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