/*
 * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
 * Copyright (c) 2017 The strace developers.
 * 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 "tests.h"

#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/tcp.h>
#include "test_nlattr.h"
#include <linux/inet_diag.h>
#include <linux/rtnetlink.h>
#include <linux/sock_diag.h>

static const char address[] = "10.11.12.13";

#ifdef HAVE_IF_INDEXTONAME
# define IFINDEX_LO	(if_nametoindex("lo"))
#else
# define IFINDEX_LO	1
#endif

static void
init_inet_diag_req(struct nlmsghdr *const nlh, const unsigned int msg_len)
{
	SET_STRUCT(struct nlmsghdr, nlh,
		.nlmsg_len = msg_len,
		.nlmsg_type = TCPDIAG_GETSOCK,
		.nlmsg_flags = NLM_F_REQUEST
	);

	struct inet_diag_req *const req = NLMSG_DATA(nlh);
	SET_STRUCT(struct inet_diag_req, req,
		.idiag_family = AF_INET,
		.idiag_ext = 1 << (INET_DIAG_TOS - 1),
		.idiag_states = 1 << TCP_LAST_ACK,
		.id.idiag_if = IFINDEX_LO
	);

	if (!inet_pton(AF_INET, address, req->id.idiag_src) ||
	    !inet_pton(AF_INET, address, req->id.idiag_dst))
		perror_msg_and_skip("inet_pton");
}

static void
print_inet_diag_req(const unsigned int msg_len)
{
	printf("{len=%u, type=TCPDIAG_GETSOCK, flags=NLM_F_REQUEST"
	       ", seq=0, pid=0}, {idiag_family=AF_INET"
	       ", idiag_src_len=0, idiag_dst_len=0"
	       ", idiag_ext=1<<(INET_DIAG_TOS-1)"
	       ", id={idiag_sport=htons(0), idiag_dport=htons(0)"
	       ", idiag_src=inet_addr(\"%s\")"
	       ", idiag_dst=inet_addr(\"%s\")"
	       ", idiag_if=if_nametoindex(\"lo\")"
	       ", idiag_cookie=[0, 0]}"
	       ", idiag_states=1<<TCP_LAST_ACK, idiag_dbs=0}",
	       msg_len, address, address);
}

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

	int fd = create_nl_socket(NETLINK_SOCK_DIAG);
	const unsigned int hdrlen = sizeof(struct inet_diag_req);
	void *nlh0 = tail_alloc(NLMSG_SPACE(hdrlen));

	static char pattern[4096];
	fill_memory_ex(pattern, sizeof(pattern), 'a', 'z' - 'a' + 1);

	char nla_type_str[256];
	sprintf(nla_type_str, "%#x /* INET_DIAG_REQ_??? */",
		INET_DIAG_REQ_BYTECODE + 1);
	TEST_NLATTR_(fd, nlh0, hdrlen,
		     init_inet_diag_req, print_inet_diag_req,
		     INET_DIAG_REQ_BYTECODE + 1, nla_type_str,
		     4, pattern, 4,
		     print_quoted_hex(pattern, 4));

	puts("+++ exited with 0 +++");
	return 0;
}