You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

1208 lines
28 KiB

/* JSON core and helpers */
#include <assert.h>
#include <ccan/build_assert/build_assert.h>
#include <ccan/json_escape/json_escape.h>
#include <ccan/mem/mem.h>
#include <ccan/str/hex/hex.h>
#include <ccan/tal/str/str.h>
#include <ccan/time/time.h>
#include <common/json.h>
#include <common/json_stream.h>
#include <common/overflows.h>
#include <common/utils.h>
#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
const char *json_tok_full(const char *buffer, const jsmntok_t *t)
{
if (t->type == JSMN_STRING)
return buffer + t->start - 1;
return buffer + t->start;
}
/* Include " if it's a string. */
int json_tok_full_len(const jsmntok_t *t)
{
if (t->type == JSMN_STRING)
return t->end - t->start + 2;
return t->end - t->start;
}
bool json_tok_strneq(const char *buffer, const jsmntok_t *tok,
const char *str, size_t len)
{
if (tok->type != JSMN_STRING)
return false;
return memeq(buffer + tok->start, tok->end - tok->start, str, len);
}
bool json_tok_streq(const char *buffer, const jsmntok_t *tok, const char *str)
{
return json_tok_strneq(buffer, tok, str, strlen(str));
}
bool json_tok_startswith(const char *buffer, const jsmntok_t *tok,
const char *prefix)
{
if (tok->type != JSMN_STRING)
return false;
if (tok->end - tok->start < strlen(prefix))
return false;
return memcmp(buffer + tok->start,
prefix, strlen(prefix)) == 0;
}
bool json_tok_endswith(const char *buffer, const jsmntok_t *tok,
const char *suffix)
{
if (tok->type != JSMN_STRING)
return false;
if (tok->end - tok->start < strlen(suffix))
return false;
return memcmp(buffer + tok->end - strlen(suffix),
suffix, strlen(suffix)) == 0;
}
char *json_strdup(const tal_t *ctx, const char *buffer, const jsmntok_t *tok)
{
return tal_strndup(ctx, buffer + tok->start, tok->end - tok->start);
}
bool json_to_u64(const char *buffer, const jsmntok_t *tok,
uint64_t *num)
{
char *end;
unsigned long long l;
l = strtoull(buffer + tok->start, &end, 0);
if (end != buffer + tok->end)
return false;
BUILD_ASSERT(sizeof(l) >= sizeof(*num));
*num = l;
/* Check for overflow */
if (l == ULLONG_MAX && errno == ERANGE)
return false;
if (*num != l)
return false;
return true;
}
bool json_to_s64(const char *buffer, const jsmntok_t *tok, s64 *num)
{
char *end;
long long l;
l = strtoll(buffer + tok->start, &end, 0);
if (end != buffer + tok->end)
return false;
BUILD_ASSERT(sizeof(l) >= sizeof(*num));
*num = l;
/* Check for overflow/underflow */
if ((l == LONG_MAX || l == LONG_MIN) && errno == ERANGE)
return false;
/* Check if the number did not fit in `s64` (in case `long long`
is a bigger type). */
if (*num != l)
return false;
return true;
}
bool json_to_millionths(const char *buffer, const jsmntok_t *tok,
u64 *millionths)
{
int decimal_places = -1;
bool has_digits = 0;
*millionths = 0;
for (int i = tok->start; i < tok->end; i++) {
if (isdigit(buffer[i])) {
has_digits = true;
/* Ignore too much precision */
if (decimal_places >= 0 && ++decimal_places > 6)
continue;
if (mul_overflows_u64(*millionths, 10))
return false;
*millionths *= 10;
if (add_overflows_u64(*millionths, buffer[i] - '0'))
return false;
*millionths += buffer[i] - '0';
} else if (buffer[i] == '.') {
if (decimal_places != -1)
return false;
decimal_places = 0;
} else
return false;
}
if (!has_digits)
return false;
if (decimal_places == -1)
decimal_places = 0;
while (decimal_places < 6) {
if (mul_overflows_u64(*millionths, 10))
return false;
*millionths *= 10;
decimal_places++;
}
