mirror of
git://git.gnupg.org/gnupg.git
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536 lines
11 KiB
C
536 lines
11 KiB
C
/* gpgkeys_finger.c - fetch a key via finger
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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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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.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 "keyserver.h"
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#include "ksutil.h"
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#include "iobuf.h"
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#ifdef _WIN32
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#define sock_close(a) closesocket(a)
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#else
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#define sock_close(a) close(a)
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#endif
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extern char *optarg;
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extern int optind;
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static FILE *input,*output,*console;
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static struct ks_options *opt;
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#ifdef _WIN32
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static void
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deinit_sockets (void)
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{
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WSACleanup();
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}
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static void
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init_sockets (void)
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{
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static int initialized;
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static WSADATA wsdata;
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if (initialized)
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return;
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if (WSAStartup (0x0101, &wsdata) )
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{
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fprintf (console, "error initializing socket library: ec=%d\n",
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(int)WSAGetLastError () );
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return;
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}
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if (wsdata.wVersion < 0x0001)
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{
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fprintf (console, "socket library version is %x.%x - but 1.1 needed\n",
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LOBYTE(wsdata.wVersion), HIBYTE(wsdata.wVersion));
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WSACleanup();
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return;
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}
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atexit (deinit_sockets);
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initialized = 1;
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}
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#endif /*_WIN32*/
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/* Connect to SERVER at PORT and return a file descriptor or -1 on
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error. */
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static int
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connect_server (const char *server, unsigned short port)
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{
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int sock = -1;
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#ifdef _WIN32
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struct hostent *hp;
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struct sockaddr_in addr;
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unsigned long l;
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init_sockets ();
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memset (&addr, 0, sizeof addr);
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addr.sin_family = AF_INET;
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addr.sin_port = htons (port);
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/* Win32 gethostbyname doesn't handle IP addresses internally, so we
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try inet_addr first on that platform only. */
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if ((l = inet_addr (server)) != INADDR_NONE)
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memcpy (&addr.sin_addr, &l, sizeof l);
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else if ((hp = gethostbyname (server)))
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{
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if (hp->h_addrtype != AF_INET)
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{
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fprintf (console, "gpgkeys: unknown address family for `%s'\n",
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server);
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return -1;
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}
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if (hp->h_length != 4)
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{
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fprintf (console, "gpgkeys: illegal address length for `%s'\n",
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server);
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return -1;
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}
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memcpy (&addr.sin_addr, hp->h_addr, hp->h_length);
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}
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else
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{
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fprintf (console, "gpgkeys: host `%s' not found: ec=%d\n",
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server, (int)WSAGetLastError ());
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return -1;
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}
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sock = socket (AF_INET, SOCK_STREAM, 0);
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if (sock == INVALID_SOCKET)
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{
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fprintf (console, "gpgkeys: error creating socket: ec=%d\n",
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(int)WSAGetLastError ());
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return -1;
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}
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if (connect (sock, (struct sockaddr *)&addr, sizeof addr))
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{
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fprintf (console, "gpgkeys: error connecting `%s': ec=%d\n",
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server, (int)WSAGetLastError ());
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sock_close (sock);
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return -1;
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}
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#else
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struct sockaddr_in addr;
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struct hostent *host;
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addr.sin_family = AF_INET;
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addr.sin_port = htons (port);
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host = gethostbyname ((char*)server);
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if (!host)
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{
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fprintf (console, "gpgkeys: host `%s' not found: %s\n",
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server, strerror (errno));
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return -1;
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}
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addr.sin_addr = *(struct in_addr*)host->h_addr;
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sock = socket (AF_INET, SOCK_STREAM, 0);
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if (sock == -1)
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{
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fprintf (console, "gpgkeys: error creating socket: %s\n",
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strerror (errno));
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return -1;
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}
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if (connect (sock, (struct sockaddr *)&addr, sizeof addr) == -1)
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{
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fprintf (console, "gpgkeys: error connecting `%s': %s\n",
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server, strerror (errno));
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close (sock);
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return -1;
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}
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#endif
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return sock;
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}
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static int
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write_server (int sock, const char *data, size_t length)
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{
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int nleft;
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nleft = length;
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while (nleft > 0)
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{
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int nwritten;
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#ifdef _WIN32
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nwritten = send (sock, data, nleft, 0);
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if ( nwritten == SOCKET_ERROR )
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{
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fprintf (console, "gpgkeys: write failed: ec=%d\n",
