citadel/serv_chat.c

   1 /*
   2  * $Id$
   3  *
   4  * This module handles all "real time" communication between users.  The
   5  * modes of communication currently supported are Chat and Paging.
   6  *
   7  */
   8 #include "sysdep.h"
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <signal.h>
  14 #include <pwd.h>
  15 #include <errno.h>
  16 #include <sys/types.h>
  17
  18 #if TIME_WITH_SYS_TIME
  19 # include <sys/time.h>
  20 # include <time.h>
  21 #else
  22 # if HAVE_SYS_TIME_H
  23 #  include <sys/time.h>
  24 # else
  25 #  include <time.h>
  26 # endif
  27 #endif
  28
  29 #include <sys/wait.h>
  30 #include <string.h>
  31 #include <limits.h>
  32 #include "citadel.h"
  33 #include "server.h"
  34 #include "dynloader.h"
  35 #include <syslog.h>
  36 #include "serv_chat.h"
  37 #include "sysdep_decls.h"
  38 #include "citserver.h"
  39 #include "support.h"
  40 #include "config.h"
  41 #include "tools.h"
  42 #include "msgbase.h"
  43 #include "user_ops.h"
  44 #include "room_ops.h"
  45
  46 #ifndef HAVE_SNPRINTF
  47 #include "snprintf.h"
  48 #endif
  49
  50 struct ChatLine *ChatQueue = NULL;
  51 int ChatLastMsg = 0;
  52
  53
  54
  55
  56 void allwrite(char *cmdbuf, int flag, char *username)
  57 {
  58         FILE *fp;
  59         char bcast[SIZ];
  60         char *un;
  61         struct ChatLine *clptr, *clnew;
  62         time_t now;
  63
  64         if (CC->fake_username[0])
  65                 un = CC->fake_username;
  66         else
  67                 un = CC->usersupp.fullname;
  68         if (flag == 1) {
  69                 snprintf(bcast, sizeof bcast, ":|<%s %s>", un, cmdbuf);
  70         } else if (flag == 0) {
  71                 snprintf(bcast, sizeof bcast, "%s|%s", un, cmdbuf);
  72         } else if (flag == 2) {
  73                 snprintf(bcast, sizeof bcast, ":|<%s whispers %s>", un, cmdbuf);
  74         }
  75         if ((strcasecmp(cmdbuf, "NOOP")) && (flag != 2)) {
  76                 fp = fopen(CHATLOG, "a");
  77                 fprintf(fp, "%s\n", bcast);
  78                 fclose(fp);
  79         }
  80         clnew = (struct ChatLine *) mallok(sizeof(struct ChatLine));
  81         memset(clnew, 0, sizeof(struct ChatLine));
  82         if (clnew == NULL) {
  83                 fprintf(stderr, "citserver: cannot alloc chat line: %s\n",
  84                         strerror(errno));
  85                 return;
  86         }
  87         time(&now);
  88         clnew->next = NULL;
  89         clnew->chat_time = now;
  90         safestrncpy(clnew->chat_room, CC->quickroom.QRname,
  91                         sizeof clnew->chat_room);
  92         clnew->chat_room[sizeof clnew->chat_room - 1] = 0;
  93         if (username) {
  94                 safestrncpy(clnew->chat_username, username,
  95                         sizeof clnew->chat_username);
  96                 clnew->chat_username[sizeof clnew->chat_username - 1] = 0;
  97         } else
  98                 clnew->chat_username[0] = '\0';
  99         safestrncpy(clnew->chat_text, bcast, sizeof clnew->chat_text);
 100
 101         /* Here's the critical section.
 102          * First, add the new message to the queue...
