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         stuff_to_cookie(cookie, WC->wc_session, WC->wc_username,
 308                         WC->wc_password, WC->wc_roomname);
 309         if (print_standard_html_head == 2) {
 310                 wprintf("Set-cookie: webcit=%s\n", unset);
 311         } else {
 312                 wprintf("Set-cookie: webcit=%s\n", cookie);
 313                 if (server_cookie != NULL) {
 314                         wprintf("%s\n", server_cookie);
 315                 }
 316         }
 317
 318         if (print_standard_html_head > 0) {
 319                 wprintf("\n");
 320
 321                 if (refresh30) svprintf("REFRESHTAG", WCS_STRING,
 322                         "<META HTTP-EQUIV=\"refresh\" CONTENT=\"30\">\n");
 323                 else svprintf("REFRESHTAG", WCS_STRING,
 324                         "<META HTTP-EQUIV=\"refresh\" CONTENT=\"500363689;\">\n");
 325                 /* script for checking for pages (not always launched) */
 326                 svprintf("PAGERSCRIPT", WCS_STRING,
 327                         "<SCRIPT LANGUAGE=\"JavaScript\">\n"
 328                         "function launch_page_popup() {\n"
 329                         "pwin = window.open('/page_popup', 'CitaPage%d', "
 330                         "'toolbar=no,location=no,copyhistory=no,status=no,"
 331                         "scrollbars=yes,resizable=no,height=250,width=400');\n"
 332                         "}\n"
 333                         "</SCRIPT>\n",
 334                         ++pageseq
 335                 );
 336                 /* end script */
 337
 338                 do_template("head");
 339                 clear_local_substs();
 340
 341                 if (!suppress_check) if (WC->HaveExpressMessages) {
 342                         svprintf("extrabodyparms", WCS_STRING, "%s",
 343                                 "onload=\"launch_page_popup()\" ");
 344                         WC->HaveExpressMessages = 0;
 345                 }
 346
 347                 do_template("background");
 348                 clear_local_substs();
 349
 350         if (print_standard_html_head == 1) {
 351                 wprintf("<A NAME=\"TheTop\"></A>");
 352
 353                 embed_room_banner(NULL);
 354
 355                 }
 356         }
 357 }
 358
 359
 360 /*
 361  *
 362  */
 363 void http_redirect(char *whichpage) {
 364         wprintf("HTTP/1.0 302 Moved Temporarily\n");
 365         wprintf("Location: %s\n", whichpage);
 366         wprintf("URI: %s\n", whichpage);
 367         wprintf("Content-type: text/html\n\n");
 368         wprintf("<html><body>\n");
 369         wprintf("you really want to be <A HREF=\"%s\">here</A> now\n",
 370                 whichpage);
 371         wprintf("</body></html>\n");
 372 }
 373
 374
 375
 376 void check_for_express_messages()
 377 {
 378         char buf[SIZ];
 379
 380         serv_puts("NOOP");
 381         serv_gets(buf);
 382         if (buf[3] == '*') WC->HaveExpressMessages = 1;
 383 }
 384
 385
 386
 387
 388 /*
 389  * Output a piece of content to the web browser
 390  */
 391 void http_transmit_thing(char *thing, size_t length, char *content_type) {
 392         output_headers(0);
 393         wprintf("Content-type: %s\n"
 394                 "Content-length: %ld\n"
 395                 "Server: %s\n"
 396                 "Connection: close\n"
 397                 "\n",
 398                 content_type,
 399                 (long) length,
 400                 SERVER
 401         );
 402         write(WC->http_sock, thing, (size_t)length);
 403 }
 404
 405
 406
 407
 408 void output_static(char *what)
 409 {
 410         char buf[4096];
 411         FILE *fp;
 412         struct stat statbuf;
 413         off_t bytes;
 414         char *bigbuffer;
 415         char content_type[SIZ];
