ldap_mod.c

/*
 * $Id$
 *
 * Kamailio LDAP Module
 *
 * Copyright (C) 2007 University of North Carolina
 *
 * Original author: Christian Schlatter, cs@unc.edu
 *
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio 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 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * History:
 * --------
 * 2007-02-18: Initial version
 */


#include <stdio.h>
#include <string.h>
#include <sys/time.h>

#include "../../ut.h"
#include "../../parser/hf.h"
#include "../../sr_module.h"
#include "../../pvar.h"
#include "../../mem/mem.h"

#include "ld_session.h"
#include "ldap_exp_fn.h"
#include "api.h"
#include "ldap_connect.h"
#include "ldap_api_fn.h"
#include "iniparser.h"

MODULE_VERSION

/*
* Module management function prototypes
*/
static int mod_init(void);
static void destroy(void);
static int child_init(int rank);

/*
* fixup functions
*/
static int ldap_search_fixup(void** param, int param_no);
static int ldap_result_fixup(void** param, int param_no);
static int ldap_filter_url_encode_fixup(void** param, int param_no);
static int ldap_result_check_fixup(void** param, int param_no);

/*
* exported functions
*/

static int w_ldap_search(struct sip_msg* msg, char* ldap_url, char* param);
static int w_ldap_result1(struct sip_msg* msg, char* src, char* param);
static int w_ldap_result2(struct sip_msg* msg, char* src, char* subst);
static int w_ldap_result_next(struct sip_msg* msg, char* foo, char *bar);
static int w_ldap_filter_url_encode(struct sip_msg* msg, 
                char* filter_component, char* dst_avp_name);
static int w_ldap_result_check_1(struct sip_msg* msg, 
                char* attr_name_check_str, char* param);
static int w_ldap_result_check_2(struct sip_msg* msg,
                char* attr_name_check_str, char* attr_val_re);


/* 
* Default module parameter values 
*/
#define DEF_LDAP_CONFIG "/usr/local/etc/kamailio/ldap.cfg"

/*
* Module parameter variables
*/
str ldap_config = str_init(DEF_LDAP_CONFIG);
static dictionary* config_vals = NULL;

/*
* Exported functions
*/
static cmd_export_t cmds[] = {
        {"ldap_search",            (cmd_function)w_ldap_search,            1, 
                ldap_search_fixup, 0,
                REQUEST_ROUTE|FAILURE_ROUTE|BRANCH_ROUTE|ONREPLY_ROUTE|LOCAL_ROUTE},
        {"ldap_result",            (cmd_function)w_ldap_result1,           1, 
                ldap_result_fixup, 0,
                REQUEST_ROUTE|FAILURE_ROUTE|BRANCH_ROUTE|ONREPLY_ROUTE|LOCAL_ROUTE},
        {"ldap_result",            (cmd_function)w_ldap_result2,           2, 
                ldap_result_fixup, 0,
                REQUEST_ROUTE|FAILURE_ROUTE|BRANCH_ROUTE|ONREPLY_ROUTE|LOCAL_ROUTE},
        {"ldap_result_next",       (cmd_function)w_ldap_result_next,       0, 
                0, 0,
                REQUEST_ROUTE|FAILURE_ROUTE|BRANCH_ROUTE|ONREPLY_ROUTE|LOCAL_ROUTE},
        {"ldap_result_check",      (cmd_function)w_ldap_result_check_1,    1, 
                ldap_result_check_fixup, 0,
                REQUEST_ROUTE|FAILURE_ROUTE|BRANCH_ROUTE|ONREPLY_ROUTE|LOCAL_ROUTE},
        {"ldap_result_check",      (cmd_function)w_ldap_result_check_2,    2, 
                ldap_result_check_fixup, 0,
                REQUEST_ROUTE|FAILURE_ROUTE|BRANCH_ROUTE|ONREPLY_ROUTE|LOCAL_ROUTE},
        {"ldap_filter_url_encode", (cmd_function)w_ldap_filter_url_encode, 2, 
                ldap_filter_url_encode_fixup, 0,
                REQUEST_ROUTE|FAILURE_ROUTE|BRANCH_ROUTE|ONREPLY_ROUTE|LOCAL_ROUTE},
        {"load_ldap",              (cmd_function)load_ldap,  0,
                0, 0,
                0},
        {0, 0, 0, 0, 0, 0}
};


