summaryrefslogtreecommitdiff
path: root/src/pinky.c
blob: 42150929d4c7a5b489b0e3c59122d2932785d65d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
/* GNU's pinky.
   Copyright (C) 1992-1997, 1999, 2000 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.  */

/* Created by hacking who.c by Kaveh Ghazi ghazi@caip.rutgers.edu */

#include <config.h>
#include <getopt.h>
#include <pwd.h>
#include <stdio.h>

#include "system.h"
#include "error.h"
#include "readutmp.h"

/* The official name of this program (e.g., no `g' prefix).  */
#define PROGRAM_NAME "pinky"

#define AUTHORS "Joseph Arceneaux, David MacKenzie, and Kaveh Ghazi"

#ifndef MAXHOSTNAMELEN
# define MAXHOSTNAMELEN 64
#endif

#ifndef S_IWGRP
# define S_IWGRP 020
#endif

int gethostname ();
char *ttyname ();

/* The name this program was run with. */
const char *program_name;

/* If nonzero, display the hours:minutes since each user has touched
   the keyboard, or blank if within the last minute, or days followed
   by a 'd' if not within the last day. */
static int include_idle = 1;

/* If nonzero, display a line at the top describing each field. */
static int include_heading = 1;

/* if nonzero, display the user's full name from pw_gecos. */
static int include_fullname = 1;

/* if nonzero, display the user's ~/.project file when doing long format. */
static int include_project = 1;

/* if nonzero, display the user's ~/.plan file when doing long format. */
static int include_plan = 1;

/* if nonzero, display the user's home directory and shell
   when doing long format. */
static int include_home_and_shell = 1;

/* if nonzero, use the "short" output format. */
static int do_short_format = 1;

/* if nonzero, display the ut_host field. */
#ifdef HAVE_UT_HOST
static int include_where = 1;
#endif

static struct option const longopts[] =
{
  {GETOPT_HELP_OPTION_DECL},
  {GETOPT_VERSION_OPTION_DECL},
  {NULL, 0, NULL, 0}
};

/* Count and return the number of ampersands in STR.  */

static int
count_ampersands (const char *str)
{
  int count = 0;
  do
    {
      if (*str == '&')
	count++;
    } while (*str++);
  return count;
}

/* Create a string (via xmalloc) which contains a full name by substituting
   for each ampersand in GECOS_NAME the USER_NAME string with its first
   character capitalized.  The caller must ensure that GECOS_NAME contains
   no `,'s.  The caller also is responsible for free'ing the return value of
   this function.  */

static char *
create_fullname (const char *gecos_name, const char *user_name)
{
  const int result_len = strlen (gecos_name)
    + count_ampersands (gecos_name) * (strlen (user_name) - 1) + 1;
  char *const result = xmalloc (result_len);
  char *r = result;

  while (*gecos_name)
    {
      if (*gecos_name == '&')
	{
	  const char *uname = user_name;
	  if (ISLOWER (*uname))
	    *r++ = TOUPPER (*uname++);
	  while (*uname)
	    *r++ = *uname++;
	}
      else
	{
	  *r++ = *gecos_name;
	}

      gecos_name++;
    }
  *r = 0;

  return result;
}

/* 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_hhmm[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_hhmm, "%02d:%02d",
	       (int) (seconds_idle / (60 * 60)),
	       (int) ((seconds_idle % (60 * 60)) / 60));
      return (const char *) idle_hhmm;
    }
  sprintf (idle_hhmm, "%dd", (int) (seconds_idle / (24 * 60 * 60)));
  return (const char *) idle_hhmm;
}

/* Display a line of information about UTMP_ENT. */

static void
print_entry (const STRUCT_UTMP *utmp_ent)
{
  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 (utmp_ent->ut_line) + DEV_DIR_LEN + 1];
  time_t tm;

