93 lines
3.7 KiB
C
93 lines
3.7 KiB
C
/****************************************************************************
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* libc/netdb/lib_gethostbyaddr.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <netdb.h>
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#include <errno.h>
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#include "libc.h"
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#include "netdb/lib_netdb.h"
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#ifdef CONFIG_NETDB_HOSTFILE
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: gethostbyaddr
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*
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* Description:
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* The gethostbyaddr() function returns a structure of type hostent for
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* the given host address addr of length len and address type type. Valid
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* address types are AF_INET and AF_INET6. The host address argument is a
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* pointer to a struct of a type depending on the address type, for example
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* a struct in_addr * for address type AF_INET.
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*
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* Input Parameters:
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* addr - The address of the host to find.
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* len - The length of the address
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* type - The type of the address
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*
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* Returned Value:
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* Upon successful completion, this function will return a pointer to a
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* hostent structure if the requested entry was found, and a null pointer
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* if the end of the database was reached or the requested entry was not
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* found.
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*
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* Upon unsuccessful completion, gethostbyaddr() will set h_errno to
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* indicate the error
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*
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****************************************************************************/
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FAR struct hostent *gethostbyaddr(FAR const void *addr, socklen_t len, int type)
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{
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int ret;
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DEBUGASSERT(addr != NULL);
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DEBUGASSERT(type == AF_INET || type == AF_INET6);
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ret = gethostbyaddr_r(addr, len, type, &g_hostent, g_hostbuffer,
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CONFIG_NETDB_BUFSIZE, &h_errno);
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return ret == 0 ? &g_hostent : NULL;
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}
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#endif /* CONFIG_NETDB_HOSTFILE */
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