mirror of
git://git.gnupg.org/gnupg.git
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424 lines
8.9 KiB
C
424 lines
8.9 KiB
C
/* gpgkeys_curl.c - fetch a key via libcurl
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* Copyright (C) 2004, 2005 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#endif
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#include <curl/curl.h>
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#include "keyserver.h"
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#include "ksutil.h"
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extern char *optarg;
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extern int optind;
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static int verbose=0;
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static char scheme[MAX_SCHEME+1];
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static char auth[MAX_AUTH+1];
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static char host[MAX_HOST+1];
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static char port[MAX_PORT+1];
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static char path[URLMAX_PATH+1];
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static char proxy[MAX_PROXY+1];
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static FILE *input, *output, *console;
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static CURL *curl;
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static char request[MAX_URL];
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static int
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curl_err_to_gpg_err(CURLcode error)
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{
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switch(error)
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{
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case CURLE_FTP_COULDNT_RETR_FILE: return KEYSERVER_KEY_NOT_FOUND;
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default: return KEYSERVER_INTERNAL_ERROR;
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}
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}
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/* We wrap fwrite so to avoid DLL problems on Win32 (see curl faq for
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more). */
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static size_t
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writer(const void *ptr,size_t size,size_t nmemb,void *stream)
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{
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return fwrite(ptr,size,nmemb,stream);
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}
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static int
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get_key(char *getkey)
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{
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CURLcode res;
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char errorbuffer[CURL_ERROR_SIZE];
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if(strncmp(getkey,"0x",2)==0)
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getkey+=2;
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fprintf(output,"KEY 0x%s BEGIN\n",getkey);
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sprintf(request,"%s://%s%s%s%s%s%s%s",scheme,auth[0]?auth:"",auth[0]?"@":"",
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host,port[0]?":":"",port[0]?port:"",path[0]?"":"/",path);
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curl_easy_setopt(curl,CURLOPT_URL,request);
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curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,writer);
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curl_easy_setopt(curl,CURLOPT_FILE,output);
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curl_easy_setopt(curl,CURLOPT_ERRORBUFFER,errorbuffer);
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if(verbose>1)
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{
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curl_easy_setopt(curl,CURLOPT_STDERR,console);
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curl_easy_setopt(curl,CURLOPT_VERBOSE,1);
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}
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res=curl_easy_perform(curl);
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if(res!=0)
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{
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fprintf(console,"gpgkeys: %s fetch error %d: %s\n",scheme,
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res,errorbuffer);
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fprintf(output,"KEY 0x%s FAILED %d\n",getkey,curl_err_to_gpg_err(res));
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}
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else
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fprintf(output,"KEY 0x%s END\n",getkey);
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return KEYSERVER_OK;
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}
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static void
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show_help (FILE *fp)
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{
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fprintf (fp,"-h\thelp\n");
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fprintf (fp,"-V\tversion\n");
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fprintf (fp,"-o\toutput to this file\n");
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}
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int
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main(int argc,char *argv[])
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{
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int arg,action=-1,ret=KEYSERVER_INTERNAL_ERROR;
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char line[MAX_LINE];
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char *thekey=NULL;
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unsigned int timeout=DEFAULT_KEYSERVER_TIMEOUT;
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long follow_redirects=5;
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console=stderr;
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/* Kludge to implement standard GNU options. */
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if (argc > 1 && !strcmp (argv[1], "--version"))
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{
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fputs ("gpgkeys_curl (GnuPG) " VERSION"\n", stdout);
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return 0;
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}
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else if (argc > 1 && !strcmp (argv[1], "--help"))
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{
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show_help (stdout);
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return 0;
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}
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while((arg=getopt(argc,argv,"hVo:"))!=-1)
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switch(arg)
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{
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default:
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case 'h':
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show_help (console);
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return KEYSERVER_OK;
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case 'V':
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fprintf(stdout,"%d\n%s\n",KEYSERVER_PROTO_VERSION,VERSION);
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return KEYSERVER_OK;
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case 'o':
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output=fopen(optarg,"wb");
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if(output==NULL)
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{
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fprintf(console,"gpgkeys: Cannot open output file `%s': %s\n",
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optarg,strerror(errno));
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return KEYSERVER_INTERNAL_ERROR;
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}
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break;
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}
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if(argc>optind)
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{
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input=fopen(argv[optind],"r");
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if(input==NULL)
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{
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fprintf(console,"gpgkeys: Cannot open input file `%s': %s\n",
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argv[optind],strerror(errno));
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return KEYSERVER_INTERNAL_ERROR;
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}
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}
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if(input==NULL)
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input=stdin;
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if(output==NULL)
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output=stdout;
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/* Get the command and info block */
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while(fgets(line,MAX_LINE,input)!=NULL)
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{
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int version;
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char command[MAX_COMMAND+1];
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char option[MAX_OPTION+1];
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char hash;
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if(line[0]=='\n')
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break;
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if(sscanf(line,"%c",&hash)==1 && hash=='#')
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continue;
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if(sscanf(line,"COMMAND %" MKSTRING(MAX_COMMAND) "s\n",command)==1)
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{
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command[MAX_COMMAND]='\0';
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if(strcasecmp(command,"get")==0)
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action=GET;
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continue;
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}
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if(sscanf(line,"SCHEME %" MKSTRING(MAX_SCHEME) "s\n",scheme)==1)
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{
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scheme[MAX_SCHEME]='\0';
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continue;
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}
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if(sscanf(line,"AUTH %" MKSTRING(MAX_AUTH) "s\n",auth)==1)
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{
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auth[MAX_AUTH]='\0';
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continue;
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}
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if(sscanf(line,"HOST %" MKSTRING(MAX_HOST) "s\n",host)==1)
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{
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host[MAX_HOST]='\0';
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continue;
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}
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if(sscanf(line,"PORT %" MKSTRING(MAX_PORT) "s\n",port)==1)
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{
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port[MAX_PORT]='\0';
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continue;
