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gnupg/util/iobuf.c
Werner Koch 22caa5c2d4
Fix possible sign extension problem with newer compilers. 
* cipher/des.c (READ_64BIT_DATA): Cast to u32 before shifting by 24.
* cipher/blowfish.c (do_encrypt_block): Ditto.
(do_decrypt_block): Ditto.
* cipher/camellia.c (CAMELLIA_RR8): Ditto.
* cipher/cast5.c (do_encrypt_block): Ditto.
(do_decrypt_block): Ditto.
(do_cast_setkey): Ditto.
* cipher/twofish.c (INPACK): Ditto.
* util/iobuf.c (block_filter): Ditto.
--

For cipher/des.c
Reported-by: Balint Reczey <balint@balintreczey.hu>

See commit 57af33d9e7 for details.

Signed-off-by: Werner Koch <wk@gnupg.org>
2016-02-01 18:15:28 +01:00

2373 lines
58 KiB
C
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/* iobuf.c - file handling
* Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2008,
* 2009 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#ifdef HAVE_DOSISH_SYSTEM
#include <windows.h>
#endif
#ifdef __riscos__
#include <kernel.h>
#include <swis.h>
#endif /* __riscos__ */
#include "memory.h"
#include "util.h"
#include "dynload.h"
#include "iobuf.h"
#ifdef __VMS
# include "vms.h"
# define open open_vms
#endif /* def __VMS */
/* The size of the internal buffers.
NOTE: If you change this value you MUST also adjust the regression
test "armored_key_8192" and "nopad_armored_msg" in armor.test! */
#define IOBUF_BUFFER_SIZE 8192
#undef FILE_FILTER_USES_STDIO
/* To avoid a potential DoS with compression packets we better limit
the number of filters in a chain. */
#define MAX_NESTING_FILTER 64
#ifdef HAVE_DOSISH_SYSTEM
#define USE_SETMODE 1
#endif
#ifdef FILE_FILTER_USES_STDIO
#define my_fileno(a) fileno ((a))
#define my_fopen_ro(a,b) fopen ((a),(b))
#define my_fopen(a,b) fopen ((a),(b))
typedef FILE *FILEP_OR_FD;
#define INVALID_FP NULL
#define FILEP_OR_FD_FOR_STDIN (stdin)
#define FILEP_OR_FD_FOR_STDOUT (stdout)
typedef struct {
FILE *fp; /* open file handle */
int keep_open;
int no_cache;
int print_only_name; /* flags indicating that fname is not a real file*/
char fname[1]; /* name of the file */
} file_filter_ctx_t ;
#else
#define my_fileno(a) (a)
#define my_fopen_ro(a,b) fd_cache_open ((a),(b))
#define my_fopen(a,b) direct_open ((a),(b))
#ifdef HAVE_DOSISH_SYSTEM
typedef HANDLE FILEP_OR_FD;
#define INVALID_FP ((HANDLE)-1)
#define FILEP_OR_FD_FOR_STDIN (GetStdHandle (STD_INPUT_HANDLE))
#define FILEP_OR_FD_FOR_STDOUT (GetStdHandle (STD_OUTPUT_HANDLE))
#undef USE_SETMODE
#else
typedef int FILEP_OR_FD;
#define INVALID_FP (-1)
#define FILEP_OR_FD_FOR_STDIN (0)
#define FILEP_OR_FD_FOR_STDOUT (1)
#endif
typedef struct {
FILEP_OR_FD fp; /* open file handle */
int keep_open;
int no_cache;
int eof_seen;
int print_only_name; /* flags indicating that fname is not a real file*/
char fname[1]; /* name of the file */
} file_filter_ctx_t ;
struct close_cache_s {
struct close_cache_s *next;
FILEP_OR_FD fp;
char fname[1];
};
typedef struct close_cache_s *CLOSE_CACHE;
static CLOSE_CACHE close_cache;
#endif
#ifdef _WIN32
typedef struct {
int sock;
int keep_open;
int no_cache;
int eof_seen;
int print_only_name; /* flags indicating that fname is not a real file*/
char fname[1]; /* name of the file */
} sock_filter_ctx_t ;
#endif /*_WIN32*/
/* The first partial length header block must be of size 512
* to make it easier (and efficienter) we use a min. block size of 512
* for all chunks (but the last one) */
#define OP_MIN_PARTIAL_CHUNK 512
#define OP_MIN_PARTIAL_CHUNK_2POW 9
typedef struct {
int use;
size_t size;
size_t count;
int partial; /* 1 = partial header, 2 in last partial packet */
char *buffer; /* used for partial header */
size_t buflen; /* used size of buffer */
int first_c; /* of partial header (which is > 0)*/
int eof;
} block_filter_ctx_t;
static int special_names_enabled;
static int underflow(IOBUF a);
static int translate_file_handle ( int fd, int for_write );
#ifndef FILE_FILTER_USES_STDIO
/* This is a replacement for strcmp. Under W32 it does not
distinguish between backslash and slash. */
static int
fd_cache_strcmp (const char *a, const char *b)
{
#ifdef HAVE_DOSISH_SYSTEM
for (; *a && *b; a++, b++)
{
if (*a != *b && !((*a == '/' && *b == '\\')
|| (*a == '\\' && *b == '/')) )
break;
}
return *(const unsigned char *)a - *(const unsigned char *)b;
#else
return strcmp (a, b);
#endif
}
/*
* Invalidate (i.e. close) a cached iobuf or all iobufs if NULL is
* used for FNAME.
*/
static int
fd_cache_invalidate (const char *fname)
{
CLOSE_CACHE cc;
int err=0;
if (!fname) {
if( DBG_IOBUF )
log_debug ("fd_cache_invalidate (all)\n");
for (cc=close_cache; cc; cc = cc->next ) {
if ( cc->fp != INVALID_FP ) {
#ifdef HAVE_DOSISH_SYSTEM
CloseHandle (cc->fp);
#else
close(cc->fp);
#endif
cc->fp = INVALID_FP;
}
}
return err;
}
if( DBG_IOBUF )
log_debug ("fd_cache_invalidate (%s)\n", fname);
for (cc=close_cache; cc; cc = cc->next ) {
if ( cc->fp != INVALID_FP && !fd_cache_strcmp (cc->fname, fname) ) {
if( DBG_IOBUF )
log_debug (" did (%s)\n", cc->fname);
#ifdef HAVE_DOSISH_SYSTEM
if(CloseHandle (cc->fp)==0)
err=-1;
#else
err=close(cc->fp);
#endif
cc->fp = INVALID_FP;
}
}
return err;
}
static int
fd_cache_synchronize(const char *fname)
{
int err=0;
#ifndef HAVE_DOSISH_SYSTEM
CLOSE_CACHE cc;
if( DBG_IOBUF )
log_debug ("fd_cache_synchronize (%s)\n", fname);
for (cc=close_cache; cc; cc = cc->next )
{
if ( cc->fp != INVALID_FP && !fd_cache_strcmp (cc->fname, fname) )
{
if( DBG_IOBUF )
log_debug (" did (%s)\n", cc->fname);
err=fsync(cc->fp);
}
}
#endif
return err;
}
static FILEP_OR_FD
direct_open (const char *fname, const char *mode)
{
#ifdef HAVE_DOSISH_SYSTEM
unsigned long da, cd, sm;
HANDLE hfile;
/* Note, that we do not handle all mode combinations */
/* According to the ReactOS source it seems that open() of the
* standard MSW32 crt does open the file in share mode which is
* something new for MS applications ;-)
*/
if ( strchr (mode, '+') ) {
fd_cache_invalidate (fname);
da = GENERIC_READ|GENERIC_WRITE;
cd = OPEN_EXISTING;
sm = FILE_SHARE_READ | FILE_SHARE_WRITE;
}
else if ( strchr (mode, 'w') ) {
fd_cache_invalidate (fname);
da = GENERIC_WRITE;
cd = CREATE_ALWAYS;
sm = FILE_SHARE_WRITE;
}
else {
da = GENERIC_READ;
cd = OPEN_EXISTING;
sm = FILE_SHARE_READ;
}
hfile = CreateFile (fname, da, sm, NULL, cd, FILE_ATTRIBUTE_NORMAL, NULL);
return hfile;
#else
int oflag;
int cflag = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
/* Note, that we do not handle all mode combinations */
if ( strchr (mode, '+') ) {
fd_cache_invalidate (fname);
oflag = O_RDWR;
}
else if ( strchr (mode, 'w') ) {
fd_cache_invalidate (fname);
oflag = O_WRONLY | O_CREAT | O_TRUNC;
}
else {
oflag = O_RDONLY;
}
#ifdef O_BINARY
if (strchr (mode, 'b'))
oflag |= O_BINARY;
#endif
#ifndef __riscos__
return open (fname, oflag, cflag );
#else
{
struct stat buf;
int rc = stat( fname, &buf );
/* Don't allow iobufs on directories */
if( !rc && S_ISDIR(buf.st_mode) && !S_ISREG(buf.st_mode) )
return __set_errno( EISDIR );
else
return open( fname, oflag, cflag );
}
#endif
#endif
}
/*
* Instead of closing an FD we keep it open and cache it for later reuse
* Note that this caching strategy only works if the process does not chdir.
