re_group.c

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/*
 * $Id$ 
 *
 * Copyright (C) 2005-2007 Voice Sistem SRL
 *
 * 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:
 * --------
 *  2005-10-06 - created by bogdan
 */

#include <sys/types.h>
#include <regex.h>

#include "../../str.h"
#include "../../mem/mem.h"
#include "../../route_struct.h"
#include "../../lvalue.h"
#include "group_mod.h"
#include "re_group.h"
#include "group.h"

struct re_grp {
        regex_t       re;
        int_str       gid;
        struct re_grp *next;
};

static struct re_grp *re_list = 0;


static int add_re(const char *re, int gid)
{
        struct re_grp *rg;

        LM_DBG("adding <%s> with %d\n",re, gid);

        rg = (struct re_grp*)pkg_malloc(sizeof(struct re_grp));
        if (rg==0) {
                LM_ERR("no more pkg mem\n");
                goto error;
        }
        memset( rg, 0, sizeof(struct re_grp));

        if (regcomp(&rg->re, re, REG_EXTENDED|REG_ICASE|REG_NEWLINE) ) {
                LM_ERR("bad re %s\n", re);
                pkg_free(rg);
                goto error;
        }

        rg->gid.n = gid;

        rg->next = re_list;
        re_list = rg;

        return 0;
error:
        return -1;
}


int load_re( str *table )
{
        db_key_t cols[2];
        db1_res_t* res = NULL;
        db_row_t* row;
        int n;

        cols[0] = &re_exp_column;
        cols[1] = &re_gid_column;

        if (group_dbf.use_table(group_dbh, table) < 0) {
                LM_ERR("failed to set table <%s>\n", table->s);
                goto error;
        }

        if (group_dbf.query(group_dbh, 0, 0, 0, cols, 0, 2, 0, &res) < 0) {
                LM_ERR("failed to query database\n");
                goto error;
        }

        for( n=0 ; n<RES_ROW_N(res) ; n++) {
                row = &res->rows[n];
                /* validate row */
                if (row->values[0].nul || row->values[0].type!=DB1_STRING) {
                        LM_ERR("empty or non-string "
                                "value for <%s>(re) column\n",re_exp_column.s);
                        goto error1;
                }
                if (row->values[1].nul || row->values[1].type!=DB1_INT) {
                        LM_ERR("empty or non-integer "
                                "value for <%s>(gid) column\n",re_gid_column.s);
                        goto error1;
                }

                if ( add_re( row->values[0].val.string_val,
                row->values[1].val.int_val)!=0 ) {
                        LM_ERR("failed to add row\n");
                        goto error1;
                }
        }
        LM_DBG("%d rules were loaded\n", n);

        group_dbf.free_result(group_dbh, res);
        return 0;
error1:
        group_dbf.free_result(group_dbh, res);
error:
        return -1;
}


int get_user_group(struct sip_msg *req, char *user, char *avp)
{
        static char uri_buf[MAX_URI_SIZE];
        str  username;
        str  domain;
        pv_spec_t *pvs;
        pv_value_t val;
        struct re_grp *rg;
        regmatch_t pmatch;
        char *c;
        int n;
        int* pi;

        if (get_username_domain( req, (group_check_p)user, &username, &domain)!=0){
                LM_ERR("failed to get username@domain\n");
                goto error;
        }

        if (username.s==NULL || username.len==0 ) {
                LM_DBG("no username part\n");
                return -1;
        }

        if ( 4 + username.len + 1 + domain.len + 1 > MAX_URI_SIZE ) {
                LM_ERR("URI to large!!\n");
                goto error;
        }

        pi=(int*)uri_buf;
        *pi = htonl(('s'<<24) + ('i'<<16) + ('p'<<8) + ':');
        c = uri_buf + 4;
        memcpy( c, username.s, username.len);
        c += username.len;
        *(c++) = '@';
        memcpy( c, domain.s, domain.len);
        c += domain.len;
        *c = 0;

        LM_DBG("getting groups for <%s>\n",uri_buf);
        pvs = (pv_spec_t*)avp;
        memset(&val, 0, sizeof(pv_value_t));
        val.flags = PV_VAL_INT|PV_TYPE_INT;

        /* check against all re groups */
        for( rg=re_list,n=0 ; rg ; rg=rg->next ) {
                if (regexec( &rg->re, uri_buf, 1, &pmatch, 0)==0) {
                        LM_DBG("user matched to group %d!\n", rg->gid.n);

                        /* match -> add the gid as AVP */
                        val.ri = rg->gid.n;
                        if(pvs->setf(req, &pvs->pvp, (int)EQ_T, &val)<0)
                        {
                                LM_ERR("setting PV AVP failed\n");
                                goto error;
                        }
                        n++;
                        /* continue? */
                        if (multiple_gid==0)
                                break;
                }
        }

        return n?n:-1;
error:
        return -1;
}