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 Instant Messages.
   6  *
   7  * Copyright (c) 1987-2010 by the citadel.org team
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  */
  24 #include "sysdep.h"
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <signal.h>
  30 #include <pwd.h>
  31 #include <errno.h>
  32 #include <sys/types.h>
  33
  34 #if TIME_WITH_SYS_TIME
  35 # include <sys/time.h>
  36 # include <time.h>
  37 #else
  38 # if HAVE_SYS_TIME_H
  39 #  include <sys/time.h>
  40 # else
  41 #  include <time.h>
  42 # endif
  43 #endif
  44
  45 #include <sys/wait.h>
  46 #include <string.h>
  47 #include <limits.h>
  48 #include <libcitadel.h>
  49 #include "citadel.h"
  50 #include "server.h"
  51 #include "serv_chat.h"
  52 #include "citserver.h"
  53 #include "support.h"
  54 #include "config.h"
  55 #include "msgbase.h"
  56 #include "user_ops.h"
  57
  58 #ifndef HAVE_SNPRINTF
  59 #include "snprintf.h"
  60 #endif
  61
  62 #include "ctdl_module.h"
  63
  64 struct ChatLine *ChatQueue = NULL;
  65 int ChatLastMsg = 0;
  66
  67 struct imlog {
  68         struct imlog *next;
  69         long usernums[2];
  70         char usernames[2][128];
  71         time_t lastmsg;
  72         int last_serial;
  73         StrBuf *conversation;
  74 };
  75
  76 struct imlog *imlist = NULL;
  77
  78
  79
  80
  81 /*
  82  * FIXME: OMG this module is realy horrible to the rest of the system when accessing contexts.
  83  * It pays no regard at all to how long it may have the context list locked for.
  84  * It carries out IO whilst the context list is locked.
  85  * I'd recomend disabling this module altogether for the moment.
  86  */
  87
  88 /*
  89  * This function handles the logging of instant messages to disk.
  90  */
  91 void log_instant_message(struct CitContext *me, struct CitContext *them, char *msgtext, int serial_number)
  92 {
  93         long usernums[2];
  94         long t;
  95         struct imlog *iptr = NULL;
  96         struct imlog *this_im = NULL;
  97
  98         memset(usernums, 0, sizeof usernums);
  99         usernums[0] = me->user.usernum;
 100         usernums[1] = them->user.usernum;
 101
 102         /* Always put the lower user number first, so we can use the array as a hash value which
 103          * represents a pair of users.  For a broadcast message one of the users will be 0.
 104          */
 105         if (usernums[0] > usernums[1]) {
 106                 t = usernums[0];
 107                 usernums[0] = usernums[1];
 108                 usernums[1] = t;
 109         }
 110
 111         begin_critical_section(S_IM_LOGS);
 112
 113         /* Look for an existing conversation in the hash table.
 114          * If not found, create a new one.
 115          */
 116
 117         this_im = NULL;
 118         for (iptr = imlist; iptr != NULL; iptr = iptr->next) {
 119                 if ((iptr->usernums[0] == usernums[0]) && (iptr->usernums[1] == usernums[1])) {
 120                         /* Existing conversation */
 121                         this_im = iptr;
 122                 }
 123         }
 124         if (this_im == NULL) {
 125                 /* New conversation */
 126                 this_im = malloc(sizeof(struct imlog));
 127                 memset(this_im, 0, sizeof (struct imlog));
 128                 this_im->usernums[0] = usernums[0];
 129                 this_im->usernums[1] = usernums[1];
 130                 /* usernames[] and usernums[] might not be in the same order.  This is not an error. */
 131                 if (me) {
 132                         safestrncpy(this_im->usernames[0], me->user.fullname, sizeof this_im->usernames[0]);
 133                 }
 134                 if (them) {
 135                         safestrncpy(this_im->usernames[1], them->user.fullname, sizeof this_im->usernames[1]);
 136                 }
 137                 this_im->conversation = NewStrBuf();
 138                 this_im->next = imlist;
 139                 imlist = this_im;
 140                 StrBufAppendBufPlain(this_im->conversation, HKEY(
 141                         "Content-type: text/html\r\n"
 142                         "Content-transfer-encoding: 7bit\r\n"
 143                         "\r\n"
 144                         "<html><body>\r\n"
 145                         ), 0);
 146         }
 147
 148
 149         /* Since it's possible for this function to get called more than once if a user is logged
 150          * in on multiple sessions, we use the message's serial number to keep track of whether
 151          * we've already logged it.
