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         char usernames[2][128];
  56         time_t lastmsg;
  57         StrBuf *conversation;
  58 };
  59
  60 struct imlog *imlist = NULL;
  61
  62 /*
  63  * This function handles the logging of instant messages to disk.
  64  */
  65 void log_instant_message(struct CitContext *me, struct CitContext *them, char *msgtext)
  66 {
  67         long usernums[2];
  68         long t;
  69         struct imlog *iptr = NULL;
  70         struct imlog *this_im = NULL;
  71
  72         memset(usernums, 0, sizeof usernums);
  73         usernums[0] = me->user.usernum;
  74         usernums[1] = them->user.usernum;
  75
  76         /* Always put the lower user number first, so we can use the array as a hash value which
  77          * represents a pair of users.  For a broadcast message one of the users will be 0.
  78          */
  79         if (usernums[0] > usernums[1]) {
  80                 t = usernums[0];
  81                 usernums[0] = usernums[1];
  82                 usernums[1] = t;
  83         }
  84
  85         begin_critical_section(S_IM_LOGS);
  86
  87         /* Look for an existing conversation in the hash table.
  88          * If not found, create a new one.
  89          */
  90
  91         this_im = NULL;
  92         for (iptr = imlist; iptr != NULL; iptr = iptr->next) {
  93                 if ((iptr->usernums[0] == usernums[0]) && (iptr->usernums[1] == usernums[1])) {
  94                         /* Existing conversation */
  95                         this_im = iptr;
  96                 }
  97         }
  98         if (this_im == NULL) {
  99                 /* New conversation */
 100                 this_im = malloc(sizeof(struct imlog));
 101                 memset(this_im, 0, sizeof (struct imlog));
 102                 this_im->usernums[0] = usernums[0];
 103                 this_im->usernums[1] = usernums[1];
 104                 /* usernames[] and usernums[] might not be in the same order.  This is not an error. */
 105                 if (me) {
 106                         safestrncpy(this_im->usernames[0], me->user.fullname, sizeof this_im->usernames[0]);
 107                 }
 108                 if (them) {
 109                         safestrncpy(this_im->usernames[1], them->user.fullname, sizeof this_im->usernames[1]);
 110                 }
 111                 this_im->conversation = NewStrBuf();
 112                 this_im->next = imlist;
 113                 imlist = this_im;
 114                 StrBufAppendBufPlain(this_im->conversation, HKEY(
 115                         "Content-type: text/html\r\n"
 116                         "Content-transfer-encoding: 7bit\r\n"
 117                         "\r\n"
 118                         "<html><body>\r\n"
 119                         ), 0);
 120         }
 121
 122         this_im->lastmsg = time(NULL);          /* Touch the timestamp so we know when to flush */
 123         StrBufAppendBufPlain(this_im->conversation, HKEY("<p><b>"), 0);
 124         StrBufAppendBufPlain(this_im->conversation, me->user.fullname, -1, 0);
 125         StrBufAppendBufPlain(this_im->conversation, HKEY(":</b> "), 0);
 126         StrEscAppend(this_im->conversation, NULL, msgtext, 0, 0);
 127         StrBufAppendBufPlain(this_im->conversation, HKEY("</p>\r\n"), 0);
 128         end_critical_section(S_IM_LOGS);
 129 }
 130
 131 /*
 132  * This message can be set to anything you want, but it is
 133  * checked for consistency so don't move it away from here.
 134  */
 135 #define KICKEDMSG "You have been kicked out of this room."
 136
 137 void allwrite(char *cmdbuf, int flag, char *username)
 138 {
 139         FILE *fp;
 140         char bcast[SIZ];
 141         char *un;
 142         struct ChatLine *clptr, *clnew;
 143         time_t now;
 144
 145         if (CC->fake_username[0])
 146                 un = CC->fake_username;
 147         else
 148                 un = CC->user.fullname;
 149         if (flag == 1) {
 150                 snprintf(bcast, sizeof bcast, ":|<%s %s>", un, cmdbuf);
 151         } else if (flag == 0) {
 152                 snprintf(bcast, sizeof bcast, "%s|%s", un, cmdbuf);
 153         } else if (flag == 2) {
 154                 snprintf(bcast, sizeof bcast, ":|<%s whispers %s>", un, cmdbuf);
 155         } else if (flag == 3) {
 156                 snprintf(bcast, sizeof bcast, ":|%s", KICKEDMSG);
 157         }
 158         if ((strcasecmp(cmdbuf, "NOOP")) && (flag != 2)) {
 159                 fp = fopen(CHATLOG, "a");
 160                 if (fp != NULL)
 161                         fprintf(fp, "%s\n", bcast);
 162                 fclose(fp);
 163         }
 164         clnew = (struct ChatLine *) malloc(sizeof(struct ChatLine));
 165         memset(clnew, 0, sizeof(struct ChatLine));
 166         if (clnew == NULL) {
 167                 fprintf(stderr, "citserver: cannot alloc chat line: %s\n",
 168                         strerror(errno));
 169                 return;
 170         }
 171         time(&now);
 172         clnew->next = NULL;
 173         clnew->chat_time = now;
 174         safestrncpy(clnew->chat_room, CC->room.QRname,
 175                         sizeof clnew->chat_room);
 176         clnew->chat_room[sizeof clnew->chat_room - 1] = 0;
 177         if (username) {
 178                 safestrncpy(clnew->chat_username, username,
 179                         sizeof clnew->chat_username);
 180                 clnew->chat_username[sizeof clnew->chat_username - 1] = 0;
 181         } else
 182                 clnew->chat_username[0] = '\0';
 183         safestrncpy(clnew->chat_text, bcast, sizeof clnew->chat_text);
 184
 185         /* Here's the critical section.
