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From e556b4067e0c4036e20fc26523e3b4d6d5c6be42 Mon Sep 17 00:00:00 2001
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From: Andreas Schneider <asn@samba.org>
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Date: Thu, 7 Oct 2021 15:55:37 +0200
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Subject: [PATCH] waf: Fix resolv_wrapper with glibc 2.34
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With glibc 2.34 we are not able to talk to the DNS server via socket_wrapper
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anymore. The res_* symbols have been moved from libresolv to libc. We are not
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able to intercept any traffic inside of libc.
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Signed-off-by: Andreas Schneider <asn@samba.org>
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Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
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Reviewed-by: Alexander Bokovoy <ab@samba.org>
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---
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selftest/wscript | 2 +-
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third_party/resolv_wrapper/wscript | 13 +++++++++++++
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2 files changed, 14 insertions(+), 1 deletion(-)
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diff --git a/selftest/wscript b/selftest/wscript
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index a6be06c2ae9..85d9338489a 100644
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--- a/selftest/wscript
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+++ b/selftest/wscript
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@@ -252,7 +252,7 @@ def cmd_testonly(opt):
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if os.environ.get('USE_NAMESPACES') is None:
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env.OPTIONS += " --socket_wrapper_so_path=" + CONFIG_GET(opt, 'LIBSOCKET_WRAPPER_SO_PATH')
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- if Utils.unversioned_sys_platform() in ('netbsd', 'openbsd', 'sunos'):
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+ if not CONFIG_SET(opt, 'HAVE_RESOLV_CONF_SUPPORT'):
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env.OPTIONS += " --use-dns-faking"
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if CONFIG_GET(opt, 'USING_SYSTEM_KRB5') and CONFIG_GET(opt, 'MIT_KDC_PATH'):
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diff --git a/third_party/resolv_wrapper/wscript b/third_party/resolv_wrapper/wscript
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index a7f18389b0f..7e369bd90b5 100644
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--- a/third_party/resolv_wrapper/wscript
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+++ b/third_party/resolv_wrapper/wscript
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@@ -1,6 +1,7 @@
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#!/usr/bin/env python
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import os
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+from waflib import Logs
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VERSION="1.1.7"
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@@ -49,6 +50,18 @@ def configure(conf):
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if conf.CONFIG_SET('HAVE_RES_NCLOSE'):
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conf.DEFINE('HAVE_RES_NCLOSE_IN_LIBRESOLV', 1)
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+ # If we find res_nquery in libc, we can't do resolv.conf redirect
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+ conf.CHECK_FUNCS('res_nquery __res_nquery')
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+ if (conf.CONFIG_SET('HAVE_RES_NQUERY')
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+ or conf.CONFIG_SET('HAVE___RES_NQUERY')):
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+ Logs.warn("Detection for resolv_wrapper: "
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+ "Only dns faking will be available")
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+ else:
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+ if conf.CHECK_FUNCS('res_nquery', lib='resolv'):
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+ conf.DEFINE('HAVE_RESOLV_CONF_SUPPORT', 1)
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+ if conf.CHECK_FUNCS('__res_nquery', lib='resolv'):
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+ conf.DEFINE('HAVE_RESOLV_CONF_SUPPORT', 1)
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+
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conf.CHECK_FUNCS_IN('res_init __res_init', 'resolv', checklibc=True)
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conf.CHECK_FUNCS_IN('res_ninit __res_ninit', 'resolv', checklibc=True)
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conf.CHECK_FUNCS_IN('res_close __res_close', 'resolv', checklibc=True)
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--
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2.33.1
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