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ca6c57bc8a
gnupg/keyserver/gpgkeys_http.c
Werner Koch a1cdf3c75f Converted all m_free to xfree etc.
2005-07-27 18:10:56 +00:00

408 lines
8.3 KiB
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/* gpgkeys_http.c - fetch a key via HTTP
* Copyright (C) 2004, 2005 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
#define INCLUDED_BY_MAIN_MODULE 1
#include "util.h"
#include "http.h"
#include "keyserver.h"
#include "ksutil.h"
#define GET 0
extern char *optarg;
extern int optind;
static int verbose=0;
static unsigned int http_flags=0;
static char auth[MAX_AUTH+1];
static char host[MAX_HOST+1];
static char proxy[MAX_PROXY+1];
static char port[MAX_PORT+1];
static char path[URLMAX_PATH+1];
static FILE *input,*output,*console;
static int
get_key(char *getkey)
{
int rc;
char *request;
struct http_context hd;
if(strncmp(getkey,"0x",2)==0)
getkey+=2;
fprintf(output,"KEY 0x%s BEGIN\n",getkey);
request=malloc(4+3+strlen(host)+1+strlen(port)+1+strlen(path)+50);
if(!request)
{
fprintf(console,"gpgkeys: out of memory\n");
return KEYSERVER_NO_MEMORY;
}
sprintf(request,"http://%s%s%s%s%s",host,
port[0]?":":"",port[0]?port:"",path[0]?"":"/",path);
rc=http_open_document(&hd,request,auth[0]?auth:NULL,
http_flags,proxy[0]?proxy:NULL);
if(rc!=0)
{
fprintf(console,"gpgkeys: HTTP fetch error: %s\n",
rc==G10ERR_NETWORK?strerror(errno):g10_errstr(rc));
fprintf(output,"KEY 0x%s FAILED %d\n",getkey,
rc==G10ERR_NETWORK?KEYSERVER_UNREACHABLE:KEYSERVER_INTERNAL_ERROR);
}
else
{
unsigned int maxlen=1024,buflen,gotit=0;
byte *line=NULL;
while(iobuf_read_line(hd.fp_read,&line,&buflen,&maxlen))
{
maxlen=1024;
if(gotit)
{
print_nocr(output,line);
if(strncmp(line,END,strlen(END))==0)
break;
}
else
if(strncmp(line,BEGIN,strlen(BEGIN))==0)
{
print_nocr(output,line);
gotit=1;
}
}
if(gotit)
fprintf(output,"KEY 0x%s END\n",getkey);
else
{
fprintf(console,"gpgkeys: key %s not found on keyserver\n",getkey);
fprintf(output,"KEY 0x%s FAILED %d\n",
getkey,KEYSERVER_KEY_NOT_FOUND);
}
xfree(line);
http_close(&hd);
}
free(request);
return KEYSERVER_OK;
}
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,action=-1,ret=KEYSERVER_INTERNAL_ERROR;
char line[MAX_LINE];
char *thekey=NULL;
unsigned int timeout=DEFAULT_KEYSERVER_TIMEOUT;
console=stderr;
/* Kludge to implement standard GNU options. */
if (argc > 1 && !strcmp (argv[1], "--version"))
{
fputs ("gpgkeys_http (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,"w");
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;
/* Get the command and info block */
while(fgets(line,MAX_LINE,input)!=NULL)
{
int version;
char command[MAX_COMMAND+1];
char option[MAX_OPTION+1];
char hash;
if(line[0]=='\n')
break;
if(sscanf(line,"%c",&hash)==1 && hash=='#')
continue;
if(sscanf(line,"COMMAND %" MKSTRING(MAX_COMMAND) "s\n",command)==1)
{
command[MAX_COMMAND]='\0';
if(strcasecmp(command,"get")==0)
action=GET;
continue;
}
if(sscanf(line,"AUTH %" MKSTRING(MAX_AUTH) "s\n",auth)==1)
{
auth[MAX_AUTH]='\0';
continue;
}
if(sscanf(line,"HOST %" MKSTRING(MAX_HOST) "s\n",host)==1)
{
host[MAX_HOST]='\0';
continue;
}
if(sscanf(line,"PORT %" MKSTRING(MAX_PORT) "s\n",port)==1)
{
port[MAX_PORT]='\0';
continue;
}
if(sscanf(line,"PATH %" MKSTRING(URLMAX_PATH) "s\n",path)==1)
{
path[URLMAX_PATH]='\0';
continue;
}
if(sscanf(line,"VERSION %d\n",&version)==1)
{
if(version!=KEYSERVER_PROTO_VERSION)
{
ret=KEYSERVER_VERSION_ERROR;
goto fail;
}
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(strcasecmp(start,"verbose")==0)
{
if(no)
verbose--;
else
verbose++;
}
else if(strncasecmp(start,"http-proxy",10)==0)
{
if(no)
proxy[0]='\0';
else if(start[10]=='=')
{
strncpy(proxy,&start[11],79);
proxy[79]='\0';
}
else if(start[10]=='\0')
{
char *http_proxy=getenv(HTTP_PROXY_ENV);
if(http_proxy)
{
strncpy(proxy,http_proxy,79);
proxy[79]='\0';
}
}
}
else if(strcasecmp(start,"broken-http-proxy")==0)
{
if(no)
http_flags&=~HTTP_FLAG_NO_SHUTDOWN;
else
http_flags|=HTTP_FLAG_NO_SHUTDOWN;
}
else if(strcasecmp(start,"try-dns-srv")==0)
{
if(no)
http_flags&=~HTTP_FLAG_TRY_SRV;
else
http_flags|=HTTP_FLAG_TRY_SRV;
}
else if(strncasecmp(start,"timeout",7)==0)
{
if(no)
timeout=0;
else if(start[7]=='=')
timeout=atoi(&start[8]);
else if(start[7]=='\0')
timeout=DEFAULT_KEYSERVER_TIMEOUT;
}
continue;
}
}
if(timeout && register_timeout()==-1)
{
fprintf(console,"gpgkeys: unable to register timeout handler\n");
return KEYSERVER_INTERNAL_ERROR;
}
/* By suggested convention, if the user gives a :port, then disable
SRV. */
if(port[0])
http_flags&=~HTTP_FLAG_TRY_SRV;
/* 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(action==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 || !host[0])
{
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(verbose>1)
{
fprintf(console,"Host:\t\t%s\n",host);
if(port[0])
fprintf(console,"Port:\t\t%s\n",port);
if(path[0])
fprintf(console,"Path:\t\t%s\n",path);
fprintf(console,"Command:\tGET\n");
}
set_timeout(timeout);
ret=get_key(thekey);
fail:
free(thekey);
if(input!=stdin)
fclose(input);
if(output!=stdout)
fclose(output);
return ret;
}
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