return true;
}
bool json_to_number(const char *buffer, const jsmntok_t *tok,
unsigned int *num)
{
uint64_t u64;
if (!json_to_u64(buffer, tok, &u64))
return false;
*num = u64;
/* Just in case it doesn't fit. */
if (*num != u64)
return false;
return true;
}
bool json_to_u16(const char *buffer, const jsmntok_t *tok,
short unsigned int *num)
{
uint64_t u64;
if (!json_to_u64(buffer, tok, &u64))
return false;
*num = u64;
/* Just in case it doesn't fit. */
if (*num != u64)
return false;
return true;
}
bool json_to_u32(const char *buffer, const jsmntok_t *tok,
uint32_t *num)
{
uint64_t u64;
if (!json_to_u64(buffer, tok, &u64))
return false;
*num = u64;
/* Just in case it doesn't fit. */
if (*num != u64)
return false;
return true;
}
bool json_to_int(const char *buffer, const jsmntok_t *tok, int *num)
{
s64 tmp;
if (!json_to_s64(buffer, tok, &tmp))
return false;
*num = tmp;
/* Just in case it doesn't fit. */
if (*num != tmp)
return false;
return true;
}
bool json_to_errcode(const char *buffer, const jsmntok_t *tok, errcode_t *errcode)
{
s64 tmp;
if (!json_to_s64(buffer, tok, &tmp))
return false;
*errcode = tmp;
/* Just in case it doesn't fit. */
if (*errcode != tmp)
return false;
return true;
}
bool json_to_bool(const char *buffer, const jsmntok_t *tok, bool *b)
{
if (tok->type != JSMN_PRIMITIVE)
return false;
if (memeqstr(buffer + tok->start, tok->end - tok->start, "true")) {
*b = true;
return true;
}
if (memeqstr(buffer + tok->start, tok->end - tok->start, "false")) {
*b = false;
return true;
}
return false;
}
bool json_to_sha256(const char *buffer, const jsmntok_t *tok, struct sha256 *dest)
{
if (tok->type != JSMN_STRING)
return false;
return hex_decode(buffer + tok->start, tok->end - tok->start, dest,
sizeof(struct sha256));
}
u8 *json_tok_bin_from_hex(const tal_t *ctx, const char *buffer, const jsmntok_t *tok)
{
u8 *result;
size_t hexlen, rawlen;
hexlen = tok->end - tok->start;
rawlen = hex_data_size(hexlen);
result = tal_arr(ctx, u8, rawlen);
if (!hex_decode(buffer + tok->start, hexlen, result, rawlen))
return tal_free(result);
return result;
}
bool json_tok_is_num(const char *buffer, const jsmntok_t *tok)
{
if (tok->type != JSMN_PRIMITIVE)
return false;
for (int i = tok->start; i < tok->end; i++)
if (!cisdigit(buffer[i]))
return false;
return true;
}
bool json_tok_is_null(const char *buffer, const jsmntok_t *tok)
{
if (tok->type != JSMN_PRIMITIVE)
return false;
return buffer[tok->start] == 'n';
}
const jsmntok_t *json_next(const jsmntok_t *tok)
{
const jsmntok_t *t;
size_t i;
for (t = tok + 1, i = 0; i < tok->size; i++)
t = json_next(t);
return t;
}
const jsmntok_t *json_get_membern(const char *buffer, const jsmntok_t tok[],
const char *label, size_t len)
{
const jsmntok_t *t;
size_t i;
if (tok->type != JSMN_OBJECT)
return NULL;
json_for_each_obj(i, t, tok)
if (json_tok_strneq(buffer, t, label, len))
return t + 1;
return NULL;
}
const jsmntok_t *json_get_member(const char *buffer, const jsmntok_t tok[],
const char *label)
{
return json_get_membern(buffer, tok, label, strlen(label));
}
const jsmntok_t *json_get_arr(const jsmntok_t tok[], size_t index)
{
const jsmntok_t *t;
size_t i;
if (tok->type != JSMN_ARRAY)
return NULL;
json_for_each_arr(i, t, tok) {
if (index == 0)
return t;
index--;
}
return NULL;
}
/*-----------------------------------------------------------------------------
JSMN Result Validation Starts
-----------------------------------------------------------------------------*/
/*~ LIBJSMN is a fast, small JSON parsing library.
