aboutsummaryrefslogtreecommitdiff
path: root/uip/apps/telnetd/telnetd.c
diff options
context:
space:
mode:
Diffstat (limited to 'uip/apps/telnetd/telnetd.c')
-rw-r--r--uip/apps/telnetd/telnetd.c350
1 files changed, 350 insertions, 0 deletions
diff --git a/uip/apps/telnetd/telnetd.c b/uip/apps/telnetd/telnetd.c
new file mode 100644
index 0000000..7a5ae85
--- /dev/null
+++ b/uip/apps/telnetd/telnetd.c
@@ -0,0 +1,350 @@
+/*
+ * Copyright (c) 2003, Adam Dunkels.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This file is part of the uIP TCP/IP stack
+ *
+ * $Id: telnetd.c,v 1.2 2006/06/07 09:43:54 adam Exp $
+ *
+ */
+
+#include "uip.h"
+#include "telnetd.h"
+#include "memb.h"
+#include "shell.h"
+
+#include <string.h>
+
+#define ISO_nl 0x0a
+#define ISO_cr 0x0d
+
+struct telnetd_line {
+ char line[TELNETD_CONF_LINELEN];
+};
+MEMB(linemem, struct telnetd_line, TELNETD_CONF_NUMLINES);
+
+#define STATE_NORMAL 0
+#define STATE_IAC 1
+#define STATE_WILL 2
+#define STATE_WONT 3
+#define STATE_DO 4
+#define STATE_DONT 5
+#define STATE_CLOSE 6
+
+static struct telnetd_state s;
+
+#define TELNET_IAC 255
+#define TELNET_WILL 251
+#define TELNET_WONT 252
+#define TELNET_DO 253
+#define TELNET_DONT 254
+/*---------------------------------------------------------------------------*/
+static char *
+alloc_line(void)
+{
+ return memb_alloc(&linemem);
+}
+/*---------------------------------------------------------------------------*/
+static void
+dealloc_line(char *line)
+{
+ memb_free(&linemem, line);
+}
+/*---------------------------------------------------------------------------*/
+void
+shell_quit(char *str)
+{
+ s.state = STATE_CLOSE;
+}
+/*---------------------------------------------------------------------------*/
+static void
+sendline(char *line)
+{
+ static unsigned int i;
+
+ for(i = 0; i < TELNETD_CONF_NUMLINES; ++i) {
+ if(s.lines[i] == NULL) {
+ s.lines[i] = line;
+ break;
+ }
+ }
+ if(i == TELNETD_CONF_NUMLINES) {
+ dealloc_line(line);
+ }
+}
+/*---------------------------------------------------------------------------*/
+void
+shell_prompt(char *str)
+{
+ char *line;
+ line = alloc_line();
+ if(line != NULL) {
+ strncpy(line, str, TELNETD_CONF_LINELEN);
+ /* petsciiconv_toascii(line, TELNETD_CONF_LINELEN);*/
+ sendline(line);
+ }
+}
+/*---------------------------------------------------------------------------*/
+void
+shell_output(char *str1, char *str2)
+{
+ static unsigned len;
+ char *line;
+
+ line = alloc_line();
+ if(line != NULL) {
+ len = strlen(str1);
+ strncpy(line, str1, TELNETD_CONF_LINELEN);
+ if(len < TELNETD_CONF_LINELEN) {
+ strncpy(line + len, str2, TELNETD_CONF_LINELEN - len);
+ }
+ len = strlen(line);
+ if(len < TELNETD_CONF_LINELEN - 2) {
+ line[len] = ISO_cr;
+ line[len+1] = ISO_nl;
+ line[len+2] = 0;
+ }
+ /* petsciiconv_toascii(line, TELNETD_CONF_LINELEN);*/
+ sendline(line);
+ }
+}
+/*---------------------------------------------------------------------------*/
+void
+telnetd_init(void)
+{
+ uip_listen(HTONS(23));
+ memb_init(&linemem);
+ shell_init();
+}
+/*---------------------------------------------------------------------------*/
+static void
+acked(void)
+{
+ static unsigned int i;
+
+ while(s.numsent > 0) {
+ dealloc_line(s.lines[0]);
+ for(i = 1; i < TELNETD_CONF_NUMLINES; ++i) {
+ s.lines[i - 1] = s.lines[i];
+ }
+ s.lines[TELNETD_CONF_NUMLINES - 1] = NULL;
+ --s.numsent;
+ }
+}
+/*---------------------------------------------------------------------------*/
+static void
+senddata(void)
+{
+ static char *bufptr, *lineptr;
+ static int buflen, linelen;
