/* -*- Mode: C; tab-width: 4 -*-
*
* Copyright (c) 2012-2015 Apple Inc. All rights reserved.
*
* dnsctl.c
* Command-line tool using libdns_services.dylib
*
* To build only this tool, copy and paste the following on the command line:
* On Apple 64bit Platforms ONLY OSX/iOS:
* clang -Wall dnsctl.c /usr/lib/libdns_services.dylib -o dnsctl
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <net/if.h> // if_nametoindex()
#include "dns_services.h"
#include <xpc/xpc.h>
#include "dns_xpc.h"
//*************************************************************************************************************
// Globals:
//*************************************************************************************************************
static const char kFilePathSep = '/';
static DNSXConnRef ClientRef = NULL;
static xpc_connection_t dnsctl_conn = NULL;
//*************************************************************************************************************
// Utility Funcs:
//*************************************************************************************************************
static void printtimestamp(void)
{
struct tm tm;
int ms;
static char date[16];
static char new_date[16];
struct timeval tv;
gettimeofday(&tv, NULL);
localtime_r((time_t*)&tv.tv_sec, &tm);
ms = tv.tv_usec/1000;
strftime(new_date, sizeof(new_date), "%a %d %b %Y", &tm);
//display date only if it has changed
if (strncmp(date, new_date, sizeof(new_date)))
{
printf("DATE: ---%s---\n", new_date);
strlcpy(date, new_date, sizeof(date));
}
printf("%2d:%02d:%02d.%03d ", tm.tm_hour, tm.tm_min, tm.tm_sec, ms);
}
static void print_usage(const char *arg0)
{
fprintf(stderr, "%s USAGE: \n", arg0);
fprintf(stderr, "%s -DP Enable DNS Proxy with Default Parameters \n", arg0);
fprintf(stderr, "%s -DP [-o <output interface>] [-i <input interface(s)>] Enable DNS Proxy \n", arg0);
fprintf(stderr, "%s -L [1/2/3/4] Change mDNSResponder Logging Level \n", arg0);
fprintf(stderr, "%s -I Print mDNSResponder STATE INFO \n", arg0);
}
static bool DebugEnabled()
{
return true; // keep this true to debug the XPC msgs
}
static void DebugLog(const char *prefix, xpc_object_t o)
{
if (!DebugEnabled())
return;
char *desc = xpc_copy_description(o);
printf("%s: %s \n", prefix, desc);
free(desc);
}
//*************************************************************************************************************
// CallBack Funcs:
//*************************************************************************************************************
// DNSXEnableProxy Callback from the Daemon
static void dnsproxy_reply(DNSXConnRef connRef, DNSXErrorType errCode)
{
(void) connRef;
printtimestamp();
switch (errCode)
{
case kDNSX_NoError : printf(" SUCCESS \n");
break;
case kDNSX_DaemonNotRunning : printf(" NO DAEMON \n");
DNSXRefDeAlloc(ClientRef); break;
case kDNSX_BadParam : printf(" BAD PARAMETER \n");
DNSXRefDeAlloc(ClientRef); break;
case kDNSX_Busy : printf(" BUSY \n");
DNSXRefDeAlloc(ClientRef); break;
case kDNSX_UnknownErr :
default : printf(" UNKNOWN ERR \n");
DNSXRefDeAlloc(ClientRef); break;
}
fflush(NULL);
}
//*************************************************************************************************************
// XPC Funcs:
//*************************************************************************************************************
static void Init_Connection(const char *servname)
{
dnsctl_conn = xpc_connection_create_mach_service(servname, dispatch_get_main_queue(), XPC_CONNECTION_MACH_SERVICE_PRIVILEGED);
xpc_connection_set_event_handler(dnsctl_conn, ^(xpc_object_t event)
{
printf("InitConnection: [%s] \n", xpc_dictionary_get_string(event, XPC_ERROR_KEY_DESCRIPTION));
});
xpc_connection_resume(dnsctl_conn);
}
static void SendDictToServer(xpc_object_t msg)
{
DebugLog("SendDictToServer Sending msg to Daemon", msg);
xpc_connection_send_message_with_reply(dnsctl_conn, msg, dispatch_get_main_queue(), ^(xpc_object_t recv_msg)
{
xpc_type_t type = xpc_get_type(recv_msg);
if (type == XPC_TYPE_DICTIONARY)
{
DebugLog("SendDictToServer Received reply msg from Daemon", recv_msg);
/*
// If we ever want to do something based on the reply of the daemon
switch (daemon_status)
{
default:
break;
}
*/
}
else
{
printf("SendDictToServer Received unexpected reply from daemon [%s]",
xpc_dictionary_get_string(recv_msg, XPC_ERROR_KEY_DESCRIPTION));
DebugLog("SendDictToServer Unexpected Reply contents", recv_msg);
}
exit(1);
});
}
//*************************************************************************************************************
int main(int argc, char **argv)
{
// Extract program name from argv[0], which by convention contains the path to this executable
