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 char *Dynamic_Module_Init(void)
  46 {
  47         CtdlSendExpressMessageFunc = send_express_message;
  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         return "$Id$";
  55 }
  56
  57 void allwrite(char *cmdbuf, int flag, char *roomname, char *username)
  58 {
  59         FILE *fp;
  60         char bcast[256];
  61         char *un;
  62         struct ChatLine *clptr, *clnew;
  63         time_t now;
  64
  65         if (CC->fake_username[0])
  66                 un = CC->fake_username;
  67         else
  68                 un = CC->usersupp.fullname;
  69         if (flag == 1) {
  70                 snprintf(bcast, sizeof bcast, ":|<%s %s>", un, cmdbuf);
  71         } else if (flag == 0) {
  72                 snprintf(bcast, sizeof bcast, "%s|%s", un, cmdbuf);
  73         } else if (flag == 2) {
  74                 snprintf(bcast, sizeof bcast, ":|<%s whispers %s>", un, cmdbuf);
  75         }
  76         if ((strcasecmp(cmdbuf, "NOOP")) && (flag != 2)) {
  77                 fp = fopen(CHATLOG, "a");
  78                 fprintf(fp, "%s\n", bcast);
  79                 fclose(fp);
  80         }
  81         clnew = (struct ChatLine *) mallok(sizeof(struct ChatLine));
  82         memset(clnew, 0, sizeof(struct ChatLine));
  83         if (clnew == NULL) {
  84                 fprintf(stderr, "citserver: cannot alloc chat line: %s\n",
  85                         strerror(errno));
  86                 return;
  87         }
  88         time(&now);
  89         clnew->next = NULL;
  90         clnew->chat_time = now;
  91         strncpy(clnew->chat_room, roomname, sizeof clnew->chat_room);
  92         clnew->chat_room[sizeof clnew->chat_room - 1] = 0;
  93         if (username) {
  94                 strncpy(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 (1) {
 116                 if (ChatQueue == NULL)
 117                         goto DONE_FREEING;
 118                 if ((now - ChatQueue->chat_time) < 120L)
 119                         goto DONE_FREEING;
 120                 clptr = ChatQueue;
 121                 ChatQueue = ChatQueue->next;
 122                 phree(clptr);
 123         }
 124       DONE_FREEING:end_critical_section(S_CHATQUEUE);
 125 }
 126
 127
 128 t_context *find_context(char **unstr)
 129 {
 130         t_context *t_cc, *found_cc = NULL;
 131         char *name, *tptr;
 132
 133         if ((!*unstr) || (!unstr))
 134                 return (NULL);
 135
 136         begin_critical_section(S_SESSION_TABLE);
 137         for (t_cc = ContextList; ((t_cc) && (!found_cc)); t_cc = t_cc->next) {
 138                 if (t_cc->fake_username[0])
 139                         name = t_cc->fake_username;
 140                 else
 141                         name = t_cc->curr_user;
 142                 tptr = *unstr;
 143                 if ((!strncasecmp(name, tptr, strlen(name))) && (tptr[strlen(name)] == ' ')) {
 144                         found_cc = t_cc;
 145                         *unstr = &(tptr[strlen(name) + 1]);
 146                 }
 147         }
 148         end_critical_section(S_SESSION_TABLE);
 149
 150         return (found_cc);
 151 }
 152
 153 /*
 154  * List users in chat.
