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Diffstat (limited to 'lib/dns/name.c')
| -rw-r--r-- | lib/dns/name.c | 2408 |
1 files changed, 2408 insertions, 0 deletions
diff --git a/lib/dns/name.c b/lib/dns/name.c new file mode 100644 index 0000000..f4ea3e9 --- /dev/null +++ b/lib/dns/name.c @@ -0,0 +1,2408 @@ +/* + * Copyright (C) 2004-2008 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 1998-2003 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or 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. + */ + +/* $Id: name.c,v 1.165 2008/04/01 23:47:10 tbox Exp $ */ + +/*! \file */ + +#include <config.h> + +#include <ctype.h> +#include <stdlib.h> + +#include <isc/buffer.h> +#include <isc/hash.h> +#include <isc/mem.h> +#include <isc/once.h> +#include <isc/print.h> +#include <isc/string.h> +#include <isc/thread.h> +#include <isc/util.h> + +#include <dns/compress.h> +#include <dns/name.h> +#include <dns/result.h> + +#define VALID_NAME(n) ISC_MAGIC_VALID(n, DNS_NAME_MAGIC) + +typedef enum { + ft_init = 0, + ft_start, + ft_ordinary, + ft_initialescape, + ft_escape, + ft_escdecimal, + ft_at +} ft_state; + +typedef enum { + fw_start = 0, + fw_ordinary, + fw_copy, + fw_newcurrent +} fw_state; + +static char digitvalue[256] = { + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*16*/ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*32*/ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*48*/ + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, /*64*/ + -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*80*/ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*96*/ + -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*112*/ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*128*/ + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*256*/ +}; + +static unsigned char maptolower[] = { + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, + 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, + 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, + 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, + 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, + 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, + 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, + 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, + 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, + 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, + 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, + 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, + 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, + 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, + 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, + 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, + 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, + 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, + 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, + 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, + 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, + 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, + 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, + 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, + 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, + 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, + 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, + 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, + 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, + 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, + 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff +}; + +#define CONVERTTOASCII(c) +#define CONVERTFROMASCII(c) + +#define INIT_OFFSETS(name, var, default) \ + if (name->offsets != NULL) \ + var = name->offsets; \ + else \ + var = default; + +#define SETUP_OFFSETS(name, var, default) \ + if (name->offsets != NULL) \ + var = name->offsets; \ + else { \ + var = default; \ + set_offsets(name, var, NULL); \ + } + +/*% + * Note: If additional attributes are added that should not be set for + * empty names, MAKE_EMPTY() must be changed so it clears them. + */ +#define MAKE_EMPTY(name) \ +do { \ + name->ndata = NULL; \ + name->length = 0; \ + name->labels = 0; \ + name->attributes &= ~DNS_NAMEATTR_ABSOLUTE; \ +} while (0); + +/*% + * A name is "bindable" if it can be set to point to a new value, i.e. + * name->ndata and name->length may be changed. + */ +#define BINDABLE(name) \ + ((name->attributes & (DNS_NAMEATTR_READONLY|DNS_NAMEATTR_DYNAMIC)) \ + == 0) + +/*% + * Note that the name data must be a char array, not a string + * literal, to avoid compiler warnings about discarding + * the const attribute of a string. + */ +static unsigned char root_ndata[] = { '\0' }; +static unsigned char root_offsets[] = { 0 }; + +static dns_name_t root = +{ + DNS_NAME_MAGIC, + root_ndata, 1, 1, + DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE, + root_offsets, NULL, + {(void *)-1, (void *)-1}, + {NULL, NULL} +}; + +/* XXXDCL make const? */ +LIBDNS_EXTERNAL_DATA dns_name_t *dns_rootname = &root; + +static unsigned char wild_ndata[] = { '\001', '*' }; +static unsigned char wild_offsets[] = { 0 }; + +static dns_name_t wild = +{ + DNS_NAME_MAGIC, + wild_ndata, 2, 1, + DNS_NAMEATTR_READONLY, + wild_offsets, NULL, + {(void *)-1, (void *)-1}, + {NULL, NULL} +}; + +/* XXXDCL make const? */ +LIBDNS_EXTERNAL_DATA dns_name_t *dns_wildcardname = &wild; + +unsigned int +dns_fullname_hash(dns_name_t *name, isc_boolean_t case_sensitive); + +/* + * dns_name_t to text post-conversion procedure. + */ +#ifdef ISC_PLATFORM_USETHREADS +static int thread_key_initialized = 0; +static isc_mutex_t thread_key_mutex; +static isc_mem_t *thread_key_mctx = NULL; +static isc_thread_key_t totext_filter_proc_key; +static isc_once_t once = ISC_ONCE_INIT; +#else +static dns_name_totextfilter_t totext_filter_proc = NULL; +#endif + +static void +set_offsets(const dns_name_t *name, unsigned char *offsets, + dns_name_t *set_name); + +void +dns_name_init(dns_name_t *name, unsigned char *offsets) { + /* + * Initialize 'name'. + */ + DNS_NAME_INIT(name, offsets); +} + +void +dns_name_reset(dns_name_t *name) { + REQUIRE(VALID_NAME(name)); + REQUIRE(BINDABLE(name)); + + DNS_NAME_RESET(name); +} + +void +dns_name_invalidate(dns_name_t *name) { + /* + * Make 'name' invalid. + */ + + REQUIRE(VALID_NAME(name)); + + name->magic = 0; + name->ndata = NULL; + name->length = 0; + name->labels = 0; + name->attributes = 0; + name->offsets = NULL; + name->buffer = NULL; + ISC_LINK_INIT(name, link); +} + +void +dns_name_setbuffer(dns_name_t *name, isc_buffer_t *buffer) { + /* + * Dedicate a buffer for use with 'name'. + */ + + REQUIRE(VALID_NAME(name)); + REQUIRE((buffer != NULL && name->buffer == NULL) || + (buffer == NULL)); + + name->buffer = buffer; +} + +isc_boolean_t +dns_name_hasbuffer(const dns_name_t *name) { + /* + * Does 