1 files changed, 446 insertions, 0 deletions

diff --git a/usr.sbin/ppp/tty.c b/usr.sbin/ppp/tty.c
new file mode 100644
index 000000000000..e2201ece51d5
--- /dev/null
+++ b/usr.sbin/ppp/tty.c
@@ -0,0 +1,446 @@
+/*-
+ * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ *	$Id: tty.c,v 1.10 1999/08/06 20:04:07 brian Exp $
+ */
+
+#include <sys/param.h>
+#include <sys/un.h>
+#if defined(__OpenBSD__) || defined(__NetBSD__)
+#include <sys/ioctl.h>
+#endif
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <sys/uio.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "layer.h"
+#include "defs.h"
+#include "mbuf.h"
+#include "log.h"
+#include "timer.h"
+#include "lqr.h"
+#include "hdlc.h"
+#include "throughput.h"
+#include "fsm.h"
+#include "lcp.h"
+#include "ccp.h"
+#include "link.h"
+#include "async.h"
+#include "descriptor.h"
+#include "physical.h"
+#include "mp.h"
+#include "chat.h"
+#include "auth.h"
+#include "chap.h"
+#include "cbcp.h"
+#include "datalink.h"
+#include "main.h"
+#include "tty.h"
+
+#define	Online(dev)	((dev)->mbits & TIOCM_CD)
+
+struct ttydevice {
+  struct device dev;		/* What struct physical knows about */
+  struct pppTimer Timer;	/* CD checks */
+  int mbits;			/* Current DCD status */
+  int carrier_seconds;		/* seconds before CD is *required* */
+  struct termios ios;		/* To be able to reset from raw mode */
+};
+
+#define device2tty(d) ((d)->type == TTY_DEVICE ? (struct ttydevice *)d : NULL)
+
+int
+tty_DeviceSize(void)
+{
+  return sizeof(struct ttydevice);
+}
+
+/*
+ * tty_Timeout() watches the DCD signal and mentions it if it's status
+ * changes.
+ */
+static void
+tty_Timeout(void *data)
+{
+  struct physical *p = data;
+  struct ttydevice *dev = device2tty(p->handler);
+  int ombits, change;
+
+  timer_Stop(&dev->Timer);
+  dev->Timer.load = SECTICKS;		/* Once a second please */
+  timer_Start(&dev->Timer);
+  ombits = dev->mbits;
+
+  if (p->fd >= 0) {
+    if (ioctl(p->fd, TIOCMGET, &dev->mbits) < 0) {
+      /* we must be a pty ? */
+      log_Printf(LogDEBUG, "%s: ioctl error (%s)!\n", p->link.name,
+                 strerror(errno));
+      timer_Stop(&dev->Timer);
+      return;
+    }
+  } else
+    dev->mbits = 0;
+
+  if (ombits == -1) {
+    /* First time looking for carrier */
+    if (Online(dev))
+      log_Printf(LogPHASE, "%s: %s: CD detected\n", p->link.name, p->name.full);
+    else if (++dev->carrier_seconds >= p->cfg.cd.delay) {
+      if (p->cfg.cd.required)
+        log_Printf(LogPHASE, "%s: %s: Required CD not detected\n",
+                   p->link.name, p->name.full);
+      else {
+        log_Printf(LogPHASE, "%s: %s doesn't support CD\n",
+                   p->link.name, p->name.full);
+        dev->mbits = TIOCM_CD;		/* Dodgy null-modem cable ? */
+      }
+      timer_Stop(&dev->Timer);
+      /* tty_AwaitCarrier() will notice */
+    } else {
+      /* Keep waiting */
+      log_Printf(LogDEBUG, "%s: %s: Still no carrier (%d/%d)\n",
+                 p->link.name, p->name.full, dev->carrier_seconds,
+                 p->cfg.cd.delay);
+      dev->mbits = -1;
+    }
+  } else {
+    change = ombits ^ dev->mbits;
+    if (change & TIOCM_CD) {
+      if (dev->mbits & TIOCM_CD)
+        log_Printf(LogDEBUG, "%s: offline -> online\n", p->link.name);
+      else {
+        log_Printf(LogDEBUG, "%s: online -> offline\n", p->link.name);
+        log_Printf(LogPHASE, "%s: Carrier lost\n", p->link.name);
+        datalink_Down(p->dl, CLOSE_NORMAL);
+        timer_Stop(&dev->Timer);
+      }
+    } else
+      log_Printf(LogDEBUG, "%s: Still %sline\n", p->link.name,
+                 Online(dev) ? "on" : "off");
+  }
+}
+
+static void
+tty_StartTimer(struct physical *p)
