*: gethostname-related fixes

function                                             old     new   delta
hostname_main                                        218     231     +13
nfsmount                                            3541    3474     -67

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

3 files changed, 13 insertions, 35 deletions

diff --git a/libbb/xconnect.c b/libbb/xconnect.c
index 8a1e1c1..97751eb 100644
--- a/libbb/xconnect.c
+++ b/libbb/xconnect.c
@@ -96,28 +96,6 @@ unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsign
 }
 
 
-/* "Old" networking API - only IPv4 */
-
-/*
-void FAST_FUNC bb_lookup_host(struct sockaddr_in *s_in, const char *host)
-{
-	struct hostent *he;
-
-	memset(s_in, 0, sizeof(struct sockaddr_in));
-	s_in->sin_family = AF_INET;
-	he = xgethostbyname(host);
-	memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
-}
-
-
-int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
-{
-	int s = xsocket(AF_INET, SOCK_STREAM, 0);
-	xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
-	return s;
-}
-*/
-
 /* "New" networking API */
 
 
diff --git a/networking/hostname.c b/networking/hostname.c
index 579eff7..121ad40 100644
--- a/networking/hostname.c
+++ b/networking/hostname.c
@@ -132,10 +132,14 @@ int hostname_main(int argc UNUSED_PARAM, char **argv)
 			if (*p)
 				puts(p + 1);
 		} else /*if (opts & OPT_i)*/ {
-			while (hp->h_addr_list[0]) {
-				printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++)));
+			if (hp->h_length == sizeof(struct in_addr)) {
+				struct in_addr **h_addr_list = (struct in_addr **)hp->h_addr_list;
+				while (*h_addr_list) {
+					printf("%s ", inet_ntoa(**h_addr_list));
+					h_addr_list++;
+				}
+				bb_putchar('\n');
 			}
-			bb_putchar('\n');
 		}
 	} else if (opts & OPT_F) {
 		/* Set the hostname */
diff --git a/util-linux/mount.c b/util-linux/mount.c
index 4392363..620b146 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -1043,12 +1043,10 @@ static NOINLINE int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
 			bb_herror_msg("%s", hostname);
 			goto fail;
 		}
-		if ((size_t)hp->h_length > sizeof(struct in_addr)) {
-			bb_error_msg("got bad hp->h_length");
-			hp->h_length = sizeof(struct in_addr);
+		if (hp->h_length != (int)sizeof(struct in_addr)) {
+			bb_error_msg_and_die("only IPv4 is supported");
 		}
-		memcpy(&server_addr.sin_addr,
-				hp->h_addr, hp->h_length);
+		memcpy(&server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
 	}
 
 	memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
@@ -1331,13 +1329,11 @@ static NOINLINE int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
 				bb_herror_msg("%s", mounthost);
 				goto fail;
 			}
-			if ((size_t)hp->h_length > sizeof(struct in_addr)) {
-				bb_error_msg("got bad hp->h_length");
-				hp->h_length = sizeof(struct in_addr);
+			if (hp->h_length != (int)sizeof(struct in_addr)) {
+				bb_error_msg_and_die("only IPv4 is supported");
 			}
 			mount_server_addr.sin_family = AF_INET;
-			memcpy(&mount_server_addr.sin_addr,
-						hp->h_addr, hp->h_length);
+			memcpy(&mount_server_addr.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
 		}
 	}