[1765] | 1 | /* vi: set sw=4 ts=4: */
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[3621] | 2 | /* Copyright (C) 2014 Tito Ragusa <farmatito@tiscali.it>
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[821] | 3 | *
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[2725] | 4 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 5 | */
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[3621] | 6 | /* This program is distributed in the hope that it will be useful,
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| 7 | * but WITHOUT ANY WARRANTY!!
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[821] | 8 | *
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[3621] | 9 | * Rewrite of some parts. Main differences are:
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[821] | 10 | *
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[3621] | 11 | * 1) the buffer for getpwuid, getgrgid, getpwnam, getgrnam is dynamically
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| 12 | * allocated.
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| 13 | * If ENABLE_FEATURE_CLEAN_UP is set the buffers are freed at program
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| 14 | * exit using the atexit function to make valgrind happy.
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| 15 | * 2) the passwd/group files:
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| 16 | * a) must contain the expected number of fields (as per count of field
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| 17 | * delimeters ":") or we will complain with a error message.
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| 18 | * b) leading and trailing whitespace in fields is stripped.
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| 19 | * c) some fields are not allowed to be empty (e.g. username, uid/gid),
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| 20 | * and in this case NULL is returned and errno is set to EINVAL.
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| 21 | * This behaviour could be easily changed by modifying PW_DEF, GR_DEF,
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| 22 | * SP_DEF strings (uppercase makes a field mandatory).
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| 23 | * d) the string representing uid/gid must be convertible by strtoXX
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| 24 | * functions, or errno is set to EINVAL.
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| 25 | * e) leading and trailing whitespace in group member names is stripped.
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| 26 | * 3) the internal function for getgrouplist uses dynamically allocated buffer.
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| 27 | * 4) at the moment only the functions really used by busybox code are
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| 28 | * implemented, if you need a particular missing function it should be
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| 29 | * easy to write it by using the internal common code.
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[821] | 30 | */
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| 31 |
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| 32 | #include "libbb.h"
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| 33 |
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[3621] | 34 | struct const_passdb {
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| 35 | const char *filename;
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| 36 | char def[7 + 2*ENABLE_USE_BB_SHADOW];
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| 37 | uint8_t off[7 + 2*ENABLE_USE_BB_SHADOW];
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| 38 | uint8_t numfields;
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| 39 | uint8_t size_of;
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| 40 | };
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| 41 | struct passdb {
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| 42 | const char *filename;
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| 43 | char def[7 + 2*ENABLE_USE_BB_SHADOW];
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| 44 | uint8_t off[7 + 2*ENABLE_USE_BB_SHADOW];
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| 45 | uint8_t numfields;
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| 46 | uint8_t size_of;
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| 47 | FILE *fp;
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| 48 | char *malloced;
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| 49 | };
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| 50 | /* Note: for shadow db, def[] will not contain terminating NUL,
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| 51 | * but convert_to_struct() logic detects def[] end by "less than SP?",
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| 52 | * not by "is it NUL?" condition; and off[0] happens to be zero
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| 53 | * for every db anyway, so there _is_ in fact a terminating NUL there.
