usr.sbin/kldxref/kldxref.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-4-Clause
   3  *
   4  * Copyright (c) 2000, Boris Popov
   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  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *    This product includes software developed by Boris Popov.
  18  * 4. Neither the name of the author nor the names of any co-contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $FreeBSD$
  35  */
  36
  37 #include <sys/types.h>
  38 #include <sys/param.h>
  39 #include <sys/endian.h>
  40 #include <sys/exec.h>
  41 #include <sys/queue.h>
  42 #include <sys/kernel.h>
  43 #include <sys/reboot.h>
  44 #include <sys/linker.h>
  45 #include <sys/stat.h>
  46 #include <sys/module.h>
  47 #define FREEBSD_ELF
  48
  49 #include <ctype.h>
  50 #include <err.h>
  51 #include <errno.h>
  52 #include <fts.h>
  53 #include <stdbool.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58 #include <machine/elf.h>
  59
  60 #include "ef.h"
  61
  62 #define MAXRECSIZE      (64 << 10)      /* 64k */
  63 #define check(val)      if ((error = (val)) != 0) break
  64
  65 static bool dflag;      /* do not create a hint file, only write on stdout */
  66 static int verbose;
  67
  68 static FILE *fxref;     /* current hints file */
  69
  70 static const char *xref_file = "linker.hints";
  71
  72 /*
  73  * A record is stored in the static buffer recbuf before going to disk.
  74  */
  75 static char recbuf[MAXRECSIZE];
  76 static int recpos;      /* current write position */
  77 static int reccnt;      /* total record written to this file so far */
  78
  79 static void
  80 intalign(void)
  81 {
  82
  83         recpos = roundup2(recpos, sizeof(int));
  84 }
  85
  86 static void
  87 record_start(void)
  88 {
  89
  90         recpos = 0;
  91         memset(recbuf, 0, MAXRECSIZE);
  92 }
  93
  94 static int
  95 record_end(void)
  96 {
  97
  98         if (recpos == 0)
  99                 return (0);
 100         reccnt++;
 101         intalign();
 102         fwrite(&recpos, sizeof(recpos), 1, fxref);
 103         return (fwrite(recbuf, recpos, 1, fxref) != 1 ? errno : 0);
 104 }
 105
 106 static int
 107 record_buf(const void *buf, size_t size)
 108 {
 109
 110         if (MAXRECSIZE - recpos < size)
 111                 errx(1, "record buffer overflow");
 112         memcpy(recbuf + recpos, buf, size);
 113         recpos += size;
 114         return (0);
 115 }
 116
 117 /*
 118  * An int is stored in host order and aligned
 119  */
 120 static int
 121 record_int(int val)
 122 {
 123
 124         intalign();
 125         return (record_buf(&val, sizeof(val)));
 126 }
 127
 128 /*
 129  * A string is stored as 1-byte length plus data, no padding
 130  */
 131 static int
 132 record_string(const char *str)
 133 {
 134         int error;
 135         size_t len;
 136         u_char val;
 137
 138         if (dflag)
 139                 return (0);
 140         val = len = strlen(str);
 141         if (len > 255)
 142                 errx(1, "string %s too long", str);
 143         error = record_buf(&val, sizeof(val));
 144         if (error != 0)
 145                 return (error);
 146         return (record_buf(str, len));
 147 }
 148
 149 /* From sys/isa/pnp.c */
 150 static char *
 151 pnp_eisaformat(uint32_t id)
 152 {
 153         uint8_t *data;
 154         static char idbuf[8];
 155         const char  hextoascii[] = "0123456789abcdef";
 156
 157         id = htole32(id);
 158         data = (uint8_t *)&id;
 159         idbuf[0] = '@' + ((data[0] & 0x7c) >> 2);
 160         idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5));
