added --rand-nonce option to try random instead of sequentially increasing nonces

src/Options.cpp

@@ -79,6 +79,7 @@ Options:\n\
       --print-time=N    print hashrate report every N seconds\n\
   -h, --help            display this help and exit\n\
   -V, --version         output version information and exit\n\
+      --rand-nonce      generate random nonces instead of monotonically increasing ones\n\
 ";
 
 
@@ -109,6 +110,7 @@ static struct option const options[] = {
     { "user",          1, nullptr, 'u'  },
     { "userpass",      1, nullptr, 'O'  },
     { "version",       0, nullptr, 'V'  },
+    { "rand-nonce",    0, nullptr, 1008 },
     { 0, 0, 0, 0 }
 };
 
@@ -366,6 +368,10 @@ bool Options::parseArg(int key, char *arg)
         m_printTime = v;
         break;
 
+    case 1008: /* --rand-nonce */
+        m_pools.back()->setRandNonce(true);
+        break;
+
     default:
         showUsage(1);
         return false;

src/net/Client.cpp

@@ -186,7 +186,7 @@ bool Client::parseJob(const json_t *params, int *code)
         return false;
     }
 
-    Job job(m_id, m_url.isNicehash());
+    Job job(m_id, m_url.isNicehash(), m_url.isRandNonce());
     if (!job.setId(json_string_value(json_object_get(params, "job_id")))) {
         *code = 3;
         return false;

src/net/Job.cpp

@@ -56,8 +56,9 @@ static inline char hf_bin2hex(unsigned char c)
 }
 
 
-Job::Job(int poolId, bool nicehash) :
+Job::Job(int poolId, bool nicehash, bool randnonce) :
     m_nicehash(nicehash),
+    m_randnonce(randnonce),
     m_poolId(poolId),
     m_size(0),
     m_diff(0),

src/net/Job.h

@@ -27,19 +27,19 @@
 
 #include <stdint.h>
 
-
 #include "align.h"
 
 
 class Job
 {
 public:
-    Job(int poolId = -2, bool nicehash = false);
+    Job(int poolId = -2, bool nicehash = false, bool randnonce = false);
     bool setBlob(const char *blob);
     bool setId(const char *id);
     bool setTarget(const char *target);
 
     inline bool isNicehash() const         { return m_nicehash; }
+    inline bool isRandNonce() const        { return m_randnonce; }
     inline bool isValid() const            { return m_size > 0 && m_diff > 0; }
     inline const char *id() const          { return m_id; }
     inline const uint8_t *blob() const     { return m_blob; }
@@ -49,6 +49,7 @@ public:
     inline uint32_t size() const           { return m_size; }
     inline uint64_t target() const         { return m_target; }
     inline void setNicehash(bool nicehash) { m_nicehash = nicehash; }
+    inline void setRandNonce(bool randnonce) { m_randnonce = randnonce; }
 
 #   ifdef XMRIG_PROXY_PROJECT
     inline char *rawBlob()                 { return m_rawBlob; }
@@ -64,6 +65,7 @@ public:
 
 private:
     bool m_nicehash;
+    bool m_randnonce;
     int m_poolId;
     VAR_ALIGN(16, char m_id[64]);
     VAR_ALIGN(16, uint8_t m_blob[84]); // Max blob size is 84 (75 fixed + 9 variable), aligned to 96. https://github.com/xmrig/xmrig/issues/1 Thanks fireice-uk.

src/net/Url.cpp

@@ -25,7 +25,6 @@
 #include <string.h>
 #include <stdlib.h>
 
-
 #include "net/Url.h"
 
 
@@ -37,6 +36,7 @@
 Url::Url() :
     m_keepAlive(false),
     m_nicehash(false),
+    m_randnonce(false),
     m_host(nullptr),
     m_password(nullptr),
     m_user(nullptr),
@@ -59,6 +59,7 @@ Url::Url() :
 Url::Url(const char *url) :
     m_keepAlive(false),
     m_nicehash(false),
+    m_randnonce(false),
     m_host(nullptr),
     m_password(nullptr),
     m_user(nullptr),
@@ -68,9 +69,10 @@ Url::Url(const char *url) :
 }
 
 
-Url::Url(const char *host, uint16_t port, const char *user, const char *password, bool keepAlive, bool nicehash) :
+Url::Url(const char *host, uint16_t port, const char *user, const char *password, bool keepAlive, bool nicehash, bool randnonce) :
     m_keepAlive(keepAlive),
     m_nicehash(nicehash),
+    m_randnonce(randnonce),
     m_password(password ? strdup(password) : nullptr),
     m_user(user ? strdup(user) : nullptr),
     m_port(port)
@@ -91,6 +93,10 @@ bool Url::isNicehash() const
 {
     return isValid() && (m_nicehash || strstr(m_host, ".nicehash.com"));
 }
+bool Url::isRandNonce() const
+{
+    return m_randnonce;
+}
 
 
 bool Url::parse(const char *url)
@@ -170,6 +176,7 @@ Url &Url::operator=(const Url *other)
 {
     m_keepAlive = other->m_keepAlive;
     m_nicehash  = other->m_nicehash;
+    m_randnonce = other->m_randnonce;
     m_port      = other->m_port;
 
     free(m_host);

src/net/Url.h

@@ -37,7 +37,7 @@ public:
 
     Url();
     Url(const char *url);
-    Url(const char *host, uint16_t port, const char *user = nullptr, const char *password = nullptr, bool keepAlive = false, bool nicehash = false  );
+    Url(const char *host, uint16_t port, const char *user = nullptr, const char *password = nullptr, bool keepAlive = false, bool nicehash = false, bool randnonce = false  );
     ~Url();
 
     inline bool isKeepAlive() const          { return m_keepAlive; }
@@ -48,8 +48,10 @@ public:
     inline uint16_t port() const             { return m_port; }
     inline void setKeepAlive(bool keepAlive) { m_keepAlive = keepAlive; }
     inline void setNicehash(bool nicehash)   { m_nicehash = nicehash; }
+    inline void setRandNonce(bool randnonce) { m_randnonce = randnonce; }
 
     bool isNicehash() const;
+    bool isRandNonce() const;
     bool parse(const char *url);
     bool setUserpass(const char *userpass);
     void setPassword(const char *password);
@@ -60,6 +62,7 @@ public:
 private:
     bool m_keepAlive;
     bool m_nicehash;
+    bool m_randnonce;
     char *m_host;
     char *m_password;
     char *m_user;

src/workers/SingleWorker.cpp

@@ -54,7 +54,11 @@ void SingleWorker::start()
             }
 
             m_count++;
-            *m_job.nonce() = ++m_result.nonce;
+            if (m_job.isRandNonce()) {
+                *m_job.nonce() = m_result.nonce += rand();
+            } else {
+                *m_job.nonce() = ++m_result.nonce;
+            }
 
             if (CryptoNight::hash(m_job, m_result, m_ctx)) {
                 Workers::submit(m_result);