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 <stdlib.h>
  12 #ifdef HAVE_UNISTD_H
  13 #include <unistd.h>
  14 #endif
  15 #include <stdio.h>
  16 #include <ctype.h>
  17 #include <string.h>
  18 #include <errno.h>
  19 #include <sys/stat.h>
  20 #include <stdarg.h>
  21 #include "webcit.h"
  22 #include "child.h"
  23
  24 int wc_session;
  25 char wc_host[256];
  26 char wc_port[256];
  27 char wc_username[256];
  28 char wc_password[256];
  29 char wc_roomname[256];
  30 int TransactionCount = 0;
  31 int connected = 0;
  32 int logged_in = 0;
  33 int axlevel;
  34
  35 struct webcontent *wlist = NULL;
  36 struct webcontent *wlast = NULL;
  37
  38 struct urlcontent *urlstrings = NULL;
  39
  40 static const char *defaulthost = DEFAULT_HOST;
  41 static const char *defaultport = DEFAULT_PORT;
  42
  43
  44 void unescape_input(char *buf)
  45 {
  46         int a,b;
  47         char hex[3];
  48
  49         while ((isspace(buf[strlen(buf)-1]))&&(strlen(buf)>0))
  50                 buf[strlen(buf)-1] = 0;
  51
  52         for (a=0; a<strlen(buf); ++a) {
  53                 if (buf[a]=='+') buf[a]=' ';
  54                 if (buf[a]=='%') {
  55                         hex[0]=buf[a+1];
  56                         hex[1]=buf[a+2];
  57                         hex[2]=0;
  58                         sscanf(hex,"%02x",&b);
  59                         buf[a] = (char) b;
  60                         strcpy(&buf[a+1],&buf[a+3]);
  61                         }
  62                 }
  63
  64         }
  65
  66
  67 void addurls(char *url) {
  68         char *up, *ptr;
  69         char buf[256];
  70         int a,b;
  71         struct urlcontent *u;
  72
  73         up = url;
  74         while (strlen(up)>0) {
  75
  76                 /* locate the = sign */
  77                 strncpy(buf,up,255);
  78                 b = (-1);
  79                 for (a=255; a>=0; --a) if (buf[a]=='=') b=a;
  80                 if (b<0) return;
  81                 buf[b]=0;
  82
  83                 u = (struct urlcontent *)malloc(sizeof(struct urlcontent));
  84                 u->next = urlstrings;
  85                 urlstrings = u;
  86                 strcpy(u->url_key, buf);
  87
  88                 /* now chop that part off */
  89                 for (a=0; a<=b; ++a) ++up;
  90
  91                 /* locate the & sign */
  92                 ptr = up;
  93                 b = strlen(up);
  94                 for (a=0; a<strlen(up); ++a) {
  95                         if (!strncmp(ptr,"&",1)) {
  96                                 b=a;
  97                                 break;
  98                                 }
  99                         ++ptr;
 100                         }
 101                 ptr = up;
 102                 for (a=0; a<b; ++a) ++ptr;
 103                 strcpy(ptr,"");
 104
 105                 u->url_data = malloc(strlen(up)+1);
 106                 strcpy(u->url_data, up);
 107                 u->url_data[b] = 0;
 108                 unescape_input(u->url_data);
 109                 up = ptr;
 110                 ++up;
 111                 }
 112         }
 113
 114 void free_urls(void) {
 115         struct urlcontent *u;
 116
 117         while (urlstrings != NULL) {
 118                 free(urlstrings->url_data);
 119                 u = urlstrings->next;
 120                 free(urlstrings);
 121                 urlstrings = u;
 122                 }
 123         }
 124
 125 /*
 126  * Diagnostic function to display the contents of all variables
 127  */
 128 void dump_vars(void) {
 129         struct urlcontent *u;
 130
 131         for (u = urlstrings; u != NULL; u = u->next) {
 132                 wprintf("%38s = %s\n", u->url_key, u->url_data);
 133                 }
 134         }
 135
 136 char *bstr(char *key) {
 137         struct urlcontent *u;
 138
 139         for (u = urlstrings; u != NULL; u = u->next) {
 140                 if (!strcasecmp(u->url_key, key)) return(u->url_data);
 141                 }
 142         return("");
 143         }
 144
 145
 146 void wprintf(const char *format, ...) {
 147         va_list arg_ptr;
 148         struct webcontent *wptr;
 149
 150         wptr = (struct webcontent *)malloc(sizeof(struct webcontent));
 151         wptr->next = NULL;
 152         if (wlist == NULL) {
 153                 wlist = wptr;
 154                 wlast = wptr;
 155                 }
 156         else {
