busybox/util-linux/script.c

241 lines
6.6 KiB
C
Raw Normal View History

/* vi: set sw=4 ts=4: */
/*
* script implementation for busybox
*
* pascal.bellard@ads-lu.com
*
* Based on code from util-linux v 2.12r
* Copyright (c) 1980
* The Regents of the University of California. All rights reserved.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config SCRIPT
//config: bool "script (8 kb)"
//config: default y
//config: help
//config: The script makes typescript of terminal session.
//applet:IF_SCRIPT(APPLET(script, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_SCRIPT) += script.o
//usage:#define script_trivial_usage
//usage: "[-afq] [-t[FILE]] [-c PROG] [OUTFILE]"
//usage:#define script_full_usage "\n\n"
//usage: "Default OUTFILE is 'typescript'"
//usage: "\n"
//usage: "\n -a Append output"
//usage: "\n -c PROG Run PROG, not shell"
/* Accepted but has no effect (we never buffer output) */
/*//usage: "\n -f Flush output after each write"*/
//usage: "\n -q Quiet"
//usage: "\n -t[FILE] Send timing to stderr or FILE"
//util-linux-2.28:
//-e: return exit code of the child
//FYI (reported as bbox bug #2749):
// > script -q -c 'echo -e -n "1\n2\n3\n"' /dev/null </dev/null >123.txt
// > The output file on full-blown ubuntu system contains 6 bytes.
// > Output on Busybox system (arm-linux) contains extra '\r' byte in each line.
//however, in my test, "script" from util-linux-2.28 seems to also add '\r' bytes.
#include "libbb.h"
#include "common_bufsiz.h"
int script_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2008-07-05 14:48:54 +05:30
int script_main(int argc UNUSED_PARAM, char **argv)
{
int opt;
int mode;
int child_pid;
int attr_ok; /* NB: 0: ok */
int winsz_ok;
int pty;
char pty_line[GETPTY_BUFSIZE];
struct termios tt, rtt;
struct winsize win;
FILE *timing_fp;
const char *str_t = NULL;
const char *fname = "typescript";
const char *shell;
char shell_opt[] = "-i";
char *shell_arg = NULL;
enum {
OPT_a = (1 << 0),
OPT_c = (1 << 1),
OPT_f = (1 << 2),
OPT_q = (1 << 3),
OPT_t = (1 << 4),
};
#if ENABLE_LONG_OPTS
static const char script_longopts[] ALIGN1 =
"append\0" No_argument "a"
"command\0" Required_argument "c"
"flush\0" No_argument "f"
"quiet\0" No_argument "q"
"timing\0" Optional_argument "t"
;
#endif
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 = getopt32long(argv, "^" "ac:fqt::" "\0" "?1"/* max one arg */,
script_longopts,
&shell_arg, &str_t
);
//argc -= optind;
argv += optind;
if (argv[0]) {
fname = argv[0];
}
mode = O_CREAT|O_TRUNC|O_WRONLY;
if (opt & OPT_a) {
mode = O_CREAT|O_APPEND|O_WRONLY;
}
if (opt & OPT_c) {
shell_opt[1] = 'c';
}
if (!(opt & OPT_q)) {
printf("Script started, file is %s\n", fname);
}
timing_fp = stderr;
if (str_t) {
timing_fp = xfopen_for_write(str_t);
}
shell = get_shell_name();
/* Some people run "script ... 0>&-".
* Our code assumes that STDIN_FILENO != pty.
