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- /* vi: set sw=4 ts=4: */
- /* agetty.c - another getty program for Linux. By W. Z. Venema 1989
- Ported to Linux by Peter Orbaek <poe@daimi.aau.dk>
- This program is freely distributable. The entire man-page used to
- be here. Now read the real man-page agetty.8 instead.
- -f option added by Eric Rasmussen <ear@usfirst.org> - 12/28/95
- 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
- - added Native Language Support
- 1999-05-05 Thorsten Kranzkowski <dl8bcu@gmx.net>
- - enable hardware flow control before displaying /etc/issue
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <string.h>
- #include <sys/ioctl.h>
- #include <errno.h>
- #include <sys/stat.h>
- #include <sys/signal.h>
- #include <fcntl.h>
- #include <stdarg.h>
- #include <ctype.h>
- #include <utmp.h>
- #include <getopt.h>
- #include <termios.h>
- #include "busybox.h"
- #define _PATH_LOGIN "/bin/login"
- /* If USE_SYSLOG is undefined all diagnostics go directly to /dev/console. */
- #ifdef CONFIG_SYSLOGD
- #include <sys/param.h>
- #define USE_SYSLOG
- #include <syslog.h>
- #endif
- /*
- * Some heuristics to find out what environment we are in: if it is not
- * System V, assume it is SunOS 4.
- */
- #ifdef LOGIN_PROCESS /* defined in System V utmp.h */
- #define SYSV_STYLE /* select System V style getty */
- #ifdef CONFIG_FEATURE_U_W_TMP
- extern void updwtmp(const char *filename, const struct utmp *ut);
- #endif
- #endif /* LOGIN_PROCESS */
- /*
- * Things you may want to modify.
- *
- * If ISSUE is not defined, agetty will never display the contents of the
- * /etc/issue file. You will not want to spit out large "issue" files at the
- * wrong baud rate. Relevant for System V only.
- *
- * You may disagree with the default line-editing etc. characters defined
- * below. Note, however, that DEL cannot be used for interrupt generation
- * and for line editing at the same time.
- */
- #ifdef SYSV_STYLE
- #define ISSUE "/etc/issue" /* displayed before the login prompt */
- #include <sys/utsname.h>
- #include <time.h>
- #endif
- /* Some shorthands for control characters. */
- #define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */
- #define CR CTL('M') /* carriage return */
- #define NL CTL('J') /* line feed */
- #define BS CTL('H') /* back space */
- #define DEL CTL('?') /* delete */
- /* Defaults for line-editing etc. characters; you may want to change this. */
- #define DEF_ERASE DEL /* default erase character */
- #define DEF_INTR CTL('C') /* default interrupt character */
- #define DEF_QUIT CTL('\\') /* default quit char */
- #define DEF_KILL CTL('U') /* default kill char */
- #define DEF_EOF CTL('D') /* default EOF char */
- #define DEF_EOL '\n'
- #define DEF_SWITCH 0 /* default switch char */
- /*
- * SunOS 4.1.1 termio is broken. We must use the termios stuff instead,
- * because the termio -> termios translation does not clear the termios
- * CIBAUD bits. Therefore, the tty driver would sometimes report that input
- * baud rate != output baud rate. I did not notice that problem with SunOS
- * 4.1. We will use termios where available, and termio otherwise.
- */
- /* linux 0.12 termio is broken too, if we use it c_cc[VERASE] isn't set
- properly, but all is well if we use termios?! */
- #ifdef TCGETS
- #undef TCGETA
- #undef TCSETA
- #undef TCSETAW
- #define termio termios
- #define TCGETA TCGETS
- #define TCSETA TCSETS
- #define TCSETAW TCSETSW
- #endif
- /*
- * This program tries to not use the standard-i/o library. This keeps the
- * executable small on systems that do not have shared libraries (System V
- * Release <3).
- */
- #ifndef BUFSIZ
- #define BUFSIZ 1024
- #endif
- /*
- * When multiple baud rates are specified on the command line, the first one
- * we will try is the first one specified.
