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 <ctype.h>
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <stdio.h>
  15 #include <fcntl.h>
  16 #include <signal.h>
  17 #include <sys/types.h>
  18 #include <sys/wait.h>
  19 #include <sys/socket.h>
  20 #include <sys/time.h>
  21 #include <sys/stat.h>
  22 #include <limits.h>
  23 #include <netinet/in.h>
  24 #include <netdb.h>
  25 #include <string.h>
  26 #include <pwd.h>
  27 #include <errno.h>
  28 #include <stdarg.h>
  29 #include <pthread.h>
  30 #include <signal.h>
  31 #include "webcit.h"
  32 #include "webserver.h"
  33 #include "mime_parser.h"
  34
  35 /*
  36  * String to unset the cookie.
  37  * Any date "in the past" will work, so I chose my birthday, right down to
  38  * the exact minute.  :)
  39  */
  40 static char *unset = "; expires=28-May-1971 18:10:00 GMT";
  41
  42 void unescape_input(char *buf)
  43 {
  44         int a, b;
  45         char hex[3];
  46
  47         while ((isspace(buf[strlen(buf) - 1])) && (strlen(buf) > 0))
  48                 buf[strlen(buf) - 1] = 0;
  49
  50         for (a = 0; a < strlen(buf); ++a) {
  51                 if (buf[a] == '+')
  52                         buf[a] = ' ';
  53                 if (buf[a] == '%') {
  54                         hex[0] = buf[a + 1];
  55                         hex[1] = buf[a + 2];
  56                         hex[2] = 0;
  57                         sscanf(hex, "%02x", &b);
  58                         buf[a] = (char) b;
  59                         strcpy(&buf[a + 1], &buf[a + 3]);
  60                 }
  61         }
  62
  63 }
  64
  65
  66 void addurls(char *url)
  67 {
  68         char *up, *ptr;
  69         char buf[SIZ];
  70         int a, b;
  71         struct urlcontent *u;
  72
  73         up = url;
  74         while (strlen(up) > 0) {
  75
  76                 /* locate the = sign */
  77                 safestrncpy(buf, up, sizeof buf);
  78                 b = (-1);
  79                 for (a = 255; a >= 0; --a)
  80                         if (buf[a] == '=')
  81                                 b = a;
  82                 if (b < 0)
  83                         return;
  84                 buf[b] = 0;
  85
  86                 u = (struct urlcontent *) malloc(sizeof(struct urlcontent));
  87                 u->next = WC->urlstrings;
  88                 WC->urlstrings = u;
  89                 strcpy(u->url_key, buf);
  90
  91                 /* now chop that part off */
  92                 for (a = 0; a <= b; ++a)
  93                         ++up;
  94
  95                 /* locate the & sign */
  96                 ptr = up;
  97                 b = strlen(up);
  98                 for (a = 0; a < strlen(up); ++a) {
  99                         if (!strncmp(ptr, "&", 1)) {
 100                                 b = a;
 101                                 break;
 102                         }
 103                         ++ptr;
 104                 }
 105                 ptr = up;
 106                 for (a = 0; a < b; ++a)
 107                         ++ptr;
 108                 strcpy(ptr, "");
 109
 110                 u->url_data = malloc(strlen(up) + 1);
 111                 strcpy(u->url_data, up);
 112                 u->url_data[b] = 0;
 113                 unescape_input(u->url_data);
 114                 up = ptr;
 115                 ++up;
 116         }
 117 }
 118
 119 void free_urls(void)
 120 {
 121         struct urlcontent *u;
 122
 123         while (WC->urlstrings != NULL) {
 124                 free(WC->urlstrings->url_data);
 125                 u = WC->urlstrings->next;
 126                 free(WC->urlstrings);
 127                 WC->urlstrings = u;
 128         }
 129 }
 130
 131 /*
 132  * Diagnostic function to display the contents of all variables
 133  */
 134 void dump_vars(void)
 135 {
 136         struct urlcontent *u;
 137
 138         for (u = WC->urlstrings; u != NULL; u = u->next) {
 139                 wprintf("%38s = %s\n", u->url_key, u->url_data);
 140         }
 141 }
 142
 143 char *bstr(char *key)
 144 {
 145         struct urlcontent *u;
 146
 147         for (u = WC->urlstrings; u != NULL; u = u->next) {
 148                 if (!strcasecmp(u->url_key, key))
 149                         return (u->url_data);
 150         }
 151         return ("");
 152 }
 153
 154
 155 void wprintf(const char *format,...)
 156 {
 157         va_list arg_ptr;
 158         char wbuf[4096];
 159
 160         va_start(arg_ptr, format);
 161         vsprintf(wbuf, format, arg_ptr);
 162         va_end(arg_ptr);
 163
 164         write(WC->http_sock, wbuf, strlen(wbuf));
 165 }
 166
 167
 168 /*
 169  * wDumpContent() wraps up an HTTP session, closes tags, etc.
 170  *
 171  * print_standard_html_footer should be set to 0 to transmit only, 1 to
 172  * append the main menu and closing tags, or 2 to
 173  * append the closing tags only.
 174  */
 175 void wDumpContent(int print_standard_html_footer)
 176 {
 177         if (print_standard_html_footer) {
 178                 do_template("trailing");
 179         }
 180
 181
 182 }
 183
 184
 185 /*
 186  * Copy a string, escaping characters which have meaning in HTML.  If
 187  * nbsp is nonzero, spaces are converted to non-breaking spaces.
