Ignore:
Timestamp:
Dec 20, 2016, 4:07:32 PM (7 years ago)
Author:
Bruno Cornec
Message:

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.

Location:
branches/3.3
Files:
1 edited
1 copied

Legend:

Unmodified
Added
Removed

  • branches/3.3/mindi-busybox/libpwdgrp/pwd_grp.c

    r3232 r3621  
    11/* vi: set sw=4 ts=4: */
    2 /* Copyright (C) 2003     Manuel Novoa III
     2/* Copyright (C) 2014 Tito Ragusa <farmatito@tiscali.it>
    33 *
    44 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
    55 */
    6 
    7 /* Nov 6, 2003  Initial version.
     6/* This program is distributed in the hope that it will be useful,
     7 * but WITHOUT ANY WARRANTY!!
    88 *
    9  * NOTE: This implementation is quite strict about requiring all
    10  *    field seperators.  It also does not allow leading whitespace
    11  *    except when processing the numeric fields.  glibc is more
    12  *    lenient.  See the various glibc difference comments below.
     9 * Rewrite of some parts. Main differences are:
    1310 *
    14  * TODO:
    15  *    Move to dynamic allocation of (currently statically allocated)
    16  *      buffers; especially for the group-related functions since
    17  *      large group member lists will cause error returns.
     11 * 1) the buffer for getpwuid, getgrgid, getpwnam, getgrnam is dynamically
     12 *    allocated.
     13 *    If ENABLE_FEATURE_CLEAN_UP is set the buffers are freed at program
     14 *    exit using the atexit function to make valgrind happy.
     15 * 2) the passwd/group files:
     16 *      a) must contain the expected number of fields (as per count of field
     17 *         delimeters ":") or we will complain with a error message.
     18 *      b) leading and trailing whitespace in fields is stripped.
     19 *      c) some fields are not allowed to be empty (e.g. username, uid/gid),
     20 *         and in this case NULL is returned and errno is set to EINVAL.
     21 *         This behaviour could be easily changed by modifying PW_DEF, GR_DEF,
     22 *         SP_DEF strings (uppercase makes a field mandatory).
     23 *      d) the string representing uid/gid must be convertible by strtoXX
     24 *         functions, or errno is set to EINVAL.
     25 *      e) leading and trailing whitespace in group member names is stripped.
     26 * 3) the internal function for getgrouplist uses dynamically allocated buffer.
     27 * 4) at the moment only the functions really used by busybox code are
     28 *    implemented, if you need a particular missing function it should be
     29 *    easy to write it by using the internal common code.
    1830 */
    1931
    2032#include "libbb.h"
    21 #include <assert.h>
    22 
    23 /**********************************************************************/
    24 /* Sizes for statically allocated buffers. */
    25 
    26 #define PWD_BUFFER_SIZE 256
    27 #define GRP_BUFFER_SIZE 256
    28 
    29 /**********************************************************************/
    30 /* Prototypes for internal functions. */
    31 
    32 static int bb__pgsreader(
    33         int FAST_FUNC (*parserfunc)(void *d, char *line),
    34         void *data,
    35         char *__restrict line_buff,
    36         size_t buflen,
    37         FILE *f);
    38 
    39 static int FAST_FUNC bb__parsepwent(void *pw, char *line);
    40 static int FAST_FUNC bb__parsegrent(void *gr, char *line);
     33
     34struct const_passdb {
     35    const char *filename;
     36    char def[7 + 2*ENABLE_USE_BB_SHADOW];
     37    uint8_t off[7 + 2*ENABLE_USE_BB_SHADOW];
     38    uint8_t numfields;
     39    uint8_t size_of;
     40};
     41struct passdb {
     42    const char *filename;
     43    char def[7 + 2*ENABLE_USE_BB_SHADOW];
     44    uint8_t off[7 + 2*ENABLE_USE_BB_SHADOW];
     45    uint8_t numfields;
     46    uint8_t size_of;
     47    FILE *fp;
     48    char *malloced;
     49};
     50/* Note: for shadow db, def[] will not contain terminating NUL,
     51 * but convert_to_struct() logic detects def[] end by "less than SP?",
     52 * not by "is it NUL?" condition; and off[0] happens to be zero
     53 * for every db anyway, so there _is_ in fact a terminating NUL there.
     54 */
     55
     56/* S = string not empty, s = string maybe empty,
     57 * I = uid,gid, l = long maybe empty, m = members,
     58 * r = reserved
     59 */
     60#define PW_DEF "SsIIsss"
     61#define GR_DEF "SsIm"
     62#define SP_DEF "Ssllllllr"
     63
     64static const struct const_passdb const_pw_db = {
     65    _PATH_PASSWD, PW_DEF,
     66    {
     67        offsetof(struct passwd, pw_name),       /* 0 S */
     68        offsetof(struct passwd, pw_passwd),     /* 1 s */
     69        offsetof(struct passwd, pw_uid),        /* 2 I */
     70        offsetof(struct passwd, pw_gid),        /* 3 I */
     71        offsetof(struct passwd, pw_gecos),      /* 4 s */
     72        offsetof(struct passwd, pw_dir),        /* 5 s */
     73        offsetof(struct passwd, pw_shell)       /* 6 s */
     74    },
     75    sizeof(PW_DEF)-1, sizeof(struct passwd)
     76};
     77static const struct const_passdb const_gr_db = {
     78    _PATH_GROUP, GR_DEF,
     79    {
     80        offsetof(struct group, gr_name),        /* 0 S */
     81        offsetof(struct group, gr_passwd),      /* 1 s */
     82        offsetof(struct group, gr_gid),         /* 2 I */
     83        offsetof(struct group, gr_mem)          /* 3 m (char **) */
     84    },
     85    sizeof(GR_DEF)-1, sizeof(struct group)
     86};
    4187#if ENABLE_USE_BB_SHADOW
    42 static int FAST_FUNC bb__parsespent(void *sp, char *line);
    43 #endif
    44 
    45 /**********************************************************************/
     88static const struct const_passdb const_sp_db = {
     89    _PATH_SHADOW, SP_DEF,
     90    {
     91        offsetof(struct spwd, sp_namp),         /* 0 S Login name */
     92        offsetof(struct spwd, sp_pwdp),         /* 1 s Encrypted password */
     93        offsetof(struct spwd, sp_lstchg),       /* 2 l */
     94        offsetof(struct spwd, sp_min),          /* 3 l */
     95        offsetof(struct spwd, sp_max),          /* 4 l */
     96        offsetof(struct spwd, sp_warn),         /* 5 l */
     97        offsetof(struct spwd, sp_inact),        /* 6 l */
     98        offsetof(struct spwd, sp_expire),       /* 7 l */
     99        offsetof(struct spwd, sp_flag)          /* 8 r Reserved */
     100    },
     101    sizeof(SP_DEF)-1, sizeof(struct spwd)
     102};
     103#endif
     104
    46105/* We avoid having big global data. */
    47 
    48106struct statics {
    49     /* Smaller things first */
    50     /* It's ok to use one buffer for getpwuid and getpwnam. Manpage says:
     107    /* We use same buffer (db[0].malloced) for getpwuid and getpwnam.
