path: root/lib/vty.h

/* Virtual terminal [aka TeletYpe] interface routine
 * Copyright (C) 1997 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra 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 2, or (at your option) any
 * later version.
 *
 * GNU Zebra 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef _ZEBRA_VTY_H
#define _ZEBRA_VTY_H

#include "thread.h"
#include "log.h"
#include "sockunion.h"
#include "qobj.h"

#define VTY_BUFSIZ 4096
#define VTY_MAXHIST 20

/* VTY struct. */
struct vty 
{
  /* File descripter of this vty. */
  int fd;

  /* output FD, to support stdin/stdout combination */
  int wfd;

  /* Is this vty connect to file or not */
  enum {VTY_TERM, VTY_FILE, VTY_SHELL, VTY_SHELL_SERV} type;

  /* Node status of this vty */
  int node;

  /* Failure count */
  int fail;

  /* Output buffer. */
  struct buffer *obuf;

  /* Command input buffer */
  char *buf;

  /* Command input error buffer */
  char *error_buf;

  /* Command cursor point */
  int cp;

  /* Command length */
  int length;

  /* Command max length. */
  int max;

  /* Histry of command */
  char *hist[VTY_MAXHIST];

  /* History lookup current point */
  int hp;

  /* History insert end point */
  int hindex;

  /* qobj object ID (replacement for "index") */
  uint64_t qobj_index;

  /* qobj second-level object ID (replacement for "index_sub") */
  uint64_t qobj_index_sub;

  /* For escape character. */
  unsigned char escape;

  /* Current vty status. */
  enum {VTY_NORMAL, VTY_CLOSE, VTY_MORE, VTY_MORELINE} status;

  /* IAC handling: was the last character received the
     IAC (interpret-as-command) escape character (and therefore the next
     character will be the command code)?  Refer to Telnet RFC 854. */
  unsigned char iac;

  /* IAC SB (option subnegotiation) handling */
  unsigned char iac_sb_in_progress;
  /* At the moment, we care only about the NAWS (window size) negotiation,
     and that requires just a 5-character buffer (RFC 1073):
       <NAWS char> <16-bit width> <16-bit height> */
#define TELNET_NAWS_SB_LEN 5
  unsigned char sb_buf[TELNET_NAWS_SB_LEN];
  /* How many subnegotiation characters have we received?  We just drop
     those that do not fit in the buffer. */
  size_t sb_len;

  /* Window width/height. */
  int width;
  int height;

  /* Configure lines. */
  int lines;

  /* Terminal monitor. */
  int monitor;

  /* In configure mode. */
  int config;

  /* Read and write thread. */
  struct thread *t_read;
  struct thread *t_write;

  /* Timeout seconds and thread. */
  unsigned long v_timeout;
  struct thread *t_timeout;

  /* What address is this vty comming from. */
  char address[SU_ADDRSTRLEN];
};

static inline void vty_push_context(struct vty *vty,
                                    int node, uint64_t id)
{
  vty->node = node;
  vty->qobj_index = id;
}

/* note: VTY_PUSH_CONTEXT(..., NULL) doesn't work, since it will try to
 * dereference "NULL->qobj_node.nid" */
#define VTY_PUSH_CONTEXT(nodeval, ptr) \
	vty_push_context(vty, nodeval, QOBJ_ID_0SAFE(ptr))
#define VTY_PUSH_CONTEXT_NULL(nodeval) \
	vty_push_context(vty, nodeval, 0ULL)
#define VTY_PUSH_CONTEXT_SUB(nodeval, ptr) do { \
		vty->node = nodeval; \
		/* qobj_index stays untouched */ \
		vty->qobj_index_sub = QOBJ_ID_0SAFE(ptr); \
	} while (0)

/* can return NULL if context is invalid! */
#define VTY_GET_CONTEXT(structname) \
	QOBJ_GET_TYPESAFE(vty->qobj_index, structname)
#define VTY_GET_CONTEXT_SUB(structname) \
	QOBJ_GET_TYPESAFE(vty->qobj_index_sub, structname)

