Check whether getdomainname(), innetgr(), setresuid() and setresgid()

are declared and add prototypes in sudo_compat.h as needed.

config.h.in

@@ -89,6 +89,10 @@
    */
 #undef HAVE_DECL_ERRNO
 
+/* Define to 1 if you have the declaration of `getdomainname', and to 0 if you
+   don't. */
+#undef HAVE_DECL_GETDOMAINNAME
+
 /* Define to 1 if you have the declaration of `HOST_NAME_MAX', and to 0 if you
    don't. */
 #undef HAVE_DECL_HOST_NAME_MAX
@@ -97,6 +101,10 @@
    don't. */
 #undef HAVE_DECL_H_ERRNO
 
+/* Define to 1 if you have the declaration of `innetgr', and to 0 if you
+   don't. */
+#undef HAVE_DECL_INNETGR
+
 /* Define to 1 if you have the declaration of `LLONG_MAX', and to 0 if you
    don't. */
 #undef HAVE_DECL_LLONG_MAX
@@ -125,6 +133,10 @@
    don't. */
 #undef HAVE_DECL_SETAUTHDB
 
+/* Define to 1 if you have the declaration of `setresuid', and to 0 if you
+   don't. */
+#undef HAVE_DECL_SETRESUID
+
 /* Define to 1 if you have the declaration of `SIZE_MAX', and to 0 if you
    don't. */
 #undef HAVE_DECL_SIZE_MAX
@@ -157,6 +169,10 @@
    don't. */
 #undef HAVE_DECL_USRINFO
 
+/* Define to 1 if you have the declaration of `_innetgr', and to 0 if you
+   don't. */
+#undef HAVE_DECL__INNETGR
+
 /* Define to 1 if you have the declaration of `_POSIX_HOST_NAME_MAX', and to 0
    if you don't. */
 #undef HAVE_DECL__POSIX_HOST_NAME_MAX

configure

@@ -18610,6 +18610,17 @@ if test "x$ac_cv_func_setresuid" = xyes; then :
 _ACEOF
 
 	SKIP_SETREUID=yes
+	ac_fn_c_check_decl "$LINENO" "setresuid" "ac_cv_have_decl_setresuid" "$ac_includes_default"
+if test "x$ac_cv_have_decl_setresuid" = xyes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_SETRESUID $ac_have_decl
+_ACEOF
+
 	for ac_func in getresuid
 do :
   ac_fn_c_check_func "$LINENO" "getresuid" "ac_cv_func_getresuid"
@@ -18677,15 +18688,67 @@ _ACEOF
 fi
 done
 
-for ac_func in innetgr _innetgr
+for ac_func in innetgr
 do :
-  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+  ac_fn_c_check_func "$LINENO" "innetgr" "ac_cv_func_innetgr"
-ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+if test "x$ac_cv_func_innetgr" = xyes; then :
-if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
   cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
+#define HAVE_INNETGR 1
 _ACEOF
- break
+
+    ac_fn_c_check_decl "$LINENO" "innetgr" "ac_cv_have_decl_innetgr" "
+$ac_includes_default
+#ifdef HAVE_NETGROUP_H
+# include <netgroup.h>
+#else
+# include <netdb.h>
+#endif /* HAVE_NETGROUP_H */
+
+"
+if test "x$ac_cv_have_decl_innetgr" = xyes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_INNETGR $ac_have_decl
+_ACEOF
+
+else
+
+    for ac_func in _innetgr
+do :
+  ac_fn_c_check_func "$LINENO" "_innetgr" "ac_cv_func__innetgr"
+if test "x$ac_cv_func__innetgr" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE__INNETGR 1
+_ACEOF
+
+	ac_fn_c_check_decl "$LINENO" "_innetgr" "ac_cv_have_decl__innetgr" "
+$ac_includes_default
+#ifdef HAVE_NETGROUP_H
+# include <netgroup.h>
+#else
+# include <netdb.h>
+#endif /* HAVE_NETGROUP_H */
+
+"
+if test "x$ac_cv_have_decl__innetgr" = xyes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL__INNETGR $ac_have_decl
+_ACEOF
+
+
+fi
+done
+
+
 fi
 done
 
