@@ -91,6 +91,82 @@ static void chroot_read_request(int sockfd, V9fsFileObjectRequest *request)
}
}
+/* Receive file descriptor and error status from chroot process */
+static int v9fs_receivefd(int sockfd, int *error)
+{
+ struct msghdr msg = { };
+ struct iovec iov;
+ union MsgControl msg_control;
+ struct cmsghdr *cmsg;
+ int retval, fd;
+ FdInfo fd_info;
+
+ iov.iov_base = &fd_info;
+ iov.iov_len = sizeof(fd_info);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = &msg_control;
+ msg.msg_controllen = sizeof(msg_control);
+
+ retval = recvmsg(sockfd, &msg, 0);
+ if (retval < 0) {
+ error_report("recvmsg: %s", strerror(errno));
+ exit(1);
+ }
+
+ /* If error is set, ancillary data is not present */
+ if (fd_info.fi_error) {
+ *error = fd_info.fi_error;
+ return -1;
+ }
+
+ for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)) ||
+ cmsg->cmsg_level != SOL_SOCKET ||
+ cmsg->cmsg_type != SCM_RIGHTS) {
+ continue;
+ }
+ fd = *((int *)CMSG_DATA(cmsg));
+ return fd;
+ }
+
+ *error = EAGAIN;
+ return -1;
+}
+
+/*
+ * V9fsFileObjectRequest is written into the socket by QEMU process.
+ * Then this request is read by chroot process using read_request function
+ */
+static void v9fs_write_request(int sockfd, V9fsFileObjectRequest *request)
+{
+ int retval;
+
+ retval = qemu_write_full(sockfd, &request->data,
+ sizeof(request->data));
+ if (retval < 0) {
+ error_report("socket write failed: %s", strerror(errno));
+ exit(-1);
+ }
+
+ retval = qemu_write_full(sockfd, request->path.path,
+ request->data.path_len);
+ if (retval < 0) {
+ error_report("socket write failed: %s", strerror(errno));
+ exit(-1);
+ }
+ if (request->data.oldpath_len > 0) {
+ retval = qemu_write_full(sockfd, request->path.old_path,
+ request->data.oldpath_len);
+ if (retval < 0) {
+ error_report("socket write failed: %s", strerror(errno));
+ exit(-1);
+ }
+ }
+}
+
static int chroot_daemonize(int chroot_sock)
{
sigset_t sigset;
@@ -122,6 +198,8 @@ static int chroot_daemonize(int chroot_sock)
static void chroot_dummy(void)
{
(void)chroot_sendfd;
+ (void)v9fs_receivefd;
+ (void)v9fs_write_request;
}
/*
Define QEMU side interfaces used for chroot environment. Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> --- hw/9pfs/virtio-9p-chroot.c | 78 ++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 78 insertions(+), 0 deletions(-)