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 void output_static(char *what)
 451 {
 452         char buf[4096];
 453         FILE *fp;
 454         struct stat statbuf;
 455         off_t bytes;
 456         char *bigbuffer;
 457
 458         sprintf(buf, "static/%s", what);
 459         fp = fopen(buf, "rb");
 460         if (fp == NULL) {
 461                 wprintf("HTTP/1.0 404 %s\n", strerror(errno));
 462                 wprintf("Content-Type: text/plain\n");
 463                 wprintf("\n");
 464                 wprintf("Cannot open %s: %s\n", what, strerror(errno));
 465         } else {
 466                 output_headers(0);
 467
 468                 if (!strncasecmp(&what[strlen(what) - 4], ".gif", 4))
 469                         wprintf("Content-type: image/gif\n");
 470                 else if (!strncasecmp(&what[strlen(what) - 4], ".txt", 4))
 471                         wprintf("Content-type: text/plain\n");
 472                 else if (!strncasecmp(&what[strlen(what) - 4], ".css", 4))
 473                         wprintf("Content-type: text/css\n");
 474                 else if (!strncasecmp(&what[strlen(what) - 4], ".jpg", 4))
 475                         wprintf("Content-type: image/jpeg\n");
 476                 else if (!strncasecmp(&what[strlen(what) - 4], ".png", 4))
 477                         wprintf("Content-type: image/png\n");
 478                 else if (!strncasecmp(&what[strlen(what) - 5], ".html", 5))
 479                         wprintf("Content-type: text/html\n");
 480                 else if (!strncasecmp(&what[strlen(what) - 4], ".wml", 4))
 481                         wprintf("Content-type: text/vnd.wap.wml\n");
 482                 else if (!strncasecmp(&what[strlen(what) - 5], ".wmls", 5))
 483                         wprintf("Content-type: text/vnd.wap.wmlscript\n");
 484                 else if (!strncasecmp(&what[strlen(what) - 5], ".wmlc", 5))
 485                         wprintf("Content-type: application/vnd.wap.wmlc\n");
 486                 else if (!strncasecmp(&what[strlen(what) - 6], ".wmlsc", 6))
 487                         wprintf("Content-type: application/vnd.wap.wmlscriptc\n");
 488                 else if (!strncasecmp(&what[strlen(what) - 5], ".wbmp", 5))
 489                         wprintf("Content-type: image/vnd.wap.wbmp\n");
 490                 else
 491                         wprintf("Content-type: application/octet-stream\n");
 492
 493                 fstat(fileno(fp), &statbuf);
 494                 bytes = statbuf.st_size;
 495                 lprintf(3, "Static: %s, %ld bytes\n", what, bytes);
 496                 wprintf("Content-length: %ld\n", (long) bytes);
 497                 wprintf("\n");
 498                 bigbuffer = malloc(bytes);
 499                 fread(bigbuffer, bytes, 1, fp);
 500                 fclose(fp);
 501                 http_write(WC->http_sock, bigbuffer, bytes);
 502                 free(bigbuffer);
 503         }
 504         if (!strcasecmp(bstr("force_close_session"), "yes")) {
 505                 end_webcit_session();
 506         }
 507 }
 508
 509
 510 /*
 511  * When the browser requests an image file from the Citadel server,
 512  * this function is called to transmit it.
