I just like to ask if it is possible to identify the IP Address of a device (e.g. a printer) using its Hostname even if its Bonjour setting is turned off? Also can you give me an example on how to do it? I am developing an app in iOS that should handle this scenario.
I have looked at the following:
getaddrinfo
CFHostStartInfoResolution
but they work only if the device's bonjour is turned ON.
Assuming the hostname (let's say nameOfTheDevice) is registered with the zone's authoritative DNS server, you can use CFHost to look up an address or hostname. For example:
NSString* hostname = #"nameOfTheDevice";
CFHostRef hostRef = CFHostCreateWithName(kCFAllocatorDefault, (CFStringRef)hostname);
Boolean lookup = CFHostStartInfoResolution(hostRef, kCFHostAddresses, NULL);
NSArray* addresses = (NSArray*)CFHostGetAddressing(hostRef, &lookup);
[addresses enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSString *strDNS = [NSString stringWithUTF8String:inet_ntoa(*((struct in_addr *)obj))];
NSLog(#"Resolved %d->%#", idx, strDNS);
}];
(Remember to put error checks in your production code). Bear in mind that if the DNS server isn't aware of that hostname, there's nothing you can do. It's not safe to assume that you'll be able to perform a successful lookup, especially on a home network where built-in DHCP/DNS servers have widely varying capabilities.
From previous answer get callback func and pass obj as a parameter into this function
void printAddr(CFDataRef address)
{
NSString *addressString;
struct sockaddr *addressGeneric;
NSData *myData = (__bridge NSData*)address;
addressGeneric = (struct sockaddr*)[myData bytes];
switch(addressGeneric->sa_family) {
case AF_INET: {
struct sockaddr_in *ip4;
char dest[INET_ADDRSTRLEN];
ip4 = (struct sockaddr_in *) [myData bytes];
addressString = [NSString stringWithFormat: #"IP4: %s", inet_ntop(AF_INET, &ip4->sin_addr, dest, sizeof dest)];
}
break;
case AF_INET6: {
struct sockaddr_in6 *ip6;
char dest[INET6_ADDRSTRLEN];
ip6 = (struct sockaddr_in6 *) [myData bytes];
addressString = [NSString stringWithFormat: #"IP6: %s", inet_ntop(AF_INET6, &ip6->sin6_addr, dest, sizeof dest)];
}
break;
}
NSLog(#"%#", addressString);
}
Related
When I get a NetService object，I try to do：
NSNetService *ss=[netArray objectAtIndex:indexPath.row];
ss.delegate=self;
[ss resolveWithTimeout:3.0];
On the delegate method：
-(void)netServiceDidResolveAddress:(NSNetService *)sender
{
NSArray *address=sender.addresses;
NSData *addressData=[NSData dataWithBytes:address length:sizeof(address)];
/*
How?
*/
}
Thanks.
// Sent when addresses are resolved
- (void)netServiceDidResolveAddress:(NSNetService *)netService
{
// Make sure [netService addresses] contains the
// necessary connection information
if ([self addressesComplete:[netService addresses]
forServiceType:[netService type]]) {
[services addObject:netService];
}
}
// Verifies [netService addresses]
- (BOOL)addressesComplete:(NSArray *)addresses
forServiceType:(NSString *)serviceType
{
// Perform appropriate logic to ensure that [netService addresses]
// contains the appropriate information to connect to the service
NSData *myData = nil;
myData = [addresses objectAtIndex:0];
NSString *addressString;
int port=0;
struct sockaddr *addressGeneric;
struct sockaddr_in addressClient;
addressGeneric = (struct sockaddr *) [myData bytes];
switch( addressGeneric->sa_family ) {
case AF_INET: {
struct sockaddr_in *ip4;
char dest[INET_ADDRSTRLEN];
ip4 = (struct sockaddr_in *) [myData bytes];
port = ntohs(ip4->sin_port);
addressString = [NSString stringWithFormat: #"IP4: %s Port: %d", inet_ntop(AF_INET, &ip4->sin_addr, dest, sizeof dest),port];
}
break;
case AF_INET6: {
struct sockaddr_in6 *ip6;
char dest[INET6_ADDRSTRLEN];
ip6 = (struct sockaddr_in6 *) [myData bytes];
port = ntohs(ip6->sin6_port);
addressString = [NSString stringWithFormat: #"IP6: %s Port: %d", inet_ntop(AF_INET6, &ip6->sin6_addr, dest, sizeof dest),port];
}
break;
default:
addressString=#"Unknown family";
break;
}
NSLog(#"Client Address: %#",addressString);
return YES;
}
This is the output
Client Address: IP4: 192.168.69.38 Port: 58612
I found a post which suggests the following solution.
