modules_k/cpl-c/cpl.c

/*
 * $Id$
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * 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:
 * -------
 * 2003-03-11: New module interface (janakj)
 * 2003-03-16: flags export parameter added (janakj)
 * 2003-11-11: build_lump_rpl() removed, add_lump_rpl() has flags (bogdan)
 * 2004-06-06  updated to the new DB api (andrei)
 * 2004-06-14: all global variables merged into cpl_env and cpl_fct;
 *             case_sensitive and realm_prefix added for building AORs - see
 *             build_userhost (bogdan)
 * 2004-10-09: added process_register_norpl to allow register processing 
 *             without sending the reply(bogdan) - based on a patch sent by
 *             Christopher Crawford
 */


#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>

#include "../../mem/shm_mem.h"
#include "../../mem/mem.h"
#include "../../sr_module.h"
#include "../../str.h"
#include "../../ut.h"
#include "../../dprint.h"
#include "../../data_lump_rpl.h"
#include "../../pvar.h"
#include "../../parser/parse_uri.h"
#include "../../parser/parse_from.h"
#include "../../parser/parse_content.h"
#include "../../parser/parse_disposition.h"
#include "../../lib/srdb1/db.h"
#include "../../lib/kmi/mi.h"
#include "../../modules/sl/sl.h"
#include "cpl_run.h"
#include "cpl_env.h"
#include "cpl_db.h"
#include "cpl_loader.h"
#include "cpl_parser.h"
#include "cpl_nonsig.h"
#include "loc_set.h"


#define MAX_PROXY_RECURSE  10
#define MAX_USERHOST_LEN    256


/* modules param variables */
static str db_url           = str_init(DEFAULT_DB_URL); /* database url */
static str db_table        = str_init("cpl");  /* database table */
static char *dtd_file      = 0;  /* name of the DTD file for CPL parser */
static char *lookup_domain = 0;
static str  timer_avp      = {NULL, 0};  /* name of variable timer AVP */


struct cpl_enviroment    cpl_env = {
                0, /* no cpl logging */
                0, /* recurse proxy level is 0 */
                0, /* no script route to be run before proxy */
                0, /* user part is not case sensitive */
                {0,0},   /* no domain prefix to be ignored */
                {-1,-1}, /* communication pipe to aux_process */
                {0,0},   /* original TZ \0 terminated "TZ=value" format */
                0,   /* udomain */
                0,   /* no branches on lookup */
                0,   /* timer avp type */
                {0}, /* timer avp name/ID */
                0    /* use_domain */
};

struct cpl_functions  cpl_fct;
static str cpl_ok_rpl = str_init("OK");


MODULE_VERSION


static int cpl_invoke_script (struct sip_msg* msg, char* str, char* str2);
static int w_process_register(struct sip_msg* msg, char* str, char* str2);
static int w_process_register_norpl(struct sip_msg* msg, char* str,char* str2);
static int cpl_process_register(struct sip_msg* msg, int no_rpl);
static int fixup_cpl_run_script(void** param, int param_no);
static int cpl_init(void);
static int mi_child_init(void);
static int cpl_child_init(int rank);
static int cpl_exit(void);
static void cpl_process(int rank);


/*
 * Exported processes
 */
static proc_export_t cpl_procs[] = {
        {"CPL Aux",  0,  0,  cpl_process, 1 },
        {0,0,0,0,0}
};


/*
 * Exported functions
 */
static cmd_export_t cmds[] = {
        {"cpl_run_script",            (cmd_function)cpl_invoke_script,        2,
                        fixup_cpl_run_script, 0, REQUEST_ROUTE},
        {"cpl_process_register",      (cmd_function)w_process_register,       0,
                        0, 0,                    REQUEST_ROUTE},
        {"cpl_process_register_norpl",(cmd_function)w_process_register_norpl, 0,
                        0, 0,                    REQUEST_ROUTE},
        {0, 0, 0, 0, 0, 0}
};


