citadel/serv_chat.c

   1 /* $Id$ */
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <stdio.h>
   5 #include <fcntl.h>
   6 #include <signal.h>
   7 #include <pwd.h>
   8 #include <errno.h>
   9 #include <sys/types.h>
  10 #include <sys/time.h>
  11 #include <sys/wait.h>
  12 #include <string.h>
  13 #include <limits.h>
  14 #include <pthread.h>
  15 #include "citadel.h"
  16 #include "server.h"
  17 #include <syslog.h>
  18 #ifdef HAVE_SYS_SELECT_H
  19 #include <sys/select.h>
  20 #endif
  21 #include "serv_chat.h"
  22 #include "sysdep_decls.h"
  23 #include "citserver.h"
  24 #include "support.h"
  25 #include "config.h"
  26 #include "dynloader.h"
  27
  28 struct ChatLine *ChatQueue = NULL;
  29 int ChatLastMsg = 0;
  30
  31 extern struct CitContext *ContextList;
  32
  33 #define MODULE_NAME     "Chat module"
  34 #define MODULE_AUTHOR   "Art Cancro"
  35 #define MODULE_EMAIL    "ajc@uncnsrd.mt-kisco.ny.us"
  36 #define MAJOR_VERSION   0
  37 #define MINOR_VERSION   2
  38
  39 static struct DLModule_Info info =
  40 {
  41   MODULE_NAME,
  42   MODULE_AUTHOR,
  43   MODULE_EMAIL,
  44   MAJOR_VERSION,
  45   MINOR_VERSION
  46 };
  47
  48 struct DLModule_Info *Dynamic_Module_Init(void)
  49 {
  50    CtdlRegisterProtoHook(cmd_chat, "CHAT",
  51                          "Initiates a real-time chat session");
  52    CtdlRegisterProtoHook(cmd_pexp, "PEXP", "Poll for express messages");
  53    CtdlRegisterProtoHook(cmd_sexp, "SEXP", "Send an express message");
  54    return &info;
  55 }
  56
  57 void allwrite(char *cmdbuf, int flag, char *roomname, char *username)
  58 {
  59         FILE *fp;
  60         char bcast[256];
  61         char *un;
  62         struct ChatLine *clptr, *clnew;
  63         time_t now;
  64
  65         if (CC->fake_username[0])
  66            un = CC->fake_username;
  67         else
  68            un = CC->usersupp.fullname;
  69         if (flag == 1)
  70         {
  71                 sprintf(bcast,":|<%s %s>",un,cmdbuf);
  72         }
  73         else
  74         if (flag == 0)
  75         {
  76                 sprintf(bcast,"%s|%s",un,cmdbuf);
  77         }
  78         else
  79         if (flag == 2)
  80         {
  81                 sprintf(bcast,":|<%s whispers %s>", un, cmdbuf);
  82         }
  83         if ((strcasecmp(cmdbuf,"NOOP")) && (flag !=2)) {
  84                 fp = fopen(CHATLOG,"a");
  85                 fprintf(fp,"%s\n",bcast);
  86                 fclose(fp);
  87                 }
  88
  89         clnew = (struct ChatLine *) malloc(sizeof(struct ChatLine));
  90         memset(clnew, 0, sizeof(struct ChatLine));
  91         if (clnew == NULL) {
  92                 fprintf(stderr, "citserver: cannot alloc chat line: %s\n",
  93                         strerror(errno));
  94                 return;
  95                 }
  96
  97         time(&now);
  98         clnew->next = NULL;
  99         clnew->chat_time = now;
 100         strncpy(clnew->chat_room, roomname, sizeof clnew->chat_room);
 101         clnew->chat_room[sizeof clnew->chat_room - 1] = 0;
 102         if (username)
 103           {
 104             strncpy(clnew->chat_username, username,
 105                     sizeof clnew->chat_username);
 106             clnew->chat_username[sizeof clnew->chat_username - 1] = 0;
 107           }
 108         else
 109            clnew->chat_username[0] = '\0';
 110         strcpy(clnew->chat_text, bcast);
 111
 112         /* Here's the critical section.
 113          * First, add the new message to the queue...
