citadel/modules/chat/serv_chat.c

   1 /*
   2  * $Id$
   3  *
   4  * This module handles all "real time" communication between users.  The
   5  * modes of communication currently supported are Chat and Paging.
   6  *
   7  */
   8 #include "sysdep.h"
   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
  18 #if TIME_WITH_SYS_TIME
  19 # include <sys/time.h>
  20 # include <time.h>
  21 #else
  22 # if HAVE_SYS_TIME_H
  23 #  include <sys/time.h>
  24 # else
  25 #  include <time.h>
  26 # endif
  27 #endif
  28
  29 #include <sys/wait.h>
  30 #include <string.h>
  31 #include <limits.h>
  32 #include <libcitadel.h>
  33 #include "citadel.h"
  34 #include "server.h"
  35 #include "serv_chat.h"
  36 #include "citserver.h"
  37 #include "support.h"
  38 #include "config.h"
  39 #include "msgbase.h"
  40 #include "user_ops.h"
  41 #include "room_ops.h"
  42
  43 #ifndef HAVE_SNPRINTF
  44 #include "snprintf.h"
  45 #endif
  46
  47 #include "ctdl_module.h"
  48
  49 struct ChatLine *ChatQueue = NULL;
  50 int ChatLastMsg = 0;
  51
  52 struct imlog {
  53         struct imlog *next;
  54         long usernums[2];
  55         time_t lastmsg;
  56         StrBuf *conversation;
  57 };
  58
  59 struct imlog *imlist = NULL;
  60
  61 /*
  62  * This function handles the logging of instant messages to disk.
  63  */
  64 void log_instant_message(struct CitContext *me, struct CitContext *them, char *msgtext)
  65 {
  66         long usernums[2];
  67         long t;
  68         struct imlog *iptr = NULL;
  69         struct imlog *this_im = NULL;
  70
  71         memset(usernums, 0, sizeof usernums);
  72         usernums[0] = me->user.usernum;
  73         usernums[1] = them->user.usernum;
  74
  75         /* Always put the lower user number first, so we can use the array as a hash value which
  76          * represents a pair of users.  For a broadcast message one of the users will be 0.
  77          */
  78         if (usernums[0] > usernums[1]) {
  79                 t = usernums[0];
  80                 usernums[0] = usernums[1];
  81                 usernums[1] = t;
  82         }
  83
  84         begin_critical_section(S_IM_LOGS);
  85
  86         /* Look for an existing conversation in the hash table.
  87          * If not found, create a new one.
  88          */
  89
  90         this_im = NULL;
  91         for (iptr = imlist; iptr != NULL; iptr = iptr->next) {
  92                 if ((iptr->usernums[0] == usernums[0]) && (iptr->usernums[1] == usernums[1])) {
  93                         /* Existing conversation */
  94                         this_im = iptr;
  95                 }
  96         }
  97         if (this_im == NULL) {
  98                 /* New conversation */
  99                 this_im = malloc(sizeof(struct imlog));
 100                 memset(this_im, 0, sizeof (struct imlog));
 101                 this_im->usernums[0] = usernums[0];
 102                 this_im->usernums[1] = usernums[1];
 103                 this_im->conversation = NewStrBuf();
 104                 this_im->next = imlist;
 105                 imlist = this_im;
 106         }
 107
 108         this_im->lastmsg = time(NULL);          /* Touch the timestamp so we know when to flush */
 109         StrBufAppendPrintf(this_im->conversation, "%s: %s", me->user.fullname, msgtext);
 110         end_critical_section(S_IM_LOGS);
 111 }
 112
 113
 114 /*
 115  * This message can be set to anything you want, but it is
 116  * checked for consistency so don't move it away from here.
 117  */
 118 #define KICKEDMSG "You have been kicked out of this room."
