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/*
* The original version of xfer by Kevin Dunlap.
* Completed and integrated with named by David Waitzman
* (dwaitzman@bbn.com) 3/14/88.
* Modified by M. Karels and O. Kure 10-88.
* Modified extensively since then by just about everybody.
*/
/*
* ++Copyright++ 1988, 1990
* -
* Copyright (c) 1988, 1990
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* -
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* 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, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION 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.
* -
* --Copyright--
*/
#if !defined(lint) && !defined(SABER)
char copyright[] =
"@(#) Copyright (c) 1988, 1990 The Regents of the University of California.\n\
portions Copyright (c) 1993 Digital Equipment Corporation\n\
All rights reserved.\n";
#endif /* not lint */
#if !defined(lint) && !defined(SABER)
static char sccsid[] = "@(#)named-xfer.c 4.18 (Berkeley) 3/7/91";
static char rcsid[] = "$Id: named-xfer.c,v 8.10 1995/12/06 20:34:38 vixie Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#if defined(__osf__)
# include <sys/mbuf.h>
# include <net/route.h>
#endif
#if defined(_AIX)
# include <sys/time.h>
# define TIME_H_INCLUDED
#endif
#include <net/if.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <errno.h>
#include <resolv.h>
#include <stdio.h>
#include <syslog.h>
#if !defined(SVR4) || !defined(sun)
# include <math.h>
#endif
#include <ctype.h>
#include <signal.h>
#define MAIN_PROGRAM
#include "named.h"
#undef MAIN_PROGRAM
#ifndef LOG_PERROR
# define LOG_PERROR 0
#endif
static struct zoneinfo zone; /* zone information */
static char ddtfilename[] = _PATH_TMPXFER,
*ddtfile = ddtfilename,
*tmpname,
*domain; /* domain being xfered */
static int quiet = 0,
read_interrupted = 0,
curclass,
domain_len; /* strlen(domain) */
static FILE *fp = NULL,
*dbfp = NULL;
static char *ProgName;
static void usage __P((const char *));
static int getzone __P((struct zoneinfo *, u_int32_t, int)),
print_output __P((u_char *, int, u_char *)),
netread __P((int, char *, int, int));
static SIG_FN read_alarm __P(());
static const char *soa_zinfo __P((struct zoneinfo *, u_char *, u_char*));
extern char *optarg;
extern int optind, getopt();
void
main(argc, argv)
int argc;
char *argv[];
{
register struct zoneinfo *zp;
register struct hostent *hp;
char *dbfile = NULL, *tracefile = NULL, *tm = NULL;
int dbfd, ddtd, result, c, fd, closed = 0;
u_int32_t serial_no = 0;
u_int16_t port = htons(NAMESERVER_PORT);
struct stat statbuf;
#ifdef STUBS
int stub_only = 0;
#endif
#ifdef GEN_AXFR
int class = C_IN;
#endif
if (ProgName = strrchr(argv[0], '/'))
ProgName++;
else
ProgName = argv[0];
(void) umask(022);
/* this is a hack; closing everything in the parent is hard. */
for (fd = getdtablesize()-1; fd > STDERR_FILENO; fd--)
closed += (close(fd) == 0);
#ifdef RENICE
nice(-40); /* this is the recommended procedure to */
nice(20); /* reset the priority of the current process */
nice(0); /* to "normal" (== 0) - see nice(3) */
#endif
#ifdef LOG_DAEMON
openlog(ProgName, LOG_PID|LOG_CONS|LOG_PERROR, LOGFAC);
#else
openlog(ProgName, LOG_PID);
#endif
#ifdef STUBS
while ((c = getopt(argc, argv, "C:d:l:s:t:z:f:p:P:qS")) != EOF)
#else
while ((c = getopt(argc, argv, "C:d:l:s:t:z:f:p:P:q")) != EOF)
#endif
switch (c) {
#ifdef GEN_AXFR
case 'C':
class = get_class(optarg);
break;
#endif
case 'd':
#ifdef DEBUG
debug = atoi(optarg);
#endif
break;
case 'l':
ddtfile = (char *)malloc(strlen(optarg) +
sizeof(".XXXXXX") + 1);
if (!ddtfile)
panic(errno, "malloc(ddtfile)");
#ifdef SHORT_FNAMES
filenamecpy(ddtfile, optarg);
#else
(void) strcpy(ddtfile, optarg);
#endif /* SHORT_FNAMES */
(void) strcat(ddtfile, ".XXXXXX");
break;
case 's':
serial_no = strtoul(optarg, (char **)NULL, 10);
break;
case 't':
tracefile = optarg;
break;
case 'z': /* zone == domain */
domain = optarg;
domain_len = strlen(domain);
while ((domain_len > 0) &&
(domain[domain_len-1] == '.'))
