* complete PPP support.
*/
+/* \summary: Point to Point Protocol (PPP) printer */
+
/*
* TODO:
* o resolve XXX as much as possible
* o BAP support
*/
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.112 2005-06-18 23:55:24 guy Exp $ (LBL)";
-#endif
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>
-#include <tcpdump-stdinc.h>
+#include "netdissect-stdinc.h"
-#ifdef __bsdi__
-#include <net/slcompress.h>
-#include <net/if_ppp.h>
-#endif
-
-#include <pcap.h>
-#include <stdio.h>
#include <stdlib.h>
-#include "interface.h"
+#include "netdissect.h"
#include "extract.h"
#include "addrtoname.h"
#include "ppp.h"
#include "chdlc.h"
#include "ethertype.h"
#include "oui.h"
+#include "netdissect-alloc.h"
/*
- * The following constatns are defined by IANA. Please refer to
- * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers
+ * The following constants are defined by IANA. Please refer to
+ * https://www.isi.edu/in-notes/iana/assignments/ppp-numbers
* for the up-to-date information.
*/
/* Protocol Codes defined in ppp.h */
-struct tok ppptype2str[] = {
+static const struct tok ppptype2str[] = {
{ PPP_IP, "IP" },
{ PPP_OSI, "OSI" },
{ PPP_NS, "NS" },
{ PPP_BACP, "BACP" },
{ PPP_BAP, "BAP" },
{ PPP_MPCP, "MLPPP-CP" },
+ { PPP_CCP, "CCP" },
{ 0, NULL }
};
#define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */
#define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */
-struct tok cpcodes[] = {
+static const struct tok cpcodes[] = {
{CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */
{CPCODES_CONF_REQ, "Conf-Request"},
{CPCODES_CONF_ACK, "Conf-Ack"},
#define LCPOPT_SDLOS 29
#define LCPOPT_PPPMUX 30
-#define LCPOPT_MIN LCPOPT_VEXT
-#define LCPOPT_MAX LCPOPT_PPPMUX
-
static const char *lcpconfopts[] = {
"Vend-Ext", /* (0) */
"MRU", /* (1) */
"deprecated(12)", /* used to be a Multi-Link-Procedure*/
"Call-Back", /* (13) */
"deprecated(14)", /* used to be a Connect-Time */
- "deprecated(15)", /* used to be a Compund-Frames */
+ "deprecated(15)", /* used to be a Compound-Frames */
"deprecated(16)", /* used to be a Nominal-Data-Encap */
"MRRU", /* (17) */
"12-Bit seq #", /* (18) */
"PPP-Muxing", /* (30) */
};
+#define NUM_LCPOPTS (sizeof(lcpconfopts) / sizeof(lcpconfopts[0]))
+
/* ECP - to be supported */
/* CCP Config Options */
/* 27-254 unassigned */
#define CCPOPT_RESV 255 /* RFC1962 */
-const struct tok ccpconfopts_values[] = {
+static const struct tok ccpconfopts_values[] = {
{ CCPOPT_OUI, "OUI" },
{ CCPOPT_PRED1, "Pred-1" },
{ CCPOPT_PRED2, "Pred-2" },
#define BACPOPT_FPEER 1 /* RFC2125 */
-const struct tok bacconfopts_values[] = {
+static const struct tok bacconfopts_values[] = {
{ BACPOPT_FPEER, "Favored-Peer" },
{0, NULL}
};
#define IPCPOPT_SECDNS 131 /* RFC1877 */
#define IPCPOPT_SECNBNS 132 /* RFC1877 */
-struct tok ipcpopt_values[] = {
+static const struct tok ipcpopt_values[] = {
{ IPCPOPT_2ADDR, "IP-Addrs" },
{ IPCPOPT_IPCOMP, "IP-Comp" },
{ IPCPOPT_ADDR, "IP-Addr" },
{ 0, NULL }
};
+#define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */
+#define IPCPOPT_IPCOMP_MINLEN 14
+
+static const struct tok ipcpopt_compproto_values[] = {
+ { PPP_VJC, "VJ-Comp" },
+ { IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" },
+ { 0, NULL }
+};
+
+static const struct tok ipcpopt_compproto_subopt_values[] = {
