struct nl_addr *
rtnl_route_get_gateway (struct rtnl_route * route)
{
struct rtnl_nexthop * nh;
nh = nm_netlink_get_nh(route);
g_return_val_if_fail(nh, NULL);
return rtnl_route_nh_get_gateway(nh);
}
static void get_route(struct nl_object *obj, void *arg)
{
struct rtnl_route *route = (struct rtnl_route *) obj;
struct rtnl_nexthop * nexthop = rtnl_route_nexthop_n(route, 0);
struct nl_addr *naddr = rtnl_route_nh_get_gateway(nexthop);
if (NULL != naddr)
printf("gwip is 0x%x\n", *(uint32_t *) (nl_addr_get_binary_addr(naddr)));
}
static void match_first_nh_gw(struct nl_object *obj, void *arg)
{
static int found = 0;
struct rtnl_route *route = (struct rtnl_route *)obj;
struct nl_addr **gw = (struct nl_addr **)arg;
if (found)
return;
struct rtnl_nexthop *nh = rtnl_route_nexthop_n(route, 0);
if (nh == NULL)
return;
*gw = rtnl_route_nh_get_gateway(nh);
nl_addr_get(*gw); /* Found, keep reference */
found = 1;
}
CAMLprim value
ocaml_get_routing_table(value unit) {
CAMLparam1(unit);
CAMLlocal3( ret, tmp, entry );
struct nl_sock *fd;
struct nl_cache *res, *links;
struct rtnl_route *it;
uint32 i_ip, netmask = 0, mask_len, gw;
int i;
struct nl_addr *ip;
char device_name[IFNAMSIZ];
struct rtnl_nexthop *to;
fd = nl_socket_alloc();
if (!fd) {
fprintf(stderr, "error nl_socket_alloc\n");
exit(1);
}
if(nl_connect(fd, NETLINK_ROUTE) < 0) {
fprintf(stderr, "error nl_connect\n");
exit(1);
}
ret = Val_emptylist;
if(rtnl_route_alloc_cache(fd, AF_UNSPEC, 0, &res) < 0) {
fprintf(stderr, "error rtnl_route_alloc_cache");
exit(1);
}
if(rtnl_link_alloc_cache (fd, AF_UNSPEC, &links) < 0) {
fprintf(stderr, "error rtnl_link_alloc_cache");
exit(1);
}
it = (struct rtnl_route *)nl_cache_get_first(res);
for(; it != NULL; it = (struct rtnl_route *)
nl_cache_get_next((struct nl_object *)it) ) {
if(rtnl_route_get_family (it) == AF_INET) {
ip = rtnl_route_get_dst(it);
i_ip = ntohl(*(int *)nl_addr_get_binary_addr(ip));
mask_len = nl_addr_get_prefixlen(ip);
for(i = 0; i < 32; i++)
netmask = (netmask << 1) + (i< mask_len?1:0);
to = rtnl_route_nexthop_n(it, 0);
rtnl_link_i2name(links, rtnl_route_nh_get_ifindex(to),
device_name, IFNAMSIZ);
if ( rtnl_route_nh_get_gateway (to) != NULL)
gw = ntohl(*(int *)nl_addr_get_binary_addr(
rtnl_route_nh_get_gateway (to)));
else
gw = 0;
/*printf("src ip:%x mask:%x gw:%x dev:%s\n", i_ip, netmask, */
/*gw, device_name);*/
entry = caml_alloc(7,0);
Store_field(entry, 0, Val_int(i_ip & 0xFFFF));
Store_field(entry, 1, Val_int(i_ip >> 16));
Store_field(entry, 2, Val_int(netmask & 0xFFFF));
Store_field(entry, 3, Val_int(netmask >> 16));
Store_field(entry, 4, Val_int(gw & 0xFFFF));
Store_field(entry, 5, Val_int(gw >> 16));
Store_field(entry, 6, caml_copy_string(device_name));
// store in list
tmp = caml_alloc(2, 0);
Store_field( tmp, 0, entry); // head
Store_field( tmp, 1, ret); // tail
ret = tmp;
}
}