linux – Failure to recv simple multicst packet traffic

I have a multicast src sending logging packets via multicast (226.1.2.3 port 9992) over ethernet (ifc em1) in a linuxlite box. Wireshark shows the (226.1.2.3 pt9992 ) packets arriving on the ethernet ifc but the simple client program does not ever recv them. The firewall log shows they are being allowed though.

( 1040.797059) (UFW AUDIT) IN=em1 OUT= MAC=01:00:5e:01:02:03:a0:21:b7:a9:68:d5:08:00 SRC=172.16.1.1 DST=226.1.2.3 LEN=29 TOS=0x00 PREC=0x00 TTL=1 ID=14399 DF PROTO=UDP SPT=51546 DPT=9992 LEN=9

ifconfig shows

em1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.16.1.10  netmask 255.0.0.0  broadcast 172.255.255.255
        inet6 fe80::1f91:481a:e82:fba9  prefixlen 64  scopeid 0x20<link>
        ether 00:22:4d:7b:0a:74  txqueuelen 1000  (Ethernet)
        RX packets 822  bytes 300699 (300.6 KB)
        RX errors 0  dropped 58  overruns 0  frame 0
        TX packets 554  bytes 54942 (54.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 20  memory 0xfe700000-fe720000  

and a netstat -g shows the recv code has correctly registered the multicast group on em1

IPv6/IPv4 Group Memberships
Interface       RefCnt Group
--------------- ------ ---------------------
lo              1      224.0.0.251
lo              1      all-systems.mcast.net
em1             1      226.1.2.3
em1             1      224.0.0.251
em1             1      all-systems.mcast.net
wlx00259c0      1      224.0.0.251
wlx00259c0      1      all-systems.mcast.net
lo              1      ff02::fb
lo              1      ip6-allnodes
lo              1      ff01::1
em1             1      ff02::fb
em1             1      ff02::1:ff82:fba9
em1             1      ip6-allnodes
em1             1      ff01::1
wlx00259c055025 1      ff02::fb
wlx00259c055025 1      ff02::1:ff27:b7c8
wlx00259c055025 1      ip6-allnodes
wlx00259c055025 1      ff01::1

I’m at a loss to know what to check next, I have used various mmulticast recv programs from the net (as well as my own) and they all just sit their waiting for a packet to arrive(stuck in C library ‘recvfrom(….)).

I have tried over a wifi interface and also changed the multicast group and port, all the same result.

Any ideas really appreciated (I am not a linux guru so might be pilot error!)

Regards nick

Sniff USSD traffic without root privilege [closed]

I want to save every USSD message my phone send/receives. I failed to root my phone. I have tested tPacketCapture, Packet Capture and Debug Proxy, that use VPNs and don’t need root privileges but apparently are unable to save USSD traffic. Is there an application to do that somewhere?

privacy – Would a web server that replies to all requests with all responses be capable of achieving web traffic that cannot be traced between any two clients?

Consider a scenario where Client 1 wants to share information with Client 2 over a network fully monitored by a state actor, and achieve that communication while hiding:

  1. what each party sent.
  2. what target party each other party intended to communicate with.

Tor attempts to achieve this, however if the state actor hosts enough nodes of its own, it can create a high enough probability of hosting each party’s connection to eventually identify the parties communicating.

To avoid this vulnerability:

  1. Client 1 and Client 2 share a private encryption key in some manner that escapes the notice of the state actor, even if that means a physical exchange of USB drives.
  2. Then they connect to a node which waits for millions of requests to occur, each containing encrypted information to be communicated, bundles it all together, and sends the entire bundle of information back to every client involved.
  3. Client 1 and 2 then attempt to decrypt every item in the bundle until they successfully decrypt the information created with their private key.

The monitoring state actor would not be able to determine which client communicated with which other client, nor what anyone communicated, so long as they shared their keys privately. Even if the state actor took over the Privacy Node, it could only know which clients attempted to connect to it, not what they sent nor who they intended to communicate with. Nor could it spoof any response to the clients without knowing their keys.

Is there a flaw in the concept I’m considering? If so, what?

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