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
getlun(const char * bp,int bpsize,uint_t * lun)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
getppa(const char * bp,int bpsize,uint_t * ppa)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
ifparse_ifspec(const char * ifname,ifspec_t * ifsp)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 }
154