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
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <ctype.h>
  13 #include <string.h>
  14 #include <errno.h>
  15 #include <sys/stat.h>
  16 #include <stdarg.h>
  17 #include "webcit.h"
  18
  19 int wc_session;
  20 char wc_host[256];
  21 char wc_port[256];
  22 char wc_username[256];
  23 char wc_password[256];
  24 char wc_roomname[256];
  25 int TransactionCount = 0;
  26 int connected = 0;
  27 int logged_in = 0;
  28
  29 struct webcontent *wlist = NULL;
  30 struct webcontent *wlast = NULL;
  31
  32 struct urlcontent *urlstrings = NULL;
  33
  34
  35 void unescape_input(buf)
  36 char buf[]; {
  37         int a,b;
  38         char hex[3];
  39
  40         while ((isspace(buf[strlen(buf)-1]))&&(strlen(buf)>0))
  41                 buf[strlen(buf)-1] = 0;
  42
  43         for (a=0; a<strlen(buf); ++a) {
  44                 if (buf[a]=='+') buf[a]=' ';
  45                 if (buf[a]=='%') {
  46                         hex[0]=buf[a+1];
  47                         hex[1]=buf[a+2];
  48                         hex[2]=0;
  49                         sscanf(hex,"%02x",&b);
  50                         buf[a] = (char) b;
  51                         strcpy(&buf[a+1],&buf[a+3]);
  52                         }
  53                 }
  54
  55         }
  56
  57
  58 void addurls(char *url) {
  59         char *up, *ptr;
  60         char buf[256];
  61         int a,b;
  62         struct urlcontent *u;
  63
  64         up = url;
  65         while (strlen(up)>0) {
  66
  67                 /* locate the = sign */
  68                 strncpy(buf,up,255);
  69                 b = (-1);
  70                 for (a=255; a>=0; --a) if (buf[a]=='=') b=a;
  71                 if (b<0) goto DONE;
  72                 buf[b]=0;
  73
  74                 u = (struct urlcontent *)malloc(sizeof(struct urlcontent));
  75                 u->next = urlstrings;
  76                 urlstrings = u;
  77                 strcpy(u->url_key, buf);
  78
  79                 /* now chop that part off */
  80                 for (a=0; a<=b; ++a) ++up;
  81
  82                 /* locate the & sign */
  83                 ptr = up;
  84                 b = strlen(up);
  85                 for (a=0; a<strlen(up); ++a) {
  86                         if (!strncmp(ptr,"&",1)) {
  87                                 b=a;
  88                                 goto FOUNDIT;
  89                                 }
  90                         ++ptr;
  91                         }
  92 FOUNDIT:        ptr = up;
  93                 for (a=0; a<b; ++a) ++ptr;
  94                 strcpy(ptr,"");
  95
  96                 u->url_data = malloc(strlen(up));
  97                 strcpy(u->url_data, up);
  98                 unescape_input(u->url_data);
  99
 100                 up = ptr;
 101                 ++up;
 102                 }
 103 DONE:
 104         }
 105
 106 void free_urls() {
 107         struct urlcontent *u;
 108
 109         while (urlstrings != NULL) {
 110                 free(urlstrings->url_data);
 111                 u = urlstrings->next;
 112                 free(urlstrings);
 113                 urlstrings = u;
 114                 }
 115         }
 116
 117 char *bstr(char *key) {
 118         struct urlcontent *u;
 119
 120         for (u = urlstrings; u != NULL; u = u->next) {
 121                 if (!strcasecmp(u->url_key, key)) return(u->url_data);
 122                 }
 123         return("");
 124         }
 125
 126
 127 void wprintf(const char *format, ...) {
 128         va_list arg_ptr;
 129         struct webcontent *wptr;
 130
 131         wptr = (struct webcontent *)malloc(sizeof(struct webcontent));
 132         wptr->next = NULL;
 133         if (wlist == NULL) {
 134                 wlist = wptr;
 135                 wlast = wptr;
 136                 }
 137         else {
 138                 wlast->next = wptr;
 139                 wlast = wptr;
 140                 }
 141
 142         va_start(arg_ptr, format);
 143         vsprintf(wptr->w_data, format, arg_ptr);
 144         va_end(arg_ptr);
 145
 146         }
 147
 148 int wContentLength() {
 149         struct webcontent *wptr;
 150         int len = 0;
 151
 152         for (wptr = wlist; wptr != NULL; wptr = wptr->next) {
 153                 len = len + strlen(wptr->w_data);
 154                 }
