mirror of
https://github.com/decke/smtprelay.git
synced 2025-12-25 07:43:06 -07:00
Merge pull request #72 from decke/ff-config
Support environment variables for config
This commit is contained in:
Bernhard Fröhlich
GitHub
@@ -22,6 +22,7 @@ device which produces mail.
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## Main features
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* Simple configuration with ini file or environment variables
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* Supports SMTPS/TLS (465), STARTTLS (587) and unencrypted SMTP (25)
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* Checks for sender, receiver, client IP
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* Authentication support with file (LOGIN, PLAIN)
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104
config.go
104
config.go
@@ -1,16 +1,18 @@
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package main
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import (
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"bufio"
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"flag"
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"fmt"
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"io"
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"net"
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"os"
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"regexp"
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"strings"
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"time"
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"github.com/peterbourgon/ff/v3"
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"github.com/sirupsen/logrus"
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"github.com/vharitonsky/iniflags"
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)
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var (
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@@ -19,36 +21,44 @@ var (
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)
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var (
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logFile = flag.String("logfile", "", "Path to logfile")
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logFormat = flag.String("log_format", "default", "Log output format")
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logLevel = flag.String("log_level", "info", "Minimum log level to output")
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hostName = flag.String("hostname", "localhost.localdomain", "Server hostname")
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welcomeMsg = flag.String("welcome_msg", "", "Welcome message for SMTP session")
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listenStr = flag.String("listen", "127.0.0.1:25 [::1]:25", "Address and port to listen for incoming SMTP")
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flagset = flag.NewFlagSet("smtprelay", flag.ContinueOnError)
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// config flags
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logFile = flagset.String("logfile", "", "Path to logfile")
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logFormat = flagset.String("log_format", "default", "Log output format")
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logLevel = flagset.String("log_level", "info", "Minimum log level to output")
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hostName = flagset.String("hostname", "localhost.localdomain", "Server hostname")
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welcomeMsg = flagset.String("welcome_msg", "", "Welcome message for SMTP session")
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listenStr = flagset.String("listen", "127.0.0.1:25 [::1]:25", "Address and port to listen for incoming SMTP")
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localCert = flagset.String("local_cert", "", "SSL certificate for STARTTLS/TLS")
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localKey = flagset.String("local_key", "", "SSL private key for STARTTLS/TLS")
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localForceTLS = flagset.Bool("local_forcetls", false, "Force STARTTLS (needs local_cert and local_key)")
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readTimeoutStr = flagset.String("read_timeout", "60s", "Socket timeout for read operations")
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writeTimeoutStr = flagset.String("write_timeout", "60s", "Socket timeout for write operations")
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dataTimeoutStr = flagset.String("data_timeout", "5m", "Socket timeout for DATA command")
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maxConnections = flagset.Int("max_connections", 100, "Max concurrent connections, use -1 to disable")
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maxMessageSize = flagset.Int("max_message_size", 10240000, "Max message size in bytes")
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maxRecipients = flagset.Int("max_recipients", 100, "Max RCPT TO calls for each envelope")
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allowedNetsStr = flagset.String("allowed_nets", "127.0.0.0/8 ::1/128", "Networks allowed to send mails")
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allowedSenderStr = flagset.String("allowed_sender", "", "Regular expression for valid FROM EMail addresses")
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allowedRecipStr = flagset.String("allowed_recipients", "", "Regular expression for valid TO EMail addresses")
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allowedUsers = flagset.String("allowed_users", "", "Path to file with valid users/passwords")
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command = flagset.String("command", "", "Path to pipe command")
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remotesStr = flagset.String("remotes", "", "Outgoing SMTP servers")
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// additional flags
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_ = flagset.String("config", "", "Path to config file (ini format)")
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versionInfo = flagset.Bool("version", false, "Show version information")
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// internal
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listenAddrs = []protoAddr{}
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localCert = flag.String("local_cert", "", "SSL certificate for STARTTLS/TLS")
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localKey = flag.String("local_key", "", "SSL private key for STARTTLS/TLS")
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localForceTLS = flag.Bool("local_forcetls", false, "Force STARTTLS (needs local_cert and local_key)")
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readTimeoutStr = flag.String("read_timeout", "60s", "Socket timeout for read operations")
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readTimeout time.Duration
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writeTimeoutStr = flag.String("write_timeout", "60s", "Socket timeout for write operations")
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writeTimeout time.Duration
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dataTimeoutStr = flag.String("data_timeout", "5m", "Socket timeout for DATA command")
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dataTimeout time.Duration
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maxConnections = flag.Int("max_connections", 100, "Max concurrent connections, use -1 to disable")
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maxMessageSize = flag.Int("max_message_size", 10240000, "Max message size in bytes")
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maxRecipients = flag.Int("max_recipients", 100, "Max RCPT TO calls for each envelope")
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allowedNetsStr = flag.String("allowed_nets", "127.0.0.0/8 ::1/128", "Networks allowed to send mails")
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allowedNets = []*net.IPNet{}
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allowedSenderStr = flag.String("allowed_sender", "", "Regular expression for valid FROM EMail addresses")
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allowedSender *regexp.Regexp
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allowedRecipStr = flag.String("allowed_recipients", "", "Regular expression for valid TO EMail addresses")
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allowedRecipients *regexp.Regexp
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allowedUsers = flag.String("allowed_users", "", "Path to file with valid users/passwords")
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command = flag.String("command", "", "Path to pipe command")
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remotesStr = flag.String("remotes", "", "Outgoing SMTP servers")
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remotes = []*Remote{}
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versionInfo = flag.Bool("version", false, "Show version information")
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)
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func localAuthRequired() bool {
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@@ -184,7 +194,14 @@ func setupTimeouts() {
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}
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func ConfigLoad() {
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iniflags.Parse()
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// configuration parsing
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if err := ff.Parse(flagset, os.Args[1:],
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ff.WithEnvVarPrefix("smtprelay"),
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ff.WithConfigFileFlag("config"),
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ff.WithConfigFileParser(IniParser),
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); err != nil {
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os.Exit(1)
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}
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// Set up logging as soon as possible
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setupLogger()
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@@ -204,3 +221,42 @@ func ConfigLoad() {
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setupListeners()
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setupTimeouts()
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}
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// IniParser is a parser for config files in classic key/value style format. Each
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// line is tokenized as a single key/value pair. The first "=" delimited
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// token in the line is interpreted as the flag name, and all remaining tokens
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// are interpreted as the value. Any leading hyphens on the flag name are
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// ignored.
