/* vi: set sw=4 ts=4: */
-/* Copyright (C) 2003 Manuel Novoa III
+/* Copyright (C) 2014 Tito Ragusa <farmatito@tiscali.it>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-
-/* Nov 6, 2003 Initial version.
+/* This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY!!
*
- * 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.
+ * Rewrite of some parts. Main differences are:
*
- * 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.
+ * 1) the buffer for getpwuid, getgrgid, getpwnam, getgrnam is dynamically
+ * allocated and reused by later calls. if ERANGE error pops up it is
+ * reallocated to the size of the longest line found so far in the
+ * passwd/group files and reused for later calls.
+ * If ENABLE_FEATURE_CLEAN_UP is set the buffers are freed at program
+ * exit using the atexit function to make valgrind happy.
+ * 2) the passwd/group files:
+ * a) must contain the expected number of fields (as per count of field
+ * delimeters ":") or we will complain with a error message.
+ * b) leading or trailing whitespace in fields is allowed and handled.
+ * c) some fields are not allowed to be empty (e.g. username, uid/gid,
+ * homedir, shell) and in this case NULL is returned and errno is
+ * set to EINVAL. This behaviour could be easily changed by
+ * modifying PW_DEF, GR_DEF, SP_DEF strings (uppercase
+ * makes a field mandatory).
+ * d) the string representing uid/gid must be convertible by strtoXX
+ * functions or NULL is returned and errno is set to EINVAL.
+ * e) leading or trailing whitespaces in member names and empty members
+ * are allowed and handled.
+ * 3) the internal function for getgrouplist uses a dynamically allocated
+ * buffer and retries with a bigger one in case it is too small;
+ * 4) the _r functions use the user supplied buffers that are never reallocated
+ * but use mostly the same common code as the other functions.
+ * 5) at the moment only the functions really used by busybox code are
+ * implemented, if you need a particular missing function it should be
+ * easy to write it by using the internal common code.
*/
#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. */
+/* S = string not empty, s = string maybe empty, */
+/* I = uid,gid, l = long maybe empty, m = members,*/
+/* r = reserved */
+#define PW_DEF "SsIIsSS"
+#define GR_DEF "SsIm"
+#define SP_DEF "Ssllllllr"
+
+static const uint8_t pw_off[] ALIGN1 = {
+ offsetof(struct passwd, pw_name), /* 0 S */
+ offsetof(struct passwd, pw_passwd), /* 1 s */
+ offsetof(struct passwd, pw_uid), /* 2 I */
+ offsetof(struct passwd, pw_gid), /* 3 I */
+ offsetof(struct passwd, pw_gecos), /* 4 s */
+ offsetof(struct passwd, pw_dir), /* 5 S */
+ offsetof(struct passwd, pw_shell) /* 6 S */
+};
+static const uint8_t gr_off[] ALIGN1 = {
+ offsetof(struct group, gr_name), /* 0 S */
+ offsetof(struct group, gr_passwd), /* 1 s */
+ offsetof(struct group, gr_gid), /* 2 I */
+ offsetof(struct group, gr_mem) /* 3 m (char **) */
+};
+#if ENABLE_USE_BB_SHADOW
+static const uint8_t sp_off[] ALIGN1 = {
+ offsetof(struct spwd, sp_namp), /* 0 S Login name */
+ offsetof(struct spwd, sp_pwdp), /* 1 s Encrypted password */
+ offsetof(struct spwd, sp_lstchg), /* 2 l */
+ offsetof(struct spwd, sp_min), /* 3 l */
+ offsetof(struct spwd, sp_max), /* 4 l */
+ offsetof(struct spwd, sp_warn), /* 5 l */
+ offsetof(struct spwd, sp_inact), /* 6 l */
+ offsetof(struct spwd, sp_expire), /* 7 l */
+ offsetof(struct spwd, sp_flag) /* 8 r Reserved */
+};
+#endif
-static int bb__pgsreader(
- int FAST_FUNC (*parserfunc)(void *d, char *line),
- void *data,
- char *__restrict line_buff,
- size_t buflen,