 103          */
 104         begin_critical_section(S_CHATQUEUE);
 105         ++ChatLastMsg;
 106         clnew->chat_seq = ChatLastMsg;
 107         if (ChatQueue == NULL) {
 108                 ChatQueue = clnew;
 109         } else {
 110                 for (clptr = ChatQueue; clptr->next != NULL; clptr = clptr->next);;
 111                 clptr->next = clnew;
 112         }
 113
 114         /* Then, before releasing the lock, free the expired messages */
 115         while ((ChatQueue != NULL) && (now - ChatQueue->chat_time >= 120L)) {
 116                 clptr = ChatQueue;
 117                 ChatQueue = ChatQueue->next;
 118                 phree(clptr);
 119         }
 120         end_critical_section(S_CHATQUEUE);
 121 }
 122
 123
 124 t_context *find_context(char **unstr)
 125 {
 126         t_context *t_cc, *found_cc = NULL;
 127         char *name, *tptr;
 128
 129         if ((!*unstr) || (!unstr))
 130                 return (NULL);
 131
 132         begin_critical_section(S_SESSION_TABLE);
 133         for (t_cc = ContextList; ((t_cc) && (!found_cc)); t_cc = t_cc->next) {
 134                 if (t_cc->fake_username[0])
 135                         name = t_cc->fake_username;
 136                 else
 137                         name = t_cc->curr_user;
 138                 tptr = *unstr;
 139                 if ((!strncasecmp(name, tptr, strlen(name))) && (tptr[strlen(name)] == ' ')) {
 140                         found_cc = t_cc;
 141                         *unstr = &(tptr[strlen(name) + 1]);
 142                 }
 143         }
 144         end_critical_section(S_SESSION_TABLE);
 145
 146         return (found_cc);
 147 }
 148
 149 /*
 150  * List users in chat.
 151  * allflag ==   0 = list users in chat
 152  *              1 = list users in chat, followed by users not in chat
 153  *              2 = display count only
 154  */
 155
 156 void do_chat_listing(int allflag)
 157 {
 158         struct CitContext *ccptr;
 159         int count = 0;
 160         int count_elsewhere = 0;
 161         char roomname[ROOMNAMELEN];
 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 (ccptr->cs_flags & CS_CHAT) {
 168                         if (!strcasecmp(ccptr->quickroom.QRname,
 169                            CC->quickroom.QRname)) {
 170                                 ++count;
 171                         }
 172                         else {
 173                                 ++count_elsewhere;
 174                         }
 175                 }
 176
 177                 GenerateRoomDisplay(roomname, ccptr, CC);
 178                 if ((CC->usersupp.axlevel < 6)
 179                    && (strlen(ccptr->fake_roomname)>0)) {
 180                         strcpy(roomname, ccptr->fake_roomname);
 181                 }
 182
 183                 if ((ccptr->cs_flags & CS_CHAT)
 184                     && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 185                         if ((allflag == 0) || (allflag == 1)) {
 186                                 cprintf(":| %-25s <%s>:\n",
 187                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 188                                         roomname);
 189                         }
 190                 }
 191         }
 192
 193         if (allflag == 1) {
 194                 cprintf(":|\n:| Users not in chat:\n");
 195                 for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 196
 197                         GenerateRoomDisplay(roomname, ccptr, CC);
 198                         if ((CC->usersupp.axlevel < 6)
 199                         && (strlen(ccptr->fake_roomname)>0)) {
 200                                 strcpy(roomname, ccptr->fake_roomname);
 201                         }
 202
 203                         if (((ccptr->cs_flags & CS_CHAT) == 0)
 204                             && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 205                                 cprintf(":| %-25s <%s>:\n",
 206                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 207                                         roomname);
 208                         }
 209                 }
 210         }
 211         end_critical_section(S_SESSION_TABLE);
 212
 213         if (allflag == 2) {
 214                 if (count > 1) {
 215                         cprintf(":|There are %d users here.\n", count);
 216                 }
 217                 else {
 218                         cprintf(":|Note: you are the only one here.\n");
 219                 }
 220                 if (count_elsewhere > 0) {
 221                         cprintf(":|There are %d users chatting in other rooms.\n", count_elsewhere);
 222                 }
 223         }
 224
 225         cprintf(":|\n");
 226 }
 227
 228
 229 void cmd_chat(char *argbuf)
 230 {
 231         char cmdbuf[SIZ];
 232         char *un;
 233         char *strptr1;
 234         int MyLastMsg, ThisLastMsg;
 235         struct ChatLine *clptr;
 236         struct CitContext *t_context;
 237         int retval;
 238
 239         if (!(CC->logged_in)) {
 240                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 241                 return;
 242         }
 243
 244         CC->cs_flags = CC->cs_flags | CS_CHAT;
