331 lines
8 KiB
C
331 lines
8 KiB
C
![]() |
/* NeoStats - IRC Statistical Services
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** Copyright (c) 1999-2004 Adam Rutter, Justin Hammond
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** http://www.neostats.net/
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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** USA
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**
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** NeoStats CVS Identification
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** $Id$
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*/
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/*
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* transmit.c
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* - construct queries
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* - send queries
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*/
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/*
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* This file is
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* Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
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*
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* It is part of adns, which is
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* Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
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* Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include "internal.h"
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#include "tvarith.h"
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#define MKQUERY_START(vb) (rqp= (vb)->buf+(vb)->used)
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#define MKQUERY_ADDB(b) *rqp++= (b)
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#define MKQUERY_ADDW(w) (MKQUERY_ADDB(((w)>>8)&0x0ff), MKQUERY_ADDB((w)&0x0ff))
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#define MKQUERY_STOP(vb) ((vb)->used= rqp-(vb)->buf)
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static adns_status mkquery_header(adns_state ads, vbuf * vb, int *id_r,
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int qdlen)
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{
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int id;
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byte *rqp;
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if (!adns__vbuf_ensure(vb, DNS_HDRSIZE + qdlen + 4))
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return adns_s_nomemory;
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vb->used = 0;
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MKQUERY_START(vb);
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*id_r = id = (ads->nextid++) & 0x0ffff;
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MKQUERY_ADDW(id);
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MKQUERY_ADDB(0x01); /* QR=Q(0), OPCODE=QUERY(0000), !AA, !TC, RD */
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MKQUERY_ADDB(0x00); /* !RA, Z=000, RCODE=NOERROR(0000) */
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MKQUERY_ADDW(1); /* QDCOUNT=1 */
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MKQUERY_ADDW(0); /* ANCOUNT=0 */
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MKQUERY_ADDW(0); /* NSCOUNT=0 */
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MKQUERY_ADDW(0); /* ARCOUNT=0 */
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MKQUERY_STOP(vb);
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return adns_s_ok;
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}
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static adns_status mkquery_footer(vbuf * vb, adns_rrtype type)
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{
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byte *rqp;
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MKQUERY_START(vb);
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MKQUERY_ADDW(type & adns__rrt_typemask); /* QTYPE */
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MKQUERY_ADDW(DNS_CLASS_IN); /* QCLASS=IN */
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MKQUERY_STOP(vb);
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assert(vb->used <= vb->avail);
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return adns_s_ok;
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}
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adns_status adns__mkquery(adns_state ads, vbuf * vb, int *id_r,
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const char *owner, int ol,
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const typeinfo * typei, adns_queryflags flags)
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{
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int ll, c, nbytes;
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byte label[255], *rqp;
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const char *p, *pe;
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adns_status st;
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st = mkquery_header(ads, vb, id_r, ol + 2);
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if (st)
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return st;
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MKQUERY_START(vb);
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p = owner;
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pe = owner + ol;
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nbytes = 0;
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while (p != pe) {
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ll = 0;
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while (p != pe && (c = *p++) != '.') {
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if (c == '\\') {
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if (!(flags & adns_qf_quoteok_query))
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return adns_s_querydomaininvalid;
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if (ctype_digit(p[0])) {
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if (ctype_digit(p[1])
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&& ctype_digit(p[2])) {
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c = (p[0] - '0') * 100 +
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(p[1] - '0') * 10 +
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(p[2] - '0');
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p += 3;
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if (c >= 256)
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return
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adns_s_querydomaininvalid;
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} else {
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return
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adns_s_querydomaininvalid;
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}
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} else if (!(c = *p++)) {
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return adns_s_querydomaininvalid;
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}
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}
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if (!(flags & adns_qf_quoteok_query)) {
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if (c == '-') {
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if (!ll)
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return
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adns_s_querydomaininvalid;
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} else if (!ctype_alpha(c)
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&& !ctype_digit(c)) {
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return adns_s_querydomaininvalid;
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}
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}
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if (ll == sizeof(label))
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return adns_s_querydomaininvalid;
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label[ll++] = c;
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}
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if (!ll)
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return adns_s_querydomaininvalid;
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if (ll > DNS_MAXLABEL)
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return adns_s_querydomaintoolong;
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nbytes += ll + 1;
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if (nbytes >= DNS_MAXDOMAIN)
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return adns_s_querydomaintoolong;
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MKQUERY_ADDB(ll);
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memcpy(rqp, label, ll);
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rqp += ll;
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}
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MKQUERY_ADDB(0);
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MKQUERY_STOP(vb);
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st = mkquery_footer(vb, typei->type);
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return adns_s_ok;
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}
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adns_status adns__mkquery_frdgram(adns_state ads, vbuf * vb, int *id_r,
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const byte * qd_dgram, int qd_dglen,
