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-rw-r--r--archivers/libarchive/files/tar/util.c559
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diff --git a/archivers/libarchive/files/tar/util.c b/archivers/libarchive/files/tar/util.c
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index 00000000000..f7232744ec0
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+++ b/archivers/libarchive/files/tar/util.c
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+/*-
+ * Copyright (c) 2003-2007 Tim Kientzle
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "bsdtar_platform.h"
+__FBSDID("$FreeBSD: src/usr.bin/tar/util.c,v 1.23 2008/12/15 06:00:25 kientzle Exp $");
+
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h> /* Linux doesn't define mode_t, etc. in sys/stat.h. */
+#endif
+#include <ctype.h>
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#ifdef HAVE_IO_H
+#include <io.h>
+#endif
+#ifdef HAVE_STDARG_H
+#include <stdarg.h>
+#endif
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#endif
+#include <stdio.h>
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#ifdef HAVE_WCTYPE_H
+#include <wctype.h>
+#else
+/* If we don't have wctype, we need to hack up some version of iswprint(). */
+#define iswprint isprint
+#endif
+
+#include "bsdtar.h"
+#include "err.h"
+
+static size_t bsdtar_expand_char(char *, size_t, char);
+static const char *strip_components(const char *path, int elements);
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#define read _read
+#endif
+
+/* TODO: Hack up a version of mbtowc for platforms with no wide
+ * character support at all. I think the following might suffice,
+ * but it needs careful testing.
+ * #if !HAVE_MBTOWC
+ * #define mbtowc(wcp, p, n) ((*wcp = *p), 1)
+ * #endif
+ */
+
+/*
+ * Print a string, taking care with any non-printable characters.
+ *
+ * Note that we use a stack-allocated buffer to receive the formatted
+ * string if we can. This is partly performance (avoiding a call to
+ * malloc()), partly out of expedience (we have to call vsnprintf()
+ * before malloc() anyway to find out how big a buffer we need; we may
+ * as well point that first call at a small local buffer in case it
+ * works), but mostly for safety (so we can use this to print messages
+ * about out-of-memory conditions).
+ */
+
+void
+safe_fprintf(FILE *f, const char *fmt, ...)
+{
+ char fmtbuff_stack[256]; /* Place to format the printf() string. */
+ char outbuff[256]; /* Buffer for outgoing characters. */
+ char *fmtbuff_heap; /* If fmtbuff_stack is too small, we use malloc */
+ char *fmtbuff; /* Pointer to fmtbuff_stack or fmtbuff_heap. */
+ int fmtbuff_length;
+ int length, n;
+ va_list ap;
+ const char *p;
+ unsigned i;
+ wchar_t wc;
+ char try_wc;
+
+ /* Use a stack-allocated buffer if we can, for speed and safety. */
+ fmtbuff_heap = NULL;
+ fmtbuff_length = sizeof(fmtbuff_stack);
+ fmtbuff = fmtbuff_stack;
+
+ /* Try formatting into the stack buffer. */
+ va_start(ap, fmt);
+ length = vsnprintf(fmtbuff, fmtbuff_length, fmt, ap);
+ va_end(ap);
+
+ /* If the result was too large, allocate a buffer on the heap. */
+ if (length >= fmtbuff_length) {
+ fmtbuff_length = length+1;
+ fmtbuff_heap = malloc(fmtbuff_length);
+
+ /* Reformat the result into the heap buffer if we can. */
+ if (fmtbuff_heap != NULL) {
+ fmtbuff = fmtbuff_heap;
+ va_start(ap, fmt);
+ length = vsnprintf(fmtbuff, fmtbuff_length, fmt, ap);
+ va_end(ap);
+ } else {
+ /* Leave fmtbuff pointing to the truncated
+ * string in fmtbuff_stack. */
+ length = sizeof(fmtbuff_stack) - 1;
+ }
+ }
+
+ /* Note: mbrtowc() has a cleaner API, but mbtowc() seems a bit
+ * more portable, so we use that here instead. */
+ n = mbtowc(NULL, NULL, 1); /* Reset the shift state. */
+
+ /* Write data, expanding unprintable characters. */
+ p = fmtbuff;
+ i = 0;
+ try_wc = 1;
+ while (*p != '\0') {
+
+ /* Convert to wide char, test if the wide
+ * char is printable in the current locale. */
+ if (try_wc && (n = mbtowc(&wc, p, length)) != -1) {
+ length -= n;
+ if (iswprint(wc) && wc != L'\\') {
+ /* Printable, copy the bytes through. */
+ while (n-- > 0)
+ outbuff[i++] = *p++;
+ } else {
+ /* Not printable, format the bytes. */
+ while (n-- > 0)
+ i += (unsigned)bsdtar_expand_char(
+ outbuff, i, *p++);
+ }
+ } else {
+ /* After any conversion failure, don't bother
+ * trying to convert the rest. */
+ i += (unsigned)bsdtar_expand_char(outbuff, i, *p++);
+ try_wc = 0;
+ }
+
+ /* If our output buffer is full, dump it and keep going. */
+ if (i > (sizeof(outbuff) - 20)) {
+ outbuff[i] = '\0';
+ fprintf(f, "%s", outbuff);
+ i = 0;
+ }
+ }
+ outbuff[i] = '\0';
+ fprintf(f, "%s", outbuff);
+
+ /* If we allocated a heap-based formatting buffer, free it now. */
+ if (fmtbuff_heap != NULL)
+ free(fmtbuff_heap);
+}
+
+/*
+ * Render an arbitrary sequence of bytes into printable ASCII characters.