     108     * Manpage says:
    51109     * "The return value may point to a static area, and may be overwritten
    52110     * by subsequent calls to getpwent(), getpwnam(), or getpwuid()."
    53111     */
    54     struct passwd getpw_resultbuf;
    55     struct group getgr_resultbuf;
    56 
    57     char getpw_buffer[PWD_BUFFER_SIZE];
    58     char getgr_buffer[GRP_BUFFER_SIZE];
    59 #if 0 //ENABLE_USE_BB_SHADOW
    60     struct spwd getsp_resultbuf;
    61     char getsp_buffer[PWD_BUFFER_SIZE];
    62 #endif
    63 // Not converted - too small to bother
    64 //pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
    65 //FILE *pwf /*= NULL*/;
    66 //FILE *grf /*= NULL*/;
    67 //FILE *spf /*= NULL*/;
     112    struct passdb db[2 + ENABLE_USE_BB_SHADOW];
     113    char *tokenize_end;
     114    unsigned string_size;
    68115};
    69116
    70117static struct statics *ptr_to_statics;
     118#define S     (*ptr_to_statics)
     119#define has_S (ptr_to_statics)
     120
     121#if ENABLE_FEATURE_CLEAN_UP
     122static void free_static(void)
     123{
     124    free(S.db[0].malloced);
     125    free(S.db[1].malloced);
     126# if ENABLE_USE_BB_SHADOW
     127    free(S.db[2].malloced);
     128# endif
     129    free(ptr_to_statics);
     130}
     131#endif
    71132
    72133static struct statics *get_S(void)
    73134{
    74     if (!ptr_to_statics)
    75         ptr_to_statics = xzalloc(sizeof(*ptr_to_statics));
     135    if (!ptr_to_statics) {
     136        ptr_to_statics = xzalloc(sizeof(S));
     137        memcpy(&S.db[0], &const_pw_db, sizeof(const_pw_db));
     138        memcpy(&S.db[1], &const_gr_db, sizeof(const_gr_db));
     139#if ENABLE_USE_BB_SHADOW
     140        memcpy(&S.db[2], &const_sp_db, sizeof(const_sp_db));
     141#endif
     142#if ENABLE_FEATURE_CLEAN_UP
     143        atexit(free_static);
     144#endif
     145    }
    76146    return ptr_to_statics;
    77147}
    78148
    79 /* Always use in this order, get_S() must be called first */
    80 #define RESULTBUF(name) &((S = get_S())->name##_resultbuf)
    81 #define BUFFER(name)    (S->name##_buffer)
    82 
    83 /**********************************************************************/
    84 /* For the various fget??ent_r funcs, return
    85  *
    86  *  0: success
    87  *  ENOENT: end-of-file encountered
    88  *  ERANGE: buflen too small
    89  *  other error values possible. See bb__pgsreader.
    90  *
    91  * Also, *result == resultbuf on success and NULL on failure.
    92  *
    93  * NOTE: glibc difference - For the ENOENT case, glibc also sets errno.
    94  *   We do not, as it really isn't an error if we reach the end-of-file.
    95  *   Doing so is analogous to having fgetc() set errno on EOF.
    96  */
    97 /**********************************************************************/
    98 
    99 int fgetpwent_r(FILE *__restrict stream, struct passwd *__restrict resultbuf,
    100                 char *__restrict buffer, size_t buflen,
    101                 struct passwd **__restrict result)
    102 {
    103     int rv;
    104 
     149/* Internal functions */
     150
     151/* Divide the passwd/group/shadow record in fields
     152 * by substituting the given delimeter
     153 * e.g. ':' or ',' with '\0'.
     154 * Returns the number of fields found.
     155 * Strips leading and trailing whitespace in fields.
     156 */
     157static int tokenize(char *buffer, int ch)
     158{
     159    char *p = buffer;
     160    char *s = p;
     161    int num_fields = 0;
     162
     163    for (;;) {
     164        if (isblank(*s)) {
     165            overlapping_strcpy(s, skip_whitespace(s));
     166        }
     167        if (*p == ch || *p == '\0') {
     168            char *end = p;
     169            while (p != s && isblank(p[-1]))
     170                p--;
     171            if (p != end)
     172                overlapping_strcpy(p, end);
     173            num_fields++;
     174            if (*end == '\0') {
     175                S.tokenize_end = p + 1;
     176                return num_fields;
     177            }
     178            *p = '\0';
     179            s = p + 1;
     180        }
     181        p++;
     182    }
     183}
     184
     185/* Returns !NULL on success and matching line broken up in fields by '\0' in buf.
     186 * We require the expected number of fields to be found.
     187 */
     188static char *parse_common(FILE *fp, struct passdb *db,
     189        const char *key, int field_pos)
     190{
     191    char *buf;
     192
     193    while ((buf = xmalloc_fgetline(fp)) != NULL) {
     194        /* Skip empty lines, comment lines */
     195        if (buf[0] == '\0' || buf[0] == '#')
     196            goto free_and_next;
     197        if (tokenize(buf, ':') != db->numfields) {
     198            /* number of fields is wrong */
     199            bb_error_msg("%s: bad record", db->filename);
     200            goto free_and_next;
     201        }
     202
     203        if (field_pos == -1) {
     204            /* no key specified: sequential read, return a record */
     205            break;
     206        }
     207        if (strcmp(key, nth_string(buf, field_pos)) == 0) {
     208            /* record found */
     209            break;
     210        }
     211 free_and_next:
     212        free(buf);
     213    }
     214
     215    S.string_size = S.tokenize_end - buf;
     216/*
     217 * Ugly hack: group db requires additional buffer space
     218 * for members[] array. If there is only one group, we need space
     219 * for 3 pointers: alignment padding, group name, NULL.
     220 * +1 for every additional group.