 188  */
 189 void stresc(char *target, char *strbuf, int nbsp)
 190 {
 191         int a;
 192         strcpy(target, "");
 193
 194         for (a = 0; a < strlen(strbuf); ++a) {
 195                 if (strbuf[a] == '<')
 196                         strcat(target, "&lt;");
 197                 else if (strbuf[a] == '>')
 198                         strcat(target, "&gt;");
 199                 else if (strbuf[a] == '&')
 200                         strcat(target, "&amp;");
 201                 else if (strbuf[a] == '\"')
 202                         strcat(target, "&quot;");
 203                 else if (strbuf[a] == '\'')
 204                         strcat(target, "&#39;");
 205                 else if (strbuf[a] == LB)
 206                         strcat(target, "<");
 207                 else if (strbuf[a] == RB)
 208                         strcat(target, ">");
 209                 else if (strbuf[a] == QU)
 210                         strcat(target, "\"");
 211                 else if ((strbuf[a] == 32) && (nbsp == 1)) {
 212                         strcat(target, "&nbsp;");
 213                 } else {
 214                         strncat(target, &strbuf[a], 1);
 215                 }
 216         }
 217 }
 218
 219 void escputs1(char *strbuf, int nbsp)
 220 {
 221         char buf[1024];
 222         stresc(buf, strbuf, nbsp);
 223         wprintf("%s", buf);
 224 }
 225
 226 void escputs(char *strbuf)
 227 {
 228         escputs1(strbuf, 0);
 229 }
 230
 231 /*
 232  * Escape a string for feeding out as a URL.
 233  * Returns a pointer to a buffer that must be freed by the caller!
 234  */
 235 void urlesc(char *outbuf, char *strbuf)
 236 {
 237         int a, b, c;
 238         char *ec = " #&;`'|*?-~<>^()[]{}$\\";
 239
 240         strcpy(outbuf, "");
 241
 242         for (a = 0; a < strlen(strbuf); ++a) {
 243                 c = 0;
 244                 for (b = 0; b < strlen(ec); ++b) {
 245                         if (strbuf[a] == ec[b])
 246                                 c = 1;
 247                 }
 248                 b = strlen(outbuf);
 249                 if (c == 1)
 250                         sprintf(&outbuf[b], "%%%02x", strbuf[a]);
 251                 else
 252                         sprintf(&outbuf[b], "%c", strbuf[a]);
 253         }
 254 }
 255
 256 void urlescputs(char *strbuf)
 257 {
 258         char outbuf[SIZ];
 259
 260         urlesc(outbuf, strbuf);
 261         wprintf("%s", outbuf);
 262 }
 263
 264
 265
 266
 267 /*
 268  * Output all that important stuff that the browser will want to see
 269  *
 270  * control codes:
 271  *
 272  * Bits 0 and 1:
 273  * 0 = Nothing.  Do not display any leading HTTP or HTML.
 274  * 1 = HTTP headers plus the room banner
 275  * 2 = HTTP headers required to terminate the session (unset cookies)
 276  * 3 = HTTP and HTML headers, but no room banner
 277  *
 278  * Bit 2: Set to 1 to auto-refresh page every 30 seconds
 279  *
 280  * Bit 3: suppress check for express messages
 281  */
 282 void output_headers(int controlcode)
 283 {
 284         char cookie[SIZ];
 285         int print_standard_html_head = 0;
 286         int refresh30 = 0;
 287         int suppress_check = 0;
 288         char httpnow[SIZ];
 289         static int pageseq = 0;
 290         print_standard_html_head        =       controlcode & 0x03;
 291         refresh30                       =       ((controlcode & 0x04) >> 2);
 292         suppress_check                  =       ((controlcode & 0x08) >> 3);
 293
 294         wprintf("HTTP/1.0 200 OK\n");
 295
 296         httpdate(httpnow, time(NULL));
 297
 298         if (print_standard_html_head > 0) {
 299                 wprintf("Content-type: text/html\n"
 300                         "Server: %s\n", SERVER
 301                 );
 302                 wprintf("Connection: close\n"
 303                         "Pragma: no-cache\n"
 304                         "Cache-Control: no-store\n"
 305                 );
 306         }
 307
 308         stuff_to_cookie(cookie, WC->wc_session, WC->wc_username,
 309                         WC->wc_password, WC->wc_roomname);
 310
 311         if (print_standard_html_head == 2) {
 312                 wprintf("Set-cookie: webcit=%s\n", unset);
 313         } else {
 314                 wprintf("Set-cookie: webcit=%s\n", cookie);
 315                 if (server_cookie != NULL) {
 316                         wprintf("%s\n", server_cookie);
 317                 }
 318         }
 319
 320         if (print_standard_html_head > 0) {
 321                 wprintf("\n");
 322
 323                 if (refresh30) svprintf("REFRESHTAG", WCS_STRING,
 324                         "<META HTTP-EQUIV=\"refresh\" CONTENT=\"30\">\n");
 325                 else svprintf("REFRESHTAG", WCS_STRING,
 326                         "<META HTTP-EQUIV=\"refresh\" CONTENT=\"500363689;\">\n");
 327                 /* script for checking for pages (not always launched) */
 328                 svprintf("PAGERSCRIPT", WCS_STRING,
 329                         "<SCRIPT LANGUAGE=\"JavaScript\">\n"
 330                         "function launch_page_popup() {\n"
 331                         "pwin = window.open('/page_popup', 'CitaPage%d', "
 332                         "'toolbar=no,location=no,copyhistory=no,status=no,"
 333                         "scrollbars=yes,resizable=no,height=250,width=400');\n"
 334                         "}\n"
 335                         "</SCRIPT>\n",
 336                         ++pageseq
