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                 StrBufAppendBufPlain(this_im->conversation,
 107                         "Content-type: text/html\r\n"
 108                         "Content-transfer-encoding: 7bit\r\n\r\n"
 109                         "<html><head><title>instant message transcript</title></head>\r\n"
 110                         "<body>\r\n",
 111                         -1, 0);
 112         }
 113
 114         this_im->lastmsg = time(NULL);          /* Touch the timestamp so we know when to flush */
 115         StrBufAppendBufPlain(this_im->conversation, "<p><b>", -1, 0);
 116         StrBufAppendBufPlain(this_im->conversation, me->user.fullname, -1, 0);
 117         StrBufAppendBufPlain(this_im->conversation, ":</b> ", -1, 0);
 118         StrEscAppend(this_im->conversation, NULL, msgtext, 0, 0);
 119         StrBufAppendBufPlain(this_im->conversation, "</p>\r\n", -1, 0);
 120         end_critical_section(S_IM_LOGS);
 121 }
 122
 123 /*
 124  * This message can be set to anything you want, but it is
 125  * checked for consistency so don't move it away from here.
 126  */
 127 #define KICKEDMSG "You have been kicked out of this room."
 128
 129 void allwrite(char *cmdbuf, int flag, char *username)
 130 {
 131         FILE *fp;
 132         char bcast[SIZ];
 133         char *un;
 134         struct ChatLine *clptr, *clnew;
 135         time_t now;
 136
 137         if (CC->fake_username[0])
 138                 un = CC->fake_username;
 139         else
 140                 un = CC->user.fullname;
 141         if (flag == 1) {
 142                 snprintf(bcast, sizeof bcast, ":|<%s %s>", un, cmdbuf);
 143         } else if (flag == 0) {
 144                 snprintf(bcast, sizeof bcast, "%s|%s", un, cmdbuf);
 145         } else if (flag == 2) {
 146                 snprintf(bcast, sizeof bcast, ":|<%s whispers %s>", un, cmdbuf);
 147         } else if (flag == 3) {
 148                 snprintf(bcast, sizeof bcast, ":|%s", KICKEDMSG);
 149         }
 150         if ((strcasecmp(cmdbuf, "NOOP")) && (flag != 2)) {
 151                 fp = fopen(CHATLOG, "a");
 152                 if (fp != NULL)
 153                         fprintf(fp, "%s\n", bcast);
 154                 fclose(fp);
 155         }
 156         clnew = (struct ChatLine *) malloc(sizeof(struct ChatLine));
 157         memset(clnew, 0, sizeof(struct ChatLine));
 158         if (clnew == NULL) {
 159                 fprintf(stderr, "citserver: cannot alloc chat line: %s\n",
 160                         strerror(errno));
 161                 return;
 162         }
 163         time(&now);
 164         clnew->next = NULL;
 165         clnew->chat_time = now;
 166         safestrncpy(clnew->chat_room, CC->room.QRname,
 167                         sizeof clnew->chat_room);
 168         clnew->chat_room[sizeof clnew->chat_room - 1] = 0;
 169         if (username) {
 170                 safestrncpy(clnew->chat_username, username,
 171                         sizeof clnew->chat_username);
 172                 clnew->chat_username[sizeof clnew->chat_username - 1] = 0;
 173         } else
 174                 clnew->chat_username[0] = '\0';
 175         safestrncpy(clnew->chat_text, bcast, sizeof clnew->chat_text);
 176
 177         /* Here's the critical section.
 178          * First, add the new message to the queue...
