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scapy
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More powerful sprintf format string : %[fmt[r],][cls[:nb].]field% where fmt is a classic one, r can be 

appended for raw substitution (ex: IP.flags=0x18 instead of SA), nb is the number of the layer we want
(ex: for IP/IP packets, IP:2.src is the src of the upper IP layer). Special case : "%.time" is the creation time.
Ex : p.sprintf("%.time% %-15s,IP.src% -> %-15s,IP.dst% %IP.chksum% %03xr,IP.proto% %r,TCP.flags%")
This commit is contained in:
pbi 2003-03-26 16:35:36 +00:00
parent 648d4662aa
commit 1f9f9251f3
1 changed files with 45 additions and 11 deletions
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56
scapy.py
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@ -22,6 +22,12 @@
# #
# $Log: scapy.py,v $ # $Log: scapy.py,v $
# Revision 0.9.7.6 2003/03/26 17:35:36 pbi
# More powerful sprintf format string : %[fmt[r],][cls[:nb].]field% where fmt is a classic one, r can be
# appended for raw substitution (ex: IP.flags=0x18 instead of SA), nb is the number of the layer we want
# (ex: for IP/IP packets, IP:2.src is the src of the upper IP layer). Special case : "%.time" is the creation time.
# Ex : p.sprintf("%.time% %-15s,IP.src% -> %-15s,IP.dst% %IP.chksum% %03xr,IP.proto% %r,TCP.flags%")
#
# Revision 0.9.7.5 2003/03/26 14:47:39 pbi # Revision 0.9.7.5 2003/03/26 14:47:39 pbi
# Added creation time packet. Supported by read/write pcap. # Added creation time packet. Supported by read/write pcap.
# #
@ -39,7 +45,7 @@
from __future__ import generators from __future__ import generators
RCSID="$Id: scapy.py,v 0.9.7.5 2003/03/26 14:47:39 pbi Exp $" RCSID="$Id: scapy.py,v 0.9.7.6 2003/03/26 17:35:36 pbi Exp $"
VERSION = RCSID.split()[2]+"beta" VERSION = RCSID.split()[2]+"beta"
@ -57,6 +63,8 @@ def usage():
# - add a IPtools class (with whois()...) and have IP inherit it) # - add a IPtools class (with whois()...) and have IP inherit it)
# - use i2repr() in sprintf() ? # - use i2repr() in sprintf() ?
# - sprintf support for IP/IP # - sprintf support for IP/IP
# - better self-doc
# - add lsc() to list commands
# #
## ##
##########[XXX]#=-- ##########[XXX]#=--
@ -1249,37 +1257,60 @@ class Packet(Gen):
print "%s%-10s= %s" % (" "*lvl, f.name, f.i2repr(self,self.__getattr__(f))) print "%s%-10s= %s" % (" "*lvl, f.name, f.i2repr(self,self.__getattr__(f)))
self.payload.display(lvl+1) self.payload.display(lvl+1)
def sprintf(self, fmt): def sprintf(self, fmt, relax=1):
s = "" s = ""
while "%" in fmt: while "%" in fmt:
i = fmt.index("%") i = fmt.index("%")
s += fmt[:i] s += fmt[:i]
fmt = fmt[i+1:] fmt = fmt[i+1:]
if fmt[0] == "%": if fmt[0] == "%":
val = "%"
fmt = fmt[1:] fmt = fmt[1:]
s += "%"
continue
else: else:
try: try:
i = fmt.index("%") i = fmt.index("%")
clsfld = fmt[:i] sfclsfld = fmt[:i]
fclsfld = sfclsfld.split(",")
if len(fclsfld) == 1:
f = "s"
clsfld = fclsfld[0]
elif len(fclsfld) == 2:
f,clsfld = fclsfld
else:
raise Exception
cls,fld = clsfld.split(".") cls,fld = clsfld.split(".")
num = 1
if ":" in cls:
cls,num = cls.split(":")
num = int(num)
fmt = fmt[i+1:] fmt = fmt[i+1:]
except: except:
raise Exception("Bad format string [%%%s%s]" % (fmt[:15], fmt[15:] and "...")) raise Exception("Bad format string [%%%s%s]" % (fmt[:25], fmt[25:] and "..."))
else: else:
if fld == "time": if fld == "time":
val = time.strftime("%H:%M:%S.%%06i", time.localtime(self.time)) % int((self.time-int(self.time))*1000000) val = time.strftime("%H:%M:%S.%%06i", time.localtime(self.time)) % int((self.time-int(self.time))*1000000)
elif cls == self.__class__.__name__ and hasattr(self, fld): elif cls == self.__class__.__name__ and hasattr(self, fld):
val = str(getattr(self,fld)) if num > 1:
val = self.payload.sprintf("%%%s,%s:%s.%s%%" % (f,cls,num-1,fld), relax)
f = "s"
elif f[-1] == "r": # Raw field value
val = getattr(self,fld)
f = f[:-1]
if not f:
f = "s"
else:
val = self.fieldtype[fld].i2repr(self,(getattr(self,fld)))
else: else:
val = self.payload.sprintf("%%%s%%" % clsfld) val = self.payload.sprintf("%%%s%%" % sfclsfld, relax)
s += val f = "s"
s += ("%"+f) % val
s += fmt s += fmt
return s return s
#################### ####################
## Packet classes ## ## Packet classes ##
#################### ####################
@ -1318,8 +1349,11 @@ class NoPayload(Packet,object):
return 0 return 0
def display(self, lvl=0): def display(self, lvl=0):
pass pass
def sprintf(self, fmt): def sprintf(self, fmt, relax):
raise Exception("Format not found [%s]"%fmt) if relax:
return "??"
else:
raise Exception("Format not found [%s]"%fmt)