sys/boot/common/module.c

   1 /*-
   2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
   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  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/boot/common/module.c,v 1.25 2003/08/25 23:30:41 obrien Exp $
  27  */
  28
  29 /*
  30  * file/module function dispatcher, support, etc.
  31  */
  32
  33 #include <stand.h>
  34 #include <string.h>
  35 #include <sys/param.h>
  36 #include <sys/linker.h>
  37 #include <sys/module.h>
  38 #include <sys/queue.h>
  39 #ifndef EFI
  40 #include "libi386/libi386.h"
  41 #endif
  42
  43 #include "bootstrap.h"
  44
  45 #define MDIR_REMOVED    0x0001
  46 #define MDIR_NOHINTS    0x0002
  47
  48 struct moduledir {
  49         char    *d_path;        /* path of modules directory */
  50         u_char  *d_hints;       /* content of linker.hints file */
  51         int     d_hintsz;       /* size of hints data */
  52         int     d_flags;
  53         STAILQ_ENTRY(moduledir) d_link;
  54 };
  55
  56 static int                      file_load(char *filename, vm_offset_t dest, struct preloaded_file **result);
  57 static int                      file_loadraw(char *type, char *name);
  58 static int                      file_load_dependencies(struct preloaded_file *base_mod);
  59 static char *                   file_search(const char *name, char **extlist);
  60 static struct kernel_module *   file_findmodule(struct preloaded_file *fp, char *modname, struct mod_depend *verinfo);
  61 static int                      file_havepath(const char *name);
  62 static char                     *mod_searchmodule(char *name, struct mod_depend *verinfo);
  63 static void                     file_insert_tail(struct preloaded_file *mp);
  64 struct file_metadata*           metadata_next(struct file_metadata *base_mp, int type);
  65 static void                     moduledir_readhints(struct moduledir *mdp);
  66 static void                     moduledir_rebuild(void);
  67
  68 /* load address should be tweaked by first module loaded (kernel) */
  69 static vm_offset_t      loadaddr = 0;
  70
  71 static const char       *default_searchpath ="modules;KERNEL";
  72 static const char       *local_module_path = "../modules.local";
  73
  74 static STAILQ_HEAD(, moduledir) moduledir_list = STAILQ_HEAD_INITIALIZER(moduledir_list);
  75
  76 struct preloaded_file *preloaded_files = NULL;
  77
  78 static char *kld_ext_list[] = {
  79     ".ko",
  80     "",
  81     NULL
  82 };
  83
  84 COMMAND_SET(slow, "slow", "slow print", command_slow);
  85
  86 static int slomode;
  87
  88 static int
  89 command_slow(int argc, char *argv[])
  90 {
  91         slomode = 1;
  92         return CMD_OK;
  93 }
  94
  95 void
  96 slowprint(char c)
  97 {
  98     int i;
  99
 100     if (slomode) {
 101         printf("SP-%c\n", c);
 102         for (i = 0; i < 10; ++i)
 103             delay(100000);
 104     }
 105 }
 106
 107 /*
 108  * load an object, either a disk file or code module.
 109  *
 110  * To load a file, the syntax is:
 111  *
 112  * load -t <type> <path>
 113  *
 114  * code modules are loaded as:
 115  *
 116  * load <path> <options>
 117  */
 118 COMMAND_SET(load, "load", "load a kernel or module", command_load);
 119
 120 static int
 121 command_load(int argc, char *argv[])
 122 {
 123     char        *typestr;
 124     int         dofile, dokld, ch, error;
 125
 126     dokld = dofile = 0;
 127     optind = 1;
 128     optreset = 1;
 129     typestr = NULL;
 130     if (argc == 1) {
 131         command_errmsg = "no filename specified";
 132         return(CMD_ERROR);
 133     }
 134     while ((ch = getopt(argc, argv, "kt:")) != -1) {
 135         switch(ch) {
 136         case 'k':
 137             dokld = 1;
 138             break;
 139         case 't':
 140             typestr = optarg;
 141             dofile = 1;
 142             break;
 143         case '?':
 144         default:
 145             /* getopt has already reported an error */
 146             return(CMD_OK);
 147         }
 148     }
 149     argv += (optind - 1);
 150     argc -= (optind - 1);
 151
 152     /*
 153      * Request to load a raw file?
 154      */
 155     if (dofile) {
 156         if ((argc != 2) || (typestr == NULL) || (*typestr == 0)) {
 157             command_errmsg = "invalid load type";
 158             return(CMD_ERROR);
 159         }
 160         return(file_loadraw(typestr, argv[1]));
 161     }
 162     /*
 163      * Do we have explicit KLD load ?