 152          */
 153         if (this_im->last_serial != serial_number)
 154         {
 155                 this_im->lastmsg = time(NULL);          /* Touch the timestamp so we know when to flush */
 156                 this_im->last_serial = serial_number;
 157                 StrBufAppendBufPlain(this_im->conversation, HKEY("<p><b>"), 0);
 158                 StrBufAppendBufPlain(this_im->conversation, me->user.fullname, -1, 0);
 159                 StrBufAppendBufPlain(this_im->conversation, HKEY(":</b> "), 0);
 160                 StrEscAppend(this_im->conversation, NULL, msgtext, 0, 0);
 161                 StrBufAppendBufPlain(this_im->conversation, HKEY("</p>\r\n"), 0);
 162         }
 163         end_critical_section(S_IM_LOGS);
 164 }
 165
 166 /*
 167  * This message can be set to anything you want, but it is
 168  * checked for consistency so don't move it away from here.
 169  */
 170 #define KICKEDMSG "You have been kicked out of this room."
 171
 172 void allwrite(char *cmdbuf, int flag, char *username)
 173 {
 174         FILE *fp;
 175         char bcast[SIZ];
 176         char *un;
 177         struct ChatLine *clptr, *clnew;
 178         time_t now;
 179
 180         if (CC->fake_username[0])
 181                 un = CC->fake_username;
 182         else
 183                 un = CC->user.fullname;
 184         if (flag == 1) {
 185                 snprintf(bcast, sizeof bcast, ":|<%s %s>", un, cmdbuf);
 186         } else if (flag == 0) {
 187                 snprintf(bcast, sizeof bcast, "%s|%s", un, cmdbuf);
 188         } else if (flag == 2) {
 189                 snprintf(bcast, sizeof bcast, ":|<%s whispers %s>", un, cmdbuf);
 190         } else if (flag == 3) {
 191                 snprintf(bcast, sizeof bcast, ":|%s", KICKEDMSG);
 192         }
 193         if ((strcasecmp(cmdbuf, "NOOP")) && (flag != 2)) {
 194                 fp = fopen(CHATLOG, "a");
 195                 if (fp != NULL)
 196                         fprintf(fp, "%s\n", bcast);
 197                 fclose(fp);
 198         }
 199         clnew = (struct ChatLine *) malloc(sizeof(struct ChatLine));
 200         memset(clnew, 0, sizeof(struct ChatLine));
 201         if (clnew == NULL) {
 202                 fprintf(stderr, "citserver: cannot alloc chat line: %s\n",
 203                         strerror(errno));
 204                 return;
 205         }
 206         time(&now);
 207         clnew->next = NULL;
 208         clnew->chat_time = now;
 209         safestrncpy(clnew->chat_room, CC->room.QRname,
 210                         sizeof clnew->chat_room);
 211         clnew->chat_room[sizeof clnew->chat_room - 1] = 0;
 212         if (username) {
 213                 safestrncpy(clnew->chat_username, username,
 214                         sizeof clnew->chat_username);
 215                 clnew->chat_username[sizeof clnew->chat_username - 1] = 0;
 216         } else
 217                 clnew->chat_username[0] = '\0';
 218         safestrncpy(clnew->chat_text, bcast, sizeof clnew->chat_text);
 219
 220         /* Here's the critical section.
 221          * First, add the new message to the queue...
 222          */
 223         begin_critical_section(S_CHATQUEUE);
 224         ++ChatLastMsg;
 225         clnew->chat_seq = ChatLastMsg;
 226         if (ChatQueue == NULL) {
 227                 ChatQueue = clnew;
 228         } else {
 229                 for (clptr = ChatQueue; clptr->next != NULL; clptr = clptr->next);;
 230                 clptr->next = clnew;
 231         }
 232
 233         /* Then, before releasing the lock, free the expired messages */
 234         while ((ChatQueue != NULL) && (now - ChatQueue->chat_time >= 120L)) {
 235                 clptr = ChatQueue;
 236                 ChatQueue = ChatQueue->next;
 237                 free(clptr);
 238         }
 239         end_critical_section(S_CHATQUEUE);
 240 }
 241
 242
 243 CitContext *find_context(char **unstr)
 244 {
 245         CitContext *t_cc, *found_cc = NULL;
 246         char *name, *tptr;
 247
 248         if ((!*unstr) || (!unstr))
 249                 return (NULL);
 250
 251         begin_critical_section(S_SESSION_TABLE);
 252         for (t_cc = ContextList; ((t_cc) && (!found_cc)); t_cc = t_cc->next) {
 253                 if (t_cc->fake_username[0])
 254                         name = t_cc->fake_username;
 255                 else
 256                         name = t_cc->curr_user;
 257                 tptr = *unstr;
 258                 if ((!strncasecmp(name, tptr, strlen(name))) && (tptr[strlen(name)] == ' ')) {
 259                         found_cc = t_cc;
 260                         *unstr = &(tptr[strlen(name) + 1]);
 261                 }
 262         }
 263         end_critical_section(S_SESSION_TABLE);
 264
 265         return (found_cc);
 266 }
 267
 268 /*
 269  * List users in chat.
