mirror of
git://git.gnupg.org/gnupg.git
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70f3a9bbb6
* Makefile.am (AM_CFLAGS): Add $(LIBASSUAN_CFLAGS). (t_common_ldadd): Add $(LIBASSUAN_LIBS). * sysutils.c: Include <assuan.h>. (translate_sys2libc_fd_int): Cast to silence gcc warning. * iobuf.c: Include <assuan.h> (translate_file_handle): Fix syntax error.
2453 lines
55 KiB
C
2453 lines
55 KiB
C
/* iobuf.c - File Handling for OpenPGP.
|
||
* Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2006, 2007, 2008,
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* 2009, 2010 Free Software Foundation, Inc.
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*
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||
* 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.
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||
*
|
||
* 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.
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*
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||
* You should have received a copy of the GNU General Public License
|
||
* along with this program; if not, see <http://www.gnu.org/licenses/>.
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||
*/
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#include <config.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 <errno.h>
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#include <ctype.h>
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#include <assert.h>
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||
#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#ifdef HAVE_W32_SYSTEM
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# include <windows.h>
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#endif
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#ifdef __riscos__
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# include <kernel.h>
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# include <swis.h>
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#endif /* __riscos__ */
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#include <assuan.h>
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#include "util.h"
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#include "sysutils.h"
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#include "iobuf.h"
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||
/*-- Begin configurable part. --*/
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/* The size of the internal buffers.
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NOTE: If you change this value you MUST also adjust the regression
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test "armored_key_8192" in armor.test! */
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#define IOBUF_BUFFER_SIZE 8192
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/*-- End configurable part. --*/
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#ifdef HAVE_W32_SYSTEM
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# ifdef HAVE_W32CE_SYSTEM
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# define FD_FOR_STDIN (es_fileno (es_stdin))
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# define FD_FOR_STDOUT (es_fileno (es_stdout))
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# else
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# define FD_FOR_STDIN (GetStdHandle (STD_INPUT_HANDLE))
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# define FD_FOR_STDOUT (GetStdHandle (STD_OUTPUT_HANDLE))
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# endif
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#else /*!HAVE_W32_SYSTEM*/
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# define FD_FOR_STDIN (0)
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# define FD_FOR_STDOUT (1)
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#endif /*!HAVE_W32_SYSTEM*/
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/* The context used by the file filter. */
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typedef struct
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{
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gnupg_fd_t fp; /* Open file pointer or handle. */
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int keep_open;
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int no_cache;
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int eof_seen;
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int print_only_name; /* Flags indicating that fname is not a real file. */
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char fname[1]; /* Name of the file. */
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} file_filter_ctx_t;
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/* Object to control the "close cache". */
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struct close_cache_s
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{
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struct close_cache_s *next;
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gnupg_fd_t fp;
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char fname[1];
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};
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typedef struct close_cache_s *close_cache_t;
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static close_cache_t close_cache;
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#ifdef HAVE_W32_SYSTEM
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typedef struct
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{
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int sock;
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int keep_open;
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int no_cache;
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int eof_seen;
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int print_only_name; /* Flag indicating that fname is not a real file. */
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char fname[1]; /* Name of the file */
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} sock_filter_ctx_t;
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#endif /*HAVE_W32_SYSTEM*/
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/* The first partial length header block must be of size 512
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* to make it easier (and efficienter) we use a min. block size of 512
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* for all chunks (but the last one) */
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#define OP_MIN_PARTIAL_CHUNK 512
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#define OP_MIN_PARTIAL_CHUNK_2POW 9
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/* The context we use for the block filter (used to handle OpenPGP
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length information header). */
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typedef struct
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{
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int use;
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size_t size;
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size_t count;
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int partial; /* 1 = partial header, 2 in last partial packet. */
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char *buffer; /* Used for partial header. */
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size_t buflen; /* Used size of buffer. */
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int first_c; /* First character of a partial header (which is > 0). */
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int eof;
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}
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block_filter_ctx_t;
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/* Global flag to tell whether special file names are enabled. See
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gpg.c for an explanation of these file names. FIXME: it does not
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belong into the iobuf subsystem. */
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static int special_names_enabled;
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/* Local prototypes. */
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static int underflow (iobuf_t a);
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static int translate_file_handle (int fd, int for_write);
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/* This is a replacement for strcmp. Under W32 it does not
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distinguish between backslash and slash. */
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static int
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fd_cache_strcmp (const char *a, const char *b)
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||
{
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#ifdef HAVE_DOSISH_SYSTEM
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for (; *a && *b; a++, b++)
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{
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if (*a != *b && !((*a == '/' && *b == '\\')
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|| (*a == '\\' && *b == '/')) )
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break;
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}
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return *(const unsigned char *)a - *(const unsigned char *)b;
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#else
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return strcmp (a, b);
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#endif
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}
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/*
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* Invalidate (i.e. close) a cached iobuf
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*/
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static int
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fd_cache_invalidate (const char *fname)
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{
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close_cache_t cc;