 164      */
 165     if (dokld || file_havepath(argv[1])) {
 166         error = mod_loadkld(argv[1], argc - 2, argv + 2);
 167         if (error == EEXIST) {
 168             snprintf(command_errbuf, sizeof(command_errbuf),
 169                 "warning: KLD '%s' already loaded", argv[1]);
 170         }
 171         return (error == 0 ? CMD_OK : CMD_ERROR);
 172     }
 173     /*
 174      * Looks like a request for a module.
 175      */
 176     error = mod_load(argv[1], NULL, argc - 2, argv + 2);
 177     if (error == EEXIST) {
 178         snprintf(command_errbuf, sizeof(command_errbuf),
 179             "warning: module '%s' already loaded", argv[1]);
 180     }
 181     return (error == 0 ? CMD_OK : CMD_ERROR);
 182 }
 183
 184 COMMAND_SET(unload, "unload", "unload all modules", command_unload);
 185
 186 static int
 187 command_unload(int argc, char *argv[])
 188 {
 189     struct preloaded_file       *fp;
 190
 191     while (preloaded_files != NULL) {
 192         fp = preloaded_files;
 193         preloaded_files = preloaded_files->f_next;
 194         file_discard(fp);
 195     }
 196     loadaddr = 0;
 197     unsetenv("kernelname");
 198     return(CMD_OK);
 199 }
 200
 201 COMMAND_SET(crc, "crc", "calculate crc for file", command_crc);
 202
 203 uint32_t iscsi_crc32(const void *buf, size_t size);
 204 uint32_t iscsi_crc32_ext(const void *buf, size_t size, uint32_t ocrc);
 205
 206 static int
 207 command_crc(int argc, char *argv[])
 208 {
 209     char        *name;
 210     char        *cp;
 211     int         i;
 212     int         fd, got, tot;
 213     int         error;
 214     uint32_t    crc;
 215     char        *buf;
 216
 217     if (argc == 1) {
 218         command_errmsg = "no filename specified";
 219         return(CMD_ERROR);
 220     }
 221     buf = malloc(8192);
 222
 223     error = 0;
 224     printf("size\tcrc\t name\n");
 225     for (i = 1; i < argc; ++i) {
 226             /* locate the file on the load path */
 227             cp = file_search(argv[i], NULL);
 228             if (cp == NULL) {
 229                 snprintf(command_errbuf, sizeof(command_errbuf),
 230                     "can't find '%s'", argv[i]);
 231                 error = CMD_ERROR;
 232                 break;
 233             }
 234             name = cp;
 235
 236             if ((fd = rel_open(name, NULL, O_RDONLY)) < 0) {
 237                 snprintf(command_errbuf, sizeof(command_errbuf),
 238                     "can't open '%s': %s", name, strerror(errno));
 239                 free(name);
 240                 error = CMD_ERROR;
 241                 break;
 242             }
 243             tot = 0;
 244             crc = 0;
 245             for (;;) {
 246                 got = read(fd, buf, 8192);
 247                 if (got == 0)
 248                         break;
 249                 if (got < 0) {
 250                         printf("error reading '%s': %s\n",
 251                                 name, strerror(errno));
 252                         break;
 253                 }
 254                 if (got == 0)
 255                         crc = iscsi_crc32(buf, got);
 256                 else
 257                         crc = iscsi_crc32_ext(buf, got, crc);
 258                 tot += got;
 259             }
 260             printf("%7d %08x %s\n", tot, crc, name);
 261             free(name);
 262             close(fd);
 263     }
 264     free (buf);
 265     if (error == 0)
 266         error = CMD_OK;
 267     return error;
 268 }
 269
 270 COMMAND_SET(lsmod, "lsmod", "list loaded modules", command_lsmod);
 271
 272 static int
 273 command_lsmod(int argc, char *argv[])
 274 {
 275     struct preloaded_file       *fp;
 276     struct kernel_module        *mp;
 277     struct file_metadata        *md;
 278     char                        lbuf[80];
 279     int                         ch, verbose;
 280
 281     verbose = 0;
 282     optind = 1;
 283     optreset = 1;
 284     while ((ch = getopt(argc, argv, "v")) != -1) {
 285         switch(ch) {
 286         case 'v':
 287             verbose = 1;
 288             break;
