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util.c
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/*
* Copyright 2010 Jeff Garzik
* Copyright 2012 Luke Dashjr
* Copyright 2012-2020 pooler
* Copyright 2017 Pieter Wuille
*
* 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 2 of the License, or (at your option)
* any later version. See COPYING for more details.
*/
#define _GNU_SOURCE
#include "cpuminer-config.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdarg.h>
#include <string.h>
#include <stdbool.h>
#include <inttypes.h>
#include <limits.h>
#include <errno.h>
#include <unistd.h>
#include <jansson.h>
#include <curl/curl.h>
#include <time.h>
#if defined(WIN32)
#include <winsock2.h>
#include <mstcpip.h>
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#endif
#include "compat.h"
#include "miner.h"
#include "elist.h"
struct header_info {
char *lp_path;
char *reason;
char *stratum_url;
size_t content_length;
};
struct data_buffer {
void *buf;
size_t len;
size_t allocated;
struct header_info *headers;
};
struct tq_ent {
void *data;
struct list_head q_node;
};
struct thread_q {
struct list_head q;
bool frozen;
pthread_mutex_t mutex;
pthread_cond_t cond;
};
void applog(int prio, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
#ifdef HAVE_SYSLOG_H
if (use_syslog) {
va_list ap2;
char *buf;
int len;
va_copy(ap2, ap);
len = vsnprintf(NULL, 0, fmt, ap2) + 1;
va_end(ap2);
buf = alloca(len);
if (vsnprintf(buf, len, fmt, ap) >= 0)
syslog(prio, "%s", buf);
}
#else
if (0) {}
#endif
else {
char *f;
int len;
time_t now;
struct tm tm, *tm_p;
struct timeval tv;
struct timezone tz;
gettimeofday(&tv, &tz);
now = tv.tv_sec;
pthread_mutex_lock(&applog_lock);
tm_p = gmtime(&now);
memcpy(&tm, tm_p, sizeof(tm));
pthread_mutex_unlock(&applog_lock);
len = 50 + strlen(fmt) + 2; // Increased length to accommodate microseconds
f = alloca(len);
sprintf(f, "%d-%02d-%02dT%02d:%02d:%02d.%06ldZ %s\n",
tm.tm_year + 1900,
tm.tm_mon + 1,
tm.tm_mday,
tm.tm_hour,
tm.tm_min,
tm.tm_sec,
tv.tv_usec, // Print microseconds
fmt);
pthread_mutex_lock(&applog_lock);
vfprintf(stderr, f, ap); /* atomic write to stderr */
fflush(stderr);
pthread_mutex_unlock(&applog_lock);
}
va_end(ap);
}
/* Modify the representation of integer numbers which would cause an overflow
* so that they are treated as floating-point numbers.
* This is a hack to overcome the limitations of some versions of Jansson. */
static char *hack_json_numbers(const char *in)
{
char *out;
int i, off, intoff;
bool in_str, in_int;
out = calloc(2 * strlen(in) + 1, 1);
if (!out)
return NULL;
off = intoff = 0;
in_str = in_int = false;
for (i = 0; in[i]; i++) {
char c = in[i];
if (c == '"') {
in_str = !in_str;
} else if (c == '\\') {
out[off++] = c;
if (!in[++i])
break;
} else if (!in_str && !in_int && isdigit(c)) {
intoff = off;
in_int = true;
} else if (in_int && !isdigit(c)) {
if (c != '.' && c != 'e' && c != 'E' && c != '+' && c != '-') {
in_int = false;
if (off - intoff > 4) {
char *end;
#if JSON_INTEGER_IS_LONG_LONG
errno = 0;
strtoll(out + intoff, &end, 10);
if (!*end && errno == ERANGE) {
#else
long l;
errno = 0;
l = strtol(out + intoff, &end, 10);
