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 *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, CC->quickroom.QRname,
  87                         sizeof clnew->chat_room);
  88         clnew->chat_room[sizeof clnew->chat_room - 1] = 0;
  89         if (username) {
  90                 safestrncpy(clnew->chat_username, username,
  91                         sizeof clnew->chat_username);
  92                 clnew->chat_username[sizeof clnew->chat_username - 1] = 0;
  93         } else
  94                 clnew->chat_username[0] = '\0';
  95         safestrncpy(clnew->chat_text, bcast, sizeof clnew->chat_text);
  96
  97         /* Here's the critical section.
  98          * First, add the new message to the queue...
  99          */
 100         begin_critical_section(S_CHATQUEUE);
 101         ++ChatLastMsg;
 102         clnew->chat_seq = ChatLastMsg;
 103         if (ChatQueue == NULL) {
 104                 ChatQueue = clnew;
 105         } else {
 106                 for (clptr = ChatQueue; clptr->next != NULL; clptr = clptr->next);;
 107                 clptr->next = clnew;
 108         }
 109
 110         /* Then, before releasing the lock, free the expired messages */
 111         while (1) {
 112                 if (ChatQueue == NULL)
 113                         goto DONE_FREEING;
 114                 if ((now - ChatQueue->chat_time) < 120L)
 115                         goto DONE_FREEING;
 116                 clptr = ChatQueue;
 117                 ChatQueue = ChatQueue->next;
 118                 phree(clptr);
 119         }
 120 DONE_FREEING:
 121         end_critical_section(S_CHATQUEUE);
 122 }
 123
 124
 125 t_context *find_context(char **unstr)
 126 {
 127         t_context *t_cc, *found_cc = NULL;
 128         char *name, *tptr;
 129
 130         if ((!*unstr) || (!unstr))
 131                 return (NULL);
 132
 133         begin_critical_section(S_SESSION_TABLE);
 134         for (t_cc = ContextList; ((t_cc) && (!found_cc)); t_cc = t_cc->next) {
 135                 if (t_cc->fake_username[0])
 136                         name = t_cc->fake_username;
 137                 else
 138                         name = t_cc->curr_user;
 139                 tptr = *unstr;
 140                 if ((!strncasecmp(name, tptr, strlen(name))) && (tptr[strlen(name)] == ' ')) {
 141                         found_cc = t_cc;
 142                         *unstr = &(tptr[strlen(name) + 1]);
 143                 }
 144         }
 145         end_critical_section(S_SESSION_TABLE);
 146
 147         return (found_cc);
 148 }
 149
 150 /*
 151  * List users in chat.
 152  * allflag ==   0 = list users in chat
 153  *              1 = list users in chat, followed by users not in chat
 154  *              2 = display count only
 155  */
 156
 157 void do_chat_listing(int allflag)
 158 {
 159         struct CitContext *ccptr;
 160         int count = 0;
 161         int count_elsewhere = 0;
 162         char roomname[ROOMNAMELEN];
 163
 164         if ((allflag == 0) || (allflag == 1))
 165                 cprintf(":|\n:| Users currently in chat:\n");
 166         begin_critical_section(S_SESSION_TABLE);
 167         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 168                 if (ccptr->cs_flags & CS_CHAT) {
 169                         if (!strcasecmp(ccptr->quickroom.QRname,
 170                            CC->quickroom.QRname)) {
 171                                 ++count;
 172                         }
 173                         else {
 174                                 ++count_elsewhere;
 175                         }
 176                 }
 177
 178                 GenerateRoomDisplay(roomname, ccptr, CC);
 179                 if ((CC->usersupp.axlevel < 6)
 180                    && (strlen(ccptr->fake_roomname)>0)) {
 181                         strcpy(roomname, ccptr->fake_roomname);
 182                 }
 183
 184                 if ((ccptr->cs_flags & CS_CHAT)
 185                     && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 186                         if ((allflag == 0) || (allflag == 1)) {
 187                                 cprintf(":| %-25s <%s>:\n",
 188                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 189                                         roomname);
 190                         }
 191                 }
 192         }
 193
 194         if (allflag == 1) {
 195                 cprintf(":|\n:| Users not in chat:\n");
