1198 lines
27 KiB
C
1198 lines
27 KiB
C
/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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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 ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*! \file
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* \brief
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* Based on the Dynamic DNS reference implementation by Viraj Bais
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* <viraj_bais@ccm.fm.intel.com>
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*/
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#if !defined(lint) && !defined(SABER)
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static const char rcsid[] = "$Id: res_mkupdate.c,v 1.10 2008/12/11 09:59:00 marka Exp $";
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "port_before.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.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 <string.h>
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#include <unistd.h>
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#include <ctype.h>
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#ifdef _LIBC
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#include <isc/list.h>
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#endif
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#include "port_after.h"
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/* Options. Leave them on. */
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#define DEBUG
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#define MAXPORT 1024
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static int getnum_str(u_char **, u_char *);
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static int gethexnum_str(u_char **, u_char *);
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static int getword_str(char *, int, u_char **, u_char *);
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static int getstr_str(char *, int, u_char **, u_char *);
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#define ShrinkBuffer(x) if ((buflen -= x) < 0) return (-2);
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/* Forward. */
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#ifdef _LIBC
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static
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#endif
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int res_protocolnumber(const char *);
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#ifdef _LIBC
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static
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#endif
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int res_servicenumber(const char *);
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/*%
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* Form update packets.
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* Returns the size of the resulting packet if no error
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*
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* On error,
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* returns
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*\li -1 if error in reading a word/number in rdata
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* portion for update packets
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*\li -2 if length of buffer passed is insufficient
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*\li -3 if zone section is not the first section in
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* the linked list, or section order has a problem
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*\li -4 on a number overflow
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*\li -5 unknown operation or no records
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*/
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int
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res_nmkupdate(res_state statp, ns_updrec *rrecp_in, u_char *buf, int buflen) {
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ns_updrec *rrecp_start = rrecp_in;
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HEADER *hp;
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u_char *cp, *sp2, *startp, *endp;
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int n, i, soanum, multiline;
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ns_updrec *rrecp;
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struct in_addr ina;
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struct in6_addr in6a;
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char buf2[MAXDNAME];
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u_char buf3[MAXDNAME];
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int section, numrrs = 0, counts[ns_s_max];
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u_int16_t rtype, rclass;
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u_int32_t n1, rttl;
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u_char *dnptrs[20], **dpp, **lastdnptr;
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#ifndef _LIBC
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int siglen;
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#endif
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int keylen, certlen;
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/*
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* Initialize header fields.
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*/
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if ((buf == NULL) || (buflen < HFIXEDSZ))
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return (-1);
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memset(buf, 0, HFIXEDSZ);
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hp = (HEADER *) buf;
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statp->id = res_nrandomid(statp);
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hp->id = htons(statp->id);
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hp->opcode = ns_o_update;
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hp->rcode = NOERROR;
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cp = buf + HFIXEDSZ;
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buflen -= HFIXEDSZ;
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dpp = dnptrs;
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*dpp++ = buf;
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*dpp++ = NULL;
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lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
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if (rrecp_start == NULL)
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return (-5);
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else if (rrecp_start->r_section != S_ZONE)