 119
 120 void allwrite(char *cmdbuf, int flag, char *username)
 121 {
 122         FILE *fp;
 123         char bcast[SIZ];
 124         char *un;
 125         struct ChatLine *clptr, *clnew;
 126         time_t now;
 127
 128         if (CC->fake_username[0])
 129                 un = CC->fake_username;
 130         else
 131                 un = CC->user.fullname;
 132         if (flag == 1) {
 133                 snprintf(bcast, sizeof bcast, ":|<%s %s>", un, cmdbuf);
 134         } else if (flag == 0) {
 135                 snprintf(bcast, sizeof bcast, "%s|%s", un, cmdbuf);
 136         } else if (flag == 2) {
 137                 snprintf(bcast, sizeof bcast, ":|<%s whispers %s>", un, cmdbuf);
 138         } else if (flag == 3) {
 139                 snprintf(bcast, sizeof bcast, ":|%s", KICKEDMSG);
 140         }
 141         if ((strcasecmp(cmdbuf, "NOOP")) && (flag != 2)) {
 142                 fp = fopen(CHATLOG, "a");
 143                 if (fp != NULL)
 144                         fprintf(fp, "%s\n", bcast);
 145                 fclose(fp);
 146         }
 147         clnew = (struct ChatLine *) malloc(sizeof(struct ChatLine));
 148         memset(clnew, 0, sizeof(struct ChatLine));
 149         if (clnew == NULL) {
 150                 fprintf(stderr, "citserver: cannot alloc chat line: %s\n",
 151                         strerror(errno));
 152                 return;
 153         }
 154         time(&now);
 155         clnew->next = NULL;
 156         clnew->chat_time = now;
 157         safestrncpy(clnew->chat_room, CC->room.QRname,
 158                         sizeof clnew->chat_room);
 159         clnew->chat_room[sizeof clnew->chat_room - 1] = 0;
 160         if (username) {
 161                 safestrncpy(clnew->chat_username, username,
 162                         sizeof clnew->chat_username);
 163                 clnew->chat_username[sizeof clnew->chat_username - 1] = 0;
 164         } else
 165                 clnew->chat_username[0] = '\0';
 166         safestrncpy(clnew->chat_text, bcast, sizeof clnew->chat_text);
 167
 168         /* Here's the critical section.
 169          * First, add the new message to the queue...
 170          */
 171         begin_critical_section(S_CHATQUEUE);
 172         ++ChatLastMsg;
 173         clnew->chat_seq = ChatLastMsg;
 174         if (ChatQueue == NULL) {
 175                 ChatQueue = clnew;
 176         } else {
 177                 for (clptr = ChatQueue; clptr->next != NULL; clptr = clptr->next);;
 178                 clptr->next = clnew;
 179         }
 180
 181         /* Then, before releasing the lock, free the expired messages */
 182         while ((ChatQueue != NULL) && (now - ChatQueue->chat_time >= 120L)) {
 183                 clptr = ChatQueue;
 184                 ChatQueue = ChatQueue->next;
 185                 free(clptr);
 186         }
 187         end_critical_section(S_CHATQUEUE);
 188 }
 189
 190
 191 t_context *find_context(char **unstr)
 192 {
 193         t_context *t_cc, *found_cc = NULL;
 194         char *name, *tptr;
 195
 196         if ((!*unstr) || (!unstr))
 197                 return (NULL);
 198
 199         begin_critical_section(S_SESSION_TABLE);
 200         for (t_cc = ContextList; ((t_cc) && (!found_cc)); t_cc = t_cc->next) {
 201                 if (t_cc->fake_username[0])
 202                         name = t_cc->fake_username;
 203                 else
 204                         name = t_cc->curr_user;
 205                 tptr = *unstr;
 206                 if ((!strncasecmp(name, tptr, strlen(name))) && (tptr[strlen(name)] == ' ')) {
 207                         found_cc = t_cc;
 208                         *unstr = &(tptr[strlen(name) + 1]);
 209                 }
 210         }
 211         end_critical_section(S_SESSION_TABLE);
 212
 213         return (found_cc);
 214 }
 215
 216 /*
 217  * List users in chat.
 218  * allflag ==   0 = list users in chat
 219  *              1 = list users in chat, followed by users not in chat
 220  *              2 = display count only
 221  */
 222
 223 void do_chat_listing(int allflag)
 224 {
 225         struct CitContext *ccptr;
 226         int count = 0;
 227         int count_elsewhere = 0;
 228         char roomname[ROOMNAMELEN];
 229
 230         if ((allflag == 0) || (allflag == 1))
 231                 cprintf(":|\n:| Users currently in chat:\n");
 232         begin_critical_section(S_SESSION_TABLE);
 233         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 234                 if (ccptr->cs_flags & CS_CHAT) {
 235                         if (!strcasecmp(ccptr->room.QRname,
 236                            CC->room.QRname)) {
 237                                 ++count;
 238                         }
 239                         else {
 240                                 ++count_elsewhere;
 241                         }
 242                 }
 243
 244                 GenerateRoomDisplay(roomname, ccptr, CC);
 245                 if ((CC->user.axlevel < 6)
 246                    && (!IsEmptyStr(ccptr->fake_roomname))) {
 247                         strcpy(roomname, ccptr->fake_roomname);
 248                 }
 249
 250                 if ((ccptr->cs_flags & CS_CHAT)
 251                     && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 252                         if ((allflag == 0) || (allflag == 1)) {
