1 files changed, 257 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/core/gdbudp.c b/contrib/syslinux-4.02/gpxe/src/core/gdbudp.c
new file mode 100644
index 0000000..26feb38
--- /dev/null
+++ b/contrib/syslinux-4.02/gpxe/src/core/gdbudp.c
@@ -0,0 +1,257 @@
+/*
+ * Copyright (C) 2008 Stefan Hajnoczi <stefanha@gmail.com>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <byteswap.h>
+#include <gpxe/iobuf.h>
+#include <gpxe/in.h>
+#include <gpxe/if_arp.h>
+#include <gpxe/if_ether.h>
+#include <gpxe/ip.h>
+#include <gpxe/udp.h>
+#include <gpxe/netdevice.h>
+#include <gpxe/nap.h>
+#include <gpxe/gdbstub.h>
+#include <gpxe/gdbudp.h>
+
+/** @file
+ *
+ * GDB over UDP transport
+ *
+ */
+
+enum {
+	DEFAULT_PORT = 43770, /* UDP listen port */
+};
+
+struct gdb_transport udp_gdb_transport __gdb_transport;
+
+static struct net_device *netdev;
+static uint8_t dest_eth[ETH_ALEN];
+static struct sockaddr_in dest_addr;
+static struct sockaddr_in source_addr;
+
+static void gdbudp_ensure_netdev_open ( struct net_device *netdev ) {
+	/* The device may have been closed between breakpoints */
+	assert ( netdev );
+	netdev_open ( netdev );
+
+	/* Strictly speaking, we may need to close the device when leaving the interrupt handler */
+}
+
+static size_t gdbudp_recv ( char *buf, size_t len ) {
+	struct io_buffer *iob;
+	struct ethhdr *ethhdr;
+	struct arphdr *arphdr;
+	struct iphdr *iphdr;
+	struct udp_header *udphdr;
+	size_t payload_len;
+
+	gdbudp_ensure_netdev_open ( netdev );
+
+	for ( ; ; ) {
+		netdev_poll ( netdev );
+		while ( ( iob = netdev_rx_dequeue ( netdev ) ) != NULL ) {
+			/* Ethernet header */
+			if ( iob_len ( iob ) < sizeof ( *ethhdr ) ) {
+				goto bad_packet;
+			}
+			ethhdr = iob->data;
+			iob_pull ( iob, sizeof ( *ethhdr ) );
+
+			/* Handle ARP requests so the client can find our MAC */
+			if ( ethhdr->h_protocol == htons ( ETH_P_ARP ) ) {
+				arphdr = iob->data;
+				if ( iob_len ( iob ) < sizeof ( *arphdr ) + 2 * ( ETH_ALEN + sizeof ( struct in_addr ) ) ||
+						arphdr->ar_hrd != htons ( ARPHRD_ETHER ) ||
+						arphdr->ar_pro != htons ( ETH_P_IP ) ||
+						arphdr->ar_hln != ETH_ALEN ||
+						arphdr->ar_pln != sizeof ( struct in_addr ) ||
+						arphdr->ar_op != htons ( ARPOP_REQUEST ) ||
+						* ( uint32_t * ) arp_target_pa ( arphdr ) != source_addr.sin_addr.s_addr ) {
+					goto bad_packet;
+				}
+
+				/* Generate an ARP reply */
+				arphdr->ar_op = htons ( ARPOP_REPLY );
+				memswap ( arp_sender_pa ( arphdr ), arp_target_pa ( arphdr ), sizeof ( struct in_addr ) );
+				memcpy ( arp_target_ha ( arphdr ), arp_sender_ha ( arphdr ), ETH_ALEN );
+				memcpy ( arp_sender_ha ( arphdr ), netdev->ll_addr, ETH_ALEN );
+
+				/* Fix up ethernet header */
+				ethhdr = iob_push ( iob, sizeof ( *ethhdr ) );
+				memcpy ( ethhdr->h_dest, ethhdr->h_source, ETH_ALEN );
+				memcpy ( ethhdr->h_source, netdev->ll_addr, ETH_ALEN );
+
+				netdev_tx ( netdev, iob );
+				continue; /* no need to free iob */
+			}
+
+			if ( ethhdr->h_protocol != htons ( ETH_P_IP ) ) {
+				goto bad_packet;
+			}
+
+			/* IP header */
+			if ( iob_len ( iob ) < sizeof ( *iphdr ) ) {
+				goto bad_packet;
+			}
+			iphdr = iob->data;
+			iob_pull ( iob, sizeof ( *iphdr ) );
+			if ( iphdr->protocol != IP_UDP || iphdr->dest.s_addr != source_addr.sin_addr.s_addr ) {
+				goto bad_packet;
+			}
+
+			/* UDP header */
+			if ( iob_len ( iob ) < sizeof ( *udphdr ) ) {
+				goto bad_packet;
+			}
+			udphdr = iob->data;
+			if ( udphdr->dest != source_addr.sin_port ) {
