From cfe194ef594f2c48f35128e20696c0b5db573f84 Mon Sep 17 00:00:00 2001
From: Ruslan Ermilov <ru@nginx.com>
Date: Tue, 24 Jul 2012 17:40:06 +0000
Subject: [PATCH] When "debug_connection" is configured with a domain name,
 only the first resolved address was used.  Now all addresses will be used.

---
 src/event/ngx_event.c | 91 +++++++++++++++++++++++++++++++------------
 1 file changed, 66 insertions(+), 25 deletions(-)

diff --git a/src/event/ngx_event.c b/src/event/ngx_event.c
index 2120ed7a2..600a43394 100644
--- a/src/event/ngx_event.c
+++ b/src/event/ngx_event.c
@@ -1062,50 +1062,91 @@ ngx_event_debug_connection(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 #if (NGX_DEBUG)
     ngx_event_conf_t  *ecf = conf;
 
-    ngx_int_t           rc;
-    ngx_str_t          *value;
-    struct hostent     *h;
-    ngx_cidr_t         *cidr;
+    ngx_int_t             rc;
+    ngx_str_t            *value;
+    ngx_url_t             u;
+    ngx_cidr_t            c, *cidr;
+    ngx_uint_t            i;
+    struct sockaddr_in   *sin;
+#if (NGX_HAVE_INET6)
+    struct sockaddr_in6  *sin6;
+#endif
 
     value = cf->args->elts;
 
-    cidr = ngx_array_push(&ecf->debug_connection);
-    if (cidr == NULL) {
-        return NGX_CONF_ERROR;
-    }
-
 #if (NGX_HAVE_UNIX_DOMAIN)
 
     if (ngx_strcmp(value[1].data, "unix:") == 0) {
-         cidr->family = AF_UNIX;
-         return NGX_CONF_OK;
+        cidr = ngx_array_push(&ecf->debug_connection);
+        if (cidr == NULL) {
+            return NGX_CONF_ERROR;
+        }
+
+        cidr->family = AF_UNIX;
+        return NGX_CONF_OK;
     }
 
 #endif
 
-    rc = ngx_ptocidr(&value[1], cidr);
+    rc = ngx_ptocidr(&value[1], &c);
+
+    if (rc != NGX_ERROR) {
+        if (rc == NGX_DONE) {
+            ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                               "low address bits of %V are meaningless",
+                               &value[1]);
+        }
+
+        cidr = ngx_array_push(&ecf->debug_connection);
+        if (cidr == NULL) {
+            return NGX_CONF_ERROR;
+        }
+
+        *cidr = c;
 
-    if (rc == NGX_DONE) {
-        ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
-                           "low address bits of %V are meaningless", &value[1]);
         return NGX_CONF_OK;
     }
 
-    if (rc == NGX_OK) {
-        return NGX_CONF_OK;
-    }
+    ngx_memzero(&u, sizeof(ngx_url_t));
+    u.host = value[1];
 
-    h = gethostbyname((char *) value[1].data);
+    if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) {
+        if (u.err) {
+            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                               "%s in debug_connection \"%V\"",
+                               u.err, &u.host);
+        }
 
-    if (h == NULL || h->h_addr_list[0] == NULL) {
-        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
-                           "host \"%s\" not found", value[1].data);
         return NGX_CONF_ERROR;
     }
 
-    cidr->family = AF_INET;
-    cidr->u.in.mask = 0xffffffff;
-    cidr->u.in.addr = *(in_addr_t *)(h->h_addr_list[0]);
+    cidr = ngx_array_push_n(&ecf->debug_connection, u.naddrs);
+    if (cidr == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    ngx_memzero(cidr, u.naddrs * sizeof(ngx_cidr_t));
+
+    for (i = 0; i < u.naddrs; i++) {
+        cidr[i].family = u.addrs[i].sockaddr->sa_family;
+
+        switch (cidr[i].family) {
+
+#if (NGX_HAVE_INET6)
+        case AF_INET6:
+            sin6 = (struct sockaddr_in6 *) u.addrs[i].sockaddr;
+            cidr[i].u.in6.addr = sin6->sin6_addr;
+            ngx_memset(cidr[i].u.in6.mask.s6_addr, 0xff, 16);
+            break;
+#endif
+
+        default: /* AF_INET */
+            sin = (struct sockaddr_in *) u.addrs[i].sockaddr;
+            cidr[i].u.in.addr = sin->sin_addr.s_addr;
+            cidr[i].u.in.mask = 0xffffffff;
+            break;
+        }
+    }
 
 #else