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btgatt-client.c
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/*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2014 Google Inc.
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <limits.h>
#include <errno.h>
#include "lib/bluetooth.h"
#include "lib/hci.h"
#include "lib/hci_lib.h"
#include "lib/l2cap.h"
#include "lib/uuid.h"
#include "src/shared/mainloop.h"
#include "src/shared/util.h"
#include "src/shared/att.h"
#include "src/shared/queue.h"
#include "src/shared/gatt-db.h"
#include "src/shared/gatt-client.h"
#define ATT_CID 4
#define PRLOG(...) \
printf(__VA_ARGS__); print_prompt();
#define COLOR_OFF "\x1B[0m"
#define COLOR_RED "\x1B[0;91m"
#define COLOR_GREEN "\x1B[0;92m"
#define COLOR_YELLOW "\x1B[0;93m"
#define COLOR_BLUE "\x1B[0;94m"
#define COLOR_MAGENTA "\x1B[0;95m"
#define COLOR_BOLDGRAY "\x1B[1;30m"
#define COLOR_BOLDWHITE "\x1B[1;37m"
static bool verbose = false;
struct client {
int fd;
struct bt_att *att;
struct gatt_db *db;
struct bt_gatt_client *gatt;
unsigned int reliable_session_id;
};
static void print_prompt(void)
{
printf(COLOR_BLUE "[GATT client]" COLOR_OFF "# ");
fflush(stdout);
}
static const char *ecode_to_string(uint8_t ecode)
{
switch (ecode) {
case BT_ATT_ERROR_INVALID_HANDLE:
return "Invalid Handle";
case BT_ATT_ERROR_READ_NOT_PERMITTED:
return "Read Not Permitted";
case BT_ATT_ERROR_WRITE_NOT_PERMITTED:
return "Write Not Permitted";
case BT_ATT_ERROR_INVALID_PDU:
return "Invalid PDU";
case BT_ATT_ERROR_AUTHENTICATION:
return "Authentication Required";
case BT_ATT_ERROR_REQUEST_NOT_SUPPORTED:
return "Request Not Supported";
case BT_ATT_ERROR_INVALID_OFFSET:
return "Invalid Offset";
case BT_ATT_ERROR_AUTHORIZATION:
return "Authorization Required";
case BT_ATT_ERROR_PREPARE_QUEUE_FULL:
return "Prepare Write Queue Full";
case BT_ATT_ERROR_ATTRIBUTE_NOT_FOUND:
return "Attribute Not Found";
case BT_ATT_ERROR_ATTRIBUTE_NOT_LONG:
return "Attribute Not Long";
case BT_ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE:
return "Insuficient Encryption Key Size";
case BT_ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LEN:
return "Invalid Attribute value len";
case BT_ATT_ERROR_UNLIKELY:
return "Unlikely Error";
case BT_ATT_ERROR_INSUFFICIENT_ENCRYPTION:
return "Insufficient Encryption";
case BT_ATT_ERROR_UNSUPPORTED_GROUP_TYPE:
return "Group type Not Supported";
case BT_ATT_ERROR_INSUFFICIENT_RESOURCES:
return "Insufficient Resources";
case BT_ERROR_CCC_IMPROPERLY_CONFIGURED:
return "CCC Improperly Configured";
case BT_ERROR_ALREADY_IN_PROGRESS:
return "Procedure Already in Progress";
case BT_ERROR_OUT_OF_RANGE:
return "Out of Range";
default:
return "Unknown error type";
}
}
static void att_disconnect_cb(int err, void *user_data)
{
printf("Device disconnected: %s\n", strerror(err));
mainloop_quit();
}
static void att_debug_cb(const char *str, void *user_data)
{
const char *prefix = user_data;
PRLOG(COLOR_BOLDGRAY "%s" COLOR_BOLDWHITE "%s\n" COLOR_OFF, prefix, str);
}
static void gatt_debug_cb(const char *str, void *user_data)
{
const char *prefix = user_data;
PRLOG(COLOR_GREEN "%s%s\n" COLOR_OFF, prefix, str);
}
static void ready_cb(bool success, uint8_t att_ecode, void *user_data);
static void service_changed_cb(uint16_t start_handle, uint16_t end_handle,
void *user_data);