- */
- #define FIRST_SPEED 0
- /* Storage for command-line options. */
- #define MAX_SPEED 10 /* max. nr. of baud rates */
- struct options {
- int flags; /* toggle switches, see below */
- int timeout; /* time-out period */
- char *login; /* login program */
- char *tty; /* name of tty */
- char *initstring; /* modem init string */
- char *issue; /* alternative issue file */
- int numspeed; /* number of baud rates to try */
- int speeds[MAX_SPEED]; /* baud rates to be tried */
- };
- #define F_PARSE (1<<0) /* process modem status messages */
- #define F_ISSUE (1<<1) /* display /etc/issue */
- #define F_RTSCTS (1<<2) /* enable RTS/CTS flow control */
- #define F_LOCAL (1<<3) /* force local */
- #define F_INITSTRING (1<<4) /* initstring is set */
- #define F_WAITCRLF (1<<5) /* wait for CR or LF */
- #define F_CUSTISSUE (1<<6) /* give alternative issue file */
- #define F_NOPROMPT (1<<7) /* don't ask for login name! */
- /* Storage for things detected while the login name was read. */
- static struct chardata {
- int erase; /* erase character */
- int kill; /* kill character */
- int eol; /* end-of-line character */
- int parity; /* what parity did we see */
- int capslock; /* upper case without lower case */
- };
- /* Initial values for the above. */
- static struct chardata init_chardata = {
- DEF_ERASE, /* default erase character */
- DEF_KILL, /* default kill character */
- 13, /* default eol char */
- 0, /* space parity */
- 0, /* no capslock */
- };
- #if 0
- struct Speedtab {
- long speed;
- int code;
- };
- static struct Speedtab speedtab[] = {
- {50, B50},
- {75, B75},
- {110, B110},
- {134, B134},
- {150, B150},
- {200, B200},
- {300, B300},
- {600, B600},
- {1200, B1200},
- {1800, B1800},
- {2400, B2400},
- {4800, B4800},
- {9600, B9600},
- #ifdef B19200
- {19200, B19200},
- #endif
- #ifdef B38400
- {38400, B38400},
- #endif
- #ifdef EXTA
- {19200, EXTA},
- #endif
- #ifdef EXTB
- {38400, EXTB},
- #endif
- #ifdef B57600
- {57600, B57600},
- #endif
- #ifdef B115200
- {115200, B115200},
- #endif
- #ifdef B230400
- {230400, B230400},
- #endif
- {0, 0},
- };
- #endif
- static void parse_args(int argc, char **argv, struct options *op);
- static void parse_speeds(struct options *op, char *arg);
- static void open_tty(char *tty, struct termio *tp, int local);
- static void termio_init(struct termio *tp, int speed, struct options *op);
- static void auto_baud(struct termio *tp);
- static void do_prompt(struct options *op, struct termio *tp);
- static void next_speed(struct termio *tp, struct options *op);
- static char *get_logname(struct options *op, struct chardata *cp,
- struct termio *tp);
- static void termio_final(struct options *op, struct termio *tp,
- struct chardata *cp);
- static int caps_lock(const char *s);
- static int bcode(char *s);
- static void error(const char *fmt, ...) __attribute__ ((noreturn));
- #ifdef CONFIG_FEATURE_U_W_TMP
- static void update_utmp(char *line);
- #endif
- /* The following is used for understandable diagnostics. */
- /* Fake hostname for ut_host specified on command line. */
- static char *fakehost = NULL;
- /* ... */
- #ifdef DEBUGGING
- #define debug(s) fprintf(dbf,s); fflush(dbf)
- #define DEBUGTERM "/dev/ttyp0"
- FILE *dbf;
- #else
- #define debug(s) /* nothing */
- #endif
- int getty_main(int argc, char **argv)
- {
- char *logname = NULL; /* login name, given to /bin/login */
- struct chardata chardata; /* set by get_logname() */
- struct termio termio; /* terminal mode bits */
- static struct options options = {
- F_ISSUE, /* show /etc/issue (SYSV_STYLE) */
- 0, /* no timeout */
- _PATH_LOGIN, /* default login program */
- "tty1", /* default tty line */
- "", /* modem init string */
- ISSUE, /* default issue file */
- 0, /* no baud rates known yet */
- };
- #ifdef DEBUGGING
