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gnupg/tools/gpgsplit.c
Werner Koch 096e7457ec Change all quotes in strings and comments to the new GNU standard. 
The asymmetric quotes used by GNU in the past (`...') don't render
nicely on modern systems.  We now use two \x27 characters ('...').

The proper solution would be to use the correct Unicode symmetric
quotes here.  However this has the disadvantage that the system
requires Unicode support.  We don't want that today.  If Unicode is
available a generated po file can be used to output proper quotes.  A
simple sed script like the one used for en@quote is sufficient to
change them.

The changes have been done by applying

  sed -i "s/\`\([^'\`]*\)'/'\1'/g"

to most files and fixing obvious problems by hand.  The msgid strings in
the po files were fixed with a similar command.
2012-06-05 19:29:22 +02:00

883 lines
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/* gpgsplit.c - An OpenPGP packet splitting tool
* Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <assert.h>
#include <sys/types.h>
#ifdef HAVE_DOSISH_SYSTEM
# include <fcntl.h> /* for setmode() */
#endif
#include <zlib.h>
#ifdef HAVE_BZIP2
#include <bzlib.h>
#endif /* HAVE_BZIP2 */
#if defined(__riscos__) && defined(USE_ZLIBRISCOS)
# include "zlib-riscos.h"
#endif
#define INCLUDED_BY_MAIN_MODULE 1
#include "util.h"
#include "openpgpdefs.h"
static int opt_verbose;
static const char *opt_prefix = "";
static int opt_uncompress;
static int opt_secret_to_public;
static int opt_no_split;
static void g10_exit( int rc );
static void split_packets (const char *fname);
enum cmd_and_opt_values {
aNull = 0,
oVerbose = 'v',
oPrefix = 'p',
oUncompress = 500,
oSecretToPublic,
oNoSplit,
aTest
};
static ARGPARSE_OPTS opts[] = {
{ 301, NULL, 0, "@Options:\n " },
{ oVerbose, "verbose", 0, "verbose" },
{ oPrefix, "prefix", 2, "|STRING|Prepend filenames with STRING" },
{ oUncompress, "uncompress", 0, "uncompress a packet"},
{ oSecretToPublic, "secret-to-public", 0, "convert secret keys to public keys"},
{ oNoSplit, "no-split", 0, "write to stdout and don't actually split"},
{0} };
static const char *
my_strusage (int level)
{
const char *p;
switch (level)
{
case 11: p = "gpgsplit (GnuPG)";
break;
case 13: p = VERSION; break;
case 17: p = PRINTABLE_OS_NAME; break;
case 19: p = "Please report bugs to <@EMAIL@>.\n"; break;
case 1:
case 40: p =
"Usage: gpgsplit [options] [files] (-h for help)";
break;
case 41: p =
"Syntax: gpgsplit [options] [files]\n"
"Split an OpenPGP message into packets\n";
break;
default: p = NULL;
}
return p;
}
int
main (int argc, char **argv)
{
ARGPARSE_ARGS pargs;
#ifdef HAVE_DOSISH_SYSTEM
setmode( fileno(stdin), O_BINARY );
setmode( fileno(stdout), O_BINARY );
#endif
log_set_prefix ("gpgsplit", JNLIB_LOG_WITH_PREFIX);
set_strusage (my_strusage);
pargs.argc = &argc;
pargs.argv = &argv;
pargs.flags= 1; /* do not remove the args */
while (optfile_parse( NULL, NULL, NULL, &pargs, opts))
{
switch (pargs.r_opt)
{
case oVerbose: opt_verbose = 1; break;
case oPrefix: opt_prefix = pargs.r.ret_str; break;
case oUncompress: opt_uncompress = 1; break;
case oSecretToPublic: opt_secret_to_public = 1; break;
case oNoSplit: opt_no_split = 1; break;