 253                                 cprintf(":| %-25s <%s>:\n",
 254                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 255                                         roomname);
 256                         }
 257                 }
 258         }
 259
 260         if (allflag == 1) {
 261                 cprintf(":|\n:| Users not in chat:\n");
 262                 for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 263
 264                         GenerateRoomDisplay(roomname, ccptr, CC);
 265                         if ((CC->user.axlevel < 6)
 266                         && (!IsEmptyStr(ccptr->fake_roomname))) {
 267                                 strcpy(roomname, ccptr->fake_roomname);
 268                         }
 269
 270                         if (((ccptr->cs_flags & CS_CHAT) == 0)
 271                             && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 272                                 cprintf(":| %-25s <%s>:\n",
 273                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 274                                         roomname);
 275                         }
 276                 }
 277         }
 278         end_critical_section(S_SESSION_TABLE);
 279
 280         if (allflag == 2) {
 281                 if (count > 1) {
 282                         cprintf(":|There are %d users here.\n", count);
 283                 }
 284                 else {
 285                         cprintf(":|Note: you are the only one here.\n");
 286                 }
 287                 if (count_elsewhere > 0) {
 288                         cprintf(":|There are %d users chatting in other rooms.\n", count_elsewhere);
 289                 }
 290         }
 291
 292         cprintf(":|\n");
 293 }
 294
 295
 296 void cmd_chat(char *argbuf)
 297 {
 298         char cmdbuf[SIZ];
 299         char *un;
 300         char *strptr1;
 301         int MyLastMsg, ThisLastMsg;
 302         struct ChatLine *clptr;
 303         struct CitContext *t_context;
 304         int retval;
 305
 306         if (!(CC->logged_in)) {
 307                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 308                 return;
 309         }
 310
 311         CC->cs_flags = CC->cs_flags | CS_CHAT;
 312         cprintf("%d Entering chat mode (type '/help' for available commands)\n",
 313                 START_CHAT_MODE);
 314         unbuffer_output();
 315
 316         MyLastMsg = ChatLastMsg;
 317
 318         if ((CC->cs_flags & CS_STEALTH) == 0) {
 319                 allwrite("<entering chat>", 0, NULL);
 320         }
 321         strcpy(cmdbuf, "");
 322
 323         do_chat_listing(2);
 324
 325         while (1) {
 326                 int ok_cmd;
 327                 int linelen;
 328
 329                 ok_cmd = 0;
 330                 linelen = strlen(cmdbuf);
 331                 if (linelen > 100) --linelen;   /* truncate too-long lines */
 332                 cmdbuf[linelen + 1] = 0;
 333
 334                 retval = client_read_to(&cmdbuf[linelen], 1, 2);
 335
 336                 if (retval < 0 || CC->kill_me) {        /* socket broken? */
 337                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 338                                 allwrite("<disconnected>", 0, NULL);
 339                         }
 340                         return;
 341                 }
 342
 343                 /* if we have a complete line, do send processing */
 344                 if (!IsEmptyStr(cmdbuf))
 345                         if (cmdbuf[strlen(cmdbuf) - 1] == 10) {
 346                                 cmdbuf[strlen(cmdbuf) - 1] = 0;
 347                                 time(&CC->lastcmd);
 348                                 time(&CC->lastidle);
 349
 350                                 if ((!strcasecmp(cmdbuf, "exit"))
 351                                     || (!strcasecmp(cmdbuf, "/exit"))
 352                                     || (!strcasecmp(cmdbuf, "quit"))
 353                                     || (!strcasecmp(cmdbuf, "logout"))
 354                                     || (!strcasecmp(cmdbuf, "logoff"))
 355                                     || (!strcasecmp(cmdbuf, "/q"))
 356                                     || (!strcasecmp(cmdbuf, ".q"))
 357                                     || (!strcasecmp(cmdbuf, "/quit"))
 358                                     )
 359                                         strcpy(cmdbuf, "000");
 360
 361                                 if (!strcmp(cmdbuf, "000")) {
 362                                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 363                                                 allwrite("<exiting chat>", 0, NULL);
 364                                         }
 365                                         sleep(1);
 366                                         cprintf("000\n");
 367                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 368                                         return;
 369                                 }
 370                                 if ((!strcasecmp(cmdbuf, "/help"))
 371                                     || (!strcasecmp(cmdbuf, "help"))
 372                                     || (!strcasecmp(cmdbuf, "/?"))
