Commit | Line | Data |
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98db6da3 | 1 | /* |
2 | * transmit.c | |
3 | * - construct queries | |
4 | * - send queries | |
5 | */ | |
6 | /* | |
39f45e7e | 7 | * This file is part of adns, which is |
8 | * Copyright (C) 1997-2000,2003,2006 Ian Jackson | |
9 | * Copyright (C) 1999-2000,2003,2006 Tony Finch | |
10 | * Copyright (C) 1991 Massachusetts Institute of Technology | |
11 | * (See the file INSTALL for full details.) | |
98db6da3 | 12 | * |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2, or (at your option) | |
16 | * any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software Foundation, | |
25 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | */ | |
27 | ||
11c8bf9b | 28 | #include <errno.h> |
11c8bf9b | 29 | |
763d28b9 | 30 | #include <sys/types.h> |
11c8bf9b | 31 | #include <sys/uio.h> |
32 | ||
98db6da3 | 33 | #include "internal.h" |
83e1be2f | 34 | #include "tvarith.h" |
98db6da3 | 35 | |
f2ad23ee | 36 | #define MKQUERY_START(vb) (rqp= (vb)->buf+(vb)->used) |
98db6da3 | 37 | #define MKQUERY_ADDB(b) *rqp++= (b) |
38 | #define MKQUERY_ADDW(w) (MKQUERY_ADDB(((w)>>8)&0x0ff), MKQUERY_ADDB((w)&0x0ff)) | |
f2ad23ee | 39 | #define MKQUERY_STOP(vb) ((vb)->used= rqp-(vb)->buf) |
98db6da3 | 40 | |
9c344a42 | 41 | static adns_status mkquery_header(adns_state ads, vbuf *vb, |
42 | int *id_r, int qdlen) { | |
f2ad23ee | 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); | |
7d0aaee4 | 69 | MKQUERY_ADDW(type & adns_rrt_typemask); /* QTYPE */ |
f2ad23ee | 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, | |
7d0aaee4 | 79 | const typeinfo *typei, adns_rrtype type, |
80 | adns_queryflags flags) { | |
3540caec | 81 | int labelnum, ll, c, nbytes; |
bddb4c18 | 82 | byte label[255]; |
83 | byte *rqp; | |
f2ad23ee | 84 | const char *p, *pe; |
85 | adns_status st; | |
86 | ||
fc86e61f | 87 | st= mkquery_header(ads,vb,id_r,ol+2); if (st) return st; |
f2ad23ee | 88 | |
89 | MKQUERY_START(vb); | |
90 | ||
98db6da3 | 91 | p= owner; pe= owner+ol; |
f57665b9 | 92 | nbytes= 0; |
bddb4c18 | 93 | labelnum= 0; |
7683abe2 | 94 | while (p!=pe) { |
3540caec MW |
95 | |
96 | ll= 0; | |
97 | while (p!=pe && (c= *p++)!='.') { | |
98 | if (c=='\\') { | |
99 | if (ctype_digit(p[0])) { | |
100 | if (p+1==pe || p+2==pe) return adns_s_querydomaininvalid; | |
101 | if (ctype_digit(p[1]) && ctype_digit(p[2])) { | |
102 | c= (*p++ - '0')*100; | |
103 | c += (*p++ - '0')*10; | |
104 | c += (*p++ - '0'); | |
105 | if (c >= 256) return adns_s_querydomaininvalid; | |
106 | } else { | |
107 | return adns_s_querydomaininvalid; | |
108 | } | |
109 | } else if (!(c= *p++)) { | |
110 | return adns_s_querydomaininvalid; | |
111 | } | |
112 | } | |