/*
 * Exported parameters
 */
static param_export_t params[] = {
        {"db_url",         STR_PARAM, &db_url.s                          },
        {"db_table",       STR_PARAM, &db_table.s                        },
        {"cpl_dtd_file",   STR_PARAM, &dtd_file                          },
        {"proxy_recurse",  INT_PARAM, &cpl_env.proxy_recurse             },
        {"proxy_route",    INT_PARAM, &cpl_env.proxy_route               },
        {"log_dir",        STR_PARAM, &cpl_env.log_dir                   },
        {"case_sensitive", INT_PARAM, &cpl_env.case_sensitive            },
        {"realm_prefix",   STR_PARAM, &cpl_env.realm_prefix.s            },
        {"lookup_domain",  STR_PARAM, &lookup_domain                     },
        {"lookup_append_branches", INT_PARAM, &cpl_env.lu_append_branches},
        {"timer_avp",      STR_PARAM, &timer_avp.s                       },
        {"username_column",STR_PARAM, &cpl_username_col                  },
        {"domain_column",  STR_PARAM, &cpl_domain_col                    },
        {"cpl_xml_column", STR_PARAM, &cpl_xml_col                       },
        {"cpl_bin_column", STR_PARAM, &cpl_bin_col                       },
        {"use_domain",     INT_PARAM, &cpl_env.use_domain                },
        {0, 0, 0}
};


/*
 * Exported MI functions
 */
static mi_export_t mi_cmds[] = {
        { "LOAD_CPL",   mi_cpl_load,     0,  0,  mi_child_init },
        { "REMOVE_CPL", mi_cpl_remove,   0,  0,  0             },
        { "GET_CPL",    mi_cpl_get,      0,  0,  0             },
        { 0, 0, 0, 0, 0}
};




struct module_exports exports = {
        "cpl-c",
        DEFAULT_DLFLAGS, /* dlopen flags */
        cmds,     /* Exported functions */
        params,   /* Exported parameters */
        0,        /* exported statistics */
        mi_cmds,  /* exported MI functions */
        0,        /* exported pseudo-variables */
        cpl_procs,/* extra processes */
        cpl_init, /* Module initialization function */
        0,
        (destroy_function) cpl_exit,
        (child_init_function) cpl_child_init /* per-child init function */
};



static int fixup_cpl_run_script(void** param, int param_no)
{
        long flag;

        if (param_no==1) {
                if (!strcasecmp( "incoming", *param))
                        flag = CPL_RUN_INCOMING;
                else if (!strcasecmp( "outgoing", *param))
                        flag = CPL_RUN_OUTGOING;
                else {
                        LM_ERR("script directive \"%s\" unknown!\n",(char*)*param);
                        return E_UNSPEC;
                }
                pkg_free(*param);
                *param=(void*)flag;
                return 0;
        } else if (param_no==2) {
                if ( !strcasecmp("is_stateless", *param) ) {
                        flag = 0;
                } else if ( !strcasecmp("is_stateful", *param) ) {
                        flag = CPL_IS_STATEFUL;
                } else if ( !strcasecmp("force_stateful", *param) ) {
                        flag = CPL_FORCE_STATEFUL;
                } else {
                        LM_ERR("flag \"%s\" (second param) unknown!\n",(char*)*param);
                        return E_UNSPEC;
                }
                pkg_free(*param);
                *param=(void*)flag;
        }
        return 0;
}



static int cpl_init(void)
{
        bind_usrloc_t bind_usrloc;
        struct stat   stat_t;
        char *ptr;
        int val;
        pv_spec_t avp_spec;
        unsigned short avp_type;

        if(register_mi_mod(exports.name, mi_cmds)!=0)
        {
                LM_ERR("failed to register MI commands\n");
                return -1;
        }

        db_url.len = strlen(db_url.s);
        db_table.len = strlen(db_table.s);
        if (timer_avp.s) timer_avp.len = strlen(timer_avp.s);

        if (cpl_env.proxy_recurse>MAX_PROXY_RECURSE) {
                LM_CRIT("value of proxy_recurse param (%d) exceeds "
                        "the maximum safety value (%d)\n",
                        cpl_env.proxy_recurse,MAX_PROXY_RECURSE);
                goto error;
        }

