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,
 115                         "Content-type: text/html\r\n"
 116                         "Content-transfer-encoding: 7bit\r\n\r\n"
 117                         "<html><head><title>instant message transcript</title></head>\r\n"
 118                         "<body>\r\n",
 119                         -1, 0);
 120         }
 121
 122         this_im->lastmsg = time(NULL);          /* Touch the timestamp so we know when to flush */
 123         StrBufAppendBufPlain(this_im->conversation, "<p><b>", -1, 0);
 124         StrBufAppendBufPlain(this_im->conversation, me->user.fullname, -1, 0);
 125         StrBufAppendBufPlain(this_im->conversation, ":</b> ", -1, 0);
 126         StrEscAppend(this_im->conversation, NULL, msgtext, 0, 0);
 127         StrBufAppendBufPlain(this_im->conversation, "</p>\r\n", -1, 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)
 263                    && (!IsEmptyStr(ccptr->fake_roomname))) {
 264                         strcpy(roomname, ccptr->fake_roomname);
 265                 }
 266
 267                 if ((ccptr->cs_flags & CS_CHAT)
 268                     && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 269                         if ((allflag == 0) || (allflag == 1)) {
 270                                 cprintf(":| %-25s <%s>:\n",
 271                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 272                                         roomname);
 273                         }
 274                 }
 275         }
 276
 277         if (allflag == 1) {
 278                 cprintf(":|\n:| Users not in chat:\n");
 279                 for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 280
 281                         GenerateRoomDisplay(roomname, ccptr, CC);
 282                         if ((CC->user.axlevel < 6)
 283                         && (!IsEmptyStr(ccptr->fake_roomname))) {
 284                                 strcpy(roomname, ccptr->fake_roomname);
 285                         }
 286
 287                         if (((ccptr->cs_flags & CS_CHAT) == 0)
 288                             && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 289                                 cprintf(":| %-25s <%s>:\n",
 290                                         (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user,
 291                                         roomname);
 292                         }
 293                 }
 294         }
 295         end_critical_section(S_SESSION_TABLE);
 296
 297         if (allflag == 2) {
 298                 if (count > 1) {
 299                         cprintf(":|There are %d users here.\n", count);
 300                 }
 301                 else {
 302                         cprintf(":|Note: you are the only one here.\n");
 303                 }
 304                 if (count_elsewhere > 0) {
 305                         cprintf(":|There are %d users chatting in other rooms.\n", count_elsewhere);
 306                 }
 307         }
 308
 309         cprintf(":|\n");
 310 }
 311
 312
 313 void cmd_chat(char *argbuf)
 314 {
 315         char cmdbuf[SIZ];
 316         char *un;
 317         char *strptr1;
 318         int MyLastMsg, ThisLastMsg;
 319         struct ChatLine *clptr;
 320         struct CitContext *t_context;
 321         int retval;
 322
 323         if (!(CC->logged_in)) {
 324                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 325                 return;
 326         }
 327
 328         CC->cs_flags = CC->cs_flags | CS_CHAT;
 329         cprintf("%d Entering chat mode (type '/help' for available commands)\n",
 330                 START_CHAT_MODE);
 331         unbuffer_output();
 332
 333         MyLastMsg = ChatLastMsg;
 334
 335         if ((CC->cs_flags & CS_STEALTH) == 0) {
 336                 allwrite("<entering chat>", 0, NULL);
 337         }
 338         strcpy(cmdbuf, "");
 339
 340         do_chat_listing(2);
 341
 342         while (1) {
 343                 int ok_cmd;
 344                 int linelen;
 345
 346                 ok_cmd = 0;
 347                 linelen = strlen(cmdbuf);
 348                 if (linelen > 100) --linelen;   /* truncate too-long lines */
 349                 cmdbuf[linelen + 1] = 0;
 350
 351                 retval = client_read_to(&cmdbuf[linelen], 1, 2);
 352
 353                 if (retval < 0 || CC->kill_me) {        /* socket broken? */
 354                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 355                                 allwrite("<disconnected>", 0, NULL);
 356                         }
 357                         return;
 358                 }
 359
 360                 /* if we have a complete line, do send processing */
