Adding upstream version 4.9.0.upstream/4.9.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 578 insertions, 0 deletions

diff --git a/teln.c b/teln.c
new file mode 100644
index 0000000..ff18bf7
--- /dev/null
+++ b/teln.c
@@ -0,0 +1,578 @@
+/* Copyright (c) 2008, 2009
+ *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
+ *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
+ *      Micah Cowan (micah@cowan.name)
+ *      Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
+ * Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
+ *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
+ *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
+ * Copyright (c) 1987 Oliver Laumann
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING); if not, see
+ * https://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
+ *
+ ****************************************************************
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <stdio.h>
+
+#include "config.h"
+
+#ifdef BUILTIN_TELNET
+
+#include "screen.h"
+#include "extern.h"
+
+extern struct win *fore;
+extern struct layer *flayer;
+extern int visual_bell;
+extern char screenterm[];
+extern int af;
+
+static void TelReply __P((struct win *, char *, int));
+static void TelDocmd __P((struct win *, int, int));
+static void TelDosub __P((struct win *));
+
+// why TEL_DEFPORT has "
+#define TEL_DEFPORT     "23"
+#define TEL_CONNECTING	(-2)
+
+#define TC_IAC          255
+#define TC_DONT         254
+#define TC_DO           253
+#define TC_WONT         252
+#define TC_WILL         251
+#define TC_SB           250
+#define TC_BREAK        243
+#define TC_SE           240
+
+#define TC_S "S  b      swWdDc"
+
+#define TO_BINARY       0
+#define TO_ECHO         1
+#define TO_SGA          3
+#define TO_TM           6
+#define TO_TTYPE        24
+#define TO_NAWS         31
+#define TO_TSPEED       32
+#define TO_LFLOW        33
+#define TO_LINEMODE     34
+#define TO_XDISPLOC     35
+#define TO_NEWENV       39
+
+#define TO_S "be c                    t      wsf xE  E"
+
+
+static unsigned char tn_init[] = {
+  TC_IAC, TC_DO, TO_SGA,
+  TC_IAC, TC_WILL, TO_TTYPE,
+  TC_IAC, TC_WILL, TO_NAWS,
+  TC_IAC, TC_WILL, TO_LFLOW,
+};
+
+static void
+tel_connev_fn(ev, data)
+struct event *ev;
+char *data;
+{
+  struct win *p = (struct win *)data;
+  if (connect(p->w_ptyfd, (struct sockaddr *)&p->w_telsa, sizeof(p->w_telsa)) && errno != EISCONN)
+    {
+      char buf[1024];
+      buf[0] = ' ';
+      strncpy(buf + 1, strerror(errno), sizeof(buf) - 2);
+      buf[sizeof(buf) - 1] = 0;
+      WriteString(p, buf, strlen(buf));
+      WindowDied(p, 0, 0);
+      return;
+    }
+  WriteString(p, "connected.\r\n", 12);
+  evdeq(&p->w_telconnev);
+  p->w_telstate = 0;
+}
+
+int
+TelOpenAndConnect(struct win *p) {
+	int fd, on = 1;
+	char buf[256];
+
+	struct addrinfo hints, *res0, *res;
+
+	if (!(p->w_cmdargs[1])) {
+		Msg(0, "Usage: screen //telnet host [port]");
+		return -1;
+	}
+
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = af;
+	hints.ai_socktype = SOCK_STREAM;
+	hints.ai_protocol = IPPROTO_TCP;
+
+	if(getaddrinfo(p->w_cmdargs[1], p->w_cmdargs[2] ? p->w_cmdargs[2] : TEL_DEFPORT, &hints, &res0)) {
