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np_cli.c
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/*
* nisprog - Nissan ECU communications utility
*
* (c) 2014-2016 fenugrec
* Licensed under GPLv3
*
* the CLI commands are implemented in here.
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "stypes.h"
#include "diag.h"
#include "diag_l0.h"
#include "diag_l1.h"
#include "diag_l2.h"
#include "diag_os.h"
#include "diag_tty.h" //for setspeed
#include "diag_l2_iso14230.h" //needed to force header type (nisprog)
#include "scantool_cli.h"
#include "nisprog.h"
#include "nis_backend.h"
#include "npk_backend.h"
#include "ssm_backend.h"
#include "nissutils/cli_utils/nislib.h"
#include "nissutils/cli_utils/ecuid_list.h"
#include "npkern/iso_cmds.h"
#define CURFILE "np_cli.c" //XXXXX TODO: fix VS automagic macro setting
#define NPK_SPEED 62500 //bps default speed for npkern kernel
typedef long nparam_val; //type of .val member
/** simpler parameter unit than diag_cfgi */
struct nparam_t {
long val;
const char *shortname;
const char *descr;
long min;
long max; //validation : (val >= min) && (val <= max)
};
static struct nparam_t nparam_p3 = {.val = 5, .shortname = "p3", .descr = "P3 time before new request (ms)",
.min = 0, .max = 500};
static struct nparam_t nparam_rxe = {.val = 20, .shortname = "rxe", .descr = "Read timeout offset. Adjust to eliminate timeout errors",
.min = -20, .max = 500};
static struct nparam_t nparam_eepr = {.val = 0, .shortname = "eepr", .descr = "eeprom_read() function address",
.min = 0, .max = 2048L * 1024};
static struct nparam_t nparam_kspeed = {.val = NPK_SPEED, .shortname = "kspeed", .descr = "kernel comms speed used by \"initk\" command",
.min = 100, .max = 65000};
static struct nparam_t *nparams[] = {
&nparam_p3,
&nparam_rxe,
&nparam_eepr,
&nparam_kspeed,
NULL
};
struct nisecu_t nisecu;
/** some static data for in here only */
static struct keyset_t customkey;
/** fwd decls **/
static int npkern_init(void);
static int npk_dump(FILE *fpl, uint32_t start, uint32_t len, bool eep);
static int dump_fast(FILE *outf, const uint32_t start, uint32_t len);
static uint32_t read_ac(uint8_t *dest, uint32_t addr, uint32_t len);
static int npk_RMBA(uint8_t *dest, uint32_t addr, uint32_t len);
static bool set_keyset(u32 s27k);
/* called every time a parameter is changed from the UI.
* For some params, the value is only used in certain places,
* and therefore doesn't need to be handled in here
*/
static void update_params(void) {
if (global_l2_conn) {
global_l2_conn->diag_l2_p3min = (u16) nparam_p3.val;
global_l2_conn->diag_l2_p4min=0;
}
return;
}
/* npconf <paramname> <value>
*/
int cmd_npconf(int argc, char **argv) {
struct nparam_t *npt;
nparam_val tempval;
bool found = 0;
bool helping = 0;
if ((argc <= 1) || (argc > 3)) {
return CMD_USAGE;
}
if (argv[1][0] == '?') {
helping = 1;
printf("param\tvalue\tdescription\n");
}
// find param name in list
unsigned i;
for (i = 0; nparams[i]; i++) {
npt = nparams[i];
if (helping) {
printf("%s\t%ld\t%s\n", npt->shortname, npt->val, npt->descr);
continue;
}
if (strcmp(npt->shortname, argv[1]) == 0) {
found = 1;
break;
}
}
if (helping) {
return CMD_USAGE;
}
if (!found) {
