mirror of
https://github.com/ElementsProject/lightning.git
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138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
#include <channeld/channeld_wiregen.h>
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#include <common/json_command.h>
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#include <common/jsonrpc_errors.h>
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#include <common/param.h>
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#include <common/sphinx.h>
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#include <common/utils.h>
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#include <gossipd/gossipd_wiregen.h>
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#include <lightningd/htlc_end.h>
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#include <lightningd/json.h>
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#include <lightningd/jsonrpc.h>
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#include <lightningd/lightningd.h>
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#include <lightningd/log.h>
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#include <lightningd/peer_control.h>
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#include <lightningd/ping.h>
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#include <lightningd/subd.h>
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struct ping_command {
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struct list_node list;
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struct node_id id;
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struct command *cmd;
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};
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static struct ping_command *find_ping_cmd(struct lightningd *ld,
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const struct node_id *id)
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{
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struct ping_command *i;
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list_for_each(&ld->ping_commands, i, list) {
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if (node_id_eq(id, &i->id))
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return i;
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}
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return NULL;
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}
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static void destroy_ping_command(struct ping_command *pc)
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{
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list_del(&pc->list);
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}
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static struct ping_command *new_ping_command(const tal_t *ctx,
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struct lightningd *ld,
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const struct node_id *peer_id,
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struct command *cmd)
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{
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struct ping_command *pc = tal(ctx, struct ping_command);
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pc->id = *peer_id;
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pc->cmd = cmd;
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list_add_tail(&ld->ping_commands, &pc->list);
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tal_add_destructor(pc, destroy_ping_command);
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return pc;
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}
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void ping_reply(struct subd *subd, const u8 *msg)
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{
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u16 totlen;
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bool ok, sent = true;
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struct node_id id;
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struct ping_command *pc;
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log_debug(subd->ld->log, "Got ping reply!");
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ok = fromwire_gossipd_ping_reply(msg, &id, &sent, &totlen);
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pc = find_ping_cmd(subd->ld, &id);
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assert(pc);
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if (!ok)
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was_pending(command_fail(pc->cmd, LIGHTNINGD,
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"Bad reply message"));
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else if (!sent)
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was_pending(command_fail(pc->cmd, LIGHTNINGD, "Unknown peer"));
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else {
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struct json_stream *response = json_stream_success(pc->cmd);
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json_add_num(response, "totlen", totlen);
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was_pending(command_success(pc->cmd, response));
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}
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}
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static struct command_result *json_ping(struct command *cmd,
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const char *buffer,
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const jsmntok_t *obj UNNEEDED,
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const jsmntok_t *params)
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{
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u8 *msg;
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unsigned int *len, *pongbytes;
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struct node_id *id;
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if (!param(cmd, buffer, params,
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p_req("id", param_node_id, &id),
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p_opt_def("len", param_number, &len, 128),
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p_opt_def("pongbytes", param_number, &pongbytes, 128),
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NULL))
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return command_param_failed();
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/* BOLT #1:
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*
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* 1. `type`: a 2-byte big-endian field indicating the type of message
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* 2. `payload`: ...
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* The size of the message is required by the transport layer to fit
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* into a 2-byte unsigned int; therefore, the maximum possible size is
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* 65535 bytes.
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*...
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* 1. type: 18 (`ping`)
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* 2. data:
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* * [`u16`:`num_pong_bytes`]
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* * [`u16`:`byteslen`]
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* * [`byteslen*byte`:`ignored`]
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*/
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if (*len > 65535 - 2 - 2 - 2) {
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return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
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"%u would result in oversize ping", *len);
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}
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/* Note that > 65531 is valid: it means "no pong reply" */
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if (*pongbytes > 65535) {
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return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
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"pongbytes %u > 65535", *pongbytes);
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}
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/* parent is cmd, so when we complete cmd, we free this. */
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new_ping_command(cmd, cmd->ld, id, cmd);
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/* gossipd handles all pinging, even if it's in another daemon. */
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msg = towire_gossipd_ping(NULL, id, *pongbytes, *len);
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subd_send_msg(cmd->ld->gossip, take(msg));
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return command_still_pending(cmd);
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}
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static const struct json_command ping_command = {
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"ping",
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"network",
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json_ping,
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"Send peer {id} a ping of length {len} (default 128) asking for {pongbytes} (default 128)"
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};
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AUTODATA(json_command, &ping_command);
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