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util-linux/term-utils/agetty.c

2944 lines
71 KiB

/*
* 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 <sys/wait.h>
#include <fcntl.h>
#include <stdarg.h>
#include <ctype.h>
#include <utmpx.h>
#include <getopt.h>
#include <time.h>
#include <sys/socket.h>
#include <langinfo.h>
#include <grp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <sys/utsname.h>
#include "strutils.h"
#include "all-io.h"
#include "nls.h"
#include "pathnames.h"
#include "c.h"
#include "cctype.h"
#include "widechar.h"
#include "ttyutils.h"
#include "color-names.h"
#include "env.h"
#ifdef USE_PLYMOUTH_SUPPORT
# include "plymouth-ctrl.h"
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#if defined(__FreeBSD_kernel__)
# include <pty.h>
# ifdef HAVE_UTMP_H
# include <utmp.h>
# endif
# ifdef HAVE_LIBUTIL_H
# include <libutil.h>
# endif
#endif
#ifdef __linux__
# include <sys/kd.h>
# define USE_SYSLOG
# ifndef DEFAULT_VCTERM
# define DEFAULT_VCTERM "linux"
# endif
# if defined (__s390__) || defined (__s390x__)
# define DEFAULT_TTYS0 "dumb"
# define DEFAULT_TTY32 "ibm327x"
# define DEFAULT_TTYS1 "vt220"
# 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
#ifdef __FreeBSD_kernel__
#define USE_SYSLOG
#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_SUPPORT 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_SUPPORT
# if defined(HAVE_SCANDIRAT) && defined(HAVE_OPENAT)
# include <dirent.h>
# include "fileutils.h"
# define ISSUEDIR_SUPPORT
# define ISSUEDIR_EXT ".issue"
# define ISSUEDIR_EXTSIZ (sizeof(ISSUEDIR_EXT) - 1)
# endif
#endif
/* Login prompt. */
#define LOGIN "login: "
#define LOGIN_ARGV_MAX 16 /* Numbers of args for login */
/*
* agetty --reload
*/
#ifdef AGETTY_RELOAD
# include <sys/inotify.h>
# include <linux/netlink.h>
# include <linux/rtnetlink.h>
# define AGETTY_RELOAD_FILENAME "/run/agetty.reload" /* trigger file */
# define AGETTY_RELOAD_FDNONE -2 /* uninitialized fd */
static int inotify_fd = AGETTY_RELOAD_FDNONE;
static int netlink_fd = AGETTY_RELOAD_FDNONE;
static uint32_t netlink_groups;
#endif
struct issue {
FILE *output;
char *mem;
size_t mem_sz;
#ifdef AGETTY_RELOAD
char *mem_old;
#endif
unsigned int do_tcsetattr : 1,
do_tcrestore : 1;
};
/*
* 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 */
unsigned 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 or directory */
char *erasechars; /* string with erase chars */
char *killchars; /* string with kill chars */
char *osrelease; /* /etc/os-release data */
unsigned int delay; /* Sleep seconds before prompt */
int nice; /* Run login with this priority */
int numspeed; /* number of baud rates to try */
int clocal; /* CLOCAL_MODE_* */
int kbmode; /* Keyboard mode if virtual console */
speed_t speeds[MAX_SPEED]; /* baud rates to be tried */
};
enum {
CLOCAL_MODE_AUTO = 0,
CLOCAL_MODE_ALWAYS,
CLOCAL_MODE_NEVER
};
#define F_PARSE (1<<0) /* process modem status messages */
#define F_ISSUE (1<<1) /* display /etc/issue or /etc/issue.d */
#define F_RTSCTS (1<<2) /* enable RTS/CTS flow control */
#define F_INITSTRING (1<<4) /* initstring is set */
#define F_WAITCRLF (1<<5) /* wait for CR or LF */
#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))
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},
#elif defined(EXTA)
{19200, EXTA},
#endif
#ifdef B38400
{38400, B38400},
#elif defined(EXTB)
{38400, EXTB},
#endif
#ifdef B57600
{57600, B57600},
#endif
#ifdef B115200
{115200, B115200},
#endif
#ifdef B230400
{230400, B230400},
#endif
#ifdef B460800
{460800, B460800},
#endif
#ifdef B500000
{500000, B500000},
#endif
#ifdef B576000
{576000, B576000},
#endif
#ifdef B921600
{921600, B921600},
#endif
#ifdef B1000000
{1000000, B1000000},
#endif
#ifdef B1152000
{1152000, B1152000},
#endif
#ifdef B1500000
{1500000, B1500000},
#endif
#ifdef B2000000
{2000000, B2000000},
#endif
#ifdef B2500000
{2500000, B2500000},
#endif
#ifdef B3000000
{3000000, B3000000},
#endif
#ifdef B3500000
{3500000, B3500000},
#endif
#ifdef B4000000
{4000000, B4000000},
#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, int canon);
static void auto_baud(struct termios *tp);
static void list_speeds(void);
static void output_special_char (struct issue *ie, unsigned char c, struct options *op,
struct termios *tp, FILE *fp);
static void do_prompt(struct issue *ie, struct options *op, struct termios *tp);
static void next_speed(struct options *op, struct termios *tp);
static char *get_logname(struct issue *ie, 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(void) __attribute__((__noreturn__));
static void exit_slowly(int code) __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);
static void reload_agettys(void);
static void print_issue_file(struct issue *ie, struct options *op, struct termios *tp);
static void eval_issue_file(struct issue *ie, struct options *op, struct termios *tp);
static void show_issue(struct options *op);
/* Fake hostname for ut_host specified on command line. */
static char *fakehost;
#ifdef DEBUGGING
# include "closestream.h"
# ifndef DEBUG_OUTPUT
# define DEBUG_OUTPUT "/dev/tty10"
# endif
# 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 */
};
struct issue issue = {
.mem = NULL,
};
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(DEBUG_OUTPUT, "w");
