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socketmodule.c
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socketmodule.c
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/* Socket module */
/*
This module provides an interface to Berkeley socket IPC.
Limitations:
- Only AF_INET, AF_INET6 and AF_UNIX address families are supported in a
portable manner, though AF_PACKET, AF_NETLINK and AF_TIPC are supported
under Linux.
- No read/write operations (use sendall/recv or makefile instead).
- Additional restrictions apply on some non-Unix platforms (compensated
for by socket.py).
Module interface:
- socket.error: exception raised for socket specific errors
- socket.gaierror: exception raised for getaddrinfo/getnameinfo errors,
a subclass of socket.error
- socket.herror: exception raised for gethostby* errors,
a subclass of socket.error
- socket.gethostbyname(hostname) --> host IP address (string: 'dd.dd.dd.dd')
- socket.gethostbyaddr(IP address) --> (hostname, [alias, ...], [IP addr, ...])
- socket.gethostname() --> host name (string: 'spam' or 'spam.domain.com')
- socket.getprotobyname(protocolname) --> protocol number
- socket.getservbyname(servicename[, protocolname]) --> port number
- socket.getservbyport(portnumber[, protocolname]) --> service name
- socket.socket([family[, type [, proto, fileno]]]) --> new socket object
(fileno specifies a pre-existing socket file descriptor)
- socket.socketpair([family[, type [, proto]]]) --> (socket, socket)
- socket.ntohs(16 bit value) --> new int object
- socket.ntohl(32 bit value) --> new int object
- socket.htons(16 bit value) --> new int object
- socket.htonl(32 bit value) --> new int object
- socket.getaddrinfo(host, port [, family, socktype, proto, flags])
--> List of (family, socktype, proto, canonname, sockaddr)
- socket.getnameinfo(sockaddr, flags) --> (host, port)
- socket.AF_INET, socket.SOCK_STREAM, etc.: constants from <socket.h>
- socket.has_ipv6: boolean value indicating if IPv6 is supported
- socket.inet_aton(IP address) -> 32-bit packed IP representation
- socket.inet_ntoa(packed IP) -> IP address string
- socket.getdefaulttimeout() -> None | float
- socket.setdefaulttimeout(None | float)
- socket.if_nameindex() -> list of tuples (if_index, if_name)
- socket.if_nametoindex(name) -> corresponding interface index
- socket.if_indextoname(index) -> corresponding interface name
- an Internet socket address is a pair (hostname, port)
where hostname can be anything recognized by gethostbyname()
(including the dd.dd.dd.dd notation) and port is in host byte order
- where a hostname is returned, the dd.dd.dd.dd notation is used
- a UNIX domain socket address is a string specifying the pathname
- an AF_PACKET socket address is a tuple containing a string
specifying the ethernet interface and an integer specifying
the Ethernet protocol number to be received. For example:
("eth0",0x1234). Optional 3rd,4th,5th elements in the tuple
specify packet-type and ha-type/addr.
- an AF_TIPC socket address is expressed as
(addr_type, v1, v2, v3 [, scope]); where addr_type can be one of:
TIPC_ADDR_NAMESEQ, TIPC_ADDR_NAME, and TIPC_ADDR_ID;
and scope can be one of:
TIPC_ZONE_SCOPE, TIPC_CLUSTER_SCOPE, and TIPC_NODE_SCOPE.
The meaning of v1, v2 and v3 depends on the value of addr_type:
if addr_type is TIPC_ADDR_NAME:
v1 is the server type
v2 is the port identifier
v3 is ignored
if addr_type is TIPC_ADDR_NAMESEQ:
v1 is the server type
v2 is the lower port number
v3 is the upper port number
if addr_type is TIPC_ADDR_ID:
v1 is the node
v2 is the ref
v3 is ignored
Local naming conventions:
- names starting with sock_ are socket object methods
- names starting with socket_ are module-level functions
- names starting with PySocket are exported through socketmodule.h
*/
#ifdef __APPLE__
/*
* inet_aton is not available on OSX 10.3, yet we want to use a binary
* that was build on 10.4 or later to work on that release, weak linking
* comes to the rescue.
