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310 lines
7.4 KiB
C
310 lines
7.4 KiB
C
/* gpd.c - The GnuPG daemon (keyserver)
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* Copyright (C) 1998, 1999 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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/****************
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* This is a spinning server for most purposes, the server does only
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* fork for updates (which may require signature checks and lengthy DB
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* operations).
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*
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* see ks-proto.c for the used protocol.
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* see ks-db.c for the layout of the database.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "util.h"
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#include "cipher.h"
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#include "options.h"
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#include "main.h"
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static ARGPARSE_OPTS opts[] = {
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{ 'v', "verbose", 0, "verbose" },
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{ 501, "options" ,2, "read options from file"},
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{ 502, "no-daemon", 0, "do not operate as a daemon" },
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{ 510, "debug" ,4|16, "set debugging flags"},
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{ 511, "debug-all" ,0, "enable full debugging"},
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{0} };
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static char *build_list( const char *text,
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const char * (*mapf)(int), int (*chkf)(int) );
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static void become_daemon(void);
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const char *
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strusage( int level )
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{
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static char *digests, *pubkeys, *ciphers;
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const char *p;
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switch( level ) {
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case 11: p = "gpgd (GNUPG)"; break;
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case 13: p = VERSION; break;
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case 17: p = PRINTABLE_OS_NAME; break;
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case 19: p =
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"Please report bugs to <gnupg-bugs@gnu.org>.\n";
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break;
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case 1:
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case 40: p = "Usage: gpgd [options] (-h for help)";
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break;
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case 41: p = "Syntax: gpgd [options] [files]\n"
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"GNUPG keyserver\n";
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break;
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case 31: p = "\n"; break;
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case 32:
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if( !ciphers )
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ciphers = build_list("Supported ciphers: ", cipher_algo_to_string,
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check_cipher_algo );
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p = ciphers;
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break;
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case 33:
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if( !pubkeys )
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pubkeys = build_list("Supported pubkeys: ", pubkey_algo_to_string,
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check_pubkey_algo );
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p = pubkeys;
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break;
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case 34:
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if( !digests )
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digests = build_list("Supported digests: ", digest_algo_to_string,
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check_digest_algo );
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p = digests;
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break;
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default: p = default_strusage(level);
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}
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return p;
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}
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static char *
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build_list( const char *text, const char * (*mapf)(int), int (*chkf)(int) )
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{
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int i;
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const char *s;
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size_t n=strlen(text)+2;
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char *list, *p;
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for(i=1; i < 100; i++ )
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if( !chkf(i) && (s=mapf(i)) )
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n += strlen(s) + 2;
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list = m_alloc( 21 + n ); *list = 0;
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for(p=NULL, i=1; i < 100; i++ ) {
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if( !chkf(i) && (s=mapf(i)) ) {
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if( !p )
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p = stpcpy( list, text );
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else
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p = stpcpy( p, ", ");
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p = stpcpy(p, s );
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}
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}
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if( p )
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p = stpcpy(p, "\n" );
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return list;
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}
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static void
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set_debug(void)
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{
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if( opt.debug & DBG_MEMORY_VALUE )
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memory_debug_mode = 1;
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if( opt.debug & DBG_MEMSTAT_VALUE )
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memory_stat_debug_mode = 1;
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if( opt.debug & DBG_MPI_VALUE )
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mpi_debug_mode = 1;
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if( opt.debug & DBG_CIPHER_VALUE )
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g10c_debug_mode = 1;
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if( opt.debug & DBG_IOBUF_VALUE )
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iobuf_debug_mode = 1;
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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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ARGPARSE_ARGS pargs;
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int orig_argc;
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char **orig_argv;
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FILE *configfp = NULL;
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char *configname = NULL;
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unsigned configlineno;
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int parse_debug = 0;
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int default_config =1;
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int daemon = 1;
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secmem_init( 0 ); /* disable use of secmem */
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log_set_name("gpgd");
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log_set_pid( getpid() );
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opt.compress = -1; /* defaults to standard compress level */
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opt.batch = 1;
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/* check whether we have a config file on the commandline */
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orig_argc = argc;