static void log_service_event(struct gatt_db_attribute *attr, const char *str)
{
char uuid_str[MAX_LEN_UUID_STR];
bt_uuid_t uuid;
uint16_t start, end;
gatt_db_attribute_get_service_uuid(attr, &uuid);
bt_uuid_to_string(&uuid, uuid_str, sizeof(uuid_str));
gatt_db_attribute_get_service_handles(attr, &start, &end);
PRLOG("%s - UUID: %s start: 0x%04x end: 0x%04x\n", str, uuid_str,
start, end);
}
static void service_added_cb(struct gatt_db_attribute *attr, void *user_data)
{
log_service_event(attr, "Service Added");
}
static void service_removed_cb(struct gatt_db_attribute *attr, void *user_data)
{
log_service_event(attr, "Service Removed");
}
static struct client *client_create(int fd, uint16_t mtu)
{
struct client *cli;
cli = new0(struct client, 1);
if (!cli) {
fprintf(stderr, "Failed to allocate memory for client\n");
return NULL;
}
cli->att = bt_att_new(fd, false);
if (!cli->att) {
fprintf(stderr, "Failed to initialze ATT transport layer\n");
bt_att_unref(cli->att);
free(cli);
return NULL;
}
if (!bt_att_set_close_on_unref(cli->att, true)) {
fprintf(stderr, "Failed to set up ATT transport layer\n");
bt_att_unref(cli->att);
free(cli);
return NULL;
}
if (!bt_att_register_disconnect(cli->att, att_disconnect_cb, NULL,
NULL)) {
fprintf(stderr, "Failed to set ATT disconnect handler\n");
bt_att_unref(cli->att);
free(cli);
return NULL;
}
cli->fd = fd;
cli->db = gatt_db_new();
if (!cli->db) {
fprintf(stderr, "Failed to create GATT database\n");
bt_att_unref(cli->att);
free(cli);
return NULL;
}
cli->gatt = bt_gatt_client_new(cli->db, cli->att, mtu);
if (!cli->gatt) {
fprintf(stderr, "Failed to create GATT client\n");
gatt_db_unref(cli->db);
bt_att_unref(cli->att);
free(cli);
return NULL;
}
gatt_db_register(cli->db, service_added_cb, service_removed_cb,
NULL, NULL);
if (verbose) {
bt_att_set_debug(cli->att, att_debug_cb, "att: ", NULL);
bt_gatt_client_set_debug(cli->gatt, gatt_debug_cb, "gatt: ",
NULL);
}
bt_gatt_client_set_ready_handler(cli->gatt, ready_cb, cli, NULL);
bt_gatt_client_set_service_changed(cli->gatt, service_changed_cb, cli,
NULL);
/* bt_gatt_client already holds a reference */
gatt_db_unref(cli->db);
return cli;
}
static void client_destroy(struct client *cli)
{
bt_gatt_client_unref(cli->gatt);
bt_att_unref(cli->att);
free(cli);
}
static void print_uuid(const bt_uuid_t *uuid)
{
char uuid_str[MAX_LEN_UUID_STR];
bt_uuid_t uuid128;
bt_uuid_to_uuid128(uuid, &uuid128);
bt_uuid_to_string(&uuid128, uuid_str, sizeof(uuid_str));
printf("%s\n", uuid_str);
}
static void print_incl(struct gatt_db_attribute *attr, void *user_data)
{
struct client *cli = user_data;
uint16_t handle, start, end;
struct gatt_db_attribute *service;
bt_uuid_t uuid;
if (!gatt_db_attribute_get_incl_data(attr, &handle, &start, &end))
return;
service = gatt_db_get_attribute(cli->db, start);
if (!service)
return;
gatt_db_attribute_get_service_uuid(service, &uuid);
printf("\t " COLOR_GREEN "include" COLOR_OFF " - handle: "
"0x%04x, - start: 0x%04x, end: 0x%04x,"
"uuid: ", handle, start, end);
print_uuid(&uuid);
}
static void print_desc(struct gatt_db_attribute *attr, void *user_data)
{
printf("\t\t " COLOR_MAGENTA "descr" COLOR_OFF
" - handle: 0x%04x, uuid: ",
gatt_db_attribute_get_handle(attr));
print_uuid(gatt_db_attribute_get_type(attr));
}
static void print_chrc(struct gatt_db_attribute *attr, void *user_data)
{
uint16_t handle, value_handle;
uint8_t properties;
