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 (c) 1988 AT&T 24 * All Rights Reserved 25 * 26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * Library processing 34 */ 35 #include <stdio.h> 36 #include <unistd.h> 37 #include <fcntl.h> 38 #include <string.h> 39 #include <limits.h> 40 #include <errno.h> 41 #include <debug.h> 42 #include "msg.h" 43 #include "_libld.h" 44 45 /* 46 * List of support libraries specified (-S option). 47 */ 48 static Listnode * insert_lib; 49 50 /* 51 * Function to handle -YL and -YU substitutions in LIBPATH. It's probably 52 * very unlikely that the link-editor will ever see this, as any use of these 53 * options is normally processed by the compiler driver first and the finished 54 * -YP string is sent to us. The fact that these two options are not even 55 * documented anymore makes it even more unlikely this processing will occur. 56 */ 57 static char * 58 compat_YL_YU(Ofl_desc *ofl, char *path, int index) 59 { 60 if (index == YLDIR) { 61 if (Llibdir) { 62 /* 63 * User supplied "-YL,libdir", this is the pathname that 64 * corresponds for compatibility to -YL (as defined in 65 * sgs/include/paths.h) 66 */ 67 DBG_CALL(Dbg_libs_ylu(ofl->ofl_lml, Llibdir, 68 path, index)); 69 return (Llibdir); 70 } 71 } else if (index == YUDIR) { 72 if (Ulibdir) { 73 /* 74 * User supplied "-YU,libdir", this is the pathname that 75 * corresponds for compatibility to -YU (as defined in 76 * sgs/include/paths.h) 77 */ 78 DBG_CALL(Dbg_libs_ylu(ofl->ofl_lml, Ulibdir, 79 path, index)); 80 return (Ulibdir); 81 } 82 } 83 return (path); 84 } 85 86 static char * 87 process_lib_path(Ofl_desc *ofl, List *list, char *path, Boolean subsflag) 88 { 89 int i; 90 char *cp; 91 Boolean seenflg = FALSE; 92 char *dot = (char *)MSG_ORIG(MSG_STR_DOT); 93 94 for (i = YLDIR; i; i++) { 95 cp = strpbrk(path, MSG_ORIG(MSG_STR_PATHTOK)); 96 if (cp == NULL) { 97 if (*path == '\0') { 98 if (seenflg) 99 if (list_appendc(list, subsflag ? 100 compat_YL_YU(ofl, dot, i) : dot) == 0) 101 return ((char *)S_ERROR); 102 } else 103 if (list_appendc(list, subsflag ? 104 compat_YL_YU(ofl, path, i) : path) == 0) 105 return ((char *)S_ERROR); 106 return (cp); 107 } 108 109 if (*cp == ':') { 110 *cp = '\0'; 111 if (cp == path) { 112 if (list_appendc(list, subsflag ? 113 compat_YL_YU(ofl, dot, i) : dot) == 0) 114 return ((char *)S_ERROR); 115 } else { 116 if (list_appendc(list, subsflag ? 117 compat_YL_YU(ofl, path, i) : path) == 0) 118 return ((char *)S_ERROR); 119 } 120 path = cp + 1; 121 seenflg = TRUE; 122 continue; 123 } 124 125 /* case ";" */ 126 127 if (cp != path) { 128 if (list_appendc(list, subsflag ? 129 compat_YL_YU(ofl, path, i) : path) == 0) 130 return ((char *)S_ERROR); 131 } else { 132 if (seenflg) 133 if (list_appendc(list, subsflag ? 134 compat_YL_YU(ofl, dot, i) : dot) == 0) 135 return ((char *)S_ERROR); 136 } 137 return (cp); 138 } 139 /* NOTREACHED */ 140 return (NULL); /* keep gcc happy */ 141 } 142 143 /* 144 * adds the indicated path to those to be searched for libraries. 145 */ 146 uintptr_t 147 ld_add_libdir(Ofl_desc *ofl, const char *path) 148 { 149 if (insert_lib == NULL) { 150 if (list_prependc(&ofl->ofl_ulibdirs, path) == 0) 151 return (S_ERROR); 152 insert_lib = ofl->ofl_ulibdirs.head; 153 } else 154 if ((insert_lib = list_insertc(&ofl->ofl_ulibdirs, path, 155 insert_lib)) == 0) 156 return (S_ERROR); 157 158 /* 159 * As -l and -L options can be interspersed, print the library 160 * search paths each time a new path is added. 