 245         cprintf("%d Entering chat mode (type '/help' for available commands)\n",
 246                 START_CHAT_MODE);
 247
 248         MyLastMsg = ChatLastMsg;
 249
 250         if ((CC->cs_flags & CS_STEALTH) == 0) {
 251                 allwrite("<entering chat>", 0, NULL);
 252         }
 253         strcpy(cmdbuf, "");
 254
 255         do_chat_listing(2);
 256
 257         while (1) {
 258                 int ok_cmd;
 259                 int linelen;
 260
 261                 ok_cmd = 0;
 262                 linelen = strlen(cmdbuf);
 263                 if (linelen > 100) --linelen;   /* truncate too-long lines */
 264                 cmdbuf[linelen + 1] = 0;
 265
 266                 retval = client_read_to(&cmdbuf[linelen], 1, 2);
 267
 268                 if (retval < 0) {       /* socket broken? */
 269                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 270                                 allwrite("<disconnected>", 0, NULL);
 271                         }
 272                         return;
 273                 }
 274
 275                 /* if we have a complete line, do send processing */
 276                 if (strlen(cmdbuf) > 0)
 277                         if (cmdbuf[strlen(cmdbuf) - 1] == 10) {
 278                                 cmdbuf[strlen(cmdbuf) - 1] = 0;
 279                                 time(&CC->lastcmd);
 280                                 time(&CC->lastidle);
 281
 282                                 if ((!strcasecmp(cmdbuf, "exit"))
 283                                     || (!strcasecmp(cmdbuf, "/exit"))
 284                                     || (!strcasecmp(cmdbuf, "quit"))
 285                                     || (!strcasecmp(cmdbuf, "logout"))
 286                                     || (!strcasecmp(cmdbuf, "logoff"))
 287                                     || (!strcasecmp(cmdbuf, "/q"))
 288                                     || (!strcasecmp(cmdbuf, ".q"))
 289                                     || (!strcasecmp(cmdbuf, "/quit"))
 290                                     )
 291                                         strcpy(cmdbuf, "000");
 292
 293                                 if (!strcmp(cmdbuf, "000")) {
 294                                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 295                                                 allwrite("<exiting chat>", 0, NULL);
 296                                         }
 297                                         sleep(1);
 298                                         cprintf("000\n");
 299                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 300                                         return;
 301                                 }
 302                                 if ((!strcasecmp(cmdbuf, "/help"))
 303                                     || (!strcasecmp(cmdbuf, "help"))
 304                                     || (!strcasecmp(cmdbuf, "/?"))
 305                                     || (!strcasecmp(cmdbuf, "?"))) {
 306                                         cprintf(":|\n");
 307                                         cprintf(":|Available commands: \n");
 308                                         cprintf(":|/help   (prints this message) \n");
 309                                         cprintf(":|/who    (list users currently in chat) \n");
 310                                         cprintf(":|/whobbs (list users in chat -and- elsewhere) \n");
 311                                         cprintf(":|/me     ('action' line, ala irc) \n");
 312                                         cprintf(":|/msg    (send private message, ala irc) \n");
 313                                         cprintf(":|/quit   (return to the BBS) \n");
 314                                         cprintf(":|\n");
 315                                         ok_cmd = 1;
 316                                 }
 317                                 if (!strcasecmp(cmdbuf, "/who")) {
 318                                         do_chat_listing(0);
 319                                         ok_cmd = 1;
 320                                 }
 321                                 if (!strcasecmp(cmdbuf, "/whobbs")) {
 322                                         do_chat_listing(1);
 323                                         ok_cmd = 1;
 324                                 }
 325                                 if (!strncasecmp(cmdbuf, "/me ", 4)) {
 326                                         allwrite(&cmdbuf[4], 1, NULL);
 327                                         ok_cmd = 1;
 328                                 }
 329                                 if (!strncasecmp(cmdbuf, "/msg ", 5)) {
 330                                         ok_cmd = 1;
 331                                         strptr1 = &cmdbuf[5];
 332                                         if ((t_context = find_context(&strptr1))) {
 333                                                 allwrite(strptr1, 2, CC->curr_user);
 334                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 335                                                         allwrite(strptr1, 2, t_context->curr_user);
 336                                         } else
 337                                                 cprintf(":|User not found.\n", cmdbuf);
