/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <errno.h>
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#import "OFDDPSocket.h"
#import "OFDictionary.h"
#import "OFNumber.h"
#import "OFPair.h"
#import "OFSocket.h"
#import "OFSocket+Private.h"
#import "OFAlreadyOpenException.h"
#import "OFBindDDPSocketFailedException.h"
#import "OFGetOptionFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFNotOpenException.h"
#import "OFOutOfRangeException.h"
#import "OFReadFailedException.h"
#import "OFSetOptionFailedException.h"
#import "OFWriteFailedException.h"
#ifdef HAVE_NET_IF_H
# include <net/if.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#ifdef OF_HAVE_NETAT_APPLETALK_H
# include <netat/ddp.h>
# include <sys/ioctl.h>
/* Unfortulately, there is no struct for the following in userland headers */
struct ATInterfaceConfig {
char interfaceName[16];
unsigned int flags;
struct at_addr address, router;
unsigned short netStart, netEnd;
at_nvestr_t zoneName;
};
#endif
@implementation OFDDPSocket
@dynamic delegate;
- (OFSocketAddress)bindToNetwork: (uint16_t)network
node: (uint8_t)node
port: (uint8_t)port
protocolType: (uint8_t)protocolType
{
#ifdef OF_MACOS
const int one = 1;
struct ATInterfaceConfig config = { { 0 } };
#endif
OFSocketAddress address;
#if SOCK_CLOEXEC == 0 && defined(HAVE_FCNTL_H) && defined(FD_CLOEXEC)
int flags;
#endif
if (protocolType == 0)
@throw [OFInvalidArgumentException exception];
if (_socket != OFInvalidSocketHandle)
@throw [OFAlreadyOpenException exceptionWithObject: self];
address = OFSocketAddressMakeAppleTalk(network, node, port);
#if defined(OF_MACOS)
if ((_socket = socket(address.sockaddr.at.sat_family,
SOCK_RAW | SOCK_CLOEXEC, protocolType)) == OFInvalidSocketHandle)
#elif defined(OF_WINDOWS)
if ((_socket = socket(address.sockaddr.at.sat_family,
SOCK_DGRAM | SOCK_CLOEXEC, ATPROTO_BASE + protocolType)) ==
OFInvalidSocketHandle)
#else
if ((_socket = socket(address.sockaddr.at.sat_family,
SOCK_DGRAM | SOCK_CLOEXEC, 0)) == OFInvalidSocketHandle)
#endif
@throw [OFBindDDPSocketFailedException
exceptionWithNetwork: network
node: node
port: port
protocolType: protocolType
socket: self
errNo: _OFSocketErrNo()];
_canBlock = true;
#if SOCK_CLOEXEC == 0 && defined(HAVE_FCNTL_H) && defined(FD_CLOEXEC)
if ((flags = fcntl(_socket, F_GETFD, 0)) != -1)
fcntl(_socket, F_SETFD, flags | FD_CLOEXEC);
#endif
if (bind(_socket, (struct sockaddr *)&address.sockaddr,
address.length) != 0) {
int errNo = _OFSocketErrNo();
closesocket(_socket);
_socket = OFInvalidSocketHandle;
@throw [OFBindDDPSocketFailedException
exceptionWithNetwork: network
node: node
port: port
protocolType: protocolType
socket: self
errNo: errNo];
}
memset(&address, 0, sizeof(address));
address.family = OFSocketAddressFamilyAppleTalk;
address.length = (socklen_t)sizeof(address.sockaddr);
if (_OFGetSockName(_socket, (struct sockaddr *)&address.sockaddr,
&address.length) != 0) {
int errNo = _OFSocketErrNo();
closesocket(_socket);
_socket = OFInvalidSocketHandle;
@throw [OFBindDDPSocketFailedException
exceptionWithNetwork: network
node: node
port: port
protocolType: protocolType
socket: self
errNo: errNo];
}
if (address.sockaddr.at.sat_family != AF_APPLETALK) {
closesocket(_socket);
_socket = OFInvalidSocketHandle;
@throw [OFBindDDPSocketFailedException
exceptionWithNetwork: network
node: node
port: port
protocolType: protocolType
socket: self
errNo: EAFNOSUPPORT];
}
#ifdef OF_MACOS
if (setsockopt(_socket, ATPROTO_NONE, DDP_STRIPHDR, &one,
sizeof(one)) != 0 || ioctl(_socket, _IOWR('a', 2,
struct ATInterfaceConfig), &config) != 0)
@throw [OFBindDDPSocketFailedException
exceptionWithNetwork: network
node: node
port: port
protocolType: protocolType
socket: self
errNo: _OFSocketErrNo()];
OFSocketAddressSetAppleTalkNetwork(&address, config.address.s_net);
OFSocketAddressSetAppleTalkNode(&address, config.address.s_node);
#endif
#if !defined(OF_MACOS) && !defined(OF_WINDOWS)
_protocolType = protocolType;
#endif
return address;
}
/*
* Everybody but macOS and Windows is probably using a netatalk-compatible
* implementation, which includes the protocol type as the first byte of the
* data instead of considering it part of the header.
