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 typedef struct ppi_header {
  17         uint8_t         ppi_ver;
  18         uint8_t         ppi_flags;
  19         uint16_t        ppi_len;
  20         uint32_t        ppi_dlt;
  21 } ppi_header_t;
  22
  23 #define PPI_HDRLEN      8
  24
  25 #ifdef DLT_PPI
  26
  27 static inline void
  28 ppi_header_print(netdissect_options *ndo, const u_char *bp, u_int length)
  29 {
  30         const ppi_header_t *hdr;
  31         uint16_t len;
  32         uint32_t dlt;
  33
  34         hdr = (const ppi_header_t *)bp;
  35
  36         len = EXTRACT_LE_16BITS(&hdr->ppi_len);
  37         dlt = EXTRACT_LE_32BITS(&hdr->ppi_dlt);
  38
  39         if (!ndo->ndo_qflag) {
  40                 ND_PRINT((ndo, "V.%d DLT %s (%d) len %d", hdr->ppi_ver,
  41                           pcap_datalink_val_to_name(dlt), dlt,
  42                           len));
  43         } else {
  44                 ND_PRINT((ndo, "%s", pcap_datalink_val_to_name(dlt)));
  45         }
  46
  47         ND_PRINT((ndo, ", length %u: ", length));
  48 }
  49
  50 static u_int
  51 ppi_print(netdissect_options *ndo,
  52                const struct pcap_pkthdr *h, const u_char *p)
  53 {
  54         if_printer printer;
  55         const ppi_header_t *hdr;
  56         u_int caplen = h->caplen;
  57         u_int length = h->len;
  58         uint16_t len;
  59         uint32_t dlt;
  60         uint32_t hdrlen;
  61         struct pcap_pkthdr nhdr;
  62
  63         if (caplen < sizeof(ppi_header_t)) {
  64                 ND_PRINT((ndo, "[|ppi]"));
  65                 return (caplen);
  66         }
  67
  68         hdr = (const ppi_header_t *)p;
  69         len = EXTRACT_LE_16BITS(&hdr->ppi_len);
  70         if (caplen < len) {
  71                 /*
  72                  * If we don't have the entire PPI header, don't
  73                  * bother.
  74                  */
  75                 ND_PRINT((ndo, "[|ppi]"));
  76                 return (caplen);
  77         }
  78         if (len < sizeof(ppi_header_t)) {
  79                 ND_PRINT((ndo, "[|ppi]"));
  80                 return (len);
  81         }
  82         dlt = EXTRACT_LE_32BITS(&hdr->ppi_dlt);
  83
  84         if (ndo->ndo_eflag)
  85                 ppi_header_print(ndo, p, length);
  86
  87         length -= len;
  88         caplen -= len;
  89         p += len;
  90
  91         if ((printer = lookup_printer(dlt)) != NULL) {
  92                 nhdr = *h;
  93                 nhdr.caplen = caplen;
  94                 nhdr.len = length;
  95                 hdrlen = printer(ndo, &nhdr, p);
  96         } else {
  97                 if (!ndo->ndo_eflag)
  98                         ppi_header_print(ndo, (const u_char *)hdr, length + len);
  99
 100                 if (!ndo->ndo_suppress_default_print)
 101                         ND_DEFAULTPRINT(p, caplen);
 102                 hdrlen = 0;
 103         }
 104         return (len + hdrlen);
 105 }
 106
 107 /*
 108  * This is the top level routine of the printer.  'p' points
 109  * to the ether header of the packet, 'h->ts' is the timestamp,
 110  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 111  * is the number of bytes actually captured.
 112  */
 113 u_int
 114 ppi_if_print(netdissect_options *ndo,
 115                const struct pcap_pkthdr *h, const u_char *p)
 116 {
 117         return (ppi_print(ndo, h, p));
 118 }
 119
 120 /*
 121  * Local Variables:
 122  * c-style: whitesmith
 123  * c-basic-offset: 8
 124  * End:
 125  */
 126
 127 #endif /* DLT_PPI */