2020-03-31 20:21:04 +02:00
|
|
|
/****************************************************************************
|
|
|
|
* libs/libc/netdb/lib_gethostentbynamer.c
|
|
|
|
*
|
|
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
|
|
* this work for additional information regarding copyright ownership. The
|
|
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
|
|
* "License"); you may not use this file except in compliance with the
|
|
|
|
* License. You may obtain a copy of the License at
|
|
|
|
*
|
|
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
*
|
|
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
|
|
* License for the specific language governing permissions and limitations
|
|
|
|
* under the License.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Included Files
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <sys/socket.h>
|
|
|
|
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <netdb.h>
|
|
|
|
#include <errno.h>
|
|
|
|
#include <assert.h>
|
|
|
|
|
|
|
|
#include <arpa/inet.h>
|
|
|
|
|
|
|
|
#include <nuttx/net/dns.h>
|
|
|
|
#include <nuttx/net/loopback.h>
|
|
|
|
|
|
|
|
#include "netdb/lib_dns.h"
|
|
|
|
#include "netdb/lib_netdb.h"
|
|
|
|
|
|
|
|
#ifdef CONFIG_LIBC_NETDB
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Private Type Definitions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/* This is the layout of the caller provided memory area */
|
|
|
|
|
|
|
|
struct hostent_info_s
|
|
|
|
{
|
|
|
|
int hi_addrtypes[CONFIG_NETDB_MAX_IPADDR + 1];
|
|
|
|
int hi_lengths[CONFIG_NETDB_MAX_IPADDR + 1];
|
|
|
|
FAR char *hi_addrlist[CONFIG_NETDB_MAX_IPADDR + 1];
|
|
|
|
char hi_data[1];
|
|
|
|
};
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Private functions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: lib_numeric_address
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Check if the name is a numeric IP address. In this case, simply copy
|
|
|
|
* name into the h_name field and its struct in_addr equivalent into the
|
|
|
|
* h_addr_list[0] field of the returned hostent structure.
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* name - The name of the host to find.
|
|
|
|
* host - Caller provided location to return the host data.
|
|
|
|
* buf - Caller provided buffer to hold string data associated with the
|
|
|
|
* host data.
|
|
|
|
* buflen - The size of the caller-provided buffer
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* Zero (0) is returned if the name is an numeric IP address.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
static int lib_numeric_address(FAR const char *name,
|
|
|
|
FAR struct hostent_s *host,
|
|
|
|
FAR char *buf, size_t buflen)
|
|
|
|
{
|
|
|
|
FAR struct hostent_info_s *info;
|
|
|
|
FAR char *ptr;
|
|
|
|
socklen_t addrlen;
|
|
|
|
int namelen;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
/* Verify that we have a buffer big enough to get started (it still may not
|
|
|
|
* be big enough).
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (buflen <= sizeof(struct hostent_info_s))
|
|
|
|
{
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
|
|
|
|
info = (FAR struct hostent_info_s *)buf;
|
|
|
|
ptr = info->hi_data;
|
|
|
|
buflen -= (sizeof(struct hostent_info_s) - 1);
|
|
|
|
|
|
|
|
memset(host, 0, sizeof(struct hostent_s));
|
|
|
|
memset(info, 0, sizeof(struct hostent_info_s));
|
|
|
|
|
|
|
|
host->h_addrtypes = info->hi_addrtypes;
|
|
|
|
host->h_lengths = info->hi_lengths;
|
|
|
|
host->h_addr_list = info->hi_addrlist;
|
|
|
|
|
|
|
|
/* If the address contains a colon, then it might be a numeric IPv6
|
|
|
|
* address
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (strchr(name, ':') != NULL)
|
|
|
|
{
|
|
|
|
/* Make sure that space remains to hold the IPv6 address */
|
|
|
|
|
|
|
|
addrlen = sizeof(struct in6_addr);
|
|
|
|
if (buflen < addrlen)
|
|
|
|
{
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = inet_pton(AF_INET6, name, ptr);
|
|
|
|
|
|
|
|
/* The inet_pton() function returns 1 if the conversion succeeds. It
|
|
|
|
* will return 0 if the input is not a valid IP address string, or -1
|
|
|
|
* if the address family argument is unsupported.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (ret < 1)
|
|
|
|
{
|
|
|
|
/* Conversion failed. Must not be a IPv6 address */
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
host->h_addrtypes[0] = AF_INET6;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* If the address contains a colon, then it might be a numeric IPv6
|
|
|
|
* address.