*
* "Fast, small" means it does not, in fact, do a
* lot of checking for invalid JSON.
*
* For example, by itself it would accept the strings
* `{"1" "2" "3" "4"}` and `["key": 1 2 3 4]` as valid.
* Obviously those are not in any way valid JSON.
*
* This part of the code performs some filtering so
* that at least some of the invalid JSON that
* LIBJSMN accepts, will be rejected by
* json_parse_input. It also checks that strings are valid UTF-8.
*/
/*~ These functions are used in JSMN validation.
*
* The calling convention is that the "current" token
* is passed in as the first argument, and after the
* validator, is returned from the function.
*
* p = validate_jsmn_datum(p, end, valid);
*
* The reason has to do with typical C ABIs.
* Usually, the first few arguments are passed in via
* register, and the return value is also returned
* via register.
* This calling convention generally ensures that
* the current token pointer `p` is always in a
* register and is never forced into memory by the
* compiler.
*
* These functions are pre-declared here as they
* are interrecursive.
* Note that despite the recursion, `p` is only ever
* advanced, and there is only ever one `p` value,
* thus the overall algorithm is strict O(n)
* (*not* amortized) in time.
* The recursion does mean the algorithm is O(d)
* in memory (specifically stack frames), where d
* is the nestedness of objects in the input.
* This may become an issue later if we are in a
* stack-limited environment, such as if we actually
* went and used threads.
*/
/* Validate a *single* datum. */
static const jsmntok_t *
validate_jsmn_datum(const char *buf,
const jsmntok_t *p,
const jsmntok_t *end,
bool *valid);
/*~ Validate a key-value pair.
*
* In JSMN, objects are not dictionaries.
* Instead, they are a sequence of datums.
*
* In fact, objects and arrays in JSMN are "the same",
* they only differ in delimiter characters.
*
* Of course, in "real" JSON, an object is a dictionary
* of key-value pairs.
*
* So what JSMN does is that the syntax "key": "value"
* is considered a *single* datum, a string "key"
* that contains a value "value".
*
* Indeed, JSMN accepts `["key": "value"]` as well as
* `{"item1", "item2"}`.
* The entire point of the validate_jsmn_result function
* is to reject such improper arrays and objects.
*/
static const jsmntok_t *
validate_jsmn_keyvalue(const char *buf,
const jsmntok_t *p,
const jsmntok_t *end,
bool *valid);
static const jsmntok_t *
validate_jsmn_datum(const char *buf,
const jsmntok_t *p,
const jsmntok_t *end,
bool *valid)
{
int i;
int sz;
if (p >= end) {
*valid = false;
return p;
}
switch (p->type) {
case JSMN_STRING:
if (!utf8_check(buf + p->start, p->end - p->start))
*valid = false;
/* Fall thru */
case JSMN_UNDEFINED:
case JSMN_PRIMITIVE:
/* These types should not have sub-datums. */
if (p->size != 0)
*valid = false;
else
++p;
break;
case JSMN_ARRAY:
/* Save the array size; we will advance p. */
sz = p->size;
++p;
for (i = 0; i < sz; ++i) {
/* Arrays should only contain standard JSON datums. */
p = validate_jsmn_datum(buf, p, end, valid);
if (!*valid)
break;
}
break;
case JSMN_OBJECT:
/* Save the object size; we will advance p. */
sz = p->size;
++p;
for (i = 0; i < sz; ++i) {
/* Objects should only contain key-value pairs. */
p = validate_jsmn_keyvalue(buf, p, end, valid);
if (!*valid)
break;
}
break;
default:
*valid = false;
break;
}
return p;
}
/* Key-value pairs *must* be strings with size 1. */
static inline const jsmntok_t *
validate_jsmn_keyvalue(const char *buf,
const jsmntok_t *p,
const jsmntok_t *end,
bool *valid)
{
if (p >= end) {
*valid = false;
return p;
}
/* Check key.