*/
static void
fd_cache_close (const char *fname, FILEP_OR_FD fp)
{
CLOSE_CACHE cc;
assert (fp);
if ( !fname || !*fname ) {
#ifdef HAVE_DOSISH_SYSTEM
CloseHandle (fp);
#else
close(fp);
#endif
if( DBG_IOBUF )
log_debug ("fd_cache_close (%d) real\n", (int)fp);
return;
}
/* try to reuse a slot */
for (cc=close_cache; cc; cc = cc->next ) {
if ( cc->fp == INVALID_FP && !fd_cache_strcmp (cc->fname, fname) ) {
cc->fp = fp;
if( DBG_IOBUF )
log_debug ("fd_cache_close (%s) used existing slot\n", fname);
return;
}
}
/* add a new one */
if( DBG_IOBUF )
log_debug ("fd_cache_close (%s) new slot created\n", fname);
cc = xmalloc_clear (sizeof *cc + strlen (fname));
strcpy (cc->fname, fname);
cc->fp = fp;
cc->next = close_cache;
close_cache = cc;
}
/*
* Do an direct_open on FNAME but first try to reuse one from the fd_cache
*/
static FILEP_OR_FD
fd_cache_open (const char *fname, const char *mode)
{
CLOSE_CACHE cc;
assert (fname);
for (cc=close_cache; cc; cc = cc->next ) {
if ( cc->fp != INVALID_FP && !fd_cache_strcmp (cc->fname, fname) ) {
FILEP_OR_FD fp = cc->fp;
cc->fp = INVALID_FP;
if( DBG_IOBUF )
log_debug ("fd_cache_open (%s) using cached fp\n", fname);
#ifdef HAVE_DOSISH_SYSTEM
if (SetFilePointer (fp, 0, NULL, FILE_BEGIN) == 0xffffffff ) {
log_error ("rewind file failed on handle %p: %s\n",
fp, w32_strerror (errno));
fp = INVALID_FP;
}
#else
if ( lseek (fp, 0, SEEK_SET) == (off_t)-1 ) {
log_error("can't rewind fd %d: %s\n", fp, strerror(errno) );
fp = INVALID_FP;
}
#endif
return fp;
}
}
if( DBG_IOBUF )
log_debug ("fd_cache_open (%s) not cached\n", fname);
return direct_open (fname, mode);
}
#endif /*FILE_FILTER_USES_STDIO*/
/****************
* Read data from a file into buf which has an allocated length of *LEN.
* return the number of read bytes in *LEN. OPAQUE is the FILE * of
* the stream. A is not used.
* control may be:
* IOBUFCTRL_INIT: called just before the function is linked into the
* list of function. This can be used to prepare internal
* data structures of the function.
* IOBUFCTRL_FREE: called just before the function is removed from the
* list of functions and can be used to release internal
* data structures or close a file etc.
* IOBUFCTRL_UNDERFLOW: called by iobuf_underflow to fill the buffer
* with new stuff. *RET_LEN is the available size of the
* buffer, and should be set to the number of bytes
* which were put into the buffer. The function
* returns 0 to indicate success, -1 on EOF and
* G10ERR_xxxxx for other errors.
*
* IOBUFCTRL_FLUSH: called by iobuf_flush() to write out the collected stuff.
* *RET_LAN is the number of bytes in BUF.
*
* IOBUFCTRL_CANCEL: send to all filters on behalf of iobuf_cancel. The
* filter may take appropriate action on this message.
*/
static int
file_filter(void *opaque, int control, IOBUF chain, byte *buf, size_t *ret_len)
{
file_filter_ctx_t *a = opaque;
FILEP_OR_FD f = a->fp;
size_t size = *ret_len;
size_t nbytes = 0;
int rc = 0;
#ifdef FILE_FILTER_USES_STDIO
if( control == IOBUFCTRL_UNDERFLOW ) {
assert( size ); /* need a buffer */
if ( feof(f)) { /* On terminals you could easiely read as many EOFs as you call */
rc = -1; /* fread() or fgetc() repeatly. Every call will block until you press */
*ret_len = 0; /* CTRL-D. So we catch this case before we call fread() again. */
}
else {
clearerr( f );
nbytes = fread( buf, 1, size, f );
if( feof(f) && !nbytes ) {
rc = -1; /* okay: we can return EOF now. */
}
else if( ferror(f) && errno != EPIPE ) {
log_error("%s: read error: %s\n",
a->fname, strerror(errno));
rc = G10ERR_READ_FILE;
}
*ret_len = nbytes;
}
}
else if( control == IOBUFCTRL_FLUSH ) {
if( size ) {
clearerr( f );
nbytes = fwrite( buf, 1, size, f );
if( ferror(f) ) {
log_error("%s: write error: %s\n", a->fname, strerror(errno));
rc = G10ERR_WRITE_FILE;
}
}
*ret_len = nbytes;
}
else if( control == IOBUFCTRL_INIT ) {
a->keep_open = a->no_cache = 0;
}
else if( control == IOBUFCTRL_DESC ) {
mem2str (buf, "file_filter", *ret_len);
}
else if( control == IOBUFCTRL_FREE ) {
if( f != stdin && f != stdout ) {
if( DBG_IOBUF )
log_debug("%s: close fd %d\n", a->fname, fileno(f) );
if (!a->keep_open)
fclose(f);
}
f = NULL;
xfree(a); /* we can free our context now */
}
#else /* !stdio implementation */
if( control == IOBUFCTRL_UNDERFLOW ) {
assert( size ); /* need a buffer */
if ( a->eof_seen) {
rc = -1;
*ret_len = 0;
}
else {
#ifdef HAVE_DOSISH_SYSTEM
unsigned long nread;
nbytes = 0;
if ( !ReadFile ( f, buf, size, &nread, NULL ) ) {
if ((int)GetLastError () != ERROR_BROKEN_PIPE) {
log_error ("%s: read error: %s\n", a->fname,
w32_strerror (0));
rc = G10ERR_READ_FILE;
}
}
else if ( !nread ) {
a->eof_seen = 1;
rc = -1;
}
else {
nbytes = nread;
}
#else
int n;
nbytes = 0;
do {
n = read ( f, buf, size );
} while (n == -1 && errno == EINTR );
if ( n == -1 ) { /* error */
if (errno != EPIPE) {
log_error("%s: read error: %s\n",
a->fname, strerror(errno));
rc = G10ERR_READ_FILE;
}
}
else if ( !n ) { /* eof */
a->eof_seen = 1;
rc = -1;
}
else {
nbytes = n;
}
#endif
*ret_len = nbytes;
}
}
else if( control == IOBUFCTRL_FLUSH ) {
if( size ) {
#ifdef HAVE_DOSISH_SYSTEM
byte *p = buf;
unsigned long n;
nbytes = size;
do {
if (size && !WriteFile (f, p, nbytes, &n, NULL)) {
log_error ("%s: write error: %s\n", a->fname,
w32_strerror (0));
rc = G10ERR_WRITE_FILE;
break;
}
p += n;
nbytes -= n;
} while ( nbytes );
nbytes = p - buf;
#else
byte *p = buf;
int n;
nbytes = size;
do {
do {
n = write ( f, p, nbytes );
} while ( n == -1 && errno == EINTR );
if ( n > 0 ) {
p += n;
nbytes -= n;
}
} while ( n != -1 && nbytes );
if( n == -1 ) {
log_error("%s: write error: %s\n", a->fname, strerror(errno));
rc = G10ERR_WRITE_FILE;
}
nbytes = p - buf;
#endif
}
*ret_len = nbytes;
}
else if ( control == IOBUFCTRL_INIT ) {
a->eof_seen = 0;
a->keep_open = 0;
a->no_cache = 0;
}
else if ( control == IOBUFCTRL_DESC ) {
mem2str (buf, "file_filter(fd)", *ret_len);
}
else if ( control == IOBUFCTRL_FREE ) {
#ifdef HAVE_DOSISH_SYSTEM
if ( f != FILEP_OR_FD_FOR_STDIN && f != FILEP_OR_FD_FOR_STDOUT ) {
if( DBG_IOBUF )
log_debug("%s: close handle %p\n", a->fname, f );
if (!a->keep_open)
fd_cache_close (a->no_cache?NULL:a->fname, f);
}
#else
if ( (int)f != 0 && (int)f != 1 ) {
