usr.bin/xinstall/xinstall.c

   1 /*
   2  * Copyright (c) 1987, 1993
   3  *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1987, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)xinstall.c       8.1 (Berkeley) 7/21/93
  31  * $FreeBSD: src/usr.bin/xinstall/xinstall.c,v 1.38.2.8 2002/08/07 16:29:48 ru Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/mman.h>
  36 #include <sys/mount.h>
  37 #include <sys/stat.h>
  38 #include <sys/wait.h>
  39
  40 #include <ctype.h>
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <grp.h>
  45 #include <paths.h>
  46 #include <pwd.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <sysexits.h>
  51 #include <unistd.h>
  52 #include <utime.h>
  53
  54 /* Bootstrap aid - this doesn't exist in most older releases */
  55 #ifndef MAP_FAILED
  56 #define MAP_FAILED ((void *)-1) /* from <sys/mman.h> */
  57 #endif
  58 #ifndef UF_NOHISTORY
  59 #define UF_NOHISTORY    0
  60 #endif
  61
  62 #define MAX_CMP_SIZE    (16 * 1024 * 1024)
  63
  64 #define DIRECTORY       0x01            /* Tell install it's a directory. */
  65 #define SETFLAGS        0x02            /* Tell install to set flags. */
  66 #define NOCHANGEBITS    (UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
  67 #define BACKUP_SUFFIX   ".old"
  68
  69 static struct passwd *pp;
  70 static struct group *gp;
  71 static gid_t gid;
  72 static uid_t uid;
  73 static int dobackup, docompare, dodir, dopreserve, dostrip, dounpriv, nommap,
  74     safecopy, verbose;
  75 static mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
  76 static const char *suffix = BACKUP_SUFFIX;
  77 static char *destdir, *fflags;
  78
  79 static int file_getgroup(const char *etcdir, const char *group, gid_t *gidret);
  80 static int file_getowner(const char *etcdir, const char *owner, uid_t *uidret);
  81
  82 static int      compare(int, const char *, size_t, int, const char *, size_t);
  83 static void     copy(int, const char *, int, const char *, off_t);
  84 static int      create_newfile(const char *, int, struct stat *);
  85 static int      create_tempfile(const char *, char *, size_t);
  86 static void     install(const char *, const char *, u_long, u_long, u_int);
  87 static void     install_dir(char *);
  88 u_long  numeric_id(const char *, const char *);
  89 static void     strip(const char *);
  90 static int      trymmap(int);
  91 static void     usage(void);
  92
  93 int
  94 main(int argc, char *argv[])
  95 {
  96         struct stat from_sb, to_sb;
  97         mode_t *set;
  98         u_long fset;
  99         u_long fclr;
 100         int ch, no_target;
 101         int trysys;
 102         u_int iflags;
 103         const char *group, *owner, *to_name;
 104         const char *etcdir;
 105
 106         fclr = 0;
 107         fset = 0;
 108         iflags = 0;
 109         trysys = 0;
 110         group = NULL;
 111         owner = NULL;
 112         etcdir = NULL;
 113
 114         while ((ch = getopt(argc, argv, "L:B:bCcD:df:g:lMm:N:o:pSsUv")) != -1)
 115                 switch((char)ch) {
 116                 case 'B':
 117                         suffix = optarg;
 118                         /* FALLTHROUGH */
 119                 case 'b':
 120                         dobackup = 1;
 121                         break;
 122                 case 'C':
 123                         docompare = 1;
 124                         break;
 125                 case 'c':
 126                         /* For backwards compatibility. */
 127                         break;
 128                 case 'D':
 129                         destdir = optarg;
 130                         break;
 131                 case 'd':
 132                         dodir = 1;
 133                         break;
 134                 case 'f':
 135                         fflags = optarg;
 136                         break;
 137                 case 'g':
 138                         group = optarg;
 139                         break;
 140                 case 'l':
 141                         trysys = 1;
 142                         break;
 143                 case 'M':
 144                         nommap = 1;
 145                         break;
 146                 case 'm':
 147                         if (!(set = setmode(optarg)))
 148                                 errx(EX_USAGE, "invalid file mode: %s",
 149                                      optarg);
 150                         mode = getmode(set, 0);
 151                         free(set);
 152                         break;
 153                 case 'L':
 154                         /* -L option kept for compatibility with pre-5.4 */
 155                         warnx("Option -L is deprecated, use -N instead");
 156                         /* FALLTHROUGH */
 157                 case 'N':
 158                         etcdir = optarg;
