dashboard/app/reporting_email.go - third_party/syzkaller - Git at Google

 // Copyright 2017 syzkaller project authors. All rights reserved.
 // Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.

 package dash

 import (
 	"bytes"
 	"encoding/json"
 	"fmt"
 	"net/http"
 	"net/mail"
 	"strings"
 	"text/template"

 	"github.com/google/syzkaller/dashboard/dashapi"
 	"github.com/google/syzkaller/pkg/email"
 	"golang.org/x/net/context"
 	"google.golang.org/appengine"
 	"google.golang.org/appengine/log"
 	aemail "google.golang.org/appengine/mail"
 )

 // Email reporting interface.

 func init() {
 	http.HandleFunc("/email_poll", handleEmailPoll)
 	http.HandleFunc("/_ah/mail/", handleIncomingMail)

 	mailingLists = make(map[string]bool)
 	for _, cfg := range config.Namespaces {
 		for _, reporting := range cfg.Reporting {
 			if cfg, ok := reporting.Config.(*EmailConfig); ok {
 				mailingLists[email.CanonicalEmail(cfg.Email)] = true
 			}
 		}
 	}
 }

 const emailType = "email"

 var mailingLists map[string]bool

 type EmailConfig struct {
 	Email           string
 	Moderation      bool
 	MailMaintainers bool
 }

 func (cfg *EmailConfig) Type() string {
 	return emailType
 }

 func (cfg *EmailConfig) NeedMaintainers() bool {
 	return cfg.MailMaintainers
 }

 func (cfg *EmailConfig) Validate() error {
 	if _, err := mail.ParseAddress(cfg.Email); err != nil {
 		return fmt.Errorf("bad email address %q: %v", cfg.Email, err)
 	}
 	if cfg.Moderation && cfg.MailMaintainers {
 		return fmt.Errorf("both Moderation and MailMaintainers set")
 	}
 	return nil
 }

 // handleEmailPoll is called by cron and sends emails for new bugs, if any.
 func handleEmailPoll(w http.ResponseWriter, r *http.Request) {
 	c := appengine.NewContext(r)
 	if err := emailPollBugs(c); err != nil {
 		log.Errorf(c, "bug poll failed: %v", err)
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
 	if err := emailPollJobs(c); err != nil {
 		log.Errorf(c, "job poll failed: %v", err)
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
 	w.Write([]byte("OK"))
 }

 func emailPollBugs(c context.Context) error {
 	reports := reportingPoll(c, emailType)
 	for _, rep := range reports {
 		if err := emailReport(c, rep, "mail_bug.txt"); err != nil {
 			log.Errorf(c, "failed to report bug: %v", err)
 			continue
 		}
 		cmd := &dashapi.BugUpdate{
 			ID:         rep.ID,
 			Status:     dashapi.BugStatusOpen,
 			ReproLevel: dashapi.ReproLevelNone,
 		}
 		if len(rep.ReproC) != 0 {
 			cmd.ReproLevel = dashapi.ReproLevelC
 		} else if len(rep.ReproSyz) != 0 {
 			cmd.ReproLevel = dashapi.ReproLevelSyz
 		}
 		ok, reason, err := incomingCommand(c, cmd)
 		if !ok || err != nil {
 			log.Errorf(c, "failed to update reported bug: ok=%v reason=%v err=%v", ok, reason, err)
 		}
 	}
 	return nil
 }

 func emailPollJobs(c context.Context) error {
 	jobs, err := pollCompletedJobs(c, emailType)
 	if err != nil {
 		return err
 	}
 	for _, job := range jobs {
 		if err := emailReport(c, job, "mail_test_result.txt"); err != nil {
 			log.Errorf(c, "failed to report job: %v", err)
 			continue
 		}
 		if err := jobReported(c, job.JobID); err != nil {
 			log.Errorf(c, "failed to mark job reported: %v", err)
 			continue
 		}
 	}
 	return nil
 }