- FILE *f);
+struct const_passdb {
+ const char *filename;
+ const uint8_t *off;
+ const char def[10];
+ uint8_t numfields;
+ uint8_t size_of;
+};
+struct passdb {
+ const char *filename;
+ const uint8_t *off;
+ const char def[10];
+ uint8_t numfields;
+ uint8_t size_of;
+ FILE *fp;
+ void *malloced;
+};
-static int FAST_FUNC bb__parsepwent(void *pw, char *line);
-static int FAST_FUNC bb__parsegrent(void *gr, char *line);
+static const struct const_passdb const_pw_db = { _PATH_PASSWD, pw_off, PW_DEF, sizeof(PW_DEF)-1, sizeof(struct passwd) };
+static const struct const_passdb const_gr_db = { _PATH_GROUP , gr_off, GR_DEF, sizeof(GR_DEF)-1, sizeof(struct group) };
#if ENABLE_USE_BB_SHADOW
-static int FAST_FUNC bb__parsespent(void *sp, char *line);
+static const struct const_passdb const_sp_db = { _PATH_SHADOW, sp_off, SP_DEF, sizeof(SP_DEF)-1, sizeof(struct spwd) };
#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*/;
+ struct passdb db[2 + ENABLE_USE_BB_SHADOW];
+ char *tokenize_end;
};
static struct statics *ptr_to_statics;
+#define S (*ptr_to_statics)
+#define has_S (ptr_to_statics)
static struct statics *get_S(void)
{
- if (!ptr_to_statics)
- ptr_to_statics = xzalloc(sizeof(*ptr_to_statics));
+ if (!ptr_to_statics) {
+ ptr_to_statics = xzalloc(sizeof(S));
+ memcpy(&S.db[0], &const_pw_db, sizeof(const_pw_db));
+ memcpy(&S.db[1], &const_gr_db, sizeof(const_gr_db));
+#if ENABLE_USE_BB_SHADOW
+ memcpy(&S.db[2], &const_sp_db, sizeof(const_sp_db));
+#endif
+ }
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.
- */
+/* Internal functions */
/**********************************************************************/
-int fgetpwent_r(FILE *__restrict stream, struct passwd *__restrict resultbuf,
- char *__restrict buffer, size_t buflen,
- struct passwd **__restrict result)
+/* Divide the passwd/group/shadow record in fields
+ * by substituting the given delimeter
+ * e.g. ':' or ',' with '\0'.
+ * Returns the number of fields found.
+ * Strips leading and trailing whitespace in fields.
+ */
+static int tokenize(char *buffer, int ch)
{
- int rv;
+ char *p = buffer;
+ char *s = p;
+ int num_fields = 0;
- *result = NULL;
-
- rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, stream);
- if (!rv) {
- *result = resultbuf;
+ for (;;) {
+ if (isblank(*s)) {
+ overlapping_strcpy(s, skip_whitespace(s));
+ }
+ if (*p == ch || *p == '\0') {
+ char *end = p;
+ while (p != s && isblank(p[-1]))
+ p--;
+ if (p != end)
+ overlapping_strcpy(p, end);
+ num_fields++;
+ if (*end == '\0') {
+ S.tokenize_end = p + 1;
+ return num_fields;
+ }
+ *p = '\0';
+ s = p + 1;
+ }
+ p++;
}
-
- return rv;
}
-int fgetgrent_r(FILE *__restrict stream, struct group *__restrict resultbuf,
- char *__restrict buffer, size_t buflen,
- struct group **__restrict result)
-{
- int rv;
+/* Returns !NULL on success and matching line broken up in fields by '\0' in buf.
+ * We require the expected number of fields to be found.
+ */
+static char *parse_common(FILE *fp, const char *filename,
+ int n_fields,
+ const char *key, int field_pos)
+{
+ int count = 0;
+ char *buf;
+
+ while ((buf = xmalloc_fgetline(fp)) != NULL) {
+ count++;
+ /* Skip empty lines, comment lines */
+ if (buf[0] == '\0' || buf[0] == '#')
+ goto free_and_next;
+ if (tokenize(buf, ':') != n_fields) {
+ /* number of fields is wrong */
+ bb_error_msg("bad record at %s:%u", filename, count);
+ goto free_and_next;
+ }
- *result = NULL;
+/* Ugly hack: group db requires aqdditional buffer space
+ * for members[] array. If there is only one group, we need space
+ * for 3 pointers: alignment padding, group name, NULL.