 186          * First, add the new message to the queue...
 187          */
 188         begin_critical_section(S_CHATQUEUE);
 189         ++ChatLastMsg;
 190         clnew->chat_seq = ChatLastMsg;
 191         if (ChatQueue == NULL) {
 192                 ChatQueue = clnew;
 193         } else {
 194                 for (clptr = ChatQueue; clptr->next != NULL; clptr = clptr->next);;
 195                 clptr->next = clnew;
 196         }
 197
 198         /* Then, before releasing the lock, free the expired messages */
 199         while ((ChatQueue != NULL) && (now - ChatQueue->chat_time >= 120L)) {
 200                 clptr = ChatQueue;
 201                 ChatQueue = ChatQueue->next;
 202                 free(clptr);
 203         }
 204         end_critical_section(S_CHATQUEUE);
 205 }
 206
 207
 208 t_context *find_context(char **unstr)
 209 {
 210         t_context *t_cc, *found_cc = NULL;
 211         char *name, *tptr;
 212
 213         if ((!*unstr) || (!unstr))
 214                 return (NULL);
 215
 216         begin_critical_section(S_SESSION_TABLE);
 217         for (t_cc = ContextList; ((t_cc) && (!found_cc)); t_cc = t_cc->next) {
 218                 if (t_cc->fake_username[0])
 219                         name = t_cc->fake_username;
 220                 else
 221                         name = t_cc->curr_user;
 222                 tptr = *unstr;
 223                 if ((!strncasecmp(name, tptr, strlen(name))) && (tptr[strlen(name)] == ' ')) {
 224                         found_cc = t_cc;
 225                         *unstr = &(tptr[strlen(name) + 1]);
 226                 }
 227         }
 228         end_critical_section(S_SESSION_TABLE);
 229
 230         return (found_cc);
 231 }
 232
 233 /*
 234  * List users in chat.
 235  * allflag ==   0 = list users in chat
 236  *              1 = list users in chat, followed by users not in chat
 237  *              2 = display count only
 238  */
 239
 240 void do_chat_listing(int allflag)
 241 {
 242         struct CitContext *ccptr;
 243         int count = 0;
 244         int count_elsewhere = 0;
 245         char roomname[ROOMNAMELEN];
 246
 247         if ((allflag == 0) || (allflag == 1))
 248                 cprintf(":|\n:| Users currently in chat:\n");
 249         begin_critical_section(S_SESSION_TABLE);
 250         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 251                 if (ccptr->cs_flags & CS_CHAT) {
 252                         if (!strcasecmp(ccptr->room.QRname,
 253                            CC->room.QRname)) {
 254                                 ++count;
 255                         }
 256                         else {
 257                                 ++count_elsewhere;
 258                         }
 259                 }
 260
 261                 GenerateRoomDisplay(roomname, ccptr, CC);
 262                 if ((CC->user.axlevel < 6) && (!IsEmptyStr(ccptr->fake_roomname))) {
 263                         strcpy(roomname, ccptr->fake_roomname);
 264                 }
 265
 266                 if ((ccptr->cs_flags & CS_CHAT) && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 267                         if ((allflag == 0) || (allflag == 1)) {
 268                                 cprintf(":| %-25s <%s>:\n",
 269                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 270                                         roomname);
 271                         }
 272                 }
 273         }
 274
 275         if (allflag == 1) {
 276                 cprintf(":|\n:| Users not in chat:\n");
 277                 for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 278
 279                         GenerateRoomDisplay(roomname, ccptr, CC);
 280                         if ((CC->user.axlevel < 6)
 281                         && (!IsEmptyStr(ccptr->fake_roomname))) {
 282                                 strcpy(roomname, ccptr->fake_roomname);
 283                         }
 284
 285                         if (((ccptr->cs_flags & CS_CHAT) == 0)
 286                             && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 287                                 cprintf(":| %-25s <%s>:\n",
