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 #ifdef WITH_ZLIB
 156
 157 ssize_t http_write(int fd, void *buf, size_t count) {
 158
 159         if (WC->gzfd) {
 160                 return gzwrite(WC->gzfd, buf, count);
 161         }
 162         else {
 163                 return write(fd, buf, count);
 164         }
 165
 166
 167 }
 168
 169 #else
 170
 171 ssize_t http_write(int fd, const void *buf, size_t count) {
 172         return write(fd, buf, count);
 173 }
 174
 175 #endif
 176
 177
 178
 179
 180 void wprintf(const char *format,...)
 181 {
 182         va_list arg_ptr;
 183         char wbuf[1024];
 184
 185         va_start(arg_ptr, format);
 186         vsprintf(wbuf, format, arg_ptr);
 187         va_end(arg_ptr);
 188
 189         http_write(WC->http_sock, wbuf, strlen(wbuf));
 190 }
 191
 192
 193 /*
 194  * wDumpContent() wraps up an HTTP session, closes tags, etc.
 195  *
 196  * print_standard_html_footer should be set to 0 to transmit only, 1 to
 197  * append the main menu and closing tags, or 2 to
 198  * append the closing tags only.
 199  */
 200 void wDumpContent(int print_standard_html_footer)
 201 {
 202         if (WC->fake_frames) {
 203                 wprintf("</TABLE>\n");
 204                 WC->fake_frames = 0;
 205         }
 206
 207         if (print_standard_html_footer) {
 208                 if (print_standard_html_footer != 2) {
 209                         wprintf("<BR>");
 210                 }
 211                 wprintf("</BODY></HTML>\n");
 212         }
 213
 214
 215 }
 216
 217
 218 /*
 219  * Copy a string, escaping characters which have meaning in HTML.  If
 220  * nbsp is nonzero, spaces are converted to non-breaking spaces.
 221  */
 222 void stresc(char *target, char *strbuf, int nbsp)
 223 {
 224         int a;
 225         strcpy(target, "");
 226
 227         for (a = 0; a < strlen(strbuf); ++a) {
 228                 if (strbuf[a] == '<')
 229                         strcat(target, "&lt;");
 230                 else if (strbuf[a] == '>')
 231                         strcat(target, "&gt;");
 232                 else if (strbuf[a] == '&')
 233                         strcat(target, "&amp;");
 234                 else if (strbuf[a] == '\"')
 235                         strcat(target, "&quot;");
 236                 else if (strbuf[a] == '\'')
 237                         strcat(target, "&#39;");
 238                 else if (strbuf[a] == LB)
 239                         strcat(target, "<");
 240                 else if (strbuf[a] == RB)
 241                         strcat(target, ">");
 242                 else if (strbuf[a] == QU)
 243                         strcat(target, "\"");
 244                 else if ((strbuf[a] == 32) && (nbsp == 1)) {
 245                         strcat(target, "&nbsp;");
 246                 } else {
 247                         strncat(target, &strbuf[a], 1);
 248                 }
 249         }
 250 }
 251
 252 void escputs1(char *strbuf, int nbsp)
 253 {
 254         char buf[1024];
 255         stresc(buf, strbuf, nbsp);
 256         wprintf("%s", buf);
 257 }
 258
 259 void escputs(char *strbuf)
 260 {
 261         escputs1(strbuf, 0);
 262 }
 263
 264 /*
 265  * Escape a string for feeding out as a URL.
 266  * Returns a pointer to a buffer that must be freed by the caller!
 267  */
 268 void urlesc(char *outbuf, char *strbuf)
 269 {
 270         int a, b, c;
 271         char *ec = " #&;`'|*?-~<>^()[]{}$\\";
 272
 273         strcpy(outbuf, "");
 274
 275         for (a = 0; a < strlen(strbuf); ++a) {
 276                 c = 0;
 277                 for (b = 0; b < strlen(ec); ++b) {
 278                         if (strbuf[a] == ec[b])
 279                                 c = 1;
 280                 }
 281                 b = strlen(outbuf);
 282                 if (c == 1)
 283                         sprintf(&outbuf[b], "%%%02x", strbuf[a]);
 284                 else
 285                         sprintf(&outbuf[b], "%c", strbuf[a]);
 286         }
 287 }
 288
 289 void urlescputs(char *strbuf)
 290 {
 291         char outbuf[SIZ];
 292
 293         urlesc(outbuf, strbuf);
 294         wprintf("%s", outbuf);
 295 }
 296
 297
 298
 299
 300 /*
 301  * Output all that important stuff that the browser will want to see
 302  *
 303  * control codes:
 304  *
 305  * Bits 0 and 1:
 306  * 0 = Nothing.  Do not display any leading HTTP or HTML.