+ * +1 for every additional group.
+ */
+ if (n_fields == sizeof(GR_DEF)-1) { /* if we read group file */
+ int resize = 3;
+ char *p = buf;
+ while (*p)
+ if (*p++ == ',')
+ resize++;
+ resize *= sizeof(char**);
+ resize += S.tokenize_end - buf;
+ buf = xrealloc(buf, resize);
+ }
- rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, stream);
- if (!rv) {
- *result = resultbuf;
+ if (!key) {
+ /* no key specified: sequential read, return a record */
+ break;
+ }
+ if (strcmp(key, nth_string(buf, field_pos)) == 0) {
+ /* record found */
+ break;
+ }
+ free_and_next:
+ free(buf);
}
- return rv;
+ return buf;
}
-#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)
+static char *parse_file(const char *filename,
+ int n_fields,
+ const char *key, int field_pos)
{
- int rv;
+ char *buf = NULL;
+ FILE *fp = fopen_for_read(filename);
- *result = NULL;
-
- rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, stream);
- if (!rv) {
- *result = resultbuf;
+ if (fp) {
+ buf = parse_common(fp, filename, n_fields, key, field_pos);
+ fclose(fp);
}
-
- 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;
+ return buf;
}
-struct group *fgetgrent(FILE *stream)
+/* Convert passwd/group/shadow file record in buffer to a struct */
+static void *convert_to_struct(const char *def, const unsigned char *off,
+ char *buffer, void *result)
{
- 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
+ for (;;) {
+ void *member = (char*)result + (*off++);
+ if ((*def | 0x20) == 's') { /* s or S */
+ *(char **)member = (char*)buffer;
+ if (!buffer[0] && (*def == 'S')) {
+ errno = EINVAL;
+ }
+ }
+ if (*def == 'I') {
+ *(int *)member = bb_strtou(buffer, NULL, 10);
+ }
#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;
-}
+ if (*def == 'l') {
+ long n = -1;
+ if (buffer[0])
+ n = bb_strtol(buffer, NULL, 10);
+ *(long *)member = n;
+ }
#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;
+ if (*def == 'm') {
+ char **members;
+ int i = tokenize(buffer, ',');
+
+ /* Store members[] after buffer's end.
+ * This is safe ONLY because there is a hack
+ * in parse_common() which allocates additional space
+ * at the end of malloced buffer!
+ */
+ members = (char **)
+ ( ((intptr_t)S.tokenize_end + sizeof(char**))
+ & -(intptr_t)sizeof(char**)
+ );
+
+ ((struct group *)result)->gr_mem = members;
+ while (--i >= 0) {
+ *members++ = buffer;
+ buffer += strlen(buffer) + 1;
+ }
+ *members = NULL;
}
- strcpy(buffer, string);
- }
+ /* def "r" does nothing */
- rv = bb__parsespent(result_buf, buffer);
- if (!rv) {
- *result = result_buf;
+ def++;
+ if (*def == '\0')
+ break;
+ buffer += strlen(buffer) + 1;
}
- 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);
+ if (errno)
+ result = NULL;
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;
+/****** getXXnam/id_r */
- 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)
+static int getXXnam_r(const char *name, uintptr_t db_and_field_pos, char *buffer, size_t buflen,
+ void *result)
{
- int rv;
- struct passwd *pp;
- struct passwd password;
- char pwd_buff[PWD_BUFFER_SIZE];
+ void *struct_buf = *(void**)result;
+ char *buf;
+ struct passdb *db;
+ get_S();
+ db = &S.db[db_and_field_pos >> 2];
- *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);
+ *(void**)result = NULL;
+ buf = parse_file(db->filename, db->numfields, name, db_and_field_pos & 3);
+ if (buf) {
+ size_t size = S.tokenize_end - buf;
+ if (size > buflen) {
+ errno = ERANGE;
+ } else {
+ memcpy(buffer, buf, size);
+ *(void**)result = convert_to_struct(db->def, db->off, buffer, struct_buf);
+ }
+ free(buf);
}
-
- 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;
+ /* "The reentrant functions return zero on success.
