/* $NetBSD: named-xfer.c,v 1.2 1996/03/21 18:24:16 jtc Exp $ */ /* * 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 #include #include #include #include #if defined(__osf__) # include # include #endif #if defined(_AIX) # include # define TIME_H_INCLUDED #endif #include #include #include #include #include #include #include #include #if !defined(SVR4) || !defined(sun) # include #endif #include #include #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(); int 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 */