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|
package endpoints
import (
"bytes"
"net"
"regexp"
"github.com/lxc/incus/v6/shared/logger"
)
type networkServerErrorLogWriter struct {
proxies []net.IP
}
// Regex for the log we want to ignore.
var unwantedLogRegex = regexp.MustCompile(`^http: TLS handshake error from ([^\[:]+?|\[([^\]]+?)\]):[0-9]+: .+: connection reset by peer$`)
func (d networkServerErrorLogWriter) Write(p []byte) (int, error) {
strippedLog := d.stripLog(p)
if strippedLog == "" {
return 0, nil
}
logger.Info(strippedLog)
return len(p), nil
}
func (d networkServerErrorLogWriter) stripLog(p []byte) string {
// Strip the beginning of the log until we reach "http:".
for len(p) > 5 && string(p[0:5]) != "http:" {
p = bytes.TrimLeftFunc(p, func(r rune) bool {
return r != 'h'
})
}
// Strip the newline from the end.
p = bytes.TrimRightFunc(p, func(r rune) bool {
return r == '\n'
})
// Get the source IP address.
match := unwantedLogRegex.FindSubmatch(p)
var sourceIP string
if match != nil {
if match[2] != nil {
// Inner match omits parentheses of ipv6 address.
sourceIP = string(match[2])
} else if match[1] != nil {
sourceIP = string(match[1])
}
}
// Discard the log if the source is in our list of trusted proxies.
if sourceIP != "" {
for _, ip := range d.proxies {
if ip.String() == sourceIP {
return ""
}
}
}
return string(p)
}
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