|
|
|
|
*/
|
|
|
|
|
|
|
|
else if (strchr(name, '.') != NULL)
|
|
|
|
{
|
|
|
|
/* Make sure that space remains to hold the IPv4 address */
|
|
|
|
|
|
|
|
addrlen = sizeof(struct in_addr);
|
|
|
|
if (buflen < addrlen)
|
|
|
|
{
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = inet_pton(AF_INET, name, ptr);
|
|
|
|
|
|
|
|
/* The inet_pton() function returns 1 if the conversion succeeds. It
|
|
|
|
* will return 0 if the input is not a valid IP address string, or -1
|
|
|
|
* if the address family argument is unsupported.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (ret < 1)
|
|
|
|
{
|
|
|
|
/* Conversion failed. Must not be an IPv4 address */
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
host->h_addrtypes[0] = AF_INET;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* No colon? No period? Can't be a numeric address */
|
|
|
|
|
|
|
|
else
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
host->h_addr_list[0] = ptr;
|
|
|
|
host->h_lengths[0] = addrlen;
|
|
|
|
|
|
|
|
ptr += addrlen;
|
|
|
|
buflen -= addrlen;
|
|
|
|
|
|
|
|
/* And copy name */
|
|
|
|
|
|
|
|
namelen = strlen(name);
|
|
|
|
if ((namelen + 1) > buflen)
|
|
|
|
{
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
|
|
|
|
strncpy(ptr, name, buflen);
|
|
|
|
|
|
|
|
/* Set the address to h_name */
|
|
|
|
|
|
|
|
host->h_name = ptr;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: lib_localhost
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Check if the name is the reserved name for the local loopback device.
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* name - The name of the host to find.
|
|
|
|
* host - Caller provided location to return the host data.
|
|
|
|
* buf - Caller provided buffer to hold string data associated with the
|
|
|
|
* host data.
|
|
|
|
* buflen - The size of the caller-provided buffer
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* Zero (0) is returned if the name is the loopback device.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_LOOPBACK
|
|
|
|
static int lib_localhost(FAR const char *name, FAR struct hostent_s *host,
|
|
|
|
FAR char *buf, size_t buflen)
|
|
|
|
{
|
|
|
|
FAR struct hostent_info_s *info;
|
|
|
|
FAR char *dest;
|
|
|
|
int namelen;
|
|
|
|
int i = 0;
|
|
|
|
|
|
|
|
if (strcmp(name, g_lo_hostname) == 0)
|
|
|
|
{
|
|
|
|
/* Yes.. it is the localhost */
|
|
|
|
|
|
|
|
/* Make sure that space remains to hold the hostent structure */
|
|
|
|
|
|
|
|
if (buflen <= sizeof(struct hostent_info_s))
|
|
|
|
{
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
|
|
|
|
info = (FAR struct hostent_info_s *)buf;
|
|
|
|
dest = info->hi_data;
|
|
|
|
buflen -= (sizeof(struct hostent_info_s) - 1);
|
|
|
|
|
|
|
|
memset(host, 0, sizeof(struct hostent_s));
|
|
|
|
memset(info, 0, sizeof(struct hostent_info_s));
|
|
|
|
|
|
|
|
host->h_addrtypes = info->hi_addrtypes;
|
|
|
|
host->h_lengths = info->hi_lengths;
|
|
|
|
host->h_addr_list = info->hi_addrlist;
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
/* Save the IPv4 address */
|
|
|
|
|
|
|
|
info->hi_addrtypes[i] = AF_INET;
|
|
|
|
info->hi_lengths[i] = sizeof(struct in_addr);
|
|
|
|
info->hi_addrlist[i] = (FAR char *)&g_lo_ipv4addr;
|
|
|
|
i++;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
/* Save the IPv6 address */
|
|
|
|
|
|
|
|
info->hi_addrtypes[i] = AF_INET6;
|
|
|
|
info->hi_lengths[i] = sizeof(struct in6_addr);
|
|
|
|
info->hi_addrlist[i] = (FAR char *)&g_lo_ipv6addr;
|
|
|
|
i++;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* And copy name */
|
|
|
|
|
|
|
|
namelen = strlen(name);
|
|
|
|
if ((namelen + 1) > buflen)
|
|
|
|
{
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
|
|
|
|
strncpy(dest, name, buflen);
|
|
|
|
|
|
|
|
/* Set the address to h_name */
|
|
|
|
|
|
|
|
host->h_name = dest;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: lib_find_answer
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Check if we previously resolved this hostname and if that resolved
|
|
|
|
* address is already available in the DNS cache.
