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networkd DHCPv4 logging endian fix

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On Tue, Feb 10, 2015 at 08:10:43PM +0100, Lennart Poettering wrote:

> Hmm, I think it would be nicer to use be32toh() here instead, since it
> ensures the macro is (to a limited degree) typesafe.
>
> Any chance you could rework that?

From: Paul Martin <paul.martin@codethink.co.uk>
Date: Wed, 11 Feb 2015 11:47:16 +0000
Subject: [PATCH] networkd dhcpv4 logging endian fix

On a big-endian host, systemd-networkd prints out IPv4 network
addresses byte reversed:

Feb 10 16:43:32 hostname systemd-networkd[151]: eth0 : DHCPv4 address 158.1.24.10/16 via 1.1.24.10

The address obtained is 10.24.1.158/16 and the route is

  10.24.0.0/16 dev eth0  src 10.24.1.187

The macro ADDRESS_FMT_VAL() unpacks a "struct in_addr" in a
little-endian specific manner.

This patch forces the passed address into host order, then unpacks it.

On an x86 later than i486, compiled with -O2, the only extra overhead
is a single bswap instruction.
This commit is contained in:
Paul Martin 2015-02-11 11:50:28 +00:00 committed by Lennart Poettering
parent b975b0d514
commit 804319344b
1 changed files with 7 additions and 5 deletions
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12
src/network/networkd-link.h
View File

@ -21,6 +21,8 @@
#pragma once
#include <endian.h>
#include "networkd.h"
typedef enum LinkState {
@ -152,8 +154,8 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
#define log_link_struct(link, level, ...) log_struct(level, "INTERFACE=%s", link->ifname, __VA_ARGS__)
#define ADDRESS_FMT_VAL(address) \
(address).s_addr & 0xFF, \
((address).s_addr >> 8) & 0xFF, \
((address).s_addr >> 16) & 0xFF, \
(address).s_addr >> 24
#define ADDRESS_FMT_VAL(address) \
be32toh((address).s_addr) >> 24, \
(be32toh((address).s_addr) >> 16) & 0xFFu, \
(be32toh((address).s_addr) >> 8) & 0xFFu, \
be32toh((address).s_addr) & 0xFFu