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 static const char *defaulthost = DEFAULT_HOST;
  41 static const char *defaultport = DEFAULT_PORT;
  42
  43
  44 void unescape_input(char *buf)
  45 {
  46         int a,b;
  47         char hex[3];
  48
  49         while ((isspace(buf[strlen(buf)-1]))&&(strlen(buf)>0))
  50                 buf[strlen(buf)-1] = 0;
  51
  52         for (a=0; a<strlen(buf); ++a) {
  53                 if (buf[a]=='+') buf[a]=' ';
  54                 if (buf[a]=='%') {
  55                         hex[0]=buf[a+1];
  56                         hex[1]=buf[a+2];
  57                         hex[2]=0;
  58                         sscanf(hex,"%02x",&b);
  59                         buf[a] = (char) b;
  60                         strcpy(&buf[a+1],&buf[a+3]);
  61                         }
  62                 }
  63
  64         }
  65
  66
  67 void addurls(char *url) {
  68         char *up, *ptr;
  69         char buf[256];
  70         int a,b;
  71         struct urlcontent *u;
  72
  73         up = url;
  74         while (strlen(up)>0) {
  75
  76                 /* locate the = sign */
  77                 strncpy(buf,up,255);
  78                 b = (-1);
  79                 for (a=255; a>=0; --a) if (buf[a]=='=') b=a;
  80                 if (b<0) return;
  81                 buf[b]=0;
  82
  83                 u = (struct urlcontent *)malloc(sizeof(struct urlcontent));
  84                 u->next = urlstrings;
  85                 urlstrings = u;
  86                 strcpy(u->url_key, buf);
  87
  88                 /* now chop that part off */
  89                 for (a=0; a<=b; ++a) ++up;
  90
  91                 /* locate the & sign */
  92                 ptr = up;
  93                 b = strlen(up);
  94                 for (a=0; a<strlen(up); ++a) {
  95                         if (!strncmp(ptr,"&",1)) {
  96                                 b=a;
  97                                 break;
  98                                 }
  99                         ++ptr;
 100                         }
 101                 ptr = up;
 102                 for (a=0; a<b; ++a) ++ptr;
 103                 strcpy(ptr,"");
 104
 105                 u->url_data = malloc(strlen(up));
 106                 strcpy(u->url_data, up);
 107                 unescape_input(u->url_data);
 108
 109                 up = ptr;
 110                 ++up;
 111                 }
 112         }
 113
 114 void free_urls(void) {
 115         struct urlcontent *u;
 116
 117         while (urlstrings != NULL) {
 118                 free(urlstrings->url_data);
 119                 u = urlstrings->next;
 120                 free(urlstrings);
 121                 urlstrings = u;
 122                 }
 123         }
 124
 125 /*
 126  * Diagnostic function to display the contents of all variables
 127  */
 128 void dump_vars(void) {
 129         struct urlcontent *u;
 130
 131         for (u = urlstrings; u != NULL; u = u->next) {
 132                 wprintf("%38s = %s\n", u->url_key, u->url_data);
 133                 }
 134         }
 135
 136 char *bstr(char *key) {
 137         struct urlcontent *u;
 138
 139         for (u = urlstrings; u != NULL; u = u->next) {
 140                 if (!strcasecmp(u->url_key, key)) return(u->url_data);
 141                 }
 142         return("");
 143         }
 144
 145
 146 void wprintf(const char *format, ...) {
 147         va_list arg_ptr;
 148         struct webcontent *wptr;
 149
 150         wptr = (struct webcontent *)malloc(sizeof(struct webcontent));
 151         wptr->next = NULL;
 152         if (wlist == NULL) {
 153                 wlist = wptr;
 154                 wlast = wptr;
 155                 }
 156         else {
 157                 wlast->next = wptr;
 158                 wlast = wptr;
 159                 }
 160
 161         va_start(arg_ptr, format);
 162         vsprintf(wptr->w_data, format, arg_ptr);
 163         va_end(arg_ptr);
 164         }
 165
 166 int wContentLength(void) {
 167         struct webcontent *wptr;
 168         int len = 0;
 169
 170         for (wptr = wlist; wptr != NULL; wptr = wptr->next) {
 171                 len = len + strlen(wptr->w_data);
 172                 }
 173
 174         return(len);
 175         }
 176
 177 void wDumpContent(void) {
 178         struct webcontent *wptr;
 179
 180         printf("Content-type: text/html\n");
 181         printf("Content-length: %d\n", wContentLength());
 182         printf("\n");
 183
 184         while (wlist != NULL) {
 185                 fwrite(wlist->w_data, strlen(wlist->w_data), 1, stdout);
 186                 wptr = wlist->next;
 187                 free(wlist);
