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1 office 1 /*
2 * src/nf-log.c Monitor netfilter log 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/cli/link.h>
16 #include <linux/netfilter/nfnetlink_log.h>
17 #include <netlink/netfilter/nfnl.h>
18 #include <netlink/netfilter/log.h>
19  
20 static struct nfnl_log *alloc_log(void)
21 {
22 struct nfnl_log *log;
23  
24 log = nfnl_log_alloc();
25 if (!log)
26 nl_cli_fatal(ENOMEM, "Unable to allocate log object");
27  
28 return log;
29 }
30  
31 static void obj_input(struct nl_object *obj, void *arg)
32 {
33 struct nl_dump_params dp = {
34 .dp_type = NL_DUMP_STATS,
35 .dp_fd = stdout,
36 .dp_dump_msgtype = 1,
37 };
38  
39 nl_object_dump(obj, &dp);
40 }
41  
42 static int event_input(struct nl_msg *msg, void *arg)
43 {
44 if (nl_msg_parse(msg, &obj_input, NULL) < 0)
45 fprintf(stderr, "<<EVENT>> Unknown message type\n");
46  
47 /* Exit nl_recvmsgs_def() and return to the main select() */
48 return NL_STOP;
49 }
50  
51 int main(int argc, char *argv[])
52 {
53 struct nl_sock *nf_sock;
54 struct nl_sock *rt_sock;
55 struct nl_cache *link_cache;
56 struct nfnl_log *log;
57 enum nfnl_log_copy_mode copy_mode;
58 uint32_t copy_range;
59 int err;
60 int family;
61  
62 nf_sock = nl_cli_alloc_socket();
63 nl_socket_disable_seq_check(nf_sock);
64 nl_socket_modify_cb(nf_sock, NL_CB_VALID, NL_CB_CUSTOM, event_input, NULL);
65  
66 if ((argc > 1 && !strcasecmp(argv[1], "-h")) || argc < 3) {
67 printf("Usage: nf-log family group [ copy_mode ] "
68 "[copy_range] \n");
69 return 2;
70 }
71  
72 nl_cli_connect(nf_sock, NETLINK_NETFILTER);
73  
74 family = nl_str2af(argv[1]);
75 if (family == AF_UNSPEC)
76 nl_cli_fatal(NLE_INVAL, "Unknown family \"%s\": %s",
77 argv[1], nl_geterror(family));
78  
79 nfnl_log_pf_unbind(nf_sock, family);
80 if ((err = nfnl_log_pf_bind(nf_sock, family)) < 0)
81 nl_cli_fatal(err, "Unable to bind logger: %s",
82 nl_geterror(err));
83  
84 log = alloc_log();
85 nfnl_log_set_group(log, atoi(argv[2]));
86  
87 copy_mode = NFNL_LOG_COPY_META;
88 if (argc > 3) {
89 copy_mode = nfnl_log_str2copy_mode(argv[3]);
90 if (copy_mode < 0)
91 nl_cli_fatal(copy_mode,
92 "Unable to parse copy mode \"%s\": %s",
93 argv[3], nl_geterror(copy_mode));
94 }
95 nfnl_log_set_copy_mode(log, copy_mode);
96  
97 copy_range = 0xFFFF;
98 if (argc > 4)
99 copy_mode = atoi(argv[4]);
100 nfnl_log_set_copy_range(log, copy_range);
101  
102 if ((err = nfnl_log_create(nf_sock, log)) < 0)
103 nl_cli_fatal(err, "Unable to bind instance: %s",
104 nl_geterror(err));
105  
106 {
107 struct nl_dump_params dp = {
108 .dp_type = NL_DUMP_STATS,
109 .dp_fd = stdout,
110 .dp_dump_msgtype = 1,
111 };
112  
113 printf("log params: ");
114 nl_object_dump((struct nl_object *) log, &dp);
115 }
116  
117 rt_sock = nl_cli_alloc_socket();
118 nl_cli_connect(rt_sock, NETLINK_ROUTE);
119 link_cache = nl_cli_link_alloc_cache(rt_sock);
120  
121 while (1) {
122 fd_set rfds;
123 int nffd, rtfd, maxfd, retval;
124  
125 FD_ZERO(&rfds);
126  
127 maxfd = nffd = nl_socket_get_fd(nf_sock);
128 FD_SET(nffd, &rfds);
129  
130 rtfd = nl_socket_get_fd(rt_sock);
131 FD_SET(rtfd, &rfds);
132 if (maxfd < rtfd)
133 maxfd = rtfd;
134  
135 /* wait for an incoming message on the netlink nf_socket */
136 retval = select(maxfd+1, &rfds, NULL, NULL, NULL);
137  
138 if (retval) {
139 if (FD_ISSET(nffd, &rfds))
140 nl_recvmsgs_default(nf_sock);
141 if (FD_ISSET(rtfd, &rfds))
142 nl_recvmsgs_default(rt_sock);
143 }
144 }
145  
146 return 0;
147 }