+
+ bufptr = uip_appdata;
+ buflen = 0;
+ for(s.numsent = 0; s.numsent < TELNETD_CONF_NUMLINES &&
+ s.lines[s.numsent] != NULL ; ++s.numsent) {
+ lineptr = s.lines[s.numsent];
+ linelen = strlen(lineptr);
+ if(linelen > TELNETD_CONF_LINELEN) {
+ linelen = TELNETD_CONF_LINELEN;
+ }
+ if(buflen + linelen < uip_mss()) {
+ memcpy(bufptr, lineptr, linelen);
+ bufptr += linelen;
+ buflen += linelen;
+ } else {
+ break;
+ }
+ }
+ uip_send(uip_appdata, buflen);
+}
+/*---------------------------------------------------------------------------*/
+static void
+closed(void)
+{
+ static unsigned int i;
+
+ for(i = 0; i < TELNETD_CONF_NUMLINES; ++i) {
+ if(s.lines[i] != NULL) {
+ dealloc_line(s.lines[i]);
+ }
+ }
+}
+/*---------------------------------------------------------------------------*/
+static void
+get_char(u8_t c)
+{
+ if(c == ISO_cr) {
+ return;
+ }
+
+ s.buf[(int)s.bufptr] = c;
+ if(s.buf[(int)s.bufptr] == ISO_nl ||
+ s.bufptr == sizeof(s.buf) - 1) {
+ if(s.bufptr > 0) {
+ s.buf[(int)s.bufptr] = 0;
+ /* petsciiconv_topetscii(s.buf, TELNETD_CONF_LINELEN);*/
+ }
+ shell_input(s.buf);
+ s.bufptr = 0;
+ } else {
+ ++s.bufptr;
+ }
+}
+/*---------------------------------------------------------------------------*/
+static void
+sendopt(u8_t option, u8_t value)
+{
+ char *line;
+ line = alloc_line();
+ if(line != NULL) {
+ line[0] = TELNET_IAC;
+ line[1] = option;
+ line[2] = value;
+ line[3] = 0;
+ sendline(line);
+ }
+}
+/*---------------------------------------------------------------------------*/
+static void
+newdata(void)
+{
+ u16_t len;
+ u8_t c;
+ char *dataptr;
+
+
+ len = uip_datalen();
+ dataptr = (char *)uip_appdata;
+
+ while(len > 0 && s.bufptr < sizeof(s.buf)) {
+ c = *dataptr;
+ ++dataptr;
+ --len;
+ switch(s.state) {
+ case STATE_IAC:
+ if(c == TELNET_IAC) {
+ get_char(c);
+ s.state = STATE_NORMAL;
+ } else {
+ switch(c) {
+ case TELNET_WILL:
+ s.state = STATE_WILL;
+ break;
+ case TELNET_WONT:
+ s.state = STATE_WONT;
+ break;
+ case TELNET_DO:
+ s.state = STATE_DO;
+ break;
+ case TELNET_DONT:
+ s.state = STATE_DONT;
+ break;
+ default:
+ s.state = STATE_NORMAL;
+ break;
+ }
+ }
+ break;
+ case STATE_WILL:
+ /* Reply with a DONT */
+ sendopt(TELNET_DONT, c);
+ s.state = STATE_NORMAL;
+ break;
+
+ case STATE_WONT:
+ /* Reply with a DONT */
+ sendopt(TELNET_DONT, c);
+ s.state = STATE_NORMAL;
+ break;
+ case STATE_DO:
+ /* Reply with a WONT */
+ sendopt(TELNET_WONT, c);
+ s.state = STATE_NORMAL;
+ break;
+ case STATE_DONT:
+ /* Reply with a WONT */
+ sendopt(TELNET_WONT, c);
+ s.state = STATE_NORMAL;
+ break;
+ case STATE_NORMAL:
+ if(c == TELNET_IAC) {
+ s.state = STATE_IAC;
+ } else {
+ get_char(c);
+ }
+ break;
+ }
+
+
+ }
+
+}
+/*---------------------------------------------------------------------------*/
+void
+telnetd_appcall(void)
+{
+ static unsigned int i;
+ if(uip_connected()) {
+ /* tcp_markconn(uip_conn, &s);*/
+ for(i = 0; i < TELNETD_CONF_NUMLINES; ++i) {
+ s.lines[i] = NULL;
+ }
+ s.bufptr = 0;
+ s.state = STATE_NORMAL;
+
+ shell_start();
+ }
+
+ if(s.state == STATE_CLOSE) {
+ s.state = STATE_NORMAL;
+ uip_close();
+ return;
+ }
+
+ if(uip_closed() ||
+ uip_aborted() ||
+ uip_timedout()) {
+ closed();
+ }
+
+ if(uip_acked()) {
+ acked();
+ }
+
+ if(uip_newdata()) {
+ newdata();
+ }
+
+ if(uip_rexmit() ||
+ uip_newdata() ||
+ uip_acked() ||
+ uip_connected() ||
+ uip_poll()) {
+ senddata();
+ }
+}
+/*---------------------------------------------------------------------------*/
generated by cgit v1.2.3 (git 2.26.2) at 2024-06-16 09:34:55 +0000