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| 54 | */
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[821] | 55 |
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[3621] | 56 | /* S = string not empty, s = string maybe empty,
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| 57 | * I = uid,gid, l = long maybe empty, m = members,
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| 58 | * r = reserved
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| 59 | */
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| 60 | #define PW_DEF "SsIIsss"
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| 61 | #define GR_DEF "SsIm"
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| 62 | #define SP_DEF "Ssllllllr"
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[821] | 63 |
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[3621] | 64 | static const struct const_passdb const_pw_db = {
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| 65 | _PATH_PASSWD, PW_DEF,
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| 66 | {
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| 67 | offsetof(struct passwd, pw_name), /* 0 S */
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| 68 | offsetof(struct passwd, pw_passwd), /* 1 s */
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| 69 | offsetof(struct passwd, pw_uid), /* 2 I */
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| 70 | offsetof(struct passwd, pw_gid), /* 3 I */
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| 71 | offsetof(struct passwd, pw_gecos), /* 4 s */
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| 72 | offsetof(struct passwd, pw_dir), /* 5 s */
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| 73 | offsetof(struct passwd, pw_shell) /* 6 s */
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| 74 | },
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| 75 | sizeof(PW_DEF)-1, sizeof(struct passwd)
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| 76 | };
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| 77 | static const struct const_passdb const_gr_db = {
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| 78 | _PATH_GROUP, GR_DEF,
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| 79 | {
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| 80 | offsetof(struct group, gr_name), /* 0 S */
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| 81 | offsetof(struct group, gr_passwd), /* 1 s */
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| 82 | offsetof(struct group, gr_gid), /* 2 I */
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| 83 | offsetof(struct group, gr_mem) /* 3 m (char **) */
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| 84 | },
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| 85 | sizeof(GR_DEF)-1, sizeof(struct group)
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| 86 | };
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[1765] | 87 | #if ENABLE_USE_BB_SHADOW
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[3621] | 88 | static const struct const_passdb const_sp_db = {
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| 89 | _PATH_SHADOW, SP_DEF,
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| 90 | {
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| 91 | offsetof(struct spwd, sp_namp), /* 0 S Login name */
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| 92 | offsetof(struct spwd, sp_pwdp), /* 1 s Encrypted password */
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| 93 | offsetof(struct spwd, sp_lstchg), /* 2 l */
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| 94 | offsetof(struct spwd, sp_min), /* 3 l */
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| 95 | offsetof(struct spwd, sp_max), /* 4 l */
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| 96 | offsetof(struct spwd, sp_warn), /* 5 l */
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| 97 | offsetof(struct spwd, sp_inact), /* 6 l */
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| 98 | offsetof(struct spwd, sp_expire), /* 7 l */
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| 99 | offsetof(struct spwd, sp_flag) /* 8 r Reserved */
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| 100 | },
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| 101 | sizeof(SP_DEF)-1, sizeof(struct spwd)
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| 102 | };
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[1765] | 103 | #endif
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[821] | 104 |
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[1765] | 105 | /* We avoid having big global data. */
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| 106 | struct statics {
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[3621] | 107 | /* We use same buffer (db[0].malloced) for getpwuid and getpwnam.
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| 108 | * Manpage says:
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[3232] | 109 | * "The return value may point to a static area, and may be overwritten
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| 110 | * by subsequent calls to getpwent(), getpwnam(), or getpwuid()."
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| 111 | */
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[3621] | 112 | struct passdb db[2 + ENABLE_USE_BB_SHADOW];
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| 113 | char *tokenize_end;
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| 114 | unsigned string_size;
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[1765] | 115 | };
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| 116 |
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| 117 | static struct statics *ptr_to_statics;
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[3621] | 118 | #define S (*ptr_to_statics)
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| 119 | #define has_S (ptr_to_statics)
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[1765] | 120 |
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[3621] | 121 | #if ENABLE_FEATURE_CLEAN_UP
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| 122 | static void free_static(void)
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| 123 | {
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| 124 | free(S.db[0].malloced);
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| 125 | free(S.db[1].malloced);
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| 126 | # if ENABLE_USE_BB_SHADOW
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| 127 | free(S.db[2].malloced);
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| 128 | # endif
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| 129 | free(ptr_to_statics);
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| 130 | }
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| 131 | #endif
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| 132 |
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[1765] | 133 | static struct statics *get_S(void)
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| 134 | {
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[3621] | 135 | if (!ptr_to_statics) {
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| 136 | ptr_to_statics = xzalloc(sizeof(S));
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| 137 | memcpy(&S.db[0], &const_pw_db, sizeof(const_pw_db));
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| 138 | memcpy(&S.db[1], &const_gr_db, sizeof(const_gr_db));
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| 139 | #if ENABLE_USE_BB_SHADOW
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| 140 | memcpy(&S.db[2], &const_sp_db, sizeof(const_sp_db));
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| 141 | #endif
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| 142 | #if ENABLE_FEATURE_CLEAN_UP
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| 143 | atexit(free_static);
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| 144 | #endif
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| 145 | }
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[1765] | 146 | return ptr_to_statics;
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| 147 | }
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| 148 |
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[3621] | 149 | /* Internal functions */
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[1765] | 150 |
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[3621] | 151 | /* Divide the passwd/group/shadow record in fields
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| 152 | * by substituting the given delimeter
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| 153 | * e.g. ':' or ',' with '\0'.
