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/*
* Copyright (C) 2013 Martin Willi
* Copyright (C) 2013 revosec AG
*
* 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 (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "osx_attr_handler.h"
#include <networking/host.h>
#include <utils/debug.h>
#include <SystemConfiguration/SCDynamicStore.h>
typedef struct private_osx_attr_handler_t private_osx_attr_handler_t;
/**
* Private data of an osx_attr_handler_t object.
*/
struct private_osx_attr_handler_t {
/**
* Public interface
*/
osx_attr_handler_t public;
};
/**
* Create a path to the DNS configuration of the Primary IPv4 Service
*/
static CFStringRef create_dns_path(SCDynamicStoreRef store)
{
CFStringRef service, path = NULL;
CFDictionaryRef dict;
/* get primary service */
dict = SCDynamicStoreCopyValue(store, CFSTR("State:/Network/Global/IPv4"));
if (dict)
{
service = CFDictionaryGetValue(dict, CFSTR("PrimaryService"));
if (service)
{
path = CFStringCreateWithFormat(NULL, NULL,
CFSTR("State:/Network/Service/%@/DNS"), service);
}
else
{
DBG1(DBG_CFG, "SystemConfiguration PrimaryService not known");
}
CFRelease(dict);
}
else
{
DBG1(DBG_CFG, "getting global IPv4 SystemConfiguration failed");
}
return path;
}
/**
* Create a mutable dictionary from path, a new one if not found
*/
static CFMutableDictionaryRef get_dictionary(SCDynamicStoreRef store,
CFStringRef path)
{
CFDictionaryRef dict;
CFMutableDictionaryRef mut = NULL;
dict = SCDynamicStoreCopyValue(store, path);
if (dict)
{
if (CFGetTypeID(dict) == CFDictionaryGetTypeID())
{
mut = CFDictionaryCreateMutableCopy(NULL, 0, dict);
}
CFRelease(dict);
}
if (!mut)
{
mut = CFDictionaryCreateMutable(NULL, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
}
return mut;
}
/**
* Create a mutable array from dictionary path, a new one if not found
*/
static CFMutableArrayRef get_array_from_dict(CFDictionaryRef dict,
CFStringRef name)
{
CFArrayRef arr;
arr = CFDictionaryGetValue(dict, name);
if (arr && CFGetTypeID(arr) == CFArrayGetTypeID())
{
return CFArrayCreateMutableCopy(NULL, 0, arr);
}
return CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
}
/**
* Add/Remove a DNS server to the configuration
*/
static bool manage_dns(int family, chunk_t data, bool add)
{
SCDynamicStoreRef store;
CFStringRef path, dns;
CFMutableArrayRef arr;
CFMutableDictionaryRef dict;
CFIndex i;
host_t *server;
char buf[64];
bool success = FALSE;
server = host_create_from_chunk(family, data, 0);
if (!server)
{
return FALSE;
}
snprintf(buf, sizeof(buf), "%H", server);
server->destroy(server);
store = SCDynamicStoreCreate(NULL, CFSTR("osx-attr"), NULL, NULL);
path = create_dns_path(store);
if (path)
{
dict = get_dictionary(store, path);
arr = get_array_from_dict(dict, CFSTR("ServerAddresses"));
dns = CFStringCreateWithCString(NULL, buf, kCFStringEncodingUTF8);
if (add)
{
DBG1(DBG_CFG, "installing %s as DNS server", buf);
CFArrayInsertValueAtIndex(arr, 0, dns);
}
else
{
i = CFArrayGetFirstIndexOfValue(arr,
CFRangeMake(0, CFArrayGetCount(arr)), dns);
if (i >= 0)
{
DBG1(DBG_CFG, "removing %s from DNS servers (%d)", buf, i);
CFArrayRemoveValueAtIndex(arr, i);
}
}
CFRelease(dns);
CFDictionarySetValue(dict, CFSTR("ServerAddresses"), arr);
CFRelease(arr);
success = SCDynamicStoreSetValue(store, path, dict);
CFRelease(dict);
CFRelease(path);
}
CFRelease(store);
if (!success)
{
DBG1(DBG_CFG, "adding DNS server to SystemConfiguration failed");
}
return success;
}
METHOD(attribute_handler_t, handle, bool,
private_osx_attr_handler_t *this, identification_t *id,
configuration_attribute_type_t type, chunk_t data)
{
switch (type)
{
case INTERNAL_IP4_DNS:
return manage_dns(AF_INET, data, TRUE);
default:
return FALSE;
}
}
METHOD(attribute_handler_t, release, void,
private_osx_attr_handler_t *this, identification_t *server,
configuration_attribute_type_t type, chunk_t data)
{
switch (type)
{
case INTERNAL_IP4_DNS:
manage_dns(AF_INET, data, FALSE);
break;
default:
break;
}
}
METHOD(enumerator_t, enumerate_dns, bool,
enumerator_t *this, configuration_attribute_type_t *type, chunk_t *data)
{
*type = INTERNAL_IP4_DNS;
*data = chunk_empty;
/* stop enumeration */
this->enumerate = (void*)return_false;
return TRUE;
}
METHOD(attribute_handler_t, create_attribute_enumerator, enumerator_t *,
private_osx_attr_handler_t *this, identification_t *id,
linked_list_t *vips)
{
enumerator_t *enumerator;
INIT(enumerator,
.enumerate = (void*)_enumerate_dns,
.destroy = (void*)free,
);
return enumerator;
}
METHOD(osx_attr_handler_t, destroy, void,
private_osx_attr_handler_t *this)
{
free(this);
}
/**
* See header
*/
osx_attr_handler_t *osx_attr_handler_create()
{
private_osx_attr_handler_t *this;
INIT(this,
.public = {
.handler = {
.handle = _handle,
.release = _release,
.create_attribute_enumerator = _create_attribute_enumerator,
},
.destroy = _destroy,
},
);
return &this->public;
}
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