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74ee2878b6
cpython/Modules/socketmodule.c
Guido van Rossum 27e177d005 fixed up comments describing interface
1995-03-16 15:43:47 +00:00

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/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.
All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the names of Stichting Mathematisch
Centrum or CWI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior permission.
STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
******************************************************************/
/* Socket module */
/*
This module provides an interface to Berkeley socket IPC.
Limitations:
- only AF_INET and AF_UNIX address families are supported
- no read/write operations (use send/recv or makefile instead)
Module interface:
- socket.error: exception raised for socket specific errors
- 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.getservbyname(servicename, protocolname) --> port number
- socket.socket(family, type [, proto]) --> new socket object
- socket.AF_INET, socket.SOCK_STREAM, etc.: constants from <socket.h>
- 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
Socket methods:
- s.accept() --> new socket object, sockaddr
- s.bind(sockaddr) --> None
- s.close() --> None
- s.connect(sockaddr) --> None
- s.fileno() --> file descriptor
- s.getpeername() --> sockaddr
- s.getsockname() --> sockaddr
- s.getsockopt(level, optname[, buflen]) --> int or string
- s.listen(backlog) --> None
- s.makefile([mode[, bufsize]]) --> file object
- s.recv(buflen [,flags]) --> string
- s.recvfrom(buflen [,flags]) --> string, sockaddr
- s.send(string [,flags]) --> nbytes
- s.sendto(string, [flags,] sockaddr) --> nbytes
- s.setblocking(0 | 1) --> None
- s.setsockopt(level, optname, value) --> None
- s.shutdown(how) --> None
- repr(s) --> "<socket object, fd=%d, family=%d, type=%d, protocol=%d>"
*/
#include "Python.h"
#include <sys/types.h>
#include "mytime.h"
#include <signal.h>
#ifndef NT
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <fcntl.h>
#else
#include <winsock.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#else
#undef AF_UNIX
#endif
#ifndef O_NDELAY
#define O_NDELAY O_NONBLOCK /* For QNX only? */
#endif
/* Here we have some hacks to choose between K&R or ANSI style function
definitions. For NT to build this as an extension module (ie, DLL)
it must be compiled by the C++ compiler, as it takes the address of
a static data item exported from the main Python DLL.
*/
#ifdef NT
/* seem to be a few differences in the API */
#define close closesocket
#define NO_DUP /* I wont trust passing a socket to NT's RTL!! */
#define FORCE_ANSI_FUNC_DEFS
#endif
#ifdef FORCE_ANSI_FUNC_DEFS
#define BUILD_FUNC_DEF_1( fnname, arg1type, arg1name ) \
fnname( arg1type arg1name )
#define BUILD_FUNC_DEF_2( fnname, arg1type, arg1name, arg2type, arg2name ) \
fnname( arg1type arg1name, arg2type arg2name )
#define BUILD_FUNC_DEF_3( fnname, arg1type, arg1name, arg2type, arg2name , arg3type, arg3name ) \
fnname( arg1type arg1name, arg2type arg2name, arg3type arg3name )
#define BUILD_FUNC_DEF_4( fnname, arg1type, arg1name, arg2type, arg2name , arg3type, arg3name, arg4type, arg4name ) \
fnname( arg1type arg1name, arg2type arg2name, arg3type arg3name, arg4type arg4name )
#else /* !FORCE_ANSI_FN_DEFS */
#define BUILD_FUNC_DEF_1( fnname, arg1type, arg1name ) \
fnname( arg1name ) \
arg1type arg1name;
#define BUILD_FUNC_DEF_2( fnname, arg1type, arg1name, arg2type, arg2name ) \
fnname( arg1name, arg2name ) \
arg1type arg1name; \
arg2type arg2name;
#define BUILD_FUNC_DEF_3( fnname, arg1type, arg1name, arg2type, arg2name, arg3type, arg3name ) \
fnname( arg1name, arg2name, arg3name ) \
arg1type arg1name; \
arg2type arg2name; \
arg3type arg3name;
#define BUILD_FUNC_DEF_4( fnname, arg1type, arg1name, arg2type, arg2name, arg3type, arg3name, arg4type, arg4name ) \
fnname( arg1name, arg2name, arg3name, arg4name ) \
arg1type arg1name; \
arg2type arg2name; \
arg3type arg3name; \
arg4type arg4name;
#endif /* !FORCE_ANSI_FN_DEFS */
/* Global variable holding the exception type for errors detected
by this module (but not argument type or memory errors, etc.). */
static PyObject *PySocket_Error;
/* Convenience function to raise an error according to errno
and return a NULL pointer from a function. */
static PyObject *
PySocket_Err()
{
#ifdef NT
if (WSAGetLastError()) {
PyObject *v;
v = Py_BuildValue("(is)", WSAGetLastError(), "winsock error");
if (v != NULL) {
PyErr_SetObject(PySocket_Error, v);
Py_DECREF(v);
}
return NULL;
}
else
#endif
return PyErr_SetFromErrno(PySocket_Error);
}
/* 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
int 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 */
union sock_addr {
struct sockaddr_in in;
#ifdef AF_UNIX
struct sockaddr_un un;
#endif
} sock_addr;
} PySocketSockObject;
/* A forward reference to the Socktype type object.
