lib/vty.h

   1 /* Virtual terminal [aka TeletYpe] interface routine
   2  * Copyright (C) 1997 Kunihiro Ishiguro
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef _ZEBRA_VTY_H
  22 #define _ZEBRA_VTY_H
  23
  24 #include "thread.h"
  25 #include "log.h"
  26 #include "sockunion.h"
  27 #include "qobj.h"
  28 #include "compiler.h"
  29
  30 #define VTY_BUFSIZ 4096
  31 #define VTY_MAXHIST 20
  32
  33 /* VTY struct. */
  34 struct vty {
  35         /* File descripter of this vty. */
  36         int fd;
  37
  38         /* output FD, to support stdin/stdout combination */
  39         int wfd;
  40
  41         /* Is this vty connect to file or not */
  42         enum { VTY_TERM, VTY_FILE, VTY_SHELL, VTY_SHELL_SERV } type;
  43
  44         /* Node status of this vty */
  45         int node;
  46
  47         /* Failure count */
  48         int fail;
  49
  50         /* Output buffer. */
  51         struct buffer *obuf;
  52
  53         /* Command input buffer */
  54         char *buf;
  55
  56         /* Command input error buffer */
  57         char *error_buf;
  58
  59         /* Command cursor point */
  60         int cp;
  61
  62         /* Command length */
  63         int length;
  64
  65         /* Command max length. */
  66         int max;
  67
  68         /* Histry of command */
  69         char *hist[VTY_MAXHIST];
  70
  71         /* History lookup current point */
  72         int hp;
  73
  74         /* History insert end point */
  75         int hindex;
  76
  77         /* qobj object ID (replacement for "index") */
  78         uint64_t qobj_index;
  79
  80         /* qobj second-level object ID (replacement for "index_sub") */
  81         uint64_t qobj_index_sub;
  82
  83         /* For escape character. */
  84         unsigned char escape;
  85
  86         /* Current vty status. */
  87         enum { VTY_NORMAL, VTY_CLOSE, VTY_MORE, VTY_MORELINE } status;
  88
  89         /* IAC handling: was the last character received the
  90            IAC (interpret-as-command) escape character (and therefore the next
  91            character will be the command code)?  Refer to Telnet RFC 854. */
  92         unsigned char iac;
  93
  94         /* IAC SB (option subnegotiation) handling */
  95         unsigned char iac_sb_in_progress;
  96 /* At the moment, we care only about the NAWS (window size) negotiation,
  97    and that requires just a 5-character buffer (RFC 1073):
  98      <NAWS char> <16-bit width> <16-bit height> */
  99 #define TELNET_NAWS_SB_LEN 5
 100         unsigned char sb_buf[TELNET_NAWS_SB_LEN];
 101         /* How many subnegotiation characters have we received?  We just drop
 102            those that do not fit in the buffer. */
 103         size_t sb_len;
 104
 105         /* Window width/height. */
 106         int width;
 107         int height;
 108
 109         /* Configure lines. */
 110         int lines;
 111
 112         /* Terminal monitor. */
 113         int monitor;
 114
 115         /* In configure mode. */
 116         int config;
 117
 118         /* Read and write thread. */
 119         struct thread *t_read;
 120         struct thread *t_write;
 121
 122         /* Timeout seconds and thread. */
 123         unsigned long v_timeout;
 124         struct thread *t_timeout;
 125
 126         /* What address is this vty comming from. */
 127         char address[SU_ADDRSTRLEN];
 128
 129         /* "frame" output.  This is buffered and will be printed if some
 130          * actual output follows, or will be discarded if the frame ends
 131          * without any output. */
 132         size_t frame_pos;
 133         char frame[1024];
 134 };
 135
 136 static inline void vty_push_context(struct vty *vty, int node, uint64_t id)
 137 {
 138         vty->node = node;
 139         vty->qobj_index = id;
 140 }
 141
 142 /* note: VTY_PUSH_CONTEXT(..., NULL) doesn't work, since it will try to
 143  * dereference "NULL->qobj_node.nid" */
 144 #define VTY_PUSH_CONTEXT(nodeval, ptr)                                         \
 145         vty_push_context(vty, nodeval, QOBJ_ID_0SAFE(ptr))
 146 #define VTY_PUSH_CONTEXT_NULL(nodeval) vty_push_context(vty, nodeval, 0ULL)
 147 #define VTY_PUSH_CONTEXT_SUB(nodeval, ptr)                                     \
 148         do {                                                                   \
 149                 vty->node = nodeval;                                           \
 150                 /* qobj_index stays untouched */                               \
