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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 2001 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * This file contains a routine used to validate a ifconfig-style interface 31 * specification 32 */ 33 34 #include <stdlib.h> 35 #include <ctype.h> 36 #include <alloca.h> 37 #include <errno.h> 38 #include <string.h> 39 #include <libinetutil.h> 40 41 /* 42 * Given a token with a logical unit spec, return the logical unit converted 43 * to a uint_t. 44 * 45 * Returns: 0 for success, nonzero if an error occurred. errno is set if 46 * necessary. 47 */ 48 static int 49 getlun(const char *bp, int bpsize, uint_t *lun) 50 { 51 char *ep = (char *)&bp[bpsize - 1]; 52 char *sp = strchr(bp, ':'), *tp; 53 54 /* A logical unit spec looks like: <token>:<unsigned int>\0 */ 55 if (isdigit(*bp) || !isdigit(*ep) || sp == NULL || 56 strchr(sp + 1, ':') != NULL) { 57 errno = EINVAL; 58 return (-1); 59 } 60 61 *sp++ = '\0'; 62 63 /* Lun must be all digits */ 64 for (tp = sp; tp < ep && isdigit(*tp); tp++) 65 /* Null body */; 66 if (tp != ep) { 67 errno = EINVAL; 68 return (-1); 69 } 70 71 *lun = atoi(sp); 72 return (0); 73 } 74 75 /* 76 * Given a single token ending with a ppa spec, return the ppa spec converted 77 * to a uint_t. 78 * 79 * Returns: 0 for success, nonzero if an error occurred. errno is set if 80 * necessary. 81 */ 82 static int 83 getppa(const char *bp, int bpsize, uint_t *ppa) 84 { 85 char *ep = (char *)&bp[bpsize - 1]; 86 char *tp; 87 88 if (isdigit(*bp) || !isdigit(*ep)) { 89 errno = EINVAL; 90 return (-1); 91 } 92 93 for (tp = ep; tp >= bp && isdigit(*tp); tp--) 94 /* Null body */; 95 96 if (*tp == '.' || *tp == ':') { 97 errno = EINVAL; 98 return (-1); 99 } 100 101 *ppa = atoi(tp + 1); 102 return (0); 103 } 104 105 /* 106 * Given an ifconfig-style inet relative-path interface specification 107 * (e.g: hme0.foo.ip.udp:2), validate its form and decompose the contents 108 * into a dynamically allocated ifspec_t. 109 * 110 * Returns ifspec_t for success, NULL pointer if spec is malformed. 111 */ 112 boolean_t 113 ifparse_ifspec(const char *ifname, ifspec_t *ifsp) 114 { 115 char *mp, *ep, *lp, *tp; 116 char *ifnamecp; 117 size_t iflen; 118 boolean_t have_ppa = B_FALSE; 119 120 iflen = strlen(ifname); 121 if (iflen > LIFNAMSIZ) { 122 errno = EINVAL; 123 return (B_FALSE); 124 } 125 126 /* snag a copy we can modify */ 127 ifnamecp = alloca(iflen + 1); 128 (void) strlcpy(ifnamecp, ifname, iflen + 1); 129 130 ifsp->ifsp_lunvalid = B_FALSE; 131 132 /* 133 * An interface name must have the format of: 134 * dev[ppa][.module[.module...][ppa]][:lun] 135 * 136 * where only one ppa may be specified e.g. ip0.foo.tun or 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 /* Find ppa - has to be part of devname or part of last module name */ 184 /* This should be changed to require the latter of the two */ 185 if (getppa(ifsp->ifsp_devnm, strlen(ifsp->ifsp_devnm), 186 &ifsp->ifsp_ppa) == 0) 187 have_ppa = B_TRUE; 188 if (ifsp->ifsp_modcnt != 0 && 189 getppa(ifsp->ifsp_mods[ifsp->ifsp_modcnt - 1], 190 strlen(ifsp->ifsp_mods[ifsp->ifsp_modcnt - 1]), 191 &ifsp->ifsp_ppa) == 0) { 192 if (!have_ppa) 193 have_ppa = B_TRUE; 194 else 195 return (B_FALSE); /* only one please */ 196 } 197 if (!have_ppa) 198 return (B_FALSE); 199 200 /* strip the ppa off of the device name if present */ 201 for (tp = &ifsp->ifsp_devnm[strlen(ifsp->ifsp_devnm) - 1]; 202 tp >= ifsp->ifsp_devnm && isdigit(*tp); tp--) 203 *tp = '\0'; 204 205 return (B_TRUE); 206 } 207