 188                 wlist = wptr;
 189                 }
 190         wlast = NULL;
 191         }
 192
 193
 194 void escputs1(char *strbuf, int nbsp)
 195 {
 196         int a;
 197
 198         for (a=0; a<strlen(strbuf); ++a) {
 199                 if (strbuf[a]=='<') wprintf("&lt;");
 200                 else if (strbuf[a]=='>') wprintf("&gt;");
 201                 else if (strbuf[a]=='&') wprintf("&amp;");
 202                 else if (strbuf[a]==34) wprintf("&quot;");
 203                 else if (strbuf[a]==LB) wprintf("<");
 204                 else if (strbuf[a]==RB) wprintf(">");
 205                 else if (strbuf[a]==QU) wprintf("\"");
 206                 else if ((strbuf[a]==32)&&(nbsp==1)) {
 207                         wprintf("&nbsp;");
 208                         }
 209                 else {
 210                         wprintf("%c", strbuf[a]);
 211                         }
 212                 }
 213         }
 214
 215 void escputs(char *strbuf)
 216 {
 217         escputs1(strbuf,0);
 218         }
 219
 220
 221
 222 char *urlesc(char *strbuf)
 223 {
 224         int a,b,c;
 225         char *ec = " #&;`'|*?-~<>^()[]{}$\\";
 226         static char outbuf[512];
 227
 228         strcpy(outbuf,"");
 229
 230         for (a=0; a<strlen(strbuf); ++a) {
 231                 c = 0;
 232                 for (b=0; b<strlen(ec); ++b) {
 233                         if (strbuf[a]==ec[b]) c=1;
 234                         }
 235                 b = strlen(outbuf);
 236                 if (c==1) sprintf(&outbuf[b],"%%%02x",strbuf[a]);
 237                 else sprintf(&outbuf[b],"%c",strbuf[a]);
 238                 }
 239         return(outbuf);
 240         }
 241
 242 void urlescputs(char *strbuf)
 243 {
 244         wprintf("%s",urlesc(strbuf));
 245         }
 246
 247
 248 /*
 249  * Look for URL's embedded in a buffer and make them linkable.  We use a
 250  * target window in order to keep the BBS session in its own window.
 251  */
 252 void url(char *buf)
 253 {
 254
 255         int pos;
 256         int start,end;
 257         char ench;
 258         char urlbuf[256];
 259         char outbuf[256];
 260
 261         start = (-1);
 262         end = strlen(buf);
 263         ench = 0;
 264
 265         for (pos=0; pos<strlen(buf); ++pos) {
 266                 if (!strncasecmp(&buf[pos],"http://",7)) start = pos;
 267                 if (!strncasecmp(&buf[pos],"ftp://",6)) start = pos;
 268                 }
 269
 270         if (start<0) return;
 271
 272         if ((start>0)&&(buf[start-1]=='<')) ench = '>';
 273         if ((start>0)&&(buf[start-1]=='[')) ench = ']';
 274         if ((start>0)&&(buf[start-1]=='(')) ench = ')';
 275         if ((start>0)&&(buf[start-1]=='{')) ench = '}';
 276
 277         for (pos=strlen(buf); pos>start; --pos) {
 278                 if ((buf[pos]==' ')||(buf[pos]==ench)) end = pos;
 279                 }
 280
 281         strncpy(urlbuf,&buf[start],end-start);
 282         urlbuf[end-start] = 0;
 283
 284
 285         strncpy(outbuf,buf,start);
 286         sprintf(&outbuf[start],"%cA HREF=%c%s%c TARGET=%c%s%c%c%s%c/A%c",
 287                 LB,QU,urlbuf,QU,QU,TARGET,QU,RB,urlbuf,LB,RB);
 288         strcat(outbuf,&buf[end]);
 289         strcpy(buf,outbuf);
 290         }
 291
 292
 293
 294
 295 void getz(char *buf) {
 296         if (fgets(buf, 256, stdin) == NULL) strcpy(buf, "");
 297         else {
 298                 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
 299                         buf[strlen(buf)-1] = 0;
 300                 }
 301         }
 302
 303 /*
 304  * Output all that important stuff that the browser will want to see
 305  */
 306 void output_headers(void) {
 307
 308         static char *unset = "; expires=28-May-1971 18:10:00 GMT";
 309
 310         printf("Server: %s\n", SERVER);
 311         printf("Connection: close\n");
 312         printf("Set-cookie: wc_session=%d\n", wc_session);
 313
 314         if (strlen(wc_host)>0) printf("Set-cookie: wc_host=%s\n", wc_host);
 315         else printf("Set-cookie: wc_host=%s\n", unset);
 316
 317         if (strlen(wc_port)>0) printf("Set-cookie: wc_port=%s\n", wc_port);
 318         else printf("Set-cookie: wc_port=%s\n", unset);
 319
 320         if (strlen(wc_username)>0) printf("Set-cookie: wc_username=%s\n",
 321                 wc_username);
 322         else printf("Set-cookie: wc_username=%s\n", unset);
 323
 324         if (strlen(wc_password)>0) printf("Set-cookie: wc_password=%s\n",
 325                 wc_password);
 326         else printf("Set-cookie: wc_password=%s\n", unset);
 327
 328         if (strlen(wc_roomname)>0) printf("Set-cookie: wc_roomname=%s\n",
 329                 wc_roomname);