+{
+  struct ttydevice *dev = device2tty(p->handler);
+
+  timer_Stop(&dev->Timer);
+  dev->Timer.load = SECTICKS;
+  dev->Timer.func = tty_Timeout;
+  dev->Timer.name = "tty CD";
+  dev->Timer.arg = p;
+  log_Printf(LogDEBUG, "%s: Using tty_Timeout [%p]\n",
+             p->link.name, tty_Timeout);
+  timer_Start(&dev->Timer);
+}
+
+static int
+tty_AwaitCarrier(struct physical *p)
+{
+  struct ttydevice *dev = device2tty(p->handler);
+
+  if (physical_IsSync(p))
+    return CARRIER_OK;
+
+  if (dev->mbits == -1) {
+    if (dev->Timer.state == TIMER_STOPPED) {
+      dev->carrier_seconds = 0;
+      tty_StartTimer(p);
+    }
+    return CARRIER_PENDING;			/* Not yet ! */
+  }
+
+  return Online(dev) || !p->cfg.cd.required ? CARRIER_OK : CARRIER_LOST;
+}
+
+static int
+tty_Raw(struct physical *p)
+{
+  struct ttydevice *dev = device2tty(p->handler);
+  struct termios ios;
+  int oldflag;
+
+  log_Printf(LogDEBUG, "%s: Entering tty_Raw\n", p->link.name);
+
+  if (p->type != PHYS_DIRECT && p->fd >= 0 && !Online(dev))
+    log_Printf(LogDEBUG, "%s: Raw: descriptor = %d, mbits = %x\n",
+              p->link.name, p->fd, dev->mbits);
+
+  if (!physical_IsSync(p)) {
+    tcgetattr(p->fd, &ios);
+    cfmakeraw(&ios);
+    if (p->cfg.rts_cts)
+      ios.c_cflag |= CLOCAL | CCTS_OFLOW | CRTS_IFLOW;
+    else
+      ios.c_cflag |= CLOCAL;
+
+    if (p->type != PHYS_DEDICATED)
+      ios.c_cflag |= HUPCL;
+
+    tcsetattr(p->fd, TCSANOW, &ios);
+  }
+
+  oldflag = fcntl(p->fd, F_GETFL, 0);
+  if (oldflag < 0)
+    return 0;
+  fcntl(p->fd, F_SETFL, oldflag | O_NONBLOCK);
+
+  return 1;
+}
+
+static void
+tty_Offline(struct physical *p)
+{
+  struct ttydevice *dev = device2tty(p->handler);
+
+  if (p->fd >= 0) {
+    timer_Stop(&dev->Timer);
+    dev->mbits &= ~TIOCM_DTR;	/* XXX: Hmm, what's this supposed to do ? */
+    if (Online(dev)) {
+      struct termios tio;
+
+      tcgetattr(p->fd, &tio);
+      if (cfsetspeed(&tio, B0) == -1)
+        log_Printf(LogWARN, "%s: Unable to set physical to speed 0\n",
+                   p->link.name);
+      else
+        tcsetattr(p->fd, TCSANOW, &tio);
+    }
+  }
+}
+
+static void
+tty_Cooked(struct physical *p)
+{
+  struct ttydevice *dev = device2tty(p->handler);
+  int oldflag;
+
+  tty_Offline(p);	/* In case of emergency close()s */
+
+  tcflush(p->fd, TCIOFLUSH);
+
+  if (!physical_IsSync(p))
+    tcsetattr(p->fd, TCSAFLUSH, &dev->ios);
+
+  if ((oldflag = fcntl(p->fd, F_GETFL, 0)) != -1)
+    fcntl(p->fd, F_SETFL, oldflag & ~O_NONBLOCK);
+}
+
+static void
+tty_StopTimer(struct physical *p)
+{
+  struct ttydevice *dev = device2tty(p->handler);
+
+  timer_Stop(&dev->Timer);
+}
+
+static void
+tty_Free(struct physical *p)
+{
+  struct ttydevice *dev = device2tty(p->handler);
+
+  tty_Offline(p);	/* In case of emergency close()s */
+  free(dev);
+}
+
+static int
+tty_Speed(struct physical *p)
+{
+  struct termios ios;
+
+  if (tcgetattr(p->fd, &ios) == -1)
+    return 0;
+
+  return SpeedToInt(cfgetispeed(&ios));
+}
+
+static const char *
+tty_OpenInfo(struct physical *p)
+{
+  struct ttydevice *dev = device2tty(p->handler);
+  static char buf[13];
+
+  if (Online(dev))
+    strcpy(buf, "with");
+  else
+    strcpy(buf, "no");
+  strcat(buf, " carrier");
+
+  return buf;
+}
+
+static void
+tty_device2iov(struct device *d, struct iovec *iov, int *niov,
+               int maxiov, pid_t newpid)
+{
+  struct ttydevice *dev = device2tty(d);
+  int sz = physical_MaxDeviceSize();
+
+  iov[*niov].iov_base = realloc(d, sz);
+  if (iov[*niov].iov_base == NULL) {
+    log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
+    AbortProgram(EX_OSERR);
+  }
+  iov[*niov].iov_len = sz;