 155
 156         return(len);
 157         }
 158
 159 void wDumpContent() {
 160         struct webcontent *wptr;
 161
 162         printf("Content-type: text/html\n");
 163         printf("Content-length: %d\n", wContentLength());
 164         printf("\n");
 165
 166         while (wlist != NULL) {
 167                 fwrite(wlist->w_data, strlen(wlist->w_data), 1, stdout);
 168                 wptr = wlist->next;
 169                 free(wlist);
 170                 wlist = wptr;
 171                 }
 172         wlast = NULL;
 173         }
 174
 175
 176 void escputs1(strbuf,nbsp)
 177 char strbuf[];
 178 int nbsp; {
 179         int a;
 180
 181         for (a=0; a<strlen(strbuf); ++a) {
 182                 if (strbuf[a]=='<') wprintf("&lt;");
 183                 else if (strbuf[a]=='>') wprintf("&gt;");
 184                 else if (strbuf[a]=='&') wprintf("&amp;");
 185                 else if (strbuf[a]==34) wprintf("&quot;");
 186                 else if (strbuf[a]==LB) wprintf("<");
 187                 else if (strbuf[a]==RB) wprintf(">");
 188                 else if (strbuf[a]==QU) wprintf("\"");
 189                 else if ((strbuf[a]==32)&&(nbsp==1)) {
 190                         wprintf("&nbsp;");
 191                         }
 192                 else {
 193                         wprintf("%c", strbuf[a]);
 194                         }
 195                 }
 196         }
 197
 198 void escputs(strbuf)
 199 char *strbuf; {
 200         escputs1(strbuf,0);
 201         }
 202
 203
 204
 205 char *urlesc(strbuf)
 206 char strbuf[]; {
 207         int a,b,c;
 208         char *ec = " #&;`'|*?-~<>^()[]{}$\\";
 209         static char outbuf[512];
 210
 211         strcpy(outbuf,"");
 212
 213         for (a=0; a<strlen(strbuf); ++a) {
 214                 c = 0;
 215                 for (b=0; b<strlen(ec); ++b) {
 216                         if (strbuf[a]==ec[b]) c=1;
 217                         }
 218                 b = strlen(outbuf);
 219                 if (c==1) sprintf(&outbuf[b],"%%%02x",strbuf[a]);
 220                 else sprintf(&outbuf[b],"%c",strbuf[a]);
 221                 }
 222         return(outbuf);
 223         }
 224
 225 void urlescputs(strbuf)
 226 char strbuf[]; {
 227         wprintf("%s",urlesc(strbuf));
 228         }
 229
 230
 231 /*
 232  * Look for URL's embedded in a buffer and make them linkable.  We use a
 233  * target window in order to keep the BBS session in its own window.
 234  */
 235 void url(buf)
 236 char buf[]; {
 237
 238         int pos;
 239         int start,end;
 240         char ench;
 241         char urlbuf[256];
 242         char outbuf[256];
 243
 244         start = (-1);
 245         end = strlen(buf);
 246         ench = 0;
 247
 248         for (pos=0; pos<strlen(buf); ++pos) {
 249                 if (!strncasecmp(&buf[pos],"http://",7)) start = pos;
 250                 if (!strncasecmp(&buf[pos],"ftp://",6)) start = pos;
 251                 }
 252
 253         if (start<0) return;
 254
 255         if ((start>0)&&(buf[start-1]=='<')) ench = '>';
 256         if ((start>0)&&(buf[start-1]=='[')) ench = ']';
 257         if ((start>0)&&(buf[start-1]=='(')) ench = ')';
 258         if ((start>0)&&(buf[start-1]=='{')) ench = '}';
 259
 260         for (pos=strlen(buf); pos>start; --pos) {
 261                 if ((buf[pos]==' ')||(buf[pos]==ench)) end = pos;
 262                 }
 263
 264         strncpy(urlbuf,&buf[start],end-start);
 265         urlbuf[end-start] = 0;
 266
 267
 268         strncpy(outbuf,buf,start);
 269         sprintf(&outbuf[start],"%cA HREF=%c%s%c TARGET=%c%s%c%c%s%c/A%c",
 270                 LB,QU,urlbuf,QU,QU,TARGET,QU,RB,urlbuf,LB,RB);
 271         strcat(outbuf,&buf[end]);
 272         strcpy(buf,outbuf);
 273         }
 274
 275
 276
 277
 278 void getz(char *buf) {
 279         if (fgets(buf, 256, stdin) == NULL) strcpy(buf, "");
 280         else {
 281                 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
 282                         buf[strlen(buf)-1] = 0;
 283                 }
 284         }
 285
 286 /*
 287  * Output all that important stuff that the browser will want to see
 288  */
 289 void output_headers() {
 290         printf("Server: %s\n", SERVER);
 291         printf("Connection: close\n");
 292         printf("Set-cookie: wc_session=%d\n", wc_session);