if (!*end && (errno == ERANGE || l > INT_MAX)) {
#endif
out[off++] = '.';
out[off++] = '0';
}
}
}
}
out[off++] = in[i];
}
return out;
}
static void databuf_free(struct data_buffer *db)
{
if (!db)
return;
free(db->buf);
memset(db, 0, sizeof(*db));
}
static size_t all_data_cb(const void *ptr, size_t size, size_t nmemb,
void *user_data)
{
struct data_buffer *db = user_data;
size_t len = size * nmemb;
size_t newalloc, reqalloc;
void *newmem;
static const unsigned char zero = 0;
static const size_t max_realloc_increase = 8 * 1024 * 1024;
static const size_t initial_alloc = 16 * 1024;
/* minimum required allocation size */
reqalloc = db->len + len + 1;
if (reqalloc > db->allocated) {
if (db->len > 0) {
newalloc = db->allocated * 2;
} else {
if (db->headers->content_length > 0)
newalloc = db->headers->content_length + 1;
else
newalloc = initial_alloc;
}
if (db->headers->content_length == 0) {
/* limit the maximum buffer increase */
if (newalloc - db->allocated > max_realloc_increase)
newalloc = db->allocated + max_realloc_increase;
}
/* ensure we have a big enough allocation */
if (reqalloc > newalloc)
newalloc = reqalloc;
newmem = realloc(db->buf, newalloc);
if (!newmem)
return 0;
db->buf = newmem;
db->allocated = newalloc;
}
memcpy(db->buf + db->len, ptr, len); /* append new data */
memcpy(db->buf + db->len + len, &zero, 1); /* null terminate */
db->len += len;
return len;
}
static size_t resp_hdr_cb(void *ptr, size_t size, size_t nmemb, void *user_data)
{
struct header_info *hi = user_data;
size_t remlen, slen, ptrlen = size * nmemb;
char *rem, *val = NULL, *key = NULL;
void *tmp;
val = calloc(1, ptrlen);
key = calloc(1, ptrlen);
if (!key || !val)
goto out;
tmp = memchr(ptr, ':', ptrlen);
if (!tmp || (tmp == ptr)) /* skip empty keys / blanks */
goto out;
slen = tmp - ptr;
if ((slen + 1) == ptrlen) /* skip key w/ no value */
goto out;
memcpy(key, ptr, slen); /* store & nul term key */
key[slen] = 0;
rem = ptr + slen + 1; /* trim value's leading whitespace */
remlen = ptrlen - slen - 1;
while ((remlen > 0) && (isspace(*rem))) {
remlen--;
rem++;
}
memcpy(val, rem, remlen); /* store value, trim trailing ws */
val[remlen] = 0;
while ((*val) && (isspace(val[strlen(val) - 1]))) {
val[strlen(val) - 1] = 0;
}
if (!*val) /* skip blank value */
goto out;
if (!strcasecmp("X-Long-Polling", key)) {
hi->lp_path = val; /* steal memory reference */
val = NULL;
}
if (!strcasecmp("X-Reject-Reason", key)) {
hi->reason = val; /* steal memory reference */
val = NULL;
}
if (!strcasecmp("X-Stratum", key)) {
hi->stratum_url = val; /* steal memory reference */
val = NULL;
}
if (!strcasecmp("Content-Length", key))
hi->content_length = strtoul(val, NULL, 10);
out:
free(key);
free(val);
return ptrlen;
}
#if LIBCURL_VERSION_NUM >= 0x070f06
static int sockopt_keepalive_cb(void *userdata, curl_socket_t fd,
curlsocktype purpose)
{
int keepalive = 1;
int tcp_keepcnt = 3;
int tcp_keepidle = 50;
int tcp_keepintvl = 50;
#ifndef WIN32
if (unlikely(setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &keepalive,
sizeof(keepalive))))
return 1;
#ifdef __linux
if (unlikely(setsockopt(fd, SOL_TCP, TCP_KEEPCNT,
&tcp_keepcnt, sizeof(tcp_keepcnt))))
return 1;
if (unlikely(setsockopt(fd, SOL_TCP, TCP_KEEPIDLE,
