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-rw-r--r--pw/libutil/login_cap.c821
1 files changed, 821 insertions, 0 deletions
diff --git a/pw/libutil/login_cap.c b/pw/libutil/login_cap.c
new file mode 100644
index 0000000..b544b69
--- /dev/null
+++ b/pw/libutil/login_cap.c
@@ -0,0 +1,821 @@
+/*-
+ * Copyright (c) 1996 by
+ * Sean Eric Fagan <sef@kithrup.com>
+ * David Nugent <davidn@blaze.net.au>
+ * All rights reserved.
+ *
+ * Portions copyright (c) 1995,1997
+ * Berkeley Software Design, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, is permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice immediately at the beginning of the file, without modification,
+ * this list of conditions, and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. This work was done expressly for inclusion into FreeBSD. Other use
+ * is permitted provided this notation is included.
+ * 4. Absolutely no warranty of function or purpose is made by the authors.
+ * 5. Modifications may be freely made to this file providing the above
+ * conditions are met.
+ *
+ * Low-level routines relating to the user capabilities database
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/param.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libutil.h>
+#include <login_cap.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+
+#include "reallocarray.h"
+
+/*
+ * allocstr()
+ * Manage a single static pointer for handling a local char* buffer,
+ * resizing as necessary to contain the string.
+ *
+ * allocarray()
+ * Manage a static array for handling a group of strings, resizing
+ * when necessary.
+ */
+
+static int lc_object_count = 0;
+
+static size_t internal_stringsz = 0;
+static char * internal_string = NULL;
+static size_t internal_arraysz = 0;
+static const char ** internal_array = NULL;
+
+static char path_login_conf[] = _PATH_LOGIN_CONF;
+
+static char *
+allocstr(const char *str)
+{
+ char *p;
+
+ size_t sz = strlen(str) + 1; /* realloc() only if necessary */
+ if (sz <= internal_stringsz)
+ p = strcpy(internal_string, str);
+ else if ((p = realloc(internal_string, sz)) != NULL) {
+ internal_stringsz = sz;
+ internal_string = strcpy(p, str);
+ }
+ return p;
+}
+
+
+static const char **
+allocarray(size_t sz)
+{
+ static const char **p;
+
+ if (sz <= internal_arraysz)
+ p = internal_array;
+ else if ((p = reallocarray(internal_array, sz, sizeof(char*))) != NULL) {
+ internal_arraysz = sz;
+ internal_array = p;
+ }
+ return p;
+}
+
+
+/*
+ * arrayize()
+ * Turn a simple string <str> separated by any of
+ * the set of <chars> into an array. The last element
+ * of the array will be NULL, as is proper.
+ * Free using freearraystr()
+ */
+
+static const char **
+arrayize(const char *str, const char *chars, int *size)
+{
+ int i;
+ char *ptr;
+ const char *cptr;
+ const char **res = NULL;
+
+ /* count the sub-strings */
+ for (i = 0, cptr = str; *cptr; i++) {
+ int count = strcspn(cptr, chars);
+ cptr += count;
+ if (*cptr)
+ ++cptr;
+ }
+
+ /* alloc the array */
+ if ((ptr = allocstr(str)) != NULL) {
+ if ((res = allocarray(++i)) == NULL)
+ free((void *)(uintptr_t)(const void *)str);
+ else {
+ /* now split the string */
+ i = 0;
+ while (*ptr) {
+ int count = strcspn(ptr, chars);
+ res[i++] = ptr;
+ ptr += count;
+ if (*ptr)
+ *ptr++ = '\0';
+ }
+ res[i] = NULL;
+ }
+ }
+
+ if (size)
+ *size = i;
+
+ return res;
+}
+
+
+/*
+ * login_close()
+ * Frees up all resources relating to a login class
+ *
+ */
+
+void
+login_close(login_cap_t * lc)
+{
+ if (lc) {
+ free(lc->lc_style);
+ free(lc->lc_class);
+ free(lc->lc_cap);
+ free(lc);
+ if (--lc_object_count == 0) {
+ free(internal_string);
+ free(internal_array);
+ internal_array = NULL;
+ internal_arraysz = 0;
+ internal_string = NULL;
+ internal_stringsz = 0;
+ cgetclose();
+ }
+ }
+}
+
+
+/*
+ * login_getclassbyname()
+ * Get the login class by its name.