- dbf = bb_xfopen(DEBUGTERM, "w");
- {
- int i;
- for (i = 1; i < argc; i++) {
- debug(argv[i]);
- debug("\n");
- }
- }
- #endif
- /* Parse command-line arguments. */
- parse_args(argc, argv, &options);
- #ifdef __linux__
- setsid();
- #endif
- /* Update the utmp file. */
- #ifdef SYSV_STYLE
- #ifdef CONFIG_FEATURE_U_W_TMP
- update_utmp(options.tty);
- #endif
- #endif
- debug("calling open_tty\n");
- /* Open the tty as standard { input, output, error }. */
- open_tty(options.tty, &termio, options.flags & F_LOCAL);
- #ifdef __linux__
- {
- int iv;
- iv = getpid();
- ioctl(0, TIOCSPGRP, &iv);
- }
- #endif
- /* Initialize the termio settings (raw mode, eight-bit, blocking i/o). */
- debug("calling termio_init\n");
- termio_init(&termio, options.speeds[FIRST_SPEED], &options);
- /* write the modem init string and DON'T flush the buffers */
- if (options.flags & F_INITSTRING) {
- debug("writing init string\n");
- write(1, options.initstring, strlen(options.initstring));
- }
- if (!(options.flags & F_LOCAL)) {
- /* go to blocking write mode unless -L is specified */
- fcntl(1, F_SETFL, fcntl(1, F_GETFL, 0) & ~O_NONBLOCK);
- }
- /* Optionally detect the baud rate from the modem status message. */
- debug("before autobaud\n");
- if (options.flags & F_PARSE)
- auto_baud(&termio);
- /* Set the optional timer. */
- if (options.timeout)
- (void) alarm((unsigned) options.timeout);
- /* optionally wait for CR or LF before writing /etc/issue */
- if (options.flags & F_WAITCRLF) {
- char ch;
- debug("waiting for cr-lf\n");
- while (read(0, &ch, 1) == 1) {
- ch &= 0x7f; /* strip "parity bit" */
- #ifdef DEBUGGING
- fprintf(dbf, "read %c\n", ch);
- #endif
- if (ch == '\n' || ch == '\r')
- break;
- }
- }
- chardata = init_chardata;
- if (!(options.flags & F_NOPROMPT)) {
- /* Read the login name. */
- debug("reading login name\n");
- /* while ((logname = get_logname(&options, &chardata, &termio)) == 0) */
- while ((logname = get_logname(&options, &chardata, &termio)) ==
- NULL) next_speed(&termio, &options);
- }
- /* Disable timer. */
- if (options.timeout)
- (void) alarm(0);
- /* Finalize the termio settings. */
- termio_final(&options, &termio, &chardata);
- /* Now the newline character should be properly written. */
- (void) write(1, "\n", 1);
- /* Let the login program take care of password validation. */
- (void) execl(options.login, options.login, "--", logname, (char *) 0);
- error("%s: can't exec %s: %m", options.tty, options.login);
- }
- /* parse-args - parse command-line arguments */
- static void parse_args(int argc, char **argv, struct options *op)
- {
- extern char *optarg; /* getopt */
- extern int optind; /* getopt */
- int c;
- while (isascii(c = getopt(argc, argv, "I:LH:f:hil:mt:wn"))) {
- switch (c) {
- case 'I':
- if (!(op->initstring = strdup(optarg)))
- error(bb_msg_memory_exhausted);
- {
- const char *p;
- char *q;
- /* copy optarg into op->initstring decoding \ddd
- octal codes into chars */
- q = op->initstring;
- p = optarg;
- while (*p) {
- if (*p == '\\') {
- p++;
- *q++ = bb_process_escape_sequence(&p);
- } else {
- *q++ = *p++;
- }
- }
- *q = '\0';
- }
- op->flags |= F_INITSTRING;
- break;
- case 'L': /* force local */
- op->flags |= F_LOCAL;
- break;
- case 'H': /* fake login host */
- fakehost = optarg;
- break;
- case 'f': /* custom issue file */
- op->flags |= F_CUSTISSUE;
- op->issue = optarg;
- break;
- case 'h': /* enable h/w flow control */
- op->flags |= F_RTSCTS;
- break;
- case 'i': /* do not show /etc/issue */
- op->flags &= ~F_ISSUE;
- break;
- case 'l':
- op->login = optarg; /* non-default login program */
- break;
- case 'm': /* parse modem status message */
- op->flags |= F_PARSE;
- break;
- case 'n':
- op->flags |= F_NOPROMPT;
- break;
- case 't': /* time out */
- if ((op->timeout = atoi(optarg)) <= 0)
