sisniff
Aus Si:Wiki von Siegrist SystemLösungen - Informatik und Rezepte
Version vom 30. Oktober 2023, 16:20 Uhr von Sigi (Diskussion | Beiträge)
Ein Netzwerk-Sniffer der für jedes Packet nebst Adresse und Port die lokal verbundene Anwendung und deren PID ermittelt und anzeigt.
sisniff versucht, zu jedem Packet der Netzwerkschnittstelle die dazugehörigen Anwendung zu ermitteln.
Sinnvoll vor allem in einer Desktop Umgebung
Es wird TCP, UDP und ICMP unterstützt, für IPv4 und IPv6.
Der Sniffer akzeptiert Filter wie sie bei tcpdump üblich sind.
Bei HTTP Verbindungen kann ausserdem ein Teil der Payload angezeigt werden.
Die Option -h gibt eine Argumenteübersicht und listet die verfügbaren Interfaces auf.
# ./sisniff -h
usage: sisniff [-h] -i {eth0,lo,wlan0} [-n] [-P] [-p program|not-program] [-4] [-6] [-H] [-Hl] [filter]
sisniff V1.5
2017-2023 by sigi <https://wiki.zweiernet.ch/wiki/sisniff>
positional arguments:
filter Filter (BPF syntax) on top of IP (in dbl-quotes "...")
optional arguments:
-h, --help show this help message and exit
-i {eth0,lo,wlan0} Interface
-n Do not resolve IP-Addresses
-P Don't put interface into promiscuous mode
-p program|not-program
Filter by program name (accepts * pattern) ([not-] negates)
-4 Only IPv4
-6 Only IPv6
-H Show HTTP Payload
-Hl Show HTTP Payload, long output
- Downloads der aktuellen Version
- Download mit wget:
wget https://git.zweiernet.ch/sigi/sisniff/raw/master/sisniff - gzipped: https://git.zweiernet.ch/sigi/sisniff/archive/master.tar.gz
- Git Projektseite: https://git.zweiernet.ch/sigi/sisniff
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Beispiele:
# sisniff "port not ssh" # sisniff -p *vpn* # sisniff -i wlan0 -p not-thunderbird-bin -4 "host not www.zweiernet.ch" # sisniff -i eth0 -p firefox -Hl "port 80"
Python Code:
#!/usr/bin/env python3 # (c) 2017-2022 by Siegrist(SystemLoesungen) <PSS@ZweierNet.ch> # # All Rights reserved. # 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. # # 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. # from scapy.all import * import pwd import os import re import glob import sys import string import fcntl import struct import argparse #if sys.version_info.major == 2: # import commands as subprocess #elif sys.version_info.major == 3: # import subprocess def _to_str(inp): if sys.version_info.major == 2: return inp else: return "".join( chr(x) for x in inp) VERSION = "1.4" PROC_TCP4 = "/proc/net/tcp" PROC_UDP4 = "/proc/net/udp" PROC_ICMP4 = "/proc/net/icmp" PROC_TCP6 = "/proc/net/tcp6" PROC_UDP6 = "/proc/net/udp6" PROC_PACKET = "/proc/net/packet" # Services TSERV = dict((TCP_SERVICES[k], k) for k in TCP_SERVICES.keys()) USERV = dict((UDP_SERVICES[k], k) for k in UDP_SERVICES.keys()) # IP Protocol Numbers (dec) IPPROTO_ICMP = 1 IPPROTO_TCP = 6 IPROTOP_IGP = 9 IPPROTO_UDP = 17 nostate = set(['04','05','06''07','08','09','0C','0D']) tcp_payload_hdrs = ['GET|POST|HTTP|HEAD|PUT|PATCH|DELETE|TRACE|OPTIONS|CONNECT'] numeric = False payloadH = False payloadHl = False fillter = "" def get_conn_info(proto,hosts,ports,ipvers): ''' returns: pid, exe, uid ''' uid = 0 line_array = _proc4load(proto,hosts,ports,ipvers) if line_array == 0: return ['?','?','?'] ''' try: uid = pwd.getpwuid(int(line_array[7]))[0] # Get user from UID. except: uid = line_array[7] ''' inode = str(line_array[9]) if inode == "0": return ['.','.','.'] pid = _get_pid_of_inode(inode) # try get a pid if pid == "NoPid": #print(">>>>>>>>>>>NoPID:" + str(hosts) +" "+ str(ports) + "//" + str(line_array)) return ['-', '-', uid] try: # try read the process name. exe = os.readlink('/proc/'+pid+'/exe').split('/')[-1] except: exe = None #print(str(lhost) +" "+ str(lport) +" "+ inode +" "+ pid) return [pid, exe, uid] def _proc4load(proto,hosts,ports,ipvers): ''' Read the table of tcp/udp connections tcp/udp: "sl, local_address, rem_address, st, tx_queue rx_queue, tr tm->when, retrnsmt, uid , timeout, inode ,..." ---- TCP states from https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/net/tcp_states.h?id=HEAD enum { TCP_ESTABLISHED = 1, TCP_SYN_SENT, TCP_SYN_RECV, TCP_FIN_WAIT1, TCP_FIN_WAIT2, TCP_TIME_WAIT, TCP_CLOSE, TCP_CLOSE_WAIT, TCP_LAST_ACK, TCP_LISTEN, TCP_CLOSING, /* Now a valid state */ TCP_NEW_SYN_RECV, TCP_MAX_STATES /* Leave at the end! */ }; ---------- ''' #xhosts = _ip_hexrev(hosts) xports = _dec2hex(ports) if proto == IPPROTO_UDP: try: procv = PROC_UDP4 if ipvers == 6: procv = PROC_UDP6 with open(procv,'r') as f: next(f) for line in f: line_arrayu = _remove_empty(line.split(' ')) l_xhost,l_xport = line_arrayu[1].split(':') if l_xhost not in xMYADDRS: continue if l_xport == xports: return line_arrayu return 0 except: print("open proc_udp4 error") return 0 elif proto == IPPROTO_TCP: try: procv = PROC_TCP4 if ipvers == 6: procv = PROC_TCP6 with open(procv,'r') as f: next(f) for line in f: line_arrayt = _remove_empty(line.split(' ')) if line_arrayt[3] in nostate: # not some TCP state continue l_xhost,l_xport = line_arrayt[1].split(':') if l_xhost not in xMYADDRS: continue if l_xport == xports: return line_arrayt return 0 except: print("open proc_tcp error") return 0 elif proto == IPPROTO_ICMP: try: procv = PROC_ICMP4 if ipvers == 6: procv = PROC_ICMP6 with open(procv,'r') as f: next(f) for line in f: line_arrayi = _remove_empty(line.split(' ')) l_xhost,l_xport = line_arrayi[1].split(':') if l_xhost not in xMYADDRS: continue if l_xport == xports: return line_arrayi return 0 except: print("open proc_icmp4 error") return 0 return 0 def _convert_ipv4_port(array): host,port = array.split(':') return _ip(host),_hex2dec(port) def _hex2dec(s): return str(int(s,16)) def _dec2hex(p): return hex(int(p)).split('x')[-1].upper() def _ip(s): ip = [(_hex2dec(s[6:8])),(_hex2dec(s[4:6])),(_hex2dec(s[2:4])),(_hex2dec(s[0:2]))] return '.'.join(ip) def _ip6(s): ip = [s[6:8],s[4:6],s[2:4],s[0:2],s[14:16],s[12:14],s[10:12],s[8:10],s[22:24],s[20:22],s[18:20],s[16:18],s[30:32],s[28:30],s[26:28],s[24:26]] return ':'.join(ip) def _ip_hexrev(ip): return ''.join([hex(int(x)+256)[3:] for x in ip.split('.')][::-1]).upper() # IPv6 /proc/net/tcp6 format from expanded ip-address def _to_v6_proc(s): s = s.replace(":", "") ip = [s[6:8],s[4:6],s[2:4],s[0:2],s[14:16],s[12:14],s[10:12],s[8:10],s[22:24],s[20:22],s[18:20],s[16:18],s[30:32],s[28:30],s[26:28],s[24:26]] return ''.join(ip).upper() def expand_v6(ip): ipa = ip.split(':') # liste if '' in ipa: if