 288                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 289                                         roomname);
 290                         }
 291                 }
 292         }
 293         end_critical_section(S_SESSION_TABLE);
 294
 295         if (allflag == 2) {
 296                 if (count > 1) {
 297                         cprintf(":|There are %d users here.\n", count);
 298                 }
 299                 else {
 300                         cprintf(":|Note: you are the only one here.\n");
 301                 }
 302                 if (count_elsewhere > 0) {
 303                         cprintf(":|There are %d users chatting in other rooms.\n", count_elsewhere);
 304                 }
 305         }
 306
 307         cprintf(":|\n");
 308 }
 309
 310
 311 void cmd_chat(char *argbuf)
 312 {
 313         char cmdbuf[SIZ];
 314         char *un;
 315         char *strptr1;
 316         int MyLastMsg, ThisLastMsg;
 317         struct ChatLine *clptr;
 318         struct CitContext *t_context;
 319         int retval;
 320
 321         if (!(CC->logged_in)) {
 322                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 323                 return;
 324         }
 325
 326         CC->cs_flags = CC->cs_flags | CS_CHAT;
 327         cprintf("%d Entering chat mode (type '/help' for available commands)\n",
 328                 START_CHAT_MODE);
 329         unbuffer_output();
 330
 331         MyLastMsg = ChatLastMsg;
 332
 333         if ((CC->cs_flags & CS_STEALTH) == 0) {
 334                 allwrite("<entering chat>", 0, NULL);
 335         }
 336         strcpy(cmdbuf, "");
 337
 338         do_chat_listing(2);
 339
 340         while (1) {
 341                 int ok_cmd;
 342                 int linelen;
 343
 344                 ok_cmd = 0;
 345                 linelen = strlen(cmdbuf);
 346                 if (linelen > 100) --linelen;   /* truncate too-long lines */
 347                 cmdbuf[linelen + 1] = 0;
 348
 349                 retval = client_read_to(&cmdbuf[linelen], 1, 2);
 350
 351                 if (retval < 0 || CC->kill_me) {        /* socket broken? */
 352                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 353                                 allwrite("<disconnected>", 0, NULL);
 354                         }
 355                         return;
 356                 }
 357
 358                 /* if we have a complete line, do send processing */
 359                 if (!IsEmptyStr(cmdbuf))
 360                         if (cmdbuf[strlen(cmdbuf) - 1] == 10) {
 361                                 cmdbuf[strlen(cmdbuf) - 1] = 0;
 362                                 time(&CC->lastcmd);
 363                                 time(&CC->lastidle);
 364
 365                                 if ((!strcasecmp(cmdbuf, "exit"))
 366                                     || (!strcasecmp(cmdbuf, "/exit"))
 367                                     || (!strcasecmp(cmdbuf, "quit"))
 368                                     || (!strcasecmp(cmdbuf, "logout"))
 369                                     || (!strcasecmp(cmdbuf, "logoff"))
 370                                     || (!strcasecmp(cmdbuf, "/q"))
 371                                     || (!strcasecmp(cmdbuf, ".q"))
 372                                     || (!strcasecmp(cmdbuf, "/quit"))
 373                                     )
 374                                         strcpy(cmdbuf, "000");
 375
 376                                 if (!strcmp(cmdbuf, "000")) {
 377                                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 378                                                 allwrite("<exiting chat>", 0, NULL);
 379                                         }
 380                                         sleep(1);
 381                                         cprintf("000\n");
 382                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 383                                         return;
 384                                 }
 385                                 if ((!strcasecmp(cmdbuf, "/help"))
 386                                     || (!strcasecmp(cmdbuf, "help"))
 387                                     || (!strcasecmp(cmdbuf, "/?"))