domain[--domain_len] = '\0';
break;
case 'f':
dbfile = optarg;
tmpname = (char *)malloc((unsigned)strlen(optarg) +
sizeof(".XXXXXX") + 1);
if (!tmpname)
panic(errno, "malloc(tmpname)");
#ifdef SHORT_FNAMES
filenamecpy(tmpname, optarg);
#else
(void) strcpy(tmpname, optarg);
#endif /* SHORT_FNAMES */
break;
case 'p':
port = htons((u_int16_t)atoi(optarg));
break;
case 'P':
port = (u_int16_t)atoi(optarg);
break;
#ifdef STUBS
case 'S':
stub_only = 1;
break;
#endif
case 'q':
quiet++;
break;
case '?':
default:
usage("unrecognized argument");
/* NOTREACHED */
}
if (!domain || !dbfile || optind >= argc) {
if (!domain)
usage("no domain");
if (!dbfile)
usage("no dbfile");
if (optind >= argc)
usage("not enough arguments");
/* NOTREACHED */
}
if (stat(dbfile, &statbuf) != -1 &&
!S_ISREG(statbuf.st_mode) &&
!S_ISFIFO(statbuf.st_mode))
usage("dbfile must be a regular file or FIFO");
if (tracefile && (fp = fopen(tracefile, "w")) == NULL)
perror(tracefile);
(void) strcat(tmpname, ".XXXXXX");
/* tmpname is now something like "/etc/named/named.bu.db.XXXXXX" */
if ((dbfd = mkstemp(tmpname)) == -1) {
perror(tmpname);
if (!quiet)
syslog(LOG_ERR, "can't make tmpfile (%s): %m\n",
tmpname);
exit(XFER_FAIL);
}
#if HAVE_FCHMOD
if (fchmod(dbfd, 0644) == -1)
#else
if (chmod(tmpname, 0644) == -1)
#endif
{
perror(tmpname);
if (!quiet)
syslog(LOG_ERR, "can't [f]chmod tmpfile (%s): %m\n",
tmpname);
exit(XFER_FAIL);
}
if ((dbfp = fdopen(dbfd, "r+")) == NULL) {
perror(tmpname);
if (!quiet)
syslog(LOG_ERR, "can't fdopen tmpfile (%s)", tmpname);
exit(XFER_FAIL);
}
#ifdef DEBUG
if (debug) {
/* ddtfile is now something like "/usr/tmp/xfer.ddt.XXXXXX" */
if ((ddtd = mkstemp(ddtfile)) == -1) {
perror(ddtfile);
debug = 0;
}
#if HAVE_FCHMOD
else if (fchmod(ddtd, 0644) == -1)
#else
else if (chmod(ddtfile, 0644) == -1)
#endif
{
perror(ddtfile);
debug = 0;
} else if ((ddt = fdopen(ddtd, "w")) == NULL) {
perror(ddtfile);
debug = 0;
} else {
#ifdef HAVE_SETVBUF
setvbuf(ddt, NULL, _IOLBF, BUFSIZ);
#else
setlinebuf(ddt);
#endif
}
}
#endif
/*
* Ignore many types of signals that named (assumed to be our parent)
* considers important- if not, the user controlling named with
* signals usually kills us.
*/
(void) signal(SIGHUP, SIG_IGN);
#ifdef SIGSYS
(void) signal(SIGSYS, SIG_IGN);
#endif
#ifdef DEBUG
if (debug == 0)
#endif
{
(void) signal(SIGINT, SIG_IGN);
(void) signal(SIGQUIT, SIG_IGN);
}
(void) signal(SIGIOT, SIG_IGN);
#if defined(SIGUSR1) && defined(SIGUSR2)
(void) signal(SIGUSR1, SIG_IGN);
(void) signal(SIGUSR2, SIG_IGN);
#else /* SIGUSR1&&SIGUSR2 */
(void) signal(SIGEMT, SIG_IGN);
(void) signal(SIGFPE, SIG_IGN);
#endif /* SIGUSR1&&SIGUSR2 */
dprintf(1, (ddt,
"domain `%s'; file `%s'; serial %lu; closed %d\n",
domain, dbfile, (u_long)serial_no, closed));
buildservicelist();
buildprotolist();
/* init zone data */
zp = &zone;
#ifdef STUBS
if (stub_only)
zp->z_type = Z_STUB;
else
#endif
zp->z_type = Z_SECONDARY;
#ifdef GEN_AXFR
zp->z_class = class;
#endif
zp->z_origin = domain;
zp->z_source = dbfile;
zp->z_addrcnt = 0;
dprintf(1, (ddt, "zone found (%d): \"%s\", source = %s\n",
zp->z_type,
(zp->z_origin[0] == '\0')
? "."
: zp->z_origin,
zp->z_source));
for (; optind != argc; optind++) {
tm = argv[optind];
if (!inet_aton(tm, &zp->z_addr[zp->z_addrcnt])) {
hp = gethostbyname(tm);
if (hp == NULL) {
syslog(LOG_NOTICE,
"uninterpretable server (%s) for %s\n",
tm, zp->z_origin);
continue;
}
bcopy(hp->h_addr,
(char *)&zp->z_addr[zp->z_addrcnt],
INADDRSZ);
dprintf(1, (ddt, "Arg: \"%s\"\n", tm));
}
if (zp->z_addr[zp->z_addrcnt].s_addr == 0) {
syslog(LOG_NOTICE,
"SOA query to 0.0.0.0 (%s) for %s",
tm, zp->z_origin);
continue;
}
if (++zp->z_addrcnt >= NSMAX) {
zp->z_addrcnt = NSMAX;
dprintf(1, (ddt, "NSMAX reached\n"));
break;
}
}
dprintf(1, (ddt, "addrcnt = %d\n", zp->z_addrcnt));
res_init();
_res.options &= ~(RES_DEFNAMES | RES_DNSRCH | RES_RECURSE);
