busybox/libpwdgrp/pwd_grp.c
Denys Vlasenko acdb0041b3 libpwdgrp/pwd_grp.c: use same static buffer for all getpwXX functions
This should save more than 0.5k of malloced memory in applets
which use those functions.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2012-01-06 16:24:56 +01:00

1040 lines
24 KiB
C

/* vi: set sw=4 ts=4: */
/* Copyright (C) 2003 Manuel Novoa III
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* Nov 6, 2003 Initial version.
*
* NOTE: This implementation is quite strict about requiring all
* field seperators. It also does not allow leading whitespace
* except when processing the numeric fields. glibc is more
* lenient. See the various glibc difference comments below.
*
* TODO:
* Move to dynamic allocation of (currently statically allocated)
* buffers; especially for the group-related functions since
* large group member lists will cause error returns.
*/
#include "libbb.h"
#include <assert.h>
/**********************************************************************/
/* Sizes for statically allocated buffers. */
#define PWD_BUFFER_SIZE 256
#define GRP_BUFFER_SIZE 256
/**********************************************************************/
/* Prototypes for internal functions. */
static int bb__pgsreader(
int FAST_FUNC (*parserfunc)(void *d, char *line),
void *data,
char *__restrict line_buff,
size_t buflen,
FILE *f);
static int FAST_FUNC bb__parsepwent(void *pw, char *line);
static int FAST_FUNC bb__parsegrent(void *gr, char *line);
#if ENABLE_USE_BB_SHADOW
static int FAST_FUNC bb__parsespent(void *sp, char *line);
#endif
/**********************************************************************/
/* We avoid having big global data. */
struct statics {
/* Smaller things first */
/* It's ok to use one buffer for getpwuid and getpwnam. Manpage says:
* "The return value may point to a static area, and may be overwritten
* by subsequent calls to getpwent(), getpwnam(), or getpwuid()."
*/
struct passwd getpw_resultbuf;
struct group getgr_resultbuf;
char getpw_buffer[PWD_BUFFER_SIZE];
char getgr_buffer[GRP_BUFFER_SIZE];
#if 0 //ENABLE_USE_BB_SHADOW
struct spwd getsp_resultbuf;
char getsp_buffer[PWD_BUFFER_SIZE];
#endif
// Not converted - too small to bother
//pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
//FILE *pwf /*= NULL*/;
//FILE *grf /*= NULL*/;
//FILE *spf /*= NULL*/;
};
static struct statics *ptr_to_statics;
static struct statics *get_S(void)
{
if (!ptr_to_statics)
ptr_to_statics = xzalloc(sizeof(*ptr_to_statics));
return ptr_to_statics;
}
/* Always use in this order, get_S() must be called first */
#define RESULTBUF(name) &((S = get_S())->name##_resultbuf)
#define BUFFER(name) (S->name##_buffer)
/**********************************************************************/
/* For the various fget??ent_r funcs, return
*
* 0: success
* ENOENT: end-of-file encountered
* ERANGE: buflen too small
* other error values possible. See bb__pgsreader.
*
* Also, *result == resultbuf on success and NULL on failure.
*
* NOTE: glibc difference - For the ENOENT case, glibc also sets errno.
* We do not, as it really isn't an error if we reach the end-of-file.
* Doing so is analogous to having fgetc() set errno on EOF.
*/
/**********************************************************************/
int fgetpwent_r(FILE *__restrict stream, struct passwd *__restrict resultbuf,
char *__restrict buffer, size_t buflen,
struct passwd **__restrict result)
{
int rv;
*result = NULL;
rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, stream);
if (!rv) {
*result = resultbuf;
}
return rv;
}
int fgetgrent_r(FILE *__restrict stream, struct group *__restrict resultbuf,
char *__restrict buffer, size_t buflen,
struct group **__restrict result)
{
int rv;
*result = NULL;
rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, stream);
if (!rv) {
*result = resultbuf;
}
return rv;
}
#if ENABLE_USE_BB_SHADOW
#ifdef UNUSED_FOR_NOW
int fgetspent_r(FILE *__restrict stream, struct spwd *__restrict resultbuf,
char *__restrict buffer, size_t buflen,
struct spwd **__restrict result)
{
int rv;
*result = NULL;
rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, stream);
if (!rv) {
*result = resultbuf;
}
return rv;
}
#endif
#endif
/**********************************************************************/
/* For the various fget??ent funcs, return NULL on failure and a
* pointer to the appropriate struct (statically allocated) on success.
