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/*
* Check decoding of getsockopt and setsockopt for SOL_NETLINK level.
*
* Copyright (c) 2017-2023 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2017-2024 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "netlink.h"
#include <stdio.h>
#ifndef SOL_NETLINK
# define SOL_NETLINK 270
#endif
static int rc;
static const char *errstr;
static int
get_sockopt(int fd, int name, void *val, socklen_t *len)
{
rc = getsockopt(fd, SOL_NETLINK, name, val, len);
errstr = sprintrc(rc);
return rc;
}
static int
set_sockopt(int fd, int name, void *val, socklen_t len)
{
rc = setsockopt(fd, SOL_NETLINK, name, val, len);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
static const struct strival32 names[] = {
#ifdef NETLINK_ADD_MEMBERSHIP
{ ARG_STR(NETLINK_ADD_MEMBERSHIP) },
#endif
#ifdef NETLINK_DROP_MEMBERSHIP
{ ARG_STR(NETLINK_DROP_MEMBERSHIP) },
#endif
#ifdef NETLINK_PKTINFO
{ ARG_STR(NETLINK_PKTINFO) },
#endif
#ifdef NETLINK_BROADCAST_ERROR
{ ARG_STR(NETLINK_BROADCAST_ERROR) },
#endif
#ifdef NETLINK_NO_ENOBUFS
{ ARG_STR(NETLINK_NO_ENOBUFS) },
#endif
#ifdef NETLINK_RX_RING
{ ARG_STR(NETLINK_RX_RING) },
#endif
#ifdef NETLINK_TX_RING
{ ARG_STR(NETLINK_TX_RING) },
#endif
#ifdef NETLINK_LISTEN_ALL_NSID
{ ARG_STR(NETLINK_LISTEN_ALL_NSID) },
#endif
#ifdef NETLINK_LIST_MEMBERSHIPS
{ ARG_STR(NETLINK_LIST_MEMBERSHIPS) },
#endif
#ifdef NETLINK_CAP_ACK
{ ARG_STR(NETLINK_CAP_ACK) },
#endif
#ifdef NETLINK_EXT_ACK
{ ARG_STR(NETLINK_EXT_ACK) },
#endif
};
TAIL_ALLOC_OBJECT_CONST_PTR(int, val);
TAIL_ALLOC_OBJECT_CONST_PTR(socklen_t, len);
void *const efault = val + 1;
int fd = socket(AF_NETLINK, SOCK_RAW, 0);
if (fd < 0)
perror_msg_and_skip("socket AF_NETLINK SOCK_RAW");
for (unsigned int i = 0; i < ARRAY_SIZE(names); ++i) {
/* getsockopt */
/* classic */
*len = sizeof(*val);
get_sockopt(fd, names[i].val, val, len);
printf("getsockopt(%d, SOL_NETLINK, %s, ", fd, names[i].str);
if (rc)
printf("%p", val);
else
printf("[%d]", *val);
printf(", [%d", (int) sizeof(*val));
if ((int) sizeof(*val) != *len)
printf(" => %d", *len);
printf("]) = %s\n", errstr);
/* optlen larger than necessary - shortened */
*len = sizeof(*val) + 1;
get_sockopt(fd, names[i].val, val, len);
printf("getsockopt(%d, SOL_NETLINK, %s, ", fd, names[i].str);
if (rc)
printf("%p", val);
else
printf("[%d]", *val);
printf(", [%d", (int) sizeof(*val) + 1);
if ((int) sizeof(*val) + 1 != *len)
printf(" => %d", *len);
printf("]) = %s\n", errstr);
/* zero optlen - print returned optlen */
*len = 0;
get_sockopt(fd, names[i].val, NULL, len);
printf("getsockopt(%d, SOL_NETLINK, %s, NULL, [0",
fd, names[i].str);
if (*len)
printf(" => %d", *len);
printf("]) = %s\n", errstr);
#ifdef NETLINK_LIST_MEMBERSHIPS
if (names[i].val != NETLINK_LIST_MEMBERSHIPS) {
#endif
/* optlen shorter than necessary - print address */
*len = sizeof(*val) - 1;
get_sockopt(fd, names[i].val, val, len);
printf("getsockopt(%d, SOL_NETLINK, %s, %p, [%d",
fd, names[i].str, val, (int) sizeof(*val) - 1);
if ((int) sizeof(*val) - 1 != *len)
printf(" => %d", *len);
printf("]) = %s\n", errstr);
#ifdef NETLINK_LIST_MEMBERSHIPS
} else {
/* optlen shorter than required for the first element */
*len = sizeof(*val) - 1;
get_sockopt(fd, names[i].val, efault, len);
printf("getsockopt(%d, SOL_NETLINK, %s, ",
fd, names[i].str);
if (rc)
printf("%p", efault);
else
printf("[]");
printf(", [%d", (int) sizeof(*val) - 1);
if ((int) sizeof(*val) - 1 != *len)
printf(" => %d", *len);
printf("]) = %s\n", errstr);
}
#endif
/* optval EFAULT - print address */
*len = sizeof(*val);
get_sockopt(fd, names[i].val, efault, len);
printf("getsockopt(%d, SOL_NETLINK, %s, %p",
fd, names[i].str, efault);
printf(", [%d", (int) sizeof(*val));
if ((int) sizeof(*val) != *len)
printf(" => %d", *len);
printf("]) = %s\n", errstr);
/* optlen EFAULT - print address */
get_sockopt(fd, names[i].val, val, len + 1);
printf("getsockopt(%d, SOL_NETLINK, %s, %p, %p) = %s\n",
fd, names[i].str, val, len + 1, errstr);
/* setsockopt */
/* classic */
*val = 0xdefaced;
set_sockopt(fd, names[i].val, val, sizeof(*val));
printf("setsockopt(%d, SOL_NETLINK, %s, [%d], %d) = %s\n",
fd, names[i].str, *val, (int) sizeof(*val), errstr);
/* optlen larger than necessary - shortened */
set_sockopt(fd, names[i].val, val, sizeof(*val) + 1);
printf("setsockopt(%d, SOL_NETLINK, %s, [%d], %d) = %s\n",
fd, names[i].str, *val, (int) sizeof(*val) + 1, errstr);
/* optlen < 0 - print address */
set_sockopt(fd, names[i].val, val, -1U);
printf("setsockopt(%d, SOL_NETLINK, %s, %p, -1) = %s\n",
fd, names[i].str, val, errstr);
/* optlen smaller than necessary - print address */
set_sockopt(fd, names[i].val, val, sizeof(*val) - 1);
printf("setsockopt(%d, SOL_NETLINK, %s, %p, %d) = %s\n",
fd, names[i].str, val, (int) sizeof(*val) - 1, errstr);
/* optval EFAULT - print address */
set_sockopt(fd, names[i].val, efault, sizeof(*val));
printf("setsockopt(%d, SOL_NETLINK, %s, %p, %d) = %s\n",
fd, names[i].str, efault, (int) sizeof(*val), errstr);
}
puts("+++ exited with 0 +++");
return 0;
}
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