 289         case '?':
 290         default:
 291             /* getopt has already reported an error */
 292             return(CMD_OK);
 293         }
 294     }
 295
 296     pager_open();
 297     for (fp = preloaded_files; fp; fp = fp->f_next) {
 298         sprintf(lbuf, " %p: %s (%s, 0x%lx)\n",
 299                 (void *) fp->f_addr, fp->f_name, fp->f_type, (long) fp->f_size);
 300         pager_output(lbuf);
 301         if (fp->f_args != NULL) {
 302             pager_output("    args: ");
 303             pager_output(fp->f_args);
 304             pager_output("\n");
 305         }
 306         if (fp->f_modules) {
 307             pager_output("  modules: ");
 308             for (mp = fp->f_modules; mp; mp = mp->m_next) {
 309                 sprintf(lbuf, "%s.%d ", mp->m_name, mp->m_version);
 310                 pager_output(lbuf);
 311             }
 312             pager_output("\n");
 313         }
 314         if (verbose) {
 315             /* XXX could add some formatting smarts here to display some better */
 316             for (md = fp->f_metadata; md != NULL; md = md->md_next) {
 317                 sprintf(lbuf, "      0x%04x, 0x%lx\n", md->md_type, (long) md->md_size);
 318                 pager_output(lbuf);
 319             }
 320         }
 321     }
 322     pager_close();
 323     return(CMD_OK);
 324 }
 325
 326 /*
 327  * File level interface, functions file_*
 328  */
 329 int
 330 file_load(char *filename, vm_offset_t dest, struct preloaded_file **result)
 331 {
 332     struct preloaded_file *fp;
 333     int error;
 334     int i;
 335
 336     error = EFTYPE;
 337     for (i = 0, fp = NULL; file_formats[i] && fp == NULL; i++) {
 338         error = (file_formats[i]->l_load)(filename, loadaddr, &fp);
 339         if (error == 0) {
 340             fp->f_loader = i;           /* remember the loader */
 341             *result = fp;
 342             break;
 343         }
 344         if (error == EFTYPE)
 345             continue;           /* Unknown to this handler? */
 346         if (error) {
 347             snprintf(command_errbuf, sizeof(command_errbuf),
 348                 "can't load file '%s': %s", filename, strerror(error));
 349             break;
 350         }
 351     }
 352     return (error);
 353 }
 354
 355 static int
 356 file_load_dependencies(struct preloaded_file *base_file)
 357 {
 358     struct file_metadata *md;
 359     struct preloaded_file *fp;
 360     struct mod_depend *verinfo;
 361     struct kernel_module *mp;
 362     char *dmodname;
 363     int error;
 364
 365     md = file_findmetadata(base_file, MODINFOMD_DEPLIST);
 366     if (md == NULL)
 367         return (0);
 368     error = 0;
 369     do {
 370         verinfo = (struct mod_depend*)md->md_data;
 371         dmodname = (char *)(verinfo + 1);
 372         if (file_findmodule(NULL, dmodname, verinfo) == NULL) {
 373             printf("loading required module '%s'\n", dmodname);
 374             error = mod_load(dmodname, verinfo, 0, NULL);
 375             if (error)
 376                 break;
 377             /*
 378              * If module loaded via kld name which isn't listed
 379              * in the linker.hints file, we should check if it have
 380              * required version.
 381              */
 382             mp = file_findmodule(NULL, dmodname, verinfo);
 383             if (mp == NULL) {
 384                 snprintf(command_errbuf, sizeof(command_errbuf),
 385                     "module '%s' exists but with wrong version", dmodname);
 386                 error = ENOENT;
 387                 break;
 388             }
 389         }
 390         md = metadata_next(md, MODINFOMD_DEPLIST);
 391     } while (md);
 392     if (!error)
 393         return (0);
 394     /* Load failed; discard everything */
 395     while (base_file != NULL) {
 396         fp = base_file;
 397         base_file = base_file->f_next;
 398         file_discard(fp);
 399     }
 400     return (error);
 401 }
 402
 403 /*
 404  * We've been asked to load (name) as (type), so just suck it in,
 405  * no arguments or anything.
