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add CGI parsing

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This commit is contained in:
Steve 2020-02-24 13:15:01 -05:00
parent 58d983891e
commit e09110064b
3 changed files with 165 additions and 91 deletions
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150
gemini.go Normal file
View File

@ -0,0 +1,150 @@
package main
import (
"bufio"
"context"
"fmt"
"io/ioutil"
"log"
"mime"
"net/url"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"time"
)
// Yoinked from jetforce and go'ified
const (
STATUS_INPUT = 10
STATUS_SUCCESS = 20
STATUS_SUCCESS_END_OF_SESSION = 21
STATUS_REDIRECT_TEMPORARY = 30
STATUS_REDIRECT_PERMANENT = 31
STATUS_TEMPORARY_FAILURE = 40
STATUS_SERVER_UNAVAILABLE = 41
STATUS_CGI_ERROR = 42
STATUS_PROXY_ERROR = 43
STATUS_SLOW_DOWN = 44
STATUS_PERMANENT_FAILURE = 50
STATUS_NOT_FOUND = 51
STATUS_GONE = 52
STATUS_PROXY_REQUEST_REFUSED = 53
STATUS_BAD_REQUEST = 59
STATUS_CLIENT_CERTIFICATE_REQUIRED = 60
STATUS_TRANSIENT_CERTIFICATE_REQUESTED = 61
STATUS_AUTHORISED_CERTIFICATE_REQUIRED = 62
STATUS_CERTIFICATE_NOT_ACCEPTED = 63
STATUS_FUTURE_CERTIFICATE_REJECTED = 64
STATUS_EXPIRED_CERTIFICATE_REJECTED = 65
)
type Response struct {
Status int
Meta string
Body string
}
type GeminiConfig struct {
Hostname string
KeyFile string
CertFile string
RootDir string
CGIDir string
}
func (c *GeminiConfig) String() string {
return fmt.Sprintf("Gemini Config: %v Files:%v CGI:%v", c.Hostname, c.RootDir, c.CGIDir)
}
func generateFile(selector string) Response {
meta := mime.TypeByExtension(filepath.Ext(selector))
if meta == "" {
//assume plain UTF-8 text
meta = "text/gemini; charset=utf-8"
}
file, err := os.Open(selector)
if err != nil {
panic("Failed to read file")
}
defer file.Close()
buf, err := ioutil.ReadAll(file)
return Response{STATUS_SUCCESS, meta, string(buf)}
}
func generateDirectory(path string) Response {
var dirpage string
files, err := ioutil.ReadDir(path)
if err != nil {
log.Println(err)
return Response{STATUS_TEMPORARY_FAILURE, "Unable to show directory dirpage", ""}
}
dirpage = "# Directory Contents\r\n"
for _, file := range files {
// Don't list hidden files
if isNotWorldReadable(file) || strings.HasPrefix(file.Name(), ".") {
continue
}
if file.Name() == "index.gmi" || file.Name() == "index.gemini" {
//Found an index file, return that instead
return generateFile(path + file.Name())
} else {
dirpage += fmt.Sprintf("=> %s %s\r\n", file.Name(), file.Name())
}
}
return Response{STATUS_SUCCESS, "text/gemini", dirpage}
}
func generateCGI(selector *url.URL, c *conn) Response {
ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second) //make this customizable
defer cancel()
cmd := exec.CommandContext(ctx, selector.Path)
//build CGI environment
cmd.Env = []string{fmt.Sprintf("GEMINI_URL=%v", selector),
fmt.Sprintf("HOSTNAME=%v", selector.Hostname()),
fmt.Sprintf("PATH_INFO=%v", selector.Path),
fmt.Sprintf("QUERY_STRING=%v", selector.RawQuery),
fmt.Sprintf("REMOTE_ADDR=%v", c.C.RemoteAddr()),
fmt.Sprintf("REMOTE_HOST=%v", c.C.RemoteAddr()),
fmt.Sprintf("SERVER_NAME=%v", selector.Hostname()),
fmt.Sprintf("SERVER_PORT=%v", c.server.Port),
"SERVER_PROTOCOL=GEMINI",
"SERVER_SOFTWARE=secretshop/0.1.0",
}
cmdout, err := cmd.Output()
if ctx.Err() == context.DeadlineExceeded {
log.Printf("CGI %v timed out", selector)
return Response{STATUS_CGI_ERROR, "CGI process timed out", ""}
}
if err != nil {
log.Printf("Error running CGI process %v", selector)
return Response{STATUS_CGI_ERROR, "Error running CGI process", ""}
}
header, _, err := bufio.NewReader(strings.NewReader(string(cmdout))).ReadLine()
if err != nil {
log.Printf("Error running CGI process %v", selector)
return Response{STATUS_CGI_ERROR, "Error running CGI process", ""}
}
header_s := strings.Fields(string(header))
//make sure it has a valid status
status, err := strconv.Atoi(header_s[0])
if err != nil {
log.Printf("Error running CGI process %v", selector)
return Response{STATUS_CGI_ERROR, "Error running CGI process", ""}
}
if status < 0 || status > 69 {
log.Printf("CGI script returned bad status %v", selector)
return Response{STATUS_CGI_ERROR, "Error running CGI process", ""}
}
return Response{status, "", string(cmdout)}
}