113 | if (ll >= DNS_MAXLABEL) return adns_s_querydomaintoolong; | |
114 | label[ll++]= c; | |
115 | } | |
9b86645c | 116 | if (!ll) return adns_s_querydomaininvalid; |
f57665b9 | 117 | nbytes+= ll+1; |
3d75057b | 118 | if (nbytes >= DNS_MAXDOMAIN) return adns_s_querydomaintoolong; |
98db6da3 | 119 | MKQUERY_ADDB(ll); |
120 | memcpy(rqp,label,ll); rqp+= ll; | |
7683abe2 | 121 | } |
f2ad23ee | 122 | MKQUERY_ADDB(0); |
123 | ||
124 | MKQUERY_STOP(vb); | |
125 | ||
7d0aaee4 | 126 | st= mkquery_footer(vb,type); |
f2ad23ee | 127 | |
128 | return adns_s_ok; | |
129 | } | |
98db6da3 | 130 | |
f2ad23ee | 131 | adns_status adns__mkquery_frdgram(adns_state ads, vbuf *vb, int *id_r, |
9c344a42 | 132 | const byte *qd_dgram, int qd_dglen, |
133 | int qd_begin, | |
f2ad23ee | 134 | adns_rrtype type, adns_queryflags flags) { |
135 | byte *rqp; | |
136 | findlabel_state fls; | |
137 | int lablen, labstart; | |
138 | adns_status st; | |
139 | ||
140 | st= mkquery_header(ads,vb,id_r,qd_dglen); if (st) return st; | |
141 | ||
142 | MKQUERY_START(vb); | |
143 | ||
144 | adns__findlabel_start(&fls,ads,-1,0,qd_dgram,qd_dglen,qd_dglen,qd_begin,0); | |
145 | for (;;) { | |
146 | st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st); | |
147 | if (!lablen) break; | |
148 | assert(lablen<255); | |
149 | MKQUERY_ADDB(lablen); | |
150 | memcpy(rqp,qd_dgram+labstart,lablen); | |
151 | rqp+= lablen; | |
152 | } | |
98db6da3 | 153 | MKQUERY_ADDB(0); |
98db6da3 | 154 | |
f2ad23ee | 155 | MKQUERY_STOP(vb); |
156 | ||
157 | st= mkquery_footer(vb,type); | |
98db6da3 | 158 | |
159 | return adns_s_ok; | |
160 | } | |
161 | ||
d0a057ac | 162 | void adns__querysend_tcp(adns_query qu, struct timeval now) { |
98db6da3 | 163 | byte length[2]; |
164 | struct iovec iov[2]; | |
165 | int wr, r; | |
11c8bf9b | 166 | adns_state ads; |
98db6da3 | 167 | |
11c8bf9b | 168 | if (qu->ads->tcpstate != server_ok) return; |
98db6da3 | 169 | |
d0a057ac | 170 | assert(qu->state == query_tcpw); |
171 | ||
98db6da3 | 172 | length[0]= (qu->query_dglen&0x0ff00U) >>8; |
173 | length[1]= (qu->query_dglen&0x0ff); | |
11c8bf9b | 174 | |
175 | ads= qu->ads; | |
9c344a42 | 176 | if (!adns__vbuf_ensure(&ads->tcpsend,ads->tcpsend.used+qu->query_dglen+2)) |
177 | return; | |
98db6da3 | 178 | |
d0a057ac | 179 | qu->retries++; |
180 | ||
181 | /* Reset idle timeout. */ | |
182 | ads->tcptimeout.tv_sec= ads->tcptimeout.tv_usec= 0; | |
98db6da3 | 183 | |
184 | if (ads->tcpsend.used) { | |
185 | wr= 0; | |
186 | } else { | |
187 | iov[0].iov_base= length; | |
188 | iov[0].iov_len= 2; | |
189 | iov[1].iov_base= qu->query_dgram; | |
190 | iov[1].iov_len= qu->query_dglen; | |
87e46054 | 191 | adns__sigpipe_protect(qu->ads); |
11c8bf9b | 192 | wr= writev(qu->ads->tcpsocket,iov,2); |