 513  */
 514 void output_image()
 515 {
 516         char buf[SIZ];
 517         char *xferbuf = NULL;
 518         char *compressed_xferbuf = NULL;
 519         off_t bytes;
 520         off_t thisblock;
 521         off_t accomplished = 0L;
 522 #ifdef WITH_ZLIB
 523         uLongf compressed_size = 0;
 524 #endif
 525         int do_compress = 0;
 526
 527 #ifdef WITH_ZLIB
 528         do_compress = WC->gzcompressed;
 529 #endif
 530
 531         lprintf(5, "output_image() called; do_compress=%d\n", do_compress);
 532         serv_printf("OIMG %s|%s", bstr("name"), bstr("parm"));
 533         serv_gets(buf);
 534         if (buf[0] == '2') {
 535                 bytes = extract_long(&buf[4], 0);
 536                 xferbuf = malloc(bytes);
 537
 538                 /* Read it from the server */
 539                 while (bytes > (off_t) 0) {
 540                         thisblock = (off_t) sizeof(xferbuf);
 541                         if (thisblock > bytes) {
 542                                 thisblock = bytes;
 543                         }
 544                         serv_printf("READ %ld|%ld", accomplished, thisblock);
 545                         serv_gets(buf);
 546                         if (buf[0] == '6') {
 547                                 thisblock = extract_long(&buf[4], 0);
 548                                 serv_read(&xferbuf[accomplished],
 549                                         (int) thisblock);
 550                         }
 551                         else {
 552                                 memset(&xferbuf[accomplished], 0, thisblock);
 553                         }
 554                         bytes = bytes - thisblock;
 555                         accomplished += thisblock;
 556                 }
 557                 serv_puts("CLOS");
 558                 serv_gets(buf);
 559
 560 #ifdef WITH_ZLIB
 561                 if (do_compress) {
 562                         /* Write it to the browser -- compressed */
 563                         compressed_size = (uLongf)
 564                                         ((accomplished * 101) / 100) + 4096;
 565                         compressed_xferbuf = malloc(compressed_size);
 566                         lprintf(9, "uncompressed size: %d\n", accomplished);
 567                         compress2(compressed_xferbuf, &compressed_size,
 568                                 xferbuf, (uLong)accomplished, 9);
 569                         lprintf(9, "  compressed size: %d\n", compressed_size);
 570                         output_headers(0);
 571                         wprintf("Content-type: image/gif\n"
 572                                 "Content-length: %ld\n"
 573                                 "Content-Encoding: gzip\n"
 574                                 "\n",
 575                                 (long) compressed_size
 576                         );
 577                         http_write(WC->http_sock, compressed_xferbuf,
 578                                                         compressed_size);
 579                 }
 580 #endif
 581                 if (!do_compress) {
 582                         /* Write it to the browser -- no compression */
 583                         output_headers(0);
 584                         wprintf("Content-type: image/gif\n"
 585                         wprintf("Content-length: %ld\n"
 586                         wprintf("\n",
 587                         (long) accomplished
 588                         );
 589                         http_write(WC->http_sock, xferbuf, accomplished);
 590                 }
 591
 592         } else {
 593                 wprintf("HTTP/1.0 404 %s\n", &buf[4]);
 594                 output_headers(0);
 595                 wprintf("Content-Type: text/plain\n");
 596                 wprintf("\n");
 597                 wprintf("Error retrieving image: %s\n", &buf[4]);
 598         }
 599
 600         if (xferbuf) {
 601                 free(xferbuf);
 602         }
 603         if (compressed_xferbuf) {
 604                 free(compressed_xferbuf);
 605         }
 606
 607 }
 608
 609 /*
 610  */
 611 void output_mimepart()
 612 {
 613         char buf[SIZ];
 614         char xferbuf[4096];
 615         off_t bytes;
 616         off_t thisblock;
 617         off_t accomplished = 0L;
 618         char content_type[SIZ];
 619
 620         serv_printf("OPNA %s|%s", bstr("msgnum"), bstr("partnum"));
 621         serv_gets(buf);
 622         if (buf[0] == '2') {
