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remsim-client: Call an external script in specific situations 

There are some situations where remsim-client would want to make its
surrounding system aware of, e.g. to take specific action.

This is particularly important on platforms where the simtrace2 firmware
doesn't have direct control over modem reset/poweron or the like.

Change-Id: I61cf4d93c669db137de801f8b147dcffaa6f3abd
Depends: libosmocore.git Ib24ac8a083db32e55402ce496a5eabd8749cc888
Closes: OS#4332
This commit is contained in:
Harald Welte 2019-12-17 01:14:43 +01:00
parent 499e1d90b5
commit 55c7f44194
2 changed files with 141 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
doc/manuals/chapters/remsim-client.adoc
View File

@ -82,6 +82,10 @@ osmo-remsim-client-st2 currently has the following command-line options:
Specify the initial ATR to be communicated to the modem/phone. Can
and will later be overridden by the ATR as specified by
`osmo-remsim-bankd` once a card has been mapped to this client.
*-e, --event-script COMMAND*::
Specify the shell command to be execute when the client wants to call its
helper script
==== Examples
.remsim-server is on 10.2.3.4, sysmoQMOD on usb bus, all 4 modems:
@ -97,3 +101,55 @@ osmo-remsim-client-st2 -s 10.2.3.4 -V 1d50 -P 4004 -C 1 -I 1 -H 2-1.4 -c 0 -n 3
`osmo-remsim-client` currently logs to stdout only, and the logging
verbosity is not yet configurable. However, as the libosmocore logging
framework is used, extending this is an easy modification.
=== Helper Script
`osmo-remsim-client` can call an external shell command / script / program at specific
instances of time. This serves two purposes:
* To keep external system integration posted about the overall status of remsim-client,
such as whether or not it is connected to a server and/or bankd.
* To request the external system to perform specific actions, such as triggering the reset
of the modem - in case the hardware doesn't allow the simtrace2 firmware to do that itself.
==== Script Environment Variables
The environment passed to the helper script contains a number of variables to provide inormation
to the external script:
.Environment Variables
[options="header",cols="27%,18%,55%"]
|===
| Name | Example Value | Description
| REMSIM_CLIENT_VERSION | 0.2.2.37-5406a | Compile version of the software
| REMSIM_SERVER_ADDR | 1.2.3.4:1234 | Address and port of the remsim-server
| REMSIM_SERVER_STATE | CONNECTED | FSM state of the connection to remsim-server
| REMSIM_BANKD_ADDR | 1.2.3.4:1234 | Address and port of the remsim-bankd
| REMSIM_BANKD_STATE | CONNECTED | FSM state of the connection to remsim-bankd
| REMSIM_CLIENT_SLOT | 23:42 | Client ID and Client Slot Number
| REMSIM_BANKD_SLOT | 55:33 | Bank ID and Bank Slot Number
| REMSIM_USB_PATH | 2-1.1 | USB path of the USB device with simtrace2 cardem firmware
| REMSIM_USB_INTERFACE | 1 | Interface number of the USB device with simtrace2 cardem firmware
| REMSIM_SIM_VCC | 1 | Whether or not the modem currently applies SIM VCC (0/1)
| REMSIM_SIM_RST | 1 | Whether or not the modem currently asserts SIM RST (0=inactive, 1=active)
| REMSIM_CAUSE | request-card-insert | The cause why this script has been called
|===
==== REMSIM_CAUSE values
The REMSIM_CAUSE environment variable (as well as the first argument) passed to the helper
script indicated why the script has been called.
[options="header",cols="25%,75%"]
|===
| Name | Description
| event-modem-status | The SIM card interface status has changed (e.g. VCC/RST change)
| event-bankd-connect | A logical RSPRO connection to a bankd has been established
| event-server-connect | A logical RSPRO connection to a server has been established
| event-config-bankd | The server has instructed the client of the bankd address
| request-card-insert | The client asks the system to simulate SIM card insertion to the modem
| request-card-remove | The client asks the system to simulate SIM card removal from the modem
| request-sim-remote | The client asks the system to switch to remote SIM
| request-sim-local | The client asks the system to switch to local SIM
| request-modem-reset | The client asks the system to perform a modem reset
|===

