| /* |
| * Copyright (c) 2017 Linaro Limited |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /* |
| * Copyright (c) 2016, Eistec AB. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holder nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| * OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /* |
| * Original Authors: |
| * Joakim NohlgÄrd <joakim.nohlgard@eistec.se> |
| * Joakim Eriksson <joakime@sics.se> added JSON reader parts |
| */ |
| |
| /* |
| * Zephyr Contribution by Michael Scott <michael.scott@linaro.org> |
| * - Zephyr code style changes / code cleanup |
| * - Move to Zephyr APIs where possible |
| * - Convert to Zephyr int/uint types |
| * - Remove engine dependency (replace with writer/reader context) |
| * - Add write / read int64 functions |
| */ |
| |
| /* |
| * TODO: |
| * - Debug formatting errors in Leshan |
| * - Replace magic #'s with defines |
| * - Research using Zephyr JSON lib for json_next_token() |
| */ |
| |
| #define SYS_LOG_DOMAIN "lib/lwm2m_json" |
| #define SYS_LOG_LEVEL CONFIG_SYS_LOG_LWM2M_LEVEL |
| #include <logging/sys_log.h> |
| |
| #include <stdio.h> |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <inttypes.h> |
| #include <ctype.h> |
| |
| #include "lwm2m_object.h" |
| #include "lwm2m_rw_json.h" |
| #include "lwm2m_rw_plain_text.h" |
| #include "lwm2m_engine.h" |
| |
| #define T_NONE 0 |
| #define T_STRING_B 1 |
| #define T_STRING 2 |
| #define T_NAME 3 |
| #define T_OBJ 4 |
| #define T_VAL 5 |
| |
| #define SEPARATOR(f) ((f & WRITER_OUTPUT_VALUE) ? "," : "") |
| |
| /* writer modes */ |
| #define MODE_NONE 0 |
| #define MODE_INSTANCE 1 |
| #define MODE_VALUE 2 |
| #define MODE_READY 3 |
| |
| #define TOKEN_BUF_LEN 64 |
| |
| struct json_data { |
| u8_t name[TOKEN_BUF_LEN]; |
| u8_t value[TOKEN_BUF_LEN]; |
| u8_t name_len; |
| u8_t value_len; |
| }; |
| |
| /* some temporary buffer space for format conversions */ |
| static char json_buffer[64]; |
| |
| static void json_add_char(struct json_data *json, u8_t c, u8_t json_type) |
| { |
| if (json_type == T_STRING_B) { |
| json->name[json->name_len++] = c; |
| } else if (json_type == T_STRING_B) { |
| json->value[json->value_len++] = c; |
| } |
| } |
| |
| /* Simlified JSON style reader for reading in values from a LWM2M JSON string */ |
| static int json_next_token(struct lwm2m_input_context *in, |
| struct json_data *json) |
| { |
| u8_t json_type = T_NONE; |
| u8_t cont; |
| u8_t c; |
| bool escape = false; |
| |
| memset(json, 0, sizeof(struct json_data)); |
| cont = 1; |
| |
| /* We will be either at start, or at a specific position */ |
| while (in->frag && in->offset != 0xffff && cont) { |
| in->frag = net_frag_read_u8(in->frag, in->offset, &in->offset, |
| &c); |
| if (!in->frag && in->offset == 0xffff) { |
| break; |
| } |
| |
| if (c == '\\') { |
| escape = true; |
| continue; |
| } |
| |
| switch (c) { |
| |
| case '{': |
| if (!escape) { |
| json_type = T_OBJ; |
| } else { |
| json_add_char(json, c, json_type); |
| } |
| |
| break; |
| |
| case '}': |
| case ',': |
| if (!escape) { |
| if (json_type == T_VAL || |
| json_type == T_STRING) { |
| json->value[json->value_len] = '\0'; |
| json_type = T_NONE; |
| cont = 0; |
| } |
| } else { |
| json_add_char(json, c, json_type); |
| } |
| |
| break; |
| |
| case '"': |
