Fix various issues which cause problems under musl.

Upstream-Status: Backport [bd1326ba7d68df38c5ccaafd2403a5fb30bd452b]
Signed-off-by: Ross Burton <ross.burton@intel.com>

From 630516bcc0233b047f65665c003201ba6e77453d Mon Sep 17 00:00:00 2001
From: Ross Burton <ross.burton@intel.com>
Date: Tue, 9 Aug 2016 16:22:36 +0100
Subject: [PATCH 1/3] Use AC_USE_SYSTEM_EXTENSIONS

Instead of using #define _GNU_SOURCE in some source files which causes problems
when building with musl as more files need the define, simply use
AC_USE_SYSTEM_EXTENSIONS in configure.ac to get it defined globally.
---
 configure.ac       | 1 +
 gdhcp/client.c     | 1 -
 plugins/tist.c     | 1 -
 src/backtrace.c    | 1 -
 src/inet.c         | 1 -
 src/log.c          | 1 -
 src/ntp.c          | 1 -
 src/resolver.c     | 1 -
 src/rfkill.c       | 1 -
 src/stats.c        | 1 -
 src/timezone.c     | 1 -
 tools/stats-tool.c | 1 -
 tools/tap-test.c   | 1 -
 tools/wispr.c      | 1 -
 vpn/plugins/vpn.c  | 1 -
 15 files changed, 1 insertion(+), 14 deletions(-)

diff --git a/configure.ac b/configure.ac
index 6e66ab3..bacf5ec 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,6 +20,7 @@ AC_SUBST(abs_top_srcdir)
 AC_SUBST(abs_top_builddir)
 
 AC_LANG_C
+AC_USE_SYSTEM_EXTENSIONS
 
 AC_PROG_CC
 AM_PROG_CC_C_O
diff --git a/gdhcp/client.c b/gdhcp/client.c
index fbb40ab..3aeb089 100644
--- a/gdhcp/client.c
+++ b/gdhcp/client.c
@@ -23,7 +23,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <errno.h>
 #include <unistd.h>
diff --git a/plugins/tist.c b/plugins/tist.c
index ad5ef79..cc2800a 100644
--- a/plugins/tist.c
+++ b/plugins/tist.c
@@ -23,7 +23,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <stdbool.h>
 #include <stdlib.h>
diff --git a/src/backtrace.c b/src/backtrace.c
index 6a66c0a..4dbdda8 100644
--- a/src/backtrace.c
+++ b/src/backtrace.c
@@ -24,7 +24,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
diff --git a/src/inet.c b/src/inet.c
index 69ded19..81d92c2 100644
--- a/src/inet.c
+++ b/src/inet.c
@@ -25,7 +25,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <errno.h>
 #include <unistd.h>
diff --git a/src/log.c b/src/log.c
index 9bae4a3..f7e82e5 100644
--- a/src/log.c
+++ b/src/log.c
@@ -23,7 +23,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <unistd.h>
 #include <stdarg.h>
diff --git a/src/ntp.c b/src/ntp.c
index dd246eb..db8ae96 100644
--- a/src/ntp.c
+++ b/src/ntp.c
@@ -23,7 +23,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
diff --git a/src/resolver.c b/src/resolver.c
index fbe4be7..ef61f92 100644
--- a/src/resolver.c
+++ b/src/resolver.c
@@ -23,7 +23,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <errno.h>
 #include <fcntl.h>
diff --git a/src/rfkill.c b/src/rfkill.c
index 2bfb092..af49d12 100644
--- a/src/rfkill.c
+++ b/src/rfkill.c
@@ -23,7 +23,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <errno.h>
 #include <fcntl.h>
diff --git a/src/stats.c b/src/stats.c
index 26343b1..cfcdc94 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -23,7 +23,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <errno.h>
 #include <sys/mman.h>
 #include <sys/types.h>
diff --git a/src/timezone.c b/src/timezone.c
index e346b11..8e91267 100644
--- a/src/timezone.c
+++ b/src/timezone.c
@@ -23,7 +23,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <errno.h>
 #include <stdio.h>
 #include <fcntl.h>
diff --git a/tools/stats-tool.c b/tools/stats-tool.c
index b076478..428d94b 100644
--- a/tools/stats-tool.c
+++ b/tools/stats-tool.c
@@ -22,7 +22,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <sys/mman.h>
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/tools/tap-test.c b/tools/tap-test.c
index fdc098a..57917f5 100644
--- a/tools/tap-test.c
+++ b/tools/tap-test.c
@@ -23,7 +23,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <errno.h>
 #include <fcntl.h>
diff --git a/tools/wispr.c b/tools/wispr.c
index d5f9341..e56dfc1 100644
--- a/tools/wispr.c
+++ b/tools/wispr.c
@@ -23,7 +23,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <fcntl.h>
 #include <unistd.h>
diff --git a/vpn/plugins/vpn.c b/vpn/plugins/vpn.c
index 9a42385..479c3a7 100644
--- a/vpn/plugins/vpn.c
+++ b/vpn/plugins/vpn.c
@@ -23,7 +23,6 @@
 #include <config.h>
 #endif
 
-#define _GNU_SOURCE
 #include <string.h>
 #include <fcntl.h>
 #include <unistd.h>
-- 
2.8.1


From b8b7878e6cb2a1ed4fcfa256f7e232511a40e3d9 Mon Sep 17 00:00:00 2001
From: Ross Burton <ross.burton@intel.com>
Date: Tue, 9 Aug 2016 15:37:50 +0100
Subject: [PATCH 2/3] Check for in6_pktinfo.ipi6_addr explicitly

Instead of assuming that just glibc has this structure, check for it at
configure as musl also has it.

Based on work by Khem Raj <raj.khem@gmail.com>.
---
 configure.ac   | 2 ++
 gdhcp/common.h | 5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index bacf5ec..ad00456 100644
--- a/configure.ac
+++ b/configure.ac
@@ -186,6 +186,8 @@ AC_CHECK_LIB(resolv, ns_initparse, dummy=yes, [
 AC_CHECK_HEADERS([execinfo.h])
 AM_CONDITIONAL([BACKTRACE], [test "${ac_cv_header_execinfo_h}" = "yes"])
 
+AC_CHECK_MEMBERS([struct in6_pktinfo.ipi6_addr], [], [], [[#include <netinet/in.h>]])
+
 AC_CHECK_FUNC(signalfd, dummy=yes,
 			AC_MSG_ERROR(signalfd support is required))
 
diff --git a/gdhcp/common.h b/gdhcp/common.h
index 75abc18..6899499 100644
--- a/gdhcp/common.h
+++ b/gdhcp/common.h
@@ -19,6 +19,7 @@
  *
  */
 
+#include <config.h>
 #include <netinet/udp.h>
 #include <netinet/ip.h>
 
@@ -170,8 +171,8 @@ static const uint8_t dhcp_option_lengths[] = {
 	[OPTION_U32]	= 4,
 };
 
-/* already defined within netinet/in.h if using GNU compiler */
-#ifndef __USE_GNU
+/* already defined within netinet/in.h if using glibc or musl */
+#ifndef HAVE_STRUCT_IN6_PKTINFO_IPI6_ADDR
 struct in6_pktinfo {
 	struct in6_addr ipi6_addr;  /* src/dst IPv6 address */
 	unsigned int ipi6_ifindex;  /* send/recv interface index */
-- 
2.8.1


From c0726e432fa0274a2b9c70179b03df6720972816 Mon Sep 17 00:00:00 2001
From: Ross Burton <ross.burton@intel.com>
Date: Tue, 9 Aug 2016 15:19:23 +0100
Subject: [PATCH 3/3] Rationalise includes

gweb/gresolv.c uses snprintf() and isspace() so it should include stdio.h and
ctype.h.

tools/dnsproxy-test uses functions from stdio.h.

musl warns when sys/ headers are included when the non-sys form should be used,
so switch sys/errno.h and so on to errno.h.

musl also causes redefinition errors when pieces of the networking headers are
included, so remove the redundant includes.

