Annotation of sys/arch/i386/stand/pxeboot/net.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: net.c,v 1.1 2004/03/19 13:48:19 tom Exp $ */
! 2: /* $NetBSD: net.c,v 1.14 1996/10/13 02:29:02 christos Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1992 Regents of the University of California.
! 6: * All rights reserved.
! 7: *
! 8: * This software was developed by the Computer Systems Engineering group
! 9: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 10: * contributed to Berkeley.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the University of
! 23: * California, Lawrence Berkeley Laboratory and its contributors.
! 24: * 4. Neither the name of the University nor the names of its contributors
! 25: * may be used to endorse or promote products derived from this software
! 26: * without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 29: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 30: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 31: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 32: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 33: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 34: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 35: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 36: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 37: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 38: * SUCH DAMAGE.
! 39: *
! 40: * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
! 41: */
! 42:
! 43: #include <sys/param.h>
! 44: #include <sys/socket.h>
! 45:
! 46: #include <net/if.h>
! 47: #include <netinet/in.h>
! 48:
! 49: #include <netinet/in.h>
! 50: #include <netinet/if_ether.h>
! 51: #include <netinet/in_systm.h>
! 52: #include <netinet/ip.h>
! 53: #include <netinet/ip_var.h>
! 54: #include <netinet/udp.h>
! 55: #include <netinet/udp_var.h>
! 56:
! 57: #include <lib/libsa/stand.h>
! 58: #include <lib/libsa/net.h>
! 59:
! 60: #include <pxeboot.h>
! 61:
! 62: /* Caller must leave room for ethernet, ip and udp headers in front!! */
! 63: ssize_t
! 64: sendudp(struct iodesc *d, void *pkt, size_t len)
! 65: {
! 66: return pxesendudp(d, pkt, len);
! 67: }
! 68:
! 69: /*
! 70: * Receive a UDP packet and validate it is for us.
! 71: * Caller leaves room for the headers (Ether, IP, UDP)
! 72: */
! 73: ssize_t
! 74: readudp(struct iodesc *d, void *pkt, size_t len, time_t tleft)
! 75: {
! 76: return pxereadudp(d, pkt, len, tleft);
! 77: }
! 78:
! 79: /*
! 80: * Send a packet and wait for a reply, with exponential backoff.
! 81: *
! 82: * The send routine must return the actual number of bytes written.
! 83: *
! 84: * The receive routine can indicate success by returning the number of
! 85: * bytes read; it can return 0 to indicate EOF; it can return -1 with a
! 86: * non-zero errno to indicate failure; finally, it can return -1 with a
! 87: * zero errno to indicate it isn't done yet.
! 88: */
! 89: ssize_t
! 90: sendrecv(struct iodesc *d, ssize_t (*sproc)(struct iodesc *, void *, size_t),
! 91: void *sbuf, size_t ssize,
! 92: ssize_t (*rproc)(struct iodesc *, void *, size_t, time_t),
! 93: void *rbuf, size_t rsize)
! 94: {
! 95: ssize_t cc;
! 96: time_t t, tmo, tlast;
! 97: long tleft;
! 98:
! 99: #ifdef NET_DEBUG
! 100: if (debug)
! 101: printf("sendrecv: called\n");
! 102: #endif
! 103:
! 104: tmo = MINTMO;
! 105: tlast = tleft = 0;
! 106: t = getsecs();
! 107: for (;;) {
! 108: if (tleft <= 0) {
! 109: if (tmo >= MAXTMO) {
! 110: errno = ETIMEDOUT;
! 111: return -1;
! 112: }
! 113: cc = (*sproc)(d, sbuf, ssize);
! 114: if (cc < 0 || (size_t)cc < ssize)
! 115: panic("sendrecv: short write! (%d < %d)",
! 116: cc, ssize);
! 117:
! 118: tleft = tmo;
! 119: tmo <<= 1;
! 120: if (tmo > MAXTMO)
! 121: tmo = MAXTMO;
! 122: tlast = t;
! 123: }
! 124:
! 125: /* Try to get a packet and process it. */
! 126: cc = (*rproc)(d, rbuf, rsize, tleft);
! 127: /* Return on data, EOF or real error. */
! 128: if (cc != -1 || errno != 0)
! 129: return (cc);
! 130:
! 131: /* Timed out or didn't get the packet we're waiting for */
! 132: t = getsecs();
! 133: tleft -= t - tlast;
! 134: tlast = t;
! 135: }
! 136: }
! 137:
! 138: /*
! 139: * Like inet_addr() in the C library, but we only accept base-10.
! 140: * Return values are in network order.
