private static extern int bind(int fd, ref sockaddr_can addr, int addrlen);
private static extern int bind(int fd, ref sockaddr_can addr, int addrlen);
private UnixStream OpenSocket(uint?mtu)
{
/*
* sockaddr_ll sa = new sockaddr_ll();
* sa.sll_family = AF_CAN;
* sa.sll_protocol = CAN_RAW;
* sa.sll_ifindex = if_nametoindex(Interface);
*/
sockaddr_can addr = new sockaddr_can();
addr.can_family = AF_CAN;
int fd = -1, ret = -1;
try
{
fd = socket(AF_CAN, SOCK_RAW, CAN_RAW);
UnixMarshal.ThrowExceptionForLastErrorIf(fd);
ifreq ifr = new ifreq(Interface);
/* Doesn't seem to work
* ret = ioctl(fd, SIOCGIFINDEX, ref ifr);
* UnixMarshal.ThrowExceptionForLastErrorIf(ret);
*/
addr.can_ifindex = if_nametoindex(Interface);
if (addr.can_ifindex == 0)
{
throw new ArgumentException("The interface \"" + Interface + "\" is not valid.");
}
ret = bind(fd, ref addr, Marshal.SizeOf(addr));
UnixMarshal.ThrowExceptionForLastErrorIf(ret);
/*
* if (orig_mtu == 0)
* {
* ret = ioctl(fd, SIOCGIFMTU, ref ifr);
* UnixMarshal.ThrowExceptionForLastErrorIf(ret);
* orig_mtu = ifr.ifru_mtu;
* }
*
* if (mtu != null)
* {
* ifr.ifru_mtu = mtu.Value;
* //ret = ioctl(fd, SIOCSIFMTU, ref ifr);
* ret = ioctl(fd, SIOCGIFMTU, ref ifr);
* UnixMarshal.ThrowExceptionForLastErrorIf(ret);
* }
*
*/
ret = ioctl(fd, SIOCGIFMTU, ref ifr);
UnixMarshal.ThrowExceptionForLastErrorIf(ret);
/*
* if (mtu != null && ifr.ifru_mtu != mtu.Value)
* throw new PeachException("MTU change did not take effect.");
*/
_mtu = ifr.ifru_mtu;
/*
*
* if (ifr.ifru_mtu > (MaxMTU - EthernetHeaderSize))
* _bufferSize = (int)MaxMTU;
* else
* _bufferSize = (int)(ifr.ifru_mtu + EthernetHeaderSize);
*/
_bufferSize = CAN_MTU;
var stream = new UnixStream(fd);
fd = -1;
return(stream);
}
catch (InvalidOperationException ex)
{
if (ex.InnerException != null)
{
var inner = ex.InnerException as UnixIOException;
if (inner != null && inner.ErrorCode == Errno.EPERM)
{
throw new PeachException("Access denied when opening the raw ethernet publisher. Ensure the user has the appropriate permissions.", ex);
}
}
throw;
}
finally
{
if (fd != -1)
{
Syscall.close(fd);
}
}
}
private UnixStream OpenSocket(uint? mtu)
{
/*
sockaddr_ll sa = new sockaddr_ll();
sa.sll_family = AF_CAN;
sa.sll_protocol = CAN_RAW;
sa.sll_ifindex = if_nametoindex(Interface);
*/
sockaddr_can addr = new sockaddr_can();
addr.can_family = AF_CAN;
int fd = -1, ret = -1;
try
{
fd = socket(AF_CAN, SOCK_RAW, CAN_RAW);
UnixMarshal.ThrowExceptionForLastErrorIf(fd);
ifreq ifr = new ifreq(Interface);
/* Doesn't seem to work
ret = ioctl(fd, SIOCGIFINDEX, ref ifr);
UnixMarshal.ThrowExceptionForLastErrorIf(ret);
*/
addr.can_ifindex = if_nametoindex(Interface);
if (addr.can_ifindex == 0)
throw new ArgumentException("The interface \"" + Interface + "\" is not valid.");
ret = bind(fd, ref addr, Marshal.SizeOf(addr));
UnixMarshal.ThrowExceptionForLastErrorIf(ret);
/*
if (orig_mtu == 0)
{
ret = ioctl(fd, SIOCGIFMTU, ref ifr);
UnixMarshal.ThrowExceptionForLastErrorIf(ret);
orig_mtu = ifr.ifru_mtu;
}
if (mtu != null)
{
ifr.ifru_mtu = mtu.Value;
//ret = ioctl(fd, SIOCSIFMTU, ref ifr);
ret = ioctl(fd, SIOCGIFMTU, ref ifr);
UnixMarshal.ThrowExceptionForLastErrorIf(ret);
}
*/
ret = ioctl(fd, SIOCGIFMTU, ref ifr);
UnixMarshal.ThrowExceptionForLastErrorIf(ret);
/*
if (mtu != null && ifr.ifru_mtu != mtu.Value)
throw new PeachException("MTU change did not take effect.");
*/
_mtu = ifr.ifru_mtu;
/*
if (ifr.ifru_mtu > (MaxMTU - EthernetHeaderSize))
_bufferSize = (int)MaxMTU;
else
_bufferSize = (int)(ifr.ifru_mtu + EthernetHeaderSize);
*/
_bufferSize = CAN_MTU;
var stream = new UnixStream(fd);
fd = -1;
return stream;
}
catch (InvalidOperationException ex)
{
if (ex.InnerException != null)
{
var inner = ex.InnerException as UnixIOException;
if (inner != null && inner.ErrorCode == Errno.EPERM)
throw new PeachException("Access denied when opening the raw ethernet publisher. Ensure the user has the appropriate permissions.", ex);
}
throw;
}
finally
{
if (fd != -1)
Syscall.close(fd);
}
}