 159                         break;
 160                 case 'o':
 161                         owner = optarg;
 162                         break;
 163                 case 'p':
 164                         docompare = dopreserve = 1;
 165                         break;
 166                 case 'S':
 167                         safecopy = 1;
 168                         break;
 169                 case 's':
 170                         dostrip = 1;
 171                         break;
 172                 case 'U':
 173                         dounpriv = 1;
 174                         break;
 175                 case 'v':
 176                         verbose = 1;
 177                         break;
 178                 case '?':
 179                 default:
 180                         usage();
 181                 }
 182         argc -= optind;
 183         argv += optind;
 184
 185         /* some options make no sense when creating directories */
 186         if (dostrip && dodir) {
 187                 warnx("-d and -s may not be specified together");
 188                 usage();
 189         }
 190
 191         if (getenv("DONTSTRIP") != NULL) {
 192                 warnx("DONTSTRIP set - will not strip installed binaries");
 193                 dostrip = 0;
 194         }
 195
 196         /* must have at least two arguments, except when creating directories */
 197         if (argc < 2 && !dodir)
 198                 usage();
 199
 200         /* need to make a temp copy so we can compare stripped version */
 201         if (docompare && dostrip)
 202                 safecopy = 1;
 203
 204         /* no etcdir specified, always try the system */
 205         if (etcdir == NULL)
 206                 trysys = 1;
 207         uid = (uid_t)-1;
 208         gid = (gid_t)-1;
 209
 210         /* get group and owner id's */
 211         if (group != NULL && !dounpriv) {
 212                 if (etcdir && file_getgroup(etcdir, group, &gid)) {
 213                         ;
 214                 } else if (trysys && (gp = getgrnam(group)) != NULL) {
 215                         gid = gp->gr_gid;
 216                 } else {
 217                         gid = (gid_t)numeric_id(group, "group");
 218                 }
 219         }
 220
 221         if (owner != NULL && !dounpriv) {
 222                 if (etcdir && file_getowner(etcdir, owner, &uid)) {
 223                         ;
 224                 } else if (trysys && (pp = getpwnam(owner)) != NULL) {
 225                         uid = pp->pw_uid;
 226                 } else {
 227                         uid = (uid_t)numeric_id(owner, "user");
 228                 }
 229         }
 230
 231         if (fflags != NULL && !dounpriv) {
 232                 if (strtofflags(&fflags, &fset, &fclr))
 233                         errx(EX_USAGE, "%s: invalid flag", fflags);
 234                 iflags |= SETFLAGS;
 235         }
 236
 237         if (dodir) {
 238                 for (; *argv != NULL; ++argv)
 239                         install_dir(*argv);
 240                 exit(EX_OK);
 241                 /* NOTREACHED */
 242         }
 243
 244         to_name = argv[argc - 1];
 245         no_target = stat(to_name, &to_sb);
 246         if (!no_target && S_ISDIR(to_sb.st_mode)) {
 247                 for (; *argv != to_name; ++argv)
 248                         install(*argv, to_name, fset, fclr, iflags | DIRECTORY);
 249                 exit(EX_OK);
 250                 /* NOTREACHED */
 251         }
 252
 253         /* can't do file1 file2 directory/file */
 254         if (argc != 2) {
 255                 if (no_target)
 256                         warnx("target directory `%s' does not exist",
 257                             argv[argc - 1]);
 258                 else
 259                         warnx("target `%s' is not a directory",
 260                             argv[argc - 1]);
 261                 usage();
 262         }
 263
 264         if (!no_target) {
 265                 if (stat(*argv, &from_sb))
 266                         err(EX_OSERR, "%s", *argv);
 267                 if (!S_ISREG(to_sb.st_mode)) {
 268                         errno = EFTYPE;
 269                         err(EX_OSERR, "%s", to_name);
 270                 }
 271                 if (to_sb.st_dev == from_sb.st_dev &&
 272                     to_sb.st_ino == from_sb.st_ino)
 273                         errx(EX_USAGE,
 274                             "%s and %s are the same file", *argv, to_name);
 275         }
 276         install(*argv, to_name, fset, fclr, iflags);
 277         exit(EX_OK);
 278         /* NOTREACHED */
 279 }
 280
 281 u_long
 282 numeric_id(const char *name, const char *type)
 283 {
 284         u_long val;
 285         char *ep;
 286
 287         /*
 288          * XXX
 289          * We know that uid_t's and gid_t's are unsigned longs.
