X-Git-Url: https://gapil.gnulinux.it/gitweb/?a=blobdiff_plain;f=listati%2FTCP_echod.c;fp=listati%2FTCP_echod.c;h=81085a7b5f59f831291723a6561475e6aaf624f5;hb=7444bbe1f4d1e9858693bfcb41921fa601450a89;hp=0000000000000000000000000000000000000000;hpb=626fee850ef998ab730a6da711494d6a5ace1be5;p=gapil.git

diff --git a/listati/TCP_echod.c b/listati/TCP_echod.c
new file mode 100644
index 0000000..81085a7
--- /dev/null
+++ b/listati/TCP_echod.c
@@ -0,0 +1,60 @@
+int main(int argc, char *argv[])
+{
+    int list_fd, conn_fd; 
+    pid_t pid;
+    struct sockaddr_in serv_add;
+    ...
+    /* create socket */
+    if ( (list_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+	perror("Socket creation error");
+	exit(1);
+    }
+    /* initialize address and bind socket */
+    memset((void *)&serv_add, 0, sizeof(serv_add)); /* clear server address */
+    serv_add.sin_family = AF_INET;                  /* address type is INET */
+    serv_add.sin_port = htons(7);                   /* echo port is 7 */
+    serv_add.sin_addr.s_addr = htonl(INADDR_ANY);   /* connect from anywhere */
+    if (bind(list_fd, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
+	perror("bind error");
+	exit(1);
+    }
+    /* give away privileges and go daemon */
+    if (setgid(65534) !=0) { /* first give away group privileges */
+	perror("cannot give away group privileges");
+	exit(1);
+    }
+    if (setuid(65534) !=0) { /* and only after user ... */
+	perror("cannot give away user privileges");
+	exit(1);
+    }
+    if (demonize) {          /* go daemon */
+        openlog(argv[0], 0, LOG_DAEMON); /* open logging */
+ 	if (daemon(0, 0) != 0) {
+	    perror("cannot start as daemon");
+	    exit(1);
+	}
+    }
+    /* main body */
+    if (listen(list_fd, BACKLOG) < 0 ) { /* listen on socket */
+	PrintErr("listen error");
+	exit(1);
+    }
+    while (1) {                          /* handle echo to client */
+	if ( (conn_fd = accept(list_fd, NULL, NULL)) < 0) { 
+	    PrintErr("accept error");
+	    exit(1);
+	}
+	if ( (pid = fork()) < 0 ) { 	 /* fork to handle connection */
+	    PrintErr("fork error");
+	    exit(1);
+	}
+	if (pid == 0) {      /* child */
+	    close(list_fd);          /* close listening socket */   
+	    ServEcho(conn_fd);       /* handle echo */
+	    exit(0);
+	} else {             /* parent */
+	    close(conn_fd);          /* close connected socket */
+	}
+    }
+    exit(0);     /* normal exit, never reached */
+}