1 /* 2 * Oracle 3 */ 4 5 #include <sys/cdefs.h> 6 #ifndef lint 7 __RCSID("$NetBSD: print-ppi.c,v 1.6 2024/09/02 16:15:32 christos Exp $"); 8 #endif 9 10 /* \summary: Per-Packet Information (DLT_PPI) printer */ 11 12 /* Specification: 13 * Per-Packet Information Header Specification - Version 1.0.7 14 * https://web.archive.org/web/20160328114748/http://www.cacetech.com/documents/PPI%20Header%20format%201.0.7.pdf 15 */ 16 17 #include <config.h> 18 19 #include "netdissect-stdinc.h" 20 21 #include "netdissect.h" 22 #include "extract.h" 23 24 25 typedef struct ppi_header { 26 nd_uint8_t ppi_ver; /* Version. Currently 0 */ 27 nd_uint8_t ppi_flags; /* Flags. */ 28 nd_uint16_t ppi_len; /* Length of entire message, including 29 * this header and TLV payload. */ 30 nd_uint32_t ppi_dlt; /* Data Link Type of the captured 31 * packet data. */ 32 } ppi_header_t; 33 34 #define PPI_HDRLEN 8 35 36 #ifdef DLT_PPI 37 38 static void 39 ppi_header_print(netdissect_options *ndo, const u_char *bp, u_int length) 40 { 41 const ppi_header_t *hdr; 42 uint16_t len; 43 uint32_t dlt; 44 const char *dltname; 45 46 hdr = (const ppi_header_t *)bp; 47 48 len = GET_LE_U_2(hdr->ppi_len); 49 dlt = GET_LE_U_4(hdr->ppi_dlt); 50 dltname = pcap_datalink_val_to_name(dlt); 51 52 if (!ndo->ndo_qflag) { 53 ND_PRINT("V.%u DLT %s (%u) len %u", GET_U_1(hdr->ppi_ver), 54 (dltname != NULL ? dltname : "UNKNOWN"), dlt, 55 len); 56 } else { 57 ND_PRINT("%s", (dltname != NULL ? dltname : "UNKNOWN")); 58 } 59 60 ND_PRINT(", length %u: ", length); 61 } 62 63 /* 64 * This is the top level routine of the printer. 'p' points 65 * to the ether header of the packet, 'h->ts' is the timestamp, 66 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 67 * is the number of bytes actually captured. 68 */ 69 void 70 ppi_if_print(netdissect_options *ndo, 71 const struct pcap_pkthdr *h, const u_char *p) 72 { 73 if_printer printer; 74 const ppi_header_t *hdr; 75 u_int caplen = h->caplen; 76 u_int length = h->len; 77 uint16_t len; 78 uint32_t dlt; 79 uint32_t hdrlen; 80 struct pcap_pkthdr nhdr; 81 82 ndo->ndo_protocol = "ppi"; 83 if (caplen < sizeof(ppi_header_t)) { 84 nd_print_trunc(ndo); 85 ndo->ndo_ll_hdr_len += caplen; 86 return; 87 } 88 89 hdr = (const ppi_header_t *)p; 90 len = GET_LE_U_2(hdr->ppi_len); 91 if (len < sizeof(ppi_header_t) || len > 65532) { 92 /* It MUST be between 8 and 65,532 inclusive (spec 3.1.3) */ 93 ND_PRINT(" [length %u < %zu or > 65532]", len, 94 sizeof(ppi_header_t)); 95 nd_print_invalid(ndo); 96 ndo->ndo_ll_hdr_len += caplen; 97 return; 98 } 99 if (caplen < len) { 100 /* 101 * If we don't have the entire PPI header, don't 102 * bother. 103 */ 104 nd_print_trunc(ndo); 105 ndo->ndo_ll_hdr_len += caplen; 106 return; 107 } 108 dlt = GET_LE_U_4(hdr->ppi_dlt); 109 110 if (ndo->ndo_eflag) 111 ppi_header_print(ndo, p, length); 112 113 length -= len; 114 caplen -= len; 115 p += len; 116 117 printer = lookup_printer(dlt); 118 if (printer != NULL) { 119 nhdr = *h; 120 nhdr.caplen = caplen; 121 nhdr.len = length; 122 printer(ndo, &nhdr, p); 123 hdrlen = ndo->ndo_ll_hdr_len; 124 } else { 125 if (!ndo->ndo_eflag) 126 ppi_header_print(ndo, (const u_char *)hdr, length + len); 127 128 if (!ndo->ndo_suppress_default_print) 129 ND_DEFAULTPRINT(p, caplen); 130 hdrlen = 0; 131 } 132 ndo->ndo_ll_hdr_len += len + hdrlen; 133 } 134 #endif /* DLT_PPI */ 135