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glibc/resolv/res_debug.c
Florian Weimer aef16cc8a4 resolv: Automatically reload a changed /etc/resolv.conf file [BZ #984] 
This commit enhances the stub resolver to reload the configuration
in the per-thread _res object if the /etc/resolv.conf file has
changed.  The resolver checks whether the application has modified
_res and will not overwrite the _res object in that case.

The struct resolv_context mechanism is used to check the
configuration file only once per name lookup.
2017-07-03 21:06:23 +02:00

1075 lines
29 KiB
C
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/*
* Copyright (c) 1985
* 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.
* 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.
*/
/*
* Portions Copyright (c) 1995 by International Business Machines, Inc.
*
* International Business Machines, Inc. (hereinafter called IBM) grants
* permission under its copyrights to use, copy, modify, and distribute this
* Software with or without fee, provided that the above copyright notice and
* all paragraphs of this notice appear in all copies, and that the name of IBM
* not be used in connection with the marketing of any product incorporating
* the Software or modifications thereof, without specific, written prior
* permission.
*
* To the extent it has a right to do so, IBM grants an immunity from suit
* under its patents, if any, for the use, sale or manufacture of products to
* the extent that such products are used for performing Domain Name System
* dynamic updates in TCP/IP networks by means of the Software. No immunity is
* granted for any product per se or for any other function of any product.
*
* THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE. IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL,
* DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN
* IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.
*/
/*
* Portions Copyright (c) 1996-1999 by Internet Software Consortium.
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM 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.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <ctype.h>
#include <errno.h>
#include <math.h>
#include <netdb.h>
#include <resolv/resolv-internal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <shlib-compat.h>
#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) sprintf x
#endif
extern const char *_res_sectioncodes[] attribute_hidden;
/* _res_opcodes was exported by accident as a variable. */
#if SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_26)
static const char *res_opcodes[] =
#else
static const char res_opcodes[][9] =
#endif
{
"QUERY",
"IQUERY",
"CQUERYM",
"CQUERYU", /* experimental */
"NOTIFY", /* experimental */
"UPDATE",
"6",
"7",
"8",
"9",
"10",
"11",
"12",
"13",
"ZONEINIT",
"ZONEREF",
};
#if SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_26)
strong_alias (res_opcodes, _res_opcodes)
#endif
static const char *p_section(int section, int opcode);
/*
* Print the current options.
*/
void
fp_resstat(const res_state statp, FILE *file) {
u_long mask;
fprintf(file, ";; res options:");
for (mask = 1; mask != 0; mask <<= 1)
if (statp->options & mask)
fprintf(file, " %s", p_option(mask));
putc('\n', file);
}
static void
do_section (int pfcode, ns_msg *handle, ns_sect section, int pflag, FILE *file)
{
int n, sflag, rrnum;
static int buflen = 2048;
char *buf;
ns_opcode opcode;
ns_rr rr;
/*
* Print answer records.
*/
sflag = (pfcode & pflag);
if (pfcode && !sflag)
return;
buf = malloc(buflen);
if (buf == NULL) {
fprintf(file, ";; memory allocation failure\n");
return;
}
opcode = (ns_opcode) ns_msg_getflag(*handle, ns_f_opcode);
rrnum = 0;
for (;;) {
if (ns_parserr(handle, section, rrnum, &rr)) {
if (errno != ENODEV)
fprintf(file, ";; ns_parserr: %s\n",
strerror(errno));
else if (rrnum > 0 && sflag != 0 &&
(pfcode & RES_PRF_HEAD1))
putc('\n', file);
goto cleanup;
}
if (rrnum == 0 && sflag != 0 && (pfcode & RES_PRF_HEAD1))
fprintf(file, ";; %s SECTION:\n",
p_section(section, opcode));
if (section == ns_s_qd)
fprintf(file, ";;\t%s, type = %s, class = %s\n",
ns_rr_name(rr),
p_type(ns_rr_type(rr)),
p_class(ns_rr_class(rr)));
else {
n = ns_sprintrr(handle, &rr, NULL, NULL,
buf, buflen);
if (n < 0) {
if (errno == ENOSPC) {
free(buf);
buf = NULL;
if (buflen < 131072)
buf = malloc(buflen += 1024);
if (buf == NULL) {
fprintf(file,
";; memory allocation failure\n");
return;
}
continue;
}
fprintf(file, ";; ns_sprintrr: %s\n",
strerror(errno));
goto cleanup;
}
fputs(buf, file);
fputc('\n', file);
}
rrnum++;
}
cleanup:
free(buf);
}
/*
* Print the contents of a query.
