*: fix SO_BINDTODEVICE. Kernel wants at least IFNAMSIZ bytes there.

1 files changed, 15 insertions, 0 deletions

diff --git a/libbb/xconnect.c b/libbb/xconnect.c
index 5be83241b..d078e9811 100644
--- a/libbb/xconnect.c
+++ b/libbb/xconnect.c
@@ -8,6 +8,7 @@
  */
 
 #include <netinet/in.h>
+#include <net/if.h>
 #include "libbb.h"
 
 void FAST_FUNC setsockopt_reuseaddr(int fd)
@@ -18,6 +19,20 @@ int FAST_FUNC setsockopt_broadcast(int fd)
 {
         return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
 }
+int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
+{
+        int r;
+        struct ifreq ifr;
+        strncpy_IFNAMSIZ(ifr.ifr_name, iface);
+        /* Actually, ifr_name is at offset 0, and in practice
+         * just giving char[IFNAMSIZ] instead of struct ifreq works too.
+         * But just in case it's not true on some obscure arch... */
+        r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
+        if (r)
+                bb_perror_msg("can't bind to interface %s", iface);
+        return r;
+}
+
 
 void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
 {