more modularization

[svn/Prometheus-QoS/.git] / ipv4subnets.c

diff --git a/ipv4subnets.c b/ipv4subnets.c
new file mode 100644 (file)
index 0000000..0b40229
--- /dev/null
+++ b/ipv4subnets.c
@@ -0,0 +1,101 @@
+#include "cll1-0.6.2.h"\r
+\r
+/* ====== iptables indexes are used to reduce complexity to log8(N) ===== */\r
+\r
+char *very_ugly_ipv4_code(char *inip, int bitmask, int format_as_chainname)\r
+{\r
+ /* warning: this function was debugged only for bitmask values 20,24,28 !!!*/\r
+ int dot=0, n;\r
+ char *ip,*outip,*outptr,*fmt;\r
+\r
+ duplicate(inip,ip);\r
+ /* debug printf("(%s,%d) -> ",ip,bitmask); */\r
+\r
+ if(ip && *ip && bitmask>=0 && bitmask<=32)\r
+ {\r
+  string(outip,strlen(ip)+10); /*fuck unicode? assertion: 10>strlen("_%d_%d") */\r
+ }\r
+ else \r
+ {\r
+  /* should never exit here */\r
+  return "undefined";\r
+ }\r
+ outptr=outip;\r
+ while(ip && *ip)\r
+ {\r
+  if(*ip=='.')\r
+  {\r
+   if(dot<(bitmask/8-1)) \r
+   {\r
+    if(format_as_chainname)\r
+    {\r
+     *outptr='_';\r
+    }\r
+    else\r
+    {\r
+     *outptr='.';\r
+    }\r
+    outptr++;\r
+    dot++;\r
+   }\r
+   else\r
+   {\r
+    char *cutdot=strchr(ip+1,'.'); /*for bitmask<24*/    \r
+    if(cutdot)\r
+    {\r
+     *cutdot = '\0';\r
+    }\r
+    \r
+    if(format_as_chainname)\r
+    {\r
+     fmt = "_%d_%d";\r
+    }\r
+    else\r
+    {\r
+     fmt = ".%d";\r
+    }\r
+    \r
+    if(bitmask%8)\r
+    {\r
+     n = atoi(ip+1)-atoi(ip+1)%(1<<(8-bitmask%8));\r
+    }\r
+    else\r
+    {\r
+     n = 0;\r
+    }\r
+\r
+    /*debug  printf("%d/%d => [_%d_%d]\n",atoi(ip+1),bitmask,n,bitmask); */\r
+    sprintf(outptr,fmt,n,bitmask);\r
+    if(!format_as_chainname)\r
+    {\r
+     while(bitmask<24)\r
+     {\r
+      strcat(outip,".0");\r
+      bitmask+=8;\r
+     }\r
+    }\r
+    /* debug printf("[%s]\n",outip); */\r
+    return outip;\r
+   }\r
+  }\r
+  else \r
+  {\r
+   *outptr=*ip;\r
+   outptr++;\r
+  }\r
+  ip++;\r
+ }\r
+ /*should never exit here*/\r
+ *outptr='\0';\r
+ return outip;\r
+}\r
+\r
+char *index_id(char *ip,int bitmask)\r
+{ \r
+ return very_ugly_ipv4_code(ip,bitmask,1);\r
+}\r
+\r
+char *subnet_id(char *ip,int bitmask)\r
+{\r
+ return very_ugly_ipv4_code(ip,bitmask,0);\r
+}\r