*
* The following overrides prepend the protocol type when sending and compare
* and strip it when receiving.
*
* Unfortunately, the downside of this is that the only way to handle receiving
* a packet with the wrong protocol type is to throw an exception with errNo
* ENOMSG, while macOS and Windows just filter those out in the kernel.
* Returning 0 would mean this is indistinguishable from an empty packet, so it
* has to be an exception.
*/
#if !defined(OF_MACOS) && !defined(OF_WINDOWS)
- (size_t)receiveIntoBuffer: (void *)buffer
length: (size_t)length
sender: (OFSocketAddress *)sender
{
ssize_t ret;
uint8_t protocolType;
struct iovec iov[2] = {
{ &protocolType, 1 },
{ buffer, length }
};
struct msghdr msg = {
.msg_name = (sender != NULL
? (struct sockaddr *)&sender->sockaddr : NULL),
.msg_namelen = (sender != NULL
? (socklen_t)sizeof(sender->sockaddr) : 0),
.msg_iov = iov,
.msg_iovlen = 2
};
if (_socket == OFInvalidSocketHandle)
@throw [OFNotOpenException exceptionWithObject: self];
if ((ret = recvmsg(_socket, &msg, 0)) < 0)
@throw [OFReadFailedException
exceptionWithObject: self
requestedLength: length
errNo: _OFSocketErrNo()];
if (ret < 1 || protocolType != _protocolType)
@throw [OFReadFailedException exceptionWithObject: self
requestedLength: length
errNo: ENOMSG];
if (sender != NULL) {
sender->length = msg.msg_namelen;
sender->family = OFSocketAddressFamilyAppleTalk;
}
return ret - 1;
}
- (void)sendBuffer: (const void *)buffer
length: (size_t)length
receiver: (const OFSocketAddress *)receiver
{
struct iovec iov[2] = {
{ &_protocolType, 1 },
{ (void *)buffer, length }
};
struct msghdr msg = {
.msg_name = (struct sockaddr *)&receiver->sockaddr,
.msg_namelen = receiver->length,
.msg_iov = iov,
.msg_iovlen = 2
};
ssize_t bytesWritten;
if (_socket == OFInvalidSocketHandle)
@throw [OFNotOpenException exceptionWithObject: self];
if ((bytesWritten = sendmsg(_socket, &msg, 0)) < 0)
@throw [OFWriteFailedException
exceptionWithObject: self
requestedLength: length
bytesWritten: 0
errNo: _OFSocketErrNo()];
if ((size_t)bytesWritten != length + 1) {
bytesWritten--;
if (bytesWritten < 0)
bytesWritten = 0;
@throw [OFWriteFailedException exceptionWithObject: self
requestedLength: length
bytesWritten: bytesWritten
errNo: 0];
}
}
#endif
@end