 388                                     || (!strcasecmp(cmdbuf, "?"))) {
 389                                         cprintf(":|\n");
 390                                         cprintf(":|Available commands: \n");
 391                                         cprintf(":|/help   (prints this message) \n");
 392                                         cprintf(":|/who    (list users currently in chat) \n");
 393                                         cprintf(":|/whobbs (list users in chat -and- elsewhere) \n");
 394                                         cprintf(":|/me     ('action' line, ala irc) \n");
 395                                         cprintf(":|/msg    (send private message, ala irc) \n");
 396                                         if (is_room_aide()) {
 397                                                 cprintf(":|/kick   (kick another user out of this room) \n");
 398                                         }
 399                                         cprintf(":|/quit   (exit from this chat) \n");
 400                                         cprintf(":|\n");
 401                                         ok_cmd = 1;
 402                                 }
 403                                 if (!strcasecmp(cmdbuf, "/who")) {
 404                                         do_chat_listing(0);
 405                                         ok_cmd = 1;
 406                                 }
 407                                 if (!strcasecmp(cmdbuf, "/whobbs")) {
 408                                         do_chat_listing(1);
 409                                         ok_cmd = 1;
 410                                 }
 411                                 if (!strncasecmp(cmdbuf, "/me ", 4)) {
 412                                         allwrite(&cmdbuf[4], 1, NULL);
 413                                         ok_cmd = 1;
 414                                 }
 415                                 if (!strncasecmp(cmdbuf, "/msg ", 5)) {
 416                                         ok_cmd = 1;
 417                                         strptr1 = &cmdbuf[5];
 418                                         if ((t_context = find_context(&strptr1))) {
 419                                                 allwrite(strptr1, 2, CC->curr_user);
 420                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 421                                                         allwrite(strptr1, 2, t_context->curr_user);
 422                                         } else
 423                                                 cprintf(":|User not found.\n");
 424                                         cprintf("\n");
 425                                 }
 426                                 /* The /kick function is implemented by sending a specific
 427                                  * message to the kicked-out user's context.  When that message
 428                                  * is processed by the read loop, that context will exit.
 429                                  */
 430                                 if ( (!strncasecmp(cmdbuf, "/kick ", 6)) && (is_room_aide()) ) {
 431                                         ok_cmd = 1;
 432                                         strptr1 = &cmdbuf[6];
 433                                         strcat(strptr1, " ");
 434                                         if ((t_context = find_context(&strptr1))) {
 435                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 436                                                         allwrite(strptr1, 3, t_context->curr_user);
 437                                         } else
 438                                                 cprintf(":|User not found.\n");
 439                                         cprintf("\n");
 440                                 }
 441                                 if ((cmdbuf[0] != '/') && (strlen(cmdbuf) > 0)) {
 442                                         ok_cmd = 1;
 443                                         allwrite(cmdbuf, 0, NULL);
 444                                 }
 445                                 if ((!ok_cmd) && (cmdbuf[0]) && (cmdbuf[0] != '\n'))
 446                                         cprintf(":|Command %s is not understood.\n", cmdbuf);
 447
 448                                 strcpy(cmdbuf, "");
 449
 450                         }
 451                 /* now check the queue for new incoming stuff */
 452
 453                 if (CC->fake_username[0])
 454                         un = CC->fake_username;
 455                 else
 456                         un = CC->curr_user;
 457                 if (ChatLastMsg > MyLastMsg) {
 458                         ThisLastMsg = ChatLastMsg;
 459                         for (clptr = ChatQueue; clptr != NULL; clptr = clptr->next) {
 460                                 if ((clptr->chat_seq > MyLastMsg) && ((!clptr->chat_username[0]) || (!strncasecmp(un, clptr->chat_username, 32)))) {
 461                                         if ((!clptr->chat_room[0]) || (!strncasecmp(CC->room.QRname, clptr->chat_room, ROOMNAMELEN))) {
 462                                                 /* Output new chat data */
 463                                                 cprintf("%s\n", clptr->chat_text);
 464
 465                                                 /* See if we've been force-quitted (kicked etc.) */
 466                                                 if (!strcmp(&clptr->chat_text[2], KICKEDMSG)) {
 467                                                         allwrite("<kicked out of this room>", 0, NULL);
 468                                                         cprintf("000\n");
 469                                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 470
 471                                                         /* Kick user out of room */
 472                                                         CtdlInvtKick(CC->user.fullname, 0);