* TODO: audit & stop using these in bbox, they pull in static buffers */
/**********************************************************************/
#ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
struct passwd *fgetpwent(FILE *stream)
{
struct statics *S;
struct passwd *resultbuf = RESULTBUF(getpw);
char *buffer = BUFFER(getpw);
struct passwd *result;
fgetpwent_r(stream, resultbuf, buffer, sizeof(BUFFER(getpw)), &result);
return result;
}
struct group *fgetgrent(FILE *stream)
{
struct statics *S;
struct group *resultbuf = RESULTBUF(getgr);
char *buffer = BUFFER(getgr);
struct group *result;
fgetgrent_r(stream, resultbuf, buffer, sizeof(BUFFER(getgr)), &result);
return result;
}
#endif
#if ENABLE_USE_BB_SHADOW
#ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
struct spwd *fgetspent(FILE *stream)
{
struct statics *S;
struct spwd *resultbuf = RESULTBUF(getsp);
char *buffer = BUFFER(getsp);
struct spwd *result;
fgetspent_r(stream, resultbuf, buffer, sizeof(BUFFER(getsp)), &result);
return result;
}
#endif
#ifdef UNUSED_FOR_NOW
int sgetspent_r(const char *string, struct spwd *result_buf,
char *buffer, size_t buflen, struct spwd **result)
{
int rv = ERANGE;
*result = NULL;
if (buflen < PWD_BUFFER_SIZE) {
DO_ERANGE:
errno = rv;
goto DONE;
}
if (string != buffer) {
if (strlen(string) >= buflen) {
goto DO_ERANGE;
}
strcpy(buffer, string);
}
rv = bb__parsespent(result_buf, buffer);
if (!rv) {
*result = result_buf;
}
DONE:
return rv;
}
#endif
#endif /* ENABLE_USE_BB_SHADOW */
/**********************************************************************/
#define GETXXKEY_R_FUNC getpwnam_r
#define GETXXKEY_R_PARSER bb__parsepwent
#define GETXXKEY_R_ENTTYPE struct passwd
#define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->pw_name, key))
#define GETXXKEY_R_KEYTYPE const char *__restrict
#define GETXXKEY_R_PATHNAME _PATH_PASSWD
#include "pwd_grp_internal.c"
#define GETXXKEY_R_FUNC getgrnam_r
#define GETXXKEY_R_PARSER bb__parsegrent
#define GETXXKEY_R_ENTTYPE struct group
#define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->gr_name, key))
#define GETXXKEY_R_KEYTYPE const char *__restrict
#define GETXXKEY_R_PATHNAME _PATH_GROUP
#include "pwd_grp_internal.c"
#if ENABLE_USE_BB_SHADOW
#define GETXXKEY_R_FUNC getspnam_r
#define GETXXKEY_R_PARSER bb__parsespent
#define GETXXKEY_R_ENTTYPE struct spwd
#define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->sp_namp, key))
#define GETXXKEY_R_KEYTYPE const char *__restrict
#define GETXXKEY_R_PATHNAME _PATH_SHADOW
#include "pwd_grp_internal.c"
#endif
#define GETXXKEY_R_FUNC getpwuid_r
#define GETXXKEY_R_PARSER bb__parsepwent
#define GETXXKEY_R_ENTTYPE struct passwd
#define GETXXKEY_R_TEST(ENT) ((ENT)->pw_uid == key)
#define GETXXKEY_R_KEYTYPE uid_t
#define GETXXKEY_R_PATHNAME _PATH_PASSWD
#include "pwd_grp_internal.c"
#define GETXXKEY_R_FUNC getgrgid_r
#define GETXXKEY_R_PARSER bb__parsegrent
#define GETXXKEY_R_ENTTYPE struct group
