source: vendor/3.5.9/source4/param/util.c

/* 
   Unix SMB/CIFS implementation.
   Samba utility functions
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Jeremy Allison 2001-2002
   Copyright (C) Simo Sorce 2001
   Copyright (C) Jim McDonough (jmcd@us.ibm.com)  2003.
   Copyright (C) James J Myers 2003
   Copyright (C) Jelmer Vernooij 2005-2007
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "dynconfig/dynconfig.h"
#include "system/network.h"
#include "system/filesys.h"
#include "system/dir.h"
#include "param/param.h"

/**
 * @file
 * @brief Misc utility functions
 */


bool lp_is_mydomain(struct loadparm_context *lp_ctx, 
                             const char *domain)
{
        return strequal(lp_workgroup(lp_ctx), domain);
}

bool lp_is_my_domain_or_realm(struct loadparm_context *lp_ctx, 
                             const char *domain)
{
        return strequal(lp_workgroup(lp_ctx), domain) || 
                strequal(lp_realm(lp_ctx), domain);
}

/**
  see if a string matches either our primary or one of our secondary 
  netbios aliases. do a case insensitive match
*/
bool lp_is_myname(struct loadparm_context *lp_ctx, const char *name)
{
        const char **aliases;
        int i;

        if (strcasecmp(name, lp_netbios_name(lp_ctx)) == 0) {
                return true;
        }

        aliases = lp_netbios_aliases(lp_ctx);
        for (i=0; aliases && aliases[i]; i++) {
                if (strcasecmp(name, aliases[i]) == 0) {
                        return true;
                }
        }

        return false;
}


/**
 A useful function for returning a path in the Samba lock directory.
**/
char *lock_path(TALLOC_CTX* mem_ctx, struct loadparm_context *lp_ctx,
                         const char *name)
{
        char *fname, *dname;
        if (name == NULL) {
                return NULL;
        }
        if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) {
                return talloc_strdup(mem_ctx, name);
        }

        dname = talloc_strdup(mem_ctx, lp_lockdir(lp_ctx));
        trim_string(dname,"","/");
        
        if (!directory_exist(dname)) {
                mkdir(dname,0755);
        }
        
        fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);

        talloc_free(dname);

        return fname;
}

/**
 * @brief Returns an absolute path to a file in the directory containing the current config file
 *
 * @param name File to find, relative to the config file directory.
 *
 * @retval Pointer to a talloc'ed string containing the full path.
 **/

char *config_path(TALLOC_CTX* mem_ctx, struct loadparm_context *lp_ctx,
                           const char *name)
{
        char *fname, *config_dir, *p;
        config_dir = talloc_strdup(mem_ctx, lp_configfile(lp_ctx));
        if (config_dir == NULL) {
                config_dir = talloc_strdup(mem_ctx, lp_default_path());
        }
        p = strrchr(config_dir, '/');
        if (p == NULL) {
                talloc_free(config_dir);
                config_dir = talloc_strdup(mem_ctx, ".");
                if (config_dir == NULL) {
                        return NULL;
                }
        } else {
                p[0] = '\0';
        }
        fname = talloc_asprintf(mem_ctx, "%s/%s", config_dir, name);
        talloc_free(config_dir);
        return fname;
}

/**
 * @brief Returns an absolute path to a file in the Samba private directory.
 *
 * @param name File to find, relative to PRIVATEDIR.
 * if name is not relative, then use it as-is
 *
 * @retval Pointer to a talloc'ed string containing the full path.
 **/
char *private_path(TALLOC_CTX* mem_ctx, 
                            struct loadparm_context *lp_ctx,
                            const char *name)
{
        char *fname;
        if (name == NULL) {
                return NULL;
        }
        if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) {
                return talloc_strdup(mem_ctx, name);
        }
        fname = talloc_asprintf(mem_ctx, "%s/%s", lp_private_dir(lp_ctx), name);
        return fname;
}

