1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini tar implementation for busybox
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4 | *
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5 | * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg
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6 | * Glenn McGrath <bug1@iinet.net.au>
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7 | *
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8 | * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
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9 | * ground up. It still has remnants of the old code lying about, but it is
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10 | * very different now (i.e., cleaner, less global variables, etc.)
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11 | *
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12 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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13 | *
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14 | * Based in part in the tar implementation in sash
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15 | * Copyright (c) 1999 by David I. Bell
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16 | * Permission is granted to use, distribute, or modify this source,
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17 | * provided that this copyright notice remains intact.
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18 | * Permission to distribute sash derived code under the GPL has been granted.
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19 | *
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20 | * Based in part on the tar implementation from busybox-0.28
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21 | * Copyright (C) 1995 Bruce Perens
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22 | *
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23 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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24 | */
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25 |
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26 | #include <fnmatch.h>
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27 | #include <getopt.h>
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28 | #include "libbb.h"
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29 | #include "unarchive.h"
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30 |
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31 | #define block_buf bb_common_bufsiz1
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32 |
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33 | #if ENABLE_FEATURE_TAR_CREATE
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34 |
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35 | /* Tar file constants */
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36 |
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37 | #define TAR_BLOCK_SIZE 512
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38 |
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39 | /* POSIX tar Header Block, from POSIX 1003.1-1990 */
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40 | #define NAME_SIZE 100
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41 | #define NAME_SIZE_STR "100"
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42 | typedef struct TarHeader TarHeader;
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43 | struct TarHeader { /* byte offset */
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44 | char name[NAME_SIZE]; /* 0-99 */
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45 | char mode[8]; /* 100-107 */
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46 | char uid[8]; /* 108-115 */
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47 | char gid[8]; /* 116-123 */
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48 | char size[12]; /* 124-135 */
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49 | char mtime[12]; /* 136-147 */
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50 | char chksum[8]; /* 148-155 */
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51 | char typeflag; /* 156-156 */
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52 | char linkname[NAME_SIZE]; /* 157-256 */
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53 | char magic[6]; /* 257-262 */
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54 | char version[2]; /* 263-264 */
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55 | char uname[32]; /* 265-296 */
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56 | char gname[32]; /* 297-328 */
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57 | char devmajor[8]; /* 329-336 */
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58 | char devminor[8]; /* 337-344 */
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59 | char prefix[155]; /* 345-499 */
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60 | char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
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61 | };
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62 |
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63 | /*
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64 | ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
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65 | ** the only functions that deal with the HardLinkInfo structure.
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66 | ** Even these functions use the xxxHardLinkInfo() functions.
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67 | */
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68 | typedef struct HardLinkInfo HardLinkInfo;
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69 | struct HardLinkInfo {
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70 | HardLinkInfo *next; /* Next entry in list */
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71 | dev_t dev; /* Device number */
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72 | ino_t ino; /* Inode number */
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73 | short linkCount; /* (Hard) Link Count */
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74 | char name[1]; /* Start of filename (must be last) */
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75 | };
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76 |
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77 | /* Some info to be carried along when creating a new tarball */
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78 | typedef struct TarBallInfo TarBallInfo;
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79 | struct TarBallInfo {
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80 | int tarFd; /* Open-for-write file descriptor
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81 | for the tarball */
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82 | struct stat statBuf; /* Stat info for the tarball, letting
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83 | us know the inode and device that the
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84 | tarball lives, so we can avoid trying
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85 | to include the tarball into itself */
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86 | int verboseFlag; /* Whether to print extra stuff or not */
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87 | const llist_t *excludeList; /* List of files to not include */
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88 | HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
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89 | HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
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90 | };
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91 |
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92 | /* A nice enum with all the possible tar file content types */
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93 | enum TarFileType {
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94 | REGTYPE = '0', /* regular file */
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95 | REGTYPE0 = '\0', /* regular file (ancient bug compat) */
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96 | LNKTYPE = '1', /* hard link */
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97 | SYMTYPE = '2', /* symbolic link */
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98 | CHRTYPE = '3', /* character special */
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99 | BLKTYPE = '4', /* block special */
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100 | DIRTYPE = '5', /* directory */
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101 | FIFOTYPE = '6', /* FIFO special */
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102 | CONTTYPE = '7', /* reserved */
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103 | GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
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104 | GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
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105 | };
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106 | typedef enum TarFileType TarFileType;
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107 |
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108 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
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109 | static void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr,
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110 | struct stat *statbuf,
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111 | const char *fileName)
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112 | {
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113 | /* Note: hlInfoHeadPtr can never be NULL! */
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114 | HardLinkInfo *hlInfo;
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115 |
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116 | hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
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117 | hlInfo->next = *hlInfoHeadPtr;
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118 | *hlInfoHeadPtr = hlInfo;
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119 | hlInfo->dev = statbuf->st_dev;
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120 | hlInfo->ino = statbuf->st_ino;
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121 | hlInfo->linkCount = statbuf->st_nlink;
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122 | strcpy(hlInfo->name, fileName);
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123 | }
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124 |
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125 | static void freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr)
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126 | {
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127 | HardLinkInfo *hlInfo;
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128 | HardLinkInfo *hlInfoNext;
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129 |
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130 | if (hlInfoHeadPtr) {
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131 | hlInfo = *hlInfoHeadPtr;
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132 | while (hlInfo) {
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133 | hlInfoNext = hlInfo->next;
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134 | free(hlInfo);
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135 | hlInfo = hlInfoNext;
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136 | }
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137 | *hlInfoHeadPtr = NULL;
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138 | }
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139 | }
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140 |
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141 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
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142 | static HardLinkInfo *findHardLinkInfo(HardLinkInfo * hlInfo, struct stat *statbuf)
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143 | {
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144 | while (hlInfo) {
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145 | if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev))
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146 | break;
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147 | hlInfo = hlInfo->next;
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148 | }
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149 | return hlInfo;
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150 | }
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151 |
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152 | /* Put an octal string into the specified buffer.