+ * In case of error, an error number is returned."
+ * NB: not finding the record is also a "success" here:
+ */
+ return errno;
}
-/* This one has many users */
-struct group *getgrnam(const char *name)
+int getpwnam_r(const char *name, struct passwd *struct_buf, char *buffer, size_t buflen,
+ struct passwd **result)
{
- 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;
+ /* Why the "store buffer address in result" trick?
+ * This way, getXXnam_r has the same ABI signature as getpwnam_r,
+ * hopefully compiler can optimize tall call better in this case.
+ */
+ *result = struct_buf;
+ return getXXnam_r(name, (0 << 2) + 0, buffer, buflen, result);
}
-
-#if 0 //ENABLE_USE_BB_SHADOW
-struct spwd *getspnam(const char *name)
+#if ENABLE_USE_BB_SHADOW
+int getspnam_r(const char *name, struct spwd *struct_buf, char *buffer, size_t buflen,
+ struct spwd **result)
{
- 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;
+ *result = struct_buf;
+ return getXXnam_r(name, (2 << 2) + 0, buffer, buflen, 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;
-}
-
+/****** getXXent_r */
-int getpwent_r(struct passwd *__restrict resultbuf,
- char *__restrict buffer, size_t buflen,
- struct passwd **__restrict result)
+static int getXXent_r(void *struct_buf, char *buffer, size_t buflen,
+ void *result,
+ unsigned db_idx)
{
- int rv;
+ char *buf;
+ struct passdb *db;
+ get_S();
+ db = &S.db[db_idx];
- LOCK;
- *result = NULL; /* In case of error... */
+ *(void**)result = NULL;
- if (!pwf) {
- pwf = fopen_for_read(_PATH_PASSWD);
- if (!pwf) {
- rv = errno;
- goto ERR;
+ if (!db->fp) {
+ db->fp = fopen_for_read(db->filename);
+ if (!db->fp) {
+ return errno;
}
- close_on_exec_on(fileno(pwf));
+ close_on_exec_on(fileno(db->fp));
}
- rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, pwf);
- if (!rv) {
- *result = resultbuf;
+ buf = parse_common(db->fp, db->filename, db->numfields, /*no search key:*/ NULL, 0);
+ if (buf) {
+ size_t size = S.tokenize_end - buf;
+ if (size > buflen) {
+ errno = ERANGE;
+ } else {
+ memcpy(buffer, buf, size);
+ *(void**)result = convert_to_struct(db->def, db->off, buffer, struct_buf);
+ }
+ free(buf);
}
-
- ERR:
- UNLOCK;
- return rv;
+ /* "The reentrant functions return zero on success.
+ * In case of error, an error number is returned."
+ * NB: not finding the record is also a "success" here:
+ */
+ return errno;
}
-static FILE *grf /*= NULL*/;
-void setgrent(void)
+int getpwent_r(struct passwd *struct_buf, char *buffer, size_t buflen, struct passwd **result)
{
- LOCK;
- if (grf) {
- rewind(grf);
- }
- UNLOCK;
+ return getXXent_r(struct_buf, buffer, buflen, result, 0);
}
-void endgrent(void)
-{
- LOCK;
- if (grf) {
- fclose(grf);
- grf = NULL;
- }
- UNLOCK;
-}
+/****** getXXnam/id */
-int getgrent_r(struct group *__restrict resultbuf,
- char *__restrict buffer, size_t buflen,
- struct group **__restrict result)
+static void *getXXnam(const char *name, unsigned db_and_field_pos)
{
- int rv;
+ char *buf;
+ void *result;
+ struct passdb *db;
+ get_S();
+ db = &S.db[db_and_field_pos >> 2];
- LOCK;
- *result = NULL; /* In case of error... */
+ result = NULL;
- if (!grf) {
- grf = fopen_for_read(_PATH_GROUP);
- if (!grf) {
- rv = errno;
- goto ERR;
+ if (!db->fp) {
+ db->fp = fopen_for_read(db->filename);