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int rc = 0;
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assert (fname);
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if (DBG_IOBUF)
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log_debug ("fd_cache_invalidate (%s)\n", fname);
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for (cc = close_cache; cc; cc = cc->next)
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{
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if (cc->fp != GNUPG_INVALID_FD && !fd_cache_strcmp (cc->fname, fname))
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{
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if (DBG_IOBUF)
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log_debug (" did (%s)\n", cc->fname);
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#ifdef HAVE_W32_SYSTEM
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if (!CloseHandle (cc->fp))
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rc = -1;
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#else
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rc = close (cc->fp);
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#endif
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cc->fp = GNUPG_INVALID_FD;
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}
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}
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return rc;
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}
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/* Try to sync changes to the disk. This is to avoid data loss during
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a system crash in write/close/rename cycle on some file
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systems. */
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static int
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fd_cache_synchronize (const char *fname)
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{
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int err = 0;
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#ifdef HAVE_FSYNC
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close_cache_t cc;
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if (DBG_IOBUF)
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log_debug ("fd_cache_synchronize (%s)\n", fname);
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for (cc=close_cache; cc; cc = cc->next )
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{
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if (cc->fp != GNUPG_INVALID_FD && !fd_cache_strcmp (cc->fname, fname))
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{
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if (DBG_IOBUF)
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log_debug (" did (%s)\n", cc->fname);
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err = fsync (cc->fp);
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}
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}
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#else
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(void)fname;
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#endif /*HAVE_FSYNC*/
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return err;
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}
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static gnupg_fd_t
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direct_open (const char *fname, const char *mode)
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{
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#ifdef HAVE_W32_SYSTEM
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unsigned long da, cd, sm;
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HANDLE hfile;
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/* Note, that we do not handle all mode combinations */
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/* According to the ReactOS source it seems that open() of the
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* standard MSW32 crt does open the file in shared mode which is
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* something new for MS applications ;-)
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*/
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if (strchr (mode, '+'))
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{
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if (fd_cache_invalidate (fname))
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return GNUPG_INVALID_FD;
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da = GENERIC_READ | GENERIC_WRITE;
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cd = OPEN_EXISTING;
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sm = FILE_SHARE_READ | FILE_SHARE_WRITE;
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}
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else if (strchr (mode, 'w'))
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{
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if (fd_cache_invalidate (fname))
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return GNUPG_INVALID_FD;
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da = GENERIC_WRITE;
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cd = CREATE_ALWAYS;
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sm = FILE_SHARE_WRITE;
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}
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else
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{
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da = GENERIC_READ;
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cd = OPEN_EXISTING;
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sm = FILE_SHARE_READ;
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}
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#ifdef HAVE_W32CE_SYSTEM
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{
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wchar_t *wfname = utf8_to_wchar (fname);
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if (wfname)
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{
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hfile = CreateFile (wfname, da, sm, NULL, cd,
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FILE_ATTRIBUTE_NORMAL, NULL);
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xfree (wfname);
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}
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else
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hfile = INVALID_HANDLE_VALUE;
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}
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#else
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hfile = CreateFile (fname, da, sm, NULL, cd, FILE_ATTRIBUTE_NORMAL, NULL);
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#endif
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return hfile;
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#else /*!HAVE_W32_SYSTEM*/
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int oflag;
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int cflag = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
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/* Note, that we do not handle all mode combinations */
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if (strchr (mode, '+'))
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{
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if (fd_cache_invalidate (fname))
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return GNUPG_INVALID_FD;
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oflag = O_RDWR;
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}
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else if (strchr (mode, 'w'))
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{
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if (fd_cache_invalidate (fname))
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return GNUPG_INVALID_FD;
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oflag = O_WRONLY | O_CREAT | O_TRUNC;
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}
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else
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{
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oflag = O_RDONLY;
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}
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#ifdef O_BINARY
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if (strchr (mode, 'b'))
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oflag |= O_BINARY;
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#endif
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/* No we need to distinguish between POSIX and RISC OS. */
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#ifndef __riscos__
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return open (fname, oflag, cflag);
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#else
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{
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struct stat buf;
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int rc = stat (fname, &buf);
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/* Don't allow iobufs on directories */
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if (!rc && S_ISDIR (buf.st_mode) && !S_ISREG (buf.st_mode))
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return __set_errno (EISDIR);
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else
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return open (fname, oflag, cflag);
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}
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#endif
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#endif /*!HAVE_W32_SYSTEM*/
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}
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/*
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* Instead of closing an FD we keep it open and cache it for later reuse
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* Note that this caching strategy only works if the process does not chdir.