+ */
+static size_t
+bsdtar_expand_char(char *buff, size_t offset, char c)
+{
+ size_t i = offset;
+
+ if (isprint((unsigned char)c) && c != '\\')
+ buff[i++] = c;
+ else {
+ buff[i++] = '\\';
+ switch (c) {
+ case '\a': buff[i++] = 'a'; break;
+ case '\b': buff[i++] = 'b'; break;
+ case '\f': buff[i++] = 'f'; break;
+ case '\n': buff[i++] = 'n'; break;
+#if '\r' != '\n'
+ /* On some platforms, \n and \r are the same. */
+ case '\r': buff[i++] = 'r'; break;
+#endif
+ case '\t': buff[i++] = 't'; break;
+ case '\v': buff[i++] = 'v'; break;
+ case '\\': buff[i++] = '\\'; break;
+ default:
+ sprintf(buff + i, "%03o", 0xFF & (int)c);
+ i += 3;
+ }
+ }
+
+ return (i - offset);
+}
+
+int
+yes(const char *fmt, ...)
+{
+ char buff[32];
+ char *p;
+ ssize_t l;
+
+ va_list ap;
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ fprintf(stderr, " (y/N)? ");
+ fflush(stderr);
+
+ l = read(2, buff, sizeof(buff) - 1);
+ if (l <= 0)
+ return (0);
+ buff[l] = 0;
+
+ for (p = buff; *p != '\0'; p++) {
+ if (isspace((unsigned char)*p))
+ continue;
+ switch(*p) {
+ case 'y': case 'Y':
+ return (1);
+ case 'n': case 'N':
+ return (0);
+ default:
+ return (0);
+ }
+ }
+
+ return (0);
+}
+
+/*-
+ * The logic here for -C <dir> attempts to avoid
+ * chdir() as long as possible. For example:
+ * "-C /foo -C /bar file" needs chdir("/bar") but not chdir("/foo")
+ * "-C /foo -C bar file" needs chdir("/foo/bar")
+ * "-C /foo -C bar /file1" does not need chdir()
+ * "-C /foo -C bar /file1 file2" needs chdir("/foo/bar") before file2
+ *
+ * The only correct way to handle this is to record a "pending" chdir
+ * request and combine multiple requests intelligently until we
+ * need to process a non-absolute file. set_chdir() adds the new dir
+ * to the pending list; do_chdir() actually executes any pending chdir.
+ *
+ * This way, programs that build tar command lines don't have to worry
+ * about -C with non-existent directories; such requests will only
+ * fail if the directory must be accessed.
+ *
+ * TODO: Make this handle Windows paths correctly.
