resolv.conf: fixed a bug that when a newline character is present at the end of the resolv.conf file, the parser incorrectly included such newline in the parsed address.

Signed-off-by: Yichun Zhang (agentzh) <agentzh@gmail.com>

patches/nginx-1.13.6-resolver_conf_parsing.patch

@@ -1,5 +1,5 @@
 diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
-index cd55520c..d8dc49e8 100644
+index cd55520c..df55a484 100644
 --- a/src/core/ngx_resolver.c
 +++ b/src/core/ngx_resolver.c
 @@ -5,6 +5,7 @@
@@ -25,7 +25,7 @@ index cd55520c..d8dc49e8 100644
  
  typedef struct {
      u_char  ident_hi;
-@@ -131,6 +140,182 @@ static ngx_resolver_node_t *ngx_resolver_lookup_addr6(ngx_resolver_t *r,
+@@ -131,6 +140,189 @@ static ngx_resolver_node_t *ngx_resolver_lookup_addr6(ngx_resolver_t *r,
  #endif
  
  
@@ -127,7 +127,14 @@ index cd55520c..d8dc49e8 100644
 +                ngx_memzero(&u, sizeof(ngx_url_t));
 +
 +                u.url.data = buf + address;
-+                u.url.len = (i == n - 1) ? n - address : i - address;
++
++                if (i == n - 1 && buf[i] != CR && buf[i] != LF) {
++                    u.url.len = n - address;
++
++                } else {
++                    u.url.len = i - address;
++                }
++
 +                u.default_port = 53;
 +
 +                /* IPv6? */
@@ -208,7 +215,7 @@ index cd55520c..d8dc49e8 100644
  ngx_resolver_t *
  ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
  {
-@@ -246,6 +431,37 @@ ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
+@@ -246,6 +438,37 @@ ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
          }
  #endif
  

t/001-resolver.t

@@ -343,3 +343,40 @@ done
 --- error_log
 IPv6 resolver address is too long: "2001:4860:4860::8888:2001:4860:4860::8888:2001"
 unable to parse local resolver
+
+
+
+=== TEST 11: new line at the end of the file
+--- config
+    resolver local=../html/resolv.conf ipv6=off;
+    resolver_timeout 5s;
+
+    location /t {
+        content_by_lua_block {
+            local sock = ngx.socket.tcp()
+            local ok, err = sock:connect("openresty.org", 80)
+            if not ok then
+                ngx.say("failed to connect to openresty.org: ", err)
+                return
+            end
+            ngx.say("successfully connected to openresty.org")
+            sock:close()
+        }
+    }
+--- user_files eval
+">>> resolv.conf
+domain example.com
+nameserver 8.8.8.8
+nameserver 8.8.4.4
+"
+--- request
+GET /t
+--- response_body
+successfully connected to openresty.org
+--- no_error_log
+[error]
+[crit]
+--- grep_error_log eval: qr/parsed a resolver: ".+"/
+--- grep_error_log_out
+parsed a resolver: "8.8.8.8"
+parsed a resolver: "8.8.4.4"