64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/*
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* getaddrinfo(3) (name->address lookup) tester.
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*
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* Compile with:
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*
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* cc -o getaddrinfo getaddrinfo.c (BSD, Linux)
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*
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* cc -o getaddrinfo getaddrinfo.c -lsocket -lnsl (SunOS 5.x)
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*
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* Run as: getaddrinfo hostname
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*
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* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
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*
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* Author: Wietse Venema, IBM T.J. Watson Research, USA.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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int main(int argc, char **argv)
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{
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char hostbuf[NI_MAXHOST]; /* XXX */
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struct addrinfo hints;
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struct addrinfo *res0;
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struct addrinfo *res;
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const char *addr;
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int err;
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#define NO_SERVICE ((char *) 0)
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if (argc != 2) {
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fprintf(stderr, "usage: %s hostname\n", argv[0]);
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exit(1);
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}
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memset((char *) &hints, 0, sizeof(hints));
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hints.ai_family = PF_UNSPEC;
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hints.ai_flags = AI_CANONNAME;
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hints.ai_socktype = SOCK_STREAM;
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if ((err = getaddrinfo(argv[1], NO_SERVICE, &hints, &res0)) != 0) {
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fprintf(stderr, "host %s not found: %s\n", argv[1], gai_strerror(err));
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exit(1);
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}
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printf("Hostname:\t%s\n", res0->ai_canonname);
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printf("Addresses:\t");
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for (res = res0; res != 0; res = res->ai_next) {
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addr = (res->ai_family == AF_INET ?
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(char *) &((struct sockaddr_in *) res->ai_addr)->sin_addr :
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(char *) &((struct sockaddr_in6 *) res->ai_addr)->sin6_addr);
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if (inet_ntop(res->ai_family, addr, hostbuf, sizeof(hostbuf)) == 0) {
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perror("inet_ntop:");
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exit(1);
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}
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printf("%s ", hostbuf);
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}
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printf("\n");
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freeaddrinfo(res0);
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exit(0);
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}
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