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 #ifndef S_IWGRP
  44 # define S_IWGRP 020
  45 #endif
  46
  47 char *ttyname ();
  48
  49 /* The name this program was run with. */
  50 const char *program_name;
  51
  52 /* If true, display the hours:minutes since each user has touched
  53    the keyboard, or blank if within the last minute, or days followed
  54    by a 'd' if not within the last day. */
  55 static bool include_idle = true;
  56
  57 /* If true, display a line at the top describing each field. */
  58 static bool include_heading = true;
  59
  60 /* if true, display the user's full name from pw_gecos. */
  61 static bool include_fullname = true;
  62
  63 /* if true, display the user's ~/.project file when doing long format. */
  64 static bool include_project = true;
  65
  66 /* if true, display the user's ~/.plan file when doing long format. */
  67 static bool include_plan = true;
  68
  69 /* if true, display the user's home directory and shell
  70    when doing long format. */
  71 static bool include_home_and_shell = true;
  72
  73 /* if true, use the "short" output format. */
  74 static bool do_short_format = true;
  75
  76 /* if true, display the ut_host field. */
  77 #ifdef HAVE_UT_HOST
  78 static bool include_where = true;
  79 #endif
  80
  81 /* The strftime format to use for login times, and its expected
  82    output width.  */
  83 static char const *time_format;
  84 static int time_format_width;
  85
  86 static struct option const longopts[] =
  87 {
  88   {GETOPT_HELP_OPTION_DECL},
  89   {GETOPT_VERSION_OPTION_DECL},
  90   {NULL, 0, NULL, 0}
  91 };
  92
  93 /* Count and return the number of ampersands in STR.  */
  94
  95 static size_t
  96 count_ampersands (const char *str)
  97 {
  98   size_t count = 0;
  99   do
 100     {
 101       if (*str == '&')
 102         count++;
 103     } while (*str++);
 104   return count;
 105 }
 106
 107 /* Create a string (via xmalloc) which contains a full name by substituting
 108    for each ampersand in GECOS_NAME the USER_NAME string with its first
 109    character capitalized.  The caller must ensure that GECOS_NAME contains
 110    no `,'s.  The caller also is responsible for free'ing the return value of
 111    this function.  */
 112
 113 static char *
 114 create_fullname (const char *gecos_name, const char *user_name)
 115 {
 116   size_t rsize = strlen (gecos_name) + 1;
 117   char *result;
 118   char *r;
 119   size_t ampersands = count_ampersands (gecos_name);
 120
 121   if (ampersands != 0)
 122     {
 123       size_t ulen = strlen (user_name);
 124       size_t product = ampersands * ulen;
 125       rsize += product - ampersands;
 126       if (xalloc_oversized (ulen, ampersands) || rsize < product)
 127         xalloc_die ();
 128     }
 129
 130   r = result = xmalloc (rsize);
 131
 132   while (*gecos_name)
 133     {
 134       if (*gecos_name == '&')
 135         {
 136           const char *uname = user_name;
 137           if (islower (to_uchar (*uname)))
 138             *r++ = toupper (to_uchar (*uname++));
 139           while (*uname)
 140             *r++ = *uname++;
 141         }
 142       else
 143         {
 144           *r++ = *gecos_name;
 145         }
 146
 147       gecos_name++;
 148     }
 149   *r = 0;
 150
 151   return result;
 152 }
 153
 154 /* Return a string representing the time between WHEN and the time
 155    that this function is first run. */
 156
 157 static const char *
 158 idle_string (time_t when)
 159 {
 160   static time_t now = 0;
 161   static char buf[INT_STRLEN_BOUND (long int) + 2];
 162   time_t seconds_idle;
 163
 164   if (now == 0)
 165     time (&now);
 166
 167   seconds_idle = now - when;
 168   if (seconds_idle < 60)        /* One minute. */
 169     return "     ";
 170   if (seconds_idle < (24 * 60 * 60))    /* One day. */
 171     {
 172       int hours = seconds_idle / (60 * 60);
 173       int minutes = (seconds_idle % (60 * 60)) / 60;
 174       sprintf (buf, "%02d:%02d", hours, minutes);
 175     }
 176   else
 177     {
 178       unsigned long int days = seconds_idle / (24 * 60 * 60);
 179       sprintf (buf, "%lud", days);
 180     }
 181   return buf;
 182 }
 183
 184 /* Return a time string.  */
 185 static const char *
 186 time_string (const STRUCT_UTMP *utmp_ent)
 187 {
 188   static char buf[INT_STRLEN_BOUND (intmax_t) + sizeof "-%m-%d %H:%M"];
 189
 190   /* Don't take the address of UT_TIME_MEMBER directly.
 191      Ulrich Drepper wrote:
 192      ``... GNU libc (and perhaps other libcs as well) have extended
 193      utmp file formats which do not use a simple time_t ut_time field.
 194      In glibc, ut_time is a macro which selects for backward compatibility
 195      the tv_sec member of a struct timeval value.''  */
 196   time_t t = UT_TIME_MEMBER (utmp_ent);
 197   struct tm *tmp = localtime (&t);
 198
 199   if (tmp)
 200     {
 201       strftime (buf, sizeof buf, time_format, tmp);
 202       return buf;
 203     }
 204   else
 205     return TYPE_SIGNED (time_t) ? imaxtostr (t, buf) : umaxtostr (t, buf);
 206 }
 207
 208 /* Display a line of information about UTMP_ENT. */
 209
 210 static void
 211 print_entry (const STRUCT_UTMP *utmp_ent)
 212 {
 213   struct stat stats;
 214   time_t last_change;
 215   char mesg;
 216
 217 #define DEV_DIR_WITH_TRAILING_SLASH "/dev/"
 218 #define DEV_DIR_LEN (sizeof (DEV_DIR_WITH_TRAILING_SLASH) - 1)
 219
 220   char line[sizeof (utmp_ent->ut_line) + DEV_DIR_LEN + 1];
 221
 222   /* Copy ut_line into LINE, prepending `/dev/' if ut_line is not
 223      already an absolute file name.  Some system may put the full,
 224      absolute file name in ut_line.  */
 225   if (utmp_ent->ut_line[0] == '/')
 226     {
 227       strncpy (line, utmp_ent->ut_line, sizeof (utmp_ent->ut_line));
 228       line[sizeof (utmp_ent->ut_line)] = '\0';
 229     }
 230   else
 231     {
 232       strcpy (line, DEV_DIR_WITH_TRAILING_SLASH);
 233       strncpy (line + DEV_DIR_LEN, utmp_ent->ut_line, sizeof (utmp_ent->ut_line));
 234       line[DEV_DIR_LEN + sizeof (utmp_ent->ut_line)] = '\0';
 235     }
 236
 237   if (stat (line, &stats) == 0)
 238     {
 239       mesg = (stats.st_mode & S_IWGRP) ? ' ' : '*';
 240       last_change = stats.st_atime;
 241     }
 242   else
 243     {
 244       mesg = '?';
 245       last_change = 0;
 246     }
 247
 248   printf ("%-8.*s", UT_USER_SIZE, UT_USER (utmp_ent));
 249
 250   if (include_fullname)
 251     {
 252       struct passwd *pw;
 253       char name[UT_USER_SIZE + 1];
 254
 255       strncpy (name, UT_USER (utmp_ent), UT_USER_SIZE);
 256       name[UT_USER_SIZE] = '\0';
 257       pw = getpwnam (name);
 258       if (pw == NULL)
 259         printf (" %19s", "        ???");
 260       else
 261         {
 262           char *const comma = strchr (pw->pw_gecos, ',');
 263           char *result;
 264
 265           if (comma)
 266             *comma = '\0';
 267
 268           result = create_fullname (pw->pw_gecos, pw->pw_name);
 269           printf (" %-19.19s", result);
 270           free (result);
 271         }
 272     }
 273
 274   printf (" %c%-8.*s",
 275           mesg, (int) sizeof (utmp_ent->ut_line), utmp_ent->ut_line);
 276
 277   if (include_idle)
 278     {
 279       if (last_change)
 280         printf (" %-6s", idle_string (last_change));
 281       else
 282         printf (" %-6s", "???");
 283     }
 284
 285   printf (" %s", time_string (utmp_ent));
 286
 287 #ifdef HAVE_UT_HOST
 288   if (include_where && utmp_ent->ut_host[0])
 289     {
 290       char ut_host[sizeof (utmp_ent->ut_host) + 1];
 291       char *host = NULL;
 292       char *display = NULL;
 293
 294       /* Copy the host name into UT_HOST, and ensure it's nul terminated. */
 295       strncpy (ut_host, utmp_ent->ut_host, (int) sizeof (utmp_ent->ut_host));
 296       ut_host[sizeof (utmp_ent->ut_host)] = '\0';
 297
 298       /* Look for an X display.  */
 299       display = strchr (ut_host, ':');
 300       if (display)
 301         *display++ = '\0';
 302
 303       if (*ut_host)
 304         /* See if we can canonicalize it.  */
 305         host = canon_host (ut_host);
 306       if ( ! host)
 307         host = ut_host;
 308
 309       if (display)
 310         printf (" %s:%s", host, display);
 311       else
 312         printf (" %s", host);
 313
 314       if (host != ut_host)
 315         free (host);
 316     }
 317 #endif
 318
 319   putchar ('\n');
 320 }
 321
 322 /* Display a verbose line of information about UTMP_ENT. */
 323
 324 static void
 325 print_long_entry (const char name[])
 326 {
 327   struct passwd *pw;
 328
 329   pw = getpwnam (name);
 330
 331   printf (_("Login name: "));
 332   printf ("%-28s", name);
 333
 334   printf (_("In real life: "));
 335   if (pw == NULL)
 336     {
 337       printf (" %s", _("???\n"));
 338       return;
 339     }
 340   else
 341     {
 342       char *const comma = strchr (pw->pw_gecos, ',');
 343       char *result;
 344
 345       if (comma)
 346         *comma = '\0';
 347
 348       result = create_fullname (pw->pw_gecos, pw->pw_name);
 349       printf (" %s", result);
 350       free (result);
 351     }
 352
 353   putchar ('\n');
 354
 355   if (include_home_and_shell)
 356     {
 357       printf (_("Directory: "));
 358       printf ("%-29s", pw->pw_dir);
 359       printf (_("Shell: "));
 360       printf (" %s", pw->pw_shell);
 361       putchar ('\n');
 362     }
 363
 364   if (include_project)
 365     {
 366       FILE *stream;
 367       char buf[1024];
 368       const char *const baseproject = "/.project";
 369       char *const project =
 370       xmalloc (strlen (pw->pw_dir) + strlen (baseproject) + 1);
 371
 372       strcpy (project, pw->pw_dir);
 373       strcat (project, baseproject);
 374
 375       stream = fopen (project, "r");
 376       if (stream)
 377         {
 378           size_t bytes;
 379
 380           printf (_("Project: "));
 381
 382           while ((bytes = fread (buf, 1, sizeof (buf), stream)) > 0)
 383             fwrite (buf, 1, bytes, stdout);
 384           fclose (stream);
 385         }
 386
 387       free (project);
 388     }
 389
 390   if (include_plan)
 391     {
 392       FILE *stream;
 393       char buf[1024];
 394       const char *const baseplan = "/.plan";
 395       char *const plan =
 396       xmalloc (strlen (pw->pw_dir) + strlen (baseplan) + 1);
 397
 398       strcpy (plan, pw->pw_dir);
 399       strcat (plan, baseplan);
 400
 401       stream = fopen (plan, "r");
 402       if (stream)
 403         {
 404           size_t bytes;
 405
 406           printf (_("Plan:\n"));
 407
 408           while ((bytes = fread (buf, 1, sizeof (buf), stream)) > 0)
 409             fwrite (buf, 1, bytes, stdout);
 410           fclose (stream);
 411         }
 412
 413       free (plan);
 414     }
 415
 416   putchar ('\n');
 417 }
 418
 419 /* Print the username of each valid entry and the number of valid entries
 420    in UTMP_BUF, which should have N elements. */
 421
 422 static void
 423 print_heading (void)
 424 {
 425   printf ("%-8s", _("Login"));
 426   if (include_fullname)
 427     printf (" %-19s", _("Name"));
 428   printf (" %-9s", _(" TTY"));
 429   if (include_idle)
 430     printf (" %-6s", _("Idle"));
 431   printf (" %-*s", time_format_width, _("When"));
 432 #ifdef HAVE_UT_HOST
 433   if (include_where)
 434     printf (" %s", _("Where"));
 435 #endif
 436   putchar ('\n');
 437 }
 438
 439 /* Display UTMP_BUF, which should have N entries. */
 440
 441 static void
 442 scan_entries (size_t n, const STRUCT_UTMP *utmp_buf,
 443               const int argc_names, char *const argv_names[])
 444 {
 445   if (hard_locale (LC_TIME))
 446     {
 447       time_format = "%Y-%m-%d %H:%M";
 448       time_format_width = 4 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 2;
 449     }
 450   else
 451     {
 452       time_format = "%b %e %H:%M";
 453       time_format_width = 3 + 1 + 2 + 1 + 2 + 1 + 2;
 454     }
 455
 456   if (include_heading)
 457     print_heading ();
 458
 459   while (n--)
 460     {
 461       if (IS_USER_PROCESS (utmp_buf))
 462         {
 463           if (argc_names)
 464             {
 465               int i;
 466
 467               for (i = 0; i < argc_names; i++)
 468                 if (strncmp (UT_USER (utmp_buf), argv_names[i], UT_USER_SIZE)
 469                     == 0)
 470                   {
 471                     print_entry (utmp_buf);
 472                     break;
 473                   }
 474             }
 475           else
 476             print_entry (utmp_buf);
 477         }
 478       utmp_buf++;
 479     }
 480 }
 481
 482 /* Display a list of who is on the system, according to utmp file FILENAME. */
