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-rw-r--r--term-utils/agetty.c1914
1 files changed, 1914 insertions, 0 deletions
diff --git a/term-utils/agetty.c b/term-utils/agetty.c
new file mode 100644
index 0000000..43243f9
--- /dev/null
+++ b/term-utils/agetty.c
@@ -0,0 +1,1914 @@
+/*
+ * 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 <poe@daimi.aau.dk>
+ * Adopt the mingetty features for a better support
+ * of virtual consoles by Werner Fink <werner@suse.de>
+ *
+ * This program is freely distributable.
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <signal.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <utmp.h>
+#include <getopt.h>
+#include <time.h>
+#include <sys/file.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <langinfo.h>
+#include <grp.h>
+
+#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 <sys/kd.h>
+# include <sys/param.h>
+# 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 <syslog.h>
+#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 <sys/utsname.h>
+#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) do { fprintf(dbf,s); fflush(dbf); } while (0)
+FILE *dbf;
+#else
+#define debug(s) do { ; } while (0)
+#endif
+
+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<n> into tts/<n>
+ * turn tty<n> into vc/<n>
+ * 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, closed = 0;
+
+ /* 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);
+ }
+
+ close(STDIN_FILENO);
+ errno = 0;
+
+ if (op->flags & F_HANGUP) {
+
+ if (ioctl(fd, TIOCNOTTY))
+ debug("TIOCNOTTY ioctl failed\n");
+
+ /*
+ * Let's close all file decriptors before vhangup
+ * https://lkml.org/lkml/2012/6/5/145
+ */
+ close(fd);
+ close(STDOUT_FILENO);
+ close(STDERR_FILENO);
+ errno = 0;
+ closed = 1;
+
+ if (vhangup())
+ log_err("/dev/%s: vhangup() failed: %m", tty);
+ } else
+ close(fd);
+
+ 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_warn("/dev/%s: cannot set process group: %m", tty);
+
+ /* Get rid of the present outputs. */
+ if (!closed) {
+ 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++;
+ }
+ if (ioctl(STDIN_FILENO, TIOCSWINSZ, &ws))
+ debug("TIOCSWINSZ ioctl failed\n");
+ }
+
+ /* 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:
+ *
+ * <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 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;
+
+ if (access(_PATH_NUMLOCK_ON, F_OK) == 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 <user> login the specified user automatically\n"
+ " -c, --noreset do not reset control mode\n"
+ " -f, --issue-file <file> display issue file\n"
+ " -h, --flow-control enable hardware flow control\n"
+ " -H, --host <hostname> specify login host\n"
+ " -i, --noissue do not display issue file\n"
+ " -I, --init-string <string> set init string\n"
+ " -l, --login-program <file> 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 <opts> 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 <number> 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");
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2025-06-08 12:36:33 +0000