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