 373                                     || (!strcasecmp(cmdbuf, "?"))) {
 374                                         cprintf(":|\n");
 375                                         cprintf(":|Available commands: \n");
 376                                         cprintf(":|/help   (prints this message) \n");
 377                                         cprintf(":|/who    (list users currently in chat) \n");
 378                                         cprintf(":|/whobbs (list users in chat -and- elsewhere) \n");
 379                                         cprintf(":|/me     ('action' line, ala irc) \n");
 380                                         cprintf(":|/msg    (send private message, ala irc) \n");
 381                                         if (is_room_aide()) {
 382                                                 cprintf(":|/kick   (kick another user out of this room) \n");
 383                                         }
 384                                         cprintf(":|/quit   (exit from this chat) \n");
 385                                         cprintf(":|\n");
 386                                         ok_cmd = 1;
 387                                 }
 388                                 if (!strcasecmp(cmdbuf, "/who")) {
 389                                         do_chat_listing(0);
 390                                         ok_cmd = 1;
 391                                 }
 392                                 if (!strcasecmp(cmdbuf, "/whobbs")) {
 393                                         do_chat_listing(1);
 394                                         ok_cmd = 1;
 395                                 }
 396                                 if (!strncasecmp(cmdbuf, "/me ", 4)) {
 397                                         allwrite(&cmdbuf[4], 1, NULL);
 398                                         ok_cmd = 1;
 399                                 }
 400                                 if (!strncasecmp(cmdbuf, "/msg ", 5)) {
 401                                         ok_cmd = 1;
 402                                         strptr1 = &cmdbuf[5];
 403                                         if ((t_context = find_context(&strptr1))) {
 404                                                 allwrite(strptr1, 2, CC->curr_user);
 405                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 406                                                         allwrite(strptr1, 2, t_context->curr_user);
 407                                         } else
 408                                                 cprintf(":|User not found.\n");
 409                                         cprintf("\n");
 410                                 }
 411                                 /* The /kick function is implemented by sending a specific
 412                                  * message to the kicked-out user's context.  When that message
 413                                  * is processed by the read loop, that context will exit.
 414                                  */
 415                                 if ( (!strncasecmp(cmdbuf, "/kick ", 6)) && (is_room_aide()) ) {
 416                                         ok_cmd = 1;
 417                                         strptr1 = &cmdbuf[6];
 418                                         strcat(strptr1, " ");
 419                                         if ((t_context = find_context(&strptr1))) {
 420                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 421                                                         allwrite(strptr1, 3, t_context->curr_user);
 422                                         } else
 423                                                 cprintf(":|User not found.\n");
 424                                         cprintf("\n");
 425                                 }
 426                                 if ((cmdbuf[0] != '/') && (strlen(cmdbuf) > 0)) {
 427                                         ok_cmd = 1;
 428                                         allwrite(cmdbuf, 0, NULL);
 429                                 }
 430                                 if ((!ok_cmd) && (cmdbuf[0]) && (cmdbuf[0] != '\n'))
 431                                         cprintf(":|Command %s is not understood.\n", cmdbuf);
 432
 433                                 strcpy(cmdbuf, "");
 434
 435                         }
 436                 /* now check the queue for new incoming stuff */
 437
 438                 if (CC->fake_username[0])
 439                         un = CC->fake_username;
 440                 else
 441                         un = CC->curr_user;
 442                 if (ChatLastMsg > MyLastMsg) {
 443                         ThisLastMsg = ChatLastMsg;
 444                         for (clptr = ChatQueue; clptr != NULL; clptr = clptr->next) {
 445                                 if ((clptr->chat_seq > MyLastMsg) && ((!clptr->chat_username[0]) || (!strncasecmp(un, clptr->chat_username, 32)))) {
 446                                         if ((!clptr->chat_room[0]) || (!strncasecmp(CC->room.QRname, clptr->chat_room, ROOMNAMELEN))) {
 447                                                 /* Output new chat data */
 448                                                 cprintf("%s\n", clptr->chat_text);
 449
 450                                                 /* See if we've been force-quitted (kicked etc.) */
 451                                                 if (!strcmp(&clptr->chat_text[2], KICKEDMSG)) {
 452                                                         allwrite("<kicked out of this room>", 0, NULL);
 453                                                         cprintf("000\n");
