1 /* $NetBSD: citrus_module.c,v 1.13 2018/01/04 20:57:28 kamil Exp $ */ 2 3 /*- 4 * Copyright (c)1999, 2000, 2001, 2002 Citrus Project, 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /*- 30 * Copyright (c) 1998 The NetBSD Foundation, Inc. 31 * All rights reserved. 32 * 33 * This code is derived from software contributed to The NetBSD Foundation 34 * by Paul Kranenburg. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 46 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 47 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 48 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 49 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 50 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 51 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 52 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 53 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 54 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 55 * POSSIBILITY OF SUCH DAMAGE. 56 */ 57 58 /*- 59 * Copyright (c) 1993 60 * The Regents of the University of California. All rights reserved. 61 * 62 * This code is derived from software contributed to Berkeley by 63 * Paul Borman at Krystal Technologies. 64 * 65 * Redistribution and use in source and binary forms, with or without 66 * modification, are permitted provided that the following conditions 67 * are met: 68 * 1. Redistributions of source code must retain the above copyright 69 * notice, this list of conditions and the following disclaimer. 70 * 2. Redistributions in binary form must reproduce the above copyright 71 * notice, this list of conditions and the following disclaimer in the 72 * documentation and/or other materials provided with the distribution. 73 * 3. Neither the name of the University nor the names of its contributors 74 * may be used to endorse or promote products derived from this software 75 * without specific prior written permission. 76 * 77 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 78 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 79 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 80 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 81 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 82 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 83 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 84 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 85 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 86 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 87 * SUCH DAMAGE. 88 */ 89 90 #include <sys/cdefs.h> 91 #if defined(LIBC_SCCS) && !defined(lint) 92 __RCSID("$NetBSD: citrus_module.c,v 1.13 2018/01/04 20:57:28 kamil Exp $"); 93 #endif /* LIBC_SCCS and not lint */ 94 95 #include "namespace.h" 96 97 #include <assert.h> 98 #include <errno.h> 99 #include <limits.h> 100 #include <string.h> 101 #include <stdio.h> 102 #include <stdlib.h> 103 #include <unistd.h> 104 #include <stddef.h> 105 #include <paths.h> 106 #include "citrus_namespace.h" 107 #include "citrus_bcs.h" 108 #include "citrus_module.h" 109 110 #include <sys/types.h> 111 #include <dirent.h> 112 #include <dlfcn.h> 113 114 #ifdef _I18N_DYNAMIC 115 116 static unsigned int _getdewey(int [], char *); 117 static int _cmpndewey(int [], unsigned int, int [], unsigned int); 118 static const char *_findshlib(char *, int *, int *); 119 120 static const char *_pathI18nModule = NULL; 121 122 /* from libexec/ld.aout_so/shlib.c */ 123 #undef major 124 #undef minor 125 #define MAXDEWEY 3 /*ELF*/ 126 127 static unsigned int 128 _getdewey(int dewey[], char *cp) 129 { 130 unsigned int i, n; 131 132 _DIAGASSERT(dewey != NULL); 133 _DIAGASSERT(cp != NULL); 134 135 for (n = 0, i = 0; i < MAXDEWEY; i++) { 136 if (*cp == '\0') 137 break; 138 139 if (*cp == '.') cp++; 140 if (*cp < '0' || '9' < *cp) 141 return 0; 142 143 dewey[n++] = (int)_bcs_strtol(cp, &cp, 10); 144 } 145 146 return n; 147 } 148 149 /* 150 * Compare two dewey arrays. 151 * Return -1 if `d1' represents a smaller value than `d2'. 152 * Return 1 if `d1' represents a greater value than `d2'. 153 * Return 0 if equal. 