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74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/* IPv4-only variant of gethostbyname.
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Copyright (C) 2016-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <netdb.h>
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#include <rpc/rpc.h>
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#include <scratch_buffer.h>
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#include <string.h>
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int
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__libc_rpc_gethostbyname (const char *host, struct sockaddr_in *addr)
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{
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struct hostent hostbuf;
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struct hostent *hp = NULL;
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int herr;
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struct scratch_buffer tmpbuf;
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scratch_buffer_init (&tmpbuf);
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while (__gethostbyname2_r (host, AF_INET,
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&hostbuf, tmpbuf.data, tmpbuf.length, &hp,
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&herr) != 0
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|| hp == NULL)
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if (herr != NETDB_INTERNAL || errno != ERANGE)
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{
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struct rpc_createerr *ce = &get_rpc_createerr ();
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ce->cf_stat = RPC_UNKNOWNHOST;
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scratch_buffer_free (&tmpbuf);
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return -1;
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}
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else
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{
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if (!scratch_buffer_grow (&tmpbuf))
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{
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/* If memory allocation failed, allocating the RPC error
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structure might could as well, so this could lead to a
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crash. */
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struct rpc_createerr *ce = &get_rpc_createerr ();
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ce->cf_stat = RPC_SYSTEMERROR;
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ce->cf_error.re_errno = ENOMEM;
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return -1;
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}
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}
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if (hp->h_addrtype != AF_INET || hp->h_length != sizeof (addr->sin_addr))
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{
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struct rpc_createerr *ce = &get_rpc_createerr ();
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ce->cf_stat = RPC_SYSTEMERROR;
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ce->cf_error.re_errno = EAFNOSUPPORT;
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scratch_buffer_free (&tmpbuf);
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return -1;
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}
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addr->sin_family = AF_INET;
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addr->sin_port = htons (0);
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memcpy (&addr->sin_addr, hp->h_addr, sizeof (addr->sin_addr));
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scratch_buffer_free (&tmpbuf);
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return 0;
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}
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