diff options
Diffstat (limited to 'deps/node/deps/cares/src/ares_create_query.c')
| -rw-r--r-- | deps/node/deps/cares/src/ares_create_query.c | 206 |
1 files changed, 0 insertions, 206 deletions
diff --git a/deps/node/deps/cares/src/ares_create_query.c b/deps/node/deps/cares/src/ares_create_query.c deleted file mode 100644 index 9efce17c..00000000 --- a/deps/node/deps/cares/src/ares_create_query.c +++ /dev/null @@ -1,206 +0,0 @@ - -/* Copyright 1998 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_dns.h" -#include "ares_private.h" - -#ifndef T_OPT -# define T_OPT 41 /* EDNS0 option (meta-RR) */ -#endif - -/* Header format, from RFC 1035: - * 1 1 1 1 1 1 - * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | ID | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * |QR| Opcode |AA|TC|RD|RA| Z | RCODE | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | QDCOUNT | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | ANCOUNT | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | NSCOUNT | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | ARCOUNT | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * - * AA, TC, RA, and RCODE are only set in responses. Brief description - * of the remaining fields: - * ID Identifier to match responses with queries - * QR Query (0) or response (1) - * Opcode For our purposes, always QUERY - * RD Recursion desired - * Z Reserved (zero) - * QDCOUNT Number of queries - * ANCOUNT Number of answers - * NSCOUNT Number of name server records - * ARCOUNT Number of additional records - * - * Question format, from RFC 1035: - * 1 1 1 1 1 1 - * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | | - * / QNAME / - * / / - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | QTYPE | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * | QCLASS | - * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - * - * The query name is encoded as a series of labels, each represented - * as a one-byte length (maximum 63) followed by the text of the - * label. The list is terminated by a label of length zero (which can - * be thought of as the root domain). - */ - -int ares_create_query(const char *name, int dnsclass, int type, - unsigned short id, int rd, unsigned char **bufp, - int *buflenp, int max_udp_size) -{ - size_t len; - unsigned char *q; - const char *p; - size_t buflen; - unsigned char *buf; - - /* Set our results early, in case we bail out early with an error. */ - *buflenp = 0; - *bufp = NULL; - - /* Per RFC 7686, reject queries for ".onion" domain names with NXDOMAIN. */ - if (ares__is_onion_domain(name)) - return ARES_ENOTFOUND; - - /* Allocate a memory area for the maximum size this packet might need. +2 - * is for the length byte and zero termination if no dots or ecscaping is - * used. - */ - len = strlen(name) + 2 + HFIXEDSZ + QFIXEDSZ + - (max_udp_size ? EDNSFIXEDSZ : 0); - buf = ares_malloc(len); - if (!buf) - return ARES_ENOMEM; - - /* Set up the header. */ - q = buf; - memset(q, 0, HFIXEDSZ); - DNS_HEADER_SET_QID(q, id); - DNS_HEADER_SET_OPCODE(q, QUERY); - if (rd) { - DNS_HEADER_SET_RD(q, 1); - } - else { - DNS_HEADER_SET_RD(q, 0); - } - DNS_HEADER_SET_QDCOUNT(q, 1); - - if (max_udp_size) { - DNS_HEADER_SET_ARCOUNT(q, 1); - } - - /* A name of "." is a screw case for the loop below, so adjust it. */ - if (strcmp(name, ".") == 0) - name++; - - /* Start writing out the name after the header. */ - q += HFIXEDSZ; - while (*name) - { - if (*name == '.') { - ares_free (buf); - return ARES_EBADNAME; - } - - /* Count the number of bytes in this label. */ - len = 0; - for (p = name; *p && *p != '.'; p++) - { - if (*p == '\\' && *(p + 1) != 0) - p++; - len++; - } - if (len > MAXLABEL) { - ares_free (buf); - return ARES_EBADNAME; - } - - /* Encode the length and copy the data. */ - *q++ = (unsigned char)len; - for (p = name; *p && *p != '.'; p++) - { - if (*p == '\\' && *(p + 1) != 0) - p++; - *q++ = *p; - } - - /* Go to the next label and repeat, unless we hit the end. */ - if (!*p) - break; - name = p + 1; - } - - /* Add the zero-length label at the end. */ - *q++ = 0; - - /* Finish off the question with the type and class. */ - DNS_QUESTION_SET_TYPE(q, type); - DNS_QUESTION_SET_CLASS(q, dnsclass); - - q += QFIXEDSZ; - if (max_udp_size) - { - memset(q, 0, EDNSFIXEDSZ); - q++; - DNS_RR_SET_TYPE(q, T_OPT); - DNS_RR_SET_CLASS(q, max_udp_size); - q += (EDNSFIXEDSZ-1); - } - buflen = (q - buf); - - /* Reject names that are longer than the maximum of 255 bytes that's - * specified in RFC 1035 ("To simplify implementations, the total length of - * a domain name (i.e., label octets and label length octets) is restricted - * to 255 octets or less."). */ - if (buflen > (size_t)(MAXCDNAME + HFIXEDSZ + QFIXEDSZ + - (max_udp_size ? EDNSFIXEDSZ : 0))) { - ares_free (buf); - return ARES_EBADNAME; - } - - /* we know this fits in an int at this point */ - *buflenp = (int) buflen; - *bufp = buf; - - return ARES_SUCCESS; -} |