 406  */
 407 int
 408 file_loadraw(char *type, char *name)
 409 {
 410     struct preloaded_file       *fp;
 411     char                        *cp;
 412     int                         fd, got;
 413     vm_offset_t                 laddr;
 414
 415     /* We can't load first */
 416     if ((file_findfile(NULL, NULL)) == NULL) {
 417         command_errmsg = "can't load file before kernel";
 418         return(CMD_ERROR);
 419     }
 420
 421     /* locate the file on the load path */
 422     cp = file_search(name, NULL);
 423     if (cp == NULL) {
 424         snprintf(command_errbuf, sizeof(command_errbuf),
 425             "can't find '%s'", name);
 426         return(CMD_ERROR);
 427     }
 428     name = cp;
 429
 430     if ((fd = rel_open(name, NULL, O_RDONLY)) < 0) {
 431         snprintf(command_errbuf, sizeof(command_errbuf),
 432             "can't open '%s': %s", name, strerror(errno));
 433         free(name);
 434         return(CMD_ERROR);
 435     }
 436
 437     laddr = loadaddr;
 438     for (;;) {
 439         /* read in 4k chunks; size is not really important */
 440 #ifndef EFI
 441         if (laddr + 4096 > heapbase) {
 442             snprintf(command_errbuf, sizeof(command_errbuf),
 443                 "error reading '%s': out of load memory", name);
 444             free(name);
 445             close(fd);
 446             return(CMD_ERROR);
 447         }
 448 #endif
 449         got = archsw.arch_readin(fd, laddr, 4096);
 450         if (got == 0)                           /* end of file */
 451             break;
 452         if (got < 0) {                          /* error */
 453             snprintf(command_errbuf, sizeof(command_errbuf),
 454                 "error reading '%s': %s", name, strerror(errno));
 455             free(name);
 456             close(fd);
 457             return(CMD_ERROR);
 458         }
 459         laddr += got;
 460     }
 461
 462     /* Looks OK so far; create & populate control structure */
 463     fp = file_alloc();
 464     fp->f_name = name;
 465     fp->f_type = strdup(type);
 466     fp->f_args = NULL;
 467     fp->f_metadata = NULL;
 468     fp->f_loader = -1;
 469     fp->f_addr = loadaddr;
 470     fp->f_size = laddr - loadaddr;
 471
 472     /* recognise space consumption */
 473     loadaddr = laddr;
 474
 475     /* Add to the list of loaded files */
 476     file_insert_tail(fp);
 477     close(fd);
 478     return(CMD_OK);
 479 }
 480
 481 /*
 482  * Load the module (name), pass it (argc),(argv), add container file
 483  * to the list of loaded files.
 484  * If module is already loaded just assign new argc/argv.
 485  */
 486 int
 487 mod_load(char *modname, struct mod_depend *verinfo, int argc, char *argv[])
 488 {
 489     struct kernel_module        *mp;
 490     int                         err;
 491     char                        *filename;
 492
 493     if (file_havepath(modname)) {
 494         printf("Warning: mod_load() called instead of mod_loadkld() for module '%s'\n", modname);
 495         return (mod_loadkld(modname, argc, argv));
 496     }
 497     /* see if module is already loaded */
 498     mp = file_findmodule(NULL, modname, verinfo);
 499     if (mp) {
 500 #ifdef moduleargs
 501         if (mp->m_args)
 502             free(mp->m_args);
 503         mp->m_args = unargv(argc, argv);
 504 #endif
 505         snprintf(command_errbuf, sizeof(command_errbuf),
 506             "warning: module '%s' already loaded", mp->m_name);
 507         return (0);
 508     }
 509     /* locate file with the module on the search path */
 510     filename = mod_searchmodule(modname, verinfo);
 511     if (filename == NULL) {
 512         snprintf(command_errbuf, sizeof(command_errbuf),
 513             "can't find '%s'", modname);
 514         return (ENOENT);
 515     }
 516     err = mod_loadkld(filename, argc, argv);
 517     return (err);
 518 }
 519
 520 /*
 521  * Load specified KLD. If path is omitted, then try to locate it via
 522  * search path.
 523  */
 524 int
 525 mod_loadkld(const char *kldname, int argc, char *argv[])
 526 {
 527     struct preloaded_file       *fp, *last_file;
 528     int                         err;
 529     char                        *filename;
 530
 531     /*
 532      * Get fully qualified KLD name
 533      */
 534     filename = file_search(kldname, kld_ext_list);
 535     if (filename == NULL) {
 536         snprintf(command_errbuf, sizeof(command_errbuf),
 537             "can't find '%s'", kldname);
 538         return (ENOENT);
 539     }
 540     /*
 541      * Check if KLD already loaded
 542      */
 543     fp = file_findfile(filename, NULL);
 544     if (fp) {
 545         snprintf(command_errbuf, sizeof(command_errbuf),
 546             "warning: KLD '%s' already loaded", filename);
 547         free(filename);
 548         return (0);
 549     }
 550     for (last_file = preloaded_files;
 551          last_file != NULL && last_file->f_next != NULL;
 552          last_file = last_file->f_next)
 553         ;
 554
 555     do {
 556         err = file_load(filename, loadaddr, &fp);
 557         if (err)
 558             break;
 559         fp->f_args = unargv(argc, argv);
 560         loadaddr = fp->f_addr + fp->f_size;
 561         file_insert_tail(fp);           /* Add to the list of loaded files */
 562         if (file_load_dependencies(fp) != 0) {
 563             err = ENOENT;
 564             last_file->f_next = NULL;
 565             loadaddr = last_file->f_addr + last_file->f_size;
 566             fp = NULL;
 567             break;
 568         }
 569     } while(0);
 570     if (err == EFTYPE)
 571         snprintf(command_errbuf, sizeof(command_errbuf),
 572             "don't know how to load module '%s'", filename);
 573     if (err && fp)
 574         file_discard(fp);
 575     free(filename);
 576     return (err);
 577 }
 578
 579 /*
 580  * Find a file matching (name) and (type).