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}
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if(sscanf(line,"PATH %" MKSTRING(URLMAX_PATH) "s\n",path)==1)
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{
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path[URLMAX_PATH]='\0';
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continue;
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}
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if(sscanf(line,"VERSION %d\n",&version)==1)
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{
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if(version!=KEYSERVER_PROTO_VERSION)
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{
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ret=KEYSERVER_VERSION_ERROR;
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goto fail;
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}
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continue;
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}
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if(sscanf(line,"OPTION %" MKSTRING(MAX_OPTION) "s\n",option)==1)
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{
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int no=0;
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char *start=&option[0];
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option[MAX_OPTION]='\0';
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if(strncasecmp(option,"no-",3)==0)
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{
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no=1;
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start=&option[3];
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}
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if(strcasecmp(start,"verbose")==0)
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{
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if(no)
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verbose--;
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else
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verbose++;
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}
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else if(strncasecmp(start,"http-proxy",10)==0)
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{
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if(no)
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proxy[0]='\0';
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else if(start[10]=='=')
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{
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strncpy(proxy,&start[11],MAX_PROXY);
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proxy[MAX_PROXY]='\0';
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}
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}
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else if(strncasecmp(start,"timeout",7)==0)
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{
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if(no)
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timeout=0;
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else if(start[7]=='=')
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timeout=atoi(&start[8]);
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else if(start[7]=='\0')
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timeout=DEFAULT_KEYSERVER_TIMEOUT;
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}
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else if(strncasecmp(start,"follow-redirects",16)==0)
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{
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if(no)
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follow_redirects=0;
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else if(start[16]=='=')
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follow_redirects=atoi(&start[17]);
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else if(start[16]=='\0')
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follow_redirects=-1;
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}
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continue;
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}
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}
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if(scheme[0]=='\0')
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{
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fprintf(console,"gpgkeys: no scheme supplied!\n");
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return KEYSERVER_SCHEME_NOT_FOUND;
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}
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#ifdef HTTP_VIA_LIBCURL
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else if(strcasecmp(scheme,"http")==0)
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;
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#endif /* HTTP_VIA_LIBCURL */
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#ifdef HTTPS_VIA_LIBCURL
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else if(strcasecmp(scheme,"https")==0)
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;
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#endif /* HTTP_VIA_LIBCURL */
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#ifdef FTP_VIA_LIBCURL
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else if(strcasecmp(scheme,"ftp")==0)
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;
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#endif /* FTP_VIA_LIBCURL */
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else
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{
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fprintf(console,"gpgkeys: scheme `%s' not supported\n",scheme);
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return KEYSERVER_SCHEME_NOT_FOUND;
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}
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if(timeout && register_timeout()==-1)
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{
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fprintf(console,"gpgkeys: unable to register timeout handler\n");
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return KEYSERVER_INTERNAL_ERROR;
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}
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curl_global_init(CURL_GLOBAL_DEFAULT);
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curl=curl_easy_init();
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if(!curl)
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{
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fprintf(console,"gpgkeys: unable to initialize curl\n");
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ret=KEYSERVER_INTERNAL_ERROR;
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goto fail;
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}
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if(follow_redirects)
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{
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curl_easy_setopt(curl,CURLOPT_FOLLOWLOCATION,1);
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if(follow_redirects>0)
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curl_easy_setopt(curl,CURLOPT_MAXREDIRS,follow_redirects);
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}
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if(proxy[0])
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curl_easy_setopt(curl,CURLOPT_PROXY,proxy);
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/* If it's a GET or a SEARCH, the next thing to come in is the
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keyids. If it's a SEND, then there are no keyids. */
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if(action==GET)
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{
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/* Eat the rest of the file */
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for(;;)
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{
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if(fgets(line,MAX_LINE,input)==NULL)
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break;
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else
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{
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if(line[0]=='\n' || line[0]=='\0')
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break;
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if(!thekey)
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{
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thekey=strdup(line);
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if(!thekey)
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{
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fprintf(console,"gpgkeys: out of memory while "
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"building key list\n");
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ret=KEYSERVER_NO_MEMORY;
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goto fail;
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}
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/* Trim the trailing \n */
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thekey[strlen(line)-1]='\0';
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}
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}
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}
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}
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else
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{
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fprintf(console,
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"gpgkeys: this keyserver type only supports key retrieval\n");
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goto fail;
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}
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if(!thekey || !host[0])
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{
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fprintf(console,"gpgkeys: invalid keyserver instructions\n");
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goto fail;
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}
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/* Send the response */
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fprintf(output,"VERSION %d\n",KEYSERVER_PROTO_VERSION);
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fprintf(output,"PROGRAM %s\n\n",VERSION);
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if(verbose)
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{
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fprintf(console,"Scheme:\t\t%s\n",scheme);
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fprintf(console,"Host:\t\t%s\n",host);
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if(port[0])
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fprintf(console,"Port:\t\t%s\n",port);
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if(path[0])
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fprintf(console,"Path:\t\t%s\n",path);
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fprintf(console,"Command:\tGET\n");
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}
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set_timeout(timeout);
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ret=get_key(thekey);
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curl_easy_cleanup(curl);
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fail:
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free(thekey);
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if(input!=stdin)
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fclose(input);
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if(output!=stdout)
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fclose(output);
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curl_global_cleanup();
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return ret;
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}
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