#define GETXXKEY_R_TEST(ENT) ((ENT)->gr_gid == key)
#define GETXXKEY_R_KEYTYPE gid_t
#define GETXXKEY_R_PATHNAME _PATH_GROUP
#include "pwd_grp_internal.c"
/**********************************************************************/
/* TODO: audit & stop using these in bbox, they pull in static buffers */
/* This one has many users */
struct passwd *getpwuid(uid_t uid)
{
struct statics *S;
struct passwd *resultbuf = RESULTBUF(getpw);
char *buffer = BUFFER(getpw);
struct passwd *result;
getpwuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getpw)), &result);
return result;
}
/* This one has many users */
struct group *getgrgid(gid_t gid)
{
struct statics *S;
struct group *resultbuf = RESULTBUF(getgr);
char *buffer = BUFFER(getgr);
struct group *result;
getgrgid_r(gid, resultbuf, buffer, sizeof(BUFFER(getgr)), &result);
return result;
}
#if 0 //ENABLE_USE_BB_SHADOW
/* This function is non-standard and is currently not built. It seems
* to have been created as a reentrant version of the non-standard
* functions getspuid. Why getspuid was added, I do not know. */
int getspuid_r(uid_t uid, struct spwd *__restrict resultbuf,
char *__restrict buffer, size_t buflen,
struct spwd **__restrict result)
{
int rv;
struct passwd *pp;
struct passwd password;
char pwd_buff[PWD_BUFFER_SIZE];
*result = NULL;
rv = getpwuid_r(uid, &password, pwd_buff, sizeof(pwd_buff), &pp);
if (!rv) {
rv = getspnam_r(password.pw_name, resultbuf, buffer, buflen, result);
}
return rv;
}
/* This function is non-standard and is currently not built.
* Why it was added, I do not know. */
struct spwd *getspuid(uid_t uid)
{
struct statics *S;
struct spwd *resultbuf = RESULTBUF(getsp);
char *buffer = BUFFER(getsp);
struct spwd *result;
getspuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getsp)), &result);
return result;
}
#endif
/* This one has many users */
struct passwd *getpwnam(const char *name)
{
struct statics *S;
struct passwd *resultbuf = RESULTBUF(getpw);
char *buffer = BUFFER(getpw);
struct passwd *result;
getpwnam_r(name, resultbuf, buffer, sizeof(BUFFER(getpw)), &result);
return result;
}
/* This one has many users */
struct group *getgrnam(const char *name)
{
struct statics *S;
struct group *resultbuf = RESULTBUF(getgr);
char *buffer = BUFFER(getgr);
struct group *result;
getgrnam_r(name, resultbuf, buffer, sizeof(BUFFER(getgr)), &result);
return result;
}
#if 0 //ENABLE_USE_BB_SHADOW
struct spwd *getspnam(const char *name)
{
struct statics *S;
struct spwd *resultbuf = RESULTBUF(getsp);
char *buffer = BUFFER(getsp);
struct spwd *result;
getspnam_r(name, resultbuf, buffer, sizeof(BUFFER(getsp)), &result);
return result;
}
#endif
/**********************************************************************/
/* FIXME: we don't have such CONFIG_xx - ?! */
#if defined CONFIG_USE_BB_THREADSAFE_SHADOW && defined PTHREAD_MUTEX_INITIALIZER
static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
# define LOCK pthread_mutex_lock(&mylock)
# define UNLOCK pthread_mutex_unlock(&mylock);
#else
