udhcp: simplify SO_BINDTODEVICE call

2 files changed, 3 insertions, 4 deletions

diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index 66a0b0d8b..de4a8c75a 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -91,8 +91,8 @@ void udhcp_run_script(struct dhcpMessage *packet, const char *name) FAST_FUNC;
 void udhcp_sp_setup(void) FAST_FUNC;
 int udhcp_sp_fd_set(fd_set *rfds, int extra_fd) FAST_FUNC;
 int udhcp_sp_read(const fd_set *rfds) FAST_FUNC;
-int udhcp_raw_socket(int ifindex) FAST_FUNC;
 int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *addr, uint8_t *arp) FAST_FUNC;
+int udhcp_raw_socket(int ifindex) FAST_FUNC;
 int udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf) FAST_FUNC;
 /* Returns 1 if no reply received */
 int arpping(uint32_t test_ip, uint32_t from_ip, uint8_t *from_mac, const char *interface) FAST_FUNC;
diff --git a/networking/udhcp/socket.c b/networking/udhcp/socket.c
index 2d272510d..ea0a2c3a8 100644
--- a/networking/udhcp/socket.c
+++ b/networking/udhcp/socket.c
@@ -88,7 +88,6 @@ int FAST_FUNC udhcp_read_interface(const char *interface, int *ifindex, uint32_t
 int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf)
 {
         int fd;
-        struct ifreq interface;
         struct sockaddr_in addr;
 
         DEBUG("Opening listen socket on *:%d %s", port, inf);
@@ -98,8 +97,8 @@ int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf)
         if (setsockopt_broadcast(fd) == -1)
                 bb_perror_msg_and_die("SO_BROADCAST");
 
-        strncpy(interface.ifr_name, inf, IFNAMSIZ);
-        if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &interface, sizeof(interface)) == -1)
+        /* NB: bug 1032 says this doesn't work on ethernet aliases (ethN:M) */
+        if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &inf, strlen(inf) + 1) == -1)
                 bb_perror_msg_and_die("SO_BINDTODEVICE");
 
         memset(&addr, 0, sizeof(addr));