 307  * 1 = HTTP headers plus the room banner
 308  * 2 = HTTP headers required to terminate the session (unset cookies)
 309  * 3 = HTTP and HTML headers, but no room banner
 310  *
 311  * Bit 2: Set to 1 to auto-refresh page every 30 seconds
 312  *
 313  * Bit 3: suppress check for express messages
 314  */
 315 void output_headers(int controlcode)
 316 {
 317         char cookie[SIZ];
 318         int print_standard_html_head = 0;
 319         int refresh30 = 0;
 320         int suppress_check = 0;
 321         char httpnow[SIZ];
 322         static int pageseq = 0;
 323 #ifdef WITH_ZLIB
 324         gzFile temp_gzfd = NULL;
 325 #endif
 326
 327         print_standard_html_head        =       controlcode & 0x03;
 328         refresh30                       =       ((controlcode & 0x04) >> 2);
 329         suppress_check                  =       ((controlcode & 0x08) >> 3);
 330
 331         wprintf("HTTP/1.0 200 OK\n");
 332
 333         httpdate(httpnow, time(NULL));
 334
 335 #ifdef WITH_ZLIB
 336         if (WC->gzcompressed) {
 337                 temp_gzfd = gzdopen(WC->http_sock, "wb9");
 338         }
 339 #endif
 340
 341         if (print_standard_html_head > 0) {
 342                 wprintf("Content-type: text/html\n");
 343                 wprintf("Server: %s\n", SERVER);
 344                 wprintf("Connection: close\n");
 345                 wprintf("Pragma: no-cache\n");
 346                 wprintf("Cache-Control: no-store\n");
 347 #ifdef WITH_ZLIB
 348                 if (temp_gzfd != NULL) {
 349                         wprintf("Content-Encoding: gzip\n");
 350                 }
 351 #endif
 352         }
 353         stuff_to_cookie(cookie, WC->wc_session, WC->wc_username,
 354                         WC->wc_password, WC->wc_roomname);
 355         if (print_standard_html_head == 2) {
 356                 wprintf("Set-cookie: webcit=%s\n", unset);
 357         } else {
 358                 wprintf("Set-cookie: webcit=%s\n", cookie);
 359                 if (server_cookie != NULL) {
 360                         wprintf("%s\n", server_cookie);
 361                 }
 362         }
 363
 364         if (print_standard_html_head > 0) {
 365                 wprintf("\n");
 366
 367 #ifdef WITH_ZLIB
 368                 if (temp_gzfd != NULL) {
 369                         WC->gzfd = temp_gzfd;
 370                 }
 371 #endif
 372
 373                 wprintf("<HTML><HEAD><TITLE>");
 374                 escputs(serv_info.serv_humannode);
 375                 wprintf("</TITLE>\n"
 376                         "<META HTTP-EQUIV=\"Pragma\" CONTENT=\"no-cache\">\n"
 377                         "<META HTTP-EQUIV=\"expired\" CONTENT=\"28-May-1971 18:10:00 GMT\">\n"
 378                         "<META NAME=\"MSSmartTagsPreventParsing\" CONTENT=\"TRUE\">\n");
 379                 if (refresh30) wprintf(
 380                         "<META HTTP-EQUIV=\"refresh\" CONTENT=\"30\">\n");
 381                 else wprintf(
 382                         "<META HTTP-EQUIV=\"refresh\" CONTENT=\"500363689;\">\n");
 383                 wprintf("</HEAD>\n");
 384
 385                 /* script for checking for pages (not always launched) */
 386                 wprintf("<SCRIPT LANGUAGE=\"JavaScript\">\n");
 387                 wprintf("function launch_page_popup() {\n");
 388                 wprintf("pwin = window.open('/page_popup', 'CitaPage%d', "
 389                         "'toolbar=no,location=no,copyhistory=no,status=no,"
 390                         "scrollbars=yes,resizable=no,height=250,width=400');\n",
 391                         ++pageseq);
 392                 wprintf("}\n");
 393                 wprintf("</SCRIPT>\n");
 394                 /* end script */
 395
 396                 /* (JavaScript keyboard-based navigation would go here) */
 397
 398                 if (!suppress_check) if (WC->HaveExpressMessages) {
 399                         svprintf("extrabodyparms", WCS_STRING, "%s",
 400                                 "onload=\"launch_page_popup()\" ");
 401                         WC->HaveExpressMessages = 0;
 402                 }
 403                 do_template("background");
 404                 clear_local_substs();
 405
 406         if (print_standard_html_head == 1) {
 407                 wprintf("<A NAME=\"TheTop\"></A>");
 408
 409                 wprintf("<TABLE border=0 width=100%%><TR VALIGN=TOP>"
 410                         "<TD>\n");
 411
 412                 embed_room_banner(NULL);
 413
 414                 wprintf("</TD></TR><TR VALIGN=TOP><TD>\n");
 415
 416                 WC->fake_frames = 1;
 417                 }
 418         }
 419 }
 420
 421
 422 /*
 423  *
 424  */
 425 void http_redirect(char *whichpage) {
 426         wprintf("HTTP/1.0 302 Moved Temporarily\n");
 427         wprintf("Location: %s\n", whichpage);
 428         wprintf("URI: %s\n", whichpage);
 429         wprintf("Content-type: text/html\n\n");
 430         wprintf("<html><body>\n");
 431         wprintf("you really want to be <A HREF=\"%s\">here</A> now\n",
 432                 whichpage);
 433         wprintf("</body></html>\n");
 434 }
 435
 436
 437
 438 void check_for_express_messages()
 439 {
 440         char buf[SIZ];
 441
 442         serv_puts("NOOP");
 443         serv_gets(buf);
 444         if (buf[3] == '*') WC->HaveExpressMessages = 1;
 445 }
 446
 447
 448
 449
 450 /*
