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package globalfilter
import (
"fmt"
"strings"
"ior/internal/event"
"ior/internal/types"
)
// ValidateTracepointFields checks string filters that are applied against
// fixed-size kernel event fields before pair reconstruction.
func (f Filter) ValidateTracepointFields() error {
if err := validateTraceStringFilter("comm", f.Comm, types.MAX_PROGNAME_LENGTH); err != nil {
return err
}
if err := validateTraceStringFilter("path", f.File, types.MAX_FILENAME_LENGTH); err != nil {
return err
}
return nil
}
// UsesCommFilter reports whether the filter needs command-name matching.
func (f Filter) UsesCommFilter() bool {
return hasStringPattern(f.Comm)
}
// MatchPair reports whether a completed syscall pair satisfies the filter.
func (f Filter) MatchPair(pair *event.Pair) bool {
if pair == nil {
return false
}
return f.Matches(pairCandidate{pair: pair})
}
// MatchOpenEvent applies the subset of the filter that can be evaluated on raw
// open events before exit pairing.
func (f Filter) MatchOpenEvent(ev *types.OpenEvent) bool {
if ev == nil {
return false
}
if !matchString(f.Comm, types.StringValue(ev.Comm[:])) {
return false
}
return matchString(f.File, types.StringValue(ev.Filename[:]))
}
// MatchPathEvent applies the path-related subset of the filter to raw path events.
func (f Filter) MatchPathEvent(ev *types.PathEvent) bool {
if ev == nil {
return false
}
return matchString(f.File, types.StringValue(ev.Pathname[:]))
}
// MatchNameEvent applies the path-related subset of the filter to raw rename-like events.
func (f Filter) MatchNameEvent(ev *types.NameEvent) bool {
if ev == nil {
return false
}
if !hasStringPattern(f.File) {
return true
}
return matchString(f.File, types.StringValue(ev.Oldname[:])) ||
matchString(f.File, types.StringValue(ev.Newname[:]))
}
func hasStringPattern(filter *StringFilter) bool {
return filter != nil && strings.TrimSpace(filter.Pattern) != ""
}
func validateTraceStringFilter(name string, filter *StringFilter, maxLen int) error {
if !hasStringPattern(filter) {
return nil
}
pattern := strings.TrimSpace(filter.Pattern)
if len(pattern) > maxLen {
return fmt.Errorf("%s filter max size is %d (got %d)", name, maxLen, len(pattern))
}
return nil
}
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