 func emailReport(c context.Context, rep *dashapi.BugReport, templ string) error {
 	cfg := new(EmailConfig)
 	if err := json.Unmarshal(rep.Config, cfg); err != nil {
 		return fmt.Errorf("failed to unmarshal email config: %v", err)
 	}
 	to := []string{cfg.Email}
 	if cfg.MailMaintainers {
 		to = append(to, rep.Maintainers...)
 	}
 	to = email.MergeEmailLists(to, rep.CC)
 	var attachments []aemail.Attachment
 	if len(rep.KernelConfig) != 0 {
 		attachments = append(attachments, aemail.Attachment{
 			Name: "config.txt",
 			Data: rep.KernelConfig,
 		})
 	}
 	if len(rep.Patch) != 0 {
 		attachments = append(attachments, aemail.Attachment{
 			Name: "patch.txt",
 			Data: rep.Patch,
 		})
 	}
 	if len(rep.Log) != 0 {
 		attachments = append(attachments, aemail.Attachment{
 			Name: "raw.log",
 			Data: rep.Log,
 		})
 	}
 	if len(rep.ReproSyz) != 0 {
 		attachments = append(attachments, aemail.Attachment{
 			Name: "repro.txt",
 			Data: rep.ReproSyz,
 		})
 	}
 	if len(rep.ReproC) != 0 {
 		attachments = append(attachments, aemail.Attachment{
 			Name: "repro.c",
 			Data: rep.ReproC,
 		})
 	}
 	// Build error output and failing VM boot log can be way too long to inline.
 	const maxInlineError = 16 << 10
 	errorText, errorTruncated := rep.Error, false
 	if len(errorText) > maxInlineError {
 		errorTruncated = true
 		attachments = append(attachments, aemail.Attachment{
 			Name: "error.txt",
 			Data: errorText,
 		})
 		errorText = errorText[len(errorText)-maxInlineError:]
 	}
 	from, err := email.AddAddrContext(fromAddr(c), rep.ID)
 	if err != nil {
 		return err
 	}
 	// Data passed to the template.
 	type BugReportData struct {
 		First           bool
 		Moderation      bool
 		Maintainers     []string
 		CompilerID      string
 		KernelRepo      string
 		KernelBranch    string
 		KernelCommit    string
 		CrashTitle      string
 		Report          []byte
 		Error           []byte
 		ErrorTruncated  bool
 		HasLog          bool
 		HasKernelConfig bool
 		ReproSyz        bool
 		ReproC          bool
 	}
 	data := &BugReportData{
 		First:           rep.First,
 		Moderation:      cfg.Moderation,
 		Maintainers:     rep.Maintainers,
 		CompilerID:      rep.CompilerID,
 		KernelRepo:      rep.KernelRepo,
 		KernelBranch:    rep.KernelBranch,
 		KernelCommit:    rep.KernelCommit,
 		CrashTitle:      rep.CrashTitle,
 		Report:          rep.Report,
 		Error:           errorText,
 		ErrorTruncated:  errorTruncated,
 		HasLog:          len(rep.Log) != 0,
 		HasKernelConfig: len(rep.KernelConfig) != 0,
 		ReproSyz:        len(rep.ReproSyz) != 0,
 		ReproC:          len(rep.ReproC) != 0,
 	}
 	log.Infof(c, "sending email %q to %q", rep.Title, to)
 	err = sendMailTemplate(c, rep.Title, from, to, rep.ExtID, attachments, templ, data)
 	if err != nil {
 		return err
 	}
 	return nil
 }

 // handleIncomingMail is the entry point for incoming emails.
 func handleIncomingMail(w http.ResponseWriter, r *http.Request) {
 	c := appengine.NewContext(r)
 	if err := incomingMail(c, r); err != nil {
 		log.Errorf(c, "%v", err)
 	}
 }

