webcit/webcit.c

   1 /*
   2  * webcit.c
   3  *
   4  * This is the actual program called by the webserver.  It maintains a
   5  * persistent session to the Citadel server, handling HTTP WebCit requests as
   6  * they arrive and presenting a user interface.
   7  *
   8  * $Id$
   9  */
  10
  11 #include <stdlib.h>
  12 #ifdef HAVE_UNISTD_H
  13 #include <unistd.h>
  14 #endif
  15 #include <stdio.h>
  16 #include <ctype.h>
  17 #include <string.h>
  18 #include <errno.h>
  19 #include <sys/stat.h>
  20 #include <stdarg.h>
  21 #include "webcit.h"
  22 #include "child.h"
  23
  24 int wc_session;
  25 char wc_host[256];
  26 char wc_port[256];
  27 char wc_username[256];
  28 char wc_password[256];
  29 char wc_roomname[256];
  30 int TransactionCount = 0;
  31 int connected = 0;
  32 int logged_in = 0;
  33 int axlevel;
  34
  35 struct webcontent *wlist = NULL;
  36 struct webcontent *wlast = NULL;
  37
  38 struct urlcontent *urlstrings = NULL;
  39
  40
  41 void unescape_input(char *buf)
  42 {
  43         int a,b;
  44         char hex[3];
  45
  46         while ((isspace(buf[strlen(buf)-1]))&&(strlen(buf)>0))
  47                 buf[strlen(buf)-1] = 0;
  48
  49         for (a=0; a<strlen(buf); ++a) {
  50                 if (buf[a]=='+') buf[a]=' ';
  51                 if (buf[a]=='%') {
  52                         hex[0]=buf[a+1];
  53                         hex[1]=buf[a+2];
  54                         hex[2]=0;
  55                         sscanf(hex,"%02x",&b);
  56                         buf[a] = (char) b;
  57                         strcpy(&buf[a+1],&buf[a+3]);
  58                         }
  59                 }
  60
  61         }
  62
  63
  64 void addurls(char *url) {
  65         char *up, *ptr;
  66         char buf[256];
  67         int a,b;
  68         struct urlcontent *u;
  69
  70         up = url;
  71         while (strlen(up)>0) {
  72
  73                 /* locate the = sign */
  74                 strncpy(buf,up,255);
  75                 b = (-1);
  76                 for (a=255; a>=0; --a) if (buf[a]=='=') b=a;
  77                 if (b<0) return;
  78                 buf[b]=0;
  79
  80                 u = (struct urlcontent *)malloc(sizeof(struct urlcontent));
  81                 u->next = urlstrings;
  82                 urlstrings = u;
  83                 strcpy(u->url_key, buf);
  84
  85                 /* now chop that part off */
  86                 for (a=0; a<=b; ++a) ++up;
  87
  88                 /* locate the & sign */
  89                 ptr = up;
  90                 b = strlen(up);
  91                 for (a=0; a<strlen(up); ++a) {
  92                         if (!strncmp(ptr,"&",1)) {
  93                                 b=a;
  94                                 break;
  95                                 }
  96                         ++ptr;
  97                         }
  98                 ptr = up;
  99                 for (a=0; a<b; ++a) ++ptr;
 100                 strcpy(ptr,"");
 101
 102                 u->url_data = malloc(strlen(up));
 103                 strcpy(u->url_data, up);
 104                 unescape_input(u->url_data);
 105
 106                 up = ptr;
 107                 ++up;
 108                 }
 109         }
 110
 111 void free_urls(void) {
 112         struct urlcontent *u;
 113
 114         while (urlstrings != NULL) {
 115                 free(urlstrings->url_data);
 116                 u = urlstrings->next;
 117                 free(urlstrings);
 118                 urlstrings = u;
 119                 }
 120         }
 121
 122 /*
 123  * Diagnostic function to display the contents of all variables
 124  */
 125 void dump_vars(void) {
 126         struct urlcontent *u;
 127
