mirror of
git://git.gnupg.org/gnupg.git
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413 lines
8.4 KiB
C
413 lines
8.4 KiB
C
/* gpgkeys_http.c - fetch a key via HTTP
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* 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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#define INCLUDED_BY_MAIN_MODULE 1
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#include "util.h"
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#include "http.h"
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#include "keyserver.h"
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#include "ksutil.h"
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#define GET 0
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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 unsigned int http_flags=0;
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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 proxy[MAX_PROXY+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 FILE *input,*output,*console;
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#ifdef __riscos__
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#define HTTP_PROXY_ENV "GnuPG$HttpProxy"
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#else
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#define HTTP_PROXY_ENV "http_proxy"
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#endif
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static int
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get_key(char *getkey)
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{
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int rc;
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char *request;
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struct http_context hd;
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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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request=malloc(4+3+strlen(host)+1+strlen(port)+1+strlen(path)+50);
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if(!request)
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{
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fprintf(console,"gpgkeys: out of memory\n");
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return KEYSERVER_NO_MEMORY;
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}
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sprintf(request,"http://%s%s%s%s%s%s%s",auth[0]?auth:"",auth[0]?"@":"",
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host,port[0]?":":"",port[0]?port:"",path[0]?"":"/",path);
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rc=http_open_document(&hd,request,http_flags,proxy[0]?proxy:NULL);
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if(rc!=0)
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{
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fprintf(console,"gpgkeys: HTTP fetch error: %s\n",
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rc==G10ERR_NETWORK?strerror(errno):g10_errstr(rc));
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fprintf(output,"KEY 0x%s FAILED %d\n",getkey,
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rc==G10ERR_NETWORK?KEYSERVER_UNREACHABLE:KEYSERVER_INTERNAL_ERROR);
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}
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else
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{
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unsigned int maxlen=1024,buflen,gotit=0;
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byte *line=NULL;
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while(iobuf_read_line(hd.fp_read,&line,&buflen,&maxlen))
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{
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maxlen=1024;
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if(gotit)
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{
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print_nocr(output,line);
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if(strncmp(line,END,strlen(END))==0)
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break;
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}
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else
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if(strncmp(line,BEGIN,strlen(BEGIN))==0)
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{
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print_nocr(output,line);
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gotit=1;
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}
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}
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if(gotit)
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fprintf(output,"KEY 0x%s END\n",getkey);
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else
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{
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fprintf(console,"gpgkeys: key %s not found on keyserver\n",getkey);
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fprintf(output,"KEY 0x%s FAILED %d\n",
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getkey,KEYSERVER_KEY_NOT_FOUND);
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}
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m_free(line);
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http_close(&hd);
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}
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free(request);
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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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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_http (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,"w");
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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,"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],79);
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proxy[79]='\0';
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}
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else if(start[10]=='\0')
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{
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char *http_proxy=getenv(HTTP_PROXY_ENV);
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if(http_proxy)
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{
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strncpy(proxy,http_proxy,79);
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proxy[79]='\0';
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}
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}
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}
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else if(strcasecmp(start,"broken-http-proxy")==0)
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{
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if(no)
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http_flags&=~HTTP_FLAG_NO_SHUTDOWN;
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else
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http_flags|=HTTP_FLAG_NO_SHUTDOWN;
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}
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else if(strcasecmp(start,"try-dns-srv")==0)
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{
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if(no)
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http_flags&=~HTTP_FLAG_TRY_SRV;
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else
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http_flags|=HTTP_FLAG_TRY_SRV;
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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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continue;
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}
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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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/* By suggested convention, if the user gives a :port, then disable
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SRV. */
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if(port[0])
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http_flags&=~HTTP_FLAG_TRY_SRV;
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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>1)
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{
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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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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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return ret;
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}
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