 290          */
 291         errno = 0;
 292         val = strtoul(name, &ep, 10);
 293         if (errno)
 294                 err(EX_NOUSER, "%s", name);
 295         if (*ep != '\0')
 296                 errx(EX_NOUSER, "unknown %s %s", type, name);
 297         return (val);
 298 }
 299
 300 static
 301 int
 302 file_getgroup(const char *etcdir, const char *group, gid_t *gidret)
 303 {
 304         FILE *fp;
 305         size_t len;
 306         size_t grlen;
 307         char *path;
 308         char *ptr;
 309         char *scan;
 310
 311         grlen = strlen(group);
 312
 313         if (asprintf(&path, "%s/group", etcdir) < 0)
 314                 errx(EX_OSERR, "asprintf()");
 315         if ((fp = fopen(path, "r")) != NULL) {
 316                 while ((ptr = fgetln(fp, &len)) != NULL && len) {
 317                         ptr[len - 1] = 0;
 318                         if ((scan = strchr(ptr, ':')) == NULL)
 319                                 continue;
 320                         if ((size_t)(scan - ptr) != grlen)
 321                                 continue;
 322                         if (strncmp(ptr, group, grlen) != 0)
 323                                 continue;
 324                         if ((scan = strchr(scan + 1, ':')) == NULL)
 325                                 continue;
 326                         *gidret = strtoul(scan + 1, NULL, 10);
 327                         break;
 328                 }
 329                 fclose(fp);
 330         }
 331         free(path);
 332         return((*gidret == (gid_t)-1) ? 0 : 1);
 333 }
 334
 335 static
 336 int
 337 file_getowner(const char *etcdir, const char *owner, uid_t *uidret)
 338 {
 339         FILE *fp;
 340         size_t len;
 341         size_t owner_len;
 342         char *path;
 343         char *ptr;
 344         char *scan;
 345
 346         owner_len = strlen(owner);
 347
 348         if (asprintf(&path, "%s/master.passwd", etcdir) < 0)
 349                 errx(EX_OSERR, "asprintf()");
 350         if ((fp = fopen(path, "r")) != NULL) {
 351                 while ((ptr = fgetln(fp, &len)) != NULL && len) {
 352                         ptr[len - 1] = 0;
 353                         if ((scan = strchr(ptr, ':')) == NULL)
 354                                 continue;
 355                         if ((size_t)(scan - ptr) != owner_len)
 356                                 continue;
 357                         if (strncmp(ptr, owner, owner_len) != 0)
 358                                 continue;
 359                         if ((scan = strchr(scan + 1, ':')) == NULL)
 360                                 continue;
 361                         *uidret = strtoul(scan + 1, NULL, 10);
 362                         break;
 363                 }
 364                 fclose(fp);
 365         }
 366         free(path);
 367         return((*uidret == (uid_t)-1) ? 0 : 1);
 368 }
 369
 370 /*
 371  * install --
 372  *      build a path name and install the file
 373  */
 374 static void
 375 install(const char *from_name, const char *to_name, u_long fset, u_long fclr,
 376         u_int flags)
 377 {
 378         struct stat from_sb, temp_sb, to_sb;
 379         struct utimbuf utb;
 380         int devnull, files_match, from_fd, serrno, target;
 381         int tempcopy, temp_fd, to_fd;
 382         u_long nfset;
 383         char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
 384
 385         files_match = 0;
 386         from_fd = -1;
 387
 388         /* If try to install NULL file to a directory, fails. */
 389         if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
 390                 if (stat(from_name, &from_sb))
 391                         err(EX_OSERR, "%s", from_name);
 392                 if (!S_ISREG(from_sb.st_mode)) {
 393                         errno = EFTYPE;
 394                         err(EX_OSERR, "%s", from_name);
 395                 }
 396                 /* Build the target path. */
 397                 if (flags & DIRECTORY) {
 398                         (void)snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