154 */ 155 static int 156 _cmpndewey(int d1[], unsigned int n1, int d2[], unsigned int n2) 157 { 158 register unsigned int i; 159 160 _DIAGASSERT(d1 != NULL); 161 _DIAGASSERT(d2 != NULL); 162 163 for (i = 0; i < n1 && i < n2; i++) { 164 if (d1[i] < d2[i]) 165 return -1; 166 if (d1[i] > d2[i]) 167 return 1; 168 } 169 170 if (n1 == n2) 171 return 0; 172 173 if (i == n1) 174 return -1; 175 176 if (i == n2) 177 return 1; 178 179 /* XXX cannot happen */ 180 return 0; 181 } 182 183 static const char * 184 _findshlib(char *name, int *majorp, int *minorp) 185 { 186 int dewey[MAXDEWEY]; 187 unsigned int ndewey; 188 int tmp[MAXDEWEY]; 189 int i; 190 int len; 191 char *lname; 192 static char path[PATH_MAX]; 193 int major, minor; 194 const char *search_dirs[1]; 195 const int n_search_dirs = 1; 196 197 _DIAGASSERT(name != NULL); 198 _DIAGASSERT(majorp != NULL); 199 _DIAGASSERT(minorp != NULL); 200 201 major = *majorp; 202 minor = *minorp; 203 path[0] = '\0'; 204 search_dirs[0] = _pathI18nModule; 205 len = strlen(name); 206 lname = name; 207 208 ndewey = 0; 209 210 for (i = 0; i < n_search_dirs; i++) { 211 DIR *dd = opendir(search_dirs[i]); 212 struct dirent *dp; 213 int found_dot_a = 0; 214 int found_dot_so = 0; 215 216 if (dd == NULL) 217 continue; 218 219 while ((dp = readdir(dd)) != NULL) { 220 unsigned int n; 221 222 if (dp->d_namlen < len + 4) 223 continue; 224 if (strncmp(dp->d_name, lname, (size_t)len) != 0) 225 continue; 226 if (strncmp(dp->d_name+len, ".so.", 4) != 0) 227 continue; 228 229 if ((n = _getdewey(tmp, dp->d_name+len+4)) == 0) 230 continue; 231 232 if (major != -1 && found_dot_a) 233 found_dot_a = 0; 234 235 /* XXX should verify the library is a.out/ELF? */ 236 237 if (major == -1 && minor == -1) { 238 goto compare_version; 239 } else if (major != -1 && minor == -1) { 240 if (tmp[0] == major) 241 goto compare_version; 242 } else if (major != -1 && minor != -1) { 243 if (tmp[0] == major) { 244 if (n == 1 || tmp[1] >= minor) 245 goto compare_version; 246 } 247 } 248 249 /* else, this file does not qualify */ 250 continue; 251 252 compare_version: 253 if (_cmpndewey(tmp, n, dewey, ndewey) <= 0) 254 continue; 255 256 /* We have a better version */ 257 found_dot_so = 1; 258 snprintf(path, sizeof(path), "%s/%s", search_dirs[i], 259 dp->d_name); 260 found_dot_a = 0; 261 bcopy(tmp, dewey, sizeof(dewey)); 262 ndewey = n; 263 *majorp = dewey[0]; 264 *minorp = dewey[1]; 265 } 266 closedir(dd); 267 268 if (found_dot_a || found_dot_so) 269 /* 270 * There's a lib in this dir; take it. 271 */ 272 return path[0] ? path : NULL; 273 } 274 275 return path[0] ? path : NULL; 276 } 277 278 void * 279 _citrus_find_getops(_citrus_module_t handle, const char *modname, 280 const char *ifname) 281 { 282 char name[PATH_MAX]; 283 void *p; 284 285 _DIAGASSERT(handle != NULL); 286 _DIAGASSERT(modname != NULL); 287 _DIAGASSERT(ifname != NULL); 288 289 snprintf(name, sizeof(name), _C_LABEL_STRING("_citrus_%s_%s_getops"), 290 modname, ifname); 291 p = dlsym((void *)handle, name); 292 return p; 293 } 294 295 int 296 _citrus_load_module(_citrus_module_t *rhandle, const char *encname) 297 { 298 const char *p; 299 char path[PATH_MAX]; 300 int maj, min; 301 void *handle; 302 303 _DIAGASSERT(rhandle != NULL); 304 305 if (_pathI18nModule == NULL) { 306 p = getenv("PATH_I18NMODULE"); 307 if (p == NULL || issetugid()) { 308 _pathI18nModule = _PATH_I18NMODULE; 309 #ifdef MLIBDIR 310 p = strrchr(_pathI18nModule, '/'); 311 if (p != NULL) { 312 snprintf(path, sizeof(path), "%.*s/%s/%s", 313 (int)(p - _pathI18nModule), 314 _pathI18nModule, MLIBDIR, p + 1); 315 p = path; 316 } else 317 p = NULL; 318 #endif 319 } 320 if (p != NULL) { 321 _pathI18nModule = strdup(p); 322 if (_pathI18nModule == NULL) 323 return ENOMEM; 324 } 325 } 326 327 (void)snprintf(path, sizeof(path), "lib%s", encname); 328 maj = I18NMODULE_MAJOR; 329 min = -1; 330 p = _findshlib(path, &maj, &min); 331 if (!p) 332 return (EINVAL); 333 handle = dlopen(p, RTLD_LAZY); 334 if (!handle) 335 return (EINVAL); 336 337 *rhandle = (_citrus_module_t)handle; 338 339 return (0); 340 } 341 342 void 343 _citrus_unload_module(_citrus_module_t handle) 344 { 345 if (handle) 346 dlclose((void *)handle); 347 } 348 #else 349 /* !_I18N_DYNAMIC */ 350 351 void * 352 /*ARGSUSED*/ 353 _citrus_find_getops(_citrus_module_t handle, const char *modname, 354 const char *ifname) 355 { 356 return (NULL); 357 } 358 359 int 360 /*ARGSUSED*/ 361 _citrus_load_module(_citrus_module_t *rhandle, char const *modname) 362 { 363 return (EINVAL); 364 } 365 366 void 367 /*ARGSUSED*/ 368 _citrus_unload_module(_citrus_module_t handle) 369 { 370 } 371 #endif 372