692 lines
18 KiB
C
692 lines
18 KiB
C
/* $NetBSD: nsupdate.c,v 1.1.1.1 1999/11/20 18:54:02 veego Exp $ */
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#if !defined(lint) && !defined(SABER)
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static const char rcsid[] = "Id: nsupdate.c,v 8.21 1999/10/19 22:22:59 cyarnell Exp";
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#endif /* not lint */
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/*
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* Copyright (c) 1996,1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#include "port_before.h"
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <res_update.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include <isc/dst.h>
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#include "port_after.h"
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#include "../named/db_defs.h"
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/* XXX all of this stuff should come from libbind.a */
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/*
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* Map class and type names to number
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*/
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struct map {
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char token[10];
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int val;
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};
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struct map class_strs[] = {
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{ "in", C_IN },
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{ "chaos", C_CHAOS },
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{ "hs", C_HS },
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};
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#define M_CLASS_CNT (sizeof(class_strs) / sizeof(struct map))
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struct map type_strs[] = {
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{ "a", T_A },
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{ "ns", T_NS },
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{ "cname", T_CNAME },
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{ "soa", T_SOA },
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{ "mb", T_MB },
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{ "mg", T_MG },
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{ "mr", T_MR },
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{ "null", T_NULL },
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{ "wks", T_WKS },
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{ "ptr", T_PTR },
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{ "hinfo", T_HINFO },
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{ "minfo", T_MINFO },
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{ "mx", T_MX },
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{ "txt", T_TXT },
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{ "rp", T_RP },
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{ "afsdb", T_AFSDB },
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{ "x25", T_X25 },
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{ "isdn", T_ISDN },
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{ "rt", T_RT },
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{ "nsap", T_NSAP },
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{ "nsap_ptr", T_NSAP_PTR },
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{ "sig", T_SIG },
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{ "key", T_KEY },
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{ "px", T_PX },
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{ "loc", T_LOC },
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{ "nxt", T_NXT },
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{ "eid", T_EID },
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{ "nimloc", T_NIMLOC },
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{ "srv", T_SRV },
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{ "atma", T_ATMA },
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{ "naptr", T_NAPTR },
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{ "kx", ns_t_kx },
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{ "cert", ns_t_cert },
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{ "aaaa", ns_t_aaaa },
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};
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#define M_TYPE_CNT (sizeof(type_strs) / sizeof(struct map))
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struct map section_strs[] = {
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{ "zone", S_ZONE },
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{ "prereq", S_PREREQ },
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{ "update", S_UPDATE },
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{ "reserved", S_ADDT },
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};
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#define M_SECTION_CNT (sizeof(section_strs) / sizeof(struct map))
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struct map opcode_strs[] = {
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{ "nxdomain", NXDOMAIN },
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{ "yxdomain", YXDOMAIN },
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{ "nxrrset", NXRRSET },
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{ "yxrrset", YXRRSET },
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{ "delete", DELETE },
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{ "add", ADD },
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};
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#define M_OPCODE_CNT (sizeof(opcode_strs) / sizeof(struct map))
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static int getcharstring(char *, char *, int, int, int);
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static char *progname;
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static void usage(void);
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static int getword_str(char *, int, char **, char *);
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static struct __res_state res;
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int dns_findprimary (res_state, char *, struct ns_tsig_key *, char *,
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int, struct in_addr *);
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/*
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* format of file read by nsupdate is kept the same as the log
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* file generated by updates, so that the log file can be fed
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* to nsupdate to reconstruct lost updates.