86
src/client/simtrace2-remsim_client.c
View File

@ -32,6 +32,7 @@
#include <osmocom/core/utils.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/application.h>
#include <osmocom/core/exec.h>
#include <osmocom/abis/ipa.h>
#include <osmocom/gsm/protocol/ipaccess.h>
@ -130,6 +131,77 @@ __attribute__((unused)) static int gsmtap_send_sim(const uint8_t *apdu, unsigned
return 0;
}
/* build the (additional) environment for executing a script */
static char **build_script_env(struct bankd_client *clnt, const char *cause)
{
struct cardem_inst *ci = clnt->cardem;
char **env = talloc_zero_size(clnt, 256*sizeof(char *));
int i = 0;
if (!env)
return NULL;
env[i++] = talloc_asprintf(env, "REMSIM_CLIENT_VERSION=%s", VERSION);
env[i++] = talloc_asprintf(env, "REMSIM_SERVER_ADDR=%s:%u",
clnt->srv_conn.server_host, clnt->srv_conn.server_port);
env[i++] = talloc_asprintf(env, "REMSIM_SERVER_STATE=%s",
osmo_fsm_inst_state_name(clnt->srv_conn.fi));
env[i++] = talloc_asprintf(env, "REMSIM_BANKD_ADDR=%s:%u",
clnt->bankd_conn.server_host, clnt->bankd_conn.server_port);
env[i++] = talloc_asprintf(env, "REMSIM_BANKD_STATE=%s",
osmo_fsm_inst_state_name(clnt->bankd_conn.fi));
if (clnt->srv_conn.clslot) {
env[i++] = talloc_asprintf(env, "REMSIM_CLIENT_SLOT=%lu:%lu",
g_client->srv_conn.clslot->clientId,
g_client->srv_conn.clslot->slotNr);
}
env[i++] = talloc_asprintf(env, "REMSIM_BANKD_SLOT=%u:%u",
clnt->bankd_slot.bank_id, clnt->bankd_slot.slot_nr);
env[i++] = talloc_asprintf(env, "REMSIM_USB_PATH=%s", ci->usb_path);
env[i++] = talloc_asprintf(env, "REMSIM_USB_INTERFACE=%u", clnt->cfg->usb.if_num);
/* TODO: SIM card state VCC/CLK/RST */
env[i++] = talloc_asprintf(env, "REMSIM_SIM_VCC=%u",
!!(ci->last_status.flags & CEMU_STATUS_F_VCC_PRESENT));
env[i++] = talloc_asprintf(env, "REMSIM_SIM_RST=%u",
!!(ci->last_status.flags & CEMU_STATUS_F_RESET_ACTIVE));
env[i++] = talloc_asprintf(env, "REMSIM_CAUSE=%s", cause);
/* terminate last entry */
env[i++] = NULL;
return env;
}
static int call_script(struct bankd_client *clnt, const char *cause)
{
char **env, *cmd;
int rc;
if (!clnt->cfg->event_script)
return 0;
env = build_script_env(clnt, cause);
if (!env)
return -ENOMEM;
cmd = talloc_asprintf(env, "%s %s", clnt->cfg->event_script, cause);
if (!cmd) {
talloc_free(env);
return -ENOMEM;
}
rc = osmo_system_nowait(cmd, osmo_environment_whitelist, env);
talloc_free(env);
return rc;
}
/***********************************************************************
* SIMTRACE core protocol
***********************************************************************/
@ -548,6 +620,7 @@ static int process_irq_status(struct cardem_inst *ci, const uint8_t *buf, int le
if (ci->last_status.flags != status->flags) {
ci->last_status = *status;
call_script(g_client, "event-modem-status");
} else
ci->last_status = *status;
@ -754,6 +827,7 @@ static int bankd_handle_rx(struct rspro_server_conn *bankdc, const RsproPDU_t *p