The Socktype variable contains pointers to various functions,
some of which call newsockobject(), which uses Socktype, so
there has to be a circular reference. */
staticforward PyTypeObject PySocketSock_Type;
/* 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 *
BUILD_FUNC_DEF_4(PySocketSock_New,int,fd, int,family, int,type, int,proto)
{
PySocketSockObject *s;
s = PyObject_NEW(PySocketSockObject, &PySocketSock_Type);
if (s != NULL) {
s->sock_fd = fd;
s->sock_family = family;
s->sock_type = type;
s->sock_proto = proto;
}
return s;
}
/* 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 (should always be 4 bytes), or negative if
an error occurred; then an exception is raised. */
static int
BUILD_FUNC_DEF_2(setipaddr, char*,name, struct sockaddr_in *,addr_ret)
{
struct hostent *hp;
int d1, d2, d3, d4;
char ch;
#ifdef HAVE_GETHOSTBYNAME_R
struct hostent hp_allocated;
char buf[1001];
int buf_len = (sizeof buf) - 1;
int errnop;
#endif /* HAVE_GETHOSTBYNAME_R */
if (name[0] == '\0') {
addr_ret->sin_addr.s_addr = INADDR_ANY;
return 4;
}
if (name[0] == '<' && strcmp(name, "<broadcast>") == 0) {
addr_ret->sin_addr.s_addr = INADDR_BROADCAST;
return 4;
}
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) {
addr_ret->sin_addr.s_addr = htonl(
((long) d1 << 24) | ((long) d2 << 16) |
((long) d3 << 8) | ((long) d4 << 0));
return 4;
}
#ifdef HAVE_GETHOSTBYNAME_R
Py_BEGIN_ALLOW_THREADS
hp = gethostbyname_r(name, &hp_allocated, buf, buf_len, &errnop);
Py_END_ALLOW_THREADS
#else /* not HAVE_GETHOSTBYNAME_R */
hp = gethostbyname(name);
#endif /* HAVE_GETHOSTBYNAME_R */
if (hp == NULL) {
#ifdef HAVE_HSTRERROR
/* Let's get real error message to return */
extern int h_errno;
PyErr_SetString(PySocket_Error, (char *)hstrerror(h_errno));
#else
PyErr_SetString(PySocket_Error, "host not found");
#endif
return -1;
}
memcpy((char *) &addr_ret->sin_addr, hp->h_addr, hp->h_length);
return hp->h_length;
}
/* 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 *
BUILD_FUNC_DEF_1(makeipaddr, struct sockaddr_in *,addr)
{
long x = ntohl(addr->sin_addr.s_addr);
char buf[100];
sprintf(buf, "%d.%d.%d.%d",
(int) (x>>24) & 0xff, (int) (x>>16) & 0xff,
(int) (x>> 8) & 0xff, (int) (x>> 0) & 0xff);
return PyString_FromString(buf);
}
/* 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 *
BUILD_FUNC_DEF_2(makesockaddr,struct sockaddr *,addr, int,addrlen)
{
if (addrlen == 0) {
/* No address -- may be recvfrom() from known socket */
Py_INCREF(Py_None);
return Py_None;
}
switch (addr->sa_family) {
case AF_INET:
{
struct sockaddr_in *a = (struct sockaddr_in *) addr;
PyObject *addr = makeipaddr(a);
PyObject *ret = Py_BuildValue("Oi", addr, ntohs(a->sin_port));
Py_XDECREF(addr);
return ret;
}
#ifdef AF_UNIX
case AF_UNIX:
{
struct sockaddr_un *a = (struct sockaddr_un *) addr;
return PyString_FromString(a->sun_path);
}
#endif /* AF_UNIX */
/* More cases here... */
default:
PyErr_SetString(PySocket_Error, "return unknown socket address type");
return NULL;
}
}
/* Parse a socket address argument according to the socket object's
address family. Return 1 if the address was in the proper format,
0 of not. The address is returned through addr_ret, its length
through len_ret. */
static int
BUILD_FUNC_DEF_4(
getsockaddrarg,PySocketSockObject *,s, PyObject *,args, struct sockaddr **,addr_ret, int *,len_ret)
{
switch (s->sock_family) {
#ifdef AF_UNIX
case AF_UNIX:
{
struct sockaddr_un* addr;
char *path;
int len;
addr = (struct sockaddr_un* )&(s->sock_addr).un;
if (!PyArg_Parse(args, "s#", &path, &len))
return 0;
if (len > sizeof addr->sun_path) {
PyErr_SetString(PySocket_Error, "AF_UNIX path too long");
return 0;
}
addr->sun_family = AF_UNIX;
memcpy(addr->sun_path, path, len);
*addr_ret = (struct sockaddr *) addr;
*len_ret = len + sizeof addr->sun_family;
return 1;
}
#endif /* AF_UNIX */
case AF_INET:
{
struct sockaddr_in* addr;
char *host;
int port;
addr=(struct sockaddr_in*)&(s->sock_addr).in;
if (!PyArg_Parse(args, "(si)", &host, &port))
return 0;
if (setipaddr(host, addr) < 0)
return 0;
addr->sin_family = AF_INET;
addr->sin_port = htons(port);
*addr_ret = (struct sockaddr *) addr;
*len_ret = sizeof *addr;
return 1;
}
/* More cases here... */
default:
PyErr_SetString(PySocket_Error, "getsockaddrarg: bad family");
return 0;
}
}
/* Get the address length according to the socket object's address family.
