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https://github.com/uhi22/pyPLC.git
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fix: use ip addr on linux to find out MAC and IPv6 address
This commit is contained in:
uhi22
parent
0980ced46b
commit
97ec82cef5
2 changed files with 89 additions and 43 deletions
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@ -6,6 +6,7 @@
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#
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import subprocess
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import os
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import sys
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from helpers import * # prettyMac etc
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MAC_LAPTOP = [0xdc, 0x0e, 0xa1, 0x11, 0x67, 0x08 ] # Win10 laptop
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@ -34,6 +35,12 @@ class addressManager():
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# On windows we can use command line tool "ipconfig".
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# The link-local addresses always start with fe80::, so we just parse the output of ipconfig line-by-line.
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# If we have multiple interfaces (e.g. ethernet and WLAN), it will find multiple link-local-addresses.
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#
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# On Linux, we use "ip addr". From its output we can directly see the ethernet IPv6 and MAC, even if
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# there are multiple other interfaces (e.g. WLAN). Pitfall: As long as there is nothing connected to the
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# ethernet, the Raspberry will not tell a link-local IPv6 in the command "ip addr". This means, we must
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# make sure that the modem is connected and powered, when the script is starting.
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ba = bytearray(6)
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foundAddresses = []
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if os.name == 'nt':
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# on Windows
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@ -49,6 +56,8 @@ class addressManager():
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foundAddresses.append(line[k+1:])
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else:
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# on Raspberry
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cfg_useOldStyleIfconfig = 0
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if (cfg_useOldStyleIfconfig!=0):
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result = subprocess.run(["ifconfig"], capture_output=True, text=True)
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if (len(result.stderr)>0):
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print(result.stderr)
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@ -63,6 +72,61 @@ class addressManager():
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sIp = sIpWithText[0:x]
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# print("[addressManager] IP=>" + sIp + "<")
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foundAddresses.append(sIp)
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else: # instead of the deprecated ifconfig, use "ip addr"
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result = subprocess.run(["ip", "addr"], capture_output=True, text=True)
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if (len(result.stderr)>0):
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print(result.stderr)
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else:
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blInTheEthernetChapter = 0
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lines = result.stdout.split("\n")
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for line in lines:
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# print(line);
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if (line[0:1]!=" "): # if the line does not start with a blank, then it is a heading, e.g.
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# 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
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# 3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
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# print("This is a heading")
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if (line.find(": eth")>0):
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# print("This is the heading for the ethernet.")
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blInTheEthernetChapter = 1 # we are in the ethernet chapter
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else:
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blInTheEthernetChapter = 0 # we are not in the ethernet chapter
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else:
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# The line started with a blank. This means, it is no heading.
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# In the best case, we find here something like
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# inet6 fe80::181f:efdf:97e5:2191/64 scope link
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if ((blInTheEthernetChapter==1) and (line.find(" inet6")>0) and (line.find(" scope link")>0)):
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k = line.find(" fe80::") # the beginning of the IPv6
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if (k>0):
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sIpWithText = line[k+1:]
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x = sIpWithText.find(" ") # the space is the end of the IPv6
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sIp = sIpWithText[0:x]
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x = sIp.find("/") # remove the /64 at the end
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if (x>0):
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sIp = sIp[0:x]
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# print("[addressManager] IP=>" + sIp + "<")
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foundAddresses.append(sIp)
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# Also the ethernet MAC is visible here, something like
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# link/ether b8:27:eb:27:33:53 brd ff:ff:ff:ff:ff:ff
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if ((blInTheEthernetChapter==1) and (line.find(" link/ether")>0)):
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# print(line)
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k = line.find("link/ether ")
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# print(k)
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strMac = line[k+11:k+28]
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# e.g. "b8:27:eb:12:34:56"
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# print(strMac)
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# Remove all ":"
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strMac = strMac.replace(":", "")
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# print(strMac)
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if (len(strMac)!=12):
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print("[addressManager] ERROR: invalid length of MAC string. Expected be 6 bytes, means 12 hex characters. Found " + str(len(strMac)))
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else:
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for i in range(0, 6):
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sTwoChar = strMac[2*i : 2*i+2]
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ba[i] = int(sTwoChar, 16)
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self.localMac = ba
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print("[addressManager] we have local MAC " + prettyMac(self.localMac) + ".")
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print("[addressManager] Found " + str(len(foundAddresses)) + " link-local IPv6 addresses.")
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for a in foundAddresses:
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@ -71,6 +135,10 @@ class addressManager():
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if (len(self.localIpv6Addresses)==0):
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print("[addressManager] Error: No local Ipv6 address was found.")
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self.localIpv6Address = "localhost"
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cfg_exitIfNoLocalLinkAddressIsFound = 1
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if (cfg_exitIfNoLocalLinkAddressIsFound!=0):
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print("Exiting, because it does not make sense to continue without IPv6 address");
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sys.exit(1);
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else:
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# at least one address was found. Take the first one (this may be the wrong adaptor).
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self.localIpv6Address = self.localIpv6Addresses[0]
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@ -89,31 +157,8 @@ class addressManager():
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print("[addressManager] we have local MAC " + prettyMac(self.localMac) + ". Todo: find this out dynamically.")
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else:
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# on raspberry
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# We use "ifconfig", and search for the line which says "ether <mac> ..."
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result = subprocess.run(["ifconfig"], capture_output=True, text=True)
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if (len(result.stderr)>0):
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print(result.stderr)
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else:
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lines = result.stdout.split("\n")
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for line in lines:
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if (line.find(" ether ")>0) and (line.find("(Ethernet)")>0):
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# print(line)
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k = line.find(" ether ")
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# print(k)
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strMac = line[k+7:k+24]
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# e.g. "b8:27:eb:12:34:56"
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# print(strMac)
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# Remove all ":"
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strMac = strMac.replace(":", "")
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#print(strMac)
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if (len(strMac)!=12):
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print("[addressManager] ERROR: invalid length of MAC string. Expected be 6 bytes, means 12 hex characters. Found " + str(len(strMac)))
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else:
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for i in range(0, 6):
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sTwoChar = strMac[2*i : 2*i+2]
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ba[i] = int(sTwoChar, 16)
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self.localMac = ba
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print("[addressManager] we have local MAC " + prettyMac(self.localMac) + ".")
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# nothing to do here. The MAC address is found together with the IPv6 address above.
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pass
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def setPevMac(self, pevMac):
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# During the SLAC, the MAC of the PEV was found out. Store it, maybe we need it later.
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@ -23,7 +23,6 @@ class pyPlcWorker():
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self.mode = mode
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self.strUserAction = ""
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self.addressManager = addressManager.addressManager()
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self.addressManager.findLinkLocalIpv6Address()
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self.callbackAddToTrace = callbackAddToTrace
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self.callbackShowStatus = callbackShowStatus
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self.oldAvlnStatus = 0
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@ -44,8 +43,10 @@ class pyPlcWorker():
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self.pev = fsmPev.fsmPev(self.addressManager, self.workerAddToTrace, self.hardwareInterface, self.showStatus)
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def __del__(self):
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if (self.mode == C_PEV_MODE):
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print("worker: deleting pev")
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try:
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del(self.pev)
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except:
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pass
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def workerAddToTrace(self, s):
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# The central logging function. All logging messages from the different parts of the project
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