diff options
Diffstat (limited to 'usr.sbin/bind/lib/dns/rcode.c')
| -rw-r--r-- | usr.sbin/bind/lib/dns/rcode.c | 473 |
1 files changed, 473 insertions, 0 deletions
diff --git a/usr.sbin/bind/lib/dns/rcode.c b/usr.sbin/bind/lib/dns/rcode.c new file mode 100644 index 00000000000..f980fdcdf41 --- /dev/null +++ b/usr.sbin/bind/lib/dns/rcode.c @@ -0,0 +1,473 @@ +/* + * Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 1998-2003 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 ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC 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. + */ + +/* $ISC: rcode.c,v 1.1.4.1 2004/03/12 10:31:25 marka Exp $ */ + +#include <config.h> +#include <ctype.h> + +#include <isc/buffer.h> +#include <isc/parseint.h> +#include <isc/print.h> +#include <isc/region.h> +#include <isc/result.h> +#include <isc/stdio.h> +#include <isc/stdlib.h> +#include <isc/string.h> +#include <isc/types.h> +#include <isc/util.h> + +#include <dns/cert.h> +#include <dns/keyflags.h> +#include <dns/keyvalues.h> +#include <dns/rcode.h> +#include <dns/rdataclass.h> +#include <dns/result.h> +#include <dns/secalg.h> +#include <dns/secproto.h> + +#define RETERR(x) \ + do { \ + isc_result_t _r = (x); \ + if (_r != ISC_R_SUCCESS) \ + return (_r); \ + } while (0) + +#define NUMBERSIZE sizeof("037777777777") /* 2^32-1 octal + NUL */ + +#define RCODENAMES \ + /* standard rcodes */ \ + { dns_rcode_noerror, "NOERROR", 0}, \ + { dns_rcode_formerr, "FORMERR", 0}, \ + { dns_rcode_servfail, "SERVFAIL", 0}, \ + { dns_rcode_nxdomain, "NXDOMAIN", 0}, \ + { dns_rcode_notimp, "NOTIMP", 0}, \ + { dns_rcode_refused, "REFUSED", 0}, \ + { dns_rcode_yxdomain, "YXDOMAIN", 0}, \ + { dns_rcode_yxrrset, "YXRRSET", 0}, \ + { dns_rcode_nxrrset, "NXRRSET", 0}, \ + { dns_rcode_notauth, "NOTAUTH", 0}, \ + { dns_rcode_notzone, "NOTZONE", 0}, + +#define ERCODENAMES \ + /* extended rcodes */ \ + { dns_rcode_badvers, "BADVERS", 0}, \ + { 0, NULL, 0 } + +#define TSIGRCODENAMES \ + /* extended rcodes */ \ + { dns_tsigerror_badsig, "BADSIG", 0}, \ + { dns_tsigerror_badkey, "BADKEY", 0}, \ + { dns_tsigerror_badtime, "BADTIME", 0}, \ + { dns_tsigerror_badmode, "BADMODE", 0}, \ + { dns_tsigerror_badname, "BADNAME", 0}, \ + { dns_tsigerror_badalg, "BADALG", 0}, \ + { 0, NULL, 0 } + +/* RFC2538 section 2.1 */ + +#define CERTNAMES \ + { 1, "PKIX", 0}, \ + { 2, "SPKI", 0}, \ + { 3, "PGP", 0}, \ + { 253, "URI", 0}, \ + { 254, "OID", 0}, \ + { 0, NULL, 0} + +/* RFC2535 section 7, RFC3110 */ + +#define SECALGNAMES \ + { DNS_KEYALG_RSAMD5, "RSAMD5", 0 }, \ + { DNS_KEYALG_RSAMD5, "RSA", 0 }, \ + { DNS_KEYALG_DH, "DH", 0 }, \ + { DNS_KEYALG_DSA, "DSA", 0 }, \ + { DNS_KEYALG_ECC, "ECC", 0 }, \ + { DNS_KEYALG_RSASHA1, "RSASHA1", 0 }, \ + { DNS_KEYALG_INDIRECT, "INDIRECT", 0 }, \ + { DNS_KEYALG_PRIVATEDNS, "PRIVATEDNS", 0 }, \ + { DNS_KEYALG_PRIVATEOID, "PRIVATEOID", 0 }, \ + { 0, NULL, 0} + +/* RFC2535 section 7.1 */ + +#define SECPROTONAMES \ + { 0, "NONE", 0 }, \ + { 1, "TLS", 0 }, \ + { 2, "EMAIL", 0 }, \ + { 3, "DNSSEC", 0 }, \ + { 4, "IPSEC", 