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-rw-r--r--Makefile3
-rw-r--r--vw-bap-dump.c377
2 files changed, 380 insertions, 0 deletions
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..c6b032c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,3 @@
+CFLAGS += -Wall -g
+
+vw-bap-dump:
diff --git a/vw-bap-dump.c b/vw-bap-dump.c
new file mode 100644
index 0000000..605cf36
--- /dev/null
+++ b/vw-bap-dump.c
@@ -0,0 +1,377 @@
+/*
+ * Copyright 2017 Max Staudt
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <ctype.h>
+
+#include <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <linux/can.h>
+#include <linux/can/raw.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <endian.h>
+#include <sys/time.h>
+
+
+
+
+typedef unsigned char BAP_OpCode;
+typedef unsigned char BAP_SubNode;
+typedef unsigned char BAP_SubFunction;
+typedef unsigned short BAP_FrameLen;
+
+
+struct BAP_Frame {
+ BAP_OpCode opcode;
+ BAP_SubNode subnode;
+ BAP_SubFunction function;
+ BAP_FrameLen len;
+ BAP_FrameLen len_done;
+ char data[4096];
+};
+
+
+struct BAP_RXer {
+ struct BAP_Frame *mfchannel[8];
+};
+
+
+
+
+
+static void bap_frame_dump(struct BAP_Frame *bap_frame)
+{
+ unsigned i;
+
+ printf("%u. %2i/%-2i .%02i --",
+ bap_frame->opcode,
+ bap_frame->subnode,
+ bap_frame->function,
+ bap_frame->len);
+
+ for (i = 0; i < bap_frame->len; i++) {
+ if (!(i % 4)) {
+ printf(" ");
+ }
+ printf("%02x", (unsigned char)(bap_frame->data[i]));
+ }
+
+ printf("\n '");
+ for (i = 0; i < bap_frame->len; i++) {
+ unsigned char c = bap_frame->data[i];
+ if (!isprint(c) || c == '\n' || c == '\r') {
+ c = '.';
+ }
+ printf("%c", c);
+ }
+ printf("'");
+
+ printf("\n");
+
+ fflush(stdout);
+}
+
+
+
+
+
+static struct BAP_Frame* bap_handle_can_frame(struct BAP_RXer *bap, struct can_frame *frame)
+{
+ struct BAP_Frame *bap_frame = NULL;
+ unsigned short header;
+ unsigned this_len;
+
+ //printf("Received BAP frame from CAN ID %03x\n", frame->can_id);
+
+ if (frame->can_dlc < 2) {
+ printf("Error: Frame too short\n");
+ }
+
+ if (frame->data[0] & 0x80) {
+ /* This is a multi-frame BAP message */
+ int mfchannel = (frame->data[0] >> 4) & 0x3;
+
+ if (!(frame->data[0] & 0x40)) {
+ /* Start frame */
+
+ unsigned short header;
+ unsigned this_len;
+
+ if (frame->can_dlc < 4) {
+ printf("Error: Frame too short\n");
+ }
+
+ if (bap->mfchannel[mfchannel]) {
+ printf("bap_handle_can_frame: new start frame for open channel\n");
+ }
+ bap->mfchannel[mfchannel] = NULL;
+
+ bap_frame = calloc(1, sizeof(struct BAP_Frame));
+ if (!bap_frame) {
+ printf("bap_handle_can_frame: Failed to allocate new frame\n");
+ return NULL;
+ }
+
+ header = (frame->data[2] << 8) | frame->data[3];
+ bap_frame->opcode = (header >> 12) & 0x7;
+ bap_frame->subnode = (header >> 6) & 0x3F;
+ bap_frame->function = (header >> 0) & 0x3F;
+
+ bap_frame->len = ((frame->data[0] & 0xF) << 8) | frame->data[1];
+
+ this_len = frame->can_dlc - 4;
+
+ if (this_len > bap_frame->len) {
+ printf("bap_handle_can_frame: this_len > len\n");
+
+ free(bap_frame);
+ bap->mfchannel[mfchannel] = NULL;
+
+ return NULL;
+ }
+
+ memcpy(&bap_frame->data[0], &frame->data[frame->can_dlc - this_len], this_len);
+ bap_frame->len_done = this_len;
+
+ if (bap_frame->len_done == bap_frame->len) {
+ /* Frame is complete, remove from buffer */
+ bap->mfchannel[mfchannel] = NULL;
+ return bap_frame;
+ } else {
+ /* Frame is incomplete, don't emit it yet */
+ bap->mfchannel[mfchannel] = bap_frame;
+ return NULL;
+ }
+ } else {
+ /* Continuation frame */
+
+ bap_frame = bap->mfchannel[mfchannel];
+
+ if (!bap_frame) {
+ printf("bap_handle_can_frame: continuation frame for unknown mf channel %d\n",
+ mfchannel);
+ }
+
+ this_len = frame->can_dlc - 1;
+
+ if ((bap_frame->len_done + this_len) > bap_frame->len) {
+ printf("bap_handle_can_frame: len_done + this_len > len\n");
+
+ free(bap_frame);
+ bap->mfchannel[mfchannel] = NULL;
+
+ return NULL;
+ }
+
