First steps of the Command Line Interface: I/O routines.

nest/Makefile

-source=rt-table.c rt-fib.c rt-attr.c proto.c iface.c rt-dev.c password.c
+source=rt-table.c rt-fib.c rt-attr.c proto.c iface.c rt-dev.c password.c cli.c
 root-rel=../
 dir-name=nest
 

nest/cli.c

+/*
+ *	BIRD Internet Routing Daemon -- Command-Line Interface
+ *
+ *	(c) 1999 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include "nest/bird.h"
+#include "lib/string.h"
+#include "nest/cli.h"
+
+pool *cli_pool;
+
+void
+cli_printf(cli *c, int code, char *msg, ...)
+{
+  va_list args;
+  byte buf[1024];
+  int flag = (code < 0) ? '-' : ' ';
+  int size;
+  struct cli_out *o;
+
+  va_start(args, msg);
+  if (code < 0)
+    code = -code;
+  bsprintf(buf, "%04d%c", code, flag);
+  size = bvsnprintf(buf+5, sizeof(buf)-6, msg, args);
+  if (size < 0)
+    size = bsprintf(buf, "9999%c<line overflow>", flag);
+  else
+    size += 5;
+  buf[size++] = '\n';
+  if (!(o = c->tx_write) || o->wpos + size > o->end)
+    {
+      o = mb_alloc(c->pool, sizeof(struct cli_out) + CLI_TX_BUF_SIZE);
+      if (c->tx_write)
+	c->tx_write->next = o;
+      else
+	c->tx_buf = o;
+      o->next = NULL;
+      o->wpos = o->outpos = o->buf;
+      o->end = o->buf + CLI_TX_BUF_SIZE;
+      c->tx_write = o;
+    }
+  memcpy(o->wpos, buf, size);
+  o->wpos += size;
+}
+
+static void
+cli_free_out(cli *c)
+{
+  struct cli_out *o, *p;
+
+  if (o = c->tx_buf)
+    {
+      c->tx_write = o;
+      o->wpos = o->outpos = o->buf;
+      while (p = o->next)
+	{
+	  o->next = p->next;
+	  mb_free(p);
+	}
+    }
+}
+
+static int
+cli_flush(cli *c)
+{
+  if (cli_write(c))
+    {
+      cli_free_out(c);
+      return 1;
+    }
+  return 0;
+}
+
+static int
+cli_event(void *data)
+{
+  cli *c = data;
+  int err;
+
+  debug("CLI EVENT\n");
+  if (!c->inited)
+    {
+      c->inited = 1;
+      cli_printf(c, 0, "Welcome!");
+      cli_printf(c, 0, "Here");
+      return cli_flush(c);
+    }
+  err = cli_get_command(c);
+  if (!err)
+    return 0;
+  if (err < 0)
+    debug("CLI CMD ERR\n");
+  else
+    debug("CLI CMD %s\n", c->rx_buf);
+  return 1;
+}
+
+cli *
+cli_new(void *priv)
+{
+  pool *p = rp_new(cli_pool, "CLI");
+  cli *c = mb_alloc(p, sizeof(cli));
+
+  c->pool = p;
+  c->priv = priv;
+  c->event = ev_new(p);
+  c->event->hook = cli_event;
+  c->event->data = c;
+  c->tx_buf = c->tx_pos = c->tx_write = NULL;
+  c->inited = 0;
+  cli_kick(c);
+  return c;
+}
+
+void
+cli_kick(cli *c)
+{
+  debug("CLI KICK\n");
+  ev_schedule(c->event);
+}
+
+void
+cli_written(cli *c)
+{
+  debug("CLI WRITTEN\n");
+  cli_free_out(c);
+  cli_kick(c);
+}
+
+void
+cli_free(cli *c)
+{
+  rfree(c->pool);
+}
+
+void
+cli_init(void)
+{
+  cli_pool = rp_new(&root_pool, "CLI");
+}

nest/cli.h

+/*
+ *	BIRD Internet Routing Daemon -- Command-Line Interface
+ *
+ *	(c) 1999 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#ifndef _BIRD_CLI_H_
+#define _BIRD_CLI_H_
+
+#include "lib/resource.h"
+#include "lib/event.h"
+
+#define CLI_RX_BUF_SIZE 4096
+#define CLI_TX_BUF_SIZE 4096
+
+struct cli_out {
+  struct cli_out *next;
+  byte *wpos, *outpos, *end;
+  byte buf[0];
+};
+
+typedef struct cli {
+  pool *pool;
+  void *priv;				/* Private to sysdep layer */
+  int inited;
+  byte rx_buf[CLI_RX_BUF_SIZE];
+  byte *rx_pos, *rx_aux;		/* sysdep */
+  struct cli_out *tx_buf, *tx_pos, *tx_write;
+  event *event;
+} cli;
+
+extern pool *cli_pool;
+
+cli *cli_new(void *);
+void cli_init(void);
+void cli_free(cli *);
+void cli_kick(cli *);
+void cli_written(cli *);
+void cli_printf(cli *, int, char *, ...);
+
+/* Function provided by sysdep layer */
+
+int cli_write(cli *);
+void cli_disconnect(cli *);
+int cli_get_command(cli *);
+
+#endif

sysdep/unix/client-main.c

@@ -12,6 +12,7 @@
 #include <unistd.h>
 
 #include "nest/bird.h"
+#include "lib/resource.h"	/* For dmalloc */
 #include "client/client.h"
 
