116 lines
3.5 KiB
C
116 lines
3.5 KiB
C
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/*
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* Copyright (C) 2014 Glyptodon LLC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config.h"
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#include "move-fd.h"
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/* Required for CMSG_* macros on BSD */
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#define __BSD_VISIBLE 1
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <unistd.h>
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int guacd_send_fd(int sock, int fd) {
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struct msghdr message = {0};
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char message_data[] = {'G'};
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/* Assign data buffer */
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struct iovec io_vector[1];
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io_vector[0].iov_base = message_data;
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io_vector[0].iov_len = sizeof(message_data);
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message.msg_iov = io_vector;
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message.msg_iovlen = 1;
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/* Assign ancillary data buffer */
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char buffer[CMSG_SPACE(sizeof(fd))];
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message.msg_control = buffer;
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message.msg_controllen = sizeof(buffer);
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/* Set fields of control message header */
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struct cmsghdr* control = CMSG_FIRSTHDR(&message);
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control->cmsg_level = SOL_SOCKET;
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control->cmsg_type = SCM_RIGHTS;
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control->cmsg_len = CMSG_LEN(sizeof(fd));
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/* Add file descriptor to message data */
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memcpy(CMSG_DATA(control), &fd, sizeof(fd));
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/* Send file descriptor */
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return (sendmsg(sock, &message, 0) == sizeof(message_data));
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}
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int guacd_recv_fd(int sock) {
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int fd;
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struct msghdr message = {0};
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char message_data[1];
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/* Assign data buffer */
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struct iovec io_vector[1];
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io_vector[0].iov_base = message_data;
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io_vector[0].iov_len = sizeof(message_data);
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message.msg_iov = io_vector;
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message.msg_iovlen = 1;
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/* Assign ancillary data buffer */
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char buffer[CMSG_SPACE(sizeof(fd))];
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message.msg_control = buffer;
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message.msg_controllen = sizeof(buffer);
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/* Receive file descriptor */
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if (recvmsg(sock, &message, 0) == sizeof(message_data)) {
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/* Validate payload */
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if (message_data[0] != 'G') {
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errno = EPROTO;
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return -1;
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}
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/* Iterate control headers, looking for the sent file descriptor */
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struct cmsghdr* control;
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for (control = CMSG_FIRSTHDR(&message); control != NULL; control = CMSG_NXTHDR(&message, control)) {
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/* Pull file descriptor from data */
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if (control->cmsg_level == SOL_SOCKET && control->cmsg_type == SCM_RIGHTS) {
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memcpy(&fd, CMSG_DATA(control), sizeof(fd));
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return fd;
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}
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}
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} /* end if recvmsg() success */
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/* Failed to receive file descriptor */
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return -1;
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}
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