const char *a0 = strrchr(argv[0], kFilePathSep) + 1;
if (a0 == (const char *)1)
a0 = argv[0];
// Must run as root
if (0 != geteuid())
{
fprintf(stderr, "%s MUST run as root!!\n", a0);
exit(-1);
}
if ((sizeof(argv) == 8))
printf("dnsctl running in 64-bit mode\n");
else if ((sizeof(argv) == 4))
printf("dnsctl running in 32-bit mode\n");
// expects atleast one argument
if (argc < 2)
goto Usage;
printtimestamp();
if (!strcasecmp(argv[1], "-DP"))
{
DNSXErrorType err;
// Default i/p intf is lo0 and o/p intf is primary interface
IfIndex Ipintfs[MaxInputIf] = {1, 0, 0, 0, 0};
IfIndex Opintf = kDNSIfindexAny;
if (argc == 2)
{
dispatch_queue_t my_Q = dispatch_queue_create("com.apple.dnsctl.callback_queue", NULL);
err = DNSXEnableProxy(&ClientRef, kDNSProxyEnable, Ipintfs, Opintf, my_Q, dnsproxy_reply);
if (err)
fprintf(stderr, "DNSXEnableProxy returned %d\n", err);
}
else if (argc > 2)
{
argc--;
argv++;
if (!strcmp(argv[1], "-o"))
{
Opintf = if_nametoindex(argv[2]);
if (!Opintf)
Opintf = atoi(argv[2]);
if (!Opintf)
{
fprintf(stderr, "Could not parse o/p interface [%s]: Passing default primary \n", argv[2]);
Opintf = kDNSIfindexAny;
}
argc -= 2;
argv += 2;
}
if (argc > 2 && !strcmp(argv[1], "-i"))
{
int i;
argc--;
argv++;
for (i = 0; i < MaxInputIf && argc > 1; i++)
{
Ipintfs[i] = if_nametoindex(argv[1]);
if (!Ipintfs[i])
Ipintfs[i] = atoi(argv[1]);
if (!Ipintfs[i])
{
fprintf(stderr, "Could not parse i/p interface [%s]: Passing default lo0 \n", argv[2]);
Ipintfs[i] = 1;
}
argc--;
argv++;
}
}
printf("Enabling DNSProxy on mDNSResponder \n");
dispatch_queue_t my_Q = dispatch_queue_create("com.apple.dnsctl.callback_queue", NULL);
err = DNSXEnableProxy(&ClientRef, kDNSProxyEnable, Ipintfs, Opintf, my_Q, dnsproxy_reply);
if (err)
fprintf(stderr, "DNSXEnableProxy returned %d\n", err);
}
}
else if (!strcasecmp(argv[1], "-l"))
{
printf("Changing loglevel of mDNSResponder \n");
Init_Connection(kDNSCTLService);
// Create Dictionary To Send
xpc_object_t dict = xpc_dictionary_create(NULL, NULL, 0);
if (argc == 2)
{
xpc_dictionary_set_uint64(dict, kDNSLogLevel, log_level1);
SendDictToServer(dict);
xpc_release(dict);
dict = NULL;
}
else if (argc > 2)
{
argc--;
argv++;
switch (atoi(argv[1]))
{
case log_level1:
xpc_dictionary_set_uint64(dict, kDNSLogLevel, log_level1);
break;
case log_level2:
xpc_dictionary_set_uint64(dict, kDNSLogLevel, log_level2);
break;
case log_level3:
xpc_dictionary_set_uint64(dict, kDNSLogLevel, log_level3);
break;
case log_level4:
xpc_dictionary_set_uint64(dict, kDNSLogLevel, log_level4);
break;
default:
xpc_dictionary_set_uint64(dict, kDNSLogLevel, log_level1);
break;
}
SendDictToServer(dict);
xpc_release(dict);
dict = NULL;
}
}
else if(!strcasecmp(argv[1], "-i"))
{
printf("Get STATE INFO of mDNSResponder \n");
Init_Connection(kDNSCTLService);
// Create Dictionary To Send
xpc_object_t dict = xpc_dictionary_create(NULL, NULL, 0);
xpc_dictionary_set_uint64(dict, kDNSStateInfo, full_state);
SendDictToServer(dict);
xpc_release(dict);
dict = NULL;
}
else if(!strcasecmp(argv[1], "-th"))
{
printf("Sending Test message to mDNSResponder to forward to mDNSResponderHelper\n");
Init_Connection(kDNSCTLService);
// Create Dictionary To Send
xpc_object_t dict = xpc_dictionary_create(NULL, NULL, 0);
xpc_dictionary_set_uint64(dict, kmDNSResponderTests, test_helper_ipc);
SendDictToServer(dict);
xpc_release(dict);
dict = NULL;
}
else if(!strcasecmp(argv[1], "-tl"))
{
printf("Testing mDNSResponder Logging\n");
Init_Connection(kDNSCTLService);
// Create Dictionary To Send
xpc_object_t dict = xpc_dictionary_create(NULL, NULL, 0);
xpc_dictionary_set_uint64(dict, kmDNSResponderTests, test_mDNS_log);
SendDictToServer(dict);
xpc_release(dict);
dict = NULL;
}
else
{
goto Usage;
}
dispatch_main();
Usage:
print_usage(a0);
return 0;
}
/*
#include <getopt.h>
static int operation;
static int getfirstoption(int argc, char **argv, const char *optstr, int *pOptInd)
{
// Return the recognized option in optstr and the option index of the next arg.
int o = getopt(argc, (char *const *)argv, optstr);
*pOptInd = optind;
return o;
}
int opindex;
operation = getfirstoption(argc, argv, "lLDdPp", &opindex);
if (operation == -1)
goto Usage;
switch (operation)
{
case 'L':
case 'l':
{
printtimestamp();
printf("Change Verbosity Level of mDNSResponder\n");
Init_Connection(kDNSCTLService);
// Create Dictionary To Send
xpc_object_t dict = xpc_dictionary_create(NULL, NULL, 0);
if (dict == NULL)
printf("could not create the Msg Dict To Send! \n");
xpc_dictionary_set_uint64(dict, kDNSLogLevel, log_level2);
SendDictToServer(dict);
xpc_release(dict);
dict = NULL;
break;
}
// exit(1);
}
*/