X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=http_send.c;h=28e245eae13ac6b7ce8e0a5f162ab88be52b5a60;hp=8cce85a15c079599f16ea5e800082cbe0db2b215;hb=eb578d92fd87aeb86c0832689000dc772e689f92;hpb=24e2b57dde50a6fe33deee034d34181eece09834

diff --git a/http_send.c b/http_send.c
index 8cce85a1..28e245ea 100644
--- a/http_send.c
+++ b/http_send.c
@@ -25,8 +25,9 @@
 #include "fd.h"
 #include "chunk_queue.h"
 
+/** Message sent to clients that do not send a valid get request. */
 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
-/** \endcond */
+
 
 /** The possible states of a client from the server's POV. */
 enum http_status {
@@ -201,24 +202,37 @@ static void http_send( long unsigned current_chunk,
 	}
 }
 
+/**
+ * Return true if addr_1 matches addr_2 in the first `netmask' bits.
+ */
+static int v4_addr_match(uint32_t addr_1, uint32_t addr_2, uint8_t netmask)
+{
+	uint32_t mask = ~0U;
+
+	if (netmask < 32)
+		mask <<= (32 - netmask);
+	return (htonl(addr_1) & mask) == (htonl(addr_2) & mask);
+}
+
 static int host_in_access_perm_list(struct http_client *hc)
 {
-	struct sockaddr_storage   ss;
-	socklen_t                 sslen = sizeof(ss);
+	struct access_info *ai, *tmp;
+	struct sockaddr_storage ss;
+	socklen_t sslen = sizeof(ss);
+	struct in_addr v4_addr;
 
 	if (getpeername(hc->fd, (struct sockaddr *)&ss, &sslen) < 0) {
-		PARA_ERROR_LOG("can not determine address family: %s\n", strerror(errno));
-	} else if (ss.ss_family == AF_INET) {
-		/* FIXME: access restriction is (currently) only supported for IPv4 */
-		struct access_info *ai, *tmp;
-		struct in_addr client_addr = ((struct sockaddr_in *)&ss)->sin_addr;
-
-		list_for_each_entry_safe(ai, tmp, &access_perm_list, node) {
-			unsigned mask = ((~0U) >> ai->netmask);
-			if ((client_addr.s_addr & mask) == (ai->addr.s_addr & mask))
-				return 1;
-		}
+		PARA_ERROR_LOG("Can not determine peer address: %s\n", strerror(errno));
+		goto no_match;
 	}
+	v4_addr = extract_v4_addr(&ss);
+	if (!v4_addr.s_addr)
+		goto no_match;
+
+	list_for_each_entry_safe(ai, tmp, &access_perm_list, node)
+		if (v4_addr_match(v4_addr.s_addr, ai->addr.s_addr, ai->netmask))
+			return 1;
+no_match:
 	return 0;
 }