/* will return if ptr is NULL. */
#define VTY_CHECK_CONTEXT(ptr) \
	if (!ptr) { \
		vty_out (vty, "Current configuration object was deleted " \
				"by another process.%s", VTY_NEWLINE); \
		return CMD_WARNING; \
	}

/* struct structname *ptr = <context>;   ptr will never be NULL. */
#define VTY_DECLVAR_CONTEXT(structname, ptr) \
	struct structname *ptr = VTY_GET_CONTEXT(structname); \
	VTY_CHECK_CONTEXT(ptr);
#define VTY_DECLVAR_CONTEXT_SUB(structname, ptr) \
	struct structname *ptr = VTY_GET_CONTEXT_SUB(structname); \
	VTY_CHECK_CONTEXT(ptr);

struct vty_arg
{
  const char *name;
  const char *value;
  const char **argv;
  int argc;
};

/* Integrated configuration file. */
#define INTEGRATE_DEFAULT_CONFIG "frr.conf"

/* Small macro to determine newline is newline only or linefeed needed. */
#define VTY_NEWLINE  ((vty->type == VTY_TERM) ? "\r\n" : "\n")

/* Default time out value */
#define VTY_TIMEOUT_DEFAULT 600

/* Vty read buffer size. */
#define VTY_READ_BUFSIZ 512

/* Directory separator. */
#ifndef DIRECTORY_SEP
#define DIRECTORY_SEP '/'
#endif /* DIRECTORY_SEP */

#ifndef IS_DIRECTORY_SEP
#define IS_DIRECTORY_SEP(c) ((c) == DIRECTORY_SEP)
#endif

/* GCC have printf type attribute check.  */
#ifdef __GNUC__
#define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
#else
#define PRINTF_ATTRIBUTE(a,b)
#endif /* __GNUC__ */

/* Utility macros to convert VTY argument to unsigned long */
#define VTY_GET_ULONG(NAME,V,STR) \
do { \
  char *endptr = NULL; \
  errno = 0; \
  (V) = strtoul ((STR), &endptr, 10); \
  if (*(STR) == '-') \
    { \
      vty_out (vty, "%% Invalid %s value (dash)%s", NAME, VTY_NEWLINE); \
      return CMD_WARNING; \
    } \
  if (*endptr != '\0') \
    { \
      vty_out (vty, "%% Invalid %s value (%s)%s", NAME, endptr, VTY_NEWLINE); \
      return CMD_WARNING; \
    } \
  if (errno) \
    { \
      vty_out (vty, "%% Invalid %s value (error %d)%s", NAME, errno, VTY_NEWLINE); \
      return CMD_WARNING; \
    } \
} while (0)

/* Utility macros to convert VTY argument to unsigned long long */
#define VTY_GET_ULL(NAME,V,STR) \
do { \
  char *endptr = NULL; \
  errno = 0; \
  (V) = strtoull ((STR), &endptr, 10); \
  if (*(STR) == '-') \
    { \
      vty_out (vty, "%% Invalid %s value (dash)%s", NAME, VTY_NEWLINE); \
      return CMD_WARNING; \
    } \
  if (*endptr != '\0') \
    { \
      vty_out (vty, "%% Invalid %s value (%s)%s", NAME, endptr, VTY_NEWLINE); \
      return CMD_WARNING; \
    } \
  if (errno) \
    { \
      vty_out (vty, "%% Invalid %s value (error %d)%s", NAME, errno, VTY_NEWLINE); \
      return CMD_WARNING; \
    } \
} while (0)

