hush/networking/slattach.c
Denis Vlasenko fb79a2e2cf xioctl and friends by Tito <farmatito@tiscali.it>
function                                             old     new   delta
do_iptunnel                                          203     977    +774
process_dev                                         5328    5494    +166
ioctl_or_perror                                        -      54     +54
ioctl_or_perror_and_die                                -      51     +51
ioctl_alt_func                                         -      49     +49
bb_ioctl_or_warn                                       -      47     +47
do_add_ioctl                                         102     145     +43
bb_xioctl                                              -      39     +39
print_value_on_off                                     -      31     +31
get_lcm                                              105     123     +18
arp_main                                            2155    2167     +12
..................
zcip_main                                           1576    1566     -10
setlogcons_main                                       92      82     -10
dumpkmap_main                                        263     253     -10
do_get_ioctl                                          85      75     -10
setkeycodes_main                                     165     154     -11
write_table                                          244     232     -12
vconfig_main                                         318     306     -12
do_del_ioctl                                          93      81     -12
set_address                                           75      62     -13
maybe_set_utc                                         30      16     -14
loadfont_main                                        495     479     -16
slattach_main                                        712     695     -17
do_loadfont                                          191     174     -17
do_iplink                                           1155    1136     -19
getty_main                                          2583    2562     -21
fbset_main                                          2058    2035     -23
do_time                                              588     565     -23
xioctl                                                25       -     -25
read_rtc                                             186     160     -26
parse_conf                                          1299    1270     -29
udhcp_read_interface                                 269     239     -30
bb_ioctl                                              45       -     -45
bb_ioctl_alt                                          70       -     -70
bb_ioctl_on_off                                       78       -     -78
.rodata                                           129370  129018    -352
do_show                                              799       -    -799
------------------------------------------------------------------------------
(add/remove: 6/5 grow/shrink: 13/49 up/down: 1316/-1864)     Total: -548 bytes
   text	   data	    bss	    dec	    hex	filename
 675352	   2740	  13968	 692060	  a8f5c	busybox_old
 674804	   2740	  13968	 691512	  a8d38	busybox_unstripped
2007-07-14 22:07:14 +00:00

243 lines
5.3 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Stripped down version of net-tools for busybox.
*
* Author: Ignacio Garcia Perez (iggarpe at gmail dot com)
*
* License: GPLv2 or later, see LICENSE file in this tarball.
*
* There are some differences from the standard net-tools slattach:
*
* - The -l option is not supported.
*
* - The -F options allows disabling of RTS/CTS flow control.
*/
#include "libbb.h"
#include "libiproute/utils.h" /* invarg() */
/* Line discipline code table */
static const char *const proto_names[] = {
"cslip"+1, /* 0 */
"cslip", /* 1 */
"cslip6"+1, /* 2 */
"cslip6", /* 3 */
"adaptive", /* 8 */
NULL
};
struct globals {
int handle;
int saved_disc;
struct termios saved_state;
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define handle (G.handle )
#define saved_disc (G.saved_disc )
#define saved_state (G.saved_state )
#define INIT_G() do {} while (0)
/*
* Save tty state and line discipline
*
* It is fine here to bail out on errors, since we haven modified anything yet
*/
static void save_state(void)
{
/* Save line status */
if (tcgetattr(handle, &saved_state) < 0)
bb_perror_msg_and_die("get state");
/* Save line discipline */
xioctl(handle, TIOCGETD, &saved_disc);
}
static int set_termios_state_and_warn(struct termios *state)
{
int ret;
ret = tcsetattr(handle, TCSANOW, state);
if (ret < 0) {
bb_perror_msg("set state");
return 1; /* used as exitcode */
}
return 0;
}
/*
* Restore state and line discipline for ALL managed ttys
*
* Restoring ALL managed ttys is the only way to have a single
* hangup delay.
*
* Go on after errors: we want to restore as many controlled ttys
* as possible.