 128         for (u = urlstrings; u != NULL; u = u->next) {
 129                 wprintf("%38s = %s\n", u->url_key, u->url_data);
 130                 }
 131         }
 132
 133 char *bstr(char *key) {
 134         struct urlcontent *u;
 135
 136         for (u = urlstrings; u != NULL; u = u->next) {
 137                 if (!strcasecmp(u->url_key, key)) return(u->url_data);
 138                 }
 139         return("");
 140         }
 141
 142
 143 void wprintf(const char *format, ...) {
 144         va_list arg_ptr;
 145         struct webcontent *wptr;
 146
 147         wptr = (struct webcontent *)malloc(sizeof(struct webcontent));
 148         wptr->next = NULL;
 149         if (wlist == NULL) {
 150                 wlist = wptr;
 151                 wlast = wptr;
 152                 }
 153         else {
 154                 wlast->next = wptr;
 155                 wlast = wptr;
 156                 }
 157
 158         va_start(arg_ptr, format);
 159         vsprintf(wptr->w_data, format, arg_ptr);
 160         va_end(arg_ptr);
 161         }
 162
 163 int wContentLength(void) {
 164         struct webcontent *wptr;
 165         int len = 0;
 166
 167         for (wptr = wlist; wptr != NULL; wptr = wptr->next) {
 168                 len = len + strlen(wptr->w_data);
 169                 }
 170
 171         return(len);
 172         }
 173
 174 void wDumpContent(void) {
 175         struct webcontent *wptr;
 176
 177         printf("Content-type: text/html\n");
 178         printf("Content-length: %d\n", wContentLength());
 179         printf("\n");
 180
 181         while (wlist != NULL) {
 182                 fwrite(wlist->w_data, strlen(wlist->w_data), 1, stdout);
 183                 wptr = wlist->next;
 184                 free(wlist);
 185                 wlist = wptr;
 186                 }
 187         wlast = NULL;
 188         }
 189
 190
 191 void escputs1(char *strbuf, int nbsp)
 192 {
 193         int a;
 194
 195         for (a=0; a<strlen(strbuf); ++a) {
 196                 if (strbuf[a]=='<') wprintf("&lt;");
 197                 else if (strbuf[a]=='>') wprintf("&gt;");
 198                 else if (strbuf[a]=='&') wprintf("&amp;");
 199                 else if (strbuf[a]==34) wprintf("&quot;");
 200                 else if (strbuf[a]==LB) wprintf("<");
 201                 else if (strbuf[a]==RB) wprintf(">");
 202                 else if (strbuf[a]==QU) wprintf("\"");
 203                 else if ((strbuf[a]==32)&&(nbsp==1)) {
 204                         wprintf("&nbsp;");
 205                         }
 206                 else {
 207                         wprintf("%c", strbuf[a]);
 208                         }
 209                 }
 210         }
 211
 212 void escputs(char *strbuf)
 213 {
 214         escputs1(strbuf,0);
 215         }
 216
 217
 218
 219 char *urlesc(char *strbuf)
 220 {
 221         int a,b,c;
 222         char *ec = " #&;`'|*?-~<>^()[]{}$\\";
 223         static char outbuf[512];
 224
 225         strcpy(outbuf,"");
 226
 227         for (a=0; a<strlen(strbuf); ++a) {
 228                 c = 0;
 229                 for (b=0; b<strlen(ec); ++b) {
 230                         if (strbuf[a]==ec[b]) c=1;
 231                         }
 232                 b = strlen(outbuf);
 233                 if (c==1) sprintf(&outbuf[b],"%%%02x",strbuf[a]);
 234                 else sprintf(&outbuf[b],"%c",strbuf[a]);
 235                 }
 236         return(outbuf);
 237         }
 238
 239 void urlescputs(char *strbuf)
 240 {
 241         wprintf("%s",urlesc(strbuf));
 242         }
 243
 244
 245 /*
 246  * Look for URL's embedded in a buffer and make them linkable.  We use a
 247  * target window in order to keep the BBS session in its own window.
