+/*-
+ * Copyright (c) 1992 Keith Muller.
+ * Copyright (c) 1992 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.
+ *
+ * %sccs.include.redist.c%
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)tar.c 1.1 (Berkeley) %G%";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <string.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include "pax.h"
+#include "extern.h"
+#include "tar.h"
+
+/*
+ * Routines for reading, writing and header identify of various versions of tar
+ */
+
+static u_long tar_chksm __P((register char *, register int));
+static char *name_split __P((register char *, register int));
+static int ul_oct __P((u_long, register char *, register int, int));
+#ifndef NET2_STAT
+static int uqd_oct __P((u_quad_t, register char *, register int, int));
+#endif
+
+/*
+ * Routines common to all versions of tar
+ */
+
+static int tar_nodir; /* do not write dirs under old tar */
+
+/*
+ * tar_endwr()
+ * add the tar trailer of two null blocks
+ * Return:
+ * 0 if ok, -1 otherwise (what wr_skip returns)
+ */
+
+#if __STDC__
+int
+tar_endwr(void)
+#else
+int
+tar_endwr()
+#endif
+{
+ return(wr_skip((off_t)(NULLCNT*BLKMULT)));
+}
+
+/*
+ * tar_endrd()
+ * no cleanup needed here, just return size of trailer (for append)
+ * Return:
+ * size of trailer (2 * BLKMULT)
+ */
+
+#if __STDC__
+off_t
+tar_endrd(void)
+#else
+off_t
+tar_endrd()
+#endif
+{
+ return((off_t)(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.
+ */
+
+#if __STDC__
+int
+tar_trail(register char *buf, register int in_resync, register int *cnt)
+#else
+int
+tar_trail(buf, in_resync, cnt)
+ register char *buf;
+ register int in_resync;
+ register int *cnt;
+#endif
+{
+ register int i;
+
+ /*
+ * 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 >= NULLCNT))
+ return(0);
+ return(1);
+}
+
+/*
+ * ul_oct()
+ * convert an unsigned 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 BLANK 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
+ */
+
+#if __STDC__
+static int
+ul_oct(u_long val, register char *str, register int len, int term)
+#else
+static int
+ul_oct(val, str, len, term)
+ u_long val;
+ register char *str;
+ register int len;
+ int term;
+#endif
+{
+ register 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) == (u_long)0)
+ break;
+ }
+
+ while (pt >= str)
+ *pt-- = ' ';
+ if (val != (u_long)0)
+ return(-1);
+ return(0);
+}
+
+#ifndef NET2_STAT
+/*
+ * uqd_oct()
+ * convert an u_quad_t 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 BLANK 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
+ */
+
+#if __STDC__
+static int
+uqd_oct(u_quad_t val, register char *str, register int len, int term)
+#else
+static int
+uqd_oct(val, str, len, term)
+ u_quad_t val;
+ register char *str;
+ register int len;
+ int term;
+#endif
+{
+ register 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-- = ' ';
+ if (val != (u_quad_t)0)
+ return(-1);
+ return(0);
+}
+#endif
+
+/*
+ * tar_chksm()
+ * calculate the checksum for a tar block counting the checksum field as
+ * all blanks (BLNKSUM is that value pre-calculated, the sume 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
+ */
+
+#if __STDC__
+static u_long
+tar_chksm(register char *blk, register int len)
+#else
+static u_long
+tar_chksm(blk, len)
+ register char *blk;
+ register int len;
+#endif
+{
+ register char *stop;
+ register char *pt;
+ u_long chksm = BLNKSUM; /* inital 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 += (u_long)(*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 += (u_long)(*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
+ */
+
+#if __STDC__
+int
+tar_id(register char *blk, int size)
+#else
+int
+tar_id(blk, size)
+ register char *blk;
+ int size;
+#endif
+{
+ register HD_TAR *hd;
+ register HD_USTAR *uhd;
+
+ 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)
+ return(-1);
+ if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
+ return(-1);
+ return(0);
+}
+
+/*
+ * tar_opt()