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153 | * The number is zero padded and possibly null terminated.
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154 | * Stores low-order bits only if whole value does not fit. */
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155 | static void putOctal(char *cp, int len, off_t value)
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156 | {
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157 | char tempBuffer[sizeof(off_t)*3+1];
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158 | char *tempString = tempBuffer;
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159 | int width;
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160 |
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161 | width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
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162 | tempString += (width - len);
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163 |
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164 | /* If string has leading zeroes, we can drop one */
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165 | /* and field will have trailing '\0' */
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166 | /* (increases chances of compat with other tars) */
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167 | if (tempString[0] == '0')
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168 | tempString++;
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169 |
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170 | /* Copy the string to the field */
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171 | memcpy(cp, tempString, len);
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172 | }
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173 | #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
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174 |
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175 | static void chksum_and_xwrite(int fd, struct TarHeader* hp)
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176 | {
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177 | /* POSIX says that checksum is done on unsigned bytes
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178 | * (Sun and HP-UX gets it wrong... more details in
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179 | * GNU tar source) */
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180 | const unsigned char *cp;
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181 | int chksum, size;
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182 |
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183 | strcpy(hp->magic, "ustar ");
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184 |
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185 | /* Calculate and store the checksum (i.e., the sum of all of the bytes of
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186 | * the header). The checksum field must be filled with blanks for the
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187 | * calculation. The checksum field is formatted differently from the
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188 | * other fields: it has 6 digits, a null, then a space -- rather than
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189 | * digits, followed by a null like the other fields... */
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190 | memset(hp->chksum, ' ', sizeof(hp->chksum));
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191 | cp = (const unsigned char *) hp;
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192 | chksum = 0;
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193 | size = sizeof(*hp);
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194 | do { chksum += *cp++; } while (--size);
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195 | putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
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196 |
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197 | /* Now write the header out to disk */
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198 | xwrite(fd, hp, sizeof(*hp));
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199 | }
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200 |
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201 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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202 | static void writeLongname(int fd, int type, const char *name, int dir)
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203 | {
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204 | static const struct {
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205 | char mode[8]; /* 100-107 */
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206 | char uid[8]; /* 108-115 */
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207 | char gid[8]; /* 116-123 */
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208 | char size[12]; /* 124-135 */
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209 | char mtime[12]; /* 136-147 */
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210 | } prefilled = {
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211 | "0000000",
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212 | "0000000",
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213 | "0000000",
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214 | "00000000000",
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215 | "00000000000",
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216 | };
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217 | struct TarHeader header;
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218 | int size;
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219 |
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220 | dir = !!dir; /* normalize: 0/1 */
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221 | size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
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222 | /* + dir: account for possible '/' */
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223 |
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224 | memset(&header, 0, sizeof(header));
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225 | strcpy(header.name, "././@LongLink");
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226 | memcpy(header.mode, prefilled.mode, sizeof(prefilled));
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227 | PUT_OCTAL(header.size, size);
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228 | header.typeflag = type;
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229 | chksum_and_xwrite(fd, &header);
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230 |
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231 | /* Write filename[/] and pad the block. */
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232 | /* dir=0: writes 'name<NUL>', pads */
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233 | /* dir=1: writes 'name', writes '/<NUL>', pads */
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234 | dir *= 2;
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235 | xwrite(fd, name, size - dir);
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236 | xwrite(fd, "/", dir);
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237 | size = (-size) & (TAR_BLOCK_SIZE-1);
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238 | memset(&header, 0, size);
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239 | xwrite(fd, &header, size);
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240 | }
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241 | #endif
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242 |
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243 | /* Write out a tar header for the specified file/directory/whatever */
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244 | void BUG_tar_header_size(void);
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245 | static int writeTarHeader(struct TarBallInfo *tbInfo,
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246 | const char *header_name, const char *fileName, struct stat *statbuf)
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247 | {
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248 | struct TarHeader header;
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249 |
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250 | if (sizeof(header) != 512)
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251 | BUG_tar_header_size();
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252 |
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253 | memset(&header, 0, sizeof(struct TarHeader));
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254 |
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255 | strncpy(header.name, header_name, sizeof(header.name));
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256 |
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257 | /* POSIX says to mask mode with 07777. */
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258 | PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
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259 | PUT_OCTAL(header.uid, statbuf->st_uid);
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260 | PUT_OCTAL(header.gid, statbuf->st_gid);
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261 | memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
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262 | PUT_OCTAL(header.mtime, statbuf->st_mtime);
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263 |
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264 | /* Enter the user and group names */
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265 | safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
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266 | safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
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267 |
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268 | if (tbInfo->hlInfo) {
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269 | /* This is a hard link */
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270 | header.typeflag = LNKTYPE;
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271 | strncpy(header.linkname, tbInfo->hlInfo->name,
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272 | sizeof(header.linkname));
