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fix: use ip addr on linux to find out MAC and IPv6 address

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uhi22 2023-03-22 08:44:07 +01:00
parent 0980ced46b
commit 97ec82cef5
2 changed files with 89 additions and 43 deletions
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123
addressManager.py
View file

@ -6,6 +6,7 @@
# #
import subprocess import subprocess
import os import os
import sys
from helpers import * # prettyMac etc from helpers import * # prettyMac etc
MAC_LAPTOP = [0xdc, 0x0e, 0xa1, 0x11, 0x67, 0x08 ] # Win10 laptop MAC_LAPTOP = [0xdc, 0x0e, 0xa1, 0x11, 0x67, 0x08 ] # Win10 laptop
@ -34,6 +35,12 @@ class addressManager():
# On windows we can use command line tool "ipconfig". # On windows we can use command line tool "ipconfig".
# The link-local addresses always start with fe80::, so we just parse the output of ipconfig line-by-line. # The link-local addresses always start with fe80::, so we just parse the output of ipconfig line-by-line.
# If we have multiple interfaces (e.g. ethernet and WLAN), it will find multiple link-local-addresses. # If we have multiple interfaces (e.g. ethernet and WLAN), it will find multiple link-local-addresses.
#
# On Linux, we use "ip addr". From its output we can directly see the ethernet IPv6 and MAC, even if
# there are multiple other interfaces (e.g. WLAN). Pitfall: As long as there is nothing connected to the
# ethernet, the Raspberry will not tell a link-local IPv6 in the command "ip addr". This means, we must
# make sure that the modem is connected and powered, when the script is starting.
ba = bytearray(6)
foundAddresses = [] foundAddresses = []
if os.name == 'nt': if os.name == 'nt':
# on Windows # on Windows
@ -49,20 +56,77 @@ class addressManager():
foundAddresses.append(line[k+1:]) foundAddresses.append(line[k+1:])
else: else:
# on Raspberry # on Raspberry
result = subprocess.run(["ifconfig"], capture_output=True, text=True) cfg_useOldStyleIfconfig = 0
if (len(result.stderr)>0): if (cfg_useOldStyleIfconfig!=0):
print(result.stderr) result = subprocess.run(["ifconfig"], capture_output=True, text=True)
else: if (len(result.stderr)>0):
lines = result.stdout.split("\n") print(result.stderr)
for line in lines: else:
if (line.find("inet6")>0): lines = result.stdout.split("\n")
k = line.find(" fe80::") # the beginning of the IPv6 for line in lines:
if (k>0): if (line.find("inet6")>0):
sIpWithText = line[k+1:] k = line.find(" fe80::") # the beginning of the IPv6
x = sIpWithText.find(" ") # the space is the end of the IPv6 if (k>0):
sIp = sIpWithText[0:x] sIpWithText = line[k+1:]
# print("[addressManager] IP=>" + sIp + "<") x = sIpWithText.find(" ") # the space is the end of the IPv6
foundAddresses.append(sIp) sIp = sIpWithText[0:x]
# print("[addressManager] IP=>" + sIp + "<")
foundAddresses.append(sIp)
else: # instead of the deprecated ifconfig, use "ip addr"
result = subprocess.run(["ip", "addr"], capture_output=True, text=True)
if (len(result.stderr)>0):
print(result.stderr)
else:
blInTheEthernetChapter = 0
lines = result.stdout.split("\n")
for line in lines:
# print(line);
if (line[0:1]!=" "): # if the line does not start with a blank, then it is a heading, e.g.
# 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
# 3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
# print("This is a heading")
if (line.find(": eth")>0):
# print("This is the heading for the ethernet.")
blInTheEthernetChapter = 1 # we are in the ethernet chapter
else:
blInTheEthernetChapter = 0 # we are not in the ethernet chapter
else:
# The line started with a blank. This means, it is no heading.
# In the best case, we find here something like
# inet6 fe80::181f:efdf:97e5:2191/64 scope link
if ((blInTheEthernetChapter==1) and (line.find(" inet6")>0) and (line.find(" scope link")>0)):
k = line.find(" fe80::") # the beginning of the IPv6
if (k>0):
sIpWithText = line[k+1:]
x = sIpWithText.find(" ") # the space is the end of the IPv6
sIp = sIpWithText[0:x]
x = sIp.find("/") # remove the /64 at the end
if (x>0):
sIp = sIp[0:x]
# print("[addressManager] IP=>" + sIp + "<")
foundAddresses.append(sIp)
# Also the ethernet MAC is visible here, something like
# link/ether b8:27:eb:27:33:53 brd ff:ff:ff:ff:ff:ff
if ((blInTheEthernetChapter==1) and (line.find(" link/ether")>0)):
# print(line)
k = line.find("link/ether ")
# print(k)
strMac = line[k+11:k+28]
# e.g. "b8:27:eb:12:34:56"
# print(strMac)
# Remove all ":"
strMac = strMac.replace(":", "")
# print(strMac)
if (len(strMac)!=12):
print("[addressManager] ERROR: invalid length of MAC string. Expected be 6 bytes, means 12 hex characters. Found " + str(len(strMac)))
else:
for i in range(0, 6):
sTwoChar = strMac[2*i : 2*i+2]
ba[i] = int(sTwoChar, 16)
self.localMac = ba
print("[addressManager] we have local MAC " + prettyMac(self.localMac) + ".")
print("[addressManager] Found " + str(len(foundAddresses)) + " link-local IPv6 addresses.") print("[addressManager] Found " + str(len(foundAddresses)) + " link-local IPv6 addresses.")
for a in foundAddresses: for a in foundAddresses:
@ -71,6 +135,10 @@ class addressManager():
if (len(self.localIpv6Addresses)==0): if (len(self.localIpv6Addresses)==0):
print("[addressManager] Error: No local Ipv6 address was found.") print("[addressManager] Error: No local Ipv6 address was found.")
self.localIpv6Address = "localhost" self.localIpv6Address = "localhost"
cfg_exitIfNoLocalLinkAddressIsFound = 1
if (cfg_exitIfNoLocalLinkAddressIsFound!=0):
print("Exiting, because it does not make sense to continue without IPv6 address");
sys.exit(1);
else: else:
# at least one address was found. Take the first one (this may be the wrong adaptor). # at least one address was found. Take the first one (this may be the wrong adaptor).
self.localIpv6Address = self.localIpv6Addresses[0] self.localIpv6Address = self.localIpv6Addresses[0]
@ -89,31 +157,8 @@ class addressManager():
print("[addressManager] we have local MAC " + prettyMac(self.localMac) + ". Todo: find this out dynamically.") print("[addressManager] we have local MAC " + prettyMac(self.localMac) + ". Todo: find this out dynamically.")
else: else:
# on raspberry # on raspberry
# We use "ifconfig", and search for the line which says "ether <mac> ..." # nothing to do here. The MAC address is found together with the IPv6 address above.
result = subprocess.run(["ifconfig"], capture_output=True, text=True) pass
if (len(result.stderr)>0):
print(result.stderr)
else:
lines = result.stdout.split("\n")
for line in lines:
if (line.find(" ether ")>0) and (line.find("(Ethernet)")>0):
# print(line)
k = line.find(" ether ")
# print(k)
strMac = line[k+7:k+24]
# e.g. "b8:27:eb:12:34:56"
# print(strMac)
# Remove all ":"
strMac = strMac.replace(":", "")
#print(strMac)
if (len(strMac)!=12):
print("[addressManager] ERROR: invalid length of MAC string. Expected be 6 bytes, means 12 hex characters. Found " + str(len(strMac)))
else:
for i in range(0, 6):
sTwoChar = strMac[2*i : 2*i+2]
ba[i] = int(sTwoChar, 16)
self.localMac = ba
print("[addressManager] we have local MAC " + prettyMac(self.localMac) + ".")
def setPevMac(self, pevMac): def setPevMac(self, pevMac):
# During the SLAC, the MAC of the PEV was found out. Store it, maybe we need it later. # During the SLAC, the MAC of the PEV was found out. Store it, maybe we need it later.