 337                 );
 338                 /* end script */
 339
 340                 do_template("head");
 341                 clear_local_substs();
 342
 343                 if (!suppress_check) if (WC->HaveExpressMessages) {
 344                         svprintf("extrabodyparms", WCS_STRING, "%s",
 345                                 "onload=\"launch_page_popup()\" ");
 346                         WC->HaveExpressMessages = 0;
 347                 }
 348
 349                 do_template("background");
 350                 clear_local_substs();
 351         }
 352
 353         if (print_standard_html_head == 1) {
 354                 wprintf("<A NAME=\"TheTop\"></A>");
 355                 embed_room_banner(NULL);
 356         }
 357
 358         if (strlen(WC->ImportantMessage) > 0) {
 359                 do_template("beginbox_nt");
 360                 wprintf("<SPAN CLASS=\"errormsg\">"
 361                         "%s</SPAN><BR>\n", WC->ImportantMessage);
 362                 do_template("endbox");
 363                 strcpy(WC->ImportantMessage, "");
 364         }
 365 }
 366
 367
 368 /*
 369  *
 370  */
 371 void http_redirect(char *whichpage) {
 372         wprintf("HTTP/1.0 302 Moved Temporarily\n");
 373         wprintf("Location: %s\n", whichpage);
 374         wprintf("URI: %s\n", whichpage);
 375         wprintf("Content-type: text/html\n\n");
 376         wprintf("<html><body>\n");
 377         wprintf("you really want to be <A HREF=\"%s\">here</A> now\n",
 378                 whichpage);
 379         wprintf("</body></html>\n");
 380 }
 381
 382
 383
 384 void check_for_express_messages()
 385 {
 386         char buf[SIZ];
 387
 388         serv_puts("NOOP");
 389         serv_gets(buf);
 390         if (buf[3] == '*') WC->HaveExpressMessages = 1;
 391 }
 392
 393
 394
 395
 396 /*
 397  * Output a piece of content to the web browser
 398  */
 399 void http_transmit_thing(char *thing, size_t length, char *content_type) {
 400         output_headers(0);
 401         wprintf("Content-type: %s\n"
 402                 "Content-length: %ld\n"
 403                 "Server: %s\n"
 404                 "Connection: close\n"
 405                 "\n",
 406                 content_type,
 407                 (long) length,
 408                 SERVER
 409         );
 410         write(WC->http_sock, thing, (size_t)length);
 411 }
 412
 413
 414
 415
 416 void output_static(char *what)
 417 {
 418         char buf[4096];
 419         FILE *fp;
 420         struct stat statbuf;
 421         off_t bytes;
 422         char *bigbuffer;
 423         char content_type[SIZ];
 424
 425         lprintf(9, "output_static(%s)\n", what);
 426         sprintf(buf, "static/%s", what);
 427         fp = fopen(buf, "rb");
 428         if (fp == NULL) {
 429                 wprintf("HTTP/1.0 404 %s\n", strerror(errno));
 430                 wprintf("Content-Type: text/plain\n");
 431                 wprintf("\n");
 432                 wprintf("Cannot open %s: %s\n", what, strerror(errno));
 433         } else {
 434                 if (!strncasecmp(&what[strlen(what) - 4], ".gif", 4))
 435                         strcpy(content_type, "image/gif");
 436                 else if (!strncasecmp(&what[strlen(what) - 4], ".txt", 4))
 437                         strcpy(content_type, "text/plain");
 438                 else if (!strncasecmp(&what[strlen(what) - 4], ".css", 4))
 439                         strcpy(content_type, "text/css");
 440                 else if (!strncasecmp(&what[strlen(what) - 4], ".jpg", 4))
 441                         strcpy(content_type, "image/jpeg");
 442                 else if (!strncasecmp(&what[strlen(what) - 4], ".png", 4))
 443                         strcpy(content_type, "image/png");
 444                 else if (!strncasecmp(&what[strlen(what) - 5], ".html", 5))
 445                         strcpy(content_type, "text/html");
 446                 else if (!strncasecmp(&what[strlen(what) - 4], ".wml", 4))
 447                         strcpy(content_type, "text/vnd.wap.wml");
 448                 else if (!strncasecmp(&what[strlen(what) - 5], ".wmls", 5))
 449                         strcpy(content_type, "text/vnd.wap.wmlscript");
 450                 else if (!strncasecmp(&what[strlen(what) - 5], ".wmlc", 5))
 451                         strcpy(content_type, "application/vnd.wap.wmlc");
 452                 else if (!strncasecmp(&what[strlen(what) - 6], ".wmlsc", 6))
 453                         strcpy(content_type, "application/vnd.wap.wmlscriptc");
 454                 else if (!strncasecmp(&what[strlen(what) - 5], ".wbmp", 5))
 455                         wprintf("Content-type: image/vnd.wap.wbmp");
 456                 else
 457                         wprintf("Content-type: application/octet-stream");
 458
 459                 fstat(fileno(fp), &statbuf);
 460                 bytes = statbuf.st_size;
 461                 lprintf(3, "Static: %s, %ld bytes\n", what, bytes);
 462                 bigbuffer = malloc(bytes);
 463                 fread(bigbuffer, bytes, 1, fp);
 464                 fclose(fp);
 465
 466                 http_transmit_thing(bigbuffer, (size_t)bytes, content_type);
 467                 free(bigbuffer);
 468         }
 469         if (!strcasecmp(bstr("force_close_session"), "yes")) {
 470                 end_webcit_session();
 471         }
 472 }
 473
 474
 475 /*
 476  * When the browser requests an image file from the Citadel server,
 477  * this function is called to transmit it.
