482 lines
12 KiB
Go
482 lines
12 KiB
Go
package main
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import (
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"fmt"
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"log"
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"net"
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"strconv"
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"strings"
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"time"
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"github.com/racingmars/go3270"
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)
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const screenSeparator = "==============================================================================="
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func centerCol(text string) int {
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return max(0, (80-len(text))/2-1)
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}
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// send an ephemeral centered status/error notification overlay to the client
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func send3270Message(conn net.Conn, msg string, cp go3270.Codepage) {
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if conn == nil {
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return
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}
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col := centerCol(msg)
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screen := go3270.Screen{
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{Row: 11, Col: 0, Content: screenSeparator},
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{Row: 12, Col: col, Content: msg, Intense: true},
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{Row: 13, Col: 0, Content: screenSeparator},
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}
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values := make(map[string]string)
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_, _ = go3270.ShowScreenOpts(screen, values, conn, go3270.ScreenOpts{
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Codepage: cp,
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NoResponse: true,
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CursorRow: 12,
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CursorCol: col + 1,
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})
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}
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func promptLogin(conn net.Conn, devInfo go3270.DevInfo) (LoginCredentials, error) {
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title := GlobalConfig.Login.Title
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subtitle := GlobalConfig.Login.Subtitle
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instructions := GlobalConfig.Login.Instructions
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promptUser := GlobalConfig.Login.PromptUsername
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promptPass := GlobalConfig.Login.PromptPassword
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var cp go3270.Codepage
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if devInfo != nil {
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cp = devInfo.Codepage()
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}
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errMsg := ""
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for {
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screen := go3270.Screen{
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{Row: 0, Col: 0, Content: screenSeparator},
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{Row: 1, Col: centerCol(title), Content: title, Intense: true},
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{Row: 2, Col: centerCol(subtitle), Content: subtitle},
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{Row: 3, Col: 0, Content: screenSeparator},
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// Username row
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{Row: 7, Col: 10, Content: promptUser},
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{Row: 7, Col: 25, Name: "username", Write: true},
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{Row: 7, Col: 46, Content: ""},
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// Password row
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{Row: 9, Col: 10, Content: promptPass},
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{Row: 9, Col: 25, Name: "password", Write: true, Hidden: true},
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{Row: 9, Col: 46, Content: ""},
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// Footer
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{Row: 22, Col: 2, Content: instructions},
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}
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if errMsg != "" {
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screen = append(screen, go3270.Field{
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Row: 12,
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Col: centerCol(errMsg),
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Content: errMsg,
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Intense: true,
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})
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}
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values := make(map[string]string)
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resp, err := go3270.ShowScreenOpts(screen, values, conn, go3270.ScreenOpts{
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Codepage: cp,
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CursorRow: 7,
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CursorCol: 26,
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})
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if err != nil {
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return LoginCredentials{}, err
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}
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if resp.AID == go3270.AIDClear {
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errMsg = ""
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continue
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}
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user := strings.TrimSpace(resp.Values["username"])
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pass := strings.TrimSpace(resp.Values["password"])
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if pass == "" {
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errMsg = "Password is required."