+  (*niov)++;
+
+  if (dev->Timer.state != TIMER_STOPPED) {
+    timer_Stop(&dev->Timer);
+    dev->Timer.state = TIMER_RUNNING;
+  }
+}
+
+static struct device basettydevice = {
+  TTY_DEVICE,
+  "tty",
+  tty_AwaitCarrier,
+  tty_Raw,
+  tty_Offline,
+  tty_Cooked,
+  tty_StopTimer,
+  tty_Free,
+  NULL,
+  NULL,
+  tty_device2iov,
+  tty_Speed,
+  tty_OpenInfo
+};
+
+struct device *
+tty_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
+               int maxiov)
+{
+  if (type == TTY_DEVICE) {
+    struct ttydevice *dev = (struct ttydevice *)iov[(*niov)++].iov_base;
+
+    dev = realloc(dev, sizeof *dev);	/* Reduce to the correct size */
+    if (dev == NULL) {
+      log_Printf(LogALERT, "Failed to allocate memory: %d\n",
+                 (int)(sizeof *dev));
+      AbortProgram(EX_OSERR);
+    }
+
+    /* Refresh function pointers etc */
+    memcpy(&dev->dev, &basettydevice, sizeof dev->dev);
+
+    physical_SetupStack(p, dev->dev.name, PHYSICAL_NOFORCE);
+    if (dev->Timer.state != TIMER_STOPPED) {
+      dev->Timer.state = TIMER_STOPPED;
+      p->handler = &dev->dev;		/* For the benefit of StartTimer */
+      tty_StartTimer(p);
+    }
+    return &dev->dev;
+  }
+
+  return NULL;
+}
+
+struct device *
+tty_Create(struct physical *p)
+{
+  struct ttydevice *dev;
+  struct termios ios;
+  int oldflag;
+
+  if (p->fd < 0 || !isatty(p->fd))
+    /* Don't want this */
+    return NULL;
+
+  if (*p->name.full == '\0') {
+    physical_SetDevice(p, ttyname(p->fd));
+    log_Printf(LogDEBUG, "%s: Input is a tty (%s)\n",
+               p->link.name, p->name.full);
+  } else
+    log_Printf(LogDEBUG, "%s: Opened %s\n", p->link.name, p->name.full);
+
+  /* We're gonna return a ttydevice (unless something goes horribly wrong) */
+
+  if ((dev = malloc(sizeof *dev)) == NULL) {
+    /* Complete failure - parent doesn't continue trying to ``create'' */
+    close(p->fd);
+    p->fd = -1;
+    return NULL;
+  }
+
+  memcpy(&dev->dev, &basettydevice, sizeof dev->dev);
+  memset(&dev->Timer, '\0', sizeof dev->Timer);
+  dev->mbits = -1;
+  tcgetattr(p->fd, &ios);
+  dev->ios = ios;
+
+  log_Printf(LogDEBUG, "%s: tty_Create: physical (get): fd = %d,"
+             " iflag = %lx, oflag = %lx, cflag = %lx\n", p->link.name, p->fd,
+             (u_long)ios.c_iflag, (u_long)ios.c_oflag, (u_long)ios.c_cflag);
+
+  cfmakeraw(&ios);
+  if (p->cfg.rts_cts)
+    ios.c_cflag |= CLOCAL | CCTS_OFLOW | CRTS_IFLOW;
+  else {
+    ios.c_cflag |= CLOCAL;
+    ios.c_iflag |= IXOFF;
+  }
+  ios.c_iflag |= IXON;
+  if (p->type != PHYS_DEDICATED)
+    ios.c_cflag |= HUPCL;
+
+  if (p->type != PHYS_DIRECT) {
+      /* Change tty speed when we're not in -direct mode */
+      ios.c_cflag &= ~(CSIZE | PARODD | PARENB);
+      ios.c_cflag |= p->cfg.parity;
+      if (cfsetspeed(&ios, IntToSpeed(p->cfg.speed)) == -1)
+	log_Printf(LogWARN, "%s: %s: Unable to set speed to %d\n",
+		  p->link.name, p->name.full, p->cfg.speed);
+  }
+  tcsetattr(p->fd, TCSADRAIN, &ios);
+  log_Printf(LogDEBUG, "%s: physical (put): iflag = %lx, oflag = %lx, "
+            "cflag = %lx\n", p->link.name, (u_long)ios.c_iflag,
+            (u_long)ios.c_oflag, (u_long)ios.c_cflag);
+
+  oldflag = fcntl(p->fd, F_GETFL, 0);
+  if (oldflag < 0) {
+    /* Complete failure - parent doesn't continue trying to ``create'' */
+
+    log_Printf(LogWARN, "%s: Open: Cannot get physical flags: %s\n",
+               p->link.name, strerror(errno));
+    tty_Cooked(p);
+    close(p->fd);
+    p->fd = -1;
+    free(dev);
+    return NULL;
+  } else
+    fcntl(p->fd, F_SETFL, oldflag & ~O_NONBLOCK);
+
+  physical_SetupStack(p, dev->dev.name, PHYSICAL_NOFORCE);
+
+  return &dev->dev;
+}