51
proto.go
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@ -1,51 +0,0 @@
package main
import "fmt"
// Yoinked from jetforce and go'ified
const (
STATUS_INPUT = 10
STATUS_SUCCESS = 20
STATUS_SUCCESS_END_OF_SESSION = 21
STATUS_REDIRECT_TEMPORARY = 30
STATUS_REDIRECT_PERMANENT = 31
STATUS_TEMPORARY_FAILURE = 40
STATUS_SERVER_UNAVAILABLE = 41
STATUS_CGI_ERROR = 42
STATUS_PROXY_ERROR = 43
STATUS_SLOW_DOWN = 44
STATUS_PERMANENT_FAILURE = 50
STATUS_NOT_FOUND = 51
STATUS_GONE = 52
STATUS_PROXY_REQUEST_REFUSED = 53
STATUS_BAD_REQUEST = 59
STATUS_CLIENT_CERTIFICATE_REQUIRED = 60
STATUS_TRANSIENT_CERTIFICATE_REQUESTED = 61
STATUS_AUTHORISED_CERTIFICATE_REQUIRED = 62
STATUS_CERTIFICATE_NOT_ACCEPTED = 63
STATUS_FUTURE_CERTIFICATE_REJECTED = 64
STATUS_EXPIRED_CERTIFICATE_REJECTED = 65
)
type Response struct {
Status int
Meta string
Body string
}
type GeminiConfig struct {
Hostname string
KeyFile string
CertFile string
RootDir string
CGIDir string
}
func (c *GeminiConfig) String() string {
return fmt.Sprintf("Gemini Config: %v Files:%v CGI:%v", c.Hostname, c.RootDir, c.CGIDir)
}

55
server.go
View File

@ -6,7 +6,6 @@ import (
"crypto/rand"
"crypto/tls"
"fmt"
"io/ioutil"
"log"
"mime"
"net"
@ -40,8 +39,10 @@ var (
type Server struct {
Addr string // TCP address to listen on, ":gemini" if empty
Port string // TCP port
HostnameToRoot map[string]string //FQDN hostname to root folder
HostnameToCGI map[string]string //FQDN hostname to CGI folder
}
type conn struct {
@ -60,9 +61,10 @@ func (s *Server) newConn(rwc net.Conn) *conn {
}
func ListenAndServeTLS(port string, cps []GeminiConfig) error {
server := &Server{Addr: ":" + port, HostnameToRoot: make(map[string]string)}
server := &Server{Addr: ":" + port, Port: port, HostnameToRoot: make(map[string]string), HostnameToCGI: make(map[string]string)}
for _, c := range cps {
server.HostnameToRoot[c.Hostname] = c.RootDir
server.HostnameToCGI[c.Hostname] = c.CGIDir
}
return server.ListenAndServeTLS(cps)
}
@ -140,14 +142,14 @@ func (c *conn) serve(ctx context.Context) {
res = Response{STATUS_BAD_REQUEST, "URL contains non UTF8 charcaters", ""}
} else {
req = string(data[:count-2])
res = c.server.ParseRequest(req)
res = c.server.ParseRequest(req, c)
}
c.sendResponse(res)
log.Printf("%v requested %v; responded with %v %v", c.C.RemoteAddr(), req, res.Status, res.Meta)
c.C.Close()
}
func (s *Server) ParseRequest(req string) Response {
func (s *Server) ParseRequest(req string, c *conn) Response {
u, err := url.Parse(req)
if err != nil {
return Response{STATUS_BAD_REQUEST, "URL invalid", ""}
@ -187,46 +189,19 @@ func (s *Server) ParseRequest(req string) Response {
}
default:
// it's a file
return generateFile(selector)
}
}
func generateFile(selector string) Response {
meta := mime.TypeByExtension(filepath.Ext(selector))
if meta == "" {
//assume plain UTF-8 text
meta = "text/gemini; charset=utf-8"
}
file, err := os.Open(selector)
if err != nil {
panic("Failed to read file")
}
defer file.Close()
buf, err := ioutil.ReadAll(file)
return Response{STATUS_SUCCESS, meta, string(buf)}
}
func generateDirectory(path string) Response {
var dirpage string
files, err := ioutil.ReadDir(path)
if err != nil {
log.Println(err)
return Response{STATUS_TEMPORARY_FAILURE, "Unable to show directory dirpage", ""}
}
dirpage = "# Directory Contents\r\n"
for _, file := range files {
// Don't list hidden files
if isNotWorldReadable(file) || strings.HasPrefix(file.Name(), ".") {
continue
matches, err := filepath.Glob(s.HostnameToCGI[u.Hostname()] + "/*")
if err != nil {
log.Printf("%v: Couldn't search for CGI: %v", u.Hostname(), err)
return Response{STATUS_TEMPORARY_FAILURE, "Error finding file", ""}
}
if file.Name() == "index.gmi" || file.Name() == "index.gemini" {
//Found an index file, return that instead
return generateFile(path + file.Name())
if matches != nil && fi.Mode().Perm()&0111 == 0111 {
//CGI file found
return generateCGI(u, c)
} else {
dirpage += fmt.Sprintf("=> %s %s\r\n", file.Name(), file.Name())
//Normal file found
return generateFile(selector)
}
}
return Response{STATUS_SUCCESS, "text/gemini", dirpage}
}
func (c *conn) sendResponse(r Response) error {