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ensure usb_msg_hdr contains raw message length

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we want to ensure that the length of every (current or future) message
can be determined by looking at cardemu_usb_msg_hdr.msg_len, rather than
having a length that is relative to the respective specific command.
This commit is contained in:
Harald Welte
2016-03-18 21:01:36 +01:00
parent b8f9450c18
commit d295b92192
4 changed files with 21 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
firmware/src_simtrace/card_emu.c
View File

@@ -174,7 +174,8 @@ static void flush_rx_buffer(struct card_handle *ch)
/* store length of data payload fild in header */
rd = (struct cardemu_usb_msg_rx_data *) rctx->data;
rd->hdr.data_len = rctx->idx;
rd->data_len = rctx->idx;
rd->hdr.msg_len = sizeof(*rd) + rd->data_len;
llist_add_tail(&rctx->list, &ch->usb_tx_queue);
req_ctx_set_state(rctx, RCTX_S_USB_TX_PENDING);
@@ -229,7 +230,8 @@ static void flush_pts(struct card_handle *ch)
ptsi = (struct cardemu_usb_msg_pts_info *) rctx->data;
ptsi->hdr.msg_type = CEMU_USB_MSGT_DO_PTS;
ptsi->hdr.data_len = serialize_pts(ptsi->req, ch->pts.req);
ptsi->hdr.msg_len = sizeof(*ptsi);
ptsi->pts_len = serialize_pts(ptsi->req, ch->pts.req);
serialize_pts(ptsi->resp, ch->pts.resp);
llist_add_tail(&rctx->list, &ch->usb_tx_queue);
@@ -701,7 +703,7 @@ static int tx_byte_tpdu(struct card_handle *ch)
}
/* check if the buffer has now been fully transmitted */
if ((rctx->idx >= td->hdr.data_len) ||
if ((rctx->idx >= td->data_len) ||
(td->data + rctx->idx >= rctx->data + rctx->tot_len)) {
if (td->flags & CEMU_DATA_F_PB_AND_RX) {
/* we have just sent the procedure byte and now

14
firmware/src_simtrace/cardemu_prot.h
View File

@@ -43,7 +43,8 @@ enum cardemu_usb_msg_type {
struct cardemu_usb_msg_hdr {
uint8_t msg_type; /* enum cardemu_usb_msg_type */
uint8_t seq_nr; /* sequence number */
uint16_t data_len; /* length of optional data field */
uint16_t msg_len; /* length of message including hdr */
uint8_t data[0];
} __attribute__ ((packed));
/* indicates a TPDU header is present in this message */
@@ -64,7 +65,8 @@ struct cardemu_usb_msg_cardinsert {
/* CEMU_USB_MSGT_DT_SET_ATR */
struct cardemu_usb_msg_set_atr {
struct cardemu_usb_msg_hdr hdr;
/* variable-length ATR data (hdr.data_len) */
uint8_t atr_len;
/* variable-length ATR data */
uint8_t atr[0];
} __attribute__ ((packed));
@@ -72,7 +74,8 @@ struct cardemu_usb_msg_set_atr {
struct cardemu_usb_msg_tx_data {
struct cardemu_usb_msg_hdr hdr;
uint32_t flags;
/* variable-length TPDU data (hdr.data_len) */
uint16_t data_len;
/* variable-length TPDU data */
uint8_t data[0];
} __attribute__ ((packed));
@@ -80,7 +83,8 @@ struct cardemu_usb_msg_tx_data {
struct cardemu_usb_msg_rx_data {
struct cardemu_usb_msg_hdr hdr;
uint32_t flags;
/* variable-length TPDU data (hdr.data_len) */
uint16_t data_len;
/* variable-length TPDU data */
uint8_t data[0];
} __attribute__ ((packed));
@@ -105,6 +109,7 @@ struct cardemu_usb_msg_status {
/* CEMU_USB_MSGT_DO_PTS */
struct cardemu_usb_msg_pts_info {
struct cardemu_usb_msg_hdr hdr;
uint8_t pts_len;
/* PTS request as sent from reader */
uint8_t req[6];
/* PTS response as sent by card */
@@ -117,6 +122,7 @@ struct cardemu_usb_msg_error {
uint8_t severity;
uint8_t subsystem;
uint16_t code;
uint8_t msg_len;
/* human-readable error message */
uint8_t msg[0];
} __attribute__ ((packed));

2
firmware/src_simtrace/mode_cardemu.c
View File

@@ -305,7 +305,7 @@ static void dispatch_usb_command(struct req_ctx *rctx, struct cardem_inst *ci)
break;
case CEMU_USB_MSGT_DT_SET_ATR:
atr = (struct cardemu_usb_msg_set_atr *) hdr;
card_emu_set_atr(ci->ch, atr->atr, hdr->data_len);
card_emu_set_atr(ci->ch, atr->atr, atr->atr_len);
req_ctx_put(rctx);
break;
case CEMU_USB_MSGT_DT_CARDINSERT:

9
firmware/test/card_emu_tests.c
View File

@@ -140,7 +140,7 @@ static void dump_rctx(struct req_ctx *rctx)
case CEMU_USB_MSGT_DO_RX_DATA:
rxd = (struct cardemu_usb_msg_rx_data *)mh;
printf(" flags=%x, data=", rxd->flags);
for (i = 0; i < mh->data_len; i++)
for (i = 0; i < rxd->data_len; i++)
printf(" %02x", rxd->data[i]);
printf("\n");
break;
@@ -162,13 +162,13 @@ static void get_and_verify_rctx(int state, const uint8_t *data, unsigned int len
case RCTX_S_USB_TX_PENDING:
td = (struct cardemu_usb_msg_tx_data *) rctx->data;
assert(td->hdr.msg_type == CEMU_USB_MSGT_DO_RX_DATA);
assert(td->hdr.data_len == len);
assert(td->data_len == len);
assert(!memcmp(td->data, data, len));
break;
#if 0
case RCTX_S_UART_RX_PENDING:
rd = (struct cardemu_usb_msg_rx_data *) rctx->data;
assert(rd->hdr.data_len == len);
assert(rd->data_len == len);
assert(!memcmp(rd->data, data, len));
break;
#endif
@@ -229,8 +229,9 @@ static void host_to_device_data(const uint8_t *data, uint16_t len, unsigned int
cardemu_hdr_set(&rd->hdr, CEMU_USB_MSGT_DT_TX_DATA);
rd->flags = flags;
/* copy data and set length */
rd->hdr.data_len = len;
rd->data_len = len;
memcpy(rd->data, data, len);
rd->hdr.msg_len = sizeof(*rd) + len;
/* hand the req_ctx to the UART transmit code */
req_ctx_set_state(rctx, RCTX_S_UART_TX_PENDING);