 451  * Output a piece of content to the web browser, compressing if necessary
 452  */
 453 void http_transmit_thing(char *thing, size_t length, char *content_type) {
 454
 455         int do_compress = 0;
 456         char *compressed_xferbuf = NULL;
 457
 458 #ifdef WITH_ZLIB
 459         uLongf compressed_size = 0;
 460 #endif
 461
 462 #ifdef WITH_ZLIB
 463         do_compress = WC->gzcompressed;
 464 #endif
 465
 466 #ifdef WITH_ZLIB
 467         if (do_compress) {
 468                 /* Write it to the browser -- compressed */
 469                 compressed_size = (uLongf)
 470                                 ((length * 101) / 100) + 4096;
 471                 compressed_xferbuf = malloc(compressed_size);
 472                 lprintf(9, "uncompressed size: %d\n", length);
 473                 compress2(compressed_xferbuf, &compressed_size,
 474                         thing, (uLong)length, 9);
 475                 lprintf(9, "  compressed size: %d\n", compressed_size);
 476
 477                 if (compressed_size < length) {
 478                         output_headers(0);
 479                         wprintf("Content-type: %s\n"
 480                                 "Content-length: %ld\n"
 481                                 "Content-Encoding: gzip\n"
 482                                 "\n",
 483                                 content_type,
 484                                 (long) compressed_size
 485                         );
 486                         http_write(WC->http_sock, compressed_xferbuf,
 487                                                         compressed_size);
 488                 }
 489                 else {
 490                         do_compress = 0;
 491                 }
 492         }
 493 #endif
 494
 495         if (!do_compress) {
 496                 /* Write it to the browser -- no compression */
 497                 output_headers(0);
 498                 wprintf("Content-type: %s\n"
 499                         "Content-length: %ld\n"
 500                         "\n",
 501                 content_type,
 502                 (long) length
 503                 );
 504                 http_write(WC->http_sock, thing, length);
 505         }
 506
 507         if (compressed_xferbuf) {
 508                 free(compressed_xferbuf);
 509         }
 510 }
 511
 512
 513
 514
 515
 516
 517
 518
 519 void output_static(char *what)
 520 {
 521         char buf[4096];
 522         FILE *fp;
 523         struct stat statbuf;
 524         off_t bytes;
 525         char *bigbuffer;
 526         char content_type[SIZ];
 527
 528         sprintf(buf, "static/%s", what);
 529         fp = fopen(buf, "rb");
 530         if (fp == NULL) {
 531                 wprintf("HTTP/1.0 404 %s\n", strerror(errno));
 532                 wprintf("Content-Type: text/plain\n");
 533                 wprintf("\n");
 534                 wprintf("Cannot open %s: %s\n", what, strerror(errno));
 535         } else {
 536                 if (!strncasecmp(&what[strlen(what) - 4], ".gif", 4))
 537                         strcpy(content_type, "image/gif");
 538                 else if (!strncasecmp(&what[strlen(what) - 4], ".txt", 4))
 539                         strcpy(content_type, "text/plain");
 540                 else if (!strncasecmp(&what[strlen(what) - 4], ".css", 4))
 541                         strcpy(content_type, "text/css");
 542                 else if (!strncasecmp(&what[strlen(what) - 4], ".jpg", 4))
 543                         strcpy(content_type, "image/jpeg");
 544                 else if (!strncasecmp(&what[strlen(what) - 4], ".png", 4))
 545                         strcpy(content_type, "image/png");
 546                 else if (!strncasecmp(&what[strlen(what) - 5], ".html", 5))
 547                         strcpy(content_type, "text/html");
 548                 else if (!strncasecmp(&what[strlen(what) - 4], ".wml", 4))
 549                         strcpy(content_type, "text/vnd.wap.wml");
 550                 else if (!strncasecmp(&what[strlen(what) - 5], ".wmls", 5))
 551                         strcpy(content_type, "text/vnd.wap.wmlscript");
 552                 else if (!strncasecmp(&what[strlen(what) - 5], ".wmlc", 5))
 553                         strcpy(content_type, "application/vnd.wap.wmlc");
 554                 else if (!strncasecmp(&what[strlen(what) - 6], ".wmlsc", 6))
 555                         strcpy(content_type, "application/vnd.wap.wmlscriptc");
 556                 else if (!strncasecmp(&what[strlen(what) - 5], ".wbmp", 5))
 557                         wprintf("Content-type: image/vnd.wap.wbmp");
 558                 else
 559                         wprintf("Content-type: application/octet-stream");
 560
 561                 fstat(fileno(fp), &statbuf);
 562                 bytes = statbuf.st_size;
 563                 lprintf(3, "Static: %s, %ld bytes\n", what, bytes);
 564                 bigbuffer = malloc(bytes);
 565                 fread(bigbuffer, bytes, 1, fp);
 566                 fclose(fp);
 567
 568                 http_transmit_thing(bigbuffer, (size_t)bytes, content_type);
 569                 free(bigbuffer);
 570         }
 571         if (!strcasecmp(bstr("force_close_session"), "yes")) {
 572                 end_webcit_session();
 573         }
 574 }
 575
 576
 577 /*
 578  * When the browser requests an image file from the Citadel server,
 579  * this function is called to transmit it.