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continue
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}
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if user == "" {
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user = "IBMUSER"
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}
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key := computeSessionKey(user, pass)
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return LoginCredentials{
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Username: user,
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Password: pass,
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SessionKey: key,
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}, nil
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}
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}
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func buildMainMenuScreen(s *UserMasterSession) go3270.Screen {
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menuTitle := ""
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menuFooter := ""
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promptSelect := ""
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if GlobalConfig != nil {
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menuTitle = GlobalConfig.Menu.Title
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menuFooter = GlobalConfig.Menu.Footer
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promptSelect = GlobalConfig.Menu.PromptSelect
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}
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total := len(ConfiguredSystem)
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s.Mu.Lock()
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username := s.Username
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displayTag := s.DisplayTag
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activeSlots := s.countActiveSlotsLocked()
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page, totalPages, startIdx, endIdx := menuPageBounds(s.MenuPage, total)
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renderedSlots := make([]slotRenderInfo, endIdx-startIdx)
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for idx := startIdx; idx < endIdx; idx++ {
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i := idx - startIdx
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status := "INACTIVE"
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var color go3270.Color
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hasNotice := false
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if idx < len(s.Slots) && s.Slots[idx] != nil {
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slot := s.Slots[idx]
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slot.Mu.Lock()
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if slot.IsHeld {
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status = "HELD"
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color = go3270.Red
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} else if slot.ScreenChanged {
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status = "NOTICE"
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hasNotice = true
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} else {
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status = "ACTIVE"
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color = go3270.Yellow
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}
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slot.Mu.Unlock()
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}
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renderedSlots[i] = slotRenderInfo{status: status, color: color, hasNotice: hasNotice}
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}
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s.Mu.Unlock()
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screen := go3270.Screen{
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{Row: 0, Col: 0, Content: screenSeparator},
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{Row: 1, Col: centerCol(menuTitle), Content: menuTitle, Intense: true},
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{Row: 2, Col: 2, Content: fmt.Sprintf("User: %-10s Session Tag: #%-8s", username, displayTag)},
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{Row: 2, Col: 58, Content: fmt.Sprintf("Active Sessions: %d", activeSlots)},
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{Row: 3, Col: 0, Content: screenSeparator},
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{Row: 5, Col: 2, Content: "CMD ID System Name Description Status", Intense: true},
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{Row: 6, Col: 2, Content: "--- ---- --------------- ------------------------------- -----------"},
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}
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row := 7
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for idx := startIdx; idx < endIdx; idx++ {
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sys := ConfiguredSystem[idx]
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info := renderedSlots[idx-startIdx]
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line := fmt.Sprintf("[%2d] %-15.15s %-31.31s %s", idx+1, sys.Name, sys.Description, info.status)
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screen = append(screen,
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go3270.Field{
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Row: row,
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Col: 2,
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Name: fmt.Sprintf("cmd_%d", idx+1),
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Write: true,
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},
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go3270.Field{
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Row: row,
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Col: 6,
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Content: line,
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Intense: info.hasNotice,
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Color: info.color,
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},
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)
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row++
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}
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screen = append(screen,
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go3270.Field{Row: 21, Col: 2, Content: promptSelect},
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go3270.Field{Row: 21, Col: 18, Name: "opt", Write: true},
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go3270.Field{Row: 21, Col: 78, Content: ""},
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go3270.Field{Row: 23, Col: 2, Content: menuFooter},
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)
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if totalPages > 1 {
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pageIndicator := fmt.Sprintf("Page %d of %d", page+1, totalPages)
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pageCol := max(0, 79-len(pageIndicator))
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screen = append(screen, go3270.Field{Row: 22, Col: pageCol, Content: pageIndicator})
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}
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return screen
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}
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func renderMainMenu(s *UserMasterSession, clientConn net.Conn) (go3270.Response, error) {
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screen := buildMainMenuScreen(s)
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values := make(map[string]string)
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cp := s.Codepage()
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return go3270.ShowScreenOpts(screen, values, clientConn, go3270.ScreenOpts{
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Codepage: cp,
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CursorRow: 21,
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CursorCol: 19,
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})
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}
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func runMenuLoop(s *UserMasterSession, clientConn net.Conn) {
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s.Mu.Lock()
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if s.ClientConn == clientConn {
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s.IsDisconnected = false
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}
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s.Mu.Unlock()
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for {
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s.Mu.Lock()
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if s.ClientConn != clientConn {
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s.Mu.Unlock()
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return
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}
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s.Mu.Unlock()
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resp, err := renderMainMenu(s, clientConn)
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if err != nil {
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s.Mu.Lock()
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username, displayTag := s.Username, s.DisplayTag
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if s.ClientConn == clientConn {
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s.IsDisconnected = true
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s.Mu.Unlock()
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log.Printf("[%s] '%s' Client disconnected while on system menu: %v", displayTag, username, err)
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cleanupSessionIfEmpty(s)
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} else {
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s.Mu.Unlock()
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log.Printf("[%s] '%s' Previous connection transferred to new terminal", displayTag, username)
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}
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return
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}
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switch resp.AID {
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case go3270.AIDPF3:
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disconnectClient(s, clientConn,
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"Disconnecting terminal... Session active in background.",
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"User pressed PF3 to disconnect. Preserving session.")
