From: Todd C. Miller <Todd.Miller@sudo.ws>
Date: Mon, 5 Nov 2018 16:08:05 +0000 (-0700)
Subject: Add sudo_gai_fatal, sudo_gai_vfatal, sudo_gai_vwarn, sudo_gai_warn
X-Git-Tag: SUDO_1_8_26^2~7
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=cdd5bb32eb56b02dfc802a05ebad8051a644c360;p=sudo

Add sudo_gai_fatal, sudo_gai_vfatal, sudo_gai_vwarn, sudo_gai_warn
and gai_log_warning that use gai_strerror() instead of strerror().
---

diff --git a/NEWS b/NEWS
index 0843873da..f27296127 100644
--- a/NEWS
+++ b/NEWS
@@ -49,6 +49,10 @@ What's new in Sudo 1.8.26
  * The sudoers LDAP back-end now supports negated sudoRunAsUser and
    sudoRunAsGroup entries.
 
+ * Sudo now provides a proper error message when the "fqdn" sudoers
+   option is set and it is unable to resolve the local host name.
+   Bug #859.
+
 What's new in Sudo 1.8.25p1
 
  * Fixed a bug introduced in sudo 1.8.25 that caused a crash on
diff --git a/configure b/configure
index f5e6a4682..794516296 100755
--- a/configure
+++ b/configure
@@ -21629,7 +21629,7 @@ LIBS="$OLIBS"
 # If it was added to LIBOBJS we need to export the symbols.
 #
 OLIBS="$LIBS"
-LIBS="${LIBS} ${NET_LIBS}"
+GETADDRINFO_LIBS=
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for getaddrinfo" >&5
 $as_echo_n "checking for getaddrinfo... " >&6; }
 if ${ax_cv_func_getaddrinfo+:} false; then :
@@ -21810,11 +21810,25 @@ fi
 	;;
     *)
 	for lib in $LIBS; do
-	    case "$NET_LIBS" in
+	    case "$OLIBS" in
 		*"$lib"*) ;;
-		*) NET_LIBS="${NET_LIBS} $lib";;
+		*) GETADDRINFO_LIBS="${GETADDRINFO_LIBS}${GETADDRINFO_LIBS+ }$lib";;
 	    esac
 	done
+	if test -n "${GETADDRINFO_LIBS}"; then
+	    # We need libsudo_util to pull in dependent libraries for
+	    # gai_strerror()
+	    LT_DEP_LIBS="${LT_DEP_LIBS}${LT_DEP_LIBS+ }${GETADDRINFO_LIBS}"
+	    LIBS="${LIBS}${LIBS+ }${GETADDRINFO_LIBS}"
+
+	    # Add to NET_LIBS if necessary
+	    for lib in $GETADDRINFO_LIBS; do
+		case "$NET_LIBS" in
+		    *"$lib"*)   ;;
+		    *)		NET_LIBS="${NET_LIBS}${NET_LIBS+ }$lib";;
+		esac
+	    done
+	fi
 	;;
 esac
 LIBS="$OLIBS"
diff --git a/configure.ac b/configure.ac
index ff9efb446..86e0627c8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3023,7 +3023,7 @@ LIBS="$OLIBS"
 # If it was added to LIBOBJS we need to export the symbols.
 #
 OLIBS="$LIBS"
-LIBS="${LIBS} ${NET_LIBS}"
+GETADDRINFO_LIBS=
 AX_FUNC_GETADDRINFO
 case " $LIBOBJS " in
     *" getaddrinfo.$ac_objext "* )
@@ -3053,11 +3053,25 @@ case " $LIBOBJS " in
 	;;
     *)
 	for lib in $LIBS; do
-	    case "$NET_LIBS" in
+	    case "$OLIBS" in
 		*"$lib"*) ;;
-		*) NET_LIBS="${NET_LIBS} $lib";;
+		*) GETADDRINFO_LIBS="${GETADDRINFO_LIBS}${GETADDRINFO_LIBS+ }$lib";;
 	    esac
 	done
+	if test -n "${GETADDRINFO_LIBS}"; then
+	    # We need libsudo_util to pull in dependent libraries for
+	    # gai_strerror()
+	    LT_DEP_LIBS="${LT_DEP_LIBS}${LT_DEP_LIBS+ }${GETADDRINFO_LIBS}"
+	    LIBS="${LIBS}${LIBS+ }${GETADDRINFO_LIBS}"
+
+	    # Add to NET_LIBS if necessary
+	    for lib in $GETADDRINFO_LIBS; do
+		case "$NET_LIBS" in
+		    *"$lib"*)   ;;
+		    *)		NET_LIBS="${NET_LIBS}${NET_LIBS+ }$lib";;
+		esac
+	    done
+	fi
 	;;
 esac
 LIBS="$OLIBS"
diff --git a/include/sudo_fatal.h b/include/sudo_fatal.h
index 576644adc..ea92b3b6e 100644
--- a/include/sudo_fatal.h
+++ b/include/sudo_fatal.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2004, 2010-2014 Todd C. Miller <Todd.Miller@sudo.ws>
+ * Copyright (c) 2004, 2010-2015, 2017-2018 Todd C. Miller <Todd.Miller@sudo.ws>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -31,12 +31,16 @@
 #if (defined(SUDO_ERROR_WRAP) && SUDO_ERROR_WRAP == 0) || defined(NO_VARIADIC_MACROS)
 # define sudo_fatal sudo_fatal_nodebug_v1
 # define sudo_fatalx sudo_fatalx_nodebug_v1
+# define sudo_gai_fatal sudo_gai_fatal_nodebug_v1
 # define sudo_warn sudo_warn_nodebug_v1
 # define sudo_warnx sudo_warnx_nodebug_v1
+# define sudo_gai_warn sudo_gai_warn_nodebug_v1
 # define sudo_vfatal(fmt, ap) sudo_vfatal_nodebug_v1((fmt), (ap))
 # define sudo_vfatalx(fmt, ap) sudo_vfatalx_nodebug_v1((fmt), (ap))
+# define sudo_gai_vfatal(en, fmt, ap) sudo_vfatal_nodebug_v1((en), (fmt), (ap))
 # define sudo_vwarn(fmt, ap) sudo_vwarn_nodebug_v1((fmt), (ap))
 # define sudo_vwarnx(fmt, ap) sudo_vwarnx_nodebug_v1((fmt), (ap))
+# define sudo_gai_vwarn(en, fmt, ap) sudo_vwarn_nodebug_v1((en), (fmt), (ap))
