Gitiles
Code Review Sign In
gerrit.nordix.org / fdio / vpp / 4227eefcd4ef4aa195bec4527d18f027fcc3815c / . / src / vlib / unix / cli.c
blob: cf524213f5bbdca520bed39d2c80e505eaf3515a [file] [log] [blame]
/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* cli.c: Unix stdin/socket CLI.
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* @file
* @brief Unix stdin/socket command line interface.
* Provides a command line interface so humans can interact with VPP.
* This is predominantly a debugging and testing mechanism.
*/
/*? %%clicmd:group_label Command line session %% ?*/
/*? %%syscfg:group_label Command line session %% ?*/
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vppinfra/timer.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <termios.h>
#include <signal.h>
#include <unistd.h>
#include <arpa/telnet.h>
#include <sys/ioctl.h>
/** ANSI escape code. */
#define ESC "\x1b"
/** ANSI Control Sequence Introducer. */
#define CSI ESC "["
/** ANSI clear screen. */
#define ANSI_CLEAR CSI "2J" CSI "1;1H"
/** ANSI reset color settings. */
#define ANSI_RESET CSI "0m"
/** ANSI Start bold text. */
#define ANSI_BOLD CSI "1m"
/** ANSI Stop bold text. */
#define ANSI_DIM CSI "2m"
/** ANSI Start dark red text. */
#define ANSI_DRED ANSI_DIM CSI "31m"
/** ANSI Start bright red text. */
#define ANSI_BRED ANSI_BOLD CSI "31m"
/** ANSI clear line cursor is on. */
#define ANSI_CLEARLINE CSI "2K"
/** ANSI scroll screen down one line. */
#define ANSI_SCROLLDN CSI "1T"
/** ANSI save cursor position. */
#define ANSI_SAVECURSOR CSI "s"
/** ANSI restore cursor position if previously saved. */
#define ANSI_RESTCURSOR CSI "u"
/** Maximum depth into a byte stream from which to compile a Telnet
* protocol message. This is a saftey measure. */
#define UNIX_CLI_MAX_DEPTH_TELNET 24
/** Unix standard in */
#define UNIX_CLI_STDIN_FD 0
/** A CLI banner line. */
typedef struct
{
u8 *line; /**< The line to print. */
u32 length; /**< The length of the line without terminating NUL. */
} unix_cli_banner_t;
#define _(a) { .line = (u8 *)(a), .length = sizeof(a) - 1 }
/** Plain welcome banner. */
static unix_cli_banner_t unix_cli_banner[] = {
_(" _______ _ _ _____ ___ \n"),
_(" __/ __/ _ \\ (_)__ | | / / _ \\/ _ \\\n"),
_(" _/ _// // / / / _ \\ | |/ / ___/ ___/\n"),
_(" /_/ /____(_)_/\\___/ |___/_/ /_/ \n"),
_("\n")
};
/** ANSI color welcome banner. */
static unix_cli_banner_t unix_cli_banner_color[] = {
_(ANSI_BRED " _______ _ " ANSI_RESET " _ _____ ___ \n"),
_(ANSI_BRED " __/ __/ _ \\ (_)__ " ANSI_RESET " | | / / _ \\/ _ \\\n"),
_(ANSI_BRED " _/ _// // / / / _ \\" ANSI_RESET " | |/ / ___/ ___/\n"),
_(ANSI_BRED " /_/ /____(_)_/\\___/" ANSI_RESET " |___/_/ /_/ \n"),
_("\n")
};
#undef _
/** Pager line index */
typedef struct
{
/** Index into pager_vector */
u32 line;
/** Offset of the string in the line */
u32 offset;
/** Length of the string in the line */
u32 length;
} unix_cli_pager_index_t;
/** Unix CLI session. */
typedef struct
{
/** The file index held by unix.c */
u32 unix_file_index;
/** Vector of output pending write to file descriptor. */
u8 *output_vector;
/** Vector of input saved by Unix input node to be processed by
CLI process. */
u8 *input_vector;
/** This session has command history. */
u8 has_history;
/** Array of vectors of commands in the history. */
u8 **command_history;
/** The command currently pointed at by the history cursor. */
u8 *current_command;
/** How far from the end of the history array the user has browsed. */
i32 excursion;
/** Maximum number of history entries this session will store. */
u32 history_limit;
/** Current command line counter */
u32 command_number;
/** The string being searched for in the history. */
u8 *search_key;
/** If non-zero then the CLI is searching in the history array.
* - @c -1 means search backwards.
* - @c 1 means search forwards.
*/
int search_mode;
/** Position of the insert cursor on the current input line */
u32 cursor;
/** Line mode or char mode */
u8 line_mode;
/** Set if the CRLF mode wants CR + LF */
u8 crlf_mode;
/** Can we do ANSI output? */
u8 ansi_capable;
/** Has the session started? */
u8 started;
/** Disable the pager? */
u8 no_pager;
/** Pager buffer */
u8 **pager_vector;
/** Index of line fragments in the pager buffer */
unix_cli_pager_index_t *pager_index;
/** Line number of top of page */
u32 pager_start;
/** Terminal width */
u32 width;
/** Terminal height */
u32 height;
/** Process node identifier */
u32 process_node_index;
} unix_cli_file_t;
/** Resets the pager buffer and other data.
* @param f The CLI session whose pager needs to be reset.
*/
always_inline void
unix_cli_pager_reset (unix_cli_file_t * f)
{
u8 **p;
f->pager_start = 0;
vec_free (f->pager_index);
f->pager_index = 0;
vec_foreach (p, f->pager_vector)
{
vec_free (*p);
}
vec_free (f->pager_vector);
f->pager_vector = 0;
}
/** Release storage used by a CLI session.
* @param f The CLI session whose storage needs to be released.
*/
always_inline void
unix_cli_file_free (unix_cli_file_t * f)
{
vec_free (f->output_vector);
vec_free (f->input_vector);
unix_cli_pager_reset (f);
}
/** CLI actions */
typedef enum
{
UNIX_CLI_PARSE_ACTION_NOACTION = 0, /**< No action */
UNIX_CLI_PARSE_ACTION_CRLF, /**< Carriage return, newline or enter */
UNIX_CLI_PARSE_ACTION_TAB, /**< Tab key */
UNIX_CLI_PARSE_ACTION_ERASE, /**< Erase cursor left */
UNIX_CLI_PARSE_ACTION_ERASERIGHT, /**< Erase cursor right */
UNIX_CLI_PARSE_ACTION_UP, /**< Up arrow */
UNIX_CLI_PARSE_ACTION_DOWN, /**< Down arrow */
UNIX_CLI_PARSE_ACTION_LEFT, /**< Left arrow */
UNIX_CLI_PARSE_ACTION_RIGHT, /**< Right arrow */
UNIX_CLI_PARSE_ACTION_HOME, /**< Home key (jump to start of line) */
UNIX_CLI_PARSE_ACTION_END, /**< End key (jump to end of line) */
UNIX_CLI_PARSE_ACTION_WORDLEFT, /**< Jump cursor to start of left word */
UNIX_CLI_PARSE_ACTION_WORDRIGHT, /**< Jump cursor to start of right word */
UNIX_CLI_PARSE_ACTION_ERASELINELEFT, /**< Erase line to left of cursor */
UNIX_CLI_PARSE_ACTION_ERASELINERIGHT, /**< Erase line to right & including cursor */
UNIX_CLI_PARSE_ACTION_CLEAR, /**< Clear the terminal */
UNIX_CLI_PARSE_ACTION_REVSEARCH, /**< Search backwards in command history */
UNIX_CLI_PARSE_ACTION_FWDSEARCH, /**< Search forwards in command history */
UNIX_CLI_PARSE_ACTION_YANK, /**< Undo last erase action */
UNIX_CLI_PARSE_ACTION_TELNETIAC, /**< Telnet control code */
UNIX_CLI_PARSE_ACTION_PAGER_CRLF, /**< Enter pressed (CR, CRLF, LF, etc) */
UNIX_CLI_PARSE_ACTION_PAGER_QUIT, /**< Exit the pager session */
UNIX_CLI_PARSE_ACTION_PAGER_NEXT, /**< Scroll to next page */
UNIX_CLI_PARSE_ACTION_PAGER_DN, /**< Scroll to next line */
UNIX_CLI_PARSE_ACTION_PAGER_UP, /**< Scroll to previous line */
UNIX_CLI_PARSE_ACTION_PAGER_TOP, /**< Scroll to first line */
UNIX_CLI_PARSE_ACTION_PAGER_BOTTOM, /**< Scroll to last line */
UNIX_CLI_PARSE_ACTION_PAGER_PGDN, /**< Scroll to next page */
UNIX_CLI_PARSE_ACTION_PAGER_PGUP, /**< Scroll to previous page */
UNIX_CLI_PARSE_ACTION_PAGER_REDRAW, /**< Clear and redraw the page on the terminal */
UNIX_CLI_PARSE_ACTION_PAGER_SEARCH, /**< Search the pager buffer */
UNIX_CLI_PARSE_ACTION_PARTIALMATCH, /**< Action parser found a partial match */
UNIX_CLI_PARSE_ACTION_NOMATCH /**< Action parser did not find any match */
} unix_cli_parse_action_t;
/** @brief Mapping of input buffer strings to action values.
* @note This won't work as a hash since we need to be able to do
* partial matches on the string.
*/
typedef struct
{
u8 *input; /**< Input string to match. */
u32 len; /**< Length of input without final NUL. */
unix_cli_parse_action_t action; /**< Action to take when matched. */
} unix_cli_parse_actions_t;
/** @brief Given a capital ASCII letter character return a @c NUL terminated
* string with the control code for that letter.
*
* @param c An ASCII character.
* @return A @c NUL terminated string of type @c u8[].
*
* @par Example
* @c CTL('A') returns <code>{ 0x01, 0x00 }</code> as a @c u8[].
*/
#define CTL(c) (u8[]){ (c) - '@', 0 }
#define _(a,b) { .input = (u8 *)(a), .len = sizeof(a) - 1, .action = (b) }
/**
* Patterns to match on a CLI input stream.
