/* * Copyright 2014 Con Kolivas * * 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 3 of the License, or (at your option) * any later version. See COPYING for more details. */ #include "config.h" #include #include #include #include #include "ckpool.h" #include "libckpool.h" #include "bitcoin.h" #include "uthash.h" #include "utlist.h" #include "sha2.h" static const char *workpadding = "000000800000000000000000000000000000000000000000000000000000000000000000000000000000000080020000"; static const char *scriptsig_header = "01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff"; static uchar scriptsig_header_bin[41]; static char pubkeytxnbin[25]; static char pubkeytxn[52]; static uint64_t enonce1_64; struct workbase { /* Hash table data */ UT_hash_handle hh; int id; char idstring[12]; time_t gentime; /* GBT/shared variables */ char target[68]; double diff; uint32_t version; uint32_t curtime; char prevhash[68]; char ntime[12]; uint32_t ntime32; char bbversion[12]; char nbit[12]; uint64_t coinbasevalue; int height; char *flags; int transactions; char *txn_data; int merkles; char merklehash[16][68]; char merklebin[16][32]; json_t *merkle_array; /* Template variables, lengths are binary lengths! */ char coinb1[256]; // coinbase1 uchar coinb1bin[128]; int coinb1len; // length of above char enonce1const[32]; // extranonce1 section that is constant uchar enonce1constbin[16]; int enonce1constlen; // length of above - usually zero unless proxying int enonce1varlen; // length of unique extranonce1 string for each worker - usually 8 char enonce2const[16]; // extranonce2 section that is constant uchar enonce2constbin[8]; int enonce2constlen; // length of above - usually zero unless proxying int enonce2varlen; // length of space left for extranonce2 - usually 8 char coinb2[128]; // coinbase2 uchar coinb2bin[64]; int coinb2len; // length of above /* Cached header binary */ char headerbin[112]; }; typedef struct workbase workbase_t; /* For protecting the hashtable data */ static cklock_t workbase_lock; /* For the hashtable of all workbases */ static workbase_t *workbases; static workbase_t *current_workbase; static int workbase_id; static int blockchange_id; static char lasthash[68]; struct stratum_msg { struct stratum_msg *next; struct stratum_msg *prev; json_t *json_msg; int client_id; }; typedef struct stratum_msg stratum_msg_t; /* For protecting the stratum msg data */ static pthread_mutex_t stratum_recv_lock; static pthread_mutex_t stratum_send_lock; /* For signalling the threads to wake up and do work */ static pthread_cond_t stratum_recv_cond; static pthread_cond_t stratum_send_cond; /* For the linked list of all queued messages */ static stratum_msg_t *stratum_recvs; static stratum_msg_t *stratum_sends; /* Per client stratum instance, to be further expanded */ struct stratum_instance { UT_hash_handle hh; int id; char enonce1[20]; char enonce1bin[8]; int diff; /* Current diff */ int old_diff; /* Previous diff */ int diff_change_job_id; /* Last job_id we changed diff */ double dsps; /* Diff shares per second */ tv_t ldc; /* Last diff change */ int ssdc; /* Shares since diff change */ tv_t last_share; int absolute_shares; int diff_shares; tv_t first_share; bool authorised; bool disconnected; char *useragent; char *workername; int user_id; }; typedef struct stratum_instance stratum_instance_t; static stratum_instance_t *stratum_instances; static cklock_t instance_lock; /* No error checking with these, make sure we know they're valid already! */ static inline void json_strcpy(char *buf, json_t *val, const char *key) { strcpy(buf, json_string_value(json_object_get(val, key))); } static inline void json_dblcpy(double *dbl, json_t *val, const char *key) { *dbl = json_real_value(json_object_get(val, key)); } static inline void json_uintcpy(uint32_t *u32, json_t *val, const char *key) { *u32 = (uint32_t)json_integer_value(json_object_get(val, key)); } static inline void json_uint64cpy(uint64_t *u64, json_t *val, const char *key) { *u64 = (uint64_t)json_integer_value(json_object_get(val, key)); } static inline void json_intcpy(int *i, json_t *val, const char *key) { *i = json_integer_value(json_object_get(val, key)); } static inline void json_strdup(char **buf, json_t *val, const char *key) { *buf = strdup(json_string_value(json_object_get(val, key))); } static void generate_coinbase(ckpool_t *ckp, workbase_t *wb) { char header[228]; int len, ofs = 0; uint64_t *u64; tv_t now; /* Strings in wb should have been zero memset prior. Generate binary * templates first, then convert to hex */ memcpy(wb->coinb1bin, scriptsig_header_bin, 41); ofs += 41; // Fixed header length; ofs++; // Script length is filled in at the end @wb->coinb1bin[41]; /* Put block height at start of template */ ofs += ser_number(wb->coinb1bin + ofs, wb->height); /* Followed by flag */ len = strlen(wb->flags) / 2; wb->coinb1bin[ofs++] = len; hex2bin(wb->coinb1bin + ofs, wb->flags, len); ofs += len; /* Followed by timestamp */ tv_time(&now); ofs += ser_number(wb->coinb1bin + ofs, now.tv_sec); /* Leave enonce1/2varlen constant at 8 bytes for bitcoind sources */ wb->enonce1varlen = 8; wb->enonce2varlen = 8; wb->coinb1bin[ofs++] = wb->enonce1varlen + wb->enonce2varlen; wb->coinb1len = ofs; len = wb->coinb1len - 41; len += wb->enonce1varlen; len += wb->enonce2varlen; memcpy(wb->coinb2bin, "\x0a\x63\x6b\x70\x6f\x6f\x6c", 7); wb->coinb2len = 7; if (ckp->btcsig) { int siglen = strlen(ckp->btcsig); LOGDEBUG("Len %d sig %s", siglen, ckp->btcsig); if (siglen) { wb->coinb2bin[wb->coinb2len++] = siglen; memcpy(wb->coinb2bin + wb->coinb2len, ckp->btcsig, siglen); wb->coinb2len += siglen; } } len += wb->coinb2len; wb->coinb1bin[41] = len - 1; /* Set the length now */ __bin2hex(wb->coinb1, wb->coinb1bin, wb->coinb1len); LOGDEBUG("Coinb1: %s", wb->coinb1); /* Coinbase 1 complete */ memcpy(wb->coinb2bin + wb->coinb2len, "\xff\xff\xff\xff", 4); wb->coinb2len += 4; wb->coinb2bin[wb->coinb2len++] = 1; u64 = (uint64_t *)&wb->coinb2bin[wb->coinb2len]; *u64 = htole64(wb->coinbasevalue); wb->coinb2len += 8; wb->coinb2bin[wb->coinb2len++] = 25; memcpy(wb->coinb2bin + wb->coinb2len, pubkeytxnbin, 25); wb->coinb2len += 25; wb->coinb2len += 4; // Blank lock __bin2hex(wb->coinb2, wb->coinb2bin, wb->coinb2len); LOGDEBUG("Coinb2: %s", wb->coinb2); /* Coinbase 2 complete */ snprintf(header, 225, "%s%s%s%s%s%s%s", wb->bbversion, wb->prevhash, "0000000000000000000000000000000000000000000000000000000000000000", wb->ntime, wb->nbit, "00000000", /* nonce */ workpadding); LOGDEBUG("Header: %s", header); hex2bin(wb->headerbin, header, 112); } static void stratum_broadcast_update(bool clean); static void clear_workbase(workbase_t *wb) { free(wb->flags); free(wb->txn_data); json_decref(wb->merkle_array); free(wb); } /* This function assumes it will only receive a valid json gbt base template * since checking should have been done earlier, and creates the base template * for generating work templates. */ static void update_base(ckpool_t *ckp) { workbase_t *wb, *tmp, *tmpa; bool new_block = false; json_t *val; char *buf; buf = send_recv_proc(&ckp->generator, "getbase"); if (unlikely(!buf)) { LOGWARNING("Failed to get base from generator in update_base"); return; } if (unlikely(!strncasecmp(buf, "failed", 6))) { LOGWARNING("Generator returned failure in update_base"); return; } wb = ckzalloc(sizeof(workbase_t)); val = json_loads(buf, 