| /* Convert a struct hostent object to a string. |
| Copyright (C) 2016-2018 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; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <support/format_nss.h> |
| |
| #include <arpa/inet.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <support/support.h> |
| #include <support/xmemstream.h> |
| |
| static int |
| address_length (int family) |
| { |
| switch (family) |
| { |
| case AF_INET: |
| return 4; |
| case AF_INET6: |
| return 16; |
| } |
| return -1; |
| } |
| |
| char * |
| support_format_hostent (struct hostent *h) |
| { |
| if (h == NULL) |
| { |
| if (h_errno == NETDB_INTERNAL) |
| return xasprintf ("error: NETDB_INTERNAL (errno %d, %m)\n", errno); |
| else |
| { |
| char *value = support_format_herrno (h_errno); |
| char *result = xasprintf ("error: %s\n", value); |
| free (value); |
| return result; |
| } |
| } |
| |
| struct xmemstream mem; |
| xopen_memstream (&mem); |
| |
| fprintf (mem.out, "name: %s\n", h->h_name); |
| for (char **alias = h->h_aliases; *alias != NULL; ++alias) |
| fprintf (mem.out, "alias: %s\n", *alias); |
| for (unsigned i = 0; h->h_addr_list[i] != NULL; ++i) |
| { |
| char buf[128]; |
| if (inet_ntop (h->h_addrtype, h->h_addr_list[i], |
| buf, sizeof (buf)) == NULL) |
| fprintf (mem.out, "error: inet_ntop failed: %m\n"); |
| else |
| fprintf (mem.out, "address: %s\n", buf); |
| } |
| if (h->h_length != address_length (h->h_addrtype)) |
| { |
| char *family = support_format_address_family (h->h_addrtype); |
| fprintf (mem.out, "error: invalid address length %d for %s\n", |
| h->h_length, family); |
| free (family); |
| } |
| |
| xfclose_memstream (&mem); |
| return mem.buffer; |
| } |