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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 is 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.fromfd(fd, family, type[, proto]) --> new socket object (created
from an existing file descriptor)
- 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]]]) --> new socket object
- 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)
- 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.
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
*/
#include "Python.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 a connection, returning new socket 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 object identical to the current one [*]\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\
makefile([mode, [bufsize]]) -- return a file object for the socket [*]\n\
recv(buflen[, flags]) -- receive data\n\
recvfrom(buflen[, flags]) -- receive data and sender's address\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\
\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
#ifndef WITH_THREAD
# undef HAVE_GETHOSTBYNAME_R
#endif
#ifdef HAVE_GETHOSTBYNAME_R
# if defined(_AIX) || defined(__osf__)
# 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(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)
#if ! defined(_SOCKADDR_LEN)
# ifdef getaddrinfo
# undef getaddrinfo
# endif
# include "TCPIP_IOCTL_ROUTINE"
#else
# include <ioctl.h>
#endif
#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. */
#if defined(__sgi) && !defined(INET_ADDRSTRLEN)
#define INET_ADDRSTRLEN 16
#endif
/* Generic includes */
#include <sys/types.h>
/* 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>
/* Headers needed for inet_ntoa() and inet_addr() */
# ifdef __BEOS__
# include <net/netdb.h>
# elif defined(PYOS_OS2) && defined(PYCC_VACPP)
# include <netdb.h>
typedef size_t socklen_t;
# else
# include <arpa/inet.h>
# endif
# ifndef RISCOS
# include <fcntl.h>
# else
# include <sys/ioctl.h>
# include <socklib.h>
# define NO_DUP
int h_errno; /* not used */
# define INET_ADDRSTRLEN 16
# endif
#else
/* MS_WINDOWS includes */
# include <fcntl.h>
#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>1200
/* 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
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
#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
#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
#if defined(MS_WINDOWS) || defined(__BEOS__)
/* BeOS suffers from the same socket dichotomy as Win32... - [cjh] */
/* seem to be a few differences in the API */
#define SOCKETCLOSE closesocket
#define NO_DUP /* Actually it exists on NT 3.5, but what the heck... */
#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
#ifdef __VMS
/* TCP/IP Services for VMS uses a maximum send/revc buffer length of 65535 */
#define SEGMENT_SIZE 65535
#endif
#if defined(HAVE_BLUETOOTH_H) || defined(HAVE_BLUETOOTH_BLUETOOTH_H)
#define USE_BLUETOOTH 1
#if defined(__FreeBSD__)
#define BTPROTO_L2CAP BLUETOOTH_PROTO_L2CAP
#define BTPROTO_RFCOMM BLUETOOTH_PROTO_RFCOMM
#define sockaddr_l2 sockaddr_l2cap
#define sockaddr_rc sockaddr_rfcomm
#define _BT_SOCKADDR_MEMB(s, proto) &((s)->sock_addr)
#define _BT_L2_MEMB(sa, memb) ((sa)->l2cap_##memb)
#define _BT_RC_MEMB(sa, memb) ((sa)->rfcomm_##memb)
#else
#define _BT_SOCKADDR_MEMB(s, proto) (&((s)->sock_addr).bt_##proto)
#define _BT_L2_MEMB(sa, memb) ((sa)->l2_##memb)
#define _BT_RC_MEMB(sa, memb) ((sa)->rc_##memb)
#define _BT_SCO_MEMB(sa, memb) ((sa)->sco_##memb)
#endif
#endif
/*
* Constants for getnameinfo()
*/
#if !defined(NI_MAXHOST)
#define NI_MAXHOST 1025
#endif
#if !defined(NI_MAXSERV)
#define NI_MAXSERV 32
#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_error;
static PyObject *socket_herror;
static PyObject *socket_gaierror;
static PyObject *socket_timeout;
#ifdef RISCOS
/* Global variable which is !=0 if Python is running in a RISC OS taskwindow */
static int taskwindow;
#endif
/* 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;
/* 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();
static struct {
