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https://github.com/the-tcpdump-group/tcpdump.git
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ef5323efe6
ICHECK like Invalid-Check.
Reminder: If the checked expression is true an error message is printed
and a 'goto invalid' is executed.
This change adds the parameter 'operator'.
Before this change, '<' comparison was hard coded.
We can do now:
ND_ICHECK_U(length, <, HEADER_LEN);
ND_ICHECK_U(length, ==, 24);
ND_ICHECK_U(length, !=, 8);
ND_ICHECK_ZU(length, <, sizeof(struct my_struct));
ND_ICHECKMSG_U("message length", msg_tlen, <, 4);
...
(Any comparison operator)
Remark: The change of names from ND_LCHECK*() to ND_ICHECK*() is
because something else than a length(L) can be checked.
Moreover:
Place the 'message' parameter at the beginning of ND_ICHECKMSG_U()
and ND_ICHECKMSG_ZU() paramaters lists.
268 lines
6.7 KiB
C
268 lines
6.7 KiB
C
/*
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* Copyright (c) 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Contributed by Brad Parker (brad@fcr.com).
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*/
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/* \summary: Novell IPX 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 <stdio.h>
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#define ND_LONGJMP_FROM_TCHECK
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "extract.h"
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/* well-known sockets */
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#define IPX_SKT_NCP 0x0451
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#define IPX_SKT_SAP 0x0452
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#define IPX_SKT_RIP 0x0453
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#define IPX_SKT_NETBIOS 0x0455
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#define IPX_SKT_DIAGNOSTICS 0x0456
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#define IPX_SKT_NWLINK_DGM 0x0553 /* NWLink datagram, may contain SMB */
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#define IPX_SKT_EIGRP 0x85be /* Cisco EIGRP over IPX */
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/* IPX transport header */
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struct ipxHdr {
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nd_uint16_t cksum; /* Checksum */
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nd_uint16_t length; /* Length, in bytes, including header */
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nd_uint8_t tCtl; /* Transport Control (i.e. hop count) */
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nd_uint8_t pType; /* Packet Type (i.e. level 2 protocol) */
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nd_uint32_t dstNet; /* destination net */
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nd_mac_addr dstNode; /* destination node */
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nd_uint16_t dstSkt; /* destination socket */
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nd_uint32_t srcNet; /* source net */
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nd_mac_addr srcNode; /* source node */
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nd_uint16_t srcSkt; /* source socket */
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};
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#define ipxSize 30
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static const char *ipxaddr_string(netdissect_options *, uint32_t, const u_char *);
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static void ipx_decode(netdissect_options *, const struct ipxHdr *, const u_char *, u_int);
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static void ipx_sap_print(netdissect_options *, const u_char *, u_int);
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static void ipx_rip_print(netdissect_options *, const u_char *, u_int);
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/*
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* Print IPX datagram packets.
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*/
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void
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ipx_print(netdissect_options *ndo, const u_char *p, u_int length)
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{
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const struct ipxHdr *ipx = (const struct ipxHdr *)p;
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ndo->ndo_protocol = "ipx";
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if (!ndo->ndo_eflag)
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ND_PRINT("IPX ");
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ND_PRINT("%s.%04x > ",
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ipxaddr_string(ndo, GET_BE_U_4(ipx->srcNet), ipx->srcNode),
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GET_BE_U_2(ipx->srcSkt));
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ND_PRINT("%s.%04x: ",
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ipxaddr_string(ndo, GET_BE_U_4(ipx->dstNet), ipx->dstNode),
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GET_BE_U_2(ipx->dstSkt));
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/* take length from ipx header */
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length = GET_BE_U_2(ipx->length);
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if (length < ipxSize) {
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ND_PRINT("[length %u < %u]", length, ipxSize);
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nd_print_invalid(ndo);
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return;
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}
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ipx_decode(ndo, ipx, p + ipxSize, length - ipxSize);
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}
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static const char *
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ipxaddr_string(netdissect_options *ndo, uint32_t net, const u_char *node)
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{
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static char line[256];
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snprintf(line, sizeof(line), "%08x.%02x:%02x:%02x:%02x:%02x:%02x",
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net, GET_U_1(node), GET_U_1(node + 1),
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GET_U_1(node + 2), GET_U_1(node + 3),
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GET_U_1(node + 4), GET_U_1(node + 5));
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return line;
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}
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static void
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ipx_decode(netdissect_options *ndo, const struct ipxHdr *ipx, const u_char *datap, u_int length)
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{
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u_short dstSkt;
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dstSkt = GET_BE_U_2(ipx->dstSkt);
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switch (dstSkt) {
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case IPX_SKT_NCP:
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ND_PRINT("ipx-ncp %u", length);
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break;
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case IPX_SKT_SAP:
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ipx_sap_print(ndo, datap, length);
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break;
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case IPX_SKT_RIP:
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ipx_rip_print(ndo, datap, length);
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break;
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case IPX_SKT_NETBIOS:
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ND_PRINT("ipx-netbios %u", length);
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#ifdef ENABLE_SMB
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ipx_netbios_print(ndo, datap, length);
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#endif
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break;
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case IPX_SKT_DIAGNOSTICS:
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ND_PRINT("ipx-diags %u", length);
