/* * Alternate Getty (agetty) 'agetty' is a versatile, portable, easy to use * replacement for getty on SunOS 4.1.x or the SAC ttymon/ttyadm/sacadm/pmadm * suite on Solaris and other SVR4 systems. 'agetty' was written by Wietse * Venema, enhanced by John DiMarco, and further enhanced by Dennis Cronin. * * Ported to Linux by Peter Orbaek * Adopt the mingetty features for a better support * of virtual consoles by Werner Fink * * This program is freely distributable. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "strutils.h" #include "all-io.h" #include "nls.h" #include "pathnames.h" #include "c.h" #include "widechar.h" #include "ttyutils.h" #ifdef __linux__ # include # include # define USE_SYSLOG # ifndef DEFAULT_VCTERM # define DEFAULT_VCTERM "linux" # endif # ifndef DEFAULT_STERM # define DEFAULT_STERM "vt102" # endif #elif defined(__GNU__) # define USE_SYSLOG # ifndef DEFAULT_VCTERM # define DEFAULT_VCTERM "hurd" # endif # ifndef DEFAULT_STERM # define DEFAULT_STERM "vt102" # endif #else # ifndef DEFAULT_VCTERM # define DEFAULT_VCTERM "vt100" # endif # ifndef DEFAULT_STERM # define DEFAULT_STERM "vt100" # endif #endif /* If USE_SYSLOG is undefined all diagnostics go to /dev/console. */ #ifdef USE_SYSLOG # include #endif /* * Some heuristics to find out what environment we are in: if it is not * System V, assume it is SunOS 4. The LOGIN_PROCESS is defined in System V * utmp.h, which will select System V style getty. */ #ifdef LOGIN_PROCESS # define SYSV_STYLE #endif /* * 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. */ /* Displayed before the login prompt. */ #ifdef SYSV_STYLE # define ISSUE _PATH_ISSUE # include #endif /* Login prompt. */ #define LOGIN "login: " #define LOGIN_ARGV_MAX 16 /* Numbers of args for login */ /* 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 these. */ #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 0 #define DEF_SWITCH 0 /* default switch char */ /* * 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 *autolog; /* login the user automatically */ char *chdir; /* Chdir before the login */ char *chroot; /* Chroot before the login */ char *login; /* login program */ char *logopt; /* options for login program */ char *tty; /* name of tty */ char *vcline; /* line of virtual console */ char *term; /* terminal type */ char *initstring; /* modem init string */ char *issue; /* alternative issue file */ int delay; /* Sleep seconds before prompt */ int nice; /* Run login with this priority */ int numspeed; /* number of baud rates to try */ speed_t 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) /* do not ask for login name! */ #define F_LCUC (1<<8) /* support for *LCUC stty modes */ #define F_KEEPSPEED (1<<9) /* follow baud rate from kernel */ #define F_KEEPCFLAGS (1<<10) /* reuse c_cflags setup from kernel */ #define F_EIGHTBITS (1<<11) /* Assume 8bit-clean tty */ #define F_VCONSOLE (1<<12) /* This is a virtual console */ #define F_HANGUP (1<<13) /* Do call vhangup(2) */ #define F_UTF8 (1<<14) /* We can do UTF8 */ #define F_LOGINPAUSE (1<<15) /* Wait for any key before dropping login prompt */ #define F_NOCLEAR (1<<16) /* Do not clear the screen before prompting */ #define F_NONL (1<<17) /* No newline before issue */ #define F_NOHOSTNAME (1<<18) /* Do not show the hostname */ #define F_LONGHNAME (1<<19) /* Show Full qualified hostname */ #define F_NOHINTS (1<<20) /* Don't print hints */ #define F_REMOTE (1<<21) /* Add '-h fakehost' to login(1) command line */ #define serial_tty_option(opt, flag) \ (((opt)->flags & (F_VCONSOLE|(flag))) == (flag)) /* Storage for things detected while the login name was read. */ 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 const struct chardata init_chardata = { DEF_ERASE, /* default erase character */ DEF_KILL, /* default kill character */ 13, /* default eol char */ 0, /* space parity */ 0, /* no capslock */ }; struct Speedtab { long speed; speed_t code; }; static const 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}, }; static void init_special_char(char* arg, struct options *op); static void parse_args(int argc, char **argv, struct options *op); static void parse_speeds(struct options *op, char *arg); static void update_utmp(struct options *op); static void open_tty(char *tty, struct termios *tp, struct options *op); static void termio_init(struct options *op, struct termios *tp); static void reset_vc (const struct options *op, struct termios *tp); static void auto_baud(struct termios *tp); static void output_special_char (unsigned char c, struct options *op, struct termios *tp); static void do_prompt(struct options *op, struct termios *tp); static void next_speed(struct options *op, struct termios *tp); static char *get_logname(struct options *op, struct termios *tp, struct chardata *cp); static void termio_final(struct options *op, struct termios *tp, struct chardata *cp); static int caps_lock(char *s); static speed_t bcode(char *s); static void usage(FILE * out) __attribute__((__noreturn__)); static void