 454                                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 455
 456                                                         /* Kick user out of room */
 457                                                         CtdlInvtKick(CC->user.fullname, 0);
 458
 459                                                         /* And return to the Lobby */
 460                                                         usergoto(config.c_baseroom, 0, 0, NULL, NULL);
 461                                                         return;
 462                                                 }
 463                                         }
 464                                 }
 465                         }
 466                         MyLastMsg = ThisLastMsg;
 467                 }
 468         }
 469 }
 470
 471
 472
 473 /*
 474  * Delete any remaining instant messages
 475  */
 476 void delete_instant_messages(void) {
 477         struct ExpressMessage *ptr;
 478
 479         begin_critical_section(S_SESSION_TABLE);
 480         while (CC->FirstExpressMessage != NULL) {
 481                 ptr = CC->FirstExpressMessage->next;
 482                 if (CC->FirstExpressMessage->text != NULL)
 483                         free(CC->FirstExpressMessage->text);
 484                 free(CC->FirstExpressMessage);
 485                 CC->FirstExpressMessage = ptr;
 486         }
 487         end_critical_section(S_SESSION_TABLE);
 488 }
 489
 490
 491
 492
 493 /*
 494  * Poll for instant messages (OLD METHOD -- ***DEPRECATED ***)
 495  */
 496 void cmd_pexp(char *argbuf)
 497 {
 498         struct ExpressMessage *ptr, *holdptr;
 499
 500         if (CC->FirstExpressMessage == NULL) {
 501                 cprintf("%d No instant messages waiting.\n", ERROR + MESSAGE_NOT_FOUND);
 502                 return;
 503         }
 504         begin_critical_section(S_SESSION_TABLE);
 505         ptr = CC->FirstExpressMessage;
 506         CC->FirstExpressMessage = NULL;
 507         end_critical_section(S_SESSION_TABLE);
 508
 509         cprintf("%d Express msgs:\n", LISTING_FOLLOWS);
 510         while (ptr != NULL) {
 511                 if (ptr->flags && EM_BROADCAST)
 512                         cprintf("Broadcast message ");
 513                 else if (ptr->flags && EM_CHAT)
 514                         cprintf("Chat request ");
 515                 else if (ptr->flags && EM_GO_AWAY)
 516                         cprintf("Please logoff now, as requested ");
 517                 else
 518                         cprintf("Message ");
 519                 cprintf("from %s:\n", ptr->sender);
 520                 if (ptr->text != NULL)
 521                         memfmout(ptr->text, 0, "\n");
 522
 523                 holdptr = ptr->next;
 524                 if (ptr->text != NULL) free(ptr->text);
 525                 free(ptr);
 526                 ptr = holdptr;
 527         }
 528         cprintf("000\n");
 529 }
 530
 531
 532 /*
 533  * Get instant messages (new method)
 534  */
 535 void cmd_gexp(char *argbuf) {
 536         struct ExpressMessage *ptr;
 537
 538         if (CC->FirstExpressMessage == NULL) {
 539                 cprintf("%d No instant messages waiting.\n", ERROR + MESSAGE_NOT_FOUND);
 540                 return;
 541         }
 542
 543         begin_critical_section(S_SESSION_TABLE);
 544         ptr = CC->FirstExpressMessage;
 545         CC->FirstExpressMessage = CC->FirstExpressMessage->next;
 546         end_critical_section(S_SESSION_TABLE);
 547
 548         cprintf("%d %d|%ld|%d|%s|%s|%s\n",
 549                 LISTING_FOLLOWS,
 550                 ((ptr->next != NULL) ? 1 : 0),          /* more msgs? */
 551                 (long)ptr->timestamp,                   /* time sent */
 552                 ptr->flags,                             /* flags */
 553                 ptr->sender,                            /* sender of msg */
 554                 config.c_nodename,                      /* static for now (and possibly deprecated) */
 555                 ptr->sender_email                       /* email or jid of sender */
 556         );
 557
 558         if (ptr->text != NULL) {
 559                 memfmout(ptr->text, 0, "\n");
 560                 if (ptr->text[strlen(ptr->text)-1] != '\n') cprintf("\n");
 561                 free(ptr->text);
 562         }
 563
 564         cprintf("000\n");
 565         free(ptr);
 566 }
 567
 568 /*
 569  * Asynchronously deliver instant messages
 570  */
 571 void cmd_gexp_async(void) {
 572
 573         /* Only do this if the session can handle asynchronous protocol */
 574         if (CC->is_async == 0) return;
 575
 576         /* And don't do it if there's nothing to send. */
 577         if (CC->FirstExpressMessage == NULL) return;
 578
 579         cprintf("%d instant msg\n", ASYNC_MSG + ASYNC_GEXP);
 580 }
 581
 582 /*
 583  * Back end support function for send_instant_message() and company
 584  */
 585 void add_xmsg_to_context(struct CitContext *ccptr, struct ExpressMessage *newmsg)
 586 {
 587         struct ExpressMessage *findend;
 588
 589         if (ccptr->FirstExpressMessage == NULL) {
 590                 ccptr->FirstExpressMessage = newmsg;
 591         }
 592         else {
 593                 findend = ccptr->FirstExpressMessage;
 594                 while (findend->next != NULL) {
 595                         findend = findend->next;
 596                 }
 597                 findend->next = newmsg;
 598         }
 599
 600         /* If the target context is a session which can handle asynchronous
 601          * messages, go ahead and set the flag for that.