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*/
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static void
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fd_cache_close (const char *fname, gnupg_fd_t fp)
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{
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close_cache_t cc;
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assert (fp);
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if (!fname || !*fname)
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{
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#ifdef HAVE_W32_SYSTEM
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CloseHandle (fp);
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#else
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close (fp);
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#endif
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if (DBG_IOBUF)
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log_debug ("fd_cache_close (%d) real\n", (int)fp);
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return;
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}
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/* try to reuse a slot */
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for (cc = close_cache; cc; cc = cc->next)
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{
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if (cc->fp == GNUPG_INVALID_FD && !fd_cache_strcmp (cc->fname, fname))
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{
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cc->fp = fp;
|
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if (DBG_IOBUF)
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log_debug ("fd_cache_close (%s) used existing slot\n", fname);
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return;
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}
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}
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/* add a new one */
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if (DBG_IOBUF)
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log_debug ("fd_cache_close (%s) new slot created\n", fname);
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cc = xcalloc (1, sizeof *cc + strlen (fname));
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strcpy (cc->fname, fname);
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cc->fp = fp;
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cc->next = close_cache;
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close_cache = cc;
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}
|
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/*
|
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* Do an direct_open on FNAME but first try to reuse one from the fd_cache
|
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*/
|
||
static gnupg_fd_t
|
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fd_cache_open (const char *fname, const char *mode)
|
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{
|
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close_cache_t cc;
|
||
|
||
assert (fname);
|
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for (cc = close_cache; cc; cc = cc->next)
|
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{
|
||
if (cc->fp != GNUPG_INVALID_FD && !fd_cache_strcmp (cc->fname, fname))
|
||
{
|
||
gnupg_fd_t fp = cc->fp;
|
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cc->fp = GNUPG_INVALID_FD;
|
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if (DBG_IOBUF)
|
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log_debug ("fd_cache_open (%s) using cached fp\n", fname);
|
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#ifdef HAVE_W32_SYSTEM
|
||
if (SetFilePointer (fp, 0, NULL, FILE_BEGIN) == 0xffffffff)
|
||
{
|
||
log_error ("rewind file failed on handle %p: ec=%d\n",
|
||
fp, (int) GetLastError ());
|
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fp = GNUPG_INVALID_FD;
|
||
}
|
||
#else
|
||
if (lseek (fp, 0, SEEK_SET) == (off_t) - 1)
|
||
{
|
||
log_error ("can't rewind fd %d: %s\n", fp, strerror (errno));
|
||
fp = GNUPG_INVALID_FD;
|
||
}
|
||
#endif
|
||
return fp;
|
||
}
|
||
}
|
||
if (DBG_IOBUF)
|
||
log_debug ("fd_cache_open (%s) not cached\n", fname);
|
||
return direct_open (fname, mode);
|
||
}
|
||
|
||
|
||
/****************
|
||
* 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
|
||
* GPG_ERR_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_t chain, byte * buf,
|
||
size_t * ret_len)
|
||
{
|
||
file_filter_ctx_t *a = opaque;
|
||
gnupg_fd_t f = a->fp;
|
||
size_t size = *ret_len;
|
||
size_t nbytes = 0;
|
||
int rc = 0;
|
||
|
||
(void)chain; /* Not used. */
|
||
|
||
if (control == IOBUFCTRL_UNDERFLOW)
|
||
{
|
||
assert (size); /* We need a buffer. */
|
||
if (a->eof_seen)
|
||
{
|
||
rc = -1;
|
||
*ret_len = 0;
|
||
}
|
||
else
|
||
{
|
||
#ifdef HAVE_W32_SYSTEM
|
||
unsigned long nread;
|
||
|
||
nbytes = 0;
|
||
if (!ReadFile (f, buf, size, &nread, NULL))
|
||
{
|
||
int ec = (int) GetLastError ();
|
||
if (ec != ERROR_BROKEN_PIPE)
|
||
{
|
||
rc = gpg_error_from_errno (ec);
|
||
log_error ("%s: read error: ec=%d\n", a->fname, ec);
|
||
}
|
||
}
|
||
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)
|
||
{
|
||
rc = gpg_error_from_syserror ();
|
||
log_error ("%s: read error: %s\n",
|
||
a->fname, strerror (errno));
|
||
}
|
||
}
|
||
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_W32_SYSTEM
|
||
byte *p = buf;
|
||
unsigned long n;
|
||
|
||
nbytes = size;
|
||
do
|
||
{
|
||
if (size && !WriteFile (f, p, nbytes, &n, NULL))
|
||
{
|
||
int ec = (int) GetLastError ();
|
||
rc = gpg_error_from_errno (ec);
|
||
log_error ("%s: write error: ec=%d\n", a->fname, ec);
|
||
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)
|
||
{
|
||
rc = gpg_error_from_syserror ();
|
||
log_error ("%s: write error: %s\n", a->fname, strerror (errno));
|
||
}
|
||
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)
|
||
{
|
||
*(char **) buf = "file_filter(fd)";
|
||
}
|
||
else if (control == IOBUFCTRL_FREE)
|
||
{
|
||
if (f != FD_FOR_STDIN && f != FD_FOR_STDOUT)
|
||
{
|
||
if (DBG_IOBUF)
|
||
log_debug ("%s: close fd/handle %d\n", a->fname, FD2INT (f));
|
||
if (!a->keep_open)
|
||
fd_cache_close (a->no_cache ? NULL : a->fname, f);
|
||
}
|
||
f = GNUPG_INVALID_FD;
|
||
xfree (a); /* We can free our context now. */
|
||
}
|
||
|
||
return rc;
|
||
}
|
||
|
||
|
||
#ifdef HAVE_W32_SYSTEM
|
||
/* Because network sockets are special objects under Lose32 we have to
|
||
use a dedicated filter for them. */
|
||
static int
|
||
sock_filter (void *opaque, int control, iobuf_t 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;
|
||
|
||
(void)chain;
|
||
|
||
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 ();
|
||
rc = gpg_error_from_errno (ec);
|
||
log_error ("socket read error: ec=%d\n", ec);
|
||
}
|
||
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 ();
|
||
rc = gpg_error_from_errno (ec);
|
||
log_error ("socket write error: ec=%d\n", ec);
|
||
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)
|
||
{
|
||
*(char **) buf = "sock_filter";
|
||
}
|
||
else if (control == IOBUFCTRL_FREE)
|
||
{
|
||
if (!a->keep_open)
|
||
closesocket (a->sock);
|
||
xfree (a); /* we can free our context now */
|
||
}
|
||
return rc;
|
||
}
|
||
#endif /*HAVE_W32_SYSTEM*/
|
||
|
||
/****************
|
||
* 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_t chain, byte * buffer,
|
||
size_t * ret_len)
|
||
{
|
||
block_filter_ctx_t *a = opaque;
|
||
char *buf = (char *)buffer;
|
||
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 = GPG_ERR_BAD_DATA;
|
||
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 = GPG_ERR_BAD_DATA;
|
||
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 = 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 = GPG_ERR_BAD_DATA;
|
||
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 = GPG_ERR_BAD_DATA;
|
||
}
|
||
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 = gpg_error_from_syserror ();
|
||
a->buflen = 0;
|
||
nbytes -= n;
|
||
}
|
||
if ((n = nbytes) > blen)
|
||
n = blen;
|
||
if (n && iobuf_write (chain, p, n))
|
||
rc = gpg_error_from_syserror ();
|
||
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)
|
||
{
|
||
*(char **) buf = "block_filter";
|
||
}
|
||
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 = gpg_error_from_syserror ();
|
||
}
|
||
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;
|
||
}
|
||
|
||
|
||
static void
|
||
print_chain (iobuf_t a)
|
||
{
|
||
if (!DBG_IOBUF)
|
||
return;
|
||
for (; a; a = a->chain)
|
||
{
|
||
size_t dummy_len = 0;
|
||
const char *desc = "[none]";
|
||
|
||
if (a->filter)
|
||
a->filter (a->filter_ov, IOBUFCTRL_DESC, NULL,
|
||
(byte *) & desc, &dummy_len);
|
||
|
||
log_debug ("iobuf chain: %d.%d `%s' filter_eof=%d start=%d len=%d\n",
|
||
a->no, a->subno, desc?desc:"?", a->filter_eof,
|
||
(int) a->d.start, (int) a->d.len);
|
||
}
|
||
}
|
||
|
||
int
|
||