 330         else printf("Set-cookie: wc_roomname=%s\n", unset);
 331         }
 332
 333 void output_static(char *what) {
 334         char buf[256];
 335         FILE *fp;
 336         struct stat statbuf;
 337         off_t bytes;
 338
 339         sprintf(buf, "static/%s", what);
 340         fp = fopen(buf, "rb");
 341         if (fp == NULL) {
 342                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 343                 output_headers();
 344                 printf("Content-Type: text/plain\n");
 345                 sprintf(buf, "%s: %s\n", what, strerror(errno));
 346                 printf("Content-length: %d\n", strlen(buf));
 347                 printf("\n");
 348                 fwrite(buf, strlen(buf), 1, stdout);
 349                 }
 350         else {
 351                 printf("HTTP/1.0 200 OK\n");
 352                 output_headers();
 353
 354                 if (!strncasecmp(&what[strlen(what)-4], ".gif", 4))
 355                         printf("Content-type: image/gif\n");
 356                 else if (!strncasecmp(&what[strlen(what)-5], ".html", 5))
 357                         printf("Content-type: text/html\n");
 358                 else
 359                         printf("Content-type: application/octet-stream\n");
 360
 361                 fstat(fileno(fp), &statbuf);
 362                 bytes = statbuf.st_size;
 363                 printf("Content-length: %ld\n", (long)bytes);
 364                 printf("\n");
 365                 while (bytes--) {
 366                         putc(getc(fp), stdout);
 367                         }
 368                 fflush(stdout);
 369                 fclose(fp);
 370                 }
 371         }
 372
 373 void output_image() {
 374         char buf[256];
 375         char xferbuf[4096];
 376         off_t bytes;
 377         off_t thisblock;
 378         off_t accomplished = 0L;
 379
 380
 381         serv_printf("OIMG %s|%s", bstr("name"), bstr("parm"));
 382         serv_gets(buf);
 383         if (buf[0]=='2') {
 384                 bytes = extract_long(&buf[4], 0);
 385                 printf("HTTP/1.0 200 OK\n");
 386                 output_headers();
 387                 printf("Content-type: image/gif\n");
 388                 printf("Content-length: %ld\n", bytes);
 389                 printf("\n");
 390
 391                 while (bytes > (off_t)0) {
 392                         thisblock = (off_t)sizeof(xferbuf);
 393                         if (thisblock > bytes) thisblock = bytes;
 394                         serv_printf("READ %ld|%ld", accomplished, thisblock);
 395                         serv_gets(buf);
 396                         if (buf[0]=='6') thisblock = extract_long(&buf[4],0);
 397                         serv_read(xferbuf, (int)thisblock);
 398                         fwrite(xferbuf, thisblock, 1, stdout);
 399                         bytes = bytes - thisblock;
 400                         accomplished = accomplished + thisblock;
 401                         }
 402                 fflush(stdout);
 403                 serv_puts("CLOS");
 404                 serv_gets(buf);
 405                 }
 406         else {
 407                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 408                 output_headers();
 409                 printf("Content-Type: text/plain\n");
 410                 sprintf(buf, "Error retrieving image\n");
 411                 printf("Content-length: %d\n", strlen(buf));
 412                 printf("\n");
 413                 fwrite(buf, strlen(buf), 1, stdout);
 414                 }
 415
 416         }
 417
 418 void extract_action(char *actbuf, char *cmdbuf) {
 419         int i;
 420
 421         strcpy(actbuf, cmdbuf);
 422         if (!strncasecmp(actbuf, "GET /", 5)) strcpy(actbuf, &actbuf[5]);
 423         if (!strncasecmp(actbuf, "PUT /", 5)) strcpy(actbuf, &actbuf[5]);
 424         if (!strncasecmp(actbuf, "POST /", 6)) strcpy(actbuf, &actbuf[6]);
 425
 426         for (i=0; i<strlen(actbuf); ++i) {
 427                 if (actbuf[i]==' ') { actbuf[i]=0; i=0; }
 428                 if (actbuf[i]=='/') { actbuf[i]=0; i=0; }
 429                 if (actbuf[i]=='?') { actbuf[i]=0; i=0; }
 430                 if (actbuf[i]=='&') { actbuf[i]=0; i=0; }
 431                 }
 432         }
 433
 434
 435 void session_loop(void) {
 436         char cmd[256];
 437         char action[256];
 438         char buf[256];
 439         int a, b;
 440         int ContentLength = 0;
 441         char *content;
 442 FILE *fp;
 443
 444         /* We stuff these with the values coming from the client cookies,
 445          * so we can use them to reconnect a timed out session if we have to.
