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/* $OpenBSD: dd.c,v 1.23 2015/10/09 01:37:06 deraadt Exp $ */ |
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/* $NetBSD: dd.c,v 1.6 1996/02/20 19:29:06 jtc 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/types.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 <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 <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 setup(void); |
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#define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b)) |
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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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size_t cpy_cnt; /* # of blocks to copy */ |
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u_int ddflags; /* conversion options */ |
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size_t cbsz; /* conversion block size */ |
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size_t files_cnt = 1; /* # of files to copy */ |
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const u_char *ctab; /* conversion table */ |
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int |
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main(int argc, char *argv[]) |
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{ |
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jcl(argv); |
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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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atexit(summary); |
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if (cpy_cnt != (size_t)-1) { |
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while (files_cnt--) |
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dd_in(); |
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} |
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dd_close(); |
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exit(0); |
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} |
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static void |
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setup(void) |
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{ |
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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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} else { |
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in.fd = open(in.name, O_RDONLY, 0); |
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if (in.fd < 0) |
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err(1, "%s", in.name); |
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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(1, "files is not supported for non-tape devices"); |
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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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} else { |
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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 = open(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 = open(out.name, O_WRONLY | OFLAGS, 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(1, "%s", out.name); |
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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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if ((in.db = malloc(out.dbsz + in.dbsz - 1)) == NULL) |
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err(1, "input buffer"); |
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out.db = in.db; |
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} else if ((in.db = |
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malloc((u_int)(MAXIMUM(in.dbsz, cbsz) + cbsz))) == NULL || |
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(out.db = malloc((u_int)(out.dbsz + cbsz))) == NULL) |
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err(1, "output buffer"); |
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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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if (pledge("stdio wpath cpath rpath", NULL) == -1) |
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err(1, "pledge"); |
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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)ftruncate(out.fd, 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(1, "case conv and -DNO_CONV"); |
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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 < 0377; ++cnt) |
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casetab[cnt] = tolower(ctab[cnt]); |
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} else { |
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for (cnt = 0; cnt < 0377; ++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 < 0377; ++cnt) |
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casetab[cnt] = tolower(cnt); |
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} else { |
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for (cnt = 0; cnt < 0377; ++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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/* Statistics timestamp. */ |
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(void)gettimeofday(&st.startv, (struct timezone *)NULL); |
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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 (fstat(io->fd, &sb)) |
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err(1, "%s", io->name); |
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if (S_ISCHR(sb.st_mode)) |
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io->flags |= ioctl(io->fd, MTIOCGET, &mt) ? ISCHR : ISTAPE; |
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if (S_ISFIFO(sb.st_mode) || S_ISSOCK(sb.st_mode)) |
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io->flags |= ISPIPE; |
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} |
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static void |
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swapbytes(void *v, size_t len) |
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{ |
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unsigned char *p = v; |
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unsigned char t; |
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while (len > 1) { |
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t = p[0]; |
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p[0] = p[1]; |
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p[1] = t; |
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p += 2; |
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len -= 2; |
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} |
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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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ssize_t n; |
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for (;;) { |
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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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* Zero the buffer first if sync; if doing block operations |
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* use spaces. |
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*/ |
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if (ddflags & C_SYNC) { |
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if (ddflags & (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 = read(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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} |
254 |
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255 |
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/* Read error. */ |
256 |
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if (n < 0) { |
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/* |
258 |
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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 (!(ddflags & C_NOERROR)) |
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err(1, "%s", in.name); |
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warn("%s", in.name); |
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summary(); |
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/* |
267 |
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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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lseek(in.fd, (off_t)in.dbsz, SEEK_CUR)) |
274 |
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warn("%s", in.name); |
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276 |
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/* If sync not specified, omit block and continue. */ |
277 |
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if (!(ddflags & C_SYNC)) |
278 |
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continue; |
279 |
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280 |
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/* Read errors count as full blocks. */ |
281 |
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in.dbcnt += in.dbrcnt = in.dbsz; |
282 |
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++st.in_full; |
283 |
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284 |
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/* Handle full input blocks. */ |
