1 files changed, 43 insertions, 0 deletions
diff --git a/src/bin/ipgen.c b/src/bin/ipgen.c
new file mode 100644
index 0000000..7aae99e
--- /dev/null
+++ b/src/bin/ipgen.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+
+void print_ip(unsigned int i) {
+ printf("%d.%d.%d.%d\n",(i>>24)&255,(i>>16)&255,(i>>8)&255,i&255); 
+}
+
+int main(int argc,char *argv[]) {
+ if(argc < 3) {
+  printf("usage: ipgen net mask\n");
+  printf("example: ipgen 192.168.0.1 255.255.0.255\n");
+  return 1;
+ }
+ unsigned int net=htonl(inet_addr(argv[1])); 
+ unsigned int mask=htonl(inet_addr(argv[2]));
+ unsigned int i;
+ unsigned int min;
+ unsigned int max;
+ unsigned int inc=1;
+ if(!(~mask)) {//nothing to do. this is a /32
+  print_ip(net);
+  return 0;
+ }
+ for(i=0;(mask>>i&1);inc<<=1,i++);
+ min=net&mask;
+ max=net&mask|(~mask);
+ if(argc > 3) {
+  printf("net: ");
+  print_ip(net);
+  printf("mask: ");
+  print_ip(mask);
+  printf("min: ");
+  print_ip(min);
+  printf("max: ");
+  print_ip(max);
+  printf("inc: %d\n",inc);
+ }
+ for(i=min;i<=max;i+=inc) {
+  if((i&mask) == (net&mask)) {
+   print_ip(i);
+  }
+ }
+ return 0;
+}