--- trunk/mkinitrd-magellan/busybox/loginutils/getty.c 2007/09/01 22:45:15 532 +++ trunk/mkinitrd-magellan/busybox/loginutils/getty.c 2009/04/24 18:33:46 816 @@ -6,21 +6,20 @@ * * option added by Eric Rasmussen - 12/28/95 * - * 1999-02-22 Arkadiusz Mi¶kiewicz + * 1999-02-22 Arkadiusz Mickiewicz * - added Native Language Support - + * * 1999-05-05 Thorsten Kranzkowski * - enable hardware flow control before displaying /etc/issue * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. - * */ -#include "busybox.h" +#include "libbb.h" #include #if ENABLE_FEATURE_UTMP -#include +#include /* updwtmp() */ #endif /* @@ -28,13 +27,13 @@ * System V, assume it is SunOS 4. */ #ifdef LOGIN_PROCESS /* defined in System V utmp.h */ -#define SYSV_STYLE /* select System V style getty */ #include #include -#if ENABLE_FEATURE_WTMP -extern void updwtmp(const char *filename, const struct utmp *ut); -static void update_utmp(char *line); -#endif +#else /* if !sysV style, wtmp/utmp code is off */ +#undef ENABLE_FEATURE_UTMP +#undef ENABLE_FEATURE_WTMP +#define ENABLE_FEATURE_UTMP 0 +#define ENABLE_FEATURE_WTMP 0 #endif /* LOGIN_PROCESS */ /* @@ -47,6 +46,7 @@ /* I doubt there are systems which still need this */ #undef HANDLE_ALLCAPS +#undef ANCIENT_BS_KILL_CHARS #define _PATH_LOGIN "/bin/login" @@ -57,7 +57,7 @@ #define ISSUE "/etc/issue" /* displayed before the login prompt */ /* Some shorthands for control characters. */ -#define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */ +#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 */ @@ -76,47 +76,39 @@ * 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 */ +/* Storage for command-line options. */ struct options { int flags; /* toggle switches, see below */ unsigned timeout; /* time-out period */ - char *login; /* login program */ - char *tty; /* name of tty */ - char *initstring; /* modem init string */ - char *issue; /* alternative issue file */ + const char *login; /* login program */ + const char *tty; /* name of tty */ + const char *initstring; /* modem init string */ + const char *issue; /* alternative issue file */ int numspeed; /* number of baud rates to try */ int speeds[MAX_SPEED]; /* baud rates to be tried */ }; -static const char opt_string[] = "I:LH:f:hil:mt:wn"; -#define F_INITSTRING (1<<0) /* initstring is set */ -#define F_LOCAL (1<<1) /* force local */ -#define F_FAKEHOST (1<<2) /* force fakehost */ -#define F_CUSTISSUE (1<<3) /* give alternative issue file */ -#define F_RTSCTS (1<<4) /* enable RTS/CTS flow control */ -#define F_ISSUE (1<<5) /* display /etc/issue */ -#define F_LOGIN (1<<6) /* non-default login program */ -#define F_PARSE (1<<7) /* process modem status messages */ -#define F_TIMEOUT (1<<8) /* time out */ -#define F_WAITCRLF (1<<9) /* wait for CR or LF */ -#define F_NOPROMPT (1<<10) /* don't ask for login name! */ - /* Storage for things detected while the login name was read. */ struct chardata { unsigned char erase; /* erase character */ unsigned char kill; /* kill character */ unsigned char eol; /* end-of-line character */ unsigned char parity; /* what parity did we see */ + /* (parity & 1): saw odd parity char with 7th bit set */ + /* (parity & 2): saw even parity char with 7th bit set */ + /* parity == 0: probably 7-bit, space parity? */ + /* parity == 1: probably 7-bit, odd parity? */ + /* parity == 2: probably 7-bit, even parity? */ + /* parity == 3: definitely 8 bit, no parity! */ + /* Hmm... with any value of "parity" 8 bit, no parity is possible */ #ifdef HANDLE_ALLCAPS unsigned char capslock; /* upper case without lower case */ #endif }; + /* Initial values for the above. */ static const struct chardata init_chardata = { DEF_ERASE, /* default erase character */ @@ -128,66 +120,74 @@ #endif }; -/* The following is used for