*
* JSMN parses the syntax `"key": "value"` as a
* JSMN_STRING of size 1, containing the value
* datum as a sub-datum.
*
* Thus, keys in JSON objects are really strings
* that "contain" the value, thus we check if
* the size is 1.
*
* JSMN supports a non-standard syntax such as
* `"key": 1 2 3 4`, which it considers as a
* string object that contains a sequence of
* sub-datums 1 2 3 4.
* The check below that p->size == 1 also
* incidentally rejects that non-standard
* JSON.
*/
if (p->type != JSMN_STRING || p->size != 1
|| !utf8_check(buf + p->start, p->end - p->start)) {
*valid = false;
return p;
}
++p;
return validate_jsmn_datum(buf, p, end, valid);
}
/** validate_jsmn_parse_output
*
* @brief Validates the result of jsmn_parse.
*
* @desc LIBJMSN is a small fast library, not a
* comprehensive library.
*
* This simply means that LIBJSMN will accept a
* *lot* of very strange text that is technically
* not JSON.
*
* For example, LIBJSMN would accept the strings
* `{"1" "2" "3" "4"}` and `["key": 1 2 3 4]` as valid.
*
* This can lead to strange sequences of jsmntok_t
* objects.
* Unfortunately, most of our code assumes that
* the data fed into our JSON-RPC interface is
* valid JSON, and in particular is not invalid
* JSON that tickles LIBJSMN into emitting
* strange sequences of `jsmntok_t`.
*
* This function detects such possible problems
* and returns false if such an issue is found.
* If so, it is probably unsafe to pass the
* `jsmntok_t` generated by LIBJSMN to any other
* parts of our code.
*
* @param p - The first jsmntok_t token to process.
* This function does not assume that semantically
* only one JSON datum is processed; it does expect
* a sequence of complete JSON datums (which is
* what LIBJSMN *should* output).
* @param end - One past the end of jsmntok_t.
* Basically, this function is assured to read tokens
* starting at p up to end - 1.
* If p >= end, this will not validate anything and
* trivially return true.
*
* @return true if there appears to be no problem
* with the jsmntok_t sequence outputted by
* `jsmn_parse`, false otherwise.
*/
static bool
validate_jsmn_parse_output(const char *buf,
const jsmntok_t *p, const jsmntok_t *end)
{
bool valid = true;
while (p < end && valid)
p = validate_jsmn_datum(buf, p, end, &valid);
return valid;
}
/*-----------------------------------------------------------------------------
JSMN Result Validation Ends
-----------------------------------------------------------------------------*/
void toks_reset(jsmntok_t *toks)
{
assert(tal_count(toks) >= 1);
toks[0].type = JSMN_UNDEFINED;
}
jsmntok_t *toks_alloc(const tal_t *ctx)
{
jsmntok_t *toks = tal_arr(ctx, jsmntok_t, 10);
toks_reset(toks);
return toks;
}
bool json_parse_input(jsmn_parser *parser,
jsmntok_t **toks,
const char *input, int len,
bool *complete)
{
int ret;
again:
ret = jsmn_parse(parser, input, len, *toks, tal_count(*toks) - 1);
switch (ret) {
case JSMN_ERROR_INVAL:
return false;
case JSMN_ERROR_NOMEM:
