#include "include/apue.h"
#if defined(SOLARIS)
#include <netinet/in.h>
#endif
#include <netdb.h>
#include <arpa/inet.h>
#if defined(BSD)
#include <sys/socket.h>
#include <netinet/in.h>
#endifvoid
print_family(struct addrinfo *aip)
{
printf(" family ");
switch (aip->ai_family) {
case AF_INET:
printf("inet");
break;
case AF_INET6:
printf("inet6");
break;
case AF_UNIX:
printf("unix");
break;
case AF_UNSPEC:
printf("unspecified");
break;
default:
printf("unknown");
}
}void
print_type(struct addrinfo *aip)
{
printf(" type ");
switch (aip->ai_socktype) {
case SOCK_STREAM:
printf("stream");
break;
case SOCK_DGRAM:
printf("datagram");
break;
case SOCK_SEQPACKET:
printf("seqpacket");
break;
case SOCK_RAW:
printf("raw");
break;
default:
printf("unknown (%d)",aip->ai_socktype);
}
}void
print_protocol(struct addrinfo *aip)
{
printf(" protocol ");
switch (aip->ai_protocol) {
case 0:
printf("default");
break;
case IPPROTO_TCP:
printf("TCP");
break;
case IPPROTO_UDP:
printf("UDP");
break;
case IPPROTO_RAW:
printf("raw");
break;
default:
printf("unknown (%d)",aip->ai_protocol);
}
}void
print_flags(struct addrinfo *aip)
{
printf("flags");
if (aip->ai_flags == 0) {
printf(" 0");
} else {
if (aip->ai_flags & AI_PASSIVE)
printf(" passive");
if (aip->ai_flags & AI_CANONNAME)
printf(" canon");
if (aip->ai_flags & AI_NUMERICHOST)
printf(" numhost");
if (aip->ai_flags & AI_NUMERICSERV)
printf(" numserv");
if (aip->ai_flags & AI_V4MAPPED)
printf(" v4mapped");
if (aip->ai_flags & AI_ALL)
printf(" all");
}
}int
main(int argc,char *argv[])
{
struct addrinfo *ailist,*aip;
struct addrinfo hint;
struct sockaddr_in *sinp;
const char *addr;
int err;
char abuf[INET_ADDRSTRLEN];if (argc != 3)
err_quit("usage: %s nodename service",argv[0]);
hint.ai_flags = AI_CANONNAME;
hint.ai_family = 0;
hint.ai_socktype = 0;
hint.ai_protocol = 0;
hint.ai_addrlen = 0;
hint.ai_canonname = NULL;
hint.ai_addr = NULL;
hint.ai_next = NULL;
if ((err = getaddrinfo(argv[1],argv[2],&hint,&ailist)) != 0)
err_quit("getaddrinfo error: %s",gai_strerror(err));
for (aip = ailist; aip != NULL; aip = aip->ai_next) {
print_flags(aip);
print_family(aip);
print_type(aip);
print_protocol(aip);
printf("\n\thost %s",aip->ai_canonname?aip->ai_canonname:"-");
if (aip->ai_family == AF_INET) {
sinp = (struct sockaddr_in *)aip->ai_addr;
addr = inet_ntop(AF_INET,&sinp->sin_addr,abuf,
INET_ADDRSTRLEN);
printf(" address %s",addr?addr:"unknown");
printf(" port %d",ntohs(sinp->sin_port));
}
printf("\n");
}
exit(0);
}
结果：
./a.out localhost.localdomain ssh
flags canon family inet6 type stream protocol TCP
host localhost
flags canon family inet6 type datagram protocol UDP
host -
flags canon family inet6 type stream protocol unknown (132)
host -
flags canon family inet6 type seqpacket protocol unknown (132)
host -
flags canon family inet type stream protocol TCP
host - address 127.0.0.1 port 22
flags canon family inet type datagram protocol UDP
host - address 127.0.0.1 port 22
flags canon family inet type stream protocol unknown (132)
host - address 127.0.0.1 port 22
flags canon family inet type seqpacket protocol unknown (132)
host - address 127.0.0.1 port 22
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