160 lines
3.7 KiB
C
160 lines
3.7 KiB
C
#include <errno.h>
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#include <unistd.h>
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#include <osmocom/core/select.h>
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#include "client.h"
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/* This is a remsim-client with an interactive 'shell', where the user
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* can type in C-APDUs in hex formats, which will be sent to the bankd /
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* SIM-card. Responses received from SIM Card via bankd will be printed
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* in return. */
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/***********************************************************************
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* stdin frontend code to remsim-client
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***********************************************************************/
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int frontend_request_card_insert(struct bankd_client *bc)
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{
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return 0;
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}
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int frontend_request_sim_remote(struct bankd_client *bc)
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{
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return 0;
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}
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int frontend_request_modem_reset(struct bankd_client *bc)
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{
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return 0;
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}
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int frontend_handle_card2modem(struct bankd_client *bc, const uint8_t *data, size_t len)
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{
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OSMO_ASSERT(data);
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printf("R-APDU: %s\n", osmo_hexdump(data, len));
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fflush(stdout);
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return 0;
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}
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int frontend_handle_set_atr(struct bankd_client *bc, const uint8_t *data, size_t len)
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{
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OSMO_ASSERT(data);
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printf("SET_ATR: %s\n", osmo_hexdump(data, len));
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fflush(stdout);
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return 0;
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}
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int frontend_handle_slot_status(struct bankd_client *bc, const SlotPhysStatus_t *sts)
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{
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return 0;
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}
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int frontend_append_script_env(struct bankd_client *bc, char **env, int idx, size_t max_env)
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{
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return idx;
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}
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/***********************************************************************
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* Incoming command from the user application (stdin shell in our case)
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***********************************************************************/
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struct stdin_state {
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struct osmo_fd ofd;
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struct msgb *rx_msg;
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struct bankd_client *bc;
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};
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/* called every time a command on stdin was received */
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static void handle_stdin_command(struct stdin_state *ss, char *cmd)
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{
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struct bankd_client *bc = ss->bc;
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RsproPDU_t *pdu;
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BankSlot_t bslot;
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uint8_t buf[1024];
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int rc;
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bank_slot2rspro(&bslot, &bc->bankd_slot);
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OSMO_ASSERT(ss->rx_msg);
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if (!strcasecmp(cmd, "RESET")) {
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/* reset the [remote] card */
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pdu = rspro_gen_ClientSlotStatusInd(bc->srv_conn.clslot, &bslot,
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true, false, false, true);
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server_conn_send_rspro(&bc->bankd_conn, pdu);
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} else {
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/* we assume the user has entered a C-APDU as hex string. parse + send */
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rc = osmo_hexparse(cmd, buf, sizeof(buf));
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if (rc < 0) {
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fprintf(stderr, "ERROR parsing C-APDU `%s'!\n", cmd);
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return;
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}
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if (!bc->srv_conn.clslot) {
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fprintf(stderr, "Cannot send command; no client slot\n");
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return;
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}
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/* Send CMD APDU to [remote] card */
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pdu = rspro_gen_TpduModem2Card(bc->srv_conn.clslot, &bslot, buf, rc);
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server_conn_send_rspro(&bc->bankd_conn, pdu);
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}
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}
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/* call-back function for stdin read. Gather bytes in buffer until CR/LF received */
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static int stdin_fd_cb(struct osmo_fd *ofd, unsigned int what)
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{
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struct stdin_state *ss = ofd->data;
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char *cur;
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int rc, i;
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OSMO_ASSERT(what & OSMO_FD_READ);
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if (!ss->rx_msg) {
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ss->rx_msg = msgb_alloc(1024, "stdin");
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OSMO_ASSERT(ss->rx_msg);
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}
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cur = (char *) ss->rx_msg->tail;
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rc = read(ofd->fd, cur, msgb_tailroom(ss->rx_msg));
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if (rc < 0)
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return rc;
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msgb_put(ss->rx_msg, rc);
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for (i = 0; i < rc; i++) {
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if (cur[i] == '\r' || cur[i] == '\n') {
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cur[i] = '\0';
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/* dispatch the command */
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handle_stdin_command(ss, cur);
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/* FIXME: possibly other commands */
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msgb_free(ss->rx_msg);
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ss->rx_msg = NULL;
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}
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}
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return 0;
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}
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/* main function */
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int client_user_main(struct bankd_client *bc)
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{
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struct stdin_state ss;
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/* register stdin file descriptor with osmocom select loop abstraction */
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memset(&ss, 0, sizeof(ss));
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osmo_fd_setup(&ss.ofd, fileno(stdin), OSMO_FD_READ, &stdin_fd_cb, &ss, 0);
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osmo_fd_register(&ss.ofd);
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ss.bc = bc;
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while (1) {
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osmo_select_main(0);
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}
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}
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