1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <time.h> 4 5 #include <libmnl/libmnl.h> 6 #include <libnetfilter_conntrack/libnetfilter_conntrack.h> 7 8 static void print_label(struct nf_conntrack *ct, struct nfct_labelmap *map) 9 { 10 unsigned int i, max; 11 const struct nfct_bitmask *b = nfct_get_attr(ct, ATTR_CONNLABELS); 12 if (!b) 13 return; 14 15 puts("labels:"); 16 max = nfct_bitmask_maxbit(b); 17 for (i = 0; i <= max; i++) { 18 if (nfct_bitmask_test_bit(b, i)) 19 printf("\t'%s' (%d)\n", map ? nfct_labelmap_get_name(map, i) : "", i); 20 } 21 } 22 23 static int data_cb(const struct nlmsghdr *nlh, void *data) 24 { 25 struct nf_conntrack *ct; 26 char buf[4096]; 27 28 ct = nfct_new(); 29 if (ct == NULL) 30 return MNL_CB_OK; 31 32 nfct_nlmsg_parse(nlh, ct); 33 34 nfct_snprintf(buf, sizeof(buf), ct, NFCT_T_UNKNOWN, NFCT_O_DEFAULT, 0); 35 printf("%s\n", buf); 36 37 print_label(ct, data); 38 39 nfct_destroy(ct); 40 41 return MNL_CB_OK; 42 } 43 44 int main(void) 45 { 46 struct mnl_socket *nl; 47 struct nlmsghdr *nlh; 48 struct nfgenmsg *nfh; 49 char buf[MNL_SOCKET_BUFFER_SIZE]; 50 unsigned int seq, portid; 51 int ret; 52 struct nfct_labelmap *l = nfct_labelmap_new(NULL); 53 54 nl = mnl_socket_open(NETLINK_NETFILTER); 55 if (nl == NULL) { 56 perror("mnl_socket_open"); 57 exit(EXIT_FAILURE); 58 } 59 60 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { 61 perror("mnl_socket_bind"); 62 exit(EXIT_FAILURE); 63 } 64 portid = mnl_socket_get_portid(nl); 65 66 nlh = mnl_nlmsg_put_header(buf); 67 nlh->nlmsg_type = (NFNL_SUBSYS_CTNETLINK << 8) | IPCTNL_MSG_CT_GET; 68 nlh->nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP; 69 nlh->nlmsg_seq = seq = time(NULL); 70 71 nfh = mnl_nlmsg_put_extra_header(nlh, sizeof(struct nfgenmsg)); 72 nfh->nfgen_family = AF_UNSPEC; 73 nfh->version = NFNETLINK_V0; 74 nfh->res_id = 0; 75 76 77 ret = mnl_socket_sendto(nl, nlh, nlh->nlmsg_len); 78 if (ret == -1) { 79 perror("mnl_socket_sendto"); 80 exit(EXIT_FAILURE); 81 } 82 83 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); 84 85 86 while (ret > 0) { 87 ret = mnl_cb_run(buf, ret, seq, portid, data_cb, l); 88 if (ret <= MNL_CB_STOP) 89 break; 90 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); 91 } 92 if (ret == -1) { 93 perror("mnl_socket_recvfrom"); 94 exit(EXIT_FAILURE); 95 } 96 97 if (l) 98 nfct_labelmap_destroy(l); 99 100 mnl_socket_close(nl); 101 102 return 0; 103 } 104