 248  */
 249 void url(char *buf)
 250 {
 251
 252         int pos;
 253         int start,end;
 254         char ench;
 255         char urlbuf[256];
 256         char outbuf[256];
 257
 258         start = (-1);
 259         end = strlen(buf);
 260         ench = 0;
 261
 262         for (pos=0; pos<strlen(buf); ++pos) {
 263                 if (!strncasecmp(&buf[pos],"http://",7)) start = pos;
 264                 if (!strncasecmp(&buf[pos],"ftp://",6)) start = pos;
 265                 }
 266
 267         if (start<0) return;
 268
 269         if ((start>0)&&(buf[start-1]=='<')) ench = '>';
 270         if ((start>0)&&(buf[start-1]=='[')) ench = ']';
 271         if ((start>0)&&(buf[start-1]=='(')) ench = ')';
 272         if ((start>0)&&(buf[start-1]=='{')) ench = '}';
 273
 274         for (pos=strlen(buf); pos>start; --pos) {
 275                 if ((buf[pos]==' ')||(buf[pos]==ench)) end = pos;
 276                 }
 277
 278         strncpy(urlbuf,&buf[start],end-start);
 279         urlbuf[end-start] = 0;
 280
 281
 282         strncpy(outbuf,buf,start);
 283         sprintf(&outbuf[start],"%cA HREF=%c%s%c TARGET=%c%s%c%c%s%c/A%c",
 284                 LB,QU,urlbuf,QU,QU,TARGET,QU,RB,urlbuf,LB,RB);
 285         strcat(outbuf,&buf[end]);
 286         strcpy(buf,outbuf);
 287         }
 288
 289
 290
 291
 292 void getz(char *buf) {
 293         if (fgets(buf, 256, stdin) == NULL) strcpy(buf, "");
 294         else {
 295                 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
 296                         buf[strlen(buf)-1] = 0;
 297                 }
 298         }
 299
 300 /*
 301  * Output all that important stuff that the browser will want to see
 302  */
 303 void output_headers(void) {
 304
 305         static char *unset = "; expires=28-May-1971 18:10:00 GMT";
 306
 307         printf("Server: %s\n", SERVER);
 308         printf("Connection: close\n");
 309         printf("Set-cookie: wc_session=%d\n", wc_session);
 310
 311         if (strlen(wc_host)>0) printf("Set-cookie: wc_host=%s\n", wc_host);
 312         else printf("Set-cookie: wc_host=%s\n", unset);
 313
 314         if (strlen(wc_port)>0) printf("Set-cookie: wc_port=%s\n", wc_port);
 315         else printf("Set-cookie: wc_port=%s\n", unset);
 316
 317         if (strlen(wc_username)>0) printf("Set-cookie: wc_username=%s\n",
 318                 wc_username);
 319         else printf("Set-cookie: wc_username=%s\n", unset);
 320
 321         if (strlen(wc_password)>0) printf("Set-cookie: wc_password=%s\n",
 322                 wc_password);
 323         else printf("Set-cookie: wc_password=%s\n", unset);
 324
 325         if (strlen(wc_roomname)>0) printf("Set-cookie: wc_roomname=%s\n",
 326                 wc_roomname);
 327         else printf("Set-cookie: wc_roomname=%s\n", unset);
 328         }
 329
 330 void output_static(char *what) {
 331         char buf[256];
 332         FILE *fp;
 333         struct stat statbuf;
 334         off_t bytes;
 335
 336         fprintf(stderr, "output_static(%s)\n", what);
 337         sprintf(buf, "static/%s", what);
 338         fp = fopen(buf, "rb");
 339         if (fp == NULL) {
 340                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 341                 output_headers();
 342                 printf("Content-Type: text/plain\n");
 343                 sprintf(buf, "%s: %s\n", what, strerror(errno));
 344                 printf("Content-length: %d\n", strlen(buf));
 345                 printf("\n");
 346                 fwrite(buf, strlen(buf), 1, stdout);
 347                 }
 348         else {
 349                 fprintf(stderr, "opened it ok\n");
 350                 printf("HTTP/1.0 200 OK\n");
 351                 output_headers();
 352
 353                 if (!strncasecmp(&what[strlen(what)-4], ".gif", 4))
 354                         printf("Content-type: image/gif\n");
 355                 else if (!strncasecmp(&what[strlen(what)-5], ".html", 5))
 356                         printf("Content-type: text/html\n");
 357                 else
 358                         printf("Content-type: application/octet-stream\n");
 359
 360                 fstat(fileno(fp), &statbuf);
 361                 bytes = statbuf.st_size;
 362                 printf("Content-length: %ld\n", (long)bytes);
 363                 printf("\n");
 364                 while (bytes--) {
 365                         putc(getc(fp), stdout);
 366                         }
 367                 fflush(stdout);
 368                 fclose(fp);