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return (-3);
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memset(counts, 0, sizeof counts);
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for (rrecp = rrecp_start; rrecp; rrecp = NEXT(rrecp, r_glink)) {
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numrrs++;
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section = rrecp->r_section;
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if (section < 0 || section >= ns_s_max)
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return (-1);
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counts[section]++;
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for (i = section + 1; i < ns_s_max; i++)
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if (counts[i])
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return (-3);
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rtype = rrecp->r_type;
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rclass = rrecp->r_class;
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rttl = rrecp->r_ttl;
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/* overload class and type */
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if (section == S_PREREQ) {
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rttl = 0;
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switch (rrecp->r_opcode) {
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case YXDOMAIN:
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rclass = C_ANY;
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rtype = T_ANY;
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rrecp->r_size = 0;
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break;
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case NXDOMAIN:
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rclass = C_NONE;
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rtype = T_ANY;
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rrecp->r_size = 0;
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break;
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case NXRRSET:
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rclass = C_NONE;
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rrecp->r_size = 0;
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break;
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case YXRRSET:
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if (rrecp->r_size == 0)
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rclass = C_ANY;
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break;
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default:
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fprintf(stderr,
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"res_mkupdate: incorrect opcode: %d\n",
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rrecp->r_opcode);
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fflush(stderr);
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return (-1);
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}
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} else if (section == S_UPDATE) {
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switch (rrecp->r_opcode) {
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case DELETE:
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rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
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break;
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case ADD:
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break;
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default:
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fprintf(stderr,
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"res_mkupdate: incorrect opcode: %d\n",
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rrecp->r_opcode);
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fflush(stderr);
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return (-1);
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}
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}
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/*
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* XXX appending default domain to owner name is omitted,
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* fqdn must be provided
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*/
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if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
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lastdnptr)) < 0)
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return (-1);
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cp += n;
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ShrinkBuffer(n + 2*INT16SZ);
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PUTSHORT(rtype, cp);
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PUTSHORT(rclass, cp);
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if (section == S_ZONE) {
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if (numrrs != 1 || rrecp->r_type != T_SOA)
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return (-3);
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continue;
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}
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ShrinkBuffer(INT32SZ + INT16SZ);
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PUTLONG(rttl, cp);
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sp2 = cp; /*%< save pointer to length byte */
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cp += INT16SZ;
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if (rrecp->r_size == 0) {
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if (section == S_UPDATE && rclass != C_ANY)
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return (-1);
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else {
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PUTSHORT(0, sp2);
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continue;
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}
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}
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startp = rrecp->r_data;
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endp = startp + rrecp->r_size - 1;
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/* XXX this should be done centrally. */
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switch (rrecp->r_type) {
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case T_A:
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if (!getword_str(buf2, sizeof buf2, &startp, endp))
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return (-1);
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if (!inet_aton(buf2, &ina))
