TELNET server and client.

Author: larsbrinkhoff

.gitignore

@@ -5,4 +5,6 @@ src/libncp.a
 src/ping
 src/finger
 src/finser
+src/telnet
+src/telser
 test/*.log

src/Makefile

@@ -2,7 +2,7 @@ CFLAGS=-g -Wall
 
 NCP=-L. -lncp
 
-all: ncp ping finger finser
+all: ncp ping finger finser telnet telser
 
 ncp: ncp.o imp.o
 
@@ -18,3 +18,9 @@ finger: finger.o libncp.a
 
 finser: finser.o libncp.a
 	$(CC) -o $@ $< $(NCP)
+
+telnet: telnet.o libncp.a
+	$(CC) -o $@ $< $(NCP)
+
+telser: telser.o libncp.a
+	$(CC) -o $@ $< $(NCP)

src/telnet.c

@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include "ncp.h"
+
+int main (int argc, char **argv)
+{
+  char *command;
+  char reply[1000];
+  int host, connection, size;
+
+  if (argc != 2) {
+    fprintf (stderr, "Usage: %s host\n", argv[0]);
+    exit (1);
+  }
+
+  host = atoi (argv[1]);
+
+  if (ncp_init (NULL) == -1) {
+    fprintf (stderr, "NCP initializtion error: %s.\n", strerror (errno));
+    if (errno == ECONNREFUSED)
+      fprintf (stderr, "Is the NCP server started?\n");
+    exit (1);
+  }
+
+  printf ("TELNET to host %03o.\n", host);
+
+  switch (ncp_open (host, 23, &connection)) {
+  case 0:
+    break;
+  case -1:
+  default:
+    fprintf (stderr, "NCP open error.\n");
+    exit (1);
+  case -2:
+    fprintf (stderr, "Open refused.\n");
+    exit (1);
+  }
+
+  if (ncp_close (connection) == -1) {
+    fprintf (stderr, "NCP close error.\n");
+    exit (1);
+  }
+}

src/telser.c

@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include "ncp.h"
+
+int main (int argc, char **argv)
+{
+  char command[1000];
+  char reply[1000];
+  int host, connection, size;
+
+  if (argc != 1) {
+    fprintf (stderr, "Usage: %s\n", argv[0]);
+    exit (1);
+  }
+
+  if (ncp_init (NULL) == -1) {
+    fprintf (stderr, "NCP initializtion error: %s.\n", strerror (errno));
+    if (errno == ECONNREFUSED)
+      fprintf (stderr, "Is the NCP server started?\n");
+    exit (1);
+  }
+
+  if (ncp_listen (23, &host, &connection) == -1) {
+    fprintf (stderr, "NCP listen error.\n");
+    exit (1);
+  }
+
+  if (ncp_close (connection) == -1) {
+    fprintf (stderr, "NCP close error.\n");
+    exit (1);
+  }
+
+}