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freebsd-nq/lib/libarchive/archive_write_set_format_shar.c
Tim Kientzle f81da3e584 libarchive 2.0 
* libarchive_test program exercises many of the core features
  * Refactored old "read_extract" into new "archive_write_disk", which
    uses archive_write methods to put entries onto disk.  In particular,
    you can now use archive_write_disk to create objects on disk
    without having an archive available.
  * Pushed some security checks from bsdtar down into libarchive, where
    they can be better optimized.
  * Rearchitected the logic for creating objects on disk to reduce
    the number of system calls.  Several common cases now use a
    minimum number of system calls.
  * Virtualized some internal interfaces to provide a clearer separation
    of read and write handling and make it simpler to override key
    methods.
  * New "empty" format reader.
  * Corrected return types (this ABI breakage required the "2.0" version bump)
  * Many bug fixes.
2007-03-03 07:37:37 +00:00

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/*-
* Copyright (c) 2003-2007 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "archive_platform.h"
__FBSDID("$FreeBSD$");
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <stdarg.h>
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_write_private.h"
struct shar {
int dump;
int end_of_line;
struct archive_entry *entry;
int has_data;
char *last_dir;
char outbuff[1024];
size_t outbytes;
size_t outpos;
int uuavail;
char uubuffer[3];
int wrote_header;
struct archive_string work;
};
static int archive_write_shar_finish(struct archive_write *);
static int archive_write_shar_destroy(struct archive_write *);
static int archive_write_shar_header(struct archive_write *,
struct archive_entry *);
static ssize_t archive_write_shar_data_sed(struct archive_write *,
const void * buff, size_t);
static ssize_t archive_write_shar_data_uuencode(struct archive_write *,
const void * buff, size_t);
static int archive_write_shar_finish_entry(struct archive_write *);
static int shar_printf(struct archive_write *, const char *fmt, ...);
static void uuencode_group(struct shar *);
static int
shar_printf(struct archive_write *a, const char *fmt, ...)
{
struct shar *shar;
va_list ap;
int ret;
shar = (struct shar *)a->format_data;
va_start(ap, fmt);
archive_string_empty(&(shar->work));
archive_string_vsprintf(&(shar->work), fmt, ap);
ret = ((a->compression_write)(a, shar->work.s, strlen(shar->work.s)));
va_end(ap);
return (ret);
}
/*
* Set output format to 'shar' format.
*/
int
archive_write_set_format_shar(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
struct shar *shar;
/* If someone else was already registered, unregister them. */
if (a->format_destroy != NULL)
(a->format_destroy)(a);
shar = (struct shar *)malloc(sizeof(*shar));
if (shar == NULL) {
archive_set_error(&a->archive, ENOMEM, "Can't allocate shar data");
return (ARCHIVE_FATAL);
}
memset(shar, 0, sizeof(*shar));
a->format_data = shar;
a->pad_uncompressed = 0;
a->format_write_header = archive_write_shar_header;
a->format_finish = archive_write_shar_finish;
a->format_destroy = archive_write_shar_destroy;
a->format_write_data = archive_write_shar_data_sed;
a->format_finish_entry = archive_write_shar_finish_entry;
a->archive_format = ARCHIVE_FORMAT_SHAR_BASE;
a->archive_format_name = "shar";
return (ARCHIVE_OK);
}
/*
* An alternate 'shar' that uses uudecode instead of 'sed' to encode
* file contents and can therefore be used to archive binary files.
* In addition, this variant also attempts to restore ownership, file modes,
* and other extended file information.
