--- /dev/null
+/******************************************************************************
+ * Copyright (c) 2004, 2008 IBM Corporation
+ * All rights reserved.
+ * This program and the accompanying materials
+ * are made available under the terms of the BSD License
+ * which accompanies this distribution, and is available at
+ * http://www.opensource.org/licenses/bsd-license.php
+ *
+ * Contributors:
+ * IBM Corporation - initial implementation
+ *****************************************************************************/
+
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <time.h>
+
+#include <ethernet.h>
+#include <ipv4.h>
+#include <udp.h>
+#include <dhcp.h>
+
+#define DEBUG 0
+
+static char * response_buffer;
+
+#if DEBUG
+static void
+print_ip(char *ip)
+{
+ printf("%d.%d.%d.%d\n", ip[0], ip[1], ip[2], ip[3]);
+}
+#endif
+
+/* IP header checksum calculation */
+static unsigned short
+checksum(unsigned short *packet, int words)
+{
+ unsigned long checksum;
+ for (checksum = 0; words > 0; words--)
+ checksum += *packet++;
+ checksum = (checksum >> 16) + (checksum & 0xffff);
+ checksum += (checksum >> 16);
+ return ~checksum;
+}
+
+
+static int
+send_bootp(filename_ip_t * fn_ip)
+{
+#if DEBUG
+ int i;
+#endif
+ unsigned int packetsize =
+ sizeof(struct iphdr) + sizeof(struct ethhdr) +
+ sizeof(struct udphdr) + sizeof(struct btphdr);
+ unsigned char packet[packetsize];
+ struct iphdr *iph;
+ struct udphdr *udph;
+ struct btphdr *btph;
+
+ iph = (struct iphdr *) packet;
+ udph = (struct udphdr *) (iph + 1);
+ btph = (struct btphdr *) (udph + 1);
+
+ memset(packet, 0, packetsize);
+
+ fill_iphdr((uint8_t *) iph, htons(packetsize - sizeof(struct ethhdr)),
+ IPTYPE_UDP, 0, fn_ip->server_ip);
+ fill_udphdr((uint8_t *) udph,
+ htons(sizeof(struct udphdr) + sizeof(struct btphdr)),
+ htons(UDPPORT_BOOTPC), htons(UDPPORT_BOOTPS));
+ btph->op = 1;
+ btph->htype = 1;
+ btph->hlen = 6;
+ strcpy((char *) btph->file, "bla");
+ memcpy(btph->chaddr, get_mac_address(), 6);
+
+#if DEBUG
+ printf("Sending packet\n");
+ printf("Packet is ");
+ for (i = 0; i < packetsize; i++)
+ printf(" %02x", packet[i]);
+ printf(".\n");
+#endif
+
+ send_ipv4(fn_ip->fd, packet, iph->ip_len);
+#if DEBUG
+ printf("%d bytes transmitted over socket.\n", i);
+#endif
+
+ return 0;
+}
+
+
+static int
+receive_bootp(filename_ip_t * fn_ip)
+{
+ int len, old_sum;
+ unsigned int packetsize = 2000;
+ unsigned char packet[packetsize];
+ struct iphdr *iph;
+ struct udphdr *udph;
+ struct btphdr *btph;
+
+#if DEBUG
+ struct ethhdr *ethh;
+ ethh = (struct ethhdr *) packet;
+#endif
+
+ iph = (struct iphdr *) (packet + sizeof(struct ethhdr));
+ udph = (struct udphdr *) (iph + 1);
+ btph = (struct btphdr *) (udph + 1);
+
+ memset(packet, 0, packetsize);
+
+ /* setting up a timer with a timeout of one second */
+ set_timer(TICKS_SEC);
+
+ do {
+
+ /* let's receive a packet */
+ len = recv(fn_ip->fd, packet, packetsize, 0);
+
+#if DEBUG
+ int j;
+ printf("%d bytes received, %d expected \n", len, packetsize);
+ if (len == 346) {
+ printf("Rec packet\n");
+ printf("Packet is ");
+ for (j = 0; j < len; j++) {
+ if (j % 16 == 0)
+ printf("\n");
+ printf(" %02x", packet[j]);
+ }
+ printf(".\n");
+ }
+#endif
+ if (len == 0)
+ continue;
+
+ /* check if the ip checksum is correct */
+ old_sum = iph->ip_sum;
+ iph->ip_sum = 0x00;
+ if (old_sum !=
+ checksum((unsigned short *) iph, sizeof(struct iphdr) >> 1))
+ /* checksum failed */
+ continue;
+ /* is it a udp packet */
+ if (iph->ip_p != IPTYPE_UDP)
+ continue;
+ /* check if the source port and destination port and the packet
