From 34a441d0a5de1d12e0710a66874ab3fe5112ec18 Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Wed, 18 Nov 2015 10:05:07 +0000
Subject: [PATCH 06/12] Use configure to test for feature instead of platform

Test for various functions instead of trying to keep track of what
platform and what version of the given platform has support for what.

This should make it easier to port to currently unknown platforms and
will solve the issue if a platform add support for a missing feature in
the future.

The features we test for are:
- getifaddrs
- getauxval
- issetugid
- __secure_getenv

This is needed for musl libc.

Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
---
 open-vm-tools/configure.ac               |  4 ++++
 open-vm-tools/lib/misc/idLinux.c         | 30 +++++++++++-------------
 open-vm-tools/lib/nicInfo/nicInfoPosix.c | 11 +++++----
 3 files changed, 24 insertions(+), 21 deletions(-)

diff --git a/open-vm-tools/configure.ac b/open-vm-tools/configure.ac
index 5dc0be2b..3b439e8d 100644
--- a/open-vm-tools/configure.ac
+++ b/open-vm-tools/configure.ac
@@ -897,6 +897,7 @@ AC_CHECK_FUNCS(
 
 AC_CHECK_FUNCS([ecvt])
 AC_CHECK_FUNCS([fcvt])
+AC_CHECK_FUNCS([getifaddrs getauxval issetugid __secure_getenv])
 
 AC_CHECK_FUNC([mkdtemp], [have_mkdtemp=yes])
 
@@ -1145,10 +1146,13 @@ fi
 ###
 
 AC_CHECK_HEADERS([crypt.h])
+AC_CHECK_HEADERS([ifaddrs.h])
 AC_CHECK_HEADERS([inttypes.h])
 AC_CHECK_HEADERS([stdint.h])
 AC_CHECK_HEADERS([stdlib.h])
 AC_CHECK_HEADERS([wchar.h])
+AC_CHECK_HEADERS([net/if.h])
+AC_CHECK_HEADERS([sys/auxv.h])
 AC_CHECK_HEADERS([sys/inttypes.h])
 AC_CHECK_HEADERS([sys/io.h])
 AC_CHECK_HEADERS([sys/param.h]) # Required to make the sys/user.h check work correctly on FreeBSD
diff --git a/open-vm-tools/lib/misc/idLinux.c b/open-vm-tools/lib/misc/idLinux.c
index b950cf84..1dcfb508 100644
--- a/open-vm-tools/lib/misc/idLinux.c
+++ b/open-vm-tools/lib/misc/idLinux.c
@@ -27,12 +27,9 @@
 #include <sys/syscall.h>
 #include <string.h>
 #include <unistd.h>
-#ifdef __linux__
-#if defined(__GLIBC__) && \
-           (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 16))
+#ifdef HAVE_SYS_AUXV_H
 #include <sys/auxv.h>
 #endif
-#endif
 #ifdef __APPLE__
 #include <sys/socket.h>
 #include <TargetConditionals.h>
@@ -997,31 +994,32 @@ Id_EndSuperUser(uid_t uid)  // IN:
 static Bool
 IdIsSetUGid(void)
 {
-#if defined(__ANDROID__)
-   /* Android does not have a secure_getenv, so be conservative. */
-   return TRUE;
-#else
    /*
     * We use __secure_getenv, which returns NULL if the binary is
-    * setuid or setgid. Alternatives include,
+    * setuid or setgid, when issetugid or getauxval(AT_SECURE) is not
+    * available. Alternatives include,
     *
-    *   a) getauxval(AT_SECURE); not available until glibc 2.16.
-    *   b) __libc_enable_secure; may not be exported.
+    *   a) issetugid(); not (yet?) available in glibc.
+    *   b) getauxval(AT_SECURE); not available until glibc 2.16.
+    *   c) __libc_enable_secure; may not be exported.
     *
-    * Use (a) when we are based on glibc 2.16, or newer.
+    * Use (b) when we are based on glibc 2.16, or newer.
     */
 
-#if defined(__GLIBC__) && \
-           (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 16))
+#if HAVE_ISSETUGID
+   return issetugid();
+#elif HAVE_GETAUXVAL
    return getauxval(AT_SECURE) != 0;
-#else
+#elif HAVE___SECURE_GETENV
    static const char envName[] = "VMW_SETUGID_TEST";
 
    if (setenv(envName, "1", TRUE) == -1) {
       return TRUE; /* Conservative */
    }
    return __secure_getenv(envName) == NULL;
-#endif
+#else
+   /* Android does not have a secure_getenv, so be conservative. */
+   return TRUE;
 #endif
 }
 #endif
diff --git a/open-vm-tools/lib/nicInfo/nicInfoPosix.c b/open-vm-tools/lib/nicInfo/nicInfoPosix.c
index a22981d5..ddc37e09 100644
--- a/open-vm-tools/lib/nicInfo/nicInfoPosix.c
+++ b/open-vm-tools/lib/nicInfo/nicInfoPosix.c
@@ -34,9 +34,13 @@
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <errno.h>
-#if defined(__FreeBSD__) || defined(__APPLE__)
+#if HAVE_SYS_SYSCTL_H
 # include <sys/sysctl.h>
+#endif
+#if HAVE_IFADDRS_H
 # include <ifaddrs.h>
+#endif
+#if HAVE_NET_IF_H
 # include <net/if.h>
 #endif
 #ifndef NO_DNET
@@ -456,10 +460,7 @@ GuestInfoGetNicInfo(unsigned int maxIPv4Routes,
  *
  ******************************************************************************
  */
-#if defined(__FreeBSD__) || \
-    defined(__APPLE__) || \
-    defined(USERWORLD) || \
-    (defined(__linux__) && defined(NO_DNET))
+#if defined(NO_DNET) && defined(HAVE_GETIFADDRS)
 
 char *
 GuestInfoGetPrimaryIP(void)
-- 
2.19.1