diff options
Diffstat (limited to 'tools/make-dns-cert.c')
| -rw-r--r-- | tools/make-dns-cert.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/tools/make-dns-cert.c b/tools/make-dns-cert.c new file mode 100644 index 0000000..496b63b --- /dev/null +++ b/tools/make-dns-cert.c @@ -0,0 +1,239 @@ +/* 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; +} |