1204917Sdes/* $OpenBSD: monitor_fdpass.c,v 1.19 2010/01/12 00:58:25 djm Exp $ */ 298675Sdes/* 398675Sdes * Copyright 2001 Niels Provos <provos@citi.umich.edu> 498675Sdes * All rights reserved. 598675Sdes * 698675Sdes * Redistribution and use in source and binary forms, with or without 798675Sdes * modification, are permitted provided that the following conditions 898675Sdes * are met: 998675Sdes * 1. Redistributions of source code must retain the above copyright 1098675Sdes * notice, this list of conditions and the following disclaimer. 1198675Sdes * 2. Redistributions in binary form must reproduce the above copyright 1298675Sdes * notice, this list of conditions and the following disclaimer in the 1398675Sdes * documentation and/or other materials provided with the distribution. 1498675Sdes * 1598675Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1698675Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1798675Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 1898675Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 1998675Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2098675Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2198675Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2298675Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2398675Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2498675Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2598675Sdes */ 2698675Sdes 2798675Sdes#include "includes.h" 2898675Sdes 29162852Sdes#include <sys/types.h> 30162852Sdes#include <sys/socket.h> 3198675Sdes#include <sys/uio.h> 32164146Sdes#ifdef HAVE_SYS_UN_H 33164146Sdes#include <sys/un.h> 34164146Sdes#endif 3598675Sdes 36162852Sdes#include <errno.h> 37204917Sdes#ifdef HAVE_POLL_H 38204917Sdes#include <poll.h> 39204917Sdes#endif 40162852Sdes#include <string.h> 41162852Sdes#include <stdarg.h> 42162852Sdes 4398675Sdes#include "log.h" 4498675Sdes#include "monitor_fdpass.h" 4598675Sdes 46181111Sdesint 47137015Sdesmm_send_fd(int sock, int fd) 4898675Sdes{ 4998937Sdes#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR)) 5098675Sdes struct msghdr msg; 5198937Sdes#ifndef HAVE_ACCRIGHTS_IN_MSGHDR 52180989Sdes union { 53180989Sdes struct cmsghdr hdr; 54180989Sdes char buf[CMSG_SPACE(sizeof(int))]; 55180989Sdes } cmsgbuf; 5698937Sdes struct cmsghdr *cmsg; 5798937Sdes#endif 58192595Sdes struct iovec vec; 59192595Sdes char ch = '\0'; 60192595Sdes ssize_t n; 61204917Sdes struct pollfd pfd; 6298675Sdes 6398675Sdes memset(&msg, 0, sizeof(msg)); 6498937Sdes#ifdef HAVE_ACCRIGHTS_IN_MSGHDR 6598937Sdes msg.msg_accrights = (caddr_t)&fd; 6698937Sdes msg.msg_accrightslen = sizeof(fd); 6798937Sdes#else 68180989Sdes msg.msg_control = (caddr_t)&cmsgbuf.buf; 69180989Sdes msg.msg_controllen = sizeof(cmsgbuf.buf); 7098675Sdes cmsg = CMSG_FIRSTHDR(&msg); 7198675Sdes cmsg->cmsg_len = CMSG_LEN(sizeof(int)); 7298675Sdes cmsg->cmsg_level = SOL_SOCKET; 7398675Sdes cmsg->cmsg_type = SCM_RIGHTS; 7498675Sdes *(int *)CMSG_DATA(cmsg) = fd; 7598937Sdes#endif 7698675Sdes 7798675Sdes vec.iov_base = &ch; 7898675Sdes vec.iov_len = 1; 7998675Sdes msg.msg_iov = &vec; 8098675Sdes msg.msg_iovlen = 1; 8198675Sdes 82204917Sdes pfd.fd = sock; 83204917Sdes pfd.events = POLLOUT; 84204917Sdes while ((n = sendmsg(sock, &msg, 0)) == -1 && 85204917Sdes (errno == EAGAIN || errno == EINTR)) { 86192595Sdes debug3("%s: sendmsg(%d): %s", __func__, fd, strerror(errno)); 87204917Sdes (void)poll(&pfd, 1, -1); 88204917Sdes } 89192595Sdes if (n == -1) { 90181111Sdes error("%s: sendmsg(%d): %s", __func__, fd, 9198675Sdes strerror(errno)); 92181111Sdes return -1; 93181111Sdes } 94181111Sdes 95181111Sdes if (n != 1) { 96181111Sdes error("%s: sendmsg: expected sent 1 got %ld", 97106121Sdes __func__, (long)n); 98181111Sdes return -1; 99181111Sdes } 100181111Sdes return 0; 10198937Sdes#else 102181111Sdes error("%s: file descriptor passing not supported", __func__); 103181111Sdes return -1; 10498937Sdes#endif 10598675Sdes} 10698675Sdes 10798675Sdesint 108137015Sdesmm_receive_fd(int sock) 10998675Sdes{ 11098937Sdes#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR)) 11198675Sdes struct msghdr msg; 11298937Sdes#ifndef HAVE_ACCRIGHTS_IN_MSGHDR 113180989Sdes union { 114180989Sdes struct cmsghdr hdr; 115180989Sdes char buf[CMSG_SPACE(sizeof(int))]; 116180989Sdes } cmsgbuf; 11798937Sdes struct cmsghdr *cmsg; 11898937Sdes#endif 119192595Sdes struct iovec vec; 120192595Sdes ssize_t n; 121192595Sdes char ch; 122192595Sdes int fd; 123204917Sdes struct pollfd pfd; 12498675Sdes 12598675Sdes memset(&msg, 0, sizeof(msg)); 12698675Sdes vec.iov_base = &ch; 12798675Sdes vec.iov_len = 1; 12898675Sdes msg.msg_iov = &vec; 12998675Sdes msg.msg_iovlen = 1; 13098937Sdes#ifdef HAVE_ACCRIGHTS_IN_MSGHDR 13198937Sdes msg.msg_accrights = (caddr_t)&fd; 13298937Sdes msg.msg_accrightslen = sizeof(fd); 13398937Sdes#else 134180989Sdes msg.msg_control = &cmsgbuf.buf; 135180989Sdes msg.msg_controllen = sizeof(cmsgbuf.buf); 13698937Sdes#endif 13798675Sdes 138204917Sdes pfd.fd = sock; 139204917Sdes pfd.events = POLLIN; 140204917Sdes while ((n = recvmsg(sock, &msg, 0)) == -1 && 141204917Sdes (errno == EAGAIN || errno == EINTR)) { 142192595Sdes debug3("%s: recvmsg: %s", __func__, strerror(errno)); 143204917Sdes (void)poll(&pfd, 1, -1); 144204917Sdes } 145192595Sdes if (n == -1) { 146181111Sdes error("%s: recvmsg: %s", __func__, strerror(errno)); 147181111Sdes return -1; 148181111Sdes } 149192595Sdes 150181111Sdes if (n != 1) { 151181111Sdes error("%s: recvmsg: expected received 1 got %ld", 152106121Sdes __func__, (long)n); 153181111Sdes return -1; 154181111Sdes } 15598675Sdes 15698937Sdes#ifdef HAVE_ACCRIGHTS_IN_MSGHDR 157181111Sdes if (msg.msg_accrightslen != sizeof(fd)) { 158181111Sdes error("%s: no fd", __func__); 159181111Sdes return -1; 160181111Sdes } 16198937Sdes#else 16298675Sdes cmsg = CMSG_FIRSTHDR(&msg); 163181111Sdes if (cmsg == NULL) { 164181111Sdes error("%s: no message header", __func__); 165181111Sdes return -1; 166181111Sdes } 167192595Sdes 168124208Sdes#ifndef BROKEN_CMSG_TYPE 169181111Sdes if (cmsg->cmsg_type != SCM_RIGHTS) { 170181111Sdes error("%s: expected type %d got %d", __func__, 17198675Sdes SCM_RIGHTS, cmsg->cmsg_type); 172181111Sdes return -1; 173181111Sdes } 174124208Sdes#endif 17598675Sdes fd = (*(int *)CMSG_DATA(cmsg)); 17698937Sdes#endif 17798675Sdes return fd; 17898937Sdes#else 179181111Sdes error("%s: file descriptor passing not supported", __func__); 180181111Sdes return -1; 18198937Sdes#endif 18298675Sdes} 183