 580  */
 581 void output_image()
 582 {
 583         char buf[SIZ];
 584         char *xferbuf = NULL;
 585         off_t bytes;
 586         off_t thisblock;
 587         off_t accomplished = 0L;
 588
 589         lprintf(5, "output_image() called\n");
 590         serv_printf("OIMG %s|%s", bstr("name"), bstr("parm"));
 591         serv_gets(buf);
 592         if (buf[0] == '2') {
 593                 bytes = extract_long(&buf[4], 0);
 594                 xferbuf = malloc(bytes);
 595
 596                 /* Read it from the server */
 597                 while (bytes > (off_t) 0) {
 598                         thisblock = (off_t) sizeof(xferbuf);
 599                         if (thisblock > bytes) {
 600                                 thisblock = bytes;
 601                         }
 602                         serv_printf("READ %ld|%ld", accomplished, thisblock);
 603                         serv_gets(buf);
 604                         if (buf[0] == '6') {
 605                                 thisblock = extract_long(&buf[4], 0);
 606                                 serv_read(&xferbuf[accomplished],
 607                                         (int) thisblock);
 608                         }
 609                         else {
 610                                 memset(&xferbuf[accomplished], 0, thisblock);
 611                         }
 612                         bytes = bytes - thisblock;
 613                         accomplished += thisblock;
 614                 }
 615                 serv_puts("CLOS");
 616                 serv_gets(buf);
 617
 618                 /* Write it to the browser */
 619                 http_transmit_thing(xferbuf, (size_t)accomplished,
 620                                         "image/gif");
 621
 622         } else {
 623                 wprintf("HTTP/1.0 404 %s\n", &buf[4]);
 624                 output_headers(0);
 625                 wprintf("Content-Type: text/plain\n"
 626                         "\n"
 627                         "Error retrieving image: %s\n",
 628                         &buf[4]
 629                 );
 630         }
 631
 632         if (xferbuf) {
 633                 free(xferbuf);
 634         }
 635
 636 }
 637
 638 /*
 639  */
 640 void output_mimepart()
 641 {
 642         char buf[SIZ];
 643         char xferbuf[4096];
 644         off_t bytes;
 645         off_t thisblock;
 646         off_t accomplished = 0L;
 647         char content_type[SIZ];
 648
 649         serv_printf("OPNA %s|%s", bstr("msgnum"), bstr("partnum"));
 650         serv_gets(buf);
 651         if (buf[0] == '2') {
 652                 bytes = extract_long(&buf[4], 0);
 653                 extract(content_type, &buf[4], 3);
 654                 output_headers(0);
 655                 wprintf("Content-type: %s\n", content_type);
 656                 wprintf("Content-length: %ld\n", (long) bytes);
 657                 wprintf("\n");
 658
 659                 while (bytes > (off_t) 0) {
 660                         thisblock = (off_t) sizeof(xferbuf);
 661                         if (thisblock > bytes) {
 662                                 thisblock = bytes;
 663                         }
 664                         serv_printf("READ %ld|%ld", accomplished, thisblock);
 665                         serv_gets(buf);
 666                         if (buf[0] == '6') {
 667                                 thisblock = extract_long(&buf[4], 0);
 668                                 serv_read(xferbuf, (int) thisblock);
 669                         }
 670                         else {
 671                                 memset(xferbuf, 0, thisblock);
 672                         }
 673                         http_write(WC->http_sock, xferbuf, thisblock);
 674                         bytes = bytes - thisblock;
 675                         accomplished = accomplished + thisblock;
 676                 }
 677                 serv_puts("CLOS");
 678                 serv_gets(buf);
 679         } else {
 680                 wprintf("HTTP/1.0 404 %s\n", &buf[4]);
 681                 output_headers(0);
 682                 wprintf("Content-Type: text/plain\n");
 683                 wprintf("\n");
 684                 wprintf("Error retrieving part: %s\n", &buf[4]);
 685         }
 686
 687 }
 688
 689
 690 /*
 691  */
 692 char *load_mimepart(long msgnum, char *partnum)
 693 {
 694         char buf[SIZ];
 695         off_t bytes;
 696         off_t thisblock;
 697         off_t accomplished = 0L;
 698         char content_type[SIZ];
 699         char *content;
 700
 701         serv_printf("OPNA %ld|%s", msgnum, partnum);
 702         serv_gets(buf);
 703         if (buf[0] == '2') {
 704                 bytes = extract_long(&buf[4], 0);
 705                 extract(content_type, &buf[4], 3);
 706
 707                 content = malloc(bytes + 1);
 708
 709                 while (bytes > (off_t) 0) {
 710                         thisblock = bytes;
 711                         if (thisblock > 4096L) {
 712                                 thisblock = 4096L;
 713                         }
 714                         if (thisblock > bytes) {
 715                                 thisblock = bytes;
 716                         }
 717                         serv_printf("READ %ld|%ld", accomplished, thisblock);
 718                         serv_gets(buf);
 719                         if (buf[0] == '6') {
 720                                 thisblock = extract_long(&buf[4], 0);
 721                                 serv_read(&content[accomplished], (int) thisblock);
 722                         }
 723                         else {
 724                                 memset(&content[accomplished], 0, thisblock);
 725                         }
 726                         bytes = bytes - thisblock;
 727                         accomplished = accomplished + thisblock;
 728                 }
 729                 serv_puts("CLOS");
 730                 serv_gets(buf);
 731                 content[accomplished] = 0;      /* null terminate for good measure */
 732                 return(content);
 733         }
 734         else {
 735                 return(NULL);
 736         }
 737
 738 }
 739
 740
 741 /*
 742  * Convenience functions to display a page containing only a string
 743  */
 744 void convenience_page(char *titlebarcolor, char *titlebarmsg, char *messagetext)
 745 {
 746         wprintf("HTTP/1.0 200 OK\n");
 747         output_headers(1);
 748         wprintf("<TABLE WIDTH=100%% BORDER=0 BGCOLOR=%s><TR><TD>", titlebarcolor);
 749         wprintf("<FONT SIZE=+1 COLOR=\"FFFFFF\"");
 750         wprintf("<B>%s</B>\n", titlebarmsg);
 751         wprintf("</FONT></TD></TR></TABLE><BR>\n");
 752         escputs(messagetext);
 753
 754         wprintf("<HR>\n");
 755         wDumpContent(1);
 756 }
 757
 758
 759 /*
 760  * Display a blank page.
