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Diffstat (limited to 'bin/pax/tar.c')
| -rw-r--r-- | bin/pax/tar.c | 1430 |
1 files changed, 1430 insertions, 0 deletions
diff --git a/bin/pax/tar.c b/bin/pax/tar.c new file mode 100644 index 0000000..ded2ad4 --- /dev/null +++ b/bin/pax/tar.c @@ -0,0 +1,1430 @@ +/* $NetBSD: tar.c,v 1.74 2018/11/30 00:53:11 christos 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. + */ + +#if HAVE_NBTOOL_CONFIG_H +#include "nbtool_config.h" +#endif + +#include <sys/cdefs.h> +#if !defined(lint) +#if 0 +static char sccsid[] = "@(#)tar.c 8.2 (Berkeley) 4/18/94"; +#else +__RCSID("$NetBSD: tar.c,v 1.74 2018/11/30 00:53:11 christos Exp $"); +#endif +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/time.h> +#include <sys/stat.h> +#include <sys/param.h> + +#include <ctype.h> +#include <errno.h> +#include <grp.h> +#include <pwd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "pax.h" +#include "extern.h" +#include "tar.h" + +extern struct stat tst; + +/* + * Routines for reading, writing and header identify of various versions of tar + */ + +static int expandname(char *, size_t, char **, size_t *, const char *, size_t); +static void longlink(ARCHD *, int); +static uint32_t tar_chksm(char *, int); +static char *name_split(char *, int); +static int u32_oct(uintmax_t, char *, int, int); +static int umax_oct(uintmax_t, char *, int, int); +static int tar_gnutar_exclude_one(const char *, size_t); +static int check_sum(char *, size_t, char *, size_t, int); + +/* + * Routines common to all versions of tar + */ + +static int tar_nodir; /* do not write dirs under old tar */ +int is_gnutar; /* behave like gnu tar; enable gnu + * extensions and skip end-of-volume + * checks + */ +static int seen_gnu_warning; /* Have we warned yet? */ +static char *gnu_hack_string; /* ././@LongLink hackery */ +static int gnu_hack_len; /* len of gnu_hack_string */ +char *gnu_name_string; /* ././@LongLink hackery name */ +char *gnu_link_string; /* ././@LongLink hackery link */ +size_t gnu_name_length; /* ././@LongLink hackery name */ +size_t gnu_link_length; /* ././@LongLink hackery link */ +static int gnu_short_trailer; /* gnu short trailer */ + +static const char LONG_LINK[] = "././@LongLink"; + +#ifdef _PAX_ +char DEV_0[] = "/dev/rst0"; +char DEV_1[] = "/dev/rst1"; +char DEV_4[] = "/dev/rst4"; +char DEV_5[] = "/dev/rst5"; +char DEV_7[] = "/dev/rst7"; +char DEV_8[] = "/dev/rst8"; +#endif + +static int +check_sum(char *hd, size_t hdlen, char *bl, size_t bllen, int quiet) +{ + uint32_t hdck, blck; + + hdck = asc_u32(hd, hdlen, OCT); + blck = tar_chksm(bl, bllen); + + if (hdck != blck) { + if (!quiet) + tty_warn(0, "Header checksum %o does not match %o", + hdck, blck); + return -1; + } + return 0; +} + + +/* + * tar_endwr() + * add the tar trailer of two null blocks + * Return: + * 0 if ok, -1 otherwise (what wr_skip returns) + */ + +int +tar_endwr(void) +{ + return wr_skip((off_t)(NULLCNT * BLKMULT)); +} + +/* + * tar_endrd() + * no cleanup needed here, just return size of trailer (for append) + * Return: + * size of trailer BLKMULT + */ + +off_t +tar_endrd(void) +{ + return (off_t)((gnu_short_trailer ? 1 : NULLCNT) * BLKMULT); +} + +/* + * tar_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, or 1 if the block + * could never contain a header. + */ + +int +tar_trail(char *buf, int in_resync, int *cnt) +{ + int i; + + gnu_short_trailer = 0; + /* + * look for all zero, trailer is two consecutive blocks of zero + */ + for (i = 0; i < BLKMULT; ++i) { + if (buf[i] != '\0') + break; + } + + /* + * if not all zero it is not a trailer, but MIGHT be a header. + */ + if (i != BLKMULT) + return -1; + + /* + * When given a zero block, we must be careful! + * If we are not in resync mode, check for the trailer. Have to watch + * out that we do not mis-identify file data as the trailer, so we do + * NOT try to id a trailer during resync mode. During resync mode we + * might as well throw this block out since a valid header can NEVER be + * a block of all 0 (we must have a valid file name). + */ + if (!in_resync) { + ++*cnt; + /* + * old GNU tar (up through 1.13) only writes one block of + * trailers, so we pretend we got another + */ + if (is_gnutar) { + gnu_short_trailer = 1; + ++*cnt; + } + if (*cnt >= NULLCNT) + return 0; + } + return 1; +} + +/* + * u32_oct() + * convert