path: root/usr/src/cmd/fs.d/autofs/autod_autofs.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 *	autod_autofs.c
 *
 *	Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 *	Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mntent.h>
#include <sys/mnttab.h>
#include <sys/mount.h>
#include <sys/utsname.h>
#include <sys/tiuser.h>
#include <syslog.h>
#include <string.h>
#include <errno.h>
#include <fslib.h>
#include <sys/vfs.h>
#include <assert.h>
#include "automount.h"

static int process_opts(char *options, int *directp, int *sawnestp);
void netbuf_free(struct netbuf *);

int
mount_autofs(
	struct mapent *me,
	char *mntpnt,
	action_list *alp,
	char *rootp,
	char *subdir,
	char *key
)
{
	int mntflags = 0;
	struct utsname utsname;
	autofs_args *fnip = NULL;
	int mount_timeout = AUTOFS_MOUNT_TIMEOUT;
	int sawnest, len, error = 0;
	char *buf, rel_mntpnt[MAXPATHLEN];

	if (trace > 1)
		trace_prt(1, "  mount_autofs %s on %s\n",
		me->map_fs->mfs_dir, mntpnt);

	if (strcmp(mntpnt, "/-") == 0) {
		syslog(LOG_ERR, "invalid mountpoint: /-");
		return (ENOENT);
	}

	/*
	 * get relative mountpoint
	 */
	sprintf(rel_mntpnt, ".%s", mntpnt+strlen(rootp));

	if (trace > 2)
		trace_prt(1, "rel_mntpnt = %s\n", rel_mntpnt);

	if (uname(&utsname) < 0) {
		error = errno;
		syslog(LOG_ERR, "uname %s", strerror(error));
		return (error);
	}

	if ((fnip = (autofs_args *)
	    malloc(sizeof (autofs_args))) == NULL) {
		goto free_mem;
	}
	(void) memset((void *) fnip, 0, sizeof (*fnip));

	if ((fnip->addr.buf = (char *)malloc(MAXADDRLEN)) == NULL)
		goto free_mem;

	(void) strcpy(fnip->addr.buf, utsname.nodename);
	(void) strcat(fnip->addr.buf, ".autofs");

	if ((fnip->opts = malloc(MAX_MNTOPT_STR)) == NULL)
		goto free_mem;
	strcpy(fnip->opts, me->map_mntopts);

	if (process_opts(fnip->opts, &fnip->direct, &sawnest) != 0)
		goto free_mem;

	fnip->addr.len = strlen(fnip->addr.buf);
	fnip->addr.maxlen = fnip->addr.len;

	/*
	 * get absolute mountpoint
	 */
	if ((fnip->path = strdup(mntpnt)) == NULL)
		goto free_mem;
	if ((fnip->map = strdup(me->map_fs->mfs_dir)) == NULL)
		goto free_mem;
	if ((fnip->subdir = strdup(subdir)) == NULL)
		goto free_mem;

	/*
	 * This timeout is really ignored by autofs, it uses the
	 * parent directory's timeout since it's really the one
	 * specified/inherited from the original mount by 'automount'
	 */
	fnip->mount_to = mount_timeout;	/* IGNORED */
	fnip->rpc_to = AUTOFS_RPC_TIMEOUT;

	if (fnip->direct) {
		if (me->map_modified == TRUE || me->map_faked == TRUE) {
			if ((fnip->key = strdup(key)) == NULL)
				goto free_mem;
		} else {
			/* wierd case of a direct map pointer in another map */
			if ((fnip->key = strdup(fnip->path)) == NULL)
				goto free_mem;
		}
	} else {
		fnip->key = NULL;
	}

