1 /*
2 * src/nf-monitor.c Monitor netfilter events
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
7 * of the License.
8 *
9 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
10 * Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
11 * Copyright (c) 2007 Secure Computing Corporation
12 */
13
14 #include <netlink/cli/utils.h>
15 #include <netlink/netfilter/nfnl.h>
16
obj_input(struct nl_object * obj,void * arg)17 static void obj_input(struct nl_object *obj, void *arg)
18 {
19 struct nl_dump_params dp = {
20 .dp_type = NL_DUMP_STATS,
21 .dp_fd = stdout,
22 .dp_dump_msgtype = 1,
23 };
24
25 nl_object_dump(obj, &dp);
26 }
27
event_input(struct nl_msg * msg,void * arg)28 static int event_input(struct nl_msg *msg, void *arg)
29 {
30 if (nl_msg_parse(msg, &obj_input, NULL) < 0)
31 fprintf(stderr, "<<EVENT>> Unknown message type\n");
32
33 /* Exit nl_recvmsgs_def() and return to the main select() */
34 return NL_STOP;
35 }
36
main(int argc,char * argv[])37 int main(int argc, char *argv[])
38 {
39 struct nl_sock *sock;
40 int err;
41 int i, idx;
42
43 static const struct {
44 enum nfnetlink_groups gr_id;
45 const char* gr_name;
46 } groups[] = {
47 { NFNLGRP_CONNTRACK_NEW, "ct-new" },
48 { NFNLGRP_CONNTRACK_UPDATE, "ct-update" },
49 { NFNLGRP_CONNTRACK_DESTROY, "ct-destroy" },
50 { NFNLGRP_NONE, NULL }
51 };
52
53 sock = nl_cli_alloc_socket();
54 nl_socket_disable_seq_check(sock);
55 nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, event_input, NULL);
56
57 if (argc > 1 && !strcasecmp(argv[1], "-h")) {
58 printf("Usage: nf-monitor [<groups>]\n");
59
60 printf("Known groups:");
61 for (i = 0; groups[i].gr_id != NFNLGRP_NONE; i++)
62 printf(" %s", groups[i].gr_name);
63 printf("\n");
64 return 2;
65 }
66
67 nl_cli_connect(sock, NETLINK_NETFILTER);
68
69 for (idx = 1; argc > idx; idx++) {
70 for (i = 0; groups[i].gr_id != NFNLGRP_NONE; i++) {
71 if (strcmp(argv[idx], groups[i].gr_name))
72 continue;
73
74 err = nl_socket_add_membership(sock, groups[i].gr_id);
75 if (err < 0)
76 nl_cli_fatal(err,
77 "Unable to add membership: %s",
78 nl_geterror(err));
79 break;
80 }
81
82 if (groups[i].gr_id == NFNLGRP_NONE)
83 nl_cli_fatal(NLE_OBJ_NOTFOUND, "Unknown group: \"%s\"",
84 argv[idx]);
85 }
86
87 while (1) {
88 fd_set rfds;
89 int fd, retval;
90
91 fd = nl_socket_get_fd(sock);
92
93 FD_ZERO(&rfds);
94 FD_SET(fd, &rfds);
95 /* wait for an incoming message on the netlink socket */
96 retval = select(fd+1, &rfds, NULL, NULL, NULL);
97
98 if (retval) {
99 /* FD_ISSET(fd, &rfds) will be true */
100 nl_recvmsgs_default(sock);
101 }
102 }
103
104 return 0;
105 }
106