introduce bchan handler infrastructure
This should allow us to implement a variety of different bearer channel handlers.
This commit is contained in:
parent
1751d4b827
commit
d375bee190
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@ -0,0 +1,339 @@
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2
Makefile
2
Makefile
|
@ -12,7 +12,7 @@ clean:
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|||
%.o: %.c
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||||
$(CC) $(CFLAGS) -o $@ -c $^
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||||
|
||||
capi-test: capi.o capiconn.o
|
||||
capi-test: capi.o capiconn.o bchan.o hdlr_raw_loop.o
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||||
$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
|
||||
|
||||
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@ -0,0 +1,71 @@
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/* B-channel handler management. Handles registration of and routing to
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||||
* various potentially registered B-channel handlers / routes
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||||
*
|
||||
* (C) 2022 by Harald Welte <laforge@gnumonks.org>
|
||||
*
|
||||
* SPDX-License-Identifier: GPL-2.0-or-later
|
||||
*/
|
||||
|
||||
#include <osmocom/core/utils.h>
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||||
#include <osmocom/core/linuxlist.h>
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#include <string.h>
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||||
#include <talloc.h>
|
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|
||||
#include "bchan.h"
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||||
|
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static LLIST_HEAD(g_handlers);
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static LLIST_HEAD(g_routes);
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||||
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extern void *g_ctx;
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|
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struct bchan_handler *bchan_handler_find(const char *name)
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||||
{
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struct bchan_handler *bch;
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|
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llist_for_each_entry(bch, &g_handlers, list) {
|
||||
if (!strcmp(bch->name, name))
|
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return bch;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
void bchan_handler_register(struct bchan_handler *hdlr)
|
||||
{
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||||
OSMO_ASSERT(!bchan_handler_find(hdlr->name));
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OSMO_ASSERT(hdlr->list.next == NULL);
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||||
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||||
llist_add_tail(&hdlr->list, &g_handlers);
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||||
}
|
||||
|
||||
|
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void bchan_route_add(int cip, const char *msn, const char *hdlr_name)
|
||||
{
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struct bchan_handler *bch = bchan_handler_find(hdlr_name);
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struct bchan_route *rt;
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OSMO_ASSERT(bch);
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rt = talloc_zero(g_ctx, struct bchan_route);
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rt->cip = cip;
