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Initial attempt to detect at configuration time if the getaddrinfo()

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function returns an addrinfo with an unfreeable ai_addr member ptr.
pull/1/head
Yang Tse 16 years ago
parent c81480a998
commit ad60c2d0c3
2 changed files with 261 additions and 1 deletions
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  1. 2
      configure.ac
  2. 260
      m4/cares-functions.m4

2
configure.ac
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@ -553,6 +553,8 @@ CURL_CHECK_FUNC_RECVFROM
CURL_CHECK_FUNC_SEND
CURL_CHECK_MSG_NOSIGNAL
CARES_CHECK_FUNC_GETADDRINFO
CARES_CHECK_FUNC_GETADDRINFO_UNFREEABLE_AI_ADDR
CARES_CHECK_FUNC_GETHOSTNAME
CARES_CHECK_FUNC_GETSERVBYPORT_R
CARES_CHECK_FUNC_INET_NTOP

260
m4/cares-functions.m4
Unescape View File

@ -16,7 +16,7 @@
#***************************************************************************
# File version for 'aclocal' use. Keep it a single number.
# serial 10
# serial 11
dnl CARES_INCLUDES_ARPA_INET
@ -112,6 +112,27 @@ cares_includes_string="\
])
dnl CARES_INCLUDES_SYS_SOCKET
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
dnl included when sys/socket.h is to be included.
AC_DEFUN([CARES_INCLUDES_SYS_SOCKET], [
cares_includes_sys_socket="\
/* includes start */
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
/* includes end */"
AC_CHECK_HEADERS(
sys/types.h sys/socket.h,
[], [], [$cares_includes_sys_socket])
])
dnl CARES_INCLUDES_SYS_UIO
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
@ -182,6 +203,243 @@ cares_includes_winsock2="\
])
dnl CARES_INCLUDES_WS2TCPIP
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
dnl included when ws2tcpip.h is to be included.
AC_DEFUN([CARES_INCLUDES_WS2TCPIP], [
cares_includes_ws2tcpip="\
/* includes start */
#ifdef HAVE_WINDOWS_H
# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
# endif
# include <windows.h>
# ifdef HAVE_WINSOCK2_H
# include <winsock2.h>
# ifdef HAVE_WS2TCPIP_H
# include <ws2tcpip.h>
# endif
# endif
#endif
/* includes end */"
CURL_CHECK_HEADER_WINDOWS
CURL_CHECK_HEADER_WINSOCK2
CURL_CHECK_HEADER_WS2TCPIP
])
dnl CARES_CHECK_FUNC_GETADDRINFO
dnl -------------------------------------------------
dnl Verify if getaddrinfo is available, prototyped, can
dnl be compiled and seems to work. If all of these are
dnl true, and usage has not been previously disallowed
dnl with shell variable cares_disallow_getaddrinfo, then
dnl HAVE_GETADDRINFO will be defined.
AC_DEFUN([CARES_CHECK_FUNC_GETADDRINFO], [
AC_REQUIRE([CARES_INCLUDES_WS2TCPIP])dnl
AC_REQUIRE([CARES_INCLUDES_STDLIB])dnl
AC_REQUIRE([CARES_INCLUDES_SYS_SOCKET])dnl
AC_REQUIRE([CARES_INCLUDES_NETDB])dnl
#
tst_links_getaddrinfo="unknown"
tst_proto_getaddrinfo="unknown"
tst_compi_getaddrinfo="unknown"
tst_works_getaddrinfo="unknown"
tst_allow_getaddrinfo="unknown"
#
AC_MSG_CHECKING([if getaddrinfo can be linked])
AC_LINK_IFELSE([
AC_LANG_PROGRAM([[
$cares_includes_ws2tcpip
$cares_includes_sys_socket
$cares_includes_netdb
]],[[
if(0 != getaddrinfo(0, 0, 0, 0))
return 1;
]])
],[
AC_MSG_RESULT([yes])
tst_links_getaddrinfo="yes"
],[
AC_MSG_RESULT([no])
tst_links_getaddrinfo="no"
])
#
if test "$tst_links_getaddrinfo" = "yes"; then
AC_MSG_CHECKING([if getaddrinfo is prototyped])
AC_EGREP_CPP([getaddrinfo],[
$cares_includes_ws2tcpip
$cares_includes_sys_socket
$cares_includes_netdb
],[
AC_MSG_RESULT([yes])
tst_proto_getaddrinfo="yes"
],[
AC_MSG_RESULT([no])
tst_proto_getaddrinfo="no"
])
fi
#
if test "$tst_proto_getaddrinfo" = "yes"; then
AC_MSG_CHECKING([if getaddrinfo is compilable])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
$cares_includes_ws2tcpip
$cares_includes_sys_socket
$cares_includes_netdb
]],[[
if(0 != getaddrinfo(0, 0, 0, 0))
return 1;
]])
],[
AC_MSG_RESULT([yes])
tst_compi_getaddrinfo="yes"
],[
AC_MSG_RESULT([no])
tst_compi_getaddrinfo="no"
