72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/* @(#)udpd.c 1.1 97/01/03 Connectathon Testsuite */
|
|
/*
|
|
* server for simple udp ping program.
|
|
* listens on socket for request, then echos back
|
|
* request from client.
|
|
*/
|
|
#define UDP_PORT 3457
|
|
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <netdb.h>
|
|
|
|
main(argc, argv)
|
|
char **argv;
|
|
{
|
|
int s; /* socket */
|
|
struct sockaddr_in addr; /* socket address */
|
|
int ret;
|
|
int addrlen = sizeof(struct sockaddr_in);
|
|
struct hostent *hp;
|
|
char buf[BUFSIZ];
|
|
|
|
if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
|
|
xxit("socket");
|
|
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons(UDP_PORT);
|
|
addr.sin_addr.s_addr = INADDR_ANY;
|
|
|
|
if (bind(s, (struct sockaddr *)&addr, addrlen) < 0)
|
|
xxit("bind");
|
|
|
|
while(1) {
|
|
fprintf(stderr, "%s awaiting request\n", argv[0]);
|
|
addrlen = sizeof(struct sockaddr_in);
|
|
ret = recvfrom(s, buf, BUFSIZ, 0, (struct sockaddr *)&addr,
|
|
&addrlen);
|
|
if (ret < 0)
|
|
xxit("recvfrom");
|
|
#ifdef __STDC__
|
|
if (hp = gethostbyaddr((const char *)&addr.sin_addr,
|
|
sizeof(addr.sin_addr), AF_INET))
|
|
#else
|
|
if (hp = gethostbyaddr(&addr.sin_addr, sizeof(addr.sin_addr),
|
|
AF_INET))
|
|
#endif
|
|
fprintf(stderr, "\
|
|
%s: accepted request from host %s\n", argv[0], hp->h_name);
|
|
else
|
|
fprintf(stderr, "\
|
|
%s: accepted request from host %x\n", argv[0], addr.sin_addr.s_addr);
|
|
|
|
fprintf(stderr, " recvfrom ret %d\n", ret);
|
|
if (ret > 0) {
|
|
*buf = *buf + 1;
|
|
ret = sendto(s, buf, ret, 0, (struct sockaddr *)&addr,
|
|
addrlen);
|
|
fprintf(stderr, " sendto ret %d\n", ret);
|
|
}
|
|
}
|
|
}
|
|
|
|
xxit(s)
|
|
char *s;
|
|
{
|
|
perror(s);
|
|
exit(1);
|
|
}
|
|
|