236 lines
6.7 KiB
C
236 lines
6.7 KiB
C
|
/***************************************************************************
|
||
|
|
* _ _ ____ _
|
||
|
|
* Project ___| | | | _ \| |
|
||
|
|
* / __| | | | |_) | |
|
||
|
|
* | (__| |_| | _ <| |___
|
||
|
|
* \___|\___/|_| \_\_____|
|
||
|
|
*
|
||
|
|
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
||
|
|
*
|
||
|
|
* This software is licensed as described in the file COPYING, which
|
||
|
|
* you should have received as part of this distribution. The terms
|
||
|
|
* are also available at https://curl.se/docs/copyright.html.
|
||
|
|
*
|
||
|
|
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
||
|
|
* copies of the Software, and permit persons to whom the Software is
|
||
|
|
* furnished to do so, under the terms of the COPYING file.
|
||
|
|
*
|
||
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
||
|
|
* KIND, either express or implied.
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: curl
|
||
|
|
*
|
||
|
|
***************************************************************************/
|
||
|
|
|
||
|
|
/* Escape and unescape URL encoding in strings. The functions return a new
|
||
|
|
* allocated string or NULL if an error occurred. */
|
||
|
|
|
||
|
|
#include "curl_setup.h"
|
||
|
|
|
||
|
|
#include <curl/curl.h>
|
||
|
|
|
||
|
|
#include "urldata.h"
|
||
|
|
#include "warnless.h"
|
||
|
|
#include "escape.h"
|
||
|
|
#include "strdup.h"
|
||
|
|
/* The last 3 #include files should be in this order */
|
||
|
|
#include "curl_printf.h"
|
||
|
|
#include "curl_memory.h"
|
||
|
|
#include "memdebug.h"
|
||
|
|
|
||
|
|
/* Portable character check (remember EBCDIC). Do not use isalnum() because
|
||
|
|
its behavior is altered by the current locale.
|
||
|
|
See https://datatracker.ietf.org/doc/html/rfc3986#section-2.3
|
||
|
|
*/
|
||
|
|
bool Curl_isunreserved(unsigned char in)
|
||
|
|
{
|
||
|
|
switch(in) {
|
||
|
|
case '0': case '1': case '2': case '3': case '4':
|
||
|
|
case '5': case '6': case '7': case '8': case '9':
|
||
|
|
case 'a': case 'b': case 'c': case 'd': case 'e':
|
||
|
|
case 'f': case 'g': case 'h': case 'i': case 'j':
|
||
|
|
case 'k': case 'l': case 'm': case 'n': case 'o':
|
||
|
|
case 'p': case 'q': case 'r': case 's': case 't':
|
||
|
|
case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
|
||
|
|
case 'A': case 'B': case 'C': case 'D': case 'E':
|
||
|
|
case 'F': case 'G': case 'H': case 'I': case 'J':
|
||
|
|
case 'K': case 'L': case 'M': case 'N': case 'O':
|
||
|
|
case 'P': case 'Q': case 'R': case 'S': case 'T':
|
||
|
|
case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
|
||
|
|
case '-': case '.': case '_': case '~':
|
||
|
|
return TRUE;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return FALSE;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* for ABI-compatibility with previous versions */
|
||
|
|
char *curl_escape(const char *string, int inlength)
|
||
|
|
{
|
||
|
|
return curl_easy_escape(NULL, string, inlength);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* for ABI-compatibility with previous versions */
|
||
|
|
char *curl_unescape(const char *string, int length)
|
||
|
|
{
|
||
|
|
return curl_easy_unescape(NULL, string, length, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Escapes for URL the given unescaped string of given length.
|
||
|
|
* 'data' is ignored since 7.82.0.
|
||
|
|
*/
|
||
|
|
char *curl_easy_escape(struct Curl_easy *data, const char *string,
|
||
|
|
int inlength)
|
||
|
|
{
|
||
|
|
size_t length;
|
||
|
|
struct dynbuf d;
|
||
|
|
(void)data;
|
||
|
|
|
||
|
|
if(inlength < 0)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
Curl_dyn_init(&d, CURL_MAX_INPUT_LENGTH * 3);
|
||
|
|
|
||
|
|
length = (inlength?(size_t)inlength:strlen(string));
|
||
|
|
if(!length)
|
||
|
|
return strdup("");
|
||
|
|
|
||
|
|
while(length--) {
|
||
|
|
unsigned char in = *string++; /* treat the characters unsigned */
|
||
|
|
|
||
|
|
if(Curl_isunreserved(in)) {
|
||
|
|
/* append this */
|
||
|
|
if(Curl_dyn_addn(&d, &in, 1))
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
/* encode it */
|
||
|
|
const char hex[] = "0123456789ABCDEF";
|
||
|
|
char out[3]={'%'};
|
||
|
|
out[1] = hex[in>>4];
|
||
|
|
out[2] = hex[in & 0xf];
|
||
|
|
if(Curl_dyn_addn(&d, out, 3))
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return Curl_dyn_ptr(&d);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const unsigned char hextable[] = {
|
||
|
|
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */
|
||
|
|
0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */
|
||
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */
|
||
|
|
0, 10, 11, 12, 13, 14, 15 /* 0x60 - 0x66 */
|
||
|
|
};
|
||
|
|
|
||
|
|
/* the input is a single hex digit */
|
||
|
|
#define onehex2dec(x) hextable[x - '0']
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Curl_urldecode() URL decodes the given string.
