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/*
* 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 (c) 2001 by Sun Microsystems, Inc.
* All rights reserved.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* This file contains a routine used to validate a ifconfig-style interface
* specification
*/
#include <stdlib.h>
#include <ctype.h>
#include <alloca.h>
#include <errno.h>
#include <string.h>
#include <libinetutil.h>
/*
* Given a token with a logical unit spec, return the logical unit converted
* to a uint_t.
*
* Returns: 0 for success, nonzero if an error occurred. errno is set if
* necessary.
*/
static int
getlun(const char *bp, int bpsize, uint_t *lun)
{
char *ep = (char *)&bp[bpsize - 1];
char *sp = strchr(bp, ':'), *tp;
/* A logical unit spec looks like: <token>:<unsigned int>\0 */
if (isdigit(*bp) || !isdigit(*ep) || sp == NULL ||
strchr(sp + 1, ':') != NULL) {
errno = EINVAL;
return (-1);
}
*sp++ = '\0';
/* Lun must be all digits */
for (tp = sp; tp < ep && isdigit(*tp); tp++)
/* Null body */;
if (tp != ep) {
errno = EINVAL;
return (-1);
}
*lun = atoi(sp);
return (0);
}
/*
* Given a single token ending with a ppa spec, return the ppa spec converted
* to a uint_t.
*
* Returns: 0 for success, nonzero if an error occurred. errno is set if
* necessary.
*/
static int
getppa(const char *bp, int bpsize, uint_t *ppa)
{
char *ep = (char *)&bp[bpsize - 1];
char *tp;
if (isdigit(*bp) || !isdigit(*ep)) {
errno = EINVAL;
return (-1);
}
for (tp = ep; tp >= bp && isdigit(*tp); tp--)
/* Null body */;
if (*tp == '.' || *tp == ':') {
errno = EINVAL;
return (-1);
}
*ppa = atoi(tp + 1);
return (0);
}
/*
* Given an ifconfig-style inet relative-path interface specification
* (e.g: hme0.foo.ip.udp:2), validate its form and decompose the contents
* into a dynamically allocated ifspec_t.
*
* Returns ifspec_t for success, NULL pointer if spec is malformed.
*/
boolean_t
ifparse_ifspec(const char *ifname, ifspec_t *ifsp)
{
char *mp, *ep, *lp, *tp;
char *ifnamecp;
size_t iflen;
boolean_t have_ppa = B_FALSE;
iflen = strlen(ifname);
if (iflen > LIFNAMSIZ) {
errno = EINVAL;
return (B_FALSE);
}
/* snag a copy we can modify */
ifnamecp = alloca(iflen + 1);
(void) strlcpy(ifnamecp, ifname, iflen + 1);
ifsp->ifsp_lunvalid = B_FALSE;
/*
* An interface name must have the format of:
* dev[ppa][.module[.module...][ppa]][:lun]
*
* where only one ppa may be specified e.g. ip0.foo.tun or ip.foo.tun0
*
* lun - logical unit number.
*
* Produce substrings for each grouping, starting first with modules,
* then lun, devname, and finally ppa.
*/
/* Any modules? */
mp = strchr(ifnamecp, '.');
/* Any logical units? */
lp = strchr(ifnamecp, ':');
if (lp != NULL && mp != NULL && lp < mp) {
errno = EINVAL;
return (B_FALSE);
}
ifsp->ifsp_modcnt = 0;
if (mp != NULL) {
*mp++ = '\0';
if (lp != NULL)
*lp = '\0';
while (mp != NULL && ifsp->ifsp_modcnt <= IFSP_MAXMODS) {
if ((ep = strchr(mp, '.')) != NULL)
*ep++ = '\0';
(void) strlcpy(ifsp->ifsp_mods[ifsp->ifsp_modcnt++],
mp, LIFNAMSIZ);
mp = ep;
}
if (lp != NULL)
*lp = ':';
if (ifsp->ifsp_modcnt > IFSP_MAXMODS) {
errno = E2BIG;
return (B_FALSE);
}
}
if (lp != NULL) {
if (getlun(lp, strlen(lp), &ifsp->ifsp_lun) != 0)
return (B_FALSE);
ifsp->ifsp_lunvalid = B_TRUE;
}
(void) strlcpy(ifsp->ifsp_devnm, ifnamecp, LIFNAMSIZ);
/* Find ppa - has to be part of devname or part of last module name */
/* This should be changed to require the latter of the two */
if (getppa(ifsp->ifsp_devnm, strlen(ifsp->ifsp_devnm),
&ifsp->ifsp_ppa) == 0)
have_ppa = B_TRUE;
if (ifsp->ifsp_modcnt != 0 &&
getppa(ifsp->ifsp_mods[ifsp->ifsp_modcnt - 1],
strlen(ifsp->ifsp_mods[ifsp->ifsp_modcnt - 1]),
&ifsp->ifsp_ppa) == 0) {
if (!have_ppa)
have_ppa = B_TRUE;
else
return (B_FALSE); /* only one please */
}
if (!have_ppa)
return (B_FALSE);
/* strip the ppa off of the device name if present */
for (tp = &ifsp->ifsp_devnm[strlen(ifsp->ifsp_devnm) - 1];
tp >= ifsp->ifsp_devnm && isdigit(*tp); tp--)
*tp = '\0';
return (B_TRUE);
}
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