diff options
Diffstat (limited to 'bin/pax/cpio.c')
| -rw-r--r-- | bin/pax/cpio.c | 1106 |
1 files changed, 1106 insertions, 0 deletions
diff --git a/bin/pax/cpio.c b/bin/pax/cpio.c new file mode 100644 index 0000000..769a9df --- /dev/null +++ b/bin/pax/cpio.c @@ -0,0 +1,1106 @@ +/* $OpenBSD: cpio.c,v 1.33 2017/09/16 07:42:34 otto Exp $ */ +/* $NetBSD: cpio.c,v 1.5 1995/03/21 09:07:13 cgd Exp $ */ + +/*- + * Copyright (c) 1992 Keith Muller. + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Keith Muller of the University of California, San Diego. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <limits.h> +#include <string.h> +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#ifndef major +#include <sys/sysmacros.h> +#endif + +#include "pax.h" +#include "cpio.h" +#include "extern.h" + +static int rd_nm(ARCHD *, int); +static int rd_ln_nm(ARCHD *); +static int com_rd(ARCHD *); + +/* + * Routines which support the different cpio versions + */ + +static int swp_head; /* binary cpio header byte swap */ + +/* + * Routines common to all versions of cpio + */ + +/* + * cpio_strd() + * Fire up the hard link detection code + * Return: + * 0 if ok -1 otherwise (the return values of lnk_start()) + */ + +int +cpio_strd(void) +{ + return(lnk_start()); +} + +/* + * cpio_trail() + * Called to determine if a header block is a valid trailer. We are + * passed the block, the in_sync flag (which tells us we are in resync + * mode; looking for a valid header), and cnt (which starts at zero) + * which is used to count the number of empty blocks we have seen so far. + * Return: + * 0 if a valid trailer, -1 if not a valid trailer, + */ + +int +cpio_trail(ARCHD *arcn, char *notused, int notused2, int *notused3) +{ + /* + * look for trailer id in file we are about to process + */ + if ((strcmp(arcn->name, TRAILER) == 0) && (arcn->sb.st_size == 0)) + return(0); + return(-1); +} + +/* + * com_rd() + * operations common to all cpio read functions. + * Return: + * 0 + */ + +static int +com_rd(ARCHD *arcn) +{ + arcn->skip = 0; + arcn->pat = NULL; + arcn->org_name = arcn->name; + switch (arcn->sb.st_mode & C_IFMT) { + case C_ISFIFO: + arcn->type = PAX_FIF; + break; + case C_ISDIR: + arcn->type = PAX_DIR; + break; + case C_ISBLK: + arcn->type = PAX_BLK; + break; + case C_ISCHR: + arcn->type = PAX_CHR; + break; + case C_ISLNK: + arcn->type = PAX_SLK; + break; + case C_ISOCK: + arcn->type = PAX_SCK; + break; + case C_ISCTG: + case C_ISREG: + default: + /* + * we have file data, set up skip (pad is set in the format + * specific sections) + */ + arcn->sb.st_mode = (arcn->sb.st_mode & 0xfff) | C_ISREG; + arcn->type = PAX_REG; + arcn->skip = arcn->sb.st_size; + break; + } + if (chk_lnk(arcn) < 0) + return(-1); + return(0); +} + +/* + * cpio_endwr() + * write the special file with the name trailer in the proper format + * Return: + * result of the write of the trailer from the cpio specific write func + */ + +int +cpio_endwr(void) +{ + ARCHD last; + + /* + * create a trailer request and call the proper format write function + */ + memset(&last, 0, sizeof(last)); + last.nlen = sizeof(TRAILER) - 1; + last.type = PAX_REG; + last.sb.st_nlink = 1; + (void)strlcpy(last.name, TRAILER, sizeof(last.name)); + return((*frmt->wr)(&last)); +} + +/* + * rd_nm() + * read in the file name which follows the cpio header + * Return: + * 0 if ok, -1 otherwise + */ + +static int +rd_nm(ARCHD *arcn, int nsz) +{ + /* + * do not