tal_resize(toks, tal_count(*toks) * 2);
goto again;
}
/* Check whether we read at least one full root element, i.e., root
* element has its end set. */
if ((*toks)[0].type == JSMN_UNDEFINED || (*toks)[0].end == -1) {
*complete = false;
return true;
}
/* If we read a partial element at the end of the stream we'll get a
* ret=JSMN_ERROR_PART, but due to the previous check we know we read at
* least one full element, so count tokens that are part of this root
* element. */
ret = json_next(*toks) - *toks;
if (!validate_jsmn_parse_output(input, *toks, *toks + ret))
return false;
/* Cut to length and return. */
tal_resize(toks, ret + 1);
7 years ago
/* Make sure last one is always referenceable. */
(*toks)[ret].type = -1;
(*toks)[ret].start = (*toks)[ret].end = (*toks)[ret].size = 0;
*complete = true;
return true;
}
jsmntok_t *json_parse_simple(const tal_t *ctx, const char *input, int len)
{
bool complete;
jsmn_parser parser;
jsmntok_t *toks = toks_alloc(ctx);
jsmn_init(&parser);
if (!json_parse_input(&parser, &toks, input, len, &complete)
|| !complete)
return tal_free(toks);
return toks;
}
const char *jsmntype_to_string(jsmntype_t t)
{
switch (t) {
case JSMN_UNDEFINED :
return "UNDEFINED";
case JSMN_OBJECT :
return "OBJECT";
case JSMN_ARRAY :
return "ARRAY";
case JSMN_STRING :
return "STRING";
case JSMN_PRIMITIVE :
return "PRIMITIVE";
}
return "INVALID";
}
void json_tok_print(const char *buffer, const jsmntok_t *tok)
{
const jsmntok_t *first = tok;
const jsmntok_t *last = json_next(tok);
printf("size: %d, count: %td\n", tok->size, last - first);
while (first != last) {
printf("%td. %.*s, %s\n", first - tok,
first->end - first->start, buffer + first->start,
jsmntype_to_string(first->type));
first++;
}
printf("\n");
}
jsmntok_t *json_tok_copy(const tal_t *ctx, const jsmntok_t *tok)
{
return tal_dup_arr(ctx, jsmntok_t, tok, json_next(tok) - tok, 0);
}
void json_tok_remove(jsmntok_t **tokens,
jsmntok_t *obj_or_array, const jsmntok_t *tok, size_t num)
{
const jsmntok_t *src = tok;
const jsmntok_t *end = json_next(*tokens);
jsmntok_t *dest = *tokens + (tok - *tokens);
int remove_count;
assert(*tokens);
assert(obj_or_array->type == JSMN_ARRAY
|| obj_or_array->type == JSMN_OBJECT);
/* obj_or_array must be inside tokens, and tok must be inside
* obj_or_array */
assert(obj_or_array >= *tokens
&& obj_or_array < *tokens + tal_count(*tokens));
assert(tok >= obj_or_array
&& tok < *tokens + tal_count(*tokens));
for (int i = 0; i < num; i++)
src = json_next(src);
/* Don't give us a num which goes over end of obj_or_array. */
assert(src <= json_next(obj_or_array));
remove_count = src - tok;
memmove(dest, src, sizeof(jsmntok_t) * (end - src));
/* Subtract first: this ptr may move after tal_resize! */
obj_or_array->size -= num;
tal_resize(tokens, tal_count(*tokens) - remove_count);
}
/* talfmt take a ctx pointer and return NULL or a valid pointer.
* fmt takes the argument, and returns a bool.
*
* This function returns NULL on success, or errmsg on failure.
