1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992 Keith Muller. 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Keith Muller of the University of California, San Diego. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)pax.h 8.2 (Berkeley) 4/18/94 36 */ 37 38 /* 39 * BSD PAX global data structures and constants. 40 */ 41 42 #define MAXBLK 64512 /* MAX blocksize supported (posix SPEC) */ 43 /* WARNING: increasing MAXBLK past 32256 */ 44 /* will violate posix spec. */ 45 #define MAXBLK_POSIX 32256 /* MAX blocksize supported as per POSIX */ 46 #define BLKMULT 512 /* blocksize must be even mult of 512 bytes */ 47 /* Don't even think of changing this */ 48 #define DEVBLK 8192 /* default read blksize for devices */ 49 #define FILEBLK 10240 /* default read blksize for files */ 50 #define PAXPATHLEN 3072 /* maximum path length for pax. MUST be */ 51 /* longer than the system PATH_MAX */ 52 53 /* 54 * Pax modes of operation 55 */ 56 #define LIST 0 /* List the file in an archive */ 57 #define EXTRACT 1 /* extract the files in an archive */ 58 #define ARCHIVE 2 /* write a new archive */ 59 #define APPND 3 /* append to the end of an archive */ 60 #define COPY 4 /* copy files to destination dir */ 61 #define DEFOP LIST /* if no flags default is to LIST */ 62 63 /* 64 * Device type of the current archive volume 65 */ 66 #define ISREG 0 /* regular file */ 67 #define ISCHR 1 /* character device */ 68 #define ISBLK 2 /* block device */ 69 #define ISTAPE 3 /* tape drive */ 70 #define ISPIPE 4 /* pipe/socket */ 71 72 typedef struct archd ARCHD; 73 typedef struct fsub FSUB; 74 typedef struct oplist OPLIST; 75 typedef struct pattern PATTERN; 76 77 /* 78 * Format Specific Routine Table 79 * 80 * The format specific routine table allows new archive formats to be quickly 81 * added. Overall pax operation is independent of the actual format used to 82 * form the archive. Only those routines which deal directly with the archive 83 * are tailored to the oddities of the specific format. All other routines are 84 * independent of the archive format. Data flow in and out of the format 85 * dependent routines pass pointers to ARCHD structure (described below). 86 */ 87 struct fsub { 88 const char *name; /* name of format, this is the name the user */ 89 /* gives to -x option to select it. */ 90 int bsz; /* default block size. used when the user */ 91 /* does not specify a blocksize for writing */ 92 /* Appends continue to with the blocksize */ 93 /* the archive is currently using. */ 94 int hsz; /* Header size in bytes. this is the size of */ 95 /* the smallest header this format supports. */ 96 /* Headers are assumed to fit in a BLKMULT. */ 97 /* If they are bigger, get_head() and */ 98 /* get_arc() must be adjusted */ 99 int udev; /* does append require unique dev/ino? some */ 100 /* formats use the device and inode fields */ 101 /* to specify hard links. when members in */ 102 /* the archive have the same inode/dev they */ 103 /* are assumed to be hard links. During */ 104 /* append we may have to generate unique ids */ 105 /* to avoid creating incorrect hard links */ 106 int hlk; /* does archive store hard links info? if */ 107 /* not, we do not bother to look for them */ 108 /* during archive write operations */ 109 int blkalgn; /* writes must be aligned to blkalgn boundary */ 110 int inhead; /* is the trailer encoded in a valid header? */ 111 /* if not, trailers are assumed to be found */ 112 /* in invalid headers (i.e like tar) */ 113 int (*id)(char *, int); /* checks if a buffer is a valid header */ 114 /* returns 1 if it is, o.w. returns a 0 */ 115 int (*st_rd)(void); /* initialize routine for read. so format */ 116 /* can set up tables etc before it starts */ 117 /* reading an archive */ 118 int (*rd)(ARCHD *, char *); 119 /* read header routine. passed a pointer to */ 120 /* ARCHD. It must extract the info from the */ 121 /* format and store it in the ARCHD struct. */ 122 /* This routine is expected to fill all the */ 123 /* fields in the ARCHD (including stat buf) */ 124 /* 0 is returned when a valid header is */ 125 /* found. -1 when not valid. This routine */ 126 /* set the skip and pad fields so the format */ 127 /* independent routines know the amount of */ 128 /* padding and the number of bytes of data */ 129 /* which follow the header. This info is */ 130 /* used skip to the next file header */ 131 off_t (*end_rd)(void); /* read cleanup. Allows format to clean up */ 132 /* and MUST RETURN THE LENGTH OF THE TRAILER */ 133 /* RECORD (so append knows how many bytes */ 134 /* to move back to rewrite the trailer) */ 135 int (*st_wr)(void); /* initialize routine for write operations */ 136 int (*wr)(ARCHD *); /* write archive header. Passed an ARCHD */ 137 /* filled with the specs on the next file to */ 138 /* archived. Returns a 1 if no file data is */ 139 /* is to be stored; 0 if file data is to be */ 140 /* added. A -1 is returned if a write */ 141 /* operation to the archive failed. this */ 142 /* function sets the skip and pad fields so */ 143 /* the proper padding can be added after */ 144 /* file data. This routine must NEVER write */ 145 /* a flawed archive header. */ 146 int (*end_wr)(void); /* end write. write the trailer and do any */ 147 /* other format specific functions needed */ 148 /* at the end of an archive write */ 149 int (*trail_cpio)(ARCHD *); 150 int (*trail_tar)(char *, int, int *); 151 /* returns 0 if a valid trailer, -1 if not */ 152 /* For formats which encode the trailer */ 153 /* outside of a valid header, a return value */ 154 /* of 1 indicates that the block passed to */ 155 /* it can never contain a valid header (skip */ 156 /* this block, no point in looking at it) */ 157 int (*rd_data)(ARCHD *, int, off_t *); 158 /* read/process file data from the archive */ 159 int (*wr_data)(ARCHD *, int, off_t *); 160 /* write/process file data to the archive */ 161 int (*options)(void); /* process format specific options (-o) */ 162 }; 163 164 /* 165 * Pattern matching structure 166 * 167 * Used to store command line patterns 168 */ 169 struct pattern { 170 char *pstr; /* pattern to match, user supplied */ 171 char *pend; /* end of a prefix match */ 172 char *chdname; /* the dir to change to if not NULL. */ 173 int plen; /* length of pstr */ 174 int flgs; /* processing/state flags */ 175 #define MTCH 0x1 /* pattern has been matched */ 176 #define DIR_MTCH 0x2 /* pattern matched a directory */ 177 struct pattern *fow; /* next pattern */ 178 }; 179 180 /* 181 * General Archive Structure (used internal to pax) 182 * 183 * This structure is used to pass information about archive members between 184 * the format independent routines and the format specific routines. When 185 * new archive formats are added, they must accept requests and supply info 186 * encoded in a structure of this type. The name fields are declared statically 187 * here, as there is only ONE of these floating around, size is not a major 188 * consideration. Eventually converting the name fields to a dynamic length 189 * may be required if and when the supporting operating system removes all 190 * restrictions on the length of pathnames it will resolve. 191 */ 192 struct archd { 193 int nlen; /* file name length */ 194 char name[PAXPATHLEN+1]; /* file name */ 195 int ln_nlen; /* link name length */ 196 char ln_name[PAXPATHLEN+1]; /* name to link to (if any) */ 197 char *org_name; /* orig name in file system */ 198 PATTERN *pat; /* ptr to pattern match (if any) */ 199 struct stat sb; /* stat buffer see stat(2) */ 200 off_t pad; /* bytes of padding after file xfer */ 201 off_t skip; /* bytes of real data after header */ 202 /* IMPORTANT. The st_size field does */ 203 /* not always indicate the amount of */ 204 /* data following the header. */ 205 u_long crc; /* file crc */ 206 int type; /* type of file node */ 207 #define PAX_DIR 1 /* directory */ 208 #define PAX_CHR 2 /* character device */ 209 #define PAX_BLK 3 /* block device */ 210 #define PAX_REG 4 /* regular file */ 211 #define PAX_SLK 5 /* symbolic link */ 212 #define PAX_SCK 6 /* socket */ 213 #define PAX_FIF 7 /* fifo */ 214 #define PAX_HLK 8 /* hard link */ 215 #define PAX_HRG 9 /* hard link to a regular file */ 216 #define PAX_CTG 10 /* high performance file */ 217 }; 218 219 /* 220 * Format Specific Options List 221 * 222 * Used to pass format options to the format options handler 223 */ 224 struct oplist { 225 char *name; /* option variable name e.g. name= */ 226 char *value; /* value for option variable */ 227 struct oplist *fow; /* next option */ 228 }; 229 230 /* 231 * General Macros 232 */ 233 #ifndef MIN 234 #define MIN(a,b) (((a)<(b))?(a):(b)) 235 #endif 236 #define MAJOR(x) major(x) 237 #define MINOR(x) minor(x) 238 #define TODEV(x, y) makedev((x), (y)) 239 240 /* 241 * General Defines 242 */ 243 #define HEX 16 244 #define OCT 8 245 #define _PAX_ 1 246 #define _TFILE_BASE "paxXXXXXXXXXX" 247