citadel/serv_chat.c

   1 /*
   2  * serv_chat.c
   3  *
   4  * This module handles all "real time" communication between users.  The
   5  * modes of communication currently supported are Chat and Paging.
   6  *
   7  * $Id$
   8  */
   9 #include "sysdep.h"
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12 #include <stdio.h>
  13 #include <fcntl.h>
  14 #include <signal.h>
  15 #include <pwd.h>
  16 #include <errno.h>
  17 #include <sys/types.h>
  18 #include <sys/time.h>
  19 #include <sys/wait.h>
  20 #include <string.h>
  21 #include <limits.h>
  22 #include "citadel.h"
  23 #include "server.h"
  24 #include <syslog.h>
  25 #include "serv_chat.h"
  26 #include "sysdep_decls.h"
  27 #include "citserver.h"
  28 #include "support.h"
  29 #include "config.h"
  30 #include "dynloader.h"
  31 #include "tools.h"
  32 #include "msgbase.h"
  33
  34 struct ChatLine *ChatQueue = NULL;
  35 int ChatLastMsg = 0;
  36
  37 extern struct CitContext *ContextList;
  38
  39
  40
  41 char *Dynamic_Module_Init(void)
  42 {
  43         CtdlRegisterProtoHook(cmd_chat, "CHAT", "Begin real-time chat");
  44         CtdlRegisterProtoHook(cmd_pexp, "PEXP", "Poll for express messages");
  45         CtdlRegisterProtoHook(cmd_gexp, "GEXP", "Get express messages");
  46         CtdlRegisterProtoHook(cmd_sexp, "SEXP", "Send an express message");
  47         CtdlRegisterSessionHook(delete_express_messages, EVT_STOP);
  48         CtdlRegisterXmsgHook(send_express_message, XMSG_PRI_LOCAL);
  49         return "$Id$";
  50 }
  51
  52 void allwrite(char *cmdbuf, int flag, char *roomname, char *username)
  53 {
  54         FILE *fp;
  55         char bcast[256];
  56         char *un;
  57         struct ChatLine *clptr, *clnew;
  58         time_t now;
  59
  60         if (CC->fake_username[0])
  61                 un = CC->fake_username;
  62         else
  63                 un = CC->usersupp.fullname;
  64         if (flag == 1) {
  65                 snprintf(bcast, sizeof bcast, ":|<%s %s>", un, cmdbuf);
  66         } else if (flag == 0) {
  67                 snprintf(bcast, sizeof bcast, "%s|%s", un, cmdbuf);
  68         } else if (flag == 2) {
  69                 snprintf(bcast, sizeof bcast, ":|<%s whispers %s>", un, cmdbuf);
  70         }
  71         if ((strcasecmp(cmdbuf, "NOOP")) && (flag != 2)) {
  72                 fp = fopen(CHATLOG, "a");
  73                 fprintf(fp, "%s\n", bcast);
  74                 fclose(fp);
  75         }
  76         clnew = (struct ChatLine *) mallok(sizeof(struct ChatLine));
  77         memset(clnew, 0, sizeof(struct ChatLine));
  78         if (clnew == NULL) {
  79                 fprintf(stderr, "citserver: cannot alloc chat line: %s\n",
  80                         strerror(errno));
  81                 return;
  82         }
  83         time(&now);
  84         clnew->next = NULL;
  85         clnew->chat_time = now;
  86         safestrncpy(clnew->chat_room, roomname, sizeof clnew->chat_room);
  87         clnew->chat_room[sizeof clnew->chat_room - 1] = 0;
  88         if (username) {
  89                 safestrncpy(clnew->chat_username, username,
  90                         sizeof clnew->chat_username);
  91                 clnew->chat_username[sizeof clnew->chat_username - 1] = 0;
  92         } else
  93                 clnew->chat_username[0] = '\0';
  94         safestrncpy(clnew->chat_text, bcast, sizeof clnew->chat_text);
  95
  96         /* Here's the critical section.
  97          * First, add the new message to the queue...