*/
static const char *handle_percent(const char *buffer,
const jsmntok_t *tok,
va_list *ap)
{
void *ctx;
const char *fmtname;
/* This is set to (dummy) json_scan if it's a non-tal fmt */
ctx = va_arg(*ap, void *);
fmtname = va_arg(*ap, const char *);
if (ctx != json_scan) {
void *(*talfmt)(void *, const char *, const jsmntok_t *);
void **p;
p = va_arg(*ap, void **);
talfmt = va_arg(*ap, void *(*)(void *, const char *, const jsmntok_t *));
*p = talfmt(ctx, buffer, tok);
if (*p != NULL)
return NULL;
} else {
bool (*fmt)(const char *, const jsmntok_t *, void *);
void *p;
p = va_arg(*ap, void *);
fmt = va_arg(*ap, bool (*)(const char *, const jsmntok_t *, void *));
if (fmt(buffer, tok, p))
return NULL;
}
return tal_fmt(tmpctx, "%s could not parse %.*s",
fmtname,
json_tok_full_len(tok),
json_tok_full(buffer, tok));
}
/* GUIDE := OBJ | ARRAY | '%'
* OBJ := '{' FIELDLIST '}'
* FIELDLIST := FIELD [',' FIELD]*
* FIELD := LITERAL ':' FIELDVAL
* FIELDVAL := OBJ | ARRAY | LITERAL | '%'
* ARRAY := '[' ARRLIST ']'
* ARRLIST := ARRELEM [',' ARRELEM]*
* ARRELEM := NUMBER ':' FIELDVAL
*/
static void parse_literal(const char **guide,
const char **literal,
size_t *len)
{
*literal = *guide;
*len = strspn(*guide,
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789"
"_-");
*guide += *len;
}
static void parse_number(const char **guide, u32 *number)
{
char *endp;
long int l;
l = strtol(*guide, &endp, 10);
assert(endp != *guide);
assert(errno != ERANGE);
/* Test for overflow */
*number = l;
assert(*number == l);
*guide = endp;
}
static char guide_consume_one(const char **guide)
{
char c = **guide;
(*guide)++;
return c;
}
static void guide_must_be(const char **guide, char c)
{
char actual = guide_consume_one(guide);
assert(actual == c);
}
/* Recursion: return NULL on success, errmsg on fail */
static const char *parse_obj(const char *buffer,
const jsmntok_t *tok,
const char **guide,
va_list *ap);
static const char *parse_arr(const char *buffer,
const jsmntok_t *tok,
const char **guide,
va_list *ap);
static const char *parse_guide(const char *buffer,
const jsmntok_t *tok,
const char **guide,
va_list *ap)
{
const char *errmsg;
if (**guide == '{') {
errmsg = parse_obj(buffer, tok, guide, ap);
if (errmsg)
return errmsg;
} else if (**guide == '[') {
errmsg = parse_arr(buffer, tok, guide, ap);
if (errmsg)
return errmsg;
} else {
guide_must_be(guide, '%');
errmsg = handle_percent(buffer, tok, ap);
if (errmsg)
return errmsg;
}
return NULL;
}
static const char *parse_fieldval(const char *buffer,
const jsmntok_t *tok,
const char **guide,
va_list *ap)
{
const char *errmsg;
if (**guide == '{') {
errmsg = parse_obj(buffer, tok, guide, ap);
if (errmsg)
return errmsg;
} else if (**guide == '[') {
errmsg = parse_arr(buffer, tok, guide, ap);
if (errmsg)
return errmsg;
} else if (**guide == '%') {
guide_consume_one(guide);
errmsg = handle_percent(buffer, tok, ap);
if (errmsg)
return errmsg;
} else {
const char *literal;
size_t len;
/* Literal must match exactly (modulo quotes for strings) */
parse_literal(guide, &literal, &len);
