Dmitry V. Levin
38a34c9349
Before this change, all files that exist since 20th century had copyright headers, while most files that appeared later didn't. This change fixes the inconsistency by adding missing copyright headers. It doesn't mean that copyright headers became maintained. In my view, git history provides much better information on this subject and is much more accurate than copyright headers.
133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/*
|
|
* Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
|
|
* 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.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 <assert.h>
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/un.h>
|
|
#include <linux/netlink.h>
|
|
#include <linux/sock_diag.h>
|
|
#include <linux/unix_diag.h>
|
|
|
|
#if !defined NETLINK_SOCK_DIAG && defined NETLINK_INET_DIAG
|
|
# define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
|
|
#endif
|
|
|
|
static int
|
|
send_query(const int fd, const int family, const int proto)
|
|
{
|
|
struct sockaddr_nl nladdr = {
|
|
.nl_family = AF_NETLINK
|
|
};
|
|
struct {
|
|
struct nlmsghdr nlh;
|
|
struct unix_diag_req udr;
|
|
} req = {
|
|
.nlh = {
|
|
.nlmsg_len = sizeof(req),
|
|
.nlmsg_type = SOCK_DIAG_BY_FAMILY,
|
|
.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
|
|
},
|
|
.udr = {
|
|
.sdiag_family = family,
|
|
.sdiag_protocol = proto,
|
|
.udiag_states = -1,
|
|
.udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER
|
|
}
|
|
};
|
|
struct iovec iov = {
|
|
.iov_base = &req,
|
|
.iov_len = sizeof(req)
|
|
};
|
|
struct msghdr msg = {
|
|
.msg_name = (void*)&nladdr,
|
|
.msg_namelen = sizeof(nladdr),
|
|
.msg_iov = &iov,
|
|
.msg_iovlen = 1
|
|
};
|
|
|
|
return sendmsg(fd, &msg, 0) > 0;
|
|
}
|
|
|
|
static int
|
|
check_responses(const int fd)
|
|
{
|
|
static char buf[8192];
|
|
struct sockaddr_nl nladdr = {
|
|
.nl_family = AF_NETLINK
|
|
};
|
|
struct iovec iov = {
|
|
.iov_base = buf,
|
|
.iov_len = sizeof(buf)
|
|
};
|
|
struct msghdr msg = {
|
|
.msg_name = (void*)&nladdr,
|
|
.msg_namelen = sizeof(nladdr),
|
|
.msg_iov = &iov,
|
|
.msg_iovlen = 1
|
|
};
|
|
|
|
ssize_t ret = recvmsg(fd, &msg, 0);
|
|
if (ret <= 0)
|
|
return 0;
|
|
|
|
struct nlmsghdr *h = (struct nlmsghdr*)buf;
|
|
return (NLMSG_OK(h, ret) &&
|
|
h->nlmsg_type != NLMSG_ERROR &&
|
|
h->nlmsg_type != NLMSG_DONE) ? 1 : 0;
|
|
}
|
|
|
|
#define SUN_PATH "netlink_unix_diag_socket"
|
|
int main(void)
|
|
{
|
|
struct sockaddr_un addr = {
|
|
.sun_family = AF_UNIX,
|
|
.sun_path = SUN_PATH
|
|
};
|
|
socklen_t len = offsetof(struct sockaddr_un, sun_path) + sizeof(SUN_PATH);
|
|
|
|
close(0);
|
|
close(1);
|
|
|
|
(void) unlink(SUN_PATH);
|
|
if (socket(PF_LOCAL, SOCK_STREAM, 0) ||
|
|
bind(0, (struct sockaddr *) &addr, len) ||
|
|
listen(0, 5))
|
|
return 77;
|
|
|
|
assert(unlink(SUN_PATH) == 0);
|
|
|
|
if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) != 1)
|
|
return 77;
|
|
|
|
return (send_query(1, AF_UNIX, 0) &&
|
|
check_responses(1)) ? 0 : 77;
|
|
}
|