default : pargs.err = 2; break;
}
}
if (log_get_errorcount(0))
g10_exit (2);
if (!argc)
split_packets (NULL);
else
{
for ( ;argc; argc--, argv++)
split_packets (*argv);
}
g10_exit (0);
return 0;
}
static void
g10_exit (int rc)
{
rc = rc? rc : log_get_errorcount(0)? 2 : 0;
exit(rc );
}
static const char *
pkttype_to_string (int pkttype)
{
const char *s;
switch (pkttype)
{
case PKT_PUBKEY_ENC : s = "pk_enc"; break;
case PKT_SIGNATURE : s = "sig"; break;
case PKT_SYMKEY_ENC : s = "sym_enc"; break;
case PKT_ONEPASS_SIG : s = "onepass_sig"; break;
case PKT_SECRET_KEY : s = "secret_key"; break;
case PKT_PUBLIC_KEY : s = "public_key"; break;
case PKT_SECRET_SUBKEY : s = "secret_subkey"; break;
case PKT_COMPRESSED :
s = opt_uncompress? "uncompressed":"compressed";
break;
case PKT_ENCRYPTED : s = "encrypted"; break;
case PKT_MARKER : s = "marker"; break;
case PKT_PLAINTEXT : s = "plaintext"; break;
case PKT_RING_TRUST : s = "ring_trust"; break;
case PKT_USER_ID : s = "user_id"; break;
case PKT_PUBLIC_SUBKEY : s = "public_subkey"; break;
case PKT_OLD_COMMENT : s = "old_comment"; break;
case PKT_ATTRIBUTE : s = "attribute"; break;
case PKT_ENCRYPTED_MDC : s = "encrypted_mdc"; break;
case PKT_MDC : s = "mdc"; break;
case PKT_COMMENT : s = "comment"; break;
case PKT_GPG_CONTROL : s = "gpg_control"; break;
default: s = "unknown"; break;
}
return s;
}
/*
* Create a new filename and a return a pointer to a statically
* allocated buffer
*/
static char *
create_filename (int pkttype)
{
static unsigned int partno = 0;
static char *name;
if (!name)
name = xmalloc (strlen (opt_prefix) + 100 );
assert (pkttype < 1000 && pkttype >= 0 );
partno++;
sprintf (name, "%s%06u-%03d" EXTSEP_S "%.40s",
opt_prefix, partno, pkttype, pkttype_to_string (pkttype));
return name;
}
static int
read_u16 (FILE *fp, size_t *rn)
{
int c;
if ( (c = getc (fp)) == EOF )
return -1;
*rn = c << 8;
if ( (c = getc (fp)) == EOF )
return -1;
*rn |= c;
return 0;
}
static int
read_u32 (FILE *fp, unsigned long *rn)
{
size_t tmp;
if (read_u16 (fp, &tmp))
return -1;
*rn = tmp << 16;
if (read_u16 (fp, &tmp))
return -1;
*rn |= tmp;
return 0;
}
static int
write_old_header (FILE *fp, int pkttype, unsigned int len)
{
int ctb = (0x80 | ((pkttype & 15)<<2));
if (len < 256)
;
else if (len < 65536)
ctb |= 1;
else
ctb |= 2;
if ( putc ( ctb, fp) == EOF )
return -1;
if ( (ctb & 2) )
{
if (putc ((len>>24), fp) == EOF)
return -1;
if (putc ((len>>16), fp) == EOF)
return -1;
}
if ( (ctb & 3) )
{
if (putc ((len>>8), fp) == EOF)
return -1;
}
if (putc ((len&0xff), fp) == EOF)
return -1;
return 0;
}
static int
write_new_header (FILE *fp, int pkttype, unsigned int len)
{
if ( putc ((0xc0 | (pkttype & 0x3f)), fp) == EOF )
return -1;
if (len < 192)
{
if (putc (len, fp) == EOF)
return -1;
}
else if (len < 8384)
{
len -= 192;
if (putc ((len/256)+192, fp) == EOF)
return -1;
if (putc ((len%256), fp) == EOF)
return -1;
}
else
{
if (putc ( 0xff, fp) == EOF)
return -1;
if (putc ( (len >> 24), fp) == EOF)
return -1;
if (putc ( (len >> 16), fp) == EOF)
return -1;
if (putc ( (len >> 8), fp) == EOF)
return -1;
if (putc ( (len & 0xff), fp) == EOF)
return -1;
}
return 0;
}
/* Return the length of the public key given BUF of BUFLEN with a
