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/*
This file is part of GNUnet.
Copyright (C) 2012 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "nss_gns_query.h"
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
/**
* Wrapper function that uses gnunet-gns cli tool to resolve
* an IPv4/6 address.
*
* @param af address family
* @param name the name to resolve
* @param u the userdata (result struct)
* @return -1 on error else 0
*/
int
gns_resolve_name (int af,
const char *name,
struct userdata *u)
{
FILE *p;
char *cmd;
char line[128];
int ret;
if (AF_INET6 == af)
{
if (-1 == asprintf (&cmd,
"%s -t AAAA -u %s\n",
"gnunet-gns -r",
name))
return -1;
}
else
{
if (-1 == asprintf (&cmd,
"%s %s\n",
"gnunet-gns -r -u",
name))
return -1;
}
if (NULL == (p = popen (cmd, "r")))
{
free (cmd);
return -1;
}
while (NULL != fgets (line,
sizeof(line),
p))
{
if (u->count >= MAX_ENTRIES)
break;
if (line[strlen(line)-1] == '\n')
{
line[strlen(line)-1] = '\0';
if (AF_INET == af)
{
if (inet_pton(af,
line,
&u->data.ipv4[u->count]))
{
u->count++;
u->data_len += sizeof(ipv4_address_t);
}
else
{
pclose (p);
free (cmd);
return -1;
}
}
else if (AF_INET6 == af)
{
if (inet_pton(af,
line,
&u->data.ipv6[u->count]))
{
u->count++;
u->data_len += sizeof(ipv6_address_t);
}
else
{
pclose (p);
free (cmd);
return -1;
}
}
}
}
ret = pclose (p);
free (cmd);
if (4 == ret)
return -2; /* not for GNS */
if (3 == ret)
return -3; /* timeout -> not found */
if ( (2 == ret) || (1 == ret) )
return -2; /* launch failure -> service unavailable */
return 0;
}
/* end of nss_gns_query.c */
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