int no;
const char *msg;
} *msgp, msgs[] = {
{WSAEINTR, "Interrupted system call"},
{WSAEBADF, "Bad file descriptor"},
{WSAEACCES, "Permission denied"},
{WSAEFAULT, "Bad address"},
{WSAEINVAL, "Invalid argument"},
{WSAEMFILE, "Too many open files"},
{WSAEWOULDBLOCK,
"The socket operation could not complete "
"without blocking"},
{WSAEINPROGRESS, "Operation now in progress"},
{WSAEALREADY, "Operation already in progress"},
{WSAENOTSOCK, "Socket operation on non-socket"},
{WSAEDESTADDRREQ, "Destination address required"},
{WSAEMSGSIZE, "Message too long"},
{WSAEPROTOTYPE, "Protocol wrong type for socket"},
{WSAENOPROTOOPT, "Protocol not available"},
{WSAEPROTONOSUPPORT, "Protocol not supported"},
{WSAESOCKTNOSUPPORT, "Socket type not supported"},
{WSAEOPNOTSUPP, "Operation not supported"},
{WSAEPFNOSUPPORT, "Protocol family not supported"},
{WSAEAFNOSUPPORT, "Address family not supported"},
{WSAEADDRINUSE, "Address already in use"},
{WSAEADDRNOTAVAIL, "Can't assign requested address"},
{WSAENETDOWN, "Network is down"},
{WSAENETUNREACH, "Network is unreachable"},
{WSAENETRESET, "Network dropped connection on reset"},
{WSAECONNABORTED, "Software caused connection abort"},
{WSAECONNRESET, "Connection reset by peer"},
{WSAENOBUFS, "No buffer space available"},
{WSAEISCONN, "Socket is already connected"},
{WSAENOTCONN, "Socket is not connected"},
{WSAESHUTDOWN, "Can't send after socket shutdown"},
{WSAETOOMANYREFS, "Too many references: can't splice"},
{WSAETIMEDOUT, "Operation timed out"},
{WSAECONNREFUSED, "Connection refused"},
{WSAELOOP, "Too many levels of symbolic links"},
{WSAENAMETOOLONG, "File name too long"},
{WSAEHOSTDOWN, "Host is down"},
{WSAEHOSTUNREACH, "No route to host"},
{WSAENOTEMPTY, "Directory not empty"},
{WSAEPROCLIM, "Too many processes"},
{WSAEUSERS, "Too many users"},
{WSAEDQUOT, "Disc quota exceeded"},
{WSAESTALE, "Stale NFS file handle"},
{WSAEREMOTE, "Too many levels of remote in path"},
{WSASYSNOTREADY, "Network subsystem is unvailable"},
{WSAVERNOTSUPPORTED, "WinSock version is not supported"},
{WSANOTINITIALISED,
"Successful WSAStartup() not yet performed"},
{WSAEDISCON, "Graceful shutdown in progress"},
/* Resolver errors */
{WSAHOST_NOT_FOUND, "No such host is known"},
{WSATRY_AGAIN, "Host not found, or server failed"},
{WSANO_RECOVERY, "Unexpected server error encountered"},
{WSANO_DATA, "Valid name without requested data"},
{WSANO_ADDRESS, "No address, look for MX record"},
{0, NULL}
};
if (err_no) {
PyObject *v;
const char *msg = "winsock error";
for (msgp = msgs; msgp->msg; msgp++) {
if (err_no == msgp->no) {
msg = msgp->msg;
break;
}
}
v = Py_BuildValue("(is)", err_no, msg);
if (v != NULL) {
PyErr_SetObject(socket_error, v);
Py_DECREF(v);
}
return NULL;
}
else
#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(*lastc)) {
/* Trim trailing whitespace (CRLF) */
*lastc-- = '\0';
}
}
v = Py_BuildValue("(is)", myerrorcode, outbuf);
if (v != NULL) {
PyErr_SetObject(socket_error, v);
Py_DECREF(v);
}
return NULL;
}
}
#endif
#if defined(RISCOS)
if (_inet_error.errnum != NULL) {
PyObject *v;
v = Py_BuildValue("(is)", errno, _inet_err());
if (v != NULL) {
PyErr_SetObject(socket_error, v);
Py_DECREF(v);
}
return NULL;
}
#endif
return PyErr_SetFromErrno(socket_error);
}
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;
}
/* Function to perform the setting of socket blocking mode
internally. block = (1 | 0). */
static int
internal_setblocking(PySocketSockObject *s, int block)
{
#ifndef RISCOS
#ifndef MS_WINDOWS
int delay_flag;
#endif
#endif
Py_BEGIN_ALLOW_THREADS
#ifdef __BEOS__
block = !block;
setsockopt(s->sock_fd, SOL_SOCKET, SO_NONBLOCK,
(void *)(&block), sizeof(int));
#else
#ifndef RISCOS
#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, (char *)&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 */
#else /* RISCOS */
block = !block;
socketioctl(s->sock_fd, FIONBIO, (u_long*)&block);
#endif /* RISCOS */
#endif /* __BEOS__ */
Py_END_ALLOW_THREADS
/* Since these don't return anything */
return 1;
}
/* Do a select() 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, 0 otherwise. */