 761  */
 762 void blank_page(void) {
 763         output_headers(7);
 764         wDumpContent(2);
 765 }
 766
 767
 768
 769
 770 /*
 771  * Offer to make any page the user's "start page."
 772  */
 773 void offer_start_page(void) {
 774         wprintf("<A HREF=\"/change_start_page?startpage=");
 775         urlescputs(WC->this_page);
 776         wprintf("\">"
 777                 "<FONT SIZE=-2 COLOR=#AAAAAA>Make this my start page</FONT>"
 778                 "</A>"
 779         );
 780 }
 781
 782
 783 /*
 784  * Change the user's start page
 785  */
 786 void change_start_page(void) {
 787
 788         if (bstr("startpage") == NULL) {
 789                 display_error("startpage set to null");
 790                 return;
 791         }
 792
 793         set_preference("startpage", bstr("startpage"));
 794
 795         output_headers(3);
 796         wprintf("<TABLE WIDTH=100%% BORDER=0 BGCOLOR=000077><TR><TD>");
 797         wprintf("<FONT SIZE=+1 COLOR=\"FFFFFF\"");
 798         wprintf("<B>New start page</B>\n");
 799         wprintf("</FONT></TD></TR></TABLE>\n");
 800
 801         wprintf("<CENTER>"
 802                 "<font size=+2>Your start page has been changed.</font>"
 803                 "<BR><BR>\n"
 804                 "<I>(Note: this does not change your browser's home page. "
 805                 "It changes the page you begin on when you log on to ");
 806         escputs(serv_info.serv_humannode);
 807         wprintf(".)</I><BR><BR>"
 808                 "<a href = \"javascript:history.back()\">Back...</a>"
 809                 "</CENTER>");
 810
 811         wDumpContent(1);
 812 }
 813
 814
 815
 816
 817 void display_error(char *errormessage)
 818 {
 819         convenience_page("770000", "Error", errormessage);
 820 }
 821
 822 void display_success(char *successmessage)
 823 {
 824         convenience_page("007700", "OK", successmessage);
 825 }
 826
 827
 828
 829 void extract_action(char *actbuf, char *cmdbuf)
 830 {
 831         int i;
 832
 833         strcpy(actbuf, cmdbuf);
 834         if (!strncasecmp(actbuf, "GET /", 5))
 835                 strcpy(actbuf, &actbuf[5]);
 836         if (!strncasecmp(actbuf, "PUT /", 5))
 837                 strcpy(actbuf, &actbuf[5]);
 838         if (!strncasecmp(actbuf, "POST /", 6))
 839                 strcpy(actbuf, &actbuf[6]);
 840
 841         for (i = 0; i < strlen(actbuf); ++i) {
 842                 if (actbuf[i] == ' ') {
 843                         actbuf[i] = 0;
 844                         i = 0;
 845                 }
 846                 if (actbuf[i] == '/') {
 847                         actbuf[i] = 0;
 848                         i = 0;
 849                 }
 850                 if (actbuf[i] == '?') {
 851                         actbuf[i] = 0;
 852                         i = 0;
 853                 }
 854                 if (actbuf[i] == '&') {
 855                         actbuf[i] = 0;
 856                         i = 0;
 857                 }
 858         }
 859 }
 860
 861
 862 void upload_handler(char *name, char *filename, char *partnum, char *disp,
 863                         void *content, char *cbtype, size_t length,
 864                         char *encoding, void *userdata)
 865 {
 866
 867         lprintf(5, "UPLOAD HANDLER CALLED\n");
 868         lprintf(5, "    name = %s\n", name);
 869         lprintf(5, "filename = %s\n", filename);
 870         lprintf(5, "encoding = %s\n", encoding);
 871         lprintf(5, "    type = %s\n", cbtype);
 872         lprintf(5, "  length = %ld\n", (long)length);
 873
 874         if (length > 0) {
 875                 WC->upload = malloc(length);
 876                 if (WC->upload != NULL) {
 877                         WC->upload_length = length;
 878                         memcpy(WC->upload, content, length);
 879                 }
 880                 else {
 881                         lprintf(9, "malloc() failed: %s\n",
 882                                 strerror(errno));
 883                 }
 884         }
 885 }
 886
 887
 888
 889
 890 /*
 891  * Entry point for WebCit transaction
 892  */
 893 void session_loop(struct httprequest *req, int gzip)
 894 {
 895         char cmd[SIZ];
 896         char action[SIZ];
 897         char buf[SIZ];
 898         int a, b;
 899         int ContentLength = 0;
 900         int BytesRead;
 901         char ContentType[512];
 902         char *content;
 903         char *content_end;
 904         struct httprequest *hptr;
 905         char browser_host[SIZ];
 906         char user_agent[SIZ];
 907
 908         /* We stuff these with the values coming from the client cookies,
 909          * so we can use them to reconnect a timed out session if we have to.
