How can I determine the default gateway on iPhone?

Question

I need to obtain the IP address of the default gateway in an iPhone application. I cannot find the proper API. Anyone know if iPhone exposes this information?

Answer 1

for those who need human readable IP, i modified my getgateway.c as follow:

add to includes:

#include 

inside the last if statement, between *addr and r=0;

if(strcmp("en0",ifName)==0){

*addr = ((struct sockaddr_in *)(sa_tab[RTAX_GATEWAY]))->sin_addr.s_addr;

char str[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &(((struct sockaddr_in *)(sa_tab[RTAX_GATEWAY]))->sin_addr.s_addr), str, INET_ADDRSTRLEN); // supports IPv6
printf("IP: %s\n", str); // prints "192.0.2.33"

r = 0;
}