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 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 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