 161         idbuf[2] = '@' + (data[1] & 0x1f);
 162         idbuf[3] = hextoascii[(data[2] >> 4)];
 163         idbuf[4] = hextoascii[(data[2] & 0xf)];
 164         idbuf[5] = hextoascii[(data[3] >> 4)];
 165         idbuf[6] = hextoascii[(data[3] & 0xf)];
 166         idbuf[7] = 0;
 167         return (idbuf);
 168 }
 169
 170 struct pnp_elt
 171 {
 172         int     pe_kind;        /* What kind of entry */
 173 #define TYPE_SZ_MASK    0x0f
 174 #define TYPE_FLAGGED    0x10    /* all f's is a wildcard */
 175 #define TYPE_INT        0x20    /* Is a number */
 176 #define TYPE_PAIRED     0x40
 177 #define TYPE_LE         0x80    /* Matches <= this value */
 178 #define TYPE_GE         0x100   /* Matches >= this value */
 179 #define TYPE_MASK       0x200   /* Specifies a mask to follow */
 180 #define TYPE_U8         (1 | TYPE_INT)
 181 #define TYPE_V8         (1 | TYPE_INT | TYPE_FLAGGED)
 182 #define TYPE_G16        (2 | TYPE_INT | TYPE_GE)
 183 #define TYPE_L16        (2 | TYPE_INT | TYPE_LE)
 184 #define TYPE_M16        (2 | TYPE_INT | TYPE_MASK)
 185 #define TYPE_U16        (2 | TYPE_INT)
 186 #define TYPE_V16        (2 | TYPE_INT | TYPE_FLAGGED)
 187 #define TYPE_U32        (4 | TYPE_INT)
 188 #define TYPE_V32        (4 | TYPE_INT | TYPE_FLAGGED)
 189 #define TYPE_W32        (4 | TYPE_INT | TYPE_PAIRED)
 190 #define TYPE_D          7
 191 #define TYPE_Z          8
 192 #define TYPE_P          9
 193 #define TYPE_E          10
 194 #define TYPE_T          11
 195         int     pe_offset;      /* Offset within the element */
 196         char *  pe_key;         /* pnp key name */
 197         TAILQ_ENTRY(pnp_elt) next; /* Link */
 198 };
 199 typedef TAILQ_HEAD(pnp_head, pnp_elt) pnp_list;
 200
 201 /*
 202  * this function finds the data from the pnp table, as described by the
 203  * the description and creates a new output (new_desc). This output table
 204  * is a form that's easier for the agent that's automatically loading the
 205  * modules.
 206  *
 207  * The format output is the simplified string from this routine in the
 208  * same basic format as the pnp string, as documented in sys/module.h.
 209  * First a string describing the format is output, the a count of the
 210  * number of records, then each record. The format string also describes
 211  * the length of each entry (though it isn't a fixed length when strings
 212  * are present).
 213  *
 214  *      type    Output          Meaning
 215  *      I       uint32_t        Integer equality comparison
 216  *      J       uint32_t        Pair of uint16_t fields converted to native
 217  *                              byte order. The two fields both must match.
 218  *      G       uint32_t        Greater than or equal to
 219  *      L       uint32_t        Less than or equal to
 220  *      M       uint32_t        Mask of which fields to test. Fields that
 221  *                              take up space increment the count. This
 222  *                              field must be first, and resets the count.
 223  *      D       string          Description of the device this pnp info is for
 224  *      Z       string          pnp string must match this
 225  *      T       nothing         T fields set pnp values that must be true for
 226  *                              the entire table.
 227  * Values are packed the same way that other values are packed in this file.
 228  * Strings and int32_t's start on a 32-bit boundary and are padded with 0
 229  * bytes. Objects that are smaller than uint32_t are converted, without
 230  * sign extension to uint32_t to simplify parsing downstream.