 369                 }
 370         }
 371
 372 static const char *defaulthost = DEFAULT_HOST;
 373 static const char *defaultport = DEFAULT_PORT;
 374
 375
 376 void extract_action(char *actbuf, char *cmdbuf) {
 377         int i;
 378
 379         strcpy(actbuf, cmdbuf);
 380         if (!strncasecmp(actbuf, "GET /", 5)) strcpy(actbuf, &actbuf[5]);
 381         if (!strncasecmp(actbuf, "PUT /", 5)) strcpy(actbuf, &actbuf[5]);
 382         if (!strncasecmp(actbuf, "POST /", 6)) strcpy(actbuf, &actbuf[6]);
 383
 384         for (i=0; i<strlen(actbuf); ++i) {
 385                 if (actbuf[i]==' ') { actbuf[i]=0; i=0; }
 386                 if (actbuf[i]=='/') { actbuf[i]=0; i=0; }
 387                 if (actbuf[i]=='?') { actbuf[i]=0; i=0; }
 388                 if (actbuf[i]=='&') { actbuf[i]=0; i=0; }
 389                 }
 390         }
 391
 392
 393 void session_loop(void) {
 394         char cmd[256];
 395         char action[256];
 396         char buf[256];
 397         int a, b;
 398         int ContentLength = 0;
 399         char *content;
 400
 401         /* We stuff these with the values coming from the client cookies,
 402          * so we can use them to reconnect a timed out session if we have to.
 403          */
 404         char c_host[256];
 405         char c_port[256];
 406         char c_username[256];
 407         char c_password[256];
 408         char c_roomname[256];
 409
 410         strcpy(c_host, defaulthost);
 411         strcpy(c_port, defaultport);
 412         strcpy(c_username, "");
 413         strcpy(c_password, "");
 414         strcpy(c_roomname, "");
 415
 416         getz(cmd);
 417         extract_action(action, cmd);
 418
 419         do {
 420                 getz(buf);
 421
 422                 if (!strncasecmp(buf, "Cookie: wc_host=", 16))
 423                         strcpy(c_host, &buf[16]);
 424                 if (!strncasecmp(buf, "Cookie: wc_port=", 16))
 425                         strcpy(c_port, &buf[16]);
 426                 if (!strncasecmp(buf, "Cookie: wc_username=", 20))
 427                         strcpy(c_username, &buf[20]);
 428                 if (!strncasecmp(buf, "Cookie: wc_password=", 20))
 429                         strcpy(c_password, &buf[20]);
 430                 if (!strncasecmp(buf, "Cookie: wc_roomname=", 20))
 431                         strcpy(c_roomname, &buf[20]);
 432
 433                 if (!strncasecmp(buf, "Content-length: ", 16)) {
 434                         ContentLength = atoi(&buf[16]);
 435                         }
 436
 437                 } while(strlen(buf)>0);
 438
 439         ++TransactionCount;
 440
 441         if (ContentLength > 0) {
 442                 content = malloc(ContentLength+1);
 443                 fread(content, ContentLength, 1, stdin);
 444                 content[ContentLength] = 0;
 445                 addurls(content);
 446                 }
 447         else {
 448                 content = NULL;
 449                 }
 450
 451         /*
 452          * If we're not connected to a Citadel server, try to hook up the
 453          * connection now.  Preference is given to the host and port specified
 454          * by browser cookies, if cookies have been supplied.
 455          */
 456         if (!connected) {
 457                 serv_sock = connectsock(c_host, c_port, "tcp");
 458                 connected = 1;
 459                 serv_gets(buf); /* get the server welcome message */
 460                 strcpy(wc_host, c_host);
 461                 strcpy(wc_port, c_port);
 462                 get_serv_info();
 463                 }
 464
 465
 466         /*
 467          * If we're not logged in, but we have username and password cookies
 468          * supplied by the browser, try using them to log in.
 469          */
 470         if ((!logged_in)&&(strlen(c_username)>0)&&(strlen(c_password)>0)) {
 471                 serv_printf("USER %s", c_username);
 472                 serv_gets(buf);
 473                 if (buf[0]=='3') {
 474                         serv_printf("PASS %s", c_password);
 475                         serv_gets(buf);
 476                         if (buf[0]=='2') {
 477                                 become_logged_in(c_username, c_password, buf);
 478                                 }
 479                         }
 480                 }
 481
 482         /*
 483          * If we don't have a current room, but a cookie specifying the
 484          * current room is supplied, make an effort to go there.