&tcp_keepidle, sizeof(tcp_keepidle))))
return 1;
if (unlikely(setsockopt(fd, SOL_TCP, TCP_KEEPINTVL,
&tcp_keepintvl, sizeof(tcp_keepintvl))))
return 1;
#endif /* __linux */
#ifdef __APPLE_CC__
if (unlikely(setsockopt(fd, IPPROTO_TCP, TCP_KEEPALIVE,
&tcp_keepintvl, sizeof(tcp_keepintvl))))
return 1;
#endif /* __APPLE_CC__ */
#else /* WIN32 */
struct tcp_keepalive vals;
vals.onoff = 1;
vals.keepalivetime = tcp_keepidle * 1000;
vals.keepaliveinterval = tcp_keepintvl * 1000;
DWORD outputBytes;
if (unlikely(WSAIoctl(fd, SIO_KEEPALIVE_VALS, &vals, sizeof(vals),
NULL, 0, &outputBytes, NULL, NULL)))
return 1;
#endif /* WIN32 */
return 0;
}
#endif
json_t *json_rpc_call(CURL *curl, const char *url,
const char *userpass, const char *rpc_req,
int *curl_err, int flags)
{
json_t *val, *err_val, *res_val;
int rc;
long http_rc;
struct data_buffer all_data = {0};
char *json_buf;
json_error_t err;
struct curl_slist *headers = NULL;
char curl_err_str[CURL_ERROR_SIZE];
long timeout = (flags & JSON_RPC_LONGPOLL) ? opt_timeout : 30;
struct header_info hi = {0};
all_data.headers = &hi;
/* it is assumed that 'curl' is freshly [re]initialized at this pt */
if (opt_protocol)
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
curl_easy_setopt(curl, CURLOPT_URL, url);
if (opt_cert)
curl_easy_setopt(curl, CURLOPT_CAINFO, opt_cert);
curl_easy_setopt(curl, CURLOPT_ENCODING, "");
curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
curl_easy_setopt(curl, CURLOPT_TCP_NODELAY, 1);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, all_data_cb);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &all_data);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_err_str);
if (opt_redirect)
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, timeout);
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, resp_hdr_cb);
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &hi);
if (opt_proxy) {
curl_easy_setopt(curl, CURLOPT_PROXY, opt_proxy);
curl_easy_setopt(curl, CURLOPT_PROXYTYPE, opt_proxy_type);
}
if (userpass) {
curl_easy_setopt(curl, CURLOPT_USERPWD, userpass);
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
}
#if LIBCURL_VERSION_NUM >= 0x070f06
if (flags & JSON_RPC_LONGPOLL)
curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_keepalive_cb);
#endif
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, rpc_req);
if (opt_protocol)
applog(LOG_DEBUG, "JSON protocol request:\n%s\n", rpc_req);
headers = curl_slist_append(headers, "Content-Type: application/json");
headers = curl_slist_append(headers, "User-Agent: " USER_AGENT);
headers = curl_slist_append(headers, "X-Mining-Extensions: midstate");
headers = curl_slist_append(headers, "Accept:"); /* disable Accept hdr*/
headers = curl_slist_append(headers, "Expect:"); /* disable Expect hdr*/
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
rc = curl_easy_perform(curl);
if (curl_err != NULL)
*curl_err = rc;
if (rc) {
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_rc);
if (!((flags & JSON_RPC_LONGPOLL) && rc == CURLE_OPERATION_TIMEDOUT) &&
!((flags & JSON_RPC_QUIET_404) && http_rc == 404))
applog(LOG_ERR, "HTTP request failed: %s", curl_err_str);