if (!memeq(buffer + tok->start, tok->end - tok->start,
literal, len)) {
return tal_fmt(tmpctx,
"%.*s does not match expected %.*s",
json_tok_full_len(tok),
json_tok_full(buffer, tok),
(int)len, literal);
}
}
return NULL;
}
static const char *parse_field(const char *buffer,
const jsmntok_t *tok,
const char **guide,
va_list *ap)
{
const jsmntok_t *member;
size_t len;
const char *memname;
parse_literal(guide, &memname, &len);
guide_must_be(guide, ':');
member = json_get_membern(buffer, tok, memname, len);
if (!member) {
return tal_fmt(tmpctx, "object does not have member %.*s",
(int)len, memname);
}
return parse_fieldval(buffer, member, guide, ap);
}
static const char *parse_fieldlist(const char *buffer,
const jsmntok_t *tok,
const char **guide,
va_list *ap)
{
for (;;) {
const char *errmsg;
errmsg = parse_field(buffer, tok, guide, ap);
if (errmsg)
return errmsg;
if (**guide != ',')
break;
guide_consume_one(guide);
}
return NULL;
}
static const char *parse_obj(const char *buffer,
const jsmntok_t *tok,
const char **guide,
va_list *ap)
{
const char *errmsg;
guide_must_be(guide, '{');
if (tok->type != JSMN_OBJECT) {
return tal_fmt(tmpctx, "token is not an object: %.*s",
json_tok_full_len(tok),
json_tok_full(buffer, tok));
}
errmsg = parse_fieldlist(buffer, tok, guide, ap);
if (errmsg)
return errmsg;
guide_must_be(guide, '}');
return NULL;
}
static const char *parse_arrelem(const char *buffer,
const jsmntok_t *tok,
const char **guide,
va_list *ap)
{
const jsmntok_t *member;
u32 idx;
parse_number(guide, &idx);
guide_must_be(guide, ':');
member = json_get_arr(tok, idx);
if (!member) {
return tal_fmt(tmpctx, "token has no index %u: %.*s",
idx,
json_tok_full_len(tok),
json_tok_full(buffer, tok));
}
return parse_fieldval(buffer, member, guide, ap);
}
static const char *parse_arrlist(const char *buffer,
const jsmntok_t *tok,
const char **guide,
va_list *ap)
{
const char *errmsg;
for (;;) {
errmsg = parse_arrelem(buffer, tok, guide, ap);
if (errmsg)
return errmsg;
if (**guide != ',')
break;
guide_consume_one(guide);
}
return NULL;
}
static const char *parse_arr(const char *buffer,
const jsmntok_t *tok,
const char **guide,
va_list *ap)
{
const char *errmsg;
guide_must_be(guide, '[');
if (tok->type != JSMN_ARRAY) {
return tal_fmt(tmpctx, "token is not an array: %.*s",
json_tok_full_len(tok),
json_tok_full(buffer, tok));
}
errmsg = parse_arrlist(buffer, tok, guide, ap);
if (errmsg)
return errmsg;
guide_must_be(guide, ']');
return NULL;
}
const char *json_scanv(const tal_t *ctx,
const char *buffer,
const jsmntok_t *tok,
const char *guide,
va_list ap)
{
va_list cpy;
const char *orig_guide = guide, *errmsg;
/* We need this, since &ap doesn't work on some platforms... */
va_copy(cpy, ap);
errmsg = parse_guide(buffer, tok, &guide, &cpy);
va_end(cpy);
if (errmsg) {
return tal_fmt(ctx, "Parsing '%.*s': %s",
(int)(guide - orig_guide), orig_guide,
errmsg);
}
assert(guide[0] == '\0');
return NULL;
}
const char *json_scan(const tal_t *ctx,
const char *buffer,
const jsmntok_t *tok,
const char *guide,
...)
