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/*
* uclient - ustream based protocol client library
*
* Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <libubox/md5.h>
#include <libubox/utils.h>
#include "uclient-utils.h"
static const char *b64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
void base64_encode(const void *inbuf, unsigned int len, void *outbuf)
{
unsigned char *out = outbuf;
const uint8_t *in = inbuf;
unsigned int i;
int pad = len % 3;
for (i = 0; i < len - pad; i += 3) {
uint32_t in3 = (in[0] << 16) | (in[1] << 8) | in[2];
int k;
for (k = 3; k >= 0; k--) {
out[k] = b64[in3 & 0x3f];
in3 >>= 6;
}
in += 3;
out += 4;
}
if (pad) {
uint32_t in2 = in[0] << (16 - 6);
out[3] = '=';
if (pad > 1) {
in2 |= in[1] << (8 - 6);
out[2] = b64[in2 & 0x3f];
} else {
out[2] = '=';
}
in2 >>= 6;
out[1] = b64[in2 & 0x3f];
in2 >>= 6;
out[0] = b64[in2 & 0x3f];
out += 4;
}
*out = '\0';
}
int uclient_urldecode(const char *in, char *out, bool decode_plus)
{
static char dec[3];
int ret = 0;
char c;
while ((c = *(in++))) {
if (c == '%') {
if (!isxdigit(in[0]) || !isxdigit(in[1]))
return -1;
dec[0] = in[0];
dec[1] = in[1];
c = strtol(dec, NULL, 16);
in += 2;
} else if (decode_plus && c == '+') {
c = ' ';
}
*(out++) = c;
ret++;
}
*out = 0;
return ret;
}
static char hex_digit(char val)
{
val += val > 9 ? 'a' - 10 : '0';
return val;
}
void bin_to_hex(char *dest, const void *buf, int len)
{
const uint8_t *data = buf;
int i;
for (i = 0; i < len; i++) {
*(dest++) = hex_digit(data[i] >> 4);
*(dest++) = hex_digit(data[i] & 0xf);
}
*dest = 0;
}
static void http_create_hash(char *dest, const char * const * str, int n_str)
{
uint32_t hash[4];
md5_ctx_t md5;
int i;
md5_begin(&md5);
for (i = 0; i < n_str; i++) {
if (i)
md5_hash(":", 1, &md5);
md5_hash(str[i], strlen(str[i]), &md5);
}
md5_end(hash, &md5);
bin_to_hex(dest, &hash, sizeof(hash));
}
void http_digest_calculate_auth_hash(char *dest, const char *user, const char *realm, const char *password)
{
const char *hash_str[] = {
user,
realm,
password
};
http_create_hash(dest, hash_str, ARRAY_SIZE(hash_str));
}
void http_digest_calculate_response(char *dest, const struct http_digest_data *data)
{
const char *h_a2_strings[] = {
data->method,
data->uri,
};
const char *resp_strings[] = {
data->auth_hash,
data->nonce,
data->nc,
data->cnonce,
data->qop,
dest, /* initialized to H(A2) first */
};
http_create_hash(dest, h_a2_strings, ARRAY_SIZE(h_a2_strings));
http_create_hash(dest, resp_strings, ARRAY_SIZE(resp_strings));
}
char *uclient_get_url_filename(const char *url, const char *default_name)
{
const char *str;
int len = strcspn(url, ";&");
while (len > 0 && url[len - 1] == '/')
len--;
for (str = url + len - 1; str >= url; str--) {
if (*str == '/')
break;
}
str++;
len -= str - url;
if (len > 0)
return strndup(str, len);
return strdup(default_name);
}
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