printf("Unknown param \"%s\"\n", argv[1]);
return CMD_FAILED;
}
if (argc == 2) {
//no new value : just print current setting
printf("%s is currently %ld (0x%lX)\n", npt->shortname,
npt->val, npt->val);
return CMD_OK;
}
tempval = htoi(argv[2]);
if ((tempval < npt->min) || (tempval > npt->max)) {
printf("Error, requested value (%ld / 0x%lX) out of bounds !\n",
(long) tempval, (long) tempval);
return CMD_FAILED;
}
npt->val = tempval;
update_params();
printf("\t%s set to %ld (0x%lX).\n", argv[1], npt->val, npt->val);
return CMD_OK;
}
/* "dumpmem <file> <start> <len> [eep]" */
int cmd_dumpmem(int argc, char **argv) {
u32 start, len;
FILE *fpl;
bool eep = 0;
if (npstate == NP_DISC) {
printf("Not connected !\n");
return CMD_FAILED;
}
if ((argc < 4) || (argc > 5)) {
return CMD_USAGE;
}
if (argc == 5) {
if (strcmp("eep", argv[4]) == 0) {
eep = 1;
if (npstate != NP_NPKCONN) {
printf("Kernel must be running for reading EEPROM. Try \"runkernel\" or \"initk\"\n");
return CMD_FAILED;
}
if (!nparam_eepr.val) {
printf("Must set eeprom read function address first ! See \"npconf ?\"\n");
return CMD_FAILED;
}
if (set_eepr_addr((u32) nparam_eepr.val)) {
printf("could not set eep_read() address!\n");
return CMD_FAILED;
}
} else {
printf("did not recognize \"%s\"\n", argv[4]);
return CMD_FAILED;
}
}
//TODO : check for overwrite / append ?
if ((fpl = fopen(argv[1], "wb"))==NULL) {
printf("Cannot open %s !\n", argv[1]);
return CMD_FAILED;
}
start = (uint32_t) htoi(argv[2]);
len = (uint32_t) htoi(argv[3]);
if ((start == len) && (start == 0)) {
//special mode : dump all ROM as specified by device type.
const struct flashdev_t *fdt = nisecu.flashdev;
if (!fdt) {
printf("device type not set. Try setdev, or specify bounds manually.\n");
fclose(fpl);
return CMD_FAILED;
}
len = fdt->romsize;
}
/* Dispatch according to current state */
if (npstate == NP_NPKCONN) {
if (npk_dump(fpl, start, len, eep)) {
fclose(fpl);
return CMD_FAILED;
}
fclose(fpl);
return CMD_OK;
}
// npstate == NP_NORMALCONN:
if (dump_fast(fpl, start, len)) {
fclose(fpl);
return CMD_FAILED;
}
fclose(fpl);
return CMD_OK;
}
#define KEY_CANDIDATES 3
#define KEY_MAXDIST 10 //do not use keys that are way off
void autoselect_keyset(void) {
unsigned i;
u32 s27k;
struct ecuid_keymatch_t kcs[KEY_CANDIDATES];
ecuid_getkeys((const char *) nisecu.ecuid, kcs, KEY_CANDIDATES);
printf("Key candidate\tdist (smaller is better)\n");
for (i = 0; i < KEY_CANDIDATES; i++) {
printf("%u: 0x%08lX\t%d\n",i, (unsigned long) kcs[i].key, kcs[i].dist);
}
printf("\n");
// TODO : allow user selection
if (kcs[0].dist > KEY_MAXDIST) {
printf("ECUID matching was not conclusive, keyset unknown. Try gk or setkeys\n");
return;
}
s27k = kcs[0].key;
(void) set_keyset(s27k);
printf("Using best choice, SID27 key=%08lX. Use \"setkeys\" to change if required.\n",
(unsigned long) s27k);
return;
}
/* setdev <device_#> */
int cmd_setdev(int argc, char **argv) {
bool helping = 0;
unsigned idx;
const struct flashdev_t *fdt = nisecu.flashdev;
if (argc != 2) {
if (fdt) {
printf("current setting : %s\n", fdt->name);
}
return CMD_USAGE;
}
if (argv[1][0] == '?') {
helping = 1;
printf("\tname\tROM size\n");
}
for (idx=0; flashdevices[idx].name; idx++) {
if (helping) {
printf("\t%s\t%uk\n", flashdevices[idx].name, (unsigned) flashdevices[idx].romsize / 1024);
continue;
}
if (strcmp(flashdevices[idx].name, argv[1]) == 0) {
nisecu.flashdev = &flashdevices[idx];
printf("now using %s.\n", flashdevices[idx].name);
return CMD_OK;
}
}
if (helping) {
return CMD_USAGE;
}
printf("Invalid device, see list with \"setdev ?\"\n");
return CMD_FAILED;
}
/* setkeys <sid27key> [<sid36key1>] */
int cmd_setkeys(int argc, char **argv) {
const struct keyset_t *pks;
if (argc == 2) {
if (argv[1][0] == '?') {
return CMD_USAGE;
}
}
if ((argc < 2) || (argc > 3)) {
return CMD_USAGE;
}
u32 s27k = (u32) htoi(argv[1]);
customkey.s27k = s27k;
if (argc == 3) {
// use specified keys : don't lookup in known_keys[]
customkey.s36k1 = (u32) htoi(argv[2]);
nisecu.keyset = &customkey;
goto goodexit;
}
if (set_keyset(s27k)) {
goto goodexit;
}
printf("Does not match a known keyset; you will need to provide both s27 and s36 keys\n");
return CMD_FAILED;
goodexit:
pks = nisecu.keyset;
printf("Now using SID27 key=%08lX, SID36 key1=%08lX\n",
(unsigned long) pks->s27k, (unsigned long) pks->s36k1);
return CMD_OK;
}
int cmd_initk(int argc, char **argv) {
const char *npk_id;
(void) argv;
if (argc > 1) {
return CMD_USAGE;
}
if ((npstate == NP_DISC) ||
(global_state == STATE_IDLE)) {
printf("Error : not connected\n");
return CMD_FAILED;
}
if (npkern_init()) {
printf("npkern_init() error\n");
return CMD_FAILED;
}
npstate = NP_NPKCONN;
npk_id = get_npk_id();
if (npk_id) {
printf("Connected to kernel: %s\n", npk_id);
}
return CMD_OK;
}
int cmd_npconn(int argc, char **argv) {
(void) argv;
if (argc > 1) {
return CMD_USAGE;
}
if ((npstate != NP_DISC) ||
(global_state != STATE_IDLE)) {
printf("Error : already connected\n");
return CMD_FAILED;
}
nisecu_cleardata(&nisecu);
struct diag_l2_conn *d_conn;
struct diag_l0_device *dl0d = global_dl0d;
int rv;
flag_type flags = 0;
if (!dl0d) {
printf("No global L0. Please select + configure L0 first\n");
return CMD_FAILED;
}
if (global_cfg.L2proto != DIAG_L2_PROT_ISO14230) {
printf("L2 protocol must be iso14230 to use Nissan commands ! try \"set l2protocol\"\n");
return CMD_FAILED;
}
/* Open interface using current L1 proto and hardware */
rv = diag_l2_open(dl0d, global_cfg.L1proto);
if (rv) {
fprintf(stderr, "Open failed for protocol %d on %s\n",
global_cfg.L1proto, dl0d->dl0->shortname);
return CMD_FAILED;
}
if (global_cfg.addrtype) {
flags = DIAG_L2_TYPE_FUNCADDR;
} else {
flags = 0;
}
flags |= (global_cfg.initmode & DIAG_L2_TYPE_INITMASK);
d_conn = diag_l2_StartCommunications(dl0d, global_cfg.L2proto,
flags, global_cfg.speed, global_cfg.tgt, global_cfg.src);
if (d_conn == NULL) {
(void) diag_geterr();
diag_l2_close(dl0d);
printf("L2 StartComms failed\n");
return CMD_FAILED;
}
/* Connected ! */
global_l2_conn = d_conn;
global_state = STATE_CONNECTED;
npstate = NP_NORMALCONN;
update_params();
printf("Connected to ECU !\n");
struct diag_l2_14230 * dlproto; // for bypassing headers
dlproto = (struct diag_l2_14230 *)global_l2_conn->diag_l2_proto_data;
if (dlproto->modeflags & ISO14230_SHORTHDR) {
dlproto->modeflags &= ~ISO14230_LONGHDR; //deactivate long headers
} else {
printf("Short headers not supported by ECU ! Have you \"set addrtype phys\" ?"
