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