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      1 /*
      2  * Copyright (c) 2017 JingPiao Chen <chenjingpiao (at) gmail.com>
      3  * Copyright (c) 2017-2018 The strace developers.
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "tests.h"
     30 #include <stdio.h>
     31 #include <stdint.h>
     32 #include "test_nlattr.h"
     33 
     34 #define NLMSGERR_ATTR_COOKIE 3
     35 
     36 static void
     37 init_nlmsgerr(struct nlmsghdr *const nlh, const unsigned int msg_len)
     38 {
     39 	SET_STRUCT(struct nlmsghdr, nlh,
     40 		.nlmsg_len = msg_len,
     41 		.nlmsg_type = NLMSG_ERROR,
     42 		.nlmsg_flags = NLM_F_REQUEST | NLM_F_CAPPED
     43 	);
     44 
     45 	struct nlmsgerr *const err = NLMSG_DATA(nlh);
     46 	SET_STRUCT(struct nlmsgerr, err,
     47 		.error = -13,
     48 		.msg = {
     49 			.nlmsg_len = NLMSG_HDRLEN + 4,
     50 			.nlmsg_type = NLMSG_NOOP,
     51 			.nlmsg_flags = NLM_F_REQUEST,
     52 		}
     53 	);
     54 }
     55 
     56 static void
     57 print_nlmsgerr(const unsigned int msg_len)
     58 {
     59 	printf("{len=%u, type=NLMSG_ERROR"
     60 	       ", flags=NLM_F_REQUEST|NLM_F_CAPPED"
     61 	       ", seq=0, pid=0}, {error=-EACCES"
     62 	       ", msg={len=%u, type=NLMSG_NOOP"
     63 	       ", flags=NLM_F_REQUEST, seq=0, pid=0}",
     64 	       msg_len, NLMSG_HDRLEN + 4);
     65 }
     66 
     67 int
     68 main(void)
     69 {
     70 	skip_if_unavailable("/proc/self/fd/");
     71 
     72 	static const uint8_t cookie[] = { 0xab, 0xfe };
     73 
     74 	const int fd = create_nl_socket(NETLINK_SOCK_DIAG);
     75 	const unsigned int hdrlen = sizeof(struct nlmsgerr);
     76 	void *const nlh0 = midtail_alloc(NLMSG_SPACE(hdrlen),
     77 			NLA_HDRLEN + sizeof(cookie));
     78 
     79 	TEST_NLATTR(fd, nlh0, hdrlen,
     80 		    init_nlmsgerr, print_nlmsgerr,
     81 		    NLMSGERR_ATTR_COOKIE,
     82 		    sizeof(cookie), cookie, sizeof(cookie),
     83 		    printf("[%u, %u]", cookie[0], cookie[1]);
     84 		    printf("}"));
     85 
     86 	printf("+++ exited with 0 +++\n");
     87 	return 0;
     88 }
     89