 179          */
 180         begin_critical_section(S_CHATQUEUE);
 181         ++ChatLastMsg;
 182         clnew->chat_seq = ChatLastMsg;
 183         if (ChatQueue == NULL) {
 184                 ChatQueue = clnew;
 185         } else {
 186                 for (clptr = ChatQueue; clptr->next != NULL; clptr = clptr->next);;
 187                 clptr->next = clnew;
 188         }
 189
 190         /* Then, before releasing the lock, free the expired messages */
 191         while ((ChatQueue != NULL) && (now - ChatQueue->chat_time >= 120L)) {
 192                 clptr = ChatQueue;
 193                 ChatQueue = ChatQueue->next;
 194                 free(clptr);
 195         }
 196         end_critical_section(S_CHATQUEUE);
 197 }
 198
 199
 200 t_context *find_context(char **unstr)
 201 {
 202         t_context *t_cc, *found_cc = NULL;
 203         char *name, *tptr;
 204
 205         if ((!*unstr) || (!unstr))
 206                 return (NULL);
 207
 208         begin_critical_section(S_SESSION_TABLE);
 209         for (t_cc = ContextList; ((t_cc) && (!found_cc)); t_cc = t_cc->next) {
 210                 if (t_cc->fake_username[0])
 211                         name = t_cc->fake_username;
 212                 else
 213                         name = t_cc->curr_user;
 214                 tptr = *unstr;
 215                 if ((!strncasecmp(name, tptr, strlen(name))) && (tptr[strlen(name)] == ' ')) {
 216                         found_cc = t_cc;
 217                         *unstr = &(tptr[strlen(name) + 1]);
 218                 }
 219         }
 220         end_critical_section(S_SESSION_TABLE);
 221
 222         return (found_cc);
 223 }
 224
 225 /*
 226  * List users in chat.
 227  * allflag ==   0 = list users in chat
 228  *              1 = list users in chat, followed by users not in chat
 229  *              2 = display count only
 230  */
 231
 232 void do_chat_listing(int allflag)
 233 {
 234         struct CitContext *ccptr;
 235         int count = 0;
 236         int count_elsewhere = 0;
 237         char roomname[ROOMNAMELEN];
 238
 239         if ((allflag == 0) || (allflag == 1))
 240                 cprintf(":|\n:| Users currently in chat:\n");
 241         begin_critical_section(S_SESSION_TABLE);
 242         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 243                 if (ccptr->cs_flags & CS_CHAT) {
 244                         if (!strcasecmp(ccptr->room.QRname,
 245                            CC->room.QRname)) {
 246                                 ++count;
 247                         }
 248                         else {
 249                                 ++count_elsewhere;
 250                         }
 251                 }
 252
 253                 GenerateRoomDisplay(roomname, ccptr, CC);
 254                 if ((CC->user.axlevel < 6)
 255                    && (!IsEmptyStr(ccptr->fake_roomname))) {
 256                         strcpy(roomname, ccptr->fake_roomname);
 257                 }
 258
 259                 if ((ccptr->cs_flags & CS_CHAT)
 260                     && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 261                         if ((allflag == 0) || (allflag == 1)) {
 262                                 cprintf(":| %-25s <%s>:\n",
 263                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 264                                         roomname);
 265                         }
 266                 }
 267         }
 268
 269         if (allflag == 1) {
 270                 cprintf(":|\n:| Users not in chat:\n");
 271                 for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 272
 273                         GenerateRoomDisplay(roomname, ccptr, CC);
 274                         if ((CC->user.axlevel < 6)
 275                         && (!IsEmptyStr(ccptr->fake_roomname))) {
 276                                 strcpy(roomname, ccptr->fake_roomname);
 277                         }
 278
 279                         if (((ccptr->cs_flags & CS_CHAT) == 0)
 280                             && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 281                                 cprintf(":| %-25s <%s>:\n",