 #else /* SUDO_ERROR_WRAP */
 # if defined(__GNUC__) && __GNUC__ == 2
 #  define sudo_fatal(fmt...) do {					       \
@@ -48,7 +52,12 @@
 #  define sudo_fatalx(fmt...) do {					       \
     sudo_debug_printf2(__func__, __FILE__, __LINE__,			       \
 	SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|sudo_debug_subsys, fmt);	       \
-    sudo_fatalx_nodebug_v1(fmt);						       \
+    sudo_fatalx_nodebug_v1(fmt);					       \
+} while (0)
+#  define sudo_gai_fatal(en, fmt...) do {				       \
+    sudo_debug_printf2(__func__, __FILE__, __LINE__,			       \
+	SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|sudo_debug_subsys, fmt);	       \
+    sudo_gai_fatal_nodebug_v1((en), fmt);				       \
 } while (0)
 #  define sudo_warn(fmt...) do {					       \
     sudo_debug_printf2(__func__, __FILE__, __LINE__,			       \
@@ -61,6 +70,11 @@
 	SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|sudo_debug_subsys, fmt);	       \
     sudo_warnx_nodebug_v1(fmt);						       \
 } while (0)
+#  define sudo_gai_warn(en, fmt...) do {				       \
+    sudo_debug_printf2(__func__, __FILE__, __LINE__,			       \
+	SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|sudo_debug_subsys, fmt);	       \
+    sudo_gai_warn_nodebug_v1((en), fmt);				       \
+} while (0)
 # else
 #  define sudo_fatal(...) do {						       \
     sudo_debug_printf2(__func__, __FILE__, __LINE__,			       \
@@ -71,7 +85,12 @@
 #  define sudo_fatalx(...) do {						       \
     sudo_debug_printf2(__func__, __FILE__, __LINE__,			       \
 	SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|sudo_debug_subsys, __VA_ARGS__);    \
-    sudo_fatalx_nodebug_v1(__VA_ARGS__);					       \
+    sudo_fatalx_nodebug_v1(__VA_ARGS__);				       \
+} while (0)
+#  define sudo_gai_fatal(en, ...) do {					       \
+    sudo_debug_printf2(__func__, __FILE__, __LINE__,			       \
+	SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|sudo_debug_subsys, __VA_ARGS__);    \
+    sudo_gai_fatal_nodebug_v1((en), __VA_ARGS__);			       \
 } while (0)
 #  define sudo_warn(...) do {						       \
     sudo_debug_printf2(__func__, __FILE__, __LINE__,			       \
@@ -84,6 +103,11 @@
 	SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|sudo_debug_subsys, __VA_ARGS__);     \
     sudo_warnx_nodebug_v1(__VA_ARGS__);					       \
 } while (0)
+#  define sudo_gai_warn(en, ...) do {					       \
+    sudo_debug_printf2(__func__, __FILE__, __LINE__,			       \
+	SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|sudo_debug_subsys, __VA_ARGS__);     \
+    sudo_gai_warn_nodebug_v1((en), __VA_ARGS__);			       \
+} while (0)
 # endif /* __GNUC__ == 2 */
 # define sudo_vfatal(fmt, ap) do {					       \
     va_list ap2;							       \
@@ -98,7 +122,14 @@
     va_copy(ap2, (ap));							       \
     sudo_debug_vprintf2(__func__, __FILE__, __LINE__,			       \
 	SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|sudo_debug_subsys, (fmt), ap2);     \
-    sudo_vfatalx_nodebug_v1((fmt), (ap));					       \
+    sudo_vfatalx_nodebug_v1((fmt), (ap));				       \
+} while (0)
+# define sudo_gai_vfatal(en, fmt, ap) do {				       \
+    va_list ap2;							       \
+    va_copy(ap2, (ap));							       \
+    sudo_debug_vprintf2(__func__, __FILE__, __LINE__,			       \
+	SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|sudo_debug_subsys, (fmt), ap2);     \
+    sudo_gai_vfatal_nodebug_v1((en), (fmt), (ap));			       \
 } while (0)
 # define sudo_vwarn(fmt, ap) do {					       \
     va_list ap2;							       \
@@ -113,7 +144,14 @@
     va_copy(ap2, (ap));							       \
     sudo_debug_vprintf2(__func__, __FILE__, __LINE__,			       \
 	SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|sudo_debug_subsys, (fmt), ap2);      \
-    sudo_vwarnx_nodebug_v1((fmt), (ap));					       \
+    sudo_vwarnx_nodebug_v1((fmt), (ap));				       \
+} while (0)
+# define sudo_gai_vwarn(en, fmt, ap) do {				       \
+    va_list ap2;							       \
+    va_copy(ap2, (ap));							       \
+    sudo_debug_vprintf2(__func__, __FILE__, __LINE__,			       \
+	SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|sudo_debug_subsys, (fmt), ap2);      \
+    sudo_gai_vwarn_nodebug_v1((en), (fmt), (ap));			       \
 } while (0)
 #endif /* SUDO_ERROR_WRAP */
 