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273 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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274 | /* Write out long linkname if needed */
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275 | if (header.linkname[sizeof(header.linkname)-1])
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276 | writeLongname(tbInfo->tarFd, GNULONGLINK,
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277 | tbInfo->hlInfo->name, 0);
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278 | #endif
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279 | } else if (S_ISLNK(statbuf->st_mode)) {
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280 | char *lpath = xmalloc_readlink_or_warn(fileName);
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281 | if (!lpath)
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282 | return FALSE;
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283 | header.typeflag = SYMTYPE;
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284 | strncpy(header.linkname, lpath, sizeof(header.linkname));
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285 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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286 | /* Write out long linkname if needed */
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287 | if (header.linkname[sizeof(header.linkname)-1])
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288 | writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
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289 | #else
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290 | /* If it is larger than 100 bytes, bail out */
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291 | if (header.linkname[sizeof(header.linkname)-1]) {
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292 | free(lpath);
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293 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
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294 | return FALSE;
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295 | }
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296 | #endif
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297 | free(lpath);
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298 | } else if (S_ISDIR(statbuf->st_mode)) {
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299 | header.typeflag = DIRTYPE;
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300 | /* Append '/' only if there is a space for it */
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301 | if (!header.name[sizeof(header.name)-1])
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302 | header.name[strlen(header.name)] = '/';
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303 | } else if (S_ISCHR(statbuf->st_mode)) {
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304 | header.typeflag = CHRTYPE;
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305 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
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306 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
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307 | } else if (S_ISBLK(statbuf->st_mode)) {
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308 | header.typeflag = BLKTYPE;
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309 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
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310 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
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311 | } else if (S_ISFIFO(statbuf->st_mode)) {
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312 | header.typeflag = FIFOTYPE;
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313 | } else if (S_ISREG(statbuf->st_mode)) {
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314 | if (sizeof(statbuf->st_size) > 4
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315 | && statbuf->st_size > (off_t)0777777777777LL
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316 | ) {
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317 | bb_error_msg_and_die("cannot store file '%s' "
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318 | "of size %"OFF_FMT"d, aborting",
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319 | fileName, statbuf->st_size);
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320 | }
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321 | header.typeflag = REGTYPE;
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322 | PUT_OCTAL(header.size, statbuf->st_size);
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323 | } else {
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324 | bb_error_msg("%s: unknown file type", fileName);
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325 | return FALSE;
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326 | }
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327 |
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328 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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329 | /* Write out long name if needed */
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330 | /* (we, like GNU tar, output long linkname *before* long name) */
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331 | if (header.name[sizeof(header.name)-1])
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332 | writeLongname(tbInfo->tarFd, GNULONGNAME,
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333 | header_name, S_ISDIR(statbuf->st_mode));
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334 | #endif
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335 |
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336 | /* Now write the header out to disk */
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337 | chksum_and_xwrite(tbInfo->tarFd, &header);
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338 |
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339 | /* Now do the verbose thing (or not) */
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340 | if (tbInfo->verboseFlag) {
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341 | FILE *vbFd = stdout;
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342 |
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343 | if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */
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344 | vbFd = stderr;
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345 | /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
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346 | /* We don't have such excesses here: for us "v" == "vv" */
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347 | /* '/' is probably a GNUism */
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348 | fprintf(vbFd, "%s%s\n", header_name,
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349 | S_ISDIR(statbuf->st_mode) ? "/" : "");
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350 | }
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351 |
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352 | return TRUE;
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353 | }
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354 |
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355 | #if ENABLE_FEATURE_TAR_FROM
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356 | static int exclude_file(const llist_t *excluded_files, const char *file)
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357 | {
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358 | while (excluded_files) {
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359 | if (excluded_files->data[0] == '/') {
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360 | if (fnmatch(excluded_files->data, file,
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361 | FNM_PATHNAME | FNM_LEADING_DIR) == 0)
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362 | return 1;
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363 | } else {
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364 | const char *p;
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365 |
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366 | for (p = file; p[0] != '\0'; p++) {
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367 | if ((p == file || p[-1] == '/') && p[0] != '/' &&
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368 | fnmatch(excluded_files->data, p,
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369 | FNM_PATHNAME | FNM_LEADING_DIR) == 0)
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370 | return 1;
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371 | }
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372 | }
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373 | excluded_files = excluded_files->link;
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374 | }
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375 |
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376 | return 0;
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377 | }
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378 | #else
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379 | #define exclude_file(excluded_files, file) 0
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380 | #endif
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381 |
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382 | static int writeFileToTarball(const char *fileName, struct stat *statbuf,
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383 | void *userData, int depth ATTRIBUTE_UNUSED)
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384 | {
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385 | struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
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386 | const char *header_name;
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387 | int inputFileFd = -1;
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388 |
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389 | /*
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390 | * Check to see if we are dealing with a hard link.
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391 | * If so -
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392 | * Treat the first occurance of a given dev/inode as a file while
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393 | * treating any additional occurances as hard links. This is done
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394 | * by adding the file information to the HardLinkInfo linked list.
