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/* MIT License
*
* Copyright (c) Massachusetts Institute of Technology
* Copyright (c) Daniel Stenberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* SPDX-License-Identifier: MIT
*/
#include "ares_setup.h"
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
# include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#if defined(_WIN32) && defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0600
# include <ws2ipdef.h>
#endif
#if defined(USE_WINSOCK)
# if defined(HAVE_IPHLPAPI_H)
# include <iphlpapi.h>
# endif
# if defined(HAVE_NETIOAPI_H)
# include <netioapi.h>
# endif
#endif
#include "ares.h"
#include "ares_inet_net_pton.h"
#include "ares_private.h"
ares_status_t ares_append_ai_node(int aftype, unsigned short port,
unsigned int ttl, const void *adata,
struct ares_addrinfo_node **nodes)
{
struct ares_addrinfo_node *node;
node = ares__append_addrinfo_node(nodes);
if (!node) {
return ARES_ENOMEM;
}
memset(node, 0, sizeof(*node));
if (aftype == AF_INET) {
struct sockaddr_in *sin = ares_malloc(sizeof(*sin));
if (!sin) {
return ARES_ENOMEM;
}
memset(sin, 0, sizeof(*sin));
memcpy(&sin->sin_addr.s_addr, adata, sizeof(sin->sin_addr.s_addr));
sin->sin_family = AF_INET;
sin->sin_port = htons(port);
node->ai_addr = (struct sockaddr *)sin;
node->ai_family = AF_INET;
node->ai_addrlen = sizeof(*sin);
node->ai_addr = (struct sockaddr *)sin;
node->ai_ttl = (int)ttl;
}
if (aftype == AF_INET6) {
struct sockaddr_in6 *sin6 = ares_malloc(sizeof(*sin6));
if (!sin6) {
return ARES_ENOMEM;
}
memset(sin6, 0, sizeof(*sin6));
memcpy(&sin6->sin6_addr.s6_addr, adata, sizeof(sin6->sin6_addr.s6_addr));
sin6->sin6_family = AF_INET6;
sin6->sin6_port = htons(port);
node->ai_addr = (struct sockaddr *)sin6;
node->ai_family = AF_INET6;
node->ai_addrlen = sizeof(*sin6);
node->ai_addr = (struct sockaddr *)sin6;
node->ai_ttl = (int)ttl;
}
return ARES_SUCCESS;
}
static ares_status_t
ares__default_loopback_addrs(int aftype, unsigned short port,
struct ares_addrinfo_node **nodes)
{
ares_status_t status = ARES_SUCCESS;
if (aftype == AF_UNSPEC || aftype == AF_INET6) {
struct ares_in6_addr addr6;
ares_inet_pton(AF_INET6, "::1", &addr6);
status = ares_append_ai_node(AF_INET6, port, 0, &addr6, nodes);
if (status != ARES_SUCCESS) {
return status;
}
}
if (aftype == AF_UNSPEC || aftype == AF_INET) {
struct in_addr addr4;
ares_inet_pton(AF_INET, "127.0.0.1", &addr4);
status = ares_append_ai_node(AF_INET, port, 0, &addr4, nodes);
if (status != ARES_SUCCESS) {
return status;
}
}
return status;
}
static ares_status_t
ares__system_loopback_addrs(int aftype, unsigned short port,
struct ares_addrinfo_node **nodes)
{
#if defined(_WIN32) && defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0600 && \
!defined(__WATCOMC__)
PMIB_UNICASTIPADDRESS_TABLE table;
unsigned int i;
ares_status_t status;
*nodes = NULL;
if (GetUnicastIpAddressTable((ADDRESS_FAMILY)aftype, &table) != NO_ERROR) {
return ARES_ENOTFOUND;
}
for (i = 0; i < table->NumEntries; i++) {
if (table->Table[i].InterfaceLuid.Info.IfType !=
IF_TYPE_SOFTWARE_LOOPBACK) {
continue;
}
if (table->Table[i].Address.si_family == AF_INET) {
status =
ares_append_ai_node(table->Table[i].Address.si_family, port, 0,
&table->Table[i].Address.Ipv4.sin_addr, nodes);
} else if (table->Table[i].Address.si_family == AF_INET6) {
status =
ares_append_ai_node(table->Table[i].Address.si_family, port, 0,
&table->Table[i].Address.Ipv6.sin6_addr, nodes);
} else {
/* Ignore any others */
continue;
}
if (status != ARES_SUCCESS) {
goto fail;
}
}
if (*nodes == NULL) {
status = ARES_ENOTFOUND;
}
fail:
FreeMibTable(table);
if (status != ARES_SUCCESS) {
ares__freeaddrinfo_nodes(*nodes);
*nodes = NULL;
}
return status;
#else
(void)aftype;
(void)port;
(void)nodes;
/* Not supported on any other OS at this time */
return ARES_ENOTFOUND;
#endif
}
ares_status_t ares__addrinfo_localhost(const char *name, unsigned short port,
const struct ares_addrinfo_hints *hints,
struct ares_addrinfo *ai)
{
struct ares_addrinfo_node *nodes = NULL;
ares_status_t status;
/* Validate family */
switch (hints->ai_family) {
case AF_INET:
case AF_INET6:
case AF_UNSPEC:
break;
default:
return ARES_EBADFAMILY;
}
ai->name = ares_strdup(name);
if (!ai->name) {
goto enomem;
}
status = ares__system_loopback_addrs(hints->ai_family, port, &nodes);
if (status == ARES_ENOTFOUND) {
status = ares__default_loopback_addrs(hints->ai_family, port, &nodes);
}
ares__addrinfo_cat_nodes(&ai->nodes, nodes);
return status;
enomem:
ares__freeaddrinfo_nodes(nodes);
ares_free(ai->name);
ai->name = NULL;
return ARES_ENOMEM;
}
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