From f9b3170f0ec4ad390285c8c77b31782c0cac226a Mon Sep 17 00:00:00 2001
From: bjorn3 <17426603+bjorn3@users.noreply.github.com>
Date: Wed, 28 Feb 2024 10:44:18 +0100
Subject: [PATCH] Allow network adapters to be named

This will be necessary in the future to support multiple network
adapters in a single system.
---
 src/lib/error.rs     | 11 +++++++++++
 src/smolnetd/main.rs | 45 ++++++++++++++++++++++++++++++++++++++------
 2 files changed, 50 insertions(+), 6 deletions(-)

diff --git a/src/lib/error.rs b/src/lib/error.rs
index 5ab5ba3071..0c5191e146 100644
--- a/src/lib/error.rs
+++ b/src/lib/error.rs
@@ -7,6 +7,7 @@ use syscall::error::Error as SyscallError;
 enum ErrorType {
     Syscall(SyscallError),
     IOError(IOError),
+    Other,
 }
 
 pub struct Error {
@@ -28,6 +29,13 @@ impl Error {
             descr: descr.into(),
         }
     }
+
+    pub fn other_error<S: Into<String>>(descr: S) -> Error {
+        Error {
+            error_type: ErrorType::Other,
+            descr: descr.into()
+        }
+    }
 }
 
 impl fmt::Display for Error {
@@ -39,6 +47,9 @@ impl fmt::Display for Error {
             ErrorType::IOError(ref io_error) => {
                 write!(f, "{} : io error : {}", self.descr, io_error)
             }
+            ErrorType::Other => {
+                write!(f, "{}", self.descr)
+            }
         }
     }
 }
diff --git a/src/smolnetd/main.rs b/src/smolnetd/main.rs
index 36a34dffbd..d750abbbc1 100644
--- a/src/smolnetd/main.rs
+++ b/src/smolnetd/main.rs
@@ -18,6 +18,7 @@ use redox_netstack::error::{Error, Result};
 use redox_netstack::logger;
 use scheme::Smolnetd;
 use smoltcp::wire::EthernetAddress;
+use syscall::flag::*;
 
 mod buffer_pool;
 mod link;
@@ -25,15 +26,47 @@ mod port_set;
 mod router;
 mod scheme;
 
-fn run(daemon: redox_daemon::Daemon) -> Result<()> {
-    use syscall::flag::*;
+fn get_network_adapter() -> Result<String> {
+    use std::fs;
 
-    trace!("opening network:");
-    let network_fd = syscall::open("network:", O_RDWR | O_NONBLOCK)
-        .map_err(|e| Error::from_syscall_error(e, "failed to open network:"))?
+    let mut adapters = vec![];
+
+    for entry_res in fs::read_dir("/scheme")? {
+        let Ok(entry) = entry_res else {
+            continue;
+        };
+
+        let Ok(scheme) = entry.file_name().into_string() else {
+            continue;
+        };
+
+        if !scheme.starts_with("network") {
+            continue;
+        }
+
+        adapters.push(scheme);
+    }
+
+    if adapters.is_empty() {
+        Err(Error::other_error("no network adapter found"))
+    } else {
+        let adapter = adapters.remove(0);
+        if !adapters.is_empty() {
+            // FIXME allow using multiple network adapters at the same time
+            warn!("Multiple network adapters found. Only {adapter} will be used");
+        }
+        Ok(adapter)
+    }
+}
+
+fn run(daemon: redox_daemon::Daemon) -> Result<()> {
+    let adapter = get_network_adapter()?;
+    trace!("opening {adapter}:");
+    let network_fd = syscall::open(format!("{adapter}:"), O_RDWR | O_NONBLOCK)
+        .map_err(|e| Error::from_syscall_error(e, format!("failed to open {adapter}:")))?
         as RawFd;
 
-    let hardware_addr = std::fs::read("network:mac")
+    let hardware_addr = std::fs::read(format!("{adapter}:mac"))
         .map(|mac_address| EthernetAddress::from_bytes(&mac_address))
         .expect("failed to get mac address from network adapter");