if (curl_err && (flags & JSON_RPC_QUIET_404) && http_rc == 404)
*curl_err = CURLE_OK;
goto err_out;
}
/* If X-Stratum was found, activate Stratum */
if (want_stratum && hi.stratum_url &&
!strncasecmp(hi.stratum_url, "stratum+tcp://", 14)) {
have_stratum = true;
tq_push(thr_info[stratum_thr_id].q, hi.stratum_url);
hi.stratum_url = NULL;
}
/* If X-Long-Polling was found, activate long polling */
if (!have_longpoll && want_longpoll && hi.lp_path && !have_gbt &&
allow_getwork && !have_stratum) {
have_longpoll = true;
tq_push(thr_info[longpoll_thr_id].q, hi.lp_path);
hi.lp_path = NULL;
}
if (!all_data.buf) {
applog(LOG_ERR, "Empty data received in json_rpc_call.");
goto err_out;
}
json_buf = hack_json_numbers(all_data.buf);
errno = 0; /* needed for Jansson < 2.1 */
val = JSON_LOADS(json_buf, &err);
free(json_buf);
if (!val) {
applog(LOG_ERR, "JSON decode failed(%d): %s", err.line, err.text);
goto err_out;
}
if (opt_protocol) {
char *s = json_dumps(val, JSON_INDENT(3));
applog(LOG_DEBUG, "JSON protocol response:\n%s", s);
free(s);
}
/* JSON-RPC valid response returns a 'result' and a null 'error'. */
res_val = json_object_get(val, "result");
err_val = json_object_get(val, "error");
if (!res_val || (err_val && !json_is_null(err_val))) {
char *s;
if (err_val)
s = json_dumps(err_val, JSON_INDENT(3));
else
s = strdup("(unknown reason)");
applog(LOG_ERR, "JSON-RPC call failed: %s", s);
free(s);
goto err_out;
}
if (hi.reason)
json_object_set_new(val, "reject-reason", json_string(hi.reason));
databuf_free(&all_data);
curl_slist_free_all(headers);
curl_easy_reset(curl);
return val;
err_out:
free(hi.lp_path);
free(hi.reason);
free(hi.stratum_url);
databuf_free(&all_data);
curl_slist_free_all(headers);
curl_easy_reset(curl);
return NULL;
}
void memrev(unsigned char *p, size_t len)
{
unsigned char c, *q;
for (q = p + len - 1; p < q; p++, q--) {
c = *p;
*p = *q;
*q = c;
}
}
void bin2hex(char *s, const unsigned char *p, size_t len)
{
int i;
for (i = 0; i < len; i++)
sprintf(s + (i * 2), "%02x", (unsigned int) p[i]);
}
char *abin2hex(const unsigned char *p, size_t len)
{
char *s = malloc((len * 2) + 1);
if (!s)
return NULL;
bin2hex(s, p, len);
return s;
}
bool hex2bin(unsigned char *p, const char *hexstr, size_t len)
{
if(hexstr == NULL)
return false;
size_t hexstr_len = strlen(hexstr);
if((hexstr_len % 2) != 0) {
applog(LOG_ERR, "hex2bin str truncated");
return false;
}
size_t bin_len = hexstr_len / 2;
if (bin_len > len) {
applog(LOG_ERR, "hex2bin buffer too small");
return false;
}
memset(p, 0, len);
size_t i = 0;
while (i < hexstr_len) {
char c = hexstr[i];
unsigned char nibble;
if(c >= '0' && c <= '9') {
nibble = (c - '0');
} else if (c >= 'A' && c <= 'F') {
nibble = (10 + (c - 'A'));
} else if (c >= 'a' && c <= 'f') {
nibble = (10 + (c - 'a'));
} else {
applog(LOG_ERR, "hex2bin invalid hex");
return false;
}
p[(i / 2)] |= (nibble << ((1 - (i % 2)) * 4));
i++;
}
return true;
}
int varint_encode(unsigned char *p, uint64_t n)
{
int i;
if (n < 0xfd) {
p[0] = n;
return 1;
}
if (n <= 0xffff) {
p[0] = 0xfd;
p[1] = n & 0xff;
p[2] = n >> 8;
return 3;
}
if (n <= 0xffffffff) {
p[0] = 0xfe;
for (i = 1; i < 5; i++) {
p[i] = n & 0xff;
n >>= 8;
}