iobuf_print_chain (iobuf_t 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_t
|
||
iobuf_alloc (int use, size_t bufsize)
|
||
{
|
||
iobuf_t a;
|
||
static int number = 0;
|
||
|
||
a = xcalloc (1, 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_t a)
|
||
{
|
||
iobuf_t 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)
|
||
{
|
||
a2 = a->chain;
|
||
if (a->use == 2 && (rc = iobuf_flush (a)))
|
||
log_error ("iobuf_flush failed on close: %s\n", gpg_strerror (rc));
|
||
|
||
if (DBG_IOBUF)
|
||
log_debug ("iobuf-%d.%d: close `%s'\n", a->no, a->subno,
|
||
a->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", gpg_strerror (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_t a)
|
||
{
|
||
const char *s;
|
||
iobuf_t a2;
|
||
int rc;
|
||
#if defined(HAVE_W32_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_W32_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_W32_SYSTEM) || defined(__riscos__)
|
||
if (remove_name)
|
||
{
|
||
/* Argg, MSDOS does not allow to remove open files. So
|
||
* we have to do it here */
|
||
#ifdef HAVE_W32CE_SYSTEM
|
||
wchar_t *wtmp = utf8_to_wchar (remove_name);
|
||
if (wtmp)
|
||
DeleteFile (wtmp);
|
||
xfree (wtmp);
|
||
#else
|
||
remove (remove_name);
|
||
#endif
|
||
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_t
|
||
iobuf_temp ()
|
||
{
|
||
iobuf_t a;
|
||
|
||
a = iobuf_alloc (3, IOBUF_BUFFER_SIZE);
|
||
|
||
return a;
|
||
}
|
||
|
||
iobuf_t
|
||
iobuf_temp_with_content (const char *buffer, size_t length)
|
||
{
|
||
iobuf_t 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 form "-&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;
|
||
}
|
||
|
||
|
||
/* Either open the file specified by the file descriptor FD or - if FD
|
||
is -1, the file with name FNAME. As of now MODE is assumed to be
|
||
"rb" if FNAME is used. In contrast to iobuf_fdopen the file
|
||
descriptor FD will not be closed during an iobuf_close. */
|
||
iobuf_t
|
||
iobuf_open_fd_or_name (gnupg_fd_t fd, const char *fname, const char *mode)
|
||
{
|
||
iobuf_t a;
|
||
|
||
if (fd == GNUPG_INVALID_FD)
|
||
a = iobuf_open (fname);
|
||
else
|
||
a = iobuf_fdopen_nc (FD2INT(fd), mode);
|
||
return a;
|
||
}
|
||
|
||
|
||
/****************
|
||
* Create a head iobuf for reading from a file
|
||
* returns: NULL if an error occures and sets errno
|
||
*/
|
||
iobuf_t
|
||
iobuf_open (const char *fname)
|
||
{
|
||
iobuf_t a;
|
||
gnupg_fd_t fp;
|
||
file_filter_ctx_t *fcx;
|
||
size_t len;
|
||
int print_only = 0;
|
||
int fd;
|
||
|
||
if (!fname || (*fname == '-' && !fname[1]))
|
||
{
|
||
fp = FD_FOR_STDIN;
|
||
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 = fd_cache_open (fname, "rb")) == GNUPG_INVALID_FD)
|
||
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_DESC, NULL, (byte *) & a->desc, &len);
|
||
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, FD2INT (fcx->fp));
|
||
|
||
return a;
|
||
}
|
||
|
||
|
||
static iobuf_t
|
||
do_iobuf_fdopen (int fd, const char *mode, int keep_open)
|
||
{
|
||
iobuf_t a;
|
||
gnupg_fd_t fp;
|
||
file_filter_ctx_t *fcx;
|
||
size_t len;
|
||
|
||
fp = INT2FD (fd);
|
||
|
||
a = iobuf_alloc (strchr (mode, 'w') ? 2 : 1, IOBUF_BUFFER_SIZE);
|
||
fcx = xmalloc (sizeof *fcx + 20);
|
||
fcx->fp = fp;
|
||
fcx->print_only_name = 1;
|
||
fcx->keep_open = keep_open;
|
||
sprintf (fcx->fname, "[fd %d]", fd);
|
||
a->filter = file_filter;
|
||
a->filter_ov = fcx;
|
||
file_filter (fcx, IOBUFCTRL_DESC, NULL, (byte *) & a->desc, &len);
|
||
file_filter (fcx, IOBUFCTRL_INIT, NULL, NULL, &len);
|
||
if (DBG_IOBUF)
|
||
log_debug ("iobuf-%d.%d: fdopen%s `%s'\n",
|
||
a->no, a->subno, keep_open? "_nc":"", fcx->fname);
|
||
iobuf_ioctl (a, IOBUF_IOCTL_NO_CACHE, 1, NULL);
|
||
return a;
|
||
}
|
||
|
||
|
||
/* Create a head iobuf for reading or writing from/to a file Returns:
|
||
* NULL and sets ERRNO if an error occured. */
|
||
iobuf_t
|
||
iobuf_fdopen (int fd, const char *mode)
|
||
{
|
||
return do_iobuf_fdopen (fd, mode, 0);
|
||
}
|
||
|
||
iobuf_t
|
||
iobuf_fdopen_nc (int fd, const char *mode)
|
||
{
|
||
return do_iobuf_fdopen (fd, mode, 1);
|
||
}
|
||
|
||
|
||
iobuf_t
|
||
iobuf_sockopen (int fd, const char *mode)
|
||
{
|
||
iobuf_t a;
|
||
#ifdef HAVE_W32_SYSTEM
|
||
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_DESC, NULL, (byte *) & a->desc, &len);
|
||
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, IOBUF_IOCTL_NO_CACHE, 1, NULL);
|
||
#else
|
||
a = iobuf_fdopen (fd, mode);
|
||
#endif
|
||
return a;
|
||
}
|
||
|
||
/****************
|
||
* create an iobuf for writing to a file; the file will be created.