285 |
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} else if (n == in.dbsz) { |
286 |
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in.dbcnt += in.dbrcnt = n; |
287 |
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++st.in_full; |
288 |
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289 |
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/* Handle partial input blocks. */ |
290 |
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} else { |
291 |
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/* If sync, use the entire block. */ |
292 |
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if (ddflags & C_SYNC) |
293 |
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in.dbcnt += in.dbrcnt = in.dbsz; |
294 |
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else |
295 |
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in.dbcnt += in.dbrcnt = n; |
296 |
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++st.in_part; |
297 |
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} |
298 |
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299 |
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/* |
300 |
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* POSIX states that if bs is set and no other conversions |
301 |
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* than noerror, notrunc or sync are specified, the block |
302 |
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* is output without buffering as it is read. |
303 |
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*/ |
304 |
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if (ddflags & C_BS) { |
305 |
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out.dbcnt = in.dbcnt; |
306 |
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dd_out(1); |
307 |
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in.dbcnt = 0; |
308 |
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continue; |
309 |
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} |
310 |
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|
311 |
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if (ddflags & C_SWAB) { |
312 |
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if ((n = in.dbrcnt) & 1) { |
313 |
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++st.swab; |
314 |
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--n; |
315 |
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} |
316 |
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swapbytes(in.dbp, n); |
317 |
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} |
318 |
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319 |
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in.dbp += in.dbrcnt; |
320 |
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(*cfunc)(); |
321 |
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} |
322 |
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} |
323 |
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324 |
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/* |
325 |
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* Cleanup any remaining I/O and flush output. If necessary, output file |
326 |
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* is truncated. |
327 |
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*/ |
328 |
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static void |
329 |
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dd_close(void) |
330 |
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{ |
331 |
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if (cfunc == def) |
332 |
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def_close(); |
333 |
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else if (cfunc == block) |
334 |
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block_close(); |
335 |
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else if (cfunc == unblock) |
336 |
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unblock_close(); |
337 |
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if (ddflags & C_OSYNC && out.dbcnt && out.dbcnt < out.dbsz) { |
338 |
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if (ddflags & (C_BLOCK|C_UNBLOCK)) |
339 |
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memset(out.dbp, ' ', out.dbsz - out.dbcnt); |
340 |
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else |
341 |
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memset(out.dbp, 0, out.dbsz - out.dbcnt); |
342 |
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out.dbcnt = out.dbsz; |
343 |
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} |
344 |
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if (out.dbcnt) |
345 |
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dd_out(1); |
346 |
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} |
347 |
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|
348 |
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void |
349 |
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dd_out(int force) |
350 |
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{ |
351 |
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static int warned; |
352 |
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size_t cnt, n; |
353 |
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ssize_t nw; |
354 |
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u_char *outp; |
355 |
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|
356 |
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/* |
357 |
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* Write one or more blocks out. The common case is writing a full |
358 |
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* output block in a single write; increment the full block stats. |
359 |
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* Otherwise, we're into partial block writes. If a partial write, |
360 |
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* and it's a character device, just warn. If a tape device, quit. |
361 |
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* |
362 |
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* The partial writes represent two cases. 1: Where the input block |
363 |
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* was less than expected so the output block was less than expected. |
364 |
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* 2: Where the input block was the right size but we were forced to |
365 |
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* write the block in multiple chunks. The original versions of dd(1) |
366 |
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* never wrote a block in more than a single write, so the latter case |
367 |
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* never happened. |
368 |
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* |
369 |
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* One special case is if we're forced to do the write -- in that case |
370 |
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* we play games with the buffer size, and it's usually a partial write. |
371 |
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*/ |
372 |
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outp = out.db; |
373 |
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for (n = force ? out.dbcnt : out.dbsz;; n = out.dbsz) { |
374 |
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for (cnt = n;; cnt -= nw) { |
375 |
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nw = write(out.fd, outp, cnt); |
376 |
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if (nw <= 0) { |
377 |
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if (nw == 0) |
378 |
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errx(1, "%s: end of device", out.name); |
379 |
|
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if (errno != EINTR) |
380 |
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err(1, "%s", out.name); |
381 |
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nw = 0; |
382 |
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} |
383 |
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outp += nw; |
384 |
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st.bytes += nw; |
385 |
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if (nw == n) { |
386 |
|
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if (n != out.dbsz) |
387 |
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++st.out_part; |
388 |
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else |
389 |
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++st.out_full; |
390 |
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break; |
391 |
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} |
392 |
|
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++st.out_part; |
393 |
|
|
if (nw == cnt) |
394 |
|
|
break; |
395 |
|
|
if (out.flags & ISCHR && !warned) { |
396 |
|
|
warned = 1; |
397 |
|
|
warnx("%s: short write on character device", |
398 |
|
|
out.name); |
399 |
|
|
} |
400 |
|
|
if (out.flags & ISTAPE) |
401 |
|
|
errx(1, "%s: short write on tape device", out.name); |
402 |
|
|
} |
403 |
|
|
if ((out.dbcnt -= n) < out.dbsz) |
404 |
|
|
break; |
405 |
|
|
} |
406 |
|
|
|
407 |
|
|
/* Reassemble the output block. */ |
408 |
|
|
if (out.dbcnt) |
409 |
|
|
(void)memmove(out.db, out.dbp - out.dbcnt, out.dbcnt); |
410 |
|
|
out.dbp = out.db + out.dbcnt; |
411 |
|
|
} |