+ * handle tar format specific -o options
+ * Return:
+ * 0 if ok -1 otherwise
+ */
+
+#if __STDC__
+int
+tar_opt(void)
+#else
+int
+tar_opt()
+#endif
+{
+ OPLIST *opt;
+
+ while ((opt = opt_next()) != NULL) {
+ if (strcmp(opt->name, TAR_OPTION) ||
+ strcmp(opt->value, TAR_NODIR)) {
+ warn(1, "Unknown tar format -o option/value pair %s=%s",
+ opt->name, opt->value);
+ 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)) {
+ 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
+ */
+
+#if __STDC__
+int
+tar_rd(register ARCHD *arcn, register char *buf)
+#else
+int
+tar_rd(arcn, buf)
+ register ARCHD *arcn;
+ register char *buf;
+#endif
+{
+ register HD_TAR *hd;
+ register char *pt;
+
+ /*
+ * we only get proper sized buffers passed to us
+ */
+ if (tar_id(buf, BLKMULT) < 0)
+ return(-1);
+ arcn->org_name = arcn->name;
+ arcn->sb.st_nlink = 1;
+ arcn->pat = NULL;
+
+ /*
+ * copy out the name and values in the stat buffer
+ */
+ hd = (HD_TAR *)buf;
+ arcn->nlen = l_strncpy(arcn->name, hd->name, sizeof(hd->name));
+ arcn->name[arcn->nlen] = '\0';
+ arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode,sizeof(hd->mode),OCT) &
+ 0xfff);
+ arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
+ arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
+ arcn->sb.st_size = (size_t)asc_ul(hd->size, sizeof(hd->size), OCT);
+ arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
+ 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->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
+ sizeof(hd->linkname));
+ arcn->ln_name[arcn->ln_nlen] = '\0';
+ 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;
+ arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
+ sizeof(hd->linkname));
+ arcn->ln_name[arcn->ln_nlen] = '\0';
+ /*
+ * 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 AREGTYPE:
+ case REGTYPE:
+ default:
+ /*
+ * If we have a trailing / this is a directory and NOT a file.
+ */
+ arcn->ln_name[0] = '\0';
+ arcn->ln_nlen = 0;
+ if (*pt == '/') {
+ /*
+ * 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 caluculate 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'; /* remove trailing / */
+ --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 ul_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
+ */
+
+#if __STDC__
+int
+tar_wr(register ARCHD *arcn)
+#else
+int
+tar_wr(arcn)
+ register ARCHD *arcn;
+#endif
+{
+ register HD_TAR *hd;
+ int len;
+ 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:
+ warn(1, "Tar cannot archive a character device %s",
+ arcn->org_name);
+ return(1);
+ case PAX_BLK:
+ warn(1, "Tar cannot archive a block device %s", arcn->org_name);
+ return(1);
+ case PAX_SCK:
+ warn(1, "Tar cannot archive a socket %s", arcn->org_name);
+ return(1);
+ case PAX_FIF:
+ 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 > sizeof(hd->linkname)) {
+ 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 > sizeof(hd->name)) {
+ 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)
+ */
+ hd = (HD_TAR *)hdblk;
+ zf_strncpy(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;
+ bzero(hd->linkname, sizeof(hd->linkname));
+ hd->name[len-1] = '/';
+ if (ul_oct((u_long)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;
+ zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname));
+ if (ul_oct((u_long)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;
+ zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname));
+ if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
+ goto out;
+ } else {
+ /*
+ * data follows this file, so set the pad
+ */
+ hd->linkflag = AREGTYPE;
+ bzero(hd->linkname, sizeof(hd->linkname));
+# ifdef NET2_STAT
+ if (ul_oct((u_long)arcn->sb.st_size, hd->size,
+ sizeof(hd->size), 1)) {
+# else
+ if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
+ sizeof(hd->size), 1)) {
+# endif
+ 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
+ */
+ if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) ||
+ ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) ||
+ ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) ||
+ ul_oct((u_long)arcn->sb.st_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 (ul_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum,
+ sizeof(hd->chksum), 2))
+ goto out;
+ 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
+ */
+ 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
+ */
+
+#if __STDC__
+int
+ustar_strd(void)
+#else
+int
+ustar_strd()
+#endif
+{
+ if ((usrtb_start() < 0) || (grptb_start() < 0))
+ return(-1);
+ return(0);
+}
+
+/*
+ * ustar_stwr()
+ * initialization for ustar write
+ * Return:
+ * 0 if ok, -1 otherwise
+ */
+
+#if __STDC__
+int
+ustar_stwr(void)
+#else
+int
+ustar_stwr()
+#endif
+{
+ if ((uidtb_start() < 0) || (gidtb_start() < 0))
+ return(-1);
+ 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
+ */
+
+#if __STDC__
+int
+ustar_id(char *blk, int size)
+#else
+int
+ustar_id(blk, size)
+ char *blk;
+ int size;
+#endif
+{
+ register 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);
+ if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
+ return(-1);
+ return(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
+ */
+
+#if __STDC__
+int
+ustar_rd(register ARCHD *arcn, register char *buf)
+#else
+int
+ustar_rd(arcn, buf)
+ register ARCHD *arcn;
+ register char *buf;
+#endif
+{
+ register HD_USTAR *hd;
+ register char *dest;
+ register int cnt = 0;
+ dev_t devmajor;
+ dev_t devminor;
+
+ /*
+ * we only get proper sized buffers
+ */
+ if (ustar_id(buf, BLKMULT) < 0)
+ return(-1);
+ arcn->org_name = arcn->name;
+ arcn->sb.st_nlink = 1;
+ arcn->pat = NULL;
+ 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 = l_strncpy(arcn->name, hd->prefix, sizeof(hd->prefix));
+ dest = arcn->name + arcn->nlen;
+ *dest++ = '/';
+ }
+ arcn->nlen = l_strncpy(dest, hd->name, sizeof(hd->name));
+ arcn->nlen += cnt;
+ arcn->name[arcn->nlen] = '\0';
+
+ /*
+ * 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_ul(hd->mode, sizeof(hd->mode), OCT) &
+ 0xfff);
+ arcn->sb.st_size = (size_t)asc_ul(hd->size, sizeof(hd->size), OCT);
+ arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
+ 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.
+ */
+ hd->gname[sizeof(hd->gname) - 1] = '\0';
+ if (gid_name(hd->gname, &(arcn->sb.st_gid)) < 0)
+ arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
+ hd->uname[sizeof(hd->uname) - 1] = '\0';
+ if (uid_name(hd->uname, &(arcn->sb.st_uid)) < 0)
+ arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
+
+ /*
+ * set the defaults, these may be changed depending on the file type
+ */
+ arcn->ln_name[0] = '\0';
+ arcn->ln_nlen = 0;
+ 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;
+ 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_ul(hd->devmajor,sizeof(hd->devmajor),OCT);
+ devminor = (dev_t)asc_ul(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;
+ }
+ /*
+ * copy the link name
+ */
+ arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
+ sizeof(hd->linkname));
+ arcn->ln_name[arcn->ln_nlen] = '\0';
+ break;
+ 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);
+}
+
+/*
+ * 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 ul_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
+ */
+
+#if __STDC__
+int
+ustar_wr(register ARCHD *arcn)
+#else
+int
+ustar_wr(arcn)
+ register ARCHD *arcn;
+#endif
+{
+ register HD_USTAR *hd;
+ register char *pt;
+ char hdblk[sizeof(HD_USTAR)];
+
+ /*
+ * check for those file system types ustar cannot store
+ */
+ if (arcn->type == PAX_SCK) {
+ warn(1, "Ustar cannot archive a socket %s", arcn->org_name);
+ return(1);
+ }
+
+ /*
+ * check the length of the linkname
+ */
+ if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) ||
+ (arcn->type == PAX_HRG)) && (arcn->ln_nlen > sizeof(hd->linkname))){
+ warn(1, "Link name too long for ustar %s", arcn->ln_name);
+ return(1);
+ }
+
+ /*
+ * 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) {
+ warn(1, "File name too long for ustar %s", arcn->name);