        /* fix the timer_avp name */
        if (timer_avp.s && timer_avp.len > 0) {
                if (pv_parse_spec(&timer_avp, &avp_spec)==0
                                || avp_spec.type!=PVT_AVP) {
                        LM_ERR("malformed or non AVP %.*s AVP definition\n", timer_avp.len, timer_avp.s);
                        return -1;
                }

                if(pv_get_avp_name(0, &(avp_spec.pvp), &cpl_env.timer_avp,
                                                        &avp_type)!=0)
                {
                        LM_ERR("[%.*s]- invalid AVP definition\n", timer_avp.len, timer_avp.s);
                        return -1;
                }
                cpl_env.timer_avp_type = avp_type;
        }

        if (dtd_file==0) {
                LM_CRIT("mandatory parameter \"cpl_dtd_file\" found empty\n");
                goto error;
        } else {
                /* check if the dtd file exists */
                if (stat( dtd_file, &stat_t)==-1) {
                        LM_ERR("checking file \"%s\" status failed; stat returned %s\n",
                                        dtd_file,strerror(errno));
                        goto error;
                }
                if ( !S_ISREG( stat_t.st_mode ) ) {
                        LM_ERR("dir \"%s\" is not a regular file!\n", dtd_file);
                        goto error;
                }
                if (access( dtd_file, R_OK )==-1) {
                        LM_ERR("checking file \"%s\" for permissions "
                                "failed; access returned %s\n",dtd_file,strerror(errno));
                        goto error;
                }
        }

        if (cpl_env.log_dir==0) {
                LM_INFO("log_dir param found empty -> logging disabled!\n");
        } else {
                if ( strlen(cpl_env.log_dir)>MAX_LOG_DIR_SIZE ) {
                        LM_ERR("dir \"%s\" has a too long name :-(!\n", cpl_env.log_dir);
                        goto error;
                }
                /* check if the dir exists */
                if (stat( cpl_env.log_dir, &stat_t)==-1) {
                        LM_ERR("checking dir \"%s\" status failed;"
                                " stat returned %s\n",cpl_env.log_dir,strerror(errno));
                        goto error;
                }
                if ( !S_ISDIR( stat_t.st_mode ) ) {
                        LM_ERR("dir \"%s\" is not a directory!\n", cpl_env.log_dir);
                        goto error;
                }
                if (access( cpl_env.log_dir, R_OK|W_OK )==-1) {
                        LM_ERR("checking dir \"%s\" for permissions failed; access "
                                        "returned %s\n", cpl_env.log_dir, strerror(errno));
                        goto error;
                }
        }

        /* bind to the mysql module */
        if (cpl_db_bind(&db_url, &db_table)<0) goto error;

        /* load TM API */
        if (load_tm_api(&cpl_fct.tmb)!=0) {
                LM_ERR("can't load TM API\n");
                goto error;
        }
        /* bind the SL API */
        if (sl_load_api(&cpl_fct.slb)!=0) {
                LM_ERR("cannot bind to SL API\n");
                return -1;
        }

        /* bind to usrloc module if requested */
        if (lookup_domain) {
                /* import all usrloc functions */
                bind_usrloc = (bind_usrloc_t)find_export("ul_bind_usrloc", 1, 0);
                if (!bind_usrloc) {
                        LM_ERR("can't bind usrloc\n");
                        goto error;
                }
                if (bind_usrloc( &(cpl_fct.ulb) ) < 0) {
                        LM_ERR("importing usrloc failed\n");
                        goto error;
                }
                /* convert lookup_domain from char* to udomain_t* pointer */
                if (cpl_fct.ulb.register_udomain( lookup_domain, &cpl_env.lu_domain)
                < 0) {
                        LM_ERR("failed to register domain <%s>\n",lookup_domain);
                        goto error;
                }
        } else {
                LM_NOTICE("no lookup_domain given -> disable lookup node\n");
        }

        /* build a pipe for sending commands to aux process */
        if ( pipe( cpl_env.cmd_pipe )==-1 ) {
                LM_CRIT("cannot create command pipe: %s!\n", strerror(errno) );
                goto error;
        }
        /* set the writing non blocking */
        if ( (val=fcntl(cpl_env.cmd_pipe[1], F_GETFL, 0))<0 ) {
                LM_ERR("getting flags from pipe[1] failed: fcntl said %s!\n",
                                strerror(errno));
                goto error;
        }
        if ( fcntl(cpl_env.cmd_pipe[1], F_SETFL, val|O_NONBLOCK) ) {
                LM_ERR("setting flags to pipe[1] failed: fcntl said %s!\n",
                                strerror(errno));
                goto error;
        }

        /* init the CPL parser */
        if (init_CPL_parser( dtd_file )!=1 ) {
                LM_ERR("init_CPL_parser failed!\n");
                goto error;
        }