@@ -129,12 +167,16 @@ __dso_public char *sudo_warn_gettext_v1(const char *domainname, const char *msgi
 __dso_public void sudo_warn_set_locale_func_v1(bool (*func)(bool, int *));
 __dso_public void sudo_fatal_nodebug_v1(const char *fmt, ...) __printf0like(1, 2) __attribute__((__noreturn__));
 __dso_public void sudo_fatalx_nodebug_v1(const char *fmt, ...) __printflike(1, 2) __attribute__((__noreturn__));
+__dso_public void sudo_gai_fatal_nodebug_v1(int errnum, const char *fmt, ...) __printflike(2, 3) __attribute__((__noreturn__));
 __dso_public void sudo_vfatal_nodebug_v1(const char *fmt, va_list ap) __printf0like(1, 0) __attribute__((__noreturn__));
 __dso_public void sudo_vfatalx_nodebug_v1(const char *fmt, va_list ap) __printflike(1, 0) __attribute__((__noreturn__));
+__dso_public void sudo_gai_vfatal_nodebug_v1(int errnum, const char *fmt, va_list ap) __printflike(2, 0) __attribute__((__noreturn__));
 __dso_public void sudo_warn_nodebug_v1(const char *fmt, ...) __printf0like(1, 2);
 __dso_public void sudo_warnx_nodebug_v1(const char *fmt, ...) __printflike(1, 2);
+__dso_public void sudo_gai_warn_nodebug_v1(int errnum, const char *fmt, ...) __printflike(2, 3);
 __dso_public void sudo_vwarn_nodebug_v1(const char *fmt, va_list ap) __printf0like(1, 0);
 __dso_public void sudo_vwarnx_nodebug_v1(const char *fmt, va_list ap) __printflike(1, 0);
+__dso_public void sudo_gai_vwarn_nodebug_v1(int errnum, const char *fmt, va_list ap) __printflike(2, 0);
 __dso_public void sudo_warn_set_conversation_v1(int (*conv)(int num_msgs, const struct sudo_conv_message *msgs, struct sudo_conv_reply *replies, struct sudo_conv_callback *callback));
 
 #define sudo_fatal_callback_deregister(_a) sudo_fatal_callback_deregister_v1((_a))
@@ -142,12 +184,16 @@ __dso_public void sudo_warn_set_conversation_v1(int (*conv)(int num_msgs, const
 #define sudo_warn_set_locale_func(_a) sudo_warn_set_locale_func_v1((_a))
 #define sudo_fatal_nodebug sudo_fatal_nodebug_v1
 #define sudo_fatalx_nodebug sudo_fatalx_nodebug_v1
+#define sudo_gai_fatal_nodebug sudo_gai_fatal_nodebug_v1
 #define sudo_vfatal_nodebug(_a, _b) sudo_vfatal_nodebug_v1((_a), (_b))
 #define sudo_vfatalx_nodebug(_a, _b) sudo_vfatalx_nodebug_v1((_a), (_b))
+#define sudo_gai_vfatal_nodebug(_a, _b, _c) sudo_gai_vfatal_nodebug_v1((_a), (_b), (_c))
 #define sudo_warn_nodebug sudo_warn_nodebug_v1
 #define sudo_warnx_nodebug sudo_warnx_nodebug_v1
+#define sudo_gai_warn_nodebug sudo_gai_warn_nodebug_v1
 #define sudo_vwarn_nodebug(_a, _b) sudo_vwarn_nodebug_v1((_a), (_b))
 #define sudo_vwarnx_nodebug(_a, _b) sudo_vwarnx_nodebug_v1((_a), (_b))
+#define sudo_gai_vwarn_nodebug(_a, _b, _c) sudo_gai_vwarn_nodebug_v1((_a), (_b), (_c))
 #define sudo_warn_set_conversation(_a) sudo_warn_set_conversation_v1(_a)
 