 155  * allflag ==   0 = list users in chat
 156  *              1 = list users in chat, followed by users not in chat
 157  *              2 = display count only
 158  */
 159
 160 void do_chat_listing(int allflag)
 161 {
 162         struct CitContext *ccptr;
 163         int count = 0;
 164
 165         if ((allflag == 0) || (allflag == 1))
 166                 cprintf(":|\n:| Users currently in chat:\n");
 167         begin_critical_section(S_SESSION_TABLE);
 168         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 169                 if (!strcasecmp(ccptr->cs_room, "<chat>")) ++count;
 170                 if ((!strcasecmp(ccptr->cs_room, "<chat>"))
 171                     && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 172                         if ((allflag == 0) || (allflag == 1))
 173                                 cprintf(":| %-25s <%s>\n", (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user, ccptr->chat_room);
 174                 }
 175         }
 176
 177         if (allflag == 1) {
 178                 cprintf(":|\n:| Users not in chat:\n");
 179                 for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 180                         if ((strcasecmp(ccptr->cs_room, "<chat>"))
 181                             && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 182                                 cprintf(":| %-25s <%s>:\n", (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user, (ccptr->fake_roomname[0]) ? ccptr->fake_roomname : ccptr->cs_room);
 183                         }
 184                 }
 185         }
 186         end_critical_section(S_SESSION_TABLE);
 187
 188         if (allflag == 2) {
 189                 if (count > 1)
 190                         cprintf(":|There are %d users here.\n", count);
 191                 else
 192                         cprintf(":|Note: you are the only one here.\n");
 193         }
 194
 195         cprintf(":|\n");
 196 }
 197
 198
 199 void cmd_chat(char *argbuf)
 200 {
 201         char cmdbuf[256];
 202         char *un;
 203         char *strptr1;
 204         char hold_cs_room[ROOMNAMELEN];
 205         int MyLastMsg, ThisLastMsg;
 206         struct ChatLine *clptr;
 207         struct CitContext *t_context;
 208         int retval;
 209
 210         if (!(CC->logged_in)) {
 211                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 212                 return;
 213         }
 214         strcpy(CC->chat_room, "Main room");
 215
 216         safestrncpy(hold_cs_room, CC->cs_room, sizeof hold_cs_room);
 217         CC->cs_flags = CC->cs_flags | CS_CHAT;
 218         set_wtmpsupp("<chat>");
 219         cprintf("%d Entering chat mode (type '/help' for available commands)\n",
 220                 START_CHAT_MODE);
 221
 222         MyLastMsg = ChatLastMsg;
 223
 224         if ((CC->cs_flags & CS_STEALTH) == 0) {
 225                 allwrite("<entering chat>", 0, CC->chat_room, NULL);
 226         }
 227         strcpy(cmdbuf, "");
 228
 229         do_chat_listing(2);
 230
 231         while (1) {
 232                 int ok_cmd;
 233
 234                 ok_cmd = 0;
 235                 cmdbuf[strlen(cmdbuf) + 1] = 0;
 236                 retval = client_read_to(&cmdbuf[strlen(cmdbuf)], 1, 2);
 237
 238                 /* if we have a complete line, do send processing */
 239                 if (strlen(cmdbuf) > 0)
 240                         if (cmdbuf[strlen(cmdbuf) - 1] == 10) {
 241                                 cmdbuf[strlen(cmdbuf) - 1] = 0;
 242                                 time(&CC->lastcmd);
 243                                 time(&CC->lastidle);
 244
 245                                 if ((!strcasecmp(cmdbuf, "exit"))
 246                                     || (!strcasecmp(cmdbuf, "/exit"))
 247                                     || (!strcasecmp(cmdbuf, "quit"))
 248                                     || (!strcasecmp(cmdbuf, "logout"))
 249                                     || (!strcasecmp(cmdbuf, "logoff"))
 250                                     || (!strcasecmp(cmdbuf, "/q"))
 251                                     || (!strcasecmp(cmdbuf, ".q"))
 252                                     || (!strcasecmp(cmdbuf, "/quit"))
 253                                     )
 254                                         strcpy(cmdbuf, "000");
 255
 256                                 if (!strcmp(cmdbuf, "000")) {
 257                                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 258                                                 allwrite("<exiting chat>", 0, CC->chat_room, NULL);
 259                                         }
 260                                         sleep(1);
 261                                         cprintf("000\n");
 262                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 263                                         set_wtmpsupp(hold_cs_room);
 264                                         return;
 265                                 }
 266                                 if ((!strcasecmp(cmdbuf, "/help"))
 267                                     || (!strcasecmp(cmdbuf, "help"))
 268                                     || (!strcasecmp(cmdbuf, "/?"))
