488 lines
13 KiB
C
488 lines
13 KiB
C
/*-
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* Copyright (c) 2003-2007 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "bsdtar_platform.h"
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__FBSDID("$FreeBSD: src/usr.bin/tar/util.c,v 1.18 2008/01/02 00:21:27 kientzle Exp $");
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h> /* Linux doesn't define mode_t, etc. in sys/stat.h. */
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#endif
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#include <ctype.h>
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_STDARG_H
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#include <stdarg.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "bsdtar.h"
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static void bsdtar_vwarnc(struct bsdtar *, int code,
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const char *fmt, va_list ap);
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/*
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* Print a string, taking care with any non-printable characters.
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*/
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void
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safe_fprintf(FILE *f, const char *fmt, ...)
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{
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char *buff;
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char *buff_heap;
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int buff_length;
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int length;
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va_list ap;
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char *p;
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unsigned i;
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char buff_stack[256];
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char copy_buff[256];
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/* Use a stack-allocated buffer if we can, for speed and safety. */
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buff_heap = NULL;
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buff_length = sizeof(buff_stack);
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buff = buff_stack;
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va_start(ap, fmt);
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length = vsnprintf(buff, buff_length, fmt, ap);
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va_end(ap);
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/* If the result is too large, allocate a buffer on the heap. */
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if (length >= buff_length) {
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buff_length = length+1;
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buff_heap = malloc(buff_length);
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/* Failsafe: use the truncated string if malloc fails. */
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if (buff_heap != NULL) {
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buff = buff_heap;
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va_start(ap, fmt);
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length = vsnprintf(buff, buff_length, fmt, ap);
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va_end(ap);
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}
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}
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/* Write data, expanding unprintable characters. */
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p = buff;
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i = 0;
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while (*p != '\0') {
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unsigned char c = *p++;
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if (isprint(c) && c != '\\')
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copy_buff[i++] = c;
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else {
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copy_buff[i++] = '\\';
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switch (c) {
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case '\a': copy_buff[i++] = 'a'; break;
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case '\b': copy_buff[i++] = 'b'; break;
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case '\f': copy_buff[i++] = 'f'; break;
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case '\n': copy_buff[i++] = 'n'; break;
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#if '\r' != '\n'
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/* On some platforms, \n and \r are the same. */
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case '\r': copy_buff[i++] = 'r'; break;
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#endif
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case '\t': copy_buff[i++] = 't'; break;
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case '\v': copy_buff[i++] = 'v'; break;
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case '\\': copy_buff[i++] = '\\'; break;
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default:
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sprintf(copy_buff + i, "%03o", c);
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i += 3;
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}
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}
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/* If our temp buffer is full, dump it and keep going. */
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if (i > (sizeof(copy_buff) - 8)) {
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copy_buff[i++] = '\0';
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fprintf(f, "%s", copy_buff);
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i = 0;
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}
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}
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copy_buff[i++] = '\0';
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fprintf(f, "%s", copy_buff);
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/* If we allocated a heap-based buffer, free it now. */
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if (buff_heap != NULL)
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free(buff_heap);
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}
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static void
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bsdtar_vwarnc(struct bsdtar *bsdtar, int code, const char *fmt, va_list ap)
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{
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fprintf(stderr, "%s: ", bsdtar->progname);
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vfprintf(stderr, fmt, ap);
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if (code != 0)
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fprintf(stderr, ": %s", strerror(code));
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fprintf(stderr, "\n");
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}
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void
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bsdtar_warnc(struct bsdtar *bsdtar, int code, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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bsdtar_vwarnc(bsdtar, code, fmt, ap);
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va_end(ap);
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}
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void
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bsdtar_errc(struct bsdtar *bsdtar, int eval, int code, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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bsdtar_vwarnc(bsdtar, code, fmt, ap);
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va_end(ap);
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exit(eval);
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}
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int
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yes(const char *fmt, ...)
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{
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char buff[32];
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char *p;
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ssize_t l;
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fprintf(stderr, " (y/N)? ");
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fflush(stderr);
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l = read(2, buff, sizeof(buff) - 1);
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if (l <= 0)
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return (0);
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buff[l] = 0;
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for (p = buff; *p != '\0'; p++) {
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if (isspace(0xff & (int)*p))
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continue;
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switch(*p) {
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case 'y': case 'Y':
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return (1);
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case 'n': case 'N':
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return (0);
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default:
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return (0);
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}
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}
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return (0);
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}
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/*
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* Read lines from file and do something with each one. If option_null
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* is set, lines are terminated with zero bytes; otherwise, they're
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* terminated with newlines.
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*
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* This uses a self-sizing buffer to handle arbitrarily-long lines.