 581  * NULL may be passed as a wildcard to either.
 582  */
 583 struct preloaded_file *
 584 file_findfile(char *name, char *type)
 585 {
 586     struct preloaded_file *fp;
 587
 588     for (fp = preloaded_files; fp != NULL; fp = fp->f_next) {
 589         if (((name == NULL) || !strcmp(name, fp->f_name)) &&
 590             ((type == NULL) || !strcmp(type, fp->f_type)))
 591             break;
 592     }
 593     return (fp);
 594 }
 595
 596 /*
 597  * Find a module matching (name) inside of given file.
 598  * NULL may be passed as a wildcard.
 599  */
 600 struct kernel_module *
 601 file_findmodule(struct preloaded_file *fp, char *modname,
 602         struct mod_depend *verinfo)
 603 {
 604     struct kernel_module *mp, *best;
 605     int bestver, mver;
 606
 607     if (fp == NULL) {
 608         for (fp = preloaded_files; fp; fp = fp->f_next) {
 609             mp = file_findmodule(fp, modname, verinfo);
 610             if (mp)
 611                 return (mp);
 612         }
 613         return (NULL);
 614     }
 615     best = NULL;
 616     bestver = 0;
 617     for (mp = fp->f_modules; mp; mp = mp->m_next) {
 618         if (strcmp(modname, mp->m_name) == 0) {
 619             if (verinfo == NULL)
 620                 return (mp);
 621             mver = mp->m_version;
 622             if (mver == verinfo->md_ver_preferred)
 623                 return (mp);
 624             if (mver >= verinfo->md_ver_minimum &&
 625                 mver <= verinfo->md_ver_maximum &&
 626                 mver > bestver) {
 627                 best = mp;
 628                 bestver = mver;
 629             }
 630         }
 631     }
 632     return (best);
 633 }
 634 /*
 635  * Make a copy of (size) bytes of data from (p), and associate them as
 636  * metadata of (type) to the module (mp).
 637  */
 638 void
 639 file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p)
 640 {
 641     struct file_metadata        *md;
 642
 643     md = malloc(sizeof(struct file_metadata) - sizeof(md->md_data) + size);
 644     md->md_size = size;
 645     md->md_type = type;
 646     bcopy(p, md->md_data, size);
 647     md->md_next = fp->f_metadata;
 648     fp->f_metadata = md;
 649 }
 650
 651 /*
 652  * Find a metadata object of (type) associated with the file (fp)
 653  */
 654 struct file_metadata *
 655 file_findmetadata(struct preloaded_file *fp, int type)
 656 {
 657     struct file_metadata *md;
 658
 659     for (md = fp->f_metadata; md != NULL; md = md->md_next)
 660         if (md->md_type == type)
 661             break;
 662     return(md);
 663 }
 664
 665 struct file_metadata *
 666 metadata_next(struct file_metadata *md, int type)
 667 {
 668     if (md == NULL)
 669         return (NULL);
 670     while((md = md->md_next) != NULL)
 671         if (md->md_type == type)
 672             break;
 673     return (md);
 674 }
 675
 676 static char *emptyextlist[] = { "", NULL };
 677
 678 /*
 679  * Check if the given file is in place and return full path to it.