for (int i = 1; i < argc; i++) {
if (i > 1)
debug(" ");
debug(argv[i]);
}
debug("\n");
#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());
/* Default is to follow the current line speed and then default to 9600 */
if ((options.flags & F_VCONSOLE) == 0 && options.numspeed == 0) {
options.speeds[options.numspeed++] = bcode("9600");
options.flags |= F_KEEPSPEED;
}
/* 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 (options.flags & F_VCONSOLE || options.clocal != CLOCAL_MODE_ALWAYS)
/* Go to blocking mode unless -L is specified, this change
* affects stdout, stdin and stderr as all the file descriptors
* are created by dup(). */
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(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;
}
}
INIT_CHARDATA(&chardata);
if (options.autolog) {
debug("doing auto login\n");
username = options.autolog;
}
if (options.flags & F_NOPROMPT) { /* --skip-login */
eval_issue_file(&issue, &options, &termios);
print_issue_file(&issue, &options, &termios);
} else { /* regular (auto)login */
if (options.autolog) {
/* Autologin prompt */
eval_issue_file(&issue, &options, &termios);
do_prompt(&issue, &options, &termios);
printf(_("%s%s (automatic login)\n"), LOGIN, options.autolog);
} else {
/* Read the login name. */
debug("reading login name\n");
while ((username =
get_logname(&issue, &options, &termios, &chardata)) == NULL)
if ((options.flags & F_VCONSOLE) == 0 && options.numspeed)
next_speed(&options, &termios);
}
}
/* Disable timer. */
if (options.timeout)
alarm(0);
/* Finalize the termios settings. */
if ((options.flags & F_VCONSOLE) == 0)
termio_final(&options, &termios, &chardata);
else
reset_vc(&options, &termios, 1);
/* 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 (options.flags & F_REMOTE) {
if (fakehost) {
login_argv[login_argc++] = "-h";
login_argv[login_argc++] = fakehost;
} else if (options.flags & F_NOHOSTNAME)
login_argv[login_argc++] = "-H";
}
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 && chroot(options.chroot) < 0)
log_err(_("%s: can't change root directory %s: %m"),
options.tty, options.chroot);
if (options.chdir && chdir(options.chdir) < 0)
log_err(_("%s: can't change working directory %s: %m"),
options.tty, options.chdir);
if (options.nice && nice(options.nice) < 0)
log_warn(_("%s: can't change process priority: %m"),
options.tty);
free(options.osrelease);
#ifdef DEBUGGING
if (close_stream(dbf) != 0)
log_err("write failed: %s", DEBUG_OUTPUT);
#endif
/* 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' */
free(old);
return username;
}
tp = entry = malloc(sz + usz);
if (!tp)
log_err(_("failed to allocate memory: %m"));
if (p != str) {
/* copy chars before \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;
}
static void output_version(void)
{
static const char *features[] = {
#ifdef DEBUGGING
"debug",
#endif
#ifdef CRTSCTS
"flow control",
#endif
#ifdef KDGKBLED
"hints",
#endif
#ifdef ISSUE_SUPPORT
"issue",
#endif
#ifdef ISSUEDIR_SUPPORT
"issue.d",
#endif
#ifdef KDGKBMODE
"keyboard mode",
#endif
#ifdef USE_PLYMOUTH_SUPPORT
"plymouth",
#endif
#ifdef AGETTY_RELOAD
"reload",
#endif
#ifdef USE_SYSLOG
"syslog",
#endif
#ifdef HAVE_WIDECHAR
"widechar",
#endif
NULL
};
unsigned int i;
printf( _("%s from %s"), program_invocation_short_name, PACKAGE_STRING);
fputs(" (", stdout);
for (i = 0; features[i]; i++) {
if (0 < i)
fputs(", ", stdout);
printf("%s", features[i]);
}
fputs(")\n", stdout);
}
#define is_speed(str) (strlen((str)) == strspn((str), "0123456789,"))
/* 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,
ERASE_CHARS_OPTION,
KILL_CHARS_OPTION,
RELOAD_OPTION,
LIST_SPEEDS_OPTION,
ISSUE_SHOW_OPTION,
};
const struct option longopts[] = {
{ "8bits", no_argument, NULL, '8' },
{ "autologin", required_argument, NULL, 'a' },
{ "noreset", no_argument, NULL, 'c' },
{ "chdir", required_argument, NULL, 'C' },
{ "delay", required_argument, NULL, 'd' },
{ "remote", no_argument, NULL, 'E' },
{ "issue-file", required_argument, NULL, 'f' },
{ "show-issue", no_argument, NULL, ISSUE_SHOW_OPTION },
{ "flow-control", no_argument, NULL, 'h' },
{ "host", required_argument, NULL, 'H' },
{ "noissue", no_argument, NULL, 'i' },
{ "init-string", required_argument, NULL, 'I' },
{ "noclear", no_argument, NULL, 'J' },
{ "login-program", required_argument, NULL, 'l' },
{ "local-line", optional_argument, NULL, 'L' },
{ "extract-baud", no_argument, NULL, 'm' },
{ "list-speeds", no_argument, NULL, LIST_SPEEDS_OPTION },
{ "skip-login", no_argument, NULL, 'n' },
{ "nonewline", no_argument, NULL, 'N' },
{ "login-options", required_argument, NULL, 'o' },
{ "login-pause", no_argument, NULL, 'p' },
{ "nice", required_argument, NULL, 'P' },
{ "chroot", required_argument, NULL, 'r' },
{ "hangup", no_argument, NULL, 'R' },
{ "keep-baud", no_argument, NULL, 's' },
{ "timeout", required_argument, NULL, 't' },
{ "detect-case", no_argument, NULL, 'U' },
{ "wait-cr", no_argument, NULL, 'w' },
{ "nohints", no_argument, NULL, NOHINTS_OPTION },
{ "nohostname", no_argument, NULL, NOHOSTNAME_OPTION },
{ "long-hostname", no_argument, NULL, LONGHOSTNAME_OPTION },
{ "reload", no_argument, NULL, RELOAD_OPTION },
{ "version", no_argument, NULL, VERSION_OPTION },
{ "help", no_argument, NULL, HELP_OPTION },