 623                 bytes = extract_long(&buf[4], 0);
 624                 extract(content_type, &buf[4], 3);
 625                 output_headers(0);
 626                 wprintf("Content-type: %s\n", content_type);
 627                 wprintf("Content-length: %ld\n", (long) bytes);
 628                 wprintf("\n");
 629
 630                 while (bytes > (off_t) 0) {
 631                         thisblock = (off_t) sizeof(xferbuf);
 632                         if (thisblock > bytes) {
 633                                 thisblock = bytes;
 634                         }
 635                         serv_printf("READ %ld|%ld", accomplished, thisblock);
 636                         serv_gets(buf);
 637                         if (buf[0] == '6') {
 638                                 thisblock = extract_long(&buf[4], 0);
 639                                 serv_read(xferbuf, (int) thisblock);
 640                         }
 641                         else {
 642                                 memset(xferbuf, 0, thisblock);
 643                         }
 644                         http_write(WC->http_sock, xferbuf, thisblock);
 645                         bytes = bytes - thisblock;
 646                         accomplished = accomplished + thisblock;
 647                 }
 648                 serv_puts("CLOS");
 649                 serv_gets(buf);
 650         } else {
 651                 wprintf("HTTP/1.0 404 %s\n", &buf[4]);
 652                 output_headers(0);
 653                 wprintf("Content-Type: text/plain\n");
 654                 wprintf("\n");
 655                 wprintf("Error retrieving part: %s\n", &buf[4]);
 656         }
 657
 658 }
 659
 660
 661 /*
 662  */
 663 char *load_mimepart(long msgnum, char *partnum)
 664 {
 665         char buf[SIZ];
 666         off_t bytes;
 667         off_t thisblock;
 668         off_t accomplished = 0L;
 669         char content_type[SIZ];
 670         char *content;
 671
 672         serv_printf("OPNA %ld|%s", msgnum, partnum);
 673         serv_gets(buf);
 674         if (buf[0] == '2') {
 675                 bytes = extract_long(&buf[4], 0);
 676                 extract(content_type, &buf[4], 3);
 677
 678                 content = malloc(bytes + 1);
 679
 680                 while (bytes > (off_t) 0) {
 681                         thisblock = bytes;
 682                         if (thisblock > 4096L) {
 683                                 thisblock = 4096L;
 684                         }
 685                         if (thisblock > bytes) {
 686                                 thisblock = bytes;
 687                         }
 688                         serv_printf("READ %ld|%ld", accomplished, thisblock);
 689                         serv_gets(buf);
 690                         if (buf[0] == '6') {
 691                                 thisblock = extract_long(&buf[4], 0);
 692                                 serv_read(&content[accomplished], (int) thisblock);
 693                         }
 694                         else {
 695                                 memset(&content[accomplished], 0, thisblock);
 696                         }
 697                         bytes = bytes - thisblock;
 698                         accomplished = accomplished + thisblock;
 699                 }
 700                 serv_puts("CLOS");
 701                 serv_gets(buf);
 702                 content[accomplished] = 0;      /* null terminate for good measure */
 703                 return(content);
 704         }
 705         else {
 706                 return(NULL);
 707         }
 708
 709 }
 710
 711
 712 /*
 713  * Convenience functions to display a page containing only a string
 714  */
 715 void convenience_page(char *titlebarcolor, char *titlebarmsg, char *messagetext)
 716 {
 717         wprintf("HTTP/1.0 200 OK\n");
 718         output_headers(1);
 719         wprintf("<TABLE WIDTH=100%% BORDER=0 BGCOLOR=%s><TR><TD>", titlebarcolor);
 720         wprintf("<FONT SIZE=+1 COLOR=\"FFFFFF\"");
 721         wprintf("<B>%s</B>\n", titlebarmsg);
 722         wprintf("</FONT></TD></TR></TABLE><BR>\n");
 723         escputs(messagetext);
 724
 725         wprintf("<HR>\n");
 726         wDumpContent(1);
 727 }
 728
 729
 730 /*
 731  * Display a blank page.
 732  */
 733 void blank_page(void) {
 734         output_headers(7);
 735         wDumpContent(2);
 736 }
 737
 738
 739
 740
 741 /*
 742  * Offer to make any page the user's "start page."
