usr.bin/ar/read.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   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 <assert.h>
  38 #include <errno.h>
  39 #include <libgen.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44 #include "ar.h"
  45
  46 /*
  47  * Handle read modes: 'x', 't' and 'p'.
  48  */
  49 int
  50 ar_read_archive(struct bsdar *bsdar, int mode, FILE *out)
  51 {
  52         struct archive           *a;
  53         struct archive_entry     *entry;
  54         struct stat               sb;
  55         struct tm                *tp;
  56         const char               *bname;
  57         const char               *name;
  58         mode_t                    md;
  59         size_t                    size;
  60         time_t                    mtime;
  61         uid_t                     uid;
  62         gid_t                     gid;
  63         char                    **av;
  64         char                      buf[25];
  65         char                      find;
  66         int                       exitcode, flags, r, i;
  67
  68         assert(mode == 'p' || mode == 't' || mode == 'x');
  69
  70         if ((a = archive_read_new()) == NULL)
  71                 bsdar_errc(bsdar, 0, "archive_read_new failed");
  72         archive_read_support_format_ar(a);
  73         AC(archive_read_open_filename(a, bsdar->filename, DEF_BLKSZ));
  74
  75         exitcode = EXIT_SUCCESS;
  76
  77         for (;;) {
  78                 r = archive_read_next_header(a, &entry);
  79                 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
  80                     r == ARCHIVE_FATAL)
  81                         bsdar_warnc(bsdar, archive_errno(a), "%s",
  82                             archive_error_string(a));
  83                 if (r == ARCHIVE_EOF || r == ARCHIVE_FATAL)
  84                         break;
  85                 if (r == ARCHIVE_RETRY) {
  86                         bsdar_warnc(bsdar, 0, "Retrying...");
  87                         continue;
  88                 }
  89
  90                 if ((name = archive_entry_pathname(entry)) == NULL)
  91                         break;
  92
  93                 /* Skip pseudo members. */
  94                 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0 ||
  95                     strcmp(name, "/SYM64/") == 0)
  96                         continue;
  97
  98                 if (bsdar->argc > 0) {
  99                         find = 0;
 100                         for(i = 0; i < bsdar->argc; i++) {
 101                                 av = &bsdar->argv[i];
 102                                 if (*av == NULL)
 103                                         continue;
 104                                 if ((bname = basename(*av)) == NULL)
 105                                         bsdar_errc(bsdar, errno,
 106                                             "basename failed");
 107                                 if (strcmp(bname, name) != 0)
 108                                         continue;
 109
 110                                 *av = NULL;
 111                                 find = 1;
 112                                 break;
 113                         }
 114                         if (!find)
 115                                 continue;
 116                 }
 117
 118                 if (mode == 't') {
 119                         if (bsdar->options & AR_V) {
 120                                 md = archive_entry_mode(entry);
 121                                 uid = archive_entry_uid(entry);
 122                                 gid = archive_entry_gid(entry);
 123                                 size = archive_entry_size(entry);
 124                                 mtime = archive_entry_mtime(entry);
 125                                 (void)strmode(md, buf);
 126                                 (void)fprintf(out, "%s %6d/%-6d %8ju ",
 127                                     buf + 1, uid, gid, (uintmax_t)size);
 128                                 tp = localtime(&mtime);
 129                                 (void)strftime(buf, sizeof(buf),
 130                                     "%b %e %H:%M %Y", tp);
 131                                 (void)fprintf(out, "%s %s", buf, name);
 132                         } else
 133                                 (void)fprintf(out, "%s", name);
 134                         r = archive_read_data_skip(a);
 135                         if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
 136                             r == ARCHIVE_FATAL) {
 137                                 (void)fprintf(out, "\n");
 138                                 bsdar_warnc(bsdar, archive_errno(a), "%s",
 139                                     archive_error_string(a));
 140                         }
 141
 142                         if (r == ARCHIVE_FATAL)
 143                                 break;
 144
 145                         (void)fprintf(out, "\n");
 146                 } else {
 147                         /* mode == 'x' || mode = 'p' */
 148                         if (mode == 'p') {
 149                                 if (bsdar->options & AR_V) {
 150                                         (void)fprintf(out, "\n<%s>\n\n",
 151                                             name);
 152                                         fflush(out);
 153                                 }
 154                                 r = archive_read_data_into_fd(a, 1);
 155                         } else {
 156                                 /* mode == 'x' */
 157                                 if (stat(name, &sb) != 0) {
 158                                         if (errno != ENOENT) {
 159                                                 bsdar_warnc(bsdar, 0,
 160                                                     "stat %s failed",
 161                                                     bsdar->filename);
 162                                                 continue;
 163                                         }
 164                                 } else {
 165                                         /* stat success, file exist */
 166                                         if (bsdar->options & AR_CC)
 167                                                 continue;
 168                                         if (bsdar->options & AR_U &&
 169                                             archive_entry_mtime(entry) <=
 170                                             sb.st_mtime)
 171                                                 continue;
 172                                 }
 173
 174                                 if (bsdar->options & AR_V)
 175                                         (void)fprintf(out, "x - %s\n", name);
 176                                 /* Disallow absolute paths. */
 177                                 if (name[0] == '/') {
 178                                         bsdar_warnc(bsdar, 0,
 179                                             "Absolute path '%s'", name);
 180                                         continue;
 181                                 }
 182                                 /* Basic path security flags. */
 183                                 flags = ARCHIVE_EXTRACT_SECURE_SYMLINKS |
 184                                     ARCHIVE_EXTRACT_SECURE_NODOTDOT;
 185                                 if (bsdar->options & AR_O)
 186                                         flags |= ARCHIVE_EXTRACT_TIME;
 187
 188                                 r = archive_read_extract(a, entry, flags);
 189                         }
 190
 191                         if (r) {
 192                                 bsdar_warnc(bsdar, archive_errno(a), "%s",
 193                                     archive_error_string(a));
 194                                 exitcode = EXIT_FAILURE;
 195                         }
 196                 }
 197         }
 198
 199         if (r == ARCHIVE_FATAL)
 200                 exitcode = EXIT_FAILURE;
 201
 202         AC(archive_read_close(a));
 203         AC(archive_read_free(a));
 204
 205         return (exitcode);
 206 }