Updated card stuff to support T=0 cards.
[gnupg.git] / g10 / plaintext.c
index edd1289..e3ea369 100644 (file)
@@ -1,21 +1,23 @@
-/* plaintext.c -  process an plaintext packet
- *     Copyright (c) 1997 by Werner Koch (dd9jn)
+/* plaintext.c -  process plaintext packets
+ * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
+ *               2005 Free Software Foundation, Inc.
  *
  *
- * This file is part of G10.
+ * This file is part of GnuPG.
  *
  *
- * G10 is free software; you can redistribute it and/or modify
+ * 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 2 of the License, or
  * (at your option) any later version.
  *
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
- * G10 is distributed in the hope that it will be useful,
+ * GnuPG is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
  */
 
 #include <config.h>
  */
 
 #include <config.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#include <assert.h>
+#include <sys/types.h>
+#ifdef HAVE_DOSISH_SYSTEM
+#include <fcntl.h> /* for setmode() */
+#endif
+
 #include "util.h"
 #include "memory.h"
 #include "options.h"
 #include "packet.h"
 #include "ttyio.h"
 #include "filter.h"
 #include "util.h"
 #include "memory.h"
 #include "options.h"
 #include "packet.h"
 #include "ttyio.h"
 #include "filter.h"
+#include "main.h"
+#include "status.h"
+#include "i18n.h"
 
 
 /****************
 
 
 /****************
  *      bytes from the plaintext.
  */
 int
  *      bytes from the plaintext.
  */
 int
-handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx )
+handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx,
+                 int nooutput, int clearsig )
 {
 {
-    char *fname;
+    char *fname = NULL;
     FILE *fp = NULL;
     FILE *fp = NULL;
+    static off_t count=0;
     int rc = 0;
     int c;
     int rc = 0;
     int c;
+    int convert = (pt->mode == 't' || pt->mode == 'u');
+#ifdef __riscos__
+    int filetype = 0xfff;
+#endif
+
+    /* Let people know what the plaintext info is. This allows the
+       receiving program to try and do something different based on
+       the format code (say, recode UTF-8 to local). */
+    if(!nooutput && is_status_enabled())
+      {
+       char status[50];
+
+       sprintf(status,"%X %lu ",(byte)pt->mode,(ulong)pt->timestamp);
+       write_status_text_and_buffer(STATUS_PLAINTEXT,
+                                    status,pt->name,pt->namelen,0);
+
+       if(!pt->is_partial)
+         {
+           sprintf(status,"%lu",(ulong)pt->len);
+           write_status_text(STATUS_PLAINTEXT_LENGTH,status);
+         }
+      }
 
     /* create the filename as C string */
 
     /* create the filename as C string */
-    if( opt.outfile ) {
-       fname = m_alloc( strlen( opt.outfile ) + 1);
+    if( nooutput )
+       ;
+    else if( opt.outfile ) {
+       fname = xmalloc( strlen( opt.outfile ) + 1);
        strcpy(fname, opt.outfile );
     }
        strcpy(fname, opt.outfile );
     }
-    else {
-       fname = m_alloc( pt->namelen +1 );
-       memcpy( fname, pt->name, pt->namelen );
-       fname[pt->namelen] = 0;
+    else if( pt->namelen == 8 && !memcmp( pt->name, "_CONSOLE", 8 ) ) {
+       log_info(_("data not saved; use option \"--output\" to save it\n"));
+       nooutput = 1;
     }
     }
-
-    if( !*fname ) { /* no filename given */
-       if( opt.outfile_is_stdout )
-           fp = stdout;
-       else {
-           log_error("no outputfile given\n");
+    else if( !opt.use_embedded_filename ) {
+       fname = make_outfile_name( iobuf_get_real_fname(pt->buf) );
+       if( !fname )
+           fname = ask_outfile_name( pt->name, pt->namelen );
+       if( !fname ) {
+           rc = G10ERR_CREATE_FILE;
            goto leave;
        }
     }
            goto leave;
        }
     }
-    else if( overwrite_filep( fname ) )
-       goto leave;
+    else {
+       fname = make_printable_string( pt->name, pt->namelen, 0 );
+    }
 