|
||
|
|
*
|
||
|
|
* Returns a pointer to a malloced string in *ostring with length given in
|
||
|
|
* *olen. If length == 0, the length is assumed to be strlen(string).
|
||
|
|
*
|
||
|
|
* ctrl options:
|
||
|
|
* - REJECT_NADA: accept everything
|
||
|
|
* - REJECT_CTRL: rejects control characters (byte codes lower than 32) in
|
||
|
|
* the data
|
||
|
|
* - REJECT_ZERO: rejects decoded zero bytes
|
||
|
|
*
|
||
|
|
* The values for the enum starts at 2, to make the assert detect legacy
|
||
|
|
* invokes that used TRUE/FALSE (0 and 1).
|
||
|
|
*/
|
||
|
|
|
||
|
|
CURLcode Curl_urldecode(const char *string, size_t length,
|
||
|
|
char **ostring, size_t *olen,
|
||
|
|
enum urlreject ctrl)
|
||
|
|
{
|
||
|
|
size_t alloc;
|
||
|
|
char *ns;
|
||
|
|
|
||
|
|
DEBUGASSERT(string);
|
||
|
|
DEBUGASSERT(ctrl >= REJECT_NADA); /* crash on TRUE/FALSE */
|
||
|
|
|
||
|
|
alloc = (length?length:strlen(string));
|
||
|
|
ns = malloc(alloc + 1);
|
||
|
|
|
||
|
|
if(!ns)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
|
||
|
|
/* store output string */
|
||
|
|
*ostring = ns;
|
||
|
|
|
||
|
|
while(alloc) {
|
||
|
|
unsigned char in = *string;
|
||
|
|
if(('%' == in) && (alloc > 2) &&
|
||
|
|
ISXDIGIT(string[1]) && ISXDIGIT(string[2])) {
|
||
|
|
/* this is two hexadecimal digits following a '%' */
|
||
|
|
in = (unsigned char)(onehex2dec(string[1]) << 4) | onehex2dec(string[2]);
|
||
|
|
|
||
|
|
string += 3;
|
||
|
|
alloc -= 3;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
string++;
|
||
|
|
alloc--;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(((ctrl == REJECT_CTRL) && (in < 0x20)) ||
|
||
|
|
((ctrl == REJECT_ZERO) && (in == 0))) {
|
||
|
|
Curl_safefree(*ostring);
|
||
|
|
return CURLE_URL_MALFORMAT;
|
||
|
|
}
|
||
|
|
|
||
|
|
*ns++ = in;
|
||
|
|
}
|
||
|
|
*ns = 0; /* terminate it */
|
||
|
|
|
||
|
|
if(olen)
|
||
|
|
/* store output size */
|
||
|
|
*olen = ns - *ostring;
|
||
|
|
|
||
|
|
return CURLE_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Unescapes the given URL escaped string of given length. Returns a
|
||
|
|
* pointer to a malloced string with length given in *olen.
|
||
|
|
* If length == 0, the length is assumed to be strlen(string).
|
||
|
|
* If olen == NULL, no output length is stored.
|
||
|
|
* 'data' is ignored since 7.82.0.
|
||
|
|
*/
|
||
|
|
char *curl_easy_unescape(struct Curl_easy *data, const char *string,
|
||
|
|
int length, int *olen)
|
||
|
|
{
|
||
|
|
char *str = NULL;
|
||
|
|
(void)data;
|
||
|
|
if(length >= 0) {
|
||
|
|
size_t inputlen = (size_t)length;
|
||
|
|
size_t outputlen;
|
||
|
|
CURLcode res = Curl_urldecode(string, inputlen, &str, &outputlen,
|
||
|
|
REJECT_NADA);
|
||
|
|
if(res)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
if(olen) {
|
||
|
|
if(outputlen <= (size_t) INT_MAX)
|
||
|
|
*olen = curlx_uztosi(outputlen);
|
||
|
|
else
|
||
|
|
/* too large to return in an int, fail! */
|
||
|
|
Curl_safefree(str);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return str;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* For operating systems/environments that use different malloc/free
|
||
|
|
systems for the app and for this library, we provide a free that uses
|
||
|
|
the library's memory system */
|
||
|
|
void curl_free(void *p)
|
||
|
|
{
|
||
|
|
free(p);
|
||
|
|
}
|