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SC_REMOTED(1) FreeBSD General Commands Manual SC_REMOTED(1) NAME sc_remoted -- interact with a collection of remotely controlled scamper instances SYNOPSIS sc_remoted [-?46D] [-O options] [-P [ip:]port] [-U directory] [-c tls-certificate] [-p tls-privatekey] [-e pidfile] [-Z zombie-time] DESCRIPTION The sc_remoted utility provides the ability to connect to a scamper(1) instance running remotely and interact with it by issuing commands and receiving results in warts format. The options are as follows: -? prints a list of command line options and a synopsis of each. -D causes sc_remoted to operate as a daemon. -4 causes sc_remoted to only listen for IPv4-based connections. -6 causes sc_remoted to only listen for IPv6-based connections. -O options allows the behavior of sc_remoted to be further tailored. The current choices for this option are: - allowgroup: allow members of the unix domain socket's group to access to the unix domain sockets created by sc_remoted - allowother: allow anyone on the system access to the unix domain sockets created by sc_remoted - debug: print debugging messages - select: use select(2) with all sockets, rather than epoll(2) or kqueue(2) -P [ip:]port specifies the IP address and port on the local host where sc_remoted should listen for incoming connections. If an IP ad- dress is not specified, sc_remoted will listen on all available IP addresses for incoming connections. -U directory specifies the directory on the local host where unix domain sock- ets corresponding to remote hosts should be placed. -c tls-certificate specifies the server certificate file in PEM format to advertise to remote scamper(1) instances. -p tls-privatekey specifies the private key file in PEM format that corresponds to the certificate file. This key should have a passphrase. sc_remoted will prompt for the passphrase when starting up. -e pidfile specifies the name of a file to write the process ID to. -Z zombie-time specifies the length of time sc_remoted will retain state for a disconnected scamper(1) instance, allowing it to resume. By de- fault sc_remoted retains state for 15 minutes. EXAMPLES The intended use of the remote control socket built into scamper(1) is as follows. A central server with IP addresses 192.0.2.1 and 2001:db8::1 runs a sc_remoted process listening on a port for remote scamper process, placing control sockets in a specified directory: sc_remoted -P 31337 -U scamper-remote-sockets Then, a remote host with IP address 198.51.100.55 runs scamper and con- nects to the remote controller: scamper -R 192.0.2.1:31337 The sc_remoted process places a unix domain socket in the directory cor- responding to the remote process. The name corresponds to the source IP address and port the remote scamper process connected to controller with. If the scamper process used source port 1025, then the unix domain socket's name will be scamper-remote-sockets/198.51.100.55:1025 If a second remote host with IP address 2001:db8:1234::1 runs scamper and connects to the remote controller: scamper -R [2001:db8::1]:31337 The same sc_remoted process will place another unix domain socket in the directory corresponding to the remote process. If the scamper process used source port 1026, then the unix domain socket's name will be scamper-remote-sockets/2001:db8:1234::1.1026 USING TRANSPORT LAYER SECURITY sc_remoted and scamper support the use of transport layer security (TLS) using OpenSSL to authenticate and encrypt communications between sc_remoted and scamper. To use this support requires a public certifi- cate signed by a certificate authority. Scamper will verify the certifi- cate presented by sc_remoted and disconnect if the certificate presented by sc_remoted cannot be validated. Generating a certificate that will be accepted by scamper requires you to create a certificate request and pass it for signing to a certificate au- thority. To generate a private key in file remotepriv.pem, and a request to sign the key in remotereq.pem: openssl req -new -keyout remotepriv.pem -out remotereq.pem and then send the remotereq.pem file to the certificate authority for signing. Do not send remotepriv.pem; that key must remain private to you. When openssl prompts for a passphrase, choose a passphrase that is unique and keep the passphrase secret. When your chosen certificate au- thority signs your private key, it will return a file which we will call remotecert.pem. Both remotecert.pem and remotepriv.pem are required pa- rameters to sc_remoted to enable TLS support: sc_remoted -P 31337 -U scamper-remote-sockets -c remotecert.pem -p remotepriv.pem and then passing the -O tls option to scamper: scamper -R example.com:31337 -O tls SIGNAL HANDLERS sc_remoted installs handlers for two signals: SIGINT and SIGHUP. SIGINT causes sc_remoted to exit gracefully. SIGHUP causes sc_remoted to reload the TLS certificate and private key, without interrupting existing TLS connections. SEE ALSO scamper(1), sc_attach(1), sc_wartsdump(1), warts(5), openssl(1) AUTHORS sc_remoted was written by Matthew Luckie <mjl@luckie.org.nz>. FreeBSD 13.0 March 28, 2020 FreeBSD 13.0
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | USING TRANSPORT LAYER SECURITY | SIGNAL HANDLERS | SEE ALSO | AUTHORS
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