1199767f8SToomas Soome /* $NetBSD: net.c,v 1.20 1997/12/26 22:41:30 scottr Exp $ */
2199767f8SToomas Soome
3199767f8SToomas Soome /*
4199767f8SToomas Soome * Copyright (c) 1992 Regents of the University of California.
5199767f8SToomas Soome * All rights reserved.
6199767f8SToomas Soome *
7199767f8SToomas Soome * This software was developed by the Computer Systems Engineering group
8199767f8SToomas Soome * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9199767f8SToomas Soome * contributed to Berkeley.
10199767f8SToomas Soome *
11199767f8SToomas Soome * Redistribution and use in source and binary forms, with or without
12199767f8SToomas Soome * modification, are permitted provided that the following conditions
13199767f8SToomas Soome * are met:
14199767f8SToomas Soome * 1. Redistributions of source code must retain the above copyright
15199767f8SToomas Soome * notice, this list of conditions and the following disclaimer.
16199767f8SToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
17199767f8SToomas Soome * notice, this list of conditions and the following disclaimer in the
18199767f8SToomas Soome * documentation and/or other materials provided with the distribution.
191974da4bSToomas Soome * 3. Neither the name of the University nor the names of its contributors
20199767f8SToomas Soome * may be used to endorse or promote products derived from this software
21199767f8SToomas Soome * without specific prior written permission.
22199767f8SToomas Soome *
23199767f8SToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24199767f8SToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25199767f8SToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26199767f8SToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27199767f8SToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28199767f8SToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29199767f8SToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30199767f8SToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31199767f8SToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32199767f8SToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33199767f8SToomas Soome * SUCH DAMAGE.
34199767f8SToomas Soome *
35199767f8SToomas Soome * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
36199767f8SToomas Soome */
37199767f8SToomas Soome
38199767f8SToomas Soome #include <sys/cdefs.h>
39199767f8SToomas Soome
40199767f8SToomas Soome #include <sys/param.h>
41199767f8SToomas Soome #include <sys/socket.h>
42199767f8SToomas Soome
43199767f8SToomas Soome #include <string.h>
44199767f8SToomas Soome
45199767f8SToomas Soome #include <net/if.h>
46199767f8SToomas Soome #include <netinet/in.h>
47199767f8SToomas Soome #include <netinet/if_ether.h>
48199767f8SToomas Soome #include <netinet/in_systm.h>
49199767f8SToomas Soome
50199767f8SToomas Soome #include <netinet/ip.h>
51199767f8SToomas Soome #include <netinet/ip_var.h>
52199767f8SToomas Soome #include <netinet/udp.h>
53199767f8SToomas Soome #include <netinet/udp_var.h>
54199767f8SToomas Soome
55199767f8SToomas Soome #include "stand.h"
56199767f8SToomas Soome #include "net.h"
57199767f8SToomas Soome
58e78c3bfbSToomas Soome /*
59e78c3bfbSToomas Soome * Maximum wait time for sending and receiving before we give up and timeout.
60e78c3bfbSToomas Soome * If set to 0, operations will eventually timeout completely, but send/recv
61e78c3bfbSToomas Soome * timeouts must progress exponentially from MINTMO to MAXTMO before final
62e78c3bfbSToomas Soome * timeout is hit.
63e78c3bfbSToomas Soome */
64e78c3bfbSToomas Soome #ifndef MAXWAIT
65e78c3bfbSToomas Soome #define MAXWAIT 0 /* seconds */
66e78c3bfbSToomas Soome #endif
67e78c3bfbSToomas Soome
68e78c3bfbSToomas Soome #if MAXWAIT < 0
69e78c3bfbSToomas Soome #error MAXWAIT must not be a negative number
70e78c3bfbSToomas Soome #endif
71e78c3bfbSToomas Soome
72199767f8SToomas Soome /*
73199767f8SToomas Soome * Send a packet and wait for a reply, with exponential backoff.
74199767f8SToomas Soome *
75199767f8SToomas Soome * The send routine must return the actual number of bytes written,
76199767f8SToomas Soome * or -1 on error.
