123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
/*
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* Copyright © 2012 Keith Packard <keithp@keithp.com>
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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; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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#include "fdpass.h"
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ssize_t
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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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if ((msg.msg_flags & MSG_TRUNC) ||
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(msg.msg_flags & MSG_CTRUNC)) {
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fprintf (stderr, "control message truncated");
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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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printf ("received fd %d\n", *fd);
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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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ssize_t
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sock_fd_write(int sock, void *buf, ssize_t buflen, 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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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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printf ("passing fd %d\n", fd);
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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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printf ("not passing fd\n");
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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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