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return (-1);
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n1 = ntohl(ina.s_addr);
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ShrinkBuffer(INT32SZ);
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PUTLONG(n1, cp);
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break;
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case T_CNAME:
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case T_MB:
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case T_MG:
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case T_MR:
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case T_NS:
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case T_PTR:
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case ns_t_dname:
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if (!getword_str(buf2, sizeof buf2, &startp, endp))
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return (-1);
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n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
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if (n < 0)
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return (-1);
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cp += n;
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ShrinkBuffer(n);
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break;
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case T_MINFO:
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case T_SOA:
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case T_RP:
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for (i = 0; i < 2; i++) {
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if (!getword_str(buf2, sizeof buf2, &startp,
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endp))
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return (-1);
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n = dn_comp(buf2, cp, buflen,
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dnptrs, lastdnptr);
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if (n < 0)
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return (-1);
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cp += n;
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ShrinkBuffer(n);
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}
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if (rrecp->r_type == T_SOA) {
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ShrinkBuffer(5 * INT32SZ);
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while (isspace(*startp) || !*startp)
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startp++;
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if (*startp == '(') {
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multiline = 1;
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startp++;
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} else
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multiline = 0;
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/* serial, refresh, retry, expire, minimum */
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for (i = 0; i < 5; i++) {
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soanum = getnum_str(&startp, endp);
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if (soanum < 0)
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return (-1);
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PUTLONG(soanum, cp);
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}
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if (multiline) {
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while (isspace(*startp) || !*startp)
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startp++;
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if (*startp != ')')
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return (-1);
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}
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}
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break;
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case T_MX:
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case T_AFSDB:
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case T_RT:
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n = getnum_str(&startp, endp);
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if (n < 0)
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return (-1);
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ShrinkBuffer(INT16SZ);
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PUTSHORT(n, cp);
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if (!getword_str(buf2, sizeof buf2, &startp, endp))
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return (-1);
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n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
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if (n < 0)
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return (-1);
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cp += n;
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ShrinkBuffer(n);
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break;
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case T_SRV:
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n = getnum_str(&startp, endp);
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if (n < 0)
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return (-1);
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ShrinkBuffer(INT16SZ);
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PUTSHORT(n, cp);
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n = getnum_str(&startp, endp);
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if (n < 0)
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return (-1);
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ShrinkBuffer(INT16SZ);
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PUTSHORT(n, cp);
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n = getnum_str(&startp, endp);
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if (n < 0)
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return (-1);
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ShrinkBuffer(INT16SZ);
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PUTSHORT(n, cp);
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if (!getword_str(buf2, sizeof buf2, &startp, endp))
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return (-1);
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n = dn_comp(buf2, cp, buflen, NULL, NULL);
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if (n < 0)
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return (-1);
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cp += n;
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ShrinkBuffer(n);
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break;
