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(int print_standard_html_head) {
 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         if (print_standard_html_head) {
 286                 wprintf("<HTML><HEAD><TITLE>");
 287                 escputs("WebCit");
 288                 wprintf("</TITLE></HEAD>");
 289                 wprintf("<BODY BACKGROUND=\"/image&name=background\" TEXT=\"#000000\" LINK=\"#004400\">\n");
 290                 }
 291
 292         }
 293
 294 void output_static(char *what) {
 295         char buf[256];
 296         FILE *fp;
 297         struct stat statbuf;
 298         off_t bytes;
 299
 300         sprintf(buf, "static/%s", what);
 301         fp = fopen(buf, "rb");
 302         if (fp == NULL) {
 303                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 304                 output_headers(0);
 305                 printf("Content-Type: text/plain\n");
 306                 sprintf(buf, "%s: %s\n", what, strerror(errno));
 307                 printf("Content-length: %d\n", strlen(buf));
 308                 printf("\n");
 309                 fwrite(buf, strlen(buf), 1, stdout);
 310                 }
 311         else {
 312                 printf("HTTP/1.0 200 OK\n");
 313                 output_headers(0);
 314
 315                 if (!strncasecmp(&what[strlen(what)-4], ".gif", 4))
 316                         printf("Content-type: image/gif\n");
 317                 else if (!strncasecmp(&what[strlen(what)-5], ".html", 5))
 318                         printf("Content-type: text/html\n");
 319                 else
 320                         printf("Content-type: application/octet-stream\n");
 321
 322                 fstat(fileno(fp), &statbuf);
 323                 bytes = statbuf.st_size;
 324                 printf("Content-length: %ld\n", (long)bytes);
 325                 printf("\n");
 326                 while (bytes--) {
 327                         putc(getc(fp), stdout);
 328                         }
 329                 fflush(stdout);
 330                 fclose(fp);
 331                 }
 332         }
 333
 334 void output_image() {
 335         char buf[256];
 336         char xferbuf[4096];
 337         off_t bytes;
 338         off_t thisblock;
 339         off_t accomplished = 0L;
 340
 341
 342         serv_printf("OIMG %s|%s", bstr("name"), bstr("parm"));
 343         serv_gets(buf);
 344         if (buf[0]=='2') {
 345                 bytes = extract_long(&buf[4], 0);
 346                 printf("HTTP/1.0 200 OK\n");
 347                 output_headers(0);
 348                 printf("Content-type: image/gif\n");
 349                 printf("Content-length: %ld\n", bytes);
 350                 printf("\n");
 351
 352                 while (bytes > (off_t)0) {
 353                         thisblock = (off_t)sizeof(xferbuf);
 354                         if (thisblock > bytes) thisblock = bytes;
 355                         serv_printf("READ %ld|%ld", accomplished, thisblock);
 356                         serv_gets(buf);
 357                         if (buf[0]=='6') thisblock = extract_long(&buf[4],0);
 358                         serv_read(xferbuf, (int)thisblock);
 359                         fwrite(xferbuf, thisblock, 1, stdout);
 360                         bytes = bytes - thisblock;
 361                         accomplished = accomplished + thisblock;
 362                         }
 363                 fflush(stdout);
 364                 serv_puts("CLOS");
 365                 serv_gets(buf);
 366                 }
 367         else {
 368                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 369                 output_headers(0);
 370                 printf("Content-Type: text/plain\n");
 371                 sprintf(buf, "Error retrieving image\n");
 372                 printf("Content-length: %d\n", strlen(buf));
 373                 printf("\n");
 374                 fwrite(buf, strlen(buf), 1, stdout);
 375                 }
 376
 377         }
 378
 379 void extract_action(char *actbuf, char *cmdbuf) {
 380         int i;
 381
 382         strcpy(actbuf, cmdbuf);
 383         if (!strncasecmp(actbuf, "GET /", 5)) strcpy(actbuf, &actbuf[5]);
 384         if (!strncasecmp(actbuf, "PUT /", 5)) strcpy(actbuf, &actbuf[5]);
 385         if (!strncasecmp(actbuf, "POST /", 6)) strcpy(actbuf, &actbuf[6]);
 386
 387         for (i=0; i<strlen(actbuf); ++i) {
 388                 if (actbuf[i]==' ') { actbuf[i]=0; i=0; }
 389                 if (actbuf[i]=='/') { actbuf[i]=0; i=0; }
 390                 if (actbuf[i]=='?') { actbuf[i]=0; i=0; }
 391                 if (actbuf[i]=='&') { actbuf[i]=0; i=0; }
 392                 }
 393         }
 394
 395
 396 void session_loop(void) {
 397         char cmd[256];
 398         char action[256];
 399         char buf[256];
 400         int a, b;
 401         int ContentLength = 0;
 402         char *content;
 403 FILE *fp;
 404
 405         /* We stuff these with the values coming from the client cookies,
 406          * so we can use them to reconnect a timed out session if we have to.