/*
* Exported parameters
*/
static param_export_t params[] = {

        {"config_file",          STR_PARAM, &ldap_config},
        {0, 0, 0}
};


/*
* Module interface
*/
struct module_exports exports = {
        "ldap", 
        DEFAULT_DLFLAGS, /* dlopen flags */
        cmds,       /* Exported functions */
        params,     /* Exported parameters */
        0,          /* exported statistics */
        0,          /* exported MI functions */
        0,          /* exported pseudo-variables */
        0,          /* extra processes */
        mod_init,   /* module initialization function */
        0,          /* response function */
        destroy,    /* destroy function */
        child_init  /* child initialization function */
};


static int child_init(int rank)
{
        int i = 0, ld_count = 0;
        char* ld_name;
        
        /* don't do anything for non-worker processes */
        if (rank==PROC_INIT || rank==PROC_MAIN || rank==PROC_TCP_MAIN)
                return 0;

        /*
        * build ld_sessions and connect all sessions
        */
        ld_count = iniparser_getnsec(config_vals);
        for (i = 0; i < ld_count; i++)
        {
                ld_name = iniparser_getsecname(config_vals, i);
                if (add_ld_session(ld_name,
                                        NULL,
                                        config_vals)
                                != 0)
                {
                        LM_ERR("[%s]: add_ld_session failed\n", ld_name);
                        return -1;
                }

                if (ldap_connect(ld_name) != 0)
                {
                        LM_ERR("[%s]: failed to connect to LDAP host(s)\n", ld_name);
                        ldap_disconnect(ld_name);
                        return -1;
                }
                
        }
        
        return 0;
}


static int mod_init(void)
{
        int ld_count = 0, i = 0;
        char* section_name;
        char* ldap_version;
        
        /*
        * read config file
        */
        if (strlen(ldap_config.s) == 0)
        {
                LM_ERR("config_file is empty - this module param is mandatory\n");
                return -2;
        }
        if ((config_vals = iniparser_new(ldap_config.s)) == NULL)
        {
                LM_ERR("failed to read config_file [%s]\n", ldap_config.s);
                return -2;
        }
        if ((ld_count = iniparser_getnsec(config_vals)) < 1)
        {
                LM_ERR("no section found in config_file [%s]\n", ldap_config.s);
                return -2;
        }
        /* check if mandatory settings are present */
        for (i = 0; i < ld_count; i++)
        {
                section_name = iniparser_getsecname(config_vals, i);
                if (strlen(section_name) > 255)
                {
                        LM_ERR( "config_file section name [%s]"
                                " longer than allowed 255 characters",
                                section_name);
                        return -2;
                }
                if (!iniparser_find_entry(config_vals,
                                        get_ini_key_name(section_name, CFG_N_LDAP_HOST)))
                {
                        LM_ERR( "mandatory %s not defined in [%s]\n", 
                                CFG_N_LDAP_HOST, 
                                section_name);
                        return -2;
                }
        }       
        
        /*
        * print ldap version string
        */
        if (ldap_get_vendor_version(&ldap_version) != 0)
        {
                LM_ERR("ldap_get_vendor_version failed\n");
                return -2;
        }
        LM_INFO("%s\n", ldap_version);

        return 0;
}


static void destroy(void)
{
        /* ldap_unbind */
        free_ld_sessions();

