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bird/client/client.c
Ondrej Zajicek (work) 9b0b2c0d41 Client: Use exit status to report errors 
When birdc is called with a command as an argument, it should set exit
status to non-zero when BIRD replied with an error reply code.

Thanks to Vincent Bernat and others for suggestion.
2022-03-11 03:52:50 +01:00

452 lines
8.1 KiB
C
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/*
* BIRD Client
*
* (c) 1999--2004 Martin Mares <mj@ucw.cz>
* (c) 2013 Tomas Hlavacek <tmshlvck@gmail.com>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/**
* DOC: BIRD client
*
* There are two variants of BIRD client: regular and light. regular
* variant depends on readline and ncurses libraries, while light
* variant uses just libc. Most of the code and the main() is common
* for both variants (in client.c file) and just a few functions are
* different (in birdc.c for regular and birdcl.c for light). Two
* binaries are generated by linking common object files like client.o
* (which is compiled from client.c just once) with either birdc.o or
* birdcl.o for each variant.
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include "nest/bird.h"
#include "lib/resource.h"
#include "lib/string.h"
#include "client/client.h"
#include "sysdep/unix/unix.h"
#define SERVER_READ_BUF_LEN 4096
static char *opt_list = "s:vrl";
static int verbose, restricted, once;
static char *init_cmd;
static char *server_path = PATH_CONTROL_SOCKET;
static int server_fd;
static byte server_read_buf[SERVER_READ_BUF_LEN];
static byte *server_read_pos = server_read_buf;
int init = 1; /* During intial sequence */
int busy = 1; /* Executing BIRD command */
int interactive; /* Whether stdin is terminal */
int last_code; /* Last return code */
static int num_lines, skip_input;
int term_lns, term_cls;
/*** Parsing of arguments ***/
static void
usage(char *name)
{
fprintf(stderr, "Usage: %s [-s <control-socket>] [-v] [-r] [-l]\n", name);
exit(1);
}
static void
parse_args(int argc, char **argv)
{
int server_changed = 0;
int c;
while ((c = getopt(argc, argv, opt_list)) >= 0)
switch (c)
{
case 's':
server_path = optarg;
server_changed = 1;
break;
case 'v':
verbose++;
break;
case 'r':
restricted = 1;
break;
case 'l':
if (!server_changed)
server_path = xbasename(server_path);
break;
default:
usage(argv[0]);
}
/* If some arguments are not options, we take it as commands */
if (optind < argc)
{
char *tmp;
int i;
int len = 0;
for (i = optind; i < argc; i++)
len += strlen(argv[i]) + 1;
tmp = init_cmd = malloc(len);
for (i = optind; i < argc; i++)
{
strcpy(tmp, argv[i]);
tmp += strlen(tmp);
*tmp++ = ' ';
}
tmp[-1] = 0;
once = 1;
interactive = 0;
}
}
/*** Input ***/
static void server_send(char *cmd);
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;
}
static void
submit_server_command(char *cmd)
{
busy = 1;
num_lines = 2;
server_send(cmd);
}
static inline void
submit_init_command(char *cmd_raw)
{
char *cmd = cmd_expand(cmd_raw);
if (!cmd)
{
cleanup();
exit(0);
}
submit_server_command(cmd);
free(cmd);
}
void
submit_command(char *cmd_raw)
{
char *cmd = cmd_expand(cmd_raw);
if (!cmd)
return;
if (!handle_internal_command(cmd))
submit_server_command(cmd);
free(cmd);
}
static void
init_commands(void)
{
if (restricted)
{
submit_server_command("restrict");
restricted = 0;
return;
}
if (init_cmd)
{
/* First transition - client received hello from BIRD
and there is waiting initial command */
submit_init_command(init_cmd);
init_cmd = NULL;
return;
}
if (once)
{
/* Initial command is finished and we want to exit */
cleanup();
exit((last_code < 8000) ? 0 : 1);
}
input_init();
term_lns = (term_lns > 0) ? term_lns : 25;
term_cls = (term_cls > 0) ? term_cls : 80;
init = 0;
}
/*** Output ***/
void
more(void)
{
more_begin();
printf("--More--\015");
fflush(stdout);
redo:
switch (getchar())
{
case ' ':
num_lines = 2;
break;
case '\n':
case '\r':
num_lines--;
break;
case 'q':
skip_input = 1;
break;
default:
goto redo;
}
printf(" \015");
fflush(stdout);
more_end();
}
/*** 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");
if (strlen(server_path) >= sizeof(sa.sun_path))
die("server_connect: path too long");
bzero(&sa, sizeof(sa));
sa.sun_family = AF_UNIX;
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)", server_path);
if (fcntl(server_fd, F_SETFL, O_NONBLOCK) < 0)
DIE("fcntl");
}
#define PRINTF(LEN, PARGS...) do { if (!skip_input) len = printf(PARGS); } while(0)
static void
server_got_reply(char *x)
{
int code;
int len = 0;
if (*x == '+') /* Async reply */
PRINTF(len, ">>> %s\n", x+1);
else if (x[0] == ' ') /* Continuation */
PRINTF(len, "%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)
PRINTF(len, "%s\n", verbose ? x : x+5);
last_code = code;
if (x[4] == ' ')
{
busy = 0;
skip_input = 0;
return;
}
}
else
PRINTF(len, "??? <%s>\n", x);
if (interactive && busy && !skip_input && !init && (len > 0))
{
num_lines += (len + term_cls - 1) / term_cls; /* Divide and round up */
if (num_lines >= term_lns)
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");
}
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 void
select_loop(void)
{
int rv;
while (1)
{
if (init && !busy)
init_commands();
if (!init)
input_notify(!busy);
fd_set select_fds;
FD_ZERO(&select_fds);
FD_SET(server_fd, &select_fds);
if (!busy)
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");
}
if (FD_ISSET(0, &select_fds))
{
input_read();
continue;
}
if (FD_ISSET(server_fd, &select_fds))
{
server_read();
continue;
}
}
}
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");
}
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");
}
else
{
l -= cnt;
z += cnt;
}
}
}
int
main(int argc, char **argv)
{
interactive = isatty(0);
parse_args(argc, argv);
cmd_build_tree();
server_connect();
select_loop();
return 0;
}
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