"Some stuff will not work.");
}
if (get_ecuid(nisecu.ecuid)) {
printf("Couldn't get ECUID ? Verify settings, connection mode etc.\n");
return CMD_FAILED;
}
printf("ECUID: %s\n", (char *) nisecu.ecuid);
autoselect_keyset();
return CMD_OK;
}
int cmd_spconn(int argc, char **argv) {
(void) argv;
if (argc > 1) {
return CMD_USAGE;
}
if ((npstate != NP_DISC) ||
(global_state != STATE_IDLE)) {
printf("Error : already connected\n");
return CMD_FAILED;
}
nisecu_cleardata(&nisecu);
struct diag_l2_conn *d_conn;
struct diag_l0_device *dl0d = global_dl0d;
int i, rv;
flag_type flags = 0;
struct diag_l2_14230 *dp;
const struct diag_l2_proto *dl2p;
if (!dl0d) {
printf("No global L0. Please select + configure L0 first\n");
return CMD_FAILED;
}
if (global_cfg.L2proto != DIAG_L2_PROT_RAW) {
printf("L2 protocol must start as RAW to communicate with Subaru ECU ! try \"set l2protocol\"\n");
return CMD_FAILED;
}
/* Open interface using current L1 proto and hardware */
rv = diag_l2_open(dl0d, global_cfg.L1proto);
if (rv) {
fprintf(stderr, "Open failed for protocol %d on %s\n",
global_cfg.L1proto, dl0d->dl0->shortname);
return CMD_FAILED;
}
if (global_cfg.addrtype) {
flags = DIAG_L2_TYPE_FUNCADDR;
} else {
flags = 0;
}
flags |= (global_cfg.initmode & DIAG_L2_TYPE_INITMASK);
d_conn = diag_l2_StartCommunications(dl0d, global_cfg.L2proto,
flags, global_cfg.speed, global_cfg.tgt, global_cfg.src);
if (d_conn == NULL) {
(void) diag_geterr();
diag_l2_close(dl0d);
printf("L2 StartComms failed\n");
return CMD_FAILED;
}
//At this point we have a valid RAW connection and need to update d_conn manually to change to ISO14230 with Subaru headers, checksum
//The general initialisation would have set d_conn->diag_link, ->l2proto, ->diag_l2_type, ->diag_l2_srcaddr, ->diag_l2_destaddr,
//->diag_l2_p1 2 2e 3 4 min max, ->tinterval, ->tlast, ->diag_l2_state
//The RAW initialisation would have set diag_serial_settings and d_conn->diag_l2_destaddr and ->diag_l2_srcaddr
printf("L2 RAW detected, changing to L2 ISO14230\n");
global_cfg.L2proto = DIAG_L2_PROT_ISO14230;
for (i=0; l2proto_list[i] ; i++) {
dl2p = l2proto_list[i];
if (dl2p->diag_l2_protocol == global_cfg.L2proto) {
d_conn->l2proto = dl2p;
break;
}
}
rv = diag_calloc(&dp, 1);
if (rv != 0) {
return CMD_FAILED;
}
d_conn->diag_l2_proto_data = (void *)dp;
dp->srcaddr = global_cfg.src;
dp->dstaddr = global_cfg.tgt;
dp->first_frame = 0;
dp->monitor_mode = 0;
d_conn->diag_l2_kb1 = 0x8F;
d_conn->diag_l2_kb2 = 0xEA; //length byte required, address bytes required (ie) 4 byte headers