even try bogus values + */ + if ((nsz == 0) || ((size_t)nsz > sizeof(arcn->name))) { + paxwarn(1, "Cpio file name length %d is out of range", nsz); + return(-1); + } + + /* + * read the name and make sure it is not empty and is \0 terminated + */ + if ((rd_wrbuf(arcn->name,nsz) != nsz) || (arcn->name[nsz-1] != '\0') || + (arcn->name[0] == '\0')) { + paxwarn(1, "Cpio file name in header is corrupted"); + return(-1); + } + return(0); +} + +/* + * rd_ln_nm() + * read in the link name for a file with links. The link name is stored + * like file data (and is NOT \0 terminated!) + * Return: + * 0 if ok, -1 otherwise + */ + +static int +rd_ln_nm(ARCHD *arcn) +{ + /* + * check the length specified for bogus values + */ + if ((arcn->sb.st_size <= 0) || + (arcn->sb.st_size >= (off_t)sizeof(arcn->ln_name))) { + paxwarn(1, "Cpio link name length is invalid: %zu", + arcn->sb.st_size); + return(-1); + } + + /* + * read in the link name and \0 terminate it + */ + if (rd_wrbuf(arcn->ln_name, (int)arcn->sb.st_size) != + (int)arcn->sb.st_size) { + paxwarn(1, "Cpio link name read error"); + return(-1); + } + arcn->ln_nlen = arcn->sb.st_size; + arcn->ln_name[arcn->ln_nlen] = '\0'; + + /* + * watch out for those empty link names + */ + if (arcn->ln_name[0] == '\0') { + paxwarn(1, "Cpio link name is corrupt"); + return(-1); + } + return(0); +} + +/* + * Routines common to the extended byte oriented cpio format + */ + +/* + * cpio_id() + * determine if a block given to us is a valid extended byte oriented + * cpio header + * Return: + * 0 if a valid header, -1 otherwise + */ + +int +cpio_id(char *blk, int size) +{ + if ((size < (int)sizeof(HD_CPIO)) || + (strncmp(blk, AMAGIC, sizeof(AMAGIC) - 1) != 0)) + return(-1); + return(0); +} + +/* + * cpio_rd() + * determine if a buffer is a byte oriented extended cpio archive entry. + * convert and store the values in the ARCHD parameter. + * Return: + * 0 if a valid header, -1 otherwise. + */ + +int +cpio_rd(ARCHD *arcn, char *buf) +{ + int nsz; + unsigned long long val; + HD_CPIO *hd; + + /* + * check that this is a valid header, if not return -1 + */ + if (cpio_id(buf, sizeof(HD_CPIO)) < 0) + return(-1); + hd = (HD_CPIO *)buf; + + /* + * byte oriented cpio (posix) does not have padding! extract the octal + * ascii fields from the header + */ + arcn->pad = 0; + arcn->sb.st_dev = (dev_t)asc_ul(hd->c_dev, sizeof(hd->c_dev), OCT); + arcn->sb.st_ino = (ino_t)asc_ul(hd->c_ino, sizeof(hd->c_ino), OCT); + arcn->sb.st_mode = (mode_t)asc_ul(hd->c_mode, sizeof(hd->c_mode), OCT); + arcn->sb.st_uid = (uid_t)asc_ul(hd->c_uid, sizeof(hd->c_uid), OCT); + arcn->sb.st_gid = (gid_t)asc_ul(hd->c_gid, sizeof(hd->c_gid), OCT); + arcn->sb.st_nlink = (nlink_t)asc_ul(hd->c_nlink, sizeof(hd->c_nlink), + OCT); + arcn->sb.st_rdev = (dev_t)asc_ul(hd->c_rdev, sizeof(hd->c_rdev), OCT); + val = asc_ull(hd->c_mtime, sizeof(hd->c_mtime), OCT); + if (val > MAX_TIME_T) + arcn->sb.st_mtime = INT_MAX; /* XXX 2038 */ + else + arcn->sb.st_mtime = val; + arcn->sb.st_mtim.tv_nsec = 0; + arcn->sb.st_ctim = arcn->sb.st_atim = arcn->sb.st_mtim; + arcn->sb.st_size = (off_t)asc_ull(hd->c_filesize,sizeof(hd->c_filesize), + OCT); + + /* + * check name size and if valid, read in the name of this entry (name + * follows header in the archive) + */ + if ((nsz = (int)asc_ul(hd->c_namesize,sizeof(hd->c_namesize),OCT)) < 2) + return(-1); + arcn->nlen = nsz - 1; + if (rd_nm(arcn, nsz) < 0) + return(-1); + + if (((arcn->sb.st_mode&C_IFMT) != C_ISLNK)||(arcn->sb.st_size == 0)) { + /* + * no link name to read for this file + */ + arcn->ln_nlen = 0; + arcn->ln_name[0] = '\0'; + return(com_rd(arcn)); + } + + /* + * check link name size and read in the link name. Link names are + * stored like file data. + */ + if (rd_ln_nm(arcn) < 0) + return(-1); + + /* + * we have a valid header (with a link) + */ + return(com_rd(arcn)); +} + +/* + * cpio_endrd() + * no cleanup needed here, just return size of the trailer (for append) + * Return: + * size of trailer header in this format + */ + +off_t +cpio_endrd(void) +{ + return sizeof(HD_CPIO) + sizeof(TRAILER); +} + +/* + * cpio_stwr() + * start up the device mapping table + * Return: + * 0 if ok, -1 otherwise (what dev_start() returns) + */ + +int +cpio_stwr(void) +{ + return(dev_start()); +} + +/* + * cpio_wr() + * copy the data in the ARCHD to buffer in extended byte oriented cpio + * format. + * Return + * 0 if file has data to be written after the header, 1 if file has NO + * data to write after the header, -1 if archive write failed + */ + +int +cpio_wr(ARCHD *arcn) +{ + HD_CPIO *hd; + int nsz; + char hdblk[sizeof(HD_CPIO)]; + + /* + * check and repair truncated device and inode fields in the header + */ + if (map_dev(arcn, CPIO_MASK, CPIO_MASK) < 0) + return(-1); + + arcn->pad = 0; + nsz = arcn->nlen + 1; + hd = (HD_CPIO *)hdblk; + if ((arcn->type != PAX_BLK) && (arcn->type != PAX_CHR)) + arcn->sb.st_rdev = 0; + + switch (arcn->type) { + case PAX_CTG: + case PAX_REG: + case PAX_HRG: + /* + * set data size for file data + */ + if (ull_asc(arcn->sb.st_size, hd->c_filesize, + sizeof(hd->c_filesize), OCT)) { + paxwarn(1,"File is too large for cpio format %s", + arcn->org_name); + return(1); + } + break; + case PAX_SLK: + /* + * set data size to hold link name + */ + if (ul_asc(arcn->ln_nlen, hd->c_filesize, + sizeof(hd->c_filesize), OCT)) + goto out; + break; + default: + /* + * all other file types have no file data + */ + if (ul_asc(0, hd->c_filesize, sizeof(hd->c_filesize), OCT)) + goto out; + break; + } + + /* + * copy the values to the header using octal ascii + */ + if (ul_asc(MAGIC, hd->c_magic, sizeof(hd->c_magic), OCT) || + ul_asc(arcn->sb.st_dev, hd->c_dev, sizeof(hd->c_dev), OCT) || + ul_asc(arcn->sb.st_ino, hd->c_ino, sizeof(hd->c_ino), OCT) || + ul_asc(arcn->sb.st_mode, hd->c_mode, sizeof(hd->c_mode), OCT) || + ul_asc(arcn->sb.st_uid, hd->c_uid, sizeof(hd->c_uid), OCT) || + ul_asc(arcn->sb.st_gid, hd->c_gid, sizeof(hd->c_gid), OCT) || + ul_asc(arcn->sb.st_nlink, hd->c_nlink, sizeof(hd->c_nlink), OCT) || + ul_asc(arcn->sb.st_rdev, hd->c_rdev, sizeof(hd->c_rdev), OCT) || + ull_asc(arcn->sb.st_mtime < 0 ? 0 : arcn->sb.st_mtime, hd->c_mtime, + sizeof(hd->c_mtime), OCT) || + ul_asc(nsz, hd->c_namesize, sizeof(hd->c_namesize), OCT)) + goto out; + + /* + * write the file name to the archive + */ + if ((wr_rdbuf(hdblk, (int)sizeof(HD_CPIO)) < 0) || + (wr_rdbuf(arcn->name, nsz) < 0)) { + paxwarn(1, "Unable to write cpio header for %s", arcn->org_name); + return(-1); + } + + /* + * if this file has data, we are done. The caller will write the file + * data, if we are link tell caller we are done, go to next file + */ + if (PAX_IS_REG(arcn->type) || (arcn->type == PAX_HRG)) + return(0); + if (arcn->type != PAX_SLK) + return(1); + + /* + * write the link name to the archive, tell the caller to go to the + * next file as we are done. + */ + if (wr_rdbuf(arcn->ln_name, arcn->ln_nlen) < 0) { + paxwarn(1,"Unable to write cpio link name for %s",arcn->org_name); + return(-1); + } + return(1); + + out: + /* + * header field is out of range + */ + paxwarn(1, "Cpio header field is too small to store file %s", + arcn->org_name); + return(1); +} + +/* + * Routines common to the system VR4 version of cpio (with/without file CRC) + */ + +/* + * vcpio_id() + * determine if a block given to us is a valid system VR4 cpio header + * WITHOUT crc. WATCH it the magic cookies are in OCTAL, the header + * uses HEX + * Return: + * 0 if a valid header, -1 otherwise + */ + +int +vcpio_id(char *blk, int size) +{ + if ((size < (int)sizeof(HD_VCPIO)) || + (strncmp(blk, AVMAGIC, sizeof(AVMAGIC) - 1) != 0)) + return(-1); + return(0); +} + +/* + * crc_id() + * determine if a block given to us is a valid system VR4 cpio header + * WITH crc. WATCH it the magic cookies are in OCTAL the header uses HEX + * Return: + * 0 if a valid header, -1 otherwise + */ + +int +crc_id(char *blk, int size) +{ + if ((size < (int)sizeof(HD_VCPIO)) || + (strncmp(blk, AVCMAGIC, sizeof(AVCMAGIC) - 1) != 0)) + return(-1); + return(0); +} + +/* + * crc_strd() + w set file data CRC calculations. Fire up the hard link detection code + * Return: + * 0 if ok -1 otherwise (the return values of lnk_start()) + */ + +int +crc_strd(void) +{ + docrc = 1; + return(lnk_start()); +} + +/* + * vcpio_rd() + * determine if a buffer is a system VR4 archive entry. (with/without CRC) + * convert and store the values in the ARCHD parameter. + * Return: + * 0 if a valid header, -1 otherwise. + */ + +int +vcpio_rd(ARCHD *arcn, char *buf) +{ + HD_VCPIO *hd; + dev_t devminor; + dev_t devmajor; + int nsz; + + /* + * during the id phase it was determined if we were using CRC, use the + * proper id routine. + */ + if (docrc) { + if (crc_id(buf, sizeof(HD_VCPIO)) < 0) + return(-1); + } else { + if (vcpio_id(buf, sizeof(HD_VCPIO)) < 0) + return(-1); + } + + hd = (HD_VCPIO *)buf; + arcn->pad = 0; + + /* + * extract the hex ascii fields from the header + */ + arcn->sb.st_ino = (ino_t)asc_ul(hd->c_ino, sizeof(hd->c_ino), HEX); + arcn->sb.st_mode = (mode_t)asc_ul(hd->c_mode, sizeof(hd->c_mode), HEX); + arcn->sb.st_uid = (uid_t)asc_ul(hd->c_uid, sizeof(hd->c_uid), HEX); + arcn->sb.st_gid = (gid_t)asc_ul(hd->c_gid, sizeof(hd->c_gid), HEX); + arcn->sb.st_mtime = (time_t)asc_ul(hd->c_mtime,sizeof(hd->c_mtime),HEX); + arcn->sb.st_mtim.tv_nsec = 0; + arcn->sb.st_ctim = arcn->sb.st_atim = arcn->sb.st_mtim; + arcn->sb.st_size = (off_t)asc_ull(hd->c_filesize, + sizeof(hd->c_filesize), HEX); + arcn->sb.st_nlink = (nlink_t)asc_ul(hd->c_nlink, sizeof(hd->c_nlink), + HEX); + devmajor = (dev_t)asc_ul(hd->c_maj, sizeof(hd->c_maj), HEX); + devminor = (dev_t)asc_ul(hd->c_min, sizeof(hd->c_min), HEX); + arcn->sb.st_dev = TODEV(devmajor, devminor); + devmajor = (dev_t)asc_ul(hd->c_rmaj, sizeof(hd->c_maj), HEX); + devminor = (dev_t)asc_ul(hd->c_rmin, sizeof(hd->c_min), HEX); + arcn->sb.st_rdev = TODEV(devmajor, devminor); + arcn->crc = asc_ul(hd->c_chksum, sizeof(hd->c_chksum), HEX); + + /* + * check the length of the file name, if ok read it in, return -1 if + * bogus + */ + if ((nsz = (int)asc_ul(hd->c_namesize,sizeof(hd->c_namesize),HEX)) < 2) + return(-1); + arcn->nlen = nsz - 1; + if (rd_nm(arcn, nsz) < 0) + return(-1); + + /* + * skip padding. header + filename is aligned to 4 byte boundaries + */ + if (rd_skip(VCPIO_PAD(sizeof(HD_VCPIO) + nsz)) < 0) + return(-1); + + /* + * if not a link (or a file with no data), calculate pad size (for + * padding which follows the file data), clear the link name and return + */ + if (((arcn->sb.st_mode&C_IFMT) != C_ISLNK)||(arcn->sb.st_size == 0)) { + /* + * we have a valid header (not a link) + */ + arcn->ln_nlen = 0; + arcn->ln_name[0] = '\0'; + arcn->pad = VCPIO_PAD(arcn->sb.st_size); + return(com_rd(arcn)); + } + + /* + * read in the link name and skip over the padding + */ + if ((rd_ln_nm(arcn) < 0) || + (rd_skip(VCPIO_PAD(arcn->sb.st_size)) < 0)) + return(-1); + + /* + * we have a valid header (with a link) + */ + return(com_rd(arcn)); +} + +/* + * vcpio_endrd() + * no cleanup needed here, just return size of the trailer (for append) + * Return: + * size of trailer header in this format + */ + +off_t +vcpio_endrd(void) +{ + return sizeof(HD_VCPIO) + sizeof(TRAILER) + + (VCPIO_PAD(sizeof(HD_VCPIO) + sizeof(TRAILER))); +} + +/* + * crc_stwr() + * start up the device mapping table, enable crc file calculation + * Return: + * 0 if ok, -1 otherwise (what dev_start() returns) + */ + +int +crc_stwr(void) +{ + docrc = 1; + return(dev_start()); +} + +/* + * vcpio_wr() + * copy the data in the ARCHD to buffer in system VR4 cpio + * (with/without crc) format. + * Return + * 0 if file has data to be written after the header, 1 if file has + * NO data to write after the header, -1 if archive write failed + */ + +int +vcpio_wr(ARCHD *arcn) +{ + HD_VCPIO *hd; + unsigned int nsz; + char hdblk[sizeof(HD_VCPIO)]; + + /* + * check and repair truncated device and inode fields in the cpio + * header + */ + if (map_dev(arcn, VCPIO_MASK, VCPIO_MASK) < 0) + return(-1); + nsz = arcn->nlen + 1; + hd = (HD_VCPIO *)hdblk; + if ((arcn->type != PAX_BLK) && (arcn->type != PAX_CHR)) + arcn->sb.st_rdev = 0; + + /* + * add the proper magic value depending whether we were asked for + * file data crc's, and the crc if needed. + */ + if (docrc) { + if (ul_asc(VCMAGIC, hd->c_magic, sizeof(hd->c_magic), OCT) || + ul_asc(arcn->crc,hd->c_chksum,sizeof(hd->c_chksum), HEX)) + goto out; + } else { + if (ul_asc(VMAGIC, hd->c_magic, sizeof(hd->c_magic), OCT) || + ul_asc(0, hd->c_chksum, sizeof(hd->c_chksum),HEX)) + goto out; + } + + switch (arcn->type) { + case PAX_CTG: + case PAX_REG: + case PAX_HRG: + /* + * caller will copy file data to the archive. tell him how + * much to pad. + */ + arcn->pad = VCPIO_PAD(arcn->sb.st_size); + if (ull_asc(arcn->sb.st_size, hd->c_filesize, + sizeof(hd->c_filesize), HEX)) { + paxwarn(1,"File is too large for sv4cpio format %s", + arcn->org_name); + return(1); + } + break; + case PAX_SLK: + /* + * no file data for the caller to process, the file data has + * the size of the link + */ + arcn->pad = 0; + if (ul_asc(arcn->ln_nlen, hd->c_filesize, + sizeof(hd->c_filesize), HEX)) + goto out; + break; + default: + /* + * no file data for the caller to process + */ + arcn->pad = 0; + if (ul_asc(0, hd->c_filesize, sizeof(hd->c_filesize), HEX)) + goto out; + break; + } + + /* + * set the other fields in the header + */ + if (ul_asc(arcn->sb.st_ino, hd->c_ino, sizeof(hd->c_ino), HEX) || + ul_asc(arcn->sb.st_mode, hd->c_mode, sizeof(hd->c_mode), HEX) || + ul_asc(arcn->sb.st_uid, hd->c_uid, sizeof(hd->c_uid), HEX) || + ul_asc(arcn->sb.st_gid, hd->c_gid, sizeof(hd->c_gid), HEX) || + ul_asc(arcn->sb.st_mtime < 0 ? 