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         const char *dltname;
  34
  35         hdr = (const ppi_header_t *)bp;
  36
  37         len = EXTRACT_LE_16BITS(&hdr->ppi_len);
  38         dlt = EXTRACT_LE_32BITS(&hdr->ppi_dlt);
  39         dltname = pcap_datalink_val_to_name(dlt);
  40
  41         if (!ndo->ndo_qflag) {
  42                 ND_PRINT((ndo, "V.%d DLT %s (%d) len %d", hdr->ppi_ver,
  43                           (dltname != NULL ? dltname : "UNKNOWN"), dlt,
  44                           len));
  45         } else {
  46                 ND_PRINT((ndo, "%s", (dltname != NULL ? dltname : "UNKNOWN")));
  47         }
  48
  49         ND_PRINT((ndo, ", length %u: ", length));
  50 }
  51
  52 static u_int
  53 ppi_print(netdissect_options *ndo,
  54                const struct pcap_pkthdr *h, const u_char *p)
  55 {
  56         if_printer printer;
  57         const ppi_header_t *hdr;
  58         u_int caplen = h->caplen;
  59         u_int length = h->len;
  60         uint16_t len;
  61         uint32_t dlt;
  62         uint32_t hdrlen;
  63         struct pcap_pkthdr nhdr;
  64
  65         if (caplen < sizeof(ppi_header_t)) {
  66                 ND_PRINT((ndo, "[|ppi]"));
  67                 return (caplen);
  68         }
  69
  70         hdr = (const ppi_header_t *)p;
  71         ND_TCHECK_16BITS(&hdr->ppi_len);
  72         len = EXTRACT_LE_16BITS(&hdr->ppi_len);
  73         if (caplen < len) {
  74                 /*
  75                  * If we don't have the entire PPI header, don't
  76                  * bother.
  77                  */
  78                 ND_PRINT((ndo, "[|ppi]"));
  79                 return (caplen);
  80         }
  81         if (len < sizeof(ppi_header_t)) {
  82                 ND_PRINT((ndo, "[|ppi]"));
  83                 return (len);
  84         }
  85         ND_TCHECK_32BITS(&hdr->ppi_dlt);
  86         dlt = EXTRACT_LE_32BITS(&hdr->ppi_dlt);
  87
  88         if (ndo->ndo_eflag)
  89                 ppi_header_print(ndo, p, length);
  90
  91         length -= len;
  92         caplen -= len;
  93         p += len;
  94
  95         if ((printer = lookup_printer(dlt)) != NULL) {
  96                 nhdr = *h;
  97                 nhdr.caplen = caplen;
  98                 nhdr.len = length;
  99                 hdrlen = printer(ndo, &nhdr, p);
 100         } else {
 101                 if (!ndo->ndo_eflag)
 102                         ppi_header_print(ndo, (const u_char *)hdr, length + len);
 103
 104                 if (!ndo->ndo_suppress_default_print)
 105                         ND_DEFAULTPRINT(p, caplen);
 106                 hdrlen = 0;
 107         }
 108         return (len + hdrlen);
 109 trunc:
 110         return (caplen);
 111 }
 112
 113 /*
 114  * This is the top level routine of the printer.  'p' points
 115  * to the ether header of the packet, 'h->ts' is the timestamp,
 116  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 117  * is the number of bytes actually captured.
 118  */
 119 u_int
 120 ppi_if_print(netdissect_options *ndo,
 121                const struct pcap_pkthdr *h, const u_char *p)
 122 {
 123         return (ppi_print(ndo, h, p));
 124 }
 125
 126 /*
 127  * Local Variables:
 128  * c-style: whitesmith
 129  * c-basic-offset: 8
 130  * End:
 131  */
 132
 133 #endif /* DLT_PPI */