pwd_grp.c

Axis 221 camera embedded programing interface

{
	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) {
		if (!(spf = fopen(_PATH_SHADOW, "r"))) {
			rv = errno;
			goto ERR;
		}
		__STDIO_SET_USER_LOCKING(spf);
	}

	if (!(rv = __pgsreader(__parsespent, resultbuf,
						   buffer, buflen, spf))) {
		*result = resultbuf;
	}

 ERR:
	UNLOCK;

	return rv;
}

#endif
/**********************************************************************/
#ifdef L_getpwent

struct passwd *getpwent(void)
{
	static char line_buff[__UCLIBC_PWD_BUFFER_SIZE__];
	static struct passwd pwd;
	struct passwd *result;

	getpwent_r(&pwd, line_buff, sizeof(line_buff), &result);
	return result;
}

#endif
/**********************************************************************/
#ifdef L_getgrent

struct group *getgrent(void)
{
	static char line_buff[__UCLIBC_GRP_BUFFER_SIZE__];
	static struct group gr;
	struct group *result;

	getgrent_r(&gr, line_buff, sizeof(line_buff), &result);
	return result;
}

#endif
/**********************************************************************/
#ifdef L_getspent

struct spwd *getspent(void)
{
	static char line_buff[__UCLIBC_PWD_BUFFER_SIZE__];
	static struct spwd spwd;
	struct spwd *result;

	getspent_r(&spwd, line_buff, sizeof(line_buff), &result);
	return result;
}

#endif
/**********************************************************************/
#ifdef L_sgetspent

struct spwd *sgetspent(const char *string)
{
	static char line_buff[__UCLIBC_PWD_BUFFER_SIZE__];
	static struct spwd spwd;
	struct spwd *result;

	sgetspent_r(string, &spwd, line_buff, sizeof(line_buff), &result);
	return result;
}

#endif
/**********************************************************************/
#ifdef L_initgroups

int initgroups(const char *user, gid_t gid)
{
	FILE *grf;
	gid_t *group_list;
	int num_groups, rv;
	char **m;
	struct group group;
	char buff[__UCLIBC_PWD_BUFFER_SIZE__];

	rv = -1;

	/* We alloc space for 8 gids at a time. */
	if (((group_list = (gid_t *) malloc(8*sizeof(gid_t *))) != NULL)
		&& ((grf = fopen(_PATH_GROUP, "r")) != NULL)
		) {

		__STDIO_SET_USER_LOCKING(grf);

		*group_list = gid;
		num_groups = 1;

		while (!__pgsreader(__parsegrent, &group, buff, sizeof(buff), grf)) {
			assert(group.gr_mem); /* Must have at least a NULL terminator. */
			if (group.gr_gid != gid) {
				for (m=group.gr_mem ; *m ; m++) {
					if (!strcmp(*m, user)) {
						if (!(num_groups & 7)) {
							gid_t *tmp = (gid_t *)
								realloc(group_list,
										(num_groups+8) * sizeof(gid_t *));
							if (!tmp) {
								rv = -1;
								goto DO_CLOSE;
							}
							group_list = tmp;
						}
						group_list[num_groups++] = group.gr_gid;
						break;
					}
				}
			}
		}

		rv = setgroups(num_groups, group_list);
	DO_CLOSE:
		fclose(grf);
	}

	/* group_list will be NULL if initial malloc failed, which may trigger
	 * warnings from various malloc debuggers. */
	free(group_list);
	return rv;
}

#endif
/**********************************************************************/
#ifdef L_putpwent

int putpwent(const struct passwd *__restrict p, FILE *__restrict f)
{
	int rv = -1;

	if (!p || !f) {
		__set_errno(EINVAL);
	} else {
		/* 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;
}

#endif
/**********************************************************************/
#ifdef L_putgrent

int putgrent(const struct group *__restrict p, FILE *__restrict f)
{
	static const char format[] = ",%s";
	char **m;
	const char *fmt;
	int rv = -1;
	__STDIO_AUTO_THREADLOCK_VAR;

	if (!p || !f) {				/* Sigh... glibc checks. */
		__set_errno(EINVAL);
	} else {
		__STDIO_AUTO_THREADLOCK(f);

		if (fprintf(f, "%s:%s:%lu:",
					p->gr_name, p->gr_passwd,
					(unsigned long)(p->gr_gid)) >= 0
			) {

			fmt = format + 1;

			assert(p->gr_mem);
			m = p->gr_mem;

			do {
				if (!*m) {
					if (fputc_unlocked('\n', f) >= 0) {
						rv = 0;
					}
					break;
				}
				if (fprintf(f, fmt, *m) < 0) {
					break;
				}
				++m;
				fmt = format;
			} while (1);

		}

		__STDIO_AUTO_THREADUNLOCK(f);
	}

	return rv;
}

#endif
/**********************************************************************/
#ifdef L_putspent

static const unsigned char sp_off[] = {
	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)
{
	static const char ld_format[] = "%ld:";
	const char *f;
	long int x;
	int i;
	int rv = -1;
	__STDIO_AUTO_THREADLOCK_VAR;