+ return(1);
+ }
+ 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';
+ zf_strncpy(hd->prefix, arcn->name, sizeof(hd->prefix));
+ *pt++ = '/';
+ } else
+ bzero(hd->prefix, sizeof(hd->prefix));
+
+ /*
+ * copy the name part. this may be the whole path or the part after
+ * the prefix
+ */
+ zf_strncpy(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;
+ bzero(hd->linkname, sizeof(hd->linkname));
+ bzero(hd->devmajor, sizeof(hd->devmajor));
+ bzero(hd->devminor, sizeof(hd->devminor));
+ if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
+ goto out;
+ break;
+ case PAX_CHR:
+ case PAX_BLK:
+ if (arcn->type == PAX_CHR)
+ hd->typeflag = CHRTYPE;
+ else
+ hd->typeflag = BLKTYPE;
+ bzero(hd->linkname, sizeof(hd->linkname));
+ if (ul_oct((u_long)MAJOR(arcn->sb.st_rdev), hd->devmajor,
+ sizeof(hd->devmajor), 3) ||
+ ul_oct((u_long)MINOR(arcn->sb.st_rdev), hd->devminor,
+ sizeof(hd->devminor), 3) ||
+ ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
+ goto out;
+ break;
+ case PAX_FIF:
+ hd->typeflag = FIFOTYPE;
+ bzero(hd->linkname, sizeof(hd->linkname));
+ bzero(hd->devmajor, sizeof(hd->devmajor));
+ bzero(hd->devminor, sizeof(hd->devminor));
+ if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
+ goto out;
+ break;
+ case PAX_SLK:
+ case PAX_HLK:
+ case PAX_HRG:
+ if (arcn->type == PAX_SLK)
+ hd->typeflag = SYMTYPE;
+ else
+ hd->typeflag = LNKTYPE;
+ zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname));
+ bzero(hd->devmajor, sizeof(hd->devmajor));
+ bzero(hd->devminor, sizeof(hd->devminor));
+ if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
+ goto out;
+ break;
+ case PAX_REG:
+ case PAX_CTG:
+ default:
+ /*
+ * file data with this type, set the padding
+ */
+ if (arcn->type == PAX_CTG)
+ hd->typeflag = CONTTYPE;
+ else
+ hd->typeflag = REGTYPE;
+ bzero(hd->linkname, sizeof(hd->linkname));
+ bzero(hd->devmajor, sizeof(hd->devmajor));
+ bzero(hd->devminor, sizeof(hd->devminor));
+ arcn->pad = TAR_PAD(arcn->sb.st_size);
+# ifdef NET2_STAT
+ if (ul_oct((u_long)arcn->sb.st_size, hd->size,
+ sizeof(hd->size), 3)) {
+# else
+ if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
+ sizeof(hd->size), 3)) {
+# endif
+ warn(1,"File is too long for ustar %s",arcn->org_name);
+ return(1);
+ }
+ break;
+ }
+
+ zf_strncpy(hd->magic, TMAGIC, TMAGLEN);
+ zf_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 (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3) ||
+ ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3) ||
+ ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3) ||
+ ul_oct((u_long)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3))
+ goto out;
+ zf_strncpy(hd->uname,name_uid(arcn->sb.st_uid, 0),sizeof(hd->uname));
+ zf_strncpy(hd->gname,name_gid(arcn->sb.st_gid, 0),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 (ul_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum,
+ sizeof(hd->chksum), 3))
+ goto out;
+ if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0)
+ return(-1);
+ if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0)
+ return(-1);
+ if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
+ return(0);
+ return(1);
+
+ out:
+ /*
+ * header field is out of range
+ */
+ warn(1, "Ustar header field is too small for %s", arcn->org_name);
+ 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
+ */
+
+#if __STDC__
+static char *
+name_split(register char *name, register int len)
+#else
+static char *
+name_split(name, len)
+ register char *name;
+ register int len;
+#endif
+{
+ register 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);
+ if (len > (TPFSZ + TNMSZ + 1))
+ return(NULL);
+
+ /*
+ * we start looking at the biggest sized piece that fits in the name
+ * field. We walk foward 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 - 1;
+ 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 can not 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);
+}
projects / unix-history / commitdiff