mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-11-18 17:18:42 +00:00
512 lines
9.0 KiB
C
512 lines
9.0 KiB
C
/*
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* BIRD Client
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*
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* (c) 1999--2004 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <termios.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/types.h>
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#include <readline/readline.h>
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#include <readline/history.h>
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#include <curses.h>
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#include "nest/bird.h"
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#include "lib/resource.h"
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#include "lib/string.h"
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#include "client/client.h"
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#include "sysdep/unix/unix.h"
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static char *opt_list = "s:v";
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static int verbose;
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static char *server_path = PATH_CONTROL_SOCKET;
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static int server_fd;
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static byte server_read_buf[4096];
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static byte *server_read_pos = server_read_buf;
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#define STATE_PROMPT 0
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#define STATE_CMD_SERVER 1
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#define STATE_CMD_USER 2
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static int input_initialized;
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static int input_hidden_end;
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static int cstate = STATE_CMD_SERVER;
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static int nstate = STATE_CMD_SERVER;
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static int num_lines, skip_input, interactive;
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/*** Parsing of arguments ***/
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static void
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usage(void)
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{
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fprintf(stderr, "Usage: birdc [-s <control-socket>] [-v]\n");
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exit(1);
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}
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static void
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parse_args(int argc, char **argv)
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{
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int c;
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while ((c = getopt(argc, argv, opt_list)) >= 0)
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switch (c)
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{
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case 's':
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server_path = optarg;
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break;
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case 'v':
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verbose++;
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break;
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default:
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usage();
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}
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if (optind < argc)
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usage();
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}
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/*** Input ***/
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static void server_send(char *);
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/* HACK: libreadline internals we need to access */
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extern int _rl_vis_botlin;
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extern void _rl_move_vert(int);
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extern Function *rl_last_func;
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static int
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handle_internal_command(char *cmd)
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{
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if (!strncmp(cmd, "exit", 4) || !strncmp(cmd, "quit", 4))
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{
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cleanup();
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exit(0);
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}
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if (!strncmp(cmd, "help", 4))
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{
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puts("Press `?' for context sensitive help.");
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return 1;
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}
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return 0;
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}
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void
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submit_server_command(char *cmd)
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{
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server_send(cmd);
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nstate = STATE_CMD_SERVER;
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num_lines = 2;
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}
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static void
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got_line(char *cmd_buffer)
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{
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char *cmd;
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if (!cmd_buffer)
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{
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cleanup();
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exit(0);
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}
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if (cmd_buffer[0])
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{
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cmd = cmd_expand(cmd_buffer);
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if (cmd)
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{
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add_history(cmd);
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if (!handle_internal_command(cmd))
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submit_server_command(cmd);
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free(cmd);
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}
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else
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add_history(cmd_buffer);
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}
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free(cmd_buffer);
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}
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void
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input_start_list(void) /* Leave the currently edited line and make space for listing */
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{
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_rl_move_vert(_rl_vis_botlin);
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#ifdef HAVE_RL_CRLF
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rl_crlf();
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#endif
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}
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void
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input_stop_list(void) /* Reprint the currently edited line after listing */
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{
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rl_on_new_line();
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rl_redisplay();
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}
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static int
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input_complete(int arg UNUSED, int key UNUSED)
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{
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static int complete_flag;
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char buf[256];
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if (rl_last_func != input_complete)
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complete_flag = 0;
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switch (cmd_complete(rl_line_buffer, rl_point, buf, complete_flag))
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{
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case 0:
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complete_flag = 1;
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break;
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case 1:
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rl_insert_text(buf);
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break;
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default:
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complete_flag = 1;
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#ifdef HAVE_RL_DING
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rl_ding();
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#endif
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}
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return 0;
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}
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static int
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input_help(int arg, int key UNUSED)
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{
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int i, in_string, in_bracket;
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if (arg != 1)
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return rl_insert(arg, '?');
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in_string = in_bracket = 0;
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for (i = 0; i < rl_point; i++)
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{
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if (rl_line_buffer[i] == '"')
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in_string = ! in_string;
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else if (! in_string)
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{
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if (rl_line_buffer[i] == '[')
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in_bracket++;
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else if (rl_line_buffer[i] == ']')
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in_bracket--;
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}
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}
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/* `?' inside string or path -> insert */
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if (in_string || in_bracket)
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return rl_insert(1, '?');
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rl_begin_undo_group(); /* HACK: We want to display `?' at point position */
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rl_insert_text("?");
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rl_redisplay();
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rl_end_undo_group();
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input_start_list();
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cmd_help(rl_line_buffer, rl_point);
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rl_undo_command(1, 0);
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input_stop_list();
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return 0;
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}
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static void
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input_init(void)
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{
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rl_readline_name = "birdc";
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rl_add_defun("bird-complete", input_complete, '\t');
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rl_add_defun("bird-help", input_help, '?');
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rl_callback_handler_install("bird> ", got_line);
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input_initialized = 1;
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// readline library does strange things when stdin is nonblocking.
