/* $NetBSD: tar.c,v 1.73 2015/12/19 18:28:54 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 #if !defined(lint) #if 0 static char sccsid[] = "@(#)tar.c 8.2 (Berkeley) 4/18/94"; #else __RCSID("$NetBSD: tar.c,v 1.73 2015/12/19 18:28:54 christos Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #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); 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); 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; }