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, 0, "%s", archive_error_string(a));
 100                 if (r == ARCHIVE_EOF || r == ARCHIVE_FATAL)
 101                         break;
 102                 if (r == ARCHIVE_RETRY) {
 103                         bsdar_warnc(bsdar, 0, "Retrying...");
 104                         continue;
 105                 }
 106
 107                 if ((name = archive_entry_pathname(entry)) == NULL)
 108                         break;
 109
 110                 /* Skip pseudo members. */
 111                 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
 112                         continue;
 113
 114                 if (bsdar->argc > 0) {
 115                         find = 0;
 116                         for(i = 0; i < bsdar->argc; i++) {
 117                                 av = &bsdar->argv[i];
 118                                 if (*av == NULL)
 119                                         continue;
 120                                 if ((bname = basename(*av)) == NULL)
 121                                         bsdar_errc(bsdar, EX_SOFTWARE, errno,
 122                                             "basename failed");
 123                                 if (strcmp(bname, name) != 0)
 124                                         continue;
 125
 126                                 *av = NULL;
 127                                 find = 1;
 128                                 break;
 129                         }
 130                         if (!find)
 131                                 continue;
 132                 }
 133
 134                 if (mode == 't') {
 135                         if (bsdar->options & AR_V) {
 136                                 md = archive_entry_mode(entry);
 137                                 uid = archive_entry_uid(entry);
 138                                 gid = archive_entry_gid(entry);
 139                                 size = archive_entry_size(entry);
 140                                 mtime = archive_entry_mtime(entry);
 141                                 (void)strmode(md, buf);
 142                                 (void)fprintf(stdout, "%s %6d/%-6d %8ju ",
 143                                     buf + 1, uid, gid, (uintmax_t)size);
 144                                 tp = localtime(&mtime);
 145                                 (void)strftime(buf, sizeof(buf),
 146                                     "%b %e %H:%M %Y", tp);
 147                                 (void)fprintf(stdout, "%s %s", buf, name);
 148                         } else
 149                                 (void)fprintf(stdout, "%s", name);
 150                         r = archive_read_data_skip(a);
 151                         if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
 152                             r == ARCHIVE_FATAL) {
 153                                 (void)fprintf(stdout, "\n");
 154                                 bsdar_warnc(bsdar, 0, "%s",
 155                                     archive_error_string(a));
 156                         }
 157
 158                         if (r == ARCHIVE_FATAL)
 159                                 break;
 160
 161                         (void)fprintf(stdout, "\n");
 162                 } else {
 163                         /* mode == 'x' || mode = 'p' */
 164                         if (mode == 'p') {
 165                                 if (bsdar->options & AR_V) {
 166                                         (void)fprintf(stdout, "\n<%s>\n\n",
 167                                             name);
 168                                         fflush(stdout);
 169                                 }
 170                                 r = archive_read_data_into_fd(a, 1);
 171                         } else {
 172                                 /* mode == 'x' */
 173                                 if (stat(name, &sb) != 0) {
 174                                         if (errno != ENOENT) {
 175                                                 bsdar_warnc(bsdar, 0,
 176                                                     "stat %s failed",
 177                                                     bsdar->filename);
 178                                                 continue;
 179                                         }
 180                                 } else {
 181                                         /* stat success, file exist */
 182                                         if (bsdar->options & AR_CC)
 183                                                 continue;
 184                                         if (bsdar->options & AR_U &&
 185                                             archive_entry_mtime(entry) <=
 186                                             sb.st_mtime)
 187                                                 continue;
 188                                 }
 189
 190                                 if (bsdar->options & AR_V)
 191                                         (void)fprintf(stdout, "x - %s\n", name);
 192                                 /* Disallow absolute paths. */
 193                                 if (name[0] == '/') {
 194                                         bsdar_warnc(bsdar, 0,
 195                                             "Absolute path '%s'", name);
 196                                         continue;
 197                                 }
 198                                 /* Basic path security flags. */
 199                                 flags = ARCHIVE_EXTRACT_SECURE_SYMLINKS |
 200                                     ARCHIVE_EXTRACT_SECURE_NODOTDOT;
 201                                 if (bsdar->options & AR_O)
 202                                         flags |= ARCHIVE_EXTRACT_TIME;
 203
 204                                 r = archive_read_extract(a, entry, flags);
 205                         }
 206
 207                         if (r)
 208                                 bsdar_warnc(bsdar, 0, "%s",
 209                                     archive_error_string(a));
 210                 }
 211         }
 212         AC(archive_read_close(a));
 213         AC(archive_read_free(a));
 214 }