0 : arcn->sb.st_mtime, hd->c_mtime, + sizeof(hd->c_mtime), HEX) || + ul_asc(arcn->sb.st_nlink, hd->c_nlink, sizeof(hd->c_nlink), HEX) || + ul_asc(MAJOR(arcn->sb.st_dev),hd->c_maj, sizeof(hd->c_maj), HEX) || + ul_asc(MINOR(arcn->sb.st_dev),hd->c_min, sizeof(hd->c_min), HEX) || + ul_asc(MAJOR(arcn->sb.st_rdev),hd->c_rmaj,sizeof(hd->c_maj), HEX) || + ul_asc(MINOR(arcn->sb.st_rdev),hd->c_rmin,sizeof(hd->c_min), HEX) || + ul_asc(nsz, hd->c_namesize, sizeof(hd->c_namesize), HEX)) + goto out; + + /* + * write the header, the file name and padding as required. + */ + if ((wr_rdbuf(hdblk, (int)sizeof(HD_VCPIO)) < 0) || + (wr_rdbuf(arcn->name, (int)nsz) < 0) || + (wr_skip(VCPIO_PAD(sizeof(HD_VCPIO) + nsz)) < 0)) { + paxwarn(1,"Could not write sv4cpio header for %s",arcn->org_name); + return(-1); + } + + /* + * if we have file data, tell the caller we are done, copy the file + */ + if (PAX_IS_REG(arcn->type) || (arcn->type == PAX_HRG)) + return(0); + + /* + * if we are not a link, tell the caller we are done, go to next file + */ + if (arcn->type != PAX_SLK) + return(1); + + /* + * write the link name, tell the caller we are done. + */ + if ((wr_rdbuf(arcn->ln_name, arcn->ln_nlen) < 0) || + (wr_skip(VCPIO_PAD(arcn->ln_nlen)) < 0)) { + paxwarn(1,"Could not write sv4cpio link name for %s", + arcn->org_name); + return(-1); + } + return(1); + + out: + /* + * header field is out of range + */ + paxwarn(1,"Sv4cpio header field is too small for file %s",arcn->org_name); + return(1); +} + +/* + * Routines common to the old binary header cpio + */ + +/* + * bcpio_id() + * determine if a block given to us is a old binary cpio header + * (with/without header byte swapping) + * Return: + * 0 if a valid header, -1 otherwise + */ + +int +bcpio_id(char *blk, int size) +{ + if (size < (int)sizeof(HD_BCPIO)) + return(-1); + + /* + * check both normal and byte swapped magic cookies + */ + if (((u_short)SHRT_EXT(blk)) == MAGIC) + return(0); + if (((u_short)RSHRT_EXT(blk)) == MAGIC) { + if (!swp_head) + ++swp_head; + return(0); + } + return(-1); +} + +/* + * bcpio_rd() + * determine if a buffer is a old binary archive entry. (it may have byte + * swapped header) convert and store the values in the ARCHD parameter. + * This is a very old header format and should not really be used. + * Return: + * 0 if a valid header, -1 otherwise. + */ + +int +bcpio_rd(ARCHD *arcn, char *buf) +{ + HD_BCPIO *hd; + int nsz; + + /* + * check the header + */ + if (bcpio_id(buf, sizeof(HD_BCPIO)) < 0) + return(-1); + + arcn->pad = 0; + hd = (HD_BCPIO *)buf; + if (swp_head) { + /* + * header has swapped bytes on 16 bit boundaries + */ + arcn->sb.st_dev = (dev_t)(RSHRT_EXT(hd->h_dev)); + arcn->sb.st_ino = (ino_t)(RSHRT_EXT(hd->h_ino)); + arcn->sb.st_mode = (mode_t)(RSHRT_EXT(hd->h_mode)); + arcn->sb.st_uid = (uid_t)(RSHRT_EXT(hd->h_uid)); + arcn->sb.st_gid = (gid_t)(RSHRT_EXT(hd->h_gid)); + arcn->sb.st_nlink = (nlink_t)(RSHRT_EXT(hd->h_nlink)); + arcn->sb.st_rdev = (dev_t)(RSHRT_EXT(hd->h_rdev)); + arcn->sb.st_mtime = (time_t)(RSHRT_EXT(hd->h_mtime_1)); + arcn->sb.st_mtime = (arcn->sb.st_mtime << 16) | + ((time_t)(RSHRT_EXT(hd->h_mtime_2))); + arcn->sb.st_size = (off_t)(RSHRT_EXT(hd->h_filesize_1)); + arcn->sb.st_size = (arcn->sb.st_size << 16) | + ((off_t)(RSHRT_EXT(hd->h_filesize_2))); + nsz = (int)(RSHRT_EXT(hd->h_namesize)); + } else { + arcn->sb.st_dev = (dev_t)(SHRT_EXT(hd->h_dev)); + arcn->sb.st_ino = (ino_t)(SHRT_EXT(hd->h_ino)); + arcn->sb.st_mode = (mode_t)(SHRT_EXT(hd->h_mode)); + arcn->sb.st_uid = (uid_t)(SHRT_EXT(hd->h_uid)); + arcn->sb.st_gid = (gid_t)(SHRT_EXT(hd->h_gid)); + arcn->sb.st_nlink = (nlink_t)(SHRT_EXT(hd->h_nlink)); + arcn->sb.st_rdev = (dev_t)(SHRT_EXT(hd->h_rdev)); + arcn->sb.st_mtime = (time_t)(SHRT_EXT(hd->h_mtime_1)); + arcn->sb.st_mtime = (arcn->sb.st_mtime << 16) | + ((time_t)(SHRT_EXT(hd->h_mtime_2))); + arcn->sb.st_size = (off_t)(SHRT_EXT(hd->h_filesize_1)); + arcn->sb.st_size = (arcn->sb.st_size << 16) | + ((off_t)(SHRT_EXT(hd->h_filesize_2))); + nsz = (int)(SHRT_EXT(hd->h_namesize)); + } + arcn->sb.st_mtim.tv_nsec = 0; + arcn->sb.st_ctim = arcn->sb.st_atim = arcn->sb.st_mtim; + + /* + * check the file name size, if bogus give up. otherwise read the file + * name + */ + if (nsz < 2) + return(-1); + arcn->nlen = nsz - 1; + if (rd_nm(arcn, nsz) < 0) + return(-1); + + /* + * header + file name are aligned to 2 byte boundaries, skip if needed + */ + if (rd_skip(BCPIO_PAD(sizeof(HD_BCPIO) + nsz)) < 0) + return(-1); + + /* + * if not a link (or a file with no data), calculate pad size (for + * padding which follows the file data), clear the link name and return + */ + if (((arcn->sb.st_mode & C_IFMT) != C_ISLNK)||(arcn->sb.st_size == 0)){ + /* + * we have a valid header (not a link) + */ + arcn->ln_nlen = 0; + arcn->ln_name[0] = '\0'; + arcn->pad = BCPIO_PAD(arcn->sb.st_size); + return(com_rd(arcn)); + } + + if ((rd_ln_nm(arcn) < 0) || + (rd_skip(BCPIO_PAD(arcn->sb.st_size)) < 0)) + return(-1); + + /* + * we have a valid header (with a link) + */ + return(com_rd(arcn)); +} + +/* + * bcpio_endrd() + * no cleanup needed here, just return size of the trailer (for append) + * Return: + * size of trailer header in this format + */ + +off_t +bcpio_endrd(void) +{ + return sizeof(HD_BCPIO) + sizeof(TRAILER) + + (BCPIO_PAD(sizeof(HD_BCPIO) + sizeof(TRAILER))); +} + +/* + * bcpio_wr() + * copy the data in the ARCHD to buffer in old binary cpio format + * There is a real chance of field overflow with this critter. So we + * always check the conversion is ok. nobody in their right mind + * should write an archive in this format... + * Return + * 0 if file has data to be written after the header, 1 if file has NO + * data to write after the header, -1 if archive write failed + */ + +int +bcpio_wr(ARCHD *arcn) +{ + HD_BCPIO *hd; + int nsz; + char hdblk[sizeof(HD_BCPIO)]; + off_t t_offt; + int t_int; + time_t t_timet; + + /* + * check and repair truncated device and inode fields in the cpio + * header + */ + if (map_dev(arcn, BCPIO_MASK, BCPIO_MASK) < 0) + return(-1); + + if ((arcn->type != PAX_BLK) && (arcn->type != PAX_CHR)) + arcn->sb.st_rdev = 0; + hd = (HD_BCPIO *)hdblk; + + switch (arcn->type) { + case PAX_CTG: + case PAX_REG: + case PAX_HRG: + /* + * caller will copy file data to the archive. tell him how + * much to pad. + */ + arcn->pad = BCPIO_PAD(arcn->sb.st_size); + hd->h_filesize_1[0] = CHR_WR_0(arcn->sb.st_size); + hd->h_filesize_1[1] = CHR_WR_1(arcn->sb.st_size); + hd->h_filesize_2[0] = CHR_WR_2(arcn->sb.st_size); + hd->h_filesize_2[1] = CHR_WR_3(arcn->sb.st_size); + t_offt = (off_t)(SHRT_EXT(hd->h_filesize_1)); + t_offt = (t_offt<<16) | ((off_t)(SHRT_EXT(hd->h_filesize_2))); + if (arcn->sb.st_size != t_offt) { + paxwarn(1,"File is too large for bcpio format %s", + arcn->org_name); + return(1); + } + break; + case PAX_SLK: + /* + * no file data for the caller to process, the file data has + * the size of the link + */ + arcn->pad = 0; + hd->h_filesize_1[0] = CHR_WR_0(arcn->ln_nlen); + hd->h_filesize_1[1] = CHR_WR_1(arcn->ln_nlen); + hd->h_filesize_2[0] = CHR_WR_2(arcn->ln_nlen); + hd->h_filesize_2[1] = CHR_WR_3(arcn->ln_nlen); + t_int = (int)(SHRT_EXT(hd->h_filesize_1)); + t_int = (t_int << 16) | ((int)(SHRT_EXT(hd->h_filesize_2))); + if (arcn->ln_nlen != t_int) + goto out; + break; + default: + /* + * no file data for the caller to process + */ + arcn->pad = 0; + hd->h_filesize_1[0] = (char)0; + hd->h_filesize_1[1] = (char)0; + hd->h_filesize_2[0] = (char)0; + hd->h_filesize_2[1] = (char)0; + break; + } + + /* + * build up the rest of the fields + */ + hd->h_magic[0] = CHR_WR_2(MAGIC); + hd->h_magic[1] = CHR_WR_3(MAGIC); + hd->h_dev[0] = CHR_WR_2(arcn->sb.st_dev); + hd->h_dev[1] = CHR_WR_3(arcn->sb.st_dev); + if (arcn->sb.st_dev != (dev_t)(SHRT_EXT(hd->h_dev))) + goto out; + hd->h_ino[0] = CHR_WR_2(arcn->sb.st_ino); + hd->h_ino[1] = CHR_WR_3(arcn->sb.st_ino); + if (arcn->sb.st_ino != (ino_t)(SHRT_EXT(hd->h_ino))) + goto out; + hd->h_mode[0] = CHR_WR_2(arcn->sb.st_mode); + hd->h_mode[1] = CHR_WR_3(arcn->sb.st_mode); + if (arcn->sb.st_mode != (mode_t)(SHRT_EXT(hd->h_mode))) + goto out; + hd->h_uid[0] = CHR_WR_2(arcn->sb.st_uid); + hd->h_uid[1] = CHR_WR_3(arcn->sb.st_uid); + if (arcn->sb.st_uid != (uid_t)(SHRT_EXT(hd->h_uid))) + goto out; + hd->h_gid[0] = CHR_WR_2(arcn->sb.st_gid); + hd->h_gid[1] = CHR_WR_3(arcn->sb.st_gid); + if (arcn->sb.st_gid != (gid_t)(SHRT_EXT(hd->h_gid))) + goto out; + hd->h_nlink[0] = CHR_WR_2(arcn->sb.st_nlink); + hd->h_nlink[1] = CHR_WR_3(arcn->sb.st_nlink); + if (arcn->sb.st_nlink != (nlink_t)(SHRT_EXT(hd->h_nlink))) + goto out; + hd->h_rdev[0] = CHR_WR_2(arcn->sb.st_rdev); + hd->h_rdev[1] = CHR_WR_3(arcn->sb.st_rdev); + if (arcn->sb.st_rdev != (dev_t)(SHRT_EXT(hd->h_rdev))) + goto out; + if (arcn->sb.st_mtime > 0) { + hd->h_mtime_1[0] = CHR_WR_0(arcn->sb.st_mtime); + hd->h_mtime_1[1] = CHR_WR_1(arcn->sb.st_mtime); + hd->h_mtime_2[0] = CHR_WR_2(arcn->sb.st_mtime); + hd->h_mtime_2[1] = CHR_WR_3(arcn->sb.st_mtime); + t_timet = (time_t)SHRT_EXT(hd->h_mtime_1); + t_timet = t_timet << 16 | (time_t)SHRT_EXT(hd->h_mtime_2); + if (arcn->sb.st_mtime != t_timet) + goto out; + } else { + hd->h_mtime_1[0] = hd->h_mtime_1[1] = 0; + hd->h_mtime_2[0] = hd->h_mtime_2[1] = 0; + } + nsz = arcn->nlen + 1; + hd->h_namesize[0] = CHR_WR_2(nsz); + hd->h_namesize[1] = CHR_WR_3(nsz); + if (nsz != (int)(SHRT_EXT(hd->h_namesize))) + goto out; + + /* + * write the header, the file name and padding as required. + */ + if ((wr_rdbuf(hdblk, (int)sizeof(HD_BCPIO)) < 0) || + (wr_rdbuf(arcn->name, nsz) < 0) || + (wr_skip(BCPIO_PAD(sizeof(HD_BCPIO) + nsz)) < 0)) { + paxwarn(1, "Could not write bcpio header for %s", arcn->org_name); + return(-1); + } + + /* + * if we have file data, tell the caller we are done + */ + if (PAX_IS_REG(arcn->type) || (arcn->type == PAX_HRG)) + return(0); + + /* + * if we are not a link, tell the caller we are done, go to next file + */ + if (arcn->type != PAX_SLK) + return(1); + + /* + * write the link name, tell the caller we are done. + */ + if ((wr_rdbuf(arcn->ln_name, arcn->ln_nlen) < 0) || + (wr_skip(BCPIO_PAD(arcn->ln_nlen)) < 0)) { + paxwarn(1,"Could not write bcpio link name for %s",arcn->org_name); + return(-1); + } + return(1); + + out: + /* + * header field is out of range + */ + paxwarn(1,"Bcpio header field is too small for file %s", arcn->org_name); + return(1); +} |