From a36d4dc482a899cf821f57c30fe7a08433e21ac5 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@derf.homelinux.org>
Date: Sat, 8 Aug 2009 13:38:48 +0200
Subject: Initial commit

---
 .gitignore |  1 +
 Makefile   | 20 ++++++++++++++++++++
 src/host.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 76 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 src/host.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ae3c172
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/bin/
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..48baef2
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,20 @@
+CFLAGS = -Wall -Wextra -pedantic -O2
+prefix = /usr/local
+
+all: bin/host
+
+bin/%: src/%.c
+	$(CC) $(CFLAGS) -o $@ $<
+
+install: bin/host
+	mkdir -p $(prefix)/bin
+	cp bin/host $(prefix)/bin/host
+	chmod 755 $(prefix)/bin/host
+
+uninstall:
+	rm -f $(prefix)/bin/host
+
+clean:
+	rm -f bin/host
+
+.PHONY: all install uninstall clean
diff --git a/src/host.c b/src/host.c
new file mode 100644
index 0000000..5ec05ef
--- /dev/null
+++ b/src/host.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright © 2009 by Daniel Friesel <derf@derf.homelinux.org>
+ * License: WTFPL <http://sam.zoy.org/wtfpl>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+
+int main(int argc, char **argv) {
+	struct addrinfo hints = { 0, AF_UNSPEC, SOCK_DGRAM, 0, 0, NULL, NULL, NULL };
+	struct addrinfo *result, *address;
+	char hostname[NI_MAXHOST];
+	char ip_address[INET6_ADDRSTRLEN];
+	int ret;
+	struct in_addr addr;
+	void *ptr;
+
+	ret = getaddrinfo(argv[1], NULL, &hints, &result);
+	if (ret != 0) {
+		fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ret));
+		exit(EXIT_FAILURE);
+	}
+
+	for (address = result; address != NULL; address = address->ai_next) {
+		switch (address->ai_family) {
+			case AF_INET:
+				ptr = &((struct sockaddr_in *) address->ai_addr)->sin_addr;
+				break;
+			case AF_INET6:
+				ptr = &((struct sockaddr_in6 *) address->ai_addr)->sin6_addr;
+				break;
+			default:
+				fprintf(stderr, "Unknown address family: %u\n", address->ai_family);
+				goto loop;
+		}
+		if (inet_ntop(address->ai_family, ptr, ip_address, sizeof(ip_address)) == NULL) {
+			perror("inet_ntop");
+			continue;
+		}
+		puts(ip_address);
+		ret = getnameinfo(address->ai_addr, address->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0);
+		if (ret != 0) {
+			fprintf(stderr, "getnameinfo: %s\n", gai_strerror(ret));
+			continue;
+		}
+		puts(hostname);
+loop:;
+	}
+	freeaddrinfo(address);
+	return(EXIT_SUCCESS);
+}
-- 
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