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case T_PX:
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n = getnum_str(&startp, endp);
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if (n < 0)
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return (-1);
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PUTSHORT(n, cp);
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ShrinkBuffer(INT16SZ);
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for (i = 0; i < 2; i++) {
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if (!getword_str(buf2, sizeof buf2, &startp,
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endp))
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return (-1);
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n = dn_comp(buf2, cp, buflen, dnptrs,
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lastdnptr);
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if (n < 0)
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return (-1);
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cp += n;
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ShrinkBuffer(n);
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}
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break;
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case T_WKS: {
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char bm[MAXPORT/8];
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unsigned int maxbm = 0;
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if (!getword_str(buf2, sizeof buf2, &startp, endp))
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return (-1);
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if (!inet_aton(buf2, &ina))
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return (-1);
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n1 = ntohl(ina.s_addr);
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ShrinkBuffer(INT32SZ);
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PUTLONG(n1, cp);
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if (!getword_str(buf2, sizeof buf2, &startp, endp))
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return (-1);
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if ((i = res_protocolnumber(buf2)) < 0)
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return (-1);
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ShrinkBuffer(1);
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*cp++ = i & 0xff;
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for (i = 0; i < MAXPORT/8 ; i++)
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bm[i] = 0;
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while (getword_str(buf2, sizeof buf2, &startp, endp)) {
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if ((n = res_servicenumber(buf2)) <= 0)
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return (-1);
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if (n < MAXPORT) {
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bm[n/8] |= (0x80>>(n%8));
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if ((unsigned)n > maxbm)
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maxbm = n;
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} else
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return (-1);
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}
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maxbm = maxbm/8 + 1;
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ShrinkBuffer(maxbm);
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memcpy(cp, bm, maxbm);
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cp += maxbm;
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break;
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}
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case T_HINFO:
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for (i = 0; i < 2; i++) {
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if ((n = getstr_str(buf2, sizeof buf2,
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&startp, endp)) < 0)
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return (-1);
|
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if (n > 255)
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return (-1);
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ShrinkBuffer(n+1);
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*cp++ = n;
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memcpy(cp, buf2, n);
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cp += n;
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}
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break;
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case T_TXT:
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for (;;) {
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if ((n = getstr_str(buf2, sizeof buf2,
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&startp, endp)) < 0) {
|
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if (cp != (sp2 + INT16SZ))
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break;
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return (-1);
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|
}
|
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if (n > 255)
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return (-1);
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ShrinkBuffer(n+1);
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*cp++ = n;
|
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memcpy(cp, buf2, n);
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cp += n;
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}
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break;
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case T_X25:
|
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/* RFC1183 */
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if ((n = getstr_str(buf2, sizeof buf2, &startp,
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endp)) < 0)
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return (-1);
|
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if (n > 255)
|
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return (-1);
|
|
ShrinkBuffer(n+1);
|
|
*cp++ = n;
|
|
memcpy(cp, buf2, n);
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cp += n;
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break;
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|
case T_ISDN:
|
|
/* RFC1183 */
|
|
if ((n = getstr_str(buf2, sizeof buf2, &startp,
|
|
endp)) < 0)
|
|
return (-1);
|
|
if ((n > 255) || (n == 0))
|
|
return (-1);
|
|
ShrinkBuffer(n+1);
|
|
*cp++ = n;
|
|
memcpy(cp, buf2, n);
|
|
cp += n;
|
|
if ((n = getstr_str(buf2, sizeof buf2, &startp,
|
|
endp)) < 0)
|
|
n = 0;
|
|
if (n > 255)
|
|
return (-1);
|
|
ShrinkBuffer(n+1);
|
|
*cp++ = n;
|
|
memcpy(cp, buf2, n);
|
|
