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Diffstat (limited to 'src/pinky.c')
| -rw-r--r-- | src/pinky.c | 602 |
1 files changed, 602 insertions, 0 deletions
diff --git a/src/pinky.c b/src/pinky.c new file mode 100644 index 0000000..88862c2 --- /dev/null +++ b/src/pinky.c @@ -0,0 +1,602 @@ +/* GNU's pinky. + Copyright (C) 1992-2022 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */ + +/* 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 <sys/types.h> +#include "system.h" + +#include "canon-host.h" +#include "die.h" +#include "error.h" +#include "hard-locale.h" +#include "readutmp.h" + +/* The official name of this program (e.g., no 'g' prefix). */ +#define PROGRAM_NAME "pinky" + +#define AUTHORS \ + proper_name ("Joseph Arceneaux"), \ + proper_name ("David MacKenzie"), \ + proper_name ("Kaveh Ghazi") + +/* If true, 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 bool include_idle = true; + +/* If true, display a line at the top describing each field. */ +static bool include_heading = true; + +/* if true, display the user's full name from pw_gecos. */ +static bool include_fullname = true; + +/* if true, display the user's ~/.project file when doing long format. */ +static bool include_project = true; + +/* if true, display the user's ~/.plan file when doing long format. */ +static bool include_plan = true; + +/* if true, display the user's home directory and shell + when doing long format. */ +static bool include_home_and_shell = true; + +/* if true, use the "short" output format. */ +static bool do_short_format = true; + +/* if true, display the ut_host field. */ +#ifdef HAVE_UT_HOST +static bool include_where = true; +#endif + +/* The strftime format to use for login times, and its expected + output width. */ +static char const *time_format; +static int time_format_width; + +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. */ + +ATTRIBUTE_PURE +static size_t +count_ampersands (char const *str) +{ + size_t 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 (char const *gecos_name, char const *user_name) +{ + size_t rsize = strlen (gecos_name) + 1; + char *result; + char *r; + size_t ampersands = count_ampersands (gecos_name); + + if (ampersands != 0) + { + size_t ulen = strlen (user_name); + size_t product; + if (INT_MULTIPLY_WRAPV (ulen, ampersands - 1, &product) + || INT_ADD_WRAPV (rsize, product, &rsize)) + xalloc_die (); + } + + r = result = xmalloc (rsize); + + while (*gecos_name) + { + if (*gecos_name == '&') + { + char const *uname = user_name; + if (islower (to_uchar (*uname))) + *r++ = toupper (to_uchar (*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 char const * +idle_string (time_t when) +{ + static time_t now = 0; + static char buf[INT_STRLEN_BOUND (long int) + 2]; + 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. */ + { + int hours = seconds_idle / (60 * 60); + int minutes = (seconds_idle % (60 * 60)) / 60; + sprintf (buf, "%02d:%02d", hours, minutes); + } + else + { + unsigned long int days = seconds_idle / (24 * 60 * 60); + sprintf (buf, "%lud", days); + } + return buf; +} + +/* Return a time string. */ +static char const * +time_string (const STRUCT_UTMP *utmp_ent) +{ + static char buf[INT_STRLEN_BOUND (intmax_t) + sizeof "-%m-%d %H:%M"]; + + /* 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." */ + time_t t = UT_TIME_MEMBER (utmp_ent); + struct tm *tmp = localtime (&t); + + if (tmp) + { + strftime (buf, sizeof buf, time_format, tmp); + return buf; + } + else + return timetostr (t, buf); +} + +/* 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]; + char *p = line; + + /* Copy ut_line into LINE, prepending '/dev/' if ut_line is not + already an absolute file name. Some system may put the full, + absolute file name in ut_line. */ + if ( ! IS_ABSOLUTE_FILE_NAME (utmp_ent->ut_line)) + p = stpcpy (p, DEV_DIR_WITH_TRAILING_SLASH); + stzncpy (p, utmp_ent->ut_line, sizeof (utmp_ent->ut_line)); + + if (stat (line, &stats) == 0) + { + mesg = (stats.st_mode & S_IWGRP) ? ' ' : '*'; + last_change = stats.st_atime; + } + else + { + mesg = '?'; + last_change = 0; + } + + printf ("%-8.