|
||
*/
|
||
iobuf_t
|
||
iobuf_create (const char *fname)
|
||
{
|
||
iobuf_t a;
|
||
gnupg_fd_t fp;
|
||
file_filter_ctx_t *fcx;
|
||
size_t len;
|
||
int print_only = 0;
|
||
int fd;
|
||
|
||
if (!fname || (*fname == '-' && !fname[1]))
|
||
{
|
||
fp = FD_FOR_STDOUT;
|
||
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 = direct_open (fname, "wb")) == GNUPG_INVALID_FD)
|
||
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_DESC, NULL, (byte *) & a->desc, &len);
|
||
file_filter (fcx, IOBUFCTRL_INIT, NULL, NULL, &len);
|
||
if (DBG_IOBUF)
|
||
log_debug ("iobuf-%d.%d: create `%s'\n", a->no, a->subno,
|
||
a->desc?a->desc:"?");
|
||
|
||
return a;
|
||
}
|
||
|
||
|
||
iobuf_t
|
||
iobuf_openrw (const char *fname)
|
||
{
|
||
iobuf_t a;
|
||
gnupg_fd_t fp;
|
||
file_filter_ctx_t *fcx;
|
||
size_t len;
|
||
|
||
if (!fname)
|
||
return NULL;
|
||
else if ((fp = direct_open (fname, "r+b")) == GNUPG_INVALID_FD)
|
||
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_DESC, NULL, (byte *) & a->desc, &len);
|
||
file_filter (fcx, IOBUFCTRL_INIT, NULL, NULL, &len);
|
||
if (DBG_IOBUF)
|
||
log_debug ("iobuf-%d.%d: openrw `%s'\n", a->no, a->subno,
|
||
a->desc?a->desc:"?");
|
||
|
||
return a;
|
||
}
|
||
|
||
|
||
int
|
||
iobuf_ioctl (iobuf_t a, iobuf_ioctl_t cmd, int intval, void *ptrval)
|
||
{
|
||
if (cmd == IOBUF_IOCTL_KEEP_OPEN)
|
||
{
|
||
/* Keep system filepointer/descriptor open. This was used in
|
||
the past by http.c; this ioctl is not directly used
|
||
anymore. */
|
||
if (DBG_IOBUF)
|
||
log_debug ("iobuf-%d.%d: ioctl `%s' keep_open=%d\n",
|
||
a ? a->no : -1, a ? a->subno : -1,
|
||
a && a->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 HAVE_W32_SYSTEM
|
||
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 == IOBUF_IOCTL_INVALIDATE_CACHE)
|
||
{
|
||
if (DBG_IOBUF)
|
||
log_debug ("iobuf-*.*: ioctl `%s' invalidate\n",
|
||
ptrval ? (char *) ptrval : "?");
|
||
if (!a && !intval && ptrval)
|
||
{
|
||
if (fd_cache_invalidate (ptrval))
|
||
return -1;
|
||
return 0;
|
||
}
|
||
}
|
||
else if (cmd == IOBUF_IOCTL_NO_CACHE)
|
||
{
|
||
if (DBG_IOBUF)
|
||
log_debug ("iobuf-%d.%d: ioctl `%s' no_cache=%d\n",
|
||
a ? a->no : -1, a ? a->subno : -1,
|
||
a && a->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 HAVE_W32_SYSTEM
|
||
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 == IOBUF_IOCTL_FSYNC)
|
||
{
|
||
/* Do a fsync on the open fd and return any errors to the caller
|
||
of iobuf_ioctl. Note that we work on a file name here. */
|
||
if (DBG_IOBUF)
|
||
log_debug ("iobuf-*.*: ioctl `%s' fsync\n",
|
||
ptrval? (const char*)ptrval:"<null>");
|
||
|
||
if (!a && !intval && ptrval)
|
||
{
|
||
return fd_cache_synchronize (ptrval);
|
||
}
|
||
}
|
||
|
||
|
||
return -1;
|
||
}
|
||
|
||
|
||
/****************
|
||
* Register an i/o filter.