/*
 * The logic below ((TMPL) <= ((MIN) && (TMPL) != (MIN)) is
 * done to circumvent the compiler complaining about
 * comparing unsigned numbers against zero, if MIN is zero.
 * NB: The compiler isn't smart enough to supress the warning
 * if you write (MIN) != 0 && tmpl < (MIN).
 */
#define VTY_GET_INTEGER_RANGE_HEART(NAME,TMPL,STR,MIN,MAX)      \
do {                                                            \
  VTY_GET_ULONG(NAME, (TMPL), STR);                             \
  if ( ((TMPL) <= (MIN) && (TMPL) != (MIN)) || (TMPL) > (MAX) ) \
    {                                                           \
      vty_out (vty, "%% Invalid %s value%s", NAME, VTY_NEWLINE);\
      return CMD_WARNING;                                       \
    }                                                           \
} while (0)

#define VTY_GET_INTEGER_RANGE(NAME,V,STR,MIN,MAX)               \
do {                                                            \
  unsigned long long tmpl;                                      \
  VTY_GET_INTEGER_RANGE_HEART(NAME,tmpl,STR,MIN,MAX);           \
  (V) = tmpl;                                                   \
} while (0)

#define VTY_CHECK_INTEGER_RANGE(NAME,STR,MIN,MAX)               \
do {                                                            \
  unsigned long tmpl;                                           \
  VTY_GET_INTEGER_RANGE_HEART(NAME,tmpl,STR,MIN,MAX);           \
} while (0)

#define VTY_GET_INTEGER(NAME,V,STR)                             \
    VTY_GET_INTEGER_RANGE(NAME,V,STR,0U,UINT32_MAX)

#define VTY_GET_IPV4_ADDRESS(NAME,V,STR)                                      \
do {                                                                             \
  int retv;                                                                   \
  retv = inet_aton ((STR), &(V));                                             \
  if (!retv)                                                                  \
    {                                                                         \
      vty_out (vty, "%% Invalid %s value%s", NAME, VTY_NEWLINE);              \
      return CMD_WARNING;                                                     \
    }                                                                         \
} while (0)

#define VTY_GET_IPV4_PREFIX(NAME,V,STR)                                       \
do {                                                                             \
  int retv;                                                                   \
  retv = str2prefix_ipv4 ((STR), &(V));                                       \
  if (retv <= 0)                                                              \
    {                                                                         \
      vty_out (vty, "%% Invalid %s value%s", NAME, VTY_NEWLINE);              \
      return CMD_WARNING;                                                     \
    }                                                                         \
} while (0)

#define VTY_WARN_EXPERIMENTAL()                                               \
do {                                                                          \
  vty_out (vty, "%% WARNING: this command is experimental. Both its name and" \
                " parameters may%s%% change in a future version of Quagga,"   \
                " possibly breaking your configuration!%s",                   \
                VTY_NEWLINE, VTY_NEWLINE);                                    \
} while (0)

/* Exported variables */
extern char integrate_default[];

/* Prototypes. */
extern void vty_init (struct thread_master *);
extern void vty_init_vtysh (void);
extern void vty_terminate (void);
extern void vty_reset (void);
extern struct vty *vty_new (void);
extern struct vty *vty_stdio (void (*atclose)(void));
extern int vty_out (struct vty *, const char *, ...) PRINTF_ATTRIBUTE(2, 3);
extern void vty_read_config (const char *, char *);
extern void vty_time_print (struct vty *, int);
extern void vty_serv_sock (const char *, unsigned short, const char *);
extern void vty_close (struct vty *);
extern char *vty_get_cwd (void);
extern void vty_log (const char *level, const char *proto, 
                     const char *fmt, struct timestamp_control *, va_list);
extern int vty_config_lock (struct vty *);
extern int vty_config_unlock (struct vty *);
extern void vty_config_lockless (void);
extern int vty_shell (struct vty *);
extern int vty_shell_serv (struct vty *);
extern void vty_hello (struct vty *);

/* Send a fixed-size message to all vty terminal monitors; this should be
   an async-signal-safe function. */
extern void vty_log_fixed (char *buf, size_t len);

extern const char *vty_get_arg_value (struct vty_arg **, const char *);
extern struct vty_arg *vty_get_arg (struct vty_arg **, const char *);

#endif /* _ZEBRA_VTY_H */