  98          */
  99         begin_critical_section(S_CHATQUEUE);
 100         ++ChatLastMsg;
 101         clnew->chat_seq = ChatLastMsg;
 102         if (ChatQueue == NULL) {
 103                 ChatQueue = clnew;
 104         } else {
 105                 for (clptr = ChatQueue; clptr->next != NULL; clptr = clptr->next);;
 106                 clptr->next = clnew;
 107         }
 108
 109         /* Then, before releasing the lock, free the expired messages */
 110         while (1) {
 111                 if (ChatQueue == NULL)
 112                         goto DONE_FREEING;
 113                 if ((now - ChatQueue->chat_time) < 120L)
 114                         goto DONE_FREEING;
 115                 clptr = ChatQueue;
 116                 ChatQueue = ChatQueue->next;
 117                 phree(clptr);
 118         }
 119 DONE_FREEING:
 120         end_critical_section(S_CHATQUEUE);
 121 }
 122
 123
 124 t_context *find_context(char **unstr)
 125 {
 126         t_context *t_cc, *found_cc = NULL;
 127         char *name, *tptr;
 128
 129         if ((!*unstr) || (!unstr))
 130                 return (NULL);
 131
 132         begin_critical_section(S_SESSION_TABLE);
 133         for (t_cc = ContextList; ((t_cc) && (!found_cc)); t_cc = t_cc->next) {
 134                 if (t_cc->fake_username[0])
 135                         name = t_cc->fake_username;
 136                 else
 137                         name = t_cc->curr_user;
 138                 tptr = *unstr;
 139                 if ((!strncasecmp(name, tptr, strlen(name))) && (tptr[strlen(name)] == ' ')) {
 140                         found_cc = t_cc;
 141                         *unstr = &(tptr[strlen(name) + 1]);
 142                 }
 143         }
 144         end_critical_section(S_SESSION_TABLE);
 145
 146         return (found_cc);
 147 }
 148
 149 /*
 150  * List users in chat.
 151  * allflag ==   0 = list users in chat
 152  *              1 = list users in chat, followed by users not in chat
 153  *              2 = display count only
 154  */
 155
 156 void do_chat_listing(int allflag)
 157 {
 158         struct CitContext *ccptr;
 159         int count = 0;
 160         char roomname[ROOMNAMELEN];
 161
 162         if ((allflag == 0) || (allflag == 1))
 163                 cprintf(":|\n:| Users currently in chat:\n");
 164         begin_critical_section(S_SESSION_TABLE);
 165         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 166                 if (ccptr->cs_flags & CS_CHAT) ++count;
 167                 if ((ccptr->cs_flags & CS_CHAT)
 168                     && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 169                         if ((allflag == 0) || (allflag == 1))
 170                                 cprintf(":| %-25s <%s>\n", (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user, ccptr->chat_room);
 171                 }
 172         }
 173
 174         if (allflag == 1) {
 175                 cprintf(":|\n:| Users not in chat:\n");
 176                 for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 177                         GenerateRoomDisplay(roomname, ccptr, CC);
 178                         if (((ccptr->cs_flags & CS_CHAT) == 0)
 179                             && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 180                                 cprintf(":| %-25s <%s>:\n",
 181                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 182                                         roomname);
 183                         }
 184                 }
 185         }
 186         end_critical_section(S_SESSION_TABLE);
 187
 188         if (allflag == 2) {
 189                 if (count > 1)
 190                         cprintf(":|There are %d users here.\n", count);
 191                 else
 192                         cprintf(":|Note: you are the only one here.\n");
 193         }
 194
 195         cprintf(":|\n");
 196 }
 197
 198
 199 void cmd_chat(char *argbuf)
 200 {
 201         char cmdbuf[256];
 202         char *un;
 203         char *strptr1;
 204         int MyLastMsg, ThisLastMsg;
 205         struct ChatLine *clptr;
 206         struct CitContext *t_context;
 207         int retval;
 208
 209         if (!(CC->logged_in)) {
 210                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 211                 return;
 212         }
 213         strcpy(CC->chat_room, "Main room");
 214
 215         CC->cs_flags = CC->cs_flags | CS_CHAT;