+ * say that it is a bootp answer */
+ if (udph->uh_dport != htons(UDPPORT_BOOTPC) || udph->uh_sport != htons(UDPPORT_BOOTPS))
+ continue;
+ /* check if it is a Boot Reply */
+ if (btph->op != 2)
+ continue;
+ /* Comparing our mac address with the one in the bootp reply */
+ if (memcmp(get_mac_address(), btph->chaddr, ETH_ALEN))
+ continue;
+
+ if(response_buffer)
+ memcpy(response_buffer, btph, 1720);
+
+ fn_ip->own_ip = btph->yiaddr;
+ fn_ip->server_ip = btph->siaddr;
+ strcpy((char *) fn_ip->filename, (char *) btph->file);
+
+#if DEBUG
+ printf("\nThese are the details of the bootp reply:\n");
+ printf("Our IP address: ");
+ print_ip((char*) &fn_ip->own_ip);
+ printf("Next server IP address: ");
+ print_ip((char*) &fn_ip->server_ip);
+ printf("Boot file name: %s\n", btph->file);
+ printf("Packet is: %s\n", btph->file);
+ for (j = 0; j < len; j++) {
+ if (j % 16 == 0)
+ printf("\n");
+ printf(" %02x", packet[j]);
+ }
+ printf(".\n");
+ printf("fn_ip->own_mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
+ get_mac_address()[0], get_mac_address()[1],
+ get_mac_address()[2], get_mac_address()[3],
+ get_mac_address()[4], get_mac_address()[5]);
+ printf("Header ethh->dest_mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
+ ethh->dest_mac[0], ethh->dest_mac[1], ethh->dest_mac[2],
+ ethh->dest_mac[3], ethh->dest_mac[4], ethh->dest_mac[5]);
+ printf("Header ethh->src_mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
+ ethh->src_mac[0], ethh->src_mac[1], ethh->src_mac[2],
+ ethh->src_mac[3], ethh->src_mac[4], ethh->src_mac[5]);
+ printf("Header ethh->typ: %x\n",ethh->type);
+ printf("Header iph->ip_hlv: %x\n",iph->ip_hlv);
+ printf("Header iph->ip_len: %x\n",iph->ip_len);
+ printf("Header iph->ip_id: %x\n",iph->ip_id);
+ printf("Header iph->ip_off: %x\n",iph->ip_off);
+ printf("Header iph->ip_ttl: %x\n",iph->ip_ttl);
+ printf("Header iph->ip_p: %x\n",iph->ip_p);
+ printf("Header iph->ip_sum: %x\n",iph->ip_sum);
+ printf("Header iph->ip_src: %x\n",iph->ip_src);
+ printf("Header iph->ip_dst: %x\n",iph->ip_dst);
+
+ printf("Header btph->op: %x\n",btph->op);
+ printf("Header btph->htype: %x\n",btph->htype);
+ printf("Header btph->hlen: %x\n",btph->hlen);
+ printf("Header btph->hops: %x\n",btph->hops);
+ printf("Header btph->xid: %x\n",btph->xid);
+ printf("Header btph->secs: %x\n",btph->secs);
+ printf("Header btph->ciaddr: %x\n",btph->ciaddr);
+ printf("Header btph->yiaddr: %x\n",btph->yiaddr);
+ printf("Header btph->siaddr: %x\n",btph->siaddr);
+ printf("Header btph->giaddr: %x\n",btph->giaddr);
+
+ printf("Header btph->chaddr: %02x:%02x:%02x:%02x:%02x:%02x:\n",
+ btph->chaddr[0], btph->chaddr[1], btph->chaddr[2],
+ btph->chaddr[3], btph->chaddr[4], btph->chaddr[5]);
+#endif
+ return 0;
+
+ /* only do this for the time specified during set_timer() */
+ } while (get_timer() > 0);
+ return -1;
+}
+
+
+int
+bootp(char *ret_buffer, filename_ip_t * fn_ip, unsigned int retries)
+{
+ int i = (int) retries+1;
+ fn_ip->own_ip = 0;
+
+ printf(" ");
+
+ response_buffer = ret_buffer;
+
+ do {
+ printf("\b\b%02d", i);
+ if (!i--) {
+ printf("\nGiving up after %d bootp requests\n",
+ retries+1);
+ return -1;
+ }
+ send_bootp(fn_ip);
+ /* if the timer in receive_bootp expired it will return
+ * -1 and we will just send another bootp request just
+ * in case the previous one was lost. And because we don't
+ * trust the network cable we keep on doing this 30 times */
+ } while (receive_bootp(fn_ip) != 0);
+ printf("\b\b\b");
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff