| 1 | /* Copyright (C) 2003 Manuel Novoa III
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| 2 | *
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| 3 | * Licensed under GPL v2, or later. See file LICENSE in this tarball.
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| 4 | */
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| 5 |
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| 6 | /* Nov 6, 2003 Initial version.
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| 7 | *
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| 8 | * NOTE: This implementation is quite strict about requiring all
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| 9 | * field seperators. It also does not allow leading whitespace
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| 10 | * except when processing the numeric fields. glibc is more
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| 11 | * lenient. See the various glibc difference comments below.
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| 12 | *
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| 13 | * TODO:
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| 14 | * Move to dynamic allocation of (currently statically allocated)
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| 15 | * buffers; especially for the group-related functions since
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| 16 | * large group member lists will cause error returns.
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| 17 | *
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| 18 | */
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| 19 |
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| 20 | #include <features.h>
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| 21 | #include <stdio.h>
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| 22 | #include <stdlib.h>
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| 23 | #include <stdint.h>
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| 24 | #include <string.h>
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| 25 | #include <stddef.h>
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| 26 | #include <errno.h>
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| 27 | #include <assert.h>
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| 28 | #include <ctype.h>
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| 29 |
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| 30 | #include "pwd_.h"
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| 31 | #include "grp_.h"
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| 32 | #include "shadow_.h"
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| 33 | #include "libbb.h"
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| 34 |
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| 35 | #ifndef _PATH_SHADOW
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| 36 | #define _PATH_SHADOW "/etc/shadow"
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| 37 | #endif
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| 38 | #ifndef _PATH_PASSWD
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| 39 | #define _PATH_PASSWD "/etc/passwd"
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| 40 | #endif
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| 41 | #ifndef _PATH_GROUP
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| 42 | #define _PATH_GROUP "/etc/group"
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| 43 | #endif
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| 44 |
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| 45 | /**********************************************************************/
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| 46 | /* Sizes for statically allocated buffers. */
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| 47 |
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| 48 | /* If you change these values, also change _SC_GETPW_R_SIZE_MAX and
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| 49 | * _SC_GETGR_R_SIZE_MAX in libc/unistd/sysconf.c to match */
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| 50 | #define PWD_BUFFER_SIZE 256
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| 51 | #define GRP_BUFFER_SIZE 256
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| 52 |
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| 53 | /**********************************************************************/
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| 54 | /* Prototypes for internal functions. */
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| 55 |
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| 56 | extern int __parsepwent(void *pw, char *line);
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| 57 | extern int __parsegrent(void *gr, char *line);
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| 58 | extern int __parsespent(void *sp, char *line);
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| 59 |
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| 60 | extern int __pgsreader(int (*__parserfunc)(void *d, char *line), void *data,
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| 61 | char *__restrict line_buff, size_t buflen, FILE *f);
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| 62 |
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| 63 |
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| 64 | #ifndef GETXXKEY_R_FUNC
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| 65 | #error GETXXKEY_R_FUNC is not defined!
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| 66 | #endif
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| 67 | /**********************************************************************/
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| 68 | #ifdef GETXXKEY_R_FUNC
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| 69 |
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| 70 | int GETXXKEY_R_FUNC(DO_GETXXKEY_R_KEYTYPE key,
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| 71 | GETXXKEY_R_ENTTYPE *__restrict resultbuf,
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| 72 | char *__restrict buffer, size_t buflen,
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| 73 | GETXXKEY_R_ENTTYPE **__restrict result)
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| 74 | {
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| 75 | FILE *stream;
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| 76 | int rv;
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| 77 |
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| 78 | *result = NULL;
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| 79 |
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| 80 | if (!(stream = fopen(DO_GETXXKEY_R_PATHNAME, "r"))) {
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| 81 | rv = errno;
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| 82 | } else {
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| 83 | do {
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| 84 | if (!(rv = __pgsreader(GETXXKEY_R_PARSER, resultbuf,
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| 85 | buffer, buflen, stream))
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| 86 | ) {
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| 87 | if (GETXXKEY_R_TEST(resultbuf)) { /* Found key? */
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| 88 | *result = resultbuf;
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| 89 | break;
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| 90 | }
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| 91 | } else {
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| 92 | if (rv == ENOENT) { /* end-of-file encountered. */
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| 93 | rv = 0;
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| 94 | }
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| 95 | break;
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| 96 | }
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| 97 | } while (1);
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| 98 | fclose(stream);
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| 99 | }
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| 100 |
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| 101 | return rv;
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| 102 | }
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| 103 |
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| 104 | #endif
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| 105 | /**********************************************************************/
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| 106 | #undef GETXXKEY_R_FUNC
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| 107 | #undef GETXXKEY_R_PARSER
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| 108 | #undef GETXXKEY_R_ENTTYPE
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| 109 | #undef GETXXKEY_R_TEST
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| 110 | #undef DO_GETXXKEY_R_KEYTYPE
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| 111 | #undef DO_GETXXKEY_R_PATHNAME
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| 112 |
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