[PATCH] Mail: fix support for unix sockets in auth_http

[Maxim Dounin]

# HG changeset patch
# User Maxim Dounin <mdounin at mdounin.ru>
# Date 1261615729 -10800
# Node ID c72fabe04c8d51c5d9f972aaeee1b1644d4c8ac1
# Parent  6026569dbf6419fdfef3dd31b76d6898ee3bbb17
Mail: fix support for unix sockets in auth_http.

Requests to auth_http server were produced with incorrect Host header and
as a result were rejected at least by nginx's own http server.  Use localhost
as Host header for unix sockets (consistent with http proxy module).

Reported by:	Alexey V. Degtyarev

diff --git a/src/mail/ngx_mail_auth_http_module.c b/src/mail/ngx_mail_auth_http_module.c
--- a/src/mail/ngx_mail_auth_http_module.c
+++ b/src/mail/ngx_mail_auth_http_module.c
@@ -1405,7 +1405,14 @@ ngx_mail_auth_http(ngx_conf_t *cf, ngx_c
 
     ahcf->peer = u.addrs;
 
-    ahcf->host_header = u.host;
+    if (u.family != AF_UNIX) {
+        ahcf->host_header = u.host;
+
+    } else {
+        ahcf->host_header.len = sizeof("localhost") - 1;
+        ahcf->host_header.data = (u_char *) "localhost";
+    }
+
     ahcf->uri = u.uri;
 
     if (ahcf->uri.len == 0) {