 416
 417         lprintf(9, "output_static(%s)\n", what);
 418         sprintf(buf, "static/%s", what);
 419         fp = fopen(buf, "rb");
 420         if (fp == NULL) {
 421                 wprintf("HTTP/1.0 404 %s\n", strerror(errno));
 422                 wprintf("Content-Type: text/plain\n");
 423                 wprintf("\n");
 424                 wprintf("Cannot open %s: %s\n", what, strerror(errno));
 425         } else {
 426                 if (!strncasecmp(&what[strlen(what) - 4], ".gif", 4))
 427                         strcpy(content_type, "image/gif");
 428                 else if (!strncasecmp(&what[strlen(what) - 4], ".txt", 4))
 429                         strcpy(content_type, "text/plain");
 430                 else if (!strncasecmp(&what[strlen(what) - 4], ".css", 4))
 431                         strcpy(content_type, "text/css");
 432                 else if (!strncasecmp(&what[strlen(what) - 4], ".jpg", 4))
 433                         strcpy(content_type, "image/jpeg");
 434                 else if (!strncasecmp(&what[strlen(what) - 4], ".png", 4))
 435                         strcpy(content_type, "image/png");
 436                 else if (!strncasecmp(&what[strlen(what) - 5], ".html", 5))
 437                         strcpy(content_type, "text/html");
 438                 else if (!strncasecmp(&what[strlen(what) - 4], ".wml", 4))
 439                         strcpy(content_type, "text/vnd.wap.wml");
 440                 else if (!strncasecmp(&what[strlen(what) - 5], ".wmls", 5))
 441                         strcpy(content_type, "text/vnd.wap.wmlscript");
 442                 else if (!strncasecmp(&what[strlen(what) - 5], ".wmlc", 5))
 443                         strcpy(content_type, "application/vnd.wap.wmlc");
 444                 else if (!strncasecmp(&what[strlen(what) - 6], ".wmlsc", 6))
 445                         strcpy(content_type, "application/vnd.wap.wmlscriptc");
 446                 else if (!strncasecmp(&what[strlen(what) - 5], ".wbmp", 5))
 447                         wprintf("Content-type: image/vnd.wap.wbmp");
 448                 else
 449                         wprintf("Content-type: application/octet-stream");
 450
 451                 fstat(fileno(fp), &statbuf);
 452                 bytes = statbuf.st_size;
 453                 lprintf(3, "Static: %s, %ld bytes\n", what, bytes);
 454                 bigbuffer = malloc(bytes);
 455                 fread(bigbuffer, bytes, 1, fp);
 456                 fclose(fp);
 457
 458                 http_transmit_thing(bigbuffer, (size_t)bytes, content_type);
 459                 free(bigbuffer);
 460         }
 461         if (!strcasecmp(bstr("force_close_session"), "yes")) {
 462                 end_webcit_session();
 463         }
 464 }
 465
 466
 467 /*
 468  * When the browser requests an image file from the Citadel server,
 469  * this function is called to transmit it.
 470  */
 471 void output_image()
 472 {
 473         char buf[SIZ];
 474         char *xferbuf = NULL;
 475         off_t bytes;
 476
 477         serv_printf("OIMG %s|%s", bstr("name"), bstr("parm"));
 478         serv_gets(buf);
 479         if (buf[0] == '2') {
 480                 bytes = extract_long(&buf[4], 0);
 481                 xferbuf = malloc(bytes);
 482
 483                 /* Read it from the server */
 484                 read_server_binary(xferbuf, bytes);
 485                 serv_puts("CLOS");
 486                 serv_gets(buf);
 487
 488                 /* Write it to the browser */
 489                 http_transmit_thing(xferbuf, (size_t)bytes, "image/gif");
 490                 free(xferbuf);
 491
 492         } else {
 493
 494                 /* Instead of an ugly 404, send a 1x1 transparent GIF
 495                  * when there's no such image on the server.
