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
  41 void unescape_input(char *buf)
  42 {
  43         int a,b;
  44         char hex[3];
  45
  46         while ((isspace(buf[strlen(buf)-1]))&&(strlen(buf)>0))
  47                 buf[strlen(buf)-1] = 0;
  48
  49         for (a=0; a<strlen(buf); ++a) {
  50                 if (buf[a]=='+') buf[a]=' ';
  51                 if (buf[a]=='%') {
  52                         hex[0]=buf[a+1];
  53                         hex[1]=buf[a+2];
  54                         hex[2]=0;
  55                         sscanf(hex,"%02x",&b);
  56                         buf[a] = (char) b;
  57                         strcpy(&buf[a+1],&buf[a+3]);
  58                         }
  59                 }
  60
  61         }
  62
  63
  64 void addurls(char *url) {
  65         char *up, *ptr;
  66         char buf[256];
  67         int a,b;
  68         struct urlcontent *u;
  69
  70         up = url;
  71         while (strlen(up)>0) {
  72
  73                 /* locate the = sign */
  74                 strncpy(buf,up,255);
  75                 b = (-1);
  76                 for (a=255; a>=0; --a) if (buf[a]=='=') b=a;
  77                 if (b<0) return;
  78                 buf[b]=0;
  79
  80                 u = (struct urlcontent *)malloc(sizeof(struct urlcontent));
  81                 u->next = urlstrings;
  82                 urlstrings = u;
  83                 strcpy(u->url_key, buf);
  84
  85                 /* now chop that part off */
  86                 for (a=0; a<=b; ++a) ++up;
  87
  88                 /* locate the & sign */
  89                 ptr = up;
  90                 b = strlen(up);
  91                 for (a=0; a<strlen(up); ++a) {
  92                         if (!strncmp(ptr,"&",1)) {
  93                                 b=a;
  94                                 break;
  95                                 }
  96                         ++ptr;
  97                         }
  98                 ptr = up;
  99                 for (a=0; a<b; ++a) ++ptr;
 100                 strcpy(ptr,"");
 101
 102                 u->url_data = malloc(strlen(up));
 103                 strcpy(u->url_data, up);
 104                 unescape_input(u->url_data);
 105
 106                 up = ptr;
 107                 ++up;
 108                 }
 109         }
 110
 111 void free_urls(void) {
 112         struct urlcontent *u;
 113
 114         while (urlstrings != NULL) {
 115                 free(urlstrings->url_data);
 116                 u = urlstrings->next;
 117                 free(urlstrings);
 118                 urlstrings = u;
 119                 }
 120         }
 121
 122 /*
 123  * Diagnostic function to display the contents of all variables
 124  */
 125 void dump_vars() {
 126         struct urlcontent *u;
 127
 128         for (u = urlstrings; u != NULL; u = u->next) {
 129                 fprintf(stderr, "%38s = %s\n", u->url_key, u->url_data);
 130                 }
 131         }
 132
 133 char *bstr(char *key) {
 134         struct urlcontent *u;
 135
 136         for (u = urlstrings; u != NULL; u = u->next) {
 137                 if (!strcasecmp(u->url_key, key)) return(u->url_data);
 138                 }
 139         return("");
 140         }
 141
 142
 143 void wprintf(const char *format, ...) {
 144         va_list arg_ptr;
 145         struct webcontent *wptr;
 146
 147         wptr = (struct webcontent *)malloc(sizeof(struct webcontent));
 148         wptr->next = NULL;
 149         if (wlist == NULL) {
 150                 wlist = wptr;
 151                 wlast = wptr;
 152                 }
 153         else {
 154                 wlast->next = wptr;
 155                 wlast = wptr;
 156                 }
 157
 158         va_start(arg_ptr, format);
 159         vsprintf(wptr->w_data, format, arg_ptr);
 160         va_end(arg_ptr);
 161
 162         }
 163
 164 int wContentLength(void) {
 165         struct webcontent *wptr;
 166         int len = 0;
 167
 168         for (wptr = wlist; wptr != NULL; wptr = wptr->next) {
