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Diffstat (limited to '')
-rw-r--r-- | auxiliary/name-addr-test/getnameinfo.c | 79 |
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..a270a06 --- /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 ipaddres\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); +} |