How do i get my local IpAddress?
我如何获得我的本地IpAddress?
I tried to use this Obj C
example: how to get ip address of iphone programmatically
我尝试使用这个Obj C示例:如何以编程方式获取iphone的ip地址
When i get to the function getifaddrs()
i can't get any further. i can't use the function.
当我到达getifaddrs()函数时,我无法继续。我不能使用该功能。
Is there an alternative way to do this, or am I approaching this the wrong way?
有没有其他方法可以做到这一点,或者我是以错误的方式接近这个?
3 个解决方案
#1
40
As it turned out in the discussion, OP needs the interface address on a Mac and not on an iOS device as I thought initially. The code referenced in the question checks for the interface name "en0", which is the WiFi interface on the iPhone. On a Mac it makes more sense to check for any "up-and-running" interface instead. Therefore I have rewritten the answer. It is now a Swift translation of the code in Detect any connected network.
正如在讨论中所说,OP需要Mac上的接口地址而不是我最初想到的iOS设备上的接口地址。问题中引用的代码检查接口名称“en0”,即iPhone上的WiFi接口。在Mac上,检查任何“正在运行”的界面更有意义。因此我改写了答案。它现在是检测任何连接网络中的代码的Swift转换。
getifaddrs()
is defined in <ifaddrs.h>
, which is not included by default. Therefore you have to create a bridging header and add
getifaddrs()在
#include <ifaddrs.h>
The following function returns an array with the names of all local "up-and-running" network interfaces.
以下函数返回一个数组,其中包含所有本地“正在运行”的网络接口的名称。
func getIFAddresses() -> [String] {
var addresses = [String]()
// Get list of all interfaces on the local machine:
var ifaddr : UnsafeMutablePointer<ifaddrs> = nil
if getifaddrs(&ifaddr) == 0 {
// For each interface ...
var ptr = ifaddr
while ptr != nil {
defer { ptr = ptr.memory.ifa_next }
let flags = Int32(ptr.memory.ifa_flags)
let addr = ptr.memory.ifa_addr.memory
// Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {
// Convert interface address to a human readable string:
var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)
if (getnameinfo(ptr.memory.ifa_addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),
nil, socklen_t(0), NI_NUMERICHOST) == 0) {
if let address = String.fromCString(hostname) {
addresses.append(address)
}
}
}
}
}
freeifaddrs(ifaddr)
}
return addresses
}
Update for Swift 3: In addition to adopting the code to the many changes in Swift 3, iterating over all interfaces can now use the new generalized sequence()
function:
更新Swift 3:除了对Swift 3中的许多更改采用代码之外,迭代所有接口现在可以使用新的通用sequence()函数:
func getIFAddresses() -> [String] {
var addresses = [String]()
// Get list of all interfaces on the local machine:
var ifaddr : UnsafeMutablePointer<ifaddrs>?
guard getifaddrs(&ifaddr) == 0 else { return [] }
guard let firstAddr = ifaddr else { return [] }
// For each interface ...
for ptr in sequence(first: firstAddr, next: { $0.pointee.ifa_next }) {
let flags = Int32(ptr.pointee.ifa_flags)
let addr = ptr.pointee.ifa_addr.pointee
// Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {
// Convert interface address to a human readable string:
var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
if (getnameinfo(ptr.pointee.ifa_addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),
nil, socklen_t(0), NI_NUMERICHOST) == 0) {
let address = String(cString: hostname)
addresses.append(address)
}
}
}
}
freeifaddrs(ifaddr)
return addresses
}
#2
2
Answering to Is there an alternative way to getifaddrs() for getting the ip-address?
回答有没有另一种方法来获取IP地址的getifaddrs()?
Yes, there is an alternative way. You can also get the ip address by utilizing ioctl()
. The cleanest way would be doing it in C and then wrapping it up in Swift. So consider this:
是的,还有另一种方法。您还可以使用ioctl()获取IP地址。最干净的方法是在C中进行,然后将其包装在Swift中。所以考虑一下:
Create a C Source File
(Xcode should create it together with a .h) and remember adding the header into your project's bridging header, or into umbrella-header if you have a cocoa touch framework.
