main.c

bind 9.3结合mysql数据库

/*
 * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1999-2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: main.c,v 1.119.2.3.2.16 2004/09/01 07:16:35 marka Exp $ */

#include <config.h>

#include <ctype.h>
#include <stdlib.h>
#include <string.h>

#include <isc/app.h>
#include <isc/commandline.h>
#include <isc/dir.h>
#include <isc/entropy.h>
#include <isc/file.h>
#include <isc/hash.h>
#include <isc/os.h>
#include <isc/platform.h>
#include <isc/resource.h>
#include <isc/stdio.h>
#include <isc/string.h>
#include <isc/task.h>
#include <isc/timer.h>
#include <isc/util.h>

#include <isccc/result.h>

#include <dns/dispatch.h>
#include <dns/name.h>
#include <dns/result.h>
#include <dns/view.h>

#include <dst/result.h>

#ifdef HAVE_LIBSCF
#include <libscf.h>
#endif

/*
 * Defining NS_MAIN provides storage declarations (rather than extern)
 * for variables in named/globals.h.
 */
#define NS_MAIN 1

#include <named/builtin.h>
#include <named/control.h>
#include <named/globals.h>	/* Explicit, though named/log.h includes it. */
#include <named/interfacemgr.h>
#include <named/log.h>
#include <named/os.h>
#include <named/server.h>
#include <named/lwresd.h>
#include <named/main.h>

/*
 * Include header files for database drivers here.
 */
/* #include "xxdb.h" */
#include "mysqldb.h"

static isc_boolean_t	want_stats = ISC_FALSE;
static char		program_name[ISC_DIR_NAMEMAX] = "named";
static char		absolute_conffile[ISC_DIR_PATHMAX];
static char		saved_command_line[512];
static char		version[512];

void
ns_main_earlywarning(const char *format, ...) {
	va_list args;

	va_start(args, format);
	if (ns_g_lctx != NULL) {
		isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
			       NS_LOGMODULE_MAIN, ISC_LOG_WARNING,
			       format, args);
	} else {
		fprintf(stderr, "%s: ", program_name);
		vfprintf(stderr, format, args);
		fprintf(stderr, "\n");
		fflush(stderr);
	}
	va_end(args);
}

void
ns_main_earlyfatal(const char *format, ...) {
	va_list args;

	va_start(args, format);
	if (ns_g_lctx != NULL) {
		isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
			       NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
			       format, args);
		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
			       NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
			       "exiting (due to early fatal error)");
	} else {
		fprintf(stderr, "%s: ", program_name);
		vfprintf(stderr, format, args);
		fprintf(stderr, "\n");
		fflush(stderr);
	}
	va_end(args);

	exit(1);
}

static void
assertion_failed(const char *file, int line, isc_assertiontype_t type,
		 const char *cond)
{
	/*
	 * Handle assertion failures.
	 */

	if (ns_g_lctx != NULL) {
		/*
		 * Reset the assetion callback in case it is the log
		 * routines causing the assertion.
		 */
		isc_assertion_setcallback(NULL);

		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
			      NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
			      "%s:%d: %s(%s) failed", file, line,
			      isc_assertion_typetotext(type), cond);
		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
			      NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
			      "exiting (due to assertion failure)");
	} else {
		fprintf(stderr, "%s:%d: %s(%s) failed\n",
			file, line, isc_assertion_typetotext(type), cond);
		fflush(stderr);
	}

	if (ns_g_coreok)
		abort();
	exit(1);
}

static void
library_fatal_error(const char *file, int line, const char *format,
		    va_list args) ISC_FORMAT_PRINTF(3, 0);

static void
library_fatal_error(const char *file, int line, const char *format,
		    va_list args)
{
	/*
	 * Handle isc_error_fatal() calls from our libraries.
	 */

	if (ns_g_lctx != NULL) {
		/*
		 * Reset the error callback in case it is the log
		 * routines causing the assertion.
		 */
		isc_error_setfatal(NULL);