# define LOCK ((void) 0)
# define UNLOCK ((void) 0)
#endif
static FILE *pwf /*= NULL*/;
void setpwent(void)
{
LOCK;
if (pwf) {
rewind(pwf);
}
UNLOCK;
}
void endpwent(void)
{
LOCK;
if (pwf) {
fclose(pwf);
pwf = NULL;
}
UNLOCK;
}
int getpwent_r(struct passwd *__restrict resultbuf,
char *__restrict buffer, size_t buflen,
struct passwd **__restrict result)
{
int rv;
LOCK;
*result = NULL; /* In case of error... */
if (!pwf) {
pwf = fopen_for_read(_PATH_PASSWD);
if (!pwf) {
rv = errno;
goto ERR;
}
close_on_exec_on(fileno(pwf));
}
rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, pwf);
if (!rv) {
*result = resultbuf;
}
ERR:
UNLOCK;
return rv;
}
static FILE *grf /*= NULL*/;
void setgrent(void)
{
LOCK;
if (grf) {
rewind(grf);
}
UNLOCK;
}
void endgrent(void)
{
LOCK;
if (grf) {
fclose(grf);
grf = NULL;
}
UNLOCK;
}
int getgrent_r(struct group *__restrict resultbuf,
char *__restrict buffer, size_t buflen,
struct group **__restrict result)
{
int rv;
LOCK;
*result = NULL; /* In case of error... */
if (!grf) {
grf = fopen_for_read(_PATH_GROUP);
if (!grf) {
rv = errno;
goto ERR;
}
close_on_exec_on(fileno(grf));
}
rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, grf);
if (!rv) {
*result = resultbuf;
}
ERR:
UNLOCK;
return rv;
}
#ifdef UNUSED_FOR_NOW
#if ENABLE_USE_BB_SHADOW
static FILE *spf /*= NULL*/;
void setspent(void)
{
LOCK;
if (spf) {
rewind(spf);
}
UNLOCK;
}
void endspent(void)
{
LOCK;
if (spf) {
fclose(spf);
spf = NULL;
}
UNLOCK;
}
int getspent_r(struct spwd *resultbuf, char *buffer,
size_t buflen, struct spwd **result)
{
int rv;
LOCK;
*result = NULL; /* In case of error... */
if (!spf) {
spf = fopen_for_read(_PATH_SHADOW);
if (!spf) {
rv = errno;
goto ERR;
}
close_on_exec_on(fileno(spf));
}
rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, spf);
if (!rv) {
*result = resultbuf;
}
ERR:
UNLOCK;
return rv;
}
#endif
#endif /* UNUSED_FOR_NOW */
#ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
struct passwd *getpwent(void)
{
static char line_buff[PWD_BUFFER_SIZE];
static struct passwd pwd;
struct passwd *result;
getpwent_r(&pwd, line_buff, sizeof(line_buff), &result);
return result;
}
struct group *getgrent(void)
{
static char line_buff[GRP_BUFFER_SIZE];
static struct group gr;
struct group *result;
getgrent_r(&gr, line_buff, sizeof(line_buff), &result);
return result;
}
#if ENABLE_USE_BB_SHADOW
struct spwd *getspent(void)
{
static char line_buff[PWD_BUFFER_SIZE];
static struct spwd spwd;
struct spwd *result;
getspent_r(&spwd, line_buff, sizeof(line_buff), &result);
return result;
}
struct spwd *sgetspent(const char *string)
{
static char line_buff[PWD_BUFFER_SIZE];
static struct spwd spwd;
struct spwd *result;
sgetspent_r(string, &spwd, line_buff, sizeof(line_buff), &result);
return result;
}
#endif
#endif /* UNUSED_SINCE_WE_AVOID_STATIC_BUFS */
static gid_t *getgrouplist_internal(int *ngroups_ptr, const char *user, gid_t gid)
{
FILE *grfile;
gid_t *group_list;
