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Add default gateway route using ioctl
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <net/route.h>
#include <sys/types.h>
#include <sys/ioctl.h>
int main(char** args) {
int sockfd;
struct rtentry route;
struct sockaddr_in *addr;
int err = 0;
// create the socket
if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)))<0){
perror("socket");
exit(1);
}
memset(&route, 0, sizeof(route));
addr = (struct sockaddr_in*) &route.rt_gateway;
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = inet_addr("192.168.2.1");
addr = (struct sockaddr_in*) &route.rt_dst;
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = INADDR_ANY;
addr = (struct sockaddr_in*) &route.rt_genmask;
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = INADDR_ANY;
// TODO Add the interface name to the request
route.rt_flags = RTF_UP | RTF_GATEWAY;
route.rt_metric = 0;
if ((err = ioctl(sockfd, SIOCADDRT, &route)) != 0) {
perror("SIOCADDRT failed");
exit(1);
}
}
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