transmit.c File Reference

#include <errno.h>
#include <sys/types.h>
#include <sys/uio.h>
#include "internal.h"
#include "tvarith.h"

Include dependency graph for transmit.c:

Go to the source code of this file.

Macros
#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)

Functions
static adns_status	mkquery_header (adns_state ads, vbuf *vb, int *id_r, int qdlen)
static adns_status	mkquery_footer (vbuf *vb, adns_rrtype type)
adns_status	adns__mkquery (adns_state ads, vbuf *vb, int *id_r, const char *owner, int ol, const typeinfo *typei, adns_queryflags flags)
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)
void	adns__querysend_tcp (adns_query qu, struct timeval now)
static void	query_usetcp (adns_query qu, struct timeval now)
void	adns__query_send (adns_query qu, struct timeval now)

Macro Definition Documentation

MKQUERY_ADDB

#define MKQUERY_ADDB

(

b

)

*rqp++= (b)

Definition at line 42 of file transmit.c.

MKQUERY_ADDW

#define MKQUERY_ADDW

(

w

)

(MKQUERY_ADDB(((w)>>8)&0x0ff), MKQUERY_ADDB((w)&0x0ff))

Definition at line 43 of file transmit.c.

MKQUERY_START

#define MKQUERY_START

(

vb

)

(rqp= (vb)->buf+(vb)->used)

Definition at line 41 of file transmit.c.

MKQUERY_STOP

#define MKQUERY_STOP

(

vb

)

((vb)->used= rqp-(vb)->buf)

Definition at line 44 of file transmit.c.

Function Documentation

adns__mkquery()

adns_status adns__mkquery	(	adns_state	ads,
		vbuf *	vb,
		int *	id_r,
		const char *	owner,
		int	ol,
		const typeinfo *	typei,
		adns_queryflags	flags
	)

Definition at line 81 of file transmit.c.

                                                            {
  int ll, c, nbytes;
  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;
  nbytes= 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] - '0')*100 + (p[1] - '0')*10 + (p[2] - '0');
        p += 3;
        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 (ll > DNS_MAXLABEL) return adns_s_querydomaintoolong;
    nbytes+= ll+1;
    if (nbytes >= DNS_MAXDOMAIN) return adns_s_querydomaintoolong;
    MKQUERY_ADDB(ll);
    memcpy(rqp,label,(size_t) ll); rqp+= ll;
  }
  MKQUERY_ADDB(0);
 
  MKQUERY_STOP(vb);
 
  st= mkquery_footer(vb,typei->type);
 
  return adns_s_ok;
}

Referenced by query_simple().

adns__mkquery_frdgram()

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
	)

Definition at line 138 of file transmit.c.

                                                           {
  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, (size_t) lablen);
    rqp+= lablen;
  }
  MKQUERY_ADDB(0);
 
  MKQUERY_STOP(vb);
 
  st= mkquery_footer(vb,type);
 
  return adns_s_ok;
}

Referenced by adns__procdgram(), pa_ptr(), and pap_hostaddr().

adns__query_send()

void adns__query_send	(	adns_query	qu,
		struct timeval	now
	)

Definition at line 232 of file transmit.c.

                                                         {
  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);
 
  ADNS_CLEAR_ERRNO;
  r= sendto(ads->udpsocket,(char*)qu->query_dgram,qu->query_dglen,0,
        (const struct sockaddr*)&servaddr,sizeof(servaddr));
  ADNS_CAPTURE_ERRNO;
  if (r<0 && errno == EMSGSIZE) { qu->retries= 0; query_usetcp(qu,now); return; }
  if (r<0 && ((errno != EAGAIN) && (errno != EWOULDBLOCK))) adns__warn(ads,serv,0,"sendto failed: %s (%d)",strerror(errno), 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);
}

Referenced by adns__procdgram(), query_submit(), and timeouts_queue().

adns__querysend_tcp()

void adns__querysend_tcp	(	adns_query	qu,
		struct timeval	now
	)

Definition at line 168 of file transmit.c.

                                                            {
  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= (char*)length;
    iov[0].iov_len= 2;
    iov[1].iov_base= (char*)qu->query_dgram;
    iov[1].iov_len= qu->query_dglen;
    adns__sigpipe_protect(qu->ads);
 
    ADNS_CLEAR_ERRNO;
    wr= writev(qu->ads->tcpsocket,iov,2);
    ADNS_CAPTURE_ERRNO;
    adns__sigpipe_unprotect(qu->ads);
    if (wr < 0) {
      if (!(errno == EAGAIN || errno == EWOULDBLOCK || 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);
  }
}

Referenced by query_usetcp(), and tcp_connected().

mkquery_footer()

static adns_status mkquery_footer ( vbuf *  vb, adns_rrtype  type  )

static

Definition at line 69 of file transmit.c.

                                                              {
  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;
}

Referenced by adns__mkquery(), and adns__mkquery_frdgram().

mkquery_header()

static adns_status mkquery_header ( adns_state  ads, vbuf *  vb, int *  id_r, int  qdlen  )

static

Definition at line 46 of file transmit.c.

                                                                                  {
  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;
}

Referenced by adns__mkquery(), and adns__mkquery_frdgram().

query_usetcp()

static void query_usetcp ( adns_query  qu, struct timeval  now  )

static

Definition at line 223 of file transmit.c.

                                                            {
  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);
}

Referenced by adns__query_send().