 231  */
 232 static int
 233 parse_pnp_list(const char *desc, char **new_desc, pnp_list *list)
 234 {
 235         const char *walker, *ep;
 236         const char *colon, *semi;
 237         struct pnp_elt *elt;
 238         char *nd;
 239         char type[8], key[32];
 240         int off;
 241
 242         walker = desc;
 243         ep = desc + strlen(desc);
 244         off = 0;
 245         nd = *new_desc = malloc(strlen(desc) + 1);
 246         if (verbose > 1)
 247                 printf("Converting %s into a list\n", desc);
 248         while (walker < ep) {
 249                 colon = strchr(walker, ':');
 250                 semi = strchr(walker, ';');
 251                 if (semi != NULL && semi < colon)
 252                         goto err;
 253                 if (colon - walker > sizeof(type))
 254                         goto err;
 255                 strncpy(type, walker, colon - walker);
 256                 type[colon - walker] = '\0';
 257                 if (semi != NULL) {
 258                         if (semi - colon >= sizeof(key))
 259                                 goto err;
 260                         strncpy(key, colon + 1, semi - colon - 1);
 261                         key[semi - colon - 1] = '\0';
 262                         walker = semi + 1;
 263                         /* Fail safe if we have spaces after ; */
 264                         while (walker < ep && isspace(*walker))
 265                                 walker++;
 266                 } else {
 267                         if (strlen(colon + 1) >= sizeof(key))
 268                                 goto err;
 269                         strcpy(key, colon + 1);
 270                         walker = ep;
 271                 }
 272                 if (verbose > 1)
 273                         printf("Found type %s for name %s\n", type, key);
 274                 /* Skip pointer place holders */
 275                 if (strcmp(type, "P") == 0) {
 276                         off += sizeof(void *);
 277                         continue;
 278                 }
 279
 280                 /*
 281                  * Add a node of the appropriate type
 282                  */
 283                 elt = malloc(sizeof(struct pnp_elt) + strlen(key) + 1);
 284                 TAILQ_INSERT_TAIL(list, elt, next);
 285                 elt->pe_key = (char *)(elt + 1);
 286                 elt->pe_offset = off;
 287                 if (strcmp(type, "U8") == 0)
 288                         elt->pe_kind = TYPE_U8;
 289                 else if (strcmp(type, "V8") == 0)
 290                         elt->pe_kind = TYPE_V8;
 291                 else if (strcmp(type, "G16") == 0)
 292                         elt->pe_kind = TYPE_G16;
 293                 else if (strcmp(type, "L16") == 0)
 294                         elt->pe_kind = TYPE_L16;
 295                 else if (strcmp(type, "M16") == 0)
 296                         elt->pe_kind = TYPE_M16;
 297                 else if (strcmp(type, "U16") == 0)
 298                         elt->pe_kind = TYPE_U16;
 299                 else if (strcmp(type, "V16") == 0)
 300                         elt->pe_kind = TYPE_V16;
 301                 else if (strcmp(type, "U32") == 0)
 302                         elt->pe_kind = TYPE_U32;
 303                 else if (strcmp(type, "V32") == 0)
 304                         elt->pe_kind = TYPE_V32;
 305                 else if (strcmp(type, "W32") == 0)
 306                         elt->pe_kind = TYPE_W32;
 307                 else if (strcmp(type, "D") == 0)        /* description char * */
 308                         elt->pe_kind = TYPE_D;
 309                 else if (strcmp(type, "Z") == 0)        /* char * to match */
 310                         elt->pe_kind = TYPE_Z;
 311                 else if (strcmp(type, "P") == 0)        /* Pointer -- ignored */
 312                         elt->pe_kind = TYPE_P;
 313                 else if (strcmp(type, "E") == 0)        /* EISA PNP ID, as uint32_t */
 314                         elt->pe_kind = TYPE_E;
 315                 else if (strcmp(type, "T") == 0)
 316                         elt->pe_kind = TYPE_T;
 317                 else
 318                         goto err;
 319                 /*
 320                  * Maybe the rounding here needs to be more nuanced and/or somehow
 321                  * architecture specific. Fortunately, most tables in the system
 322                  * have sane ordering of types.
