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https://github.com/the-tcpdump-group/tcpdump.git
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757e793ca5
Currently the return value of link-layer dissectors is supposed to be the length of the link-layer header, so that it can be skipped for -x and -X. If a link-layer dissector or a called function throws an exception, it returns no value, so that length isn't available. The goal is to change all the link-layer dissectors to be void functions and dissectors should update a new field of the netdissect_options structure "link-layer header length" rather than returning it as a value. In this transition process, the link-layer dissectors will be moved, when updated, from the uint_printers[] array (named before printers[]) to the void_printers[] array. In this transition process, a new field of the netdissect_options structure, ndo_void_printer (TRUE/FALSE), set in the updated function lookup_printer(), will permit to choose between the old and new way to update the link-layer header length.
134 lines
2.7 KiB
C
134 lines
2.7 KiB
C
/*
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* Oracle
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*/
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/* \summary: Oracle DLT_PPI printer */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "netdissect-stdinc.h"
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#include "netdissect.h"
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#include "extract.h"
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typedef struct ppi_header {
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nd_uint8_t ppi_ver;
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nd_uint8_t ppi_flags;
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nd_uint16_t ppi_len;
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nd_uint32_t ppi_dlt;
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} ppi_header_t;
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#define PPI_HDRLEN 8
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#ifdef DLT_PPI
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static void
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ppi_header_print(netdissect_options *ndo, const u_char *bp, u_int length)
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{
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const ppi_header_t *hdr;
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uint16_t len;
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uint32_t dlt;
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const char *dltname;
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hdr = (const ppi_header_t *)bp;
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len = GET_LE_U_2(hdr->ppi_len);
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dlt = GET_LE_U_4(hdr->ppi_dlt);
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dltname = pcap_datalink_val_to_name(dlt);
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if (!ndo->ndo_qflag) {
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ND_PRINT("V.%u DLT %s (%u) len %u", GET_U_1(hdr->ppi_ver),
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(dltname != NULL ? dltname : "UNKNOWN"), dlt,
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len);
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} else {
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ND_PRINT("%s", (dltname != NULL ? dltname : "UNKNOWN"));
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}
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ND_PRINT(", length %u: ", length);
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}
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static u_int
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ppi_print(netdissect_options *ndo,
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const struct pcap_pkthdr *h, const u_char *p)
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{
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if_printer_t printer;
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const ppi_header_t *hdr;
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u_int caplen = h->caplen;
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u_int length = h->len;
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uint16_t len;
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uint32_t dlt;
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uint32_t hdrlen;
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struct pcap_pkthdr nhdr;
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ndo->ndo_protocol = "ppi";
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if (caplen < sizeof(ppi_header_t)) {
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nd_print_trunc(ndo);
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return (caplen);
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}
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hdr = (const ppi_header_t *)p;
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ND_TCHECK_2(hdr->ppi_len);
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len = GET_LE_U_2(hdr->ppi_len);
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if (caplen < len) {
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/*
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* If we don't have the entire PPI header, don't
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* bother.
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*/
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nd_print_trunc(ndo);
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return (caplen);
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}
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if (len < sizeof(ppi_header_t)) {
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nd_print_trunc(ndo);
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return (len);
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}
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ND_TCHECK_4(hdr->ppi_dlt);
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dlt = GET_LE_U_4(hdr->ppi_dlt);
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if (ndo->ndo_eflag)
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ppi_header_print(ndo, p, length);
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length -= len;
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caplen -= len;
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p += len;
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printer = lookup_printer(ndo, dlt);
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if (printer.printer != NULL) {
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nhdr = *h;
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nhdr.caplen = caplen;
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nhdr.len = length;
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if (ndo->ndo_void_printer == TRUE) {
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printer.void_printer(ndo, &nhdr, p);
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hdrlen = ndo->ndo_ll_header_length;
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} else
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hdrlen = printer.uint_printer(ndo, &nhdr, p);
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} else {
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if (!ndo->ndo_eflag)
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ppi_header_print(ndo, (const u_char *)hdr, length + len);
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p, caplen);
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hdrlen = 0;
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}
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return (len + hdrlen);
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trunc:
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return (caplen);
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}
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/*
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* This is the top level routine of the printer. 'p' points
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* to the ether header of the packet, 'h->ts' is the timestamp,
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* 'h->len' is the length of the packet off the wire, and 'h->caplen'
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* is the number of bytes actually captured.
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*/
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u_int
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ppi_if_print(netdissect_options *ndo,
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const struct pcap_pkthdr *h, const u_char *p)
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{
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ndo->ndo_protocol = "ppi_if";
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return (ppi_print(ndo, h, p));
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}
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#endif /* DLT_PPI */
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