source: code/branches/ipv6/src/external/enet/patches/0002-basic-IPv6-support-on-Linux-systems.patch @ 7438

From fc72c66f6b8a6b1d924ffa86861ce00a1c591839 Mon Sep 17 00:00:00 2001
From: Adrian Friedli <adi@koalatux.ch>
Date: Thu, 2 Sep 2010 14:27:07 +0200
Subject: [PATCH 2/5] basic IPv6 support on Linux systems

this uses IPv4-mapped IPv6 addresses
---
 include/enet/enet.h |   22 ++++++--
 protocol.c          |   26 +++++++---
 unix.c              |  134 ++++++++++++++++++++++++++++++---------------------
 3 files changed, 114 insertions(+), 68 deletions(-)

diff --git a/include/enet/enet.h b/include/enet/enet.h
index 2f656d6..d3ca971 100644
--- a/include/enet/enet.h
+++ b/include/enet/enet.h
@@ -53,13 +53,16 @@ typedef enum _ENetSocketOption
    ENET_SOCKOPT_REUSEADDR = 5
 } ENetSocketOption;
 
-enum
+typedef struct _ENetHostAddress
 {
-   ENET_HOST_ANY       = 0,            /**< specifies the default server host */
-   ENET_HOST_BROADCAST = 0xFFFFFFFF,   /**< specifies a subnet-wide broadcast */
+   enet_uint8 addr[16];
+} ENetHostAddress;
 
-   ENET_PORT_ANY       = 0             /**< specifies that a port should be automatically chosen */
-};
+extern const ENetHostAddress ENET_HOST_ANY;          /**< specifies the default server host */
+extern const ENetHostAddress ENET_IPV4MAPPED_PREFIX; /**< specifies the IPv4-mapped IPv6 prefix */
+extern const ENetHostAddress ENET_HOST_BROADCAST;    /**< specifies a IPv4 subnet-wide broadcast */
+#define ENET_IPV4MAPPED_PREFIX_LEN 12                /**< specifies the length of the IPv4-mapped IPv6 prefix */
+#define ENET_PORT_ANY 0                              /**< specifies that a port should be automatically chosen */
 
 /**
  * Portable internet address structure. 
@@ -73,7 +76,8 @@ enum
  */
 typedef struct _ENetAddress
 {
-   enet_uint32 host;
+   ENetHostAddress host;
+   enet_uint32 scopeID; //FIXME: this is of different size on Windows
    enet_uint16 port;
 } ENetAddress;
 
@@ -488,6 +492,12 @@ ENET_API int enet_address_get_host_ip (const ENetAddress * address, char * hostN
 */
 ENET_API int enet_address_get_host (const ENetAddress * address, char * hostName, size_t nameLength);
 
+/** Maps an IPv4 Address to an IPv6 address.
+    @param address IPv4 address in network byte order
+    @returns the IPv4-mapped IPv6 address in network byte order
+*/
+ENET_API ENetHostAddress enet_address_map4 (enet_uint32 address);
+
 /** @} */
 
 ENET_API ENetPacket * enet_packet_create (const void *, size_t, enet_uint32);
diff --git a/protocol.c b/protocol.c
index 8e26dfb..930835e 100644
--- a/protocol.c
+++ b/protocol.c
@@ -9,6 +9,10 @@
 #include "enet/time.h"
 #include "enet/enet.h"
 
+const ENetHostAddress ENET_HOST_ANY = { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } };
+const ENetHostAddress ENET_IPV4MAPPED_PREFIX = { { 0,0,0,0,0,0,0,0,0,0, 0xff, 0xff, 0,0,0,0 } };
+const ENetHostAddress ENET_HOST_BROADCAST = { { 0,0,0,0,0,0,0,0,0,0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff } };
+
 static size_t commandSizes [ENET_PROTOCOL_COMMAND_COUNT] =
 {
     0,
@@ -25,6 +29,14 @@ static size_t commandSizes [ENET_PROTOCOL_COMMAND_COUNT] =
     sizeof (ENetProtocolThrottleConfigure),
 };
 
