Add '-Wunreachable-code-return' warning option in devel mode for cmake

[tcpdump] / print-802_15_4.c

diff --git a/print-802_15_4.c b/print-802_15_4.c
index cf5f637a7b253dcc14e2dac9a3adc6d33ab01dd5..f9f05d2f3f5d20055042f2b5bc142b2d5dca34e4 100644 (file)
--- a/print-802_15_4.c
+++ b/print-802_15_4.c
@@ -20,16 +20,15 @@
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 

+/* \summary: IEEE 802.15.4 printer */
+

 #ifdef HAVE_CONFIG_H
 #ifdef HAVE_CONFIG_H

-#include "config.h"
+#include <config.h>

 #endif
 
 #endif
 

-#include <tcpdump-stdinc.h>
-
-#include <stdio.h>
-#include <string.h>
+#include "netdissect-stdinc.h"

 
 

-#include "interface.h"
+#include "netdissect.h"

 #include "addrtoname.h"
 
 #include "extract.h"
 #include "addrtoname.h"
 
 #include "extract.h"


@@ -39,144 +38,195 @@ static const char *ftypes[] = {
        "Data",                         /* 1 */
        "ACK",                          /* 2 */
        "Command",                      /* 3 */
        "Data",                         /* 1 */
        "ACK",                          /* 2 */
        "Command",                      /* 3 */

-       "Reserved",                     /* 4 */
-       "Reserved",                     /* 5 */
-       "Reserved",                     /* 6 */
-       "Reserved",                     /* 7 */
+       "Reserved (0x4)",               /* 4 */
+       "Reserved (0x5)",               /* 5 */
+       "Reserved (0x6)",               /* 6 */
+       "Reserved (0x7)",               /* 7 */

 };
 
 };
 

-static int
-extract_header_length(u_int16_t fc)
-{
-       int len = 0;
-
-       switch ((fc >> 10) & 0x3) {
-       case 0x00:
-               if (fc & (1 << 6)) /* intra-PAN with none dest addr */
-                       return -1;
-               break;
-       case 0x01:
-               return -1;
-       case 0x02:
-               len += 4;
-               break;
-       case 0x03:
-               len += 10;
-               break;
-       }
-
-       switch ((fc >> 14) & 0x3) {
-       case 0x00:
-               break;
-       case 0x01:
-               return -1;
-       case 0x02:
-               len += 4;
-               break;
-       case 0x03:
-               len += 10;
-               break;
-       }
-
-       if (fc & (1 << 6)) {
-               if (len < 2)
-                       return -1;
-               len -= 2;
-       }
-
-       return len;
-}
-
-
-u_int
-ieee802_15_4_if_print(struct netdissect_options *ndo,
-                      const struct pcap_pkthdr *h, const u_char *p)
+/*
+ * Frame Control subfields.
+ */
+#define FC_FRAME_TYPE(fc)              ((fc) & 0x7)
+#define FC_SECURITY_ENABLED            0x0008
+#define FC_FRAME_PENDING               0x0010
+#define FC_ACK_REQUEST                 0x0020
+#define FC_PAN_ID_COMPRESSION          0x0040
+#define FC_DEST_ADDRESSING_MODE(fc)    (((fc) >> 10) & 0x3)
+#define FC_FRAME_VERSION(fc)           (((fc) >> 12) & 0x3)
+#define FC_SRC_ADDRESSING_MODE(fc)     (((fc) >> 14) & 0x3)
+
+#define FC_ADDRESSING_MODE_NONE                0x00
+#define FC_ADDRESSING_MODE_RESERVED    0x01
+#define FC_ADDRESSING_MODE_SHORT       0x02
+#define FC_ADDRESSING_MODE_LONG                0x03
+
+static u_int
+ieee802_15_4_print(netdissect_options *ndo,
+                   const u_char *p, u_int caplen)

 {
 {

-       u_int caplen = h->caplen;
-       int hdrlen;
-       u_int16_t fc;
-       u_int8_t seq;
+       u_int hdrlen;
+       uint16_t fc;
+       uint8_t seq;
+       uint16_t panid = 0;

 
 

