<![CDATA[
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>
int main __P((int, char **));
int
main(argc, argv)
int argc;
char **argv;
{
struct addrinfo hints, *hp;
struct servent *sp;
unsigned long lport;
u_int16_t port;
char *ep;
int dstlen;
size_t l;
int s;
char buf[1024];
char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
/* 引数の数をチェック */
if (argc != 3) {
fprintf(stderr, "usage: test host port\n");
exit(1);
/*NOTREACHED*/
}
/* アドレスをバイナリに変換 */
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
getaddrinfo(argv[1], argv[2], &hints, &hp);
if (!hp) {
fprintf(stderr, "%s: %s\n", argv[1], hstrerror(h_errno));
exit(1);
/*NOTREACHED*/
}
/* ポート番号をバイナリに変換 */
sp = getservbyname(argv[2], "TCP");
if (sp) {
port = sp->s_port & 0xffff;
} else {
ep = NULL;
errno = 0;
lport = strtoul(argv[2], &ep, 10);
if (!*argv[2] || errno || !ep || *ep) {
fprintf(stderr, "%s: no such service\n", argv[2]);
exit(1);
/*NOTREACHED*/
}
if (lport & ~0xffff) {
fprintf(stderr, "%s: out of range\n", argv[2]);
exit(1);
/*NOTREACHED*/
}
port = htons(lport & 0xffff);
}
endservent();
s = socket(hp->ai_family, hp->ai_socktype, hp->ai_protocol);
if (s < 0) {
perror("socket");
exit(1);
/*NOTREACHED*/
}
getnameinfo(hp->ai_addr, hp->ai_addrlen, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV);
fprintf(stderr, "trying %s port %u\n", hbuf, ntohs(port));
if (connect(s, hp->ai_addr, hp->ai_addrlen) < 0) {
perror("connect");
exit(1);
/*NOTREACHED*/
}
while ((l = read(s, buf, sizeof(buf))) > 0)
write(STDOUT_FILENO, buf, l);
close(s);
exit(0);
/*NOTREACHED*/
}
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