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/*
* Copyright (C) 2012 Patrick Plenefisch <phplenefisch@wpi.edu>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ipxe/resolv.h>
#include <ipxe/tcpip.h>
#include <ipxe/monojob.h>
#include <ipxe/settings.h>
#include <usr/nslookup.h>
/** @file
*
* Standalone name resolution
*
*/
/** A name resolution request */
struct nslookup {
/** Reference count for this object */
struct refcnt refcnt;
/** Job control interface */
struct interface job;
/** Data transfer interface */
struct interface resolver;
/** Setting name */
char *setting_name;
};
/**
* Terminate name resolution
*
* @v nslookup Name resolution request
* @v rc Reason for termination
*/
static void nslookup_close ( struct nslookup *nslookup, int rc ) {
/* Shut down interfaces */
intf_shutdown ( &nslookup->resolver, rc );
intf_shutdown ( &nslookup->job, rc );
}
/**
* Handle resolved name
*
* @v nslookup Name resolution request
* @v sa Completed socket address
*/
static void nslookup_resolv_done ( struct nslookup *nslookup,
struct sockaddr *sa ) {
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
const struct setting_type *default_type;
struct settings *settings;
struct setting setting;
void *data;
size_t len;
int rc;
/* Extract address */
switch ( sa->sa_family ) {
case AF_INET:
sin = ( ( struct sockaddr_in * ) sa );
data = &sin->sin_addr;
len = sizeof ( sin->sin_addr );
default_type = &setting_type_ipv4;
break;
case AF_INET6:
sin6 = ( ( struct sockaddr_in6 * ) sa );
data = &sin6->sin6_addr;
len = sizeof ( sin6->sin6_addr );
default_type = &setting_type_ipv6;
break;
default:
rc = -ENOTSUP;
goto err;
}
/* Parse specified setting name */
if ( ( rc = parse_setting_name ( nslookup->setting_name,
autovivify_child_settings, &settings,
&setting ) ) != 0 )
goto err;
/* Apply default type if necessary */
if ( ! setting.type )
setting.type = default_type;
/* Store in specified setting */
if ( ( rc = store_setting ( settings, &setting, data, len ) ) != 0 )
goto err;
err:
/* Terminate name resolution */
nslookup_close ( nslookup, rc );
}
/** Name resolution resolver interface operations */
static struct interface_operation nslookup_resolver_operations[] = {
INTF_OP ( resolv_done, struct nslookup *, nslookup_resolv_done ),
INTF_OP ( intf_close, struct nslookup *, nslookup_close ),
};
/** Name resolution resolver interface descriptor */
static struct interface_descriptor nslookup_resolver_desc =
INTF_DESC_PASSTHRU ( struct nslookup, resolver,
nslookup_resolver_operations, job );
/** Name resolution job control interface operations */
static struct interface_operation nslookup_job_operations[] = {
INTF_OP ( intf_close, struct nslookup *, nslookup_close ),
};
/** Name resolution job control interface descriptor */
static struct interface_descriptor nslookup_job_desc =
INTF_DESC_PASSTHRU ( struct nslookup, job,
nslookup_job_operations, resolver );
/**
* Initiate standalone name resolution
*
* @v job Parent interface
* @v name Name to resolve
* @v setting_name Setting name
* @ret rc Return status code
*/
static int resolv_setting ( struct interface *job, const char *name,
const char *setting_name ) {
struct nslookup *nslookup;
struct sockaddr sa;
char *setting_name_copy;
int rc;
/* Allocate and initialise structure */
nslookup = zalloc ( sizeof ( *nslookup ) + strlen ( setting_name )
+ 1 /* NUL */ );
if ( ! nslookup )
return -ENOMEM;
ref_init ( &nslookup->refcnt, NULL );
intf_init ( &nslookup->job, &nslookup_job_desc, &nslookup->refcnt );
intf_init ( &nslookup->resolver, &nslookup_resolver_desc,
&nslookup->refcnt );
setting_name_copy = ( ( void * ) ( nslookup + 1 ) );
strcpy ( setting_name_copy, setting_name );
nslookup->setting_name = setting_name_copy;
/* Start name resolution */
memset ( &sa, 0, sizeof ( sa ) );
if ( ( rc = resolv ( &nslookup->resolver, name, &sa ) ) != 0 )
goto err_resolv;
/* Attach parent interface, mortalise self, and return */
intf_plug_plug ( &nslookup->job, job );
ref_put ( &nslookup->refcnt );
return 0;
err_resolv:
ref_put ( &nslookup->refcnt );
return rc;
}
/**
* Perform (blocking) standalone name resolution
*
* @v name Name to resolve
* @v setting_name Setting name
* @ret rc Return status code
*/
int nslookup ( const char *name, const char *setting_name ) {
int rc;
/* Perform name resolution */
if ( ( rc = resolv_setting ( &monojob, name, setting_name ) ) == 0 )
rc = monojob_wait ( NULL, 0 );
if ( rc != 0 ) {
printf ( "Could not resolve %s: %s\n", name, strerror ( rc ) );
return rc;
}
return 0;
}
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