static int
internal_select(PySocketSockObject *s, int writing)
{
fd_set fds;
struct timeval tv;
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;
/* Construct the arguments to select */
tv.tv_sec = (int)s->sock_timeout;
tv.tv_usec = (int)((s->sock_timeout - tv.tv_sec) * 1e6);
FD_ZERO(&fds);
FD_SET(s->sock_fd, &fds);
/* See if the socket is ready */
if (writing)
n = select(s->sock_fd+1, NULL, &fds, NULL, &tv);
else
n = select(s->sock_fd+1, &fds, NULL, NULL, &tv);
if (n == 0)
return 1;
return 0;
}
/* Initialize a new socket object. */
static double defaulttimeout = -1.0; /* Default timeout for new sockets */
PyMODINIT_FUNC
init_sockobject(PySocketSockObject *s,
SOCKET_T fd, int family, int type, int proto)
{
#ifdef RISCOS
int block = 1;
#endif
s->sock_fd = fd;
s->sock_family = family;
s->sock_type = type;
s->sock_proto = proto;
s->sock_timeout = defaulttimeout;
s->errorhandler = &set_error;
if (defaulttimeout >= 0.0)
internal_setblocking(s, 0);
#ifdef RISCOS
if (taskwindow)
socketioctl(s->sock_fd, 0x80046679, (u_long*)&block);
#endif
}
/* 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(socket_error,
"unsupported address family");
return -1;
}
if (res->ai_next) {
freeaddrinfo(res);
PyErr_SetString(socket_error,
"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(socket_error,
"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(socket_error, "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 PyString_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",
&b5, &b4, &b3, &b2, &b1, &b0, &ch);
if (n == 6 && (b0 | b1 | b2 | b3 | b4 | b5) < 256) {
bdaddr->b[0] = b0;
bdaddr->b[1] = b1;
bdaddr->b[2] = b2;
bdaddr->b[3] = b3;
bdaddr->b[4] = b4;
bdaddr->b[5] = b5;
return 6;
} else {
PyErr_SetString(socket_error, "bad bluetooth address");
return -1;
}
}
/* Create a string representation of the Bluetooth address. This is always a
string of the form 'XX:XX:XX:XX:XX:XX' where XX is a two digit hexadecimal
value (zero padded if necessary). */
static PyObject *
makebdaddr(bdaddr_t *bdaddr)
{
char buf[(6 * 2) + 5 + 1];
sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
bdaddr->b[5], bdaddr->b[4], bdaddr->b[3],
bdaddr->b[2], bdaddr->b[1], bdaddr->b[0]);
return PyString_FromString(buf);
}
#endif
/* Create an object representing the given socket address,
suitable for passing it back to bind(), connect() etc.
The family field of the sockaddr structure is inspected
to determine what kind of address it really is. */
/*ARGSUSED*/
static PyObject *
makesockaddr(int sockfd, struct sockaddr *addr, int addrlen, int proto)
{
if (addrlen == 0) {
/* No address -- may be recvfrom() from known socket */
Py_INCREF(Py_None);
return Py_None;
}
#ifdef __BEOS__
/* XXX: BeOS version of accept() doesn't set family correctly */
addr->sa_family = AF_INET;
#endif
switch (addr->sa_family) {
case AF_INET:
{
struct sockaddr_in *a;
PyObject *addrobj = makeipaddr(addr, sizeof(*a));
PyObject *ret = NULL;
if (addrobj) {
a = (struct sockaddr_in *)addr;
ret = Py_BuildValue("Oi", addrobj, ntohs(a->sin_port));
Py_DECREF(addrobj);
}
return ret;
}
#if defined(AF_UNIX)
case AF_UNIX:
{
struct sockaddr_un *a = (struct sockaddr_un *) addr;
return PyString_FromString(a->sun_path);
}
#endif /* AF_UNIX */
#ifdef ENABLE_IPV6
case AF_INET6:
{
struct sockaddr_in6 *a;
PyObject *addrobj = makeipaddr(addr, sizeof(*a));
PyObject *ret = NULL;
if (addrobj) {
a = (struct sockaddr_in6 *)addr;
ret = Py_BuildValue("Oiii",
addrobj,
ntohs(a->sin6_port),
a->sin6_flowinfo,
a->sin6_scope_id);
Py_DECREF(addrobj);
}
return ret;
}
#endif
#ifdef USE_BLUETOOTH
case AF_BLUETOOTH:
switch (proto) {
case BTPROTO_L2CAP:
{
struct sockaddr_l2 *a = (struct sockaddr_l2 *) addr;
PyObject *addrobj = makebdaddr(&_BT_L2_MEMB(a, bdaddr));
PyObject *ret = NULL;
if (addrobj) {
ret = Py_BuildValue("Oi",
addrobj,
_BT_L2_MEMB(a, psm));
Py_DECREF(addrobj);
}
return ret;
}
case BTPROTO_RFCOMM:
{
struct sockaddr_rc *a = (struct sockaddr_rc *) addr;
PyObject *addrobj = makebdaddr(&_BT_RC_MEMB(a, bdaddr));
PyObject *ret = NULL;
if (addrobj) {
ret = Py_BuildValue("Oi",
addrobj,