*/
# pragma weak inet_aton
#endif
#include "Python.h"
#include "structmember.h"
#undef MAX
#define MAX(x, y) ((x) < (y) ? (y) : (x))
/* Socket object documentation */
PyDoc_STRVAR(sock_doc,
"socket([family[, type[, proto]]]) -> socket object\n\
\n\
Open a socket of the given type. The family argument specifies the\n\
address family; it defaults to AF_INET. The type argument specifies\n\
whether this is a stream (SOCK_STREAM, this is the default)\n\
or datagram (SOCK_DGRAM) socket. The protocol argument defaults to 0,\n\
specifying the default protocol. Keyword arguments are accepted.\n\
\n\
A socket object represents one endpoint of a network connection.\n\
\n\
Methods of socket objects (keyword arguments not allowed):\n\
\n\
_accept() -- accept connection, returning new socket fd and client address\n\
bind(addr) -- bind the socket to a local address\n\
close() -- close the socket\n\
connect(addr) -- connect the socket to a remote address\n\
connect_ex(addr) -- connect, return an error code instead of an exception\n\
_dup() -- return a new socket fd duplicated from fileno()\n\
fileno() -- return underlying file descriptor\n\
getpeername() -- return remote address [*]\n\
getsockname() -- return local address\n\
getsockopt(level, optname[, buflen]) -- get socket options\n\
gettimeout() -- return timeout or None\n\
listen(n) -- start listening for incoming connections\n\
recv(buflen[, flags]) -- receive data\n\
recv_into(buffer[, nbytes[, flags]]) -- receive data (into a buffer)\n\
recvfrom(buflen[, flags]) -- receive data and sender\'s address\n\
recvfrom_into(buffer[, nbytes, [, flags])\n\
-- receive data and sender\'s address (into a buffer)\n\
sendall(data[, flags]) -- send all data\n\
send(data[, flags]) -- send data, may not send all of it\n\
sendto(data[, flags], addr) -- send data to a given address\n\
setblocking(0 | 1) -- set or clear the blocking I/O flag\n\
setsockopt(level, optname, value) -- set socket options\n\
settimeout(None | float) -- set or clear the timeout\n\
shutdown(how) -- shut down traffic in one or both directions\n\
if_nameindex() -- return all network interface indices and names\n\
if_nametoindex(name) -- return the corresponding interface index\n\
if_indextoname(index) -- return the corresponding interface name\n\
\n\
[*] not available on all platforms!");
/* XXX This is a terrible mess of platform-dependent preprocessor hacks.
I hope some day someone can clean this up please... */
/* Hacks for gethostbyname_r(). On some non-Linux platforms, the configure
script doesn't get this right, so we hardcode some platform checks below.
On the other hand, not all Linux versions agree, so there the settings
computed by the configure script are needed! */
#ifndef linux
# undef HAVE_GETHOSTBYNAME_R_3_ARG
# undef HAVE_GETHOSTBYNAME_R_5_ARG
# undef HAVE_GETHOSTBYNAME_R_6_ARG
#endif
#if defined(__OpenBSD__)
# include <sys/uio.h>
#endif
#ifndef WITH_THREAD
# undef HAVE_GETHOSTBYNAME_R
#endif
#ifdef HAVE_GETHOSTBYNAME_R
# if defined(_AIX)
# define HAVE_GETHOSTBYNAME_R_3_ARG
# elif defined(__sun) || defined(__sgi)
# define HAVE_GETHOSTBYNAME_R_5_ARG
# elif defined(linux)
/* Rely on the configure script */
# else
# undef HAVE_GETHOSTBYNAME_R
# endif
#endif
