/* GNU's uptime/users/who. Copyright (C) 92, 93, 94, 95, 1996 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Written by jla; revised by djm */ /* Output format: name [state] line time [idle] host state: -T name, line, time: not -q idle: -u Options: -m Same as 'who am i', for POSIX. -q Only user names and # logged on; overrides all other options. -s Name, line, time (default). -i, -u Idle hours and minutes; '.' means active in last minute; 'old' means idle for >24 hours. -H Print column headings at top. -w, -T -s plus mesg (+ or -, or ? if bad line). */ #include #include #include #ifdef HAVE_UTMPX_H # include # define STRUCT_UTMP struct utmpx # define UT_TIME_MEMBER(UT_PTR) ((UT_PTR)->ut_tv.tv_sec) #else # include # define STRUCT_UTMP struct utmp # define UT_TIME_MEMBER(UT_PTR) ((UT_PTR)->ut_time) #endif #include #include #ifdef HAVE_SYS_PARAM_H #include #endif #include "system.h" #include "error.h" #if !defined (UTMP_FILE) && defined (_PATH_UTMP) /* 4.4BSD. */ #define UTMP_FILE _PATH_UTMP #endif #if defined (UTMPX_FILE) /* Solaris, SysVr4 */ #undef UTMP_FILE #define UTMP_FILE UTMPX_FILE #endif #ifndef UTMP_FILE #define UTMP_FILE "/etc/utmp" #endif #ifndef MAXHOSTNAMELEN #define MAXHOSTNAMELEN 64 #endif #ifndef S_IWGRP #define S_IWGRP 020 #endif #ifdef WHO #define COMMAND_NAME "who" #else #ifdef USERS #define COMMAND_NAME "users" #else #ifdef UPTIME #define COMMAND_NAME "uptime" #else error You must define one of WHO, UPTIME or USERS. #endif /* UPTIME */ #endif /* USERS */ #endif /* WHO */ int gethostname (); char *ttyname (); char *xmalloc (); /* The name this program was run with. */ char *program_name; /* If nonzero, display usage information and exit. */ static int show_help; /* If nonzero, print the version on standard output and exit. */ static int show_version; #ifdef WHO /* If nonzero, display only a list of usernames and count of the users logged on. Ignored for `who am i'. */ static int short_list; /* If nonzero, display the hours:minutes since each user has touched the keyboard, or "." if within the last minute, or "old" if not within the last day. */ static int include_idle; /* If nonzero, display a line at the top describing each field. */ static int include_heading; /* If nonzero, display a `+' for each user if mesg y, a `-' if mesg n, or a `?' if their tty cannot be statted. */ static int include_mesg; #endif /* WHO */ static struct option const longopts[] = { #ifdef WHO {"count", no_argument, NULL, 'q'}, {"idle", no_argument, NULL, 'u'}, {"heading", no_argument, NULL, 'H'}, {"message", no_argument, NULL, 'T'}, {"mesg", no_argument, NULL, 'T'}, {"writable", no_argument, NULL, 'T'}, #endif /* WHO */ {"help", no_argument, &show_help, 1}, {"version", no_argument, &show_version, 1}, {NULL, 0, NULL, 0} }; static STRUCT_UTMP *utmp_contents; #ifdef UPTIME static void print_uptime (int n) { register STRUCT_UTMP *this = utmp_contents; register int entries = 0; time_t boot_time = 0; time_t time_now; time_t uptime = 0; int updays; int uphours; int upmins; struct tm *tmn; double avg[3]; int loads; #ifdef HAVE_PROC_UPTIME FILE *fp; double upsecs; fp = fopen ("/proc/uptime", "r"); if (fp != NULL) { char buf[BUFSIZ]; int res; fgets(buf, BUFSIZ, fp); res = sscanf (buf, "%lf", &upsecs); if (res == 1) uptime = (time_t) upsecs; fclose (fp); } #endif /* HAVE_PROC_UPTIME */ /* Loop through all the utmp entries we just read and count up the valid ones, also in the process possibly gleaning boottime. */ while (n--) { if (this->ut_name[0] #ifdef USER_PROCESS && this->ut_type == USER_PROCESS #endif ) { ++entries; } /* If BOOT_MSG is defined, we can get boottime from utmp. This avoids possibly needing special privs