 #ifdef DEFAULT_TEXT_DOMAIN
diff --git a/lib/util/Makefile.in b/lib/util/Makefile.in
index 6f5ab84b2..cadfcf250 100644
--- a/lib/util/Makefile.in
+++ b/lib/util/Makefile.in
@@ -512,12 +512,14 @@ event_select.i: $(srcdir)/event_select.c $(incdir)/compat/stdbool.h \
 	$(CC) -E -o $@ $(CPPFLAGS) $<
 event_select.plog: event_select.i
 	rm -f $@; pvs-studio --cfg $(PVS_CFG) --sourcetree-root $(top_srcdir) --skip-cl-exe yes --source-file $(srcdir)/event_select.c --i-file $< --output-file $@
-fatal.lo: $(srcdir)/fatal.c $(incdir)/compat/stdbool.h $(incdir)/sudo_compat.h \
+fatal.lo: $(srcdir)/fatal.c $(incdir)/compat/getaddrinfo.h \
+          $(incdir)/compat/stdbool.h $(incdir)/sudo_compat.h \
           $(incdir)/sudo_fatal.h $(incdir)/sudo_gettext.h \
           $(incdir)/sudo_plugin.h $(incdir)/sudo_queue.h $(incdir)/sudo_util.h \
           $(top_builddir)/config.h
 	$(LIBTOOL) $(LTFLAGS) --mode=compile $(CC) -c -o $@ $(CPPFLAGS) $(CFLAGS) $(ASAN_CFLAGS) $(PIE_CFLAGS) $(SSP_CFLAGS) $(srcdir)/fatal.c
-fatal.i: $(srcdir)/fatal.c $(incdir)/compat/stdbool.h $(incdir)/sudo_compat.h \
+fatal.i: $(srcdir)/fatal.c $(incdir)/compat/getaddrinfo.h \
+          $(incdir)/compat/stdbool.h $(incdir)/sudo_compat.h \
           $(incdir)/sudo_fatal.h $(incdir)/sudo_gettext.h \
           $(incdir)/sudo_plugin.h $(incdir)/sudo_queue.h $(incdir)/sudo_util.h \
           $(top_builddir)/config.h
diff --git a/lib/util/fatal.c b/lib/util/fatal.c
index 77b1a85b3..645b59082 100644
--- a/lib/util/fatal.c
+++ b/lib/util/fatal.c
@@ -1,5 +1,6 @@
 /*
- * Copyright (c) 2004-2005, 2010-2014 Todd C. Miller <Todd.Miller@sudo.ws>
+ * Copyright (c) 2004-2005, 2010-2015, 2017-2018
+ *	Todd C. Miller <Todd.Miller@sudo.ws>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -24,6 +25,7 @@
 #include <sys/types.h>
 
 #include <errno.h>
+#include <netdb.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -42,6 +44,10 @@
 #include "sudo_util.h"
 #include "sudo_plugin.h"
 
+#ifndef HAVE_GETADDRINFO
+# include "compat/getaddrinfo.h"
+#endif
+
 struct sudo_fatal_callback {
     SLIST_ENTRY(sudo_fatal_callback) entries;
     void (*func)(void);
@@ -53,7 +59,7 @@ static sudo_conv_t sudo_warn_conversation;
 static bool (*sudo_warn_setlocale)(bool, int *);
 static bool (*sudo_warn_setlocale_prev)(bool, int *);
 
-static void warning(int errnum, const char *fmt, va_list ap);
+static void warning(const char *errstr, const char *fmt, va_list ap);
 
 static void
 do_cleanup(void)
@@ -74,7 +80,7 @@ sudo_fatal_nodebug_v1(const char *fmt, ...)
     va_list ap;
 
     va_start(ap, fmt);
-    warning(errno, fmt, ap);
+    warning(strerror(errno), fmt, ap);
     va_end(ap);
     do_cleanup();
     exit(EXIT_FAILURE);
@@ -86,7 +92,7 @@ sudo_fatalx_nodebug_v1(const char *fmt, ...)
     va_list ap;
 
     va_start(ap, fmt);
-    warning(0, fmt, ap);
+    warning(NULL, fmt, ap);
     va_end(ap);
     do_cleanup();
     exit(EXIT_FAILURE);
@@ -95,7 +101,7 @@ sudo_fatalx_nodebug_v1(const char *fmt, ...)
 void
 sudo_vfatal_nodebug_v1(const char *fmt, va_list ap)
 {
-    warning(errno, fmt, ap);
+    warning(strerror(errno), fmt, ap);
     do_cleanup();
     exit(EXIT_FAILURE);
 }
@@ -103,7 +109,7 @@ sudo_vfatal_nodebug_v1(const char *fmt, va_list ap)
 void
 sudo_vfatalx_nodebug_v1(const char *fmt, va_list ap)
 {
-    warning(0, fmt, ap);
+    warning(NULL, fmt, ap);
     do_cleanup();
     exit(EXIT_FAILURE);
 }
@@ -114,7 +120,7 @@ sudo_warn_nodebug_v1(const char *fmt, ...)
     va_list ap;
 
     va_start(ap, fmt);
-    warning(errno, fmt, ap);
+    warning(strerror(errno), fmt, ap);
     va_end(ap);
 }
 
