def __str__(self):
if (self.nxt == 6 or self.nxt == 17 or self.nxt == 58) and not self.data.sum:
# XXX - set TCP, UDP, and ICMPv6 checksums
p = str(self.data)
s = dpkt.in_cksum_add(0, self.src + self.dst)
s = dpkt.in_cksum_add(s, p)
try:
self.data.sum = dpkt.in_cksum_done(s + self.nxt + len(p))
except AttributeError:
pass
return dpkt.Packet.__str__(self)
def __str__(self):
if (self.nxt == 6 or self.nxt == 17 or self.nxt == 58) and not self.data.sum:
# XXX - set TCP, UDP, and ICMPv6 checksums
p = str(self.data)
s = dpkt.struct.pack('>16s16sxBH', self.src, self.dst, self.nxt, len(p))
s = dpkt.in_cksum_add(0, s)
s = dpkt.in_cksum_add(s, p)
try:
self.data.sum = dpkt.in_cksum_done(s)
except AttributeError:
pass
return self.pack_hdr() + self.headers_str() + str(self.data)
def __verify_checksums(cls, ippacket):
if dpkt.in_cksum(ippacket.pack_hdr() + str(ippacket.opts)) != 0:
return False
if (ippacket.off & (dpkt.ip.IP_MF | dpkt.ip.IP_OFFMASK)) != 0:
return True
p = str(ippacket.data)
s = dpkt.struct.pack('>4s4sxBH', ippacket.src, ippacket.dst,
ippacket.p, len(p))
s = dpkt.in_cksum_add(0, s)
s = dpkt.in_cksum_add(s, p)
return dpkt.in_cksum_done(s) == 0
def __str__(self):
if self.sum == 0:
self.sum = dpkt.in_cksum(self.pack_hdr() + str(self.opts))
if (self.p == 6 or self.p == 17) and (self.off & (IP_MF | IP_OFFMASK)) == 0 and \
isinstance(self.data, dpkt.Packet) and self.data.sum == 0:
# Set zeroed TCP and UDP checksums for non-fragments.
p = str(self.data)
s = dpkt.struct.pack('>4s4sxBH', self.src, self.dst,
self.p, len(p))
s = dpkt.in_cksum_add(0, s)
s = dpkt.in_cksum_add(s, p)
self.data.sum = dpkt.in_cksum_done(s)
if self.p == 17 and self.data.sum == 0:
self.data.sum = 0xffff # RFC 768
# XXX - skip transports which don't need the pseudoheader
return self.pack_hdr() + str(self.opts) + str(self.data)