+ENetHostAddress
+enet_address_map4 (enet_uint32 address)
+{
+    ENetHostAddress addr = ENET_IPV4MAPPED_PREFIX;
+    ((enet_uint32 *)addr.addr)[3] = address;
+    return addr;
+}
+
 size_t
 enet_protocol_command_size (enet_uint8 commandNumber)
 {
@@ -262,9 +274,9 @@ enet_protocol_handle_connect (ENetHost * host, ENetProtocolHeader * header, ENet
          ++ currentPeer)
     {
         if (currentPeer -> state != ENET_PEER_STATE_DISCONNECTED &&
-            currentPeer -> address.host == host -> receivedAddress.host &&
             currentPeer -> address.port == host -> receivedAddress.port &&
-            currentPeer -> connectID == command -> connect.connectID)
+            currentPeer -> connectID == command -> connect.connectID &&
+            !memcmp(& currentPeer -> address.host, & host -> receivedAddress.host, sizeof (ENetHostAddress)))
           return NULL;
     }
 
@@ -848,10 +860,11 @@ enet_protocol_handle_incoming_commands (ENetHost * host, ENetEvent * event)
 
        if (peer -> state == ENET_PEER_STATE_DISCONNECTED ||
            peer -> state == ENET_PEER_STATE_ZOMBIE ||
-           (host -> receivedAddress.host != peer -> address.host &&
-             peer -> address.host != ENET_HOST_BROADCAST) ||
            (peer -> outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID &&
-            sessionID != peer -> incomingSessionID))
+            sessionID != peer -> incomingSessionID) ||
+           ( memcmp(& peer -> address.host, & host -> receivedAddress.host, sizeof (ENetHostAddress)) &&
+             memcmp(& peer -> address.host, & ENET_HOST_BROADCAST, sizeof (ENetHostAddress)) &&
+             peer -> address.host.addr[0] != 0xff ) )
          return 0;
     }
  
@@ -891,8 +904,7 @@ enet_protocol_handle_incoming_commands (ENetHost * host, ENetEvent * event)
        
     if (peer != NULL)
     {
-       peer -> address.host = host -> receivedAddress.host;
-       peer -> address.port = host -> receivedAddress.port;
+       peer -> address = host -> receivedAddress;
        peer -> incomingDataTotal += host -> receivedDataLength;
     }
     
diff --git a/unix.c b/unix.c
index 7329e8d..de032bb 100644
--- a/unix.c
+++ b/unix.c
@@ -71,30 +71,72 @@ enet_time_set (enet_uint32 newTimeBase)
     timeBase = timeVal.tv_sec * 1000 + timeVal.tv_usec / 1000 - newTimeBase;
 }
 
+static int
+enet_address_set_address (ENetAddress * address, const struct sockaddr * sin)
+{
+    memset (address, 0, sizeof (ENetAddress));
+    if (sin -> sa_family == AF_INET)
+    {
+        address -> host = enet_address_map4 ((((struct sockaddr_in *) sin) -> sin_addr.s_addr));
+        //address -> scopeID = 0;
+        address -> port = ENET_NET_TO_HOST_16 (((struct sockaddr_in *) sin) -> sin_port);
+        return 0;
+    }
+    if (sin -> sa_family == AF_INET6)
+    {
+        address -> host = * (ENetHostAddress *) & ((struct sockaddr_in6 *) sin) -> sin6_addr;
+        address -> scopeID = ((struct sockaddr_in6 *) sin) -> sin6_scope_id;
+        address -> port = ENET_NET_TO_HOST_16 (((struct sockaddr_in6 *) sin) -> sin6_port);
+        return 0;
+    }
+    return -1;
+}
+
+static int
+enet_address_set_sin (struct sockaddr * sin, const ENetAddress * address, sa_family_t family)
+{
+    if (family == AF_INET)
+    {
+        memset (sin, 0, sizeof (struct sockaddr_in));
+        ((struct sockaddr_in *) sin) -> sin_family = AF_INET;
+        ((struct sockaddr_in *) sin) -> sin_addr = * (struct in_addr *) & address -> host.addr[12];
+        ((struct sockaddr_in *) sin) -> sin_port = ENET_HOST_TO_NET_16 (address -> port);
+        return 0;
+    }
+    else if (family == AF_INET6)
+    {
+        memset (sin, 0, sizeof (struct sockaddr_in6));
+        ((struct sockaddr_in6 *) sin) -> sin6_family = AF_INET6;
+        ((struct sockaddr_in6 *) sin) -> sin6_addr = * (struct in6_addr *) & address -> host;
+        ((struct sockaddr_in6 *) sin) -> sin6_scope_id = address -> scopeID;
+        ((struct sockaddr_in6 *) sin) -> sin6_port = ENET_HOST_TO_NET_16 (address -> port);
+        return 0;
+    }
+    return -1;
+}
+
 int
 enet_address_set_host (ENetAddress * address, const char * name)
 {
+    enet_uint16 port = address -> port;
     struct addrinfo hints;
     struct addrinfo * result;
     struct addrinfo * res;
 