#if !defined(HAVE_GETHOSTBYNAME_R) && defined(WITH_THREAD) && \
!defined(MS_WINDOWS)
# define USE_GETHOSTBYNAME_LOCK
#endif
/* To use __FreeBSD_version */
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
/* On systems on which getaddrinfo() is believed to not be thread-safe,
(this includes the getaddrinfo emulation) protect access with a lock. */
#if defined(WITH_THREAD) && (defined(__APPLE__) || \
(defined(__FreeBSD__) && __FreeBSD_version+0 < 503000) || \
defined(__OpenBSD__) || defined(__NetBSD__) || \
defined(__VMS) || !defined(HAVE_GETADDRINFO))
#define USE_GETADDRINFO_LOCK
#endif
#ifdef USE_GETADDRINFO_LOCK
#define ACQUIRE_GETADDRINFO_LOCK PyThread_acquire_lock(netdb_lock, 1);
#define RELEASE_GETADDRINFO_LOCK PyThread_release_lock(netdb_lock);
#else
#define ACQUIRE_GETADDRINFO_LOCK
#define RELEASE_GETADDRINFO_LOCK
#endif
#if defined(USE_GETHOSTBYNAME_LOCK) || defined(USE_GETADDRINFO_LOCK)
# include "pythread.h"
#endif
#if defined(PYCC_VACPP)
# include <types.h>
# include <io.h>
# include <sys/ioctl.h>
# include <utils.h>
# include <ctype.h>
#endif
#if defined(__VMS)
# include <ioctl.h>
#endif
#if defined(PYOS_OS2)
# define INCL_DOS
# define INCL_DOSERRORS
# define INCL_NOPMAPI
# include <os2.h>
#endif
#if defined(__sgi) && _COMPILER_VERSION>700 && !_SGIAPI
/* make sure that the reentrant (gethostbyaddr_r etc)
functions are declared correctly if compiling with
MIPSPro 7.x in ANSI C mode (default) */
/* XXX Using _SGIAPI is the wrong thing,
but I don't know what the right thing is. */
#undef _SGIAPI /* to avoid warning */
#define _SGIAPI 1
#undef _XOPEN_SOURCE
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#ifdef _SS_ALIGNSIZE
#define HAVE_GETADDRINFO 1
#define HAVE_GETNAMEINFO 1
#endif
#define HAVE_INET_PTON
#include <netdb.h>
#endif
/* Irix 6.5 fails to define this variable at all. This is needed
for both GCC and SGI's compiler. I'd say that the SGI headers
are just busted. Same thing for Solaris. */
#if (defined(__sgi) || defined(sun)) && !defined(INET_ADDRSTRLEN)
#define INET_ADDRSTRLEN 16
#endif
/* Generic includes */
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
/* Generic socket object definitions and includes */
#define PySocket_BUILDING_SOCKET
#include "socketmodule.h"
/* Addressing includes */
#ifndef MS_WINDOWS
/* Non-MS WINDOWS includes */
# include <netdb.h>
# include <unistd.h>
/* Headers needed for inet_ntoa() and inet_addr() */
# if defined(PYOS_OS2) && defined(PYCC_VACPP)
# include <netdb.h>
typedef size_t socklen_t;
# else
# include <arpa/inet.h>
# endif
# include <fcntl.h>
#else
/* MS_WINDOWS includes */
# ifdef HAVE_FCNTL_H
# include <fcntl.h>
# endif
#endif
#include <stddef.h>
#ifndef offsetof
# define offsetof(type, member) ((size_t)(&((type *)0)->member))
#endif
#ifndef O_NONBLOCK
# define O_NONBLOCK O_NDELAY
#endif
/* include Python's addrinfo.h unless it causes trouble */
#if defined(__sgi) && _COMPILER_VERSION>700 && defined(_SS_ALIGNSIZE)
/* Do not include addinfo.h on some newer IRIX versions.
* _SS_ALIGNSIZE is defined in sys/socket.h by 6.5.21,
* for example, but not by 6.5.10.
*/
#elif defined(_MSC_VER) && _MSC_VER>1201
/* Do not include addrinfo.h for MSVC7 or greater. 'addrinfo' and
* EAI_* constants are defined in (the already included) ws2tcpip.h.