        /* make a copy of the original TZ env. variable */
        ptr = getenv("TZ");
        cpl_env.orig_tz.len = 3/*"TZ="*/ + (ptr?(strlen(ptr)+1):0);
        if ( (cpl_env.orig_tz.s=shm_malloc( cpl_env.orig_tz.len ))==0 ) {
                LM_ERR("no more shm mem. for saving TZ!\n");
                goto error;
        }
        memcpy(cpl_env.orig_tz.s,"TZ=",3);
        if (ptr)
                strcpy(cpl_env.orig_tz.s+3,ptr);

        /* convert realm_prefix from string null terminated to str */
        if (cpl_env.realm_prefix.s) {
                cpl_env.realm_prefix.len = strlen(cpl_env.realm_prefix.s);
                /* convert the realm_prefix to lower cases */
                strlower( &cpl_env.realm_prefix );
        }

        return 0;
error:
        return -1;
}



static int cpl_child_init(int rank)
{
        if (rank==PROC_INIT || rank==PROC_MAIN || rank==PROC_TCP_MAIN)
                return 0; /* do nothing for the main process */

        return cpl_db_init(&db_url, &db_table);
}


static int mi_child_init(void)
{
        return cpl_db_init(&db_url, &db_table);
}


static void cpl_process(int rank)
{
        cpl_aux_process( cpl_env.cmd_pipe[0], cpl_env.log_dir);
        exit(-1);
}


static int cpl_exit(void)
{
        /* free the TZ orig */
        if (cpl_env.orig_tz.s)
                shm_free(cpl_env.orig_tz.s);

        return 0;
}



static inline int build_user_AOR(str *username, str *domain, str *uh, int sip)
{
        unsigned char do_strip;
        char *p;
        int i;

        /* calculate the len (without terminating \0) */
        uh->len = 4*(sip!=0) + username->len;
        do_strip = 0;

        if (sip || cpl_env.use_domain) {
                /* do we need to strip realm prefix? */
                if (cpl_env.realm_prefix.len && cpl_env.realm_prefix.len<domain->len){
                        for( i=cpl_env.realm_prefix.len-1 ; i>=0 ; i-- )
                                if ( cpl_env.realm_prefix.s[i]!=tolower(domain->s[i]) )
                                        break;
                        if (i==-1)
                                do_strip = 1;
                }
                uh->len += 1 + domain->len - do_strip*cpl_env.realm_prefix.len;
        }

        uh->s = (char*)shm_malloc( uh->len + 1 );
        if (!uh->s) {
                LM_ERR("no more shm memory.\n");
                return -1;
        }

        /* build user@host */
        p = uh->s;
        if (sip) {
                memcpy( uh->s, "sip:", 4);
                p += 4;
        }
        /* user part */
        if (cpl_env.case_sensitive) {
                memcpy( p, username->s, username->len);
                p += username->len;
        } else {
                for(i=0;i<username->len;i++)
                        *(p++) = tolower(username->s[i]);
        }
        if (sip || cpl_env.use_domain) {
                *(p++) = '@';
                /* host part in lower cases */
                for( i=do_strip*cpl_env.realm_prefix.len ; i< domain->len ; i++ )
                        *(p++) = tolower(domain->s[i]);
        }
        *(p++) = 0;

        /* sanity check */
        if (p-uh->s!=uh->len+1) {
                LM_CRIT("buffer overflow l=%d,w=%ld\n", uh->len,(long)(p-uh->s));
                return -1;
        }
        return 0;
}



static inline int get_dest_user(struct sip_msg *msg, str *username, str *domain)
{
        struct sip_uri uri;

        /*  get the user_name from new_uri/RURI/To */
        LM_DBG("trying to get user from new_uri\n");
        if ( !msg->new_uri.s || parse_uri( msg->new_uri.s,msg->new_uri.len,&uri)<0
        || !uri.user.len )
        {
                LM_DBG("trying to get user from R_uri\n");
                if ( parse_uri( msg->first_line.u.request.uri.s,
                msg->first_line.u.request.uri.len ,&uri)==-1 || !uri.user.len )
                {
                        LM_DBG("trying to get user from To\n");
                        if ( (!msg->to&&((parse_headers(msg,HDR_TO_F,0)==-1)||!msg->to))||
                        parse_uri( get_to(msg)->uri.s, get_to(msg)->uri.len, &uri)<0
                        || !uri.user.len)
                        {
                                LM_ERR("unable to extract user name from RURI or To header!\n");
                                return -1;
                        }
                }
        }
        *username = uri.user;
        *domain = uri.host;
        return 0;
}



static inline int get_orig_user(struct sip_msg *msg, str *username, str *domain)
{
        struct to_body *from;
        struct sip_uri uri;
        
