2 #include <sys/socket.h>
5 #include <netinet/in.h>
15 usage(const char *cmd
)
17 fprintf(stderr
, "%s -4 ip4 -p port [-r]\n", cmd
);
22 main(int argc
, char *argv
[])
24 struct sockaddr_in in
;
25 int s
, opt
, n
, reuseport
;
28 memset(&in
, 0, sizeof(in
));
29 in
.sin_family
= AF_INET
;
33 while ((opt
= getopt(argc
, argv
, "4:p:r")) != -1) {
36 if (inet_pton(AF_INET
, optarg
, &in
.sin_addr
) <= 0)
41 in
.sin_port
= strtol(optarg
, NULL
, 10);
42 in
.sin_port
= htons(in
.sin_port
);
54 if (in
.sin_addr
.s_addr
== INADDR_ANY
|| in
.sin_port
== 0)
57 s
= socket(AF_INET
, SOCK_DGRAM
, 0);
59 err(2, "socket failed");
62 if (setsockopt(s
, SOL_SOCKET
, SO_REUSEPORT
,
63 &reuseport
, sizeof(reuseport
)) < 0)
64 err(2, "setsockopt SO_REUSEPORT failed");
67 n
= sendto(s
, buf
, sizeof(buf
), 0,
68 (const struct sockaddr
*)&in
, sizeof(in
));
70 err(2, "sendto failed");
71 else if (n
!= (int)sizeof(buf
))
72 errx(2, "sent truncated data %d", n
);
74 n
= read(s
, buf
, sizeof(buf
));
76 err(2, "read failed");
77 printf("read %d, done\n", n
);