to read /dev/kmem. */ #ifdef BOOT_MSG # if HAVE_PROC_UPTIME if (uptime == 0) # endif /* HAVE_PROC_UPTIME */ if (!strcmp (this->ut_line, BOOT_MSG)) boot_time = UT_TIME_MEMBER (this); #endif /* BOOT_MSG */ ++this; } time_now = time (0); #if defined HAVE_PROC_UPTIME if (uptime == 0) #endif { if (boot_time == 0) error (1, errno, _("couldn't get boot time")); uptime = time_now - boot_time; } updays = uptime / 86400; uphours = (uptime - (updays * 86400)) / 3600; upmins = (uptime - (updays * 86400) - (uphours * 3600)) / 60; tmn = localtime (&time_now); printf (_(" %2d:%02d%s up "), ((tmn->tm_hour % 12) == 0 ? 12 : tmn->tm_hour % 12), tmn->tm_min, (tmn->tm_hour < 12 ? _("am") : _("pm"))); if (updays > 0) printf ("%d %s,", updays, (updays == 1 ? _("day") : _("days"))); printf (" %2d:%02d, %d %s", uphours, upmins, entries, (entries == 1) ? _("user") : _("users")); #if defined (HAVE_GETLOADAVG) || defined (C_GETLOADAVG) loads = getloadavg (avg, 3); #else loads = -1; #endif if (loads == -1) putchar ('\n'); else { if (loads > 0) printf (_(", load average: %.2f"), avg[0]); if (loads > 1) printf (", %.2f", avg[1]); if (loads > 2) printf (", %.2f", avg[2]); if (loads > 0) putchar ('\n'); } } #endif /* UPTIME */ #if defined (WHO) || defined (USERS) /* Copy UT->ut_name into storage obtained from malloc. Then remove any trailing spaces from the copy, NUL terminate it, and return the copy. */ static char * extract_trimmed_name (const STRUCT_UTMP *ut) { char *p, *trimmed_name; trimmed_name = xmalloc (sizeof (ut->ut_name) + 1); strncpy (trimmed_name, ut->ut_name, sizeof (ut->ut_name)); /* Append a trailing space character. Some systems pad names shorter than the maximum with spaces, others pad with NULs. Remove any spaces. */ trimmed_name[sizeof (ut->ut_name)] = ' '; p = strchr (trimmed_name, ' '); if (p != NULL) *p = '\0'; return trimmed_name; } #endif /* WHO || USERS */ #if WHO /* Return a string representing the time between WHEN and the time that this function is first run. */ static const char * idle_string (time_t when) { static time_t now = 0; static char idle[10]; time_t seconds_idle; if (now == 0) time (&now); seconds_idle = now - when; if (seconds_idle < 60) /* One minute. */ return " . "; if (seconds_idle < (24 * 60 * 60)) /* One day. */ { sprintf (idle, "%02d:%02d", (int) (seconds_idle / (60 * 60)), (int) ((seconds_idle % (60 * 60)) / 60)); return (const char *) idle; } return _(" old "); } /* Display a line of information about entry THIS. */ static void print_entry (STRUCT_UTMP *this) { struct stat stats; time_t last_change; char mesg; #define DEV_DIR_WITH_TRAILING_SLASH "/dev/" #define DEV_DIR_LEN (sizeof (DEV_DIR_WITH_TRAILING_SLASH) - 1) char line[sizeof (this->ut_line) + DEV_DIR_LEN + 1]; /* Copy ut_line into LINE, prepending `/dev/' if ut_line is not already an absolute pathname. Some system may put the full, absolute pathname in ut_line. */ if (this->ut_line[0] == '/') { strncpy (line, this->ut_line, sizeof (this->ut_line)); line[sizeof (this->ut_line)] = '\0'; } else { strcpy (line, DEV_DIR_WITH_TRAILING_SLASH); strncpy (line + DEV_DIR_LEN, this->ut_line, sizeof (this->ut_line)); line[DEV_DIR_LEN + sizeof (this->ut_line)] = '\0'; } if (stat (line, &stats) == 0) { mesg = (stats.st_mode & S_IWGRP) ? '+' : '-'; last_change = stats.st_atime; } else { mesg = '?'; last_change = 0; } printf ("%-8.*s", (int) sizeof (this->ut_name), this->ut_name); if (include_mesg) printf (" %c ", mesg); printf (" %-8.