log_err(const char *, ...) __attribute__((__noreturn__)) __attribute__((__format__(printf, 1, 2))); static void log_warn (const char *, ...) __attribute__((__format__(printf, 1, 2))); static ssize_t append(char *dest, size_t len, const char *sep, const char *src); static void check_username (const char* nm); static void login_options_to_argv(char *argv[], int *argc, char *str, char *username); /* Fake hostname for ut_host specified on command line. */ static char *fakehost; #ifdef DEBUGGING #define debug(s) fprintf(dbf,s); fflush(dbf) FILE *dbf; #else #define debug(s) #endif /* DEBUGGING */ int main(int argc, char **argv) { char *username = NULL; /* login name, given to /bin/login */ struct chardata chardata; /* will be set by get_logname() */ struct termios termios; /* terminal mode bits */ struct options options = { .flags = F_ISSUE, /* show /etc/issue (SYSV_STYLE) */ .login = _PATH_LOGIN, /* default login program */ .tty = "tty1", /* default tty line */ .term = DEFAULT_VCTERM, /* terminal type */ .issue = ISSUE /* default issue file */ }; char *login_argv[LOGIN_ARGV_MAX + 1]; int login_argc = 0; struct sigaction sa, sa_hup, sa_quit, sa_int; sigset_t set; setlocale(LC_ALL, ""); bindtextdomain(PACKAGE, LOCALEDIR); textdomain(PACKAGE); /* In case vhangup(2) has to called */ sa.sa_handler = SIG_IGN; sa.sa_flags = SA_RESTART; sigemptyset (&sa.sa_mask); sigaction(SIGHUP, &sa, &sa_hup); sigaction(SIGQUIT, &sa, &sa_quit); sigaction(SIGINT, &sa, &sa_int); #ifdef DEBUGGING dbf = fopen("/dev/ttyp0", "w"); for (int i = 1; i < argc; i++) debug(argv[i]); #endif /* DEBUGGING */ /* Parse command-line arguments. */ parse_args(argc, argv, &options); login_argv[login_argc++] = options.login; /* set login program name */ /* Update the utmp file. */ #ifdef SYSV_STYLE update_utmp(&options); #endif if (options.delay) sleep(options.delay); debug("calling open_tty\n"); /* Open the tty as standard { input, output, error }. */ open_tty(options.tty, &termios, &options); /* Unmask SIGHUP if inherited */ sigemptyset(&set); sigaddset(&set, SIGHUP); sigprocmask(SIG_UNBLOCK, &set, NULL); sigaction(SIGHUP, &sa_hup, NULL); tcsetpgrp(STDIN_FILENO, getpid()); /* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */ debug("calling termio_init\n"); termio_init(&options, &termios); /* Write the modem init string and DO NOT flush the buffers. */ if (serial_tty_option(&options, F_INITSTRING) && options.initstring && *options.initstring != '\0') { debug("writing init string\n"); write_all(STDOUT_FILENO, options.initstring, strlen(options.initstring)); } if (!serial_tty_option(&options, F_LOCAL)) /* Go to blocking write mode unless -L is specified. */ fcntl(STDOUT_FILENO, F_SETFL, fcntl(STDOUT_FILENO, F_GETFL, 0) & ~O_NONBLOCK); /* Optionally detect the baud rate from the modem status message. */ debug("before autobaud\n"); if (serial_tty_option(&options, F_PARSE)) auto_baud(&termios); /* Set the optional timer. */ if (options.timeout) alarm((unsigned) options.timeout); /* Optionally wait for CR or LF before writing /etc/issue */ if (serial_tty_option(&options, F_WAITCRLF)) { char ch; debug("waiting for cr-lf\n"); while (read(STDIN_FILENO, &ch, 1) == 1) { /* Strip "parity bit". */ ch &= 0x7f; #ifdef DEBUGGING fprintf(dbf, "read %c\n", ch); #endif if (ch == '\n' || ch == '\r') break; } } chardata = init_chardata; if ((options.flags & F_NOPROMPT) == 0) { if (options.autolog) { /* Do the auto login. */ debug("doing auto login\n"); do_prompt(&options, &termios); printf("%s%s (automatic login)\n", LOGIN, options.autolog); username = options.autolog; } else { /* Read the login name. */ debug("reading login name\n"); while ((username = get_logname(&options, &termios, &chardata)) == 0) if ((options.flags & F_VCONSOLE) == 0) next_speed(&options, &termios); } } /* Disable timer. */ if (options.timeout) alarm(0); if ((options.flags & F_VCONSOLE) == 0) { /* Finalize the termios settings. */ termio_final(&options, &termios, &chardata); /* Now the newline character should be properly written. */ write_all(STDOUT_FILENO, "\r\n", 2); } sigaction(SIGQUIT, &sa_quit, NULL); sigaction(SIGINT, &sa_int, NULL); if (username) check_username(username); if (options.logopt) { /* * The --login-options completely overwrites the default * way how agetty composes login(1) command line. */ login_options_to_argv(login_argv, &login_argc, options.logopt, username); } else { if (fakehost && (options.flags & F_REMOTE)) { login_argv[login_argc++] = "-h"; login_argv[login_argc++] = fakehost; } if (username) { if (options.autolog) login_argv[login_argc++] = "-f"; else login_argv[login_argc++] = "--"; login_argv[login_argc++] = username; } } login_argv[login_argc] = NULL; /* last login argv */ if (options.chroot) { if (chroot(options.chroot) < 0) log_err(_("%s: can't change root directory %s: %m"), options.tty, options.chroot); } if (options.chdir) { if (chdir(options.chdir) < 0) log_err(_("%s: can't change working directory %s: %m"), options.tty, options.chdir); } if (options.nice) { if (nice(options.nice) < 0) log_warn(_("%s: can't change process priority: %m"), options.tty); } /* Let the login program take care of password validation. */ execv(options.login, login_argv); log_err(_("%s: can't exec %s: %m"), options.tty, login_argv[0]); } /* * Returns : @str if \u not found * : @username if @str equal to "\u" * : newly allocated string if \u mixed with something other */ static char *replace_u(char *str, char *username) { char *entry = NULL, *p = str; size_t usz = username ? strlen(username) : 0; while (*p) { size_t sz; char *tp, *old = entry; if (memcmp(p, "\\u", 2)) { p++; continue; /* no \u */ } sz = strlen(str); if (p == str && sz == 2) /* 'str' contains only '\u' */ return username; tp = entry = malloc(sz + usz); if (!tp) log_err(_("failed to allocate memory: %m")); if (p != str) { /* copy chars befor \u */ memcpy(tp, str, p - str); tp += p - str; } if (usz) { /* copy username */ memcpy(tp, username, usz); tp += usz; } if (*(p + 2)) /* copy chars after \u + \0 */ memcpy(tp, p + 2, sz - (p - str) - 1); else *tp = '\0'; p = tp; str = entry; free(old); } return entry ? entry : str; } static void login_options_to_argv(char *argv[], int *argc, char *str, char *username) { char *p; int i = *argc; while (str && isspace(*str)) str++; p = str; while (p && *p && i < LOGIN_ARGV_MAX) { if (isspace(*p)) { *p = '\0'; while (isspace(*++p)) ; if (*p) { argv[i++] = replace_u(str, username); str = p; } } else p++; } if (str && *str && i < LOGIN_ARGV_MAX) argv[i++] = replace_u(str, username); *argc = i; } /* Parse command-line arguments. */ static void parse_args(int argc, char **argv, struct options *op) { int c; enum { VERSION_OPTION = CHAR_MAX + 1, NOHINTS_OPTION, NOHOSTNAME_OPTION, LONGHOSTNAME_OPTION, HELP_OPTION }; const struct option longopts[] = { { "8bits", no_argument, 0, '8' }, { "autologin", required_argument, 0, 'a' }, { "noreset", no_argument, 0, 'c' }, { "chdir", required_argument, 0, 'C' }, { "delay", required_argument, 0, 'd' }, { "remote", no_argument, 0, 'E' }, { "issue-file", required_argument, 0, 'f' }, { "flow-control", no_argument, 0, 'h' }, { "host", required_argument, 0, 'H' }, { "noissue", no_argument, 0, 'i' }, { "init-string", required_argument, 0, 'I' }, { "noclear", no_argument, 0, 'J' }, { "login-program", required_argument, 0, 'l' }, { "local-line", no_argument, 0, 'L' }, { "extract-baud", no_argument, 0, 'm' }, { "skip-login", no_argument, 0, 'n' }, { "nonewline", no_argument, 0, 'N' }, { "login-options", required_argument, 0, 'o' }, { "login-pause", no_argument, 0, 'p' }, { "nice", required_argument, 0, 'P' }, { "chroot", required_argument, 0, 'r' }, { "hangup", no_argument, 0, 'R' }, { "keep-baud", no_argument, 0, 's' }, { "timeout", required_argument, 0, 't' }, { "detect-case", no_argument, 0, 'U' }, { "wait-cr", no_argument, 0, 'w' }, { "nohints", no_argument, 0, NOHINTS_OPTION }, { "nohostname", no_argument, 0, NOHOSTNAME_OPTION }, { "long-hostname", no_argument, 0, LONGHOSTNAME_OPTION }, { "version", no_argument, 0, VERSION_OPTION }, { "help", no_argument, 0, HELP_OPTION }, { NULL, 0, 0, 0 } }; while ((c = getopt_long(argc, argv, "8a:cC:d:Ef:hH:iI:Jl:LmnNo:pP:r:Rst:Uw", longopts, NULL)) != -1) { switch (c) { case '8': op->flags |= F_EIGHTBITS; break; case 'a': op->autolog = optarg; break; case 'c': op->flags |= F_KEEPCFLAGS; break; case 'C': op->chdir = optarg; break; case 'd': op->delay = atoi(optarg); break; case 'E': op->flags |= F_REMOTE; break; case 'f': op->flags |= F_CUSTISSUE; op->issue = optarg; break; case 'h': op->flags |= F_RTSCTS; break; case 'H': fakehost = optarg; break; case 'i': op->flags &= ~F_ISSUE; break; case 'I': init_special_char(optarg, op); op->flags |= F_INITSTRING; break; case 'J': op->flags |= F_NOCLEAR; break; case 'l': op->login = optarg; break; case 'L': op->flags |= F_LOCAL; break; case 'm': op->flags |= F_PARSE; break; case 'n': op->flags |= F_NOPROMPT; break; case 'o': op->logopt = optarg; break; case 'p': op->flags |= F_LOGINPAUSE; break; case 'P': op->nice = atoi(optarg); break; case 'r': op->chroot = optarg; break; case 'R': op->flags |= F_HANGUP; break; case 's': op->flags |= F_KEEPSPEED; break; case 't': if ((op->timeout = atoi(optarg)) <= 0) log_err(_("bad timeout value: %s"), optarg); break; case 'U': op->flags |= F_LCUC; break; case 'w': op->flags |= F_WAITCRLF; break; case NOHINTS_OPTION: op->flags |= F_NOHINTS; break; case NOHOSTNAME_OPTION: op->flags |= F_NOHOSTNAME; break; case LONGHOSTNAME_OPTION: op->flags |= F_LONGHNAME; break; case VERSION_OPTION: printf(_("%s from %s\n"), program_invocation_short_name, PACKAGE_STRING); exit(EXIT_SUCCESS); case HELP_OPTION: usage(stdout); default: usage(stderr); } } debug("after getopt loop\n"); if (argc < optind + 1) { log_warn(_("not enough arguments")); usage(stderr); } /* Accept "tty", "baudrate tty", and "tty baudrate". */ if ('0' <= argv[optind][0] && argv[optind][0] <= '9') { /* Assume BSD style speed. */ parse_speeds(op, argv[optind++]); if (argc < optind + 1) { warn(_("not enough