NSString* addressString = [[NSString alloc] initWithData:addressData encoding:NSASCIIStringEncoding];
Though it does not output a human readable string for me... It might work for you.
This is what is written to the console when I print the NSData object.
<10026a5e 0a0a7893 00000000 00000000>
Meanwhile, I found out that the second segment is the hexadecimal form of the ip-address. In this example it is ...
10.10.120.147 // 0a0a7893
I have written a Host class that does the conversion. The NSString extension can be found here. I only use the first 16-bytes address and ignore all others. Feel free to extend the class.
I looked for some code that will help me to get the ip that the iPhone connect with.
I find this one:
- (NSString *)getIPAddress
{
NSString *address = #"error";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
// retrieve the current interfaces - returns 0 on success
success = getifaddrs(&interfaces);
if (success == 0)
{
// Loop through linked list of interfaces
temp_addr = interfaces;
while(temp_addr != NULL)
{
if(temp_addr->ifa_addr->sa_family == AF_INET)
{
// Check if interface is en0 which is the wifi connection on the iPhone
if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:#"en0"])
{
// Get NSString from C String
address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
}
}
temp_addr = temp_addr->ifa_next;
}
}
// Free memory
freeifaddrs(interfaces);
return address;
}
but the problem is that he get me this ip
10.0.0.1
How to get the external ip?
The easiest way to get your internet ip address from code is to use NSURLConnection.
For the URL you can use:
http://www.whatismyip.com/m/mobile.asp
or
http://checkip.dyndns.com/
Just parse the return data and you have your external ip address.
Have a look at the example in my second Answer here.
In a nutshell it uses *http://www.dyndns.org/cgi-bin/check_ip.cg*i to get the extenal I.P
Check Apple's PortMapper, does exactly what you want.
As of iOS7 this is irrelevant.
Late to the party, but https://api4.ipify.org or http://api4.ipify.org returns nothing else but the external IPv4 address of your connection. Code:
NSURL *ipifyUrl = [NSURL URLWithString:#"https://api4.ipify.org/"];
NSString *externalAddr = [NSString stringWithContentsOfURL:ipifyUrl encoding:NSUTF8StringEncoding error:nil];
https://api6.ipify.org returns the external IPv6 address and https://api64.ipify.org either the IPv4 or the IPv6 address. Simple documentation can be found at https://www.ipify.org
i want to perform some DNS queries e.g. to get IP records against a specific domain name, i am looking for a preferred way or some useful snippet for this on iOS 3.2+ SDK.
thanx in advance
part from other snippets i found this code
Boolean result;
CFHostRef hostRef;
NSArray *addresses;
NSString *hostname = #"apple.com";
hostRef = CFHostCreateWithName(kCFAllocatorDefault, (CFStringRef)hostname);
if (hostRef) {
result = CFHostStartInfoResolution(hostRef, kCFHostAddresses, NULL); // pass an error instead of NULL here to find out why it failed
if (result == TRUE) {
addresses = (NSArray*)CFHostGetAddressing(hostRef, &result);
}
}
if (result == TRUE) {
[addresses enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSString *strDNS = [NSString stringWithUTF8String:inet_ntoa(*((struct in_addr *)obj))];
NSLog(#"Resolved %d->%#", idx, strDNS);
}];
} else {
NSLog(#"Not resolved");
}
but this is producing same IP for every host Resolved 0->220.120.64.1 any help??