 338                                         cprintf("\n");
 339                                 }
 340                                 if ((cmdbuf[0] != '/') && (strlen(cmdbuf) > 0)) {
 341                                         ok_cmd = 1;
 342                                         allwrite(cmdbuf, 0, NULL);
 343                                 }
 344                                 if ((!ok_cmd) && (cmdbuf[0]) && (cmdbuf[0] != '\n'))
 345                                         cprintf(":|Command %s is not understood.\n", cmdbuf);
 346
 347                                 strcpy(cmdbuf, "");
 348
 349                         }
 350                 /* now check the queue for new incoming stuff */
 351
 352                 if (CC->fake_username[0])
 353                         un = CC->fake_username;
 354                 else
 355                         un = CC->curr_user;
 356                 if (ChatLastMsg > MyLastMsg) {
 357                         ThisLastMsg = ChatLastMsg;
 358                         for (clptr = ChatQueue; clptr != NULL; clptr = clptr->next) {
 359                                 if ((clptr->chat_seq > MyLastMsg) && ((!clptr->chat_username[0]) || (!strncasecmp(un, clptr->chat_username, 32)))) {
 360                                         if ((!clptr->chat_room[0]) || (!strncasecmp(CC->quickroom.QRname, clptr->chat_room, ROOMNAMELEN))) {
 361                                                 cprintf("%s\n", clptr->chat_text);
 362                                         }
 363                                 }
 364                         }
 365                         MyLastMsg = ThisLastMsg;
 366                 }
 367         }
 368 }
 369
 370
 371
 372 /*
 373  * Delete any remaining express messages
 374  */
 375 void delete_express_messages(void) {
 376         struct ExpressMessage *ptr;
 377
 378         begin_critical_section(S_SESSION_TABLE);
 379         while (CC->FirstExpressMessage != NULL) {
 380                 ptr = CC->FirstExpressMessage->next;
 381                 if (CC->FirstExpressMessage->text != NULL)
 382                         phree(CC->FirstExpressMessage->text);
 383                 phree(CC->FirstExpressMessage);
 384                 CC->FirstExpressMessage = ptr;
 385                 }
 386         end_critical_section(S_SESSION_TABLE);
 387         }
 388
 389
 390
 391
 392 /*
 393  * Poll for express messages (OLD METHOD -- ***DEPRECATED ***)
 394  */
 395 void cmd_pexp(char *argbuf)
 396 {
 397         struct ExpressMessage *ptr, *holdptr;
 398
 399         if (CC->FirstExpressMessage == NULL) {
 400                 cprintf("%d No express messages waiting.\n", ERROR);
 401                 return;
 402         }
 403         begin_critical_section(S_SESSION_TABLE);
 404         ptr = CC->FirstExpressMessage;
 405         CC->FirstExpressMessage = NULL;
 406         end_critical_section(S_SESSION_TABLE);
 407
 408         cprintf("%d Express msgs:\n", LISTING_FOLLOWS);
 409         while (ptr != NULL) {
 410                 if (ptr->flags && EM_BROADCAST)
 411                         cprintf("Broadcast message ");
 412                 else if (ptr->flags && EM_CHAT)
 413                         cprintf("Chat request ");
 414                 else if (ptr->flags && EM_GO_AWAY)
 415                         cprintf("Please logoff now, as requested ");
 416                 else
 417                         cprintf("Message ");
 418                 cprintf("from %s:\n", ptr->sender);
 419                 if (ptr->text != NULL)
 420                         memfmout(80, ptr->text, 0, "\n");
 421
 422                 holdptr = ptr->next;
 423                 if (ptr->text != NULL) phree(ptr->text);
 424                 phree(ptr);
 425                 ptr = holdptr;
 426         }
 427         cprintf("000\n");
 428 }
 429
 430
 431 /*
 432  * Get express messages (new method)
 433  */
 434 void cmd_gexp(char *argbuf) {
 435         struct ExpressMessage *ptr;
 436
 437         if (CC->FirstExpressMessage == NULL) {
 438                 cprintf("%d No express messages waiting.\n", ERROR);
 439                 return;
 440         }
 441
 442         begin_critical_section(S_SESSION_TABLE);
 443         ptr = CC->FirstExpressMessage;
 444         CC->FirstExpressMessage = CC->FirstExpressMessage->next;
 445         end_critical_section(S_SESSION_TABLE);
 446
 447         cprintf("%d %d|%ld|%d|%s|%s\n",
 448                 LISTING_FOLLOWS,
 449                 ((ptr->next != NULL) ? 1 : 0),          /* more msgs? */
 450                 ptr->timestamp,                         /* time sent */
 451                 ptr->flags,                             /* flags */
 452                 ptr->sender,                            /* sender of msg */
 453                 config.c_nodename);                     /* static for now */
 454         if (ptr->text != NULL) {
 455                 memfmout(80, ptr->text, 0, "\n");
 456                 if (ptr->text[strlen(ptr->text)-1] != '\n') cprintf("\n");
 457                 phree(ptr->text);
 458                 }
 459         cprintf("000\n");
 460         phree(ptr);
 461 }
 462
 463 /*
 464  * Asynchronously deliver express messages'
 465  */