if( DBG_IOBUF )
log_debug("%s: close fd %d\n", a->fname, f );
if (!a->keep_open)
fd_cache_close (a->no_cache?NULL:a->fname, f);
}
f = INVALID_FP;
#endif
xfree (a); /* we can free our context now */
}
#endif /* !stdio implementation */
return rc;
}
#ifdef _WIN32
/* Becuase sockets are an special object under Lose32 we have to
* use a special filter */
static int
sock_filter (void *opaque, int control, IOBUF chain, byte *buf, size_t *ret_len)
{
sock_filter_ctx_t *a = opaque;
size_t size = *ret_len;
size_t nbytes = 0;
int rc = 0;
if( control == IOBUFCTRL_UNDERFLOW ) {
assert( size ); /* need a buffer */
if ( a->eof_seen) {
rc = -1;
*ret_len = 0;
}
else {
int nread;
nread = recv ( a->sock, buf, size, 0 );
if ( nread == SOCKET_ERROR ) {
int ec = (int)WSAGetLastError ();
log_error("socket read error: ec=%d\n", ec);
rc = G10ERR_READ_FILE;
}
else if ( !nread ) {
a->eof_seen = 1;
rc = -1;
}
else {
nbytes = nread;
}
*ret_len = nbytes;
}
}
else if( control == IOBUFCTRL_FLUSH ) {
if( size ) {
byte *p = buf;
int n;
nbytes = size;
do {
n = send (a->sock, p, nbytes, 0);
if ( n == SOCKET_ERROR ) {
int ec = (int)WSAGetLastError ();
log_error("socket write error: ec=%d\n", ec);
rc = G10ERR_WRITE_FILE;
break;
}
p += n;
nbytes -= n;
} while ( nbytes );
nbytes = p - buf;
}
*ret_len = nbytes;
}
else if ( control == IOBUFCTRL_INIT ) {
a->eof_seen = 0;
a->keep_open = 0;
a->no_cache = 0;
}
else if ( control == IOBUFCTRL_DESC ) {
mem2str (buf, "sock_filter", *ret_len);
}
else if ( control == IOBUFCTRL_FREE ) {
if (!a->keep_open)
closesocket (a->sock);
xfree (a); /* we can free our context now */
}
return rc;
}
#endif /*_WIN32*/
/****************
* This is used to implement the block write mode.
* Block reading is done on a byte by byte basis in readbyte(),
* without a filter
*/
static int
block_filter(void *opaque, int control, IOBUF chain, byte *buf, size_t *ret_len)
{
block_filter_ctx_t *a = opaque;
size_t size = *ret_len;
int c, needed, rc = 0;
char *p;
if( control == IOBUFCTRL_UNDERFLOW ) {
size_t n=0;
p = buf;
assert( size ); /* need a buffer */
if( a->eof ) /* don't read any further */
rc = -1;
while( !rc && size ) {
if( !a->size ) { /* get the length bytes */
if( a->partial == 2 ) {
a->eof = 1;
if( !n )
rc = -1;
break;
}
else if( a->partial ) {
/* These OpenPGP introduced huffman like encoded length
* bytes are really a mess :-( */
if( a->first_c ) {
c = a->first_c;
a->first_c = 0;
}
else if( (c = iobuf_get(chain)) == -1 ) {
log_error("block_filter: 1st length byte missing\n");
rc = G10ERR_READ_FILE;
break;
}
if( c < 192 ) {
a->size = c;
a->partial = 2;
if( !a->size ) {
a->eof = 1;
if( !n )
rc = -1;
break;
}
}
else if( c < 224 ) {
a->size = (c - 192) * 256;
if( (c = iobuf_get(chain)) == -1 ) {
log_error("block_filter: 2nd length byte missing\n");
rc = G10ERR_READ_FILE;
break;
}
a->size += c + 192;
a->partial = 2;
if( !a->size ) {
a->eof = 1;
if( !n )
rc = -1;
break;
}
}
else if( c == 255 ) {
a->size = (size_t)iobuf_get(chain) << 24;
a->size |= iobuf_get(chain) << 16;
a->size |= iobuf_get(chain) << 8;
if( (c = iobuf_get(chain)) == -1 ) {
log_error("block_filter: invalid 4 byte length\n");
rc = G10ERR_READ_FILE;
break;
}
a->size |= c;
a->partial = 2;
if( !a->size ) {
a->eof = 1;
if( !n )
rc = -1;
break;
}
}
else { /* next partial body length */
a->size = 1 << (c & 0x1f);
}
/* log_debug("partial: ctx=%p c=%02x size=%u\n", a, c, a->size);*/
}
else
BUG();
}
while( !rc && size && a->size ) {
needed = size < a->size ? size : a->size;
c = iobuf_read( chain, p, needed );
if( c < needed ) {
if( c == -1 ) c = 0;
log_error("block_filter %p: read error (size=%lu,a->size=%lu)\n",
a, (ulong)size+c, (ulong)a->size+c);
rc = G10ERR_READ_FILE;
}
else {
size -= c;
a->size -= c;
p += c;
n += c;
}
}
}
*ret_len = n;
}
else if( control == IOBUFCTRL_FLUSH ) {
if( a->partial ) { /* the complicated openpgp scheme */
size_t blen, n, nbytes = size + a->buflen;
assert( a->buflen <= OP_MIN_PARTIAL_CHUNK );
if( nbytes < OP_MIN_PARTIAL_CHUNK ) {
/* not enough to write a partial block out; so we store it*/
if( !a->buffer )
a->buffer = xmalloc( OP_MIN_PARTIAL_CHUNK );
memcpy( a->buffer + a->buflen, buf, size );
a->buflen += size;
}
else { /* okay, we can write out something */
/* do this in a loop to use the most efficient block lengths */
p = buf;
do {
/* find the best matching block length - this is limited
* by the size of the internal buffering */
for( blen=OP_MIN_PARTIAL_CHUNK*2,
c=OP_MIN_PARTIAL_CHUNK_2POW+1; blen <= nbytes;
blen *=2, c++ )
;
blen /= 2; c--;
/* write the partial length header */
assert( c <= 0x1f ); /*;-)*/
c |= 0xe0;
iobuf_put( chain, c );
if( (n=a->buflen) ) { /* write stuff from the buffer */
assert( n == OP_MIN_PARTIAL_CHUNK);
if( iobuf_write(chain, a->buffer, n ) )
rc = G10ERR_WRITE_FILE;
a->buflen = 0;
nbytes -= n;
}
if( (n = nbytes) > blen )
n = blen;
if( n && iobuf_write(chain, p, n ) )
rc = G10ERR_WRITE_FILE;
p += n;
nbytes -= n;
} while( !rc && nbytes >= OP_MIN_PARTIAL_CHUNK );
/* store the rest in the buffer */
if( !rc && nbytes ) {
assert( !a->buflen );
assert( nbytes < OP_MIN_PARTIAL_CHUNK );
if( !a->buffer )
a->buffer = xmalloc( OP_MIN_PARTIAL_CHUNK );
memcpy( a->buffer, p, nbytes );
a->buflen = nbytes;
}
}
}
else
BUG();
}
else if( control == IOBUFCTRL_INIT ) {
if( DBG_IOBUF )
log_debug("init block_filter %p\n", a );
if( a->partial )
a->count = 0;
else if( a->use == 1 )
a->count = a->size = 0;
else
a->count = a->size; /* force first length bytes */
a->eof = 0;
a->buffer = NULL;
a->buflen = 0;
}
else if( control == IOBUFCTRL_DESC ) {
mem2str (buf, "block_filter", *ret_len);
}
else if( control == IOBUFCTRL_FREE ) {
if( a->use == 2 ) { /* write the end markers */
if( a->partial ) {
u32 len;
/* write out the remaining bytes without a partial header
* the length of this header may be 0 - but if it is
* the first block we are not allowed to use a partial header
* and frankly we can't do so, because this length must be
* a power of 2. This is _really_ complicated because we
* have to check the possible length of a packet prior
* to it's creation: a chain of filters becomes complicated
* and we need a lot of code to handle compressed packets etc.