 496                  */
 497                 output_static("blank.gif");
 498
 499                 /*
 500                 wprintf("HTTP/1.0 404 %s\n", &buf[4]);
 501                 output_headers(0);
 502                 wprintf("Content-Type: text/plain\n"
 503                         "\n"
 504                         "Error retrieving image: %s\n",
 505                         &buf[4]
 506                 );
 507                 */
 508
 509         }
 510
 511
 512
 513 }
 514
 515 /*
 516  */
 517 void output_mimepart()
 518 {
 519         char buf[SIZ];
 520         off_t bytes;
 521         char content_type[SIZ];
 522         char *content = NULL;
 523
 524         serv_printf("OPNA %s|%s", bstr("msgnum"), bstr("partnum"));
 525         serv_gets(buf);
 526         if (buf[0] == '2') {
 527                 bytes = extract_long(&buf[4], 0);
 528                 content = malloc(bytes);
 529                 extract(content_type, &buf[4], 3);
 530                 output_headers(0);
 531                 read_server_binary(content, bytes);
 532                 serv_puts("CLOS");
 533                 serv_gets(buf);
 534                 http_transmit_thing(content, bytes, content_type);
 535                 free(content);
 536         } else {
 537                 wprintf("HTTP/1.0 404 %s\n", &buf[4]);
 538                 output_headers(0);
 539                 wprintf("Content-Type: text/plain\n");
 540                 wprintf("\n");
 541                 wprintf("Error retrieving part: %s\n", &buf[4]);
 542         }
 543
 544 }
 545
 546
 547 /*
 548  */
 549 char *load_mimepart(long msgnum, char *partnum)
 550 {
 551         char buf[SIZ];
 552         off_t bytes;
 553         char content_type[SIZ];
 554         char *content;
 555
 556         serv_printf("OPNA %ld|%s", msgnum, partnum);
 557         serv_gets(buf);
 558         if (buf[0] == '2') {
 559                 bytes = extract_long(&buf[4], 0);
 560                 extract(content_type, &buf[4], 3);
 561
 562                 content = malloc(bytes + 1);
 563                 read_server_binary(content, bytes);
 564
 565                 serv_puts("CLOS");
 566                 serv_gets(buf);
 567                 content[bytes] = 0;     /* null terminate for good measure */
 568                 return(content);
 569         }
 570         else {
 571                 return(NULL);
 572         }
 573
 574 }
 575
 576
 577 /*
 578  * Convenience functions to display a page containing only a string
 579  */
 580 void convenience_page(char *titlebarcolor, char *titlebarmsg, char *messagetext)
 581 {
 582         wprintf("HTTP/1.0 200 OK\n");
 583         output_headers(1);
 584         wprintf("<TABLE WIDTH=100%% BORDER=0 BGCOLOR=%s><TR><TD>", titlebarcolor);
 585         wprintf("<FONT SIZE=+1 COLOR=\"FFFFFF\"");
 586         wprintf("<B>%s</B>\n", titlebarmsg);
 587         wprintf("</FONT></TD></TR></TABLE><BR>\n");
 588         escputs(messagetext);
 589
 590         wprintf("<HR>\n");
 591         wDumpContent(1);
 592 }
 593
 594
 595 /*
 596  * Display a blank page.
 597  */
 598 void blank_page(void) {
 599         output_headers(7);
 600         wDumpContent(2);
 601 }
 602
 603
 604
 605
 606 /*
 607  * Offer to make any page the user's "start page."
 608  */
 609 void offer_start_page(void) {
 610         wprintf("<A HREF=\"/change_start_page?startpage=");
 611         urlescputs(WC->this_page);
 612         wprintf("\">"
 613                 "<FONT SIZE=-2 COLOR=#AAAAAA>Make this my start page</FONT>"
 614                 "</A>"
 615         );
 616 }
 617
 618
 619 /*
 620  * Change the user's start page
 621  */
 622 void change_start_page(void) {
 623
 624         if (bstr("startpage") == NULL) {
 625                 display_error("startpage set to null");
 626                 return;
 627         }
 628
 629         set_preference("startpage", bstr("startpage"));
 630
 631         output_headers(3);
 632         do_template("newstartpage");
 633         wDumpContent(1);
 634 }
 635
 636
 637
 638
 639 void display_error(char *errormessage)
 640 {
 641         convenience_page("770000", "Error", errormessage);
 642 }
 643
 644 void display_success(char *successmessage)
 645 {
 646         convenience_page("007700", "OK", successmessage);
 647 }
 648
 649
 650
 651 void extract_action(char *actbuf, char *cmdbuf)
 652 {
 653         int i;
 654
 655         strcpy(actbuf, cmdbuf);
 656         if (!strncasecmp(actbuf, "GET /", 5))
 657                 strcpy(actbuf, &actbuf[5]);
 658         if (!strncasecmp(actbuf, "PUT /", 5))
 659                 strcpy(actbuf, &actbuf[5]);
 660         if (!strncasecmp(actbuf, "POST /", 6))