@@ -123,24 +129,60 @@ sudo_warnx_nodebug_v1(const char *fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);
-    warning(0, fmt, ap);
+    warning(NULL, fmt, ap);
     va_end(ap);
 }
 
 void
 sudo_vwarn_nodebug_v1(const char *fmt, va_list ap)
 {
-    warning(errno, fmt, ap);
+    warning(strerror(errno), fmt, ap);
 }
 
 void
 sudo_vwarnx_nodebug_v1(const char *fmt, va_list ap)
 {
-    warning(0, fmt, ap);
+    warning(NULL, fmt, ap);
+}
+
+void
+sudo_gai_fatal_nodebug_v1(int errnum, const char *fmt, ...)
+{
+    va_list ap;
+
+    va_start(ap, fmt);
+    warning(gai_strerror(errnum), fmt, ap);
+    va_end(ap);
+    do_cleanup();
+    exit(EXIT_FAILURE);
+}
+
+void
+sudo_gai_vfatal_nodebug_v1(int errnum, const char *fmt, va_list ap)
+{
+    warning(gai_strerror(errnum), fmt, ap);
+    do_cleanup();
+    exit(EXIT_FAILURE);
+}
+
+void
+sudo_gai_warn_nodebug_v1(int errnum, const char *fmt, ...)
+{
+    va_list ap;
+
+    va_start(ap, fmt);
+    warning(gai_strerror(errnum), fmt, ap);
+    va_end(ap);
+}
+
+void
+sudo_gai_vwarn_nodebug_v1(int errnum, const char *fmt, va_list ap)
+{
+    warning(gai_strerror(errnum), fmt, ap);
 }
 
 static void
-warning(int errnum, const char *fmt, va_list ap)
+warning(const char *errstr, const char *fmt, va_list ap)
 {
     int cookie;
 
