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/* IPv4-only variant of gethostbyname.
Copyright (C) 2016-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <netdb.h>
#include <rpc/rpc.h>
#include <scratch_buffer.h>
#include <string.h>
int
__libc_rpc_gethostbyname (const char *host, struct sockaddr_in *addr)
{
struct hostent hostbuf;
struct hostent *hp = NULL;
int herr;
struct scratch_buffer tmpbuf;
scratch_buffer_init (&tmpbuf);
while (__gethostbyname2_r (host, AF_INET,
&hostbuf, tmpbuf.data, tmpbuf.length, &hp,
&herr) != 0
|| hp == NULL)
if (herr != NETDB_INTERNAL || errno != ERANGE)
{
struct rpc_createerr *ce = &get_rpc_createerr ();
ce->cf_stat = RPC_UNKNOWNHOST;
scratch_buffer_free (&tmpbuf);
return -1;
}
else
{
if (!scratch_buffer_grow (&tmpbuf))
{
/* If memory allocation failed, allocating the RPC error
structure might could as well, so this could lead to a
crash. */
struct rpc_createerr *ce = &get_rpc_createerr ();
ce->cf_stat = RPC_SYSTEMERROR;
ce->cf_error.re_errno = ENOMEM;
return -1;
}
}
if (hp->h_addrtype != AF_INET || hp->h_length != sizeof (addr->sin_addr))
{
struct rpc_createerr *ce = &get_rpc_createerr ();
ce->cf_stat = RPC_SYSTEMERROR;
ce->cf_error.re_errno = EAFNOSUPPORT;
scratch_buffer_free (&tmpbuf);
return -1;
}
addr->sin_family = AF_INET;
addr->sin_port = htons (0);
memcpy (&addr->sin_addr, hp->h_addr, sizeof (addr->sin_addr));
scratch_buffer_free (&tmpbuf);
return 0;
}
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