an uintmax_t to an octal string. many oddball field + * termination characters are used by the various versions of tar in the + * different fields. term selects which kind to use. str is '0' padded + * at the front to len. we are unable to use only one format as many old + * tar readers are very cranky about this. + * Return: + * 0 if the number fit into the string, -1 otherwise + */ + +static int +u32_oct(uintmax_t val, char *str, int len, int term) +{ + char *pt; + uint64_t p; + + p = val & TOP_HALF; + if (p && p != TOP_HALF) + return -1; + + val &= BOTTOM_HALF; + + /* + * term selects the appropriate character(s) for the end of the string + */ + pt = str + len - 1; + switch(term) { + case 3: + *pt-- = '\0'; + break; + case 2: + *pt-- = ' '; + *pt-- = '\0'; + break; + case 1: + *pt-- = ' '; + break; + case 0: + default: + *pt-- = '\0'; + *pt-- = ' '; + break; + } + + /* + * convert and blank pad if there is space + */ + while (pt >= str) { + *pt-- = '0' + (char)(val & 0x7); + if ((val = val >> 3) == 0) + break; + } + + while (pt >= str) + *pt-- = '0'; + if (val != 0) + return -1; + return 0; +} + +/* + * umax_oct() + * convert an unsigned long long to an octal string. one of many oddball + * field termination characters are used by the various versions of tar + * in the different fields. term selects which kind to use. str is '0' + * padded at the front to len. we are unable to use only one format as + * many old tar readers are very cranky about this. + * Return: + * 0 if the number fit into the string, -1 otherwise + */ + +static int +umax_oct(uintmax_t val, char *str, int len, int term) +{ + char *pt; + + /* + * term selects the appropriate character(s) for the end of the string + */ + pt = str + len - 1; + switch(term) { + case 3: + *pt-- = '\0'; + break; + case 2: + *pt-- = ' '; + *pt-- = '\0'; + break; + case 1: + *pt-- = ' '; + break; + case 0: + default: + *pt-- = '\0'; + *pt-- = ' '; + break; + } + + /* + * convert and blank pad if there is space + */ + while (pt >= str) { + *pt-- = '0' + (char)(val & 0x7); + if ((val = val >> 3) == 0) + break; + } + + while (pt >= str) + *pt-- = '0'; + if (val != 0) + return -1; + return 0; +} + +/* + * tar_chksm() + * calculate the checksum for a tar block counting the checksum field as + * all blanks (BLNKSUM is that value pre-calculated, the sum of 8 blanks). + * NOTE: we use len to short circuit summing 0's on write since we ALWAYS + * pad headers with 0. + * Return: + * unsigned long checksum + */ + +static uint32_t +tar_chksm(char *blk, int len) +{ + char *stop; + char *pt; + uint32_t chksm = BLNKSUM; /* initial value is checksum field sum */ + + /* + * add the part of the block before the checksum field + */ + pt = blk; + stop = blk + CHK_OFFSET; + while (pt < stop) + chksm += (uint32_t)(*pt++ & 0xff); + /* + * move past the checksum field and keep going, spec counts the + * checksum field as the sum of 8 blanks (which is pre-computed as + * BLNKSUM). + * ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding + * starts, no point in summing zero's) + */ + pt += CHK_LEN; + stop = blk + len; + while (pt < stop) + chksm += (uint32_t)(*pt++ & 0xff); + return chksm; +} + +/* + * Routines for old BSD style tar (also made portable to sysV tar) + */ + +/* + * tar_id() + * determine if a block given to us is a valid tar header (and not a USTAR + * header). We have to be on the lookout for those pesky blocks of all + * zero's. + * Return: + * 0 if a tar header, -1 otherwise + */ + +int +tar_id(char *blk, int size) +{ + HD_TAR *hd; + HD_USTAR *uhd; + static int is_ustar = -1; + + if (size < BLKMULT) + return -1; + hd = (HD_TAR *)blk; + uhd = (HD_USTAR *)blk; + + /* + * check for block of zero's first, a simple and fast test, then make + * sure this is not a ustar header by looking for the ustar magic + * cookie. We should use TMAGLEN, but some USTAR archive programs are + * wrong and create archives missing the \0. Last we check the + * checksum. If this is ok we have to assume it is a valid header. + */ + if (hd->name[0] == '\0') + return -1; + if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0) { + if (is_ustar == -1) { + is_ustar = 1; + return -1; + } else + tty_warn(0, + "Busted tar archive: has both ustar and old tar " + "records"); + } else + is_ustar = 0; + return check_sum(hd->chksum, sizeof(hd->chksum), blk, BLKMULT, 