githubmirror/strace

tests/netlink_generic.c

61 строка1 KB

Dmitry V. Levin

netlink: print struct nlmsghdr followed by payload as an array

01 май 2021, 11:00

01 май 2021, 11:0002f7fb2

/*
 * Copyright (c) 2017-2021 The strace developers.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

/* This test case is based on netlink_selinux.c */

#include "tests.h"

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include "netlink.h"
#include <linux/genetlink.h>

static void
test_nlmsg_type(const int fd)
{
	/*
	 * Though GENL_ID_CTRL number is statically fixed in this test case,
	 * strace does not have a builtin knowledge that the corresponding
	 * string is "nlctrl".
	 */
	long rc;
	struct {
		const struct nlmsghdr nlh;
		struct genlmsghdr gnlh;
	} req = {
		.nlh = {
			.nlmsg_len = sizeof(req),
			.nlmsg_type = GENL_ID_CTRL,
			.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
		},
		.gnlh = {
			.cmd = CTRL_CMD_GETFAMILY
		}
	};

	rc = sendto(fd, &req, sizeof(req), MSG_DONTWAIT, NULL, 0);
	printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=nlctrl"
	       ", nlmsg_flags=NLM_F_REQUEST|0x300, nlmsg_seq=0, nlmsg_pid=0}"
	       ", \"\\x03\\x00\\x00\\x00\"], %u"
	       ", MSG_DONTWAIT, NULL, 0) = %s\n",
	       fd, req.nlh.nlmsg_len,
	       (unsigned int) sizeof(req), sprintrc(rc));
}

int main(void)
{
	skip_if_unavailable("/proc/self/fd/");

	int fd = create_nl_socket(NETLINK_GENERIC);

	test_nlmsg_type(fd);

	printf("+++ exited with 0 +++\n");

	return 0;
}