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| 154 | * Returns the number of fields found.
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| 155 | * Strips leading and trailing whitespace in fields.
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[821] | 156 | */
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[3621] | 157 | static int tokenize(char *buffer, int ch)
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[821] | 158 | {
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[3621] | 159 | char *p = buffer;
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| 160 | char *s = p;
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| 161 | int num_fields = 0;
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[821] | 162 |
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[3621] | 163 | for (;;) {
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| 164 | if (isblank(*s)) {
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| 165 | overlapping_strcpy(s, skip_whitespace(s));
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| 166 | }
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| 167 | if (*p == ch || *p == '\0') {
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| 168 | char *end = p;
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| 169 | while (p != s && isblank(p[-1]))
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| 170 | p--;
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| 171 | if (p != end)
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| 172 | overlapping_strcpy(p, end);
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| 173 | num_fields++;
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| 174 | if (*end == '\0') {
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| 175 | S.tokenize_end = p + 1;
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| 176 | return num_fields;
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| 177 | }
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| 178 | *p = '\0';
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| 179 | s = p + 1;
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| 180 | }
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| 181 | p++;
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[821] | 182 | }
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| 183 | }
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| 184 |
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[3621] | 185 | /* Returns !NULL on success and matching line broken up in fields by '\0' in buf.
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| 186 | * We require the expected number of fields to be found.
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| 187 | */
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| 188 | static char *parse_common(FILE *fp, struct passdb *db,
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| 189 | const char *key, int field_pos)
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[821] | 190 | {
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[3621] | 191 | char *buf;
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[821] | 192 |
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[3621] | 193 | while ((buf = xmalloc_fgetline(fp)) != NULL) {
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| 194 | /* Skip empty lines, comment lines */
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| 195 | if (buf[0] == '\0' || buf[0] == '#')
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| 196 | goto free_and_next;
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| 197 | if (tokenize(buf, ':') != db->numfields) {
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| 198 | /* number of fields is wrong */
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| 199 | bb_error_msg("%s: bad record", db->filename);
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| 200 | goto free_and_next;
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| 201 | }
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[821] | 202 |
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[3621] | 203 | if (field_pos == -1) {
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| 204 | /* no key specified: sequential read, return a record */
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| 205 | break;
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| 206 | }
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| 207 | if (strcmp(key, nth_string(buf, field_pos)) == 0) {
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| 208 | /* record found */
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| 209 | break;
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| 210 | }
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| 211 | free_and_next:
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| 212 | free(buf);
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[821] | 213 | }
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| 214 |
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[3621] | 215 | S.string_size = S.tokenize_end - buf;
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| 216 | /*
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| 217 | * Ugly hack: group db requires additional buffer space
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| 218 | * for members[] array. If there is only one group, we need space
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| 219 | * for 3 pointers: alignment padding, group name, NULL.
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| 220 | * +1 for every additional group.
