bird/client/client.c

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/*
* BIRD Client
*
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* (c) 1999--2004 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
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#include <termios.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/types.h>
#include <readline/readline.h>
#include <readline/history.h>
#include <curses.h>
#include "nest/bird.h"
#include "lib/resource.h"
#include "lib/string.h"
#include "client/client.h"
#include "sysdep/unix/unix.h"
static char *opt_list = "s:v";
static int verbose;
static char *server_path = PATH_CONTROL_SOCKET;
static int server_fd;
static byte server_read_buf[4096];
static byte *server_read_pos = server_read_buf;
#define STATE_PROMPT 0
#define STATE_CMD_SERVER 1
#define STATE_CMD_USER 2
static int input_initialized;
static int input_hidden_end;
static int cstate = STATE_CMD_SERVER;
static int nstate = STATE_CMD_SERVER;
static int num_lines, skip_input, interactive;
/*** Parsing of arguments ***/
static void
usage(void)
{
fprintf(stderr, "Usage: birdc [-s <control-socket>] [-v]\n");
exit(1);
}
static void
parse_args(int argc, char **argv)
{
int c;
while ((c = getopt(argc, argv, opt_list)) >= 0)
switch (c)
{
case 's':
server_path = optarg;
break;
case 'v':
verbose++;
break;
default:
usage();
}
if (optind < argc)
usage();
}
/*** Input ***/
static void server_send(char *);
/* HACK: libreadline internals we need to access */
extern int _rl_vis_botlin;
extern void _rl_move_vert(int);
extern Function *rl_last_func;
static int
handle_internal_command(char *cmd)
{
if (!strncmp(cmd, "exit", 4) || !strncmp(cmd, "quit", 4))
{
cleanup();
exit(0);
}
if (!strncmp(cmd, "help", 4))
{
puts("Press `?' for context sensitive help.");
return 1;
}
return 0;
}
void
submit_server_command(char *cmd)
{
server_send(cmd);
nstate = STATE_CMD_SERVER;
num_lines = 2;
}
static void
got_line(char *cmd_buffer)
{
char *cmd;
if (!cmd_buffer)
{
cleanup();
exit(0);
}
if (cmd_buffer[0])
{
cmd = cmd_expand(cmd_buffer);
if (cmd)
{
add_history(cmd);
if (!handle_internal_command(cmd))
submit_server_command(cmd);
free(cmd);
}
else
add_history(cmd_buffer);
}
free(cmd_buffer);
}
void
input_start_list(void) /* Leave the currently edited line and make space for listing */
{
_rl_move_vert(_rl_vis_botlin);
#ifdef HAVE_RL_CRLF
rl_crlf();
#endif
}
void
input_stop_list(void) /* Reprint the currently edited line after listing */
{
rl_on_new_line();
rl_redisplay();
}
static int
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input_complete(int arg UNUSED, int key UNUSED)
{
static int complete_flag;
char buf[256];
if (rl_last_func != input_complete)
complete_flag = 0;
switch (cmd_complete(rl_line_buffer, rl_point, buf, complete_flag))
{
case 0:
complete_flag = 1;
break;
case 1:
rl_insert_text(buf);
break;
default:
complete_flag = 1;
#ifdef HAVE_RL_DING
rl_ding();
#endif
}
return 0;
}
static int
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input_help(int arg, int key UNUSED)
{
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int i, in_string, in_bracket;
if (arg != 1)
return rl_insert(arg, '?');
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in_string = in_bracket = 0;
for (i = 0; i < rl_point; i++)
{
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if (rl_line_buffer[i] == '"')
in_string = ! in_string;
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else if (! in_string)
{
if (rl_line_buffer[i] == '[')
in_bracket++;
else if (rl_line_buffer[i] == ']')
in_bracket--;
}
}
/* `?' inside string or path -> insert */
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if (in_string || in_bracket)
return rl_insert(1, '?');
rl_begin_undo_group(); /* HACK: We want to display `?' at point position */
rl_insert_text("?");
rl_redisplay();
rl_end_undo_group();
input_start_list();
cmd_help(rl_line_buffer, rl_point);
rl_undo_command(1, 0);
input_stop_list();
return 0;
}
static void
input_init(void)
{
rl_readline_name = "birdc";
rl_add_defun("bird-complete", input_complete, '\t');
rl_add_defun("bird-help", input_help, '?');
rl_callback_handler_install("bird> ", got_line);
input_initialized = 1;
// readline library does strange things when stdin is nonblocking.