 216         cprintf("%d Entering chat mode (type '/help' for available commands)\n",
 217                 START_CHAT_MODE);
 218
 219         MyLastMsg = ChatLastMsg;
 220
 221         if ((CC->cs_flags & CS_STEALTH) == 0) {
 222                 allwrite("<entering chat>", 0, CC->chat_room, NULL);
 223         }
 224         strcpy(cmdbuf, "");
 225
 226         do_chat_listing(2);
 227
 228         while (1) {
 229                 int ok_cmd;
 230                 int linelen;
 231
 232                 ok_cmd = 0;
 233                 linelen = strlen(cmdbuf);
 234                 if (linelen > 100) --linelen;   /* truncate too-long lines */
 235                 cmdbuf[linelen + 1] = 0;
 236
 237                 retval = client_read_to(&cmdbuf[linelen], 1, 2);
 238
 239                 if (retval < 0) {       /* socket broken? */
 240                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 241                                 allwrite("<disconnected>", 0,
 242                                         CC->chat_room, NULL);
 243                         }
 244                         return;
 245                 }
 246
 247                 /* if we have a complete line, do send processing */
 248                 if (strlen(cmdbuf) > 0)
 249                         if (cmdbuf[strlen(cmdbuf) - 1] == 10) {
 250                                 cmdbuf[strlen(cmdbuf) - 1] = 0;
 251                                 time(&CC->lastcmd);
 252                                 time(&CC->lastidle);
 253
 254                                 if ((!strcasecmp(cmdbuf, "exit"))
 255                                     || (!strcasecmp(cmdbuf, "/exit"))
 256                                     || (!strcasecmp(cmdbuf, "quit"))
 257                                     || (!strcasecmp(cmdbuf, "logout"))
 258                                     || (!strcasecmp(cmdbuf, "logoff"))
 259                                     || (!strcasecmp(cmdbuf, "/q"))
 260                                     || (!strcasecmp(cmdbuf, ".q"))
 261                                     || (!strcasecmp(cmdbuf, "/quit"))
 262                                     )
 263                                         strcpy(cmdbuf, "000");
 264
 265                                 if (!strcmp(cmdbuf, "000")) {
 266                                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 267                                                 allwrite("<exiting chat>", 0, CC->chat_room, NULL);
 268                                         }
 269                                         sleep(1);
 270                                         cprintf("000\n");
 271                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 272                                         return;
 273                                 }
 274                                 if ((!strcasecmp(cmdbuf, "/help"))
 275                                     || (!strcasecmp(cmdbuf, "help"))
 276                                     || (!strcasecmp(cmdbuf, "/?"))
 277                                     || (!strcasecmp(cmdbuf, "?"))) {
 278                                         cprintf(":|\n");
 279                                         cprintf(":|Available commands: \n");
 280                                         cprintf(":|/help   (prints this message) \n");
 281                                         cprintf(":|/who    (list users currently in chat) \n");
 282                                         cprintf(":|/whobbs (list users in chat -and- elsewhere) \n");
 283                                         cprintf(":|/me     ('action' line, ala irc) \n");
 284                                         cprintf(":|/msg    (send private message, ala irc) \n");
 285                                         cprintf(":|/join   (join new room) \n");
 286                                         cprintf(":|/quit   (return to the BBS) \n");
 287                                         cprintf(":|\n");
 288                                         ok_cmd = 1;
 289                                 }
 290                                 if (!strcasecmp(cmdbuf, "/who")) {
 291                                         do_chat_listing(0);
 292                                         ok_cmd = 1;
 293                                 }
 294                                 if (!strcasecmp(cmdbuf, "/whobbs")) {