 169                 len = len + strlen(wptr->w_data);
 170                 }
 171
 172         return(len);
 173         }
 174
 175 void wDumpContent(void) {
 176         struct webcontent *wptr;
 177
 178         printf("Content-type: text/html\n");
 179         printf("Content-length: %d\n", wContentLength());
 180         printf("\n");
 181
 182         while (wlist != NULL) {
 183                 fwrite(wlist->w_data, strlen(wlist->w_data), 1, stdout);
 184                 wptr = wlist->next;
 185                 free(wlist);
 186                 wlist = wptr;
 187                 }
 188         wlast = NULL;
 189         }
 190
 191
 192 void escputs1(char *strbuf, int nbsp)
 193 {
 194         int a;
 195
 196         for (a=0; a<strlen(strbuf); ++a) {
 197                 if (strbuf[a]=='<') wprintf("&lt;");
 198                 else if (strbuf[a]=='>') wprintf("&gt;");
 199                 else if (strbuf[a]=='&') wprintf("&amp;");
 200                 else if (strbuf[a]==34) wprintf("&quot;");
 201                 else if (strbuf[a]==LB) wprintf("<");
 202                 else if (strbuf[a]==RB) wprintf(">");
 203                 else if (strbuf[a]==QU) wprintf("\"");
 204                 else if ((strbuf[a]==32)&&(nbsp==1)) {
 205                         wprintf("&nbsp;");
 206                         }
 207                 else {
 208                         wprintf("%c", strbuf[a]);
 209                         }
 210                 }
 211         }
 212
 213 void escputs(char *strbuf)
 214 {
 215         escputs1(strbuf,0);
 216         }
 217
 218
 219
 220 char *urlesc(char *strbuf)
 221 {
 222         int a,b,c;
 223         char *ec = " #&;`'|*?-~<>^()[]{}$\\";
 224         static char outbuf[512];
 225
 226         strcpy(outbuf,"");
 227
 228         for (a=0; a<strlen(strbuf); ++a) {
 229                 c = 0;
 230                 for (b=0; b<strlen(ec); ++b) {
 231                         if (strbuf[a]==ec[b]) c=1;
 232                         }
 233                 b = strlen(outbuf);
 234                 if (c==1) sprintf(&outbuf[b],"%%%02x",strbuf[a]);
 235                 else sprintf(&outbuf[b],"%c",strbuf[a]);
 236                 }
 237         return(outbuf);
 238         }
 239
 240 void urlescputs(char *strbuf)
 241 {
 242         wprintf("%s",urlesc(strbuf));
 243         }
 244
 245
 246 /*
 247  * Look for URL's embedded in a buffer and make them linkable.  We use a
 248  * target window in order to keep the BBS session in its own window.
 249  */
 250 void url(char *buf)
 251 {
 252
 253         int pos;
 254         int start,end;
 255         char ench;
 256         char urlbuf[256];
 257         char outbuf[256];
 258
 259         start = (-1);
 260         end = strlen(buf);
 261         ench = 0;
 262
 263         for (pos=0; pos<strlen(buf); ++pos) {
 264                 if (!strncasecmp(&buf[pos],"http://",7)) start = pos;
 265                 if (!strncasecmp(&buf[pos],"ftp://",6)) start = pos;
 266                 }
 267
 268         if (start<0) return;
 269
 270         if ((start>0)&&(buf[start-1]=='<')) ench = '>';
 271         if ((start>0)&&(buf[start-1]=='[')) ench = ']';
 272         if ((start>0)&&(buf[start-1]=='(')) ench = ')';
 273         if ((start>0)&&(buf[start-1]=='{')) ench = '}';
 274
 275         for (pos=strlen(buf); pos>start; --pos) {
 276                 if ((buf[pos]==' ')||(buf[pos]==ench)) end = pos;
 277                 }
 278
 279         strncpy(urlbuf,&buf[start],end-start);
 280         urlbuf[end-start] = 0;
 281
 282
 283         strncpy(outbuf,buf,start);
 284         sprintf(&outbuf[start],"%cA HREF=%c%s%c TARGET=%c%s%c%c%s%c/A%c",
 285                 LB,QU,urlbuf,QU,QU,TARGET,QU,RB,urlbuf,LB,RB);
 286         strcat(outbuf,&buf[end]);
 287         strcpy(buf,outbuf);
 288         }
 289
 290
 291
 292
 293 void getz(char *buf) {
 294         if (fgets(buf, 256, stdin) == NULL) strcpy(buf, "");
 295         else {
 296                 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
 297                         buf[strlen(buf)-1] = 0;