*/
static void restore_state_and_exit(int exitcode) ATTRIBUTE_NORETURN;
static void restore_state_and_exit(int exitcode)
{
struct termios state;
/* Restore line discipline */
if (ioctl_or_warn(handle, TIOCSETD, &saved_disc) < 0) {
exitcode = 1;
}
/* Hangup */
memcpy(&state, &saved_state, sizeof(state));
cfsetispeed(&state, B0);
cfsetospeed(&state, B0);
if (set_termios_state_and_warn(&state))
exitcode = 1;
sleep(1);
/* Restore line status */
if (set_termios_state_and_warn(&saved_state))
exit(EXIT_FAILURE);
if (ENABLE_FEATURE_CLEAN_UP)
close(handle);
exit(exitcode);
}
/*
* Set tty state, line discipline and encapsulation
*/
static void set_state(struct termios *state, int encap)
{
int disc;
/* Set line status */
if (set_termios_state_and_warn(state))
goto bad;
/* Set line discliple (N_SLIP always) */
disc = N_SLIP;
if (ioctl_or_warn(handle, TIOCSETD, &disc) < 0) {
goto bad;
}
/* Set encapsulation (SLIP, CSLIP, etc) */
if (ioctl_or_warn(handle, SIOCSIFENCAP, &encap) < 0) {
bad:
restore_state_and_exit(1);
}
}
static void sig_handler(int signo)
{
restore_state_and_exit(0);
}
int slattach_main(int argc, char **argv);
int slattach_main(int argc, char **argv)
{
int i, encap, opt;
struct termios state;
const char *proto = "cslip";
const char *extcmd; /* Command to execute after hangup */
const char *baud_str;
int baud_code = -1; /* Line baud rate (system code) */
enum {
OPT_p_proto = 1 << 0,
OPT_s_baud = 1 << 1,
OPT_c_extcmd = 1 << 2,
OPT_e_quit = 1 << 3,
OPT_h_watch = 1 << 4,
OPT_m_nonraw = 1 << 5,
OPT_L_local = 1 << 6,
OPT_F_noflow = 1 << 7
};
INIT_G();
/* Parse command line options */
opt = getopt32(argc, argv, "p:s:c:ehmLF", &proto, &baud_str, &extcmd);
/*argc -= optind;*/
argv += optind;
if (!*argv)
bb_show_usage();
encap = index_in_str_array(proto_names, proto);
if (encap < 0)
invarg(proto, "protocol");
if (encap > 3)
encap = 8;
/* We want to know if the baud rate is valid before we start touching the ttys */
if (opt & OPT_s_baud) {
baud_code = tty_value_to_baud(xatoi(baud_str));
if (baud_code < 0)
invarg(baud_str, "baud rate");
}
/* Trap signals in order to restore tty states upon exit */
if (!(opt & OPT_e_quit)) {
signal(SIGHUP, sig_handler);
signal(SIGINT, sig_handler);
signal(SIGQUIT, sig_handler);
signal(SIGTERM, sig_handler);
}
/* Open tty */
handle = open(*argv, O_RDWR | O_NDELAY);
if (handle < 0) {
char *buf = concat_path_file("/dev", *argv);
handle = xopen(buf, O_RDWR | O_NDELAY);
/* maybe if (ENABLE_FEATURE_CLEAN_UP) ?? */
free(buf);
}
/* Save current tty state */
save_state();
/* Configure tty */
memcpy(&state, &saved_state, sizeof(state));
if (!(opt & OPT_m_nonraw)) { /* raw not suppressed */
memset(&state.c_cc, 0, sizeof(state.c_cc));
state.c_cc[VMIN] = 1;
state.c_iflag = IGNBRK | IGNPAR;
state.c_oflag = 0;
state.c_lflag = 0;
state.c_cflag = CS8 | HUPCL | CREAD
| ((opt & OPT_L_local) ? CLOCAL : 0)
| ((opt & OPT_F_noflow) ? 0 : CRTSCTS);
}
if (opt & OPT_s_baud) {
cfsetispeed(&state, baud_code);
cfsetospeed(&state, baud_code);
}
set_state(&state, encap);
/* Exit now if option -e was passed */
if (opt & OPT_e_quit)
return 0;
/* If we're not requested to watch, just keep descriptor open
* until we are killed */
if (!(opt & OPT_h_watch))
while (1)
sleep(24*60*60);
/* Watch line for hangup */
while (1) {
if (ioctl(handle, TIOCMGET, &i) < 0 || !(i & TIOCM_CAR))
goto no_carrier;
sleep(15);
}
no_carrier:
/* Execute command on hangup */
if (opt & OPT_c_extcmd)
system(extcmd);
/* Restore states and exit */
restore_state_and_exit(0);
}