 743  */
 744 void offer_start_page(void) {
 745         wprintf("<A HREF=\"/change_start_page?startpage=");
 746         urlescputs(WC->this_page);
 747         wprintf("\">"
 748                 "<FONT SIZE=-2 COLOR=#AAAAAA>Make this my start page</FONT>"
 749                 "</A>"
 750         );
 751 }
 752
 753
 754 /*
 755  * Change the user's start page
 756  */
 757 void change_start_page(void) {
 758
 759         if (bstr("startpage") == NULL) {
 760                 display_error("startpage set to null");
 761                 return;
 762         }
 763
 764         set_preference("startpage", bstr("startpage"));
 765
 766         output_headers(3);
 767         wprintf("<TABLE WIDTH=100%% BORDER=0 BGCOLOR=000077><TR><TD>");
 768         wprintf("<FONT SIZE=+1 COLOR=\"FFFFFF\"");
 769         wprintf("<B>New start page</B>\n");
 770         wprintf("</FONT></TD></TR></TABLE>\n");
 771
 772         wprintf("<CENTER>"
 773                 "<font size=+2>Your start page has been changed.</font>"
 774                 "<BR><BR>\n"
 775                 "<I>(Note: this does not change your browser's home page. "
 776                 "It changes the page you begin on when you log on to ");
 777         escputs(serv_info.serv_humannode);
 778         wprintf(".)</I><BR><BR>"
 779                 "<a href = \"javascript:history.back()\">Back...</a>"
 780                 "</CENTER>");
 781
 782         wDumpContent(1);
 783 }
 784
 785
 786
 787
 788 void display_error(char *errormessage)
 789 {
 790         convenience_page("770000", "Error", errormessage);
 791 }
 792
 793 void display_success(char *successmessage)
 794 {
 795         convenience_page("007700", "OK", successmessage);
 796 }
 797
 798
 799
 800 void extract_action(char *actbuf, char *cmdbuf)
 801 {
 802         int i;
 803
 804         strcpy(actbuf, cmdbuf);
 805         if (!strncasecmp(actbuf, "GET /", 5))
 806                 strcpy(actbuf, &actbuf[5]);
 807         if (!strncasecmp(actbuf, "PUT /", 5))
 808                 strcpy(actbuf, &actbuf[5]);
 809         if (!strncasecmp(actbuf, "POST /", 6))
 810                 strcpy(actbuf, &actbuf[6]);
 811
 812         for (i = 0; i < strlen(actbuf); ++i) {
 813                 if (actbuf[i] == ' ') {
 814                         actbuf[i] = 0;
 815                         i = 0;
 816                 }
 817                 if (actbuf[i] == '/') {
 818                         actbuf[i] = 0;
 819                         i = 0;
 820                 }
 821                 if (actbuf[i] == '?') {
 822                         actbuf[i] = 0;
 823                         i = 0;
 824                 }
 825                 if (actbuf[i] == '&') {
 826                         actbuf[i] = 0;
 827                         i = 0;
 828                 }
 829         }
 830 }
 831
 832
 833 void upload_handler(char *name, char *filename, char *partnum, char *disp,
 834                         void *content, char *cbtype, size_t length,
 835                         char *encoding, void *userdata)
 836 {
 837
 838         lprintf(5, "UPLOAD HANDLER CALLED\n");
 839         lprintf(5, "    name = %s\n", name);
 840         lprintf(5, "filename = %s\n", filename);
 841         lprintf(5, "encoding = %s\n", encoding);
 842         lprintf(5, "    type = %s\n", cbtype);
 843         lprintf(5, "  length = %ld\n", (long)length);
 844
 845         if (length > 0) {
 846                 WC->upload = malloc(length);
 847                 if (WC->upload != NULL) {
 848                         WC->upload_length = length;
 849                         memcpy(WC->upload, content, length);
 850                 }
 851                 else {
 852                         lprintf(9, "malloc() failed: %s\n",
 853                                 strerror(errno));
 854                 }
 855         }
 856 }
 857
 858
 859
 860
 861 /*
 862  * Entry point for WebCit transaction
 863  */
 864 void session_loop(struct httprequest *req, int gzip)
 865 {
 866         char cmd[SIZ];
 867         char action[SIZ];
 868         char buf[SIZ];
 869         int a, b;
 870         int ContentLength = 0;
 871         int BytesRead;
 872         char ContentType[512];
 873         char *content;
 874         char *content_end;
 875         struct httprequest *hptr;
 876         char browser_host[SIZ];
 877         char user_agent[SIZ];
 878
 879         /* We stuff these with the values coming from the client cookies,
 880          * so we can use them to reconnect a timed out session if we have to.