 399                             to_name,
 400                             (p = strrchr(from_name, '/')) ? ++p : from_name);
 401                         to_name = pathbuf;
 402                 }
 403                 devnull = 0;
 404         } else {
 405                 devnull = 1;
 406         }
 407
 408         target = stat(to_name, &to_sb) == 0;
 409
 410         /* Only install to regular files. */
 411         if (target && !S_ISREG(to_sb.st_mode)) {
 412                 errno = EFTYPE;
 413                 warn("%s", to_name);
 414                 return;
 415         }
 416
 417         /* Only copy safe if the target exists. */
 418         tempcopy = safecopy && target;
 419
 420         if (!devnull && (from_fd = open(from_name, O_RDONLY, 0)) < 0)
 421                 err(EX_OSERR, "%s", from_name);
 422
 423         /* If we don't strip, we can compare first. */
 424         if (docompare && !dostrip && target) {
 425                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 426                         err(EX_OSERR, "%s", to_name);
 427                 if (devnull)
 428                         files_match = to_sb.st_size == 0;
 429                 else
 430                         files_match = !(compare(from_fd, from_name,
 431                             (size_t)from_sb.st_size, to_fd,
 432                             to_name, (size_t)to_sb.st_size));
 433
 434                 /* Close "to" file unless we match. */
 435                 if (!files_match)
 436                         (void)close(to_fd);
 437         }
 438
 439         if (!files_match) {
 440                 if (tempcopy) {
 441                         to_fd = create_tempfile(to_name, tempfile,
 442                             sizeof(tempfile));
 443                         if (to_fd < 0)
 444                                 err(EX_OSERR, "%s", tempfile);
 445                 } else {
 446                         if ((to_fd = create_newfile(to_name, target,
 447                             &to_sb)) < 0)
 448                                 err(EX_OSERR, "%s", to_name);
 449                         if (verbose)
 450                                 (void)printf("install: %s -> %s\n",
 451                                     from_name, to_name);
 452                 }
 453                 if (!devnull)
 454                         copy(from_fd, from_name, to_fd,
 455                              tempcopy ? tempfile : to_name, from_sb.st_size);
 456         }
 457
 458         if (dostrip) {
 459                 strip(tempcopy ? tempfile : to_name);
 460
 461                 /*
 462                  * Re-open our fd on the target, in case we used a strip
 463                  * that does not work in-place -- like GNU binutils strip.
 464                  */
 465                 close(to_fd);
 466                 to_fd = open(tempcopy ? tempfile : to_name, O_RDONLY, 0);
 467                 if (to_fd < 0)
 468                         err(EX_OSERR, "stripping %s", to_name);
 469         }
 470
 471         /*
 472          * Compare the stripped temp file with the target.
 473          */
 474         if (docompare && dostrip && target) {
 475                 temp_fd = to_fd;
 476
 477                 /* Re-open to_fd using the real target name. */
 478                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 479                         err(EX_OSERR, "%s", to_name);
 480
 481                 if (fstat(temp_fd, &temp_sb)) {
 482                         serrno = errno;
 483                         (void)unlink(tempfile);
 484                         errno = serrno;
 485                         err(EX_OSERR, "%s", tempfile);
 486                 }
 487
 488                 if (compare(temp_fd, tempfile, (size_t)temp_sb.st_size, to_fd,
 489                             to_name, (size_t)to_sb.st_size) == 0) {
 490                         /*
 491                          * If target has more than one link we need to
 492                          * replace it in order to snap the extra links.
