[adns] / src / transmit.c

/*
 * 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);
}
Commit	Line	Data
98db6da3	1	/*
	2	* transmit.c
	3	* - construct queries
	4	* - send queries
	5	*/
	6	/*
a79ac5ba	7	* This file is
	8	* Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
	9	*
	10	* It is part of adns, which is
	11	* Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
	12	* Copyright (C) 1999 Tony Finch <dot@dotat.at>
98db6da3	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2, or (at your option)
	17	* any later version.
	18	*
	19	* This program is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with this program; if not, write to the Free Software Foundation,
	26	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	27	*/
	28
11c8bf9b	29	#include <errno.h>
11c8bf9b	30
763d28b9	31	#include <sys/types.h>
11c8bf9b	32	#include <sys/uio.h>
11c8bf9b	33
98db6da3	34	#include "internal.h"
83e1be2f	35	#include "tvarith.h"
98db6da3	36
f2ad23ee	37	#define MKQUERY_START(vb) (rqp= (vb)->buf+(vb)->used)
98db6da3	38	#define MKQUERY_ADDB(b) *rqp++= (b)
98db6da3	39	#define MKQUERY_ADDW(w) (MKQUERY_ADDB(((w)>>8)&0x0ff), MKQUERY_ADDB((w)&0x0ff))
f2ad23ee	40	#define MKQUERY_STOP(vb) ((vb)->used= rqp-(vb)->buf)
98db6da3	41
f2ad23ee	42	static adns_status mkquery_header(adns_state ads, vbuf vb, int id_r, int qdlen) {
	43	int id;
	44	byte *rqp;
	45
9b86645c	46	if (!adns__vbuf_ensure(vb,DNS_HDRSIZE+qdlen+4)) return adns_s_nomemory;
98db6da3	47
f2ad23ee	48	vb->used= 0;
	49	MKQUERY_START(vb);
	50
7e6a84a1	51	*id_r= id= (ads->nextid++) & 0x0ffff;
98db6da3	52	MKQUERY_ADDW(id);
	53	MKQUERY_ADDB(0x01); /* QR=Q(0), OPCODE=QUERY(0000), !AA, !TC, RD */
	54	MKQUERY_ADDB(0x00); /* !RA, Z=000, RCODE=NOERROR(0000) */
	55	MKQUERY_ADDW(1); /* QDCOUNT=1 */
	56	MKQUERY_ADDW(0); /* ANCOUNT=0 */
	57	MKQUERY_ADDW(0); /* NSCOUNT=0 */
	58	MKQUERY_ADDW(0); /* ARCOUNT=0 */
f2ad23ee	59
	60	MKQUERY_STOP(vb);
	61
	62	return adns_s_ok;
	63	}
	64
	65	static adns_status mkquery_footer(vbuf *vb, adns_rrtype type) {
	66	byte *rqp;
	67
	68	MKQUERY_START(vb);
	69	MKQUERY_ADDW(type & adns__rrt_typemask); /* QTYPE */
	70	MKQUERY_ADDW(DNS_CLASS_IN); /* QCLASS=IN */
	71	MKQUERY_STOP(vb);
	72	assert(vb->used <= vb->avail);
	73
	74	return adns_s_ok;
	75	}
	76
	77	adns_status adns__mkquery(adns_state ads, vbuf vb, int id_r,
	78	const char *owner, int ol,
	79	const typeinfo *typei, adns_queryflags flags) {
	80	int ll, c, nlabs;
	81	byte label[255], *rqp;
	82	const char p, pe;
	83	adns_status st;
	84
fc86e61f	85	st= mkquery_header(ads,vb,id_r,ol+2); if (st) return st;
f2ad23ee	86
	87	MKQUERY_START(vb);
	88
98db6da3	89	p= owner; pe= owner+ol;
98db6da3	90	nlabs= 0;
7683abe2	91	while (p!=pe) {
98db6da3	92	ll= 0;