cp += n;
|
|
break;
|
|
case T_NSAP:
|
|
if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
|
|
ShrinkBuffer(n);
|
|
memcpy(cp, buf2, n);
|
|
cp += n;
|
|
} else {
|
|
return (-1);
|
|
}
|
|
break;
|
|
case T_LOC:
|
|
if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
|
|
ShrinkBuffer(n);
|
|
memcpy(cp, buf2, n);
|
|
cp += n;
|
|
} else
|
|
return (-1);
|
|
break;
|
|
case ns_t_sig:
|
|
#ifdef _LIBC
|
|
return (-1);
|
|
#else
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|
{
|
|
int sig_type, success, dateerror;
|
|
u_int32_t exptime, timesigned;
|
|
|
|
/* type */
|
|
if ((n = getword_str(buf2, sizeof buf2,
|
|
&startp, endp)) < 0)
|
|
return (-1);
|
|
sig_type = sym_ston(__p_type_syms, buf2, &success);
|
|
if (!success || sig_type == ns_t_any)
|
|
return (-1);
|
|
ShrinkBuffer(INT16SZ);
|
|
PUTSHORT(sig_type, cp);
|
|
/* alg */
|
|
n = getnum_str(&startp, endp);
|
|
if (n < 0)
|
|
return (-1);
|
|
ShrinkBuffer(1);
|
|
*cp++ = n;
|
|
/* labels */
|
|
n = getnum_str(&startp, endp);
|
|
if (n <= 0 || n > 255)
|
|
return (-1);
|
|
ShrinkBuffer(1);
|
|
*cp++ = n;
|
|
/* ottl & expire */
|
|
if (!getword_str(buf2, sizeof buf2, &startp, endp))
|
|
return (-1);
|
|
exptime = ns_datetosecs(buf2, &dateerror);
|
|
if (!dateerror) {
|
|
ShrinkBuffer(INT32SZ);
|
|
PUTLONG(rttl, cp);
|
|
}
|
|
else {
|
|
char *ulendp;
|
|
u_int32_t ottl;
|
|
|
|
errno = 0;
|
|
ottl = strtoul(buf2, &ulendp, 10);
|
|
if (errno != 0 ||
|
|
(ulendp != NULL && *ulendp != '\0'))
|
|
return (-1);
|
|
ShrinkBuffer(INT32SZ);
|
|
PUTLONG(ottl, cp);
|
|
if (!getword_str(buf2, sizeof buf2, &startp,
|
|
endp))
|
|
return (-1);
|
|
exptime = ns_datetosecs(buf2, &dateerror);
|
|
if (dateerror)
|
|
return (-1);
|
|
}
|
|
/* expire */
|
|
ShrinkBuffer(INT32SZ);
|
|
PUTLONG(exptime, cp);
|
|
/* timesigned */
|
|
if (!getword_str(buf2, sizeof buf2, &startp, endp))
|
|
return (-1);
|
|
timesigned = ns_datetosecs(buf2, &dateerror);
|
|
if (!dateerror) {
|
|
ShrinkBuffer(INT32SZ);
|
|
PUTLONG(timesigned, cp);
|
|
}
|
|
else
|
|
return (-1);
|
|
/* footprint */
|
|
n = getnum_str(&startp, endp);
|
|
if (n < 0)
|
|
return (-1);
|
|
ShrinkBuffer(INT16SZ);
|
|
PUTSHORT(n, cp);
|
|
/* signer name */
|
|
if (!getword_str(buf2, sizeof buf2, &startp, endp))
|
|
return (-1);
|
|
n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
|
|
if (n < 0)
|
|
return (-1);
|
|
cp += n;
|
|
ShrinkBuffer(n);
|
|
/* sig */
|
|
if ((n = getword_str(buf2, sizeof buf2,
|
|
&startp, endp)) < 0)
|
|
return (-1);
|
|
siglen = b64_pton(buf2, buf3, sizeof(buf3));
|
|
if (siglen < 0)
|
|
return (-1);
|
|
ShrinkBuffer(siglen);
|
|
memcpy(cp, buf3, siglen);
|
|
cp += siglen;
|
|
break;
|
|
}
|
|
#endif
|
|
case ns_t_key:
|
|
/* flags */
|
|
n = gethexnum_str(&startp, endp);
|
|
if (n < 0)
|
|
return (-1);
|
|
ShrinkBuffer(INT16SZ);
|
|
PUTSHORT(n, cp);
|
|
/* proto */
|
|
n = getnum_str(&startp, endp);
|
|
if (n < 0)
|
|
return (-1);
|
|
ShrinkBuffer(1);
|
|
*cp++ = n;
|
|
/* alg */
|
|
n = getnum_str(&startp, endp);
|
|
if (n < 0)
|
|
return (-1);
|
|
ShrinkBuffer(1);
|
|
*cp++ = n;
|
|
/* key */
|
|
if ((n = getword_str(buf2, sizeof buf2,
|
|
&startp, endp)) < 0)
|
|
return (-1);
|
|
keylen = b64_pton(buf2, buf3, sizeof(buf3));
|
|
if (keylen < 0)
|
|
return (-1);
|
|
ShrinkBuffer(keylen);
|
|
memcpy(cp, buf3, keylen);
|
|
cp += keylen;
|
|
break;
|
|
case ns_t_nxt:
|
|
{
|
|
int success, nxt_type;
|
|
u_char data[32];
|
|
int maxtype;
|
|
|
|
/* next name */
|
|
if (!getword_str(buf2, sizeof buf2, &startp, endp))
|
|
return (-1);
|
|
n = dn_comp(buf2, cp, buflen, NULL, NULL);
|
|
if (n < 0)
|
|
return (-1);
|
|
cp += n;
|
|
ShrinkBuffer(n);
|
|
maxtype = 0;
|
|
memset(data, 0, sizeof data);
|
|
for (;;) {
|
|
if (!getword_str(buf2, sizeof buf2, &startp,
|
|
endp))
|
|
break;
|
|
nxt_type = sym_ston(__p_type_syms, buf2,
|
|
&success);
|
|
if (!success || !ns_t_rr_p(nxt_type))
|
|
return (-1);
|
|
NS_NXT_BIT_SET(nxt_type, data);
|
|
if (nxt_type > maxtype)
|
|
maxtype = nxt_type;
|
|
}
|
|
n = maxtype/NS_NXT_BITS+1;
|
|
ShrinkBuffer(n);
|
|
memcpy(cp, data, n);
|
|
cp += n;
|
|
break;
|
|
}
|
|
case ns_t_cert:
|
|
/* type */
|
|
n = getnum_str(&startp, endp);
|
|
if (n < 0)
|
|
return (-1);
|
|
ShrinkBuffer(INT16SZ);
|
|
PUTSHORT(n, cp);
|
|
/* key tag */
|
|
n = getnum_str(&startp, endp);
|
|
if (n < 0)
|
|
return (-1);
|
|
ShrinkBuffer(INT16SZ);
|
|
PUTSHORT(n, cp);
|
|
/* alg */
|
|
n = getnum_str(&startp, endp);
|
|
if (n < 0)
|
|
return (-1);
|
|
ShrinkBuffer(1);
|
|
*cp++ = n;
|
|
/* cert */
|
|
if ((n = getword_str(buf2, sizeof buf2,
|
|
&startp, endp)) < 0)
|
|
return (-1);
|
|
certlen = b64_pton(buf2, buf3, sizeof(buf3));
|
|
if (certlen < 0)
|
|
return (-1);
|
|
ShrinkBuffer(certlen);
|
|
memcpy(cp, buf3, certlen);
|
|
cp += certlen;
|
|
break;
|
|
case ns_t_aaaa:
|
|
if (!getword_str(buf2, sizeof buf2, &startp, endp))
|
|
return (-1);
|
|
if (inet_pton(AF_INET6, buf2, &in6a) <= 0)
|
|
return (-1);
|
|
ShrinkBuffer(NS_IN6ADDRSZ);
|
|
memcpy(cp, &in6a, NS_IN6ADDRSZ);
|
|
cp += NS_IN6ADDRSZ;
|
|
break;
|
|
case ns_t_naptr:
|
|
/* Order Preference Flags Service Replacement Regexp */
|
|
/* Order */
|
|
n = getnum_str(&startp, endp);
|
|
if (n < 0 || n > 65535)
|
|
return (-1);
|
|
ShrinkBuffer(INT16SZ);
|
|
PUTSHORT(n, cp);
|
|
/* Preference */
|
|
n = getnum_str(&startp, endp);
|
|
if (n < 0 || n > 65535)
|
|
return (-1);
|
|
ShrinkBuffer(INT16SZ);
|
|
PUTSHORT(n, cp);
|
|
/* Flags */
|
|
if ((n = getstr_str(buf2, sizeof buf2,
|
|
&startp, endp)) < 0) {
|
|
return (-1);
|
|
}
|
|
if (n > 255)
|
|
return (-1);
|
|
ShrinkBuffer(n+1);
|
|
*cp++ = n;
|
|
memcpy(cp, buf2, n);
|
|
cp += n;
|
|
/* Service Classes */
|
|
if ((n = getstr_str(buf2, sizeof buf2,
|
|
&startp, endp)) < 0) {
|
|
return (-1);
|
|
}
|
|
if (n > 255)
|
|
return (-1);
|
|
ShrinkBuffer(n+1);
|
|
*cp++ = n;
|
|
memcpy(cp, buf2, n);
|
|
cp += n;
|
|
/* Pattern */
|
|
if ((n = getstr_str(buf2, sizeof buf2,
|
|
&startp, endp)) < 0) {
|
|
return (-1);
|
|
}
|
|
if (n > 255)
|
|
return (-1);
|
|
ShrinkBuffer(n+1);
|
|
*cp++ = n;
|
|
memcpy(cp, buf2, n);
|
|
cp += n;
|
|
/* Replacement */
|
|
if (!getword_str(buf2, sizeof buf2, &startp, endp))
|
|
return (-1);
|
|
n = dn_comp(buf2, cp, buflen, NULL, NULL);
|
|
if (n < 0)
|
|
return (-1);
|
|
cp += n;
|
|
ShrinkBuffer(n);
|
|
break;
|
|
default:
|
|
return (-1);
|
|
} /*switch*/
|
|
n = (u_int16_t)((cp - sp2) - INT16SZ);
|
|
PUTSHORT(n, sp2);
|
|
} /*for*/
|
|
|
|
hp->qdcount = htons(counts[0]);
|
|
hp->ancount = htons(counts[1]);
|
|
hp->nscount = htons(counts[2]);
|
|
hp->arcount = htons(counts[3]);
|
|
return (cp - buf);
|
|
}
|
|
|
|
/*%
|
|
* 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, u_char **startpp, u_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);
|
|
}
|
|
|
|
/*%
|
|
* get a white spae delimited string from memory. Process quoted strings
|
|
* and \\DDD escapes. Return length or -1 on error. Returned string may
|
|
* contain nulls.