{ "erase-chars", required_argument, NULL, ERASE_CHARS_OPTION },
{ "kill-chars", required_argument, NULL, KILL_CHARS_OPTION },
{ NULL, 0, NULL, 0 }
};
while ((c = getopt_long(argc, argv,
"8a:cC:d:Ef:hH:iI:Jl:L::mnNo: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 = strtou32_or_err(optarg, _("invalid delay argument"));
break;
case 'E':
op->flags |= F_REMOTE;
break;
case 'f':
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':
/* -L and -L=always have the same meaning */
op->clocal = CLOCAL_MODE_ALWAYS;
if (optarg) {
if (strcmp(optarg, "=always") == 0)
op->clocal = CLOCAL_MODE_ALWAYS;
else if (strcmp(optarg, "=never") == 0)
op->clocal = CLOCAL_MODE_NEVER;
else if (strcmp(optarg, "=auto") == 0)
op->clocal = CLOCAL_MODE_AUTO;
else
log_err(_("invalid argument of --local-line"));
}
break;
case 'm':
op->flags |= F_PARSE;
break;
case 'n':
op->flags |= F_NOPROMPT;
break;
case 'N':
op->flags |= F_NONL;
break;
case 'o':
op->logopt = optarg;
break;
case 'p':
op->flags |= F_LOGINPAUSE;
break;
case 'P':
op->nice = strtos32_or_err(optarg, _("invalid nice argument"));
break;
case 'r':
op->chroot = optarg;
break;
case 'R':
op->flags |= F_HANGUP;
break;
case 's':
op->flags |= F_KEEPSPEED;
break;
case 't':
op->timeout = strtou32_or_err(optarg, _("invalid timeout argument"));
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 ERASE_CHARS_OPTION:
op->erasechars = optarg;
break;
case KILL_CHARS_OPTION:
op->killchars = optarg;
break;
case RELOAD_OPTION:
reload_agettys();
exit(EXIT_SUCCESS);
case LIST_SPEEDS_OPTION:
list_speeds();
exit(EXIT_SUCCESS);
case ISSUE_SHOW_OPTION:
show_issue(op);
exit(EXIT_SUCCESS);
break;
case VERSION_OPTION:
output_version();
exit(EXIT_SUCCESS);
case HELP_OPTION:
usage();
default:
errtryhelp(EXIT_FAILURE);
}
}
debug("after getopt loop\n");
if (argc < optind + 1) {
log_warn(_("not enough arguments"));
errx(EXIT_FAILURE, _("not enough arguments"));
}
/* Accept "tty", "baudrate tty", and "tty baudrate". */
if (is_speed(argv[optind])) {
/* Assume BSD style speed. */
parse_speeds(op, argv[optind++]);
if (argc < optind + 1) {
log_warn(_("not enough arguments"));
errx(EXIT_FAILURE, _("not enough arguments"));
}
op->tty = argv[optind++];
} else {
op->tty = argv[optind++];
if (argc > optind) {
char *v = argv[optind];
if (is_speed(v)) {
parse_speeds(op, v);
optind++;
}
}
}
/* 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];
debug("exiting parseargs\n");
}
/* Parse alternate baud rates. */
static void parse_speeds(struct options *op, char *arg)
{
char *cp;
char *str = strdup(arg);
if (!str)
log_err(_("failed to allocate memory: %m"));
debug("entered parse_speeds:\n");
for (cp = strtok(str, ","); cp != NULL; 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");
free(str);
}
#ifdef SYSV_STYLE
/* Update our utmp entry. */
static void update_utmp(struct options *op)
{
struct utmpx ut;
time_t t;
pid_t pid = getpid();
pid_t sid = getsid(0);
char *vcline = op->vcline;
char *line = op->tty;
struct utmpx *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.
*/
utmpxname(_PATH_UTMP);
setutxent();
/*
* 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 = getutxent()))
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 */
str2memcpy(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;
str2memcpy(ut.ut_id, ptr, sizeof(ut.ut_id));
}
}
str2memcpy(ut.ut_user, "LOGIN", sizeof(ut.ut_user));
str2memcpy(ut.ut_line, line, sizeof(ut.ut_line));
if (fakehost)
str2memcpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
time(&t);
ut.ut_tv.tv_sec = t;
ut.ut_type = LOGIN_PROCESS;
ut.ut_pid = pid;
ut.ut_session = sid;
pututxline(&ut);
endutxent();
updwtmpx(_PATH_WTMP, &ut);
}
#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 closed = 0;
#ifndef KDGKBMODE
int serial;
#endif
/* 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;
len = snprintf(buf, sizeof(buf), "/dev/%s", tty);
if (len < 0 || (size_t)len >= sizeof(buf))
log_err(_("/dev/%s: cannot open as standard input: %m"), tty);
/* 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);
/*
* 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 (fchown(fd, 0, gid) || fchmod(fd, (gid ? 0620 : 0600))) {
if (errno == EROFS)
log_warn("%s: %m", buf);
else
log_err("%s: %m", buf);
}
/* Sanity checks... */
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 (!isatty(fd))
log_err(_("/dev/%s: not a tty"), 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 descriptors 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: failed to get terminal attributes: %m"), tty);
#if defined (__s390__) || defined (__s390x__)
if (!op->term) {
/*
* Special terminal on first serial line on a S/390(x) which
* is due legacy reasons a block terminal of type 3270 or
* higher. Whereas the second serial line on a S/390(x) is
* a real character terminal which is compatible with VT220.
*/
if (strcmp(op->tty, "ttyS0") == 0) /* linux/drivers/s390/char/con3215.c */
op->term = DEFAULT_TTYS0;
else if (strncmp(op->tty, "3270/tty", 8) == 0) /* linux/drivers/s390/char/con3270.c */
op->term = DEFAULT_TTY32;
else if (strcmp(op->tty, "ttyS1") == 0) /* linux/drivers/s390/char/sclp_vt220.c */
op->term = DEFAULT_TTYS1;
}
#endif
#if defined(__FreeBSD_kernel__)
login_tty (0);
#endif
/*
* Detect if this is a virtual console or serial/modem line.