 282                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 283                                         roomname);
 284                         }
 285                 }
 286         }
 287         end_critical_section(S_SESSION_TABLE);
 288
 289         if (allflag == 2) {
 290                 if (count > 1) {
 291                         cprintf(":|There are %d users here.\n", count);
 292                 }
 293                 else {
 294                         cprintf(":|Note: you are the only one here.\n");
 295                 }
 296                 if (count_elsewhere > 0) {
 297                         cprintf(":|There are %d users chatting in other rooms.\n", count_elsewhere);
 298                 }
 299         }
 300
 301         cprintf(":|\n");
 302 }
 303
 304
 305 void cmd_chat(char *argbuf)
 306 {
 307         char cmdbuf[SIZ];
 308         char *un;
 309         char *strptr1;
 310         int MyLastMsg, ThisLastMsg;
 311         struct ChatLine *clptr;
 312         struct CitContext *t_context;
 313         int retval;
 314
 315         if (!(CC->logged_in)) {
 316                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 317                 return;
 318         }
 319
 320         CC->cs_flags = CC->cs_flags | CS_CHAT;
 321         cprintf("%d Entering chat mode (type '/help' for available commands)\n",
 322                 START_CHAT_MODE);
 323         unbuffer_output();
 324
 325         MyLastMsg = ChatLastMsg;
 326
 327         if ((CC->cs_flags & CS_STEALTH) == 0) {
 328                 allwrite("<entering chat>", 0, NULL);
 329         }
 330         strcpy(cmdbuf, "");
 331
 332         do_chat_listing(2);
 333
 334         while (1) {
 335                 int ok_cmd;
 336                 int linelen;
 337
 338                 ok_cmd = 0;
 339                 linelen = strlen(cmdbuf);
 340                 if (linelen > 100) --linelen;   /* truncate too-long lines */
 341                 cmdbuf[linelen + 1] = 0;
 342
 343                 retval = client_read_to(&cmdbuf[linelen], 1, 2);
 344
 345                 if (retval < 0 || CC->kill_me) {        /* socket broken? */
 346                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 347                                 allwrite("<disconnected>", 0, NULL);
 348                         }
 349                         return;
 350                 }
 351
 352                 /* if we have a complete line, do send processing */
 353                 if (!IsEmptyStr(cmdbuf))
 354                         if (cmdbuf[strlen(cmdbuf) - 1] == 10) {
 355                                 cmdbuf[strlen(cmdbuf) - 1] = 0;
 356                                 time(&CC->lastcmd);
 357                                 time(&CC->lastidle);
 358
 359                                 if ((!strcasecmp(cmdbuf, "exit"))
 360                                     || (!strcasecmp(cmdbuf, "/exit"))
 361                                     || (!strcasecmp(cmdbuf, "quit"))
 362                                     || (!strcasecmp(cmdbuf, "logout"))
 363                                     || (!strcasecmp(cmdbuf, "logoff"))
 364                                     || (!strcasecmp(cmdbuf, "/q"))
 365                                     || (!strcasecmp(cmdbuf, ".q"))
 366                                     || (!strcasecmp(cmdbuf, "/quit"))
 367                                     )
 368                                         strcpy(cmdbuf, "000");
 369
 370                                 if (!strcmp(cmdbuf, "000")) {
 371                                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 372                                                 allwrite("<exiting chat>", 0, NULL);
 373                                         }
 374                                         sleep(1);
 375                                         cprintf("000\n");
 376                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 377                                         return;
 378                                 }
 379                                 if ((!strcasecmp(cmdbuf, "/help"))
 380                                     || (!strcasecmp(cmdbuf, "help"))
 381                                     || (!strcasecmp(cmdbuf, "/?"))