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rt->msn = talloc_strdup(rt, msn);
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rt->hdlr = bch;
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||||
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llist_add_tail(&rt->list, &g_routes);
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}
|
||||
|
||||
|
||||
/* find b-channel handler for given CIP + MSN */
|
||||
struct bchan_handler *bchan_handler_for_call(uint16_t cip, const char *msn)
|
||||
{
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||||
struct bchan_route *route;
|
||||
|
||||
llist_for_each_entry(route, &g_routes, list) {
|
||||
if (route->cip != -1 && route->cip != cip)
|
||||
continue;
|
||||
if (route->msn && strcmp(route->msn, msn))
|
||||
continue;
|
||||
return route->hdlr;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
|
@ -0,0 +1,78 @@
|
|||
#pragma once
|
||||
|
||||
/* B-channel handler management. Handles registration of and routing to
|
||||
* various potentially registered B-channel handlers / routes
|
||||
*
|
||||
* (C) 2022 by Harald Welte <laforge@gnumonks.org>
|
||||
*
|
||||
* SPDX-License-Identifier: GPL-2.0-or-later
|
||||
*/
|
||||
|
||||
#include <stdint.h>
|
||||
#include <osmocom/core/linuxlist.h>
|
||||
|
||||
struct capi_connection;
|
||||
|
||||
struct bchan_handler_cfg {
|
||||
/* B1/B2/B3 protocol used in CAPI CONNECT_RESP */
|
||||
struct {
|
||||
uint16_t b1;
|
||||
uint16_t b2;
|
||||
uint16_t b3;
|
||||
} proto;
|
||||
const uint8_t *ncpi;
|
||||
uint32_t max_b_data_blocks;
|
||||
uint32_t max_b_data_len;
|
||||
};
|
||||
|
||||
struct call_state;
|
||||
|
||||
/* call-back functions (operations) for a B-channel handler */
|
||||
struct bchan_handler_ops {
|
||||
/* initialize whatever handler-private state (call setup) */
|
||||
int (*init)(struct call_state *cst);
|
||||
/* receive data (ISDN -> handler) */
|
||||
void (*rx_data)(struct call_state *cst, const uint8_t *data, uint8_t len);
|
||||
/* destroy whatever handler-private state (call teardown) */
|
||||
void (*fini)(struct call_state *cst);
|
||||
};
|
||||
|
||||
/* The actual B-channel handler: list/name/config/ops */
|
||||
struct bchan_handler {
|
||||
struct llist_head list;
|
||||
/* name of this handler / application */
|
||||
const char *name;
|
||||
/* CAPI related configuration */
|
||||
struct bchan_handler_cfg cfg;
|
||||
struct bchan_handler_ops ops;
|
||||
|
||||
/* handler private data */
|
||||
void *priv;
|
||||
};
|
||||
|
||||
/* representation of one given call within a specific bchan-handler */
|
||||
struct call_state {
|
||||
/* back-pointer to handler */
|
||||
struct bchan_handler *bch;
|
||||
/* capiconn.h state */
|
||||
struct capi_connection *cc;
|
||||
/* per-call private state (return value of bchan_handler.init) */
|
||||
void *priv;
|
||||
};
|
||||
|
||||
|
||||
/* a route for routing incoming calls to a bchan-handler */
|
||||
struct bchan_route {
|
||||
/* global list of bchan_routes */
|
||||
struct llist_head list;
|
||||
int cip; /* -1: accept any CIP */
|
||||
const char *msn; /* NULL: accept any MSN / called number */
|
||||
struct bchan_handler *hdlr; /* handler for this CIP/MSN */
|
||||
};
|
||||
|
||||
struct bchan_handler *bchan_handler_find(const char *name);
|
||||
void bchan_handler_register(struct bchan_handler *hdlr);
|
||||
void bchan_route_add(int cip, const char *msn, const char *hdlr_name);
|
||||
struct bchan_handler *bchan_handler_for_call(uint16_t cip, const char *msn);
|
||||
|
||||
int bchan_call_tx(struct call_state *cst, const uint8_t *data, size_t len);
|
66
capi.c
66
capi.c
|
@ -1,3 +1,10 @@
|
|||
/* CAPI based ISDN testing utility.
|
||||
*
|
||||
* (C) 2022 by Harald Welte <laforge@gnumonks.org>
