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A C library for asynchronous DNS requests (grpc依赖)
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c-ares/m4/xc-val-flgs.m4

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Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
#---------------------------------------------------------------------------
#
# xc-val-flgs.m4
#
provide SPDX identifiers and a REUSE CI job to verify All files have their licence and copyright information clearly identifiable. If not in the file header, they are set separately in .reuse/dep5. All used license texts are provided in LICENSES/
1 year ago
# Copyright (c) Daniel Stenberg <daniel@haxx.se>
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
provide SPDX identifiers and a REUSE CI job to verify All files have their licence and copyright information clearly identifiable. If not in the file header, they are set separately in .reuse/dep5. All used license texts are provided in LICENSES/
1 year ago
#
# SPDX-License-Identifier: MIT
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
#---------------------------------------------------------------------------
# serial 1
dnl _XC_CHECK_VAR_LIBS
dnl -------------------------------------------------
dnl Private macro.
AC_DEFUN([_XC_CHECK_VAR_LIBS], [
xc_bad_var_libs=no
for xc_word in $LIBS; do
case "$xc_word" in
-l* | --library=*)
:
;;
*)
xc_bad_var_libs=yes
;;
esac
done
if test $xc_bad_var_libs = yes; then
AC_MSG_NOTICE([using LIBS: $LIBS])
AC_MSG_NOTICE([LIBS error: LIBS may only be used to specify libraries (-lname).])
fi
])
dnl _XC_CHECK_VAR_LDFLAGS
dnl -------------------------------------------------
dnl Private macro.
AC_DEFUN([_XC_CHECK_VAR_LDFLAGS], [
xc_bad_var_ldflags=no
for xc_word in $LDFLAGS; do
case "$xc_word" in
-D*)
xc_bad_var_ldflags=yes
;;
-U*)
xc_bad_var_ldflags=yes
;;
-I*)
xc_bad_var_ldflags=yes
;;
-l* | --library=*)
xc_bad_var_ldflags=yes
;;
esac
done
if test $xc_bad_var_ldflags = yes; then
AC_MSG_NOTICE([using LDFLAGS: $LDFLAGS])
xc_bad_var_msg="LDFLAGS error: LDFLAGS may only be used to specify linker flags, not"
for xc_word in $LDFLAGS; do
case "$xc_word" in
-D*)
AC_MSG_NOTICE([$xc_bad_var_msg macro definitions. Use CPPFLAGS for: $xc_word])
;;
-U*)
AC_MSG_NOTICE([$xc_bad_var_msg macro suppressions. Use CPPFLAGS for: $xc_word])
;;
-I*)
AC_MSG_NOTICE([$xc_bad_var_msg include directories. Use CPPFLAGS for: $xc_word])
;;
-l* | --library=*)
AC_MSG_NOTICE([$xc_bad_var_msg libraries. Use LIBS for: $xc_word])
;;
esac
done
fi
])
dnl _XC_CHECK_VAR_CPPFLAGS
dnl -------------------------------------------------
dnl Private macro.
AC_DEFUN([_XC_CHECK_VAR_CPPFLAGS], [
xc_bad_var_cppflags=no
for xc_word in $CPPFLAGS; do
case "$xc_word" in
-rpath*)
xc_bad_var_cppflags=yes
;;
-L* | --library-path=*)
xc_bad_var_cppflags=yes
;;
-l* | --library=*)
xc_bad_var_cppflags=yes
;;
esac
done
if test $xc_bad_var_cppflags = yes; then
AC_MSG_NOTICE([using CPPFLAGS: $CPPFLAGS])
xc_bad_var_msg="CPPFLAGS error: CPPFLAGS may only be used to specify C preprocessor flags, not"
for xc_word in $CPPFLAGS; do
case "$xc_word" in
-rpath*)
AC_MSG_NOTICE([$xc_bad_var_msg library runtime directories. Use LDFLAGS for: $xc_word])
;;
-L* | --library-path=*)
AC_MSG_NOTICE([$xc_bad_var_msg library directories. Use LDFLAGS for: $xc_word])
;;
-l* | --library=*)
AC_MSG_NOTICE([$xc_bad_var_msg libraries. Use LIBS for: $xc_word])
;;
esac
done
fi
])
dnl _XC_CHECK_VAR_CFLAGS
dnl -------------------------------------------------
dnl Private macro.