secret key. */
static int
public_key_length (const unsigned char *buf, size_t buflen)
{
const unsigned char *s;
int nmpis;
/* byte version number (3 or 4)
u32 creation time
[u16 valid days (version 3 only)]
byte algorithm
n MPIs (n and e) */
if (!buflen)
return 0;
if (buf[0] < 2 || buf[0] > 4)
return 0; /* wrong version number */
if (buflen < (buf[0] == 4? 6:8))
return 0;
s = buf + (buf[0] == 4? 6:8);
buflen -= (buf[0] == 4? 6:8);
switch (s[-1])
{
case 1:
case 2:
case 3:
nmpis = 2;
break;
case 16:
case 20:
nmpis = 3;
break;
case 17:
nmpis = 4;
break;
default:
return 0;
}
for (; nmpis; nmpis--)
{
unsigned int nbits, nbytes;
if (buflen < 2)
return 0;
nbits = (s[0] << 8) | s[1];
s += 2; buflen -= 2;
nbytes = (nbits+7) / 8;
if (buflen < nbytes)
return 0;
s += nbytes; buflen -= nbytes;
}
return s - buf;
}
static int
handle_zlib(int algo,FILE *fpin,FILE *fpout)
{
z_stream zs;
byte *inbuf, *outbuf;
unsigned int inbufsize, outbufsize;
int c,zinit_done, zrc, nread, count;
size_t n;
memset (&zs, 0, sizeof zs);
inbufsize = 2048;
inbuf = xmalloc (inbufsize);
outbufsize = 8192;
outbuf = xmalloc (outbufsize);
zs.avail_in = 0;
zinit_done = 0;
do
{
if (zs.avail_in < inbufsize)
{
n = zs.avail_in;
if (!n)
zs.next_in = (Bytef *) inbuf;
count = inbufsize - n;
for (nread=0;
nread < count && (c=getc (fpin)) != EOF;
nread++)
inbuf[n+nread] = c;
n += nread;
if (nread < count && algo == 1)
{
inbuf[n] = 0xFF; /* chew dummy byte */
n++;
}
zs.avail_in = n;
}
zs.next_out = (Bytef *) outbuf;
zs.avail_out = outbufsize;
if (!zinit_done)
{
zrc = (algo == 1? inflateInit2 ( &zs, -13)
: inflateInit ( &zs ));
if (zrc != Z_OK)
{
log_fatal ("zlib problem: %s\n", zs.msg? zs.msg :
zrc == Z_MEM_ERROR ? "out of core" :
zrc == Z_VERSION_ERROR ?
"invalid lib version" :
"unknown error" );
}
zinit_done = 1;
}
else
{
#ifdef Z_SYNC_FLUSH
zrc = inflate (&zs, Z_SYNC_FLUSH);
#else
zrc = inflate (&zs, Z_PARTIAL_FLUSH);
#endif
if (zrc == Z_STREAM_END)
; /* eof */
else if (zrc != Z_OK && zrc != Z_BUF_ERROR)
{
if (zs.msg)
log_fatal ("zlib inflate problem: %s\n", zs.msg );
else
log_fatal ("zlib inflate problem: rc=%d\n", zrc );
}
for (n=0; n < outbufsize - zs.avail_out; n++)
{
if (putc (outbuf[n], fpout) == EOF )
return 1;
}
}
}
while (zrc != Z_STREAM_END && zrc != Z_BUF_ERROR);
{
int i;
fputs ("Left over bytes:", stderr);
for (i=0; i < zs.avail_in; i++)
fprintf (stderr, " %02X", zs.next_in[i]);
putc ('\n', stderr);
}
inflateEnd (&zs);
return 0;
}
#ifdef HAVE_BZIP2
static int
handle_bzip2(int algo,FILE *fpin,FILE *fpout)
{
bz_stream bzs;
byte *inbuf, *outbuf;
unsigned int inbufsize, outbufsize;
int c,zinit_done, zrc, nread, count;
size_t n;
memset (&bzs, 0, sizeof bzs);
inbufsize = 2048;
inbuf = xmalloc (inbufsize);
outbufsize = 8192;
outbuf = xmalloc (outbufsize);
bzs.avail_in = 0;
zinit_done = 0;
do
{
if (bzs.avail_in < inbufsize)
{
n = bzs.avail_in;
if (!n)
bzs.next_in = inbuf;
count = inbufsize - n;
for (nread=0;
nread < count && (c=getc (fpin)) != EOF;
nread++)
inbuf[n+nread] = c;
n += nread;
if (nread < count && algo == 1)
{
inbuf[n] = 0xFF; /* chew dummy byte */
n++;
}
bzs.avail_in = n;
}
bzs.next_out = outbuf;
bzs.avail_out = outbufsize;
if (!zinit_done)
{
zrc = BZ2_bzDecompressInit(&bzs,0,0);
