diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/host.c | 55 |
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); +} |