 881          */
 882         char c_host[SIZ];
 883         char c_port[SIZ];
 884         char c_username[SIZ];
 885         char c_password[SIZ];
 886         char c_roomname[SIZ];
 887         char cookie[SIZ];
 888
 889         strcpy(c_host, defaulthost);
 890         strcpy(c_port, defaultport);
 891         strcpy(c_username, "");
 892         strcpy(c_password, "");
 893         strcpy(c_roomname, "");
 894
 895         WC->upload_length = 0;
 896         WC->upload = NULL;
 897
 898         WC->is_wap = 0;
 899
 900         if (gzip) {
 901                 WC->gzcompressed = 1;
 902         }
 903         else {
 904                 WC->gzcompressed = 0;
 905         }
 906
 907         hptr = req;
 908         if (hptr == NULL) return;
 909
 910         strcpy(cmd, hptr->line);
 911         hptr = hptr->next;
 912         extract_action(action, cmd);
 913
 914         while (hptr != NULL) {
 915                 strcpy(buf, hptr->line);
 916                 hptr = hptr->next;
 917
 918                 if (!strncasecmp(buf, "Cookie: webcit=", 15)) {
 919                         strcpy(cookie, &buf[15]);
 920                         cookie_to_stuff(cookie, NULL,
 921                                       c_username, c_password, c_roomname);
 922                 }
 923                 else if (!strncasecmp(buf, "Content-length: ", 16)) {
 924                         ContentLength = atoi(&buf[16]);
 925                 }
 926                 else if (!strncasecmp(buf, "Content-type: ", 14)) {
 927                         safestrncpy(ContentType, &buf[14], sizeof ContentType);
 928                 }
 929                 else if (!strncasecmp(buf, "User-agent: ", 12)) {
 930                         safestrncpy(user_agent, &buf[12], sizeof user_agent);
 931                 }
 932                 else if (!strncasecmp(buf, "Host: ", 6)) {
 933                         safestrncpy(WC->http_host, &buf[6], sizeof WC->http_host);
 934                 }
 935                 /* Only WAP gateways explicitly name this content-type */
 936                 else if (strstr(buf, "text/vnd.wap.wml")) {
 937                         WC->is_wap = 1;
 938                 }
 939         }
 940
 941         if (ContentLength > 0) {
 942                 lprintf(5, "Content length: %d\n", ContentLength);
 943                 content = malloc(ContentLength + 1);
 944                 memset(content, 0, ContentLength+1);
 945                 BytesRead = 0;
 946
 947                 while (BytesRead < ContentLength) {
 948                         a=read(WC->http_sock, &content[BytesRead],
 949                                 ContentLength - BytesRead);
 950                         if (a <= 0) BytesRead = ContentLength;
 951                         else BytesRead += a;
 952                 }
 953
 954                 if (!strncasecmp(ContentType,
 955                               "application/x-www-form-urlencoded", 33)) {
 956                         addurls(content);
 957                 } else if (!strncasecmp(ContentType, "multipart", 9)) {
 958                         content_end = content + ContentLength;
 959                         mime_parser(content, content_end, *upload_handler,
 960                                         NULL, NULL, NULL, 0);
 961                 }
 962         } else {
 963                 content = NULL;
 964         }
 965
 966         /* make a note of where we are in case the user wants to save it */
 967         safestrncpy(WC->this_page, cmd, sizeof(WC->this_page));
 968         remove_token(WC->this_page, 2, ' ');
 969         remove_token(WC->this_page, 0, ' ');
 970
 971         /* If there are variables in the URL, we must grab them now */
 972         for (a = 0; a < strlen(cmd); ++a) {
 973                 if ((cmd[a] == '?') || (cmd[a] == '&')) {
 974                         for (b = a; b < strlen(cmd); ++b)
 975                                 if (isspace(cmd[b]))
 976                                         cmd[b] = 0;
 977                         addurls(&cmd[a + 1]);
 978                         cmd[a] = 0;
 979                 }
 980         }
 981
 982         /*
 983          * If we're not connected to a Citadel server, try to hook up the
 984          * connection now.  Preference is given to the host and port specified
 985          * by browser cookies, if cookies have been supplied.
