Core: disabled SO_REUSEADDR on UDP sockets while testing config.
On Linux, SO_REUSEADDR allows completely duplicate UDP sockets, so using
SO_REUSEADDR when testing configuration results in packets being dropped
if there is an existing traffic on the sockets being tested (ticket #2187).
While dropped packets are expected with UDP, it is better to avoid this
when possible.
With this change, SO_REUSEADDR is no longer set on datagram sockets when
testing configuration.
diff --git a/src/core/ngx_connection.c b/src/core/ngx_connection.c
index 8339e2b..fe729a7 100644
--- a/src/core/ngx_connection.c
+++ b/src/core/ngx_connection.c
@@ -495,21 +495,24 @@
return NGX_ERROR;
}
- if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
- (const void *) &reuseaddr, sizeof(int))
- == -1)
- {
- ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
- "setsockopt(SO_REUSEADDR) %V failed",
- &ls[i].addr_text);
+ if (ls[i].type != SOCK_DGRAM || !ngx_test_config) {
- if (ngx_close_socket(s) == -1) {
+ if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
+ (const void *) &reuseaddr, sizeof(int))
+ == -1)
+ {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
- ngx_close_socket_n " %V failed",
+ "setsockopt(SO_REUSEADDR) %V failed",
&ls[i].addr_text);
- }
- return NGX_ERROR;
+ if (ngx_close_socket(s) == -1) {
+ ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
+ ngx_close_socket_n " %V failed",
+ &ls[i].addr_text);
+ }
+
+ return NGX_ERROR;
+ }
}
#if (NGX_HAVE_REUSEPORT)