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-rw-r--r--src/who-users.c654
1 files changed, 654 insertions, 0 deletions
diff --git a/src/who-users.c b/src/who-users.c
new file mode 100644
index 000000000..cb0125fd8
--- /dev/null
+++ b/src/who-users.c
@@ -0,0 +1,654 @@
+/* GNU's users/who.
+ Copyright (C) 92, 93, 94, 1995 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., 675 Mass Ave, Cambridge, MA 02139, 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 <config.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+#ifdef HAVE_UTMPX_H
+#include <utmpx.h>
+#define STRUCT_UTMP struct utmpx
+#else
+#include <utmp.h>
+#define STRUCT_UTMP struct utmp
+#endif
+
+#include <time.h>
+#include <getopt.h>
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
+#include "system.h"
+#include "version.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
+ error You must define one of WHO and USERS.
+#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;
+
+#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 (when)
+ 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 (this)
+ 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);
+
+#ifdef HAVE_UTMPX_H
+ printf (" %-12.12s", ctime (&this->ut_tv.tv_sec) + 4);
+#else
+ printf (" %-12.12s", ctime (&this->ut_time) + 4);
+#endif
+
+ if (include_idle)
+ {
+ if (last_change)
+ printf (" %s", idle_string (last_change));
+ else
+ printf (" . ");
+ }
+#ifdef HAVE_UT_HOST
+ if (this->ut_host[0])
+ printf (" (%-.*s)", (int) sizeof (this->ut_host), this->ut_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 (n)
+ 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 (v_a, v_b)
+ 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 (n)
+ 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 ()
+{
+ 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 (n)
+ 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 (filename)
+ char *filename;
+{
+ FILE *utmp;
+ struct stat file_stats;
+ int 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 (filename)
+ 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);
+#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 (n, line)
+ 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 (filename)
+ 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 (status)
+ 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\
+"));
+ }
+ exit (status);
+}
+#endif /* WHO */
+
+#ifdef USERS
+static void
+usage (status)
+ 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"));
+ }
+ exit (status);
+}
+#endif /* USERS */
+
+void
+main (argc, argv)
+ int argc;
+ char **argv;
+{
+ int optc, longind;
+#ifdef WHO
+ int my_line_only = 0;
+#endif /* WHO */
+
+ program_name = argv[0];
+
+#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:
+ error (0, 0, _("too many arguments"));
+ usage (1);
+ }
+ }
+
+ if (show_version)
+ {
+ printf ("%s - %s\n", COMMAND_NAME, version_string);
+ 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 <utmp file> */
+#ifdef WHO
+ if (my_line_only)
+ who_am_i (argv[optind]);
+ else
+#endif /* WHO */
+ who (argv[optind]);
+ break;
+
+#ifdef WHO
+ case 2: /* who <blurf> <glop> */
+ who_am_i (UTMP_FILE);
+ break;
+#endif /* WHO */
+
+ default: /* lose */
+ usage (1);
+ }
+
+ exit (0);
+}
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