* Ensure STDIN_FILENO is not closed:
*/
bb_sanitize_stdio();
pty = xgetpty(pty_line);
/* get current stdin's tty params */
attr_ok = tcgetattr(0, &tt);
winsz_ok = ioctl(0, TIOCGWINSZ, (char *)&win);
rtt = tt;
cfmakeraw(&rtt);
rtt.c_lflag &= ~ECHO;
tcsetattr(0, TCSAFLUSH, &rtt);
/* "script" from util-linux exits when child exits,
* we wouldn't wait for EOF from slave pty
* (output may be produced by grandchildren of child) */
signal(SIGCHLD, record_signo);
/* TODO: SIGWINCH? pass window size changes down to slave? */
child_pid = xvfork();
if (child_pid) {
/* parent */
struct pollfd pfd[2];
int outfd, count, loop;
double oldtime = time(NULL);
smallint fd_count = 2;
#define buf bb_common_bufsiz1
setup_common_bufsiz();
outfd = xopen(fname, mode);
pfd[0].fd = pty;
pfd[0].events = POLLIN;
pfd[1].fd = STDIN_FILENO;
pfd[1].events = POLLIN;
ndelay_on(pty); /* this descriptor is not shared, can do this */
/* ndelay_on(STDIN_FILENO); - NO, stdin can be shared! Pity :( */
/* copy stdin to pty master input,
* copy pty master output to stdout and file */
/* TODO: don't use full_write's, use proper write buffering */
while (fd_count && !bb_got_signal) {
/* not safe_poll! we want SIGCHLD to EINTR poll */
if (poll(pfd, fd_count, -1) < 0 && errno != EINTR) {
/* If child exits too quickly, we may get EIO:
* for example, try "script -c true" */
break;
}
if (pfd[0].revents) {
errno = 0;
count = safe_read(pty, buf, COMMON_BUFSIZE);
if (count <= 0 && errno != EAGAIN) {
/* err/eof from pty: exit */
goto restore;
}
if (count > 0) {
if (opt & OPT_t) {
struct timeval tv;
double newtime;
gettimeofday(&tv, NULL);
newtime = tv.tv_sec + (double) tv.tv_usec / 1000000;
fprintf(timing_fp, "%f %u\n", newtime - oldtime, count);
oldtime = newtime;
}
full_write(STDOUT_FILENO, buf, count);
full_write(outfd, buf, count);
// If we'd be using (buffered) FILE i/o, we'd need this:
//if (opt & OPT_f) {
// fflush(outfd);
//}
}
}
if (pfd[1].revents) {
count = safe_read(STDIN_FILENO, buf, COMMON_BUFSIZE);
if (count <= 0) {
/* err/eof from stdin: don't read stdin anymore */
pfd[1].revents = 0;
fd_count--;
} else {
full_write(pty, buf, count);
}
}
}
/* If loop was exited because SIGCHLD handler set bb_got_signal,
* there still can be some buffered output. But dont loop forever:
* we won't pump orphaned grandchildren's output indefinitely.
* Testcase: running this in script:
* exec dd if=/dev/zero bs=1M count=1
* must have "1+0 records in, 1+0 records out" captured too.
* (util-linux's script doesn't do this. buggy :) */
loop = 999;
/* pty is in O_NONBLOCK mode, we exit as soon as buffer is empty */
while (--loop && (count = safe_read(pty, buf, COMMON_BUFSIZE)) > 0) {
full_write(STDOUT_FILENO, buf, count);
full_write(outfd, buf, count);
}
restore:
if (attr_ok == 0)
tcsetattr(0, TCSAFLUSH, &tt);
if (!(opt & OPT_q))
printf("Script done, file is %s\n", fname);
return EXIT_SUCCESS;
}
/* child: make pty slave to be input, output, error; run shell */
close(pty); /* close pty master */
/* open pty slave to fd 0,1,2 */
close(0);
xopen(pty_line, O_RDWR); /* uses fd 0 */
xdup2(0, 1);
xdup2(0, 2);
/* copy our original stdin tty's parameters to pty */
if (attr_ok == 0)
tcsetattr(0, TCSAFLUSH, &tt);
if (winsz_ok == 0)
ioctl(0, TIOCSWINSZ, (char *)&win);
/* set pty as a controlling tty */
setsid();
ioctl(0, TIOCSCTTY, 0 /* 0: don't forcibly steal */);
/* Non-ignored signals revert to SIG_DFL on exec anyway */
/*signal(SIGCHLD, SIG_DFL);*/
execl(shell, shell, shell_opt, shell_arg, (char *) NULL);
bb_simple_perror_msg_and_die(shell);
}