		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
			      NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
			      "%s:%d: fatal error:", file, line);
		isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
			       NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
			       format, args);
		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
			      NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
			      "exiting (due to fatal error in library)");
	} else {
		fprintf(stderr, "%s:%d: fatal error: ", file, line);
		vfprintf(stderr, format, args);
		fprintf(stderr, "\n");
		fflush(stderr);
	}

	if (ns_g_coreok)
		abort();
	exit(1);
}

static void
library_unexpected_error(const char *file, int line, const char *format,
			 va_list args) ISC_FORMAT_PRINTF(3, 0);

static void
library_unexpected_error(const char *file, int line, const char *format,
			 va_list args)
{
	/*
	 * Handle isc_error_unexpected() calls from our libraries.
	 */

	if (ns_g_lctx != NULL) {
		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
			      NS_LOGMODULE_MAIN, ISC_LOG_ERROR,
			      "%s:%d: unexpected error:", file, line);
		isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
			       NS_LOGMODULE_MAIN, ISC_LOG_ERROR,
			       format, args);
	} else {
		fprintf(stderr, "%s:%d: fatal error: ", file, line);
		vfprintf(stderr, format, args);
		fprintf(stderr, "\n");
		fflush(stderr);
	}
}

static void
lwresd_usage(void) {
	fprintf(stderr,
		"usage: lwresd [-4|-6] [-c conffile | -C resolvconffile] "
		"[-d debuglevel]\n"
		"              [-f|-g] [-n number_of_cpus] [-p port] "
		"[-P listen-port] [-s]\n"
		"              [-t chrootdir] [-u username] [-i pidfile]\n"
		"              [-m {usage|trace|record}]\n");
}

static void
usage(void) {
	if (ns_g_lwresdonly) {
		lwresd_usage();
		return;
	}
	fprintf(stderr,
		"usage: named [-4|-6] [-c conffile] [-d debuglevel] "
		"[-f|-g] [-n number_of_cpus]\n"
		"             [-p port] [-s] [-t chrootdir] [-u username]\n"
		"             [-m {usage|trace|record}]\n");
}

static void
save_command_line(int argc, char *argv[]) {
	int i;
	char *src;
	char *dst;
	char *eob;
	const char truncated[] = "...";
	isc_boolean_t quoted = ISC_FALSE;

	dst = saved_command_line;
	eob = saved_command_line + sizeof(saved_command_line);

	for (i = 1; i < argc && dst < eob; i++) {
		*dst++ = ' ';

		src = argv[i];
		while (*src != '\0' && dst < eob) {
			/*
			 * This won't perfectly produce a shell-independent
			 * pastable command line in all circumstances, but
			 * comes close, and for practical purposes will
			 * nearly always be fine.
			 */
			if (quoted || isalnum(*src & 0xff) ||
			    *src == '-' || *src == '_' ||
			    *src == '.' || *src == '/') {
				*dst++ = *src++;
				quoted = ISC_FALSE;
			} else {
				*dst++ = '\\';
				quoted = ISC_TRUE;
			}
		}
	}

	INSIST(sizeof(saved_command_line) >= sizeof(truncated));

	if (dst == eob)
		strcpy(eob - sizeof(truncated), truncated);
	else
		*dst = '\0';
}

static int
parse_int(char *arg, const char *desc) {
	char *endp;
	int tmp;
	long int ltmp;

	ltmp = strtol(arg, &endp, 10);
	tmp = (int) ltmp;
	if (*endp != '\0')
		ns_main_earlyfatal("%s '%s' must be numeric", desc, arg);
	if (tmp < 0 || tmp != ltmp)
		ns_main_earlyfatal("%s '%s' out of range", desc, arg);
	return (tmp);
}

static struct flag_def {
	const char *name;
	unsigned int value;
} mem_debug_flags[] = {
	{ "trace",  ISC_MEM_DEBUGTRACE },
	{ "record", ISC_MEM_DEBUGRECORD },
	{ "usage", ISC_MEM_DEBUGUSAGE },
	{ NULL, 0 }
};

