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gnupg/keyserver/gpgkeys_finger.c

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/* gpgkeys_finger.c - fetch a key via finger
* Copyright (C) 2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 _WIN32
#include <windows.h>
#else
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#endif
#define INCLUDED_BY_MAIN_MODULE 1
#include "util.h"
#include "keyserver.h"
#include "ksutil.h"
#ifdef _WIN32
#define sock_close(a) closesocket(a)
#else
#define sock_close(a) close(a)
#endif
extern char *optarg;
extern int optind;
#define GET 0
#define MAX_LINE 80
static int verbose=0;
static char path[1024];
static FILE *input, *output, *console;
#define BEGIN "-----BEGIN PGP PUBLIC KEY BLOCK-----"
#define END "-----END PGP PUBLIC KEY BLOCK-----"
#ifdef _WIN32
static void
deinit_sockets (void)
{
WSACleanup();
}
static void
init_sockets (void)
{
static int initialized;
static WSADATA wsdata;
if (initialized)
return;
if (WSAStartup (0x0101, &wsdata) )
{
fprintf (console, "error initializing socket library: ec=%d\n",
(int)WSAGetLastError () );
return;
}
if (wsdata.wVersion < 0x0001)
{
fprintf (console, "socket library version is %x.%x - but 1.1 needed\n",
LOBYTE(wsdata.wVersion), HIBYTE(wsdata.wVersion));
WSACleanup();
return;
}
atexit (deinit_sockets);
initialized = 1;
}
#endif /*_WIN32*/
/* Connect to SERVER at PORT and return a file descriptor or -1 on
error. */
static int
connect_server (const char *server, unsigned short port)
{
int sock = -1;
#ifdef _WIN32
struct hostent *hp;
struct sockaddr_in addr;
unsigned long l;
init_sockets ();
memset (&addr, 0, sizeof addr);
addr.sin_family = AF_INET;
addr.sin_port = htons (port);
/* Win32 gethostbyname doesn't handle IP addresses internally, so we
try inet_addr first on that platform only. */
if ((l = inet_addr (server)) != SOCKET_ERROR)
memcpy (&addr.sin_addr, &l, sizeof l);
else if ((hp = gethostbyname (server)))
{
if (hp->h_addrtype != AF_INET)
{
fprintf (console, "gpgkeys: unknown address family for `%s'\n",
server);
return -1;
}
if (hp->h_length != 4)
{
fprintf (console, "gpgkeys: illegal address length for `%s'\n",
server);
return -1;
}
memcpy (&addr.sin_addr, hp->h_addr, hp->h_length);
}
else
{
fprintf (console, "gpgkeys: host `%s' not found: ec=%d\n",
server, (int)WSAGetLastError ());
return -1;
}
sock = socket (AF_INET, SOCK_STREAM, 0);
if (sock == INVALID_SOCKET)
{
fprintf (console, "gpgkeys: error creating socket: ec=%d\n",
(int)WSAGetLastError ());
return -1;
}
if (connect (sock, (struct sockaddr *)&addr, sizeof addr))
{
fprintf (console, "gpgkeys: error connecting `%s': ec=%d\n",
server, (int)WSAGetLastError ());
sock_close (sock);
return -1;
}
#else
struct sockaddr_in addr;
struct hostent *host;
addr.sin_family = AF_INET;
addr.sin_port = htons (port);
host = gethostbyname ((char*)server);
if (!host)
{
fprintf (console, "gpgkeys: host `%s' not found: %s\n",
server, strerror (errno));
return -1;
}
addr.sin_addr = *(struct in_addr*)host->h_addr;
sock = socket (AF_INET, SOCK_STREAM, 0);
if (sock == -1)
{
fprintf (console, "gpgkeys: error creating socket: %s\n",
strerror (errno));
return -1;
}
if (connect (sock, (struct sockaddr *)&addr, sizeof addr) == -1)
{
fprintf (console, "gpgkeys: error connecting `%s': %s\n",
server, strerror (errno));
close (sock);
return -1;
}
#endif
return sock;
}
static int
write_server (int sock, const char *data, size_t length)
{
int nleft;
nleft = length;
while (nleft > 0)
{
int nwritten;
#ifdef _WIN32
nwritten = send (sock, data, nleft, 0);
if ( nwritten == SOCKET_ERROR )
{
fprintf (console, "gpgkeys: write failed: ec=%d\n",