 295                                         do_chat_listing(1);
 296                                         ok_cmd = 1;
 297                                 }
 298                                 if (!strncasecmp(cmdbuf, "/me ", 4)) {
 299                                         allwrite(&cmdbuf[4], 1, CC->chat_room, NULL);
 300                                         ok_cmd = 1;
 301                                 }
 302                                 if (!strncasecmp(cmdbuf, "/msg ", 5)) {
 303                                         ok_cmd = 1;
 304                                         strptr1 = &cmdbuf[5];
 305                                         if ((t_context = find_context(&strptr1))) {
 306                                                 allwrite(strptr1, 2, "", CC->curr_user);
 307                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 308                                                         allwrite(strptr1, 2, "", t_context->curr_user);
 309                                         } else
 310                                                 cprintf(":|User not found.\n", cmdbuf);
 311                                         cprintf("\n");
 312                                 }
 313                                 if (!strncasecmp(cmdbuf, "/join ", 6)) {
 314                                         ok_cmd = 1;
 315                                         allwrite("<changing rooms>", 0, CC->chat_room, NULL);
 316                                         if (!cmdbuf[6])
 317                                                 strcpy(CC->chat_room, "Main room");
 318                                         else {
 319                                                 strncpy(CC->chat_room, &cmdbuf[6],
 320                                                    sizeof CC->chat_room);
 321                                                 CC->chat_room[sizeof CC->chat_room - 1] = 0;
 322                                         }
 323                                         allwrite("<joining room>", 0, CC->chat_room, NULL);
 324                                         cprintf("\n");
 325                                 }
 326                                 if ((cmdbuf[0] != '/') && (strlen(cmdbuf) > 0)) {
 327                                         ok_cmd = 1;
 328                                         allwrite(cmdbuf, 0, CC->chat_room, NULL);
 329                                 }
 330                                 if ((!ok_cmd) && (cmdbuf[0]) && (cmdbuf[0] != '\n'))
 331                                         cprintf(":|Command %s is not understood.\n", cmdbuf);
 332
 333                                 strcpy(cmdbuf, "");
 334
 335                         }
 336                 /* now check the queue for new incoming stuff */
 337
 338                 if (CC->fake_username[0])
 339                         un = CC->fake_username;
 340                 else
 341                         un = CC->curr_user;
 342                 if (ChatLastMsg > MyLastMsg) {
 343                         ThisLastMsg = ChatLastMsg;
 344                         for (clptr = ChatQueue; clptr != NULL; clptr = clptr->next) {
 345                                 if ((clptr->chat_seq > MyLastMsg) && ((!clptr->chat_username[0]) || (!strncasecmp(un, clptr->chat_username, 32)))) {
 346                                         if ((!clptr->chat_room[0]) || (!strncasecmp(CC->chat_room, clptr->chat_room, ROOMNAMELEN))) {
 347                                                 cprintf("%s\n", clptr->chat_text);
 348                                         }
 349                                 }
 350                         }
 351                         MyLastMsg = ThisLastMsg;
 352                 }
 353         }
 354 }
 355
 356
 357
 358 /*
 359  * Delete any remaining express messages
 360  */
 361 void delete_express_messages(void) {
 362         struct ExpressMessage *ptr;
 363
 364         begin_critical_section(S_SESSION_TABLE);
 365         while (CC->FirstExpressMessage != NULL) {
 366                 ptr = CC->FirstExpressMessage->next;
 367                 if (CC->FirstExpressMessage->text != NULL)
 368                         phree(CC->FirstExpressMessage->text);
 369                 phree(CC->FirstExpressMessage);
 370                 CC->FirstExpressMessage = ptr;
 371                 }
 372         end_critical_section(S_SESSION_TABLE);
 373         }
 374
 375
 376
 377
 378 /*
