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/*
* This file is a part of plotnetcfg, a tool to visualize network config.
* Copyright (C) 2014 Red Hat, Inc. -- Jiri Benc <jbenc@redhat.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include "../handler.h"
#include "bridge.h"
static int bridge_scan(struct if_entry *entry);
static struct handler h_bridge = {
.scan = bridge_scan,
};
void handler_bridge_register(void)
{
handler_register(&h_bridge);
}
static int bridge_scan(struct if_entry *entry)
{
int fd, res;
char buf[37 + IFNAMSIZ + 1];
if (entry->master_index)
return 0;
snprintf(buf, sizeof(buf), "/sys/class/net/%s/brport/bridge/ifindex", entry->if_name);
fd = open(buf, O_RDONLY);
if (fd < 0) {
if (errno == ENOENT)
return 0;
return errno;
}
res = read(fd, buf, sizeof(buf));
if (res < 0) {
res = errno;
goto out;
}
if (res == 0) {
res = EINVAL;
goto out;
}
entry->master_index = atoi(buf);
res = 0;
out:
close(fd);
return res;
}
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