* @showinitializer
*/
static unix_cli_parse_actions_t unix_cli_parse_strings[] = {
/* Line handling */
_("\r\n", UNIX_CLI_PARSE_ACTION_CRLF), /* Must be before '\r' */
_("\n", UNIX_CLI_PARSE_ACTION_CRLF),
_("\r\0", UNIX_CLI_PARSE_ACTION_CRLF), /* Telnet does this */
_("\r", UNIX_CLI_PARSE_ACTION_CRLF),
/* Unix shell control codes */
_(CTL ('B'), UNIX_CLI_PARSE_ACTION_LEFT),
_(CTL ('F'), UNIX_CLI_PARSE_ACTION_RIGHT),
_(CTL ('P'), UNIX_CLI_PARSE_ACTION_UP),
_(CTL ('N'), UNIX_CLI_PARSE_ACTION_DOWN),
_(CTL ('A'), UNIX_CLI_PARSE_ACTION_HOME),
_(CTL ('E'), UNIX_CLI_PARSE_ACTION_END),
_(CTL ('D'), UNIX_CLI_PARSE_ACTION_ERASERIGHT),
_(CTL ('U'), UNIX_CLI_PARSE_ACTION_ERASELINELEFT),
_(CTL ('K'), UNIX_CLI_PARSE_ACTION_ERASELINERIGHT),
_(CTL ('Y'), UNIX_CLI_PARSE_ACTION_YANK),
_(CTL ('L'), UNIX_CLI_PARSE_ACTION_CLEAR),
_(ESC "b", UNIX_CLI_PARSE_ACTION_WORDLEFT), /* Alt-B */
_(ESC "f", UNIX_CLI_PARSE_ACTION_WORDRIGHT), /* Alt-F */
_("\b", UNIX_CLI_PARSE_ACTION_ERASE), /* ^H */
_("\x7f", UNIX_CLI_PARSE_ACTION_ERASE), /* Backspace */
_("\t", UNIX_CLI_PARSE_ACTION_TAB), /* ^I */
/* VT100 Normal mode - Broadest support */
_(CSI "A", UNIX_CLI_PARSE_ACTION_UP),
_(CSI "B", UNIX_CLI_PARSE_ACTION_DOWN),
_(CSI "C", UNIX_CLI_PARSE_ACTION_RIGHT),
_(CSI "D", UNIX_CLI_PARSE_ACTION_LEFT),
_(CSI "H", UNIX_CLI_PARSE_ACTION_HOME),
_(CSI "F", UNIX_CLI_PARSE_ACTION_END),
_(CSI "3~", UNIX_CLI_PARSE_ACTION_ERASERIGHT), /* Delete */
_(CSI "1;5D", UNIX_CLI_PARSE_ACTION_WORDLEFT), /* C-Left */
_(CSI "1;5C", UNIX_CLI_PARSE_ACTION_WORDRIGHT), /* C-Right */
/* VT100 Application mode - Some Gnome Terminal functions use these */
_(ESC "OA", UNIX_CLI_PARSE_ACTION_UP),
_(ESC "OB", UNIX_CLI_PARSE_ACTION_DOWN),
_(ESC "OC", UNIX_CLI_PARSE_ACTION_RIGHT),
_(ESC "OD", UNIX_CLI_PARSE_ACTION_LEFT),
_(ESC "OH", UNIX_CLI_PARSE_ACTION_HOME),
_(ESC "OF", UNIX_CLI_PARSE_ACTION_END),
/* ANSI X3.41-1974 - sent by Microsoft Telnet and PuTTY */
_(CSI "1~", UNIX_CLI_PARSE_ACTION_HOME),
_(CSI "4~", UNIX_CLI_PARSE_ACTION_END),
/* Emacs-ish history search */
_(CTL ('S'), UNIX_CLI_PARSE_ACTION_FWDSEARCH),
_(CTL ('R'), UNIX_CLI_PARSE_ACTION_REVSEARCH),
/* Other protocol things */
_("\xff", UNIX_CLI_PARSE_ACTION_TELNETIAC), /* IAC */
_("\0", UNIX_CLI_PARSE_ACTION_NOACTION), /* NUL */
_(NULL, UNIX_CLI_PARSE_ACTION_NOMATCH)
};
/**
* Patterns to match when a CLI session is in the pager.
* @showinitializer
*/
static unix_cli_parse_actions_t unix_cli_parse_pager[] = {
/* Line handling */
_("\r\n", UNIX_CLI_PARSE_ACTION_PAGER_CRLF), /* Must be before '\r' */
_("\n", UNIX_CLI_PARSE_ACTION_PAGER_CRLF),
_("\r\0", UNIX_CLI_PARSE_ACTION_PAGER_CRLF), /* Telnet does this */
_("\r", UNIX_CLI_PARSE_ACTION_PAGER_CRLF),
/* Pager commands */
_(" ", UNIX_CLI_PARSE_ACTION_PAGER_NEXT),
_("q", UNIX_CLI_PARSE_ACTION_PAGER_QUIT),
_(CTL ('L'), UNIX_CLI_PARSE_ACTION_PAGER_REDRAW),
_(CTL ('R'), UNIX_CLI_PARSE_ACTION_PAGER_REDRAW),
_("/", UNIX_CLI_PARSE_ACTION_PAGER_SEARCH),
/* VT100 */
_(CSI "A", UNIX_CLI_PARSE_ACTION_PAGER_UP),
_(CSI "B", UNIX_CLI_PARSE_ACTION_PAGER_DN),
_(CSI "H", UNIX_CLI_PARSE_ACTION_PAGER_TOP),
_(CSI "F", UNIX_CLI_PARSE_ACTION_PAGER_BOTTOM),
/* VT100 Application mode */
_(ESC "OA", UNIX_CLI_PARSE_ACTION_PAGER_UP),
_(ESC "OB", UNIX_CLI_PARSE_ACTION_PAGER_DN),
_(ESC "OH", UNIX_CLI_PARSE_ACTION_PAGER_TOP),
_(ESC "OF", UNIX_CLI_PARSE_ACTION_PAGER_BOTTOM),
/* ANSI X3.41-1974 */
_(CSI "1~", UNIX_CLI_PARSE_ACTION_PAGER_TOP),
_(CSI "4~", UNIX_CLI_PARSE_ACTION_PAGER_BOTTOM),
_(CSI "5~", UNIX_CLI_PARSE_ACTION_PAGER_PGUP),
_(CSI "6~", UNIX_CLI_PARSE_ACTION_PAGER_PGDN),
/* Other protocol things */
_("\xff", UNIX_CLI_PARSE_ACTION_TELNETIAC), /* IAC */
_("\0", UNIX_CLI_PARSE_ACTION_NOACTION), /* NUL */
_(NULL, UNIX_CLI_PARSE_ACTION_NOMATCH)
};
#undef _
/** CLI session events. */
typedef enum
{
UNIX_CLI_PROCESS_EVENT_READ_READY, /**< A file descriptor has data to be read. */
UNIX_CLI_PROCESS_EVENT_QUIT, /**< A CLI session wants to close. */
} unix_cli_process_event_type_t;
/** CLI global state. */
typedef struct
{
/** Prompt string for CLI. */
u8 *cli_prompt;
/** Vec pool of CLI sessions. */
unix_cli_file_t *cli_file_pool;
/** Vec pool of unused session indices. */
u32 *unused_cli_process_node_indices;
/** The session index of the stdin cli */
u32 stdin_cli_file_index;
/** File pool index of current input. */
u32 current_input_file_index;
} unix_cli_main_t;
/** CLI global state */
static unix_cli_main_t unix_cli_main;
/**
* @brief Search for a byte sequence in the action list.
*
* Searches the @ref unix_cli_parse_actions_t list in @a a for a match with
* the bytes in @a input of maximum length @a ilen bytes.
* When a match is made @a *matched indicates how many bytes were matched.
* Returns a value from the enum @ref unix_cli_parse_action_t to indicate
* whether no match was found, a partial match was found or a complete
* match was found and what action, if any, should be taken.
*
* @param[in] a Actions list to search within.
* @param[in] input String fragment to search for.
* @param[in] ilen Length of the string in 'input'.
* @param[out] matched Pointer to an integer that will contain the number
* of bytes matched when a complete match is found.
*
* @return Action from @ref unix_cli_parse_action_t that the string fragment
* matches.
* @ref UNIX_CLI_PARSE_ACTION_PARTIALMATCH is returned when the
* whole input string matches the start of at least one action.
* @ref UNIX_CLI_PARSE_ACTION_NOMATCH is returned when there is no
* match at all.
*/
static unix_cli_parse_action_t
unix_cli_match_action (unix_cli_parse_actions_t * a,
u8 * input, u32 ilen, i32 * matched)
{
u8 partial = 0;
while (a->input)
{
if (ilen >= a->len)
{
/* see if the start of the input buffer exactly matches the current
* action string. */
if (memcmp (input, a->input, a->len) == 0)
{
*matched = a->len;
return a->action;
}
}
else
{
/* if the first ilen characters match, flag this as a partial -
* meaning keep collecting bytes in case of a future match */
if (memcmp (input, a->input, ilen) == 0)
partial = 1;
}
/* check next action */
a++;
}
return partial ?
UNIX_CLI_PARSE_ACTION_PARTIALMATCH : UNIX_CLI_PARSE_ACTION_NOMATCH;
}
/** Add bytes to the output vector and then flagg the I/O system that bytes
* are available to be sent.
*/
static void
unix_cli_add_pending_output (unix_file_t * uf,
unix_cli_file_t * cf,
u8 * buffer, uword buffer_bytes)
{
unix_main_t *um = &unix_main;
vec_add (cf->output_vector, buffer, buffer_bytes);
if (vec_len (cf->output_vector) > 0)
{
int skip_update = 0 != (uf->flags & UNIX_FILE_DATA_AVAILABLE_TO_WRITE);
uf->flags |= UNIX_FILE_DATA_AVAILABLE_TO_WRITE;
if (!skip_update)
um->file_update (uf, UNIX_FILE_UPDATE_MODIFY);
}
}
/** Delete all bytes from the output vector and flag the I/O system
* that no more bytes are available to be sent.
*/
static void
unix_cli_del_pending_output (unix_file_t * uf,
unix_cli_file_t * cf, uword n_bytes)
{
unix_main_t *um = &unix_main;
vec_delete (cf->output_vector, n_bytes, 0);
if (vec_len (cf->output_vector) <= 0)
{
int skip_update = 0 == (uf->flags & UNIX_FILE_DATA_AVAILABLE_TO_WRITE);
uf->flags &= ~UNIX_FILE_DATA_AVAILABLE_TO_WRITE;
if (!skip_update)
um->file_update (uf, UNIX_FILE_UPDATE_MODIFY);
}
}
/** @brief A bit like strchr with a buffer length limit.
* Search a buffer for the first instance of a character up to the limit of
* the buffer length. If found then return the position of that character.
*
* The key departure from strchr is that if the character is not found then
* return the buffer length.
*
* @param chr The byte value to search for.
* @param str The buffer in which to search for the value.
* @param len The depth into the buffer to search.
*
* @return The index of the first occurence of \c chr. If \c chr is not
* found then \c len instead.
*/
always_inline word
unix_vlib_findchr (u8 chr, u8 * str, word len)
{
word i = 0;
for (i = 0; i < len; i++, str++)
{
if (*str == chr)
return i;
}
return len;
}
/** @brief Send a buffer to the CLI stream if possible, enqueue it otherwise.
* Attempts to write given buffer to the file descriptor of the given
* Unix CLI session. If that session already has data in the output buffer
* or if the write attempt tells us to try again later then the given buffer
* is appended to the pending output buffer instead.
*
* This is typically called only from \c unix_vlib_cli_output_cooked since
* that is where CRLF handling occurs or from places where we explicitly do
* not want cooked handling.
*
* @param cf Unix CLI session of the desired stream to write to.
* @param uf The Unix file structure of the desired stream to write to.
* @param buffer Pointer to the buffer that needs to be written.
* @param buffer_bytes The number of bytes from \c buffer to write.
*/
static void
unix_vlib_cli_output_raw (unix_cli_file_t * cf,
unix_file_t * uf, u8 * buffer, uword buffer_bytes)
{
int n = 0;
if (vec_len (cf->output_vector) == 0)
n = write (uf->file_descriptor, buffer, buffer_bytes);
if (n < 0 && errno != EAGAIN)
{
clib_unix_warning ("write");
}
else if ((word) n < (word) buffer_bytes)
{
/* We got EAGAIN or we already have stuff in the buffer;
* queue up whatever didn't get sent for later. */
if (n < 0)
n = 0;
unix_cli_add_pending_output (uf, cf, buffer + n, buffer_bytes - n);
}
}
/** @brief Process a buffer for CRLF handling before outputting it to the CLI.
*
* @param cf Unix CLI session of the desired stream to write to.
* @param uf The Unix file structure of the desired stream to write to.
* @param buffer Pointer to the buffer that needs to be written.
* @param buffer_bytes The number of bytes from \c buffer to write.
