2.11BSD/src/usr.sbin/named/named/ns_init.c
/*
* Copyright (c) 1986 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/
#ifndef lint
static char sccsid[] = "@(#)ns_init.c 4.23 (Berkeley) 2/28/88";
#endif /* not lint */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <stdio.h>
#include <errno.h>
#include <signal.h>
#include <syslog.h>
#include <ctype.h>
#include <arpa/nameser.h>
#include "ns.h"
#include "db.h"
struct zoneinfo zones[MAXZONES]; /* zone information */
int nzones; /* number of zones in use */
int forward_only = 0; /* run only as a slave */
char *cache_file;
char *localdomain; /* "default" for non-dotted names */
u_long maint_interval = 300; /* minimum ns_maint() interval */
extern int lineno;
/*
* Read boot file for configuration info.
*/
ns_init(bootfile)
char *bootfile;
{
register struct zoneinfo *zp;
char buf[BUFSIZ];
FILE *fp;
int type;
time_t next_refresh = 0;
struct itimerval ival;
extern int needmaint;
#ifdef DEBUG
if (debug >= 3)
fprintf(ddt,"ns_init(%s)\n", bootfile);
#endif
gettime(&tt);
if ((fp = fopen(bootfile, "r")) == NULL) {
syslog(LOG_ERR, "%s: %m", bootfile);
exit(1);
}
lineno = 0;
/* allocate cache hash table, formerly the root hash table. */
hashtab = savehash((struct hashbuf *)NULL);
/* allocate root-hints/file-cache hash table */
fcachetab = savehash((struct hashbuf *)NULL);
if (localdomain)
free(localdomain);
localdomain = NULL;
/* init zone data */
cache_file = NULL;
nzones = 1; /* zone zero is cache data */
zones[0].z_type = Z_CACHE;
while (!feof(fp) && !ferror(fp)) {
if (!getword(buf, sizeof(buf), fp))
continue;
/* read named.boot keyword and process args */
if (strcasecmp(buf, "cache") == 0) {
type = Z_CACHE;
zp = zones;
}
else if (strcasecmp(buf, "primary") == 0)
type = Z_PRIMARY;
else if (strcasecmp(buf, "secondary") == 0)
type = Z_SECONDARY;
else if (strcasecmp(buf, "directory") == 0) {
(void) getword(buf, sizeof(buf), fp);
if (chdir(buf) < 0) {
syslog(LOG_CRIT, "directory %s: %m\n",
buf);
exit(1);
}
continue;
}
else if (strcasecmp(buf, "sortlist") == 0) {
get_sort_list(fp);
continue;
}
else if (strcasecmp(buf, "forwarders") == 0) {
get_forwarders(fp);
continue;
}
else if (strcasecmp(buf, "slave") == 0) {
forward_only++;
endline(fp);
continue;
}
else if (strcasecmp(buf, "domain") == 0) {
if (getword(buf, sizeof(buf), fp))
localdomain = savestr(buf);
endline(fp);
continue;
} else {
syslog(LOG_ERR, "%s: line %d: unknown field '%s'\n",
bootfile, lineno, buf);
endline(fp);
continue;
}
if (nzones >= MAXZONES) {
syslog(LOG_ERR, "too many zones (MAXZONES=%d)\n",
MAXZONES);
endline(fp);
continue;
}
if (type != Z_CACHE)
zp = &zones[nzones++];
if (zp->z_origin) {
free(zp->z_origin);
zp->z_origin = 0;
}
if (zp->z_source) {
free(zp->z_source);
zp->z_source = 0;
}
zp->z_type = type;
zp->z_addrcnt = 0;
zp->z_auth = 0;
/*
* read zone origin
*/
if (!getword(buf, sizeof(buf), fp)) {
syslog(LOG_ERR, "%s: line %d: missing origin\n",
bootfile, lineno);
continue;
}
if (buf[0] == '.')