 466 void cmd_gexp_async(void) {
 467
 468         /* Only do this if the session can handle asynchronous protocol */
 469         if (CC->is_async == 0) return;
 470
 471         /* And don't do it if there's nothing to send. */
 472         if (CC->FirstExpressMessage == NULL) return;
 473
 474         cprintf("%d express msg\n", ASYNC_MSG + ASYNC_GEXP);
 475         cmd_gexp("");
 476 }
 477
 478 /*
 479  * Back end support function for send_express_message() and company
 480  */
 481 void add_xmsg_to_context(struct CitContext *ccptr,
 482                         struct ExpressMessage *newmsg)
 483 {
 484         struct ExpressMessage *findend;
 485
 486         if (ccptr->FirstExpressMessage == NULL) {
 487                 ccptr->FirstExpressMessage = newmsg;
 488         }
 489         else {
 490                 findend = ccptr->FirstExpressMessage;
 491                 while (findend->next != NULL) {
 492                         findend = findend->next;
 493                 }
 494                 findend->next = newmsg;
 495         }
 496 }
 497
 498
 499
 500
 501 /*
 502  * This is the back end to the express message sending function.
 503  * Returns the number of users to which the message was sent.
 504  * Sending a zero-length message tests for recipients without sending messages.
 505  */
 506 int send_express_message(char *lun, char *x_user, char *x_msg)
 507 {
 508         int message_sent = 0;           /* number of successful sends */
 509
 510         struct CitContext *ccptr;
 511         struct ExpressMessage *newmsg;
 512         char *un;
 513         size_t msglen = 0;
 514         int do_send = 0;                /* set to 1 to actually page, not
 515                                          * just check to see if we can.
 516                                          */
 517         struct savelist *sl = NULL;     /* list of rooms to save this page */
 518         struct savelist *sptr;
 519         struct CtdlMessage *logmsg;
 520         long msgnum;
 521
 522         if (strlen(x_msg) > 0) {
 523                 msglen = strlen(x_msg) + 4;
 524                 do_send = 1;
 525                 }
 526
 527         /* find the target user's context and append the message */
 528         begin_critical_section(S_SESSION_TABLE);
 529         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 530
 531                 if (ccptr->fake_username[0])    /* <bc> */
 532                         un = ccptr->fake_username;
 533                 else
 534                         un = ccptr->usersupp.fullname;
 535
 536                 if ( ((!strcasecmp(un, x_user))
 537                     || (!strcasecmp(x_user, "broadcast")))
 538                     && ((ccptr->disable_exp == 0)
 539                     || (CC->usersupp.axlevel >= 6)) ) {
 540                         if (do_send) {
 541                                 newmsg = (struct ExpressMessage *)
 542                                         mallok(sizeof (struct ExpressMessage));
 543                                 memset(newmsg, 0,
 544                                         sizeof (struct ExpressMessage));
 545                                 time(&(newmsg->timestamp));
 546                                 safestrncpy(newmsg->sender, lun,
 547                                             sizeof newmsg->sender);
 548                                 if (!strcasecmp(x_user, "broadcast"))
 549                                         newmsg->flags |= EM_BROADCAST;
 550                                 newmsg->text = strdoop(x_msg);
 551
 552                                 add_xmsg_to_context(ccptr, newmsg);
 553
 554                                 /* and log it ... */
 555                                 if (ccptr != CC) {
 556                                         sptr = (struct savelist *)
 557                                                 malloc(sizeof(struct savelist));
 558                                         sptr->next = sl;
 559                                         MailboxName(sptr->roomname,
 560                                                 &ccptr->usersupp, PAGELOGROOM);
 561                                         sl = sptr;
 562                                 }
 563                         }
 564                         ++message_sent;
 565                 }
 566         }
 567         end_critical_section(S_SESSION_TABLE);
 568
 569         /* Log the page to disk if configured to do so  */
 570         if ( (do_send) && (message_sent) ) {
 571
 572                 logmsg = mallok(sizeof(struct CtdlMessage));
 573                 memset(logmsg, 0, sizeof(struct CtdlMessage));
 574                 logmsg->cm_magic = CTDLMESSAGE_MAGIC;
 575                 logmsg->cm_anon_type = MES_NORMAL;
 576                 logmsg->cm_format_type = 0;
 577                 logmsg->cm_fields['A'] = strdoop(lun);
 578                 logmsg->cm_fields['N'] = strdoop(NODENAME);
 579                 logmsg->cm_fields['O'] = strdoop(PAGELOGROOM);
 580                 logmsg->cm_fields['R'] = strdoop(x_user);
 581                 logmsg->cm_fields['M'] = strdoop(x_msg);
 582
 583
 584                 /* Save a copy of the message in the sender's log room,
 585                  * creating the room if necessary.
