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/*
* This file is part of net-yy-unix strace test.
*
* Copyright (c) 2014-2016 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2014-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <assert.h>
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "netlink.h"
#include <linux/sock_diag.h>
#include <linux/unix_diag.h>
static void
send_query(const int fd)
{
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_REQUEST | NLM_F_DUMP
},
.udr = {
.sdiag_family = AF_UNIX,
.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
};
if (sendmsg(fd, &msg, 0) <= 0)
perror_msg_and_skip("sendmsg");
}
static void
check_responses(const int fd)
{
static union {
struct nlmsghdr hdr;
long buf[8192 / sizeof(long)];
} hdr_buf;
struct sockaddr_nl nladdr = {
.nl_family = AF_NETLINK
};
struct iovec iov = {
.iov_base = hdr_buf.buf,
.iov_len = sizeof(hdr_buf.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)
perror_msg_and_skip("recvmsg");
struct nlmsghdr *h = &hdr_buf.hdr;
if (!is_nlmsg_ok(h, ret))
error_msg_and_skip("!is_nlmsg_ok");
if (h->nlmsg_type == NLMSG_ERROR) {
const struct nlmsgerr *err = NLMSG_DATA(h);
if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
error_msg_and_skip("NLMSG_ERROR");
errno = -err->error;
perror_msg_and_skip("NLMSG_ERROR");
}
if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY)
error_msg_and_skip("unexpected nlmsg_type %u",
(unsigned) h->nlmsg_type);
const struct unix_diag_msg *diag = NLMSG_DATA(h);
if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*diag)))
error_msg_and_skip("short response");
}
#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(AF_UNIX, SOCK_STREAM, 0))
perror_msg_and_skip("socket AF_UNIX");
if (bind(0, (struct sockaddr *) &addr, len))
perror_msg_and_skip("bind");
if (listen(0, 5))
perror_msg_and_skip("listen");
assert(unlink(SUN_PATH) == 0);
if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) != 1)
perror_msg_and_skip("socket AF_NETLINK");
send_query(1);
check_responses(1);
return 0;
}
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