599 lines
15 KiB
C
599 lines
15 KiB
C
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/* $NetBSD: dd.c,v 1.49 2012/02/21 01:49:01 matt Exp $ */
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/*-
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego and Lance
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* Visser of Convex Computer Corporation.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)dd.c 8.5 (Berkeley) 4/2/94";
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#else
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__RCSID("$NetBSD: dd.c,v 1.49 2012/02/21 01:49:01 matt Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/mtio.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "dd.h"
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#include "extern.h"
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static void dd_close(void);
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static void dd_in(void);
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static void getfdtype(IO *);
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static void redup_clean_fd(IO *);
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static void setup(void);
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int main(int, char *[]);
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IO in, out; /* input/output state */
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STAT st; /* statistics */
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void (*cfunc)(void); /* conversion function */
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uint64_t cpy_cnt; /* # of blocks to copy */
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static off_t pending = 0; /* pending seek if sparse */
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u_int ddflags; /* conversion options */
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uint64_t cbsz; /* conversion block size */
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u_int files_cnt = 1; /* # of files to copy */
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uint64_t progress = 0; /* display sign of life */
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const u_char *ctab; /* conversion table */
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sigset_t infoset; /* a set blocking SIGINFO */
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const char *msgfmt = "posix"; /* default summary() message format */
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/*
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* Ops for stdin/stdout and crunch'd dd. These are always host ops.
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*/
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static const struct ddfops ddfops_stdfd = {
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.op_open = open,
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.op_close = close,
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.op_fcntl = fcntl,
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.op_ioctl = ioctl,
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.op_fstat = fstat,
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.op_fsync = fsync,
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.op_ftruncate = ftruncate,
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.op_lseek = lseek,
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.op_read = read,
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.op_write = write,
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};
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extern const struct ddfops ddfops_prog;
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int
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main(int argc, char *argv[])
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{
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int ch;
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setprogname(argv[0]);
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(void)setlocale(LC_ALL, "");
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while ((ch = getopt(argc, argv, "")) != -1) {
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switch (ch) {
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default:
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errx(EXIT_FAILURE, "usage: dd [operand ...]");
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/* NOTREACHED */
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}
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}
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argc -= (optind - 1);
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argv += (optind - 1);
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jcl(argv);
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#ifndef CRUNCHOPS
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if (ddfops_prog.op_init && ddfops_prog.op_init() == -1)
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err(1, "prog init");
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#endif
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setup();
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(void)signal(SIGINFO, summaryx);
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(void)signal(SIGINT, terminate);
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(void)sigemptyset(&infoset);
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(void)sigaddset(&infoset, SIGINFO);
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(void)atexit(summary);
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while (files_cnt--)
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dd_in();
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dd_close();
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exit(0);
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/* NOTREACHED */
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}
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static void
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setup(void)
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{
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#ifdef CRUNCHOPS
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const struct ddfops *prog_ops = &ddfops_stdfd;
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#else
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const struct ddfops *prog_ops = &ddfops_prog;
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#endif
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if (in.name == NULL) {
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in.name = "stdin";
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in.fd = STDIN_FILENO;
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in.ops = &ddfops_stdfd;
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} else {
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in.ops = prog_ops;
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in.fd = ddop_open(in, in.name, O_RDONLY, 0);
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if (in.fd < 0)
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err(EXIT_FAILURE, "%s", in.name);
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/* NOTREACHED */
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/* Ensure in.fd is outside the stdio descriptor range */
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redup_clean_fd(&in);
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}
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getfdtype(&in);
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if (files_cnt > 1 && !(in.flags & ISTAPE)) {
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errx(EXIT_FAILURE, "files is not supported for non-tape devices");
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/* NOTREACHED */
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}
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if (out.name == NULL) {
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/* No way to check for read access here. */
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out.fd = STDOUT_FILENO;
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out.name = "stdout";
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out.ops = &ddfops_stdfd;
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} else {
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out.ops = prog_ops;
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#define OFLAGS \
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(O_CREAT | (ddflags & (C_SEEK | C_NOTRUNC) ? 0 : O_TRUNC))
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out.fd = ddop_open(out, out.name, O_RDWR | OFLAGS, DEFFILEMODE);
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/*
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* May not have read access, so try again with write only.
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* Without read we may have a problem if output also does
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* not support seeks.
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*/
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if (out.fd < 0) {
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out.fd = ddop_open(out, out.name, O_WRONLY | OFLAGS,
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DEFFILEMODE);
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out.flags |= NOREAD;
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}
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if (out.fd < 0) {
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err(EXIT_FAILURE, "%s", out.name);
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/* NOTREACHED */
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}
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/* Ensure out.fd is outside the stdio descriptor range */
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redup_clean_fd(&out);
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}
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getfdtype(&out);
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/*
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* Allocate space for the input and output buffers. If not doing
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* record oriented I/O, only need a single buffer.
