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| | /* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright Red Hat
* Author: David Gibson <david@gibson.dropbear.id.au>
*
* inany.c - Types and helpers for handling addresses which could be
* IPv6 or IPv4 (encoded as IPv4-mapped IPv6 addresses)
*/
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include "util.h"
#include "ip.h"
#include "siphash.h"
#include "inany.h"
#include "fwd.h"
const union inany_addr inany_loopback4 = INANY_INIT4(IN4ADDR_LOOPBACK_INIT);
const union inany_addr inany_any4 = INANY_INIT4(IN4ADDR_ANY_INIT);
/** inany_ntop - Convert an IPv[46] address to text format
* @src: IPv[46] address
* @dst: output buffer, minimum INANY_ADDRSTRLEN bytes
* @size: size of buffer at @dst
*
* Return: on success, a non-null pointer to @dst, NULL on failure
*/
const char *inany_ntop(const union inany_addr *src, char *dst, socklen_t size)
{
const struct in_addr *v4 = inany_v4(src);
if (v4)
return inet_ntop(AF_INET, v4, dst, size);
return inet_ntop(AF_INET6, &src->a6, dst, size);
}
/** inany_pton - Parse an IPv[46] address from text format
* @src: IPv[46] address
* @dst: output buffer, filled with parsed address
*
* Return: on success, 1, if no parseable address is found, 0
*/
int inany_pton(const char *src, union inany_addr *dst)
{
if (inet_pton(AF_INET, src, &dst->v4mapped.a4)) {
memset(&dst->v4mapped.zero, 0, sizeof(dst->v4mapped.zero));
memset(&dst->v4mapped.one, 0xff, sizeof(dst->v4mapped.one));
return 1;
}
if (inet_pton(AF_INET6, src, &dst->a6))
return 1;
return 0;
}
/** inany_prefix_pton - Parse an IPv[46] address with prefix length adjustment
* @src: IPv[46] address string
* @dst: output buffer, filled with parsed address
* @prefix_len: pointer to prefix length
*
* Return: AF_INET for IPv4, AF_INET6 for IPv6, -1 on error
*/
int inany_prefix_pton(char *src, union inany_addr *dst, int *prefix_len)
{
bool mapped = false;
struct in6_addr a6;
struct in_addr a4;
char *slash;
char *end;
int af;
*prefix_len = 0;
/* Check for presence of /prefix_len suffix */
slash = strchr(src, '/');
if (slash)
*slash = '\0';
/* Read address */
if (inet_pton(AF_INET, src, &a4)) {
inany_from_af(dst, AF_INET, &a4);
af = AF_INET;
} else if (inet_pton(AF_INET6, src, &a6)) {
inany_from_af(dst, AF_INET6, &a6);
af = AF_INET6;
if (inany_v4(dst))
mapped = true;
} else {
memset(dst, 0, sizeof(*dst));
return -1;
}
if (!slash)
return mapped ? AF_INET : af;
/* Read prefix_len - /0 is not allowed */
errno = 0;
*prefix_len = strtoul(slash + 1, &end, 10);
if (errno || *end || *prefix_len == 0)
return -1;
if (mapped) {
/* IPv4-mapped: prefix already in IPv6 format, must be 96-128 */
if (*prefix_len < 96 || *prefix_len > 128)
return -1;
return AF_INET;
}
if (af == AF_INET) {
/* Native IPv4: convert to IPv6 format */
if (*prefix_len > 32)
return -1;
*prefix_len += 96;
return AF_INET;
}
/* Native IPv6: keep as-is */
if (*prefix_len > 128)
return -1;
return AF_INET6;
}
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