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395 | */
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396 | tbInfo->hlInfo = NULL;
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397 | if (statbuf->st_nlink > 1) {
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398 | tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
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399 | if (tbInfo->hlInfo == NULL)
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400 | addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, fileName);
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401 | }
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402 |
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403 | /* It is against the rules to archive a socket */
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404 | if (S_ISSOCK(statbuf->st_mode)) {
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405 | bb_error_msg("%s: socket ignored", fileName);
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406 | return TRUE;
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407 | }
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408 |
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409 | /* It is a bad idea to store the archive we are in the process of creating,
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410 | * so check the device and inode to be sure that this particular file isn't
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411 | * the new tarball */
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412 | if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
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413 | tbInfo->statBuf.st_ino == statbuf->st_ino) {
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414 | bb_error_msg("%s: file is the archive; skipping", fileName);
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415 | return TRUE;
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416 | }
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417 |
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418 | header_name = fileName;
|
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419 | while (header_name[0] == '/') {
|
---|
420 | static smallint warned;
|
---|
421 |
|
---|
422 | if (!warned) {
|
---|
423 | bb_error_msg("removing leading '/' from member names");
|
---|
424 | warned = 1;
|
---|
425 | }
|
---|
426 | header_name++;
|
---|
427 | }
|
---|
428 |
|
---|
429 | #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
|
---|
430 | if (strlen(fileName) >= NAME_SIZE) {
|
---|
431 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
|
---|
432 | return TRUE;
|
---|
433 | }
|
---|
434 | #endif
|
---|
435 |
|
---|
436 | if (header_name[0] == '\0')
|
---|
437 | return TRUE;
|
---|
438 |
|
---|
439 | if (exclude_file(tbInfo->excludeList, header_name))
|
---|
440 | return SKIP;
|
---|
441 |
|
---|
442 | /* Is this a regular file? */
|
---|
443 | if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
|
---|
444 | /* open the file we want to archive, and make sure all is well */
|
---|
445 | inputFileFd = open_or_warn(fileName, O_RDONLY);
|
---|
446 | if (inputFileFd < 0) {
|
---|
447 | return FALSE;
|
---|
448 | }
|
---|
449 | }
|
---|
450 |
|
---|
451 | /* Add an entry to the tarball */
|
---|
452 | if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
|
---|
453 | return FALSE;
|
---|
454 | }
|
---|
455 |
|
---|
456 | /* If it was a regular file, write out the body */
|
---|
457 | if (inputFileFd >= 0) {
|
---|
458 | size_t readSize;
|
---|
459 | /* Write the file to the archive. */
|
---|
460 | /* We record size into header first, */
|
---|
461 | /* and then write out file. If file shrinks in between, */
|
---|
462 | /* tar will be corrupted. So we don't allow for that. */
|
---|
463 | /* NB: GNU tar 1.16 warns and pads with zeroes */
|
---|
464 | /* or even seeks back and updates header */
|
---|
465 | bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
|
---|
466 | ////off_t readSize;
|
---|
467 | ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
|
---|
468 | ////if (readSize != statbuf->st_size && readSize >= 0) {
|
---|
469 | //// bb_error_msg_and_die("short read from %s, aborting", fileName);
|
---|
470 | ////}
|
---|
471 |
|
---|
472 | /* Check that file did not grow in between? */
|
---|
473 | /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
|
---|
474 |
|
---|
475 | close(inputFileFd);
|
---|
476 |
|
---|
477 | /* Pad the file up to the tar block size */
|
---|
478 | /* (a few tricks here in the name of code size) */
|
---|
479 | readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