* :-(((((((
*/
/* construct header */
len = a->buflen;
/*log_debug("partial: remaining length=%u\n", len );*/
if( len < 192 )
rc = iobuf_put(chain, len );
else if( len < 8384 ) {
if( !(rc=iobuf_put( chain, ((len-192) / 256) + 192)) )
rc = iobuf_put( chain, ((len-192) % 256));
}
else { /* use a 4 byte header */
if( !(rc=iobuf_put( chain, 0xff )) )
if( !(rc=iobuf_put( chain, (len >> 24)&0xff )) )
if( !(rc=iobuf_put( chain, (len >> 16)&0xff )) )
if( !(rc=iobuf_put( chain, (len >> 8)&0xff )))
rc=iobuf_put( chain, len & 0xff );
}
if( !rc && len )
rc = iobuf_write(chain, a->buffer, len );
if( rc ) {
log_error("block_filter: write error: %s\n",strerror(errno));
rc = G10ERR_WRITE_FILE;
}
xfree( a->buffer ); a->buffer = NULL; a->buflen = 0;
}
else
BUG();
}
else if( a->size ) {
log_error("block_filter: pending bytes!\n");
}
if( DBG_IOBUF )
log_debug("free block_filter %p\n", a );
xfree(a); /* we can free our context now */
}
return rc;
}
#define MAX_IOBUF_DESC 32
/*
* Fill the buffer by the description of iobuf A.
* The buffer size should be MAX_IOBUF_DESC (or larger).
* Returns BUF as (const char *).
*/
static const char *
iobuf_desc (iobuf_t a, byte *buf)
{
size_t len = MAX_IOBUF_DESC;
if (! a || ! a->filter)
memcpy (buf, "?", 2);
else
a->filter (a->filter_ov, IOBUFCTRL_DESC, NULL, buf, &len);
return buf;
}
static void
print_chain( IOBUF a )
{
if( !DBG_IOBUF )
return;
for(; a; a = a->chain ) {
byte desc[MAX_IOBUF_DESC];
log_debug("iobuf chain: %d.%d `%s' filter_eof=%d start=%d len=%d\n",
a->no, a->subno, iobuf_desc (a, desc), a->filter_eof,
(int)a->d.start, (int)a->d.len );
}
}
int
iobuf_print_chain( IOBUF a )
{
print_chain(a);
return 0;
}
/****************
* Allocate a new io buffer, with no function assigned.
* Use is the desired usage: 1 for input, 2 for output, 3 for temp buffer
* BUFSIZE is a suggested buffer size.
*/
IOBUF
iobuf_alloc(int use, size_t bufsize)
{
IOBUF a;
static int number=0;
a = xmalloc_clear(sizeof *a);
a->use = use;
a->d.buf = xmalloc( bufsize );
a->d.size = bufsize;
a->no = ++number;
a->subno = 0;
a->opaque = NULL;
a->real_fname = NULL;
return a;
}
int
iobuf_close ( IOBUF a )
{
IOBUF a2;
size_t dummy_len=0;
int rc=0;
if( a && a->directfp ) {
fclose( a->directfp );
xfree( a->real_fname );
if( DBG_IOBUF )
log_debug("iobuf_close -> %p\n", a->directfp );
return 0;
}
for( ; a && !rc ; a = a2 ) {
byte desc[MAX_IOBUF_DESC];
a2 = a->chain;
if( a->use == 2 && (rc=iobuf_flush(a)) )
log_error("iobuf_flush failed on close: %s\n", g10_errstr(rc));
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: close `%s'\n", a->no, a->subno,
iobuf_desc (a, desc));
if( a->filter && (rc = a->filter(a->filter_ov, IOBUFCTRL_FREE,
a->chain, NULL, &dummy_len)) )
log_error("IOBUFCTRL_FREE failed on close: %s\n", g10_errstr(rc) );
xfree(a->real_fname);
if (a->d.buf) {
memset (a->d.buf, 0, a->d.size); /* erase the buffer */
xfree(a->d.buf);
}
xfree(a);
}
return rc;
}
int
iobuf_cancel( IOBUF a )
{
const char *s;
IOBUF a2;
int rc;
#if defined(HAVE_DOSISH_SYSTEM) || defined(__riscos__)
char *remove_name = NULL;
#endif
if( a && a->use == 2 ) {
s = iobuf_get_real_fname(a);
if( s && *s ) {
#if defined(HAVE_DOSISH_SYSTEM) || defined(__riscos__)
remove_name = xstrdup ( s );
#else
remove(s);
#endif
}
}
/* send a cancel message to all filters */
for( a2 = a; a2 ; a2 = a2->chain ) {
size_t dummy;
if( a2->filter )
a2->filter( a2->filter_ov, IOBUFCTRL_CANCEL, a2->chain,
NULL, &dummy );
}
rc = iobuf_close(a);
#if defined(HAVE_DOSISH_SYSTEM) || defined(__riscos__)
if ( remove_name ) {
/* Argg, MSDOS does not allow to remove open files. So
* we have to do it here */
remove ( remove_name );
xfree ( remove_name );
}
#endif
return rc;
}
/****************
* create a temporary iobuf, which can be used to collect stuff
* in an iobuf and later be written by iobuf_write_temp() to another
* iobuf.
*/
IOBUF
iobuf_temp()
{
IOBUF a;
a = iobuf_alloc(3, IOBUF_BUFFER_SIZE );
return a;
}
IOBUF
iobuf_temp_with_content( const char *buffer, size_t length )
{
IOBUF a;
a = iobuf_alloc(3, length );
memcpy( a->d.buf, buffer, length );
a->d.len = length;
return a;
}
void
iobuf_enable_special_filenames ( int yes )
{
special_names_enabled = yes;
}
/*
* see whether the filename has the for "-&nnnn", where n is a
* non-zero number.
* Returns this number or -1 if it is not the case.