@@ -176,11 +218,11 @@ warning(int errnum, const char *fmt, va_list ap)
 		msgs[nmsgs].msg_type = SUDO_CONV_ERROR_MSG;
 		msgs[nmsgs++].msg = buf;
         }
-        if (errnum) {
+        if (errstr != NULL) {
 	    msgs[nmsgs].msg_type = SUDO_CONV_ERROR_MSG;
 	    msgs[nmsgs++].msg = ": ";
 	    msgs[nmsgs].msg_type = SUDO_CONV_ERROR_MSG;
-	    msgs[nmsgs++].msg = strerror(errnum);
+	    msgs[nmsgs++].msg = errstr;
         }
 	msgs[nmsgs].msg_type = SUDO_CONV_ERROR_MSG;
 	msgs[nmsgs++].msg = "\n";
@@ -194,9 +236,9 @@ warning(int errnum, const char *fmt, va_list ap)
                 fputs(": ", stderr);
                 vfprintf(stderr, fmt, ap);
         }
-        if (errnum) {
+        if (errstr != NULL) {
             fputs(": ", stderr);
-            fputs(strerror(errnum), stderr);
+            fputs(errstr, stderr);
         }
         putc('\n', stderr);
     }
diff --git a/lib/util/util.exp.in b/lib/util/util.exp.in
index e8fb862ee..510c34cec 100644
--- a/lib/util/util.exp.in
+++ b/lib/util/util.exp.in
@@ -70,6 +70,10 @@ sudo_fatal_callback_deregister_v1
 sudo_fatal_callback_register_v1
 sudo_fatal_nodebug_v1
 sudo_fatalx_nodebug_v1
+sudo_gai_fatal_nodebug_v1
+sudo_gai_vfatal_nodebug_v1
+sudo_gai_vwarn_nodebug_v1
+sudo_gai_warn_nodebug_v1
 sudo_get_ttysize_v1
 sudo_getgrouplist2_v1
 sudo_gethostname_v1
diff --git a/plugins/sudoers/Makefile.in b/plugins/sudoers/Makefile.in
index 82d6c7ee2..e3f6bb5f6 100644
--- a/plugins/sudoers/Makefile.in
+++ b/plugins/sudoers/Makefile.in
@@ -1714,24 +1714,24 @@ locale.i: $(srcdir)/locale.c $(devdir)/def_data.h $(incdir)/compat/stdbool.h \
 locale.plog: locale.i
 	rm -f $@; pvs-studio --cfg $(PVS_CFG) --sourcetree-root $(top_srcdir) --skip-cl-exe yes --source-file $(srcdir)/locale.c --i-file $< --output-file $@
 logging.lo: $(srcdir)/logging.c $(devdir)/def_data.h \
-            $(incdir)/compat/stdbool.h $(incdir)/sudo_compat.h \
-            $(incdir)/sudo_conf.h $(incdir)/sudo_debug.h \
-            $(incdir)/sudo_fatal.h $(incdir)/sudo_gettext.h \
-            $(incdir)/sudo_plugin.h $(incdir)/sudo_queue.h \
-            $(incdir)/sudo_util.h $(srcdir)/defaults.h $(srcdir)/logging.h \
-            $(srcdir)/parse.h $(srcdir)/sudo_nss.h $(srcdir)/sudoers.h \
-            $(srcdir)/sudoers_debug.h $(top_builddir)/config.h \
-            $(top_builddir)/pathnames.h
+            $(incdir)/compat/getaddrinfo.h $(incdir)/compat/stdbool.h \
+            $(incdir)/sudo_compat.h $(incdir)/sudo_conf.h \
+            $(incdir)/sudo_debug.h $(incdir)/sudo_fatal.h \
+            $(incdir)/sudo_gettext.h $(incdir)/sudo_plugin.h \
+            $(incdir)/sudo_queue.h $(incdir)/sudo_util.h $(srcdir)/defaults.h \
+            $(srcdir)/logging.h $(srcdir)/parse.h $(srcdir)/sudo_nss.h \
+            $(srcdir)/sudoers.h $(srcdir)/sudoers_debug.h \
+            $(top_builddir)/config.h $(top_builddir)/pathnames.h
 	$(LIBTOOL) $(LTFLAGS) --mode=compile $(CC) -c $(CPPFLAGS) $(CFLAGS) $(ASAN_CFLAGS) $(PIE_CFLAGS) $(SSP_CFLAGS) $(srcdir)/logging.c
 logging.i: $(srcdir)/logging.c $(devdir)/def_data.h \
-            $(incdir)/compat/stdbool.h $(incdir)/sudo_compat.h \
-            $(incdir)/sudo_conf.h $(incdir)/sudo_debug.h \
-            $(incdir)/sudo_fatal.h $(incdir)/sudo_gettext.h \
-            $(incdir)/sudo_plugin.h $(incdir)/sudo_queue.h \
-            $(incdir)/sudo_util.h $(srcdir)/defaults.h $(srcdir)/logging.h \
-            $(srcdir)/parse.h $(srcdir)/sudo_nss.h $(srcdir)/sudoers.h \
-            $(srcdir)/sudoers_debug.h $(top_builddir)/config.h \
-            $(top_builddir)/pathnames.h
+            $(incdir)/compat/getaddrinfo.h $(incdir)/compat/stdbool.h \
+            $(incdir)/sudo_compat.h $(incdir)/sudo_conf.h \
+            $(incdir)/sudo_debug.h $(incdir)/sudo_fatal.h \
+            $(incdir)/sudo_gettext.h $(incdir)/sudo_plugin.h \
+            $(incdir)/sudo_queue.h $(incdir)/sudo_util.h $(srcdir)/defaults.h \
+            $(srcdir)/logging.h $(srcdir)/parse.h $(srcdir)/sudo_nss.h \
+            $(srcdir)/sudoers.h $(srcdir)/sudoers_debug.h \
+            $(top_builddir)/config.h $(top_builddir)/pathnames.h
 	$(CC) -E -o $@ $(CPPFLAGS) $<
 logging.plog: logging.i
 	rm -f $@; pvs-studio --cfg $(PVS_CFG) --sourcetree-root $(top_srcdir) --skip-cl-exe yes --source-file $(srcdir)/logging.c --i-file $< --output-file $@
diff --git a/plugins/sudoers/logging.c b/plugins/sudoers/logging.c
index 767b284a9..95626096a 100644
--- a/plugins/sudoers/logging.c
+++ b/plugins/sudoers/logging.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1994-1996, 1998-2017 Todd C. Miller <Todd.Miller@sudo.ws>
+ * Copyright (c) 1994-1996, 1998-2018 Todd C. Miller <Todd.Miller@sudo.ws>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -45,6 +45,7 @@
 #ifdef HAVE_NL_LANGINFO
 # include <langinfo.h>
 #endif /* HAVE_NL_LANGINFO */
+#include <netdb.h>
 #include <pwd.h>
 #include <grp.h>
 #include <signal.h>
@@ -56,6 +57,10 @@
 
 #include "sudoers.h"
 
+#ifndef HAVE_GETADDRINFO
+# include "compat/getaddrinfo.h"
+#endif
+
 /* Special message for log_warning() so we know to use ngettext() */
 #define INCORRECT_PASSWORD_ATTEMPT	((char *)0x01)
 
@@ -64,7 +69,7 @@ static bool do_logfile(const char *);
 static bool send_mail(const char *fmt, ...);
 static bool should_mail(int);
 static void mysyslog(int, const char *, ...);
-static char *new_logline(const char *, int);
+static char *new_logline(const char *, const char *);
 
 #define MAXSYSLOGTRIES	16	/* num of retries for broken syslogs */
 
@@ -252,7 +257,7 @@ log_denial(int status, bool inform_user)
     else
 	message = _("command not allowed");
 
-    logline = new_logline(message, 0);
+    logline = new_logline(message, NULL);
     if (logline == NULL)
 	debug_return_bool(false);
 
@@ -396,7 +401,7 @@ log_allowed(int status)
     /* Log and mail messages should be in the sudoers locale. */
     sudoers_setlocale(SUDOERS_LOCALE_SUDOERS, &oldlocale);
 
-    if ((logline = new_logline(NULL, 0)) == NULL)
+    if ((logline = new_logline(NULL, NULL)) == NULL)
 	debug_return_bool(false);
 