 446          */
 447         char c_host[256];
 448         char c_port[256];
 449         char c_username[256];
 450         char c_password[256];
 451         char c_roomname[256];
 452
 453         strcpy(c_host, defaulthost);
 454         strcpy(c_port, defaultport);
 455         strcpy(c_username, "");
 456         strcpy(c_password, "");
 457         strcpy(c_roomname, "");
 458
 459         getz(cmd);
 460         extract_action(action, cmd);
 461
 462         do {
 463                 getz(buf);
 464
 465                 if (!strncasecmp(buf, "Cookie: wc_host=", 16))
 466                         strcpy(c_host, &buf[16]);
 467                 if (!strncasecmp(buf, "Cookie: wc_port=", 16))
 468                         strcpy(c_port, &buf[16]);
 469                 if (!strncasecmp(buf, "Cookie: wc_username=", 20))
 470                         strcpy(c_username, &buf[20]);
 471                 if (!strncasecmp(buf, "Cookie: wc_password=", 20))
 472                         strcpy(c_password, &buf[20]);
 473                 if (!strncasecmp(buf, "Cookie: wc_roomname=", 20))
 474                         strcpy(c_roomname, &buf[20]);
 475
 476                 if (!strncasecmp(buf, "Content-length: ", 16)) {
 477                         ContentLength = atoi(&buf[16]);
 478                         }
 479
 480                 } while(strlen(buf)>0);
 481
 482         ++TransactionCount;
 483
 484         if (ContentLength > 0) {
 485                 content = malloc(ContentLength+1);
 486                 fread(content, ContentLength, 1, stdin);
 487 fp = fopen("content", "wb");
 488 fwrite(content, ContentLength, 1, fp);
 489 fclose(fp);
 490                 content[ContentLength] = 0;
 491                 addurls(content);
 492                 }
 493         else {
 494                 content = NULL;
 495                 }
 496
 497         /*
 498          * If we're not connected to a Citadel server, try to hook up the
 499          * connection now.  Preference is given to the host and port specified
 500          * by browser cookies, if cookies have been supplied.
 501          */
 502         if (!connected) {
 503                 serv_sock = connectsock(c_host, c_port, "tcp");
 504                 connected = 1;
 505                 serv_gets(buf); /* get the server welcome message */
 506                 strcpy(wc_host, c_host);
 507                 strcpy(wc_port, c_port);
 508                 get_serv_info();
 509                 }
 510
 511
 512         /*
 513          * If we're not logged in, but we have username and password cookies
 514          * supplied by the browser, try using them to log in.
 515          */
 516         if ((!logged_in)&&(strlen(c_username)>0)&&(strlen(c_password)>0)) {
 517                 serv_printf("USER %s", c_username);
 518                 serv_gets(buf);
 519                 if (buf[0]=='3') {
 520                         serv_printf("PASS %s", c_password);
 521                         serv_gets(buf);
 522                         if (buf[0]=='2') {
 523                                 become_logged_in(c_username, c_password, buf);
 524                                 }
 525                         }
 526                 }
 527
 528         /*
 529          * If we don't have a current room, but a cookie specifying the
 530          * current room is supplied, make an effort to go there.