 586                  */
 587                 create_room(PAGELOGROOM, 4, "", 0, 1);
 588                 msgnum = CtdlSaveMsg(logmsg, "", PAGELOGROOM, MES_LOCAL);
 589
 590                 /* Now save a copy in the global log room, if configured */
 591                 if (strlen(config.c_logpages) > 0) {
 592                         create_room(config.c_logpages, 3, "", 0, 1);
 593                         CtdlSaveMsgPointerInRoom(config.c_logpages, msgnum, 0);
 594                 }
 595
 596                 /* Save a copy in each recipient's log room, creating those
 597                  * rooms if necessary.  Note that we create as a type 5 room
 598                  * rather than 4, which indicates that it's a personal room
 599                  * but we've already supplied the namespace prefix.
 600                  */
 601                 while (sl != NULL) {
 602                         create_room(sl->roomname, 5, "", 0, 1);
 603                         CtdlSaveMsgPointerInRoom(sl->roomname, msgnum, 0);
 604                         sptr = sl->next;
 605                         phree(sl);
 606                         sl = sptr;
 607                 }
 608
 609                 CtdlFreeMessage(logmsg);
 610         }
 611
 612         return (message_sent);
 613 }
 614
 615 /*
 616  * send express messages  <bc>
 617  */
 618 void cmd_sexp(char *argbuf)
 619 {
 620         int message_sent = 0;
 621         char x_user[SIZ];
 622         char x_msg[SIZ];
 623         char *lun;              /* <bc> */
 624         char *x_big_msgbuf = NULL;
 625
 626         if ((!(CC->logged_in)) && (!(CC->internal_pgm))) {
 627                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 628                 return;
 629         }
 630         if (CC->fake_username[0])
 631                 lun = CC->fake_username;
 632         else
 633                 lun = CC->usersupp.fullname;
 634
 635         extract(x_user, argbuf, 0);
 636
 637         extract(x_msg, argbuf, 1);
 638
 639         if (!x_user[0]) {
 640                 cprintf("%d You were not previously paged.\n", ERROR);
 641                 return;
 642         }
 643         if ((!strcasecmp(x_user, "broadcast")) && (CC->usersupp.axlevel < 6)) {
 644                 cprintf("%d Higher access required to send a broadcast.\n",
 645                         ERROR + HIGHER_ACCESS_REQUIRED);
 646                 return;
 647         }
 648         /* This loop handles text-transfer pages */
 649         if (!strcmp(x_msg, "-")) {
 650                 message_sent = PerformXmsgHooks(lun, x_user, "");
 651                 if (message_sent == 0) {
 652                         cprintf("%d '%s' is not logged in "
 653                                 "or is not accepting pages.\n",
 654                                 ERROR, x_user);
 655                         return;
 656                 }
 657                 cprintf("%d Transmit message (will deliver to %d users)\n",
 658                         SEND_LISTING, message_sent);
 659                 x_big_msgbuf = mallok(SIZ);
 660                 memset(x_big_msgbuf, 0, SIZ);
 661                 while (client_gets(x_msg), strcmp(x_msg, "000")) {
 662                         x_big_msgbuf = reallok(x_big_msgbuf,
 663                                strlen(x_big_msgbuf) + strlen(x_msg) + 4);
 664                         if (strlen(x_big_msgbuf) > 0)
 665                            if (x_big_msgbuf[strlen(x_big_msgbuf)] != '\n')
 666                                 strcat(x_big_msgbuf, "\n");
 667                         strcat(x_big_msgbuf, x_msg);
 668                 }
 669                 PerformXmsgHooks(lun, x_user, x_big_msgbuf);
 670                 phree(x_big_msgbuf);
