Function unp_internalize

freebsd/kern/uipc_usrreq.c:2192–2387

}

static int
unp_internalize(struct mbuf **controlp, struct thread *td)
{
	struct mbuf *control, **initial_controlp;
	struct proc *p;
	struct filedesc *fdesc;
	struct bintime *bt;
	struct cmsghdr *cm;
	struct cmsgcred *cmcred;
	struct filedescent *fde, **fdep, *fdev;
	struct file *fp;
	struct timeval *tv;
	struct timespec *ts;
	void *data;
	socklen_t clen, datalen;
	int i, j, error, *fdp, oldfds;
	u_int newlen;

	UNP_LINK_UNLOCK_ASSERT();

	p = td->td_proc;
	fdesc = p->p_fd;
	error = 0;
	control = *controlp;
	clen = control->m_len;
	*controlp = NULL;
	initial_controlp = controlp;
	for (cm = mtod(control, struct cmsghdr *); cm != NULL;) {
		if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
		    || cm->cmsg_len > clen || cm->cmsg_len < sizeof(*cm)) {
			error = EINVAL;
			goto out;
		}
		data = CMSG_DATA(cm);
		datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;

		switch (cm->cmsg_type) {
		/*
		 * Fill in credential information.
		 */
		case SCM_CREDS:
			*controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
			    SCM_CREDS, SOL_SOCKET);
			if (*controlp == NULL) {
				error = ENOBUFS;
				goto out;
			}
			cmcred = (struct cmsgcred *)
			    CMSG_DATA(mtod(*controlp, struct cmsghdr *));
			cmcred->cmcred_pid = p->p_pid;
			cmcred->cmcred_uid = td->td_ucred->cr_ruid;
			cmcred->cmcred_gid = td->td_ucred->cr_rgid;
			cmcred->cmcred_euid = td->td_ucred->cr_uid;
			cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
			    CMGROUP_MAX);
			for (i = 0; i < cmcred->cmcred_ngroups; i++)
				cmcred->cmcred_groups[i] =
				    td->td_ucred->cr_groups[i];