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* name - The name of the host to find.
|
|
|
|
* host - Caller provided location to return the host data.
|
|
|
|
* buf - Caller provided buffer to hold string data associated with the
|
|
|
|
* host data.
|
|
|
|
* buflen - The size of the caller-provided buffer
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* Zero (0) is returned if the DNS lookup was successful.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
#ifdef CONFIG_NETDB_DNSCLIENT
|
|
|
|
#if CONFIG_NETDB_DNSCLIENT_ENTRIES > 0
|
|
|
|
static int lib_find_answer(FAR const char *name, FAR struct hostent_s *host,
|
|
|
|
FAR char *buf, size_t buflen)
|
|
|
|
{
|
|
|
|
FAR struct hostent_info_s *info;
|
|
|
|
FAR char *ptr;
|
|
|
|
FAR void *addrdata;
|
|
|
|
socklen_t addrlen;
|
|
|
|
int naddr;
|
|
|
|
int addrtype;
|
|
|
|
int namelen;
|
|
|
|
int ret;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
/* Verify that we have a buffer big enough to get started (it still may not
|
|
|
|
* be big enough).
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (buflen <= sizeof(struct hostent_info_s))
|
|
|
|
{
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Initialize buffers */
|
|
|
|
|
|
|
|
info = (FAR struct hostent_info_s *)buf;
|
|
|
|
ptr = info->hi_data;
|
|
|
|
buflen -= (sizeof(struct hostent_info_s) - 1);
|
|
|
|
|
|
|
|
/* Verify again that there is space for at least one address. */
|
|
|
|
|
|
|
|
if (buflen < sizeof(union dns_addr_u))
|
|
|
|
{
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
|
|
|
|
memset(host, 0, sizeof(struct hostent_s));
|
|
|
|
memset(info, 0, sizeof(struct hostent_info_s));
|
|
|
|
|
|
|
|
host->h_addrtypes = info->hi_addrtypes;
|
|
|
|
host->h_lengths = info->hi_lengths;
|
|
|
|
host->h_addr_list = info->hi_addrlist;
|
|
|
|
|
|
|
|
/* Try to get the host address using the DNS name server */
|
|
|
|
|
|
|
|
naddr = buflen / sizeof(union dns_addr_u);
|
|
|
|
ret = dns_find_answer(name, (FAR union dns_addr_u *)ptr, &naddr);
|
|
|
|
if (ret < 0)
|
|
|
|
{
|
|
|
|
/* No, nothing found in the cache */
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
DEBUGASSERT(naddr <= CONFIG_NETDB_MAX_IPADDR);
|
|
|
|
|
|
|
|
/* Get the address type. */
|
|
|
|
|
|
|
|
for (i = 0; i < naddr; i++)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
if (((FAR struct sockaddr_in *)ptr)->sin_family == AF_INET)
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
addrlen = sizeof(struct in_addr);
|
|
|
|
addrtype = AF_INET;
|
|
|
|
addrdata = &((FAR struct sockaddr_in *)ptr)->sin_addr;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
addrlen = sizeof(struct in6_addr);
|
|
|
|
addrtype = AF_INET6;
|
|
|
|
addrdata = &((FAR struct sockaddr_in6 *)ptr)->sin6_addr;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
info->hi_addrtypes[i] = addrtype;
|
|
|
|
info->hi_lengths[i] = addrlen;
|
|
|
|
info->hi_addrlist[i] = addrdata;
|
|
|
|
|
|
|
|
ptr += sizeof(union dns_addr_u);
|
|
|
|
buflen -= sizeof(union dns_addr_u);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* And copy name */
|
|
|
|
|
|
|
|
namelen = strlen(name);
|
|
|
|
if ((namelen + 1) > buflen)
|
|
|
|
{
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
|
|
|
|
strncpy(ptr, name, buflen);
|
|
|
|
|
|
|
|
/* Set the address to h_name */
|
|
|
|
|
|
|
|
host->h_name = ptr;
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif /* CONFIG_NETDB_DNSCLIENT */
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: lib_dns_query
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Combines the operations of dns_bind(), dns_query(), and dns_free() to
|
|
|
|
* obtain the IP address ('ipaddr') associated with the 'hostname' in one
|
|
|
|
* operation.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
#ifdef CONFIG_NETDB_DNSCLIENT
|
|
|
|
static int lib_dns_query(FAR const char *hostname,
|
|
|
|
FAR union dns_addr_u *addr, int *naddr)
|
|
|
|
{
|
|
|
|
int sd;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
/* Create and bind a socket to the DNS server */
|
|
|
|
|
|
|
|
sd = dns_bind();
|
|
|
|
if (sd < 0)
|
|
|
|
{
|
|
|
|
return sd;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Perform the query to get the IP address */
|
|
|
|
|
|
|
|
ret = dns_query(sd, hostname, addr, naddr);
|
|
|
|
|
|
|
|
/* Release the socket */
|
|
|
|
|
|
|
|
close(sd);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NETDB_DNSCLIENT */
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: lib_dns_lookup
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Try to look-up the host name from the DNS server
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* name - The name of the host to find.