	93	while (p!=pe && (c= *p++)!='.') {
	94	if (c=='\\') {
9b86645c	95	if (!(flags & adns_qf_quoteok_query)) return adns_s_querydomaininvalid;
98db6da3	96	if (ctype_digit(p[0])) {
	97	if (ctype_digit(p[1]) && ctype_digit(p[2])) {
	98	c= (p++ - '0')100 + (p++ - '0')10 + (*p++ - '0');
9b86645c	99	if (c >= 256) return adns_s_querydomaininvalid;
98db6da3	100	} else {
9b86645c	101	return adns_s_querydomaininvalid;
98db6da3	102	}
98db6da3	103	} else if (!(c= *p++)) {
9b86645c	104	return adns_s_querydomaininvalid;
98db6da3	105	}
98db6da3	106	}
cd363ffd	107	if (!(flags & adns_qf_quoteok_query)) {
cfdca685	108	if (c == '-') {
9b86645c	109	if (!ll) return adns_s_querydomaininvalid;
cfdca685	110	} else if (!ctype_alpha(c) && !ctype_digit(c)) {
9b86645c	111	return adns_s_querydomaininvalid;
98db6da3	112	}
98db6da3	113	}
9b86645c	114	if (ll == sizeof(label)) return adns_s_querydomaininvalid;
98db6da3	115	label[ll++]= c;
98db6da3	116	}
9b86645c	117	if (!ll) return adns_s_querydomaininvalid;
9b86645c	118	if (nlabs++ > 63) return adns_s_querydomaintoolong;
98db6da3	119	MKQUERY_ADDB(ll);
98db6da3	120	memcpy(rqp,label,ll); rqp+= ll;
7683abe2	121	}
f2ad23ee	122	MKQUERY_ADDB(0);
	123
	124	MKQUERY_STOP(vb);
	125
	126	st= mkquery_footer(vb,typei->type);
	127
	128	return adns_s_ok;
	129	}
98db6da3	130
f2ad23ee	131	adns_status adns__mkquery_frdgram(adns_state ads, vbuf vb, int id_r,
	132	const byte *qd_dgram, int qd_dglen, int qd_begin,
	133	adns_rrtype type, adns_queryflags flags) {
	134	byte *rqp;
	135	findlabel_state fls;
	136	int lablen, labstart;
	137	adns_status st;
	138
	139	st= mkquery_header(ads,vb,id_r,qd_dglen); if (st) return st;
	140
	141	MKQUERY_START(vb);
	142
	143	adns__findlabel_start(&fls,ads,-1,0,qd_dgram,qd_dglen,qd_dglen,qd_begin,0);
	144	for (;;) {
	145	st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
	146	if (!lablen) break;
	147	assert(lablen<255);
	148	MKQUERY_ADDB(lablen);
	149	memcpy(rqp,qd_dgram+labstart,lablen);
	150	rqp+= lablen;
	151	}
98db6da3	152	MKQUERY_ADDB(0);
98db6da3	153
f2ad23ee	154	MKQUERY_STOP(vb);
	155
	156	st= mkquery_footer(vb,type);
98db6da3	157
	158	return adns_s_ok;
	159	}
	160
d0a057ac	161	void adns__querysend_tcp(adns_query qu, struct timeval now) {
98db6da3	162	byte length[2];
	163	struct iovec iov[2];
	164	int wr, r;
11c8bf9b	165	adns_state ads;
98db6da3	166
11c8bf9b	167	if (qu->ads->tcpstate != server_ok) return;
98db6da3	168
d0a057ac	169	assert(qu->state == query_tcpw);
d0a057ac	170
98db6da3	171	length[0]= (qu->query_dglen&0x0ff00U) >>8;
98db6da3	172	length[1]= (qu->query_dglen&0x0ff);
11c8bf9b	173
11c8bf9b	174	ads= qu->ads;
98db6da3	175	if (!adns__vbuf_ensure(&ads->tcpsend,ads->tcpsend.used+qu->query_dglen+2)) return;