*/
static void
unix_vlib_cli_output_cooked (unix_cli_file_t * cf,
unix_file_t * uf,
u8 * buffer, uword buffer_bytes)
{
word end = 0, start = 0;
while (end < buffer_bytes)
{
if (cf->crlf_mode)
{
/* iterate the line on \n's so we can insert a \r before it */
end = unix_vlib_findchr ('\n',
buffer + start,
buffer_bytes - start) + start;
}
else
{
/* otherwise just send the whole buffer */
end = buffer_bytes;
}
unix_vlib_cli_output_raw (cf, uf, buffer + start, end - start);
if (cf->crlf_mode)
{
if (end < buffer_bytes)
{
unix_vlib_cli_output_raw (cf, uf, (u8 *) "\r\n", 2);
end++; /* skip the \n that we already sent */
}
start = end;
}
}
}
/** @brief Output the CLI prompt */
static void
unix_cli_cli_prompt (unix_cli_file_t * cf, unix_file_t * uf)
{
unix_cli_main_t *cm = &unix_cli_main;
unix_vlib_cli_output_raw (cf, uf, cm->cli_prompt, vec_len (cm->cli_prompt));
}
/** @brief Output a pager prompt and show number of buffered lines */
static void
unix_cli_pager_prompt (unix_cli_file_t * cf, unix_file_t * uf)
{
u8 *prompt;
u32 h;
h = cf->pager_start + (cf->height - 1);
if (h > vec_len (cf->pager_index))
h = vec_len (cf->pager_index);
prompt = format (0, "\r%s-- more -- (%d-%d/%d)%s",
cf->ansi_capable ? ANSI_BOLD : "",
cf->pager_start + 1,
h,
vec_len (cf->pager_index),
cf->ansi_capable ? ANSI_RESET : "");
unix_vlib_cli_output_cooked (cf, uf, prompt, vec_len (prompt));
vec_free (prompt);
}
/** @brief Output a pager "skipping" message */
static void
unix_cli_pager_message (unix_cli_file_t * cf, unix_file_t * uf,
char *message, char *postfix)
{
u8 *prompt;
prompt = format (0, "\r%s-- %s --%s%s",
cf->ansi_capable ? ANSI_BOLD : "",
message, cf->ansi_capable ? ANSI_RESET : "", postfix);
unix_vlib_cli_output_cooked (cf, uf, prompt, vec_len (prompt));
vec_free (prompt);
}
/** @brief Erase the printed pager prompt */
static void
unix_cli_pager_prompt_erase (unix_cli_file_t * cf, unix_file_t * uf)
{
if (cf->ansi_capable)
{
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\r", 1);
unix_vlib_cli_output_cooked (cf, uf,
(u8 *) ANSI_CLEARLINE,
sizeof (ANSI_CLEARLINE) - 1);
}
else
{
int i;
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\r", 1);
for (i = 0; i < cf->width - 1; i++)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\r", 1);
}
}
/** @brief Uses an ANSI escape sequence to move the cursor */
static void
unix_cli_ansi_cursor (unix_cli_file_t * cf, unix_file_t * uf, u16 x, u16 y)
{
u8 *str;
str = format (0, "%s%d;%dH", CSI, y, x);
unix_vlib_cli_output_cooked (cf, uf, str, vec_len (str));
vec_free (str);
}
/** Redraw the currently displayed page of text.
* @param cf CLI session to redraw the pager buffer of.
* @param uf Unix file of the CLI session.
*/
static void
unix_cli_pager_redraw (unix_cli_file_t * cf, unix_file_t * uf)
{
unix_cli_pager_index_t *pi = NULL;
u8 *line = NULL;
word i;
/* No active pager? Do nothing. */
if (!vec_len (cf->pager_index))
return;
if (cf->ansi_capable)
{
/* If we have ANSI, send the clear screen sequence */
unix_vlib_cli_output_cooked (cf, uf,
(u8 *) ANSI_CLEAR,
sizeof (ANSI_CLEAR) - 1);
}
else
{
/* Otherwise make sure we're on a blank line */
unix_cli_pager_prompt_erase (cf, uf);
}
/* (Re-)send the current page of content */
for (i = 0; i < cf->height - 1 &&
i + cf->pager_start < vec_len (cf->pager_index); i++)
{
pi = &cf->pager_index[cf->pager_start + i];
line = cf->pager_vector[pi->line] + pi->offset;
unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
}
/* if the last line didn't end in newline, add a newline */
if (pi && line[pi->length - 1] != '\n')
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
unix_cli_pager_prompt (cf, uf);
}
/** @brief Process and add a line to the pager index.
* In normal operation this function will take the given character string
* found in @c line and with length @c len_or_index and iterates the over the
* contents, adding each line of text discovered within it to the
* pager index. Lines are identified by newlines ("<code>\\n</code>") and by
* strings longer than the width of the terminal.
*
* If instead @c line is @c NULL then @c len_or_index is taken to mean the
* index of an existing line in the pager buffer; this simply means that the
* input line does not need to be cloned since we alreayd have it. This is
* typical if we are reindexing the pager buffer.
*
* @param cf The CLI session whose pager we are adding to.
* @param line The string of text to be indexed into the pager buffer.
* If @c line is @c NULL then the mode of operation
* changes slightly; see the description above.
* @param len_or_index If @c line is a pointer to a string then this parameter
* indicates the length of that string; Otherwise this
* value provides the index in the pager buffer of an
* existing string to be indexed.
*/
static void
unix_cli_pager_add_line (unix_cli_file_t * cf, u8 * line, word len_or_index)
{
u8 *p;
word i, j, k;
word line_index, len;
u32 width = cf->width;
unix_cli_pager_index_t *pi;
if (line == NULL)
{
/* Use a line already in the pager buffer */
line_index = len_or_index;
p = cf->pager_vector[line_index];
len = vec_len (p);
}
else
{
len = len_or_index;
/* Add a copy of the raw string to the pager buffer */
p = vec_new (u8, len);
clib_memcpy (p, line, len);
/* store in pager buffer */
line_index = vec_len (cf->pager_vector);
vec_add1 (cf->pager_vector, p);
}
i = 0;
while (i < len)
{
/* Find the next line, or run to terminal width, or run to EOL */
int l = len - i;
j = unix_vlib_findchr ((u8) '\n', p, l < width ? l : width);
if (j < l && p[j] == '\n') /* incl \n */
j++;
/* Add the line to the index */
k = vec_len (cf->pager_index);
vec_validate (cf->pager_index, k);
pi = &cf->pager_index[k];
pi->line = line_index;
pi->offset = i;
pi->length = j;
i += j;
p += j;
}
}
/** @brief Reindex entire pager buffer.
* Resets the current pager index and then re-adds the lines in the pager
* buffer to the index.
*
* Additionally this function attempts to retain the current page start
* line offset by searching for the same top-of-screen line in the new index.
*
* @param cf The CLI session whose pager buffer should be reindexed.
*/
static void
unix_cli_pager_reindex (unix_cli_file_t * cf)
{
word i, old_line, old_offset;
unix_cli_pager_index_t *pi;
/* If there is nothing in the pager buffer then make sure the index
* is empty and move on.
*/
if (cf->pager_vector == 0)
{
vec_reset_length (cf->pager_index);
return;
}
/* Retain a pointer to the current page start line so we can
* find it later
*/
pi = &cf->pager_index[cf->pager_start];
old_line = pi->line;
old_offset = pi->offset;
/* Re-add the buffered lines to the index */
vec_reset_length (cf->pager_index);
vec_foreach_index (i, cf->pager_vector)
{
unix_cli_pager_add_line (cf, NULL, i);
}
/* Attempt to re-locate the previously stored page start line */
vec_foreach_index (i, cf->pager_index)
{
pi = &cf->pager_index[i];
if (pi->line == old_line &&
(pi->offset <= old_offset || pi->offset + pi->length > old_offset))
{
/* Found it! */
cf->pager_start = i;
break;
}
}
/* In case the start line was not found (rare), ensure the pager start
* index is within bounds
*/
if (cf->pager_start >= vec_len (cf->pager_index))
{
if (!cf->height || vec_len (cf->pager_index) < (cf->height - 1))
cf->pager_start = 0;
else
cf->pager_start = vec_len (cf->pager_index) - (cf->height - 1);
}
}
/** VLIB CLI output function.
*
* If the terminal has a pager configured then this function takes care
* of collating output into the pager buffer; ensuring only the first page
* is displayed and any lines in excess of the first page are buffered.
*
* If the maximum number of index lines in the buffer is exceeded then the
* pager is cancelled and the contents of the current buffer are sent to the
* terminal.
*
* If there is no pager configured then the output is sent directly to the
* terminal.
*
* @param cli_file_index Index of the CLI session where this output is
* directed.
* @param buffer String of printabe bytes to be output.
* @param buffer_bytes The number of bytes in @c buffer to be output.
*/
static void
unix_vlib_cli_output (uword cli_file_index, u8 * buffer, uword buffer_bytes)
{
unix_main_t *um = &unix_main;
unix_cli_main_t *cm = &unix_cli_main;
unix_cli_file_t *cf;
unix_file_t *uf;
cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
uf = pool_elt_at_index (um->file_pool, cf->unix_file_index);
if (cf->no_pager || um->cli_pager_buffer_limit == 0 || cf->height == 0)
{
unix_vlib_cli_output_cooked (cf, uf, buffer, buffer_bytes);
}
else
{
word row = vec_len (cf->pager_index);
u8 *line;
unix_cli_pager_index_t *pi;
/* Index and add the output lines to the pager buffer. */
unix_cli_pager_add_line (cf, buffer, buffer_bytes);
/* Now iterate what was added to display the lines.
* If we reach the bottom of the page, display a prompt.
*/
while (row < vec_len (cf->pager_index))
{
if (row < cf->height - 1)
{
/* output this line */
pi = &cf->pager_index[row];
line = cf->pager_vector[pi->line] + pi->offset;
unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
/* if the last line didn't end in newline, and we're at the
* bottom of the page, add a newline */
if (line[pi->length - 1] != '\n' && row == cf->height - 2)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
}
else
{
/* Display the pager prompt every 10 lines */
if (!(row % 10))
unix_cli_pager_prompt (cf, uf);
}
row++;
}
/* Check if we went over the pager buffer limit */
if (vec_len (cf->pager_index) > um->cli_pager_buffer_limit)
{
/* Stop using the pager for the remainder of this CLI command */
cf->no_pager = 2;
/* If we likely printed the prompt, erase it */
if (vec_len (cf->pager_index) > cf->height - 1)
unix_cli_pager_prompt_erase (cf, uf);
/* Dump out the contents of the buffer */
for (row = cf->pager_start + (cf->height - 1);
row < vec_len (cf->pager_index); row++)
{
pi = &cf->pager_index[row];
line = cf->pager_vector[pi->line] + pi->offset;
unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
}
unix_cli_pager_reset (cf);
}
}
}
/** Identify whether a terminal type is ANSI capable.
*
* Compares the string given in @c term with a list of terminal types known
* to support ANSI escape sequences.
*
* This list contains, for example, @c xterm, @c screen and @c ansi.
*
* @param term A string with a terminal type in it.
* @param len The length of the string in @c term.
*
* @return @c 1 if the terminal type is recognized as supporting ANSI
* terminal sequences; @c 0 otherwise.