+ */
+void
+set_chdir(struct bsdtar *bsdtar, const char *newdir)
+{
+ if (newdir[0] == '/') {
+ /* The -C /foo -C /bar case; dump first one. */
+ free(bsdtar->pending_chdir);
+ bsdtar->pending_chdir = NULL;
+ }
+ if (bsdtar->pending_chdir == NULL)
+ /* Easy case: no previously-saved dir. */
+ bsdtar->pending_chdir = strdup(newdir);
+ else {
+ /* The -C /foo -C bar case; concatenate */
+ char *old_pending = bsdtar->pending_chdir;
+ size_t old_len = strlen(old_pending);
+ bsdtar->pending_chdir = malloc(old_len + strlen(newdir) + 2);
+ if (old_pending[old_len - 1] == '/')
+ old_pending[old_len - 1] = '\0';
+ if (bsdtar->pending_chdir != NULL)
+ sprintf(bsdtar->pending_chdir, "%s/%s",
+ old_pending, newdir);
+ free(old_pending);
+ }
+ if (bsdtar->pending_chdir == NULL)
+ lafe_errc(1, errno, "No memory");
+}
+
+void
+do_chdir(struct bsdtar *bsdtar)
+{
+ if (bsdtar->pending_chdir == NULL)
+ return;
+
+ if (chdir(bsdtar->pending_chdir) != 0) {
+ lafe_errc(1, 0, "could not chdir to '%s'\n",
+ bsdtar->pending_chdir);
+ }
+ free(bsdtar->pending_chdir);
+ bsdtar->pending_chdir = NULL;
+}
+
+static const char *
+strip_components(const char *p, int elements)
+{
+ /* Skip as many elements as necessary. */
+ while (elements > 0) {
+ switch (*p++) {
+ case '/':
+#if defined(_WIN32) && !defined(__CYGWIN__)
+ case '\\': /* Support \ path sep on Windows ONLY. */
+#endif
+ elements--;
+ break;
+ case '\0':
+ /* Path is too short, skip it. */
+ return (NULL);
+ }
+ }
+
+ /* Skip any / characters. This handles short paths that have
+ * additional / termination. This also handles the case where
+ * the logic above stops in the middle of a duplicate //
+ * sequence (which would otherwise get converted to an
+ * absolute path). */
+ for (;;) {
+ switch (*p) {
+ case '/':
+#if defined(_WIN32) && !defined(__CYGWIN__)
+ case '\\': /* Support \ path sep on Windows ONLY. */
+#endif
+ ++p;
+ break;
+ case '\0':
+ return (NULL);
+ default:
+ return (p);
+ }
+ }
+}
+
+/*
+ * Handle --strip-components and any future path-rewriting options.
+ * Returns non-zero if the pathname should not be extracted.
+ *
+ * TODO: Support pax-style regex path rewrites.
+ */
+int
+edit_pathname(struct bsdtar *bsdtar, struct archive_entry *entry)
+{
+ const char *name = archive_entry_pathname(entry);
+#if HAVE_REGEX_H
+ char *subst_name;
+ int r;
+#endif
+
+#if HAVE_REGEX_H
+ r = apply_substitution(bsdtar, name, &subst_name, 0);
+ if (r == -1) {
+ lafe_warnc(0, "Invalid substitution, skipping entry");
+ return 1;
+ }
+ if (r == 1) {
+ archive_entry_copy_pathname(entry, subst_name);
+ if (*subst_name == '\0') {
+ free(subst_name);
+ return -1;
+ } else
+ free(subst_name);
+ name = archive_entry_pathname(entry);
+ }
+
+ if (archive_entry_hardlink(entry)) {
+ r = apply_substitution(bsdtar, archive_entry_hardlink(entry), &subst_name, 1);
+ if (r == -1) {
+ lafe_warnc(0, "Invalid substitution, skipping entry");
+ return 1;
+ }
+ if (r == 1) {
+ archive_entry_copy_hardlink(entry, subst_name);
+ free(subst_name);
+ }
+ }
+ if (archive_entry_symlink(entry) != NULL) {
+ r = apply_substitution(bsdtar, archive_entry_symlink(entry), &subst_name, 1);
+ if (r == -1) {
+ lafe_warnc(0, "Invalid substitution, skipping entry");
+ return 1;
+ }
+ if (r == 1) {
+ archive_entry_copy_symlink(entry, subst_name);
+ free(subst_name);
+ }
+ }
+#endif
+
+ /* Strip leading dir names as per --strip-components option. */
+ if (bsdtar->strip_components > 0) {
+ const char *linkname = archive_entry_hardlink(entry);
+
+ name = strip_components(name, bsdtar->strip_components);
+ if (name == NULL)
+ return (1);
+
+ if (linkname != NULL) {
+ linkname = strip_components(linkname,
+ bsdtar->strip_components);