* In case of a virtual console the ioctl KDGKBMODE succeeds
* whereas on other lines it will fails.
*/
#ifdef KDGKBMODE
if (ioctl(STDIN_FILENO, KDGKBMODE, &op->kbmode) == 0)
#else
if (ioctl(STDIN_FILENO, TIOCMGET, &serial) < 0 && (errno == EINVAL))
#endif
{
op->flags |= F_VCONSOLE;
if (!op->term)
op->term = DEFAULT_VCTERM;
} else {
#ifdef K_RAW
op->kbmode = K_RAW;
#endif
if (!op->term)
op->term = DEFAULT_STERM;
}
if (setenv("TERM", op->term, 1) != 0)
log_err(_("failed to set the %s environment variable"), "TERM");
}
/* Initialize termios settings. */
static void termio_clear(int fd)
{
/*
* 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(fd, "\033[r\033[H\033[J", 9);
}
/* Initialize termios settings. */
static void termio_init(struct options *op, struct termios *tp)
{
speed_t ispeed, ospeed;
struct winsize ws;
#ifdef USE_PLYMOUTH_SUPPORT
struct termios lock;
int i = (plymouth_command(MAGIC_PING) == 0) ? PLYMOUTH_TERMIOS_FLAGS_DELAY : 0;
if (i)
plymouth_command(MAGIC_QUIT);
while (i-- > 0) {
/*
* Even with TTYReset=no it seems with systemd or plymouth
* the termios flags become changed from under the first
* agetty on a serial system console as the flags are locked.
*/
memset(&lock, 0, sizeof(struct termios));
if (ioctl(STDIN_FILENO, TIOCGLCKTRMIOS, &lock) < 0)
break;
if (!lock.c_iflag && !lock.c_oflag && !lock.c_cflag && !lock.c_lflag)
break;
debug("termios locked\n");
sleep(1);
}
memset(&lock, 0, sizeof(struct termios));
ioctl(STDIN_FILENO, TIOCSLCKTRMIOS, &lock);
#endif
if (op->flags & F_VCONSOLE) {
#if defined(IUTF8) && defined(KDGKBMODE)
switch(op->kbmode) {
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, 0);
if ((tp->c_cflag & (CS8|PARODD|PARENB)) == CS8)
op->flags |= F_EIGHTBITS;
if ((op->flags & F_NOCLEAR) == 0)
termio_clear(STDOUT_FILENO);
return;
}
/*
* Serial line
*/
if (op->flags & F_KEEPSPEED || !op->numspeed) {
/* 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.
*/
/* The default is set c_iflag in termio_final() according to chardata.
* Unfortunately, the chardata are not set according to the serial line
* if --autolog is enabled. In this case we do not read from the line
* at all. The best what we can do in this case is to keep c_iflag
* unmodified for --autolog.
*/
if (!op->autolog) {
#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 is reset.
*/
cfsetispeed(tp, ispeed);
cfsetospeed(tp, ospeed);
/* The default is to follow setting from kernel, but it's possible
* to explicitly remove/add CLOCAL flag by -L[=<mode>]*/
switch (op->clocal) {
case CLOCAL_MODE_ALWAYS:
tp->c_cflag |= CLOCAL; /* -L or -L=always */
break;
case CLOCAL_MODE_NEVER:
tp->c_cflag &= ~CLOCAL; /* -L=never */
break;
case CLOCAL_MODE_AUTO: /* -L=auto */
break;
}
#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) {
if (ws.ws_row == 0)
ws.ws_row = 24;
if (ws.ws_col == 0)
ws.ws_col = 80;
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
/* Flush input and output queues, important for modems! */
tcflush(STDIN_FILENO, TCIOFLUSH);
if (tcsetattr(STDIN_FILENO, TCSANOW, tp))
log_warn(_("setting terminal attributes failed: %m"));
/* 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 canon)
{
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);
#ifdef AGETTY_RELOAD
/*
* Discard all the flags that makes the line go canonical with echoing.
* We need to know when the user starts typing.
*/
if (canon == 0)
tp->c_lflag = 0;
#endif
if (tcsetattr(STDIN_FILENO, TCSADRAIN, tp))
log_warn(_("setting terminal attributes failed: %m"));
/* Go to blocking input even in local mode. */
fcntl(STDIN_FILENO, F_SETFL,
fcntl(STDIN_FILENO, F_GETFL, 0) & ~O_NONBLOCK);
}
/* 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 (c_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);
}
static char *xgethostname(void)
{
char *name;
size_t sz = get_hostname_max() + 1;
name = malloc(sizeof(char) * sz);
if (!name)
log_err(_("failed to allocate memory: %m"));
if (gethostname(name, sz) != 0) {
free(name);
return NULL;
}
name[sz - 1] = '\0';
return name;
}
static char *xgetdomainname(void)
{
#ifdef HAVE_GETDOMAINNAME
char *name;
const size_t sz = get_hostname_max() + 1;
name = malloc(sizeof(char) * sz);
if (!name)
log_err(_("failed to allocate memory: %m"));
if (getdomainname(name, sz) != 0) {
free(name);
return NULL;
}
name[sz - 1] = '\0';
return name;
#else
return NULL;
#endif
}
