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                 fprintf(stderr, "%s=%s\n", u->url_key, u->url_data);
 104                 }
 105 DONE:
 106         }
 107
 108 void free_urls() {
 109         struct urlcontent *u;
 110
 111         while (urlstrings != NULL) {
 112                 free(urlstrings->url_data);
 113                 u = urlstrings->next;
 114                 free(urlstrings);
 115                 urlstrings = u;
 116                 }
 117         }
 118
 119 char *bstr(char *key) {
 120         struct urlcontent *u;
 121
 122         for (u = urlstrings; u != NULL; u = u->next) {
 123                 if (!strcasecmp(u->url_key, key)) return(u->url_data);
 124                 }
 125         return("");
 126         }
 127
 128
 129 void wprintf(const char *format, ...) {
 130         va_list arg_ptr;
 131         struct webcontent *wptr;
 132
 133         wptr = (struct webcontent *)malloc(sizeof(struct webcontent));
 134         wptr->next = NULL;
 135         if (wlist == NULL) {
 136                 wlist = wptr;
 137                 wlast = wptr;
 138                 }
 139         else {
 140                 wlast->next = wptr;
 141                 wlast = wptr;
 142                 }
 143
 144         va_start(arg_ptr, format);
 145         vsprintf(wptr->w_data, format, arg_ptr);
 146         va_end(arg_ptr);
 147
 148         }
 149
 150 int wContentLength() {
 151         struct webcontent *wptr;
 152         int len = 0;
 153
 154         for (wptr = wlist; wptr != NULL; wptr = wptr->next) {
 155                 len = len + strlen(wptr->w_data);
 156                 }
 157
 158         return(len);
 159         }
 160
 161 void wDumpContent() {
 162         struct webcontent *wptr;
 163
 164         printf("Content-type: text/html\n");
 165         printf("Content-length: %d\n", wContentLength());
 166         printf("\n");
 167
 168         while (wlist != NULL) {
 169                 fwrite(wlist->w_data, strlen(wlist->w_data), 1, stdout);
 170                 wptr = wlist->next;
 171                 free(wlist);
 172                 wlist = wptr;
 173                 }
 174         wlast = NULL;
 175         }
 176
 177 void getz(char *buf) {
 178         if (fgets(buf, 256, stdin) == NULL) strcpy(buf, "");
 179         else {
 180                 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
 181                         buf[strlen(buf)-1] = 0;
 182                 }
 183         }
 184
 185 /*
 186  * Output all that important stuff that the browser will want to see
 187  */
 188 void output_headers() {
 189         printf("Server: %s\n", SERVER);
 190         printf("Connection: close\n");
 191         printf("Set-cookie: wc_session=%d\n", wc_session);
 192         if (strlen(wc_host)>0) printf("Set-cookie: wc_host=%s\n", wc_host);
 193         if (strlen(wc_port)>0) printf("Set-cookie: wc_port=%s\n", wc_port);
 194         if (strlen(wc_username)>0) printf("Set-cookie: wc_username=%s\n",
 195                 wc_username);
 196         if (strlen(wc_password)>0) printf("Set-cookie: wc_password=%s\n",
 197                 wc_password);
 198         if (strlen(wc_roomname)>0) printf("Set-cookie: wc_roomname=%s\n",
 199                 wc_roomname);
 200         }
 201
 202 void output_static(char *what) {
 203         char buf[256];
 204         FILE *fp;
 205         struct stat statbuf;
 206         off_t bytes;
 207
 208         sprintf(buf, "static/%s", what);
 209         fp = fopen(buf, "rb");
 210         if (fp == NULL) {
 211                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 212                 output_headers();
 213                 printf("Content-Type: text/plain\n");
 214                 sprintf(buf, "%s: %s\n", what, strerror(errno));
 215                 printf("Content-length: %d\n", strlen(buf));
 216                 printf("\n");
 217                 fwrite(buf, strlen(buf), 1, stdout);
 218                 }
 219         else {
 220                 printf("HTTP/1.0 200 OK\n");
 221                 output_headers();
 222
 223                 if (!strncasecmp(&what[strlen(what)-4], ".gif", 4))
 224                         printf("Content-type: image/gif\n");
 225                 else
 226                         printf("Content-type: application/octet-stream\n");
 227
 228                 fstat(fileno(fp), &statbuf);
 229                 bytes = statbuf.st_size;
 230                 printf("Content-length: %d\n", bytes);
 231                 printf("\n");
 232                 while (bytes--) {
 233                         putc(getc(fp), stdout);
 234                         }
 235                 fclose(fp);
 236                 }
 237         }
 238
 239
 240 void session_loop() {
 241         char cmd[256];
 242         char buf[256];
 243         int a, b;
 244         int ContentLength = 0;
 245         char *content;
 246
 247         /* We stuff these with the values coming from the client cookies,
 248          * so we can use them to reconnect a timed out session if we have to.