 func incomingMail(c context.Context, r *http.Request) error {
 	msg, err := email.Parse(r.Body, fromAddr(c))
 	if err != nil {
 		return err
 	}
 	log.Infof(c, "received email: subject %q, from %q, cc %q, msg %q, bug %q, cmd %q, link %q",
 		msg.Subject, msg.From, msg.Cc, msg.MessageID, msg.BugID, msg.Command, msg.Link)
 	bug, bugReporting, reporting := loadBugInfo(c, msg)
 	if bug == nil {
 		return nil // error was already logged
 	}
 	_ = bugReporting
 	emailConfig := reporting.Config.(*EmailConfig)
 	mailingList := email.CanonicalEmail(emailConfig.Email)
 	fromMailingList := email.CanonicalEmail(msg.From) == mailingList
 	mailingListInCC := checkMailingListInCC(c, msg, mailingList)
 	// A mailing list can send us a duplicate email, to not process/reply
 	// to such duplicate emails, we ignore emails coming from our mailing lists.
 	if msg.Command == "test:" {
 		if fromMailingList {
 			if msg.Link != "" {
 				if err := updateTestJob(c, msg.MessageID, msg.Link); err != nil {
 					log.Errorf(c, "failed to update job: %v", err)
 				}
 			}
 			return nil
 		}
 		args := strings.Split(msg.CommandArgs, " ")
 		if len(args) != 2 {
 			return replyTo(c, msg, fmt.Sprintf("want 2 args (repo, branch), got %v",
 				len(args)), nil)
 		}
 		reply := handleTestRequest(c, msg.BugID, email.CanonicalEmail(msg.From),
 			msg.MessageID, msg.Patch, args[0], args[1])
 		if reply != "" {
 			return replyTo(c, msg, reply, nil)
 		}
 		if !mailingListInCC {
 			warnMailingListInCC(c, msg, mailingList)
 		}
 		return nil
 	}
 	if fromMailingList && msg.Command != "" {
 		log.Infof(c, "duplicate email from mailing list, ignoring")
 		return nil
 	}
 	cmd := &dashapi.BugUpdate{
 		ID:    msg.BugID,
 		ExtID: msg.MessageID,
 		Link:  msg.Link,
 		CC:    msg.Cc,
 	}
 	switch msg.Command {
 	case "":
 		cmd.Status = dashapi.BugStatusUpdate
 	case "upstream":
 		cmd.Status = dashapi.BugStatusUpstream
 	case "invalid":
 		cmd.Status = dashapi.BugStatusInvalid
 	case "fix:":
 		if msg.CommandArgs == "" {
 			return replyTo(c, msg, fmt.Sprintf("no commit title"), nil)
 		}
 		cmd.Status = dashapi.BugStatusOpen
 		cmd.FixCommits = []string{msg.CommandArgs}
 	case "dup:":
 		if msg.CommandArgs == "" {
 			return replyTo(c, msg, fmt.Sprintf("no dup title"), nil)
 		}
 		cmd.Status = dashapi.BugStatusDup
 		cmd.DupOf = msg.CommandArgs
 	default:
 		return replyTo(c, msg, fmt.Sprintf("unknown command %q", msg.Command), nil)
 	}
 	ok, reply, err := incomingCommand(c, cmd)
 	if err != nil {
 		return nil // the error was already logged
 	}
 	if !ok && reply != "" {
 		return replyTo(c, msg, reply, nil)
 	}
 	if !mailingListInCC && msg.Command != "" {
 		warnMailingListInCC(c, msg, mailingList)
 	}
 	return nil
 }

 func loadBugInfo(c context.Context, msg *email.Email) (bug *Bug, bugReporting *BugReporting, reporting *Reporting) {
 	if msg.BugID == "" {
 		log.Warningf(c, "no bug ID (%q)", msg.Subject)
 		return nil, nil, nil
 	}
 	bug, _, err := findBugByReportingID(c, msg.BugID)
 	if err != nil {
 		log.Errorf(c, "can't find bug: %v", err)
 		replyTo(c, msg, "Can't find the corresponding bug.", nil)
 		return nil, nil, nil
 	}
 	bugReporting, _ = bugReportingByID(bug, msg.BugID)
 	if bugReporting == nil {
 		log.Errorf(c, "can't find bug reporting: %v", err)
 		replyTo(c, msg, "Can't find the corresponding bug.", nil)
 		return nil, nil, nil
 	}
 	reporting = config.Namespaces[bug.Namespace].ReportingByName(bugReporting.Name)
 	if reporting == nil {
 		log.Errorf(c, "can't find reporting for this bug: namespace=%q reporting=%q",
 			bug.Namespace, bugReporting.Name)
 		return nil, nil, nil
 	}
 	if reporting.Config.Type() != emailType {
 		log.Errorf(c, "reporting is not email: namespace=%q reporting=%q config=%q",
 			bug.Namespace, bugReporting.Name, reporting.Config.Type())
 		return nil, nil, nil
 	}
 	return bug, bugReporting, reporting
 }

 func checkMailingListInCC(c context.Context, msg *email.Email, mailingList string) bool {
 	if email.CanonicalEmail(msg.From) == mailingList {
 		return true
 	}
 	for _, cc := range msg.Cc {
 		if email.CanonicalEmail(cc) == mailingList {
 			return true
 		}
 	}
 	msg.Cc = append(msg.Cc, mailingList)
 	return false
 }