  /* 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 (utmp_ent->ut_line[0] == '/')
    {
      strncpy (line, utmp_ent->ut_line, sizeof (utmp_ent->ut_line));
      line[sizeof (utmp_ent->ut_line)] = '\0';
    }
  else
    {
      strcpy (line, DEV_DIR_WITH_TRAILING_SLASH);
      strncpy (line + DEV_DIR_LEN, utmp_ent->ut_line, sizeof (utmp_ent->ut_line));
      line[DEV_DIR_LEN + sizeof (utmp_ent->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 (UT_USER (utmp_ent)), UT_USER (utmp_ent));

  if (include_fullname)
    {
      struct passwd *pw;
      char name[sizeof (UT_USER (utmp_ent)) + 1];

      strncpy (name, UT_USER (utmp_ent), sizeof (UT_USER (utmp_ent)));
      name[sizeof (UT_USER (utmp_ent))] = '\0';
      pw = getpwnam (name);
      if (pw == NULL)
	printf (" %19s", "        ???");
      else
	{
	  char *const comma = strchr (pw->pw_gecos, ',');
	  char *result;

	  if (comma)
	    *comma = '\0';

	  result = create_fullname (pw->pw_gecos, pw->pw_name);
	  printf (" %-19.19s", result);
	  free (result);
	}
    }

  printf (" %c%-8.*s",
	  mesg, (int) sizeof (utmp_ent->ut_line), utmp_ent->ut_line);

  if (include_idle)
    {
      if (last_change)
	printf (" %-6s", idle_string (last_change));
      else
	printf (" %-6s", "???");
    }

  /* Don't take the address of UT_TIME_MEMBER directly.
     Ulrich Drepper wrote:
     ``... GNU libc (and perhaps other libcs as well) have extended
     utmp file formats which do not use a simple time_t ut_time field.
     In glibc, ut_time is a macro which selects for backward compatibility
     the tv_sec member of a struct timeval value.''  */
  tm = UT_TIME_MEMBER (utmp_ent);
  printf (" %-12.12s", ctime (&tm) + 4);

#ifdef HAVE_UT_HOST
  if (include_where && utmp_ent->ut_host[0])
    {
      extern char *canon_host ();
      char ut_host[sizeof (utmp_ent->ut_host) + 1];
      char *host = 0, *display = 0;

      /* Copy the host name into UT_HOST, and ensure it's nul terminated. */
      strncpy (ut_host, utmp_ent->ut_host, (int) sizeof (utmp_ent->ut_host));
      ut_host[sizeof (utmp_ent->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');
}

/* Display a verbose line of information about UTMP_ENT. */

static void
print_long_entry (const char name[])
{
  struct passwd *pw;

  pw = getpwnam (name);

  printf (_("Login name: "));
  printf ("%-28s", name);

  printf (_("In real life: "));
  if (pw == NULL)
    {
      printf (" %s", _("???\n"));
      return;
    }
  else
    {
      char *const comma = strchr (pw->pw_gecos, ',');
      char *result;

      if (comma)
	*comma = '\0';

      result = create_fullname (pw->pw_gecos, pw->pw_name);
      printf (" %s", result);
      free (result);
    }

  putchar ('\n');

  if (include_home_and_shell)
    {
      printf (_("Directory: "));
      printf ("%-29s", pw->pw_dir);
      printf (_("Shell: "));
      printf (" %s", pw->pw_shell);
      putchar ('\n');
    }

  if (include_project)
    {
      FILE *stream;
      char buf[1024];
      const char *const baseproject = "/.project";
      char *const project =
      xmalloc (strlen (pw->pw_dir) + strlen (baseproject) + 1);

      strcpy (project, pw->pw_dir);
      strcat (project, baseproject);

      stream = fopen (project, "r");
      if (stream)
	{
	  int bytes;

	  printf (_("Project: "));

	  while ((bytes = fread (buf, 1, sizeof (buf), stream)) > 0)
	    fwrite (buf, 1, bytes, stdout);
	  fclose (stream);
	}

      free (project);
    }

  if (include_plan)
    {
      FILE *stream;
      char buf[1024];
      const char *const baseplan = "/.plan";
      char *const plan =
      xmalloc (strlen (pw->pw_dir) + strlen (baseplan) + 1);

      strcpy (plan, pw->pw_dir);
      strcat (plan, baseplan);

      stream = fopen (plan, "r");
      if (stream)
	{
	  int bytes;

	  printf (_("Plan:\n"));

	  while ((bytes = fread (buf, 1, sizeof (buf), stream)) > 0)
	    fwrite (buf, 1, bytes, stdout);
	  fclose (stream);
	}

      free (plan);
    }

  putchar ('\n');
}

/* Print the username of each valid entry and the number of valid entries
   in UTMP_BUF, which should have N elements. */

static void
print_heading (void)
{
  printf ("%-8s", _("Login"));
  if (include_fullname)
    printf (" %-19s", _("   Name"));
  printf (" %-9s", _("TTY"));
  if (include_idle)
    printf (" %-6s", _("Idle"));
  printf (" %-12s", _("When"));
#ifdef HAVE_UT_HOST
  if (include_where)
    printf (" %s", _("Where"));
#endif
  putchar ('\n');
}