*/
static int
check_special_filename ( const char *fname )
{
if ( special_names_enabled
&& fname && *fname == '-' && fname[1] == '&' ) {
int i;
fname += 2;
for (i=0; digitp (fname+i); i++ )
;
if ( !fname[i] )
return atoi (fname);
}
return -1;
}
/* This fucntion returns true if FNAME indicates a PIPE (stdout or
stderr) or a special file name if those are enabled. */
int
iobuf_is_pipe_filename (const char *fname)
{
if (!fname || (*fname=='-' && !fname[1]) )
return 1;
return check_special_filename (fname) != -1;
}
/****************
* Create a head iobuf for reading from a file
* returns: NULL if an error occures and sets errno
*/
IOBUF
iobuf_open( const char *fname )
{
IOBUF a;
FILEP_OR_FD fp;
file_filter_ctx_t *fcx;
size_t len = 0;
int print_only = 0;
int fd;
if( !fname || (*fname=='-' && !fname[1]) ) {
fp = FILEP_OR_FD_FOR_STDIN;
#ifdef USE_SETMODE
setmode ( my_fileno(fp) , O_BINARY );
#endif
fname = "[stdin]";
print_only = 1;
}
else if ( (fd = check_special_filename ( fname )) != -1 )
return iobuf_fdopen ( translate_file_handle (fd,0), "rb" );
else if( (fp = my_fopen_ro(fname, "rb")) == INVALID_FP )
return NULL;
a = iobuf_alloc(1, IOBUF_BUFFER_SIZE );
fcx = xmalloc( sizeof *fcx + strlen(fname) );
fcx->fp = fp;
fcx->print_only_name = print_only;
strcpy(fcx->fname, fname );
if( !print_only )
a->real_fname = xstrdup( fname );
a->filter = file_filter;
a->filter_ov = fcx;
file_filter( fcx, IOBUFCTRL_INIT, NULL, NULL, &len );
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: open `%s' fd=%d\n",
a->no, a->subno, fname, (int)my_fileno(fcx->fp) );
return a;
}
/****************
* Create a head iobuf for reading from a file
* returns: NULL if an error occures and sets errno
*/
IOBUF
iobuf_fdopen( int fd, const char *mode )
{
IOBUF a;
FILEP_OR_FD fp;
file_filter_ctx_t *fcx;
size_t len;
#ifdef FILE_FILTER_USES_STDIO
if( !(fp = fdopen(fd, mode)) )
return NULL;
#else
fp = (FILEP_OR_FD)fd;
#endif
a = iobuf_alloc( strchr( mode, 'w')? 2:1, IOBUF_BUFFER_SIZE );
fcx = xmalloc( sizeof *fcx + 20 );
fcx->fp = fp;
fcx->print_only_name = 1;
sprintf(fcx->fname, "[fd %d]", fd );
a->filter = file_filter;
a->filter_ov = fcx;
file_filter( fcx, IOBUFCTRL_INIT, NULL, NULL, &len );
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: fdopen `%s'\n", a->no, a->subno, fcx->fname );
iobuf_ioctl (a,3,1,NULL); /* disable fd caching */
return a;
}
IOBUF
iobuf_sockopen ( int fd, const char *mode )
{
IOBUF a;
#ifdef _WIN32
sock_filter_ctx_t *scx;
size_t len;
a = iobuf_alloc( strchr( mode, 'w')? 2:1, IOBUF_BUFFER_SIZE );
scx = xmalloc( sizeof *scx + 25 );
scx->sock = fd;
scx->print_only_name = 1;
sprintf(scx->fname, "[sock %d]", fd );
a->filter = sock_filter;
a->filter_ov = scx;
sock_filter( scx, IOBUFCTRL_INIT, NULL, NULL, &len );
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: sockopen `%s'\n", a->no, a->subno, scx->fname);
iobuf_ioctl (a,3,1,NULL); /* disable fd caching */
#else
a = iobuf_fdopen (fd, mode);
#endif
return a;
}
/****************
* create an iobuf for writing to a file; the file will be created.
*/
IOBUF
iobuf_create( const char *fname )
{
IOBUF a;
FILEP_OR_FD fp;
file_filter_ctx_t *fcx;
size_t len;
int print_only = 0;
int fd;
byte desc[MAX_IOBUF_DESC];
if( !fname || (*fname=='-' && !fname[1]) ) {
fp = FILEP_OR_FD_FOR_STDOUT;
#ifdef USE_SETMODE
setmode ( my_fileno(fp) , O_BINARY );
#endif
fname = "[stdout]";
print_only = 1;
}
else if ( (fd = check_special_filename ( fname )) != -1 )
return iobuf_fdopen ( translate_file_handle (fd, 1), "wb" );
else if( (fp = my_fopen(fname, "wb")) == INVALID_FP )
return NULL;
a = iobuf_alloc(2, IOBUF_BUFFER_SIZE );
fcx = xmalloc( sizeof *fcx + strlen(fname) );
fcx->fp = fp;
fcx->print_only_name = print_only;
strcpy(fcx->fname, fname );
if( !print_only )
a->real_fname = xstrdup( fname );
a->filter = file_filter;
a->filter_ov = fcx;
file_filter( fcx, IOBUFCTRL_INIT, NULL, NULL, &len );
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: create `%s'\n", a->no, a->subno,
iobuf_desc (a, desc));
return a;
}
/****************
* append to an iobuf; if the file does not exist, create it.
* cannot be used for stdout.
* Note: This is not used.
*/
#if 0 /* not used */
IOBUF
iobuf_append( const char *fname )
{
IOBUF a;
FILE *fp;
file_filter_ctx_t *fcx;
size_t len;
byte desc[MAX_IOBUF_DESC];
if( !fname )
return NULL;
else if( !(fp = my_fopen(fname, "ab")) )
return NULL;
a = iobuf_alloc(2, IOBUF_BUFFER_SIZE );
fcx = xmalloc( sizeof *fcx + strlen(fname) );
fcx->fp = fp;
strcpy(fcx->fname, fname );
a->real_fname = xstrdup( fname );
a->filter = file_filter;
a->filter_ov = fcx;
file_filter( fcx, IOBUFCTRL_INIT, NULL, NULL, &len );
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: append `%s'\n", a->no, a->subno,
iobuf_desc (a, desc));
return a;
}
#endif
IOBUF
iobuf_openrw( const char *fname )
{
IOBUF a;
FILEP_OR_FD fp;
file_filter_ctx_t *fcx;
size_t len;
byte desc[MAX_IOBUF_DESC];
if( !fname )
return NULL;
else if( (fp = my_fopen(fname, "r+b")) == INVALID_FP )
return NULL;
a = iobuf_alloc(2, IOBUF_BUFFER_SIZE );
fcx = xmalloc( sizeof *fcx + strlen(fname) );
fcx->fp = fp;
strcpy(fcx->fname, fname );
a->real_fname = xstrdup( fname );
a->filter = file_filter;
a->filter_ov = fcx;
file_filter( fcx, IOBUFCTRL_INIT, NULL, NULL, &len );
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: openrw `%s'\n", a->no, a->subno,
iobuf_desc (a, desc));
return a;
}
int
iobuf_ioctl ( IOBUF a, int cmd, int intval, void *ptrval )
{
byte desc[MAX_IOBUF_DESC];
if ( cmd == 1 ) { /* keep system filepointer/descriptor open */
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: ioctl `%s' keep=%d\n",
a? a->no:-1, a?a->subno:-1,
iobuf_desc (a, desc), intval );
for( ; a; a = a->chain )
if( !a->chain && a->filter == file_filter ) {
file_filter_ctx_t *b = a->filter_ov;
b->keep_open = intval;
return 0;
}
#ifdef _WIN32
else if( !a->chain && a->filter == sock_filter ) {
sock_filter_ctx_t *b = a->filter_ov;
b->keep_open = intval;
return 0;
}
#endif
}
else if ( cmd == 2 ) { /* invalidate cache */
if( DBG_IOBUF )
log_debug("iobuf-*.*: ioctl `%s' invalidate\n",
ptrval? (char*)ptrval:"[all]");
if ( !a && !intval ) {
#ifndef FILE_FILTER_USES_STDIO
return fd_cache_invalidate (ptrval);
#endif
return 0;
}
}
else if ( cmd == 3 ) { /* disallow/allow caching */
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: ioctl `%s' no_cache=%d\n",
a? a->no:-1, a?a->subno:-1,
iobuf_desc (a, desc), intval );
for( ; a; a = a->chain )
if( !a->chain && a->filter == file_filter ) {
file_filter_ctx_t *b = a->filter_ov;
b->no_cache = intval;
return 0;
}
#ifdef _WIN32
else if( !a->chain && a->filter == sock_filter ) {
sock_filter_ctx_t *b = a->filter_ov;
b->no_cache = intval;
return 0;
}
#endif
}
else if(cmd==4)
{
/* Do a fsync on the open fd and return any errors to the
caller of iobuf_ioctl */
if( DBG_IOBUF )
log_debug("iobuf-*.*: ioctl `%s' fsync\n",
ptrval? (char*)ptrval:"<null>");
if(!a && !intval && ptrval)
{
#ifndef FILE_FILTER_USES_STDIO
return fd_cache_synchronize (ptrval);
#else
return 0;
#endif
}
}
return -1;
}
/****************
* Register an i/o filter.