 
-    if( fp )
+    if( nooutput )
        ;
        ;
+    else if ( iobuf_is_pipe_filename (fname) || !*fname)
+      {
+       /* No filename or "-" given; write to stdout. */
+       fp = stdout;
+#ifdef HAVE_DOSISH_SYSTEM
+       setmode ( fileno(fp) , O_BINARY );
+#endif
+      }
+    else {
+       while( !overwrite_filep (fname) ) {
+            char *tmp = ask_outfile_name (NULL, 0);
+            if ( !tmp || !*tmp ) {
+                xfree (tmp);
+                rc = G10ERR_CREATE_FILE;
+                goto leave;
+            }
+            xfree (fname);
+            fname = tmp;
+        }
+    }
+
+#ifndef __riscos__
+    if( fp || nooutput )
+       ;
+    else if (is_secured_filename (fname))
+      {
+        errno = EPERM;
+       log_error(_("error creating `%s': %s\n"), fname, strerror(errno) );
+       rc = G10ERR_CREATE_FILE;
+       goto leave;
+      }
     else if( !(fp = fopen(fname,"wb")) ) {
     else if( !(fp = fopen(fname,"wb")) ) {
-       log_error("Error creating '%s': %s\n", fname, strerror(errno) );
-       rc = G10ERR_WRITE_FILE;
+       log_error(_("error creating `%s': %s\n"), fname, strerror(errno) );
+       rc = G10ERR_CREATE_FILE;
        goto leave;
     }
        goto leave;
     }
+#else /* __riscos__ */
+    /* If no output filename was given, i.e. we constructed it,
+       convert all '.' in fname to '/' but not vice versa as
+       we don't create directories! */
+    if( !opt.outfile )
+        for( c=0; fname[c]; ++c )
+            if( fname[c] == '.' )
+                fname[c] = '/';
 
