glibc/sysdeps/unix/sysv/linux/netlink_assert_response.c
Paul Eggert 5a82c74822 Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:

sed -ri '
  s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
  s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
  $(find $(git ls-files) -prune -type f \
      ! -name '*.po' \
      ! -name 'ChangeLog*' \
      ! -path COPYING ! -path COPYING.LIB \
      ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
      ! -path manual/texinfo.tex ! -path scripts/config.guess \
      ! -path scripts/config.sub ! -path scripts/install-sh \
      ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
      ! -path INSTALL ! -path  locale/programs/charmap-kw.h \
      ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
      ! '(' -name configure \
            -execdir test -f configure.ac -o -f configure.in ';' ')' \
      ! '(' -name preconfigure \
            -execdir test -f preconfigure.ac ';' ')' \
      -print)

and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:

  chmod a+x sysdeps/unix/sysv/linux/riscv/configure
  # Omit irrelevant whitespace and comment-only changes,
  # perhaps from a slightly-different Autoconf version.
  git checkout -f \
    sysdeps/csky/configure \
    sysdeps/hppa/configure \
    sysdeps/riscv/configure \
    sysdeps/unix/sysv/linux/csky/configure
  # Omit changes that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
  git checkout -f \
    sysdeps/powerpc/powerpc64/ppc-mcount.S \
    sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
  # Omit change that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
  git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 02:43:31 -07:00

106 lines
3.7 KiB
C

/* Check recvmsg results for netlink sockets.
Copyright (C) 2015-2019 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 <fcntl.h>
#include <stdio.h>
#include <sys/socket.h>
#include "netlinkaccess.h"
static int
get_address_family (int fd)
{
struct sockaddr_storage sa;
socklen_t sa_len = sizeof (sa);
if (__getsockname (fd, (struct sockaddr *) &sa, &sa_len) < 0)
return -1;
/* Check that the socket family number is preserved despite in-band
signaling. */
_Static_assert (sizeof (sa.ss_family) < sizeof (int), "address family size");
_Static_assert (0 < (__typeof__ (sa.ss_family)) -1,
"address family unsigned");
return sa.ss_family;
}
void
__netlink_assert_response (int fd, ssize_t result)
{
if (result < 0)
{
/* Check if the error is unexpected. */
bool terminate = false;
int error_code = errno;
int family = get_address_family (fd);
if (family != AF_NETLINK)
/* If the address family does not match (or getsockname
failed), report the original error. */
terminate = true;
else if (error_code == EBADF
|| error_code == ENOTCONN
|| error_code == ENOTSOCK
|| error_code == ECONNREFUSED)
/* These errors indicate that the descriptor is not a
connected socket. */
terminate = true;
else if (error_code == EAGAIN || error_code == EWOULDBLOCK)
{
/* The kernel might return EAGAIN for other reasons than a
non-blocking socket. But if the socket is not blocking,
it is not ours, so report the error. */
int mode = __fcntl (fd, F_GETFL, 0);
if (mode < 0 || (mode & O_NONBLOCK) != 0)
terminate = true;
}
if (terminate)
{
char message[200];
if (family < 0)
__snprintf (message, sizeof (message),
"Unexpected error %d on netlink descriptor %d.\n",
error_code, fd);
else
__snprintf (message, sizeof (message),
"Unexpected error %d on netlink descriptor %d"
" (address family %d).\n",
error_code, fd, family);
__libc_fatal (message);
}
else
/* Restore orignal errno value. */
__set_errno (error_code);
}
else if (result < sizeof (struct nlmsghdr))
{
char message[200];
int family = get_address_family (fd);
if (family < 0)
__snprintf (message, sizeof (message),
"Unexpected netlink response of size %zd"
" on descriptor %d\n",
result, fd);
else
__snprintf (message, sizeof (message),
"Unexpected netlink response of size %zd"
" on descriptor %d (address family %d)\n",
result, fd, family);
__libc_fatal (message);
}
}
libc_hidden_def (__netlink_assert_response)