libnl  3.6.0
nl-fib-lookup.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 
8 #include <linux/rtnetlink.h>
9 
10 static void print_usage(void)
11 {
12  printf(
13  "Usage: nl-fib-lookup [options] <addr>\n"
14  "Options:\n"
15  " -t, --table <table> Table id\n"
16  " -f, --fwmark <int> Firewall mark\n"
17  " -s, --scope <scope> Routing scope\n"
18  " -T, --tos <int> Type of Service\n");
19  exit(1);
20 }
21 
22 int main(int argc, char *argv[])
23 {
24  struct nl_sock *nlh;
25  struct nl_cache *result;
26  struct flnl_request *request;
27  struct nl_addr *addr;
28  struct nl_dump_params params = {
29  .dp_fd = stdout,
30  .dp_type = NL_DUMP_DETAILS,
31  };
32  int table = RT_TABLE_UNSPEC, scope = RT_SCOPE_UNIVERSE;
33  int tos = 0, err = 1;
34  uint64_t fwmark = 0;
35 
36  while (1) {
37  static struct option long_opts[] = {
38  {"table", 1, 0, 't'},
39  {"fwmark", 1, 0, 'f'},
40  {"scope", 1, 0, 's'},
41  {"tos", 1, 0, 'T'},
42  {"help", 0, 0, 'h'},
43  {0, 0, 0, 0},
44  };
45  int c, idx = 0;
46 
47  c = getopt_long(argc, argv, "t:f:s:T:h", long_opts, &idx);
48  if (c == -1)
49  break;
50 
51  switch (c) {
52  case 't':
53  table = strtoul(optarg, NULL, 0);
54  break;
55  case 'f':
56  fwmark = strtoul(optarg, NULL, 0);
57  break;
58  case 's':
59  scope = strtoul(optarg, NULL, 0);
60  break;
61  case 'T':
62  tos = strtoul(optarg, NULL, 0);
63  break;
64  default:
65  print_usage();
66  }
67  }
68 
69  if (optind >= argc)
70  print_usage();
71 
72  nlh = nl_cli_alloc_socket();
73 
74  if ((err = nl_addr_parse(argv[optind], AF_INET, &addr)) < 0)
75  nl_cli_fatal(err, "Unable to parse address \"%s\": %s\n",
76  argv[optind], nl_geterror(err));
77 
78  result = flnl_result_alloc_cache();
79  if (!result)
80  nl_cli_fatal(ENOMEM, "Unable to allocate cache");
81 
82  request = flnl_request_alloc();
83  if (!request)
84  nl_cli_fatal(ENOMEM, "Unable to allocate request");
85 
86  flnl_request_set_table(request, table);
87  flnl_request_set_fwmark(request, fwmark);
88  flnl_request_set_scope(request, scope);
89  flnl_request_set_tos(request, tos);
90 
91  err = flnl_request_set_addr(request, addr);
92  nl_addr_put(addr);
93  if (err < 0)
94  nl_cli_fatal(err, "Unable to send request: %s", nl_geterror(err));
95 
96  nl_cli_connect(nlh, NETLINK_FIB_LOOKUP);
97 
98  err = flnl_lookup(nlh, request, result);
99  if (err < 0)
100  nl_cli_fatal(err, "Unable to lookup: %s\n", nl_geterror(err));
101 
102  nl_cache_dump(result, &params);
103 
104  return 0;
105 }
int nl_addr_parse(const char *addrstr, int hint, struct nl_addr **result)
Allocate abstract address based on character string.
Definition: addr.c:292
void nl_addr_put(struct nl_addr *addr)
Decrease the reference counter of an abstract address.
Definition: addr.c:533
void nl_cache_dump(struct nl_cache *cache, struct nl_dump_params *params)
Dump all elements of a cache.
Definition: cache.c:1197
void nl_cli_fatal(int err, const char *fmt,...)
Print error message and quit application.
Definition: utils.c:71
struct nl_cache * flnl_result_alloc_cache(void)
Allocate lookup result cache.
Definition: lookup.c:177
int flnl_lookup(struct nl_sock *sk, struct flnl_request *req, struct nl_cache *cache)
Perform FIB Lookup.
Definition: lookup.c:256
@ NL_DUMP_DETAILS
Dump all attributes but no statistics.
Definition: types.h:17
Dumping parameters.
Definition: types.h:28
FILE * dp_fd
File descriptor the dumping output should go to.
Definition: types.h:77