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*/
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if (!(ddflags & (C_BLOCK|C_UNBLOCK))) {
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size_t dbsz = out.dbsz;
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if (!(ddflags & C_BS))
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dbsz += in.dbsz - 1;
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if ((in.db = malloc(dbsz)) == NULL) {
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err(EXIT_FAILURE, NULL);
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/* NOTREACHED */
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}
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out.db = in.db;
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} else if ((in.db =
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malloc((u_int)(MAX(in.dbsz, cbsz) + cbsz))) == NULL ||
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(out.db = malloc((u_int)(out.dbsz + cbsz))) == NULL) {
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err(EXIT_FAILURE, NULL);
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/* NOTREACHED */
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}
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in.dbp = in.db;
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out.dbp = out.db;
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/* Position the input/output streams. */
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if (in.offset)
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pos_in();
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if (out.offset)
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pos_out();
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/*
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* Truncate the output file; ignore errors because it fails on some
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* kinds of output files, tapes, for example.
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*/
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if ((ddflags & (C_OF | C_SEEK | C_NOTRUNC)) == (C_OF | C_SEEK))
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(void)ddop_ftruncate(out, out.fd, (off_t)out.offset * out.dbsz);
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/*
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* If converting case at the same time as another conversion, build a
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* table that does both at once. If just converting case, use the
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* built-in tables.
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*/
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if (ddflags & (C_LCASE|C_UCASE)) {
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#ifdef NO_CONV
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/* Should not get here, but just in case... */
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errx(EXIT_FAILURE, "case conv and -DNO_CONV");
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/* NOTREACHED */
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#else /* NO_CONV */
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u_int cnt;
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if (ddflags & C_ASCII || ddflags & C_EBCDIC) {
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if (ddflags & C_LCASE) {
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for (cnt = 0; cnt < 256; ++cnt)
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casetab[cnt] = tolower(ctab[cnt]);
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} else {
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for (cnt = 0; cnt < 256; ++cnt)
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casetab[cnt] = toupper(ctab[cnt]);
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}
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} else {
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if (ddflags & C_LCASE) {
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for (cnt = 0; cnt < 256; ++cnt)
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casetab[cnt] = tolower(cnt);
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} else {
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for (cnt = 0; cnt < 256; ++cnt)
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casetab[cnt] = toupper(cnt);
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}
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}
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ctab = casetab;
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#endif /* NO_CONV */
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}
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(void)gettimeofday(&st.start, NULL); /* Statistics timestamp. */
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}
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static void
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getfdtype(IO *io)
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{
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struct mtget mt;
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struct stat sb;
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if (io->ops->op_fstat(io->fd, &sb)) {
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err(EXIT_FAILURE, "%s", io->name);
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/* NOTREACHED */
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}
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if (S_ISCHR(sb.st_mode))
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io->flags |= io->ops->op_ioctl(io->fd, MTIOCGET, &mt)
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? ISCHR : ISTAPE;
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else if (io->ops->op_lseek(io->fd, (off_t)0, SEEK_CUR) == -1
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&& errno == ESPIPE)
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io->flags |= ISPIPE; /* XXX fixed in 4.4BSD */
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}
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/*
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* Move the parameter file descriptor to a descriptor that is outside the
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* stdio descriptor range, if necessary. This is required to avoid
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* accidentally outputting completion or error messages into the
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* output file that were intended for the tty.
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*/
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static void
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redup_clean_fd(IO *io)
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{
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int fd = io->fd;
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int newfd;
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if (fd != STDIN_FILENO && fd != STDOUT_FILENO &&
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fd != STDERR_FILENO)
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/* File descriptor is ok, return immediately. */
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return;
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/*
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* 3 is the first descriptor greater than STD*_FILENO. Any
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* free descriptor valued 3 or above is acceptable...
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*/
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newfd = io->ops->op_fcntl(fd, F_DUPFD, 3);
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if (newfd < 0) {
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err(EXIT_FAILURE, "dupfd IO");
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/* NOTREACHED */
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}
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io->ops->op_close(fd);
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io->fd = newfd;
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}
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static void
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dd_in(void)
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{
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int flags;
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int64_t n;
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for (flags = ddflags;;) {
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if (cpy_cnt && (st.in_full + st.in_part) >= cpy_cnt)
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return;
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/*
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* Clear the buffer first if doing "sync" on input.