 157                 wlast->next = wptr;
 158                 wlast = wptr;
 159                 }
 160
 161         va_start(arg_ptr, format);
 162         vsprintf(wptr->w_data, format, arg_ptr);
 163         va_end(arg_ptr);
 164         }
 165
 166 int wContentLength(void) {
 167         struct webcontent *wptr;
 168         int len = 0;
 169
 170         for (wptr = wlist; wptr != NULL; wptr = wptr->next) {
 171                 len = len + strlen(wptr->w_data);
 172                 }
 173
 174         return(len);
 175         }
 176
 177 void wDumpContent(void) {
 178         struct webcontent *wptr;
 179
 180         printf("Content-type: text/html\n");
 181         printf("Content-length: %d\n", wContentLength());
 182         printf("\n");
 183
 184         while (wlist != NULL) {
 185                 fwrite(wlist->w_data, strlen(wlist->w_data), 1, stdout);
 186                 wptr = wlist->next;
 187                 free(wlist);
 188                 wlist = wptr;
 189                 }
 190         wlast = NULL;
 191         }
 192
 193
 194 void escputs1(char *strbuf, int nbsp)
 195 {
 196         int a;
 197
 198         for (a=0; a<strlen(strbuf); ++a) {
 199                 if (strbuf[a]=='<') wprintf("&lt;");
 200                 else if (strbuf[a]=='>') wprintf("&gt;");
 201                 else if (strbuf[a]=='&') wprintf("&amp;");
 202                 else if (strbuf[a]==34) wprintf("&quot;");
 203                 else if (strbuf[a]==LB) wprintf("<");
 204                 else if (strbuf[a]==RB) wprintf(">");
 205                 else if (strbuf[a]==QU) wprintf("\"");
 206                 else if ((strbuf[a]==32)&&(nbsp==1)) {
 207                         wprintf("&nbsp;");
 208                         }
 209                 else {
 210                         wprintf("%c", strbuf[a]);
 211                         }
 212                 }
 213         }
 214
 215 void escputs(char *strbuf)
 216 {
 217         escputs1(strbuf,0);
 218         }
 219
 220
 221
 222 char *urlesc(char *strbuf)
 223 {
 224         int a,b,c;
 225         char *ec = " #&;`'|*?-~<>^()[]{}$\\";
 226         static char outbuf[512];
 227
 228         strcpy(outbuf,"");
 229
 230         for (a=0; a<strlen(strbuf); ++a) {
 231                 c = 0;
 232                 for (b=0; b<strlen(ec); ++b) {
 233                         if (strbuf[a]==ec[b]) c=1;
 234                         }
 235                 b = strlen(outbuf);
 236                 if (c==1) sprintf(&outbuf[b],"%%%02x",strbuf[a]);
 237                 else sprintf(&outbuf[b],"%c",strbuf[a]);
 238                 }
 239         return(outbuf);
 240         }
 241
 242 void urlescputs(char *strbuf)
 243 {
 244         wprintf("%s",urlesc(strbuf));
 245         }
 246
 247
 248 void getz(char *buf) {
 249         if (fgets(buf, 256, stdin) == NULL) strcpy(buf, "");
 250         else {
 251                 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
 252                         buf[strlen(buf)-1] = 0;
 253                 }
 254         }
 255
 256 /*
 257  * Output all that important stuff that the browser will want to see
 258  */
 259 void output_headers(void) {
 260
 261         static char *unset = "; expires=28-May-1971 18:10:00 GMT";
 262
 263         printf("Server: %s\n", SERVER);
 264         printf("Connection: close\n");
 265         printf("Set-cookie: wc_session=%d\n", wc_session);
 266
 267         if (strlen(wc_host)>0) printf("Set-cookie: wc_host=%s\n", wc_host);
 268         else printf("Set-cookie: wc_host=%s\n", unset);
 269
 270         if (strlen(wc_port)>0) printf("Set-cookie: wc_port=%s\n", wc_port);
 271         else printf("Set-cookie: wc_port=%s\n", unset);
 272
 273         if (strlen(wc_username)>0) printf("Set-cookie: wc_username=%s\n",
 274                 wc_username);
 275         else printf("Set-cookie: wc_username=%s\n", unset);
 276
 277         if (strlen(wc_password)>0) printf("Set-cookie: wc_password=%s\n",
 278                 wc_password);
 279         else printf("Set-cookie: wc_password=%s\n", unset);
 280
 281         if (strlen(wc_roomname)>0) printf("Set-cookie: wc_roomname=%s\n",
 282                 wc_roomname);
 283         else printf("Set-cookie: wc_roomname=%s\n", unset);
 284         }
 285
 286 void output_static(char *what) {
 287         char buf[256];
 288         FILE *fp;
 289         struct stat statbuf;
 290         off_t bytes;
 291