|
|
*/
|
|
static char digits[] = "0123456789";
|
|
static int
|
|
getstr_str(char *buf, int size, u_char **startpp, u_char *endp) {
|
|
char *cp;
|
|
int c, c1 = 0;
|
|
int inquote = 0;
|
|
int seen_quote = 0;
|
|
int escape = 0;
|
|
int dig = 0;
|
|
|
|
for (cp = buf; *startpp <= endp; ) {
|
|
if ((c = **startpp) == '\0')
|
|
break;
|
|
/* leading white space */
|
|
if ((cp == buf) && !seen_quote && isspace(c)) {
|
|
(*startpp)++;
|
|
continue;
|
|
}
|
|
|
|
switch (c) {
|
|
case '\\':
|
|
if (!escape) {
|
|
escape = 1;
|
|
dig = 0;
|
|
c1 = 0;
|
|
(*startpp)++;
|
|
continue;
|
|
}
|
|
goto do_escape;
|
|
case '"':
|
|
if (!escape) {
|
|
inquote = !inquote;
|
|
seen_quote = 1;
|
|
(*startpp)++;
|
|
continue;
|
|
}
|
|
/* fall through */
|
|
default:
|
|
do_escape:
|
|
if (escape) {
|
|
switch (c) {
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
case '8':
|
|
case '9':
|
|
c1 = c1 * 10 +
|
|
(strchr(digits, c) - digits);
|
|
|
|
if (++dig == 3) {
|
|
c = c1 &0xff;
|
|
break;
|
|
}
|
|
(*startpp)++;
|
|
continue;
|
|
}
|
|
escape = 0;
|
|
} else if (!inquote && isspace(c))
|
|
goto done;
|
|
if (cp >= buf+size-1)
|
|
goto done;
|
|
*cp++ = (u_char)c;
|
|
(*startpp)++;
|
|
}
|
|
}
|
|
done:
|
|
*cp = '\0';
|
|
return ((cp == buf)? (seen_quote? 0: -1): (cp - buf));
|
|
}
|
|
|
|
/*%
|
|
* Get a whitespace delimited base 16 number from a string (not file) into buf
|
|
* update the start pointer to point after the number in the string.
|
|
*/
|
|
static int
|
|
gethexnum_str(u_char **startpp, u_char *endp) {
|
|
int c, n;
|
|
int seendigit = 0;
|
|
int m = 0;
|
|
|
|
if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0)
|
|
return getnum_str(startpp, endp);
|
|
(*startpp)+=2;
|
|
for (n = 0; *startpp <= endp; ) {
|
|
c = **startpp;
|
|
if (isspace(c) || c == '\0') {
|
|
if (seendigit) /*%< trailing whitespace */
|
|
break;
|
|
else { /*%< leading whitespace */
|
|
(*startpp)++;
|
|
continue;
|
|
}
|
|
}
|
|
if (c == ';') {
|
|
while ((*startpp <= endp) &&
|
|
((c = **startpp) != '\n'))
|
|
(*startpp)++;
|
|
if (seendigit)
|
|
break;
|
|
continue;
|
|
}
|
|
if (!isxdigit(c)) {
|
|
if (c == ')' && seendigit) {
|
|
(*startpp)--;
|
|
break;
|
|
}
|
|
return (-1);
|
|
}
|
|
(*startpp)++;
|
|
if (isdigit(c))
|
|
n = n * 16 + (c - '0');
|
|
else
|
|
n = n * 16 + (tolower(c) - 'a' + 10);
|
|
seendigit = 1;
|
|
}
|
|
return (n + m);
|
|
}
|
|
|
|
/*%
|
|
* Get a whitespace delimited base 10 number from a string (not file) into buf
|
|
* update the start pointer to point after the number in the string.
