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Pull request: all: imp cyclo in new code

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Updates #2646,

Squashed commit of the following:

commit af6a6fa2b7229bc0f1c7c9083b0391a6bec7ae70
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon May 31 20:00:36 2021 +0300

    all: imp code, docs

commit 1cd4781b13e635a9e1bccb758104c1b76c78d34e
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon May 31 18:51:23 2021 +0300

    all: imp cyclo in new code
This commit is contained in:
Ainar Garipov
2021-05-31 20:11:06 +03:00
parent c95acf73ab
commit e17e1f20fb
10 changed files with 211 additions and 190 deletions
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49
internal/aghnet/net_linux.go
View File

@@ -68,40 +68,41 @@ func ifaceHasStaticIP(ifaceName string) (has bool, err error) {
return false, ErrNoStaticIPInfo
}
// findIfaceLine scans s until it finds the line that declares an interface with
// the given name. If findIfaceLine can't find the line, it returns false.
func findIfaceLine(s *bufio.Scanner, name string) (ok bool) {
for s.Scan() {
line := strings.TrimSpace(s.Text())
fields := strings.Fields(line)
if len(fields) == 2 && fields[0] == "interface" && fields[1] == name {
return true
}
}
return false
}
// dhcpcdStaticConfig checks if interface is configured by /etc/dhcpcd.conf to
// have a static IP.
func dhcpcdStaticConfig(r io.Reader, ifaceName string) (has bool, err error) {
s := bufio.NewScanner(r)
var withinInterfaceCtx bool
ifaceFound := findIfaceLine(s, ifaceName)
if !ifaceFound {
return false, s.Err()
}
for s.Scan() {
line := strings.TrimSpace(s.Text())
if withinInterfaceCtx && len(line) == 0 {
// An empty line resets our state.
withinInterfaceCtx = false
}
if len(line) == 0 || line[0] == '#' {
continue
}
fields := strings.Fields(line)
if withinInterfaceCtx {
if len(fields) >= 2 && fields[0] == "static" && strings.HasPrefix(fields[1], "ip_address=") {
return true, nil
}
if len(fields) > 0 && fields[0] == "interface" {
// Another interface found.
withinInterfaceCtx = false
}
continue
if len(fields) >= 2 &&
fields[0] == "static" &&
strings.HasPrefix(fields[1], "ip_address=") {
return true, s.Err()
}
if len(fields) == 2 && fields[0] == "interface" && fields[1] == ifaceName {
// The interface found.
withinInterfaceCtx = true
if len(fields) > 0 && fields[0] == "interface" {
// Another interface found.
break
}
}