 473
 474                                                         /* And return to the Lobby */
 475                                                         usergoto(config.c_baseroom, 0, 0, NULL, NULL);
 476                                                         return;
 477                                                 }
 478                                         }
 479                                 }
 480                         }
 481                         MyLastMsg = ThisLastMsg;
 482                 }
 483         }
 484 }
 485
 486
 487
 488 /*
 489  * Delete any remaining instant messages
 490  */
 491 void delete_instant_messages(void) {
 492         struct ExpressMessage *ptr;
 493
 494         begin_critical_section(S_SESSION_TABLE);
 495         while (CC->FirstExpressMessage != NULL) {
 496                 ptr = CC->FirstExpressMessage->next;
 497                 if (CC->FirstExpressMessage->text != NULL)
 498                         free(CC->FirstExpressMessage->text);
 499                 free(CC->FirstExpressMessage);
 500                 CC->FirstExpressMessage = ptr;
 501         }
 502         end_critical_section(S_SESSION_TABLE);
 503 }
 504
 505
 506
 507
 508 /*
 509  * Poll for instant messages (OLD METHOD -- ***DEPRECATED ***)
 510  */
 511 void cmd_pexp(char *argbuf)
 512 {
 513         struct ExpressMessage *ptr, *holdptr;
 514
 515         if (CC->FirstExpressMessage == NULL) {
 516                 cprintf("%d No instant messages waiting.\n", ERROR + MESSAGE_NOT_FOUND);
 517                 return;
 518         }
 519         begin_critical_section(S_SESSION_TABLE);
 520         ptr = CC->FirstExpressMessage;
 521         CC->FirstExpressMessage = NULL;
 522         end_critical_section(S_SESSION_TABLE);
 523
 524         cprintf("%d Express msgs:\n", LISTING_FOLLOWS);
 525         while (ptr != NULL) {
 526                 if (ptr->flags && EM_BROADCAST)
 527                         cprintf("Broadcast message ");
 528                 else if (ptr->flags && EM_CHAT)
 529                         cprintf("Chat request ");
 530                 else if (ptr->flags && EM_GO_AWAY)
 531                         cprintf("Please logoff now, as requested ");
 532                 else
 533                         cprintf("Message ");
 534                 cprintf("from %s:\n", ptr->sender);
 535                 if (ptr->text != NULL)
 536                         memfmout(ptr->text, 0, "\n");
 537
 538                 holdptr = ptr->next;
 539                 if (ptr->text != NULL) free(ptr->text);
 540                 free(ptr);
 541                 ptr = holdptr;
 542         }
 543         cprintf("000\n");
 544 }
 545
 546
 547 /*
 548  * Get instant messages (new method)
 549  */
 550 void cmd_gexp(char *argbuf) {
 551         struct ExpressMessage *ptr;
 552
 553         if (CC->FirstExpressMessage == NULL) {
 554                 cprintf("%d No instant messages waiting.\n", ERROR + MESSAGE_NOT_FOUND);
 555                 return;
 556         }
 557
 558         begin_critical_section(S_SESSION_TABLE);
 559         ptr = CC->FirstExpressMessage;
 560         CC->FirstExpressMessage = CC->FirstExpressMessage->next;
 561         end_critical_section(S_SESSION_TABLE);
 562
 563         cprintf("%d %d|%ld|%d|%s|%s|%s\n",
 564                 LISTING_FOLLOWS,
 565                 ((ptr->next != NULL) ? 1 : 0),          /* more msgs? */
 566                 (long)ptr->timestamp,                   /* time sent */
 567                 ptr->flags,                             /* flags */
 568                 ptr->sender,                            /* sender of msg */
 569                 config.c_nodename,                      /* static for now (and possibly deprecated) */
 570                 ptr->sender_email                       /* email or jid of sender */
 571         );
 572
 573         if (ptr->text != NULL) {
 574                 memfmout(ptr->text, 0, "\n");
 575                 if (ptr->text[strlen(ptr->text)-1] != '\n') cprintf("\n");
 576                 free(ptr->text);
 577         }
 578
 579         cprintf("000\n");
 580         free(ptr);
 581 }
 582
 583 /*
 584  * Asynchronously deliver instant messages
 585  */
 586 void cmd_gexp_async(void) {
 587
 588         /* Only do this if the session can handle asynchronous protocol */
 589         if (CC->is_async == 0) return;
 590
 591         /* And don't do it if there's nothing to send. */
 592         if (CC->FirstExpressMessage == NULL) return;
 593
 594         cprintf("%d instant msg\n", ASYNC_MSG + ASYNC_GEXP);
 595 }
 596
 597 /*
 598  * Back end support function for send_instant_message() and company
 599  */
 600 void add_xmsg_to_context(struct CitContext *ccptr, struct ExpressMessage *newmsg)
 601 {
 602         struct ExpressMessage *findend;
 603
 604         if (ccptr->FirstExpressMessage == NULL) {
 605                 ccptr->FirstExpressMessage = newmsg;
 606         }
 607         else {
 608                 findend = ccptr->FirstExpressMessage;
 609                 while (findend->next != NULL) {
 610                         findend = findend->next;
 611                 }
 612                 findend->next = newmsg;
 613         }
 614
 615         /* If the target context is a session which can handle asynchronous
 616          * messages, go ahead and set the flag for that.
 617          */
 618         if (ccptr->is_async) {
 619                 ccptr->async_waiting = 1;
 620                 if (ccptr->state == CON_IDLE) {
 621                         ccptr->state = CON_READY;
 622                 }
 623         }
 624 }
 625
 626
 627
 628
 629 /*
 630  * This is the back end to the instant message sending function.
 631  * Returns the number of users to which the message was sent.
 632  * Sending a zero-length message tests for recipients without sending messages.