 379  * Poll for express messages (OLD METHOD -- ***DEPRECATED ***)
 380  */
 381 void cmd_pexp(char *argbuf)
 382 {
 383         struct ExpressMessage *ptr, *holdptr;
 384
 385         if (CC->FirstExpressMessage == NULL) {
 386                 cprintf("%d No express messages waiting.\n", ERROR);
 387                 return;
 388         }
 389         begin_critical_section(S_SESSION_TABLE);
 390         ptr = CC->FirstExpressMessage;
 391         CC->FirstExpressMessage = NULL;
 392         end_critical_section(S_SESSION_TABLE);
 393
 394         cprintf("%d Express msgs:\n", LISTING_FOLLOWS);
 395         while (ptr != NULL) {
 396                 if (ptr->flags && EM_BROADCAST)
 397                         cprintf("Broadcast message ");
 398                 else if (ptr->flags && EM_CHAT)
 399                         cprintf("Chat request ");
 400                 else if (ptr->flags && EM_GO_AWAY)
 401                         cprintf("Please logoff now, as requested ");
 402                 else
 403                         cprintf("Message ");
 404                 cprintf("from %s:\n", ptr->sender);
 405                 if (ptr->text != NULL)
 406                         memfmout(80, ptr->text, 0);
 407
 408                 holdptr = ptr->next;
 409                 if (ptr->text != NULL) phree(ptr->text);
 410                 phree(ptr);
 411                 ptr = holdptr;
 412         }
 413         cprintf("000\n");
 414 }
 415
 416
 417 /*
 418  * Get express messages (new method)
 419  */
 420 void cmd_gexp(char *argbuf) {
 421         struct ExpressMessage *ptr;
 422
 423         if (CC->FirstExpressMessage == NULL) {
 424                 cprintf("%d No express messages waiting.\n", ERROR);
 425                 return;
 426         }
 427
 428         begin_critical_section(S_SESSION_TABLE);
 429         ptr = CC->FirstExpressMessage;
 430         CC->FirstExpressMessage = CC->FirstExpressMessage->next;
 431         end_critical_section(S_SESSION_TABLE);
 432
 433         cprintf("%d %d|%ld|%d|%s|%s\n",
 434                 LISTING_FOLLOWS,
 435                 ((ptr->next != NULL) ? 1 : 0),          /* more msgs? */
 436                 ptr->timestamp,                         /* time sent */
 437                 ptr->flags,                             /* flags */
 438                 ptr->sender,                            /* sender of msg */
 439                 config.c_nodename);                     /* static for now */
 440         if (ptr->text != NULL) {
 441                 memfmout(80, ptr->text, 0);
 442                 if (ptr->text[strlen(ptr->text)-1] != '\n') cprintf("\n");
 443                 phree(ptr->text);
 444                 }
 445         cprintf("000\n");
 446         phree(ptr);
 447 }
 448
 449
 450
 451 /*
 452  * This is the back end to the express message sending function.
 453  * Returns the number of users to which the message was sent.
 454  * Sending a zero-length message tests for recipients without sending messages.
 455  */
 456 int send_express_message(char *lun, char *x_user, char *x_msg)
 457 {
 458         int message_sent = 0;
 459         struct CitContext *ccptr;
 460         struct ExpressMessage *newmsg, *findend;
 461         char *un;
 462         size_t msglen = 0;
 463         int do_send = 0;
 464
 465         if (strlen(x_msg) > 0) {
 466                 msglen = strlen(x_msg) + 4;
 467                 do_send = 1;
 468                 }
 469
 470         /* find the target user's context and append the message */
 471         begin_critical_section(S_SESSION_TABLE);
 472         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 473
 474                 if (ccptr->fake_username[0])    /* <bc> */
 475                         un = ccptr->fake_username;
 476                 else
 477                         un = ccptr->usersupp.fullname;
 478
 479                 if ((!strcasecmp(un, x_user))
 480                     || (!strcasecmp(x_user, "broadcast"))) {
 481                         if (do_send) {
 482                                 newmsg = (struct ExpressMessage *)
 483                                         mallok(sizeof (struct ExpressMessage));
 484                                 memset(newmsg, 0,
 485                                         sizeof (struct ExpressMessage));
 486                                 safestrncpy(newmsg->sender, lun,
 487                                             sizeof newmsg->sender);