*/
static u8
unix_cli_terminal_type (u8 * term, uword len)
{
/* This may later be better done as a hash of some sort. */
#define _(a) do { \
if (strncasecmp(a, (char *)term, (size_t)len) == 0) return 1; \
} while(0)
_("xterm");
_("xterm-color");
_("xterm-256color"); /* iTerm on Mac */
_("screen");
_("ansi"); /* Microsoft Telnet */
#undef _
return 0;
}
/** @brief Emit initial welcome banner and prompt on a connection. */
static void
unix_cli_file_welcome (unix_cli_main_t * cm, unix_cli_file_t * cf)
{
unix_main_t *um = &unix_main;
unix_file_t *uf = pool_elt_at_index (um->file_pool, cf->unix_file_index);
unix_cli_banner_t *banner;
int i, len;
/*
* Put the first bytes directly into the buffer so that further output is
* queued until everything is ready. (oterwise initial prompt can appear
* mid way through VPP initialization)
*/
unix_cli_add_pending_output (uf, cf, (u8 *) "\r", 1);
if (!um->cli_no_banner)
{
if (cf->ansi_capable)
{
banner = unix_cli_banner_color;
len = ARRAY_LEN (unix_cli_banner_color);
}
else
{
banner = unix_cli_banner;
len = ARRAY_LEN (unix_cli_banner);
}
for (i = 0; i < len; i++)
{
unix_vlib_cli_output_cooked (cf, uf,
banner[i].line, banner[i].length);
}
}
/* Prompt. */
unix_cli_cli_prompt (cf, uf);
cf->started = 1;
}
/** @brief A failsafe triggered on a timer to ensure we send the prompt
* to telnet sessions that fail to negotiate the terminal type. */
static void
unix_cli_file_welcome_timer (any arg, f64 delay)
{
unix_cli_main_t *cm = &unix_cli_main;
unix_cli_file_t *cf;
(void) delay;
/* Check the connection didn't close already */
if (pool_is_free_index (cm->cli_file_pool, (uword) arg))
return;
cf = pool_elt_at_index (cm->cli_file_pool, (uword) arg);
if (!cf->started)
unix_cli_file_welcome (cm, cf);
}
/** @brief A mostly no-op Telnet state machine.
* Process Telnet command bytes in a way that ensures we're mostly
* transparent to the Telnet protocol. That is, it's mostly a no-op.
*
* @return -1 if we need more bytes, otherwise a positive integer number of
* bytes to consume from the input_vector, not including the initial
* IAC byte.
*/
static i32
unix_cli_process_telnet (unix_main_t * um,
unix_cli_file_t * cf,
unix_file_t * uf, u8 * input_vector, uword len)
{
/* Input_vector starts at IAC byte.
* See if we have a complete message; if not, return -1 so we wait for more.
* if we have a complete message, consume those bytes from the vector.
*/
i32 consume = 0;
if (len == 1)
return -1; /* want more bytes */
switch (input_vector[1])
{
case IAC:
/* two IAC's in a row means to pass through 0xff.
* since that makes no sense here, just consume it.
*/
consume = 1;
break;
case WILL:
case WONT:
case DO:
case DONT:
/* Expect 3 bytes */
if (vec_len (input_vector) < 3)
return -1; /* want more bytes */
consume = 2;
break;
case SB:
{
/* Sub option - search ahead for IAC SE to end it */
i32 i;
for (i = 3; i < len && i < UNIX_CLI_MAX_DEPTH_TELNET; i++)
{
if (input_vector[i - 1] == IAC && input_vector[i] == SE)
{
/* We have a complete message; see if we care about it */
switch (input_vector[2])
{
case TELOPT_TTYPE:
if (input_vector[3] != 0)
break;
/* See if the terminal type is ANSI capable */
cf->ansi_capable =
unix_cli_terminal_type (input_vector + 4, i - 5);
/* If session not started, we can release the pause */
if (!cf->started)
/* Send the welcome banner and initial prompt */
unix_cli_file_welcome (&unix_cli_main, cf);
break;
case TELOPT_NAWS:
/* Window size */
if (i != 8) /* check message is correct size */
break;
cf->width =
clib_net_to_host_u16 (*((u16 *) (input_vector + 3)));
cf->height =
clib_net_to_host_u16 (*((u16 *) (input_vector + 5)));
/* reindex pager buffer */
unix_cli_pager_reindex (cf);
/* redraw page */
unix_cli_pager_redraw (cf, uf);
break;
default:
break;
}
/* Consume it all */
consume = i;
break;
}
}
if (i == UNIX_CLI_MAX_DEPTH_TELNET)
consume = 1; /* hit max search depth, advance one byte */
if (consume == 0)
return -1; /* want more bytes */
break;
}
case GA:
case EL:
case EC:
case AO:
case IP:
case BREAK:
case DM:
case NOP:
case SE:
case EOR:
case ABORT:
case SUSP:
case xEOF:
/* Simple one-byte messages */
consume = 1;
break;
case AYT:
/* Are You There - trigger a visible response */
consume = 1;
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "fd.io VPP\n", 10);
break;
default:
/* Unknown command! Eat the IAC byte */
break;
}
return consume;
}
/** @brief Process actionable input.
* Based on the \c action process the input; this typically involves
* searching the command history or editing the current command line.
*/
static int
unix_cli_line_process_one (unix_cli_main_t * cm,
unix_main_t * um,
unix_cli_file_t * cf,
unix_file_t * uf,
u8 input, unix_cli_parse_action_t action)
{
u8 *prev;
u8 *save = 0;
u8 **possible_commands;
int j, delta;
switch (action)
{
case UNIX_CLI_PARSE_ACTION_NOACTION:
break;
case UNIX_CLI_PARSE_ACTION_REVSEARCH:
case UNIX_CLI_PARSE_ACTION_FWDSEARCH:
if (!cf->has_history || !cf->history_limit)
break;
if (cf->search_mode == 0)
{
/* Erase the current command (if any) */
for (j = 0; j < (vec_len (cf->current_command)); j++)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b \b", 3);
vec_reset_length (cf->search_key);
vec_reset_length (cf->current_command);
if (action == UNIX_CLI_PARSE_ACTION_REVSEARCH)
cf->search_mode = -1;
else
cf->search_mode = 1;
cf->cursor = 0;
}
else
{
if (action == UNIX_CLI_PARSE_ACTION_REVSEARCH)
cf->search_mode = -1;
else
cf->search_mode = 1;
cf->excursion += cf->search_mode;
goto search_again;
}
break;
case UNIX_CLI_PARSE_ACTION_ERASELINELEFT:
/* Erase the command from the cursor to the start */
/* Shimmy forwards to the new end of line position */
delta = vec_len (cf->current_command) - cf->cursor;
for (j = cf->cursor; j > delta; j--)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
/* Zap from here to the end of what is currently displayed */
for (; j < (vec_len (cf->current_command)); j++)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
/* Get back to the start of the line */
for (j = 0; j < (vec_len (cf->current_command)); j++)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
j = vec_len (cf->current_command) - cf->cursor;
memmove (cf->current_command, cf->current_command + cf->cursor, j);
_vec_len (cf->current_command) = j;
/* Print the new contents */
unix_vlib_cli_output_cooked (cf, uf, cf->current_command, j);
/* Shimmy back to the start */
for (j = 0; j < (vec_len (cf->current_command)); j++)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
cf->cursor = 0;
cf->search_mode = 0;
break;
case UNIX_CLI_PARSE_ACTION_ERASELINERIGHT:
/* Erase the command from the cursor to the end */
/* Zap from cursor to end of what is currently displayed */
for (j = cf->cursor; j < (vec_len (cf->current_command)); j++)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
/* Get back to where we were */
for (j = cf->cursor; j < (vec_len (cf->current_command)); j++)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
/* Truncate the line at the cursor */
_vec_len (cf->current_command) = cf->cursor;
cf->search_mode = 0;
break;
case UNIX_CLI_PARSE_ACTION_LEFT:
if (cf->cursor > 0)
{
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
cf->cursor--;
}
cf->search_mode = 0;
break;
case UNIX_CLI_PARSE_ACTION_RIGHT:
if (cf->cursor < vec_len (cf->current_command))
{
/* have to emit the character under the cursor */
unix_vlib_cli_output_cooked (cf, uf,
cf->current_command + cf->cursor, 1);
cf->cursor++;
}
cf->search_mode = 0;
break;
case UNIX_CLI_PARSE_ACTION_UP:
case UNIX_CLI_PARSE_ACTION_DOWN:
if (!cf->has_history || !cf->history_limit)
break;
cf->search_mode = 0;
/* Erase the command */
for (j = cf->cursor; j < (vec_len (cf->current_command)); j++)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
for (j = 0; j < (vec_len (cf->current_command)); j++)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b \b", 3);
vec_reset_length (cf->current_command);
if (vec_len (cf->command_history))
{
if (action == UNIX_CLI_PARSE_ACTION_UP)
delta = -1;
else
delta = 1;
cf->excursion += delta;
if (cf->excursion == vec_len (cf->command_history))
{
/* down-arrowed to last entry - want a blank line */
_vec_len (cf->current_command) = 0;
}
else if (cf->excursion < 0)
{
/* up-arrowed over the start to the end, want a blank line */
cf->excursion = vec_len (cf->command_history);
_vec_len (cf->current_command) = 0;
}
else
{
if (cf->excursion > (i32) vec_len (cf->command_history) - 1)
/* down-arrowed past end - wrap to start */
cf->excursion = 0;
/* Print the command at the current position */
prev = cf->command_history[cf->excursion];
vec_validate (cf->current_command, vec_len (prev) - 1);
clib_memcpy (cf->current_command, prev, vec_len (prev));
_vec_len (cf->current_command) = vec_len (prev);
unix_vlib_cli_output_cooked (cf, uf, cf->current_command,
vec_len (cf->current_command));
}
cf->cursor = vec_len (cf->current_command);
break;
}
break;
case UNIX_CLI_PARSE_ACTION_HOME:
if (vec_len (cf->current_command) && cf->cursor > 0)
{
while (cf->cursor)
{
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
cf->cursor--;
}
}
cf->search_mode = 0;
break;
case UNIX_CLI_PARSE_ACTION_END:
if (vec_len (cf->current_command) &&
cf->cursor < vec_len (cf->current_command))
{
unix_vlib_cli_output_cooked (cf, uf,
cf->current_command + cf->cursor,
vec_len (cf->current_command) -
cf->cursor);
cf->cursor = vec_len (cf->current_command);
}
cf->search_mode = 0;
break;
case UNIX_CLI_PARSE_ACTION_WORDLEFT:
if (vec_len (cf->current_command) && cf->cursor > 0)
{
j = cf->cursor;
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
j--;
while (j && isspace (cf->current_command[j]))
{
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
j--;
}
while (j && !isspace (cf->current_command[j]))
{
if (isspace (cf->current_command[j - 1]))
break;
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
j--;
}
cf->cursor = j;
}
cf->search_mode = 0;
break;
case UNIX_CLI_PARSE_ACTION_WORDRIGHT:
if (vec_len (cf->current_command) &&
cf->cursor < vec_len (cf->current_command))
{
int e = vec_len (cf->current_command);
j = cf->cursor;
while (j < e && !isspace (cf->current_command[j]))
j++;
while (j < e && isspace (cf->current_command[j]))
j++;
unix_vlib_cli_output_cooked (cf, uf,
cf->current_command + cf->cursor,
j - cf->cursor);
cf->cursor = j;
}
cf->search_mode = 0;
break;
case UNIX_CLI_PARSE_ACTION_ERASE:
if (vec_len (cf->current_command))
{
if (cf->cursor == vec_len (cf->current_command))
{
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b \b", 3);
_vec_len (cf->current_command)--;
cf->cursor--;
}
else if (cf->cursor > 0)
{
/* shift everything at & to the right of the cursor left by 1 */
j = vec_len (cf->current_command) - cf->cursor;
memmove (cf->current_command + cf->cursor - 1,
cf->current_command + cf->cursor, j);
_vec_len (cf->current_command)--;
cf->cursor--;
/* redraw the rest of the line */
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
unix_vlib_cli_output_cooked (cf, uf,
cf->current_command + cf->cursor,
j);
unix_vlib_cli_output_cooked (cf, uf, (u8 *) " \b\b", 3);
/* and shift the terminal cursor back where it should be */
while (--j)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
}
}
cf->search_mode = 0;
cf->excursion = 0;
vec_reset_length (cf->search_key);
break;
case UNIX_CLI_PARSE_ACTION_ERASERIGHT:
if (vec_len (cf->current_command))
{
if (cf->cursor < vec_len (cf->current_command))
{
/* shift everything to the right of the cursor left by 1 */
j = vec_len (cf->current_command) - cf->cursor - 1;
memmove (cf->current_command + cf->cursor,
cf->current_command + cf->cursor + 1, j);
_vec_len (cf->current_command)--;
/* redraw the rest of the line */
unix_vlib_cli_output_cooked (cf, uf,
cf->current_command + cf->cursor,
j);
unix_vlib_cli_output_cooked (cf, uf, (u8 *) " \b", 2);
/* and shift the terminal cursor back where it should be */
if (j)
{
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
while (--j)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
}
}
}
else if (input == 'D' - '@')
{
/* ^D with no command entered = quit */
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "quit\n", 5);
vlib_process_signal_event (um->vlib_main,
vlib_current_process (um->vlib_main),
UNIX_CLI_PROCESS_EVENT_QUIT,
cf - cm->cli_file_pool);
}
cf->search_mode = 0;
cf->excursion = 0;
vec_reset_length (cf->search_key);
break;
case UNIX_CLI_PARSE_ACTION_CLEAR:
/* If we're in ANSI mode, clear the screen.
