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/* $OpenBSD: PassFd.xs,v 1.2 2014/07/11 22:28:51 bluhm Exp $ */
/*
* Copyright (c) 2014 Alexander Bluhm <bluhm@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, 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.
*/
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include <sys/socket.h>
MODULE = PassFd PACKAGE = PassFd
SV *
sendfd(PerlIO *so, PerlIO *fh)
PREINIT:
int s, fd;
struct msghdr msg;
struct cmsghdr *cmsg;
union {
struct cmsghdr hdr;
unsigned char buf[CMSG_SPACE(sizeof(int))];
} cmsgbuf;
CODE:
s = PerlIO_fileno(so);
fd = PerlIO_fileno(fh);
memset(&msg, 0, sizeof(msg));
msg.msg_control = &cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
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;
if (sendmsg(s, &msg, 0) == -1)
XSRETURN_UNDEF;
RETVAL = &PL_sv_yes;
OUTPUT:
RETVAL
PerlIO *
recvfd(PerlIO *so)
PREINIT:
PerlIO *fh = NULL;
int s, fd;
struct msghdr msg;
struct cmsghdr *cmsg;
union {
struct cmsghdr hdr;
unsigned char buf[CMSG_SPACE(sizeof(int))];
} cmsgbuf;
CODE:
s = PerlIO_fileno(so);
memset(&msg, 0, sizeof(msg));
msg.msg_control = &cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
if (recvmsg(s, &msg, 0) == -1)
XSRETURN_UNDEF;
if ((msg.msg_flags & MSG_TRUNC) || (msg.msg_flags & MSG_CTRUNC)) {
errno = EMSGSIZE;
XSRETURN_UNDEF;
}
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)) &&
cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_RIGHTS) {
fd = *(int *)CMSG_DATA(cmsg);
if ((fh = PerlIO_fdopen(fd, "r+")) == NULL)
XSRETURN_UNDEF;
RETVAL = fh;
break;
}
}
if (fh == NULL) {
errno = ESRCH;
XSRETURN_UNDEF;
}
OUTPUT:
RETVAL
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