libnl: /data/src/libnl3/src/nl-route-get.c Source File

libnl 3.7.0

nl-route-get.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3 * Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>
4 */
5
6 #include <netlink/cli/utils.h>
7 #include <netlink/cli/route.h>
8 #include <netlink/cli/link.h>
9
10 #include <linux/rtnetlink.h>
11
12 static void print_usage(void)
13 {
14 printf("Usage: nl-route-get <addr>\n");
15 exit(1);
16 }
17
18 static void parse_cb(struct nl_object *obj, void *arg)
19 {
20 //struct rtnl_route *route = (struct rtnl_route *) obj;
21 struct nl_dump_params params = {
22 .dp_fd = stdout,
23 .dp_type = NL_DUMP_DETAILS,
24 };
25
26 nl_object_dump(obj, &params);
27 }
28
29 static int cb(struct nl_msg *msg, void *arg)
30 {
31 int err;
32
33 if ((err = nl_msg_parse(msg, &parse_cb, NULL)) < 0)
34 nl_cli_fatal(err, "Unable to parse object: %s", nl_geterror(err));
35
36 return 0;
37 }
38
39 int main(int argc, char *argv[])
40 {
41 struct nl_sock *sock;
42 struct nl_addr *dst;
43 int err = 1;
44
45 if (argc < 2 || !strcmp(argv[1], "-h"))
46 print_usage();
47
48 sock = nl_cli_alloc_socket();
49 nl_cli_connect(sock, NETLINK_ROUTE);
50 nl_cli_link_alloc_cache(sock);
51 nl_cli_route_alloc_cache(sock, 0);
52
53 dst = nl_cli_addr_parse(argv[1], AF_INET);
54
55 {
56 struct nl_msg *m;
57 struct rtmsg rmsg = {
58 .rtm_family = nl_addr_get_family(dst),
59 .rtm_dst_len = nl_addr_get_prefixlen(dst),
60 };
61
62 m = nlmsg_alloc_simple(RTM_GETROUTE, 0);
63 if (!m)
64 nl_cli_fatal(ENOMEM, "out of memory");
65 if (nlmsg_append(m, &rmsg, sizeof(rmsg), NLMSG_ALIGNTO) < 0)
66 nl_cli_fatal(ENOMEM, "out of memory");
67 if (nla_put_addr(m, RTA_DST, dst) < 0)
68 nl_cli_fatal(ENOMEM, "out of memory");
69
70 err = nl_send_auto_complete(sock, m);
71 nlmsg_free(m);
72 if (err < 0)
73 nl_cli_fatal(err, "%s", nl_geterror(err));
74
75 nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
76
77 if (nl_recvmsgs_default(sock) < 0)
78 nl_cli_fatal(err, "%s", nl_geterror(err));
79 }
80
81 return 0;
82 }
nl_addr_get_family
int nl_addr_get_family(const struct nl_addr *addr)
Return address family.
Definition: addr.c:887
nl_addr_get_prefixlen
unsigned int nl_addr_get_prefixlen(const struct nl_addr *addr)
Return prefix length of abstract address object.
Definition: addr.c:970
nla_put_addr
int nla_put_addr(struct nl_msg *msg, int attrtype, struct nl_addr *addr)
Add abstract address as unspecific attribute to netlink message.
Definition: attr.c:542
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
nlmsg_alloc_simple
struct nl_msg * nlmsg_alloc_simple(int nlmsgtype, int flags)
Allocate a new netlink message.
Definition: msg.c:341
nlmsg_free
void nlmsg_free(struct nl_msg *msg)
Release a reference from an netlink message.
Definition: msg.c:558
nlmsg_append
int nlmsg_append(struct nl_msg *n, void *data, size_t len, int pad)
Append data to tail of a netlink message.
Definition: msg.c:442
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_send_auto_complete
int nl_send_auto_complete(struct nl_sock *sk, struct nl_msg *msg)
Definition: nl.c:1241
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_DETAILS
@ NL_DUMP_DETAILS
Dump all attributes but no statistics.
Definition: types.h:17
nl_dump_params
Dumping parameters.
Definition: types.h:28
nl_dump_params::dp_fd
FILE * dp_fd
File descriptor the dumping output should go to.
Definition: types.h:77