 910          */
 911         char c_host[SIZ];
 912         char c_port[SIZ];
 913         char c_username[SIZ];
 914         char c_password[SIZ];
 915         char c_roomname[SIZ];
 916         char cookie[SIZ];
 917
 918         strcpy(c_host, defaulthost);
 919         strcpy(c_port, defaultport);
 920         strcpy(c_username, "");
 921         strcpy(c_password, "");
 922         strcpy(c_roomname, "");
 923
 924         WC->upload_length = 0;
 925         WC->upload = NULL;
 926
 927         WC->is_wap = 0;
 928
 929         if (gzip) {
 930                 WC->gzcompressed = 1;
 931         }
 932         else {
 933                 WC->gzcompressed = 0;
 934         }
 935
 936         hptr = req;
 937         if (hptr == NULL) return;
 938
 939         strcpy(cmd, hptr->line);
 940         hptr = hptr->next;
 941         extract_action(action, cmd);
 942
 943         while (hptr != NULL) {
 944                 strcpy(buf, hptr->line);
 945                 hptr = hptr->next;
 946
 947                 if (!strncasecmp(buf, "Cookie: webcit=", 15)) {
 948                         strcpy(cookie, &buf[15]);
 949                         cookie_to_stuff(cookie, NULL,
 950                                       c_username, c_password, c_roomname);
 951                 }
 952                 else if (!strncasecmp(buf, "Content-length: ", 16)) {
 953                         ContentLength = atoi(&buf[16]);
 954                 }
 955                 else if (!strncasecmp(buf, "Content-type: ", 14)) {
 956                         safestrncpy(ContentType, &buf[14], sizeof ContentType);
 957                 }
 958                 else if (!strncasecmp(buf, "User-agent: ", 12)) {
 959                         safestrncpy(user_agent, &buf[12], sizeof user_agent);
 960                 }
 961                 else if (!strncasecmp(buf, "Host: ", 6)) {
 962                         safestrncpy(WC->http_host, &buf[6], sizeof WC->http_host);
 963                 }
 964                 /* Only WAP gateways explicitly name this content-type */
 965                 else if (strstr(buf, "text/vnd.wap.wml")) {
 966                         WC->is_wap = 1;
 967                 }
 968         }
 969
 970         if (ContentLength > 0) {
 971                 lprintf(5, "Content length: %d\n", ContentLength);
 972                 content = malloc(ContentLength + 1);
 973                 memset(content, 0, ContentLength+1);
 974                 BytesRead = 0;
 975
 976                 while (BytesRead < ContentLength) {
 977                         a=read(WC->http_sock, &content[BytesRead],
 978                                 ContentLength - BytesRead);
 979                         if (a <= 0) BytesRead = ContentLength;
 980                         else BytesRead += a;
 981                 }
 982
 983                 if (!strncasecmp(ContentType,
 984                               "application/x-www-form-urlencoded", 33)) {
 985                         addurls(content);
 986                 } else if (!strncasecmp(ContentType, "multipart", 9)) {
 987                         content_end = content + ContentLength;
 988                         mime_parser(content, content_end, *upload_handler,
 989                                         NULL, NULL, NULL, 0);
 990                 }
 991         } else {
 992                 content = NULL;
 993         }
 994
 995         /* make a note of where we are in case the user wants to save it */
 996         safestrncpy(WC->this_page, cmd, sizeof(WC->this_page));
 997         remove_token(WC->this_page, 2, ' ');
 998         remove_token(WC->this_page, 0, ' ');
 999
1000         /* If there are variables in the URL, we must grab them now */
1001         for (a = 0; a < strlen(cmd); ++a) {
1002                 if ((cmd[a] == '?') || (cmd[a] == '&')) {
1003                         for (b = a; b < strlen(cmd); ++b)
1004                                 if (isspace(cmd[b]))
1005                                         cmd[b] = 0;
1006                         addurls(&cmd[a + 1]);
1007                         cmd[a] = 0;
1008                 }
1009         }
1010
1011         /*
1012          * If we're not connected to a Citadel server, try to hook up the
1013          * connection now.  Preference is given to the host and port specified
1014          * by browser cookies, if cookies have been supplied.
1015          */
1016         if (!WC->connected) {
1017                 if (strlen(bstr("host")) > 0)
1018                         strcpy(c_host, bstr("host"));
1019                 if (strlen(bstr("port")) > 0)
1020                         strcpy(c_port, bstr("port"));
1021
1022                 if (!strcasecmp(c_host, "uds")) {
1023                         /* unix domain socket */
1024                         sprintf(buf, "%s/citadel.socket", c_port);
1025                         WC->serv_sock = uds_connectsock(buf);
1026                 }
1027                 else {
1028                         /* tcp socket */
1029                         WC->serv_sock = tcp_connectsock(c_host, c_port);
1030                 }
1031
1032                 if (WC->serv_sock < 0) {
1033                         do_logout();
1034                         goto SKIP_ALL_THIS_CRAP;
1035                 }
1036                 else {
1037                         WC->connected = 1;
1038                         serv_gets(buf); /* get the server welcome message */
1039                         locate_host(browser_host, WC->http_sock);
1040                         get_serv_info(browser_host, user_agent);
1041                 }
1042         }
1043
1044         /*
1045          * Functions which can be performed without logging in
1046          */
1047         if (!strcasecmp(action, "listsub")) {
1048                 do_listsub();
1049                 goto SKIP_ALL_THIS_CRAP;
1050         }
1051
1052         check_for_express_messages();
1053
1054         /*
1055          * If we're not logged in, but we have username and password cookies
1056          * supplied by the browser, try using them to log in.
1057          */
1058         if ((!WC->logged_in) && (strlen(c_username) > 0) && (strlen(c_password) > 0)) {
1059                 serv_printf("USER %s", c_username);
1060                 serv_gets(buf);
1061                 if (buf[0] == '3') {
1062                         serv_printf("PASS %s", c_password);
1063                         serv_gets(buf);
1064                         if (buf[0] == '2') {
1065                                 become_logged_in(c_username, c_password, buf);
1066                         }
1067                 }
1068         }
1069         /*
1070          * If we don't have a current room, but a cookie specifying the
1071          * current room is supplied, make an effort to go there.