 478  */
 479 void output_image()
 480 {
 481         char buf[SIZ];
 482         char *xferbuf = NULL;
 483         off_t bytes;
 484
 485         serv_printf("OIMG %s|%s", bstr("name"), bstr("parm"));
 486         serv_gets(buf);
 487         if (buf[0] == '2') {
 488                 bytes = extract_long(&buf[4], 0);
 489                 xferbuf = malloc(bytes);
 490
 491                 /* Read it from the server */
 492                 read_server_binary(xferbuf, bytes);
 493                 serv_puts("CLOS");
 494                 serv_gets(buf);
 495
 496                 /* Write it to the browser */
 497                 http_transmit_thing(xferbuf, (size_t)bytes, "image/gif");
 498                 free(xferbuf);
 499
 500         } else {
 501
 502                 /* Instead of an ugly 404, send a 1x1 transparent GIF
 503                  * when there's no such image on the server.
 504                  */
 505                 output_static("blank.gif");
 506
 507                 /*
 508                 wprintf("HTTP/1.0 404 %s\n", &buf[4]);
 509                 output_headers(0);
 510                 wprintf("Content-Type: text/plain\n"
 511                         "\n"
 512                         "Error retrieving image: %s\n",
 513                         &buf[4]
 514                 );
 515                 */
 516
 517         }
 518
 519
 520
 521 }
 522
 523 /*
 524  */
 525 void output_mimepart()
 526 {
 527         char buf[SIZ];
 528         off_t bytes;
 529         char content_type[SIZ];
 530         char *content = NULL;
 531
 532         serv_printf("OPNA %s|%s", bstr("msgnum"), bstr("partnum"));
 533         serv_gets(buf);
 534         if (buf[0] == '2') {
 535                 bytes = extract_long(&buf[4], 0);
 536                 content = malloc(bytes);
 537                 extract(content_type, &buf[4], 3);
 538                 output_headers(0);
 539                 read_server_binary(content, bytes);
 540                 serv_puts("CLOS");
 541                 serv_gets(buf);
 542                 http_transmit_thing(content, bytes, content_type);
 543                 free(content);
 544         } else {
 545                 wprintf("HTTP/1.0 404 %s\n", &buf[4]);
 546                 output_headers(0);
 547                 wprintf("Content-Type: text/plain\n");
 548                 wprintf("\n");
 549                 wprintf("Error retrieving part: %s\n", &buf[4]);
 550         }
 551
 552 }
 553
 554
 555 /*
 556  */
 557 char *load_mimepart(long msgnum, char *partnum)
 558 {
 559         char buf[SIZ];
 560         off_t bytes;
 561         char content_type[SIZ];
 562         char *content;
 563
 564         serv_printf("OPNA %ld|%s", msgnum, partnum);
 565         serv_gets(buf);
 566         if (buf[0] == '2') {
 567                 bytes = extract_long(&buf[4], 0);
 568                 extract(content_type, &buf[4], 3);
 569
 570                 content = malloc(bytes + 1);
 571                 read_server_binary(content, bytes);
 572
 573                 serv_puts("CLOS");
 574                 serv_gets(buf);
 575                 content[bytes] = 0;     /* null terminate for good measure */
 576                 return(content);
 577         }
 578         else {
 579                 return(NULL);
 580         }
 581
 582 }
 583
 584
 585 /*
 586  * Convenience functions to display a page containing only a string
 587  */
 588 void convenience_page(char *titlebarcolor, char *titlebarmsg, char *messagetext)
 589 {
 590         wprintf("HTTP/1.0 200 OK\n");
 591         output_headers(1);
 592         wprintf("<TABLE WIDTH=100%% BORDER=0 BGCOLOR=\"#%s\"><TR><TD>", titlebarcolor);
 593         wprintf("<SPAN CLASS=\"titlebar\">%s</SPAN>\n", titlebarmsg);
 594         wprintf("</TD></TR></TABLE><BR>\n");
 595         escputs(messagetext);
 596
 597         wprintf("<HR>\n");
 598         wDumpContent(1);
 599 }
 600
 601
 602 /*
 603  * Display a blank page.
 604  */
 605 void blank_page(void) {
 606         output_headers(7);
 607         wDumpContent(2);
 608 }
 609
 610
 611 /*
 612  * A template has been requested
 613  */
 614 void url_do_template(void) {
 615         do_template(bstr("template"));
 616 }
 617
 618
 619
 620 /*
 621  * Offer to make any page the user's "start page."