 292         sprintf(buf, "static/%s", what);
 293         fp = fopen(buf, "rb");
 294         if (fp == NULL) {
 295                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 296                 output_headers();
 297                 printf("Content-Type: text/plain\n");
 298                 sprintf(buf, "%s: %s\n", what, strerror(errno));
 299                 printf("Content-length: %d\n", strlen(buf));
 300                 printf("\n");
 301                 fwrite(buf, strlen(buf), 1, stdout);
 302                 }
 303         else {
 304                 printf("HTTP/1.0 200 OK\n");
 305                 output_headers();
 306
 307                 if (!strncasecmp(&what[strlen(what)-4], ".gif", 4))
 308                         printf("Content-type: image/gif\n");
 309                 else if (!strncasecmp(&what[strlen(what)-5], ".html", 5))
 310                         printf("Content-type: text/html\n");
 311                 else
 312                         printf("Content-type: application/octet-stream\n");
 313
 314                 fstat(fileno(fp), &statbuf);
 315                 bytes = statbuf.st_size;
 316                 printf("Content-length: %ld\n", (long)bytes);
 317                 printf("\n");
 318                 while (bytes--) {
 319                         putc(getc(fp), stdout);
 320                         }
 321                 fflush(stdout);
 322                 fclose(fp);
 323                 }
 324         }
 325
 326 void output_image() {
 327         char buf[256];
 328         char xferbuf[4096];
 329         off_t bytes;
 330         off_t thisblock;
 331         off_t accomplished = 0L;
 332
 333
 334         serv_printf("OIMG %s|%s", bstr("name"), bstr("parm"));
 335         serv_gets(buf);
 336         if (buf[0]=='2') {
 337                 bytes = extract_long(&buf[4], 0);
 338                 printf("HTTP/1.0 200 OK\n");
 339                 output_headers();
 340                 printf("Content-type: image/gif\n");
 341                 printf("Content-length: %ld\n", bytes);
 342                 printf("\n");
 343
 344                 while (bytes > (off_t)0) {
 345                         thisblock = (off_t)sizeof(xferbuf);
 346                         if (thisblock > bytes) thisblock = bytes;
 347                         serv_printf("READ %ld|%ld", accomplished, thisblock);
 348                         serv_gets(buf);
 349                         if (buf[0]=='6') thisblock = extract_long(&buf[4],0);
 350                         serv_read(xferbuf, (int)thisblock);
 351                         fwrite(xferbuf, thisblock, 1, stdout);
 352                         bytes = bytes - thisblock;
 353                         accomplished = accomplished + thisblock;
 354                         }
 355                 fflush(stdout);
 356                 serv_puts("CLOS");
 357                 serv_gets(buf);
 358                 }
 359         else {
 360                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 361                 output_headers();
 362                 printf("Content-Type: text/plain\n");
 363                 sprintf(buf, "Error retrieving image\n");
 364                 printf("Content-length: %d\n", strlen(buf));
 365                 printf("\n");
 366                 fwrite(buf, strlen(buf), 1, stdout);
 367                 }
 368
 369         }
 370
 371 void extract_action(char *actbuf, char *cmdbuf) {
 372         int i;
 373
 374         strcpy(actbuf, cmdbuf);
 375         if (!strncasecmp(actbuf, "GET /", 5)) strcpy(actbuf, &actbuf[5]);
 376         if (!strncasecmp(actbuf, "PUT /", 5)) strcpy(actbuf, &actbuf[5]);
 377         if (!strncasecmp(actbuf, "POST /", 6)) strcpy(actbuf, &actbuf[6]);
 378
 379         for (i=0; i<strlen(actbuf); ++i) {
 380                 if (actbuf[i]==' ') { actbuf[i]=0; i=0; }
 381                 if (actbuf[i]=='/') { actbuf[i]=0; i=0; }
 382                 if (actbuf[i]=='?') { actbuf[i]=0; i=0; }
 383                 if (actbuf[i]=='&') { actbuf[i]=0; i=0; }
 384                 }
 385         }
 386
 387
 388 void session_loop(void) {
 389         char cmd[256];
 390         char action[256];
 391         char buf[256];
 392         int a, b;
 393         int ContentLength = 0;
 394         char *content;
 395 FILE *fp;
 396
 397         /* We stuff these with the values coming from the client cookies,
 398          * so we can use them to reconnect a timed out session if we have to.