创建一个C源文件(Xcode应该与.h一起创建)并记住将标题添加到项目的桥接头中,或者如果你有一个可可触摸框架,则添加到伞形头文件中。
Add the following into your .c source and method's declaration into .h:
将以下内容添加到.c源代码和方法的声明中.h:
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
int _interfaceAddressForName(char* interfaceName, struct sockaddr* interfaceAddress) {
struct ifreq ifr;
int fd = socket(AF_INET, SOCK_DGRAM, 0);
ifr.ifr_addr.sa_family = AF_INET;
strncpy(ifr.ifr_name, interfaceName, IFNAMSIZ-1);
int ioctl_res;
if ( (ioctl_res = ioctl(fd, SIOCGIFADDR, &ifr)) < 0){
return ioctl_res;
}
close(fd);
memcpy(interfaceAddress, &ifr.ifr_addr, sizeof(struct sockaddr));
return 0;
}
Your Swift wrapper might look something like:
您的Swift包装器可能类似于:
public enum Error:ErrorType {
case IOCTLFailed(Int32)
case StringIsNotAnASCIIString
}
public func interfaceAddress(forInterfaceWithName interfaceName: String) throws -> sockaddr_in {
guard let cString = interfaceName.cStringUsingEncoding(NSASCIIStringEncoding) else {
throw Error.StringIsNotAnASCIIString
}
let addressPtr = UnsafeMutablePointer<sockaddr>.alloc(1)
let ioctl_res = _interfaceAddressForName(strdup(cString), addressPtr)
let address = addressPtr.move()
addressPtr.dealloc(1)
if ioctl_res < 0 {
throw Error.IOCTLFailed(errno)
} else {
return unsafeBitCast(address, sockaddr_in.self)
}
}
Then you can use it in your code like:
然后你可以在你的代码中使用它,如:
let interfaceName = "en0"
do {
let wlanInterfaceAddress = try interfaceAddress(forInterfaceWithName: interfaceName)
print(String.fromCString(inet_ntoa(wlanInterfaceAddress.sin_addr))!)
} catch {
if case Error.IOCTLFailed(let errno) = error where errno == ENXIO {
print("interface(\(interfaceName)) is not available")
} else {
print(error)
}
}
en0
typically is the interface you need, which stands for WLAN
en0通常是您需要的接口,代表WLAN
If you also need to know available interface names you can utilize if_indextoname()
:
如果您还需要知道可用的接口名称,可以使用if_indextoname():
public func interfaceNames() -> [String] {
let MAX_INTERFACES = 128;
var interfaceNames = [String]()
let interfaceNamePtr = UnsafeMutablePointer<Int8>.alloc(Int(IF_NAMESIZE))
for interfaceIndex in 1...MAX_INTERFACES {
if (if_indextoname(UInt32(interfaceIndex), interfaceNamePtr) != nil){
if let interfaceName = String.fromCString(interfaceNamePtr) {
interfaceNames.append(interfaceName)
}
} else {
break
}
}
interfaceNamePtr.dealloc(Int(IF_NAMESIZE))
return interfaceNames
}
#3
1
Unfortunately neither of methods will work in iOS 11 since Apple has blocked third-party developer access to MAC addresses. Networking apps developers even filed petition to Apple to revert this policy https://www.change.org/p/apple-save-networking-tools-on-ios-11
不幸的是,由于Apple阻止了第三方开发者访问MAC地址,因此这两种方法都不适用于iOS 11。网络应用程序开发人员甚至向Apple提交请愿书以恢复此政策https://www.change.org/p/apple-save-networking-tools-on-ios-11
#1
40
As it turned out in the discussion, OP needs the interface address on a Mac and not on an iOS device as I thought initially. The code referenced in the question checks for the interface name "en0", which is the WiFi interface on the iPhone. On a Mac it makes more sense to check for any "up-and-running" interface instead. Therefore I have rewritten the answer. It is now a Swift translation of the code in Detect any connected network.
正如在讨论中所说,OP需要Mac上的接口地址而不是我最初想到的iOS设备上的接口地址。问题中引用的代码检查接口名称“en0”,即iPhone上的WiFi接口。在Mac上,检查任何“正在运行”的界面更有意义。因此我改写了答案。它现在是检测任何连接网络中的代码的Swift转换。
getifaddrs()
is defined in <ifaddrs.h>
, which is not included by default. Therefore you have to create a bridging header and add
getifaddrs()在
#include <ifaddrs.h>
The following function returns an array with the names of all local "up-and-running" network interfaces.
以下函数返回一个数组,其中包含所有本地“正在运行”的网络接口的名称。
func getIFAddresses() -> [String] {
var addresses = [String]()
// Get list of all interfaces on the local machine:
var ifaddr : UnsafeMutablePointer<ifaddrs> = nil
if getifaddrs(&ifaddr) == 0 {
// For each interface ...
var ptr = ifaddr
while ptr != nil {
defer { ptr = ptr.memory.ifa_next }
let flags = Int32(ptr.memory.ifa_flags)
let addr = ptr.memory.ifa_addr.memory
// Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {
// Convert interface address to a human readable string:
var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)
if (getnameinfo(ptr.memory.ifa_addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),
nil, socklen_t(0), NI_NUMERICHOST) == 0) {
if let address = String.fromCString(hostname) {
addresses.append(address)
}
}
}
}
}
freeifaddrs(ifaddr)
}
return addresses
}
Update for Swift 3: In addition to adopting the code to the many changes in Swift 3, iterating over all interfaces can now use the new generalized sequence()
function:
更新Swift 3:除了对Swift 3中的许多更改采用代码之外,迭代所有接口现在可以使用新的通用sequence()函数:
func getIFAddresses() -> [String] {
var addresses = [String]()
// Get list of all interfaces on the local machine:
var ifaddr : UnsafeMutablePointer<ifaddrs>?