 622  */
 623 void offer_start_page(void) {
 624         wprintf("<A HREF=\"/change_start_page?startpage=");
 625         urlescputs(WC->this_page);
 626         wprintf("\">"
 627                 "<FONT SIZE=-2 COLOR=\"#AAAAAA\">Make this my start page</FONT>"
 628                 "</A>"
 629         );
 630 }
 631
 632
 633 /*
 634  * Change the user's start page
 635  */
 636 void change_start_page(void) {
 637
 638         if (bstr("startpage") == NULL) {
 639                 strcpy(WC->ImportantMessage,
 640                         "startpage set to null");
 641                 display_main_menu();
 642                 return;
 643         }
 644
 645         set_preference("startpage", bstr("startpage"));
 646
 647         output_headers(3);
 648         do_template("newstartpage");
 649         wDumpContent(1);
 650 }
 651
 652
 653
 654
 655 void display_success(char *successmessage)
 656 {
 657         convenience_page("007700", "OK", successmessage);
 658 }
 659
 660
 661
 662 void extract_action(char *actbuf, char *cmdbuf)
 663 {
 664         int i;
 665
 666         strcpy(actbuf, cmdbuf);
 667         if (!strncasecmp(actbuf, "GET /", 5))
 668                 strcpy(actbuf, &actbuf[5]);
 669         if (!strncasecmp(actbuf, "PUT /", 5))
 670                 strcpy(actbuf, &actbuf[5]);
 671         if (!strncasecmp(actbuf, "POST /", 6))
 672                 strcpy(actbuf, &actbuf[6]);
 673
 674         for (i = 0; i < strlen(actbuf); ++i) {
 675                 if (actbuf[i] == ' ') {
 676                         actbuf[i] = 0;
 677                         i = 0;
 678                 }
 679                 if (actbuf[i] == '/') {
 680                         actbuf[i] = 0;
 681                         i = 0;
 682                 }
 683                 if (actbuf[i] == '?') {
 684                         actbuf[i] = 0;
 685                         i = 0;
 686                 }
 687                 if (actbuf[i] == '&') {
 688                         actbuf[i] = 0;
 689                         i = 0;
 690                 }
 691         }
 692 }
 693
 694
 695 void upload_handler(char *name, char *filename, char *partnum, char *disp,
 696                         void *content, char *cbtype, size_t length,
 697                         char *encoding, void *userdata)
 698 {
 699         struct urlcontent *u;
 700
 701         /* Form fields */
 702         if ( (length > 0) && (strlen(cbtype) == 0) ) {
 703                 u = (struct urlcontent *) malloc(sizeof(struct urlcontent));
 704                 u->next = WC->urlstrings;
 705                 WC->urlstrings = u;
 706                 safestrncpy(u->url_key, name, sizeof(u->url_key));
 707                 u->url_data = malloc(length + 1);
 708                 memcpy(u->url_data, content, length);
 709                 u->url_data[length] = 0;
 710         }
 711
 712         /* Uploaded files */
 713         if ( (length > 0) && (strlen(cbtype) > 0) ) {
 714                 WC->upload = malloc(length);
 715                 if (WC->upload != NULL) {
 716                         WC->upload_length = length;
 717                         safestrncpy(WC->upload_filename, filename,
 718                                         sizeof(WC->upload_filename));
 719                         safestrncpy(WC->upload_content_type, cbtype,
 720                                         sizeof(WC->upload_content_type));
 721                         memcpy(WC->upload, content, length);
 722                 }
 723                 else {
 724                         lprintf(3, "malloc() failed: %s\n", strerror(errno));
 725                 }
 726         }
 727
 728 }
 729
 730
 731
 732
 733 /*
 734  * Entry point for WebCit transaction
 735  */
 736 void session_loop(struct httprequest *req)
 737 {
 738         char cmd[SIZ];
 739         char action[SIZ];
 740         char buf[SIZ];
 741         int a, b;
 742         int ContentLength = 0;
 743         int BytesRead;
 744         char ContentType[512];
 745         char *content;
 746         char *content_end;
 747         struct httprequest *hptr;
 748         char browser_host[SIZ];
 749         char user_agent[SIZ];
 750         int body_start;
 751
 752         /* We stuff these with the values coming from the client cookies,
 753          * so we can use them to reconnect a timed out session if we have to.
 754          */
 755         char c_username[SIZ];
 756         char c_password[SIZ];
 757         char c_roomname[SIZ];
 758         char cookie[SIZ];
 759
 760         strcpy(c_username, "");
 761         strcpy(c_password, "");
 762         strcpy(c_roomname, "");
 763
 764         WC->upload_length = 0;
 765         WC->upload = NULL;
 766
 767         WC->is_wap = 0;
 768
 769         hptr = req;
 770         if (hptr == NULL) return;
 771
 772         strcpy(cmd, hptr->line);
 773         hptr = hptr->next;
 774         extract_action(action, cmd);
 775
 776         while (hptr != NULL) {
 777                 strcpy(buf, hptr->line);
 778                 hptr = hptr->next;
 779
 780                 if (!strncasecmp(buf, "Cookie: webcit=", 15)) {
 781                         strcpy(cookie, &buf[15]);
 782                         cookie_to_stuff(cookie, NULL,
 783                                       c_username, c_password, c_roomname);
 784                 }
 785                 else if (!strncasecmp(buf, "Content-length: ", 16)) {
 786                         ContentLength = atoi(&buf[16]);
 787                 }
 788                 else if (!strncasecmp(buf, "Content-type: ", 14)) {
 789                         safestrncpy(ContentType, &buf[14], sizeof ContentType);
 790                 }
 791                 else if (!strncasecmp(buf, "User-agent: ", 12)) {
 792                         safestrncpy(user_agent, &buf[12], sizeof user_agent);
 793                 }
 794                 else if (!strncasecmp(buf, "Host: ", 6)) {
 795                         safestrncpy(WC->http_host, &buf[6], sizeof WC->http_host);
 796                 }
 797                 /* Only WAP gateways explicitly name this content-type */
 798                 else if (strstr(buf, "text/vnd.wap.wml")) {
 799                         WC->is_wap = 1;
 800                 }
 801         }
 802
 803         if (ContentLength > 0) {
 804                 content = malloc(ContentLength + SIZ);
 805                 memset(content, 0, ContentLength + SIZ);
 806                 sprintf(content, "Content-type: %s\n"