uint16_t ext_prop;
bt_uuid_t uuid;
if (!gatt_db_attribute_get_char_data(attr, &handle,
&value_handle,
&properties,
&ext_prop,
&uuid))
return;
printf("\t " COLOR_YELLOW "charac" COLOR_OFF
" - start: 0x%04x, value: 0x%04x, "
"props: 0x%02x, ext_props: 0x%04x, uuid: ",
handle, value_handle, properties, ext_prop);
print_uuid(&uuid);
gatt_db_service_foreach_desc(attr, print_desc, NULL);
}
static void print_service(struct gatt_db_attribute *attr, void *user_data)
{
struct client *cli = user_data;
uint16_t start, end;
bool primary;
bt_uuid_t uuid;
if (!gatt_db_attribute_get_service_data(attr, &start, &end, &primary,
&uuid))
return;
printf(COLOR_RED "service" COLOR_OFF " - start: 0x%04x, "
"end: 0x%04x, type: %s, uuid: ",
start, end, primary ? "primary" : "secondary");
print_uuid(&uuid);
gatt_db_service_foreach_incl(attr, print_incl, cli);
gatt_db_service_foreach_char(attr, print_chrc, NULL);
printf("\n");
}
static void print_services(struct client *cli)
{
printf("\n");
gatt_db_foreach_service(cli->db, NULL, print_service, cli);
}
static void print_services_by_uuid(struct client *cli, const bt_uuid_t *uuid)
{
printf("\n");
gatt_db_foreach_service(cli->db, uuid, print_service, cli);
}
static void print_services_by_handle(struct client *cli, uint16_t handle)
{
printf("\n");
/* TODO: Filter by handle */
gatt_db_foreach_service(cli->db, NULL, print_service, cli);
}
static void ready_cb(bool success, uint8_t att_ecode, void *user_data)
{
struct client *cli = user_data;
if (!success) {
PRLOG("GATT discovery procedures failed - error code: 0x%02x\n",
att_ecode);
return;
}
PRLOG("GATT discovery procedures complete\n");
print_services(cli);
print_prompt();
}
static void service_changed_cb(uint16_t start_handle, uint16_t end_handle,
void *user_data)
{
struct client *cli = user_data;
printf("\nService Changed handled - start: 0x%04x end: 0x%04x\n",
start_handle, end_handle);
gatt_db_foreach_service_in_range(cli->db, NULL, print_service, cli,
start_handle, end_handle);
print_prompt();
}
static void services_usage(void)
{
printf("Usage: services [options]\nOptions:\n"
"\t -u, --uuid <uuid>\tService UUID\n"
"\t -a, --handle <handle>\tService start handle\n"
"\t -h, --help\t\tShow help message\n"
"e.g.:\n"
"\tservices\n\tservices -u 0x180d\n\tservices -a 0x0009\n");
}
static bool parse_args(char *str, int expected_argc, char **argv, int *argc)
{
char **ap;
for (ap = argv; (*ap = strsep(&str, " \t")) != NULL;) {
if (**ap == '\0')
continue;
(*argc)++;
ap++;
if (*argc > expected_argc)
return false;
}
return true;
}
static void cmd_services(struct client *cli, char *cmd_str)
{
char *argv[3];
int argc = 0;
if (!bt_gatt_client_is_ready(cli->gatt)) {
printf("GATT client not initialized\n");
return;
}
if (!parse_args(cmd_str, 2, argv, &argc)) {
services_usage();
return;
}
if (!argc) {
print_services(cli);
return;
}
if (argc != 2) {
services_usage();
return;
}
if (!strcmp(argv[0], "-u") || !strcmp(argv[0], "--uuid")) {
bt_uuid_t tmp, uuid;
if (bt_string_to_uuid(&tmp, argv[1]) < 0) {
printf("Invalid UUID: %s\n", argv[1]);
return;
}
bt_uuid_to_uuid128(&tmp, &uuid);
print_services_by_uuid(cli, &uuid);
} else if (!strcmp(argv[0], "-a") || !strcmp(argv[0], "--handle")) {
uint16_t handle;
char *endptr = NULL;
handle = strtol(argv[1], &endptr, 0);
if (!endptr || *endptr != '\0') {
printf("Invalid start handle: %s\n", argv[1]);