ipa.count('') > 1: # korr ::1 or ::: for i in range(ipa.count('')-1): ipa.remove('') miss = 8 - len(ipa) +1 for i in range(miss): ipa.insert(ipa.index('')+i, '0000') ipa.remove('') return ':'.join(["%04x" % x for x in [int(x, 16) for x in ipa]]) else: return ':'.join(["%04x" % x for x in [int(x, 16) for x in ipa]]) def _remove_empty(array): return [x for x in array if x != ''] def _get_pid_of_inode(inode): s_term = r'^socket\:\['+ inode +r'\]$' for item in glob.iglob('/proc/[0-9]*/fd/[0-9]*'): try: if re.match(s_term,os.readlink(item)): return item.split('/')[2] except: pass return "NoPid" def _resolve_ip(host): """ resolve ip und update dictionary res_cache {'ip': 'name'}. If resolution for a ip failed, 'name' is n_try ... 0. """ try: hname = socket.gethostbyaddr(host)[0] res_cache[host] = str(hname) return str(hname) except: res_cache[host] = str(host) return str(host) def check_root(): if os.getuid() == 0: return True else: return False ## Define our Custom Action function def doPackets(packet): program = "-" pid = "-" uid = "-" o_proto = "" o_dport = "none" o_sport = "none" flags = "" # only local addresses if packet[0][1].src in MYADDRS: conn_addr = packet[0][1].src if packet.haslayer(TCP) or packet.haslayer(UDP) or packet.haslayer(ICMP): try: conn_port = packet[0][2].sport except: conn_port = 99999 o_dir = 1 else: conn_addr = packet[0][1].dst if packet.haslayer(TCP) or packet.haslayer(UDP) or packet.haslayer(ICMP): try: conn_port = packet[0][2].dport except: conn_port = 99999 o_dir = 0 if packet.haslayer(TCP) or packet.haslayer(UDP) or packet.haslayer(ICMP): # grrr, no info in /proc/net/icmp so far. or packet.haslayer(ICMP): # logemol casch c_hash = conn_addr+'=:='+str(conn_port) if not any(x[0] == c_hash for x in conn_cache): # get the connection info from packet if packet[0][1].version == 4: spid,sexe,suid = get_conn_info(packet[0][1].proto, conn_addr, conn_port, packet[0][1].version) elif packet[0][1].version == 6: spid,sexe,suid = get_conn_info(packet[0][1].nh, conn_addr, conn_port, packet[0][1].version) if re.match("[0-9]+$", spid): program = sexe pid = spid uid = suid # update cache if len(conn_cache) >= cc_maxlen: conn_cache.pop(0) conn_cache.append([c_hash,program,pid]) else: program = sexe pid = spid uid = suid else: # me honds fom casch indx = [x[0] for x in conn_cache].index(c_hash) program = conn_cache[indx][1] pid = conn_cache[indx][2] uid = 0 # cache aktualisieren renew = conn_cache.pop(indx) conn_cache.append(renew) try: filter_prog except: pass else: if filter_prog.startswith('not-'): filter_progn = filter_prog[4:] if filter_progn.startswith('*') and filter_progn.endswith('*') and re.search(filter_progn[1:-1], program): return elif filter_progn.startswith('*') and not filter_progn.endswith('*') and re.search(filter_progn[1:]+'$', program): return elif not filter_progn.startswith('*') and filter_progn.endswith('*') and re.match('^'+filter_progn[:-1], program): return elif not filter_progn.startswith('*') and not filter_progn.endswith('*') and re.match('^'+filter_progn+'$', program): return else: if filter_prog.startswith('*') and filter_prog.endswith('*') and not re.search(filter_prog[1:-1], program): return elif