int ngroups;
struct group group;
char buff[PWD_BUFFER_SIZE];
/* We alloc space for 8 gids at a time. */
group_list = xmalloc(8 * sizeof(group_list[0]));
group_list[0] = gid;
ngroups = 1;
grfile = fopen_for_read(_PATH_GROUP);
if (grfile) {
while (!bb__pgsreader(bb__parsegrent, &group, buff, sizeof(buff), grfile)) {
char **m;
assert(group.gr_mem); /* Must have at least a NULL terminator. */
if (group.gr_gid == gid)
continue;
for (m = group.gr_mem; *m; m++) {
if (strcmp(*m, user) != 0)
continue;
group_list = xrealloc_vector(group_list, /*8=2^3:*/ 3, ngroups);
group_list[ngroups++] = group.gr_gid;
break;
}
}
fclose(grfile);
}
*ngroups_ptr = ngroups;
return group_list;
}
int initgroups(const char *user, gid_t gid)
{
int ngroups;
gid_t *group_list = getgrouplist_internal(&ngroups, user, gid);
ngroups = setgroups(ngroups, group_list);
free(group_list);
return ngroups;
}
int getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups)
{
int ngroups_old = *ngroups;
gid_t *group_list = getgrouplist_internal(ngroups, user, gid);
if (*ngroups <= ngroups_old) {
ngroups_old = *ngroups;
memcpy(groups, group_list, ngroups_old * sizeof(groups[0]));
} else {
ngroups_old = -1;
}
free(group_list);
return ngroups_old;
}
#ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
int putpwent(const struct passwd *__restrict p, FILE *__restrict f)
{
int rv = -1;
#if 0
/* glibc does this check */
if (!p || !f) {
errno = EINVAL;
return rv;
}
#endif
/* No extra thread locking is needed above what fprintf does. */
if (fprintf(f, "%s:%s:%lu:%lu:%s:%s:%s\n",
p->pw_name, p->pw_passwd,
(unsigned long)(p->pw_uid),
(unsigned long)(p->pw_gid),
p->pw_gecos, p->pw_dir, p->pw_shell) >= 0
) {
rv = 0;
}
return rv;
}
int putgrent(const struct group *__restrict p, FILE *__restrict f)
{
int rv = -1;
#if 0
/* glibc does this check */
if (!p || !f) {
errno = EINVAL;
return rv;
}
#endif
if (fprintf(f, "%s:%s:%lu:",
p->gr_name, p->gr_passwd,
(unsigned long)(p->gr_gid)) >= 0
) {
static const char format[] ALIGN1 = ",%s";
char **m;
const char *fmt;
fmt = format + 1;
assert(p->gr_mem);
m = p->gr_mem;
while (1) {
if (!*m) {
if (fputc('\n', f) >= 0) {
rv = 0;
}
break;
}
if (fprintf(f, fmt, *m) < 0) {
break;
}
m++;
fmt = format;
}
}
return rv;
}
#endif
#if ENABLE_USE_BB_SHADOW
#ifdef UNUSED_FOR_NOW
static const unsigned char put_sp_off[] ALIGN1 = {
offsetof(struct spwd, sp_lstchg), /* 2 - not a char ptr */
offsetof(struct spwd, sp_min), /* 3 - not a char ptr */
offsetof(struct spwd, sp_max), /* 4 - not a char ptr */
offsetof(struct spwd, sp_warn), /* 5 - not a char ptr */
offsetof(struct spwd, sp_inact), /* 6 - not a char ptr */
offsetof(struct spwd, sp_expire) /* 7 - not a char ptr */
};
int putspent(const struct spwd *p, FILE *stream)
{
const char *fmt;
long x;
int i;
int rv = -1;
/* Unlike putpwent and putgrent, glibc does not check the args. */
if (fprintf(stream, "%s:%s:", p->sp_namp,
(p->sp_pwdp ? p->sp_pwdp : "")) < 0
) {
goto DO_UNLOCK;
}