*/
int
archive_write_set_format_shar_dump(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
struct shar *shar;
archive_write_set_format_shar(&a->archive);
shar = (struct shar *)a->format_data;
shar->dump = 1;
a->format_write_data = archive_write_shar_data_uuencode;
a->archive_format = ARCHIVE_FORMAT_SHAR_DUMP;
a->archive_format_name = "shar dump";
return (ARCHIVE_OK);
}
static int
archive_write_shar_header(struct archive_write *a, struct archive_entry *entry)
{
const char *linkname;
const char *name;
char *p, *pp;
struct shar *shar;
const struct stat *st;
int ret;
shar = (struct shar *)a->format_data;
if (!shar->wrote_header) {
ret = shar_printf(a, "#!/bin/sh\n");
if (ret != ARCHIVE_OK)
return (ret);
ret = shar_printf(a, "# This is a shell archive\n");
if (ret != ARCHIVE_OK)
return (ret);
shar->wrote_header = 1;
}
/* Save the entry for the closing. */
if (shar->entry)
archive_entry_free(shar->entry);
shar->entry = archive_entry_clone(entry);
name = archive_entry_pathname(entry);
st = archive_entry_stat(entry);
/* Handle some preparatory issues. */
switch(st->st_mode & S_IFMT) {
case S_IFREG:
/* Only regular files have non-zero size. */
break;
case S_IFDIR:
archive_entry_set_size(entry, 0);
/* Don't bother trying to recreate '.' */
if (strcmp(name, ".") == 0 || strcmp(name, "./") == 0)
return (ARCHIVE_OK);
break;
case S_IFIFO:
case S_IFCHR:
case S_IFBLK:
/* All other file types have zero size in the archive. */
archive_entry_set_size(entry, 0);
break;
default:
archive_entry_set_size(entry, 0);
if (archive_entry_hardlink(entry) == NULL &&
archive_entry_symlink(entry) == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"shar format cannot archive this");
return (ARCHIVE_WARN);
}
}
/* Stock preparation for all file types. */
ret = shar_printf(a, "echo x %s\n", name);
if (ret != ARCHIVE_OK)
return (ret);
if (!S_ISDIR(st->st_mode)) {
/* Try to create the dir. */
p = strdup(name);
pp = strrchr(p, '/');
/* If there is a / character, try to create the dir. */
if (pp != NULL) {
*pp = '\0';
/* Try to avoid a lot of redundant mkdir commands. */
if (strcmp(p, ".") == 0) {
/* Don't try to "mkdir ." */
} else if (shar->last_dir == NULL) {
ret = shar_printf(a,
"mkdir -p %s > /dev/null 2>&1\n", p);
if (ret != ARCHIVE_OK)
return (ret);
shar->last_dir = p;
} else if (strcmp(p, shar->last_dir) == 0) {
/* We've already created this exact dir. */
free(p);
} else if (strlen(p) < strlen(shar->last_dir) &&
strncmp(p, shar->last_dir, strlen(p)) == 0) {
/* We've already created a subdir. */
free(p);
} else {
ret = shar_printf(a,
"mkdir -p %s > /dev/null 2>&1\n", p);
if (ret != ARCHIVE_OK)
return (ret);
free(shar->last_dir);
shar->last_dir = p;
}
}
}
/* Handle file-type specific issues. */
shar->has_data = 0;
if ((linkname = archive_entry_hardlink(entry)) != NULL) {
ret = shar_printf(a, "ln -f %s %s\n", linkname, name);
if (ret != ARCHIVE_OK)
return (ret);
} else if ((linkname = archive_entry_symlink(entry)) != NULL) {
ret = shar_printf(a, "ln -fs %s %s\n", linkname, name);
if (ret != ARCHIVE_OK)
return (ret);
} else {
switch(st->st_mode & S_IFMT) {
case S_IFREG:
if (archive_entry_size(entry) == 0) {
/* More portable than "touch." */
ret = shar_printf(a, "test -e \"%s\" || :> \"%s\"\n", name, name);
if (ret != ARCHIVE_OK)
return (ret);
} else {
if (shar->dump) {
ret = shar_printf(a,
"uudecode -o %s << 'SHAR_END'\n",
name);
if (ret != ARCHIVE_OK)
return (ret);
ret = shar_printf(a, "begin %o %s\n",
archive_entry_mode(entry) & 0777,
name);
if (ret != ARCHIVE_OK)
return (ret);
} else {
ret = shar_printf(a,
"sed 's/^X//' > %s << 'SHAR_END'\n",
name);
if (ret != ARCHIVE_OK)
return (ret);
}
shar->has_data = 1;
shar->end_of_line = 1;
shar->outpos = 0;
shar->outbytes = 0;
}
break;
case S_IFDIR:
ret = shar_printf(a, "mkdir -p %s > /dev/null 2>&1\n",
name);
if (ret != ARCHIVE_OK)
return (ret);
/* Record that we just created this directory. */
if (shar->last_dir != NULL)
free(shar->last_dir);
shar->last_dir = strdup(name);
/* Trim a trailing '/'. */
pp = strrchr(shar->last_dir, '/');
if (pp != NULL && pp[1] == '\0')
*pp = '\0';
/*
* TODO: Put dir name/mode on a list to be fixed
* up at end of archive.
