1 /* $NetBSD: net.c,v 1.20 1997/12/26 22:41:30 scottr Exp $ */
4 * Copyright (c) 1992 Regents of the University of California.
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/socket.h>
47 #include <netinet/in.h>
48 #include <netinet/if_ether.h>
49 #include <netinet/in_systm.h>
51 #include <netinet/ip.h>
52 #include <netinet/ip_var.h>
53 #include <netinet/udp.h>
54 #include <netinet/udp_var.h>
60 * Maximum wait time for sending and receiving before we give up and timeout.
61 * If set to 0, operations will eventually timeout completely, but send/recv
62 * timeouts must progress exponentially from MINTMO to MAXTMO before final
66 #define MAXWAIT 300 /* seconds */
70 #error MAXWAIT must not be a negative number
74 * Send a packet and wait for a reply, with exponential backoff.
76 * The send routine must return the actual number of bytes written,
79 * The receive routine can indicate success by returning the number of
80 * bytes read; it can return 0 to indicate EOF; it can return -1 with a
81 * non-zero errno to indicate failure; finally, it can return -1 with a
82 * zero errno to indicate it isn't done yet.
85 sendrecv(struct iodesc *d,
86 ssize_t (*sproc)(struct iodesc *, void *, size_t),
87 void *sbuf, size_t ssize,
88 ssize_t (*rproc)(struct iodesc *, void **, void **, time_t, void *),
89 void **pkt, void **payload, void *recv_extra)
98 printf("sendrecv: called\n");
107 if (MAXWAIT > 0 && (getsecs() - tref) >= MAXWAIT) {
116 cc = (*sproc)(d, sbuf, ssize);
117 if (cc != -1 && cc < ssize)
118 panic("sendrecv: short write! (%zd < %zd)",
127 /* Error on transmit; wait before retrying */
128 while ((getsecs() - t) < tmo)
137 /* Try to get a packet and process it. */
138 cc = (*rproc)(d, pkt, payload, tleft, recv_extra);
139 /* Return on data, EOF or real error. */
140 if (cc != -1 || (errno != 0 && errno != ETIMEDOUT))
143 /* Timed out or didn't get the packet we're waiting for */
151 * Like inet_addr() in the C library, but we only accept base-10.
152 * Return values are in network order.
165 * Collect number up to ``.''.
166 * Values are specified as for C:
167 * 0x=hex, 0=octal, other=decimal.
170 while ((c = *cp) != '\0') {
171 if (c >= '0' && c <= '9') {
172 val = (val * 10) + (c - '0');
182 * a.b.c (with c treated as 16-bits)
183 * a.b (with b treated as 24 bits)
185 if (pp >= parts + 3 || val > 0xff)
192 * Check for trailing characters.
198 * Concoct the address according to
199 * the number of parts specified.
204 case 1: /* a -- 32 bits */
207 case 2: /* a.b -- 8.24 bits */
210 val |= parts[0] << 24;
213 case 3: /* a.b.c -- 8.8.16 bits */
216 val |= (parts[0] << 24) | (parts[1] << 16);
219 case 4: /* a.b.c.d -- 8.8.8.8 bits */
222 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
228 return (htonl(INADDR_NONE));
232 inet_ntoa(struct in_addr ia)
234 return (intoa(ia.s_addr));
237 /* Similar to inet_ntoa() */
244 static char buf[17]; /* strlen(".255.255.255.255") + 1 */
247 cp = &buf[sizeof buf];
253 *--cp = byte % 10 + '0';
256 *--cp = byte % 10 + '0';
269 number(char *s, n_long *n)
271 for (*n = 0; isdigit(*s); s++)
272 *n = (*n * 10) + *s - '0';
277 ip_convertaddr(char *p)
282 if (p == NULL || *p == '\0')
285 addr |= (n << 24) & 0xff000000;
286 if (*p == '\0' || *p++ != '.')
289 addr |= (n << 16) & 0xff0000;
290 if (*p == '\0' || *p++ != '.')
293 addr |= (n << 8) & 0xff00;
294 if (*p == '\0' || *p++ != '.')