*/
int
iobuf_push_filter( IOBUF a,
int (*f)(void *opaque, int control,
IOBUF chain, byte *buf, size_t *len), void *ov )
{
return iobuf_push_filter2( a, f, ov, 0 );
}
int
iobuf_push_filter2( IOBUF a,
int (*f)(void *opaque, int control,
IOBUF chain, byte *buf, size_t *len),
void *ov, int rel_ov )
{
IOBUF b;
size_t dummy_len=0;
int rc=0;
if( a->directfp )
BUG();
if( a->use == 2 && (rc=iobuf_flush(a)) )
return rc;
if (a->subno >= MAX_NESTING_FILTER) {
log_error ("i/o filter too deeply nested - corrupted data?\n");
return G10ERR_UNEXPECTED;
}
/* make a copy of the current stream, so that
* A is the new stream and B the original one.
* The contents of the buffers are transferred to the
* new stream.
*/
b = xmalloc(sizeof *b);
memcpy(b, a, sizeof *b );
/* fixme: it is stupid to keep a copy of the name at every level
* but we need the name somewhere because the name known by file_filter
* may have been released when we need the name of the file */
b->real_fname = a->real_fname? xstrdup(a->real_fname):NULL;
/* remove the filter stuff from the new stream */
a->filter = NULL;
a->filter_ov = NULL;
a->filter_ov_owner = 0;
a->filter_eof = 0;
if( a->use == 3 )
a->use = 2; /* make a write stream from a temp stream */
if( a->use == 2 ) { /* allocate a fresh buffer for the original stream */
b->d.buf = xmalloc( a->d.size );
b->d.len = 0;
b->d.start = 0;
}
else { /* allocate a fresh buffer for the new stream */
a->d.buf = xmalloc( a->d.size );
a->d.len = 0;
a->d.start = 0;
}
/* disable nlimit for the new stream */
a->ntotal = b->ntotal + b->nbytes;
a->nlimit = a->nbytes = 0;
a->nofast &= ~1;
/* make a link from the new stream to the original stream */
a->chain = b;
a->opaque = b->opaque;
/* setup the function on the new stream */
a->filter = f;
a->filter_ov = ov;
a->filter_ov_owner = rel_ov;
a->subno = b->subno + 1;
if( DBG_IOBUF ) {
byte desc[MAX_IOBUF_DESC];
log_debug("iobuf-%d.%d: push `%s'\n", a->no, a->subno,
iobuf_desc (a, desc));
print_chain( a );
}
/* now we can initialize the new function if we have one */
if( a->filter && (rc = a->filter(a->filter_ov, IOBUFCTRL_INIT, a->chain,
NULL, &dummy_len)) )
log_error("IOBUFCTRL_INIT failed: %s\n", g10_errstr(rc) );
return rc;
}
/****************
* Remove an i/o filter.
*/
static int
pop_filter( IOBUF a, int (*f)(void *opaque, int control,
IOBUF chain, byte *buf, size_t *len), void *ov )
{
IOBUF b;
size_t dummy_len=0;
int rc=0;
byte desc[MAX_IOBUF_DESC];
if( a->directfp )
BUG();
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: pop `%s'\n", a->no, a->subno,
iobuf_desc (a, desc));
if( !a->filter ) { /* this is simple */
b = a->chain;
assert(b);
xfree(a->d.buf);
xfree(a->real_fname);
memcpy(a,b, sizeof *a);
xfree(b);
return 0;
}
for(b=a ; b; b = b->chain )
if( b->filter == f && (!ov || b->filter_ov == ov) )
break;
if( !b )
log_bug("pop_filter(): filter function not found\n");
/* flush this stream if it is an output stream */
if( a->use == 2 && (rc=iobuf_flush(b)) ) {
log_error("iobuf_flush failed in pop_filter: %s\n", g10_errstr(rc));
return rc;
}
/* and tell the filter to free it self */
if( b->filter && (rc = b->filter(b->filter_ov, IOBUFCTRL_FREE, b->chain,
NULL, &dummy_len)) ) {
log_error("IOBUFCTRL_FREE failed: %s\n", g10_errstr(rc) );
return rc;
}
if( b->filter_ov && b->filter_ov_owner ) {
xfree( b->filter_ov );
b->filter_ov = NULL;
}
/* and see how to remove it */
if( a == b && !b->chain )
log_bug("can't remove the last filter from the chain\n");
else if( a == b ) { /* remove the first iobuf from the chain */
/* everything from b is copied to a. This is save because
* a flush has been done on the to be removed entry
*/
b = a->chain;
xfree(a->d.buf);
xfree(a->real_fname);
memcpy(a,b, sizeof *a);
xfree(b);
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: popped filter\n", a->no, a->subno );
}
else if( !b->chain ) { /* remove the last iobuf from the chain */
log_bug("Ohh jeee, trying to remove a head filter\n");
}
else { /* remove an intermediate iobuf from the chain */
log_bug("Ohh jeee, trying to remove an intermediate filter\n");
}
return rc;
}
/****************
* read underflow: read more bytes into the buffer and return
* the first byte or -1 on EOF.
*/
static int
underflow(IOBUF a)
{
size_t len;
int rc;
assert( a->d.start == a->d.len );
if( a->use == 3 )
return -1; /* EOF because a temp buffer can't do an underflow */
if( a->filter_eof ) {
if( a->chain ) {
byte desc[MAX_IOBUF_DESC];
IOBUF b = a->chain;
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: pop `%s' in underflow\n",
a->no, a->subno, iobuf_desc (a, desc) );
xfree(a->d.buf);
xfree(a->real_fname);
memcpy(a, b, sizeof *a);
xfree(b);
print_chain(a);
}
else
a->filter_eof = 0; /* for the top level filter */
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: underflow: eof (due to filter eof)\n",
a->no, a->subno );
return -1; /* return one(!) EOF */
}
if( a->error ) {
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: error\n", a->no, a->subno );
return -1;
}
if( a->directfp ) {
FILE *fp = a->directfp;
len = fread( a->d.buf, 1, a->d.size, fp);
if( len < a->d.size ) {
if( ferror(fp) )
a->error = 1;
}
a->d.len = len;
a->d.start = 0;
return len? a->d.buf[a->d.start++] : -1;
}
if( a->filter ) {
len = a->d.size;
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: underflow: req=%lu\n",
a->no, a->subno, (ulong)len );
rc = a->filter( a->filter_ov, IOBUFCTRL_UNDERFLOW, a->chain,
a->d.buf, &len );
if( DBG_IOBUF ) {
log_debug("iobuf-%d.%d: underflow: got=%lu rc=%d\n",
a->no, a->subno, (ulong)len, rc );
/* if( a->no == 1 ) */
/* log_hexdump (" data:", a->d.buf, len); */
}
if( a->use == 1 && rc == -1 ) { /* EOF: we can remove the filter */
size_t dummy_len=0;
/* and tell the filter to free itself */
if( (rc = a->filter(a->filter_ov, IOBUFCTRL_FREE, a->chain,
NULL, &dummy_len)) )
log_error("IOBUFCTRL_FREE failed: %s\n", g10_errstr(rc) );
if( a->filter_ov && a->filter_ov_owner ) {
xfree( a->filter_ov );
a->filter_ov = NULL;
}
a->filter = NULL;
a->filter_ov = NULL;
a->filter_eof = 1;
if( !len && a->chain ) {
IOBUF b = a->chain;
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: pop in underflow (!len)\n",
a->no, a->subno);
xfree(a->d.buf);
xfree(a->real_fname);
memcpy(a,b, sizeof *a);
xfree(b);
print_chain(a);
}
}
else if( rc )
a->error = 1;
if( !len ) {
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: underflow: eof\n", a->no, a->subno );
return -1;
}
a->d.len = len;
a->d.start = 0;
return a->d.buf[a->d.start++];
}
else {
if( DBG_IOBUF )
log_debug("iobuf-%d.%d: underflow: eof (no filter)\n",
a->no, a->subno );
return -1; /* no filter; return EOF */
}
}
int
iobuf_flush(IOBUF a)
{
size_t len;
int rc;
if( a->directfp )
return 0;
if( a->use == 3 ) { /* increase the temp buffer */
char *newbuf;
size_t newsize = a->d.size + IOBUF_BUFFER_SIZE;
if( DBG_IOBUF )
log_debug("increasing temp iobuf from %lu to %lu\n",
(ulong)a->d.size, (ulong)newsize );