Return 1 if the family is known, 0 otherwise. The length is returned
through len_ret. */
static int
BUILD_FUNC_DEF_2(getsockaddrlen,PySocketSockObject *,s, int *,len_ret)
{
switch (s->sock_family) {
#ifdef AF_UNIX
case AF_UNIX:
{
*len_ret = sizeof (struct sockaddr_un);
return 1;
}
#endif /* AF_UNIX */
case AF_INET:
{
*len_ret = sizeof (struct sockaddr_in);
return 1;
}
/* More cases here... */
default:
PyErr_SetString(PySocket_Error, "getsockaddrarg: bad family");
return 0;
}
}
/* s.accept() method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_accept,PySocketSockObject *,s, PyObject *,args)
{
char addrbuf[256];
int addrlen, newfd;
PyObject *sock, *addr, *res;
if (!PyArg_NoArgs(args))
return NULL;
if (!getsockaddrlen(s, &addrlen))
return NULL;
Py_BEGIN_ALLOW_THREADS
newfd = accept(s->sock_fd, (struct sockaddr *) addrbuf, &addrlen);
Py_END_ALLOW_THREADS
if (newfd < 0)
return PySocket_Err();
/* Create the new object with unspecified family,
to avoid calls to bind() etc. on it. */
sock = (PyObject *) PySocketSock_New(newfd,
s->sock_family,
s->sock_type,
s->sock_proto);
if (sock == NULL)
close(newfd);
addr = makesockaddr((struct sockaddr *) addrbuf, addrlen);
res = Py_BuildValue("OO", sock, addr);
Py_XDECREF(sock);
Py_XDECREF(addr);
return res;
}
#if 0
/* s.allowbroadcast() method */
/* XXX obsolete -- will disappear in next release */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_allowbroadcast,PySocketSockObject *,s, PyObject *,args)
{
int flag;
int res;
if (!PyArg_Parse(args, "i", &flag))
return NULL;
res = setsockopt(s->sock_fd, SOL_SOCKET, SO_BROADCAST,
(ANY *)&flag, sizeof flag);
if (res < 0)
return PySocket_Err();
Py_INCREF(Py_None);
return Py_None;
}
#endif
#ifndef NT
/* s.setblocking(1 | 0) method */
static PyObject *
PySocketSock_setblocking(s, args)
PySocketSockObject *s;
PyObject *args;
{
int block;
int delay_flag;
if (!PyArg_GetInt(args, &block))
return NULL;
Py_BEGIN_ALLOW_THREADS
delay_flag = fcntl (s->sock_fd, F_GETFL, 0);
if (block)
delay_flag &= (~O_NDELAY);
else
delay_flag |= O_NDELAY;
fcntl (s->sock_fd, F_SETFL, delay_flag);
Py_END_ALLOW_THREADS
Py_INCREF(Py_None);
return Py_None;
}
#endif
/* s.setsockopt() method.
With an integer third argument, sets an integer option.
With a string third argument, sets an option from a buffer;
use optional built-in module 'struct' to encode the string. */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_setsockopt,PySocketSockObject *,s, PyObject *,args)
{
int level;
int optname;
int res;
char *buf;
int buflen;
int flag;
if (PyArg_Parse(args, "(iii)", &level, &optname, &flag)) {
buf = (char *) &flag;
buflen = sizeof flag;
}
else {
PyErr_Clear();
if (!PyArg_Parse(args, "(iis#)", &level, &optname, &buf, &buflen))
return NULL;
}
res = setsockopt(s->sock_fd, level, optname, (ANY *)buf, buflen);
if (res < 0)
return PySocket_Err();
Py_INCREF(Py_None);
return Py_None;
}
/* s.getsockopt() method.
With two arguments, retrieves an integer option.
With a third integer argument, retrieves a string buffer of that size;
use optional built-in module 'struct' to decode the string. */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_getsockopt,PySocketSockObject *,s, PyObject *,args)
{
int level;
int optname;
int res;
PyObject *buf;
int buflen;
int flag;
if (PyArg_Parse(args, "(ii)", &level, &optname)) {
int flag = 0;
int flagsize = sizeof flag;
res = getsockopt(s->sock_fd, level, optname,
(ANY *)&flag, &flagsize);
if (res < 0)
return PySocket_Err();
return PyInt_FromLong(flag);
}
PyErr_Clear();
if (!PyArg_Parse(args, "(iii)", &level, &optname, &buflen))
return NULL;
if (buflen <= 0 || buflen > 1024) {
PyErr_SetString(PySocket_Error, "getsockopt buflen out of range");
return NULL;
}
buf = PyString_FromStringAndSize((char *)NULL, buflen);
if (buf == NULL)
return NULL;
res = getsockopt(s->sock_fd, level, optname,
(ANY *)PyString_AsString(buf), &buflen);
if (res < 0) {
Py_DECREF(buf);
return PySocket_Err();
}
_PyString_Resize(&buf, buflen);
return buf;
}
/* s.bind(sockaddr) method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_bind,PySocketSockObject *,s, PyObject *,args)
{
struct sockaddr *addr;
int addrlen;
int res;
if (!getsockaddrarg(s, args, &addr, &addrlen))
return NULL;
Py_BEGIN_ALLOW_THREADS
res = bind(s->sock_fd, addr, addrlen);
Py_END_ALLOW_THREADS
if (res < 0)
return PySocket_Err();
Py_INCREF(Py_None);
return Py_None;
}
/* s.close() method.