for (i = 0; i < sizeof(put_sp_off); i++) {
fmt = "%ld:";
x = *(long *)((char *)p + put_sp_off[i]);
if (x == -1) {
fmt += 3;
}
if (fprintf(stream, fmt, x) < 0) {
goto DO_UNLOCK;
}
}
if ((p->sp_flag != ~0UL) && (fprintf(stream, "%lu", p->sp_flag) < 0)) {
goto DO_UNLOCK;
}
if (fputc('\n', stream) > 0) {
rv = 0;
}
DO_UNLOCK:
return rv;
}
#endif
#endif /* USE_BB_SHADOW */
/**********************************************************************/
/* Internal functions */
/**********************************************************************/
static const unsigned char pw_off[] ALIGN1 = {
offsetof(struct passwd, pw_name), /* 0 */
offsetof(struct passwd, pw_passwd), /* 1 */
offsetof(struct passwd, pw_uid), /* 2 - not a char ptr */
offsetof(struct passwd, pw_gid), /* 3 - not a char ptr */
offsetof(struct passwd, pw_gecos), /* 4 */
offsetof(struct passwd, pw_dir), /* 5 */
offsetof(struct passwd, pw_shell) /* 6 */
};
static int FAST_FUNC bb__parsepwent(void *data, char *line)
{
char *endptr;
char *p;
int i;
i = 0;
while (1) {
p = (char *) data + pw_off[i];
if (i < 2 || i > 3) {
*((char **) p) = line;
if (i == 6) {
return 0;
}
/* NOTE: glibc difference - glibc allows omission of
* ':' seperators after the gid field if all remaining
* entries are empty. We require all separators. */
line = strchr(line, ':');
if (!line) {
break;
}
} else {
unsigned long t = strtoul(line, &endptr, 10);
/* Make sure we had at least one digit, and that the
* failing char is the next field seperator ':'. See
* glibc difference note above. */
/* TODO: Also check for leading whitespace? */
if ((endptr == line) || (*endptr != ':')) {
break;
}
line = endptr;
if (i & 1) { /* i == 3 -- gid */
*((gid_t *) p) = t;
} else { /* i == 2 -- uid */
*((uid_t *) p) = t;
}
}
*line++ = '\0';
i++;
} /* while (1) */
return -1;
}
/**********************************************************************/
static const unsigned char gr_off[] ALIGN1 = {
offsetof(struct group, gr_name), /* 0 */
offsetof(struct group, gr_passwd), /* 1 */
offsetof(struct group, gr_gid) /* 2 - not a char ptr */
};
static int FAST_FUNC bb__parsegrent(void *data, char *line)
{
char *endptr;
char *p;
int i;
char **members;
char *end_of_buf;
end_of_buf = ((struct group *) data)->gr_name; /* Evil hack! */
i = 0;
while (1) {
p = (char *) data + gr_off[i];
if (i < 2) {
*((char **) p) = line;
line = strchr(line, ':');
if (!line) {
break;
}
*line++ = '\0';
i++;
} else {
*((gid_t *) p) = strtoul(line, &endptr, 10);
/* NOTE: glibc difference - glibc allows omission of the
* trailing colon when there is no member list. We treat
* this as an error. */
/* Make sure we had at least one digit, and that the
* failing char is the next field seperator ':'. See
* glibc difference note above. */
if ((endptr == line) || (*endptr != ':')) {
break;
}
i = 1; /* Count terminating NULL ptr. */
p = endptr;
if (p[1]) { /* We have a member list to process. */
/* Overwrite the last ':' with a ',' before counting.
