Obtains the current IP address of an iOS device.

 

The first method is to use the system api, as shown below:

# Include <stdio. h>

# Include <stdlib. h>

# Include <string. h>

# Include <unistd. h>

# Include <sys/ioctl. h>

# Include <sys/types. h>

# Include <sys/socket. h>

# Include <netinet/in. h>

# Include <netdb. h>

# Include <arpa/inet. h>

# Include <sys/sockio. h>

# Include <net/if. h>

# Include <errno. h>

# Include <net/if_dl.h>

 

// # Include "GetAddresses. h"

 

# Define min (a, B) (a) <(B )? (A): (B ))

# Define max (a, B) (a)> (B )? (A): (B ))

 

# Define BUFFERSIZE 4000

 

Char * if_names [MAXADDRS];

Char * ip_names [MAXADDRS];

Char * hw_addrs [MAXADDRS];

Unsigned long ip_addrs [MAXADDRS];

 

Static int nextAddr = 0;

 

Void InitAddresses ()

{

Int I;

For (I = 0; I <MAXADDRS; ++ I)

{

If_names [I] = ip_names [I] = hw_addrs [I] = NULL;

Ip_addrs [I] = 0;

}

}

 

Void FreeAddresses ()

{

Int I;

For (I = 0; I <MAXADDRS; ++ I)

{

If (if_names [I]! = 0) free (if_names [I]);

If (ip_names [I]! = 0) free (ip_names [I]);

If (hw_addrs [I]! = 0) free (hw_addrs [I]);

Ip_addrs [I] = 0;

}

InitAddresses ();

}

 

Void GetIPAddresses ()

{

Int I, len, flags;

Char buffer [BUFFERSIZE], * ptr, lastname [IFNAMSIZ], * cptr;

Struct ifconf ifc;

Struct ifreq * ifr, ifrcopy;

Struct sockaddr_in * sin;

Char temp [80];

Int sockfd;

For (I = 0; I <MAXADDRS; ++ I)

{

If_names [I] = ip_names [I] = NULL;

Ip_addrs [I] = 0;

}

Sockfd = socket (AF_INET, SOCK_DGRAM, 0 );

If (sockfd <0)

{

Perror ("socket failed ");

Return;

}

Ifc. ifc_len = BUFFERSIZE;

Ifc. ifc_buf = buffer;

If (ioctl (sockfd, SIOCGIFCONF, & ifc) <0)

{

Perror ("ioctl error ");

Return;

}

Lastname [0] = 0;

For (ptr = buffer; ptr <buffer + ifc. ifc_len ;)

{

Ifr = (struct ifreq *) ptr;

Len = max (sizeof (struct sockaddr), ifr-> ifr_addr.sa_len );

Ptr + = sizeof (ifr-> ifr_name) + len; // for next one in buffer

If (ifr-> ifr_addr.sa_family! = AF_INET)

{

Continue; // ignore if not desired address family

}

If (cptr = (char *) strchr (ifr-> ifr_name ,':'))! = NULL)

{

* Cptr = 0; // replace colon will null

}

If (strncmp (lastname, ifr-> ifr_name, IFNAMSIZ) = 0)

{

Continue;/* already processed this interface */

}

Memcpy (lastname, ifr-> ifr_name, IFNAMSIZ );

Ifrcopy = * ifr;

Ioctl (sockfd, SIOCGIFFLAGS, & ifrcopy );

Flags = ifrcopy. ifr_flags;

If (flags & IFF_UP) = 0)

{

Continue; // ignore if interface not up

}

If_names [nextAddr] = (char *) malloc (strlen (ifr-> ifr_name) + 1 );

If (if_names [nextAddr] = NULL)

{

Return;

}

Strcpy (if_names [nextAddr], ifr-> ifr_name );

Sin = (struct sockaddr_in *) & ifr-> ifr_addr;

Strcpy (temp, inet_ntoa (sin-> sin_addr ));

Ip_names [nextAddr] = (char *) malloc (strlen (temp) + 1 );

If (ip_names [nextAddr] = NULL)

{

Return;

}

Strcpy (ip_names [nextAddr], temp );

Ip_addrs [nextAddr] = sin-> sin_addr.s_addr;

++ NextAddr;

}

Close (sockfd );

}

 

Void GetHWAddresses ()

{

Struct ifconf ifc;

Struct ifreq * ifr;

Int I, sockfd;

Char buffer [BUFFERSIZE], * cp, * cplim;

Char temp [80];

For (I = 0; I <MAXADDRS; ++ I)

{

Hw_addrs [I] = NULL;

}

Sockfd = socket (AF_INET, SOCK_DGRAM, 0 );

If (sockfd <0)

{

Perror ("socket failed ");

Return;

}

Ifc. ifc_len = BUFFERSIZE;

Ifc. ifc_buf = buffer;

If (ioctl (sockfd, SIOCGIFCONF, (char *) & ifc) <0)

{

Perror ("ioctl error ");

Close (sockfd );

Return;

}

Ifr = ifc. ifc_req;

Cplim = buffer + ifc. ifc_len;

For (cp = buffer; cp <cplim ;)

{

Ifr = (struct ifreq *) cp;

If (ifr-> ifr_addr.sa_family = AF_LINK)

{

Struct sockaddr_dl * sdl = (struct sockaddr_dl *) & ifr-> ifr_addr;

Int a, B, c, d, e, f;

Int I;

Strcpy (temp, (char *) ether_ntoa (LLADDR (sdl )));

Sscanf (temp, "% x: % x", & a, & B, & c, & d, & e, & f );

Sprintf (temp, "% 02X: % 02X: % 02X: % 02X: % 02X: % 02X", a, B, c, d, e, f );

For (I = 0; I <MAXADDRS; ++ I)

{

If (if_names [I]! = NULL) & (strcmp (ifr-> ifr_name, if_names [I]) = 0 ))

{

If (hw_addrs [I] = NULL)

{

Hw_addrs [I] = (char *) malloc (strlen (temp) + 1 );

Strcpy (hw_addrs [I], temp );

Break;

}

} Www.2cto.com

}

}

Cp + = sizeof (ifr-> ifr_name) + max (sizeof (ifr-> ifr_addr), ifr-> ifr_addr.sa_len );

}

Close (sockfd );

}

 

-(NSString *) deviceIPAdress {

InitAddresses ();

GetIPAddresses ();

GetHWAddresses ();

 

Return [NSString stringWithFormat: @ "% s", ip_names [1];

}

 

The obtained ip address is the Intranet ip address in the intranet.

The second method is to obtain the public ip address.

-(Void) getCurrentIP

{

NSURL * url = [NSURL URLWithString: @ "http://automation.whatismyip.com/n09230945.asp"];

_ Block ASIHTTPRequest * request = [ASIHTTPRequest requestWithURL: url];

[Request setCompletionBlock: ^ {

NSString * responseString = [request responseString];

If (responseString ){

NSString * ip = [NSString stringWithFormat: @ "% @", responseString];

NSLog (@ "responseString = % @", ip );

};

}];

[Request setFailedBlock: ^ {

}];

}

The Network open source library ASIHTTPRequest is used.

Http://automation.whatismyip.com/n09230945.aspthis HTTP url can get your current IP address.

Author: Ecstasy talent