Set the file descriptor to -1 so operations tried subsequently
will surely fail. */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_close,PySocketSockObject *,s, PyObject *,args)
{
if (!PyArg_NoArgs(args))
return NULL;
Py_BEGIN_ALLOW_THREADS
(void) close(s->sock_fd);
Py_END_ALLOW_THREADS
s->sock_fd = -1;
Py_INCREF(Py_None);
return Py_None;
}
/* s.connect(sockaddr) method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_connect,PySocketSockObject *,s, PyObject *,args)
{
struct sockaddr *addr;
int addrlen;
int res;
if (!getsockaddrarg(s, args, &addr, &addrlen))
return NULL;
Py_BEGIN_ALLOW_THREADS
res = connect(s->sock_fd, addr, addrlen);
Py_END_ALLOW_THREADS
if (res < 0)
return PySocket_Err();
Py_INCREF(Py_None);
return Py_None;
}
/* s.fileno() method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_fileno,PySocketSockObject *,s, PyObject *,args)
{
if (!PyArg_NoArgs(args))
return NULL;
return PyInt_FromLong((long) s->sock_fd);
}
/* s.getsockname() method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_getsockname,PySocketSockObject *,s, PyObject *,args)
{
char addrbuf[256];
int addrlen, res;
if (!PyArg_NoArgs(args))
return NULL;
if (!getsockaddrlen(s, &addrlen))
return NULL;
Py_BEGIN_ALLOW_THREADS
res = getsockname(s->sock_fd, (struct sockaddr *) addrbuf, &addrlen);
Py_END_ALLOW_THREADS
if (res < 0)
return PySocket_Err();
return makesockaddr((struct sockaddr *) addrbuf, addrlen);
}
#ifdef HAVE_GETPEERNAME /* Cray APP doesn't have this :-( */
/* s.getpeername() method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_getpeername,PySocketSockObject *,s, PyObject *,args)
{
char addrbuf[256];
int addrlen, res;
if (!PyArg_NoArgs(args))
return NULL;
if (!getsockaddrlen(s, &addrlen))
return NULL;
Py_BEGIN_ALLOW_THREADS
res = getpeername(s->sock_fd, (struct sockaddr *) addrbuf, &addrlen);
Py_END_ALLOW_THREADS
if (res < 0)
return PySocket_Err();
return makesockaddr((struct sockaddr *) addrbuf, addrlen);
}
#endif /* HAVE_GETPEERNAME */
/* s.listen(n) method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_listen,PySocketSockObject *,s, PyObject *,args)
{
int backlog;
int res;
if (!PyArg_GetInt(args, &backlog))
return NULL;
Py_BEGIN_ALLOW_THREADS
if (backlog < 1)
backlog = 1;
res = listen(s->sock_fd, backlog);
Py_END_ALLOW_THREADS
if (res < 0)
return PySocket_Err();
Py_INCREF(Py_None);
return Py_None;
}
#ifndef NO_DUP
/* s.makefile(mode) method.
Create a new open file object referring to a dupped version of
the socket's file descriptor. (The dup() call is necessary so
that the open file and socket objects may be closed independent
of each other.)
The mode argument specifies 'r' or 'w' passed to fdopen(). */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_makefile,PySocketSockObject *,s, PyObject *,args)
{
extern int fclose Py_PROTO((FILE *));
char *mode = "r";
int bufsize = -1;
int fd;
FILE *fp;
PyObject *f;
if (!PyArg_ParseTuple(args, "|si", &mode, &bufsize))
return NULL;
if ((fd = dup(s->sock_fd)) < 0 ||
(fp = fdopen(fd, mode)) == NULL) {
if (fd >= 0)
close(fd);
return PySocket_Err();
}
f = PyFile_FromFile(fp, "<socket>", mode, fclose);
if (f != NULL)
PyFile_SetBufSize(f, bufsize);
return f;
}
#endif /* NO_DUP */
/* s.recv(nbytes [,flags]) method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_recv,PySocketSockObject *,s, PyObject *,args)
{
int len, n, flags;
PyObject *buf;
flags = 0;
if (!PyArg_Parse(args, "i", &len)) {
PyErr_Clear();
if (!PyArg_Parse(args, "(ii)", &len, &flags))
return NULL;
}
buf = PyString_FromStringAndSize((char *) 0, len);
if (buf == NULL)
return NULL;
Py_BEGIN_ALLOW_THREADS
n = recv(s->sock_fd, PyString_AsString(buf), len, flags);
Py_END_ALLOW_THREADS
if (n < 0)
return PySocket_Err();
if (_PyString_Resize(&buf, n) < 0)
return NULL;
return buf;
}
/* s.recvfrom(nbytes [,flags]) method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_recvfrom,PySocketSockObject *,s, PyObject *,args)
{
char addrbuf[256];
PyObject *buf, *addr, *ret;
int addrlen, len, n, flags;
flags = 0;
if (!PyArg_Parse(args, "i", &len)) {
PyErr_Clear();
if (!PyArg_Parse(args, "(ii)", &len, &flags))
return NULL;
}
if (!getsockaddrlen(s, &addrlen))
return NULL;
buf = PyString_FromStringAndSize((char *) 0, len);
if (buf == NULL)
return NULL;
Py_BEGIN_ALLOW_THREADS
n = recvfrom(s->sock_fd, PyString_AsString(buf), len, flags,
#ifndef NT
(ANY *)addrbuf, &addrlen);
#else
(struct sockaddr *)addrbuf, &addrlen);
#endif
Py_END_ALLOW_THREADS
if (n < 0)
return PySocket_Err();
if (_PyString_Resize(&buf, n) < 0)