 485          */
 486         if ((strlen(wc_roomname)==0) && (strlen(c_roomname)>0) ) {
 487                 serv_printf("GOTO %s", c_roomname);
 488                 serv_gets(buf);
 489                 if (buf[0]=='2') {
 490                         strcpy(wc_roomname, c_roomname);
 491                         }
 492                 }
 493
 494         /* If there are variables in the URL, we must grab them now */
 495         for (a=0; a<strlen(cmd); ++a) if ((cmd[a]=='?')||(cmd[a]=='&')) {
 496                 for (b=a; b<strlen(cmd); ++b) if (isspace(cmd[b])) cmd[b]=0;
 497                 addurls(&cmd[a+1]);
 498                 cmd[a] = 0;
 499                 }
 500
 501         if (!strcasecmp(action, "static")) {
 502                 strcpy(buf, &cmd[12]);
 503                 for (a=0; a<strlen(buf); ++a) if (isspace(buf[a])) buf[a]=0;
 504                 output_static(buf);
 505                 }
 506
 507         else if ((!logged_in)&&(!strcasecmp(action, "login"))) {
 508                 do_login();
 509                 }
 510
 511         else if (!logged_in) {
 512                 display_login(NULL);
 513                 }
 514
 515         /* Various commands... */
 516
 517         else if (!strcasecmp(action, "do_welcome")) {
 518                 do_welcome();
 519                 }
 520
 521         else if (!strcasecmp(action, "display_main_menu")) {
 522                 display_main_menu();
 523                 }
 524
 525         else if (!strcasecmp(action, "advanced")) {
 526                 display_advanced_menu();
 527                 }
 528
 529         else if (!strcasecmp(action, "whobbs")) {
 530                 whobbs();
 531                 }
 532
 533         else if (!strcasecmp(action, "knrooms")) {
 534                 list_all_rooms_by_floor();
 535                 }
 536
 537         else if (!strcasecmp(action, "gotonext")) {
 538                 slrp_highest();
 539                 gotonext();
 540                 }
 541
 542         else if (!strcasecmp(action, "skip")) {
 543                 gotonext();
 544                 }
 545
 546         else if (!strcasecmp(action, "ungoto")) {
 547                 ungoto();
 548                 }
 549
 550         else if (!strcasecmp(action, "dotgoto")) {
 551                 slrp_highest();
 552                 dotgoto();
 553                 }
 554
 555         else if (!strcasecmp(action, "termquit")) {
 556                 do_logout();
 557                 }
 558
 559         /* When all else fails... */
 560         else {
 561                 printf("HTTP/1.0 200 OK\n");
 562                 output_headers();
 563
 564                 wprintf("<HTML><HEAD><TITLE>WebCit</TITLE></HEAD><BODY>\n");
 565                 wprintf("TransactionCount is %d<BR>\n", TransactionCount);
 566                 wprintf("You're in session %d<HR>\n", wc_session);
 567                 wprintf("Command: <BR><PRE>\n");
 568                 escputs(cmd);
 569                 wprintf("</PRE><HR>\n");
 570                 wprintf("Variables: <BR><PRE>\n");
 571                 dump_vars();
 572                 wprintf("</PRE><HR>\n");
 573                 wprintf("</BODY></HTML>\n");
 574                 wDumpContent();
 575                 }
 576
 577         fflush(stdout);
 578         if (content != NULL) {
 579                 free(content);
 580                 content = NULL;
 581                 }
 582         free_urls();
 583         }
 584
 585 int main(int argc, char *argv[]) {
 586
 587         if (argc < 2 || argc > 4) {
 588                 fprintf(stderr,
 589                         "webcit: usage: webcit <session_id> [host [port]]\n");
 590                 return 1;
 591                 }
 592
 593         wc_session = atoi(argv[1]);
 594
 595         if (argc > 2) {
 596                 defaulthost = argv[2];
 597                 if (argc > 3)
 598                         defaultport = argv[3];
 599                 }
 600
 601         strcpy(wc_host, "");
 602         strcpy(wc_port, "");
 603         strcpy(wc_username, "");
 604         strcpy(wc_password, "");
 605         strcpy(wc_roomname, "");
 606
 607         while (1) {
 608                 session_loop();
 609                 }
 610         }