     /* Become root if we are not already. */
@@ -486,14 +491,15 @@ done:
  * Perform logging for log_warning()/log_warningx().
  */
 static bool
-vlog_warning(int flags, const char *fmt, va_list ap)
+vlog_warning(int flags, int errnum, const char *fmt, va_list ap)
 {
-    int oldlocale, serrno = errno;
+    int oldlocale;
+    const char *errstr = NULL;
     char *logline, *message;
     bool uid_changed, ret = true;
     va_list ap2;
     int len;
-    debug_decl(vlog_error, SUDOERS_DEBUG_LOGGING)
+    debug_decl(vlog_warning, SUDOERS_DEBUG_LOGGING)
 
     /* Need extra copy of ap for sudo_vwarn()/sudo_vwarnx() below. */
     va_copy(ap2, ap);
@@ -513,10 +519,15 @@ vlog_warning(int flags, const char *fmt, va_list ap)
 	goto done;
     }
 
+    if (ISSET(flags, SLOG_USE_ERRNO))
+	errstr = strerror(errnum);
+    else if (ISSET(flags, SLOG_GAI_ERRNO))
+	errstr = gai_strerror(errnum);
+
     /* Log to debug file. */
-    if (SLOG_USE_ERRNO) {
+    if (errstr != NULL) {
 	sudo_debug_printf2(NULL, NULL, 0,
-	    SUDO_DEBUG_WARN|SUDO_DEBUG_ERRNO|sudo_debug_subsys, "%s", message);
+	    SUDO_DEBUG_WARN|sudo_debug_subsys, "%s: %s", message, errstr);
     } else {
 	sudo_debug_printf2(NULL, NULL, 0,
 	    SUDO_DEBUG_WARN|sudo_debug_subsys, "%s", message);
@@ -525,7 +536,7 @@ vlog_warning(int flags, const char *fmt, va_list ap)
     if (ISSET(flags, SLOG_RAW_MSG)) {
 	logline = message;
     } else {
-	logline = new_logline(message, ISSET(flags, SLOG_USE_ERRNO) ? serrno : 0);
+	logline = new_logline(message, errstr);
         free(message);
 	if (logline == NULL) {
 	    ret = false;
@@ -577,10 +588,12 @@ vlog_warning(int flags, const char *fmt, va_list ap)
 	    sudo_warnx_nodebug("%s", message);
 	    free(message);
 	} else {
-	    errno = serrno;
-	    if (ISSET(flags, SLOG_USE_ERRNO))
+	    if (ISSET(flags, SLOG_USE_ERRNO)) {
+		errno = errnum;
 		sudo_vwarn_nodebug(_(fmt), ap2);
-	    else
+	    } else if (ISSET(flags, SLOG_GAI_ERRNO)) {
+		sudo_gai_vwarn_nodebug(errnum, _(fmt), ap2);
+	    } else
 		sudo_vwarnx_nodebug(_(fmt), ap2);
 	}
     }
@@ -597,11 +610,11 @@ log_warning(int flags, const char *fmt, ...)
 {
     va_list ap;
     bool ret;
-    debug_decl(log_error, SUDOERS_DEBUG_LOGGING)
+    debug_decl(log_warning, SUDOERS_DEBUG_LOGGING)
 
     /* Log the error. */
     va_start(ap, fmt);
-    ret = vlog_warning(flags|SLOG_USE_ERRNO, fmt, ap);
+    ret = vlog_warning(flags|SLOG_USE_ERRNO, errno, fmt, ap);
     va_end(ap);
 
     debug_return_bool(ret);
@@ -612,16 +625,32 @@ log_warningx(int flags, const char *fmt, ...)
 {
     va_list ap;
     bool ret;
-    debug_decl(log_error, SUDOERS_DEBUG_LOGGING)
+    debug_decl(log_warningx, SUDOERS_DEBUG_LOGGING)
+
+    /* Log the error. */
+    va_start(ap, fmt);
+    ret = vlog_warning(flags, 0, fmt, ap);
+    va_end(ap);
+
+    debug_return_bool(ret);
+}
+
+bool
+gai_log_warning(int flags, int errnum, const char *fmt, ...)
+{
+    va_list ap;
+    bool ret;
+    debug_decl(gai_log_warning, SUDOERS_DEBUG_LOGGING)
 
     /* Log the error. */
     va_start(ap, fmt);
-    ret = vlog_warning(flags, fmt, ap);
+    ret = vlog_warning(flags|SLOG_GAI_ERRNO, errnum, fmt, ap);
     va_end(ap);
 
