ReactOS  0.4.14-dev-41-g31d7680
transmit.c
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1 /*
2  * transmit.c
3  * - construct queries
4  * - send queries
5  */
6 /*
7  * This file is
8  * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
9  *
10  * It is part of adns, which is
11  * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
12  * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
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 
29 #include <errno.h>
30 
31 #ifdef ADNS_JGAA_WIN32
32 # include "adns_win32.h"
33 #else
34 # include <sys/types.h>
35 # include <sys/uio.h>
36 #endif
37 
38 #include "internal.h"
39 #include "tvarith.h"
40 
41 #define MKQUERY_START(vb) (rqp= (vb)->buf+(vb)->used)
42 #define MKQUERY_ADDB(b) *rqp++= (b)
43 #define MKQUERY_ADDW(w) (MKQUERY_ADDB(((w)>>8)&0x0ff), MKQUERY_ADDB((w)&0x0ff))
44 #define MKQUERY_STOP(vb) ((vb)->used= rqp-(vb)->buf)
45 
46 static adns_status mkquery_header(adns_state ads, vbuf *vb, int *id_r, int qdlen) {
47  int id;
48  byte *rqp;
49 
50  if (!adns__vbuf_ensure(vb,DNS_HDRSIZE+qdlen+4)) return adns_s_nomemory;
51 
52  vb->used= 0;
53  MKQUERY_START(vb);
54 
55  *id_r= id= (ads->nextid++) & 0x0ffff;
56  MKQUERY_ADDW(id);
57  MKQUERY_ADDB(0x01); /* QR=Q(0), OPCODE=QUERY(0000), !AA, !TC, RD */
58  MKQUERY_ADDB(0x00); /* !RA, Z=000, RCODE=NOERROR(0000) */
59  MKQUERY_ADDW(1); /* QDCOUNT=1 */
60  MKQUERY_ADDW(0); /* ANCOUNT=0 */
61  MKQUERY_ADDW(0); /* NSCOUNT=0 */
62  MKQUERY_ADDW(0); /* ARCOUNT=0 */
63 
64  MKQUERY_STOP(vb);
65 
66  return adns_s_ok;
67 }
68 
70  byte *rqp;
71 
72  MKQUERY_START(vb);
73  MKQUERY_ADDW(type & adns__rrt_typemask); /* QTYPE */
74  MKQUERY_ADDW(DNS_CLASS_IN); /* QCLASS=IN */
75  MKQUERY_STOP(vb);
76  assert(vb->used <= vb->avail);
77 
78  return adns_s_ok;
79 }
80 
82  const char *owner, int ol,
83  const typeinfo *typei, adns_queryflags flags) {
84  int ll, c, nbytes;
85  byte label[255], *rqp;
86  const char *p, *pe;
87  adns_status st;
88 
89  st= mkquery_header(ads,vb,id_r,ol+2); if (st) return st;
90 
91  MKQUERY_START(vb);
92 
93  p= owner; pe= owner+ol;
94  nbytes= 0;
95  while (p!=pe) {
96  ll= 0;
97  while (p!=pe && (c= *p++)!='.') {
98  if (c=='\\') {
100  if (ctype_digit(p[0])) {
101  if (ctype_digit(p[1]) && ctype_digit(p[2])) {
102  c= (p[0] - '0')*100 + (p[1] - '0')*10 + (p[2] - '0');
103  p += 3;
104  if (c >= 256) return adns_s_querydomaininvalid;
105  } else {
107  }
108  } else if (!(c= *p++)) {
110  }
111  }
112  if (!(flags & adns_qf_quoteok_query)) {
113  if (c == '-') {
114  if (!ll) return adns_s_querydomaininvalid;
115  } else if (!ctype_alpha(c) && !ctype_digit(c)) {
117  }
118  }
119  if (ll == sizeof(label)) return adns_s_querydomaininvalid;
120  label[ll++]= c;
121  }
122  if (!ll) return adns_s_querydomaininvalid;
124  nbytes+= ll+1;
125  if (nbytes >= DNS_MAXDOMAIN) return adns_s_querydomaintoolong;
126  MKQUERY_ADDB(ll);
127  memcpy(rqp,label,(size_t) ll); rqp+= ll;
128  }
129  MKQUERY_ADDB(0);
130 
131  MKQUERY_STOP(vb);
132 
133  st= mkquery_footer(vb,typei->type);
134 
135  return adns_s_ok;
136 }
137 
139  const byte *qd_dgram, int qd_dglen, int qd_begin,
141  byte *rqp;
143  int lablen, labstart;
144  adns_status st;
145 
146  st= mkquery_header(ads,vb,id_r,qd_dglen); if (st) return st;
147 
148  MKQUERY_START(vb);
149 
150  adns__findlabel_start(&fls,ads,-1,0,qd_dgram,qd_dglen,qd_dglen,qd_begin,0);
151  for (;;) {
152  st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
153  if (!lablen) break;
154  assert(lablen<255);
155  MKQUERY_ADDB(lablen);
156  memcpy(rqp,qd_dgram+labstart, (size_t) lablen);
157  rqp+= lablen;
158  }
159  MKQUERY_ADDB(0);
160 
161  MKQUERY_STOP(vb);
162 
163  st= mkquery_footer(vb,type);
164 
165  return adns_s_ok;
166 }
167 
169  byte length[2];
170  struct iovec iov[2];
171  int wr, r;
172  adns_state ads;
173 
174  if (qu->ads->tcpstate != server_ok) return;
175 
176  assert(qu->state == query_tcpw);
177 
178  length[0]= (qu->query_dglen&0x0ff00U) >>8;
179  length[1]= (qu->query_dglen&0x0ff);
180 