*/
break;
case S_IFIFO:
ret = shar_printf(a, "mkfifo %s\n", name);
if (ret != ARCHIVE_OK)
return (ret);
break;
case S_IFCHR:
ret = shar_printf(a, "mknod %s c %d %d\n", name,
archive_entry_rdevmajor(entry),
archive_entry_rdevminor(entry));
if (ret != ARCHIVE_OK)
return (ret);
break;
case S_IFBLK:
ret = shar_printf(a, "mknod %s b %d %d\n", name,
archive_entry_rdevmajor(entry),
archive_entry_rdevminor(entry));
if (ret != ARCHIVE_OK)
return (ret);
break;
default:
return (ARCHIVE_WARN);
}
}
return (ARCHIVE_OK);
}
/* XXX TODO: This could be more efficient XXX */
static ssize_t
archive_write_shar_data_sed(struct archive_write *a, const void *buff, size_t n)
{
struct shar *shar;
const char *src;
int ret;
size_t written = n;
shar = (struct shar *)a->format_data;
if (!shar->has_data)
return (0);
src = (const char *)buff;
ret = ARCHIVE_OK;
shar->outpos = 0;
while (n-- > 0) {
if (shar->end_of_line) {
shar->outbuff[shar->outpos++] = 'X';
shar->end_of_line = 0;
}
if (*src == '\n')
shar->end_of_line = 1;
shar->outbuff[shar->outpos++] = *src++;
if (shar->outpos > sizeof(shar->outbuff) - 2) {
ret = (a->compression_write)(a, shar->outbuff,
shar->outpos);
if (ret != ARCHIVE_OK)
return (ret);
shar->outpos = 0;
}
}
if (shar->outpos > 0)
ret = (a->compression_write)(a, shar->outbuff, shar->outpos);
if (ret != ARCHIVE_OK)
return (ret);
return (written);
}
#define UUENC(c) (((c)!=0) ? ((c) & 077) + ' ': '`')
/* XXX This could be a lot more efficient. XXX */
static void
uuencode_group(struct shar *shar)
{
int t;
t = 0;
if (shar->uuavail > 0)
t = 0xff0000 & (shar->uubuffer[0] << 16);
if (shar->uuavail > 1)
t |= 0x00ff00 & (shar->uubuffer[1] << 8);
if (shar->uuavail > 2)
t |= 0x0000ff & (shar->uubuffer[2]);
shar->outbuff[shar->outpos++] = UUENC( 0x3f & (t>>18) );
shar->outbuff[shar->outpos++] = UUENC( 0x3f & (t>>12) );
shar->outbuff[shar->outpos++] = UUENC( 0x3f & (t>>6) );
shar->outbuff[shar->outpos++] = UUENC( 0x3f & (t) );
shar->uuavail = 0;
shar->outbytes += shar->uuavail;
shar->outbuff[shar->outpos] = 0;
}
static ssize_t
archive_write_shar_data_uuencode(struct archive_write *a, const void *buff,
size_t length)
{
struct shar *shar;
const char *src;
size_t n;
int ret;
shar = (struct shar *)a->format_data;
if (!shar->has_data)
return (ARCHIVE_OK);
src = (const char *)buff;
n = length;
while (n-- > 0) {
if (shar->uuavail == 3)
uuencode_group(shar);
if (shar->outpos >= 60) {
ret = shar_printf(a, "%c%s\n", UUENC(shar->outbytes),
shar->outbuff);
if (ret != ARCHIVE_OK)
return (ret);
shar->outpos = 0;
shar->outbytes = 0;
}
shar->uubuffer[shar->uuavail++] = *src++;
shar->outbytes++;
}
return (length);
}
static int
archive_write_shar_finish_entry(struct archive_write *a)
{
const char *g, *p, *u;
struct shar *shar;
int ret;
shar = (struct shar *)a->format_data;
if (shar->entry == NULL)
