blocks|key|76760|text|回答Is+there+an+alternative+way+to+getifaddrs()+for+getting+the+ip-address?的问题|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|76761|是的，还有另一种方法。您还可以通过使用ioctl()获取ip地址。最干净的方法是用C语言，然后用Swift把它包装起来。因此请考虑以下内容：|76762|创建一个C+Source+File+(Xcode应该将它与.h一起创建)，并记住将头部添加到项目的桥头中，或者如果您有一个可可触摸框架，则将头部添加到伞头中。|76763|将以下代码添加到.c源代码中，并将方法声明添加到.h中：|76764|#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;
}|code-block|syntax|javascript|76765|你的Swift包装器可能看起来像这样：|76766|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)
++++}
}|76767|然后，您可以在代码中使用它，如下所示：|76768|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)
++++}
}|76769|en0通常是您需要的接口，它代表WLAN|76770|如果您还需要知道可用的接口名称，则可以使用if_indextoname()|76771|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
}|76772|entityMap^0|2|1Z|0|J|7|0|4|D|0|0|0|0|0|0|0|0|3|G|4|0|L|G|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1F|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|1G|8|@]|D|@]|E|$O|P]]|$1|Q|3|R|5|6|7|1H|8|@]|D|@]|E|$]]|$1|S|3|T|5|N|7|1I|8|@]|D|@]|E|$O|P]]|$1|U|3|V|5|6|7|1J|8|@]|D|@]|E|$]]|$1|W|3|X|5|N|7|1K|8|@]|D|@]|E|$O|P]]|$1|Y|3|Z|5|6|7|1L|8|@$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|10|3|11|5|6|7|1Q|8|@$9|1R|A|1S|B|C]]|D|@]|E|$]]|$1|12|3|13|5|N|7|1T|8|@]|D|@]|E|$O|P]]|$1|14|3|-4|5|6|7|1U|8|@]|D|@]|E|$]]]|15|$]]

Answering to <code>Is there an alternative way to getifaddrs() for getting the ip-address?</code>

Yes, there is an alternative way. You can also get the ip address by utilizing <code>ioctl()</code>. The cleanest way would be doing it in C and then wrapping it up in Swift. So consider this:

Create a <code>C Source File</code> (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. 

Add the following into your .c source and method's declaration into .h:

<pre><code>#include &lt;string.h&gt;
#include &lt;unistd.h&gt;
#include &lt;sys/types.h&gt;
#include &lt;sys/socket.h&gt;
#include &lt;sys/ioctl.h&gt;
#include &lt;netinet/in.h&gt;
#include &lt;net/if.h&gt;

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, &amp;ifr)) &lt; 0){
 return ioctl_res;
 }

 close(fd);
 memcpy(interfaceAddress, &amp;ifr.ifr_addr, sizeof(struct sockaddr));
 return 0;
}
</code></pre>

Your Swift wrapper might look something like:

<pre><code>public enum Error:ErrorType {
 case IOCTLFailed(Int32)
 case StringIsNotAnASCIIString
}

public func interfaceAddress(forInterfaceWithName interfaceName: String) throws -&gt; sockaddr_in {

 guard let cString = interfaceName.cStringUsingEncoding(NSASCIIStringEncoding) else {
 throw Error.StringIsNotAnASCIIString
 }

 let addressPtr = UnsafeMutablePointer&lt;sockaddr&gt;.alloc(1)
 let ioctl_res = _interfaceAddressForName(strdup(cString), addressPtr)
 let address = addressPtr.move()
 addressPtr.dealloc(1)

 if ioctl_res &lt; 0 {
 throw Error.IOCTLFailed(errno)
 } else {
 return unsafeBitCast(address, sockaddr_in.self)
 }
}
</code></pre>

Then you can use it in your code like:

<pre><code>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)
 }
}
</code></pre>

<code>en0</code> typically is the interface you need, which stands for <code>WLAN</code>

If you also need to know available interface names you can utilize <code>if_indextoname()</code>:

<pre><code>public func interfaceNames() -&gt; [String] {

 let MAX_INTERFACES = 128;

 var interfaceNames = [String]()
 let interfaceNamePtr = UnsafeMutablePointer&lt;Int8&gt;.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
}
</code></pre>

