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/*
* (C) 2009-2010 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*/
#include <netinet/in.h>
#include <arpa/inet.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <strings.h>
#include <net/if.h>
#include <libmnl/libmnl.h>
#include <linux/if_link.h>
#include <linux/rtnetlink.h>
int main(int argc, char *argv[])
{
if (argc <= 3) {
printf("Usage: %s iface destination cidr [gateway]\n", argv[0]);
printf("Example: %s eth0 10.0.1.12 32 10.0.1.11\n", argv[0]);
exit(EXIT_FAILURE);
}
int iface;
iface = if_nametoindex(argv[1]);
if (iface == 0) {
printf("Bad interface name\n");
exit(EXIT_FAILURE);
}
in_addr_t dst;
if (!inet_pton(AF_INET, argv[2], &dst)) {
printf("Bad destination\n");
exit(EXIT_FAILURE);
}
uint32_t mask;
if (sscanf(argv[3], "%u", &mask) == 0) {
printf("Bad CIDR\n");
exit(EXIT_FAILURE);
}
in_addr_t gw;
if (argc >= 5 && !inet_pton(AF_INET, argv[4], &gw)) {
printf("Bad gateway\n");
exit(EXIT_FAILURE);
}
struct mnl_socket *nl;
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
struct rtmsg *rtm;
nlh = mnl_nlmsg_put_header(buf);
nlh->nlmsg_type = RTM_NEWROUTE;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE;
nlh->nlmsg_seq = time(NULL);
rtm = mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtmsg));
rtm->rtm_family = AF_INET;
rtm->rtm_dst_len = mask;
rtm->rtm_src_len = 0;
rtm->rtm_tos = 0;
rtm->rtm_protocol = RTPROT_BOOT;
rtm->rtm_table = RT_TABLE_MAIN;
rtm->rtm_type = RTN_UNICAST;
/* is there any gateway? */
rtm->rtm_scope = (argc == 4) ? RT_SCOPE_LINK : RT_SCOPE_UNIVERSE;
rtm->rtm_flags = 0;
mnl_attr_put_u32(nlh, RTA_DST, dst);
mnl_attr_put_u32(nlh, RTA_OIF, iface);
if (argc >= 5)
mnl_attr_put_u32(nlh, RTA_GATEWAY, gw);
nl = mnl_socket_open(NETLINK_ROUTE);
if (nl == NULL) {
perror("mnl_socket_open");
exit(EXIT_FAILURE);
}
if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
perror("mnl_socket_bind");
exit(EXIT_FAILURE);
}
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
perror("mnl_socket_send");
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
return 0;
}
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