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angelnu
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package resolv | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "io" | ||
| "os" | ||
| "strings" | ||
| ) | ||
|
|
||
| // Resolver contains the data from resolv.conf | ||
| type Resolver struct { | ||
| Domains []string | ||
| Nameservers []string | ||
| Search []string | ||
| Sortlist []string | ||
| Options []ResolverOption | ||
| } | ||
|
|
||
| type ResolverOption struct { | ||
| Name string | ||
| Value *string | ||
| } | ||
|
|
||
| // Config reads /etc/resolv.conf and returns it as a Resolver | ||
| func Config() (Resolver, error) { | ||
| f, err := os.Open("/etc/resolv.conf") | ||
| if err != nil { | ||
| return Resolver{}, err | ||
| } | ||
| defer f.Close() | ||
| return parse(f) | ||
| } | ||
|
|
||
| func parse(f io.Reader) (Resolver, error) { | ||
| domains := make([]string, 0) | ||
| nameservers := make([]string, 0) | ||
| search := make([]string, 0) | ||
| options := make([]ResolverOption, 0) | ||
| sortlist := make([]string, 0) | ||
|
|
||
| scanner := bufio.NewScanner(f) | ||
| for scanner.Scan() { | ||
| line := scanner.Text() | ||
| if strings.HasPrefix(line, "#") { | ||
| continue | ||
| } | ||
|
|
||
| parts := strings.Split(line, " ") | ||
| if len(parts) < 2 { | ||
| continue | ||
| } | ||
|
|
||
| kind := parts[0] | ||
| rest := parts[1:] | ||
|
|
||
| switch kind { | ||
| case "domain": | ||
| for _, d := range rest { | ||
| d := strings.TrimSpace(d) | ||
| if d != "" { | ||
| domains = append(domains, d) | ||
| } | ||
| } | ||
| case "nameserver": | ||
| n := strings.Join(rest, "") | ||
| n = strings.TrimSpace(n) | ||
| nameservers = append(nameservers, n) | ||
| case "search": | ||
| for _, s := range rest { | ||
| s := strings.TrimSpace(s) | ||
| if s != "" { | ||
| search = append(search, s) | ||
| } | ||
| } | ||
| case "options": | ||
| for _, s := range rest { | ||
| s := strings.TrimSpace(s) | ||
| s_parts := strings.SplitN(line, ":", 2) | ||
|
|
||
| option := ResolverOption{ | ||
| Name: s_parts[0], | ||
| } | ||
| if len(s_parts) == 2 { | ||
| option.Value = &s_parts[1] | ||
| } | ||
|
|
||
| if s != "" { | ||
| options = append(options, option) | ||
| } | ||
| } | ||
| case "sortlist": | ||
| for _, s := range rest { | ||
| s := strings.TrimSpace(s) | ||
| if s != "" { | ||
| sortlist = append(sortlist, s) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return Resolver{ | ||
| Domains: domains, | ||
| Nameservers: nameservers, | ||
| Search: search, | ||
| Options: options, | ||
| Sortlist: sortlist, | ||
| }, nil | ||
| } |