 196                 for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 197
 198                         if (((ccptr->cs_flags & CS_CHAT) == 0)
 199                             && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 200                                 cprintf(":| %-25s <%s>:\n",
 201                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 202                                         roomname);
 203                         }
 204                 }
 205         }
 206         end_critical_section(S_SESSION_TABLE);
 207
 208         if (allflag == 2) {
 209                 if (count > 1) {
 210                         cprintf(":|There are %d users here.\n", count);
 211                 }
 212                 else {
 213                         cprintf(":|Note: you are the only one here.\n");
 214                 }
 215                 if (count_elsewhere > 0) {
 216                         cprintf(":|There are %d users chatting in other rooms.\n", count_elsewhere);
 217                 }
 218         }
 219
 220         cprintf(":|\n");
 221 }
 222
 223
 224 void cmd_chat(char *argbuf)
 225 {
 226         char cmdbuf[256];
 227         char *un;
 228         char *strptr1;
 229         int MyLastMsg, ThisLastMsg;
 230         struct ChatLine *clptr;
 231         struct CitContext *t_context;
 232         int retval;
 233
 234         if (!(CC->logged_in)) {
 235                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 236                 return;
 237         }
 238
 239         CC->cs_flags = CC->cs_flags | CS_CHAT;
 240         cprintf("%d Entering chat mode (type '/help' for available commands)\n",
 241                 START_CHAT_MODE);
 242
 243         MyLastMsg = ChatLastMsg;
 244
 245         if ((CC->cs_flags & CS_STEALTH) == 0) {
 246                 allwrite("<entering chat>", 0, NULL);
 247         }
 248         strcpy(cmdbuf, "");
 249
 250         do_chat_listing(2);
 251
 252         while (1) {
 253                 int ok_cmd;
 254                 int linelen;
 255
 256                 ok_cmd = 0;
 257                 linelen = strlen(cmdbuf);
 258                 if (linelen > 100) --linelen;   /* truncate too-long lines */
 259                 cmdbuf[linelen + 1] = 0;
 260
 261                 retval = client_read_to(&cmdbuf[linelen], 1, 2);
 262
 263                 if (retval < 0) {       /* socket broken? */
 264                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 265                                 allwrite("<disconnected>", 0, NULL);
 266                         }
 267                         return;
 268                 }
 269
 270                 /* if we have a complete line, do send processing */
 271                 if (strlen(cmdbuf) > 0)
 272                         if (cmdbuf[strlen(cmdbuf) - 1] == 10) {
 273                                 cmdbuf[strlen(cmdbuf) - 1] = 0;
 274                                 time(&CC->lastcmd);
 275                                 time(&CC->lastidle);
 276
 277                                 if ((!strcasecmp(cmdbuf, "exit"))
 278                                     || (!strcasecmp(cmdbuf, "/exit"))
 279                                     || (!strcasecmp(cmdbuf, "quit"))
 280                                     || (!strcasecmp(cmdbuf, "logout"))
 281                                     || (!strcasecmp(cmdbuf, "logoff"))
 282                                     || (!strcasecmp(cmdbuf, "/q"))
 283                                     || (!strcasecmp(cmdbuf, ".q"))
 284                                     || (!strcasecmp(cmdbuf, "/quit"))
 285                                     )
 286                                         strcpy(cmdbuf, "000");
 287
 288                                 if (!strcmp(cmdbuf, "000")) {
 289                                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 290                                                 allwrite("<exiting chat>", 0, NULL);
 291                                         }
 292                                         sleep(1);
 293                                         cprintf("000\n");
 294                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 295                                         return;
 296                                 }
 297                                 if ((!strcasecmp(cmdbuf, "/help"))
 298                                     || (!strcasecmp(cmdbuf, "help"))
 299                                     || (!strcasecmp(cmdbuf, "/?"))