     221 */
     222    if (buf && db->numfields == sizeof(GR_DEF)-1) { /* if we read group file... */
     223        int cnt = 3;
     224        char *p = buf;
     225        while (p < S.tokenize_end)
     226            if (*p++ == ',')
     227                cnt++;
     228        S.string_size += cnt * sizeof(char*);
     229//bb_error_msg("+%d words = %u key:%s buf:'%s'", cnt, S.string_size, key, buf);
     230        buf = xrealloc(buf, S.string_size);
     231    }
     232
     233    return buf;
     234}
     235
     236static char *parse_file(struct passdb *db,
     237        const char *key, int field_pos)
     238{
     239    char *buf = NULL;
     240    FILE *fp = fopen_for_read(db->filename);
     241
     242    if (fp) {
     243        buf = parse_common(fp, db, key, field_pos);
     244        fclose(fp);
     245    }
     246    return buf;
     247}
     248
     249/* Convert passwd/group/shadow file record in buffer to a struct */
     250static void *convert_to_struct(struct passdb *db,
     251        char *buffer, void *result)
     252{
     253    const char *def = db->def;
     254    const uint8_t *off = db->off;
     255
     256    /* For consistency, zero out all fields */
     257    memset(result, 0, db->size_of);
     258
     259    for (;;) {
     260        void *member = (char*)result + (*off++);
     261
     262        if ((*def | 0x20) == 's') { /* s or S */
     263            *(char **)member = (char*)buffer;
     264            if (!buffer[0] && (*def == 'S')) {
     265                errno = EINVAL;
     266            }
     267        }
     268        if (*def == 'I') {
     269            *(int *)member = bb_strtou(buffer, NULL, 10);
     270        }
     271#if ENABLE_USE_BB_SHADOW
     272        if (*def == 'l') {
     273            long n = -1;
     274            if (buffer[0])
     275                n = bb_strtol(buffer, NULL, 10);
     276            *(long *)member = n;
     277        }
     278#endif
     279        if (*def == 'm') {
     280            char **members;
     281            int i = tokenize(buffer, ',');
     282
     283            /* Store members[] after buffer's end.
     284             * This is safe ONLY because there is a hack
     285             * in parse_common() which allocates additional space
     286             * at the end of malloced buffer!
     287             */
     288            members = (char **)
     289                ( ((intptr_t)S.tokenize_end + sizeof(members[0]))
     290                & -(intptr_t)sizeof(members[0])
     291                );
     292            ((struct group *)result)->gr_mem = members;
     293            while (--i >= 0) {
     294                if (buffer[0]) {
     295                    *members++ = buffer;
     296                    // bb_error_msg("member[]='%s'", buffer);
     297                }
     298                buffer += strlen(buffer) + 1;
     299            }
     300            *members = NULL;
     301        }
     302        /* def "r" does nothing */
     303
     304        def++;
     305        if ((unsigned char)*def <= (unsigned char)' ')
     306            break;
     307        buffer += strlen(buffer) + 1;
     308    }
     309
     310    if (errno)
     311        result = NULL;
     312    return result;
     313}
     314
     315static int massage_data_for_r_func(struct passdb *db,
     316        char *buffer, size_t buflen,
     317        void **result,
     318        char *buf)
     319{
     320    void *result_buf = *result;
    105321    *result = NULL;
    106 
    107     rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, stream);
    108     if (!rv) {
    109         *result = resultbuf;
    110     }
    111 
    112     return rv;
    113 }
    114 
    115 int fgetgrent_r(FILE *__restrict stream, struct group *__restrict resultbuf,
    116                 char *__restrict buffer, size_t buflen,
    117                 struct group **__restrict result)
    118 {
    119     int rv;
    120 
    121     *result = NULL;
    122 
    123     rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, stream);
    124     if (!rv) {
    125         *result = resultbuf;
    126     }
    127 
    128     return rv;
    129 }
    130 
     322    if (buf) {
     323        if (S.string_size > buflen) {
     324            errno = ERANGE;
     325        } else {
     326            memcpy(buffer, buf, S.string_size);
     327            *result = convert_to_struct(db, buffer, result_buf);
     328        }
     329        free(buf);
     330    }
     331    /* "The reentrant functions return zero on success.
     332     * In case of error, an error number is returned."
     333     * NB: not finding the record is also a "success" here:
     334     */
     335    return errno;
     336}
     337
     338static void* massage_data_for_non_r_func(struct passdb *db, char *buf)
     339{
     340    if (!buf)
     341        return NULL;
     342
     343    free(db->malloced);
     344    /* We enlarge buf and move string data up, freeing space
     345     * for struct passwd/group/spwd at the beginning. This way,
     346     * entire result of getXXnam is in a single malloced block.
     347     * This enables easy creation of xmalloc_getpwnam() API.
     348     */
     349    db->malloced = buf = xrealloc(buf, db->size_of + S.string_size);
     350    memmove(buf + db->size_of, buf, S.string_size);
     351    return convert_to_struct(db, buf + db->size_of, buf);
     352}
     353
     354/****** getXXnam/id_r */
     355
     356static int FAST_FUNC getXXnam_r(const char *name, uintptr_t db_and_field_pos,
     357        char *buffer, size_t buflen,
     358        void *result)
     359{
     360    char *buf;
     361    struct passdb *db = &get_S()->db[db_and_field_pos >> 2];
     362
     363    buf = parse_file(db, name, 0 /*db_and_field_pos & 3*/);
     364    /* "db_and_field_pos & 3" is commented out since so far we don't implement
     365     * getXXXid_r() functions which would use that to pass 2 here */
     366
     367    return massage_data_for_r_func(db, buffer, buflen, result, buf);
     368}
     369
     370int FAST_FUNC getpwnam_r(const char *name, struct passwd *struct_buf,
     371        char *buffer, size_t buflen,
     372        struct passwd **result)
     373{
     374    /* Why the "store buffer address in result" trick?
     375     * This way, getXXnam_r has the same ABI signature as getpwnam_r,
     376     * hopefully compiler can optimize tail call better in this case.
     377     */
     378    *result = struct_buf;
     379    return getXXnam_r(name, (0 << 2) + 0, buffer, buflen, result);
     380}
    131381#if ENABLE_USE_BB_SHADOW
    132 #ifdef UNUSED_FOR_NOW
    133 int fgetspent_r(FILE *__restrict stream, struct spwd *__restrict resultbuf,
    134                 char *__restrict buffer, size_t buflen,
    135                 struct spwd **__restrict result)
    136 {
    137     int rv;
    138 
    139     *result = NULL;
    140 
    141     rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, stream);
    142     if (!rv) {
    143         *result = resultbuf;
    144     }
    145 
    146     return rv;
    147 }
    148 #endif
    149 #endif
    150 
    151 /**********************************************************************/
    152 /* For the various fget??ent funcs, return NULL on failure and a
    153  * pointer to the appropriate struct (statically allocated) on success.