! 141: */
! 142: n_long
! 143: inet_addr(char *cp)
! 144: {
! 145: u_long val;
! 146: int n;
! 147: char c;
! 148: u_int parts[4];
! 149: u_int *pp = parts;
! 150:
! 151: for (;;) {
! 152: /*
! 153: * Collect number up to ``.''.
! 154: * Values are specified as for C:
! 155: * 0x=hex, 0=octal, other=decimal.
! 156: */
! 157: val = 0;
! 158: while ((c = *cp) != '\0') {
! 159: if (c >= '0' && c <= '9') {
! 160: val = (val * 10) + (c - '0');
! 161: cp++;
! 162: continue;
! 163: }
! 164: break;
! 165: }
! 166: if (*cp == '.') {
! 167: /*
! 168: * Internet format:
! 169: * a.b.c.d
! 170: * a.b.c (with c treated as 16-bits)
! 171: * a.b (with b treated as 24 bits)
! 172: */
! 173: if (pp >= parts + 3 || val > 0xff)
! 174: goto bad;
! 175: *pp++ = val, cp++;
! 176: } else
! 177: break;
! 178: }
! 179: /*
! 180: * Check for trailing characters.
! 181: */
! 182: if (*cp != '\0')
! 183: goto bad;
! 184:
! 185: /*
! 186: * Concoct the address according to
! 187: * the number of parts specified.
! 188: */
! 189: n = pp - parts + 1;
! 190: switch (n) {
! 191:
! 192: case 1: /* a -- 32 bits */
! 193: break;
! 194:
! 195: case 2: /* a.b -- 8.24 bits */
! 196: if (val > 0xffffff)
! 197: goto bad;
! 198: val |= parts[0] << 24;
! 199: break;
! 200:
! 201: case 3: /* a.b.c -- 8.8.16 bits */
! 202: if (val > 0xffff)
! 203: goto bad;
! 204: val |= (parts[0] << 24) | (parts[1] << 16);
! 205: break;
! 206:
! 207: case 4: /* a.b.c.d -- 8.8.8.8 bits */
! 208: if (val > 0xff)
! 209: goto bad;
! 210: val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
! 211: break;
! 212: }
! 213:
! 214: return (htonl(val));
! 215: bad:
! 216: return (htonl(INADDR_NONE));
! 217: }
! 218:
! 219: char *
! 220: inet_ntoa(struct in_addr ia)
! 221: {
! 222: return (intoa(ia.s_addr));
! 223: }
! 224:
! 225: /* Similar to inet_ntoa() */
! 226: char *
! 227: intoa(n_long addr)
! 228: {
! 229: char *cp;
! 230: u_int byte;
! 231: int n;
! 232: static char buf[sizeof(".255.255.255.255")];
! 233:
! 234: NTOHL(addr);
! 235: cp = &buf[sizeof buf];
! 236: *--cp = '\0';
! 237:
! 238: n = 4;
! 239: do {
! 240: byte = addr & 0xff;
! 241: *--cp = byte % 10 + '0';
! 242: byte /= 10;
! 243: if (byte > 0) {
! 244: *--cp = byte % 10 + '0';
! 245: byte /= 10;
! 246: if (byte > 0)
! 247: *--cp = byte + '0';
! 248: }
! 249: *--cp = '.';
! 250: addr >>= 8;
! 251: } while (--n > 0);
! 252:
! 253: return (cp+1);
! 254: }
! 255:
! 256: static char *
! 257: number(char *s, int *n)
! 258: {
! 259: for (*n = 0; isdigit(*s); s++)
! 260: *n = (*n * 10) + *s - '0';
! 261: return s;
! 262: }
! 263:
! 264: n_long
! 265: ip_convertaddr(char *p)
! 266: {
! 267: #define IP_ANYADDR 0
! 268: n_long addr = 0, n;
! 269:
! 270: if (p == (char *)0 || *p == '\0')
! 271: return IP_ANYADDR;
! 272: p = number(p, &n);
! 273: addr |= (n << 24) & 0xff000000;
! 274: if (*p == '\0' || *p++ != '.')
! 275: return IP_ANYADDR;
! 276: p = number(p, &n);
! 277: addr |= (n << 16) & 0xff0000;
! 278: if (*p == '\0' || *p++ != '.')
! 279: return IP_ANYADDR;
! 280: p = number(p, &n);
! 281: addr |= (n << 8) & 0xff00;
! 282: if (*p == '\0' || *p++ != '.')
! 283: return IP_ANYADDR;
! 284: p = number(p, &n);
! 285: addr |= n & 0xff;
! 286: if (*p != '\0')
! 287: return IP_ANYADDR;
! 288:
! 289: return htonl(addr);
! 290: }
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