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@phoboslab
Created July 10, 2013 16:32
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Get Wifi or Public IP on the iPhone. Works with iOS7
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <net/if.h>
void ip_for_interface(const char *interface_name, char *ip, const int length) {
*ip = NULL;
int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if( sockfd < 0 ) {
return;
}
struct ifconf ifc;
ifc.ifc_len = 1024;
ifc.ifc_buf = malloc(ifc.ifc_len);
if( ioctl(sockfd, SIOCGIFCONF, &ifc ) < 0 ) {
free(ifc.ifc_buf);
return;
}
for( char *current = ifc.ifc_buf; current < ifc.ifc_buf + ifc.ifc_len; ) {
struct ifreq *request = (struct ifreq *)current;
current += sizeof(request->ifr_name) +
(sizeof(struct sockaddr) > request->ifr_addr.sa_len
? sizeof(struct sockaddr)
: request->ifr_addr.sa_len);
if( request->ifr_addr.sa_family == AF_INET && strcmp(request->ifr_name, interface_name) == 0 ) {
struct sockaddr_in *sin = (struct sockaddr_in *)&request->ifr_addr;
strncpy(ip, inet_ntoa(sin->sin_addr), length);
break;
}
}
close(sockfd);
free(ifc.ifc_buf);
}
-(NSString *)getIPAddress {
char addr[32];
ip_for_interface("en0", addr, 32); // public: "pdp_ip0", local: "lo0"
return addr ? [NSString stringWithUTF8String:addr] : @"error";
}
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