 361                 if (!IsEmptyStr(cmdbuf))
 362                         if (cmdbuf[strlen(cmdbuf) - 1] == 10) {
 363                                 cmdbuf[strlen(cmdbuf) - 1] = 0;
 364                                 time(&CC->lastcmd);
 365                                 time(&CC->lastidle);
 366
 367                                 if ((!strcasecmp(cmdbuf, "exit"))
 368                                     || (!strcasecmp(cmdbuf, "/exit"))
 369                                     || (!strcasecmp(cmdbuf, "quit"))
 370                                     || (!strcasecmp(cmdbuf, "logout"))
 371                                     || (!strcasecmp(cmdbuf, "logoff"))
 372                                     || (!strcasecmp(cmdbuf, "/q"))
 373                                     || (!strcasecmp(cmdbuf, ".q"))
 374                                     || (!strcasecmp(cmdbuf, "/quit"))
 375                                     )
 376                                         strcpy(cmdbuf, "000");
 377
 378                                 if (!strcmp(cmdbuf, "000")) {
 379                                         if ((CC->cs_flags & CS_STEALTH) == 0) {
 380                                                 allwrite("<exiting chat>", 0, NULL);
 381                                         }
 382                                         sleep(1);
 383                                         cprintf("000\n");
 384                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 385                                         return;
 386                                 }
 387                                 if ((!strcasecmp(cmdbuf, "/help"))
 388                                     || (!strcasecmp(cmdbuf, "help"))
 389                                     || (!strcasecmp(cmdbuf, "/?"))
 390                                     || (!strcasecmp(cmdbuf, "?"))) {
 391                                         cprintf(":|\n");
 392                                         cprintf(":|Available commands: \n");
 393                                         cprintf(":|/help   (prints this message) \n");
 394                                         cprintf(":|/who    (list users currently in chat) \n");
 395                                         cprintf(":|/whobbs (list users in chat -and- elsewhere) \n");
 396                                         cprintf(":|/me     ('action' line, ala irc) \n");
 397                                         cprintf(":|/msg    (send private message, ala irc) \n");
 398                                         if (is_room_aide()) {
 399                                                 cprintf(":|/kick   (kick another user out of this room) \n");
 400                                         }
 401                                         cprintf(":|/quit   (exit from this chat) \n");
 402                                         cprintf(":|\n");
 403                                         ok_cmd = 1;
 404                                 }
 405                                 if (!strcasecmp(cmdbuf, "/who")) {
 406                                         do_chat_listing(0);
 407                                         ok_cmd = 1;
 408                                 }
 409                                 if (!strcasecmp(cmdbuf, "/whobbs")) {
 410                                         do_chat_listing(1);
 411                                         ok_cmd = 1;
 412                                 }
 413                                 if (!strncasecmp(cmdbuf, "/me ", 4)) {
 414                                         allwrite(&cmdbuf[4], 1, NULL);
 415                                         ok_cmd = 1;
 416                                 }
 417                                 if (!strncasecmp(cmdbuf, "/msg ", 5)) {
 418                                         ok_cmd = 1;
 419                                         strptr1 = &cmdbuf[5];
 420                                         if ((t_context = find_context(&strptr1))) {
 421                                                 allwrite(strptr1, 2, CC->curr_user);
 422                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 423                                                         allwrite(strptr1, 2, t_context->curr_user);
 424                                         } else
 425                                                 cprintf(":|User not found.\n");
 426                                         cprintf("\n");
 427                                 }
 428                                 /* The /kick function is implemented by sending a specific
 429                                  * message to the kicked-out user's context.  When that message
 430                                  * is processed by the read loop, that context will exit.