+ if (!db->fp) {
+ return NULL;
}
- close_on_exec_on(fileno(grf));
+ close_on_exec_on(fileno(db->fp));
}
- rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, grf);
- if (!rv) {
- *result = resultbuf;
+ free(db->malloced);
+ db->malloced = NULL;
+ buf = parse_common(db->fp, db->filename, db->numfields, name, db_and_field_pos & 3);
+ if (buf) {
+ db->malloced = xzalloc(db->size_of);
+ result = convert_to_struct(db->def, db->off, buf, db->malloced);
}
-
- ERR:
- UNLOCK;
- return rv;
+ return result;
}
-#ifdef UNUSED_FOR_NOW
-#if ENABLE_USE_BB_SHADOW
-static FILE *spf /*= NULL*/;
-void setspent(void)
+struct passwd *getpwnam(const char *name)
{
- LOCK;
- if (spf) {
- rewind(spf);
- }
- UNLOCK;
+ return getXXnam(name, (0 << 2) + 0);
}
-
-void endspent(void)
+struct group *getgrnam(const char *name)
{
- LOCK;
- if (spf) {
- fclose(spf);
- spf = NULL;
- }
- UNLOCK;
+ return getXXnam(name, (1 << 2) + 0);
}
-
-int getspent_r(struct spwd *resultbuf, char *buffer,
- size_t buflen, struct spwd **result)
+struct passwd *getpwuid(uid_t id)
{
- 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;
+ return getXXnam(utoa(id), (0 << 2) + 2);
}
-#endif
-#endif /* UNUSED_FOR_NOW */
-
-#ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
-struct passwd *getpwent(void)
+struct group *getgrgid(gid_t id)
{
- 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;
+ return getXXnam(utoa(id), (1 << 2) + 2);
}
-struct group *getgrent(void)
-{
- static char line_buff[GRP_BUFFER_SIZE];
- static struct group gr;
- struct group *result;
+/****** end/setXXend */
- getgrent_r(&gr, line_buff, sizeof(line_buff), &result);
- return result;
+void endpwent(void)
+{
+ if (has_S && S.db[0].fp) {
+ fclose(S.db[0].fp);
+ S.db[0].fp = NULL;
+ }
}
-
-#if ENABLE_USE_BB_SHADOW
-struct spwd *getspent(void)
+void setpwent(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;
+ if (has_S && S.db[0].fp) {
+ rewind(S.db[0].fp);
+ }
}
-
-struct spwd *sgetspent(const char *string)
+void endgrent(void)
{
- 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;
+ if (has_S && S.db[1].fp) {
+ fclose(S.db[1].fp);
+ S.db[1].fp = NULL;
+ }
}
-#endif
-#endif /* UNUSED_SINCE_WE_AVOID_STATIC_BUFS */
-static gid_t *getgrouplist_internal(int *ngroups_ptr, const char *user, gid_t gid)
+/****** initgroups and getgrouplist */
+
+static gid_t* FAST_FUNC getgrouplist_internal(int *ngroups_ptr,
+ const char *user, gid_t gid)
{
- FILE *grfile;
+ FILE *fp;
gid_t *group_list;
int ngroups;
- struct group group;
- char buff[PWD_BUFFER_SIZE];
+
+ get_S();
/* 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)) {
+ fp = fopen_for_read(_PATH_GROUP);
+ if (fp) {
+ char *buf;
+ while ((buf = parse_common(fp, _PATH_GROUP, sizeof(GR_DEF)-1, NULL, 0)) != NULL) {
char **m;
- assert(group.gr_mem); /* Must have at least a NULL terminator. */
+ struct group group;
+ if (!convert_to_struct(GR_DEF, gr_off, buf, &group))
+ goto next;
if (group.gr_gid == gid)
- continue;
+ goto next;
for (m = group.gr_mem; *m; m++) {
if (strcmp(*m, user) != 0)
continue;
group_list[ngroups++] = group.gr_gid;
break;
}
+ next:
+ free(buf);
}
- fclose(grfile);
+ fclose(fp);
}
*ngroups_ptr = ngroups;
return group_list;
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;
-}
projects / oweals / busybox.git / commitdiff