+ * If the name given is NULL or empty, the default class
+ * LOGIN_DEFCLASS (i.e., "default") is fetched.
+ * If the name given is LOGIN_MECLASS and
+ * 'pwd' argument is non-NULL and contains an non-NULL
+ * dir entry, then the file _FILE_LOGIN_CONF is picked
+ * up from that directory and used before the system
+ * login database. In that case the system login database
+ * is looked up using LOGIN_MECLASS, too, which is a bug.
+ * Return a filled-out login_cap_t structure, including
+ * class name, and the capability record buffer.
+ */
+
+login_cap_t *
+login_getclassbyname(char const *name, const struct passwd *pwd)
+{
+ login_cap_t *lc;
+
+ if ((lc = malloc(sizeof(login_cap_t))) != NULL) {
+ int r, me, i = 0;
+ uid_t euid = 0;
+ gid_t egid = 0;
+ const char *msg = NULL;
+ const char *dir;
+ char userpath[MAXPATHLEN];
+
+ static char *login_dbarray[] = { NULL, NULL, NULL };
+
+ me = (name != NULL && strcmp(name, LOGIN_MECLASS) == 0);
+ dir = (!me || pwd == NULL) ? NULL : pwd->pw_dir;
+ /*
+ * Switch to user mode before checking/reading its ~/.login_conf
+ * - some NFSes have root read access disabled.
+ *
+ * XXX: This fails to configure additional groups.
+ */
+ if (dir) {
+ euid = geteuid();
+ egid = getegid();
+ (void)setegid(pwd->pw_gid);
+ (void)seteuid(pwd->pw_uid);
+ }
+
+ if (dir && snprintf(userpath, MAXPATHLEN, "%s/%s", dir,
+ _FILE_LOGIN_CONF) < MAXPATHLEN) {
+ if (_secure_path(userpath, pwd->pw_uid, pwd->pw_gid) != -1)
+ login_dbarray[i++] = userpath;
+ }
+ /*
+ * XXX: Why to add the system database if the class is `me'?
+ */
+ if (_secure_path(path_login_conf, 0, 0) != -1)
+ login_dbarray[i++] = path_login_conf;
+ login_dbarray[i] = NULL;
+
+ memset(lc, 0, sizeof(login_cap_t));
+ lc->lc_cap = lc->lc_class = lc->lc_style = NULL;
+
+ if (name == NULL || *name == '\0')
+ name = LOGIN_DEFCLASS;
+
+ switch (cgetent(&lc->lc_cap, login_dbarray, name)) {
+ case -1: /* Failed, entry does not exist */
+ if (me)
+ break; /* Don't retry default on 'me' */
+ if (i == 0)
+ r = -1;
+ else if ((r = open(login_dbarray[0], O_RDONLY | O_CLOEXEC)) >= 0)
+ close(r);
+ /*
+ * If there's at least one login class database,
+ * and we aren't searching for a default class
+ * then complain about a non-existent class.
+ */
+ if (r >= 0 || strcmp(name, LOGIN_DEFCLASS) != 0)
+ syslog(LOG_ERR, "login_getclass: unknown class '%s'", name);
+ /* fall-back to default class */
+ name = LOGIN_DEFCLASS;
+ msg = "%s: no default/fallback class '%s'";
+ if (cgetent(&lc->lc_cap, login_dbarray, name) != 0 && r >= 0)
+ break;
+ /* FALLTHROUGH - just return system defaults */
+ case 0: /* success! */
+ if ((lc->lc_class = strdup(name)) != NULL) {
+ if (dir) {
+ (void)seteuid(euid);
+ (void)setegid(egid);
+ }
+ ++lc_object_count;
+ return lc;
+ }
+ msg = "%s: strdup: %m";
+ break;
+ case -2:
+ msg = "%s: retrieving class information: %m";
+ break;
+ case -3:
+ msg = "%s: 'tc=' reference loop '%s'";
+ break;
+ case 1:
+ msg = "couldn't resolve 'tc=' reference in '%s'";
+ break;
+ default:
+ msg = "%s: unexpected cgetent() error '%s': %m";
+ break;
+ }
+ if (dir) {
+ (void)seteuid(euid);
+ (void)setegid(egid);
+ }
+ if (msg != NULL)
+ syslog(LOG_ERR, msg, "login_getclass", name);
+ free(lc);
+ }
+
+ return NULL;
+}
+
+
+
+/*
+ * login_getclass()
+ * Get the login class for the system (only) login class database.
