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83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/* Convert a struct hostent object to a string.
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Copyright (C) 2016-2020 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
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License as published by the Free Software Foundation; either
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version 2.1 of the 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; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/format_nss.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <support/support.h>
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#include <support/xmemstream.h>
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static int
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address_length (int family)
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{
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switch (family)
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{
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case AF_INET:
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return 4;
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case AF_INET6:
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return 16;
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}
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return -1;
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}
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char *
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support_format_hostent (struct hostent *h)
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{
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if (h == NULL)
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{
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if (h_errno == NETDB_INTERNAL)
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return xasprintf ("error: NETDB_INTERNAL (errno %d, %m)\n", errno);
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else
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{
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char *value = support_format_herrno (h_errno);
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char *result = xasprintf ("error: %s\n", value);
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free (value);
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return result;
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}
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}
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struct xmemstream mem;
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xopen_memstream (&mem);
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fprintf (mem.out, "name: %s\n", h->h_name);
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for (char **alias = h->h_aliases; *alias != NULL; ++alias)
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fprintf (mem.out, "alias: %s\n", *alias);
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for (unsigned i = 0; h->h_addr_list[i] != NULL; ++i)
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{
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char buf[128];
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if (inet_ntop (h->h_addrtype, h->h_addr_list[i],
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buf, sizeof (buf)) == NULL)
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fprintf (mem.out, "error: inet_ntop failed: %m\n");
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else
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fprintf (mem.out, "address: %s\n", buf);
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}
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if (h->h_length != address_length (h->h_addrtype))
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{
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char *family = support_format_address_family (h->h_addrtype);
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fprintf (mem.out, "error: invalid address length %d for %s\n",
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h->h_length, family);
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free (family);
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}
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xfclose_memstream (&mem);
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return mem.buffer;
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}
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