add openssl 1.1 support

changes:
  - CRYPTO_lock detection replaced in configure.ac. We don't use that
    function anywhere, so just replace it with the suggested one from
    https://wiki.openssl.org/index.php/Library_Initialization#Autoconf
  - OPENSSL_NO_SSL2 is no longer defined while ssl2 is not included.
    Set it ourself using the suggested openssl 1.1 version check from
    https://wiki.openssl.org/index.php/1.1_API_Changes#Backward_compatibility
  - openssl 1.1 sends a sigpipe if the connection is still open when
    calling SSL_shutdown(), so move the close before the shutdown.

Signed-off-by: Sven Nierlein <sven@nierlein.de>

4 files changed, 16 insertions, 7 deletions

diff --git a/plugins/check_http.c b/plugins/check_http.c
index 60fe4d52..2347a6f2 100644
--- a/plugins/check_http.c
+++ b/plugins/check_http.c
@@ -941,8 +941,8 @@ check_http (void)
     elapsed_time_ssl = (double)microsec_ssl / 1.0e6;
     if (check_cert == TRUE) {
       result = np_net_ssl_check_cert(days_till_exp_warn, days_till_exp_crit);
-      np_net_ssl_cleanup();
       if (sd) close(sd);
+      np_net_ssl_cleanup();
       return result;
     }
   }
@@ -1086,10 +1086,10 @@ check_http (void)
     die (STATE_CRITICAL, _("HTTP CRITICAL - No data received from host\n"));
 
   /* close the connection */
+  if (sd) close(sd);
 #ifdef HAVE_SSL
   np_net_ssl_cleanup();
 #endif
-  if (sd) close(sd);
 
   /* Save check time */
   microsec = deltime (tv);
diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c
index 1996c6d3..f5a6fa3d 100644
--- a/plugins/check_smtp.c
+++ b/plugins/check_smtp.c
@@ -239,8 +239,8 @@ main (int argc, char **argv)
                   result = np_net_ssl_init(sd);
                   if(result != STATE_OK) {
                     printf (_("CRITICAL - Cannot create SSL context.\n"));
-                    np_net_ssl_cleanup();
                     close(sd);
+                    np_net_ssl_cleanup();
                     return STATE_CRITICAL;
                   } else {
                         ssl_established = 1;
@@ -764,10 +764,12 @@ recvlines(char *buf, size_t bufsize)
 int
 my_close (void)
 {
+        int result;
+        result = close(sd);
 #ifdef HAVE_SSL
-  np_net_ssl_cleanup();
+        np_net_ssl_cleanup();
 #endif
-  return close(sd);
+        return result;
 }
 
 
diff --git a/plugins/check_tcp.c b/plugins/check_tcp.c
index 6dc9aa96..61333bd7 100644
--- a/plugins/check_tcp.c
+++ b/plugins/check_tcp.c
@@ -247,8 +247,8 @@ main (int argc, char **argv)
                 }
         }
         if(result != STATE_OK){
-                np_net_ssl_cleanup();
                 if(sd) close(sd);
+                np_net_ssl_cleanup();
                 return result;
         }
 #endif /* HAVE_SSL */
@@ -321,10 +321,10 @@ main (int argc, char **argv)
         if (server_quit != NULL) {
                 my_send(server_quit, strlen(server_quit));
         }
+        if (sd) close (sd);
 #ifdef HAVE_SSL
         np_net_ssl_cleanup();
 #endif
-        if (sd) close (sd);
 
         microsec = deltime (tv);
         elapsed_time = (double)microsec / 1.0e6;
diff --git a/plugins/common.h b/plugins/common.h
index 01003b3b..8719b502 100644
--- a/plugins/common.h
+++ b/plugins/common.h
@@ -161,6 +161,13 @@
 #  endif
 #endif
 
+/* openssl 1.1 does not set OPENSSL_NO_SSL2 by default but ships without ssl2 */
+#ifdef OPENSSL_VERSION_NUMBER
+#  if OPENSSL_VERSION_NUMBER >= 0x10100000
+#   define OPENSSL_NO_SSL2
+#  endif
+#endif
+
 /*
  *
  * Standard Values