From e02eeef2c229b51fdbe45dccb5d969c65092aa9f Mon Sep 17 00:00:00 2001
From: Zack Buhman <zack@buhman.org>
Date: Fri, 28 Aug 2026 17:40:52 -0500
Subject: [PATCH] client: interface name from argv

---
 client.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/client.cpp b/client.cpp
index 42f162b..5eb047c 100644
--- a/client.cpp
+++ b/client.cpp
@@ -28,14 +28,20 @@ void print_message(packet::packet const& p, dhcp4::options const& options)
   printf("domain name server: %s\n", ip4::tostr(options.domain_name_server));
 }
 
-int main()
+int main(int argc, char * argv[])
 {
+  if (argc != 2) {
+    fprintf(stderr, "usage: %s [interface-name]\n", argv[0]);
+    exit(EXIT_FAILURE);
+  }
+  char const * interface_name = argv[1];
+  printf("interface name: %s\n", interface_name);
+
   srand(time(NULL));
   uint32_t dhcp_transaction_id = rand();
 
   int sock = sock::create(68);
 
-  char const * interface_name = "wlp174s0";
   int ifa_index = sock::interface_index(sock, interface_name);
   sock::bind_interface(sock, ifa_index);