src/pinky.c

   1 /* GNU's pinky.
   2    Copyright (C) 1992-1997, 1999-2006 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 /* Created by hacking who.c by Kaveh Ghazi ghazi@caip.rutgers.edu */
  19
  20 #include <config.h>
  21 #include <getopt.h>
  22 #include <pwd.h>
  23 #include <stdio.h>
  24
  25 #include <sys/types.h>
  26 #include "system.h"
  27
  28 #include "canon-host.h"
  29 #include "error.h"
  30 #include "hard-locale.h"
  31 #include "inttostr.h"
  32 #include "readutmp.h"
  33
  34 /* The official name of this program (e.g., no `g' prefix).  */
  35 #define PROGRAM_NAME "pinky"
  36
  37 #define AUTHORS "Joseph Arceneaux", "David MacKenzie", "Kaveh Ghazi"
  38
  39 #ifndef MAXHOSTNAMELEN
  40 # define MAXHOSTNAMELEN 64
  41 #endif
  42
  43 char *ttyname ();
  44
  45 /* The name this program was run with. */
  46 const char *program_name;
  47
  48 /* If true, display the hours:minutes since each user has touched
  49    the keyboard, or blank if within the last minute, or days followed
  50    by a 'd' if not within the last day. */
  51 static bool include_idle = true;
  52
  53 /* If true, display a line at the top describing each field. */
  54 static bool include_heading = true;
  55
  56 /* if true, display the user's full name from pw_gecos. */
  57 static bool include_fullname = true;
  58
  59 /* if true, display the user's ~/.project file when doing long format. */
  60 static bool include_project = true;
  61
  62 /* if true, display the user's ~/.plan file when doing long format. */
  63 static bool include_plan = true;
  64
  65 /* if true, display the user's home directory and shell
  66    when doing long format. */
  67 static bool include_home_and_shell = true;
  68
  69 /* if true, use the "short" output format. */
  70 static bool do_short_format = true;
  71
  72 /* if true, display the ut_host field. */
  73 #ifdef HAVE_UT_HOST
  74 static bool include_where = true;
  75 #endif
  76
  77 /* The strftime format to use for login times, and its expected
  78    output width.  */
  79 static char const *time_format;
  80 static int time_format_width;
  81
  82 static struct option const longopts[] =
  83 {
  84   {GETOPT_HELP_OPTION_DECL},
  85   {GETOPT_VERSION_OPTION_DECL},
  86   {NULL, 0, NULL, 0}
  87 };
  88
  89 /* Count and return the number of ampersands in STR.  */
  90
  91 static size_t
  92 count_ampersands (const char *str)
  93 {
  94   size_t count = 0;
  95   do
  96     {
  97       if (*str == '&')
  98         count++;
  99     } while (*str++);
 100   return count;
 101 }
 102
 103 /* Create a string (via xmalloc) which contains a full name by substituting
 104    for each ampersand in GECOS_NAME the USER_NAME string with its first
 105    character capitalized.  The caller must ensure that GECOS_NAME contains
 106    no `,'s.  The caller also is responsible for free'ing the return value of
 107    this function.  */
 108
 109 static char *
 110 create_fullname (const char *gecos_name, const char *user_name)
 111 {
 112   size_t rsize = strlen (gecos_name) + 1;
 113   char *result;
 114   char *r;
 115   size_t ampersands = count_ampersands (gecos_name);
 116
 117   if (ampersands != 0)
 118     {
 119       size_t ulen = strlen (user_name);
 120       size_t product = ampersands * ulen;
 121       rsize += product - ampersands;
 122       if (xalloc_oversized (ulen, ampersands) || rsize < product)
 123         xalloc_die ();
 124     }
 125
 126   r = result = xmalloc (rsize);
 127
 128   while (*gecos_name)
 129     {
 130       if (*gecos_name == '&')
 131         {
 132           const char *uname = user_name;
 133           if (islower (to_uchar (*uname)))
 134             *r++ = toupper (to_uchar (*uname++));
 135           while (*uname)
 136             *r++ = *uname++;
 137         }
 138       else
 139         {
 140           *r++ = *gecos_name;
 141         }
 142
 143       gecos_name++;
 144     }
 145   *r = 0;
 146
 147   return result;
 148 }
 149
 150 /* Return a string representing the time between WHEN and the time
 151    that this function is first run. */
 152
 153 static const char *
 154 idle_string (time_t when)
 155 {
 156   static time_t now = 0;
 157   static char buf[INT_STRLEN_BOUND (long int) + 2];
 158   time_t seconds_idle;
 159
 160   if (now == 0)
 161     time (&now);
 162
 163   seconds_idle = now - when;
 164   if (seconds_idle < 60)        /* One minute. */
 165     return "     ";
 166   if (seconds_idle < (24 * 60 * 60))    /* One day. */
 167     {
 168       int hours = seconds_idle / (60 * 60);
 169       int minutes = (seconds_idle % (60 * 60)) / 60;
 170       sprintf (buf, "%02d:%02d", hours, minutes);
 171     }
 172   else
 173     {
 174       unsigned long int days = seconds_idle / (24 * 60 * 60);
 175       sprintf (buf, "%lud", days);
 176     }
 177   return buf;
 178 }
 179
 180 /* Return a time string.  */
 181 static const char *
 182 time_string (const STRUCT_UTMP *utmp_ent)
 183 {
 184   static char buf[INT_STRLEN_BOUND (intmax_t) + sizeof "-%m-%d %H:%M"];
 185
 186   /* Don't take the address of UT_TIME_MEMBER directly.
 187      Ulrich Drepper wrote:
 188      ``... GNU libc (and perhaps other libcs as well) have extended
 189      utmp file formats which do not use a simple time_t ut_time field.
 190      In glibc, ut_time is a macro which selects for backward compatibility
 191      the tv_sec member of a struct timeval value.''  */
 192   time_t t = UT_TIME_MEMBER (utmp_ent);
 193   struct tm *tmp = localtime (&t);
 194
 195   if (tmp)
 196     {
 197       strftime (buf, sizeof buf, time_format, tmp);
 198       return buf;
 199     }
 200   else
 201     return TYPE_SIGNED (time_t) ? imaxtostr (t, buf) : umaxtostr (t, buf);
 202 }
 203
 204 /* Display a line of information about UTMP_ENT. */
 205
 206 static void
 207 print_entry (const STRUCT_UTMP *utmp_ent)
 208 {
 209   struct stat stats;
 210   time_t last_change;
 211   char mesg;
 212
 213 #define DEV_DIR_WITH_TRAILING_SLASH "/dev/"
 214 #define DEV_DIR_LEN (sizeof (DEV_DIR_WITH_TRAILING_SLASH) - 1)
 215
 216   char line[sizeof (utmp_ent->ut_line) + DEV_DIR_LEN + 1];
 217
 218   /* Copy ut_line into LINE, prepending `/dev/' if ut_line is not
 219      already an absolute file name.  Some system may put the full,
 220      absolute file name in ut_line.  */
 221   if (utmp_ent->ut_line[0] == '/')
 222     {
 223       strncpy (line, utmp_ent->ut_line, sizeof (utmp_ent->ut_line));
 224       line[sizeof (utmp_ent->ut_line)] = '\0';
 225     }
 226   else
 227     {
 228       strcpy (line, DEV_DIR_WITH_TRAILING_SLASH);
 229       strncpy (line + DEV_DIR_LEN, utmp_ent->ut_line, sizeof (utmp_ent->ut_line));
 230       line[DEV_DIR_LEN + sizeof (utmp_ent->ut_line)] = '\0';
 231     }
 232
 233   if (stat (line, &stats) == 0)
 234     {
 235       mesg = (stats.st_mode & S_IWGRP) ? ' ' : '*';
 236       last_change = stats.st_atime;
 237     }
 238   else
 239     {
 240       mesg = '?';
 241       last_change = 0;
 242     }
 243
 244   printf ("%-8.*s", UT_USER_SIZE, UT_USER (utmp_ent));
 245
 246   if (include_fullname)
 247     {
 248       struct passwd *pw;
 249       char name[UT_USER_SIZE + 1];
 250
 251       strncpy (name, UT_USER (utmp_ent), UT_USER_SIZE);
 252       name[UT_USER_SIZE] = '\0';
 253       pw = getpwnam (name);
 254       if (pw == NULL)
 255         printf (" %19s", "        ???");
 256       else
 257         {
 258           char *const comma = strchr (pw->pw_gecos, ',');
 259           char *result;
 260
 261           if (comma)
 262             *comma = '\0';
 263
 264           result = create_fullname (pw->pw_gecos, pw->pw_name);
 265           printf (" %-19.19s", result);
 266           free (result);
 267         }
 268     }
 269
 270   printf (" %c%-8.*s",
 271           mesg, (int) sizeof (utmp_ent->ut_line), utmp_ent->ut_line);
 272
 273   if (include_idle)
 274     {
 275       if (last_change)
 276         printf (" %-6s", idle_string (last_change));
 277       else
 278         printf (" %-6s", "???");
 279     }
 280
 281   printf (" %s", time_string (utmp_ent));
 282
 283 #ifdef HAVE_UT_HOST
 284   if (include_where && utmp_ent->ut_host[0])
 285     {
 286       char ut_host[sizeof (utmp_ent->ut_host) + 1];
 287       char *host = NULL;
 288       char *display = NULL;
 289
 290       /* Copy the host name into UT_HOST, and ensure it's nul terminated. */
 291       strncpy (ut_host, utmp_ent->ut_host, (int) sizeof (utmp_ent->ut_host));
 292       ut_host[sizeof (utmp_ent->ut_host)] = '\0';
 293
 294       /* Look for an X display.  */
 295       display = strchr (ut_host, ':');
 296       if (display)
 297         *display++ = '\0';
 298
 299       if (*ut_host)
 300         /* See if we can canonicalize it.  */
 301         host = canon_host (ut_host);
 302       if ( ! host)
 303         host = ut_host;
 304
 305       if (display)
 306         printf (" %s:%s", host, display);
 307       else
 308         printf (" %s", host);
 309
 310       if (host != ut_host)
 311         free (host);
 312     }
 313 #endif
 314
 315   putchar ('\n');
 316 }
 317
 318 /* Display a verbose line of information about UTMP_ENT. */
 319
 320 static void
 321 print_long_entry (const char name[])
 322 {
 323   struct passwd *pw;
 324
 325   pw = getpwnam (name);
 326
 327   printf (_("Login name: "));
 328   printf ("%-28s", name);
 329
 330   printf (_("In real life: "));
 331   if (pw == NULL)
 332     {
 333       printf (" %s", _("???\n"));
 334       return;
 335     }
 336   else
 337     {
 338       char *const comma = strchr (pw->pw_gecos, ',');
 339       char *result;
 340
 341       if (comma)
 342         *comma = '\0';
 343
 344       result = create_fullname (pw->pw_gecos, pw->pw_name);
 345       printf (" %s", result);
 346       free (result);
 347     }
 348
 349   putchar ('\n');
 350
 351   if (include_home_and_shell)
 352     {
 353       printf (_("Directory: "));
 354       printf ("%-29s", pw->pw_dir);
 355       printf (_("Shell: "));
 356       printf (" %s", pw->pw_shell);
 357       putchar ('\n');
 358     }
 359
 360   if (include_project)
 361     {
 362       FILE *stream;
 363       char buf[1024];
 364       const char *const baseproject = "/.project";
 365       char *const project =
 366       xmalloc (strlen (pw->pw_dir) + strlen (baseproject) + 1);
 367
 368       strcpy (project, pw->pw_dir);
 369       strcat (project, baseproject);
 370
 371       stream = fopen (project, "r");
 372       if (stream)
 373         {
 374           size_t bytes;
 375
 376           printf (_("Project: "));
 377
 378           while ((bytes = fread (buf, 1, sizeof (buf), stream)) > 0)
 379             fwrite (buf, 1, bytes, stdout);
 380           fclose (stream);
 381         }
 382
 383       free (project);
 384     }
 385
 386   if (include_plan)
 387     {
 388       FILE *stream;
 389       char buf[1024];
 390       const char *const baseplan = "/.plan";
 391       char *const plan =
 392       xmalloc (strlen (pw->pw_dir) + strlen (baseplan) + 1);
 393
 394       strcpy (plan, pw->pw_dir);
 395       strcat (plan, baseplan);
 396
 397       stream = fopen (plan, "r");
 398       if (stream)
 399         {
 400           size_t bytes;
 401
 402           printf (_("Plan:\n"));
 403
 404           while ((bytes = fread (buf, 1, sizeof (buf), stream)) > 0)
 405             fwrite (buf, 1, bytes, stdout);
 406           fclose (stream);
 407         }
 408
 409       free (plan);
 410     }
 411
 412   putchar ('\n');
 413 }
 414
 415 /* Print the username of each valid entry and the number of valid entries
 416    in UTMP_BUF, which should have N elements. */
 417
 418 static void
 419 print_heading (void)
 420 {
 421   printf ("%-8s", _("Login"));
 422   if (include_fullname)
 423     printf (" %-19s", _("Name"));
 424   printf (" %-9s", _(" TTY"));
 425   if (include_idle)
 426     printf (" %-6s", _("Idle"));
 427   printf (" %-*s", time_format_width, _("When"));
 428 #ifdef HAVE_UT_HOST
 429   if (include_where)
 430     printf (" %s", _("Where"));
 431 #endif
 432   putchar ('\n');
 433 }
 434
 435 /* Display UTMP_BUF, which should have N entries. */
 436
 437 static void
 438 scan_entries (size_t n, const STRUCT_UTMP *utmp_buf,
 439               const int argc_names, char *const argv_names[])
 440 {
 441   if (hard_locale (LC_TIME))
 442     {
 443       time_format = "%Y-%m-%d %H:%M";
 444       time_format_width = 4 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 2;
 445     }
 446   else
 447     {
 448       time_format = "%b %e %H:%M";
 449       time_format_width = 3 + 1 + 2 + 1 + 2 + 1 + 2;
 450     }
 451
 452   if (include_heading)
 453     print_heading ();
 454
 455   while (n--)
 456     {
 457       if (IS_USER_PROCESS (utmp_buf))
 458         {
 459           if (argc_names)
 460             {
 461               int i;
 462
 463               for (i = 0; i < argc_names; i++)
 464                 if (strncmp (UT_USER (utmp_buf), argv_names[i], UT_USER_SIZE)
 465                     == 0)
 466                   {
 467                     print_entry (utmp_buf);
 468                     break;
 469                   }
 470             }
 471           else
 472             print_entry (utmp_buf);
 473         }
 474       utmp_buf++;
 475     }
 476 }
 477
 478 /* Display a list of who is on the system, according to utmp file FILENAME. */
