Merge pull request #433 from wxsBSD/cap_fix

[tcpdump] / interface.h

diff --git a/interface.h b/interface.h
index 27563683b5a48ed587ac738d4e013c33ff2a6cb9..59c1eefdb790d4747dc93e38dd3722c7d55978d5 100644 (file)
--- a/interface.h
+++ b/interface.h
@@ -104,9 +104,21 @@ extern int32_t thiszone;   /* seconds offset from gmt to local time */
  * that "snapend - (l)" underflows.
  *
  * The check is for <= rather than < because "l" might be 0.
+ *
+ * We cast the pointers to uintptr_t to make sure that the compiler
+ * doesn't optimize away any of these tests (which it is allowed to
+ * do, as adding an integer to, or subtracting an integer from, a
+ * pointer assumes that the pointer is a pointer to an element of an
+ * array and that the result of the addition or subtraction yields a
+ * pointer to another member of the array, so that, for example, if
+ * you subtract a positive integer from a pointer, the result is
+ * guaranteed to be less than the original pointer value). See
+ *
+ *     http://www.kb.cert.org/vuls/id/162289
  */
-#define TTEST2(var, l) (snapend - (l) <= snapend && \
-                       (const u_char *)&(var) <= snapend - (l))
+#define TTEST2(var, l) \
+       ((uintptr_t)snapend - (l) <= (uintptr_t)snapend && \
+          (uintptr_t)&(var) <= (uintptr_t)snapend - (l))
 
 /* True if "var" was captured */
 #define TTEST(var) TTEST2(var, sizeof(var))
@@ -117,10 +129,7 @@ extern int32_t thiszone;   /* seconds offset from gmt to local time */
 /* Bail if "var" was not captured */
 #define TCHECK(var) TCHECK2(var, sizeof(var))
 
-extern int fn_print(const u_char *, const u_char *);
-extern int fn_printn(const u_char *, u_int, const u_char *);
-extern int fn_printzp(const u_char *, u_int, const u_char *);
-extern int mask2plen(u_int32_t);
+extern int mask2plen(uint32_t);
 extern const char *tok2strary_internal(const char **, int, const char *, int);
 #define        tok2strary(a,f,i) tok2strary_internal(a, sizeof(a)/sizeof(a[0]),f,i)
 
@@ -144,27 +153,26 @@ extern const char *dnnum_string(u_short);
 
 /* checksum routines */
 extern void init_checksum(void);
-extern u_int16_t verify_crc10_cksum(u_int16_t, const u_char *, int);
-extern u_int16_t create_osi_cksum(const u_int8_t *, int, int);
+extern uint16_t verify_crc10_cksum(uint16_t, const u_char *, int);
+extern uint16_t create_osi_cksum(const uint8_t *, int, int);
 
 /* The printer routines. */
 
 #include <pcap.h>
 
-extern char *q922_string(const u_char *);
 extern char *smb_errstr(int, int);
-extern const char *nt_errstr(u_int32_t);
+extern const char *nt_errstr(uint32_t);
 
 #ifdef INET6
 extern int mask62plen(const u_char *);
 #endif /*INET6*/
 
 struct cksum_vec {
-       const u_int8_t  *ptr;
+       const uint8_t   *ptr;
        int             len;
 };
-extern u_int16_t in_cksum(const struct cksum_vec *, int);
-extern u_int16_t in_cksum_shouldbe(u_int16_t, u_int16_t);
+extern uint16_t in_cksum(const struct cksum_vec *, int);
+extern uint16_t in_cksum_shouldbe(uint16_t, uint16_t);
 
 #ifndef HAVE_BPF_DUMP
 struct bpf_program;