+ * Return a filled-out login_cap_t structure, including
+ * class name, and the capability record buffer.
+ */
+
+login_cap_t *
+login_getclass(const char *cls)
+{
+ return login_getclassbyname(cls, NULL);
+}
+
+
+/*
+ * login_getpwclass()
+ * Get the login class for a given password entry from
+ * the system (only) login class database.
+ * If the password entry's class field is not set, or
+ * the class specified does not exist, then use the
+ * default of LOGIN_DEFCLASS (i.e., "default") for an unprivileged
+ * user or that of LOGIN_DEFROOTCLASS (i.e., "root") for a super-user.
+ * Return a filled-out login_cap_t structure, including
+ * class name, and the capability record buffer.
+ */
+
+login_cap_t *
+login_getpwclass(const struct passwd *pwd)
+{
+ const char *cls = NULL;
+
+ if (pwd != NULL) {
+ cls = pwd->pw_class;
+ if (cls == NULL || *cls == '\0')
+ cls = (pwd->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
+ }
+ /*
+ * XXX: pwd should be unused by login_getclassbyname() unless cls is `me',
+ * so NULL can be passed instead of pwd for more safety.
+ */
+ return login_getclassbyname(cls, pwd);
+}
+
+
+/*
+ * login_getuserclass()
+ * Get the `me' login class, allowing user overrides via ~/.login_conf.
+ * Note that user overrides are allowed only in the `me' class.
+ */
+
+login_cap_t *
+login_getuserclass(const struct passwd *pwd)
+{
+ return login_getclassbyname(LOGIN_MECLASS, pwd);
+}
+
+
+/*
+ * login_getcapstr()
+ * Given a login_cap entry, and a capability name, return the
+ * value defined for that capability, a default if not found, or
+ * an error string on error.
+ */
+
+const char *
+login_getcapstr(login_cap_t *lc, const char *cap, const char *def, const char *error)
+{
+ char *res;
+ int ret;
+
+ if (lc == NULL || cap == NULL || lc->lc_cap == NULL || *cap == '\0')
+ return def;
+
+ if ((ret = cgetstr(lc->lc_cap, cap, &res)) == -1)
+ return def;
+ return (ret >= 0) ? res : error;
+}
+
+
+/*
+ * login_getcaplist()
+ * Given a login_cap entry, and a capability name, return the
+ * value defined for that capability split into an array of
+ * strings.
+ */
+
+const char **
+login_getcaplist(login_cap_t *lc, const char *cap, const char *chars)
+{
+ const char *lstring;
+
+ if (chars == NULL)
+ chars = ", \t";
+ if ((lstring = login_getcapstr(lc, cap, NULL, NULL)) != NULL)
+ return arrayize(lstring, chars, NULL);
+ return NULL;
+}
+
+
+/*
+ * login_getpath()
+ * From the login_cap_t <lc>, get the capability <cap> which is
+ * formatted as either a space or comma delimited list of paths
+ * and append them all into a string and separate by semicolons.
+ * If there is an error of any kind, return <error>.