|
|
|
|
* host - Caller provided location to return the host data.
|
|
|
|
* buf - Caller provided buffer to hold string data associated with the
|
|
|
|
* host data.
|
|
|
|
* buflen - The size of the caller-provided buffer
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* Zero (0) is returned if the DNS lookup was successful.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
#ifdef CONFIG_NETDB_DNSCLIENT
|
|
|
|
static int lib_dns_lookup(FAR const char *name, FAR struct hostent_s *host,
|
|
|
|
FAR char *buf, size_t buflen)
|
|
|
|
{
|
|
|
|
FAR struct hostent_info_s *info;
|
|
|
|
FAR char *ptr;
|
|
|
|
FAR void *addrdata;
|
|
|
|
socklen_t addrlen;
|
|
|
|
int naddr;
|
|
|
|
int addrtype;
|
|
|
|
int namelen;
|
|
|
|
int ret;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
/* Verify that we have a buffer big enough to get started (it still may not
|
|
|
|
* be big enough).
|
2020-05-15 06:43:34 +02:00
|
|
|
* Verify that there is space for at least one address.
|
2020-03-31 20:21:04 +02:00
|
|
|
*/
|
|
|
|
|
2020-05-15 06:43:34 +02:00
|
|
|
namelen = strlen(name);
|
|
|
|
if (buflen < sizeof(struct hostent_info_s) - 1 + sizeof(union dns_addr_u) +
|
|
|
|
namelen + 1)
|
2020-03-31 20:21:04 +02:00
|
|
|
{
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Initialize buffers */
|
|
|
|
|
|
|
|
info = (FAR struct hostent_info_s *)buf;
|
|
|
|
ptr = info->hi_data;
|
|
|
|
buflen -= (sizeof(struct hostent_info_s) - 1);
|
|
|
|
|
|
|
|
memset(host, 0, sizeof(struct hostent_s));
|
|
|
|
memset(info, 0, sizeof(struct hostent_info_s));
|
|
|
|
|
|
|
|
host->h_addrtypes = info->hi_addrtypes;
|
|
|
|
host->h_lengths = info->hi_lengths;
|
|
|
|
host->h_addr_list = info->hi_addrlist;
|
|
|
|
|
|
|
|
/* Try to get the host address using the DNS name server */
|
|
|
|
|
2020-05-15 06:43:34 +02:00
|
|
|
naddr = (buflen - (namelen + 1)) / sizeof(union dns_addr_u);
|
|
|
|
DEBUGASSERT(naddr >= 1);
|
2020-03-31 20:21:04 +02:00
|
|
|
ret = lib_dns_query(name, (FAR union dns_addr_u *)ptr, &naddr);
|
|
|
|
if (ret < 0)
|
|
|
|
{
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* We can read more than maximum, limit here. */
|
|
|
|
|
|
|
|
naddr = MIN(naddr, CONFIG_NETDB_MAX_IPADDR);
|
|
|
|
|
|
|
|
for (i = 0; i < naddr; i++)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
if (((FAR struct sockaddr_in *)ptr)->sin_family == AF_INET)
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
addrlen = sizeof(struct in_addr);
|
|
|
|
addrtype = AF_INET;
|
|
|
|
addrdata = &((FAR struct sockaddr_in *)ptr)->sin_addr;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
|
|
else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
addrlen = sizeof(struct in6_addr);
|
|
|
|
addrtype = AF_INET6;
|
|
|
|
addrdata = &((FAR struct sockaddr_in6 *)ptr)->sin6_addr;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
info->hi_addrtypes[i] = addrtype;
|
|
|
|
info->hi_lengths[i] = addrlen;
|
|
|
|
info->hi_addrlist[i] = addrdata;
|
|
|
|
|
2020-05-15 06:43:34 +02:00
|
|
|
DEBUGASSERT(buflen >= namelen + 1 + sizeof(union dns_addr_u));
|
2020-03-31 20:21:04 +02:00
|
|
|
ptr += sizeof(union dns_addr_u);
|
|
|
|
buflen -= sizeof(union dns_addr_u);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* And copy name */
|
|
|
|
|
2020-05-15 06:43:34 +02:00
|
|
|
DEBUGASSERT(buflen >= namelen + 1);
|
2020-03-31 20:21:04 +02:00
|
|
|
strncpy(ptr, name, buflen);
|
|
|
|
|
|
|
|
/* Set the address to h_name */
|
|
|
|
|
|
|
|
host->h_name = ptr;
|
|
|
|
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NETDB_DNSCLIENT */
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: lib_hostfile_lookup
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Try to look-up the host name from the network host file
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* name - The name of the host to find.