 
-    if( pt->len ) {
-       for( ; pt->len; pt->len-- ) {
-           if( (c = iobuf_get(pt->buf)) == -1 ) {
-               log_error("Problem reading source\n");
-               rc = G10ERR_READ_FILE;
-               goto leave;
+    if( fp || nooutput )
+       ;
+    else {
+        fp = fopen(fname,"wb");
+        if( !fp ) {
+            log_error(_("error creating `%s': %s\n"), fname, strerror(errno) );
+            rc = G10ERR_CREATE_FILE;
+            if (errno == 106)
+                log_info("Do output file and input file have the same name?\n");
+            goto leave;
+       }
+
+        /* If there's a ,xxx extension in the embedded filename,
+           use that, else check whether the user input (in fname)
+           has a ,xxx appended, then use that in preference */
+        if( (c = riscos_get_filetype_from_string( pt->name,
+                                                  pt->namelen )) != -1 )
+            filetype = c;
+        if( (c = riscos_get_filetype_from_string( fname,
+                                                  strlen(fname) )) != -1 )
+            filetype = c;
+        riscos_set_filetype_by_number(fname, filetype);
+    }
+#endif /* __riscos__ */
+
+    if( !pt->is_partial ) {
+        /* we have an actual length (which might be zero). */
+       assert( !clearsig );
+       if( convert ) { /* text mode */
+           for( ; pt->len; pt->len-- ) {
+               if( (c = iobuf_get(pt->buf)) == -1 ) {
+                   log_error("Problem reading source (%u bytes remaining)\n",
+                             (unsigned)pt->len);
+                   rc = G10ERR_READ_FILE;
+                   goto leave;
+               }
+               if( mfx->md )
+                   md_putc(mfx->md, c );
+#ifndef HAVE_DOSISH_SYSTEM
+               if( c == '\r' )  /* convert to native line ending */
+                   continue;    /* fixme: this hack might be too simple */
+#endif
+               if( fp )
+                 {
+                   if(opt.max_output && (++count)>opt.max_output)
+                     {
+                       log_error("Error writing to `%s': %s\n",
+                                 fname,"exceeded --max-output limit\n");
+                       rc = G10ERR_WRITE_FILE;
+                       goto leave;
+                     }
+                   else if( putc( c, fp ) == EOF )
+                     {
+                       log_error("Error writing to `%s': %s\n",
+                                 fname, strerror(errno) );
+                       rc = G10ERR_WRITE_FILE;
+                       goto leave;
+                     }
+                 }
            }
            }
-           if( mfx->md )
-               md_putchar(mfx->md, c );
-           if( mfx->rmd160 )
-               rmd160_putchar(mfx->rmd160, c );
-           if( mfx->md5 )
-               md5_putchar(mfx->md5, c );
-           if( putc( c, fp ) == EOF ) {
-               log_error("Error writing to '%s': %s\n", fname, strerror(errno) );
-               rc = G10ERR_WRITE_FILE;
-               goto leave;
+       }
+       else { /* binary mode */
+           byte *buffer = xmalloc( 32768 );
+           while( pt->len ) {
+               int len = pt->len > 32768 ? 32768 : pt->len;
+               len = iobuf_read( pt->buf, buffer, len );
+               if( len == -1 ) {
+                   log_error("Problem reading source (%u bytes remaining)\n",
+                             (unsigned)pt->len);
+                   rc = G10ERR_READ_FILE;
+                   xfree( buffer );
+                   goto leave;
+               }
+               if( mfx->md )
+                   md_write( mfx->md, buffer, len );
+               if( fp )
+                 {
+                   if(opt.max_output && (count+=len)>opt.max_output)
+                     {
+                       log_error("Error writing to `%s': %s\n",
+                                 fname,"exceeded --max-output limit\n");
+                       rc = G10ERR_WRITE_FILE;
+                       xfree( buffer );
+                       goto leave;
+                     }
+                   else if( fwrite( buffer, 1, len, fp ) != len )
+                     {
+                       log_error("Error writing to `%s': %s\n",
+                                 fname, strerror(errno) );
+                       rc = G10ERR_WRITE_FILE;
+                       xfree( buffer );
+                       goto leave;
+                     }
+                 }
+               pt->len -= len;
            }
            }
+           xfree( buffer );
        }
     }
        }
     }
-    else {
+    else if( !clearsig ) {
+       if( convert ) { /* text mode */
+           while( (c = iobuf_get(pt->buf)) != -1 ) {
+               if( mfx->md )
+                   md_putc(mfx->md, c );
+#ifndef HAVE_DOSISH_SYSTEM
+               if( convert && c == '\r' )
+                   continue; /* fixme: this hack might be too simple */
+#endif
+               if( fp )
+                 {
+                   if(opt.max_output && (++count)>opt.max_output)
+                     {
+                       log_error("Error writing to `%s': %s\n",
+                                 fname,"exceeded --max-output limit\n");
+                       rc = G10ERR_WRITE_FILE;
+                       goto leave;
+                     }
+                   else if( putc( c, fp ) == EOF )
+                     {
+                       log_error("Error writing to `%s': %s\n",
+                                 fname, strerror(errno) );
+                       rc = G10ERR_WRITE_FILE;
+                       goto leave;
+                     }
+                 }
+           }
+       }
+       else { /* binary mode */
+           byte *buffer = xmalloc( 32768 );
+           int eof;
+           for( eof=0; !eof; ) {
+               /* Why do we check for len < 32768:
+                * If we won't, we would practically read 2 EOFs but
+                * the first one has already popped the block_filter
+                * off and therefore we don't catch the boundary.
+                * So, always assume EOF if iobuf_read returns less bytes
+                * then requested */
+               int len = iobuf_read( pt->buf, buffer, 32768 );
+               if( len == -1 )
+                   break;
+               if( len < 32768 )
+                   eof = 1;
+               if( mfx->md )
+                   md_write( mfx->md, buffer, len );
+               if( fp )
+                 {
+                   if(opt.max_output && (count+=len)>opt.max_output)
+                     {
+                       log_error("Error writing to `%s': %s\n",
+                                 fname,"exceeded --max-output limit\n");
+                       rc = G10ERR_WRITE_FILE;
+                       xfree( buffer );
+                       goto leave;
+                     }
+                   else if( fwrite( buffer, 1, len, fp ) != len ) {
+                     log_error("Error writing to `%s': %s\n",
+                               fname, strerror(errno) );
+                     rc = G10ERR_WRITE_FILE;
+                     xfree( buffer );
+                     goto leave;
+                   }
+                 }
+           }
+           xfree( buffer );
+       }
+       pt->buf = NULL;
+    }
+    else {  /* clear text signature - don't hash the last cr,lf  */
+       int state = 0;
+
        while( (c = iobuf_get(pt->buf)) != -1 ) {
        while( (c = iobuf_get(pt->buf)) != -1 ) {
-           if( mfx->rmd160 )
-               rmd160_putchar(mfx->rmd160, c );
-           if( mfx->md5 )
-               md5_putchar(mfx->md5, c );
-           if( putc( c, fp ) == EOF ) {
-               log_error("Error writing to '%s': %s\n",
-                                           fname, strerror(errno) );
-               rc = G10ERR_WRITE_FILE;
-               goto leave;
+           if( fp )
+             {
+               if(opt.max_output && (++count)>opt.max_output)
+                 {
+                   log_error("Error writing to `%s': %s\n",
+                             fname,"exceeded --max-output limit\n");
+                   rc = G10ERR_WRITE_FILE;
+                   goto leave;
+                 }
+               else if( putc( c, fp ) == EOF )
+                 {
+                   log_error("Error writing to `%s': %s\n",
+                             fname, strerror(errno) );
+                   rc = G10ERR_WRITE_FILE;
+                   goto leave;
+                 }
+             }
+           if( !mfx->md )
+               continue;
+           if( state == 2 ) {
+               md_putc(mfx->md, '\r' );
+               md_putc(mfx->md, '\n' );
+               state = 0;
+           }
+           if( !state ) {
+               if( c == '\r'  )
+                   state = 1;
+               else if( c == '\n'  )
+                   state = 2;
+               else
+                   md_putc(mfx->md, c );
+           }
+           else if( state == 1 ) {
+               if( c == '\n'  )
+                   state = 2;
+               else {
+                   md_putc(mfx->md, '\r' );
+                   if( c == '\r'  )
+                       state = 1;
+                   else {
+                       state = 0;
+                       md_putc(mfx->md, c );
+                   }
+               }
            }
        }
            }
        }
-       iobuf_clear_eof(pt->buf);
+       pt->buf = NULL;
     }
 
