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esp-idf/examples/common_components/protocol_examples_common/protocol_examples_utils.c
Laukik Hase 167618d6a4 examples/protocols: Added URI encoding/decoding feature 
- http_server/simple: Decoding received query
  - esp_http_client: Sending encoded query
2023-01-25 17:47:14 +05:30

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/*
* Utility functions for protocol examples
*
* SPDX-FileCopyrightText: 2002-2021 Igor Sysoev
* 2011-2022 Nginx, Inc.
*
* SPDX-License-Identifier: BSD-2-Clause
*
* SPDX-FileContributor: 2023 Espressif Systems (Shanghai) CO LTD
*/
/*
* Copyright (C) 2002-2021 Igor Sysoev
* Copyright (C) 2011-2022 Nginx, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "protocol_examples_utils.h"
/* Type of Escape algorithms to be used */
#define NGX_ESCAPE_URI (0)
#define NGX_ESCAPE_ARGS (1)
#define NGX_ESCAPE_URI_COMPONENT (2)
#define NGX_ESCAPE_HTML (3)
#define NGX_ESCAPE_REFRESH (4)
#define NGX_ESCAPE_MEMCACHED (5)
#define NGX_ESCAPE_MAIL_AUTH (6)
/* Type of Unescape algorithms to be used */
#define NGX_UNESCAPE_URI (1)
#define NGX_UNESCAPE_REDIRECT (2)
uintptr_t ngx_escape_uri(u_char *dst, u_char *src, size_t size, unsigned int type)
{
unsigned int n;
uint32_t *escape;
static u_char hex[] = "0123456789ABCDEF";
/*
* Per RFC 3986 only the following chars are allowed in URIs unescaped:
*
* unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
* gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"
* sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
* / "*" / "+" / "," / ";" / "="
*
* And "%" can appear as a part of escaping itself. The following
* characters are not allowed and need to be escaped: %00-%1F, %7F-%FF,
* " ", """, "<", ">", "\", "^", "`", "{", "|", "}".
*/
/* " ", "#", "%", "?", not allowed */
static uint32_t uri[] = {
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
/* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */
0xd000002d, /* 1101 0000 0000 0000 0000 0000 0010 1101 */
/* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */
0x50000000, /* 0101 0000 0000 0000 0000 0000 0000 0000 */
/* ~}| {zyx wvut srqp onml kjih gfed cba` */
0xb8000001, /* 1011 1000 0000 0000 0000 0000 0000 0001 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff /* 1111 1111 1111 1111 1111 1111 1111 1111 */
};
/* " ", "#", "%", "&", "+", ";", "?", not allowed */
static uint32_t args[] = {
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
/* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */
0xd800086d, /* 1101 1000 0000 0000 0000 1000 0110 1101 */
/* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */
0x50000000, /* 0101 0000 0000 0000 0000 0000 0000 0000 */
/* ~}| {zyx wvut srqp onml kjih gfed cba` */
0xb8000001, /* 1011 1000 0000 0000 0000 0000 0000 0001 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff /* 1111 1111 1111 1111 1111 1111 1111 1111 */
};
/* not ALPHA, DIGIT, "-", ".", "_", "~" */
static uint32_t uri_component[] = {
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
/* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */
0xfc009fff, /* 1111 1100 0000 0000 1001 1111 1111 1111 */
/* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */
0x78000001, /* 0111 1000 0000 0000 0000 0000 0000 0001 */
/* ~}| {zyx wvut srqp onml kjih gfed cba` */
0xb8000001, /* 1011 1000 0000 0000 0000 0000 0000 0001 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff /* 1111 1111 1111 1111 1111 1111 1111 1111 */
};
/* " ", "#", """, "%", "'", not allowed */
static uint32_t html[] = {
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
/* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */
0x500000ad, /* 0101 0000 0000 0000 0000 0000 1010 1101 */
/* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */
0x50000000, /* 0101 0000 0000 0000 0000 0000 0000 0000 */
/* ~}| {zyx wvut srqp onml kjih gfed cba` */
