libnl  3.2.24-rc1
nl-classid-lookup.c
1 /*
2  * src/nl-classid-lookup.c Lookup classid
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) 2010 Thomas Graf <tgraf@suug.ch>
10  */
11 
12 #include <netlink/cli/utils.h>
13 
14 static void print_usage(void)
15 {
16  printf(
17 "Usage: nl-classid-lookup [OPTIONS]... NAME\n"
18 "\n"
19 "OPTIONS\n"
20 " -h, --help Show this help text.\n"
21 " -v, --version Show versioning information.\n"
22 " -r, --reverse Do a reverse lookup, i.e. classid to name.\n"
23 " --raw Print the raw classid, not pretty printed.\n"
24 "\n"
25 "EXAMPLE\n"
26 " $ nl-classid-lookup low_latency\n"
27 " $ nl-classid-lookup -r 1:12\n"
28 "\n"
29  );
30  exit(0);
31 }
32 
33 int main(int argc, char *argv[])
34 {
35  uint32_t classid;
36  char *name;
37  int err, reverse = 0, raw = 0;
38 
39  for (;;) {
40  int c, optidx = 0;
41  enum {
42  ARG_RAW = 257,
43  };
44  static struct option long_opts[] = {
45  { "help", 0, 0, 'h' },
46  { "version", 0, 0, 'v' },
47  { "reverse", 0, 0, 'r' },
48  { "raw", 0, 0, ARG_RAW },
49  { 0, 0, 0, 0 }
50  };
51 
52  c = getopt_long(argc, argv, "hvr", long_opts, &optidx);
53  if (c == -1)
54  break;
55 
56  switch (c) {
57  case 'h': print_usage(); break;
58  case 'v': nl_cli_print_version(); break;
59  case 'r': reverse = 1; break;
60  case ARG_RAW: raw = 1; break;
61  }
62  }
63 
64  if (optind >= argc)
65  print_usage();
66 
67  name = argv[optind++];
68 
69  /*
70  * We use rtnl_tc_str2handle() even while doing a reverse lookup. This
71  * allows for name -> name lookups. This is intentional, it does not
72  * do any harm and avoids duplicating a lot of code.
73  */
74  if ((err = rtnl_tc_str2handle(name, &classid)) < 0)
75  nl_cli_fatal(err, "Unable to lookup classid \"%s\": %s",
76  name, nl_geterror(err));
77 
78  if (reverse) {
79  char buf[64];
80  printf("%s\n", rtnl_tc_handle2str(classid, buf, sizeof(buf)));
81  } else if (raw)
82  printf("%#x\n", classid);
83  else
84  printf("%x:%x\n", TC_H_MAJ(classid) >> 16, TC_H_MIN(classid));
85 
86  return 0;
87 }