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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 19:59:03 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 19:59:03 +0000
commita848231ae0f346dc7cc000973fbeb65b0894ee92 (patch)
tree44b60b367c86723cc78383ef247885d72b388afe /auxiliary/name-addr-test/getnameinfo.c
parentInitial commit. (diff)
downloadpostfix-a848231ae0f346dc7cc000973fbeb65b0894ee92.tar.xz
postfix-a848231ae0f346dc7cc000973fbeb65b0894ee92.zip
Adding upstream version 3.8.5.upstream/3.8.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'auxiliary/name-addr-test/getnameinfo.c')
-rw-r--r--auxiliary/name-addr-test/getnameinfo.c79
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);
+}