buf[0] = '\0';
zp->z_origin = savestr(buf);
/*
* read source file or host address
*/
if (!getword(buf, sizeof(buf), fp)) {
syslog(LOG_ERR, "%s: line %d: missing origin\n",
bootfile, lineno);
continue;
}
#ifdef DEBUG
if (debug)
fprintf(ddt,"zone[%d] type %d: '%s'",
zp-zones, zp->z_type,
*(zp->z_origin) == '\0' ? "." : zp->z_origin);
#endif
zp->z_time = 0;
zp->z_refresh = 0; /* by default, no dumping */
switch (type) {
case Z_CACHE:
zp->z_source = savestr(buf);
#ifdef DEBUG
if (debug)
fprintf(ddt,", source = %s\n", zp->z_source);
#endif
if (getword(buf, sizeof(buf), fp)) {
#ifdef notyet
zp->z_refresh = atoi(buf);
if (zp->z_refresh <= 0) {
syslog(LOG_ERR,
"%s: line %d: bad refresh '%s', ignored\n",
bootfile, lineno, buf);
zp->z_refresh = 0;
} else if (cache_file == NULL)
cache_file = zp->z_source;
#else
syslog(LOG_WARNING,
"%s: line %d: cache refresh ignored\n",
bootfile, lineno);
#endif
endline(fp);
}
(void) db_load(zp->z_source, zp->z_origin, zp);
break;
case Z_PRIMARY:
zp->z_source = savestr(buf);
#ifdef DEBUG
if (debug)
fprintf(ddt,", source = %s\n", zp->z_source);
#endif
if (db_load(zp->z_source, zp->z_origin, zp) == 0)
zp->z_auth = 1;
#ifdef ALLOW_UPDATES
/* Guarantee calls to ns_maint() */
zp->z_refresh = maint_interval;
#else
zp->z_refresh = 0;
zp->z_time = 0;
#endif ALLOW_UPDATES
break;
case Z_SECONDARY:
#ifdef DEBUG
if (debug)
fprintf(ddt,"\n\taddrs: %s, ", buf);
#endif
zp->z_addr[zp->z_addrcnt].s_addr =
inet_addr(buf);
/* Indicate no cache for this zone yet */
zp->z_source = (char *) NULL;
if (zp->z_addr[zp->z_addrcnt].s_addr != (unsigned)-1)
zp->z_addrcnt++;
while (getword(buf, sizeof(buf), fp)) {
zp->z_addr[zp->z_addrcnt].s_addr =
inet_addr(buf);
if (zp->z_addr[zp->z_addrcnt].s_addr ==
(unsigned)-1) {
zp->z_source = savestr(buf);
break;
}
#ifdef DEBUG
if (debug)
fprintf(ddt,"%s, ",buf);
#endif
if (++zp->z_addrcnt >= NSMAX) {
zp->z_addrcnt = NSMAX;
#ifdef DEBUG
if (debug)
fprintf(ddt,
"\nns.h NSMAX reached\n");
#endif
break;
}
}
#ifdef DEBUG
if (debug)
fprintf(ddt,"addrcnt = %d\n", zp->z_addrcnt);
#endif
zoneinit(zp);
break;
}
if (zp->z_refresh && zp->z_time == 0)
zp->z_time = zp->z_refresh + tt.tv_sec;
#ifdef DEBUG
if (debug)
fprintf(ddt, "z_time %ld, z_refresh %ld\n",
zp->z_time, zp->z_refresh);
#endif
if (zp->z_time != 0 &&
(next_refresh == 0 || next_refresh > zp->z_time))
next_refresh = zp->z_time;
}
(void) fclose(fp);
/*
* Schedule calls to ns_maint().
*/
bzero((char *)&ival, sizeof(ival));
if (next_refresh) {
gettime(&tt);
if (next_refresh <= tt.tv_sec)
needmaint = 1;
else {
ival.it_value.tv_sec = next_refresh - tt.tv_sec;
if (ival.it_value.tv_sec < maint_interval)
ival.it_value.tv_sec = maint_interval;
}
}
(void) setitimer(ITIMER_REAL, &ival, (struct itimerval *)NULL);
#ifdef DEBUG
if (debug) {
fprintf(ddt,"exit ns_init() ");
if (needmaint || ival.it_value.tv_sec)
fprintf(ddt,"Next interrupt in %ld sec\n",
ival.it_value.tv_sec);
else
fprintf(ddt,"No maintenance scheduled\n");
}
#endif
}
zoneinit(zp)
register struct zoneinfo *zp;
{
#ifdef DEBUG
if (debug)
fprintf(ddt,"zoneinit()\n");
#endif
/*
* Try to load zone from backup file,
* if one was specified and it exists.
* If not, or if the data are out of date,
* we will refresh the zone from a primary
* immediately.
*/
if (zp->z_source == NULL ||
db_load(zp->z_source, zp->z_origin, zp) != 0) {
/*
* Set zone to be refreshed immediately.
*/
zp->z_refresh = INIT_REFRESH;
zp->z_retry = INIT_REFRESH;
zp->z_time = tt.tv_sec;
} else
zp->z_auth = 1;
}
#ifdef ALLOW_UPDATES
/*
* Look for the authoritative zone with the longest matching RHS of dname
* and return its zone # or zero if not found.