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| 221 | */
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| 222 | if (buf && db->numfields == sizeof(GR_DEF)-1) { /* if we read group file... */
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| 223 | int cnt = 3;
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| 224 | char *p = buf;
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| 225 | while (p < S.tokenize_end)
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| 226 | if (*p++ == ',')
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| 227 | cnt++;
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| 228 | S.string_size += cnt * sizeof(char*);
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| 229 | //bb_error_msg("+%d words = %u key:%s buf:'%s'", cnt, S.string_size, key, buf);
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| 230 | buf = xrealloc(buf, S.string_size);
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| 231 | }
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| 232 |
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| 233 | return buf;
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[821] | 234 | }
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| 235 |
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[3621] | 236 | static char *parse_file(struct passdb *db,
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| 237 | const char *key, int field_pos)
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[821] | 238 | {
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[3621] | 239 | char *buf = NULL;
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| 240 | FILE *fp = fopen_for_read(db->filename);
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[821] | 241 |
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[3621] | 242 | if (fp) {
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| 243 | buf = parse_common(fp, db, key, field_pos);
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| 244 | fclose(fp);
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[821] | 245 | }
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[3621] | 246 | return buf;
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[821] | 247 | }
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| 248 |
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[3621] | 249 | /* Convert passwd/group/shadow file record in buffer to a struct */
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| 250 | static void *convert_to_struct(struct passdb *db,
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| 251 | char *buffer, void *result)
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[821] | 252 | {
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[3621] | 253 | const char *def = db->def;
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| 254 | const uint8_t *off = db->off;
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[821] | 255 |
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[3621] | 256 | /* For consistency, zero out all fields */
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| 257 | memset(result, 0, db->size_of);
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[821] | 258 |
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[3621] | 259 | for (;;) {
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| 260 | void *member = (char*)result + (*off++);
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[821] | 261 |
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[3621] | 262 | if ((*def | 0x20) == 's') { /* s or S */
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| 263 | *(char **)member = (char*)buffer;
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| 264 | if (!buffer[0] && (*def == 'S')) {
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| 265 | errno = EINVAL;
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| 266 | }
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| 267 | }
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| 268 | if (*def == 'I') {
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| 269 | *(int *)member = bb_strtou(buffer, NULL, 10);
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| 270 | }
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[1765] | 271 | #if ENABLE_USE_BB_SHADOW
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[3621] | 272 | if (*def == 'l') {
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| 273 | long n = -1;
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| 274 | if (buffer[0])
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| 275 | n = bb_strtol(buffer, NULL, 10);
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| 276 | *(long *)member = n;
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| 277 | }
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[821] | 278 | #endif
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[3621] | 279 | if (*def == 'm') {
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| 280 | char **members;
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| 281 | int i = tokenize(buffer, ',');
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[821] | 282 |
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[3621] | 283 | /* Store members[] after buffer's end.
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| 284 | * This is safe ONLY because there is a hack
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| 285 | * in parse_common() which allocates additional space
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| 286 | * at the end of malloced buffer!
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| 287 | */
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| 288 | members = (char **)
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| 289 | ( ((intptr_t)S.tokenize_end + sizeof(members[0]))
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| 290 | & -(intptr_t)sizeof(members[0])
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| 291 | );
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| 292 | ((struct group *)result)->gr_mem = members;
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| 293 | while (--i >= 0) {
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| 294 | if (buffer[0]) {
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| 295 | *members++ = buffer;
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| 296 | // bb_error_msg("member[]='%s'", buffer);
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| 297 | }
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| 298 | buffer += strlen(buffer) + 1;
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| 299 | }
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| 300 | *members = NULL;
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[821] | 301 | }
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[3621] | 302 | /* def "r" does nothing */
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[821] | 303 |
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[3621] | 304 | def++;
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| 305 | if ((unsigned char)*def <= (unsigned char)' ')
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| 306 | break;
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| 307 | buffer += strlen(buffer) + 1;
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[821] | 308 | }
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| 309 |
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[3621] | 310 | if (errno)
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| 311 | result = NULL;
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[821] | 312 | return result;
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| 313 | }
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| 314 |
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[3621] | 315 | static int massage_data_for_r_func(struct passdb *db,
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| 316 | char *buffer, size_t buflen,
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| 317 | void **result,
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| 318 | char *buf)
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[821] | 319 | {
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[3621] | 320 | void *result_buf = *result;
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[821] | 321 | *result = NULL;
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[3621] | 322 | if (buf) {
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| 323 | if (S.string_size > buflen) {
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| 324 | errno = ERANGE;
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| 325 | } else {
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| 326 | memcpy(buffer, buf, S.string_size);
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| 327 | *result = convert_to_struct(db, buffer, result_buf);
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| 328 | }
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| 329 | free(buf);
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[821] | 330 | }
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[3621] | 331 | /* "The reentrant functions return zero on success.
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| 332 | * In case of error, an error number is returned."
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| 333 | * NB: not finding the record is also a "success" here:
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| 334 | */
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| 335 | return errno;
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[821] | 336 | }
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| 337 |
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[3621] | 338 | static void* massage_data_for_non_r_func(struct passdb *db, char *buf)
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[821] | 339 | {
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[3621] | 340 | if (!buf)
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| 341 | return NULL;
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[821] | 342 |
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[3621] | 343 | free(db->malloced);
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| 344 | /* We enlarge buf and move string data up, freeing space
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| 345 | * for struct passwd/group/spwd at the beginning. This way,
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| 346 | * entire result of getXXnam is in a single malloced block.