])
fi
#
dnl only do runtime verification when not cross-compiling
if test "x$cross_compiling" != "xyes" &&
test "$tst_compi_getaddrinfo" = "yes"; then
AC_MSG_CHECKING([if getaddrinfo seems to work])
AC_RUN_IFELSE([
AC_LANG_PROGRAM([[
$cares_includes_ws2tcpip
$cares_includes_stdlib
$cares_includes_sys_socket
$cares_includes_netdb
]],[[
struct addrinfo hints;
struct addrinfo *ai = 0;
int error;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_NUMERICHOST;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo("127.0.0.1", 0, &hints, &ai);
if(error || !ai)
exit(1); /* fail */
else
exit(0);
]])
],[
AC_MSG_RESULT([yes])
tst_works_getaddrinfo="yes"
],[
AC_MSG_RESULT([no])
tst_works_getaddrinfo="no"
])
fi
#
if test "$tst_compi_getaddrinfo" = "yes" &&
test "$tst_works_getaddrinfo" != "no"; then
AC_MSG_CHECKING([if getaddrinfo usage allowed])
if test "x$cares_disallow_getaddrinfo" != "xyes"; then
AC_MSG_RESULT([yes])
tst_allow_getaddrinfo="yes"
else
AC_MSG_RESULT([no])
tst_allow_getaddrinfo="no"
fi
fi
#
AC_MSG_CHECKING([if getaddrinfo might be used])
if test "$tst_links_getaddrinfo" = "yes" &&
test "$tst_proto_getaddrinfo" = "yes" &&
test "$tst_compi_getaddrinfo" = "yes" &&
test "$tst_allow_getaddrinfo" = "yes" &&
test "$tst_works_getaddrinfo" != "no"; then
AC_MSG_RESULT([yes])
AC_DEFINE_UNQUOTED(HAVE_GETADDRINFO, 1,
[Define to 1 if you have a working getaddrinfo function.])
ac_cv_func_getaddrinfo="yes"
else
AC_MSG_RESULT([no])
ac_cv_func_getaddrinfo="no"
fi
])
dnl CARES_CHECK_FUNC_GETADDRINFO_UNFREEABLE_AI_ADDR
dnl -------------------------------------------------
dnl verify if the ai_addr pointer member of the addrinfo
dnl struct returned by function getaddrinfo is a pointer
dnl which can actually be free()ed or not.
AC_DEFUN([CARES_CHECK_FUNC_GETADDRINFO_UNFREEABLE_AI_ADDR], [
AC_REQUIRE([CARES_CHECK_FUNC_GETADDRINFO])dnl
AC_REQUIRE([CARES_INCLUDES_STRING])dnl
#
if test "$ac_cv_func_getaddrinfo" = "yes"; then
AC_MSG_CHECKING([if getaddrinfo returns unfreeable ai_addr])
dnl only do runtime verification when not cross-compiling
if test "x$cross_compiling" != "xyes"; then
AC_RUN_IFELSE([
AC_LANG_PROGRAM([[
$cares_includes_ws2tcpip
$cares_includes_stdlib
$cares_includes_sys_socket
$cares_includes_netdb
$cares_includes_string
]],[[
struct sockaddr tmp_addr, *ai_addr, *freed_ptr;
struct addrinfo hints;
struct addrinfo *ai = 0;
int error;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_NUMERICHOST;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo("127.0.0.1", 0, &hints, &ai);
if(error || !ai)
/* should not happen, same test already succeeded, */
/* assume that returned ai_addr is not unfreeable. */
exit(0);
memset(&tmp_addr, 1, sizeof(tmp_addr));
/* attempt to free ai_addr pointer */
freed_ptr = ai_addr = ai->ai_addr;
/* seg-fault free'ing an unfreeable ptr would be */
/* nice, if this happen exit code will be non-zero. */
free(ai_addr);
/* attempt to write free'ed memory */
freed_ptr->sa_family = 'x';
/* attempt to reuse and clear free'ed memory */
ai_addr = calloc(1, sizeof(struct sockaddr));
/* attempt to read free'ed memory */
tmp_addr = *freed_ptr;
/* verify if everithing has worked */
if(tmp_addr.sa_family == 'x')
/* ai_addr might be unfreeable, ouch! */
exit(1);
else
/* ai_addr is certainly freeable */
exit(0);
]])
],[
dnl exit code was zero, getaddrinfo behaves nicely.
AC_MSG_RESULT([no])
],[
dnl exit code wasn't zero, getaddrinfo returns unfreeable ptr.
AC_MSG_RESULT([yes])
AC_DEFINE_UNQUOTED(HAVE_GETADDRINFO_UNFREEABLE_AI_ADDR, 1,
[Define to 1 if getaddrinfo returns unfreeable ai_addr pointer.])
])
else
dnl for cross-compiling a static check would be nice.
AC_MSG_RESULT([unknown])
fi
fi
])
dnl CARES_CHECK_FUNC_GETHOSTNAME
dnl -------------------------------------------------
dnl Verify if gethostname is available, prototyped, and

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