result = getzone(zp, serial_no, port);
(void) my_fclose(dbfp);
switch (result) {
case XFER_SUCCESS: /* ok exit */
if (rename(tmpname, dbfile) == -1) {
perror("rename");
if (!quiet)
syslog(LOG_ERR, "rename %s to %s: %m",
tmpname, dbfile);
exit(XFER_FAIL);
}
exit(XFER_SUCCESS);
case XFER_UPTODATE: /* the zone was already uptodate */
(void) unlink(tmpname);
exit(XFER_UPTODATE);
case XFER_TIMEOUT:
#ifdef DEBUG
if (!debug)
#endif
(void) unlink(tmpname);
exit(XFER_TIMEOUT); /* servers not reachable exit */
case XFER_FAIL:
default:
#ifdef DEBUG
if (!debug)
#endif
(void) unlink(tmpname);
exit(XFER_FAIL); /* yuck exit */
}
/*NOTREACHED*/
}
static char *UsageText[] = {
"\t-z zone_to_transfer\n",
"\t-f db_file\n",
"\t-s serial_no\n",
"\t[-d debug_level]\n",
"\t[-l debug_log_file]\n",
"\t[-t trace_file]\n",
"\t[-p port]\n",
#ifdef STUBS
"\t[-S]\n",
#endif
#ifdef GEN_AXFR
"\t[-C class]\n",
#endif
"\tservers...\n",
NULL
};
static void
usage(msg)
const char *msg;
{
char * const *line;
fprintf(stderr, "Usage error: %s\n", msg);
fprintf(stderr, "Usage: %s\n", ProgName);
for (line = UsageText; *line; line++)
fputs(*line, stderr);
exit(XFER_FAIL);
}
#define DEF_DNAME '\001' /* '\0' means the root domain */
/* XXX: The following variables should probably all be "static" */
int minimum_ttl = 0, got_soa = 0;
int prev_comment = 0; /* was previous record a comment? */
char zone_top[MAXDNAME]; /* the top of the zone */
char prev_origin[MAXDNAME]; /* from most recent $ORIGIN line */
char prev_dname[MAXDNAME] = { DEF_DNAME }; /* from previous record */
char prev_ns_dname[MAXDNAME] = { DEF_DNAME }; /* from most recent NS record */
static int
getzone(zp, serial_no, port)
struct zoneinfo *zp;
u_int32_t serial_no;
int port;
{
HEADER *hp;
u_int16_t len;
u_int32_t serial;
int s, n, l, nscnt, soacnt, error = 0;
u_int cnt;
u_char *cp, *nmp, *eom, *tmp ;
u_char *buf = NULL;
u_int bufsize;
char name[MAXDNAME], name2[MAXDNAME];
struct sockaddr_in sin;
struct zoneinfo zp_start, zp_finish;
#ifdef POSIX_SIGNALS
struct sigaction sv, osv;
#else
struct sigvec sv, osv;
#endif
int qdcount, ancount, aucount, class, type;
const char *badsoa_msg = "Nil";
#ifdef DEBUG
if (debug) {
(void)fprintf(ddt,"getzone() %s ", zp->z_origin);
switch (zp->z_type) {
case Z_STUB:
fprintf(ddt,"stub\n");
break;
case Z_SECONDARY:
fprintf(ddt,"secondary\n");
break;
default:
fprintf(ddt,"unknown type\n");
}
}
#endif
#ifdef POSIX_SIGNALS
bzero((char *)&sv, sizeof sv);
sv.sa_handler = (SIG_FN (*)()) read_alarm;
/* SA_ONSTACK isn't recommended for strict POSIX code */
/* is it absolutely necessary? */
/* sv.sa_flags = SA_ONSTACK; */
sigfillset(&sv.sa_mask);
(void) sigaction(SIGALRM, &sv, &osv);
#else
bzero((char *)&sv, sizeof sv);
sv.sv_handler = read_alarm;
sv.sv_mask = ~0;
(void) sigvec(SIGALRM, &sv, &osv);
#endif
strcpy(zone_top, zp->z_origin);
if ((l = strlen(zone_top)) != 0 && zone_top[l - 1] == '.')
zone_top[l - 1] = '\0';
strcpy(prev_origin, zone_top);
for (cnt = 0; cnt < zp->z_addrcnt; cnt++) {
#ifdef GEN_AXFR
curclass = zp->z_class;
#else
curclass = C_IN;
#endif
error = 0;
if (buf == NULL) {
if ((buf = (u_char *)malloc(2 * PACKETSZ)) == NULL) {
syslog(LOG_INFO, "malloc(%u) failed",
2 * PACKETSZ);
error++;
break;
}
bufsize = 2 * PACKETSZ;
}
bzero((char *)&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = (u_int16_t)port;
sin.sin_addr = zp->z_addr[cnt];
if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
syslog(LOG_INFO, "socket: %m");
error++;
break;
}
dprintf(2, (ddt, "connecting to server #%d [%s].%d\n",
cnt+1, inet_ntoa(sin.sin_addr),
ntohs(sin.sin_port)));
if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
if (!quiet)
syslog(LOG_INFO,
"connect(%s) for zone %s failed: %m",
inet_ntoa(sin.sin_addr), zp->z_origin);
error++;
(void) my_close(s);
continue;
}
#ifndef GEN_AXFR
tryagain:
#endif
n = res_mkquery(QUERY, zp->z_origin, curclass,