    154  * TODO: audit & stop using these in bbox, they pull in static buffers */
    155 /**********************************************************************/
    156 
    157 #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
    158 struct passwd *fgetpwent(FILE *stream)
    159 {
    160     struct statics *S;
    161     struct passwd *resultbuf = RESULTBUF(getpw);
    162     char *buffer = BUFFER(getpw);
    163     struct passwd *result;
    164 
    165     fgetpwent_r(stream, resultbuf, buffer, sizeof(BUFFER(getpw)), &result);
    166     return result;
    167 }
    168 
    169 struct group *fgetgrent(FILE *stream)
    170 {
    171     struct statics *S;
    172     struct group *resultbuf = RESULTBUF(getgr);
    173     char *buffer = BUFFER(getgr);
    174     struct group *result;
    175 
    176     fgetgrent_r(stream, resultbuf, buffer, sizeof(BUFFER(getgr)), &result);
    177     return result;
    178 }
    179 #endif
    180 
    181 #if ENABLE_USE_BB_SHADOW
    182 #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
    183 struct spwd *fgetspent(FILE *stream)
    184 {
    185     struct statics *S;
    186     struct spwd *resultbuf = RESULTBUF(getsp);
    187     char *buffer = BUFFER(getsp);
    188     struct spwd *result;
    189 
    190     fgetspent_r(stream, resultbuf, buffer, sizeof(BUFFER(getsp)), &result);
    191     return result;
    192 }
    193 #endif
    194 
    195 #ifdef UNUSED_FOR_NOW
    196 int sgetspent_r(const char *string, struct spwd *result_buf,
    197                 char *buffer, size_t buflen, struct spwd **result)
    198 {
    199     int rv = ERANGE;
    200 
    201     *result = NULL;
    202 
    203     if (buflen < PWD_BUFFER_SIZE) {
    204  DO_ERANGE:
    205         errno = rv;
    206         goto DONE;
    207     }
    208 
    209     if (string != buffer) {
    210         if (strlen(string) >= buflen) {
    211             goto DO_ERANGE;
    212         }
    213         strcpy(buffer, string);
    214     }
    215 
    216     rv = bb__parsespent(result_buf, buffer);
    217     if (!rv) {
    218         *result = result_buf;
    219     }
    220 
    221  DONE:
    222     return rv;
    223 }
    224 #endif
    225 #endif /* ENABLE_USE_BB_SHADOW */
    226 
    227 /**********************************************************************/
    228 
    229 #define GETXXKEY_R_FUNC         getpwnam_r
    230 #define GETXXKEY_R_PARSER       bb__parsepwent
    231 #define GETXXKEY_R_ENTTYPE      struct passwd
    232 #define GETXXKEY_R_TEST(ENT)    (!strcmp((ENT)->pw_name, key))
    233 #define GETXXKEY_R_KEYTYPE      const char *__restrict
    234 #define GETXXKEY_R_PATHNAME     _PATH_PASSWD
    235 #include "pwd_grp_internal.c"
    236 
    237 #define GETXXKEY_R_FUNC         getgrnam_r
    238 #define GETXXKEY_R_PARSER       bb__parsegrent
    239 #define GETXXKEY_R_ENTTYPE      struct group
    240 #define GETXXKEY_R_TEST(ENT)    (!strcmp((ENT)->gr_name, key))
    241 #define GETXXKEY_R_KEYTYPE      const char *__restrict
    242 #define GETXXKEY_R_PATHNAME     _PATH_GROUP
    243 #include "pwd_grp_internal.c"
    244 
    245 #if ENABLE_USE_BB_SHADOW
    246 #define GETXXKEY_R_FUNC         getspnam_r
    247 #define GETXXKEY_R_PARSER       bb__parsespent
    248 #define GETXXKEY_R_ENTTYPE      struct spwd
    249 #define GETXXKEY_R_TEST(ENT)    (!strcmp((ENT)->sp_namp, key))
    250 #define GETXXKEY_R_KEYTYPE      const char *__restrict
    251 #define GETXXKEY_R_PATHNAME     _PATH_SHADOW
    252 #include "pwd_grp_internal.c"
    253 #endif
    254 
    255 #define GETXXKEY_R_FUNC         getpwuid_r
    256 #define GETXXKEY_R_PARSER       bb__parsepwent
    257 #define GETXXKEY_R_ENTTYPE      struct passwd
    258 #define GETXXKEY_R_TEST(ENT)    ((ENT)->pw_uid == key)
    259 #define GETXXKEY_R_KEYTYPE      uid_t
    260 #define GETXXKEY_R_PATHNAME     _PATH_PASSWD
    261 #include "pwd_grp_internal.c"
    262 
    263 #define GETXXKEY_R_FUNC         getgrgid_r
    264 #define GETXXKEY_R_PARSER       bb__parsegrent
    265 #define GETXXKEY_R_ENTTYPE      struct group
    266 #define GETXXKEY_R_TEST(ENT)    ((ENT)->gr_gid == key)
    267 #define GETXXKEY_R_KEYTYPE      gid_t
    268 #define GETXXKEY_R_PATHNAME     _PATH_GROUP
    269 #include "pwd_grp_internal.c"
    270 
    271 /**********************************************************************/
    272 /* TODO: audit & stop using these in bbox, they pull in static buffers */
    273 
    274 /* This one has many users */
    275 struct passwd *getpwuid(uid_t uid)
    276 {
    277     struct statics *S;
    278     struct passwd *resultbuf = RESULTBUF(getpw);
    279     char *buffer = BUFFER(getpw);
    280     struct passwd *result;
    281 
    282     getpwuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getpw)), &result);
    283     return result;
    284 }
    285 
    286 /* This one has many users */
    287 struct group *getgrgid(gid_t gid)
    288 {
    289     struct statics *S;
    290     struct group *resultbuf = RESULTBUF(getgr);
    291     char *buffer = BUFFER(getgr);
    292     struct group *result;
    293 
    294     getgrgid_r(gid, resultbuf, buffer, sizeof(BUFFER(getgr)), &result);
    295     return result;
    296 }
    297 
    298 #if 0 //ENABLE_USE_BB_SHADOW
    299 /* This function is non-standard and is currently not built.  It seems
    300  * to have been created as a reentrant version of the non-standard
    301  * functions getspuid.  Why getspuid was added, I do not know. */
    302 int getspuid_r(uid_t uid, struct spwd *__restrict resultbuf,
    303             char *__restrict buffer, size_t buflen,
    304             struct spwd **__restrict result)
    305 {
    306     int rv;
    307     struct passwd *pp;
    308     struct passwd password;
    309     char pwd_buff[PWD_BUFFER_SIZE];
    310 
    311     *result = NULL;
    312     rv = getpwuid_r(uid, &password, pwd_buff, sizeof(pwd_buff), &pp);
    313     if (!rv) {
    314         rv = getspnam_r(password.pw_name, resultbuf, buffer, buflen, result);
    315     }
    316 
    317     return rv;
    318 }
    319 
    320 /* This function is non-standard and is currently not built.