 func warnMailingListInCC(c context.Context, msg *email.Email, mailingList string) {
 	reply := fmt.Sprintf("Your '%v' command is accepted, but please keep %v mailing list"+
 		" in CC next time. It serves as a history of what happened with each bug report."+
 		" Thank you.",
 		msg.Command, mailingList)
 	if err := replyTo(c, msg, reply, nil); err != nil {
 		log.Errorf(c, "failed to send email reply: %v", err)
 	}
 }

 var mailTemplates = template.Must(template.New("").ParseGlob("mail_*.txt"))

 func sendMailTemplate(c context.Context, subject, from string, to []string, replyTo string,
 	attachments []aemail.Attachment, template string, data interface{}) error {
 	body := new(bytes.Buffer)
 	if err := mailTemplates.ExecuteTemplate(body, template, data); err != nil {
 		return fmt.Errorf("failed to execute %v template: %v", template, err)
 	}
 	msg := &aemail.Message{
 		Sender:      from,
 		To:          to,
 		Subject:     subject,
 		Body:        body.String(),
 		Attachments: attachments,
 	}
 	if replyTo != "" {
 		msg.Headers = mail.Header{"In-Reply-To": []string{replyTo}}
 	}
 	return sendEmail(c, msg)
 }

 func replyTo(c context.Context, msg *email.Email, reply string, attachment *aemail.Attachment) error {
 	var attachments []aemail.Attachment
 	if attachment != nil {
 		attachments = append(attachments, *attachment)
 	}
 	from, err := email.AddAddrContext(fromAddr(c), msg.BugID)
 	if err != nil {
 		return err
 	}
 	log.Infof(c, "sending reply: to=%q cc=%q subject=%q reply=%q",
 		msg.From, msg.Cc, msg.Subject, reply)
 	replyMsg := &aemail.Message{
 		Sender:      from,
 		To:          []string{msg.From},
 		Cc:          msg.Cc,
 		Subject:     msg.Subject,
 		Body:        email.FormReply(msg.Body, reply),
 		Attachments: attachments,
 		Headers:     mail.Header{"In-Reply-To": []string{msg.MessageID}},
 	}
 	return sendEmail(c, replyMsg)
 }

 // Sends email, can be stubbed for testing.
 var sendEmail = func(c context.Context, msg *aemail.Message) error {
 	if err := aemail.Send(c, msg); err != nil {
 		return fmt.Errorf("failed to send email: %v", err)
 	}
 	return nil
 }

 func fromAddr(c context.Context) string {
 	return fmt.Sprintf("\"syzbot\" <bot@%v.appspotmail.com>", appengine.AppID(c))
 }
	// Copyright 2017 syzkaller project authors. All rights reserved.
	// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.

	package dash

	import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"net/mail"
	"strings"
	"text/template"

	"github.com/google/syzkaller/dashboard/dashapi"
	"github.com/google/syzkaller/pkg/email"
	"golang.org/x/net/context"
	"google.golang.org/appengine"
	"google.golang.org/appengine/log"
	aemail "google.golang.org/appengine/mail"
	)

	// Email reporting interface.

	func init() {
	http.HandleFunc("/email_poll", handleEmailPoll)
	http.HandleFunc("/_ah/mail/", handleIncomingMail)

	mailingLists = make(map[string]bool)
	for _, cfg := range config.Namespaces {
	for _, reporting := range cfg.Reporting {
	if cfg, ok := reporting.Config.(*EmailConfig); ok {
	mailingLists[email.CanonicalEmail(cfg.Email)] = true
	}
	}
	}
	}

	const emailType = "email"

	var mailingLists map[string]bool

	type EmailConfig struct {
	Email string
	Moderation bool
	MailMaintainers bool
	}

	func (cfg *EmailConfig) Type() string {
	return emailType
	}

	func (cfg *EmailConfig) NeedMaintainers() bool {
	return cfg.MailMaintainers
	}

	func (cfg *EmailConfig) Validate() error {
	if _, err := mail.ParseAddress(cfg.Email); err != nil {
	return fmt.Errorf("bad email address %q: %v", cfg.Email, err)
	}
	if cfg.Moderation && cfg.MailMaintainers {
	return fmt.Errorf("both Moderation and MailMaintainers set")
	}
	return nil
	}