 269                                     || (!strcasecmp(cmdbuf, "?"))) {
 270                                         cprintf(":|\n");
 271                                         cprintf(":|Available commands: \n");
 272                                         cprintf(":|/help   (prints this message) \n");
 273                                         cprintf(":|/who    (list users currently in chat) \n");
 274                                         cprintf(":|/whobbs (list users in chat -and- elsewhere) \n");
 275                                         cprintf(":|/me     ('action' line, ala irc) \n");
 276                                         cprintf(":|/msg    (send private message, ala irc) \n");
 277                                         cprintf(":|/join   (join new room) \n");
 278                                         cprintf(":|/quit   (return to the BBS) \n");
 279                                         cprintf(":|\n");
 280                                         ok_cmd = 1;
 281                                 }
 282                                 if (!strcasecmp(cmdbuf, "/who")) {
 283                                         do_chat_listing(0);
 284                                         ok_cmd = 1;
 285                                 }
 286                                 if (!strcasecmp(cmdbuf, "/whobbs")) {
 287                                         do_chat_listing(1);
 288                                         ok_cmd = 1;
 289                                 }
 290                                 if (!strncasecmp(cmdbuf, "/me ", 4)) {
 291                                         allwrite(&cmdbuf[4], 1, CC->chat_room, NULL);
 292                                         ok_cmd = 1;
 293                                 }
 294                                 if (!strncasecmp(cmdbuf, "/msg ", 5)) {
 295                                         ok_cmd = 1;
 296                                         strptr1 = &cmdbuf[5];
 297                                         if ((t_context = find_context(&strptr1))) {
 298                                                 allwrite(strptr1, 2, "", CC->curr_user);
 299                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 300                                                         allwrite(strptr1, 2, "", t_context->curr_user);
 301                                         } else
 302                                                 cprintf(":|User not found.\n", cmdbuf);
 303                                         cprintf("\n");
 304                                 }
 305                                 if (!strncasecmp(cmdbuf, "/join ", 6)) {
 306                                         ok_cmd = 1;
 307                                         allwrite("<changing rooms>", 0, CC->chat_room, NULL);
 308                                         if (!cmdbuf[6])
 309                                                 strcpy(CC->chat_room, "Main room");
 310                                         else {
 311                                                 strncpy(CC->chat_room, &cmdbuf[6],
 312                                                    sizeof CC->chat_room);
 313                                                 CC->chat_room[sizeof CC->chat_room - 1] = 0;
 314                                         }
 315                                         allwrite("<joining room>", 0, CC->chat_room, NULL);
 316                                         cprintf("\n");
 317                                 }
 318                                 if ((cmdbuf[0] != '/') && (strlen(cmdbuf) > 0)) {
 319                                         ok_cmd = 1;
 320                                         allwrite(cmdbuf, 0, CC->chat_room, NULL);
 321                                 }
 322                                 if ((!ok_cmd) && (cmdbuf[0]) && (cmdbuf[0] != '\n'))
 323                                         cprintf(":|Command %s is not understood.\n", cmdbuf);
 324
 325                                 strcpy(cmdbuf, "");
 326
 327                         }
 328                 /* now check the queue for new incoming stuff */
 329
 330                 if (CC->fake_username[0])
 331                         un = CC->fake_username;
 332                 else
 333                         un = CC->curr_user;
 334                 if (ChatLastMsg > MyLastMsg) {