    321  * Why it was added, I do not know. */
    322 struct spwd *getspuid(uid_t uid)
    323 {
    324     struct statics *S;
    325     struct spwd *resultbuf = RESULTBUF(getsp);
    326     char *buffer = BUFFER(getsp);
    327     struct spwd *result;
    328 
    329     getspuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getsp)), &result);
    330     return result;
    331 }
    332 #endif
    333 
    334 /* This one has many users */
    335 struct passwd *getpwnam(const char *name)
    336 {
    337     struct statics *S;
    338     struct passwd *resultbuf = RESULTBUF(getpw);
    339     char *buffer = BUFFER(getpw);
    340     struct passwd *result;
    341 
    342     getpwnam_r(name, resultbuf, buffer, sizeof(BUFFER(getpw)), &result);
    343     return result;
    344 }
    345 
    346 /* This one has many users */
    347 struct group *getgrnam(const char *name)
    348 {
    349     struct statics *S;
    350     struct group *resultbuf = RESULTBUF(getgr);
    351     char *buffer = BUFFER(getgr);
    352     struct group *result;
    353 
    354     getgrnam_r(name, resultbuf, buffer, sizeof(BUFFER(getgr)), &result);
    355     return result;
    356 }
    357 
    358 #if 0 //ENABLE_USE_BB_SHADOW
    359 struct spwd *getspnam(const char *name)
    360 {
    361     struct statics *S;
    362     struct spwd *resultbuf = RESULTBUF(getsp);
    363     char *buffer = BUFFER(getsp);
    364     struct spwd *result;
    365 
    366     getspnam_r(name, resultbuf, buffer, sizeof(BUFFER(getsp)), &result);
    367     return result;
    368 }
    369 #endif
    370 
    371 /**********************************************************************/
    372 
    373 /* FIXME: we don't have such CONFIG_xx - ?! */
    374 
    375 #if defined CONFIG_USE_BB_THREADSAFE_SHADOW && defined PTHREAD_MUTEX_INITIALIZER
    376 static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
    377 # define LOCK       pthread_mutex_lock(&mylock)
    378 # define UNLOCK     pthread_mutex_unlock(&mylock);
    379 #else
    380 # define LOCK       ((void) 0)
    381 # define UNLOCK     ((void) 0)
    382 #endif
    383 
    384 static FILE *pwf /*= NULL*/;
    385 void setpwent(void)
    386 {
    387     LOCK;
    388     if (pwf) {
    389         rewind(pwf);
    390     }
    391     UNLOCK;
    392 }
    393 
    394 void endpwent(void)
    395 {
    396     LOCK;
    397     if (pwf) {
    398         fclose(pwf);
    399         pwf = NULL;
    400     }
    401     UNLOCK;
    402 }
    403 
    404 
    405 int getpwent_r(struct passwd *__restrict resultbuf,
    406             char *__restrict buffer, size_t buflen,
    407             struct passwd **__restrict result)
    408 {
    409     int rv;
    410 
    411     LOCK;
    412     *result = NULL;             /* In case of error... */
    413 
    414     if (!pwf) {
    415         pwf = fopen_for_read(_PATH_PASSWD);
    416         if (!pwf) {
    417             rv = errno;
    418             goto ERR;
    419         }
    420         close_on_exec_on(fileno(pwf));
    421     }
    422 
    423     rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, pwf);
    424     if (!rv) {
    425         *result = resultbuf;
    426     }
    427 
    428  ERR:
    429     UNLOCK;
    430     return rv;
    431 }
    432 
    433 static FILE *grf /*= NULL*/;
    434 void setgrent(void)
    435 {
    436     LOCK;
    437     if (grf) {
    438         rewind(grf);
    439     }
    440     UNLOCK;
    441 }
    442 
    443 void endgrent(void)
    444 {
    445     LOCK;
    446     if (grf) {
    447         fclose(grf);
    448         grf = NULL;
    449     }
    450     UNLOCK;
    451 }
    452 
    453 int getgrent_r(struct group *__restrict resultbuf,
    454             char *__restrict buffer, size_t buflen,
    455             struct group **__restrict result)
    456 {
    457     int rv;
    458 
    459     LOCK;
    460     *result = NULL;             /* In case of error... */
    461 
    462     if (!grf) {
    463         grf = fopen_for_read(_PATH_GROUP);
    464         if (!grf) {
    465             rv = errno;
    466             goto ERR;
    467         }
    468         close_on_exec_on(fileno(grf));
    469     }
    470 
    471     rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, grf);
    472     if (!rv) {
    473         *result = resultbuf;
    474     }
    475 
    476  ERR:
    477     UNLOCK;
    478     return rv;
    479 }
    480 
    481 #ifdef UNUSED_FOR_NOW
    482 #if ENABLE_USE_BB_SHADOW
    483 static FILE *spf /*= NULL*/;
    484 void setspent(void)
    485 {
    486     LOCK;
    487     if (spf) {
    488         rewind(spf);
    489     }
    490     UNLOCK;
    491 }
    492 
    493 void endspent(void)
    494 {
    495     LOCK;
    496     if (spf) {
    497         fclose(spf);
    498         spf = NULL;
    499     }
    500     UNLOCK;
    501 }
    502 
    503 int getspent_r(struct spwd *resultbuf, char *buffer,
    504             size_t buflen, struct spwd **result)
    505 {
    506     int rv;
    507 
    508     LOCK;
    509     *result = NULL;             /* In case of error... */
    510 
    511     if (!spf) {
    512         spf = fopen_for_read(_PATH_SHADOW);
    513         if (!spf) {
    514             rv = errno;
    515             goto ERR;
    516         }
    517         close_on_exec_on(fileno(spf));
    518     }
    519 
    520     rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, spf);
    521     if (!rv) {
    522         *result = resultbuf;
    523     }
    524 
    525  ERR:
    526     UNLOCK;
    527     return rv;
    528 }
    529 #endif
    530 #endif /* UNUSED_FOR_NOW */
    531 
    532 #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
    533 struct passwd *getpwent(void)
    534 {
    535     static char line_buff[PWD_BUFFER_SIZE];
    536     static struct passwd pwd;
    537     struct passwd *result;
    538 
    539     getpwent_r(&pwd, line_buff, sizeof(line_buff), &result);
    540     return result;
    541 }
    542 
    543 struct group *getgrent(void)
    544 {
    545     static char line_buff[GRP_BUFFER_SIZE];
    546     static struct group gr;
    547     struct group *result;
    548 
    549     getgrent_r(&gr, line_buff, sizeof(line_buff), &result);
    550     return result;
    551 }
    552 
    553 #if ENABLE_USE_BB_SHADOW
    554 struct spwd *getspent(void)
    555 {
    556     static char line_buff[PWD_BUFFER_SIZE];
    557     static struct spwd spwd;
    558     struct spwd *result;
    559 
    560     getspent_r(&spwd, line_buff, sizeof(line_buff), &result);
    561     return result;
    562 }
    563 
    564 struct spwd *sgetspent(const char *string)
    565 {
    566     static char line_buff[PWD_BUFFER_SIZE];
    567     static struct spwd spwd;
    568     struct spwd *result;