	/* Unlike putpwent and putgrent, glibc does not check the args. */

	__STDIO_AUTO_THREADLOCK(stream);

	if (fprintf(stream, "%s:%s:", p->sp_namp,
				(p->sp_pwdp ? p->sp_pwdp : "")) < 0
		) {
		goto DO_UNLOCK;
	}

	for (i=0 ; i < sizeof(sp_off) ; i++) {
		f = ld_format;
		if ((x = *(const long int *)(((const char *) p) + sp_off[i])) == -1) {
			f += 3;
		}
		if (fprintf(stream, f, x) < 0) {
			goto DO_UNLOCK;
		}
	}

	if ((p->sp_flag != ~0UL) && (fprintf(stream, "%lu", p->sp_flag) < 0)) {
		goto DO_UNLOCK;
	}

	if (fputc_unlocked('\n', stream) > 0) {
		rv = 0;
	}

 DO_UNLOCK:
	__STDIO_AUTO_THREADUNLOCK(stream);

	return rv;
}

#endif
/**********************************************************************/
/* Internal uClibc functions.                                         */
/**********************************************************************/
#ifdef L___parsepwent

static const unsigned char pw_off[] = {
	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 */
};

int __parsepwent(void *data, char *line)
{
	char *endptr;
	char *p;
	int i;

	i = 0;
	do {
		p = ((char *) ((struct passwd *) data)) + pw_off[i];

		if ((i & 6) ^ 2) { 	/* i!=2 and 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. */
			if (!(line = strchr(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;
}

#endif
/**********************************************************************/
#ifdef L___parsegrent

static const unsigned char gr_off[] = {
	offsetof(struct group, gr_name), 	/* 0 */
	offsetof(struct group, gr_passwd),	/* 1 */
	offsetof(struct group, gr_gid)		/* 2 - not a char ptr */
};

int __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;
	do {
		p = ((char *) ((struct group *) data)) + gr_off[i];

		if (i < 2) {
			*((char **) p) = line;
			if (!(line = strchr(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 test for initial ',' and adds
				 * one ',' so that the ',' count 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. */
				do {
					*members++ = ++p;
					if (!--i) break;
					while (*++p) {}
				} while (1);
			}				
			*members = NULL;

			return 0;
		}
	} while (1);

 ERR:
	return -1;
}

#endif
/**********************************************************************/
#ifdef L___parsespent

static const unsigned char sp_off[] = {
	offsetof(struct spwd, sp_namp),		/* 0 */
	offsetof(struct spwd, sp_pwdp),		/* 1 */
	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 */
	offsetof(struct spwd, sp_flag) 		/* 8 - not a char ptr */
};

int __parsespent(void *data, char * line)
{
	char *endptr;
	char *p;
	int i;

	i = 0;
	do {
		p = ((char *) ((struct spwd *) data)) + sp_off[i];
		if (i < 2) {
			*((char **) p) = line;
			if (!(line = strchr(line, ':'))) {
				break;
			}
		} else {
#if 0
			if (i==5) {			/* Support for old format. */
				while (isspace(*line)) ++line; /* glibc eats space here. */
				if (!*line) {
					((struct spwd *) data)->sp_warn = -1;
					((struct spwd *) data)->sp_inact = -1;
					((struct spwd *) data)->sp_expire = -1;
					((struct spwd *) data)->sp_flag = ~0UL;
					return 0;
				}
			}
#endif

			*((long *) p) = (long) strtoul(line, &endptr, 10);

			if (endptr == line) {
				*((long *) p) = ((i != 8) ? -1L : ((long)(~0UL)));
			}

			line = endptr;

			if (i == 8) {
				if (!*endptr) {
					return 0;
				}
				break;
			}

			if (*endptr != ':') {
				break;
			}

		}

		*line++ = 0;
		++i;
	} while (1);

	return EINVAL;
}

#endif
/**********************************************************************/
#ifdef L___pgsreader

/* Reads until if EOF, or until if 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 concession).
 */

int __pgsreader(int (*__parserfunc)(void *d, char *line), void *data,
				char *__restrict line_buff, size_t buflen, FILE *f)
{
	int line_len;
	int skip;
	int rv = ERANGE;
	__STDIO_AUTO_THREADLOCK_VAR;

	if (buflen < __UCLIBC_PWD_BUFFER_SIZE__) {
		__set_errno(rv);
	} else {
		__STDIO_AUTO_THREADLOCK(f);

		skip = 0;
		do {
			if (!fgets_unlocked(line_buff, buflen, f)) {
				if (feof_unlocked(f)) {
					rv = ENOENT;
				}
				break;
			}

			line_len = strlen(line_buff) - 1; /* strlen() must be > 0. */
			if (line_buff[line_len] == '\n') {
				line_buff[line_len] = 0;
			} else if (line_len + 2 == buflen) { /* line too long */
				++skip;
				continue;
			}

			if (skip) {
				--skip;
				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 && (*line_buff != '#') && !isspace(*line_buff)) {
				if (__parserfunc == __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)) {
					rv = 0;
					break;
				}
			}
		} while (1);

		__STDIO_AUTO_THREADUNLOCK(f);
	}

	return rv;
}

#endif
/**********************************************************************/