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*
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* file is read on line at a time using fgets() rather than
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* one word at a time using getword() so that it is easy to
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* adapt nsupdate to read piped input from other scripts
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*
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* overloading of class/type has to be deferred to res_update()
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* because class is needed by res_update() to determined the
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* zone to which a resource record belongs
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*/
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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FILE *fp = NULL;
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char buf[BUFSIZ], buf2[BUFSIZ], hostbuf[100], filebuf[100];
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char dnbuf[MAXDNAME], data[MAXDATA];
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u_char packet[PACKETSZ], answer[PACKETSZ];
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char *host = hostbuf, *batchfile = filebuf;
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char *r_dname, *cp, *startp, *endp, *svstartp;
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char section[15], opcode[10];
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int i, c, n, n1, inside, lineno = 0, vc = 0,
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debug = 0, r_size, r_section, r_opcode,
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prompt = 0, ret = 0, stringtobin = 0;
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int16_t r_class, r_type;
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u_int32_t r_ttl;
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struct map *mp;
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ns_updrec *rrecp;
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ns_updque listuprec;
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struct in_addr hostaddr;
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extern int getopt();
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extern char *optarg;
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extern int optind, opterr, optopt;
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ns_tsig_key key;
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char *keyfile=NULL, *keyname=NULL, *p, *pp;
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int file_major, file_minor, alg;
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progname = argv[0];
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while ((c = getopt(argc, argv, "dsvk:n:")) != -1) {
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switch (c) {
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case 'v':
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vc = 1;
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break;
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case 'd':
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debug = 1;
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break;
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case 's':
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stringtobin = 1;
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break;
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case 'k': {
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/* -k keydir:keyname */
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char *colon;
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if ((colon=strchr(optarg, ':'))==NULL) {
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fprintf(stderr, "key option argument should be keydir:keyname\n");
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exit(1);
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}
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keyname=colon+1;
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keyfile=optarg;
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*colon='\0';
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break;
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}
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case 'n':
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keyname=optarg;
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break;
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default:
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usage();
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}
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}
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if (keyfile) {
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#ifdef PARSE_KEYFILE
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if ((fp=fopen(keyfile, "r"))==NULL) {
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perror("open keyfile");
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exit(1);
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}
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/* now read the header info from the file */
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if ((i=fread(buf, 1, BUFSIZ, fp)) < 5) {
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fclose(fp);
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exit(1);
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}
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fclose(fp);
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fp=NULL;
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p=buf;
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n=strlen(p); /* get length of strings */
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n1=strlen("Private-key-format: v");
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if (n1 > n || strncmp(buf, "Private-key-format: v", n1)) {
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fprintf(stderr, "Invalid key file format\n");
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exit(1); /* not a match */
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}
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p+=n1; /* advance pointer */
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sscanf((char *)p, "%d.%d", &file_major, &file_minor);
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/* should do some error checking with these someday */
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while (*p++!='\n'); /* skip to end of line */
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n=strlen(p); /* get length of strings */
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n1=strlen("Algorithm: ");
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if (n1 > n || strncmp(p, "Algorithm: ", n1)) {
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fprintf(stderr, "Invalid key file format\n");
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exit(1); /* not a match */
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}
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p+=n1; /* advance pointer */
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if (sscanf((char *)p, "%d", &alg)!=1) {
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fprintf(stderr, "Invalid key file format\n");
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exit(1);
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}
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while (*p++!='\n'); /* skip to end of line */
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n=strlen(p); /* get length of strings */
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n1=strlen("Key: ");
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if (n1 > n || strncmp(p, "Key: ", n1)) {
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fprintf(stderr, "Invalid key file format\n");
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exit(1); /* not a match */
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}
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p+=n1; /* advance pointer */
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pp=p;
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while (*pp++!='\n'); /* skip to end of line, terminate it */
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*--pp='\0';
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key.data=malloc(1024*sizeof(char));
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key.len=b64_pton(p, key.data, 1024);
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strcpy(key.name, keyname);
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strcpy(key.alg, "HMAC-MD5.SIG-ALG.REG.INT");
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#else
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/* use the dst* routines to parse the key files
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*
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* This requires that both the .key and the .private files
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* exist in your cwd, so the keyfile parmeter here is
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* assumed to be a path in which the K*.{key,private} files
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* exist.