0, NULL); dealloc(buf); json_strcpy(wb->target, val, "target"); json_dblcpy(&wb->diff, val, "diff"); json_uintcpy(&wb->version, val, "version"); json_uintcpy(&wb->curtime, val, "curtime"); json_strcpy(wb->prevhash, val, "prevhash"); json_strcpy(wb->ntime, val, "ntime"); sscanf(wb->ntime, "%x", &wb->ntime32); json_strcpy(wb->bbversion, val, "bbversion"); json_strcpy(wb->nbit, val, "nbit"); json_uint64cpy(&wb->coinbasevalue, val, "coinbasevalue"); json_intcpy(&wb->height, val, "height"); json_strdup(&wb->flags, val, "flags"); json_intcpy(&wb->transactions, val, "transactions"); if (wb->transactions) json_strdup(&wb->txn_data, val, "txn_data"); json_intcpy(&wb->merkles, val, "merkles"); wb->merkle_array = json_array(); if (wb->merkles) { json_t *arr; int i; arr = json_object_get(val, "merklehash"); for (i = 0; i < wb->merkles; i++) { strcpy(&wb->merklehash[i][0], json_string_value(json_array_get(arr, i))); hex2bin(&wb->merklebin[i][0], &wb->merklehash[i][0], 32); json_array_append(wb->merkle_array, json_string(&wb->merklehash[i][0])); } } json_decref(val); generate_coinbase(ckp, wb); wb->gentime = time(NULL); ck_wlock(&workbase_lock); wb->id = workbase_id++; if (strncmp(wb->prevhash, lasthash, 64)) { new_block = true; memcpy(lasthash, wb->prevhash, 65); blockchange_id = wb->id; } sprintf(wb->idstring, "%08x", wb->id); HASH_ITER(hh, workbases, tmp, tmpa) { /* Age old workbases older than 10 minutes old */ if (tmp->gentime < wb->gentime - 600) { HASH_DEL(workbases, tmp); clear_workbase(tmp); } } HASH_ADD_INT(workbases, id, wb); current_workbase = wb; ck_wunlock(&workbase_lock); stratum_broadcast_update(new_block); } /* Enter with instance_lock held */ static stratum_instance_t *__instance_by_id(int id) { stratum_instance_t *instance; HASH_FIND_INT(stratum_instances, &id, instance); return instance; } /* Enter with write instance_lock held */ static stratum_instance_t *__stratum_add_instance(int id) { stratum_instance_t *instance = ckzalloc(sizeof(stratum_instance_t)); uint64_t *u64; u64 = (uint64_t *)instance->enonce1bin; *u64 = htobe64(enonce1_64++); __bin2hex(instance->enonce1, instance->enonce1bin, 8); instance->id = id; instance->diff = instance->old_diff = 1; tv_time(&instance->ldc); LOGDEBUG("Added instance %d with enonce1 %s", id, instance->enonce1); HASH_ADD_INT(stratum_instances, id, instance); return instance; } static void stratum_add_recvd(json_t *val) { stratum_msg_t *msg; msg = ckzalloc(sizeof(stratum_msg_t)); msg->json_msg = val; mutex_lock(&stratum_recv_lock); LL_APPEND(stratum_recvs, msg); pthread_cond_signal(&stratum_recv_cond); mutex_unlock(&stratum_recv_lock); } /* For creating a list of sends without locking that can then be concatenated * to the stratum_sends list. Minimises locking and avoids taking recursive * locks. */ static void stratum_broadcast(json_t *val) { stratum_instance_t *instance, *tmp; stratum_msg_t *bulk_send = NULL; if (unlikely(!val)) { LOGERR("Sent null json to stratum_broadcast"); return; } ck_rlock(&instance_lock); HASH_ITER(hh, stratum_instances, instance, tmp) { stratum_msg_t *msg; if (!instance->authorised) continue; if (instance->disconnected) continue; msg = ckzalloc(sizeof(stratum_msg_t)); msg->json_msg = json_deep_copy(val); msg->client_id = instance->id; LL_APPEND(bulk_send, msg); } ck_runlock(&instance_lock); json_decref(val); if (!bulk_send) return; mutex_lock(&stratum_send_lock); if (stratum_sends) LL_CONCAT(stratum_sends, bulk_send); else stratum_sends = bulk_send; pthread_cond_signal(&stratum_send_cond); mutex_unlock(&stratum_send_lock); } static void stratum_add_send(json_t *val, int client_id) { stratum_msg_t *msg; msg = ckzalloc(sizeof(stratum_msg_t)); msg->json_msg = val; msg->client_id = client_id; mutex_lock(&stratum_send_lock); LL_APPEND(stratum_sends, msg); pthread_cond_signal(&stratum_send_cond); mutex_unlock(&stratum_send_lock); } static void drop_client(int client_id) { stratum_instance_t *client; ck_rlock(&instance_lock); client = __instance_by_id(client_id); ck_runlock(&instance_lock); /* May never have been a stratum instance */ if (unlikely(!client)) return; client->disconnected = true; } static int strat_loop(ckpool_t *ckp, proc_instance_t *pi) { int sockd, ret = 0, selret; unixsock_t *us = &pi->us; char *buf = NULL; fd_set readfds; tv_t timeout; reset: timeout.tv_sec = ckp->update_interval; retry: FD_ZERO(&readfds); FD_SET(us->sockd, &readfds); selret = select(us->sockd + 1, &readfds, NULL, NULL, &timeout); if (selret < 0) { if (interrupted()) goto retry; LOGERR("Select failed in strat_loop, killing stratifier!"); sleep(5); ret = 1; goto out; } if (!selret) { LOGDEBUG("%ds elapsed in strat_loop, updating gbt base", ckp->update_interval); update_base(ckp); goto reset; } sockd = accept(us->sockd, NULL, NULL); if (sockd < 0) { if (interrupted()) goto retry; LOGERR("Failed to accept on stratifier socket, retrying in 5s"); sleep(5); goto retry; } dealloc(buf); buf = recv_unix_msg(sockd); close(sockd); if (!buf) { LOGWARNING("Failed to get message in strat_loop"); goto retry; } LOGDEBUG("Stratifier received request: %s", buf); if (!strncasecmp(buf, "shutdown", 8)) goto out; else if (!strncasecmp(buf, "update", 6)) { update_base(ckp); goto reset; } else if (!strncasecmp(buf, "dropclient", 10)) { int client_id; ret = sscanf(buf, "dropclient=%d", &client_id); if (ret < 0) LOGDEBUG("Failed to parse dropclient command: %s", buf); else drop_client(client_id); goto retry; } else { json_t *val = json_loads(buf, 0, NULL); if (!val) { LOGDEBUG("Received unrecognised message: %s", buf); } else stratum_add_recvd(val); goto retry; } out: dealloc(buf); return ret; } static void *blockupdate(void *arg) { ckpool_t *ckp = (ckpool_t *)arg; char *buf = NULL, hash[68]; char request[8]; rename_proc("blockupdate"); buf = send_recv_proc(&ckp->generator, "getbest"); if (buf && strncasecmp(buf, "Failed", 6)) sprintf(request, "getbest"); else sprintf(request, "getlast"); memset(hash, 0, 68); while (42) { dealloc(buf); buf = send_recv_proc(&ckp->generator, request); if (buf && strcmp(buf, hash) && strncasecmp(buf, "Failed", 6)) { strcpy(hash, buf); LOGINFO("Detected hash change to %s", hash); send_proc(&ckp->stratifier, "update"); } else cksleep_ms(ckp->blockpoll); } return NULL; } static json_t *parse_subscribe(int client_id, json_t *params_val) { stratum_instance_t *client = NULL; char *enonce1; int arr_size; json_t *ret; int n2len; if (unlikely(!json_is_array(params_val))) return json_string("params not an array"); ck_rlock(&instance_lock); client = __instance_by_id(client_id); if (unlikely(!client)) { ck_runlock(&instance_lock); LOGERR("Failed to find client id %d in hashtable!", client_id); return NULL; } ck_runlock(&instance_lock); arr_size = json_array_size(params_val); if (arr_size > 0) { const char *buf; buf = json_string_value(json_array_get(params_val, 0)); if (buf && strlen(buf)) client->useragent = strdup(buf); if (arr_size > 1) { /* This would be the session id for reconnect */ buf = json_string_value(json_array_get(params_val, 1)); LOGDEBUG("Found old session id %s", buf); /* Add matching here */ } } enonce1 = strdup(client->enonce1); ck_rlock(&workbase_lock); if (likely(workbases)) n2len = workbases->enonce2varlen; else n2len = 8; ret = json_pack("[[[s,s]],s,i]", "mining.notify", enonce1, enonce1, n2len); ck_runlock(&workbase_lock); free(enonce1); return ret; } static int