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