1  /*
       2   * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
       3   * Copyright (c) 2017-2021 The strace developers.
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: GPL-2.0-or-later
       7   */
       8  
       9  #include "tests.h"
      10  
      11  #include <stdio.h>
      12  #include "test_nlattr.h"
      13  #include <linux/netconf.h>
      14  #include <linux/rtnetlink.h>
      15  
      16  static void
      17  init_netconfmsg(struct nlmsghdr *const nlh, const unsigned int msg_len)
      18  {
      19  	SET_STRUCT(struct nlmsghdr, nlh,
      20  		.nlmsg_len = msg_len,
      21  		.nlmsg_type = RTM_GETNETCONF,
      22  		.nlmsg_flags = NLM_F_DUMP
      23  	);
      24  
      25  	struct netconfmsg *const msg = NLMSG_DATA(nlh);
      26  	SET_STRUCT(struct netconfmsg, msg,
      27  		.ncm_family = AF_INET
      28  	);
      29  }
      30  
      31  static void
      32  print_netconfmsg(const unsigned int msg_len)
      33  {
      34  	printf("{nlmsg_len=%u, nlmsg_type=RTM_GETNETCONF"
      35  	       ", nlmsg_flags=NLM_F_DUMP, nlmsg_seq=0, nlmsg_pid=0}"
      36  	       ", {ncm_family=AF_INET}",
      37  	       msg_len);
      38  }
      39  
      40  int
      41  main(void)
      42  {
      43  	skip_if_unavailable("/proc/self/fd/");
      44  
      45  	const int fd = create_nl_socket(NETLINK_ROUTE);
      46  
      47  	const unsigned int hdrlen = sizeof(struct netconfmsg);
      48  	void *nlh0 = midtail_alloc(NLMSG_SPACE(hdrlen), NLA_HDRLEN + 4);
      49  
      50  	static char pattern[4096];
      51  	fill_memory_ex(pattern, sizeof(pattern), 'a', 'z' - 'a' + 1);
      52  
      53  	const unsigned int nla_type = 0xffff & NLA_TYPE_MASK;
      54  	char nla_type_str[256];
      55  	sprintf(nla_type_str, "%#x /* NETCONFA_??? */", nla_type);
      56  	TEST_NLATTR_(fd, nlh0, hdrlen,
      57  		     init_netconfmsg, print_netconfmsg,
      58  		     nla_type, nla_type_str,
      59  		     4, pattern, 4,
      60  		     print_quoted_hex(pattern, 4));
      61  
      62  	puts("+++ exited with 0 +++");
      63  	return 0;
      64  }