 633  */
 634 int send_instant_message(char *lun, char *lem, char *x_user, char *x_msg)
 635 {
 636         int message_sent = 0;           /* number of successful sends */
 637         struct CitContext *ccptr;
 638         struct ExpressMessage *newmsg = NULL;
 639         char *un;
 640         size_t msglen = 0;
 641         int do_send = 0;                /* 1 = send message; 0 = only check for valid recipient */
 642
 643         if (strlen(x_msg) > 0) {
 644                 msglen = strlen(x_msg) + 4;
 645                 do_send = 1;
 646         }
 647
 648         /* find the target user's context and append the message */
 649         begin_critical_section(S_SESSION_TABLE);
 650         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 651
 652                 if (ccptr->fake_username[0]) {
 653                         un = ccptr->fake_username;
 654                 }
 655                 else {
 656                         un = ccptr->user.fullname;
 657                 }
 658
 659                 if ( ((!strcasecmp(un, x_user))
 660                     || (!strcasecmp(x_user, "broadcast")))
 661                     && (ccptr->can_receive_im)
 662                     && ((ccptr->disable_exp == 0)
 663                     || (CC->user.axlevel >= 6)) ) {
 664                         if (do_send) {
 665                                 newmsg = (struct ExpressMessage *)
 666                                         malloc(sizeof (struct ExpressMessage));
 667                                 memset(newmsg, 0,
 668                                         sizeof (struct ExpressMessage));
 669                                 time(&(newmsg->timestamp));
 670                                 safestrncpy(newmsg->sender, lun, sizeof newmsg->sender);
 671                                 safestrncpy(newmsg->sender_email, lem, sizeof newmsg->sender_email);
 672                                 if (!strcasecmp(x_user, "broadcast")) {
 673                                         newmsg->flags |= EM_BROADCAST;
 674                                 }
 675                                 newmsg->text = strdup(x_msg);
 676
 677                                 add_xmsg_to_context(ccptr, newmsg);
 678
 679                                 /* and log it ... */
 680                                 if (ccptr != CC) {
 681                                         log_instant_message(CC, ccptr, newmsg->text);
 682                                 }
 683                         }
 684                         ++message_sent;
 685                 }
 686         }
 687         end_critical_section(S_SESSION_TABLE);
 688         return (message_sent);
 689 }
 690
 691 /*
 692  * send instant messages
 693  */
 694 void cmd_sexp(char *argbuf)
 695 {
 696         int message_sent = 0;
 697         char x_user[USERNAME_SIZE];
 698         char x_msg[1024];
 699         char *lun;
 700         char *lem;
 701         char *x_big_msgbuf = NULL;
 702
 703         if ((!(CC->logged_in)) && (!(CC->internal_pgm))) {
 704                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 705                 return;
 706         }
 707         if (CC->fake_username[0])
 708                 lun = CC->fake_username;
 709         else
 710                 lun = CC->user.fullname;
 711
 712         lem = CC->cs_inet_email;
 713
 714         extract_token(x_user, argbuf, 0, '|', sizeof x_user);
 715         extract_token(x_msg, argbuf, 1, '|', sizeof x_msg);
 716
 717         if (!x_user[0]) {
 718                 cprintf("%d You were not previously paged.\n", ERROR + NO_SUCH_USER);
 719                 return;
 720         }
 721         if ((!strcasecmp(x_user, "broadcast")) && (CC->user.axlevel < 6)) {
 722                 cprintf("%d Higher access required to send a broadcast.\n",
 723                         ERROR + HIGHER_ACCESS_REQUIRED);
 724                 return;
 725         }
 726         /* This loop handles text-transfer pages */
 727         if (!strcmp(x_msg, "-")) {
 728                 message_sent = PerformXmsgHooks(lun, lem, x_user, "");
 729                 if (message_sent == 0) {
 730                         if (getuser(NULL, x_user))
 731                                 cprintf("%d '%s' does not exist.\n",
 732                                                 ERROR + NO_SUCH_USER, x_user);
 733                         else
 734                                 cprintf("%d '%s' is not logged in "
 735                                                 "or is not accepting pages.\n",
 736                                                 ERROR + RESOURCE_NOT_OPEN, x_user);
 737                         return;
 738                 }
 739                 unbuffer_output();
 740                 cprintf("%d Transmit message (will deliver to %d users)\n",
 741                         SEND_LISTING, message_sent);
 742                 x_big_msgbuf = malloc(SIZ);
 743                 memset(x_big_msgbuf, 0, SIZ);
 744                 while (client_getln(x_msg, sizeof x_msg) >= 0 && strcmp(x_msg, "000")) {
 745                         x_big_msgbuf = realloc(x_big_msgbuf,