    569 
    570     sgetspent_r(string, &spwd, line_buff, sizeof(line_buff), &result);
    571     return result;
    572 }
    573 #endif
    574 #endif /* UNUSED_SINCE_WE_AVOID_STATIC_BUFS */
    575 
    576 static gid_t *getgrouplist_internal(int *ngroups_ptr, const char *user, gid_t gid)
    577 {
    578     FILE *grfile;
     382int FAST_FUNC getspnam_r(const char *name, struct spwd *struct_buf, char *buffer, size_t buflen,
     383        struct spwd **result)
     384{
     385    *result = struct_buf;
     386    return getXXnam_r(name, (2 << 2) + 0, buffer, buflen, result);
     387}
     388#endif
     389
     390#ifdef UNUSED
     391/****** getXXent_r */
     392
     393static int FAST_FUNC getXXent_r(uintptr_t db_idx, char *buffer, size_t buflen,
     394        void *result)
     395{
     396    char *buf;
     397    struct passdb *db = &get_S()->db[db_idx];
     398
     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    }
     406
     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);
     411}
     412
     413int FAST_FUNC getpwent_r(struct passwd *struct_buf, char *buffer, size_t buflen,
     414        struct passwd **result)
     415{
     416    *result = struct_buf;
     417    return getXXent_r(0, buffer, buflen, result);
     418}
     419#endif
     420
     421/****** getXXent */
     422
     423static void* FAST_FUNC getXXent(uintptr_t db_idx)
     424{
     425    char *buf;
     426    struct passdb *db = &get_S()->db[db_idx];
     427
     428    if (!db->fp) {
     429        db->fp = fopen_for_read(db->filename);
     430        if (!db->fp) {
     431            return NULL;
     432        }
     433        close_on_exec_on(fileno(db->fp));
     434    }
     435
     436    buf = parse_common(db->fp, db, /*no search key:*/ NULL, -1);
     437    return massage_data_for_non_r_func(db, buf);
     438}
     439
     440struct passwd* FAST_FUNC getpwent(void)
     441{
     442    return getXXent(0);
     443}
     444
     445/****** getXXnam/id */
     446
     447static void* FAST_FUNC getXXnam(const char *name, unsigned db_and_field_pos)
     448{
     449    char *buf;
     450    struct passdb *db = &get_S()->db[db_and_field_pos >> 2];
     451
     452    buf = parse_file(db, name, db_and_field_pos & 3);
     453    return massage_data_for_non_r_func(db, buf);
     454}
     455
     456struct passwd* FAST_FUNC getpwnam(const char *name)
     457{
     458    return getXXnam(name, (0 << 2) + 0);
     459}
     460struct group* FAST_FUNC getgrnam(const char *name)
     461{
     462    return getXXnam(name, (1 << 2) + 0);
     463}
     464struct passwd* FAST_FUNC getpwuid(uid_t id)
     465{
     466    return getXXnam(utoa(id), (0 << 2) + 2);
     467}
     468struct group* FAST_FUNC getgrgid(gid_t id)
     469{
     470    return getXXnam(utoa(id), (1 << 2) + 2);
     471}
     472
     473/****** end/setXXend */
     474
     475void FAST_FUNC endpwent(void)
     476{
     477    if (has_S && S.db[0].fp) {
     478        fclose(S.db[0].fp);
     479        S.db[0].fp = NULL;
     480    }
     481}
     482void FAST_FUNC setpwent(void)
     483{
     484    if (has_S && S.db[0].fp) {
     485        rewind(S.db[0].fp);
     486    }
     487}
     488void FAST_FUNC endgrent(void)
     489{
     490    if (has_S && S.db[1].fp) {
     491        fclose(S.db[1].fp);
     492        S.db[1].fp = NULL;
     493    }
     494}
     495
     496/****** initgroups and getgrouplist */
     497
     498static gid_t* FAST_FUNC getgrouplist_internal(int *ngroups_ptr,
     499        const char *user, gid_t gid)
     500{
     501    FILE *fp;
    579502    gid_t *group_list;
    580503    int ngroups;
    581     struct group group;
    582     char buff[PWD_BUFFER_SIZE];
    583504
    584505    /* We alloc space for 8 gids at a time. */
    585     group_list = xmalloc(8 * sizeof(group_list[0]));
     506    group_list = xzalloc(8 * sizeof(group_list[0]));
    586507    group_list[0] = gid;
    587508    ngroups = 1;
    588509
    589     grfile = fopen_for_read(_PATH_GROUP);
    590     if (grfile) {
    591         while (!bb__pgsreader(bb__parsegrent, &group, buff, sizeof(buff), grfile)) {
     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) {
    592515            char **m;
    593             assert(group.gr_mem); /* Must have at least a NULL terminator. */
     516            struct group group;
     517            if (!convert_to_struct(db, buf, &group))
     518                goto next;
    594519            if (group.gr_gid == gid)
    595                 continue;
     520                goto next;
    596521            for (m = group.gr_mem; *m; m++) {
    597522                if (strcmp(*m, user) != 0)
    … …  
    599524                group_list = xrealloc_vector(group_list, /*8=2^3:*/ 3, ngroups);
    600525                group_list[ngroups++] = group.gr_gid;
    601                 break;
     526                goto next;
    602527            }
    603         }
    604         fclose(grfile);
     528 next:
     529            free(buf);
     530        }
     531        fclose(fp);
    605532    }
    606533    *ngroups_ptr = ngroups;
    … …  
    608535}
    609536
    610 int initgroups(const char *user, gid_t gid)
     537int FAST_FUNC initgroups(const char *user, gid_t gid)
    611538{
    612539    int ngroups;
    … …  
    618545}
    619546
    620 int getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups)
     547int FAST_FUNC getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups)
    621548{
    622549    int ngroups_old = *ngroups;
    … …  
    632559    return ngroups_old;
    633560}
    634 
    635 #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
    636 int putpwent(const struct passwd *__restrict p, FILE *__restrict f)
    637 {
    638     int rv = -1;
    639 
    640 #if 0
    641     /* glibc does this check */
    642     if (!p || !f) {
    643         errno = EINVAL;
    644         return rv;
    645     }
    646 #endif
    647 
    648     /* No extra thread locking is needed above what fprintf does. */
    649     if (fprintf(f, "%s:%s:%lu:%lu:%s:%s:%s\n",
    650                 p->pw_name, p->pw_passwd,
    651                 (unsigned long)(p->pw_uid),
    652                 (unsigned long)(p->pw_gid),
    653                 p->pw_gecos, p->pw_dir, p->pw_shell) >= 0
    654         ) {
    655         rv = 0;
    656     }
    657 
    658     return rv;
    659 }
    660 
    661 int putgrent(const struct group *__restrict p, FILE *__restrict f)
    662 {
    663     int rv = -1;
    664 
    665 #if 0
    666     /* glibc does this check */
    667     if (!p || !f) {
    668         errno = EINVAL;
    669         return rv;
    670     }
    671 #endif
    672 
    673     if (fprintf(f, "%s:%s:%lu:",
    674                 p->gr_name, p->gr_passwd,
