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125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/*
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* daemon/unbound.c - main program for unbound DNS resolver daemon.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/**
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* \file
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*
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* Main program to start the DNS resolver daemon.
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*/
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#include "config.h"
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#include "util/log.h"
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#include "daemon/worker.h"
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/** default port to listen for queries, passed to getaddrinfo */
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#define UNBOUND_DNS_PORT "53"
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/** buffer size for network connections */
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#define BUFSZ 65552
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/** print usage. */
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static void usage()
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{
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printf("usage: unbound [options]\n");
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printf("\tstart unbound daemon DNS resolver.\n");
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printf("-h this help\n");
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printf("-p port the port to listen on\n");
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printf("-v verbose (multiple times increase verbosity)\n");
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printf("Version %s\n", PACKAGE_VERSION);
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printf("BSD licensed, see LICENSE file in source package.\n");
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printf("Report bugs to %s.\n", PACKAGE_BUGREPORT);
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}
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/** getopt global, in case header files fail to declare it. */
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extern int optind;
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/** getopt global, in case header files fail to declare it. */
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extern char* optarg;
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/**
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* main program. Set options given commandline arguments.
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* @param argc: number of commandline arguments.
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* @param argv: array of commandline arguments.
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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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struct worker* worker = NULL;
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int do_ip4=1, do_ip6=1, do_udp=1, do_tcp=1;
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const char* port = UNBOUND_DNS_PORT;
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int c;
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log_init();
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/* parse the options */
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while( (c=getopt(argc, argv, "hvp:")) != -1) {
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switch(c) {
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case 'p':
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if(!atoi(optarg))
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fatal_exit("invalid port '%s'", optarg);
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port = optarg;
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verbose(VERB_ALGO, "using port: %s", port);
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break;
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case 'v':
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verbosity ++;
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break;
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case '?':
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case 'h':
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default:
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usage();
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return 1;
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}
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}
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argc -= optind;
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argv += optind;
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if(argc != 0) {
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usage();
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return 1;
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}
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/* setup */
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worker = worker_init(port, do_ip4, do_ip6, do_udp, do_tcp, BUFSZ);
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if(!worker) {
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fatal_exit("could not initialize");
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}
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/* drop user priviliges and chroot if needed */
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log_info("Start of %s.", PACKAGE_STRING);
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worker_work(worker);
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/* cleanup */
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verbose(VERB_ALGO, "Exit cleanup.");
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worker_delete(worker);
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return 0;
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}
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