| if (!escape && json_type == T_STRING_B) { |
| json->name[json->name_len] = '\0'; |
| json_type = T_STRING; |
| } else if (!escape) { |
| json_type = T_STRING_B; |
| json->name_len = 0; |
| } else { |
| json_add_char(json, c, json_type); |
| } |
| |
| break; |
| |
| case ':': |
| if (json_type == T_STRING) { |
| json_type = T_VAL; |
| } else { |
| json_add_char(json, c, json_type); |
| } |
| |
| break; |
| |
| /* ignore whitespace */ |
| case ' ': |
| case '\n': |
| case '\t': |
| if (json_type != T_STRING_B) { |
| break; |
| } |
| |
| /* fallthrough */ |
| |
| default: |
| json_add_char(json, c, json_type); |
| |
| } |
| |
| if (escape) { |
| escape = false; |
| } |
| } |
| |
| /* OK if cont == 0 othewise we failed */ |
| return (cont == 0); |
| } |
| |
| static size_t put_begin(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path) |
| { |
| int len; |
| |
| len = snprintk(json_buffer, sizeof(json_buffer), |
| "{\"bn\":\"/%u/%u/\",\"e\":[", |
| path->obj_id, path->obj_inst_id); |
| out->writer_flags = 0; /* set flags to zero */ |
| if (len < 0) { |
| /* TODO: Generate error? */ |
| return 0; |
| } |
| |
| out->frag = net_pkt_write(out->out_cpkt->pkt, out->frag, |
| out->offset, &out->offset, len, json_buffer, |
| BUF_ALLOC_TIMEOUT); |
| if (!out->frag && out->offset == 0xffff) { |
| /* TODO: Generate error? */ |
| return 0; |
| } |
| |
| return (size_t)len; |
| } |
| |
| static size_t put_end(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path) |
| { |
| out->frag = net_pkt_write(out->out_cpkt->pkt, out->frag, |
| out->offset, &out->offset, 2, "]}", |
| BUF_ALLOC_TIMEOUT); |
| if (!out->frag && out->offset == 0xffff) { |
| /* TODO: Generate error? */ |
| return 0; |
| } |
| |
| return 2; |
| } |
| |
| static size_t put_begin_ri(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path) |
| { |
| out->writer_flags |= WRITER_RESOURCE_INSTANCE; |
| return 0; |
| } |
| |
| static size_t put_end_ri(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path) |
| { |
| out->writer_flags &= ~WRITER_RESOURCE_INSTANCE; |
| return 0; |
| } |
| |
| static size_t put_json_prefix(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path, |
| const char *format) |
| { |
| char *sep = SEPARATOR(out->writer_flags); |
| int len = 0; |
| |
| if (out->writer_flags & WRITER_RESOURCE_INSTANCE) { |
| len = snprintk(json_buffer, sizeof(json_buffer), |
| "%s{\"n\":\"%u/%u\",%s:", |
| sep, path->res_id, path->res_inst_id, |
| format); |
| } else { |
| len = snprintk(json_buffer, sizeof(json_buffer), |
| "%s{\"n\":\"%u\",%s:", |
| sep, path->res_id, format); |
| } |
| |
| if (len < 0) { |
| /* TODO: Generate error? */ |
| return 0; |
| } |
| |
| out->frag = net_pkt_write(out->out_cpkt->pkt, out->frag, |
| out->offset, &out->offset, len, json_buffer, |
| BUF_ALLOC_TIMEOUT); |
| if (!out->frag && out->offset == 0xffff) { |
| /* TODO: Generate error? */ |
| return 0; |
| } |
| |
| return len; |
| } |
| |
| static size_t put_json_postfix(struct lwm2m_output_context *out) |
| { |
| |
| out->frag = net_pkt_write(out->out_cpkt->pkt, out->frag, |
| out->offset, &out->offset, 1, "}", |
| BUF_ALLOC_TIMEOUT); |
| if (!out->frag && out->offset == 0xffff) { |
| /* TODO: Generate error? */ |
| return 0; |
| } |
| |
| out->writer_flags |= WRITER_OUTPUT_VALUE; |
| return 1; |
| } |
| |