        /* if it's outgoing -> get the user_name from From */
        /* parsing from header */
        LM_DBG("trying to get user from From\n");
        if ( parse_from_header( msg )==-1 ) {
                LM_ERR("unable to extract URI from FROM header\n");
                return -1;
        }
        from = (struct to_body*)msg->from->parsed;
        /* parse the extracted uri from From */
        if (parse_uri( from->uri.s, from->uri.len, &uri)||!uri.user.len) {
                LM_ERR("unable to extract user name from URI (From header)\n");
                return -1;
        }
        *username = uri.user;
        *domain = uri.host;
        return 0;
}



/* Params: 
 *   str1 - as unsigned int - can be CPL_RUN_INCOMING or CPL_RUN_OUTGOING 
 *   str2 - as unsigned int - flags regarding state(less)|(ful) 
 */
static int cpl_invoke_script(struct sip_msg* msg, char* str1, char* str2)
{
        struct cpl_interpreter  *cpl_intr;
        str  username = {0,0};
        str  domain = {0,0};
        str  loc;
        str  script;

        /* get the user_name */
        if ( ((unsigned long)str1)&CPL_RUN_INCOMING ) {
                /* if it's incoming -> get the destination user name */
                if (get_dest_user( msg, &username, &domain)==-1)
                        goto error0;
        } else {
                /* if it's outgoing -> get the origin user name */
                if (get_orig_user( msg, &username, &domain)==-1)
                        goto error0;
        }

        /* get the script for this user */
        if (get_user_script(&username, cpl_env.use_domain?&domain:0,
        &script, &cpl_bin_col)==-1)
                goto error0;

        /* has the user a non-empty script? if not, return normally, allowing the
         * script execution to continue */
        if ( !script.s || !script.len )
                return 1;

        /* build a new script interpreter */
        if ( (cpl_intr=new_cpl_interpreter(msg,&script))==0 )
                goto error1;
        /* set the flags */
        cpl_intr->flags =(unsigned int)((unsigned long)str1)|((unsigned long)str2);
        /* build user AOR */
        if (build_user_AOR( &username, &domain, &(cpl_intr->user), 0)!=0 )
                goto error2;
        /* for OUTGOING we need also the destination user for init. with him
         * the location set */
        if ( ((unsigned long)str1)&CPL_RUN_OUTGOING ) {
                /* build user initial location -> get the destination user name */
                if (get_dest_user( msg, &username, &domain)==-1)
                        goto error2;
                if (build_user_AOR( &username, &domain, &loc, 1)!=0 )
                        goto error2;
                if (add_location( &(cpl_intr->loc_set), &loc, 0, 10, 0/*no dup*/)==-1)
                        goto error2;
        }

        /* run the script */
        switch (cpl_run_script( cpl_intr )) {
                case SCRIPT_DEFAULT:
                        free_cpl_interpreter( cpl_intr );
                        return 1; /* execution of ser's script will continue */
                case SCRIPT_END:
                        free_cpl_interpreter( cpl_intr );
                case SCRIPT_TO_BE_CONTINUED:
                        return 0; /* break the SER script */
                case SCRIPT_RUN_ERROR:
                case SCRIPT_FORMAT_ERROR:
                        goto error2;
        }

        return 1;
error2:
        free_cpl_interpreter( cpl_intr );
        return -1;
error1:
        shm_free(script.s);
error0:
        return -1;
}



#define CPL_SCRIPT          "script"
#define CPL_SCRIPT_LEN      (sizeof(CPL_SCRIPT)-1)
#define ACTION_PARAM        "action"
#define ACTION_PARAM_LEN    (sizeof(ACTION_PARAM)-1)
#define STORE_ACTION        "store"
#define STORE_ACTION_LEN    (sizeof(STORE_ACTION)-1)
#define REMOVE_ACTION       "remove"
#define REMOVE_ACTION_LEN   (sizeof(REMOVE_ACTION)-1)