(int)WSAGetLastError ());
return -1;
}
#else
nwritten = write (sock, data, nleft);
if (nwritten == -1)
{
if (errno == EINTR)
continue;
if (errno == EAGAIN)
{
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 50000;
select(0, NULL, NULL, NULL, &tv);
continue;
}
fprintf (console, "gpgkeys: write failed: %s\n", strerror(errno));
return -1;
}
#endif
nleft -=nwritten;
data += nwritten;
}
return 0;
}
/* Send the finger REQUEST to the server. Returns 0 and a file descriptor
in R_SOCK if the request was sucessful. */
static int
send_request (const char *request, int *r_sock)
{
char *server;
char *name;
int sock;
*r_sock = -1;
name = strdup (request);
if (!name)
{
fprintf(console,"gpgkeys: out of memory\n");
return KEYSERVER_NO_MEMORY;
}
server = strchr (name, '@');
if (!server)
{
fprintf (console, "gpgkeys: no name included in request\n");
free (name);
return KEYSERVER_GENERAL_ERROR;
}
*server++ = 0;
sock = connect_server (server, 79);
if (sock == -1)
{
free (name);
return KEYSERVER_UNREACHABLE;
}
if (write_server (sock, name, strlen (name))
|| write_server (sock, "\r\n", 2))
{
free (name);
sock_close (sock);
return KEYSERVER_GENERAL_ERROR;
}
free (name);
*r_sock = sock;
return 0;
}
static int
get_key (char *getkey)
{
int rc;
int sock;
IOBUF fp_read;
unsigned int maxlen, buflen, gotit=0;
byte *line = NULL;
if (strncmp (getkey,"0x",2)==0)
getkey+=2;
/* Frankly we don't know what keys the server will return; we
indicated the requested key anyway. */
fprintf(output,"KEY 0x%s BEGIN\n",getkey);
rc = send_request (path, &sock);
if(rc)
{
fprintf(output,"KEY 0x%s FAILED %d\n",getkey, rc);
sock_close (sock);
return KEYSERVER_OK;
}
/* Hmmm, we use iobuf here only to cope with Windows socket
peculiarities (we can't used fdopen). */
fp_read = iobuf_sockopen (sock , "r");
if (!fp_read)
{
fprintf(output,"KEY 0x%s FAILED %d\n",getkey, KEYSERVER_INTERNAL_ERROR);
sock_close (sock);
return KEYSERVER_OK;
}
while ( iobuf_read_line ( fp_read, &line, &buflen, &maxlen))
{
maxlen=1024;
if(gotit)
{
fputs (line, output);
if (!strncmp(line,END,strlen(END)))
break;
}
else if(!strncmp(line,BEGIN,strlen(BEGIN)))
{
fputs (line,output);
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);
}
m_free(line);
iobuf_close (fp_read);
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_ldap (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 commandstr[7];
char optionstr[256];
char hash;
if(line[0]=='\n')
break;
if(sscanf(line,"%c",&hash)==1 && hash=='#')
continue;
if(sscanf(line,"COMMAND %6s\n",commandstr)==1)
{
commandstr[6]='\0';
if(strcasecmp(commandstr,"get")==0)
action=GET;
continue;
}
if(strncmp(line,"HOST ",5)==0)
{
fprintf(console,"gpgkeys: finger://relay/user syntax is not"
" supported. Use finger:user instead.\n");
ret=KEYSERVER_NOT_SUPPORTED;
goto fail;
}
if(sscanf(line,"OPAQUE %1023s\n",path)==1)
{
path[1023]='\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 %255s\n",optionstr)==1)
{
int no=0;
char *start=&optionstr[0];
optionstr[255]='\0';
if(strncasecmp(optionstr,"no-",3)==0)
{
no=1;
start=&optionstr[3];
}
if(strcasecmp(start,"verbose")==0)
{
if(no)
verbose--;
else
verbose++;
}
else if(strncasecmp(start,"timeout",7)==0)
{
if(no)
timeout=0;
else
timeout=atoi(&start[8]);
}
continue;
}
}
if(timeout && register_timeout()==-1)
{
fprintf(console,"gpgkeys: unable to register timeout handler\n");
return KEYSERVER_INTERNAL_ERROR;
}
/* 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 || !*path)
{
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)
{
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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