 680  */
 681 static char *
 682 file_lookup(const char *path, const char *name, int namelen, char **extlist)
 683 {
 684     struct stat st;
 685     char        *result, *cp, **cpp;
 686     size_t      pathlen, extlen;
 687
 688     pathlen = strlen(path);
 689     extlen = 0;
 690     if (extlist == NULL)
 691         extlist = emptyextlist;
 692     for (cpp = extlist; *cpp; cpp++)
 693         extlen = MAX(extlen, strlen(*cpp));
 694     result = malloc(pathlen + namelen + extlen + 2 + 7 + 1);
 695     if (result == NULL)
 696         return (NULL);
 697     bcopy(path, result, pathlen);
 698     if (pathlen > 0 && result[pathlen - 1] != '/')
 699         result[pathlen++] = '/';
 700     cp = result + pathlen;
 701     bcopy(name, cp, namelen);
 702     cp += namelen;
 703     for (cpp = extlist; *cpp; cpp++) {
 704         strcpy(cp, *cpp);
 705         if (rel_stat(result, &st) == 0) {
 706             if (S_ISREG(st.st_mode)) {
 707                 return result;
 708             } else if (S_ISDIR(st.st_mode)) {
 709                 strcat(result, "/kernel");
 710                 if (rel_stat(result, &st) == 0 && S_ISREG(st.st_mode)) {
 711                     return result;
 712                 }
 713             }
 714         }
 715     }
 716     free(result);
 717     return NULL;
 718 }
 719
 720 /*
 721  * Check if file name have any qualifiers
 722  */
 723 static int
 724 file_havepath(const char *name)
 725 {
 726     const char          *cp;
 727
 728     archsw.arch_getdev(NULL, name, &cp);
 729     return (cp != name || strchr(name, '/') != NULL);
 730 }
 731
 732 /*
 733  * Attempt to find the file (name) on the module searchpath.
 734  * If (name) is qualified in any way, we simply check it and
 735  * return it or NULL.  If it is not qualified, then we attempt
 736  * to construct a path using entries in the environment variable
 737  * module_path.
 738  *
 739  * The path we return a pointer to need never be freed, as we manage
 740  * it internally.
 741  */
 742 static char *
 743 file_search(const char *name, char **extlist)
 744 {
 745     struct moduledir    *mdp;
 746     struct stat         sb;
 747     char                *result;
 748     int                 namelen;
 749
 750     /* Don't look for nothing */
 751     if (name == NULL)
 752         return(NULL);
 753
 754     if (*name == 0)
 755         return(strdup(name));
 756
 757     /*
 758      * Qualified name.  If it is a directory tag on
 759      * a "/kernel" to it.
 760      */
 761     if (file_havepath(name)) {
 762         /* Qualified, so just see if it exists */
 763         if (rel_stat(name, &sb) == 0) {
 764             if (S_ISDIR(sb.st_mode)) {
 765                 result = malloc(strlen(name) + 7 + 1);
 766                 sprintf(result, "%s/kernel", name);
 767                 return(result);
 768             } else {
 769                 return(strdup(name));
 770             }
 771         }
 772         return(NULL);
 773     }
 774     moduledir_rebuild();
 775     result = NULL;
 776     namelen = strlen(name);
 777     STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
 778         result = file_lookup(mdp->d_path, name, namelen, extlist);
 779         if (result)
 780             break;
 781     }
 782     return(result);
 783 }
 784
 785 #define INT_ALIGN(base, ptr) \
 786         ptr = (base) + roundup2((ptr) - (base), sizeof(int))
 787
 788 static char *
 789 mod_search_hints(struct moduledir *mdp, const char *modname,
 790         struct mod_depend *verinfo)
 791 {
 792     u_char      *cp, *recptr, *bufend, *best;
 793     char        *result;
 794     int         *intp, bestver, blen, clen, found, ival, modnamelen, reclen;
 795
 796     moduledir_readhints(mdp);
 797     modnamelen = strlen(modname);
 798     found = 0;
 799     result = NULL;
 800     bestver = 0;
 801     if (mdp->d_hints == NULL)
 802         goto bad;
 803     recptr = mdp->d_hints;
 804     bufend = recptr + mdp->d_hintsz;
 805     clen = blen = 0;
 806     best = cp = NULL;
 807     while (recptr < bufend && !found) {
 808         intp = (int*)recptr;
 809         reclen = *intp++;
 810         ival = *intp++;
 811         cp = (char*)intp;
 812         switch (ival) {
 813         case MDT_VERSION:
 814             clen = *cp++;
 815             if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
 816                 break;
 817             cp += clen;
 818             INT_ALIGN(mdp->d_hints, cp);
 819             ival = *(int*)cp;
 820             cp += sizeof(int);
 821             clen = *cp++;
 822             if (verinfo == NULL || ival == verinfo->md_ver_preferred) {
 823                 found = 1;
 824                 break;
 825             }
 826             if (ival >= verinfo->md_ver_minimum &&
 827                 ival <= verinfo->md_ver_maximum &&
 828                 ival > bestver) {
 829                 bestver = ival;
 830                 best = cp;
 831                 blen = clen;
 832             }
 833             break;
 834         default:
 835             break;
 836         }
 837         recptr += reclen + sizeof(int);
 838     }
 839     /*
 840      * Finally check if KLD is in the place
 841      */
 842     if (found)
 843         result = file_lookup(mdp->d_path, cp, clen, NULL);
 844     else if (best)
 845         result = file_lookup(mdp->d_path, best, blen, NULL);
 846 bad:
 847     /*
 848      * If nothing found or hints is absent - fallback to the old way
 849      * by using "kldname[.ko]" as module name.