 661                 strcpy(actbuf, &actbuf[6]);
 662
 663         for (i = 0; i < strlen(actbuf); ++i) {
 664                 if (actbuf[i] == ' ') {
 665                         actbuf[i] = 0;
 666                         i = 0;
 667                 }
 668                 if (actbuf[i] == '/') {
 669                         actbuf[i] = 0;
 670                         i = 0;
 671                 }
 672                 if (actbuf[i] == '?') {
 673                         actbuf[i] = 0;
 674                         i = 0;
 675                 }
 676                 if (actbuf[i] == '&') {
 677                         actbuf[i] = 0;
 678                         i = 0;
 679                 }
 680         }
 681 }
 682
 683
 684 void upload_handler(char *name, char *filename, char *partnum, char *disp,
 685                         void *content, char *cbtype, size_t length,
 686                         char *encoding, void *userdata)
 687 {
 688
 689         lprintf(5, "UPLOAD HANDLER CALLED\n");
 690         lprintf(5, "    name = %s\n", name);
 691         lprintf(5, "filename = %s\n", filename);
 692         lprintf(5, "encoding = %s\n", encoding);
 693         lprintf(5, "    type = %s\n", cbtype);
 694         lprintf(5, "  length = %ld\n", (long)length);
 695
 696         if (length > 0) {
 697                 WC->upload = malloc(length);
 698                 if (WC->upload != NULL) {
 699                         WC->upload_length = length;
 700                         memcpy(WC->upload, content, length);
 701                 }
 702                 else {
 703                         lprintf(9, "malloc() failed: %s\n",
 704                                 strerror(errno));
 705                 }
 706         }
 707 }
 708
 709
 710
 711
 712 /*
 713  * Entry point for WebCit transaction
 714  */
 715 void session_loop(struct httprequest *req)
 716 {
 717         char cmd[SIZ];
 718         char action[SIZ];
 719         char buf[SIZ];
 720         int a, b;
 721         int ContentLength = 0;
 722         int BytesRead;
 723         char ContentType[512];
 724         char *content;
 725         char *content_end;
 726         struct httprequest *hptr;
 727         char browser_host[SIZ];
 728         char user_agent[SIZ];
 729
 730         /* We stuff these with the values coming from the client cookies,
 731          * so we can use them to reconnect a timed out session if we have to.
 732          */
 733         char c_host[SIZ];
 734         char c_port[SIZ];
 735         char c_username[SIZ];
 736         char c_password[SIZ];
 737         char c_roomname[SIZ];
 738         char cookie[SIZ];
 739
 740         strcpy(c_host, defaulthost);
 741         strcpy(c_port, defaultport);
 742         strcpy(c_username, "");
 743         strcpy(c_password, "");
 744         strcpy(c_roomname, "");
 745
 746         WC->upload_length = 0;
 747         WC->upload = NULL;
 748
 749         WC->is_wap = 0;
 750
 751         hptr = req;
 752         if (hptr == NULL) return;
 753
 754         strcpy(cmd, hptr->line);
 755         hptr = hptr->next;
 756         extract_action(action, cmd);
 757
 758         while (hptr != NULL) {
 759                 strcpy(buf, hptr->line);
 760                 hptr = hptr->next;
 761
 762                 if (!strncasecmp(buf, "Cookie: webcit=", 15)) {
 763                         strcpy(cookie, &buf[15]);
 764                         cookie_to_stuff(cookie, NULL,
 765                                       c_username, c_password, c_roomname);
 766                 }
 767                 else if (!strncasecmp(buf, "Content-length: ", 16)) {
 768                         ContentLength = atoi(&buf[16]);
 769                 }
 770                 else if (!strncasecmp(buf, "Content-type: ", 14)) {
 771                         safestrncpy(ContentType, &buf[14], sizeof ContentType);
 772                 }
 773                 else if (!strncasecmp(buf, "User-agent: ", 12)) {
 774                         safestrncpy(user_agent, &buf[12], sizeof user_agent);
 775                 }
 776                 else if (!strncasecmp(buf, "Host: ", 6)) {
 777                         safestrncpy(WC->http_host, &buf[6], sizeof WC->http_host);
 778                 }
 779                 /* Only WAP gateways explicitly name this content-type */
 780                 else if (strstr(buf, "text/vnd.wap.wml")) {
 781                         WC->is_wap = 1;
 782                 }
 783         }
 784
 785         if (ContentLength > 0) {
 786                 lprintf(5, "Content length: %d\n", ContentLength);
 787                 content = malloc(ContentLength + 1);
 788                 memset(content, 0, ContentLength+1);
