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148 lines
3.9 KiB
Markdown
148 lines
3.9 KiB
Markdown
[](https://travis-ci.org/RackSec/srslog)
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# srslog
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Go has a `syslog` package in the standard library, but it has the following
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shortcomings:
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1. It doesn't have TLS support
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2. [According to bradfitz on the Go team, it is no longer being maintained.](https://github.com/golang/go/issues/13449#issuecomment-161204716)
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I agree that it doesn't need to be in the standard library. So, I've
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followed Brad's suggestion and have made a separate project to handle syslog.
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This code was taken directly from the Go project as a base to start from.
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However, this _does_ have TLS support.
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# Usage
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Basic usage retains the same interface as the original `syslog` package. We
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only added to the interface where required to support new functionality.
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Switch from the standard library:
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```
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import(
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//"log/syslog"
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syslog "github.com/RackSec/srslog"
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)
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```
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You can still use it for local syslog:
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```
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w, err := syslog.Dial("", "", syslog.LOG_ERR, "testtag")
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```
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Or to unencrypted UDP:
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```
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w, err := syslog.Dial("udp", "192.168.0.50:514", syslog.LOG_ERR, "testtag")
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```
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Or to unencrypted TCP:
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```
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w, err := syslog.Dial("tcp", "192.168.0.51:514", syslog.LOG_ERR, "testtag")
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```
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But now you can also send messages via TLS-encrypted TCP:
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```
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w, err := syslog.DialWithTLSCertPath("tcp+tls", "192.168.0.52:514", syslog.LOG_ERR, "testtag", "/path/to/servercert.pem")
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```
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And if you need more control over your TLS configuration :
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```
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pool := x509.NewCertPool()
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serverCert, err := ioutil.ReadFile("/path/to/servercert.pem")
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if err != nil {
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return nil, err
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}
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pool.AppendCertsFromPEM(serverCert)
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config := tls.Config{
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RootCAs: pool,
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}
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w, err := DialWithTLSConfig(network, raddr, priority, tag, &config)
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```
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(Note that in both TLS cases, this uses a self-signed certificate, where the
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remote syslog server has the keypair and the client has only the public key.)
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And then to write log messages, continue like so:
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```
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if err != nil {
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log.Fatal("failed to connect to syslog:", err)
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}
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defer w.Close()
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w.Alert("this is an alert")
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w.Crit("this is critical")
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w.Err("this is an error")
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w.Warning("this is a warning")
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w.Notice("this is a notice")
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w.Info("this is info")
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w.Debug("this is debug")
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w.Write([]byte("these are some bytes"))
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```
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If you need further control over connection attempts, you can use the DialWithCustomDialer
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function. To continue with the DialWithTLSConfig example:
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```
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netDialer := &net.Dialer{Timeout: time.Second*5} // easy timeouts
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realNetwork := "tcp" // real network, other vars your dail func can close over
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dial := func(network, addr string) (net.Conn, error) {
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// cannot use "network" here as it'll simply be "custom" which will fail
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return tls.DialWithDialer(netDialer, realNetwork, addr, &config)
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}
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w, err := DialWithCustomDialer("custom", "192.168.0.52:514", syslog.LOG_ERR, "testtag", dial)
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```
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Your custom dial func can set timeouts, proxy connections, and do whatever else it needs before returning a net.Conn.
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# Generating TLS Certificates
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We've provided a script that you can use to generate a self-signed keypair:
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```
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pip install cryptography
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python script/gen-certs.py
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```
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That outputs the public key and private key to standard out. Put those into
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`.pem` files. (And don't put them into any source control. The certificate in
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the `test` directory is used by the unit tests, and please do not actually use
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it anywhere else.)
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# Running Tests
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Run the tests as usual:
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```
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go test
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```
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But we've also provided a test coverage script that will show you which
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lines of code are not covered:
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```
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script/coverage --html
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```
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That will open a new browser tab showing coverage information.
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# License
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This project uses the New BSD License, the same as the Go project itself.
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# Code of Conduct
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Please note that this project is released with a Contributor Code of Conduct.
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By participating in this project you agree to abide by its terms.
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