|
---|
480 | memset(block_buf, 0, readSize);
|
---|
481 | xwrite(tbInfo->tarFd, block_buf, readSize);
|
---|
482 | }
|
---|
483 |
|
---|
484 | return TRUE;
|
---|
485 | }
|
---|
486 |
|
---|
487 | static int writeTarFile(const int tar_fd, const int verboseFlag,
|
---|
488 | const unsigned long dereferenceFlag, const llist_t *include,
|
---|
489 | const llist_t *exclude, const int gzip)
|
---|
490 | {
|
---|
491 | pid_t gzipPid = 0;
|
---|
492 | int errorFlag = FALSE;
|
---|
493 | struct TarBallInfo tbInfo;
|
---|
494 |
|
---|
495 | tbInfo.hlInfoHead = NULL;
|
---|
496 |
|
---|
497 | fchmod(tar_fd, 0644);
|
---|
498 | tbInfo.tarFd = tar_fd;
|
---|
499 | tbInfo.verboseFlag = verboseFlag;
|
---|
500 |
|
---|
501 | /* Store the stat info for the tarball's file, so
|
---|
502 | * can avoid including the tarball into itself.... */
|
---|
503 | if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
|
---|
504 | bb_perror_msg_and_die("cannot stat tar file");
|
---|
505 |
|
---|
506 | if ((ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2) && gzip) {
|
---|
507 | int gzipDataPipe[2] = { -1, -1 };
|
---|
508 | int gzipStatusPipe[2] = { -1, -1 };
|
---|
509 | volatile int vfork_exec_errno = 0;
|
---|
510 | const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
|
---|
511 |
|
---|
512 | xpipe(gzipDataPipe);
|
---|
513 | xpipe(gzipStatusPipe);
|
---|
514 |
|
---|
515 | signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
|
---|
516 |
|
---|
517 | #if defined(__GNUC__) && __GNUC__
|
---|
518 | /* Avoid vfork clobbering */
|
---|
519 | (void) &include;
|
---|
520 | (void) &errorFlag;
|
---|
521 | (void) &zip_exec;
|
---|
522 | #endif
|
---|
523 |
|
---|
524 | gzipPid = vfork();
|
---|
525 |
|
---|
526 | if (gzipPid == 0) {
|
---|
527 | dup2(gzipDataPipe[0], 0);
|
---|
528 | close(gzipDataPipe[1]);
|
---|
529 |
|
---|
530 | dup2(tbInfo.tarFd, 1);
|
---|
531 |
|
---|
532 | close(gzipStatusPipe[0]);
|
---|
533 | fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC); /* close on exec shows success */
|
---|
534 |
|
---|
535 | BB_EXECLP(zip_exec, zip_exec, "-f", NULL);
|
---|
536 | vfork_exec_errno = errno;
|
---|
537 |
|
---|
538 | close(gzipStatusPipe[1]);
|
---|
539 | exit(-1);
|
---|
540 | } else if (gzipPid > 0) {
|
---|
541 | close(gzipDataPipe[0]);
|
---|
542 | close(gzipStatusPipe[1]);
|
---|
543 |
|
---|
544 | while (1) {
|
---|
545 | char buf;
|
---|
546 |
|
---|
547 | int n = full_read(gzipStatusPipe[0], &buf, 1);
|
---|
548 |
|
---|
549 | if (n == 0 && vfork_exec_errno != 0) {
|
---|
550 | errno = vfork_exec_errno;
|
---|
551 | bb_perror_msg_and_die("cannot exec %s", zip_exec);
|
---|
552 | } else if ((n < 0) && (errno == EAGAIN || errno == EINTR))
|
---|
553 | continue; /* try it again */
|
---|
554 | break;
|
---|
555 | }
|
---|
556 | close(gzipStatusPipe[0]);
|
---|
557 |
|
---|
558 | tbInfo.tarFd = gzipDataPipe[1];
|
---|
559 | } else bb_perror_msg_and_die("vfork gzip");
|
---|
560 | }
|
---|
561 |
|
---|
562 | tbInfo.excludeList = exclude;
|
---|
563 |
|
---|
564 | /* Read the directory/files and iterate over them one at a time */
|
---|
565 | while (include) {
|
---|
566 | if (!recursive_action(include->data, ACTION_RECURSE |
|
---|
567 | (dereferenceFlag ? ACTION_FOLLOWLINKS : 0),
|
---|
568 | writeFileToTarball, writeFileToTarball, &tbInfo, 0))
|
---|
569 | {
|
---|
570 | errorFlag = TRUE;
|
---|
571 | }
|
---|
572 | include = include->link;
|
---|
573 | }
|
---|
574 | /* Write two empty blocks to the end of the archive */
|
---|
575 | memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
|
---|
576 | xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
|
---|
577 |
|
---|
578 | /* To be pedantically correct, we would check if the tarball
|
---|
579 | * is smaller than 20 tar blocks, and pad it if it was smaller,
|
---|
580 | * but that isn't necessary for GNU tar interoperability, and
|
---|
581 | * so is considered a waste of space */
|
---|
582 |
|
---|
583 | /* Close so the child process (if any) will exit */
|
---|
584 | close(tbInfo.tarFd);
|
---|
585 |
|
---|
586 | /* Hang up the tools, close up shop, head home */
|
---|
587 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
588 | freeHardLinkInfo(&tbInfo.hlInfoHead);
|
---|
589 |
|
---|
590 | if (errorFlag)
|
---|
591 | bb_error_msg("error exit delayed from previous errors");
|
---|
592 |
|
---|
593 | if (gzipPid) {
|
---|
594 | int status;
|
---|
595 | if (waitpid(gzipPid, &status, 0) == -1)
|
---|
596 | bb_perror_msg("waitpid");
|
---|
597 | else if (!WIFEXITED(status) || WEXITSTATUS(status))
|
---|
598 | /* gzip was killed or has exited with nonzero! */
|
---|
599 | errorFlag = TRUE;
|
---|