 298                 }
 299         }
 300
 301 /*
 302  * Output all that important stuff that the browser will want to see
 303  */
 304 void output_headers(void) {
 305
 306         static char *unset = "; expires=28-May-1971 18:10:00 GMT";
 307
 308         printf("Server: %s\n", SERVER);
 309         printf("Connection: close\n");
 310         printf("Set-cookie: wc_session=%d\n", wc_session);
 311
 312         if (strlen(wc_host)>0) printf("Set-cookie: wc_host=%s\n", wc_host);
 313         else printf("Set-cookie: wc_host=%s\n", unset);
 314
 315         if (strlen(wc_port)>0) printf("Set-cookie: wc_port=%s\n", wc_port);
 316         else printf("Set-cookie: wc_port=%s\n", unset);
 317
 318         if (strlen(wc_username)>0) printf("Set-cookie: wc_username=%s\n",
 319                 wc_username);
 320         else printf("Set-cookie: wc_username=%s\n", unset);
 321
 322         if (strlen(wc_password)>0) printf("Set-cookie: wc_password=%s\n",
 323                 wc_password);
 324         else printf("Set-cookie: wc_password=%s\n", unset);
 325
 326         if (strlen(wc_roomname)>0) printf("Set-cookie: wc_roomname=%s\n",
 327                 wc_roomname);
 328         else printf("Set-cookie: wc_roomname=%s\n", unset);
 329         }
 330
 331 void output_static(char *what) {
 332         char buf[256];
 333         FILE *fp;
 334         struct stat statbuf;
 335         off_t bytes;
 336
 337         sprintf(buf, "static/%s", what);
 338         fp = fopen(buf, "rb");
 339         if (fp == NULL) {
 340                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 341                 output_headers();
 342                 printf("Content-Type: text/plain\n");
 343                 sprintf(buf, "%s: %s\n", what, strerror(errno));
 344                 printf("Content-length: %d\n", strlen(buf));
 345                 printf("\n");
 346                 fwrite(buf, strlen(buf), 1, stdout);
 347                 }
 348         else {
 349                 printf("HTTP/1.0 200 OK\n");
 350                 output_headers();
 351
 352                 if (!strncasecmp(&what[strlen(what)-4], ".gif", 4))
 353                         printf("Content-type: image/gif\n");
 354                 else if (!strncasecmp(&what[strlen(what)-5], ".html", 5))
 355                         printf("Content-type: text/html\n");
 356                 else
 357                         printf("Content-type: application/octet-stream\n");
 358
 359                 fstat(fileno(fp), &statbuf);
 360                 bytes = statbuf.st_size;
 361                 printf("Content-length: %ld\n", (long)bytes);
 362                 printf("\n");
 363                 while (bytes--) {
 364                         putc(getc(fp), stdout);
 365                         }
 366                 fflush(stdout);
 367                 fclose(fp);
 368                 }
 369         }
 370
 371 static const char *defaulthost = DEFAULT_HOST;
 372 static const char *defaultport = DEFAULT_PORT;
 373
 374
 375 void extract_action(char *actbuf, char *cmdbuf) {
 376         int i;
 377
 378         strcpy(actbuf, cmdbuf);
 379         if (!strncasecmp(actbuf, "GET /", 5)) strcpy(actbuf, &actbuf[5]);
 380         if (!strncasecmp(actbuf, "PUT /", 5)) strcpy(actbuf, &actbuf[5]);
 381         if (!strncasecmp(actbuf, "POST /", 6)) strcpy(actbuf, &actbuf[6]);
 382
 383         for (i=0; i<strlen(actbuf); ++i) {
 384                 if (actbuf[i]==' ') { actbuf[i]=0; i=0; }
 385                 if (actbuf[i]=='/') { actbuf[i]=0; i=0; }
 386                 if (actbuf[i]=='?') { actbuf[i]=0; i=0; }
 387                 if (actbuf[i]=='&') { actbuf[i]=0; i=0; }
 388                 }
 389         }
 390
 391
 392 void session_loop(void) {
 393         char cmd[256];
 394         char action[256];
 395         char buf[256];
 396         int a, b;
 397         int ContentLength = 0;
 398         char *content;
 399
 400         /* We stuff these with the values coming from the client cookies,
 401          * so we can use them to reconnect a timed out session if we have to.