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*/
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DST_KEY *dst_key;
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char cwd[PATH_MAX+1];
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if (getcwd(cwd, PATH_MAX)==NULL) {
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perror("unable to get current directory");
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exit(1);
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}
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if (chdir(keyfile)<0) {
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fprintf(stderr, "unable to chdir to %s: %s\n", keyfile,
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strerror(errno));
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exit(1);
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}
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dst_init();
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dst_key = dst_read_key(keyname,
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0 /* not used for private keys */,
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KEY_HMAC_MD5, DST_PRIVATE);
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if (!dst_key) {
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fprintf(stderr, "dst_read_key: error reading key\n");
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exit(1);
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}
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key.data=malloc(1024*sizeof(char));
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dst_key_to_buffer(dst_key, key.data, 1024);
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key.len=dst_key->dk_key_size;
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strcpy(key.name, keyname);
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strcpy(key.alg, "HMAC-MD5.SIG-ALG.REG.INT");
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if (chdir(cwd)<0) {
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fprintf(stderr, "unable to chdir to %s: %s\n", cwd,
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strerror(errno));
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exit(1);
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}
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#endif
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}
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if ((argc - optind) == 0) {
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/* no file specified, read from stdin */
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ret = system("tty -s");
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if (ret == 0) /* terminal */
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prompt = 1;
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else /* stdin redirect from a file or a pipe */
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prompt = 0;
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} else {
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/* file specified, open it */
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/* XXX - currently accepts only one filename */
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if ((fp = fopen(argv[optind], "r")) == NULL) {
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fprintf(stderr, "error opening file: %s\n", argv[optind]);
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exit (1);
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}
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}
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for (;;) {
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inside = 1;
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if (prompt)
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fprintf(stdout, "> ");
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if (!fp)
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cp = fgets(buf, sizeof buf, stdin);
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else
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cp = fgets(buf, sizeof buf, fp);
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if (cp == NULL) /* EOF */
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break;
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lineno++;
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/* get rid of the trailing newline */
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n = strlen(buf);
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buf[--n] = '\0';
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startp = cp;
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endp = strchr(cp, ';');
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if (endp != NULL)
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endp--;
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else
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endp = cp + n - 1;
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/* verify section name */
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if (!getword_str(section, sizeof section, &startp, endp)) {
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/* empty line */
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inside = 0;
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}
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if (inside) {
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/* inside the same update packet,
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* continue accumulating records */
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r_section = -1;
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n1 = strlen(section);
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if (section[n1-1] == ':')
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section[--n1] = '\0';
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for (mp = section_strs; mp < section_strs+M_SECTION_CNT; mp++)
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if (!strcasecmp(section, mp->token)) {
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r_section = mp->val;
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break;
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}
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if (r_section == -1) {
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fprintf(stderr, "incorrect section name: %s\n", section);
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exit (1);
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}
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if (r_section == S_ZONE) {
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fprintf(stderr, "section ZONE not permitted\n");
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exit (1);
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}
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/* read operation code */
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if (!getword_str(opcode, sizeof opcode, &startp, endp)) {
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fprintf(stderr, "failed to read operation code\n");
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exit (1);
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}
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r_opcode = -1;
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if (opcode[0] == '{') {
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n1 = strlen(opcode);
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for (i = 0; i < n1; i++)
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opcode[i] = opcode[i+1];
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if (opcode[n1-2] == '}')
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opcode[n1-2] = '\0';
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}
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for (mp = opcode_strs; mp < opcode_strs+M_OPCODE_CNT; mp++) {
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if (!strcasecmp(opcode, mp->token)) {
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r_opcode = mp->val;
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break;
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}
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}
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if (r_opcode == -1) {
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fprintf(stderr, "incorrect operation code: %s\n", opcode);
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exit (1);
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}
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/* read owner's domain name */
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if (!getword_str(dnbuf, sizeof dnbuf, &startp, endp)) {
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fprintf(stderr, "failed to read owner name\n");
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exit (1);
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}
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r_dname = dnbuf;
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r_ttl = 0;
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r_type = -1;
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r_class = C_IN; /* default to IN */
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r_size = 0;
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(void) getword_str(buf2, sizeof buf2, &startp, endp);
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if (isdigit(buf2[0])) { /* ttl */
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r_ttl = strtoul(buf2, 0, 10);
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if (errno == ERANGE && r_ttl == ULONG_MAX) {
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fprintf(stderr, "oversized ttl: %s\n", buf2);
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exit (1);
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}
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(void) getword_str(buf2, sizeof buf2, &startp, endp);
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}
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if (buf2[0]) { /* possibly class */
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for (mp = class_strs; mp < class_strs+M_CLASS_CNT; mp++) {
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if (!strcasecmp(buf2, mp->token)) {
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r_class = mp->val;
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(void) getword_str(buf2, sizeof buf2, &startp, endp);
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break;
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}
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}
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}
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/*
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* type and rdata field may or may not be required depending
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* on the section and operation
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*/
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switch (r_section) {
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case S_PREREQ:
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if (r_ttl) {
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fprintf(stderr, "nonzero ttl in prereq section: %ul\n",
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r_ttl);
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r_ttl = 0;
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}
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switch (r_opcode) {
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case NXDOMAIN:
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case YXDOMAIN:
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if (buf2[0]) {
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fprintf (stderr, "invalid field: %s, ignored\n",
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buf2);
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exit (1);
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}
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break;
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case NXRRSET:
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case YXRRSET:
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if (buf2[0])
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for (mp = type_strs; mp < type_strs+M_TYPE_CNT; mp++)
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if (!strcasecmp(buf2, mp->token)) {
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r_type = mp->val;
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break;
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}
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if (r_type == -1) {
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fprintf (stderr, "invalid type for RRset: %s\n",
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buf2);
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exit (1);
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}
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if (r_opcode == NXRRSET)
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break;
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/*
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* for RRset exists (value dependent) case,
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* nonempty rdata field will be present.