77199767f8SToomas Soome *
78199767f8SToomas Soome * The receive routine can indicate success by returning the number of
79199767f8SToomas Soome * bytes read; it can return 0 to indicate EOF; it can return -1 with a
80199767f8SToomas Soome * non-zero errno to indicate failure; finally, it can return -1 with a
81199767f8SToomas Soome * zero errno to indicate it isn't done yet.
82199767f8SToomas Soome */
83199767f8SToomas Soome ssize_t
sendrecv(struct iodesc * d,ssize_t (* sproc)(struct iodesc *,void *,size_t),void * sbuf,size_t ssize,ssize_t (* rproc)(struct iodesc *,void **,void **,time_t,void *),void ** pkt,void ** payload,void * recv_extra)84199767f8SToomas Soome sendrecv(struct iodesc *d,
85859472daSToomas Soome ssize_t (*sproc)(struct iodesc *, void *, size_t),
86859472daSToomas Soome void *sbuf, size_t ssize,
87890c8671SToomas Soome ssize_t (*rproc)(struct iodesc *, void **, void**, time_t, void *),
88890c8671SToomas Soome void **pkt, void **payload, void *recv_extra)
89199767f8SToomas Soome {
90199767f8SToomas Soome ssize_t cc;
91199767f8SToomas Soome time_t t, tmo, tlast;
92e78c3bfbSToomas Soome time_t tref;
93199767f8SToomas Soome long tleft;
94199767f8SToomas Soome
95199767f8SToomas Soome #ifdef NET_DEBUG
96199767f8SToomas Soome if (debug)
97199767f8SToomas Soome printf("sendrecv: called\n");
98199767f8SToomas Soome #endif
99199767f8SToomas Soome
100199767f8SToomas Soome tmo = MINTMO;
101199767f8SToomas Soome tlast = 0;
102199767f8SToomas Soome tleft = 0;
103e78c3bfbSToomas Soome tref = getsecs();
104199767f8SToomas Soome t = getsecs();
105199767f8SToomas Soome for (;;) {
106e78c3bfbSToomas Soome if (MAXWAIT > 0 && (getsecs() - tref) >= MAXWAIT) {
107e78c3bfbSToomas Soome errno = ETIMEDOUT;
108e78c3bfbSToomas Soome return (-1);
109e78c3bfbSToomas Soome }
110199767f8SToomas Soome if (tleft <= 0) {
111199767f8SToomas Soome if (tmo >= MAXTMO) {
112199767f8SToomas Soome errno = ETIMEDOUT;
113e78c3bfbSToomas Soome return (-1);
114199767f8SToomas Soome }
115199767f8SToomas Soome cc = (*sproc)(d, sbuf, ssize);
116199767f8SToomas Soome if (cc != -1 && cc < ssize)
117199767f8SToomas Soome panic("sendrecv: short write! (%zd < %zd)",
118199767f8SToomas Soome cc, ssize);
119199767f8SToomas Soome
120199767f8SToomas Soome tleft = tmo;
121199767f8SToomas Soome tmo += MINTMO;
122199767f8SToomas Soome if (tmo > MAXTMO)
123199767f8SToomas Soome tmo = MAXTMO;
124199767f8SToomas Soome
125199767f8SToomas Soome if (cc == -1) {
126199767f8SToomas Soome /* Error on transmit; wait before retrying */
127199767f8SToomas Soome while ((getsecs() - t) < tmo)
128199767f8SToomas Soome ;
129199767f8SToomas Soome tleft = 0;
130199767f8SToomas Soome continue;
131199767f8SToomas Soome }
132199767f8SToomas Soome
133199767f8SToomas Soome tlast = t;
134199767f8SToomas Soome }
135199767f8SToomas Soome
136199767f8SToomas Soome /* Try to get a packet and process it. */
137890c8671SToomas Soome cc = (*rproc)(d, pkt, payload, tleft, recv_extra);
138199767f8SToomas Soome /* Return on data, EOF or real error. */
1399a5a2388SToomas Soome if (cc != -1 || (errno != 0 && errno != ETIMEDOUT))
140199767f8SToomas Soome return (cc);
141199767f8SToomas Soome
142199767f8SToomas Soome /* Timed out or didn't get the packet we're waiting for */
143199767f8SToomas Soome t = getsecs();
144199767f8SToomas Soome tleft -= t - tlast;
145199767f8SToomas Soome tlast = t;
146199767f8SToomas Soome }
147199767f8SToomas Soome }
148199767f8SToomas Soome
149199767f8SToomas Soome /*
150199767f8SToomas Soome * Like inet_addr() in the C library, but we only accept base-10.