 479
 480 static void
 481 short_pinky (const char *filename,
 482              const int argc_names, char *const argv_names[])
 483 {
 484   size_t n_users;
 485   STRUCT_UTMP *utmp_buf;
 486
 487   if (read_utmp (filename, &n_users, &utmp_buf, 0) != 0)
 488     error (EXIT_FAILURE, errno, "%s", filename);
 489
 490   scan_entries (n_users, utmp_buf, argc_names, argv_names);
 491 }
 492
 493 static void
 494 long_pinky (const int argc_names, char *const argv_names[])
 495 {
 496   int i;
 497
 498   for (i = 0; i < argc_names; i++)
 499     print_long_entry (argv_names[i]);
 500 }
 501
 502 void
 503 usage (int status)
 504 {
 505   if (status != EXIT_SUCCESS)
 506     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 507              program_name);
 508   else
 509     {
 510       printf (_("Usage: %s [OPTION]... [USER]...\n"), program_name);
 511       fputs (_("\
 512 \n\
 513   -l              produce long format output for the specified USERs\n\
 514   -b              omit the user's home directory and shell in long format\n\
 515   -h              omit the user's project file in long format\n\
 516   -p              omit the user's plan file in long format\n\
 517   -s              do short format output, this is the default\n\
 518 "), stdout);
 519       fputs (_("\
 520   -f              omit the line of column headings in short format\n\
 521   -w              omit the user's full name in short format\n\
 522   -i              omit the user's full name and remote host in short format\n\
 523   -q              omit the user's full name, remote host and idle time\n\
 524                   in short format\n\
 525 "), stdout);
 526       fputs (HELP_OPTION_DESCRIPTION, stdout);
 527       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 528       printf (_("\
 529 \n\
 530 A lightweight `finger' program;  print user information.\n\
 531 The utmp file will be %s.\n\
 532 "), UTMP_FILE);
 533       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
 534     }
 535   exit (status);
 536 }
 537
 538 int
 539 main (int argc, char **argv)
 540 {
 541   int optc;
 542   int n_users;
 543
 544   initialize_main (&argc, &argv);
 545   program_name = argv[0];
 546   setlocale (LC_ALL, "");
 547   bindtextdomain (PACKAGE, LOCALEDIR);
 548   textdomain (PACKAGE);
 549
 550   atexit (close_stdout);
 551
 552   while ((optc = getopt_long (argc, argv, "sfwiqbhlp", longopts, NULL)) != -1)
 553     {
 554       switch (optc)
 555         {
 556         case 's':
 557           do_short_format = true;
 558           break;
 559
 560         case 'l':
 561           do_short_format = false;
 562           break;
 563
 564         case 'f':
 565           include_heading = false;
 566           break;
 567
 568         case 'w':
 569           include_fullname = false;
 570           break;
 571
 572         case 'i':
 573           include_fullname = false;
 574 #ifdef HAVE_UT_HOST
 575           include_where = false;
 576 #endif
 577           break;
 578
 579         case 'q':
 580           include_fullname = false;
 581 #ifdef HAVE_UT_HOST
 582           include_where = false;
 583 #endif
 584           include_idle = false;
 585           break;
 586
 587         case 'h':
 588           include_project = false;
 589           break;
 590
 591         case 'p':
 592           include_plan = false;
 593           break;
 594
 595         case 'b':
 596           include_home_and_shell = false;
 597           break;
 598
 599         case_GETOPT_HELP_CHAR;
 600
 601         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 602
 603         default:
 604           usage (EXIT_FAILURE);
 605         }
 606     }
 607
 608   n_users = argc - optind;
 609
 610   if (!do_short_format && n_users == 0)
 611     {
 612       error (0, 0, _("no username specified; at least one must be\
 613  specified when using -l"));
 614       usage (EXIT_FAILURE);
 615     }
 616
 617   if (do_short_format)
 618     short_pinky (UTMP_FILE, n_users, argv + optind);
 619   else
 620     long_pinky (n_users, argv + optind);
 621
 622   exit (EXIT_SUCCESS);
 623 }