mirror of
git://git.gnupg.org/gnupg.git
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334 lines
8.5 KiB
C
334 lines
8.5 KiB
C
/* miscellaneous.c - Stuff not fitting elsewhere
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* Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* 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
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* 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 <stdlib.h>
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#include <errno.h>
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#define JNLIB_NEED_LOG_LOGV
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#include "util.h"
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#include "iobuf.h"
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#include "i18n.h"
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/* Used by libgcrypt for logging. */
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static void
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my_gcry_logger (void *dummy, int level, const char *fmt, va_list arg_ptr)
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{
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(void)dummy;
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/* Map the log levels. */
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switch (level)
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{
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case GCRY_LOG_CONT: level = JNLIB_LOG_CONT; break;
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case GCRY_LOG_INFO: level = JNLIB_LOG_INFO; break;
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case GCRY_LOG_WARN: level = JNLIB_LOG_WARN; break;
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case GCRY_LOG_ERROR:level = JNLIB_LOG_ERROR; break;
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case GCRY_LOG_FATAL:level = JNLIB_LOG_FATAL; break;
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case GCRY_LOG_BUG: level = JNLIB_LOG_BUG; break;
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case GCRY_LOG_DEBUG:level = JNLIB_LOG_DEBUG; break;
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default: level = JNLIB_LOG_ERROR; break;
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}
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log_logv (level, fmt, arg_ptr);
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}
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/* This function is called by libgcrypt on a fatal error. */
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static void
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my_gcry_fatalerror_handler (void *opaque, int rc, const char *text)
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{
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(void)opaque;
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log_fatal ("libgcrypt problem: %s\n", text ? text : gpg_strerror (rc));
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abort ();
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}
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/* This function is called by libgcrypt if it ran out of core and
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there is no way to return that error to the caller. We do our own
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function here to make use of our logging functions. */
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static int
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my_gcry_outofcore_handler (void *opaque, size_t req_n, unsigned int flags)
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{
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static int been_here; /* Used to protect against recursive calls. */
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(void)opaque;
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if (!been_here)
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{
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been_here = 1;
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if ( (flags & 1) )
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log_fatal (_("out of core in secure memory "
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"while allocating %lu bytes"), (unsigned long)req_n);
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else
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log_fatal (_("out of core while allocating %lu bytes"),
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(unsigned long)req_n);
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}
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return 0; /* Let libgcrypt call its own fatal error handler.
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Actually this will turn out to be
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my_gcry_fatalerror_handler. */
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}
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/* Setup libgcrypt to use our own logging functions. Should be used
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early at startup. */
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void
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setup_libgcrypt_logging (void)
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{
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gcry_set_log_handler (my_gcry_logger, NULL);
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gcry_set_fatalerror_handler (my_gcry_fatalerror_handler, NULL);
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gcry_set_outofcore_handler (my_gcry_outofcore_handler, NULL);
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}
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/* A wrapper around gcry_cipher_algo_name to return the string
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"AES-128" instead of "AES". Given that we have an alias in
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libgcrypt for it, it does not harm to too much to return this other
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string. Some users complained that we print "AES" but "AES192"
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and "AES256". We can't fix that in libgcrypt but it is pretty
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safe to do it in an application. */
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const char *
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gnupg_cipher_algo_name (int algo)
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{
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const char *s;
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s = gcry_cipher_algo_name (algo);
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if (!strcmp (s, "AES"))
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s = "AES128";
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return s;
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}
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/* Decide whether the filename is stdout or a real filename and return
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* an appropriate string. */
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const char *
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print_fname_stdout (const char *s)
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{
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if( !s || (*s == '-' && !s[1]) )
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return "[stdout]";
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return s;
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}
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/* Decide whether the filename is stdin or a real filename and return
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* an appropriate string. */
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const char *
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print_fname_stdin (const char *s)
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{
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if( !s || (*s == '-' && !s[1]) )
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return "[stdin]";
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return s;
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}
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void
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print_utf8_buffer2 (estream_t stream, const void *p, size_t n, int delim)
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{
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char tmp[2];
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tmp[0] = delim;
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tmp[1] = 0;
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es_write_sanitized_utf8_buffer (stream, p, n, tmp, NULL);
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}
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void
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print_utf8_buffer (estream_t stream, const void *p, size_t n)
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{
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es_write_sanitized_utf8_buffer (stream, p, n, NULL, NULL);
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}
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/* Write LENGTH bytes of BUFFER to FP as a hex encoded string.