return (0);
if (shar->dump) {
/* Finish uuencoded data. */
if (shar->has_data) {
if (shar->uuavail > 0)
uuencode_group(shar);
if (shar->outpos > 0) {
ret = shar_printf(a, "%c%s\n",
UUENC(shar->outbytes), shar->outbuff);
if (ret != ARCHIVE_OK)
return (ret);
shar->outpos = 0;
shar->uuavail = 0;
shar->outbytes = 0;
}
ret = shar_printf(a, "%c\n", UUENC(0));
if (ret != ARCHIVE_OK)
return (ret);
ret = shar_printf(a, "end\n", UUENC(0));
if (ret != ARCHIVE_OK)
return (ret);
ret = shar_printf(a, "SHAR_END\n");
if (ret != ARCHIVE_OK)
return (ret);
}
/* Restore file mode, owner, flags. */
/*
* TODO: Don't immediately restore mode for
* directories; defer that to end of script.
*/
ret = shar_printf(a, "chmod %o %s\n",
archive_entry_mode(shar->entry) & 07777,
archive_entry_pathname(shar->entry));
if (ret != ARCHIVE_OK)
return (ret);
u = archive_entry_uname(shar->entry);
g = archive_entry_gname(shar->entry);
if (u != NULL || g != NULL) {
ret = shar_printf(a, "chown %s%s%s %s\n",
(u != NULL) ? u : "",
(g != NULL) ? ":" : "", (g != NULL) ? g : "",
archive_entry_pathname(shar->entry));
if (ret != ARCHIVE_OK)
return (ret);
}
if ((p = archive_entry_fflags_text(shar->entry)) != NULL) {
ret = shar_printf(a, "chflags %s %s\n", p,
archive_entry_pathname(shar->entry));
if (ret != ARCHIVE_OK)
return (ret);
}
/* TODO: restore ACLs */
} else {
if (shar->has_data) {
/* Finish sed-encoded data: ensure last line ends. */
if (!shar->end_of_line) {
ret = shar_printf(a, "\n");
if (ret != ARCHIVE_OK)
return (ret);
}
ret = shar_printf(a, "SHAR_END\n");
if (ret != ARCHIVE_OK)
return (ret);
}
}
archive_entry_free(shar->entry);
shar->entry = NULL;
return (0);
}
static int
archive_write_shar_finish(struct archive_write *a)
{
struct shar *shar;
int ret;
/*
* TODO: Accumulate list of directory names/modes and
* fix them all up at end-of-archive.
*/
shar = (struct shar *)a->format_data;
/*
* Only write the end-of-archive markers if the archive was
* actually started. This avoids problems if someone sets
* shar format, then sets another format (which would invoke
* shar_finish to free the format-specific data).
*/
if (shar->wrote_header) {
ret = shar_printf(a, "exit\n");
if (ret != ARCHIVE_OK)
return (ret);
/* Shar output is never padded. */
archive_write_set_bytes_in_last_block(&a->archive, 1);
/*
* TODO: shar should also suppress padding of
* uncompressed data within gzip/bzip2 streams.
*/
}
return (ARCHIVE_OK);
}
static int
archive_write_shar_destroy(struct archive_write *a)
{
struct shar *shar;
shar = (struct shar *)a->format_data;
if (shar->entry != NULL)
archive_entry_free(shar->entry);
if (shar->last_dir != NULL)
free(shar->last_dir);
archive_string_free(&(shar->work));
free(shar);
a->format_data = NULL;
return (ARCHIVE_OK);
}
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