static char *read_os_release(struct options *op, const char *varname)
{
int fd = -1;
struct stat st;
size_t varsz = strlen(varname);
char *p, *buf = NULL, *ret = NULL;
/* read the file only once */
if (!op->osrelease) {
fd = open(_PATH_OS_RELEASE_ETC, O_RDONLY);
if (fd == -1) {
fd = open(_PATH_OS_RELEASE_USR, O_RDONLY);
if (fd == -1) {
log_warn(_("cannot open os-release file"));
return NULL;
}
}
if (fstat(fd, &st) < 0 || st.st_size > 4 * 1024 * 1024)
goto done;
op->osrelease = malloc(st.st_size + 1);
if (!op->osrelease)
log_err(_("failed to allocate memory: %m"));
if (read_all(fd, op->osrelease, st.st_size) != (ssize_t) st.st_size) {
free(op->osrelease);
op->osrelease = NULL;
goto done;
}
op->osrelease[st.st_size] = 0;
}
buf = strdup(op->osrelease);
if (!buf)
log_err(_("failed to allocate memory: %m"));
p = buf;
for (;;) {
char *eol, *eon;
p += strspn(p, "\n\r");
p += strspn(p, " \t\n\r");
if (!*p)
break;
if (strspn(p, "#;\n") != 0) {
p += strcspn(p, "\n\r");
continue;
}
if (strncmp(p, varname, varsz) != 0) {
p += strcspn(p, "\n\r");
continue;
}
p += varsz;
p += strspn(p, " \t\n\r");
if (*p != '=')
continue;
p += strspn(p, " \t\n\r=\"");
eol = p + strcspn(p, "\n\r");
*eol = '\0';
eon = eol-1;
while (eon > p) {
if (*eon == '\t' || *eon == ' ') {
eon--;
continue;
}
if (*eon == '"') {
*eon = '\0';
break;
}
break;
}
free(ret);
ret = strdup(p);
if (!ret)
log_err(_("failed to allocate memory: %m"));
p = eol + 1;
}
done:
free(buf);
if (fd >= 0)
close(fd);
return ret;
}
#ifdef AGETTY_RELOAD
static void open_netlink(void)
{
struct sockaddr_nl addr = { 0, };
int sock;
if (netlink_fd != AGETTY_RELOAD_FDNONE)
return;
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (sock >= 0) {
addr.nl_family = AF_NETLINK;
addr.nl_pid = getpid();
addr.nl_groups = netlink_groups;
if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0)
close(sock);
else
netlink_fd = sock;
}
}
static int process_netlink_msg(int *triggered)
{
char buf[4096];
struct sockaddr_nl snl;
struct nlmsghdr *h;
int rc;
struct iovec iov = {
.iov_base = buf,
.iov_len = sizeof(buf)
};
struct msghdr msg = {
.msg_name = &snl,
.msg_namelen = sizeof(snl),
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = 0
};
rc = recvmsg(netlink_fd, &msg, MSG_DONTWAIT);
if (rc < 0) {
if (errno == EWOULDBLOCK || errno == EAGAIN)
return 0;
/* Failure, just stop listening for changes */
close(netlink_fd);
netlink_fd = AGETTY_RELOAD_FDNONE;
return 0;
}
for (h = (struct nlmsghdr *)buf; NLMSG_OK(h, (unsigned int)rc); h = NLMSG_NEXT(h, rc)) {
if (h->nlmsg_type == NLMSG_DONE ||
h->nlmsg_type == NLMSG_ERROR) {
close(netlink_fd);
netlink_fd = AGETTY_RELOAD_FDNONE;
return 0;
}
*triggered = 1;
break;
}
return 1;
}
static int process_netlink(void)
{
int triggered = 0;
while (process_netlink_msg(&triggered));
return triggered;
}
static int wait_for_term_input(int fd)
{
char buffer[sizeof(struct inotify_event) + NAME_MAX + 1];
fd_set rfds;
if (inotify_fd == AGETTY_RELOAD_FDNONE) {
/* make sure the reload trigger file exists */
int reload_fd = open(AGETTY_RELOAD_FILENAME,
O_CREAT|O_CLOEXEC|O_RDONLY,
S_IRUSR|S_IWUSR);
/* initialize reload trigger inotify stuff */
if (reload_fd >= 0) {
inotify_fd = inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
if (inotify_fd > 0)
inotify_add_watch(inotify_fd, AGETTY_RELOAD_FILENAME,
IN_ATTRIB | IN_MODIFY);
close(reload_fd);
} else
log_warn(_("failed to create reload file: %s: %m"),
AGETTY_RELOAD_FILENAME);
}
while (1) {
int nfds = fd;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
if (inotify_fd >= 0) {
FD_SET(inotify_fd, &rfds);
nfds = max(nfds, inotify_fd);
}
if (netlink_fd >= 0) {
FD_SET(netlink_fd, &rfds);
nfds = max(nfds, netlink_fd);
}
/* If waiting fails, just fall through, presumably reading input will fail */
if (select(nfds + 1, &rfds, NULL, NULL, NULL) < 0)
return 1;
if (FD_ISSET(fd, &rfds)) {
return 1;
} else if (netlink_fd >= 0 && FD_ISSET(netlink_fd, &rfds)) {
if (!process_netlink())
continue;
/* Just drain the inotify buffer */
} else if (inotify_fd >= 0 && FD_ISSET(inotify_fd, &rfds)) {
while (read(inotify_fd, buffer, sizeof (buffer)) > 0);
}
return 0;
}
}
#endif /* AGETTY_RELOAD */
#ifdef ISSUEDIR_SUPPORT
static int issuedir_filter(const struct dirent *d)
{
size_t namesz;
#ifdef _DIRENT_HAVE_D_TYPE
if (d->d_type != DT_UNKNOWN && d->d_type != DT_REG &&
d->d_type != DT_LNK)
return 0;
#endif
if (*d->d_name == '.')