filter_prog.startswith('*') and not filter_prog.endswith('*') and not re.search(filter_prog[1:]+'$', program): return elif not filter_prog.startswith('*') and filter_prog.endswith('*') and not re.match('^'+filter_prog[:-1], program): return elif not filter_prog.startswith('*') and not filter_prog.endswith('*') and not re.match('^'+filter_prog+'$', program): return o_payload = "" if packet.haslayer(UDP): o_proto = "UDP" try: o_dport = "\033[1m"+USERV[packet[0][2].dport]+"\033[0m" except: o_dport = str(packet[0][2].dport) try: o_sport = "\033[1m"+USERV[packet[0][2].sport]+"\033[0m" except: o_sport = str(packet[0][2].sport) flags = "" #o_payload = _to_str(packet[0].sprintf('%10s,UDP.payload%')) elif packet.haslayer(TCP): o_proto = "TCP" try: o_dport = "\033[1m"+TSERV[packet[0][2].dport]+"\033[0m" except: o_dport = str(packet[0][2].dport) try: o_sport = "\033[1m"+TSERV[packet[0][2].sport]+"\033[0m" except: o_sport = str(packet[0][2].sport) flags = packet[0].sprintf('%3s,TCP.flags%') if payloadH == True: if packet.haslayer(Raw): #tpld = packet[0].sprintf('%TCP.payload%') tpld = _to_str(packet[0][TCP].load) tpldhead = tpld[0:8] #print("tpld:" + tpldhead) if re.match(r'GET|POST|HTTP|HEAD|PUT|PATCH|DELETE|TRACE|OPTIONS|CONNECT.*', tpldhead): if payloadHl == True: o_payload = str(tpld) else: request_line, gaga = tpld.split('\r\n', 1) o_payload = str(request_line) #o_payload = tpld[0:20] elif packet.haslayer(ICMP): o_proto = "ICMP" if conn_port == 99999: o_dport = "-" o_sport = "-" else: try: o_dport = "\033[1m"+USERV[packet[0][2].sport]+"\033[0m" except: o_dport = str(packet[0][2].sport) try: o_sport = "\033[1m"+USERV[packet[0][2].dport]+"\033[0m" except: o_sport = str(packet[0][2].dport) flags = "["+packet[0].sprintf('%ICMP.type%') + "/" + packet[0].sprintf('%ICMP.code%')+"]" else: layerukn = packet[0][1].getlayer(1) if layerukn is None: o_proto = "UNKNOWN" else: #print("Layer:", xxl1.name) o_proto = layerukn.name #o_proto = "UNKNOWN" if packet[0][1].version == 4: packlen = str(packet[0][1].len) if packet[0][1].version == 6: packlen = str(packet[0][1].plen) if o_dir == 1: if numeric == False: #if res_cache.has_key(packet[0][1].dst): if packet[0][1].dst in res_cache: rem_name = res_cache[packet[0][1].dst] else: rem_name = _resolve_ip(packet[0][1].dst) else: rem_name = packet[0][1].dst #return "\033[1m "+str(packet[0].time)+" "+str(program)+"\033[0m" +"/"+ str(pid) + " - " + o_proto + ": " + packet[0][1].src + ":" + o_sport + "\033[1m\033[31m ->>> \033[0m" + rem_name + ":" + o_dport + " " + flags + " Len:" + str(packet[0][1].len) + " : " + o_payload return "\033[1m"+str(program)+"\033[0m" +"/"+ str(pid) + " - " + o_proto + ": " + packet[0][1].src + ":" + o_sport + "\033[1m\033[31m ->>> \033[0m" + rem_name + ":" + o_dport + " " + flags + " Len:" + packlen + " : " + o_payload else: if numeric == False: #if res_cache.has_key(packet[0][1].src): if packet[0][1].src in res_cache: rem_name = res_cache[packet[0][1].src] else: rem_name = _resolve_ip(packet[0][1].src) else: rem_name = packet[0][1].src return "\033[1m"+str(program)+"\033[0m" +"/"+ str(pid) + " - " + o_proto + ": " + packet[0][1].dst + ":" + o_dport + "\033[1m\033[36m <<<- \033[0m" + rem_name + ":" + o_sport + " " + flags + " Len:" + packlen + " : " + o_payload ## -- Ond denn s'Hooptprogramm # root check if not check_root(): print("This program needs root privileges !