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common/json_tok: expose routines to parse addresses.

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These are currently inside lightningd.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2020-07-08 06:20:26 +09:30
committed by Christian Decker
parent 94de18ace7
commit 31b2865791
6 changed files with 141 additions and 123 deletions
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107
lightningd/json.c
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@@ -123,113 +123,6 @@ json_tok_channel_id(const char *buffer, const jsmntok_t *tok,
cid, sizeof(*cid));
}
/**
* segwit_addr_net_decode - Try to decode a Bech32 address and detect
* testnet/mainnet/regtest/signet
*
* This processes the address and returns a string if it is a Bech32
* address specified by BIP173. The string is set whether it is
* testnet ("tb"), mainnet ("bc"), regtest ("bcrt"), or signet ("sb")
* It does not check, witness version and program size restrictions.
*
* Out: witness_version: Pointer to an int that will be updated to contain
* the witness program version (between 0 and 16 inclusive).
* witness_program: Pointer to a buffer of size 40 that will be updated
* to contain the witness program bytes.
* witness_program_len: Pointer to a size_t that will be updated to
* contain the length of bytes in witness_program.
* In: addrz: Pointer to the null-terminated address.
* Returns string containing the human readable segment of bech32 address
*/
static const char *segwit_addr_net_decode(int *witness_version,
uint8_t *witness_program,
size_t *witness_program_len,
const char *addrz,
const struct chainparams *chainparams)
{
if (segwit_addr_decode(witness_version, witness_program,
witness_program_len, chainparams->bip173_name,
addrz))
return chainparams->bip173_name;
else
return NULL;
}
enum address_parse_result
json_to_address_scriptpubkey(const tal_t *ctx,
const struct chainparams *chainparams,
const char *buffer,
const jsmntok_t *tok, const u8 **scriptpubkey)
{
struct bitcoin_address destination;
int witness_version;
/* segwit_addr_net_decode requires a buffer of size 40, and will
* not write to the buffer if the address is too long, so a buffer
* of fixed size 40 will not overflow. */
uint8_t witness_program[40];
size_t witness_program_len;
char *addrz;
const char *bip173;
bool parsed;
bool right_network;
u8 addr_version;
parsed =
ripemd160_from_base58(&addr_version, &destination.addr,
buffer + tok->start, tok->end - tok->start);
if (parsed) {
if (addr_version == chainparams->p2pkh_version) {
*scriptpubkey = scriptpubkey_p2pkh(ctx, &destination);
return ADDRESS_PARSE_SUCCESS;
} else if (addr_version == chainparams->p2sh_version) {
*scriptpubkey =
scriptpubkey_p2sh_hash(ctx, &destination.addr);
return ADDRESS_PARSE_SUCCESS;
} else {
return ADDRESS_PARSE_WRONG_NETWORK;
}
/* Insert other parsers that accept pointer+len here. */
}
/* Generate null-terminated address. */
addrz = tal_dup_arr(ctx, char, buffer + tok->start, tok->end - tok->start, 1);
addrz[tok->end - tok->start] = '\0';
bip173 = segwit_addr_net_decode(&witness_version, witness_program,
&witness_program_len, addrz, chainparams);
if (bip173) {
bool witness_ok = false;
if (witness_version == 0 && (witness_program_len == 20 ||
witness_program_len == 32)) {
witness_ok = true;
}
/* Insert other witness versions here. */
if (witness_ok) {
*scriptpubkey = scriptpubkey_witness_raw(ctx, witness_version,
witness_program, witness_program_len);
parsed = true;
right_network = streq(bip173, chainparams->bip173_name);
}
}
/* Insert other parsers that accept null-terminated string here. */
tal_free(addrz);
if (parsed) {
if (right_network)
return ADDRESS_PARSE_SUCCESS;
else
return ADDRESS_PARSE_WRONG_NETWORK;
}
return ADDRESS_PARSE_UNRECOGNIZED;
}
struct command_result *param_bitcoin_address(struct command *cmd,
const char *name,
const char *buffer,