*/
#else
# include "addrinfo.h"
#endif
#ifndef HAVE_INET_PTON
#if !defined(NTDDI_VERSION) || (NTDDI_VERSION < NTDDI_LONGHORN)
int inet_pton(int af, const char *src, void *dst);
const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);
#endif
#endif
#ifdef __APPLE__
/* On OS X, getaddrinfo returns no error indication of lookup
failure, so we must use the emulation instead of the libinfo
implementation. Unfortunately, performing an autoconf test
for this bug would require DNS access for the machine performing
the configuration, which is not acceptable. Therefore, we
determine the bug just by checking for __APPLE__. If this bug
gets ever fixed, perhaps checking for sys/version.h would be
appropriate, which is 10/0 on the system with the bug. */
#ifndef HAVE_GETNAMEINFO
/* This bug seems to be fixed in Jaguar. Ths easiest way I could
Find to check for Jaguar is that it has getnameinfo(), which
older releases don't have */
#undef HAVE_GETADDRINFO
#endif
#ifdef HAVE_INET_ATON
#define USE_INET_ATON_WEAKLINK
#endif
#endif
/* I know this is a bad practice, but it is the easiest... */
#if !defined(HAVE_GETADDRINFO)
/* avoid clashes with the C library definition of the symbol. */
#define getaddrinfo fake_getaddrinfo
#define gai_strerror fake_gai_strerror
#define freeaddrinfo fake_freeaddrinfo
#include "getaddrinfo.c"
#endif
#if !defined(HAVE_GETNAMEINFO)
#define getnameinfo fake_getnameinfo
#include "getnameinfo.c"
#endif
#ifdef MS_WINDOWS
/* On Windows a socket is really a handle not an fd */
static SOCKET
dup_socket(SOCKET handle)
{
WSAPROTOCOL_INFO info;
if (WSADuplicateSocket(handle, GetCurrentProcessId(), &info))
return INVALID_SOCKET;
return WSASocket(FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO,
FROM_PROTOCOL_INFO, &info, 0, 0);
}
#define SOCKETCLOSE closesocket
#else
/* On Unix we can use dup to duplicate the file descriptor of a socket*/
#define dup_socket(fd) dup(fd)
#endif
#ifdef MS_WIN32
#define EAFNOSUPPORT WSAEAFNOSUPPORT
#define snprintf _snprintf
#endif
#if defined(PYOS_OS2) && !defined(PYCC_GCC)
#define SOCKETCLOSE soclose
#define NO_DUP /* Sockets are Not Actual File Handles under OS/2 */
#endif
#ifndef SOCKETCLOSE
#define SOCKETCLOSE close
#endif
#if (defined(HAVE_BLUETOOTH_H) || defined(HAVE_BLUETOOTH_BLUETOOTH_H)) && !defined(__NetBSD__) && !defined(__DragonFly__)
#define USE_BLUETOOTH 1
#if defined(__FreeBSD__)
#define BTPROTO_L2CAP BLUETOOTH_PROTO_L2CAP
#define BTPROTO_RFCOMM BLUETOOTH_PROTO_RFCOMM
#define BTPROTO_HCI BLUETOOTH_PROTO_HCI
#define SOL_HCI SOL_HCI_RAW
#define HCI_FILTER SO_HCI_RAW_FILTER
#define sockaddr_l2 sockaddr_l2cap
#define sockaddr_rc sockaddr_rfcomm
#define hci_dev hci_node
#define _BT_L2_MEMB(sa, memb) ((sa)->l2cap_##memb)
#define _BT_RC_MEMB(sa, memb) ((sa)->rfcomm_##memb)
#define _BT_HCI_MEMB(sa, memb) ((sa)->hci_##memb)
#elif defined(__NetBSD__) || defined(__DragonFly__)
#define sockaddr_l2 sockaddr_bt
#define sockaddr_rc sockaddr_bt
#define sockaddr_hci sockaddr_bt
#define sockaddr_sco sockaddr_bt
#define SOL_HCI BTPROTO_HCI
#define HCI_DATA_DIR SO_HCI_DIRECTION
#define _BT_L2_MEMB(sa, memb) ((sa)->bt_##memb)
#define _BT_RC_MEMB(sa, memb) ((sa)->bt_##memb)
#define _BT_HCI_MEMB(sa, memb) ((sa)->bt_##memb)
#define _BT_SCO_MEMB(sa, memb) ((sa)->bt_##memb)
#else
#define _BT_L2_MEMB(sa, memb) ((sa)->l2_##memb)
#define _BT_RC_MEMB(sa, memb) ((sa)->rc_##memb)
#define _BT_HCI_MEMB(sa, memb) ((sa)->hci_##memb)
#define _BT_SCO_MEMB(sa, memb) ((sa)->sco_##memb)
#endif
#endif
#ifdef __VMS
/* TCP/IP Services for VMS uses a maximum send/recv buffer length */
#define SEGMENT_SIZE (32 * 1024 -1)
#endif
#define SAS2SA(x) ((struct sockaddr *)(x))
/*
* Constants for getnameinfo()
*/
#if !defined(NI_MAXHOST)
#define NI_MAXHOST 1025
#endif
#if !defined(NI_MAXSERV)
#define NI_MAXSERV 32
#endif
#ifndef INVALID_SOCKET /* MS defines this */
#define INVALID_SOCKET (-1)
#endif
/* XXX There's a problem here: *static* functions are not supposed to have
a Py prefix (or use CapitalizedWords). Later... */
/* Global variable holding the exception type for errors detected
by this module (but not argument type or memory errors, etc.). */
static PyObject *socket_herror;
static PyObject *socket_gaierror;
static PyObject *socket_timeout;
/* A forward reference to the socket type object.