|
||||
*
|
||||
* SPDX-License-Identifier: GPL-2.0-or-later
|
||||
*/
|
||||
|
||||
#include <malloc.h>
|
||||
#include <errno.h>
|
||||
|
||||
|
@ -11,20 +18,21 @@
|
|||
#include <capi_debug.h>
|
||||
|
||||
#include "capiconn.h"
|
||||
#include "bchan.h"
|
||||
|
||||
#define CM(x) (1<<(x))
|
||||
#define CIPMASK_ALL 0x1FFF03FF
|
||||
#define CIPMASK_VOICE (CM(1)|CM(4)|CM(5)|CM(16)|CM(26))
|
||||
#define CIPMASK_DATA (CM(2)|CM(3))
|
||||
|
||||
void *g_ctx;
|
||||
|
||||
|
||||
enum log_subsys {
|
||||
DLCAPI20,
|
||||
DCAPI,
|
||||
};
|
||||
|
||||
static void *tall_capi_ctx;
|
||||
|
||||
struct capi_inst {
|
||||
unsigned int applid;
|
||||
capiconn_context *cc_ctx;
|
||||
|
@ -60,7 +68,7 @@ static const char *conninfo(capi_connection *p)
|
|||
|
||||
static void *cb_malloc(size_t size)
|
||||
{
|
||||
return talloc_size(tall_capi_ctx, size);
|
||||
return talloc_size(g_ctx, size);
|
||||
}
|
||||
|
||||
static void cb_free(void *buf)
|
||||
|
@ -70,15 +78,49 @@ static void cb_free(void *buf)
|
|||
|
||||
static void cb_disconnected(capi_connection *cp, int localdisconnect, unsigned reason, unsigned reason_b3)
|
||||
{
|
||||
struct call_state *cst;
|
||||
LOGP(DCAPI, LOGL_DEBUG, "%s(local=%d, reason=0x%4x, reason_b3=0x%x)\n", __func__, localdisconnect, reason, reason_b3);
|
||||
|
||||
cst = capiconn_getpriv(cp);
|
||||
OSMO_ASSERT(cst);
|
||||
if (cst->bch->ops.fini)
|
||||
cst->bch->ops.fini(cst);
|
||||
talloc_free(cst);
|
||||
}
|
||||
|
||||
static void cb_incoming(capi_connection *cp, unsigned contr, unsigned cipvalue, char *called, char *calling)
|
||||
{
|
||||
struct bchan_handler *bch;
|
||||
int rc;
|
||||
|
||||
printf("incoming call: %s (0x%x) %s -> %s\n", conninfo(cp), cipvalue, calling, called);
|
||||
/* we should call capiconn_{accept,ignore,reject} */
|
||||
if (1) {
|
||||
capiconn_accept(cp, 1, 1, 0, 0, 0, 0, 0);
|
||||
|
||||
bch = bchan_handler_for_call(cipvalue, called);
|
||||
if (bch) {
|
||||
struct call_state *cst = talloc_zero(g_ctx, struct call_state);
|
||||
if (!cst) {
|
||||
capiconn_reject(cp);
|
||||
return;
|
||||
}
|
||||
cst->bch = bch;
|
||||
cst->cc = cp;
|
||||
if (bch->ops.init) {
|
||||
rc = bch->ops.init(cst);
|
||||
if (rc < 0) {
|
||||
talloc_free(cst);
|
||||
capiconn_reject(cp);
|
||||
}
|
||||
}
|
||||
rc = capiconn_accept(cp, bch->cfg.proto.b1, bch->cfg.proto.b2, bch->cfg.proto.b3,
|
||||
0, 0, 0, (uint8_t *)bch->cfg.ncpi);
|
||||
if (rc != CAPICONN_OK) {
|
||||
if (cst->bch->ops.fini)
|
||||
cst->bch->ops.fini(cst);
|
||||
talloc_free(cst);
|
||||
capiconn_reject(cp);
|
||||
}
|
||||
capiconn_setpriv(cp, cst);
|
||||
} else
|
||||
capiconn_ignore(cp);
|
||||
}
|
||||
|
@ -91,7 +133,9 @@ static void cb_connected(capi_connection *cp, _cstruct NCPI)
|
|||
/* user plane data received */
|
||||
static void cb_datareceived(capi_connection *cp, unsigned char *data, unsigned int len)
|
||||
{
|
||||
struct call_state *cst = capiconn_getpriv(cp);
|
||||
LOGP(DCAPI, LOGL_DEBUG, "%s(%p, %u)\n", __func__, data, len);
|
||||
cst->bch->ops.rx_data(cst, data, len);
|
||||
}
|
||||
|
||||
/* sent user plane data was confirmed */
|
||||
|
@ -105,7 +149,8 @@ static void cb_datasent(capi_connection *cp, unsigned char *data)
|
|||
static void cb_put_message(unsigned int appid, unsigned char *msg)
|
||||
{
|
||||
int rc;
|
||||
//LOGP(DCAPI, LOGL_DEBUG, "%s(%u)\n", __func__, appid);
|
||||
const char *str = capi20_cmd2str(CAPIMSG_COMMAND(msg), CAPIMSG_SUBCOMMAND(msg));
|
||||
LOGP(DCAPI, LOGL_DEBUG, "Tx to CAPI: %s\n", str);
|
||||
rc = capi20_put_message(appid, msg);
|
||||
if (rc)
|
||||
fprintf(stderr, "capi20_put_message: %s\n", capi_info2str(rc));
|
||||
|
@ -138,7 +183,7 @@ static void cb_errmsg(const char *fmt, ...)
