This is libstand; a support library for standalone executables (eg. bootstrap

modules).
Obtained from: NetBSD, with some architectural changes and many additions.

1 files changed, 503 insertions, 0 deletions

diff --git a/lib/libstand/net.c b/lib/libstand/net.c
new file mode 100644
index 0000000..978bd70
--- /dev/null
+++ b/lib/libstand/net.c
@@ -0,0 +1,503 @@
+/*	$NetBSD: net.c,v 1.20 1997/12/26 22:41:30 scottr Exp $	*/
+
+/*
+ * Copyright (c) 1992 Regents of the University of California.
+ * All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Lawrence Berkeley Laboratory and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp  (LBL)
+ */
+
+#include <sys/param.h>
+#include <sys/socket.h>
+
+#include <string.h>
+
+#include <net/if.h>
+#include <netinet/in.h>
+#include <netinet/if_ether.h>
+#include <netinet/in_systm.h>
+
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+
+#include "stand.h"
+#include "net.h"
+
+/* Caller must leave room for ethernet, ip and udp headers in front!! */
+ssize_t
+sendudp(d, pkt, len)
+	register struct iodesc *d;
+	register void *pkt;
+	register size_t len;
+{
+	register ssize_t cc;
+	register struct ip *ip;
+	register struct udphdr *uh;
+	register u_char *ea;
+
+#ifdef NET_DEBUG
+ 	if (debug) {
+		printf("sendudp: d=%lx called.\n", (long)d);
+		if (d) {
+			printf("saddr: %s:%d",
+			    inet_ntoa(d->myip), ntohs(d->myport));
+			printf(" daddr: %s:%d\n",
+			    inet_ntoa(d->destip), ntohs(d->destport));
+		}
+	}
+#endif
+
+	uh = (struct udphdr *)pkt - 1;
+	ip = (struct ip *)uh - 1;
+	len += sizeof(*ip) + sizeof(*uh);
+
+	bzero(ip, sizeof(*ip) + sizeof(*uh));
+
+	ip->ip_v = IPVERSION;			/* half-char */
+	ip->ip_hl = sizeof(*ip) >> 2;		/* half-char */
+	ip->ip_len = htons(len);
+	ip->ip_p = IPPROTO_UDP;			/* char */
+	ip->ip_ttl = IP_TTL;			/* char */
+	ip->ip_src = d->myip;
+	ip->ip_dst = d->destip;
+	ip->ip_sum = in_cksum(ip, sizeof(*ip));	 /* short, but special */
+
+	uh->uh_sport = d->myport;
+	uh->uh_dport = d->destport;
+	uh->uh_ulen = htons(len - sizeof(*ip));
+
+#ifndef UDP_NO_CKSUM
+	{
+		register struct udpiphdr *ui;
+		struct ip tip;
+
+		/* Calculate checksum (must save and restore ip header) */
+		tip = *ip;
+		ui = (struct udpiphdr *)ip;
+		bzero(&ui->ui_x1, sizeof(ui->ui_x1));
+		ui->ui_len = uh->uh_ulen;
+		uh->uh_sum = in_cksum(ui, len);
+		*ip = tip;
+	}
+#endif
+
+	if (ip->ip_dst.s_addr == INADDR_BROADCAST || ip->ip_src.s_addr == 0 ||
+	    netmask == 0 || SAMENET(ip->ip_src, ip->ip_dst, netmask))
+		ea = arpwhohas(d, ip->ip_dst);
+	else
+		ea = arpwhohas(d, gateip);
+
+	cc = sendether(d, ip, len, ea, ETHERTYPE_IP);
+	if (cc == -1)
+		return (-1);
+	if (cc != len)
+		panic("sendudp: bad write (%d != %d)", cc, len);
+	return (cc - (sizeof(*ip) + sizeof(*uh)));
+}
+
+/*
+ * Receive a UDP packet and validate it is for us.