181  ads= qu->ads;
182  if (!adns__vbuf_ensure(&ads->tcpsend,ads->tcpsend.used+qu->query_dglen+2)) return;
183 
184  qu->retries++;
185 
186  /* Reset idle timeout. */
187  ads->tcptimeout.tv_sec= ads->tcptimeout.tv_usec= 0;
188 
189  if (ads->tcpsend.used) {
190  wr= 0;
191  } else {
192  iov[0].iov_base= (char*)length;
193  iov[0].iov_len= 2;
194  iov[1].iov_base= (char*)qu->query_dgram;
195  iov[1].iov_len= qu->query_dglen;
197 
199  wr= writev(qu->ads->tcpsocket,iov,2);
202  if (wr < 0) {
203  if (!(errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR || errno == ENOSPC ||
204  errno == ENOBUFS || errno == ENOMEM)) {
206  return;
207  }
208  wr= 0;
209  }
210  }
211 
212  if (wr<2) {
214  wr= 0;
215  } else {
216  wr-= 2;
217  }
218  if (wr<qu->query_dglen) {
220  }
221 }
222 
223 static void query_usetcp(adns_query qu, struct timeval now) {
224  qu->state= query_tcpw;
225  qu->timeout= now;
227  LIST_LINK_TAIL(qu->ads->tcpw,qu);
230 }
231 
233  struct sockaddr_in servaddr;
234  int serv, r;
235  adns_state ads;
236 
237  assert(qu->state == query_tosend);
238  if ((qu->flags & adns_qf_usevc) || (qu->query_dglen > DNS_MAXUDP)) {
239  query_usetcp(qu,now);
240  return;
241  }
242 
243  if (qu->retries >= UDPMAXRETRIES) {
245  return;
246  }
247 
248  serv= qu->udpnextserver;
249  memset(&servaddr,0,sizeof(servaddr));
250 
251  ads= qu->ads;
252  servaddr.sin_family= AF_INET;
253  servaddr.sin_addr= ads->servers[serv].addr;
254  servaddr.sin_port= htons(DNS_PORT);
255 
257  r= sendto(ads->udpsocket,(char*)qu->query_dgram,qu->query_dglen,0,
258  (const struct sockaddr*)&servaddr,sizeof(servaddr));
260  if (r<0 && errno == EMSGSIZE) { qu->retries= 0; query_usetcp(qu,now); return; }
261  if (r<0 && ((errno != EAGAIN) && (errno != EWOULDBLOCK))) adns__warn(ads,serv,0,"sendto failed: %s (%d)",strerror(errno), errno);
262 
263  qu->timeout= now;
265  qu->udpsent |= (1<<serv);
266  qu->udpnextserver= (serv+1)%ads->nservers;
267  qu->retries++;
268  LIST_LINK_TAIL(ads->udpw,qu);
269 }
#define UDPRETRYMS
Definition: internal.h:66
#define DNS_PORT
Definition: internal.h:72
void * iov_base
Definition: linux.h:1701
u_short sin_port
Definition: winsock.h:511
adns_state ads
Definition: adh-query.c:35
#define UDPMAXRETRIES
Definition: internal.h:65
GLdouble GLdouble GLdouble r
Definition: gl.h:2055
adns_rrtype
Definition: adns.h:113
static void query_usetcp(adns_query qu, struct timeval now)
Definition: transmit.c:223
#define MKQUERY_STOP(vb)
Definition: transmit.c:44
#define U(x)
Definition: wordpad.c:44
int nservers
Definition: internal.h:300
#define EINTR
Definition: acclib.h:80
ADNS_SOCKET udpsocket
Definition: internal.h:298
#define ENOBUFS
Definition: errno.h:116
int udpnextserver
Definition: internal.h:228
GLuint GLuint GLsizei GLenum type
Definition: gl.h:1545
#define assert(x)
Definition: debug.h:53
int retries
Definition: internal.h:227
int avail
Definition: internal.h:111
void adns__sigpipe_unprotect(adns_state ads)
Definition: general.c:360
int errno
const char * strerror(int err)
Definition: compat_str.c:23
#define MKQUERY_ADDB(b)
Definition: transmit.c:42
Definition: arc.h:48
#define DNS_MAXLABEL
Definition: internal.h:74
adns_status adns__findlabel_next(findlabel_state *fls, int *lablen_r, int *labstart_r)
Definition: parse.c:74
#define DNS_HDRSIZE
Definition: internal.h:76
static int fls(int x)
Definition: bitops.h:157
int adns__vbuf_ensure(vbuf *vb, int want)
Definition: general.c:116
#define LIST_LINK_TAIL(list, node)
Definition: dlist.h:51
__kernel_size_t iov_len
Definition: linux.h:1702
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Definition: adns.h:215
time_t now
Definition: finger.c:65
unsigned long udpsent
Definition: internal.h:229
#define EWOULDBLOCK
Definition: errno.h:42
struct timeval timeout
Definition: internal.h:230
int adns__vbuf_append(vbuf *vb, const byte *data, int len)
Definition: general.c:131
#define DNS_CLASS_IN
Definition: internal.h:78
Definition: arc.h:49
void adns__warn(adns_state ads, int serv, adns_query qu, const char *fmt,...)