 #include "unix.h"

sysdep/unix/main.c

@@ -21,6 +21,7 @@
 #include "nest/route.h"
 #include "nest/protocol.h"
 #include "nest/iface.h"
+#include "nest/cli.h"
 #include "conf/conf.h"
 #include "filter/filter.h"
 
@@ -86,6 +87,119 @@ async_config(void)
   debug("Asynchronous reconfigurations are not supported in demo version\n");
 }
 
+/*
+ *	Command-Line Interface
+ */
+
+static sock *cli_sk;
+
+void
+cli_disconnect(cli *c)
+{
+  bug("CLI DISCONNECT: Not implemented"); /* FIXME */
+}
+
+int
+cli_write(cli *c)
+{
+  sock *s = c->priv;
+
+  if (c->tx_pos)
+    {
+      struct cli_out *o = c->tx_pos;
+      c->tx_pos = o->next;
+      s->tbuf = o->outpos;
+      return sk_send(s, o->wpos - o->outpos);
+    }
+  return 1;
+}
+
+int
+cli_get_command(cli *c)
+{
+  sock *s = c->priv;
+  byte *t = c->rx_aux ? : s->rbuf;
+  byte *tend = s->rpos;
+  byte *d = c->rx_pos;
+  byte *dend = c->rx_buf + CLI_RX_BUF_SIZE - 2;
+
+  while (t < tend)
+    {
+      if (*t == '\r')
+	t++;
+      else if (*t == '\n')
+	{
+	  t++;
+	  c->rx_pos = c->rx_buf;
+	  c->rx_aux = t;
+	  *d = 0;
+	  return (d < dend) ? 1 : -1;
+	}
+      else if (d < dend)
+	*d++ = *t++;
+    }
+  c->rx_aux = s->rpos = s->rbuf;
+  c->rx_pos = d;
+  return 0;
+}
+
+static int
+cli_rx(sock *s, int size)
+{
+  debug("CLI RX\n");
+  cli_kick(s->data);
+  return 0;
+}
+
+static void
+cli_tx(sock *s)
+{
+  cli *c = s->data;
+
+  debug("CLI TX\n");
+  if (cli_write(c))
+    cli_written(c);
+}
+
+static void
+cli_err(sock *s, int err)
+{
+  if (err)
+    log(L_INFO "CLI connection dropped: %s", strerror(err));
+  else
+    log(L_INFO "CLI connection closed");
+  s->type = SK_DELETED;
+  cli_free(s->data);
+}
+
+static int
+cli_connect(sock *s, int size)
+{
+  cli *c;
+
+  log(L_INFO "CLI connect");
+  s->rx_hook = cli_rx;
+  s->tx_hook = cli_tx;
+  s->err_hook = cli_err;
+  s->rbsize = 1024;
+  s->data = c = cli_new(s);
+  c->rx_pos = c->rx_buf;
+  c->rx_aux = NULL;
+  return 1;
+}
+
+static void
+cli_init_unix(void)
+{
+  sock *s;
+
+  cli_init();
+  s = cli_sk = sk_new(cli_pool);
+  s->type = SK_UNIX_PASSIVE;
+  s->rx_hook = cli_connect;
+  sk_open_unix(s, PATH_CONTROL_SOCKET);
+}
+
 /*
  *	Shutdown
  */
@@ -101,6 +215,7 @@ async_shutdown(void)
 void
 protos_shutdown_notify(void)
 {
+  unlink(PATH_CONTROL_SOCKET);
   die("System shutdown completed");
 }
 
@@ -194,7 +309,7 @@ main(int argc, char **argv)
 #endif
 
   log_init_debug(NULL);
-  setvbuf(stdout, NULL, _IONBF, 0);	/* And yes, this does make a difference */
+  setvbuf(stdout, NULL, _IONBF, 0);	/* FIXME: Kill some day. */
   setvbuf(stderr, NULL, _IONBF, 0);
   parse_args(argc, argv);
 
@@ -214,6 +329,8 @@ main(int argc, char **argv)
 
   signal_init();
 
+  cli_init_unix();
+
   protos_start();
 
   ev_run_list(&global_event_list);