| static size_t put_s32(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path, s32_t value) |
| { |
| int len; |
| |
| len = put_json_prefix(out, path, "\"v\""); |
| len += plain_text_put_format(out, "%d", value); |
| len += put_json_postfix(out); |
| |
| return (size_t)len; |
| } |
| |
| static size_t put_s16(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path, s16_t value) |
| { |
| return put_s32(out, path, (s32_t)value); |
| } |
| |
| static size_t put_s8(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path, s8_t value) |
| { |
| return put_s32(out, path, (s32_t)value); |
| } |
| |
| static size_t put_s64(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path, s64_t value) |
| { |
| int len; |
| |
| len = put_json_prefix(out, path, "\"v\""); |
| len += plain_text_put_format(out, "%lld", value); |
| len += put_json_postfix(out); |
| return (size_t)len; |
| } |
| |
| static size_t put_char(struct lwm2m_output_context *out, |
| char c) |
| { |
| out->frag = net_pkt_write(out->out_cpkt->pkt, out->frag, |
| out->offset, &out->offset, 1, &c, |
| BUF_ALLOC_TIMEOUT); |
| if (!out->frag && out->offset == 0xffff) { |
| /* TODO: Generate error? */ |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static size_t put_string(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path, |
| char *buf, size_t buflen) |
| { |
| size_t i; |
| size_t len = 0; |
| int res; |
| |
| res = put_json_prefix(out, path, "\"sv\""); |
| res += put_char(out, '"'); |
| |
| if (res < 0) { |
| /* TODO: Generate error? */ |
| return 0; |
| } |
| |
| len += res; |
| |
| for (i = 0; i < buflen; ++i) { |
| /* Escape special characters */ |
| /* TODO: Handle UTF-8 strings */ |
| if (buf[i] < '\x20') { |
| res = snprintk(json_buffer, sizeof(json_buffer), |
| "\\x%x", buf[i]); |
| if (res < 0) { |
| /* TODO: Generate error? */ |
| return 0; |
| } |
| |
| out->frag = net_pkt_write(out->out_cpkt->pkt, out->frag, |
| out->offset, &out->offset, |
| res, json_buffer, |
| BUF_ALLOC_TIMEOUT); |
| if (!out->frag && out->offset == 0xffff) { |
| /* TODO: Generate error? */ |
| return 0; |
| } |
| |
| len += res; |
| continue; |
| } else if (buf[i] == '"' || buf[i] == '\\') { |
| len += put_char(out, '\\'); |
| } |
| |
| len += put_char(out, buf[i]); |
| } |
| |
| res = put_char(out, '"'); |
| if (res < 0) { |
| /* TODO: Generate error? */ |
| return 0; |
| } |
| |
| len += res; |
| len += put_json_postfix(out); |
| return len; |
| } |
| |
| static size_t put_float32fix(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path, |
| float32_value_t *value) |
| { |
| size_t len; |
| |
| len = put_json_prefix(out, path, "\"v\""); |
| len += plain_text_put_format(out, "%d.%d", value->val1, value->val2); |
| len += put_json_postfix(out); |
| return len; |
| } |
| |
| static size_t put_float64fix(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path, |
| float64_value_t *value) |
| { |
| size_t len; |
| |
| len = put_json_prefix(out, path, "\"v\""); |
| len += plain_text_put_format(out, "%lld.%lld", |
| value->val1, value->val2); |
| len += put_json_postfix(out); |
| return len; |
| } |
| |
| static size_t put_bool(struct lwm2m_output_context *out, |
| struct lwm2m_obj_path *path, |
| bool value) |
| { |
| size_t len; |
| |
| len = put_json_prefix(out, path, "\"bv\""); |