T_SOA, NULL, 0, NULL, buf, bufsize);
if (n < 0) {
if (!quiet)
syslog(LOG_INFO,
"zone %s: res_mkquery T_SOA failed",
zp->z_origin);
(void) my_close(s);
#ifdef POSIX_SIGNALS
(void) sigaction(SIGALRM, &osv, (struct sigaction *)0);
#else
(void) sigvec(SIGALRM, &osv, (struct sigvec *)0);
#endif
return (XFER_FAIL);
}
/*
* Send length & message for SOA query
*/
if (writemsg(s, buf, n) < 0) {
syslog(LOG_INFO, "writemsg: %m");
error++;
(void) my_close(s);
continue;
}
/*
* Get out your butterfly net and catch the SOA
*/
if (netread(s, (char *)buf, INT16SZ, XFER_TIMER) < 0) {
error++;
(void) my_close(s);
continue;
}
if ((len = _getshort(buf)) == 0) {
(void) my_close(s);
continue;
}
if (len > bufsize) {
if ((buf = (u_char *)realloc(buf, len)) == NULL) {
syslog(LOG_INFO,
"malloc(%u) failed for SOA from server [%s], zone %s\n",
len,
inet_ntoa(sin.sin_addr),
zp->z_origin);
(void) my_close(s);
continue;
}
bufsize = len;
}
if (netread(s, (char *)buf, len, XFER_TIMER) < 0) {
error++;
(void) my_close(s);
continue;
}
#ifdef DEBUG
if (debug >= 3) {
(void)fprintf(ddt,"len = %d\n", len);
fp_nquery(buf, len, ddt);
}
#endif
hp = (HEADER *) buf;
qdcount = ntohs(hp->qdcount);
ancount = ntohs(hp->ancount);
aucount = ntohs(hp->nscount);
/*
* close socket if any of these apply:
* 1) rcode != NOERROR
* 2) not an authority response
* 3) not an answer to our question
* 4) both the number of answers and authority count < 1)
*/
if (hp->rcode != NOERROR || !hp->aa || qdcount != 1 ||
(ancount < 1 && aucount < 1)) {
#ifndef GEN_AXFR
if (curclass == C_IN) {
dprintf(1, (ddt, "SOA failed, trying C_HS\n"));
curclass = C_HS;
goto tryagain;
}
#endif
syslog(LOG_NOTICE,
"[%s] %s for %s, SOA query got rcode %d, aa %d, ancount %d, aucount %d",
inet_ntoa(sin.sin_addr),
(hp->aa
? (qdcount==1 ?"no SOA found" :"bad response")
: "not authoritative"),
zp->z_origin[0] != '\0' ? zp->z_origin : ".",
hp->rcode, hp->aa, ancount, aucount);
error++;
(void) my_close(s);
continue;
}
zp_start = *zp;
if ((int)len < HFIXEDSZ + QFIXEDSZ) {
badsoa_msg = "too short";
badsoa:
syslog(LOG_INFO,
"malformed SOA from [%s], zone %s: %s",
inet_ntoa(sin.sin_addr), zp->z_origin,
badsoa_msg);
error++;
(void) my_close(s);
continue;
}
/*
* Step through response.
*/
tmp = buf + HFIXEDSZ;
eom = buf + len;
/* Query Section. */
n = dn_expand(buf, eom, tmp, name2, sizeof name2);
if (n < 0) {
badsoa_msg = "qname error";
goto badsoa;
}
tmp += n;
GETSHORT(type, tmp);
GETSHORT(class, tmp);
if (class != curclass || type != T_SOA ||
strcasecmp(zp->z_origin, name2) != 0) {
syslog(LOG_INFO,
"wrong query in resp from [%s], zone %s: [%s %s %s]\n",
inet_ntoa(sin.sin_addr), zp->z_origin,
name2, p_class(class), p_type(type));
error++;
(void) my_close(s);
continue;
}
/* ... Answer Section. */
n = dn_expand(buf, eom, tmp, name2, sizeof name2);
if (n < 0) {
badsoa_msg = "aname error";
goto badsoa;
}
tmp += n;
if (strcasecmp(zp->z_origin, name2) != 0) {
syslog(LOG_INFO,
"wrong answer in resp from [%s], zone %s: [%s %s %s]\n",
inet_ntoa(sin.sin_addr), zp->z_origin,
name2, p_class(class), p_type(type));
error++;
(void) my_close(s);
continue;
}
badsoa_msg = soa_zinfo(&zp_start, tmp, eom);
if (badsoa_msg)
goto badsoa;
if (SEQ_GT(zp_start.z_serial, serial_no) || !serial_no) {
const char *l, *nl;
dprintf(1, (ddt, "need update, serial %lu\n",
(u_long)zp_start.z_serial));
hp = (HEADER *) buf;
soacnt = 0;
nscnt = 0;
gettime(&tt);
for (l = Version; l; l = nl) {
size_t len;
if ((nl = strchr(l, '\n')) != NULL) {
len = nl - l;
nl = nl + 1;
} else {
len = strlen(l);
nl = NULL;
}
while (isspace((unsigned char) *l))
l++;
if (*l)
fprintf(dbfp, "; BIND version %.*s\n",
(int)len, l);
}
fprintf(dbfp, "; zone '%s' last serial %lu\n",
domain, (u_long)serial_no);
fprintf(dbfp, "; from %s at %s",
inet_ntoa(sin.sin_addr),
ctimel(tt.tv_sec));
for (;;) {
if ((soacnt == 0) || (zp->z_type == Z_STUB)) {
int type;
#ifdef STUBS