d_conn->diag_l2_physaddr = global_cfg.src;
dp->state = STATE_ESTABLISHED;
dp->modeflags = 6; //length byte required, address bytes required (ie) 4 byte headers
printf("Change to ISO14230 successful\n");
global_l2_conn = d_conn;
global_state = STATE_CONNECTED;
npstate = NP_NORMALCONN;
update_params();
if(sub_sid81_startcomms()) {
printf("SID 0x81 startCommunications failed. Verify settings, connection mode etc.\n");
global_l2_conn = NULL;
global_state = STATE_IDLE;
npstate = NP_DISC;
return CMD_FAILED;
}
/* Connected ! */
printf("\nConnected to ECU and ready for SSM or SID Commands\n");
if (sub_get_ecuid(nisecu.ecuid)) {
printf("Couldn't get ECUID ? Verify settings, connection mode etc.\n");
return CMD_FAILED;
}
printf("\nECUID: ");
for (i=0; i < 5; i++) {
printf("%02x ", nisecu.ecuid[i]);
}
printf("\n");
return CMD_OK;
}
int cmd_npdisc(UNUSED(int argc), UNUSED(char **argv)) {
if ((npstate == NP_DISC) ||
(global_state == STATE_IDLE)) {
return CMD_OK;
}
diag_l2_StopCommunications(global_l2_conn);
diag_l2_close(global_dl0d);
global_l2_conn = NULL;
global_state = STATE_IDLE;
npstate = NP_DISC;
return CMD_OK;
}
int cmd_stopkernel(int argc, UNUSED(char **argv)) {
uint8_t txdata[1];
struct diag_msg nisreq={0}; //request to send
struct diag_msg *rxmsg=NULL; //pointer to the reply
int errval;
if (npstate != NP_NPKCONN) {
return CMD_OK;
}
if (argc != 1) {
return CMD_USAGE;
}
printf("Resetting ECU and closing connection. You may need to change speed before reconnecting.\n");
txdata[0]=SID_RESET;
nisreq.len=1;
nisreq.data=txdata;
rxmsg=diag_l2_request(global_l2_conn, &nisreq, &errval);
if (rxmsg==NULL) {
return CMD_FAILED;
}
(void) diag_l2_ioctl(global_l2_conn, DIAG_IOCTL_IFLUSH, NULL);
(void) cmd_npdisc(0, NULL);
return CMD_OK;
}
//np 1: try start diagsession, Nissan Repro style +
// accesstimingparams (get limits + setvals)
static int np_1(UNUSED(int argc), UNUSED(char **argv)) {
uint8_t txdata[64]; //data for nisreq
struct diag_msg nisreq={0}; //request to send
struct diag_msg *rxmsg=NULL; //pointer to the reply
int errval;
txdata[0]=0x10;
txdata[1]=0x85;
txdata[2]=0x14;
nisreq.len=3;
nisreq.data=txdata;
rxmsg=diag_l2_request(global_l2_conn, &nisreq, &errval);
if (rxmsg==NULL) {
return CMD_FAILED;
}
if (rxmsg->data[0] != 0x50) {
printf("got bad response : ");
diag_data_dump(stdout, rxmsg->data, rxmsg->len);
printf("\n");
diag_freemsg(rxmsg);
return CMD_FAILED;
}
printf("StartDiagsess: got ");
diag_data_dump(stdout, rxmsg->data, rxmsg->len);
diag_freemsg(rxmsg);
//try accesstimingparam : read limits
txdata[0]=0x83;
