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/* Copyright (C) 2021
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting
* documentation, and that the name of M.I.T. not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is"
* without express or implied warranty.
*/
#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>
#include <iphlpapi.h>
#endif
#include "ares.h"
#include "ares_inet_net_pton.h"
#include "ares_nowarn.h"
#include "ares_private.h"
int ares_append_ai_node(int aftype,
unsigned short port,
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 = 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 = ttl;
}
return ARES_SUCCESS;
}
static int ares__default_loopback_addrs(int aftype,
unsigned short port,
struct ares_addrinfo_node **nodes)
{
int 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 int 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;
int status;
*nodes = NULL;
if (GetUnicastIpAddressTable(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
}
int 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;
int result;
/* 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;
}
result = ares__system_loopback_addrs(hints->ai_family, port, &nodes);
if (result == ARES_ENOTFOUND)
{
result = ares__default_loopback_addrs(hints->ai_family, port, &nodes);
}
ares__addrinfo_cat_nodes(&ai->nodes, nodes);
return result;
enomem:
ares__freeaddrinfo_nodes(nodes);
ares_free(ai->name);
ai->name = NULL;
return ARES_ENOMEM;
}
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