authorise_user(const char __maybe_unused *workername) { /* Talk to database here and return user_id or -1 if invalid */ return 1; } static json_t *parse_authorize(stratum_instance_t *client, json_t *params_val, json_t **err_val) { int arr_size, user_id; bool ret = false; const char *buf; if (unlikely(!json_is_array(params_val))) { *err_val = json_string("params not an array"); goto out; } arr_size = json_array_size(params_val); if (unlikely(arr_size < 1)) { *err_val = json_string("params missing array entries"); goto out; } buf = json_string_value(json_array_get(params_val, 0)); if (!buf) { *err_val = json_string("Invalid workername parameter"); goto out; } if (!strlen(buf)) { *err_val = json_string("Empty workername parameter"); goto out; } user_id = authorise_user(buf); if (user_id < 0) { *err_val = json_string("User not found"); goto out; } LOGINFO("Authorised user %s", buf); client->workername = strdup(buf); client->user_id = user_id; client->authorised = true; ret = true; out: return json_boolean(ret); } static void add_submit(stratum_instance_t *client, int diff) { int next_blockid, optimal, share_duration; double tdiff, drp, dsps, network_diff; json_t *json_msg; tv_t now_t; tv_time(&now_t); tdiff = tvdiff(&now_t, &client->last_share); copy_tv(&client->last_share, &now_t); client->ssdc++; decay_time(&client->dsps, diff, tdiff, 300); tdiff = tvdiff(&now_t, &client->ldc); /* Check the difficulty every 300 seconds or as many shares as we * should have had in that time, whichever comes first. */ if (client->ssdc < 100 && tdiff < 300) return; /* During the initial 5 minutes we work off the average shares per * second and thereafter from the rolling average */ share_duration = tvdiff(&now_t, &client->first_share); if (share_duration < 300) { if (unlikely(share_duration < 1)) return; dsps = client->diff_shares / share_duration; } else dsps = client->dsps; /* Diff rate product */ drp = dsps / (double)client->diff; /* Optimal rate product is 3.33, allow some hysteresis, clamping more * aggressively high share rates than low. */ if (drp > 3 && drp < 4) return; optimal = round(dsps * 3.33); if (optimal <= 1) { if (client->diff == 1) return; optimal = 1; } ck_rlock(&workbase_lock); next_blockid = workbase_id + 1; network_diff = current_workbase->diff; ck_runlock(&workbase_lock); if (optimal > network_diff) { /* Intentionall round down here */ optimal = network_diff; if (client->diff == optimal) return; } client->ssdc = 0; /* We have the effect of a change pending */ if (client->diff_change_job_id >= next_blockid) return; LOGDEBUG("Client %d dsps %.1f adjust diff to: %d ", client->id, dsps, optimal); copy_tv(&client->ldc, &now_t); client->diff_change_job_id = next_blockid; client->old_diff = client->diff; client->diff = optimal; json_msg = json_pack("{s[i]soss}", "params", client->diff, "id", json_null(), "method", "mining.set_difficulty"); stratum_add_send(json_msg, client->id); } /* FIXME Add logging of these as well */ static void add_submit_success(stratum_instance_t *client, int diff) { if (unlikely(!client->absolute_shares++)) tv_time(&client->first_share); client->diff_shares += diff; add_submit(client, diff); } static void add_submit_fail(stratum_instance_t *client, int diff) { add_submit(client, diff); } extern ckpool_t *global_ckp; /* We should already be holding the workbase_lock */ static void test_blocksolve(workbase_t *wb, const uchar *data, double diff, const char *coinbase, int cblen) { int transactions = wb->transactions + 1; char *gbt_block, varint[12]; char hexcoinbase[512]; /* Submit anything over 95% of the diff in case of rounding errors */ if (diff < current_workbase->diff * 0.95) return; gbt_block = ckalloc(512); sprintf(gbt_block, "submitblock:"); __bin2hex(gbt_block + 12, data, 80); if (transactions < 0xfd) { uint8_t val8 = transactions; __bin2hex(varint, (const unsigned char *)&val8, 1); } else if (transactions <= 0xffff) { uint16_t val16 = htole16(transactions); strcat(gbt_block, "fd"); __bin2hex(varint, (const unsigned char *)&val16, 2); } else { uint32_t val32 = htole32(transactions); strcat(gbt_block, "fe"); __bin2hex(varint, (const unsigned char *)&val32, 4); } strcat(gbt_block, varint); __bin2hex(hexcoinbase, coinbase, cblen); strcat(gbt_block, hexcoinbase); if (wb->transactions) realloc_strcat(&gbt_block, wb->txn_data); send_proc(&global_ckp->generator, gbt_block); free(gbt_block); } static double submission_diff(stratum_instance_t *client, workbase_t *wb, const char *nonce2, uint32_t ntime32, const char *nonce) { unsigned char merkle_root[32], merkle_sha[64]; char coinbase[256], data[80], share[68]; uchar swap[80], hash[32], hash1[32]; uint32_t *data32, *swap32, nonce32; int cblen = 0, i; double ret; memcpy(coinbase, wb->coinb1bin, wb->coinb1len); cblen += wb->coinb1len; memcpy(coinbase + cblen, client->enonce1bin, wb->enonce1varlen); cblen += wb->enonce1varlen; hex2bin(coinbase + cblen, nonce2, wb->enonce2varlen); cblen += wb->enonce2varlen; memcpy(coinbase + cblen, wb->coinb2bin, wb->coinb2len); cblen += wb->coinb2len; gen_hash((uchar *)coinbase, merkle_root, cblen); memcpy(merkle_sha, merkle_root, 32); for (i = 0; i < wb->merkles; i++) { memcpy(merkle_sha + 32, &wb->merklebin[i], 32); gen_hash(merkle_sha, merkle_root, 64); memcpy(merkle_sha, merkle_root, 32); } data32 = (uint32_t *)merkle_sha; swap32 = (uint32_t *)merkle_root; flip_32(swap32, data32); /* Copy the cached header binary and insert the merkle root */ memcpy(data, wb->headerbin, 80); memcpy(data + 36, merkle_root, 32); /* Insert the nonce value into the data */ sscanf(nonce, "%x", &nonce32); data32 = (uint32_t *)(data + 64 + 12); *data32 = htobe32(nonce32); /* Insert the ntime value into the data */ data32 = (uint32_t *)(data + 68); *data32 = htobe32(ntime32); /* Hash the share */ data32 = (uint32_t *)data; swap32 = (uint32_t *)swap; flip_80(swap32, data32); sha256(swap, 80, hash1); sha256(hash1, 32, hash); /* Calculate the diff of the share here */ ret = diff_from_target(hash); /* Test we haven't solved a block */ test_blocksolve(wb, swap, ret, coinbase, cblen); /* Generate hex string of hash for logging */ data32 = (uint32_t *)hash1; bswap_256(hash1, hash); __bin2hex(share, hash1, 32); LOGINFO("Client %d share diff %.1f : %s", client->id, ret, share); /* FIXME: Log share here */ return ret; } static json_t *parse_submit(stratum_instance_t *client, json_t *json_msg, json_t *params_val, json_t **err_val) { const char *user, *job_id, *nonce2, *ntime, *nonce; double sdiff = -1; uint32_t ntime32; bool ret = false; workbase_t *wb; int diff, id; if (unlikely(!json_is_array(params_val))) { *err_val = json_string("params not an array"); goto out; } if (unlikely(json_array_size(params_val) != 5)) { *err_val = json_string("Invalid array size"); goto out; } user = json_string_value(json_array_get(params_val, 0)); if (unlikely(!user || !strlen(user))) { *err_val = json_string("No username"); goto out; } job_id = json_string_value(json_array_get(params_val, 1)); if (unlikely(!job_id || !strlen(job_id))) { *err_val = json_string("No job_id"); goto out; } nonce2 = json_string_value(json_array_get(params_val, 2)); if (unlikely(!nonce2 || !strlen(nonce2))) { *err_val = json_string("No nonce2"); goto out; } ntime = json_string_value(json_array_get(params_val, 3)); if (unlikely(!ntime || !strlen(ntime))) { *err_val = json_string("No ntime"); goto out; } nonce = json_string_value(json_array_get(params_val, 4)); if (unlikely(!nonce || !strlen(nonce))) { *err_val = json_string("No nonce"); goto out; } if (strcmp(user, client->workername)) { *err_val = json_string("Worker mismatch"); goto out; } sscanf(job_id, "%x", &id); sscanf(ntime, "%x", &ntime32); ck_rlock(&workbase_lock); HASH_FIND_INT(workbases, &id, wb); if (unlikely(!wb)) { json_object_set_nocheck(json_msg, "reject-reason", json_string("Invalid JobID")); goto out_unlock; } if (id < blockchange_id) { json_object_set_nocheck(json_msg, "reject-reason", json_string("Stale")); goto out_unlock; } if ((int)strlen(nonce2) != wb->enonce2varlen * 2) { *err_val = json_string("Invalid nonce2 length"); goto out_unlock; } /* Ntime cannot be less, but allow forward ntime rolling up to max */ if (ntime32 < wb->ntime32 || ntime32 > wb->ntime32 + 7000) { json_object_set_nocheck(json_msg, "reject-reason", json_string("Ntime out of range")); goto out_unlock; } sdiff = submission_diff(client, wb, nonce2, ntime32, nonce); out_unlock: ck_runlock(&workbase_lock); /* Accept the lower of new and old diffs until the next update */ if (id < client->diff_change_job_id && client->old_diff < client->diff) diff = client->old_diff; else diff = client->diff; if (sdiff >= diff) { add_submit_success(client, diff); ret = true; } else { add_submit_fail(client, diff); if (sdiff >= 0) json_object_set_nocheck(json_msg, "reject-reason", json_string("Above target")); } out: return json_boolean(ret); } /* We should have already determined all the values passed to this are valid * by now. Set update if we should also send the latest stratum parameters */ static json_t *gen_json_result(int client_id, json_t *json_msg, json_t *method_val, json_t *params_val, json_t **err_val, bool *update) { stratum_instance_t *client = NULL; const char *method; json_t *ret = NULL; method = json_string_value(method_val); if (!strncasecmp(method, "mining.subscribe", 16)) { *update = true; ret = parse_subscribe(client_id, params_val); goto out; } ck_rlock(&instance_lock); client = __instance_by_id(client_id); if (unlikely(!client)) { ck_runlock(&instance_lock); LOGERR("Failed to find client id %d in hashtable!", client_id); goto out; } ck_runlock(&instance_lock); if (!strncasecmp(method, "mining.authorize", 16)) { ret = parse_authorize(client, params_val, err_val); goto out; } /* We should only accept authorised requests from here on */ if (!client->authorised) { ret = json_string("Unauthorised"); goto out; } if (!strncasecmp(method, "mining.submit", 13)) { ret = parse_submit(client, json_msg, params_val, err_val); goto out; } out: return ret; } /* Must enter with workbase_lock held */ static json_t *__stratum_notify(bool clean) { json_t *val; val = json_pack("{s:[ssssosssb],s:o,s:s}", "params", current_workbase->idstring, current_workbase->prevhash, current_workbase->coinb1, current_workbase->coinb2, json_copy(current_workbase->merkle_array), current_workbase->bbversion, current_workbase->nbit, current_workbase->ntime, clean, "id", json_null(), "method", "mining.notify"); return val; } static void stratum_broadcast_update(bool clean) { json_t *json_msg; ck_rlock(&workbase_lock); json_msg = __stratum_notify(clean); ck_runlock(&workbase_lock); stratum_broadcast(json_msg); } /* For sending a single stratum template update */ static void stratum_send_update(int client_id, bool clean) { json_t *json_msg; ck_rlock(&workbase_lock); json_msg = __stratum_notify(clean); ck_runlock(&workbase_lock); stratum_add_send(json_msg, client_id); } static void parse_instance_msg(int client_id, json_t *msg) { json_t *result_val = NULL, *err_val = NULL, *id_val = NULL; json_t *method, *params; bool update = false; json_t *json_msg; json_msg = json_object(); id_val = json_object_get(msg, "id"); if (unlikely(!id_val)) { err_val = json_string("-1:id not found"); goto out; } if (unlikely(!json_is_integer(id_val))) { err_val = json_string("-1:id is not integer"); goto out; } method = json_object_get(msg, "method"); if (unlikely(!method)) { err_val = json_string("-3:method not found"); goto out; } if (unlikely(!json_is_string(method))) { err_val = json_string("-1:method is not string"); goto out; } params = json_object_get(msg, "params"); if (unlikely(!params)) { err_val = json_string("-1:params not found"); goto out; } result_val = gen_json_result(client_id, json_msg, method, params, &err_val, &update); if (!err_val) err_val = json_null(); out: json_object_set_nocheck(json_msg, "id", id_val); json_object_set_nocheck(json_msg, "error", err_val); json_object_set_nocheck(json_msg, "result", result_val); stratum_add_send(json_msg, client_id); if (update) stratum_send_update(client_id, true); } static void *stratum_receiver(void *arg) { ckpool_t __maybe_unused *ckp = (ckpool_t *)arg; stratum_msg_t *msg; rename_proc("receiver"); while (42) { stratum_instance_t *instance; /* Pop the head off the list if it exists or wait for a conditional * signal telling us there is work */ mutex_lock(&stratum_recv_lock); if (!stratum_recvs) pthread_cond_wait(&stratum_recv_cond, &stratum_recv_lock); msg = stratum_recvs; if (likely(msg)) LL_DELETE(stratum_recvs, msg); mutex_unlock(&stratum_recv_lock); if (unlikely(!msg)) continue; msg->client_id = json_integer_value(json_object_get(msg->json_msg, "client_id")); json_object_del(msg->json_msg, "client_id"); /* Parse the message here */ ck_ilock(&instance_lock); instance = __instance_by_id(msg->client_id); if (!instance) { /* client_id instance doesn't exist yet, create one */ ck_ulock(&instance_lock); instance = __stratum_add_instance(msg->client_id); ck_dwilock(&instance_lock); } ck_uilock(&instance_lock); parse_instance_msg(msg->client_id, msg->json_msg); json_decref(msg->json_msg); free(msg); } return NULL; } static void *stratum_sender(void *arg) { ckpool_t *ckp = (ckpool_t *)arg; rename_proc("sender"); while (42) { stratum_msg_t *msg; char *s; mutex_lock(&stratum_send_lock); if (!stratum_sends) pthread_cond_wait(&stratum_send_cond, &stratum_send_lock); msg = stratum_sends; if (likely(msg)) LL_DELETE(stratum_sends, msg); mutex_unlock(&stratum_send_lock); if (unlikely(!msg)) continue; if (unlikely(!msg->json_msg)) { LOGERR("Sent null json msg to stratum_sender"); free(msg); continue; } /* Add client_id to the json message and send it to the * connector process to be delivered */ json_object_set_new_nocheck(msg->json_msg, "client_id", json_integer(msg->client_id)); s = json_dumps(msg->json_msg, 0); send_proc(&ckp->connector, s); free(s); json_decref(msg->json_msg); free(msg); } return NULL; } int stratifier(proc_instance_t *pi) { pthread_t pth_blockupdate, pth_stratum_receiver, pth_stratum_sender; ckpool_t *ckp = pi->ckp; int ret = 0; /* Store this for use elsewhere */ hex2bin(scriptsig_header_bin, scriptsig_header, 41); address_to_pubkeytxn(pubkeytxnbin, ckp->btcaddress); __bin2hex(pubkeytxn, pubkeytxnbin, 25); /* Set the initial id to time to not send the same id on restarts */ blockchange_id = workbase_id = time(NULL); cklock_init(&instance_lock); mutex_init(&stratum_recv_lock); cond_init(&stratum_recv_cond); create_pthread(&pth_stratum_receiver, stratum_receiver, ckp); mutex_init(&stratum_send_lock); cond_init(&stratum_send_cond); create_pthread(&pth_stratum_sender, stratum_sender, ckp); cklock_init(&workbase_lock); create_pthread(&pth_blockupdate, blockupdate, ckp); strat_loop(ckp, pi); return ret; }