96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
package birdfmt
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import (
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"fmt"
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"strings"
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)
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// Directory and fragment file names for EvoBGP-generated includes (relative to bird.conf).
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const (
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DirBirdD = "bird.d"
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FragmentPrefixesV4 = "evobgp_prefixes_v4.conf"
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FragmentPrefixesV6 = "evobgp_prefixes_v6.conf"
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FragmentFiltersV4 = "evobgp_filters_v4.conf"
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FragmentFiltersV6 = "evobgp_filters_v6.conf"
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FragmentPeers = "evobgp_peers.conf"
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)
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// FragmentIncludePath returns a POSIX include path such as bird.d/evobgp_prefixes_v4.conf.
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func FragmentIncludePath(fragmentBaseName string) string {
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if fragmentBaseName == "" {
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return DirBirdD + "/"
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}
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return DirBirdD + "/" + fragmentBaseName
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}
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// StandardIncludeFragments is the recommended order: filters before peers that reference them.
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func StandardIncludeFragments() []string {
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return []string{
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FragmentIncludePath(FragmentFiltersV4),
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FragmentIncludePath(FragmentFiltersV6),
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FragmentIncludePath(FragmentPrefixesV4),
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FragmentIncludePath(FragmentPrefixesV6),
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FragmentIncludePath(FragmentPeers),
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}
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}
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// MainBirdConfOptions describes the top-level bird.conf skeleton EvoBGP expects beside bird.d/.
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type MainBirdConfOptions struct {
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// RouterID is the BIRD router id (IPv4 dotted quad recommended).
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RouterID string
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// Includes are paths as in include "…" (e.g. bird.d/evobgp_prefixes_v4.conf).
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Includes []string
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// Preamble is optional comment lines (each line prefixed with #), no trailing newline required.
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Preamble string
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}
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// RenderMainBirdConf returns a BIRD 2 main config: device, direct, include lines.
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// RouterID must be non-empty.
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func RenderMainBirdConf(opts MainBirdConfOptions) (string, error) {
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if strings.TrimSpace(opts.RouterID) == "" {
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return "", fmt.Errorf("birdfmt: router id is required")
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}
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var b strings.Builder
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pre := strings.TrimSpace(opts.Preamble)
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if pre != "" {
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for _, line := range strings.Split(pre, "\n") {
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line = strings.TrimRight(line, "\r")
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if line == "" {
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b.WriteByte('\n')
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continue
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}
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if !strings.HasPrefix(line, "#") {
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b.WriteString("# ")
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}
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b.WriteString(line)
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b.WriteByte('\n')
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}
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b.WriteByte('\n')
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}
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b.WriteString("router id ")
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b.WriteString(strings.TrimSpace(opts.RouterID))
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b.WriteString(";\n\n")
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for _, inc := range opts.Includes {
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inc = strings.TrimSpace(inc)
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if inc == "" {
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continue
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}
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b.WriteString("include \"")
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b.WriteString(inc)
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b.WriteString("\";\n")
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}
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if len(opts.Includes) > 0 {
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b.WriteByte('\n')
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}
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b.WriteString(`protocol device {
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}
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protocol direct {
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ipv4;
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ipv6;
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}
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`)
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return b.String(), nil
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}
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