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 #define MODULE_NAME     "Chat module"
  46 #define MODULE_AUTHOR   "Art Cancro"
  47 #define MODULE_EMAIL    "ajc@uncnsrd.mt-kisco.ny.us"
  48 #define MAJOR_VERSION   2
  49 #define MINOR_VERSION   0
  50
  51 static struct DLModule_Info info =
  52 {
  53         MODULE_NAME,
  54         MODULE_AUTHOR,
  55         MODULE_EMAIL,
  56         MAJOR_VERSION,
  57         MINOR_VERSION
  58 };
  59
  60 struct DLModule_Info *Dynamic_Module_Init(void)
  61 {
  62         CtdlRegisterProtoHook(cmd_chat, "CHAT", "Begin real-time chat");
  63         CtdlRegisterProtoHook(cmd_pexp, "PEXP", "Poll for express messages");
  64         CtdlRegisterProtoHook(cmd_gexp, "GEXP", "Get express messages");
  65         CtdlRegisterProtoHook(cmd_sexp, "SEXP", "Send an express message");
  66         CtdlRegisterSessionHook(delete_express_messages, EVT_STOP);
  67         return &info;
  68 }
  69
  70 void allwrite(char *cmdbuf, int flag, char *roomname, char *username)
  71 {
  72         FILE *fp;
  73         char bcast[256];
  74         char *un;
  75         struct ChatLine *clptr, *clnew;
  76         time_t now;
  77
  78         if (CC->fake_username[0])
  79                 un = CC->fake_username;
  80         else
  81                 un = CC->usersupp.fullname;
  82         if (flag == 1) {
  83                 sprintf(bcast, ":|<%s %s>", un, cmdbuf);
  84         } else if (flag == 0) {
  85                 sprintf(bcast, "%s|%s", un, cmdbuf);
  86         } else if (flag == 2) {
  87                 sprintf(bcast, ":|<%s whispers %s>", un, cmdbuf);
  88         }
  89         if ((strcasecmp(cmdbuf, "NOOP")) && (flag != 2)) {
  90                 fp = fopen(CHATLOG, "a");
  91                 fprintf(fp, "%s\n", bcast);
  92                 fclose(fp);
  93         }
  94         clnew = (struct ChatLine *) mallok(sizeof(struct ChatLine));
  95         memset(clnew, 0, sizeof(struct ChatLine));
  96         if (clnew == NULL) {
  97                 fprintf(stderr, "citserver: cannot alloc chat line: %s\n",
  98                         strerror(errno));
  99                 return;
 100         }
 101         time(&now);
 102         clnew->next = NULL;
 103         clnew->chat_time = now;
 104         strncpy(clnew->chat_room, roomname, sizeof clnew->chat_room);
 105         clnew->chat_room[sizeof clnew->chat_room - 1] = 0;
 106         if (username) {
 107                 strncpy(clnew->chat_username, username,
 108                         sizeof clnew->chat_username);
 109                 clnew->chat_username[sizeof clnew->chat_username - 1] = 0;
 110         } else
 111                 clnew->chat_username[0] = '\0';
 112         strcpy(clnew->chat_text, bcast);
 113
 114         /* Here's the critical section.
 115          * First, add the new message to the queue...
 116          */
 117         begin_critical_section(S_CHATQUEUE);
 118         ++ChatLastMsg;
 119         clnew->chat_seq = ChatLastMsg;
 120         if (ChatQueue == NULL) {
 121                 ChatQueue = clnew;
 122         } else {
 123                 for (clptr = ChatQueue; clptr->next != NULL; clptr = clptr->next);;
 124                 clptr->next = clnew;
 125         }
 126
 127         /* Then, before releasing the lock, free the expired messages */
 128         while (1) {
 129                 if (ChatQueue == NULL)
 130                         goto DONE_FREEING;
 131                 if ((now - ChatQueue->chat_time) < 120L)
 132                         goto DONE_FREEING;
 133                 clptr = ChatQueue;
 134                 ChatQueue = ChatQueue->next;
 135                 phree(clptr);
 136         }
 137       DONE_FREEING:end_critical_section(S_CHATQUEUE);
 138 }
 139
 140
 141 t_context *find_context(char **unstr)
 142 {
 143         t_context *t_cc, *found_cc = NULL;
 144         char *name, *tptr;
 145
 146         if ((!*unstr) || (!unstr))
 147                 return (NULL);
 148
 149         begin_critical_section(S_SESSION_TABLE);
 150         for (t_cc = ContextList; ((t_cc) && (!found_cc)); t_cc = t_cc->next) {
 151                 if (t_cc->fake_username[0])
 152                         name = t_cc->fake_username;
 153                 else
 154                         name = t_cc->curr_user;
 155                 tptr = *unstr;
 156                 if ((!strncasecmp(name, tptr, strlen(name))) && (tptr[strlen(name)] == ' ')) {
 157                         found_cc = t_cc;
 158                         *unstr = &(tptr[strlen(name) + 1]);
 159                 }
 160         }
 161         end_critical_section(S_SESSION_TABLE);
 162
 163         return (found_cc);
 164 }
 165
 166 /*
 167  * List users in chat.  Setting allflag to 1 also lists users elsewhere.
 168  */
 169
 170 void do_chat_listing(int allflag)
 171 {
 172         struct CitContext *ccptr;
 173
 174         cprintf(":|\n:| Users currently in chat:\n");
 175         begin_critical_section(S_SESSION_TABLE);
 176         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 177                 if ((!strcasecmp(ccptr->cs_room, "<chat>"))
 178                     && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 179                         cprintf(":| %-25s <%s>\n", (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user, ccptr->chat_room);
 180                 }
 181         }
 182
 183         if (allflag == 1) {
 184                 cprintf(":|\n:| Users not in chat:\n");
 185                 for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 186                         if ((strcasecmp(ccptr->cs_room, "<chat>"))
 187                             && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 188                                 cprintf(":| %-25s <%s>:\n", (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user, (ccptr->fake_roomname[0]) ? ccptr->fake_roomname : ccptr->cs_room);
 189                         }
 190                 }
 191         }
 192         end_critical_section(S_SESSION_TABLE);
 193         cprintf(":|\n");
 194 }
 195
 196
 197 void cmd_chat(char *argbuf)
 198 {
 199         char cmdbuf[256];
 200         char *un;
 201         char *strptr1;
 202         char hold_cs_room[ROOMNAMELEN];
 203         int MyLastMsg, ThisLastMsg;
 204         struct ChatLine *clptr;
 205         struct CitContext *t_context;
 206         int retval;
 207
 208         if (!(CC->logged_in)) {
 209                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 210                 return;
 211         }
 212         strcpy(CC->chat_room, "Main room");
 213
 214         strcpy(hold_cs_room, CC->cs_room);
 215         CC->cs_flags = CC->cs_flags | CS_CHAT;
 216         set_wtmpsupp("<chat>");
 217         cprintf("%d Entering chat mode (type '/help' for available commands)\n",
 218                 START_CHAT_MODE);
 219
 220         MyLastMsg = ChatLastMsg;
 221
 222         if ((CC->cs_flags & CS_STEALTH) == 0) {
 223                 allwrite("<entering chat>", 0, CC->chat_room, NULL);
 224         }
 225         strcpy(cmdbuf, "");
 226
 227         while (1) {
 228                 int ok_cmd;
 229
 230                 ok_cmd = 0;
 231                 cmdbuf[strlen(cmdbuf) + 1] = 0;
 232                 retval = client_read_to(&cmdbuf[strlen(cmdbuf)], 1, 2);
 233
 234                 /* if we have a complete line, do send processing */
 235                 if (strlen(cmdbuf) > 0)
 236                         if (cmdbuf[strlen(cmdbuf) - 1] == 10) {
 237                                 cmdbuf[strlen(cmdbuf) - 1] = 0;
 238                                 time(&CC->lastcmd);
 239                                 time(&CC->lastidle);
 240
 241                                 if ((!strcasecmp(cmdbuf, "exit"))
 242                                     || (!strcasecmp(cmdbuf, "/exit"))
 243                                     || (!strcasecmp(cmdbuf, "quit"))
 244                                     || (!strcasecmp(cmdbuf, "logout"))
 245                                     || (!strcasecmp(cmdbuf, "logoff"))
 246                                     || (!strcasecmp(cmdbuf, "/q"))
 247                                     || (!strcasecmp(cmdbuf, ".q"))
 248                                     || (!strcasecmp(cmdbuf, "/quit"))
 249                                     )
 250                                         strcpy(cmdbuf, "000");
 251
 252                                 if (!strcmp(cmdbuf, "000")) {
 253                                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 254                                                 allwrite("<exiting chat>", 0, CC->chat_room, NULL);
 255                                         }
 256                                         sleep(1);
 257                                         cprintf("000\n");
 258                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 259                                         set_wtmpsupp(hold_cs_room);
 260                                         return;
 261                                 }
 262                                 if ((!strcasecmp(cmdbuf, "/help"))
 263                                     || (!strcasecmp(cmdbuf, "help"))
 264                                     || (!strcasecmp(cmdbuf, "/?"))
