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|
package internal
import "C"
import (
"fmt"
. "ioriotng/internal/generated/types"
bpf "github.com/aquasecurity/libbpfgo"
)
func eventLoop(bpfModule *bpf.Module, rawCh <-chan []byte) {
for ev := range events(rawCh) {
fmt.Println(ev)
ev.recycle()
}
fmt.Println("Good bye")
}
func events(rawCh <-chan []byte) <-chan enterExitEvent {
// Channel of events (enter+exit tracepoint results of a syscall).
evCh := make(chan enterExitEvent)
// Temp. store of sys_enter tracepoints per Tid.
enterEvs := make(map[uint32]enterExitEvent)
// Track all open files by file descriptor.
files := make(map[int32]file)
// Program or thread name of the current Tid.
comms := make(map[uint32]string)
enter := func(enterEv event) {
enterEvs[enterEv.GetTid()] = enterExitEvent{
enterEv: enterEv,
}
}
exit := func(exitEv event) {
ev, ok := enterEvs[exitEv.GetTid()]
if !ok {
exitEv.Recycle()
return
}
delete(enterEvs, exitEv.GetTid())
ev.exitEv = exitEv
// TODO: Rename SyscallId to TraceId
// Expect ID one lower, otherwise, enter and exit tracepoints
// don't match up. E.g.:
// enterEv:SYS_ENTER_OPEN => exitEv:SYS_EXIT_OPEN
if ev.enterEv.GetSyscallId()-1 != ev.exitEv.GetSyscallId() {
ev.tracepointMismatch = true
}
// TODO: switch here on type?
// Handle file open.
if ev.is(SYS_ENTER_OPENAT) || ev.is(SYS_ENTER_OPEN) {
openEnterEv := ev.enterEv.(*OpenEnterEvent)
fd := ev.exitEv.(*FdEvent).Fd
file := fdFile{fd, string(openEnterEv.Filename[:])}
if fd >= 0 {
files[fd] = file
}
ev.file = file
comm := string(openEnterEv.Comm[:])
comms[openEnterEv.Tid] = comm
ev.comm = comm
evCh <- ev
return
}
// Generic handling of any syscall with newname/oldname arguments
if nameEvent, ok := ev.enterEv.(*NameEvent); ok {
ev.file = oldnameNewnameFile{
oldname: string(nameEvent.Oldname[:]),
newname: string(nameEvent.Newname[:]),
}
}
// Generic handling of any syscall expecting a file descriptor (fd)
if fdEvent, ok := ev.enterEv.(*FdEvent); ok {
if file_, ok := files[fdEvent.Fd]; ok {
ev.file = file_
} else {
ev.file = fdFile{fdEvent.Fd, "?"}
}
if ev.is(SYS_ENTER_CLOSE) {
delete(files, fdEvent.Fd)
}
}
ev.comm, _ = comms[ev.enterEv.GetTid()]
evCh <- ev
}
// Deserialise raw byte stream from BPF ringbuffer.
go func() {
defer close(evCh)
for raw := range rawCh {
switch EventType(raw[0]) {
case ENTER_OPEN_EVENT:
enter(NewOpenEnterEvent(raw))
case EXIT_OPEN_EVENT:
exit(NewFdEvent(raw))
case ENTER_FD_EVENT:
enter(NewFdEvent(raw))
case EXIT_FD_EVENT:
exit(NewFdEvent(raw))
case EXIT_NULL_EVENT:
exit(NewNullEvent(raw))
case EXIT_RET_EVENT:
exit(NewRetEvent(raw))
case ENTER_NAME_EVENT:
enter(NewNameEvent(raw))
default:
panic(fmt.Sprintf("Unhandled event type %s", EventType(raw[0])))
}
}
}()
return evCh
}
|