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return
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case go3270.AIDPF7, go3270.AIDPF19:
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s.Mu.Lock()
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page, _, _, _ := menuPageBounds(s.MenuPage, len(ConfiguredSystem))
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if page > 0 {
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s.MenuPage = page - 1
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} else {
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s.MenuPage = 0
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}
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s.Mu.Unlock()
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continue
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case go3270.AIDPF8, go3270.AIDPF20:
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s.Mu.Lock()
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page, totalPages, _, _ := menuPageBounds(s.MenuPage, len(ConfiguredSystem))
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if page < totalPages-1 {
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s.MenuPage = page + 1
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} else {
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s.MenuPage = page
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}
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s.Mu.Unlock()
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continue
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case go3270.AIDEnter:
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s.Mu.Lock()
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page, _, startIdx, endIdx := menuPageBounds(s.MenuPage, len(ConfiguredSystem))
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s.MenuPage = page
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username, displayTag := s.Username, s.DisplayTag
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isAdmin := s.IsAdmin
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s.Mu.Unlock()
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connectSlot := -1
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for idx := startIdx; idx < endIdx; idx++ {
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fieldName := fmt.Sprintf("cmd_%d", idx+1)
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cmdVal := strings.TrimSpace(resp.Values[fieldName])
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if cmdVal == "" {
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continue
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}
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switch strings.ToLower(cmdVal) {
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case "k":
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killSlot(s, idx)
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case "h", "r":
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hold := strings.EqualFold(cmdVal, "h")
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s.Mu.Lock()
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if idx < len(s.Slots) && s.Slots[idx] != nil {
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slot := s.Slots[idx]
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slot.Mu.Lock()
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slot.IsHeld = hold
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if hold {
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slot.ScreenChanged = false
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}
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slot.Mu.Unlock()
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if hold {
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log.Printf("[%s] '%s' Placed slot [%d] %s on HOLD", displayTag, username, idx+1, slot.System.Name)
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} else {
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log.Printf("[%s] '%s' RELEASED slot [%d] %s from hold", displayTag, username, idx+1, slot.System.Name)
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}
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}
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s.Mu.Unlock()
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case "b":
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log.Printf("[%s] '%s' CMD 'B' entered -> starting [%d] %s in background", displayTag, username, idx+1, ConfiguredSystem[idx].Name)
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ensureSlotConnected(s, idx, true, clientConn)
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default:
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if connectSlot == -1 {
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connectSlot = idx
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}
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}
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}
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if connectSlot >= 0 {
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log.Printf("[%s] '%s' CMD entered -> connecting to [%d] %s", displayTag, username, connectSlot+1, ConfiguredSystem[connectSlot].Name)
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} else {
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optStr := strings.TrimSpace(resp.Values["opt"])
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if optStr == "" {
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continue
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}
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parts := strings.Fields(optStr)
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cmd := strings.ToLower(parts[0])
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if isAdmin {
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switch cmd {
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case "bye":
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handleAdminBye(s)
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return
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case "killall":
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handleAdminKillAll(s)
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return
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case "kill":
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if len(parts) < 2 {
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send3270Message(clientConn, "Usage: kill <sessionid>", s.Codepage())
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time.Sleep(adminNoticeSleep)
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continue
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}
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if handleAdminKill(s, parts[1]) {
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return
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}
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continue
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}
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}
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selNum, err := strconv.Atoi(optStr)
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if err != nil || selNum < 1 || selNum > len(ConfiguredSystem) {
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log.Printf("[%s] '%s' Invalid option '%s' entered by user", displayTag, username, optStr)
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send3270Message(clientConn, fmt.Sprintf("Invalid option '%s'. Please enter a number between 1 and %d.", optStr, len(ConfiguredSystem)), s.Codepage())
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time.Sleep(adminNoticeSleep)
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continue
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}