 114          */
 115         begin_critical_section(S_CHATQUEUE);
 116         ++ChatLastMsg;
 117         clnew->chat_seq = ChatLastMsg;
 118         if (ChatQueue == NULL) {
 119                 ChatQueue = clnew;
 120                 }
 121         else {
 122                 for (clptr=ChatQueue; clptr->next != NULL; clptr=clptr->next) ;;
 123                 clptr->next = clnew;
 124                 }
 125
 126         /* Then, before releasing the lock, free the expired messages */
 127         while(1) {
 128                 if (ChatQueue == NULL) goto DONE_FREEING;
 129                 if ( (now - ChatQueue->chat_time) < 120L ) goto DONE_FREEING;
 130                 clptr = ChatQueue;
 131                 ChatQueue = ChatQueue->next;
 132                 free(clptr);
 133                 }
 134 DONE_FREEING:   end_critical_section(S_CHATQUEUE);
 135         }
 136
 137
 138 t_context *find_context(char **unstr)
 139 {
 140    t_context *t_cc, *found_cc = NULL;
 141    char *name, *tptr;
 142
 143    if ((!*unstr) || (!unstr))
 144       return(NULL);
 145
 146    begin_critical_section(S_SESSION_TABLE);
 147    for (t_cc = ContextList; ((t_cc) && (!found_cc)); t_cc = t_cc->next)
 148    {
 149       if (t_cc->fake_username[0])
 150          name = t_cc->fake_username;
 151       else
 152          name = t_cc->curr_user;
 153       tptr = *unstr;
 154       if ((!strncasecmp(name, tptr, strlen(name))) && (tptr[strlen(name)] == ' '))
 155       {
 156          found_cc = t_cc;
 157          *unstr = &(tptr[strlen(name)+1]);
 158       }
 159    }
 160    end_critical_section(S_SESSION_TABLE);
 161
 162    return(found_cc);
 163 }
 164
 165 /*
 166  * List users in chat.  Setting allflag to 1 also lists users elsewhere.
 167  */
 168
 169 void do_chat_listing(int allflag)
 170 {
 171         struct CitContext *ccptr;
 172
 173         cprintf(":|\n:| Users currently in chat:\n");
 174         begin_critical_section(S_SESSION_TABLE);
 175         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 176                 if ( (!strcasecmp(ccptr->cs_room, "<chat>"))
 177                    && ((ccptr->cs_flags & CS_STEALTH) == 0)) {
 178                         cprintf(":| %-25s <%s>\n", (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user, ccptr->chat_room);
 179                         }
 180                 }
 181
 182         if (allflag == 1)
 183         {
 184                 cprintf(":|\n:| Users not in chat:\n");
 185                 for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next)
 186                 {
 187                         if ( (strcasecmp(ccptr->cs_room, "<chat>"))
 188                            && ((ccptr->cs_flags & CS_STEALTH) == 0))
 189                         {
 190                                 cprintf(":| %-25s <%s>:\n", (ccptr->fake_username[0]) ? ccptr->fake_username : ccptr->curr_user, (ccptr->fake_roomname[0]) ? ccptr->fake_roomname : ccptr->cs_room);
 191                         }
 192                 }
 193         }
 194
 195         end_critical_section(S_SESSION_TABLE);
 196         cprintf(":|\n");
 197         }
 198
 199
 200 void cmd_chat(char *argbuf)
 201 {
 202         char cmdbuf[256];
 203         char *un;
 204         char *strptr1;
 205         char hold_cs_room[ROOMNAMELEN];
 206         int MyLastMsg, ThisLastMsg;
 207         struct ChatLine *clptr;
 208         struct CitContext *t_context;
 209         int retval;
 210
 211         if (!(CC->logged_in)) {
 212                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 213                 return;
 214                 }
 215
 216         strcpy(CC->chat_room, "Main room");
 217
 218         strcpy(hold_cs_room,CC->cs_room);
 219         CC->cs_flags = CC->cs_flags | CS_CHAT;
 220         set_wtmpsupp("<chat>");
 221         cprintf("%d Entering chat mode (type '/help' for available commands)\n",
 222                 START_CHAT_MODE);
 223
 224         MyLastMsg = ChatLastMsg;
 225
 226         if ((CC->cs_flags & CS_STEALTH) == 0) {
 227                 allwrite("<entering chat>",0, CC->chat_room, NULL);
 228                 }
 229
 230         strcpy(cmdbuf, "");
 231
 232         while(1) {
 233                 int ok_cmd;
 234
 235                 ok_cmd = 0;
 236                 cmdbuf[strlen(cmdbuf) + 1] = 0;
 237                 retval = client_read_to(&cmdbuf[strlen(cmdbuf)], 1, 2);
 238
 239                 /* if we have a complete line, do send processing */
 240                 if (strlen(cmdbuf) > 0) if (cmdbuf[strlen(cmdbuf)-1] == 10) {
 241                         cmdbuf[strlen(cmdbuf) - 1] = 0;
 242                         time(&CC->lastcmd);
 243                         time(&CC->lastidle);
 244
 245                         if ( (!strcasecmp(cmdbuf,"exit"))
 246                         ||(!strcasecmp(cmdbuf,"/exit"))
 247                         ||(!strcasecmp(cmdbuf,"quit"))
 248                         ||(!strcasecmp(cmdbuf,"logout"))
 249                         ||(!strcasecmp(cmdbuf,"logoff"))
 250                         ||(!strcasecmp(cmdbuf,"/q"))
 251                         ||(!strcasecmp(cmdbuf,".q"))
 252                         ||(!strcasecmp(cmdbuf,"/quit"))
 253                                 ) strcpy(cmdbuf,"000");
 254
 255                         if (!strcmp(cmdbuf,"000")) {
 256                                 if ((CC->cs_flags & CS_STEALTH) == 0) {
 257                                         allwrite("<exiting chat>",0, CC->chat_room, NULL);
 258                                         }
 259                                 sleep(1);
 260                                 cprintf("000\n");
 261                                 CC->cs_flags = CC->cs_flags - CS_CHAT;
 262                                 set_wtmpsupp(hold_cs_room);
 263                                 return;
 264                                 }
 265
 266                         if ((!strcasecmp(cmdbuf,"/help"))
 267                         ||(!strcasecmp(cmdbuf,"help"))
 268                         ||(!strcasecmp(cmdbuf,"/?"))
