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