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And reformat to GNU style, and eliminate the labellen function. The symbol was moved using scripts/move-symbol-to-libc.py. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>codonell/c-utf8
Florian Weimer
5 years ago
69 changed files with 274 additions and 227 deletions
@ -0,0 +1,202 @@ |
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/* Compression of DNS domain names.
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
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* Copyright (c) 1996,1999 by Internet Software Consortium. |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <arpa/nameser.h> |
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#include <errno.h> |
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#include <string.h> |
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#include <shlib-compat.h> |
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/* Thinking in noninternationalized USASCII (per the DNS spec),
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convert this character to lower case if it's upper case. */ |
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static int |
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mklower (int ch) |
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{ |
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if (ch >= 'A' && ch <= 'Z') |
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return ch - 'A' + 'a'; |
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return ch; |
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} |
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/* Search for the counted-label name in an array of compressed names.
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Returns the offset from MSG if found, or -1. |
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DNPTRS is the pointer to the first name on the list, not the |
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pointer to the start of the message. */ |
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static int |
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dn_find (const unsigned char *domain, const unsigned char *msg, |
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const unsigned char **dnptrs, |
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const unsigned char **lastdnptr) |
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{ |
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const unsigned char *dn, *cp, *sp; |
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const unsigned char **cpp; |
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unsigned int n; |
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for (cpp = dnptrs; cpp < lastdnptr; cpp++) |
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{ |
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sp = *cpp; |
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/* Terminate search on: root label, compression pointer, unusable
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offset. */ |
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while (*sp != 0 && (*sp & NS_CMPRSFLGS) == 0 && (sp - msg) < 0x4000) |
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{ |
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dn = domain; |
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cp = sp; |
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while ((n = *cp++) != 0) |
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{ |
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/* Check for indirection. */ |
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switch (n & NS_CMPRSFLGS) |
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{ |
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case 0: /* Normal case, n == len. */ |
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if (n != *dn++) |
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goto next; |
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for (; n > 0; n--) |
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if (mklower (*dn++) != mklower (*cp++)) |
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goto next; |
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/* Is next root for both? */ |
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if (*dn == '\0' && *cp == '\0') |
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return sp - msg; |
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if (*dn) |
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continue; |
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goto next; |
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case NS_CMPRSFLGS: /* Indirection. */ |
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cp = msg + (((n & 0x3f) << 8) | *cp); |
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break; |
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default: /* Illegal type. */ |
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__set_errno (EMSGSIZE); |
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return -1; |
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} |
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} |
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next: ; |
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sp += *sp + 1; |
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} |
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} |
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__set_errno (ENOENT); |
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return -1; |
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} |
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/* Packs domain name SRC into DST. Returns size of the compressed
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name, or -1. |
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DNPTRS is an array of pointers to previous compressed names. |
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DNPTRS[0] is a pointer to the beginning of the message. The array |
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ends with NULL. LASTDNPTR is a pointer to the end of the array |
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pointed to by 'dnptrs'. |
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The list of pointers in DNPTRS is updated for labels inserted into |
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the message as we compress the name. If DNPTRS is NULL, we don't |
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try to compress names. If LASTDNPTR is NULL, we don't update the |
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list. */ |
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int |
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___ns_name_pack (const unsigned char *src, unsigned char *dst, int dstsiz, |
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const unsigned char **dnptrs, const unsigned char **lastdnptr) |
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{ |
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unsigned char *dstp; |
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const unsigned char **cpp, **lpp, *eob, *msg; |
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const unsigned char *srcp; |
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int n, l, first = 1; |
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srcp = src; |
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dstp = dst; |
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eob = dstp + dstsiz; |
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lpp = cpp = NULL; |
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if (dnptrs != NULL) |
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{ |
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if ((msg = *dnptrs++) != NULL) |
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{ |
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for (cpp = dnptrs; *cpp != NULL; cpp++) |
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; |
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lpp = cpp; /* End of list to search. */ |
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} |
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} |
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else |
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msg = NULL; |
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/* Make sure the domain we are about to add is legal. */ |
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l = 0; |
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do |
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{ |
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n = *srcp; |
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if (n >= 64) |
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{ |
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__set_errno (EMSGSIZE); |
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return -1; |
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} |
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l += n + 1; |
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if (l > MAXCDNAME) |
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{ |
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__set_errno (EMSGSIZE); |
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return -1; |
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} |
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srcp += n + 1; |
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} |
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while (n != 0); |
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/* from here on we need to reset compression pointer array on error */ |
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srcp = src; |
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do |
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{ |
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/* Look to see if we can use pointers. */ |
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n = *srcp; |
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if (n != 0 && msg != NULL) |
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{ |
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l = dn_find (srcp, msg, dnptrs, lpp); |
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if (l >= 0) |
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{ |
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if (eob - dstp <= 1) |
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goto cleanup; |
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*dstp++ = (l >> 8) | NS_CMPRSFLGS; |
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*dstp++ = l % 256; |
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return dstp - dst; |
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} |
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/* Not found, save it. */ |
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if (lastdnptr != NULL && cpp < lastdnptr - 1 |
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&& (dstp - msg) < 0x4000 && first) |
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{ |
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*cpp++ = dstp; |
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*cpp = NULL; |
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first = 0; |
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} |
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} |
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/* Copy label to buffer. */ |
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if (n >= 64) |
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/* Should not happen. */ |
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goto cleanup; |
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if (n + 1 > eob - dstp) |
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goto cleanup; |
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memcpy (dstp, srcp, n + 1); |
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srcp += n + 1; |
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dstp += n + 1; |
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} |
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while (n != 0); |
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if (dstp > eob) |
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{ |
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cleanup: |
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if (msg != NULL) |
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*lpp = NULL; |
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__set_errno (EMSGSIZE); |
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return -1; |
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} |
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return dstp - dst; |
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} |
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versioned_symbol (libc, ___ns_name_pack, ns_name_pack, GLIBC_2_34); |
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versioned_symbol (libc, ___ns_name_pack, __ns_name_pack, GLIBC_PRIVATE); |
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libc_hidden_ver (___ns_name_pack, __ns_name_pack) |
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#if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_9, GLIBC_2_34) |
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compat_symbol (libresolv, ___ns_name_pack, ns_name_pack, GLIBC_2_9); |
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#endif |
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