     memset(& hints, 0, sizeof (hints));
-    hints.ai_flags = AI_NUMERICSERV;
-    hints.ai_family = AF_INET;
+    hints.ai_flags = AI_NUMERICSERV | AI_ADDRCONFIG;
+    hints.ai_family = AF_UNSPEC;
 
     if ( getaddrinfo(name, NULL, &hints, &result) )
-    {
         return -1;
-    }
 
     for (res = result; res != NULL; res = res -> ai_next)
     {
-        if (res -> ai_family == AF_INET)
-        {
-            address -> host = ((struct sockaddr_in *) res -> ai_addr ) -> sin_addr.s_addr;
+        if ( !enet_address_set_address(address, res -> ai_addr) )
             break;
-        }
     }
+
+    address -> port = port;
     freeaddrinfo(result);
     if (res == NULL) return -1;
 
@@ -104,17 +146,11 @@ enet_address_set_host (ENetAddress * address, const char * name)
 static int
 enet_address_get_host_x (const ENetAddress * address, char * name, size_t nameLength, int flags)
 {
-    struct sockaddr_in sin;
-
-    memset (& sin, 0, sizeof (struct sockaddr_in));
+    struct sockaddr_storage sin;
+    enet_address_set_sin((struct sockaddr *) & sin, address, AF_INET6);
 
-    sin.sin_family = AF_INET;
-    sin.sin_addr = * (struct in_addr *) & address -> host;
-
-    if ( getnameinfo((struct sockaddr *) & sin, sizeof(sin), name, nameLength, NULL, 0, flags))
-    {
+    if ( getnameinfo((struct sockaddr *) & sin, sizeof(struct sockaddr_in6), name, nameLength, NULL, 0, flags))
         return -1;
-    }
 
     return 0;
 }
@@ -134,29 +170,22 @@ enet_address_get_host (const ENetAddress * address, char * name, size_t nameLeng
 int
 enet_socket_bind (ENetSocket socket, const ENetAddress * address)
 {
-    struct sockaddr_in sin;
-
-    memset (& sin, 0, sizeof (struct sockaddr_in));
-
-    sin.sin_family = AF_INET;
+    struct sockaddr_storage sin;
 
     if (address != NULL)
     {
-       sin.sin_port = ENET_HOST_TO_NET_16 (address -> port);
-       sin.sin_addr.s_addr = address -> host;
+        enet_address_set_sin((struct sockaddr *) & sin, address, AF_INET6);
     }
     else
     {
-       sin.sin_port = 0;
-       sin.sin_addr.s_addr = INADDR_ANY;
+        ENetAddress address_ = { ENET_HOST_ANY, 0, 0 };
+        enet_address_set_sin((struct sockaddr *) & sin, & address_, AF_INET6);
     }
 
-    return bind (socket,
-                 (struct sockaddr *) & sin,
-                 sizeof (struct sockaddr_in)); 
+    return bind (socket, (struct sockaddr *) & sin, sizeof (struct sockaddr_in6));
 }
 