+				goto bad_packet;
+			}
+
+			/* Learn the remote connection details */
+			memcpy ( dest_eth, ethhdr->h_source, ETH_ALEN );
+			dest_addr.sin_addr.s_addr = iphdr->src.s_addr;
+			dest_addr.sin_port = udphdr->src;
+
+			/* Payload */
+			payload_len = ntohs ( udphdr->len );
+			if ( payload_len < sizeof ( *udphdr ) || payload_len > iob_len ( iob ) ) {
+				goto bad_packet;
+			}
+			payload_len -= sizeof ( *udphdr );
+			iob_pull ( iob, sizeof ( *udphdr ) );
+			if ( payload_len > len ) {
+				goto bad_packet;
+			}
+			memcpy ( buf, iob->data, payload_len );
+
+			free_iob ( iob );
+			return payload_len;
+
+bad_packet:
+			free_iob ( iob );
+		}
+		cpu_nap();
+	}
+}
+
+static void gdbudp_send ( const char *buf, size_t len ) {
+	struct io_buffer *iob;
+	struct ethhdr *ethhdr;
+	struct iphdr *iphdr;
+	struct udp_header *udphdr;
+
+	/* Check that we are connected */
+	if ( dest_addr.sin_port == 0 ) {
+		return;
+	}
+
+	gdbudp_ensure_netdev_open ( netdev );
+
+	iob = alloc_iob ( sizeof ( *ethhdr ) + sizeof ( *iphdr ) + sizeof ( *udphdr ) + len );
+	if ( !iob ) {
+		return;
+	}
+
+	/* Payload */
+	iob_reserve ( iob, sizeof ( *ethhdr ) + sizeof ( *iphdr ) + sizeof ( *udphdr ) );
+	memcpy ( iob_put ( iob, len ), buf, len );
+
+	/* UDP header */
+	udphdr = iob_push ( iob, sizeof ( *udphdr ) );
+	udphdr->src = source_addr.sin_port;
+	udphdr->dest = dest_addr.sin_port;
+	udphdr->len = htons ( iob_len ( iob ) );
+	udphdr->chksum = 0; /* optional and we are not using it */
+
+	/* IP header */
+	iphdr = iob_push ( iob, sizeof ( *iphdr ) );
+	memset ( iphdr, 0, sizeof ( *iphdr ) );
+	iphdr->verhdrlen = ( IP_VER | ( sizeof ( *iphdr ) / 4 ) );
+	iphdr->service = IP_TOS;
+	iphdr->len = htons ( iob_len ( iob ) );	
+	iphdr->ttl = IP_TTL;
+	iphdr->protocol = IP_UDP;
+	iphdr->dest.s_addr = dest_addr.sin_addr.s_addr;
+	iphdr->src.s_addr = source_addr.sin_addr.s_addr;
+	iphdr->chksum = tcpip_chksum ( iphdr, sizeof ( *iphdr ) );
+
+	/* Ethernet header */
+	ethhdr = iob_push ( iob, sizeof ( *ethhdr ) );
+	memcpy ( ethhdr->h_dest, dest_eth, ETH_ALEN );
+	memcpy ( ethhdr->h_source, netdev->ll_addr, ETH_ALEN );
+	ethhdr->h_protocol = htons ( ETH_P_IP );
+
+	netdev_tx ( netdev, iob );
+}
+
+struct gdb_transport *gdbudp_configure ( const char *name, struct sockaddr_in *addr ) {
+	struct settings *settings;
+
+	/* Release old network device */
+	netdev_put ( netdev );
+
+	netdev = find_netdev ( name );
+	if ( !netdev ) {
+		return NULL;
+	}
+
+	/* Hold network device */
+	netdev_get ( netdev );
+
+	/* Source UDP port */
+	source_addr.sin_port = ( addr && addr->sin_port ) ? addr->sin_port : htons ( DEFAULT_PORT );
+
+	/* Source IP address */
+	if ( addr && addr->sin_addr.s_addr ) {
+		source_addr.sin_addr.s_addr = addr->sin_addr.s_addr;
+	} else {
+		settings = netdev_settings ( netdev );
+		fetch_ipv4_setting ( settings, &ip_setting, &source_addr.sin_addr );
+		if ( source_addr.sin_addr.s_addr == 0 ) {
+			netdev_put ( netdev );
+			netdev = NULL;
+			return NULL;
+		}
+	}
+
+	return &udp_gdb_transport;
+}
+
+static int gdbudp_init ( int argc, char **argv ) {
+	if ( argc != 1 ) {
+		printf ( "udp: missing <interface> argument\n" );
+		return 1;
+	}
+
+	if ( !gdbudp_configure ( argv[0], NULL ) ) {
+		printf ( "%s: device does not exist or has no IP address\n", argv[0] );
+		return 1;
+	}
+	return 0;
+}
+
+struct gdb_transport udp_gdb_transport __gdb_transport = {
+	.name = "udp",
+	.init = gdbudp_init,
+	.send = gdbudp_send,
+	.recv = gdbudp_recv,
+};