if (zp->z_type == Z_STUB) {
if (!soacnt)
type = T_SOA;
else if (!nscnt)
type = T_NS;
else
type = T_SOA;
} else
#endif
type = T_AXFR;
n = res_mkquery(QUERY, zp->z_origin,
curclass, type,
NULL, 0,
NULL, buf, bufsize);
if (n < 0) {
if (!quiet) {
#ifdef STUBS
if (zp->z_type == Z_STUB)
syslog(LOG_INFO,
(type == T_SOA)
? "zone %s: res_mkquery T_SOA failed"
: "zone %s: res_mkquery T_NS failed",
zp->z_origin);
else
#endif
syslog(LOG_INFO,
"zone %s: res_mkquery T_AXFR failed",
zp->z_origin);
}
(void) my_close(s);
#ifdef POSIX_SIGNALS
sigaction(SIGALRM, &osv,
(struct sigaction *)0);
#else
sigvec(SIGALRM, &osv,
(struct sigvec *)0);
#endif
return (XFER_FAIL);
}
/*
* Send length & msg for zone transfer
*/
if (writemsg(s, buf, n) < 0) {
syslog(LOG_INFO,
"writemsg: %m");
error++;
(void) my_close(s);
break;
}
}
/*
* Receive length & response
*/
if (netread(s, (char *)buf, INT16SZ,
(soacnt == 0) ?300 :XFER_TIMER)
< 0) {
error++;
break;
}
if ((len = _getshort(buf)) == 0)
break;
eom = buf + len;
if (netread(s, (char *)buf, len, XFER_TIMER)
< 0) {
error++;
break;
}
#ifdef DEBUG
if (debug >= 3) {
(void)fprintf(ddt,"len = %d\n", len);
fp_nquery(buf, len, ddt);
}
if (fp)
fp_nquery(buf, len, fp);
#endif
if (len < HFIXEDSZ) {
badrec:
error++;
syslog(LOG_INFO,
"record too short from [%s], zone %s\n",
inet_ntoa(sin.sin_addr),
zp->z_origin);
break;
}
cp = buf + HFIXEDSZ;
if (hp->qdcount) {
if ((n = dn_skipname(cp, eom)) == -1
|| n + QFIXEDSZ >= eom - cp)
goto badrec;
cp += n + QFIXEDSZ;
}
nmp = cp;
if ((n = dn_skipname(cp, eom)) == -1)
goto badrec;
tmp = cp + n;
#ifdef STUBS
if (zp->z_type == Z_STUB) {
ancount = ntohs(hp->ancount);
for (cnt = 0 ; cnt < ancount ; cnt++) {
n = print_output(buf, bufsize, cp);
cp += n;
}
if (hp->nscount) {
/* we should not get here */
ancount = ntohs(hp->nscount);
for (cnt = 0 ; cnt < ancount ; cnt++) {
n = print_output(buf, bufsize, cp);
cp += n;
}
}
ancount = ntohs(hp->arcount);
for (cnt = 0 ; cnt < ancount ; cnt ++) {
n = print_output(buf, bufsize, cp);
cp += n;
}
if (cp != eom) {
syslog(LOG_INFO,
"print_output: short answer (%d, %d), zone %s",
cp - buf, n, zp->z_origin);
error++;
break;
}
} else {
#endif /*STUBS*/
n = print_output(buf, bufsize, cp);
if (cp + n != eom) {
syslog(LOG_INFO,
"print_output: short answer (%d, %d), zone %s",
cp - buf, n, zp->z_origin);
error++;
break;
}
#ifdef STUBS
}
#endif
GETSHORT(n, tmp);
if (n == T_SOA) {
if (soacnt == 0) {
soacnt++;
if (dn_expand(buf, buf+PACKETSZ, nmp,
name, sizeof name) < 0) {
badsoa_msg = "soa name error";
goto badsoa;
}
if (strcasecmp(name, zp->z_origin)!=0){
syslog(LOG_INFO,
"wrong zone name in AXFR (wanted \"%s\", got \"%s\")",
zp->z_origin, name);
badsoa_msg = "wrong soa name";
goto badsoa;
}
if (eom - tmp
<= 2 * INT16SZ + INT32SZ) {
badsoa_msg = "soa header";
goto badsoa;
}
tmp += 2 * INT16SZ + INT32SZ;
if ((n = dn_skipname(tmp, eom)) < 0) {
badsoa_msg = "soa mname";
goto badsoa;
}
tmp += n;
if ((n = dn_skipname(tmp, eom)) < 0) {
badsoa_msg = "soa hname";
goto badsoa;
}
tmp += n;
if (eom - tmp <= INT32SZ) {
badsoa_msg = "soa dlen";
goto badsoa;
}
GETLONG(serial, tmp);
dprintf(3, (ddt,
"first SOA for %s, serial %lu\n",
name, (u_long)serial));
continue;
}
if (dn_expand(buf, buf+PACKETSZ, nmp,
name2, sizeof name2) == -1) {
badsoa_msg = "soa name error#2";
goto badsoa;
}
if (strcasecmp((char *)name,
(char *)name2) != 0) {
syslog(LOG_INFO,
"got extra SOA for \"%s\" in zone \"%s\"",
name2, name);
continue;
}
tmp -= INT16SZ; /* Put TYPE back. */
badsoa_msg = soa_zinfo(&zp_finish, tmp, eom);
if (badsoa_msg)
goto badsoa;
dprintf(2, (ddt,
"SOA, serial %lu\n",
(u_long)zp_finish.z_serial));
if (serial != zp_finish.z_serial) {
soacnt = 0;
got_soa = 0;
minimum_ttl = 0;
strcpy(prev_origin, zp->z_origin);
prev_dname[0] = DEF_DNAME;
dprintf(1, (ddt,
"serial changed, restart\n"
));
/*
* Flush buffer, truncate file
* and seek to beginning to restart.
