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Signed-off-by: Athenas Jimenez <athenas.jimenez.gonzalez@intel.com>
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COPYING.Apache-2.0
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Apache License
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Makefile.am
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EXTRA_DIST = COPYING.Apache-2.0 findstatic.pl
AM_CFLAGS = -g -Wall -W -Wformat-security -D_FORTIFY_SOURCE=2 -fno-common
bin_PROGRAMS = \
java
java_SOURCES = \
src/main.c \
src/filedesc.c
distclean-local:
rm -rf aclocal.m4 ar-lib autom4te.cache config.guess config.h.in config.h.in~ config.sub configure depcomp install-sh ltmain.sh m4 Makefile.in missing compile
install-exec-hook:
perl ${top_srcdir}/findstatic.pl ${top_builddir}/src/*.o | grep -v Checking ||:
autogen.sh
Executable
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#!/bin/sh
set -e
autoreconf --force --install --symlink --warnings=all
args="\
--sysconfdir=/etc \
--localstatedir=/var \
--prefix=/usr \
--enable-silent-rules"
./configure CFLAGS="-g -O1 $CFLAGS" $args "$@"
make clean
coding-style.txt
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The formatting part of the coding style is easy; we follow the linux kernel
style with one key exception:
if/else statements ALWAYS have {}'s, even if there is only 1 statement.
So
if (foo) {
bar();
}
the reason for this is that this is both less error-prone, and easier to put
temporary or permanent logging/etc statements inside the {}'s.
A note on error handling
========================
The software in this project is system critical software, to a degree where
failure really is not an option:
The impact of the application failing is VERY SIGNIFICANT.
For that reason, we need to take great care to get error handling robust,
and not make some medium level issue worse by failing the whole system.
Rule 1: In userspace, malloc() does not fail
--------------------------------------------
(The Thiago rule of memory management)
In userspace, malloc() simply does not fail.
"But But". We have 47 bits of address space to fill before malloc() would fail
due to being out of space. It just won't happen.
Because of this, we're not going to check for, or handle, malloc() failures.
For one, in practice all you can do is exit, and the next line after
malloc() will crash the program with the same effect.
And more than that, the error handling, that never will be used, complicates
the program code enormously and is impossible to test, and thus impossible
to get right.
Rule 2: Deal gracefully with expected failures
----------------------------------------------
Some kind of errors are actually expected, normal conditions, and should be
handled sensibly, business as usual. For example, the lack of configuration
file should be handled silently by just using the system defaults.
Rule 3: Correct unexpected failures
-----------------------------------
Other kind of errors are not expected. These kind of errors must be *fixed*
as part of the error handling, so that the system can return to an expected
situation. Just passing the error up the call chain is rarely the right
answer, that just passes the buck to a part of the software that knows even
less about how to properly correct the failure.
Example: If a configuration file was required, but none exists, the error
handling for this scenario should include writing out a reference
configuration file with default values filled in.
Example: If you really want to handle a memory allocation failure, you must
free at least as much memory as you tried to allocate to allow the system to
make progress in its execution.
configure.ac
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# -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
AC_PREREQ([2.66])
AC_INIT(usrbinjava, 2, dev@lists.clearlinux.org)
AM_INIT_AUTOMAKE([foreign -Wall -W subdir-objects])
AM_SILENT_RULES([yes])
AC_PROG_CC
AM_PROG_CC_C_O
AC_LANG(C)
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_HEADERS([config.h])
have_coverage=no
AC_ARG_ENABLE(coverage, AS_HELP_STRING([--enable-coverage], [enable test coverage]))
if test "x$enable_coverage" = "xyes" ; then
AC_CHECK_PROG(lcov_found, [lcov], [yes], [no])
if test "x$lcov_found" = xno ; then
AC_MSG_ERROR([*** lcov support requested but the program was not found])
else
lcov_version_major="`lcov --version | cut -d ' ' -f 4 | cut -d '.' -f 1`"
lcov_version_minor="`lcov --version | cut -d ' ' -f 4 | cut -d '.' -f 2`"
if test "$lcov_version_major" -eq 1 -a "$lcov_version_minor" -lt 10; then
AC_MSG_ERROR([*** lcov version is too old. 1.10 required])
else
have_coverage=yes
AC_DEFINE([COVERAGE], [1], [Coverage enabled])
fi
fi
fi
AM_CONDITIONAL([COVERAGE], [test "$have_coverage" = "yes"])
AC_CONFIG_FILES([Makefile])
AC_OUTPUT
AC_MSG_RESULT([
$PACKAGE_NAME $VERSION
========
