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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * This file contains a routine used to validate a ifconfig-style interface 30 * specification 31 */ 32 33 #include <stdlib.h> 34 #include <ctype.h> 35 #include <alloca.h> 36 #include <errno.h> 37 #include <string.h> 38 #include <libinetutil.h> 39 40 /* 41 * Given a token with a logical unit spec, return the logical unit converted 42 * to a uint_t. 43 * 44 * Returns: 0 for success, nonzero if an error occurred. errno is set if 45 * necessary. 46 */ 47 static int 48 getlun(const char *bp, int bpsize, uint_t *lun) 49 { 50 char *ep = (char *)&bp[bpsize - 1]; 51 char *sp = strchr(bp, ':'), *tp; 52 53 /* A logical unit spec looks like: <token>:<unsigned int>\0 */ 54 if (isdigit(*bp) || !isdigit(*ep) || sp == NULL || 55 strchr(sp + 1, ':') != NULL) { 56 errno = EINVAL; 57 return (-1); 58 } 59 60 *sp++ = '\0'; 61 62 /* Lun must be all digits */ 63 for (tp = sp; tp < ep && isdigit(*tp); tp++) 64 /* Null body */; 65 if (tp != ep) { 66 errno = EINVAL; 67 return (-1); 68 } 69 70 *lun = atoi(sp); 71 return (0); 72 } 73 74 /* 75 * Given a single token ending with a ppa spec, return the ppa spec converted 76 * to a uint_t. 77 * 78 * Returns: 0 for success, nonzero if an error occurred. errno is set if 79 * necessary. 80 */ 81 static int 82 getppa(const char *bp, int bpsize, uint_t *ppa) 83 { 84 char *ep = (char *)&bp[bpsize - 1]; 85 char *tp; 86 87 if (!isdigit(*ep)) { 88 errno = EINVAL; 89 return (-1); 90 } 91 92 for (tp = ep; tp >= bp && isdigit(*tp); tp--) 93 /* Null body */; 94 95 if (*tp == '.' || *tp == ':') { 96 errno = EINVAL; 97 return (-1); 98 } 99 100 *ppa = atoi(tp + 1); 101 return (0); 102 } 103 104 /* 105 * Given an ifconfig-style inet relative-path interface specification 106 * (e.g: hme.[module].[module][PPA]:2), validate its form and decompose the 107 * contents into a dynamically allocated ifspec_t. 108 * 109 * Returns ifspec_t for success, NULL pointer if spec is malformed. 110 */ 111 boolean_t 112 ifparse_ifspec(const char *ifname, ifspec_t *ifsp) 113 { 114 char *mp, *ep, *lp, *tp; 115 char *ifnamecp; 116 size_t iflen; 117 boolean_t have_ppa = B_FALSE; 118 119 iflen = strlen(ifname); 120 if (iflen > LIFNAMSIZ) { 121 errno = EINVAL; 122 return (B_FALSE); 123 } 124 125 /* snag a copy we can modify */ 126 ifnamecp = alloca(iflen + 1); 127 (void) strlcpy(ifnamecp, ifname, iflen + 1); 128 129 ifsp->ifsp_lunvalid = B_FALSE; 130 131 /* 132 * An interface name must have the format of: 133 * dev[.module[.module...]][ppa][:lun] 134 * 135 * where the ppa must be specified at the end of the interface name. 136 * e.g. ip.foo.tun0 137 * 138 * lun - logical unit number. 139 * 140 * Produce substrings for each grouping, starting first with modules, 141 * then lun, devname, and finally ppa. 142 */ 143 144 /* Any modules? */ 145 mp = strchr(ifnamecp, '.'); 146 147 /* Any logical units? */ 148 lp = strchr(ifnamecp, ':'); 149 150 if (lp != NULL && mp != NULL && lp < mp) { 151 errno = EINVAL; 152 return (B_FALSE); 153 } 154 155 ifsp->ifsp_modcnt = 0; 156 if (mp != NULL) { 157 *mp++ = '\0'; 158 if (lp != NULL) 159 *lp = '\0'; 160 while (mp != NULL && ifsp->ifsp_modcnt <= IFSP_MAXMODS) { 161 if ((ep = strchr(mp, '.')) != NULL) 162 *ep++ = '\0'; 163 (void) strlcpy(ifsp->ifsp_mods[ifsp->ifsp_modcnt++], 164 mp, LIFNAMSIZ); 165 mp = ep; 166 } 167 if (lp != NULL) 168 *lp = ':'; 169 if (ifsp->ifsp_modcnt > IFSP_MAXMODS) { 170 errno = E2BIG; 171 return (B_FALSE); 172 } 173 } 174 175 if (lp != NULL) { 176 if (getlun(lp, strlen(lp), &ifsp->ifsp_lun) != 0) 177 return (B_FALSE); 178 ifsp->ifsp_lunvalid = B_TRUE; 179 } 180 181 (void) strlcpy(ifsp->ifsp_devnm, ifnamecp, LIFNAMSIZ); 182 183 /* 184 * Find ppa - has to be part of devname or if modules exist part of 185 * last module name. 186 */ 187 if (ifsp->ifsp_modcnt != 0 && 188 getppa(ifsp->ifsp_mods[ifsp->ifsp_modcnt - 1], 189 strlen(ifsp->ifsp_mods[ifsp->ifsp_modcnt - 1]), 190 &ifsp->ifsp_ppa) == 0) { 191 have_ppa = B_TRUE; 192 } else if (ifsp->ifsp_modcnt == 0 && 193 getppa(ifsp->ifsp_devnm, strlen(ifsp->ifsp_devnm), 194 &ifsp->ifsp_ppa) == 0) { 195 have_ppa = B_TRUE; 196 197 /* strip the ppa off of the device name if present */ 198 for (tp = &ifsp->ifsp_devnm[strlen(ifsp->ifsp_devnm) - 1]; 199 tp >= ifsp->ifsp_devnm && isdigit(*tp); tp--) 200 *tp = '\0'; 201 } 202 203 return (have_ppa); 204 } 205