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orig_argv = argv;
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pargs.argc = &argc;
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pargs.argv = &argv;
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pargs.flags= 1; /* do not remove the args */
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while( arg_parse( &pargs, opts) ) {
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if( pargs.r_opt == 510 || pargs.r_opt == 511 )
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parse_debug++;
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else if( pargs.r_opt == 501 ) {
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/* yes there is one, so we do not try the default one, but
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* read the option file when it is encountered at the commandline
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*/
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default_config = 0;
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}
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}
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if( default_config )
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configname = make_filename("/etc/gpgd.conf", NULL );
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argc = orig_argc;
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argv = orig_argv;
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pargs.argc = &argc;
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pargs.argv = &argv;
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pargs.flags= 1; /* do not remove the args */
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next_pass:
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if( configname ) {
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configlineno = 0;
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configfp = fopen( configname, "r" );
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if( !configfp ) {
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if( default_config ) {
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if( parse_debug )
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log_info("note: no default option file `%s'\n",
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configname );
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}
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else {
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log_error("option file `%s': %s\n",
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configname, strerror(errno) );
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g10_exit(1);
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}
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m_free(configname); configname = NULL;
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}
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if( parse_debug && configname )
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log_info("reading options from `%s'\n", configname );
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default_config = 0;
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}
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while( optfile_parse( configfp, configname, &configlineno,
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&pargs, opts) ) {
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switch( pargs.r_opt ) {
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case 'v': opt.verbose++; break;
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case 501:
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if( !configfp ) {
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m_free(configname);
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configname = m_strdup(pargs.r.ret_str);
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goto next_pass;
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}
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break;
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case 502: daemon = 0; break;
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case 510: opt.debug |= pargs.r.ret_ulong; break;
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case 511: opt.debug = ~0; break;
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default : pargs.err = configfp? 1:2; break;
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}
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}
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if( configfp ) {
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fclose( configfp );
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configfp = NULL;
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m_free(configname); configname = NULL;
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goto next_pass;
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}
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m_free( configname ); configname = NULL;
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if( log_get_errorcount(0) )
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g10_exit(2);
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fprintf(stderr, "%s %s; %s\n", strusage(11), strusage(13), strusage(14) );
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fprintf(stderr, "%s\n", strusage(15) );
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set_debug();
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if( daemon )
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become_daemon();
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g10_exit(0);
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return 8; /*NEVER REACHED*/
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}
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void
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g10_exit( int rc )
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{
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secmem_term();
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rc = rc? rc : log_get_errorcount(0)? 2:0;
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exit(rc );
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}
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static void
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become_daemon()
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{
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long nfile;
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int i, n;
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int childpid;
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if( opt.verbose )
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log_info("becoming a daemon ...\n");
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fflush(NULL);
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/* FIXME: handle the TTY signals */
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if( (childpid = fork()) == -1 )
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log_fatal("can't fork first child: %s\n", strerror(errno));
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else if( childpid > 0 )
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exit(0); /* terminate parent */
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/* Disassociate from controlling terminal etc. */
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if( setsid() == -1 )
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log_fatal("setsid() failed: %s\n", strerror(errno) );
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log_set_pid( getpid() );
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/* close all files but not the log files */
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if( (nfile=sysconf( _SC_OPEN_MAX )) < 0 )
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#ifdef _POSIX_OPEN_MAX
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nfile = _POSIX_OPEN_MAX;
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#else
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nfile = 20; /* assume a common value */
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#endif
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n = fileno( stderr );
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for(i=0; i < nfile; i++ )
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if( i != n )
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close(i);
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errno = 0;
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if( chdir("/") )
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log_fatal("chdir to root failed: %s\n", strerror(errno) );
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umask(0);
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/* do not let possible children become zombies */
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signal(SIGCHLD, SIG_IGN);
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if( opt.verbose )
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log_info("now running as daemon\n");
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}
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