newbuf = xmalloc( newsize );
memcpy( newbuf, a->d.buf, a->d.len );
xfree(a->d.buf);
a->d.buf = newbuf;
a->d.size = newsize;
return 0;
}
else if( a->use != 2 )
log_bug("flush on non-output iobuf\n");
else if( !a->filter )
log_bug("iobuf_flush: no filter\n");
len = a->d.len;
rc = a->filter( a->filter_ov, IOBUFCTRL_FLUSH, a->chain, a->d.buf, &len );
if( !rc && len != a->d.len ) {
log_info("iobuf_flush did not write all!\n");
rc = G10ERR_WRITE_FILE;
}
else if( rc )
a->error = 1;
a->d.len = 0;
return rc;
}
/****************
* Read a byte from the iobuf; returns -1 on EOF
*/
int
iobuf_readbyte(IOBUF a)
{
int c;
/* nlimit does not work together with unget */
/* nbytes is also not valid! */
if( a->unget.buf ) {
if( a->unget.start < a->unget.len )
return a->unget.buf[a->unget.start++];
xfree(a->unget.buf);
a->unget.buf = NULL;
a->nofast &= ~2;
}
if( a->nlimit && a->nbytes >= a->nlimit )
return -1; /* forced EOF */
if( a->d.start < a->d.len ) {
c = a->d.buf[a->d.start++];
}
else if( (c=underflow(a)) == -1 )
return -1; /* EOF */
a->nbytes++;
return c;
}
int
iobuf_read(IOBUF a, byte *buf, unsigned buflen )
{
int c, n;
if( a->unget.buf || a->nlimit ) {
/* handle special cases */
for(n=0 ; n < buflen; n++ ) {
if( (c = iobuf_readbyte(a)) == -1 ) {
if( !n )
return -1; /* eof */
break;
}
else
if( buf ) *buf = c;
if( buf ) buf++;
}
return n;
}
n = 0;
do {
if( n < buflen && a->d.start < a->d.len ) {
unsigned size = a->d.len - a->d.start;
if( size > buflen - n )
size = buflen - n;
if( buf )
memcpy( buf, a->d.buf + a->d.start, size );
n += size;
a->d.start += size;
if( buf )
buf += size;
}
if( n < buflen ) {
if( (c=underflow(a)) == -1 ) {
a->nbytes += n;
return n? n : -1/*EOF*/;
}
if( buf )
*buf++ = c;
n++;
}
} while( n < buflen );
a->nbytes += n;
return n;
}
/****************
* Have a look at the iobuf.
* NOTE: This only works in special cases.
*/
int
iobuf_peek(IOBUF a, byte *buf, unsigned buflen )
{
int n=0;
if( a->filter_eof )
return -1;
if( !(a->d.start < a->d.len) ) {
if( underflow(a) == -1 )
return -1;
/* and unget this character */
assert(a->d.start == 1);
a->d.start = 0;
}
for(n=0 ; n < buflen && (a->d.start+n) < a->d.len ; n++, buf++ )
*buf = a->d.buf[n];
return n;
}
int
iobuf_writebyte(IOBUF a, unsigned c)
{
if( a->directfp )
BUG();
if( a->d.len == a->d.size )
if( iobuf_flush(a) )
return -1;
assert( a->d.len < a->d.size );
a->d.buf[a->d.len++] = c;
return 0;
}
int
iobuf_write(IOBUF a, byte *buf, unsigned buflen )
{
if( a->directfp )
BUG();
do {
if( buflen && a->d.len < a->d.size ) {
unsigned size = a->d.size - a->d.len;
if( size > buflen ) size = buflen;
memcpy( a->d.buf + a->d.len, buf, size );
buflen -= size;
buf += size;
a->d.len += size;
}
if( buflen ) {
if( iobuf_flush(a) )
return -1;
}
} while( buflen );
return 0;
}
int
iobuf_writestr(IOBUF a, const char *buf )
{
for( ; *buf; buf++ )
if( iobuf_writebyte(a, *buf) )
return -1;
return 0;
}
/****************
* copy the contents of TEMP to A.
*/
int
iobuf_write_temp( IOBUF a, IOBUF temp )
{
while( temp->chain )
pop_filter( temp, temp->filter, NULL );
return iobuf_write(a, temp->d.buf, temp->d.len );
}
/****************
* copy the contents of the temp io stream to BUFFER.
*/
size_t
iobuf_temp_to_buffer( IOBUF a, byte *buffer, size_t buflen )
{
size_t n = a->d.len;
if( n > buflen )
n = buflen;
memcpy( buffer, a->d.buf, n );
return n;
}
/****************
* Call this function to terminate processing of the temp stream
* without closing it. This removes all filters from the stream
* makes sure that iobuf_get_temp_{buffer,length}() returns correct
* values.
*/
void
iobuf_flush_temp( IOBUF temp )
{
while( temp->chain )
pop_filter( temp, temp->filter, NULL );
}
/****************
* Set a limit on how many bytes may be read from the input stream A.
* Setting the limit to 0 disables this feature.
*/
void
iobuf_set_limit( IOBUF a, off_t nlimit )
{
if( nlimit )
a->nofast |= 1;
else
a->nofast &= ~1;
a->nlimit = nlimit;
a->ntotal += a->nbytes;
a->nbytes = 0;
}
/* Return the length of an open file A. IF OVERFLOW is not NULL it
will be set to true if the file is larger than what off_t can cope
with. The function return 0 on error or on overflow condition. */
off_t
iobuf_get_filelength (IOBUF a, int *overflow )
{
struct stat st;
if (overflow)
*overflow = 0;
if (a->directfp)
{
FILE *fp = a->directfp;
#ifdef __VMS
/* 2009-02-19 SMS.
* On VMS, use a VMS-specific method to determine file size.
* For some non-UNIX-like file formats, the fstat() result
* will not agree with the C Standard I/O functions such as
* getc() and fread(), so these must be detected and handled
* specially. */
return vms_file_size (fileno( fp));
#else /*!__VMS */
if( !fstat(fileno(fp), &st) )
return st.st_size;
log_error("fstat() failed: %s\n", strerror(errno) );
return 0;
#endif /*!__VMS */
}
/* Hmmm: file_filter may have already been removed */
for( ; a; a = a->chain )
if( !a->chain && a->filter == file_filter ) {
file_filter_ctx_t *b = a->filter_ov;
FILEP_OR_FD fp = b->fp;
#if defined(HAVE_DOSISH_SYSTEM) && !defined(FILE_FILTER_USES_STDIO)
ulong size;
static int (* __stdcall get_file_size_ex)
(void *handle, LARGE_INTEGER *size);
static int get_file_size_ex_initialized;
if (!get_file_size_ex_initialized)
{
void *handle;
handle = dlopen ("kernel32.dll", RTLD_LAZY);
if (handle)
{
get_file_size_ex = dlsym (handle, "GetFileSizeEx");
if (!get_file_size_ex)
dlclose (handle);
}
get_file_size_ex_initialized = 1;
}
if (get_file_size_ex)
{
/* This is a newer system with GetFileSizeEx; we use
this then becuase it seem that GetFileSize won't
return a proper error in case a file is larger than
4GB. */
LARGE_INTEGER size;
if (get_file_size_ex (fp, &size))
{
if (!size.u.HighPart)
return size.u.LowPart;
if (overflow)
*overflow = 1;
return 0;
}
}
else
{
if ((size=GetFileSize (fp, NULL)) != 0xffffffff)
return size;
}
log_error ("GetFileSize for handle %p failed: %s\n",
fp, w32_strerror (0));
#elif defined(__VMS)
return vms_file_size (my_fileno (fp));
#else
if( !fstat(my_fileno(fp), &st) )
return st.st_size;
log_error("fstat() failed: %s\n", strerror(errno) );
#endif
break;
}
return 0;
}
/* Return the file descriptor of the underlying file or -1 if it is
not available. */
int
iobuf_get_fd (IOBUF a)
{
if (a->directfp)
return fileno ( (FILE*)a->directfp );
for ( ; a; a = a->chain )
if (!a->chain && a->filter == file_filter)
{
file_filter_ctx_t *b = a->filter_ov;
FILEP_OR_FD fp = b->fp;
return my_fileno (fp);
}
return -1;
}
/****************
* Tell the file position, where the next read will take place
*/
off_t
iobuf_tell( IOBUF a )
{
return a->ntotal + a->nbytes;
}
#if !defined(HAVE_FSEEKO) && !defined(fseeko)
#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
#ifndef LONG_MAX
# define LONG_MAX ((long) ((unsigned long) -1 >> 1))
#endif
#ifndef LONG_MIN
# define LONG_MIN (-1 - LONG_MAX)
#endif
/****************
* A substitute for fseeko, for hosts that don't have it.