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| 347 | * This enables easy creation of xmalloc_getpwnam() API.
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| 348 | */
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| 349 | db->malloced = buf = xrealloc(buf, db->size_of + S.string_size);
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| 350 | memmove(buf + db->size_of, buf, S.string_size);
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| 351 | return convert_to_struct(db, buf + db->size_of, buf);
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[821] | 352 | }
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| 353 |
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[3621] | 354 | /****** getXXnam/id_r */
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| 355 |
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| 356 | static int FAST_FUNC getXXnam_r(const char *name, uintptr_t db_and_field_pos,
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| 357 | char *buffer, size_t buflen,
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| 358 | void *result)
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[821] | 359 | {
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[3621] | 360 | char *buf;
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| 361 | struct passdb *db = &get_S()->db[db_and_field_pos >> 2];
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[821] | 362 |
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[3621] | 363 | buf = parse_file(db, name, 0 /*db_and_field_pos & 3*/);
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| 364 | /* "db_and_field_pos & 3" is commented out since so far we don't implement
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| 365 | * getXXXid_r() functions which would use that to pass 2 here */
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| 366 |
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| 367 | return massage_data_for_r_func(db, buffer, buflen, result, buf);
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[821] | 368 | }
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| 369 |
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[3621] | 370 | int FAST_FUNC getpwnam_r(const char *name, struct passwd *struct_buf,
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| 371 | char *buffer, size_t buflen,
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| 372 | struct passwd **result)
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[821] | 373 | {
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[3621] | 374 | /* Why the "store buffer address in result" trick?
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| 375 | * This way, getXXnam_r has the same ABI signature as getpwnam_r,
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| 376 | * hopefully compiler can optimize tail call better in this case.
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| 377 | */
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| 378 | *result = struct_buf;
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| 379 | return getXXnam_r(name, (0 << 2) + 0, buffer, buflen, result);
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[821] | 380 | }
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[3621] | 381 | #if ENABLE_USE_BB_SHADOW
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| 382 | int FAST_FUNC getspnam_r(const char *name, struct spwd *struct_buf, char *buffer, size_t buflen,
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| 383 | struct spwd **result)
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[821] | 384 | {