 323                  */
 324                 if (elt->pe_kind & TYPE_INT) {
 325                         elt->pe_offset = roundup2(elt->pe_offset, elt->pe_kind & TYPE_SZ_MASK);
 326                         off = elt->pe_offset + (elt->pe_kind & TYPE_SZ_MASK);
 327                 } else if (elt->pe_kind == TYPE_E) {
 328                         /* Type E stored as Int, displays as string */
 329                         elt->pe_offset = roundup2(elt->pe_offset, sizeof(uint32_t));
 330                         off = elt->pe_offset + sizeof(uint32_t);
 331                 } else if (elt->pe_kind == TYPE_T) {
 332                         /* doesn't actually consume space in the table */
 333                         off = elt->pe_offset;
 334                 } else {
 335                         elt->pe_offset = roundup2(elt->pe_offset, sizeof(void *));
 336                         off = elt->pe_offset + sizeof(void *);
 337                 }
 338                 if (elt->pe_kind & TYPE_PAIRED) {
 339                         char *word, *ctx;
 340
 341                         for (word = strtok_r(key, "/", &ctx);
 342                              word; word = strtok_r(NULL, "/", &ctx)) {
 343                                 sprintf(nd, "%c:%s;", elt->pe_kind & TYPE_FLAGGED ? 'J' : 'I',
 344                                     word);
 345                                 nd += strlen(nd);
 346                         }
 347
 348                 }
 349                 else {
 350                         if (elt->pe_kind & TYPE_FLAGGED)
 351                                 *nd++ = 'J';
 352                         else if (elt->pe_kind & TYPE_GE)
 353                                 *nd++ = 'G';
 354                         else if (elt->pe_kind & TYPE_LE)
 355                                 *nd++ = 'L';
 356                         else if (elt->pe_kind & TYPE_MASK)
 357                                 *nd++ = 'M';
 358                         else if (elt->pe_kind & TYPE_INT)
 359                                 *nd++ = 'I';
 360                         else if (elt->pe_kind == TYPE_D)
 361                                 *nd++ = 'D';
 362                         else if (elt->pe_kind == TYPE_Z || elt->pe_kind == TYPE_E)
 363                                 *nd++ = 'Z';
 364                         else if (elt->pe_kind == TYPE_T)
 365                                 *nd++ = 'T';
 366                         else
 367                                 errx(1, "Impossible type %x\n", elt->pe_kind);
 368                         *nd++ = ':';
 369                         strcpy(nd, key);
 370                         nd += strlen(nd);
 371                         *nd++ = ';';
 372                 }
 373         }
 374         *nd++ = '\0';
 375         return (0);
 376 err:
 377         errx(1, "Parse error of description string %s", desc);
 378 }
 379
 380 static int
 381 parse_entry(struct mod_metadata *md, const char *cval,
 382     struct elf_file *ef, const char *kldname)
 383 {
 384         struct mod_depend mdp;
 385         struct mod_version mdv;
 386         struct mod_pnp_match_info pnp;
 387         char descr[1024];
 388         Elf_Off data;
 389         int error, i;
 390         size_t len;
 391         char *walker;
 392         void *table;
 393
 394         data = (Elf_Off)md->md_data;
 395         error = 0;
 396         record_start();
 397         switch (md->md_type) {
 398         case MDT_DEPEND:
 399                 if (!dflag)
 400                         break;
 401                 check(EF_SEG_READ(ef, data, sizeof(mdp), &mdp));
 402                 printf("  depends on %s.%d (%d,%d)\n", cval,
 403                     mdp.md_ver_preferred, mdp.md_ver_minimum, mdp.md_ver_maximum);
 404                 break;
 405         case MDT_VERSION:
 406                 check(EF_SEG_READ(ef, data, sizeof(mdv), &mdv));
 407                 if (dflag) {
 408                         printf("  interface %s.%d\n", cval, mdv.mv_version);
 409                 } else {
 410                         record_int(MDT_VERSION);
 411                         record_string(cval);
 412                         record_int(mdv.mv_version);
 413                         record_string(kldname);
 414                 }
 415                 break;
 416         case MDT_MODULE:
 417                 if (dflag) {
 418                         printf("  module %s\n", cval);
 419                 } else {
 420                         record_int(MDT_MODULE);
 421                         record_string(cval);
 422                         record_string(kldname);
 423                 }
 424                 break;
 425         case MDT_PNP_INFO:
 426                 check(EF_SEG_READ_REL(ef, data, sizeof(pnp), &pnp));
 427                 check(EF_SEG_READ_STRING(ef, (Elf_Off)pnp.descr, sizeof(descr), descr));
 428                 descr[sizeof(descr) - 1] = '\0';
 429                 if (dflag) {
 430                         printf("  pnp info for bus %s format %s %d entries of %d bytes\n",
 431                             cval, descr, pnp.num_entry, pnp.entry_len);
 432                 } else {
 433                         pnp_list list;
 434                         struct pnp_elt *elt, *elt_tmp;
 435                         char *new_descr;
 436
 437                         if (verbose > 1)
 438                                 printf("  pnp info for bus %s format %s %d entries of %d bytes\n",
 439                                     cval, descr, pnp.num_entry, pnp.entry_len);
 440                         /*
 441                          * Parse descr to weed out the chaff and to create a list
 442                          * of offsets to output.