 431                                  */
 432                                 if ( (!strncasecmp(cmdbuf, "/kick ", 6)) && (is_room_aide()) ) {
 433                                         ok_cmd = 1;
 434                                         strptr1 = &cmdbuf[6];
 435                                         strcat(strptr1, " ");
 436                                         if ((t_context = find_context(&strptr1))) {
 437                                                 if (strcasecmp(CC->curr_user, t_context->curr_user))
 438                                                         allwrite(strptr1, 3, t_context->curr_user);
 439                                         } else
 440                                                 cprintf(":|User not found.\n");
 441                                         cprintf("\n");
 442                                 }
 443                                 if ((cmdbuf[0] != '/') && (strlen(cmdbuf) > 0)) {
 444                                         ok_cmd = 1;
 445                                         allwrite(cmdbuf, 0, NULL);
 446                                 }
 447                                 if ((!ok_cmd) && (cmdbuf[0]) && (cmdbuf[0] != '\n'))
 448                                         cprintf(":|Command %s is not understood.\n", cmdbuf);
 449
 450                                 strcpy(cmdbuf, "");
 451
 452                         }
 453                 /* now check the queue for new incoming stuff */
 454
 455                 if (CC->fake_username[0])
 456                         un = CC->fake_username;
 457                 else
 458                         un = CC->curr_user;
 459                 if (ChatLastMsg > MyLastMsg) {
 460                         ThisLastMsg = ChatLastMsg;
 461                         for (clptr = ChatQueue; clptr != NULL; clptr = clptr->next) {
 462                                 if ((clptr->chat_seq > MyLastMsg) && ((!clptr->chat_username[0]) || (!strncasecmp(un, clptr->chat_username, 32)))) {
 463                                         if ((!clptr->chat_room[0]) || (!strncasecmp(CC->room.QRname, clptr->chat_room, ROOMNAMELEN))) {
 464                                                 /* Output new chat data */
 465                                                 cprintf("%s\n", clptr->chat_text);
 466
 467                                                 /* See if we've been force-quitted (kicked etc.) */
 468                                                 if (!strcmp(&clptr->chat_text[2], KICKEDMSG)) {
 469                                                         allwrite("<kicked out of this room>", 0, NULL);
 470                                                         cprintf("000\n");
 471                                                         CC->cs_flags = CC->cs_flags - CS_CHAT;
 472
 473                                                         /* Kick user out of room */
 474                                                         CtdlInvtKick(CC->user.fullname, 0);
 475
 476                                                         /* And return to the Lobby */
 477                                                         usergoto(config.c_baseroom, 0, 0, NULL, NULL);
 478                                                         return;
 479                                                 }
 480                                         }
 481                                 }
 482                         }
 483                         MyLastMsg = ThisLastMsg;
 484                 }
 485         }
 486 }
 487
 488
 489
 490 /*
 491  * Delete any remaining instant messages
 492  */
 493 void delete_instant_messages(void) {
 494         struct ExpressMessage *ptr;
 495
 496         begin_critical_section(S_SESSION_TABLE);
 497         while (CC->FirstExpressMessage != NULL) {
 498                 ptr = CC->FirstExpressMessage->next;
 499                 if (CC->FirstExpressMessage->text != NULL)
 500                         free(CC->FirstExpressMessage->text);
 501                 free(CC->FirstExpressMessage);
 502                 CC->FirstExpressMessage = ptr;
 503         }
 504         end_critical_section(S_SESSION_TABLE);
 505 }
 506
 507
 508
 509
 510 /*
 511  * Poll for instant messages (OLD METHOD -- ***DEPRECATED ***)
 512  */
 513 void cmd_pexp(char *argbuf)
 514 {
 515         struct ExpressMessage *ptr, *holdptr;
 516
 517         if (CC->FirstExpressMessage == NULL) {
 518                 cprintf("%d No instant messages waiting.\n", ERROR + MESSAGE_NOT_FOUND);
 519                 return;
 520         }