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[3621] | 385 | *result = struct_buf;
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| 386 | return getXXnam_r(name, (2 << 2) + 0, buffer, buflen, result);
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[821] | 387 | }
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| 388 | #endif
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| 389 |
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[3621] | 390 | #ifdef UNUSED
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| 391 | /****** getXXent_r */
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[821] | 392 |
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[3621] | 393 | static int FAST_FUNC getXXent_r(uintptr_t db_idx, char *buffer, size_t buflen,
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| 394 | void *result)
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---|
| 395 | {
|
---|
| 396 | char *buf;
|
---|
| 397 | struct passdb *db = &get_S()->db[db_idx];
|
---|
[1765] | 398 |
|
---|
[3621] | 399 | if (!db->fp) {
|
---|
| 400 | db->fp = fopen_for_read(db->filename);
|
---|
| 401 | if (!db->fp) {
|
---|
| 402 | return errno;
|
---|
| 403 | }
|
---|
| 404 | close_on_exec_on(fileno(db->fp));
|
---|
| 405 | }
|
---|
[821] | 406 |
|
---|
[3621] | 407 | buf = parse_common(db->fp, db, /*no search key:*/ NULL, -1);
|
---|
| 408 | if (!buf && !errno)
|
---|
| 409 | errno = ENOENT;
|
---|
| 410 | return massage_data_for_r_func(db, buffer, buflen, result, buf);
|
---|
[821] | 411 | }
|
---|
| 412 |
|
---|
[3621] | 413 | int FAST_FUNC getpwent_r(struct passwd *struct_buf, char *buffer, size_t buflen,
|
---|
| 414 | struct passwd **result)
|
---|
[821] | 415 | {
|
---|
[3621] | 416 | *result = struct_buf;
|
---|
| 417 | return getXXent_r(0, buffer, buflen, result);
|
---|
[821] | 418 | }
|
---|
[3621] | 419 | #endif
|
---|
[821] | 420 |
|
---|
[3621] | 421 | /****** getXXent */
|
---|
[821] | 422 |
|
---|
[3621] | 423 | static void* FAST_FUNC getXXent(uintptr_t db_idx)
|
---|
[821] | 424 | {
|
---|
[3621] | 425 | char *buf;
|
---|
| 426 | struct passdb *db = &get_S()->db[db_idx];
|
---|
[821] | 427 |
|
---|
[3621] | 428 | if (!db->fp) {
|
---|
| 429 | db->fp = fopen_for_read(db->filename);
|
---|
| 430 | if (!db->fp) {
|
---|
| 431 | return NULL;
|
---|
[821] | 432 | }
|
---|
[3621] | 433 | close_on_exec_on(fileno(db->fp));
|
---|
[821] | 434 | }
|
---|
| 435 |
|
---|
[3621] | 436 | buf = parse_common(db->fp, db, /*no search key:*/ NULL, -1);
|
---|
| 437 | return massage_data_for_non_r_func(db, buf);
|
---|
[821] | 438 | }
|
---|
| 439 |
|
---|
[3621] | 440 | struct passwd* FAST_FUNC getpwent(void)
|
---|
[821] | 441 | {
|
---|
[3621] | 442 | return getXXent(0);
|
---|
[821] | 443 | }
|
---|
| 444 |
|
---|
[3621] | 445 | /****** getXXnam/id */
|
---|
[821] | 446 |
|
---|
[3621] | 447 | static void* FAST_FUNC getXXnam(const char *name, unsigned db_and_field_pos)
|
---|
[821] | 448 | {
|
---|
[3621] | 449 | char *buf;
|
---|
| 450 | struct passdb *db = &get_S()->db[db_and_field_pos >> 2];
|
---|
[821] | 451 |
|
---|
[3621] | 452 | buf = parse_file(db, name, db_and_field_pos & 3);
|
---|
| 453 | return massage_data_for_non_r_func(db, buf);
|
---|
[821] | 454 | }
|
---|
| 455 |
|
---|
[3621] | 456 | struct passwd* FAST_FUNC getpwnam(const char *name)
|
---|
[821] | 457 | {
|
---|
[3621] | 458 | return getXXnam(name, (0 << 2) + 0);
|
---|
[821] | 459 | }
|
---|
[3621] | 460 | struct group* FAST_FUNC getgrnam(const char *name)
|
---|
[821] | 461 | {
|
---|
[3621] | 462 | return getXXnam(name, (1 << 2) + 0);
|
---|
[821] | 463 | }
|
---|