 443                          */
 444                         TAILQ_INIT(&list);
 445                         parse_pnp_list(descr, &new_descr, &list);
 446                         record_int(MDT_PNP_INFO);
 447                         record_string(cval);
 448                         record_string(new_descr);
 449                         record_int(pnp.num_entry);
 450                         len = pnp.num_entry * pnp.entry_len;
 451                         walker = table = malloc(len);
 452                         check(EF_SEG_READ_REL(ef, (Elf_Off)pnp.table, len, table));
 453
 454                         /*
 455                          * Walk the list and output things. We've collapsed all the
 456                          * variant forms of the table down to just ints and strings.
 457                          */
 458                         for (i = 0; i < pnp.num_entry; i++) {
 459                                 TAILQ_FOREACH(elt, &list, next) {
 460                                         uint8_t v1;
 461                                         uint16_t v2;
 462                                         uint32_t v4;
 463                                         int     value;
 464                                         char buffer[1024];
 465
 466                                         if (elt->pe_kind == TYPE_W32) {
 467                                                 memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
 468                                                 value = v4 & 0xffff;
 469                                                 record_int(value);
 470                                                 if (verbose > 1)
 471                                                         printf("W32:%#x", value);
 472                                                 value = (v4 >> 16) & 0xffff;
 473                                                 record_int(value);
 474                                                 if (verbose > 1)
 475                                                         printf(":%#x;", value);
 476                                         } else if (elt->pe_kind & TYPE_INT) {
 477                                                 switch (elt->pe_kind & TYPE_SZ_MASK) {
 478                                                 case 1:
 479                                                         memcpy(&v1, walker + elt->pe_offset, sizeof(v1));
 480                                                         if ((elt->pe_kind & TYPE_FLAGGED) && v1 == 0xff)
 481                                                                 value = -1;
 482                                                         else
 483                                                                 value = v1;
 484                                                         break;
 485                                                 case 2:
 486                                                         memcpy(&v2, walker + elt->pe_offset, sizeof(v2));
 487                                                         if ((elt->pe_kind & TYPE_FLAGGED) && v2 == 0xffff)
 488                                                                 value = -1;
 489                                                         else
 490                                                                 value = v2;
 491                                                         break;
 492                                                 case 4:
 493                                                         memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
 494                                                         if ((elt->pe_kind & TYPE_FLAGGED) && v4 == 0xffffffff)
 495                                                                 value = -1;
 496                                                         else
 497                                                                 value = v4;
 498                                                         break;
 499                                                 default:
 500                                                         errx(1, "Invalid size somehow %#x", elt->pe_kind);
 501                                                 }
 502                                                 if (verbose > 1)
 503                                                         printf("I:%#x;", value);
 504                                                 record_int(value);
 505                                         } else if (elt->pe_kind == TYPE_T) {
 506                                                 /* Do nothing */
 507                                         } else { /* E, Z or D -- P already filtered */
 508                                                 if (elt->pe_kind == TYPE_E) {
 509                                                         memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