 493                          * Need to preserve target file times, though.
 494                          */
 495                         if (to_sb.st_nlink != 1) {
 496                                 utb.actime = to_sb.st_atime;
 497                                 utb.modtime = to_sb.st_mtime;
 498                                 utime(tempfile, &utb);
 499                         } else {
 500                                 files_match = 1;
 501                                 (void)unlink(tempfile);
 502                         }
 503                         (void) close(temp_fd);
 504                 }
 505         }
 506
 507         /*
 508          * Move the new file into place if doing a safe copy
 509          * and the files are different (or just not compared).
 510          */
 511         if (tempcopy && !files_match) {
 512                 /* Try to turn off the immutable bits. */
 513                 if (to_sb.st_flags & NOCHANGEBITS)
 514                         (void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
 515                 if (dobackup) {
 516                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s", to_name,
 517                             suffix) != strlen(to_name) + strlen(suffix)) {
 518                                 unlink(tempfile);
 519                                 errx(EX_OSERR, "%s: backup filename too long",
 520                                     to_name);
 521                         }
 522                         if (verbose)
 523                                 (void)printf("install: %s -> %s\n", to_name, backup);
 524                         if (rename(to_name, backup) < 0) {
 525                                 serrno = errno;
 526                                 unlink(tempfile);
 527                                 errno = serrno;
 528                                 err(EX_OSERR, "rename: %s to %s", to_name,
 529                                      backup);
 530                         }
 531                 }
 532                 if (verbose)
 533                         (void)printf("install: %s -> %s\n", from_name, to_name);
 534                 if (rename(tempfile, to_name) < 0) {
 535                         serrno = errno;
 536                         unlink(tempfile);
 537                         errno = serrno;
 538                         err(EX_OSERR, "rename: %s to %s",
 539                             tempfile, to_name);
 540                 }
 541
 542                 /* Re-open to_fd so we aren't hosed by the rename(2). */
 543                 (void) close(to_fd);
 544                 if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
 545                         err(EX_OSERR, "%s", to_name);
 546         }
 547
 548         /*
 549          * Preserve the timestamp of the source file if necessary.
 550          */
 551         if (dopreserve && !files_match && !devnull) {
 552                 utb.actime = from_sb.st_atime;
 553                 utb.modtime = from_sb.st_mtime;
 554                 utime(to_name, &utb);
 555         }
 556
 557         if (fstat(to_fd, &to_sb) == -1) {
 558                 serrno = errno;
 559                 (void)unlink(to_name);
 560                 errno = serrno;
 561                 err(EX_OSERR, "%s", to_name);
 562         }
 563
 564         /*
 565          * Set owner, group, mode for target; do the chown first,
 566          * chown may lose the setuid bits.
 567          */
 568         if (!dounpriv && ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 569             (uid != (uid_t)-1 && uid != to_sb.st_uid) ||
 570             (mode != to_sb.st_mode))) {
 571                 /* Try to turn off the immutable bits. */
 572                 if (to_sb.st_flags & NOCHANGEBITS)
 573                         (void)fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
 574         }
 575
 576         if (!dounpriv && (
 577             (gid != (gid_t)-1 && gid != to_sb.st_gid) ||
 578             (uid != (uid_t)-1 && uid != to_sb.st_uid)))
 579                 if (fchown(to_fd, uid, gid) == -1) {
 580                         serrno = errno;
 581                         (void)unlink(to_name);
 582                         errno = serrno;
 583                         err(EX_OSERR,"%s: chown/chgrp", to_name);
 584                 }
 585
 586         if (mode != to_sb.st_mode) {
 587                 if (fchmod(to_fd,
 588                      dounpriv ? mode & (S_IRWXU|S_IRWXG|S_IRWXO) : mode)) {
 589                         serrno = errno;
 590                         (void)unlink(to_name);
 591                         errno = serrno;
 592                         err(EX_OSERR, "%s: chmod", to_name);
 593                 }
 594         }
 595
 596         /*
 597          * If provided a set of flags, set them, otherwise, preserve the
 598          * flags, except for the dump and history flags.  The dump flag
 599          * is left clear on the target while the history flag from when
 600          * the target was created (which is inherited from the target's
 601          * parent directory) is retained.