static void
set_flags(const char *arg, struct flag_def *defs, unsigned int *ret) {
	for (;;) {
		const struct flag_def *def;
		const char *end = strchr(arg, ',');
		int arglen;
		if (end == NULL)
			end = arg + strlen(arg);
		arglen = end - arg;
		for (def = defs; def->name != NULL; def++) {
			if (arglen == (int)strlen(def->name) &&
			    memcmp(arg, def->name, arglen) == 0) {
				*ret |= def->value;
				goto found;
			}
		}
		ns_main_earlyfatal("unrecognized flag '%.*s'", arglen, arg);
	 found:
		if (*end == '\0')
			break;
		arg = end + 1;
	}
}

static void
parse_command_line(int argc, char *argv[]) {
	int ch;
	int port;
	isc_boolean_t disable6 = ISC_FALSE;
	isc_boolean_t disable4 = ISC_FALSE;

	save_command_line(argc, argv);

	isc_commandline_errprint = ISC_FALSE;
	while ((ch = isc_commandline_parse(argc, argv,
			           "46c:C:d:fgi:lm:n:N:p:P:st:u:vx:")) != -1) {
		switch (ch) {
		case '4':
			if (disable4)
				ns_main_earlyfatal("cannot specify -4 and -6");
			if (isc_net_probeipv4() != ISC_R_SUCCESS)
				ns_main_earlyfatal("IPv4 not supported by OS");
			isc_net_disableipv6();
			disable6 = ISC_TRUE;
			break;
		case '6':
			if (disable6)
				ns_main_earlyfatal("cannot specify -4 and -6");
			if (isc_net_probeipv6() != ISC_R_SUCCESS)
				ns_main_earlyfatal("IPv6 not supported by OS");
			isc_net_disableipv4();
			disable4 = ISC_TRUE;
			break;
		case 'c':
			ns_g_conffile = isc_commandline_argument;
			lwresd_g_conffile = isc_commandline_argument;
			if (lwresd_g_useresolvconf)
				ns_main_earlyfatal("cannot specify -c and -C");
			ns_g_conffileset = ISC_TRUE;
			break;
		case 'C':
			lwresd_g_resolvconffile = isc_commandline_argument;
			if (ns_g_conffileset)
				ns_main_earlyfatal("cannot specify -c and -C");
			lwresd_g_useresolvconf = ISC_TRUE;
			break;
		case 'd':
			ns_g_debuglevel = parse_int(isc_commandline_argument,
						    "debug level");
			break;
		case 'f':
			ns_g_foreground = ISC_TRUE;
			break;
		case 'g':
			ns_g_foreground = ISC_TRUE;
			ns_g_logstderr = ISC_TRUE;
			break;
		/* XXXBEW -i should be removed */
		case 'i':
			lwresd_g_defaultpidfile = isc_commandline_argument;
			break;
		case 'l':
			ns_g_lwresdonly = ISC_TRUE;
			break;
		case 'm':
			set_flags(isc_commandline_argument, mem_debug_flags,
				  &isc_mem_debugging);
			break;
		case 'N': /* Deprecated. */
		case 'n':
			ns_g_cpus = parse_int(isc_commandline_argument,
					      "number of cpus");
			if (ns_g_cpus == 0)
				ns_g_cpus = 1;
			break;
		case 'p':
			port = parse_int(isc_commandline_argument, "port");
			if (port < 1 || port > 65535)
				ns_main_earlyfatal("port '%s' out of range",
						   isc_commandline_argument);
			ns_g_port = port;
			break;
		/* XXXBEW Should -P be removed? */
		case 'P':
			port = parse_int(isc_commandline_argument, "port");
			if (port < 1 || port > 65535)
				ns_main_earlyfatal("port '%s' out of range",
						   isc_commandline_argument);
			lwresd_g_listenport = port;
			break;
		case 's':
			/* XXXRTH temporary syntax */
			want_stats = ISC_TRUE;
			break;
		case 't':
			/* XXXJAB should we make a copy? */
			ns_g_chrootdir = isc_commandline_argument;
			break;
		case 'u':
			ns_g_username = isc_commandline_argument;
			break;
		case 'v':
			printf("BIND %s\n", ns_g_version);
			exit(0);
		case '?':
			usage();
			ns_main_earlyfatal("unknown option '-%c'",
					   isc_commandline_option);
		default:
			ns_main_earlyfatal("parsing options returned %d", ch);