 789                 BytesRead = 0;
 790
 791                 while (BytesRead < ContentLength) {
 792                         a=read(WC->http_sock, &content[BytesRead],
 793                                 ContentLength - BytesRead);
 794                         if (a <= 0) BytesRead = ContentLength;
 795                         else BytesRead += a;
 796                 }
 797
 798                 if (!strncasecmp(ContentType,
 799                               "application/x-www-form-urlencoded", 33)) {
 800                         addurls(content);
 801                 } else if (!strncasecmp(ContentType, "multipart", 9)) {
 802                         content_end = content + ContentLength;
 803                         mime_parser(content, content_end, *upload_handler,
 804                                         NULL, NULL, NULL, 0);
 805                 }
 806         } else {
 807                 content = NULL;
 808         }
 809
 810         /* make a note of where we are in case the user wants to save it */
 811         safestrncpy(WC->this_page, cmd, sizeof(WC->this_page));
 812         remove_token(WC->this_page, 2, ' ');
 813         remove_token(WC->this_page, 0, ' ');
 814
 815         /* If there are variables in the URL, we must grab them now */
 816         for (a = 0; a < strlen(cmd); ++a) {
 817                 if ((cmd[a] == '?') || (cmd[a] == '&')) {
 818                         for (b = a; b < strlen(cmd); ++b)
 819                                 if (isspace(cmd[b]))
 820                                         cmd[b] = 0;
 821                         addurls(&cmd[a + 1]);
 822                         cmd[a] = 0;
 823                 }
 824         }
 825
 826         /*
 827          * If we're not connected to a Citadel server, try to hook up the
 828          * connection now.  Preference is given to the host and port specified
 829          * by browser cookies, if cookies have been supplied.
 830          */
 831         if (!WC->connected) {
 832                 if (strlen(bstr("host")) > 0)
 833                         strcpy(c_host, bstr("host"));
 834                 if (strlen(bstr("port")) > 0)
 835                         strcpy(c_port, bstr("port"));
 836
 837                 if (!strcasecmp(c_host, "uds")) {
 838                         /* unix domain socket */
 839                         sprintf(buf, "%s/citadel.socket", c_port);
 840                         WC->serv_sock = uds_connectsock(buf);
 841                 }
 842                 else {
 843                         /* tcp socket */
 844                         WC->serv_sock = tcp_connectsock(c_host, c_port);
 845                 }
 846
 847                 if (WC->serv_sock < 0) {
 848                         do_logout();
 849                         goto SKIP_ALL_THIS_CRAP;
 850                 }
 851                 else {
 852                         WC->connected = 1;
 853                         serv_gets(buf); /* get the server welcome message */
 854                         locate_host(browser_host, WC->http_sock);
 855                         get_serv_info(browser_host, user_agent);
 856                         if (serv_info.serv_rev_level < MINIMUM_CIT_VERSION) {
 857                                 wprintf("You are connected to a Citadel "
 858                                         "server running Citadel %d.%02d;\nin "
 859                                         "order to run this version of WebCit "
 860                                         "you must also have Citadel %d.%02d or"
 861                                         " newer.\n\n\n",
 862                                                 serv_info.serv_rev_level / 100,
 863                                                 serv_info.serv_rev_level % 100,
 864                                                 MINIMUM_CIT_VERSION / 100,
 865                                                 MINIMUM_CIT_VERSION % 100
 866                                         );
 867                                 end_webcit_session();
 868                                 goto SKIP_ALL_THIS_CRAP;
 869                         }
 870                 }
 871         }
 872
 873         /*
 874          * Functions which can be performed without logging in
 875          */
 876         if (!strcasecmp(action, "listsub")) {
 877                 do_listsub();
 878                 goto SKIP_ALL_THIS_CRAP;
 879         }
 880
 881         check_for_express_messages();
 882
 883         /*
 884          * If we're not logged in, but we have username and password cookies
 885          * supplied by the browser, try using them to log in.
