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-rw-r--r--ares/m4/cares-functions.m4260
1 files changed, 259 insertions, 1 deletions
diff --git a/ares/m4/cares-functions.m4 b/ares/m4/cares-functions.m4
index 0aa51f60f..5117788e3 100644
--- a/ares/m4/cares-functions.m4
+++ b/ares/m4/cares-functions.m4
@@ -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
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-26 15:06:27 +0000