* Then redraw the prompt and any existing command input, then put
* the cursor back where it was in that line.
*/
if (cf->ansi_capable)
unix_vlib_cli_output_cooked (cf, uf,
(u8 *) ANSI_CLEAR,
sizeof (ANSI_CLEAR) - 1);
else
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
unix_vlib_cli_output_raw (cf, uf,
cm->cli_prompt, vec_len (cm->cli_prompt));
unix_vlib_cli_output_raw (cf, uf,
cf->current_command,
vec_len (cf->current_command));
for (j = cf->cursor; j < vec_len (cf->current_command); j++)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
break;
case UNIX_CLI_PARSE_ACTION_TAB:
if (cf->cursor < vec_len (cf->current_command))
{
/* if we are in the middle of a line, complete only if
* the cursor points to whitespace */
if (isspace (cf->current_command[cf->cursor]))
{
/* save and clear any input that is after the cursor */
vec_resize (save, vec_len (cf->current_command) - cf->cursor);
clib_memcpy (save, cf->current_command + cf->cursor,
vec_len (cf->current_command) - cf->cursor);
_vec_len (cf->current_command) = cf->cursor;
}
else
{
unix_vlib_cli_output_raw (cf, uf, (u8 *) "\a", 1);
break;
}
}
possible_commands =
vlib_cli_get_possible_completions (cf->current_command);
if (vec_len (possible_commands) == 1)
{
u32 j = cf->cursor;
u8 *completed = possible_commands[0];
/* find the last word of current_command */
while (j >= 1 && !isspace (cf->current_command[j - 1]))
{
j--;
unix_vlib_cli_output_raw (cf, uf, (u8 *) "\b", 1);
}
_vec_len (cf->current_command) = j;
/* replace it with the newly expanded command */
vec_append (cf->current_command, completed);
/* echo to the terminal */
unix_vlib_cli_output_raw (cf, uf, completed, vec_len (completed));
/* add one trailing space if needed */
if (vec_len (save) == 0)
{
vec_add1 (cf->current_command, ' ');
unix_vlib_cli_output_raw (cf, uf, (u8 *) " ", 1);
}
cf->cursor = vec_len (cf->current_command);
}
else if (vec_len (possible_commands) >= 2)
{
u8 **possible_command;
uword max_command_len = 0, min_command_len = ~0;
u32 i, j;
vec_foreach (possible_command, possible_commands)
{
if (vec_len (*possible_command) > max_command_len)
{
max_command_len = vec_len (*possible_command);
}
if (vec_len (*possible_command) < min_command_len)
{
min_command_len = vec_len (*possible_command);
}
}
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
i = 0;
vec_foreach (possible_command, possible_commands)
{
if (i + max_command_len >= cf->width)
{
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
i = 0;
}
unix_vlib_cli_output_raw (cf, uf, *possible_command,
vec_len (*possible_command));
for (j = vec_len (*possible_command); j < max_command_len + 2;
j++)
{
unix_vlib_cli_output_raw (cf, uf, (u8 *) " ", 1);
}
i += max_command_len + 2;
}
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
/* rewrite prompt */
unix_cli_cli_prompt (cf, uf);
unix_vlib_cli_output_raw (cf, uf, cf->current_command,
vec_len (cf->current_command));
/* count length of last word */
j = cf->cursor;
i = 0;
while (j >= 1 && !isspace (cf->current_command[j - 1]))
{
j--;
i++;
}
/* determine smallest common command */
for (; i < min_command_len; i++)
{
u8 common = '\0';
int stop = 0;
vec_foreach (possible_command, possible_commands)
{
if (common == '\0')
{
common = (*possible_command)[i];
}
else if (common != (*possible_command)[i])
{
stop = 1;
break;
}
}
if (!stop)
{
vec_add1 (cf->current_command, common);
cf->cursor++;
unix_vlib_cli_output_raw (cf, uf, (u8 *) & common, 1);
}
else
{
break;
}
}
}
else
{
unix_vlib_cli_output_raw (cf, uf, (u8 *) "\a", 1);
}
if (vec_len (save) > 0)
{
/* restore remaining input if tab was hit in the middle of a line */
unix_vlib_cli_output_raw (cf, uf, save, vec_len (save));
for (j = 0; j < vec_len (save); j++)
{
unix_vlib_cli_output_raw (cf, uf, (u8 *) "\b", 1);
}
vec_append (cf->current_command, save);
vec_free (save);
}
vec_free (possible_commands);
break;
case UNIX_CLI_PARSE_ACTION_YANK:
/* TODO */
break;
case UNIX_CLI_PARSE_ACTION_PAGER_QUIT:
pager_quit:
unix_cli_pager_prompt_erase (cf, uf);
unix_cli_pager_reset (cf);
unix_cli_cli_prompt (cf, uf);
break;
case UNIX_CLI_PARSE_ACTION_PAGER_NEXT:
case UNIX_CLI_PARSE_ACTION_PAGER_PGDN:
/* show next page of the buffer */
if (cf->height + cf->pager_start < vec_len (cf->pager_index))
{
u8 *line = NULL;
unix_cli_pager_index_t *pi = NULL;
int m = cf->pager_start + (cf->height - 1);
unix_cli_pager_prompt_erase (cf, uf);
for (j = m;
j < vec_len (cf->pager_index) && cf->pager_start < m;
j++, cf->pager_start++)
{
pi = &cf->pager_index[j];
line = cf->pager_vector[pi->line] + pi->offset;
unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
}
/* if the last line didn't end in newline, add a newline */
if (pi && line[pi->length - 1] != '\n')
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
unix_cli_pager_prompt (cf, uf);
}
else
{
if (action == UNIX_CLI_PARSE_ACTION_PAGER_NEXT)
/* no more in buffer, exit, but only if it was <space> */
goto pager_quit;
}
break;
case UNIX_CLI_PARSE_ACTION_PAGER_DN:
case UNIX_CLI_PARSE_ACTION_PAGER_CRLF:
/* display the next line of the buffer */
if (cf->pager_start < vec_len (cf->pager_index) - (cf->height - 1))
{
u8 *line;
unix_cli_pager_index_t *pi;
unix_cli_pager_prompt_erase (cf, uf);
pi = &cf->pager_index[cf->pager_start + (cf->height - 1)];
line = cf->pager_vector[pi->line] + pi->offset;
unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
cf->pager_start++;
/* if the last line didn't end in newline, add a newline */
if (line[pi->length - 1] != '\n')
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
unix_cli_pager_prompt (cf, uf);
}
else
{
if (action == UNIX_CLI_PARSE_ACTION_PAGER_CRLF)
/* no more in buffer, exit, but only if it was <enter> */
goto pager_quit;
}
break;
case UNIX_CLI_PARSE_ACTION_PAGER_UP:
/* scroll the page back one line */
if (cf->pager_start > 0)
{
u8 *line = NULL;
unix_cli_pager_index_t *pi = NULL;
cf->pager_start--;
if (cf->ansi_capable)
{
pi = &cf->pager_index[cf->pager_start];
line = cf->pager_vector[pi->line] + pi->offset;
unix_cli_pager_prompt_erase (cf, uf);
unix_vlib_cli_output_cooked (cf, uf, (u8 *) ANSI_SCROLLDN,
sizeof (ANSI_SCROLLDN) - 1);
unix_vlib_cli_output_cooked (cf, uf, (u8 *) ANSI_SAVECURSOR,
sizeof (ANSI_SAVECURSOR) - 1);
unix_cli_ansi_cursor (cf, uf, 1, 1);
unix_vlib_cli_output_cooked (cf, uf, (u8 *) ANSI_CLEARLINE,
sizeof (ANSI_CLEARLINE) - 1);
unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
unix_vlib_cli_output_cooked (cf, uf, (u8 *) ANSI_RESTCURSOR,
sizeof (ANSI_RESTCURSOR) - 1);
unix_cli_pager_prompt_erase (cf, uf);
unix_cli_pager_prompt (cf, uf);
}
else
{
int m = cf->pager_start + (cf->height - 1);
unix_cli_pager_prompt_erase (cf, uf);
for (j = cf->pager_start;
j < vec_len (cf->pager_index) && j < m; j++)
{
pi = &cf->pager_index[j];
line = cf->pager_vector[pi->line] + pi->offset;
unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
}
/* if the last line didn't end in newline, add a newline */
if (pi && line[pi->length - 1] != '\n')
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
unix_cli_pager_prompt (cf, uf);
}
}
break;
case UNIX_CLI_PARSE_ACTION_PAGER_TOP:
/* back to the first page of the buffer */
if (cf->pager_start > 0)
{
u8 *line = NULL;
unix_cli_pager_index_t *pi = NULL;
cf->pager_start = 0;
int m = cf->pager_start + (cf->height - 1);
unix_cli_pager_prompt_erase (cf, uf);
for (j = cf->pager_start; j < vec_len (cf->pager_index) && j < m;
j++)
{
pi = &cf->pager_index[j];
line = cf->pager_vector[pi->line] + pi->offset;
unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
}
/* if the last line didn't end in newline, add a newline */
if (pi && line[pi->length - 1] != '\n')
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
unix_cli_pager_prompt (cf, uf);
}
break;
case UNIX_CLI_PARSE_ACTION_PAGER_BOTTOM:
/* skip to the last page of the buffer */
if (cf->pager_start < vec_len (cf->pager_index) - (cf->height - 1))
{
u8 *line = NULL;
unix_cli_pager_index_t *pi = NULL;
cf->pager_start = vec_len (cf->pager_index) - (cf->height - 1);
unix_cli_pager_prompt_erase (cf, uf);
unix_cli_pager_message (cf, uf, "skipping", "\n");
for (j = cf->pager_start; j < vec_len (cf->pager_index); j++)
{
pi = &cf->pager_index[j];
line = cf->pager_vector[pi->line] + pi->offset;
unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
}
/* if the last line didn't end in newline, add a newline */
if (pi && line[pi->length - 1] != '\n')
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
unix_cli_pager_prompt (cf, uf);
}
break;
case UNIX_CLI_PARSE_ACTION_PAGER_PGUP:
/* wander back one page in the buffer */
if (cf->pager_start > 0)
{
u8 *line = NULL;
unix_cli_pager_index_t *pi = NULL;
int m;
if (cf->pager_start >= cf->height)
cf->pager_start -= cf->height - 1;
else
cf->pager_start = 0;
m = cf->pager_start + cf->height - 1;
unix_cli_pager_prompt_erase (cf, uf);
for (j = cf->pager_start; j < vec_len (cf->pager_index) && j < m;
j++)
{
pi = &cf->pager_index[j];
line = cf->pager_vector[pi->line] + pi->offset;
unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
}
/* if the last line didn't end in newline, add a newline */
if (pi && line[pi->length - 1] != '\n')
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
unix_cli_pager_prompt (cf, uf);
}
break;
case UNIX_CLI_PARSE_ACTION_PAGER_REDRAW:
/* Redraw the current pager screen */
unix_cli_pager_redraw (cf, uf);
break;
case UNIX_CLI_PARSE_ACTION_PAGER_SEARCH:
/* search forwards in the buffer */
break;
case UNIX_CLI_PARSE_ACTION_CRLF:
crlf:
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
if (cf->has_history && cf->history_limit)
{
if (cf->command_history
&& vec_len (cf->command_history) >= cf->history_limit)
{
vec_free (cf->command_history[0]);
vec_delete (cf->command_history, 1, 0);
}
/* Don't add blank lines to the cmd history */
if (vec_len (cf->current_command))
{
/* Don't duplicate the previous command */
j = vec_len (cf->command_history);
if (j == 0 ||
(vec_len (cf->current_command) !=
vec_len (cf->command_history[j - 1])
|| memcmp (cf->current_command, cf->command_history[j - 1],
vec_len (cf->current_command)) != 0))
{
/* copy the command to the history */
u8 *c = 0;
vec_append (c, cf->current_command);
vec_add1 (cf->command_history, c);
cf->command_number++;
}
}
cf->excursion = vec_len (cf->command_history);
}
cf->search_mode = 0;
vec_reset_length (cf->search_key);
cf->cursor = 0;
return 0;
case UNIX_CLI_PARSE_ACTION_PARTIALMATCH:
case UNIX_CLI_PARSE_ACTION_NOMATCH:
if (vec_len (cf->pager_index))
{
/* no-op for now */
}
else if (cf->has_history && cf->search_mode && isprint (input))
{
int k, limit, offset;
u8 *item;
vec_add1 (cf->search_key, input);
search_again:
for (j = 0; j < vec_len (cf->command_history); j++)
{
if (cf->excursion > (i32) vec_len (cf->command_history) - 1)
cf->excursion = 0;
else if (cf->excursion < 0)
cf->excursion = vec_len (cf->command_history) - 1;
item = cf->command_history[cf->excursion];
limit = (vec_len (cf->search_key) > vec_len (item)) ?
