started to implement a simple ifconfig

4 files changed, 81 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index dd89fae..a33b419 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,8 @@ LIB = $(LIBUTF) $(LIBUTIL)
 
 BIN =\
 	more\
-	hexdump
+	hexdump\
+	ifconfig
 
 LIBUTILOBJ = $(LIBUTILSRC:.c=.o)
 OBJ = $(BIN:=.o) $(LIBUTFOBJ) $(LIBUTILOBJ)
diff --git a/README b/README
index 1bba99e..295c21a 100644
--- a/README
+++ b/README
@@ -8,6 +8,7 @@ Currently it contains the following:
 - a simple 'hexdump'
 - a 'fdisk' (but we have to decide for which kind of partition types
   and what kind of operations, could be too big)
+- a 'ifconfig'
 
 Note: abase is a shameless copy of sbase/ubase in certain areas like
 the Makefile, libutil, etc. This might also make an integration into
@@ -32,4 +33,18 @@ Portability
 Not really tested so far, but you should be able to build it with
 gcc, clang, tcc, nwcc and pcc.
 
+Bugs and Questions
+------------------
+
+- more
+  - even non-line keyboard input is not portable
+  - how to enable terminal formatting like bold and make things not
+    depend on ncurses/termcap?
+- ifconfig
+  - implementations
+    - GNU net-tools
+    - net-3-tools
+    - nosh
+  - netlink api or ioctls
+    
 [1] http://www.musl-libc.org/
diff --git a/ifconfig.1 b/ifconfig.1
new file mode 100644
index 0000000..9468f98
--- /dev/null
+++ b/ifconfig.1
@@ -0,0 +1,18 @@
+.Dd 2023-04-24
+.Dt IFCONFIG 1
+.Os abase
+.Sh NAME
+.Nm ifconfig
+.Nd inspect and manipulate network settings
+.Sh SYNOPSIS
+.Nm
+.Sh DESCRIPTION
+.Nm
+.Sh OPTIONS
+.sp
+.RE
+\fB\-a\fP
+.RS 4
+Show all network interfaces and configurations
+.RE
+
diff --git a/ifconfig.c b/ifconfig.c
new file mode 100644
index 0000000..2d3b8eb
--- /dev/null
+++ b/ifconfig.c
@@ -0,0 +1,46 @@
+/* See LICENSE file for copyright and license details. */
+#include <net/if.h>
+#include <stdio.h>
+
+#include "util.h"
+
+static void
+usage(void)
+{
+	eprintf("usage: %s [-a]\n", argv0);
+}
+
+static void
+print_interface(char *name)
+{
+	printf("%s\n", name);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int show_all = 0;
+	//~ struct ifreq ifr;
+	
+	ARGBEGIN {
+	case 'a':
+		show_all = 1;
+		break;
+	default:
+		usage();
+	} ARGEND
+	
+	if (show_all) {
+		struct if_nameindex *interfaces, *interface;
+		
+		interfaces = if_nameindex();
+		if (interfaces != NULL) {
+			for (interface = interfaces; (interface->if_index != 0 || interface->if_name != NULL); interface++) {
+				print_interface(interface->if_name);
+			}
+			if_freenameindex(interfaces);
+		}
+	}
+	
+	return 0;
+}