    675                 (unsigned long)(p->gr_gid)) >= 0
    676     ) {
    677         static const char format[] ALIGN1 = ",%s";
    678 
    679         char **m;
    680         const char *fmt;
    681 
    682         fmt = format + 1;
    683 
    684         assert(p->gr_mem);
    685         m = p->gr_mem;
    686 
    687         while (1) {
    688             if (!*m) {
    689                 if (fputc('\n', f) >= 0) {
    690                     rv = 0;
    691                 }
    692                 break;
    693             }
    694             if (fprintf(f, fmt, *m) < 0) {
    695                 break;
    696             }
    697             m++;
    698             fmt = format;
    699         }
    700     }
    701 
    702     return rv;
    703 }
    704 #endif
    705 
    706 #if ENABLE_USE_BB_SHADOW
    707 #ifdef UNUSED_FOR_NOW
    708 static const unsigned char put_sp_off[] ALIGN1 = {
    709     offsetof(struct spwd, sp_lstchg),       /* 2 - not a char ptr */
    710     offsetof(struct spwd, sp_min),          /* 3 - not a char ptr */
    711     offsetof(struct spwd, sp_max),          /* 4 - not a char ptr */
    712     offsetof(struct spwd, sp_warn),         /* 5 - not a char ptr */
    713     offsetof(struct spwd, sp_inact),        /* 6 - not a char ptr */
    714     offsetof(struct spwd, sp_expire)        /* 7 - not a char ptr */
    715 };
    716 
    717 int putspent(const struct spwd *p, FILE *stream)
    718 {
    719     const char *fmt;
    720     long x;
    721     int i;
    722     int rv = -1;
    723 
    724     /* Unlike putpwent and putgrent, glibc does not check the args. */
    725     if (fprintf(stream, "%s:%s:", p->sp_namp,
    726                 (p->sp_pwdp ? p->sp_pwdp : "")) < 0
    727     ) {
    728         goto DO_UNLOCK;
    729     }
    730 
    731     for (i = 0; i < sizeof(put_sp_off); i++) {
    732         fmt = "%ld:";
    733         x = *(long *)((char *)p + put_sp_off[i]);
    734         if (x == -1) {
    735             fmt += 3;
    736         }
    737         if (fprintf(stream, fmt, x) < 0) {
    738             goto DO_UNLOCK;
    739         }
    740     }
    741 
    742     if ((p->sp_flag != ~0UL) && (fprintf(stream, "%lu", p->sp_flag) < 0)) {
    743         goto DO_UNLOCK;
    744     }
    745 
    746     if (fputc('\n', stream) > 0) {
    747         rv = 0;
    748     }
    749 
    750  DO_UNLOCK:
    751     return rv;
    752 }
    753 #endif
    754 #endif /* USE_BB_SHADOW */
    755 
    756 /**********************************************************************/
    757 /* Internal functions                                                 */
    758 /**********************************************************************/
    759 
    760 static const unsigned char pw_off[] ALIGN1 = {
    761     offsetof(struct passwd, pw_name),       /* 0 */
    762     offsetof(struct passwd, pw_passwd),     /* 1 */
    763     offsetof(struct passwd, pw_uid),        /* 2 - not a char ptr */
    764     offsetof(struct passwd, pw_gid),        /* 3 - not a char ptr */
    765     offsetof(struct passwd, pw_gecos),      /* 4 */
    766     offsetof(struct passwd, pw_dir),        /* 5 */
    767     offsetof(struct passwd, pw_shell)       /* 6 */
    768 };
    769 
    770 static int FAST_FUNC bb__parsepwent(void *data, char *line)
    771 {
    772     char *endptr;
    773     char *p;
    774     int i;
    775 
    776     i = 0;
    777     while (1) {
    778         p = (char *) data + pw_off[i];
    779 
    780         if (i < 2 || i > 3) {
    781             *((char **) p) = line;
    782             if (i == 6) {
    783                 return 0;
    784             }
    785             /* NOTE: glibc difference - glibc allows omission of
    786              * ':' seperators after the gid field if all remaining
    787              * entries are empty.  We require all separators. */
    788             line = strchr(line, ':');
    789             if (!line) {
    790                 break;
    791             }
    792         } else {
    793             unsigned long t = strtoul(line, &endptr, 10);
    794             /* Make sure we had at least one digit, and that the
    795              * failing char is the next field seperator ':'.  See
    796              * glibc difference note above. */
    797             /* TODO: Also check for leading whitespace? */
    798             if ((endptr == line) || (*endptr != ':')) {
    799                 break;
    800             }
    801             line = endptr;
    802             if (i & 1) {        /* i == 3 -- gid */
    803                 *((gid_t *) p) = t;
    804             } else {            /* i == 2 -- uid */
    805                 *((uid_t *) p) = t;
    806             }
    807         }
    808 
    809         *line++ = '\0';
    810         i++;
    811     } /* while (1) */
    812 
    813     return -1;
    814 }
    815 
    816 /**********************************************************************/
    817 
    818 static const unsigned char gr_off[] ALIGN1 = {
    819     offsetof(struct group, gr_name),        /* 0 */
    820     offsetof(struct group, gr_passwd),      /* 1 */
    821     offsetof(struct group, gr_gid)          /* 2 - not a char ptr */
    822 };
    823 
    824 static int FAST_FUNC bb__parsegrent(void *data, char *line)
    825 {
    826     char *endptr;
    827     char *p;
    828     int i;
    829     char **members;
    830     char *end_of_buf;
    831 
    832     end_of_buf = ((struct group *) data)->gr_name; /* Evil hack! */
    833     i = 0;
    834     while (1) {
    835         p = (char *) data + gr_off[i];
    836 
    837         if (i < 2) {
    838             *((char **) p) = line;
    839             line = strchr(line, ':');
    840             if (!line) {
    841                 break;
    842             }
    843             *line++ = '\0';
    844             i++;
    845         } else {
    846             *((gid_t *) p) = strtoul(line, &endptr, 10);
    847 
    848             /* NOTE: glibc difference - glibc allows omission of the
    849              * trailing colon when there is no member list.  We treat
    850              * this as an error. */
    851 
    852             /* Make sure we had at least one digit, and that the
    853              * failing char is the next field seperator ':'.  See
    854              * glibc difference note above. */
    855             if ((endptr == line) || (*endptr != ':')) {
    856                 break;
    857             }
    858 
    859             i = 1;              /* Count terminating NULL ptr. */
    860             p = endptr;
    861 
    862             if (p[1]) { /* We have a member list to process. */
    863                 /* Overwrite the last ':' with a ',' before counting.
