citadel/serv_chat.c

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