600 | }
|
---|
601 | return errorFlag;
|
---|
602 | }
|
---|
603 | #else
|
---|
604 | int writeTarFile(const int tar_fd, const int verboseFlag,
|
---|
605 | const unsigned long dereferenceFlag, const llist_t *include,
|
---|
606 | const llist_t *exclude, const int gzip);
|
---|
607 | #endif /* FEATURE_TAR_CREATE */
|
---|
608 |
|
---|
609 | #if ENABLE_FEATURE_TAR_FROM
|
---|
610 | static llist_t *append_file_list_to_list(llist_t *list)
|
---|
611 | {
|
---|
612 | FILE *src_stream;
|
---|
613 | llist_t *cur = list;
|
---|
614 | llist_t *tmp;
|
---|
615 | char *line;
|
---|
616 | llist_t *newlist = NULL;
|
---|
617 |
|
---|
618 | while (cur) {
|
---|
619 | src_stream = xfopen(cur->data, "r");
|
---|
620 | tmp = cur;
|
---|
621 | cur = cur->link;
|
---|
622 | free(tmp);
|
---|
623 | while ((line = xmalloc_getline(src_stream)) != NULL) {
|
---|
624 | /* kill trailing '/' unless the string is just "/" */
|
---|
625 | char *cp = last_char_is(line, '/');
|
---|
626 | if (cp > line)
|
---|
627 | *cp = '\0';
|
---|
628 | llist_add_to(&newlist, line);
|
---|
629 | }
|
---|
630 | fclose(src_stream);
|
---|
631 | }
|
---|
632 | return newlist;
|
---|
633 | }
|
---|
634 | #else
|
---|
635 | #define append_file_list_to_list(x) 0
|
---|
636 | #endif
|
---|
637 |
|
---|
638 | #if ENABLE_FEATURE_TAR_COMPRESS
|
---|
639 | static char get_header_tar_Z(archive_handle_t *archive_handle)
|
---|
640 | {
|
---|
641 | /* Can't lseek over pipes */
|
---|
642 | archive_handle->seek = seek_by_read;
|
---|
643 |
|
---|
644 | /* do the decompression, and cleanup */
|
---|
645 | if (xread_char(archive_handle->src_fd) != 0x1f
|
---|
646 | || xread_char(archive_handle->src_fd) != 0x9d
|
---|
647 | ) {
|
---|
648 | bb_error_msg_and_die("invalid magic");
|
---|
649 | }
|
---|
650 |
|
---|
651 | archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress, "uncompress", "uncompress", "-cf", "-", NULL);
|
---|
652 | archive_handle->offset = 0;
|
---|
653 | while (get_header_tar(archive_handle) == EXIT_SUCCESS)
|
---|
654 | /* nothing */;
|
---|
655 |
|
---|
656 | /* Can only do one file at a time */
|
---|
657 | return EXIT_FAILURE;
|
---|
658 | }
|
---|
659 | #else
|
---|
660 | #define get_header_tar_Z NULL
|
---|
661 | #endif
|
---|
662 |
|
---|
663 | #ifdef CHECK_FOR_CHILD_EXITCODE
|
---|
664 | /* Looks like it isn't needed - tar detects malformed (truncated)
|
---|
665 | * archive if e.g. bunzip2 fails */
|
---|
666 | static int child_error;
|
---|
667 |
|
---|
668 | static void handle_SIGCHLD(int status)
|
---|
669 | {
|
---|
670 | /* Actually, 'status' is a signo. We reuse it for other needs */
|
---|
671 |
|
---|
672 | /* Wait for any child without blocking */
|
---|
673 | if (waitpid(-1, &status, WNOHANG) < 0)
|
---|
674 | /* wait failed?! I'm confused... */
|
---|
675 | return;
|
---|
676 |
|
---|
677 | if (WIFEXITED(status) && WEXITSTATUS(status)==0)
|
---|
678 | /* child exited with 0 */
|
---|
679 | return;
|
---|
680 | /* Cannot happen?
|
---|
681 | if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */
|
---|
682 | child_error = 1;
|
---|
683 | }
|
---|
684 | #endif
|
---|
685 |
|
---|
686 | enum {
|
---|
687 | OPTBIT_KEEP_OLD = 7,
|
---|
688 | USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
|
---|
689 | USE_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
|
---|
690 | USE_FEATURE_TAR_BZIP2( OPTBIT_BZIP2 ,)
|
---|
691 | USE_FEATURE_TAR_LZMA( OPTBIT_LZMA ,)
|
---|
692 | USE_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
|
---|
693 | USE_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
|
---|
694 | USE_FEATURE_TAR_GZIP( OPTBIT_GZIP ,)
|
---|
695 | USE_FEATURE_TAR_COMPRESS(OPTBIT_COMPRESS ,)
|
---|
696 | OPTBIT_NOPRESERVE_OWN,
|
---|
697 | OPTBIT_NOPRESERVE_PERM,
|
---|
698 | OPT_TEST = 1 << 0, // t
|
---|
699 | OPT_EXTRACT = 1 << 1, // x
|
---|
700 | OPT_BASEDIR = 1 << 2, // C
|
---|
701 | OPT_TARNAME = 1 << 3, // f
|
---|
702 | OPT_2STDOUT = 1 << 4, // O
|
---|
703 | OPT_P = 1 << 5, // p
|
---|
704 | OPT_VERBOSE = 1 << 6, // v
|
---|
705 | OPT_KEEP_OLD = 1 << 7, // k
|
---|
706 | OPT_CREATE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_CREATE )) + 0, // c
|
---|
707 | OPT_DEREFERENCE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_DEREFERENCE )) + 0, // h
|
---|
708 | OPT_BZIP2 = USE_FEATURE_TAR_BZIP2( (1<<OPTBIT_BZIP2 )) + 0, // j
|
---|
709 | OPT_LZMA = USE_FEATURE_TAR_LZMA( (1<<OPTBIT_LZMA )) + 0, // a
|
---|
710 | OPT_INCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_INCLUDE_FROM)) + 0, // T
|
---|
711 | OPT_EXCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_EXCLUDE_FROM)) + 0, // X
|
---|
712 | OPT_GZIP = USE_FEATURE_TAR_GZIP( (1<<OPTBIT_GZIP )) + 0, // z