 746                                strlen(x_big_msgbuf) + strlen(x_msg) + 4);
 747                         if (!IsEmptyStr(x_big_msgbuf))
 748                            if (x_big_msgbuf[strlen(x_big_msgbuf)] != '\n')
 749                                 strcat(x_big_msgbuf, "\n");
 750                         strcat(x_big_msgbuf, x_msg);
 751                 }
 752                 PerformXmsgHooks(lun, lem, x_user, x_big_msgbuf);
 753                 free(x_big_msgbuf);
 754
 755                 /* This loop handles inline pages */
 756         } else {
 757                 message_sent = PerformXmsgHooks(lun, lem, x_user, x_msg);
 758
 759                 if (message_sent > 0) {
 760                         if (!IsEmptyStr(x_msg))
 761                                 cprintf("%d Message sent", CIT_OK);
 762                         else
 763                                 cprintf("%d Ok to send message", CIT_OK);
 764                         if (message_sent > 1)
 765                                 cprintf(" to %d users", message_sent);
 766                         cprintf(".\n");
 767                 } else {
 768                         if (getuser(NULL, x_user))
 769                                 cprintf("%d '%s' does not exist.\n",
 770                                                 ERROR + NO_SUCH_USER, x_user);
 771                         else
 772                                 cprintf("%d '%s' is not logged in "
 773                                                 "or is not accepting pages.\n",
 774                                                 ERROR + RESOURCE_NOT_OPEN, x_user);
 775                 }
 776
 777
 778         }
 779 }
 780
 781
 782
 783 /*
 784  * Enter or exit paging-disabled mode
 785  */
 786 void cmd_dexp(char *argbuf)
 787 {
 788         int new_state;
 789
 790         if (CtdlAccessCheck(ac_logged_in)) return;
 791
 792         new_state = extract_int(argbuf, 0);
 793         if ((new_state == 0) || (new_state == 1)) {
 794                 CC->disable_exp = new_state;
 795         }
 796
 797         cprintf("%d %d\n", CIT_OK, CC->disable_exp);
 798 }
 799
 800
 801 /*
 802  * Request client termination
 803  */
 804 void cmd_reqt(char *argbuf) {
 805         struct CitContext *ccptr;
 806         int sessions = 0;
 807         int which_session;
 808         struct ExpressMessage *newmsg;
 809
 810         if (CtdlAccessCheck(ac_aide)) return;
 811         which_session = extract_int(argbuf, 0);
 812
 813         begin_critical_section(S_SESSION_TABLE);
 814         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 815                 if ((ccptr->cs_pid == which_session) || (which_session == 0)) {
 816
 817                         newmsg = (struct ExpressMessage *)
 818                                 malloc(sizeof (struct ExpressMessage));
 819                         memset(newmsg, 0,
 820                                 sizeof (struct ExpressMessage));
 821                         time(&(newmsg->timestamp));
 822                         safestrncpy(newmsg->sender, CC->user.fullname,
 823                                     sizeof newmsg->sender);
 824                         newmsg->flags |= EM_GO_AWAY;
 825                         newmsg->text = strdup("Automatic logoff requested.");
 826
 827                         add_xmsg_to_context(ccptr, newmsg);
 828                         ++sessions;
 829
 830                 }
 831         }
 832         end_critical_section(S_SESSION_TABLE);
 833         cprintf("%d Sent termination request to %d sessions.\n", CIT_OK, sessions);
 834 }
 835
 836
 837 /*
 838  * This is the back end for flush_conversations_to_disk()
 839  * At this point we've isolated a single conversation (struct imlog)
 840  * and are ready to write it to disk.
 841  */
 842 void flush_individual_conversation(struct imlog *im) {
 843         struct CtdlMessage *msg;
 844         long msgnum = 0;
 845         char roomname[ROOMNAMELEN];
 846
 847         StrBufAppendBufPlain(im->conversation, HKEY(
 848                 "</body>\r\n"
 849                 "</html>\r\n"
 850                 ), 0
 851         );
 852
 853         msg = malloc(sizeof(struct CtdlMessage));
 854         memset(msg, 0, sizeof(struct CtdlMessage));
 855         msg->cm_magic = CTDLMESSAGE_MAGIC;
 856         msg->cm_anon_type = MES_NORMAL;
 857         msg->cm_format_type = FMT_RFC822;
 858         if (!IsEmptyStr(im->usernames[0])) {
 859                 msg->cm_fields['A'] = strdup(im->usernames[0]);
 860         } else {
 861                 msg->cm_fields['A'] = strdup("Citadel");
 862         }
 863         if (!IsEmptyStr(im->usernames[1])) {
 864                 msg->cm_fields['R'] = strdup(im->usernames[1]);
 865         }
 866         msg->cm_fields['O'] = strdup(PAGELOGROOM);
 867         msg->cm_fields['N'] = strdup(NODENAME);
 868         msg->cm_fields['M'] = SmashStrBuf(&im->conversation);   /* we own this memory now */
 869
 870         /* Start with usernums[1] because it's guaranteed to be higher than usernums[0],
 871          * so if there's only one party, usernums[0] will be zero but usernums[1] won't.
