config: add exe client criteria

src/utils/pid_info.rs

@@ -1,6 +1,7 @@
 use {
     crate::utils::{errorfmt::ErrorFmt, oserror::OsError},
     bstr::ByteSlice,
+    std::os::unix::ffi::OsStrExt,
     uapi::{OwnedFd, c},
 };
 
@@ -8,6 +9,7 @@ pub struct PidInfo {
     pub uid: c::uid_t,
     pub pid: c::pid_t,
     pub comm: String,
+    pub exe: String,
 }
 
 pub fn get_pid_info(uid: c::uid_t, pid: c::pid_t) -> PidInfo {
@@ -18,7 +20,24 @@ pub fn get_pid_info(uid: c::uid_t, pid: c::pid_t) -> PidInfo {
             "Unknown".to_string()
         }
     };
-    PidInfo { uid, pid, comm }
+    let exe = match std::fs::read_link(format!("/proc/{}/exe", pid)) {
+        Ok(name) => name
+            .as_os_str()
+            .as_bytes()
+            .trim_ascii_end()
+            .as_bstr()
+            .to_string(),
+        Err(e) => {
+            log::warn!("Could not read `exe` of pid {}: {}", pid, ErrorFmt(e));
+            "Unknown".to_string()
+        }
+    };
+    PidInfo {
+        uid,
+        pid,
+        comm,
+        exe,
+    }
 }
 
 pub fn get_socket_creds(socket: &OwnedFd) -> Option<(c::uid_t, c::pid_t)> {