return;
}
print_services_by_handle(cli, handle);
} else
services_usage();
}
static void read_multiple_usage(void)
{
printf("Usage: read-multiple <handle_1> <handle_2> ...\n");
}
static void read_multiple_cb(bool success, uint8_t att_ecode,
const uint8_t *value, uint16_t length,
void *user_data)
{
int i;
if (!success) {
PRLOG("\nRead multiple request failed: 0x%02x\n", att_ecode);
return;
}
printf("\nRead multiple value (%u bytes):", length);
for (i = 0; i < length; i++)
printf("%02x ", value[i]);
PRLOG("\n");
}
static void cmd_read_multiple(struct client *cli, char *cmd_str)
{
int argc = 0;
uint16_t *value;
char *argv[512];
int i;
char *endptr = NULL;
if (!bt_gatt_client_is_ready(cli->gatt)) {
printf("GATT client not initialized\n");
return;
}
if (!parse_args(cmd_str, sizeof(argv), argv, &argc) || argc < 2) {
read_multiple_usage();
return;
}
value = malloc(sizeof(uint16_t) * argc);
if (!value) {
printf("Failed to construct value\n");
return;
}
for (i = 0; i < argc; i++) {
value[i] = strtol(argv[i], &endptr, 0);
if (endptr == argv[i] || *endptr != '\0' || !value[i]) {
printf("Invalid value byte: %s\n", argv[i]);
free(value);
return;
}
}
if (!bt_gatt_client_read_multiple(cli->gatt, value, argc,
read_multiple_cb, NULL, NULL))
printf("Failed to initiate read multiple procedure\n");
free(value);
}
static void read_value_usage(void)
{
printf("Usage: read-value <value_handle>\n");
}
static void read_cb(bool success, uint8_t att_ecode, const uint8_t *value,
uint16_t length, void *user_data)
{
int i;
if (!success) {
PRLOG("\nRead request failed: %s (0x%02x)\n",
ecode_to_string(att_ecode), att_ecode);
return;
}
printf("\nRead value");
if (length == 0) {
PRLOG(": 0 bytes\n");
return;
}
printf(" (%u bytes): ", length);
for (i = 0; i < length; i++)
printf("%02x ", value[i]);
PRLOG("\n");
}
static void cmd_read_value(struct client *cli, char *cmd_str)
{
char *argv[2];
int argc = 0;
uint16_t handle;
char *endptr = NULL;
if (!bt_gatt_client_is_ready(cli->gatt)) {
printf("GATT client not initialized\n");
return;
}
if (!parse_args(cmd_str, 1, argv, &argc) || argc != 1) {
read_value_usage();
return;
}
handle = strtol(argv[0], &endptr, 0);
if (!endptr || *endptr != '\0' || !handle) {
printf("Invalid value handle: %s\n", argv[0]);
return;
}
if (!bt_gatt_client_read_value(cli->gatt, handle, read_cb,
NULL, NULL))
printf("Failed to initiate read value procedure\n");
}
static void read_long_value_usage(void)
{
printf("Usage: read-long-value <value_handle> <offset>\n");
}
static void cmd_read_long_value(struct client *cli, char *cmd_str)
{
char *argv[3];
int argc = 0;
uint16_t handle;
uint16_t offset;
char *endptr = NULL;
if (!bt_gatt_client_is_ready(cli->gatt)) {
printf("GATT client not initialized\n");
return;
}
if (!parse_args(cmd_str, 2, argv, &argc) || argc != 2) {
read_long_value_usage();
return;
}
handle = strtol(argv[0], &endptr, 0);
if (!endptr || *endptr != '\0' || !handle) {
printf("Invalid value handle: %s\n", argv[0]);
return;
}
endptr = NULL;
offset = strtol(argv[1], &endptr, 0);
if (!endptr || *endptr != '\0') {
printf("Invalid offset: %s\n", argv[1]);
return;
}
if (!bt_gatt_client_read_long_value(cli->gatt, handle, offset, read_cb,
NULL, NULL))
printf("Failed to initiate read long value procedure\n");
}
static void write_value_usage(void)
{
printf("Usage: write-value [options] <value_handle> <value>\n"