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connectSlot = selNum - 1
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log.Printf("[%s] '%s' User selected option %d -> connecting to [%d] %s", displayTag, username, selNum, selNum, ConfiguredSystem[connectSlot].Name)
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}
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connectOrResumeSlot(s, connectSlot, clientConn)
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s.Mu.Lock()
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if s.ClientConn != clientConn || s.IsDisconnected {
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s.Mu.Unlock()
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return
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}
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s.Mu.Unlock()
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}
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}
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}
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func disconnectClient(s *UserMasterSession, clientConn net.Conn, msg, logMsg string) {
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s.Mu.Lock()
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if s.ClientConn == clientConn {
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s.IsDisconnected = true
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s.ActiveSlotIdx = -1
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username, displayTag := s.Username, s.DisplayTag
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cp := s.codepageLocked()
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s.Mu.Unlock()
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log.Printf("[%s] '%s' %s", displayTag, username, logMsg)
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send3270Message(clientConn, msg, cp)
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_ = clientConn.Close()
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cleanupSessionIfEmpty(s)
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} else {
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s.Mu.Unlock()
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}
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}
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func handleResumeSession(s *UserMasterSession, clientConn net.Conn) {
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s.Mu.Lock()
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if s.ClientConn == clientConn {
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s.IsDisconnected = false
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}
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username, displayTag := s.Username, s.DisplayTag
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activeSlots := s.countActiveSlotsLocked()
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cp := s.codepageLocked()
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s.Mu.Unlock()
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log.Printf("[%s] '%s' has active background sessions. Presenting resume", displayTag, username)
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menuTitle := ""
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if GlobalConfig != nil {
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menuTitle = GlobalConfig.Menu.Title
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}
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screen := go3270.Screen{
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{Row: 0, Col: 0, Content: screenSeparator},
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{Row: 1, Col: centerCol(menuTitle), Content: menuTitle, Intense: true},
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{Row: 2, Col: 2, Content: fmt.Sprintf("User: %-10s Session Tag: #%-8s", username, displayTag)},
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{Row: 2, Col: 58, Content: fmt.Sprintf("Active Sessions: %2d", activeSlots)},
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{Row: 3, Col: 0, Content: screenSeparator},
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{Row: 10, Col: 14, Content: fmt.Sprintf("Welcome back, %s!", username)},
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{Row: 22, Col: 2, Content: "[Enter] System Menu [PF3] Disconnect"},
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}
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values := make(map[string]string)
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resp, err := go3270.ShowScreenOpts(screen, values, clientConn, go3270.ScreenOpts{
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Codepage: cp,
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CursorRow: 22,
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CursorCol: 2,
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})
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if err != nil {
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s.Mu.Lock()
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if s.ClientConn == clientConn {
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s.IsDisconnected = true
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s.ActiveSlotIdx = -1
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s.Mu.Unlock()
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log.Printf("[%s] '%s' disconnected during resume prompt (%v)", displayTag, username, err)
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cleanupSessionIfEmpty(s)
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} else {
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s.Mu.Unlock()
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log.Printf("[%s] '%s' Connection transferred during resume prompt", displayTag, username)
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}
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return
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}
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if resp.AID == go3270.AIDPF3 {
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disconnectClient(s, clientConn, "Disconnecting... ", "PF3 disconnect during resume prompt")
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return
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}
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runMenuLoop(s, clientConn)
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}
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func menuPageBounds(menuPage, totalSystems int) (page, totalPages, startIdx, endIdx int) {
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totalPages = (totalSystems + 12) / 13
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if totalPages == 0 {
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totalPages = 1
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}
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if menuPage < 0 {
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page = 0
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} else if menuPage >= totalPages {
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page = totalPages - 1
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} else {
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page = menuPage
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}
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startIdx = page * 13
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endIdx = startIdx + 13
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if endIdx > totalSystems {
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endIdx = totalSystems
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}
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return page, totalPages, startIdx, endIdx
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}
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