Simons blog::feed

k · 2023-04-27


    curl -fsSL https://tailscale.com/install.sh | sh


sudo tailscale up --ssh


"ssh": [
    {
        "action": "accept",
        "src":    ["tag:phone", "tag:laptop"],
        "dst":    ["tag:server"],
        "users":  ["autogroup:nonroot"],
    },
],
"tagOwners": {
    "tag:server":     ["username@github"],
    "tag:phone":      ["username@github"],
    "tag:laptop":     ["username@github"],
},


sudo tailscale up
ssh simon@server


    simon@X220:~$ wget --quiet http://www.cryptomilk.org/0xCC014E3D-asn@cryptomilk.org-gpg_key.asc
    simon@X220:~$ gpg --import 0xCC014E3D-asn@cryptomilk.org-gpg_key.asc
    gpg: key CC014E3D: public key "Andreas Schneider " imported
    gpg: Total number processed: 1
    gpg:               imported: 1  (RSA: 1)
    gpg: no ultimately trusted keys found


    simon@X220:~$ mkdir sockets
    simon@X220:~$ cd sockets
    simon@X220:~/sockets$ wget --quiet https://ftp.samba.org/pub/cwrap/socket_wrapper-1.0.1.tar.gz
    simon@X220:~/sockets$ wget --quiet https://ftp.samba.org/pub/cwrap/socket_wrapper-1.0.1.tar.asc
    simon@X220:~/sockets$ gzip -d socket_wrapper-1.0.1.tar.gz
    simon@X220:~/sockets$ gpg --verify socket_wrapper-1.0.1.tar.asc
    gpg: Signature made Tue 04 Feb 2014 16:04:36 GMT using RSA key ID CC014E3D
    gpg: Good signature from "Andreas Schneider "
    gpg:                 aka "Andreas Schneider "
    gpg: WARNING: This key is not certified with a trusted signature!
    gpg:          There is no indication that the signature belongs to the owner.
    Primary key fingerprint: 8DFF 53E1 8F2A BC8D 8F3C  9223 7EE0 FC4D CC01 4E3D
    simon@X220:~/sockets$ tar -xf socket_wrapper-1.0.1.tar
    simon@X220:~/sockets$ cd socket_wrapper-1.0.1/
    simon@X220:~/sockets/socket_wrapper-1.0.1$ mkdir builddir
    simon@X220:~/sockets/socket_wrapper-1.0.1$ cd builddir/


    simon@X220:~/sockets/socket_wrapper-1.0.1/builddir$ sudo aptitude install cmake


    simon@X220:~/sockets/socket_wrapper-1.0.1/builddir$ cmake .. -DCMAKE_INSTALL_PREFIX:PATH=~/sockets/bin
    -- The C compiler identification is GNU 4.7.3
    -- Check for working C compiler: /usr/bin/cc
    -- Check for working C compiler: /usr/bin/cc -- works
    ......
    -- Configuring done
    -- Generating done
    -- Build files have been written to: /home/simon/sockets/socket_wrapper-1.0.1/builddir
    simon@X220:~/sockets/socket_wrapper-1.0.1/builddir$ make && make install
    Scanning dependencies of target socket_wrapper
    [100%] Building C object src/CMakeFiles/socket_wrapper.dir/socket_wrapper.c.o
    Linking C shared library libsocket_wrapper.so
    [100%] Built target socket_wrapper
    [100%] Built target socket_wrapper
    Install the project...
    -- Install configuration: ""
    -- Installing: /home/simon/sockets/bin/lib/pkgconfig/socket_wrapper.pc
    -- Installing: /home/simon/sockets/bin/lib/cmake/socket_wrapper-config-version.cmake
    -- Installing: /home/simon/sockets/bin/lib/cmake/socket_wrapper-config.cmake
    -- Installing: /home/simon/sockets/bin/lib/libsocket_wrapper.so.0.0.1
    -- Installing: /home/simon/sockets/bin/lib/libsocket_wrapper.so.0
    -- Installing: /home/simon/sockets/bin/lib/libsocket_wrapper.so


    simon@X220:~/sockets/socket_wrapper-1.0.1/builddir$ cd ~/sockets/bin/
    simon@X220:~/sockets/bin$ mktemp -d
    /tmp/tmp.hxyAQf3Pda
    simon@X220:~/sockets/bin$ LD_PRELOAD=lib/libsocket_wrapper.so \
    > SOCKET_WRAPPER_DIR=/tmp/tmp.hxyAQf3Pda \
    > SOCKET_WRAPPER_DEFAULT_IFACE=10 nc -v -l 127.0.0.10 7
    Listening on [127.0.0.10] (family 0, port 7)


    simon@X220:~/sockets/bin$ LD_PRELOAD=lib/libsocket_wrapper.so \
    > SOCKET_WRAPPER_DIR=/tmp/tmp.hxyAQf3Pda \
    > SOCKET_WRAPPER_DEFAULT_IFACE=10 nc -v 127.0.0.10 7
    Connection to 127.0.0.10 7 port [tcp/echo] succeeded!
    Hello!


    simon@X220:~/sockets/bin$ LD_PRELOAD=lib/libsocket_wrapper.so \
    > SOCKET_WRAPPER_DIR=/tmp/tmp.hxyAQf3Pda \
    > SOCKET_WRAPPER_DEFAULT_IFACE=10 nc -v -l 127.0.0.10 7
    Listening on [127.0.0.10] (family 0, port 7)
    Connection from [127.0.0.10] port 7 [tcp/echo] accepted (family 2, sport 41505)
    Hello!