     debug_return_bool(ret);
 }
 
+
 #define MAX_MAILFLAGS	63
 
 /*
@@ -868,9 +897,9 @@ should_mail(int status)
  * Allocate and fill in a new logline.
  */
 static char *
-new_logline(const char *message, int serrno)
+new_logline(const char *message, const char *errstr)
 {
-    char *line = NULL, *errstr = NULL, *evstr = NULL;
+    char *line = NULL, *evstr = NULL;
 #ifndef SUDOERS_NO_SEQ
     char sessid[7];
 #endif
@@ -901,10 +930,8 @@ new_logline(const char *message, int serrno)
      */
     if (message != NULL)
 	len += strlen(message) + 3;
-    if (serrno) {
-	errstr = strerror(serrno);
+    if (errstr != NULL)
 	len += strlen(errstr) + 3;
-    }
     len += sizeof(LL_TTY_STR) + 2 + strlen(user_tty);
     len += sizeof(LL_CWD_STR) + 2 + strlen(user_cwd);
     if (runas_pw != NULL)
@@ -951,7 +978,7 @@ new_logline(const char *message, int serrno)
 	    strlcat(line, errstr ? " : " : " ; ", len) >= len)
 	    goto toobig;
     }
-    if (serrno) {
+    if (errstr != NULL) {
 	if (strlcat(line, errstr, len) >= len ||
 	    strlcat(line, " ; ", len) >= len)
 	    goto toobig;
diff --git a/plugins/sudoers/logging.h b/plugins/sudoers/logging.h
index 08202b333..c7e99aeed 100644
--- a/plugins/sudoers/logging.h
+++ b/plugins/sudoers/logging.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999-2005, 2009-2017
+ * Copyright (c) 1999-2005, 2009-2018
  *	Todd C. Miller <Todd.Miller@sudo.ws>
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -37,10 +37,11 @@
 
 /* Flags for log_warning()/log_warningx() */
 #define SLOG_USE_ERRNO		0x01	/* internal use only */
-#define SLOG_RAW_MSG		0x02	/* do not format msg before logging */
-#define SLOG_SEND_MAIL		0x04	/* log via mail */
-#define SLOG_NO_STDERR		0x08	/* do not log via stderr */
-#define SLOG_NO_LOG		0x10	/* do not log via file or syslog */
+#define SLOG_GAI_ERRNO		0x02	/* internal use only */
+#define SLOG_RAW_MSG		0x04	/* do not format msg before logging */
+#define SLOG_SEND_MAIL		0x08	/* log via mail */
+#define SLOG_NO_STDERR		0x10	/* do not log via stderr */
+#define SLOG_NO_LOG		0x20	/* do not log via file or syslog */
 
 /*
  * Maximum number of characters to log per entry.  The syslogger
@@ -74,6 +75,7 @@ bool log_denial(int status, bool inform_user);
 bool log_failure(int status, int flags);
 bool log_warning(int flags, const char *fmt, ...) __printflike(2, 3);
 bool log_warningx(int flags, const char *fmt, ...) __printflike(2, 3);
+bool gai_log_warning(int flags, int errnum, const char *fmt, ...) __printflike(3, 4);
 bool sudoers_initlocale(const char *ulocale, const char *slocale);
 bool sudoers_locale_callback(const union sudo_defs_val *);
 int writeln_wrap(FILE *fp, char *line, size_t len, size_t maxlen);
diff --git a/plugins/sudoers/sudoers.c b/plugins/sudoers/sudoers.c
index 55822afd8..ffc002cab 100644
--- a/plugins/sudoers/sudoers.c
+++ b/plugins/sudoers/sudoers.c
@@ -1010,29 +1010,30 @@ set_loginclass(struct passwd *pw)
  * Returns true on success, setting longp and shortp.
  * Returns false on failure, longp and shortp are unchanged.
  */
-static bool
+static int
 resolve_host(const char *host, char **longp, char **shortp)
 {
     struct addrinfo *res0, hint;
     char *cp, *lname, *sname;
+    int ret;
     debug_decl(resolve_host, SUDOERS_DEBUG_PLUGIN)
 
     memset(&hint, 0, sizeof(hint));
     hint.ai_family = PF_UNSPEC;
     hint.ai_flags = AI_FQDN;
 
-    if (getaddrinfo(host, NULL, &hint, &res0) != 0)
-	debug_return_bool(false);
+    if ((ret = getaddrinfo(host, NULL, &hint, &res0)) != 0)
+	debug_return_int(ret);
     if ((lname = strdup(res0->ai_canonname)) == NULL) {
 	freeaddrinfo(res0);
-	debug_return_bool(false);
+	debug_return_int(EAI_MEMORY);
     }
     if ((cp = strchr(lname, '.')) != NULL) {
 	sname = strndup(lname, (size_t)(cp - lname));
 	if (sname == NULL) {
 	    free(lname);
 	    freeaddrinfo(res0);
-	    debug_return_bool(false);
+	    debug_return_int(EAI_MEMORY);
 	}
     } else {
 	sname = lname;
@@ -1041,7 +1042,7 @@ resolve_host(const char *host, char **longp, char **shortp)
     *longp = lname;
     *shortp = sname;
 
-    debug_return_bool(true);
+    debug_return_bool(0);
 }
 
 /*
@@ -1063,9 +1064,10 @@ cb_fqdn(const union sudo_defs_val *sd_un)
     remote = strcmp(user_runhost, user_host) != 0;
 
     /* First resolve user_host, setting user_host and user_shost. */
-    if (!resolve_host(user_host, &lhost, &shost)) {
-	if (!resolve_host(user_runhost, &lhost, &shost)) {
-	    log_warning(SLOG_SEND_MAIL|SLOG_RAW_MSG,
+    if (resolve_host(user_host, &lhost, &shost) != 0) {
+	int rc = resolve_host(user_runhost, &lhost, &shost);
+	if (rc != 0) {
+	    gai_log_warning(SLOG_SEND_MAIL|SLOG_RAW_MSG, rc,
 		N_("unable to resolve host %s"), user_host);
 	    debug_return_bool(false);
 	}