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