return 5;
}
p[0] = 0xff;
for (i = 1; i < 9; i++) {
p[i] = n & 0xff;
n >>= 8;
}
return 9;
}
static const char b58digits[] = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
static bool b58dec(unsigned char *bin, size_t binsz, const char *b58)
{
size_t i, j;
uint64_t t;
uint32_t c;
uint32_t *outi;
size_t outisz = (binsz + 3) / 4;
int rem = binsz % 4;
uint32_t remmask = 0xffffffff << (8 * rem);
size_t b58sz = strlen(b58);
bool rc = false;
outi = calloc(outisz, sizeof(*outi));
for (i = 0; i < b58sz; ++i) {
for (c = 0; b58digits[c] != b58[i]; c++)
if (!b58digits[c])
goto out;
for (j = outisz; j--; ) {
t = (uint64_t)outi[j] * 58 + c;
c = t >> 32;
outi[j] = t & 0xffffffff;
}
if (c || outi[0] & remmask)
goto out;
}
j = 0;
switch (rem) {
case 3:
*(bin++) = (outi[0] >> 16) & 0xff;
case 2:
*(bin++) = (outi[0] >> 8) & 0xff;
case 1:
*(bin++) = outi[0] & 0xff;
++j;
default:
break;
}
for (; j < outisz; ++j) {
be32enc((uint32_t *)bin, outi[j]);
bin += sizeof(uint32_t);
}
rc = true;
out:
free(outi);
return rc;
}
static int b58check(unsigned char *bin, size_t binsz, const char *b58)
{
unsigned char buf[32];
int i;
sha256d(buf, bin, binsz - 4);
if (memcmp(&bin[binsz - 4], buf, 4))
return -1;
/* Check number of zeros is correct AFTER verifying checksum
* (to avoid possibility of accessing the string beyond the end) */
for (i = 0; bin[i] == '\0' && b58[i] == '1'; ++i);
if (bin[i] == '\0' || b58[i] == '1')
return -3;
return bin[0];
}
static uint32_t bech32_polymod_step(uint32_t pre) {
uint8_t b = pre >> 25;
return ((pre & 0x1FFFFFF) << 5) ^
(-((b >> 0) & 1) & 0x3b6a57b2UL) ^
(-((b >> 1) & 1) & 0x26508e6dUL) ^
(-((b >> 2) & 1) & 0x1ea119faUL) ^
(-((b >> 3) & 1) & 0x3d4233ddUL) ^
(-((b >> 4) & 1) & 0x2a1462b3UL);
}
static const int8_t bech32_charset_rev[128] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
15, -1, 10, 17, 21, 20, 26, 30, 7, 5, -1, -1, -1, -1, -1, -1,
-1, 29, -1, 24, 13, 25, 9, 8, 23, -1, 18, 22, 31, 27, 19, -1,
1, 0, 3, 16, 11, 28, 12, 14, 6, 4, 2, -1, -1, -1, -1, -1,
-1, 29, -1, 24, 13, 25, 9, 8, 23, -1, 18, 22, 31, 27, 19, -1,
1, 0, 3, 16, 11, 28, 12, 14, 6, 4, 2, -1, -1, -1, -1, -1
};
static bool bech32_decode(char *hrp, uint8_t *data, size_t *data_len, const char *input) {
uint32_t chk = 1;
size_t i;
size_t input_len = strlen(input);
size_t hrp_len;
int have_lower = 0, have_upper = 0;
if (input_len < 8 || input_len > 90) {
return false;
}
*data_len = 0;
while (*data_len < input_len && input[(input_len - 1) - *data_len] != '1') {
++(*data_len);
}
hrp_len = input_len - (1 + *data_len);
if (1 + *data_len >= input_len || *data_len < 6) {
return false;
}
*(data_len) -= 6;
for (i = 0; i < hrp_len; ++i) {
int ch = input[i];
if (ch < 33 || ch > 126) {
return false;
}
if (ch >= 'a' && ch <= 'z') {
have_lower = 1;
} else if (ch >= 'A' && ch <= 'Z') {
have_upper = 1;
ch = (ch - 'A') + 'a';
}
hrp[i] = ch;
chk = bech32_polymod_step(chk) ^ (ch >> 5);
}
hrp[i] = 0;
chk = bech32_polymod_step(chk);
for (i = 0; i < hrp_len; ++i) {
chk = bech32_polymod_step(chk) ^ (input[i] & 0x1f);
}
++i;
while (i < input_len) {
int v = (input[i] & 0x80) ? -1 : bech32_charset_rev[(int)input[i]];
if (input[i] >= 'a' && input[i] <= 'z') have_lower = 1;