 602          */
 603         if (ccptr->is_async) {
 604                 ccptr->async_waiting = 1;
 605                 if (ccptr->state == CON_IDLE) {
 606                         ccptr->state = CON_READY;
 607                 }
 608         }
 609 }
 610
 611
 612
 613
 614 /*
 615  * This is the back end to the instant message sending function.
 616  * Returns the number of users to which the message was sent.
 617  * Sending a zero-length message tests for recipients without sending messages.
 618  */
 619 int send_instant_message(char *lun, char *lem, char *x_user, char *x_msg)
 620 {
 621         int message_sent = 0;           /* number of successful sends */
 622         struct CitContext *ccptr;
 623         struct ExpressMessage *newmsg = NULL;
 624         char *un;
 625         size_t msglen = 0;
 626         int do_send = 0;                /* 1 = send message; 0 = only check for valid recipient */
 627
 628         if (strlen(x_msg) > 0) {
 629                 msglen = strlen(x_msg) + 4;
 630                 do_send = 1;
 631         }
 632
 633         /* find the target user's context and append the message */
 634         begin_critical_section(S_SESSION_TABLE);
 635         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 636
 637                 if (ccptr->fake_username[0]) {
 638                         un = ccptr->fake_username;
 639                 }
 640                 else {
 641                         un = ccptr->user.fullname;
 642                 }
 643
 644                 if ( ((!strcasecmp(un, x_user))
 645                     || (!strcasecmp(x_user, "broadcast")))
 646                     && (ccptr->can_receive_im)
 647                     && ((ccptr->disable_exp == 0)
 648                     || (CC->user.axlevel >= 6)) ) {
 649                         if (do_send) {
 650                                 newmsg = (struct ExpressMessage *)
 651                                         malloc(sizeof (struct ExpressMessage));
 652                                 memset(newmsg, 0,
 653                                         sizeof (struct ExpressMessage));
 654                                 time(&(newmsg->timestamp));
 655                                 safestrncpy(newmsg->sender, lun, sizeof newmsg->sender);
 656                                 safestrncpy(newmsg->sender_email, lem, sizeof newmsg->sender_email);
 657                                 if (!strcasecmp(x_user, "broadcast")) {
 658                                         newmsg->flags |= EM_BROADCAST;
 659                                 }
 660                                 newmsg->text = strdup(x_msg);
 661
 662                                 add_xmsg_to_context(ccptr, newmsg);
 663
 664                                 /* and log it ... */
 665                                 if (ccptr != CC) {
 666                                         log_instant_message(CC, ccptr, newmsg->text);
 667                                 }
 668                         }
 669                         ++message_sent;
 670                 }
 671         }
 672         end_critical_section(S_SESSION_TABLE);
 673         return (message_sent);
 674 }
 675
 676 /*
 677  * send instant messages
 678  */
 679 void cmd_sexp(char *argbuf)
 680 {
 681         int message_sent = 0;
 682         char x_user[USERNAME_SIZE];
 683         char x_msg[1024];
 684         char *lun;
 685         char *lem;
 686         char *x_big_msgbuf = NULL;
 687
 688         if ((!(CC->logged_in)) && (!(CC->internal_pgm))) {
 689                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 690                 return;
 691         }
 692         if (CC->fake_username[0])
 693                 lun = CC->fake_username;
 694         else
 695                 lun = CC->user.fullname;
 696
 697         lem = CC->cs_inet_email;
 698
 699         extract_token(x_user, argbuf, 0, '|', sizeof x_user);
 700         extract_token(x_msg, argbuf, 1, '|', sizeof x_msg);
 701
 702         if (!x_user[0]) {
 703                 cprintf("%d You were not previously paged.\n", ERROR + NO_SUCH_USER);
 704                 return;
 705         }
 706         if ((!strcasecmp(x_user, "broadcast")) && (CC->user.axlevel < 6)) {
 707                 cprintf("%d Higher access required to send a broadcast.\n",
 708                         ERROR + HIGHER_ACCESS_REQUIRED);
 709                 return;
 710         }
 711         /* This loop handles text-transfer pages */
 712         if (!strcmp(x_msg, "-")) {
 713                 message_sent = PerformXmsgHooks(lun, lem, x_user, "");
 714                 if (message_sent == 0) {
 715                         if (getuser(NULL, x_user))
 716                                 cprintf("%d '%s' does not exist.\n",
 717                                                 ERROR + NO_SUCH_USER, x_user);
 718                         else
 719                                 cprintf("%d '%s' is not logged in "
 720                                                 "or is not accepting pages.\n",
 721                                                 ERROR + RESOURCE_NOT_OPEN, x_user);