+ if (linkname == NULL)
+ return (1);
+ archive_entry_copy_hardlink(entry, linkname);
+ }
+ }
+
+ /* By default, don't write or restore absolute pathnames. */
+ if (!bsdtar->option_absolute_paths) {
+ const char *rp, *p = name;
+ int slashonly = 1;
+
+ /* Remove leading "//./" or "//?/" or "//?/UNC/"
+ * (absolute path prefixes used by Windows API) */
+ if ((p[0] == '/' || p[0] == '\\') &&
+ (p[1] == '/' || p[1] == '\\') &&
+ (p[2] == '.' || p[2] == '?') &&
+ (p[3] == '/' || p[3] == '\\'))
+ {
+ if (p[2] == '?' &&
+ (p[4] == 'U' || p[4] == 'u') &&
+ (p[5] == 'N' || p[5] == 'n') &&
+ (p[6] == 'C' || p[6] == 'c') &&
+ (p[7] == '/' || p[7] == '\\'))
+ p += 8;
+ else
+ p += 4;
+ slashonly = 0;
+ }
+ do {
+ rp = p;
+ /* Remove leading drive letter from archives created
+ * on Windows. */
+ if (((p[0] >= 'a' && p[0] <= 'z') ||
+ (p[0] >= 'A' && p[0] <= 'Z')) &&
+ p[1] == ':') {
+ p += 2;
+ slashonly = 0;
+ }
+ /* Remove leading "/../", "//", etc. */
+ while (p[0] == '/' || p[0] == '\\') {
+ if (p[1] == '.' && p[2] == '.' &&
+ (p[3] == '/' || p[3] == '\\')) {
+ p += 3; /* Remove "/..", leave "/"
+ * for next pass. */
+ slashonly = 0;
+ } else
+ p += 1; /* Remove "/". */
+ }
+ } while (rp != p);
+
+ if (p != name && !bsdtar->warned_lead_slash) {
+ /* Generate a warning the first time this happens. */
+ if (slashonly)
+ lafe_warnc(0,
+ "Removing leading '%c' from member names",
+ name[0]);
+ else
+ lafe_warnc(0,
+ "Removing leading drive letter from "
+ "member names");
+ bsdtar->warned_lead_slash = 1;
+ }
+
+ /* Special case: Stripping everything yields ".". */
+ if (*p == '\0')
+ name = ".";
+ else
+ name = p;
+ } else {
+ /* Strip redundant leading '/' characters. */
+ while (name[0] == '/' && name[1] == '/')
+ name++;
+ }
+
+ /* Safely replace name in archive_entry. */
+ if (name != archive_entry_pathname(entry)) {
+ char *q = strdup(name);
+ archive_entry_copy_pathname(entry, q);
+ free(q);
+ }
+ return (0);
+}
+
+/*
+ * It would be nice to just use printf() for formatting large numbers,
+ * but the compatibility problems are quite a headache. Hence the
+ * following simple utility function.
+ */
+const char *
+tar_i64toa(int64_t n0)
+{
+ static char buff[24];
+ int64_t n = n0 < 0 ? -n0 : n0;
+ char *p = buff + sizeof(buff);
+
+ *--p = '\0';
+ do {
+ *--p = '0' + (int)(n % 10);
+ n /= 10;
+ } while (n > 0);
+ if (n0 < 0)
+ *--p = '-';
+ return p;
+}
+
+/*
+ * Like strcmp(), but try to be a little more aware of the fact that
+ * we're comparing two paths. Right now, it just handles leading
+ * "./" and trailing '/' specially, so that "a/b/" == "./a/b"
+ *
+ * TODO: Make this better, so that "./a//b/./c/" == "a/b/c"
+ * TODO: After this works, push it down into libarchive.
+ * TODO: Publish the path normalization routines in libarchive so
+ * that bsdtar can normalize paths and use fast strcmp() instead
+ * of this.
+ *
+ * Note: This is currently only used within write.c, so should
+ * not handle \ path separators.
+ */
+
+int
+pathcmp(const char *a, const char *b)
+{
+ /* Skip leading './' */
+ if (a[0] == '.' && a[1] == '/' && a[2] != '\0')
+ a += 2;
+ if (b[0] == '.' && b[1] == '/' && b[2] != '\0')
+ b += 2;
+ /* Find the first difference, or return (0) if none. */
+ while (*a == *b) {
+ if (*a == '\0')
+ return (0);
+ a++;
+ b++;
+ }
+ /*
+ * If one ends in '/' and the other one doesn't,
+ * they're the same.
+ */
+ if (a[0] == '/' && a[1] == '\0' && b[0] == '\0')
+ return (0);
+ if (a[0] == '\0' && b[0] == '/' && b[1] == '\0')
+ return (0);
+ /* They're really different, return the correct sign. */
+ return (*(const unsigned char *)a - *(const unsigned char *)b);
+}
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