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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <inttypes.h>
#include <stdbool.h>
#include <string.h>
#include <isc/net.h>
#include <isc/netaddr.h>
#include <isc/netdb.h>
#include <isc/netscope.h>
#include <isc/result.h>
#include <isc/sockaddr.h>
#include <isc/string.h>
#include <isc/util.h>
#include <bind9/getaddresses.h>
isc_result_t
bind9_getaddresses(const char *hostname, in_port_t port, isc_sockaddr_t *addrs,
int addrsize, int *addrcount) {
struct in_addr in4;
struct in6_addr in6;
bool have_ipv4, have_ipv6;
int i;
struct addrinfo *ai = NULL, *tmpai, hints;
int result;
REQUIRE(hostname != NULL);
REQUIRE(addrs != NULL);
REQUIRE(addrcount != NULL);
REQUIRE(addrsize > 0);
have_ipv4 = (isc_net_probeipv4() == ISC_R_SUCCESS);
have_ipv6 = (isc_net_probeipv6() == ISC_R_SUCCESS);
/*
* Try IPv4, then IPv6. In order to handle the extended format
* for IPv6 scoped addresses (address%scope_ID), we'll use a local
* working buffer of 128 bytes. The length is an ad-hoc value, but
* should be enough for this purpose; the buffer can contain a string
* of at least 80 bytes for scope_ID in addition to any IPv6 numeric
* addresses (up to 46 bytes), the delimiter character and the
* terminating NULL character.
*/
if (inet_pton(AF_INET, hostname, &in4) == 1) {
if (have_ipv4) {
isc_sockaddr_fromin(&addrs[0], &in4, port);
} else {
isc_sockaddr_v6fromin(&addrs[0], &in4, port);
}
*addrcount = 1;
return (ISC_R_SUCCESS);
} else if (strlen(hostname) <= 127U) {
char tmpbuf[128], *d;
uint32_t zone = 0;
strlcpy(tmpbuf, hostname, sizeof(tmpbuf));
d = strchr(tmpbuf, '%');
if (d != NULL) {
*d = '\0';
}
if (inet_pton(AF_INET6, tmpbuf, &in6) == 1) {
isc_netaddr_t na;
if (!have_ipv6) {
return (ISC_R_FAMILYNOSUPPORT);
}
if (d != NULL) {
isc_result_t iresult;
iresult = isc_netscope_pton(AF_INET6, d + 1,
&in6, &zone);
if (iresult != ISC_R_SUCCESS) {
return (iresult);
}
}
isc_netaddr_fromin6(&na, &in6);
isc_netaddr_setzone(&na, zone);
isc_sockaddr_fromnetaddr(
&addrs[0], (const isc_netaddr_t *)&na, port);
*addrcount = 1;
return (ISC_R_SUCCESS);
}
}
memset(&hints, 0, sizeof(hints));
if (!have_ipv6) {
hints.ai_family = PF_INET;
} else if (!have_ipv4) {
hints.ai_family = PF_INET6;
} else {
hints.ai_family = PF_UNSPEC;
#ifdef AI_ADDRCONFIG
hints.ai_flags = AI_ADDRCONFIG;
#endif /* ifdef AI_ADDRCONFIG */
}
hints.ai_socktype = SOCK_STREAM;
#ifdef AI_ADDRCONFIG
again:
#endif /* ifdef AI_ADDRCONFIG */
result = getaddrinfo(hostname, NULL, &hints, &ai);
switch (result) {
case 0:
break;
case EAI_NONAME:
#if defined(EAI_NODATA) && (EAI_NODATA != EAI_NONAME)
case EAI_NODATA:
#endif /* if defined(EAI_NODATA) && (EAI_NODATA != EAI_NONAME) */
return (ISC_R_NOTFOUND);
#ifdef AI_ADDRCONFIG
case EAI_BADFLAGS:
if ((hints.ai_flags & AI_ADDRCONFIG) != 0) {
hints.ai_flags &= ~AI_ADDRCONFIG;
goto again;
}
#endif /* ifdef AI_ADDRCONFIG */
FALLTHROUGH;
default:
return (ISC_R_FAILURE);
}
for (tmpai = ai, i = 0; tmpai != NULL && i < addrsize;
tmpai = tmpai->ai_next)
{
if (tmpai->ai_family != AF_INET && tmpai->ai_family != AF_INET6)
{
continue;
}
if (tmpai->ai_family == AF_INET) {
struct sockaddr_in *sin;
sin = (struct sockaddr_in *)tmpai->ai_addr;
isc_sockaddr_fromin(&addrs[i], &sin->sin_addr, port);
} else {
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)tmpai->ai_addr;
isc_sockaddr_fromin6(&addrs[i], &sin6->sin6_addr, port);
}
i++;
}
freeaddrinfo(ai);
*addrcount = i;
if (*addrcount == 0) {
return (ISC_R_NOTFOUND);
} else {
return (ISC_R_SUCCESS);
}
}
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