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net/DscpParser: new library

This commit is contained in:
Max Kellermann 2022-01-11 20:05:34 +01:00
parent d79bf853b1
commit 16f7ec9950
3 changed files with 164 additions and 0 deletions
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116
src/net/DscpParser.cxx Normal file
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@ -0,0 +1,116 @@
/*
* Copyright 2022 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - 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 COPYRIGHT HOLDERS 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
* FOUNDATION 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 "DscpParser.hxx"
#include "util/StringAPI.hxx"
#include <cstdlib>
#ifdef _WIN32
#include <ws2tcpip.h>
#else
#include <netinet/ip.h>
#endif
#ifndef IPTOS_DSCP_AF11
#define IPTOS_DSCP_AF11 0x28
#define IPTOS_DSCP_AF12 0x30
#define IPTOS_DSCP_AF13 0x38
#define IPTOS_DSCP_AF21 0x48
#define IPTOS_DSCP_AF22 0x50
#define IPTOS_DSCP_AF23 0x58
#define IPTOS_DSCP_AF31 0x68
#define IPTOS_DSCP_AF32 0x70
#define IPTOS_DSCP_AF33 0x78
#define IPTOS_DSCP_AF41 0x88
#define IPTOS_DSCP_AF42 0x90
#define IPTOS_DSCP_AF43 0x98
#endif
#ifndef IPTOS_DSCP_CS0
#define IPTOS_DSCP_CS0 0x00
#define IPTOS_DSCP_CS1 0x20
#define IPTOS_DSCP_CS2 0x40
#define IPTOS_DSCP_CS3 0x60
#define IPTOS_DSCP_CS4 0x80
#define IPTOS_DSCP_CS5 0xa0
#define IPTOS_DSCP_CS6 0xc0
#define IPTOS_DSCP_CS7 0xe0
#endif
#ifndef IPTOS_DSCP_EF
#define IPTOS_DSCP_EF 0xb8
#endif
#ifndef IPTOS_DSCP_LE
#define IPTOS_DSCP_LE 0x01
#endif
static constexpr struct {
const char *name;
int value;
} dscp_classes[] = {
{ "AF11", IPTOS_DSCP_AF11 },
{ "AF12", IPTOS_DSCP_AF12 },
{ "AF13", IPTOS_DSCP_AF13 },
{ "AF21", IPTOS_DSCP_AF21 },
{ "AF22", IPTOS_DSCP_AF22 },
{ "AF23", IPTOS_DSCP_AF23 },
{ "AF31", IPTOS_DSCP_AF31 },
{ "AF32", IPTOS_DSCP_AF32 },
{ "AF33", IPTOS_DSCP_AF33 },
{ "AF41", IPTOS_DSCP_AF41 },
{ "AF42", IPTOS_DSCP_AF42 },
{ "AF43", IPTOS_DSCP_AF43 },
{ "CS0", IPTOS_DSCP_CS0 },
{ "CS1", IPTOS_DSCP_CS1 },
{ "CS2", IPTOS_DSCP_CS2 },
{ "CS3", IPTOS_DSCP_CS3 },
{ "CS4", IPTOS_DSCP_CS4 },
{ "CS5", IPTOS_DSCP_CS5 },
{ "CS6", IPTOS_DSCP_CS6 },
{ "CS7", IPTOS_DSCP_CS7 },
{ "EF", IPTOS_DSCP_EF },
{ "LE", IPTOS_DSCP_LE },
};
int
ParseDscpClass(const char *s) noexcept
{
for (const auto &i : dscp_classes)
if (StringIsEqualIgnoreCase(s, i.name))
return i.value;
char *endptr;
unsigned long value = strtoul(s, &endptr, 0);
if (endptr > s && *endptr == 0 && value <= 0xff)
return value;
return -1;
}

41
src/net/DscpParser.hxx Normal file
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@ -0,0 +1,41 @@
/*
* Copyright 2022 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - 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 COPYRIGHT HOLDERS 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
* FOUNDATION 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.
*/
#pragma once
/**
* Parse a DSCP (Differentiated Services Code Point) class name.
* This can either be a name (CS*, LE, AF*, EF) or numeric (decimal or
* hexadecimal).
*
* @return the DSCP or -1 on error
*/
[[gnu::pure]]
int
ParseDscpClass(const char *s) noexcept;

7
src/net/meson.build
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@ -1,6 +1,12 @@
net_sources = []
have_tcp = get_option('tcp')
conf.set('HAVE_TCP', have_tcp)
if have_tcp
net_sources += 'DscpParser.cxx'
endif
if have_tcp and not get_option('ipv6').disabled()
if is_windows
have_ipv6 = c_compiler.has_header_symbol('winsock2.h', 'AF_INET6')
@ -29,6 +35,7 @@ endif
net = static_library(
'net',
net_sources,
'ToString.cxx',
'HostParser.cxx',
'Resolver.cxx',