prefix: ${prefix}
libdir: ${libdir}
sysconfdir: ${sysconfdir}
exec_prefix: ${exec_prefix}
bindir: ${bindir}
datarootdir: ${datarootdir}
compiler: ${CC}
cflags: ${CFLAGS}
ldflags: ${LDFLAGS}
])
findstatic.pl
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#!/usr/bin/perl -w
# find a list of fns and variables in the code that could be static
# usually called with something like this:
# findstatic.pl `find . -name "*.o"`
# Andrew Tridgell <tridge@samba.org>
use strict;
# use nm to find the symbols
my($saved_delim) = $/;
undef $/;
my($syms) = `nm -o @ARGV`;
$/ = $saved_delim;
my(@lines) = split(/\n/s, $syms);
my(%def);
my(%undef);
my(%stype);
my(%typemap) = (
"T" => "function",
"C" => "uninitialised variable",
"D" => "initialised variable"
);
# parse the symbols into defined and undefined
for (my($i)=0; $i <= $#lines; $i++) {
my($line) = $lines[$i];
if ($line =~ /(.*):[a-f0-9]* ([TCD]) (.*)/) {
my($fname) = $1;
my($symbol) = $3;
push(@{$def{$fname}}, $symbol);
$stype{$symbol} = $2;
}
if ($line =~ /(.*):\s* U (.*)/) {
my($fname) = $1;
my($symbol) = $2;
push(@{$undef{$fname}}, $symbol);
}
}
# look for defined symbols that are never referenced outside the place they
# are defined
foreach my $f (keys %def) {
print "Checking $f\n";
my($found_one) = 0;
foreach my $s (@{$def{$f}}) {
my($found) = 0;
foreach my $f2 (keys %undef) {
if ($f2 ne $f) {
foreach my $s2 (@{$undef{$f2}}) {
if ($s2 eq $s) {
$found = 1;
$found_one = 1;
}
}
}
}
if ($found == 0) {
my($t) = $typemap{$stype{$s}};
if ($s eq 'main') {
# special case: main program
$found_one = 1;
} else {
print " '$s' is unique to $f, should be static? ($t)\n";
}
}
}
if ($found_one == 0) {
print " all symbols in '$f' are unused (main program?)\n";
}
}
src/filedesc.c
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/*
* Software Updater - client side
*
* Copyright © 2012-2015 Intel Corporation.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 or later of the License.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Arjan van de Ven <arjan@linux.intel.com>
*
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
void dump_file_descriptor_leaks(void)
{
DIR *dir;
struct dirent *entry;
dir = opendir("/proc/self/fd");
if (!dir)
return;
while (1) {
char *filename;
char buffer[PATH_MAX + 1];
entry = readdir(dir);
size_t size;
if (!entry)
break;
if (strcmp(entry->d_name, ".") == 0)
continue;
if (strcmp(entry->d_name, "..") == 0)
continue;
/* skip stdin/out/err */
if (strcmp(entry->d_name, "0") == 0)
continue;
if (strcmp(entry->d_name, "1") == 0)
continue;
if (strcmp(entry->d_name, "2") == 0)
continue;
/* we hold an fd open, the one from opendir above */
sprintf(buffer, "%i", dirfd(dir));
if (strcmp(entry->d_name, buffer) == 0)
continue;
if (asprintf(&filename, "/proc/self/fd/%s", entry->d_name) <= 0)
abort();
memset(&buffer, 0, sizeof(buffer));
size = readlink(filename, buffer, PATH_MAX);
if (size)
printf("Possible filedescriptor leak : %s (%s)", entry->d_name, buffer);
free(filename);
}
closedir(dir);
}
src/main.c
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/*
* usrbinjava - java wrapper
*
* Copyright (C) 2015 Intel Corporation.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3, with OpenSSL-exception.
*
* Alternatively, you can chose to redistribute and/or modifiy this
* software under the terms of the Apache-2.0 license as published
* by the Apache Software Foundation.
*
* If you want to contribute code to this project using only one,
* instead of both, of these licenses, you need to remove the other
* license text from this file as part of your contribution.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* Likewise, you should have received a copy of the Apache-2.0 license,
* which can also be found at http://www.apache.org/licenses/LICENSE-2.0
*
* Authors:
* Arjan van de Ven <arjan@linux.intel.com>
*
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
int main(int argc, char **argv)
{
char java[4096];
strcpy(java, "/usr/bin/false");
return EXIT_SUCCESS;
}
template
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/*
* usrbinjava -- java wrapper
*
* Copyright (C) 2015 Intel Corporation.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3, with OpenSSL-exception.
*
* Alternatively, you can chose to redistribute and/or modifiy this
* software under the terms of the Apache-2.0 license as published
* by the Apache Software Foundation.
*
* If you want to contribute code to this project using only one,
* instead of both, of these licenses, you need to remove the other
* license text from this file as part of your contribution.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* Likewise, you should have received a copy of the Apache-2.0 license,
* which can also be found at http://www.apache.org/licenses/LICENSE-2.0
*
* Authors:
* Arjan van de Ven <arjan@linux.intel.com>
*
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>