+ */
+
+const char *
+login_getpath(login_cap_t *lc, const char *cap, const char *error)
+{
+ const char *str;
+ char *ptr;
+ int count;
+
+ str = login_getcapstr(lc, cap, NULL, NULL);
+ if (str == NULL)
+ return error;
+ ptr = __DECONST(char *, str); /* XXXX Yes, very dodgy */
+ while (*ptr) {
+ count = strcspn(ptr, ", \t");
+ ptr += count;
+ if (*ptr)
+ *ptr++ = ':';
+ }
+ return str;
+}
+
+
+static int
+isinfinite(const char *s)
+{
+ static const char *infs[] = {
+ "infinity",
+ "inf",
+ "unlimited",
+ "unlimit",
+ "-1",
+ NULL
+ };
+ const char **i = &infs[0];
+
+ while (*i != NULL) {
+ if (strcasecmp(s, *i) == 0)
+ return 1;
+ ++i;
+ }
+ return 0;
+}
+
+
+static u_quad_t
+rmultiply(u_quad_t n1, u_quad_t n2)
+{
+ u_quad_t m, r;
+ int b1, b2;
+
+ static int bpw = 0;
+
+ /* Handle simple cases */
+ if (n1 == 0 || n2 == 0)
+ return 0;
+ if (n1 == 1)
+ return n2;
+ if (n2 == 1)
+ return n1;
+
+ /*
+ * sizeof() returns number of bytes needed for storage.
+ * This may be different from the actual number of useful bits.
+ */
+ if (!bpw) {
+ bpw = sizeof(u_quad_t) * 8;
+ while (((u_quad_t)1 << (bpw-1)) == 0)
+ --bpw;
+ }
+
+ /*
+ * First check the magnitude of each number. If the sum of the
+ * magnatude is way to high, reject the number. (If this test
+ * is not done then the first multiply below may overflow.)
+ */
+ for (b1 = bpw; (((u_quad_t)1 << (b1-1)) & n1) == 0; --b1)
+ ;
+ for (b2 = bpw; (((u_quad_t)1 << (b2-1)) & n2) == 0; --b2)
+ ;
+ if (b1 + b2 - 2 > bpw) {
+ errno = ERANGE;
+ return (UQUAD_MAX);
+ }
+
+ /*
+ * Decompose the multiplication to be:
+ * h1 = n1 & ~1
+ * h2 = n2 & ~1
+ * l1 = n1 & 1
+ * l2 = n2 & 1
+ * (h1 + l1) * (h2 + l2)
+ * (h1 * h2) + (h1 * l2) + (l1 * h2) + (l1 * l2)
+ *
+ * Since h1 && h2 do not have the low bit set, we can then say:
+ *
+ * (h1>>1 * h2>>1 * 4) + ...
+ *
+ * So if (h1>>1 * h2>>1) > (1<<(bpw - 2)) then the result will
+ * overflow.
+ *
+ * Finally, if MAX - ((h1 * l2) + (l1 * h2) + (l1 * l2)) < (h1*h2)
+ * then adding in residual amout will cause an overflow.
+ */
+
+ m = (n1 >> 1) * (n2 >> 1);
+ if (m >= ((u_quad_t)1 << (bpw-2))) {
+ errno = ERANGE;
+ return (UQUAD_MAX);
+ }
+ m *= 4;
+
+ r = (n1 & n2 & 1)
+ + (n2 & 1) * (n1 & ~(u_quad_t)1)
+ + (n1 & 1) * (n2 & ~(u_quad_t)1);
+
+ if ((u_quad_t)(m + r) < m) {
+ errno = ERANGE;
+ return (UQUAD_MAX);
+ }
+ m += r;
+
+ return (m);
+}
+
+
+/*
+ * login_getcaptime()
+ * From the login_cap_t <lc>, get the capability <cap>, which is
+ * formatted as a time (e.g., "<cap>=10h3m2s"). If <cap> is not
+ * present in <lc>, return <def>; if there is an error of some kind,
+ * return <error>.
+ */
+
+rlim_t
+login_getcaptime(login_cap_t *lc, const char *cap, rlim_t def, rlim_t error)
+{
+ char *res, *ep, *oval;
+ int r;
+ rlim_t tot;
+
+ errno = 0;
+ if (lc == NULL || lc->lc_cap == NULL)
+ return def;
+
+ /*
+ * Look for <cap> in lc_cap.
+ * If it's not there (-1), return <def>.
+ * If there's an error, return <error>.
+ */
+
+ if ((r = cgetstr(lc->lc_cap, cap, &res)) == -1)
+ return def;
+ else if (r < 0) {
+ errno = ERANGE;
+ return error;
+ }
+
+ /* "inf" and "infinity" are special cases */
+ if (isinfinite(res))
+ return RLIM_INFINITY;
+
+ /*
+ * Now go through the string, turning something like 1h2m3s into
+ * an integral value. Whee.