vec_len (item) : vec_len (cf->search_key);
for (offset = 0; offset <= vec_len (item) - limit; offset++)
{
for (k = 0; k < limit; k++)
{
if (item[k + offset] != cf->search_key[k])
goto next_offset;
}
goto found_at_offset;
next_offset:
;
}
goto next;
found_at_offset:
for (j = 0; j < vec_len (cf->current_command); j++)
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b \b", 3);
vec_validate (cf->current_command, vec_len (item) - 1);
clib_memcpy (cf->current_command, item, vec_len (item));
_vec_len (cf->current_command) = vec_len (item);
unix_vlib_cli_output_cooked (cf, uf, cf->current_command,
vec_len (cf->current_command));
cf->cursor = vec_len (cf->current_command);
goto found;
next:
cf->excursion += cf->search_mode;
}
unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\nNo match...", 12);
vec_reset_length (cf->search_key);
vec_reset_length (cf->current_command);
cf->search_mode = 0;
cf->cursor = 0;
goto crlf;
}
else if (isprint (input)) /* skip any errant control codes */
{
if (cf->cursor == vec_len (cf->current_command))
{
/* Append to end */
vec_add1 (cf->current_command, input);
cf->cursor++;
/* Echo the character back to the client */
unix_vlib_cli_output_raw (cf, uf, &input, 1);
}
else
{
/* Insert at cursor: resize +1 byte, move everything over */
j = vec_len (cf->current_command) - cf->cursor;
vec_add1 (cf->current_command, (u8) 'A');
memmove (cf->current_command + cf->cursor + 1,
cf->current_command + cf->cursor, j);
cf->current_command[cf->cursor] = input;
/* Redraw the line */
j++;
unix_vlib_cli_output_raw (cf, uf,
cf->current_command + cf->cursor, j);
/* Put terminal cursor back */
while (--j)
unix_vlib_cli_output_raw (cf, uf, (u8 *) "\b", 1);
cf->cursor++;
}
}
else
{
/* no-op - not printable or otherwise not actionable */
}
found:
break;
case UNIX_CLI_PARSE_ACTION_TELNETIAC:
break;
}
return 1;
}
/** @brief Process input bytes on a stream to provide line editing and
* command history in the CLI. */
static int
unix_cli_line_edit (unix_cli_main_t * cm,
unix_main_t * um, unix_cli_file_t * cf)
{
unix_file_t *uf = pool_elt_at_index (um->file_pool, cf->unix_file_index);
int i;
for (i = 0; i < vec_len (cf->input_vector); i++)
{
unix_cli_parse_action_t action;
i32 matched = 0;
unix_cli_parse_actions_t *a;
/* If we're in the pager mode, search the pager actions */
a =
vec_len (cf->pager_index) ? unix_cli_parse_pager :
unix_cli_parse_strings;
/* See if the input buffer is some sort of control code */
action = unix_cli_match_action (a, &cf->input_vector[i],
vec_len (cf->input_vector) - i,
&matched);
switch (action)
{
case UNIX_CLI_PARSE_ACTION_PARTIALMATCH:
if (i)
{
/* There was a partial match which means we need more bytes
* than the input buffer currently has.
* Since the bytes before here have been processed, shift
* the remaining contents to the start of the input buffer.
*/
vec_delete (cf->input_vector, i, 0);
}
return 1; /* wait for more */
case UNIX_CLI_PARSE_ACTION_TELNETIAC:
/* process telnet options */
matched = unix_cli_process_telnet (um, cf, uf,
cf->input_vector + i,
vec_len (cf->input_vector) - i);
if (matched < 0)
{
if (i)
{
/* There was a partial match which means we need more bytes
* than the input buffer currently has.
* Since the bytes before here have been processed, shift
* the remaining contents to the start of the input buffer.
*/
vec_delete (cf->input_vector, i, 0);
}
return 1; /* wait for more */
}
break;
default:
/* process the action */
if (!unix_cli_line_process_one (cm, um, cf, uf,
cf->input_vector[i], action))
{
/* CRLF found. Consume the bytes from the input_vector */
vec_delete (cf->input_vector, i + matched, 0);
/* And tell our caller to execute cf->input_command */
return 0;
}
}
i += matched;
}
vec_reset_length (cf->input_vector);
return 1;
}
/** @brief Process input to a CLI session. */
static void
unix_cli_process_input (unix_cli_main_t * cm, uword cli_file_index)
{
unix_main_t *um = &unix_main;
unix_file_t *uf;
unix_cli_file_t *cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
unformat_input_t input;
int vlib_parse_eval (u8 *);
more:
/* Try vlibplex first. Someday... */
if (0 && vlib_parse_eval (cf->input_vector) == 0)
goto done;
if (cf->line_mode)
{
/* just treat whatever we got as a complete line of input */
cf->current_command = cf->input_vector;
}
else
{
/* Line edit, echo, etc. */
if (unix_cli_line_edit (cm, um, cf))
/* want more input */
return;
}
if (um->log_fd)
{
static u8 *lv;
vec_reset_length (lv);
lv = format (lv, "%U[%d]: %v",
format_timeval, 0 /* current bat-time */ ,
0 /* current bat-format */ ,
cli_file_index, cf->input_vector);
{
int rv __attribute__ ((unused)) =
write (um->log_fd, lv, vec_len (lv));
}
}
/* Copy our input command to a new string */
unformat_init_vector (&input, cf->current_command);
/* Remove leading white space from input. */
(void) unformat (&input, "");
cm->current_input_file_index = cli_file_index;
cf->pager_start = 0; /* start a new pager session */
if (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT)
vlib_cli_input (um->vlib_main, &input, unix_vlib_cli_output,
cli_file_index);
/* Zero buffer since otherwise unformat_free will call vec_free on it. */
input.buffer = 0;
unformat_free (&input);
/* Re-fetch pointer since pool may have moved. */
cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
uf = pool_elt_at_index (um->file_pool, cf->unix_file_index);
done:
/* reset vector; we'll re-use it later */
if (cf->line_mode)
vec_reset_length (cf->input_vector);
else
vec_reset_length (cf->current_command);
if (cf->no_pager == 2)
{
/* Pager was programmatically disabled */
unix_cli_pager_message (cf, uf, "pager buffer overflowed", "\n");
cf->no_pager = um->cli_no_pager;
}
if (vec_len (cf->pager_index) == 0
|| vec_len (cf->pager_index) < cf->height)
{
/* There was no need for the pager */
unix_cli_pager_reset (cf);
/* Prompt. */
unix_cli_cli_prompt (cf, uf);
}
else
{
/* Display the pager prompt */
unix_cli_pager_prompt (cf, uf);
}
/* Any residual data in the input vector? */
if (vec_len (cf->input_vector))
goto more;
}
/** Destroy a CLI session.
* @note If we destroy the @c stdin session this additionally signals
* the shutdown of VPP.
*/
static void
unix_cli_kill (unix_cli_main_t * cm, uword cli_file_index)
{
unix_main_t *um = &unix_main;
unix_cli_file_t *cf;
unix_file_t *uf;
int i;
cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
uf = pool_elt_at_index (um->file_pool, cf->unix_file_index);
/* Quit/EOF on stdin means quit program. */
if (uf->file_descriptor == UNIX_CLI_STDIN_FD)
clib_longjmp (&um->vlib_main->main_loop_exit, VLIB_MAIN_LOOP_EXIT_CLI);
vec_free (cf->current_command);
vec_free (cf->search_key);
for (i = 0; i < vec_len (cf->command_history); i++)
vec_free (cf->command_history[i]);
vec_free (cf->command_history);
unix_file_del (um, uf);
unix_cli_file_free (cf);
pool_put (cm->cli_file_pool, cf);
}
/** Handle system events. */
static uword
unix_cli_process (vlib_main_t * vm,
vlib_node_runtime_t * rt, vlib_frame_t * f)
{
unix_cli_main_t *cm = &unix_cli_main;
uword i, *data = 0;
while (1)
{
unix_cli_process_event_type_t event_type;
vlib_process_wait_for_event (vm);
event_type = vlib_process_get_events (vm, &data);
switch (event_type)
{
case UNIX_CLI_PROCESS_EVENT_READ_READY:
for (i = 0; i < vec_len (data); i++)
unix_cli_process_input (cm, data[i]);
break;
case UNIX_CLI_PROCESS_EVENT_QUIT:
/* Kill this process. */
for (i = 0; i < vec_len (data); i++)
unix_cli_kill (cm, data[i]);
goto done;
}
if (data)
_vec_len (data) = 0;
}
done:
vec_free (data);
vlib_node_set_state (vm, rt->node_index, VLIB_NODE_STATE_DISABLED);
/* Add node index so we can re-use this process later. */
vec_add1 (cm->unused_cli_process_node_indices, rt->node_index);
return 0;
}
/** Called when a CLI session file descriptor can be written to without
* blocking. */
static clib_error_t *
unix_cli_write_ready (unix_file_t * uf)
{
unix_cli_main_t *cm = &unix_cli_main;
unix_cli_file_t *cf;
int n;
cf = pool_elt_at_index (cm->cli_file_pool, uf->private_data);
/* Flush output vector. */
n = write (uf->file_descriptor,
cf->output_vector, vec_len (cf->output_vector));
if (n < 0 && errno != EAGAIN)
return clib_error_return_unix (0, "write");
else if (n > 0)
unix_cli_del_pending_output (uf, cf, n);
return /* no error */ 0;
}
/** Called when a CLI session file descriptor has data to be read. */
static clib_error_t *
unix_cli_read_ready (unix_file_t * uf)
{
unix_main_t *um = &unix_main;
unix_cli_main_t *cm = &unix_cli_main;
unix_cli_file_t *cf;
uword l;
int n, n_read, n_try;
cf = pool_elt_at_index (cm->cli_file_pool, uf->private_data);
n = n_try = 4096;
while (n == n_try)
{
l = vec_len (cf->input_vector);
vec_resize (cf->input_vector, l + n_try);
n = read (uf->file_descriptor, cf->input_vector + l, n_try);
/* Error? */
if (n < 0 && errno != EAGAIN)
return clib_error_return_unix (0, "read");
n_read = n < 0 ? 0 : n;
_vec_len (cf->input_vector) = l + n_read;
}
if (!(n < 0))
vlib_process_signal_event (um->vlib_main,
cf->process_node_index,
(n_read == 0
? UNIX_CLI_PROCESS_EVENT_QUIT
: UNIX_CLI_PROCESS_EVENT_READ_READY),
/* event data */ uf->private_data);
return /* no error */ 0;
}
/** Store a new CLI session.