 293         if (strlen(wc_host)>0) printf("Set-cookie: wc_host=%s\n", wc_host);
 294         if (strlen(wc_port)>0) printf("Set-cookie: wc_port=%s\n", wc_port);
 295         if (strlen(wc_username)>0) printf("Set-cookie: wc_username=%s\n",
 296                 wc_username);
 297         if (strlen(wc_password)>0) printf("Set-cookie: wc_password=%s\n",
 298                 wc_password);
 299         if (strlen(wc_roomname)>0) printf("Set-cookie: wc_roomname=%s\n",
 300                 wc_roomname);
 301         }
 302
 303 void output_static(char *what) {
 304         char buf[256];
 305         FILE *fp;
 306         struct stat statbuf;
 307         off_t bytes;
 308
 309         sprintf(buf, "static/%s", what);
 310         fp = fopen(buf, "rb");
 311         if (fp == NULL) {
 312                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 313                 output_headers();
 314                 printf("Content-Type: text/plain\n");
 315                 sprintf(buf, "%s: %s\n", what, strerror(errno));
 316                 printf("Content-length: %d\n", strlen(buf));
 317                 printf("\n");
 318                 fwrite(buf, strlen(buf), 1, stdout);
 319                 }
 320         else {
 321                 printf("HTTP/1.0 200 OK\n");
 322                 output_headers();
 323
 324                 if (!strncasecmp(&what[strlen(what)-4], ".gif", 4))
 325                         printf("Content-type: image/gif\n");
 326                 else if (!strncasecmp(&what[strlen(what)-5], ".html", 5))
 327                         printf("Content-type: text/html\n");
 328                 else
 329                         printf("Content-type: application/octet-stream\n");
 330
 331                 fstat(fileno(fp), &statbuf);
 332                 bytes = statbuf.st_size;
 333                 printf("Content-length: %d\n", bytes);
 334                 printf("\n");
 335                 while (bytes--) {
 336                         putc(getc(fp), stdout);
 337                         }
 338                 fclose(fp);
 339                 }
 340         }
 341
 342
 343 void session_loop() {
 344         char cmd[256];
 345         char buf[256];
 346         int a, b;
 347         int ContentLength = 0;
 348         char *content;
 349
 350         /* We stuff these with the values coming from the client cookies,
 351          * so we can use them to reconnect a timed out session if we have to.
 352          */
 353         char c_host[256];
 354         char c_port[256];
 355         char c_username[256];
 356         char c_password[256];
 357         char c_roomname[256];
 358
 359         strcpy(c_host, DEFAULT_HOST);
 360         strcpy(c_port, DEFAULT_PORT);
 361         strcpy(c_username, "");
 362         strcpy(c_password, "");
 363         strcpy(c_roomname, "");
 364
 365         getz(cmd);
 366
 367         do {
 368                 getz(buf);
 369
 370                 if (!strncasecmp(buf, "Cookie: wc_host=", 16))
 371                         strcpy(c_host, &buf[16]);
 372                 if (!strncasecmp(buf, "Cookie: wc_port=", 16))
 373                         strcpy(c_port, &buf[16]);
 374                 if (!strncasecmp(buf, "Cookie: wc_username=", 20))
 375                         strcpy(c_username, &buf[20]);
 376                 if (!strncasecmp(buf, "Cookie: wc_password=", 20))
 377                         strcpy(c_password, &buf[20]);
 378                 if (!strncasecmp(buf, "Cookie: wc_roomname=", 20))
 379                         strcpy(c_roomname, &buf[20]);
 380
 381                 if (!strncasecmp(buf, "Content-length: ", 16)) {
 382                         ContentLength = atoi(&buf[16]);
 383                         }
 384
 385                 } while(strlen(buf)>0);
 386
 387         ++TransactionCount;
 388
 389         if (ContentLength > 0) {
 390                 content = malloc(ContentLength+1);
 391                 fread(content, ContentLength, 1, stdin);
 392                 content[ContentLength] = 0;
 393                 addurls(content);
 394                 }
 395         else {
 396                 content = NULL;
 397                 }
 398
 399         /*
 400          * If we're not connected to a Citadel server, try to hook up the
 401          * connection now.  Preference is given to the host and port specified
 402          * by browser cookies, if cookies have been supplied.
