I am writing a Python wrapper around Appium server. Appium accepts command-line parameter for a local port to bind to. Unfortunately, Appium cannot autoselect a free port for itself, so it either binds to explicitly specified port, or fails with EADDRINUSE. Even when telling it to bind to port 0, it will start successfully, but won’t display what port it
Tag: networking
Be confused with msg_name field in msghdr structure
In user space, I encapsulated a L3 packet using sock_raw (including IP header) and send to kernel space using sock_sendmsg() using msghdr structure I cannot understand clearly the roles of msg_name. I already specified the source IP and dest IP in L3 header. Why do I need msg_name? Answer The msg_name and msg_namelen fields of struct msghdr have the same
Bash parse output in route command
I am writing a bash script to register the remote hosts in a wireless network. I am getting the remote IPs, but I need help to parse the output. Here’s my output: I need to get these IPs and insert into a command like … <remote_ip_1> … How can it be done? I couldn’t find this case in the answers.
is rmem_default size per socket or for entire stack?
Does setting the net.core.rmem_default effect each socket or all sockets opened in the system? What is the maximum value I can configure for the net.core.rmem_default parameter? I understand it depends on RAM. Assume I have much RAM available. Answer net.core.rmem_default is the size of the incoming kernel socket buffer per one socket. From man socket(7): SO_RCVBUF Sets or gets the
Receive (recv) full request (e.g. curl HTTP)
How should this be done? I want to receive a (rather long) HTTP request and cannot get this to work. The problem: Without flags, recv does not read the whole message. I guess this is normal behavior. From what I understand using the MSG_WAITALL flag causes it to block until everything is received. However, in that case the call blocks
linux ip routing with multiple uplinks SINGLE interface
trying to setup a Proxmox machine that is running 3 vms. it has 3 public ips but these ips are on a single interface (eth0). the 3 vms are on a bridge (vmbr0) with an address of 172.16.0.1/24 I have enable ip masquerading and forwarding. but I cannot figure out how to make each of the 3 vms (172.16.0.2, 172.16.0.3,
Curl returned ststus 6 (DNS name bad address error)
I am unable to resolve host names when one(3g-cell) of my two interfaces is turned on. One interface is WAN(Ethernet), while the other is 3g-Cell. When WAN is turned off, I tried to do manual curl request and I was able to do it using 3g-cell interface, but was unable to do that using hostname. (same happened with the ping
How to connect raspberry pi to internet? [closed]
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iwlib trying to get access point name – u.addr.sa_data contains suspicious characters resulting empty QString
I have following simple method: Now, I would like to extract Access Point MAC address using this method from wrq structure – its u.addr.sa_data member, which (I THINK SO, AM NOT SURE) containts MAC address of Access Point. Follownig debug screenshot shows value of u.addr.sa_data member: Why am I getting empty QString after ueMACAddress=result>=0?QString(wrq.u.addr.sa_data):”Invalid MAC address”; line of code? Answer
C socket programming: Set ip header’s id to 0?
I want to send raw IP packets, which works perfectly fine, except for one field in the IP header. I need to set the IP id to 0. I tried it the following way: I then create a RAW_SOCKET with the IP_HDRINCL option set: I then create a buffer, containing my IP header, UDP header and the payload and send