libnl  3.5.0
nl-classid-lookup.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3  * src/nl-classid-lookup.c Lookup classid
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation version 2.1
8  * of the License.
9  *
10  * Copyright (c) 2010 Thomas Graf <tgraf@suug.ch>
11  */
12 
13 #include <netlink/cli/utils.h>
14 #include <linux/pkt_sched.h>
15 
16 static void print_usage(void)
17 {
18  printf(
19 "Usage: nl-classid-lookup [OPTIONS]... NAME\n"
20 "\n"
21 "OPTIONS\n"
22 " -h, --help Show this help text.\n"
23 " -v, --version Show versioning information.\n"
24 " -r, --reverse Do a reverse lookup, i.e. classid to name.\n"
25 " --raw Print the raw classid, not pretty printed.\n"
26 "\n"
27 "EXAMPLE\n"
28 " $ nl-classid-lookup low_latency\n"
29 " $ nl-classid-lookup -r 1:12\n"
30 "\n"
31  );
32  exit(0);
33 }
34 
35 int main(int argc, char *argv[])
36 {
37  uint32_t classid;
38  char *name;
39  int err, reverse = 0, raw = 0;
40 
41  for (;;) {
42  int c, optidx = 0;
43  enum {
44  ARG_RAW = 257,
45  };
46  static struct option long_opts[] = {
47  { "help", 0, 0, 'h' },
48  { "version", 0, 0, 'v' },
49  { "reverse", 0, 0, 'r' },
50  { "raw", 0, 0, ARG_RAW },
51  { 0, 0, 0, 0 }
52  };
53 
54  c = getopt_long(argc, argv, "hvr", long_opts, &optidx);
55  if (c == -1)
56  break;
57 
58  switch (c) {
59  case 'h': print_usage(); break;
60  case 'v': nl_cli_print_version(); break;
61  case 'r': reverse = 1; break;
62  case ARG_RAW: raw = 1; break;
63  }
64  }
65 
66  if (optind >= argc)
67  print_usage();
68 
69  name = argv[optind++];
70 
71  /*
72  * We use rtnl_tc_str2handle() even while doing a reverse lookup. This
73  * allows for name -> name lookups. This is intentional, it does not
74  * do any harm and avoids duplicating a lot of code.
75  */
76  if ((err = rtnl_tc_str2handle(name, &classid)) < 0)
77  nl_cli_fatal(err, "Unable to lookup classid \"%s\": %s",
78  name, nl_geterror(err));
79 
80  if (reverse) {
81  char buf[64];
82  printf("%s\n", rtnl_tc_handle2str(classid, buf, sizeof(buf)));
83  } else if (raw)
84  printf("%#x\n", classid);
85  else
86  printf("%x:%x\n", TC_H_MAJ(classid) >> 16, TC_H_MIN(classid));
87 
88  return 0;
89 }
int rtnl_tc_str2handle(const char *str, uint32_t *res)
Convert a charactering strint to a traffic control handle.
Definition: classid.c:155
void nl_cli_fatal(int err, const char *fmt,...)
Print error message and quit application.
Definition: utils.c:78
char * rtnl_tc_handle2str(uint32_t handle, char *buf, size_t len)
Convert a traffic control handle to a character string (Reentrant).
Definition: classid.c:110