 722                         return;
 723                 }
 724                 unbuffer_output();
 725                 cprintf("%d Transmit message (will deliver to %d users)\n",
 726                         SEND_LISTING, message_sent);
 727                 x_big_msgbuf = malloc(SIZ);
 728                 memset(x_big_msgbuf, 0, SIZ);
 729                 while (client_getln(x_msg, sizeof x_msg) >= 0 && strcmp(x_msg, "000")) {
 730                         x_big_msgbuf = realloc(x_big_msgbuf,
 731                                strlen(x_big_msgbuf) + strlen(x_msg) + 4);
 732                         if (!IsEmptyStr(x_big_msgbuf))
 733                            if (x_big_msgbuf[strlen(x_big_msgbuf)] != '\n')
 734                                 strcat(x_big_msgbuf, "\n");
 735                         strcat(x_big_msgbuf, x_msg);
 736                 }
 737                 PerformXmsgHooks(lun, lem, x_user, x_big_msgbuf);
 738                 free(x_big_msgbuf);
 739
 740                 /* This loop handles inline pages */
 741         } else {
 742                 message_sent = PerformXmsgHooks(lun, lem, x_user, x_msg);
 743
 744                 if (message_sent > 0) {
 745                         if (!IsEmptyStr(x_msg))
 746                                 cprintf("%d Message sent", CIT_OK);
 747                         else
 748                                 cprintf("%d Ok to send message", CIT_OK);
 749                         if (message_sent > 1)
 750                                 cprintf(" to %d users", message_sent);
 751                         cprintf(".\n");
 752                 } else {
 753                         if (getuser(NULL, x_user))
 754                                 cprintf("%d '%s' does not exist.\n",
 755                                                 ERROR + NO_SUCH_USER, x_user);
 756                         else
 757                                 cprintf("%d '%s' is not logged in "
 758                                                 "or is not accepting pages.\n",
 759                                                 ERROR + RESOURCE_NOT_OPEN, x_user);
 760                 }
 761
 762
 763         }
 764 }
 765
 766
 767
 768 /*
 769  * Enter or exit paging-disabled mode
 770  */
 771 void cmd_dexp(char *argbuf)
 772 {
 773         int new_state;
 774
 775         if (CtdlAccessCheck(ac_logged_in)) return;
 776
 777         new_state = extract_int(argbuf, 0);
 778         if ((new_state == 0) || (new_state == 1)) {
 779                 CC->disable_exp = new_state;
 780         }
 781
 782         cprintf("%d %d\n", CIT_OK, CC->disable_exp);
 783 }
 784
 785
 786 /*
 787  * Request client termination
 788  */
 789 void cmd_reqt(char *argbuf) {
 790         struct CitContext *ccptr;
 791         int sessions = 0;
 792         int which_session;
 793         struct ExpressMessage *newmsg;
 794
 795         if (CtdlAccessCheck(ac_aide)) return;
 796         which_session = extract_int(argbuf, 0);
 797
 798         begin_critical_section(S_SESSION_TABLE);
 799         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 800                 if ((ccptr->cs_pid == which_session) || (which_session == 0)) {
 801
 802                         newmsg = (struct ExpressMessage *)
 803                                 malloc(sizeof (struct ExpressMessage));
 804                         memset(newmsg, 0,
 805                                 sizeof (struct ExpressMessage));
 806                         time(&(newmsg->timestamp));
 807                         safestrncpy(newmsg->sender, CC->user.fullname,
 808                                     sizeof newmsg->sender);
 809                         newmsg->flags |= EM_GO_AWAY;
 810                         newmsg->text = strdup("Automatic logoff requested.");
 811
 812                         add_xmsg_to_context(ccptr, newmsg);
 813                         ++sessions;
 814
 815                 }
 816         }
 817         end_critical_section(S_SESSION_TABLE);
 818         cprintf("%d Sent termination request to %d sessions.\n", CIT_OK, sessions);
 819 }
 820
 821
 822 /*
 823  * This is the back end for flush_conversations_to_disk()
 824  * At this point we've isolated a single conversation (struct imlog)
 825  * and are ready to write it to disk.
 826  */
 827 void flush_individual_conversation(struct imlog *im) {
 828         struct CtdlMessage *msg;
 829         long msgnum = 0;
 830         char roomname[ROOMNAMELEN];
 831
 832         msg = malloc(sizeof(struct CtdlMessage));
 833         memset(msg, 0, sizeof(struct CtdlMessage));
 834         msg->cm_magic = CTDLMESSAGE_MAGIC;
 835         msg->cm_anon_type = MES_NORMAL;
 836         msg->cm_format_type = FMT_CITADEL;
 837         msg->cm_fields['A'] = strdup("Citadel");
 838         msg->cm_fields['O'] = strdup(PAGELOGROOM);
 839         msg->cm_fields['N'] = strdup(NODENAME);
 840         msg->cm_fields['M'] = strdup(ChrPtr(im->conversation));
 841
 842         /* Start with usernums[1] because it's guaranteed to be higher than usernums[0],
 843          * so if there's only one party, usernums[0] will be zero but usernums[1] won't.
