webcit/cookie_conversion.c

   1 /*
   2  * $Id$
   3  */
   4 /**
   5  * \defgroup CookieConversion Grep Cookies
   6  * Utility functions which convert the HTTP cookie format we use to and
   7  * from user/password/room strings.
   8  *
   9  * \ingroup WebcitHttpServer
  10  */
  11 /*@{*/
  12 #include "webcit.h"
  13
  14
  15 #define TRUE  1    /**< for sure? */
  16 #define FALSE 0    /**< nope. */
  17
  18 typedef unsigned char byte;           /**< Byte type */
  19
  20 /**
  21  * \brief find cookie
  22  * Pack all session info into one easy-to-digest cookie. Healthy and delicious!
  23  * \param cookie cookie string to create???
  24  * \param session the session we want to convert into a cookie
  25  * \param user the user to be associated with the cookie
  26  * \param pass his passphrase
  27  * \param room the room he wants to enter
  28  */
  29 void stuff_to_cookie(char *cookie, size_t clen, int session,
  30                 StrBuf *user, StrBuf *pass, StrBuf *room)
  31 {
  32         char buf[SIZ];
  33         int i;
  34         int len;
  35
  36         len = snprintf(buf, SIZ, "%d|%s|%s|%s|",
  37                        session,
  38                        ChrPtr(user),
  39                        ChrPtr(pass),
  40                        ChrPtr(room));
  41
  42         strcpy(cookie, "");
  43         for (i=0; (i < len) && (i * 2 < clen); ++i) {
  44                 snprintf(&cookie[i*2], clen - i * 2, "%02X", buf[i]);
  45         }
  46 }
  47
  48 /**
  49  * \brief       Convert unpacked hex string to an integer
  50  * \param       in      Input hex string
  51  * \param       len     the length of the string
  52  * \return      the corrosponding integer value
  53  */
  54 int xtoi(const char *in, size_t len)
  55 {
  56         int val = 0;
  57         char c = 0;
  58         while (!IsEmptyStr(in) && isxdigit((byte) *in) && (len-- > 0))
  59         {
  60                 c = *in++;
  61                 val <<= 4;
  62                 if (!isdigit((unsigned char)c)) {
  63                         c = tolower((unsigned char) c);
  64                         if ((c < 'a') || (c > 'f'))
  65                                 return 0;
  66                         val += c  - 'a' + 10 ;
  67                 }
  68                 else
  69                         val += c - '0';
  70         }
  71         return val;
  72 }
  73
  74 /**
  75  * \brief Extract all that fun stuff out of the cookie.
  76  * \param cookie the cookie string
  77  * \param session the corrosponding session to return
  78  * \param user the user string
  79  * \param user_len the user stringlength
  80  * \param pass the passphrase
  81  * \param pass_len length of the passphrase string
  82  * \param room the room he is in
  83  * \param room_len the length of the room string
  84  */
  85 void cookie_to_stuff(StrBuf *cookie, int *session,
  86                      StrBuf *user,
  87                      StrBuf *pass,
  88                      StrBuf *room)
  89 {
  90         const char *pch;
  91         char buf[SIZ];
  92         StrBuf *Buf;
  93         int i, len;
  94
  95         pch = strstr(ChrPtr(cookie), "webcit=");
  96
  97         if (pch != NULL)
  98                 StrBufCutLeft(cookie, (pch - ChrPtr(cookie)) + 7);
  99
 100         strcpy(buf, "");
 101         len = StrLength(cookie) / 2;
 102         pch = ChrPtr(cookie);
 103         for (i=0; i<len; ++i) {
 104                 buf[i] = xtoi(&pch[i*2], 2);
 105                 buf[i+1] = 0;
 106         }
 107         Buf = NewStrBufPlain(buf, i);
 108
 109 /* debug
 110         char t[256];
 111         extract_token(t, buf, 0, '|', sizeof t);
 112         lprintf(9, "SESS: %s\n", t);
 113         extract_token(t, buf, 1, '|', sizeof t);
 114         lprintf(9, "USER: %s\n", t);
 115         extract_token(t, buf, 2, '|', sizeof t);
 116         lprintf(9, "PASS: %s\n", t);
 117         extract_token(t, buf, 3, '|', sizeof t);
 118         lprintf(9, "ROOM: %s\n", t);
 119  debug */
 120
 121         if (session != NULL)
 122                 *session = StrBufExtract_int(Buf, 0, '|');
 123         if (user != NULL)
 124                 StrBufExtract_token(user, Buf, 1, '|');
 125         if (pass != NULL)
 126                 StrBufExtract_token(pass, Buf, 2, '|');
 127         if (room != NULL)
 128                 StrBufExtract_token(room, Buf, 3, '|');
 129         FreeStrBuf(&Buf);
 130 }
 131 /*@}*/