{
va_list ap;
const char *ret;
va_start(ap, guide);
ret = json_scanv(ctx, buffer, tok, guide, ap);
va_end(ap);
return ret;
}
void json_add_num(struct json_stream *result, const char *fieldname, unsigned int value)
{
json_add_member(result, fieldname, false, "%u", value);
}
void json_add_u64(struct json_stream *result, const char *fieldname,
uint64_t value)
{
json_add_member(result, fieldname, false, "%"PRIu64, value);
}
void json_add_s64(struct json_stream *result, const char *fieldname,
int64_t value)
{
json_add_member(result, fieldname, false, "%"PRIi64, value);
}
void json_add_u32(struct json_stream *result, const char *fieldname,
uint32_t value)
{
json_add_member(result, fieldname, false, "%u", value);
}
void json_add_s32(struct json_stream *result, const char *fieldname,
int32_t value)
{
json_add_member(result, fieldname, false, "%d", value);
}
void json_add_literal(struct json_stream *result, const char *fieldname,
const char *literal, int len)
{
/* Literal may contain quotes, so bypass normal checks */
char *dest = json_member_direct(result, fieldname, strlen(literal));
if (dest)
memcpy(dest, literal, strlen(literal));
}
void json_add_stringn(struct json_stream *result, const char *fieldname,
const char *value TAKES, size_t value_len)
{
json_add_member(result, fieldname, true, "%.*s", (int)value_len, value);
if (taken(value))
tal_free(value);
}
void json_add_string(struct json_stream *result, const char *fieldname, const char *value TAKES)
{
json_add_stringn(result, fieldname, value, strlen(value));
}
void json_add_bool(struct json_stream *result, const char *fieldname, bool value)
{
json_add_member(result, fieldname, false, value ? "true" : "false");
}
void json_add_null(struct json_stream *stream, const char *fieldname)
{
json_add_member(stream, fieldname, false, "null");
}
void json_add_hex(struct json_stream *js, const char *fieldname,
const void *data, size_t len)
{
/* Size without NUL term */
size_t hexlen = hex_str_size(len) - 1;
char *dest;
dest = json_member_direct(js, fieldname, 1 + hexlen + 1);
if (dest) {
dest[0] = '"';
if (!hex_encode(data, len, dest + 1, hexlen + 1))
abort();
dest[1+hexlen] = '"';
}
}
void json_add_hex_talarr(struct json_stream *result,
const char *fieldname,
const tal_t *data)
{
json_add_hex(result, fieldname, data, tal_bytelen(data));
}
void json_add_escaped_string(struct json_stream *result, const char *fieldname,
const struct json_escape *esc TAKES)
{
/* Already escaped, don't re-escape! */
char *dest = json_member_direct(result, fieldname,
1 + strlen(esc->s) + 1);
if (dest) {
dest[0] = '"';
memcpy(dest + 1, esc->s, strlen(esc->s));
dest[1+strlen(esc->s)] = '"';
}
if (taken(esc))
tal_free(esc);
}
void json_add_timeabs(struct json_stream *result, const char *fieldname,
struct timeabs t)
{
json_add_member(result, fieldname, false, "%" PRIu64 ".%03" PRIu64,
(u64)t.ts.tv_sec, (u64)t.ts.tv_nsec / 1000000);
}
void json_add_time(struct json_stream *result, const char *fieldname,
struct timespec ts)
{
char timebuf[100];
snprintf(timebuf, sizeof(timebuf), "%lu.%09u",
(unsigned long)ts.tv_sec,
(unsigned)ts.tv_nsec);
json_add_string(result, fieldname, timebuf);
}
void json_add_timeiso(struct json_stream *result,
const char *fieldname,
struct timeabs *time)
{
char iso8601_msec_fmt[sizeof("YYYY-mm-ddTHH:MM:SS.%03dZ")];
char iso8601_s[sizeof("YYYY-mm-ddTHH:MM:SS.nnnZ")];
strftime(iso8601_msec_fmt, sizeof(iso8601_msec_fmt),
"%FT%T.%%03dZ", gmtime(&time->ts.tv_sec));
snprintf(iso8601_s, sizeof(iso8601_s),
iso8601_msec_fmt, (int) time->ts.tv_nsec / 1000000);
json_add_string(result, fieldname, iso8601_s);
}
void json_add_tok(struct json_stream *result, const char *fieldname,
const jsmntok_t *tok, const char *buffer)
{
char *space;
assert(tok->type != JSMN_UNDEFINED);
space = json_member_direct(result, fieldname, json_tok_full_len(tok));
memcpy(space, json_tok_full(buffer, tok), json_tok_full_len(tok));
}
void json_add_errcode(struct json_stream *result, const char *fieldname,
errcode_t code)
{
json_add_member(result, fieldname, false, "%"PRIerrcode, code);
}
void json_add_invstring(struct json_stream *result, const char *invstring)
{
#if EXPERIMENTAL_FEATURES
if (strstarts(invstring, "lni"))
json_add_string(result, "bolt12", invstring);
else
#endif
json_add_string(result, "bolt11", invstring);
}