arping: stop using last gethostbyname2 in the tree

hostname: small optimization

3 files changed, 9 insertions, 12 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 8cd4bc377..fda0dbe40 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -338,8 +338,6 @@ char* xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa, socklen_t salen)
 // "old" (ipv4 only) API
 // users: traceroute.c hostname.c ifconfig.c ping.c
 struct hostent *xgethostbyname(const char *name);
-//TODO: eliminate gethostbyname2 in arping (the only remaining place),
-//use host_and_af2sockaddr instead.
 
 
 extern char *xstrdup(const char *s);
diff --git a/networking/arping.c b/networking/arping.c
index 55b27872b..725b0e4cb 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -305,13 +305,11 @@ int arping_main(int argc, char **argv)
 	}
 
 	if (!inet_aton(target, &dst)) {
-		struct hostent *hp;
-
-		hp = gethostbyname2(target, AF_INET);
-		if (!hp) {
-			bb_error_msg_and_die("invalid or unknown target %s", target);
-		}
-		memcpy(&dst, hp->h_addr, 4);
+		len_and_sockaddr *lsa;
+		lsa = host_and_af2sockaddr(target, 0, AF_INET);
+		memcpy(&dst, &lsa->sin.sin_addr.s_addr, 4);
+		if (ENABLE_FEATURE_CLEAN_UP)
+			free(lsa);
 	}
 
 	if (source && !inet_aton(source, &src)) {
diff --git a/networking/hostname.c b/networking/hostname.c
index 6d3b8ebb8..7116a14df 100644
--- a/networking/hostname.c
+++ b/networking/hostname.c
@@ -48,11 +48,12 @@ int hostname_main(int argc, char **argv)
 		OPT_f = 0x2,
 		OPT_i = 0x4,
 		OPT_s = 0x8,
+		OPT_F = 0x8,
 		OPT_dfis = 0xf,
 	};
 
 	char buf[256];
-	char *hostname_str = NULL;
+	char *hostname_str;
 
 	if (argc < 1)
 		bb_show_usage();
@@ -70,7 +71,7 @@ int hostname_main(int argc, char **argv)
 			puts(hp->h_name);
 		} else if (option_mask32 & OPT_s) {
 			if (p != NULL) {
-				*p = 0;
+				*p = '\0';
 			}
 			puts(hp->h_name);
 		} else if (option_mask32 & OPT_d) {
@@ -84,7 +85,7 @@ int hostname_main(int argc, char **argv)
 		}
 	}
 	/* Set the hostname */
-	else if (hostname_str != NULL) {
+	else if (option_mask32 & OPT_F) {
 		do_sethostname(hostname_str, 1);
 	} else if (optind < argc) {
 		do_sethostname(argv[optind], 0);