* make-dns-cert.c: New program to generate properly formatted CERT records

so people don't have to do it manually.

tools/ChangeLog

@@ -1,3 +1,8 @@
+2006-04-04  David Shaw  <dshaw@jabberwocky.com>
+
+	* make-dns-cert.c: New program to generate properly formatted CERT
+	records so people don't have to do it manually.
+
 2006-02-14  Werner Koch  <wk@gnupg.org>
 
 	* mk-tdata.c (main): Implement option --char.

tools/Makefile.am

@@ -25,7 +25,7 @@ needed_libs = ../cipher/libcipher.a ../mpi/libmpi.a ../util/libutil.a
 other_libs = $(LIBICONV) $(LIBINTL) $(CAPLIBS)
 
 bin_PROGRAMS    = gpgsplit
-noinst_PROGRAMS = mpicalc bftest clean-sat mk-tdata shmtest
+noinst_PROGRAMS = mpicalc bftest clean-sat mk-tdata shmtest make-dns-cert
 
 if HAVE_USTAR
 bin_SCRIPTS = gpg-zip

tools/make-dns-cert.c

@@ -0,0 +1,214 @@
+/* make-dns-cert.c - An OpenPGP-to-DNS CERT conversion tool
+ * Copyright (C) 2006 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
+ */
+
+#include <config.h>
+#include <unistd.h>
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+/* We use TYPE37 instead of CERT since not all nameservers can handle
+   CERT yet... */
+
+static int
+cert_key(const char *name,const char *keyfile)
+{
+  int fd,ret=1,err,i;
+  struct stat statbuf;
+
+  fd=open(keyfile,O_RDONLY);
+  if(fd==-1)
+    {
+      printf("Cannot open key file %s: %s\n",keyfile,strerror(errno));
+      return 1;
+    }
+
+  err=fstat(fd,&statbuf);
+  if(err==-1)
+    {
+      printf("Unable to stat key file %s: %s\n",keyfile,strerror(errno));
+      goto fail;
+    }
+
+  if(statbuf.st_size>32768)
+    {
+      printf("Key %s too large for CERT encoding\n",keyfile);
+      goto fail;
+    }
+
+  printf("%s\tTYPE37\t\\# %u 0003 0000 00 ",
+	 name,(unsigned int)statbuf.st_size+5);
+
+  err=1;
+  while(err!=0)
+    {
+      unsigned char buffer[1024];
+
+      err=read(fd,buffer,1024);
+      if(err==-1)
+	{
+	  printf("Unable to read key file %s: %s\n",keyfile,strerror(errno));
+	  goto fail;
+	}
+
+      for(i=0;i<err;i++)
+	printf("%02X",buffer[i]);
+    }
+
+  printf("\n");
+
+  ret=0;
+
+ fail:
+  close(fd);
+
+  return ret;
+}
+
+static int
+url_key(const char *name,const char *fpr,const char *url)
+{
+  int len=6,fprlen=0;
+
+  if(fpr)
+    {
+      fprlen=strlen(fpr);
+      if(fprlen%2)
+	{
+	  printf("Fingerprint must be an even number of characters\n");
+	  return 1;
+	}
+
+      fprlen/=2;
+      len+=fprlen;
+    }
+
+  if(url)
+    len+=strlen(url);
+
+  if(!fpr && !url)
+    {
+      printf("Cannot generate a CERT without either a fingerprint or URL\n");
+      return 1;
+    }
+
+  printf("%s\tTYPE37\t\\# %d 0006 0000 00 %02X",name,len,fprlen);
+
+  if(fpr)
+    printf(" %s",fpr);
+
+  if(url)
+    {
+      const char *c;
+      printf(" ");
+      for(c=url;*c;c++)
+	printf("%02X",*c);
+    }
+
+  printf("\n");
+
+  return 0;
+}
+
+static void
+usage(void)
+{
+  printf("make-dns-cert\n");
+  printf("\t-f\tfingerprint\n");
+  printf("\t-u\tURL\n");
+  printf("\t-k\tkey file\n");
+  printf("\t-n\tDNS name\n");
+}
+
+int
+main(int argc,char *argv[])
+{
+  int arg,err=1;
+  char *fpr=NULL,*url=NULL,*keyfile=NULL,*name=NULL;
+
+  if(argc==1)
+    {
+      usage();
+      return 0;
+    }
+  else if(argc>1 && strcmp(argv[1],"--version")==0)
+    {
+      printf("make-dns-cert (GnuPG) " VERSION "\n");
+      return 0;
+    }
+  else if(argc>1 && strcmp(argv[1],"--help")==0)
+    {
+      usage();
+      return 0;
+    }
+
+  while((arg=getopt(argc,argv,"hf:u:k:n:"))!=-1)
+    switch(arg)
+      {
+      default:
+      case 'h':
+	usage();
+	exit(0);
+
+      case 'f':
+	fpr=optarg;
+	break;
+
+      case 'u':
+	url=optarg;
+	break;
+
+      case 'k':
+	keyfile=optarg;
+	break;
+
+      case 'n':
+	name=optarg;
+	break;
+      }
+
+  if(!name)
+    {
+      printf("No name provided\n");
+      return 1;
+    }
+
+  if(keyfile && (fpr || url))
+    {
+      printf("Cannot generate a CERT record with both a keyfile and"
+	     " a fingerprint or URL\n");
+      return 1;
+    }
+
+  if(keyfile)
+    err=cert_key(name,keyfile);
+  else
+    err=url_key(name,fpr,url);
+
+  return err;
+}