Hi, list!
Attached is the patch that adds to BB ability to manage Ethernet bridges.
It's a stripped down version of brctl utility from GPL
bridge-utils<http://www.linux-foundation.org/en/Net:Bridge>
.
It just helped me to finish tuning of a linux gate which I wanted to be
controlled entirely by only BB utilities.
Hope it will be useful!
--
Vladimir Dronnikov
/* vi: set sw=4 ts=4: */
/*
* stripped down brctl utility from bridge-utils
*
* Copyright (C) 2008 by Vladimir Dronnikov <[EMAIL PROTECTED]>
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#include <linux/sockios.h>
#include <net/if.h>
int brctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int brctl_main(int argc, char **argv)
{
#define cmd argv[1]
#define error cmd
#define bridge argv[2]
#define iface argv[3]
int i;
struct ifreq ifr;
int fd = xsocket(AF_INET, SOCK_STREAM, 0);
/* see how we're called */
/* NOTE: index_in_strings SEGFAULTS (strcmp) if key is NULL. IMHO this
should be fixed in libbb */
/* NOTE: Meanwhile let cmd not be NULL */
/* NOTE: index_in_strings returns -1 on empty first chunk and empty
key. IMHO it should instead return 0 */
/* NOTE: Meanwhile let first chunk be always (despite USE_FEATURE_...)
non-empty */
switch ((i=index_in_strings("show\0" "addbr\0" "delbr\0" "addif\0"
"delif\0", cmd ? cmd : USE_FEATURE_BRCTL_SHOW("show") ""))) {
#define add_or_del (i%2)
USE_FEATURE_BRCTL_SHOW(
/* show bridge(s) info */
case 0:
error = (char *)"to be implemented soon";
goto fail;
)
/* add or delete bridge */
case 1:
case 2:
/* check cmdline */
if (argc < 3)
goto show_usage;
/* NOTE: less bullet-proof than (add_or_del ?
SIOCBRADDBR : SIOCBRDELBR) */
/* NOTE: but saves about 25 bytes */
if (ioctl(fd, SIOCBRADDBR-1+i, bridge)) {
switch (errno) {
case EEXIST:
error = (char *)"device %s
already exists; can't create bridge with the same name";
break;
case ENXIO:
error = (char *)"bridge %s
doesn't exist; can't delete it";
break;
case EBUSY:
error = (char *)"bridge %s is
still up; can't delete it";
break;
default:
error = (char *)(add_or_del ?
"can't add bridge %s" : "can't delete bridge %s");
}
bb_perror_msg_and_die(error, bridge);
}
break;
/* interface management */
case 3:
case 4:
/* check cmdline */
if (argc < 4)
goto show_usage;
/* check interface */
if (!(ifr.ifr_ifindex = if_nametoindex(iface))) {
errno = ENODEV;
/* NOTE: saves some bytes comparing with
explicit bb_perror... */
error = (char *)"interface %s does not exist";
goto fail;
}
safe_strncpy(ifr.ifr_name, bridge, IFNAMSIZ);
/* add or delete interface */
if (ioctl(fd, SIOCBRADDIF-3+i, &ifr)) {
switch (errno) {
case EBUSY:
error = (char *)"device %s is
already a member of a bridge %s";
break;
case ELOOP:
error = (char *)"device %s is a
bridge device itself";
break;
case EINVAL:
error = (char *)"device %s is
not a slave of %s";
break;
default:
error = (char *)(add_or_del ?
"can't add %s to bridge %s" : "can't delete %s from bridge %s");
}
fail:
bb_perror_msg_and_die(error, iface, bridge);
}
break;
default:
show_usage:
bb_show_usage();
}
return 0;
}
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