 382                                     || (!strcasecmp(cmdbuf, "?"))) {
 383                                         cprintf(":|\n");
 384                                         cprintf(":|Available commands: \n");
 385                                         cprintf(":|/help   (prints this message) \n");
 386                                         cprintf(":|/who    (list users currently in chat) \n");
 387                                         cprintf(":|/whobbs (list users in chat -and- elsewhere) \n");
 388                                         cprintf(":|/me     ('action' line, ala irc) \n");
 389                                         cprintf(":|/msg    (send private message, ala irc) \n");
 390                                         if (is_room_aide()) {
 391                                                 cprintf(":|/kick   (kick another user out of this room) \n");
 392                                         }
 393                                         cprintf(":|/quit   (exit from this chat) \n");
 394                                         cprintf(":|\n");
 395                                         ok_cmd = 1;
 396                                 }
 397                                 if (!strcasecmp(cmdbuf, "/who")) {
 398                                         do_chat_listing(0);
 399                                         ok_cmd = 1;
 400                                 }
 401                                 if (!strcasecmp(cmdbuf, "/whobbs")) {
 402                                         do_chat_listing(1);
 403                                         ok_cmd = 1;
 404                                 }
 405                                 if (!strncasecmp(cmdbuf, "/me ", 4)) {
 406                                         allwrite(&cmdbuf[4], 1, NULL);
 407                                         ok_cmd = 1;
 408                                 }
 409                                 if (!strncasecmp(cmdbuf, "/msg ", 5)) {
 410                                         ok_cmd = 1;
 411                                         strptr1 = &cmdbuf[5];
 412                                         if ((t_context = find_context(&strptr1))) {
 413                                                 allwrite(strptr1, 2, CC->curr_user);
 414                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 415                                                         allwrite(strptr1, 2, t_context->curr_user);
 416                                         } else
 417                                                 cprintf(":|User not found.\n");
 418                                         cprintf("\n");
 419                                 }
 420                                 /* The /kick function is implemented by sending a specific
 421                                  * message to the kicked-out user's context.  When that message
 422                                  * is processed by the read loop, that context will exit.
 423                                  */
 424                                 if ( (!strncasecmp(cmdbuf, "/kick ", 6)) && (is_room_aide()) ) {
 425                                         ok_cmd = 1;
 426                                         strptr1 = &cmdbuf[6];
 427                                         strcat(strptr1, " ");
 428                                         if ((t_context = find_context(&strptr1))) {
 429                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 430                                                         allwrite(strptr1, 3, t_context->curr_user);
 431                                         } else
 432                                                 cprintf(":|User not found.\n");
 433                                         cprintf("\n");
 434                                 }
 435                                 if ((cmdbuf[0] != '/') && (strlen(cmdbuf) > 0)) {
 436                                         ok_cmd = 1;
 437                                         allwrite(cmdbuf, 0, NULL);
 438                                 }
 439                                 if ((!ok_cmd) && (cmdbuf[0]) && (cmdbuf[0] != '\n'))
 440                                         cprintf(":|Command %s is not understood.\n", cmdbuf);
 441
 442                                 strcpy(cmdbuf, "");
 443
 444                         }
 445                 /* now check the queue for new incoming stuff */
 446
 447                 if (CC->fake_username[0])
 448                         un = CC->fake_username;
 449                 else
 450                         un = CC->curr_user;
 451                 if (ChatLastMsg > MyLastMsg) {
 452                         ThisLastMsg = ChatLastMsg;
 453                         for (clptr = ChatQueue; clptr != NULL; clptr = clptr->next) {
 454                                 if ((clptr->chat_seq > MyLastMsg) && ((!clptr->chat_username[0]) || (!strncasecmp(un, clptr->chat_username, 32)))) {
 455                                         if ((!clptr->chat_room[0]) || (!strncasecmp(CC->room.QRname, clptr->chat_room, ROOMNAMELEN))) {
 456                                                 /* Output new chat data */
 457                                                 cprintf("%s\n", clptr->chat_text);
 458
 459                                                 /* See if we've been force-quitted (kicked etc.) */
 460                                                 if (!strcmp(&clptr->chat_text[2], KICKEDMSG)) {
 461                                                         allwrite("<kicked out of this room>", 0, NULL);
 462                                                         cprintf("000\n");