@@ -18697,6 +18760,18 @@ if test "x$ac_cv_func_getdomainname" = xyes; then :
 #define HAVE_GETDOMAINNAME 1
 _ACEOF
 
+    ac_fn_c_check_decl "$LINENO" "getdomainname" "ac_cv_have_decl_getdomainname" "$ac_includes_default"
+if test "x$ac_cv_have_decl_getdomainname" = xyes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_GETDOMAINNAME $ac_have_decl
+_ACEOF
+
+
 else
 
     for ac_func in sysinfo

configure.ac

@@ -2451,6 +2451,7 @@ SUDO_FUNC_PUTENV_CONST
 if test -z "$SKIP_SETRESUID"; then
     AC_CHECK_FUNCS([setresuid], [
 	SKIP_SETREUID=yes
+	AC_CHECK_DECLS([setresuid])
 	AC_CHECK_FUNCS([getresuid])
     ])
 fi
@@ -2462,8 +2463,29 @@ if test X"$with_interfaces" != X"no"; then
     AC_CHECK_FUNCS([getifaddrs], [AC_CHECK_FUNCS([freeifaddrs])])
 fi
 AC_CHECK_FUNCS([lockf flock], [break])
-AC_CHECK_FUNCS([innetgr _innetgr], [break])
+AC_CHECK_FUNCS([innetgr], [
-AC_CHECK_FUNCS([getdomainname], [], [
+    AC_CHECK_DECLS([innetgr], [], [], [
+AC_INCLUDES_DEFAULT
+#ifdef HAVE_NETGROUP_H
+# include <netgroup.h>
+#else
+# include <netdb.h>
+#endif /* HAVE_NETGROUP_H */
+])], [
+    AC_CHECK_FUNCS([_innetgr], [
+	AC_CHECK_DECLS([_innetgr], [], [], [
+AC_INCLUDES_DEFAULT
+#ifdef HAVE_NETGROUP_H
+# include <netgroup.h>
+#else
+# include <netdb.h>
+#endif /* HAVE_NETGROUP_H */
+	])
+    ])
+])
+AC_CHECK_FUNCS([getdomainname], [
+    AC_CHECK_DECLS([getdomainname])
+], [
     AC_CHECK_FUNCS([sysinfo], [AC_CHECK_HEADERS([sys/systeminfo.h])])
 ])
 AC_CHECK_FUNCS([utimes], [

include/sudo_compat.h

@@ -339,14 +339,25 @@ extern int errno;
 #  endif
 #endif /* HAVE_SETEUID */
 
+/*
+ * Older HP-UX does not declare setresuid() or setresgid().
+ */
+#if defined(HAVE_DECL_SETRESUID) && !HAVE_DECL_SETRESUID
+int setresuid(uid_t ruid, uid_t euid, uid_t suid);
+int setresgid(gid_t rgid, gid_t egid, gid_t sgid);
+#endif
+
 /*
  * HP-UX does not declare innetgr() or getdomainname().
  * Solaris does not declare getdomainname().
  */
-#if defined(__hpux)
+#if defined(HAVE_DECL_INNETGR) && !HAVE_DECL_INNETGR
 int innetgr(const char *, const char *, const char *, const char *);
 #endif
-#if defined(__hpux) || defined(__sun)
+#if defined(HAVE_DECL__INNETGR) && !HAVE_DECL__INNETGR
+int _innetgr(const char *, const char *, const char *, const char *);
+#endif
+#if defined(HAVE_DECL_GETDOMAINNAME) && !HAVE_DECL_GETDOMAINNAME
 int getdomainname(char *, size_t);
 #endif