xref: /illumos-gate/usr/src/cmd/ttymon/tmutil.c (revision 3bb2c156)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved	*/

#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <ctype.h>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/stropts.h>
#include <sys/sad.h>
#include "ttymon.h"
#include "tmstruct.h"
#include "tmextern.h"

#define	NSTRPUSH	9	/* should agree with the tunable in	*/
				/* /etc/master.d/kernel			*/

/*
 *	check_device - check to see if the device exists,
 *		     - and if it is a character device
 *		     - return 0 if everything is ok. Otherwise, return -1
 */
int
check_device(char *device)
{
	struct stat statbuf;

	if ((device == NULL) || (*device == '\0')) {
		log("error -- device field is missing");
		return (-1);
	}
	if (*device != '/') {
		log("error -- must specify full path name for \"%s\".", device);
		return (-1);
	}
	if (access(device, 0) == 0) {
		if (stat(device, &statbuf) < 0) {
			log("stat(%s) failed: %s", device, strerror(errno));
			return (-1);
		}
		if ((statbuf.st_mode & S_IFMT) != S_IFCHR) {
			log("error -- \"%s\" not character special device",
			    device);
			return (-1);
		}
	} else {
		log("error -- device \"%s\" does not exist", device);
		return (-1);
	}
	return (0);
}

/*
 *	check_cmd - check to see if the cmd file exists,
 *		  - and if it is executable
 *		  - return 0 if everything is ok. Otherwise, return -1
 */
int
check_cmd(char *cmd)
{
	struct stat statbuf;
	char	tbuf[BUFSIZ];
	char	*tp = tbuf;

	if ((cmd == NULL) || (*cmd == '\0')) {
		log("error -- server command is missing");
		return (-1);
	}
	(void) strcpy(tp, cmd);
	(void) strtok(tp, " \t");
	if (*tp != '/') {
		log("error -- must specify full path name for \"%s\".", tp);
		return (-1);
	}
	if (access(tp, 0) == 0) {
		if (stat(tp, &statbuf) < 0) {
			log("stat(%s) failed.", tp);
			return (-1);
		}
		if (!(statbuf.st_mode & 0111)) {
			log("error -- \"%s\" not executable\n", tp);
			return (-1);
		}
		if ((statbuf.st_mode & S_IFMT) != S_IFREG) {
			log("error -- \"%s\" not a regular file", tp);
			return (-1);
		}
	} else {
		log("error -- \"%s\" does not exist", tp);
		return (-1);
	}
	return (0);
}

/*
 * strcheck(sp, flag)	- check string
 *				- if flag == ALNUM, all char. are expected to
 *				  be alphanumeric
 *				- if flag == NUM, all char. are expected to
 *				  be digits and the number must be >= 0
 *				- return 0 if successful, -1 if failed.
 */
int
strcheck(char *sp, int flag)
{
	char	*cp;

	if (flag == NUM) {
		for (cp = sp; *cp; cp++) {
			if (!isdigit(*cp)) {
				return (-1);
			}
		}
	} else {	/* (flag == ALNUM) */
		for (cp = sp; *cp; cp++) {
			if (!isalnum(*cp)) {
				return (-1);
			}
		}
	}
	return (0);
}

/*
 * vml(modules)	- validate a list of modules
 *		- return 0 if successful, -1 if failed
 */
int
vml(char *modules)
{
	char	*modp, *svmodp;
	int	i, fd;
	struct str_mlist newmods[NSTRPUSH];	/* modlist for newlist	*/
	struct str_list	newlist;		/* modules to be pushed	*/

	if ((modules == NULL) || (*modules == '\0'))
		return (0);

	newlist.sl_modlist = newmods;
	newlist.sl_nmods = NSTRPUSH;
	if ((modp = malloc(strlen(modules) + 1)) == NULL) {
		log("vml: malloc failed");
		return (-1);
	};
	svmodp = modp;
	(void) strcpy(modp, modules);
	/*
	 * pull mod names out of comma-separated list
	 */
	for (i = 0, modp = strtok(modp, ",");
	    modp != NULL; i++, modp = strtok(NULL, ",")) {
		if (i >= NSTRPUSH) {
			log("too many modules in <%s>", modules);
			i = -1;
			break;
		}
		(void) strncpy(newlist.sl_modlist[i].l_name, modp, FMNAMESZ);
		newlist.sl_modlist[i].l_name[FMNAMESZ] = '\0';
	}
	free(svmodp);
	if (i == -1)
		return (-1);
	newlist.sl_nmods = i;

	/*
	 * Is it a valid list of modules?
	 */
	if ((fd = open(USERDEV, O_RDWR)) == -1) {
		if (errno == EBUSY) {
			log("Warning - can't validate module list, "
			    "/dev/sad/user busy");
			return (0);
		}
		log("open /dev/sad/user failed: %s", strerror(errno));
		return (-1);
	}
	if ((i = ioctl(fd, SAD_VML, &newlist)) < 0) {
		log("Validate modules ioctl failed, modules = <%s>: %s",
		    modules, strerror(errno));
		(void) close(fd);
		return (-1);
	}
	if (i != 0) {
		log("Error - invalid STREAMS module list <%s>.", modules);
		(void) close(fd);
		return (-1);
	}
	(void) close(fd);
	return (0);
}

/*
 * copystr(s1, s2) - copy string s2 to string s1
 *		   - also put '\' in front of ':'
 */
void
copystr(char *s1, char *s2)
{
	while (*s2) {
		if (*s2 == ':') {
			*s1++ = '\\';
		}
		*s1++ = *s2++;
	}
	*s1 = '\0';
}

/*PRINTFLIKE1*/
void
cons_printf(const char *fmt, ...)
{
	char buf[MAXPATHLEN * 2]; /* enough space for msg including a path */
	int fd;
	va_list ap;

	va_start(ap, fmt);
	(void) vsnprintf(buf, sizeof (buf), fmt, ap);
	va_end(ap);

	if ((fd = open(CONSOLE, O_WRONLY|O_NOCTTY)) != -1)
		(void) write(fd, buf, strlen(buf) + 1);
	(void) close(fd);
}