1 files changed, 79 insertions, 0 deletions
diff --git a/auxiliary/name-addr-test/getnameinfo.c b/auxiliary/name-addr-test/getnameinfo.c
new file mode 100644
index 0000000..fa1d457
--- /dev/null
+++ b/auxiliary/name-addr-test/getnameinfo.c
@@ -0,0 +1,79 @@
+ /*
+  * getnameinfo(3) (address->name lookup) tester.
+  * 
+  * Compile with:
+  * 
+  * cc -o getnameinfo getnameinfo.c (BSD, Linux)
+  * 
+  * cc -o getnameinfo getnameinfo.c -lsocket -lnsl (SunOS 5.x)
+  * 
+  * Run as: getnameinfo address
+  * 
+  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
+  * 
+  * Author: Wietse Venema, IBM T.J. Watson Research, USA.
+  */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+
+int     main(int argc, char **argv)
+{
+    char    hostbuf[NI_MAXHOST];	/* XXX */
+    struct addrinfo hints;
+    struct addrinfo *res0;
+    struct addrinfo *res;
+    const char *host;
+    const char *addr;
+    int     err;
+
+#define NO_SERVICE ((char *) 0)
+
+    if (argc != 2) {
+	fprintf(stderr, "usage: %s ipaddress\n", argv[0]);
+	exit(1);
+    }
+
+    /*
+     * Convert address to internal form.
+     */
+    host = argv[1];
+    memset((char *) &hints, 0, sizeof(hints));
+    hints.ai_family = (strchr(host, ':') ? AF_INET6 : AF_INET);
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags |= AI_NUMERICHOST;
+    if ((err = getaddrinfo(host, NO_SERVICE, &hints, &res0)) != 0) {
+	fprintf(stderr, "getaddrinfo %s: %s\n", host, gai_strerror(err));
+	exit(1);
+    }
+
+    /*
+     * Convert host address to name.
+     */
+    for (res = res0; res != 0; res = res->ai_next) {
+	err = getnameinfo(res->ai_addr, res->ai_addrlen,
+			  hostbuf, sizeof(hostbuf),
+			  NO_SERVICE, 0, NI_NAMEREQD);
+	if (err) {
+	    fprintf(stderr, "getnameinfo %s: %s\n", host, gai_strerror(err));
+	    exit(1);
+	}
+	printf("Hostname:\t%s\n", hostbuf);
+	addr = (res->ai_family == AF_INET ?
+		(char *) &((struct sockaddr_in *) res->ai_addr)->sin_addr :
+		(char *) &((struct sockaddr_in6 *) res->ai_addr)->sin6_addr);
+	if (inet_ntop(res->ai_family, addr, hostbuf, sizeof(hostbuf)) == 0) {
+	    perror("inet_ntop:");
+	    exit(1);
+	}
+	printf("Address:\t%s\n", hostbuf);
+    }
+    freeaddrinfo(res0);
+    exit(0);
+}