if (zrc != BZ_OK)
log_fatal ("bz2lib problem: %d\n",zrc);
zinit_done = 1;
}
else
{
zrc = BZ2_bzDecompress(&bzs);
if (zrc == BZ_STREAM_END)
; /* eof */
else if (zrc != BZ_OK && zrc != BZ_PARAM_ERROR)
log_fatal ("bz2lib inflate problem: %d\n", zrc );
for (n=0; n < outbufsize - bzs.avail_out; n++)
{
if (putc (outbuf[n], fpout) == EOF )
return 1;
}
}
}
while (zrc != BZ_STREAM_END && zrc != BZ_PARAM_ERROR);
BZ2_bzDecompressEnd(&bzs);
return 0;
}
#endif /* HAVE_BZIP2 */
/* hdr must point to a buffer large enough to hold all header bytes */
static int
write_part (FILE *fpin, unsigned long pktlen,
int pkttype, int partial, unsigned char *hdr, size_t hdrlen)
{
FILE *fpout;
int c, first;
unsigned char *p;
const char *outname = create_filename (pkttype);
#if defined(__riscos__) && defined(USE_ZLIBRISCOS)
static int initialized = 0;
if (!initialized)
initialized = riscos_load_module("ZLib", zlib_path, 1);
#endif
if (opt_no_split)
fpout = stdout;
else
{
if (opt_verbose)
log_info ("writing '%s'\n", outname);
fpout = fopen (outname, "wb");
if (!fpout)
{
log_error ("error creating '%s': %s\n", outname, strerror(errno));
/* stop right now, otherwise we would mess up the sequence
of the part numbers */
g10_exit (1);
}
}
if (opt_secret_to_public
&& (pkttype == PKT_SECRET_KEY || pkttype == PKT_SECRET_SUBKEY))
{
unsigned char *blob = xmalloc (pktlen);
int i, len;
pkttype = pkttype == PKT_SECRET_KEY? PKT_PUBLIC_KEY:PKT_PUBLIC_SUBKEY;
for (i=0; i < pktlen; i++)
{
c = getc (fpin);
if (c == EOF)
goto read_error;
blob[i] = c;
}
len = public_key_length (blob, pktlen);
if (!len)
{
log_error ("error calcualting public key length\n");
g10_exit (1);
}
if ( (hdr[0] & 0x40) )
{
if (write_new_header (fpout, pkttype, len))
goto write_error;
}
else
{
if (write_old_header (fpout, pkttype, len))
goto write_error;
}
for (i=0; i < len; i++)
{
if ( putc (blob[i], fpout) == EOF )
goto write_error;
}
goto ready;
}
if (!opt_uncompress)
{
for (p=hdr; hdrlen; p++, hdrlen--)
{
if ( putc (*p, fpout) == EOF )
goto write_error;
}
}
first = 1;
while (partial)
{
size_t partlen;
if (partial == 1)
{ /* openpgp */
if (first )
{
c = pktlen;
assert( c >= 224 && c < 255 );
first = 0;
}
else if ((c = getc (fpin)) == EOF )
goto read_error;
else
hdr[hdrlen++] = c;
if (c < 192)
{
pktlen = c;
partial = 0; /* (last segment may follow) */
}
else if (c < 224 )
{
pktlen = (c - 192) * 256;
if ((c = getc (fpin)) == EOF)
goto read_error;
hdr[hdrlen++] = c;
pktlen += c + 192;
partial = 0;
}
else if (c == 255)
{
if (read_u32 (fpin, &pktlen))
goto read_error;
hdr[hdrlen++] = pktlen >> 24;
hdr[hdrlen++] = pktlen >> 16;
hdr[hdrlen++] = pktlen >> 8;
hdr[hdrlen++] = pktlen;
partial = 0;
}
else
{ /* next partial body length */
for (p=hdr; hdrlen; p++, hdrlen--)
{
if ( putc (*p, fpout) == EOF )
goto write_error;
}
partlen = 1 << (c & 0x1f);
for (; partlen; partlen--)
{
if ((c = getc (fpin)) == EOF)
goto read_error;
if ( putc (c, fpout) == EOF )
goto write_error;
}
}
}
else if (partial == 2)
{ /* old gnupg */
assert (!pktlen);
if ( read_u16 (fpin, &partlen) )
goto read_error;
hdr[hdrlen++] = partlen >> 8;
hdr[hdrlen++] = partlen;
for (p=hdr; hdrlen; p++, hdrlen--)
{
if ( putc (*p, fpout) == EOF )
goto write_error;
}
if (!partlen)
