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 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * where.c - get full pathname including host: 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 33 #include <netdb.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 #include <fcntl.h> 39 #include <errno.h> 40 #include <string.h> 41 42 #include <sys/mntent.h> 43 44 #include <sys/mnttab.h> 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 48 #include <sharefs/share.h> 49 #include "sharetab.h" 50 51 extern FILE *setmntent(); 52 53 FILE *setsharetab(); 54 void endsharetab(); 55 56 57 58 extern int Debug; 59 60 /* 61 * where(pn, host, fsname, within) 62 * 63 * pn is the pathname we are looking for, 64 * host gets the name of the host owning the file system, 65 * fsname gets the file system name on the host, 66 * within gets whatever is left from the pathname 67 * 68 * Returns: 0 if ERROR, 1 if OK 69 */ 70 int 71 where(pn, host, fsname, within) 72 char *pn; 73 char *host; 74 char *fsname; 75 char *within; 76 { 77 struct stat sb; 78 char curdir[MAXPATHLEN]; 79 char qualpn[MAXPATHLEN]; 80 char *p; 81 82 if (Debug) 83 printf("where: pn %s\n", pn); 84 85 if (stat(pn, &sb) < 0) { 86 char *errstr; 87 88 if ((errstr = strerror(errno)) == NULL) 89 errstr = "unknown error"; 90 91 if (Debug) 92 printf("where: stat failed"); 93 strcpy(within, errstr); 94 return (0); 95 } 96 /* 97 * first get the working directory, 98 */ 99 if (getcwd(curdir, MAXPATHLEN) == NULL) { 100 sprintf(within, "Unable to get working directory (%s)", 101 curdir); 102 return (0); 103 } 104 if (chdir(pn) == 0) { 105 getcwd(qualpn, MAXPATHLEN); 106 chdir(curdir); 107 } else { 108 if (p = strrchr(pn, '/')) { 109 *p = 0; 110 chdir(pn); 111 (void) getcwd(qualpn, MAXPATHLEN); 112 chdir(curdir); 113 strcat(qualpn, "/"); 114 strcat(qualpn, p+1); 115 } else { 116 strcpy(qualpn, curdir); 117 strcat(qualpn, "/"); 118 strcat(qualpn, pn); 119 } 120 } 121 return (findmount(qualpn, host, fsname, within)); 122 } 123 124 /* 125 * findmount(qualpn, host, fsname, within) 126 * 127 * Searches the mount table to find the appropriate file system 128 * for a given absolute path name. 129 * host gets the name of the host owning the file system, 130 * fsname gets the file system name on the host, 131 * within gets whatever is left from the pathname 132 * 133 * Returns: 0 on failure, 1 on success. 134 */ 135 int 136 findmount(qualpn, host, fsname, within) 137 char *qualpn; 138 char *host; 139 char *fsname; 140 char *within; 141 { 142 FILE *mfp; 143 char bestname[MAXPATHLEN]; 144 int bestlen = 0, 145 bestnfs = 0; 146 struct share *exp; 147 struct mnttab mp, 148 *mnt; 149 char *endhost; /* points past the colon in name */ 150 int i, 151 len; 152 153 if (Debug) 154 printf("findmount: qualpn %s\n", qualpn); 155 156 for (i = 0; i < 10; i++) { 157 mfp = setmntent("/etc/mnttab", "r"); 158 if (mfp != NULL) 159 break; 160 sleep(1); 161 } 162 163 if (mfp == NULL) { 164 sprintf(within, "mount table problem"); 165 return (0); 166 } 167 168 bestname[0] = '\0'; 169 while ((getmntent(mfp, &mp)) == 0) { 170 if (strcmp(mp.mnt_fstype, "nfs") != 0) 171 /* 172 * If it is not nfs filesystem type, skip the 173 * entry 174 */ 175 continue; 176 177 len = preflen(qualpn, mp.mnt_mountp); 178 179 if (Debug) 180 printf("preflen: %d %s %s", len, qualpn, mp.mnt_mountp); 181 182 if (qualpn[len] != '/' && qualpn[len] != '\0' && len > 1) 183 /* 184 * If the last matching character is neither / nor 185 * the end of the pathname, not a real match 186 * (except for matching root, len==1) 187 */ 188 continue; 189 190 if (len > bestlen) { 191 bestlen = len; 192 strncpy(bestname, mp.mnt_special, sizeof (bestname)); 193 } 194 if (Debug) 195 printf(" %s\n", bestname); 196 } 197 198 endmntent(mfp); 199 200 endhost = strchr(bestname, ':'); 201 202 /* 203 * If the file system was of type NFS, then there should already 204 * be a host name, otherwise, use ours. 205 */ 206 if (endhost) { 207 *endhost++ = 0; 208 strncpy(host, bestname, MAXHOSTNAMELEN); 209 strncpy(fsname, endhost, MAXPATHLEN); 210 211 /* 212 * special case to keep the "/" when we match root 213 */ 214 if (bestlen == 1) 215 bestlen = 0; 216 } else { 217 gethostname(host, MAXHOSTNAMELEN); 218 219 /* 220 * If this is our file system, try for an even longer 221 * match from /etc/xtab. 222 */ 223 if (mfp = setsharetab()) { 224 while (getshare(mfp, &exp) > 0) 225 if (len = preflen(qualpn, exp->sh_path)) 226 if (len > bestlen) { 227 bestlen = len; 228 strncpy(bestname, exp->sh_path, 229 sizeof (bestname)); 230 } 231 endsharetab(mfp); 232 } 233 strncpy(fsname, qualpn, bestlen); 234 fsname[bestlen] = 0; 235 } 236 strncpy(within, qualpn + bestlen, MAXPATHLEN); 237 238 if (Debug) 239 printf("findmount: qualpn %s\nhost %s\nfsname %s\nwithin %s\n", 240 qualpn, host, fsname, within); 241 return (1); 242 } 243 244 /* 245 * Returns: length of second argument if it is a prefix of the 246 * first argument, otherwise zero. 247 */ 248 int 249 preflen(str, pref) 250 char *str, *pref; 251 { 252 int len; 253 254 len = strlen(pref); 255 if (strncmp(str, pref, len) == 0) 256 return (len); 257 return (0); 258 } 259 260 FILE 261 *setsharetab() 262 { 263 FILE *f; 264 265 f = fopen(SHARETAB, "r"); 266 if (f == NULL) { 267 return (NULL); 268 } 269 270 return (f); 271 } 272 273 274 void 275 endsharetab(f) 276 FILE *f; 277 { 278 (void) fclose(f); 279 } 280