 483
 484 static void
 485 short_pinky (const char *filename,
 486              const int argc_names, char *const argv_names[])
 487 {
 488   size_t n_users;
 489   STRUCT_UTMP *utmp_buf;
 490
 491   if (read_utmp (filename, &n_users, &utmp_buf, 0) != 0)
 492     error (EXIT_FAILURE, errno, "%s", filename);
 493
 494   scan_entries (n_users, utmp_buf, argc_names, argv_names);
 495 }
 496
 497 static void
 498 long_pinky (const int argc_names, char *const argv_names[])
 499 {
 500   int i;
 501
 502   for (i = 0; i < argc_names; i++)
 503     print_long_entry (argv_names[i]);
 504 }
 505
 506 void
 507 usage (int status)
 508 {
 509   if (status != EXIT_SUCCESS)
 510     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 511              program_name);
 512   else
 513     {
 514       printf (_("Usage: %s [OPTION]... [USER]...\n"), program_name);
 515       fputs (_("\
 516 \n\
 517   -l              produce long format output for the specified USERs\n\
 518   -b              omit the user's home directory and shell in long format\n\
 519   -h              omit the user's project file in long format\n\
 520   -p              omit the user's plan file in long format\n\
 521   -s              do short format output, this is the default\n\
 522 "), stdout);
 523       fputs (_("\
 524   -f              omit the line of column headings in short format\n\
 525   -w              omit the user's full name in short format\n\
 526   -i              omit the user's full name and remote host in short format\n\
 527   -q              omit the user's full name, remote host and idle time\n\
 528                   in short format\n\
 529 "), stdout);
 530       fputs (HELP_OPTION_DESCRIPTION, stdout);
 531       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 532       printf (_("\
 533 \n\
 534 A lightweight `finger' program;  print user information.\n\
 535 The utmp file will be %s.\n\
 536 "), UTMP_FILE);
 537       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
 538     }
 539   exit (status);
 540 }
 541
 542 int
 543 main (int argc, char **argv)
 544 {
 545   int optc;
 546   int n_users;
 547
 548   initialize_main (&argc, &argv);
 549   program_name = argv[0];
 550   setlocale (LC_ALL, "");
 551   bindtextdomain (PACKAGE, LOCALEDIR);
 552   textdomain (PACKAGE);
 553
 554   atexit (close_stdout);
 555
 556   while ((optc = getopt_long (argc, argv, "sfwiqbhlp", longopts, NULL)) != -1)
 557     {
 558       switch (optc)
 559         {
 560         case 's':
 561           do_short_format = true;
 562           break;
 563
 564         case 'l':
 565           do_short_format = false;
 566           break;
 567
 568         case 'f':
 569           include_heading = false;
 570           break;
 571
 572         case 'w':
 573           include_fullname = false;
 574           break;
 575
 576         case 'i':
 577           include_fullname = false;
 578 #ifdef HAVE_UT_HOST
 579           include_where = false;
 580 #endif
 581           break;
 582
 583         case 'q':
 584           include_fullname = false;
 585 #ifdef HAVE_UT_HOST
 586           include_where = false;
 587 #endif
 588           include_idle = false;
 589           break;
 590
 591         case 'h':
 592           include_project = false;
 593           break;
 594
 595         case 'p':
 596           include_plan = false;
 597           break;
 598
 599         case 'b':
 600           include_home_and_shell = false;
 601           break;
 602
 603         case_GETOPT_HELP_CHAR;
 604
 605         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 606
 607         default:
 608           usage (EXIT_FAILURE);
 609         }
 610     }
 611
 612   n_users = argc - optind;
 613
 614   if (!do_short_format && n_users == 0)
 615     {
 616       error (0, 0, _("no username specified; at least one must be\
 617  specified when using -l"));
 618       usage (EXIT_FAILURE);
 619     }
 620
 621   if (do_short_format)
 622     short_pinky (UTMP_FILE, n_users, argv + optind);
 623   else
 624     long_pinky (n_users, argv + optind);
 625
 626   exit (EXIT_SUCCESS);
 627 }