1); +} + +/* + * tar_opt() + * handle tar format specific -o options + * Return: + * 0 if ok -1 otherwise + */ + +int +tar_opt(void) +{ + OPLIST *opt; + + while ((opt = opt_next()) != NULL) { + if (strcmp(opt->name, TAR_OPTION) || + strcmp(opt->value, TAR_NODIR)) { + tty_warn(1, + "Unknown tar format -o option/value pair %s=%s", + opt->name, opt->value); + tty_warn(1, + "%s=%s is the only supported tar format option", + TAR_OPTION, TAR_NODIR); + return -1; + } + + /* + * we only support one option, and only when writing + */ + if ((act != APPND) && (act != ARCHIVE)) { + tty_warn(1, "%s=%s is only supported when writing.", + opt->name, opt->value); + return -1; + } + tar_nodir = 1; + } + return 0; +} + + +/* + * tar_rd() + * extract the values out of block already determined to be a tar header. + * store the values in the ARCHD parameter. + * Return: + * 0 + */ + +int +tar_rd(ARCHD *arcn, char *buf) +{ + HD_TAR *hd; + char *pt; + + /* + * we only get proper sized buffers passed to us + */ + if (tar_id(buf, BLKMULT) < 0) + return -1; + memset(arcn, 0, sizeof(*arcn)); + arcn->org_name = arcn->name; + arcn->pat = NULL; + arcn->sb.st_nlink = 1; + + /* + * copy out the name and values in the stat buffer + */ + hd = (HD_TAR *)buf; + if (hd->linkflag != LONGLINKTYPE && hd->linkflag != LONGNAMETYPE) { + arcn->nlen = expandname(arcn->name, sizeof(arcn->name), + &gnu_name_string, &gnu_name_length, hd->name, + sizeof(hd->name)); + arcn->ln_nlen = expandname(arcn->ln_name, sizeof(arcn->ln_name), + &gnu_link_string, &gnu_link_length, hd->linkname, + sizeof(hd->linkname)); + } + arcn->sb.st_mode = (mode_t)(asc_u32(hd->mode,sizeof(hd->mode),OCT) & + 0xfff); + arcn->sb.st_uid = (uid_t)asc_u32(hd->uid, sizeof(hd->uid), OCT); + arcn->sb.st_gid = (gid_t)asc_u32(hd->gid, sizeof(hd->gid), OCT); + arcn->sb.st_size = (off_t)ASC_OFFT(hd->size, sizeof(hd->size), OCT); + if (arcn->sb.st_size == -1) + return -1; + arcn->sb.st_mtime = (time_t)(int32_t)asc_u32(hd->mtime, sizeof(hd->mtime), OCT); + arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime; + + /* + * have to look at the last character, it may be a '/' and that is used + * to encode this as a directory + */ + pt = &(arcn->name[arcn->nlen - 1]); + arcn->pad = 0; + arcn->skip = 0; + switch(hd->linkflag) { + case SYMTYPE: + /* + * symbolic link, need to get the link name and set the type in + * the st_mode so -v printing will look correct. + */ + arcn->type = PAX_SLK; + arcn->sb.st_mode |= S_IFLNK; + break; + case LNKTYPE: + /* + * hard link, need to get the link name, set the type in the + * st_mode and st_nlink so -v printing will look better. + */ + arcn->type = PAX_HLK; + arcn->sb.st_nlink = 2; + + /* + * no idea of what type this thing really points at, but + * we set something for printing only. + */ + arcn->sb.st_mode |= S_IFREG; + break; + case LONGLINKTYPE: + case LONGNAMETYPE: + /* + * GNU long link/file; we tag these here and let the + * pax internals deal with it -- too ugly otherwise. + */ + if (hd->linkflag != LONGLINKTYPE) + arcn->type = PAX_GLF; + else + arcn->type = PAX_GLL; + arcn->pad = TAR_PAD(arcn->sb.st_size); + arcn->skip = arcn->sb.st_size; + break; + case AREGTYPE: + case REGTYPE: + case DIRTYPE: /* see below */ + default: + /* + * If we have a trailing / this is a directory and NOT a file. + * Note: V7 tar doesn't actually have DIRTYPE, but it was + * reported that V7 archives using USTAR directories do exist. + */ + if (*pt == '/' || hd->linkflag == DIRTYPE) { + /* + * it is a directory, set the mode for -v printing + */ + arcn->type = PAX_DIR; + arcn->sb.st_mode |= S_IFDIR; + arcn->sb.st_nlink = 2; + } else { + /* + * have a file that will be followed by data. Set the + * skip value to the size field and calculate the size + * of the padding. + */ + arcn->type = PAX_REG; + arcn->sb.st_mode |= S_IFREG; + arcn->pad = TAR_PAD(arcn->sb.st_size); + arcn->skip = arcn->sb.st_size; + } + break; + } + + /* + * strip off any trailing slash. + */ + if (*pt == '/') { + *pt = '\0'; + --arcn->nlen; + } + return 0; +} + +/* + * tar_wr() + * write a tar header for the file specified in the ARCHD to the archive. + * Have to check for file types that cannot be stored and file names that + * are too long. Be careful of the term (last arg) to u32_oct, each field + * of tar has it own spec for the termination