 300                                     || (!strcasecmp(cmdbuf, "?"))) {
 301                                         cprintf(":|\n");
 302                                         cprintf(":|Available commands: \n");
 303                                         cprintf(":|/help   (prints this message) \n");
 304                                         cprintf(":|/who    (list users currently in chat) \n");
 305                                         cprintf(":|/whobbs (list users in chat -and- elsewhere) \n");
 306                                         cprintf(":|/me     ('action' line, ala irc) \n");
 307                                         cprintf(":|/msg    (send private message, ala irc) \n");
 308                                         cprintf(":|/quit   (return to the BBS) \n");
 309                                         cprintf(":|\n");
 310                                         ok_cmd = 1;
 311                                 }
 312                                 if (!strcasecmp(cmdbuf, "/who")) {
 313                                         do_chat_listing(0);
 314                                         ok_cmd = 1;
 315                                 }
 316                                 if (!strcasecmp(cmdbuf, "/whobbs")) {
 317                                         do_chat_listing(1);
 318                                         ok_cmd = 1;
 319                                 }
 320                                 if (!strncasecmp(cmdbuf, "/me ", 4)) {
 321                                         allwrite(&cmdbuf[4], 1, NULL);
 322                                         ok_cmd = 1;
 323                                 }
 324                                 if (!strncasecmp(cmdbuf, "/msg ", 5)) {
 325                                         ok_cmd = 1;
 326                                         strptr1 = &cmdbuf[5];
 327                                         if ((t_context = find_context(&strptr1))) {
 328                                                 allwrite(strptr1, 2, CC->curr_user);
 329                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 330                                                         allwrite(strptr1, 2, t_context->curr_user);
 331                                         } else
 332                                                 cprintf(":|User not found.\n", cmdbuf);
 333                                         cprintf("\n");
 334                                 }
 335                                 if ((cmdbuf[0] != '/') && (strlen(cmdbuf) > 0)) {
 336                                         ok_cmd = 1;
 337                                         allwrite(cmdbuf, 0, NULL);
 338                                 }
 339                                 if ((!ok_cmd) && (cmdbuf[0]) && (cmdbuf[0] != '\n'))
 340                                         cprintf(":|Command %s is not understood.\n", cmdbuf);
 341
 342                                 strcpy(cmdbuf, "");
 343
 344                         }
 345                 /* now check the queue for new incoming stuff */
 346
 347                 if (CC->fake_username[0])
 348                         un = CC->fake_username;
 349                 else
 350                         un = CC->curr_user;
 351                 if (ChatLastMsg > MyLastMsg) {
 352                         ThisLastMsg = ChatLastMsg;
 353                         for (clptr = ChatQueue; clptr != NULL; clptr = clptr->next) {
 354                                 if ((clptr->chat_seq > MyLastMsg) && ((!clptr->chat_username[0]) || (!strncasecmp(un, clptr->chat_username, 32)))) {
 355                                         if ((!clptr->chat_room[0]) || (!strncasecmp(CC->quickroom.QRname, clptr->chat_room, ROOMNAMELEN))) {
 356                                                 cprintf("%s\n", clptr->chat_text);
 357                                         }
 358                                 }
 359                         }
 360                         MyLastMsg = ThisLastMsg;
 361                 }
 362         }
 363 }
 364
 365
 366
 367 /*
 368  * Delete any remaining express messages
 369  */
 370 void delete_express_messages(void) {
 371         struct ExpressMessage *ptr;
 372
 373         begin_critical_section(S_SESSION_TABLE);
 374         while (CC->FirstExpressMessage != NULL) {
 375                 ptr = CC->FirstExpressMessage->next;
 376                 if (CC->FirstExpressMessage->text != NULL)
 377                         phree(CC->FirstExpressMessage->text);