 403          */
 404         if (!connected) {
 405                 serv_sock = connectsock(c_host, c_port, "tcp");
 406                 connected = 1;
 407                 serv_gets(buf); /* get the server welcome message */
 408                 strcpy(wc_host, c_host);
 409                 strcpy(wc_port, c_port);
 410                 get_serv_info();
 411                 }
 412
 413
 414         /*
 415          * If we're not logged in, but we have username and password cookies
 416          * supplied by the browser, try using them to log in.
 417          */
 418         if ((!logged_in)&&(strlen(c_username)>0)&&(strlen(c_password)>0)) {
 419                 serv_printf("USER %s", c_username);
 420                 serv_gets(buf);
 421                 if (buf[0]=='3') {
 422                         serv_printf("PASS %s", c_password);
 423                         serv_gets(buf);
 424                         if (buf[0]=='2') {
 425                                 become_logged_in(c_username, c_password, buf);
 426                                 }
 427                         }
 428                 }
 429
 430         /*
 431          * If we don't have a current room, but a cookie specifying the
 432          * current room is supplied, make an effort to go there.
 433          */
 434         if ((strlen(wc_roomname)==0) && (strlen(c_roomname)>0) ) {
 435                 serv_printf("GOTO %s", c_roomname);
 436                 serv_gets(buf);
 437                 if (buf[0]=='2') {
 438                         strcpy(wc_roomname, c_roomname);
 439                         }
 440                 }
 441
 442         /* If there are variables in the URL, we must grab them now */
 443         for (a=0; a<strlen(cmd); ++a) if (cmd[a]=='?') {
 444                 for (b=a; b<strlen(cmd); ++b) if (isspace(cmd[b])) cmd[b]=0;
 445                 addurls(&cmd[a+1]);
 446                 cmd[a] = 0;
 447                 }
 448
 449         if (!strncasecmp(cmd, "GET /static/", 12)) {
 450                 strcpy(buf, &cmd[12]);
 451                 for (a=0; a<strlen(buf); ++a) if (isspace(buf[a])) buf[a]=0;
 452                 output_static(buf);
 453                 }
 454
 455
 456         else if ((!logged_in)&&(!strncasecmp(cmd, "POST /login", 11))) {
 457                 do_login();
 458                 }
 459
 460         else if (!logged_in) {
 461                 display_login_page();
 462                 }
 463
 464         /* Various commands... */
 465
 466         else if (!strncasecmp(cmd, "GET /display_main_menu", 22)) {
 467                 display_main_menu();
 468                 }
 469
 470         else if (!strncasecmp(cmd, "GET /whobbs", 11)) {
 471                 whobbs();
 472                 }
 473
 474         else if (!strncasecmp(cmd, "GET /knrooms", 12)) {
 475                 list_all_rooms_by_floor();
 476                 }
 477
 478         else if (!strncasecmp(cmd, "GET /test", 9)) {
 479                 printf("HTTP/1.0 200 OK\n");
 480                 output_headers();
 481
 482                 wprintf("<HTML><HEAD><TITLE>WebCit</TITLE></HEAD><BODY>\n");
 483                 wprintf("TransactionCount is %d<HR>\n", TransactionCount);
 484                 wprintf("You're in session %d<BR>\n", wc_session);
 485                 wprintf("</BODY></HTML>\n");
 486                 wDumpContent();
 487                 }
 488
 489         /* When all else fails... */
 490         else {
 491                 printf("HTTP/1.0 200 OK\n");
 492                 output_headers();
 493
 494                 wprintf("<HTML><HEAD><TITLE>WebCit</TITLE></HEAD><BODY>\n");
 495                 wprintf("TransactionCount is %d<HR>\n", TransactionCount);
 496                 wprintf("You're in session %d<BR>\n", wc_session);
 497                 wprintf("</BODY></HTML>\n");
 498                 wDumpContent();
 499                 }
 500
 501         fflush(stdout);
 502         if (content != NULL) {
 503                 free(content);
 504                 content = NULL;
 505                 }
 506         free_urls();
 507         }
 508
 509
 510
 511 int main(int argc, char *argv[]) {
 512
 513         if (argc != 2) {
 514                 printf("%s: usage: %s <session_id>\n", argv[0], argv[0]);
 515                 exit(1);
 516                 }
 517
 518         wc_session = atoi(argv[1]);
 519         strcpy(wc_host, "");
 520         strcpy(wc_port, "");
 521         strcpy(wc_username, "");
 522         strcpy(wc_password, "");
 523         strcpy(wc_roomname, "");
 524
 525         while (1) {
 526                 session_loop();
 527                 }
 528
 529         exit(0);
 530         }