151199767f8SToomas Soome * Return values are in network order.
152199767f8SToomas Soome */
153199767f8SToomas Soome n_long
inet_addr(char * cp)154199767f8SToomas Soome inet_addr(char *cp)
155199767f8SToomas Soome {
156e78c3bfbSToomas Soome unsigned long val;
157199767f8SToomas Soome int n;
158199767f8SToomas Soome char c;
159e78c3bfbSToomas Soome unsigned int parts[4];
160e78c3bfbSToomas Soome unsigned int *pp = parts;
161199767f8SToomas Soome
162199767f8SToomas Soome for (;;) {
163199767f8SToomas Soome /*
164199767f8SToomas Soome * Collect number up to ``.''.
165199767f8SToomas Soome * Values are specified as for C:
166199767f8SToomas Soome * 0x=hex, 0=octal, other=decimal.
167199767f8SToomas Soome */
168199767f8SToomas Soome val = 0;
169199767f8SToomas Soome while ((c = *cp) != '\0') {
170199767f8SToomas Soome if (c >= '0' && c <= '9') {
171199767f8SToomas Soome val = (val * 10) + (c - '0');
172199767f8SToomas Soome cp++;
173199767f8SToomas Soome continue;
174199767f8SToomas Soome }
175199767f8SToomas Soome break;
176199767f8SToomas Soome }
177199767f8SToomas Soome if (*cp == '.') {
178199767f8SToomas Soome /*
179199767f8SToomas Soome * Internet format:
180199767f8SToomas Soome * a.b.c.d
181199767f8SToomas Soome * a.b.c (with c treated as 16-bits)
182199767f8SToomas Soome * a.b (with b treated as 24 bits)
183199767f8SToomas Soome */
184199767f8SToomas Soome if (pp >= parts + 3 || val > 0xff)
185199767f8SToomas Soome goto bad;
186199767f8SToomas Soome *pp++ = val, cp++;
187199767f8SToomas Soome } else
188199767f8SToomas Soome break;
189199767f8SToomas Soome }
190199767f8SToomas Soome /*
191199767f8SToomas Soome * Check for trailing characters.
192199767f8SToomas Soome */
193199767f8SToomas Soome if (*cp != '\0')
194199767f8SToomas Soome goto bad;
195199767f8SToomas Soome
196199767f8SToomas Soome /*
197199767f8SToomas Soome * Concoct the address according to
198199767f8SToomas Soome * the number of parts specified.
199199767f8SToomas Soome */
200199767f8SToomas Soome n = pp - parts + 1;
201199767f8SToomas Soome switch (n) {
202199767f8SToomas Soome
203199767f8SToomas Soome case 1: /* a -- 32 bits */
204199767f8SToomas Soome break;
205199767f8SToomas Soome
206199767f8SToomas Soome case 2: /* a.b -- 8.24 bits */
207199767f8SToomas Soome if (val > 0xffffff)
208199767f8SToomas Soome goto bad;
209199767f8SToomas Soome val |= parts[0] << 24;
210199767f8SToomas Soome break;
211199767f8SToomas Soome
212199767f8SToomas Soome case 3: /* a.b.c -- 8.8.16 bits */
213199767f8SToomas Soome if (val > 0xffff)
214199767f8SToomas Soome goto bad;
215199767f8SToomas Soome val |= (parts[0] << 24) | (parts[1] << 16);
216199767f8SToomas Soome break;
217199767f8SToomas Soome
218199767f8SToomas Soome case 4: /* a.b.c.d -- 8.8.8.8 bits */
219199767f8SToomas Soome if (val > 0xff)
220199767f8SToomas Soome goto bad;
221199767f8SToomas Soome val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
222199767f8SToomas Soome break;
223199767f8SToomas Soome }
224199767f8SToomas Soome
225199767f8SToomas Soome return (htonl(val));
226e78c3bfbSToomas Soome bad:
227199767f8SToomas Soome return (htonl(INADDR_NONE));