 510                                                         strcpy(buffer, pnp_eisaformat(v4));
 511                                                 } else {
 512                                                         char *ptr;
 513
 514                                                         ptr = *(char **)(walker + elt->pe_offset);
 515                                                         buffer[0] = '\0';
 516                                                         if (ptr != NULL) {
 517                                                                 EF_SEG_READ_STRING(ef, (Elf_Off)ptr,
 518                                                                     sizeof(buffer), buffer);
 519                                                                 buffer[sizeof(buffer) - 1] = '\0';
 520                                                         }
 521                                                 }
 522                                                 if (verbose > 1)
 523                                                         printf("%c:%s;", elt->pe_kind == TYPE_E ? 'E' : (elt->pe_kind == TYPE_Z ? 'Z' : 'D'), buffer);
 524                                                 record_string(buffer);
 525                                         }
 526                                 }
 527                                 if (verbose > 1)
 528                                         printf("\n");
 529                                 walker += pnp.entry_len;
 530                         }
 531                         /* Now free it */
 532                         TAILQ_FOREACH_SAFE(elt, &list, next, elt_tmp) {
 533                                 TAILQ_REMOVE(&list, elt, next);
 534                                 free(elt);
 535                         }
 536                         free(table);
 537                 }
 538                 break;
 539         default:
 540                 warnx("unknown metadata record %d in file %s", md->md_type, kldname);
 541         }
 542         if (!error)
 543                 record_end();
 544         return (error);
 545 }
 546
 547 static int
 548 read_kld(char *filename, char *kldname)
 549 {
 550         struct mod_metadata md;
 551         struct elf_file ef;
 552         void **p, **orgp;
 553         int error, eftype;
 554         long start, finish, entries;
 555         char cval[MAXMODNAME + 1];
 556
 557         if (verbose || dflag)
 558                 printf("%s\n", filename);
 559         error = ef_open(filename, &ef, verbose);
 560         if (error != 0) {
 561                 error = ef_obj_open(filename, &ef, verbose);
 562                 if (error != 0) {
 563                         if (verbose)
 564                                 warnc(error, "elf_open(%s)", filename);
 565                         return (error);
 566                 }
 567         }
 568         eftype = EF_GET_TYPE(&ef);
 569         if (eftype != EFT_KLD && eftype != EFT_KERNEL)  {
 570                 EF_CLOSE(&ef);
 571                 return (0);
 572         }
 573         do {
 574                 check(EF_LOOKUP_SET(&ef, MDT_SETNAME, &start, &finish,
 575                     &entries));
 576                 check(EF_SEG_READ_ENTRY_REL(&ef, start, sizeof(*p) * entries,
 577                     (void *)&p));
 578                 orgp = p;
 579                 while(entries--) {
 580                         check(EF_SEG_READ_REL(&ef, (Elf_Off)*p, sizeof(md),
 581                             &md));
 582                         p++;
 583                         check(EF_SEG_READ_STRING(&ef, (Elf_Off)md.md_cval,
 584                             sizeof(cval), cval));
 585                         parse_entry(&md, cval, &ef, kldname);
 586                 }
 587                 if (error != 0)
 588                         warnc(error, "error while reading %s", filename);
 589                 free(orgp);
 590         } while(0);
 591         EF_CLOSE(&ef);
 592         return (error);
 593 }
 594
 595 /*
 596  * Create a temp file in directory root, make sure we don't
 597  * overflow the buffer for the destination name
 598  */
 599 static FILE *
 600 maketempfile(char *dest, const char *root)
 601 {
 602         char *p;
 603         int n, fd;
 604
 605         p = strrchr(root, '/');
 606         n = p != NULL ? p - root + 1 : 0;
 607         if (snprintf(dest, MAXPATHLEN, "%.*slhint.XXXXXX", n, root) >=
 608             MAXPATHLEN) {
 609                 errno = ENAMETOOLONG;
 610                 return (NULL);
 611         }
 612
 613         fd = mkstemp(dest);
 614         if (fd < 0)
 615                 return (NULL);
 616         fchmod(fd, 0644);       /* nothing secret in the file */
 617         return (fdopen(fd, "w+"));
 618 }
 619
 620 static char xrefname[MAXPATHLEN], tempname[MAXPATHLEN];
 621
 622 static void
 623 usage(void)
 624 {
 625
 626         fprintf(stderr, "%s\n",
 627             "usage: kldxref [-Rdv] [-f hintsfile] path ..."