/* Display UTMP_BUF, which should have N entries. */

static void
scan_entries (int n, const STRUCT_UTMP *utmp_buf,
	      const int argc_names, char *const argv_names[])
{
  if (include_heading)
    print_heading ();

  while (n--)
    {
      if (UT_USER (utmp_buf)[0]
#ifdef USER_PROCESS
	  && utmp_buf->ut_type == USER_PROCESS
#endif
	)
	{
	  if (argc_names)
	    {
	      int i;

	      for (i = 0; i < argc_names; i++)
		if (strncmp (UT_USER (utmp_buf), argv_names[i],
			     sizeof (UT_USER (utmp_buf))) == 0)
		  {
		    print_entry (utmp_buf);
		    break;
		  }
	    }
	  else
	    print_entry (utmp_buf);
	}
      utmp_buf++;
    }
}

/* Display a list of who is on the system, according to utmp file FILENAME. */

static void
short_pinky (const char *filename,
	     const int argc_names, char *const argv_names[])
{
  int n_users;
  STRUCT_UTMP *utmp_buf;
  int fail = read_utmp (filename, &n_users, &utmp_buf);

  if (fail)
    error (1, errno, "%s", filename);

  scan_entries (n_users, utmp_buf, argc_names, argv_names);
}

static void
long_pinky (const int argc_names, char *const argv_names[])
{
  int i;

  for (i = 0; i < argc_names; i++)
    print_long_entry (argv_names[i]);
}

void
usage (int status)
{
  if (status != 0)
    fprintf (stderr, _("Try `%s --help' for more information.\n"),
	     program_name);
  else
    {
      printf (_("Usage: %s [OPTION]... [USER]...\n"), program_name);
      printf (_("\
\n\
  -l              do long format output\n\
  -b              omit the user's home directory and shell in long format\n\
  -h              omit the user's project file in long format\n\
  -p              omit the user's plan file in long format\n\
  -s              do short format output, this is the default\n\
  -f              omit the line of column headings in short format\n\
  -w              omit the user's full name in short format\n\
  -i              omit the user's full name and remote host in short format\n\
  -q              omit the user's full name, remote host and idle time\n\
                  in short format\n\
      --help      display this help and exit\n\
      --version   output version information and exit\n\
\n\
A lightweight `finger' program;  print user information.\n\
The utmp file will be %s.\n\
"), UTMP_FILE);
      puts (_("\nReport bugs to <bug-sh-utils@gnu.org>."));
    }
  exit (status);
}

int
main (int argc, char **argv)
{
  int optc, longind;

  program_name = argv[0];
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  while ((optc = getopt_long (argc, argv, "sfwiqbhlp", longopts, &longind))
	 != -1)
    {
      switch (optc)
	{
	case 0:
	  break;

	case 's':
	  do_short_format = 1;
	  break;

	case 'l':
	  do_short_format = 0;
	  break;

	case 'f':
	  include_heading = 0;
	  break;

	case 'w':
	  include_fullname = 0;
	  break;

	case 'i':
	  include_fullname = 0;
#ifdef HAVE_UT_HOST
	  include_where = 0;
#endif
	  break;

	case 'q':
	  include_fullname = 0;
#ifdef HAVE_UT_HOST
	  include_where = 0;
#endif
	  include_idle = 0;
	  break;

	case 'h':
	  include_project = 0;
	  break;

	case 'p':
	  include_plan = 0;
	  break;

	case 'b':
	  include_home_and_shell = 0;
	  break;

	case_GETOPT_HELP_CHAR;

	case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);

	default:
	  usage (1);
	}
    }

  if (do_short_format)
    short_pinky (UTMP_FILE, argc - optind, argv + optind);
  else
    long_pinky (argc - optind, argv + optind);

  exit (0);
}