return 0;
namesz = strlen(d->d_name);
if (!namesz || namesz < ISSUEDIR_EXTSIZ + 1 ||
strcmp(d->d_name + (namesz - ISSUEDIR_EXTSIZ), ISSUEDIR_EXT))
return 0;
/* Accept this */
return 1;
}
static int issuefile_read_stream(struct issue *ie, FILE *f, struct options *op, struct termios *tp);
/* returns: 0 on success, 1 cannot open, <0 on error
*/
static int issuedir_read(struct issue *ie, const char *dirname,
struct options *op, struct termios *tp)
{
int dd, nfiles, i;
struct dirent **namelist = NULL;
dd = open(dirname, O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (dd < 0)
return 1;
nfiles = scandirat(dd, ".", &namelist, issuedir_filter, versionsort);
if (nfiles <= 0)
goto done;
ie->do_tcsetattr = 1;
for (i = 0; i < nfiles; i++) {
struct dirent *d = namelist[i];
FILE *f;
f = fopen_at(dd, d->d_name, O_RDONLY|O_CLOEXEC, "r" UL_CLOEXECSTR);
if (f) {
issuefile_read_stream(ie, f, op, tp);
fclose(f);
}
}
for (i = 0; i < nfiles; i++)
free(namelist[i]);
free(namelist);
done:
close(dd);
return 0;
}
#else /* !ISSUEDIR_SUPPORT */
static int issuedir_read(struct issue *ie __attribute__((__unused__)),
const char *dirname __attribute__((__unused__)),
struct options *op __attribute__((__unused__)),
struct termios *tp __attribute__((__unused__)))
{
return 1;
}
#endif /* ISSUEDIR_SUPPORT */
#ifndef ISSUE_SUPPORT
static void print_issue_file(struct issue *ie __attribute__((__unused__)),
struct options *op,
struct termios *tp __attribute__((__unused__)))
{
if ((op->flags & F_NONL) == 0) {
/* Issue not in use, start with a new line. */
write_all(STDOUT_FILENO, "\r\n", 2);
}
}
static void eval_issue_file(struct issue *ie __attribute__((__unused__)),
struct options *op __attribute__((__unused__)),
struct termios *tp __attribute__((__unused__)))
{
}
static void show_issue(struct options *op __attribute__((__unused__)))
{
}
#else /* ISSUE_SUPPORT */
static int issuefile_read_stream(
struct issue *ie, FILE *f,
struct options *op, struct termios *tp)
{
struct stat st;
int c;
if (fstat(fileno(f), &st) || !S_ISREG(st.st_mode))
return 1;
if (!ie->output) {
free(ie->mem);
ie->mem_sz = 0;
ie->mem = NULL;
ie->output = open_memstream(&ie->mem, &ie->mem_sz);
}
while ((c = getc(f)) != EOF) {
if (c == '\\')
output_special_char(ie, getc(f), op, tp, f);
else
putc(c, ie->output);
}
return 0;
}
static int issuefile_read(
struct issue *ie, const char *filename,
struct options *op, struct termios *tp)
{
FILE *f = fopen(filename, "r" UL_CLOEXECSTR);
int rc = 1;
if (f) {
rc = issuefile_read_stream(ie, f, op, tp);
fclose(f);
}
return rc;
}
#ifdef AGETTY_RELOAD
static int issue_is_changed(struct issue *ie)
{
if (ie->mem_old && ie->mem
&& strcmp(ie->mem_old, ie->mem) == 0) {
free(ie->mem_old);
ie->mem_old = ie->mem;
ie->mem = NULL;
return 0;
}
return 1;
}
#endif
static void print_issue_file(struct issue *ie,
struct options *op,
struct termios *tp)
{
int oflag = tp->c_oflag; /* Save current setting. */
if ((op->flags & F_NONL) == 0) {
/* Issue not in use, start with a new line. */
write_all(STDOUT_FILENO, "\r\n", 2);
}
if (ie->do_tcsetattr) {
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);
}
}
if (ie->mem_sz)
write_all(STDOUT_FILENO, ie->mem, ie->mem_sz);
if (ie->do_tcrestore) {
/* Restore settings. */
tp->c_oflag = oflag;
/* Wait till output is gone. */
tcsetattr(STDIN_FILENO, TCSADRAIN, tp);
}
#ifdef AGETTY_RELOAD
free(ie->mem_old);
ie->mem_old = ie->mem;
ie->mem = NULL;
ie->mem_sz = 0;
#else
free(ie->mem);
ie->mem = NULL;
ie->mem_sz = 0;
#endif
}
static void eval_issue_file(struct issue *ie,
struct options *op,
struct termios *tp)
{
int has_file = 0;
#ifdef AGETTY_RELOAD
netlink_groups = 0;
#endif
if (!(op->flags & F_ISSUE))
goto done;
/*
* The custom issue file or directory specified by: agetty -f <path>.
* Note that nothing is printed if the file/dir does not exist.
*/
if (op->issue) {
struct stat st;
if (stat(op->issue, &st) < 0)
goto done;
if (S_ISDIR(st.st_mode))
issuedir_read(ie, op->issue, op, tp);
else
issuefile_read(ie, op->issue, op, tp);
goto done;
}
/* The default /etc/issue and optional /etc/issue.d directory as
* extension to the file. The /etc/issue.d directory is ignored if
* there is no /etc/issue file. The file may be empty or symlink.
*/
if (access(_PATH_ISSUE, F_OK|R_OK) == 0) {
issuefile_read(ie, _PATH_ISSUE, op, tp);
issuedir_read(ie, _PATH_ISSUEDIR, op, tp);
goto done;
}
/* Fallback @runstatedir (usually /run) -- the file is not required to
* read the dir.
*/
if (issuefile_read(ie, _PATH_RUNSTATEDIR "/" _PATH_ISSUE_FILENAME, op, tp) == 0)
has_file++;
if (issuedir_read(ie, _PATH_RUNSTATEDIR "/" _PATH_ISSUE_DIRNAME, op, tp) == 0)
has_file++;
if (has_file)
goto done;
/* Fallback @sysconfstaticdir (usually /usr/lib) -- the file is not
* required to read the dir
*/
issuefile_read(ie, _PATH_SYSCONFSTATICDIR "/" _PATH_ISSUE_FILENAME, op, tp);
issuedir_read(ie, _PATH_SYSCONFSTATICDIR "/" _PATH_ISSUE_DIRNAME, op, tp);
done:
#ifdef AGETTY_RELOAD
if (netlink_groups != 0)
open_netlink();
#endif
if (ie->output) {
fclose(ie->output);
ie->output = NULL;
}
}
/* This is --show-issue backend, executed by normal user on the current
* terminal.
