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cpython/Modules/socketmodule.h
Erlend Egeberg Aasland f22b7ca1af
bpo-41798: Allocate _socket module C API on the heap (GH-24126)
2021-01-06 20:43:06 +01:00

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/* Socket module header file */
/* Includes needed for the sockaddr_* symbols below */
#ifndef MS_WINDOWS
#ifdef __VMS
# include <socket.h>
# else
# include <sys/socket.h>
# endif
# include <netinet/in.h>
# if !defined(__CYGWIN__)
# include <netinet/tcp.h>
# endif
#else /* MS_WINDOWS */
# include <winsock2.h>
/*
* If Windows has bluetooth support, include bluetooth constants.
*/
#ifdef AF_BTH
# include <ws2bth.h>
# include <pshpack1.h>
/*
* The current implementation assumes the bdaddr in the sockaddr structs
* will be a bdaddr_t. We treat this as an opaque type: on *nix systems, it
* will be a struct with a single member (an array of six bytes). On windows,
* we typedef this to ULONGLONG to match the Windows definition.
*/
typedef ULONGLONG bdaddr_t;
/*
* Redefine SOCKADDR_BTH to provide names compatible with _BT_RC_MEMB() macros.
*/
struct SOCKADDR_BTH_REDEF {
union {
USHORT addressFamily;
USHORT family;
};
union {
ULONGLONG btAddr;
bdaddr_t bdaddr;
};
GUID serviceClassId;
union {
ULONG port;
ULONG channel;
};
};
# include <poppack.h>
#endif
/* Windows 'supports' CMSG_LEN, but does not follow the POSIX standard
* interface at all, so there is no point including the code that
* attempts to use it.
*/
# ifdef PySocket_BUILDING_SOCKET
# undef CMSG_LEN
# endif
# include <ws2tcpip.h>
/* VC6 is shipped with old platform headers, and does not have MSTcpIP.h
* Separate SDKs have all the functions we want, but older ones don't have
* any version information.
* I use SIO_GET_MULTICAST_FILTER to detect a decent SDK.
*/
# ifdef SIO_GET_MULTICAST_FILTER
# include <mstcpip.h> /* for SIO_RCVALL */
# define HAVE_ADDRINFO
# define HAVE_SOCKADDR_STORAGE
# define HAVE_GETADDRINFO
# define HAVE_GETNAMEINFO
# define ENABLE_IPV6
# else
typedef int socklen_t;
# endif /* IPPROTO_IPV6 */
#endif /* MS_WINDOWS */
#ifdef HAVE_SYS_UN_H
# include <sys/un.h>
#else
# undef AF_UNIX
#endif
#ifdef HAVE_LINUX_NETLINK_H
# ifdef HAVE_ASM_TYPES_H
# include <asm/types.h>
# endif
# include <linux/netlink.h>
#else
# undef AF_NETLINK
#endif
#ifdef HAVE_LINUX_QRTR_H
# ifdef HAVE_ASM_TYPES_H
# include <asm/types.h>
# endif
# include <linux/qrtr.h>
#else
# undef AF_QIPCRTR
#endif
#ifdef HAVE_BLUETOOTH_BLUETOOTH_H
#include <bluetooth/bluetooth.h>
#include <bluetooth/rfcomm.h>
#include <bluetooth/l2cap.h>
#include <bluetooth/sco.h>
#include <bluetooth/hci.h>
#endif
#ifdef HAVE_BLUETOOTH_H
#include <bluetooth.h>
#endif
#ifdef HAVE_NET_IF_H
# include <net/if.h>
#endif
#ifdef HAVE_NETPACKET_PACKET_H
# include <sys/ioctl.h>
# include <netpacket/packet.h>
#endif
#ifdef HAVE_LINUX_TIPC_H
# include <linux/tipc.h>
#endif
#ifdef HAVE_LINUX_CAN_H
# include <linux/can.h>
#else
# undef AF_CAN
# undef PF_CAN
#endif
#ifdef HAVE_LINUX_CAN_RAW_H
#include <linux/can/raw.h>
#endif
#ifdef HAVE_LINUX_CAN_BCM_H
#include <linux/can/bcm.h>
#endif
#ifdef HAVE_LINUX_CAN_J1939_H
#include <linux/can/j1939.h>
#endif
#ifdef HAVE_SYS_SYS_DOMAIN_H
#include <sys/sys_domain.h>
#endif
#ifdef HAVE_SYS_KERN_CONTROL_H
#include <sys/kern_control.h>
#endif
#ifdef HAVE_LINUX_VM_SOCKETS_H
# include <linux/vm_sockets.h>
#else
# undef AF_VSOCK
#endif
#ifdef HAVE_SOCKADDR_ALG
# include <linux/if_alg.h>
# ifndef AF_ALG
# define AF_ALG 38
# endif
# ifndef SOL_ALG
# define SOL_ALG 279
# endif
/* Linux 3.19 */
# ifndef ALG_SET_AEAD_ASSOCLEN
# define ALG_SET_AEAD_ASSOCLEN 4
# endif
# ifndef ALG_SET_AEAD_AUTHSIZE
# define ALG_SET_AEAD_AUTHSIZE 5
# endif
/* Linux 4.8 */
# ifndef ALG_SET_PUBKEY
# define ALG_SET_PUBKEY 6
# endif
# ifndef ALG_OP_SIGN
# define ALG_OP_SIGN 2
# endif
# ifndef ALG_OP_VERIFY
# define ALG_OP_VERIFY 3
# endif
#endif /* HAVE_SOCKADDR_ALG */
#ifndef Py__SOCKET_H
#define Py__SOCKET_H
#ifdef __cplusplus
extern "C" {
#endif
/* Python module and C API name */
#define PySocket_MODULE_NAME "_socket"
#define PySocket_CAPI_NAME "CAPI"
#define PySocket_CAPSULE_NAME PySocket_MODULE_NAME "." PySocket_CAPI_NAME