 378                 phree(CC->FirstExpressMessage);
 379                 CC->FirstExpressMessage = ptr;
 380                 }
 381         end_critical_section(S_SESSION_TABLE);
 382         }
 383
 384
 385
 386
 387 /*
 388  * Poll for express messages (OLD METHOD -- ***DEPRECATED ***)
 389  */
 390 void cmd_pexp(char *argbuf)
 391 {
 392         struct ExpressMessage *ptr, *holdptr;
 393
 394         if (CC->FirstExpressMessage == NULL) {
 395                 cprintf("%d No express messages waiting.\n", ERROR);
 396                 return;
 397         }
 398         begin_critical_section(S_SESSION_TABLE);
 399         ptr = CC->FirstExpressMessage;
 400         CC->FirstExpressMessage = NULL;
 401         end_critical_section(S_SESSION_TABLE);
 402
 403         cprintf("%d Express msgs:\n", LISTING_FOLLOWS);
 404         while (ptr != NULL) {
 405                 if (ptr->flags && EM_BROADCAST)
 406                         cprintf("Broadcast message ");
 407                 else if (ptr->flags && EM_CHAT)
 408                         cprintf("Chat request ");
 409                 else if (ptr->flags && EM_GO_AWAY)
 410                         cprintf("Please logoff now, as requested ");
 411                 else
 412                         cprintf("Message ");
 413                 cprintf("from %s:\n", ptr->sender);
 414                 if (ptr->text != NULL)
 415                         memfmout(80, ptr->text, 0, "\n");
 416
 417                 holdptr = ptr->next;
 418                 if (ptr->text != NULL) phree(ptr->text);
 419                 phree(ptr);
 420                 ptr = holdptr;
 421         }
 422         cprintf("000\n");
 423 }
 424
 425
 426 /*
 427  * Get express messages (new method)
 428  */
 429 void cmd_gexp(char *argbuf) {
 430         struct ExpressMessage *ptr;
 431
 432         if (CC->FirstExpressMessage == NULL) {
 433                 cprintf("%d No express messages waiting.\n", ERROR);
 434                 return;
 435         }
 436
 437         begin_critical_section(S_SESSION_TABLE);
 438         ptr = CC->FirstExpressMessage;
 439         CC->FirstExpressMessage = CC->FirstExpressMessage->next;
 440         end_critical_section(S_SESSION_TABLE);
 441
 442         cprintf("%d %d|%ld|%d|%s|%s\n",
 443                 LISTING_FOLLOWS,
 444                 ((ptr->next != NULL) ? 1 : 0),          /* more msgs? */
 445                 ptr->timestamp,                         /* time sent */
 446                 ptr->flags,                             /* flags */
 447                 ptr->sender,                            /* sender of msg */
 448                 config.c_nodename);                     /* static for now */
 449         if (ptr->text != NULL) {
 450                 memfmout(80, ptr->text, 0, "\n");
 451                 if (ptr->text[strlen(ptr->text)-1] != '\n') cprintf("\n");
 452                 phree(ptr->text);
 453                 }
 454         cprintf("000\n");
 455         phree(ptr);
 456 }
 457
 458
 459
 460 /*
 461  * This is the back end to the express message sending function.
 462  * Returns the number of users to which the message was sent.
 463  * Sending a zero-length message tests for recipients without sending messages.
 464  */
 465 int send_express_message(char *lun, char *x_user, char *x_msg)
 466 {
 467         int message_sent = 0;
 468         struct CitContext *ccptr;
 469         struct ExpressMessage *newmsg, *findend;
 470         char *un;
 471         size_t msglen = 0;
 472         int do_send = 0;
 473
 474         if (strlen(x_msg) > 0) {
 475                 msglen = strlen(x_msg) + 4;
 476                 do_send = 1;
 477                 }
 478
 479         /* find the target user's context and append the message */
 480         begin_critical_section(S_SESSION_TABLE);
 481         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 482
 483                 if (ccptr->fake_username[0])    /* <bc> */
 484                         un = ccptr->fake_username;
 485                 else
 486                         un = ccptr->usersupp.fullname;
 487
 488                 if ((!strcasecmp(un, x_user))
 489                     || (!strcasecmp(x_user, "broadcast"))) {
 490                         if (do_send) {
 491                                 newmsg = (struct ExpressMessage *)
 492                                         mallok(sizeof (struct ExpressMessage));
 493                                 memset(newmsg, 0,
 494                                         sizeof (struct ExpressMessage));
