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1 files changed, 257 insertions, 0 deletions

diff --git a/adns-0.6/src/transmit.c b/adns-0.6/src/transmit.c
new file mode 100644
index 0000000..c669af6
--- /dev/null
+++ b/adns-0.6/src/transmit.c
@@ -0,0 +1,257 @@
+/*
+ * transmit.c
+ * - construct queries
+ * - send queries
+ */
+/*
+ *  This file is
+ *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
+ *
+ *  It is part of adns, which is
+ *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
+ *    Copyright (C) 1999 Tony Finch <dot@dotat.at>
+ *  
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *  
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software Foundation,
+ *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
+ */
+
+#include <errno.h>
+
+#include <sys/types.h>
+#include <sys/uio.h>
+
+#include "internal.h"
+#include "tvarith.h"
+
+#define MKQUERY_START(vb) (rqp= (vb)->buf+(vb)->used)
+#define MKQUERY_ADDB(b) *rqp++= (b)
+#define MKQUERY_ADDW(w) (MKQUERY_ADDB(((w)>>8)&0x0ff), MKQUERY_ADDB((w)&0x0ff))
+#define MKQUERY_STOP(vb) ((vb)->used= rqp-(vb)->buf)
+
+static adns_status mkquery_header(adns_state ads, vbuf *vb, int *id_r, int qdlen) {
+  int id;
+  byte *rqp;
+  
+  if (!adns__vbuf_ensure(vb,DNS_HDRSIZE+qdlen+4)) return adns_s_nomemory;
+
+  vb->used= 0;
+  MKQUERY_START(vb);
+  
+  *id_r= id= (ads->nextid++) & 0x0ffff;
+  MKQUERY_ADDW(id);
+  MKQUERY_ADDB(0x01); /* QR=Q(0), OPCODE=QUERY(0000), !AA, !TC, RD */
+  MKQUERY_ADDB(0x00); /* !RA, Z=000, RCODE=NOERROR(0000) */
+  MKQUERY_ADDW(1); /* QDCOUNT=1 */
+  MKQUERY_ADDW(0); /* ANCOUNT=0 */
+  MKQUERY_ADDW(0); /* NSCOUNT=0 */
+  MKQUERY_ADDW(0); /* ARCOUNT=0 */
+
+  MKQUERY_STOP(vb);
+  
+  return adns_s_ok;
+}
+
+static adns_status mkquery_footer(vbuf *vb, adns_rrtype type) {
+  byte *rqp;
+
+  MKQUERY_START(vb);
+  MKQUERY_ADDW(type & adns__rrt_typemask); /* QTYPE */
+  MKQUERY_ADDW(DNS_CLASS_IN); /* QCLASS=IN */
+  MKQUERY_STOP(vb);
+  assert(vb->used <= vb->avail);
+  
+  return adns_s_ok;
+}
+
+adns_status adns__mkquery(adns_state ads, vbuf *vb, int *id_r,
+			  const char *owner, int ol,
+			  const typeinfo *typei, adns_queryflags flags) {
+  int ll, c, nlabs;
+  byte label[255], *rqp;
+  const char *p, *pe;
+  adns_status st;
+
+  st= mkquery_header(ads,vb,id_r,ol+2); if (st) return st;
+  
+  MKQUERY_START(vb);
+
+  p= owner; pe= owner+ol;
+  nlabs= 0;
+  while (p!=pe) {
+    ll= 0;
+    while (p!=pe && (c= *p++)!='.') {
+      if (c=='\\') {
+	if (!(flags & adns_qf_quoteok_query)) return adns_s_querydomaininvalid;
+	if (ctype_digit(p[0])) {
+	  if (ctype_digit(p[1]) && ctype_digit(p[2])) {
+	    c= (*p++ - '0')*100 + (*p++ - '0')*10 + (*p++ - '0');
+	    if (c >= 256) return adns_s_querydomaininvalid;
+	  } else {
+	    return adns_s_querydomaininvalid;
+	  }
+	} else if (!(c= *p++)) {
+	  return adns_s_querydomaininvalid;
+	}
+      }
+      if (!(flags & adns_qf_quoteok_query)) {
+	if (c == '-') {
+	  if (!ll) return adns_s_querydomaininvalid;
+	} else if (!ctype_alpha(c) && !ctype_digit(c)) {
+	  return adns_s_querydomaininvalid;
+	}
+      }
+      if (ll == sizeof(label)) return adns_s_querydomaininvalid;
+      label[ll++]= c;
+    }
+    if (!ll) return adns_s_querydomaininvalid;
+    if (nlabs++ > 63) return adns_s_querydomaintoolong;
+    MKQUERY_ADDB(ll);
+    memcpy(rqp,label,ll); rqp+= ll;
+  }
+  MKQUERY_ADDB(0);
+
+  MKQUERY_STOP(vb);
+  
+  st= mkquery_footer(vb,typei->type);
