From 2617a91597caba43c435dfbafb4628995a6adb79 Mon Sep 17 00:00:00 2001 From: Corinna Vinschen Date: Mon, 8 Apr 2013 17:34:34 +0000 Subject: * fhandler_socket.cc (get_inet_addr): Handle abstract AF_LOCAL socket. (fhandler_socket::recv_internal): Create abstract socket name for AF_LOCAL datagram sockets. Explain why we do that. --- winsup/cygwin/fhandler_socket.cc | 37 +++++++++++++++++++++++++++++++++---- 1 file changed, 33 insertions(+), 4 deletions(-) (limited to 'winsup/cygwin/fhandler_socket.cc') diff --git a/winsup/cygwin/fhandler_socket.cc b/winsup/cygwin/fhandler_socket.cc index 1ccc7f81d..c76fa47c3 100644 --- a/winsup/cygwin/fhandler_socket.cc +++ b/winsup/cygwin/fhandler_socket.cc @@ -72,6 +72,21 @@ get_inet_addr (const struct sockaddr *in, int inlen, switch (in->sa_family) { case AF_LOCAL: + /* Check for abstract socket. These are generated for AF_LOCAL datagram + sockets in recv_internal, to allow a datagram server to use sendto + after recvfrom. */ + if (inlen >= (int) sizeof (in->sa_family) + 7 + && in->sa_data[0] == '\0' && in->sa_data[1] == 'd' + && in->sa_data[6] == '\0') + { + struct sockaddr_in addr; + addr.sin_family = AF_INET; + sscanf (in->sa_data + 2, "%04hx", &addr.sin_port); + addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK); + *outlen = sizeof addr; + memcpy (out, &addr, *outlen); + return 0; + } break; case AF_INET: case AF_INET6: @@ -1502,14 +1517,28 @@ fhandler_socket::recv_internal (LPWSAMSG wsamsg, bool use_recvmsg) if (get_addr_family () == AF_LOCAL && wsamsg->name != NULL && orig_namelen >= (int) sizeof (sa_family_t)) { - /* WSARecvFrom copied the sockaddr_in block to wsamsg->name. - We have to overwrite it with a sockaddr_un block. */ + /* WSARecvFrom copied the sockaddr_in block to wsamsg->name. We have to + overwrite it with a sockaddr_un block. For datagram sockets we + generate a sockaddr_un with a filename analogue to abstract socket + names under Linux. See `man 7 unix' under Linux for a description. */ sockaddr_un *un = (sockaddr_un *) wsamsg->name; un->sun_family = AF_LOCAL; int len = orig_namelen - offsetof (struct sockaddr_un, sun_path); if (len > 0) - { - if (!get_peer_sun_path ()) + { + if (get_socket_type () == SOCK_DGRAM) + { + if (len >= 7) + { + __small_sprintf (un->sun_path + 1, "d%04x", + ((struct sockaddr_in *) wsamsg->name)->sin_port); + wsamsg->namelen = offsetof (struct sockaddr_un, sun_path) + 7; + } + else + wsamsg->namelen = offsetof (struct sockaddr_un, sun_path) + 1; + un->sun_path[0] = '\0'; + } + else if (!get_peer_sun_path ()) wsamsg->namelen = sizeof (sa_family_t); else { -- cgit v1.2.3