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package main
import (
"bufio"
"fmt"
"os"
"strings"
)
// Error is a parse error recording the filename and line number.
type Error struct {
File string
Line int
Err error
}
func (e Error) Error() string {
if e.Line > 0 {
return fmt.Sprintf("%v:%v: %v", e.File, e.Line, e.Err)
} else {
return fmt.Sprintf("%v: %v", e.File, e.Err)
}
}
func parseConfigLine(line string) (key, val string) {
line = strings.TrimRight(line, "\t ")
keylen := strings.IndexAny(line, "\t =")
if keylen < 0 {
keylen = len(line)
}
variable := line[:keylen]
value := strings.TrimLeft(line[keylen:], "\t ")
if strings.HasPrefix(value, "=") {
value = strings.TrimLeft(value[1:], "\t ")
}
return variable, value
}
// ReadConfigFile opens and reads a Tinc configuration file, returning
// a map of settings. Since Tinc setting names are case-insensitive,
// the keys in the map are all lower-case.
func ReadConfigFile(fname string) (map[string][]string, error) {
config_tree := make(map[string][]string)
fp, err := os.Open(fname)
if err != nil {
return nil, Error{File: fname, Err: err}
}
buffer := bufio.NewScanner(fp)
lineno := 0
ignore := false
for buffer.Scan() {
line := buffer.Text()
lineno++
if len(line) == 0 || line[0] == '#' {
continue
}
if ignore {
if strings.HasPrefix(line, "-----END") {
ignore = false
}
continue
}
if strings.HasPrefix(line, "-----BEGIN") {
ignore = true
continue
}
variable, value := parseConfigLine(line)
if len(value) == 0 {
err = fmt.Errorf("No value for variable: %s", variable)
return nil, Error{File: fname, Line: lineno, Err: err}
}
variable = strings.ToLower(variable)
config_tree[variable] = append(config_tree[variable], value)
}
err = buffer.Err()
if err != nil {
return nil, Error{File: fname, Err: err}
}
return config_tree, nil
}
// GetAddresses inspects a tinc host-confing settings object and
// returns a list of public addresses in it.
func GetAddresses(cfg map[string][]string) []struct{ Node, Port string } {
var result []struct{ Node, Port string }
for _, node := range cfg["address"] {
var port string
space := strings.IndexByte(node, ' ')
if space < 0 {
if ports, portsOk := cfg["port"]; portsOk {
port = ports[0]
} else {
port = "655"
}
} else {
port = node[space+1:]
node = node[:space]
}
result = append(result, struct{ Node, Port string }{node, port})
}
return result
}
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