From afcdef029e94bc381fe8fc2121afd428e1b7c42c Mon Sep 17 00:00:00 2001
From: Christopher Ramey <noreply@binarythought.com>
Date: Wed, 20 Jan 2021 07:31:22 -0900
Subject: [PATCH] email alarm now sends emails

---
 alarm/alarm_email.go | 61 +++++++++++++++++++++++++++++++++++++++++++-
 alrmrc               |  2 +-
 2 files changed, 61 insertions(+), 2 deletions(-)

diff --git a/alarm/alarm_email.go b/alarm/alarm_email.go
index db2b20a..253a971 100644
--- a/alarm/alarm_email.go
+++ b/alarm/alarm_email.go
@@ -2,6 +2,8 @@ package alarm
 
 import (
 	"fmt"
+	"net/smtp"
+	"os"
 	"strings"
 )
 
@@ -22,13 +24,64 @@ type AlarmEmail struct {
 }
 
 func NewAlarmEmail(name string) *AlarmEmail {
+	host, _ := os.Hostname()
+	if host == "" {
+		host = "localhost"
+	}
+
 	return &AlarmEmail{
 		Type: "email", Name: name,
+		From: "alrm@" + host, SMTP: "localhost:25",
 	}
 }
 
 func (a *AlarmEmail) Alarm() error {
-	fmt.Printf("email alarm\n")
+	c, err := smtp.Dial(a.SMTP)
+	if err != nil {
+		return err
+	}
+
+	helo := "localhost"
+	tspl := strings.Split(a.From, "@")
+	if len(tspl) > 1 {
+		helo = tspl[1]
+	}
+
+	err = c.Hello(helo)
+	if err != nil {
+		return err
+	}
+	err = c.Mail(a.From)
+	if err != nil {
+		return err
+	}
+	for _, to := range a.To {
+		err = c.Rcpt(to)
+		if err != nil {
+			return err
+		}
+	}
+	m, err := c.Data()
+	if err != nil {
+		return err
+	}
+
+	msg := fmt.Sprintf("From: %s\r\n", a.From)
+	msg += fmt.Sprintf("To: %s\r\n", strings.Join(a.To, ";"))
+	msg += fmt.Sprintf("Subject: %s\r\n", "test subject")
+
+	_, err = fmt.Fprintf(m, "%s", msg)
+	if err != nil {
+		return err
+	}
+	err = m.Close()
+	if err != nil {
+		return err
+	}
+	err = c.Quit()
+	if err != nil {
+		return err
+	}
 	return nil
 }
 
@@ -50,10 +103,16 @@ func (a *AlarmEmail) Parse(tk string) (bool, error) {
 		}
 
 	case TK_FROM:
+		if strings.TrimSpace(tk) == "" {
+			return false, fmt.Errorf("from address cannot be empty")
+		}
 		a.From = tk
 		a.state = TK_NONE
 
 	case TK_SMTP:
+		if strings.TrimSpace(tk) == "" {
+			return false, fmt.Errorf("smtp server cannot be empty")
+		}
 		a.SMTP = tk
 		a.state = TK_NONE
 
diff --git a/alrmrc b/alrmrc
index 1b426eb..eef47e3 100644
--- a/alrmrc
+++ b/alrmrc
@@ -3,7 +3,7 @@ set interval 30s
 alarm people email
 	to test1@localhost
 	to test2@localhost
-	smtp localhost
+	smtp localhost:25
 	from alrm@localhost
 
 monitor group webservers