0xb8000001, /* 1011 1000 0000 0000 0000 0000 0000 0001 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff /* 1111 1111 1111 1111 1111 1111 1111 1111 */
};
/* " ", """, "'", not allowed */
static uint32_t refresh[] = {
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
/* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */
0x50000085, /* 0101 0000 0000 0000 0000 0000 1000 0101 */
/* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */
0x50000000, /* 0101 0000 0000 0000 0000 0000 0000 0000 */
/* ~}| {zyx wvut srqp onml kjih gfed cba` */
0xd8000001, /* 1011 1000 0000 0000 0000 0000 0000 0001 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
0xffffffff /* 1111 1111 1111 1111 1111 1111 1111 1111 */
};
/* " ", "%", %00-%1F */
static uint32_t memcached[] = {
0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
/* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */
0x00000021, /* 0000 0000 0000 0000 0000 0000 0010 0001 */
/* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */
0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */
/* ~}| {zyx wvut srqp onml kjih gfed cba` */
0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */
0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */
0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */
0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */
0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */
};
/* mail_auth is the same as memcached */
static uint32_t *map[] =
{ uri, args, uri_component, html, refresh, memcached, memcached };
escape = map[type];
if (dst == NULL) {
/* find the number of the characters to be escaped */
n = 0;
while (size) {
if (escape[*src >> 5] & (1U << (*src & 0x1f))) {
n++;
}
src++;
size--;
}
return (uintptr_t) n;
}
while (size) {
if (escape[*src >> 5] & (1U << (*src & 0x1f))) {
*dst++ = '%';
*dst++ = hex[*src >> 4];
*dst++ = hex[*src & 0xf];
src++;
} else {
*dst++ = *src++;
}
size--;
}
return (uintptr_t) dst;
}
void ngx_unescape_uri(u_char **dst, u_char **src, size_t size, unsigned int type)
{
u_char *d, *s, ch, c, decoded;
enum {
sw_usual = 0,
sw_quoted,
sw_quoted_second
} state;
d = *dst;
s = *src;
state = 0;
decoded = 0;
while (size--) {
ch = *s++;
switch (state) {
case sw_usual:
if (ch == '?'
&& (type & (NGX_UNESCAPE_URI | NGX_UNESCAPE_REDIRECT))) {
*d++ = ch;
goto done;
}
if (ch == '%') {
state = sw_quoted;
break;
}
*d++ = ch;
break;
case sw_quoted:
if (ch >= '0' && ch <= '9') {
decoded = (u_char) (ch - '0');
state = sw_quoted_second;
break;
}
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'f') {
decoded = (u_char) (c - 'a' + 10);
state = sw_quoted_second;
break;
}
/* the invalid quoted character */
state = sw_usual;
*d++ = ch;
break;
case sw_quoted_second:
state = sw_usual;
if (ch >= '0' && ch <= '9') {
ch = (u_char) ((decoded << 4) + (ch - '0'));
if (type & NGX_UNESCAPE_REDIRECT) {
if (ch > '%' && ch < 0x7f) {
*d++ = ch;
break;
}
*d++ = '%'; *d++ = *(s - 2); *d++ = *(s - 1);
break;
}
*d++ = ch;
break;
}
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'f') {
ch = (u_char) ((decoded << 4) + (c - 'a') + 10);
if (type & NGX_UNESCAPE_URI) {
if (ch == '?') {
*d++ = ch;
goto done;
}
*d++ = ch;
break;
}
if (type & NGX_UNESCAPE_REDIRECT) {
if (ch == '?') {
*d++ = ch;
goto done;
}
if (ch > '%' && ch < 0x7f) {
*d++ = ch;
break;
}
*d++ = '%'; *d++ = *(s - 2); *d++ = *(s - 1);
break;
}
*d++ = ch;
break;
}
/* the invalid quoted character */
break;
}
}
done:
*dst = d;
*src = s;
}
uint32_t example_uri_encode(char *dest, const char *src, size_t len)
{
if (!src || !dest) {
return 0;
}
uintptr_t ret = ngx_escape_uri((unsigned char *)dest, (unsigned char *)src, len, NGX_ESCAPE_URI_COMPONENT);
return (uint32_t)(ret - (uintptr_t)dest);
}
void example_uri_decode(char *dest, const char *src, size_t len)
{
if (!src || !dest) {
return;
}
unsigned char *src_ptr = (unsigned char *)src;
unsigned char *dst_ptr = (unsigned char *)dest;
ngx_unescape_uri(&dst_ptr, &src_ptr, len, NGX_UNESCAPE_URI);
}
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