understandable diagnostics. */ +static const char opt_string[] ALIGN1 = "I:LH:f:hil:mt:wn"; +#define F_INITSTRING (1 << 0) /* -I initstring is set */ +#define F_LOCAL (1 << 1) /* -L force local */ +#define F_FAKEHOST (1 << 2) /* -H fake hostname */ +#define F_CUSTISSUE (1 << 3) /* -f give alternative issue file */ +#define F_RTSCTS (1 << 4) /* -h enable RTS/CTS flow control */ +#define F_ISSUE (1 << 5) /* -i display /etc/issue */ +#define F_LOGIN (1 << 6) /* -l non-default login program */ +#define F_PARSE (1 << 7) /* -m process modem status messages */ +#define F_TIMEOUT (1 << 8) /* -t time out */ +#define F_WAITCRLF (1 << 9) /* -w wait for CR or LF */ +#define F_NOPROMPT (1 << 10) /* -n don't ask for login name */ -/* Fake hostname for ut_host specified on command line. */ -static char *fakehost = NULL; -/* ... */ +#define line_buf bb_common_bufsiz1 + +/* The following is used for understandable diagnostics. */ #ifdef DEBUGGING -#define debug(s) fprintf(dbf,s); fflush(dbf) -#define DEBUGTERM "/dev/ttyp0" static FILE *dbf; +#define DEBUGTERM "/dev/ttyp0" +#define debug(...) do { fprintf(dbf, __VA_ARGS__); fflush(dbf); } while (0) #else -#define debug(s) /* nothing */ +#define debug(...) ((void)0) #endif -/* bcode - convert speed string to speed code; return 0 on failure */ +/* bcode - convert speed string to speed code; return <= 0 on failure */ static int bcode(const char *s) { - int r; - unsigned value = bb_strtou(s, NULL, 10); - if (errno) { - return -1; - } - r = tty_value_to_baud(value); - if (r > 0) { - return r; - } - return 0; + int value = bb_strtou(s, NULL, 10); /* yes, int is intended! */ + if (value < 0) /* bad terminating char, overflow, etc */ + return value; + return tty_value_to_baud(value); } - /* parse_speeds - parse alternate baud rates */ static void parse_speeds(struct options *op, char *arg) { char *cp; + /* NB: at least one iteration is always done */ debug("entered parse_speeds\n"); - for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *) 0, ",")) { - if ((op->speeds[op->numspeed++] = bcode(cp)) <= 0) + while ((cp = strsep(&arg, ",")) != NULL) { + op->speeds[op->numspeed] = bcode(cp); + if (op->speeds[op->numspeed] <= 0) bb_error_msg_and_die("bad speed: %s", cp); + op->numspeed++; if (op->numspeed > MAX_SPEED) bb_error_msg_and_die("too many alternate speeds"); } - debug("exiting parsespeeds\n"); + debug("exiting parse_speeds\n"); } - /* parse_args - parse command-line arguments */ -static void parse_args(int argc, char **argv, struct options *op) +static void parse_args(char **argv, struct options *op, char **fakehost_p) { char *ts; - op->flags = getopt32(argc, argv, opt_string, - &(op->initstring), &fakehost, &(op->issue), - &(op->login), &ts); + opt_complementary = "-2:t+"; /* at least 2 args; -t N */ + op->flags = getopt32(argv, opt_string, + &(op->initstring), fakehost_p, &(op->issue), + &(op->login), &op->timeout); + argv += optind; if (op->flags & F_INITSTRING) { const char *p = op->initstring; char *q; - q = op->initstring = xstrdup(op->initstring); + op->initstring = q = xstrdup(p); /* copy optarg into op->initstring decoding \ddd octal codes into chars */ while (*p) { @@ -200,138 +200,72 @@ } *q = '\0'; } - op->flags ^= F_ISSUE; /* revert flag show /etc/issue */ - if (op->flags & F_TIMEOUT) { - op->timeout = xatoul_range(ts, 1, INT_MAX); - } - argv += optind; - argc -= optind; - debug("after getopt loop\n"); - if (argc < 2) /* check parameter count */ - bb_show_usage(); + op->flags ^= F_ISSUE; /* invert flag "show /etc/issue" */ + debug("after getopt\n"); /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */ + op->tty = argv[0]; /* tty name */ + ts = argv[1]; /* baud rate(s) */ if (isdigit(argv[0][0])) { /* a number first, assume it's a speed (BSD style) */ - parse_speeds(op, argv[0]); /* baud rate(s) */ - op->tty = argv[1]; /* tty name */ - } else { - op->tty = argv[0]; /* tty name */ - parse_speeds(op, argv[1]); /* baud rate(s) */ + op->tty = ts; /* tty name is in argv[1] */ + ts = argv[0]; /* baud rate(s) */ } + parse_speeds(op, ts); - if (argv[2]) - setenv("TERM", argv[2], 1); +// TODO: if applet_name is set to "getty: TTY", bb_error_msg's get simpler! +// grep for "%s:" - debug("exiting parseargs\n"); -} + if (argv[2]) + xsetenv("TERM", argv[2]); -static void xdup2(int srcfd, int dstfd, const char *tty) -{ - if (dup2(srcfd, dstfd) == -1) - bb_perror_msg_and_die("%s: dup", tty); + debug("exiting parse_args\n"); } /* open_tty - set up tty as standard { input, output, error } */ -static void open_tty(char *tty, struct termios *tp, int local) +static void open_tty(const char *tty) { - int chdir_to_root = 0; - /* Set up new standard input, unless we are given an already opened port. */ - if (NOT_LONE_DASH(tty)) { - struct stat st; - int fd; +// struct stat st; +// int cur_dir_fd; +// int fd; /* Sanity checks... */ +// cur_dir_fd = xopen(".", O_DIRECTORY | O_NONBLOCK); +// xchdir("/dev"); +// xstat(tty, &st); +// if ((st.st_mode & S_IFMT) != S_IFCHR) +// bb_error_msg_and_die("%s: not a character device", tty); - xchdir("/dev"); - chdir_to_root = 1; - xstat(tty, &st); - if ((st.st_mode & S_IFMT) != S_IFCHR) - bb_error_msg_and_die("%s: not a character device", tty); + if (tty[0] != '/') + tty = xasprintf("/dev/%s", tty); /* will leak it */ /* Open the tty as standard input. */ - debug("open(2)\n"); - fd = xopen(tty, O_RDWR | O_NONBLOCK); - xdup2(fd, 0, tty); - while (fd > 2) close(fd--); + close(0); + /*fd =*/ xopen(tty, O_RDWR | O_NONBLOCK); /* uses fd 0 */ + +// /* Restore current directory */ +// fchdir(cur_dir_fd); + + /* Open the tty as standard input, continued */ +// xmove_fd(fd, 0); +// /* fd is >= cur_dir_fd, and cur_dir_fd gets closed too here: */ +// while (fd > 2) +// close(fd--); + + /* Set proper protections and ownership. */ + fchown(0, 0, 0); /* 0:0 */ + fchmod(0, 0620); /* crw--w---- */ } 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) - bb_error_msg_and_die("%s: not open for read/write", tty); + if ((fcntl(0, F_GETFL) & O_RDWR) != O_RDWR) + bb_error_msg_and_die("stdin is not open for read/write"); } - - /* Replace current standard output/error fd's with new ones */ - debug("duping\n"); - xdup2(0, 1, tty); - xdup2(0, 2, tty); - - /* - * 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, TCGETS, tp) < 0) - bb_perror_msg_and_die("%s: ioctl(TCGETS)", 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 -#warning Debian /dev/vcs[a]NN hack is deprecated and will be removed - { - /* tty to root.dialout 660 */ - struct group *gr; - int id; - - gr = getgrnam("dialout"); - id = gr ? 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; - - vcs = xstrdup(tty); - vcsa = xmalloc(strlen(tty) + 2); - 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 - if (NOT_LONE_DASH(tty)) { - chown(tty, 0, 0); /* 0:0 */ - chmod(tty, 0622); /* crw--w--w- */ - } -#endif - if (chdir_to_root) - xchdir("/"); } /* termios_init - initialize termios settings */ @@ -345,13 +279,12 @@ */ #ifdef __linux__ /* flush input and output queues, important for modems! */ - ioctl(0, TCFLSH, TCIOFLUSH); + ioctl(0, TCFLSH, TCIOFLUSH); /* tcflush(0, TCIOFLUSH)? - same */ #endif tp->c_cflag = CS8 | HUPCL | CREAD | speed; - if (op->flags & F_LOCAL) { + if (op->flags & F_LOCAL) tp->c_cflag |= CLOCAL; - } tp->c_iflag = tp->c_lflag = tp->c_line = 0; tp->c_oflag = OPOST | ONLCR; @@ -359,16 +292,12 @@ tp->c_cc[VTIME] = 0; /* Optionally enable hardware flow control */ - -#ifdef CRTSCTS +#ifdef CRTSCTS if (op->flags & F_RTSCTS) tp->c_cflag |= CRTSCTS; #endif - ioctl(0, TCSETS, tp); - - /* go