    864                  * This allows us to (1) test for initial ','
    865                  * and (2) adds one ',' so that the number of commas
    866                  * equals the member count. */
    867                 *p = ',';
    868                 do {
    869                     /* NOTE: glibc difference - glibc allows and trims leading
    870                      * (but not trailing) space.  We treat this as an error. */
    871                     /* NOTE: glibc difference - glibc allows consecutive and
    872                      * trailing commas, and ignores "empty string" users.  We
    873                      * treat this as an error. */
    874                     if (*p == ',') {
    875                         ++i;
    876                         *p = 0; /* nul-terminate each member string. */
    877                         if (!*++p || (*p == ',') || isspace(*p)) {
    878                             goto ERR;
    879                         }
    880                     }
    881                 } while (*++p);
    882             }
    883 
    884             /* Now align (p+1), rounding up. */
    885             /* Assumes sizeof(char **) is a power of 2. */
    886             members = (char **)( (((intptr_t) p) + sizeof(char **))
    887                                  & ~((intptr_t)(sizeof(char **) - 1)) );
    888 
    889             if (((char *)(members + i)) > end_of_buf) { /* No space. */
    890                 break;
    891             }
    892 
    893             ((struct group *) data)->gr_mem = members;
    894 
    895             if (--i) {
    896                 p = endptr; /* Pointing to char prior to first member. */
    897                 while (1) {
    898                     *members++ = ++p;
    899                     if (!--i)
    900                         break;
    901                     while (*++p)
    902                         continue;
    903                 }
    904             }
    905             *members = NULL;
    906 
    907             return 0;
    908         }
    909     } /* while (1) */
    910 
    911  ERR:
    912     return -1;
    913 }
    914 
    915 /**********************************************************************/
    916 
    917 #if ENABLE_USE_BB_SHADOW
    918 static const unsigned char sp_off[] ALIGN1 = {
    919     offsetof(struct spwd, sp_namp),         /* 0: char* */
    920     offsetof(struct spwd, sp_pwdp),         /* 1: char* */
    921     offsetof(struct spwd, sp_lstchg),       /* 2: long */
    922     offsetof(struct spwd, sp_min),          /* 3: long */
    923     offsetof(struct spwd, sp_max),          /* 4: long */
    924     offsetof(struct spwd, sp_warn),         /* 5: long */
    925     offsetof(struct spwd, sp_inact),        /* 6: long */
    926     offsetof(struct spwd, sp_expire),       /* 7: long */
    927     offsetof(struct spwd, sp_flag)          /* 8: unsigned long */
    928 };
    929 
    930 static int FAST_FUNC bb__parsespent(void *data, char *line)
    931 {
    932     char *endptr;
    933     char *p;
    934     int i;
    935 
    936     i = 0;
    937     while (1) {
    938         p = (char *) data + sp_off[i];
    939         if (i < 2) {
    940             *((char **) p) = line;
    941             line = strchr(line, ':');
    942             if (!line) {
    943                 break; /* error */
    944             }
    945         } else {
    946             *((long *) p) = strtoul(line, &endptr, 10);
    947             if (endptr == line) {
    948                 *((long *) p) = -1L;
    949             }
    950             line = endptr;
    951             if (i == 8) {
    952                 if (*line != '\0') {
    953                     break; /* error */
    954                 }
    955                 return 0; /* all ok */
    956             }
    957             if (*line != ':') {
    958                 break; /* error */
    959             }
    960         }
    961         *line++ = '\0';
    962         i++;
    963     }
    964 
    965     return EINVAL;
    966 }
    967 #endif
    968 
    969 /**********************************************************************/
    970 
    971 /* Reads until EOF, or until it finds a line which fits in the buffer
    972  * and for which the parser function succeeds.
    973  *
    974  * Returns 0 on success and ENOENT for end-of-file (glibc convention).
    975  */
    976 static int bb__pgsreader(
    977         int FAST_FUNC (*parserfunc)(void *d, char *line),
    978         void *data,
    979         char *__restrict line_buff,
    980         size_t buflen,
    981         FILE *f)
    982 {
    983     int skip;
    984     int rv = ERANGE;
    985 
    986     if (buflen < PWD_BUFFER_SIZE) {
    987         errno = rv;
    988         return rv;
    989     }
    990 
    991     skip = 0;
    992     while (1) {
    993         if (!fgets(line_buff, buflen, f)) {
    994             if (feof(f)) {
    995                 rv = ENOENT;
    996             }
    997             break;
    998         }
    999 
    1000         {
    1001             int line_len = strlen(line_buff) - 1;
    1002             if (line_len >= 0 && line_buff[line_len] == '\n') {
    1003                 line_buff[line_len] = '\0';
    1004             } else
    1005             if (line_len + 2 == buflen) {
    1006                 /* A start (or continuation) of overlong line */
    1007                 skip = 1;
    1008                 continue;
    1009             } /* else: a last line in the file, and it has no '\n' */
    1010         }
    1011 
    1012         if (skip) {
    1013             /* This "line" is a remainder of overlong line, ignore */
    1014             skip = 0;
    1015             continue;
    1016         }
    1017 
    1018         /* NOTE: glibc difference - glibc strips leading whitespace from
    1019          * records.  We do not allow leading whitespace. */
    1020 
    1021         /* Skip empty lines, comment lines, and lines with leading
    1022          * whitespace. */
    1023         if (line_buff[0] != '\0' && line_buff[0] != '#' && !isspace(line_buff[0])) {
    1024             if (parserfunc == bb__parsegrent) {
    1025                 /* Do evil group hack:
    1026                  * The group entry parsing function needs to know where
    1027                  * the end of the buffer is so that it can construct the
    1028                  * group member ptr table. */
    1029                 ((struct group *) data)->gr_name = line_buff + buflen;
    1030             }
    1031             if (parserfunc(data, line_buff) == 0) {
    1032                 rv = 0;
    1033                 break;
    1034             }
    1035         }
    1036     } /* while (1) */
    1037 
    1038     return rv;
    1039 }
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