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#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <errno.h>
#include <ctype.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
main(argc, argv)
int argc;
char *argv[];
{
struct hostent *hostp;
struct servent *servp;
struct sockaddr_in server;
int sock;
static struct timeval timeout = { 5, 0 }; /* five seconds */
fd_set rmask, xmask, mask;
char buf[BUFSIZ];
int nfound, bytesread;
if (argc != 3) {
(void) fprintf(stderr,"usage: %s service host\n",argv[0]);
exit(1);
}
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
perror("socket");
exit(1);
}
if (isdigit(argv[1][0])) {
static struct servent s;
servp = &s;
s.s_port = htons((u_short)atoi(argv[1]));
} else if ((servp = getservbyname(argv[1], "tcp")) == 0) {
fprintf(stderr,"%s: unknown service\n",argv[1]);
exit(1);
}
if ((hostp = gethostbyname(argv[2])) == 0) {
fprintf(stderr,"%s: unknown host\n",argv[2]);
exit(1);
}
memset((void *) &server, 0, sizeof server);
server.sin_family = AF_INET;
memcpy((void *) &server.sin_addr, hostp->h_addr, hostp->h_length);
server.sin_port = servp->s_port;
if (connect(sock, (struct sockaddr *) &server, sizeof server) < 0) {
(void) close(sock);
perror("connect");
exit(1);
}
FD_ZERO(&mask);
FD_SET(sock, &mask);
FD_SET(fileno(stdin), &mask);
for (;;) {
rmask = mask;
nfound = select(FD_SETSIZE, &rmask, (fd_set *)0, (fd_set *)0, &timeout);
if (nfound < 0) {
if (errno == EINTR) {
printf("interrupted system call\n");
continue;
}
/* something is very wrong! */
perror("select");
exit(1);
}
if (nfound == 0) {
/* timer expired */
printf("Please type something!\n");
continue;
}
if (FD_ISSET(fileno(stdin), &rmask)) {
/* data from keyboard */
if (!fgets(buf, sizeof buf, stdin)) {
if (ferror(stdin)) {
perror("stdin");
exit(1);
}
exit(0);
}
if (write(sock, buf, strlen(buf)) < 0) {
perror("write");
exit(1);
}
}
if (FD_ISSET(sock,&rmask)) {
/* data from network */
bytesread = read(sock, buf, sizeof buf);
buf[bytesread] = '\0';
printf("%s: got %d bytes: %s\n", argv[0], bytesread, buf);
}
}
} /* main - client.c */
8.2. server.c
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <ctype.h >
#include <errno.h>
#include <stdio.h>
main(argc, argv)
int argc;
char *argv[];
{
struct servent *servp;
struct sockaddr_in server, remote;
int request_sock, new_sock;
int nfound, fd, maxfd, bytesread, addrlen;
fd_set rmask, mask;
static struct timeval timeout = { 0, 500000 }; /* one half second */
char buf[BUFSIZ];
if (argc != 2) {
(void) fprintf(stderr,"usage: %s service\n",argv[0]);
exit(1);
}
if ((request_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
perror("socket");
exit(1);
}
if (isdigit(argv[1][0])) {
static struct servent s;
servp = &s;
s.s_port = htons((u_short)atoi(argv[1]));
} else if ((servp = getservbyname(argv[1], "tcp")) == 0) {
fprintf(stderr,"%s: unknown service\n");
exit(1);
}
memset((void *) &server, sizeof server);
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = servp->s_port;
if (bind(request_sock, (struct sockaddr *) &server, sizeof server) < 0) {
perror("bind");
exit(1);
}
if (listen(request_sock, SOMAXCONN) < 0) {
perror("listen");
exit(1);
}
FD_ZERO(&mask);
FD_SET(request_sock, &mask);
maxfd = request_sock;
for (;;) {
rmask = mask;
nfound = select(maxfd + 1, &rmask, (fd_set *)0, (fd_set *)0, &timeout);
if (nfound < 0) {
if (errno == EINTR) {
printf("interrupted system call\n");
continue;
}
/* something is very wrong! */
perror("select");
exit(1);
}
if (nfound == 0) {
/* timeout */
printf(".");
fflush(stdout);
continue;
}
if (FD_ISSET(request_sock, &rmask)) {
/* a new connection is available on the connetion socket */
addrlen = sizeof(remote);
new_sock = accept(request_sock, (struct sockaddr *)&remote, &addrlen);
if (new_sock < 0) {
perror("accept");
exit(1);
}
printf("connection from host %s, port %d, socket %d\n",
inet_ntoa(remote.sin_addr), ntohs(remote.sin_port), new_sock);
FD_SET(new_sock, &mask);
if (new_sock > maxfd) maxfd = new_sock;
FD_CLR(request_sock, &rmask);
}
for (fd = 0; fd <= maxfd ; fd++) {
/* look for other sockets that have data available */
if (FD_ISSET(fd, &rmask)) {
/* process the data */
bytesread = read(fd, buf, sizeof buf - 1);
if (bytesread < 0) {
perror("read");
/* fall through */
}
if (bytesread <= 0) {
printf("server: end of file on %d\n",fd);
FD_CLR(fd, &mask);
if (close(fd)) perror("close");
continue;
}
buf[bytesread] = '\0';
printf("%s: %d bytes from %d: %s\n", argv[0], bytesread, fd, buf);
/* echo it back */
if (write(fd, buf, bytesread) != bytesread) perror("echo");
}
}
}
} /* main - server.c */
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