to blocking input even in local mode */ - fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK); + tcsetattr_stdin_TCSANOW(tp); debug("term_io 2\n"); } @@ -401,26 +330,24 @@ * Use 7-bit characters, don't block if input queue is empty. Errors will * be dealt with later on. */ - 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 */ - ioctl(0, TCSETS, tp); + tp->c_cc[VMIN] = 0; /* don't block if queue empty */ + tcsetattr_stdin_TCSANOW(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. */ - sleep(1); - nread = read(0, buf, size_buf - 1); + nread = safe_read(STDIN_FILENO, buf, size_buf - 1); if (nread > 0) { buf[nread] = '\0'; for (bp = buf; bp < buf + nread; bp++) { - if (isascii(*bp) && isdigit(*bp)) { + if (isdigit(*bp)) { speed = bcode(bp); - if (speed) { + if (speed > 0) { tp->c_cflag &= ~CBAUD; tp->c_cflag |= speed; } @@ -428,27 +355,15 @@ } } } - /* Restore terminal settings. Errors will be dealt with later on. */ + /* Restore terminal settings. Errors will be dealt with later on. */ tp->c_iflag = iflag; tp->c_cc[VMIN] = vmin; - ioctl(0, TCSETS, tp); -} - -/* next_speed - select next baud rate */ -static void next_speed(struct termios *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]; - ioctl(0, TCSETS, tp); + tcsetattr_stdin_TCSANOW(tp); } - /* do_prompt - show login prompt, optionally preceded by /etc/issue contents */ -static void do_prompt(struct options *op, struct termios *tp) +static void do_prompt(struct options *op) { #ifdef ISSUE print_login_issue(op->issue, op->tty); @@ -457,9 +372,9 @@ } #ifdef HANDLE_ALLCAPS -/* caps_lock - string contains upper case without lower case */ +/* all_is_upcase - string contains upper case without lower case */ /* returns 1 if true, 0 if false */ -static int caps_lock(const char *s) +static int all_is_upcase(const char *s) { while (*s) if (islower(*s++)) @@ -468,65 +383,58 @@ } #endif -/* get_logname - get user name, establish parity, speed, erase, kill, eol */ -/* return NULL on failure, logname on success */ +/* get_logname - get user name, establish parity, speed, erase, kill, eol; + * return NULL on BREAK, logname on success */ static char *get_logname(char *logname, unsigned size_logname, - struct options *op, struct chardata *cp, struct termios *tp) + struct options *op, struct chardata *cp) { 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 const char erase[][3] = { /* backspace-space-backspace */ + static const char erase[][3] = {/* backspace-space-backspace */ "\010\040\010", /* space parity */ "\010\040\010", /* odd parity */ "\210\240\210", /* even parity */ - "\210\240\210", /* no parity */ + "\010\040\010", /* 8 bit no parity */ }; - /* Initialize kill, erase, parity etc. (also after switching speeds). */ - - *cp = init_chardata; + /* NB: *cp is pre-initialized with init_chardata */ /* Flush pending input (esp. after parsing or switching the baud rate). */ - sleep(1); - ioctl(0, TCFLSH, TCIFLUSH); + ioctl(0, TCFLSH, TCIFLUSH); /* tcflush(0, TCIOFLUSH)? - same */ /* Prompt for and read a login name. */ - logname[0] = '\0'; while (!logname[0]) { - /* Write issue file and prompt, with "parity" bit == 0. */ - - do_prompt(op, tp); + do_prompt(op); /* Read name, watch for break, parity, erase, kill, end-of-line. */ - bp = logname; cp->eol = '\0'; while (cp->eol == '\0') { /* Do not report trivial EINTR/EIO errors. */ - if (read(0, &c, 1) < 1) { + if (read(STDIN_FILENO, &c, 1) < 1) { if (errno == EINTR || errno == EIO) - exit(0); + exit(EXIT_SUCCESS); bb_perror_msg_and_die("%s: read", op->tty); } - /* Do BREAK handling elsewhere. */ + /* BREAK. If we have speeds to try, + * return NULL (will switch speeds and return here) */ if (c == '\0' && op->numspeed > 1) return NULL; /* Do parity bit handling. */ - ascval = c & 0177; - if (c != ascval) { /* "parity" bit on ? */ + if (!