// if (fcntl(0, F_SETFL, O_NONBLOCK) < 0)
// die("fcntl: %m");
}
static void
input_hide(void)
{
input_hidden_end = rl_end;
rl_end = 0;
rl_expand_prompt("");
rl_redisplay();
}
static void
input_reveal(void)
{
/* need this, otherwise some lib seems to eat pending output when
the prompt is displayed */
fflush(stdout);
tcdrain(fileno(stdout));
rl_end = input_hidden_end;
rl_expand_prompt("bird> ");
rl_forced_update_display();
}
void
cleanup(void)
{
if (input_initialized)
{
input_initialized = 0;
input_hide();
rl_callback_handler_remove();
}
}
void
update_state(void)
{
if (nstate == cstate)
return;
if (nstate == STATE_PROMPT)
if (input_initialized)
input_reveal();
else
input_init();
if (nstate != STATE_PROMPT)
input_hide();
cstate = nstate;
}
void
more(void)
{
printf("--More--\015");
fflush(stdout);
redo:
switch (getchar())
{
case 32:
num_lines = 2;
break;
case 13:
num_lines--;
break;
case 'q':
skip_input = 1;
break;
default:
goto redo;
}
printf(" \015");
fflush(stdout);
}
/*** Communication with server ***/
static void
server_connect(void)
{
struct sockaddr_un sa;
server_fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (server_fd < 0)
die("Cannot create socket: %m");
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if (strlen(server_path) >= sizeof(sa.sun_path))
die("server_connect: path too long");
bzero(&sa, sizeof(sa));
sa.sun_family = AF_UNIX;
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strcpy(sa.sun_path, server_path);
if (connect(server_fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) < 0)
die("Unable to connect to server control socket (%s): %m", server_path);
if (fcntl(server_fd, F_SETFL, O_NONBLOCK) < 0)
die("fcntl: %m");
}
static void
server_got_reply(char *x)
{
int code;
if (*x == '+') /* Async reply */
skip_input || printf(">>> %s\n", x+1);
else if (x[0] == ' ') /* Continuation */
skip_input || printf("%s%s\n", verbose ? " " : "", x+1);
else if (strlen(x) > 4 &&
sscanf(x, "%d", &code) == 1 && code >= 0 && code < 10000 &&
(x[4] == ' ' || x[4] == '-'))
{
if (code)
skip_input || printf("%s\n", verbose ? x : x+5);
if (x[4] == ' ')
{
nstate = STATE_PROMPT;
skip_input = 0;
return;
}
}
else
skip_input || printf("??? <%s>\n", x);
if (skip_input)
return;
num_lines++;
if (interactive && input_initialized && (num_lines >= LINES) && (cstate == STATE_CMD_SERVER))
more();
}
static void
server_read(void)
{
int c;
byte *start, *p;
redo:
c = read(server_fd, server_read_pos, server_read_buf + sizeof(server_read_buf) - server_read_pos);
if (!c)
die("Connection closed by server.");
if (c < 0)
{
if (errno == EINTR)
goto redo;
else
die("Server read error: %m");
}
start = server_read_buf;
p = server_read_pos;
server_read_pos += c;
while (p < server_read_pos)
if (*p++ == '\n')
{
p[-1] = 0;
server_got_reply(start);
start = p;
}
if (start != server_read_buf)
{
int l = server_read_pos - start;
memmove(server_read_buf, start, l);
server_read_pos = server_read_buf + l;
}
else if (server_read_pos == server_read_buf + sizeof(server_read_buf))
{
strcpy(server_read_buf, "?<too-long>");
server_read_pos = server_read_buf + 11;
}
}
static fd_set select_fds;
static void
select_loop(void)
{
int rv;
while (1)
{
FD_ZERO(&select_fds);
if (cstate != STATE_CMD_USER)
FD_SET(server_fd, &select_fds);
if (cstate != STATE_CMD_SERVER)
FD_SET(0, &select_fds);
rv = select(server_fd+1, &select_fds, NULL, NULL, NULL);
if (rv < 0)
{
if (errno == EINTR)
continue;
else
die("select: %m");
}
if (FD_ISSET(server_fd, &select_fds))
{
server_read();
update_state();
}
if (FD_ISSET(0, &select_fds))
{
rl_callback_read_char();
update_state();
}
}
}
static void
wait_for_write(int fd)
{
while (1)
{
int rv;
fd_set set;
FD_ZERO(&set);
FD_SET(fd, &set);
rv = select(fd+1, NULL, &set, NULL, NULL);
if (rv < 0)
{
if (errno == EINTR)
continue;
else
die("select: %m");
}
if (FD_ISSET(server_fd, &set))
return;
}
}
static void
server_send(char *cmd)
{
int l = strlen(cmd);
byte *z = alloca(l + 1);
memcpy(z, cmd, l);
z[l++] = '\n';
while (l)
{
int cnt = write(server_fd, z, l);
if (cnt < 0)
{
if (errno == EAGAIN)
wait_for_write(server_fd);
else if (errno == EINTR)
continue;
else
die("Server write error: %m");
}
else
{
l -= cnt;
z += cnt;
}
}
}
int
main(int argc, char **argv)
{
#ifdef HAVE_LIBDMALLOC
if (!getenv("DMALLOC_OPTIONS"))
dmalloc_debug(0x2f03d00);
#endif
interactive = isatty(0);
parse_args(argc, argv);
cmd_build_tree();
server_connect();
select_loop();
return 0;
}