 844          * Create the room if necessary.  Note that we create as a type 5 room rather
 845          * than 4, which indicates that it's a personal room but we've already supplied
 846          * the namespace prefix.
 847          *
 848          * In the unlikely event that usernums[1] is zero, a room with an invalid namespace
 849          * prefix will be created.  That's ok because the auto-purger will clean it up later.
 850          */
 851         snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[1], PAGELOGROOM);
 852         create_room(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 853         msgnum = CtdlSubmitMsg(msg, NULL, roomname, 0);
 854         CtdlFreeMessage(msg);
 855
 856         /* If there is a valid user number in usernums[0], save a copy for them too. */
 857         if (im->usernums[0] > 0) {
 858                 snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[0], PAGELOGROOM);
 859                 create_room(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 860                 CtdlSaveMsgPointerInRoom(roomname, msgnum, 0, NULL);
 861         }
 862
 863         /* Finally, if we're logging instant messages globally, do that now. */
 864         if (!IsEmptyStr(config.c_logpages)) {
 865                 create_room(config.c_logpages, 3, "", 0, 1, 1, VIEW_BBS);
 866                 CtdlSaveMsgPointerInRoom(config.c_logpages, msgnum, 0, NULL);
 867         }
 868
 869 }
 870
 871 /*
 872  * Locate instant message conversations which have gone idle
 873  * (or, if the server is shutting down, locate *all* conversations)
 874  * and flush them to disk (in the participants' log rooms, etc.)
 875  */
 876 void flush_conversations_to_disk(time_t if_older_than) {
 877
 878         struct imlog *flush_these = NULL;
 879         struct imlog *dont_flush_these = NULL;
 880         struct imlog *imptr = NULL;
 881
 882         begin_critical_section(S_IM_LOGS);
 883         while (imlist)
 884         {
 885                 imptr = imlist;
 886                 imlist = imlist->next;
 887                 if ((time(NULL) - imptr->lastmsg) > if_older_than)
 888                 {
 889                         /* This conversation qualifies.  Move it to the list of ones to flush. */
 890                         imptr->next = flush_these;
 891                         flush_these = imptr;
 892                 }
 893                 else  {
 894                         /* Move it to the list of ones not to flush. */
 895                         imptr->next = dont_flush_these;
 896                         dont_flush_these = imptr;
 897                 }
 898         }
 899         imlist = dont_flush_these;
 900         end_critical_section(S_IM_LOGS);
 901
 902         /* We are now outside of the critical section, and we are the only thread holding a
 903          * pointer to a linked list of conversations to be flushed to disk.
 904          */
 905         while (flush_these) {
 906
 907                 flush_individual_conversation(flush_these);
 908                 imptr = flush_these;
 909                 flush_these = flush_these->next;
 910                 FreeStrBuf(&imptr->conversation);
 911                 free(imptr);
 912         }
 913 }
 914
 915
 916
 917 void chat_timer(void) {
 918         flush_conversations_to_disk(300);       /* Anything that hasn't peeped in more than 5 minutes */
 919 }
 920
 921 void chat_shutdown(void) {
 922         flush_conversations_to_disk(0);         /* Get it ALL onto disk NOW. */
 923 }
 924
 925 CTDL_MODULE_INIT(chat)
 926 {
 927         if (!threading)
 928         {
 929                 CtdlRegisterProtoHook(cmd_chat, "CHAT", "Begin real-time chat");
 930                 CtdlRegisterProtoHook(cmd_pexp, "PEXP", "Poll for instant messages");
 931                 CtdlRegisterProtoHook(cmd_gexp, "GEXP", "Get instant messages");
 932                 CtdlRegisterProtoHook(cmd_sexp, "SEXP", "Send an instant message");
 933                 CtdlRegisterProtoHook(cmd_dexp, "DEXP", "Disable instant messages");
 934                 CtdlRegisterProtoHook(cmd_reqt, "REQT", "Request client termination");
 935                 CtdlRegisterSessionHook(cmd_gexp_async, EVT_ASYNC);
 936                 CtdlRegisterSessionHook(delete_instant_messages, EVT_STOP);
 937                 CtdlRegisterXmsgHook(send_instant_message, XMSG_PRI_LOCAL);
 938                 CtdlRegisterSessionHook(chat_timer, EVT_TIMER);
 939                 CtdlRegisterSessionHook(chat_shutdown, EVT_SHUTDOWN);
 940         }
 941
 942         /* return our Subversion id for the Log */
 943         return "$Id$";
 944 }
 945