character(s). + * ASSUMED: space after header in header block is zero filled + * 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 +tar_wr(ARCHD *arcn) +{ + HD_TAR *hd; + int len; + uintmax_t mtime; + char hdblk[sizeof(HD_TAR)]; + + /* + * check for those file system types which tar cannot store + */ + switch(arcn->type) { + case PAX_DIR: + /* + * user asked that dirs not be written to the archive + */ + if (tar_nodir) + return 1; + break; + case PAX_CHR: + tty_warn(1, "Tar cannot archive a character device %s", + arcn->org_name); + return 1; + case PAX_BLK: + tty_warn(1, + "Tar cannot archive a block device %s", arcn->org_name); + return 1; + case PAX_SCK: + tty_warn(1, "Tar cannot archive a socket %s", arcn->org_name); + return 1; + case PAX_FIF: + tty_warn(1, "Tar cannot archive a fifo %s", arcn->org_name); + return 1; + case PAX_SLK: + case PAX_HLK: + case PAX_HRG: + if (arcn->ln_nlen > (int)sizeof(hd->linkname)) { + tty_warn(1,"Link name too long for tar %s", + arcn->ln_name); + return 1; + } + break; + case PAX_REG: + case PAX_CTG: + default: + break; + } + + /* + * check file name len, remember extra char for dirs (the / at the end) + */ + len = arcn->nlen; + if (arcn->type == PAX_DIR) + ++len; + if (len >= (int)sizeof(hd->name)) { + tty_warn(1, "File name too long for tar %s", arcn->name); + return 1; + } + + /* + * copy the data out of the ARCHD into the tar header based on the type + * of the file. Remember many tar readers want the unused fields to be + * padded with zero. We set the linkflag field (type), the linkname + * (or zero if not used),the size, and set the padding (if any) to be + * added after the file data (0 for all other types, as they only have + * a header) + */ + memset(hdblk, 0, sizeof(hdblk)); + hd = (HD_TAR *)hdblk; + strlcpy(hd->name, arcn->name, sizeof(hd->name)); + arcn->pad = 0; + + if (arcn->type == PAX_DIR) { + /* + * directories are the same as files, except have a filename + * that ends with a /, we add the slash here. No data follows, + * dirs, so no pad. + */ + hd->linkflag = AREGTYPE; + hd->name[len-1] = '/'; + if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 1)) + goto out; + } else if (arcn->type == PAX_SLK) { + /* + * no data follows this file, so no pad + */ + hd->linkflag = SYMTYPE; + strlcpy(hd->linkname, arcn->ln_name, sizeof(hd->linkname)); + if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 1)) + goto out; + } else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) { + /* + * no data follows this file, so no pad + */ + hd->linkflag = LNKTYPE; + strlcpy(hd->linkname, arcn->ln_name, sizeof(hd->linkname)); + if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 1)) + goto out; + } else { + /* + * data follows this file, so set the pad + */ + hd->linkflag = AREGTYPE; + if (OFFT_OCT(arcn->sb.st_size, hd->size, sizeof(hd->size), 1)) { + tty_warn(1,"File is too large for tar %s", + arcn->org_name); + return 1; + } + arcn->pad = TAR_PAD(arcn->sb.st_size); + } + + /* + * copy those fields that are independent of the type + */ + mtime = tst.st_ino ? tst.st_mtime : arcn->sb.st_mtime; + if (u32_oct((uintmax_t)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) || + u32_oct((uintmax_t)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) || + u32_oct((uintmax_t)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) || + u32_oct(mtime, hd->mtime, sizeof(hd->mtime), 1)) + goto out; + + /* + * calculate and add the checksum, then write the header. A return of + * 0 tells the caller to now write the file data, 1 says no data needs + * to be written + */ + if (u32_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum, + sizeof(hd->chksum), 3)) + goto out; /* XXX Something's wrong here + * because a zero-byte file can + * cause this to be done and + * yet the resulting warning + * seems incorrect */ + + if (wr_rdbuf(hdblk, sizeof(HD_TAR)) < 0) + return -1; + if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0) + return -1; + if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG)) + return 0; + return 1; + + out: + /* + * header field is out of range + */ + tty_warn(1, "Tar header field is too small for %s", arcn->org_name); + return 1; +} + +/* + * Routines for POSIX ustar + */ + +/* + * ustar_strd() + * initialization for ustar read + * Return: + * 0 if ok, -1 otherwise + */ + +int +ustar_strd(void) +{ + return 0; +} + +/* + * ustar_stwr() + * initialization for ustar write + * Return: + * 0 if ok, -1 otherwise + */ + +int +ustar_stwr(void) +{ + return 0; +} + +/* + * ustar_id() + * determine if a block given to us is a valid ustar header. We have to + * be on the lookout for those pesky blocks of all zero's + * Return: + * 0 if a ustar header, -1 otherwise + */ + +int +ustar_id(char *blk, int size) +{ + HD_USTAR *hd; + + if (size < BLKMULT) + return -1; + hd = (HD_USTAR *)blk; + + /* + * check for block of zero's first, a simple and fast test then check + * ustar magic cookie. We should use TMAGLEN, but some USTAR archive + * programs are fouled up and create archives missing the \0. Last we + * check the checksum. If ok we have to assume it is a valid header. + */ + if (hd->name[0] == '\0') + return -1; + if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0) + return -1; + /* This is GNU tar */ + if (strncmp(hd->magic, "ustar ", 8) == 0 && !is_gnutar && + !seen_gnu_warning) { + seen_gnu_warning = 1; + tty_warn(0, + "Trying to read GNU tar archive with GNU extensions and end-of-volume checks off"); + } + return check_sum(hd->chksum, sizeof(hd->chksum), blk, BLKMULT, 0); +} + +/* + * ustar_rd() + * extract the values out of block already determined to be a ustar header. + * store the values in the ARCHD parameter. + * Return: + * 0 + */ + +int +ustar_rd(ARCHD *arcn, char *buf) +{ + HD_USTAR *hd; + char *dest; + int cnt; + dev_t devmajor; + dev_t devminor; + + /* + * we only get proper sized buffers + */ + if (ustar_id(buf, BLKMULT) < 0) + return -1; + + memset(arcn, 0, sizeof(*arcn)); + arcn->org_name = arcn->name; + arcn->pat = NULL; + arcn->sb.st_nlink = 1; + hd = (HD_USTAR *)buf; + + /* + * see if the filename is split into two parts. if, so joint the parts. + * we copy the prefix first and add a / between the prefix and name. + */ + dest = arcn->name; + if (*(hd->prefix) != '\0') { + cnt = strlcpy(arcn->name, hd->prefix, sizeof(arcn->name)); + dest += cnt; + *dest++ = '/'; + cnt++; + } else { + cnt = 0; + } + + if (hd->typeflag != LONGLINKTYPE && hd->typeflag != LONGNAMETYPE) { + arcn->nlen = expandname(dest, sizeof(arcn->name) - cnt, + &gnu_name_string, &gnu_name_length, hd->name, + sizeof(hd->name)) + cnt; + arcn->ln_nlen = expandname(arcn->ln_name, + sizeof(arcn->ln_name), &gnu_link_string, &gnu_link_length, + hd->linkname, sizeof(hd->linkname)); + } + + /* + * follow the spec to the letter. we should only have mode bits, strip + * off all other crud we may be passed. + */ + arcn->sb.st_mode = (mode_t)(asc_u32(hd->mode, sizeof(hd->mode), OCT) & + 0xfff); + arcn->sb.st_size = (off_t)ASC_OFFT(hd->size, sizeof(hd->size), OCT); + if (arcn->sb.st_size == -1) + return -1; + arcn->sb.st_mtime = (time_t)(int32_t)asc_u32(hd->mtime, sizeof(hd->mtime), OCT); + arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime; + + /* + * If we can find the ascii names for gname and uname in the password + * and group files we will use the uid's and gid they bind. Otherwise + * we use the uid and gid values stored in the header. (This is what + * the posix spec wants). + */ + hd->gname[sizeof(hd->gname) - 1] = '\0'; + if (gid_from_group(hd->gname, &(arcn->sb.st_gid)) < 0) + arcn->sb.st_gid = (gid_t)asc_u32(hd->gid, sizeof(hd->gid), OCT); + hd->uname[sizeof(hd->uname) - 1] = '\0'; + if (uid_from_user(hd->uname, &(arcn->sb.st_uid)) < 0) + arcn->sb.st_uid = (uid_t)asc_u32(hd->uid, sizeof(hd->uid), OCT); + + /* + * set the defaults, these may be changed depending on the file type + */ + arcn->pad = 0; + arcn->skip = 0; + arcn->sb.st_rdev = (dev_t)0; + + /* + * set the mode and PAX type according to the typeflag in the header + */ + switch(hd->typeflag) { + case FIFOTYPE: + arcn->type = PAX_FIF; + arcn->sb.st_mode |= S_IFIFO; + break; + case DIRTYPE: + arcn->type = PAX_DIR; + arcn->sb.st_mode |= S_IFDIR; + arcn->sb.st_nlink = 2; + + /* + * Some programs that create ustar archives append a '/' + * to the pathname for directories. This clearly violates + * ustar specs, but we will silently strip it off anyway. + */ + if (arcn->name[arcn->nlen - 1] == '/') + arcn->name[--arcn->nlen] = '\0'; + break; + case BLKTYPE: + case CHRTYPE: + /* + * this type requires the rdev field to be set. + */ + if (hd->typeflag == BLKTYPE) { + arcn->type = PAX_BLK; + arcn->sb.st_mode |= S_IFBLK; + } else { + arcn->type = PAX_CHR; + arcn->sb.st_mode |= S_IFCHR; + } + devmajor = (dev_t)asc_u32(hd->devmajor,sizeof(hd->devmajor),OCT); + devminor = (dev_t)asc_u32(hd->devminor,sizeof(hd->devminor),OCT); + arcn->sb.st_rdev = TODEV(devmajor, devminor); + break; + case SYMTYPE: + case LNKTYPE: + if (hd->typeflag == SYMTYPE) { + arcn->type = PAX_SLK; + arcn->sb.st_mode |= S_IFLNK; + } else { + arcn->type = PAX_HLK; + /* + * so printing looks better + */ + arcn->sb.st_mode |= S_IFREG; + arcn->sb.st_nlink = 2; + } + break; + case LONGLINKTYPE: + case LONGNAMETYPE: + if (is_gnutar) { + /* + * GNU long link/file; we tag these here and let the + * pax internals deal with it -- too ugly otherwise. + */ + if (hd->typeflag != LONGLINKTYPE) + arcn->type = PAX_GLF; + else + arcn->type = PAX_GLL; + arcn->pad = TAR_PAD(arcn->sb.st_size); + arcn->skip = arcn->sb.st_size; + } else { + tty_warn(1, "GNU Long %s found in posix ustar archive.", + hd->typeflag == LONGLINKTYPE ? "Link" : "File"); + } + break; + case FILEXTYPE: + case GLOBXTYPE: + tty_warn(0, "%s extended headers posix ustar archive." + " Extracting as plain files. Following files might be" + " in the wrong directory or have wrong attributes.", + hd->typeflag == FILEXTYPE ? "File" : "Global"); + /*FALLTHROUGH*/ + case CONTTYPE: + case AREGTYPE: + case REGTYPE: + default: + /* + * these types have file data that follows. Set the skip and + * pad fields. + */ + arcn->type = PAX_REG; + arcn->pad = TAR_PAD(arcn->sb.st_size); + arcn->skip = arcn->sb.st_size; + arcn->sb.st_mode |= S_IFREG; + break; + } + return 0; +} + +static int +expandname(char *buf, size_t len, char **gnu_name, size_t *gnu_length, + const char *name, size_t nlen) +{ + if (*gnu_name) { + len = strlcpy(buf, *gnu_name, len); + free(*gnu_name); + *gnu_name = NULL; + *gnu_length = 0; + } else { + if (len > ++nlen) + len = nlen; + len = strlcpy(buf, name, len); + } + return len; +} + +static void +longlink(ARCHD *arcn, int type) +{ + ARCHD larc; + + (void)memset(&larc, 0, sizeof(larc)); + + larc.type = type; + larc.nlen = strlcpy(larc.name, LONG_LINK, sizeof(larc.name)); + + switch (type) { + case PAX_GLL: + gnu_hack_string = arcn->ln_name; + gnu_hack_len = arcn->ln_nlen + 1; + break; + case PAX_GLF: + gnu_hack_string = arcn->name; + gnu_hack_len = arcn->nlen + 1; + break; + default: + errx(1, "Invalid type in GNU longlink %d", type); + } + + /* + * We need a longlink now. + */ + ustar_wr(&larc); +} + +/* + * ustar_wr() + * write a ustar header for the file specified in the ARCHD to the archive + * Have to check for file types that cannot be stored and file names that + * are too long. Be careful of the term (last arg) to u32_oct, we only use + * '\0' for the termination character (this is different than picky tar) + * ASSUMED: space after header in header block is zero filled + * 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 + */ + +static int +size_err(const char *what, ARCHD *arcn) +{ + /* + * header field is out of range + */ + tty_warn(1, "Ustar %s header field is too small for %s", + what, arcn->org_name); + return 1; +} + +int +ustar_wr(ARCHD *arcn) +{ + HD_USTAR *hd; + char *pt; + uintmax_t mtime; + char hdblk[sizeof(HD_USTAR)]; + const char *user, *group; + + switch (arcn->type) { + case PAX_SCK: + /* + * check for those file system types ustar cannot store + */ + if (!is_gnutar) + tty_warn(1, "Ustar cannot archive a socket %s", + arcn->org_name); + return 1; + + case PAX_SLK: + case PAX_HLK: + case PAX_HRG: + /* + * check the length of the linkname + */ + if (arcn->ln_nlen >= (int)sizeof(hd->linkname)) { + if (is_gnutar) { + longlink(arcn, PAX_GLL); + } else { + tty_warn(1, "Link name too long for ustar %s", + arcn->ln_name); + return 1; + } + } + break; + default: + break; + } + + /* + * split the path name into prefix and name fields (if needed). if + * pt != arcn->name, the name has to be split + */ + if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) { + if (is_gnutar) { + longlink(arcn, PAX_GLF); + pt = arcn->name; + } else { + tty_warn(1, "File name too long for ustar %s", + arcn->name); + return 1; + } + } + + /* + * zero out the header so we don't have to worry about zero fill below + */ + memset(hdblk, 0, sizeof(hdblk)); + hd = (HD_USTAR *)hdblk; + arcn->pad = 0L; + + /* + * split the name, or zero out the prefix + */ + if (pt != arcn->name) { + /* + * name