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/* @(#)tcpd.c 1.6 2003/12/29 Connectathon Testsuite */
/*
* server for simple tcp ping program.
* listens on socket for connection request, then echos back
* request from client.
*/
#define TCP_PORT 3456
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
static void
xxit(s)
char *s;
{
perror(s);
exit(1);
}
/*ARGSUSED*/
int
main(argc, argv)
int argc;
char **argv;
{
int s, ns; /* sockets */
struct sockaddr_in addr; /* socket address */
int ret;
#ifdef HAVE_SOCKLEN_T
socklen_t addrlen = sizeof(struct sockaddr_in);
#else
size_t addrlen = sizeof(struct sockaddr_in);
#endif
struct hostent *hp;
char buf[BUFSIZ];
if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
xxit("socket");
addr.sin_family = AF_INET;
addr.sin_port = htons(TCP_PORT);
addr.sin_addr.s_addr = INADDR_ANY;
if (bind(s, (struct sockaddr *)&addr, addrlen) < 0)
xxit("bind");
if (listen(s, 5) < 0)
xxit("listen");
while(1) {
fprintf(stderr, "%s awaiting accept\n", argv[0]);
addrlen = sizeof(struct sockaddr_in);
if ((ns = accept(s, (struct sockaddr *)&addr, &addrlen)) < 0)
xxit("accept");
#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 connection from host %s\n", argv[0], hp->h_name);
else
fprintf(stderr, "\
%s: accepted connection from host %x\n", argv[0], addr.sin_addr.s_addr);
ret = read(ns, buf, BUFSIZ);
fprintf(stderr, " read ret %d\n", ret);
if (ret > 0) {
*buf = *buf + 1;
ret = write(ns, buf, ret);
fprintf(stderr, " write ret %d\n", ret);
}
sleep(5);
close(ns);
}
}
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