18a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <stdio.h> 28a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <stdlib.h> 38a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <unistd.h> 48a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <time.h> 58a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <arpa/inet.h> 68a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 78a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <libmnl/libmnl.h> 88a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <libnetfilter_conntrack/libnetfilter_conntrack.h> 98a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 108a44513648da0c5f5551f96b329cf56b66f5b303pkanwarstatic int data_cb(const struct nlmsghdr *nlh, void *data) 118a44513648da0c5f5551f96b329cf56b66f5b303pkanwar{ 128a44513648da0c5f5551f96b329cf56b66f5b303pkanwar struct nf_expect *exp; 138a44513648da0c5f5551f96b329cf56b66f5b303pkanwar uint32_t type = NFCT_T_UNKNOWN; 148a44513648da0c5f5551f96b329cf56b66f5b303pkanwar char buf[4096]; 158a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 168a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exp = nfexp_new(); 178a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (exp == NULL) 188a44513648da0c5f5551f96b329cf56b66f5b303pkanwar return MNL_CB_OK; 198a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 208a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (nfexp_nlmsg_parse(nlh, exp) < 0) { 218a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("failed to parse message from kernel"); 228a44513648da0c5f5551f96b329cf56b66f5b303pkanwar return MNL_CB_ERROR; 238a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 248a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 258a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfexp_snprintf(buf, sizeof(buf), exp, type, NFCT_O_DEFAULT, 0); 268a44513648da0c5f5551f96b329cf56b66f5b303pkanwar printf("%s\n", buf); 278a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 288a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfexp_destroy(exp); 298a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 308a44513648da0c5f5551f96b329cf56b66f5b303pkanwar return MNL_CB_OK; 318a44513648da0c5f5551f96b329cf56b66f5b303pkanwar} 328a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 338a44513648da0c5f5551f96b329cf56b66f5b303pkanwarint main(void) 348a44513648da0c5f5551f96b329cf56b66f5b303pkanwar{ 358a44513648da0c5f5551f96b329cf56b66f5b303pkanwar struct mnl_socket *nl; 368a44513648da0c5f5551f96b329cf56b66f5b303pkanwar char buf[MNL_SOCKET_BUFFER_SIZE]; 378a44513648da0c5f5551f96b329cf56b66f5b303pkanwar struct nlmsghdr *nlh; 388a44513648da0c5f5551f96b329cf56b66f5b303pkanwar struct nfgenmsg *nfh; 398a44513648da0c5f5551f96b329cf56b66f5b303pkanwar uint32_t seq, portid; 408a44513648da0c5f5551f96b329cf56b66f5b303pkanwar int ret; 418a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 428a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nl = mnl_socket_open(NETLINK_NETFILTER); 438a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (nl == NULL) { 448a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_socket_open"); 458a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 468a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 478a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 488a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { 498a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_socket_bind"); 508a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 518a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 528a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 538a44513648da0c5f5551f96b329cf56b66f5b303pkanwar portid = mnl_socket_get_portid(nl); 548a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 558a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nlh = mnl_nlmsg_put_header(buf); 568a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nlh->nlmsg_type = (NFNL_SUBSYS_CTNETLINK_EXP << 8) | IPCTNL_MSG_EXP_GET; 578a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nlh->nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP|NLM_F_ACK; 588a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nlh->nlmsg_seq = seq = time(NULL); 598a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 608a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfh = mnl_nlmsg_put_extra_header(nlh, sizeof(struct nfgenmsg)); 618a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfh->nfgen_family = AF_INET; 628a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfh->version = NFNETLINK_V0; 638a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfh->res_id = 0; 648a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 658a44513648da0c5f5551f96b329cf56b66f5b303pkanwar ret = mnl_socket_sendto(nl, nlh, nlh->nlmsg_len); 668a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (ret == -1) { 678a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_socket_recvfrom"); 688a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 698a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 708a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 718a44513648da0c5f5551f96b329cf56b66f5b303pkanwar ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); 728a44513648da0c5f5551f96b329cf56b66f5b303pkanwar while (1) { 738a44513648da0c5f5551f96b329cf56b66f5b303pkanwar ret = mnl_cb_run(buf, ret, seq, portid, data_cb, NULL); 748a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (ret <= MNL_CB_STOP) 758a44513648da0c5f5551f96b329cf56b66f5b303pkanwar break; 768a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 778a44513648da0c5f5551f96b329cf56b66f5b303pkanwar ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); 788a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 798a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (ret == -1) { 808a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_socket_recvfrom"); 818a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 828a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 838a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 848a44513648da0c5f5551f96b329cf56b66f5b303pkanwar mnl_socket_close(nl); 858a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 868a44513648da0c5f5551f96b329cf56b66f5b303pkanwar return 0; 878a44513648da0c5f5551f96b329cf56b66f5b303pkanwar} 88