 807                                 "Content-length: %d\n\n",
 808                                 ContentType, ContentLength);
 809                 body_start = strlen(content);
 810
 811                 BytesRead = 0;
 812                 while (BytesRead < ContentLength) {
 813                         a=read(WC->http_sock, &content[BytesRead+body_start],
 814                                 ContentLength - BytesRead);
 815                         if (a <= 0) BytesRead = ContentLength;
 816                         else BytesRead += a;
 817                 }
 818
 819                 if (!strncasecmp(ContentType,
 820                               "application/x-www-form-urlencoded", 33)) {
 821                         addurls(&content[body_start]);
 822                 } else if (!strncasecmp(ContentType, "multipart", 9)) {
 823                         content_end = content + ContentLength + body_start;
 824                         mime_parser(content, content_end, *upload_handler,
 825                                         NULL, NULL, NULL, 0);
 826                 }
 827         } else {
 828                 content = NULL;
 829         }
 830
 831         /* make a note of where we are in case the user wants to save it */
 832         safestrncpy(WC->this_page, cmd, sizeof(WC->this_page));
 833         remove_token(WC->this_page, 2, ' ');
 834         remove_token(WC->this_page, 0, ' ');
 835
 836         /* If there are variables in the URL, we must grab them now */
 837         for (a = 0; a < strlen(cmd); ++a) {
 838                 if ((cmd[a] == '?') || (cmd[a] == '&')) {
 839                         for (b = a; b < strlen(cmd); ++b)
 840                                 if (isspace(cmd[b]))
 841                                         cmd[b] = 0;
 842                         addurls(&cmd[a + 1]);
 843                         cmd[a] = 0;
 844                 }
 845         }
 846
 847         /* Static content can be sent without connecting to Citadel. */
 848         if (!strcasecmp(action, "static")) {
 849                 strcpy(buf, &cmd[12]);
 850                 for (a = 0; a < strlen(buf); ++a)
 851                         if (isspace(buf[a]))
 852                                 buf[a] = 0;
 853                 output_static(buf);
 854                 goto SKIP_ALL_THIS_CRAP;        /* Don't try to connect */
 855         }
 856
 857         /*
 858          * If we're not connected to a Citadel server, try to hook up the
 859          * connection now.
 860          */
 861         if (!WC->connected) {
 862                 if (!strcasecmp(ctdlhost, "uds")) {
 863                         /* unix domain socket */
 864                         sprintf(buf, "%s/citadel.socket", ctdlport);
 865                         WC->serv_sock = uds_connectsock(buf);
 866                 }
 867                 else {
 868                         /* tcp socket */
 869                         WC->serv_sock = tcp_connectsock(ctdlhost, ctdlport);
 870                 }
 871
 872                 if (WC->serv_sock < 0) {
 873                         do_logout();
 874                         goto SKIP_ALL_THIS_CRAP;
 875                 }
 876                 else {
 877                         WC->connected = 1;
 878                         serv_gets(buf); /* get the server welcome message */
 879                         locate_host(browser_host, WC->http_sock);
 880                         get_serv_info(browser_host, user_agent);
 881                         if (serv_info.serv_rev_level < MINIMUM_CIT_VERSION) {
 882                                 wprintf("You are connected to a Citadel "
 883                                         "server running Citadel %d.%02d;\nin "
 884                                         "order to run this version of WebCit "
 885                                         "you must also have Citadel %d.%02d or"
 886                                         " newer.\n\n\n",
 887                                                 serv_info.serv_rev_level / 100,
 888                                                 serv_info.serv_rev_level % 100,
 889                                                 MINIMUM_CIT_VERSION / 100,
 890                                                 MINIMUM_CIT_VERSION % 100
 891                                         );
 892                                 end_webcit_session();
 893                                 goto SKIP_ALL_THIS_CRAP;
 894                         }
 895                 }
 896         }
 897
 898         /*
 899          * Functions which can be performed without logging in
 900          */
 901         if (!strcasecmp(action, "listsub")) {
 902                 do_listsub();
 903                 goto SKIP_ALL_THIS_CRAP;
 904         }
 905 #ifdef WEBCIT_WITH_CALENDAR_SERVICE
 906         if (!strcasecmp(action, "freebusy")) {
 907                 do_freebusy(cmd);
 908                 goto SKIP_ALL_THIS_CRAP;
 909         }
 910 #endif
 911
 912         check_for_express_messages();
 913
 914         /*
 915          * If we're not logged in, but we have username and password cookies
 916          * supplied by the browser, try using them to log in.
 917          */
 918         if ((!WC->logged_in) && (strlen(c_username) > 0) && (strlen(c_password) > 0)) {
 919                 serv_printf("USER %s", c_username);
 920                 serv_gets(buf);
 921                 if (buf[0] == '3') {
 922                         serv_printf("PASS %s", c_password);
 923                         serv_gets(buf);
 924                         if (buf[0] == '2') {
 925                                 become_logged_in(c_username, c_password, buf);
 926                         }
 927                 }
 928         }
 929         /*
 930          * If we don't have a current room, but a cookie specifying the
 931          * current room is supplied, make an effort to go there.
 932          */
 933         if ((strlen(WC->wc_roomname) == 0) && (strlen(c_roomname) > 0)) {
 934                 serv_printf("GOTO %s", c_roomname);
 935                 serv_gets(buf);
 936                 if (buf[0] == '2') {
 937                         strcpy(WC->wc_roomname, c_roomname);
 938                 }
 939         }
 940
 941         if (!strcasecmp(action, "image")) {
 942                 output_image();
 943
 944         /*
 945          * All functions handled below this point ... make sure we log in
 946          * before doing anything else!