 335                         ThisLastMsg = ChatLastMsg;
 336                         for (clptr = ChatQueue; clptr != NULL; clptr = clptr->next) {
 337                                 if ((clptr->chat_seq > MyLastMsg) && ((!clptr->chat_username[0]) || (!strncasecmp(un, clptr->chat_username, 32)))) {
 338                                         if ((!clptr->chat_room[0]) || (!strncasecmp(CC->chat_room, clptr->chat_room, ROOMNAMELEN))) {
 339                                                 cprintf("%s\n", clptr->chat_text);
 340                                         }
 341                                 }
 342                         }
 343                         MyLastMsg = ThisLastMsg;
 344                 }
 345         }
 346 }
 347
 348
 349
 350 /*
 351  * Delete any remaining express messages
 352  */
 353 void delete_express_messages(void) {
 354         struct ExpressMessage *ptr;
 355
 356         begin_critical_section(S_SESSION_TABLE);
 357         while (CC->FirstExpressMessage != NULL) {
 358                 ptr = CC->FirstExpressMessage->next;
 359                 if (CC->FirstExpressMessage->text != NULL)
 360                         phree(CC->FirstExpressMessage->text);
 361                 phree(CC->FirstExpressMessage);
 362                 CC->FirstExpressMessage = ptr;
 363                 }
 364         end_critical_section(S_SESSION_TABLE);
 365         }
 366
 367
 368
 369
 370 /*
 371  * Poll for express messages (OLD METHOD -- ***DEPRECATED ***)
 372  */
 373 void cmd_pexp(char *argbuf)
 374 {
 375         struct ExpressMessage *ptr, *holdptr;
 376
 377         if (CC->FirstExpressMessage == NULL) {
 378                 cprintf("%d No express messages waiting.\n", ERROR);
 379                 return;
 380         }
 381         begin_critical_section(S_SESSION_TABLE);
 382         ptr = CC->FirstExpressMessage;
 383         CC->FirstExpressMessage = NULL;
 384         end_critical_section(S_SESSION_TABLE);
 385
 386         cprintf("%d Express msgs:\n", LISTING_FOLLOWS);
 387         while (ptr != NULL) {
 388                 if (ptr->flags && EM_BROADCAST)
 389                         cprintf("Broadcast message ");
 390                 else if (ptr->flags && EM_CHAT)
 391                         cprintf("Chat request ");
 392                 else if (ptr->flags && EM_GO_AWAY)
 393                         cprintf("Please logoff now, as requested ");
 394                 else
 395                         cprintf("Message ");
 396                 cprintf("from %s:\n", ptr->sender);
 397                 if (ptr->text != NULL)
 398                         memfmout(80, ptr->text, 0);
 399
 400                 holdptr = ptr->next;
 401                 if (ptr->text != NULL) phree(ptr->text);
 402                 phree(ptr);
 403                 ptr = holdptr;
 404         }
 405         cprintf("000\n");
 406 }
 407
 408
 409 /*
 410  * Get express messages (new method)
 411  */
 412 void cmd_gexp(char *argbuf) {
 413         struct ExpressMessage *ptr;
 414
 415         if (CC->FirstExpressMessage == NULL) {
 416                 cprintf("%d No express messages waiting.\n", ERROR);
 417                 return;
 418         }
 419
 420         begin_critical_section(S_SESSION_TABLE);
 421         ptr = CC->FirstExpressMessage;
 422         CC->FirstExpressMessage = CC->FirstExpressMessage->next;
 423         end_critical_section(S_SESSION_TABLE);
 424
 425         cprintf("%d %d|%ld|%d|%s|%s\n",
 426                 LISTING_FOLLOWS,
 427                 ((ptr->next != NULL) ? 1 : 0),          /* more msgs? */
 428                 ptr->timestamp,                         /* time sent */
 429                 ptr->flags,                             /* flags */
 430                 ptr->sender,                            /* sender of msg */
 431                 config.c_nodename);                     /* static for now */
 432         if (ptr->text != NULL) {
 433                 memfmout(80, ptr->text, 0);
 434                 if (ptr->text[strlen(ptr->text)-1] != '\n') cprintf("\n");
 435                 phree(ptr->text);
 436                 }
 437         cprintf("000\n");
 438         phree(ptr);
 439 }
 440
 441
 442
 443 /*
 444  * This is the back end to the express message sending function.
 445  * Returns the number of users to which the message was sent.
 446  * Sending a zero-length message tests for recipients without sending messages.