+		Msg(0, "unknown host: %s", p->w_cmdargs[1]);
+		return -1;
+	}
+
+	for(res = res0; res; res = res->ai_next) {
+		if((fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) == -1) {
+			if(res->ai_next)
+				continue;
+			else {
+				Msg(errno, "TelOpenAndConnect: socket");
+				freeaddrinfo(res0);
+				return -1;
+			}
+		}
+
+		if (setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)))
+			Msg(errno, "TelOpenAndConnect: setsockopt SO_OOBINLINE");
+
+		if (p->w_cmdargs[2] && strcmp(p->w_cmdargs[2], TEL_DEFPORT))
+			snprintf(buf, 256, "Trying %s %s...", p->w_cmdargs[1], p->w_cmdargs[2]);
+		else
+			snprintf(buf, 256, "Trying %s...", p->w_cmdargs[1]);
+
+		WriteString(p, buf, strlen(buf));
+		if (connect(fd, res->ai_addr, res->ai_addrlen)) {
+			if (errno == EINPROGRESS) {
+				p->w_telstate = TEL_CONNECTING;
+				p->w_telconnev.fd = fd;
+				p->w_telconnev.handler = tel_connev_fn;
+				p->w_telconnev.data = (char *)p;
+				p->w_telconnev.type = EV_WRITE;
+				p->w_telconnev.pri = 1;
+				debug("telnet connect in progress...\n");
+				evenq(&p->w_telconnev);
+			}
+			else {
+				close(fd);
+				if(res->ai_next)
+					continue;
+				else {
+					Msg(errno, "TelOpenAndConnect: connect");
+					freeaddrinfo(res0);
+					return -1;
+				}
+			}
+		}
+		else
+			WriteString(p, "connected.\r\n", 12);
+
+		if (!(p->w_cmdargs[2] && strcmp(p->w_cmdargs[2], TEL_DEFPORT)))
+			TelReply(p, (char *)tn_init, sizeof(tn_init));
+
+		p->w_ptyfd = fd;
+		memcpy(&p->w_telsa, &res->ai_addr, sizeof(res->ai_addr));
+		freeaddrinfo(res0);
+		return 0;
+	}
+	return -1;
+}
+
+int
+TelIsline(p)
+struct win *p;
+{
+  return !fore->w_telropts[TO_SGA];
+}
+
+void
+TelProcessLine(bufpp, lenp)
+char **bufpp;
+int *lenp;
+{
+  int echo = !fore->w_telropts[TO_ECHO];
+  unsigned char c;
+  char *tb;
+  int tl;
+
+  char *buf = *bufpp;
+  int l = *lenp;
+  while (l--)
+    {
+      c = *(unsigned char *)buf++;
+      if (fore->w_telbufl + 2 >= IOSIZE)
+	{
+	  WBell(fore, visual_bell);
+	  continue;
+	}
+      if (c == '\r')
+	{
+	  if (echo)
+	    WriteString(fore, "\r\n", 2);
+	  fore->w_telbuf[fore->w_telbufl++] = '\r';
+	  fore->w_telbuf[fore->w_telbufl++] = '\n';
+	  tb = fore->w_telbuf;
+	  tl = fore->w_telbufl;
+	  LayProcess(&tb, &tl);
+	  fore->w_telbufl = 0;
+	  continue;
+	}
+      if (c == '\b' && fore->w_telbufl > 0)
+	{
+	  if (echo)
+	    {
+	      WriteString(fore, (char *)&c, 1);
+	      WriteString(fore, " ", 1);
+	      WriteString(fore, (char *)&c, 1);
+	    }
+	  fore->w_telbufl--;
+	}
+      if ((c >= 0x20 && c <= 0x7e) || c >= 0xa0)
+	{
+	  if (echo)
+	    WriteString(fore, (char *)&c, 1);
+	  fore->w_telbuf[fore->w_telbufl++] = c;
+	}
+    }
+  *lenp = 0;
+}
+
+int
+DoTelnet(buf, lenp, f)
+char *buf;
+int *lenp;
+int f;
+{
+  int echo = !fore->w_telropts[TO_ECHO];
+  int cmode = fore->w_telropts[TO_SGA];
+  int bin = fore->w_telropts[TO_BINARY];
+  char *p = buf, *sbuf;
+  int trunc = 0;
+  int c;
+  int l = *lenp;
+
+  sbuf = p;
+  while (l-- > 0)
+    {
+      c = *(unsigned char *)p++;
+      if (c == TC_IAC || (c == '\r' && (l ==0 || *p != '\n') && cmode && !bin))
+	{
+	  if (cmode && echo)
+	    {
+	      WriteString(fore, sbuf, p - sbuf);
+	      sbuf = p;
+	    }
+	  if (f-- <= 0)
+	    {
+	      trunc++;
+	      l--;
+	    }
+	  if (l < 0)
+	    {
+	      p--;	/* drop char */
+	      break;
+	    }
+	  if (l)
+	    bcopy(p, p + 1, l);
+	  if (c == TC_IAC)
+	    *p++ = c;
+	  else if (c == '\r')
+	    *p++ = 0;
+	  else if (c == '\n')
+	    {
+	      p[-1] = '\r';
+	      *p++ = '\n';
+	    }
+	}
+    }
+  *lenp = p - buf;
+  return trunc;
+}
+
+/* modifies data in-place, returns new length */
+int
+TelIn(p, buf, len, free)
+struct win *p;
+char *buf;
+int len;
+int free;
+{
+  char *rp, *wp;
+  int c;
+
+  rp = wp = buf;
+  while (len-- > 0)
+    {
+      c = *(unsigned char *)rp++;
+
+      if (p->w_telstate >= TC_WILL && p->w_telstate <= TC_DONT)
+	{
+	  TelDocmd(p, p->w_telstate, c);
+	  p->w_telstate = 0;
+	  continue;
+	}
+      if (p->w_telstate == TC_SB || p->w_telstate == TC_SE)
+	{
+	  if (p->w_telstate == TC_SE && c == TC_IAC)
+	    p->w_telsubidx--;
+	  if (p->w_telstate == TC_SE && c == TC_SE)
+	    {
+	      p->w_telsubidx--;
+	      TelDosub(p);
+	      p->w_telstate = 0;
+	      continue;
+	    }
+	  if (p->w_telstate == TC_SB && c == TC_IAC)
+	    p->w_telstate = TC_SE;
+	  else
+	    p->w_telstate = TC_SB;
+	  p->w_telsubbuf[p->w_telsubidx] = c;
+	  if (p->w_telsubidx < sizeof(p->w_telsubbuf) - 1)
+	    p->w_telsubidx++;
+	  continue;
+	}
+      if (p->w_telstate == TC_IAC)
+	{
+	  if ((c >= TC_WILL && c <= TC_DONT) || c == TC_SB)
+	    {
+	      p->w_telsubidx = 0;
+	      p->w_telstate = c;
+	      continue;
+	    }
+	  p->w_telstate = 0;
+	  if (c != TC_IAC)
+	    continue;
+	}
+      else if (c == TC_IAC)
+	{
+	  p->w_telstate = c;
+	  continue;
+	}
+      if (p->w_telstate == '\r')
+	{
+	  p->w_telstate = 0;
+	  if (c == 0)
+	    continue;		/* suppress trailing \0 */
+	}
+      else if (c == '\n' && !p->w_telropts[TO_SGA])
+	{
+	  /* oops... simulate terminal line mode: insert \r */
+	  if (wp + 1 == rp)
+	    {
+	      if (free-- > 0)
+		{
+		  if (len)
+		    bcopy(rp, rp + 1, len);
+		  rp++;
+		  *wp++ = '\r';
+		}
+	    }
+	  else
+	    *wp++ = '\r';
+	}
+      if (c == '\r')
+        p->w_telstate = c;
+      *wp++ = c;
+    }
+  return wp - buf;
+}
+
+static void
+TelReply(p, str, len)
+struct win *p;
+char *str;
+int len;
+{
+  if (len <= 0)
+    return;
+  if (p->w_inlen + len > IOSIZE)
+    {
+      Msg(0, "Warning: telnet protocol overrun!");
+      return;
+    }
+  bcopy(str, p->w_inbuf + p->w_inlen, len);
+  p->w_inlen += len;
+}
+
+static void
+TelDocmd(p, cmd, opt)
+struct win *p;
+int cmd, opt;
+{
+  unsigned char b[3];
+  int repl = 0;
+
+  if (cmd == TC_WONT)
+    debug2("[<-WONT %c %d]\n", TO_S[opt], opt);
+  if (cmd == TC_WILL)
+    debug2("[<-WILL %c %d]\n", TO_S[opt], opt);
+  if (cmd == TC_DONT)
+    debug2("[<-DONT %c %d]\n", TO_S[opt], opt);
+  if (cmd == TC_DO)
+    debug2("[<-DO  %c %d]\n", TO_S[opt], opt);
+
+  switch(cmd)
+    {
+    case TC_WILL:
+      if (p->w_telropts[opt] || opt == TO_TM)
+	return;
+      repl = TC_DONT;
+      if (opt == TO_ECHO || opt == TO_SGA || opt == TO_BINARY)
+	{
+	  p->w_telropts[opt] = 1;
+	  /* setcon(); */
+	  repl = TC_DO;
+	}
+      break;
+    case TC_WONT:
+      if (!p->w_telropts[opt] || opt == TO_TM)
+	return;
+      repl = TC_DONT;
+#if 0
+      if (opt == TO_ECHO || opt == TO_SGA)
+	setcon();
+#endif
+      p->w_telropts[opt] = 0;
+      break;
+    case TC_DO:
+      if (p->w_telmopts[opt])
+	return;
+      repl = TC_WONT;
+      if (opt == TO_TTYPE || opt == TO_SGA || opt == TO_BINARY || opt == TO_NAWS || opt == TO_TM || opt == TO_LFLOW)
+	{
+	  repl = TC_WILL;
+	  p->w_telmopts[opt] = 1;
+	}
+      p->w_telmopts[TO_TM] = 0;
+      break;
+    case TC_DONT:
+      if (!p->w_telmopts[opt])
+	return;
+      repl = TC_WONT;
+      p->w_telmopts[opt] = 0;
+      break;
+    }
+  b[0] = TC_IAC;
+  b[1] = repl;
+  b[2] = opt;
+
+  if (repl == TC_WONT)
+    debug2("[->WONT %c %d]\n", TO_S[opt], opt);
+  if (repl == TC_WILL)
+    debug2("[->WILL %c %d]\n", TO_S[opt], opt);
+  if (repl == TC_DONT)
+    debug2("[->DONT %c %d]\n", TO_S[opt], opt);
+  if (repl == TC_DO)
+    debug2("[->DO  %c %d]\n", TO_S[opt], opt);
+
+  TelReply(p, (char *)b, 3);
+  if (cmd == TC_DO && opt == TO_NAWS)
+    TelWindowSize(p);
+}
+
+
+static void
+TelDosub(p)
+struct win *p;
+{
+  char trepl[MAXTERMLEN + 6 + 1];
+  int l;
+
+  switch(p->w_telsubbuf[0])
+    {
+    case TO_TTYPE:
+      if (p->w_telsubidx != 2 || p->w_telsubbuf[1] != 1)
+	return;
+      l = strlen(screenterm);
+      if (l >= MAXTERMLEN)
+	break;
+      sprintf(trepl, "%c%c%c%c%s%c%c", TC_IAC, TC_SB, TO_TTYPE, 0, screenterm, TC_IAC, TC_SE);
+      TelReply(p, trepl, l + 6);
+      break;
+    case TO_LFLOW:
+      if (p->w_telsubidx != 2)
+	return;
+      debug1("[FLOW %d]\r\n", p->w_telsubbuf[1]);
+      break;
+    default:
+      break;
+   }
+}
+
+void
+TelBreak(p)
+struct win *p;
+{
+  static unsigned char tel_break[] = { TC_IAC, TC_BREAK };
+  TelReply(p, (char *)tel_break, 2);
+}
+
+void
+TelWindowSize(p)
+struct win *p;
+{
+  char s[20], trepl[20], *t;
+  int i;
+
+  debug2("TelWindowSize %d %d\n", p->w_width, p->w_height);
+  if (p->w_width == 0 || p->w_height == 0 || !p->w_telmopts[TO_NAWS])
+    return;
+  sprintf(s, "%c%c%c%c%c%c%c%c%c", TC_SB, TC_SB, TO_NAWS, p->w_width / 256, p->w_width & 255, p->w_height / 256, p->w_height & 255, TC_SE, TC_SE);
+  t = trepl;
+  for (i = 0; i < 9; i++)
+    if ((unsigned char)(*t++ = s[i]) == TC_IAC)
+      *t++ = TC_IAC;
+  trepl[0] = TC_IAC;
+  t[-2] = TC_IAC;
+  debug(" - sending");
+  for (i = 0; trepl + i < t; i++)
+    debug1(" %02x", (unsigned char)trepl[i]);
+  debug("\n");
+  TelReply(p, trepl, t - trepl);
+}
+
+static char tc_s[] = TC_S;
+static char to_s[] = TO_S;
+
+void
+TelStatus(p, buf, l)
+struct win *p;
+char *buf;
+int l;
+{
+  int i;
+
+  *buf++ = '[';
+  for (i = 0; to_s[i]; i++)
+    {
+      if (to_s[i] == ' ' || p->w_telmopts[i] == 0)
+	continue;
+      *buf++ = to_s[i];
+    }
+  *buf++ = ':';
+  for (i = 0; to_s[i]; i++)
+    {
+      if (to_s[i] == ' ' || p->w_telropts[i] == 0)
+	continue;
+      *buf++ = to_s[i];
+    }
+  if (p->w_telstate == TEL_CONNECTING)
+    buf[-1] = 'C';
+  else if (p->w_telstate && p->w_telstate != '\r')
+    {
+      *buf++ = ':';
+      *buf++ = tc_s[p->w_telstate - TC_SE];
+    }
+  *buf++ = ']';
+  *buf = 0;
+  return;
+}
+
+#endif /* BUILTIN_TELNET */