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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <libmnl/libmnl.h>
#include <linux/genetlink.h>
static void parse_genl_mc_grps(struct nlattr *nested)
{
struct nlattr *pos;
int len;
mnl_attr_for_each_nested(pos, nested, len) {
struct nlattr *tb[CTRL_ATTR_MCAST_GRP_MAX+1];
mnl_attr_parse_nested(pos, tb, CTRL_ATTR_MCAST_GRP_MAX);
if (tb[CTRL_ATTR_MCAST_GRP_ID]) {
printf("id-0x%x ",
mnl_attr_get_u32(tb[CTRL_ATTR_MCAST_GRP_ID]));
}
if (tb[CTRL_ATTR_MCAST_GRP_NAME]) {
printf("name: %s ",
mnl_attr_get_str(tb[CTRL_ATTR_MCAST_GRP_NAME]));
}
printf("\n");
}
}
static void parse_genl_family_ops(struct nlattr *nested)
{
struct nlattr *pos;
int len;
mnl_attr_for_each_nested(pos, nested, len) {
struct nlattr *tb[CTRL_ATTR_OP_MAX+1];
mnl_attr_parse_nested(pos, tb, CTRL_ATTR_OP_MAX);
if (tb[CTRL_ATTR_OP_ID]) {
printf("id-0x%x ",
mnl_attr_get_u32(tb[CTRL_ATTR_OP_ID]));
}
if (tb[CTRL_ATTR_OP_MAX]) {
printf("flags ");
}
printf("\n");
}
}
static int data_cb(const struct nlmsghdr *nlh, void *data)
{
struct nlattr *tb[CTRL_ATTR_MAX+1];
struct genlmsghdr *genl = mnl_nlmsg_get_data(nlh);
mnl_attr_parse_at_offset(nlh, sizeof(*genl), tb, CTRL_ATTR_MAX);
if (tb[CTRL_ATTR_FAMILY_NAME]) {
printf("name=%s\t",
mnl_attr_get_str(tb[CTRL_ATTR_FAMILY_NAME]));
}
if (tb[CTRL_ATTR_FAMILY_ID]) {
printf("id=%u\t",
mnl_attr_get_u16(tb[CTRL_ATTR_FAMILY_ID]));
}
if (tb[CTRL_ATTR_VERSION]) {
printf("version=%u\t",
mnl_attr_get_u32(tb[CTRL_ATTR_VERSION]));
}
if (tb[CTRL_ATTR_HDRSIZE]) {
printf("hdrsize=%u\t",
mnl_attr_get_u32(tb[CTRL_ATTR_HDRSIZE]));
}
if (tb[CTRL_ATTR_MAXATTR]) {
printf("maxattr=%u\t",
mnl_attr_get_u32(tb[CTRL_ATTR_MAXATTR]));
}
if (tb[CTRL_ATTR_OPS]) {
printf("\nops:\n");
parse_genl_family_ops(tb[CTRL_ATTR_OPS]);
}
if (tb[CTRL_ATTR_MCAST_GROUPS]) {
printf("\ngrps:\n");
parse_genl_mc_grps(tb[CTRL_ATTR_MCAST_GROUPS]);
}
return MNL_CB_OK;
}
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
char buf[getpagesize()];
struct nlmsghdr *nlh;
struct genlmsghdr *genl;
int ret;
unsigned int seq;
if (argc != 2) {
printf("%s [family name]\n", argv[0]);
exit(EXIT_FAILURE);
}
nlh = mnl_nlmsg_put_header(buf);
nlh->nlmsg_type = GENL_ID_CTRL;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
nlh->nlmsg_seq = seq = time(NULL);
genl = mnl_nlmsg_put_extra_header(nlh, sizeof(struct genlmsghdr));
genl->cmd = CTRL_CMD_GETFAMILY;
genl->version = 1;
mnl_attr_put_u32(nlh, CTRL_ATTR_FAMILY_ID, GENL_ID_CTRL);
mnl_attr_put_str_null(nlh, CTRL_ATTR_FAMILY_NAME, argv[1]);
nl = mnl_socket_open(NETLINK_GENERIC);
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, mnl_nlmsg_get_len(nlh)) < 0) {
perror("mnl_socket_send");
exit(EXIT_FAILURE);
}
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, seq, data_cb, NULL);
if (ret <= 0)
break;
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
}
if (ret == -1) {
perror("error");
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
return 0;
}
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