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