|
||
*/
|
||
int
|
||
iobuf_push_filter (iobuf_t a,
|
||
int (*f) (void *opaque, int control,
|
||
iobuf_t chain, byte * buf, size_t * len),
|
||
void *ov)
|
||
{
|
||
return iobuf_push_filter2 (a, f, ov, 0);
|
||
}
|
||
|
||
int
|
||
iobuf_push_filter2 (iobuf_t a,
|
||
int (*f) (void *opaque, int control,
|
||
iobuf_t chain, byte * buf, size_t * len),
|
||
void *ov, int rel_ov)
|
||
{
|
||
iobuf_t b;
|
||
size_t dummy_len = 0;
|
||
int rc = 0;
|
||
|
||
if (a->directfp)
|
||
BUG ();
|
||
|
||
if (a->use == 2 && (rc = iobuf_flush (a)))
|
||
return rc;
|
||
/* 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;
|
||
f (ov, IOBUFCTRL_DESC, NULL, (byte *) & a->desc, &dummy_len);
|
||
|
||
if (DBG_IOBUF)
|
||
{
|
||
log_debug ("iobuf-%d.%d: push `%s'\n", a->no, a->subno,
|
||
a->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", gpg_strerror (rc));
|
||
return rc;
|
||
}
|
||
|
||
/****************
|
||
* Remove an i/o filter.
|
||
*/
|
||
static int
|
||
pop_filter (iobuf_t a, int (*f) (void *opaque, int control,
|
||
iobuf_t chain, byte * buf, size_t * len),
|
||
void *ov)
|
||
{
|
||
iobuf_t b;
|
||
size_t dummy_len = 0;
|
||
int rc = 0;
|
||
|
||
if (a->directfp)
|
||
BUG ();
|
||
|
||
if (DBG_IOBUF)
|
||
log_debug ("iobuf-%d.%d: pop `%s'\n", a->no, a->subno,
|
||
a->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", gpg_strerror (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", gpg_strerror (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_t 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)
|
||
{
|
||
iobuf_t b = a->chain;
|
||
if (DBG_IOBUF)
|
||
log_debug ("iobuf-%d.%d: pop `%s' in underflow\n",
|
||
a->no, a->subno, a->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 = gpg_error_from_syserror ();
|
||
}
|
||
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", gpg_strerror (rc));
|
||
if (a->filter_ov && a->filter_ov_owner)
|
||
{
|
||
xfree (a->filter_ov);
|
||
a->filter_ov = NULL;
|
||
}
|
||
a->filter = NULL;
|
||
a->desc = NULL;
|
||
a->filter_ov = NULL;
|
||
a->filter_eof = 1;
|
||
if (!len && a->chain)
|
||
{
|
||
iobuf_t 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 = rc;
|
||
|
||
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_t a)
|
||
{
|
||
size_t len;
|
||
int rc;
|
||
|
||
if (a->directfp)
|
||
return 0;
|
||
|
||
if (a->use == 3)
|
||
{ /* increase the temp buffer */
|
||
unsigned 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 = GPG_ERR_INTERNAL;
|
||
}
|
||
else if (rc)
|
||
a->error = rc;
|
||
a->d.len = 0;
|
||
|
||
return rc;
|
||
}
|
||
|
||
|
||
/****************
|
||
* Read a byte from the iobuf; returns -1 on EOF
|
||
*/
|
||
int
|
||
iobuf_readbyte (iobuf_t a)
|
||
{
|
||
int c;
|
||
|
||
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_t a, void *buffer, unsigned int buflen)
|
||
{
|
||
unsigned char *buf = (unsigned char *)buffer;
|
||
int c, n;
|
||
|
||
if (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_t 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_t a, unsigned int c)
|
||
{
|
||
int rc;
|
||
|
||
if (a->directfp)
|
||
BUG ();
|
||
|
||
if (a->d.len == a->d.size)
|
||
if ((rc=iobuf_flush (a)))
|
||
return rc;
|
||
|
||
assert (a->d.len < a->d.size);
|
||
a->d.buf[a->d.len++] = c;
|
||
return 0;
|
||
}
|
||
|
||
|
||
int
|
||
iobuf_write (iobuf_t a, const void *buffer, unsigned int buflen)
|
||
{
|
||
const unsigned char *buf = (const unsigned char *)buffer;
|
||
int rc;
|
||
|
||
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)
|
||
{
|
||
rc = iobuf_flush (a);
|
||
if (rc)
|
||
return rc;
|
||
}
|
||
}
|
||
while (buflen);
|
||
return 0;
|
||
}
|
||
|
||
|
||
int
|
||
iobuf_writestr (iobuf_t a, const char *buf)
|
||
{
|
||
int rc;
|
||
|
||
for (; *buf; buf++)
|
||
if ((rc=iobuf_writebyte (a, *buf)))
|
||
return rc;
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
/****************
|
||
* copy the contents of TEMP to A.
