/* * Copyright 2001 Niels Provos * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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 AUTHOR ``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 AUTHOR 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 "log.h" #include "monitor.h" int mm_send_fd(int socket, int fd) { struct msghdr msg; char tmp[CMSG_SPACE(sizeof(int))], ch = '\0'; struct cmsghdr *cmsg; struct iovec vec; ssize_t n; 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; vec.iov_base = &ch; vec.iov_len = 1; msg.msg_iov = &vec; msg.msg_iovlen = 1; if ((n = sendmsg(socket, &msg, 0)) == -1) { log_error("mm_send_fd: sendmsg(%d)", fd); return -1; } if (n != 1) { log_error("mm_send_fd: sendmsg: expected sent 1 got %ld", (long)n); return -1; } return 0; } int mm_receive_fd(int socket) { struct msghdr msg; char tmp[CMSG_SPACE(sizeof(int))], ch; struct cmsghdr *cmsg; struct iovec vec; ssize_t n; int fd; memset(&msg, 0, sizeof msg); vec.iov_base = &ch; vec.iov_len = 1; msg.msg_iov = &vec; msg.msg_iovlen = 1; msg.msg_control = tmp; msg.msg_controllen = sizeof tmp; if ((n = recvmsg(socket, &msg, 0)) == -1) { log_error("mm_receive_fd: recvmsg"); return -1; } if (n != 1) { log_error("mm_receive_fd: recvmsg: expected received 1 got %ld", (long)n); return -1; } cmsg = CMSG_FIRSTHDR(&msg); if (cmsg == NULL) { log_error("mm_receive_fd: no message header"); return -1; } if (cmsg->cmsg_type != SCM_RIGHTS) { log_error("mm_receive_fd: expected type %d got %d", SCM_RIGHTS, cmsg->cmsg_type); return -1; } fd = (*(int *)CMSG_DATA(cmsg)); return fd; }