*/
fflush(dbfp);
if (ftruncate(fileno(dbfp), 0) != 0) {
if (!quiet)
syslog(LOG_INFO,
"ftruncate %s: %m\n",
tmpname);
return (XFER_FAIL);
}
fseek(dbfp, 0L, 0);
} else
break;
#ifdef STUBS
} else if (zp->z_type == Z_STUB && n == T_NS) {
nscnt++;
} else if (zp->z_type == Z_STUB) {
break;
#endif
}
}
(void) my_close(s);
if (error == 0) {
#ifdef POSIX_SIGNALS
(void) sigaction(SIGALRM, &osv,
(struct sigaction *)0);
#else
(void) sigvec(SIGALRM, &osv, (struct sigvec *)0);
#endif
return (XFER_SUCCESS);
}
dprintf(2, (ddt, "error receiving zone transfer\n"));
} else if (zp_start.z_serial == serial_no) {
(void) my_close(s);
dprintf(1, (ddt,
"zone up-to-date, serial %u\n",
zp_start.z_serial));
return (XFER_UPTODATE);
} else {
(void) my_close(s);
if (!quiet)
syslog(LOG_NOTICE,
"serial from [%s], zone %s: %u lower than current: %u\n",
inet_ntoa(sin.sin_addr), zp->z_origin,
zp_start.z_serial, serial_no);
return (XFER_FAIL);
}
}
#ifdef POSIX_SIGNALS
(void) sigaction(SIGALRM, &osv, (struct sigaction *)0);
#else
(void) sigvec(SIGALRM, &osv, (struct sigvec *)0);
#endif
if (error)
return (XFER_TIMEOUT);
return (XFER_FAIL);
}
/*
* Set flag saying to read was interrupted
* used for a read timer
*/
static SIG_FN
read_alarm()
{
read_interrupted = 1;
}
static int
netread(fd, buf, len, timeout)
int fd;
register char *buf;
register int len;
int timeout;
{
static const char setitimerStr[] = "setitimer: %m";
struct itimerval ival, zeroival;
register int n;
#if defined(NETREAD_BROKEN)
int retries = 0;
#endif
memset(&zeroival, 0, sizeof zeroival);
ival = zeroival;
ival.it_value.tv_sec = timeout;
while (len > 0) {
if (setitimer(ITIMER_REAL, &ival, NULL) < 0) {
syslog(LOG_INFO, setitimerStr);
return (-1);
}
errno = 0;
n = recv(fd, buf, len, 0);
if (n == 0 && errno == 0) {
#if defined(NETREAD_BROKEN)
if (++retries < 42) /* doug adams */
continue;
#endif
syslog(LOG_INFO, "premature EOF, fetching \"%s\"",
domain);
return (-1);
}
if (n < 0) {
if (errno == 0) {
#if defined(NETREAD_BROKEN)
if (++retries < 42) /* doug adams */
continue;
#endif
syslog(LOG_INFO,
"recv(len=%d): n=%d && !errno",
len, n);
return (-1);
}
if (errno == EINTR) {
if (!read_interrupted) {
/* It wasn't a timeout; ignore it. */
continue;
}
errno = ETIMEDOUT;
}
syslog(LOG_INFO, "recv(len=%d): %m", len);
return (-1);
}
buf += n;
len -= n;
}
if (setitimer(ITIMER_REAL, &zeroival, NULL) < 0) {
syslog(LOG_INFO, setitimerStr);
return (-1);
}
return (0);
}
static const char *
soa_zinfo(zp, cp, eom)
register struct zoneinfo *zp;
register u_char *cp;
u_char *eom;
{
register int n;
int type, class;
u_long ttl;
/* Are type, class, and ttl OK? */
if (eom - cp < 3 * INT16SZ + INT32SZ)
return ("zinfo too short");
GETSHORT(type, cp);
GETSHORT(class, cp);
GETLONG(ttl, cp);
cp += INT16SZ; /* dlen */
if (type != T_SOA || class != curclass)
return ("zinfo wrong typ/cla/ttl");
/* Skip master name and contact name, we can't validate them. */
if ((n = dn_skipname(cp, eom)) == -1)
return ("zinfo mname");
cp += n;
if ((n = dn_skipname(cp, eom)) == -1)
return ("zinfo hname");
cp += n;
/* Grab the data fields. */
if (eom - cp < 5 * INT32SZ)
return ("zinfo dlen");
GETLONG(zp->z_serial, cp);
GETLONG(zp->z_refresh, cp);
GETLONG(zp->z_retry, cp);
GETLONG(zp->z_expire, cp);
GETLONG(zp->z_minimum, cp);
return (NULL);
}
/*
* Parse the message, determine if it should be printed, and if so, print it
* in .db file form.
* Does minimal error checking on the message content.
*/
static int
print_output(msg, msglen, rrp)
u_char *msg;
int msglen;
u_char *rrp;
{
register u_char *cp;
register HEADER *hp = (HEADER *) msg;
u_int32_t addr, ttl;
int i, j, tab, result, class, type, dlen, n1, n;
char data[BUFSIZ];
u_char *cp1, *cp2, *temp_ptr;
char *cdata, *origin, *proto, dname[MAXDNAME];
char *ignore = "";
cp = rrp;
n = dn_expand(msg, msg + msglen, cp, dname, sizeof dname);
if (n < 0) {
hp->rcode = FORMERR;
return (-1);
}
cp += n;
GETSHORT(type, cp);
GETSHORT(class, cp);
GETLONG(ttl, cp);
GETSHORT(dlen, cp);
origin = strchr(dname, '.');
if (origin == NULL)
origin = "";
else
origin++; /* move past the '.' */
dprintf(3, (ddt,
"print_output: dname %s type %d class %d ttl %d\n",
dname, type, class, ttl));
/*
* Convert the resource record data into the internal database format.
