source: branches/2.2.2/mindi-busybox/coreutils/id.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 2.7 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini id implementation for busybox
4 *
5 * Copyright (C) 2000 by Randolph Chung <tausq@debian.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10/* BB_AUDIT SUSv3 _NOT_ compliant -- option -G is not currently supported. */
11/* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever length and to
12 * be more similar to GNU id.
13 */
14
15#include "busybox.h"
16#include "pwd_.h"
17#include <stdio.h>
18#include <unistd.h>
19#include <sys/types.h>
20
21#ifdef CONFIG_SELINUX
22#include <selinux/selinux.h>          /* for is_selinux_enabled() */
23#endif
24
25#define PRINT_REAL        1
26#define NAME_NOT_NUMBER   2
27#define JUST_USER         4
28#define JUST_GROUP        8
29
30static short printf_full(unsigned int id, const char *arg, const char prefix)
31{
32    const char *fmt = "%cid=%u";
33    short status=EXIT_FAILURE;
34
35    if(arg) {
36        fmt = "%cid=%u(%s)";
37        status=EXIT_SUCCESS;
38    }
39    bb_printf(fmt, prefix, id, arg);
40    return status;
41}
42
43int id_main(int argc, char **argv)
44{
45    struct passwd *p;
46    uid_t uid;
47    gid_t gid;
48    unsigned long flags;
49    short status;
50
51    /* Don't allow -n -r -nr -ug -rug -nug -rnug */
52    /* Don't allow more than one username */
53    bb_opt_complementally = "?1:?:u--g:g--u:r?ug:n?ug";
54    flags = bb_getopt_ulflags(argc, argv, "rnug");
55
56    /* This values could be overwritten later */
57    uid = geteuid();
58    gid = getegid();
59    if (flags & PRINT_REAL) {
60        uid = getuid();
61        gid = getgid();
62    }
63
64    if(argv[optind]) {
65        p=getpwnam(argv[optind]);
66        /* bb_xgetpwnam is needed because it exits on failure */
67        uid = bb_xgetpwnam(argv[optind]);
68        gid = p->pw_gid;
69        /* in this case PRINT_REAL is the same */
70    }
71
72    if(flags & (JUST_GROUP | JUST_USER)) {
73        /* JUST_GROUP and JUST_USER are mutually exclusive */
74        if(flags & NAME_NOT_NUMBER) {
75            /* bb_getpwuid and bb_getgrgid exit on failure so puts cannot segfault */
76            puts((flags & JUST_USER) ? bb_getpwuid(NULL, uid, -1 ) : bb_getgrgid(NULL, gid, -1 ));
77        } else {
78            bb_printf("%u\n",(flags & JUST_USER) ? uid : gid);
79        }
80        /* exit */
81        bb_fflush_stdout_and_exit(EXIT_SUCCESS);
82    }
83
84    /* Print full info like GNU id */
85    /* bb_getpwuid doesn't exit on failure here */
86    status=printf_full(uid, bb_getpwuid(NULL, uid, 0), 'u');
87    putchar(' ');
88    /* bb_getgrgid doesn't exit on failure here */
89    status|=printf_full(gid, bb_getgrgid(NULL, gid, 0), 'g');
90
91#ifdef CONFIG_SELINUX
92    if ( is_selinux_enabled() ) {
93            security_context_t mysid;
94            char context[80];
95            int len = sizeof(context);
96
97            getcon(&mysid);
98            context[0] = '\0';
99            if (mysid) {
100                    len = strlen(mysid)+1;
101                    safe_strncpy(context, mysid, len);
102                    freecon(mysid);
103            }else{
104                    safe_strncpy(context, "unknown",8);
105            }
106        bb_printf(" context=%s", context);
107    }
108#endif
109
110    putchar('\n');
111    bb_fflush_stdout_and_exit(status);
112}
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