Figured out a change in this snippet makes it working
if (result == TRUE) {
NSMutableArray *tempDNS = [[NSMutableArray alloc] init];
for(int i = 0; i < CFArrayGetCount(addresses); i++){
struct sockaddr_in* remoteAddr;
CFDataRef saData = (CFDataRef)CFArrayGetValueAtIndex(addresses, i);
remoteAddr = (struct sockaddr_in*)CFDataGetBytePtr(saData);
if(remoteAddr != NULL){
// Extract the ip address
//const char *strIP41 = inet_ntoa(remoteAddr->sin_addr);
NSString *strDNS =[NSString stringWithCString:inet_ntoa(remoteAddr->sin_addr) encoding:NSASCIIStringEncoding];
NSLog(#"RESOLVED %d:<%#>", i, strDNS);
[tempDNS addObject:strDNS];
}
}
}
Bros there is a lot simpler way! Thanks to iOS being a unix system, you become a god with unlimited power and resource! I present elegance.
- (NSString*)lookupHostIPAddressForURL:(NSURL*)url
{
// Ask the unix subsytem to query the DNS
struct hostent *remoteHostEnt = gethostbyname([[url host] UTF8String]);
// Get address info from host entry
struct in_addr *remoteInAddr = (struct in_addr *) remoteHostEnt->h_addr_list[0];
// Convert numeric addr to ASCII string
char *sRemoteInAddr = inet_ntoa(*remoteInAddr);
// hostIP
NSString* hostIP = [NSString stringWithUTF8String:sRemoteInAddr];
return hostIP;
}
I want to find IP address in an application. I am able to find it. But, problem is, it works fins in iphone os 2.0 or so. But, in iphone os 3.0 it is giving me a warning:
warning: no '+currentHost' method found
warning: (Messages without a matching method signature)
I am using this code, and it works fine with os version 2.0.
-(NSString*)getAddress {
char iphone_ip[255];
strcpy(iphone_ip,"127.0.0.1"); // if everything fails
NSHost* myhost = [NSHost currentHost];
if (myhost)
{
NSString *ad = [myhost address];
if (ad)
strcpy(iphone_ip,[ad cStringUsingEncoding: NSISOLatin1StringEncoding]);
}
return [NSString stringWithFormat:#"%s",iphone_ip];
}
How to find IP address in iphone os 3.0 or greater os version?
Thanks in advance.
#include <arpa/inet.h>
#include <netdb.h>
#include <net/if.h>
#include <ifaddrs.h>
// retun the host name
+ (NSString *)hostname
{
char baseHostName[256];
int success = gethostname(baseHostName, 255);
if (success != 0) return nil;
baseHostName[255] = '\0';
#if !TARGET_IPHONE_SIMULATOR
return [NSString stringWithFormat:#"%s.local", baseHostName];
#else
return [NSString stringWithFormat:#"%s", baseHostName];
#endif
}
// return IP Address
+ (NSString *)localIPAddress
{
struct hostent *host = gethostbyname([[self hostname] UTF8String]);
if (!host) {herror("resolv"); return nil;}
struct in_addr **list = (struct in_addr **)host->h_addr_list;
return [NSString stringWithCString:inet_ntoa(*list[0]) encoding:NSUTF8StringEncoding];
}
As far as I know there is only one hacky way to do that. You basically open a socket and get its address using POSIX functions. Here is the code I used for this:
http://iphonesdksnippets.com/post/2009/09/07/Get-IP-address-of-iPhone.aspx
[NSHost currentHost] will also work, but it is deprecated and considered a "Private API" by Apple, so you won't be able to submit your application to App Store.
