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