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int qd_begin, adns_rrtype type,
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adns_queryflags flags)
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{
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byte *rqp;
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findlabel_state fls;
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int lablen, labstart;
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adns_status st;
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st = mkquery_header(ads, vb, id_r, qd_dglen);
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if (st)
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return st;
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MKQUERY_START(vb);
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adns__findlabel_start(&fls, ads, -1, 0, qd_dgram, qd_dglen,
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qd_dglen, qd_begin, 0);
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for (;;) {
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st = adns__findlabel_next(&fls, &lablen, &labstart);
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assert(!st);
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if (!lablen)
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break;
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assert(lablen < 255);
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MKQUERY_ADDB(lablen);
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memcpy(rqp, qd_dgram + labstart, lablen);
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rqp += lablen;
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}
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MKQUERY_ADDB(0);
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MKQUERY_STOP(vb);
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st = mkquery_footer(vb, type);
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return adns_s_ok;
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}
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void adns__querysend_tcp(adns_query qu, struct timeval now)
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{
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byte length[2];
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struct iovec iov[2];
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int wr, r;
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adns_state ads;
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if (qu->ads->tcpstate != server_ok)
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return;
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assert(qu->state == query_tcpw);
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length[0] = (qu->query_dglen & 0x0ff00U) >> 8;
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length[1] = (qu->query_dglen & 0x0ff);
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ads = qu->ads;
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if (!adns__vbuf_ensure
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(&ads->tcpsend, ads->tcpsend.used + qu->query_dglen + 2))
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return;
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qu->retries++;
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/* Reset idle timeout. */
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ads->tcptimeout.tv_sec = ads->tcptimeout.tv_usec = 0;
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if (ads->tcpsend.used) {
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wr = 0;
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} else {
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iov[0].iov_base = length;
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iov[0].iov_len = 2;
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iov[1].iov_base = qu->query_dgram;
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iov[1].iov_len = qu->query_dglen;
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adns__sigpipe_protect(qu->ads);
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wr = writev(qu->ads->tcpsocket, iov, 2);
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adns__sigpipe_unprotect(qu->ads);
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if (wr < 0) {
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if (!
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(errno == EAGAIN || errno == EINTR
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|| errno == ENOSPC || errno == ENOBUFS
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|| errno == ENOMEM)) {
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adns__tcp_broken(ads, "write",
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strerror(errno));
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return;
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}
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wr = 0;
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}
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}
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if (wr < 2) {
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r = adns__vbuf_append(&ads->tcpsend, length, 2 - wr);
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assert(r);
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wr = 0;
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} else {
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wr -= 2;
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}
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if (wr < qu->query_dglen) {
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r = adns__vbuf_append(&ads->tcpsend, qu->query_dgram + wr,
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qu->query_dglen - wr);
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assert(r);
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}
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}
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static void query_usetcp(adns_query qu, struct timeval now)
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{
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qu->state = query_tcpw;
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qu->timeout = now;
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timevaladd(&qu->timeout, TCPWAITMS);
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LIST_LINK_TAIL(qu->ads->tcpw, qu);
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adns__querysend_tcp(qu, now);
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adns__tcp_tryconnect(qu->ads, now);
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}
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void adns__query_send(adns_query qu, struct timeval now)
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{
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struct sockaddr_in servaddr;
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int serv, r;
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adns_state ads;
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assert(qu->state == query_tosend);
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if ((qu->flags & adns_qf_usevc) || (qu->query_dglen > DNS_MAXUDP)) {
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query_usetcp(qu, now);
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return;
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}
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if (qu->retries >= UDPMAXRETRIES) {
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adns__query_fail(qu, adns_s_timeout);
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return;
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}
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serv = qu->udpnextserver;
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memset(&servaddr, 0, sizeof(servaddr));
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ads = qu->ads;
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servaddr.sin_family = AF_INET;
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servaddr.sin_addr = ads->servers[serv].addr;
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servaddr.sin_port = htons(DNS_PORT);
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r = sendto(ads->udpsocket, qu->query_dgram, qu->query_dglen, 0,
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(const struct sockaddr *) &servaddr, sizeof(servaddr));
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if (r < 0 && errno == EMSGSIZE) {
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qu->retries = 0;
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query_usetcp(qu, now);
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return;
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}
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if (r < 0 && errno != EAGAIN)
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adns__warn(ads, serv, 0, "sendto failed: %s",
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strerror(errno));
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qu->timeout = now;
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timevaladd(&qu->timeout, UDPRETRYMS);
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qu->udpsent |= (1 << serv);
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qu->udpnextserver = (serv + 1) % ads->nservers;
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qu->retries++;
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LIST_LINK_TAIL(ads->udpw, qu);
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}
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