*s", UT_USER_SIZE, UT_USER (utmp_ent)); + + if (include_fullname) + { + struct passwd *pw; + char name[UT_USER_SIZE + 1]; + + stzncpy (name, UT_USER (utmp_ent), UT_USER_SIZE); + pw = getpwnam (name); + if (pw == NULL) + /* TRANSLATORS: Real name is unknown; at most 19 characters. */ + 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 + /* TRANSLATORS: Idle time is unknown; at most 5 characters. */ + printf (" %-6s", _("?????")); + } + + printf (" %s", time_string (utmp_ent)); + +#ifdef HAVE_UT_HOST + if (include_where && utmp_ent->ut_host[0]) + { + char ut_host[sizeof (utmp_ent->ut_host) + 1]; + char *host = NULL; + char *display = NULL; + + /* Copy the host name into UT_HOST, and ensure it's nul terminated. */ + stzncpy (ut_host, utmp_ent->ut_host, sizeof (utmp_ent->ut_host)); + + /* Look for an X display. */ + display = strchr (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); + + if (host != ut_host) + free (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) + { + /* TRANSLATORS: Real name is unknown; no hard limit. */ + 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]; + char const *const baseproject = "/.project"; + char *const project = + xmalloc (strlen (pw->pw_dir) + strlen (baseproject) + 1); + stpcpy (stpcpy (project, pw->pw_dir), baseproject); + + stream = fopen (project, "r"); + if (stream) + { + size_t 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]; + char const *const baseplan = "/.plan"; + char *const plan = + xmalloc (strlen (pw->pw_dir) + strlen (baseplan) + 1); + stpcpy (stpcpy (plan, pw->pw_dir), baseplan); + + stream = fopen (plan, "r"); + if (stream) + { + size_t 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 (" %-*s", time_format_width, _("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 (size_t n, const STRUCT_UTMP *utmp_buf, + const int argc_names, char *const argv_names[]) +{ + if (hard_locale (LC_TIME)) + { + time_format = "%Y-%m-%d %H:%M"; + time_format_width = 4 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 2; + } + else + { + time_format = "%b %e %H:%M"; + time_format_width = 3 + 1 + 2 + 1 + 2 + 1 + 2; + } + + if (include_heading) + print_heading (); + + while (n--) + { + if (IS_USER_PROCESS (utmp_buf)) + { + if (argc_names) + { + for (int i = 0; i < argc_names; i++) + if (STREQ_LEN (UT_USER (utmp_buf), argv_names[i], UT_USER_SIZE)) + { + 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 (char const *filename, + const int argc_names, char *const argv_names[]) +{ + size_t n_users; + STRUCT_UTMP *utmp_buf = NULL; + + if (read_utmp (filename, &n_users, &utmp_buf, 0) != 0) + die (EXIT_FAILURE, errno, "%s", quotef (filename)); + + scan_entries (n_users, utmp_buf, argc_names, argv_names); + exit (EXIT_SUCCESS); +} + +static void +long_pinky (const int argc_names, char *const argv_names[]) +{ + for (int i = 0; i < argc_names; i++) + print_long_entry (argv_names[i]); +} + +void +usage (int status) +{ + if (status != EXIT_SUCCESS) + emit_try_help (); + else + { + printf (_("Usage: %s [OPTION]... [USER]...\n"), program_name); + fputs (_("\ +\n\ + -l produce long format output for the specified USERs\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\ +"), stdout); + fputs (_("\ + -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\ +"), stdout); + fputs (HELP_OPTION_DESCRIPTION, stdout); + fputs (VERSION_OPTION_DESCRIPTION, stdout); + printf (_("\ +\n\ +A lightweight 'finger' program; print user information.\n\ +The utmp file will be %s.\n\ +"), UTMP_FILE); + emit_ancillary_info (PROGRAM_NAME); + } + exit (status); +} + +int +main (int argc, char **argv) +{ + int optc; + int n_users; + + initialize_main (&argc, &argv); + set_program_name (argv[0]); + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + atexit (close_stdout); + + while ((optc = getopt_long (argc, argv, "sfwiqbhlp", longopts, NULL)) != -1) + { + switch (optc) + { + case 's': + do_short_format = true; + break; + + case 'l': + do_short_format = false; + break; + + case 'f': + include_heading = false; + break; + + case 'w': + include_fullname = false; + break; + + case 'i': + include_fullname = false; +#ifdef HAVE_UT_HOST + include_where = false; +#endif + break; + + case 'q': + include_fullname = false; +#ifdef HAVE_UT_HOST + include_where = false; +#endif + include_idle = false; + break; + + case 'h': + include_project = false; + break; + + case 'p': + include_plan = false; + break; + + case 'b': + include_home_and_shell = false; + break; + + case_GETOPT_HELP_CHAR; + + case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS); + + default: + usage (EXIT_FAILURE); + } + } + + n_users = argc - optind; + + if (!do_short_format && n_users == 0) + { + error (0, 0, _("no username specified; at least one must be\ + specified when using -l")); + usage (EXIT_FAILURE); + } + + if (do_short_format) + short_pinky (UTMP_FILE, n_users, argv + optind); + else + long_pinky (n_users, argv + optind); + + return EXIT_SUCCESS; +} |