     if( fp && fp != stdout && fclose(fp) ) {
     }
 
     if( fp && fp != stdout && fclose(fp) ) {
-       log_error("Error closing '%s': %s\n", fname, strerror(errno) );
+       log_error("Error closing `%s': %s\n", fname, strerror(errno) );
        fp = NULL;
        rc = G10ERR_WRITE_FILE;
        goto leave;
        fp = NULL;
        rc = G10ERR_WRITE_FILE;
        goto leave;
@@ -122,46 +382,158 @@ handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx )
   leave:
     if( fp && fp != stdout )
        fclose(fp);
   leave:
     if( fp && fp != stdout )
        fclose(fp);
-    m_free(fname);
+    xfree(fname);
     return rc;
 }
 
     return rc;
 }
 
+static void
+do_hash( MD_HANDLE md, MD_HANDLE md2, IOBUF fp, int textmode )
+{
+    text_filter_context_t tfx;
+    int c;
+
+    if( textmode ) {
+       memset( &tfx, 0, sizeof tfx);
+       iobuf_push_filter( fp, text_filter, &tfx );
+    }
+    if( md2 ) { /* work around a strange behaviour in pgp2 */
+       /* It seems that at least PGP5 converts a single CR to a CR,LF too */
+       int lc = -1;
+       while( (c = iobuf_get(fp)) != -1 ) {
+           if( c == '\n' && lc == '\r' )
+               md_putc(md2, c);
+           else if( c == '\n' ) {
+               md_putc(md2, '\r');
+               md_putc(md2, c);
+           }
+           else if( c != '\n' && lc == '\r' ) {
+               md_putc(md2, '\n');
+               md_putc(md2, c);
+           }
+           else
+               md_putc(md2, c);
+
+           if( md )
+               md_putc(md, c );
+           lc = c;
+       }
+    }
+    else {
+       while( (c = iobuf_get(fp)) != -1 ) {
+           if( md )
+               md_putc(md, c );
+       }
+    }
+}
+
 
 /****************
  * Ask for the detached datafile and calculate the digest from it.
 