 463                                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 464
 465                                                         /* Kick user out of room */
 466                                                         CtdlInvtKick(CC->user.fullname, 0);
 467
 468                                                         /* And return to the Lobby */
 469                                                         usergoto(config.c_baseroom, 0, 0, NULL, NULL);
 470                                                         return;
 471                                                 }
 472                                         }
 473                                 }
 474                         }
 475                         MyLastMsg = ThisLastMsg;
 476                 }
 477         }
 478 }
 479
 480
 481
 482 /*
 483  * Delete any remaining instant messages
 484  */
 485 void delete_instant_messages(void) {
 486         struct ExpressMessage *ptr;
 487
 488         begin_critical_section(S_SESSION_TABLE);
 489         while (CC->FirstExpressMessage != NULL) {
 490                 ptr = CC->FirstExpressMessage->next;
 491                 if (CC->FirstExpressMessage->text != NULL)
 492                         free(CC->FirstExpressMessage->text);
 493                 free(CC->FirstExpressMessage);
 494                 CC->FirstExpressMessage = ptr;
 495         }
 496         end_critical_section(S_SESSION_TABLE);
 497 }
 498
 499
 500
 501
 502 /*
 503  * Poll for instant messages (OLD METHOD -- ***DEPRECATED ***)
 504  */
 505 void cmd_pexp(char *argbuf)
 506 {
 507         struct ExpressMessage *ptr, *holdptr;
 508
 509         if (CC->FirstExpressMessage == NULL) {
 510                 cprintf("%d No instant messages waiting.\n", ERROR + MESSAGE_NOT_FOUND);
 511                 return;
 512         }
 513         begin_critical_section(S_SESSION_TABLE);
 514         ptr = CC->FirstExpressMessage;
 515         CC->FirstExpressMessage = NULL;
 516         end_critical_section(S_SESSION_TABLE);
 517
 518         cprintf("%d Express msgs:\n", LISTING_FOLLOWS);
 519         while (ptr != NULL) {
 520                 if (ptr->flags && EM_BROADCAST)
 521                         cprintf("Broadcast message ");
 522                 else if (ptr->flags && EM_CHAT)
 523                         cprintf("Chat request ");
 524                 else if (ptr->flags && EM_GO_AWAY)
 525                         cprintf("Please logoff now, as requested ");
 526                 else
 527                         cprintf("Message ");
 528                 cprintf("from %s:\n", ptr->sender);
 529                 if (ptr->text != NULL)
 530                         memfmout(ptr->text, 0, "\n");
 531
 532                 holdptr = ptr->next;
 533                 if (ptr->text != NULL) free(ptr->text);
 534                 free(ptr);
 535                 ptr = holdptr;
 536         }
 537         cprintf("000\n");
 538 }
 539
 540
 541 /*
 542  * Get instant messages (new method)
 543  */
 544 void cmd_gexp(char *argbuf) {
 545         struct ExpressMessage *ptr;
 546
 547         if (CC->FirstExpressMessage == NULL) {
 548                 cprintf("%d No instant messages waiting.\n", ERROR + MESSAGE_NOT_FOUND);
 549                 return;
 550         }
 551
 552         begin_critical_section(S_SESSION_TABLE);
 553         ptr = CC->FirstExpressMessage;
 554         CC->FirstExpressMessage = CC->FirstExpressMessage->next;
 555         end_critical_section(S_SESSION_TABLE);
 556
 557         cprintf("%d %d|%ld|%d|%s|%s|%s\n",
 558                 LISTING_FOLLOWS,
 559                 ((ptr->next != NULL) ? 1 : 0),          /* more msgs? */
 560                 (long)ptr->timestamp,                   /* time sent */
 561                 ptr->flags,                             /* flags */
 562                 ptr->sender,                            /* sender of msg */
 563                 config.c_nodename,                      /* static for now (and possibly deprecated) */
 564                 ptr->sender_email                       /* email or jid of sender */
 565         );
 566
 567         if (ptr->text != NULL) {
 568                 memfmout(ptr->text, 0, "\n");
 569                 if (ptr->text[strlen(ptr->text)-1] != '\n') cprintf("\n");
 570                 free(ptr->text);
 571         }
 572
 573         cprintf("000\n");
 574         free(ptr);
 575 }
 576
 577 /*
 578  * Asynchronously deliver instant messages
 579  */
 580 void cmd_gexp_async(void) {
 581
 582         /* Only do this if the session can handle asynchronous protocol */
 583         if (CC->is_async == 0) return;
 584
 585         /* And don't do it if there's nothing to send. */
 586         if (CC->FirstExpressMessage == NULL) return;
 587
 588         cprintf("%d instant msg\n", ASYNC_MSG + ASYNC_GEXP);
 589 }
 590
 591 /*
 592  * Back end support function for send_instant_message() and company
 593  */
 594 void add_xmsg_to_context(struct CitContext *ccptr, struct ExpressMessage *newmsg)
 595 {
 596         struct ExpressMessage *findend;
 597
 598         if (ccptr->FirstExpressMessage == NULL) {
 599                 ccptr->FirstExpressMessage = newmsg;
 600         }
 601         else {
 602                 findend = ccptr->FirstExpressMessage;
 603                 while (findend->next != NULL) {
 604                         findend = findend->next;
 605                 }
 606                 findend->next = newmsg;
 607         }
 608
 609         /* If the target context is a session which can handle asynchronous
 610          * messages, go ahead and set the flag for that.