 850      */
 851     if (!found && !bestver && result == NULL)
 852         result = file_lookup(mdp->d_path, modname, modnamelen, kld_ext_list);
 853     return result;
 854 }
 855
 856 /*
 857  * Attempt to locate the file containing the module (name)
 858  */
 859 static char *
 860 mod_searchmodule(char *name, struct mod_depend *verinfo)
 861 {
 862     struct      moduledir *mdp;
 863     char        *result;
 864
 865     moduledir_rebuild();
 866     /*
 867      * Now we ready to lookup module in the given directories
 868      */
 869     result = NULL;
 870     STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
 871         result = mod_search_hints(mdp, name, verinfo);
 872         if (result)
 873             break;
 874     }
 875
 876     return(result);
 877 }
 878
 879 int
 880 file_addmodule(struct preloaded_file *fp, char *modname, int version,
 881         struct kernel_module **newmp)
 882 {
 883     struct kernel_module *mp;
 884     struct mod_depend mdepend;
 885
 886     bzero(&mdepend, sizeof(mdepend));
 887     mdepend.md_ver_preferred = version;
 888     mp = file_findmodule(fp, modname, &mdepend);
 889     if (mp)
 890         return (EEXIST);
 891     mp = malloc(sizeof(struct kernel_module));
 892     if (mp == NULL)
 893         return (ENOMEM);
 894     bzero(mp, sizeof(struct kernel_module));
 895     mp->m_name = strdup(modname);
 896     mp->m_version = version;
 897     mp->m_fp = fp;
 898     mp->m_next = fp->f_modules;
 899     fp->f_modules = mp;
 900     if (newmp)
 901         *newmp = mp;
 902     return (0);
 903 }
 904
 905 /*
 906  * Throw a file away
 907  */
 908 void
 909 file_discard(struct preloaded_file *fp)
 910 {
 911     struct file_metadata        *md, *md1;
 912     struct kernel_module        *mp, *mp1;
 913     if (fp == NULL)
 914         return;
 915     md = fp->f_metadata;
 916     while (md) {
 917         md1 = md;
 918         md = md->md_next;
 919         free(md1);
 920     }
 921     mp = fp->f_modules;
 922     while (mp) {
 923         if (mp->m_name)
 924             free(mp->m_name);
 925         mp1 = mp;
 926         mp = mp->m_next;
 927         free(mp1);
 928     }
 929     if (fp->f_name != NULL)
 930         free(fp->f_name);
 931     if (fp->f_type != NULL)
 932         free(fp->f_type);
 933     if (fp->f_args != NULL)
 934         free(fp->f_args);
 935     free(fp);
 936 }
 937
 938 /*
 939  * Allocate a new file; must be used instead of malloc()
 940  * to ensure safe initialisation.
 941  */
 942 struct preloaded_file *
 943 file_alloc(void)
 944 {
 945     struct preloaded_file       *fp;
 946
 947     if ((fp = malloc(sizeof(struct preloaded_file))) != NULL) {
 948         bzero(fp, sizeof(struct preloaded_file));
 949     }
 950     return (fp);
 951 }
 952
 953 /*
 954  * Add a module to the chain
 955  */
 956 static void
 957 file_insert_tail(struct preloaded_file *fp)
 958 {
 959     struct preloaded_file       *cm;
 960
 961     /* Append to list of loaded file */
 962     fp->f_next = NULL;
 963     if (preloaded_files == NULL) {
 964         preloaded_files = fp;
 965     } else {
 966         for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next)
 967             ;
 968         cm->f_next = fp;
 969     }
 970 }
 971
 972 static char *
 973 moduledir_fullpath(struct moduledir *mdp, const char *fname)
 974 {
 975     char *cp;
 976
 977     cp = malloc(strlen(mdp->d_path) + strlen(fname) + 2);
 978     if (cp == NULL)
 979         return NULL;
 980     strcpy(cp, mdp->d_path);
 981     strcat(cp, "/");
 982     strcat(cp, fname);
 983     return (cp);
 984 }
 985
 986 /*
 987  * Read linker.hints file into memory performing some sanity checks.