+ * Caller leaves room for the headers (Ether, IP, UDP)
+ */
+ssize_t
+readudp(d, pkt, len, tleft)
+	register struct iodesc *d;
+	register void *pkt;
+	register size_t len;
+	time_t tleft;
+{
+	register ssize_t n;
+	register size_t hlen;
+	register struct ip *ip;
+	register struct udphdr *uh;
+	u_int16_t etype;	/* host order */
+
+#ifdef NET_DEBUG
+	if (debug)
+		printf("readudp: called\n");
+#endif
+
+	uh = (struct udphdr *)pkt - 1;
+	ip = (struct ip *)uh - 1;
+
+	n = readether(d, ip, len + sizeof(*ip) + sizeof(*uh), tleft, &etype);
+	if (n == -1 || n < sizeof(*ip) + sizeof(*uh))
+		return -1;
+
+	/* Ethernet address checks now in readether() */
+
+	/* Need to respond to ARP requests. */
+	if (etype == ETHERTYPE_ARP) {
+		struct arphdr *ah = (void *)ip;
+		if (ah->ar_op == htons(ARPOP_REQUEST)) {
+			/* Send ARP reply */
+			arp_reply(d, ah);
+		}
+		return -1;
+	}
+
+	if (etype != ETHERTYPE_IP) {
+#ifdef NET_DEBUG
+		if (debug)
+			printf("readudp: not IP. ether_type=%x\n", etype);
+#endif
+		return -1;
+	}
+
+	/* Check ip header */
+	if (ip->ip_v != IPVERSION ||
+	    ip->ip_p != IPPROTO_UDP) {	/* half char */
+#ifdef NET_DEBUG
+		if (debug)
+			printf("readudp: IP version or not UDP. ip_v=%d ip_p=%d\n", ip->ip_v, ip->ip_p);
+#endif
+		return -1;
+	}
+
+	hlen = ip->ip_hl << 2;
+	if (hlen < sizeof(*ip) ||
+	    in_cksum(ip, hlen) != 0) {
+#ifdef NET_DEBUG
+		if (debug)
+			printf("readudp: short hdr or bad cksum.\n");
+#endif
+		return -1;
+	}
+	if (n < ntohs(ip->ip_len)) {
+#ifdef NET_DEBUG
+		if (debug)
+			printf("readudp: bad length %d < %d.\n",
+			       (int)n, ntohs(ip->ip_len));
+#endif
+		return -1;
+	}
+	if (d->myip.s_addr && ip->ip_dst.s_addr != d->myip.s_addr) {
+#ifdef NET_DEBUG
+		if (debug) {
+			printf("readudp: bad saddr %s != ", inet_ntoa(d->myip));
+			printf("%s\n", inet_ntoa(ip->ip_dst));
+		}
+#endif
+		return -1;
+	}
+
+	/* If there were ip options, make them go away */
+	if (hlen != sizeof(*ip)) {
+		bcopy(((u_char *)ip) + hlen, uh, len - hlen);
+		ip->ip_len = htons(sizeof(*ip));
+		n -= hlen - sizeof(*ip);
+	}
+	if (uh->uh_dport != d->myport) {
+#ifdef NET_DEBUG
+		if (debug)
+			printf("readudp: bad dport %d != %d\n",
+				d->myport, ntohs(uh->uh_dport));
+#endif
+		return -1;
+	}
+
+#ifndef UDP_NO_CKSUM
+	if (uh->uh_sum) {
+		register struct udpiphdr *ui;
+		struct ip tip;
+
+		n = ntohs(uh->uh_ulen) + sizeof(*ip);
+		if (n > RECV_SIZE - ETHER_SIZE) {
+			printf("readudp: huge packet, udp len %d\n", (int)n);
+			return -1;
+		}
+
+		/* Check checksum (must save and restore ip header) */
+		tip = *ip;
+		ui = (struct udpiphdr *)ip;
+		bzero(&ui->ui_x1, sizeof(ui->ui_x1));
+		ui->ui_len = uh->uh_ulen;
+		if (in_cksum(ui, n) != 0) {
+#ifdef NET_DEBUG
+			if (debug)
+				printf("readudp: bad cksum\n");
+#endif
+			*ip = tip;
+			return -1;
+		}
+		*ip = tip;
+	}
+#endif
+	if (ntohs(uh->uh_ulen) < sizeof(*uh)) {
+#ifdef NET_DEBUG
+		if (debug)
+			printf("readudp: bad udp len %d < %d\n",
+				ntohs(uh->uh_ulen), (int)sizeof(*uh));
+#endif
+		return -1;
+	}
+
+	n -= sizeof(*ip) + sizeof(*uh);
+	return (n);
+}
+
+/*
+ * Send a packet and wait for a reply, with exponential backoff.
+ *
+ * The send routine must return the actual number of bytes written,
+ * or -1 on error.
+ *
+ * The receive routine can indicate success by returning the number of
+ * bytes read; it can return 0 to indicate EOF; it can return -1 with a
+ * non-zero errno to indicate failure; finally, it can return -1 with a
+ * zero errno to indicate it isn't done yet.
+ */
+ssize_t
+sendrecv(d, sproc, sbuf, ssize, rproc, rbuf, rsize)
+	register struct iodesc *d;
+	register ssize_t (*sproc)(struct iodesc *, void *, size_t);
+	register void *sbuf;
+	register size_t ssize;
+	register ssize_t (*rproc)(struct iodesc *, void *, size_t, time_t);
+	register void *rbuf;
+	register size_t rsize;
+{
+	register ssize_t cc;
+	register time_t t, tmo, tlast;
+	long tleft;
+
+#ifdef NET_DEBUG
+	if (debug)
+		printf("sendrecv: called\n");
+#endif
+
+	tmo = MINTMO;
+	tlast = tleft = 0;
+	t = getsecs();
+	for (;;) {
+		if (tleft <= 0) {
+			if (tmo >= MAXTMO) {
+				errno = ETIMEDOUT;
+				return -1;
+			}
+			cc = (*sproc)(d, sbuf, ssize);
+			if (cc != -1 && cc < ssize)
+				panic("sendrecv: short write! (%d < %d)",
+				    cc, ssize);
+
+			tleft = tmo;
+			tmo <<= 1;
+			if (tmo > MAXTMO)
+				tmo = MAXTMO;
+
+			if (cc == -1) {
+				/* Error on transmit; wait before retrying */
+				while ((getsecs() - t) < tmo);
+				tleft = 0;
+				continue;
+			}
+
+			tlast = t;
+		}
+
+		/* Try to get a packet and process it. */
+		cc = (*rproc)(d, rbuf, rsize, tleft);
+		/* Return on data, EOF or real error. */
+		if (cc != -1 || errno != 0)
+			return (cc);
+
+		/* Timed out or didn't get the packet we're waiting for */
+		t = getsecs();
+		tleft -= t - tlast;
+		tlast = t;
+	}
+}
+
+/*
+ * Like inet_addr() in the C library, but we only accept base-10.