 886          */
 887         if ((!WC->logged_in) && (strlen(c_username) > 0) && (strlen(c_password) > 0)) {
 888                 serv_printf("USER %s", c_username);
 889                 serv_gets(buf);
 890                 if (buf[0] == '3') {
 891                         serv_printf("PASS %s", c_password);
 892                         serv_gets(buf);
 893                         if (buf[0] == '2') {
 894                                 become_logged_in(c_username, c_password, buf);
 895                         }
 896                 }
 897         }
 898         /*
 899          * If we don't have a current room, but a cookie specifying the
 900          * current room is supplied, make an effort to go there.
 901          */
 902         if ((strlen(WC->wc_roomname) == 0) && (strlen(c_roomname) > 0)) {
 903                 serv_printf("GOTO %s", c_roomname);
 904                 serv_gets(buf);
 905                 if (buf[0] == '2') {
 906                         strcpy(WC->wc_roomname, c_roomname);
 907                 }
 908         }
 909         if (!strcasecmp(action, "static")) {
 910                 strcpy(buf, &cmd[12]);
 911                 for (a = 0; a < strlen(buf); ++a)
 912                         if (isspace(buf[a]))
 913                                 buf[a] = 0;
 914                 output_static(buf);
 915         } else if (!strcasecmp(action, "image")) {
 916                 output_image();
 917
 918         /*
 919          * All functions handled below this point ... make sure we log in
 920          * before doing anything else!
 921          */
 922         } else if ((!WC->logged_in) && (!strcasecmp(action, "login"))) {
 923                 do_login();
 924         } else if (!WC->logged_in) {
 925                 display_login(NULL);
 926         }
 927
 928         /*
 929          * Various commands...
 930          */
 931
 932         else if (!strcasecmp(action, "do_welcome")) {
 933                 do_welcome();
 934         } else if (!strcasecmp(action, "blank")) {
 935                 blank_page();
 936         } else if (!strcasecmp(action, "display_main_menu")) {
 937                 display_main_menu();
 938         } else if (!strcasecmp(action, "whobbs")) {
 939                 whobbs();
 940         } else if (!strcasecmp(action, "knrooms")) {
 941                 knrooms();
 942         } else if (!strcasecmp(action, "gotonext")) {
 943                 slrp_highest();
 944                 gotonext();
 945         } else if (!strcasecmp(action, "skip")) {
 946                 gotonext();
 947         } else if (!strcasecmp(action, "ungoto")) {
 948                 ungoto();
 949         } else if (!strcasecmp(action, "dotgoto")) {
 950                 slrp_highest();
 951                 smart_goto(bstr("room"));
 952         } else if (!strcasecmp(action, "dotskip")) {
 953                 smart_goto(bstr("room"));
 954         } else if (!strcasecmp(action, "termquit")) {
 955                 do_logout();
 956         } else if (!strcasecmp(action, "readnew")) {
 957                 readloop("readnew");
 958         } else if (!strcasecmp(action, "readold")) {
 959                 readloop("readold");
 960         } else if (!strcasecmp(action, "readfwd")) {
 961                 readloop("readfwd");
 962         } else if (!strcasecmp(action, "headers")) {
 963                 readloop("headers");
 964         } else if (!strcasecmp(action, "display_enter")) {
 965                 display_enter();
 966         } else if (!strcasecmp(action, "post")) {
 967                 post_message();
 968         } else if (!strcasecmp(action, "delete_msg")) {
 969                 delete_msg();
 970         } else if (!strcasecmp(action, "confirm_move_msg")) {
 971                 confirm_move_msg();
 972         } else if (!strcasecmp(action, "move_msg")) {
 973                 move_msg();
 974         } else if (!strcasecmp(action, "userlist")) {
 975                 userlist();
 976         } else if (!strcasecmp(action, "showuser")) {
 977                 showuser();
 978         } else if (!strcasecmp(action, "display_page")) {
 979                 display_page();
 980         } else if (!strcasecmp(action, "page_user")) {
 981                 page_user();
 982         } else if (!strcasecmp(action, "chat")) {