 402          */
 403         char c_host[256];
 404         char c_port[256];
 405         char c_username[256];
 406         char c_password[256];
 407         char c_roomname[256];
 408
 409         strcpy(c_host, defaulthost);
 410         strcpy(c_port, defaultport);
 411         strcpy(c_username, "");
 412         strcpy(c_password, "");
 413         strcpy(c_roomname, "");
 414
 415         getz(cmd);
 416         extract_action(action, cmd);
 417
 418         do {
 419                 getz(buf);
 420
 421                 if (!strncasecmp(buf, "Cookie: wc_host=", 16))
 422                         strcpy(c_host, &buf[16]);
 423                 if (!strncasecmp(buf, "Cookie: wc_port=", 16))
 424                         strcpy(c_port, &buf[16]);
 425                 if (!strncasecmp(buf, "Cookie: wc_username=", 20))
 426                         strcpy(c_username, &buf[20]);
 427                 if (!strncasecmp(buf, "Cookie: wc_password=", 20))
 428                         strcpy(c_password, &buf[20]);
 429                 if (!strncasecmp(buf, "Cookie: wc_roomname=", 20))
 430                         strcpy(c_roomname, &buf[20]);
 431
 432                 if (!strncasecmp(buf, "Content-length: ", 16)) {
 433                         ContentLength = atoi(&buf[16]);
 434                         }
 435
 436                 } while(strlen(buf)>0);
 437
 438         ++TransactionCount;
 439
 440         if (ContentLength > 0) {
 441                 content = malloc(ContentLength+1);
 442                 fread(content, ContentLength, 1, stdin);
 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         /* Verbose but informative; uncomment if you want to trace variables */
 501         /* dump_vars(); */
 502
 503         if (!strcasecmp(action, "static")) {
 504                 strcpy(buf, &cmd[12]);
 505                 for (a=0; a<strlen(buf); ++a) if (isspace(buf[a])) buf[a]=0;
 506                 output_static(buf);
 507                 }
 508
 509         else if ((!logged_in)&&(!strcasecmp(action, "login"))) {
 510                 do_login();
 511                 }
 512
 513         else if (!logged_in) {
 514                 display_login();
 515                 }
 516
 517         /* Various commands... */
 518
 519         else if (!strcasecmp(action, "do_welcome")) {
 520                 do_welcome();
 521                 }
 522
 523         else if (!strcasecmp(action, "display_main_menu")) {
 524                 display_main_menu();
 525                 }
 526
 527         else if (!strcasecmp(action, "advanced")) {
 528                 display_advanced_menu();
 529                 }
 530
 531         else if (!strcasecmp(action, "whobbs")) {
 532                 whobbs();
 533                 }
 534
 535         else if (!strcasecmp(action, "knrooms")) {
 536                 list_all_rooms_by_floor();
 537                 }
 538
 539         else if (!strcasecmp(action, "gotonext")) {
 540                 slrp_highest();
 541                 gotonext();
 542                 }
 543
 544         else if (!strcasecmp(action, "skip")) {
 545                 gotonext();
 546                 }
 547
 548         else if (!strcasecmp(action, "ungoto")) {
 549                 ungoto();
 550                 }
 551
 552         else if (!strcasecmp(action, "dotgoto")) {
 553                 slrp_highest();
 554                 dotgoto();
 555                 }
 556
 557         else if (!strcasecmp(action, "termquit")) {
 558                 do_logout();
 559                 }
 560
 561         /* When all else fails... */
 562         else {
 563                 printf("HTTP/1.0 200 OK\n");
 564                 output_headers();
 565
 566                 wprintf("<HTML><HEAD><TITLE>WebCit</TITLE></HEAD><BODY>\n");
 567                 wprintf("TransactionCount is %d<HR>\n", TransactionCount);
 568                 wprintf("You're in session %d<BR>\n", wc_session);
 569                 wprintf("</BODY></HTML>\n");
 570                 wDumpContent();
 571                 }
 572
 573         fflush(stdout);
 574         if (content != NULL) {
 575                 free(content);
 576                 content = NULL;
 577                 }
 578         free_urls();
 579         }
 580
 581 int main(int argc, char *argv[]) {
 582
 583         if (argc < 2 || argc > 4) {
 584                 fprintf(stderr,
 585                         "webcit: usage: webcit <session_id> [host [port]]\n");
 586                 return 1;
 587                 }
 588
 589         wc_session = atoi(argv[1]);
 590
 591         if (argc > 2) {
 592                 defaulthost = argv[2];
 593                 if (argc > 3)
 594                         defaultport = argv[3];
 595                 }
 596
 597         strcpy(wc_host, "");
 598         strcpy(wc_port, "");
 599         strcpy(wc_username, "");
 600         strcpy(wc_password, "");
 601         strcpy(wc_roomname, "");
 602
 603         while (1) {
 604                 session_loop();
 605                 }
 606         }