|
|
|
|
* host - Caller provided location to return the host data.
|
|
|
|
* buf - Caller provided buffer to hold string data associated with the
|
|
|
|
* host data.
|
|
|
|
* buflen - The size of the caller-provided buffer
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* Zero (0) is returned if the host file lookup was successful.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
#ifdef CONFIG_NETDB_HOSTFILE
|
|
|
|
static int lib_hostfile_lookup(FAR const char *name,
|
|
|
|
FAR struct hostent_s *host, FAR char *buf,
|
|
|
|
size_t buflen, FAR int *h_errnop)
|
|
|
|
{
|
|
|
|
FAR FILE *stream;
|
|
|
|
int herrnocode;
|
|
|
|
int nread;
|
|
|
|
|
|
|
|
/* Search the hosts file for a match */
|
|
|
|
|
|
|
|
stream = fopen(CONFIG_NETDB_HOSTCONF_PATH, "r");
|
|
|
|
if (stream == NULL)
|
|
|
|
{
|
|
|
|
int errcode = -errno;
|
|
|
|
|
|
|
|
nerr("ERROR: Failed to open the hosts file %s: %d\n",
|
|
|
|
CONFIG_NETDB_HOSTCONF_PATH, errcode);
|
|
|
|
UNUSED(errcode);
|
|
|
|
|
|
|
|
herrnocode = NO_RECOVERY;
|
|
|
|
goto errorout_with_herrnocode;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Loop reading entries from the hosts file until a match is found or
|
|
|
|
* until we hit the end-of-file.
|
|
|
|
*/
|
|
|
|
|
|
|
|
do
|
|
|
|
{
|
|
|
|
/* Read the next entry from the hosts file */
|
|
|
|
|
|
|
|
nread = parse_hostfile(stream, host, buf, buflen);
|
|
|
|
if (nread < 0)
|
|
|
|
{
|
|
|
|
/* Possible errors:
|
|
|
|
* ERANGE - Buffer not big enough
|
|
|
|
* ESPIPE - End of file (or possibly a read error).
|
|
|
|
* EAGAIN - Error parsing the line (E.g., missing hostname)
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (nread == -ESPIPE)
|
|
|
|
{
|
|
|
|
nread = 0;
|
|
|
|
}
|
|
|
|
else if (nread != -EAGAIN)
|
|
|
|
{
|
|
|
|
herrnocode = NO_RECOVERY;
|
|
|
|
goto errorout_with_stream;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else if (nread > 0)
|
|
|
|
{
|
|
|
|
/* We successfully read the entry */
|
|
|
|
|
|
|
|
ninfo("Comparing %s to %s\n", name, host->h_name);
|
|
|
|
|
|
|
|
/* Check for a host name match */
|
|
|
|
|
|
|
|
if (strcmp(name, host->h_name) == 0)
|
|
|
|
{
|
|
|
|
/* We have a match */
|
|
|
|
|
|
|
|
fclose(stream);
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* For a match with any host alias */
|
|
|
|
|
|
|
|
if (host->h_aliases != NULL)
|
|
|
|
{
|
|
|
|
FAR char **alias;
|
|
|
|
|
|
|
|
for (alias = host->h_aliases; *alias != NULL; alias++)
|
|
|
|
{
|
|
|
|
/* Check for a host alias match */
|
|
|
|
|
|
|
|
if (strcmp(name, *alias) == 0)
|
|
|
|
{
|
|
|
|
/* We have a match */
|
|
|
|
|
|
|
|
fclose(stream);
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
while (nread != 0);
|
|
|
|
|
|
|
|
/* We get here when the end of the hosts file is encountered without
|
|
|
|
* finding the hostname.