 947          */
 948         } else if ((!WC->logged_in) && (!strcasecmp(action, "login"))) {
 949                 do_login();
 950         } else if (!WC->logged_in) {
 951                 display_login(NULL);
 952         }
 953
 954         /*
 955          * Various commands...
 956          */
 957
 958         else if (!strcasecmp(action, "do_welcome")) {
 959                 do_welcome();
 960         } else if (!strcasecmp(action, "blank")) {
 961                 blank_page();
 962         } else if (!strcasecmp(action, "do_template")) {
 963                 url_do_template();
 964         } else if (!strcasecmp(action, "display_main_menu")) {
 965                 display_main_menu();
 966         } else if (!strcasecmp(action, "whobbs")) {
 967                 whobbs();
 968         } else if (!strcasecmp(action, "knrooms")) {
 969                 knrooms();
 970         } else if (!strcasecmp(action, "gotonext")) {
 971                 slrp_highest();
 972                 gotonext();
 973         } else if (!strcasecmp(action, "skip")) {
 974                 gotonext();
 975         } else if (!strcasecmp(action, "ungoto")) {
 976                 ungoto();
 977         } else if (!strcasecmp(action, "dotgoto")) {
 978                 slrp_highest();
 979                 smart_goto(bstr("room"));
 980         } else if (!strcasecmp(action, "dotskip")) {
 981                 smart_goto(bstr("room"));
 982         } else if (!strcasecmp(action, "termquit")) {
 983                 do_logout();
 984         } else if (!strcasecmp(action, "readnew")) {
 985                 readloop("readnew");
 986         } else if (!strcasecmp(action, "readold")) {
 987                 readloop("readold");
 988         } else if (!strcasecmp(action, "readfwd")) {
 989                 readloop("readfwd");
 990         } else if (!strcasecmp(action, "headers")) {
 991                 readloop("headers");
 992         } else if (!strcasecmp(action, "display_enter")) {
 993                 display_enter();
 994         } else if (!strcasecmp(action, "post")) {
 995                 post_message();
 996         } else if (!strcasecmp(action, "delete_msg")) {
 997                 delete_msg();
 998         } else if (!strcasecmp(action, "confirm_move_msg")) {
 999                 confirm_move_msg();
1000         } else if (!strcasecmp(action, "move_msg")) {
1001                 move_msg();
1002         } else if (!strcasecmp(action, "userlist")) {
1003                 userlist();
1004         } else if (!strcasecmp(action, "showuser")) {
1005                 showuser();
1006         } else if (!strcasecmp(action, "display_page")) {
1007                 display_page();
1008         } else if (!strcasecmp(action, "page_user")) {
1009                 page_user();
1010         } else if (!strcasecmp(action, "chat")) {
1011                 do_chat();
1012         } else if (!strcasecmp(action, "display_private")) {
1013                 display_private("", 0);
1014         } else if (!strcasecmp(action, "goto_private")) {
1015                 goto_private();
1016         } else if (!strcasecmp(action, "zapped_list")) {
1017                 zapped_list();
1018         } else if (!strcasecmp(action, "display_zap")) {
1019                 display_zap();
1020         } else if (!strcasecmp(action, "zap")) {
1021                 zap();
1022         } else if (!strcasecmp(action, "display_entroom")) {
1023                 display_entroom();
1024         } else if (!strcasecmp(action, "entroom")) {
1025                 entroom();
1026         } else if (!strcasecmp(action, "display_editroom")) {
1027                 display_editroom();
1028         } else if (!strcasecmp(action, "netedit")) {
1029                 netedit();
1030         } else if (!strcasecmp(action, "editroom")) {
1031                 editroom();
1032         } else if (!strcasecmp(action, "display_whok")) {
1033                 display_whok();
1034         } else if (!strcasecmp(action, "display_editinfo")) {
1035                 display_edit("Room info", "EINF 0", "RINF", "/editinfo", 1);
1036         } else if (!strcasecmp(action, "editinfo")) {
1037                 save_edit("Room info", "EINF 1", 1);
1038         } else if (!strcasecmp(action, "display_editbio")) {
1039                 sprintf(buf, "RBIO %s", WC->wc_username);
1040                 display_edit("Your bio", "NOOP", buf, "editbio", 3);
1041         } else if (!strcasecmp(action, "editbio")) {
1042                 save_edit("Your bio", "EBIO", 0);
1043         } else if (!strcasecmp(action, "confirm_delete_room")) {
1044                 confirm_delete_room();
1045         } else if (!strcasecmp(action, "delete_room")) {
1046                 delete_room();
1047         } else if (!strcasecmp(action, "validate")) {
1048                 validate();
1049         } else if (!strcasecmp(action, "display_editpic")) {
1050                 display_graphics_upload("your photo",
1051                                         "UIMG 0|_userpic_",
1052                                         "/editpic");
1053         } else if (!strcasecmp(action, "editpic")) {
1054                 do_graphics_upload("UIMG 1|_userpic_");
1055         } else if (!strcasecmp(action, "display_editroompic")) {
1056                 display_graphics_upload("the graphic for this room",
1057                                         "UIMG 0|_roompic_",
1058                                         "/editroompic");
1059         } else if (!strcasecmp(action, "editroompic")) {
1060                 do_graphics_upload("UIMG 1|_roompic_");
1061         } else if (!strcasecmp(action, "delete_floor")) {
1062                 delete_floor();