- error("bad timeout value: %s", optarg);
- break;
- case 'w':
- op->flags |= F_WAITCRLF;
- break;
- default:
- bb_show_usage();
- }
- }
- debug("after getopt loop\n");
- if (argc < optind + 2) /* check parameter count */
- bb_show_usage();
- /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
- if ('0' <= argv[optind][0] && argv[optind][0] <= '9') {
- /* a number first, assume it's a speed (BSD style) */
- parse_speeds(op, argv[optind++]); /* baud rate(s) */
- op->tty = argv[optind]; /* tty name */
- } else {
- op->tty = argv[optind++]; /* tty name */
- parse_speeds(op, argv[optind]); /* baud rate(s) */
- }
- optind++;
- if (argc > optind && argv[optind])
- setenv("TERM", argv[optind], 1);
- debug("exiting parseargs\n");
- }
- /* parse_speeds - parse alternate baud rates */
- static void parse_speeds(struct options *op, char *arg)
- {
- char *cp;
- debug("entered parse_speeds\n");
- for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *) 0, ",")) {
- if ((op->speeds[op->numspeed++] = bcode(cp)) <= 0)
- error("bad speed: %s", cp);
- if (op->numspeed > MAX_SPEED)
- error("too many alternate speeds");
- }
- debug("exiting parsespeeds\n");
- }
- #ifdef SYSV_STYLE
- #ifdef CONFIG_FEATURE_U_W_TMP
- /* update_utmp - update our utmp entry */
- static void update_utmp(char *line)
- {
- struct utmp ut;
- struct utmp *utp;
- time_t t;
- int mypid = getpid();
- #if ! (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1))
- struct flock lock;
- #endif
- /*
- * The utmp file holds miscellaneous information about things started by
- * /sbin/init and other system-related events. Our purpose is to update
- * the utmp entry for the current process, in particular the process type
- * and the tty line we are listening to. Return successfully only if the
- * utmp file can be opened for update, and if we are able to find our
- * entry in the utmp file.
- */
- if (access(_PATH_UTMP, R_OK|W_OK) == -1) {
- close(creat(_PATH_UTMP, 0664));
- }
- utmpname(_PATH_UTMP);
- setutent();
- while ((utp = getutent())
- && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid)) /* nothing */
- ;
- if (utp) {
- memcpy(&ut, utp, sizeof(ut));
- } else {
- /* some inits don't initialize utmp... */
- memset(&ut, 0, sizeof(ut));
- strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
- }
- /*endutent(); */
- strncpy(ut.ut_user, "LOGIN", sizeof(ut.ut_user));
- strncpy(ut.ut_line, line, sizeof(ut.ut_line));
- if (fakehost)
- strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
- time(&t);
- ut.ut_time = t;
- ut.ut_type = LOGIN_PROCESS;
- ut.ut_pid = mypid;
- pututline(&ut);
- endutent();
- {
- if (access(_PATH_WTMP, R_OK|W_OK) == -1) {
- close(creat(_PATH_WTMP, 0664));
- }
- updwtmp(_PATH_WTMP, &ut);
- }
- }
- #endif /* CONFIG_FEATURE_U_W_TMP */
- #endif /* SYSV_STYLE */
- /* open_tty - set up tty as standard { input, output, error } */
- static void open_tty(char *tty, struct termio *tp, int local)
- {
- /* Get rid of the present standard { output, error} if any. */
- (void) close(1);
- (void) close(2);
- errno = 0; /* ignore above errors */
- /* Set up new standard input, unless we are given an already opened port. */
- if (strcmp(tty, "-")) {
- struct stat st;
- /* Sanity checks... */
- if (chdir("/dev"))
- error("/dev: chdir() failed: %m");
- if (stat(tty, &st) < 0)
- error("/dev/%s: %m", tty);
- if ((st.st_mode & S_IFMT) != S_IFCHR)
- error("/dev/%s: not a character device", tty);
- /* Open the tty as standard input. */
- (void) close(0);
- errno = 0; /* ignore close(2) errors */
- debug("open(2)\n");
- if (open(tty, O_RDWR | O_NONBLOCK, 0) != 0)
- error("/dev/%s: cannot open as standard input: %m", tty);
- } else {
- /*
- * Standard input should already be connected to an open port. Make
- * sure it is open for read/write.
