freebsd-dev/usr.sbin/rtsold/cap_llflags.c
Mark Johnston e7485a436b Avoid relying on pollution from libcasper.h.
Reported by:	sjg
Sponsored by:	The FreeBSD Foundation
2019-11-21 00:17:14 +00:00

159 lines
4.4 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2018 The FreeBSD Foundation
*
* This software was developed by Mark Johnston under sponsorship from
* the FreeBSD Foundation.
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/dnv.h>
#include <sys/ioctl.h>
#include <sys/nv.h>
#include <sys/queue.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <errno.h>
#include <ifaddrs.h>
#include <string.h>
#include <unistd.h>
#include <libcasper.h>
#include <libcasper_service.h>
#include "rtsold.h"
/*
* A service to fetch the flags for the link-local IPv6 address on the specified
* interface. This cannot easily be done in capability mode because we need to
* use the routing socket sysctl API to find the link-local address of a
* particular interface. The SIOCGIFCONF ioctl is one other option, but as
* currently implemented it is less flexible (it cannot report the required
* buffer length), and hard-codes a buffer length limit.
*/
static int
llflags_get(const char *ifname, int *flagsp)
{
struct in6_ifreq ifr6;
struct ifaddrs *ifap, *ifa;
struct sockaddr_in6 *sin6;
int error, s;
s = socket(PF_INET6, SOCK_DGRAM, 0);
if (s < 0)
return (-1);
if (getifaddrs(&ifap) != 0)
return (-1);
error = -1;
for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
if (strcmp(ifa->ifa_name, ifname) != 0)
continue;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
sin6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr;
if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
continue;
memset(&ifr6, 0, sizeof(ifr6));
if (strlcpy(ifr6.ifr_name, ifname, sizeof(ifr6.ifr_name)) >=
sizeof(ifr6.ifr_name)) {
freeifaddrs(ifap);
errno = EINVAL;
return (-1);
}
memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
error = errno;
freeifaddrs(ifap);
errno = error;
return (-1);
}
*flagsp = ifr6.ifr_ifru.ifru_flags6;
error = 0;
break;
}
(void)close(s);
freeifaddrs(ifap);
if (error == -1)
errno = ENOENT;
return (error);
}
int
cap_llflags_get(cap_channel_t *cap, const char *ifname, int *flagsp)
{
#ifdef WITH_CASPER
nvlist_t *nvl;
int error;
nvl = nvlist_create(0);
nvlist_add_string(nvl, "cmd", "get");
nvlist_add_string(nvl, "ifname", ifname);
nvl = cap_xfer_nvlist(cap, nvl);
if (nvl == NULL)
return (-1);
error = (int)dnvlist_get_number(nvl, "error", 0);
if (error == 0)
*flagsp = (int)nvlist_get_number(nvl, "flags");
nvlist_destroy(nvl);
if (error != 0)
errno = error;
return (error == 0 ? 0 : -1);
#else
(void)cap;
return (llflags_get(ifname, flagsp));
#endif
}
#ifdef WITH_CASPER
static int
llflags_command(const char *cmd, const nvlist_t *limits __unused,
nvlist_t *nvlin, nvlist_t *nvlout)
{
const char *ifname;
int flags;
if (strcmp(cmd, "get") != 0)
return (EINVAL);
ifname = nvlist_get_string(nvlin, "ifname");
if (llflags_get(ifname, &flags) != 0)
return (errno);
nvlist_add_number(nvlout, "flags", flags);
return (0);
}
CREATE_SERVICE("rtsold.llflags", NULL, llflags_command, 0);
#endif /* WITH_CASPER */