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/*
* mpg321 - a fully free clone of mpg123.
* Proxy Server Authentication Mechanism
* Copyright (C) 2006 Nanakos Chrysostomos <nanakos@wired-net.gr>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
/* base64 encoding... */
static const char base64digits[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
#define ERRB -1
static const char base64val[] = {
ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,
ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,ERRB,
ERRB,ERRB,ERRB,ERRB, ERRB,ERRB,ERRB,ERRB, ERRB,ERRB,ERRB, 62, ERRB,ERRB,ERRB, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,ERRB,ERRB, ERRB,ERRB,ERRB,ERRB,
ERRB, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,ERRB, ERRB,ERRB,ERRB,ERRB,
ERRB, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,ERRB, ERRB,ERRB,ERRB,ERRB
};
#define DECODE64(c) (isascii(c) ? base64val[c] : ERRB)
unsigned char authstring[80];
extern char *basic_auth;
extern int auth_enable;
extern int auth_enable_var;
void do_base64(unsigned char *out, const unsigned char *in, int len)
{
while (len >= 3) {
*out++ = base64digits[in[0] >> 2];
*out++ = base64digits[((in[0] << 4) & 0x30) | (in[1] >> 4)];
*out++ = base64digits[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
*out++ = base64digits[in[2] & 0x3f];
len -= 3;
in += 3;
}
/* clean up remainder */
if (len > 0) {
unsigned char fragment;
*out++ = base64digits[in[0] >> 2];
fragment = (in[0] << 4) & 0x30;
if (len > 1)
fragment |= in[1] >> 4;
*out++ = base64digits[fragment];
*out++ = (len < 2) ? '=' : base64digits[(in[1] << 2) & 0x3c];
*out++ = '=';
}
*out = '\0';
}
void do_basicauth()
{
char user_arg[16],pass_arg[16],*t,*p=NULL;
char *user_arg_var,*pass_arg_var;
int len;
t=strchr(basic_auth,':');
sscanf(t,":%s",(char *)&pass_arg);
snprintf(user_arg,(int)(t-basic_auth)+1,"%s",basic_auth);
if(auth_enable && !auth_enable_var)
{
len=strlen(user_arg)+strlen(pass_arg)+2;
p=(char *)malloc(len);
sprintf(p,"%s:%s",user_arg,pass_arg);
}else if(!auth_enable && auth_enable_var)
{
user_arg_var = getenv(user_arg);
pass_arg_var = getenv(pass_arg);
len=strlen(user_arg_var)+strlen(pass_arg_var)+2;
p=(char *)malloc(len);
sprintf(p,"%s:%s",user_arg_var,pass_arg_var);
}
do_base64(authstring,(unsigned char *)p,strlen(p));
free(p);
}
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