- */
- if ((fcntl(0, F_GETFL, 0) & O_RDWR) != O_RDWR)
- error("%s: not open for read/write", tty);
- }
- /* Set up standard output and standard error file descriptors. */
- debug("duping\n");
- if (dup(0) != 1 || dup(0) != 2) /* set up stdout and stderr */
- error("%s: dup problem: %m", tty); /* we have a problem */
- /*
- * The following ioctl will fail if stdin is not a tty, but also when
- * there is noise on the modem control lines. In the latter case, the
- * common course of action is (1) fix your cables (2) give the modem more
- * time to properly reset after hanging up. SunOS users can achieve (2)
- * by patching the SunOS kernel variable "zsadtrlow" to a larger value;
- * 5 seconds seems to be a good value.
- */
- if (ioctl(0, TCGETA, tp) < 0)
- error("%s: ioctl: %m", tty);
- /*
- * It seems to be a terminal. Set proper protections and ownership. Mode
- * 0622 is suitable for SYSV <4 because /bin/login does not change
- * protections. SunOS 4 login will change the protections to 0620 (write
- * access for group tty) after the login has succeeded.
- */
- #ifdef DEBIAN
- {
- /* tty to root.dialout 660 */
- struct group *gr;
- int id;
- id = (gr = getgrnam("dialout")) ? gr->gr_gid : 0;
- chown(tty, 0, id);
- chmod(tty, 0660);
- /* vcs,vcsa to root.sys 600 */
- if (!strncmp(tty, "tty", 3) && isdigit(tty[3])) {
- char *vcs, *vcsa;
- if (!(vcs = strdup(tty)))
- error("Can't malloc for vcs");
- if (!(vcsa = malloc(strlen(tty) + 2)))
- error("Can't malloc for vcsa");
- strcpy(vcs, "vcs");
- strcpy(vcs + 3, tty + 3);
- strcpy(vcsa, "vcsa");
- strcpy(vcsa + 4, tty + 3);
- id = (gr = getgrnam("sys")) ? gr->gr_gid : 0;
- chown(vcs, 0, id);
- chmod(vcs, 0600);
- chown(vcsa, 0, id);
- chmod(vcs, 0600);
- free(vcs);
- free(vcsa);
- }
- }
- #else
- (void) chown(tty, 0, 0); /* root, sys */
- (void) chmod(tty, 0622); /* crw--w--w- */
- errno = 0; /* ignore above errors */
- #endif
- }
- /* termio_init - initialize termio settings */
- static void termio_init(struct termio *tp, int speed, struct options *op)
- {
- /*
- * Initial termio settings: 8-bit characters, raw-mode, blocking i/o.
- * Special characters are set after we have read the login name; all
- * reads will be done in raw mode anyway. Errors will be dealt with
- * lateron.
- */
- #ifdef __linux__
- /* flush input and output queues, important for modems! */
- (void) ioctl(0, TCFLSH, TCIOFLUSH);
- #endif
- tp->c_cflag = CS8 | HUPCL | CREAD | speed;
- if (op->flags & F_LOCAL) {
- tp->c_cflag |= CLOCAL;
- }
- tp->c_iflag = tp->c_lflag = tp->c_oflag = tp->c_line = 0;
- tp->c_cc[VMIN] = 1;
- tp->c_cc[VTIME] = 0;
- /* Optionally enable hardware flow control */
- #ifdef CRTSCTS
- if (op->flags & F_RTSCTS)
- tp->c_cflag |= CRTSCTS;
- #endif
- (void) ioctl(0, TCSETA, tp);
- /* go to blocking input even in local mode */
- fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK);
- debug("term_io 2\n");
- }
- /* auto_baud - extract baud rate from modem status message */
- static void auto_baud(struct termio *tp)
- {
- int speed;
- int vmin;
- unsigned iflag;
- char buf[BUFSIZ];
- char *bp;
- int nread;
- /*
- * This works only if the modem produces its status code AFTER raising
- * the DCD line, and if the computer is fast enough to set the proper
- * baud rate before the message has gone by. We expect a message of the
- * following format:
- *
- * <junk><number><junk>
- *
- * The number is interpreted as the baud rate of the incoming call. If the
- * modem does not tell us the baud rate within one second, we will keep
- * using the current baud rate. It is advisable to enable BREAK
- * processing (comma-separated list of baud rates) if the processing of
- * modem status messages is enabled.
- */
- /*
- * Use 7-bit characters, don't block if input queue is empty. Errors will
- * be dealt with lateron.