 611          */
 612         if (ccptr->is_async) {
 613                 ccptr->async_waiting = 1;
 614                 if (ccptr->state == CON_IDLE) {
 615                         ccptr->state = CON_READY;
 616                 }
 617         }
 618 }
 619
 620
 621
 622
 623 /*
 624  * This is the back end to the instant message sending function.
 625  * Returns the number of users to which the message was sent.
 626  * Sending a zero-length message tests for recipients without sending messages.
 627  */
 628 int send_instant_message(char *lun, char *lem, char *x_user, char *x_msg)
 629 {
 630         int message_sent = 0;           /* number of successful sends */
 631         struct CitContext *ccptr;
 632         struct ExpressMessage *newmsg = NULL;
 633         char *un;
 634         size_t msglen = 0;
 635         int do_send = 0;                /* 1 = send message; 0 = only check for valid recipient */
 636
 637         if (strlen(x_msg) > 0) {
 638                 msglen = strlen(x_msg) + 4;
 639                 do_send = 1;
 640         }
 641
 642         /* find the target user's context and append the message */
 643         begin_critical_section(S_SESSION_TABLE);
 644         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 645
 646                 if (ccptr->fake_username[0]) {
 647                         un = ccptr->fake_username;
 648                 }
 649                 else {
 650                         un = ccptr->user.fullname;
 651                 }
 652
 653                 if ( ((!strcasecmp(un, x_user))
 654                     || (!strcasecmp(x_user, "broadcast")))
 655                     && (ccptr->can_receive_im)
 656                     && ((ccptr->disable_exp == 0)
 657                     || (CC->user.axlevel >= 6)) ) {
 658                         if (do_send) {
 659                                 newmsg = (struct ExpressMessage *)
 660                                         malloc(sizeof (struct ExpressMessage));
 661                                 memset(newmsg, 0,
 662                                         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);
 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 < 6)) {
 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 (getuser(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 (getuser(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,
 842                 "</body>\r\n"
 843                 "</html>\r\n",
 844                 -1, 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         msg->cm_fields['A'] = strdup("Citadel");
 853         msg->cm_fields['O'] = strdup(PAGELOGROOM);
 854         msg->cm_fields['N'] = strdup(NODENAME);
 855         msg->cm_fields['M'] = strdup(ChrPtr(im->conversation));
 856
 857         /* Start with usernums[1] because it's guaranteed to be higher than usernums[0],
 858          * so if there's only one party, usernums[0] will be zero but usernums[1] won't.
 859          * Create the room if necessary.  Note that we create as a type 5 room rather
 860          * than 4, which indicates that it's a personal room but we've already supplied
 861          * the namespace prefix.
 862          *
 863          * In the unlikely event that usernums[1] is zero, a room with an invalid namespace
 864          * prefix will be created.  That's ok because the auto-purger will clean it up later.
