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/*
* Passing file descriptions with Python. Tested with Linux and FreeBSD.
* Should also work on Solaris. Portability fixes or success stories welcome.
*
* Neil Schemenauer <nas@arctrix.com>
*/
#include "Python.h"
#ifndef __OpenBSD__
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 500
#endif
#ifndef _XOPEN_SOURCE_EXTENDED
#define _XOPEN_SOURCE_EXTENDED 1 /* Solaris <= 2.7 needs this too */
#endif
#endif /* __OpenBSD__ */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <stddef.h>
static int
recv_fd(int sockfd)
{
char tmp[CMSG_SPACE(sizeof(int))];
struct cmsghdr *cmsg;
struct iovec iov;
struct msghdr msg;
char ch = '\0';
memset(&msg, 0, sizeof(msg));
iov.iov_base = &ch;
iov.iov_len = 1;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = tmp;
msg.msg_controllen = sizeof(tmp);
if (recvmsg(sockfd, &msg, 0) <= 0)
return -1;
cmsg = CMSG_FIRSTHDR(&msg);
return *(int *) CMSG_DATA(cmsg);
}
static int
send_fd (int sockfd, int fd)
{
char tmp[CMSG_SPACE(sizeof(int))];
struct cmsghdr *cmsg;
struct iovec iov;
struct msghdr msg;
char ch = '\0';
memset(&msg, 0, sizeof(msg));
msg.msg_control = (caddr_t) tmp;
msg.msg_controllen = CMSG_LEN(sizeof(int));
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
*(int *)CMSG_DATA(cmsg) = fd;
iov.iov_base = &ch;
iov.iov_len = 1;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
if (sendmsg(sockfd, &msg, 0) != 1)
return -1;
return 0;
}
static char sendfd_doc [] =
"sendfd(sockfd, fd)";
static PyObject *
passfd_sendfd(PyObject *self, PyObject *args)
{
int sockfd, fd;
if (!PyArg_ParseTuple(args, "ii:sendfd", &sockfd, &fd))
return NULL;
if (send_fd(sockfd, fd) < 0) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
static char recvfd_doc [] =
"recvfd(sockfd) -> fd";
static PyObject *
passfd_recvfd(PyObject *self, PyObject *args)
{
int sockfd, fd;
if (!PyArg_ParseTuple(args, "i:revcfd", &sockfd))
return NULL;
if ((fd = recv_fd(sockfd)) < 0) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
return PyInt_FromLong((long) fd);
}
static char socketpair_doc [] =
"socketpair(family, type, proto=0) -> (fd, fd)";
static PyObject *
passfd_socketpair(PyObject *self, PyObject *args)
{
int family, type, proto=0;
int fd[2];
if (!PyArg_ParseTuple(args, "ii|i:socketpair", &family, &type, &proto))
return NULL;
if (socketpair(family, type, proto, fd) < 0) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
}
return Py_BuildValue("(ii)", (long) fd[0], (long) fd[1]);
}
/* List of functions */
static PyMethodDef passfd_methods[] = {
{"sendfd", passfd_sendfd, METH_VARARGS, sendfd_doc},
{"recvfd", passfd_recvfd, METH_VARARGS, recvfd_doc},
{"socketpair", passfd_socketpair, METH_VARARGS, socketpair_doc},
{NULL, NULL} /* sentinel */
};
DL_EXPORT(void)
initpassfd(void)
{
PyObject *m;
/* Create the module and add the functions and documentation */
m = Py_InitModule3("passfd", passfd_methods, NULL);
}
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