Definition: general.c:94
Definition: arc.h:35
adns_state ads
Definition: internal.h:182
vbuf tcpsend
Definition: internal.h:299
#define ADNS_CLEAR_ERRNO
Definition: adns_win32.h:108
static void timevaladd(struct timeval *tv_io, long ms)
Definition: tvarith.h:31
void adns__tcp_tryconnect(adns_state ads, struct timeval now)
Definition: event.c:90
#define MKQUERY_START(vb)
Definition: transmit.c:41
struct adns__state::server servers[MAXSERVERS]
GLenum GLuint GLenum GLsizei length
Definition: glext.h:5579
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Definition: event.c:59
#define TCPWAITMS
Definition: internal.h:67
const GLubyte * c
Definition: glext.h:8905
struct timeval tcptimeout
Definition: internal.h:305
GLbitfield flags
Definition: glext.h:7161
byte * query_dgram
Definition: internal.h:192
ADNS_SOCKET tcpsocket
Definition: internal.h:298
int query_dglen
Definition: internal.h:193
#define DNS_MAXUDP
Definition: internal.h:73
adns_status adns__mkquery(adns_state ads, vbuf *vb, int *id_r, const char *owner, int ol, const typeinfo *typei, adns_queryflags flags)
Definition: transmit.c:81
Definition: linux.h:1699
int nextid
Definition: internal.h:297
#define memcpy(s1, s2, n)
Definition: mkisofs.h:878
Definition: internal.h:110
static int ctype_digit(int c)
Definition: internal.h:698
uint8_t label[11]
Definition: fsck.fat.h:65
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Definition: adns.h:100
struct in_addr sin_addr
Definition: winsock.h:512
static adns_status mkquery_footer(vbuf *vb, adns_rrtype type)
Definition: transmit.c:69
#define MKQUERY_ADDW(w)
Definition: transmit.c:43
void adns__query_send(adns_query qu, struct timeval now)
Definition: transmit.c:232
#define DNS_MAXDOMAIN
Definition: internal.h:75
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: transmit.c:138
w ll
Definition: byte_order.h:166
#define ADNS_CAPTURE_ERRNO
Definition: adns_win32.h:107
#define writev(FileDescriptor, iov, iovCount)
Definition: adns_win32.h:160
adns_rrtype type
Definition: internal.h:125
static adns_status mkquery_header(adns_state ads, vbuf *vb, int *id_r, int qdlen)
Definition: transmit.c:46
int used
Definition: internal.h:111
INT WSAAPI sendto(IN SOCKET s, IN CONST CHAR FAR *buf, IN INT len, IN INT flags, IN CONST struct sockaddr *to, IN INT tolen)
Definition: send.c:82
void adns__querysend_tcp(adns_query qu, struct timeval now)
Definition: transmit.c:168
void adns__findlabel_start(findlabel_state *fls, adns_state ads, int serv, adns_query qu, const byte *dgram, int dglen, int max, int dmbegin, int *dmend_rlater)
Definition: parse.c:59
#define c
Definition: ke_i.h:80
GLenum GLuint id
Definition: glext.h:5579
#define AF_INET
Definition: tcpip.h:117
void adns__query_fail(adns_query qu, adns_status stat)
Definition: query.c:547
#define EMSGSIZE
Definition: errno.h:97
static int ctype_alpha(int c)
Definition: internal.h:699
GLfloat GLfloat p
Definition: glext.h:8902
#define htons(x)
Definition: module.h:213
void adns__sigpipe_protect(adns_state ads)
Definition: general.c:340
#define memset(x, y, z)
Definition: compat.h:39
short sin_family
Definition: winsock.h:510
enum adns__state::adns__tcpstate tcpstate
enum adns__query::@3833 state