nl-classid-lookup.c

/* SPDX-License-Identifier: LGPL-2.1-only */
/*
 * Copyright (c) 2010 Thomas Graf <tgraf@suug.ch>
 */
 
#include <netlink/cli/utils.h>
#include <linux/pkt_sched.h>
 
static void print_usage(void)
{
        printf(
"Usage: nl-classid-lookup [OPTIONS]... NAME\n"
"\n"
"OPTIONS\n"
" -h, --help                Show this help text.\n"
" -v, --version             Show versioning information.\n"
" -r, --reverse             Do a reverse lookup, i.e. classid to name.\n"
"     --raw                 Print the raw classid, not pretty printed.\n"
"\n"
"EXAMPLE\n"
"   $ nl-classid-lookup low_latency\n"
"   $ nl-classid-lookup -r 1:12\n"
"\n"
        );
        exit(0);
}
 
int main(int argc, char *argv[])
{
        uint32_t classid;
        char *name;
        int err, reverse = 0, raw = 0;
 
        for (;;) {
                int c, optidx = 0;
                enum {
                        ARG_RAW = 257,
                };
                static struct option long_opts[] = {
                        { "help", 0, 0, 'h' },
                        { "version", 0, 0, 'v' },
                        { "reverse", 0, 0, 'r' },
                        { "raw", 0, 0, ARG_RAW },
                        { 0, 0, 0, 0 }
                };
 
                c = getopt_long(argc, argv, "hvr", long_opts, &optidx);
                if (c == -1)
                        break;
 
                switch (c) {
                case 'h': print_usage(); break;
                case 'v': nl_cli_print_version(); break;
                case 'r': reverse = 1; break;
                case ARG_RAW: raw = 1; break;
                }
        }
 
        if (optind >= argc)
                print_usage();
 
        name = argv[optind++];
 
        /*
         * We use rtnl_tc_str2handle() even while doing a reverse lookup. This
         * allows for name -> name lookups. This is intentional, it does not
         * do any harm and avoids duplicating a lot of code.
         */
        if ((err = rtnl_tc_str2handle(name, &classid)) < 0)
                nl_cli_fatal(err, "Unable to lookup classid \"%s\": %s",
                             name, nl_geterror(err));
 
        if (reverse) {
                char buf[64];
                printf("%s\n", rtnl_tc_handle2str(classid, buf, sizeof(buf)));
        } else if (raw)
                printf("%#x\n", classid);
        else
                printf("%x:%x\n", TC_H_MAJ(classid) >> 16, TC_H_MIN(classid));
 
        return 0;
}