0 }, \ + { 255, "ALL", 0 }, \ + { 0, NULL, 0} + +struct tbl { + unsigned int value; + const char *name; + int flags; +}; + +static struct tbl rcodes[] = { RCODENAMES ERCODENAMES }; +static struct tbl tsigrcodes[] = { RCODENAMES TSIGRCODENAMES }; +static struct tbl certs[] = { CERTNAMES }; +static struct tbl secalgs[] = { SECALGNAMES }; +static struct tbl secprotos[] = { SECPROTONAMES }; + +static struct keyflag { + const char *name; + unsigned int value; + unsigned int mask; +} keyflags[] = { + { "NOCONF", 0x4000, 0xC000 }, + { "NOAUTH", 0x8000, 0xC000 }, + { "NOKEY", 0xC000, 0xC000 }, + { "FLAG2", 0x2000, 0x2000 }, + { "EXTEND", 0x1000, 0x1000 }, + { "FLAG4", 0x0800, 0x0800 }, + { "FLAG5", 0x0400, 0x0400 }, + { "USER", 0x0000, 0x0300 }, + { "ZONE", 0x0100, 0x0300 }, + { "HOST", 0x0200, 0x0300 }, + { "NTYP3", 0x0300, 0x0300 }, + { "FLAG8", 0x0080, 0x0080 }, + { "FLAG9", 0x0040, 0x0040 }, + { "FLAG10", 0x0020, 0x0020 }, + { "FLAG11", 0x0010, 0x0010 }, + { "SIG0", 0x0000, 0x000F }, + { "SIG1", 0x0001, 0x000F }, + { "SIG2", 0x0002, 0x000F }, + { "SIG3", 0x0003, 0x000F }, + { "SIG4", 0x0004, 0x000F }, + { "SIG5", 0x0005, 0x000F }, + { "SIG6", 0x0006, 0x000F }, + { "SIG7", 0x0007, 0x000F }, + { "SIG8", 0x0008, 0x000F }, + { "SIG9", 0x0009, 0x000F }, + { "SIG10", 0x000A, 0x000F }, + { "SIG11", 0x000B, 0x000F }, + { "SIG12", 0x000C, 0x000F }, + { "SIG13", 0x000D, 0x000F }, + { "SIG14", 0x000E, 0x000F }, + { "SIG15", 0x000F, 0x000F }, + { "KSK", DNS_KEYFLAG_KSK, DNS_KEYFLAG_KSK }, + { NULL, 0, 0 } +}; + +static isc_result_t +str_totext(const char *source, isc_buffer_t *target) { + unsigned int l; + isc_region_t region; + + isc_buffer_availableregion(target, ®ion); + l = strlen(source); + + if (l > region.length) + return (ISC_R_NOSPACE); + + memcpy(region.base, source, l); + isc_buffer_add(target, l); + return (ISC_R_SUCCESS); +} + +static isc_result_t +maybe_numeric(unsigned int *valuep, isc_textregion_t *source, + unsigned int max, isc_boolean_t hex_allowed) +{ + isc_result_t result; + isc_uint32_t n; + char buffer[NUMBERSIZE]; + + if (! isdigit(source->base[0] & 0xff) || + source->length > NUMBERSIZE - 1) + return (ISC_R_BADNUMBER); + + /* + * We have a potential number. Try to parse it with + * isc_parse_uint32(). isc_parse_uint32() requires + * null termination, so we must make a copy. + */ + strncpy(buffer, source->base, NUMBERSIZE); + INSIST(buffer[source->length] == '\0'); + + result = isc_parse_uint32(&n, buffer, 10); + if (result == ISC_R_BADNUMBER && hex_allowed) + result = isc_parse_uint32(&n, buffer, 16); + if (result != ISC_R_SUCCESS) + return (result); + if (n > max) + return (ISC_R_RANGE); + *valuep = n; + return (ISC_R_SUCCESS); +} + +static isc_result_t +dns_mnemonic_fromtext(unsigned int *valuep, isc_textregion_t *source, + struct tbl *table, unsigned int max) +{ + isc_result_t result; + int i; + + result = maybe_numeric(valuep, source, max, ISC_FALSE); + if (result != ISC_R_BADNUMBER) + return (result); + + for (i = 0; table[i].name != NULL; i++) { + unsigned int n; + n = strlen(table[i].name); + if (n == source->length && + strncasecmp(source->base, table[i].name, n) == 0) { + *valuep = table[i].value; + return (ISC_R_SUCCESS); + } + } + return (DNS_R_UNKNOWN); +} + +static isc_result_t +dns_mnemonic_totext(unsigned int value, isc_buffer_t *target, + struct tbl *table) +{ + int i = 0; + char buf[sizeof("4294967296")]; + while (table[i].name != NULL) { + if (table[i].value == value) { + return (str_totext(table[i].name, target)); + } + i++; + } + snprintf(buf, sizeof(buf), "%u", value); + return (str_totext(buf, target)); +} + +isc_result_t +dns_rcode_fromtext(dns_rcode_t *rcodep, isc_textregion_t *source) { + unsigned int value; + RETERR(dns_mnemonic_fromtext(&value, source, rcodes, 0xffff)); + *rcodep = value; + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_rcode_totext(dns_rcode_t rcode, isc_buffer_t *target) { + return (dns_mnemonic_totext(rcode, target, rcodes)); +} + +isc_result_t +dns_tsigrcode_fromtext(dns_rcode_t *rcodep, isc_textregion_t *source) { + unsigned int value; + RETERR(dns_mnemonic_fromtext(&value, source, tsigrcodes, 0xffff)); + *rcodep = value; + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_tsigrcode_totext(dns_rcode_t rcode, isc_buffer_t *target) { + return (dns_mnemonic_totext(rcode, target, tsigrcodes)); +} + +isc_result_t +dns_cert_fromtext(dns_cert_t *certp, isc_textregion_t *source) { + unsigned int value; + RETERR(dns_mnemonic_fromtext(&value, source, certs, 0xffff)); + *certp = value; + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_cert_totext(dns_cert_t cert, isc_buffer_t *target) { + return (dns_mnemonic_totext(cert, target, certs)); +} + +isc_result_t +dns_secalg_fromtext(dns_secalg_t *secalgp, isc_textregion_t *source) { + unsigned int value; + RETERR(dns_mnemonic_fromtext(&value, source, secalgs, 0xff)); + *secalgp = value; + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_secalg_totext(dns_secalg_t secalg, isc_buffer_t *target) { + return (dns_mnemonic_totext(secalg, target, secalgs)); +} + +isc_result_t +dns_secproto_fromtext(dns_secproto_t *secprotop, isc_textregion_t *source) { + unsigned int value; + RETERR(dns_mnemonic_fromtext(&value, source, secprotos, 0xff)); + *secprotop = value; + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_secproto_totext(dns_secproto_t secproto, isc_buffer_t *target) { + return (dns_mnemonic_totext(secproto, target, secprotos)); +} + +isc_result_t +dns_keyflags_fromtext(dns_keyflags_t *flagsp, isc_textregion_t *source) +{ + isc_result_t result; + char *text, *end; + unsigned int value, mask; + + result = maybe_numeric(&value, source, 0xffff, ISC_TRUE); + if (result == ISC_R_SUCCESS) { + *flagsp = value; + return (ISC_R_SUCCESS); + } + if (result != ISC_R_BADNUMBER) + return (result); + + text = source->base; + end = source->base + source->length; + value = mask = 0; + + while (text < end) { + struct keyflag *p; + unsigned int len; + char *delim = memchr(text, '|', end - text); + if (delim != NULL) + len = delim - text; + else + len = end - text; + for (p = keyflags; p->name != NULL; p++) { + if (strncasecmp(p->name, text, len) == 0) + break; + } + if (p->name == NULL) + return (DNS_R_UNKNOWNFLAG); + value |= p->value; +#ifdef notyet + if ((mask & p->mask) != 0) + warn("overlapping key flags"); +#endif + mask |= p->mask; + text += len; + if (delim != NULL) + text++; /* Skip "|" */ + } + *flagsp = value; + return (ISC_R_SUCCESS); +} + +/* + * This uses lots of hard coded values, but how often do we actually + * add classes? + */ +isc_result_t +dns_rdataclass_fromtext(dns_rdataclass_t *classp, isc_textregion_t *source) { +#define COMPARE(string, rdclass) \ + if (((sizeof(string) - 1) == source->length) \ + && (strncasecmp(source->base, string, source->length) == 0)) { \ + *classp = rdclass; \ + return (ISC_R_SUCCESS); \ + } + + switch (tolower((unsigned char)source->base[0])) { + case 'a': + COMPARE("any", dns_rdataclass_any); + break; + case 'c': + /* + * RFC1035 says the mnemonic for the CHAOS class is CH, + * but historical BIND practice is to call it CHAOS. + * We will accept both forms, but only generate CH. + */ + COMPARE("ch", dns_rdataclass_chaos); + COMPARE("chaos", dns_rdataclass_chaos); + + if (source->length > 5 && + source->length < (5 + sizeof("65000")) && + strncasecmp("class", source->base, 5) == 0) { + char buf[sizeof("65000")]; + char *endp; + unsigned int val; + + strncpy(buf, source->base + 5, source->length - 5); + buf[source->length - 5] = '\0'; + val = strtoul(buf, &endp, 10); + if (*endp == '\0' && val <= 0xffff) { + *classp = (dns_rdataclass_t)val; + return (ISC_R_SUCCESS); + } + } + break; + case 'h': + COMPARE("hs", dns_rdataclass_hs); + COMPARE("hesiod", dns_rdataclass_hs); + break; + case 'i': + COMPARE("in", dns_rdataclass_in); + break; + case 'n': + COMPARE("none", dns_rdataclass_none); + break; + case 'r': + COMPARE("reserved0", dns_rdataclass_reserved0); + break; + } + +#undef COMPARE + + return (DNS_R_UNKNOWN); +} + +isc_result_t +dns_rdataclass_totext(dns_rdataclass_t rdclass, isc_buffer_t *target) { + char buf[sizeof("CLASS65535")]; + + switch (rdclass) { + case dns_rdataclass_any: + return (str_totext("ANY", target)); + case dns_rdataclass_chaos: + return (str_totext("CH", target)); + case dns_rdataclass_hs: + return (str_totext("HS", target)); + case dns_rdataclass_in: + return (str_totext("IN", target)); + case dns_rdataclass_none: + return (str_totext("NONE", target)); + case dns_rdataclass_reserved0: + return (str_totext("RESERVED0", target)); + default: + snprintf(buf, sizeof(buf), "CLASS%u", rdclass); + return (str_totext(buf, target)); + } +} + +void +dns_rdataclass_format(dns_rdataclass_t rdclass, + char *array, unsigned int size) +{ + isc_result_t result; + isc_buffer_t buf; + + isc_buffer_init(&buf, array, size); + result = dns_rdataclass_totext(rdclass, &buf); + /* + * Null terminate. + */ + if (result == ISC_R_SUCCESS) { + if (isc_buffer_availablelength(&buf) >= 1) + isc_buffer_putuint8(&buf, 0); + else + result = ISC_R_NOSPACE; + } + if (result != ISC_R_SUCCESS) { + snprintf(array, size, "<unknown>"); + array[size - 1] = '\0'; + } +} |