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1.1 nbrk 1: /* $OpenBSD: etherfun.c,v 1.3 2001/09/20 17:02:31 mpech Exp $ */
2:
3: /*
4: *
5: * Copyright (c) 1995 Charles D. Cranor and Seth Widoff
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by Charles D. Cranor
19: * and Seth Widoff.
20: * 4. The name of the author may not be used to endorse or promote products
21: * derived from this software without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33: */
34: /* etherfun.c */
35:
36: #include <sys/cdefs.h>
37: #include "sboot.h"
38: #include "etherfun.h"
39:
40: /* Construct and send a rev arp packet */
41: void
42: do_rev_arp()
43: {
44: int i;
45:
46: for (i = 0; i < 6; i++)
47: eh->ether_dhost[i] = 0xff;
48:
49: bcopy(myea, eh->ether_shost, 6);
50: eh->ether_type = ETYPE_RARP;
51:
52: rarp->ar_hrd = 1; /* hardware type is 1 */
53: rarp->ar_pro = PTYPE_IP;
54: rarp->ar_hln = 6; /* length of hardware address is 6 bytes */
55: rarp->ar_pln = 4; /* length of ip address is 4 byte */
56: rarp->ar_op = OPCODE_RARP;
57: bcopy(myea, rarp->arp_sha, sizeof(myea));
58: bcopy(myea, rarp->arp_tha, sizeof(myea));
59: for (i = 0; i < 4; i++)
60: rarp->arp_spa[i] = rarp->arp_tpa[i] = 0x00;
61:
62: le_put(buf, 76);
63: }
64:
65: /* Receive and disassemble the rev_arp reply */
66: int
67: get_rev_arp()
68: {
69: le_get(buf, sizeof(buf), 6);
70: if (eh->ether_type == ETYPE_RARP && rarp->ar_op == OPCODE_REPLY) {
71: bcopy(rarp->arp_tpa, myip, sizeof(rarp->arp_tpa));
72: bcopy(rarp->arp_spa, servip, sizeof(rarp->arp_spa));
73: bcopy(rarp->arp_sha, servea, sizeof(rarp->arp_sha));
74: return (1);
75: }
76: return (0);
77: }
78:
79: /* Try to get a reply to a rev arp request */
80: int
81: rev_arp()
82: {
83: int tries = 0;
84: while (tries < 5) {
85: do_rev_arp();
86: if (get_rev_arp())
87: return (1);
88: tries++;
89: }
90: return (0);
91: }
92:
93: /*
94: * Send a tftp read request or acknowledgement
95: * mesgtype 0 is a read request, 1 is an
96: * acknowledgement
97: */
98: void
99: do_send_tftp(mesgtype)
100: int mesgtype;
101: {
102: u_long res, iptmp, lcv;
103: char *tot;
104:
105: if (mesgtype == 0) {
106: tot = tftp_r + (sizeof(MSG) - 1);
107: myport = (u_short) time();
108: if (myport < 1000)
109: myport += 1000;
110: servport = FTP_PORT; /* to start */
111: } else {
112: tot = (char *) tftp_a + 4;
113: }
114:
115: bcopy(servea, eh->ether_dhost, sizeof(servea));
116: bcopy(myea, eh->ether_shost, sizeof(myea));
117: eh->ether_type = ETYPE_IP;
118:
119: iph->ip_v = IP_VERSION;
120: iph->ip_hl = IP_HLEN;
121: iph->ip_tos = 0; /* type of service is 0 */
122: iph->ip_id = 0; /* id field is 0 */
123: iph->ip_off = IP_DF;
124: iph->ip_ttl = 3; /* time to live is 3 seconds/hops */
125: iph->ip_p = IPP_UDP;
126: bcopy(myip, iph->ip_src, sizeof(myip));
127: bcopy(servip, iph->ip_dst, sizeof(servip));
128: iph->ip_sum = 0;
129: iph->ip_len = tot - (char *) iph;
130: res = oc_cksum(iph, sizeof(struct ip), 0);
131: iph->ip_sum = 0xffff & ~res;
132: udph->uh_sport = myport;
133: udph->uh_dport = servport;
134: udph->uh_sum = 0;
135:
136: if (mesgtype) {
137: tftp_a->op_code = FTPOP_ACKN;
138: tftp_a->block = (u_short) (mesgtype);
139: } else {
140: bcopy(myip, &iptmp, sizeof(iptmp));
141: bcopy(MSG, tftp_r, (sizeof(MSG) - 1));
142: for (lcv = 9; lcv >= 2; lcv--) {
143: tftp_r[lcv] = "0123456789ABCDEF"[iptmp & 0xF];
144:
145: iptmp = iptmp >> 4;
146: }
147: }
148:
149: udph->uh_ulen = tot - (char *) udph;
150:
151: le_put(buf, tot - buf);
152: }
153:
154: /* Attempt to tftp a file and read it into memory */
155: int
156: do_get_file()
157: {
158: int fail = 0, oldlen;
159: char *loadat = (char *) LOAD_ADDR;
160: last_ack = 0;
161:
162: do_send_tftp(READ);
163: while (1) {
164: if (le_get(buf, sizeof(buf), 5) == 0) {
165: /* timeout occurred */
166: if (last_ack)
167: do_send_tftp(last_ack);
168: else
169: do_send_tftp(READ);
170:
171: fail++;
172: if (fail > 5) {
173: printf("\n");
174: return (1);
175: }
176: } else {
177: printf("%x \r", tftp->info.block * 512);
178: if ((eh->ether_type != ETYPE_IP) || (iph->ip_p != IPP_UDP)) {
179: fail++;
180: continue;
181: }
182: if (servport == FTP_PORT)
183: servport = udph->uh_sport;
184: if (tftp->info.op_code == FTPOP_ERR) {
185: printf("TFTP: Download error %d: %s\n",
186: tftp->info.block, tftp->data);
187: return (1);
188: }
189: if (tftp->info.block != last_ack + 1) {
190: /* we received the wrong block */
191: if (tftp->info.block < last_ack + 1) {
192: /* nack whatever we received */
193: do_send_tftp(tftp->info.block);
194: } else {
195: /* nack the last confirmed block */
196: do_send_tftp(last_ack);
197: }
198: fail++;
199: } else {/* we got the right block */
200: fail = 0;
201: last_ack++;
202: oldlen = udph->uh_ulen;
203: do_send_tftp(last_ack);
204: /* printf("bcopy %x %x %d\n", &tftp->data,
205: * loadat, oldlen - 12); */
206: bcopy(&tftp->data, loadat, oldlen - 12);
207: loadat += oldlen - 12;
208: if (oldlen < (8 + 4 + 512)) {
209: printf("\n");
210: return (0);
211: }
212: }
213: }
214: }
215: printf("\n");
216: return (0);
217: }