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gnupg/keyserver/gpgkeys_curl.c

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/* gpgkeys_curl.c - fetch a key via libcurl
* Copyright (C) 2004, 2005, 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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#ifdef HAVE_LIBCURL
#include <curl/curl.h>
#else
#include "curl-shim.h"
#endif
#include "keyserver.h"
#include "ksutil.h"
extern char *optarg;
extern int optind;
static FILE *input,*output,*console;
static CURL *curl;
static struct ks_options *opt;
static int
get_key(char *getkey)
{
CURLcode res;
char errorbuffer[CURL_ERROR_SIZE];
char request[MAX_URL];
struct curl_writer_ctx ctx;
memset(&ctx,0,sizeof(ctx));
if(strncmp(getkey,"0x",2)==0)
getkey+=2;
fprintf(output,"KEY 0x%s BEGIN\n",getkey);
sprintf(request,"%s://%s%s%s%s",opt->scheme,opt->host,
opt->port?":":"",opt->port?opt->port:"",opt->path?opt->path:"/");
curl_easy_setopt(curl,CURLOPT_URL,request);
curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,curl_writer);
ctx.stream=output;
curl_easy_setopt(curl,CURLOPT_FILE,&ctx);
curl_easy_setopt(curl,CURLOPT_ERRORBUFFER,errorbuffer);
res=curl_easy_perform(curl);
if(res!=CURLE_OK)
{
fprintf(console,"gpgkeys: %s fetch error %d: %s\n",opt->scheme,
res,errorbuffer);
fprintf(output,"\nKEY 0x%s FAILED %d\n",getkey,curl_err_to_gpg_err(res));
}
else
{
curl_writer_finalize(&ctx);
if(!ctx.flags.done)
{
fprintf(console,"gpgkeys: no key data found for %s\n",request);
fprintf(output,"\nKEY 0x%s FAILED %d\n",
getkey,KEYSERVER_KEY_NOT_FOUND);
}
else
fprintf(output,"\nKEY 0x%s END\n",getkey);
}
return curl_err_to_gpg_err(res);
}
static void
show_help (FILE *fp)
{
fprintf (fp,"-h\thelp\n");
fprintf (fp,"-V\tversion\n");
fprintf (fp,"-o\toutput to this file\n");
}
int
main(int argc,char *argv[])
{
int arg,ret=KEYSERVER_INTERNAL_ERROR;
char line[MAX_LINE];
char *thekey=NULL;
long follow_redirects=5;
char *proxy=NULL;
console=stderr;
/* Kludge to implement standard GNU options. */
if (argc > 1 && !strcmp (argv[1], "--version"))
{
fputs ("gpgkeys_curl (GnuPG) " VERSION"\n", stdout);
return 0;
}
else if (argc > 1 && !strcmp (argv[1], "--help"))
{
show_help (stdout);
return 0;
}
while((arg=getopt(argc,argv,"hVo:"))!=-1)
switch(arg)
{
default:
case 'h':
show_help (console);
return KEYSERVER_OK;
case 'V':
fprintf(stdout,"%d\n%s\n",KEYSERVER_PROTO_VERSION,VERSION);
return KEYSERVER_OK;
case 'o':
output=fopen(optarg,"wb");
if(output==NULL)
{
fprintf(console,"gpgkeys: Cannot open output file `%s': %s\n",
optarg,strerror(errno));
return KEYSERVER_INTERNAL_ERROR;
}
break;
}
if(argc>optind)
{
input=fopen(argv[optind],"r");
if(input==NULL)
{
fprintf(console,"gpgkeys: Cannot open input file `%s': %s\n",
argv[optind],strerror(errno));
return KEYSERVER_INTERNAL_ERROR;
}
}
if(input==NULL)
input=stdin;
if(output==NULL)
output=stdout;
opt=init_ks_options();
if(!opt)
return KEYSERVER_NO_MEMORY;
/* Get the command and info block */
while(fgets(line,MAX_LINE,input)!=NULL)
{
int err;
char option[MAX_OPTION+1];
if(line[0]=='\n')
break;
err=parse_ks_options(line,opt);
if(err>0)
{
ret=err;
goto fail;
}
else if(err==0)
continue;
if(sscanf(line,"OPTION %" MKSTRING(MAX_OPTION) "s\n",option)==1)
{
int no=0;
char *start=&option[0];
option[MAX_OPTION]='\0';
if(strncasecmp(option,"no-",3)==0)
{
no=1;
start=&option[3];
}
if(strncasecmp(start,"http-proxy",10)==0)
{
/* Safe to not check the return code of strdup() here.