 488                                 if (!strcasecmp(x_user, "broadcast"))
 489                                         newmsg->flags |= EM_BROADCAST;
 490                                 newmsg->text = mallok(msglen);
 491                                 safestrncpy(newmsg->text, x_msg, msglen);
 492
 493                                 if (ccptr->FirstExpressMessage == NULL)
 494                                         ccptr->FirstExpressMessage = newmsg;
 495                                 else {
 496                                         findend = ccptr->FirstExpressMessage;
 497                                         while (findend->next != NULL)
 498                                                 findend = findend->next;
 499                                         findend->next = newmsg;
 500                                 }
 501                         }
 502                         ++message_sent;
 503                 }
 504         }
 505         end_critical_section(S_SESSION_TABLE);
 506
 507         /* Log the page to disk if configured to do so  */
 508         if ((strlen(config.c_logpages) > 0) && (do_send) ) {
 509                 quickie_message(lun, x_user, config.c_logpages, x_msg);
 510         }
 511
 512         return (message_sent);
 513 }
 514
 515 /*
 516  * send express messages  <bc>
 517  */
 518 void cmd_sexp(char *argbuf)
 519 {
 520         int message_sent = 0;
 521         char x_user[256];
 522         char x_msg[256];
 523         char *lun;              /* <bc> */
 524         char *x_big_msgbuf = NULL;
 525
 526         if ((!(CC->logged_in)) && (!(CC->internal_pgm))) {
 527                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 528                 return;
 529         }
 530         if (CC->fake_username[0])
 531                 lun = CC->fake_username;
 532         else
 533                 lun = CC->usersupp.fullname;
 534
 535         extract(x_user, argbuf, 0);
 536
 537         extract(x_msg, argbuf, 1);
 538
 539         if (!x_user[0]) {
 540                 cprintf("%d You were not previously paged.\n", ERROR);
 541                 return;
 542         }
 543         if ((!strcasecmp(x_user, "broadcast")) && (CC->usersupp.axlevel < 6)) {
 544                 cprintf("%d Higher access required to send a broadcast.\n",
 545                         ERROR + HIGHER_ACCESS_REQUIRED);
 546                 return;
 547         }
 548         /* This loop handles text-transfer pages */
 549         if (!strcmp(x_msg, "-")) {
 550                 message_sent = PerformXmsgHooks(lun, x_user, "");
 551                 if (message_sent == 0) {
 552                         cprintf("%d No user '%s' logged in.\n", ERROR, x_user);
 553                         return;
 554                 }
 555                 cprintf("%d Transmit message (will deliver to %d users)\n",
 556                         SEND_LISTING, message_sent);
 557                 x_big_msgbuf = mallok(256);
 558                 memset(x_big_msgbuf, 0, 256);
 559                 while (client_gets(x_msg), strcmp(x_msg, "000")) {
 560                         x_big_msgbuf = reallok(x_big_msgbuf,
 561                                strlen(x_big_msgbuf) + strlen(x_msg) + 4);
 562                         if (strlen(x_big_msgbuf) > 0)
 563                            if (x_big_msgbuf[strlen(x_big_msgbuf)] != '\n')
 564                                 strcat(x_big_msgbuf, "\n");
 565                         strcat(x_big_msgbuf, x_msg);
 566                 }
 567                 PerformXmsgHooks(lun, x_user, x_big_msgbuf);
 568                 phree(x_big_msgbuf);
 569
 570                 /* This loop handles inline pages */
 571         } else {
 572                 message_sent = PerformXmsgHooks(lun, x_user, x_msg);
 573
 574                 if (message_sent > 0) {
 575                         if (strlen(x_msg) > 0)
 576                                 cprintf("%d Message sent", OK);
 577                         else
 578                                 cprintf("%d Ok to send message", OK);
 579                         if (message_sent > 1)
 580                                 cprintf(" to %d users", message_sent);
 581                         cprintf(".\n");
 582                 } else {
 583                         cprintf("%d No user '%s' logged in.\n", ERROR, x_user);
 584                 }
 585
 586
 587         }
 588 }