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func IniParser(r io.Reader, set func(name, value string) error) error {
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s := bufio.NewScanner(r)
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for s.Scan() {
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line := strings.TrimSpace(s.Text())
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if line == "" {
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continue // skip empties
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}
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if line[0] == '#' {
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continue // skip comments
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}
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var (
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name string
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value string
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index = strings.IndexRune(line, '=')
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)
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if index < 0 {
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name, value = line, "true" // boolean option
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} else {
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name, value = strings.TrimSpace(line[:index]), strings.Trim(strings.TrimSpace(line[index+1:]), "\"")
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}
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if i := strings.Index(value, " #"); i >= 0 {
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value = strings.TrimSpace(value[:i])
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}
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if err := set(name, value); err != nil {
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return err
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}
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}
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return nil
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}
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2
go.mod
2
go.mod
@@ -3,9 +3,9 @@ module github.com/decke/smtprelay
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require (
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github.com/chrj/smtpd v0.3.1
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github.com/google/uuid v1.3.0
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github.com/peterbourgon/ff/v3 v3.1.2
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github.com/sirupsen/logrus v1.8.1
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github.com/stretchr/testify v1.7.1
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github.com/vharitonsky/iniflags v0.0.0-20180513140207-a33cd0b5f3de
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golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4
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)
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7
go.sum
7
go.sum
@@ -1,3 +1,4 @@
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github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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github.com/chrj/smtpd v0.3.1 h1:kogHFkbFdKaoH3bgZkqNC9uVtKYOFfM3uV3rroBdooE=
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github.com/chrj/smtpd v0.3.1/go.mod h1:JtABvV/LzvLmEIzy0NyDnrfMGOMd8wy5frAokwf6J9Q=
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github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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@@ -5,6 +6,9 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
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github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
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github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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github.com/pelletier/go-toml v1.6.0/go.mod h1:5N711Q9dKgbdkxHL+MEfF31hpT7l0S0s/t2kKREewys=
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github.com/peterbourgon/ff/v3 v3.1.2 h1:0GNhbRhO9yHA4CC27ymskOsuRpmX0YQxwxM9UPiP6JM=
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github.com/peterbourgon/ff/v3 v3.1.2/go.mod h1:XNJLY8EIl6MjMVjBS4F0+G0LYoAqs0DTa4rmHHukKDE=
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github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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github.com/sirupsen/logrus v1.8.1 h1:dJKuHgqk1NNQlqoA6BTlM1Wf9DOH3NBjQyu0h9+AZZE=
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@@ -13,8 +17,6 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
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github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
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github.com/stretchr/testify v1.7.1 h1:5TQK59W5E3v0r2duFAb7P95B6hEeOyEnHRa8MjYSMTY=
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github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
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github.com/vharitonsky/iniflags v0.0.0-20180513140207-a33cd0b5f3de h1:fkw+7JkxF3U1GzQoX9h69Wvtvxajo5Rbzy6+YMMzPIg=
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github.com/vharitonsky/iniflags v0.0.0-20180513140207-a33cd0b5f3de/go.mod h1:irMhzlTz8+fVFj6CH2AN2i+WI5S6wWFtK3MBCIxIpyI=
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golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4 h1:kUhD7nTDoI3fVd9G4ORWrbV5NY0liEs/Jg2pv5f+bBA=
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golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
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golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -22,5 +24,6 @@ golang.org/x/sys v0.0.0-20220422013727-9388b58f7150 h1:xHms4gcpe1YE7A3yIllJXP16C
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golang.org/x/sys v0.0.0-20220422013727-9388b58f7150/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
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gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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@@ -1,19 +1,23 @@
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; smtprelay configuration
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;
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; All config parameters can also be provided as environment
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; variables in uppercase and the prefix "SMTPRELAY_".
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; (eg. SMTPRELAY_LOGFILE, SMTPRELAY_LOG_FORMAT)
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; Logfile (blank/default is stderr)
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;logfile =
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; Log format: default, plain (no timestamp), json
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;log_format = "default"
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;log_format = default
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; Log level: panic, fatal, error, warn, info, debug, trace
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;log_level = "info"
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;log_level = info
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; Hostname for this SMTP server
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;hostname = "localhost.localdomain"
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;hostname = localhost.localdomain
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; Welcome message for clients
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;welcome_msg = "<hostname> ESMTP ready."
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;welcome_msg = <hostname> ESMTP ready.
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; Listen on the following addresses for incoming
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; unencrypted connections.
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