }
 182         else {
 183                 cprintf("%d Invalid token.\n", ERROR);
 184         }
 185
 186 }
 187
 188
 189
 190 /*
 191  * process subscribe/unsubscribe requests and confirmations
 192  */
 193 void cmd_subs(char *cmdbuf) {
 194
 195         char opr[SIZ];
 196         char room[SIZ];
 197         char email[SIZ];
 198         char subtype[SIZ];
 199         char token[SIZ];
 200
 201         extract(opr, cmdbuf, 0);
 202         if (!strcasecmp(opr, "subscribe")) {
 203                 extract(subtype, cmdbuf, 3);
 204                 if ( (strcasecmp(subtype, "list"))
 205                    && (strcasecmp(subtype, "digest")) ) {
 206                         cprintf("%d Invalid subscription type.\n", ERROR);
 207                 }
 208                 else {
 209                         extract(room, cmdbuf, 1);
 210                         extract(email, cmdbuf, 2);
 211                         do_subscribe(room, email, subtype);
 212                 }
 213         }
 214         else if (!strcasecmp(opr, "unsubscribe")) {
 215                 cprintf("%d not yet implemented\n", ERROR);
 216         }
 217         else if (!strcasecmp(opr, "confirm")) {
 218                 extract(room, cmdbuf, 1);
 219                 extract(token, cmdbuf, 2);
 220                 do_confirm(room, token);
 221         }
 222         else {
 223                 cprintf("%d Invalid command\n", ERROR);
 224         }
 225 }
 226
 227
 228 /*
 229  * Module entry point
 230  */
 231 char *Dynamic_Module_Init(void)
 232 {
 233         CtdlRegisterProtoHook(cmd_subs, "SUBS", "List subscribe/unsubscribe");
 234         return "$Id$";
 235 }