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
  33 void wprintf(const char *format, ...) {
  34         va_list arg_ptr;
  35         struct webcontent *wptr;
  36
  37         wptr = (struct webcontent *)malloc(sizeof(struct webcontent));
  38         wptr->next = NULL;
  39         if (wlist == NULL) {
  40                 wlist = wptr;
  41                 wlast = wptr;
  42                 }
  43         else {
  44                 wlast->next = wptr;
  45                 wlast = wptr;
  46                 }
  47
  48         va_start(arg_ptr, format);
  49         vsprintf(wptr->w_data, format, arg_ptr);
  50         va_end(arg_ptr);
  51
  52         }
  53
  54 int wContentLength() {
  55         struct webcontent *wptr;
  56         int len = 0;
  57
  58         for (wptr = wlist; wptr != NULL; wptr = wptr->next) {
  59                 len = len + strlen(wptr->w_data);
  60                 }
  61
  62         return(len);
  63         }
  64
  65 void wDumpContent() {
  66         struct webcontent *wptr;
  67
  68         printf("Content-type: text/html\n");
  69         printf("Content-length: %d\n", wContentLength());
  70         printf("\n");
  71
  72         while (wlist != NULL) {
  73                 fwrite(wlist->w_data, strlen(wlist->w_data), 1, stdout);
  74                 wptr = wlist->next;
  75                 free(wlist);
  76                 wlist = wptr;
  77                 }
  78         wlast = NULL;
  79         }
  80
  81 void getz(char *buf) {
  82         if (fgets(buf, 256, stdin) == NULL) strcpy(buf, "");
  83         else {
  84                 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
  85                         buf[strlen(buf)-1] = 0;
  86                 }
  87         }
  88
  89 /*
  90  * Output all that important stuff that the browser will want to see
  91  */
  92 void output_headers() {
  93         printf("Server: %s\n", SERVER);
  94         printf("Connection: close\n");
  95         printf("Set-cookie: wc_session=%d\n", wc_session);
  96         if (strlen(wc_host)>0) printf("Set-cookie: wc_host=%s\n", wc_host);
  97         if (strlen(wc_port)>0) printf("Set-cookie: wc_port=%s\n", wc_port);
  98         if (strlen(wc_username)>0) printf("Set-cookie: wc_username=%s\n",
  99                 wc_username);
 100         if (strlen(wc_password)>0) printf("Set-cookie: wc_password=%s\n",
 101                 wc_password);
 102         if (strlen(wc_roomname)>0) printf("Set-cookie: wc_roomname=%s\n",
 103                 wc_roomname);
 104         }
 105
 106 void output_static(char *what) {
 107         char buf[256];
 108         FILE *fp;
 109         struct stat statbuf;
 110         off_t bytes;
 111
 112         sprintf(buf, "static/%s", what);
 113         fp = fopen(buf, "rb");
 114         if (fp == NULL) {
 115                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 116                 output_headers();
 117                 printf("Content-Type: text/plain\n");
 118                 sprintf(buf, "%s: %s\n", what, strerror(errno));
 119                 printf("Content-length: %d\n", strlen(buf));
 120                 printf("\n");
 121                 fwrite(buf, strlen(buf), 1, stdout);
 122                 }
 123         else {
 124                 printf("HTTP/1.0 200 OK\n");
 125                 output_headers();
 126
 127                 if (!strncasecmp(&what[strlen(what)-4], ".gif", 4))
 128                         printf("Content-type: image/gif\n");
 129                 else
 130                         printf("Content-type: junk/data\n");
 131
 132                 fstat(fileno(fp), &statbuf);
 133                 bytes = statbuf.st_size;
 134                 printf("Content-length: %d\n", bytes);
 135                 printf("\n");
 136                 while (bytes--) {
 137                         putc(getc(fp), stdout);
 138                         }
 139                 fclose(fp);
 140                 }
 141         }
 142
 143
 144 void session_loop() {
 145         char cmd[256];
 146         char buf[256];
 147         int a;
 148
 149         /* We stuff these with the values coming from the client cookies,
 150          * so we can use them to reconnect a timed out session if we have to.