 988  */
 989 static void
 990 moduledir_readhints(struct moduledir *mdp)
 991 {
 992     struct stat st;
 993     char        *path;
 994     int         fd, size, version;
 995
 996     if (mdp->d_hints != NULL || (mdp->d_flags & MDIR_NOHINTS))
 997         return;
 998     path = moduledir_fullpath(mdp, "linker.hints");
 999     if (rel_stat(path, &st) != 0 ||
1000         st.st_size < (ssize_t)(sizeof(version) + sizeof(int)) ||
1001         st.st_size > 100 * 1024 || (fd = rel_open(path, NULL, O_RDONLY)) < 0) {
1002         free(path);
1003         mdp->d_flags |= MDIR_NOHINTS;
1004         return;
1005     }
1006     free(path);
1007     size = read(fd, &version, sizeof(version));
1008     if (size != sizeof(version) || version != LINKER_HINTS_VERSION)
1009         goto bad;
1010     size = st.st_size - size;
1011     mdp->d_hints = malloc(size);
1012     if (mdp->d_hints == NULL)
1013         goto bad;
1014     if (read(fd, mdp->d_hints, size) != size)
1015         goto bad;
1016     mdp->d_hintsz = size;
1017     close(fd);
1018     return;
1019 bad:
1020     close(fd);
1021     if (mdp->d_hints) {
1022         free(mdp->d_hints);
1023         mdp->d_hints = NULL;
1024     }
1025     mdp->d_flags |= MDIR_NOHINTS;
1026 }
1027
1028 /*
1029  * Extract directories from the ';' separated list, remove duplicates.
1030  */
1031 static void
1032 moduledir_rebuild(void)
1033 {
1034     struct      moduledir *mdp, *mtmp;
1035     const char  *path, *cp, *ep, *modlocal;
1036     size_t      cplen;
1037
1038     path = getenv("module_path");
1039     if (path == NULL)
1040         path = default_searchpath;
1041     /*
1042      * Rebuild list of module directories if it changed
1043      */
1044     STAILQ_FOREACH(mdp, &moduledir_list, d_link)
1045         mdp->d_flags |= MDIR_REMOVED;
1046
1047     for (ep = path; *ep != 0;  ep++) {
1048         cp = ep;
1049         for (; *ep != 0 && *ep != ';'; ep++)
1050             ;
1051         /*
1052          * Ignore trailing slashes
1053          */
1054         for (cplen = ep - cp; cplen > 1 && cp[cplen - 1] == '/'; cplen--)
1055             ;
1056         STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
1057             if (strlen(mdp->d_path) != cplen || bcmp(cp, mdp->d_path, cplen) != 0)
1058                 continue;
1059             mdp->d_flags &= ~MDIR_REMOVED;
1060             break;
1061         }
1062         if (mdp == NULL) {
1063             mdp = malloc(sizeof(*mdp) + cplen + 1);
1064             if (mdp == NULL)
1065                 return;
1066             mdp->d_path = (char*)(mdp + 1);
1067             bcopy(cp, mdp->d_path, cplen);
1068             mdp->d_path[cplen] = 0;
1069             mdp->d_hints = NULL;
1070             mdp->d_flags = 0;
1071             STAILQ_INSERT_TAIL(&moduledir_list, mdp, d_link);
1072         }
1073         if (*ep == 0)
1074             break;
1075     }
1076     /*
1077      * Include modules.local if requested
1078      */
1079     modlocal = getenv("local_modules");
1080     if (modlocal != NULL && strcmp(modlocal, "YES") == 0) {
1081         cp = local_module_path;
1082         cplen = strlen(local_module_path);
1083         STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
1084             if (strlen(mdp->d_path) != cplen || bcmp(cp, mdp->d_path, cplen) != 0)
1085                 continue;
1086             mdp->d_flags &= ~MDIR_REMOVED;
1087             break;
1088         }
1089         if (mdp == NULL) {
1090             mdp = malloc(sizeof(*mdp) + cplen + 1);
1091             if (mdp == NULL)
1092                 return;
1093             mdp->d_path = (char*)(mdp + 1);
1094             bcopy(local_module_path, mdp->d_path, cplen);
1095             mdp->d_path[cplen] = 0;
1096             mdp->d_hints = NULL;
1097             mdp->d_flags = 0;
1098             STAILQ_INSERT_TAIL(&moduledir_list, mdp, d_link);
1099         }
1100     }
1101     /*
1102      * Delete unused directories if any
1103      */
1104     mdp = STAILQ_FIRST(&moduledir_list);
1105     while (mdp) {
1106         if ((mdp->d_flags & MDIR_REMOVED) == 0) {
1107             mdp = STAILQ_NEXT(mdp, d_link);
1108         } else {
1109             if (mdp->d_hints)
1110                 free(mdp->d_hints);
1111             mtmp = mdp;
1112             mdp = STAILQ_NEXT(mdp, d_link);
1113             STAILQ_REMOVE(&moduledir_list, mtmp, moduledir, d_link);
1114             free(mtmp);
1115         }
1116     }
1117 }