AC_DEFUN([_XC_CHECK_VAR_CFLAGS], [
xc_bad_var_cflags=no
for xc_word in $CFLAGS; do
case "$xc_word" in
-D*)
xc_bad_var_cflags=yes
;;
-U*)
xc_bad_var_cflags=yes
;;
-I*)
xc_bad_var_cflags=yes
;;
-rpath*)
xc_bad_var_cflags=yes
;;
-L* | --library-path=*)
xc_bad_var_cflags=yes
;;
-l* | --library=*)
xc_bad_var_cflags=yes
;;
esac
done
if test $xc_bad_var_cflags = yes; then
AC_MSG_NOTICE([using CFLAGS: $CFLAGS])
xc_bad_var_msg="CFLAGS error: CFLAGS may only be used to specify C compiler flags, not"
for xc_word in $CFLAGS; do
case "$xc_word" in
-D*)
AC_MSG_NOTICE([$xc_bad_var_msg macro definitions. Use CPPFLAGS for: $xc_word])
;;
-U*)
AC_MSG_NOTICE([$xc_bad_var_msg macro suppressions. Use CPPFLAGS for: $xc_word])
;;
-I*)
AC_MSG_NOTICE([$xc_bad_var_msg include directories. Use CPPFLAGS for: $xc_word])
;;
-rpath*)
AC_MSG_NOTICE([$xc_bad_var_msg library runtime directories. Use LDFLAGS for: $xc_word])
;;
-L* | --library-path=*)
AC_MSG_NOTICE([$xc_bad_var_msg library directories. Use LDFLAGS for: $xc_word])
;;
-l* | --library=*)
AC_MSG_NOTICE([$xc_bad_var_msg libraries. Use LIBS for: $xc_word])
;;
esac
done
fi
])
dnl XC_CHECK_USER_FLAGS
dnl -------------------------------------------------
dnl Public macro.
dnl
dnl Performs some sanity checks for LIBS, LDFLAGS,
dnl CPPFLAGS and CFLAGS values that the user might
dnl have set. When checks fails, user is noticed
dnl about errors detected in all of them and script
dnl execution is halted.
dnl
dnl Intended to be used early in configure script.
AC_DEFUN([XC_CHECK_USER_FLAGS], [
AC_PREREQ([2.50])dnl
AC_BEFORE([$0],[XC_CHECK_PROG_CC])dnl
dnl check order below matters
_XC_CHECK_VAR_LIBS
_XC_CHECK_VAR_LDFLAGS
_XC_CHECK_VAR_CPPFLAGS
_XC_CHECK_VAR_CFLAGS
if test $xc_bad_var_libs = yes ||
test $xc_bad_var_cflags = yes ||
test $xc_bad_var_ldflags = yes ||
test $xc_bad_var_cppflags = yes; then
AC_MSG_ERROR([Can not continue. Fix errors mentioned immediately above this line.])
fi
])
dnl XC_CHECK_BUILD_FLAGS
dnl -------------------------------------------------
dnl Public macro.
dnl
dnl Performs some sanity checks for LIBS, LDFLAGS,
dnl CPPFLAGS and CFLAGS values that the configure
dnl script might have set. When checks fails, user
dnl is noticed about errors detected in all of them
dnl but script continues execution.
dnl
dnl Intended to be used very late in configure script.
AC_DEFUN([XC_CHECK_BUILD_FLAGS], [
AC_PREREQ([2.50])dnl
dnl check order below matters
_XC_CHECK_VAR_LIBS
_XC_CHECK_VAR_LDFLAGS
_XC_CHECK_VAR_CPPFLAGS
_XC_CHECK_VAR_CFLAGS
if test $xc_bad_var_libs = yes ||
test $xc_bad_var_cflags = yes ||
test $xc_bad_var_ldflags = yes ||
test $xc_bad_var_cppflags = yes; then
AC_MSG_WARN([Continuing even with errors mentioned immediately above this line.])
fi
])