 983                 do_chat();
 984         } else if (!strcasecmp(action, "display_private")) {
 985                 display_private("", 0);
 986         } else if (!strcasecmp(action, "goto_private")) {
 987                 goto_private();
 988         } else if (!strcasecmp(action, "zapped_list")) {
 989                 zapped_list();
 990         } else if (!strcasecmp(action, "display_zap")) {
 991                 display_zap();
 992         } else if (!strcasecmp(action, "zap")) {
 993                 zap();
 994         } else if (!strcasecmp(action, "display_entroom")) {
 995                 display_entroom();
 996         } else if (!strcasecmp(action, "entroom")) {
 997                 entroom();
 998         } else if (!strcasecmp(action, "display_editroom")) {
 999                 display_editroom();
1000         } else if (!strcasecmp(action, "netedit")) {
1001                 netedit();
1002         } else if (!strcasecmp(action, "editroom")) {
1003                 editroom();
1004         } else if (!strcasecmp(action, "display_whok")) {
1005                 display_whok();
1006         } else if (!strcasecmp(action, "display_editinfo")) {
1007                 display_edit("Room info", "EINF 0", "RINF", "/editinfo");
1008         } else if (!strcasecmp(action, "editinfo")) {
1009                 save_edit("Room info", "EINF 1", 1);
1010         } else if (!strcasecmp(action, "display_editbio")) {
1011                 sprintf(buf, "RBIO %s", WC->wc_username);
1012                 display_edit("Your bio", "NOOP", buf, "editbio");
1013         } else if (!strcasecmp(action, "editbio")) {
1014                 save_edit("Your bio", "EBIO", 0);
1015         } else if (!strcasecmp(action, "confirm_delete_room")) {
1016                 confirm_delete_room();
1017         } else if (!strcasecmp(action, "delete_room")) {
1018                 delete_room();
1019         } else if (!strcasecmp(action, "validate")) {
1020                 validate();
1021         } else if (!strcasecmp(action, "display_editpic")) {
1022                 display_graphics_upload("your photo",
1023                                         "UIMG 0|_userpic_",
1024                                         "/editpic");
1025         } else if (!strcasecmp(action, "editpic")) {
1026                 do_graphics_upload("UIMG 1|_userpic_");
1027         } else if (!strcasecmp(action, "display_editroompic")) {
1028                 display_graphics_upload("the graphic for this room",
1029                                         "UIMG 0|_roompic_",
1030                                         "/editroompic");
1031         } else if (!strcasecmp(action, "editroompic")) {
1032                 do_graphics_upload("UIMG 1|_roompic_");
1033         } else if (!strcasecmp(action, "delete_floor")) {
1034                 delete_floor();
1035         } else if (!strcasecmp(action, "rename_floor")) {
1036                 rename_floor();
1037         } else if (!strcasecmp(action, "create_floor")) {
1038                 create_floor();
1039         } else if (!strcasecmp(action, "display_editfloorpic")) {
1040                 sprintf(buf, "UIMG 0|_floorpic_|%s",
1041                         bstr("which_floor"));
1042                 display_graphics_upload("the graphic for this floor",
1043                                         buf,
1044                                         "/editfloorpic");
1045         } else if (!strcasecmp(action, "editfloorpic")) {
1046                 sprintf(buf, "UIMG 1|_floorpic_|%s",
1047                         bstr("which_floor"));
1048                 do_graphics_upload(buf);
1049         } else if (!strcasecmp(action, "display_reg")) {
1050                 display_reg(0);
1051         } else if (!strcasecmp(action, "display_changepw")) {
1052                 display_changepw();
1053         } else if (!strcasecmp(action, "changepw")) {
1054                 changepw();
1055         } else if (!strcasecmp(action, "display_edit_node")) {
1056                 display_edit_node();
1057         } else if (!strcasecmp(action, "edit_node")) {
1058                 edit_node();
1059         } else if (!strcasecmp(action, "display_netconf")) {
1060                 display_netconf();
1061         } else if (!strcasecmp(action, "display_confirm_delete_node")) {
