webcit/cookie_conversion.c

   1 /*
   2  * $Id$
   3  */
   4
   5 #include "webcit.h"
   6
   7 typedef unsigned char byte;           /* Byte type used by cookie_to_stuff() */
   8
   9 /*
  10  * Pack all session info into one easy-to-digest cookie. Healthy and delicious!
  11  */
  12 void stuff_to_cookie(char *cookie, size_t clen, int session,
  13                 StrBuf *user, StrBuf *pass, StrBuf *room, const char *language)
  14 {
  15         char buf[SIZ];
  16         int i;
  17         int len;
  18
  19         len = snprintf(buf, SIZ, "%d|%s|%s|%s|%s|",
  20                 session,
  21                 ChrPtr(user),
  22                 ChrPtr(pass),
  23                 ChrPtr(room),
  24                 language
  25         );
  26
  27         strcpy(cookie, "");
  28         for (i=0; (i < len) && (i * 2 < clen); ++i) {
  29                 snprintf(&cookie[i*2], clen - i * 2, "%02X", buf[i]);
  30         }
  31 }
  32
  33 /*
  34  * Convert unpacked hex string to an integer
  35  */
  36 int xtoi(const char *in, size_t len)
  37 {
  38         int val = 0;
  39         char c = 0;
  40         while (!IsEmptyStr(in) && isxdigit((byte) *in) && (len-- > 0))
  41         {
  42                 c = *in++;
  43                 val <<= 4;
  44                 if (!isdigit((unsigned char)c)) {
  45                         c = tolower((unsigned char) c);
  46                         if ((c < 'a') || (c > 'f'))
  47                                 return 0;
  48                         val += c  - 'a' + 10 ;
  49                 }
  50                 else
  51                         val += c - '0';
  52         }
  53         return val;
  54 }
  55
  56 /*
  57  * Extract all that fun stuff out of the cookie.
  58  */
  59 void cookie_to_stuff(StrBuf *cookie,
  60                         int *session,
  61                         StrBuf *user,
  62                         StrBuf *pass,
  63                         StrBuf *room,
  64                         StrBuf *language)
  65 {
  66         if (session != NULL) {
  67                 *session = StrBufExtract_int(cookie, 0, '|');
  68         }
  69         if (user != NULL) {
  70                 StrBufExtract_token(user, cookie, 1, '|');
  71         }
  72         if (pass != NULL) {
  73                 StrBufExtract_token(pass, cookie, 2, '|');
  74         }
  75         if (room != NULL) {
  76                 StrBufExtract_token(room, cookie, 3, '|');
  77         }
  78         if (language != NULL) {
  79                 StrBufExtract_token(language, cookie, 4, '|');
  80         }
  81 }