 531          */
 532         if ((strlen(wc_roomname)==0) && (strlen(c_roomname)>0) ) {
 533                 serv_printf("GOTO %s", c_roomname);
 534                 serv_gets(buf);
 535                 if (buf[0]=='2') {
 536                         strcpy(wc_roomname, c_roomname);
 537                         }
 538                 }
 539
 540         /* If there are variables in the URL, we must grab them now */
 541         for (a=0; a<strlen(cmd); ++a) if ((cmd[a]=='?')||(cmd[a]=='&')) {
 542                 for (b=a; b<strlen(cmd); ++b) if (isspace(cmd[b])) cmd[b]=0;
 543                 addurls(&cmd[a+1]);
 544                 cmd[a] = 0;
 545                 }
 546
 547         if (!strcasecmp(action, "static")) {
 548                 strcpy(buf, &cmd[12]);
 549                 for (a=0; a<strlen(buf); ++a) if (isspace(buf[a])) buf[a]=0;
 550                 output_static(buf);
 551                 }
 552
 553         else if (!strcasecmp(action, "image")) {
 554                 output_image();
 555                 }
 556
 557         else if ((!logged_in)&&(!strcasecmp(action, "login"))) {
 558                 do_login();
 559                 }
 560
 561         else if (!logged_in) {
 562                 display_login(NULL);
 563                 }
 564
 565         /* Various commands... */
 566
 567         else if (!strcasecmp(action, "do_welcome")) {
 568                 do_welcome();
 569                 }
 570
 571         else if (!strcasecmp(action, "display_main_menu")) {
 572                 display_main_menu();
 573                 }
 574
 575         else if (!strcasecmp(action, "advanced")) {
 576                 display_advanced_menu();
 577                 }
 578
 579         else if (!strcasecmp(action, "whobbs")) {
 580                 whobbs();
 581                 }
 582
 583         else if (!strcasecmp(action, "knrooms")) {
 584                 list_all_rooms_by_floor();
 585                 }
 586
 587         else if (!strcasecmp(action, "gotonext")) {
 588                 slrp_highest();
 589                 gotonext();
 590                 }
 591
 592         else if (!strcasecmp(action, "skip")) {
 593                 gotonext();
 594                 }
 595
 596         else if (!strcasecmp(action, "ungoto")) {
 597                 ungoto();
 598                 }
 599
 600         else if (!strcasecmp(action, "dotgoto")) {
 601                 slrp_highest();
 602                 dotgoto();
 603                 }
 604
 605         else if (!strcasecmp(action, "termquit")) {
 606                 do_logout();
 607                 }
 608
 609         /* When all else fails... */
 610         else {
 611                 printf("HTTP/1.0 200 OK\n");
 612                 output_headers();
 613
 614                 wprintf("<HTML><HEAD><TITLE>WebCit</TITLE></HEAD><BODY BACKGROUND=\"/image&name=background\" TEXT=\"#000000\" LINK=\"#004400\">\n");
 615                 wprintf("TransactionCount is %d<BR>\n", TransactionCount);
 616                 wprintf("You're in session %d<HR>\n", wc_session);
 617                 wprintf("Command: <BR><PRE>\n");
 618                 escputs(cmd);
 619                 wprintf("</PRE><HR>\n");
 620                 wprintf("Variables: <BR><PRE>\n");
 621                 dump_vars();
 622                 wprintf("</PRE><HR>\n");
 623                 wprintf("</BODY></HTML>\n");
 624                 wDumpContent();
 625                 }
 626
 627         fflush(stdout);
 628         if (content != NULL) {
 629                 free(content);
 630                 content = NULL;
 631                 }
 632         free_urls();
 633         }
 634
 635 int main(int argc, char *argv[]) {
 636
 637         if (argc < 2 || argc > 4) {
 638                 fprintf(stderr,
 639                         "webcit: usage: webcit <session_id> [host [port]]\n");
 640                 return 1;
 641                 }
 642
 643         wc_session = atoi(argv[1]);
 644
 645         if (argc > 2) {
 646                 defaulthost = argv[2];
 647                 if (argc > 3)
 648                         defaultport = argv[3];
 649                 }
 650
 651         strcpy(wc_host, "");
 652         strcpy(wc_port, "");
 653         strcpy(wc_username, "");
 654         strcpy(wc_password, "");
 655         strcpy(wc_roomname, "");
 656
 657         while (1) {
 658                 session_loop();
 659                 }
 660         }