| len += plain_text_put_format(out, "%s", value ? "true" : "false"); |
| len += put_json_postfix(out); |
| return (size_t)len; |
| } |
| |
| const struct lwm2m_writer json_writer = { |
| put_begin, |
| put_end, |
| put_begin_ri, |
| put_end_ri, |
| put_s8, |
| put_s16, |
| put_s32, |
| put_s64, |
| put_string, |
| put_float32fix, |
| put_float64fix, |
| put_bool, |
| NULL |
| }; |
| |
| static int parse_path(const u8_t *buf, u16_t buflen, |
| struct lwm2m_obj_path *path) |
| { |
| int ret = 0; |
| int pos = 0; |
| u16_t val; |
| u8_t c = 0; |
| |
| do { |
| val = 0; |
| c = buf[pos]; |
| /* we should get a value first - consume all numbers */ |
| while (pos < buflen && isdigit(c)) { |
| val = val * 10 + (c - '0'); |
| c = buf[++pos]; |
| } |
| |
| /* |
| * Slash will mote thing forward |
| * and the end will be when pos == pl |
| */ |
| if (c == '/' || pos == buflen) { |
| SYS_LOG_DBG("Setting %u = %u", ret, val); |
| if (ret == 0) { |
| path->obj_id = val; |
| } else if (ret == 1) { |
| path->obj_inst_id = val; |
| } else if (ret == 2) { |
| path->res_id = val; |
| } |
| |
| ret++; |
| pos++; |
| } else { |
| SYS_LOG_ERR("Error: illegal char '%c' at pos:%d", |
| c, pos); |
| return -1; |
| } |
| } while (pos < buflen); |
| |
| return ret; |
| } |
| |
| int do_write_op_json(struct lwm2m_engine_obj *obj, |
| struct lwm2m_engine_context *context) |
| { |
| struct lwm2m_input_context *in = context->in; |
| struct lwm2m_obj_path *path = context->path; |
| struct lwm2m_engine_obj_field *obj_field; |
| struct lwm2m_engine_obj_inst *obj_inst = NULL; |
| struct lwm2m_engine_res_inst *res = NULL; |
| struct json_data json; |
| u8_t olv = 0; |
| u8_t created; |
| int i, r; |
| u8_t mode = MODE_NONE; |
| |
| olv = path->level; |
| |
| while (json_next_token(in, &json)) { |
| i = 0; |
| created = 0; |
| if (json.name[0] == 'n') { |
| path->level = parse_path(json.value, json.value_len, |
| path); |
| if (i > 0) { |
| r = lwm2m_get_or_create_engine_obj(context, |
| &obj_inst, |
| &created); |
| if (r < 0) { |
| return r; |
| } |
| mode |= MODE_INSTANCE; |
| } |
| } else { |
| /* HACK: assume value node: can it be anything else? */ |
| mode |= MODE_VALUE; |
| /* FIXME swap in->cpkt.pkt->frag w/ value buffer */ |
| } |
| |
| if (mode == MODE_READY) { |
| if (!obj_inst) { |
| return -EINVAL; |
| } |
| |
| obj_field = lwm2m_get_engine_obj_field(obj, |
| path->res_id); |
| /* |
| * if obj_field is not found, |
| * treat as an optional resource |
| */ |
| if (!obj_field) { |
| /* |
| * TODO: support BOOTSTRAP WRITE where optional |
| * resources are ignored |
| */ |
| if (context->operation != LWM2M_OP_CREATE) { |
| return -ENOENT; |
| } |
| |
| goto skip_optional; |
| } |
| |
| if ((obj_field->permissions & LWM2M_PERM_W) != |
| LWM2M_PERM_W) { |
| return -EPERM; |
| } |
| |
| if (!obj_inst->resources || |
| obj_inst->resource_count == 0) { |
| return -EINVAL; |
| } |
| |
| for (i = 0; i < obj_inst->resource_count; i++) { |
| if (obj_inst->resources[i].res_id == |
| path->res_id) { |
| res = &obj_inst->resources[i]; |
| break; |
| } |
| } |
| |
| if (!res) { |
| return -ENOENT; |
| } |
| |
| lwm2m_write_handler(obj_inst, res, obj_field, context); |
| |
| skip_optional: |
| mode = MODE_NONE; |
| /* FIXME: swap back original in->cpkt.pkt->frag */ |
| path->level = olv; |
| } |
| } |
| |
| return 0; |
| } |