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* If the "process" function returns non-zero for any line, this
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* function will return non-zero after attempting to process all
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* remaining lines.
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*/
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int
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process_lines(struct bsdtar *bsdtar, const char *pathname,
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int (*process)(struct bsdtar *, const char *))
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{
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FILE *f;
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char *buff, *buff_end, *line_start, *line_end, *p;
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size_t buff_length, new_buff_length, bytes_read, bytes_wanted;
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int separator;
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int ret;
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separator = bsdtar->option_null ? '\0' : '\n';
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ret = 0;
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if (strcmp(pathname, "-") == 0)
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f = stdin;
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else
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f = fopen(pathname, "r");
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if (f == NULL)
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bsdtar_errc(bsdtar, 1, errno, "Couldn't open %s", pathname);
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buff_length = 8192;
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buff = malloc(buff_length);
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if (buff == NULL)
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bsdtar_errc(bsdtar, 1, ENOMEM, "Can't read %s", pathname);
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line_start = line_end = buff_end = buff;
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for (;;) {
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/* Get some more data into the buffer. */
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bytes_wanted = buff + buff_length - buff_end;
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bytes_read = fread(buff_end, 1, bytes_wanted, f);
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buff_end += bytes_read;
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/* Process all complete lines in the buffer. */
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while (line_end < buff_end) {
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if (*line_end == separator) {
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*line_end = '\0';
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if ((*process)(bsdtar, line_start) != 0)
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ret = -1;
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line_start = line_end + 1;
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line_end = line_start;
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} else
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line_end++;
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}
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if (feof(f))
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break;
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if (ferror(f))
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bsdtar_errc(bsdtar, 1, errno,
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"Can't read %s", pathname);
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if (line_start > buff) {
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/* Move a leftover fractional line to the beginning. */
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memmove(buff, line_start, buff_end - line_start);
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buff_end -= line_start - buff;
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line_end -= line_start - buff;
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line_start = buff;
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} else {
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/* Line is too big; enlarge the buffer. */
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new_buff_length = buff_length * 2;
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if (new_buff_length <= buff_length)
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bsdtar_errc(bsdtar, 1, ENOMEM,
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"Line too long in %s", pathname);
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buff_length = new_buff_length;
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p = realloc(buff, buff_length);
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if (p == NULL)
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bsdtar_errc(bsdtar, 1, ENOMEM,
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"Line too long in %s", pathname);
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buff_end = p + (buff_end - buff);
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line_end = p + (line_end - buff);
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line_start = buff = p;
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}
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}
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/* At end-of-file, handle the final line. */
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if (line_end > line_start) {
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*line_end = '\0';
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if ((*process)(bsdtar, line_start) != 0)
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ret = -1;
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}
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free(buff);
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if (f != stdin)
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fclose(f);
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return (ret);
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}
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/*-
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* The logic here for -C <dir> attempts to avoid
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* chdir() as long as possible. For example:
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* "-C /foo -C /bar file" needs chdir("/bar") but not chdir("/foo")
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* "-C /foo -C bar file" needs chdir("/foo/bar")
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* "-C /foo -C bar /file1" does not need chdir()
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* "-C /foo -C bar /file1 file2" needs chdir("/foo/bar") before file2
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*
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* The only correct way to handle this is to record a "pending" chdir
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* request and combine multiple requests intelligently until we
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* need to process a non-absolute file. set_chdir() adds the new dir
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* to the pending list; do_chdir() actually executes any pending chdir.
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*
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* This way, programs that build tar command lines don't have to worry
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* about -C with non-existent directories; such requests will only
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* fail if the directory must be accessed.
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*/
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void
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set_chdir(struct bsdtar *bsdtar, const char *newdir)
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{
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if (newdir[0] == '/') {
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/* The -C /foo -C /bar case; dump first one. */
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free(bsdtar->pending_chdir);
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bsdtar->pending_chdir = NULL;
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}
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if (bsdtar->pending_chdir == NULL)
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/* Easy case: no previously-saved dir. */
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bsdtar->pending_chdir = strdup(newdir);
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else {
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/* The -C /foo -C bar case; concatenate */
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char *old_pending = bsdtar->pending_chdir;
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size_t old_len = strlen(old_pending);
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bsdtar->pending_chdir = malloc(old_len + strlen(newdir) + 2);
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if (old_pending[old_len - 1] == '/')
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old_pending[old_len - 1] = '\0';
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if (bsdtar->pending_chdir != NULL)
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sprintf(bsdtar->pending_chdir, "%s/%s",
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old_pending, newdir);
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free(old_pending);
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}
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if (bsdtar->pending_chdir == NULL)
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bsdtar_errc(bsdtar, 1, errno, "No memory");
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}
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void
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do_chdir(struct bsdtar *bsdtar)
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{
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if (bsdtar->pending_chdir == NULL)
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return;
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if (chdir(bsdtar->pending_chdir) != 0) {
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bsdtar_errc(bsdtar, 1, 0, "could not chdir to '%s'\n",
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bsdtar->pending_chdir);
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}
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free(bsdtar->pending_chdir);
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bsdtar->pending_chdir = NULL;
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}
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/*
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* Handle --strip-components and any future path-rewriting options.
