182 lines
6.3 KiB
C
182 lines
6.3 KiB
C
/*
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* Check decoding of SO_LINGER socket option.
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*
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* Copyright (c) 2017-2018 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <unistd.h>
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static const char *errstr;
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static int
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get_linger(int fd, void *val, socklen_t *len)
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{
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int rc = getsockopt(fd, SOL_SOCKET, SO_LINGER, val, len);
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errstr = sprintrc(rc);
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return rc;
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}
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static int
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set_linger(int fd, void *val, socklen_t len)
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{
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int rc = setsockopt(fd, SOL_SOCKET, SO_LINGER, val, len);
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errstr = sprintrc(rc);
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return rc;
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}
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int
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main(void)
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{
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TAIL_ALLOC_OBJECT_CONST_PTR(struct linger, linger);
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TAIL_ALLOC_OBJECT_CONST_PTR(socklen_t, len);
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const unsigned int sizeof_l_onoff = sizeof(linger->l_onoff);
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struct linger *const l_onoff = tail_alloc(sizeof_l_onoff);
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const unsigned int sizeof_l_onoff_truncated = sizeof_l_onoff - 1;
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struct linger *const l_onoff_truncated =
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tail_alloc(sizeof_l_onoff_truncated);
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const unsigned int sizeof_l_linger_truncated =
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offsetofend(struct linger, l_linger) - 1;
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struct linger *const l_linger_truncated =
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tail_alloc(sizeof_l_linger_truncated);
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int fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (fd < 0)
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perror_msg_and_skip("socket AF_UNIX SOCK_STREAM");
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/* classic getsockopt */
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*len = sizeof(*linger);
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get_linger(fd, linger, len);
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printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=%d, l_linger=%d}"
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", [%d]) = %s\n",
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fd, linger->l_onoff, linger->l_linger, *len, errstr);
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/* classic setsockopt */
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linger->l_onoff = -15;
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linger->l_linger = -42;
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set_linger(fd, linger, sizeof(*linger));
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printf("setsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=%d, l_linger=%d}"
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", %d) = %s\n",
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fd, linger->l_onoff, linger->l_linger,
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(unsigned int) sizeof(*linger), errstr);
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/* setsockopt with optlen larger than necessary */
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set_linger(fd, linger, sizeof(*linger) + 1);
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printf("setsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=%d, l_linger=%d}"
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", %d) = %s\n",
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fd, linger->l_onoff, linger->l_linger,
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(unsigned int) sizeof(*linger) + 1, errstr);
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/* setsockopt with optlen < 0 - EINVAL */
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set_linger(fd, linger, -1U);
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printf("setsockopt(%d, SOL_SOCKET, SO_LINGER, %p, -1) = %s\n",
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fd, linger, errstr);
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/* setsockopt with optlen smaller than necessary - EINVAL */
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set_linger(fd, linger, sizeof(linger->l_onoff));
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printf("setsockopt(%d, SOL_SOCKET, SO_LINGER, %p, %d) = %s\n",
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fd, linger, (unsigned int) sizeof(linger->l_onoff), errstr);
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/* setsockopt optval EFAULT */
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set_linger(fd, &linger->l_linger, sizeof(*linger));
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printf("setsockopt(%d, SOL_SOCKET, SO_LINGER, %p, %d) = %s\n",
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fd, &linger->l_linger, (unsigned int) sizeof(*linger), errstr);
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/* getsockopt with zero optlen */
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*len = 0;
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get_linger(fd, linger, len);
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printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, %p, [0]) = %s\n",
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fd, linger, errstr);
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/* getsockopt with optlen larger than necessary - shortened */
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*len = sizeof(*linger) + 1;
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get_linger(fd, linger, len);
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printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=%d, l_linger=%d}"
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", [%u->%d]) = %s\n",
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fd, linger->l_onoff, linger->l_linger,
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(unsigned int) sizeof(*linger) + 1, *len, errstr);
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/*
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* getsockopt with optlen less than sizeof(linger->l_onoff):
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* the part of struct linger.l_onoff is printed in hex.
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*/
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*len = sizeof_l_onoff_truncated;
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get_linger(fd, l_onoff_truncated, len);
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printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=", fd);
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print_quoted_hex(l_onoff_truncated, *len);
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printf("}, [%d]) = %s\n", *len, errstr);
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/*
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* getsockopt with optlen equals to sizeof(struct linger.l_onoff):
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* struct linger.l_linger is not printed.
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*/
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*len = sizeof_l_onoff;
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get_linger(fd, l_onoff, len);
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printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=%d}"
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", [%d]) = %s\n",
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fd, l_onoff->l_onoff, *len, errstr);
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/*
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* getsockopt with optlen greater than sizeof(struct linger.l_onoff)
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* but smaller than sizeof(struct linger):
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* the part of struct linger.l_linger is printed in hex.
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*/
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*len = sizeof_l_linger_truncated;
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get_linger(fd, l_linger_truncated, len);
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/*
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* Copy to a properly aligned structure to avoid unaligned access
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* to struct linger.l_onoff field.
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*/
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memcpy(linger, l_linger_truncated, sizeof_l_linger_truncated);
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printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, {l_onoff=%d, l_linger=",
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fd, linger->l_onoff);
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print_quoted_hex(&linger->l_linger, sizeof_l_linger_truncated -
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offsetof(struct linger, l_linger));
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printf("}, [%d]) = %s\n", *len, errstr);
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/* getsockopt optval EFAULT */
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*len = sizeof(*linger);
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get_linger(fd, &linger->l_linger, len);
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printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, %p, [%d]) = %s\n",
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fd, &linger->l_linger, *len, errstr);
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/* getsockopt optlen EFAULT */
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get_linger(fd, linger, len + 1);
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printf("getsockopt(%d, SOL_SOCKET, SO_LINGER, %p, %p) = %s\n",
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fd, linger, len + 1, errstr);
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puts("+++ exited with 0 +++");
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return 0;
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}
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