161 */ 162 DBG_CALL(Dbg_libs_update(ofl->ofl_lml, &ofl->ofl_ulibdirs, 163 &ofl->ofl_dlibdirs)); 164 return (1); 165 } 166 167 /* 168 * Process a required library. Combine the directory and filename, and then 169 * append either a `.so' or `.a' suffix and try opening the associated pathname. 170 */ 171 static Ifl_desc * 172 find_lib_name(const char *dir, const char *file, Ofl_desc *ofl, Rej_desc *rej) 173 { 174 int fd; 175 size_t dlen; 176 char *_path, path[PATH_MAX + 2]; 177 const char *_dir = dir; 178 Ifl_desc *ifl; 179 180 /* 181 * Determine the size of the directory. The directory and filename are 182 * concatenated into the local buffer which is purposely larger than 183 * PATH_MAX. Should a pathname be created that exceeds the system 184 * limit, the open() will catch it, and a suitable rejection message is 185 * saved. 186 */ 187 if ((dlen = strlen(dir)) == 0) { 188 _dir = (char *)MSG_ORIG(MSG_STR_DOT); 189 dlen = 1; 190 } 191 dlen++; 192 193 /* 194 * If we are in dynamic mode try and open the associated shared object. 195 */ 196 if (ofl->ofl_flags & FLG_OF_DYNLIBS) { 197 (void) snprintf(path, (PATH_MAX + 2), MSG_ORIG(MSG_STR_LIB_SO), 198 _dir, file); 199 DBG_CALL(Dbg_libs_l(ofl->ofl_lml, file, path)); 200 if ((fd = open(path, O_RDONLY)) != -1) { 201 202 if ((_path = libld_malloc(strlen(path) + 1)) == 0) 203 return ((Ifl_desc *)S_ERROR); 204 (void) strcpy(_path, path); 205 206 ifl = ld_process_open(_path, &_path[dlen], &fd, ofl, 207 FLG_IF_NEEDED, rej); 208 if (fd != -1) 209 (void) close(fd); 210 return (ifl); 211 212 } else if (errno != ENOENT) { 213 /* 214 * If the open() failed for anything other than the 215 * file not existing, record the error condition. 216 */ 217 rej->rej_type = SGS_REJ_STR; 218 rej->rej_str = strerror(errno); 219 rej->rej_name = strdup(path); 220 } 221 } 222 223 /* 224 * If we are not in dynamic mode, or a shared object could not be 225 * located, try and open the associated archive. 226 */ 227 (void) snprintf(path, (PATH_MAX + 2), MSG_ORIG(MSG_STR_LIB_A), 228 _dir, file); 229 DBG_CALL(Dbg_libs_l(ofl->ofl_lml, file, path)); 230 if ((fd = open(path, O_RDONLY)) != -1) { 231 232 if ((_path = libld_malloc(strlen(path) + 1)) == 0) 233 return ((Ifl_desc *)S_ERROR); 234 (void) strcpy(_path, path); 235 236 ifl = ld_process_open(_path, &_path[dlen], &fd, ofl, 237 FLG_IF_NEEDED, rej); 238 if (fd != -1) 239 (void) close(fd); 240 return (ifl); 241 242 } else if (errno != ENOENT) { 243 /* 244 * If the open() failed for anything other than the 245 * file not existing, record the error condition. 246 */ 247 rej->rej_type = SGS_REJ_STR; 248 rej->rej_str = strerror(errno); 249 rej->rej_name = strdup(path); 250 } 251 252 return (0); 253 } 254 255 /* 256 * Take the abbreviated name of a library file (from -lfoo) and searches for the 257 * library. The search path rules are: 258 * 259 * o use any user supplied paths, i.e. LD_LIBRARY_PATH and -L, then 260 * 261 * o use the default directories, i.e. LIBPATH or -YP. 262 * 263 * If we are in dynamic mode and -Bstatic is not in effect, first look for a 264 * shared object with full name: path/libfoo.so; then [or else] look for an 265 * archive with name: path/libfoo.a. If no file is found, it's a fatal error, 266 * otherwise process the file appropriately depending on its type. 267 */ 268 uintptr_t 269 ld_find_library(const char *name, Ofl_desc *ofl) 270 { 271 Listnode *lnp; 272 char *path; 273 Ifl_desc *ifl = 0; 274 Rej_desc rej = { 0 }; 275 276 /* 277 * Search for this file in any user defined directories. 