* @param name The name of the session.
* @param fd The file descriptor for the session I/O.
* @return The session ID.
*/
static u32
unix_cli_file_add (unix_cli_main_t * cm, char *name, int fd)
{
unix_main_t *um = &unix_main;
unix_cli_file_t *cf;
unix_file_t template = { 0 };
vlib_main_t *vm = um->vlib_main;
vlib_node_t *n;
name = (char *) format (0, "unix-cli-%s", name);
if (vec_len (cm->unused_cli_process_node_indices) > 0)
{
uword l = vec_len (cm->unused_cli_process_node_indices);
/* Find node and give it new name. */
n = vlib_get_node (vm, cm->unused_cli_process_node_indices[l - 1]);
vec_free (n->name);
n->name = (u8 *) name;
vlib_node_set_state (vm, n->index, VLIB_NODE_STATE_POLLING);
_vec_len (cm->unused_cli_process_node_indices) = l - 1;
}
else
{
static vlib_node_registration_t r = {
.function = unix_cli_process,
.type = VLIB_NODE_TYPE_PROCESS,
.process_log2_n_stack_bytes = 16,
};
r.name = name;
vlib_register_node (vm, &r);
vec_free (name);
n = vlib_get_node (vm, r.index);
}
pool_get (cm->cli_file_pool, cf);
memset (cf, 0, sizeof (*cf));
template.read_function = unix_cli_read_ready;
template.write_function = unix_cli_write_ready;
template.file_descriptor = fd;
template.private_data = cf - cm->cli_file_pool;
cf->process_node_index = n->index;
cf->unix_file_index = unix_file_add (um, &template);
cf->output_vector = 0;
cf->input_vector = 0;
vlib_start_process (vm, n->runtime_index);
vlib_process_t *p = vlib_get_process_from_node (vm, n);
p->output_function = unix_vlib_cli_output;
p->output_function_arg = cf - cm->cli_file_pool;
return cf - cm->cli_file_pool;
}
/** Telnet listening socket has a new connection. */
static clib_error_t *
unix_cli_listen_read_ready (unix_file_t * uf)
{
unix_main_t *um = &unix_main;
unix_cli_main_t *cm = &unix_cli_main;
clib_socket_t *s = &um->cli_listen_socket;
clib_socket_t client;
char *client_name;
clib_error_t *error;
unix_cli_file_t *cf;
u32 cf_index;
error = clib_socket_accept (s, &client);
if (error)
return error;
client_name = (char *) format (0, "%U%c", format_sockaddr, &client.peer, 0);
cf_index = unix_cli_file_add (cm, client_name, client.fd);
cf = pool_elt_at_index (cm->cli_file_pool, cf_index);
/* No longer need CLIB version of socket. */
clib_socket_free (&client);
vec_free (client_name);
/* if we're supposed to run telnet session in character mode (default) */
if (um->cli_line_mode == 0)
{
/*
* Set telnet client character mode, echo on, suppress "go-ahead".
* Technically these should be negotiated, but this works.
*/
u8 charmode_option[] = {
IAC, WONT, TELOPT_LINEMODE, /* server will do char-by-char */
IAC, DONT, TELOPT_LINEMODE, /* client should do char-by-char */
IAC, WILL, TELOPT_SGA, /* server willl supress GA */
IAC, DO, TELOPT_SGA, /* client should supress Go Ahead */
IAC, WILL, TELOPT_ECHO, /* server will do echo */
IAC, DONT, TELOPT_ECHO, /* client should not echo */
IAC, DO, TELOPT_TTYPE, /* client should tell us its term type */
IAC, SB, TELOPT_TTYPE, 1, IAC, SE, /* now tell me ttype */
IAC, DO, TELOPT_NAWS, /* client should tell us its window sz */
IAC, SB, TELOPT_NAWS, 1, IAC, SE, /* now tell me window size */
};
/* Enable history on this CLI */
cf->history_limit = um->cli_history_limit;
cf->has_history = cf->history_limit != 0;
/* Make sure this session is in line mode */
cf->line_mode = 0;
/* We need CRLF */
cf->crlf_mode = 1;
/* Setup the pager */
cf->no_pager = um->cli_no_pager;
uf = pool_elt_at_index (um->file_pool, cf->unix_file_index);
/* Send the telnet options */
unix_vlib_cli_output_raw (cf, uf, charmode_option,
ARRAY_LEN (charmode_option));
/* In case the client doesn't negotiate terminal type, use
* a timer to kick off the initial prompt. */
timer_call (unix_cli_file_welcome_timer, cf_index, 1);
}
return error;
}
/** The system terminal has informed us that the window size
* has changed.
*/
static void
unix_cli_resize_interrupt (int signum)
{
unix_main_t *um = &unix_main;
unix_cli_main_t *cm = &unix_cli_main;
unix_cli_file_t *cf = pool_elt_at_index (cm->cli_file_pool,
cm->stdin_cli_file_index);
unix_file_t *uf = pool_elt_at_index (um->file_pool, cf->unix_file_index);
struct winsize ws;
(void) signum;
/* Terminal resized, fetch the new size */
if (ioctl (UNIX_CLI_STDIN_FD, TIOCGWINSZ, &ws) < 0)
{
/* "Should never happen..." */
clib_unix_warning ("TIOCGWINSZ");
/* We can't trust ws.XXX... */
return;
}
cf->width = ws.ws_col;
cf->height = ws.ws_row;
/* Reindex the pager buffer */
unix_cli_pager_reindex (cf);
/* Redraw the page */
unix_cli_pager_redraw (cf, uf);
}
/** Handle configuration directives in the @em unix section. */
static clib_error_t *
unix_cli_config (vlib_main_t * vm, unformat_input_t * input)
{
unix_main_t *um = &unix_main;
unix_cli_main_t *cm = &unix_cli_main;
int flags;
clib_error_t *error = 0;
unix_cli_file_t *cf;
u32 cf_index;
struct termios tio;
struct sigaction sa;
struct winsize ws;
u8 *term;
/* We depend on unix flags being set. */
if ((error = vlib_call_config_function (vm, unix_config)))
return error;
if (um->flags & UNIX_FLAG_INTERACTIVE)
{
/* Set stdin to be non-blocking. */
if ((flags = fcntl (UNIX_CLI_STDIN_FD, F_GETFL, 0)) < 0)
flags = 0;
(void) fcntl (UNIX_CLI_STDIN_FD, F_SETFL, flags | O_NONBLOCK);
cf_index = unix_cli_file_add (cm, "stdin", UNIX_CLI_STDIN_FD);
cf = pool_elt_at_index (cm->cli_file_pool, cf_index);
cm->stdin_cli_file_index = cf_index;
/* If stdin is a tty and we are using chacracter mode, enable
* history on the CLI and set the tty line discipline accordingly. */
if (isatty (UNIX_CLI_STDIN_FD) && um->cli_line_mode == 0)
{
/* Capture terminal resize events */
memset (&sa, 0, sizeof (sa));
sa.sa_handler = unix_cli_resize_interrupt;
if (sigaction (SIGWINCH, &sa, 0) < 0)
clib_panic ("sigaction");
/* Retrieve the current terminal size */
ioctl (UNIX_CLI_STDIN_FD, TIOCGWINSZ, &ws);
cf->width = ws.ws_col;
cf->height = ws.ws_row;
if (cf->width == 0 || cf->height == 0)
/* We have a tty, but no size. Stick to line mode. */
goto notty;
/* Setup the history */
cf->history_limit = um->cli_history_limit;
cf->has_history = cf->history_limit != 0;
/* Setup the pager */
cf->no_pager = um->cli_no_pager;
/* We're going to be in char by char mode */
cf->line_mode = 0;
/* Save the original tty state so we can restore it later */
tcgetattr (UNIX_CLI_STDIN_FD, &um->tio_stdin);
um->tio_isset = 1;
/* Tweak the tty settings */
tio = um->tio_stdin;
/* echo off, canonical mode off, ext'd input processing off */
tio.c_lflag &= ~(ECHO | ICANON | IEXTEN);
tio.c_cc[VMIN] = 1; /* 1 byte at a time */
tio.c_cc[VTIME] = 0; /* no timer */
tcsetattr (UNIX_CLI_STDIN_FD, TCSAFLUSH, &tio);
/* See if we can do ANSI/VT100 output */
term = (u8 *) getenv ("TERM");
if (term != NULL)
cf->ansi_capable = unix_cli_terminal_type (term,
strlen ((char *)
term));
}
else
{
notty:
/* No tty, so make sure these things are off */
cf->no_pager = 1;
cf->history_limit = 0;
cf->has_history = 0;
cf->line_mode = 1;
}
/* Send banner and initial prompt */
unix_cli_file_welcome (cm, cf);
}
/* If we have socket config, LISTEN, otherwise, don't */
clib_socket_t *s = &um->cli_listen_socket;
if (s->config && s->config[0] != 0)
{
/* CLI listen. */
unix_file_t template = { 0 };
s->flags = SOCKET_IS_SERVER; /* listen, don't connect */
error = clib_socket_init (s);
if (error)
return error;
template.read_function = unix_cli_listen_read_ready;
template.file_descriptor = s->fd;
unix_file_add (um, &template);
}
/* Set CLI prompt. */
if (!cm->cli_prompt)
cm->cli_prompt = format (0, "VLIB: ");
return 0;
}
/*?
* This module has no configurable parameters.
?*/
VLIB_CONFIG_FUNCTION (unix_cli_config, "unix-cli");
/** Called when VPP is shutting down, this restores the system
* terminal state if previously saved.
*/
static clib_error_t *
unix_cli_exit (vlib_main_t * vm)
{
unix_main_t *um = &unix_main;
/* If stdin is a tty and we saved the tty state, reset the tty state */
if (isatty (UNIX_CLI_STDIN_FD) && um->tio_isset)
tcsetattr (UNIX_CLI_STDIN_FD, TCSAFLUSH, &um->tio_stdin);
return 0;
}
VLIB_MAIN_LOOP_EXIT_FUNCTION (unix_cli_exit);
/** Set the CLI prompt.
