diff options
Diffstat (limited to 'REORG.TODO/resolv/res_mkquery.c')
| -rw-r--r-- | REORG.TODO/resolv/res_mkquery.c | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/REORG.TODO/resolv/res_mkquery.c b/REORG.TODO/resolv/res_mkquery.c new file mode 100644 index 0000000000..8279d15de4 --- /dev/null +++ b/REORG.TODO/resolv/res_mkquery.c @@ -0,0 +1,268 @@ +/* + * Copyright (c) 1985, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * Portions Copyright (c) 1993 by Digital Equipment Corporation. + * + * 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, and that + * the name of Digital Equipment Corporation not be used in advertising or + * publicity pertaining to distribution of the document or software without + * specific, written prior permission. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL + * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT + * CORPORATION 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. + */ + +/* + * Portions Copyright (c) 1996-1999 by 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE + * CONSORTIUM 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. + */ + +#include <sys/types.h> +#include <sys/param.h> +#include <netinet/in.h> +#include <arpa/nameser.h> +#include <netdb.h> +#include <resolv/resolv-internal.h> +#include <stdio.h> +#include <string.h> +#include <sys/time.h> + +/* Options. Leave them on. */ +/* #define DEBUG */ + +#include <hp-timing.h> +#include <stdint.h> +#if HP_TIMING_AVAIL +# define RANDOM_BITS(Var) { uint64_t v64; HP_TIMING_NOW (v64); Var = v64; } +#endif + +/* + * Form all types of queries. + * Returns the size of the result or -1. + */ +int +res_nmkquery(res_state statp, + int op, /* opcode of query */ + const char *dname, /* domain name */ + int class, int type, /* class and type of query */ + const u_char *data, /* resource record data */ + int datalen, /* length of data */ + const u_char *newrr_in, /* new rr for modify or append */ + u_char *buf, /* buffer to put query */ + int buflen) /* size of buffer */ +{ + HEADER *hp; + u_char *cp; + int n; + u_char *dnptrs[20], **dpp, **lastdnptr; + + if (class < 0 || class > 65535 + || type < 0 || type > 65535) + return -1; + +#ifdef DEBUG + if (statp->options & RES_DEBUG) + printf(";; res_nmkquery(%s, %s, %s, %s)\n", + _res_opcodes[op], dname, p_class(class), p_type(type)); +#endif + /* + * Initialize header fields. + */ + if ((buf == NULL) || (buflen < HFIXEDSZ)) + return (-1); + memset(buf, 0, HFIXEDSZ); + hp = (HEADER *) buf; + /* We randomize the IDs every time. The old code just + incremented by one after the initial randomization which + still predictable if the application does multiple + requests. */ + int randombits; + do + { +#ifdef RANDOM_BITS + RANDOM_BITS (randombits); +#else + struct timeval tv; + __gettimeofday (&tv, NULL); + randombits = (tv.tv_sec << 8) ^ tv.tv_usec; +#endif + } + while ((randombits & 0xffff) == 0); + statp->id = (statp->id + randombits) & 0xffff; + hp->id = statp->id; + hp->opcode = op; + hp->rd = (statp->options & RES_RECURSE) != 0; + hp->rcode = NOERROR; + cp = buf + HFIXEDSZ; + buflen -= HFIXEDSZ; + dpp = dnptrs; + *dpp++ = buf; + *dpp++ = NULL; + lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; + /* + * perform opcode specific processing + */ + switch (op) { + case NS_NOTIFY_OP: + if ((buflen -= QFIXEDSZ + (data == NULL ? 0 : RRFIXEDSZ)) < 0) + return (-1); + goto compose; + + case QUERY: + if ((buflen -= QFIXEDSZ) < 0) + return (-1); + compose: + n = ns_name_compress(dname, cp, buflen, + (const u_char **) dnptrs, + (const u_char **) lastdnptr); + if (n < 0) + return (-1); + cp += n; + buflen -= n; + NS_PUT16 (type, cp); + NS_PUT16 (class, cp); + hp->qdcount = htons(1); + if (op == QUERY || data == NULL) + break; + /* + * Make an additional record for completion domain. + */ + n = ns_name_compress((char *)data, cp, buflen, + (const u_char **) dnptrs, + (const u_char **) lastdnptr); + if (__glibc_unlikely (n < 0)) + return (-1); + cp += n; + buflen -= n; + NS_PUT16 (T_NULL, cp); + NS_PUT16 (class, cp); + NS_PUT32 (0, cp); + NS_PUT16 (0, cp); + hp->arcount = htons(1); + break; + + default: + return (-1); + } + return (cp - buf); +} +libresolv_hidden_def (res_nmkquery) + + +/* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ +#ifndef T_OPT +#define T_OPT 41 +#endif + +int +__res_nopt(res_state statp, + int n0, /* current offset in buffer */ + u_char *buf, /* buffer to put query */ + int buflen, /* size of buffer */ + int anslen) /* UDP answer buffer size */ +{ + u_int16_t flags = 0; + +#ifdef DEBUG + if ((statp->options & RES_DEBUG) != 0U) + printf(";; res_nopt()\n"); +#endif + + HEADER *hp = (HEADER *) buf; + u_char *cp = buf + n0; + u_char *ep = buf + buflen; + + if ((ep - cp) < 1 + RRFIXEDSZ) + return -1; + + *cp++ = 0; /* "." */ + + NS_PUT16(T_OPT, cp); /* TYPE */ + + /* Lowering the advertised buffer size based on the actual + answer buffer size is desirable because the server will + minimize the reply to fit into the UDP packet (and A + non-minimal response might not fit the buffer). + + The RESOLV_EDNS_BUFFER_SIZE limit could still result in TCP + fallback and a non-minimal response which has to be + hard-truncated in the stub resolver, but this is price to + pay for avoiding fragmentation. (This issue does not + affect the nss_dns functions because they use the stub + resolver in such a way that it allocates a properly sized + response buffer.) */ + { + uint16_t buffer_size; + if (anslen < 512) + buffer_size = 512; + else if (anslen > RESOLV_EDNS_BUFFER_SIZE) + buffer_size = RESOLV_EDNS_BUFFER_SIZE; + else + buffer_size = anslen; + NS_PUT16 (buffer_size, cp); + } + + *cp++ = NOERROR; /* extended RCODE */ + *cp++ = 0; /* EDNS version */ + + if (statp->options & RES_USE_DNSSEC) { +#ifdef DEBUG + if (statp->options & RES_DEBUG) + printf(";; res_opt()... ENDS0 DNSSEC\n"); +#endif + flags |= NS_OPT_DNSSEC_OK; + } + + NS_PUT16(flags, cp); + NS_PUT16(0, cp); /* RDLEN */ + hp->arcount = htons(ntohs(hp->arcount) + 1); + + return cp - buf; +} |