arguments")); usage(stderr); } op->tty = argv[optind++]; } else { op->tty = argv[optind++]; if (argc > optind) { char *v = argv[optind++]; if ('0' <= *v && *v <= '9') parse_speeds(op, v); else op->speeds[op->numspeed++] = bcode("9600"); } } /* On virtual console remember the line which is used for */ if (strncmp(op->tty, "tty", 3) == 0 && strspn(op->tty + 3, "0123456789") == strlen(op->tty+3)) op->vcline = op->tty+3; if (argc > optind && argv[optind]) op->term = argv[optind]; #ifdef DO_DEVFS_FIDDLING /* * Some devfs junk, following Goswin Brederlow: * turn ttyS into tts/ * turn tty into vc/ * http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=72241 */ if (op->tty && strlen(op->tty) < 90) { char dev_name[100]; struct stat st; if (strncmp(op->tty, "ttyS", 4) == 0) { strcpy(dev_name, "/dev/"); strcat(dev_name, op->tty); if (stat(dev_name, &st) < 0) { strcpy(dev_name, "/dev/tts/"); strcat(dev_name, op->tty + 4); if (stat(dev_name, &st) == 0) { op->tty = strdup(dev_name + 5); if (!op->tty) log_err(_("failed to allocate memory: %m")); } } } else if (strncmp(op->tty, "tty", 3) == 0) { strcpy(dev_name, "/dev/"); strncat(dev_name, op->tty, 90); if (stat(dev_name, &st) < 0) { strcpy(dev_name, "/dev/vc/"); strcat(dev_name, op->tty + 3); if (stat(dev_name, &st) == 0) { op->tty = strdup(dev_name + 5); if (!op->tty) log_err(_("failed to allocate memory: %m")); } } } } #endif /* DO_DEVFS_FIDDLING */ debug("exiting parseargs\n"); } /* 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) log_err(_("bad speed: %s"), cp); if (op->numspeed >= MAX_SPEED) log_err(_("too many alternate speeds")); } debug("exiting parsespeeds\n"); } #ifdef SYSV_STYLE /* Update our utmp entry. */ static void update_utmp(struct options *op) { struct utmp ut; time_t t; pid_t pid = getpid(); pid_t sid = getsid(0); char *vcline = op->vcline; char *line = op->tty; struct utmp *utp; /* * 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. */ utmpname(_PATH_UTMP); setutent(); /* * Find my pid in utmp. * * FIXME: Earlier (when was that?) code here tested only utp->ut_type != * INIT_PROCESS, so maybe the >= here should be >. * * FIXME: The present code is taken from login.c, so if this is changed, * maybe login has to be changed as well (is this true?). */ while ((utp = getutent())) if (utp->ut_pid == pid && utp->ut_type >= INIT_PROCESS && utp->ut_type <= DEAD_PROCESS) break; if (utp) { memcpy(&ut, utp, sizeof(ut)); } else { /* Some inits do not initialize utmp. */ memset(&ut, 0, sizeof(ut)); if (vcline && *vcline) /* Standard virtual console devices */ strncpy(ut.ut_id, vcline, sizeof(ut.ut_id)); else { size_t len = strlen(line); char * ptr; if (len >= sizeof(ut.ut_id)) ptr = line + len - sizeof(ut.ut_id); else ptr = line; strncpy(ut.ut_id, ptr, sizeof(ut.ut_id)); } } 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 = pid; ut.ut_session = sid; pututline(&ut); endutent(); { #ifdef HAVE_UPDWTMP updwtmp(_PATH_WTMP, &ut); #else int ut_fd; int lf; if ((lf = open(_PATH_WTMPLOCK, O_CREAT | O_WRONLY, 0660)) >= 0) { flock(lf, LOCK_EX); if ((ut_fd = open(_PATH_WTMP, O_APPEND | O_WRONLY)) >= 0) { write_all(ut_fd, &ut, sizeof(ut)); close(ut_fd); } flock(lf, LOCK_UN); close(lf); } #endif /* HAVE_UPDWTMP */ } } #endif /* SYSV_STYLE */ /* Set up tty as stdin, stdout & stderr. */ static void open_tty(char *tty, struct termios *tp, struct options *op) { const pid_t pid = getpid(); int serial; /* Set up new standard input, unless we are given an already opened port. */ if (strcmp(tty, "-") != 0) { char buf[PATH_MAX+1]; struct group *gr = NULL; struct stat st; int fd, len; pid_t tid; gid_t gid = 0; /* Use tty group if available */ if ((gr = getgrnam("tty"))) gid = gr->gr_gid; if (((len = snprintf(buf, sizeof(buf), "/dev/%s", tty)) >= (int)sizeof(buf)) || (len < 0)) log_err(_("/dev/%s: cannot open as standard input: %m"), tty); /* * There is always a race between this reset and the call to * vhangup() that s.o. can use to get access to your tty. * Linux login(1) will change tty permissions. Use root owner and group * with permission -rw------- for the period between getty and login. */ if (chown(buf, 0, gid) || chmod(buf, (gid ? 0660 : 0600))) { if (errno == EROFS) log_warn("%s: %m", buf); else log_err("%s: %m", buf); } /* Open the tty as standard input. */ if ((fd = open(buf, O_RDWR|O_NOCTTY|O_NONBLOCK, 0)) < 0) log_err(_("/dev/%s: cannot open as standard input: %m"), tty); /* Sanity checks... */ if (!isatty(fd)) log_err(_("/dev/%s: not a character device"), tty); if (fstat(fd, &st) < 0) log_err("%s: %m", buf); if ((st.st_mode & S_IFMT) != S_IFCHR) log_err(_("/dev/%s: not a character device"), tty); if (((tid = tcgetsid(fd)) < 0) || (pid != tid)) { if (ioctl(fd, TIOCSCTTY, 1) == -1) log_warn("/dev/%s: cannot get controlling tty: %m", tty); } if (op->flags & F_HANGUP) { /* * vhangup() will replace all open file descriptors in the kernel * that point to our controlling tty by a dummy that will deny * further reading/writing to our device. It will also reset the * tty to sane defaults, so we don't have to modify the tty device * for sane settings. We also get a SIGHUP/SIGCONT. */ if (vhangup()) log_err("/dev/%s: vhangup() failed: %m", tty); ioctl(fd, TIOCNOTTY); } close(fd); close(STDIN_FILENO); errno = 0; debug("open(2)\n"); if (open(buf, O_RDWR|O_NOCTTY|O_NONBLOCK, 0) != 0) log_err(_("/dev/%s: cannot open as standard input: %m"), tty); if (((tid = tcgetsid(STDIN_FILENO)) < 0) || (pid != tid)) { if (ioctl(STDIN_FILENO, TIOCSCTTY, 1) == -1) log_warn("/dev/%s: cannot get controlling tty: %m", tty); } } else { /* * Standard input should already be connected to an open port. Make * sure it is open for read/write. */ if ((fcntl(STDIN_FILENO, F_GETFL, 0) & O_RDWR) != O_RDWR) log_err(_("%s: not open for read/write"), tty); } if (tcsetpgrp(STDIN_FILENO, pid)) log_err("/dev/%s: cannot set process group: %m", tty); /* Get rid of the present outputs. */ close(STDOUT_FILENO); close(STDERR_FILENO); errno = 0; /* Set up standard output and standard error file descriptors. */ debug("duping\n"); /* set up stdout and stderr */ if (dup(STDIN_FILENO) != 1 || dup(STDIN_FILENO) != 2) log_err(_("%s: dup problem: %m"), tty); /* make stdio unbuffered for slow modem lines */ setvbuf(stdout, NULL, _IONBF, 0); /* * 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. * http://www.sunmanagers.org/archives/1993/0574.html */ memset(tp, 0, sizeof(struct termios)); if (tcgetattr(STDIN_FILENO, tp) < 0) log_err("%s: tcgetattr: %m", tty); /* * Detect if this is a virtual console or serial/modem line. * In case of a virtual console the ioctl TIOCMGET fails and * the error number will be set to EINVAL. */ if (ioctl(STDIN_FILENO, TIOCMGET, &serial) < 0 && (errno == EINVAL)) { op->flags |= F_VCONSOLE; if (!op->term) op->term = DEFAULT_VCTERM; } else if (!op->term) op->term = DEFAULT_STERM; setenv("TERM", op->term, 1); } /* Initialize termios settings. */ static void termio_init(struct options *op, struct termios *tp) { speed_t ispeed, ospeed; struct winsize ws; if (op->flags & F_VCONSOLE) { #if defined(IUTF8) && defined(KDGKBMODE) int mode; /* Detect mode of current keyboard setup, e.g. for UTF-8 */ if (ioctl(STDIN_FILENO, KDGKBMODE, &mode) < 0) mode = K_RAW; switch(mode) { case K_UNICODE: setlocale(LC_CTYPE, "C.UTF-8"); op->flags |= F_UTF8; break; case K_RAW: case K_MEDIUMRAW: case K_XLATE: default: setlocale(LC_CTYPE, "POSIX"); op->flags &= ~F_UTF8; break; } #else setlocale(LC_CTYPE, "POSIX"); op->flags &= ~F_UTF8; #endif reset_vc(op, tp); if ((tp->c_cflag & (CS8|PARODD|PARENB)) == CS8) op->flags |= F_EIGHTBITS; if ((op->flags & F_NOCLEAR) == 0) { /* * Do not write a full reset (ESC c) because this destroys * the unicode mode again if the terminal was in unicode * mode. Also it clears the CONSOLE_MAGIC features which * are required for some languages/console-fonts. * Just put the cursor to the home position (ESC [ H), * erase everything below the cursor (ESC [ J), and set the * scrolling region to the full window (ESC [ r) */ write_all(STDOUT_FILENO, "\033[r\033[H\033[J", 9); } return; } if (op->flags & F_KEEPSPEED) { /* Save the original setting. */ ispeed = cfgetispeed(tp); ospeed = cfgetospeed(tp); if (!ispeed) ispeed = TTYDEF_SPEED; if (!ospeed) ospeed = TTYDEF_SPEED; } else { ospeed = ispeed = op->speeds[FIRST_SPEED]; } /* * Initial termios 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 * later on. */ /* Flush input and output queues, important for modems! */ tcflush(STDIN_FILENO, TCIOFLUSH); #ifdef IUTF8 tp->c_iflag = tp->c_iflag & IUTF8; if (tp->c_iflag & IUTF8) op->flags |= F_UTF8; #else tp->c_iflag = 0; #endif tp->c_lflag = 0; tp->c_oflag &= OPOST | ONLCR; if ((op->flags & F_KEEPCFLAGS) == 0) tp->c_cflag = CS8 | HUPCL | CREAD | (tp->c_cflag & CLOCAL); /* * Note that the speed is stored in the c_cflag termios field, so we have * set the speed always when the cflag se reseted. */ cfsetispeed(tp, ispeed); cfsetospeed(tp, ospeed); if (op->flags & F_LOCAL) tp->c_cflag |= CLOCAL; #ifdef HAVE_STRUCT_TERMIOS_C_LINE tp->c_line = 0; #endif tp->c_cc[VMIN] = 1; tp->c_cc[VTIME] = 0; /* Check for terminal size and if not found set default */ if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == 0) { int set = 0; if (ws.ws_row == 0) { ws.ws_row = 24; set++; } if (ws.ws_col == 0) { ws.ws_col = 80; set++; } ioctl(STDIN_FILENO, TIOCSWINSZ, &ws); } /* Optionally enable hardware flow control. */ #ifdef CRTSCTS if (op->flags & F_RTSCTS) tp->c_cflag |= CRTSCTS; #endif tcsetattr(STDIN_FILENO, TCSANOW, tp); /* Go to blocking input even in local mode. */ fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL, 0) & ~O_NONBLOCK); debug("term_io 2\n"); } /* Reset virtual console on stdin to its defaults */ static void reset_vc(const struct options *op, struct termios *tp) { int fl = 0; fl |= (op->flags & F_KEEPCFLAGS) == 0 ? 0 : UL_TTY_KEEPCFLAGS; fl |= (op->flags & F_UTF8) == 0 ? 