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* If doing block operations use spaces. This will
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* affect not only the C_NOERROR case, but also the
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* last partial input block which should be padded
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* with zero and not garbage.
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*/
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if (flags & C_SYNC) {
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if (flags & (C_BLOCK|C_UNBLOCK))
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(void)memset(in.dbp, ' ', in.dbsz);
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else
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(void)memset(in.dbp, 0, in.dbsz);
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}
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n = ddop_read(in, in.fd, in.dbp, in.dbsz);
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if (n == 0) {
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in.dbrcnt = 0;
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return;
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}
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/* Read error. */
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if (n < 0) {
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/*
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* If noerror not specified, die. POSIX requires that
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* the warning message be followed by an I/O display.
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*/
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if (!(flags & C_NOERROR)) {
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err(EXIT_FAILURE, "%s", in.name);
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/* NOTREACHED */
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}
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warn("%s", in.name);
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summary();
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/*
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* If it's not a tape drive or a pipe, seek past the
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* error. If your OS doesn't do the right thing for
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* raw disks this section should be modified to re-read
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* in sector size chunks.
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*/
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if (!(in.flags & (ISPIPE|ISTAPE)) &&
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ddop_lseek(in, in.fd, (off_t)in.dbsz, SEEK_CUR))
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warn("%s", in.name);
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/* If sync not specified, omit block and continue. */
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if (!(ddflags & C_SYNC))
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continue;
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/* Read errors count as full blocks. */
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in.dbcnt += in.dbrcnt = in.dbsz;
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++st.in_full;
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/* Handle full input blocks. */
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} else if ((uint64_t)n == in.dbsz) {
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in.dbcnt += in.dbrcnt = n;
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++st.in_full;
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/* Handle partial input blocks. */
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} else {
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/* If sync, use the entire block. */
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if (ddflags & C_SYNC)
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in.dbcnt += in.dbrcnt = in.dbsz;
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else
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in.dbcnt += in.dbrcnt = n;
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++st.in_part;
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}
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/*
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* POSIX states that if bs is set and no other conversions
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* than noerror, notrunc or sync are specified, the block
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* is output without buffering as it is read.
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*/
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if (ddflags & C_BS) {
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out.dbcnt = in.dbcnt;
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dd_out(1);
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in.dbcnt = 0;
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continue;
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}
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if (ddflags & C_SWAB) {
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if ((n = in.dbrcnt) & 1) {
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++st.swab;
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--n;
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}
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swab(in.dbp, in.dbp, n);
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}
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in.dbp += in.dbrcnt;
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(*cfunc)();
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}
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}
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/*
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* Cleanup any remaining I/O and flush output. If necessary, output file
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* is truncated.
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||
|
*/
|
||
|
static void
|
||
|
dd_close(void)
|
||
|
{
|
||
|
|
||
|
if (cfunc == def)
|
||
|
def_close();
|
||
|
else if (cfunc == block)
|
||
|
block_close();
|
||
|
else if (cfunc == unblock)
|
||
|
unblock_close();
|
||
|
if (ddflags & C_OSYNC && out.dbcnt < out.dbsz) {
|
||
|
(void)memset(out.dbp, 0, out.dbsz - out.dbcnt);
|
||
|
out.dbcnt = out.dbsz;
|
||
|
}
|
||
|
/* If there are pending sparse blocks, make sure
|
||
|
* to write out the final block un-sparse
|
||
|
*/
|
||
|
if ((out.dbcnt == 0) && pending) {
|
||
|
memset(out.db, 0, out.dbsz);
|
||
|
out.dbcnt = out.dbsz;
|
||
|
out.dbp = out.db + out.dbcnt;
|
||
|
pending -= out.dbsz;
|
||
|
}
|
||
|
if (out.dbcnt)
|
||
|
dd_out(1);
|
||
|
|
||
|
/*
|
||
|
* Reporting nfs write error may be deferred until next
|
||
|
* write(2) or close(2) system call. So, we need to do an
|
||
|
* extra check. If an output is stdout, the file structure
|
||
|
* may be shared with other processes and close(2) just
|
||
|
* decreases the reference count.
|
||
|
*/
|
||
|
if (out.fd == STDOUT_FILENO && ddop_fsync(out, out.fd) == -1
|
||
|
&& errno != EINVAL) {
|
||
|
err(EXIT_FAILURE, "fsync stdout");
|
||
|
/* NOTREACHED */
|
||
|
}
|
||
|
if (ddop_close(out, out.fd) == -1) {
|
||
|
err(EXIT_FAILURE, "close");
|
||
|
/* NOTREACHED */
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void
|
||
|
dd_out(int force)
|
||
|
{
|
||
|
static int warned;
|
||
|
int64_t cnt, n, nw;
|
||
|
u_char *outp;
|
||
|
|
||
|
/*
|
||
|
* Write one or more blocks out. The common case is writing a full
|
||
|
* output block in a single write; increment the full block stats.