- */
- iflag = tp->c_iflag;
- tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
- vmin = tp->c_cc[VMIN];
- tp->c_cc[VMIN] = 0; /* don't block if queue empty */
- (void) ioctl(0, TCSETA, tp);
- /*
- * Wait for a while, then read everything the modem has said so far and
- * try to extract the speed of the dial-in call.
- */
- (void) sleep(1);
- if ((nread = read(0, buf, sizeof(buf) - 1)) > 0) {
- buf[nread] = '\0';
- for (bp = buf; bp < buf + nread; bp++) {
- if (isascii(*bp) && isdigit(*bp)) {
- if ((speed = bcode(bp))) {
- tp->c_cflag &= ~CBAUD;
- tp->c_cflag |= speed;
- }
- break;
- }
- }
- }
- /* Restore terminal settings. Errors will be dealt with lateron. */
- tp->c_iflag = iflag;
- tp->c_cc[VMIN] = vmin;
- (void) ioctl(0, TCSETA, tp);
- }
- /* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
- static void do_prompt(struct options *op, struct termio *tp)
- {
- #ifdef ISSUE /* optional: show /etc/issue */
- print_login_issue(op->issue, op->tty);
- #endif
- print_login_prompt();
- }
- /* next_speed - select next baud rate */
- static void next_speed(struct termio *tp, struct options *op)
- {
- static int baud_index = FIRST_SPEED; /* current speed index */
- baud_index = (baud_index + 1) % op->numspeed;
- tp->c_cflag &= ~CBAUD;
- tp->c_cflag |= op->speeds[baud_index];
- (void) ioctl(0, TCSETA, tp);
- }
- /* get_logname - get user name, establish parity, speed, erase, kill, eol */
- /* return NULL on failure, logname on success */
- static char *get_logname(struct options *op, struct chardata *cp, struct termio *tp)
- {
- static char logname[BUFSIZ];
- char *bp;
- char c; /* input character, full eight bits */
- char ascval; /* low 7 bits of input character */
- int bits; /* # of "1" bits per character */
- int mask; /* mask with 1 bit up */
- static char *erase[] = { /* backspace-space-backspace */
- "\010\040\010", /* space parity */
- "\010\040\010", /* odd parity */
- "\210\240\210", /* even parity */
- "\210\240\210", /* no parity */
- };
- /* Initialize kill, erase, parity etc. (also after switching speeds). */
- *cp = init_chardata;
- /* Flush pending input (esp. after parsing or switching the baud rate). */
- (void) sleep(1);
- (void) ioctl(0, TCFLSH, TCIFLUSH);
- /* Prompt for and read a login name. */
- for (*logname = 0; *logname == 0; /* void */ ) {
- /* Write issue file and prompt, with "parity" bit == 0. */
- do_prompt(op, tp);
- /* Read name, watch for break, parity, erase, kill, end-of-line. */
- for (bp = logname, cp->eol = 0; cp->eol == 0; /* void */ ) {
- /* Do not report trivial EINTR/EIO errors. */
- if (read(0, &c, 1) < 1) {
- if (errno == EINTR || errno == EIO)
- exit(0);
- error("%s: read: %m", op->tty);
- }
- /* Do BREAK handling elsewhere. */
- if ((c == 0) && op->numspeed > 1)
- /* return (0); */
- return NULL;
- /* Do parity bit handling. */
- if (c != (ascval = (c & 0177))) { /* "parity" bit on ? */
- for (bits = 1, mask = 1; mask & 0177; mask <<= 1)
- if (mask & ascval)
- bits++; /* count "1" bits */
- cp->parity |= ((bits & 1) ? 1 : 2);
- }
- /* Do erase, kill and end-of-line processing. */
- switch (ascval) {
- case CR:
- case NL:
- *bp = 0; /* terminate logname */
- cp->eol = ascval; /* set end-of-line char */
- break;
- case BS:
- case DEL:
- case '#':
- cp->erase = ascval; /* set erase character */
- if (bp > logname) {
- (void) write(1, erase[cp->parity], 3);
- bp--;
- }
- break;
- case CTL('U'):
- case '@':
- cp->kill = ascval; /* set kill character */
- while (bp > logname) {
- (void) write(1, erase[cp->parity], 3);
- bp--;
- }
- break;
- case CTL('D'):
- exit(0);
- default:
- if (!isascii(ascval) || !isprint(ascval)) {
- /* ignore garbage characters */ ;
- } else if (bp - logname >= sizeof(logname) - 1) {