 986          */
 987         if (!WC->connected) {
 988                 if (strlen(bstr("host")) > 0)
 989                         strcpy(c_host, bstr("host"));
 990                 if (strlen(bstr("port")) > 0)
 991                         strcpy(c_port, bstr("port"));
 992
 993                 if (!strcasecmp(c_host, "uds")) {
 994                         /* unix domain socket */
 995                         sprintf(buf, "%s/citadel.socket", c_port);
 996                         WC->serv_sock = uds_connectsock(buf);
 997                 }
 998                 else {
 999                         /* tcp socket */
1000                         WC->serv_sock = tcp_connectsock(c_host, c_port);
1001                 }
1002
1003                 if (WC->serv_sock < 0) {
1004                         do_logout();
1005                         goto SKIP_ALL_THIS_CRAP;
1006                 }
1007                 else {
1008                         WC->connected = 1;
1009                         serv_gets(buf); /* get the server welcome message */
1010                         locate_host(browser_host, WC->http_sock);
1011                         get_serv_info(browser_host, user_agent);
1012                 }
1013         }
1014
1015         /*
1016          * Functions which can be performed without logging in
1017          */
1018         if (!strcasecmp(action, "listsub")) {
1019                 do_listsub();
1020                 goto SKIP_ALL_THIS_CRAP;
1021         }
1022
1023         check_for_express_messages();
1024
1025         /*
1026          * If we're not logged in, but we have username and password cookies
1027          * supplied by the browser, try using them to log in.
1028          */
1029         if ((!WC->logged_in) && (strlen(c_username) > 0) && (strlen(c_password) > 0)) {
1030                 serv_printf("USER %s", c_username);
1031                 serv_gets(buf);
1032                 if (buf[0] == '3') {
1033                         serv_printf("PASS %s", c_password);
1034                         serv_gets(buf);
1035                         if (buf[0] == '2') {
1036                                 become_logged_in(c_username, c_password, buf);
1037                         }
1038                 }
1039         }
1040         /*
1041          * If we don't have a current room, but a cookie specifying the
1042          * current room is supplied, make an effort to go there.
1043          */
1044         if ((strlen(WC->wc_roomname) == 0) && (strlen(c_roomname) > 0)) {
1045                 serv_printf("GOTO %s", c_roomname);
1046                 serv_gets(buf);
1047                 if (buf[0] == '2') {
1048                         strcpy(WC->wc_roomname, c_roomname);
1049                 }
1050         }
1051         if (!strcasecmp(action, "static")) {
1052                 strcpy(buf, &cmd[12]);
1053                 for (a = 0; a < strlen(buf); ++a)
1054                         if (isspace(buf[a]))
1055                                 buf[a] = 0;
1056                 output_static(buf);
1057         } else if (!strcasecmp(action, "image")) {
1058                 output_image();
1059
1060         /*
1061          * All functions handled below this point ... make sure we log in
1062          * before doing anything else!
1063          */
1064         } else if ((!WC->logged_in) && (!strcasecmp(action, "login"))) {
1065                 do_login();
1066         } else if (!WC->logged_in) {
1067                 display_login(NULL);
1068         }
1069
1070         /*
1071          * Various commands...
1072          */
1073
1074         else if (!strcasecmp(action, "do_welcome")) {
1075                 do_welcome();
1076         } else if (!strcasecmp(action, "blank")) {
1077                 blank_page();
1078         } else if (!strcasecmp(action, "display_main_menu")) {
1079                 display_main_menu();
1080         } else if (!strcasecmp(action, "whobbs")) {
1081                 whobbs();
1082         } else if (!strcasecmp(action, "knrooms")) {
1083                 knrooms();
1084         } else if (!strcasecmp(action, "gotonext")) {
1085                 slrp_highest();
1086                 gotonext();
1087         } else if (!strcasecmp(action, "skip")) {
1088                 gotonext();
1089         } else if (!strcasecmp(action, "ungoto")) {
1090                 ungoto();
1091         } else if (!strcasecmp(action, "dotgoto")) {
1092                 slrp_highest();
1093                 smart_goto(bstr("room"));
1094         } else if (!strcasecmp(action, "dotskip")) {
1095                 smart_goto(bstr("room"));
1096         } else if (!strcasecmp(action, "termquit")) {
1097                 do_logout();
1098         } else if (!strcasecmp(action, "readnew")) {