|
---|
713 | OPT_COMPRESS = USE_FEATURE_TAR_COMPRESS((1<<OPTBIT_COMPRESS )) + 0, // Z
|
---|
714 | OPT_NOPRESERVE_OWN = 1 << OPTBIT_NOPRESERVE_OWN , // no-same-owner
|
---|
715 | OPT_NOPRESERVE_PERM = 1 << OPTBIT_NOPRESERVE_PERM, // no-same-permissions
|
---|
716 | };
|
---|
717 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
---|
718 | static const char tar_longopts[] ALIGN1 =
|
---|
719 | "list\0" No_argument "t"
|
---|
720 | "extract\0" No_argument "x"
|
---|
721 | "directory\0" Required_argument "C"
|
---|
722 | "file\0" Required_argument "f"
|
---|
723 | "to-stdout\0" No_argument "O"
|
---|
724 | "same-permissions\0" No_argument "p"
|
---|
725 | "verbose\0" No_argument "v"
|
---|
726 | "keep-old\0" No_argument "k"
|
---|
727 | # if ENABLE_FEATURE_TAR_CREATE
|
---|
728 | "create\0" No_argument "c"
|
---|
729 | "dereference\0" No_argument "h"
|
---|
730 | # endif
|
---|
731 | # if ENABLE_FEATURE_TAR_BZIP2
|
---|
732 | "bzip2\0" No_argument "j"
|
---|
733 | # endif
|
---|
734 | # if ENABLE_FEATURE_TAR_LZMA
|
---|
735 | "lzma\0" No_argument "a"
|
---|
736 | # endif
|
---|
737 | # if ENABLE_FEATURE_TAR_FROM
|
---|
738 | "files-from\0" Required_argument "T"
|
---|
739 | "exclude-from\0" Required_argument "X"
|
---|
740 | # endif
|
---|
741 | # if ENABLE_FEATURE_TAR_GZIP
|
---|
742 | "gzip\0" No_argument "z"
|
---|
743 | # endif
|
---|
744 | # if ENABLE_FEATURE_TAR_COMPRESS
|
---|
745 | "compress\0" No_argument "Z"
|
---|
746 | # endif
|
---|
747 | "no-same-owner\0" No_argument "\xfd"
|
---|
748 | "no-same-permissions\0" No_argument "\xfe"
|
---|
749 | /* --exclude takes next bit position in option mask, */
|
---|
750 | /* therefore we have to either put it _after_ --no-same-perm */
|
---|
751 | /* or add OPT[BIT]_EXCLUDE before OPT[BIT]_NOPRESERVE_OWN */
|
---|
752 | # if ENABLE_FEATURE_TAR_FROM
|
---|
753 | "exclude\0" Required_argument "\xff"
|
---|
754 | # endif
|
---|
755 | ;
|
---|
756 | #endif
|
---|
757 |
|
---|
758 | int tar_main(int argc, char **argv);
|
---|
759 | int tar_main(int argc, char **argv)
|
---|
760 | {
|
---|
761 | char (*get_header_ptr)(archive_handle_t *) = get_header_tar;
|
---|
762 | archive_handle_t *tar_handle;
|
---|
763 | char *base_dir = NULL;
|
---|
764 | const char *tar_filename = "-";
|
---|
765 | unsigned opt;
|
---|
766 | int verboseFlag = 0;
|
---|
767 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
|
---|
768 | llist_t *excludes = NULL;
|
---|
769 | #endif
|
---|
770 |
|
---|
771 | /* Initialise default values */
|
---|
772 | tar_handle = init_handle();
|
---|
773 | tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS
|
---|
774 | | ARCHIVE_PRESERVE_DATE
|
---|
775 | | ARCHIVE_EXTRACT_UNCONDITIONAL;
|
---|
776 |
|
---|
777 | /* Prepend '-' to the first argument if required */
|
---|
778 | opt_complementary = "--:" // first arg is options
|
---|
779 | "tt:vv:" // count -t,-v
|
---|
780 | "?:" // bail out with usage instead of error return
|
---|
781 | "X::T::" // cumulative lists
|
---|
782 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
|
---|
783 | "\xff::" // cumulative lists for --exclude
|
---|
784 | #endif
|
---|
785 | USE_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
|
---|
786 | USE_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
|
---|
787 | SKIP_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive
|
---|
788 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
---|
789 | applet_long_options = tar_longopts;
|
---|
790 | #endif
|
---|
791 | opt = getopt32(argv,
|
---|
792 | "txC:f:Opvk"
|
---|
793 | USE_FEATURE_TAR_CREATE( "ch" )
|
---|
794 | USE_FEATURE_TAR_BZIP2( "j" )
|
---|
795 | USE_FEATURE_TAR_LZMA( "a" )
|
---|
796 | USE_FEATURE_TAR_FROM( "T:X:")
|
---|
797 | USE_FEATURE_TAR_GZIP( "z" )
|
---|
798 | USE_FEATURE_TAR_COMPRESS("Z" )
|
---|
799 | , &base_dir // -C dir
|
---|
800 | , &tar_filename // -f filename
|
---|
801 | USE_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
|
---|
802 | USE_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
|
---|
803 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
|
---|
804 | , &excludes // --exclude
|
---|
805 | #endif
|
---|
806 | , &verboseFlag // combined count for -t and -v
|
---|
807 | , &verboseFlag // combined count for -t and -v
|
---|
808 | );
|
---|
809 |
|
---|
810 | if (verboseFlag) tar_handle->action_header = header_verbose_list;
|
---|
811 | if (verboseFlag == 1) tar_handle->action_header = header_list;
|
---|
812 |
|
---|
813 | if (opt & OPT_EXTRACT)
|
---|
814 | tar_handle->action_data = data_extract_all;
|
---|
815 |
|
---|
816 | if (opt & OPT_2STDOUT)
|
---|
817 | tar_handle->action_data = data_extract_to_stdout;
|
---|