The sock_type variable contains pointers to various functions,
some of which call new_sockobject(), which uses sock_type, so
there has to be a circular reference. */
static PyTypeObject sock_type;
#if defined(HAVE_POLL_H)
#include <poll.h>
#elif defined(HAVE_SYS_POLL_H)
#include <sys/poll.h>
#endif
/* Largest value to try to store in a socklen_t (used when handling
ancillary data). POSIX requires socklen_t to hold at least
(2**31)-1 and recommends against storing larger values, but
socklen_t was originally int in the BSD interface, so to be on the
safe side we use the smaller of (2**31)-1 and INT_MAX. */
#if INT_MAX > 0x7fffffff
#define SOCKLEN_T_LIMIT 0x7fffffff
#else
#define SOCKLEN_T_LIMIT INT_MAX
#endif
#ifdef HAVE_POLL
/* Instead of select(), we'll use poll() since poll() works on any fd. */
#define IS_SELECTABLE(s) 1
/* Can we call select() with this socket without a buffer overrun? */
#else
/* If there's no timeout left, we don't have to call select, so it's a safe,
* little white lie. */
#define IS_SELECTABLE(s) (_PyIsSelectable_fd((s)->sock_fd) || (s)->sock_timeout <= 0.0)
#endif
static PyObject*
select_error(void)
{
PyErr_SetString(PyExc_OSError, "unable to select on socket");
return NULL;
}
#ifdef MS_WINDOWS
#ifndef WSAEAGAIN
#define WSAEAGAIN WSAEWOULDBLOCK
#endif
#define CHECK_ERRNO(expected) \
(WSAGetLastError() == WSA ## expected)
#else
#define CHECK_ERRNO(expected) \
(errno == expected)
#endif
/* Convenience function to raise an error according to errno
and return a NULL pointer from a function. */
static PyObject *
set_error(void)
{
#ifdef MS_WINDOWS
int err_no = WSAGetLastError();
/* PyErr_SetExcFromWindowsErr() invokes FormatMessage() which
recognizes the error codes used by both GetLastError() and
WSAGetLastError */
if (err_no)
return PyErr_SetExcFromWindowsErr(PyExc_OSError, err_no);
#endif
#if defined(PYOS_OS2) && !defined(PYCC_GCC)
if (sock_errno() != NO_ERROR) {
APIRET rc;
ULONG msglen;
char outbuf[100];
int myerrorcode = sock_errno();
/* Retrieve socket-related error message from MPTN.MSG file */
rc = DosGetMessage(NULL, 0, outbuf, sizeof(outbuf),
myerrorcode - SOCBASEERR + 26,
"mptn.msg",
&msglen);
if (rc == NO_ERROR) {
PyObject *v;
/* OS/2 doesn't guarantee a terminator */
outbuf[msglen] = '\0';
if (strlen(outbuf) > 0) {
/* If non-empty msg, trim CRLF */
char *lastc = &outbuf[ strlen(outbuf)-1 ];
while (lastc > outbuf &&
isspace(Py_CHARMASK(*lastc))) {
/* Trim trailing whitespace (CRLF) */
*lastc-- = '\0';
}
}
v = Py_BuildValue("(is)", myerrorcode, outbuf);
if (v != NULL) {
PyErr_SetObject(PyExc_OSError, v);
Py_DECREF(v);
}
return NULL;
}
}
#endif
return PyErr_SetFromErrno(PyExc_OSError);
}
static PyObject *
set_herror(int h_error)
{
PyObject *v;
#ifdef HAVE_HSTRERROR
v = Py_BuildValue("(is)", h_error, (char *)hstrerror(h_error));
#else
v = Py_BuildValue("(is)", h_error, "host not found");
#endif
if (v != NULL) {
PyErr_SetObject(socket_herror, v);
Py_DECREF(v);
}
return NULL;
}
static PyObject *
set_gaierror(int error)
{
PyObject *v;
#ifdef EAI_SYSTEM
/* EAI_SYSTEM is not available on Windows XP. */
if (error == EAI_SYSTEM)
return set_error();
#endif
#ifdef HAVE_GAI_STRERROR
v = Py_BuildValue("(is)", error, gai_strerror(error));
#else
v = Py_BuildValue("(is)", error, "getaddrinfo failed");