 407          */
 408         char c_host[256];
 409         char c_port[256];
 410         char c_username[256];
 411         char c_password[256];
 412         char c_roomname[256];
 413
 414         strcpy(c_host, defaulthost);
 415         strcpy(c_port, defaultport);
 416         strcpy(c_username, "");
 417         strcpy(c_password, "");
 418         strcpy(c_roomname, "");
 419
 420         getz(cmd);
 421         extract_action(action, cmd);
 422
 423         do {
 424                 getz(buf);
 425
 426                 if (!strncasecmp(buf, "Cookie: wc_host=", 16))
 427                         strcpy(c_host, &buf[16]);
 428                 if (!strncasecmp(buf, "Cookie: wc_port=", 16))
 429                         strcpy(c_port, &buf[16]);
 430                 if (!strncasecmp(buf, "Cookie: wc_username=", 20))
 431                         strcpy(c_username, &buf[20]);
 432                 if (!strncasecmp(buf, "Cookie: wc_password=", 20))
 433                         strcpy(c_password, &buf[20]);
 434                 if (!strncasecmp(buf, "Cookie: wc_roomname=", 20))
 435                         strcpy(c_roomname, &buf[20]);
 436
 437                 if (!strncasecmp(buf, "Content-length: ", 16)) {
 438                         ContentLength = atoi(&buf[16]);
 439                         }
 440
 441                 } while(strlen(buf)>0);
 442
 443         ++TransactionCount;
 444
 445         if (ContentLength > 0) {
 446                 content = malloc(ContentLength+1);
 447                 fread(content, ContentLength, 1, stdin);
 448 fp = fopen("content", "wb");
 449 fwrite(content, ContentLength, 1, fp);
 450 fclose(fp);
 451                 content[ContentLength] = 0;
 452                 addurls(content);
 453                 }
 454         else {
 455                 content = NULL;
 456                 }
 457
 458         /*
 459          * If we're not connected to a Citadel server, try to hook up the
 460          * connection now.  Preference is given to the host and port specified
 461          * by browser cookies, if cookies have been supplied.
 462          */
 463         if (!connected) {
 464                 serv_sock = connectsock(c_host, c_port, "tcp");
 465                 connected = 1;
 466                 serv_gets(buf); /* get the server welcome message */
 467                 strcpy(wc_host, c_host);
 468                 strcpy(wc_port, c_port);
 469                 get_serv_info();
 470                 }
 471
 472
 473         /*
 474          * If we're not logged in, but we have username and password cookies
 475          * supplied by the browser, try using them to log in.
 476          */
 477         if ((!logged_in)&&(strlen(c_username)>0)&&(strlen(c_password)>0)) {
 478                 serv_printf("USER %s", c_username);
 479                 serv_gets(buf);
 480                 if (buf[0]=='3') {
 481                         serv_printf("PASS %s", c_password);
 482                         serv_gets(buf);
 483                         if (buf[0]=='2') {
 484                                 become_logged_in(c_username, c_password, buf);
 485                                 }
 486                         }
 487                 }
 488
 489         /*
 490          * If we don't have a current room, but a cookie specifying the
 491          * current room is supplied, make an effort to go there.
