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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