 269                         ||(!strcasecmp(cmdbuf,"?"))) {
 270                                 cprintf(":|\n");
 271                                 cprintf(":|Available commands: \n");
 272                                 cprintf(":|/help   (prints this message) \n");
 273                                 cprintf(":|/who    (list users currently in chat) \n");
 274                                 cprintf(":|/whobbs (list users in chat -and- elsewhere) \n");
 275                                 cprintf(":|/me     ('action' line, ala irc) \n");
 276                                 cprintf(":|/msg    (send private message, ala irc) \n");
 277                                 cprintf(":|/join   (join new room) \n");
 278                                 cprintf(":|/quit   (return to the BBS) \n");
 279                                 cprintf(":|\n");
 280                                 ok_cmd = 1;
 281                                 }
 282                         if (!strcasecmp(cmdbuf,"/who")) {
 283                                 do_chat_listing(0);
 284                                 ok_cmd = 1;
 285                                 }
 286                         if (!strcasecmp(cmdbuf,"/whobbs")) {
 287                                 do_chat_listing(1);
 288                                 ok_cmd = 1;
 289                                 }
 290                         if (!strncasecmp(cmdbuf,"/me ",4)) {
 291                                 allwrite(&cmdbuf[4],1, CC->chat_room, NULL);
 292                                 ok_cmd = 1;
 293                                 }
 294
 295                         if (!strncasecmp(cmdbuf,"/msg ", 5))
 296                         {
 297                            ok_cmd =1;
 298                            strptr1 = &cmdbuf[5];
 299                            if ((t_context = find_context(&strptr1)))
 300                            {
 301                               allwrite(strptr1, 2, "", CC->curr_user);
 302                               if (strcasecmp(CC->curr_user, t_context->curr_user))
 303                                  allwrite(strptr1, 2, "", t_context->curr_user);
 304                            }
 305                            else
 306                               cprintf(":|User not found.\n", cmdbuf);
 307                         cprintf("\n");
 308                         }
 309
 310                         if (!strncasecmp(cmdbuf,"/join ", 6))
 311                         {
 312                            ok_cmd = 1;
 313                            allwrite("<changing rooms>",0, CC->chat_room, NULL);
 314                            if (!cmdbuf[6])
 315                               strcpy(CC->chat_room, "Main room");
 316                            else
 317                            {
 318                               strncpy(CC->chat_room, &cmdbuf[6],
 319                                       sizeof CC->chat_room);
 320                               CC->chat_room[sizeof CC->chat_room - 1] = 0;
 321                            }
 322                            allwrite("<joining room>",0, CC->chat_room, NULL);
 323                            cprintf("\n");
 324                         }
 325                         if ((cmdbuf[0]!='/')&&(strlen(cmdbuf)>0)) {
 326                                 ok_cmd = 1;
 327                                 allwrite(cmdbuf,0, CC->chat_room, NULL);
 328                                 }
 329
 330                         if ((!ok_cmd) && (cmdbuf[0]) && (cmdbuf[0] != '\n'))
 331                            cprintf(":|Command %s is not understood.\n", cmdbuf);
 332
 333                         strcpy(cmdbuf, "");
 334
 335                         }
 336
 337                 /* now check the queue for new incoming stuff */
 338
 339                 if (CC->fake_username[0])
 340                    un = CC->fake_username;
 341                 else
 342                    un = CC->curr_user;
 343                 if (ChatLastMsg > MyLastMsg) {
 344                         ThisLastMsg = ChatLastMsg;
 345                         for (clptr=ChatQueue; clptr!=NULL; clptr=clptr->next)
 346                         {
 347                            if ((clptr->chat_seq > MyLastMsg) && ((!clptr->chat_username[0]) || (!strncasecmp(un, clptr->chat_username, 32))))
 348                            {
 349                               if ((!clptr->chat_room[0]) || (!strncasecmp(CC->chat_room, clptr->chat_room, ROOMNAMELEN)))
 350                               {
 351                                  cprintf("%s\n", clptr->chat_text);
