libnl: /data/src/libnl3/src/nf-log.c Source File

libnl 3.7.0

nf-log.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
4 * Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
5 * Copyright (c) 2007 Secure Computing Corporation
6 */
7
8 #include <netlink/cli/utils.h>
9 #include <netlink/cli/link.h>
10 #include <netlink/netfilter/nfnl.h>
11 #include <netlink/netfilter/log.h>
12
13 #include <linux/netfilter/nfnetlink_log.h>
14 #include <linux/netlink.h>
15
16 static struct nfnl_log *alloc_log(void)
17 {
18 struct nfnl_log *log;
19
20 log = nfnl_log_alloc();
21 if (!log)
22 nl_cli_fatal(ENOMEM, "Unable to allocate log object");
23
24 return log;
25 }
26
27 static void obj_input(struct nl_object *obj, void *arg)
28 {
29 struct nl_dump_params dp = {
30 .dp_type = NL_DUMP_STATS,
31 .dp_fd = stdout,
32 .dp_dump_msgtype = 1,
33 };
34
35 nl_object_dump(obj, &dp);
36 }
37
38 static int event_input(struct nl_msg *msg, void *arg)
39 {
40 if (nl_msg_parse(msg, &obj_input, NULL) < 0)
41 fprintf(stderr, "<<EVENT>> Unknown message type\n");
42
43 /* Exit nl_recvmsgs_def() and return to the main select() */
44 return NL_STOP;
45 }
46
47 int main(int argc, char *argv[])
48 {
49 struct nl_sock *nf_sock;
50 struct nl_sock *rt_sock;
51 struct nfnl_log *log;
52 int copy_mode;
53 uint32_t copy_range;
54 int err;
55 int family;
56
57 nf_sock = nl_cli_alloc_socket();
58 nl_socket_disable_seq_check(nf_sock);
59 nl_socket_modify_cb(nf_sock, NL_CB_VALID, NL_CB_CUSTOM, event_input, NULL);
60
61 if ((argc > 1 && !strcasecmp(argv[1], "-h")) || argc < 3) {
62 printf("Usage: nf-log family group [ copy_mode ] "
63 "[copy_range] \n");
64 return 2;
65 }
66
67 nl_cli_connect(nf_sock, NETLINK_NETFILTER);
68
69 family = nl_str2af(argv[1]);
70 if (family == AF_UNSPEC)
71 nl_cli_fatal(NLE_INVAL, "Unknown family \"%s\": %s",
72 argv[1], nl_geterror(family));
73
74 nfnl_log_pf_unbind(nf_sock, family);
75 if ((err = nfnl_log_pf_bind(nf_sock, family)) < 0)
76 nl_cli_fatal(err, "Unable to bind logger: %s",
77 nl_geterror(err));
78
79 log = alloc_log();
80 nfnl_log_set_group(log, atoi(argv[2]));
81
82 copy_mode = NFNL_LOG_COPY_META;
83 if (argc > 3) {
84 copy_mode = nfnl_log_str2copy_mode(argv[3]);
85 if (copy_mode < 0)
86 nl_cli_fatal(copy_mode,
87 "Unable to parse copy mode \"%s\": %s",
88 argv[3], nl_geterror(copy_mode));
89 }
90 nfnl_log_set_copy_mode(log, copy_mode);
91
92 copy_range = 0xFFFF;
93 if (argc > 4)
94 copy_range = atoi(argv[4]);
95 nfnl_log_set_copy_range(log, copy_range);
96
97 if ((err = nfnl_log_create(nf_sock, log)) < 0)
98 nl_cli_fatal(err, "Unable to bind instance: %s",
99 nl_geterror(err));
100
101 {
102 struct nl_dump_params dp = {
103 .dp_type = NL_DUMP_STATS,
104 .dp_fd = stdout,
105 .dp_dump_msgtype = 1,
106 };
107
108 printf("log params: ");
109 nl_object_dump((struct nl_object *) log, &dp);
110 }
111
112 rt_sock = nl_cli_alloc_socket();
113 nl_cli_connect(rt_sock, NETLINK_ROUTE);
114 nl_cli_link_alloc_cache(rt_sock);
115
116 while (1) {
117 fd_set rfds;
118 int nffd, rtfd, maxfd, retval;
119
120 FD_ZERO(&rfds);
121
122 maxfd = nffd = nl_socket_get_fd(nf_sock);
123 FD_SET(nffd, &rfds);
124
125 rtfd = nl_socket_get_fd(rt_sock);
126 FD_SET(rtfd, &rfds);
127 if (maxfd < rtfd)
128 maxfd = rtfd;
129
130 /* wait for an incoming message on the netlink nf_socket */
131 retval = select(maxfd+1, &rfds, NULL, NULL, NULL);
132
133 if (retval) {
134 if (FD_ISSET(nffd, &rfds))
135 nl_recvmsgs_default(nf_sock);
136 if (FD_ISSET(rtfd, &rfds))
137 nl_recvmsgs_default(rt_sock);
138 }
139 }
140
141 return 0;
142 }
NL_STOP
@ NL_STOP
Stop parsing altogether and discard remaining messages.
Definition: handlers.h:62
NL_CB_VALID
@ NL_CB_VALID
Message is valid.
Definition: handlers.h:89
NL_CB_CUSTOM
@ NL_CB_CUSTOM
Customized handler specified by the user.
Definition: handlers.h:77
nl_cli_fatal
void nl_cli_fatal(int err, const char *fmt,...)
Print error message and quit application.
Definition: utils.c:71
nl_object_dump
void nl_object_dump(struct nl_object *obj, struct nl_dump_params *params)
Dump this object according to the specified parameters.
Definition: object.c:287
nl_recvmsgs_default
int nl_recvmsgs_default(struct nl_sock *sk)
Receive a set of message from a netlink socket using handlers in nl_sock.
Definition: nl.c:1087
nl_socket_get_fd
int nl_socket_get_fd(const struct nl_sock *sk)
Return the file descriptor of the backing socket.
Definition: socket.c:578
nl_socket_disable_seq_check
void nl_socket_disable_seq_check(struct nl_sock *sk)
Disable sequence number checking.
Definition: socket.c:277
nl_socket_modify_cb
int nl_socket_modify_cb(struct nl_sock *sk, enum nl_cb_type type, enum nl_cb_kind kind, nl_recvmsg_msg_cb_t func, void *arg)
Modify the callback handler associated with the socket.
Definition: socket.c:765
NL_DUMP_STATS
@ NL_DUMP_STATS
Dump all attributes including statistics.
Definition: types.h:18
nl_dump_params
Dumping parameters.
Definition: types.h:28
nl_dump_params::dp_type
enum nl_dump_type dp_type
Specifies the type of dump that is requested.
Definition: types.h:32