File libnet-1.1.2.1-strict-aliasing-fix.diff of Package libnet

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File libnet-1.1.2.1-strict-aliasing-fix.diff of Package libnet (Revision 9ef0b3074e282bf8a555d03ea4e4da50)

Currently displaying revision 9ef0b3074e282bf8a555d03ea4e4da50 , Show latest

--- src/libnet_resolve.c
+++ src/libnet_resolve.c
@@ -370,7 +370,11 @@
     int i;
     int32_t l;
     int8_t *pp;
-        
+    union {
+	int8_t *ipp;
+	char *cpp;
+    } upp = { &pp };
+ 
     while (isspace(*s))
     {
         s++;
@@ -390,7 +394,7 @@
     /* expect len hex octets separated by ':' */
     for (i = 0; i < *len + 1; i++)
     {
-        l = strtol(s, (char **)&pp, 16);
+        l = strtol(s, upp.cpp, 16);
         if (pp == s || l > 0xff || l < 0)
         {
             *len = 0;
--- src/libnet_checksum.c
+++ src/libnet_checksum.c
@@ -58,6 +58,27 @@
     return (sum);
 }
 
+#include <assert.h>
+/* same as above, just takes *u_int32_t */
+int
+libnet_in_cksum32(u_int32_t *addr32, int len)
+{
+    int sum;
+
+    sum = 0;
+
+    while (len > 3)
+    {
+        sum += (*addr32) >> 16;
+        sum += (*addr32) & 0x0000ffff;
+        len -= 4;
+        addr32++;
+    }
+    assert(len == 0);
+
+    return (sum);
+}
+
 int
 libnet_toggle_checksum(libnet_t *l, libnet_ptag_t ptag, int mode)
 {
@@ -173,7 +194,7 @@
             }
             else
             {
-                sum = libnet_in_cksum((u_int16_t *)&iph_p->ip_src, 8);
+                sum = libnet_in_cksum32((u_int32_t *)&iph_p->ip_src, 8);
             }
             sum += ntohs(IPPROTO_TCP + len);
             sum += libnet_in_cksum((u_int16_t *)tcph_p, len);
@@ -191,7 +212,7 @@
             }
             else
             {
-                sum = libnet_in_cksum((u_int16_t *)&iph_p->ip_src, 8);
+                sum = libnet_in_cksum32((u_int32_t *)&iph_p->ip_src, 8);
             }
             sum += ntohs(IPPROTO_UDP + len);
             sum += libnet_in_cksum((u_int16_t *)udph_p, len);

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File libnet-1.1.2.1-strict-aliasing-fix.diff of Package libnet (Revision 9ef0b3074e282bf8a555d03ea4e4da50)

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