txdata[1]=0x0; //read limits
nisreq.len=2;
rxmsg=diag_l2_request(global_l2_conn, &nisreq, &errval);
if (rxmsg==NULL) {
return CMD_FAILED;
}
printf("\nAccesTiming : read limits got ");
diag_data_dump(stdout, rxmsg->data, rxmsg->len);
diag_freemsg(rxmsg);
//try ATP : read settings
txdata[0]=0x83;
txdata[1]=0x02;
nisreq.len=2;
rxmsg=diag_l2_request(global_l2_conn, &nisreq, &errval);
if (rxmsg==NULL) {
return CMD_FAILED;
}
printf("\nAccesTiming : read settings got ");
diag_data_dump(stdout, rxmsg->data, rxmsg->len);
diag_freemsg(rxmsg);
printf("\n");
return CMD_OK;
}
//np 2 :
static int np_2(int argc, char **argv) {
//np 2 <addr> : read 1 byte @ addr, with SID A4
// TX {07 A4 <A0> <A1> <A2> <A3> 04 01 cks}, 9 bytes on bus
// RX {06 E4 <A0> <A1> <A2> <A3> <BB> cks}, 8 bytes
// total traffic : 17 bytes for 1 rx'd byte - very slow
//printf("Attempting to read 1 byte @ 000000:\n");
uint8_t txdata[64]; //data for nisreq
uint32_t addr;
struct diag_msg nisreq={0}; //request to send
struct diag_msg *rxmsg=NULL; //pointer to the reply
int errval;
if (argc != 3) {
printf("usage: npt 2 <addr>: read 1 byte @ <addr>\n");
return CMD_USAGE;
}
if (sscanf(argv[2], "%x", &addr) != 1) {
printf("Did not understand %s\n", argv[2]);
return CMD_USAGE;
}
txdata[0]=0xA4;
txdata[4]= (uint8_t) (addr & 0xFF);
txdata[3]= (uint8_t) (addr >> 8) & 0xFF;
txdata[2]= (uint8_t) (addr >> 16) & 0xFF;
txdata[1]= (uint8_t) (addr >> 24) & 0xFF;
txdata[5]=0x04; //TXM
txdata[6]=0x01; //NumResps
nisreq.len=7;
nisreq.data=txdata;
rxmsg=diag_l2_request(global_l2_conn, &nisreq, &errval);
if (rxmsg==NULL) {
return CMD_FAILED;
}
if ((rxmsg->data[0] != 0xE4) || (rxmsg->len != 6)) {
printf("got bad A4 response : ");
diag_data_dump(stdout, rxmsg->data, rxmsg->len);
printf("\n");
diag_freemsg(rxmsg);
return CMD_FAILED;
}
printf("Got: 0x%02X\n", rxmsg->data[5]);
diag_freemsg(rxmsg);
return CMD_OK;
}
/** np 5 : fast dump <len> bytes @<start> to already-opened <outf>;
* uses fast read technique (receive from L1 direct)
*
* return CMD_* , caller must close outf
*/
static int dump_fast(FILE *outf, const uint32_t start, uint32_t len) {
//SID AC + 21 technique.
// AC 81 {83 GGGG} {83 GGGG} ... to load addresses, (5*n + 4) bytes on bus
// RX: {EC 81}, 4 bytes
// TX: {21 81 04 01} to dump data (6 bytes)
// RX: {61 81 <n*data>} (4 + n) bytes.
// Total traffic : (6*n + 18) bytes on bus for <n> bytes RX'd
struct diag_msg nisreq={0}; //request to send
uint8_t txdata[64]; //data for nisreq
int errval;
int retryscore=100; //successes increase this up to 100; failures decrease it.
