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|
/* 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)
{
fprintf(stderr,"Cannot open key file %s: %s\n",keyfile,strerror(errno));
return 1;
}
err=fstat(fd,&statbuf);
if(err==-1)
{
fprintf(stderr,"Unable to stat key file %s: %s\n",
keyfile,strerror(errno));
goto fail;
}
if(statbuf.st_size>65536)
{
fprintf(stderr,"Key %s too large for CERT encoding\n",keyfile);
goto fail;
}
if(statbuf.st_size>16384)
fprintf(stderr,"Warning: key file %s is larger than the default"
" GnuPG max-cert-size\n",keyfile);
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)
{
fprintf(stderr,"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)
{
const char *tmp = fpr;
while (*tmp)
{
if ((*tmp >= 'A' && *tmp <= 'F') ||
(*tmp >= 'a' && *tmp <= 'f') ||
(*tmp >= '0' && *tmp <= '9'))
{
fprlen++;
}
else if (*tmp != ' ' && *tmp != '\t')
{
fprintf(stderr,"Fingerprint must consist of only hex digits"
" and whitespace\n");
return 1;
}
tmp++;
}
if(fprlen%2)
{
fprintf(stderr,"Fingerprint must be an even number of characters\n");
return 1;
}
fprlen/=2;
len+=fprlen;
}
if(url)
len+=strlen(url);
if(!fpr && !url)
{
fprintf(stderr,
"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(FILE *stream)
{
fprintf(stream,"make-dns-cert\n");
fprintf(stream,"\t-f\tfingerprint\n");
fprintf(stream,"\t-u\tURL\n");
fprintf(stream,"\t-k\tkey file\n");
fprintf(stream,"\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(stderr);
return 1;
}
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(stdout);
return 0;
}
while((arg=getopt(argc,argv,"hf:u:k:n:"))!=-1)
switch(arg)
{
default:
case 'h':
usage(stdout);
exit(0);
case 'f':
fpr=optarg;
break;
case 'u':
url=optarg;
break;
case 'k':
keyfile=optarg;
break;
case 'n':
name=optarg;
break;
}
if(!name)
{
fprintf(stderr,"No name provided\n");
return 1;
}
if(keyfile && (fpr || url))
{
fprintf(stderr,"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;
}
|
