now compiles without gmake also picks a nice (existing) interface as

default

3 files changed, 23 insertions, 11 deletions

diff --git a/Makefile b/Makefile
index 8446f29..87abdc4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-# $Id: Makefile 97 2000-08-13 16:06:31Z marvin $
+# $Id: Makefile 120 2000-09-09 22:20:30Z marvin $
 TARGETS=arping
 
 USE_NETIF=0
@@ -9,7 +9,7 @@ CFLAGS=-g -I/usr/local/include -L/usr/local/lib -DUSE_NETIF=$(USE_NETIF) -DOPENB
 
 usage:
 	@echo
-	@echo "usage: (g)make [ target ]"
+	@echo "usage: make [ target ]"
 	@echo "Target can be openbsd or linux"
 	@echo
 
@@ -17,13 +17,13 @@ linux:
 	make USE_NETIF=1 LINUX=1 all
 
 openbsd:
-	gmake OPENBSD=1 all
+	make OPENBSD=1 all
 
 
 all: $(TARGETS)
 
-%.o: %.c
-	gcc -Wall $(CFLAGS) -c `libnet-config --defines` `libnet-config --cflags` $<
+arping.o: arping.c
+	gcc -Wall $(CFLAGS) -c `libnet-config --defines` `libnet-config --cflags` arping.c
 
 O_arping=arping.o
 arping: $(O_arping)
diff --git a/README b/README
index 427fab7..9ec27d1 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-$Id: README 97 2000-08-13 16:06:31Z marvin $
+$Id: README 120 2000-09-09 22:20:30Z marvin $
 
  ARP Ping
 
@@ -86,8 +86,12 @@ A: Arping depends on libnet and libpcap, get libnet at:
 ---
 Q: I get bus error on my bigendian box
 
-A: Damn, I thought I fixed those. Tell me how you got it and I'll try to fix it.
+A: Damn, I thought I fixed those. Tell me how you got it and I'll try to fix
+   it.
+---
+Q: I get "libnet_get_ipaddr(): no error" when I run arping with ip 0.0.0.0.
 
+A: Use the -0 switch.
 
 License
 -------
diff --git a/arping.c b/arping.c
index b53a68c..1e3cc2a 100644
--- a/arping.c
+++ b/arping.c
@@ -12,7 +12,7 @@
  *
  * Also finds out IP of specified MAC
  *
- * $Id: arping.c 97 2000-08-13 16:06:31Z marvin $
+ * $Id: arping.c 120 2000-09-09 22:20:30Z marvin $
  */
 /*
  *  Copyright (C) 2000 Marvin (marvin@nss.nu)
@@ -72,10 +72,11 @@ u_int ip_xmas = 0xffffffff;
 pcap_t *pcap;
 struct bpf_program bpf_prog;
 struct in_addr net,mask;
-#if OPENBSD
-char *ifname = "le0";
-#else
+#if 0
+// Use this if you want to hard-code a default interface
 char *ifname = "eth0";
+#else
+char *ifname = NULL;
 #endif
 u_long dip = 0;
 u_char *packet;
@@ -324,6 +325,13 @@ int main(int argc, char **argv)
 	/*
 	 * libnet init
 	 */
+	if (!ifname) {
+		if (!(ifname = pcap_lookupdev(ebuf))) {
+			fprintf(stderr, "pcap_lookupdev(): %s\n", ebuf);
+			exit(1);
+		}
+	}
+
 	if (!(linkint = libnet_open_link_interface(ifname, ebuf))) {
 		fprintf(stderr, "libnet_get_hwaddr(): %s\n", ebuf);
 		exit(1);