usr.bin/ar/archive.c

   1 /*-
   2  * Copyright (c) 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Hugh Smith at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)archive.c        8.3 (Berkeley) 4/2/94
  37  * $FreeBSD: src/usr.bin/ar/archive.c,v 1.10.6.1 2001/08/02 00:51:00 obrien Exp $
  38  * $DragonFly: src/usr.bin/ar/archive.c,v 1.4 2005/01/13 19:57:56 okumoto Exp $
  39  */
  40
  41 #include <sys/param.h>
  42 #include <sys/stat.h>
  43
  44 #include <ar.h>
  45 #include <dirent.h>
  46 #include <err.h>
  47 #include <errno.h>
  48 #include <fcntl.h>
  49 #include <libgen.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54
  55 #include "archive.h"
  56 #include "extern.h"
  57
  58 typedef struct ar_hdr HDR;
  59 static char hb[sizeof(HDR) + 1];        /* real header */
  60
  61 int
  62 open_archive(int mode)
  63 {
  64         int created, fd, nr;
  65         char buf[SARMAG];
  66
  67         created = 0;
  68         if (mode & O_CREAT) {
  69                 mode |= O_EXCL;
  70                 if ((fd = open(archive, mode, DEFFILEMODE)) >= 0) {
  71                         /* POSIX.2 puts create message on stderr. */
  72                         if (!(options & AR_C))
  73                                 warnx("creating archive %s", archive);
  74                         created = 1;
  75                         goto opened;
  76                 }
  77                 if (errno != EEXIST)
  78                         error(archive);
  79                 mode &= ~O_EXCL;
  80         }
  81         if ((fd = open(archive, mode, DEFFILEMODE)) < 0)
  82                 error(archive);
  83
  84         /*
  85          * Attempt to place a lock on the opened file - if we get an
  86          * error then someone is already working on this library (or
  87          * it's going across NFS).
  88          */
  89 opened: if (flock(fd, LOCK_EX|LOCK_NB) && errno != EOPNOTSUPP)
  90                 error(archive);
  91
  92         /*
  93          * If not created, O_RDONLY|O_RDWR indicates that it has to be
  94          * in archive format.
  95          */
  96         if (!created &&
  97             ((mode & O_ACCMODE) == O_RDONLY || (mode & O_ACCMODE) == O_RDWR)) {
  98                 if ((nr = read(fd, buf, SARMAG) != SARMAG)) {
  99                         if (nr >= 0)
 100                                 badfmt();
 101                         error(archive);
 102                 } else if (bcmp(buf, ARMAG, SARMAG))
 103                         badfmt();
 104         } else if (write(fd, ARMAG, SARMAG) != SARMAG)
 105                 error(archive);
 106         return (fd);
 107 }
 108
 109 void
 110 close_archive(int fd)
 111 {
 112
 113         close(fd);                      /* Implicit unlock. */
 114 }
 115
 116 /* Convert ar header field to an integer. */
 117 #define AR_ATOI(from, to, len, base) { \
 118         memmove(buf, from, len); \
 119         buf[len] = '\0'; \
 120         to = strtol(buf, (char **)NULL, base); \
 121 }
 122
 123 /*
 124  * get_arobj --
 125  *      read the archive header for this member
 126  */
 127 int
 128 get_arobj(int fd)
 129 {
 130         struct ar_hdr *hdr;
 131         int len, nr;
 132         char *p, buf[20];
 133
 134         nr = read(fd, hb, sizeof(HDR));
 135         if (nr != sizeof(HDR)) {
 136                 if (!nr)
 137                         return (0);
 138                 if (nr < 0)
 139                         error(archive);
 140                 badfmt();
 141         }
 142
 143         hdr = (struct ar_hdr *)hb;
 144         if (strncmp(hdr->ar_fmag, ARFMAG, sizeof(ARFMAG) - 1))
 145                 badfmt();
 146
 147         /* Convert the header into the internal format. */
 148 #define DECIMAL 10
 149 #define OCTAL    8
 150
 151         AR_ATOI(hdr->ar_date, chdr.date, sizeof(hdr->ar_date), DECIMAL);
 152         AR_ATOI(hdr->ar_uid, chdr.uid, sizeof(hdr->ar_uid), DECIMAL);
 153         AR_ATOI(hdr->ar_gid, chdr.gid, sizeof(hdr->ar_gid), DECIMAL);
 154         AR_ATOI(hdr->ar_mode, chdr.mode, sizeof(hdr->ar_mode), OCTAL);
 155         AR_ATOI(hdr->ar_size, chdr.size, sizeof(hdr->ar_size), DECIMAL);
 156
 157         /* Leading spaces should never happen. */
 158         if (hdr->ar_name[0] == ' ')
 159                 badfmt();
 160
 161         /*
 162          * Long name support.  Set the "real" size of the file, and the
 163          * long name flag/size.
 164          */
 165         if (!bcmp(hdr->ar_name, AR_EFMT1, sizeof(AR_EFMT1) - 1)) {
 166                 chdr.lname = len = atoi(hdr->ar_name + sizeof(AR_EFMT1) - 1);
 167                 if (len <= 0 || len > MAXNAMLEN)
 168                         badfmt();
 169                 nr = read(fd, chdr.name, len);
 170                 if (nr != len) {
 171                         if (nr < 0)
 172                                 error(archive);
 173                         badfmt();
 174                 }
 175                 chdr.name[len] = 0;
 176                 chdr.size -= len;
 177         } else {
 178                 chdr.lname = 0;
 179                 memmove(chdr.name, hdr->ar_name, sizeof(hdr->ar_name));
 180
 181                 /* Strip trailing spaces, null terminate. */
 182                 for (p = chdr.name + sizeof(hdr->ar_name) - 1; *p == ' '; --p);
 183                 *++p = '\0';
 184         }
 185         return (1);
 186 }
 187
 188 static int already_written;
 189
 190 /*
 191  * put_arobj --
 192  *      Write an archive member to a file.
