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 <sys/types.h>
  25 #include <regex.h>
  26
  27 #include "thread.h"
  28 #include "log.h"
  29 #include "sockunion.h"
  30 #include "qobj.h"
  31 #include "compiler.h"
  32 #include "northbound.h"
  33
  34 #define VTY_BUFSIZ 4096
  35 #define VTY_MAXHIST 20
  36 #define VTY_MAXDEPTH 8
  37
  38 #define VTY_MAXCFGCHANGES 8
  39
  40 struct vty_error {
  41         char error_buf[VTY_BUFSIZ];
  42         uint32_t line_num;
  43 };
  44
  45 struct vty_cfg_change {
  46         const char *xpath;
  47         enum nb_operation operation;
  48         const char *value;
  49 };
  50
  51 /* VTY struct. */
  52 struct vty {
  53         /* File descripter of this vty. */
  54         int fd;
  55
  56         /* output FD, to support stdin/stdout combination */
  57         int wfd;
  58
  59         /* File output, used for VTYSH only */
  60         FILE *of;
  61         FILE *of_saved;
  62
  63         /* whether we are using pager or not */
  64         bool is_paged;
  65
  66         /* Is this vty connect to file or not */
  67         enum { VTY_TERM, VTY_FILE, VTY_SHELL, VTY_SHELL_SERV } type;
  68
  69         /* Node status of this vty */
  70         int node;
  71
  72         /* Failure count */
  73         int fail;
  74
  75         /* Output filer regex */
  76         bool filter;
  77         regex_t include;
  78
  79         /* Line buffer */
  80         struct buffer *lbuf;
  81
  82         /* Output buffer. */
  83         struct buffer *obuf;
  84
  85         /* Command input buffer */
  86         char *buf;
  87
  88         /* Command input error buffer */
  89         struct list *error;
  90
  91         /* Command cursor point */
  92         int cp;
  93
  94         /* Command length */
  95         int length;
  96
  97         /* Command max length. */
  98         int max;
  99
 100         /* Histry of command */
 101         char *hist[VTY_MAXHIST];
 102
 103         /* History lookup current point */
 104         int hp;
 105
 106         /* History insert end point */
 107         int hindex;
 108
 109         /* Changes enqueued to be applied in the candidate configuration. */
 110         size_t num_cfg_changes;
 111         struct vty_cfg_change cfg_changes[VTY_MAXCFGCHANGES];
 112
 113         /* XPath of the current node */
 114         int xpath_index;
 115         char xpath[VTY_MAXDEPTH][XPATH_MAXLEN];
 116
 117         /* Private candidate configuration mode. */
 118         bool private_config;
 119
 120         /* Candidate configuration. */
 121         struct nb_config *candidate_config;
 122
 123         /* Base candidate configuration. */
 124         struct nb_config *candidate_config_base;
 125
 126         /* qobj object ID (replacement for "index") */
 127         uint64_t qobj_index;
 128
 129         /* qobj second-level object ID (replacement for "index_sub") */
 130         uint64_t qobj_index_sub;
 131
 132         /* For escape character. */
 133         unsigned char escape;
 134
 135         /* Current vty status. */
 136         enum { VTY_NORMAL, VTY_CLOSE, VTY_MORE, VTY_MORELINE } status;
 137
 138         /* IAC handling: was the last character received the
 139            IAC (interpret-as-command) escape character (and therefore the next
 140            character will be the command code)?  Refer to Telnet RFC 854. */
 141         unsigned char iac;
 142
 143         /* IAC SB (option subnegotiation) handling */
 144         unsigned char iac_sb_in_progress;
 145 /* At the moment, we care only about the NAWS (window size) negotiation,
 146    and that requires just a 5-character buffer (RFC 1073):
 147      <NAWS char> <16-bit width> <16-bit height> */
 148 #define TELNET_NAWS_SB_LEN 5
 149         unsigned char sb_buf[TELNET_NAWS_SB_LEN];
 150         /* How many subnegotiation characters have we received?  We just drop
 151            those that do not fit in the buffer. */
 152         size_t sb_len;
 153
 154         /* Window width/height. */
 155         int width;
 156         int height;
 157
 158         /* Configure lines. */
 159         int lines;
 160
 161         /* Terminal monitor. */
