wsp_unit.c

来自「mms client」· C语言 代码 · 共 276 行

/*
 * wsp_unit.c - Implement WSP Connectionless mode
 *
 * Lars Wirzenius
 */


#include <string.h>

#include "gwlib/gwlib.h"
#include "wsp.h"
#include "wsp_pdu.h"
#include "wsp_headers.h"
#include "wap_events.h"
#include "wsp_strings.h"
#include "wap.h"


/*
 * Give the status the module:
 *
 *	limbo
 *		not running at all
 *	running
 *		operating normally
 *	terminating
 *		waiting for operations to terminate, returning to limbo
 */
static enum {
    limbo, running, terminating
} run_status = limbo;

static wap_dispatch_func_t *dispatch_to_wdp;
static wap_dispatch_func_t *dispatch_to_appl;

static List *queue = NULL;


static void main_thread(void *);
static WAPEvent *pack_into_result_datagram(WAPEvent *event);
static WAPEvent *pack_into_push_datagram(WAPEvent *event);

/***********************************************************************
 * Public functions
 */


void wsp_unit_init(wap_dispatch_func_t *datagram_dispatch,
                   wap_dispatch_func_t *application_dispatch) {
    queue = list_create();
    list_add_producer(queue);
    dispatch_to_wdp = datagram_dispatch;
    dispatch_to_appl = application_dispatch;
    wsp_strings_init();
    run_status = running;
    gwthread_create(main_thread, NULL);
}


void wsp_unit_shutdown(void) {
    gw_assert(run_status == running);
    run_status = terminating;
    list_remove_producer(queue);
    gwthread_join_every(main_thread);
    list_destroy(queue, wap_event_destroy_item);
    wsp_strings_shutdown();
}


void wsp_unit_dispatch_event(WAPEvent *event) {
    wap_event_assert(event);
    list_produce(queue, event);
}


static WAPEvent *unpack_datagram(WAPEvent *datagram) {
    WAPEvent *event;
    Octstr *os;
    WSP_PDU *pdu;
    long tid_byte;
    int method;
    Octstr *method_name;

    gw_assert(datagram->type == T_DUnitdata_Ind);

    os = NULL;
    pdu = NULL;
    event = NULL;

    os = octstr_duplicate(datagram->u.T_DUnitdata_Ind.user_data);
    if (octstr_len(os) == 0) {
        warning(0, "WSP UNIT: Empty datagram.");
        goto error;
    }

    tid_byte = octstr_get_char(os, 0);
    octstr_delete(os, 0, 1);

    pdu = wsp_pdu_unpack(os);
    if (pdu == NULL)
        goto error;

    if (pdu->type != Get && pdu->type != Post) {
        warning(0, "WSP UNIT: Unsupported PDU type %d", pdu->type);
        goto error;
    }

    event = wap_event_create(S_Unit_MethodInvoke_Ind);
    event->u.S_Unit_MethodInvoke_Ind.addr_tuple = wap_addr_tuple_duplicate(
                                                                          datagram->u.T_DUnitdata_Ind.addr_tuple);
    event->u.S_Unit_MethodInvoke_Ind.transaction_id = tid_byte;

    switch (pdu->type) {
        case Get:
            debug("wap.wsp", 0, "Connectionless Get request received.");
            method = GET_METHODS + pdu->u.Get.subtype;
            event->u.S_Unit_MethodInvoke_Ind.request_uri = 
            octstr_duplicate(pdu->u.Get.uri);
            event->u.S_Unit_MethodInvoke_Ind.request_headers = 
            wsp_headers_unpack(pdu->u.Get.headers, 0);
            event->u.S_Unit_MethodInvoke_Ind.request_body = NULL;
            break;

        case Post:
            debug("wap.wsp", 0, "Connectionless Post request received.");
            method = POST_METHODS + pdu->u.Post.subtype;
            event->u.S_Unit_MethodInvoke_Ind.request_uri = 
            octstr_duplicate(pdu->u.Post.uri);
            event->u.S_Unit_MethodInvoke_Ind.request_headers = 
            wsp_headers_unpack(pdu->u.Post.headers, 1);
            event->u.S_Unit_MethodInvoke_Ind.request_body = 
            octstr_duplicate(pdu->u.Post.data);
            break;

        default:
            warning(0, "WSP UNIT: Unsupported PDU type %d", pdu->type);
            goto error;
    }

    method_name = wsp_method_to_string(method);
    if (method_name == NULL)
        method_name = octstr_format("UNKNOWN%02X", method);
    event->u.S_Unit_MethodInvoke_Ind.method = method_name;

    octstr_destroy(os);
    wsp_pdu_destroy(pdu);
    return event;

    error:
    octstr_destroy(os);
    wsp_pdu_destroy(pdu);
    wap_event_destroy(event);
    return NULL;
}