 249          */
 250         char c_host[256];
 251         char c_port[256];
 252         char c_username[256];
 253         char c_password[256];
 254         char c_roomname[256];
 255
 256         strcpy(c_host, DEFAULT_HOST);
 257         strcpy(c_port, DEFAULT_PORT);
 258         strcpy(c_username, "");
 259         strcpy(c_password, "");
 260         strcpy(c_roomname, "");
 261
 262         getz(cmd);
 263         fprintf(stderr, "\nCmd: %s\n", cmd);
 264         fflush(stderr);
 265
 266         do {
 267                 getz(buf);
 268                 fprintf(stderr, "Buf: %s\n", buf);
 269                 fflush(stderr);
 270
 271                 if (!strncasecmp(buf, "Cookie: wc_host=", 16))
 272                         strcpy(c_host, &buf[16]);
 273                 if (!strncasecmp(buf, "Cookie: wc_port=", 16))
 274                         strcpy(c_port, &buf[16]);
 275                 if (!strncasecmp(buf, "Cookie: wc_username=", 20))
 276                         strcpy(c_username, &buf[20]);
 277                 if (!strncasecmp(buf, "Cookie: wc_password=", 20))
 278                         strcpy(c_password, &buf[20]);
 279                 if (!strncasecmp(buf, "Cookie: wc_roomname=", 20))
 280                         strcpy(c_roomname, &buf[20]);
 281
 282                 if (!strncasecmp(buf, "Content-length: ", 16)) {
 283                         ContentLength = atoi(&buf[16]);
 284                         }
 285
 286                 } while(strlen(buf)>0);
 287
 288         ++TransactionCount;
 289
 290         if (ContentLength > 0) {
 291                 content = malloc(ContentLength+1);
 292                 fread(content, ContentLength, 1, stdin);
 293                 content[ContentLength] = 0;
 294                 fprintf(stderr, "CONTENT:\n%s\n", content);
 295                 addurls(content);
 296                 }
 297         else {
 298                 content = NULL;
 299                 }
 300
 301         /*
 302          * If we're not connected to a Citadel server, try to hook up the
 303          * connection now.  Preference is given to the host and port specified
 304          * by browser cookies, if cookies have been supplied.
 305          */
 306         if (!connected) {
 307                 serv_sock = connectsock(c_host, c_port, "tcp");
 308                 connected = 1;
 309                 serv_gets(buf); /* get the server welcome message */
 310                 strcpy(wc_host, c_host);
 311                 strcpy(wc_port, c_port);
 312                 serv_printf("IDEN %d|%d|%d|%s|%s",
 313                         DEVELOPER_ID,
 314                         CLIENT_ID,
 315                         CLIENT_VERSION,
 316                         SERVER,
 317                         ""
 318                         );
 319                 serv_gets(buf);
 320                 /* FIX find out where the user is */
 321                 }
 322
 323
 324         /*
 325          * If we're not logged in, but we have username and password cookies
 326          * supplied by the browser, try using them to log in.
 327          */
 328         if ((!logged_in)&&(strlen(c_username)>0)&&(strlen(c_password)>0)) {
 329                 serv_printf("USER %s", c_username);
 330                 serv_gets(buf);
 331                 if (buf[0]=='3') {
 332                         serv_printf("PASS %s", c_password);
 333                         serv_gets(buf);
 334                         if (buf[0]=='2') {
 335                                 logged_in = 1;
 336                                 strcpy(wc_username, c_username);
 337                                 strcpy(wc_password, c_password);
 338                                 }
 339                         }
 340                 }
 341
 342         /*
 343          * If we don't have a current room, but a cookie specifying the
 344          * current room is supplied, make an effort to go there.
 345          */
 346         if ((strlen(wc_roomname)==0) && (strlen(c_roomname)>0) ) {
 347                 serv_printf("GOTO %s", c_roomname);
 348                 serv_gets(buf);
 349                 if (buf[0]=='2') {
 350                         strcpy(wc_roomname, c_roomname);
 351                         }
 352                 }
 353
 354         /* If there are variables in the URL, we must grab them now */
 355         for (a=0; a<strlen(cmd); ++a) if (cmd[a]=='?') {
 356                 for (b=a; b<strlen(cmd); ++b) if (isspace(cmd[b])) cmd[b]=0;
 357                 addurls(&cmd[a+1]);
 358                 cmd[a] = 0;
 359                 }
 360
 361         if (!strncasecmp(cmd, "GET /static/", 12)) {
 362                 strcpy(buf, &cmd[12]);
 363                 for (a=0; a<strlen(buf); ++a) if (isspace(buf[a])) buf[a]=0;
 364                 output_static(buf);
 365                 }
 366
 367         if (!strncasecmp(cmd, "GET /nothing", 12)) {
 368                 printf("HTTP/1.0 200 OK\n");
 369                 output_headers();
 370
 371                 wprintf("<HTML><HEAD><TITLE>WebCit</TITLE></HEAD><BODY>\n");
 372                 wprintf("TransactionCount is %d<HR>\n", TransactionCount);
 373                 wprintf("You're in session %d<BR>\n", wc_session);
 374                 wprintf("</BODY></HTML>\n");
 375                 wDumpContent();
 376                 }
 377
 378         else if ((!logged_in)&&(!strncasecmp(cmd, "POST /login", 11))) {
 379                 do_login();
 380                 }
 381
 382         else if (!logged_in) {
 383                 display_login_page();
 384                 }
 385
 386         /* Various commands... */
 387
 388         /* When all else fails, display the login page. */
 389         else {
 390                 display_login_page();
 391                 }
 392
 393         fflush(stdout);
 394         if (content != NULL) {
 395                 free(content);
 396                 content = NULL;
 397                 }
 398         free_urls();
 399         }
 400
 401
 402
 403 int main(int argc, char *argv[]) {
 404
 405         if (argc != 2) {
 406                 printf("%s: usage: %s <session_id>\n", argv[0], argv[0]);
 407                 exit(1);
 408                 }
 409
 410         wc_session = atoi(argv[1]);
 411         strcpy(wc_host, "");
 412         strcpy(wc_port, "");
 413         strcpy(wc_username, "");
 414         strcpy(wc_password, "");
 415         strcpy(wc_roomname, "");
 416
 417         while (1) {
 418                 session_loop();
 419                 }
 420
 421         exit(0);
 422         }