 162         int monitor;
 163
 164         /* In configure mode. */
 165         int config;
 166
 167         /* Read and write thread. */
 168         struct thread *t_read;
 169         struct thread *t_write;
 170
 171         /* Timeout seconds and thread. */
 172         unsigned long v_timeout;
 173         struct thread *t_timeout;
 174
 175         /* What address is this vty comming from. */
 176         char address[SU_ADDRSTRLEN];
 177
 178         /* "frame" output.  This is buffered and will be printed if some
 179          * actual output follows, or will be discarded if the frame ends
 180          * without any output. */
 181         size_t frame_pos;
 182         char frame[1024];
 183 };
 184
 185 static inline void vty_push_context(struct vty *vty, int node, uint64_t id)
 186 {
 187         vty->node = node;
 188         vty->qobj_index = id;
 189 }
 190
 191 /* note: VTY_PUSH_CONTEXT(..., NULL) doesn't work, since it will try to
 192  * dereference "NULL->qobj_node.nid" */
 193 #define VTY_PUSH_CONTEXT(nodeval, ptr)                                         \
 194         vty_push_context(vty, nodeval, QOBJ_ID_0SAFE(ptr))
 195 #define VTY_PUSH_CONTEXT_NULL(nodeval) vty_push_context(vty, nodeval, 0ULL)
 196 #define VTY_PUSH_CONTEXT_SUB(nodeval, ptr)                                     \
 197         do {                                                                   \
 198                 vty->node = nodeval;                                           \
 199                 /* qobj_index stays untouched */                               \
 200                 vty->qobj_index_sub = QOBJ_ID_0SAFE(ptr);                      \
 201         } while (0)
 202
 203 /* can return NULL if context is invalid! */
 204 #define VTY_GET_CONTEXT(structname)                                            \
 205         QOBJ_GET_TYPESAFE(vty->qobj_index, structname)
 206 #define VTY_GET_CONTEXT_SUB(structname)                                        \
 207         QOBJ_GET_TYPESAFE(vty->qobj_index_sub, structname)
 208
 209 /* will return if ptr is NULL. */
 210 #define VTY_CHECK_CONTEXT(ptr)                                                 \
 211         if (!ptr) {                                                            \
 212                 vty_out(vty,                                                   \
 213                         "Current configuration object was deleted "            \
 214                         "by another process.\n");                              \
 215                 return CMD_WARNING;                                            \
 216         }
 217
 218 /* struct structname *ptr = <context>;   ptr will never be NULL. */
 219 #define VTY_DECLVAR_CONTEXT(structname, ptr)                                   \
 220         struct structname *ptr = VTY_GET_CONTEXT(structname);                  \
 221         VTY_CHECK_CONTEXT(ptr);
 222 #define VTY_DECLVAR_CONTEXT_SUB(structname, ptr)                               \
 223         struct structname *ptr = VTY_GET_CONTEXT_SUB(structname);              \
 224         VTY_CHECK_CONTEXT(ptr);
 225 #define VTY_DECLVAR_INSTANCE_CONTEXT(structname, ptr)                          \
 226         if (vty->qobj_index == 0)                                              \
 227                 return CMD_NOT_MY_INSTANCE;                                    \
 228         struct structname *ptr = VTY_GET_CONTEXT(structname);                  \
 229         VTY_CHECK_CONTEXT(ptr);
 230
 231 /* XPath macros. */
 232 #define VTY_PUSH_XPATH(nodeval, value)                                         \
 233         do {                                                                   \
 234                 if (vty->xpath_index >= VTY_MAXDEPTH) {                        \
 235                         vty_out(vty, "%% Reached maximum CLI depth (%u)\n",    \
 236                                 VTY_MAXDEPTH);                                 \
 237                         return CMD_WARNING;                                    \
 238                 }                                                              \