* This is intended to be primarily a debugging routine.
*/
void
fp_nquery (const unsigned char *msg, int len, FILE *file)
{
ns_msg handle;
int qdcount, ancount, nscount, arcount;
u_int opcode, rcode, id;
/* There is no need to initialize _res: If _res is not yet
initialized, _res.pfcode is zero. But initialization will
leave it at zero, too. _res.pfcode is an unsigned long,
but the code here assumes that the flags fit into an int,
so use that. */
int pfcode = _res.pfcode;
if (ns_initparse(msg, len, &handle) < 0) {
fprintf(file, ";; ns_initparse: %s\n", strerror(errno));
return;
}
opcode = ns_msg_getflag(handle, ns_f_opcode);
rcode = ns_msg_getflag(handle, ns_f_rcode);
id = ns_msg_id(handle);
qdcount = ns_msg_count(handle, ns_s_qd);
ancount = ns_msg_count(handle, ns_s_an);
nscount = ns_msg_count(handle, ns_s_ns);
arcount = ns_msg_count(handle, ns_s_ar);
/*
* Print header fields.
*/
if ((!pfcode) || (pfcode & RES_PRF_HEADX) || rcode)
fprintf(file,
";; ->>HEADER<<- opcode: %s, status: %s, id: %d\n",
res_opcodes[opcode], p_rcode(rcode), id);
if ((!pfcode) || (pfcode & RES_PRF_HEADX))
putc(';', file);
if ((!pfcode) || (pfcode & RES_PRF_HEAD2)) {
fprintf(file, "; flags:");
if (ns_msg_getflag(handle, ns_f_qr))
fprintf(file, " qr");
if (ns_msg_getflag(handle, ns_f_aa))
fprintf(file, " aa");
if (ns_msg_getflag(handle, ns_f_tc))
fprintf(file, " tc");
if (ns_msg_getflag(handle, ns_f_rd))
fprintf(file, " rd");
if (ns_msg_getflag(handle, ns_f_ra))
fprintf(file, " ra");
if (ns_msg_getflag(handle, ns_f_z))
fprintf(file, " ??");
if (ns_msg_getflag(handle, ns_f_ad))
fprintf(file, " ad");
if (ns_msg_getflag(handle, ns_f_cd))
fprintf(file, " cd");
}
if ((!pfcode) || (pfcode & RES_PRF_HEAD1)) {
fprintf(file, "; %s: %d",
p_section(ns_s_qd, opcode), qdcount);
fprintf(file, ", %s: %d",
p_section(ns_s_an, opcode), ancount);
fprintf(file, ", %s: %d",
p_section(ns_s_ns, opcode), nscount);
fprintf(file, ", %s: %d",
p_section(ns_s_ar, opcode), arcount);
}
if ((!pfcode) || (pfcode &
(RES_PRF_HEADX | RES_PRF_HEAD2 | RES_PRF_HEAD1))) {
putc('\n',file);
}
/*
* Print the various sections.