if (input[i] >= 'A' && input[i] <= 'Z') have_upper = 1;
if (v == -1) {
return false;
}
chk = bech32_polymod_step(chk) ^ v;
if (i + 6 < input_len) {
data[i - (1 + hrp_len)] = v;
}
++i;
}
if (have_lower && have_upper) {
return false;
}
return chk == 1;
}
static bool convert_bits(uint8_t *out, size_t *outlen, int outbits, const uint8_t *in, size_t inlen, int inbits, int pad) {
uint32_t val = 0;
int bits = 0;
uint32_t maxv = (((uint32_t)1) << outbits) - 1;
while (inlen--) {
val = (val << inbits) | *(in++);
bits += inbits;
while (bits >= outbits) {
bits -= outbits;
out[(*outlen)++] = (val >> bits) & maxv;
}
}
if (pad) {
if (bits) {
out[(*outlen)++] = (val << (outbits - bits)) & maxv;
}
} else if (((val << (outbits - bits)) & maxv) || bits >= inbits) {
return false;
}
return true;
}
static bool segwit_addr_decode(int *witver, uint8_t *witdata, size_t *witdata_len, const char *addr) {
uint8_t data[84];
char hrp_actual[84];
size_t data_len;
if (!bech32_decode(hrp_actual, data, &data_len, addr)) return false;
if (data_len == 0 || data_len > 65) return false;
if (data[0] > 16) return false;
*witdata_len = 0;
if (!convert_bits(witdata, witdata_len, 8, data + 1, data_len - 1, 5, 0)) return false;
if (*witdata_len < 2 || *witdata_len > 40) return false;
if (data[0] == 0 && *witdata_len != 20 && *witdata_len != 32) return false;
*witver = data[0];
return true;
}
static size_t bech32_to_script(uint8_t *out, size_t outsz, const char *addr) {
uint8_t witprog[40];
size_t witprog_len;
int witver;
if (!segwit_addr_decode(&witver, witprog, &witprog_len, addr))
return 0;
if (outsz < witprog_len + 2)
return 0;
out[0] = witver ? (0x50 + witver) : 0;
out[1] = witprog_len;
memcpy(out + 2, witprog, witprog_len);
return witprog_len + 2;
}
size_t address_to_script(unsigned char *out, size_t outsz, const char *addr)
{
unsigned char addrbin[25];
int addrver;
size_t rv;
if (!b58dec(addrbin, sizeof(addrbin), addr))
return bech32_to_script(out, outsz, addr);
addrver = b58check(addrbin, sizeof(addrbin), addr);
if (addrver < 0)
return 0;
switch (addrver) {
case 5: /* Bitcoin script hash */
case 196: /* Testnet script hash */
if (outsz < (rv = 23))
return rv;
out[ 0] = 0xa9; /* OP_HASH160 */
out[ 1] = 0x14; /* push 20 bytes */
memcpy(&out[2], &addrbin[1], 20);
out[22] = 0x87; /* OP_EQUAL */
return rv;
default:
if (outsz < (rv = 25))
return rv;
out[ 0] = 0x76; /* OP_DUP */
out[ 1] = 0xa9; /* OP_HASH160 */
out[ 2] = 0x14; /* push 20 bytes */
memcpy(&out[3], &addrbin[1], 20);
out[23] = 0x88; /* OP_EQUALVERIFY */
out[24] = 0xac; /* OP_CHECKSIG */
return rv;
}
}
/* Subtract the `struct timeval' values X and Y,
storing the result in RESULT.
Return 1 if the difference is negative, otherwise 0. */
int timeval_subtract(struct timeval *result, struct timeval *x,
struct timeval *y)
{
/* Perform the carry for the later subtraction by updating Y. */
if (x->tv_usec < y->tv_usec) {
int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
y->tv_usec -= 1000000 * nsec;
y->tv_sec += nsec;
}
if (x->tv_usec - y->tv_usec > 1000000) {
int nsec = (x->tv_usec - y->tv_usec) / 1000000;
y->tv_usec += 1000000 * nsec;
y->tv_sec -= nsec;
}
/* Compute the time remaining to wait.
