141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/* $OpenBSD: monitor_fdpass.c,v 1.22 2020/10/18 11:32:01 djm Exp $ */
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/*
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* Copyright 2001 Niels Provos <provos@citi.umich.edu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <errno.h>
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#include <poll.h>
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#include <string.h>
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#include <stdarg.h>
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#include "log.h"
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#include "monitor_fdpass.h"
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int
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mm_send_fd(int sock, int fd)
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{
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struct msghdr msg;
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union {
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struct cmsghdr hdr;
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char buf[CMSG_SPACE(sizeof(int))];
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} cmsgbuf;
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struct cmsghdr *cmsg;
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struct iovec vec;
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char ch = '\0';
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ssize_t n;
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struct pollfd pfd;
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memset(&msg, 0, sizeof(msg));
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memset(&cmsgbuf, 0, sizeof(cmsgbuf));
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msg.msg_control = (caddr_t)&cmsgbuf.buf;
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msg.msg_controllen = sizeof(cmsgbuf.buf);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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*(int *)CMSG_DATA(cmsg) = fd;
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vec.iov_base = &ch;
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vec.iov_len = 1;
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msg.msg_iov = &vec;
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msg.msg_iovlen = 1;
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pfd.fd = sock;
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pfd.events = POLLOUT;
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while ((n = sendmsg(sock, &msg, 0)) == -1 &&
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(errno == EAGAIN || errno == EINTR)) {
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debug3_f("sendmsg(%d): %s", fd, strerror(errno));
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(void)poll(&pfd, 1, -1);
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}
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if (n == -1) {
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error_f("sendmsg(%d): %s", fd, strerror(errno));
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return -1;
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}
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if (n != 1) {
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error_f("sendmsg: expected sent 1 got %zd", n);
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return -1;
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}
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return 0;
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}
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int
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mm_receive_fd(int sock)
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{
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struct msghdr msg;
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union {
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struct cmsghdr hdr;
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char buf[CMSG_SPACE(sizeof(int))];
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} cmsgbuf;
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struct cmsghdr *cmsg;
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struct iovec vec;
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ssize_t n;
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char ch;
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int fd;
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struct pollfd pfd;
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memset(&msg, 0, sizeof(msg));
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memset(&cmsgbuf, 0, sizeof(cmsgbuf));
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vec.iov_base = &ch;
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vec.iov_len = 1;
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msg.msg_iov = &vec;
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msg.msg_iovlen = 1;
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msg.msg_control = &cmsgbuf.buf;
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msg.msg_controllen = sizeof(cmsgbuf.buf);
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pfd.fd = sock;
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pfd.events = POLLIN;
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while ((n = recvmsg(sock, &msg, 0)) == -1 &&
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(errno == EAGAIN || errno == EINTR)) {
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debug3_f("recvmsg: %s", strerror(errno));
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(void)poll(&pfd, 1, -1);
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}
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if (n == -1) {
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error_f("recvmsg: %s", strerror(errno));
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return -1;
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}
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if (n != 1) {
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error_f("recvmsg: expected received 1 got %zd", n);
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return -1;
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}
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cmsg = CMSG_FIRSTHDR(&msg);
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if (cmsg == NULL) {
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error_f("no message header");
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return -1;
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}
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if (cmsg->cmsg_type != SCM_RIGHTS) {
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error_f("expected %d got %d", SCM_RIGHTS, cmsg->cmsg_type);
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return -1;
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}
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fd = (*(int *)CMSG_DATA(cmsg));
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return fd;
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}
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