diff options
Diffstat (limited to 'deps/node/deps/cares/src/ares_expand_name.c')
| -rw-r--r-- | deps/node/deps/cares/src/ares_expand_name.c | 209 |
1 files changed, 0 insertions, 209 deletions
diff --git a/deps/node/deps/cares/src/ares_expand_name.c b/deps/node/deps/cares/src/ares_expand_name.c deleted file mode 100644 index 3a38e673..00000000 --- a/deps/node/deps/cares/src/ares_expand_name.c +++ /dev/null @@ -1,209 +0,0 @@ - -/* Copyright 1998, 2011 by the Massachusetts Institute of Technology. - * - * Permission to use, copy, modify, and distribute this - * software and its documentation for any purpose and without - * fee is hereby granted, provided that the above copyright - * notice appear in all copies and that both that copyright - * notice and this permission notice appear in supporting - * documentation, and that the name of M.I.T. not be used in - * advertising or publicity pertaining to distribution of the - * software without specific, written prior permission. - * M.I.T. makes no representations about the suitability of - * this software for any purpose. It is provided "as is" - * without express or implied warranty. - */ - -#include "ares_setup.h" - -#ifdef HAVE_NETINET_IN_H -# include <netinet/in.h> -#endif -#ifdef HAVE_ARPA_NAMESER_H -# include <arpa/nameser.h> -#else -# include "nameser.h" -#endif -#ifdef HAVE_ARPA_NAMESER_COMPAT_H -# include <arpa/nameser_compat.h> -#endif - -#include "ares.h" -#include "ares_nowarn.h" -#include "ares_private.h" /* for the memdebug */ - -/* Maximum number of indirections allowed for a name */ -#define MAX_INDIRS 50 - -static int name_length(const unsigned char *encoded, const unsigned char *abuf, - int alen); - -/* Expand an RFC1035-encoded domain name given by encoded. The - * containing message is given by abuf and alen. The result given by - * *s, which is set to a NUL-terminated allocated buffer. *enclen is - * set to the length of the encoded name (not the length of the - * expanded name; the goal is to tell the caller how many bytes to - * move forward to get past the encoded name). - * - * In the simple case, an encoded name is a series of labels, each - * composed of a one-byte length (limited to values between 0 and 63 - * inclusive) followed by the label contents. The name is terminated - * by a zero-length label. - * - * In the more complicated case, a label may be terminated by an - * indirection pointer, specified by two bytes with the high bits of - * the first byte (corresponding to INDIR_MASK) set to 11. With the - * two high bits of the first byte stripped off, the indirection - * pointer gives an offset from the beginning of the containing - * message with more labels to decode. Indirection can happen an - * arbitrary number of times, so we have to detect loops. - * - * Since the expanded name uses '.' as a label separator, we use - * backslashes to escape periods or backslashes in the expanded name. - */ - -int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf, - int alen, char **s, long *enclen) -{ - int len, indir = 0; - char *q; - const unsigned char *p; - union { - ares_ssize_t sig; - size_t uns; - } nlen; - - nlen.sig = name_length(encoded, abuf, alen); - if (nlen.sig < 0) - return ARES_EBADNAME; - - *s = ares_malloc(nlen.uns + 1); - if (!*s) - return ARES_ENOMEM; - q = *s; - - if (nlen.uns == 0) { - /* RFC2181 says this should be ".": the root of the DNS tree. - * Since this function strips trailing dots though, it becomes "" - */ - q[0] = '\0'; - - /* indirect root label (like 0xc0 0x0c) is 2 bytes long (stupid, but - valid) */ - if ((*encoded & INDIR_MASK) == INDIR_MASK) - *enclen = 2L; - else - *enclen = 1L; /* the caller should move one byte to get past this */ - - return ARES_SUCCESS; - } - - /* No error-checking necessary; it was all done by name_length(). */ - p = encoded; - while (*p) - { - if ((*p & INDIR_MASK) == INDIR_MASK) - { - if (!indir) - { - *enclen = aresx_uztosl(p + 2U - encoded); - indir = 1; - } - p = abuf + ((*p & ~INDIR_MASK) << 8 | *(p + 1)); - } - else - { - len = *p; - p++; - while (len--) - { - if (*p == '.' || *p == '\\') - *q++ = '\\'; - *q++ = *p; - p++; - } - *q++ = '.'; - } - } - if (!indir) - *enclen = aresx_uztosl(p + 1U - encoded); - - /* Nuke the trailing period if we wrote one. */ - if (q > *s) - *(q - 1) = 0; - else - *q = 0; /* zero terminate; LCOV_EXCL_LINE: empty names exit above */ - - return ARES_SUCCESS; -} - -/* Return the length of the expansion of an encoded domain name, or - * -1 if the encoding is invalid. - */ -static int name_length(const unsigned char *encoded, const unsigned char *abuf, - int alen) -{ - int n = 0, offset, indir = 0, top; - - /* Allow the caller to pass us abuf + alen and have us check for it. */ - if (encoded >= abuf + alen) - return -1; - - while (*encoded) - { - top = (*encoded & INDIR_MASK); - if (top == INDIR_MASK) - { - /* Check the offset and go there. */ - if (encoded + 1 >= abuf + alen) - return -1; - offset = (*encoded & ~INDIR_MASK) << 8 | *(encoded + 1); - if (offset >= alen) - return -1; - encoded = abuf + offset; - - /* If we've seen more indirects than the message length, - * then there's a loop. - */ - ++indir; - if (indir > alen || indir > MAX_INDIRS) - return -1; - } - else if (top == 0x00) - { - offset = *encoded; - if (encoded + offset + 1 >= abuf + alen) - return -1; - encoded++; - while (offset--) - { - n += (*encoded == '.' || *encoded == '\\') ? 2 : 1; - encoded++; - } - n++; - } - else - { - /* RFC 1035 4.1.4 says other options (01, 10) for top 2 - * bits are reserved. - */ - return -1; - } - } - - /* If there were any labels at all, then the number of dots is one - * less than the number of labels, so subtract one. - */ - return (n) ? n - 1 : n; -} - -/* Like ares_expand_name but returns EBADRESP in case of invalid input. */ -int ares__expand_name_for_response(const unsigned char *encoded, - const unsigned char *abuf, int alen, - char **s, long *enclen) -{ - int status = ares_expand_name(encoded, abuf, alen, s, enclen); - if (status == ARES_EBADNAME) - status = ARES_EBADRESP; - return status; -} |