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// if (fcntl(0, F_SETFL, O_NONBLOCK) < 0)
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// die("fcntl: %m");
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}
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static void
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input_hide(void)
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{
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input_hidden_end = rl_end;
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rl_end = 0;
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rl_expand_prompt("");
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rl_redisplay();
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}
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static void
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input_reveal(void)
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{
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/* need this, otherwise some lib seems to eat pending output when
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the prompt is displayed */
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fflush(stdout);
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tcdrain(fileno(stdout));
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rl_end = input_hidden_end;
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rl_expand_prompt("bird> ");
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rl_forced_update_display();
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}
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void
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cleanup(void)
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{
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if (input_initialized)
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{
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input_initialized = 0;
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input_hide();
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rl_callback_handler_remove();
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}
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}
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void
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update_state(void)
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{
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if (nstate == cstate)
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return;
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if (nstate == STATE_PROMPT)
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if (input_initialized)
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input_reveal();
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else
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input_init();
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if (nstate != STATE_PROMPT)
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input_hide();
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cstate = nstate;
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}
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void
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more(void)
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{
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printf("--More--\015");
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fflush(stdout);
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redo:
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switch (getchar())
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{
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case 32:
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num_lines = 2;
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break;
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case 13:
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num_lines--;
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break;
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case 'q':
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skip_input = 1;
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break;
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default:
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goto redo;
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}
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printf(" \015");
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fflush(stdout);
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}
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/*** Communication with server ***/
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static void
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server_connect(void)
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{
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struct sockaddr_un sa;
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server_fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (server_fd < 0)
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die("Cannot create socket: %m");
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if (strlen(server_path) >= sizeof(sa.sun_path))
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die("server_connect: path too long");
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bzero(&sa, sizeof(sa));
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sa.sun_family = AF_UNIX;
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strcpy(sa.sun_path, server_path);
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if (connect(server_fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) < 0)
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die("Unable to connect to server control socket (%s): %m", server_path);
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if (fcntl(server_fd, F_SETFL, O_NONBLOCK) < 0)
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die("fcntl: %m");
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}
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static void
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server_got_reply(char *x)
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{
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int code;
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if (*x == '+') /* Async reply */
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skip_input || printf(">>> %s\n", x+1);
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else if (x[0] == ' ') /* Continuation */
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skip_input || printf("%s%s\n", verbose ? " " : "", x+1);
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else if (strlen(x) > 4 &&
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sscanf(x, "%d", &code) == 1 && code >= 0 && code < 10000 &&
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(x[4] == ' ' || x[4] == '-'))
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{
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if (code)
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skip_input || printf("%s\n", verbose ? x : x+5);
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if (x[4] == ' ')
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{
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nstate = STATE_PROMPT;
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skip_input = 0;
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return;
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}
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}
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else
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skip_input || printf("??? <%s>\n", x);
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if (skip_input)
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return;
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num_lines++;
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if (interactive && input_initialized && (num_lines >= LINES) && (cstate == STATE_CMD_SERVER))
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more();
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}
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static void
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server_read(void)
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{
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int c;
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byte *start, *p;
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redo:
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c = read(server_fd, server_read_pos, server_read_buf + sizeof(server_read_buf) - server_read_pos);
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if (!c)
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die("Connection closed by server.");
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if (c < 0)
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{
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if (errno == EINTR)
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goto redo;
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else
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die("Server read error: %m");
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}
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start = server_read_buf;
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p = server_read_pos;
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server_read_pos += c;
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while (p < server_read_pos)
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if (*p++ == '\n')
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{
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p[-1] = 0;
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server_got_reply(start);
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start = p;
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}
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if (start != server_read_buf)
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{
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int l = server_read_pos - start;
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memmove(server_read_buf, start, l);
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server_read_pos = server_read_buf + l;
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}
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else if (server_read_pos == server_read_buf + sizeof(server_read_buf))
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{
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strcpy(server_read_buf, "?<too-long>");
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server_read_pos = server_read_buf + 11;
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}
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}
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static fd_set select_fds;
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static void
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select_loop(void)
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{
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int rv;
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while (1)
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{
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FD_ZERO(&select_fds);
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if (cstate != STATE_CMD_USER)
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FD_SET(server_fd, &select_fds);
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if (cstate != STATE_CMD_SERVER)
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FD_SET(0, &select_fds);
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rv = select(server_fd+1, &select_fds, NULL, NULL, NULL);
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if (rv < 0)
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{
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if (errno == EINTR)
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continue;
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else
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die("select: %m");
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}
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if (FD_ISSET(server_fd, &select_fds))
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{
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server_read();
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update_state();
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}
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if (FD_ISSET(0, &select_fds))
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{
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rl_callback_read_char();
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update_state();
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}
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}
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}
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static void
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wait_for_write(int fd)
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{
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while (1)
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{
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int rv;
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fd_set set;
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FD_ZERO(&set);
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FD_SET(fd, &set);
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rv = select(fd+1, NULL, &set, NULL, NULL);
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if (rv < 0)
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{
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if (errno == EINTR)
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continue;
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else
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die("select: %m");
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}
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if (FD_ISSET(server_fd, &set))
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return;
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}
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}
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static void
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server_send(char *cmd)
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{
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int l = strlen(cmd);
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byte *z = alloca(l + 1);
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memcpy(z, cmd, l);
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z[l++] = '\n';
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while (l)
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{
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int cnt = write(server_fd, z, l);
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if (cnt < 0)
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{
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if (errno == EAGAIN)
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wait_for_write(server_fd);
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else if (errno == EINTR)
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continue;
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else
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die("Server write error: %m");
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}
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else
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{
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l -= cnt;
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z += cnt;
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}
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}
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}
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int
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main(int argc, char **argv)
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{
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#ifdef HAVE_LIBDMALLOC
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if (!getenv("DMALLOC_OPTIONS"))
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dmalloc_debug(0x2f03d00);
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#endif
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interactive = isatty(0);
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parse_args(argc, argv);
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cmd_build_tree();
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server_connect();
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select_loop();
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return 0;
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}
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