Based on work by Khem Raj <raj.khem@gmail.com>.
---
 gweb/gresolv.c               | 2 ++
 plugins/wifi.c               | 3 +--
 src/ippool.c                 | 1 -
 src/iptables.c               | 2 +-
 src/tethering.c              | 2 --
 tools/dhcp-test.c            | 1 -
 tools/dnsproxy-test.c        | 1 +
 tools/private-network-test.c | 2 +-
 tools/tap-test.c             | 2 +-
 9 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/gweb/gresolv.c b/gweb/gresolv.c
index 8a51a9f..d55027c 100644
--- a/gweb/gresolv.c
+++ b/gweb/gresolv.c
@@ -29,6 +29,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <resolv.h>
+#include <stdio.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netdb.h>
diff --git a/plugins/wifi.c b/plugins/wifi.c
index 9d56671..148131d 100644
--- a/plugins/wifi.c
+++ b/plugins/wifi.c
@@ -30,9 +30,8 @@
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
-#include <linux/if_arp.h>
-#include <linux/wireless.h>
 #include <net/ethernet.h>
+#include <linux/wireless.h>
 
 #ifndef IFF_LOWER_UP
 #define IFF_LOWER_UP	0x10000
diff --git a/src/ippool.c b/src/ippool.c
index cea1dcc..8a645da 100644
--- a/src/ippool.c
+++ b/src/ippool.c
@@ -28,7 +28,6 @@
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
-#include <sys/errno.h>
 #include <sys/socket.h>
 
 #include "connman.h"
diff --git a/src/iptables.c b/src/iptables.c
index 5ef757a..82e3ac4 100644
--- a/src/iptables.c
+++ b/src/iptables.c
@@ -28,7 +28,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
-#include <sys/errno.h>
+#include <errno.h>
 #include <sys/socket.h>
 #include <xtables.h>
 #include <inttypes.h>
diff --git a/src/tethering.c b/src/tethering.c
index 3153349..ad062d5 100644
--- a/src/tethering.c
+++ b/src/tethering.c
@@ -31,10 +31,8 @@
 #include <stdio.h>
 #include <sys/ioctl.h>
 #include <net/if.h>
-#include <linux/sockios.h>
 #include <string.h>
 #include <fcntl.h>
-#include <linux/if_tun.h>
 #include <netinet/in.h>
 #include <linux/if_bridge.h>
 
diff --git a/tools/dhcp-test.c b/tools/dhcp-test.c
index c34e10a..eae66fc 100644
--- a/tools/dhcp-test.c
+++ b/tools/dhcp-test.c
@@ -33,7 +33,6 @@
 #include <arpa/inet.h>
 #include <net/route.h>
 #include <net/ethernet.h>
-#include <linux/if_arp.h>
 
 #include <gdhcp/gdhcp.h>
 
diff --git a/tools/dnsproxy-test.c b/tools/dnsproxy-test.c
index 551cae9..371e2e2 100644
--- a/tools/dnsproxy-test.c
+++ b/tools/dnsproxy-test.c
@@ -24,6 +24,7 @@
 #endif
 
 #include <errno.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
diff --git a/tools/private-network-test.c b/tools/private-network-test.c
index 3dd115b..2828bb3 100644
--- a/tools/private-network-test.c
+++ b/tools/private-network-test.c
@@ -32,7 +32,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <signal.h>
-#include <sys/poll.h>
+#include <poll.h>
 #include <sys/signalfd.h>
 #include <unistd.h>
 
diff --git a/tools/tap-test.c b/tools/tap-test.c
index 57917f5..cb3ee62 100644
--- a/tools/tap-test.c
+++ b/tools/tap-test.c
@@ -28,7 +28,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <string.h>
-#include <sys/poll.h>
+#include <poll.h>
 #include <sys/ioctl.h>
 
 #include <netinet/in.h>
-- 
2.8.1