*/
do_section (pfcode, &handle, ns_s_qd, RES_PRF_QUES, file);
do_section (pfcode, &handle, ns_s_an, RES_PRF_ANS, file);
do_section (pfcode, &handle, ns_s_ns, RES_PRF_AUTH, file);
do_section (pfcode, &handle, ns_s_ar, RES_PRF_ADD, file);
if (qdcount == 0 && ancount == 0 &&
nscount == 0 && arcount == 0)
putc('\n', file);
}
libresolv_hidden_def (fp_nquery)
void
fp_query (const unsigned char *msg, FILE *file)
{
fp_nquery (msg, PACKETSZ, file);
}
libresolv_hidden_def (fp_query)
void
p_query (const unsigned char *msg)
{
fp_query (msg, stdout);
}
const u_char *
p_cdnname(const u_char *cp, const u_char *msg, int len, FILE *file) {
char name[MAXDNAME];
int n;
if ((n = dn_expand(msg, msg + len, cp, name, sizeof name)) < 0)
return (NULL);
if (name[0] == '\0')
putc('.', file);
else
fputs(name, file);
return (cp + n);
}
libresolv_hidden_def (p_cdnname)
const u_char *
p_cdname(const u_char *cp, const u_char *msg, FILE *file) {
return (p_cdnname(cp, msg, PACKETSZ, file));
}
/* Return a fully-qualified domain name from a compressed name (with
length supplied). */
const u_char *
p_fqnname (const u_char *cp, const u_char *msg, int msglen, char *name,
int namelen)
{
int n, newlen;
if ((n = dn_expand(msg, cp + msglen, cp, name, namelen)) < 0)
return (NULL);
newlen = strlen(name);
if (newlen == 0 || name[newlen - 1] != '.') {
if (newlen + 1 >= namelen) /* Lack space for final dot */
return (NULL);
else
strcpy(name + newlen, ".");
}
return (cp + n);
}
libresolv_hidden_def (p_fqnname)
/* XXX: the rest of these functions need to become length-limited, too. */
const u_char *
p_fqname(const u_char *cp, const u_char *msg, FILE *file) {
char name[MAXDNAME];
const u_char *n;
n = p_fqnname(cp, msg, MAXCDNAME, name, sizeof name);
if (n == NULL)
return (NULL);
fputs(name, file);
return (n);
}
/*
* Names of RR classes and qclasses. Classes and qclasses are the same, except
* that C_ANY is a qclass but not a class. (You can ask for records of class
* C_ANY, but you can't have any records of that class in the database.)
*/
extern const struct res_sym __p_class_syms[];
libresolv_hidden_proto (__p_class_syms)
const struct res_sym __p_class_syms[] = {
{C_IN, (char *) "IN"},
{C_CHAOS, (char *) "CHAOS"},
{C_HS, (char *) "HS"},
{C_HS, (char *) "HESIOD"},
{C_ANY, (char *) "ANY"},
{C_NONE, (char *) "NONE"},
{C_IN, NULL, NULL}
};
libresolv_hidden_data_def (__p_class_syms)
/*
* Names of message sections.
*/
const struct res_sym __p_default_section_syms[] attribute_hidden = {
{ns_s_qd, (char *) "QUERY"},
{ns_s_an, (char *) "ANSWER"},
{ns_s_ns, (char *) "AUTHORITY"},
{ns_s_ar, (char *) "ADDITIONAL"},
{0, NULL, NULL}
};
const struct res_sym __p_update_section_syms[] attribute_hidden = {
{S_ZONE, (char *) "ZONE"},
{S_PREREQ, (char *) "PREREQUISITE"},
{S_UPDATE, (char *) "UPDATE"},
{S_ADDT, (char *) "ADDITIONAL"},
{0, NULL, NULL}
};
/*
* Names of RR types and qtypes. The list is incomplete because its
* size is part of the ABI.