0 : UL_TTY_UTF8; reset_virtual_console(tp, fl); if (tcsetattr(STDIN_FILENO, TCSADRAIN, tp)) log_warn("tcsetattr problem: %m"); } /* Extract baud rate from modem status message. */ static void auto_baud(struct termios *tp) { speed_t 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: * * * * 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 later on. */ iflag = tp->c_iflag; /* Enable 8th-bit stripping. */ tp->c_iflag |= ISTRIP; vmin = tp->c_cc[VMIN]; /* Do not block when queue is empty. */ tp->c_cc[VMIN] = 0; tcsetattr(STDIN_FILENO, 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); if ((nread = read(STDIN_FILENO, buf, sizeof(buf) - 1)) > 0) { buf[nread] = '\0'; for (bp = buf; bp < buf + nread; bp++) if (isascii(*bp) && isdigit(*bp)) { if ((speed = bcode(bp))) { cfsetispeed(tp, speed); cfsetospeed(tp, speed); } break; } } /* Restore terminal settings. Errors will be dealt with later on. */ tp->c_iflag = iflag; tp->c_cc[VMIN] = vmin; tcsetattr(STDIN_FILENO, TCSANOW, tp); } /* Show login prompt, optionally preceded by /etc/issue contents. */ static void do_prompt(struct options *op, struct termios *tp) { #ifdef ISSUE FILE *fd; #endif /* ISSUE */ if ((op->flags & F_NONL) == 0) { /* Issue not in use, start with a new line. */ write_all(STDOUT_FILENO, "\r\n", 2); } #ifdef ISSUE if ((op->flags & F_ISSUE) && (fd = fopen(op->issue, "r"))) { int c, oflag = tp->c_oflag; /* Save current setting. */ if ((op->flags & F_VCONSOLE) == 0) { /* Map new line in output to carriage return & new line. */ tp->c_oflag |= (ONLCR | OPOST); tcsetattr(STDIN_FILENO, TCSADRAIN, tp); } while ((c = getc(fd)) != EOF) { if (c == '\\') output_special_char(getc(fd), op, tp); else putchar(c); } fflush(stdout); if ((op->flags & F_VCONSOLE) == 0) { /* Restore settings. */ tp->c_oflag = oflag; /* Wait till output is gone. */ tcsetattr(STDIN_FILENO, TCSADRAIN, tp); } fclose(fd); } #endif /* ISSUE */ if (op->flags & F_LOGINPAUSE) { puts("[press ENTER to login]"); getc(stdin); } #ifdef KDGKBLED if (!(op->flags & F_NOHINTS) && !op->autolog && (op->flags & F_VCONSOLE)) { int kb = 0; if (ioctl(STDIN_FILENO, KDGKBLED, &kb) == 0) { char hint[256] = { '\0' }; int nl = 0; struct stat st; if (stat("/var/run/numlock-on", &st) == 0) nl = 1; if (nl && (kb & 0x02) == 0) append(hint, sizeof(hint), NULL, _("Num Lock off")); else if (nl == 0 && (kb & 2) && (kb & 0x20) == 0) append(hint, sizeof(hint), NULL, _("Num Lock on")); if ((kb & 0x04) && (kb & 0x40) == 0) append(hint, sizeof(hint), ", ", _("Caps Lock on")); if ((kb & 0x01) && (kb & 0x10) == 0) append(hint, sizeof(hint), ", ", _("Scroll Lock on")); if (*hint) printf(_("Hint: %s\n\n"), hint); } } #endif /* KDGKBLED */ if ((op->flags & F_NOHOSTNAME) == 0) { char hn[MAXHOSTNAMELEN + 1]; if (gethostname(hn, sizeof(hn)) == 0) { struct hostent *ht; char *dot = strchr(hn, '.'); hn[MAXHOSTNAMELEN] = '\0'; if ((op->flags & F_LONGHNAME) == 0) { if (dot) *dot = '\0'; write_all(STDOUT_FILENO, hn, strlen(hn)); } else if (dot == NULL && (ht = gethostbyname(hn))) write_all(STDOUT_FILENO, ht->h_name, strlen(ht->h_name)); else write_all(STDOUT_FILENO, hn, strlen(hn)); write_all(STDOUT_FILENO, " ", 1); } } if (op->autolog == (char*)0) { /* Always show login prompt. */ write_all(STDOUT_FILENO, LOGIN, sizeof(LOGIN) - 1); } } /* Select next baud rate. */ static void next_speed(struct options *op, struct termios *tp) { static int baud_index = -1; if (baud_index == -1) /* * If the F_KEEPSPEED flags is set then the FIRST_SPEED is not * tested yet (see termio_init()). */ baud_index = (op->flags & F_KEEPSPEED) ? FIRST_SPEED : 1 % op->numspeed; else baud_index = (baud_index + 1) % op->numspeed; cfsetispeed(tp, op->speeds[baud_index]); cfsetospeed(tp, op->speeds[baud_index]); tcsetattr(STDIN_FILENO, TCSANOW, tp); } /* Get user name, establish parity, speed, erase, kill & eol. */ static char *get_logname(struct options *op, struct termios *tp, struct chardata *cp) { static char logname[BUFSIZ]; char *bp; char c; /* input character, full eight bits */ char ascval; /* low 7 bits of input character */ int eightbit; 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 (especially important after parsing or switching * the baud rate). */ if ((op->flags & F_VCONSOLE) == 0) sleep(1); tcflush(STDIN_FILENO, TCIFLUSH); eightbit = (op->flags & F_EIGHTBITS); bp = logname; *bp = '\0'; while (*logname == '\0') { /* Write issue file and prompt */ do_prompt(op, tp); cp->eol = '\0'; /* Read name, watch for break and end-of-line. */ while (cp->eol == '\0') { if (read(STDIN_FILENO, &c, 1) < 1) { /* Do not report trivial like EINTR/EIO errors. */ if (errno == EINTR || errno == EAGAIN) { usleep(1000); continue; } switch (errno) { case 0: case EIO: case ESRCH: case EINVAL: case ENOENT: break; default: log_err(_("%s: read: %m"), op->tty); } } /* Do parity bit handling. */ if (eightbit) ascval = c; else if (c != (ascval = (c & 0177))) { uint32_t bits; /* # of "1" bits per character */ uint32_t mask; /* mask with 1 bit up */ for (bits = 1, mask = 1; mask & 0177; mask <<= 1) { if (mask & ascval) bits++; } cp->parity |= ((bits & 1) ? 