        /* free config file memory */
        iniparser_free(config_vals);
}


/*
* EXPORTED functions
*/

static int w_ldap_search(struct sip_msg* msg, char* ldap_url, char* param)
{
        return ldap_search_impl(msg, (pv_elem_t*)ldap_url);
}

static int w_ldap_result1(struct sip_msg* msg, char* src, char* param)
{
        return ldap_write_result(msg, (struct ldap_result_params*)src, NULL);
}

static int w_ldap_result2(struct sip_msg* msg, char* src, char* subst)
{
        return ldap_write_result(msg, (struct ldap_result_params*)src,
                        (struct subst_expr*)subst);
}

static int w_ldap_result_next(struct sip_msg* msg, char* foo, char *bar)
{
        return ldap_result_next();
}

static int w_ldap_filter_url_encode(struct sip_msg* msg,
                char* filter_component, char* dst_avp_name)
{
        return ldap_filter_url_encode(msg, (pv_elem_t*)filter_component,
                        (pv_spec_t*)dst_avp_name);
}

static int w_ldap_result_check_1(struct sip_msg* msg,
                char* attr_name_check_str, char* param)
{
        return ldap_result_check(msg,
                        (struct ldap_result_check_params*)attr_name_check_str, NULL);
}

static int w_ldap_result_check_2(struct sip_msg* msg,
                char* attr_name_check_str, char* attr_val_re)
{
        return ldap_result_check( msg, 
                (struct ldap_result_check_params*)attr_name_check_str, 
                (struct subst_expr*)attr_val_re);
}

/*
* FIXUP functions
*/

static int ldap_search_fixup(void** param, int param_no)
{
        pv_elem_t *model;
        str s;

        if (param_no == 1) {
                s.s = (char*)*param;
                s.len = strlen(s.s);
                if (s.len==0) {
                        LM_ERR("ldap url is empty string!\n");
                        return E_CFG;
                }
                if ( pv_parse_format(&s,&model) || model==NULL) {
                        LM_ERR("wrong format [%s] for ldap url!\n", s.s);
                        return E_CFG;
                }
                *param = (void*)model;
        }

        return 0;
}

static int ldap_result_fixup(void** param, int param_no)
{
        struct ldap_result_params* lp;
        struct subst_expr* se;
        str subst;
        char *arg_str, *dst_avp_str, *dst_avp_val_type_str;
        char *p;
        str s;
        int dst_avp_val_type = 0;
        
        if (param_no == 1) {
                arg_str = (char*)*param;
                if ((dst_avp_str = strchr(arg_str, '/')) == 0) 
                {
                        /* no / found in arg_str */
                        LM_ERR("invalid first argument [%s]\n", arg_str);
                        return E_UNSPEC;
                }
                *(dst_avp_str++) = 0;

                if ((dst_avp_val_type_str = strchr(dst_avp_str, '/')))
                {
                        *(dst_avp_val_type_str++) = 0;
                        if (!strcmp(dst_avp_val_type_str, "int"))
                        {
                                dst_avp_val_type = 1;
                        }
                        else if (strcmp(dst_avp_val_type_str, "str"))
                        {
                                LM_ERR( "invalid avp_type [%s]\n",
                                        dst_avp_val_type_str);
                                return E_UNSPEC;
                        }
                }

                lp = (struct ldap_result_params*)pkg_malloc(sizeof(struct ldap_result_params));
                if (lp == NULL) {
                        LM_ERR("no memory\n");
                        return E_OUT_OF_MEM;
                }
                memset(lp, 0, sizeof(struct ldap_result_params));
                
                lp->ldap_attr_name.s = arg_str;
                lp->ldap_attr_name.len = strlen(arg_str);

                lp->dst_avp_val_type = dst_avp_val_type;
                s.s = dst_avp_str; s.len = strlen(s.s);
                p = pv_parse_spec(&s, &lp->dst_avp_spec);
                if (p == 0) {
                        pkg_free(lp);
                        LM_ERR("parse error for [%s]\n",
                                        dst_avp_str);
                        return E_UNSPEC;
                }
                if (lp->dst_avp_spec.type != PVT_AVP) {
                        pkg_free(lp);
                        LM_ERR( "bad attribute name [%s]\n",
                                dst_avp_str);
                        return E_UNSPEC;
                }
                *param = (void*)lp;
                