 447  */
 448 int send_express_message(char *lun, char *x_user, char *x_msg)
 449 {
 450         int message_sent = 0;
 451         struct CitContext *ccptr;
 452         struct ExpressMessage *newmsg, *findend;
 453         char *un;
 454         FILE *fp;
 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                 fp = fopen(CC->temp, "wb");
 503                 fprintf(fp, "%c%c%c", 255, MES_NORMAL, 0);
 504                 fprintf(fp, "Psysop%c", 0);
 505                 fprintf(fp, "T%ld%c", (long)time(NULL), 0);
 506                 fprintf(fp, "A%s%c", lun, 0);
 507                 fprintf(fp, "R%s%c", x_user, 0);
 508                 fprintf(fp, "O%s%c", config.c_logpages, 0);
 509                 fprintf(fp, "N%s%c", NODENAME, 0);
 510                 fprintf(fp, "M%s\n%c", x_msg, 0);
 511                 fclose(fp);
 512                 save_message(CC->temp, "", config.c_logpages, MES_LOCAL, 1);
 513                 unlink(CC->temp);
 514         }
 515         return (message_sent);
 516 }
 517
 518 /*
 519  * send express messages  <bc>
 520  */
 521 void cmd_sexp(char *argbuf)
 522 {
 523         int message_sent = 0;
 524         char x_user[256];
 525         char x_msg[256];
 526         char *lun;              /* <bc> */
 527         char *x_big_msgbuf = NULL;
 528
 529         if ((!(CC->logged_in)) && (!(CC->internal_pgm))) {
 530                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 531                 return;
 532         }
 533         if (CC->fake_username[0])
 534                 lun = CC->fake_username;
 535         else
 536                 lun = CC->usersupp.fullname;
 537
 538         extract(x_user, argbuf, 0);
 539
 540         extract(x_msg, argbuf, 1);
 541
 542         if (!x_user[0]) {
 543                 cprintf("%d You were not previously paged.\n", ERROR);
 544                 return;
 545         }
 546         if ((!strcasecmp(x_user, "broadcast")) && (CC->usersupp.axlevel < 6)) {
 547                 cprintf("%d Higher access required to send a broadcast.\n",
 548                         ERROR + HIGHER_ACCESS_REQUIRED);
 549                 return;
 550         }
 551         /* This loop handles text-transfer pages */
 552         if (!strcmp(x_msg, "-")) {
 553                 message_sent = send_express_message(lun, x_user, "");
 554                 if (message_sent == 0) {
 555                         cprintf("%d No user '%s' logged in.\n", ERROR, x_user);
 556                         return;
 557                 }
 558                 cprintf("%d Transmit message (will deliver to %d users)\n",
 559                         SEND_LISTING, message_sent);
 560                 x_big_msgbuf = mallok(256);
 561                 memset(x_big_msgbuf, 0, 256);
 562                 while (client_gets(x_msg), strcmp(x_msg, "000")) {
 563                         x_big_msgbuf = reallok(x_big_msgbuf,
 564                                strlen(x_big_msgbuf) + strlen(x_msg) + 4);
 565                         if (strlen(x_big_msgbuf) > 0)
 566                            if (x_big_msgbuf[strlen(x_big_msgbuf)] != '\n')
 567                                 strcat(x_big_msgbuf, "\n");
 568                         strcat(x_big_msgbuf, x_msg);
 569                 }
 570                 send_express_message(lun, x_user, x_big_msgbuf);
 571                 phree(x_big_msgbuf);
 572
 573                 /* This loop handles inline pages */
 574         } else {
 575                 message_sent = send_express_message(lun, x_user, x_msg);
 576
 577                 if (message_sent > 0) {
 578                         if (strlen(x_msg) > 0)
 579                                 cprintf("%d Message sent", OK);
 580                         else
 581                                 cprintf("%d Ok to send message", OK);
 582                         if (message_sent > 1)
 583                                 cprintf(" to %d users", message_sent);
 584                         cprintf(".\n");
 585                 } else {
 586                         cprintf("%d No user '%s' logged in.\n", ERROR, x_user);
 587                 }
 588
 589
 590         }
 591 }