 399          */
 400         char c_host[256];
 401         char c_port[256];
 402         char c_username[256];
 403         char c_password[256];
 404         char c_roomname[256];
 405
 406         strcpy(c_host, defaulthost);
 407         strcpy(c_port, defaultport);
 408         strcpy(c_username, "");
 409         strcpy(c_password, "");
 410         strcpy(c_roomname, "");
 411
 412         getz(cmd);
 413         extract_action(action, cmd);
 414
 415         do {
 416                 getz(buf);
 417
 418                 if (!strncasecmp(buf, "Cookie: wc_host=", 16))
 419                         strcpy(c_host, &buf[16]);
 420                 if (!strncasecmp(buf, "Cookie: wc_port=", 16))
 421                         strcpy(c_port, &buf[16]);
 422                 if (!strncasecmp(buf, "Cookie: wc_username=", 20))
 423                         strcpy(c_username, &buf[20]);
 424                 if (!strncasecmp(buf, "Cookie: wc_password=", 20))
 425                         strcpy(c_password, &buf[20]);
 426                 if (!strncasecmp(buf, "Cookie: wc_roomname=", 20))
 427                         strcpy(c_roomname, &buf[20]);
 428
 429                 if (!strncasecmp(buf, "Content-length: ", 16)) {
 430                         ContentLength = atoi(&buf[16]);
 431                         }
 432
 433                 } while(strlen(buf)>0);
 434
 435         ++TransactionCount;
 436
 437         if (ContentLength > 0) {
 438                 content = malloc(ContentLength+1);
 439                 fread(content, ContentLength, 1, stdin);
 440 fp = fopen("content", "wb");
 441 fwrite(content, ContentLength, 1, fp);
 442 fclose(fp);
 443                 content[ContentLength] = 0;
 444                 addurls(content);
 445                 }
 446         else {
 447                 content = NULL;
 448                 }
 449
 450         /*
 451          * If we're not connected to a Citadel server, try to hook up the
 452          * connection now.  Preference is given to the host and port specified
 453          * by browser cookies, if cookies have been supplied.
 454          */
 455         if (!connected) {
 456                 serv_sock = connectsock(c_host, c_port, "tcp");
 457                 connected = 1;
 458                 serv_gets(buf); /* get the server welcome message */
 459                 strcpy(wc_host, c_host);
 460                 strcpy(wc_port, c_port);
 461                 get_serv_info();
 462                 }
 463
 464
 465         /*
 466          * If we're not logged in, but we have username and password cookies
 467          * supplied by the browser, try using them to log in.
 468          */
 469         if ((!logged_in)&&(strlen(c_username)>0)&&(strlen(c_password)>0)) {
 470                 serv_printf("USER %s", c_username);
 471                 serv_gets(buf);
 472                 if (buf[0]=='3') {
 473                         serv_printf("PASS %s", c_password);
 474                         serv_gets(buf);
 475                         if (buf[0]=='2') {
 476                                 become_logged_in(c_username, c_password, buf);
 477                                 }
 478                         }
 479                 }
 480
 481         /*
 482          * If we don't have a current room, but a cookie specifying the
 483          * current room is supplied, make an effort to go there.