*/
switch (type) {
case T_A:
case T_WKS:
case T_HINFO:
case T_UINFO:
case T_TXT:
case T_X25:
case T_ISDN:
case T_LOC:
case T_NSAP:
case T_UID:
case T_GID:
cp1 = cp;
n = dlen;
cp += n;
break;
case T_CNAME:
case T_MB:
case T_MG:
case T_MR:
case T_NS:
case T_PTR:
n = dn_expand(msg, msg + msglen, cp, data, sizeof data);
if (n < 0) {
hp->rcode = FORMERR;
return (-1);
}
cp += n;
cp1 = (u_char *)data;
n = strlen(data) + 1;
break;
case T_MINFO:
case T_SOA:
case T_RP:
n = dn_expand(msg, msg + msglen, cp, data, sizeof data);
if (n < 0) {
hp->rcode = FORMERR;
return (-1);
}
cp += n;
n = strlen(data) + 1;
cp1 = (u_char *)data + n;
n1 = sizeof data - n;
if (type == T_SOA)
n1 -= 5 * INT32SZ;
n = dn_expand(msg, msg + msglen, cp, (char *)cp1, n1);
if (n < 0) {
hp->rcode = FORMERR;
return (-1);
}
cp += n;
cp1 += strlen((char *) cp1) + 1;
if (type == T_SOA) {
temp_ptr = cp + 4 * INT32SZ;
GETLONG(minimum_ttl, temp_ptr);
n = 5 * INT32SZ;
bcopy((char *) cp, (char *) cp1, n);
cp += n;
cp1 += n;
}
n = cp1 - (u_char *)data;
cp1 = (u_char *)data;
break;
case T_MX:
case T_AFSDB:
case T_RT:
/* grab preference */
bcopy((char *)cp, data, INT16SZ);
cp1 = (u_char *)data + INT16SZ;
cp += INT16SZ;
/* get name */
n = dn_expand(msg, msg + msglen, cp,
(char *)cp1, sizeof data - INT16SZ);
if (n < 0)
return (-1);
cp += n;
/* compute end of data */
cp1 += strlen((char *) cp1) + 1;
/* compute size of data */
n = cp1 - (u_char *)data;
cp1 = (u_char *)data;
break;
case T_PX:
/* grab preference */
bcopy((char *)cp, data, INT16SZ);
cp1 = (u_char *)data + INT16SZ;
cp += INT16SZ;
/* get MAP822 name */
n = dn_expand(msg, msg + msglen, cp,
(char *)cp1, sizeof data - INT16SZ);
if (n < 0)
return (-1);
cp += n;
cp1 += (n = (strlen((char *) cp1) + 1));
n1 = sizeof data - n;
/* get MAPX400 name */
n = dn_expand(msg, msg + msglen, cp, (char *)cp1, n1);
if (n < 0)
return (-1);
cp1 += strlen((char *) cp1) + 1;
n = cp1 - (u_char *)data;
cp1 = (u_char *)data;
break;
default:
syslog(LOG_INFO, "\"%s %s %s\" - unknown type (%d)",
dname, p_class(class), p_type(type), type);
hp->rcode = NOTIMP;
return (-1);
}
if (n > MAXDATA) {
dprintf(1, (ddt,
"update type %d: %d bytes is too much data\n",
type, n));
hp->rcode = FORMERR;
return (-1);
}
cdata = (char *) cp1;
result = cp - rrp;
/*
* Only print one SOA per db file
*/
if (type == T_SOA) {
if (got_soa)
return (result);
else
got_soa++;
}
#ifdef NO_GLUE
/*
* If they are trying to tell us info about something that is
* not in the zone that we are transfering, then ignore it!
* They don't have the authority to tell us this info.
*
* We have to do a bit of checking here - the name that we are
* checking vs is fully qualified & may be in a subdomain of the
* zone in question. We also need to ignore any final dots.
*
* If a domain has both NS records and non-NS records, (for
* example, NS and MX records), then we should ignore the non-NS
* records (except that we should not ignore glue A records).
* XXX: It is difficult to do this properly, so we just compare
* the current dname with that in the most recent NS record.
* This defends against the most common error case,
* where the remote server sends MX records soon after the
* NS records for a particular domain. If sent earlier, we lose. XXX
*/
if (!samedomain(dname, domain)) {
(void) fprintf(dbfp, "; Ignoring info about %s, not in zone %s.\n",
dname, domain);
ignore = "; ";
} else if (type != T_NS && type != T_A &&
strcasecmp(zone_top, dname) != 0 &&
strcasecmp(prev_ns_dname, dname) == 0)
{
(void) fprintf(dbfp, "; Ignoring extra info about %s, invalid after NS delegation.\n",
dname);
ignore = "; ";
}
#endif /*NO_GLUE*/
/*
* If the current record is not being ignored, but the
* previous record was ignored, then we invalidate information
* that might have been altered by ignored records.
* (This means that we sometimes output unnecessary $ORIGIN
* lines, but that is harmless.)
*
* Also update prev_comment now.
*/
if (prev_comment && ignore[0] == '\0') {
prev_dname[0] = DEF_DNAME;
prev_origin[0] = DEF_DNAME;
}
prev_comment = (ignore[0] != '\0');
/*
* set prev_ns_dname if necessary
*/
if (type == T_NS) {
(void) strcpy(prev_ns_dname, dname);
}
/*
* If the origin has changed, print the new origin
*/
if (strcasecmp(prev_origin, origin)) {
(void) strcpy(prev_origin, origin);
(void) fprintf(dbfp, "%s$ORIGIN %s.\n", ignore, origin);
}
tab = 0;
if (strcasecmp(prev_dname, dname)) {
/*
* set the prev_dname to be the current dname, then cut off all
* characters of dname after (and including) the first '.'
