Add: NASL builtin function recv_line

Also implements the buffer for TCP connections, as received messages must be buffered in order to read them line by line.

rust/src/nasl/builtin/network/README.md

@@ -12,6 +12,7 @@
 - islocalnet
 - get_host_ip
 - scanner_add_port
+- recv_line
 
 ## Missing
 
@@ -28,7 +29,6 @@
 - leave_multicast_group
 - open_priv_sock_tcp
 - open_priv_sock_udp
-- recv_line
 - scanner_get_port
 - start_denial
 - telnet_init

rust/src/nasl/builtin/network/network_utils.rs

@@ -7,6 +7,7 @@ use std::{
     net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, UdpSocket},
     ptr,
     str::FromStr,
+    time::Duration,
 };
 
 use crate::nasl::prelude::*;
@@ -22,6 +23,17 @@ pub fn ipstr2ipaddr(ip_addr: &str) -> Result<IpAddr, FunctionErrorKind> {
     }
 }
 
+/// Convert timeout
+pub fn convert_timeout(timeout: Option<i64>) -> Option<Duration> {
+    timeout.and_then(|timeout| {
+        if timeout < 1 {
+            None
+        } else {
+            Some(Duration::from_secs(timeout as u64))
+        }
+    })
+}
+
 /// Bind a local UDP socket to a V4 or V6 address depending on the given destination address
 pub fn bind_local_socket(dst: &SocketAddr) -> Result<UdpSocket, FunctionErrorKind> {
     let fe = Err(FunctionErrorKind::Diagnostic(