slattach: new applet.
This commit is contained in:
Denis Vlasenko
parent
cd0e80ce90
commit
14923db72f
@ -296,6 +296,7 @@ USE_FEATURE_SH_IS_HUSH(APPLET_NOUSAGE(sh, hush, _BB_DIR_BIN, _BB_SUID_NEVER))
|
||||
USE_FEATURE_SH_IS_LASH(APPLET_NOUSAGE(sh, lash, _BB_DIR_BIN, _BB_SUID_NEVER))
|
||||
USE_FEATURE_SH_IS_MSH(APPLET_NOUSAGE(sh, msh, _BB_DIR_BIN, _BB_SUID_NEVER))
|
||||
USE_SHA1SUM(APPLET_ODDNAME(sha1sum, md5_sha1_sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER, sha1sum))
|
||||
USE_SLATTACH(APPLET(slattach, _BB_DIR_SBIN, _BB_SUID_NEVER))
|
||||
USE_SLEEP(APPLET_NOFORK(sleep, sleep, _BB_DIR_BIN, _BB_SUID_NEVER, sleep))
|
||||
USE_SOFTLIMIT(APPLET_ODDNAME(softlimit, chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER, softlimit))
|
||||
USE_SORT(APPLET_NOEXEC(sort, sort, _BB_DIR_USR_BIN, _BB_SUID_NEVER, sort))
|
||||
|
||||
@ -2991,6 +2991,20 @@ USE_FEATURE_RUN_PARTS_FANCY("\n -l Prints names of all matching files even when
|
||||
" -s Don't output anything, status code shows success\n" \
|
||||
" -w Warn about improperly formatted SHA1 checksum lines")
|
||||
|
||||
#define slattach_trivial_usage \
|
||||
"[-cehmLF] [-s speed] [-p protocol] DEVICEs"
|
||||
#define slattach_full_usage \
|
||||
"Attach network interface(s) to serial line(s)\n" \
|
||||
"\nOptions:" \
|
||||
"\n -p Set protocol (slip, cslip, slip6, clisp6 or adaptive)" \
|
||||
"\n -s Set line speed" \
|
||||
"\n -e Exit after initializing device" \
|
||||
"\n -h Exit when the carrier is lost" \
|
||||
"\n -c Execute a command when the line is hung up" \
|
||||
"\n -m Do NOT initialize the line in raw 8 bits mode" \
|
||||
"\n -L Enable 3-wire operation" \
|
||||
"\n -F Disable RTS/CTS flow control" \
|
||||
|
||||
#define sleep_trivial_usage \
|
||||
USE_FEATURE_FANCY_SLEEP("[") "N" USE_FEATURE_FANCY_SLEEP("]...")
|
||||
#define sleep_full_usage \
|
||||
|
||||
@ -548,6 +548,12 @@ config ROUTE
|
||||
help
|
||||
Route displays or manipulates the kernel's IP routing tables.
|
||||
|
||||
config SLATTACH
|
||||
bool "slattach"
|
||||
default n
|
||||
help
|
||||
slattach is a small utility to attach network interfaces to serial lines.
|
||||
|
||||
config TELNET
|
||||
bool "telnet"
|
||||
default n
|
||||
|
||||
@ -27,6 +27,7 @@ lib-$(CONFIG_PING) += ping.o
|
||||
lib-$(CONFIG_PING6) += ping.o
|
||||
lib-$(CONFIG_PSCAN) += pscan.o
|
||||
lib-$(CONFIG_ROUTE) += route.o
|
||||
lib-$(CONFIG_SLATTACH) += slattach.o
|
||||
lib-$(CONFIG_TELNET) += telnet.o
|
||||
lib-$(CONFIG_TELNETD) += telnetd.o
|
||||
lib-$(CONFIG_TFTP) += tftp.o
|
||||
|
||||
240
networking/slattach.c
Normal file
240
networking/slattach.c
Normal file
@ -0,0 +1,240 @@
|
||||
/*
|
||||
* 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"
|
||||
|
||||
/* Line discipline code table */
|
||||
static const char *const proto_names[] = {
|
||||
"slip", /* 0 */
|
||||
"cslip", /* 1 */
|
||||
"slip6", /* 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 */
|
||||
if (ioctl(handle, TIOCGETD, &saved_disc) < 0)
|
||||
bb_perror_msg_and_die("get discipline");
|
||||
}
|
||||
|
||||
/*
|
||||
* 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(handle, TIOCSETD, &saved_disc) < 0) {
|
||||
bb_perror_msg("set discipline");
|
||||
exitcode = 1;
|
||||
}
|
||||
|
||||
/* Hangup */
|
||||
memcpy(&state, &saved_state, sizeof(state));
|
||||
cfsetispeed(&state, B0);
|
||||
cfsetospeed(&state, B0);
|
||||
if (tcsetattr(handle, TCSANOW, &state) < 0) {
|
||||
bb_perror_msg("set state");
|
||||
exitcode = 1;
|
||||
}
|
||||
|
||||
sleep(1);
|
||||
|
||||
/* Restore line status */
|
||||
if (tcsetattr(handle, TCSANOW, &saved_state) < 0) {
|
||||
bb_perror_msg_and_die("set state");
|
||||
}
|
||||
|
||||
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 (tcsetattr(handle, TCSANOW, state) < 0) {
|
||||
bb_perror_msg("set state");
|
||||
goto bad;
|
||||
}
|
||||
|
||||
/* Set line discliple (N_SLIP always) */
|
||||
disc = N_SLIP;
|
||||
if (ioctl(handle, TIOCSETD, &disc) < 0) {
|
||||
bb_perror_msg("set discipline");
|
||||
goto bad;
|
||||
}
|
||||
|
||||
/* Set encapsulation (SLIP, CSLIP, etc) */
|
||||
if (ioctl(handle, SIOCSIFENCAP, &encap) < 0) {
|
||||
bb_perror_msg("set encapsulation");
|
||||
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)
|
||||
bb_error_msg_and_die("invalid protocol %s", proto);
|
||||
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)
|
||||
bb_error_msg_and_die("invalid 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 = xasprintf("/dev/%s", *argv);
|
||||
handle = xopen(buf, O_RDWR | O_NDELAY);
|
||||
/* maybe if (ENABLE_FEATURE_CLEAN_UP) ?? */
|
||||
free(buf);
|
||||
}
|
||||
|
||||
/* Save current tty state */
|
||||
save_state();
|
||||
|
||||
/* Confgure 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
|
||||
* till 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);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user