+ */
+
+ errno = 0;
+ tot = 0;
+ oval = res;
+ while (*res) {
+ rlim_t tim = strtoq(res, &ep, 0);
+ rlim_t mult = 1;
+
+ if (ep == NULL || ep == res || errno != 0) {
+ invalid:
+ syslog(LOG_WARNING, "login_getcaptime: class '%s' bad value %s=%s",
+ lc->lc_class, cap, oval);
+ errno = ERANGE;
+ return error;
+ }
+ /* Look for suffixes */
+ switch (*ep++) {
+ case 0:
+ ep--;
+ break; /* end of string */
+ case 's': case 'S': /* seconds */
+ break;
+ case 'm': case 'M': /* minutes */
+ mult = 60;
+ break;
+ case 'h': case 'H': /* hours */
+ mult = 60L * 60L;
+ break;
+ case 'd': case 'D': /* days */
+ mult = 60L * 60L * 24L;
+ break;
+ case 'w': case 'W': /* weeks */
+ mult = 60L * 60L * 24L * 7L;
+ break;
+ case 'y': case 'Y': /* 365-day years */
+ mult = 60L * 60L * 24L * 365L;
+ break;
+ default:
+ goto invalid;
+ }
+ res = ep;
+ tot += rmultiply(tim, mult);
+ if (errno)
+ goto invalid;
+ }
+
+ return tot;
+}
+
+
+/*
+ * login_getcapnum()
+ * From the login_cap_t <lc>, extract the numerical value <cap>.
+ * If it is not present, return <def> for a default, and return
+ * <error> if there is an error.
+ * Like login_getcaptime(), only it only converts to a number, not
+ * to a time; "infinity" and "inf" are 'special.'
+ */
+
+rlim_t
+login_getcapnum(login_cap_t *lc, const char *cap, rlim_t def, rlim_t error)
+{
+ char *ep, *res;
+ int r;
+ rlim_t val;
+
+ if (lc == NULL || lc->lc_cap == NULL)
+ return def;
+
+ /*
+ * For BSDI compatibility, try for the tag=<val> first
+ */
+ if ((r = cgetstr(lc->lc_cap, cap, &res)) == -1) {
+ long lval;
+ /* string capability not present, so try for tag#<val> as numeric */
+ if ((r = cgetnum(lc->lc_cap, cap, &lval)) == -1)
+ return def; /* Not there, so return default */
+ else if (r >= 0)
+ return (rlim_t)lval;
+ }
+
+ if (r < 0) {
+ errno = ERANGE;
+ return error;
+ }
+
+ if (isinfinite(res))
+ return RLIM_INFINITY;
+
+ errno = 0;
+ val = strtoq(res, &ep, 0);
+ if (ep == NULL || ep == res || errno != 0) {
+ syslog(LOG_WARNING, "login_getcapnum: class '%s' bad value %s=%s",
+ lc->lc_class, cap, res);
+ errno = ERANGE;
+ return error;
+ }
+
+ return val;
+}
+
+
+
+/*
+ * login_getcapsize()
+ * From the login_cap_t <lc>, extract the capability <cap>, which is
+ * formatted as a size (e.g., "<cap>=10M"); it can also be "infinity".
+ * If not present, return <def>, or <error> if there is an error of
+ * some sort.