+  
+  return adns_s_ok;
+}
+
+adns_status adns__mkquery_frdgram(adns_state ads, vbuf *vb, int *id_r,
+				  const byte *qd_dgram, int qd_dglen, int qd_begin,
+				  adns_rrtype type, adns_queryflags flags) {
+  byte *rqp;
+  findlabel_state fls;
+  int lablen, labstart;
+  adns_status st;
+
+  st= mkquery_header(ads,vb,id_r,qd_dglen); if (st) return st;
+
+  MKQUERY_START(vb);
+
+  adns__findlabel_start(&fls,ads,-1,0,qd_dgram,qd_dglen,qd_dglen,qd_begin,0);
+  for (;;) {
+    st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
+    if (!lablen) break;
+    assert(lablen<255);
+    MKQUERY_ADDB(lablen);
+    memcpy(rqp,qd_dgram+labstart,lablen);
+    rqp+= lablen;
+  }
+  MKQUERY_ADDB(0);
+
+  MKQUERY_STOP(vb);
+  
+  st= mkquery_footer(vb,type);
+  
+  return adns_s_ok;
+}
+
+void adns__querysend_tcp(adns_query qu, struct timeval now) {
+  byte length[2];
+  struct iovec iov[2];
+  int wr, r;
+  adns_state ads;
+
+  if (qu->ads->tcpstate != server_ok) return;
+
+  assert(qu->state == query_tcpw);
+
+  length[0]= (qu->query_dglen&0x0ff00U) >>8;
+  length[1]= (qu->query_dglen&0x0ff);
+
+  ads= qu->ads;
+  if (!adns__vbuf_ensure(&ads->tcpsend,ads->tcpsend.used+qu->query_dglen+2)) return;
+
+  qu->retries++;
+
+  /* Reset idle timeout. */
+  ads->tcptimeout.tv_sec= ads->tcptimeout.tv_usec= 0;
+
+  if (ads->tcpsend.used) {
+    wr= 0;
+  } else {
+    iov[0].iov_base= length;
+    iov[0].iov_len= 2;
+    iov[1].iov_base= qu->query_dgram;
+    iov[1].iov_len= qu->query_dglen;
+    adns__sigpipe_protect(qu->ads);
+    wr= writev(qu->ads->tcpsocket,iov,2);
+    adns__sigpipe_unprotect(qu->ads);
+    if (wr < 0) {
+      if (!(errno == EAGAIN || errno == EINTR || errno == ENOSPC ||
+	    errno == ENOBUFS || errno == ENOMEM)) {
+	adns__tcp_broken(ads,"write",strerror(errno));
+	return;
+      }
+      wr= 0;
+    }
+  }
+
+  if (wr<2) {
+    r= adns__vbuf_append(&ads->tcpsend,length,2-wr); assert(r);
+    wr= 0;
+  } else {
+    wr-= 2;
+  }
+  if (wr<qu->query_dglen) {
+    r= adns__vbuf_append(&ads->tcpsend,qu->query_dgram+wr,qu->query_dglen-wr); assert(r);
+  }
+}
+
+static void query_usetcp(adns_query qu, struct timeval now) {
+  qu->state= query_tcpw;
+  qu->timeout= now;
+  timevaladd(&qu->timeout,TCPWAITMS);
+  LIST_LINK_TAIL(qu->ads->tcpw,qu);
+  adns__querysend_tcp(qu,now);
+  adns__tcp_tryconnect(qu->ads,now);
+}
+
+void adns__query_send(adns_query qu, struct timeval now) {
+  struct sockaddr_in servaddr;
+  int serv, r;
+  adns_state ads;
+
+  assert(qu->state == query_tosend);
+  if ((qu->flags & adns_qf_usevc) || (qu->query_dglen > DNS_MAXUDP)) {
+    query_usetcp(qu,now);
+    return;
+  }
+
+  if (qu->retries >= UDPMAXRETRIES) {
+    adns__query_fail(qu,adns_s_timeout);
+    return;
+  }
+
+  serv= qu->udpnextserver;
+  memset(&servaddr,0,sizeof(servaddr));
+
+  ads= qu->ads;
+  servaddr.sin_family= AF_INET;
+  servaddr.sin_addr= ads->servers[serv].addr;
+  servaddr.sin_port= htons(DNS_PORT);
+  
+  r= sendto(ads->udpsocket,qu->query_dgram,qu->query_dglen,0,
+	    (const struct sockaddr*)&servaddr,sizeof(servaddr));
+  if (r<0 && errno == EMSGSIZE) { qu->retries= 0; query_usetcp(qu,now); return; }
+  if (r<0) adns__warn(ads,serv,0,"sendto failed: %s",strerror(errno));
+  
+  qu->timeout= now;
+  timevaladd(&qu->timeout,UDPRETRYMS);
+  qu->udpsent |= (1<<serv);
+  qu->udpnextserver= (serv+1)%ads->nservers;
+  qu->retries++;
+  LIST_LINK_TAIL(ads->udpw,qu);
+}