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Diffstat (limited to 'netcon/NetconUtilities.cpp')
| -rw-r--r-- | netcon/NetconUtilities.cpp | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/netcon/NetconUtilities.cpp b/netcon/NetconUtilities.cpp new file mode 100644 index 00000000..584c4944 --- /dev/null +++ b/netcon/NetconUtilities.cpp @@ -0,0 +1,165 @@ + +/* + * ZeroTier One - Network Virtualization Everywhere + * Copyright (C) 2011-2015 ZeroTier, Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * -- + * + * ZeroTier may be used and distributed under the terms of the GPLv3, which + * are available at: http://www.gnu.org/licenses/gpl-3.0.html + * + * If you would like to embed ZeroTier into a commercial application or + * redistribute it in a modified binary form, please contact ZeroTier Networks + * LLC. Start here: http://www.zerotier.com/ + */ + + +#include <stdlib.h> +#include <unistd.h> +#include <stdio.h> +#include <sys/socket.h> + +#include "lwip/ip.h" +#include "lwip/ip_addr.h" +#include "lwip/ip_frag.h" + +#ifndef _NETCON_UTILITIES_CPP +#define _NETCON_UTILITIES_CPP + +namespace ZeroTier +{ + /* + ip_addr_t convert_ip(struct sockaddr_in * addr) + { + ip_addr_t conn_addr; + struct sockaddr_in *ipv4 = addr; + short a = ip4_addr1(&(ipv4->sin_addr)); + short b = ip4_addr2(&(ipv4->sin_addr)); + short c = ip4_addr3(&(ipv4->sin_addr)); + short d = ip4_addr4(&(ipv4->sin_addr)); + IP4_ADDR(&conn_addr, a,b,c,d); + return conn_addr; + } +*/ + +/* + ip_addr_t ip_addr_sin(register struct sockaddr_in *sin) { + ip_addr_t ip; + *((struct sockaddr_in*) &ip) = *sin; + return ip; + } +*/ + // Functions used to pass file descriptors between processes + + ssize_t sock_fd_write(int sock, int fd) + { + ssize_t size; + struct msghdr msg; + struct iovec iov; + char buf = '\0'; + int buflen = 1; + + union + { + struct cmsghdr cmsghdr; + char control[CMSG_SPACE(sizeof (int))]; + } cmsgu; + struct cmsghdr *cmsg; + + iov.iov_base = &buf; + iov.iov_len = buflen; + + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + + if (fd != -1) { + msg.msg_control = cmsgu.control; + msg.msg_controllen = sizeof(cmsgu.control); + 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 { + msg.msg_control = NULL; + msg.msg_controllen = 0; + } + + size = sendmsg(sock, &msg, 0); + if (size < 0) + perror ("sendmsg"); + return size; + } + + + ssize_t sock_fd_read(int sock, void *buf, ssize_t bufsize, int *fd) + { + ssize_t size; + + if (fd) { + struct msghdr msg; + struct iovec iov; + union + { + struct cmsghdr cmsghdr; + char control[CMSG_SPACE(sizeof (int))]; + } cmsgu; + struct cmsghdr *cmsg; + + iov.iov_base = buf; + iov.iov_len = bufsize; + + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = cmsgu.control; + msg.msg_controllen = sizeof(cmsgu.control); + size = recvmsg (sock, &msg, 0); + if (size < 0) { + perror ("recvmsg"); + exit(1); + } + cmsg = CMSG_FIRSTHDR(&msg); + if (cmsg && cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { + if (cmsg->cmsg_level != SOL_SOCKET) { + fprintf (stderr, "invalid cmsg_level %d\n", + cmsg->cmsg_level); + exit(1); + } + if (cmsg->cmsg_type != SCM_RIGHTS) { + fprintf (stderr, "invalid cmsg_type %d\n", + cmsg->cmsg_type); + exit(1); + } + + *fd = *((int *) CMSG_DATA(cmsg)); + } else + *fd = -1; + } else { + size = read (sock, buf, bufsize); + if (size < 0) { + perror("read"); + exit(1); + } + } + return size; + } +} + +#endif |