busybox/networking/slattach.c

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/* vi: set sw=4 ts=4: */
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/*
* Stripped down version of net-tools for busybox.
*
* Author: Ignacio Garcia Perez (iggarpe at gmail dot com)
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*
* 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.
*/
//config:config SLATTACH
//config: bool "slattach (6.2 kb)"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: slattach configures serial line as SLIP network interface.
//applet:IF_SLATTACH(APPLET(slattach, BB_DIR_SBIN, BB_SUID_DROP))
/* shouldn't be NOEXEC: may sleep indefinitely */
//kbuild:lib-$(CONFIG_SLATTACH) += slattach.o
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//usage:#define slattach_trivial_usage
//usage: "[-ehmLF] [-c SCRIPT] [-s BAUD] [-p PROTOCOL] SERIAL_DEVICE"
//usage:#define slattach_full_usage "\n\n"
//usage: "Configure serial line as SLIP network interface\n"
//usage: "\n -p PROT Protocol: slip, cslip (default), slip6, clisp6, adaptive"
//usage: "\n -s BAUD Line speed"
//usage: "\n -e Exit after initialization"
//usage: "\n -h Exit if carrier is lost (else never exits)"
//usage: "\n -c PROG Run PROG on carrier loss"
//usage: "\n -m Do NOT set raw 8bit mode"
//usage: "\n -L Enable 3-wire operation"
//usage: "\n -F Disable RTS/CTS flow control"
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#include "libbb.h"
#include "common_bufsiz.h"
#include "libiproute/utils.h" /* invarg_1_to_2() */
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struct globals {
int saved_disc;
struct termios saved_state;
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { setup_common_bufsiz(); } while (0)
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#define serial_fd 3
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static int tcsetattr_serial_or_warn(struct termios *state)
{
int ret;
ret = tcsetattr(serial_fd, TCSANOW, state);
if (ret != 0) {
bb_perror_msg("tcsetattr");
return 1; /* used as exitcode */
}
return ret; /* 0 */
}
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static void restore_state_and_exit(int exitcode) NORETURN;
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static void restore_state_and_exit(int exitcode)
{
struct termios state;
/* Restore line discipline */
if (ioctl_or_warn(serial_fd, TIOCSETD, &G.saved_disc)) {
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exitcode = 1;
}
/* Hangup */
memcpy(&state, &G.saved_state, sizeof(state));
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cfsetispeed(&state, B0);
cfsetospeed(&state, B0);
exitcode |= tcsetattr_serial_or_warn(&state);
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sleep(1);
/* Restore line status */
if (tcsetattr_serial_or_warn(&G.saved_state))
exit(EXIT_FAILURE);
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if (ENABLE_FEATURE_CLEAN_UP)
close(serial_fd);
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exit(exitcode);
}
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static void sig_handler(int signo UNUSED_PARAM)
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{
restore_state_and_exit(EXIT_SUCCESS);
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}
int slattach_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int slattach_main(int argc UNUSED_PARAM, char **argv)
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{
/* Line discipline code table */
static const char proto_names[] ALIGN1 =
"slip\0" /* 0 */
"cslip\0" /* 1 */
"slip6\0" /* 2 */
"cslip6\0" /* 3 */
"adaptive\0" /* 8 */
;
static const int int_N_SLIP = N_SLIP;
int encap, opt, fd;
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struct termios state;
const char *proto = "cslip";
const char *extcmd; /* Command to execute after hangup */
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const char *baud_str;
int baud_code = baud_code; /* for compiler */
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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
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};
INIT_G();
/* Parse command line options */
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
opt = getopt32(argv, "^" "p:s:c:ehmLF" "\0" "=1",
&proto, &baud_str, &extcmd
);
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/*argc -= optind;*/
argv += optind;
encap = index_in_strings(proto_names, proto);
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if (encap < 0)
invarg_1_to_2(proto, "protocol");
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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_1_to_2(baud_str, "baud rate");
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}
/* Open tty */
fd = open(*argv, O_RDWR | O_NDELAY);
if (fd < 0) {
char *buf = concat_path_file("/dev", *argv);
fd = xopen(buf, O_RDWR | O_NDELAY);
/* maybe if (ENABLE_FEATURE_CLEAN_UP) ?? */
free(buf);
}
xmove_fd(fd, serial_fd);
/* Save current tty state */
if (tcgetattr(serial_fd, &G.saved_state) != 0)
bb_perror_msg_and_die("tcgetattr");
/* Save line discipline */
xioctl(serial_fd, TIOCGETD, &G.saved_disc);
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/* Trap signals in order to restore tty states upon exit */
if (!(opt & OPT_e_quit)) {
bb_signals(0
+ (1 << SIGHUP)
+ (1 << SIGINT)
+ (1 << SIGQUIT)
+ (1 << SIGTERM)
, sig_handler);
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}
/* Configure tty */
memcpy(&state, &G.saved_state, sizeof(state));
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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;*/
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state.c_cflag = CS8 | HUPCL | CREAD
| ((opt & OPT_L_local) ? CLOCAL : 0)
| ((opt & OPT_F_noflow) ? 0 : CRTSCTS);
cfsetispeed(&state, cfgetispeed(&G.saved_state));
cfsetospeed(&state, cfgetospeed(&G.saved_state));
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}
if (opt & OPT_s_baud) {
cfsetispeed(&state, baud_code);
cfsetospeed(&state, baud_code);
}
/* Set line status */
if (tcsetattr_serial_or_warn(&state))
goto bad;
/* Set line disclipline (N_SLIP always) */
if (ioctl_or_warn(serial_fd, TIOCSETD, (void*)&int_N_SLIP))
goto bad;
/* Set encapsulation (SLIP, CSLIP, etc) */
if (ioctl_or_warn(serial_fd, SIOCSIFENCAP, &encap))
goto bad;
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/* Exit now if option -e was passed */
if (opt & OPT_e_quit)
return EXIT_SUCCESS;
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/* If we're not requested to watch, just keep descriptor open
* until we are killed */
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if (!(opt & OPT_h_watch))
while (1)
sleep(24*60*60);
/* Watch line for hangup */
while (1) {
int modem_stat;
if (ioctl(serial_fd, TIOCMGET, &modem_stat))
break;
if (!(modem_stat & TIOCM_CAR))
break;
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sleep(15);
}
/* Execute command on hangup */
if (opt & OPT_c_extcmd)
system(extcmd);
/* Restore states and exit */
restore_state_and_exit(EXIT_SUCCESS);
bad:
restore_state_and_exit(EXIT_FAILURE);
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}