\nThats because of reading the /proc filesystem and using libpcap functions.\nSo I give up\n") conf.sniff_promisc=0 conf.sniff_promisc=0 sys.exit() # get the interfaces #ifaces = subprocess.getoutput("ls /sys/class/net") #iface_list = ifaces.split('\n') iface_list = get_if_list() iface = conf.route.route("0.0.0.0")[0] rfilter = "ip or ip6" print("") # commandline params parser = argparse.ArgumentParser(description='sisniff V'+VERSION+"\n2017-2022 by sigi <https://wiki.zweiernet.ch/wiki/sisniff>", formatter_class=argparse.RawDescriptionHelpFormatter) parser.add_argument('-i', help="Interface", choices=iface_list) parser.add_argument('-n', help="Do not resolve IP-Addresses", action="store_true") parser.add_argument('-p', help='Filter by program name (accepts * for matching) ([not-] negates)', type=str, metavar='program|not-program') parser.add_argument('-4', dest='v4', help="Only IPv4", action="store_true") parser.add_argument('-6', dest='v6', help="Only IPv6", action="store_true") parser.add_argument('-H', help="Show HTTP Payload", action="store_true") parser.add_argument('-Hl', help="Show HTTP Payload, long output", action="store_true") parser.add_argument('filter', nargs='?', help="Filter (BPF syntax) on top of IP (in dbl-quotes \"...\")", type=str) args = parser.parse_args() if args.i: iface = args.i if args.n: numeric = True if args.v4: rfilter = "ip" if args.v6: rfilter = "ip6" if args.H: payloadH = True if args.Hl: payloadH = True payloadHl = True if args.filter: fillter = " and (" + args.filter + ")" print("\033[1m> Applying Filter: \"" + rfilter + fillter + "\"\033[0m") if args.p: filter_prog = args.p # local addresses if args.v6: MYADDRS=[] xMYADDRS = [] else: MYADDRS = _remove_empty(os.popen("ip addr show " + iface + " | egrep 'inet ' | awk '{{print $2}}' | awk -F'/' '{{print $1}}'").read().split()) MYADDRS.append('0.0.0.0') MYADDRS.append('127.0.0.1') xMYADDRS = [_ip_hexrev(x) for x in MYADDRS] if args.v4: MYADDRS6=[] else: MYADDRS6 = _remove_empty(os.popen("ip addr show " + iface + " | egrep 'inet6' | grep -vi fe80 | awk '{{print $2}}' | awk -F'/' '{{print $1}}'").read().split()) MYADDRS6.append(':::') MYADDRS6.append('::1') MYADDRS = MYADDRS + MYADDRS6 xMYADDRS = xMYADDRS + [_to_v6_proc(expand_v6(x)) for x in MYADDRS6] print("> My IP-Addresses: " + str(MYADDRS)) print("> Listening on: " + iface) # confirmed connections cache (ringboffer) conn_cache = [] cc_maxlen = 20 # resolver cache res_cache = {} n_try = 3 print("") print("Prog/PID mavericks: \033[1m?/?\033[0m = No entry in /proc/net/xxx; \033[1m-/-\033[0m = No PID for Inode found; \033[1m./.\033[0m = Inode=0;") print("") print("Program/PID: Local addr:port <<->> Remote addr:port [Flags] Len:length : [Payload]") print("----------------------------------------------------------------------------------") # sniff, filtering for IP traffic try: sniff(filter=rfilter+fillter,iface=iface,prn=doPackets, store=0) except Exception as e: print("\n \033[1mError: " + str(e) + "\033[0m \n") ## -- oond denn isch schloss