|
||
*/
|
||
int
|
||
iobuf_write_temp (iobuf_t a, iobuf_t 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_t 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_t 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_t 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_t a, int *overflow)
|
||
{
|
||
struct stat st;
|
||
|
||
if (overflow)
|
||
*overflow = 0;
|
||
|
||
if ( a->directfp )
|
||
{
|
||
FILE *fp = a->directfp;
|
||
|
||
if ( !fstat(fileno(fp), &st) )
|
||
return st.st_size;
|
||
log_error("fstat() failed: %s\n", strerror(errno) );
|
||
return 0;
|
||
}
|
||
|
||
/* 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;
|
||
gnupg_fd_t fp = b->fp;
|
||
|
||
#if defined(HAVE_W32_SYSTEM)
|
||
ulong size;
|
||
static int (* __stdcall get_file_size_ex) (void *handle,
|
||
LARGE_INTEGER *r_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 because it seem that GetFileSize won't return a
|
||
proper error in case a file is larger than 4GB. */
|
||
LARGE_INTEGER exsize;
|
||
|
||
if (get_file_size_ex (fp, &exsize))
|
||
{
|
||
if (!exsize.u.HighPart)
|
||
return exsize.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));
|
||
#else
|
||
if ( !fstat (FD2INT (fp), &st) )
|
||
return st.st_size;
|
||
log_error("fstat() failed: %s\n", strerror(errno) );
|
||
#endif
|
||
break/*the for loop*/;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Return the file descriptor of the underlying file or -1 if it is
|
||
not available. */
|
||
int
|
||
iobuf_get_fd (iobuf_t 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;
|
||
gnupg_fd_t fp = b->fp;
|
||
|
||
return FD2INT (fp);
|
||
}
|
||
|
||
return -1;
|
||
}
|
||
|
||
|
||
|
||
/****************
|
||
* Tell the file position, where the next read will take place
|
||
*/
|
||
off_t
|
||
iobuf_tell (iobuf_t 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_t 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 HAVE_W32_SYSTEM
|
||
if (SetFilePointer (b->fp, newpos, NULL, FILE_BEGIN) == 0xffffffff)
|
||
{
|
||
log_error ("SetFilePointer failed on handle %p: ec=%d\n",
|
||
b->fp, (int) GetLastError ());
|
||
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
|
||
}
|
||
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. This is the filename actually used on
|
||
* disk and not a made up one. Returns NULL if no real filename is
|
||
* available.
|
||
*/
|
||
const char *
|
||
iobuf_get_real_fname (iobuf_t 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. This name should only be used in diagnostics.
|
||
*/
|
||
const char *
|
||
iobuf_get_fname (iobuf_t 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;
|
||
}
|
||
|
||
/* Same as iobuf_get_fname but never returns NULL. */
|
||
const char *
|
||
iobuf_get_fname_nonnull (iobuf_t a)
|
||
{
|
||
const char *fname;
|
||
|
||
fname = iobuf_get_fname (a);
|
||
return fname? fname : "[?]";
|
||
}
|
||
|
||
|
||
/****************
|
||
* 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_t a, size_t len)
|
||
{
|
||
block_filter_ctx_t *ctx = xcalloc (1, 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 int
|
||
iobuf_read_line (iobuf_t a, byte ** addr_of_buffer,
|
||
unsigned *length_of_buffer, unsigned *max_length)
|
||
{
|
||
int c;
|
||
char *buffer = (char *)*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 = (unsigned char *)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 = (unsigned char *)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;
|
||
}
|
||
|
||
static int
|
||
translate_file_handle (int fd, int for_write)
|
||
{
|
||
#if defined(HAVE_W32CE_SYSTEM)
|
||
/* This is called only with one of the special filenames. Under
|
||
W32CE the FD here is not a file descriptor but a rendezvous id,
|
||
thus we need to finish the pipe first. */
|
||
fd = _assuan_w32ce_finish_pipe (fd, for_write);
|
||
#elif defined(HAVE_W32_SYSTEM)
|
||
{
|
||
int x;
|
||
|
||
(void)for_write;
|
||
|
||
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: ec=%d\n",
|
||
fd, (int) GetLastError ());
|
||
|
||
fd = x;
|
||
}
|
||
#else
|
||
(void)for_write;
|
||
#endif
|
||
return fd;
|
||
}
|
||
|
||
|
||
void
|
||
iobuf_skip_rest (iobuf_t 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;
|
||
}
|
||
}
|
||
}
|
||
}
|