	// handleEmailPoll is called by cron and sends emails for new bugs, if any.
	func handleEmailPoll(w http.ResponseWriter, r *http.Request) {
	c := appengine.NewContext(r)
	if err := emailPollBugs(c); err != nil {
	log.Errorf(c, "bug poll failed: %v", err)
	http.Error(w, err.Error(), http.StatusInternalServerError)
	return
	}
	if err := emailPollJobs(c); err != nil {
	log.Errorf(c, "job poll failed: %v", err)
	http.Error(w, err.Error(), http.StatusInternalServerError)
	return
	}
	w.Write([]byte("OK"))
	}

	func emailPollBugs(c context.Context) error {
	reports := reportingPoll(c, emailType)
	for _, rep := range reports {
	if err := emailReport(c, rep, "mail_bug.txt"); err != nil {
	log.Errorf(c, "failed to report bug: %v", err)
	continue
	}
	cmd := &dashapi.BugUpdate{
	ID: rep.ID,
	Status: dashapi.BugStatusOpen,
	ReproLevel: dashapi.ReproLevelNone,
	}
	if len(rep.ReproC) != 0 {
	cmd.ReproLevel = dashapi.ReproLevelC
	} else if len(rep.ReproSyz) != 0 {
	cmd.ReproLevel = dashapi.ReproLevelSyz
	}
	ok, reason, err := incomingCommand(c, cmd)
	if !ok \|\| err != nil {
	log.Errorf(c, "failed to update reported bug: ok=%v reason=%v err=%v", ok, reason, err)
	}
	}
	return nil
	}

	func emailPollJobs(c context.Context) error {
	jobs, err := pollCompletedJobs(c, emailType)
	if err != nil {
	return err
	}
	for _, job := range jobs {
	if err := emailReport(c, job, "mail_test_result.txt"); err != nil {
	log.Errorf(c, "failed to report job: %v", err)
	continue
	}
	if err := jobReported(c, job.JobID); err != nil {
	log.Errorf(c, "failed to mark job reported: %v", err)
	continue
	}
	}
	return nil
	}

	func emailReport(c context.Context, rep *dashapi.BugReport, templ string) error {
	cfg := new(EmailConfig)
	if err := json.Unmarshal(rep.Config, cfg); err != nil {
	return fmt.Errorf("failed to unmarshal email config: %v", err)
	}
	to := []string{cfg.Email}
	if cfg.MailMaintainers {
	to = append(to, rep.Maintainers...)
	}
	to = email.MergeEmailLists(to, rep.CC)
	var attachments []aemail.Attachment
	if len(rep.KernelConfig) != 0 {
	attachments = append(attachments, aemail.Attachment{
	Name: "config.txt",
	Data: rep.KernelConfig,
	})
	}
	if len(rep.Patch) != 0 {
	attachments = append(attachments, aemail.Attachment{
	Name: "patch.txt",
	Data: rep.Patch,
	})
	}
	if len(rep.Log) != 0 {
	attachments = append(attachments, aemail.Attachment{
	Name: "raw.log",
	Data: rep.Log,
	})
	}
	if len(rep.ReproSyz) != 0 {
	attachments = append(attachments, aemail.Attachment{
	Name: "repro.txt",
	Data: rep.ReproSyz,
	})
	}
	if len(rep.ReproC) != 0 {
	attachments = append(attachments, aemail.Attachment{
	Name: "repro.c",
	Data: rep.ReproC,
	})
	}
	// Build error output and failing VM boot log can be way too long to inline.
	const maxInlineError = 16 << 10
	errorText, errorTruncated := rep.Error, false
	if len(errorText) > maxInlineError {
	errorTruncated = true
	attachments = append(attachments, aemail.Attachment{
	Name: "error.txt",
	Data: errorText,
	})
	errorText = errorText[len(errorText)-maxInlineError:]
	}
	from, err := email.AddAddrContext(fromAddr(c), rep.ID)
	if err != nil {
	return err
	}
	// Data passed to the template.
	type BugReportData struct {
	First bool
	Moderation bool
	Maintainers []string
	CompilerID string
	KernelRepo string
	KernelBranch string
	KernelCommit string
	CrashTitle string
	Report []byte
	Error []byte
	ErrorTruncated bool
	HasLog bool
	HasKernelConfig bool
	ReproSyz bool
	ReproC bool
	}
	data := &BugReportData{
	First: rep.First,
	Moderation: cfg.Moderation,
	Maintainers: rep.Maintainers,
	CompilerID: rep.CompilerID,
	KernelRepo: rep.KernelRepo,
	KernelBranch: rep.KernelBranch,
	KernelCommit: rep.KernelCommit,
	CrashTitle: rep.CrashTitle,
	Report: rep.Report,
	Error: errorText,
	ErrorTruncated: errorTruncated,
	HasLog: len(rep.Log) != 0,
	HasKernelConfig: len(rep.KernelConfig) != 0,
	ReproSyz: len(rep.ReproSyz) != 0,
	ReproC: len(rep.ReproC) != 0,
	}
	log.Infof(c, "sending email %q to %q", rep.Title, to)
	err = sendMailTemplate(c, rep.Title, from, to, rep.ExtID, attachments, templ, data)
	if err != nil {
	return err
	}
	return nil
	}