 270  * allflag ==   0 = list users in chat
 271  *              1 = list users in chat, followed by users not in chat
 272  *              2 = display count only
 273  */
 274
 275 void do_chat_listing(int allflag)
 276 {
 277         struct CitContext *ccptr;
 278         int count = 0;
 279         int count_elsewhere = 0;
 280         char roomname[ROOMNAMELEN];
 281
 282         if ((allflag == 0) || (allflag == 1))
 283                 cprintf(":|\n:| Users currently in chat:\n");
 284         begin_critical_section(S_SESSION_TABLE);
 285         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 286                 if (ccptr->cs_flags & CS_CHAT) {
 287                         if (!strcasecmp(ccptr->room.QRname,
 288                            CC->room.QRname)) {
 289                                 ++count;
 290                         }
 291                         else {
 292                                 ++count_elsewhere;
 293                         }
 294                 }
 295
 296                 GenerateRoomDisplay(roomname, ccptr, CC);
 297                 if ((CC->user.axlevel < AxAideU) && (!IsEmptyStr(ccptr->fake_roomname))) {
 298                         strcpy(roomname, ccptr->fake_roomname);
 299                 }
 300
 301                 if ((ccptr->cs_flags & CS_CHAT) && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 302                         if ((allflag == 0) || (allflag == 1)) {
 303                                 cprintf(":| %-25s <%s>:\n",
 304                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 305                                         roomname);
 306                         }
 307                 }
 308         }
 309
 310         if (allflag == 1) {
 311                 cprintf(":|\n:| Users not in chat:\n");
 312                 for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 313
 314                         GenerateRoomDisplay(roomname, ccptr, CC);
 315                         if ((CC->user.axlevel < AxAideU)
 316                         && (!IsEmptyStr(ccptr->fake_roomname))) {
 317                                 strcpy(roomname, ccptr->fake_roomname);
 318                         }
 319
 320                         if (((ccptr->cs_flags & CS_CHAT) == 0)
 321                             && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 322                                 cprintf(":| %-25s <%s>:\n",
 323                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 324                                         roomname);
 325                         }
 326                 }
 327         }
 328         end_critical_section(S_SESSION_TABLE);
 329
 330         if (allflag == 2) {
 331                 if (count > 1) {
 332                         cprintf(":|There are %d users here.\n", count);
 333                 }
 334                 else {
 335                         cprintf(":|Note: you are the only one here.\n");
 336                 }
 337                 if (count_elsewhere > 0) {
 338                         cprintf(":|There are %d users chatting in other rooms.\n", count_elsewhere);
 339                 }
 340         }
 341
 342         cprintf(":|\n");
 343 }
 344
 345
 346 void cmd_chat(char *argbuf)
 347 {
 348         /* FIXME chat has been broken by the underlying buffered I/O layer */
 349         cprintf("%d Chat is currently disabled at this site.\n", ERROR);
 350         return;
 351
 352 #if 0
 353         char cmdbuf[SIZ];
 354         char *un;
 355         char *strptr1;
 356         int MyLastMsg, ThisLastMsg;
 357         struct ChatLine *clptr;
 358         struct CitContext *t_context;
 359         int retval;
 360         CitContext *CCC = CC;
 361
 362         if (!(CCC->logged_in)) {
 363                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 364                 return;
 365         }
 366
 367         CCC->cs_flags = CCC->cs_flags | CS_CHAT;
 368         cprintf("%d Entering chat mode (type '/help' for available commands)\n",
 369                 START_CHAT_MODE);
 370         unbuffer_output();
 371
 372         MyLastMsg = ChatLastMsg;
 373
 374         if ((CCC->cs_flags & CS_STEALTH) == 0) {
 375                 allwrite("<entering chat>", 0, NULL);
 376         }
 377         strcpy(cmdbuf, "");
 378
 379         do_chat_listing(2);
 380
 381         while (1) {
 382                 int ok_cmd;
 383                 int linelen;
 384
 385                 ok_cmd = 0;
 386                 linelen = strlen(cmdbuf);
 387                 if (linelen > 100) --linelen;   /* truncate too-long lines */
 388                 cmdbuf[linelen + 1] = 0;
 389
 390                 retval = client_read_to(&cmdbuf[linelen], 1, 2);
 391
 392                 if (retval < 0 || CCC->kill_me) {       /* socket broken? */
 393                         if ((CCC->cs_flags & CS_STEALTH) == 0) {
 394                                 allwrite("<disconnected>", 0, NULL);
 395                         }
 396                         return;
 397                 }
 398
 399                 /* if we have a complete line, do send processing */
 400                 if (!IsEmptyStr(cmdbuf))
 401                         if (cmdbuf[strlen(cmdbuf) - 1] == 10) {
 402                                 cmdbuf[strlen(cmdbuf) - 1] = 0;
 403                                 time(&CCC->lastcmd);
 404                                 time(&CCC->lastidle);
 405
 406                                 if ((!strcasecmp(cmdbuf, "exit"))
 407                                     || (!strcasecmp(cmdbuf, "/exit"))
 408                                     || (!strcasecmp(cmdbuf, "quit"))
 409                                     || (!strcasecmp(cmdbuf, "logout"))
 410                                     || (!strcasecmp(cmdbuf, "logoff"))
 411                                     || (!strcasecmp(cmdbuf, "/q"))
 412                                     || (!strcasecmp(cmdbuf, ".q"))
 413                                     || (!strcasecmp(cmdbuf, "/quit"))
 414                                     )
 415                                         strcpy(cmdbuf, "000");
 416
 417                                 if (!strcmp(cmdbuf, "000")) {
 418                                         if ((CCC->cs_flags & CS_STEALTH) == 0) {
 419                                                 allwrite("<exiting chat>", 0, NULL);
 420                                         }
 421                                         sleep(1);
 422                                         cprintf("000\n");
 423                                         CCC->cs_flags = CCC->cs_flags - CS_CHAT;
 424                                         return;
 425                                 }
 426                                 if ((!strcasecmp(cmdbuf, "/help"))
 427                                     || (!strcasecmp(cmdbuf, "help"))
 428                                     || (!strcasecmp(cmdbuf, "/?"))