- error("%s: input overrun", op->tty);
- } else {
- (void) write(1, &c, 1); /* echo the character */
- *bp++ = ascval; /* and store it */
- }
- break;
- }
- }
- }
- /* Handle names with upper case and no lower case. */
- if ((cp->capslock = caps_lock(logname))) {
- for (bp = logname; *bp; bp++)
- if (isupper(*bp))
- *bp = tolower(*bp); /* map name to lower case */
- }
- return (logname);
- }
- /* termio_final - set the final tty mode bits */
- static void termio_final(struct options *op, struct termio *tp, struct chardata *cp)
- {
- /* General terminal-independent stuff. */
- tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */
- tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
- /* no longer| ECHOCTL | ECHOPRT */
- tp->c_oflag |= OPOST;
- /* tp->c_cflag = 0; */
- tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */
- tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */
- tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */
- tp->c_cc[VEOL] = DEF_EOL;
- tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */
- /* Account for special characters seen in input. */
- if (cp->eol == CR) {
- tp->c_iflag |= ICRNL; /* map CR in input to NL */
- tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */
- }
- tp->c_cc[VERASE] = cp->erase; /* set erase character */
- tp->c_cc[VKILL] = cp->kill; /* set kill character */
- /* Account for the presence or absence of parity bits in input. */
- switch (cp->parity) {
- case 0: /* space (always 0) parity */
- break;
- case 1: /* odd parity */
- tp->c_cflag |= PARODD;
- /* FALLTHROUGH */
- case 2: /* even parity */
- tp->c_cflag |= PARENB;
- tp->c_iflag |= INPCK | ISTRIP;
- /* FALLTHROUGH */
- case (1 | 2): /* no parity bit */
- tp->c_cflag &= ~CSIZE;
- tp->c_cflag |= CS7;
- break;
- }
- /* Account for upper case without lower case. */
- if (cp->capslock) {
- tp->c_iflag |= IUCLC;
- tp->c_lflag |= XCASE;
- tp->c_oflag |= OLCUC;
- }
- /* Optionally enable hardware flow control */
- #ifdef CRTSCTS
- if (op->flags & F_RTSCTS)
- tp->c_cflag |= CRTSCTS;
- #endif
- /* Finally, make the new settings effective */
- if (ioctl(0, TCSETA, tp) < 0)
- error("%s: ioctl: TCSETA: %m", op->tty);
- }
- /* caps_lock - string contains upper case without lower case */
- /* returns 1 if true, 0 if false */
- static int caps_lock(const char *s)
- {
- int capslock;
- for (capslock = 0; *s; s++) {
- if (islower(*s))
- return (0);
- if (capslock == 0)
- capslock = isupper(*s);
- }
- return (capslock);
- }
- /* bcode - convert speed string to speed code; return 0 on failure */
- static int bcode(char *s)
- {
- int r;
- unsigned long value;
- if (safe_strtoul(s, &value)) {
- return -1;
- }
- if ((r = bb_value_to_baud(value)) > 0) {
- return r;
- }
- return 0;
- }
- /* error - report errors to console or syslog; only understands %s and %m */
- #define str2cpy(b,s1,s2) strcat(strcpy(b,s1),s2)
- /*
- * output error messages
- */
- static void error(const char *fmt, ...)
- {
- va_list va_alist;
- char buf[256], *bp;
- #ifndef USE_SYSLOG
- int fd;
- #endif
- #ifdef USE_SYSLOG
- buf[0] = '\0';
- bp = buf;
- #else
- strncpy(buf, bb_applet_name, 256);
- strncat(buf, ": ", 256);
- buf[255] = 0;
- bp = buf + strlen(buf);
- #endif
- va_start(va_alist, fmt);
- vsnprintf(bp, 256 - strlen(buf), fmt, va_alist);
- buf[255] = 0;
- va_end(va_alist);
- #ifdef USE_SYSLOG
- openlog(bb_applet_name, 0, LOG_AUTH);
- syslog(LOG_ERR, "%s", buf);
- closelog();
- #else
- strncat(bp, "\r\n", 256 - strlen(buf));
- buf[255] = 0;
- if ((fd = open("/dev/console", 1)) >= 0) {
- write(fd, buf, strlen(buf));
- close(fd);
- }
- #endif
- (void) sleep((unsigned) 10); /* be kind to init(8) */
- exit(1);
- }
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