Towards first version.
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urosj
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13a5afb5fc
commit
70713c71d8
@ -2,24 +2,75 @@ package main
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// This is postfix autoresponder, which is rewrite of the autoresponder bash script V1.6.3, written by Charles Hamilton - musashi@nefaria.com
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//
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// How to make it work on a server with postfix installed:
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// =======================================================
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// Create autoresponse username:
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// useradd -d /var/spool/autoresponse -s `which nologin` autoresponse
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//
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// Copy autoresponse binary to /usr/local/sbin
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// cp autoresponse /usr/local/sbin/
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//
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// RESPONSE_DIR, RATE_LOG_DIR must be created:
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// mkdir -p /var/spool/autoresponse/log /var/spool/autoresponse/responses
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// chown -R autoresponse:autoresponse /var/spool/autoresponse
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// chmod -R 0770 /var/spool/autoresponse
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//
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// Edit /etc/postfix/master.cf:
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// Replace line:
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// smtp inet n - - - - smtpd
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// with these two lines (second must begin with at least one space or tab):
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// smtp inet n - - - - smtpd
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// -o content_filter=autoresponder:dummy
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// At the end of file append the following two lines:
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// autoresponder unix - n n - - pipe
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// flags=Fq user=autoresponse argv=/usr/local/sbin/autoresponse -s ${sender} -r ${recipient} -S ${sasl_username} -C ${client_address}
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//
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//
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// Written by Uros Juvan <asmpro@gmail.com> 2017
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import (
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"fmt"
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"flag"
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"os"
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"strings"
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"log/syslog"
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)
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const VERSION = "1.0.0001"
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const DEBUG = true
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const RESPONSE_DIR = "/var/spool/autoresponse/responses"
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const RATE_LOG_DIR = "/var/spool/autoresponse/log"
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const SENDMAIL_BIN = "/usr/sbin/sendmail"
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// Function using fmt.Printf for debug printing, but only if DEBUG is true
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func DebugFmtPrintf(format string, v ...interface{}) {
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if DEBUG {
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fmt.Printf("DEBUG: " + format, v...)
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}
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}
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func DebugSyslogFmt(syslg *syslog.Writer, format string, v ...interface{}) {
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if DEBUG {
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syslg.Debug(fmt.Sprintf("DEBUG: " + format, v...))
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}
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}
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// Set autoresponse using supplied arguments and stdin (email body)
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func setAutoresponseViaEmail(recipient, sender, saslUser, clientIp string) error {
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//!!!
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return nil
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}
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func main() {
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// Connect to syslog
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syslg, err := syslog.New(syslog.LOG_MAIL, "autoresponder")
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if err != nil {
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os.Exit(1)
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}
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defer syslg.Close()
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// Parse command line arguments
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recipientPtr := flag.String("r", "", "Recipient e-mail")
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senderPtr := flag.String("s", "", "Sender e-mail")
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@ -29,27 +80,47 @@ func main() {
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disableAutoResponsePtr := flag.String("d", "", "Disable autoresponse")
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enableExAutoResponsePtr := flag.String("E", "", "Enable existing autoresponse")
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deleteAutoResponsePtr := flag.String("D", "", "Delete autoresponse")
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instructions := flag.Bool("i", false, "Setup instructions")
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flag.Parse()
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if DEBUG {
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DebugFmtPrintf(`Flags:
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Recipient: %v
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Sender: %v
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SASL authenticated username: %v
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Client IP: %v
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Enable autoresponse: %v
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Disable autoresponse: %v
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Enable existing autoresponse: %v
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Delete autoresponse: %v
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`,
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*recipientPtr,
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*senderPtr,
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*saslUserPtr,
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*clientIpPtr,
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*enableAutoResponsePtr,
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*disableAutoResponsePtr,
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*enableExAutoResponsePtr,
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*deleteAutoResponsePtr)
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DebugSyslogFmt(syslg, "Flags: Recipient: %v, Sender: %v, SASL authenticated username: %v, Client IP: %v, Enable autoresponse: %v, Disable autoresponse: %v, Enable existing autoresponse: %v, Delete autoresponse: %v, Setup instructions: %v",
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*recipientPtr,
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*senderPtr,
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*saslUserPtr,
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*clientIpPtr,
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*enableAutoResponsePtr,
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*disableAutoResponsePtr,
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*enableExAutoResponsePtr,
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*deleteAutoResponsePtr,
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*instructions)
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// If setup instructions are requested, just print them to stdout and exit
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if *instructions {
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fmt.Print(`
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How to make it work on a server with postfix installed:
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=======================================================
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Create autoresponse username:
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useradd -d /var/spool/autoresponse -s $(which nologin) autoresponse
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Copy autoresponse binary to /usr/local/sbin
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cp autoresponse /usr/local/sbin/
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RESPONSE_DIR, RATE_LOG_DIR must be created:
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mkdir -p /var/spool/autoresponse/log /var/spool/autoresponse/responses
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chown -R autoresponse:autoresponse /var/spool/autoresponse
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chmod -R 0770 /var/spool/autoresponse
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Edit /etc/postfix/master.cf:
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Replace line:
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smtp inet n - - - - smtpd
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with these two lines (second must begin with at least one space or tab):
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smtp inet n - - - - smtpd
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-o content_filter=autoresponder:dummy
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At the end of file append the following two lines:
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autoresponder unix - n n - - pipe
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flags=Fq user=autoresponse argv=/usr/local/sbin/autoresponse -s ${sender} -r ${recipient} -S ${sasl_username} -C ${client_address}
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`)
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os.Exit(0)
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}
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// Do some logic on command line arguments
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@ -63,11 +134,35 @@ func main() {
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if *recipientPtr != "" && *senderPtr != "" {
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sendResponse = true
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}
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if *saslUserPtr != "" && os.Getenv("SASL_USERNAME") != "" {
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if *saslUserPtr != "" {
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authenticated = true
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}
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if *enableAutoResponsePtr != "" || *disableAutoResponsePtr != "" || *enableExAutoResponsePtr != "" || *deleteAutoResponsePtr != "" {
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mode = 1
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}
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DebugFmtPrintf("mode=%v, sendResponse=%v, authenticated=%v\n", mode, sendResponse, authenticated)
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DebugSyslogFmt(syslg, "mode=%v, sendResponse=%v, authenticated=%v\n", mode, sendResponse, authenticated)
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recipientParts := strings.Split(*recipientPtr, "@")
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senderParts := strings.Split(*senderPtr, "@")
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// Little more validation of recipient and sender
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if len(recipientParts) < 2 {
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syslg.Err(fmt.Sprintf("Invalid recipient %v", *recipientPtr))
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os.Exit(1)
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}
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if len(senderParts) < 2 {
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syslg.Err(fmt.Sprintf("Invalid sender %v", *senderPtr))
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os.Exit(1)
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}
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// And now descision making
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DebugSyslogFmt(syslg, "recipientUser=%v =? senderUser=%v\n", recipientParts[0], senderParts[0] + "+autoresponse")
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if mode == 0 && authenticated && recipientParts[0] == senderParts[0] + "+autoresponse" {
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syslg.Info(fmt.Sprintf("Requested autoresponse (un)set via email for email %v", *senderPtr))
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err := setAutoresponseViaEmail(*recipientPtr, *senderPtr, *saslUserPtr, *clientIpPtr)
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if err != nil {
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syslg.Err(err.Error())
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os.Exit(1)
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}
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}
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//!!!
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}
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