 265                                     || (!strcasecmp(cmdbuf, "?"))) {
 266                                         cprintf(":|\n");
 267                                         cprintf(":|Available commands: \n");
 268                                         cprintf(":|/help   (prints this message) \n");
 269                                         cprintf(":|/who    (list users currently in chat) \n");
 270                                         cprintf(":|/whobbs (list users in chat -and- elsewhere) \n");
 271                                         cprintf(":|/me     ('action' line, ala irc) \n");
 272                                         cprintf(":|/msg    (send private message, ala irc) \n");
 273                                         cprintf(":|/join   (join new room) \n");
 274                                         cprintf(":|/quit   (return to the BBS) \n");
 275                                         cprintf(":|\n");
 276                                         ok_cmd = 1;
 277                                 }
 278                                 if (!strcasecmp(cmdbuf, "/who")) {
 279                                         do_chat_listing(0);
 280                                         ok_cmd = 1;
 281                                 }
 282                                 if (!strcasecmp(cmdbuf, "/whobbs")) {
 283                                         do_chat_listing(1);
 284                                         ok_cmd = 1;
 285                                 }
 286                                 if (!strncasecmp(cmdbuf, "/me ", 4)) {
 287                                         allwrite(&cmdbuf[4], 1, CC->chat_room, NULL);
 288                                         ok_cmd = 1;
 289                                 }
 290                                 if (!strncasecmp(cmdbuf, "/msg ", 5)) {
 291                                         ok_cmd = 1;
 292                                         strptr1 = &cmdbuf[5];
 293                                         if ((t_context = find_context(&strptr1))) {
 294                                                 allwrite(strptr1, 2, "", CC->curr_user);
 295                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 296                                                         allwrite(strptr1, 2, "", t_context->curr_user);
 297                                         } else
 298                                                 cprintf(":|User not found.\n", cmdbuf);
 299                                         cprintf("\n");
 300                                 }
 301                                 if (!strncasecmp(cmdbuf, "/join ", 6)) {
 302                                         ok_cmd = 1;
 303                                         allwrite("<changing rooms>", 0, CC->chat_room, NULL);
 304                                         if (!cmdbuf[6])
 305                                                 strcpy(CC->chat_room, "Main room");
 306                                         else {
 307                                                 strncpy(CC->chat_room, &cmdbuf[6],
 308                                                    sizeof CC->chat_room);
 309                                                 CC->chat_room[sizeof CC->chat_room - 1] = 0;
 310                                         }
 311                                         allwrite("<joining room>", 0, CC->chat_room, NULL);
 312                                         cprintf("\n");
 313                                 }
 314                                 if ((cmdbuf[0] != '/') && (strlen(cmdbuf) > 0)) {
 315                                         ok_cmd = 1;
 316                                         allwrite(cmdbuf, 0, CC->chat_room, NULL);
 317                                 }
 318                                 if ((!ok_cmd) && (cmdbuf[0]) && (cmdbuf[0] != '\n'))
 319                                         cprintf(":|Command %s is not understood.\n", cmdbuf);
 320
 321                                 strcpy(cmdbuf, "");
 322
 323                         }
 324                 /* now check the queue for new incoming stuff */
 325
 326                 if (CC->fake_username[0])
 327                         un = CC->fake_username;
 328                 else
 329                         un = CC->curr_user;
 330                 if (ChatLastMsg > MyLastMsg) {