|
|
|
|
*/
|
|
|
|
|
|
|
|
herrnocode = HOST_NOT_FOUND;
|
|
|
|
|
|
|
|
errorout_with_stream:
|
|
|
|
fclose(stream);
|
|
|
|
|
|
|
|
errorout_with_herrnocode:
|
|
|
|
if (h_errnop)
|
|
|
|
{
|
|
|
|
*h_errnop = herrnocode;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ERROR;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NETDB_HOSTFILE */
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Public Functions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: gethostentbyname_r
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* The gethostentbyname_r() function returns a structure of type hostent_s
|
|
|
|
* for the given host name. Here name is either a hostname, or an IPv4
|
|
|
|
* address in standard dot notation (as for inet_addr(3)), or an IPv6
|
|
|
|
* address in colon (and possibly dot) notation.
|
|
|
|
*
|
|
|
|
* If name is an IPv4 or IPv6 address, no lookup is performed and
|
|
|
|
* gethostentbyname_r() simply copies name into the h_name field
|
|
|
|
* and its struct in_addr equivalent into the h_addr_list[0] field of the
|
|
|
|
* returned hostent structure.
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* name - The name of the host to find.
|
|
|
|
* host - Caller provided location to return the host data.
|
|
|
|
* buf - Caller provided buffer to hold string data associated with the
|
|
|
|
* host data.
|
|
|
|
* buflen - The size of the caller-provided buffer
|
|
|
|
* h_errnop - There h_errno value returned in the event of a failure.
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* Zero (OK) is returned on success, -1 (ERROR) is returned on a failure
|
|
|
|
* with the returned h_errno value provided the reason for the failure.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
int gethostentbyname_r(FAR const char *name,
|
|
|
|
FAR struct hostent_s *host, FAR char *buf,
|
|
|
|
size_t buflen, FAR int *h_errnop)
|
|
|
|
{
|
|
|
|
DEBUGASSERT(name != NULL && host != NULL && buf != NULL);
|
|
|
|
|
|
|
|
/* Make sure that the h_errno has a non-error code */
|
|
|
|
|
|
|
|
if (h_errnop)
|
|
|
|
{
|
|
|
|
*h_errnop = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check for a numeric hostname */
|
|
|
|
|
|
|
|
if (lib_numeric_address(name, host, buf, buflen) == 0)
|
|
|
|
{
|
|
|
|
/* Yes.. we are done */
|
|
|
|
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_LOOPBACK
|
|
|
|
/* Check for the local loopback host name */
|
|
|
|
|
|
|
|
if (lib_localhost(name, host, buf, buflen) == 0)
|
|
|
|
{
|
|
|
|
/* Yes.. we are done */
|
|
|
|
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Try to find the name in the HOSTALIASES environment variable */
|
|
|
|
|
|
|
|
#ifdef CONFIG_NETDB_DNSCLIENT
|
|
|
|
#if CONFIG_NETDB_DNSCLIENT_ENTRIES > 0
|
|
|
|
/* Check if we already have this hostname mapping cached */
|
|
|
|
|
|
|
|
if (lib_find_answer(name, host, buf, buflen) >= 0)
|
|
|
|
{
|
|
|
|
/* Found the address mapping in the cache */
|
|
|
|
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Try to get the host address using the DNS name server */
|
|
|
|
|
|
|
|
if (lib_dns_lookup(name, host, buf, buflen) >= 0)
|
|
|
|
{
|
|
|
|
/* Successful DNS lookup! */
|
|
|
|
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_NETDB_DNSCLIENT */
|
|
|
|
|
|
|
|
#ifdef CONFIG_NETDB_HOSTFILE
|
|
|
|
/* Search the hosts file for a match */
|
|
|
|
|
|
|
|
return lib_hostfile_lookup(name, host, buf, buflen, h_errnop);
|
|
|
|
|
|
|
|
#else
|
|
|
|
/* The host file file is not supported. The host name mapping was not
|
|
|
|
* found from any lookup heuristic
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (h_errnop)
|
|
|
|
{
|
|
|
|
*h_errnop = HOST_NOT_FOUND;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ERROR;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* CONFIG_LIBC_NETDB */
|