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/*
* This file is part of net-yy-netlink strace test.
*
* Copyright (c) 2014-2016 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
* Copyright (c) 2016-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include "netlink.h"
#include <linux/sock_diag.h>
#include <linux/netlink_diag.h>
static void
send_query(const int fd)
{
struct sockaddr_nl nladdr = {
.nl_family = AF_NETLINK
};
struct {
struct nlmsghdr nlh;
struct netlink_diag_req ndr;
} req = {
.nlh = {
.nlmsg_len = sizeof(req),
.nlmsg_type = SOCK_DIAG_BY_FAMILY,
.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
},
.ndr = {
.sdiag_family = AF_NETLINK,
.sdiag_protocol = NDIAG_PROTO_ALL
}
};
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 netlink_diag_msg *diag = NLMSG_DATA(h);
if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*diag)))
error_msg_and_skip("short response");
}
int main(void)
{
struct sockaddr_nl addr;
socklen_t len = sizeof(addr);
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
close(0);
close(1);
if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG))
perror_msg_and_skip("socket AF_NETLINK");
if (bind(0, (struct sockaddr *) &addr, len))
perror_msg_and_skip("bind");
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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