 151          */
 152         char c_host[256];
 153         char c_port[256];
 154         char c_username[256];
 155         char c_password[256];
 156         char c_roomname[256];
 157
 158         strcpy(c_host, DEFAULT_HOST);
 159         strcpy(c_port, DEFAULT_PORT);
 160         strcpy(c_username, "");
 161         strcpy(c_password, "");
 162         strcpy(c_roomname, "");
 163
 164         getz(cmd);
 165         fprintf(stderr, "Cmd: %s\n", cmd);
 166         fflush(stderr);
 167
 168         do {
 169                 getz(buf);
 170
 171                 if (!strncasecmp(buf, "Cookie: wc_host=", 16))
 172                         strcpy(c_host, &buf[16]);
 173                 if (!strncasecmp(buf, "Cookie: wc_port=", 16))
 174                         strcpy(c_port, &buf[16]);
 175                 if (!strncasecmp(buf, "Cookie: wc_username=", 20))
 176                         strcpy(c_username, &buf[20]);
 177                 if (!strncasecmp(buf, "Cookie: wc_password=", 20))
 178                         strcpy(c_password, &buf[20]);
 179                 if (!strncasecmp(buf, "Cookie: wc_roomname=", 20))
 180                         strcpy(c_roomname, &buf[20]);
 181
 182                 } while(strlen(buf)>0);
 183
 184         ++TransactionCount;
 185
 186         /*
 187          * If we're not connected to a Citadel server, try to hook up the
 188          * connection now.  Preference is given to the host and port specified
 189          * by browser cookies, if cookies have been supplied.
 190          */
 191         if (!connected) {
 192                 serv_sock = connectsock(c_host, c_port, "tcp");
 193                 connected = 1;
 194                 strcpy(wc_host, c_host);
 195                 strcpy(wc_port, c_port);
 196                 }
 197
 198         /*
 199          * If we're not logged in, but we have username and password cookies
 200          * supplied by the browser, try using them to log in.
 201          */
 202         if ((!logged_in)&&(strlen(c_username)>0)&&(strlen(c_password)>0)) {
 203                 serv_printf("USER %s", c_username);
 204                 serv_gets(buf);
 205                 if (buf[0]=='3') {
 206                         serv_printf("PASS %s", c_password);
 207                         serv_gets(buf);
 208                         if (buf[0]=='2') {
 209                                 logged_in = 1;
 210                                 strcpy(wc_username, c_username);
 211                                 strcpy(wc_password, c_password);
 212                                 }
 213                         }
 214                 }
 215
 216         /*
 217          * If we don't have a current room, but a cookie specifying the
 218          * current room is supplied, make an effort to go there.
 219          */
 220         if ((strlen(wc_roomname)==0) && (strlen(c_roomname)>0) ) {
 221                 serv_printf("GOTO %s", c_roomname);
 222                 serv_gets(buf);
 223                 if (buf[0]=='2') {
 224                         strcpy(wc_roomname, c_roomname);
 225                         }
 226                 }
 227
 228         if (!strncasecmp(cmd, "GET /static/", 12)) {
 229                 strcpy(buf, &cmd[12]);
 230                 for (a=0; a<strlen(buf); ++a) if (isspace(buf[a])) buf[a]=0;
 231                 output_static(buf);
 232                 }
 233
 234         else if (!logged_in) {
 235                 display_login_page();
 236                 }
 237
 238         else {
 239                 printf("HTTP/1.0 200 OK\n");
 240                 output_headers();
 241
 242                 wprintf("<HTML><HEAD><TITLE>WebCit</TITLE></HEAD><BODY>\n");
 243                 wprintf("TransactionCount is %d<HR>\n", TransactionCount);
 244                 wprintf("You're in session %d<BR>\n", wc_session);
 245                 wprintf("</BODY></HTML>\n");
 246                 wDumpContent();
 247                 }
 248
 249         fflush(stdout);
 250         }
 251
 252
 253
 254 int main(int argc, char *argv[]) {
 255
 256         if (argc != 2) {
 257                 printf("%s: usage: %s <session_id>\n", argv[0], argv[0]);
 258                 exit(1);
 259                 }
 260
 261         wc_session = atoi(argv[1]);
 262         strcpy(wc_host, "");
 263         strcpy(wc_port, "");
 264         strcpy(wc_username, "");
 265         strcpy(wc_password, "");
 266         strcpy(wc_roomname, "");
 267
 268         while (1) {
 269                 session_loop();
 270                 }
 271
 272         exit(0);
 273         }