was split, pt points at the / where the split is to + * occur, we remove the / and copy the first part to the prefix + */ + *pt = '\0'; + strlcpy(hd->prefix, arcn->name, sizeof(hd->prefix)); + *pt++ = '/'; + } + + /* + * copy the name part. this may be the whole path or the part after + * the prefix + */ + strlcpy(hd->name, pt, sizeof(hd->name)); + + /* + * set the fields in the header that are type dependent + */ + switch(arcn->type) { + case PAX_DIR: + hd->typeflag = DIRTYPE; + if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 3)) + return size_err("DIRTYPE", arcn); + break; + case PAX_CHR: + case PAX_BLK: + if (arcn->type == PAX_CHR) + hd->typeflag = CHRTYPE; + else + hd->typeflag = BLKTYPE; + if (u32_oct((uintmax_t)MAJOR(arcn->sb.st_rdev), hd->devmajor, + sizeof(hd->devmajor), 3) || + u32_oct((uintmax_t)MINOR(arcn->sb.st_rdev), hd->devminor, + sizeof(hd->devminor), 3) || + u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 3)) + return size_err("DEVTYPE", arcn); + break; + case PAX_FIF: + hd->typeflag = FIFOTYPE; + if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 3)) + return size_err("FIFOTYPE", arcn); + break; + case PAX_GLL: + case PAX_SLK: + case PAX_HLK: + case PAX_HRG: + if (arcn->type == PAX_SLK) + hd->typeflag = SYMTYPE; + else if (arcn->type == PAX_GLL) + hd->typeflag = LONGLINKTYPE; + else + hd->typeflag = LNKTYPE; + strlcpy(hd->linkname, arcn->ln_name, sizeof(hd->linkname)); + if (u32_oct((uintmax_t)gnu_hack_len, hd->size, + sizeof(hd->size), 3)) + return size_err("LINKTYPE", arcn); + break; + case PAX_GLF: + case PAX_REG: + case PAX_CTG: + default: + /* + * file data with this type, set the padding + */ + if (arcn->type == PAX_GLF) { + hd->typeflag = LONGNAMETYPE; + arcn->pad = TAR_PAD(gnu_hack_len); + if (OFFT_OCT((uint32_t)gnu_hack_len, hd->size, + sizeof(hd->size), 3)) { + tty_warn(1,"File is too long for ustar %s", + arcn->org_name); + return 1; + } + } else { + if (arcn->type == PAX_CTG) + hd->typeflag = CONTTYPE; + else + hd->typeflag = REGTYPE; + arcn->pad = TAR_PAD(arcn->sb.st_size); + if (OFFT_OCT(arcn->sb.st_size, hd->size, + sizeof(hd->size), 3)) { + tty_warn(1,"File is too long for ustar %s", + arcn->org_name); + return 1; + } + } + break; + } + + strncpy(hd->magic, TMAGIC, TMAGLEN); + if (is_gnutar) + hd->magic[TMAGLEN - 1] = hd->version[0] = ' '; + else + strncpy(hd->version, TVERSION, TVERSLEN); + + /* + * set the remaining fields. Some versions want all 16 bits of mode + * we better humor them (they really do not meet spec though).... + */ + if (u32_oct((uintmax_t)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3)) + return size_err("MODE", arcn); + if (u32_oct((uintmax_t)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3)) + return size_err("UID", arcn); + if (u32_oct((uintmax_t)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3)) + return size_err("GID", arcn); + mtime = tst.st_ino ? tst.st_mtime : arcn->sb.st_mtime; + if (u32_oct(mtime, hd->mtime, sizeof(hd->mtime), 3)) + return size_err("MTIME", arcn); + user = user_from_uid(arcn->sb.st_uid, 1); + group = group_from_gid(arcn->sb.st_gid, 1); + strncpy(hd->uname, user ? user : "", sizeof(hd->uname)); + strncpy(hd->gname, group ? group : "", sizeof(hd->gname)); + + /* + * calculate and store the checksum write the header to the archive + * return 0 tells the caller to now write the file data, 1 says no data + * needs to be written + */ + if (u32_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum, + sizeof(hd->chksum), 3)) + return size_err("CHKSUM", arcn); + if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0) + return -1; + if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0) + return -1; + if (gnu_hack_string) { + int res = wr_rdbuf(gnu_hack_string, gnu_hack_len); + int pad = gnu_hack_len; + gnu_hack_string = NULL; + gnu_hack_len = 0; + if (res < 0) + return -1; + if (wr_skip((off_t)(BLKMULT - (pad % BLKMULT))) < 0) + return -1; + } + if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG)) + return 0; + return 1; +} + +/* + * name_split() + * see if the name has to be split for storage in a ustar header. We try + * to fit the entire name in the name field without splitting if we can. + * The split point is always at a / + * Return + * character pointer to split point (always the / that is to be removed + * if the split is