+       ndo->ndo_protocol = "802.15.4";

        if (caplen < 3) {
        if (caplen < 3) {

-               ND_PRINT((ndo, "[|802.15.4] %x", caplen));
+               nd_print_trunc(ndo);

                return caplen;
        }
                return caplen;
        }

+       hdrlen = 3;

 
 

-       fc = EXTRACT_LE_16BITS(p);
-       hdrlen = extract_header_length(fc);
-
-       seq = EXTRACT_LE_8BITS(p + 2);
+       fc = EXTRACT_LE_U_2(p);
+       seq = EXTRACT_U_1(p + 2);

 
        p += 3;
        caplen -= 3;
 
 
        p += 3;
        caplen -= 3;
 

-       ND_PRINT((ndo,"IEEE 802.15.4 %s packet ", ftypes[fc & 0x7]));
-       if (vflag)
-               ND_PRINT((ndo,"seq %02x ", seq));
-       if (hdrlen == -1) {
-               ND_PRINT((ndo,"malformed! "));
-               return caplen;
+       ND_PRINT("IEEE 802.15.4 %s packet ", ftypes[FC_FRAME_TYPE(fc)]);
+       if (ndo->ndo_vflag)
+               ND_PRINT("seq %02x ", seq);
+
+       /*
+        * Destination address and PAN ID, if present.
+        */
+       switch (FC_DEST_ADDRESSING_MODE(fc)) {
+       case FC_ADDRESSING_MODE_NONE:
+               if (fc & FC_PAN_ID_COMPRESSION) {
+                       /*
+                        * PAN ID compression; this requires that both
+                        * the source and destination addresses be present,
+                        * but the destination address is missing.
+                        */
+                       nd_print_trunc(ndo);
+                       return hdrlen;
+               }
+               if (ndo->ndo_vflag)
+                       ND_PRINT("none ");
+               break;
+       case FC_ADDRESSING_MODE_RESERVED:
+               if (ndo->ndo_vflag)
+                       ND_PRINT("reserved destination addressing mode");
+               return hdrlen;
+       case FC_ADDRESSING_MODE_SHORT:
+               if (caplen < 2) {
+                       nd_print_trunc(ndo);
+                       return hdrlen;
+               }
+               panid = EXTRACT_LE_U_2(p);
+               p += 2;
+               caplen -= 2;
+               hdrlen += 2;
+               if (caplen < 2) {
+                       nd_print_trunc(ndo);
+                       return hdrlen;
+               }
+               if (ndo->ndo_vflag)
+                       ND_PRINT("%04x:%04x ", panid, EXTRACT_LE_U_2(p));
+               p += 2;
+               caplen -= 2;
+               hdrlen += 2;
+               break;
+       case FC_ADDRESSING_MODE_LONG:
+               if (caplen < 2) {
+                       nd_print_trunc(ndo);
+                       return hdrlen;
+               }
+               panid = EXTRACT_LE_U_2(p);
+               p += 2;
+               caplen -= 2;
+               hdrlen += 2;
+               if (caplen < 8) {
+                       nd_print_trunc(ndo);
+                       return hdrlen;
+               }
+               if (ndo->ndo_vflag)
+                       ND_PRINT("%04x:%s ", panid, le64addr_string(ndo, p));
+               p += 8;
+               caplen -= 8;
+               hdrlen += 8;
+               break;