*s", (int) sizeof (this->ut_line), this->ut_line); printf (" %-12.12s", ctime (&UT_TIME_MEMBER (this)) + 4); if (include_idle) { if (last_change) printf (" %s", idle_string (last_change)); else printf (" . "); } #ifdef HAVE_UT_HOST if (this->ut_host[0]) { extern char *canon_host (); char ut_host[sizeof (this->ut_host) + 1]; char *host = 0, *display = 0; /* Copy the host name into UT_HOST, and ensure it's nul terminated. */ strncpy (ut_host, this->ut_host, (int) sizeof (this->ut_host)); ut_host[sizeof (this->ut_host)] = '\0'; /* Look for an X display. */ display = strrchr (ut_host, ':'); if (display) *display++ = '\0'; if (*ut_host) /* See if we can canonicalize it. */ host = canon_host (ut_host); if (! host) host = ut_host; if (display) printf (" (%s:%s)", host, display); else printf (" (%s)", host); } #endif putchar ('\n'); } /* Print the username of each valid entry and the number of valid entries in `utmp_contents', which should have N elements. */ static void list_entries_who (int n) { register STRUCT_UTMP *this = utmp_contents; int entries; entries = 0; while (n--) { if (this->ut_name[0] #ifdef USER_PROCESS && this->ut_type == USER_PROCESS #endif ) { char *trimmed_name; trimmed_name = extract_trimmed_name (this); printf ("%s ", trimmed_name); free (trimmed_name); entries++; } this++; } printf (_("\n# users=%u\n"), entries); } #endif /* WHO */ #ifdef USERS static int userid_compare (const void *v_a, const void *v_b) { char **a = (char **) v_a; char **b = (char **) v_b; return strcmp (*a, *b); } static void list_entries_users (int n) { register STRUCT_UTMP *this = utmp_contents; char **u; int i; int n_entries; n_entries = 0; u = (char **) xmalloc (n * sizeof (u[0])); for (i = 0; i < n; i++) { if (this->ut_name[0] #ifdef USER_PROCESS && this->ut_type == USER_PROCESS #endif ) { char *trimmed_name; trimmed_name = extract_trimmed_name (this); u[n_entries] = trimmed_name; ++n_entries; } this++; } qsort (u, n_entries, sizeof (u[0]), userid_compare); for (i = 0; i < n_entries; i++) { int c; fputs (u[i], stdout); c = (i < n_entries-1 ? ' ' : '\n'); putchar (c); } for (i = 0; i < n_entries; i++) free (u[i]); free (u); } #endif /* USERS */ #ifdef WHO static void print_heading (void) { printf ("%-8s ", _("USER")); if (include_mesg) printf (_("MESG ")); printf ("%-8s ", _("LINE")); printf (_("LOGIN-TIME ")); if (include_idle) printf (_("IDLE ")); printf (_("FROM\n")); } /* Display `utmp_contents', which should have N entries. */ static void scan_entries (int n) { register STRUCT_UTMP *this = utmp_contents; if (include_heading) print_heading (); while (n--) { if (this->ut_name[0] #ifdef USER_PROCESS && this->ut_type == USER_PROCESS #endif ) print_entry (this); this++; } } #endif /* WHO */ /* Read the utmp file FILENAME into UTMP_CONTENTS and return the number of entries it contains. */ static int read_utmp (char *filename) { FILE *utmp; struct stat file_stats; size_t n_read; size_t size; utmp = fopen (filename, "r"); if (utmp == NULL) error (1, errno, "%s", filename); fstat (fileno (utmp), &file_stats); size = file_stats.st_size; if (size > 0) utmp_contents = (STRUCT_UTMP *) xmalloc (size); else { fclose (utmp); return 0; } /* Use < instead of != in case the utmp just grew. */ n_read = fread (utmp_contents, 1, size, utmp); if (ferror (utmp) || fclose (utmp) == EOF || n_read < size) error (1, errno, "%s", filename); return size / sizeof (STRUCT_UTMP); } /* Display a list of who is on the system, according to utmp file FILENAME. */ static void who (char *filename) { int users; users = read_utmp (filename); #ifdef WHO if (short_list) list_entries_who (users); else scan_entries (users); #else #ifdef USERS list_entries_users (users); #else #ifdef UPTIME print_uptime (users); #endif /* UPTIME */ #endif /* USERS */ #endif /* WHO */ } #ifdef WHO /* Search `utmp_contents', which should have N entries, for an entry with a `ut_line' field