def send_ping_from_node(self, node_name, intf_name, dst_ip):
"""Sends a ping from the request node's specified interface. If the
node or port is invalid, TIBadNodeOrPort is raised."""
_, intf = self.get_node_and_intf_with_link(node_name, intf_name)
mac_dst = intf.link.get_other(intf).mac
mac_src = intf.mac
mac_type = '\x08\x00'
ethernet_hdr = mac_dst + mac_src + mac_type
src_ip = intf.ip
ip_hdr = Packet.cksum_ip_hdr('\x45\x00\x00\x54\x00\x00\x40\x00\x40\x01\x00\x00' + src_ip + dst_ip)
# 56 bytes of data needed since IP tlen field set to expect a 64B payload (8B ICMP hdr + 56B data)
icmp_data = 'This echo request sent through VNS for a topo interactor'
icmp = Packet.cksum_icmp_pkt('\x08\x00\x00\x00\x00\x00\x00\x01' + icmp_data)
ethernet_frame = ethernet_hdr + ip_hdr + icmp
intf.link.send_to_other(intf, ethernet_frame)
def send_ping_from_node(self, node_name, intf_name, dst_ip):
"""Sends a ping from the request node's specified interface. If the
node or port is invalid, TIBadNodeOrPort is raised."""
_, intf = self.get_node_and_intf_with_link(node_name, intf_name)
mac_dst = intf.link.get_other(intf).mac
mac_src = intf.mac
mac_type = '\x08\x00'
ethernet_hdr = mac_dst + mac_src + mac_type
src_ip = intf.ip
ip_hdr = Packet.cksum_ip_hdr('\x45\x00\x00\x54\x00\x00\x40\x00\x40\x01\x00\x00' + src_ip + dst_ip)
# 56 bytes of data needed since IP tlen field set to expect a 64B payload (8B ICMP hdr + 56B data)
icmp_data = 'This echo request sent through VNS for a topo interactor'
icmp = Packet.cksum_icmp_pkt('\x08\x00\x00\x00\x00\x00\x00\x01' + icmp_data)
ethernet_frame = ethernet_hdr + ip_hdr + icmp
intf.link.send_to_other(intf, ethernet_frame)
def handle_packet_from_outside(data):
logging.debug('--------------------------------------------------')
logging.debug('--------------------------------------------------')
logging.debug('got packet: %s' % pktstr(data))
pkt = Packet(data)
if pkt.is_tcp() and pkt.is_valid_tcp():
logging.debug('passing on tcp packet ...')
tcp_conn = server.handle_tcp(pkt)
if tcp_conn:
tcp_pts = tcp_conn.get_packets_to_send()
if tcp_pts:
for tcp, data in tcp_pts:
eth = pkt.get_reversed_eth()
ip = pkt.get_reversed_ip(new_ttl=64,
new_tlen=pkt.ip_hlen +
len(tcp) + len(data))
p = eth + ip + Packet.cksum_tcp_hdr(ip, tcp,
data) + data
logging.debug('sending packet: %s' % pktstr(p))
try:
raw_socket.send(p)
except socket.error:
logging.exception('failed to send packet')
sys.exit(-1)
else:
logging.debug('no packets to send back')
def send_packets(self):
"""Send any waiting packets"""
if self.intf and self.pkt:
for (_, tcp_conn) in self.http_server.connections.iteritems():
if tcp_conn and not tcp_conn.dead:
tcp_pts = tcp_conn.get_packets_to_send()
for tcp, data in tcp_pts:
eth = self.pkt.get_reversed_eth()
ip = self.pkt.get_reversed_ip(new_ttl=64, new_tlen=self.pkt.ip_hlen+len(tcp)+len(data))
pkt_out = eth + ip + Packet.cksum_tcp_hdr(ip, tcp, data) + data
logging.debug('%s sending packet from HTTP server: %s' % (self, pktstr(pkt_out)))
self.intf.link.send_to_other(self.intf, pkt_out)
def handle_http_request(self, intf, pkt):
"""Forward the received packet from an HTTP client to the web server."""
tcp_conn = self.http_server.handle_tcp(pkt)
if tcp_conn:
tcp_pts = tcp_conn.get_packets_to_send()
if tcp_pts:
for tcp, data in tcp_pts:
eth = pkt.get_reversed_eth()
ip = pkt.get_reversed_ip(new_ttl=64, new_tlen=pkt.ip_hlen+len(tcp)+len(data))
pkt_out = eth + ip + Packet.cksum_tcp_hdr(ip, tcp, data) + data
logging.debug('%s sending packet from HTTP server: %s' % (self, pktstr(pkt_out)))
intf.link.send_to_other(intf, pkt_out)
def handle_packet_from_outside(data):
logging.debug('--------------------------------------------------')
logging.debug('--------------------------------------------------')
logging.debug('got packet: %s' % pktstr(data))
pkt = Packet(data)
if pkt.is_tcp() and pkt.is_valid_tcp():
logging.debug('passing on tcp packet ...')
tcp_conn = server.handle_tcp(pkt)
if tcp_conn:
tcp_pts = tcp_conn.get_packets_to_send()
if tcp_pts:
for tcp, data in tcp_pts:
eth = pkt.get_reversed_eth()
ip = pkt.get_reversed_ip(new_ttl=64, new_tlen=pkt.ip_hlen+len(tcp)+len(data))
p = eth + ip + Packet.cksum_tcp_hdr(ip, tcp, data) + data
logging.debug('sending packet: %s' % pktstr(p))
try:
raw_socket.send(p)
except socket.error:
logging.exception('failed to send packet')
sys.exit(-1)
else:
logging.debug('no packets to send back')
