#include #include #include #include #include #include #include static int data_cb(const struct nlmsghdr *nlh, void *data) { struct ifinfomsg *ifm = mnl_nlmsg_get_data(nlh); int len = mnl_nlmsg_get_len(nlh); struct nlattr *attr; printf("index=%d type=%d flags=%d family=%d ", ifm->ifi_index, ifm->ifi_type, ifm->ifi_flags, ifm->ifi_family); if (ifm->ifi_flags & IFF_RUNNING) printf("[RUNNING] "); else printf("[NOT RUNNING] "); mnl_attr_for_each(attr, nlh, sizeof(*ifm)) { int type = mnl_attr_get_type(attr); if (mnl_attr_type_invalid(attr, IFLA_MAX) < 0) { perror("mnl_attr_type_invalid"); return MNL_CB_ERROR; } switch(type) { case IFLA_MTU: if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) { perror("mnl_attr_validate"); return MNL_CB_ERROR; } printf("mtu=%d ", mnl_attr_get_u32(attr)); break; case IFLA_IFNAME: if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) { perror("mnl_attr_validate"); return MNL_CB_ERROR; } printf("name=%s ", mnl_attr_get_str(attr)); break; } } printf("\n"); return MNL_CB_OK; } int main() { struct mnl_socket *nl; char buf[getpagesize()]; struct nlmsghdr *nlh; struct rtgenmsg *rt; int ret; unsigned int seq, portid; nlh = mnl_nlmsg_put_header(buf); nlh->nlmsg_type = RTM_GETLINK; nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP; nlh->nlmsg_seq = seq = time(NULL); rt = mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtgenmsg)); rt->rtgen_family = AF_PACKET; 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); } portid = mnl_socket_get_portid(nl); 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, portid, data_cb, NULL); if (ret <= MNL_CB_STOP) break; ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); } if (ret == -1) { perror("error"); exit(EXIT_FAILURE); } mnl_socket_close(nl); return 0; }