*/
extern const struct res_sym __p_type_syms[];
libresolv_hidden_proto (__p_type_syms)
const struct res_sym __p_type_syms[] = {
{ns_t_a, (char *) "A", (char *) "address"},
{ns_t_ns, (char *) "NS", (char *) "name server"},
{ns_t_md, (char *) "MD", (char *) "mail destination (deprecated)"},
{ns_t_mf, (char *) "MF", (char *) "mail forwarder (deprecated)"},
{ns_t_cname, (char *) "CNAME", (char *) "canonical name"},
{ns_t_soa, (char *) "SOA", (char *) "start of authority"},
{ns_t_mb, (char *) "MB", (char *) "mailbox"},
{ns_t_mg, (char *) "MG", (char *) "mail group member"},
{ns_t_mr, (char *) "MR", (char *) "mail rename"},
{ns_t_null, (char *) "NULL", (char *) "null"},
{ns_t_wks, (char *) "WKS", (char *) "well-known service (deprecated)"},
{ns_t_ptr, (char *) "PTR", (char *) "domain name pointer"},
{ns_t_hinfo, (char *) "HINFO", (char *) "host information"},
{ns_t_minfo, (char *) "MINFO", (char *) "mailbox information"},
{ns_t_mx, (char *) "MX", (char *) "mail exchanger"},
{ns_t_txt, (char *) "TXT", (char *) "text"},
{ns_t_rp, (char *) "RP", (char *) "responsible person"},
{ns_t_afsdb, (char *) "AFSDB", (char *) "DCE or AFS server"},
{ns_t_x25, (char *) "X25", (char *) "X25 address"},
{ns_t_isdn, (char *) "ISDN", (char *) "ISDN address"},
{ns_t_rt, (char *) "RT", (char *) "router"},
{ns_t_nsap, (char *) "NSAP", (char *) "nsap address"},
{ns_t_nsap_ptr, (char *) "NSAP_PTR", (char *) "domain name pointer"},
{ns_t_sig, (char *) "SIG", (char *) "signature"},
{ns_t_key, (char *) "KEY", (char *) "key"},
{ns_t_px, (char *) "PX", (char *) "mapping information"},
{ns_t_gpos, (char *) "GPOS",
(char *) "geographical position (withdrawn)"},
{ns_t_aaaa, (char *) "AAAA", (char *) "IPv6 address"},
{ns_t_loc, (char *) "LOC", (char *) "location"},
{ns_t_nxt, (char *) "NXT", (char *) "next valid name (unimplemented)"},
{ns_t_eid, (char *) "EID", (char *) "endpoint identifier (unimplemented)"},
{ns_t_nimloc, (char *) "NIMLOC", (char *) "NIMROD locator (unimplemented)"},
{ns_t_srv, (char *) "SRV", (char *) "server selection"},
{ns_t_atma, (char *) "ATMA", (char *) "ATM address (unimplemented)"},
{ns_t_dname, (char *) "DNAME", (char *) "Non-terminal DNAME (for IPv6)"},
{ns_t_tsig, (char *) "TSIG", (char *) "transaction signature"},
{ns_t_ixfr, (char *) "IXFR", (char *) "incremental zone transfer"},
{ns_t_axfr, (char *) "AXFR", (char *) "zone transfer"},
{ns_t_mailb, (char *) "MAILB", (char *) "mailbox-related data (deprecated)"},
{ns_t_maila, (char *) "MAILA", (char *) "mail agent (deprecated)"},
{ns_t_naptr, (char *) "NAPTR", (char *) "URN Naming Authority"},
{ns_t_kx, (char *) "KX", (char *) "Key Exchange"},
{ns_t_cert, (char *) "CERT", (char *) "Certificate"},
{ns_t_any, (char *) "ANY", (char *) "\"any\""},
{0, NULL, NULL}, /* Padding to preserve ABI. */
{0, NULL, NULL}
};
libresolv_hidden_data_def (__p_type_syms)
/*
* Names of DNS rcodes.
