Patch from James Zhu, telnetd window resizing support.

diff --git a/networking/telnetd.c b/networking/telnetd.c
index 3d5e8d1..3051cfa 100644 (file)
--- a/networking/telnetd.c
+++ b/networking/telnetd.c
@@ -1,4 +1,4 @@
-/* $Id: telnetd.c,v 1.9 2003/12/19 11:30:13 andersen Exp $
+/* $Id: telnetd.c,v 1.10 2004/02/22 09:45:57 bug1 Exp $
  *
  * Simple telnet server
  * Bjorn Wesen, Axis Communications AB (bjornw@axis.com)
@@ -27,6 +27,7 @@
 #include <sys/time.h>
 #include <sys/socket.h>
 #include <sys/wait.h>
+#include <sys/ioctl.h>
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -140,20 +141,36 @@ remove_iacs(struct tsession *ts, int *pnum_totty) {
                                ptr++;
                }
                else {
-                       if ((ptr+2) < end) {
-                       /* the entire IAC is contained in the buffer
-                       we were asked to process. */
-#ifdef DEBUG
-                               fprintf(stderr, "Ignoring IAC %s,%s\n",
-                                   *ptr, TELCMD(*(ptr+1)), TELOPT(*(ptr+2)));
-#endif
-                               ptr += 3;
-                       } else {
+                       /*
+                        * TELOPT_NAWS support!
+                        */
+                       if ((ptr+2) >= end) {
                                /* only the beginning of the IAC is in the
                                buffer we were asked to process, we can't
                                process this char. */
                                break;
                        }
+
+                       /*
+                        * IAC -> SB -> TELOPT_NAWS -> 4-byte -> IAC -> SE
+                        */
+                       else if (ptr[1] == SB && ptr[2] == TELOPT_NAWS) {
+                               struct winsize ws;
+                               if ((ptr+8) >= end)
+                                       break;  /* incomplete, can't process */
+                               ws.ws_col = (ptr[3] << 8) | ptr[4];
+                               ws.ws_row = (ptr[5] << 8) | ptr[6];
+                               (void) ioctl(ts->ptyfd, TIOCSWINSZ, (char *)&ws);
+                               ptr += 9;
+                       }
+                       else {
+                               /* skip 3-byte IAC non-SB cmd */
+#ifdef DEBUG
+                               fprintf(stderr, "Ignoring IAC %s,%s\n",
+                                       TELCMD(*(ptr+1)), TELOPT(*(ptr+2)));
+#endif
+                               ptr += 3;
+                       }
                }
        }
 
@@ -268,6 +285,7 @@ make_new_session(int sockfd)
         */
 
        send_iac(ts, DO, TELOPT_ECHO);
+       send_iac(ts, DO, TELOPT_NAWS);
        send_iac(ts, DO, TELOPT_LFLOW);
        send_iac(ts, WILL, TELOPT_ECHO);
        send_iac(ts, WILL, TELOPT_SGA);