Put this script on a web server running PHP:
<?php
$ip = getenv("REMOTE_ADDR");
echo $ip;
?>
Call this on the device:
NSURL *scriptURL = [[NSURL alloc] initWithString:#"http://yourserver.com/script.php"];
NSString *ip = [NSString stringWithContentsOfURL: scriptURL encoding:NSASCIIStringEncoding error:nil];
- (NSString *)getIPAddress {
NSString *address = #"error";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
// retrieve the current interfaces - returns 0 on success
success = getifaddrs(&interfaces);
if (success == 0) {
// Loop through linked list of interfaces
temp_addr = interfaces;
while(temp_addr != NULL) {
if(temp_addr->ifa_addr->sa_family == AF_INET) {
// Check if interface is en0 which is the wifi connection on the iPhone
// it may also be en1 on your ipad3.
if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:#"en0"]) {
// Get NSString from C String
address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
}
}
temp_addr = temp_addr->ifa_next;
}
}
// Free memory
freeifaddrs(interfaces);
return address;
}
Use this to get your IP
If any errors
Please use
#include <ifaddrs.h>
#include <arpa/inet.h>
Getting the IP address is a bit hacky. Are you sure you couldn't live with the device ID (UDID) that is unique to each iPhone and can be retrieved easily via the public API ?
[UIDevice currentDevice].uniqueIdentifier
There is one more way to get the IP address and that too Global IP
NSString* ip=#"http://www.whatismyip.org/";
NSURL *url = [[NSURL alloc] initWithString:ip];
NSString *ans = [NSString stringWithContentsOfURL:url encoding:NSASCIIStringEncoding error:&error];
NSLog(#"%#",ans);
The above site will give you the Global IP.
Just put this in your code and use the IP address where ever you want and also get the location of the user using your app as this gives global IP.
You should have a look to this good project:
uidevice-extension
Specialy this class
Import UIDevice-Reachability.h in your project then try with one of those commands:
NSString *myIp = [UIDevice localIPAddress];
NSString *myIp = [UIDevice localWiFiIPAddress];
NSString *myIp = [UIDevice whatismyipdotcom]; // is using #aamritrao solution
bool success;
struct ifaddrs *addrs;
const struct ifaddrs *cursor;
const struct sockaddr_dl *dlAddr;
const uint8_t *base;
int i;
success = getifaddrs(&addrs) == 0;
if (success) {
cursor = addrs;
while (cursor != NULL) {
if ( (cursor->ifa_addr->sa_family == AF_LINK)
&& (((const struct sockaddr_dl *) cursor->ifa_addr)->sdl_type ==IFT_ETHER)
) {
dlAddr = (const struct sockaddr_dl *) cursor->ifa_addr;
// fprintf(stderr, " sdl_nlen = %d\n", dlAddr->sdl_nlen);
// fprintf(stderr, " sdl_alen = %d\n", dlAddr->sdl_alen);
base = (const uint8_t *) &dlAddr->sdl_data[dlAddr->sdl_nlen];
printf(" MAC address ");
for (i = 0; i < dlAddr->sdl_alen; i++) {
if (i != 0) {
printf(":");
}
printf("%02x", base[i]);
}
printf("\n");
}
cursor = cursor->ifa_next;
}
}
Excuse my iPhone/Objective-C newbie status please!
I've found my HTTP server using NSNetServiceBrowser, but now I just want the IP address and port of the service found.
I've got something like the following in my delegate method:
NSNetService* server = [serverBrowser.servers objectAtIndex:0];
NSString *name = nil;
NSData *address = nil;
struct sockaddr_in *socketAddress = nil;
NSString *ipString = nil;
int port;
uint i;
for (i = 0; i < [[server addresses] count]; i++)
{
name = [server name];
address = [[server addresses] objectAtIndex:i];
socketAddress = (struct sockaddr_in *)
[address bytes];
ipString = [NSString stringWithFormat: #"%s",
inet_ntoa (socketAddress->sin_addr)];
port = socketAddress->sin_port;
NSLog(#"Server found is %s %d",ipString,port);
}
but the for loop is never entered, even though the delegate is called. Any ideas? Thanks!
I realize this is an old thread, but I've just run across this as well. There are a few problems with the code above:
It's not IPv6 savvy. At a
minimum, it should detect and
discard IPv6 addresses if the rest
of your app can only handle v4
addresses, but ideally you should be
prepared to pass both address
families upstream.