guard getifaddrs(&ifaddr) == 0 else { return [] }
guard let firstAddr = ifaddr else { return [] }
// For each interface ...
for ptr in sequence(first: firstAddr, next: { $0.pointee.ifa_next }) {
let flags = Int32(ptr.pointee.ifa_flags)
let addr = ptr.pointee.ifa_addr.pointee
// Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {
// Convert interface address to a human readable string:
var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
if (getnameinfo(ptr.pointee.ifa_addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),
nil, socklen_t(0), NI_NUMERICHOST) == 0) {
let address = String(cString: hostname)
addresses.append(address)
}
}
}
}
freeifaddrs(ifaddr)
return addresses
}
#2
2
Answering to Is there an alternative way to getifaddrs() for getting the ip-address?
回答有没有另一种方法来获取IP地址的getifaddrs()?
Yes, there is an alternative way. You can also get the ip address by utilizing ioctl()
. The cleanest way would be doing it in C and then wrapping it up in Swift. So consider this:
是的,还有另一种方法。您还可以使用ioctl()获取IP地址。最干净的方法是在C中进行,然后将其包装在Swift中。所以考虑一下:
Create a C Source File
(Xcode should create it together with a .h) and remember adding the header into your project's bridging header, or into umbrella-header if you have a cocoa touch framework.
创建一个C源文件(Xcode应该与.h一起创建)并记住将标题添加到项目的桥接头中,或者如果你有一个可可触摸框架,则添加到伞形头文件中。
Add the following into your .c source and method's declaration into .h:
将以下内容添加到.c源代码和方法的声明中.h:
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
int _interfaceAddressForName(char* interfaceName, struct sockaddr* interfaceAddress) {
struct ifreq ifr;
int fd = socket(AF_INET, SOCK_DGRAM, 0);
ifr.ifr_addr.sa_family = AF_INET;
strncpy(ifr.ifr_name, interfaceName, IFNAMSIZ-1);
int ioctl_res;
if ( (ioctl_res = ioctl(fd, SIOCGIFADDR, &ifr)) < 0){
return ioctl_res;
}
close(fd);
memcpy(interfaceAddress, &ifr.ifr_addr, sizeof(struct sockaddr));
return 0;
}
Your Swift wrapper might look something like:
您的Swift包装器可能类似于:
public enum Error:ErrorType {
case IOCTLFailed(Int32)
case StringIsNotAnASCIIString
}
public func interfaceAddress(forInterfaceWithName interfaceName: String) throws -> sockaddr_in {
guard let cString = interfaceName.cStringUsingEncoding(NSASCIIStringEncoding) else {
throw Error.StringIsNotAnASCIIString
}
let addressPtr = UnsafeMutablePointer<sockaddr>.alloc(1)
let ioctl_res = _interfaceAddressForName(strdup(cString), addressPtr)
let address = addressPtr.move()
addressPtr.dealloc(1)
if ioctl_res < 0 {
throw Error.IOCTLFailed(errno)
} else {
return unsafeBitCast(address, sockaddr_in.self)
}
}
Then you can use it in your code like:
然后你可以在你的代码中使用它,如:
let interfaceName = "en0"
do {
let wlanInterfaceAddress = try interfaceAddress(forInterfaceWithName: interfaceName)
print(String.fromCString(inet_ntoa(wlanInterfaceAddress.sin_addr))!)
} catch {
if case Error.IOCTLFailed(let errno) = error where errno == ENXIO {
print("interface(\(interfaceName)) is not available")
} else {
print(error)
}
}
en0
typically is the interface you need, which stands for WLAN
en0通常是您需要的接口,代表WLAN
If you also need to know available interface names you can utilize if_indextoname()
:
如果您还需要知道可用的接口名称,可以使用if_indextoname():
public func interfaceNames() -> [String] {
let MAX_INTERFACES = 128;
var interfaceNames = [String]()
let interfaceNamePtr = UnsafeMutablePointer<Int8>.alloc(Int(IF_NAMESIZE))
for interfaceIndex in 1...MAX_INTERFACES {
if (if_indextoname(UInt32(interfaceIndex), interfaceNamePtr) != nil){
if let interfaceName = String.fromCString(interfaceNamePtr) {
interfaceNames.append(interfaceName)
}
} else {
break
}
}
interfaceNamePtr.dealloc(Int(IF_NAMESIZE))
return interfaceNames
}
#3
1
Unfortunately neither of methods will work in iOS 11 since Apple has blocked third-party developer access to MAC addresses. Networking apps developers even filed petition to Apple to revert this policy https://www.change.org/p/apple-save-networking-tools-on-ios-11
不幸的是,由于Apple阻止了第三方开发者访问MAC地址,因此这两种方法都不适用于iOS 11。网络应用程序开发人员甚至向Apple提交请愿书以恢复此政策https://www.change.org/p/apple-save-networking-tools-on-ios-11