|
||
|
* Otherwise, we're into partial block writes. If a partial write,
|
||
|
* and it's a character device, just warn. If a tape device, quit.
|
||
|
*
|
||
|
* The partial writes represent two cases. 1: Where the input block
|
||
|
* was less than expected so the output block was less than expected.
|
||
|
* 2: Where the input block was the right size but we were forced to
|
||
|
* write the block in multiple chunks. The original versions of dd(1)
|
||
|
* never wrote a block in more than a single write, so the latter case
|
||
|
* never happened.
|
||
|
*
|
||
|
* One special case is if we're forced to do the write -- in that case
|
||
|
* we play games with the buffer size, and it's usually a partial write.
|
||
|
*/
|
||
|
outp = out.db;
|
||
|
for (n = force ? out.dbcnt : out.dbsz;; n = out.dbsz) {
|
||
|
for (cnt = n;; cnt -= nw) {
|
||
|
|
||
|
if (!force && ddflags & C_SPARSE) {
|
||
|
int sparse, i;
|
||
|
sparse = 1; /* Is buffer sparse? */
|
||
|
for (i = 0; i < cnt; i++)
|
||
|
if (outp[i] != 0) {
|
||
|
sparse = 0;
|
||
|
break;
|
||
|
}
|
||
|
if (sparse) {
|
||
|
pending += cnt;
|
||
|
outp += cnt;
|
||
|
nw = 0;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
if (pending != 0) {
|
||
|
if (ddop_lseek(out,
|
||
|
out.fd, pending, SEEK_CUR) == -1)
|
||
|
err(EXIT_FAILURE, "%s: seek error creating sparse file",
|
||
|
out.name);
|
||
|
}
|
||
|
nw = bwrite(&out, outp, cnt);
|
||
|
if (nw <= 0) {
|
||
|
if (nw == 0)
|
||
|
errx(EXIT_FAILURE,
|
||
|
"%s: end of device", out.name);
|
||
|
/* NOTREACHED */
|
||
|
if (errno != EINTR)
|
||
|
err(EXIT_FAILURE, "%s", out.name);
|
||
|
/* NOTREACHED */
|
||
|
nw = 0;
|
||
|
}
|
||
|
if (pending) {
|
||
|
st.bytes += pending;
|
||
|
st.sparse += pending/out.dbsz;
|
||
|
st.out_full += pending/out.dbsz;
|
||
|
pending = 0;
|
||
|
}
|
||
|
outp += nw;
|
||
|
st.bytes += nw;
|
||
|
if (nw == n) {
|
||
|
if ((uint64_t)n != out.dbsz)
|
||
|
++st.out_part;
|
||
|
else
|
||
|
++st.out_full;
|
||
|
break;
|
||
|
}
|
||
|
++st.out_part;
|
||
|
if (nw == cnt)
|
||
|
break;
|
||
|
if (out.flags & ISCHR && !warned) {
|
||
|
warned = 1;
|
||
|
warnx("%s: short write on character device", out.name);
|
||
|
}
|
||
|
if (out.flags & ISTAPE)
|
||
|
errx(EXIT_FAILURE,
|
||
|
"%s: short write on tape device", out.name);
|
||
|
/* NOTREACHED */
|
||
|
|
||
|
}
|
||
|
if ((out.dbcnt -= n) < out.dbsz)
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
/* Reassemble the output block. */
|
||
|
if (out.dbcnt)
|
||
|
(void)memmove(out.db, out.dbp - out.dbcnt, out.dbcnt);
|
||
|
out.dbp = out.db + out.dbcnt;
|
||
|
|
||
|
if (progress && (st.out_full + st.out_part) % progress == 0)
|
||
|
(void)write(STDERR_FILENO, ".", 1);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* A protected against SIGINFO write
|
||
|
*/
|
||
|
ssize_t
|
||
|
bwrite(IO *io, const void *buf, size_t len)
|
||
|
{
|
||
|
sigset_t oset;
|
||
|
ssize_t rv;
|
||
|
int oerrno;
|
||
|
|
||
|
(void)sigprocmask(SIG_BLOCK, &infoset, &oset);
|
||
|
rv = io->ops->op_write(io->fd, buf, len);
|
||
|
oerrno = errno;
|
||
|
(void)sigprocmask(SIG_SETMASK, &oset, NULL);
|
||
|
errno = oerrno;
|
||
|
return (rv);
|
||
|
}
|