1099                 readloop("readnew");
1100         } else if (!strcasecmp(action, "readold")) {
1101                 readloop("readold");
1102         } else if (!strcasecmp(action, "readfwd")) {
1103                 readloop("readfwd");
1104         } else if (!strcasecmp(action, "headers")) {
1105                 readloop("headers");
1106         } else if (!strcasecmp(action, "display_enter")) {
1107                 display_enter();
1108         } else if (!strcasecmp(action, "post")) {
1109                 post_message();
1110         } else if (!strcasecmp(action, "delete_msg")) {
1111                 delete_msg();
1112         } else if (!strcasecmp(action, "confirm_move_msg")) {
1113                 confirm_move_msg();
1114         } else if (!strcasecmp(action, "move_msg")) {
1115                 move_msg();
1116         } else if (!strcasecmp(action, "userlist")) {
1117                 userlist();
1118         } else if (!strcasecmp(action, "showuser")) {
1119                 showuser();
1120         } else if (!strcasecmp(action, "display_page")) {
1121                 display_page();
1122         } else if (!strcasecmp(action, "page_user")) {
1123                 page_user();
1124         } else if (!strcasecmp(action, "chat")) {
1125                 do_chat();
1126         } else if (!strcasecmp(action, "display_private")) {
1127                 display_private("", 0);
1128         } else if (!strcasecmp(action, "goto_private")) {
1129                 goto_private();
1130         } else if (!strcasecmp(action, "zapped_list")) {
1131                 zapped_list();
1132         } else if (!strcasecmp(action, "display_zap")) {
1133                 display_zap();
1134         } else if (!strcasecmp(action, "zap")) {
1135                 zap();
1136         } else if (!strcasecmp(action, "display_entroom")) {
1137                 display_entroom();
1138         } else if (!strcasecmp(action, "entroom")) {
1139                 entroom();
1140         } else if (!strcasecmp(action, "display_editroom")) {
1141                 display_editroom();
1142         } else if (!strcasecmp(action, "netedit")) {
1143                 netedit();
1144         } else if (!strcasecmp(action, "editroom")) {
1145                 editroom();
1146         } else if (!strcasecmp(action, "display_whok")) {
1147                 display_whok();
1148         } else if (!strcasecmp(action, "display_editinfo")) {
1149                 display_edit("Room info", "EINF 0", "RINF", "/editinfo");
1150         } else if (!strcasecmp(action, "editinfo")) {
1151                 save_edit("Room info", "EINF 1", 1);
1152         } else if (!strcasecmp(action, "display_editbio")) {
1153                 sprintf(buf, "RBIO %s", WC->wc_username);
1154                 display_edit("Your bio", "NOOP", buf, "editbio");
1155         } else if (!strcasecmp(action, "editbio")) {
1156                 save_edit("Your bio", "EBIO", 0);
1157         } else if (!strcasecmp(action, "confirm_delete_room")) {
1158                 confirm_delete_room();
1159         } else if (!strcasecmp(action, "delete_room")) {
1160                 delete_room();
1161         } else if (!strcasecmp(action, "validate")) {
1162                 validate();
1163         } else if (!strcasecmp(action, "display_editpic")) {
1164                 display_graphics_upload("your photo",
1165                                         "UIMG 0|_userpic_",
1166                                         "/editpic");
1167         } else if (!strcasecmp(action, "editpic")) {
1168                 do_graphics_upload("UIMG 1|_userpic_");
1169         } else if (!strcasecmp(action, "display_editroompic")) {
1170                 display_graphics_upload("the graphic for this room",
1171                                         "UIMG 0|_roompic_",
1172                                         "/editroompic");
1173         } else if (!strcasecmp(action, "editroompic")) {
1174                 do_graphics_upload("UIMG 1|_roompic_");
1175         } else if (!strcasecmp(action, "delete_floor")) {
1176                 delete_floor();
1177         } else if (!strcasecmp(action, "rename_floor")) {
1178                 rename_floor();
1179         } else if (!strcasecmp(action, "create_floor")) {
1180                 create_floor();
1181         } else if (!strcasecmp(action, "display_editfloorpic")) {
1182                 sprintf(buf, "UIMG 0|_floorpic_|%s",
1183                         bstr("which_floor"));
1184                 display_graphics_upload("the graphic for this floor",
1185                                         buf,
1186                                         "/editfloorpic");
1187         } else if (!strcasecmp(action, "editfloorpic")) {