*/
const struct res_sym __p_rcode_syms[] attribute_hidden = {
{ns_r_noerror, (char *) "NOERROR", (char *) "no error"},
{ns_r_formerr, (char *) "FORMERR", (char *) "format error"},
{ns_r_servfail, (char *) "SERVFAIL", (char *) "server failed"},
{ns_r_nxdomain, (char *) "NXDOMAIN", (char *) "no such domain name"},
{ns_r_notimpl, (char *) "NOTIMP", (char *) "not implemented"},
{ns_r_refused, (char *) "REFUSED", (char *) "refused"},
{ns_r_yxdomain, (char *) "YXDOMAIN", (char *) "domain name exists"},
{ns_r_yxrrset, (char *) "YXRRSET", (char *) "rrset exists"},
{ns_r_nxrrset, (char *) "NXRRSET", (char *) "rrset doesn't exist"},
{ns_r_notauth, (char *) "NOTAUTH", (char *) "not authoritative"},
{ns_r_notzone, (char *) "NOTZONE", (char *) "Not in zone"},
{ns_r_max, (char *) "", (char *) ""},
{ns_r_badsig, (char *) "BADSIG", (char *) "bad signature"},
{ns_r_badkey, (char *) "BADKEY", (char *) "bad key"},
{ns_r_badtime, (char *) "BADTIME", (char *) "bad time"},
{0, NULL, NULL}
};
int
sym_ston(const struct res_sym *syms, const char *name, int *success) {
for ((void)NULL; syms->name != 0; syms++) {
if (strcasecmp (name, syms->name) == 0) {
if (success)
*success = 1;
return (syms->number);
}
}
if (success)
*success = 0;
return (syms->number); /* The default value. */
}
const char *
sym_ntos(const struct res_sym *syms, int number, int *success) {
static char unname[20];
for ((void)NULL; syms->name != 0; syms++) {
if (number == syms->number) {
if (success)
*success = 1;
return (syms->name);
}
}
sprintf(unname, "%d", number); /* XXX nonreentrant */
if (success)
*success = 0;
return (unname);
}
libresolv_hidden_def (sym_ntos)
const char *
sym_ntop(const struct res_sym *syms, int number, int *success) {
static char unname[20];
for ((void)NULL; syms->name != 0; syms++) {
if (number == syms->number) {
if (success)
*success = 1;
return (syms->humanname);
}
}
sprintf(unname, "%d", number); /* XXX nonreentrant */
if (success)
*success = 0;
return (unname);
}
/*
* Return a string for the type.
*/
const char *
p_type(int type) {
return (sym_ntos(__p_type_syms, type, (int *)0));
}
libresolv_hidden_def (p_type)
/*
* Return a string for the type.
*/
static const char *
p_section(int section, int opcode) {
const struct res_sym *symbols;
switch (opcode) {
case ns_o_update:
symbols = __p_update_section_syms;
break;
default:
symbols = __p_default_section_syms;
break;
}
return (sym_ntos(symbols, section, (int *)0));
}
/*
* Return a mnemonic for class.
*/
const char *
p_class(int class) {
return (sym_ntos(__p_class_syms, class, (int *)0));
}
libresolv_hidden_def (p_class)
/*
* Return a mnemonic for an option
*/
const char *
p_option(u_long option) {
static char nbuf[40];
switch (option) {
case RES_INIT: return "init";
case RES_DEBUG: return "debug";
case RES_USEVC: return "use-vc";
case RES_IGNTC: return "igntc";
case RES_RECURSE: return "recurs";
case RES_DEFNAMES: return "defnam";
case RES_STAYOPEN: return "styopn";
case RES_DNSRCH: return "dnsrch";
case RES_INSECURE1: return "insecure1";
case RES_INSECURE2: return "insecure2";
case RES_NOALIASES: return "noaliases";
case DEPRECATED_RES_USE_INET6: return "inet6";
case RES_ROTATE: return "rotate";
case RES_USE_EDNS0: return "edns0";
case RES_SNGLKUP: return "single-request";
case RES_SNGLKUPREOP: return "single-request-reopen";
case RES_USE_DNSSEC: return "dnssec";
case RES_NOTLDQUERY: return "no-tld-query";
case RES_NORELOAD: return "no-reload";
/* XXX nonreentrant */
default: sprintf(nbuf, "?0x%lx?", (u_long)option);
return (nbuf);
}
}
libresolv_hidden_def (p_option)
/*
* Return a mnemonic for a time to live.
