5 /* \summary: Per-Packet Information (DLT_PPI) printer */
8 * Per-Packet Information Header Specification - Version 1.0.7
9 * https://web.archive.org/web/20160328114748/http://www.cacetech.com/documents/PPI%20Header%20format%201.0.7.pdf
16 #include "netdissect-stdinc.h"
18 #include "netdissect.h"
22 typedef struct ppi_header {
23 nd_uint8_t ppi_ver; /* Version. Currently 0 */
24 nd_uint8_t ppi_flags; /* Flags. */
25 nd_uint16_t ppi_len; /* Length of entire message, including
26 * this header and TLV payload. */
27 nd_uint32_t ppi_dlt; /* Data Link Type of the captured
36 ppi_header_print(netdissect_options *ndo, const u_char *bp, u_int length)
38 const ppi_header_t *hdr;
43 hdr = (const ppi_header_t *)bp;
45 len = GET_LE_U_2(hdr->ppi_len);
46 dlt = GET_LE_U_4(hdr->ppi_dlt);
47 dltname = pcap_datalink_val_to_name(dlt);
49 if (!ndo->ndo_qflag) {
50 ND_PRINT("V.%u DLT %s (%u) len %u", GET_U_1(hdr->ppi_ver),
51 (dltname != NULL ? dltname : "UNKNOWN"), dlt,
54 ND_PRINT("%s", (dltname != NULL ? dltname : "UNKNOWN"));
57 ND_PRINT(", length %u: ", length);
61 * This is the top level routine of the printer. 'p' points
62 * to the ether header of the packet, 'h->ts' is the timestamp,
63 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
64 * is the number of bytes actually captured.
67 ppi_if_print(netdissect_options *ndo,
68 const struct pcap_pkthdr *h, const u_char *p)
71 const ppi_header_t *hdr;
72 u_int caplen = h->caplen;
73 u_int length = h->len;
77 struct pcap_pkthdr nhdr;
79 ndo->ndo_protocol = "ppi";
80 if (caplen < sizeof(ppi_header_t)) {
82 ndo->ndo_ll_hdr_len += caplen;
86 hdr = (const ppi_header_t *)p;
87 len = GET_LE_U_2(hdr->ppi_len);
88 if (len < sizeof(ppi_header_t) || len > 65532) {
89 /* It MUST be between 8 and 65,532 inclusive (spec 3.1.3) */
90 ND_PRINT(" [length %u < %zu or > 65532]", len,
91 sizeof(ppi_header_t));
92 nd_print_invalid(ndo);
93 ndo->ndo_ll_hdr_len += caplen;
98 * If we don't have the entire PPI header, don't
102 ndo->ndo_ll_hdr_len += caplen;
105 dlt = GET_LE_U_4(hdr->ppi_dlt);
108 ppi_header_print(ndo, p, length);
114 printer = lookup_printer(dlt);
115 if (printer != NULL) {
117 nhdr.caplen = caplen;
119 printer(ndo, &nhdr, p);
120 hdrlen = ndo->ndo_ll_hdr_len;
123 ppi_header_print(ndo, (const u_char *)hdr, length + len);
125 if (!ndo->ndo_suppress_default_print)
126 ND_DEFAULTPRINT(p, caplen);
129 ndo->ndo_ll_hdr_len += len + hdrlen;