 484          */
 485         if ((strlen(wc_roomname)==0) && (strlen(c_roomname)>0) ) {
 486                 serv_printf("GOTO %s", c_roomname);
 487                 serv_gets(buf);
 488                 if (buf[0]=='2') {
 489                         strcpy(wc_roomname, c_roomname);
 490                         }
 491                 }
 492
 493         /* If there are variables in the URL, we must grab them now */
 494         for (a=0; a<strlen(cmd); ++a) if ((cmd[a]=='?')||(cmd[a]=='&')) {
 495                 for (b=a; b<strlen(cmd); ++b) if (isspace(cmd[b])) cmd[b]=0;
 496                 addurls(&cmd[a+1]);
 497                 cmd[a] = 0;
 498                 }
 499
 500         if (!strcasecmp(action, "static")) {
 501                 strcpy(buf, &cmd[12]);
 502                 for (a=0; a<strlen(buf); ++a) if (isspace(buf[a])) buf[a]=0;
 503                 output_static(buf);
 504                 }
 505
 506         else if (!strcasecmp(action, "image")) {
 507                 output_image();
 508                 }
 509
 510         else if ((!logged_in)&&(!strcasecmp(action, "login"))) {
 511                 do_login();
 512                 }
 513
 514         else if (!logged_in) {
 515                 display_login(NULL);
 516                 }
 517
 518         /* Various commands... */
 519
 520         else if (!strcasecmp(action, "do_welcome")) {
 521                 do_welcome();
 522                 }
 523
 524         else if (!strcasecmp(action, "display_main_menu")) {
 525                 display_main_menu();
 526                 }
 527
 528         else if (!strcasecmp(action, "advanced")) {
 529                 display_advanced_menu();
 530                 }
 531
 532         else if (!strcasecmp(action, "whobbs")) {
 533                 whobbs();
 534                 }
 535
 536         else if (!strcasecmp(action, "knrooms")) {
 537                 list_all_rooms_by_floor();
 538                 }
 539
 540         else if (!strcasecmp(action, "gotonext")) {
 541                 slrp_highest();
 542                 gotonext();
 543                 }
 544
 545         else if (!strcasecmp(action, "skip")) {
 546                 gotonext();
 547                 }
 548
 549         else if (!strcasecmp(action, "ungoto")) {
 550                 ungoto();
 551                 }
 552
 553         else if (!strcasecmp(action, "dotgoto")) {
 554                 slrp_highest();
 555                 dotgoto();
 556                 }
 557
 558         else if (!strcasecmp(action, "termquit")) {
 559                 do_logout();
 560                 }
 561
 562         else if (!strcasecmp(action, "readnew")) {
 563                 readloop("readnew");
 564                 }
 565
 566         else if (!strcasecmp(action, "readold")) {
 567                 readloop("readold");
 568                 }
 569
 570         else if (!strcasecmp(action, "readfwd")) {
 571                 readloop("readfwd");
 572                 }
 573
 574         else if (!strcasecmp(action, "display_enter")) {
 575                 display_enter();
 576                 }
 577
 578         else if (!strcasecmp(action, "post")) {
 579                 post_message();
 580                 }
 581
 582         /* When all else fails... */
 583         else {
 584                 printf("HTTP/1.0 200 OK\n");
 585                 output_headers();
 586
 587                 wprintf("<HTML><HEAD><TITLE>WebCit</TITLE></HEAD><BODY BACKGROUND=\"/image&name=background\" TEXT=\"#000000\" LINK=\"#004400\">\n");
 588                 wprintf("TransactionCount is %d<BR>\n", TransactionCount);
 589                 wprintf("You're in session %d<HR>\n", wc_session);
 590                 wprintf("Command: <BR><PRE>\n");
 591                 escputs(cmd);
 592                 wprintf("</PRE><HR>\n");
 593                 wprintf("Variables: <BR><PRE>\n");
 594                 dump_vars();
 595                 wprintf("</PRE><HR>\n");
 596                 wprintf("</BODY></HTML>\n");
 597                 wDumpContent();
 598                 }
 599
 600         fflush(stdout);
 601         if (content != NULL) {
 602                 free(content);
 603                 content = NULL;
 604                 }
 605         free_urls();
 606         }
 607
 608 int main(int argc, char *argv[]) {
 609
 610         if (argc < 2 || argc > 4) {
 611                 fprintf(stderr,
 612                         "webcit: usage: webcit <session_id> [host [port]]\n");
 613                 return 1;
 614                 }
 615
 616         wc_session = atoi(argv[1]);
 617
 618         if (argc > 2) {
 619                 defaulthost = argv[2];
 620                 if (argc > 3)
 621                         defaultport = argv[3];
 622                 }
 623
 624         strcpy(wc_host, "");
 625         strcpy(wc_port, "");
 626         strcpy(wc_username, "");
 627         strcpy(wc_password, "");
 628         strcpy(wc_roomname, "");
 629
 630         while (1) {
 631                 session_loop();
 632                 }
 633         }