return NULL;
addr = makesockaddr((struct sockaddr *)addrbuf, addrlen);
ret = Py_BuildValue("OO", buf, addr);
Py_XDECREF(addr);
Py_XDECREF(buf);
return ret;
}
/* s.send(data [,flags]) method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_send,PySocketSockObject *,s, PyObject *,args)
{
char *buf;
int len, n, flags;
flags = 0;
if (!PyArg_Parse(args, "s#", &buf, &len)) {
PyErr_Clear();
if (!PyArg_Parse(args, "(s#i)", &buf, &len, &flags))
return NULL;
}
Py_BEGIN_ALLOW_THREADS
n = send(s->sock_fd, buf, len, flags);
Py_END_ALLOW_THREADS
if (n < 0)
return PySocket_Err();
return PyInt_FromLong((long)n);
}
/* s.sendto(data, [flags,] sockaddr) method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_sendto,PySocketSockObject *,s, PyObject *,args)
{
PyObject *addro;
char *buf;
struct sockaddr *addr;
int addrlen, len, n, flags;
flags = 0;
if (!PyArg_Parse(args, "(s#O)", &buf, &len, &addro)) {
PyErr_Clear();
if (!PyArg_Parse(args, "(s#iO)", &buf, &len, &flags, &addro))
return NULL;
}
if (!getsockaddrarg(s, addro, &addr, &addrlen))
return NULL;
Py_BEGIN_ALLOW_THREADS
n = sendto(s->sock_fd, buf, len, flags, addr, addrlen);
Py_END_ALLOW_THREADS
if (n < 0)
return PySocket_Err();
return PyInt_FromLong((long)n);
}
/* s.shutdown(how) method */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_shutdown,PySocketSockObject *,s, PyObject *,args)
{
int how;
int res;
if (!PyArg_GetInt(args, &how))
return NULL;
Py_BEGIN_ALLOW_THREADS
res = shutdown(s->sock_fd, how);
Py_END_ALLOW_THREADS
if (res < 0)
return PySocket_Err();
Py_INCREF(Py_None);
return Py_None;
}
/* List of methods for socket objects */
static PyMethodDef PySocketSock_methods[] = {
{"accept", (PyCFunction)PySocketSock_accept},
#if 0
{"allowbroadcast", (PyCFunction)PySocketSock_allowbroadcast},
#endif
#ifndef NT
{"setblocking", (PyCFunction)PySocketSock_setblocking},
#endif
{"setsockopt", (PyCFunction)PySocketSock_setsockopt},
{"getsockopt", (PyCFunction)PySocketSock_getsockopt},
{"bind", (PyCFunction)PySocketSock_bind},
{"close", (PyCFunction)PySocketSock_close},
{"connect", (PyCFunction)PySocketSock_connect},
{"fileno", (PyCFunction)PySocketSock_fileno},
{"getsockname", (PyCFunction)PySocketSock_getsockname},
#ifdef HAVE_GETPEERNAME
{"getpeername", (PyCFunction)PySocketSock_getpeername},
#endif
{"listen", (PyCFunction)PySocketSock_listen},
#ifndef NO_DUP
{"makefile", (PyCFunction)PySocketSock_makefile, 1},
#endif
{"recv", (PyCFunction)PySocketSock_recv},
{"recvfrom", (PyCFunction)PySocketSock_recvfrom},
{"send", (PyCFunction)PySocketSock_send},
{"sendto", (PyCFunction)PySocketSock_sendto},
{"shutdown", (PyCFunction)PySocketSock_shutdown},
{NULL, NULL} /* sentinel */
};
/* Deallocate a socket object in response to the last Py_DECREF().
First close the file description. */
static void
BUILD_FUNC_DEF_1(PySocketSock_dealloc,PySocketSockObject *,s)
{
(void) close(s->sock_fd);
PyMem_DEL(s);
}
/* Return a socket object's named attribute. */
static PyObject *
BUILD_FUNC_DEF_2(PySocketSock_getattr,PySocketSockObject *,s, char *,name)
{
return Py_FindMethod(PySocketSock_methods, (PyObject *) s, name);
}
static PyObject *
BUILD_FUNC_DEF_1(PySocketSock_repr,PySocketSockObject *,s)
{
PyObject *addro;
struct sockaddr *addr;
char buf[512];
PyObject *t, *comma, *v;
int i, len;
sprintf(buf,
"<socket object, fd=%d, family=%d, type=%d, protocol=%d>",
s->sock_fd, s->sock_family, s->sock_type, s->sock_proto);
t = PyString_FromString(buf);
return t;
}
/* Type object for socket objects. */
static PyTypeObject PySocketSock_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0,
"socket",
sizeof(PySocketSockObject),
0,
(destructor)PySocketSock_dealloc, /*tp_dealloc*/
0, /*tp_print*/
(getattrfunc)PySocketSock_getattr, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
(reprfunc)PySocketSock_repr, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
};
/* Python interface to gethostname(). */
/*ARGSUSED*/
static PyObject *
BUILD_FUNC_DEF_2(PySocket_gethostname,PyObject *,self, PyObject *,args)
{
char buf[1024];
int res;
if (!PyArg_NoArgs(args))
return NULL;
Py_BEGIN_ALLOW_THREADS
res = gethostname(buf, (int) sizeof buf - 1);
Py_END_ALLOW_THREADS
if (res < 0)
return PySocket_Err();
buf[sizeof buf - 1] = '\0';
return PyString_FromString(buf);
}
/* Python interface to gethostbyname(name). */
/*ARGSUSED*/
static PyObject *
BUILD_FUNC_DEF_2(PySocket_gethostbyname,PyObject *,self, PyObject *,args)
{
char *name;
struct sockaddr_in addrbuf;
if (!PyArg_Parse(args, "s", &name))
return NULL;