identical to LINE. Return the first matching entry found, or NULL if there is no matching entry. */ static STRUCT_UTMP * search_entries (int n, char *line) { register STRUCT_UTMP *this = utmp_contents; while (n--) { if (this->ut_name[0] #ifdef USER_PROCESS && this->ut_type == USER_PROCESS #endif && !strncmp (line, this->ut_line, sizeof (this->ut_line))) return this; this++; } return NULL; } /* Display the entry in utmp file FILENAME for this tty on standard input, or nothing if there is no entry for it. */ static void who_am_i (char *filename) { register STRUCT_UTMP *utmp_entry; char hostname[MAXHOSTNAMELEN + 1]; char *tty; if (gethostname (hostname, MAXHOSTNAMELEN + 1)) *hostname = 0; if (include_heading) { printf ("%*s ", (int) strlen (hostname), " "); print_heading (); } tty = ttyname (0); if (tty == NULL) return; tty += 5; /* Remove "/dev/". */ utmp_entry = search_entries (read_utmp (filename), tty); if (utmp_entry == NULL) return; printf ("%s!", hostname); print_entry (utmp_entry); } static void usage (int status) { if (status != 0) fprintf (stderr, _("Try `%s --help' for more information.\n"), program_name); else { printf (_("Usage: %s [OPTION]... [ FILE | ARG1 ARG2 ]\n"), program_name); printf (_("\ \n\ -H, --heading print line of column headings\n\ -T, -w, --mesg add user's message status as +, - or ?\n\ -i, -u, --idle add user idle time as HOURS:MINUTES, . or old\n\ -m only hostname and user associated with stdin\n\ -q, --count all login names and number of users logged on\n\ -s (ignored)\n\ --help display this help and exit\n\ --message same as -T\n\ --version output version information and exit\n\ --writeable same as -T\n\ \n\ If FILE not given, uses /etc/utmp. /etc/wtmp as FILE is common.\n\ If ARG1 ARG2 given, -m presumed: `am i' or `mom likes' are usual.\n\ ")); puts (_("\nReport bugs to bug-gnu-utils@gnu.ai.mit.edu")); } exit (status); } #endif /* WHO */ #if defined(USERS) || defined(UPTIME) static void usage (int status) { if (status != 0) fprintf (stderr, _("Try `%s --help' for more information.\n"), program_name); else { printf (_("Usage: %s [OPTION]... [ FILE ]\n"), program_name); printf (_("\ Output who is currently logged in according to FILE.\n\ If FILE not given, uses /etc/utmp. /etc/wtmp as FILE is common.\n\ \n\ --help display this help and exit\n\ --version output version information and exit\n")); puts (_("\nReport bugs to bug-gnu-utils@gnu.ai.mit.edu")); } exit (status); } #endif /* USERS || UPTIME */ int main (int argc, char **argv) { int optc, longind; #ifdef WHO int my_line_only = 0; #endif /* WHO */ program_name = argv[0]; setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); #ifdef WHO while ((optc = getopt_long (argc, argv, "imqsuwHT", longopts, &longind)) #else while ((optc = getopt_long (argc, argv, "", longopts, &longind)) #endif /* WHO */ != EOF) { switch (optc) { case 0: break; #ifdef WHO case 'm': my_line_only = 1; break; case 'q': short_list = 1; break; case 's': break; case 'i': case 'u': include_idle = 1; break; case 'H': include_heading = 1; break; case 'w': case 'T': include_mesg = 1; break; #endif /* WHO */ default: usage (1); } } if (show_version) { printf ("%s (%s) %s\n", COMMAND_NAME, GNU_PACKAGE, VERSION); exit (0); } if (show_help) usage (0); switch (argc - optind) { case 0: /* who */ #ifdef WHO if (my_line_only) who_am_i (UTMP_FILE); else #endif /* WHO */ who (UTMP_FILE); break; case 1: /* who */ #ifdef WHO if (my_line_only) who_am_i (argv[optind]); else #endif /* WHO */ who (argv[optind]); break; #ifdef WHO case 2: /* who */ who_am_i (UTMP_FILE); break; #endif /* WHO */ default: /* lose */ error (0, 0, _("too many arguments")); usage (1); } exit (0); }