 602          */
 603         if (flags & SETFLAGS) {
 604                 nfset = (to_sb.st_flags | fset) & ~fclr;
 605         } else {
 606                 nfset = (from_sb.st_flags & ~(UF_NODUMP | UF_NOHISTORY)) |
 607                         (to_sb.st_flags & UF_NOHISTORY);
 608         }
 609
 610         /*
 611          * NFS does not support flags.  Ignore EOPNOTSUPP flags if we're just
 612          * trying to turn off UF_NODUMP.  If we're trying to set real flags,
 613          * then warn if the fs doesn't support it, otherwise fail.
 614          */
 615         if (!dounpriv && !devnull && fchflags(to_fd, nfset)) {
 616                 if (flags & SETFLAGS) {
 617                         if (errno == EOPNOTSUPP)
 618                                 warn("%s: chflags", to_name);
 619                         else {
 620                                 serrno = errno;
 621                                 (void)unlink(to_name);
 622                                 errno = serrno;
 623                                 err(EX_OSERR, "%s: chflags", to_name);
 624                         }
 625                 }
 626         }
 627
 628         (void)close(to_fd);
 629         if (!devnull)
 630                 (void)close(from_fd);
 631 }
 632
 633 /*
 634  * compare --
 635  *      compare two files; non-zero means files differ
 636  */
 637 static int
 638 compare(int from_fd, const char *from_name __unused, size_t from_len,
 639         int to_fd, const char *to_name __unused, size_t to_len)
 640 {
 641         char *p, *q;
 642         int rv;
 643         int done_compare;
 644
 645         rv = 0;
 646         if (from_len != to_len)
 647                 return 1;
 648
 649         if (from_len <= MAX_CMP_SIZE) {
 650                 done_compare = 0;
 651                 if (trymmap(from_fd) && trymmap(to_fd)) {
 652                         p = mmap(NULL, from_len, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
 653                         if (p == (char *)MAP_FAILED)
 654                                 goto out;
 655                         q = mmap(NULL, from_len, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
 656                         if (q == (char *)MAP_FAILED) {
 657                                 munmap(p, from_len);
 658                                 goto out;
 659                         }
 660
 661                         rv = memcmp(p, q, from_len);
 662                         munmap(p, from_len);
 663                         munmap(q, from_len);
 664                         done_compare = 1;
 665                 }
 666         out:
 667                 if (!done_compare) {
 668                         char buf1[MAXBSIZE];
 669                         char buf2[MAXBSIZE];
 670                         int n1, n2;
 671
 672                         rv = 0;
 673                         lseek(from_fd, 0, SEEK_SET);
 674                         lseek(to_fd, 0, SEEK_SET);
 675                         while (rv == 0) {
 676                                 n1 = read(from_fd, buf1, sizeof(buf1));
 677                                 if (n1 == 0)
 678                                         break;          /* EOF */
 679                                 else if (n1 > 0) {
 680                                         n2 = read(to_fd, buf2, n1);
 681                                         if (n2 == n1)
 682                                                 rv = memcmp(buf1, buf2, n1);
 683                                         else
 684                                                 rv = 1; /* out of sync */
 685                                 } else
 686                                         rv = 1;         /* read failure */
 687                         }
 688                         lseek(from_fd, 0, SEEK_SET);
 689                         lseek(to_fd, 0, SEEK_SET);
 690                 }
 691         } else
 692                 rv = 1; /* don't bother in this case */
 693
 694         return rv;
 695 }
 696
 697 /*
 698  * create_tempfile --
 699  *      create a temporary file based on path and open it
 700  */
 701 static int
 702 create_tempfile(const char *path, char *temp, size_t tsize)
 703 {
 704         char *p;
 705
 706         (void)strncpy(temp, path, tsize);
 707         temp[tsize - 1] = '\0';
 708         if ((p = strrchr(temp, '/')) != NULL)
 709                 p++;
 710         else
 711                 p = temp;
 712         (void)strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
 713         temp[tsize - 1] = '\0';
 714         return (mkstemp(temp));
 715 }
 716
 717 /*
 718  * create_newfile --
 719  *      create a new file, overwriting an existing one if necessary
 720  */
 721 static int
 722 create_newfile(const char *path, int target, struct stat *sbp)
 723 {
 724         char backup[MAXPATHLEN];
 725
 726         if (target) {
 727                 /*
 728                  * Unlink now... avoid ETXTBSY errors later.  Try to turn
 729                  * off the append/immutable bits -- if we fail, go ahead,
 730                  * it might work.