1072          */
1073         if ((strlen(WC->wc_roomname) == 0) && (strlen(c_roomname) > 0)) {
1074                 serv_printf("GOTO %s", c_roomname);
1075                 serv_gets(buf);
1076                 if (buf[0] == '2') {
1077                         strcpy(WC->wc_roomname, c_roomname);
1078                 }
1079         }
1080         if (!strcasecmp(action, "static")) {
1081                 strcpy(buf, &cmd[12]);
1082                 for (a = 0; a < strlen(buf); ++a)
1083                         if (isspace(buf[a]))
1084                                 buf[a] = 0;
1085                 output_static(buf);
1086         } else if (!strcasecmp(action, "image")) {
1087                 output_image();
1088
1089         /*
1090          * All functions handled below this point ... make sure we log in
1091          * before doing anything else!
1092          */
1093         } else if ((!WC->logged_in) && (!strcasecmp(action, "login"))) {
1094                 do_login();
1095         } else if (!WC->logged_in) {
1096                 display_login(NULL);
1097         }
1098
1099         /*
1100          * Various commands...
1101          */
1102
1103         else if (!strcasecmp(action, "do_welcome")) {
1104                 do_welcome();
1105         } else if (!strcasecmp(action, "blank")) {
1106                 blank_page();
1107         } else if (!strcasecmp(action, "display_main_menu")) {
1108                 display_main_menu();
1109         } else if (!strcasecmp(action, "whobbs")) {
1110                 whobbs();
1111         } else if (!strcasecmp(action, "knrooms")) {
1112                 knrooms();
1113         } else if (!strcasecmp(action, "gotonext")) {
1114                 slrp_highest();
1115                 gotonext();
1116         } else if (!strcasecmp(action, "skip")) {
1117                 gotonext();
1118         } else if (!strcasecmp(action, "ungoto")) {
1119                 ungoto();
1120         } else if (!strcasecmp(action, "dotgoto")) {
1121                 slrp_highest();
1122                 smart_goto(bstr("room"));
1123         } else if (!strcasecmp(action, "dotskip")) {
1124                 smart_goto(bstr("room"));
1125         } else if (!strcasecmp(action, "termquit")) {
1126                 do_logout();
1127         } else if (!strcasecmp(action, "readnew")) {
1128                 readloop("readnew");
1129         } else if (!strcasecmp(action, "readold")) {
1130                 readloop("readold");
1131         } else if (!strcasecmp(action, "readfwd")) {
1132                 readloop("readfwd");
1133         } else if (!strcasecmp(action, "headers")) {
1134                 readloop("headers");
1135         } else if (!strcasecmp(action, "display_enter")) {
1136                 display_enter();
1137         } else if (!strcasecmp(action, "post")) {
1138                 post_message();
1139         } else if (!strcasecmp(action, "delete_msg")) {
1140                 delete_msg();
1141         } else if (!strcasecmp(action, "confirm_move_msg")) {
1142                 confirm_move_msg();
1143         } else if (!strcasecmp(action, "move_msg")) {
1144                 move_msg();
1145         } else if (!strcasecmp(action, "userlist")) {
1146                 userlist();
1147         } else if (!strcasecmp(action, "showuser")) {
1148                 showuser();
1149         } else if (!strcasecmp(action, "display_page")) {
1150                 display_page();
1151         } else if (!strcasecmp(action, "page_user")) {
1152                 page_user();
1153         } else if (!strcasecmp(action, "chat")) {
1154                 do_chat();
1155         } else if (!strcasecmp(action, "display_private")) {
1156                 display_private("", 0);
1157         } else if (!strcasecmp(action, "goto_private")) {
1158                 goto_private();
1159         } else if (!strcasecmp(action, "zapped_list")) {
1160                 zapped_list();
1161         } else if (!strcasecmp(action, "display_zap")) {
1162                 display_zap();
1163         } else if (!strcasecmp(action, "zap")) {
1164                 zap();
1165         } else if (!strcasecmp(action, "display_entroom")) {
1166                 display_entroom();
1167         } else if (!strcasecmp(action, "entroom")) {
1168                 entroom();
1169         } else if (!strcasecmp(action, "display_editroom")) {
1170                 display_editroom();
1171         } else if (!strcasecmp(action, "netedit")) {
1172                 netedit();
1173         } else if (!strcasecmp(action, "editroom")) {
1174                 editroom();
1175         } else if (!strcasecmp(action, "display_whok")) {
1176                 display_whok();
1177         } else if (!strcasecmp(action, "display_editinfo")) {
1178                 display_edit("Room info", "EINF 0", "RINF", "/editinfo");
1179         } else if (!strcasecmp(action, "editinfo")) {
1180                 save_edit("Room info", "EINF 1", 1);
1181         } else if (!strcasecmp(action, "display_editbio")) {
1182                 sprintf(buf, "RBIO %s", WC->wc_username);
1183                 display_edit("Your bio", "NOOP", buf, "editbio");
1184         } else if (!strcasecmp(action, "editbio")) {
1185                 save_edit("Your bio", "EBIO", 0);
1186         } else if (!strcasecmp(action, "confirm_delete_room")) {
1187                 confirm_delete_room();
1188         } else if (!strcasecmp(action, "delete_room")) {
1189                 delete_room();
1190         } else if (!strcasecmp(action, "validate")) {
1191                 validate();
1192         } else if (!strcasecmp(action, "display_editpic")) {
1193                 display_graphics_upload("your photo",
1194                                         "UIMG 0|_userpic_",
1195                                         "/editpic");
1196         } else if (!strcasecmp(action, "editpic")) {
1197                 do_graphics_upload("UIMG 1|_userpic_");
