/* $OpenBSD: privsep_fdpass.c,v 1.4 2008/03/15 16:19:02 deraadt Exp $ */ /* * Copyright 2001 Niels Provos * All rights reserved. * * Copyright (c) 2002 Matthieu Herrb * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pflogd.h" void send_fd(int sock, int fd) { struct msghdr msg; union { struct cmsghdr hdr; char buf[CMSG_SPACE(sizeof(int))]; } cmsgbuf; struct cmsghdr *cmsg; struct iovec vec; int result = 0; ssize_t n; memset(&msg, 0, sizeof(msg)); if (fd >= 0) { msg.msg_control = (caddr_t)&cmsgbuf.buf; 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; } else { result = errno; } vec.iov_base = &result; vec.iov_len = sizeof(int); msg.msg_iov = &vec; msg.msg_iovlen = 1; if ((n = sendmsg(sock, &msg, 0)) == -1) warn("%s: sendmsg(%d)", __func__, sock); if (n != sizeof(int)) warnx("%s: sendmsg: expected sent 1 got %ld", __func__, (long)n); } int receive_fd(int sock) { struct msghdr msg; union { struct cmsghdr hdr; char buf[CMSG_SPACE(sizeof(int))]; } cmsgbuf; struct cmsghdr *cmsg; struct iovec vec; ssize_t n; int result; int fd; memset(&msg, 0, sizeof(msg)); vec.iov_base = &result; vec.iov_len = sizeof(int); msg.msg_iov = &vec; msg.msg_iovlen = 1; msg.msg_control = &cmsgbuf.buf; msg.msg_controllen = CMSG_LEN(sizeof(int)); if ((n = recvmsg(sock, &msg, 0)) == -1) warn("%s: recvmsg", __func__); if (n != sizeof(int)) warnx("%s: recvmsg: expected received 1 got %ld", __func__, (long)n); if (result == 0) { cmsg = CMSG_FIRSTHDR(&msg); if (cmsg == NULL) { warnx("%s: no message header", __func__); return -1; } if (cmsg->cmsg_type != SCM_RIGHTS) warnx("%s: expected type %d got %d", __func__, SCM_RIGHTS, cmsg->cmsg_type); fd = (*(int *)CMSG_DATA(cmsg)); return fd; } else { errno = result; return -1; } }