adjust generator limit to allow an IPv4 /15

doc/fping.pod

@@ -295,7 +295,8 @@ line arguments, and 4 for a system call failure.
 =head1 RESTRICTIONS
 
 The number of addresses that can be generated using the C<-g>, C<--generate>
-option is limited to 100000.
+option is limited to 131070 (the number of host addresses in one 15-bit IPv4
+prefix).
 
 If fping was configured with C<--enable-safe-limits>, the following values are
 not allowed for non-root users:

src/fping.c

@@ -139,7 +139,7 @@ extern int h_errno;
 #define SIZE_ICMP_HDR 8 /* from ip_icmp.h */
 #define MAX_PING_DATA (MAX_IP_PACKET - SIZE_IP_HDR - SIZE_ICMP_HDR)
 
-#define MAX_GENERATE 100000 /* maximum number of hosts that -g can generate */
+#define MAX_GENERATE 131070 /* maximum number of hosts that -g can generate */
 
 /* sized so as to be like traditional ping */
 #define DEFAULT_PING_DATA_SIZE 56