usr.bin/ar/read.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2007 Kai Wang
   5  * Copyright (c) 2007 Tim Kientzle
   6  * All rights reserved.
   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  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/queue.h>
  34 #include <sys/stat.h>
  35 #include <archive.h>
  36 #include <archive_entry.h>
  37 #include <errno.h>
  38 #include <libgen.h>
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <sysexits.h>
  42
  43 #include "ar.h"
  44
  45 static void read_archive(struct bsdar *bsdar, char mode);
  46
  47 void
  48 ar_mode_p(struct bsdar *bsdar)
  49 {
  50
  51         read_archive(bsdar, 'p');
  52 }
  53
  54 void
  55 ar_mode_t(struct bsdar *bsdar)
  56 {
  57
  58         read_archive(bsdar, 't');
  59 }
  60
  61 void
  62 ar_mode_x(struct bsdar *bsdar)
  63 {
  64
  65         read_archive(bsdar, 'x');
  66 }
  67
  68 /*
  69  * Handle read modes: 'x', 't' and 'p'.
  70  */
  71 static void
  72 read_archive(struct bsdar *bsdar, char mode)
  73 {
  74         struct archive           *a;
  75         struct archive_entry     *entry;
  76         struct stat               sb;
  77         struct tm                *tp;
  78         const char               *bname;
  79         const char               *name;
  80         mode_t                    md;
  81         size_t                    size;
  82         time_t                    mtime;
  83         uid_t                     uid;
  84         gid_t                     gid;
  85         char                    **av;
  86         char                      buf[25];
  87         char                      find;
  88         int                       flags, r, i;
  89
  90         if ((a = archive_read_new()) == NULL)
  91                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed");
  92         archive_read_support_format_ar(a);
  93         AC(archive_read_open_filename(a, bsdar->filename, DEF_BLKSZ));
  94
  95         for (;;) {
  96                 r = archive_read_next_header(a, &entry);
  97                 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
  98                     r == ARCHIVE_FATAL)
  99                         bsdar_warnc(bsdar, archive_errno(a), "%s",
 100                             archive_error_string(a));
 101                 if (r == ARCHIVE_EOF || r == ARCHIVE_FATAL)
 102                         break;
 103                 if (r == ARCHIVE_RETRY) {
 104                         bsdar_warnc(bsdar, 0, "Retrying...");
 105                         continue;
 106                 }
 107
 108                 if ((name = archive_entry_pathname(entry)) == NULL)
 109                         break;
 110
 111                 /* Skip pseudo members. */
 112                 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
 113                         continue;
 114
 115                 if (bsdar->argc > 0) {
 116                         find = 0;
 117                         for(i = 0; i < bsdar->argc; i++) {
 118                                 av = &bsdar->argv[i];
 119                                 if (*av == NULL)
 120                                         continue;
 121                                 if ((bname = basename(*av)) == NULL)
 122                                         bsdar_errc(bsdar, EX_SOFTWARE, errno,
 123                                             "basename failed");
 124                                 if (strcmp(bname, name) != 0)
 125                                         continue;
 126
 127                                 *av = NULL;
 128                                 find = 1;
 129                                 break;
 130                         }
 131                         if (!find)
 132                                 continue;
 133                 }
 134
 135                 if (mode == 't') {
 136                         if (bsdar->options & AR_V) {
 137                                 md = archive_entry_mode(entry);
 138                                 uid = archive_entry_uid(entry);
 139                                 gid = archive_entry_gid(entry);
 140                                 size = archive_entry_size(entry);
 141                                 mtime = archive_entry_mtime(entry);
 142                                 (void)strmode(md, buf);
 143                                 (void)fprintf(stdout, "%s %6d/%-6d %8ju ",
 144                                     buf + 1, uid, gid, (uintmax_t)size);
 145                                 tp = localtime(&mtime);
 146                                 (void)strftime(buf, sizeof(buf),
 147                                     "%b %e %H:%M %Y", tp);
 148                                 (void)fprintf(stdout, "%s %s", buf, name);
 149                         } else
 150                                 (void)fprintf(stdout, "%s", name);
 151                         r = archive_read_data_skip(a);
 152                         if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
 153                             r == ARCHIVE_FATAL) {
 154                                 (void)fprintf(stdout, "\n");
 155                                 bsdar_warnc(bsdar, archive_errno(a), "%s",
 156                                     archive_error_string(a));
 157                         }
 158
 159                         if (r == ARCHIVE_FATAL)
 160                                 break;
 161
 162                         (void)fprintf(stdout, "\n");
 163                 } else {
 164                         /* mode == 'x' || mode = 'p' */
 165                         if (mode == 'p') {
 166                                 if (bsdar->options & AR_V) {
 167                                         (void)fprintf(stdout, "\n<%s>\n\n",
 168                                             name);
 169                                         fflush(stdout);
 170                                 }
 171                                 r = archive_read_data_into_fd(a, 1);
 172                         } else {
 173                                 /* mode == 'x' */
 174                                 if (stat(name, &sb) != 0) {
 175                                         if (errno != ENOENT) {
 176                                                 bsdar_warnc(bsdar, 0,
 177                                                     "stat %s failed",
 178                                                     bsdar->filename);
 179                                                 continue;
 180                                         }
 181                                 } else {
 182                                         /* stat success, file exist */
 183                                         if (bsdar->options & AR_CC)
 184                                                 continue;
 185                                         if (bsdar->options & AR_U &&
 186                                             archive_entry_mtime(entry) <=
 187                                             sb.st_mtime)
 188                                                 continue;
 189                                 }
 190
 191                                 if (bsdar->options & AR_V)
 192                                         (void)fprintf(stdout, "x - %s\n", name);
 193                                 /* Disallow absolute paths. */
 194                                 if (name[0] == '/') {
 195                                         bsdar_warnc(bsdar, 0,
 196                                             "Absolute path '%s'", name);
 197                                         continue;
 198                                 }
 199                                 /* Basic path security flags. */
 200                                 flags = ARCHIVE_EXTRACT_SECURE_SYMLINKS |
 201                                     ARCHIVE_EXTRACT_SECURE_NODOTDOT;
 202                                 if (bsdar->options & AR_O)
 203                                         flags |= ARCHIVE_EXTRACT_TIME;
 204
 205                                 r = archive_read_extract(a, entry, flags);
 206                         }
 207
 208                         if (r)
 209                                 bsdar_warnc(bsdar, archive_errno(a), "%s",
 210                                     archive_error_string(a));
 211                 }
 212         }
 213         AC(archive_read_close(a));
 214         AC(archive_read_free(a));
 215 }