1 /* 2 * Copyright (c) 2000, Boris Popov 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Boris Popov. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 */ 34 35 #include <sys/types.h> 36 #include <sys/param.h> 37 #include <sys/exec.h> 38 #include <sys/queue.h> 39 #include <sys/kernel.h> 40 #include <sys/reboot.h> 41 #include <sys/linker.h> 42 #include <sys/stat.h> 43 #include <sys/module.h> 44 #define FREEBSD_ELF 45 #include <err.h> 46 #include <fts.h> 47 #include <string.h> 48 #include <machine/elf.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <unistd.h> 52 #include <errno.h> 53 54 #include "ef.h" 55 56 #define MAXRECSIZE 1024 57 #define check(val) if ((error = (val)) != 0) break 58 59 static int dflag; /* do not create a hint file, only write on stdout */ 60 static int verbose; 61 62 static FILE *fxref; /* current hints file */ 63 64 static const char *xref_file = "linker.hints"; 65 66 /* 67 * A record is stored in the static buffer recbuf before going to disk. 68 */ 69 static char recbuf[MAXRECSIZE]; 70 static int recpos; /* current write position */ 71 static int reccnt; /* total record written to this file so far */ 72 73 static void 74 intalign(void) 75 { 76 recpos = (recpos + sizeof(int) - 1) & ~(sizeof(int) - 1); 77 } 78 79 static void 80 record_start(void) 81 { 82 recpos = 0; 83 memset(recbuf, 0, MAXRECSIZE); 84 } 85 86 static int 87 record_end(void) 88 { 89 if (recpos == 0) 90 return 0; 91 reccnt++; 92 intalign(); 93 fwrite(&recpos, sizeof(recpos), 1, fxref); 94 return fwrite(recbuf, recpos, 1, fxref) != 1 ? errno : 0; 95 } 96 97 static int 98 record_buf(const void *buf, int size) 99 { 100 if (MAXRECSIZE - recpos < size) 101 errx(1, "record buffer overflow"); 102 memcpy(recbuf + recpos, buf, size); 103 recpos += size; 104 return 0; 105 } 106 107 /* 108 * An int is stored in host order and aligned 109 */ 110 static int 111 record_int(int val) 112 { 113 intalign(); 114 return record_buf(&val, sizeof(val)); 115 } 116 117 /* 118 * A string is stored as 1-byte length plus data, no padding 119 */ 120 static int 121 record_string(const char *str) 122 { 123 int len, error; 124 u_char val; 125 126 if (dflag) 127 return 0; 128 val = len = strlen(str); 129 if (len > 255) 130 errx(1, "string %s too long", str); 131 error = record_buf(&val, sizeof(val)); 132 if (error) 133 return error; 134 return record_buf(str, len); 135 } 136 137 static int 138 parse_entry(struct mod_metadata *md, const char *cval, 139 struct elf_file *ef, const char *kldname) 140 { 141 struct mod_depend mdp; 142 struct mod_version mdv; 143 Elf_Off data = (Elf_Off)md->md_data; 144 int error = 0; 145 146 record_start(); 147 switch (md->md_type) { 148 case MDT_DEPEND: 149 if (!dflag) 150 break; 151 check(EF_SEG_READ(ef, data, sizeof(mdp), &mdp)); 152 printf(" depends on %s.%d (%d,%d)\n", cval, 153 mdp.md_ver_preferred, mdp.md_ver_minimum, mdp.md_ver_maximum); 154 break; 155 case MDT_VERSION: 156 check(EF_SEG_READ(ef, data, sizeof(mdv), &mdv)); 157 if (dflag) { 158 printf(" interface %s.%d\n", cval, mdv.mv_version); 159 } else { 160 record_int(MDT_VERSION); 161 record_string(cval); 162 record_int(mdv.mv_version); 163 record_string(kldname); 164 } 165 break; 166 case MDT_MODULE: 167 if (dflag) { 168 printf(" module %s\n", cval); 169 } else { 170 record_int(MDT_MODULE); 171 record_string(cval); 172 record_string(kldname); 173 } 174 break; 175 default: 176 warnx("unknown metadata record %d in file %s", md->md_type, kldname); 177 } 178 if (!error) 179 record_end(); 180 return error; 181 } 182 183 static int 184 read_kld(char *filename, char *kldname) 185 { 186 struct mod_metadata md; 187 struct elf_file ef; 188 void **p, **orgp; 189 int error, eftype, nmlen; 190 long start, finish, entries; 191 char kldmodname[MAXMODNAME + 1], cval[MAXMODNAME + 1], *cp; 192 193 if (verbose || dflag) 194 printf("%s\n", filename); 195 error = ef_open(filename, &ef, verbose); 196 if (error) { 