*/
static void show_issue(struct options *op)
{
struct issue ie = { .output = NULL };
struct termios tp;
memset(&tp, 0, sizeof(struct termios));
if (tcgetattr(STDIN_FILENO, &tp) < 0)
err(EXIT_FAILURE, _("failed to get terminal attributes: %m"));
eval_issue_file(&ie, op, &tp);
if (ie.mem_sz)
write_all(STDOUT_FILENO, ie.mem, ie.mem_sz);
if (ie.output)
fclose(ie.output);
free(ie.mem);
}
#endif /* ISSUE_SUPPORT */
/* Show login prompt, optionally preceded by /etc/issue contents. */
static void do_prompt(struct issue *ie, struct options *op, struct termios *tp)
{
#ifdef AGETTY_RELOAD
again:
#endif
print_issue_file(ie, op, tp);
if (op->flags & F_LOGINPAUSE) {
puts(_("[press ENTER to login]"));
#ifdef AGETTY_RELOAD
/* reload issue */
if (!wait_for_term_input(STDIN_FILENO)) {
eval_issue_file(ie, op, tp);
if (issue_is_changed(ie)) {
if (op->flags & F_VCONSOLE)
termio_clear(STDOUT_FILENO);
goto again;
}
}
#endif
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 = xgethostname();
if (hn) {
char *dot = strchr(hn, '.');
char *cn = hn;
struct addrinfo *res = NULL;
if ((op->flags & F_LONGHNAME) == 0) {
if (dot)
*dot = '\0';
} else if (dot == NULL) {
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
if (!getaddrinfo(hn, NULL, &hints, &res)
&& res && res->ai_canonname)
cn = res->ai_canonname;
}
write_all(STDOUT_FILENO, cn, strlen(cn));
write_all(STDOUT_FILENO, " ", 1);
if (res)
freeaddrinfo(res);
free(hn);
}
}
if (!op->autolog) {
/* 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 issue *ie, 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). */
INIT_CHARDATA(cp);
/*
* 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|F_UTF8));
bp = logname;
*bp = '\0';
eval_issue_file(ie, op, tp);
while (*logname == '\0') {
/* Write issue file and prompt */
do_prompt(ie, op, tp);
no_reload:
#ifdef AGETTY_RELOAD
if (!wait_for_term_input(STDIN_FILENO)) {
/* refresh prompt -- discard input data, clear terminal
* and call do_prompt() again
*/
if ((op->flags & F_VCONSOLE) == 0)
sleep(1);
eval_issue_file(ie, op, tp);
if (!issue_is_changed(ie))
goto no_reload;
tcflush(STDIN_FILENO, TCIFLUSH);
if (op->flags & F_VCONSOLE)
termio_clear(STDOUT_FILENO);
bp = logname;
*bp = '\0';
continue;
}
#endif
cp->eol = '\0';
/* Read name, watch for break and end-of-line. */
while (cp->eol == '\0') {
char key;
ssize_t readres;
debug("read from FD\n");
readres = read(STDIN_FILENO, &c, 1);
if (readres < 0) {
debug("read failed\n");
/* The terminal could be open with O_NONBLOCK when
* -L (force CLOCAL) is specified... */
if (errno == EINTR || errno == EAGAIN) {
xusleep(250000);
continue;
}
switch (errno) {
case 0:
case EIO:
case ESRCH:
case EINVAL:
case ENOENT:
exit_slowly(EXIT_SUCCESS);
default:
log_err(_("%s: read: %m"), op->tty);
}
}
if (readres == 0)
c = 0;
/* 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);
}
if (op->killchars && strchr(op->killchars, ascval))
key = CTL('U');
else if (op->erasechars && strchr(op->erasechars, ascval))
key = DEL;
else
key = ascval;
/* Do erase, kill and end-of-line processing. */
switch (key) {
case 0:
*bp = 0;
if (op->numspeed > 1 && !(op->flags & F_VCONSOLE))
return NULL;
if (readres == 0)
exit_slowly(EXIT_SUCCESS);
break;
case CR:
case NL:
*bp = 0; /* terminate logname */
cp->eol = ascval; /* set end-of-line char */
break;
case BS:
case DEL:
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'):
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 ((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;
}
/* Everything was erased. */
if (bp == logname && cp->eol == '\0')
goto no_reload;
}
}
#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 = 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;
/* fallthrough */
case 2:
/* even parity */
tp->c_cflag |= PARENB;
tp->c_iflag |= INPCK | ISTRIP;
/* fallthrough */
case (1 | 2):
/* no parity bit */
tp->c_cflag &= ~CSIZE;
tp->c_cflag |= CS7;
break;
}
/* Account for upper case without lower case. */
if (cp->capslock) {
#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: failed to set terminal attributes: %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(void)
{
FILE *out = stdout;
fputs(USAGE_HEADER, out);
fprintf(out, _(" %1$s [options] <line> [<baud_rate>,...] [<termtype>]\n"
" %1$s [options] <baud_rate>,... <line> [<termtype>]\n"), program_invocation_short_name);
fputs(USAGE_SEPARATOR, out);
fputs(_("Open a terminal and set its mode.\n"), out);
fputs(USAGE_OPTIONS, out);
fputs(_(" -8, --8bits assume 8-bit tty\n"), out);
fputs(_(" -a, --autologin <user> login the specified user automatically\n"), out);
fputs(_(" -c, --noreset do not reset control mode\n"), out);
fputs(_(" -E, --remote use -r <hostname> for login(1)\n"), out);
fputs(_(" -f, --issue-file <file> display issue file\n"), out);
fputs(_(" --show-issue display issue file and exit\n"), out);
fputs(_(" -h, --flow-control enable hardware flow control\n"), out);
fputs(_(" -H, --host <hostname> specify login host\n"), out);
fputs(_(" -i, --noissue do not display issue file\n"), out);
fputs(_(" -I, --init-string <string> set init string\n"), out);
