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