+ { 1, "RTP-Compression" },
+ { 2, "Enhanced RTP-Compression" },
+ { 0, NULL }
+};
/* IP6CP Config Options */
#define IP6CP_IFID 1
-struct tok ip6cpopt_values[] = {
+static const struct tok ip6cpopt_values[] = {
{ IP6CP_IFID, "Interface-ID" },
{ 0, NULL }
};
#define AUTHALG_MSCHAP1 128 /* RFC2433 */
#define AUTHALG_MSCHAP2 129 /* RFC2795 */
-struct tok authalg_values[] = {
+static const struct tok authalg_values[] = {
{ AUTHALG_CHAPMD5, "MD5" },
{ AUTHALG_MSCHAP1, "MS-CHAPv1" },
{ AUTHALG_MSCHAP2, "MS-CHAPv2" },
#define CALLBACK_X500 4 /* X.500 distinguished name */
#define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */
-struct tok ppp_callback_values[] = {
+static const struct tok ppp_callback_values[] = {
{ CALLBACK_AUTH, "UserAuth" },
{ CALLBACK_DSTR, "DialString" },
{ CALLBACK_LID, "LocalID" },
#define CHAP_SUCC 3
#define CHAP_FAIL 4
-struct tok chapcode_values[] = {
+static const struct tok chapcode_values[] = {
{ CHAP_CHAL, "Challenge" },
{ CHAP_RESP, "Response" },
{ CHAP_SUCC, "Success" },
#define PAP_AACK 2
#define PAP_ANAK 3
-struct tok papcode_values[] = {
+static const struct tok papcode_values[] = {
{ PAP_AREQ, "Auth-Req" },
{ PAP_AACK, "Auth-ACK" },
{ PAP_ANAK, "Auth-NACK" },
#define BAP_CSIND 7
#define BAP_CSRES 8
-static void handle_ctrl_proto (u_int proto,const u_char *p, int length);
-static void handle_chap (const u_char *p, int length);
-static void handle_pap (const u_char *p, int length);
-static void handle_bap (const u_char *p, int length);
-static void handle_mlppp(const u_char *p, int length);
-static int print_lcp_config_options (const u_char *p, int);
-static int print_ipcp_config_options (const u_char *p, int);
-static int print_ip6cp_config_options (const u_char *p, int);
-static int print_ccp_config_options (const u_char *p, int);
-static int print_bacp_config_options (const u_char *p, int);
-static void handle_ppp (u_int proto, const u_char *p, int length);
-static void ppp_hdlc(const u_char *p, int length);
+static u_int print_lcp_config_options(netdissect_options *, const u_char *p, u_int);
+static u_int print_ipcp_config_options(netdissect_options *, const u_char *p, u_int);
+static u_int print_ip6cp_config_options(netdissect_options *, const u_char *p, u_int);
+static u_int print_ccp_config_options(netdissect_options *, const u_char *p, u_int);
+static u_int print_bacp_config_options(netdissect_options *, const u_char *p, u_int);
+static void handle_ppp(netdissect_options *, u_int proto, const u_char *p, u_int length);
/* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */
static void
-handle_ctrl_proto(u_int proto, const u_char *pptr, int length)
+handle_ctrl_proto(netdissect_options *ndo,
+ u_int proto, const u_char *pptr, u_int length)
{
const char *typestr;
u_int code, len;
- int (*pfunc)(const u_char *, int);
- int x, j;
+ u_int (*pfunc)(netdissect_options *, const u_char *, u_int);
+ u_int tlen, advance;
const u_char *tptr;
tptr=pptr;
typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto);
- printf("%s, ",typestr);
+ ND_PRINT("%s, ", typestr);
if (length < 4) /* FIXME weak boundary checking */
goto trunc;
- TCHECK2(*tptr, 2);
+ ND_TCHECK_2(tptr);
- code = *tptr++;
-
- printf("%s (0x%02x), id %u, length %u",
- tok2str(cpcodes, "Unknown Opcode",code),