-int 
+int
 enet_socket_listen (ENetSocket socket, int backlog)
 {
     return listen (socket, backlog < 0 ? SOMAXCONN : backlog);
@@ -165,7 +194,14 @@ enet_socket_listen (ENetSocket socket, int backlog)
 ENetSocket
 enet_socket_create (ENetSocketType type)
 {
-    return socket (PF_INET, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
+    ENetSocket sock = socket (AF_INET6, type == ENET_SOCKET_TYPE_DATAGRAM ? SOCK_DGRAM : SOCK_STREAM, 0);
+
+#ifdef IPV6_V6ONLY
+    int value = 0;
+    setsockopt (sock, IPPROTO_IPV6, IPV6_V6ONLY, & value, sizeof (int));
+#endif // IPV6_V6ONLY
+
+    return sock;
 }
 
 int
@@ -207,23 +243,18 @@ enet_socket_set_option (ENetSocket socket, ENetSocketOption option, int value)
 int
 enet_socket_connect (ENetSocket socket, const ENetAddress * address)
 {
-    struct sockaddr_in sin;
+    struct sockaddr_storage sin;
+    enet_address_set_sin((struct sockaddr *) & sin, address, AF_INET6);
 
-    memset (& sin, 0, sizeof (struct sockaddr_in));
-
-    sin.sin_family = AF_INET;
-    sin.sin_port = ENET_HOST_TO_NET_16 (address -> port);
-    sin.sin_addr.s_addr = address -> host;
-
-    return connect (socket, (struct sockaddr *) & sin, sizeof (struct sockaddr_in));
+    return connect (socket, (struct sockaddr *) & sin, sizeof (struct sockaddr_in6));
 }
 
 ENetSocket
 enet_socket_accept (ENetSocket socket, ENetAddress * address)
 {
     int result;
-    struct sockaddr_in sin;
-    socklen_t sinLength = sizeof (struct sockaddr_in);
+    struct sockaddr_storage sin;
+    socklen_t sinLength = sizeof (struct sockaddr_in6);
 
     result = accept (socket, 
                      address != NULL ? (struct sockaddr *) & sin : NULL, 
@@ -234,8 +265,7 @@ enet_socket_accept (ENetSocket socket, ENetAddress * address)
 
     if (address != NULL)
     {
-        address -> host = (enet_uint32) sin.sin_addr.s_addr;
-        address -> port = ENET_NET_TO_HOST_16 (sin.sin_port);
+        enet_address_set_address(address, (struct sockaddr *) & sin);
     }
 
     return result;
@@ -254,21 +284,16 @@ enet_socket_send (ENetSocket socket,
                   size_t bufferCount)
 {
     struct msghdr msgHdr;
-    struct sockaddr_in sin;
+    struct sockaddr_storage sin;
     int sentLength;
 
     memset (& msgHdr, 0, sizeof (struct msghdr));
 
     if (address != NULL)
     {
-        memset (& sin, 0, sizeof (struct sockaddr_in));
-
-        sin.sin_family = AF_INET;
-        sin.sin_port = ENET_HOST_TO_NET_16 (address -> port);
-        sin.sin_addr.s_addr = address -> host;
-
+        enet_address_set_sin((struct sockaddr *) & sin, address, AF_INET6);
         msgHdr.msg_name = & sin;
-        msgHdr.msg_namelen = sizeof (struct sockaddr_in);
+        msgHdr.msg_namelen = sizeof (struct sockaddr_in6);
     }
 
     msgHdr.msg_iov = (struct iovec *) buffers;
@@ -294,7 +319,7 @@ enet_socket_receive (ENetSocket socket,
                      size_t bufferCount)
 {
     struct msghdr msgHdr;
-    struct sockaddr_in sin;
+    struct sockaddr_storage sin;
     int recvLength;
 
     memset (& msgHdr, 0, sizeof (struct msghdr));
@@ -302,7 +327,7 @@ enet_socket_receive (ENetSocket socket,
     if (address != NULL)
     {
         msgHdr.msg_name = & sin;
-        msgHdr.msg_namelen = sizeof (struct sockaddr_in);
+        msgHdr.msg_namelen = sizeof (struct sockaddr_in6);
     }
 
     msgHdr.msg_iov = (struct iovec *) buffers;
@@ -325,8 +350,7 @@ enet_socket_receive (ENetSocket socket,
 
     if (address != NULL)
     {
-        address -> host = (enet_uint32) sin.sin_addr.s_addr;
-        address -> port = ENET_NET_TO_HOST_16 (sin.sin_port);
+        enet_address_set_address(address, (struct sockaddr *) & sin);
     }
 
     return recvLength;
-- 
1.7.1