uint8_t hackbuf[70];
int extra; //extra bytes to purge
uint32_t addr, nextaddr, maxaddr;
unsigned long total_chron;
nextaddr = start;
maxaddr = start + len - 1;
if (!outf) {
return CMD_FAILED;
}
nisreq.data=txdata;
total_chron = diag_os_getms();
while (retryscore >0) {
unsigned int linecur=0; //count from 0 to 11 (12 addresses per request)
int txi; //index into txbuf for constructing request
printf("Starting dump from 0x%08X to 0x%08X.\n", nextaddr, maxaddr);
txdata[0]=0xAC;
txdata[1]=0x81;
nisreq.len = 2; //AC 81 : 2 bytes so far
txi=2;
linecur = 0;
unsigned long t0, chrono;
unsigned chron_cnt = 0; //how many bytes between refreshes
t0 = diag_os_getms();
for (addr=nextaddr; addr <= maxaddr; addr++) {
txdata[txi++]= 0x83; //field type
txdata[txi++]= (uint8_t) (addr >> 24) & 0xFF;
txdata[txi++]= (uint8_t) (addr >> 16) & 0xFF;
txdata[txi++]= (uint8_t) (addr >> 8) & 0xFF;
txdata[txi++]= (uint8_t) (addr & 0xFF);
nisreq.len += 5;
linecur += 1;
//request 12 addresses at a time, or whatever's left at the end
if ((linecur != 0x0c) && (addr != maxaddr)) {
continue;
}
unsigned curspeed, tmin, tsec;
chron_cnt += linecur;
chrono = diag_os_getms() - t0;
if (chrono > 200) {
//limit update rate
curspeed = 1000 * (chron_cnt) / chrono; //avg B/s
if (!curspeed) {
curspeed += 1;
}
tsec = ((maxaddr - addr) / curspeed) % 9999;
tmin = tsec / 60;
tsec = tsec % 60;
printf("\rreading @ 0x%08X (%3u %%, %5u B/s, ~ %3u:%02u remaining ", nextaddr,
(unsigned) 100 * (maxaddr - addr) / len, curspeed, tmin, tsec);
fflush(stdout);
chron_cnt = 0;
t0 = diag_os_getms();
}
int i, rqok;
//send the request "properly"
rqok = diag_l2_send(global_l2_conn, &nisreq);
if (rqok) {
printf("\nhack mode : bad l2_send\n");
retryscore -= 25;
diag_os_millisleep(300);
(void) diag_l2_ioctl(global_l2_conn, DIAG_IOCTL_IFLUSH, NULL);
break; //out of for()
}
rqok=0; //default to fail
//and get a response; we already know the max expected length:
// 0xEC 0x81 + 2 (short hdr) or +4 (full hdr).
// we'll request just 4 bytes so we return very fast;
// We should find 0xEC if it's in there no matter what kind of header.
// We'll "purge" the next bytes when we send SID 21
errval=diag_l1_recv(global_l2_conn->diag_link->l2_dl0d,
hackbuf, 4, (unsigned) (25 + nparam_rxe.val));
if (errval == 4) {
//try to find 0xEC in the first bytes:
for (i=0; i<=3; i++) {
if (hackbuf[i] == 0xEC) {
rqok=1;
break;
}
}
}
if (!rqok) {
printf("\nhack mode : bad AC response %02X %02X\n", hackbuf[0], hackbuf[1]);
retryscore -= 25;
diag_os_millisleep(300);
(void) diag_l2_ioctl(global_l2_conn, DIAG_IOCTL_IFLUSH, NULL);
break; //out of for()
}
//Here, we're guaranteed to have found 0xEC in the first 4 bytes we got. But we may
//need to "purge" some extra bytes on the next read
// hdr0 (hdr1) (hdr2) 0xEC 0x81 ck
//
extra = (3 + i - errval); //bytes to purge. I think the formula is ok
extra = (extra < 0) ? 0: extra; //make sure >=0
//Here, we sent a AC 81 83 ... 83... request that was accepted.
//We need to send 21 81 04 01 to get the data now
txdata[0]=0x21;
txdata[1]=0x81;
txdata[2]=0x04;
txdata[3]=0x01;
nisreq.len=4;
rqok=0; //default to fail
//send the request "properly"
if (diag_l2_send(global_l2_conn, &nisreq)) {
printf("l2_send() problem !\n");
retryscore -=25;
diag_os_millisleep(300);
(void) diag_l2_ioctl(global_l2_conn, DIAG_IOCTL_IFLUSH, NULL);
break; //out of for ()
}
//and get a response; we already know the max expected length:
//61 81 [2+linecur] + max 4 (header+cks) = 8+linecur
//but depending on the previous message there may be extra
//bytes still in buffer; we already calculated how many.