 872          * Create the room if necessary.  Note that we create as a type 5 room rather
 873          * than 4, which indicates that it's a personal room but we've already supplied
 874          * the namespace prefix.
 875          *
 876          * In the unlikely event that usernums[1] is zero, a room with an invalid namespace
 877          * prefix will be created.  That's ok because the auto-purger will clean it up later.
 878          */
 879         snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[1], PAGELOGROOM);
 880         create_room(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 881         msgnum = CtdlSubmitMsg(msg, NULL, roomname, 0);
 882         CtdlFreeMessage(msg);
 883
 884         /* If there is a valid user number in usernums[0], save a copy for them too. */
 885         if (im->usernums[0] > 0) {
 886                 snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[0], PAGELOGROOM);
 887                 create_room(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 888                 CtdlSaveMsgPointerInRoom(roomname, msgnum, 0, NULL);
 889         }
 890
 891         /* Finally, if we're logging instant messages globally, do that now. */
 892         if (!IsEmptyStr(config.c_logpages)) {
 893                 create_room(config.c_logpages, 3, "", 0, 1, 1, VIEW_BBS);
 894                 CtdlSaveMsgPointerInRoom(config.c_logpages, msgnum, 0, NULL);
 895         }
 896
 897 }
 898
 899 /*
 900  * Locate instant message conversations which have gone idle
 901  * (or, if the server is shutting down, locate *all* conversations)
 902  * and flush them to disk (in the participants' log rooms, etc.)
 903  */
 904 void flush_conversations_to_disk(time_t if_older_than) {
 905
 906         struct imlog *flush_these = NULL;
 907         struct imlog *dont_flush_these = NULL;
 908         struct imlog *imptr = NULL;
 909
 910         begin_critical_section(S_IM_LOGS);
 911         while (imlist)
 912         {
 913                 imptr = imlist;
 914                 imlist = imlist->next;
 915                 if ((time(NULL) - imptr->lastmsg) > if_older_than)
 916                 {
 917                         /* This conversation qualifies.  Move it to the list of ones to flush. */
 918                         imptr->next = flush_these;
 919                         flush_these = imptr;
 920                 }
 921                 else  {
 922                         /* Move it to the list of ones not to flush. */
 923                         imptr->next = dont_flush_these;
 924                         dont_flush_these = imptr;
 925                 }
 926         }
 927         imlist = dont_flush_these;
 928         end_critical_section(S_IM_LOGS);
 929
 930         /* We are now outside of the critical section, and we are the only thread holding a
 931          * pointer to a linked list of conversations to be flushed to disk.
 932          */
 933         while (flush_these) {
 934
 935                 flush_individual_conversation(flush_these);     /* This will free the string buffer */
 936                 imptr = flush_these;
 937                 flush_these = flush_these->next;
 938                 free(imptr);
 939         }
 940 }
 941
 942
 943
 944 void chat_timer(void) {
 945         flush_conversations_to_disk(300);       /* Anything that hasn't peeped in more than 5 minutes */
 946 }
 947
 948 void chat_shutdown(void) {
 949         flush_conversations_to_disk(0);         /* Get it ALL onto disk NOW. */
 950 }
 951
 952 CTDL_MODULE_INIT(chat)
 953 {
 954         if (!threading)
 955         {
 956                 CtdlRegisterProtoHook(cmd_chat, "CHAT", "Begin real-time chat");
 957                 CtdlRegisterProtoHook(cmd_pexp, "PEXP", "Poll for instant messages");
 958                 CtdlRegisterProtoHook(cmd_gexp, "GEXP", "Get instant messages");
 959                 CtdlRegisterProtoHook(cmd_sexp, "SEXP", "Send an instant message");
 960                 CtdlRegisterProtoHook(cmd_dexp, "DEXP", "Disable instant messages");
 961                 CtdlRegisterProtoHook(cmd_reqt, "REQT", "Request client termination");
 962                 CtdlRegisterSessionHook(cmd_gexp_async, EVT_ASYNC);
 963                 CtdlRegisterSessionHook(delete_instant_messages, EVT_STOP);
 964                 CtdlRegisterXmsgHook(send_instant_message, XMSG_PRI_LOCAL);
 965                 CtdlRegisterSessionHook(chat_timer, EVT_TIMER);
 966                 CtdlRegisterSessionHook(chat_shutdown, EVT_SHUTDOWN);
 967         }
 968
 969         /* return our Subversion id for the Log */
 970         return "$Id$";
 971 }