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* Returns non-zero if the pathname should not be extracted.
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*
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* TODO: Support pax-style regex path rewrites.
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*/
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int
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edit_pathname(struct bsdtar *bsdtar, struct archive_entry *entry)
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{
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const char *name = archive_entry_pathname(entry);
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#if HAVE_REGEX_H
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char *subst_name;
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#endif
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int r;
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#if HAVE_REGEX_H
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r = apply_substitution(bsdtar, name, &subst_name, 0);
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if (r == -1) {
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bsdtar_warnc(bsdtar, 0, "Invalid substituion, skipping entry");
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return 1;
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}
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if (r == 1) {
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archive_entry_copy_pathname(entry, subst_name);
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free(subst_name);
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if (*subst_name == '\0')
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return -1;
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name = archive_entry_pathname(entry);
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}
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if (archive_entry_hardlink(entry)) {
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r = apply_substitution(bsdtar, archive_entry_hardlink(entry), &subst_name, 1);
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if (r == -1) {
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bsdtar_warnc(bsdtar, 0, "Invalid substituion, skipping entry");
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return 1;
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}
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if (r == 1) {
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archive_entry_copy_hardlink(entry, subst_name);
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free(subst_name);
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}
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}
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if (archive_entry_symlink(entry) != NULL) {
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r = apply_substitution(bsdtar, archive_entry_symlink(entry), &subst_name, 1);
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if (r == -1) {
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bsdtar_warnc(bsdtar, 0, "Invalid substituion, skipping entry");
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return 1;
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}
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if (r == 1) {
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archive_entry_copy_symlink(entry, subst_name);
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free(subst_name);
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}
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}
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#endif
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/* Strip leading dir names as per --strip-components option. */
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if ((r = bsdtar->strip_components) > 0) {
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const char *p = name;
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while (r > 0) {
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switch (*p++) {
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case '/':
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r--;
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name = p;
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break;
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case '\0':
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/* Path is too short, skip it. */
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return (1);
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}
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}
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while (*name == '/')
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++name;
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if (*name == '\0')
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return (1);
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}
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/* Strip redundant leading '/' characters. */
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while (name[0] == '/' && name[1] == '/')
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name++;
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/* Strip leading '/' unless user has asked us not to. */
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if (name[0] == '/' && !bsdtar->option_absolute_paths) {
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/* Generate a warning the first time this happens. */
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if (!bsdtar->warned_lead_slash) {
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bsdtar_warnc(bsdtar, 0,
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"Removing leading '/' from member names");
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bsdtar->warned_lead_slash = 1;
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}
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name++;
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/* Special case: Stripping leading '/' from "/" yields ".". */
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if (*name == '\0')
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name = ".";
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}
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/* Safely replace name in archive_entry. */
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if (name != archive_entry_pathname(entry)) {
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char *q = strdup(name);
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archive_entry_copy_pathname(entry, q);
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free(q);
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}
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return (0);
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}
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/*
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* Like strcmp(), but try to be a little more aware of the fact that
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* we're comparing two paths. Right now, it just handles leading
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* "./" and trailing '/' specially, so that "a/b/" == "./a/b"
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*
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* TODO: Make this better, so that "./a//b/./c/" == "a/b/c"
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* TODO: After this works, push it down into libarchive.
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* TODO: Publish the path normalization routines in libarchive so
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* that bsdtar can normalize paths and use fast strcmp() instead
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* of this.
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*/
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int
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pathcmp(const char *a, const char *b)
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{
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/* Skip leading './' */
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if (a[0] == '.' && a[1] == '/' && a[2] != '\0')
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a += 2;
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if (b[0] == '.' && b[1] == '/' && b[2] != '\0')
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b += 2;
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/* Find the first difference, or return (0) if none. */
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while (*a == *b) {
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if (*a == '\0')
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return (0);
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a++;
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b++;
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}
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/*
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* If one ends in '/' and the other one doesn't,
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* they're the same.
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*/
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if (a[0] == '/' && a[1] == '\0' && b[0] == '\0')
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return (0);
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if (a[0] == '\0' && b[0] == '/' && b[1] == '\0')
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return (0);
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/* They're really different, return the correct sign. */
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return (*(const unsigned char *)a - *(const unsigned char *)b);
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}
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