 865          */
 866         snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[1], PAGELOGROOM);
 867         create_room(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 868         msgnum = CtdlSubmitMsg(msg, NULL, roomname, 0);
 869         CtdlFreeMessage(msg);
 870
 871         /* If there is a valid user number in usernums[0], save a copy for them too. */
 872         if (im->usernums[0] > 0) {
 873                 snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[0], PAGELOGROOM);
 874                 create_room(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 875                 CtdlSaveMsgPointerInRoom(roomname, msgnum, 0, NULL);
 876         }
 877
 878         /* Finally, if we're logging instant messages globally, do that now. */
 879         if (!IsEmptyStr(config.c_logpages)) {
 880                 create_room(config.c_logpages, 3, "", 0, 1, 1, VIEW_BBS);
 881                 CtdlSaveMsgPointerInRoom(config.c_logpages, msgnum, 0, NULL);
 882         }
 883
 884 }
 885
 886 /*
 887  * Locate instant message conversations which have gone idle
 888  * (or, if the server is shutting down, locate *all* conversations)
 889  * and flush them to disk (in the participants' log rooms, etc.)
 890  */
 891 void flush_conversations_to_disk(time_t if_older_than) {
 892
 893         struct imlog *flush_these = NULL;
 894         struct imlog *dont_flush_these = NULL;
 895         struct imlog *imptr = NULL;
 896
 897         begin_critical_section(S_IM_LOGS);
 898         while (imlist)
 899         {
 900                 imptr = imlist;
 901                 imlist = imlist->next;
 902                 if ((time(NULL) - imptr->lastmsg) > if_older_than)
 903                 {
 904                         /* This conversation qualifies.  Move it to the list of ones to flush. */
 905                         imptr->next = flush_these;
 906                         flush_these = imptr;
 907                 }
 908                 else  {
 909                         /* Move it to the list of ones not to flush. */
 910                         imptr->next = dont_flush_these;
 911                         dont_flush_these = imptr;
 912                 }
 913         }
 914         imlist = dont_flush_these;
 915         end_critical_section(S_IM_LOGS);
 916
 917         /* We are now outside of the critical section, and we are the only thread holding a
 918          * pointer to a linked list of conversations to be flushed to disk.
 919          */
 920         while (flush_these) {
 921
 922                 flush_individual_conversation(flush_these);
 923                 imptr = flush_these;
 924                 flush_these = flush_these->next;
 925                 FreeStrBuf(&imptr->conversation);
 926                 free(imptr);
 927         }
 928 }
 929
 930
 931
 932 void chat_timer(void) {
 933         flush_conversations_to_disk(300);       /* Anything that hasn't peeped in more than 5 minutes */
 934 }
 935
 936 void chat_shutdown(void) {
 937         flush_conversations_to_disk(0);         /* Get it ALL onto disk NOW. */
 938 }
 939
 940 CTDL_MODULE_INIT(chat)
 941 {
 942         if (!threading)
 943         {
 944                 CtdlRegisterProtoHook(cmd_chat, "CHAT", "Begin real-time chat");
 945                 CtdlRegisterProtoHook(cmd_pexp, "PEXP", "Poll for instant messages");
 946                 CtdlRegisterProtoHook(cmd_gexp, "GEXP", "Get instant messages");
 947                 CtdlRegisterProtoHook(cmd_sexp, "SEXP", "Send an instant message");
 948                 CtdlRegisterProtoHook(cmd_dexp, "DEXP", "Disable instant messages");
 949                 CtdlRegisterProtoHook(cmd_reqt, "REQT", "Request client termination");
 950                 CtdlRegisterSessionHook(cmd_gexp_async, EVT_ASYNC);
 951                 CtdlRegisterSessionHook(delete_instant_messages, EVT_STOP);
 952                 CtdlRegisterXmsgHook(send_instant_message, XMSG_PRI_LOCAL);
 953                 CtdlRegisterSessionHook(chat_timer, EVT_TIMER);
 954                 CtdlRegisterSessionHook(chat_shutdown, EVT_SHUTDOWN);
 955         }
 956
 957         /* return our Subversion id for the Log */
 958         return "$Id$";
 959 }