18a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <stdio.h> 28a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <stdlib.h> 38a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <unistd.h> 48a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <arpa/inet.h> 58a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 68a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <libmnl/libmnl.h> 78a44513648da0c5f5551f96b329cf56b66f5b303pkanwar#include <libnetfilter_conntrack/libnetfilter_conntrack.h> 88a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 98a44513648da0c5f5551f96b329cf56b66f5b303pkanwarstatic int data_cb(const struct nlmsghdr *nlh, void *data) 108a44513648da0c5f5551f96b329cf56b66f5b303pkanwar{ 118a44513648da0c5f5551f96b329cf56b66f5b303pkanwar struct nf_expect *exp; 128a44513648da0c5f5551f96b329cf56b66f5b303pkanwar uint32_t type = NFCT_T_UNKNOWN; 138a44513648da0c5f5551f96b329cf56b66f5b303pkanwar char buf[4096]; 148a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 158a44513648da0c5f5551f96b329cf56b66f5b303pkanwar switch(nlh->nlmsg_type & 0xFF) { 168a44513648da0c5f5551f96b329cf56b66f5b303pkanwar case IPCTNL_MSG_EXP_NEW: 178a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (nlh->nlmsg_flags & (NLM_F_CREATE|NLM_F_EXCL)) 188a44513648da0c5f5551f96b329cf56b66f5b303pkanwar type = NFCT_T_NEW; 198a44513648da0c5f5551f96b329cf56b66f5b303pkanwar else 208a44513648da0c5f5551f96b329cf56b66f5b303pkanwar type = NFCT_T_UPDATE; 218a44513648da0c5f5551f96b329cf56b66f5b303pkanwar break; 228a44513648da0c5f5551f96b329cf56b66f5b303pkanwar case IPCTNL_MSG_EXP_DELETE: 238a44513648da0c5f5551f96b329cf56b66f5b303pkanwar type = NFCT_T_DESTROY; 248a44513648da0c5f5551f96b329cf56b66f5b303pkanwar break; 258a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 268a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 278a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exp = nfexp_new(); 288a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (exp == NULL) 298a44513648da0c5f5551f96b329cf56b66f5b303pkanwar return MNL_CB_OK; 308a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 318a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfexp_nlmsg_parse(nlh, exp); 328a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 338a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfexp_snprintf(buf, sizeof(buf), exp, 348a44513648da0c5f5551f96b329cf56b66f5b303pkanwar type, NFCT_O_DEFAULT, 0); 358a44513648da0c5f5551f96b329cf56b66f5b303pkanwar printf("%s\n", buf); 368a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 378a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nfexp_destroy(exp); 388a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 398a44513648da0c5f5551f96b329cf56b66f5b303pkanwar return MNL_CB_OK; 408a44513648da0c5f5551f96b329cf56b66f5b303pkanwar} 418a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 428a44513648da0c5f5551f96b329cf56b66f5b303pkanwarint main(void) 438a44513648da0c5f5551f96b329cf56b66f5b303pkanwar{ 448a44513648da0c5f5551f96b329cf56b66f5b303pkanwar struct mnl_socket *nl; 458a44513648da0c5f5551f96b329cf56b66f5b303pkanwar char buf[MNL_SOCKET_BUFFER_SIZE]; 468a44513648da0c5f5551f96b329cf56b66f5b303pkanwar int ret; 478a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 488a44513648da0c5f5551f96b329cf56b66f5b303pkanwar nl = mnl_socket_open(NETLINK_NETFILTER); 498a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (nl == NULL) { 508a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_socket_open"); 518a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 528a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 538a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 548a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (mnl_socket_bind(nl, NF_NETLINK_CONNTRACK_EXP_NEW | 558a44513648da0c5f5551f96b329cf56b66f5b303pkanwar NF_NETLINK_CONNTRACK_EXP_UPDATE | 568a44513648da0c5f5551f96b329cf56b66f5b303pkanwar NF_NETLINK_CONNTRACK_EXP_DESTROY, 578a44513648da0c5f5551f96b329cf56b66f5b303pkanwar MNL_SOCKET_AUTOPID) < 0) { 588a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_socket_bind"); 598a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 608a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 618a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 628a44513648da0c5f5551f96b329cf56b66f5b303pkanwar while (1) { 638a44513648da0c5f5551f96b329cf56b66f5b303pkanwar ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); 648a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (ret == -1) { 658a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_socket_recvfrom"); 668a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 678a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 688a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 698a44513648da0c5f5551f96b329cf56b66f5b303pkanwar ret = mnl_cb_run(buf, ret, 0, 0, data_cb, NULL); 708a44513648da0c5f5551f96b329cf56b66f5b303pkanwar if (ret == -1) { 718a44513648da0c5f5551f96b329cf56b66f5b303pkanwar perror("mnl_cb_run"); 728a44513648da0c5f5551f96b329cf56b66f5b303pkanwar exit(EXIT_FAILURE); 738a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 748a44513648da0c5f5551f96b329cf56b66f5b303pkanwar } 758a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 768a44513648da0c5f5551f96b329cf56b66f5b303pkanwar mnl_socket_close(nl); 778a44513648da0c5f5551f96b329cf56b66f5b303pkanwar 788a44513648da0c5f5551f96b329cf56b66f5b303pkanwar return 0; 798a44513648da0c5f5551f96b329cf56b66f5b303pkanwar} 80