"Options:\n"
"\t-w, --without-response\tWrite without response\n"
"\t-s, --signed-write\tSigned write command\n"
"e.g.:\n"
"\twrite-value 0x0001 00 01 00\n");
}
static struct option write_value_options[] = {
{ "without-response", 0, 0, 'w' },
{ "signed-write", 0, 0, 's' },
{ }
};
static void write_cb(bool success, uint8_t att_ecode, void *user_data)
{
if (success) {
PRLOG("\nWrite successful\n");
} else {
PRLOG("\nWrite failed: %s (0x%02x)\n",
ecode_to_string(att_ecode), att_ecode);
}
}
static void cmd_write_value(struct client *cli, char *cmd_str)
{
int opt, i, val;
char *argvbuf[516];
char **argv = argvbuf;
int argc = 1;
uint16_t handle;
char *endptr = NULL;
int length;
uint8_t *value = NULL;
bool without_response = false;
bool signed_write = false;
if (!bt_gatt_client_is_ready(cli->gatt)) {
printf("GATT client not initialized\n");
return;
}
if (!parse_args(cmd_str, 514, argv + 1, &argc)) {
printf("Too many arguments\n");
write_value_usage();
return;
}
optind = 0;
argv[0] = "write-value";
while ((opt = getopt_long(argc, argv, "+ws", write_value_options,
NULL)) != -1) {
switch (opt) {
case 'w':
without_response = true;
break;
case 's':
signed_write = true;
break;
default:
write_value_usage();
return;
}
}
argc -= optind;
argv += optind;
if (argc < 1) {
write_value_usage();
return;
}
handle = strtol(argv[0], &endptr, 0);
if (!endptr || *endptr != '\0' || !handle) {
printf("Invalid handle: %s\n", argv[0]);
return;
}
length = argc - 1;
if (length > 0) {
if (length > UINT16_MAX) {
printf("Write value too long\n");
return;
}
value = malloc(length);
if (!value) {
printf("Failed to construct write value\n");
return;
}
for (i = 1; i < argc; i++) {
val = strtol(argv[i], &endptr, 0);
if (endptr == argv[i] || *endptr != '\0'
|| errno == ERANGE || val < 0 || val > 255) {
printf("Invalid value byte: %s\n",
argv[i]);
goto done;
}
value[i-1] = val;
}
}
if (without_response) {
if (!bt_gatt_client_write_without_response(cli->gatt, handle,
signed_write, value, length)) {
printf("Failed to initiate write without response "
"procedure\n");
goto done;
}
printf("Write command sent\n");
goto done;
}
if (!bt_gatt_client_write_value(cli->gatt, handle, value, length,
write_cb,
NULL, NULL))
printf("Failed to initiate write procedure\n");
done:
free(value);
}
static void write_long_value_usage(void)
{
printf("Usage: write-long-value [options] <value_handle> <offset> "
"<value>\n"
"Options:\n"
"\t-r, --reliable-write\tReliable write\n"
"e.g.:\n"
"\twrite-long-value 0x0001 0 00 01 00\n");
}
static struct option write_long_value_options[] = {
{ "reliable-write", 0, 0, 'r' },
{ }
};
static void write_long_cb(bool success, bool reliable_error, uint8_t att_ecode,
void *user_data)
{
if (success) {
PRLOG("Write successful\n");
} else if (reliable_error) {
PRLOG("Reliable write not verified\n");
} else {
PRLOG("\nWrite failed: %s (0x%02x)\n",
ecode_to_string(att_ecode), att_ecode);
}
}
static void cmd_write_long_value(struct client *cli, char *cmd_str)
{
int opt, i, val;
char *argvbuf[516];
char **argv = argvbuf;
int argc = 1;
uint16_t handle;
uint16_t offset;
char *endptr = NULL;
int length;
uint8_t *value = NULL;
bool reliable_writes = false;
if (!bt_gatt_client_is_ready(cli->gatt)) {
printf("GATT client not initialized\n");
return;
}
if (!parse_args(cmd_str, 514, argv + 1, &argc)) {
printf("Too many arguments\n");
write_value_usage();