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* simply copy the whole string now and let
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* res_update() interpret the various fields
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* depending on type
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*/
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cp = startp;
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while (cp <= endp && isspace(*cp))
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cp++;
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r_size = endp - cp + 1;
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break;
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default:
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fprintf (stderr,
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"unknown operation in prereq section\"%s\"\n",
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opcode);
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exit (1);
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}
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break;
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case S_UPDATE:
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switch (r_opcode) {
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case DELETE:
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r_ttl = 0;
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r_type = T_ANY;
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/* read type, if specified */
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if (buf2[0])
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for (mp = type_strs; mp < type_strs+M_TYPE_CNT; mp++)
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if (!strcasecmp(buf2, mp->token)) {
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r_type = mp->val;
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svstartp = startp;
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(void) getword_str(buf2, sizeof buf2,
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&startp, endp);
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if (buf2[0]) /* unget preference */
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startp = svstartp;
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break;
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}
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/* read rdata portion, if specified */
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cp = startp;
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while (cp <= endp && isspace(*cp))
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cp++;
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r_size = endp - cp + 1;
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break;
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case ADD:
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if (r_ttl == 0) {
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fprintf (stderr,
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"ttl must be specified for record to be added: %s\n", buf);
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exit (1);
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}
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/* read type */
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if (buf2[0])
|
|
for (mp = type_strs; mp < type_strs+M_TYPE_CNT; mp++)
|
|
if (!strcasecmp(buf2, mp->token)) {
|
|
r_type = mp->val;
|
|
break;
|
|
}
|
|
if (r_type == -1) {
|
|
fprintf(stderr,
|
|
"invalid type for record to be added: %s\n", buf2);
|
|
exit (1);
|
|
}
|
|
/* read rdata portion */
|
|
cp = startp;
|
|