 331                         ThisLastMsg = ChatLastMsg;
 332                         for (clptr = ChatQueue; clptr != NULL; clptr = clptr->next) {
 333                                 if ((clptr->chat_seq > MyLastMsg) && ((!clptr->chat_username[0]) || (!strncasecmp(un, clptr->chat_username, 32)))) {
 334                                         if ((!clptr->chat_room[0]) || (!strncasecmp(CC->chat_room, clptr->chat_room, ROOMNAMELEN))) {
 335                                                 cprintf("%s\n", clptr->chat_text);
 336                                         }
 337                                 }
 338                         }
 339                         MyLastMsg = ThisLastMsg;
 340                 }
 341         }
 342 }
 343
 344
 345
 346 /*
 347  * Delete any remaining express messages
 348  */
 349 void delete_express_messages(void) {
 350         struct ExpressMessage *ptr;
 351
 352         begin_critical_section(S_SESSION_TABLE);
 353         while (CC->FirstExpressMessage != NULL) {
 354                 ptr = CC->FirstExpressMessage->next;
 355                 if (CC->FirstExpressMessage->text != NULL)
 356                         phree(CC->FirstExpressMessage->text);
 357                 phree(CC->FirstExpressMessage);
 358                 CC->FirstExpressMessage = ptr;
 359                 }
 360         end_critical_section(S_SESSION_TABLE);
 361         }
 362
 363
 364
 365
 366 /*
 367  * Poll for express messages (OLD METHOD -- ***DEPRECATED ***)
 368  */
 369 void cmd_pexp(char *argbuf)
 370 {
 371         struct ExpressMessage *ptr, *holdptr;
 372
 373         if (CC->FirstExpressMessage == NULL) {
 374                 cprintf("%d No express messages waiting.\n", ERROR);
 375                 return;
 376         }
 377         begin_critical_section(S_SESSION_TABLE);
 378         ptr = CC->FirstExpressMessage;
 379         CC->FirstExpressMessage = NULL;
 380         end_critical_section(S_SESSION_TABLE);
 381
 382         cprintf("%d Express msgs:\n", LISTING_FOLLOWS);
 383         while (ptr != NULL) {
 384                 if (ptr->flags && EM_BROADCAST)
 385                         cprintf("Broadcast message ");
 386                 else if (ptr->flags && EM_CHAT)
 387                         cprintf("Chat request ");
 388                 else if (ptr->flags && EM_GO_AWAY)
 389                         cprintf("Please logoff now, as requested ");
 390                 else
 391                         cprintf("Message ");
 392                 cprintf("from %s:\n", ptr->sender);
 393                 if (ptr->text != NULL)
 394                         memfmout(80, ptr->text, 0);
 395
 396                 holdptr = ptr->next;
 397                 if (ptr->text != NULL) phree(ptr->text);
 398                 phree(ptr);
 399                 ptr = holdptr;
 400         }
 401         cprintf("000\n");
 402 }
 403
 404
 405 /*
 406  * Get express messages (new method)
 407  */
 408 void cmd_gexp(char *argbuf) {
 409         struct ExpressMessage *ptr;
 410
 411         if (CC->FirstExpressMessage == NULL) {
 412                 cprintf("%d No express messages waiting.\n", ERROR);
 413                 return;
 414         }
 415
 416         begin_critical_section(S_SESSION_TABLE);
 417         ptr = CC->FirstExpressMessage;
 418         CC->FirstExpressMessage = CC->FirstExpressMessage->next;
 419         end_critical_section(S_SESSION_TABLE);
 420
 421         cprintf("%d %d|%ld|%d|%s|%s\n",
 422                 LISTING_FOLLOWS,
 423                 ((ptr->next != NULL) ? 1 : 0),          /* more msgs? */
 424                 ptr->timestamp,                         /* time sent */
 425                 ptr->flags,                             /* flags */
 426                 ptr->sender,                            /* sender of msg */
 427                 config.c_nodename);                     /* static for now */
 428         if (ptr->text != NULL) {
 429                 memfmout(80, ptr->text, 0);
 430                 if (ptr->text[strlen(ptr->text)-1] != '\n') cprintf("\n");
 431                 phree(ptr->text);
 432                 }
 433         cprintf("000\n");
 434         phree(ptr);
 435 }
 436
 437
 438
 439 /*
 440  * This is the back end to the express message sending function.
 441  * Returns the number of users to which the message was sent.
 442  * Sending a zero-length message tests for recipients without sending messages.