 731                  */
 732                 if (sbp->st_flags & NOCHANGEBITS)
 733                         (void)chflags(path, sbp->st_flags & ~NOCHANGEBITS);
 734
 735                 if (dobackup) {
 736                         if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s",
 737                             path, suffix) != strlen(path) + strlen(suffix))
 738                                 errx(EX_OSERR, "%s: backup filename too long",
 739                                     path);
 740                         (void)snprintf(backup, MAXPATHLEN, "%s%s",
 741                             path, suffix);
 742                         if (verbose)
 743                                 (void)printf("install: %s -> %s\n",
 744                                     path, backup);
 745                         if (rename(path, backup) < 0)
 746                                 err(EX_OSERR, "rename: %s to %s", path, backup);
 747                 } else
 748                         unlink(path);
 749         }
 750
 751         return (open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR));
 752 }
 753
 754 /*
 755  * copy --
 756  *      copy from one file to another
 757  */
 758 static void
 759 copy(int from_fd, const char *from_name, int to_fd,
 760      const char *to_name, off_t size)
 761 {
 762         int nr, nw;
 763         int serrno;
 764         char *p;
 765         char buf[MAXBSIZE];
 766         int done_copy;
 767
 768         /* Rewind file descriptors. */
 769         if (lseek(from_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 770                 err(EX_OSERR, "lseek: %s", from_name);
 771         if (lseek(to_fd, (off_t)0, SEEK_SET) == (off_t)-1)
 772                 err(EX_OSERR, "lseek: %s", to_name);
 773
 774         /*
 775          * Mmap and write if less than 8M (the limit is so we don't totally
 776          * trash memory on big files.  This is really a minor hack, but it
 777          * wins some CPU back.
 778          */
 779         done_copy = 0;
 780         if (size <= 8 * 1048576 && trymmap(from_fd) &&
 781             (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
 782                     from_fd, (off_t)0)) != (char *)MAP_FAILED) {
 783                 if ((nw = write(to_fd, p, size)) != size) {
 784                         serrno = errno;
 785                         (void)unlink(to_name);
 786                         errno = nw > 0 ? EIO : serrno;
 787                         err(EX_OSERR, "%s", to_name);
 788                 }
 789                 done_copy = 1;
 790         }
 791         if (!done_copy) {
 792                 while ((nr = read(from_fd, buf, sizeof(buf))) > 0) {
 793                         if ((nw = write(to_fd, buf, nr)) != nr) {
 794                                 serrno = errno;
 795                                 (void)unlink(to_name);
 796                                 errno = nw > 0 ? EIO : serrno;
 797                                 err(EX_OSERR, "%s", to_name);
 798                         }
 799                 }
 800                 if (nr != 0) {
 801                         serrno = errno;
 802                         (void)unlink(to_name);
 803                         errno = serrno;
 804                         err(EX_OSERR, "%s", from_name);
 805                 }
 806         }
 807 }
 808
 809 /*
 810  * strip --
 811  *      use strip(1) to strip the target file
 812  */
 813 static void
 814 strip(const char *to_name)
 815 {
 816         const char *stripbin;
 817         int serrno, status;
 818
 819         switch (fork()) {
 820         case -1:
 821                 serrno = errno;
 822                 (void)unlink(to_name);
 823                 errno = serrno;
 824                 err(EX_TEMPFAIL, "fork");
 825         case 0:
 826                 stripbin = getenv("STRIPBIN");
 827                 if (stripbin == NULL)
 828                         stripbin = "strip";
 829                 execlp(stripbin, stripbin, to_name, NULL);
 830                 err(EX_OSERR, "exec(%s)", stripbin);
 831         default:
 832                 if (wait(&status) == -1 || status) {
 833                         serrno = errno;
 834                         (void)unlink(to_name);
 835                         errc(EX_SOFTWARE, serrno, "wait");
 836                         /* NOTREACHED */
 837                 }
 838         }
 839 }
 840
 841 /*
 842  * When doing a concurrent make -j N multiple install's can race the mkdir.