        }
        }

-
-
-       if (!vflag) {
-               p+= hdrlen;
-               caplen -= hdrlen;
-       } else {
-               u_int16_t panid = 0;
-
-               switch ((fc >> 10) & 0x3) {
-               case 0x00:
-                       ND_PRINT((ndo,"none "));
-                       break;
-               case 0x01:
-                       ND_PRINT((ndo,"reserved destination addressing mode"));
-                       return 0;
-               case 0x02:
-                       panid = EXTRACT_LE_16BITS(p);
-                       p += 2;
-                       ND_PRINT((ndo,"%04x:%04x ", panid, EXTRACT_LE_16BITS(p)));
-                       p += 2;
-                       break;
-               case 0x03:
-                       panid = EXTRACT_LE_16BITS(p);
+       if (ndo->ndo_vflag)
+               ND_PRINT("< ");
+
+       /*
+        * Source address and PAN ID, if present.
+        */
+       switch (FC_SRC_ADDRESSING_MODE(fc)) {
+       case FC_ADDRESSING_MODE_NONE:
+               if (ndo->ndo_vflag)
+                       ND_PRINT("none ");
+               break;
+       case FC_ADDRESSING_MODE_RESERVED:
+               if (ndo->ndo_vflag)
+                       ND_PRINT("reserved source addressing mode");
+               return 0;
+       case FC_ADDRESSING_MODE_SHORT:
+               if (!(fc & FC_PAN_ID_COMPRESSION)) {
+                       /*
+                        * The source PAN ID is not compressed out, so
+                        * fetch it.  (Otherwise, we'll use the destination
+                        * PAN ID, fetched above.)
+                        */
+                       if (caplen < 2) {
+                               nd_print_trunc(ndo);
+                               return hdrlen;
+                       }
+                       panid = EXTRACT_LE_U_2(p);

                        p += 2;
                        p += 2;

-                       ND_PRINT((ndo,"%04x:%s ", panid, le64addr_string(p)));
-                       p += 8;
-                       break;
+                       caplen -= 2;
+                       hdrlen += 2;
+               }
+               if (caplen < 2) {
+                       nd_print_trunc(ndo);
+                       return hdrlen;

                }
                }

-               ND_PRINT((ndo,"< ");
-
-               switch ((fc >> 14) & 0x3) {
-               case 0x00:
-                       ND_PRINT((ndo,"none "));
-                       break;
-               case 0x01:
-                       ND_PRINT((ndo,"reserved source addressing mode"));
-                       return 0;
-               case 0x02:
-                       if (!(fc & (1 << 6))) {
-                               panid = EXTRACT_LE_16BITS(p);
-                               p += 2;
+               if (ndo->ndo_vflag)
+                       ND_PRINT("%04x:%04x ", panid, EXTRACT_LE_U_2(p));
+               p += 2;
+               caplen -= 2;
+               hdrlen += 2;
+               break;
+       case FC_ADDRESSING_MODE_LONG:
+               if (!(fc & FC_PAN_ID_COMPRESSION)) {
+                       /*
+                        * The source PAN ID is not compressed out, so
+                        * fetch it.  (Otherwise, we'll use the destination
+                        * PAN ID, fetched above.)
+                        */
+                       if (caplen < 2) {
+                               nd_print_trunc(ndo);
+                               return hdrlen;

                        }
                        }

-                       ND_PRINT((ndo,"%04x:%04x ", panid, EXTRACT_LE_16BITS(p)));
+                       panid = EXTRACT_LE_U_2(p);

                        p += 2;
                        p += 2;

-                       break;
-               case 0x03:
-                       if (!(fc & (1 << 6))) {
-                               panid = EXTRACT_LE_16BITS(p);
-                               p += 2;
-                       }
-                        ND_PRINT((ndo,"%04x:%s ", panid, le64addr_string(p))));
-                       p += 8;
-                       break;
+                       caplen -= 2;
+                       hdrlen += 2;

                }
                }

-
-               caplen -= hdrlen;
+               if (caplen < 8) {
+                       nd_print_trunc(ndo);
+                       return hdrlen;
+               }
+               if (ndo->ndo_vflag)
+                       ND_PRINT("%04x:%s ", panid, le64addr_string(ndo, p));
+               p += 8;
+               caplen -= 8;
+               hdrlen += 8;
+               break;

        }
 
        }
 

-       if (!suppress_default_print)
-               (ndo->ndo_default_print)(ndo, p, caplen);
+       if (!ndo->ndo_suppress_default_print)
+               ND_DEFAULTPRINT(p, caplen);
+
+       return hdrlen;
+}

 
 

-       return 0;
+/* For DLT_IEEE802_15_4 and DLT_IEEE802_15_4_NOFCS */
+u_int
+ieee802_15_4_if_print(netdissect_options *ndo,
+                      const struct pcap_pkthdr *h, const u_char *p)
+{
+       ndo->ndo_protocol = "802.15.4_if";
+       return ieee802_15_4_print(ndo, p, h->caplen);

 }
 }