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Create a branch for header work.
svn path=/branches/header-work/; revision=45691
This commit is contained in:
Timo Kreuzer
parent
14fe274b1c
commit
9ea495ba33
19538 changed files with 0 additions and 1063950 deletions
269
lib/3rdparty/adns/src/transmit.c
vendored
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269
lib/3rdparty/adns/src/transmit.c
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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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#ifdef ADNS_JGAA_WIN32
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# include "adns_win32.h"
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#else
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# include <sys/types.h>
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# include <sys/uio.h>
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#endif
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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, int qdlen) {
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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)) 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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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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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); if (st) return st;
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MKQUERY_START(vb);
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p= owner; 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)) return adns_s_querydomaininvalid;
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if (ctype_digit(p[0])) {
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if (ctype_digit(p[1]) && ctype_digit(p[2])) {
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c= (p[0] - '0')*100 + (p[1] - '0')*10 + (p[2] - '0');
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p += 3;
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if (c >= 256) return adns_s_querydomaininvalid;
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} else {
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return 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) return adns_s_querydomaininvalid;
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} else if (!ctype_alpha(c) && !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)) return adns_s_querydomaininvalid;
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label[ll++]= c;
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}
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if (!ll) return adns_s_querydomaininvalid;
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if (ll > DNS_MAXLABEL) return adns_s_querydomaintoolong;
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nbytes+= ll+1;
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if (nbytes >= DNS_MAXDOMAIN) return adns_s_querydomaintoolong;
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MKQUERY_ADDB(ll);
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memcpy(rqp,label,(size_t) ll); 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, int qd_begin,
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adns_rrtype type, adns_queryflags flags) {
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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); if (st) return st;
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MKQUERY_START(vb);
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adns__findlabel_start(&fls,ads,-1,0,qd_dgram,qd_dglen,qd_dglen,qd_begin,0);
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for (;;) {
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st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
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if (!lablen) break;
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assert(lablen<255);
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MKQUERY_ADDB(lablen);
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memcpy(rqp,qd_dgram+labstart, (size_t) 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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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) 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(&ads->tcpsend,ads->tcpsend.used+qu->query_dglen+2)) 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= (char*)length;
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iov[0].iov_len= 2;
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iov[1].iov_base= (char*)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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ADNS_CLEAR_ERRNO;
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wr= writev(qu->ads->tcpsocket,iov,2);
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ADNS_CAPTURE_ERRNO;
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adns__sigpipe_unprotect(qu->ads);
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if (wr < 0) {
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if (!(errno == EAGAIN || EWOULDBLOCK || errno == EINTR || errno == ENOSPC ||
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errno == ENOBUFS || errno == ENOMEM)) {
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adns__tcp_broken(ads,"write",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); 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,qu->query_dglen-wr); 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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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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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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ADNS_CLEAR_ERRNO;
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r= sendto(ads->udpsocket,(char*)qu->query_dgram,qu->query_dglen,0,
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(const struct sockaddr*)&servaddr,sizeof(servaddr));
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ADNS_CAPTURE_ERRNO;
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if (r<0 && errno == EMSGSIZE) { qu->retries= 0; query_usetcp(qu,now); return; }
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if (r<0 && ((errno != EAGAIN) && (errno != EWOULDBLOCK))) adns__warn(ads,serv,0,"sendto failed: %s (%d)",strerror(errno), 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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