 151                 vty->qobj_index_sub = QOBJ_ID_0SAFE(ptr);                      \
 152         } while (0)
 153
 154 /* can return NULL if context is invalid! */
 155 #define VTY_GET_CONTEXT(structname)                                            \
 156         QOBJ_GET_TYPESAFE(vty->qobj_index, structname)
 157 #define VTY_GET_CONTEXT_SUB(structname)                                        \
 158         QOBJ_GET_TYPESAFE(vty->qobj_index_sub, structname)
 159
 160 /* will return if ptr is NULL. */
 161 #define VTY_CHECK_CONTEXT(ptr)                                                 \
 162         if (!ptr) {                                                            \
 163                 vty_out(vty,                                                   \
 164                         "Current configuration object was deleted "            \
 165                         "by another process.\n");                              \
 166                 return CMD_WARNING;                                            \
 167         }
 168
 169 /* struct structname *ptr = <context>;   ptr will never be NULL. */
 170 #define VTY_DECLVAR_CONTEXT(structname, ptr)                                   \
 171         struct structname *ptr = VTY_GET_CONTEXT(structname);                  \
 172         VTY_CHECK_CONTEXT(ptr);
 173 #define VTY_DECLVAR_CONTEXT_SUB(structname, ptr)                               \
 174         struct structname *ptr = VTY_GET_CONTEXT_SUB(structname);              \
 175         VTY_CHECK_CONTEXT(ptr);
 176 #define VTY_DECLVAR_INSTANCE_CONTEXT(structname, ptr)                          \
 177         if (vty->qobj_index == 0)                                              \
 178                 return CMD_NOT_MY_INSTANCE;                                    \
 179         struct structname *ptr = VTY_GET_CONTEXT(structname);                  \
 180         VTY_CHECK_CONTEXT(ptr);
 181
 182 struct vty_arg {
 183         const char *name;
 184         const char *value;
 185         const char **argv;
 186         int argc;
 187 };
 188
 189 /* Integrated configuration file. */
 190 #define INTEGRATE_DEFAULT_CONFIG "frr.conf"
 191
 192 /* Default time out value */
 193 #define VTY_TIMEOUT_DEFAULT 600
 194
 195 /* Vty read buffer size. */
 196 #define VTY_READ_BUFSIZ 512
 197
 198 /* Directory separator. */
 199 #ifndef DIRECTORY_SEP
 200 #define DIRECTORY_SEP '/'
 201 #endif /* DIRECTORY_SEP */
 202
 203 #ifndef IS_DIRECTORY_SEP
 204 #define IS_DIRECTORY_SEP(c) ((c) == DIRECTORY_SEP)
 205 #endif
 206
 207 /* Exported variables */
 208 extern char integrate_default[];
 209
 210 /* Prototypes. */
 211 extern void vty_init(struct thread_master *);
 212 extern void vty_init_vtysh(void);
 213 extern void vty_terminate(void);
 214 extern void vty_reset(void);
 215 extern struct vty *vty_new(void);
 216 extern struct vty *vty_stdio(void (*atclose)(int isexit));
 217
 218 /* - vty_frame() output goes to a buffer (for context-begin markers)
 219  * - vty_out() will first print this buffer, and clear it
 220  * - vty_endframe() clears the buffer without printing it, and prints an
 221  *   extra string if the buffer was empty before (for context-end markers)
 222  */
 223 extern int vty_out(struct vty *, const char *, ...) PRINTF_ATTRIBUTE(2, 3);
 224 extern void vty_frame(struct vty *, const char *, ...) PRINTF_ATTRIBUTE(2, 3);
 225 extern void vty_endframe(struct vty *, const char *);
 226
 227 extern void vty_read_config(const char *, char *);
 228 extern void vty_time_print(struct vty *, int);
 229 extern void vty_serv_sock(const char *, unsigned short, const char *);
 230 extern void vty_close(struct vty *);
 231 extern char *vty_get_cwd(void);
 232 extern void vty_log(const char *level, const char *proto, const char *fmt,
 233                     struct timestamp_control *, va_list);
 234 extern int vty_config_lock(struct vty *);
 235 extern int vty_config_unlock(struct vty *);
 236 extern void vty_config_lockless(void);
 237 extern int vty_shell(struct vty *);
 238 extern int vty_shell_serv(struct vty *);
 239 extern void vty_hello(struct vty *);
 240
 241 /* ^Z / SIGTSTP handling */
 242 extern void vty_stdio_suspend(void);
 243 extern void vty_stdio_resume(void);
 244 extern void vty_stdio_close(void);
 245
 246 /* Send a fixed-size message to all vty terminal monitors; this should be
 247    an async-signal-safe function. */
 248 extern void vty_log_fixed(char *buf, size_t len);
 249
 250 #endif /* _ZEBRA_VTY_H */