partial = 0; /* end of packet */
for (; partlen; partlen--)
{
c = getc (fpin);
if (c == EOF)
goto read_error;
if ( putc (c, fpout) == EOF )
goto write_error;
}
}
else
{ /* compressed: read to end */
pktlen = 0;
partial = 0;
hdrlen = 0;
if (opt_uncompress)
{
if ((c = getc (fpin)) == EOF)
goto read_error;
if(c==1 || c==2)
{
if(handle_zlib(c,fpin,fpout))
goto write_error;
}
#ifdef HAVE_BZIP2
else if(c==3)
{
if(handle_bzip2(c,fpin,fpout))
goto write_error;
}
#endif /* HAVE_BZIP2 */
else
{
log_error("invalid compression algorithm (%d)\n",c);
goto read_error;
}
}
else
{
while ( (c=getc (fpin)) != EOF )
{
if ( putc (c, fpout) == EOF )
goto write_error;
}
}
if (!feof (fpin))
goto read_error;
}
}
for (p=hdr; hdrlen; p++, hdrlen--)
{
if ( putc (*p, fpout) == EOF )
goto write_error;
}
/* standard packet or last segment of partial length encoded packet */
for (; pktlen; pktlen--)
{
c = getc (fpin);
if (c == EOF)
goto read_error;
if ( putc (c, fpout) == EOF )
goto write_error;
}
ready:
if ( !opt_no_split && fclose (fpout) )
log_error ("error closing '%s': %s\n", outname, strerror (errno));
return 0;
write_error:
log_error ("error writing '%s': %s\n", outname, strerror (errno));
if (!opt_no_split)
fclose (fpout);
return 2;
read_error:
if (!opt_no_split)
{
int save = errno;
fclose (fpout);
errno = save;
}
return -1;
}
static int
do_split (FILE *fp)
{
int c, ctb, pkttype;
unsigned long pktlen = 0;
int partial = 0;
unsigned char header[20];
int header_idx = 0;
ctb = getc (fp);
if (ctb == EOF)
return 3; /* ready */
header[header_idx++] = ctb;
if (!(ctb & 0x80))
{
log_error("invalid CTB %02x\n", ctb );
return 1;
}
if ( (ctb & 0x40) )
{ /* new CTB */
pkttype = (ctb & 0x3f);
if( (c = getc (fp)) == EOF )
return -1;
header[header_idx++] = c;
if ( c < 192 )
pktlen = c;
else if ( c < 224 )
{
pktlen = (c - 192) * 256;
if( (c = getc (fp)) == EOF )
return -1;
header[header_idx++] = c;
pktlen += c + 192;
}
else if ( c == 255 )
{
if (read_u32 (fp, &pktlen))
return -1;
header[header_idx++] = pktlen >> 24;
header[header_idx++] = pktlen >> 16;
header[header_idx++] = pktlen >> 8;
header[header_idx++] = pktlen;
}
else
{ /* partial body length */
pktlen = c;
partial = 1;
}
}
else
{
int lenbytes;
pkttype = (ctb>>2)&0xf;
lenbytes = ((ctb&3)==3)? 0 : (1<<(ctb & 3));
if (!lenbytes )
{
pktlen = 0; /* don't know the value */
if( pkttype == PKT_COMPRESSED )
partial = 3;
else
partial = 2; /* the old GnuPG partial length encoding */
}
else
{
for ( ; lenbytes; lenbytes-- )
{
pktlen <<= 8;
if( (c = getc (fp)) == EOF )
return -1;
header[header_idx++] = c;
pktlen |= c;
}
}
}
return write_part (fp, pktlen, pkttype, partial, header, header_idx);
}
static void
split_packets (const char *fname)
{
FILE *fp;
int rc;
if (!fname || !strcmp (fname, "-"))
{
fp = stdin;
fname = "-";
}
else if ( !(fp = fopen (fname,"rb")) )
{
log_error ("can't open '%s': %s\n", fname, strerror (errno));
return;
}
while ( !(rc = do_split (fp)) )
;
if ( rc > 0 )
; /* error already handled */
else if ( ferror (fp) )
log_error ("error reading '%s': %s\n", fname, strerror (errno));
else
log_error ("premature EOF while reading '%s'\n", fname );
if ( fp != stdin )
fclose (fp);
}
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