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