#endif
if (v != NULL) {
PyErr_SetObject(socket_gaierror, v);
Py_DECREF(v);
}
return NULL;
}
#ifdef __VMS
/* Function to send in segments */
static int
sendsegmented(int sock_fd, char *buf, int len, int flags)
{
int n = 0;
int remaining = len;
while (remaining > 0) {
unsigned int segment;
segment = (remaining >= SEGMENT_SIZE ? SEGMENT_SIZE : remaining);
n = send(sock_fd, buf, segment, flags);
if (n < 0) {
return n;
}
remaining -= segment;
buf += segment;
} /* end while */
return len;
}
#endif
/* Function to perform the setting of socket blocking mode
internally. block = (1 | 0). */
static int
internal_setblocking(PySocketSockObject *s, int block)
{
#ifndef MS_WINDOWS
int delay_flag;
#endif
#ifdef SOCK_NONBLOCK
if (block)
s->sock_type &= (~SOCK_NONBLOCK);
else
s->sock_type |= SOCK_NONBLOCK;
#endif
Py_BEGIN_ALLOW_THREADS
#ifndef MS_WINDOWS
#if defined(PYOS_OS2) && !defined(PYCC_GCC)
block = !block;
ioctl(s->sock_fd, FIONBIO, (caddr_t)&block, sizeof(block));
#elif defined(__VMS)
block = !block;
ioctl(s->sock_fd, FIONBIO, (unsigned int *)&block);
#else /* !PYOS_OS2 && !__VMS */
delay_flag = fcntl(s->sock_fd, F_GETFL, 0);
if (block)
delay_flag &= (~O_NONBLOCK);
else
delay_flag |= O_NONBLOCK;
fcntl(s->sock_fd, F_SETFL, delay_flag);
#endif /* !PYOS_OS2 */
#else /* MS_WINDOWS */
block = !block;
ioctlsocket(s->sock_fd, FIONBIO, (u_long*)&block);
#endif /* MS_WINDOWS */
Py_END_ALLOW_THREADS
/* Since these don't return anything */
return 1;
}
/* Do a select()/poll() on the socket, if necessary (sock_timeout > 0).
The argument writing indicates the direction.
This does not raise an exception; we'll let our caller do that
after they've reacquired the interpreter lock.
Returns 1 on timeout, -1 on error, 0 otherwise. */
static int
internal_select_ex(PySocketSockObject *s, int writing, double interval)
{
int n;
/* Nothing to do unless we're in timeout mode (not non-blocking) */
if (s->sock_timeout <= 0.0)
return 0;
/* Guard against closed socket */
if (s->sock_fd < 0)
return 0;
/* Handling this condition here simplifies the select loops */
if (interval < 0.0)
return 1;
/* Prefer poll, if available, since you can poll() any fd
* which can't be done with select(). */
#ifdef HAVE_POLL
{
struct pollfd pollfd;
int timeout;
pollfd.fd = s->sock_fd;
pollfd.events = writing ? POLLOUT : POLLIN;
/* s->sock_timeout is in seconds, timeout in ms */
timeout = (int)(interval * 1000 + 0.5);
n = poll(&pollfd, 1, timeout);
}
#else
{
/* Construct the arguments to select */
fd_set fds;
struct timeval tv;
tv.tv_sec = (int)interval;
tv.tv_usec = (int)((interval - tv.tv_sec) * 1e6);
FD_ZERO(&fds);
FD_SET(s->sock_fd, &fds);
/* See if the socket is ready */
if (writing)
n = select(Py_SAFE_DOWNCAST(s->sock_fd+1, SOCKET_T, int),
NULL, &fds, NULL, &tv);
else
n = select(Py_SAFE_DOWNCAST(s->sock_fd+1, SOCKET_T, int),
&fds, NULL, NULL, &tv);
}
#endif
if (n < 0)
return -1;
if (n == 0)
return 1;
return 0;
}
static int
internal_select(PySocketSockObject *s, int writing)
{
return internal_select_ex(s, writing, s->sock_timeout);
}
/*
Two macros for automatic retry of select() in case of false positives
(for example, select() could indicate a socket is ready for reading
but the data then discarded by the OS because of a wrong checksum).