/* Store 'identity' of bankd to in peer_comp_id */
rspro_comp_id_retrieve(&bankdc->peer_comp_id, &pdu->msg.choice.connectClientRes.identity);
osmo_fsm_inst_dispatch(bankdc->fi, SRVC_E_CLIENT_CONN_RES, (void *) pdu);
call_script(g_client, "event-bankd-connect");
break;
case RsproPDUchoice_PR_tpduCardToModem: // APDU response from card received
bankd_handle_tpduCardToModem(g_client, pdu);
@ -780,6 +854,7 @@ static int srvc_handle_rx(struct rspro_server_conn *srvc, const RsproPDU_t *pdu)
/* Store 'identity' of server in srvc->peer_comp_id */
rspro_comp_id_retrieve(&srvc->peer_comp_id, &pdu->msg.choice.connectClientRes.identity);
osmo_fsm_inst_dispatch(srvc->fi, SRVC_E_CLIENT_CONN_RES, (void *) pdu);
call_script(g_client, "event-server-connect");
break;
case RsproPDUchoice_PR_configClientIdReq:
/* store/set the clientID as instructed by the server */
@ -804,6 +879,7 @@ static int srvc_handle_rx(struct rspro_server_conn *srvc, const RsproPDU_t *pdu)
/* send response to server */
resp = rspro_gen_ConfigClientBankRes(ResultCode_ok);
server_conn_send_rspro(srvc, resp);
call_script(g_client, "event-config-bankd");
break;
default:
LOGPFSML(srvc->fi, LOGL_ERROR, "Unknown/Unsupported RSPRO PDU type: %s\n",
@ -847,6 +923,7 @@ static void print_help(void)
"\t-A\t--usb-address\tADDRESS\n"
"\t-H\t--usb-path\tPATH\n"
"\t-a\t--atr\tATR\n"
"\t-e\t--event-script\tPATH\n"
"\n"
);
}
@ -898,6 +975,7 @@ static void handle_options(struct client_config *cfg, int argc, char **argv)
{ "usb-address", 1, 0, 'A' },
{ "usb-path", 1, 0, 'H' },
{ "atr", 1, 0, 'a' },
{ "event-script", 1, 0, 'e' },
{ NULL, 0, 0, 0 }
};
int c, rc;
@ -905,7 +983,7 @@ static void handle_options(struct client_config *cfg, int argc, char **argv)
while (1) {
int option_index = 0;
c = getopt_long(argc, argv, "s:p:c:n:hvi:kV:P:C:I:S:A:H:a:", opts, &option_index);
c = getopt_long(argc, argv, "s:p:c:n:hvi:kV:P:C:I:S:A:H:a:e:", opts, &option_index);
if (c == -1)
break;
switch (c) {
@ -964,6 +1042,9 @@ static void handle_options(struct client_config *cfg, int argc, char **argv)
}
cfg->atr.len = rc;
break;
case 'e':
osmo_talloc_replace_string(cfg, &cfg->event_script, optarg);
break;
}
}
@ -1062,9 +1143,11 @@ static void main_body(struct cardem_inst *ci, struct client_config *cfg)
/* simulate card-insert to modem (owhw, not qmod) */
cardem_request_card_insert(ci, true);
call_script(g_client, "request-card-insert");
/* select remote (forwarded) SIM */
st_modem_sim_select_remote(ci->slot);
call_script(g_client, "request-sim-remote");
/* set the ATR */
//atr_update_csum(real_atr, sizeof(real_atr));
@ -1072,6 +1155,7 @@ static void main_body(struct cardem_inst *ci, struct client_config *cfg)
/* select remote (forwarded) SIM */
st_modem_reset_pulse(ci->slot, 300);
call_script(g_client, "request-modem-reset");
printf("Entering main loop\n");