'name' have a dedicated buffer? + */ + + REQUIRE(VALID_NAME(name)); + + if (name->buffer != NULL) + return (ISC_TRUE); + + return (ISC_FALSE); +} + +isc_boolean_t +dns_name_isabsolute(const dns_name_t *name) { + + /* + * Does 'name' end in the root label? + */ + + REQUIRE(VALID_NAME(name)); + + if ((name->attributes & DNS_NAMEATTR_ABSOLUTE) != 0) + return (ISC_TRUE); + return (ISC_FALSE); +} + +#define hyphenchar(c) ((c) == 0x2d) +#define asterchar(c) ((c) == 0x2a) +#define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \ + || ((c) >= 0x61 && (c) <= 0x7a)) +#define digitchar(c) ((c) >= 0x30 && (c) <= 0x39) +#define borderchar(c) (alphachar(c) || digitchar(c)) +#define middlechar(c) (borderchar(c) || hyphenchar(c)) +#define domainchar(c) ((c) > 0x20 && (c) < 0x7f) + +isc_boolean_t +dns_name_ismailbox(const dns_name_t *name) { + unsigned char *ndata, ch; + unsigned int n; + isc_boolean_t first; + + REQUIRE(VALID_NAME(name)); + REQUIRE(name->labels > 0); + REQUIRE(name->attributes & DNS_NAMEATTR_ABSOLUTE); + + /* + * Root label. + */ + if (name->length == 1) + return (ISC_TRUE); + + ndata = name->ndata; + n = *ndata++; + INSIST(n <= 63); + while (n--) { + ch = *ndata++; + if (!domainchar(ch)) + return (ISC_FALSE); + } + + if (ndata == name->ndata + name->length) + return (ISC_FALSE); + + /* + * RFC292/RFC1123 hostname. + */ + while (ndata < (name->ndata + name->length)) { + n = *ndata++; + INSIST(n <= 63); + first = ISC_TRUE; + while (n--) { + ch = *ndata++; + if (first || n == 0) { + if (!borderchar(ch)) + return (ISC_FALSE); + } else { + if (!middlechar(ch)) + return (ISC_FALSE); + } + first = ISC_FALSE; + } + } + return (ISC_TRUE); +} + +isc_boolean_t +dns_name_ishostname(const dns_name_t *name, isc_boolean_t wildcard) { + unsigned char *ndata, ch; + unsigned int n; + isc_boolean_t first; + + REQUIRE(VALID_NAME(name)); + REQUIRE(name->labels > 0); + REQUIRE(name->attributes & DNS_NAMEATTR_ABSOLUTE); + + /* + * Root label. + */ + if (name->length == 1) + return (ISC_TRUE); + + /* + * Skip wildcard if this is a ownername. + */ + ndata = name->ndata; + if (wildcard && ndata[0] == 1 && ndata[1] == '*') + ndata += 2; + + /* + * RFC292/RFC1123 hostname. + */ + while (ndata < (name->ndata + name->length)) { + n = *ndata++; + INSIST(n <= 63); + first = ISC_TRUE; + while (n--) { + ch = *ndata++; + if (first || n == 0) { + if (!borderchar(ch)) + return (ISC_FALSE); + } else { + if (!middlechar(ch)) + return (ISC_FALSE); + } + first = ISC_FALSE; + } + } + return (ISC_TRUE); +} + +isc_boolean_t +dns_name_iswildcard(const dns_name_t *name) { + unsigned char *ndata; + + /* + * Is 'name' a wildcard name? + */ + + REQUIRE(VALID_NAME(name)); + REQUIRE(name->labels > 0); + + if (name->length >= 2) { + ndata = name->ndata; + if (ndata[0] == 1 && ndata[1] == '*') + return (ISC_TRUE); + } + + return (ISC_FALSE); +} + +isc_boolean_t +dns_name_internalwildcard(const dns_name_t *name) { + unsigned char *ndata; + unsigned int count; + unsigned int label; + + /* + * Does 'name' contain a internal wildcard? + */ + + REQUIRE(VALID_NAME(name)); + REQUIRE(name->labels > 0); + + /* + * Skip first label. + */ + ndata = name->ndata; + count = *ndata++; + INSIST(count <= 63); + ndata += count; + label = 1; + /* + * Check all but the last of the remaining labels. + */ + while (label + 1 < name->labels) { + count = *ndata++; + INSIST(count <= 63); + if (count == 1 && *ndata == '*') + return (ISC_TRUE); + ndata += count; + label++; + } + return (ISC_FALSE); +} + +static inline unsigned int +name_hash(dns_name_t *name, isc_boolean_t case_sensitive) { + unsigned int length; + const unsigned char *s; + unsigned int h = 0; + unsigned char c; + + length = name->length; + if (length > 16) + length = 16; + + /* + * This hash function is similar to the one Ousterhout + * uses in Tcl. + */ + s = name->ndata; + if (case_sensitive) { + while (length > 0) { + h += ( h << 3 ) + *s; + s++; + length--; + } + } else { + while (length > 0) { + c = maptolower[*s]; + h += ( h << 3 ) + c; + s++; + length--; + } + } + + return (h); +} + +unsigned int +dns_name_hash(dns_name_t *name, isc_boolean_t case_sensitive) { + /* + * Provide a hash value for 'name'. + */ + REQUIRE(VALID_NAME(name)); + + if (name->labels == 0) + return (0); + + return (name_hash(name, case_sensitive)); +} + +unsigned int +dns_name_fullhash(dns_name_t *name, isc_boolean_t case_sensitive) { + /* + * Provide a hash value for 'name'. + */ + REQUIRE(VALID_NAME(name)); + + if (name->labels == 0) + return (0); + + return (isc_hash_calc((const unsigned char *)name->ndata, + name->length, case_sensitive)); +} + +unsigned int +dns_fullname_hash(dns_name_t *name, isc_boolean_t case_sensitive) { + /* + * This function was deprecated due to the breakage of the name space + * convention. We only keep this internally to provide binary backward + * compatibility. + */ + REQUIRE(VALID_NAME(name)); + + return (dns_name_fullhash(name, case_sensitive)); +} + +unsigned int +dns_name_hashbylabel(dns_name_t *name, isc_boolean_t case_sensitive) { + unsigned char *offsets; + dns_offsets_t odata; + dns_name_t tname; + unsigned int h = 0; + unsigned int i; + + /* + * Provide a hash value for 'name'. + */ + REQUIRE(VALID_NAME(name)); + + if (name->labels == 0) + return (0); + else if (name->labels == 1) + return (name_hash(name, case_sensitive)); + + SETUP_OFFSETS(name, offsets, odata); + DNS_NAME_INIT(&tname, NULL); + tname.labels = 1; + h = 0; + for (i = 0; i < name->labels; i++) { + tname.ndata = name->ndata + offsets[i]; + if (i == name->labels - 1) + tname.length = name->length - offsets[i]; + else + tname.length = offsets[i + 1] - offsets[i]; + h += name_hash(&tname, case_sensitive); + } + + return (h); +} + +dns_namereln_t +dns_name_fullcompare(const dns_name_t *name1, const dns_name_t *name2, + int *orderp, unsigned int *nlabelsp) +{ + unsigned int l1, l2, l, count1, count2, count, nlabels; + int cdiff, ldiff, chdiff; + unsigned char *label1, *label2; + unsigned char *offsets1, *offsets2; + dns_offsets_t odata1, odata2; + dns_namereln_t namereln = dns_namereln_none; + + /* + * Determine the relative ordering under the DNSSEC order relation of + * 'name1' and 'name2', and also determine the hierarchical + * relationship of the names. + * + * Note: It makes no sense for one of the names to be relative and the + * other absolute. If both names are relative, then to be meaningfully + * compared the caller must ensure that they are both relative to the + * same domain. + */ + + REQUIRE(VALID_NAME(name1)); + REQUIRE(VALID_NAME(name2)); + REQUIRE(orderp != NULL); + REQUIRE(nlabelsp != NULL); + /* + * Either name1 is absolute and name2 is absolute, or neither is. + */ + REQUIRE((name1->attributes & DNS_NAMEATTR_ABSOLUTE) == + (name2->attributes & DNS_NAMEATTR_ABSOLUTE)); + + SETUP_OFFSETS(name1, offsets1, odata1); + SETUP_OFFSETS(name2, offsets2, odata2); + + nlabels = 0; + l1 = name1->labels; + l2 = name2->labels; + ldiff = (int)l1 - (int)l2; + if (ldiff < 0) + l = l1; + else + l = l2; + + while (l > 0) { + l--; + l1--; + l2--; + label1 = &name1->ndata[offsets1[l1]]; + label2 = &name2->ndata[offsets2[l2]]; + count1 = *label1++; + count2 = *label2++; + + /* + * We dropped bitstring labels, and we don't support any + * other extended label types. + */ + INSIST(count1 <= 63 && count2 <= 63); + + cdiff = (int)count1 - (int)count2; + if (cdiff < 0) + count = count1; + else + count = count2; + + while (count > 0) { + chdiff = (int)maptolower[*label1] - + (int)maptolower[*label2]; + if (chdiff != 0) { + *orderp = chdiff; + goto done; + } + count--; + label1++; + label2++; + } + if (cdiff != 0) { + *orderp = cdiff; + goto done; + } + nlabels++; + } + + *orderp = ldiff; + if (ldiff < 0) + namereln = dns_namereln_contains; + else if (ldiff > 0) + namereln = dns_namereln_subdomain; + else + namereln = dns_namereln_equal; + + done: + *nlabelsp = nlabels; + + if (nlabels > 0 && namereln == dns_namereln_none) + namereln = dns_namereln_commonancestor; + + return (namereln); +} + +int +dns_name_compare(const dns_name_t *name1, const dns_name_t *name2) { + int order; + unsigned int nlabels; + + /* + * Determine the relative ordering under the DNSSEC order relation of + * 'name1' and 'name2'. + * + * Note: It makes no sense for one of the names to be relative and the + * other absolute. If both names are relative, then to be meaningfully + * compared the caller must ensure that they are both relative to the + * same domain. + */ + + (void)dns_name_fullcompare(name1, name2, &order, &nlabels); + + return (order); +} + +isc_boolean_t +dns_name_equal(const dns_name_t *name1, const dns_name_t *name2) { + unsigned int l, count; + unsigned char c; + unsigned char *label1, *label2; + + /* + * Are 'name1' and 'name2' equal? + * + * Note: It makes no sense for one of the names to be relative and the + * other absolute. If both names are relative, then to be meaningfully + * compared the caller must ensure that they are both relative to the + * same domain. + */ + + REQUIRE(VALID_NAME(name1)); + REQUIRE(VALID_NAME(name2)); + /* + * Either name1 is absolute and name2 is absolute, or neither is. + */ + REQUIRE((name1->attributes & DNS_NAMEATTR_ABSOLUTE) == + (name2->attributes & DNS_NAMEATTR_ABSOLUTE)); + + if (name1->length != name2->length) + return (ISC_FALSE); + + l = name1->labels; + + if (l != name2->labels) + return (ISC_FALSE); + + label1 = name1->ndata; + label2 = name2->ndata; + while (l > 0) { + l--; + count = *label1++; + if (count != *label2++) + return (ISC_FALSE); + + INSIST(count <= 63); /* no bitstring support */ + + while (count > 0) { + count--; + c = maptolower[*label1++]; + if (c != maptolower[*label2++]) + return (ISC_FALSE); + } + } + + return (ISC_TRUE); +} + +isc_boolean_t +dns_name_caseequal(const dns_name_t *name1, const dns_name_t *name2) { + + /* + * Are 'name1' and 'name2' equal? + * + * Note: It makes no sense for one of the names to be relative and the + * other absolute. If both names are relative, then to be meaningfully + * compared the caller must ensure that they are both relative to the + * same domain. + */ + + REQUIRE(VALID_NAME(name1)); + REQUIRE(VALID_NAME(name2)); + /* + * Either name1 is absolute and name2 is absolute, or neither is. + */ + REQUIRE((name1->attributes & DNS_NAMEATTR_ABSOLUTE) == + (name2->attributes & DNS_NAMEATTR_ABSOLUTE)); + + if (name1->length != name2->length) + return (ISC_FALSE); + + if (memcmp(name1->ndata, name2->ndata, name1->length) != 0) + return (ISC_FALSE); + + return (ISC_TRUE); +} + +int +dns_name_rdatacompare(const dns_name_t *name1, const dns_name_t *name2) { + unsigned int l1, l2, l, count1, count2, count; + unsigned char c1, c2; + unsigned char *label1, *label2; + + /* + * Compare two absolute names as rdata. + */ + + REQUIRE(VALID_NAME(name1)); + REQUIRE(name1->labels > 0); + REQUIRE((name1->attributes & DNS_NAMEATTR_ABSOLUTE) != 0); + REQUIRE(VALID_NAME(name2)); + REQUIRE(name2->labels > 0); + REQUIRE((name2->attributes & DNS_NAMEATTR_ABSOLUTE) != 0); + + l1 = name1->labels; + l2 = name2->labels; + + l = (l1 < l2) ? l1 : l2; + + label1 = name1->ndata; + label2 = name2->ndata; + while (l > 0) { + l--; + count1 = *label1++; + count2 = *label2++; + + /* no bitstring support */ + INSIST(count1 <= 63 && count2 <= 63); + + if (count1 != count2) + return ((count1 < count2) ? -1 : 1); + count = count1; + while (count > 0) { + count--; + c1 = maptolower[*label1++]; + c2 = maptolower[*label2++]; + if (c1 < c2) + return (-1); + else if (c1 > c2) + return (1); + } + } + + /* + * If one name had more labels than the other, their common + * prefix must have been different because the shorter name + * ended with the root label and the longer one can't have + * a root label in the middle of it. Therefore, if we get + * to this point, the lengths must be equal. + */ + INSIST(l1 == l2); + + return (0); +} + +isc_boolean_t +dns_name_issubdomain(const dns_name_t *name1, const dns_name_t *name2) { + int order; + unsigned int nlabels; + dns_namereln_t namereln; + + /* + * Is 'name1' a subdomain of 'name2'? + * + * Note: It makes no sense for one of the names to be relative and the + * other absolute. If both names are relative, then to be meaningfully + * compared the caller must ensure that they are both relative to the + * same domain. + */ + + namereln = dns_name_fullcompare(name1, name2, &order, &nlabels); + if (namereln == dns_namereln_subdomain || + namereln == dns_namereln_equal) + return (ISC_TRUE); + + return (ISC_FALSE); +} + +isc_boolean_t +dns_name_matcheswildcard(const dns_name_t *name, const dns_name_t *wname) { + int order; + unsigned int nlabels, labels; + dns_name_t tname; + + REQUIRE(VALID_NAME(name)); + REQUIRE(name->labels > 0); + REQUIRE(VALID_NAME(wname)); + labels = wname->labels; + REQUIRE(labels > 0); + REQUIRE(dns_name_iswildcard(wname)); + + DNS_NAME_INIT(&tname, NULL); + dns_name_getlabelsequence(wname, 1, labels - 1, &tname); + if (dns_name_fullcompare(name, &tname, &order, &nlabels) == + dns_namereln_subdomain) + return (ISC_TRUE); + return (ISC_FALSE); +} + +unsigned int +dns_name_countlabels(const dns_name_t *name) { + /* + * How many labels does 'name' have? + */ + + REQUIRE(VALID_NAME(name)); + + ENSURE(name->labels <= 128); + + return (name->labels); +} + +void +dns_name_getlabel(const dns_name_t *name, unsigned int n, dns_label_t *label) { + unsigned char *offsets; + dns_offsets_t odata; + + /* + * Make 'label' refer to the 'n'th least significant label of 'name'. + */ + + REQUIRE(VALID_NAME(name)); + REQUIRE(name->labels > 0); + REQUIRE(n < name->labels); + REQUIRE(label != NULL); + + SETUP_OFFSETS(name, offsets, odata); + + label->base = &name->ndata[offsets[n]]; + if (n == name->labels - 1) + label->length = name->length - offsets[n]; + else + label->length = offsets[n + 1] - offsets[n]; +} + +void +dns_name_getlabelsequence(const dns_name_t *source, + unsigned int first, unsigned int n, + dns_name_t *target) +{ + unsigned char *offsets; + dns_offsets_t odata; + unsigned int firstoffset, endoffset; + + /* + * Make 'target' refer to the 'n' labels including and following + * 'first' in 'source'. + */ + + REQUIRE(VALID_NAME(source)); + REQUIRE(VALID_NAME(target)); + REQUIRE(first <= source->labels); + REQUIRE(first + n <= source->labels); + REQUIRE(BINDABLE(target)); + + SETUP_OFFSETS(source, offsets, odata); + + if (first == source->labels) + firstoffset = source->length; + else + firstoffset = offsets[first]; + + if (first + n == source->labels) + endoffset = source->length; + else + endoffset = offsets[first + n]; + + target->ndata = &source->ndata[firstoffset]; + target->length = endoffset - firstoffset; + + if (first + n == source->labels && n > 0 && + (source->attributes & DNS_NAMEATTR_ABSOLUTE) != 0) + target->attributes |= DNS_NAMEATTR_ABSOLUTE; + else + target->attributes &= ~DNS_NAMEATTR_ABSOLUTE; + + target->labels = n; + + /* + * If source and target are the same, and we're making target + * a prefix of source, the offsets table is correct already + * so we don't need to call set_offsets(). + */ + if (target->offsets != NULL && + (target != source || first != 0)) + set_offsets(target, target->offsets, NULL); +} + +void +dns_name_clone(const dns_name_t *source, dns_name_t *target) { + + /* + * Make 'target' refer to the same name as 'source'. + */ + + REQUIRE(VALID_NAME(source)); + REQUIRE(VALID_NAME(target)); + REQUIRE(BINDABLE(target)); + + target->ndata = source->ndata; + target->length = source->length; + target->labels = source->labels; + target->attributes = source->attributes & + (unsigned int)~(DNS_NAMEATTR_READONLY | DNS_NAMEATTR_DYNAMIC | + DNS_NAMEATTR_DYNOFFSETS); + if (target->offsets != NULL && source->labels > 0) { + if (source->offsets != NULL) + memcpy(target->offsets, source->offsets, + source->labels); + else + set_offsets(target, target->offsets, NULL); + } +} + +void +dns_name_fromregion(dns_name_t *name, const isc_region_t *r) { + unsigned char *offsets; + dns_offsets_t odata; + unsigned int len; + isc_region_t r2; + + /* + * Make 'name' refer to region 'r'. + */ + + REQUIRE(VALID_NAME(name)); + REQUIRE(r != NULL); + REQUIRE(BINDABLE(name)); + + INIT_OFFSETS(name, offsets, odata); + + if (name->buffer != NULL) { + isc_buffer_clear(name->buffer); + isc_buffer_availableregion(name->buffer, &r2); + len = (r->length < r2.length) ? r->length : r2.length; + if (len > DNS_NAME_MAXWIRE) + len = DNS_NAME_MAXWIRE; + memcpy(r2.base, r->base, len); + name->ndata = r2.base; + name->length = len; + } else { + name->ndata = r->base; + name->length = (r->length <= DNS_NAME_MAXWIRE) ? + r->length : DNS_NAME_MAXWIRE; + } + + if (r->length > 0) + set_offsets(name, offsets, name); + else { + name->labels = 0; + name->attributes &= ~DNS_NAMEATTR_ABSOLUTE; + } + + if (name->buffer != NULL) + isc_buffer_add(name->buffer, name->length); +} + +void +dns_name_toregion(dns_name_t *name, isc_region_t *r) { + /* + * Make 'r' refer to 'name'. + */ + + REQUIRE(VALID_NAME(name)); + REQUIRE(r != NULL); + + DNS_NAME_TOREGION(name, r); +} + + +isc_result_t +dns_name_fromtext(dns_name_t *name, isc_buffer_t *source, + dns_name_t *origin, unsigned int options, + isc_buffer_t *target) +{ + unsigned char *ndata, *label; + char *tdata; + char c; + ft_state state; + unsigned int value, count; + unsigned int n1, n2, tlen, nrem, nused, digits, labels, tused; + isc_boolean_t done; + unsigned char *offsets; + dns_offsets_t odata; + isc_boolean_t downcase; + + /* + * Convert the textual representation of a DNS name at source + * into uncompressed wire form stored in target. + * + * Notes: + * Relative domain names will have 'origin' appended to them + * unless 'origin' is NULL, in which case relative domain names + * will remain relative. + */ + + REQUIRE(VALID_NAME(name)); + REQUIRE(ISC_BUFFER_VALID(source)); + REQUIRE((target != NULL && ISC_BUFFER_VALID(target)) || + (target == NULL && ISC_BUFFER_VALID(name->buffer))); + + downcase = ISC_TF((options & DNS_NAME_DOWNCASE) != 0); + + if (target == NULL && name->buffer != NULL) { + target = name->buffer; + isc_buffer_clear(target); + } + + REQUIRE(BINDABLE(name)); + + INIT_OFFSETS(name, offsets, odata); + offsets[0] = 0; + + /* + * Initialize things to make the compiler happy; they're not required. + */ + n1 = 0; + n2 = 0; + label = NULL; + digits = 0; + value = 0; + count = 0; + + /* + * Make 'name' empty in case of failure. + */ + MAKE_EMPTY(name); + + /* + * Set up the state machine. + */ + tdata = (char *)source->base + source->current; + tlen = isc_buffer_remaininglength(source); + tused = 0; + ndata = isc_buffer_used(target); + nrem = isc_buffer_availablelength(target); + if (nrem > 255) + nrem = 255; + nused = 0; + labels = 0; + done = ISC_FALSE; + state = ft_init; + + while (nrem > 0 && tlen > 0 && !done) { + c = *tdata++; + tlen--; + tused++; + + switch (state) { + case ft_init: + /* + * Is this the root name? + */ + if (c == '.') { + if (tlen != 0) + return (DNS_R_EMPTYLABEL); + labels++; + *ndata++ = 0; + nrem--; + nused++; + done = ISC_TRUE; + break; + } + if (c == '@' && tlen == 0) { + state = ft_at; + break; + } + + /* FALLTHROUGH */ + case ft_start: + label = ndata; + ndata++; + nrem--; + nused++; + count = 0; + if (c == '\\') { + state = ft_initialescape; + break; + } + state = ft_ordinary; + if (nrem == 0) + return (ISC_R_NOSPACE); + /* FALLTHROUGH */ + case ft_ordinary: + if (c == '.') { + if (count == 0) + return (DNS_R_EMPTYLABEL); + *label = count; + labels++; + INSIST(labels <= 127); + offsets[labels] = nused; + if (tlen == 0) { + labels++; + *ndata++ = 0; + nrem--; + nused++; + done = ISC_TRUE; + } + state = ft_start; + } else if (c == '\\') { + state = ft_escape; + } else { + if (count >= 63) + return (DNS_R_LABELTOOLONG); + count++; + CONVERTTOASCII(c); + if (downcase) + c = maptolower[(int)c]; + *ndata++ = c; + nrem--; + nused++; + } + break; + case ft_initialescape: + if (c == '[') { + /* + * This looks like a bitstring label, which + * was deprecated. Intentionally drop it. + */ + return (DNS_R_BADLABELTYPE); + } + state = ft_escape; + /* FALLTHROUGH */ + case ft_escape: + if (!isdigit(c & 0xff)) { + if (count >= 63) + return (DNS_R_LABELTOOLONG); + count++; + CONVERTTOASCII(c); + if (downcase) + c = maptolower[(int)c]; + *ndata++ = c; + nrem--; + nused++; + state = ft_ordinary; + break; + } + digits = 0; + value = 0; + state = ft_escdecimal; + /* FALLTHROUGH */ + case ft_escdecimal: + if (!isdigit(c & 0xff)) + return (DNS_R_BADESCAPE); + value *= 10; + value += digitvalue[(int)c]; + digits++; + if (digits == 3) { + if (value > 255) + return (DNS_R_BADESCAPE); + if (count >= 63) + return (DNS_R_LABELTOOLONG); + count++; + if (downcase) + value = maptolower[value]; + *ndata++ = value; + nrem--; + nused++; + state = ft_ordinary; + } + break; + default: + FATAL_ERROR(__FILE__, __LINE__, + "Unexpected state %d", state); + /* Does not return. */ + } + } + + if (!done) { + if (nrem == 0) + return (ISC_R_NOSPACE); + INSIST(tlen == 0); + if (state != ft_ordinary && state != ft_at) + return (ISC_R_UNEXPECTEDEND); + if (state == ft_ordinary) { + INSIST(count != 0); + *label = count; + labels++; + INSIST(labels <= 127); + offsets[labels] = nused; + } + if (origin != NULL) { + if (nrem < origin->length) + return (ISC_R_NOSPACE); + label = origin->ndata; + n1 = origin->length; + nrem -= n1; + while (n1 > 0) { + n2 = *label++; + INSIST(n2 <= 63); /* no bitstring support */ + *ndata++ = n2; + n1 -= n2 + 1; + nused += n2 + 1; + while (n2 > 0) { + c = *label++; + if (downcase) + c = maptolower[(int)c]; + *ndata++ = c; + n2--; + } + labels++; + if (n1 > 0) { + INSIST(labels <= 127); + offsets[labels] = nused; + } + } + if ((origin->attributes & DNS_NAMEATTR_ABSOLUTE) != 0) + name->attributes |= DNS_NAMEATTR_ABSOLUTE; + } + } else + name->attributes |= DNS_NAMEATTR_ABSOLUTE; + + name->ndata = (unsigned char *)target->base + target->used; + name->labels = labels; + name->length = nused; + + isc_buffer_forward(source, tused); + isc_buffer_add(target, name->length); + + return (ISC_R_SUCCESS); +} + +#ifdef ISC_PLATFORM_USETHREADS +static void +free_specific(void *arg) { + dns_name_totextfilter_t *mem = arg; + isc_mem_put(thread_key_mctx, mem, sizeof(*mem)); + /* Stop use being called again. */ + (void)isc_thread_key_setspecific(totext_filter_proc_key, NULL); +} + +static void +thread_key_mutex_init(void) { + RUNTIME_CHECK(isc_mutex_init(&thread_key_mutex) == ISC_R_SUCCESS); +} + +static isc_result_t +totext_filter_proc_key_init(void) { + isc_result_t result; + + /* + * We need the call to isc_once_do() to support profiled mutex + * otherwise thread_key_mutex could be initialized at compile time. + */ + result = isc_once_do(&once, thread_key_mutex_init); + if (result != ISC_R_SUCCESS) + return (result); + + if (!thread_key_initialized) { + LOCK(&thread_key_mutex); + if (thread_key_mctx == NULL) + result = isc_mem_create2(0, 0, &thread_key_mctx, 0); + if (result != ISC_R_SUCCESS) + goto unlock; + isc_mem_setname(thread_key_mctx, "threadkey", NULL); + isc_mem_setdestroycheck(thread_key_mctx, ISC_FALSE); + + if (!thread_key_initialized && + isc_thread_key_create(&totext_filter_proc_key, + free_specific) != 0) { + result = ISC_R_FAILURE; + isc_mem_detach(&thread_key_mctx); + } else + thread_key_initialized = 1; + unlock: + UNLOCK(&thread_key_mutex); + } + return (result); +} +#endif + +isc_result_t +dns_name_totext(dns_name_t *name, isc_boolean_t omit_final_dot, + isc_buffer_t *target) +{ + unsigned char *ndata; + char *tdata; + unsigned int nlen, tlen; + unsigned char c; + unsigned int trem, count; + unsigned int labels; + isc_boolean_t saw_root = ISC_FALSE; + unsigned int oused = target->used; +#ifdef ISC_PLATFORM_USETHREADS + dns_name_totextfilter_t *mem; + dns_name_totextfilter_t totext_filter_proc = NULL; + isc_result_t result; +#endif + + /* + * This function assumes the name is in proper uncompressed + * wire format. + */ + REQUIRE(VALID_NAME(name)); + REQUIRE(ISC_BUFFER_VALID(target)); + +#ifdef ISC_PLATFORM_USETHREADS + result = totext_filter_proc_key_init(); + if (result != ISC_R_SUCCESS) + return (result); +#endif + ndata = name->ndata; + nlen = name->length; + labels = name->labels; + tdata = isc_buffer_used(target); + tlen = isc_buffer_availablelength(target); + + trem = tlen; + + if (labels == 0 && nlen == 0) { + /* + * Special handling for an empty name. + */ + if (trem == 0) + return (ISC_R_NOSPACE); + + /* + * The names of these booleans are misleading in this case. + * This empty name is not necessarily from the root node of + * the DNS root zone, nor is a final dot going to be included. + * They need to be set this way, though, to keep the "@" + * from being trounced. + */ + saw_root = ISC_TRUE; + omit_final_dot = ISC_FALSE; + *tdata++ = '@'; + trem--; + + /* + * Skip the while() loop. + */ + nlen = 0; + } else if (nlen == 1 && labels == 1 && *ndata == '\0') { + /* + * Special handling for the root label. + */ + if (trem == 0) + return (ISC_R_NOSPACE); + + saw_root = ISC_TRUE; + omit_final_dot = ISC_FALSE; + *tdata++ = '.'; + trem--; + + /* + * Skip the while() loop. + */ + nlen = 0; + } + + while (labels > 0 && nlen > 0 && trem > 0) { + labels--; + count = *ndata++; + nlen--; + if (count == 0) { + saw_root = ISC_TRUE; + break; + } + if (count < 64) { + INSIST(nlen >= count); + while (count > 0) { + c = *ndata; + switch (c) { + case 0x22: /* '"' */ + case 0x28: /* '(' */ + case 0x29: /* ')' */ + case 0x2E: /* '.' */ + case 0x3B: /* ';' */ + case 0x5C: /* '\\' */ + /* Special modifiers in zone files. */ + case 0x40: /* '@' */ + case 0x24: /* '$' */ + if (trem < 2) + return (ISC_R_NOSPACE); + *tdata++ = '\\'; + CONVERTFROMASCII(c); + *tdata++ = c; + ndata++; + trem -= 2; + nlen--; + break; + default: + if (c > 0x20 && c < 0x7f) { + if (trem == 0) + return (ISC_R_NOSPACE); + CONVERTFROMASCII(c); + *tdata++ = c; + ndata++; + trem--; + nlen--; + } else { + if (trem < 4) + return (ISC_R_NOSPACE); + *tdata++ = 0x5c; + *tdata++ = 0x30 + + ((c / 100) % 10); + *tdata++ = 0x30 + + ((c / 10) % 10); + *tdata++ = 0x30 + (c % 10); + trem -= 4; + ndata++; + nlen--; + } + } + count--; + } + } else { + FATAL_ERROR(__FILE__, __LINE__, + "Unexpected label type %02x", count); + /* NOTREACHED */ + } + + /* + * The following assumes names are absolute. If not, we + * fix things up later. Note that this means that in some + * cases one more byte of text buffer is required than is + * needed in the final output. + */ + if (trem == 0) + return (ISC_R_NOSPACE); + *tdata++ = '.'; + trem--; + } + + if (nlen != 0 && trem == 0) + return (ISC_R_NOSPACE); + + if (!saw_root || omit_final_dot) + trem++; + + isc_buffer_add(target, tlen - trem); + +#ifdef ISC_PLATFORM_USETHREADS + mem = isc_thread_key_getspecific(totext_filter_proc_key); + if (mem != NULL) + totext_filter_proc = *mem; +#endif + if (totext_filter_proc != NULL) + return ((*totext_filter_proc)(target, oused, saw_root)); + + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_name_tofilenametext(dns_name_t *name, isc_boolean_t omit_final_dot, + isc_buffer_t *target) +{ + unsigned char *ndata; + char *tdata; + unsigned int nlen, tlen; + unsigned char c; + unsigned int trem, count; + unsigned int labels; + + /* + * This function assumes the name is in proper uncompressed + * wire format. + */ + REQUIRE(VALID_NAME(name)); + REQUIRE((name->attributes & DNS_NAMEATTR_ABSOLUTE) != 0); + REQUIRE(ISC_BUFFER_VALID(target)); + + ndata = name->ndata; + nlen = name->length; + labels = name->labels; + tdata = isc_buffer_used(target); + tlen = isc_buffer_availablelength(target); + + trem = tlen; + + if (nlen == 1 && labels == 1 && *ndata == '\0') { + /* + * Special handling for the root label. + */ + if (trem == 0) + return (ISC_R_NOSPACE); + + omit_final_dot = ISC_FALSE; + *tdata++ = '.'; + trem--; + + /* + * Skip the while() loop. + */ + nlen = 0; + } + + while (labels > 0 && nlen > 0 && trem > 0) { + labels--; + count = *ndata++; + nlen--; + if (count == 0) + break; + if (count < 64) { + INSIST(nlen >= count); + while (count > 0) { + c = *ndata; + if ((c >= 0x30 && c <= 0x39) || /* digit */ + (c >= 0x41 && c <= 0x5A) || /* uppercase */ + (c >= 0x61 && c <= 0x7A) || /* lowercase */ + c == 0x2D || /* hyphen */ + c == 0x5F) /* underscore */ + { + if (trem == 0) + return (ISC_R_NOSPACE); + /* downcase */ + if (c >= 0x41 && c <= 0x5A) + c += 0x20; + CONVERTFROMASCII(c); + *tdata++ = c; + ndata++; + trem--; + nlen--; + } else { + if (trem < 3) + return (ISC_R_NOSPACE); + sprintf(tdata, "%%%02X", c); + tdata += 3; + trem -= 3; + ndata++; + nlen--; + } + count--; + } + } else { + FATAL_ERROR(__FILE__, __LINE__, + "Unexpected label type %02x", count); + /* NOTREACHED */ + } + + /* + * The following assumes names are absolute. If not, we + * fix things up later. Note that this means that in some + * cases one more byte of text buffer is required than is + * needed in the final output. + */ + if (trem == 0) + return (ISC_R_NOSPACE); + *tdata++ = '.'; + trem--; + } + + if (nlen != 0 && trem == 0) + return (ISC_R_NOSPACE); + + if (omit_final_dot) + trem++; + + isc_buffer_add(target, tlen - trem); + + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_name_downcase(dns_name_t *source, dns_name_t *name, isc_buffer_t *target) { + unsigned char *sndata, *ndata; + unsigned int nlen, count, labels; + isc_buffer_t buffer; + + /* + * Downcase 'source'. + */ + + REQUIRE(VALID_NAME(source)); + REQUIRE(VALID_NAME(name)); + if (source == name) { + REQUIRE((name->attributes & DNS_NAMEATTR_READONLY) == 0); + isc_buffer_init(&buffer, source->ndata, source->length); + target = &buffer; + ndata = source->ndata; + } else { + REQUIRE(BINDABLE(name)); + REQUIRE((target != NULL && ISC_BUFFER_VALID(target)) || + (target == NULL && ISC_BUFFER_VALID(name->buffer))); + if (target == NULL) { + target = name->buffer; + isc_buffer_clear(name->buffer); + } + ndata = (unsigned char *)target->base + target->used; + name->ndata = ndata; + } + + sndata = source->ndata; + nlen = source->length; + labels = source->labels; + + if (nlen > (target->length - target->used)) { + MAKE_EMPTY(name); + return (ISC_R_NOSPACE); + } + + while (labels > 0 && nlen > 0) { + labels--; + count = *sndata++; + *ndata++ = count; + nlen--; + if (count < 64) { + INSIST(nlen >= count); + while (count > 0) { + *ndata++ = maptolower[(*sndata++)]; + nlen--; + count--; + } + } else { + FATAL_ERROR(__FILE__, __LINE__, + "Unexpected label type %02x", count); + /* Does not return. */ + } + } + + if (source != name) { + name->labels = source->labels; + name->length = source->length; + if ((source->attributes & DNS_NAMEATTR_ABSOLUTE) != 0) + name->attributes = DNS_NAMEATTR_ABSOLUTE; + else + name->attributes = 0; + if (name->labels > 0 && name->offsets != NULL) + set_offsets(name, name->offsets, NULL); + } + + isc_buffer_add(target, name->length); + + return (ISC_R_SUCCESS); +} + +static void +set_offsets(const dns_name_t *name, unsigned char *offsets, + dns_name_t *set_name) +{ + unsigned int offset, count, length, nlabels; + unsigned char *ndata; + isc_boolean_t absolute; + + ndata = name->ndata; + length = name->length; + offset = 0; + nlabels = 0; + absolute = ISC_FALSE; + while (offset != length) { + INSIST(nlabels < 128); + offsets[nlabels++] = offset; + count = *ndata++; + offset++; + INSIST(count <= 63); + offset += count; + ndata += count; + INSIST(offset <= length); + if (count == 0) { + absolute = ISC_TRUE; + break; + } + } + if (set_name != NULL) { + INSIST(set_name == name); + + set_name->labels = nlabels; + set_name->length = offset; + if (absolute) + set_name->attributes |= DNS_NAMEATTR_ABSOLUTE; + else + set_name->attributes &= ~DNS_NAMEATTR_ABSOLUTE; + } + INSIST(nlabels == name->labels); + INSIST(offset == name->length); +} + +isc_result_t +dns_name_fromwire(dns_name_t *name, isc_buffer_t *source, + dns_decompress_t *dctx, unsigned int options, + isc_buffer_t *target) +{ + unsigned char *cdata, *ndata; + unsigned int cused; /* Bytes of compressed name data used */ + unsigned int nused, labels, n, nmax; + unsigned int current, new_current, biggest_pointer; + isc_boolean_t done; + fw_state state = fw_start; + unsigned int c; + unsigned char *offsets; + dns_offsets_t odata; + isc_boolean_t downcase; + isc_boolean_t seen_pointer; + + /* + * Copy the possibly-compressed name at source into target, + * decompressing it. Loop prevention is performed by checking + * the new pointer against biggest_pointer. + */ + + REQUIRE(VALID_NAME(name)); + REQUIRE((target != NULL && ISC_BUFFER_VALID(target)) || + (target == NULL && ISC_BUFFER_VALID(name->buffer))); + + downcase = ISC_TF((options & DNS_NAME_DOWNCASE) != 0); + + if (target == NULL && name->buffer != NULL) { + target = name->buffer; + isc_buffer_clear(target); + } + + REQUIRE(dctx != NULL); + REQUIRE(BINDABLE(name)); + + INIT_OFFSETS(name, offsets, odata); + + /* + * Make 'name' empty in case of failure. + */ + MAKE_EMPTY(name); + + /* + * Initialize things to make the compiler happy; they're not required. + */ + n = 0; + new_current = 0; + + /* + * Set up. + */ + labels = 0; + done = ISC_FALSE; + + ndata = isc_buffer_used(target); + nused = 0; + seen_pointer = ISC_FALSE; + + /* + * Find the maximum number of uncompressed target name + * bytes we are willing to generate. This is the smaller + * of the available target buffer length and the + * maximum legal domain name length (255). + */ + nmax = isc_buffer_availablelength(target); + if (nmax > DNS_NAME_MAXWIRE) + nmax = DNS_NAME_MAXWIRE; + + cdata = isc_buffer_current(source); + cused = 0; + + current = source->current; + biggest_pointer = current; + + /* + * Note: The following code is not optimized for speed, but + * rather for correctness. Speed will be addressed in the future. + */ + + while (current < source->active && !done) { + c = *cdata++; + current++; + if (!seen_pointer) + cused++; + + switch (state) { + case fw_start: + if (c < 64) { + offsets[labels] = nused; + labels++; + if (nused + c + 1 > nmax) + goto full; + nused += c + 1; + *ndata++ = c; + if (c == 0) + done = ISC_TRUE; + n = c; + state = fw_ordinary; + } else if (c >= 128 && c < 192) { + /* + * 14 bit local compression pointer. + * Local compression is no longer an + * IETF draft. + */ + return (DNS_R_BADLABELTYPE); + } else if (c >= 192) { + /* + * Ordinary 14-bit pointer. + */ + if ((dctx->allowed & DNS_COMPRESS_GLOBAL14) == + 0) + return (DNS_R_DISALLOWED); + new_current = c & 0x3F; + n = 1; + state = fw_newcurrent; + } else + return (DNS_R_BADLABELTYPE); + break; + case fw_ordinary: + if (downcase) + c = maptolower[c]; + /* FALLTHROUGH */ + case fw_copy: + *ndata++ = c; + n--; + if (n == 0) + state = fw_start; + break; + case fw_newcurrent: + new_current *= 256; + new_current += c; + n--; + if (n != 0) + break; + if (new_current >= biggest_pointer) + return (DNS_R_BADPOINTER); + biggest_pointer = new_current; + current = new_current; + cdata = (unsigned char *)source->base + current; + seen_pointer = ISC_TRUE; + state = fw_start; + break; + default: + FATAL_ERROR(__FILE__, __LINE__, + "Unknown state %d", state); + /* Does not return. */ + } + } + + if (!done) + return (ISC_R_UNEXPECTEDEND); + + name->ndata = (unsigned char *)target->base + target->used; + name->labels = labels; + name->length = nused; + name->attributes |= DNS_NAMEATTR_ABSOLUTE; + + isc_buffer_forward(source, cused); + isc_buffer_add(target, name->length); + + return (ISC_R_SUCCESS); + + full: + if (nmax == DNS_NAME_MAXWIRE) + /* + * The name did not fit even though we had a buffer + * big enough to fit a maximum-length name. + */ + return (DNS_R_NAMETOOLONG); + else + /* + * The name might fit if only the caller could give us a + * big enough buffer. + */ + return (ISC_R_NOSPACE); +} + +isc_result_t +dns_name_towire(const dns_name_t *name, dns_compress_t *cctx, + isc_buffer_t *target) +{ + unsigned int methods; + isc_uint16_t offset; + dns_name_t gp; /* Global compression prefix */ + isc_boolean_t gf; /* Global compression target found */ + isc_uint16_t go; /* Global compression offset */ + dns_offsets_t clo; + dns_name_t clname; + + /* + * Convert 'name' into wire format, compressing it as specified by the + * compression context 'cctx', and storing the result in 'target'. + */ + + REQUIRE(VALID_NAME(name)); + REQUIRE(cctx != NULL); + REQUIRE(ISC_BUFFER_VALID(target)); + + /* + * If 'name' doesn't have an offsets table, make a clone which + * has one. + */ + if (name->offsets == NULL) { + DNS_NAME_INIT(&clname, clo); + dns_name_clone(name, &clname); + name = &clname; + } + DNS_NAME_INIT(&gp, NULL); + + offset = target->used; /*XXX*/ + + methods = dns_compress_getmethods(cctx); + + if ((name->attributes & DNS_NAMEATTR_NOCOMPRESS) == 0 && + (methods & DNS_COMPRESS_GLOBAL14) != 0) + gf = dns_compress_findglobal(cctx, name, &gp, &go); + else + gf = ISC_FALSE; + + /* + * If the offset is too high for 14 bit global compression, we're + * out of luck. + */ + if (gf && go >= 0x4000) + gf = ISC_FALSE; + + /* + * Will the compression pointer reduce the message size? + */ + if (gf && (gp.length + 2) >= name->length) + gf = ISC_FALSE; + + if (gf) { + if (target->length - target->used < gp.length) + return (ISC_R_NOSPACE); + (void)memcpy((unsigned char *)target->base + target->used, + gp.ndata, (size_t)gp.length); + isc_buffer_add(target, gp.length); + go |= 0xc000; + if (target->length - target->used < 2) + return (ISC_R_NOSPACE); + isc_buffer_putuint16(target, go); + if (gp.length != 0) + dns_compress_add(cctx, name, &gp, offset); + } else { + if (target->length - target->used < name->length) + return (ISC_R_NOSPACE); + (void)memcpy((unsigned char *)target->base + target->used, + name->ndata, (size_t)name->length); + isc_buffer_add(target, name->length); + dns_compress_add(cctx, name, name, offset); + } + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_name_concatenate(dns_name_t *prefix, dns_name_t *suffix, dns_name_t *name, + isc_buffer_t *target) +{ + unsigned char *ndata, *offsets; + unsigned int nrem, labels, prefix_length, length; + isc_boolean_t copy_prefix = ISC_TRUE; + isc_boolean_t copy_suffix = ISC_TRUE; + isc_boolean_t absolute = ISC_FALSE; + dns_name_t tmp_name; + dns_offsets_t odata; + + /* + * Concatenate 'prefix' and 'suffix'. + */ + + REQUIRE(prefix == NULL || VALID_NAME(prefix)); + REQUIRE(suffix == NULL || VALID_NAME(suffix)); + REQUIRE(name == NULL || VALID_NAME(name)); + REQUIRE((target != NULL && ISC_BUFFER_VALID(target)) || + (target == NULL && name != NULL && ISC_BUFFER_VALID(name->buffer))); + if (prefix == NULL || prefix->labels == 0) + copy_prefix = ISC_FALSE; + if (suffix == NULL || suffix->labels == 0) + copy_suffix = ISC_FALSE; + if (copy_prefix && + (prefix->attributes & DNS_NAMEATTR_ABSOLUTE) != 0) { + absolute = ISC_TRUE; + REQUIRE(!copy_suffix); + } + if (name == NULL) { + DNS_NAME_INIT(&tmp_name, odata); + name = &tmp_name; + } + if (target == NULL) { + INSIST(name->buffer != NULL); + target = name->buffer; + isc_buffer_clear(name->buffer); + } + + REQUIRE(BINDABLE(name)); + + /* + * Set up. + */ + nrem = target->length - target->used; + ndata = (unsigned char *)target->base + target->used; + if (nrem > DNS_NAME_MAXWIRE) + nrem = DNS_NAME_MAXWIRE; + length = 0; + prefix_length = 0; + labels = 0; + if (copy_prefix) { + prefix_length = prefix->length; + length += prefix_length; + labels += prefix->labels; + } + if (copy_suffix) { + length += suffix->length; + labels += suffix->labels; + } + if (length > DNS_NAME_MAXWIRE) { + MAKE_EMPTY(name); + return (DNS_R_NAMETOOLONG); + } + if (length > nrem) { + MAKE_EMPTY(name); + return (ISC_R_NOSPACE); + } + + if (copy_suffix) { + if ((suffix->attributes & DNS_NAMEATTR_ABSOLUTE) != 0) + absolute = ISC_TRUE; + if (suffix == name && suffix->buffer == target) + memmove(ndata + prefix_length, suffix->ndata, + suffix->length); + else + memcpy(ndata + prefix_length, suffix->ndata, + suffix->length); + } + + /* + * If 'prefix' and 'name' are the same object, and the object has + * a dedicated buffer, and we're using it, then we don't have to + * copy anything. + */ + if (copy_prefix && (prefix != name || prefix->buffer != target)) + memcpy(ndata, prefix->ndata, prefix_length); + + name->ndata = ndata; + name->labels = labels; + name->length = length; + if (absolute) + name->attributes = DNS_NAMEATTR_ABSOLUTE; + else + name->attributes = 0; + + if (name->labels > 0 && name->offsets != NULL) { + INIT_OFFSETS(name, offsets, odata); + set_offsets(name, offsets, NULL); + } + + isc_buffer_add(target, name->length); + + return (ISC_R_SUCCESS); +} + +void +dns_name_split(dns_name_t *name, unsigned int suffixlabels, + dns_name_t *prefix, dns_name_t *suffix) + +{ + unsigned int splitlabel; + + REQUIRE(VALID_NAME(name)); + REQUIRE(suffixlabels > 0); + REQUIRE(suffixlabels < name->labels); + REQUIRE(prefix != NULL || suffix != NULL); + REQUIRE(prefix == NULL || + (VALID_NAME(prefix) && + prefix->buffer != NULL && + BINDABLE(prefix))); + REQUIRE(suffix == NULL || + (VALID_NAME(suffix) && + suffix->buffer != NULL && + BINDABLE(suffix))); + + splitlabel = name->labels - suffixlabels; + + if (prefix != NULL) + dns_name_getlabelsequence(name, 0, splitlabel, prefix); + + if (suffix != NULL) + dns_name_getlabelsequence(name, splitlabel, + suffixlabels, suffix); + + return; +} + +isc_result_t +dns_name_dup(const dns_name_t *source, isc_mem_t *mctx, + dns_name_t *target) +{ + /* + * Make 'target' a dynamically allocated copy of 'source'. + */ + + REQUIRE(VALID_NAME(source)); + REQUIRE(source->length > 0); + REQUIRE(VALID_NAME(target)); + REQUIRE(BINDABLE(target)); + + /* + * Make 'target' empty in case of failure. + */ + MAKE_EMPTY(target); + + target->ndata = isc_mem_get(mctx, source->length); + if (target->ndata == NULL) + return (ISC_R_NOMEMORY); + + memcpy(target->ndata, source->ndata, source->length); + + target->length = source->length; + target->labels = source->labels; + target->attributes = DNS_NAMEATTR_DYNAMIC; + if ((source->attributes & DNS_NAMEATTR_ABSOLUTE) != 0) + target->attributes |= DNS_NAMEATTR_ABSOLUTE; + if (target->offsets != NULL) { + if (source->offsets != NULL) + memcpy(target->offsets, source->offsets, + source->labels); + else + set_offsets(target, target->offsets, NULL); + } + + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_name_dupwithoffsets(dns_name_t *source, isc_mem_t *mctx, + dns_name_t *target) +{ + /* + * Make 'target' a read-only dynamically allocated copy of 'source'. + * 'target' will also have a dynamically allocated offsets table. + */ + + REQUIRE(VALID_NAME(source)); + REQUIRE(source->length > 0); + REQUIRE(VALID_NAME(target)); + REQUIRE(BINDABLE(target)); + REQUIRE(target->offsets == NULL); + + /* + * Make 'target' empty in case of failure. + */ + MAKE_EMPTY(target); + + target->ndata = isc_mem_get(mctx, source->length + source->labels); + if (target->ndata == NULL) + return (ISC_R_NOMEMORY); + + memcpy(target->ndata, source->ndata, source->length); + + target->length = source->length; + target->labels = source->labels; + target->attributes = DNS_NAMEATTR_DYNAMIC | DNS_NAMEATTR_DYNOFFSETS | + DNS_NAMEATTR_READONLY; + if ((source->attributes & DNS_NAMEATTR_ABSOLUTE) != 0) + target->attributes |= DNS_NAMEATTR_ABSOLUTE; + target->offsets = target->ndata + source->length; + if (source->offsets != NULL) + memcpy(target->offsets, source->offsets, source->labels); + else + set_offsets(target, target->offsets, NULL); + + return (ISC_R_SUCCESS); +} + +void +dns_name_free(dns_name_t *name, isc_mem_t *mctx) { + size_t size; + + /* + * Free 'name'. + */ + + REQUIRE(VALID_NAME(name)); + REQUIRE((name->attributes & DNS_NAMEATTR_DYNAMIC) != 0); + + size = name->length; + if ((name->attributes & DNS_NAMEATTR_DYNOFFSETS) != 0) + size += name->labels; + isc_mem_put(mctx, name->ndata, size); + dns_name_invalidate(name); +} + +isc_result_t +dns_name_digest(dns_name_t *name, dns_digestfunc_t digest, void *arg) { + dns_name_t downname; + unsigned char data[256]; + isc_buffer_t buffer; + isc_result_t result; + isc_region_t r; + + /* + * Send 'name' in DNSSEC canonical form to 'digest'. + */ + + REQUIRE(VALID_NAME(name)); + REQUIRE(digest != NULL); + + DNS_NAME_INIT(&downname, NULL); + isc_buffer_init(&buffer, data, sizeof(data)); + + result = dns_name_downcase(name, &downname, &buffer); + if (result != ISC_R_SUCCESS) + return (result); + + isc_buffer_usedregion(&buffer, &r); + + return ((digest)(arg, &r)); +} + +isc_boolean_t +dns_name_dynamic(dns_name_t *name) { + REQUIRE(VALID_NAME(name)); + + /* + * Returns whether there is dynamic memory associated with this name. + */ + + return ((name->attributes & DNS_NAMEATTR_DYNAMIC) != 0 ? + ISC_TRUE : ISC_FALSE); +} + +isc_result_t +dns_name_print(dns_name_t *name, FILE *stream) { + isc_result_t result; + isc_buffer_t b; + isc_region_t r; + char t[1024]; + + /* + * Print 'name' on 'stream'. + */ + + REQUIRE(VALID_NAME(name)); + + isc_buffer_init(&b, t, sizeof(t)); + result = dns_name_totext(name, ISC_FALSE, &b); + if (result != ISC_R_SUCCESS) + return (result); + isc_buffer_usedregion(&b, &r); + fprintf(stream, "%.*s", (int)r.length, (char *)r.base); + + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_name_settotextfilter(dns_name_totextfilter_t proc) { +#ifdef ISC_PLATFORM_USETHREADS + isc_result_t result; + dns_name_totextfilter_t *mem; + int res; + + result = totext_filter_proc_key_init(); + if (result != ISC_R_SUCCESS) + return (result); + + /* + * If we already have been here set / clear as appropriate. + * Otherwise allocate memory. + */ + mem = isc_thread_key_getspecific(totext_filter_proc_key); + if (mem != NULL && proc != NULL) { + *mem = proc; + return (ISC_R_SUCCESS); + } + if (proc == NULL) { + isc_mem_put(thread_key_mctx, mem, sizeof(*mem)); + res = isc_thread_key_setspecific(totext_filter_proc_key, NULL); + if (res != 0) + result = ISC_R_UNEXPECTED; + return (result); + } + + mem = isc_mem_get(thread_key_mctx, sizeof(*mem)); + if (mem == NULL) + return (ISC_R_NOMEMORY); + *mem = proc; + if (isc_thread_key_setspecific(totext_filter_proc_key, mem) != 0) { + isc_mem_put(thread_key_mctx, mem, sizeof(*mem)); + result = ISC_R_UNEXPECTED; + } + return (result); +#else + totext_filter_proc = proc; + return (ISC_R_SUCCESS); +#endif +} + +void +dns_name_format(dns_name_t *name, char *cp, unsigned int size) { + isc_result_t result; + isc_buffer_t buf; + + REQUIRE(size > 0); + + /* + * Leave room for null termination after buffer. + */ + isc_buffer_init(&buf, cp, size - 1); + result = dns_name_totext(name, ISC_TRUE, &buf); + if (result == ISC_R_SUCCESS) { + /* + * Null terminate. + */ + isc_region_t r; + isc_buffer_usedregion(&buf, &r); + ((char *) r.base)[r.length] = '\0'; + + } else + snprintf(cp, size, "<unknown>"); +} + +isc_result_t +dns_name_copy(dns_name_t *source, dns_name_t *dest, isc_buffer_t *target) { + unsigned char *ndata; + + /* + * Make dest a copy of source. + */ + + REQUIRE(VALID_NAME(source)); + REQUIRE(VALID_NAME(dest)); + REQUIRE(target != NULL || dest->buffer != NULL); + + if (target == NULL) { + target = dest->buffer; + isc_buffer_clear(dest->buffer); + } + + REQUIRE(BINDABLE(dest)); + + /* + * Set up. + */ + if (target->length - target->used < source->length) + return (ISC_R_NOSPACE); + + ndata = (unsigned char *)target->base + target->used; + dest->ndata = target->base; + + memcpy(ndata, source->ndata, source->length); + + dest->ndata = ndata; + dest->labels = source->labels; + dest->length = source->length; + if ((source->attributes & DNS_NAMEATTR_ABSOLUTE) != 0) + dest->attributes = DNS_NAMEATTR_ABSOLUTE; + else + dest->attributes = 0; + + if (dest->labels > 0 && dest->offsets != NULL) { + if (source->offsets != NULL) + memcpy(dest->offsets, source->offsets, source->labels); + else + set_offsets(dest, dest->offsets, NULL); + } + + isc_buffer_add(target, dest->length); + + return (ISC_R_SUCCESS); +} + +void +dns_name_destroy(void) { +#ifdef ISC_PLATFORM_USETHREADS + RUNTIME_CHECK(isc_once_do(&once, thread_key_mutex_init) + == ISC_R_SUCCESS); + + LOCK(&thread_key_mutex); + if (thread_key_initialized) { + isc_mem_detach(&thread_key_mctx); + isc_thread_key_delete(totext_filter_proc_key); + thread_key_initialized = 0; + } + UNLOCK(&thread_key_mutex); + +#endif +} |