 492          */
 493         if ((strlen(wc_roomname)==0) && (strlen(c_roomname)>0) ) {
 494                 serv_printf("GOTO %s", c_roomname);
 495                 serv_gets(buf);
 496                 if (buf[0]=='2') {
 497                         strcpy(wc_roomname, c_roomname);
 498                         }
 499                 }
 500
 501         /* If there are variables in the URL, we must grab them now */
 502         for (a=0; a<strlen(cmd); ++a) if ((cmd[a]=='?')||(cmd[a]=='&')) {
 503                 for (b=a; b<strlen(cmd); ++b) if (isspace(cmd[b])) cmd[b]=0;
 504                 addurls(&cmd[a+1]);
 505                 cmd[a] = 0;
 506                 }
 507
 508         if (!strcasecmp(action, "static")) {
 509                 strcpy(buf, &cmd[12]);
 510                 for (a=0; a<strlen(buf); ++a) if (isspace(buf[a])) buf[a]=0;
 511                 output_static(buf);
 512                 }
 513
 514         else if (!strcasecmp(action, "image")) {
 515                 output_image();
 516                 }
 517
 518         else if ((!logged_in)&&(!strcasecmp(action, "login"))) {
 519                 do_login();
 520                 }
 521
 522         else if (!logged_in) {
 523                 display_login(NULL);
 524                 }
 525
 526         /* Various commands... */
 527
 528         else if (!strcasecmp(action, "do_welcome")) {
 529                 do_welcome();
 530                 }
 531
 532         else if (!strcasecmp(action, "display_main_menu")) {
 533                 display_main_menu();
 534                 }
 535
 536         else if (!strcasecmp(action, "advanced")) {
 537                 display_advanced_menu();
 538                 }
 539
 540         else if (!strcasecmp(action, "whobbs")) {
 541                 whobbs();
 542                 }
 543
 544         else if (!strcasecmp(action, "knrooms")) {
 545                 list_all_rooms_by_floor();
 546                 }
 547
 548         else if (!strcasecmp(action, "gotonext")) {
 549                 slrp_highest();
 550                 gotonext();
 551                 }
 552
 553         else if (!strcasecmp(action, "skip")) {
 554                 gotonext();
 555                 }
 556
 557         else if (!strcasecmp(action, "ungoto")) {
 558                 ungoto();
 559                 }
 560
 561         else if (!strcasecmp(action, "dotgoto")) {
 562                 slrp_highest();
 563                 dotgoto();
 564                 }
 565
 566         else if (!strcasecmp(action, "termquit")) {
 567                 do_logout();
 568                 }
 569
 570         else if (!strcasecmp(action, "readnew")) {
 571                 readloop("readnew");
 572                 }
 573
 574         else if (!strcasecmp(action, "readold")) {
 575                 readloop("readold");
 576                 }
 577
 578         else if (!strcasecmp(action, "readfwd")) {
 579                 readloop("readfwd");
 580                 }
 581
 582         else if (!strcasecmp(action, "display_enter")) {
 583                 display_enter();
 584                 }
 585
 586         else if (!strcasecmp(action, "post")) {
 587                 post_message();
 588                 }
 589
 590         else if (!strcasecmp(action, "confirm_delete_msg")) {
 591                 confirm_delete_msg();
 592                 }
 593
 594         else if (!strcasecmp(action, "delete_msg")) {
 595                 delete_msg();
 596                 }
 597
 598         else if (!strcasecmp(action, "confirm_move_msg")) {
 599                 confirm_move_msg();
 600                 }
 601
 602         else if (!strcasecmp(action, "move_msg")) {
 603                 move_msg();
 604                 }
 605
 606         else if (!strcasecmp(action, "userlist")) {
 607                 userlist();
 608                 }
 609
 610         else if (!strcasecmp(action, "showuser")) {
 611                 showuser();
 612                 }
 613
 614         /* When all else fails... */
 615         else {
 616                 printf("HTTP/1.0 200 OK\n");
 617                 output_headers(1);
 618
 619                 wprintf("TransactionCount is %d<BR>\n", TransactionCount);
 620                 wprintf("You're in session %d<HR>\n", wc_session);
 621                 wprintf("Command: <BR><PRE>\n");
 622                 escputs(cmd);
 623                 wprintf("</PRE><HR>\n");
 624                 wprintf("Variables: <BR><PRE>\n");
 625                 dump_vars();
 626                 wprintf("</PRE><HR>\n");
 627                 wprintf("</BODY></HTML>\n");
 628                 wDumpContent();
 629                 }
 630
 631         fflush(stdout);
 632         if (content != NULL) {
 633                 free(content);
 634                 content = NULL;
 635                 }
 636         free_urls();
 637         }
 638
 639 int main(int argc, char *argv[]) {
 640
 641         if (argc < 2 || argc > 4) {
 642                 fprintf(stderr,
 643                         "webcit: usage: webcit <session_id> [host [port]]\n");
 644                 return 1;
 645                 }
 646
 647         wc_session = atoi(argv[1]);
 648
 649         if (argc > 2) {
 650                 defaulthost = argv[2];
 651                 if (argc > 3)
 652                         defaultport = argv[3];
 653                 }
 654
 655         strcpy(wc_host, "");
 656         strcpy(wc_port, "");
 657         strcpy(wc_username, "");
 658         strcpy(wc_password, "");
 659         strcpy(wc_roomname, "");
 660
 661         while (1) {
 662                 session_loop();
 663                 }
 664         }