libnl: /data/src/libnl/src/nl-monitor.c Source File

libnl 3.12.0

nl-monitor.c
1/* SPDX-License-Identifier: LGPL-2.1-only */
2/*
3 * Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>
4 */
5
6#include "nl-default.h"
7
8#include <linux/rtnetlink.h>
9
10#include <netlink/cli/utils.h>
11#include <netlink/cli/link.h>
12#include <netlink/cli/mdb.h>
13
14static const struct {
15 enum rtnetlink_groups gr_id;
16 const char* gr_name;
17} known_groups[] = {
18 { RTNLGRP_LINK, "link" },
19 { RTNLGRP_NOTIFY, "notify" },
20 { RTNLGRP_NEIGH, "neigh" },
21 { RTNLGRP_TC, "tc" },
22 { RTNLGRP_IPV4_IFADDR, "ipv4-ifaddr" },
23 { RTNLGRP_IPV4_MROUTE, "ipv4-mroute" },
24 { RTNLGRP_IPV4_ROUTE, "ipv4-route" },
25 { RTNLGRP_IPV6_IFADDR, "ipv6-ifaddr" },
26 { RTNLGRP_IPV6_MROUTE, "ipv6-mroute" },
27 { RTNLGRP_IPV6_ROUTE, "ipv6-route" },
28 { RTNLGRP_IPV6_IFINFO, "ipv6-ifinfo" },
29 { RTNLGRP_DECnet_IFADDR, "decnet-ifaddr" },
30 { RTNLGRP_DECnet_ROUTE, "decnet-route" },
31 { RTNLGRP_IPV6_PREFIX, "ipv6-prefix" },
32 { RTNLGRP_IPV4_NETCONF, "ipv4-netconf" },
33 { RTNLGRP_IPV6_NETCONF, "ipv6-netconf" },
34 { RTNLGRP_MPLS_NETCONF, "mpls-netconf" },
35 { RTNLGRP_MDB, "mdb" },
36 { RTNLGRP_NONE, NULL }
37};
38
39static void obj_input(struct nl_object *obj, void *arg)
40{
41 nl_object_dump(obj, arg);
42}
43
44static int event_input(struct nl_msg *msg, void *arg)
45{
46 if (nl_msg_parse(msg, &obj_input, arg) < 0)
47 fprintf(stderr, "<<EVENT>> Unknown message type\n");
48
49 /* Exit nl_recvmsgs_def() and return to the main select() */
50 return NL_STOP;
51}
52
53static void print_usage(void)
54{
55 int i;
56
57 printf(
58 "Usage: nl-monitor [OPTION] [<groups>]\n"
59 "\n"
60 "Options\n"
61 " -d, --debug=LEVEL Set libnl debug level { 0 - 7 }\n"
62 " -f, --format=TYPE Output format { brief | details | stats }\n"
63 " -h, --help Show this help.\n"
64 "\n"
65 );
66 printf("Known groups:");
67 for (i = 0; known_groups[i].gr_id != RTNLGRP_NONE; i++)
68 printf(" %s", known_groups[i].gr_name);
69 printf("\n");
70 exit(0);
71}
72
73int main(int argc, char *argv[])
74{
75 struct nl_dump_params dp = {
76 .dp_type = NL_DUMP_STATS,
77 .dp_fd = stdout,
78 .dp_dump_msgtype = 1,
79 };
80
81 struct nl_sock *sock;
82 int err = 1;
83 int i, idx;
84
85 sock = nl_cli_alloc_socket();
86 nl_socket_disable_seq_check(sock);
87 nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, event_input, &dp);
88
89 for (;;) {
90 int c, optidx = 0;
91 static struct option long_opts[] = {
92 { "debug", 1, 0, 'd' },
93 { "format", 1, 0, 'f' },
94 { "help", 0, 0, 'h' },
95 { 0, 0, 0, 0 }
96 };
97
98 c = getopt_long(argc, argv, "d:f:h", long_opts, &optidx);
99 if (c == -1)
100 break;
101
102 switch (c) {
103 case 'd':
104 nl_debug = atoi(optarg);
105 break;
106 case 'f':
107 dp.dp_type = nl_cli_parse_dumptype(optarg);
108 break;
109 default:
110 print_usage();
111 break;
112 }
113 }
114
115 nl_cli_connect(sock, NETLINK_ROUTE);
116
117 for (idx = optind; argc > idx; idx++) {
118 for (i = 0; known_groups[i].gr_id != RTNLGRP_NONE; i++) {
119 if (!strcmp(argv[idx], known_groups[i].gr_name)) {
120
121 if ((err = nl_socket_add_membership(sock, known_groups[i].gr_id)) < 0) {
122 nl_cli_fatal(err, "%s: %s\n", argv[idx],
123 nl_geterror(err));
124 }
125
126 break;
127 }
128 }
129 if (known_groups[i].gr_id == RTNLGRP_NONE)
130 fprintf(stderr, "Warning: Unknown group: %s\n", argv[idx]);
131 }
132
133 nl_cli_link_alloc_cache(sock);
134
135 while (1) {
136 fd_set rfds;
137 int fd, retval;
138
139 fd = nl_socket_get_fd(sock);
140
141 FD_ZERO(&rfds);
142 FD_SET(fd, &rfds);
143 /* wait for an incoming message on the netlink socket */
144 retval = select(fd+1, &rfds, NULL, NULL, NULL);
145
146 if (retval) {
147 /* FD_ISSET(fd, &rfds) will be true */
148 nl_recvmsgs_default(sock);
149 }
150 }
151
152 return 0;
153}
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:294
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:1096
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:609
nl_socket_disable_seq_check
void nl_socket_disable_seq_check(struct nl_sock *sk)
Disable sequence number checking.
Definition socket.c:304
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:796
nl_debug
int nl_debug
Global variable indicating the desired level of debugging output.
Definition utils.c:52
NL_DUMP_STATS
@ NL_DUMP_STATS
Dump all attributes including statistics.
Definition types.h:22
nl_dump_params
Dumping parameters.
Definition types.h:32
nl_dump_params::dp_type
enum nl_dump_type dp_type
Specifies the type of dump that is requested.
Definition types.h:36