update the bcast example to broadcast on all available ipv4 interfaces

to detect nfs servers on the locally attached networks

diff --git a/examples/nfsclient-bcast.c b/examples/nfsclient-bcast.c
index c74c5b37764b8e12a9aa002ee714aadf24deb17f..47fd28cfbd50578ef85af221453c5f4c372d53ff 100644 (file)
--- a/examples/nfsclient-bcast.c
+++ b/examples/nfsclient-bcast.c
@@ -25,6 +25,8 @@
 #include <poll.h>
 #include <errno.h>
 #include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
 #include <netdb.h>
 #include "libnfs.h"
 #include "libnfs-raw.h"
@@ -61,6 +63,8 @@ int main(int argc _U_, char *argv[] _U_)
 {
        struct rpc_context *rpc;
        struct pollfd pfd;
+       struct ifconf ifc;
+       int i, size;
        
        rpc = rpc_init_udp_context();
        if (rpc == NULL) {
@@ -73,24 +77,63 @@ int main(int argc _U_, char *argv[] _U_)
                exit(10);
        }
 
-       if (rpc_set_udp_destination(rpc, "10.1.1.255", 111, 1) < 0) {
-               printf("failed to set udp destination %s\n", rpc_get_error(rpc));
-               exit(10);
-       }
 
-       if (rpc_pmap_callit_async(rpc, 100005, 2, 0, NULL, 0, pm_cb, NULL) < 0) {
-               printf("Failed to set up callit function\n");
-               exit(10);
-       }
-       if (rpc_set_udp_destination(rpc, "10.9.2.255", 111, 1) < 0) {
-               printf("failed to set udp destination %s\n", rpc_get_error(rpc));
-               exit(10);
-       }
+       /* get list of all interfaces */
+       size = sizeof(struct ifreq);
+       ifc.ifc_buf = NULL;
+       ifc.ifc_len = size;
 
-       if (rpc_pmap_callit_async(rpc, 100005, 2, 0, NULL, 0, pm_cb, NULL) < 0) {
-               printf("Failed to set up callit function\n");
-               exit(10);
+       while (ifc.ifc_len == size) {
+               size *= 2;
+
+               free(ifc.ifc_buf);      
+               ifc.ifc_len = size;
+               ifc.ifc_buf = malloc(size);
+               if (ioctl(rpc_get_fd(rpc), SIOCGIFCONF, (caddr_t)&ifc) < 0) {
+                       printf("ioctl SIOCGIFCONF failed\n");
+                       exit(10);
+               }
+       }       
+
+       for (i=0; i<ifc.ifc_len / sizeof(struct ifconf); i++) {
+               char bcdd[16];
+
+               if (ifc.ifc_req[i].ifr_addr.sa_family != AF_INET) {
+                       continue;
+               }
+               if (ioctl(rpc_get_fd(rpc), SIOCGIFFLAGS, &ifc.ifc_req[i]) < 0) {
+                       printf("ioctl DRBADDR failed\n");
+                       exit(10);
+               }
+               if (!(ifc.ifc_req[i].ifr_flags & IFF_UP)) {
+                       continue;
+               }
+               if (ifc.ifc_req[i].ifr_flags & IFF_LOOPBACK) {
+                       continue;
+               }
+               if (!(ifc.ifc_req[i].ifr_flags & IFF_BROADCAST)) {
+                       continue;
+               }
+               if (ioctl(rpc_get_fd(rpc), SIOCGIFBRDADDR, &ifc.ifc_req[i]) < 0) {
+                       printf("ioctl DRBADDR failed\n");
+                       exit(10);
+               }
+               if (getnameinfo(&ifc.ifc_req[i].ifr_broadaddr, sizeof(struct sockaddr_in), &bcdd[0], sizeof(bcdd), NULL, 0, NI_NUMERICHOST) < 0) {
+                       printf("getnameinfo failed\n");
+                       exit(10);
+               }
+               if (rpc_set_udp_destination(rpc, bcdd, 111, 1) < 0) {
+                       printf("failed to set udp destination %s\n", rpc_get_error(rpc));
+                       exit(10);
+               }
+
+               if (rpc_pmap_callit_async(rpc, MOUNT_PROGRAM, 2, 0, NULL, 0, pm_cb, NULL) < 0) {
+                       printf("Failed to set up callit function\n");
+                       exit(10);
+               }
        }
+       free(ifc.ifc_buf);      
+
 
        alarm(3);
 
@@ -107,7 +150,7 @@ int main(int argc _U_, char *argv[] _U_)
                        break;
                }
        }
-       
+
        rpc_destroy_context(rpc);
        rpc=NULL;
        printf("nfsclient finished\n");