if (setipaddr(name, &addrbuf) < 0)
return NULL;
return makeipaddr(&addrbuf);
}
/* Python interface to gethostbyaddr(IP). */
/*ARGSUSED*/
static PyObject *
BUILD_FUNC_DEF_2(PySocket_gethostbyaddr,PyObject *,self, PyObject *, args)
{
struct sockaddr_in addr;
char *ip_num;
struct hostent *h;
int d1,d2,d3,d4;
char ch, **pch;
PyObject *rtn_tuple = (PyObject *)NULL;
PyObject *name_list = (PyObject *)NULL;
PyObject *addr_list = (PyObject *)NULL;
PyObject *tmp;
if (!PyArg_Parse(args, "s", &ip_num))
return NULL;
if (setipaddr(ip_num, &addr) < 0)
return NULL;
h = gethostbyaddr((char *)&addr.sin_addr,
sizeof(addr.sin_addr),
AF_INET);
if (h == NULL) {
#ifdef HAVE_HSTRERROR
/* Let's get real error message to return */
extern int h_errno;
PyErr_SetString(PySocket_Error, (char *)hstrerror(h_errno));
#else
PyErr_SetString(PySocket_Error, "host not found");
#endif
return NULL;
}
if ((name_list = PyList_New(0)) == NULL)
goto err;
if ((addr_list = PyList_New(0)) == NULL)
goto err;
for (pch = h->h_aliases; *pch != NULL; pch++) {
tmp = PyString_FromString(*pch);
if (tmp == NULL)
goto err;
PyList_Append(name_list, tmp);
Py_DECREF(tmp);
}
for (pch = h->h_addr_list; *pch != NULL; pch++) {
memcpy((char *) &addr.sin_addr, *pch, h->h_length);
tmp = makeipaddr(&addr);
if (tmp == NULL)
goto err;
PyList_Append(addr_list, tmp);
Py_DECREF(tmp);
}
rtn_tuple = Py_BuildValue("sOO", h->h_name, name_list, addr_list);
err:
Py_XDECREF(name_list);
Py_XDECREF(addr_list);
return rtn_tuple;
}
/* Python interface to getservbyname(name).
This only returns the port number, since the other info is already
known or not useful (like the list of aliases). */
/*ARGSUSED*/
static PyObject *
BUILD_FUNC_DEF_2(PySocket_getservbyname,PyObject *,self, PyObject *,args)
{
char *name, *proto;
struct servent *sp;
if (!PyArg_Parse(args, "(ss)", &name, &proto))
return NULL;
Py_BEGIN_ALLOW_THREADS
sp = getservbyname(name, proto);
Py_END_ALLOW_THREADS
if (sp == NULL) {
PyErr_SetString(PySocket_Error, "service/proto not found");
return NULL;
}
return PyInt_FromLong((long) ntohs(sp->s_port));
}
/* Python interface to socket(family, type, proto).
The third (protocol) argument is optional.
Return a new socket object. */
/*ARGSUSED*/
static PyObject *
BUILD_FUNC_DEF_2(PySocket_socket,PyObject *,self, PyObject *,args)
{
PySocketSockObject *s;
int fd, family, type, proto;
proto = 0;
if (!PyArg_Parse(args, "(ii)", &family, &type)) {
PyErr_Clear();
if (!PyArg_Parse(args, "(iii)", &family, &type, &proto))
return NULL;
}
Py_BEGIN_ALLOW_THREADS
fd = socket(family, type, proto);
Py_END_ALLOW_THREADS
if (fd < 0)
return PySocket_Err();
s = PySocketSock_New(fd, family, type, proto);
/* If the object can't be created, don't forget to close the
file descriptor again! */
if (s == NULL)
(void) close(fd);
/* From now on, ignore SIGPIPE and let the error checking
do the work. */
#ifdef SIGPIPE
(void) signal(SIGPIPE, SIG_IGN);
#endif
return (PyObject *) s;
}
#ifndef NO_DUP
/* Create a socket object from a numeric file description.
Useful e.g. if stdin is a socket.
Additional arguments as for socket(). */
/*ARGSUSED*/
static PyObject *
BUILD_FUNC_DEF_2(PySocket_fromfd,PyObject *,self, PyObject *,args)
{
PySocketSockObject *s;
int fd, family, type, proto;
proto = 0;
if (!PyArg_Parse(args, "(iii)", &fd, &family, &type)) {
PyErr_Clear();
if (!PyArg_Parse(args, "(iiii)", &fd, &family, &type, &proto))
return NULL;
}
/* Dup the fd so it and the socket can be closed independently */
fd = dup(fd);
if (fd < 0)
return PySocket_Err();
s = PySocketSock_New(fd, family, type, proto);
/* From now on, ignore SIGPIPE and let the error checking
do the work. */
#ifdef SIGPIPE
(void) signal(SIGPIPE, SIG_IGN);
#endif
return (PyObject *) s;
}
#endif /* NO_DUP */
/* List of functions exported by this module. */
static PyMethodDef PySocket_methods[] = {
{"gethostbyname", PySocket_gethostbyname},
{"gethostbyaddr", PySocket_gethostbyaddr},
{"gethostname", PySocket_gethostname},
{"getservbyname", PySocket_getservbyname},
{"socket", PySocket_socket},
#ifndef NO_DUP
{"fromfd", PySocket_fromfd},
#endif
{NULL, NULL} /* Sentinel */
};
/* Convenience routine to export an integer value.
For simplicity, errors (which are unlikely anyway) are ignored. */
static void
BUILD_FUNC_DEF_3(insint,PyObject *,d, char *,name, int,value)
{
PyObject *v = PyInt_FromLong((long) value);
if (v == NULL) {
/* Don't bother reporting this error */
PyErr_Clear();
}
else {
PyDict_SetItemString(d, name, v);
Py_DECREF(v);
}
}
/* Initialize this module.