*/
const char *
p_time(u_int32_t value) {
static char nbuf[40]; /* XXX nonreentrant */
if (ns_format_ttl(value, nbuf, sizeof nbuf) < 0)
sprintf(nbuf, "%u", value);
return (nbuf);
}
/*
* Return a string for the rcode.
*/
const char *
p_rcode(int rcode) {
return (sym_ntos(__p_rcode_syms, rcode, (int *)0));
}
libresolv_hidden_def (p_rcode)
/*
* routines to convert between on-the-wire RR format and zone file format.
* Does not contain conversion to/from decimal degrees; divide or multiply
* by 60*60*1000 for that.
*/
static const unsigned int poweroften[10]=
{ 1, 10, 100, 1000, 10000, 100000,
1000000,10000000,100000000,1000000000};
/* takes an XeY precision/size value, returns a string representation. */
static const char *
precsize_ntoa (u_int8_t prec)
{
static char retbuf[sizeof "90000000.00"]; /* XXX nonreentrant */
unsigned long val;
int mantissa, exponent;
mantissa = (int)((prec >> 4) & 0x0f) % 10;
exponent = (int)((prec >> 0) & 0x0f) % 10;
val = mantissa * poweroften[exponent];
(void) sprintf(retbuf, "%ld.%.2ld", val/100, val%100);
return (retbuf);
}
/* converts ascii size/precision X * 10**Y(cm) to 0xXY. moves pointer. */
static u_int8_t
precsize_aton (const char **strptr)
{
unsigned int mval = 0, cmval = 0;
u_int8_t retval = 0;
const char *cp;
int exponent;
int mantissa;
cp = *strptr;
while (isdigit(*cp))
mval = mval * 10 + (*cp++ - '0');
if (*cp == '.') { /* centimeters */
cp++;
if (isdigit(*cp)) {
cmval = (*cp++ - '0') * 10;
if (isdigit(*cp)) {
cmval += (*cp++ - '0');
}
}
}
cmval = (mval * 100) + cmval;
for (exponent = 0; exponent < 9; exponent++)
if (cmval < poweroften[exponent+1])
break;
mantissa = cmval / poweroften[exponent];
if (mantissa > 9)
mantissa = 9;
retval = (mantissa << 4) | exponent;
*strptr = cp;
return (retval);
}
/* converts ascii lat/lon to unsigned encoded 32-bit number. moves pointer. */
static u_int32_t
latlon2ul (const char **latlonstrptr, int *which)
{
const char *cp;
u_int32_t retval;
int deg = 0, min = 0, secs = 0, secsfrac = 0;
cp = *latlonstrptr;
while (isdigit(*cp))
deg = deg * 10 + (*cp++ - '0');
while (isspace(*cp))
cp++;
if (!(isdigit(*cp)))
goto fndhemi;
while (isdigit(*cp))
min = min * 10 + (*cp++ - '0');
while (isspace(*cp))
cp++;
if (!(isdigit(*cp)))
goto fndhemi;
while (isdigit(*cp))
secs = secs * 10 + (*cp++ - '0');
if (*cp == '.') { /* decimal seconds */
cp++;
if (isdigit(*cp)) {
secsfrac = (*cp++ - '0') * 100;
if (isdigit(*cp)) {
secsfrac += (*cp++ - '0') * 10;
if (isdigit(*cp)) {
secsfrac += (*cp++ - '0');
}
}
}
}
while (!isspace(*cp)) /* if any trailing garbage */
cp++;
while (isspace(*cp))
cp++;
fndhemi:
switch (*cp) {
case 'N': case 'n':
case 'E': case 'e':
retval = ((unsigned)1<<31)
+ (((((deg * 60) + min) * 60) + secs) * 1000)
+ secsfrac;
break;
case 'S': case 's':
case 'W': case 'w':
retval = ((unsigned)1<<31)
- (((((deg * 60) + min) * 60) + secs) * 1000)
- secsfrac;
break;
default:
retval = 0; /* invalid value -- indicates error */
break;
}
switch (*cp) {