The port assignment will
generate incorrect values for Intel
processors. You need to use htons
to fix that.
As Andrew noted above, the
iteration should use the enhanced
for loop.
(EDIT: Added this) As noted on another related thread, the use of inet_ntoa is discouraged in favor of inet_ntop.
Putting all of this together, you get:
char addressBuffer[INET6_ADDRSTRLEN];
for (NSData *data in self.addresses)
{
memset(addressBuffer, 0, INET6_ADDRSTRLEN);
typedef union {
struct sockaddr sa;
struct sockaddr_in ipv4;
struct sockaddr_in6 ipv6;
} ip_socket_address;
ip_socket_address *socketAddress = (ip_socket_address *)[data bytes];
if (socketAddress && (socketAddress->sa.sa_family == AF_INET || socketAddress->sa.sa_family == AF_INET6))
{
const char *addressStr = inet_ntop(
socketAddress->sa.sa_family,
(socketAddress->sa.sa_family == AF_INET ? (void *)&(socketAddress->ipv4.sin_addr) : (void *)&(socketAddress->ipv6.sin6_addr)),
addressBuffer,
sizeof(addressBuffer));
int port = ntohs(socketAddress->sa.sa_family == AF_INET ? socketAddress->ipv4.sin_port : socketAddress->ipv6.sin6_port);
if (addressStr && port)
{
NSLog(#"Found service at %s:%d", addressStr, port);
}
}
}
The NSNetService you get back in the callback isn't ready to be used. You have to call the following method to get addresses for it:
- (void)resolveWithTimeout:(NSTimeInterval)timeout;
Implement the NSNetService delegate method to find out when it resolves:
- (void)netServiceDidResolveAddress:(NSNetService *)sender;
At that point, there should be at least one address in the service.
Also, take care to read the documentation and the header file carefully! There is some complexity to the issue here that I've glossed over.
Remix of the accepted answer in a category:
NSNetService+Util.h
#import <Foundation/Foundation.h>
#interface NSNetService (Util)
- (NSArray*) addressesAndPorts;
#end
#interface AddressAndPort : NSObject
#property (nonatomic, assign) int port;
#property (nonatomic, strong) NSString *address;
#end
NSNetService+Util.m
#import "NSNetService+Util.h"
#include <arpa/inet.h>
#implementation NSNetService (Util)
- (NSArray*) addressesAndPorts {
// this came from http://stackoverflow.com/a/4976808/8047
NSMutableArray *retVal = [NSMutableArray array];
char addressBuffer[INET6_ADDRSTRLEN];
for (NSData *data in self.addresses)
{
memset(addressBuffer, 0, INET6_ADDRSTRLEN);
typedef union {
struct sockaddr sa;
struct sockaddr_in ipv4;
struct sockaddr_in6 ipv6;
} ip_socket_address;
ip_socket_address *socketAddress = (ip_socket_address *)[data bytes];
if (socketAddress && (socketAddress->sa.sa_family == AF_INET || socketAddress->sa.sa_family == AF_INET6))
{
const char *addressStr = inet_ntop(
socketAddress->sa.sa_family,
(socketAddress->sa.sa_family == AF_INET ? (void *)&(socketAddress->ipv4.sin_addr) : (void *)&(socketAddress->ipv6.sin6_addr)),
addressBuffer,
sizeof(addressBuffer));
int port = ntohs(socketAddress->sa.sa_family == AF_INET ? socketAddress->ipv4.sin_port : socketAddress->ipv6.sin6_port);
if (addressStr && port)
{
AddressAndPort *aAndP = [[AddressAndPort alloc] init];
aAndP.address = [NSString stringWithCString:addressStr encoding:kCFStringEncodingUTF8];
aAndP.port = port;
[retVal addObject:aAndP];
}
}
}
return retVal;
}
#end
#implementation AddressAndPort
#end
[Yes, I have no fear of creating lots of NSObject instances...]