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/* -*- Mode: C; tab-width: 4 -*-
*
* Copyright (c) 2013, 2015 Apple Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mDNSMacOSX.h"
#include <libproc.h>
#include <network/private.h>
#include "dns_sd_internal.h"
//Gets the DNSPolicy from NW PATH EVALUATOR
mDNSexport void mDNSPlatformGetDNSRoutePolicy(DNSQuestion *q, mDNSBool *isBlocked)
{
q->ServiceID = -1; // initialize the ServiceID to default value of -1
// Return for non-unicast DNS queries, invalid pid, if NWPathEvaluation is already done by the client, or NWPathEvaluation not available on this OS
if (mDNSOpaque16IsZero(q->TargetQID) || (q->pid < 0) || (q->flags & kDNSServiceFlagsPathEvaluationDone) || !nw_endpoint_create_host)
{
*isBlocked = mDNSfalse;
return;
}
mDNSs32 service_id;
mDNSu32 client_ifindex, dnspol_ifindex;
int retval;
struct proc_uniqidentifierinfo info;
mDNSBool isUUIDSet;
char unenc_name[MAX_ESCAPED_DOMAIN_NAME];
ConvertDomainNameToCString(&q->qname, unenc_name);
nw_endpoint_t host = nw_endpoint_create_host(unenc_name, "0");
if (host == NULL)
LogMsg("mDNSPlatformGetDNSRoutePolicy: DNS Route Policy: Query for %##s (%s), PID[%d], EUID[%d], ServiceID[%d] nw_endpoint_t host is NULL", q->qname.c,
DNSTypeName(q->qtype), q->pid, q->euid, q->ServiceID);
nw_parameters_t parameters = nw_parameters_create();
if (parameters == NULL)
LogMsg("mDNSPlatformGetDNSRoutePolicy: DNS Route Policy: Query for %##s (%s), PID[%d], EUID[%d], ServiceID[%d] nw_endpoint_t parameters is NULL", q->qname.c,
DNSTypeName(q->qtype), q->pid, q->euid, q->ServiceID);
// Check for all the special (negative) internal value interface indices before initializing client_ifindex
if ( (q->InterfaceID == mDNSInterface_Any)
|| (q->InterfaceID == mDNSInterface_Unicast)
|| (q->InterfaceID == mDNSInterface_LocalOnly)
|| (q->InterfaceID == mDNSInterfaceMark)
|| (q->InterfaceID == mDNSInterface_P2P)
|| (q->InterfaceID == mDNSInterface_BLE)
|| (q->InterfaceID == uDNSInterfaceMark))
{
client_ifindex = 0;
}
else
{
client_ifindex = (mDNSu32)(uintptr_t)q->InterfaceID;
}
if (client_ifindex > 0)
{
nw_interface_t client_intf = nw_interface_create_with_index(client_ifindex);
nw_parameters_require_interface(parameters, client_intf);
if (client_intf != NULL)
network_release(client_intf);
else
LogInfo("mDNSPlatformGetDNSRoutePolicy: DNS Route Policy: client_intf returned by nw_interface_create_with_index() is NULL");
}
nw_parameters_set_uid(parameters,(uid_t)q->euid);
if (q->pid != 0)
{
nw_parameters_set_pid(parameters, q->pid);
retval = proc_pidinfo(q->pid, PROC_PIDUNIQIDENTIFIERINFO, 1, &info, sizeof(info));
if (retval == (int)sizeof(info))
{
nw_parameters_set_e_proc_uuid(parameters, info.p_uuid);
isUUIDSet = mDNStrue;
}
else
{
debugf("mDNSPlatformGetDNSRoutePolicy: proc_pidinfo returned %d", retval);
isUUIDSet = mDNSfalse;
}
}
else
{
nw_parameters_set_e_proc_uuid(parameters, q->uuid);
isUUIDSet = mDNStrue;
}
nw_path_evaluator_t evaluator = nw_path_create_evaluator_for_endpoint(host, parameters);
if (evaluator == NULL)
LogMsg("mDNSPlatformGetDNSRoutePolicy: DNS Route Policy: Query for %##s (%s), PID[%d], EUID[%d], ServiceID[%d] nw_path_evaluator_t evaluator is NULL", q->qname.c,
DNSTypeName(q->qtype), q->pid, q->euid, q->ServiceID);
if (host != NULL)
network_release(host);
if (parameters != NULL)
network_release(parameters);
nw_path_t path = nw_path_evaluator_copy_path(evaluator);
if (path == NULL)
LogMsg("mDNSPlatformGetDNSRoutePolicy: DNS Route Policy: Query for %##s (%s), PID[%d], EUID[%d], ServiceID[%d] nw_path_t path is NULL", q->qname.c,
DNSTypeName(q->qtype), q->pid, q->euid, q->ServiceID);
service_id = nw_path_get_flow_divert_unit(path);
if (service_id != 0)
{
q->ServiceID = service_id;
LogInfo("mDNSPlatformGetDNSRoutePolicy: DNS Route Policy: Query for %##s service ID is set ->service_ID:[%d] ", q->qname.c, service_id);
}
else
{
nw_interface_t nwpath_intf = nw_path_copy_scoped_interface(path);
if (nwpath_intf != NULL)
{
// Use the new scoped interface given by NW PATH EVALUATOR
dnspol_ifindex = nw_interface_get_index(nwpath_intf);
q->InterfaceID = (mDNSInterfaceID)(uintptr_t)dnspol_ifindex;
network_release(nwpath_intf);
if (dnspol_ifindex != client_ifindex)
LogInfo("mDNSPlatformGetDNSRoutePolicy: DNS Route Policy has changed the scoped ifindex from [%d] to [%d]",
client_ifindex, dnspol_ifindex);
}
else
{
debugf("mDNSPlatformGetDNSRoutePolicy: Query for %##s (%s), PID[%d], EUID[%d], ServiceID[%d] nw_interface_t nwpath_intf is NULL ", q->qname.c, DNSTypeName(q->qtype), q->pid, q->euid, q->ServiceID);
}
}
if (isUUIDSet && (nw_path_get_status(path) == nw_path_status_unsatisfied) && (nw_path_get_reason(path) == nw_path_reason_policy_drop))
*isBlocked = mDNStrue;
else
*isBlocked = mDNSfalse;
if (path != NULL)
network_release(path);
if (evaluator != NULL)
network_release(evaluator);
}
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