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/*
* uhttpd - Tiny single-threaded httpd
*
* Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
* Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <ctype.h>
#include "uhttpd.h"
bool uh_use_chunked(struct client *cl)
{
if (cl->request.version != UH_HTTP_VER_1_1)
return false;
if (cl->request.method == UH_HTTP_MSG_HEAD)
return false;
return true;
}
void uh_chunk_write(struct client *cl, const void *data, int len)
{
bool chunked = uh_use_chunked(cl);
uloop_timeout_set(&cl->timeout, conf.network_timeout * 1000);
if (chunked)
ustream_printf(cl->us, "%X\r\n", len);
ustream_write(cl->us, data, len, true);
if (chunked)
ustream_printf(cl->us, "\r\n", len);
}
void uh_chunk_vprintf(struct client *cl, const char *format, va_list arg)
{
char buf[256];
va_list arg2;
int len;
uloop_timeout_set(&cl->timeout, conf.network_timeout * 1000);
if (!uh_use_chunked(cl)) {
ustream_vprintf(cl->us, format, arg);
return;
}
va_copy(arg2, arg);
len = vsnprintf(buf, sizeof(buf), format, arg2);
va_end(arg2);
ustream_printf(cl->us, "%X\r\n", len);
if (len < sizeof(buf))
ustream_write(cl->us, buf, len, true);
else
ustream_vprintf(cl->us, format, arg);
ustream_printf(cl->us, "\r\n", len);
}
void uh_chunk_printf(struct client *cl, const char *format, ...)
{
va_list arg;
va_start(arg, format);
uh_chunk_vprintf(cl, format, arg);
va_end(arg);
}
void uh_chunk_eof(struct client *cl)
{
if (!uh_use_chunked(cl))
return;
ustream_printf(cl->us, "0\r\n\r\n");
}
/* blen is the size of buf; slen is the length of src. The input-string need
** not be, and the output string will not be, null-terminated. Returns the
** length of the decoded string, -1 on buffer overflow, -2 on malformed string. */
int uh_urldecode(char *buf, int blen, const char *src, int slen)
{
int i;
int len = 0;
#define hex(x) \
(((x) <= '9') ? ((x) - '0') : \
(((x) <= 'F') ? ((x) - 'A' + 10) : \
((x) - 'a' + 10)))
for (i = 0; (i < slen) && (len < blen); i++)
{
if (src[i] != '%') {
buf[len++] = src[i];
continue;
}
if (i + 2 >= slen || !isxdigit(src[i + 1]) || !isxdigit(src[i + 2]))
return -2;
buf[len++] = (char)(16 * hex(src[i+1]) + hex(src[i+2]));
i += 2;
}
buf[len] = 0;
return (i == slen) ? len : -1;
}
/* blen is the size of buf; slen is the length of src. The input-string need
** not be, and the output string will not be, null-terminated. Returns the
** length of the encoded string, or -1 on error (buffer overflow) */
int uh_urlencode(char *buf, int blen, const char *src, int slen)
{
int i;
int len = 0;
const char hex[] = "0123456789abcdef";
for (i = 0; (i < slen) && (len < blen); i++)
{
if( isalnum(src[i]) || (src[i] == '-') || (src[i] == '_') ||
(src[i] == '.') || (src[i] == '~') )
{
buf[len++] = src[i];
}
else if ((len+3) <= blen)
{
buf[len++] = '%';
buf[len++] = hex[(src[i] >> 4) & 15];
buf[len++] = hex[ src[i] & 15];
}
else
{
len = -1;
break;
}
}
return (i == slen) ? len : -1;
}
int uh_b64decode(char *buf, int blen, const unsigned char *src, int slen)
{
unsigned int cout = 0;
unsigned int cin = 0;
int len = 0;
int i = 0;
for (i = 0; (i <= slen) && (src[i] != 0); i++)
{
cin = src[i];
if ((cin >= '0') && (cin <= '9'))
cin = cin - '0' + 52;
else if ((cin >= 'A') && (cin <= 'Z'))
cin = cin - 'A';
else if ((cin >= 'a') && (cin <= 'z'))
cin = cin - 'a' + 26;
else if (cin == '+')
cin = 62;
else if (cin == '/')
cin = 63;
else if (cin == '=')
cin = 0;
else
continue;
cout = (cout << 6) | cin;
if ((i % 4) != 3)
continue;
if ((len + 3) >= blen)
break;
buf[len++] = (char)(cout >> 16);
buf[len++] = (char)(cout >> 8);
buf[len++] = (char)(cout);
}
buf[len++] = 0;
return len;
}
bool uh_path_match(const char *prefix, const char *url)
{
int len = strlen(prefix);
if (strncmp(url, prefix, len) != 0)
return false;
return url[len] == '/' || url[len] == 0;
}
char *uh_split_header(char *str)
{
char *val;
val = strchr(str, ':');
if (!val)
return NULL;
*val = 0;
val++;
while (isspace(*val))
val++;
return val;
}
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