blocks|key|76787|text|+++func+getIfConfigOutput()+->+[String:String]+{
++++let+cmd+=+"for+i+in+$(ifconfig+-lu);+do+if+ifconfig+$i+%7C+grep+-q+\"status:+active\"+;+then+echo+$i;+fi;+done"
++++let+interfaceString+=+shell(cmd)
++++let+interfaceArray+=+interfaceString.components(separatedBy:+"\n")
++++var+finalDictionary:[String:String]+=+[String:String]()
++++for+(i,_)+in+interfaceArray.enumerated()+{
++++++++if+(interfaceArray[i].hasPrefix("en")){
++++++++++++let+sp+=+shell("ifconfig+\(interfaceArray[i])+%7C+grep+\"inet+\"+%7C+grep+-v+127.0.0.1+%7C+cut+-d\\++-f2")
++++++++++finalDictionary[interfaceArray[i]]+=+sp.replacingOccurrences(of:+"\n",+with:+"")
++++++++}
++++}
++print(finalDictionary)
++++return+finalDictionary
}
func+shell(_+args:+String)+->+String+{
++++var+outstr+=+""
++++let+task+=+Process()
++++task.launchPath+=+"/bin/sh"
++++task.arguments+=+["-c",+args]
++++let+pipe+=+Pipe()
++++task.standardOutput+=+pipe
++++task.launch()
++++let+data+=+pipe.fileHandleForReading.readDataToEndOfFile()
++++if+let+output+=+NSString(data:+data,+encoding:+String.Encoding.utf8.rawValue)+{
++++++++outstr+=+output+as+String
++++}
++++task.waitUntilExit()
++++return+outstr
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|76788|这会对你有帮助。代码返回一个带有与之关联的接口和IP地址的字典。|unstyled|76789|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code> func getIfConfigOutput() -&gt; [String:String] {
 let cmd = "for i in $(ifconfig -lu); do if ifconfig $i | grep -q \"status: active\" ; then echo $i; fi; done"
 let interfaceString = shell(cmd)
 let interfaceArray = interfaceString.components(separatedBy: "\n")
 var finalDictionary:[String:String] = [String:String]()
 for (i,_) in interfaceArray.enumerated() {
 if (interfaceArray[i].hasPrefix("en")){
 let sp = shell("ifconfig \(interfaceArray[i]) | grep \"inet \" | grep -v 127.0.0.1 | cut -d\\ -f2")
 finalDictionary[interfaceArray[i]] = sp.replacingOccurrences(of: "\n", with: "")
 }
 }
 print(finalDictionary)
 return finalDictionary
}
func shell(_ args: String) -&gt; String {
 var outstr = ""
 let task = Process()
 task.launchPath = "/bin/sh"
 task.arguments = ["-c", args]
 let pipe = Pipe()
 task.standardOutput = pipe
 task.launch()
 let data = pipe.fileHandleForReading.readDataToEndOfFile()
 if let output = NSString(data: data, encoding: String.Encoding.utf8.rawValue) {
 outstr = output as String
 }
 task.waitUntilExit()
 return outstr
}
</code></pre>

This will help you. Code Returns a Dictionary with Interfaces and IP Addresses Associated with it.

blocks|key|76806|text|在Swift+5中，您可以直接对Swift使用ioctl，而不是求助于'C‘来获取给定接口的IP地址详细信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|76807|如下所示：|76808|private+enum+AddressRequestType+{
++++case+ipAddress
++++case+netmask
}

//+From+BDS+ioccom.h
//+Macro+to+create+ioctl+request
private+static+func+_IOC+(_+io:+UInt32,+_+group:+UInt32,+_+num:+UInt32,+_+len:+UInt32)+->+UInt32+{
++++let+rv+=+io+%7C+((+len+&+UInt32(IOCPARM_MASK))+<<+16)+%7C+((group+<<+8)+%7C+num)
++++return+rv
}

//+Macro+to+create+read/write+IOrequest
private+static+func+_IOWR+(_+group:+Character+,+_+num+:+UInt32,+_+size:+UInt32)+->+UInt32+{
++++return+_IOC(IOC_INOUT,+UInt32+(group.asciiValue!),+num,+size)
}

private+static+func+_interfaceAddressForName+(_+name:+String,+_+requestType:+AddressRequestType)+throws+->+String+{
++++
++++var+ifr+=+ifreq+()
++++ifr.ifr_ifru.ifru_addr.sa_family+=+sa_family_t(AF_INET)
++++
++++//+Copy+the+name+into+a+zero+padded+16+CChar+buffer
++++
++++let+ifNameSize+=+Int+(IFNAMSIZ)
++++var+b+=+[CChar]+(repeating:+0,+count:+ifNameSize)
++++strncpy+(&b,+name,+ifNameSize)
++++
++++//+Convert+the+buffer+to+a+16+CChar+tuple+-+that's+what+ifreq+needs
++++ifr.ifr_name+=+(b+[0],+b+[1],+b+[2],+b+[3],+b+[4],+b+[5],+b+[6],+b+[7],+b+[8],+b+[9],+b+[10],+b+[11],+b+[12],+b+[13],+b+[14],+b+[15])
++++
++++let+ioRequest:+UInt32+=+{
++++++++switch+requestType+{
++++++++case+.ipAddress:+return+_IOWR("i",+33,+UInt32(MemoryLayout<ifreq>.size))++++//+Magic+number+SIOCGIFADDR+-+see+sockio.h
++++++++case+.netmask:+return+_IOWR("i",+37,+UInt32(MemoryLayout<ifreq>.size))++++++//+Magic+number+SIOCGIFNETMASK
++++++++}
++++}+()
++++
++++if+ioctl(socket(AF_INET,+SOCK_DGRAM,+0),+UInt(ioRequest),+&ifr)+<+0+{
++++++++throw+POSIXError+(POSIXErrorCode+(rawValue:+errno)+??+POSIXErrorCode.EINVAL)
++++}
++++
++++let+sin+=+unsafeBitCast(ifr.ifr_ifru.ifru_addr,+to:+sockaddr_in.self)
++++let+rv+=+String+(cString:+inet_ntoa+(sin.sin_addr))
++++
++++return+rv
}