        } else if (param_no == 2) {
                subst.s = *param;
                subst.len = strlen(*param);
                se = subst_parser(&subst);
                if (se == 0) {
                        LM_ERR("bad subst re [%s]\n",
                        (char*)*param);
                        return E_BAD_RE;
                }
                *param = (void*)se;
        }

        return 0;
}

static int ldap_result_check_fixup(void** param, int param_no)
{
        struct ldap_result_check_params *lp;
        struct subst_expr *se;
        str subst;
        str s;
        char *arg_str, *check_str;
        int arg_str_len;
        
        if (param_no == 1)
        {
                arg_str = (char*)*param;
                arg_str_len = strlen(arg_str);
                if ((check_str = strchr(arg_str, '/')) == 0)
                {
                        /* no / found in arg_str */
                        LM_ERR( "invalid first argument [%s] (no '/' found)\n",
                                arg_str);
                        return E_UNSPEC;
                }
                *(check_str++) = 0;
                
                lp = (struct ldap_result_check_params*)pkg_malloc(sizeof(struct ldap_result_check_params));
                if (lp == NULL) {
                        LM_ERR("no memory\n");
                        return E_OUT_OF_MEM;
                }
                memset(lp, 0, sizeof(struct ldap_result_check_params));

                lp->ldap_attr_name.s = arg_str;
                lp->ldap_attr_name.len = strlen(arg_str);

                if (lp->ldap_attr_name.len + 1 == arg_str_len)
                {
                        /* empty check_str */
                        lp->check_str_elem_p = 0;
                }
                else
                {
                        s.s = check_str; s.len = strlen(s.s);
                        if (pv_parse_format(&s, &(lp->check_str_elem_p)) < 0)
                        {
                                LM_ERR("pv_parse_format failed\n");
                                return E_OUT_OF_MEM;
                        }
                }       
                *param = (void*)lp;
        }
        else if (param_no == 2)
        {
                subst.s = *param;
                subst.len = strlen(*param);
                se = subst_parser(&subst);
                if (se == 0) {
                        LM_ERR( "bad subst re [%s]\n",
                                (char*)*param);
                        return E_BAD_RE;
                }
                *param = (void*)se;
        }

        return 0;       
}

static int ldap_filter_url_encode_fixup(void** param, int param_no)
{
        pv_elem_t *elem_p;
        pv_spec_t *spec_p;
        str s;

        if (param_no == 1) {
                s.s = (char*)*param;
                if (s.s==0 || s.s[0]==0) {
                        elem_p = 0;
                } else {
                        s.len = strlen(s.s);
                        if (pv_parse_format(&s, &elem_p) < 0) {
                                LM_ERR("pv_parse_format failed\n");
                                return E_OUT_OF_MEM;
                        }
                }
                *param = (void*)elem_p;
        }
        else if (param_no == 2)
        {
                spec_p = (pv_spec_t*)pkg_malloc(sizeof(pv_spec_t));
                if (spec_p == NULL) {
                        LM_ERR("no memory\n");
                        return E_OUT_OF_MEM;
                }
                s.s = (char*)*param; s.len = strlen(s.s);
                if (pv_parse_spec(&s, spec_p)
                                == 0)
                {
                        pkg_free(spec_p);
                        LM_ERR("parse error for [%s]\n",
                                (char*)*param);
                        return E_UNSPEC;
                }
                if (spec_p->type != PVT_AVP) {
                        pkg_free(spec_p);
                        LM_ERR("bad attribute name"
                                " [%s]\n", (char*)*param);
                        return E_UNSPEC;
                }
                *param = (void*)spec_p;
        }

        return 0;
}