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 } 222