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socket: Add the __sockaddr_un_set function

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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
(cherry picked from commit e368b12f6c)
This commit is contained in:
Florian Weimer 2022-01-17 10:21:34 +01:00 committed by Dmitry V. Levin
parent 6fd634e9b9
commit b10d5e62a6
4 changed files with 120 additions and 1 deletions
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12
include/sys/un.h
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@ -1 +1,13 @@
#include <socket/sys/un.h>
#ifndef _ISOMAC
/* Set ADDR->sun_family to AF_UNIX and ADDR->sun_path to PATHNAME.
Return 0 on success or -1 on failure (due to overlong PATHNAME).
The caller should always use sizeof (struct sockaddr_un) as the
socket address length, disregaring the length of PATHNAME.
Only concrete (non-abstract) pathnames are supported. */
int __sockaddr_un_set (struct sockaddr_un *addr, const char *pathname)
attribute_hidden;
#endif /* _ISOMAC */

6
socket/Makefile
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@ -29,10 +29,14 @@ headers := sys/socket.h sys/un.h bits/sockaddr.h bits/socket.h \
routines := accept bind connect getpeername getsockname getsockopt \
listen recv recvfrom recvmsg send sendmsg sendto \
setsockopt shutdown socket socketpair isfdtype opensock \
sockatmark accept4 recvmmsg sendmmsg
sockatmark accept4 recvmmsg sendmmsg sockaddr_un_set
tests := tst-accept4
tests-internal := \
tst-sockaddr_un_set \
# tests-internal
aux := sa_len
include ../Rules

41
socket/sockaddr_un_set.c Normal file
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@ -0,0 +1,41 @@
/* Set the sun_path member of struct sockaddr_un.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
int
__sockaddr_un_set (struct sockaddr_un *addr, const char *pathname)
{
size_t name_length = strlen (pathname);
/* The kernel supports names of exactly sizeof (addr->sun_path)
bytes, without a null terminator, but userspace does not; see the
SUN_LEN macro. */
if (name_length >= sizeof (addr->sun_path))
{
__set_errno (EINVAL); /* Error code used by the kernel. */
return -1;
}
addr->sun_family = AF_UNIX;
memcpy (addr->sun_path, pathname, name_length + 1);
return 0;
}

62
socket/tst-sockaddr_un_set.c Normal file
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@ -0,0 +1,62 @@
/* Test the __sockaddr_un_set function.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* Re-compile the function because the version in libc is not
exported. */
#include "sockaddr_un_set.c"
#include <support/check.h>
static int
do_test (void)
{
struct sockaddr_un sun;
memset (&sun, 0xcc, sizeof (sun));
__sockaddr_un_set (&sun, "");
TEST_COMPARE (sun.sun_family, AF_UNIX);
TEST_COMPARE (__sockaddr_un_set (&sun, ""), 0);
memset (&sun, 0xcc, sizeof (sun));
TEST_COMPARE (__sockaddr_un_set (&sun, "/example"), 0);
TEST_COMPARE_STRING (sun.sun_path, "/example");
{
char pathname[108]; /* Length of sun_path (ABI constant). */
memset (pathname, 'x', sizeof (pathname));
pathname[sizeof (pathname) - 1] = '\0';
memset (&sun, 0xcc, sizeof (sun));
TEST_COMPARE (__sockaddr_un_set (&sun, pathname), 0);
TEST_COMPARE (sun.sun_family, AF_UNIX);
TEST_COMPARE_STRING (sun.sun_path, pathname);
}
{
char pathname[109];
memset (pathname, 'x', sizeof (pathname));
pathname[sizeof (pathname) - 1] = '\0';
memset (&sun, 0xcc, sizeof (sun));
errno = 0;
TEST_COMPARE (__sockaddr_un_set (&sun, pathname), -1);
TEST_COMPARE (errno, EINVAL);
}
return 0;
}
#include <support/test-driver.c>