This is called when the first 'import socket' is done,
via a table in config.c, if config.c is compiled with USE_SOCKET
defined. */
void
initsocket()
{
PyObject *m, *d;
m = Py_InitModule("socket", PySocket_methods);
d = PyModule_GetDict(m);
PySocket_Error = PyString_FromString("socket.error");
if (PySocket_Error == NULL ||
PyDict_SetItemString(d, "error", PySocket_Error) != 0)
Py_FatalError("can't define socket.error");
insint(d, "AF_INET", AF_INET);
#ifdef AF_UNIX
insint(d, "AF_UNIX", AF_UNIX);
#endif /* AF_UNIX */
insint(d, "SOCK_STREAM", SOCK_STREAM);
insint(d, "SOCK_DGRAM", SOCK_DGRAM);
insint(d, "SOCK_RAW", SOCK_RAW);
insint(d, "SOCK_SEQPACKET", SOCK_SEQPACKET);
insint(d, "SOCK_RDM", SOCK_RDM);
#ifdef SO_DEBUG
insint(d, "SO_DEBUG", SO_DEBUG);
#endif
#ifdef SO_ACCEPTCONN
insint(d, "SO_ACCEPTCONN", SO_ACCEPTCONN);
#endif
#ifdef SO_REUSEADDR
insint(d, "SO_REUSEADDR", SO_REUSEADDR);
#endif
#ifdef SO_KEEPALIVE
insint(d, "SO_KEEPALIVE", SO_KEEPALIVE);
#endif
#ifdef SO_DONTROUTE
insint(d, "SO_DONTROUTE", SO_DONTROUTE);
#endif
#ifdef SO_BROADCAST
insint(d, "SO_BROADCAST", SO_BROADCAST);
#endif
#ifdef SO_USELOOPBACK
insint(d, "SO_USELOOPBACK", SO_USELOOPBACK);
#endif
#ifdef SO_LINGER
insint(d, "SO_LINGER", SO_LINGER);
#endif
#ifdef SO_OOBINLINE
insint(d, "SO_OOBINLINE", SO_OOBINLINE);
#endif
#ifdef SO_REUSEPORT
insint(d, "SO_REUSEPORT", SO_REUSEPORT);
#endif
#ifdef SO_SNDBUF
insint(d, "SO_SNDBUF", SO_SNDBUF);
#endif
#ifdef SO_RCVBUF
insint(d, "SO_RCVBUF", SO_RCVBUF);
#endif
#ifdef SO_SNDLOWAT
insint(d, "SO_SNDLOWAT", SO_SNDLOWAT);
#endif
#ifdef SO_RCVLOWAT
insint(d, "SO_RCVLOWAT", SO_RCVLOWAT);
#endif
#ifdef SO_SNDTIMEO
insint(d, "SO_SNDTIMEO", SO_SNDTIMEO);
#endif
#ifdef SO_RCVTIMEO
insint(d, "SO_RCVTIMEO", SO_RCVTIMEO);
#endif
#ifdef SO_ERROR
insint(d, "SO_ERROR", SO_ERROR);
#endif
#ifdef SO_TYPE
insint(d, "SO_TYPE", SO_TYPE);
#endif
/* Maximum number of connections for "listen" */
#ifdef SOMAXCONN
insint(d, "SOMAXCONN", SOMAXCONN);
#else
insint(d, "SOMAXCONN", 5); /* Common value */
#endif
/* Flags for send, recv */
#ifdef MSG_OOB
insint(d, "MSG_OOB", MSG_OOB);
#endif
#ifdef MSG_PEEK
insint(d, "MSG_PEEK", MSG_PEEK);
#endif
#ifdef MSG_DONTROUTE
insint(d, "MSG_DONTROUTE", MSG_DONTROUTE);
#endif
#ifdef MSG_EOR
insint(d, "MSG_EOR", MSG_EOR);
#endif
#ifdef MSG_TRUNC
insint(d, "MSG_TRUNC", MSG_TRUNC);
#endif
#ifdef MSG_CTRUNC
insint(d, "MSG_CTRUNC", MSG_CTRUNC);
#endif
#ifdef MSG_WAITALL
insint(d, "MSG_WAITALL", MSG_WAITALL);
#endif
#ifdef MSG_BTAG
insint(d, "MSG_BTAG", MSG_BTAG);
#endif
#ifdef MSG_ETAG
insint(d, "MSG_ETAG", MSG_ETAG);
#endif
/* Protocol level and numbers, usable for [gs]etsockopt */
#ifdef SOL_SOCKET
insint(d, "SOL_SOCKET", SOL_SOCKET);
#endif
#ifdef IPPROTO_IP
insint(d, "IPPROTO_IP", IPPROTO_IP);
#endif
#ifdef IPPROTO_ICMP
insint(d, "IPPROTO_ICMP", IPPROTO_ICMP);
#endif
#ifdef IPPROTO_IGMP
insint(d, "IPPROTO_IGMP", IPPROTO_IGMP);
#endif
#ifdef IPPROTO_GGP
insint(d, "IPPROTO_GGP", IPPROTO_GGP);
#endif
#ifdef IPPROTO_TCP
insint(d, "IPPROTO_TCP", IPPROTO_TCP);
#endif
#ifdef IPPROTO_EGP
insint(d, "IPPROTO_EGP", IPPROTO_EGP);
#endif
#ifdef IPPROTO_PUP
insint(d, "IPPROTO_PUP", IPPROTO_PUP);
#endif
#ifdef IPPROTO_UDP