1188                 sprintf(buf, "UIMG 1|_floorpic_|%s",
1189                         bstr("which_floor"));
1190                 do_graphics_upload(buf);
1191         } else if (!strcasecmp(action, "display_reg")) {
1192                 display_reg(0);
1193         } else if (!strcasecmp(action, "register")) {
1194                 register_user();
1195         } else if (!strcasecmp(action, "display_changepw")) {
1196                 display_changepw();
1197         } else if (!strcasecmp(action, "changepw")) {
1198                 changepw();
1199         } else if (!strcasecmp(action, "display_edit_node")) {
1200                 display_edit_node();
1201         } else if (!strcasecmp(action, "edit_node")) {
1202                 edit_node();
1203         } else if (!strcasecmp(action, "display_netconf")) {
1204                 display_netconf();
1205         } else if (!strcasecmp(action, "display_confirm_delete_node")) {
1206                 display_confirm_delete_node();
1207         } else if (!strcasecmp(action, "delete_node")) {
1208                 delete_node();
1209         } else if (!strcasecmp(action, "display_add_node")) {
1210                 display_add_node();
1211         } else if (!strcasecmp(action, "add_node")) {
1212                 add_node();
1213         } else if (!strcasecmp(action, "terminate_session")) {
1214                 slrp_highest();
1215                 terminate_session();
1216         } else if (!strcasecmp(action, "edit_me")) {
1217                 edit_me();
1218         } else if (!strcasecmp(action, "display_siteconfig")) {
1219                 display_siteconfig();
1220         } else if (!strcasecmp(action, "page_popup")) {
1221                 page_popup();
1222         } else if (!strcasecmp(action, "siteconfig")) {
1223                 siteconfig();
1224         } else if (!strcasecmp(action, "display_generic")) {
1225                 display_generic();
1226         } else if (!strcasecmp(action, "do_generic")) {
1227                 do_generic();
1228         } else if (!strcasecmp(action, "display_menubar")) {
1229                 display_menubar(1);
1230         } else if (!strcasecmp(action, "output_mimepart")) {
1231                 output_mimepart();
1232         } else if (!strcasecmp(action, "edit_vcard")) {
1233                 edit_vcard();
1234         } else if (!strcasecmp(action, "submit_vcard")) {
1235                 submit_vcard();
1236         } else if (!strcasecmp(action, "select_user_to_edit")) {
1237                 select_user_to_edit(NULL, NULL);
1238         } else if (!strcasecmp(action, "display_edituser")) {
1239                 display_edituser(NULL);
1240         } else if (!strcasecmp(action, "edituser")) {
1241                 edituser();
1242         } else if (!strcasecmp(action, "create_user")) {
1243                 create_user();
1244         } else if (!strcasecmp(action, "changeview")) {
1245                 change_view();
1246         } else if (!strcasecmp(action, "folders")) {
1247                 folders();
1248         } else if (!strcasecmp(action, "do_stuff_to_msgs")) {
1249                 do_stuff_to_msgs();
1250         } else if (!strcasecmp(action, "change_start_page")) {
1251                 change_start_page();
1252         } else if (!strcasecmp(action, "display_floorconfig")) {
1253                 display_floorconfig(NULL);
1254         } else if (!strcasecmp(action, "toggle_self_service")) {
1255                 toggle_self_service();
1256         } else if (!strcasecmp(action, "summary")) {
1257                 summary();
1258         } else if (!strcasecmp(action, "diagnostics")) {
1259                 output_headers(1);
1260
1261                 wprintf("You're in session %d<HR>\n", WC->wc_session);
1262                 wprintf("Command: <BR><PRE>\n");
1263                 escputs(cmd);
1264                 wprintf("</PRE><HR>\n");
1265                 wprintf("Variables: <BR><PRE>\n");
1266                 dump_vars();
1267                 wprintf("</PRE><HR>\n");
1268                 wDumpContent(1);
1269         }
1270         /* When all else fais, display the main menu. */
1271         else {
1272                 display_main_menu();
1273         }
1274
1275 SKIP_ALL_THIS_CRAP:
1276         fflush(stdout);
1277         if (content != NULL) {
1278                 free(content);
1279                 content = NULL;
1280         }
1281         free_urls();
1282         if (WC->upload_length > 0) {
1283                 free(WC->upload);
1284                 WC->upload_length = 0;
1285         }
1286
1287 #ifdef WITH_ZLIB
1288         if (WC->gzfd) {
1289                 gzclose(WC->gzfd);
1290                 WC->gzfd = NULL;
1291                 WC->gzcompressed = 0;
1292         }
1293 #endif
1294 }