* This allows us to (1) test for initial ','
* and (2) adds one ',' so that the number of commas
* equals the member count. */
*p = ',';
do {
/* NOTE: glibc difference - glibc allows and trims leading
* (but not trailing) space. We treat this as an error. */
/* NOTE: glibc difference - glibc allows consecutive and
* trailing commas, and ignores "empty string" users. We
* treat this as an error. */
if (*p == ',') {
++i;
*p = 0; /* nul-terminate each member string. */
if (!*++p || (*p == ',') || isspace(*p)) {
goto ERR;
}
}
} while (*++p);
}
/* Now align (p+1), rounding up. */
/* Assumes sizeof(char **) is a power of 2. */
members = (char **)( (((intptr_t) p) + sizeof(char **))
& ~((intptr_t)(sizeof(char **) - 1)) );
if (((char *)(members + i)) > end_of_buf) { /* No space. */
break;
}
((struct group *) data)->gr_mem = members;
if (--i) {
p = endptr; /* Pointing to char prior to first member. */
while (1) {
*members++ = ++p;
if (!--i)
break;
while (*++p)
continue;
}
}
*members = NULL;
return 0;
}
} /* while (1) */
ERR:
return -1;
}
/**********************************************************************/
#if ENABLE_USE_BB_SHADOW
static const unsigned char sp_off[] ALIGN1 = {
offsetof(struct spwd, sp_namp), /* 0: char* */
offsetof(struct spwd, sp_pwdp), /* 1: char* */
offsetof(struct spwd, sp_lstchg), /* 2: long */
offsetof(struct spwd, sp_min), /* 3: long */
offsetof(struct spwd, sp_max), /* 4: long */
offsetof(struct spwd, sp_warn), /* 5: long */
offsetof(struct spwd, sp_inact), /* 6: long */
offsetof(struct spwd, sp_expire), /* 7: long */
offsetof(struct spwd, sp_flag) /* 8: unsigned long */
};
static int FAST_FUNC bb__parsespent(void *data, char *line)
{
char *endptr;
char *p;
int i;
i = 0;
while (1) {
p = (char *) data + sp_off[i];
if (i < 2) {
*((char **) p) = line;
line = strchr(line, ':');
if (!line) {
break; /* error */
}
} else {
*((long *) p) = strtoul(line, &endptr, 10);
if (endptr == line) {
*((long *) p) = -1L;
}
line = endptr;
if (i == 8) {
if (*line != '\0') {
break; /* error */
}
return 0; /* all ok */
}
if (*line != ':') {
break; /* error */
}
}
*line++ = '\0';
i++;
}
return EINVAL;
}
#endif
/**********************************************************************/
/* Reads until EOF, or until it finds a line which fits in the buffer
* and for which the parser function succeeds.
*
* Returns 0 on success and ENOENT for end-of-file (glibc convention).
*/
static int bb__pgsreader(
int FAST_FUNC (*parserfunc)(void *d, char *line),
void *data,
char *__restrict line_buff,
size_t buflen,
FILE *f)
{
int skip;
int rv = ERANGE;
if (buflen < PWD_BUFFER_SIZE) {
errno = rv;
return rv;
}
skip = 0;
while (1) {
if (!fgets(line_buff, buflen, f)) {
if (feof(f)) {
rv = ENOENT;
}
break;
}
{
int line_len = strlen(line_buff) - 1;
if (line_len >= 0 && line_buff[line_len] == '\n') {
line_buff[line_len] = '\0';
} else
if (line_len + 2 == buflen) {
/* A start (or continuation) of overlong line */
skip = 1;
continue;
} /* else: a last line in the file, and it has no '\n' */
}
if (skip) {
/* This "line" is a remainder of overlong line, ignore */
skip = 0;
continue;
}
/* NOTE: glibc difference - glibc strips leading whitespace from
* records. We do not allow leading whitespace. */
/* Skip empty lines, comment lines, and lines with leading
* whitespace. */
if (line_buff[0] != '\0' && line_buff[0] != '#' && !isspace(line_buff[0])) {
if (parserfunc == bb__parsegrent) {
/* Do evil group hack:
* The group entry parsing function needs to know where
* the end of the buffer is so that it can construct the
* group member ptr table. */
((struct group *) data)->gr_name = line_buff + buflen;
}
if (parserfunc(data, line_buff) == 0) {
rv = 0;
break;
}
}
} /* while (1) */
return rv;
}