* @param prompt The C string to set the prompt to.
* @note This setting is global; it impacts all current
* and future CLI sessions.
*/
void
vlib_unix_cli_set_prompt (char *prompt)
{
char *fmt = (prompt[strlen (prompt) - 1] == ' ') ? "%s" : "%s ";
unix_cli_main_t *cm = &unix_cli_main;
if (cm->cli_prompt)
vec_free (cm->cli_prompt);
cm->cli_prompt = format (0, fmt, prompt);
}
/** CLI command to quit the terminal session.
* @note If this is a stdin session then this will
* shutdown VPP also.
*/
static clib_error_t *
unix_cli_quit (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
unix_cli_main_t *cm = &unix_cli_main;
vlib_process_signal_event (vm,
vlib_current_process (vm),
UNIX_CLI_PROCESS_EVENT_QUIT,
cm->current_input_file_index);
return 0;
}
/*?
* Terminates the current CLI session.
*
* If VPP is running in @em interactive mode and this is the console session
* (that is, the session on @c stdin) then this will also terminate VPP.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (unix_cli_quit_command, static) = {
.path = "quit",
.short_help = "Exit CLI",
.function = unix_cli_quit,
};
/* *INDENT-ON* */
/** CLI command to execute a VPP command script. */
static clib_error_t *
unix_cli_exec (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
char *file_name;
int fd;
unformat_input_t sub_input;
clib_error_t *error;
file_name = 0;
fd = -1;
error = 0;
if (!unformat (input, "%s", &file_name))
{
error = clib_error_return (0, "expecting file name, got `%U'",
format_unformat_error, input);
goto done;
}
fd = open (file_name, O_RDONLY);
if (fd < 0)
{
error = clib_error_return_unix (0, "failed to open `%s'", file_name);
goto done;
}
/* Make sure its a regular file. */
{
struct stat s;
if (fstat (fd, &s) < 0)
{
error = clib_error_return_unix (0, "failed to stat `%s'", file_name);
goto done;
}
if (!(S_ISREG (s.st_mode) || S_ISLNK (s.st_mode)))
{
error = clib_error_return (0, "not a regular file `%s'", file_name);
goto done;
}
}
unformat_init_unix_file (&sub_input, fd);
vlib_cli_input (vm, &sub_input, 0, 0);
unformat_free (&sub_input);
done:
if (fd > 0)
close (fd);
vec_free (file_name);
return error;
}
/*?
* Executes a sequence of CLI commands which are read from a file.
*
* If a command is unrecognised or otherwise invalid then the usual CLI
* feedback will be generated, however execution of subsequent commands
* from the file will continue.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_exec, static) = {
.path = "exec",
.short_help = "Execute commands from file",
.function = unix_cli_exec,
.is_mp_safe = 1,
};
/* *INDENT-ON* */
/** CLI command to show various unix error statistics. */
static clib_error_t *
unix_show_errors (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
unix_main_t *um = &unix_main;
clib_error_t *error = 0;
int i, n_errors_to_show;
unix_error_history_t *unix_errors = 0;
n_errors_to_show = 1 << 30;
if (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (!unformat (input, "%d", &n_errors_to_show))
{
error =
clib_error_return (0,
"expecting integer number of errors to show, got `%U'",
format_unformat_error, input);
goto done;
}
}
n_errors_to_show =
clib_min (ARRAY_LEN (um->error_history), n_errors_to_show);
i =
um->error_history_index >
0 ? um->error_history_index - 1 : ARRAY_LEN (um->error_history) - 1;
while (n_errors_to_show > 0)
{
unix_error_history_t *eh = um->error_history + i;
if (!eh->error)
break;
vec_add1 (unix_errors, eh[0]);
n_errors_to_show -= 1;
if (i == 0)
i = ARRAY_LEN (um->error_history) - 1;
else
i--;
}
if (vec_len (unix_errors) == 0)
vlib_cli_output (vm, "no Unix errors so far");
else
{
vlib_cli_output (vm, "%Ld total errors seen", um->n_total_errors);
for (i = vec_len (unix_errors) - 1; i >= 0; i--)
{
unix_error_history_t *eh = vec_elt_at_index (unix_errors, i);
vlib_cli_output (vm, "%U: %U",
format_time_interval, "h:m:s:u", eh->time,
format_clib_error, eh->error);
}
vlib_cli_output (vm, "%U: time now",
format_time_interval, "h:m:s:u", vlib_time_now (vm));
}
done:
vec_free (unix_errors);
return error;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_show_errors, static) = {
.path = "show unix-errors",
.short_help = "Show Unix system call error history",
.function = unix_show_errors,
};
/* *INDENT-ON* */
/** CLI command to show session command history. */
static clib_error_t *
unix_cli_show_history (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
unix_cli_main_t *cm = &unix_cli_main;
unix_cli_file_t *cf;
int i, j;
cf = pool_elt_at_index (cm->cli_file_pool, cm->current_input_file_index);
if (cf->has_history && cf->history_limit)
{
i = 1 + cf->command_number - vec_len (cf->command_history);
for (j = 0; j < vec_len (cf->command_history); j++)
vlib_cli_output (vm, "%d %v\n", i + j, cf->command_history[j]);
}
else
{
vlib_cli_output (vm, "History not enabled.\n");
}
return 0;
}
/*?
* Displays the command history for the current session, if any.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_cli_show_history, static) = {
.path = "history",
.short_help = "Show current session command history",
.function = unix_cli_show_history,
};
/* *INDENT-ON* */
/** CLI command to show terminal status. */
static clib_error_t *
unix_cli_show_terminal (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
unix_main_t *um = &unix_main;
unix_cli_main_t *cm = &unix_cli_main;
unix_cli_file_t *cf;
vlib_node_t *n;
cf = pool_elt_at_index (cm->cli_file_pool, cm->current_input_file_index);
n = vlib_get_node (vm, cf->process_node_index);
vlib_cli_output (vm, "Terminal name: %v\n", n->name);
vlib_cli_output (vm, "Terminal mode: %s\n", cf->line_mode ?
"line-by-line" : "char-by-char");
vlib_cli_output (vm, "Terminal width: %d\n", cf->width);
vlib_cli_output (vm, "Terminal height: %d\n", cf->height);
vlib_cli_output (vm, "ANSI capable: %s\n",
cf->ansi_capable ? "yes" : "no");
vlib_cli_output (vm, "History enabled: %s%s\n",
cf->has_history ? "yes" : "no", !cf->has_history
|| cf->history_limit ? "" :
" (disabled by history limit)");
if (cf->has_history)
vlib_cli_output (vm, "History limit: %d\n", cf->history_limit);
vlib_cli_output (vm, "Pager enabled: %s%s%s\n",
cf->no_pager ? "no" : "yes",
cf->no_pager
|| cf->height ? "" : " (disabled by terminal height)",
cf->no_pager
|| um->cli_pager_buffer_limit ? "" :
" (disabled by buffer limit)");
if (!cf->no_pager)
vlib_cli_output (vm, "Pager limit: %d\n", um->cli_pager_buffer_limit);
vlib_cli_output (vm, "CRLF mode: %s\n",
cf->crlf_mode ? "CR+LF" : "LF");
return 0;
}
/*?
* Displays various information about the state of the current terminal
* session.
*
* @cliexpar
* @cliexstart{show terminal}
* Terminal name: unix-cli-stdin
* Terminal mode: char-by-char
* Terminal width: 123
* Terminal height: 48
* ANSI capable: yes
* History enabled: yes
* History limit: 50
* Pager enabled: yes
* Pager limit: 100000
* CRLF mode: LF
* @cliexend
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_cli_show_terminal, static) = {
.path = "show terminal",
.short_help = "Show current session terminal settings",
.function = unix_cli_show_terminal,
};
/* *INDENT-ON* */
/** CLI command to set terminal pager settings. */
static clib_error_t *
unix_cli_set_terminal_pager (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unix_main_t *um = &unix_main;
unix_cli_main_t *cm = &unix_cli_main;
unix_cli_file_t *cf;
unformat_input_t _line_input, *line_input = &_line_input;
clib_error_t *error = 0;
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
cf = pool_elt_at_index (cm->cli_file_pool, cm->current_input_file_index);
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (line_input, "on"))
cf->no_pager = 0;
else if (unformat (line_input, "off"))
cf->no_pager = 1;
else if (unformat (line_input, "limit %u", &um->cli_pager_buffer_limit))
vlib_cli_output (vm,
"Pager limit set to %u lines; note, this is global.\n",
um->cli_pager_buffer_limit);
else
{
error = clib_error_return (0, "unknown parameter: `%U`",
format_unformat_error, line_input);
goto done;
}
}
done:
unformat_free (line_input);
return error;
}
/*?
* Enables or disables the terminal pager for this session. Generally
* this defaults to enabled.
*
* Additionally allows the pager buffer size to be set; though note that
* this value is set globally and not per session.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_cli_set_terminal_pager, static) = {
.path = "set terminal pager",
.short_help = "set terminal pager [on|off] [limit <lines>]",
.function = unix_cli_set_terminal_pager,
};
/* *INDENT-ON* */
/** CLI command to set terminal history settings. */
static clib_error_t *
unix_cli_set_terminal_history (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unix_cli_main_t *cm = &unix_cli_main;
unix_cli_file_t *cf;
unformat_input_t _line_input, *line_input = &_line_input;
u32 limit;
clib_error_t *error = 0;
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
cf = pool_elt_at_index (cm->cli_file_pool, cm->current_input_file_index);
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (line_input, "on"))
cf->has_history = 1;
else if (unformat (line_input, "off"))
cf->has_history = 0;
else if (unformat (line_input, "limit %u", &cf->history_limit))
;
else
{
error = clib_error_return (0, "unknown parameter: `%U`",
format_unformat_error, line_input);
goto done;
}
/* If we reduced history size, or turned it off, purge the history */
limit = cf->has_history ? cf->history_limit : 0;
while (cf->command_history && vec_len (cf->command_history) >= limit)
{
vec_free (cf->command_history[0]);
vec_delete (cf->command_history, 1, 0);
}
}
done:
unformat_free (line_input);
return error;
}
/*?
* Enables or disables the command history function of the current
* terminal. Generally this defaults to enabled.
*
* This command also allows the maximum size of the history buffer for
* this session to be altered.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_cli_set_terminal_history, static) = {
.path = "set terminal history",
.short_help = "set terminal history [on|off] [limit <lines>]",
.function = unix_cli_set_terminal_history,
};
/* *INDENT-ON* */
/** CLI command to set terminal ANSI settings. */
static clib_error_t *
unix_cli_set_terminal_ansi (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unix_cli_main_t *cm = &unix_cli_main;
unix_cli_file_t *cf;
cf = pool_elt_at_index (cm->cli_file_pool, cm->current_input_file_index);
if (unformat (input, "on"))
cf->ansi_capable = 1;
else if (unformat (input, "off"))
cf->ansi_capable = 0;
else
return clib_error_return (0, "unknown parameter: `%U`",
format_unformat_error, input);
return 0;
}
/*?
* Enables or disables the use of ANSI control sequences by this terminal.
* The default will vary based on terminal detection at the start of the
* session.
*
* ANSI control sequences are used in a small number of places to provide,
* for example, color text output and to control the cursor in the pager.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_cli_set_terminal_ansi, static) = {
.path = "set terminal ansi",
.short_help = "set terminal ansi [on|off]",
.function = unix_cli_set_terminal_ansi,
};
/* *INDENT-ON* */
static clib_error_t *
unix_cli_init (vlib_main_t * vm)
{
return 0;
}
VLIB_INIT_FUNCTION (unix_cli_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/