 443  */
 444 int send_express_message(char *lun, char *x_user, char *x_msg)
 445 {
 446         int message_sent = 0;
 447         struct CitContext *ccptr;
 448         struct ExpressMessage *newmsg, *findend;
 449         char *un;
 450         FILE *fp;
 451         size_t msglen = 0;
 452         int do_send = 0;
 453
 454         if (strlen(x_msg) > 0) {
 455                 msglen = strlen(x_msg) + 4;
 456                 do_send = 1;
 457                 }
 458
 459         /* find the target user's context and append the message */
 460         begin_critical_section(S_SESSION_TABLE);
 461         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 462
 463                 if (ccptr->fake_username[0])    /* <bc> */
 464                         un = ccptr->fake_username;
 465                 else
 466                         un = ccptr->usersupp.fullname;
 467
 468                 if ((!strcasecmp(un, x_user))
 469                     || (!strcasecmp(x_user, "broadcast"))) {
 470                         if (do_send) {
 471                                 newmsg = (struct ExpressMessage *)
 472                                         mallok(sizeof (struct ExpressMessage));
 473                                 memset(newmsg, 0,
 474                                         sizeof (struct ExpressMessage));
 475                                 strcpy(newmsg->sender, lun);
 476                                 if (!strcasecmp(x_user, "broadcast"))
 477                                         newmsg->flags |= EM_BROADCAST;
 478                                 newmsg->text = mallok(msglen);
 479                                 safestrncpy(newmsg->text, x_msg, msglen);
 480
 481                                 if (ccptr->FirstExpressMessage == NULL)
 482                                         ccptr->FirstExpressMessage = newmsg;
 483                                 else {
 484                                         findend = ccptr->FirstExpressMessage;
 485                                         while (findend->next != NULL)
 486                                                 findend = findend->next;
 487                                         findend->next = newmsg;
 488                                 }
 489                         }
 490                         ++message_sent;
 491                 }
 492         }
 493         end_critical_section(S_SESSION_TABLE);
 494
 495         /* Log the page to disk if configured to do so */
 496         if ((strlen(config.c_logpages) > 0) && (do_send) ) {
 497                 fp = fopen(CC->temp, "wb");
 498                 fprintf(fp, "%c%c%c", 255, MES_NORMAL, 0);
 499                 fprintf(fp, "Psysop%c", 0);
 500                 fprintf(fp, "T%ld%c", time(NULL), 0);
 501                 fprintf(fp, "A%s%c", lun, 0);
 502                 fprintf(fp, "R%s%c", x_user, 0);
 503                 fprintf(fp, "O%s%c", config.c_logpages, 0);
 504                 fprintf(fp, "N%s%c", NODENAME, 0);
 505                 fprintf(fp, "M%s\n%c", x_msg, 0);
 506                 fclose(fp);
 507                 save_message(CC->temp, "", config.c_logpages, M_LOCAL, 1);
 508                 unlink(CC->temp);
 509         }
 510         return (message_sent);
 511 }
 512
 513 /*
 514  * send express messages  <bc>
 515  */
 516 void cmd_sexp(char *argbuf)
 517 {
 518         int message_sent = 0;
 519         char x_user[256];
 520         char x_msg[256];
 521         char *lun;              /* <bc> */
 522         char *x_big_msgbuf = NULL;
 523
 524         if ((!(CC->logged_in)) && (!(CC->internal_pgm))) {
 525                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 526                 return;
 527         }
 528         if (CC->fake_username[0])
 529                 lun = CC->fake_username;
 530         else
 531                 lun = CC->usersupp.fullname;
 532
 533         extract(x_user, argbuf, 0);
 534
 535         extract(x_msg, argbuf, 1);
 536
 537         if (!x_user[0]) {
 538                 cprintf("%d You were not previously paged.\n", ERROR);
 539                 return;
 540         }
 541         if ((!strcasecmp(x_user, "broadcast")) && (CC->usersupp.axlevel < 6)) {
 542                 cprintf("%d Higher access required to send a broadcast.\n",
 543                         ERROR + HIGHER_ACCESS_REQUIRED);
 544                 return;
 545         }
 546         /* This loop handles text-transfer pages */
 547         if (!strcmp(x_msg, "-")) {
 548                 message_sent = send_express_message(lun, x_user, "");
 549                 if (message_sent == 0) {
 550                         cprintf("%d No user '%s' logged in.\n", ERROR, x_user);
 551                         return;
 552                 }
 553                 cprintf("%d Transmit message (will deliver to %d users)\n",
 554                         SEND_LISTING, message_sent);
 555                 x_big_msgbuf = mallok(256);
 556                 memset(x_big_msgbuf, 0, 256);
 557                 while (client_gets(x_msg), strcmp(x_msg, "000")) {
 558                         x_big_msgbuf = reallok(x_big_msgbuf,
 559                                strlen(x_big_msgbuf) + strlen(x_msg) + 4);
 560                         if (strlen(x_big_msgbuf) > 0)
 561                            if (x_big_msgbuf[strlen(x_big_msgbuf)] != '\n')
 562                                 strcat(x_big_msgbuf, "\n");
 563                         strcat(x_big_msgbuf, x_msg);
 564                 }
 565                 send_express_message(lun, x_user, x_big_msgbuf);
 566                 phree(x_big_msgbuf);
 567
 568                 /* This loop handles inline pages */
 569         } else {
 570                 message_sent = send_express_message(lun, x_user, x_msg);
 571
 572                 if (message_sent > 0) {
 573                         if (strlen(x_msg) > 0)
 574                                 cprintf("%d Message sent", OK);
 575                         else
 576                                 cprintf("%d Ok to send message", OK);
 577                         if (message_sent > 1)
 578                                 cprintf(" to %d users", message_sent);
 579                         cprintf(".\n");
 580                 } else {
 581                         cprintf("%d No user '%s' logged in.\n", ERROR, x_user);
 582                 }
 583
 584
 585         }
 586 }