|
|
*/
|
|
static int
|
|
getnum_str(u_char **startpp, u_char *endp) {
|
|
int c, n;
|
|
int seendigit = 0;
|
|
int m = 0;
|
|
|
|
for (n = 0; *startpp <= endp; ) {
|
|
c = **startpp;
|
|
if (isspace(c) || c == '\0') {
|
|
if (seendigit) /*%< trailing whitespace */
|
|
break;
|
|
else { /*%< leading whitespace */
|
|
(*startpp)++;
|
|
continue;
|
|
}
|
|
}
|
|
if (c == ';') {
|
|
while ((*startpp <= endp) &&
|
|
((c = **startpp) != '\n'))
|
|
(*startpp)++;
|
|
if (seendigit)
|
|
break;
|
|
continue;
|
|
}
|
|
if (!isdigit(c)) {
|
|
if (c == ')' && seendigit) {
|
|
(*startpp)--;
|
|
break;
|
|
}
|
|
return (-1);
|
|
}
|
|
(*startpp)++;
|
|
n = n * 10 + (c - '0');
|
|
seendigit = 1;
|
|
}
|
|
return (n + m);
|
|
}
|
|
|
|
/*%
|
|
* Allocate a resource record buffer & save rr info.
|
|
*/
|
|
ns_updrec *
|
|
res_mkupdrec(int section, const char *dname,
|
|
u_int class, u_int type, u_long ttl) {
|
|
ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
|
|
|
|
if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
|
|
if (rrecp)
|
|
free((char *)rrecp);
|
|
return (NULL);
|
|
}
|
|
INIT_LINK(rrecp, r_link);
|
|
INIT_LINK(rrecp, r_glink);
|
|
rrecp->r_class = (ns_class)class;
|
|
rrecp->r_type = (ns_type)type;
|
|
rrecp->r_ttl = ttl;
|
|
rrecp->r_section = (ns_sect)section;
|
|
return (rrecp);
|
|
}
|
|
|
|
/*%
|
|
* Free a resource record buffer created by res_mkupdrec.
|
|
*/
|
|
void
|
|
res_freeupdrec(ns_updrec *rrecp) {
|
|
/* Note: freeing r_dp is the caller's responsibility. */
|
|
if (rrecp->r_dname != NULL)
|
|
free(rrecp->r_dname);
|
|
free(rrecp);
|
|
}
|
|
|
|
struct valuelist {
|
|
struct valuelist * next;
|
|
struct valuelist * prev;
|
|
char * name;
|
|
char * proto;
|
|
int port;
|
|
};
|
|
static struct valuelist *servicelist, *protolist;
|
|
|
|
static void
|
|
res_buildservicelist() {
|
|
struct servent *sp;
|
|
struct valuelist *slp;
|
|
|
|
#ifdef MAYBE_HESIOD
|
|
setservent(0);
|
|
#else
|
|
setservent(1);
|
|
#endif
|
|
while ((sp = getservent()) != NULL) {
|
|
slp = (struct valuelist *)malloc(sizeof(struct valuelist));
|
|
if (!slp)
|
|
break;
|
|
slp->name = strdup(sp->s_name);
|
|
slp->proto = strdup(sp->s_proto);
|
|
if ((slp->name == NULL) || (slp->proto == NULL)) {
|
|
if (slp->name) free(slp->name);
|
|
if (slp->proto) free(slp->proto);
|
|
free(slp);
|
|
break;
|
|
}
|
|
slp->port = ntohs((u_int16_t)sp->s_port); /*%< host byt order */
|
|
slp->next = servicelist;
|
|
slp->prev = NULL;
|
|
if (servicelist)
|
|
servicelist->prev = slp;
|
|
servicelist = slp;
|
|
}
|
|
endservent();
|
|
}
|
|
|
|
#ifndef _LIBC
|
|
void
|
|
res_destroyservicelist() {
|
|
struct valuelist *slp, *slp_next;
|
|
|
|
for (slp = servicelist; slp != NULL; slp = slp_next) {
|
|
slp_next = slp->next;
|
|
free(slp->name);
|
|
free(slp->proto);
|
|
free(slp);
|
|
}
|
|
servicelist = (struct valuelist *)0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef _LIBC
|
|
static
|
|
#endif
|
|
void
|
|
res_buildprotolist(void) {
|
|
struct protoent *pp;
|
|
struct valuelist *slp;
|
|
|
|
#ifdef MAYBE_HESIOD
|
|
setprotoent(0);
|
|
#else
|
|
setprotoent(1);
|
|
#endif
|
|
while ((pp = getprotoent()) != NULL) {
|
|
slp = (struct valuelist *)malloc(sizeof(struct valuelist));
|
|
if (!slp)
|
|
break;
|
|
slp->name = strdup(pp->p_name);
|
|
if (slp->name == NULL) {
|
|
free(slp);
|
|
break;
|
|
}
|
|
slp->port = pp->p_proto; /*%< host byte order */
|
|
slp->next = protolist;
|
|
slp->prev = NULL;
|
|
if (protolist)
|
|
protolist->prev = slp;
|
|
protolist = slp;
|
|
}
|
|
endprotoent();
|
|
}
|
|
|
|
#ifndef _LIBC
|
|
void
|
|
res_destroyprotolist(void) {
|
|
struct valuelist *plp, *plp_next;
|
|
|
|
for (plp = protolist; plp != NULL; plp = plp_next) {
|
|
plp_next = plp->next;
|
|
free(plp->name);
|
|
free(plp);
|
|
}
|
|
protolist = (struct valuelist *)0;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
findservice(const char *s, struct valuelist **list) {
|
|
struct valuelist *lp = *list;
|
|
int n;
|
|
|
|
for (; lp != NULL; lp = lp->next)
|
|
if (strcasecmp(lp->name, s) == 0) {
|
|
if (lp != *list) {
|
|
lp->prev->next = lp->next;
|
|
if (lp->next)
|
|
lp->next->prev = lp->prev;
|
|
(*list)->prev = lp;
|
|
lp->next = *list;
|
|
*list = lp;
|
|
}
|
|
return (lp->port); /*%< host byte order */
|
|
}
|
|
if (sscanf(s, "%d", &n) != 1 || n <= 0)
|
|
n = -1;
|
|
return (n);
|
|
}
|
|
|
|
/*%
|
|
* Convert service name or (ascii) number to int.
