1 /*
2 * Oracle
3 */
4
5 /* \summary: Per-Packet Information (DLT_PPI) printer */
6
7 /* Specification:
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
10 */
11
12 #ifdef HAVE_CONFIG_H
13 #include <config.h>
14 #endif
15
16 #include "netdissect-stdinc.h"
17
18 #include "netdissect.h"
19 #include "extract.h"
20
21
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
28 * packet data. */
29 } ppi_header_t;
30
31 #define PPI_HDRLEN 8
32
33 #ifdef DLT_PPI
34
35 static void
ppi_header_print(netdissect_options * ndo,const u_char * bp,u_int length)36 ppi_header_print(netdissect_options *ndo, const u_char *bp, u_int length)
37 {
38 const ppi_header_t *hdr;
39 uint16_t len;
40 uint32_t dlt;
41 const char *dltname;
42
43 hdr = (const ppi_header_t *)bp;
44
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);
48
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,
52 len);
53 } else {
54 ND_PRINT("%s", (dltname != NULL ? dltname : "UNKNOWN"));
55 }
56
57 ND_PRINT(", length %u: ", length);
58 }
59
60 /*
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.
65 */
66 void
ppi_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)67 ppi_if_print(netdissect_options *ndo,
68 const struct pcap_pkthdr *h, const u_char *p)
69 {
70 if_printer printer;
71 const ppi_header_t *hdr;
72 u_int caplen = h->caplen;
73 u_int length = h->len;
74 uint16_t len;
75 uint32_t dlt;
76 uint32_t hdrlen;
77 struct pcap_pkthdr nhdr;
78
79 ndo->ndo_protocol = "ppi";
80 if (caplen < sizeof(ppi_header_t)) {
81 nd_print_trunc(ndo);
82 ndo->ndo_ll_hdr_len += caplen;
83 return;
84 }
85
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;
94 return;
95 }
96 if (caplen < len) {
97 /*
98 * If we don't have the entire PPI header, don't
99 * bother.
100 */
101 nd_print_trunc(ndo);
102 ndo->ndo_ll_hdr_len += caplen;
103 return;
104 }
105 dlt = GET_LE_U_4(hdr->ppi_dlt);
106
107 if (ndo->ndo_eflag)
108 ppi_header_print(ndo, p, length);
109
110 length -= len;
111 caplen -= len;
112 p += len;
113
114 printer = lookup_printer(dlt);
115 if (printer != NULL) {
116 nhdr = *h;
117 nhdr.caplen = caplen;
118 nhdr.len = length;
119 printer(ndo, &nhdr, p);
120 hdrlen = ndo->ndo_ll_hdr_len;
121 } else {
122 if (!ndo->ndo_eflag)
123 ppi_header_print(ndo, (const u_char *)hdr, length + len);
124
125 if (!ndo->ndo_suppress_default_print)
126 ND_DEFAULTPRINT(p, caplen);
127 hdrlen = 0;
128 }
129 ndo->ndo_ll_hdr_len += len + hdrlen;
130 }
131 #endif /* DLT_PPI */
132