 429                                     || (!strcasecmp(cmdbuf, "?"))) {
 430                                         cprintf(":|\n");
 431                                         cprintf(":|Available commands: \n");
 432                                         cprintf(":|/help   (prints this message) \n");
 433                                         cprintf(":|/who    (list users currently in chat) \n");
 434                                         cprintf(":|/whobbs (list users in chat -and- elsewhere) \n");
 435                                         cprintf(":|/me     ('action' line, ala irc) \n");
 436                                         cprintf(":|/msg    (send private message, ala irc) \n");
 437                                         if (is_room_aide()) {
 438                                                 cprintf(":|/kick   (kick another user out of this room) \n");
 439                                         }
 440                                         cprintf(":|/quit   (exit from this chat) \n");
 441                                         cprintf(":|\n");
 442                                         ok_cmd = 1;
 443                                 }
 444                                 if (!strcasecmp(cmdbuf, "/who")) {
 445                                         do_chat_listing(0);
 446                                         ok_cmd = 1;
 447                                 }
 448                                 if (!strcasecmp(cmdbuf, "/whobbs")) {
 449                                         do_chat_listing(1);
 450                                         ok_cmd = 1;
 451                                 }
 452                                 if (!strncasecmp(cmdbuf, "/me ", 4)) {
 453                                         allwrite(&cmdbuf[4], 1, NULL);
 454                                         ok_cmd = 1;
 455                                 }
 456                                 if (!strncasecmp(cmdbuf, "/msg ", 5)) {
 457                                         ok_cmd = 1;
 458                                         strptr1 = &cmdbuf[5];
 459                                         if ((t_context = find_context(&strptr1))) {
 460                                                 allwrite(strptr1, 2, CCC->curr_user);
 461                                                 if (strcasecmp(CCC->curr_user, t_context->curr_user))
 462                                                         allwrite(strptr1, 2, t_context->curr_user);
 463                                         } else
 464                                                 cprintf(":|User not found.\n");
 465                                         cprintf("\n");
 466                                 }
 467                                 /* The /kick function is implemented by sending a specific
 468                                  * message to the kicked-out user's context.  When that message
 469                                  * is processed by the read loop, that context will exit.