 /****************
  * Ask for the detached datafile and calculate the digest from it.
+ * INFILE is the name of the input file.
  */
 int
  */
 int
-ask_for_detached_datafile( md_filter_context_t *mfx )
+ask_for_detached_datafile( MD_HANDLE md, MD_HANDLE md2,
+                          const char *inname, int textmode )
 {
 {
-    char *answer;
-    FILE *fp;
+    progress_filter_context_t pfx;
+    char *answer = NULL;
+    IOBUF fp;
     int rc = 0;
     int rc = 0;
-    int c;
 
 
-    tty_printf("Detached signature.\n");
-    answer = tty_get("Please enter name of data file: ");
-    tty_kill_prompt();
+    fp = open_sigfile( inname, &pfx ); /* open default file */
 
 
-    fp = fopen(answer,"rb");
-    if( !fp ) {
-       log_error("can't open '%s': %s\n", answer, strerror(errno) );
-       rc = G10ERR_READ_FILE;
-       goto leave;
+    if( !fp && !opt.batch ) {
+       int any=0;
+       tty_printf(_("Detached signature.\n"));
+       do {
+           xfree(answer);
+           tty_enable_completion(NULL);
+           answer = cpr_get("detached_signature.filename",
+                          _("Please enter name of data file: "));
+           tty_disable_completion();
+           cpr_kill_prompt();
+           if( any && !*answer ) {
+               rc = G10ERR_READ_FILE;
+               goto leave;
+           }
+           fp = iobuf_open(answer);
+            if (fp && is_secured_file (iobuf_get_fd (fp)))
+              {
+                iobuf_close (fp);
+                fp = NULL;
+                errno = EPERM;
+              }
+           if( !fp && errno == ENOENT ) {
+               tty_printf("No such file, try again or hit enter to quit.\n");
+               any++;
+           }
+           else if( !fp )
+             {
+               log_error(_("can't open `%s': %s\n"), answer, strerror(errno));
+               rc = G10ERR_READ_FILE;
+               goto leave;
+             }
+       } while( !fp );
     }
 
     }
 
-    while( (c = getc(fp)) != EOF ) {
-       if( mfx->md )
-           md_putchar(mfx->md, c );
-       if( mfx->rmd160 )
-           rmd160_putchar(mfx->rmd160, c );
-       if( mfx->md5 )
-           md5_putchar(mfx->md5, c );
+    if( !fp ) {
+       if( opt.verbose )
+           log_info(_("reading stdin ...\n"));
+       fp = iobuf_open( NULL );
+       assert(fp);
     }
     }
-    fclose(fp);
+    do_hash( md, md2, fp, textmode );
+    iobuf_close(fp);
 
   leave:
 
   leave:
-    m_free(answer);
+    xfree(answer);
     return rc;
 }
 
 
     return rc;
 }
 
 
+
+/****************
+ * Hash the given files and append the hash to hash context md.
+ * If FILES is NULL, hash stdin.
+ */
+int
+hash_datafiles( MD_HANDLE md, MD_HANDLE md2, STRLIST files,
+               const char *sigfilename, int textmode )
+{
+    progress_filter_context_t pfx;
+    IOBUF fp;
+    STRLIST sl;
+
+    if( !files ) {
+       /* check whether we can open the signed material */
+       fp = open_sigfile( sigfilename, &pfx );
+       if( fp ) {
+           do_hash( md, md2, fp, textmode );
+           iobuf_close(fp);
+           return 0;
+       }
+        log_error (_("no signed data\n"));
+        return G10ERR_OPEN_FILE;
+    }
+
+
+    for (sl=files; sl; sl = sl->next ) {
+       fp = iobuf_open( sl->d );
+        if (fp && is_secured_file (iobuf_get_fd (fp)))
+          {
+            iobuf_close (fp);
+            fp = NULL;
+            errno = EPERM;
+          }
+       if( !fp ) {
+           log_error(_("can't open signed data `%s'\n"),
+                                               print_fname_stdin(sl->d));
+           return G10ERR_OPEN_FILE;
+       }
+        handle_progress (&pfx, fp, sl->d);
+       do_hash( md, md2, fp, textmode );
+       iobuf_close(fp);
+    }
+
+    return 0;
+}