|
|
*/
|
|
#ifdef _LIBC
|
|
static
|
|
#endif
|
|
int
|
|
res_servicenumber(const char *p) {
|
|
if (servicelist == (struct valuelist *)0)
|
|
res_buildservicelist();
|
|
return (findservice(p, &servicelist));
|
|
}
|
|
|
|
/*%
|
|
* Convert protocol name or (ascii) number to int.
|
|
*/
|
|
#ifdef _LIBC
|
|
static
|
|
#endif
|
|
int
|
|
res_protocolnumber(const char *p) {
|
|
if (protolist == (struct valuelist *)0)
|
|
res_buildprotolist();
|
|
return (findservice(p, &protolist));
|
|
}
|
|
|
|
#ifndef _LIBC
|
|
static struct servent *
|
|
cgetservbyport(u_int16_t port, const char *proto) { /*%< Host byte order. */
|
|
struct valuelist **list = &servicelist;
|
|
struct valuelist *lp = *list;
|
|
static struct servent serv;
|
|
|
|
port = ntohs(port);
|
|
for (; lp != NULL; lp = lp->next) {
|
|
if (port != (u_int16_t)lp->port) /*%< Host byte order. */
|
|
continue;
|
|
if (strcasecmp(lp->proto, proto) == 0) {
|
|
if (lp != *list) {
|
|
lp->prev->next = lp->next;
|
|
if (lp->next)
|
|
lp->next->prev = lp->prev;
|
|
(*list)->prev = lp;
|
|
lp->next = *list;
|
|
*list = lp;
|
|
}
|
|
serv.s_name = lp->name;
|
|
serv.s_port = htons((u_int16_t)lp->port);
|
|
serv.s_proto = lp->proto;
|
|
return (&serv);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static struct protoent *
|
|
cgetprotobynumber(int proto) { /*%< Host byte order. */
|
|
struct valuelist **list = &protolist;
|
|
struct valuelist *lp = *list;
|
|
static struct protoent prot;
|
|
|
|
for (; lp != NULL; lp = lp->next)
|
|
if (lp->port == proto) { /*%< Host byte order. */
|
|
if (lp != *list) {
|
|
lp->prev->next = lp->next;
|
|
if (lp->next)
|
|
lp->next->prev = lp->prev;
|
|
(*list)->prev = lp;
|
|
lp->next = *list;
|
|
*list = lp;
|
|
}
|
|
prot.p_name = lp->name;
|
|
prot.p_proto = lp->port; /*%< Host byte order. */
|
|
return (&prot);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
const char *
|
|
res_protocolname(int num) {
|
|
static char number[8];
|
|
struct protoent *pp;
|
|
|
|
if (protolist == (struct valuelist *)0)
|
|
res_buildprotolist();
|
|
pp = cgetprotobynumber(num);
|
|
if (pp == 0) {
|
|
(void) sprintf(number, "%d", num);
|
|
return (number);
|
|
}
|
|
return (pp->p_name);
|
|
}
|
|
|
|
const char *
|
|
res_servicename(u_int16_t port, const char *proto) { /*%< Host byte order. */
|
|
static char number[8];
|
|
struct servent *ss;
|
|
|
|
if (servicelist == (struct valuelist *)0)
|
|
res_buildservicelist();
|
|
ss = cgetservbyport(htons(port), proto);
|
|
if (ss == 0) {
|
|
(void) sprintf(number, "%d", port);
|
|
return (number);
|
|
}
|
|
return (ss->s_name);
|
|
}
|
|
#endif
|