| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <time.h> |
| #include <arpa/inet.h> |
| |
| #include <libmnl/libmnl.h> |
| #include <libnetfilter_conntrack/libnetfilter_conntrack.h> |
| |
| static int data_cb(const struct nlmsghdr *nlh, void *data) |
| { |
| struct nf_expect *exp; |
| uint32_t type = NFCT_T_UNKNOWN; |
| char buf[4096]; |
| |
| exp = nfexp_new(); |
| if (exp == NULL) |
| return MNL_CB_OK; |
| |
| if (nfexp_nlmsg_parse(nlh, exp) < 0) { |
| perror("failed to parse message from kernel"); |
| return MNL_CB_ERROR; |
| } |
| |
| nfexp_snprintf(buf, sizeof(buf), exp, type, NFCT_O_DEFAULT, 0); |
| printf("%s\n", buf); |
| |
| nfexp_destroy(exp); |
| |
| return MNL_CB_OK; |
| } |
| |
| int main(void) |
| { |
| struct mnl_socket *nl; |
| char buf[MNL_SOCKET_BUFFER_SIZE]; |
| struct nlmsghdr *nlh; |
| struct nfgenmsg *nfh; |
| uint32_t seq, portid; |
| int ret; |
| |
| nl = mnl_socket_open(NETLINK_NETFILTER); |
| 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); |
| |
| nlh = mnl_nlmsg_put_header(buf); |
| nlh->nlmsg_type = (NFNL_SUBSYS_CTNETLINK_EXP << 8) | IPCTNL_MSG_EXP_GET; |
| nlh->nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP|NLM_F_ACK; |
| nlh->nlmsg_seq = seq = time(NULL); |
| |
| nfh = mnl_nlmsg_put_extra_header(nlh, sizeof(struct nfgenmsg)); |
| nfh->nfgen_family = AF_INET; |
| nfh->version = NFNETLINK_V0; |
| nfh->res_id = 0; |
| |
| ret = mnl_socket_sendto(nl, nlh, nlh->nlmsg_len); |
| if (ret == -1) { |
| perror("mnl_socket_recvfrom"); |
| exit(EXIT_FAILURE); |
| } |
| |
| ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); |
| while (1) { |
| 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("mnl_socket_recvfrom"); |
| exit(EXIT_FAILURE); |
| } |
| |
| mnl_socket_close(nl); |
| |
| return 0; |
| } |