bird/nest/cli.c
Martin Mares bc2fb68098 Parse CLI commands. We use the same parser as for configuration files (because
we want to allow filter and similar complex constructs to be used in commands
and we should avoid code duplication), only with CLI_MARKER token prepended
before the whole input.

Defined macro CF_CLI(cmd, args, help) for defining CLI commands in .Y files.
The first argument specifies the command itself, the remaining two arguments
are copied to the help file (er, will be copied after the help file starts
to exist). This macro automatically creates a skeleton rule for the command,
you only need to append arguments as in:

	CF_CLI(STEAL MONEY, <$>, [[Steal <$> US dollars or equivalent in any other currency]]): NUM {
		cli_msg(0, "%d$ stolen", $3);
	} ;

Also don't forget to reset lexer state between inputs.
1999-10-31 17:47:47 +00:00

204 lines
3.4 KiB
C

/*
* BIRD Internet Routing Daemon -- Command-Line Interface
*
* (c) 1999 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "nest/bird.h"
#include "nest/cli.h"
#include "conf/conf.h"
#include "lib/string.h"
pool *cli_pool;
void
cli_printf(cli *c, int code, char *msg, ...)
{
va_list args;
byte buf[1024];
int cd = code;
int size, cnt;
struct cli_out *o;
va_start(args, msg);
if (cd < 0)
{
cd = -cd;
if (cd == c->last_reply)
size = bsprintf(buf, " ");
else
size = bsprintf(buf, "%04d-", cd);
}
else
size = bsprintf(buf, "%04d ", cd);
c->last_reply = cd;
cnt = bvsnprintf(buf+size, sizeof(buf)-size-1, msg, args);
if (cnt < 0)
{
cli_printf(c, code < 0 ? -8000 : 8000, "<line overflow>");
return;
}
size += cnt;
buf[size++] = '\n';
if (!(o = c->tx_write) || o->wpos + size > o->end)
{
if (!o && c->tx_buf)
o = c->tx_buf;
else
{
o = mb_alloc(c->pool, sizeof(struct cli_out) + CLI_TX_BUF_SIZE);
if (c->tx_write)
c->tx_write->next = o;
else
c->tx_buf = o;
o->next = NULL;
o->wpos = o->outpos = o->buf;
o->end = o->buf + CLI_TX_BUF_SIZE;
}
c->tx_write = o;
if (!c->tx_pos)
c->tx_pos = o;
}
memcpy(o->wpos, buf, size);
o->wpos += size;
}
static void
cli_hello(cli *c)
{
cli_printf(c, 1, "BIRD " BIRD_VERSION " ready.");
c->cont = NULL;
}
static void
cli_free_out(cli *c)
{
struct cli_out *o, *p;
if (o = c->tx_buf)
{
c->tx_write = NULL;
o->wpos = o->outpos = o->buf;
while (p = o->next)
{
o->next = p->next;
mb_free(p);
}
}
}
static byte *cli_rh_pos;
static unsigned int cli_rh_len;
static int cli_rh_trick_flag;
struct cli *this_cli;
static int
cli_cmd_read_hook(byte *buf, unsigned int max)
{
if (!cli_rh_trick_flag)
{
cli_rh_trick_flag = 1;
buf[0] = '!';
return 1;
}
if (max > cli_rh_len)
max = cli_rh_len;
memcpy(buf, cli_rh_pos, max);
cli_rh_pos += max;
cli_rh_len -= max;
return max;
}
static void
cli_command(struct cli *c)
{
struct config f;
int res;
f.pool = NULL;
f.mem = c->parser_pool;
cf_read_hook = cli_cmd_read_hook;
cli_rh_pos = c->rx_buf;
cli_rh_len = strlen(c->rx_buf);
cli_rh_trick_flag = 0;
this_cli = c;
res = cli_parse(&f);
lp_flush(c->parser_pool);
if (!res)
cli_printf(c, 9001, f.err_msg);
}
static int
cli_event(void *data)
{
cli *c = data;
int err;
if (c->tx_pos)
;
else if (c->cont)
c->cont(c);
else
{
err = cli_get_command(c);
if (!err)
return 0;
if (err < 0)
cli_printf(c, 9000, "Command too long");
else
cli_command(c);
}
if (cli_write(c))
{
cli_free_out(c);
return 1;
}
return 0;
}
cli *
cli_new(void *priv)
{
pool *p = rp_new(cli_pool, "CLI");
cli *c = mb_alloc(p, sizeof(cli));
c->pool = p;
c->priv = priv;
c->event = ev_new(p);
c->event->hook = cli_event;
c->event->data = c;
c->tx_buf = c->tx_pos = c->tx_write = NULL;
c->cont = cli_hello;
c->last_reply = 0;
c->parser_pool = lp_new(c->pool, 4096);
ev_schedule(c->event);
return c;
}
void
cli_kick(cli *c)
{
if (!c->cont && !c->tx_pos)
ev_schedule(c->event);
}
void
cli_written(cli *c)
{
cli_free_out(c);
ev_schedule(c->event);
}
void
cli_free(cli *c)
{
rfree(c->pool);
}
void
cli_init(void)
{
cli_pool = rp_new(&root_pool, "CLI");
}