 470                                  */
 471                                 if ( (!strncasecmp(cmdbuf, "/kick ", 6)) && (is_room_aide()) ) {
 472                                         ok_cmd = 1;
 473                                         strptr1 = &cmdbuf[6];
 474                                         strcat(strptr1, " ");
 475                                         if ((t_context = find_context(&strptr1))) {
 476                                                 if (strcasecmp(CCC->curr_user, t_context->curr_user))
 477                                                         allwrite(strptr1, 3, t_context->curr_user);
 478                                         } else
 479                                                 cprintf(":|User not found.\n");
 480                                         cprintf("\n");
 481                                 }
 482                                 if ((cmdbuf[0] != '/') && (strlen(cmdbuf) > 0)) {
 483                                         ok_cmd = 1;
 484                                         allwrite(cmdbuf, 0, NULL);
 485                                 }
 486                                 if ((!ok_cmd) && (cmdbuf[0]) && (cmdbuf[0] != '\n'))
 487                                         cprintf(":|Command %s is not understood.\n", cmdbuf);
 488
 489                                 strcpy(cmdbuf, "");
 490
 491                         }
 492                 /* now check the queue for new incoming stuff */
 493
 494                 if (CCC->fake_username[0])
 495                         un = CCC->fake_username;
 496                 else
 497                         un = CCC->curr_user;
 498                 if (ChatLastMsg > MyLastMsg) {
 499                         ThisLastMsg = ChatLastMsg;
 500                         for (clptr = ChatQueue; clptr != NULL; clptr = clptr->next) {
 501                                 if ((clptr->chat_seq > MyLastMsg) && ((!clptr->chat_username[0]) || (!strncasecmp(un, clptr->chat_username, 32)))) {
 502                                         if ((!clptr->chat_room[0]) || (!strncasecmp(CCC->room.QRname, clptr->chat_room, ROOMNAMELEN))) {
 503                                                 /* Output new chat data */
 504                                                 cprintf("%s\n", clptr->chat_text);
 505
 506                                                 /* See if we've been force-quitted (kicked etc.) */
 507                                                 if (!strcmp(&clptr->chat_text[2], KICKEDMSG)) {
 508                                                         allwrite("<kicked out of this room>", 0, NULL);
 509                                                         cprintf("000\n");
 510                                                         CCC->cs_flags = CCC->cs_flags - CS_CHAT;
 511
 512                                                         /* Kick user out of room */
 513                                                         CtdlInvtKick(CCC->user.fullname, 0);
 514
 515                                                         /* And return to the Lobby */
 516                                                         CtdlUserGoto(config.c_baseroom, 0, 0, NULL, NULL);
 517                                                         return;
 518                                                 }
 519                                         }
 520                                 }
 521                         }
 522                         MyLastMsg = ThisLastMsg;
 523                 }
 524         }
 525 #endif
 526 }
 527
 528
 529
 530 /*
 531  * Delete any remaining instant messages
 532  */
 533 void delete_instant_messages(void) {
 534         struct ExpressMessage *ptr;
 535
 536         begin_critical_section(S_SESSION_TABLE);
 537         while (CC->FirstExpressMessage != NULL) {
 538                 ptr = CC->FirstExpressMessage->next;
 539                 if (CC->FirstExpressMessage->text != NULL)
 540                         free(CC->FirstExpressMessage->text);
 541                 free(CC->FirstExpressMessage);
 542                 CC->FirstExpressMessage = ptr;
 543         }
 544         end_critical_section(S_SESSION_TABLE);
 545 }
 546
 547
 548
 549 /*
 550  * Retrieve instant messages
 551  */
 552 void cmd_gexp(char *argbuf) {
 553         struct ExpressMessage *ptr;
 554
 555         if (CC->FirstExpressMessage == NULL) {
 556                 cprintf("%d No instant messages waiting.\n", ERROR + MESSAGE_NOT_FOUND);
 557                 return;
 558         }
 559
 560         begin_critical_section(S_SESSION_TABLE);
 561         ptr = CC->FirstExpressMessage;
 562         CC->FirstExpressMessage = CC->FirstExpressMessage->next;
 563         end_critical_section(S_SESSION_TABLE);
 564
 565         cprintf("%d %d|%ld|%d|%s|%s|%s\n",
 566                 LISTING_FOLLOWS,
 567                 ((ptr->next != NULL) ? 1 : 0),          /* more msgs? */
 568                 (long)ptr->timestamp,                   /* time sent */
 569                 ptr->flags,                             /* flags */
 570                 ptr->sender,                            /* sender of msg */
 571                 config.c_nodename,                      /* static for now (and possibly deprecated) */
 572                 ptr->sender_email                       /* email or jid of sender */
 573         );
 574
 575         if (ptr->text != NULL) {
 576                 memfmout(ptr->text, "\n");
 577                 free(ptr->text);
 578         }
 579
 580         cprintf("000\n");
 581         free(ptr);
 582 }
 583
 584 /*
 585  * Asynchronously deliver instant messages
 586  */
 587 void cmd_gexp_async(void) {
 588
 589         /* Only do this if the session can handle asynchronous protocol */
 590         if (CC->is_async == 0) return;
 591
 592         /* And don't do it if there's nothing to send. */
 593         if (CC->FirstExpressMessage == NULL) return;
 594
 595         cprintf("%d instant msg\n", ASYNC_MSG + ASYNC_GEXP);
 596 }
 597
 598 /*
 599  * Back end support function for send_instant_message() and company
 600  */
 601 void add_xmsg_to_context(struct CitContext *ccptr, struct ExpressMessage *newmsg)
 602 {
 603         struct ExpressMessage *findend;
 604
 605         if (ccptr->FirstExpressMessage == NULL) {
 606                 ccptr->FirstExpressMessage = newmsg;
 607         }
 608         else {
 609                 findend = ccptr->FirstExpressMessage;
 610                 while (findend->next != NULL) {
 611                         findend = findend->next;
 612                 }
 613                 findend->next = newmsg;
 614         }
 615
 616         /* If the target context is a session which can handle asynchronous
 617          * messages, go ahead and set the flag for that.