7
pyPlcWorker.py
View file

@ -23,7 +23,6 @@ class pyPlcWorker():
self.mode = mode self.mode = mode
self.strUserAction = "" self.strUserAction = ""
self.addressManager = addressManager.addressManager() self.addressManager = addressManager.addressManager()
self.addressManager.findLinkLocalIpv6Address()
self.callbackAddToTrace = callbackAddToTrace self.callbackAddToTrace = callbackAddToTrace
self.callbackShowStatus = callbackShowStatus self.callbackShowStatus = callbackShowStatus
self.oldAvlnStatus = 0 self.oldAvlnStatus = 0
@ -44,8 +43,10 @@ class pyPlcWorker():
self.pev = fsmPev.fsmPev(self.addressManager, self.workerAddToTrace, self.hardwareInterface, self.showStatus) self.pev = fsmPev.fsmPev(self.addressManager, self.workerAddToTrace, self.hardwareInterface, self.showStatus)
def __del__(self): def __del__(self):
if (self.mode == C_PEV_MODE): if (self.mode == C_PEV_MODE):
print("worker: deleting pev") try:
del(self.pev) del(self.pev)
except:
pass
def workerAddToTrace(self, s): def workerAddToTrace(self, s):
# The central logging function. All logging messages from the different parts of the project # The central logging function. All logging messages from the different parts of the project