//send peer credentials null byte
//different platforms do this in different ways
#if HAVE_CMSGCRED
unsafe void WriteBsdCred()
{
//null credentials byte
byte buf = 0;
IOVector iov = new IOVector();
//iov.Base = (IntPtr)(&buf);
iov.Base = &buf;
iov.Length = 1;
msghdr msg = new msghdr();
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
cmsg cm = new cmsg();
msg.msg_control = (IntPtr)(&cm);
msg.msg_controllen = (uint)sizeof(cmsg);
cm.hdr.cmsg_len = (uint)sizeof(cmsg);
cm.hdr.cmsg_level = 0xffff; //SOL_SOCKET
cm.hdr.cmsg_type = 0x03; //SCM_CREDS
int written = socket.SendMsg(&msg, 0);
if (written != 1)
{
throw new Exception("Failed to write credentials");
}
}
// Send the two buffers and the FDs using sendmsg(), don't handle short writes
// length1 + length2 must not be 0
public unsafe long SendmsgShort(byte[] buffer1, long offset1, long length1,
byte[] buffer2, long offset2, long length2,
DBus.Protocol.UnixFDArray fds)
{
//Console.WriteLine ("SendmsgShort (X, {0}, {1}, {2}, {3}, {4}, {5})", offset1, length1, buffer2 == null ? "-" : "Y", offset2, length2, fds == null ? "-" : "" + fds.FDs.Count);
AssertValidBuffer(buffer1, offset1, length1);
if (buffer2 == null)
{
if (length2 != 0)
{
throw new ArgumentOutOfRangeException("length2", "!= 0 while buffer2 == null");
}
offset2 = 0;
}
else
{
AssertValidBuffer(buffer2, offset2, length2);
}
fixed(byte *ptr1 = buffer1, ptr2 = buffer2)
{
var iovecs = new IOVector[] {
new IOVector {
Base = (ptr1 + offset1),
Length = (int)length1,
},
new IOVector {
Base = (ptr2 + offset2),
Length = (int)length2,
},
};
/* Simulate short writes
* if (iovecs[0].iov_len == 0) {
* iovecs[1].iov_len = Math.Min (iovecs[1].iov_len, 5);
* } else {
* iovecs[0].iov_len = Math.Min (iovecs[0].iov_len, 5);
* iovecs[1].iov_len = 0;
* }
*/
byte[] cmsg = null;
// Create copy of FDs to prevent the user from Dispose()ing the
// FDs in another thread between writing the FDs into the cmsg
// buffer and calling sendmsg()
fixed(IOVector *iovecPtr = iovecs)
{
using (var fds2 = fds == null ? null : fds.Clone()) {
int fdCount = fds2 == null ? 0 : fds2.FDs.Count;
if (fdCount != 0)
{
// Create one SCM_RIGHTS control message
cmsg = new byte[CMSG_SPACE((uint)fdCount * sizeof(int))];
}
fixed(byte *cmsgPtr = cmsg)
{
var msghdr = new msghdr {
msg_iov = iovecPtr,
msg_iovlen = length2 == 0 ? 1 : 2,
msg_control = (IntPtr)cmsgPtr,
msg_controllen = cmsg == null ? 0 : (uint)cmsg.Length,
};
if (fdCount != 0)
{
var hdr = new cmsghdr {
cmsg_len = (UIntPtr)CMSG_LEN((uint)fdCount * sizeof(int)),
cmsg_level = 1, // SOL_SOCKET
cmsg_type = 1, // SCM_RIGHTS
};
*((cmsghdr *)cmsgPtr) = hdr;
var data = CMSG_DATA((cmsghdr *)cmsgPtr);
fixed(byte *ptr = cmsg)
{
for (int i = 0; i < fdCount; i++)
{
((int *)data)[i] = fds2.FDs[i].Handle;
}
}
}
long r = socket.SendMsg(&msghdr, 0);
if (r == 0)
{
throw new Exception("sendmsg() returned 0");
}
return(r);
}
}
}
}
}