case 'N': case 'n':
case 'S': case 's':
*which = 1; /* latitude */
break;
case 'E': case 'e':
case 'W': case 'w':
*which = 2; /* longitude */
break;
default:
*which = 0; /* error */
break;
}
cp++; /* skip the hemisphere */
while (!isspace(*cp)) /* if any trailing garbage */
cp++;
while (isspace(*cp)) /* move to next field */
cp++;
*latlonstrptr = cp;
return (retval);
}
/* converts a zone file representation in a string to an RDATA on-the-wire
* representation. */
int
loc_aton (const char *ascii, u_char *binary)
{
const char *cp, *maxcp;
u_char *bcp;
u_int32_t latit = 0, longit = 0, alt = 0;
u_int32_t lltemp1 = 0, lltemp2 = 0;
int altmeters = 0, altfrac = 0, altsign = 1;
u_int8_t hp = 0x16; /* default = 1e6 cm = 10000.00m = 10km */
u_int8_t vp = 0x13; /* default = 1e3 cm = 10.00m */
u_int8_t siz = 0x12; /* default = 1e2 cm = 1.00m */
int which1 = 0, which2 = 0;
cp = ascii;
maxcp = cp + strlen(ascii);
lltemp1 = latlon2ul(&cp, &which1);
lltemp2 = latlon2ul(&cp, &which2);
switch (which1 + which2) {
case 3: /* 1 + 2, the only valid combination */
if ((which1 == 1) && (which2 == 2)) { /* normal case */
latit = lltemp1;
longit = lltemp2;
} else if ((which1 == 2) && (which2 == 1)) { /* reversed */
longit = lltemp1;
latit = lltemp2;
} else { /* some kind of brokenness */
return (0);
}
break;
default: /* we didn't get one of each */
return (0);
}
/* altitude */
if (*cp == '-') {
altsign = -1;
cp++;
}
if (*cp == '+')
cp++;
while (isdigit(*cp))
altmeters = altmeters * 10 + (*cp++ - '0');
if (*cp == '.') { /* decimal meters */
cp++;
if (isdigit(*cp)) {
altfrac = (*cp++ - '0') * 10;
if (isdigit(*cp)) {
altfrac += (*cp++ - '0');
}
}
}
alt = (10000000 + (altsign * (altmeters * 100 + altfrac)));
while (!isspace(*cp) && (cp < maxcp)) /* if trailing garbage or m */
cp++;
while (isspace(*cp) && (cp < maxcp))
cp++;
if (cp >= maxcp)
goto defaults;
siz = precsize_aton(&cp);
while (!isspace(*cp) && (cp < maxcp)) /* if trailing garbage or m */
cp++;
while (isspace(*cp) && (cp < maxcp))
cp++;
if (cp >= maxcp)
goto defaults;
hp = precsize_aton(&cp);
while (!isspace(*cp) && (cp < maxcp)) /* if trailing garbage or m */
cp++;
while (isspace(*cp) && (cp < maxcp))
cp++;
if (cp >= maxcp)
goto defaults;
vp = precsize_aton(&cp);
defaults:
bcp = binary;
*bcp++ = (u_int8_t) 0; /* version byte */
*bcp++ = siz;
*bcp++ = hp;
*bcp++ = vp;
PUTLONG(latit,bcp);
PUTLONG(longit,bcp);
PUTLONG(alt,bcp);
return (16); /* size of RR in octets */
}
/* takes an on-the-wire LOC RR and formats it in a human readable format. */
const char *
loc_ntoa (const u_char *binary, char *ascii)
{
static const char error[] = "?";
static char tmpbuf[sizeof
"1000 60 60.000 N 1000 60 60.000 W -12345678.00m 90000000.00m 90000000.00m 90000000.00m"];
const u_char *cp = binary;
int latdeg, latmin, latsec, latsecfrac;
int longdeg, longmin, longsec, longsecfrac;
char northsouth, eastwest;
int altmeters, altfrac, altsign;
const u_int32_t referencealt = 100000 * 100;
int32_t latval, longval, altval;
