mirror of
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255 lines
6.2 KiB
C
255 lines
6.2 KiB
C
/* Socket module header file */
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/* Includes needed for the sockaddr_* symbols below */
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#ifndef MS_WINDOWS
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#ifdef __VMS
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# include <socket.h>
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# else
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# include <sys/socket.h>
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# endif
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# include <netinet/in.h>
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# if defined(__CYGWIN__) || (defined(PYOS_OS2) && defined(PYCC_VACPP))
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# include <netinet/tcp.h>
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# endif
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#else /* MS_WINDOWS */
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#if _MSC_VER >= 1300
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# include <winsock2.h>
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# include <ws2tcpip.h>
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# define HAVE_ADDRINFO
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# define HAVE_SOCKADDR_STORAGE
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# define HAVE_GETADDRINFO
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# define HAVE_GETNAMEINFO
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# define ENABLE_IPV6
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#else
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# include <winsock.h>
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#endif
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#endif
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#ifdef HAVE_SYS_UN_H
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# include <sys/un.h>
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#else
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# undef AF_UNIX
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#endif
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#ifdef HAVE_LINUX_NETLINK_H
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# ifdef HAVE_ASM_TYPES_H
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# include <asm/types.h>
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# endif
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# include <linux/netlink.h>
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#else
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# undef AF_NETLINK
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#endif
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#ifdef HAVE_BLUETOOTH_BLUETOOTH_H
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#include <bluetooth/bluetooth.h>
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#include <bluetooth/rfcomm.h>
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#include <bluetooth/l2cap.h>
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#include <bluetooth/sco.h>
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#include <bluetooth/hci.h>
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#endif
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#ifdef HAVE_BLUETOOTH_H
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#include <bluetooth.h>
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#endif
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#ifdef HAVE_NETPACKET_PACKET_H
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# include <sys/ioctl.h>
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# include <net/if.h>
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# include <netpacket/packet.h>
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#endif
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#ifndef Py__SOCKET_H
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#define Py__SOCKET_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Python module and C API name */
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#define PySocket_MODULE_NAME "_socket"
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#define PySocket_CAPI_NAME "CAPI"
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/* Abstract the socket file descriptor type */
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#ifdef MS_WINDOWS
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typedef SOCKET SOCKET_T;
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# ifdef MS_WIN64
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# define SIZEOF_SOCKET_T 8
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# else
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# define SIZEOF_SOCKET_T 4
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# endif
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#else
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typedef int SOCKET_T;
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# define SIZEOF_SOCKET_T SIZEOF_INT
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#endif
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/* Socket address */
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typedef union sock_addr {
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struct sockaddr_in in;
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#ifdef AF_UNIX
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struct sockaddr_un un;
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#endif
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#ifdef AF_NETLINK
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struct sockaddr_nl nl;
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#endif
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#ifdef ENABLE_IPV6
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struct sockaddr_in6 in6;
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struct sockaddr_storage storage;
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#endif
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#ifdef HAVE_BLUETOOTH_BLUETOOTH_H
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struct sockaddr_l2 bt_l2;
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struct sockaddr_rc bt_rc;
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struct sockaddr_sco bt_sco;
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struct sockaddr_hci bt_hci;
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#endif
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#ifdef HAVE_NETPACKET_PACKET_H
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struct sockaddr_ll ll;
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#endif
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} sock_addr_t;
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/* The object holding a socket. It holds some extra information,
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like the address family, which is used to decode socket address
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arguments properly. */
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typedef struct {
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PyObject_HEAD
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SOCKET_T sock_fd; /* Socket file descriptor */
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int sock_family; /* Address family, e.g., AF_INET */
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int sock_type; /* Socket type, e.g., SOCK_STREAM */
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int sock_proto; /* Protocol type, usually 0 */
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PyObject *(*errorhandler)(void); /* Error handler; checks
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errno, returns NULL and
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sets a Python exception */
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double sock_timeout; /* Operation timeout in seconds;
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0.0 means non-blocking */
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} PySocketSockObject;
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/* --- C API ----------------------------------------------------*/
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/* Short explanation of what this C API export mechanism does
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and how it works:
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The _ssl module needs access to the type object defined in
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the _socket module. Since cross-DLL linking introduces a lot of
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problems on many platforms, the "trick" is to wrap the
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C API of a module in a struct which then gets exported to
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other modules via a PyCObject.
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The code in socketmodule.c defines this struct (which currently
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only contains the type object reference, but could very
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well also include other C APIs needed by other modules)
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and exports it as PyCObject via the module dictionary
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under the name "CAPI".
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Other modules can now include the socketmodule.h file
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which defines the needed C APIs to import and set up
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a static copy of this struct in the importing module.
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After initialization, the importing module can then
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access the C APIs from the _socket module by simply
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referring to the static struct, e.g.
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Load _socket module and its C API; this sets up the global
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PySocketModule:
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if (PySocketModule_ImportModuleAndAPI())
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return;
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Now use the C API as if it were defined in the using
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module:
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if (!PyArg_ParseTuple(args, "O!|zz:ssl",
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PySocketModule.Sock_Type,
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(PyObject*)&Sock,
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&key_file, &cert_file))
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return NULL;
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Support could easily be extended to export more C APIs/symbols
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this way. Currently, only the type object is exported,
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other candidates would be socket constructors and socket
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access functions.
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*/
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/* C API for usage by other Python modules */
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typedef struct {
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PyTypeObject *Sock_Type;
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PyObject *error;
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} PySocketModule_APIObject;
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/* XXX The net effect of the following appears to be to define a function
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XXX named PySocketModule_APIObject in _ssl.c. It's unclear why it isn't
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XXX defined there directly.
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>>> It's defined here because other modules might also want to use
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>>> the C API.
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*/
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#ifndef PySocket_BUILDING_SOCKET
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/* --- C API ----------------------------------------------------*/
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/* Interfacestructure to C API for other modules.
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Call PySocketModule_ImportModuleAndAPI() to initialize this
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structure. After that usage is simple:
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if (!PyArg_ParseTuple(args, "O!|zz:ssl",
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&PySocketModule.Sock_Type, (PyObject*)&Sock,
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&key_file, &cert_file))
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return NULL;
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...
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*/
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static
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PySocketModule_APIObject PySocketModule;
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/* You *must* call this before using any of the functions in
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PySocketModule and check its outcome; otherwise all accesses will
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result in a segfault. Returns 0 on success. */
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#ifndef DPRINTF
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# define DPRINTF if (0) printf
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#endif
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static
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int PySocketModule_ImportModuleAndAPI(void)
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{
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PyObject *mod = 0, *v = 0;
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char *apimodule = PySocket_MODULE_NAME;
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char *apiname = PySocket_CAPI_NAME;
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void *api;
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DPRINTF("Importing the %s C API...\n", apimodule);
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mod = PyImport_ImportModule(apimodule);
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if (mod == NULL)
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goto onError;
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DPRINTF(" %s package found\n", apimodule);
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v = PyObject_GetAttrString(mod, apiname);
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if (v == NULL)
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goto onError;
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Py_DECREF(mod);
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DPRINTF(" API object %s found\n", apiname);
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api = PyCObject_AsVoidPtr(v);
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if (api == NULL)
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goto onError;
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Py_DECREF(v);
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memcpy(&PySocketModule, api, sizeof(PySocketModule));
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DPRINTF(" API object loaded and initialized.\n");
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return 0;
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onError:
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DPRINTF(" not found.\n");
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Py_XDECREF(mod);
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Py_XDECREF(v);
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return -1;
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}
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#endif /* !PySocket_BUILDING_SOCKET */
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py__SOCKET_H */
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