 495                                 safestrncpy(newmsg->sender, lun,
 496                                             sizeof newmsg->sender);
 497                                 if (!strcasecmp(x_user, "broadcast"))
 498                                         newmsg->flags |= EM_BROADCAST;
 499                                 newmsg->text = mallok(msglen);
 500                                 safestrncpy(newmsg->text, x_msg, msglen);
 501
 502                                 if (ccptr->FirstExpressMessage == NULL)
 503                                         ccptr->FirstExpressMessage = newmsg;
 504                                 else {
 505                                         findend = ccptr->FirstExpressMessage;
 506                                         while (findend->next != NULL)
 507                                                 findend = findend->next;
 508                                         findend->next = newmsg;
 509                                 }
 510                         }
 511                         ++message_sent;
 512                 }
 513         }
 514         end_critical_section(S_SESSION_TABLE);
 515
 516         /* Log the page to disk if configured to do so  */
 517         if ((strlen(config.c_logpages) > 0) && (do_send) ) {
 518                 quickie_message(lun, x_user, config.c_logpages, x_msg);
 519         }
 520
 521         return (message_sent);
 522 }
 523
 524 /*
 525  * send express messages  <bc>
 526  */
 527 void cmd_sexp(char *argbuf)
 528 {
 529         int message_sent = 0;
 530         char x_user[256];
 531         char x_msg[256];
 532         char *lun;              /* <bc> */
 533         char *x_big_msgbuf = NULL;
 534
 535         if ((!(CC->logged_in)) && (!(CC->internal_pgm))) {
 536                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 537                 return;
 538         }
 539         if (CC->fake_username[0])
 540                 lun = CC->fake_username;
 541         else
 542                 lun = CC->usersupp.fullname;
 543
 544         extract(x_user, argbuf, 0);
 545
 546         extract(x_msg, argbuf, 1);
 547
 548         if (!x_user[0]) {
 549                 cprintf("%d You were not previously paged.\n", ERROR);
 550                 return;
 551         }
 552         if ((!strcasecmp(x_user, "broadcast")) && (CC->usersupp.axlevel < 6)) {
 553                 cprintf("%d Higher access required to send a broadcast.\n",
 554                         ERROR + HIGHER_ACCESS_REQUIRED);
 555                 return;
 556         }
 557         /* This loop handles text-transfer pages */
 558         if (!strcmp(x_msg, "-")) {
 559                 message_sent = PerformXmsgHooks(lun, x_user, "");
 560                 if (message_sent == 0) {
 561                         cprintf("%d No user '%s' logged in.\n", ERROR, x_user);
 562                         return;
 563                 }
 564                 cprintf("%d Transmit message (will deliver to %d users)\n",
 565                         SEND_LISTING, message_sent);
 566                 x_big_msgbuf = mallok(256);
 567                 memset(x_big_msgbuf, 0, 256);
 568                 while (client_gets(x_msg), strcmp(x_msg, "000")) {
 569                         x_big_msgbuf = reallok(x_big_msgbuf,
 570                                strlen(x_big_msgbuf) + strlen(x_msg) + 4);
 571                         if (strlen(x_big_msgbuf) > 0)
 572                            if (x_big_msgbuf[strlen(x_big_msgbuf)] != '\n')
 573                                 strcat(x_big_msgbuf, "\n");
 574                         strcat(x_big_msgbuf, x_msg);
 575                 }
 576                 PerformXmsgHooks(lun, x_user, x_big_msgbuf);
 577                 phree(x_big_msgbuf);
 578
 579                 /* This loop handles inline pages */
 580         } else {
 581                 message_sent = PerformXmsgHooks(lun, x_user, x_msg);
 582
 583                 if (message_sent > 0) {
 584                         if (strlen(x_msg) > 0)
 585                                 cprintf("%d Message sent", OK);
 586                         else
 587                                 cprintf("%d Ok to send message", OK);
 588                         if (message_sent > 1)
 589                                 cprintf(" to %d users", message_sent);
 590                         cprintf(".\n");
 591                 } else {
 592                         cprintf("%d No user '%s' logged in.\n", ERROR, x_user);
 593                 }
 594
 595
 596         }
 597 }