contrib/elftoolchain/ar/read.c

   1 /*-
   2  * Copyright (c) 2007 Kai Wang
   3  * Copyright (c) 2007 Tim Kientzle
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer
  11  *    in this position and unchanged.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/queue.h>
  29 #include <sys/stat.h>
  30
  31 #include <archive.h>
  32 #include <archive_entry.h>
  33 #include <assert.h>
  34 #include <errno.h>
  35 #include <libgen.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #include "ar.h"
  41
  42 ELFTC_VCSID("$Id: read.c 3629 2018-09-30 19:26:28Z jkoshy $");
  43
  44 /*
  45  * Handle read modes: 'x', 't' and 'p'.
  46  *
  47  * Returns EXIT_SUCCESS if all operations completed successfully or returns
  48  * EXIT_FAILURE otherwise.
  49  */
  50 int
  51 ar_read_archive(struct bsdar *bsdar, int mode)
  52 {
  53         FILE                     *out;
  54         struct archive           *a;
  55         struct archive_entry     *entry;
  56         struct stat               sb;
  57         struct tm                *tp;
  58         const char               *bname;
  59         const char               *name;
  60         mode_t                    md;
  61         size_t                    size;
  62         time_t                    mtime;
  63         uid_t                     uid;
  64         gid_t                     gid;
  65         char                    **av;
  66         char                      buf[25];
  67         int                       found;
  68         int                       exitcode, i, flags, r;
  69
  70         assert(mode == 'p' || mode == 't' || mode == 'x');
  71
  72         if ((a = archive_read_new()) == NULL)
  73                 bsdar_errc(bsdar, 0, "archive_read_new failed");
  74         archive_read_support_format_ar(a);
  75         AC(archive_read_open_filename(a, bsdar->filename, DEF_BLKSZ));
  76
  77         exitcode = EXIT_SUCCESS;
  78         out = bsdar->output;
  79
  80         for (;;) {
  81                 r = archive_read_next_header(a, &entry);
  82                 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
  83                     r == ARCHIVE_FATAL)
  84                         bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
  85                 if (r == ARCHIVE_EOF || r == ARCHIVE_FATAL)
  86                         break;
  87                 if (r == ARCHIVE_RETRY) {
  88                         bsdar_warnc(bsdar, 0, "Retrying...");
  89                         continue;
  90                 }
  91
  92                 if (archive_format(a) == ARCHIVE_FORMAT_AR_BSD)
  93                         bsdar->options |= AR_BSD;
  94                 else
  95                         bsdar->options &= ~AR_BSD;
  96
  97                 if ((name = archive_entry_pathname(entry)) == NULL)
  98                         break;
  99
 100                 /* Skip pseudo members. */
 101                 if (bsdar_is_pseudomember(bsdar, name))
 102                         continue;
 103
 104                 /* The ar(5) format only supports 'leaf' file names. */
 105                 if (strchr(name, '/')) {
 106                         bsdar_warnc(bsdar, 0, "ignoring entry: %s",
 107                             name);
 108                         continue;
 109                 }
 110
 111                 /*
 112                  * If we had been given a list of file names to process, check
 113                  * that the current entry is present in this list.
 114                  */
 115                 if (bsdar->argc > 0) {
 116                         found = 0;
 117                         for(i = 0; i < bsdar->argc; i++) {
 118                                 av = &bsdar->argv[i];
 119                                 if (*av == NULL)
 120                                         continue;
 121                                 /*
 122                                  * Per POSIX, only the basename of a file
 123                                  * argument should be compared.
 124                                  */
 125                                 if ((bname = basename(*av)) == NULL)
 126                                         bsdar_errc(bsdar, errno,
 127                                             "basename failed");
 128                                 if (strcmp(bname, name) != 0)
 129                                         continue;
 130
 131                                 *av = NULL;
 132                                 found = 1;
 133                                 break;
 134                         }
 135                         if (!found)
 136                                 continue;
 137                 }
 138
 139                 if (mode == 't') {
 140                         if (bsdar->options & AR_V) {
 141                                 md = archive_entry_mode(entry);
 142                                 uid = archive_entry_uid(entry);
 143                                 gid = archive_entry_gid(entry);
 144                                 size = archive_entry_size(entry);
 145                                 mtime = archive_entry_mtime(entry);
 146                                 (void)fprintf(out, "%s %6d/%-6d %8ju ",
 147                                     bsdar_strmode(md) + 1, uid, gid,
 148                                     (uintmax_t)size);
 149                                 tp = localtime(&mtime);
 150                                 (void)strftime(buf, sizeof(buf),
 151                                     "%b %e %H:%M %Y", tp);
 152                                 (void)fprintf(out, "%s %s", buf, name);
 153                         } else
 154                                 (void)fprintf(out, "%s", name);
 155                         r = archive_read_data_skip(a);
 156                         if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
 157                             r == ARCHIVE_FATAL) {
 158                                 (void)fprintf(out, "\n");
 159                                 bsdar_warnc(bsdar, 0, "%s",
 160                                     archive_error_string(a));
 161                         }
 162
 163                         if (r == ARCHIVE_FATAL)
 164                                 break;
 165
 166                         (void)fprintf(out, "\n");
 167                 } else {
 168                         /* mode == 'x' || mode = 'p' */
 169                         if (mode == 'p') {
 170                                 if (bsdar->options & AR_V) {
 171                                         (void)fprintf(out, "\n<%s>\n\n",
 172                                             name);
 173                                         fflush(out);
 174                                 }
 175                                 r = archive_read_data_into_fd(a, fileno(out));
 176                         } else {
 177                                 /* mode == 'x' */
 178                                 if (stat(name, &sb) != 0) {
 179                                         if (errno != ENOENT) {
 180                                                 bsdar_warnc(bsdar, errno,
 181                                                     "stat %s failed",
 182                                                     bsdar->filename);
 183                                                 continue;
 184                                         }
 185                                 } else {
 186                                         /* stat success, file exist */
 187                                         if (bsdar->options & AR_CC)
 188                                                 continue;
 189                                         if (bsdar->options & AR_U &&
 190                                             archive_entry_mtime(entry) <=
 191                                             sb.st_mtime)
 192                                                 continue;
 193                                 }
 194
 195                                 if (bsdar->options & AR_V)
 196                                         (void)fprintf(out, "x - %s\n", name);
 197                                 /* Basic path security flags. */
 198                                 flags = ARCHIVE_EXTRACT_SECURE_SYMLINKS |
 199                                     ARCHIVE_EXTRACT_SECURE_NODOTDOT;
 200                                 if (bsdar->options & AR_O)
 201                                         flags |= ARCHIVE_EXTRACT_TIME;
 202
 203                                 r = archive_read_extract(a, entry, flags);
 204                         }
 205
 206                         if (r) {
 207                                 bsdar_warnc(bsdar, 0, "%s",
 208                                     archive_error_string(a));
 209                                 exitcode = EXIT_FAILURE;
 210                         }
 211                 }
 212         }
 213
 214         if (r == ARCHIVE_FATAL)
 215                 exitcode = EXIT_FAILURE;
 216
 217         AC(archive_read_close(a));
 218         ACV(archive_read_free(a));
 219
 220         return (exitcode);
 221 }