/* Abstract the socket file descriptor type */
#ifdef MS_WINDOWS
typedef SOCKET SOCKET_T;
# ifdef MS_WIN64
# define SIZEOF_SOCKET_T 8
# else
# define SIZEOF_SOCKET_T 4
# endif
#else
typedef int SOCKET_T;
# define SIZEOF_SOCKET_T SIZEOF_INT
#endif
#if SIZEOF_SOCKET_T <= SIZEOF_LONG
#define PyLong_FromSocket_t(fd) PyLong_FromLong((SOCKET_T)(fd))
#define PyLong_AsSocket_t(fd) (SOCKET_T)PyLong_AsLong(fd)
#else
#define PyLong_FromSocket_t(fd) PyLong_FromLongLong((SOCKET_T)(fd))
#define PyLong_AsSocket_t(fd) (SOCKET_T)PyLong_AsLongLong(fd)
#endif
/* Socket address */
typedef union sock_addr {
struct sockaddr_in in;
struct sockaddr sa;
#ifdef AF_UNIX
struct sockaddr_un un;
#endif
#ifdef AF_NETLINK
struct sockaddr_nl nl;
#endif
#ifdef ENABLE_IPV6
struct sockaddr_in6 in6;
struct sockaddr_storage storage;
#endif
#if defined(HAVE_BLUETOOTH_H) && defined(__FreeBSD__)
struct sockaddr_l2cap bt_l2;
struct sockaddr_rfcomm bt_rc;
struct sockaddr_sco bt_sco;
struct sockaddr_hci bt_hci;
#elif defined(HAVE_BLUETOOTH_BLUETOOTH_H)
struct sockaddr_l2 bt_l2;
struct sockaddr_rc bt_rc;
struct sockaddr_sco bt_sco;
struct sockaddr_hci bt_hci;
#elif defined(MS_WINDOWS)
struct SOCKADDR_BTH_REDEF bt_rc;
#endif
#ifdef HAVE_NETPACKET_PACKET_H
struct sockaddr_ll ll;
#endif
#ifdef HAVE_LINUX_CAN_H
struct sockaddr_can can;
#endif
#ifdef HAVE_SYS_KERN_CONTROL_H
struct sockaddr_ctl ctl;
#endif
#ifdef HAVE_SOCKADDR_ALG
struct sockaddr_alg alg;
#endif
#ifdef AF_QIPCRTR
struct sockaddr_qrtr sq;
#endif
#ifdef AF_VSOCK
struct sockaddr_vm vm;
#endif
#ifdef HAVE_LINUX_TIPC_H
struct sockaddr_tipc tipc;
#endif
} sock_addr_t;
/* The object holding a socket. It holds some extra information,
like the address family, which is used to decode socket address
arguments properly. */
typedef struct {
PyObject_HEAD
SOCKET_T sock_fd; /* Socket file descriptor */
int sock_family; /* Address family, e.g., AF_INET */
int sock_type; /* Socket type, e.g., SOCK_STREAM */
int sock_proto; /* Protocol type, usually 0 */
PyObject *(*errorhandler)(void); /* Error handler; checks
errno, returns NULL and
sets a Python exception */
_PyTime_t sock_timeout; /* Operation timeout in seconds;
0.0 means non-blocking */
} PySocketSockObject;
/* --- C API ----------------------------------------------------*/
/* Short explanation of what this C API export mechanism does
and how it works:
The _ssl module needs access to the type object defined in
the _socket module. Since cross-DLL linking introduces a lot of
problems on many platforms, the "trick" is to wrap the
C API of a module in a struct which then gets exported to
other modules via a PyCapsule.
The code in socketmodule.c defines this struct (which currently
only contains the type object reference, but could very
well also include other C APIs needed by other modules)
and exports it as PyCapsule via the module dictionary
under the name "CAPI".
Other modules can now include the socketmodule.h file
which defines the needed C APIs to import and set up
a static copy of this struct in the importing module.
After initialization, the importing module can then
access the C APIs from the _socket module by simply
referring to the static struct, e.g.
Load _socket module and its C API; this sets up the global
PySocketModule:
if (PySocketModule_ImportModuleAndAPI())
return;
Now use the C API as if it were defined in the using
module:
if (!PyArg_ParseTuple(args, "O!|zz:ssl",
PySocketModule.Sock_Type,
(PyObject*)&Sock,
&key_file, &cert_file))
return NULL;
Support could easily be extended to export more C APIs/symbols
this way. Currently, only the type object is exported,
other candidates would be socket constructors and socket
access functions.
*/
/* C API for usage by other Python modules.
* Always add new things to the end for binary compatibility. */
typedef struct {
PyTypeObject *Sock_Type;
PyObject *error;
PyObject *timeout_error;
} PySocketModule_APIObject;
#define PySocketModule_ImportModuleAndAPI() PyCapsule_Import(PySocket_CAPSULE_NAME, 1)
#ifdef __cplusplus
}
#endif
#endif /* !Py__SOCKET_H */
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