option -c test

hydra.c

@@ -2298,11 +2298,12 @@ int main(int argc, char *argv[]) {
   FILE *lfp = NULL, *pfp = NULL, *cfp = NULL, *ifp = NULL, *rfp = NULL, *proxyfp;
   size_t countinfile = 1, sizeinfile = 0;
   unsigned long int math2;
-  int i = 0, j = 0, k, error = 0, modusage = 0, ignore_restore = 0;
+  int i = 0, j = 0, k, error = 0, modusage = 0, ignore_restore = 0, do_switch;
-  int head_no = 0, target_no = 0, exit_condition = 0, readres;
+  int head_no = 0, target_no = 0, exit_condition = 0, readres, time_next_attempt = 0;
   time_t starttime, elapsed_status, elapsed_restore, status_print = 59, tmp_time;
   char *tmpptr, *tmpptr2;
   char rc, buf[MAXBUF];
+  time_t last_attempt = 0;
   fd_set fdreadheads;
   int max_fd;
   struct addrinfo hints, *res, *p;
@@ -2421,7 +2422,7 @@ int main(int argc, char *argv[]) {
     help(1);
   if (argc < 2)
     help(0);
-  while ((i = getopt(argc, argv, "hIq64Rde:vVl:fFg:L:p:OP:o:b:M:C:t:T:m:w:W:s:SUux:y")) >= 0) {
+  while ((i = getopt(argc, argv, "hIq64Rde:vVl:fFg:L:p:OP:o:b:M:C:t:T:m:w:W:s:SUux:yc:")) >= 0) {
     switch (i) {
     case 'h':
       help(1);
@@ -2542,6 +2543,13 @@ int main(int argc, char *argv[]) {
     case 's':
       hydra_options.port = port = atoi(optarg);
       break;
+    case 'c':
+#ifdef MSG_PEEK
+      time_next_attempt = atoi(optarg);
+#else
+      fprintf(stderr, "[WARNING] -c option can not be used as your operating system is missing the MSG_PEEK feature\n");
+#endif
+      break;
     case 'S':
 #ifndef LIBOPENSSL
       fprintf(stderr, "[WARNING] hydra was compiled without SSL support. Install openssl and recompile! Option ignored...\n");
@@ -2611,6 +2619,8 @@ int main(int argc, char *argv[]) {
       printf("%s ", argv[i]);
     printf("\n");
   }
+  if (hydra_options.tasks > 0 && time_next_attempt)
+    fprintf(stderr, "[WARNING] when using the -c option, you should also set the task per target to one (-t 1)\n");
   if (hydra_options.login != NULL && hydra_options.loginfile != NULL)
     bail("You can only use -L OR -l, not both\n");
   if (hydra_options.pass != NULL && hydra_options.passfile != NULL)
@@ -3864,6 +3874,7 @@ int main(int argc, char *argv[]) {
     for (head_no = 0; head_no < hydra_options.max_use; head_no++) {
       if (debug > 1 && hydra_heads[head_no]->active != -1)
         printf("[DEBUG] head_no[%d] to target_no %d active %d\n", head_no, hydra_heads[head_no]->target_no, hydra_heads[head_no]->active);
+       
       switch (hydra_heads[head_no]->active) {
       case -1:
         // disabled head, ignored
@@ -3888,6 +3899,15 @@ int main(int argc, char *argv[]) {
         break;
       case 1:
         if (FD_ISSET(hydra_heads[head_no]->sp[0], &fdreadheads)) {
+          do_switch = 1;
+          if (time_next_attempt > 0) {
+            if (last_attempt + time_next_attempt >= time(NULL)) {
+              if (recv(hydra_heads[head_no]->sp[0], &rc, 1, MSG_PEEK) == 1  && (rc == 'N' || rc == 'n'))
+                do_switch = 0;
+            } else
+              last_attempt = time(NULL);
+          }
+          if (do_switch) {
             readres = read_safe(hydra_heads[head_no]->sp[0], &rc, 1);
             if (readres > 0) {
               FD_CLR(hydra_heads[head_no]->sp[0], &fdreadheads);
@@ -4028,13 +4048,14 @@ int main(int argc, char *argv[]) {
               default:
                 fprintf(stderr, "[ERROR] child %d sent nonsense data, killing and restarting it!\n", head_no);
                 hydra_increase_fail_count(hydra_heads[head_no]->target_no, head_no);
-            }
+              } // end switch
-          }
+            } // readres
             if (readres == -1) {
               if (verbose)
                 fprintf(stderr, "[WARNING] child %d seems to have died, restarting (this only happens if a module is bad) ... \n", head_no);
               hydra_increase_fail_count(hydra_heads[head_no]->target_no, head_no);
             }
+          } // end do_switch
         } else {
           if (hydra_heads[head_no]->last_seen + hydra_options.waittime > tmp_time) {
             // check if recover of timed-out head is necessary