The Tcpdump Group git mirrors - tcpdump/blob - print-ppi.c

   1 /*
   2  * Oracle
   3  */
   4
   5 /* \summary: Oracle DLT_PPI printer */
   6
   7 #ifdef HAVE_CONFIG_H
   8 #include <config.h>
   9 #endif
  10
  11 #include "netdissect-stdinc.h"
  12
  13 #include "netdissect.h"
  14 #include "extract.h"
  15
  16 static const char tstr[] = "[|ppi]";
  17
  18 typedef struct ppi_header {
  19         nd_uint8_t      ppi_ver;
  20         nd_uint8_t      ppi_flags;
  21         nd_uint16_t     ppi_len;
  22         nd_uint32_t     ppi_dlt;
  23 } ppi_header_t;
  24
  25 #define PPI_HDRLEN      8
  26
  27 #ifdef DLT_PPI
  28
  29 static void
  30 ppi_header_print(netdissect_options *ndo, const u_char *bp, u_int length)
  31 {
  32         const ppi_header_t *hdr;
  33         uint16_t len;
  34         uint32_t dlt;
  35         const char *dltname;
  36
  37         hdr = (const ppi_header_t *)bp;
  38
  39         len = EXTRACT_LE_U_2(hdr->ppi_len);
  40         dlt = EXTRACT_LE_U_4(hdr->ppi_dlt);
  41         dltname = pcap_datalink_val_to_name(dlt);
  42
  43         if (!ndo->ndo_qflag) {
  44                 ND_PRINT("V.%u DLT %s (%u) len %u", EXTRACT_U_1(hdr->ppi_ver),
  45                           (dltname != NULL ? dltname : "UNKNOWN"), dlt,
  46                           len);
  47         } else {
  48                 ND_PRINT("%s", (dltname != NULL ? dltname : "UNKNOWN"));
  49         }
  50
  51         ND_PRINT(", length %u: ", length);
  52 }
  53
  54 static u_int
  55 ppi_print(netdissect_options *ndo,
  56           const struct pcap_pkthdr *h, const u_char *p)
  57 {
  58         if_printer printer;
  59         const ppi_header_t *hdr;
  60         u_int caplen = h->caplen;
  61         u_int length = h->len;
  62         uint16_t len;
  63         uint32_t dlt;
  64         uint32_t hdrlen;
  65         struct pcap_pkthdr nhdr;
  66
  67         ndo->ndo_protocol = "ppi";
  68         if (caplen < sizeof(ppi_header_t)) {
  69                 ND_PRINT(" %s", tstr);
  70                 return (caplen);
  71         }
  72
  73         hdr = (const ppi_header_t *)p;
  74         ND_TCHECK_2(hdr->ppi_len);
  75         len = EXTRACT_LE_U_2(hdr->ppi_len);
  76         if (caplen < len) {
  77                 /*
  78                  * If we don't have the entire PPI header, don't
  79                  * bother.
  80                  */
  81                 ND_PRINT(" %s", tstr);
  82                 return (caplen);
  83         }
  84         if (len < sizeof(ppi_header_t)) {
  85                 ND_PRINT(" %s", tstr);
  86                 return (len);
  87         }
  88         ND_TCHECK_4(hdr->ppi_dlt);
  89         dlt = EXTRACT_LE_U_4(hdr->ppi_dlt);
  90
  91         if (ndo->ndo_eflag)
  92                 ppi_header_print(ndo, p, length);
  93
  94         length -= len;
  95         caplen -= len;
  96         p += len;
  97
  98         if ((printer = lookup_printer(dlt)) != NULL) {
  99                 nhdr = *h;
 100                 nhdr.caplen = caplen;
 101                 nhdr.len = length;
 102                 hdrlen = printer(ndo, &nhdr, p);
 103         } else {
 104                 if (!ndo->ndo_eflag)
 105                         ppi_header_print(ndo, (const u_char *)hdr, length + len);
 106
 107                 if (!ndo->ndo_suppress_default_print)
 108                         ND_DEFAULTPRINT(p, caplen);
 109                 hdrlen = 0;
 110         }
 111         return (len + hdrlen);
 112 trunc:
 113         return (caplen);
 114 }
 115
 116 /*
 117  * This is the top level routine of the printer.  'p' points
 118  * to the ether header of the packet, 'h->ts' is the timestamp,
 119  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 120  * is the number of bytes actually captured.
 121  */
 122 u_int
 123 ppi_if_print(netdissect_options *ndo,
 124              const struct pcap_pkthdr *h, const u_char *p)
 125 {
 126         ndo->ndo_protocol = "ppi_if";
 127         return (ppi_print(ndo, h, p));
 128 }
 129 #endif /* DLT_PPI */