If it fails, we simply won't use a proxy. */
if(no)
{
free(proxy);
proxy=strdup("");
}
else if(start[10]=='=')
{
if(strlen(&start[11])<MAX_PROXY)
{
free(proxy);
proxy=strdup(&start[11]);
}
}
}
else if(strncasecmp(start,"follow-redirects",16)==0)
{
if(no)
follow_redirects=0;
else if(start[16]=='=')
follow_redirects=atoi(&start[17]);
else if(start[16]=='\0')
follow_redirects=-1;
}
continue;
}
}
if(!opt->scheme)
{
fprintf(console,"gpgkeys: no scheme supplied!\n");
ret=KEYSERVER_SCHEME_NOT_FOUND;
goto fail;
}
if(!opt->host)
{
fprintf(console,"gpgkeys: no keyserver host provided\n");
goto fail;
}
if(opt->timeout && register_timeout()==-1)
{
fprintf(console,"gpgkeys: unable to register timeout handler\n");
return KEYSERVER_INTERNAL_ERROR;
}
curl_global_init(CURL_GLOBAL_DEFAULT);
curl=curl_easy_init();
if(!curl)
{
fprintf(console,"gpgkeys: unable to initialize curl\n");
ret=KEYSERVER_INTERNAL_ERROR;
goto fail;
}
if(follow_redirects)
{
curl_easy_setopt(curl,CURLOPT_FOLLOWLOCATION,1);
if(follow_redirects>0)
curl_easy_setopt(curl,CURLOPT_MAXREDIRS,follow_redirects);
}
if(opt->auth)
curl_easy_setopt(curl,CURLOPT_USERPWD,opt->auth);
if(opt->debug)
{
fprintf(console,"gpgkeys: curl version = %s\n",curl_version());
curl_easy_setopt(curl,CURLOPT_STDERR,console);
curl_easy_setopt(curl,CURLOPT_VERBOSE,1);
}
curl_easy_setopt(curl,CURLOPT_SSL_VERIFYPEER,opt->flags.check_cert);
curl_easy_setopt(curl,CURLOPT_CAINFO,opt->ca_cert_file);
if(proxy)
curl_easy_setopt(curl,CURLOPT_PROXY,proxy);
/* If it's a GET or a SEARCH, the next thing to come in is the
keyids. If it's a SEND, then there are no keyids. */
if(opt->action==KS_GET)
{
/* Eat the rest of the file */
for(;;)
{
if(fgets(line,MAX_LINE,input)==NULL)
break;
else
{
if(line[0]=='\n' || line[0]=='\0')
break;
if(!thekey)
{
thekey=strdup(line);
if(!thekey)
{
fprintf(console,"gpgkeys: out of memory while "
"building key list\n");
ret=KEYSERVER_NO_MEMORY;
goto fail;
}
/* Trim the trailing \n */
thekey[strlen(line)-1]='\0';
}
}
}
}
else
{
fprintf(console,
"gpgkeys: this keyserver type only supports key retrieval\n");
goto fail;
}
if(!thekey)
{
fprintf(console,"gpgkeys: invalid keyserver instructions\n");
goto fail;
}
/* Send the response */
fprintf(output,"VERSION %d\n",KEYSERVER_PROTO_VERSION);
fprintf(output,"PROGRAM %s\n\n",VERSION);
if(opt->verbose)
{
fprintf(console,"Scheme:\t\t%s\n",opt->scheme);
fprintf(console,"Host:\t\t%s\n",opt->host);
if(opt->port)
fprintf(console,"Port:\t\t%s\n",opt->port);
if(opt->path)
fprintf(console,"Path:\t\t%s\n",opt->path);
fprintf(console,"Command:\tGET\n");
}
set_timeout(opt->timeout);
ret=get_key(thekey);
fail:
free(thekey);
if(input!=stdin)
fclose(input);
if(output!=stdout)
fclose(output);
free_ks_options(opt);
if(curl)
curl_easy_cleanup(curl);
free(proxy);
curl_global_cleanup();
return ret;
}
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