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 int wc_port;
  22 char wc_username[256];
  23 char wc_password[256];
  24 char wc_roomname[256];
  25 int TransactionCount = 0;
  26 int logged_in = 0;
  27
  28 struct webcontent *wlist = NULL;
  29 struct webcontent *wlast = NULL;
  30
  31
  32 void wprintf(const char *format, ...) {
  33         va_list arg_ptr;
  34         struct webcontent *wptr;
  35
  36         wptr = (struct webcontent *)malloc(sizeof(struct webcontent));
  37         wptr->next = NULL;
  38         if (wlist == NULL) {
  39                 wlist = wptr;
  40                 wlast = wptr;
  41                 }
  42         else {
  43                 wlast->next = wptr;
  44                 wlast = wptr;
  45                 }
  46
  47         va_start(arg_ptr, format);
  48         vsprintf(wptr->w_data, format, arg_ptr);
  49         va_end(arg_ptr);
  50
  51         }
  52
  53 int wContentLength() {
  54         struct webcontent *wptr;
  55         int len = 0;
  56
  57         for (wptr = wlist; wptr != NULL; wptr = wptr->next) {
  58                 len = len + strlen(wptr->w_data);
  59                 }
  60
  61         return(len);
  62         }
  63
  64 void wDumpContent() {
  65         struct webcontent *wptr;
  66
  67         printf("Content-type: text/html\n");
  68         printf("Content-length: %d\n", wContentLength());
  69         printf("\n");
  70
  71         while (wlist != NULL) {
  72                 fwrite(wlist->w_data, strlen(wlist->w_data), 1, stdout);
  73                 wptr = wlist->next;
  74                 free(wlist);
  75                 wlist = wptr;
  76                 }
  77         wlast = NULL;
  78         }
  79
  80 void getz(char *buf) {
  81         if (fgets(buf, 256, stdin) == NULL) strcpy(buf, "");
  82         else {
  83                 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
  84                         buf[strlen(buf)-1] = 0;
  85                 }
  86         }
  87
  88 /*
  89  * Output all that important stuff that the browser will want to see
  90  */
  91 void output_headers() {
  92         printf("Server: %s\n", SERVER);
  93         printf("Connection: close\n");
  94         printf("Set-cookie: wc_session=%d\n", wc_session);
  95         if (strlen(wc_host)>0) printf("Set-cookie: wc_host=%s\n", wc_host);
  96         if (wc_port != 0) printf("Set-cookie: wc_port=%d\n", wc_port);
  97         if (strlen(wc_username)>0) printf("Set-cookie: wc_username=%s\n",
  98                 wc_username);
  99         if (strlen(wc_password)>0) printf("Set-cookie: wc_password=%s\n",
 100                 wc_password);
 101         if (strlen(wc_roomname)>0) printf("Set-cookie: wc_roomname=%s\n",
 102                 wc_roomname);
 103         }
 104
 105 void output_static(char *what) {
 106         char buf[256];
 107         FILE *fp;
 108         struct stat statbuf;
 109         off_t bytes;
 110
 111         sprintf(buf, "static/%s", what);
 112         fp = fopen(buf, "rb");
 113         if (fp == NULL) {
 114                 printf("HTTP/1.0 404 %s\n", strerror(errno));
 115                 output_headers();
 116                 printf("Content-Type: text/plain\n");
 117                 sprintf(buf, "%s: %s\n", what, strerror(errno));
 118                 printf("Content-length: %d\n", strlen(buf));
 119                 printf("\n");
 120                 fwrite(buf, strlen(buf), 1, stdout);
 121                 }
 122         else {
 123                 printf("HTTP/1.0 200 OK\n");
 124                 output_headers();
 125
 126                 if (!strncasecmp(&what[strlen(what)-4], ".gif", 4))
 127                         printf("Content-type: image/gif\n");
 128                 else
 129                         printf("Content-type: junk/data\n");
 130
 131                 fstat(fileno(fp), &statbuf);
 132                 bytes = statbuf.st_size;
 133                 printf("Content-length: %d\n", bytes);
 134                 printf("\n");
 135                 while (bytes--) {
 136                         putc(getc(fp), stdout);
 137                         }
 138                 fclose(fp);
 139                 }
 140         }
 141
 142
 143 void session_loop() {
 144         char cmd[256];
 145         char buf[256];
 146         int a;
 147
 148         getz(cmd);
 149         fprintf(stderr, "Cmd: %s\n", cmd);
 150         fflush(stderr);
 151
 152         do {
 153                 getz(buf);
 154                 } while(strlen(buf)>0);
 155
 156         ++TransactionCount;
 157
 158         if (!strncasecmp(cmd, "GET /static/", 12)) {
 159                 strcpy(buf, &cmd[12]);
 160                 for (a=0; a<strlen(buf); ++a) if (isspace(buf[a])) buf[a]=0;
 161                 output_static(buf);
 162                 }
 163
 164         else if (!strncasecmp(cmd, "GET /demographics", 17)) {
 165                 printf("HTTP/1.0 200 OK\n");
 166                 output_headers();
 167
 168                 wprintf("<HTML><HEAD><TITLE>Stuff</TITLE></HEAD><BODY>\n");
 169                 wprintf("It's time to include an image...\n");
 170                 wprintf("<IMG SRC=\"/static/netscape.gif\">\n");
 171                 wprintf("...in the page.</BODY></HTML>\n");
 172                 wDumpContent();
 173                 }
 174
 175         else {
 176                 printf("HTTP/1.0 200 OK\n");
 177                 output_headers();
 178
 179                 wprintf("<HTML><HEAD><TITLE>WebCit</TITLE></HEAD><BODY>\n");
 180                 wprintf("TransactionCount is %d<HR>\n", TransactionCount);
 181                 wprintf("You're in session %d<BR>\n", wc_session);
 182                 wprintf("</BODY></HTML>\n");
 183                 wDumpContent();
 184                 }
 185
 186         fflush(stdout);
 187         }
 188
 189
 190
 191 int main(int argc, char *argv[]) {
 192
 193         if (argc != 2) {
 194                 printf("%s: usage: %s <session_id>\n", argv[0], argv[0]);
 195                 exit(1);
 196                 }
 197
 198         wc_session = atoi(argv[1]);
 199         strcpy(wc_host, "");
 200         wc_port = 0;
 201         strcpy(wc_username, "");
 202         strcpy(wc_password, "");
 203         strcpy(wc_roomname, "");
 204
 205         while (1) {
 206                 session_loop();
 207                 }
 208
 209         exit(0);
 210         }