 239                 vty->node = nodeval;                                           \
 240                 strlcpy(vty->xpath[vty->xpath_index], value,                   \
 241                         sizeof(vty->xpath[0]));                                \
 242                 vty->xpath_index++;                                            \
 243         } while (0)
 244
 245 #define VTY_CURR_XPATH vty->xpath[vty->xpath_index - 1]
 246
 247 #define VTY_CHECK_XPATH                                                        \
 248         do {                                                                   \
 249                 if (vty->xpath_index > 0                                       \
 250                     && !yang_dnode_exists(vty->candidate_config->dnode,        \
 251                                           VTY_CURR_XPATH)) {                   \
 252                         vty_out(vty,                                           \
 253                                 "Current configuration object was deleted "    \
 254                                 "by another process.\n\n");                    \
 255                         return CMD_WARNING;                                    \
 256                 }                                                              \
 257         } while (0)
 258
 259 struct vty_arg {
 260         const char *name;
 261         const char *value;
 262         const char **argv;
 263         int argc;
 264 };
 265
 266 /* Integrated configuration file. */
 267 #define INTEGRATE_DEFAULT_CONFIG "frr.conf"
 268
 269 /* Default time out value */
 270 #define VTY_TIMEOUT_DEFAULT 600
 271
 272 /* Vty read buffer size. */
 273 #define VTY_READ_BUFSIZ 512
 274
 275 /* Directory separator. */
 276 #ifndef DIRECTORY_SEP
 277 #define DIRECTORY_SEP '/'
 278 #endif /* DIRECTORY_SEP */
 279
 280 #ifndef IS_DIRECTORY_SEP
 281 #define IS_DIRECTORY_SEP(c) ((c) == DIRECTORY_SEP)
 282 #endif
 283
 284 /* Exported variables */
 285 extern char integrate_default[];
 286 extern struct vty *vty_exclusive_lock;
 287
 288 /* Prototypes. */
 289 extern void vty_init(struct thread_master *);
 290 extern void vty_init_vtysh(void);
 291 extern void vty_terminate(void);
 292 extern void vty_reset(void);
 293 extern struct vty *vty_new(void);
 294 extern struct vty *vty_stdio(void (*atclose)(int isexit));
 295
 296 /* - vty_frame() output goes to a buffer (for context-begin markers)
 297  * - vty_out() will first print this buffer, and clear it
 298  * - vty_endframe() clears the buffer without printing it, and prints an
 299  *   extra string if the buffer was empty before (for context-end markers)
 300  */
 301 extern int vty_out(struct vty *, const char *, ...) PRINTF_ATTRIBUTE(2, 3);
 302 extern void vty_frame(struct vty *, const char *, ...) PRINTF_ATTRIBUTE(2, 3);
 303 extern void vty_endframe(struct vty *, const char *);
 304 bool vty_set_include(struct vty *vty, const char *regexp);
 305
 306 extern bool vty_read_config(struct nb_config *config, const char *config_file,
 307                             char *config_default_dir);
 308 extern void vty_time_print(struct vty *, int);
 309 extern void vty_serv_sock(const char *, unsigned short, const char *);
 310 extern void vty_close(struct vty *);
 311 extern char *vty_get_cwd(void);
 312 extern void vty_log(const char *level, const char *proto, const char *fmt,
 313                     struct timestamp_control *, va_list);
 314 extern int vty_config_lock(struct vty *);
 315 extern int vty_config_unlock(struct vty *);
 316 extern void vty_config_lockless(void);
 317 extern int vty_config_exclusive_lock(struct vty *vty);
 318 extern void vty_config_exclusive_unlock(struct vty *vty);
 319 extern int vty_shell(struct vty *);
 320 extern int vty_shell_serv(struct vty *);
 321 extern void vty_hello(struct vty *);
 322
 323 /* ^Z / SIGTSTP handling */
 324 extern void vty_stdio_suspend(void);
 325 extern void vty_stdio_resume(void);
 326 extern void vty_stdio_close(void);
 327
 328 /* Send a fixed-size message to all vty terminal monitors; this should be
 329    an async-signal-safe function. */
 330 extern void vty_log_fixed(char *buf, size_t len);
 331
 332 #endif /* _ZEBRA_VTY_H */