* `tv_usec' is certainly positive. */
result->tv_sec = x->tv_sec - y->tv_sec;
result->tv_usec = x->tv_usec - y->tv_usec;
/* Return 1 if result is negative. */
return x->tv_sec < y->tv_sec;
}
bool fulltest(const uint32_t *hash, const uint32_t *target)
{
int i;
bool rc = true;
for (i = 7; i >= 0; i--) {
if (hash[i] > target[i]) {
rc = false;
break;
}
if (hash[i] < target[i]) {
rc = true;
break;
}
}
if (opt_debug) {
uint32_t hash_be[8], target_be[8];
char hash_str[65], target_str[65];
for (i = 0; i < 8; i++) {
be32enc(hash_be + i, hash[7 - i]);
be32enc(target_be + i, target[7 - i]);
}
bin2hex(hash_str, (unsigned char *)hash_be, 32);
bin2hex(target_str, (unsigned char *)target_be, 32);
applog(LOG_DEBUG, "DEBUG: %s\nHash: %s\nTarget: %s",
rc ? "hash <= target"
: "hash > target (false positive)",
hash_str,
target_str);
}
return rc;
}
void diff_to_target(uint32_t *target, double diff)
{
uint64_t m;
int k;
for (k = 6; k > 0 && diff > 1.0; k--)
diff /= 4294967296.0;
m = 4294901760.0 / diff;
if (m == 0 && k == 6)
memset(target, 0xff, 32);
else {
memset(target, 0, 32);
target[k] = (uint32_t)m;
target[k + 1] = (uint32_t)(m >> 32);
}
}
#ifdef WIN32
#define socket_blocks() (WSAGetLastError() == WSAEWOULDBLOCK)
#else
#define socket_blocks() (errno == EAGAIN || errno == EWOULDBLOCK)
#endif
static bool send_line(struct stratum_ctx *sctx, char *s)
{
ssize_t len, sent = 0;
len = strlen(s);
s[len++] = '\n';
while (len > 0) {
struct timeval timeout = {0, 0};
ssize_t n;
fd_set wd;
FD_ZERO(&wd);
FD_SET(sctx->sock, &wd);
if (select(sctx->sock + 1, NULL, &wd, NULL, &timeout) < 1)
return false;
#if LIBCURL_VERSION_NUM >= 0x071202
CURLcode rc = curl_easy_send(sctx->curl, s + sent, len, (size_t *)&n);
if (rc != CURLE_OK) {
if (rc != CURLE_AGAIN)
#else
n = send(sctx->sock, s + sent, len, 0);
if (n < 0) {
if (!socket_blocks())
#endif
return false;
n = 0;
}
sent += n;
len -= n;
}
return true;
}
bool stratum_send_line(struct stratum_ctx *sctx, char *s)
{
bool ret = false;
if (opt_protocol)
applog(LOG_DEBUG, "> %s", s);
pthread_mutex_lock(&sctx->sock_lock);
ret = send_line(sctx, s);
pthread_mutex_unlock(&sctx->sock_lock);
return ret;
}
static bool socket_full(curl_socket_t sock, int timeout)
{
struct timeval tv;
fd_set rd;
FD_ZERO(&rd);
FD_SET(sock, &rd);
tv.tv_sec = timeout;
tv.tv_usec = 0;
if (select(sock + 1, &rd, NULL, NULL, &tv) > 0)
return true;
return false;
}
bool stratum_socket_full(struct stratum_ctx *sctx, int timeout)
{
return strlen(sctx->sockbuf) || socket_full(sctx->sock, timeout);
}
#define RBUFSIZE 2048
#define RECVSIZE (RBUFSIZE - 4)
static void stratum_buffer_append(struct stratum_ctx *sctx, const char *s)
{
size_t old, new;
old = strlen(sctx->sockbuf);
new = old + strlen(s) + 1;
if (new >= sctx->sockbuf_size) {
sctx->sockbuf_size = new + (RBUFSIZE - (new % RBUFSIZE));
sctx->sockbuf = realloc(sctx->sockbuf, sctx->sockbuf_size);
}
strcpy(sctx->sockbuf + old, s);
}
char *stratum_recv_line(struct stratum_ctx *sctx)
{
ssize_t len, buflen;
char *tok, *sret = NULL;
if (!strstr(sctx->sockbuf, "\n")) {
bool ret = true;
time_t rstart;
time(&rstart);
if (!socket_full(sctx->sock, 60)) {
applog(LOG_ERR, "stratum_recv_line timed out");
goto out;
}