1198         } else if (!strcasecmp(action, "display_editroompic")) {
1199                 display_graphics_upload("the graphic for this room",
1200                                         "UIMG 0|_roompic_",
1201                                         "/editroompic");
1202         } else if (!strcasecmp(action, "editroompic")) {
1203                 do_graphics_upload("UIMG 1|_roompic_");
1204         } else if (!strcasecmp(action, "delete_floor")) {
1205                 delete_floor();
1206         } else if (!strcasecmp(action, "rename_floor")) {
1207                 rename_floor();
1208         } else if (!strcasecmp(action, "create_floor")) {
1209                 create_floor();
1210         } else if (!strcasecmp(action, "display_editfloorpic")) {
1211                 sprintf(buf, "UIMG 0|_floorpic_|%s",
1212                         bstr("which_floor"));
1213                 display_graphics_upload("the graphic for this floor",
1214                                         buf,
1215                                         "/editfloorpic");
1216         } else if (!strcasecmp(action, "editfloorpic")) {
1217                 sprintf(buf, "UIMG 1|_floorpic_|%s",
1218                         bstr("which_floor"));
1219                 do_graphics_upload(buf);
1220         } else if (!strcasecmp(action, "display_reg")) {
1221                 display_reg(0);
1222         } else if (!strcasecmp(action, "register")) {
1223                 register_user();
1224         } else if (!strcasecmp(action, "display_changepw")) {
1225                 display_changepw();
1226         } else if (!strcasecmp(action, "changepw")) {
1227                 changepw();
1228         } else if (!strcasecmp(action, "display_edit_node")) {
1229                 display_edit_node();
1230         } else if (!strcasecmp(action, "edit_node")) {
1231                 edit_node();
1232         } else if (!strcasecmp(action, "display_netconf")) {
1233                 display_netconf();
1234         } else if (!strcasecmp(action, "display_confirm_delete_node")) {
1235                 display_confirm_delete_node();
1236         } else if (!strcasecmp(action, "delete_node")) {
1237                 delete_node();
1238         } else if (!strcasecmp(action, "display_add_node")) {
1239                 display_add_node();
1240         } else if (!strcasecmp(action, "add_node")) {
1241                 add_node();
1242         } else if (!strcasecmp(action, "terminate_session")) {
1243                 slrp_highest();
1244                 terminate_session();
1245         } else if (!strcasecmp(action, "edit_me")) {
1246                 edit_me();
1247         } else if (!strcasecmp(action, "display_siteconfig")) {
1248                 display_siteconfig();
1249         } else if (!strcasecmp(action, "page_popup")) {
1250                 page_popup();
1251         } else if (!strcasecmp(action, "siteconfig")) {
1252                 siteconfig();
1253         } else if (!strcasecmp(action, "display_generic")) {
1254                 display_generic();
1255         } else if (!strcasecmp(action, "do_generic")) {
1256                 do_generic();
1257         } else if (!strcasecmp(action, "display_menubar")) {
1258                 display_menubar(1);
1259         } else if (!strcasecmp(action, "output_mimepart")) {
1260                 output_mimepart();
1261         } else if (!strcasecmp(action, "edit_vcard")) {
1262                 edit_vcard();
1263         } else if (!strcasecmp(action, "submit_vcard")) {
1264                 submit_vcard();
1265         } else if (!strcasecmp(action, "select_user_to_edit")) {
1266                 select_user_to_edit(NULL, NULL);
1267         } else if (!strcasecmp(action, "display_edituser")) {
1268                 display_edituser(NULL);
1269         } else if (!strcasecmp(action, "edituser")) {
1270                 edituser();
1271         } else if (!strcasecmp(action, "create_user")) {
1272                 create_user();
1273         } else if (!strcasecmp(action, "changeview")) {
1274                 change_view();
1275         } else if (!strcasecmp(action, "folders")) {
1276                 folders();
1277         } else if (!strcasecmp(action, "do_stuff_to_msgs")) {
1278                 do_stuff_to_msgs();
1279         } else if (!strcasecmp(action, "change_start_page")) {
1280                 change_start_page();
1281         } else if (!strcasecmp(action, "display_floorconfig")) {
1282                 display_floorconfig(NULL);
1283         } else if (!strcasecmp(action, "toggle_self_service")) {
1284                 toggle_self_service();
1285         } else if (!strcasecmp(action, "summary")) {
1286                 summary();
1287         } else if (!strcasecmp(action, "diagnostics")) {
1288                 output_headers(1);
1289
1290                 wprintf("You're in session %d<HR>\n", WC->wc_session);
1291                 wprintf("Command: <BR><PRE>\n");
1292                 escputs(cmd);
1293                 wprintf("</PRE><HR>\n");
1294                 wprintf("Variables: <BR><PRE>\n");
1295                 dump_vars();
1296                 wprintf("</PRE><HR>\n");
1297                 wDumpContent(1);
1298         }
1299         /* When all else fais, display the main menu. */
1300         else {
1301                 display_main_menu();
1302         }
1303
1304 SKIP_ALL_THIS_CRAP:
1305         fflush(stdout);
1306         if (content != NULL) {
1307                 free(content);
1308                 content = NULL;
1309         }
1310         free_urls();
1311         if (WC->upload_length > 0) {
1312                 free(WC->upload);
1313                 WC->upload_length = 0;
1314         }
1315
1316 #ifdef WITH_ZLIB
1317         if (WC->gzfd) {
1318                 gzclose(WC->gzfd);
1319                 WC->gzfd = NULL;
1320                 WC->gzcompressed = 0;
1321         }
1322 #endif
1323 }