usr/src/lib/libinetutil/common/ifspec.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 /*
  27  * This file contains a routine used to validate a ifconfig-style interface
  28  * specification
  29  */
  30
  31 #include <stdlib.h>
  32 #include <ctype.h>
  33 #include <alloca.h>
  34 #include <errno.h>
  35 #include <string.h>
  36 #include <libinetutil.h>
  37
  38 /*
  39  * Given a token with a logical unit spec, return the logical unit converted
  40  * to a uint_t.
  41  *
  42  * Returns: 0 for success, nonzero if an error occurred. errno is set if
  43  * necessary.
  44  */
  45 static int
  46 getlun(const char *bp, int bpsize, uint_t *lun)
  47 {
  48         char    *ep = (char *)&bp[bpsize - 1];
  49         char    *sp = strchr(bp, ':'), *tp;
  50
  51         /* A logical unit spec looks like: <token>:<unsigned int>\0 */
  52         if (isdigit(*bp) || !isdigit(*ep) || sp == NULL ||
  53             strchr(sp + 1, ':') != NULL) {
  54                 errno = EINVAL;
  55                 return (-1);
  56         }
  57
  58         *sp++ = '\0';
  59
  60         /* Lun must be all digits */
  61         for (tp = sp; tp < ep && isdigit(*tp); tp++)
  62                 /* Null body */;
  63         if (tp != ep) {
  64                 errno = EINVAL;
  65                 return (-1);
  66         }
  67
  68         *lun = atoi(sp);
  69         return (0);
  70 }
  71
  72 /*
  73  * Given a single token ending with a ppa spec, return the ppa spec converted
  74  * to a uint_t.
  75  *
  76  * Returns: 0 for success, nonzero if an error occurred. errno is set if
  77  * necessary.
  78  */
  79 static int
  80 getppa(const char *bp, int bpsize, uint_t *ppa)
  81 {
  82         char    *ep = (char *)&bp[bpsize - 1];
  83         char    *tp;
  84
  85         if (!isdigit(*ep)) {
  86                 errno = EINVAL;
  87                 return (-1);
  88         }
  89
  90         for (tp = ep; tp >= bp && isdigit(*tp); tp--)
  91                 /* Null body */;
  92
  93         if (*tp == ':') {
  94                 errno = EINVAL;
  95                 return (-1);
  96         }
  97
  98         *ppa = atoi(tp + 1);
  99         return (0);
 100 }
 101
 102 /*
 103  * Given an ifconfig-style inet relative-path interface specification
 104  * (e.g: bge0:2), validate its form and decompose the contents into a
 105  * dynamically allocated ifspec_t.
 106  *
 107  * Returns ifspec_t for success, NULL pointer if spec is malformed.
 108  */
 109 boolean_t
 110 ifparse_ifspec(const char *ifname, ifspec_t *ifsp)
 111 {
 112         char    *lp, *tp;
 113         char    ifnamecp[LIFNAMSIZ];
 114
 115         /* snag a copy we can modify */
 116         if (strlcpy(ifnamecp, ifname, LIFNAMSIZ) >= LIFNAMSIZ) {
 117                 errno = EINVAL;
 118                 return (B_FALSE);
 119         }
 120
 121         ifsp->ifsp_lunvalid = B_FALSE;
 122
 123         /*
 124          * An interface name must have the format of:
 125          * dev[ppa][:lun]
 126          *
 127          * lun - logical unit number.
 128          */
 129
 130         /* Any logical units? */
 131         lp = strchr(ifnamecp, ':');
 132         if (lp != NULL) {
 133                 if (getlun(lp, strlen(lp), &ifsp->ifsp_lun) != 0)
 134                         return (B_FALSE);
 135                 ifsp->ifsp_lunvalid = B_TRUE;
 136         }
 137
 138         (void) strlcpy(ifsp->ifsp_devnm, ifnamecp, LIFNAMSIZ);
 139
 140         /* Find ppa  */
 141         if (getppa(ifsp->ifsp_devnm, strlen(ifsp->ifsp_devnm),
 142             &ifsp->ifsp_ppa) != 0) {
 143                 return (B_FALSE);
 144         }
 145
 146         /* strip the ppa off of the device name if present */
 147         for (tp = &ifsp->ifsp_devnm[strlen(ifsp->ifsp_devnm) - 1];
 148             tp >= ifsp->ifsp_devnm && isdigit(*tp); tp--) {
 149                 *tp = '\0';
 150         }
 151
 152         return (B_TRUE);
 153 }