u_int32_t templ;
u_int8_t sizeval, hpval, vpval, versionval;
char *sizestr, *hpstr, *vpstr;
versionval = *cp++;
if (ascii == NULL)
ascii = tmpbuf;
if (versionval) {
(void) sprintf(ascii, "; error: unknown LOC RR version");
return (ascii);
}
sizeval = *cp++;
hpval = *cp++;
vpval = *cp++;
GETLONG(templ, cp);
latval = (templ - ((unsigned)1<<31));
GETLONG(templ, cp);
longval = (templ - ((unsigned)1<<31));
GETLONG(templ, cp);
if (templ < referencealt) { /* below WGS 84 spheroid */
altval = referencealt - templ;
altsign = -1;
} else {
altval = templ - referencealt;
altsign = 1;
}
if (latval < 0) {
northsouth = 'S';
latval = -latval;
} else
northsouth = 'N';
latsecfrac = latval % 1000;
latval = latval / 1000;
latsec = latval % 60;
latval = latval / 60;
latmin = latval % 60;
latval = latval / 60;
latdeg = latval;
if (longval < 0) {
eastwest = 'W';
longval = -longval;
} else
eastwest = 'E';
longsecfrac = longval % 1000;
longval = longval / 1000;
longsec = longval % 60;
longval = longval / 60;
longmin = longval % 60;
longval = longval / 60;
longdeg = longval;
altfrac = altval % 100;
altmeters = (altval / 100) * altsign;
if ((sizestr = strdup(precsize_ntoa(sizeval))) == NULL)
sizestr = (char *) error;
if ((hpstr = strdup(precsize_ntoa(hpval))) == NULL)
hpstr = (char *) error;
if ((vpstr = strdup(precsize_ntoa(vpval))) == NULL)
vpstr = (char *) error;
sprintf(ascii,
"%d %.2d %.2d.%.3d %c %d %.2d %.2d.%.3d %c %d.%.2dm %sm %sm %sm",
latdeg, latmin, latsec, latsecfrac, northsouth,
longdeg, longmin, longsec, longsecfrac, eastwest,
altmeters, altfrac, sizestr, hpstr, vpstr);
if (sizestr != (char *) error)
free(sizestr);
if (hpstr != (char *) error)
free(hpstr);
if (vpstr != (char *) error)
free(vpstr);
return (ascii);
}
libresolv_hidden_def (loc_ntoa)
/* Return the number of DNS hierarchy levels in the name. */
int
dn_count_labels(const char *name) {
int i, len, count;
len = strlen(name);
for (i = 0, count = 0; i < len; i++) {
/* XXX need to check for \. or use named's nlabels(). */
if (name[i] == '.')
count++;
}
/* don't count initial wildcard */
if (name[0] == '*')
if (count)
count--;
/* don't count the null label for root. */
/* if terminating '.' not found, must adjust */
/* count to include last label */
if (len > 0 && name[len-1] != '.')
count++;
return (count);
}
libresolv_hidden_def (__dn_count_labels)
/*
* Make dates expressed in seconds-since-Jan-1-1970 easy to read.
* SIG records are required to be printed like this, by the Secure DNS RFC.
*/
char *
p_secstodate (u_long secs) {
/* XXX nonreentrant */
static char output[15]; /* YYYYMMDDHHMMSS and null */
time_t clock = secs;
struct tm *time;
struct tm timebuf;
time = __gmtime_r(&clock, &timebuf);
time->tm_year += 1900;
time->tm_mon += 1;
sprintf(output, "%04d%02d%02d%02d%02d%02d",
time->tm_year, time->tm_mon, time->tm_mday,
time->tm_hour, time->tm_min, time->tm_sec);
return (output);
}
libresolv_hidden_def (__p_secstodate)
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