Core: extended ngx_sock_ntop() with socklen parameter.

On Linux, sockaddr length is required to process unix socket addresses properly
due to unnamed sockets (which don't have sun_path set at all) and abstract
namespace sockets.

src/core/ngx_connection.c

diff --git a/src/core/ngx_connection.c b/src/core/ngx_connection.c
index 7ed781e..553a938 100644
--- a/src/core/ngx_connection.c
+++ b/src/core/ngx_connection.c
@@ -41,7 +41,7 @@
     ls->sockaddr = sa;
     ls->socklen = socklen;
 
-    len = ngx_sock_ntop(sa, text, NGX_SOCKADDR_STRLEN, 1);
+    len = ngx_sock_ntop(sa, socklen, text, NGX_SOCKADDR_STRLEN, 1);
     ls->addr_text.len = len;
 
     switch (ls->sockaddr->sa_family) {
@@ -152,7 +152,8 @@
             return NGX_ERROR;
         }
 
-        len = ngx_sock_ntop(ls[i].sockaddr, ls[i].addr_text.data, len, 1);
+        len = ngx_sock_ntop(ls[i].sockaddr, ls[i].socklen,
+                            ls[i].addr_text.data, len, 1);
         if (len == 0) {
             return NGX_ERROR;
         }
@@ -1068,7 +1069,7 @@
         return NGX_OK;
     }
 
-    s->len = ngx_sock_ntop(c->local_sockaddr, s->data, s->len, port);
+    s->len = ngx_sock_ntop(c->local_sockaddr, len, s->data, s->len, port);
 
     return NGX_OK;
 }

src/core/ngx_inet.c

diff --git a/src/core/ngx_inet.c b/src/core/ngx_inet.c
index 7757ab7..5dca72b 100644
--- a/src/core/ngx_inet.c
+++ b/src/core/ngx_inet.c
@@ -174,7 +174,8 @@
 
 
 size_t
-ngx_sock_ntop(struct sockaddr *sa, u_char *text, size_t len, ngx_uint_t port)
+ngx_sock_ntop(struct sockaddr *sa, socklen_t socklen, u_char *text, size_t len,
+    ngx_uint_t port)
 {
     u_char               *p;
     struct sockaddr_in   *sin;
@@ -230,9 +231,18 @@
     case AF_UNIX:
         saun = (struct sockaddr_un *) sa;
 
+        /* on Linux sockaddr might not include sun_path at all */
+
+        if (socklen <= offsetof(struct sockaddr_un, sun_path)) {
+            p = ngx_snprintf(text, len, "unix:%Z");
+
+        } else {
+            p = ngx_snprintf(text, len, "unix:%s%Z", saun->sun_path);
+        }
+
         /* we do not include trailing zero in address length */
 
-        return ngx_snprintf(text, len, "unix:%s%Z", saun->sun_path) - text - 1;
+        return (p - text - 1);
 
 #endif
 
@@ -1020,7 +1030,7 @@
             goto failed;
         }
 
-        len = ngx_sock_ntop((struct sockaddr *) sin, p, len, 1);
+        len = ngx_sock_ntop((struct sockaddr *) sin, rp->ai_addrlen, p, len, 1);
 
         u->addrs[i].name.len = len;
         u->addrs[i].name.data = p;
@@ -1053,7 +1063,8 @@
             goto failed;
         }
 
-        len = ngx_sock_ntop((struct sockaddr *) sin6, p, len, 1);
+        len = ngx_sock_ntop((struct sockaddr *) sin6, rp->ai_addrlen, p,
+                            len, 1);
 
         u->addrs[i].name.len = len;
         u->addrs[i].name.data = p;
@@ -1138,7 +1149,8 @@
                 return NGX_ERROR;
             }
 
-            len = ngx_sock_ntop((struct sockaddr *) sin, p, len, 1);
+            len = ngx_sock_ntop((struct sockaddr *) sin,
+                                sizeof(struct sockaddr_in), p, len, 1);
 
             u->addrs[i].name.len = len;
             u->addrs[i].name.data = p;

src/core/ngx_inet.h

diff --git a/src/core/ngx_inet.h b/src/core/ngx_inet.h
index 6a5a368..d8f44c1 100644
--- a/src/core/ngx_inet.h
+++ b/src/core/ngx_inet.h
@@ -107,8 +107,8 @@
 ngx_int_t ngx_inet6_addr(u_char *p, size_t len, u_char *addr);
 size_t ngx_inet6_ntop(u_char *p, u_char *text, size_t len);
 #endif
-size_t ngx_sock_ntop(struct sockaddr *sa, u_char *text, size_t len,
-    ngx_uint_t port);
+size_t ngx_sock_ntop(struct sockaddr *sa, socklen_t socklen, u_char *text,
+    size_t len, ngx_uint_t port);
 size_t ngx_inet_ntop(int family, void *addr, u_char *text, size_t len);
 ngx_int_t ngx_ptocidr(ngx_str_t *text, ngx_cidr_t *cidr);
 ngx_int_t ngx_parse_addr(ngx_pool_t *pool, ngx_addr_t *addr, u_char *text,