#define REMOVE_SCRIPT       0xcaca
#define STORE_SCRIPT        0xbebe

#define CONTENT_TYPE_HDR      ("Content-Type: application/cpl-xml"CRLF)
#define CONTENT_TYPE_HDR_LEN  (sizeof(CONTENT_TYPE_HDR)-1)

struct cpl_error {
        int   err_code;
        str   err_msg;
};

static struct cpl_error bad_req = {400,str_init("Bad request")};
static struct cpl_error intern_err = {500,str_init("Internal server error")};
static struct cpl_error bad_cpl = {400,str_init("Bad CPL script")};

static struct cpl_error *cpl_err = &bad_req;


static inline int do_script_action(struct sip_msg *msg, int action)
{
        str  body = {0,0};
        str  bin  = {0,0};
        str  log  = {0,0};
        str  username = {0,0};
        str  domain   = {0,0};

        /* content-length (if present) */
        if ( !msg->content_length &&
        ((parse_headers(msg,HDR_CONTENTLENGTH_F,0)==-1)||!msg->content_length)) {
                LM_ERR("no Content-Length hdr found!\n");
                goto error;
        }
        body.len = get_content_length( msg );

        /* get the user name */
        if (get_dest_user( msg, &username, &domain)==-1)
                goto error;

        /* we have the script and the user */
        switch (action) {
                case STORE_SCRIPT :
                        /* check the len -> it must not be 0 */
                        if (body.len==0) {
                                LM_ERR("0 content-len found for store\n");
                                goto error_1;
                        }
                        /* get the message's body */
                        body.s = get_body( msg );
                        if (body.s==0) {
                                LM_ERR("cannot extract body from msg!\n");
                                goto error_1;
                        }
                        /* now compile the script and place it into database */
                        /* get the binary coding for the XML file */
                        if ( encodeCPL( &body, &bin, &log)!=1) {
                                cpl_err = &bad_cpl;
                                goto error_1;
                        }

                        /* write both the XML and binary formats into database */
                        if (write_to_db( &username, cpl_env.use_domain?&domain:0,
                        &body,&bin)!=1) {
                                cpl_err = &intern_err;
                                goto error_1;
                        }
                        break;
                case REMOVE_SCRIPT:
                        /* check the len -> it must be 0 */
                        if (body.len!=0) {
                                LM_ERR("non-0 content-len found for remove\n");
                                goto error_1;
                        }
                        /* remove the script for the user */
                        if (rmv_from_db( &username, cpl_env.use_domain?&domain:0)!=1) {
                                cpl_err = &intern_err;
                                goto error_1;
                        }
                        break;
        }

        if (log.s) pkg_free( log.s );
        return 0;
error_1:
        if (log.s) pkg_free( log.s );
error:
        return -1;
}



static inline int do_script_download(struct sip_msg *msg)
{
        str username  = {0,0};
        str domain = {0,0};
        str script = {0,0};

        /* get the destination user name */
        if (get_dest_user( msg, &username, &domain)!=0)
                goto error;

        /* get the user's xml script from the database */
        if (get_user_script( &username, cpl_env.use_domain?&domain:0,
        &script, &cpl_xml_col)==-1)
                goto error;

        /* add a lump with content-type hdr */
        if (add_lump_rpl( msg, CONTENT_TYPE_HDR, CONTENT_TYPE_HDR_LEN,
        LUMP_RPL_HDR)==0) {
                LM_ERR("cannot build hdr lump\n");
                cpl_err = &intern_err;
                goto error;
        }

        if (script.s!=0) {
                /* user has a script -> add a body lump */
                if ( add_lump_rpl( msg, script.s, script.len, LUMP_RPL_BODY)==0) {
                        LM_ERR("cannot build body lump\n");
                        cpl_err = &intern_err;
                        goto error;
                }
                /* build_lump_rpl duplicates the added text, so free the original */
                shm_free( script.s );
        }

        return 0;
error:
        if (script.s)
                shm_free(script.s);
        return -1;
}



static int w_process_register(struct sip_msg* msg, char* str, char* str2)
{
        return cpl_process_register( msg, 0);
}



static int w_process_register_norpl(struct sip_msg* msg, char* str,char* str2)
{
        return cpl_process_register( msg, 1);
}



static int cpl_process_register(struct sip_msg* msg, int no_rpl)
{
        struct disposition *disp;
        struct disposition_param *param;
        int  ret;
        int  mime;
        int  *mimes;

