mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-30 01:38:53 +00:00
132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
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/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2015 ZeroTier, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <sys/socket.h>
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/* Functions used to pass file descriptors between processes */
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ssize_t sock_fd_write(int sock, int fd);
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ssize_t sock_fd_read(int sock, void *buf, ssize_t bufsize, int *fd);
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ssize_t sock_fd_write(int sock, int fd)
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{
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ssize_t size;
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struct msghdr msg;
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struct iovec iov;
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char buf = '\0';
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int buflen = 1;
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union {
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struct cmsghdr cmsghdr;
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char control[CMSG_SPACE(sizeof (int))];
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} cmsgu;
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struct cmsghdr *cmsg;
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iov.iov_base = &buf;
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iov.iov_len = buflen;
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msg.msg_name = NULL;
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msg.msg_namelen = 0;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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if (fd != -1) {
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msg.msg_control = cmsgu.control;
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msg.msg_controllen = sizeof(cmsgu.control);
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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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} else {
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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}
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size = sendmsg(sock, &msg, 0);
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if (size < 0)
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perror ("sendmsg");
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return size;
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}
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ssize_t sock_fd_read(int sock, void *buf, ssize_t bufsize, int *fd)
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{
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ssize_t size;
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if (fd) {
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struct msghdr msg;
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struct iovec iov;
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union {
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struct cmsghdr cmsghdr;
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char control[CMSG_SPACE(sizeof (int))];
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} cmsgu;
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struct cmsghdr *cmsg;
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iov.iov_base = buf;
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iov.iov_len = bufsize;
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msg.msg_name = NULL;
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msg.msg_namelen = 0;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = cmsgu.control;
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msg.msg_controllen = sizeof(cmsgu.control);
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size = recvmsg (sock, &msg, 0);
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if (size < 0) {
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perror ("recvmsg");
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exit(1);
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}
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cmsg = CMSG_FIRSTHDR(&msg);
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if (cmsg && cmsg->cmsg_len == CMSG_LEN(sizeof(int))) {
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if (cmsg->cmsg_level != SOL_SOCKET) {
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fprintf (stderr, "invalid cmsg_level %d\n",
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cmsg->cmsg_level);
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exit(1);
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}
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if (cmsg->cmsg_type != SCM_RIGHTS) {
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fprintf (stderr, "invalid cmsg_type %d\n",
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cmsg->cmsg_type);
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exit(1);
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}
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*fd = *((int *) CMSG_DATA(cmsg));
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} else
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*fd = -1;
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} else {
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size = read (sock, buf, bufsize);
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if (size < 0) {
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perror("read");
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exit(1);
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}
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}
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return size;
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}
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