 352                               }
 353                            }
 354                         }
 355                         MyLastMsg = ThisLastMsg;
 356                         }
 357
 358                 }
 359         }
 360
 361
 362 /*
 363  * poll for express messages
 364  */
 365 void cmd_pexp(char *argbuf) /* arg unused */ {
 366         struct ExpressMessage *emptr;
 367
 368         if (CC->FirstExpressMessage == NULL) {
 369                 cprintf("%d No express messages waiting.\n",ERROR);
 370                 return;
 371                 }
 372
 373         cprintf("%d Express msgs:\n",LISTING_FOLLOWS);
 374
 375         while (CC->FirstExpressMessage != NULL) {
 376                 cprintf("%s", CC->FirstExpressMessage->em_text);
 377                 begin_critical_section(S_SESSION_TABLE);
 378                 emptr = CC->FirstExpressMessage;
 379                 CC->FirstExpressMessage = CC->FirstExpressMessage->next;
 380                 free(emptr);
 381                 end_critical_section(S_SESSION_TABLE);
 382                 }
 383         cprintf("000\n");
 384         }
 385
 386
 387 /*
 388  * send express messages  <bc>
 389  */
 390 void cmd_sexp(char *argbuf)
 391 {
 392         char x_user[256];
 393         char x_msg[256];
 394         int message_sent = 0;
 395         struct CitContext *ccptr;
 396         struct ExpressMessage *emptr, *emnew;
 397         char *lun;              /* <bc> */
 398
 399         if (!(CC->logged_in)) {
 400                 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
 401                 return;
 402                 }
 403
 404         if (num_parms(argbuf)!=2) {
 405                 cprintf("%d usage error\n",ERROR);
 406                 return;
 407                 }
 408
 409         if (CC->fake_username[0])
 410            lun = CC->fake_username;
 411         else
 412            lun = CC->usersupp.fullname;
 413
 414         extract(x_user,argbuf,0);
 415
 416         if (!strcmp(x_user, "."))
 417         {
 418            strcpy(x_user, CC->last_pager);
 419         }
 420         extract(x_msg,argbuf,1);
 421
 422         if (!x_user[0])
 423         {
 424            cprintf("%d You were not previously paged.\n", ERROR);
 425            return;
 426         }
 427
 428         if ( (!strcasecmp(x_user, "broadcast")) && (CC->usersupp.axlevel < 6) ) {
 429                 cprintf("%d Higher access required to send a broadcast.\n",
 430                         ERROR+HIGHER_ACCESS_REQUIRED);
 431                 return;
 432                 }
 433
 434         /* find the target user's context and append the message */
 435         begin_critical_section(S_SESSION_TABLE);
 436         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 437                 char *un;
 438
 439                 if (ccptr->fake_username[0])            /* <bc> */
 440                    un = ccptr->fake_username;
 441                 else
 442                    un = ccptr->usersupp.fullname;
 443
 444                 if ( (!strcasecmp(un, x_user))
 445                    || (!strcasecmp(x_user, "broadcast")) ) {
 446                         strcpy(ccptr->last_pager, CC->curr_user);
 447                         emnew = (struct ExpressMessage *)
 448                                 malloc(sizeof(struct ExpressMessage));
 449                         emnew->next = NULL;
 450                         sprintf(emnew->em_text, "%s from %s:\n %s\n",
 451                                 ( (!strcasecmp(x_user, "broadcast")) ? "Broadcast message" : "Message" ),
 452                                 lun, x_msg);
 453
 454                         if (ccptr->FirstExpressMessage == NULL) {
 455                                 ccptr->FirstExpressMessage = emnew;
 456                                 }
 457                         else {
 458                                 emptr = ccptr->FirstExpressMessage;
 459                                 while (emptr->next != NULL) {
 460                                         emptr = emptr->next;
 461                                         }
 462                                 emptr->next = emnew;
 463                                 }
 464
 465                         ++message_sent;
 466                         }
 467                 }
 468         end_critical_section(S_SESSION_TABLE);
 469
 470         if (message_sent > 0) {
 471                 cprintf("%d Message sent.\n",OK);
 472                 }
 473         else {
 474                 cprintf("%d No user '%s' logged in.\n",ERROR,x_user);
 475                 }
 476         }