1063         } else if (!strcasecmp(action, "rename_floor")) {
1064                 rename_floor();
1065         } else if (!strcasecmp(action, "create_floor")) {
1066                 create_floor();
1067         } else if (!strcasecmp(action, "display_editfloorpic")) {
1068                 sprintf(buf, "UIMG 0|_floorpic_|%s",
1069                         bstr("which_floor"));
1070                 display_graphics_upload("the graphic for this floor",
1071                                         buf,
1072                                         "/editfloorpic");
1073         } else if (!strcasecmp(action, "editfloorpic")) {
1074                 sprintf(buf, "UIMG 1|_floorpic_|%s",
1075                         bstr("which_floor"));
1076                 do_graphics_upload(buf);
1077         } else if (!strcasecmp(action, "display_reg")) {
1078                 display_reg(0);
1079         } else if (!strcasecmp(action, "display_changepw")) {
1080                 display_changepw();
1081         } else if (!strcasecmp(action, "changepw")) {
1082                 changepw();
1083         } else if (!strcasecmp(action, "display_edit_node")) {
1084                 display_edit_node();
1085         } else if (!strcasecmp(action, "edit_node")) {
1086                 edit_node();
1087         } else if (!strcasecmp(action, "display_netconf")) {
1088                 display_netconf();
1089         } else if (!strcasecmp(action, "display_confirm_delete_node")) {
1090                 display_confirm_delete_node();
1091         } else if (!strcasecmp(action, "delete_node")) {
1092                 delete_node();
1093         } else if (!strcasecmp(action, "display_add_node")) {
1094                 display_add_node();
1095         } else if (!strcasecmp(action, "add_node")) {
1096                 add_node();
1097         } else if (!strcasecmp(action, "terminate_session")) {
1098                 slrp_highest();
1099                 terminate_session();
1100         } else if (!strcasecmp(action, "edit_me")) {
1101                 edit_me();
1102         } else if (!strcasecmp(action, "display_siteconfig")) {
1103                 display_siteconfig();
1104         } else if (!strcasecmp(action, "page_popup")) {
1105                 page_popup();
1106         } else if (!strcasecmp(action, "siteconfig")) {
1107                 siteconfig();
1108         } else if (!strcasecmp(action, "display_generic")) {
1109                 display_generic();
1110         } else if (!strcasecmp(action, "do_generic")) {
1111                 do_generic();
1112         } else if (!strcasecmp(action, "display_menubar")) {
1113                 display_menubar(1);
1114         } else if (!strcasecmp(action, "output_mimepart")) {
1115                 output_mimepart();
1116         } else if (!strcasecmp(action, "edit_vcard")) {
1117                 edit_vcard();
1118         } else if (!strcasecmp(action, "submit_vcard")) {
1119                 submit_vcard();
1120         } else if (!strcasecmp(action, "select_user_to_edit")) {
1121                 select_user_to_edit(NULL, NULL);
1122         } else if (!strcasecmp(action, "display_edituser")) {
1123                 display_edituser(NULL);
1124         } else if (!strcasecmp(action, "edituser")) {
1125                 edituser();
1126         } else if (!strcasecmp(action, "create_user")) {
1127                 create_user();
1128         } else if (!strcasecmp(action, "changeview")) {
1129                 change_view();
1130         } else if (!strcasecmp(action, "do_stuff_to_msgs")) {
1131                 do_stuff_to_msgs();
1132         } else if (!strcasecmp(action, "change_start_page")) {
1133                 change_start_page();
1134         } else if (!strcasecmp(action, "display_floorconfig")) {
1135                 display_floorconfig(NULL);
1136         } else if (!strcasecmp(action, "toggle_self_service")) {
1137                 toggle_self_service();
1138 #ifdef WEBCIT_WITH_CALENDAR_SERVICE
1139         } else if (!strcasecmp(action, "display_edit_task")) {
1140                 display_edit_task();
1141         } else if (!strcasecmp(action, "save_task")) {
1142                 save_task();
1143         } else if (!strcasecmp(action, "display_edit_event")) {
1144                 display_edit_event();
1145         } else if (!strcasecmp(action, "save_event")) {
1146                 save_event();
1147         } else if (!strcasecmp(action, "respond_to_request")) {
1148                 respond_to_request();
1149         } else if (!strcasecmp(action, "handle_rsvp")) {
1150                 handle_rsvp();
1151 #endif
1152         } else if (!strcasecmp(action, "summary")) {
1153                 summary();
1154         } else if (!strcasecmp(action, "diagnostics")) {
1155                 output_headers(1);
1156
1157                 wprintf("You're in session %d<HR>\n", WC->wc_session);
1158                 wprintf("Command: <BR><PRE>\n");
1159                 escputs(cmd);
1160                 wprintf("</PRE><HR>\n");
1161                 wprintf("Variables: <BR><PRE>\n");
1162                 dump_vars();
1163                 wprintf("</PRE><HR>\n");
1164                 wDumpContent(1);
1165         }
1166         /* When all else fais, display the main menu. */
1167         else {
1168                 display_main_menu();
1169         }
1170
1171 SKIP_ALL_THIS_CRAP:
1172         fflush(stdout);
1173         if (content != NULL) {
1174                 free(content);
1175                 content = NULL;
1176         }
1177         free_urls();
1178         if (WC->upload_length > 0) {
1179                 free(WC->upload);
1180                 WC->upload_length = 0;
1181         }
1182
1183 }