insint(d, "IPPROTO_UDP", IPPROTO_UDP);
#endif
#ifdef IPPROTO_IDP
insint(d, "IPPROTO_IDP", IPPROTO_IDP);
#endif
#ifdef IPPROTO_HELLO
insint(d, "IPPROTO_HELLO", IPPROTO_HELLO);
#endif
#ifdef IPPROTO_ND
insint(d, "IPPROTO_ND", IPPROTO_ND);
#endif
#ifdef IPPROTO_TP
insint(d, "IPPROTO_TP", IPPROTO_TP);
#endif
#ifdef IPPROTO_XTP
insint(d, "IPPROTO_XTP", IPPROTO_XTP);
#endif
#ifdef IPPROTO_EON
insint(d, "IPPROTO_EON", IPPROTO_EON);
#endif
#ifdef IPPROTO_BIP
insint(d, "IPPROTO_BIP", IPPROTO_BIP);
#endif
/**/
#ifdef IPPROTO_RAW
insint(d, "IPPROTO_RAW", IPPROTO_RAW);
#endif
#ifdef IPPROTO_MAX
insint(d, "IPPROTO_MAX", IPPROTO_MAX);
#endif
/* Some port configuration */
#ifdef IPPORT_RESERVED
insint(d, "IPPORT_RESERVED", IPPORT_RESERVED);
#else
insint(d, "IPPORT_RESERVED", 1024);
#endif
#ifdef IPPORT_USERRESERVED
insint(d, "IPPORT_USERRESERVED", IPPORT_USERRESERVED);
#else
insint(d, "IPPORT_USERRESERVED", 5000);
#endif
/* Some reserved IP v.4 addresses */
#ifdef INADDR_ANY
insint(d, "INADDR_ANY", INADDR_ANY);
#else
insint(d, "INADDR_ANY", 0x00000000);
#endif
#ifdef INADDR_BROADCAST
insint(d, "INADDR_BROADCAST", INADDR_BROADCAST);
#else
insint(d, "INADDR_BROADCAST", 0xffffffff);
#endif
#ifdef INADDR_LOOPBACK
insint(d, "INADDR_LOOPBACK", INADDR_LOOPBACK);
#else
insint(d, "INADDR_LOOPBACK", 0x7F000001);
#endif
#ifdef INADDR_UNSPEC_GROUP
insint(d, "INADDR_UNSPEC_GROUP", INADDR_UNSPEC_GROUP);
#else
insint(d, "INADDR_UNSPEC_GROUP", 0xe0000000);
#endif
#ifdef INADDR_ALLHOSTS_GROUP
insint(d, "INADDR_ALLHOSTS_GROUP", INADDR_ALLHOSTS_GROUP);
#else
insint(d, "INADDR_ALLHOSTS_GROUP", 0xe0000001);
#endif
#ifdef INADDR_MAX_LOCAL_GROUP
insint(d, "INADDR_MAX_LOCAL_GROUP", INADDR_MAX_LOCAL_GROUP);
#else
insint(d, "INADDR_MAX_LOCAL_GROUP", 0xe00000ff);
#endif
#ifdef INADDR_NONE
insint(d, "INADDR_NONE", INADDR_NONE);
#else
insint(d, "INADDR_NONE", 0xffffffff);
#endif
/* IP [gs]etsockopt options */
#ifdef IP_OPTIONS
insint(d, "IP_OPTIONS", IP_OPTIONS);
#endif
#ifdef IP_HDRINCL
insint(d, "IP_HDRINCL", IP_HDRINCL);
#endif
#ifdef IP_TOS
insint(d, "IP_TOS", IP_TOS);
#endif
#ifdef IP_TTL
insint(d, "IP_TTL", IP_TTL);
#endif
#ifdef IP_RECVOPTS
insint(d, "IP_RECVOPTS", IP_RECVOPTS);
#endif
#ifdef IP_RECVRETOPTS
insint(d, "IP_RECVRETOPTS", IP_RECVRETOPTS);
#endif
#ifdef IP_RECVDSTADDR
insint(d, "IP_RECVDSTADDR", IP_RECVDSTADDR);
#endif
#ifdef IP_RETOPTS
insint(d, "IP_RETOPTS", IP_RETOPTS);
#endif
#ifdef IP_MULTICAST_IF
insint(d, "IP_MULTICAST_IF", IP_MULTICAST_IF);
#endif
#ifdef IP_MULTICAST_TTL
insint(d, "IP_MULTICAST_TTL", IP_MULTICAST_TTL);
#endif
#ifdef IP_MULTICAST_LOOP
insint(d, "IP_MULTICAST_LOOP", IP_MULTICAST_LOOP);
#endif
#ifdef IP_ADD_MEMBERSHIP
insint(d, "IP_ADD_MEMBERSHIP", IP_ADD_MEMBERSHIP);
#endif
#ifdef IP_DROP_MEMBERSHIP
insint(d, "IP_DROP_MEMBERSHIP", IP_DROP_MEMBERSHIP);
#endif
}
#ifdef NT
BOOL WINAPI DllMain (HANDLE hInst,
ULONG ul_reason_for_call,
LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
WSADATA WSAData;
if (WSAStartup(MAKEWORD(2,0), &WSAData)) {
OutputDebugString("Python can't initialize Windows Sockets DLL!");
return FALSE;
}
break;
case DLL_PROCESS_DETACH:
WSACleanup();
break;
}
return TRUE;
}
#endif /* NT */
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