197 error = ef_obj_open(filename, &ef, verbose); 198 if (error) { 199 if (verbose) 200 warnc(error, "elf_open(%s)", filename); 201 return error; 202 } 203 } 204 eftype = EF_GET_TYPE(&ef); 205 if (eftype != EFT_KLD && eftype != EFT_KERNEL) { 206 EF_CLOSE(&ef); 207 return 0; 208 } 209 if (!dflag) { 210 cp = strrchr(kldname, '.'); 211 nmlen = (cp != NULL) ? cp - kldname : (int)strlen(kldname); 212 if (nmlen > MAXMODNAME) 213 nmlen = MAXMODNAME; 214 strlcpy(kldmodname, kldname, nmlen); 215 /* fprintf(fxref, "%s:%s:%d\n", kldmodname, kldname, 0);*/ 216 } 217 do { 218 check(EF_LOOKUP_SET(&ef, MDT_SETNAME, &start, &finish, 219 &entries)); 220 check(EF_SEG_READ_ENTRY_REL(&ef, start, sizeof(*p) * entries, 221 (void *)&p)); 222 orgp = p; 223 while(entries--) { 224 check(EF_SEG_READ_REL(&ef, (Elf_Off)*p, sizeof(md), 225 &md)); 226 p++; 227 check(EF_SEG_READ(&ef, (Elf_Off)md.md_cval, 228 sizeof(cval), cval)); 229 cval[MAXMODNAME] = '\0'; 230 parse_entry(&md, cval, &ef, kldname); 231 } 232 if (error) 233 warnc(error, "error while reading %s", filename); 234 free(orgp); 235 } while(0); 236 EF_CLOSE(&ef); 237 return error; 238 } 239 240 /* 241 * Create a temp file in directory root, make sure we don't 242 * overflow the buffer for the destination name 243 */ 244 static FILE * 245 maketempfile(char *dest, const char *root) 246 { 247 char *p; 248 int n, fd; 249 250 p = strrchr(root, '/'); 251 n = p != NULL ? p - root + 1 : 0; 252 if (snprintf(dest, MAXPATHLEN, "%.*slhint.XXXXXX", n, root) >= 253 MAXPATHLEN) { 254 errno = ENAMETOOLONG; 255 return NULL; 256 } 257 258 fd = mkstemp(dest); 259 if (fd < 0) 260 return NULL; 261 fchmod(fd, 0644); /* nothing secret in the file */ 262 return fdopen(fd, "w+"); 263 } 264 265 static char xrefname[MAXPATHLEN], tempname[MAXPATHLEN]; 266 267 static void 268 usage(void) 269 { 270 271 fprintf(stderr, "%s\n", 272 "usage: kldxref [-Rdv] [-f hintsfile] path ..." 273 ); 274 exit(1); 275 } 276 277 int 278 main(int argc, char *argv[]) 279 { 280 FTS *ftsp; 281 FTSENT *p; 282 int opt, fts_options, ival; 283 struct stat sb; 284 285 fts_options = FTS_PHYSICAL; 286 287 while ((opt = getopt(argc, argv, "Rdf:v")) != -1) { 288 switch (opt) { 289 case 'd': /* no hint file, only print on stdout */ 290 dflag = 1; 291 break; 292 case 'f': /* use this name instead of linker.hints */ 293 xref_file = optarg; 294 break; 295 case 'v': 296 verbose++; 297 break; 298 case 'R': /* recurse on directories */ 299 fts_options |= FTS_COMFOLLOW; 300 break; 301 default: 302 usage(); 303 /* NOTREACHED */ 304 } 305 } 306 if (argc - optind < 1) 307 usage(); 308 argc -= optind; 309 argv += optind; 310 311 if (stat(argv[0], &sb) != 0) 312 err(1, "%s", argv[0]); 313 if ((sb.st_mode & S_IFDIR) == 0) { 314 errno = ENOTDIR; 315 err(1, "%s", argv[0]); 316 } 317 318 ftsp = fts_open(argv, fts_options, 0); 319 if (ftsp == NULL) 320 exit(1); 321 322 for (;;) { 323 p = fts_read(ftsp); 324 if ((p == NULL || p->fts_info == FTS_D) && fxref) { 325 /* close and rename the current hint file */ 326 fclose(fxref); 327 fxref = NULL; 328 if (reccnt) { 329 rename(tempname, xrefname); 330 } else { 331 /* didn't find any entry, ignore this file */ 332 unlink(tempname); 333 unlink(xrefname); 334 } 335 } 336 if (p == NULL) 337 break; 338 if (p->fts_info == FTS_D && !dflag) { 339 /* visiting a new directory, create a new hint file */ 340 snprintf(xrefname, sizeof(xrefname), "%s/%s", 341 ftsp->fts_path, xref_file); 342 fxref = maketempfile(tempname, ftsp->fts_path); 343 if (fxref == NULL) 344 err(1, "can't create %s", tempname); 345 ival = 1; 346 fwrite(&ival, sizeof(ival), 1, fxref); 347 reccnt = 0; 348 } 349 /* skip non-files or .symbols entries */ 350 if (p->fts_info != FTS_F) 351 continue; 352 if (p->fts_namelen >= 8 && 353 strcmp(p->fts_name + p->fts_namelen - 8, ".symbols") == 0) 354 continue; 355 read_kld(p->fts_path, p->fts_name); 356 } 357 fts_close(ftsp); 358 return 0; 359 } 360