Patch from James Zhu, telnetd window resizing support.

git-svn-id: svn://busybox.net/trunk/busybox@8543 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 28 insertions, 10 deletions

diff --git a/networking/telnetd.c b/networking/telnetd.c
index 3d5e8d100..3051cfa1e 100644
--- 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);