	// handleIncomingMail is the entry point for incoming emails.
	func handleIncomingMail(w http.ResponseWriter, r *http.Request) {
	c := appengine.NewContext(r)
	if err := incomingMail(c, r); err != nil {
	log.Errorf(c, "%v", err)
	}
	}

	func incomingMail(c context.Context, r *http.Request) error {
	msg, err := email.Parse(r.Body, fromAddr(c))
	if err != nil {
	return err
	}
	log.Infof(c, "received email: subject %q, from %q, cc %q, msg %q, bug %q, cmd %q, link %q",
	msg.Subject, msg.From, msg.Cc, msg.MessageID, msg.BugID, msg.Command, msg.Link)
	bug, bugReporting, reporting := loadBugInfo(c, msg)
	if bug == nil {
	return nil // error was already logged
	}
	_ = bugReporting
	emailConfig := reporting.Config.(*EmailConfig)
	mailingList := email.CanonicalEmail(emailConfig.Email)
	fromMailingList := email.CanonicalEmail(msg.From) == mailingList
	mailingListInCC := checkMailingListInCC(c, msg, mailingList)
	// A mailing list can send us a duplicate email, to not process/reply
	// to such duplicate emails, we ignore emails coming from our mailing lists.
	if msg.Command == "test:" {
	if fromMailingList {
	if msg.Link != "" {
	if err := updateTestJob(c, msg.MessageID, msg.Link); err != nil {
	log.Errorf(c, "failed to update job: %v", err)
	}
	}
	return nil
	}
	args := strings.Split(msg.CommandArgs, " ")
	if len(args) != 2 {
	return replyTo(c, msg, fmt.Sprintf("want 2 args (repo, branch), got %v",
	len(args)), nil)
	}
	reply := handleTestRequest(c, msg.BugID, email.CanonicalEmail(msg.From),
	msg.MessageID, msg.Patch, args[0], args[1])
	if reply != "" {
	return replyTo(c, msg, reply, nil)
	}
	if !mailingListInCC {
	warnMailingListInCC(c, msg, mailingList)
	}
	return nil
	}
	if fromMailingList && msg.Command != "" {
	log.Infof(c, "duplicate email from mailing list, ignoring")
	return nil
	}
	cmd := &dashapi.BugUpdate{
	ID: msg.BugID,
	ExtID: msg.MessageID,
	Link: msg.Link,
	CC: msg.Cc,
	}
	switch msg.Command {
	case "":
	cmd.Status = dashapi.BugStatusUpdate
	case "upstream":
	cmd.Status = dashapi.BugStatusUpstream
	case "invalid":
	cmd.Status = dashapi.BugStatusInvalid
	case "fix:":
	if msg.CommandArgs == "" {
	return replyTo(c, msg, fmt.Sprintf("no commit title"), nil)
	}
	cmd.Status = dashapi.BugStatusOpen
	cmd.FixCommits = []string{msg.CommandArgs}
	case "dup:":
	if msg.CommandArgs == "" {
	return replyTo(c, msg, fmt.Sprintf("no dup title"), nil)
	}
	cmd.Status = dashapi.BugStatusDup
	cmd.DupOf = msg.CommandArgs
	default:
	return replyTo(c, msg, fmt.Sprintf("unknown command %q", msg.Command), nil)
	}
	ok, reply, err := incomingCommand(c, cmd)
	if err != nil {
	return nil // the error was already logged
	}
	if !ok && reply != "" {
	return replyTo(c, msg, reply, nil)
	}
	if !mailingListInCC && msg.Command != "" {
	warnMailingListInCC(c, msg, mailingList)
	}
	return nil
	}