public+static+func+getInterfaceIPAddress+(interfaceName:+String)+throws+->+String+{
++++return+try+_interfaceAddressForName(interfaceName,+.ipAddress)
}

public+static+func+getInterfaceNetMask+(interfaceName:+String)+throws+->+String+{
++++return+try+_interfaceAddressForName(interfaceName,+.netmask)
}|code-block|syntax|javascript|76809|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In Swift 5 you can use ioctl directly with Swift rather than resorting to 'C' to get the IP address details for a given interface.
Like this:
<pre><code>private enum AddressRequestType {
 case ipAddress
 case netmask
}

// From BDS ioccom.h
// Macro to create ioctl request
private static func _IOC (_ io: UInt32, _ group: UInt32, _ num: UInt32, _ len: UInt32) -&gt; UInt32 {
 let rv = io | (( len &amp; UInt32(IOCPARM_MASK)) &lt;&lt; 16) | ((group &lt;&lt; 8) | num)
 return rv
}

// Macro to create read/write IOrequest
private static func _IOWR (_ group: Character , _ num : UInt32, _ size: UInt32) -&gt; UInt32 {
 return _IOC(IOC_INOUT, UInt32 (group.asciiValue!), num, size)
}

private static func _interfaceAddressForName (_ name: String, _ requestType: AddressRequestType) throws -&gt; String {
 
 var ifr = ifreq ()
 ifr.ifr_ifru.ifru_addr.sa_family = sa_family_t(AF_INET)
 
 // Copy the name into a zero padded 16 CChar buffer
 
 let ifNameSize = Int (IFNAMSIZ)
 var b = [CChar] (repeating: 0, count: ifNameSize)
 strncpy (&amp;b, name, ifNameSize)
 
 // Convert the buffer to a 16 CChar tuple - that's what ifreq needs
 ifr.ifr_name = (b [0], b [1], b [2], b [3], b [4], b [5], b [6], b [7], b [8], b [9], b [10], b [11], b [12], b [13], b [14], b [15])
 
 let ioRequest: UInt32 = {
 switch requestType {
 case .ipAddress: return _IOWR(&quot;i&quot;, 33, UInt32(MemoryLayout&lt;ifreq&gt;.size)) // Magic number SIOCGIFADDR - see sockio.h
 case .netmask: return _IOWR(&quot;i&quot;, 37, UInt32(MemoryLayout&lt;ifreq&gt;.size)) // Magic number SIOCGIFNETMASK
 }
 } ()
 
 if ioctl(socket(AF_INET, SOCK_DGRAM, 0), UInt(ioRequest), &amp;ifr) &lt; 0 {
 throw POSIXError (POSIXErrorCode (rawValue: errno) ?? POSIXErrorCode.EINVAL)
 }
 
 let sin = unsafeBitCast(ifr.ifr_ifru.ifru_addr, to: sockaddr_in.self)
 let rv = String (cString: inet_ntoa (sin.sin_addr))
 
 return rv
}

public static func getInterfaceIPAddress (interfaceName: String) throws -&gt; String {
 return try _interfaceAddressForName(interfaceName, .ipAddress)
}

public static func getInterfaceNetMask (interfaceName: String) throws -&gt; String {
 return try _interfaceAddressForName(interfaceName, .netmask)
}
</code></pre>

How do i get my local IpAddress?

I tried to use this <code>Obj C</code> example: <a href="https://stackoverflow.com/questions/6807788/how-to-get-ip-address-of-iphone-programatically">how to get ip address of iphone programmatically</a>

When i get to the function <code>getifaddrs()</code> i can't get any further. i can't use the function.

Is there an alternative way to do this, or am I approaching this the wrong way?

How to get Ip address in swift

Swift

Xcode

如何获取本地IpAddress？我尝试使用这个Obj C示例：当我到达函数getifaddrs()时，我不能再继续下去了。我不能使用这个函数。有没有其他方法可以做到这一点，或者我的方法是错误的？

问如何在swift中获取Ip地址
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