//By requesting (extra) + 4 with a short timeout, we'll return
//here very quickly and we're certain to "catch" 0x61.
errval=diag_l1_recv(global_l2_conn->diag_link->l2_dl0d,
hackbuf, extra + 4, (unsigned) (25 + nparam_rxe.val));
if (errval != extra+4) {
retryscore -=25;
diag_os_millisleep(300);
(void) diag_l2_ioctl(global_l2_conn, DIAG_IOCTL_IFLUSH, NULL);
break; //out of for ()
}
//try to find 0x61 in the first bytes:
for (i=0; i<errval; i++) {
if (hackbuf[i] == 0x61) {
rqok=1;
break;
}
}
//we now know where the real data starts so we can request the
//exact number of bytes remaining. Now, (errval - i) is the number
//of packet bytes already read including 0x61, ex.:
//[XX XX 61 81 YY YY ..] : i=2 and errval =5 means we have (5-2)=3 bytes
// of packet data (61 81 YY)
// Total we need (2 + linecur) packet bytes + 1 cksum
// So we need to read (2+linecur+1) - (errval-i) bytes...
// Plus : we need to dump those at the end of what we already got !
extra = (3 + linecur) - (errval - i);
if (extra<0) {
printf("\nhack mode : problem ! extra=%d\n",extra);
extra=0;
} else {
errval=diag_l1_recv(global_l2_conn->diag_link->l2_dl0d,
&hackbuf[errval], extra, (unsigned) (25 + nparam_rxe.val));
}
if (errval != extra) { //this should always fit...
rqok=0;
}
if (!rqok) {
//either negative response or not enough data !
printf("\nhack mode : bad 61 response %02X %02X, i=%02X extra=%02X ev=%02X\n",
hackbuf[i], hackbuf[i+1], i, extra, errval);
diag_os_millisleep(300);
(void) diag_l2_ioctl(global_l2_conn, DIAG_IOCTL_IFLUSH, NULL);
retryscore -= 25;
break; //out of for ()
}
//and verify checksum. [i] points to 0x61;
if (hackbuf[i+2+linecur] != diag_cks1(&hackbuf[i-1], 3+linecur)) {
//this checksum will not work with long headers...
printf("\nhack mode : bad 61 CS ! got %02X\n", hackbuf[i+2+linecur]);
diag_data_dump(stdout, &hackbuf[i], linecur+3);
diag_os_millisleep(300);
(void) diag_l2_ioctl(global_l2_conn, DIAG_IOCTL_IFLUSH, NULL);
retryscore -=20;
break; //out of for ()
}
//We can now dump this to the file...
if (fwrite(&(hackbuf[i+2]), 1, linecur, outf) != linecur) {
printf("Error writing file!\n");
retryscore -= 101; //fatal, sir
break; //out of for ()
}
nextaddr += linecur; //if we crash, we can resume starting at nextaddr
linecur=0;
//success: allow us more errors
retryscore = (retryscore > 95)? 100:(retryscore+5);
//and reset tx template + sub-counters
txdata[0]=0xAc;
txdata[1]=0x81;
nisreq.len=2;
txi=2;
} //for
if (addr <= maxaddr) {
//the for loop didn't complete;
//(if succesful, addr == maxaddr+1 !!)
printf("\nRetry score: %d\n", retryscore);
} else {
printf("\nFinished! ~%lu Bps\n", 1000*(maxaddr - start)/(diag_os_getms() - total_chron));
break; //leave while()
}
} //while retryscore>0
if (retryscore <= 0) {
printf("Too many errors, no more retries @ addr=%08X.\n", start);
return CMD_FAILED;
}
return CMD_OK;
}
/** Read bytes from memory
* copies <len> bytes from offset <addr> in ROM to *dest,
* using SID AC and std L2_request mechanism.
* Uses global conn, assumes global state is OK
* @return num of bytes read
*/
static uint32_t read_ac(uint8_t *dest, uint32_t addr, uint32_t len) {
uint8_t txdata[64]; //data for nisreq
struct diag_msg nisreq={0}; //request to send
struct diag_msg *rxmsg=NULL; //pointer to the reply
int errval;
uint32_t sent; //count
uint32_t goodbytes;
if (!dest || (len==0)) {
return 0;
}
unsigned int linecur; //count from 0 to 11 (12 addresses per request)
int txi; //index into txbuf for constructing request
txdata[0]=0xAC;
txdata[1]=0x81;