1 : 2); } /* Do erase, kill and end-of-line processing. */ switch (ascval) { case 0: *bp = 0; if (op->numspeed > 1) return NULL; break; 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) { if ((tp->c_lflag & ECHO) == 0) write_all(1, erase[cp->parity], 3); bp--; } break; case CTL('U'): case '@': cp->kill = ascval; /* set kill character */ while (bp > logname) { if ((tp->c_lflag & ECHO) == 0) write_all(1, erase[cp->parity], 3); bp--; } break; case CTL('D'): exit(EXIT_SUCCESS); default: if (!isascii(ascval) || !isprint(ascval)) break; if ((size_t)(bp - logname) >= sizeof(logname) - 1) log_err(_("%s: input overrun"), op->tty); if ((tp->c_lflag & ECHO) == 0) write_all(1, &c, 1); /* echo the character */ *bp++ = ascval; /* and store it */ break; } } } #ifdef HAVE_WIDECHAR if ((op->flags & (F_EIGHTBITS|F_UTF8)) == (F_EIGHTBITS|F_UTF8)) { /* Check out UTF-8 multibyte characters */ ssize_t len; wchar_t *wcs, *wcp; len = mbstowcs((wchar_t *)0, logname, 0); if (len < 0) log_err("%s: invalid character conversion for login name", op->tty); wcs = (wchar_t *) malloc((len + 1) * sizeof(wchar_t)); if (!wcs) log_err(_("failed to allocate memory: %m")); len = mbstowcs(wcs, logname, len + 1); if (len < 0) log_err("%s: invalid character conversion for login name", op->tty); wcp = wcs; while (*wcp) { const wint_t wc = *wcp++; if (!iswprint(wc)) log_err("%s: invalid character 0x%x in login name", op->tty, wc); } free(wcs); } else #endif if ((op->flags & F_LCUC) && (cp->capslock = caps_lock(logname))) { /* Handle names with upper case and no lower case. */ for (bp = logname; *bp; bp++) if (isupper(*bp)) *bp = tolower(*bp); /* map name to lower case */ } return logname; } /* Set the final tty mode bits. */ static void termio_final(struct options *op, struct termios *tp, struct chardata *cp) { /* General terminal-independent stuff. */ /* 2-way flow control */ tp->c_iflag |= IXON | IXOFF; 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; tp->c_cc[VQUIT] = DEF_QUIT; tp->c_cc[VEOF] = DEF_EOF; tp->c_cc[VEOL] = DEF_EOL; #ifdef __linux__ tp->c_cc[VSWTC] = DEF_SWITCH; #elif defined(VSWTCH) tp->c_cc[VSWTCH] = DEF_SWITCH; #endif /* __linux__ */ /* Account for special characters seen in input. */ if (cp->eol == CR) { tp->c_iflag |= ICRNL; tp->c_oflag |= ONLCR; } tp->c_cc[VERASE] = cp->erase; tp->c_cc[VKILL] = cp->kill; /* 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; /* do not break */ case 2: /* even parity */ tp->c_cflag |= PARENB; tp->c_iflag |= INPCK | ISTRIP; /* do not break */ 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) { #ifdef IUCLC tp->c_iflag |= IUCLC; #endif #ifdef XCASE tp->c_lflag |= XCASE; #endif #ifdef OLCUC tp->c_oflag |= OLCUC; #endif } /* Optionally enable hardware flow control. */ #ifdef CRTSCTS if (op->flags & F_RTSCTS) tp->c_cflag |= CRTSCTS; #endif /* Finally, make the new settings effective. */ if (tcsetattr(STDIN_FILENO, TCSANOW, tp) < 0) log_err("%s: tcsetattr: TCSANOW: %m", op->tty); } /* * String contains upper case without lower case. * http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=52940 * http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=156242 */ static int caps_lock(char *s) { int capslock; for (capslock = 0; *s; s++) { if (islower(*s)) return EXIT_SUCCESS; if (capslock == 0) capslock = isupper(*s); } return capslock; } /* Convert speed string to speed code; return 0 on failure. */ static speed_t bcode(char *s) { const struct Speedtab *sp; long speed = atol(s); for (sp = speedtab; sp->speed; sp++) if (sp->speed == speed) return sp->code; return 0; } static void __attribute__ ((__noreturn__)) usage(FILE * out) { fprintf(out, _("\nUsage:\n" " %1$s [options] line baud_rate,... [termtype]\n" " %1$s [options] baud_rate,... line [termtype]\n"), program_invocation_short_name); fprintf(out, _("\nOptions:\n" " -8, --8bits assume 8-bit tty\n" " -a, --autologin login the specified user automatically\n" " -c, --noreset do not reset control mode\n" " -f, --issue-file display issue file\n" " -h, --flow-control enable hardware flow control\n" " -H, --host specify login host\n" " -i, --noissue do not display issue file\n" " -I, --init-string set init string\n" " -l, --login-program specify login program\n" " -L, --local-line force local line\n" " -m, --extract-baud extract baud rate during connect\n" " -n, --skip-login do not prompt for login\n" " -o, --login-options options that are passed to login\n" " -p, --loginpause wait for any key before the login\n" " -R, --hangup do virtually hangup on the tty\n" " -s, --keep-baud try to keep baud rate after break\n" " -t, --timeout login process timeout\n" " -U, --detect-case detect uppercase terminal\n" " -w, --wait-cr wait carriage-return\n" " --noclear do not clear the screen before prompt\n" " --nohints do not print hints\n" " --nonewline do not print a newline before issue\n" " --no-hostname no hostname at all will be shown\n" " --long-hostname show full qualified hostname\n" " --version output version information and exit\n" " --help display this help and