/**
  return a path in the smbd.tmp directory, where all temporary file
  for smbd go. If NULL is passed for name then return the directory 
  path itself
*/
char *smbd_tmp_path(TALLOC_CTX *mem_ctx, 
                             struct loadparm_context *lp_ctx, 
                             const char *name)
{
        char *fname, *dname;

        dname = private_path(mem_ctx, lp_ctx, "smbd.tmp");
        if (!directory_exist(dname)) {
                mkdir(dname,0755);
        }

        if (name == NULL) {
                return dname;
        }

        fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
        talloc_free(dname);

        return fname;
}

/**
 * Obtain the init function from a shared library file
 */
init_module_fn load_module(TALLOC_CTX *mem_ctx, const char *path)
{
        void *handle;
        void *init_fn;

        handle = dlopen(path, RTLD_NOW);
        if (handle == NULL) {
                DEBUG(0, ("Unable to open %s: %s\n", path, dlerror()));
                return NULL;
        }

        init_fn = dlsym(handle, SAMBA_INIT_MODULE);

        if (init_fn == NULL) {
                DEBUG(0, ("Unable to find %s() in %s: %s\n", 
                          SAMBA_INIT_MODULE, path, dlerror()));
                DEBUG(1, ("Loading module '%s' failed\n", path));
                dlclose(handle);
                return NULL;
        }

        return (init_module_fn)init_fn;
}

/**
 * Obtain list of init functions from the modules in the specified
 * directory
 */
init_module_fn *load_modules(TALLOC_CTX *mem_ctx, const char *path)
{
        DIR *dir;
        struct dirent *entry;
        char *filename;
        int success = 0;
        init_module_fn *ret = talloc_array(mem_ctx, init_module_fn, 2);

        ret[0] = NULL;
        
        dir = opendir(path);
        if (dir == NULL) {
                talloc_free(ret);
                return NULL;
        }

        while((entry = readdir(dir))) {
                if (ISDOT(entry->d_name) || ISDOTDOT(entry->d_name))
                        continue;

                filename = talloc_asprintf(mem_ctx, "%s/%s", path, entry->d_name);

                ret[success] = load_module(mem_ctx, filename);
                if (ret[success]) {
                        ret = talloc_realloc(mem_ctx, ret, init_module_fn, success+2);
                        success++;
                        ret[success] = NULL;
                }

                talloc_free(filename);
        }

        closedir(dir);

        return ret;
}

/**
 * Run the specified init functions.
 *
 * @return true if all functions ran successfully, false otherwise
 */
bool run_init_functions(init_module_fn *fns)
{
        int i;
        bool ret = true;
        
        if (fns == NULL)
                return true;
        
        for (i = 0; fns[i]; i++) { ret &= (bool)NT_STATUS_IS_OK(fns[i]()); }

        return ret;
}

static char *modules_path(TALLOC_CTX* mem_ctx, struct loadparm_context *lp_ctx,
                          const char *name)
{
        const char *env_moduledir = getenv("LD_SAMBA_MODULE_PATH");
        return talloc_asprintf(mem_ctx, "%s/%s", 
                               env_moduledir?env_moduledir:lp_modulesdir(lp_ctx), 
                               name);
}

/**
 * Load the initialization functions from DSO files for a specific subsystem.
 *
 * Will return an array of function pointers to initialization functions
 */

init_module_fn *load_samba_modules(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx, const char *subsystem)
{
        char *path = modules_path(mem_ctx, lp_ctx, subsystem);
        init_module_fn *ret;

        ret = load_modules(mem_ctx, path);

        talloc_free(path);

        return ret;
}

const char *lp_messaging_path(TALLOC_CTX *mem_ctx, 
                                       struct loadparm_context *lp_ctx)
{
        return smbd_tmp_path(mem_ctx, lp_ctx, "messaging");
}

struct smb_iconv_convenience *smb_iconv_convenience_init_lp(TALLOC_CTX *mem_ctx,
                                                         struct loadparm_context *lp_ctx)
{
        return smb_iconv_convenience_init(mem_ctx, lp_dos_charset(lp_ctx),
                                          lp_unix_charset(lp_ctx),
                lp_parm_bool(lp_ctx, NULL, "iconv", "native", true));
}


const char *lp_sam_name(struct loadparm_context *lp_ctx) 
{
        switch (lp_server_role(lp_ctx)) {
        case ROLE_DOMAIN_CONTROLLER:
                return lp_workgroup(lp_ctx);
        default:
                return lp_netbios_name(lp_ctx);
        }
}