87e46054 | 193 | adns__sigpipe_unprotect(qu->ads); |
98db6da3 | 194 | if (wr < 0) { |
195 | if (!(errno == EAGAIN || errno == EINTR || errno == ENOSPC || | |
196 | errno == ENOBUFS || errno == ENOMEM)) { | |
197 | adns__tcp_broken(ads,"write",strerror(errno)); | |
198 | return; | |
199 | } | |
200 | wr= 0; | |
201 | } | |
202 | } | |
203 | ||
204 | if (wr<2) { | |
205 | r= adns__vbuf_append(&ads->tcpsend,length,2-wr); assert(r); | |
206 | wr= 0; | |
207 | } else { | |
208 | wr-= 2; | |
209 | } | |
210 | if (wr<qu->query_dglen) { | |
9c344a42 | 211 | r= adns__vbuf_append(&ads->tcpsend,qu->query_dgram+wr,qu->query_dglen-wr); |
212 | assert(r); | |
98db6da3 | 213 | } |
214 | } | |
215 | ||
11c8bf9b | 216 | static void query_usetcp(adns_query qu, struct timeval now) { |
d0a057ac | 217 | qu->state= query_tcpw; |
98db6da3 | 218 | qu->timeout= now; |
d0a057ac | 219 | timevaladd(&qu->timeout,TCPWAITMS); |
220 | LIST_LINK_TAIL(qu->ads->tcpw,qu); | |
221 | adns__querysend_tcp(qu,now); | |
11c8bf9b | 222 | adns__tcp_tryconnect(qu->ads,now); |
98db6da3 | 223 | } |
224 | ||
24d52b13 | 225 | void adns__query_send(adns_query qu, struct timeval now) { |
705b9b15 | 226 | int serv, r, i; |
11c8bf9b | 227 | adns_state ads; |
705b9b15 MW |
228 | int fd = -1; |
229 | struct udpsocket *udp; | |
230 | adns_rr_addr *addr; | |
98db6da3 | 231 | |
24d52b13 | 232 | assert(qu->state == query_tosend); |
98db6da3 | 233 | if ((qu->flags & adns_qf_usevc) || (qu->query_dglen > DNS_MAXUDP)) { |
11c8bf9b | 234 | query_usetcp(qu,now); |
98db6da3 | 235 | return; |
236 | } | |
237 | ||
d0a057ac | 238 | if (qu->retries >= UDPMAXRETRIES) { |
11c8bf9b | 239 | adns__query_fail(qu,adns_s_timeout); |
98db6da3 | 240 | return; |
241 | } | |
242 | ||
11c8bf9b | 243 | ads= qu->ads; |
705b9b15 MW |
244 | serv= qu->udpnextserver; |
245 | addr= &ads->servers[serv]; | |
246 | for (i = 0; i < ads->nudp; i++) { | |
247 | udp = &ads->udpsocket[i]; | |
248 | if (udp->ai->af == addr->addr.sa.sa_family) { fd = udp->fd; break; } | |
249 | } | |
250 | assert(fd >= 0); | |
98db6da3 | 251 | |
705b9b15 MW |
252 | r= sendto(fd,qu->query_dgram,qu->query_dglen,0, |
253 | &addr->addr.sa,addr->len); | |
9c344a42 | 254 | if (r<0 && errno == EMSGSIZE) { |
255 | qu->retries= 0; | |
256 | query_usetcp(qu,now); | |
257 | return; | |
258 | } | |
259 | if (r<0 && errno != EAGAIN) | |
260 | adns__warn(ads,serv,0,"sendto failed: %s",strerror(errno)); | |
98db6da3 | 261 | |
98db6da3 | 262 | qu->timeout= now; |
d0a057ac | 263 | timevaladd(&qu->timeout,UDPRETRYMS); |
98db6da3 | 264 | qu->udpsent |= (1<<serv); |
265 | qu->udpnextserver= (serv+1)%ads->nservers; | |
d0a057ac | 266 | qu->retries++; |
267 | LIST_LINK_TAIL(ads->udpw,qu); | |
98db6da3 | 268 | } |