NetBSD/sbin/mount_portal/activate.c

226 lines
5.2 KiB
C

/* $NetBSD: activate.c,v 1.15 2009/04/11 07:36:43 lukem Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Id: activate.c,v 1.2 1992/05/27 07:09:27 jsp Exp
* @(#)activate.c 8.3 (Berkeley) 4/28/95
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: activate.c,v 1.15 2009/04/11 07:36:43 lukem Exp $");
#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/syslog.h>
#include <sys/uio.h>
#include "portald.h"
static int get_request(int, struct portal_cred *, char *, size_t);
static void send_reply(int, int, int);
/*
* Scan the providers list and call the
* appropriate function.
*/
int
activate_argv(struct portal_cred *pcr, char *key, char **v, int *fdp)
{
provider *pr;
for (pr = providers; pr->pr_match; pr++)
if (strcmp(v[0], pr->pr_match) == 0)
return ((*pr->pr_func)(pcr, key, v, fdp));
return (ENOENT);
}
static int
get_request(int so, struct portal_cred *pcr, char *key, size_t klen)
{
struct iovec iov[2];
struct msghdr msg;
ssize_t n;
iov[0].iov_base = (caddr_t) pcr;
iov[0].iov_len = sizeof(*pcr);
iov[1].iov_base = key;
iov[1].iov_len = klen;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = iov;
msg.msg_iovlen = 2;
n = recvmsg(so, &msg, 0);
if (n < 0)
return (errno);
if (n <= (ssize_t)sizeof(*pcr))
return (EINVAL);
n -= sizeof(*pcr);
key[n] = '\0';
return (0);
}
static void
send_reply(int so, int fd, int error)
{
int n;
struct iovec iov;
struct msghdr msg;
void *ctl = NULL;
struct cmsghdr *cmsg;
int *files;
socklen_t cmsgsize;
/*
* Line up error code. Don't worry about byte ordering
* because we must be sending to the local machine.
*/
iov.iov_base = (caddr_t) &error;
iov.iov_len = sizeof(error);
/*
* Build a msghdr
*/
memset(&msg, 0, sizeof(msg));
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
/*
* If there is a file descriptor to send then
* construct a suitable rights control message.
*/
if (fd >= 0) {
cmsgsize = CMSG_LEN(sizeof(*files));
ctl = malloc(cmsgsize);
if (ctl == NULL) {
syslog(LOG_WARNING, "malloc control message: %m");
return;
}
memset(ctl, 0, cmsgsize);
cmsg = (struct cmsghdr *) ctl;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
files = (int *)CMSG_DATA(cmsg);
files[0] = fd;
msg.msg_control = ctl;
msg.msg_controllen = cmsgsize;
}
/*
* Send to kernel...
*/
if ((n = sendmsg(so, &msg, MSG_EOR)) < 0)
syslog(LOG_WARNING, "send: %m");
#ifdef DEBUG
fprintf(stderr, "sent %d bytes\n", n);
#endif
sleep(1); /*XXX*/
#ifdef notdef
if (shutdown(so, 2) < 0)
syslog(LOG_WARNING, "shutdown: %m");
#endif
/*
* Throw away the open file descriptor and control
* message buffer.
*/
if (fd >= 0)
(void) close(fd);
if (ctl != NULL)
free(ctl);
}
void
activate(qelem *q, int so)
{
struct portal_cred pcred;
char key[MAXPATHLEN+1];
int error;
char **v;
int fd = -1;
/*
* Read the key from the socket
*/
error = get_request(so, &pcred, key, sizeof(key));
if (error) {
syslog(LOG_WARNING, "activate: recvmsg: %m");
goto drop;
}
#ifdef DEBUG
fprintf(stderr, "lookup key %s\n", key);
#endif
/*
* Find a match in the configuration file
*/
v = conf_match(q, key);
/*
* If a match existed, then find an appropriate portal
* otherwise simply return ENOENT.
*/
if (v) {
error = activate_argv(&pcred, key, v, &fd);
if (error)
fd = -1;
else if (fd < 0)
error = -1;
} else
error = ENOENT;
if (error >= 0)
send_reply(so, fd, error);
drop:;
close(so);
}