tools/testing/selftests/net/af_unix/diag_uid.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/net/af_unix/diag_uid.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/net/af_unix/diag_uid.c
Extension
.c
Size
3517 bytes
Lines
178
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/* Copyright Amazon.com Inc. or its affiliates. */

#define _GNU_SOURCE
#include <sched.h>

#include <unistd.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/sock_diag.h>
#include <linux/unix_diag.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>

#include "kselftest_harness.h"

FIXTURE(diag_uid)
{
	int netlink_fd;
	int unix_fd;
	__u32 inode;
	__u64 cookie;
};

FIXTURE_VARIANT(diag_uid)
{
	int unshare;
	int udiag_show;
};

FIXTURE_VARIANT_ADD(diag_uid, uid)
{
	.unshare = 0,
	.udiag_show = UDIAG_SHOW_UID
};

FIXTURE_VARIANT_ADD(diag_uid, uid_unshare)
{
	.unshare = CLONE_NEWUSER,
	.udiag_show = UDIAG_SHOW_UID
};

FIXTURE_SETUP(diag_uid)
{
	struct stat file_stat;
	socklen_t optlen;
	int ret;

	if (variant->unshare)
		ASSERT_EQ(unshare(variant->unshare), 0);

	self->netlink_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG);
	ASSERT_NE(self->netlink_fd, -1);

	self->unix_fd = socket(AF_UNIX, SOCK_STREAM, 0);
	ASSERT_NE(self->unix_fd, -1);

	ret = fstat(self->unix_fd, &file_stat);
	ASSERT_EQ(ret, 0);

	self->inode = file_stat.st_ino;

	optlen = sizeof(self->cookie);
	ret = getsockopt(self->unix_fd, SOL_SOCKET, SO_COOKIE, &self->cookie, &optlen);
	ASSERT_EQ(ret, 0);
}

FIXTURE_TEARDOWN(diag_uid)
{
	close(self->netlink_fd);
	close(self->unix_fd);
}

int send_request(struct __test_metadata *_metadata,
		 FIXTURE_DATA(diag_uid) *self,
		 const FIXTURE_VARIANT(diag_uid) *variant)
{
	struct {
		struct nlmsghdr nlh;
		struct unix_diag_req udr;
	} req = {
		.nlh = {
			.nlmsg_len = sizeof(req),
			.nlmsg_type = SOCK_DIAG_BY_FAMILY,
			.nlmsg_flags = NLM_F_REQUEST
		},
		.udr = {
			.sdiag_family = AF_UNIX,

Annotation

Implementation Notes