return;
}
optind = 0;
argv[0] = "write-long-value";
while ((opt = getopt_long(argc, argv, "+r", write_long_value_options,
NULL)) != -1) {
switch (opt) {
case 'r':
reliable_writes = true;
break;
default:
write_long_value_usage();
return;
}
}
argc -= optind;
argv += optind;
if (argc < 2) {
write_long_value_usage();
return;
}
handle = strtol(argv[0], &endptr, 0);
if (!endptr || *endptr != '\0' || !handle) {
printf("Invalid handle: %s\n", argv[0]);
return;
}
endptr = NULL;
offset = strtol(argv[1], &endptr, 0);
if (!endptr || *endptr != '\0' || errno == ERANGE) {
printf("Invalid offset: %s\n", argv[1]);
return;
}
length = argc - 2;
if (length > 0) {
if (length > UINT16_MAX) {
printf("Write value too long\n");
return;
}
value = malloc(length);
if (!value) {
printf("Failed to construct write value\n");
return;
}
for (i = 2; i < argc; i++) {
val = strtol(argv[i], &endptr, 0);
if (endptr == argv[i] || *endptr != '\0'
|| errno == ERANGE || val < 0 || val > 255) {
printf("Invalid value byte: %s\n",
argv[i]);
free(value);
return;
}
value[i-2] = val;
}
}
if (!bt_gatt_client_write_long_value(cli->gatt, reliable_writes, handle,
offset, value, length,
write_long_cb,
NULL, NULL))
printf("Failed to initiate long write procedure\n");
free(value);
}
static void write_prepare_usage(void)
{
printf("Usage: write-prepare [options] <value_handle> <offset> "
"<value>\n"
"Options:\n"
"\t-s, --session-id\tSession id\n"
"e.g.:\n"
"\twrite-prepare -s 1 0x0001 00 01 00\n");
}
static struct option write_prepare_options[] = {
{ "session-id", 1, 0, 's' },
{ }
};
static void cmd_write_prepare(struct client *cli, char *cmd_str)
{
int opt, i, val;
char *argvbuf[516];
char **argv = argvbuf;
int argc = 0;
unsigned int id = 0;
uint16_t handle;
uint16_t offset;
char *endptr = NULL;
unsigned int length;
uint8_t *value = NULL;
if (!bt_gatt_client_is_ready(cli->gatt)) {
printf("GATT client not initialized\n");
return;
}
if (!parse_args(cmd_str, 514, argv + 1, &argc)) {
printf("Too many arguments\n");
write_value_usage();
return;
}
/* Add command name for getopt_long */
argc++;
argv[0] = "write-prepare";
optind = 0;
while ((opt = getopt_long(argc, argv , "s:", write_prepare_options,
NULL)) != -1) {
switch (opt) {
case 's':
if (!optarg) {
write_prepare_usage();
return;
}
id = atoi(optarg);
break;
default:
write_prepare_usage();
return;
}
}
argc -= optind;
argv += optind;
if (argc < 3) {
write_prepare_usage();
return;
}
if (cli->reliable_session_id != id) {
printf("Session id != Ongoing session id (%u!=%u)\n", id,
cli->reliable_session_id);
return;
}
handle = strtol(argv[0], &endptr, 0);
if (!endptr || *endptr != '\0' || !handle) {
printf("Invalid handle: %s\n", argv[0]);
return;
}
endptr = NULL;
offset = strtol(argv[1], &endptr, 0);
if (!endptr || *endptr != '\0' || errno == ERANGE) {
printf("Invalid offset: %s\n", argv[1]);
return;
}
/*
* First two arguments are handle and offset. What remains is the value
* length
*/
length = argc - 2;
if (length == 0)
goto done;
if (length > UINT16_MAX) {
printf("Write value too long\n");
return;
}
value = malloc(length);
if (!value) {
printf("Failed to allocate memory for value\n");
return;
}
for (i = 2; i < argc; i++) {
val = strtol(argv[i], &endptr, 0);
if (endptr == argv[i] || *endptr != '\0' || errno == ERANGE
|| val < 0 || val > 255) {
printf("Invalid value byte: %s\n", argv[i]);
free(value);