 843  */
 844 static
 845 int
 846 mkdir_race(const char *path, int nmode)
 847 {
 848         int res;
 849         struct stat sb;
 850
 851         res = mkdir(path, nmode);
 852         if (res < 0 && errno == EEXIST) {
 853                 if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode))
 854                         return(0);
 855                 res = mkdir(path, nmode);
 856         }
 857         return (res);
 858 }
 859
 860 /*
 861  * install_dir --
 862  *      build directory hierarchy
 863  */
 864 static void
 865 install_dir(char *path)
 866 {
 867         char *p;
 868         struct stat sb;
 869         int ch;
 870
 871         for (p = path;; ++p)
 872                 if (!*p || (p != path && *p  == '/')) {
 873                         ch = *p;
 874                         *p = '\0';
 875                         if (stat(path, &sb)) {
 876                                 if (errno != ENOENT ||
 877                                     mkdir_race(path, 0755) < 0) {
 878                                         err(EX_OSERR, "mkdir %s", path);
 879                                         /* NOTREACHED */
 880                                 } else if (verbose)
 881                                         (void)printf("install: mkdir %s\n",
 882                                                      path);
 883                         } else if (!S_ISDIR(sb.st_mode))
 884                                 errx(EX_OSERR, "%s exists but is not a directory", path);
 885                         if (!(*p = ch))
 886                                 break;
 887                 }
 888
 889         if (!dounpriv) {
 890                 if ((gid != (gid_t)-1 || uid != (uid_t)-1) &&
 891                     chown(path, uid, gid))
 892                         warn("chown %u:%u %s", uid, gid, path);
 893                 /* XXXBED: should we do the chmod in the dounpriv case? */
 894                 if (chmod(path, mode))
 895                         warn("chmod %o %s", mode, path);
 896         }
 897 }
 898
 899 /*
 900  * usage --
 901  *      print a usage message and die
 902  */
 903 static void
 904 usage(void)
 905 {
 906         fprintf(stderr,
 907 "usage: install [-bCcpSsUv] [-B suffix] [-D dest] [-f flags] [-g group]\n"
 908 "               [-N dbdir] [-m mode] [-o owner] file1 file2\n"
 909 "       install [-bCcpSsUv] [-B suffix] [-D dest] [-f flags] [-g group]\n"
 910 "               [-N dbdir] [-m mode] [-o owner] file1 ... fileN directory\n"
 911 "       install -d [-lUv] [-D dest] [-g group] [-m mode] [-N dbdir] [-o owner]\n"
 912 "               directory ...\n");
 913         exit(EX_USAGE);
 914         /* NOTREACHED */
 915 }
 916
 917 /*
 918  * trymmap --
 919  *      return true (1) if mmap should be tried, false (0) if not.
 920  */
 921 static int
 922 trymmap(int fd)
 923 {
 924 /*
 925  * The ifdef is for bootstrapping - f_fstypename doesn't exist in
 926  * pre-Lite2-merge systems.
 927  */
 928 #ifdef MFSNAMELEN
 929         struct statfs stfs;
 930
 931         if (nommap || fstatfs(fd, &stfs) != 0)
 932                 return (0);
 933         if (strcmp(stfs.f_fstypename, "ufs") == 0 ||
 934             strcmp(stfs.f_fstypename, "cd9660") == 0)
 935                 return (1);
 936 #endif
 937         return (0);
 938 }