BUG/MINOR: checks: Respect the no-check-ssl option

This options is used to force a non-SSL connection to check a SSL server or to
invert a check-ssl option inherited from the default section. The use_ssl field
in the check structure is used to know if a SSL connection must be used
(use_ssl=1) or not (use_ssl=0). The server configuration is used by default.

The problem is that we cannot distinguish the default case (no specific SSL
check option) and the case of an explicit non-SSL check. In both, use_ssl is set
to 0. So the server configuration is always used. For a SSL server, when
no-check-ssl option is set, the check is still performed using a SSL
configuration.

To fix the bug, instead of a boolean value (0=TCP, 1=SSL), we use a ternary value :

  * 0  = use server config
  * 1  = force SSL
  * -1 = force non-SSL

The same is done for the server parameter. It is not really necessary for
now. But it is a good way to know is the server no-ssl option is set.

In addition, the PR_O_TCPCHK_SSL proxy option is no longer used to set use_ssl
to 1 for a check. Instead the flag is directly tested to prepare or destroy the
server SSL context.

This patch should be backported as far as 1.8.
diff --git a/src/cfgparse.c b/src/cfgparse.c
index 59bdb3b..926cd1d 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -3252,7 +3252,7 @@
 			}
 
 			/* this will also properly set the transport layer for prod and checks */
-			if (newsrv->use_ssl || newsrv->check.use_ssl) {
+			if (newsrv->use_ssl == 1 || newsrv->check.use_ssl == 1 || (newsrv->proxy->options & PR_O_TCPCHK_SSL)) {
 				if (xprt_get(XPRT_SSL) && xprt_get(XPRT_SSL)->prepare_srv)
 					cfgerr += xprt_get(XPRT_SSL)->prepare_srv(newsrv);
 			}
@@ -4005,7 +4005,7 @@
 				p = curpeers->remote;
 				while (p) {
 					if (p->srv) {
-						if (p->srv->use_ssl && xprt_get(XPRT_SSL) && xprt_get(XPRT_SSL)->prepare_srv)
+						if (p->srv->use_ssl == 1 && xprt_get(XPRT_SSL) && xprt_get(XPRT_SSL)->prepare_srv)
 							cfgerr += xprt_get(XPRT_SSL)->prepare_srv(p->srv);
 					}
 					p = p->next;
diff --git a/src/checks.c b/src/checks.c
index 22a2c50..f52647b 100644
--- a/src/checks.c
+++ b/src/checks.c
@@ -1371,7 +1371,7 @@
 	default:
 		/* good connection is enough for pure TCP check */
 		if (!(conn->flags & CO_FL_WAIT_XPRT) && !check->type) {
-			if (check->use_ssl)
+			if (check->use_ssl == 1)
 				set_server_check_status(check, HCHK_STATUS_L6OK, NULL);
 			else
 				set_server_check_status(check, HCHK_STATUS_L4OK, NULL);
@@ -2366,7 +2366,7 @@
 		if (check->result == CHK_RES_UNKNOWN) {
 			/* good connection is enough for pure TCP check */
 			if (!(conn->flags & CO_FL_WAIT_XPRT) && !check->type) {
-				if (check->use_ssl)
+				if (check->use_ssl == 1)
 					set_server_check_status(check, HCHK_STATUS_L6OK, NULL);
 				else
 					set_server_check_status(check, HCHK_STATUS_L4OK, NULL);
@@ -3670,7 +3670,8 @@
 	 * default, unless one is specified.
 	 */
 	if (!chk->port && !is_addr(&chk->addr)) {
-		chk->use_ssl |= (srv->use_ssl || (srv->proxy->options & PR_O_TCPCHK_SSL));
+		if (!chk->use_ssl)
+			chk->use_ssl = srv->use_ssl;
 		chk->send_proxy |= (srv->pp_opts);
 	}
 
diff --git a/src/haproxy.c b/src/haproxy.c
index 4af56fb..a702e78 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -2686,7 +2686,7 @@
 			free(s->available_conns);
 			free(s->curr_idle_thr);
 
-			if (s->use_ssl || s->check.use_ssl) {
+			if (s->use_ssl == 1 || s->check.use_ssl == 1 || (s->proxy->options & PR_O_TCPCHK_SSL)) {
 				if (xprt_get(XPRT_SSL) && xprt_get(XPRT_SSL)->destroy_srv)
 					xprt_get(XPRT_SSL)->destroy_srv(s);
 			}
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 12b4012..224de28 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -5925,9 +5925,9 @@
 			return cfgerr;
 		}
 	}
-	if (srv->use_ssl)
+	if (srv->use_ssl == 1)
 		srv->xprt = &ssl_sock;
-	if (srv->check.use_ssl)
+	if (srv->check.use_ssl == 1)
 		srv->check.xprt = &ssl_sock;
 
 	ctx = SSL_CTX_new(SSLv23_client_method());
@@ -9956,7 +9956,7 @@
 /* parse the "no-check-ssl" server keyword */
 static int srv_parse_no_check_ssl(char **args, int *cur_arg, struct proxy *px, struct server *newsrv, char **err)
 {
-	newsrv->check.use_ssl = 0;
+	newsrv->check.use_ssl = -1;
 	free(newsrv->ssl_ctx.ciphers);
 	newsrv->ssl_ctx.ciphers = NULL;
 	newsrv->ssl_ctx.options &= ~global_ssl.connect_default_ssloptions;
@@ -9983,7 +9983,7 @@
 /* parse the "no-ssl" server keyword */
 static int srv_parse_no_ssl(char **args, int *cur_arg, struct proxy *px, struct server *newsrv, char **err)
 {
-	newsrv->use_ssl = 0;
+	newsrv->use_ssl = -1;
 	free(newsrv->ssl_ctx.ciphers);
 	newsrv->ssl_ctx.ciphers = NULL;
 	return 0;