 521         begin_critical_section(S_SESSION_TABLE);
 522         ptr = CC->FirstExpressMessage;
 523         CC->FirstExpressMessage = NULL;
 524         end_critical_section(S_SESSION_TABLE);
 525
 526         cprintf("%d Express msgs:\n", LISTING_FOLLOWS);
 527         while (ptr != NULL) {
 528                 if (ptr->flags && EM_BROADCAST)
 529                         cprintf("Broadcast message ");
 530                 else if (ptr->flags && EM_CHAT)
 531                         cprintf("Chat request ");
 532                 else if (ptr->flags && EM_GO_AWAY)
 533                         cprintf("Please logoff now, as requested ");
 534                 else
 535                         cprintf("Message ");
 536                 cprintf("from %s:\n", ptr->sender);
 537                 if (ptr->text != NULL)
 538                         memfmout(ptr->text, 0, "\n");
 539
 540                 holdptr = ptr->next;
 541                 if (ptr->text != NULL) free(ptr->text);
 542                 free(ptr);
 543                 ptr = holdptr;
 544         }
 545         cprintf("000\n");
 546 }
 547
 548
 549 /*
 550  * Get instant messages (new method)
 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, 0, "\n");
 577                 if (ptr->text[strlen(ptr->text)-1] != '\n') cprintf("\n");
 578                 free(ptr->text);
 579         }
 580
 581         cprintf("000\n");
 582         free(ptr);
 583 }
 584
 585 /*
 586  * Asynchronously deliver instant messages
 587  */
 588 void cmd_gexp_async(void) {
 589
 590         /* Only do this if the session can handle asynchronous protocol */
 591         if (CC->is_async == 0) return;
 592
 593         /* And don't do it if there's nothing to send. */
 594         if (CC->FirstExpressMessage == NULL) return;
 595
 596         cprintf("%d instant msg\n", ASYNC_MSG + ASYNC_GEXP);
 597 }
 598
 599 /*
 600  * Back end support function for send_instant_message() and company
 601  */
 602 void add_xmsg_to_context(struct CitContext *ccptr, struct ExpressMessage *newmsg)
 603 {
 604         struct ExpressMessage *findend;
 605
 606         if (ccptr->FirstExpressMessage == NULL) {
 607                 ccptr->FirstExpressMessage = newmsg;
 608         }
 609         else {
 610                 findend = ccptr->FirstExpressMessage;
 611                 while (findend->next != NULL) {
 612                         findend = findend->next;
 613                 }
 614                 findend->next = newmsg;
 615         }
 616
 617         /* If the target context is a session which can handle asynchronous
 618          * messages, go ahead and set the flag for that.
 619          */
 620         if (ccptr->is_async) {
 621                 ccptr->async_waiting = 1;
 622                 if (ccptr->state == CON_IDLE) {
 623                         ccptr->state = CON_READY;
 624                 }
 625         }
 626 }
 627
 628
 629
 630
 631 /*
 632  * This is the back end to the instant message sending function.
 633  * Returns the number of users to which the message was sent.
 634  * Sending a zero-length message tests for recipients without sending messages.
 635  */
 636 int send_instant_message(char *lun, char *lem, char *x_user, char *x_msg)
 637 {
 638         int message_sent = 0;           /* number of successful sends */
 639         struct CitContext *ccptr;
 640         struct ExpressMessage *newmsg = NULL;
 641         char *un;
 642         size_t msglen = 0;
 643         int do_send = 0;                /* 1 = send message; 0 = only check for valid recipient */
 644
 645         if (strlen(x_msg) > 0) {
 646                 msglen = strlen(x_msg) + 4;
 647                 do_send = 1;
 648         }
 649
 650         /* find the target user's context and append the message */
 651         begin_critical_section(S_SESSION_TABLE);
 652         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 653
 654                 if (ccptr->fake_username[0]) {
 655                         un = ccptr->fake_username;
 656                 }
 657                 else {
 658                         un = ccptr->user.fullname;
 659                 }
 660
 661                 if ( ((!strcasecmp(un, x_user))
 662                     || (!strcasecmp(x_user, "broadcast")))
 663                     && (ccptr->can_receive_im)
 664                     && ((ccptr->disable_exp == 0)
 665                     || (CC->user.axlevel >= 6)) ) {
 666                         if (do_send) {
 667                                 newmsg = (struct ExpressMessage *)
 668                                         malloc(sizeof (struct ExpressMessage));