not needed, the points is set to the start of the file + * name (it would violate the spec to split there). A NULL is returned if + * the file name is too long + */ + +static char * +name_split(char *name, int len) +{ + char *start; + + /* + * check to see if the file name is small enough to fit in the name + * field. if so just return a pointer to the name. + */ + if (len < TNMSZ) + return name; + /* + * GNU tar does not honor the prefix+name mode if the magic + * is not "ustar\0". So in GNU tar compatibility mode, we don't + * split the filename into prefix+name because we are setting + * the magic to "ustar " as GNU tar does. This of course will + * end up creating a LongLink record in cases where it does not + * really need do, but we are behaving like GNU tar after all. + */ + if (is_gnutar || len > (TPFSZ + TNMSZ)) + return NULL; + + /* + * we start looking at the biggest sized piece that fits in the name + * field. We walk forward looking for a slash to split at. The idea is + * to find the biggest piece to fit in the name field (or the smallest + * prefix we can find) (the -1 is correct the biggest piece would + * include the slash between the two parts that gets thrown away) + */ + start = name + len - TNMSZ; + while ((*start != '\0') && (*start != '/')) + ++start; + + /* + * if we hit the end of the string, this name cannot be split, so we + * cannot store this file. + */ + if (*start == '\0') + return NULL; + len = start - name; + + /* + * NOTE: /str where the length of str == TNMSZ cannot be stored under + * the p1003.1-1990 spec for ustar. We could force a prefix of / and + * the file would then expand on extract to //str. The len == 0 below + * makes this special case follow the spec to the letter. + */ + if ((len >= TPFSZ) || (len == 0)) + return NULL; + + /* + * ok have a split point, return it to the caller + */ + return start; +} + +/* + * convert a glob into a RE, and add it to the list. we convert to + * four different RE's (because we're using BRE's and can't use | + * alternation :-() with this padding: + * .*\/ and $ + * .*\/ and \/.* + * ^ and $ + * ^ and \/.* + */ +static int +tar_gnutar_exclude_one(const char *line, size_t len) +{ + /* 2 * buffer len + nul */ + char sbuf[MAXPATHLEN * 2 + 1]; + /* + / + // + .*""/\/ + \/.* */ + char rabuf[MAXPATHLEN * 2 + 1 + 1 + 2 + 4 + 4]; + size_t i; + int j = 0; + + if (line[len - 1] == '\n') + len--; + for (i = 0; i < len; i++) { + /* + * convert glob to regexp, escaping everything + */ + if (line[i] == '*') + sbuf[j++] = '.'; + else if (line[i] == '?') { + sbuf[j++] = '.'; + continue; + } else if (!isalnum((unsigned char)line[i]) && + !isblank((unsigned char)line[i])) + sbuf[j++] = '\\'; + sbuf[j++] = line[i]; + } + sbuf[j] = '\0'; + /* don't need the .*\/ ones if we start with /, i guess */ + if (line[0] != '/') { + (void)snprintf(rabuf, sizeof rabuf, "/.*\\/%s$//", sbuf); + if (rep_add(rabuf) < 0) + return (-1); + (void)snprintf(rabuf, sizeof rabuf, "/.*\\/%s\\/.*//", sbuf); + if (rep_add(rabuf) < 0) + return (-1); + } + + (void)snprintf(rabuf, sizeof rabuf, "/^%s$//", sbuf); + if (rep_add(rabuf) < 0) + return (-1); + (void)snprintf(rabuf, sizeof rabuf, "/^%s\\/.*//", sbuf); + if (rep_add(rabuf) < 0) + return (-1); + + return (0); +} + +/* + * deal with GNU tar -X/--exclude-from & --exclude switchs. basically, + * we go through each line of the file, building a string from the "glob" + * lines in the file into RE lines, of the form `/^RE$//', which we pass + * to rep_add(), which will add a empty replacement (exclusion), for the + * named files. + */ +int +tar_gnutar_minus_minus_exclude(const char *path) +{ + size_t len = strlen(path); + + if (len > MAXPATHLEN) + tty_warn(0, "pathname too long: %s", path); + + return (tar_gnutar_exclude_one(path, len)); +} + +int +tar_gnutar_X_compat(const char *path) +{ + char *line; + FILE *fp; + int lineno = 0; + size_t len; + + if (path[0] == '-' && path[1] == '\0') + fp = stdin; + else { + fp = fopen(path, "r"); + if (fp == NULL) { + tty_warn(1, "cannot open %s: %s", path, + strerror(errno)); + return -1; + } + } + + while ((line = fgetln(fp, &len))) { + lineno++; + if (len > MAXPATHLEN) { + tty_warn(0, "pathname too long, line %d of %s", + lineno, path); + } + if (tar_gnutar_exclude_one(line, len)) + return -1; + } + if (fp != stdin) + fclose(fp); + return 0; +} |