Here is an example of use:
BEGIN_SELECT_LOOP(s)
Py_BEGIN_ALLOW_THREADS
timeout = internal_select_ex(s, 0, interval);
if (!timeout)
outlen = recv(s->sock_fd, cbuf, len, flags);
Py_END_ALLOW_THREADS
if (timeout == 1) {
PyErr_SetString(socket_timeout, "timed out");
return -1;
}
END_SELECT_LOOP(s)
*/
#define BEGIN_SELECT_LOOP(s) \
{ \
_PyTime_timeval now, deadline = {0, 0}; \
double interval = s->sock_timeout; \
int has_timeout = s->sock_timeout > 0.0; \
if (has_timeout) { \
_PyTime_gettimeofday(&now); \
deadline = now; \
_PyTime_ADD_SECONDS(deadline, s->sock_timeout); \
} \
while (1) { \
errno = 0; \
#define END_SELECT_LOOP(s) \
if (!has_timeout || \
(!CHECK_ERRNO(EWOULDBLOCK) && !CHECK_ERRNO(EAGAIN))) \
break; \
_PyTime_gettimeofday(&now); \
interval = _PyTime_INTERVAL(now, deadline); \
} \
} \
/* Initialize a new socket object. */
static double defaulttimeout = -1.0; /* Default timeout for new sockets */
static void
init_sockobject(PySocketSockObject *s,
SOCKET_T fd, int family, int type, int proto)
{
s->sock_fd = fd;
s->sock_family = family;
s->sock_type = type;
s->sock_proto = proto;
s->errorhandler = &set_error;
#ifdef SOCK_NONBLOCK
if (type & SOCK_NONBLOCK)
s->sock_timeout = 0.0;
else
#endif
{
s->sock_timeout = defaulttimeout;
if (defaulttimeout >= 0.0)
internal_setblocking(s, 0);
}
}
/* Create a new socket object.
This just creates the object and initializes it.
If the creation fails, return NULL and set an exception (implicit
in NEWOBJ()). */
static PySocketSockObject *
new_sockobject(SOCKET_T fd, int family, int type, int proto)
{
PySocketSockObject *s;
s = (PySocketSockObject *)
PyType_GenericNew(&sock_type, NULL, NULL);
if (s != NULL)
init_sockobject(s, fd, family, type, proto);
return s;
}
/* Lock to allow python interpreter to continue, but only allow one
thread to be in gethostbyname or getaddrinfo */
#if defined(USE_GETHOSTBYNAME_LOCK) || defined(USE_GETADDRINFO_LOCK)
PyThread_type_lock netdb_lock;
#endif
/* Convert a string specifying a host name or one of a few symbolic
names to a numeric IP address. This usually calls gethostbyname()
to do the work; the names "" and "<broadcast>" are special.