 669                                 memset(newmsg, 0,
 670                                         sizeof (struct ExpressMessage));
 671                                 time(&(newmsg->timestamp));
 672                                 safestrncpy(newmsg->sender, lun, sizeof newmsg->sender);
 673                                 safestrncpy(newmsg->sender_email, lem, sizeof newmsg->sender_email);
 674                                 if (!strcasecmp(x_user, "broadcast")) {
 675                                         newmsg->flags |= EM_BROADCAST;
 676                                 }
 677                                 newmsg->text = strdup(x_msg);
 678
 679                                 add_xmsg_to_context(ccptr, newmsg);
 680
 681                                 /* and log it ... */
 682                                 if (ccptr != CC) {
 683                                         log_instant_message(CC, ccptr, newmsg->text);
 684                                 }
 685                         }
 686                         ++message_sent;
 687                 }
 688         }
 689         end_critical_section(S_SESSION_TABLE);
 690         return (message_sent);
 691 }
 692
 693 /*
 694  * send instant messages
 695  */
 696 void cmd_sexp(char *argbuf)
 697 {
 698         int message_sent = 0;
 699         char x_user[USERNAME_SIZE];
 700         char x_msg[1024];
 701         char *lun;
 702         char *lem;
 703         char *x_big_msgbuf = NULL;
 704
 705         if ((!(CC->logged_in)) && (!(CC->internal_pgm))) {
 706                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 707                 return;
 708         }
 709         if (CC->fake_username[0])
 710                 lun = CC->fake_username;
 711         else
 712                 lun = CC->user.fullname;
 713
 714         lem = CC->cs_inet_email;
 715
 716         extract_token(x_user, argbuf, 0, '|', sizeof x_user);
 717         extract_token(x_msg, argbuf, 1, '|', sizeof x_msg);
 718
 719         if (!x_user[0]) {
 720                 cprintf("%d You were not previously paged.\n", ERROR + NO_SUCH_USER);
 721                 return;
 722         }
 723         if ((!strcasecmp(x_user, "broadcast")) && (CC->user.axlevel < 6)) {
 724                 cprintf("%d Higher access required to send a broadcast.\n",
 725                         ERROR + HIGHER_ACCESS_REQUIRED);
 726                 return;
 727         }
 728         /* This loop handles text-transfer pages */
 729         if (!strcmp(x_msg, "-")) {
 730                 message_sent = PerformXmsgHooks(lun, lem, x_user, "");
 731                 if (message_sent == 0) {
 732                         if (getuser(NULL, x_user))
 733                                 cprintf("%d '%s' does not exist.\n",
 734                                                 ERROR + NO_SUCH_USER, x_user);
 735                         else
 736                                 cprintf("%d '%s' is not logged in "
 737                                                 "or is not accepting pages.\n",
 738                                                 ERROR + RESOURCE_NOT_OPEN, x_user);
 739                         return;
 740                 }
 741                 unbuffer_output();
 742                 cprintf("%d Transmit message (will deliver to %d users)\n",
 743                         SEND_LISTING, message_sent);
 744                 x_big_msgbuf = malloc(SIZ);
 745                 memset(x_big_msgbuf, 0, SIZ);
 746                 while (client_getln(x_msg, sizeof x_msg) >= 0 && strcmp(x_msg, "000")) {
 747                         x_big_msgbuf = realloc(x_big_msgbuf,
 748                                strlen(x_big_msgbuf) + strlen(x_msg) + 4);
 749                         if (!IsEmptyStr(x_big_msgbuf))
 750                            if (x_big_msgbuf[strlen(x_big_msgbuf)] != '\n')
 751                                 strcat(x_big_msgbuf, "\n");
 752                         strcat(x_big_msgbuf, x_msg);
 753                 }
 754                 PerformXmsgHooks(lun, lem, x_user, x_big_msgbuf);
 755                 free(x_big_msgbuf);
 756
 757                 /* This loop handles inline pages */
 758         } else {
 759                 message_sent = PerformXmsgHooks(lun, lem, x_user, x_msg);
 760
 761                 if (message_sent > 0) {
 762                         if (!IsEmptyStr(x_msg))
 763                                 cprintf("%d Message sent", CIT_OK);
 764                         else
 765                                 cprintf("%d Ok to send message", CIT_OK);