        /* make sure that is a REGISTER ??? */

        /* here should be the CONTACT- hack */

        /* is there a CONTENT-TYPE hdr ? */
        mime = parse_content_type_hdr( msg );
        if (mime==-1)
                goto error;

        /* check the mime type */
        LM_DBG("Content-Type mime found %u, %u\n",
                mime>>16,mime&0x00ff);
        if ( mime && mime==(TYPE_APPLICATION<<16)+SUBTYPE_CPLXML ) {
                /* can be an upload or remove -> check for the content-purpose and
                 * content-action headers */
                LM_DBG("carrying CPL -> look at Content-Disposition\n");
                if (parse_content_disposition( msg )!=0) {
                        LM_ERR("Content-Disposition missing or corrupted\n");
                        goto error;
                }
                disp = get_content_disposition(msg);
                print_disposition( disp ); /* just for DEBUG */
                /* check if the type of disposition is SCRIPT */
                if (disp->type.len!=CPL_SCRIPT_LEN ||
                strncasecmp(disp->type.s,CPL_SCRIPT,CPL_SCRIPT_LEN) ) {
                        LM_ERR("bogus message - Content-Type"
                                "says CPL_SCRIPT, but Content-Disposition something else\n");
                        goto error;
                }
                /* disposition type is OK -> look for action parameter */
                for(param=disp->params;param;param=param->next) {
                        if (param->name.len==ACTION_PARAM_LEN &&
                        !strncasecmp(param->name.s,ACTION_PARAM,ACTION_PARAM_LEN))
                                break;
                }
                if (param==0) {
                        LM_ERR("bogus message - "
                                "Content-Disposition has no action param\n");
                        goto error;
                }
                /* action param found -> check its value: store or remove */
                if (param->body.len==STORE_ACTION_LEN &&
                !strncasecmp( param->body.s, STORE_ACTION, STORE_ACTION_LEN)) {
                        /* it's a store action -> get the script from body message and store
                         * it into database (CPL and BINARY format) */
                        if (do_script_action( msg, STORE_SCRIPT)==-1)
                                goto error;
                } else
                if (param->body.len==REMOVE_ACTION_LEN &&
                !strncasecmp( param->body.s, REMOVE_ACTION, REMOVE_ACTION_LEN)) {
                        /* it's a remove action -> remove the script from database */
                        if (do_script_action( msg, REMOVE_SCRIPT)==-1)
                                goto error;
                } else {
                        LM_ERR("unknown action <%.*s>\n",
                                param->body.len,param->body.s);
                        goto error;
                }

                /* do I have to send to reply? */
                if (no_rpl)
                        goto resume_script;

                /* send a 200 OK reply back */
                cpl_fct.slb.freply( msg, 200, &cpl_ok_rpl);
                /* I send the reply and I don't want to return to script execution, so
                 * I return 0 to do break */
                goto stop_script;
        }

        /* is there an ACCEPT hdr ? */
        if ( (ret=parse_accept_hdr(msg))<0)
                goto error;
        if (ret==0 || (mimes=get_accept(msg))==0 )
                /* accept header not present or no mimes found */
                goto resume_script;

        /* looks if the REGISTER accepts cpl-xml or * */
        while (*mimes) {
                LM_DBG("accept mime found %u, %u\n",
                        (*mimes)>>16,(*mimes)&0x00ff);
                if (*mimes==(TYPE_ALL<<16)+SUBTYPE_ALL ||
                *mimes==(TYPE_APPLICATION<<16)+SUBTYPE_CPLXML )
                        break;
                mimes++;
        }
        if (*mimes==0)
                /* no accept mime that matched cpl */
                goto resume_script;

        /* get the user name from msg, retrieve the script from db
         * and appended to reply */
        if (do_script_download( msg )==-1)
                goto error;

        /* do I have to send to reply? */
        if (no_rpl)
                goto resume_script;

        /* send a 200 OK reply back */
        cpl_fct.slb.freply( msg, 200, &cpl_ok_rpl);

stop_script:
        return 0;
resume_script:
        return 1;
error:
        /* send a error reply back */
        cpl_fct.slb.freply( msg, cpl_err->err_code, &cpl_err->err_msg);
        /* I don't want to return to script execution, so I return 0 to do break */
        return 0;
}