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freebsd/sbin/ifconfig/ifgroup.c
Dag-Erling Smørgrav 6c1336a96c Do not error out when adding an interface to a group to which it
already belongs or removing it from a group to which it does not
belong.  This makes it possible to include group memberships in
ifconfig_foo0 in rc.conf without fear of breaking "service netif
restart foo0".

MFC after:	3 days
2013-10-19 09:59:11 +00:00

187 lines
5.0 KiB
C

/*-
* Copyright (c) 2006 Max Laier. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ifconfig.h"
/* ARGSUSED */
static void
setifgroup(const char *group_name, int d, int s, const struct afswtch *rafp)
{
struct ifgroupreq ifgr;
memset(&ifgr, 0, sizeof(ifgr));
strlcpy(ifgr.ifgr_name, name, IFNAMSIZ);
if (group_name[0] && isdigit(group_name[strlen(group_name) - 1]))
errx(1, "setifgroup: group names may not end in a digit");
if (strlcpy(ifgr.ifgr_group, group_name, IFNAMSIZ) >= IFNAMSIZ)
errx(1, "setifgroup: group name too long");
if (ioctl(s, SIOCAIFGROUP, (caddr_t)&ifgr) == -1 && errno != EEXIST)
err(1," SIOCAIFGROUP");
}
/* ARGSUSED */
static void
unsetifgroup(const char *group_name, int d, int s, const struct afswtch *rafp)
{
struct ifgroupreq ifgr;
memset(&ifgr, 0, sizeof(ifgr));
strlcpy(ifgr.ifgr_name, name, IFNAMSIZ);
if (group_name[0] && isdigit(group_name[strlen(group_name) - 1]))
errx(1, "unsetifgroup: group names may not end in a digit");
if (strlcpy(ifgr.ifgr_group, group_name, IFNAMSIZ) >= IFNAMSIZ)
errx(1, "unsetifgroup: group name too long");
if (ioctl(s, SIOCDIFGROUP, (caddr_t)&ifgr) == -1 && errno != ENOENT)
err(1, "SIOCDIFGROUP");
}
static void
getifgroups(int s)
{
int len, cnt;
struct ifgroupreq ifgr;
struct ifg_req *ifg;
if (!verbose)
return;
memset(&ifgr, 0, sizeof(ifgr));
strlcpy(ifgr.ifgr_name, name, IFNAMSIZ);
if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
if (errno == EINVAL || errno == ENOTTY)
return;
else
err(1, "SIOCGIFGROUP");
}
len = ifgr.ifgr_len;
ifgr.ifgr_groups =
(struct ifg_req *)calloc(len / sizeof(struct ifg_req),
sizeof(struct ifg_req));
if (ifgr.ifgr_groups == NULL)
err(1, "getifgroups");
if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
err(1, "SIOCGIFGROUP");
cnt = 0;
ifg = ifgr.ifgr_groups;
for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
len -= sizeof(struct ifg_req);
if (strcmp(ifg->ifgrq_group, "all")) {
if (cnt == 0)
printf("\tgroups: ");
cnt++;
printf("%s ", ifg->ifgrq_group);
}
}
if (cnt)
printf("\n");
}
static void
printgroup(const char *groupname)
{
struct ifgroupreq ifgr;
struct ifg_req *ifg;
int len, cnt = 0;
int s;
s = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (s == -1)
err(1, "socket(AF_LOCAL,SOCK_DGRAM)");
bzero(&ifgr, sizeof(ifgr));
strlcpy(ifgr.ifgr_name, groupname, sizeof(ifgr.ifgr_name));
if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1) {
if (errno == EINVAL || errno == ENOTTY ||
errno == ENOENT)
exit(0);
else
err(1, "SIOCGIFGMEMB");
}
len = ifgr.ifgr_len;
if ((ifgr.ifgr_groups = calloc(1, len)) == NULL)
err(1, "printgroup");
if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1)
err(1, "SIOCGIFGMEMB");
for (ifg = ifgr.ifgr_groups; ifg && len >= sizeof(struct ifg_req);
ifg++) {
len -= sizeof(struct ifg_req);
printf("%s\n", ifg->ifgrq_member);
cnt++;
}
free(ifgr.ifgr_groups);
exit(0);
}
static struct cmd group_cmds[] = {
DEF_CMD_ARG("group", setifgroup),
DEF_CMD_ARG("-group", unsetifgroup),
};
static struct afswtch af_group = {
.af_name = "af_group",
.af_af = AF_UNSPEC,
.af_other_status = getifgroups,
};
static struct option group_gopt = { "g:", "[-g groupname]", printgroup };
static __constructor void
group_ctor(void)
{
#define N(a) (sizeof(a) / sizeof(a[0]))
int i;
for (i = 0; i < N(group_cmds); i++)
cmd_register(&group_cmds[i]);
af_register(&af_group);
opt_register(&group_gopt);
#undef N
}