1 int main(int argc, char *argv[])
5 struct sockaddr_in serv_add;
7 /* create and init socket */
8 if ( (list_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
9 perror("Socket creation error");
12 memset((void *)&serv_add, 0, sizeof(serv_add)); /* clear server address */
13 serv_add.sin_family = AF_INET; /* address type is INET */
14 serv_add.sin_port = htons(7); /* echo port is 7 */
15 serv_add.sin_addr.s_addr = htonl(INADDR_ANY); /* connect from anywhere */
16 if (bind(list_fd, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
20 /* give away privileges and go daemon */
21 if (setgid(65534) !=0) { /* first give away group privileges */
22 perror("cannot give away group privileges");
25 if (setuid(65534) !=0) { /* and only after user ... */
26 perror("cannot give away user privileges");
29 if (demonize) { /* go daemon */
30 openlog(argv[0], 0, LOG_DAEMON); /* open logging */
31 if (daemon(0, 0) != 0) {
32 perror("cannot start as daemon");
37 if (listen(list_fd, BACKLOG) < 0 ) { /* listen on socket */
38 PrintErr("listen error");
41 while (1) { /* handle echo to client */
42 len = sizeof(cli_add);
43 if ( (conn_fd = accept(list_fd, NULL, NULL)) < 0) {
44 PrintErr("accept error");
47 if ( (pid = fork()) < 0 ) { /* fork to handle connection */
48 PrintErr("fork error");
51 if (pid == 0) { /* child */
52 close(list_fd); /* close listening socket */
53 ServEcho(conn_fd); /* handle echo */
56 close(conn_fd); /* close connected socket */
59 exit(0); /* normal exit, never reached */