1062                 display_confirm_delete_node();
1063         } else if (!strcasecmp(action, "delete_node")) {
1064                 delete_node();
1065         } else if (!strcasecmp(action, "display_add_node")) {
1066                 display_add_node();
1067         } else if (!strcasecmp(action, "add_node")) {
1068                 add_node();
1069         } else if (!strcasecmp(action, "terminate_session")) {
1070                 slrp_highest();
1071                 terminate_session();
1072         } else if (!strcasecmp(action, "edit_me")) {
1073                 edit_me();
1074         } else if (!strcasecmp(action, "display_siteconfig")) {
1075                 display_siteconfig();
1076         } else if (!strcasecmp(action, "page_popup")) {
1077                 page_popup();
1078         } else if (!strcasecmp(action, "siteconfig")) {
1079                 siteconfig();
1080         } else if (!strcasecmp(action, "display_generic")) {
1081                 display_generic();
1082         } else if (!strcasecmp(action, "do_generic")) {
1083                 do_generic();
1084         } else if (!strcasecmp(action, "display_menubar")) {
1085                 display_menubar(1);
1086         } else if (!strcasecmp(action, "output_mimepart")) {
1087                 output_mimepart();
1088         } else if (!strcasecmp(action, "edit_vcard")) {
1089                 edit_vcard();
1090         } else if (!strcasecmp(action, "submit_vcard")) {
1091                 submit_vcard();
1092         } else if (!strcasecmp(action, "select_user_to_edit")) {
1093                 select_user_to_edit(NULL, NULL);
1094         } else if (!strcasecmp(action, "display_edituser")) {
1095                 display_edituser(NULL);
1096         } else if (!strcasecmp(action, "edituser")) {
1097                 edituser();
1098         } else if (!strcasecmp(action, "create_user")) {
1099                 create_user();
1100         } else if (!strcasecmp(action, "changeview")) {
1101                 change_view();
1102         } else if (!strcasecmp(action, "folders")) {
1103                 folders();
1104         } else if (!strcasecmp(action, "do_stuff_to_msgs")) {
1105                 do_stuff_to_msgs();
1106         } else if (!strcasecmp(action, "change_start_page")) {
1107                 change_start_page();
1108         } else if (!strcasecmp(action, "display_floorconfig")) {
1109                 display_floorconfig(NULL);
1110         } else if (!strcasecmp(action, "toggle_self_service")) {
1111                 toggle_self_service();
1112 #ifdef WEBCIT_WITH_CALENDAR_SERVICE
1113         } else if (!strcasecmp(action, "display_edit_task")) {
1114                 display_edit_task();
1115         } else if (!strcasecmp(action, "save_task")) {
1116                 save_task();
1117         } else if (!strcasecmp(action, "display_edit_event")) {
1118                 display_edit_event();
1119         } else if (!strcasecmp(action, "save_event")) {
1120                 save_event();
1121         } else if (!strcasecmp(action, "respond_to_request")) {
1122                 respond_to_request();
1123         } else if (!strcasecmp(action, "handle_rsvp")) {
1124                 handle_rsvp();
1125 #endif
1126         } else if (!strcasecmp(action, "summary")) {
1127                 summary();
1128         } else if (!strcasecmp(action, "diagnostics")) {
1129                 output_headers(1);
1130
1131                 wprintf("You're in session %d<HR>\n", WC->wc_session);
1132                 wprintf("Command: <BR><PRE>\n");
1133                 escputs(cmd);
1134                 wprintf("</PRE><HR>\n");
1135                 wprintf("Variables: <BR><PRE>\n");
1136                 dump_vars();
1137                 wprintf("</PRE><HR>\n");
1138                 wDumpContent(1);
1139         }
1140         /* When all else fais, display the main menu. */
1141         else {
1142                 display_main_menu();
1143         }
1144
1145 SKIP_ALL_THIS_CRAP:
1146         fflush(stdout);
1147         if (content != NULL) {
1148                 free(content);
1149                 content = NULL;
1150         }
1151         free_urls();
1152         if (WC->upload_length > 0) {
1153                 free(WC->upload);
1154                 WC->upload_length = 0;
1155         }
1156
1157 }