usr.sbin/kldxref/kldxref.c

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