 618          */
 619         set_async_waiting(ccptr);
 620 }
 621
 622
 623
 624
 625 /*
 626  * This is the back end to the instant message sending function.
 627  * Returns the number of users to which the message was sent.
 628  * Sending a zero-length message tests for recipients without sending messages.
 629  */
 630 int send_instant_message(char *lun, char *lem, char *x_user, char *x_msg)
 631 {
 632         int message_sent = 0;           /* number of successful sends */
 633         struct CitContext *ccptr;
 634         struct ExpressMessage *newmsg = NULL;
 635         char *un;
 636         int do_send = 0;                /* 1 = send message; 0 = only check for valid recipient */
 637         static int serial_number = 0;   /* this keeps messages from getting logged twice */
 638
 639         if (strlen(x_msg) > 0) {
 640                 do_send = 1;
 641         }
 642
 643         /* find the target user's context and append the message */
 644         begin_critical_section(S_SESSION_TABLE);
 645         ++serial_number;
 646         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 647
 648                 if (ccptr->fake_username[0]) {
 649                         un = ccptr->fake_username;
 650                 }
 651                 else {
 652                         un = ccptr->user.fullname;
 653                 }
 654
 655                 if ( ((!strcasecmp(un, x_user))
 656                     || (!strcasecmp(x_user, "broadcast")))
 657                     && (ccptr->can_receive_im)
 658                     && ((ccptr->disable_exp == 0)
 659                     || (CC->user.axlevel >= AxAideU)) ) {
 660                         if (do_send) {
 661                                 newmsg = (struct ExpressMessage *) malloc(sizeof (struct ExpressMessage));
 662                                 memset(newmsg, 0, sizeof (struct ExpressMessage));
 663                                 time(&(newmsg->timestamp));
 664                                 safestrncpy(newmsg->sender, lun, sizeof newmsg->sender);
 665                                 safestrncpy(newmsg->sender_email, lem, sizeof newmsg->sender_email);
 666                                 if (!strcasecmp(x_user, "broadcast")) {
 667                                         newmsg->flags |= EM_BROADCAST;
 668                                 }
 669                                 newmsg->text = strdup(x_msg);
 670
 671                                 add_xmsg_to_context(ccptr, newmsg);
 672
 673                                 /* and log it ... */
 674                                 if (ccptr != CC) {
 675                                         log_instant_message(CC, ccptr, newmsg->text, serial_number);
 676                                 }
 677                         }
 678                         ++message_sent;
 679                 }
 680         }
 681         end_critical_section(S_SESSION_TABLE);
 682         return (message_sent);
 683 }
 684
 685 /*
 686  * send instant messages
 687  */
 688 void cmd_sexp(char *argbuf)
 689 {
 690         int message_sent = 0;
 691         char x_user[USERNAME_SIZE];
 692         char x_msg[1024];
 693         char *lun;
 694         char *lem;
 695         char *x_big_msgbuf = NULL;
 696
 697         if ((!(CC->logged_in)) && (!(CC->internal_pgm))) {
 698                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 699                 return;
 700         }
 701         if (CC->fake_username[0])
 702                 lun = CC->fake_username;
 703         else
 704                 lun = CC->user.fullname;
 705
 706         lem = CC->cs_inet_email;
 707
 708         extract_token(x_user, argbuf, 0, '|', sizeof x_user);
 709         extract_token(x_msg, argbuf, 1, '|', sizeof x_msg);
 710
 711         if (!x_user[0]) {
 712                 cprintf("%d You were not previously paged.\n", ERROR + NO_SUCH_USER);
 713                 return;
 714         }
 715         if ((!strcasecmp(x_user, "broadcast")) && (CC->user.axlevel < AxAideU)) {
 716                 cprintf("%d Higher access required to send a broadcast.\n",
 717                         ERROR + HIGHER_ACCESS_REQUIRED);
 718                 return;
 719         }
 720         /* This loop handles text-transfer pages */
 721         if (!strcmp(x_msg, "-")) {
 722                 message_sent = PerformXmsgHooks(lun, lem, x_user, "");
 723                 if (message_sent == 0) {
 724                         if (CtdlGetUser(NULL, x_user))
 725                                 cprintf("%d '%s' does not exist.\n",
 726                                                 ERROR + NO_SUCH_USER, x_user);
 727                         else
 728                                 cprintf("%d '%s' is not logged in "
 729                                                 "or is not accepting pages.\n",
 730                                                 ERROR + RESOURCE_NOT_OPEN, x_user);
 731                         return;
 732                 }
 733                 unbuffer_output();
 734                 cprintf("%d Transmit message (will deliver to %d users)\n",
 735                         SEND_LISTING, message_sent);
 736                 x_big_msgbuf = malloc(SIZ);
 737                 memset(x_big_msgbuf, 0, SIZ);