	/*
	 * Fill out action list.
	 */
	alp->action.action = AUTOFS_MOUNT_RQ;
	if ((alp->action.action_list_entry_u.mounta.spec =
	    strdup(me->map_fs->mfs_dir)) == NULL)
		goto free_mem;
	if ((alp->action.action_list_entry_u.mounta.dir =
	    strdup(rel_mntpnt)) == NULL)
		goto free_mem;

	len = strlen(fnip->opts);
	/*
	 * Get a buffer for the option string, it holds the map options plus
	 * space for "nest" if it isn't already in the option string
	 */
	if ((buf = (char *)malloc(MAX_MNTOPT_STR)) == NULL)
		goto free_mem;
	strcpy(buf, fnip->opts);
	if (!sawnest) {
		if (len + strlen(",nest") + 1 > MAX_MNTOPT_STR)
			goto free_mem;
		if (len)
			(void) strcat(buf, ",");
		(void) strcat(buf, "nest");
	}
	alp->action.action_list_entry_u.mounta.optptr = buf;
	alp->action.action_list_entry_u.mounta.optlen = strlen(buf) + 1;
	alp->action.action_list_entry_u.mounta.flags =
		mntflags | MS_DATA | MS_OPTIONSTR;
	if ((alp->action.action_list_entry_u.mounta.fstype =
	    strdup(MNTTYPE_AUTOFS)) == NULL)
		goto free_mem;
	alp->action.action_list_entry_u.mounta.dataptr = (char *)fnip;
	alp->action.action_list_entry_u.mounta.datalen = sizeof (*fnip);

	return (0);

free_mem:
	/*
	 * We got an error, free the memory we allocated.
	 */
	syslog(LOG_ERR, "mount_autofs: memory allocation failure");
	free_autofs_args(fnip);
	alp->action.action_list_entry_u.mounta.dataptr = NULL;
	alp->action.action_list_entry_u.mounta.datalen = 0;
	free_mounta(&alp->action.action_list_entry_u.mounta);

	return (error ? error : ENOMEM);
}

/*
 * Set *directp to 1 if "direct" is found, and 0 otherwise
 * (mounts are indirect by default).  If both "direct" and "indirect" are
 * found, the last one wins.
 */
static int
process_opts(char *options, int *directp, int *sawnestp)
{
	char *opt, *opts, *lasts;
	char buf[AUTOFS_MAXOPTSLEN];

	assert(strlen(options)+1 < AUTOFS_MAXOPTSLEN);

	*sawnestp = 0;
	strcpy(buf, options);
	opts = buf;
	options[0] = '\0';
	*directp = 0;

	while ((opt = strtok_r(opts, ",", &lasts)) != NULL) {
		opts = NULL;
		while (isspace(*opt)) {
			opt++;
		}
		if (strcmp(opt, "direct") == 0) {
			*directp = 1;
		} else if (strcmp(opt, "indirect") == 0) {
			*directp = 0;
		} else if (strcmp(opt, "ignore") != 0) {
			if (strcmp(opt, "nest") == 0) {
				*sawnestp = 1;
			}
			if (options[0] != '\0') {
				(void) strcat(options, ",");
			}
			(void) strcat(options, opt);
		}
	};
	return (0);
}

/*
 * Free autofs_args structure
 */
void
free_autofs_args(autofs_args *p)
{
	if (p == NULL)
		return;
	if (p->addr.buf)
		free(p->addr.buf);
	if (p->path)
		free(p->path);
	if (p->opts)
		free(p->opts);
	if (p->map)
		free(p->map);
	if (p->subdir)
		free(p->subdir);
	if (p->key)
		free(p->key);
	free(p);
}

/*
 * free mounta structure. Assumes that m->dataptr has
 * been freed already
 */
void
free_mounta(struct mounta *m)
{
	if (m == NULL)
		return;
	if (m->spec)
		free(m->spec);
	if (m->dir)
		free(m->dir);
	if (m->fstype)
		free(m->fstype);
	if (m->optptr)
		free(m->optptr);
	assert(m->dataptr == NULL);
	assert(m->datalen == 0);
	/*
	 * no need to free 'm' since it is part of the
	 * action_list_entry structure.
	 */
}