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authorDaniel Friesel <derf@derf.homelinux.org>2009-08-08 13:38:48 +0200
committerDaniel Friesel <derf@derf.homelinux.org>2009-08-08 13:38:48 +0200
commita36d4dc482a899cf821f57c30fe7a08433e21ac5 (patch)
tree690930311a8fb2ae44e1cd28095571b840f315dc /src
Initial commit
Diffstat (limited to 'src')
-rw-r--r--src/host.c55
1 files changed, 55 insertions, 0 deletions
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);
+}