 193  */
 194 void
 195 put_arobj(CF *cfp, struct stat *sb)
 196 {
 197         int lname;
 198         char *name;
 199         struct ar_hdr *hdr;
 200         off_t size;
 201
 202         /*
 203          * If passed an sb structure, reading a file from disk.  Get stat(2)
 204          * information, build a name and construct a header.  (Files are named
 205          * by their last component in the archive.)  If not, then just write
 206          * the last header read.
 207          */
 208         if (sb) {
 209                 name = basename(cfp->rname);
 210                 fstat(cfp->rfd, sb);
 211
 212                 /*
 213                  * If not truncating names and the name is too long or contains
 214                  * a space, use extended format 1.
 215                  */
 216                 lname = strlen(name);
 217                 if (options & AR_TR) {
 218                         if (lname > OLDARMAXNAME) {
 219                                 fflush(stdout);
 220                                 warnx("warning: %s truncated to %.*s",
 221                                     name, OLDARMAXNAME, name);
 222                                 fflush(stderr);
 223                         }
 224                         sprintf(hb, HDR3, name,
 225                             (long)sb->st_mtimespec.tv_sec, sb->st_uid,
 226                             sb->st_gid, sb->st_mode, sb->st_size, ARFMAG);
 227                         lname = 0;
 228                 } else if (lname > (long)sizeof(hdr->ar_name) || strchr(name, ' '))
 229                         sprintf(hb, HDR1, AR_EFMT1, lname,
 230                             (long)sb->st_mtimespec.tv_sec, sb->st_uid,
 231                             sb->st_gid, sb->st_mode, sb->st_size + lname,
 232                             ARFMAG);
 233                 else {
 234                         lname = 0;
 235                         sprintf(hb, HDR2, name,
 236                             (long)sb->st_mtimespec.tv_sec, sb->st_uid,
 237                             sb->st_gid, sb->st_mode, sb->st_size, ARFMAG);
 238                 }
 239                 size = sb->st_size;
 240         } else {
 241                 lname = chdr.lname;
 242                 name = chdr.name;
 243                 size = chdr.size;
 244         }
 245
 246         if (write(cfp->wfd, hb, sizeof(HDR)) != sizeof(HDR))
 247                 error(cfp->wname);
 248         if (lname) {
 249                 if (write(cfp->wfd, name, lname) != lname)
 250                         error(cfp->wname);
 251                 already_written = lname;
 252         }
 253         copy_ar(cfp, size);
 254         already_written = 0;
 255 }
 256
 257 /*
 258  * copy_ar --
 259  *      Copy size bytes from one file to another - taking care to handle the
 260  *      extra byte (for odd size files) when reading archives and writing an
 261  *      extra byte if necessary when adding files to archive.  The length of
 262  *      the object is the long name plus the object itself; the variable
 263  *      already_written gets set if a long name was written.
 264  *
 265  *      The padding is really unnecessary, and is almost certainly a remnant
 266  *      of early archive formats where the header included binary data which
 267  *      a PDP-11 required to start on an even byte boundary.  (Or, perhaps,
 268  *      because 16-bit word addressed copies were faster?)  Anyhow, it should
 269  *      have been ripped out long ago.
 270  */
 271 void
 272 copy_ar(CF *cfp, off_t size)
 273 {
 274         static char pad = '\n';
 275         off_t sz;
 276         int from, nr = 0, nw, off, to;
 277         char buf[8*1024];
 278
 279         if (!(sz = size))
 280                 return;
 281
 282         from = cfp->rfd;
 283         to = cfp->wfd;
 284         sz = size;
 285         while (sz && (nr = read(from, buf, MIN(sz, sizeof(buf)))) > 0) {
 286                 sz -= nr;
 287                 for (off = 0; off < nr; nr -= off, off += nw)
 288                         if ((nw = write(to, buf + off, nr)) < 0)
 289                                 error(cfp->wname);
 290         }
 291         if (sz) {
 292                 if (nr == 0)
 293                         badfmt();
 294                 error(cfp->rname);
 295         }
 296
 297         if (cfp->flags & RPAD && (size + chdr.lname) & 1 &&
 298             (nr = read(from, buf, 1)) != 1) {
 299                 if (nr == 0)
 300                         badfmt();
 301                 error(cfp->rname);
 302         }
 303         if (cfp->flags & WPAD && (size + already_written) & 1 &&
 304             write(to, &pad, 1) != 1)
 305                 error(cfp->wname);
 306 }
 307
 308 /*
 309  * skip_arobj -
 310  *      Skip over an object -- taking care to skip the pad bytes.
 311  */
 312 void
 313 skip_arobj(int fd)
 314 {
 315         off_t len;
 316
 317         len = chdr.size + ( (chdr.size + chdr.lname) & 1);
 318         if (lseek(fd, len, SEEK_CUR) == (off_t)-1)
 319                 error(archive);
 320 }