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break;
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case IPX_SKT_NWLINK_DGM:
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ND_PRINT("ipx-nwlink-dgm %u", length);
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#ifdef ENABLE_SMB
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ipx_netbios_print(ndo, datap, length);
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#endif
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break;
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case IPX_SKT_EIGRP:
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eigrp_print(ndo, datap, length);
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break;
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default:
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ND_PRINT("ipx-#%x %u", dstSkt, length);
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break;
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}
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}
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static void
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ipx_sap_print(netdissect_options *ndo, const u_char *ipx, u_int length)
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{
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int command, i;
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command = GET_BE_U_2(ipx);
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ND_ICHECK_U(length, <, 2);
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ipx += 2;
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length -= 2;
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switch (command) {
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case 1:
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case 3:
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if (command == 1)
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ND_PRINT("ipx-sap-req");
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else
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ND_PRINT("ipx-sap-nearest-req");
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ND_PRINT(" %s", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
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break;
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case 2:
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case 4:
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if (command == 2)
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ND_PRINT("ipx-sap-resp");
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else
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ND_PRINT("ipx-sap-nearest-resp");
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for (i = 0; i < 8 && length != 0; i++) {
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ND_TCHECK_2(ipx);
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if (length < 2)
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goto invalid;
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ND_PRINT(" %s '", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
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ipx += 2;
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length -= 2;
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if (length < 48) {
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ND_PRINT("'");
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goto invalid;
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}
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nd_printjnp(ndo, ipx, 48);
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ND_PRINT("'");
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ipx += 48;
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length -= 48;
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/*
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* 10 bytes of IPX address.
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*/
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ND_TCHECK_LEN(ipx, 10);
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if (length < 10)
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goto invalid;
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ND_PRINT(" addr %s",
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ipxaddr_string(ndo, GET_BE_U_4(ipx), ipx + 4));
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ipx += 10;
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length -= 10;
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/*
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* 2 bytes of socket and 2 bytes of number of intermediate
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* networks.
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*/
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ND_TCHECK_4(ipx);
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if (length < 4)
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goto invalid;
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ipx += 4;
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length -= 4;
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}
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break;
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default:
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ND_PRINT("ipx-sap-?%x", command);
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break;
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}
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return;
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invalid:
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nd_print_invalid(ndo);
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}
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static void
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ipx_rip_print(netdissect_options *ndo, const u_char *ipx, u_int length)
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{
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int command, i;
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command = GET_BE_U_2(ipx);
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ND_ICHECK_U(length, <, 2);
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ipx += 2;
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length -= 2;
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switch (command) {
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case 1:
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ND_PRINT("ipx-rip-req");
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if (length != 0) {
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if (length < 8)
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goto invalid;
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ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
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GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
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}
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break;
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case 2:
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ND_PRINT("ipx-rip-resp");
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for (i = 0; i < 50 && length != 0; i++) {
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if (length < 8)
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goto invalid;
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ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
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GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
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ipx += 8;
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length -= 8;
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}
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break;
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default:
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ND_PRINT("ipx-rip-?%x", command);
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break;
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}
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return;
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invalid:
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nd_print_invalid(ndo);
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}
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