 766                         if (message_sent > 1)
 767                                 cprintf(" to %d users", message_sent);
 768                         cprintf(".\n");
 769                 } else {
 770                         if (getuser(NULL, x_user))
 771                                 cprintf("%d '%s' does not exist.\n",
 772                                                 ERROR + NO_SUCH_USER, x_user);
 773                         else
 774                                 cprintf("%d '%s' is not logged in "
 775                                                 "or is not accepting pages.\n",
 776                                                 ERROR + RESOURCE_NOT_OPEN, x_user);
 777                 }
 778
 779
 780         }
 781 }
 782
 783
 784
 785 /*
 786  * Enter or exit paging-disabled mode
 787  */
 788 void cmd_dexp(char *argbuf)
 789 {
 790         int new_state;
 791
 792         if (CtdlAccessCheck(ac_logged_in)) return;
 793
 794         new_state = extract_int(argbuf, 0);
 795         if ((new_state == 0) || (new_state == 1)) {
 796                 CC->disable_exp = new_state;
 797         }
 798
 799         cprintf("%d %d\n", CIT_OK, CC->disable_exp);
 800 }
 801
 802
 803 /*
 804  * Request client termination
 805  */
 806 void cmd_reqt(char *argbuf) {
 807         struct CitContext *ccptr;
 808         int sessions = 0;
 809         int which_session;
 810         struct ExpressMessage *newmsg;
 811
 812         if (CtdlAccessCheck(ac_aide)) return;
 813         which_session = extract_int(argbuf, 0);
 814
 815         begin_critical_section(S_SESSION_TABLE);
 816         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 817                 if ((ccptr->cs_pid == which_session) || (which_session == 0)) {
 818
 819                         newmsg = (struct ExpressMessage *)
 820                                 malloc(sizeof (struct ExpressMessage));
 821                         memset(newmsg, 0,
 822                                 sizeof (struct ExpressMessage));
 823                         time(&(newmsg->timestamp));
 824                         safestrncpy(newmsg->sender, CC->user.fullname,
 825                                     sizeof newmsg->sender);
 826                         newmsg->flags |= EM_GO_AWAY;
 827                         newmsg->text = strdup("Automatic logoff requested.");
 828
 829                         add_xmsg_to_context(ccptr, newmsg);
 830                         ++sessions;
 831
 832                 }
 833         }
 834         end_critical_section(S_SESSION_TABLE);
 835         cprintf("%d Sent termination request to %d sessions.\n", CIT_OK, sessions);
 836 }
 837
 838
 839 /*
 840  * This is the back end for flush_conversations_to_disk()
 841  * At this point we've isolated a single conversation (struct imlog)
 842  * and are ready to write it to disk.
 843  */
 844 void flush_individual_conversation(struct imlog *im) {
 845         struct CtdlMessage *msg;
 846         long msgnum = 0;
 847         char roomname[ROOMNAMELEN];
 848
 849         StrBufAppendBufPlain(im->conversation,
 850                 "</body>\r\n"
 851                 "</html>\r\n",
 852                 -1, 0
 853         );
 854
 855         msg = malloc(sizeof(struct CtdlMessage));
 856         memset(msg, 0, sizeof(struct CtdlMessage));
 857         msg->cm_magic = CTDLMESSAGE_MAGIC;
 858         msg->cm_anon_type = MES_NORMAL;
 859         msg->cm_format_type = FMT_RFC822;
 860         if (!IsEmptyStr(im->usernames[0])) {
 861                 msg->cm_fields['A'] = strdup(im->usernames[0]);
 862         } else {
 863                 msg->cm_fields['A'] = strdup("Citadel");
 864         }
 865         if (!IsEmptyStr(im->usernames[1])) {
 866                 msg->cm_fields['R'] = strdup(im->usernames[1]);
 867         }
 868         msg->cm_fields['O'] = strdup(PAGELOGROOM);
 869         msg->cm_fields['N'] = strdup(NODENAME);
 870         msg->cm_fields['M'] = strdup(ChrPtr(im->conversation));
 871
 872         /* Start with usernums[1] because it's guaranteed to be higher than usernums[0],
 873          * so if there's only one party, usernums[0] will be zero but usernums[1] won't.
 874          * Create the room if necessary.  Note that we create as a type 5 room rather
 875          * than 4, which indicates that it's a personal room but we've already supplied
 876          * the namespace prefix.
 877          *
 878          * In the unlikely event that usernums[1] is zero, a room with an invalid namespace
 879          * prefix will be created.  That's ok because the auto-purger will clean it up later.