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RESERVED must be 0. */
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void
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print_hexstring (FILE *fp, const void *buffer, size_t length, int reserved)
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{
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#define tohex(n) ((n) < 10 ? ((n) + '0') : (((n) - 10) + 'A'))
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const unsigned char *s;
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(void)reserved;
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for (s = buffer; length; s++, length--)
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{
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putc ( tohex ((*s>>4)&15), fp);
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putc ( tohex (*s&15), fp);
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}
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#undef tohex
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}
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char *
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make_printable_string (const void *p, size_t n, int delim )
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{
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return sanitize_buffer (p, n, delim);
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}
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/*
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* Check if the file is compressed.
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*/
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int
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is_file_compressed (const char *s, int *ret_rc)
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{
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iobuf_t a;
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byte buf[4];
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int i, rc = 0;
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int overflow;
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struct magic_compress_s {
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size_t len;
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byte magic[4];
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} magic[] = {
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{ 3, { 0x42, 0x5a, 0x68, 0x00 } }, /* bzip2 */
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{ 3, { 0x1f, 0x8b, 0x08, 0x00 } }, /* gzip */
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{ 4, { 0x50, 0x4b, 0x03, 0x04 } }, /* (pk)zip */
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};
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if ( iobuf_is_pipe_filename (s) || !ret_rc )
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return 0; /* We can't check stdin or no file was given */
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a = iobuf_open( s );
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if ( a == NULL ) {
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*ret_rc = gpg_error_from_syserror ();
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return 0;
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}
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if ( iobuf_get_filelength( a, &overflow ) < 4 && !overflow) {
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*ret_rc = 0;
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goto leave;
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}
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if ( iobuf_read( a, buf, 4 ) == -1 ) {
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*ret_rc = a->error;
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goto leave;
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}
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for ( i = 0; i < DIM( magic ); i++ ) {
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if ( !memcmp( buf, magic[i].magic, magic[i].len ) ) {
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*ret_rc = 0;
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rc = 1;
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break;
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}
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}
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leave:
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iobuf_close( a );
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return rc;
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}
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/* Try match against each substring of multistr, delimited by | */
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int
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match_multistr (const char *multistr,const char *match)
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{
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do
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{
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size_t seglen = strcspn (multistr,"|");
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if (!seglen)
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break;
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/* Using the localized strncasecmp! */
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if (strncasecmp(multistr,match,seglen)==0)
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return 1;
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multistr += seglen;
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if (*multistr == '|')
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multistr++;
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}
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while (*multistr);
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return 0;
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}
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/* Parse the first portion of the version number S and store it at
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NUMBER. On success, the function returns a pointer into S starting
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with the first character, which is not part of the initial number
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portion; on failure, NULL is returned. */
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static const char*
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parse_version_number (const char *s, int *number)
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{
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int val = 0;
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if (*s == '0' && digitp (s+1))
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return NULL; /* Leading zeros are not allowed. */
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for (; digitp (s); s++ )
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{
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val *= 10;
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val += *s - '0';
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}
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*number = val;
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return val < 0? NULL : s;
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}
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/* Break up the complete string representation of the version number S,
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which is expected to have this format:
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<major number>.<minor number>.<micro number><patch level>.
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The major, minor and micro number components will be stored at
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MAJOR, MINOR and MICRO. On success, a pointer to the last
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component, the patch level, will be returned; on failure, NULL will
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be returned. */
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static const char *
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parse_version_string (const char *s, int *major, int *minor, int *micro)
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{
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s = parse_version_number (s, major);
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if (!s || *s != '.')
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return NULL;
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s++;
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s = parse_version_number (s, minor);
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if (!s || *s != '.')
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return NULL;
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s++;
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s = parse_version_number (s, micro);
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if (!s)
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return NULL;
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return s; /* Patchlevel. */
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}
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/* Return true if version string is at least version B. */
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int
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gnupg_compare_version (const char *a, const char *b)
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{
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int a_major, a_minor, a_micro;
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int b_major, b_minor, b_micro;
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const char *a_plvl, *b_plvl;
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if (!a || !b)
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return 0;
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/* Parse version A. */
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a_plvl = parse_version_string (a, &a_major, &a_minor, &a_micro);
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if (!a_plvl )
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return 0; /* Invalid version number. */
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/* Parse version B. */
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b_plvl = parse_version_string (b, &b_major, &b_minor, &b_micro);
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if (!b_plvl )
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return 0; /* Invalid version number. */
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/* Compare version numbers. */
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return (a_major > b_major
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|| (a_major == b_major && a_minor > b_minor)
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|| (a_major == b_major && a_minor == b_minor
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&& a_micro > b_micro)
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|| (a_major == b_major && a_minor == b_minor
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&& a_micro == b_micro
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&& strcmp (a_plvl, b_plvl) >= 0));
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}
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