+ * Return values are in network order.
+ */
+n_long
+inet_addr(cp)
+	char *cp;
+{
+	register u_long val;
+	register int n;
+	register char c;
+	u_int parts[4];
+	register u_int *pp = parts;
+
+	for (;;) {
+		/*
+		 * Collect number up to ``.''.
+		 * Values are specified as for C:
+		 * 0x=hex, 0=octal, other=decimal.
+		 */
+		val = 0;
+		while ((c = *cp) != '\0') {
+			if (c >= '0' && c <= '9') {
+				val = (val * 10) + (c - '0');
+				cp++;
+				continue;
+			}
+			break;
+		}
+		if (*cp == '.') {
+			/*
+			 * Internet format:
+			 *	a.b.c.d
+			 *	a.b.c	(with c treated as 16-bits)
+			 *	a.b	(with b treated as 24 bits)
+			 */
+			if (pp >= parts + 3 || val > 0xff)
+				goto bad;
+			*pp++ = val, cp++;
+		} else
+			break;
+	}
+	/*
+	 * Check for trailing characters.
+	 */
+	if (*cp != '\0')
+		goto bad;
+
+	/*
+	 * Concoct the address according to
+	 * the number of parts specified.
+	 */
+	n = pp - parts + 1;
+	switch (n) {
+
+	case 1:				/* a -- 32 bits */
+		break;
+
+	case 2:				/* a.b -- 8.24 bits */
+		if (val > 0xffffff)
+			goto bad;
+		val |= parts[0] << 24;
+		break;
+
+	case 3:				/* a.b.c -- 8.8.16 bits */
+		if (val > 0xffff)
+			goto bad;
+		val |= (parts[0] << 24) | (parts[1] << 16);
+		break;
+
+	case 4:				/* a.b.c.d -- 8.8.8.8 bits */
+		if (val > 0xff)
+			goto bad;
+		val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
+		break;
+	}
+
+	return (htonl(val));
+ bad:
+	return (htonl(INADDR_NONE));
+}
+
+char *
+inet_ntoa(ia)
+	struct in_addr ia;
+{
+	return (intoa(ia.s_addr));
+}
+
+/* Similar to inet_ntoa() */
+char *
+intoa(addr)
+	register n_long addr;
+{
+	register char *cp;
+	register u_int byte;
+	register int n;
+	static char buf[17];	/* strlen(".255.255.255.255") + 1 */
+
+	NTOHL(addr);
+	cp = &buf[sizeof buf];
+	*--cp = '\0';
+
+	n = 4;
+	do {
+		byte = addr & 0xff;
+		*--cp = byte % 10 + '0';
+		byte /= 10;
+		if (byte > 0) {
+			*--cp = byte % 10 + '0';
+			byte /= 10;
+			if (byte > 0)
+				*--cp = byte + '0';
+		}
+		*--cp = '.';
+		addr >>= 8;
+	} while (--n > 0);
+
+	return (cp+1);
+}
+
+static char *
+number(s, n)
+	char *s;
+	int *n;
+{
+	for (*n = 0; isdigit(*s); s++)
+		*n = (*n * 10) + *s - '0';
+	return s;
+}
+
+n_long
+ip_convertaddr(p)
+	char *p;
+{
+#define IP_ANYADDR	0
+	n_long addr = 0, n;
+
+	if (p == (char *)0 || *p == '\0')
+		return IP_ANYADDR;
+	p = number(p, &n);
+	addr |= (n << 24) & 0xff000000;
+	if (*p == '\0' || *p++ != '.')
+		return IP_ANYADDR;
+	p = number(p, &n);
+	addr |= (n << 16) & 0xff0000;
+	if (*p == '\0' || *p++ != '.')
+		return IP_ANYADDR;
+	p = number(p, &n);
+	addr |= (n << 8) & 0xff00;
+	if (*p == '\0' || *p++ != '.')
+		return IP_ANYADDR;
+	p = number(p, &n);
+	addr |= n & 0xff;
+	if (*p != '\0')
+		return IP_ANYADDR;
+
+	return htonl(addr);
+}