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/*
* Replacement for a missing inet_ntop.
*
* Provides an implementation of inet_ntop that only supports IPv4 addresses
* for hosts that are missing it. If you want IPv6 support, you need to have
* a real inet_ntop function; this function is only provided so that code can
* call inet_ntop unconditionally without needing to worry about whether the
* host supports IPv6.
*
* The canonical version of this file is maintained in the rra-c-util package,
* which can be found at <https://www.eyrie.org/~eagle/software/rra-c-util/>.
*
* Written by Russ Allbery <eagle@eyrie.org>
* Copyright 2005 Russ Allbery <eagle@eyrie.org>
* Copyright 2008, 2011, 2013-2014
* The Board of Trustees of the Leland Stanford Junior University
*
* Copying and distribution of this file, with or without modification, are
* permitted in any medium without royalty provided the copyright notice and
* this notice are preserved. This file is offered as-is, without any
* warranty.
*
* SPDX-License-Identifier: FSFAP
*/
#include <config.h>
#include <portable/system.h>
#include <portable/socket.h>
#include <errno.h>
/* This may already be defined by the system headers. */
#ifndef INET_ADDRSTRLEN
# define INET_ADDRSTRLEN 16
#endif
/* Systems old enough to not support inet_ntop may not have this either. */
#ifndef EAFNOSUPPORT
# define EAFNOSUPPORT EDOM
#endif
/*
* If we're running the test suite, rename inet_ntop to avoid conflicts with
* the system version.
*/
#if TESTING
# undef inet_ntop
# define inet_ntop test_inet_ntop
const char *test_inet_ntop(int, const void *, char *, socklen_t);
#endif
const char *
inet_ntop(int af, const void *src, char *dst, socklen_t size)
{
const unsigned char *p;
int status;
if (af != AF_INET) {
socket_set_errno(EAFNOSUPPORT);
return NULL;
}
if (size < INET_ADDRSTRLEN) {
errno = ENOSPC;
return NULL;
}
p = src;
status = snprintf(dst, size, "%u.%u.%u.%u",
(unsigned int) (p[0] & 0xff),
(unsigned int) (p[1] & 0xff),
(unsigned int) (p[2] & 0xff),
(unsigned int) (p[3] & 0xff));
if (status < 0 || (size_t) status >= (size_t) size)
return NULL;
return dst;
}
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