 880          */
 881         snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[1], PAGELOGROOM);
 882         create_room(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 883         msgnum = CtdlSubmitMsg(msg, NULL, roomname, 0);
 884         CtdlFreeMessage(msg);
 885
 886         /* If there is a valid user number in usernums[0], save a copy for them too. */
 887         if (im->usernums[0] > 0) {
 888                 snprintf(roomname, sizeof roomname, "%010ld.%s", im->usernums[0], PAGELOGROOM);
 889                 create_room(roomname, 5, "", 0, 1, 1, VIEW_BBS);
 890                 CtdlSaveMsgPointerInRoom(roomname, msgnum, 0, NULL);
 891         }
 892
 893         /* Finally, if we're logging instant messages globally, do that now. */
 894         if (!IsEmptyStr(config.c_logpages)) {
 895                 create_room(config.c_logpages, 3, "", 0, 1, 1, VIEW_BBS);
 896                 CtdlSaveMsgPointerInRoom(config.c_logpages, msgnum, 0, NULL);
 897         }
 898
 899 }
 900
 901 /*
 902  * Locate instant message conversations which have gone idle
 903  * (or, if the server is shutting down, locate *all* conversations)
 904  * and flush them to disk (in the participants' log rooms, etc.)
 905  */
 906 void flush_conversations_to_disk(time_t if_older_than) {
 907
 908         struct imlog *flush_these = NULL;
 909         struct imlog *dont_flush_these = NULL;
 910         struct imlog *imptr = NULL;
 911
 912         begin_critical_section(S_IM_LOGS);
 913         while (imlist)
 914         {
 915                 imptr = imlist;
 916                 imlist = imlist->next;
 917                 if ((time(NULL) - imptr->lastmsg) > if_older_than)
 918                 {
 919                         /* This conversation qualifies.  Move it to the list of ones to flush. */
 920                         imptr->next = flush_these;
 921                         flush_these = imptr;
 922                 }
 923                 else  {
 924                         /* Move it to the list of ones not to flush. */
 925                         imptr->next = dont_flush_these;
 926                         dont_flush_these = imptr;
 927                 }
 928         }
 929         imlist = dont_flush_these;
 930         end_critical_section(S_IM_LOGS);
 931
 932         /* We are now outside of the critical section, and we are the only thread holding a
 933          * pointer to a linked list of conversations to be flushed to disk.
 934          */
 935         while (flush_these) {
 936
 937                 flush_individual_conversation(flush_these);
 938                 imptr = flush_these;
 939                 flush_these = flush_these->next;
 940                 FreeStrBuf(&imptr->conversation);
 941                 free(imptr);
 942         }
 943 }
 944
 945
 946
 947 void chat_timer(void) {
 948         flush_conversations_to_disk(300);       /* Anything that hasn't peeped in more than 5 minutes */
 949 }
 950
 951 void chat_shutdown(void) {
 952         flush_conversations_to_disk(0);         /* Get it ALL onto disk NOW. */
 953 }
 954
 955 CTDL_MODULE_INIT(chat)
 956 {
 957         if (!threading)
 958         {
 959                 CtdlRegisterProtoHook(cmd_chat, "CHAT", "Begin real-time chat");
 960                 CtdlRegisterProtoHook(cmd_pexp, "PEXP", "Poll for instant messages");
 961                 CtdlRegisterProtoHook(cmd_gexp, "GEXP", "Get instant messages");
 962                 CtdlRegisterProtoHook(cmd_sexp, "SEXP", "Send an instant message");
 963                 CtdlRegisterProtoHook(cmd_dexp, "DEXP", "Disable instant messages");
 964                 CtdlRegisterProtoHook(cmd_reqt, "REQT", "Request client termination");
 965                 CtdlRegisterSessionHook(cmd_gexp_async, EVT_ASYNC);
 966                 CtdlRegisterSessionHook(delete_instant_messages, EVT_STOP);
 967                 CtdlRegisterXmsgHook(send_instant_message, XMSG_PRI_LOCAL);
 968                 CtdlRegisterSessionHook(chat_timer, EVT_TIMER);
 969                 CtdlRegisterSessionHook(chat_shutdown, EVT_SHUTDOWN);
 970         }
 971
 972         /* return our Subversion id for the Log */
 973         return "$Id$";
 974 }