(op->flags & F_LOCAL) && (c & 0x80)) { /* "parity" bit on? */ bits = 1; mask = 1; - while (mask & 0177) { - if (mask & ascval) + while (mask & 0x7f) { + if (mask & c) bits++; /* count "1" bits */ mask <<= 1; } @@ -535,6 +443,7 @@ } /* Do erase, kill and end-of-line processing. */ + ascval = c & 0x7f; switch (ascval) { case CR: case NL: @@ -543,30 +452,34 @@ break; case BS: case DEL: +#ifdef ANCIENT_BS_KILL_CHARS case '#': +#endif cp->erase = ascval; /* set erase character */ if (bp > logname) { - write(1, erase[cp->parity], 3); + full_write(STDOUT_FILENO, erase[cp->parity], 3); bp--; } break; case CTL('U'): +#ifdef ANCIENT_BS_KILL_CHARS case '@': +#endif cp->kill = ascval; /* set kill character */ while (bp > logname) { - write(1, erase[cp->parity], 3); + full_write(STDOUT_FILENO, erase[cp->parity], 3); bp--; } break; case CTL('D'): - exit(0); + exit(EXIT_SUCCESS); default: if (!isascii(ascval) || !isprint(ascval)) { /* ignore garbage characters */ - } else if (bp - logname >= size_logname - 1) { + } else if ((int)(bp - logname) >= size_logname - 1) { bb_error_msg_and_die("%s: input overrun", op->tty); } else { - write(1, &c, 1); /* echo the character */ + full_write(STDOUT_FILENO, &c, 1); /* echo the character */ *bp++ = ascval; /* and store it */ } break; @@ -576,7 +489,7 @@ /* Handle names with upper case and no lower case. */ #ifdef HANDLE_ALLCAPS - cp->capslock = caps_lock(logname); + cp->capslock = all_is_upcase(logname); if (cp->capslock) { for (bp = logname; *bp; bp++) if (isupper(*bp)) @@ -590,7 +503,6 @@ static void termios_final(struct options *op, struct termios *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 */ @@ -603,7 +515,6 @@ 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 */ @@ -612,9 +523,9 @@ 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 */ +// I bet most people go here - they use only 7-bit chars in usernames.... break; case 1: /* odd parity */ tp->c_cflag |= PARODD; @@ -626,10 +537,13 @@ case (1 | 2): /* no parity bit */ tp->c_cflag &= ~CSIZE; tp->c_cflag |= CS7; +// FIXME: wtf? case 3: we saw both even and odd 8-bit bytes - +// it's probably some umlauts etc, but definitely NOT 7-bit!!! +// Entire parity detection madness here just begs for deletion... break; } - /* Account for upper case without lower case. */ + /* Account for upper case without lower case. */ #ifdef HANDLE_ALLCAPS if (cp->capslock) { tp->c_iflag |= IUCLC; @@ -638,29 +552,34 @@ } #endif /* Optionally enable hardware flow control */ - -#ifdef CRTSCTS +#ifdef CRTSCTS if (op->flags & F_RTSCTS) tp->c_cflag |= CRTSCTS; #endif /* Finally, make the new settings effective */ - - if (ioctl(0, TCSETS, tp) < 0) - bb_perror_msg_and_die("%s: ioctl(TCSETS)", op->tty); + /* It's tcsetattr_stdin_TCSANOW() + error check */ + ioctl_or_perror_and_die(0, TCSETS, tp, "%s: TCSETS", op->tty); } - -#ifdef SYSV_STYLE #if ENABLE_FEATURE_UTMP +static void touch(const char *filename) +{ + if (access(filename, R_OK | W_OK) == -1) + close(open(filename, O_WRONLY | O_CREAT, 0664)); +} + /* update_utmp - update our utmp entry */ -static void update_utmp(char *line) +static void update_utmp(const char *line, char *fakehost) { struct utmp ut; struct utmp *utp; - time_t t; int mypid = getpid(); + /* In case we won't find an entry below... */ + memset(&ut, 0, sizeof(ut)); + safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id)); + /* * The utmp file holds miscellaneous information about things started by * /sbin/init and other system-related events. Our purpose is to update @@ -669,30 +588,22 @@ * 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)); - } + touch(_PATH_UTMP); + 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)); - safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id)); + while ((utp = getutent()) != NULL) { + if (utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid) { + memcpy(&ut, utp, sizeof(ut)); + break; + } } - /* endutent(); */ strcpy(ut.ut_user, "LOGIN"); safe_strncpy(ut.ut_line, line, sizeof(ut.ut_line)); if (fakehost) safe_strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host)); - time(&t); - ut.ut_time = t; + ut.ut_tv.tv_sec = time(NULL); ut.ut_type = LOGIN_PROCESS; ut.ut_pid = mypid; @@ -700,155 +611,167 @@ endutent(); #if ENABLE_FEATURE_WTMP - if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) - close(creat(bb_path_wtmp_file, 0664)); + touch(bb_path_wtmp_file); updwtmp(bb_path_wtmp_file, &ut); #endif } - #endif /* CONFIG_FEATURE_UTMP */ -#endif /* SYSV_STYLE */ - -int getty_main(int argc, char **argv) +int getty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int getty_main(int argc UNUSED_PARAM, char **argv) { - int nullfd; - char *logname = NULL; /* login name, given to /bin/login */ + int n; + char *fakehost = NULL; /* Fake hostname for ut_host */ + char *logname; /* login name, given to /bin/login */ /* Merging these into "struct local" may _seem_ to reduce * parameter passing, but today's gcc will inline * statics which are called once anyway, so don't do that */ struct chardata chardata; /* set by get_logname() */ - struct termios termios; /* terminal mode bits */ - struct options options = { - 0, /* show /etc/issue (SYSV_STYLE) */ - 0, /* no timeout */ - _PATH_LOGIN, /* default login program */ - "tty1", /* default tty line */ - "", /* modem init string */ + struct termios termios; /* terminal mode bits */ + struct options options; + + chardata = init_chardata; + + memset(&options, 0, sizeof(options)); + options.login = _PATH_LOGIN; /* default login program */ + options.tty = "tty1"; /* default tty line */ + options.initstring = ""; /* modem init string */ #ifdef ISSUE - ISSUE, /* default issue file */ -#else - NULL, + options.issue = ISSUE; /* default issue file */ #endif - 0, /* no baud rates known yet */ - }; - /* Already too late because of theoretical - * possibility of getty --help somehow triggered - * inadvertently before we reach this. Oh well. */ + /* Parse command-line arguments. */ + parse_args(argv, &options, &fakehost); + logmode = LOGMODE_NONE; + + /* Create new session, lose controlling tty, if any */ + /* docs/ctty.htm says: + * "This is allowed only when the current process + * is not a process group leader" - is this a problem? */ setsid(); - nullfd = xopen(bb_dev_null, O_RDWR); - /* dup2(nullfd, 0); - no, because of possible "getty - 9600" */ - /* open_tty() will take care of fd# 0 anyway */ - dup2(nullfd, 1); - dup2(nullfd, 2); - while (nullfd > 2) close(nullfd--); - /* We want special flavor of error_msg_and_die */ + /* close stdio, and stray descriptors, just in case */ + n = xopen(bb_dev_null, O_RDWR); + /* dup2(n, 0); - no, we need to handle "getty - 9600" too */ + xdup2(n, 1); + xdup2(n, 2); + while (n > 2) + close(n--); + + /* Logging. We want special flavor of error_msg_and_die */ die_sleep = 10; msg_eol = "\r\n"; + /* most likely will internally use fd #3 in CLOEXEC mode: */ openlog(applet_name, LOG_PID, LOG_AUTH); logmode = LOGMODE_BOTH; #ifdef DEBUGGING - dbf = xfopen(DEBUGTERM, "w"); - - { - int i; - - for (i = 1; i < argc; i++) { - debug(argv[i]); - debug("\n"); - } + dbf = xfopen_for_write(DEBUGTERM); + for (n = 1; argv[n]; n++) { + debug(argv[n]); + debug("\n"); } #endif - /* Parse command-line arguments. */ - parse_args(argc, argv, &options); - -#ifdef SYSV_STYLE -#if ENABLE_FEATURE_UTMP - /* Update the utmp file. */ - update_utmp(options.tty); -#endif -#endif - + /* Open the tty as standard input, if it is not "-" */ + /* If it's not "-" and not taken yet, it will become