I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
237 lines
6 KiB
C
237 lines
6 KiB
C
/*
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* Copyright (c) 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* id.c
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* Return user identity.
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*/
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <grp.h>
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#include <locale.h>
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#include <pwd.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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const char* name_of_group_by_gid(gid_t gid)
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{
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errno = 0;
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struct group* grp = getgrgid(gid);
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if ( !grp && errno == 0 )
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errx(1, "gid %" PRIuGID " has no group entry", gid);
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if ( !grp )
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err(1, "gid %" PRIuGID "", gid);
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return grp->gr_name;
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}
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static void compact_arguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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{
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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}
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static void help(FILE* fp, const char* argv0)
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{
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fprintf(fp, "Usage: %s [OPTION]... [USERNAME]\n", argv0);
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fprintf(fp, "Print user and group information for the specified USERNAME,\n");
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fprintf(fp, "or (when USERNAME omitted) for the current user.\n");
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fprintf(fp, "\n");
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fprintf(fp, " -g, --group print only the effective group ID\n");
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fprintf(fp, " -G, --groups print all group IDs\n");
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fprintf(fp, " -n, --name print a name instead of a number, for -ugG\n");
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fprintf(fp, " -r, --real print the real ID instead of the effective ID, with -ugG\n");
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fprintf(fp, " -u, --user print only the effective user ID\n");
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fprintf(fp, " --help display this help and exit\n");
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fprintf(fp, " --version output version information and exit\n");
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}
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static void version(FILE* fp, const char* argv0)
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{
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fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
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}
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int main(int argc, char* argv[])
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{
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setlocale(LC_ALL, "");
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bool groups_only = false;
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bool group_only = false;
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bool user_only = false;
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bool names = false;
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bool real = false;
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const char* argv0 = argv[0];
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' || !arg[1] )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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case 'G': groups_only = true; break;
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case 'g': group_only = true; break;
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case 'n': names = true; break;
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case 'r': real = true; break;
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case 'u': user_only = true; break;
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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help(stderr, argv0);
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exit(1);
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}
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}
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else if ( !strcmp(arg, "--group") )
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group_only = true;
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else if ( !strcmp(arg, "--groups") )
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groups_only = true;
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else if ( !strcmp(arg, "--name") )
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names = true;
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else if ( !strcmp(arg, "--real") )
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real = true;
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else if ( !strcmp(arg, "--user") )
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user_only = true;
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else if ( !strcmp(arg, "--help") )
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help(stdout, argv0), exit(0);
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else if ( !strcmp(arg, "--version") )
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version(stdout, argv0), exit(0);
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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help(stderr, argv0);
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exit(1);
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}
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}
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compact_arguments(&argc, &argv);
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if ( 1 < groups_only + group_only + user_only )
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errx(1, "options -Ggu are mutually exclusive");
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(void) real; // Sortix only has real user ids.
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struct passwd* pwd;
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if ( 2 < argc )
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errx(1, "extra operand '%s'", argv[2]);
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else if ( argc == 2 )
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{
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errno = 0;
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pwd = getpwnam(argv[1]);
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if ( !pwd && errno == 0 )
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errx(1, "%s: no such user", argv[1]);
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if ( !pwd )
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err(1, "%s", argv[1]);
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}
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else
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{
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errno = 0;
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pwd = getpwuid(getuid());
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if ( !pwd && errno == 0 )
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errx(1, "current user has no user entry");
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if ( !pwd )
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err(1, "current user");
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}
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if ( groups_only )
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{
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// TODO: Sortix doesn't have getgroups at the moment.
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if ( names )
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printf("%s", name_of_group_by_gid(pwd->pw_gid));
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else
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printf("%" __PRIuGID, pwd->pw_gid);
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setgrent();
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struct group* grp;
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while ( (errno = 0, grp = getgrent()) )
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{
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if ( grp->gr_gid == pwd->pw_gid )
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continue;
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bool member = false;
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for ( size_t i = 0; !member && grp->gr_mem[i]; i++ )
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member = !strcmp(pwd->pw_name, grp->gr_mem[i]);
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if ( !member )
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continue;
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if ( names )
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printf(" %s", grp->gr_name);
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else
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printf(" %" __PRIuGID "", grp->gr_gid);
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}
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if ( errno != 0 )
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err(1, "getgrent");
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endgrent();
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printf("\n");
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}
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else if ( group_only )
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{
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// If current user, should this display the getgid() group instead?
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if ( names )
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printf("%s\n", name_of_group_by_gid(pwd->pw_gid));
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else
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printf("%" __PRIuGID "\n", pwd->pw_gid);
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}
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else if ( user_only )
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{
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if ( names )
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printf("%s\n", pwd->pw_name);
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else
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printf("%" __PRIuUID "\n", pwd->pw_uid);
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}
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else
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{
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if ( names || real )
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errx(1, "cannot print only names or real IDs in default format");
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name_of_group_by_gid(pwd->pw_gid); // Early error.
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printf("uid=%" PRIuUID "(%s) ", pwd->pw_uid, pwd->pw_name);
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printf("gid=%" PRIiGID "(%s) ", pwd->pw_gid, name_of_group_by_gid(pwd->pw_gid));
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printf("groups=");
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const char* prefix = "";
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setgrent();
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struct group* grp;
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while ( (errno = 0, grp = getgrent()) )
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{
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bool member = false;
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for ( size_t i = 0; !member && grp->gr_mem[i]; i++ )
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member = !strcmp(pwd->pw_name, grp->gr_mem[i]);
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if ( !member )
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continue;
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printf("%s%" __PRIuGID "(%s)", prefix, grp->gr_gid, grp->gr_name);
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prefix = ",";
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}
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if ( errno != 0 )
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err(1, "getgrent");
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endgrent();
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printf("\n");
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}
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if ( ferror(stdout) || fflush(stdout) == EOF )
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return 1;
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return 0;
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}
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