98db6da3	176
d0a057ac	177	qu->retries++;
	178
	179	/* Reset idle timeout. */
	180	ads->tcptimeout.tv_sec= ads->tcptimeout.tv_usec= 0;
98db6da3	181
	182	if (ads->tcpsend.used) {
	183	wr= 0;
	184	} else {
	185	iov[0].iov_base= length;
	186	iov[0].iov_len= 2;
	187	iov[1].iov_base= qu->query_dgram;
	188	iov[1].iov_len= qu->query_dglen;
87e46054	189	adns__sigpipe_protect(qu->ads);
11c8bf9b	190	wr= writev(qu->ads->tcpsocket,iov,2);
87e46054	191	adns__sigpipe_unprotect(qu->ads);
98db6da3	192	if (wr < 0) {
	193	if (!(errno == EAGAIN \|\| errno == EINTR \|\| errno == ENOSPC \|\|
	194	errno == ENOBUFS \|\| errno == ENOMEM)) {
	195	adns__tcp_broken(ads,"write",strerror(errno));
	196	return;
	197	}
	198	wr= 0;
	199	}
	200	}
	201
	202	if (wr<2) {
	203	r= adns__vbuf_append(&ads->tcpsend,length,2-wr); assert(r);
	204	wr= 0;
	205	} else {
	206	wr-= 2;
	207	}
	208	if (wr<qu->query_dglen) {
	209	r= adns__vbuf_append(&ads->tcpsend,qu->query_dgram+wr,qu->query_dglen-wr); assert(r);
	210	}
	211	}
	212
11c8bf9b	213	static void query_usetcp(adns_query qu, struct timeval now) {
d0a057ac	214	qu->state= query_tcpw;
98db6da3	215	qu->timeout= now;
d0a057ac	216	timevaladd(&qu->timeout,TCPWAITMS);
	217	LIST_LINK_TAIL(qu->ads->tcpw,qu);
	218	adns__querysend_tcp(qu,now);
11c8bf9b	219	adns__tcp_tryconnect(qu->ads,now);
98db6da3	220	}
98db6da3	221
24d52b13	222	void adns__query_send(adns_query qu, struct timeval now) {
98db6da3	223	struct sockaddr_in servaddr;
98db6da3	224	int serv, r;
11c8bf9b	225	adns_state ads;
98db6da3	226
24d52b13	227	assert(qu->state == query_tosend);
98db6da3	228	if ((qu->flags & adns_qf_usevc) \|\| (qu->query_dglen > DNS_MAXUDP)) {
11c8bf9b	229	query_usetcp(qu,now);
98db6da3	230	return;
	231	}
	232
d0a057ac	233	if (qu->retries >= UDPMAXRETRIES) {
11c8bf9b	234	adns__query_fail(qu,adns_s_timeout);
98db6da3	235	return;
	236	}
	237
	238	serv= qu->udpnextserver;
	239	memset(&servaddr,0,sizeof(servaddr));
11c8bf9b	240
11c8bf9b	241	ads= qu->ads;
98db6da3	242	servaddr.sin_family= AF_INET;
	243	servaddr.sin_addr= ads->servers[serv].addr;
	244	servaddr.sin_port= htons(DNS_PORT);
	245
763d28b9	246	r= sendto(ads->udpsocket,qu->query_dgram,qu->query_dglen,0,
763d28b9	247	(const struct sockaddr*)&servaddr,sizeof(servaddr));
d0a057ac	248	if (r<0 && errno == EMSGSIZE) { qu->retries= 0; query_usetcp(qu,now); return; }
98db6da3	249	if (r<0) adns__warn(ads,serv,0,"sendto failed: %s",strerror(errno));
98db6da3	250
98db6da3	251	qu->timeout= now;
d0a057ac	252	timevaladd(&qu->timeout,UDPRETRYMS);
98db6da3	253	qu->udpsent \|= (1<<serv);
98db6da3	254	qu->udpnextserver= (serv+1)%ads->nservers;
d0a057ac	255	qu->retries++;
d0a057ac	256	LIST_LINK_TAIL(ads->udpw,qu);
98db6da3	257	}