+ */
+
+rlim_t
+login_getcapsize(login_cap_t *lc, const char *cap, rlim_t def, rlim_t error)
+{
+ char *ep, *res, *oval;
+ int r;
+ rlim_t tot;
+
+ if (lc == NULL || lc->lc_cap == NULL)
+ return def;
+
+ if ((r = cgetstr(lc->lc_cap, cap, &res)) == -1)
+ return def;
+ else if (r < 0) {
+ errno = ERANGE;
+ return error;
+ }
+
+ if (isinfinite(res))
+ return RLIM_INFINITY;
+
+ errno = 0;
+ tot = 0;
+ oval = res;
+ while (*res) {
+ rlim_t siz = strtoq(res, &ep, 0);
+ rlim_t mult = 1;
+
+ if (ep == NULL || ep == res || errno != 0) {
+ invalid:
+ syslog(LOG_WARNING, "login_getcapsize: class '%s' bad value %s=%s",
+ lc->lc_class, cap, oval);
+ errno = ERANGE;
+ return error;
+ }
+ switch (*ep++) {
+ case 0: /* end of string */
+ ep--;
+ break;
+ case 'b': case 'B': /* 512-byte blocks */
+ mult = 512;
+ break;
+ case 'k': case 'K': /* 1024-byte Kilobytes */
+ mult = 1024;
+ break;
+ case 'm': case 'M': /* 1024-k kbytes */
+ mult = 1024 * 1024;
+ break;
+ case 'g': case 'G': /* 1Gbyte */
+ mult = 1024 * 1024 * 1024;
+ break;
+ case 't': case 'T': /* 1TBte */
+ mult = 1024LL * 1024LL * 1024LL * 1024LL;
+ break;
+ default:
+ goto invalid;
+ }
+ res = ep;
+ tot += rmultiply(siz, mult);
+ if (errno)
+ goto invalid;
+ }
+
+ return tot;
+}
+
+
+/*
+ * login_getcapbool()
+ * From the login_cap_t <lc>, check for the existence of the capability
+ * of <cap>. Return <def> if <lc>->lc_cap is NULL, otherwise return
+ * the whether or not <cap> exists there.
+ */
+
+int
+login_getcapbool(login_cap_t *lc, const char *cap, int def)
+{
+ if (lc == NULL || lc->lc_cap == NULL)
+ return def;
+ return (cgetcap(lc->lc_cap, cap, ':') != NULL);
+}
+
+
+/*
+ * login_getstyle()
+ * Given a login_cap entry <lc>, and optionally a type of auth <auth>,
+ * and optionally a style <style>, find the style that best suits these
+ * rules:
+ * 1. If <auth> is non-null, look for an "auth-<auth>=" string
+ * in the capability; if not present, default to "auth=".
+ * 2. If there is no auth list found from (1), default to
+ * "passwd" as an authorization list.
+ * 3. If <style> is non-null, look for <style> in the list of
+ * authorization methods found from (2); if <style> is NULL, default
+ * to LOGIN_DEFSTYLE ("passwd").
+ * 4. If the chosen style is found in the chosen list of authorization
+ * methods, return that; otherwise, return NULL.
+ * E.g.:
+ * login_getstyle(lc, NULL, "ftp");
+ * login_getstyle(lc, "login", NULL);
+ * login_getstyle(lc, "skey", "network");
+ */
+
+const char *
+login_getstyle(login_cap_t *lc, const char *style, const char *auth)
+{
+ int i;
+ const char **authtypes = NULL;
+ char *auths= NULL;
+ char realauth[64];
+
+ static const char *defauthtypes[] = { LOGIN_DEFSTYLE, NULL };
+
+ if (auth != NULL && *auth != '\0') {
+ if (snprintf(realauth, sizeof realauth, "auth-%s", auth) < (int)sizeof(realauth))
+ authtypes = login_getcaplist(lc, realauth, NULL);
+ }
+
+ if (authtypes == NULL)
+ authtypes = login_getcaplist(lc, "auth", NULL);
+
+ if (authtypes == NULL)
+ authtypes = defauthtypes;
+
+ /*
+ * We have at least one authtype now; auths is a comma-separated
+ * (or space-separated) list of authentication types. We have to
+ * convert from this to an array of char*'s; authtypes then gets this.
+ */
+ i = 0;
+ if (style != NULL && *style != '\0') {
+ while (authtypes[i] != NULL && strcmp(style, authtypes[i]) != 0)
+ i++;
+ }
+
+ lc->lc_style = NULL;
+ if (authtypes[i] != NULL && (auths = strdup(authtypes[i])) != NULL)
+ lc->lc_style = auths;
+
+ if (lc->lc_style != NULL)
+ lc->lc_style = strdup(lc->lc_style);
+
+ return lc->lc_style;
+}