*/
findzone(dname, class)
char *dname;
int class;
{
char *dZoneName, *zoneName, *index(), *dotPos;
int dZoneNameLen, zoneNameLen;
int maxMatchLen = 0;
int maxMatchZoneNum = 0;
int zoneNum;
#ifdef DEBUG
if (debug >= 4)
fprintf(ddt, "findzone(dname=%s, class=%d)\n", dname, class);
if (debug >= 5) {
fprintf(ddt, "zone dump:\n");
for (zoneNum = 1; zoneNum < nzones; zoneNum++)
printzoneinfo(zoneNum);
}
#endif DEBUG
dZoneName = index(dname, '.');
if (dZoneName == NULL)
dZoneName = ""; /* root */
else
dZoneName++; /* There is a '.' in dname, so use remainder of
string as the zone name */
dZoneNameLen = strlen(dZoneName);
for (zoneNum = 1; zoneNum < nzones; zoneNum++) {
zoneName = (zones[zoneNum]).z_origin;
zoneNameLen = strlen(zoneName);
/* The zone name may or may not end with a '.' */
dotPos = index(zoneName, '.');
if (dotPos)
zoneNameLen--;
if (dZoneNameLen != zoneNameLen)
continue;
#ifdef DEBUG
if (debug >= 5)
fprintf(ddt, "about to strncasecmp('%s', '%s', %d)\n",
dZoneName, zoneName, dZoneNameLen);
#endif
if (strncasecmp(dZoneName, zoneName, dZoneNameLen) == 0) {
#ifdef DEBUG
if (debug >= 5)
fprintf(ddt, "match\n");
#endif
/*
* See if this is as long a match as any so far.
* Check if "<=" instead of just "<" so that if
* root domain (whose name length is 0) matches,
* we use it's zone number instead of just 0
*/
if (maxMatchLen <= zoneNameLen) {
maxMatchZoneNum = zoneNum;
maxMatchLen = zoneNameLen;
}
}
#ifdef DEBUG
else
if (debug >= 5)
fprintf(ddt, "no match\n");
#endif
}
#ifdef DEBUG
if (debug >= 4)
fprintf(ddt, "findzone: returning %d\n", maxMatchZoneNum);
#endif DEBUG
return (maxMatchZoneNum);
}
#endif ALLOW_UPDATES
soa_zinfo(zp, cp, eom)
register struct zoneinfo *zp;
register u_char *cp;
u_char *eom;
{
cp += 3 * sizeof(u_short);
cp += sizeof(u_long);
cp += dn_skipname(cp, eom);
cp += dn_skipname(cp, eom);
GETLONG(zp->z_serial, cp);
GETLONG(zp->z_refresh, cp);
gettime(&tt);
zp->z_time = tt.tv_sec + zp->z_refresh;
GETLONG(zp->z_retry, cp);
GETLONG(zp->z_expire, cp);
GETLONG(zp->z_minimum, cp);
}
get_forwarders(fp)
FILE *fp;
{
char buf[BUFSIZ];
struct fwdinfo *fip = NULL, *ftp = NULL;
extern struct sockaddr_in nsaddr;
extern struct fwdinfo *fwdtab;
#ifdef DEBUG
if (debug)
fprintf(ddt,"forwarders ");
#endif
while (getword(buf, sizeof(buf), fp)) {
if (strlen(buf) == 0)
break;
#ifdef DEBUG
if (debug)
fprintf(ddt," %s",buf);
#endif
if (ftp == NULL)
ftp = (struct fwdinfo *)malloc(sizeof(struct fwdinfo));
if ( isdigit(buf[0]) &&
(ftp->fwdaddr.sin_addr.s_addr = inet_addr(buf))
!= (unsigned)-1) {
ftp->fwdaddr.sin_port = nsaddr.sin_port;
ftp->fwdaddr.sin_family = AF_INET;
} else {
syslog(LOG_ERR, "'%s' (ignored, NOT dotted quad)", buf);
#ifdef DEBUG
if (debug)
fprintf(ddt," (ignored, NOT dotted quad)");
#endif
continue;
}
ftp->next = NULL;
if (fwdtab == NULL)
fwdtab = ftp; /* First time only */
else
fip->next = ftp;
fip = ftp;
ftp = NULL;
}
if (ftp)
free((char *)ftp);
#ifdef DEBUG
if (debug)
fprintf(ddt,"\n");
if (debug > 2)
for (ftp = fwdtab; ftp != NULL; ftp = ftp->next)
fprintf(ddt,"ftp x%x %s next x%x\n", ftp,
inet_ntoa(ftp->fwdaddr.sin_addr), ftp->next);
#endif
}