228199767f8SToomas Soome }
229199767f8SToomas Soome
230199767f8SToomas Soome char *
inet_ntoa(struct in_addr ia)231199767f8SToomas Soome inet_ntoa(struct in_addr ia)
232199767f8SToomas Soome {
233199767f8SToomas Soome return (intoa(ia.s_addr));
234199767f8SToomas Soome }
235199767f8SToomas Soome
236199767f8SToomas Soome /* Similar to inet_ntoa() */
237199767f8SToomas Soome char *
intoa(n_long addr)238199767f8SToomas Soome intoa(n_long addr)
239199767f8SToomas Soome {
240199767f8SToomas Soome char *cp;
241e78c3bfbSToomas Soome unsigned int byte;
242199767f8SToomas Soome int n;
243199767f8SToomas Soome static char buf[17]; /* strlen(".255.255.255.255") + 1 */
244199767f8SToomas Soome
245199767f8SToomas Soome addr = ntohl(addr);
246e78c3bfbSToomas Soome cp = &buf[sizeof (buf)];
247199767f8SToomas Soome *--cp = '\0';
248199767f8SToomas Soome
249199767f8SToomas Soome n = 4;
250199767f8SToomas Soome do {
251199767f8SToomas Soome byte = addr & 0xff;
252199767f8SToomas Soome *--cp = byte % 10 + '0';
253199767f8SToomas Soome byte /= 10;
254199767f8SToomas Soome if (byte > 0) {
255199767f8SToomas Soome *--cp = byte % 10 + '0';
256199767f8SToomas Soome byte /= 10;
257199767f8SToomas Soome if (byte > 0)
258199767f8SToomas Soome *--cp = byte + '0';
259199767f8SToomas Soome }
260199767f8SToomas Soome *--cp = '.';
261199767f8SToomas Soome addr >>= 8;
262199767f8SToomas Soome } while (--n > 0);
263199767f8SToomas Soome
264199767f8SToomas Soome return (cp+1);
265199767f8SToomas Soome }
266199767f8SToomas Soome
267199767f8SToomas Soome static char *
number(char * s,uint32_t * n)26838005992SToomas Soome number(char *s, uint32_t *n)
269199767f8SToomas Soome {
270199767f8SToomas Soome for (*n = 0; isdigit(*s); s++)
271199767f8SToomas Soome *n = (*n * 10) + *s - '0';
272e78c3bfbSToomas Soome return (s);
273199767f8SToomas Soome }
274199767f8SToomas Soome
275199767f8SToomas Soome n_long
ip_convertaddr(char * p)276199767f8SToomas Soome ip_convertaddr(char *p)
277199767f8SToomas Soome {
278e78c3bfbSToomas Soome #define IP_ANYADDR 0
27938005992SToomas Soome uint32_t addr = 0, n;
280199767f8SToomas Soome
281e78c3bfbSToomas Soome if (p == NULL || *p == '\0')
282e78c3bfbSToomas Soome return (IP_ANYADDR);
283199767f8SToomas Soome p = number(p, &n);
284199767f8SToomas Soome addr |= (n << 24) & 0xff000000;
285199767f8SToomas Soome if (*p == '\0' || *p++ != '.')
286e78c3bfbSToomas Soome return (IP_ANYADDR);
287199767f8SToomas Soome p = number(p, &n);
288199767f8SToomas Soome addr |= (n << 16) & 0xff0000;
289199767f8SToomas Soome if (*p == '\0' || *p++ != '.')
290e78c3bfbSToomas Soome return (IP_ANYADDR);
291199767f8SToomas Soome p = number(p, &n);
292199767f8SToomas Soome addr |= (n << 8) & 0xff00;
293199767f8SToomas Soome if (*p == '\0' || *p++ != '.')
294e78c3bfbSToomas Soome return (IP_ANYADDR);
295199767f8SToomas Soome p = number(p, &n);
296199767f8SToomas Soome addr |= n & 0xff;
297199767f8SToomas Soome if (*p != '\0')
298e78c3bfbSToomas Soome return (IP_ANYADDR);
299199767f8SToomas Soome
300e78c3bfbSToomas Soome return (htonl(addr));
301199767f8SToomas Soome }
302