    simon@X220:~/sockets/bin$ file /tmp/tmp.hxyAQf3Pda/* && lsof /tmp/tmp.hxyAQf3Pda/*
    /tmp/tmp.hxyAQf3Pda/T0A0007: socket
    /tmp/tmp.hxyAQf3Pda/T0AA221: socket
    COMMAND   PID  USER   FD   TYPE             DEVICE SIZE/OFF    NODE NAME
    nc      31334 simon    5u  unix 0x0000000000000000      0t0 2265223 /tmp/tmp.hxyAQf3Pda/T0A0007
    nc      31505 simon    3u  unix 0x0000000000000000      0t0 2267187 /tmp/tmp.hxyAQf3Pda/T0AA221


    simon@X220:~$ mkdir -p nginx-local/www
    simon@X220:~$ touch nginx-local/www/test
    simon@X220:~$ cd nginx-local
    simon@X220:~/nginx-local$ vi nginx.conf
    error_log /home/simon/nginx-local/error.log;
    worker_processes 1;
    events {
        worker_connections 3;
    }
    http {
        server {
            listen 127.0.0.10:7;
            root /home/simon/nginx-local/www;
            location / {
                autoindex on;
                access_log off;
            }
        }
    }

    simon@X220:~/nginx-local$ LD_PRELOAD=/home/simon/sockets/bin/lib/libsocket_wrapper.so \
    > SOCKET_WRAPPER_DIR=/tmp/tmp.hxyAQf3Pda \
    > SOCKET_WRAPPER_DEFAULT_IFACE=10 \
    > /usr/sbin/nginx -c /home/simon/nginx-local/nginx.conf \
    > -g "pid /home/simon/nginx-local/nginx.pid;"


    Note: You may receive an [alert] warning from nginx, that is cannot read the default error_log.
    As of version 0.7.53, nginx will use the compiled-in default error log before, reading in
    the config file.


    simon@X220:~/nginx-local$ netstat -nlp | grep $(cat ~/nginx-local/nginx.pid)
    (Not all processes could be identified, non-owned process info
     will not be shown, you would have to be root to see it all.)
    unix  2      [ ACC ]     STREAM     LISTENING     2266669  919/nginx.pid;      /tmp/tmp.hxyAQf3Pda/T0A0007


    simon@X220:~/nginx-local$ LD_PRELOAD=/home/simon/sockets/bin/lib/libsocket_wrapper.so \
    > SOCKET_WRAPPER_DIR=/tmp/tmp.hxyAQf3Pda \
    > SOCKET_WRAPPER_PCAP_FILE=/tmp/nginx.pcap \
    > SOCKET_WRAPPER_DEFAULT_IFACE=10 telnet 127.0.0.10 7
    Trying 127.0.0.10...
    Connected to 127.0.0.10.
    Escape character is '^]'.
    GET / HTTP/1.1
    Host: 127.0.0.10

    HTTP/1.1 200 OK
    Server: nginx/1.2.6 (Ubuntu)
    Date: Thu, 01 May 2014 15:26:31 GMT
    Content-Type: text/html
    Transfer-Encoding: chunked
    Connection: keep-alive

    104
    &lt;html&gt;
    &lt;head&gt;&lt;title&gt;Index of /&lt;/title&gt;&lt;/head&gt;
    &lt;body bgcolor=&quot;white&quot;&gt;
    &lt;h1&gt;Index of /&lt;/h1&gt;&lt;hr&gt;&lt;pre&gt;&lt;a href=&quot;../&quot;&gt;../&lt;/a&gt;
    &lt;a href=&quot;test&quot;&gt;test&lt;/a&gt;                                               01-May-2014 14:10                   0
    &lt;/pre&gt;&lt;hr&gt;&lt;/body&gt;
    &lt;/html&gt;
    0

    simon@X220:~/nginx-local$ kill -QUIT $(cat /home/simon/nginx-local/nginx.pid)


    simon@X220:~/nginx-local$ wireshark /tmp/nginx.pcap


    simon@X220:~/nss_wrapper$ echo "127.0.0.10  simonsblog.co.uk" > hosts
    simon@X220:~/nss_wrapper$ LD_PRELOAD="bin/lib/libnss_wrapper.so" \
    > NSS_WRAPPER_HOSTS=hosts \
    > python -c "import socket; print(socket.gethostbyname('simonsblog.co.uk'))"
    127.0.0.10


    simon@X220:~$ dig +short simonsblog.co.uk mx
    20 in2-smtp.messagingengine.com.
    10 in1-smtp.messagingengine.com.


    simon@X220:~$ dig simonsblog.co.uk +short spf
    "v=spf1 include:spf.messagingengine.com -all"


    simon@X220:~$ dig +short mail.simonsblog.co.uk cname
    www.fastmail.fm.

Simons blog::feed

Playlist

Playlist

Trying out Tailscale

Trying out Tailscale

Approximate Pi (monte carlo method)

Approximate Pi (monte carlo method)

Collected rules

Collected rules

Sockets and cwrap

Sockets and cwrap

Switching from Gmail to Fastmail

Switching from Gmail to Fastmail

Tiling window manager: i3

Tiling window manager: i3

Rotate arbitrary

Rotate arbitrary

Favourite quotes

Favourite quotes

Test driven development with Django

Test driven development with Django