 738                 while (client_getln(x_msg, sizeof x_msg) >= 0 && strcmp(x_msg, "000")) {
 739                         x_big_msgbuf = realloc(x_big_msgbuf,
 740                                strlen(x_big_msgbuf) + strlen(x_msg) + 4);
 741                         if (!IsEmptyStr(x_big_msgbuf))
 742                            if (x_big_msgbuf[strlen(x_big_msgbuf)] != '\n')
 743                                 strcat(x_big_msgbuf, "\n");
 744                         strcat(x_big_msgbuf, x_msg);
 745                 }
 746                 PerformXmsgHooks(lun, lem, x_user, x_big_msgbuf);
 747                 free(x_big_msgbuf);
 748
 749                 /* This loop handles inline pages */
 750         } else {
 751                 message_sent = PerformXmsgHooks(lun, lem, x_user, x_msg);
 752
 753                 if (message_sent > 0) {
 754                         if (!IsEmptyStr(x_msg))
 755                                 cprintf("%d Message sent", CIT_OK);
 756                         else
 757                                 cprintf("%d Ok to send message", CIT_OK);
 758                         if (message_sent > 1)
 759                                 cprintf(" to %d users", message_sent);
 760                         cprintf(".\n");
 761                 } else {
 762                         if (CtdlGetUser(NULL, x_user))
 763                                 cprintf("%d '%s' does not exist.\n",
 764                                                 ERROR + NO_SUCH_USER, x_user);
 765                         else
 766                                 cprintf("%d '%s' is not logged in "
 767                                                 "or is not accepting pages.\n",
 768                                                 ERROR + RESOURCE_NOT_OPEN, x_user);
 769                 }
 770
 771
 772         }
 773 }
 774
 775
 776
 777 /*
 778  * Enter or exit paging-disabled mode
 779  */
 780 void cmd_dexp(char *argbuf)
 781 {
 782         int new_state;
 783
 784         if (CtdlAccessCheck(ac_logged_in)) return;
 785
 786         new_state = extract_int(argbuf, 0);
 787         if ((new_state == 0) || (new_state == 1)) {
 788                 CC->disable_exp = new_state;
 789         }
 790
 791         cprintf("%d %d\n", CIT_OK, CC->disable_exp);
 792 }
 793
 794
 795 /*
 796  * Request client termination
 797  */
 798 void cmd_reqt(char *argbuf) {
 799         struct CitContext *ccptr;
 800         int sessions = 0;
 801         int which_session;
 802         struct ExpressMessage *newmsg;
 803
 804         if (CtdlAccessCheck(ac_aide)) return;
 805         which_session = extract_int(argbuf, 0);
 806
 807         begin_critical_section(S_SESSION_TABLE);
 808         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 809                 if ((ccptr->cs_pid == which_session) || (which_session == 0)) {
 810
 811                         newmsg = (struct ExpressMessage *)
 812                                 malloc(sizeof (struct ExpressMessage));
 813                         memset(newmsg, 0,
 814                                 sizeof (struct ExpressMessage));
 815                         time(&(newmsg->timestamp));
 816                         safestrncpy(newmsg->sender, CC->user.fullname,
 817                                     sizeof newmsg->sender);
 818                         newmsg->flags |= EM_GO_AWAY;
 819                         newmsg->text = strdup("Automatic logoff requested.");
 820
 821                         add_xmsg_to_context(ccptr, newmsg);
 822                         ++sessions;
 823
 824                 }
 825         }
 826         end_critical_section(S_SESSION_TABLE);
 827         cprintf("%d Sent termination request to %d sessions.\n", CIT_OK, sessions);
 828 }
 829
 830
 831 /*
 832  * This is the back end for flush_conversations_to_disk()
 833  * At this point we've isolated a single conversation (struct imlog)
 834  * and are ready to write it to disk.
 835  */
 836 void flush_individual_conversation(struct imlog *im) {
 837         struct CtdlMessage *msg;
 838         long msgnum = 0;
 839         char roomname[ROOMNAMELEN];
 840
 841         StrBufAppendBufPlain(im->conversation, HKEY(
 842                 "</body>\r\n"
 843                 "</html>\r\n"
 844                 ), 0
 845         );
 846
 847         msg = malloc(sizeof(struct CtdlMessage));
 848         memset(msg, 0, sizeof(struct CtdlMessage));
 849         msg->cm_magic = CTDLMESSAGE_MAGIC;
 850         msg->cm_anon_type = MES_NORMAL;
 851         msg->cm_format_type = FMT_RFC822;
 852         if (!IsEmptyStr(im->usernames[0])) {
 853                 msg->cm_fields['A'] = strdup(im->usernames[0]);
 854         } else {
 855                 msg->cm_fields['A'] = strdup("Citadel");
 856         }
 857         if (!IsEmptyStr(im->usernames[1])) {
 858                 msg->cm_fields['R'] = strdup(im->usernames[1]);
 859         }
 860         msg->cm_fields['O'] = strdup(PAGELOGROOM);
 861         msg->cm_fields['N'] = strdup(NODENAME);
 862         msg->cm_fields['M'] = SmashStrBuf(&im->conversation);   /* we own this memory now */
 863
 864         /* Start with usernums[1] because it's guaranteed to be higher than usernums[0],
 865          * so if there's only one party, usernums[0] will be zero but usernums[1] won't.