	func loadBugInfo(c context.Context, msg email.Email) (bug Bug, bugReporting BugReporting, reporting Reporting) {
	if msg.BugID == "" {
	log.Warningf(c, "no bug ID (%q)", msg.Subject)
	return nil, nil, nil
	}
	bug, _, err := findBugByReportingID(c, msg.BugID)
	if err != nil {
	log.Errorf(c, "can't find bug: %v", err)
	replyTo(c, msg, "Can't find the corresponding bug.", nil)
	return nil, nil, nil
	}
	bugReporting, _ = bugReportingByID(bug, msg.BugID)
	if bugReporting == nil {
	log.Errorf(c, "can't find bug reporting: %v", err)
	replyTo(c, msg, "Can't find the corresponding bug.", nil)
	return nil, nil, nil
	}
	reporting = config.Namespaces[bug.Namespace].ReportingByName(bugReporting.Name)
	if reporting == nil {
	log.Errorf(c, "can't find reporting for this bug: namespace=%q reporting=%q",
	bug.Namespace, bugReporting.Name)
	return nil, nil, nil
	}
	if reporting.Config.Type() != emailType {
	log.Errorf(c, "reporting is not email: namespace=%q reporting=%q config=%q",
	bug.Namespace, bugReporting.Name, reporting.Config.Type())
	return nil, nil, nil
	}
	return bug, bugReporting, reporting
	}

	func checkMailingListInCC(c context.Context, msg *email.Email, mailingList string) bool {
	if email.CanonicalEmail(msg.From) == mailingList {
	return true
	}
	for _, cc := range msg.Cc {
	if email.CanonicalEmail(cc) == mailingList {
	return true
	}
	}
	msg.Cc = append(msg.Cc, mailingList)
	return false
	}

	func warnMailingListInCC(c context.Context, msg *email.Email, mailingList string) {
	reply := fmt.Sprintf("Your '%v' command is accepted, but please keep %v mailing list"+
	" in CC next time. It serves as a history of what happened with each bug report."+
	" Thank you.",
	msg.Command, mailingList)
	if err := replyTo(c, msg, reply, nil); err != nil {
	log.Errorf(c, "failed to send email reply: %v", err)
	}
	}

	var mailTemplates = template.Must(template.New("").ParseGlob("mail_*.txt"))

	func sendMailTemplate(c context.Context, subject, from string, to []string, replyTo string,
	attachments []aemail.Attachment, template string, data interface{}) error {
	body := new(bytes.Buffer)
	if err := mailTemplates.ExecuteTemplate(body, template, data); err != nil {
	return fmt.Errorf("failed to execute %v template: %v", template, err)
	}
	msg := &aemail.Message{
	Sender: from,
	To: to,
	Subject: subject,
	Body: body.String(),
	Attachments: attachments,
	}
	if replyTo != "" {
	msg.Headers = mail.Header{"In-Reply-To": []string{replyTo}}
	}
	return sendEmail(c, msg)
	}

	func replyTo(c context.Context, msg email.Email, reply string, attachment aemail.Attachment) error {
	var attachments []aemail.Attachment
	if attachment != nil {
	attachments = append(attachments, *attachment)
	}
	from, err := email.AddAddrContext(fromAddr(c), msg.BugID)
	if err != nil {
	return err
	}
	log.Infof(c, "sending reply: to=%q cc=%q subject=%q reply=%q",
	msg.From, msg.Cc, msg.Subject, reply)
	replyMsg := &aemail.Message{
	Sender: from,
	To: []string{msg.From},
	Cc: msg.Cc,
	Subject: msg.Subject,
	Body: email.FormReply(msg.Body, reply),
	Attachments: attachments,
	Headers: mail.Header{"In-Reply-To": []string{msg.MessageID}},
	}
	return sendEmail(c, replyMsg)
	}

	// Sends email, can be stubbed for testing.
	var sendEmail = func(c context.Context, msg *aemail.Message) error {
	if err := aemail.Send(c, msg); err != nil {
	return fmt.Errorf("failed to send email: %v", err)
	}
	return nil
	}

	func fromAddr(c context.Context) string {
	return fmt.Sprintf("\"syzbot\" <bot@%v.appspotmail.com>", appengine.AppID(c))
	}