OS-4807 arp(1M) and ndp(1M) should use zone_get_nroot()

@@ -38,10 +38,11 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <inet/ip.h>
 #include <net/if_dl.h>
 #include <net/route.h>
+#include <zone.h>
 
 typedef struct  sockaddr_in6    sin6_t;
 
 #define BUF_SIZE 2048
 typedef struct rtmsg_pkt {

@@ -93,18 +94,18 @@
 static  int     ndp_set(int, struct lifreq *, void *);
 static  int     ndp_set_nce(char *, char *, char *[], int);
 static  int     ndp_set_file(char *);
 
 static  char            *ndp_iface = NULL;
-static  char            *netstat_path = "/usr/bin/netstat";
 static  pid_t           ndp_pid;
 static  boolean_t       ndp_noresolve = B_FALSE; /* Don't lookup addresses */
 static  boolean_t       ndp_run = B_TRUE;
 
 #define MAX_ATTEMPTS 5
 #define MAX_OPTS 5
 #define WORDSEPS " \t\r\n"
+#define NETSTAT_PATH    "/usr/bin/netstat"
 
 /*
  * Macros borrowed from route(1M) for working with PF_ROUTE messages
  */
 #define RT_ADVANCE(x, n) ((x) += ndp_salen(n))

@@ -765,10 +766,16 @@
  * Print out all NDP entries
  */
 static void
 ndp_get_all(void)
 {
+        char netstat_path[MAXPATHLEN];
+        const char *zroot = zone_get_nroot();
+
+        (void) snprintf(netstat_path, sizeof (netstat_path), "%s%s", zroot != NULL ?
+            zroot : "", NETSTAT_PATH);
+
         (void) execl(netstat_path, "netstat",
             (ndp_noresolve ? "-np" : "-p"),
             "-f", "inet6", (char *)0);
         ndp_fatal("Coudn't exec %s: %s", netstat_path, strerror(errno));
 }