diff options
Diffstat (limited to '')
-rw-r--r-- | auxiliary/name-addr-test/getaddrinfo.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/auxiliary/name-addr-test/getaddrinfo.c b/auxiliary/name-addr-test/getaddrinfo.c new file mode 100644 index 0000000..275bf59 --- /dev/null +++ b/auxiliary/name-addr-test/getaddrinfo.c @@ -0,0 +1,64 @@ + /* + * getaddrinfo(3) (name->address lookup) tester. + * + * Compile with: + * + * cc -o getaddrinfo getaddrinfo.c (BSD, Linux) + * + * cc -o getaddrinfo getaddrinfo.c -lsocket -lnsl (SunOS 5.x) + * + * Run as: getaddrinfo hostname + * + * 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 *addr; + int err; + +#define NO_SERVICE ((char *) 0) + + if (argc != 2) { + fprintf(stderr, "usage: %s hostname\n", argv[0]); + exit(1); + } + memset((char *) &hints, 0, sizeof(hints)); + hints.ai_family = PF_UNSPEC; + hints.ai_flags = AI_CANONNAME; + hints.ai_socktype = SOCK_STREAM; + if ((err = getaddrinfo(argv[1], NO_SERVICE, &hints, &res0)) != 0) { + fprintf(stderr, "host %s not found: %s\n", argv[1], gai_strerror(err)); + exit(1); + } + printf("Hostname:\t%s\n", res0->ai_canonname); + printf("Addresses:\t"); + for (res = res0; res != 0; res = res->ai_next) { + 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("%s ", hostbuf); + } + printf("\n"); + freeaddrinfo(res0); + exit(0); +} |