|
|||
LOGPC(DCAPI, LOGL_ERROR, "\n");
|
||||
}
|
||||
|
||||
capiconn_callbacks callbacks = {
|
||||
static capiconn_callbacks callbacks = {
|
||||
.malloc = cb_malloc,
|
||||
.free = cb_free,
|
||||
|
||||
|
@ -160,6 +205,11 @@ capiconn_callbacks callbacks = {
|
|||
* initialization / integration
|
||||
***********************************************************************/
|
||||
|
||||
int bchan_call_tx(struct call_state *cst, const uint8_t *data, size_t len)
|
||||
{
|
||||
return capiconn_send(cst->cc, (uint8_t *)data, len);
|
||||
}
|
||||
|
||||
/* debug print callback for capi20 to log via libosmocore logging framework */
|
||||
static int cb_capi_dprintf(const char *file, int line, const char *func, const char *fmt, va_list va)
|
||||
{
|
||||
|
@ -255,6 +305,8 @@ int main(int argc, char **argv)
|
|||
osmo_init_logging2(ctx, &log_info);
|
||||
capi_init(ctx);
|
||||
|
||||
bchan_route_add(-1, NULL, "raw_loop");
|
||||
|
||||
while (1) {
|
||||
osmo_select_main(0);
|
||||
}
|
||||
|
|
15
capiconn.c
15
capiconn.c
|
@ -118,6 +118,9 @@ struct capi_contr {
|
|||
} *ackqueue;
|
||||
int ackqueuelen;
|
||||
} *nccip;
|
||||
|
||||
/* application private state */
|
||||
void *priv;
|
||||
} *connections;
|
||||
};
|
||||
|
||||
|
@ -1789,3 +1792,15 @@ capiconn_listenstate(capiconn_context *ctx, unsigned contr)
|
|||
return CAPICONN_WRONG_STATE;
|
||||
return CAPICONN_OK;
|
||||
}
|
||||
|
||||
void
|
||||
capiconn_setpriv(capi_connection *cp, void *priv)
|
||||
{
|
||||
cp->priv = priv;
|
||||
}
|
||||
|
||||
void *
|
||||
capiconn_getpriv(capi_connection *cp)
|
||||
{
|
||||
return cp->priv;
|
||||
}
|
||||
|
|
|
@ -432,4 +432,9 @@ int capiconn_listen(capiconn_context *ctx,
|
|||
*/
|
||||
int capiconn_listenstate(capiconn_context *ctx, unsigned contr);
|
||||
|
||||
|
||||
/* get/set private reference in connection */
|
||||
void capiconn_setpriv(capi_connection *cp, void *priv);
|
||||
void *capiconn_getpriv(capi_connection *cp);
|
||||
|
||||
#endif /* __CAPICONN_H__ */
|
||||
|
|
|
@ -0,0 +1,40 @@
|
|||
|
||||
#include "bchan.h"
|
||||
|
||||
static int raw_loop_init(struct call_state *cst)
|
||||
{
|
||||
/* no private data to allocate */
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void raw_loop_rx(struct call_state *cst, const uint8_t *data, uint8_t len)
|
||||
{
|
||||
/* echo whatever we received */
|
||||
bchan_call_tx(cst, data, len);
|
||||
}
|
||||
|
||||
static void raw_loop_fini(struct call_state *cst)
|
||||
{
|
||||
/* no private data to free */
|
||||
}
|
||||
|
||||
|
||||
static struct bchan_handler bch_raw_loop = {
|
||||
.name = "raw_loop",
|
||||
.cfg = {
|
||||
.proto = { 1, 1, 0 },
|
||||
.ncpi = NULL,
|
||||
.max_b_data_blocks = 10,
|
||||
.max_b_data_len = 32,
|
||||
},
|
||||
.ops = {
|
||||
.init = raw_loop_init,
|
||||
.rx_data = raw_loop_rx,
|
||||
.fini = raw_loop_fini,
|
||||
},
|
||||
};
|
||||
|
||||
static __attribute__((constructor)) void hldr_raw_init(void)
|
||||
{
|
||||
bchan_handler_register(&bch_raw_loop);
|
||||
}
|
Loading…
Reference in New Issue