Return the length (IPv4 should be 4 bytes), or negative if
an error occurred; then an exception is raised. */
static int
setipaddr(char *name, struct sockaddr *addr_ret, size_t addr_ret_size, int af)
{
struct addrinfo hints, *res;
int error;
int d1, d2, d3, d4;
char ch;
memset((void *) addr_ret, '\0', sizeof(*addr_ret));
if (name[0] == '\0') {
int siz;
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_socktype = SOCK_DGRAM; /*dummy*/
hints.ai_flags = AI_PASSIVE;
Py_BEGIN_ALLOW_THREADS
ACQUIRE_GETADDRINFO_LOCK
error = getaddrinfo(NULL, "0", &hints, &res);
Py_END_ALLOW_THREADS
/* We assume that those thread-unsafe getaddrinfo() versions
*are* safe regarding their return value, ie. that a
subsequent call to getaddrinfo() does not destroy the
outcome of the first call. */
RELEASE_GETADDRINFO_LOCK
if (error) {
set_gaierror(error);
return -1;
}
switch (res->ai_family) {
case AF_INET:
siz = 4;
break;
#ifdef ENABLE_IPV6
case AF_INET6:
siz = 16;
break;
#endif
default:
freeaddrinfo(res);
PyErr_SetString(PyExc_OSError,
"unsupported address family");
return -1;
}
if (res->ai_next) {
freeaddrinfo(res);
PyErr_SetString(PyExc_OSError,
"wildcard resolved to multiple address");
return -1;
}
if (res->ai_addrlen < addr_ret_size)
addr_ret_size = res->ai_addrlen;
memcpy(addr_ret, res->ai_addr, addr_ret_size);
freeaddrinfo(res);
return siz;
}
if (name[0] == '<' && strcmp(name, "<broadcast>") == 0) {
struct sockaddr_in *sin;
if (af != AF_INET && af != AF_UNSPEC) {
PyErr_SetString(PyExc_OSError,
"address family mismatched");
return -1;
}
sin = (struct sockaddr_in *)addr_ret;
memset((void *) sin, '\0', sizeof(*sin));
sin->sin_family = AF_INET;
#ifdef HAVE_SOCKADDR_SA_LEN
sin->sin_len = sizeof(*sin);
#endif
sin->sin_addr.s_addr = INADDR_BROADCAST;
return sizeof(sin->sin_addr);
}
if (sscanf(name, "%d.%d.%d.%d%c", &d1, &d2, &d3, &d4, &ch) == 4 &&
0 <= d1 && d1 <= 255 && 0 <= d2 && d2 <= 255 &&
0 <= d3 && d3 <= 255 && 0 <= d4 && d4 <= 255) {
struct sockaddr_in *sin;
sin = (struct sockaddr_in *)addr_ret;
sin->sin_addr.s_addr = htonl(
((long) d1 << 24) | ((long) d2 << 16) |
((long) d3 << 8) | ((long) d4 << 0));
sin->sin_family = AF_INET;
#ifdef HAVE_SOCKADDR_SA_LEN
sin->sin_len = sizeof(*sin);
#endif
return 4;
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
Py_BEGIN_ALLOW_THREADS
ACQUIRE_GETADDRINFO_LOCK
error = getaddrinfo(name, NULL, &hints, &res);
#if defined(__digital__) && defined(__unix__)
if (error == EAI_NONAME && af == AF_UNSPEC) {
/* On Tru64 V5.1, numeric-to-addr conversion fails
if no address family is given. Assume IPv4 for now.*/
hints.ai_family = AF_INET;
error = getaddrinfo(name, NULL, &hints, &res);
}
#endif
Py_END_ALLOW_THREADS
RELEASE_GETADDRINFO_LOCK /* see comment in setipaddr() */
if (error) {
set_gaierror(error);
return -1;
}
if (res->ai_addrlen < addr_ret_size)
addr_ret_size = res->ai_addrlen;
memcpy((char *) addr_ret, res->ai_addr, addr_ret_size);
freeaddrinfo(res);
switch (addr_ret->sa_family) {
case AF_INET:
return 4;
#ifdef ENABLE_IPV6
case AF_INET6:
return 16;
#endif
default:
PyErr_SetString(PyExc_OSError, "unknown address family");
return -1;
}
}
/* Create a string object representing an IP address.
This is always a string of the form 'dd.dd.dd.dd' (with variable
size numbers). */
static PyObject *
makeipaddr(struct sockaddr *addr, int addrlen)
{
char buf[NI_MAXHOST];
int error;
error = getnameinfo(addr, addrlen, buf, sizeof(buf), NULL, 0,
NI_NUMERICHOST);
if (error) {
set_gaierror(error);
return NULL;
}
return PyUnicode_FromString(buf);
}
#ifdef USE_BLUETOOTH
/* Convert a string representation of a Bluetooth address into a numeric
address. Returns the length (6), or raises an exception and returns -1 if
an error occurred. */
static int
setbdaddr(char *name, bdaddr_t *bdaddr)
{
unsigned int b0, b1, b2, b3, b4, b5;
char ch;
int n;
n = sscanf(name, "%X:%X:%X:%X:%X:%X%c",