 628         );
 629         exit(1);
 630 }
 631
 632 static int
 633 compare(const FTSENT *const *a, const FTSENT *const *b)
 634 {
 635
 636         if ((*a)->fts_info == FTS_D && (*b)->fts_info != FTS_D)
 637                 return (1);
 638         if ((*a)->fts_info != FTS_D && (*b)->fts_info == FTS_D)
 639                 return (-1);
 640         return (strcmp((*a)->fts_name, (*b)->fts_name));
 641 }
 642
 643 int
 644 main(int argc, char *argv[])
 645 {
 646         FTS *ftsp;
 647         FTSENT *p;
 648         int opt, fts_options, ival;
 649         struct stat sb;
 650
 651         fts_options = FTS_PHYSICAL;
 652
 653         while ((opt = getopt(argc, argv, "Rdf:v")) != -1) {
 654                 switch (opt) {
 655                 case 'd':       /* no hint file, only print on stdout */
 656                         dflag = true;
 657                         break;
 658                 case 'f':       /* use this name instead of linker.hints */
 659                         xref_file = optarg;
 660                         break;
 661                 case 'v':
 662                         verbose++;
 663                         break;
 664                 case 'R':       /* recurse on directories */
 665                         fts_options |= FTS_COMFOLLOW;
 666                         break;
 667                 default:
 668                         usage();
 669                         /* NOTREACHED */
 670                 }
 671         }
 672         if (argc - optind < 1)
 673                 usage();
 674         argc -= optind;
 675         argv += optind;
 676
 677         if (stat(argv[0], &sb) != 0)
 678                 err(1, "%s", argv[0]);
 679         if ((sb.st_mode & S_IFDIR) == 0) {
 680                 errno = ENOTDIR;
 681                 err(1, "%s", argv[0]);
 682         }
 683
 684         ftsp = fts_open(argv, fts_options, compare);
 685         if (ftsp == NULL)
 686                 exit(1);
 687
 688         for (;;) {
 689                 p = fts_read(ftsp);
 690                 if ((p == NULL || p->fts_info == FTS_D) && fxref) {
 691                         /* close and rename the current hint file */
 692                         fclose(fxref);
 693                         fxref = NULL;
 694                         if (reccnt != 0) {
 695                                 rename(tempname, xrefname);
 696                         } else {
 697                                 /* didn't find any entry, ignore this file */
 698                                 unlink(tempname);
 699                                 unlink(xrefname);
 700                         }
 701                 }
 702                 if (p == NULL)
 703                         break;
 704                 if (p->fts_info == FTS_D && !dflag) {
 705                         /* visiting a new directory, create a new hint file */
 706                         snprintf(xrefname, sizeof(xrefname), "%s/%s",
 707                             ftsp->fts_path, xref_file);
 708                         fxref = maketempfile(tempname, ftsp->fts_path);
 709                         if (fxref == NULL)
 710                                 err(1, "can't create %s", tempname);
 711                         ival = 1;
 712                         fwrite(&ival, sizeof(ival), 1, fxref);
 713                         reccnt = 0;
 714                 }
 715                 /* skip non-files and separate debug files */
 716                 if (p->fts_info != FTS_F)
 717                         continue;
 718                 if (p->fts_namelen >= 6 &&
 719                     strcmp(p->fts_name + p->fts_namelen - 6, ".debug") == 0)
 720                         continue;
 721                 if (p->fts_namelen >= 8 &&
 722                     strcmp(p->fts_name + p->fts_namelen - 8, ".symbols") == 0)
 723                         continue;
 724                 read_kld(p->fts_path, p->fts_name);
 725         }
 726         fts_close(ftsp);
 727         return (0);
 728 }