 866          * Create the room if necessary.  Note that we create as a type 5 room rather
 867          * than 4, which indicates that it's a personal room but we've already supplied
 868          * the namespace prefix.
 869          *
 870          * In the unlikely event that usernums[1] is zero, a room with an invalid namespace
 871          * prefix will be created.  That's ok because the auto-purger will clean it up later.
 872          */
 873         snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[1], PAGELOGROOM);
 874         CtdlCreateRoom(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 875         msgnum = CtdlSubmitMsg(msg, NULL, roomname, 0);
 876         CtdlFreeMessage(msg);
 877
 878         /* If there is a valid user number in usernums[0], save a copy for them too. */
 879         if (im->usernums[0] > 0) {
 880                 snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[0], PAGELOGROOM);
 881                 CtdlCreateRoom(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 882                 CtdlSaveMsgPointerInRoom(roomname, msgnum, 0, NULL);
 883         }
 884
 885         /* Finally, if we're logging instant messages globally, do that now. */
 886         if (!IsEmptyStr(config.c_logpages)) {
 887                 CtdlCreateRoom(config.c_logpages, 3, "", 0, 1, 1, VIEW_BBS);
 888                 CtdlSaveMsgPointerInRoom(config.c_logpages, msgnum, 0, NULL);
 889         }
 890
 891 }
 892
 893 /*
 894  * Locate instant message conversations which have gone idle
 895  * (or, if the server is shutting down, locate *all* conversations)
 896  * and flush them to disk (in the participants' log rooms, etc.)
 897  */
 898 void flush_conversations_to_disk(time_t if_older_than) {
 899
 900         struct imlog *flush_these = NULL;
 901         struct imlog *dont_flush_these = NULL;
 902         struct imlog *imptr = NULL;
 903
 904         begin_critical_section(S_IM_LOGS);
 905         while (imlist)
 906         {
 907                 imptr = imlist;
 908                 imlist = imlist->next;
 909                 if ((time(NULL) - imptr->lastmsg) > if_older_than)
 910                 {
 911                         /* This conversation qualifies.  Move it to the list of ones to flush. */
 912                         imptr->next = flush_these;
 913                         flush_these = imptr;
 914                 }
 915                 else  {
 916                         /* Move it to the list of ones not to flush. */
 917                         imptr->next = dont_flush_these;
 918                         dont_flush_these = imptr;
 919                 }
 920         }
 921         imlist = dont_flush_these;
 922         end_critical_section(S_IM_LOGS);
 923
 924         /* We are now outside of the critical section, and we are the only thread holding a
 925          * pointer to a linked list of conversations to be flushed to disk.
 926          */
 927         while (flush_these) {
 928
 929                 flush_individual_conversation(flush_these);     /* This will free the string buffer */
 930                 imptr = flush_these;
 931                 flush_these = flush_these->next;
 932                 free(imptr);
 933         }
 934 }
 935
 936
 937
 938 void chat_timer(void) {
 939         flush_conversations_to_disk(300);       /* Anything that hasn't peeped in more than 5 minutes */
 940 }
 941
 942 void chat_shutdown(void) {
 943         flush_conversations_to_disk(0);         /* Get it ALL onto disk NOW. */
 944 }
 945
 946 CTDL_MODULE_INIT(chat)
 947 {
 948         if (!threading)
 949         {
 950                 CtdlRegisterProtoHook(cmd_chat, "CHAT", "Begin real-time chat");
 951                 CtdlRegisterProtoHook(cmd_gexp, "GEXP", "Get instant messages");
 952                 CtdlRegisterProtoHook(cmd_sexp, "SEXP", "Send an instant message");
 953                 CtdlRegisterProtoHook(cmd_dexp, "DEXP", "Disable instant messages");
 954                 CtdlRegisterProtoHook(cmd_reqt, "REQT", "Request client termination");
 955                 CtdlRegisterSessionHook(cmd_gexp_async, EVT_ASYNC);
 956                 CtdlRegisterSessionHook(delete_instant_messages, EVT_STOP);
 957                 CtdlRegisterXmsgHook(send_instant_message, XMSG_PRI_LOCAL);
 958                 CtdlRegisterSessionHook(chat_timer, EVT_TIMER);
 959                 CtdlRegisterSessionHook(chat_shutdown, EVT_SHUTDOWN);
 960         }
 961
 962         /* return our Subversion id for the Log */
 963         return "$Id$";
 964 }