fputs(_(" -J --noclear do not clear the screen before prompt\n"), out);
fputs(_(" -l, --login-program <file> specify login program\n"), out);
fputs(_(" -L, --local-line[=<mode>] control the local line flag\n"), out);
fputs(_(" -m, --extract-baud extract baud rate during connect\n"), out);
fputs(_(" -n, --skip-login do not prompt for login\n"), out);
fputs(_(" -N --nonewline do not print a newline before issue\n"), out);
fputs(_(" -o, --login-options <opts> options that are passed to login\n"), out);
fputs(_(" -p, --login-pause wait for any key before the login\n"), out);
fputs(_(" -r, --chroot <dir> change root to the directory\n"), out);
fputs(_(" -R, --hangup do virtually hangup on the tty\n"), out);
fputs(_(" -s, --keep-baud try to keep baud rate after break\n"), out);
fputs(_(" -t, --timeout <number> login process timeout\n"), out);
fputs(_(" -U, --detect-case detect uppercase terminal\n"), out);
fputs(_(" -w, --wait-cr wait carriage-return\n"), out);
fputs(_(" --nohints do not print hints\n"), out);
fputs(_(" --nohostname no hostname at all will be shown\n"), out);
fputs(_(" --long-hostname show full qualified hostname\n"), out);
fputs(_(" --erase-chars <string> additional backspace chars\n"), out);
fputs(_(" --kill-chars <string> additional kill chars\n"), out);
fputs(_(" --chdir <directory> chdir before the login\n"), out);
fputs(_(" --delay <number> sleep seconds before prompt\n"), out);
fputs(_(" --nice <number> run login with this priority\n"), out);
fputs(_(" --reload reload prompts on running agetty instances\n"), out);
fputs(_(" --list-speeds display supported baud rates\n"), out);
printf( " --help %s\n", USAGE_OPTSTR_HELP);
printf( " --version %s\n", USAGE_OPTSTR_VERSION);
printf(USAGE_MAN_TAIL("agetty(8)"));
exit(EXIT_SUCCESS);
}
static void list_speeds(void)
{
const struct Speedtab *sp;
for (sp = speedtab; sp->speed; sp++)
printf("%10ld\n", sp->speed);
}
/*
* 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.
*/
static void dolog(int priority
#ifndef USE_SYSLOG
__attribute__((__unused__))
#endif
, const char *fmt, va_list ap)
{
#ifdef USE_SYSLOG
/*
* 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.
*/
openlog(program_invocation_short_name, LOG_PID, LOG_AUTHPRIV);
vsyslog(priority, fmt, ap);
closelog();
#else
/*
* Write the diagnostic directly to /dev/console if we do not use
* the syslog(3) facility.
*/
char buf[BUFSIZ];
char new_fmt[BUFSIZ];
int fd;
snprintf(new_fmt, sizeof(new_fmt), "%s: %s\r\n",
program_invocation_short_name, fmt);
/* Terminate with CR-LF since the console mode is unknown. */
vsnprintf(buf, sizeof(buf), new_fmt, ap);
if ((fd = open("/dev/console", 1)) >= 0) {
write_all(fd, buf, strlen(buf));
close(fd);
}
#endif /* USE_SYSLOG */
}
static void exit_slowly(int code)
{
/* Be kind to init(8). */
sleep(10);
exit(code);
}
static void log_err(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
dolog(LOG_ERR, fmt, ap);
va_end(ap);
exit_slowly(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 print_addr(struct issue *ie, sa_family_t family, void *addr)
{
char buff[INET6_ADDRSTRLEN + 1];
inet_ntop(family, addr, buff, sizeof(buff));
fprintf(ie->output, "%s", buff);
}
/*
* Prints IP for the specified interface (@iface), if the interface is not
* specified then prints the "best" one (UP, RUNNING, non-LOOPBACK). If not
* found the "best" interface then prints at least host IP.
*/
static void output_iface_ip(struct issue *ie,
struct ifaddrs *addrs,
const char *iface,
sa_family_t family)
{
struct ifaddrs *p;
struct addrinfo hints, *info = NULL;
char *host = NULL;
void *addr = NULL;
if (!addrs)
return;
for (p = addrs; p; p = p->ifa_next) {
if (!p->ifa_name ||
!p->ifa_addr ||
p->ifa_addr->sa_family != family)
continue;
if (iface) {
/* Filter out by interface name */
if (strcmp(p->ifa_name, iface) != 0)
continue;
} else {
/* Select the "best" interface */
if ((p->ifa_flags & IFF_LOOPBACK) ||
!(p->ifa_flags & IFF_UP) ||
!(p->ifa_flags & IFF_RUNNING))
continue;
}
addr = NULL;
switch (p->ifa_addr->sa_family) {
case AF_INET:
addr = &((struct sockaddr_in *) p->ifa_addr)->sin_addr;
break;
case AF_INET6:
addr = &((struct sockaddr_in6 *) p->ifa_addr)->sin6_addr;
break;
}
if (addr) {
print_addr(ie, family, addr);
return;
}
}
if (iface)
return;
/* Hmm.. not found the best interface, print host IP at least */
memset(&hints, 0, sizeof(hints));
hints.ai_family = family;
if (family == AF_INET6)
hints.ai_flags = AI_V4MAPPED;
host = xgethostname();
if (host && getaddrinfo(host, NULL, &hints, &info) == 0 && info) {
switch (info->ai_family) {
case AF_INET:
addr = &((struct sockaddr_in *) info->ai_addr)->sin_addr;
break;
case AF_INET6:
addr = &((struct sockaddr_in6 *) info->ai_addr)->sin6_addr;
break;
}
if (addr)
print_addr(ie, family, addr);
freeaddrinfo(info);
}
free(host);
}
/*
* parses \x{argument}, if not argument specified then returns NULL, the @fd
* has to point to one char after the sequence (it means '{').
*/
static char *get_escape_argument(FILE *fd, char *buf, size_t bufsz)
{
size_t i = 0;
int c = fgetc(fd);
if (c == EOF || (unsigned char) c != '{') {
ungetc(c, fd);
return NULL;
}
do {