while (cp < endp && isspace(*cp))
|
|
cp++;
|
|
r_size = endp - cp + 1;
|
|
if (r_size <= 0) {
|
|
fprintf(stderr,
|
|
"nonempty rdata field needed to add the record at line %d\n",
|
|
lineno);
|
|
exit (1);
|
|
}
|
|
break;
|
|
default:
|
|
fprintf(stderr,
|
|
"unknown operation in update section \"%s\"\n", opcode);
|
|
exit (1);
|
|
}
|
|
break;
|
|
default:
|
|
fprintf(stderr,
|
|
"unknown section identifier \"%s\"\n", section);
|
|
exit (1);
|
|
}
|
|
|
|
if ( !(rrecp = res_mkupdrec(r_section, r_dname, r_class,
|
|
r_type, r_ttl)) ||
|
|
(r_size > 0 && !(rrecp->r_data = (u_char *)malloc(r_size))) ) {
|
|
if (rrecp)
|
|
res_freeupdrec(rrecp);
|
|
fprintf(stderr, "saverrec error\n");
|
|
exit (1);
|
|
}
|
|
if (stringtobin) {
|
|
switch(r_opcode) {
|
|
case T_HINFO:
|
|
if (!getcharstring(buf,(char *)data,2,2,lineno))
|
|
exit(1);
|
|
cp = data;
|
|
break;
|
|
case T_ISDN:
|
|
if (!getcharstring(buf,(char *)data,1,2,lineno))
|
|
exit(1);
|
|
cp = data;
|
|
break;
|
|
case T_TXT:
|
|
if (!getcharstring(buf,(char *)data,1,0,lineno))
|
|
exit(1);
|
|
cp = data;
|
|
break;
|
|
case T_X25:
|
|
if (!getcharstring(buf,(char *)data,1,1,lineno))
|
|
exit(1);
|
|
cp = data;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
rrecp->r_opcode = r_opcode;
|
|
rrecp->r_size = r_size;
|
|
(void) strncpy((char *)rrecp->r_data, cp, r_size);
|
|
APPEND(listuprec, rrecp, r_link);
|
|
} else { /* end of an update packet */
|
|
(void) res_ninit(&res);
|
|
if (vc)
|
|
res.options |= RES_USEVC | RES_STAYOPEN;
|
|
if (debug)
|
|
res.options |= RES_DEBUG;
|
|
if (!EMPTY(listuprec)) {
|
|
n = res_nupdate(&res, HEAD(listuprec),
|
|
keyfile != NULL ? &key : NULL);
|
|
if (n < 0)
|
|
fprintf(stderr, "failed update packet\n");
|
|
while (!EMPTY(listuprec)) {
|
|
ns_updrec *tmprrecp = HEAD(listuprec);
|
|
|
|
UNLINK(listuprec, tmprrecp, r_link);
|
|
if (tmprrecp->r_size != 0)
|
|
free((char *)tmprrecp->r_data);
|
|
res_freeupdrec(tmprrecp);
|
|
}
|
|
}
|
|
}
|
|
} /* for */
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
usage() {
|
|
fprintf(stderr, "Usage: %s [ -k keydir:keyname ] [-d] [-v] [file]\n",
|
|
progname);
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* Get a whitespace delimited word from a string (not file)
|
|
* into buf. modify the start pointer to point after the
|
|
* word in the string.
|
|
*/
|
|
static int
|
|
getword_str(char *buf, int size, char **startpp, char *endp) {
|
|
char *cp;
|
|
int c;
|
|
|
|
for (cp = buf; *startpp <= endp; ) {
|
|
c = **startpp;
|
|
if (isspace(c) || c == '\0') {
|
|
if (cp != buf) /* trailing whitespace */
|
|
break;
|
|
else { /* leading whitespace */
|
|
(*startpp)++;
|
|
continue;
|
|
}
|
|
}
|
|
(*startpp)++;
|
|
if (cp >= buf+size-1)
|
|
break;
|
|
*cp++ = (u_char)c;
|
|
}
|
|
*cp = '\0';
|
|
return (cp != buf);
|
|
}
|
|
|
|
#define MAXCHARSTRING 255
|
|
|
|
static int
|
|
getcharstring(char *buf, char *data,
|
|
int minfields, int maxfields, int lineno)
|
|
{
|
|
int nfield = 0, n = 0, i;
|
|
|
|
do {
|
|
nfield++;
|
|
i = 0;
|
|
if (*buf == '"') {
|
|
buf++;
|
|
while(buf[i] && buf[i] != '"')
|
|
i++;
|
|
} else {
|
|
while(isspace(*buf))
|
|
i++;
|
|
}
|
|
if (i > MAXCHARSTRING) {
|
|
fprintf(stderr,
|
|
"%d: RDATA field %d too long",
|
|
lineno, nfield);
|
|
return(0);
|
|
}
|
|
if (n + i + 1 > MAXDATA) {
|
|
fprintf(stderr,
|
|
"%d: total RDATA too long", lineno);
|
|
return(0);
|
|
}
|
|
data[n]=i;
|
|
memmove(data + 1 + n, buf, i);
|
|
buf += i + 1;
|
|
n += i + 1;
|
|
while(*buf && isspace(*buf))
|
|
buf++;
|
|
} while (nfield < maxfields && *buf);
|
|
|
|
if (nfield < minfields) {
|
|
fprintf(stderr,
|
|
"%d: expected %d RDATA fields, only saw %d",
|
|
lineno, minfields, nfield);
|
|
return (0);
|
|
}
|
|
|
|
return (n);
|
|
}
|