 671
 672                 /* This loop handles inline pages */
 673         } else {
 674                 message_sent = PerformXmsgHooks(lun, x_user, x_msg);
 675
 676                 if (message_sent > 0) {
 677                         if (strlen(x_msg) > 0)
 678                                 cprintf("%d Message sent", OK);
 679                         else
 680                                 cprintf("%d Ok to send message", OK);
 681                         if (message_sent > 1)
 682                                 cprintf(" to %d users", message_sent);
 683                         cprintf(".\n");
 684                 } else {
 685                         cprintf("%d '%s' is not logged in "
 686                                 "or is not accepting pages.\n",
 687                                 ERROR, x_user);
 688                 }
 689
 690
 691         }
 692 }
 693
 694
 695
 696 /*
 697  * Enter or exit paging-disabled mode
 698  */
 699 void cmd_dexp(char *argbuf)
 700 {
 701         int new_state;
 702
 703         if (!CC->logged_in) {
 704                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 705                 return;
 706                 }
 707
 708         new_state = extract_int(argbuf, 0);
 709         if ((new_state == 0) || (new_state == 1)) {
 710                 CC->disable_exp = new_state;
 711                 }
 712         cprintf("%d %d\n", OK, CC->disable_exp);
 713         }
 714
 715
 716 /*
 717  * Request client termination
 718  */
 719 void cmd_reqt(char *argbuf) {
 720         struct CitContext *ccptr;
 721         int sessions = 0;
 722         int which_session;
 723         struct ExpressMessage *newmsg;
 724
 725         if (CtdlAccessCheck(ac_aide)) return;
 726         which_session = extract_int(argbuf, 0);
 727
 728         begin_critical_section(S_SESSION_TABLE);
 729         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 730                 if ((ccptr->cs_pid == which_session) || (which_session == 0)) {
 731
 732                         newmsg = (struct ExpressMessage *)
 733                                 mallok(sizeof (struct ExpressMessage));
 734                         memset(newmsg, 0,
 735                                 sizeof (struct ExpressMessage));
 736                         time(&(newmsg->timestamp));
 737                         safestrncpy(newmsg->sender, CC->usersupp.fullname,
 738                                     sizeof newmsg->sender);
 739                         newmsg->flags |= EM_GO_AWAY;
 740                         newmsg->text = strdoop("Automatic logoff requested.");
 741
 742                         add_xmsg_to_context(ccptr, newmsg);
 743                         ++sessions;
 744
 745                 }
 746         }
 747         end_critical_section(S_SESSION_TABLE);
 748         cprintf("%d Sent termination request to %d sessions.\n", OK, sessions);
 749 }
 750
 751
 752
 753 char *Dynamic_Module_Init(void)
 754 {
 755         CtdlRegisterProtoHook(cmd_chat, "CHAT", "Begin real-time chat");
 756         CtdlRegisterProtoHook(cmd_pexp, "PEXP", "Poll for express messages");
 757         CtdlRegisterProtoHook(cmd_gexp, "GEXP", "Get express messages");
 758         CtdlRegisterProtoHook(cmd_sexp, "SEXP", "Send an express message");
 759         CtdlRegisterProtoHook(cmd_dexp, "DEXP", "Disable express messages");
 760         CtdlRegisterProtoHook(cmd_reqt, "REQT", "Request client termination");
 761         CtdlRegisterSessionHook(cmd_gexp_async, EVT_CMD);
 762         CtdlRegisterSessionHook(delete_express_messages, EVT_STOP);
 763         CtdlRegisterXmsgHook(send_express_message, XMSG_PRI_LOCAL);
 764         return "$Id$";
 765 }
 766