278 */ 279 for (LIST_TRAVERSE(&ofl->ofl_ulibdirs, lnp, path)) { 280 Rej_desc _rej = { 0 }; 281 282 if ((ifl = find_lib_name(path, name, ofl, &_rej)) == 0) { 283 if (_rej.rej_type && (rej.rej_type == 0)) 284 rej = _rej; 285 continue; 286 } 287 return ((uintptr_t)ifl); 288 } 289 290 /* 291 * Finally try the default library search directories. 292 */ 293 for (LIST_TRAVERSE(&ofl->ofl_dlibdirs, lnp, path)) { 294 Rej_desc _rej = { 0 }; 295 296 if ((ifl = find_lib_name(path, name, ofl, &_rej)) == 0) { 297 if (_rej.rej_type && (rej.rej_type == 0)) 298 rej = _rej; 299 continue; 300 } 301 return ((uintptr_t)ifl); 302 } 303 304 /* 305 * If we've got this far we haven't found a shared object or archive. 306 * If an object was found, but was rejected for some reason, print a 307 * diagnostic to that effect, otherwise generate a generic "not found" 308 * diagnostic. 309 */ 310 if (rej.rej_type) 311 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(reject[rej.rej_type]), 312 rej.rej_name ? rej.rej_name : MSG_INTL(MSG_STR_UNKNOWN), 313 conv_reject_desc(&rej)); 314 else 315 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_LIB_NOTFOUND), 316 name); 317 318 ofl->ofl_flags |= FLG_OF_FATAL; 319 return (0); 320 } 321 322 /* 323 * Inspect the LD_LIBRARY_PATH variable (if the -i options has not been 324 * specified), and set up the directory list from which to search for 325 * libraries. From the man page: 326 * 327 * LD_LIBRARY_PATH=dirlist1;dirlist2 328 * and 329 * ld ... -Lpath1 ... -Lpathn ... 330 * 331 * results in a search order of: 332 * 333 * dirlist1 path1 ... pathn dirlist2 LIBPATH 334 * 335 * If LD_LIBRARY_PATH has no `;' specified, the pathname(s) supplied are 336 * all taken as dirlist2. 337 */ 338 uintptr_t 339 ld_lib_setup(Ofl_desc * ofl) 340 { 341 char *path, *cp = NULL; 342 343 /* 344 * Determine whether an LD_LIBRARY_PATH setting is in effect. 345 */ 346 if (!(ofl->ofl_flags & FLG_OF_IGNENV)) { 347 #if defined(_ELF64) 348 if ((cp = getenv(MSG_ORIG(MSG_LD_LIBPATH_64))) == NULL) 349 #else 350 if ((cp = getenv(MSG_ORIG(MSG_LD_LIBPATH_32))) == NULL) 351 #endif 352 cp = getenv(MSG_ORIG(MSG_LD_LIBPATH)); 353 } 354 355 if ((cp != NULL) && (*cp != '\0')) { 356 if ((path = libld_malloc(strlen(cp) + 1)) == 0) 357 return (S_ERROR); 358 (void) strcpy(path, cp); 359 DBG_CALL(Dbg_libs_path(ofl->ofl_lml, path, LA_SER_DEFAULT, 0)); 360 361 /* 362 * Process the first path string (anything up to a null or 363 * a `;'); 364 */ 365 path = process_lib_path(ofl, &ofl->ofl_ulibdirs, path, FALSE); 366 367 368 /* 369 * If a `;' was seen then initialize the insert flag to the 370 * tail of this list. This is where any -L paths will be 371 * added (otherwise -L paths are prepended to this list). 372 * Continue to process the remaining path string. 373 */ 374 if (path) { 375 insert_lib = ofl->ofl_ulibdirs.tail; 376 *path = '\0'; 377 ++path; 378 cp = process_lib_path(ofl, &ofl->ofl_ulibdirs, path, 379 FALSE); 380 if (cp == (char *)S_ERROR) 381 return (S_ERROR); 382 else if (cp) 383 eprintf(ofl->ofl_lml, ERR_WARNING, 384 MSG_INTL(MSG_LIB_MALFORM)); 385 } 386 } 387 388 /* 389 * Add the default LIBPATH or any -YP supplied path. 390 */ 391 DBG_CALL(Dbg_libs_yp(ofl->ofl_lml, Plibpath)); 392 cp = process_lib_path(ofl, &ofl->ofl_dlibdirs, Plibpath, TRUE); 393 if (cp == (char *)S_ERROR) 394 return (S_ERROR); 395 else if (cp) { 396 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_LIB_BADYP)); 397 return (S_ERROR); 398 } 399 DBG_CALL(Dbg_libs_init(ofl->ofl_lml, &ofl->ofl_ulibdirs, 400 &ofl->ofl_dlibdirs)); 401 return (1); 402 } 403