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

   1 /*
   2  * Oracle
   3  */
   4
   5 #ifdef HAVE_CONFIG_H
   6 #include "config.h"
   7 #endif
   8
   9 #include <netdissect-stdinc.h>
  10
  11 #include "netdissect.h"
  12 #include "extract.h"
  13
  14 typedef struct ppi_header {
  15         uint8_t         ppi_ver;
  16         uint8_t         ppi_flags;
  17         uint16_t        ppi_len;
  18         uint32_t        ppi_dlt;
  19 } ppi_header_t;
  20
  21 #define PPI_HDRLEN      8
  22
  23 #ifdef DLT_PPI
  24
  25 static inline void
  26 ppi_header_print(netdissect_options *ndo, const u_char *bp, u_int length)
  27 {
  28         const ppi_header_t *hdr;
  29         uint16_t len;
  30         uint32_t dlt;
  31
  32         hdr = (const ppi_header_t *)bp;
  33
  34         len = EXTRACT_LE_16BITS(&hdr->ppi_len);
  35         dlt = EXTRACT_LE_32BITS(&hdr->ppi_dlt);
  36
  37         if (!ndo->ndo_qflag) {
  38                 ND_PRINT((ndo, "V.%d DLT %s (%d) len %d", hdr->ppi_ver,
  39                           pcap_datalink_val_to_name(dlt), dlt,
  40                           len));
  41         } else {
  42                 ND_PRINT((ndo, "%s", pcap_datalink_val_to_name(dlt)));
  43         }
  44
  45         ND_PRINT((ndo, ", length %u: ", length));
  46 }
  47
  48 static u_int
  49 ppi_print(netdissect_options *ndo,
  50                const struct pcap_pkthdr *h, const u_char *p)
  51 {
  52         if_printer printer;
  53         const ppi_header_t *hdr;
  54         u_int caplen = h->caplen;
  55         u_int length = h->len;
  56         uint16_t len;
  57         uint32_t dlt;
  58         uint32_t hdrlen;
  59         struct pcap_pkthdr nhdr;
  60
  61         if (caplen < sizeof(ppi_header_t)) {
  62                 ND_PRINT((ndo, "[|ppi]"));
  63                 return (caplen);
  64         }
  65
  66         hdr = (const ppi_header_t *)p;
  67         len = EXTRACT_LE_16BITS(&hdr->ppi_len);
  68         if (caplen < len) {
  69                 /*
  70                  * If we don't have the entire PPI header, don't
  71                  * bother.
  72                  */
  73                 ND_PRINT((ndo, "[|ppi]"));
  74                 return (caplen);
  75         }
  76         if (len < sizeof(ppi_header_t)) {
  77                 ND_PRINT((ndo, "[|ppi]"));
  78                 return (len);
  79         }
  80         dlt = EXTRACT_LE_32BITS(&hdr->ppi_dlt);
  81
  82         if (ndo->ndo_eflag)
  83                 ppi_header_print(ndo, p, length);
  84
  85         length -= len;
  86         caplen -= len;
  87         p += len;
  88
  89         if ((printer = lookup_printer(dlt)) != NULL) {
  90                 nhdr = *h;
  91                 nhdr.caplen = caplen;
  92                 nhdr.len = length;
  93                 hdrlen = printer(ndo, &nhdr, p);
  94         } else {
  95                 if (!ndo->ndo_eflag)
  96                         ppi_header_print(ndo, (const u_char *)hdr, length + len);
  97
  98                 if (!ndo->ndo_suppress_default_print)
  99                         ND_DEFAULTPRINT(p, caplen);
 100                 hdrlen = 0;
 101         }
 102         return (len + hdrlen);
 103 }
 104
 105 /*
 106  * This is the top level routine of the printer.  'p' points
 107  * to the ether header of the packet, 'h->ts' is the timestamp,
 108  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 109  * is the number of bytes actually captured.
 110  */
 111 u_int
 112 ppi_if_print(netdissect_options *ndo,
 113                const struct pcap_pkthdr *h, const u_char *p)
 114 {
 115         return (ppi_print(ndo, h, p));
 116 }
 117
 118 /*
 119  * Local Variables:
 120  * c-style: whitesmith
 121  * c-basic-offset: 8
 122  * End:
 123  */
 124
 125 #endif /* DLT_PPI */