+ memcpy(&bap_frame->data[bap_frame->len_done],
+ &frame->data[frame->can_dlc - this_len],
+ this_len);
+ bap_frame->len_done += this_len;
+
+ if (bap_frame->len_done == bap_frame->len) {
+ /* Frame is complete, remove from buffer */
+ bap->mfchannel[mfchannel] = NULL;
+ return bap_frame;
+ } else {
+ /* Frame is incomplete, don't emit it yet */
+ return NULL;
+ }
+ }
+ } else {
+ /* Single-frame BAP message */
+
+ bap_frame = calloc(1, sizeof(struct BAP_Frame));
+ if (!bap_frame) {
+ printf("bap_handle_can_frame: Failed to allocate new frame\n");
+ return NULL;
+ }
+
+ header = (frame->data[0] << 8) | frame->data[1];
+ bap_frame->opcode = (header >> 12) & 0x7;
+ bap_frame->subnode = (header >> 6) & 0x3F;
+ bap_frame->function = (header >> 0) & 0x3F;
+
+ this_len = frame->can_dlc - 2;
+
+ bap_frame->len = this_len;
+
+ memcpy(&bap_frame->data[0], &frame->data[frame->can_dlc - this_len], this_len);
+ bap_frame->len_done = this_len;
+
+ return bap_frame;
+ }
+}
+
+
+
+
+
+static int net_init(char *ifname)
+{
+ int s;
+ int recv_own_msgs;
+ struct sockaddr_can addr;
+ struct ifreq ifr;
+
+ s = socket(PF_CAN, SOCK_RAW, CAN_RAW);
+ if (s < 0) {
+ perror("socket");
+ exit(1);
+ }
+
+ /* Convert interface name to index */
+ memset(&ifr.ifr_name, 0, sizeof(ifr.ifr_name));
+ strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
+ if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
+ perror("SIOCGIFINDEX");
+ exit(1);
+ }
+
+ /* Open the CAN interface */
+ memset(&addr, 0, sizeof(addr));
+ addr.can_family = AF_CAN;
+ addr.can_ifindex = ifr.ifr_ifindex;
+ if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+ perror("bind");
+ return 0;
+ }
+
+ recv_own_msgs = 1; /* 0 = disabled (default), 1 = enabled */
+ setsockopt(s, SOL_CAN_RAW, CAN_RAW_RECV_OWN_MSGS,
+ &recv_own_msgs, sizeof(recv_own_msgs));
+
+ return s;
+}
+
+
+
+static struct BAP_RXer* bap_alloc()
+{
+ struct BAP_RXer *bap;
+
+ bap = calloc(1, sizeof(*bap));
+ if (!bap) {
+ return NULL;
+ }
+
+ return bap;
+}
+
+
+
+
+static void bap_free(struct BAP_RXer *bap)
+{
+ /* TODO */
+ free(bap);
+}
+
+
+
+static void bap_frame_free(struct BAP_Frame *bap_frame)
+{
+ /* TODO */
+ free(bap_frame);
+}
+
+
+
+
+
+int main(int argc, char **argv)
+{
+ fd_set rdfs;
+ int s;
+ int i;
+ int can_id_count;
+ unsigned *can_ids;
+ struct BAP_RXer **baps;
+
+ if (argc < 3) {
+ printf("syntax: %s IFNAME CAN_ID [CAN_ID CAN_ID ...]\n", argv[0]);
+ return 1;
+ }
+
+ can_id_count = argc - 2;
+
+ can_ids = calloc(can_id_count, sizeof(*can_ids));
+ baps = calloc(can_id_count, sizeof(*baps));
+ if (!can_ids || !baps) {
+ printf("Out of memory allocating meta structs.\n");
+ return 1;
+ }
+
+ for (i = 0; i < can_id_count; i++) {
+ can_ids[i] = strtoul(argv[2 + i], NULL, 0);
+ baps[i] = bap_alloc();
+ if (!baps[i]) {
+ printf("Out of memory allocating BAP struct.\n");
+ return 1;
+ }
+
+ printf("Listening for CAN ID: %x\n", can_ids[i]);
+ }
+
+
+ s = net_init(argv[1]);
+
+ while (1) {
+ int retval;
+
+ FD_ZERO(&rdfs);
+ FD_SET(s, &rdfs);
+
+ retval = select(s+1, &rdfs, NULL, NULL, NULL);
+ /* We currently rely on Linux timeout behavior here,
+ * i.e. the timeout now reflects the remaining time */
+ if (retval < 0) {
+ perror("select");
+ return 1;
+ } else if (!retval) {
+ /* Timeout, we NEED to check this first */
+ } else if (FD_ISSET(s, &rdfs)) {
+ struct can_frame frame;
+ ssize_t ret;
+
+ ret = read(s, &frame, sizeof(frame));
+ if (ret < 0) {
+ perror("read from CAN socket");
+ return 1;
+ }
+
+ for (i = 0; i < can_id_count; i++) {
+ if (can_ids[i] == frame.can_id) {
+ struct BAP_Frame *bap_frame;
+ struct BAP_RXer *bap = baps[i];
+
+ bap_frame = bap_handle_can_frame(bap, &frame);
+ if (bap_frame) {
+ printf("%03x: ", frame.can_id);
+ bap_frame_dump(bap_frame);
+ bap_frame_free(bap_frame);
+ }
+
+ break;
+ }
+ }
+
+ continue;
+ }
+ }
+
+ /* TODO: Free */
+
+ close(s);
+
+ return 0;
+}
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