exit\n\n")); exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); } /* * Helper function reports errors to console or syslog. * Will be used by log_err() and log_warn() therefore * it takes a format as well as va_list. */ #define str2cpy(b,s1,s2) strcat(strcpy(b,s1),s2) static void dolog(int priority, const char *fmt, va_list ap) { #ifndef USE_SYSLOG int fd; #endif char buf[BUFSIZ]; char *bp; /* * If the diagnostic is reported via syslog(3), the process name is * automatically prepended to the message. If we write directly to * /dev/console, we must prepend the process name ourselves. */ #ifdef USE_SYSLOG buf[0] = '\0'; bp = buf; #else str2cpy(buf, program_invocation_short_name, ": "); bp = buf + strlen(buf); #endif /* USE_SYSLOG */ vsnprintf(bp, sizeof(buf)-strlen(buf), fmt, ap); /* * Write the diagnostic directly to /dev/console if we do not use the * syslog(3) facility. */ #ifdef USE_SYSLOG openlog(program_invocation_short_name, LOG_PID, LOG_AUTHPRIV); syslog(priority, "%s", buf); closelog(); #else /* Terminate with CR-LF since the console mode is unknown. */ strcat(bp, "\r\n"); if ((fd = open("/dev/console", 1)) >= 0) { write_all(fd, buf, strlen(buf)); close(fd); } #endif /* USE_SYSLOG */ } static void log_err(const char *fmt, ...) { va_list ap; va_start(ap, fmt); dolog(LOG_ERR, fmt, ap); va_end(ap); /* Be kind to init(8). */ sleep(10); exit(EXIT_FAILURE); } static void log_warn(const char *fmt, ...) { va_list ap; va_start(ap, fmt); dolog(LOG_WARNING, fmt, ap); va_end(ap); } static void output_special_char(unsigned char c, struct options *op, struct termios *tp) { struct utsname uts; uname(&uts); switch (c) { case 's': printf("%s", uts.sysname); break; case 'n': printf("%s", uts.nodename); break; case 'r': printf("%s", uts.release); break; case 'v': printf("%s", uts.version); break; case 'm': printf("%s", uts.machine); break; case 'o': { char domainname[MAXHOSTNAMELEN+1]; #ifdef HAVE_GETDOMAINNAME if (getdomainname(domainname, sizeof(domainname))) #endif strcpy(domainname, "unknown_domain"); domainname[sizeof(domainname)-1] = '\0'; printf("%s", domainname); break; } case 'O': { char *dom = "unknown_domain"; char host[MAXHOSTNAMELEN+1]; struct addrinfo hints, *info = NULL; memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_CANONNAME; if (gethostname(host, sizeof(host)) || getaddrinfo(host, NULL, &hints, &info) || info == NULL) fputs(dom, stdout); else { char *canon; if (info->ai_canonname && (canon = strchr(info->ai_canonname, '.'))) dom = canon + 1; fputs(dom, stdout); freeaddrinfo(info); } break; } case 'd': case 't': { time_t now; struct tm *tm; time(&now); tm = localtime(&now); if (!tm) break; if (c == 'd') /* ISO 8601 */ printf("%s %s %d %d", nl_langinfo(ABDAY_1 + tm->tm_wday), nl_langinfo(ABMON_1 + tm->tm_mon), tm->tm_mday, tm->tm_year < 70 ? tm->tm_year + 2000 : tm->tm_year + 1900); else printf("%02d:%02d:%02d", tm->tm_hour, tm->tm_min, tm->tm_sec); break; } case 'l': printf ("%s", op->tty); break; case 'b': { const speed_t speed = cfgetispeed(tp); int i; for (i = 0; speedtab[i].speed; i++) { if (speedtab[i].code == speed) { printf("%ld", speedtab[i].speed); break; } } break; } case 'u': case 'U': { int users = 0; struct utmp *ut; setutent(); while ((ut = getutent())) if (ut->ut_type == USER_PROCESS) users++; endutent(); printf ("%d ", users); if (c == 'U') printf((users == 1) ? _("user") : _("users")); break; } default: putchar(c); break; } } static void init_special_char(char* arg, struct options *op) { char ch, *p, *q; int i; op->initstring = malloc(strlen(arg) + 1); if (!op->initstring) log_err(_("failed to allocate memory: %m")); /* * Copy optarg into op->initstring decoding \ddd octal * codes into chars. */ q = op->initstring; p = arg; while (*p) { /* The \\ is converted to \ */ if (*p == '\\') { p++; if (*p == '\\') { ch = '\\'; p++; } else { /* Handle \000 - \177. */ ch = 0; for (i = 1; i <= 3; i++) { if (*p >= '0' && *p <= '7') { ch <<= 3; ch += *p - '0'; p++; } else { break; } } } *q++ = ch; } else *q++ = *p++; } *q = '\0'; } /* * Appends @str to @dest and if @dest is not empty then use use @sep as a * separator. The maximal final length of the @dest is @len. * * Returns the final @dest length or -1 in case of error. */ static ssize_t append(char *dest, size_t len, const char *sep, const char *src) { size_t dsz = 0, ssz = 0, sz; char *p; if (!dest || !len || !src) return -1; if (*dest) dsz = strlen(dest); if (dsz && sep) ssz = strlen(sep); sz = strlen(src); if (dsz + ssz + sz + 1 > len) return -1; p = dest + dsz; if (ssz) { memcpy(p, sep, ssz); p += ssz; } memcpy(p, src, sz); *(p + sz) = '\0'; return dsz + ssz + sz; } /* * Do not allow the user to pass an option as a user name * To be more safe: Use `--' to make sure the rest is * interpreted as non-options by the program, if it supports it. */ static void check_username(const char* nm) { const char *p = nm; if (!nm) goto err; if (strlen(nm) > 42) goto err; while (isspace(*p)) p++; if (*p == '-') goto err; return; err: errno = EPERM; log_err("checkname: %m"); }