paing: make -I ethN work too (-I addr already worked)

diff --git a/networking/ping.c b/networking/ping.c
index 8b70d9a..bd98a21 100644 (file)
--- a/networking/ping.c
+++ b/networking/ping.c
@@ -238,9 +238,10 @@ enum {
 
 struct globals {
        int pingsock;
+       int if_index;
+       char *opt_I;
        len_and_sockaddr *source_lsa;
        unsigned datalen;
-       int if_index;
        unsigned long ntransmitted, nreceived, nrepeats, pingcount;
        uint16_t myid;
        unsigned tmin, tmax; /* in us */
@@ -258,9 +259,10 @@ struct globals {
 };
 #define G (*(struct globals*)&bb_common_bufsiz1)
 #define pingsock     (G.pingsock    )
+#define if_index     (G.if_index    )
 #define source_lsa   (G.source_lsa  )
+#define opt_I        (G.opt_I       )
 #define datalen      (G.datalen     )
-#define if_index     (G.if_index    )
 #define ntransmitted (G.ntransmitted)
 #define nreceived    (G.nreceived   )
 #define nrepeats     (G.nrepeats    )
@@ -537,6 +539,8 @@ static void ping4(len_and_sockaddr *lsa)
                        bb_error_msg_and_die("can't set multicast source interface");
                xbind(pingsock, &source_lsa->sa, source_lsa->len);
        }
+       if (opt_I)
+               setsockopt(pingsock, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(opt_I) + 1);
 
        /* enable broadcast pings */
        setsockopt_broadcast(pingsock);
@@ -584,6 +588,8 @@ static void ping6(len_and_sockaddr *lsa)
        /* untested whether "-I addr" really works for IPv6: */
        if (source_lsa)
                xbind(pingsock, &source_lsa->sa, source_lsa->len);
+       if (opt_I)
+               setsockopt(pingsock, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(opt_I) + 1);
 
 #ifdef ICMP6_FILTER
        {
@@ -680,23 +686,26 @@ int ping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int ping_main(int argc, char **argv)
 {
        len_and_sockaddr *lsa;
-       char *opt_c, *opt_s, *opt_I;
+       char *opt_c, *opt_s;
        USE_PING6(sa_family_t af = AF_UNSPEC;)
 
        INIT_G();
 
-       datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
+       datalen = DEFDATALEN;
 
        /* exactly one argument needed, -v and -q don't mix */
        opt_complementary = "=1:q--v:v--q";
        getopt32(argv, OPT_STRING, &opt_c, &opt_s, &opt_I);
-       if (option_mask32 & OPT_c) pingcount = xatoul(opt_c); // -c
-       if (option_mask32 & OPT_s) datalen = xatou16(opt_s); // -s
+       if (option_mask32 & OPT_c)
+               pingcount = xatoul(opt_c); // -c
+       if (option_mask32 & OPT_s)
+               datalen = xatou16(opt_s); // -s
        if (option_mask32 & OPT_I) { // -I
                if_index = if_nametoindex(opt_I);
                if (!if_index) {
                        /* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
                        source_lsa = xdotted2sockaddr(opt_I, 0);
+                       opt_I = NULL; /* don't try to bind to device later */
                }
        }
        myid = (uint16_t) getpid();