our ctty */ debug("calling open_tty\n"); - /* Open the tty as standard { input, output, error }. */ - open_tty(options.tty, &termios, options.flags & F_LOCAL); + open_tty(options.tty); + ndelay_off(0); + debug("duping\n"); + xdup2(0, 1); + xdup2(0, 2); + + /* + * 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. + */ + /* tcgetattr() + error check */ + ioctl_or_perror_and_die(0, TCGETS, &termios, "%s: TCGETS", options.tty); #ifdef __linux__ - { - int iv; +// FIXME: do we need this? Otherwise "-" case seems to be broken... + // /* Forcibly make fd 0 our controlling tty, even if another session + // * has it as a ctty. (Another session loses ctty). */ + // ioctl(0, TIOCSCTTY, (void*)1); + /* Make ourself a foreground process group within our session */ + tcsetpgrp(0, getpid()); +#endif - iv = getpid(); - ioctl(0, TIOCSPGRP, &iv); - } +#if ENABLE_FEATURE_UTMP + /* Update the utmp file. This tty is ours now! */ + update_utmp(options.tty, fakehost); #endif + /* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */ debug("calling termios_init\n"); - termios_init(&termios, options.speeds[FIRST_SPEED], &options); + termios_init(&termios, options.speeds[0], &options); - /* write the modem init string and DON'T flush the buffers */ + /* 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); + full_write(STDOUT_FILENO, options.initstring, strlen(options.initstring)); } - /* Optionally detect the baud rate from the modem status message. */ + /* Optionally detect the baud rate from the modem status message */ debug("before autobaud\n"); if (options.flags & F_PARSE) - auto_baud(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), &termios); + auto_baud(line_buf, sizeof(line_buf), &termios); - /* Set the optional timer. */ - if (options.timeout) - alarm(options.timeout); + /* Set the optional timer */ + alarm(options.timeout); /* if 0, alarm is not set */ - /* optionally wait for CR or LF before writing /etc/issue */ + /* 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) { + while (safe_read(STDIN_FILENO, &ch, 1) == 1) { + debug("read %x\n", (unsigned char)ch); ch &= 0x7f; /* strip "parity bit" */ -#ifdef DEBUGGING - fprintf(dbf, "read %c\n", ch); -#endif if (ch == '\n' || ch == '\r') break; } } - chardata = init_chardata; + logname = NULL; if (!(options.flags & F_NOPROMPT)) { - /* Read the login name. */ - debug("reading login name\n"); - logname = get_logname(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), - &options, &chardata, &termios); - while (logname == NULL) - next_speed(&termios, &options); + /* NB:termios_init already set line speed + * to options.speeds[0] */ + int baud_index = 0; + + while (1) { + /* Read the login name. */ + debug("reading login name\n"); + logname = get_logname(line_buf, sizeof(line_buf), + &options, &chardata); + if (logname) + break; + /* we are here only if options.numspeed > 1 */ + baud_index = (baud_index + 1) % options.numspeed; + termios.c_cflag &= ~CBAUD; + termios.c_cflag |= options.speeds[baud_index]; + tcsetattr_stdin_TCSANOW(&termios); + } } /* Disable timer. */ - - if (options.timeout) - alarm(0); + alarm(0); /* Finalize the termios settings. */ - termios_final(&options, &termios, &chardata); /* Now the newline character should be properly written. */ - - write(1, "\n", 1); + full_write(STDOUT_FILENO, "\n", 1); /* Let the login program take care of password validation. */ - - execl(options.login, options.login, "--", logname, (char *) 0); + /* We use PATH because we trust that root doesn't set "bad" PATH, + * and getty is not suid-root applet. */ + /* With -n, logname == NULL, and login will ask for username instead */ + BB_EXECLP(options.login, options.login, "--", logname, NULL); bb_error_msg_and_die("%s: can't exec %s", options.tty, options.login); }