*/
char *cutp = strchr(dname, '.');
(void) strcpy(prev_dname, dname);
if (cutp)
*cutp = '\0';
if (dname[0] == 0) {
if (origin[0] == 0)
(void) fprintf(dbfp, "%s.\t", ignore);
else
(void) fprintf(dbfp, "%s.%s.\t",
ignore, origin); /* ??? */
} else
(void) fprintf(dbfp, "%s%s\t", ignore, dname);
if (strlen(dname) < (size_t)8)
tab = 1;
} else {
(void) fprintf(dbfp, "%s\t", ignore);
tab = 1;
}
if (ttl != minimum_ttl)
(void) fprintf(dbfp, "%d\t", (int) ttl);
else if (tab)
(void) putc('\t', dbfp);
(void) fprintf(dbfp, "%s\t%s\t", p_class(class), p_type(type));
cp = (u_char *) cdata;
/*
* Print type specific data
*/
switch (type) {
case T_A:
switch (class) {
case C_IN:
case C_HS:
GETLONG(n, cp);
n = htonl(n);
fputs(inet_ntoa(*(struct in_addr *) &n), dbfp);
break;
}
(void) fprintf(dbfp, "\n");
break;
case T_CNAME:
case T_MB:
case T_MG:
case T_MR:
case T_PTR:
if (cp[0] == '\0')
(void) fprintf(dbfp, ".\n");
else
(void) fprintf(dbfp, "%s.\n", cp);
break;
case T_NS:
cp = (u_char *) cdata;
if (cp[0] == '\0')
(void) fprintf(dbfp, ".\t");
else
(void) fprintf(dbfp, "%s.", cp);
(void) fprintf(dbfp, "\n");
break;
case T_HINFO:
case T_ISDN:
cp2 = cp + n;
for (i = 0; i < 2; i++) {
if (i != 0)
(void) putc(' ', dbfp);
n = *cp++;
cp1 = cp + n;
if (cp1 > cp2)
cp1 = cp2;
(void) putc('"', dbfp);
j = 0;
while (cp < cp1) {
if (*cp == '\0') {
cp = cp1;
break;
}
if ((*cp == '\n') || (*cp == '"')) {
(void) putc('\\', dbfp);
}
(void) putc(*cp++, dbfp);
j++;
}
if (j == 0 && (type != T_ISDN || i == 0))
(void) putc('?', dbfp);
(void) putc('"', dbfp);
}
(void) putc('\n', dbfp);
break;
case T_SOA:
(void) fprintf(dbfp, "%s.", cp);
cp += strlen((char *) cp) + 1;
(void) fprintf(dbfp, " %s. (\n", cp);
cp += strlen((char *) cp) + 1;
GETLONG(n, cp);
(void) fprintf(dbfp, "%s\t\t%lu", ignore, (u_long)n);
GETLONG(n, cp);
(void) fprintf(dbfp, " %lu", (u_long)n);
GETLONG(n, cp);
(void) fprintf(dbfp, " %lu", (u_long)n);
GETLONG(n, cp);
(void) fprintf(dbfp, " %lu", (u_long)n);
GETLONG(n, cp);
(void) fprintf(dbfp, " %lu )\n", (u_long)n);
break;
case T_MX:
case T_AFSDB:
case T_RT:
GETSHORT(n, cp);
(void) fprintf(dbfp, "%lu", (u_long)n);
(void) fprintf(dbfp, " %s.\n", cp);
break;
case T_PX:
GETSHORT(n, cp);
(void) fprintf(dbfp, "%lu", (u_long)n);
(void) fprintf(dbfp, " %s.", cp);
cp += strlen((char *) cp) + 1;
(void) fprintf(dbfp, " %s.\n", cp);
break;
case T_TXT:
case T_X25:
cp1 = cp + n;
(void) putc('"', dbfp);
while (cp < cp1) {
if (i = *cp++) {
for (j = i ; j > 0 && cp < cp1 ; j--) {
if ((*cp == '\n') || (*cp == '"')) {
(void) putc('\\', dbfp);
}
(void) putc(*cp++, dbfp);
}
}
}
(void) fputs("\"\n", dbfp);
break;
case T_NSAP:
fprintf(dbfp, "%s\n", inet_nsap_ntoa(n, cp, NULL));
break;
case T_UINFO:
(void) fprintf(dbfp, "\"%s\"\n", cp);
break;
#ifdef LOC_RR
case T_LOC:
(void) fprintf(dbfp, "%s\n", loc_ntoa(cp, NULL));
break;
#endif /* LOC_RR */
case T_UID:
case T_GID:
if (n == INT32SZ) {
GETLONG(n, cp);
(void) fprintf(dbfp, "%lu\n", (u_long)n);
}
break;
case T_WKS:
GETLONG(addr, cp);
addr = htonl(addr);
fputs(inet_ntoa(*(struct in_addr *) &addr), dbfp);
fputc(' ', dbfp);
proto = protocolname(*cp);
cp += sizeof(char);
(void) fprintf(dbfp, "%s ", proto);
i = 0;
while (cp < (u_char *) cdata + n) {
j = *cp++;
do {
if (j & 0200)
(void) fprintf(dbfp, " %s",
servicename(i, proto));
j <<= 1;
} while (++i & 07);
}
(void) fprintf(dbfp, "\n");
break;
case T_MINFO:
case T_RP:
(void) fprintf(dbfp, "%s.", cp);
cp += strlen((char *) cp) + 1;
(void) fprintf(dbfp, " %s.\n", cp);
break;
default:
(void) fprintf(dbfp, "???\n");
}
if (ferror(dbfp)) {
syslog(LOG_ERR, "%s: %m", tmpname);
exit(XFER_FAIL);
}
return (result);
}
#ifdef SHORT_FNAMES
/*
** This routine handles creating temporary files with mkstemp
** in the presence of a 14 char filename system. Pathconf()
** does not work over NFS.
*/
filenamecpy(ddtfile, optarg)
char *ddtfile, *optarg;
{
int namelen, extra, len;
char *dirname, *filename;
/* determine the length of filename allowed */
if((dirname = strrchr(optarg, '/')) == NULL){
filename = optarg;
} else {
*dirname++ = '\0';
filename = dirname;
}
namelen = pathconf(dirname == NULL? "." : optarg, _PC_NAME_MAX);
if(namelen <= 0)
namelen = 255; /* length could not be determined */
if(dirname != NULL)
*--dirname = '/';
/* copy a shorter name if it will be longer than allowed */
extra = (strlen(filename)+strlen(".XXXXXX")) - namelen;
if(extra > 0){
len = strlen(optarg) - extra;
(void) strncpy(ddtfile, optarg, len);
ddtfile[len] = '\0';
} else
(void) strcpy(ddtfile, optarg);
}
#endif /* SHORT_FNAMES */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.