*/
static int
fseeko( FILE *stream, off_t newpos, int whence )
{
while( newpos != (long) newpos ) {
long pos = newpos < 0 ? LONG_MIN : LONG_MAX;
if( fseek( stream, pos, whence ) != 0 )
return -1;
newpos -= pos;
whence = SEEK_CUR;
}
return fseek( stream, (long)newpos, whence );
}
#endif
/****************
* This is a very limited implementation. It simply discards all internal
* buffering and removes all filters but the first one.
*/
int
iobuf_seek( IOBUF a, off_t newpos )
{
file_filter_ctx_t *b = NULL;
if( a->directfp ) {
FILE *fp = a->directfp;
if( fseeko( fp, newpos, SEEK_SET ) ) {
log_error("can't seek: %s\n", strerror(errno) );
return -1;
}
clearerr(fp);
}
else {
for( ; a; a = a->chain ) {
if( !a->chain && a->filter == file_filter ) {
b = a->filter_ov;
break;
}
}
if( !a )
return -1;
#ifdef FILE_FILTER_USES_STDIO
if( fseeko( b->fp, newpos, SEEK_SET ) ) {
log_error("can't fseek: %s\n", strerror(errno) );
return -1;
}
#else
#ifdef HAVE_DOSISH_SYSTEM
if (SetFilePointer (b->fp, newpos, NULL, FILE_BEGIN) == 0xffffffff ) {
log_error ("SetFilePointer failed on handle %p: %s\n",
b->fp, w32_strerror (0));
return -1;
}
#else
if ( lseek (b->fp, newpos, SEEK_SET) == (off_t)-1 ) {
log_error("can't lseek: %s\n", strerror(errno) );
return -1;
}
#endif
#endif
}
a->d.len = 0; /* discard buffer */
a->d.start = 0;
a->nbytes = 0;
a->nlimit = 0;
a->nofast &= ~1;
a->ntotal = newpos;
a->error = 0;
/* remove filters, but the last */
if( a->chain )
log_debug("pop_filter called in iobuf_seek - please report\n");
while( a->chain )
pop_filter( a, a->filter, NULL );
return 0;
}
/****************
* Retrieve the real filename
*/
const char *
iobuf_get_real_fname( IOBUF a )
{
if( a->real_fname )
return a->real_fname;
/* the old solution */
for( ; a; a = a->chain )
if( !a->chain && a->filter == file_filter ) {
file_filter_ctx_t *b = a->filter_ov;
return b->print_only_name? NULL : b->fname;
}
return NULL;
}
/****************
* Retrieve the filename
*/
const char *
iobuf_get_fname( IOBUF a )
{
for( ; a; a = a->chain )
if( !a->chain && a->filter == file_filter ) {
file_filter_ctx_t *b = a->filter_ov;
return b->fname;
}
return NULL;
}
/****************
* enable partial block mode as described in the OpenPGP draft.
* LEN is the first length byte on read, but ignored on writes.
*/
void
iobuf_set_partial_block_mode( IOBUF a, size_t len )
{
block_filter_ctx_t *ctx = xmalloc_clear( sizeof *ctx );
assert( a->use == 1 || a->use == 2 );
ctx->use = a->use;
if( !len ) {
if( a->use == 1 )
log_debug("pop_filter called in set_partial_block_mode"
" - please report\n");
pop_filter(a, block_filter, NULL );
}
else {
ctx->partial = 1;
ctx->size = 0;
ctx->first_c = len;
iobuf_push_filter(a, block_filter, ctx );
}
}
/****************
* Same as fgets() but if the buffer is too short a larger one will
* be allocated up to some limit *max_length.
* A line is considered a byte stream ending in a LF.
* Returns the length of the line. EOF is indicated by a line of
* length zero. The last LF may be missing due to an EOF.
* is max_length is zero on return, the line has been truncated.
*
* Note: The buffer is allocated with enough space to append a CR,LF,EOL
*/
unsigned
iobuf_read_line( IOBUF a, byte **addr_of_buffer,
unsigned *length_of_buffer, unsigned *max_length )
{
int c;
char *buffer = *addr_of_buffer;
unsigned length = *length_of_buffer;
unsigned nbytes = 0;
unsigned maxlen = *max_length;
char *p;
if( !buffer ) { /* must allocate a new buffer */
length = 256;
buffer = xmalloc( length );
*addr_of_buffer = buffer;
*length_of_buffer = length;
}
length -= 3; /* reserve 3 bytes (cr,lf,eol) */
p = buffer;
while( (c=iobuf_get(a)) != -1 ) {
if( nbytes == length ) { /* increase the buffer */
if( length > maxlen ) { /* this is out limit */
/* skip the rest of the line */
while( c != '\n' && (c=iobuf_get(a)) != -1 )
;
*p++ = '\n'; /* always append a LF (we have reserved space) */
nbytes++;
*max_length = 0; /* indicate truncation */
break;
}
length += 3; /* correct for the reserved byte */
length += length < 1024? 256 : 1024;
buffer = xrealloc( buffer, length );
*addr_of_buffer = buffer;
*length_of_buffer = length;
length -= 3; /* and reserve again */
p = buffer + nbytes;
}
*p++ = c;
nbytes++;
if( c == '\n' )
break;
}
*p = 0; /* make sure the line is a string */
return nbytes;
}
/* This is the non iobuf specific function */
int
iobuf_translate_file_handle ( int fd, int for_write )
{
#ifdef _WIN32
{
int x;
if ( fd <= 2 )
return fd; /* do not do this for error, stdin, stdout, stderr */
x = _open_osfhandle ( fd, for_write? 1:0 );
if (x==-1 )
log_error ("failed to translate osfhandle %p\n", (void*)fd );
else {
/*log_info ("_open_osfhandle %p yields %d%s\n",
(void*)fd, x, for_write? " for writing":"" );*/
fd = x;
}
}
#endif
return fd;
}
static int
translate_file_handle ( int fd, int for_write )
{
#ifdef _WIN32
#ifdef FILE_FILTER_USES_STDIO
fd = iobuf_translate_file_handle (fd, for_write);
#else
{
int x;
if ( fd == 0 )
x = (int)GetStdHandle (STD_INPUT_HANDLE);
else if (fd == 1)
x = (int)GetStdHandle (STD_OUTPUT_HANDLE);
else if (fd == 2)
x = (int)GetStdHandle (STD_ERROR_HANDLE);
else
x = fd;
if (x == -1)
log_debug ("GetStdHandle(%d) failed: %s\n",
fd, w32_strerror (0));
fd = x;
}
#endif
#endif
return fd;
}
void
iobuf_skip_rest(IOBUF a, unsigned long n, int partial)
{
if ( partial ) {
for (;;) {
if (a->nofast || a->d.start >= a->d.len) {
if (iobuf_readbyte (a) == -1) {
break;
}
} else {
unsigned long count = a->d.len - a->d.start;
a->nbytes += count;
a->d.start = a->d.len;
}
}
} else {
unsigned long remaining = n;
while (remaining > 0) {
if (a->nofast || a->d.start >= a->d.len) {
if (iobuf_readbyte (a) == -1) {
break;
}
--remaining;
} else {
unsigned long count = a->d.len - a->d.start;
if (count > remaining) {
count = remaining;
}
a->nbytes += count;
a->d.start += count;
remaining -= count;
}
}
}
}
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