[3621] | 464 | struct passwd* FAST_FUNC getpwuid(uid_t id)
|
---|
[821] | 465 | {
|
---|
[3621] | 466 | return getXXnam(utoa(id), (0 << 2) + 2);
|
---|
[821] | 467 | }
|
---|
[3621] | 468 | struct group* FAST_FUNC getgrgid(gid_t id)
|
---|
[821] | 469 | {
|
---|
[3621] | 470 | return getXXnam(utoa(id), (1 << 2) + 2);
|
---|
[821] | 471 | }
|
---|
| 472 |
|
---|
[3621] | 473 | /****** end/setXXend */
|
---|
| 474 |
|
---|
| 475 | void FAST_FUNC endpwent(void)
|
---|
[821] | 476 | {
|
---|
[3621] | 477 | if (has_S && S.db[0].fp) {
|
---|
| 478 | fclose(S.db[0].fp);
|
---|
| 479 | S.db[0].fp = NULL;
|
---|
| 480 | }
|
---|
[821] | 481 | }
|
---|
[3621] | 482 | void FAST_FUNC setpwent(void)
|
---|
[821] | 483 | {
|
---|
[3621] | 484 | if (has_S && S.db[0].fp) {
|
---|
| 485 | rewind(S.db[0].fp);
|
---|
| 486 | }
|
---|
[821] | 487 | }
|
---|
[3621] | 488 | void FAST_FUNC endgrent(void)
|
---|
[821] | 489 | {
|
---|
[3621] | 490 | if (has_S && S.db[1].fp) {
|
---|
| 491 | fclose(S.db[1].fp);
|
---|
| 492 | S.db[1].fp = NULL;
|
---|
| 493 | }
|
---|
[821] | 494 | }
|
---|
| 495 |
|
---|
[3621] | 496 | /****** initgroups and getgrouplist */
|
---|
| 497 |
|
---|
| 498 | static gid_t* FAST_FUNC getgrouplist_internal(int *ngroups_ptr,
|
---|
| 499 | const char *user, gid_t gid)
|
---|
[821] | 500 | {
|
---|
[3621] | 501 | FILE *fp;
|
---|
[821] | 502 | gid_t *group_list;
|
---|
[2725] | 503 | int ngroups;
|
---|
[821] | 504 |
|
---|
| 505 | /* We alloc space for 8 gids at a time. */
|
---|
[3621] | 506 | group_list = xzalloc(8 * sizeof(group_list[0]));
|
---|
[2725] | 507 | group_list[0] = gid;
|
---|
| 508 | ngroups = 1;
|
---|
[821] | 509 |
|
---|
[3621] | 510 | fp = fopen_for_read(_PATH_GROUP);
|
---|
| 511 | if (fp) {
|
---|
| 512 | struct passdb *db = &get_S()->db[1];
|
---|
| 513 | char *buf;
|
---|
| 514 | while ((buf = parse_common(fp, db, NULL, -1)) != NULL) {
|
---|
[2725] | 515 | char **m;
|
---|
[3621] | 516 | struct group group;
|
---|
| 517 | if (!convert_to_struct(db, buf, &group))
|
---|
| 518 | goto next;
|
---|
[2725] | 519 | if (group.gr_gid == gid)
|
---|
[3621] | 520 | goto next;
|
---|
[2725] | 521 | for (m = group.gr_mem; *m; m++) {
|
---|
| 522 | if (strcmp(*m, user) != 0)
|
---|
| 523 | continue;
|
---|
| 524 | group_list = xrealloc_vector(group_list, /*8=2^3:*/ 3, ngroups);
|
---|
| 525 | group_list[ngroups++] = group.gr_gid;
|
---|
[3621] | 526 | goto next;
|
---|
[821] | 527 | }
|
---|
[3621] | 528 | next:
|
---|
| 529 | free(buf);
|
---|
[821] | 530 | }
|
---|
[3621] | 531 | fclose(fp);
|
---|
[821] | 532 | }
|
---|
[2725] | 533 | *ngroups_ptr = ngroups;
|
---|
| 534 | return group_list;
|
---|
| 535 | }
|
---|
[821] | 536 |
|
---|
[3621] | 537 | int FAST_FUNC initgroups(const char *user, gid_t gid)
|
---|
[2725] | 538 | {
|
---|
| 539 | int ngroups;
|
---|
| 540 | gid_t *group_list = getgrouplist_internal(&ngroups, user, gid);
|
---|
| 541 |
|
---|
| 542 | ngroups = setgroups(ngroups, group_list);
|
---|
[821] | 543 | free(group_list);
|
---|
[2725] | 544 | return ngroups;
|
---|
[821] | 545 | }
|
---|
| 546 |
|
---|
[3621] | 547 | int FAST_FUNC getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups)
|
---|
[2725] | 548 | {
|
---|
| 549 | int ngroups_old = *ngroups;
|
---|
| 550 | gid_t *group_list = getgrouplist_internal(ngroups, user, gid);
|
---|
| 551 |
|
---|
| 552 | if (*ngroups <= ngroups_old) {
|
---|
| 553 | ngroups_old = *ngroups;
|
---|
| 554 | memcpy(groups, group_list, ngroups_old * sizeof(groups[0]));
|
---|
| 555 | } else {
|
---|
| 556 | ngroups_old = -1;
|
---|
| 557 | }
|
---|
| 558 | free(group_list);
|
---|
| 559 | return ngroups_old;
|
---|
| 560 | }
|
---|