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/*
* Asynchronous readline-based interactive interface
*
* Actually not asynchronous so far, but intended to be.
*
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <readline/readline.h>
#include <readline/history.h>
#include <nftables.h>
#include <parser.h>
#include <erec.h>
#include <utils.h>
#include <iface.h>
#include <cli.h>
#define CMDLINE_HISTFILE ".nft.history"
static const struct input_descriptor indesc_cli = {
.type = INDESC_CLI,
.name = "<cli>",
};
static struct parser_state *state;
static struct output_ctx cli_octx;
static void *scanner;
static char histfile[PATH_MAX];
static char *multiline;
static bool eof;
static char *cli_append_multiline(char *line)
{
bool complete = false;
size_t len;
char *s;
if (line == NULL && multiline == NULL) {
eof = true;
return NULL;
}
len = strlen(line);
if (line[len - 1] == '\\') {
line[len - 1] = '\0';
len--;
} else if (multiline == NULL)
return line;
else
complete = 1;
if (multiline == NULL) {
multiline = line;
rl_save_prompt();
rl_clear_message();
rl_set_prompt(".... ");
} else {
len += strlen(multiline);
s = xmalloc(len + 1);
snprintf(s, len + 1, "%s%s", multiline, line);
xfree(multiline);
multiline = s;
}
line = NULL;
if (complete) {
line = multiline;
multiline = NULL;
rl_restore_prompt();
}
return line;
}
static void cli_complete(char *line)
{
const HIST_ENTRY *hist;
const char *c;
LIST_HEAD(msgs);
int len;
char *s;
if (line == NULL) {
printf("\n");
cli_exit();
exit(0);
}
line = cli_append_multiline(line);
if (line == NULL)
return;
for (c = line; *c != '\0'; c++)
if (!isspace(*c))
break;
if (*c == '\0')
return;
if (!strcmp(line, "quit")) {
cli_exit();
exit(0);
}
/* avoid duplicate history entries */
hist = history_get(history_length);
if (hist == NULL || strcmp(hist->line, line))
add_history(line);
len = strlen(line);
s = xmalloc(len + 2);
snprintf(s, len + 2, "%s\n", line);
xfree(line);
line = s;
parser_init(state, &msgs);
scanner_push_buffer(scanner, &indesc_cli, line);
nft_run(scanner, state, &msgs, &cli_octx);
erec_print_list(stdout, &msgs);
xfree(line);
cache_release();
iface_cache_release();
}
static char **cli_completion(const char *text, int start, int end)
{
return NULL;
}
void __fmtstring(1, 0) cli_display(const char *fmt, va_list ap)
{
int point, end;
char *buf;
point = rl_point;
end = rl_end;
rl_point = rl_end = 0;
rl_save_prompt();
rl_clear_message();
if (vasprintf(&buf, fmt, ap) < 0)
fprintf(rl_outstream, "cli_display: out of memory\n");
else {
fprintf(rl_outstream, "%s\n", buf);
xfree(buf);
}
rl_restore_prompt();
rl_point = point;
rl_end = end;
rl_forced_update_display();
}
int cli_init(struct parser_state *_state, struct output_ctx *octx)
{
const char *home;
cli_octx = *octx;
rl_readline_name = "nft";
rl_instream = stdin;
rl_outstream = stdout;
rl_callback_handler_install("nft> ", cli_complete);
rl_attempted_completion_function = cli_completion;
home = getenv("HOME");
if (home == NULL)
home = "";
snprintf(histfile, sizeof(histfile), "%s/%s", home, CMDLINE_HISTFILE);
read_history(histfile);
history_set_pos(history_length);
state = _state;
scanner = scanner_init(state);
while (!eof)
rl_callback_read_char();
return 0;
}
void cli_exit(void)
{
rl_callback_handler_remove();
rl_deprep_terminal();
write_history(histfile);
}
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