818 |
|
---|
819 | if (opt & OPT_KEEP_OLD)
|
---|
820 | tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL;
|
---|
821 |
|
---|
822 | if (opt & OPT_NOPRESERVE_OWN)
|
---|
823 | tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN;
|
---|
824 |
|
---|
825 | if (opt & OPT_NOPRESERVE_PERM)
|
---|
826 | tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM;
|
---|
827 |
|
---|
828 | if (opt & OPT_GZIP)
|
---|
829 | get_header_ptr = get_header_tar_gz;
|
---|
830 |
|
---|
831 | if (opt & OPT_BZIP2)
|
---|
832 | get_header_ptr = get_header_tar_bz2;
|
---|
833 |
|
---|
834 | if (opt & OPT_LZMA)
|
---|
835 | get_header_ptr = get_header_tar_lzma;
|
---|
836 |
|
---|
837 | if (opt & OPT_COMPRESS)
|
---|
838 | get_header_ptr = get_header_tar_Z;
|
---|
839 |
|
---|
840 | #if ENABLE_FEATURE_TAR_FROM
|
---|
841 | tar_handle->reject = append_file_list_to_list(tar_handle->reject);
|
---|
842 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
---|
843 | /* Append excludes to reject */
|
---|
844 | while (excludes) {
|
---|
845 | llist_t *next = excludes->link;
|
---|
846 | excludes->link = tar_handle->reject;
|
---|
847 | tar_handle->reject = excludes;
|
---|
848 | excludes = next;
|
---|
849 | }
|
---|
850 | #endif
|
---|
851 | tar_handle->accept = append_file_list_to_list(tar_handle->accept);
|
---|
852 | #endif
|
---|
853 |
|
---|
854 | /* Check if we are reading from stdin */
|
---|
855 | if (argv[optind] && *argv[optind] == '-') {
|
---|
856 | /* Default is to read from stdin, so just skip to next arg */
|
---|
857 | optind++;
|
---|
858 | }
|
---|
859 |
|
---|
860 | /* Setup an array of filenames to work with */
|
---|
861 | /* TODO: This is the same as in ar, separate function ? */
|
---|
862 | while (optind < argc) {
|
---|
863 | /* kill trailing '/' unless the string is just "/" */
|
---|
864 | char *cp = last_char_is(argv[optind], '/');
|
---|
865 | if (cp > argv[optind])
|
---|
866 | *cp = '\0';
|
---|
867 | llist_add_to_end(&tar_handle->accept, argv[optind]);
|
---|
868 | optind++;
|
---|
869 | }
|
---|
870 |
|
---|
871 | if (tar_handle->accept || tar_handle->reject)
|
---|
872 | tar_handle->filter = filter_accept_reject_list;
|
---|
873 |
|
---|
874 | /* Open the tar file */
|
---|
875 | {
|
---|
876 | FILE *tar_stream;
|
---|
877 | int flags;
|
---|
878 |
|
---|
879 | if (opt & OPT_CREATE) {
|
---|
880 | /* Make sure there is at least one file to tar up. */
|
---|
881 | if (tar_handle->accept == NULL)
|
---|
882 | bb_error_msg_and_die("empty archive");
|
---|
883 |
|
---|
884 | tar_stream = stdout;
|
---|
885 | /* Mimicking GNU tar 1.15.1: */
|
---|
886 | flags = O_WRONLY|O_CREAT|O_TRUNC;
|
---|
887 | /* was doing unlink; open(O_WRONLY|O_CREAT|O_EXCL); why? */
|
---|
888 | } else {
|
---|
889 | tar_stream = stdin;
|
---|
890 | flags = O_RDONLY;
|
---|
891 | }
|
---|
892 |
|
---|
893 | if (LONE_DASH(tar_filename)) {
|
---|
894 | tar_handle->src_fd = fileno(tar_stream);
|
---|
895 | tar_handle->seek = seek_by_read;
|
---|
896 | } else {
|
---|
897 | tar_handle->src_fd = xopen(tar_filename, flags);
|
---|
898 | }
|
---|
899 | }
|
---|
900 |
|
---|
901 | if (base_dir)
|
---|
902 | xchdir(base_dir);
|
---|
903 |
|
---|
904 | #ifdef CHECK_FOR_CHILD_EXITCODE
|
---|
905 | /* We need to know whether child (gzip/bzip/etc) exits abnormally */
|
---|
906 | signal(SIGCHLD, handle_SIGCHLD);
|
---|
907 | #endif
|
---|
908 |
|
---|
909 | /* create an archive */
|
---|
910 | if (opt & OPT_CREATE) {
|
---|
911 | int zipMode = 0;
|
---|
912 | if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz)
|
---|
913 | zipMode = 1;
|
---|
914 | if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2)
|
---|
915 | zipMode = 2;
|
---|
916 | /* NB: writeTarFile() closes tar_handle->src_fd */
|
---|
917 | return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
|
---|
918 | tar_handle->accept,
|
---|
919 | tar_handle->reject, zipMode);
|
---|
920 | }
|
---|
921 |
|
---|
922 | while (get_header_ptr(tar_handle) == EXIT_SUCCESS)
|
---|
923 | /* nothing */;
|
---|
924 |
|
---|
925 | /* Check that every file that should have been extracted was */
|
---|
926 | while (tar_handle->accept) {
|
---|
927 | if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
|
---|
928 | && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
|
---|
929 | ) {
|
---|
930 | bb_error_msg_and_die("%s: not found in archive",
|
---|
931 | tar_handle->accept->data);
|
---|
932 | }
|
---|
933 | tar_handle->accept = tar_handle->accept->link;
|
---|
934 | }
|
---|
935 | if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
|
---|
936 | close(tar_handle->src_fd);
|
---|
937 |
|
---|
938 | return EXIT_SUCCESS;
|
---|
939 | }
|
---|