/***********************************************************************
 * Local functions
 */


static void main_thread(void *arg) {
    WAPEvent *e;
    WAPEvent *newevent;

    while (run_status == running && (e = list_consume(queue)) != NULL) {
        wap_event_assert(e);
        switch (e->type) {
            case T_DUnitdata_Ind:
                newevent = unpack_datagram(e);
                dispatch_to_appl(newevent);
                break;

            case S_Unit_MethodResult_Req:
                newevent = pack_into_result_datagram(e);
                if (newevent != NULL)
                    dispatch_to_wdp(newevent);
                break;

            case S_Unit_Push_Req:
                newevent = pack_into_push_datagram(e);
                if (newevent != NULL)
                    dispatch_to_wdp(newevent);
                break;

            default:
                warning(0, "WSP UNIT: Unknown event type %d", e->type);
                break;
        }

        wap_event_destroy(e);
    }
}

/*
 * We do not set TUnitData.ind's SMS-specific fields here, because we do not
 * support sending results to the phone over SMS.
 */
static WAPEvent *pack_into_result_datagram(WAPEvent *event) {
    WAPEvent *datagram;
    struct S_Unit_MethodResult_Req *p;
    WSP_PDU *pdu;
    Octstr *ospdu;
    unsigned char tid;

    gw_assert(event->type == S_Unit_MethodResult_Req);
    p = &event->u.S_Unit_MethodResult_Req;

    pdu = wsp_pdu_create(Reply);
    pdu->u.Reply.status = wsp_convert_http_status_to_wsp_status(p->status);
    pdu->u.Reply.headers = wsp_headers_pack(p->response_headers, 1);
    pdu->u.Reply.data = octstr_duplicate(p->response_body);
    ospdu = wsp_pdu_pack(pdu);
    wsp_pdu_destroy(pdu);
    if (ospdu == NULL)
        return NULL;

    tid = p->transaction_id;
    octstr_insert_data(ospdu, 0, &tid, 1);

    datagram = wap_event_create(T_DUnitdata_Req);
    datagram->u.T_DUnitdata_Req.addr_tuple =
    wap_addr_tuple_duplicate(p->addr_tuple);
    datagram->u.T_DUnitdata_Req.user_data = ospdu;

    return datagram;
}

/*
 * According to WSP table 12, p. 63, push id and transaction id are stored 
 * into same field. T-UnitData.ind is different for IP and SMS bearer.
 */
static WAPEvent *pack_into_push_datagram(WAPEvent *event) {
    WAPEvent *datagram;
    WSP_PDU *pdu;
    Octstr *ospdu;
    unsigned char push_id;

    gw_assert(event->type == S_Unit_Push_Req);
    debug("wap.wsp.unit", 0, "WSP_UNIT: Connectionless push accepted");
    pdu = wsp_pdu_create(Push);
    pdu->u.Push.headers = wsp_headers_pack(
                                          event->u.S_Unit_Push_Req.push_headers, 1);
    pdu->u.Push.data = octstr_duplicate(
                                       event->u.S_Unit_Push_Req.push_body);
    ospdu = wsp_pdu_pack(pdu);
    wsp_pdu_destroy(pdu);
    if (ospdu == NULL)
        return NULL;

    push_id = event->u.S_Unit_Push_Req.push_id;
    octstr_insert_data(ospdu, 0, &push_id, 1);

    datagram = wap_event_create(T_DUnitdata_Req);

    datagram->u.T_DUnitdata_Req.addr_tuple =
    wap_addr_tuple_duplicate(event->u.S_Unit_Push_Req.addr_tuple);
    datagram->u.T_DUnitdata_Req.address_type = 
    event->u.S_Unit_Push_Req.address_type;
    if (event->u.S_Unit_Push_Req.smsc_id != NULL)
        datagram->u.T_DUnitdata_Req.smsc_id =
        octstr_duplicate(event->u.S_Unit_Push_Req.smsc_id);
    else
        datagram->u.T_DUnitdata_Req.smsc_id = NULL;

    datagram->u.T_DUnitdata_Req.user_data = ospdu;
    debug("wap.wsp.unit", 0, "WSP_UNIT: delivering to wdp");

    return datagram;
}