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(int)WSAGetLastError ());
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return -1;
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}
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#else
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nwritten = write (sock, data, nleft);
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if (nwritten == -1)
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{
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if (errno == EINTR)
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continue;
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if (errno == EAGAIN)
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{
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struct timeval tv;
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tv.tv_sec = 0;
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tv.tv_usec = 50000;
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select(0, NULL, NULL, NULL, &tv);
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continue;
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}
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fprintf (console, "gpgkeys: write failed: %s\n", strerror(errno));
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return -1;
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}
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#endif
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nleft -=nwritten;
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data += nwritten;
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}
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return 0;
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}
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/* Send the finger REQUEST to the server. Returns 0 and a file descriptor
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in R_SOCK if the request was sucessful. */
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static int
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send_request (const char *request, int *r_sock)
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{
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char *server;
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char *name;
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int sock;
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*r_sock = -1;
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name = strdup (request);
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if (!name)
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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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server = strchr (name, '@');
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if (!server)
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{
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fprintf (console, "gpgkeys: no name included in request\n");
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free (name);
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return KEYSERVER_GENERAL_ERROR;
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}
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*server++ = 0;
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sock = connect_server (server, 79);
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if (sock == -1)
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{
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free (name);
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return KEYSERVER_UNREACHABLE;
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}
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if (write_server (sock, name, strlen (name))
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|| write_server (sock, "\r\n", 2))
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{
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free (name);
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sock_close (sock);
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return KEYSERVER_GENERAL_ERROR;
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}
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free (name);
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*r_sock = sock;
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return 0;
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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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int rc;
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int sock;
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iobuf_t fp_read;
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unsigned int maxlen, buflen, gotit=0;
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byte *line = NULL;
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if (strncmp (getkey,"0x",2)==0)
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getkey+=2;
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/* Frankly we don't know what keys the server will return; we
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indicated the requested key anyway. */
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fprintf(output,"KEY 0x%s BEGIN\n",getkey);
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rc=send_request(opt->opaque,&sock);
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if(rc)
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{
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fprintf(output,"KEY 0x%s FAILED %d\n",getkey, rc);
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sock_close (sock);
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return KEYSERVER_OK;
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}
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/* Hmmm, we use iobuf here only to cope with Windows socket
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peculiarities (we can't used fdopen). */
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fp_read = iobuf_sockopen (sock , "r");
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if (!fp_read)
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{
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fprintf(output,"KEY 0x%s FAILED %d\n",getkey, KEYSERVER_INTERNAL_ERROR);
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sock_close (sock);
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return KEYSERVER_OK;
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}
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while ( iobuf_read_line ( 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, (const char*)line);
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if (!strncmp((char*)line,END,strlen(END)))
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break;
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}
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else if(!strncmp((char*)line,BEGIN,strlen(BEGIN)))
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{
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print_nocr(output, (const char*)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: no key data found for finger:%s\n",
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opt->opaque);
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fprintf(output,"KEY 0x%s FAILED %d\n",getkey,KEYSERVER_KEY_NOT_FOUND);
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}
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xfree(line);
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iobuf_close (fp_read);
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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,ret=KEYSERVER_INTERNAL_ERROR;
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char line[MAX_LINE];
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char *thekey=NULL;
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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_finger (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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opt=init_ks_options();
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if(!opt)
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return KEYSERVER_NO_MEMORY;
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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 err;
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if(line[0]=='\n')
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break;
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err=parse_ks_options(line,opt);
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if(err>0)
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{
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ret=err;
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goto fail;
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}
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else if(err==0)
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continue;
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}
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if(opt->host)
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{
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fprintf(console,"gpgkeys: finger://relay/user syntax is not"
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" supported. Use finger:user instead.\n");
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ret=KEYSERVER_NOT_SUPPORTED;
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goto fail;
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}
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if(opt->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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/* 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(opt->action==KS_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 || !opt->opaque)
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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(opt->verbose>1)
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{
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fprintf(console,"User:\t\t%s\n",opt->opaque);
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fprintf(console,"Command:\tGET\n");
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}
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set_timeout(opt->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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free_ks_options(opt);
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return ret;
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}
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