- code,
- *tptr++, /* ID */
- length+2);
+ code = GET_U_1(tptr);
+ tptr++;
- if (!vflag)
- return;
+ ND_PRINT("%s (0x%02x), id %u, length %u",
+ tok2str(cpcodes, "Unknown Opcode",code),
+ code,
+ GET_U_1(tptr), /* ID */
+ length + 2);
+ tptr++;
- if (length <= 4)
- return; /* there may be a NULL confreq etc. */
+ if (!ndo->ndo_vflag)
+ return;
- TCHECK2(*tptr, 2);
- len = EXTRACT_16BITS(tptr);
+ len = GET_BE_U_2(tptr);
tptr += 2;
- printf("\n\tencoded length %u (=Option(s) length %u)",len,len-4);
+ if (len < 4) {
+ ND_PRINT("\n\tencoded length %u (< 4))", len);
+ return;
+ }
+
+ if (len > length) {
+ ND_PRINT("\n\tencoded length %u (> packet length %u))", len, length);
+ return;
+ }
+ length = len;
+
+ ND_PRINT("\n\tencoded length %u (=Option(s) length %u)", len, len - 4);
+
+ if (length == 4)
+ return; /* there may be a NULL confreq etc. */
- if (vflag>1)
- print_unknown_data(pptr-2,"\n\t",6);
+ if (ndo->ndo_vflag > 1)
+ print_unknown_data(ndo, pptr - 2, "\n\t", 6);
switch (code) {
case CPCODES_VEXT:
if (length < 11)
break;
- TCHECK2(*tptr, 4);
- printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
+ ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr));
tptr += 4;
- TCHECK2(*tptr, 3);
- printf(" Vendor: %s (%u)",
- tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)),
- EXTRACT_24BITS(tptr));
+ ND_PRINT(" Vendor: %s (%u)",
+ tok2str(oui_values,"Unknown",GET_BE_U_3(tptr)),
+ GET_BE_U_3(tptr));
/* XXX: need to decode Kind and Value(s)? */
break;
case CPCODES_CONF_REQ:
case CPCODES_CONF_ACK:
case CPCODES_CONF_NAK:
case CPCODES_CONF_REJ:
- x = len - 4; /* Code(1), Identifier(1) and Length(2) */
+ tlen = len - 4; /* Code(1), Identifier(1) and Length(2) */
do {
switch (proto) {
case PPP_LCP:
if (pfunc == NULL) /* catch the above null pointer if unknown CP */
break;
-
- if ((j = (*pfunc)(tptr, len)) == 0)
+
+ if ((advance = (*pfunc)(ndo, tptr, len)) == 0)
+ break;
+ if (tlen < advance) {
+ ND_PRINT(" [remaining options length %u < %u]",
+ tlen, advance);
+ nd_print_invalid(ndo);
break;
- x -= j;
- tptr += j;
- } while (x > 0);
+ }
+ tlen -= advance;
+ tptr += advance;
+ } while (tlen != 0);
break;
case CPCODES_TERM_REQ:
case CPCODES_PROT_REJ:
if (length < 6)
break;
- TCHECK2(*tptr, 2);
- printf("\n\t Rejected %s Protocol (0x%04x)",
- tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)),
- EXTRACT_16BITS(tptr));
+ ND_PRINT("\n\t Rejected %s Protocol (0x%04x)",
+ tok2str(ppptype2str,"unknown", GET_BE_U_2(tptr)),
+ GET_BE_U_2(tptr));
/* XXX: need to decode Rejected-Information? - hexdump for now */
- if (len > 6) {
- printf("\n\t Rejected Packet");
- print_unknown_data(tptr+2,"\n\t ",len-2);
- }
+ if (len > 6) {
+ ND_PRINT("\n\t Rejected Packet");
+ print_unknown_data(ndo, tptr + 2, "\n\t ", len - 2);
+ }
break;
case CPCODES_ECHO_REQ:
case CPCODES_ECHO_RPL:
case CPCODES_DISC_REQ:
if (length < 8)
break;
- TCHECK2(*tptr, 4);
- printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
+ ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr));
/* XXX: need to decode Data? - hexdump for now */
- if (len > 8) {
- printf("\n\t Data");
- print_unknown_data(tptr+4,"\n\t ",len-4);
- }
+ if (len > 8) {
+ ND_PRINT("\n\t -----trailing data-----");
+ ND_TCHECK_LEN(tptr + 4, len - 8);
+ print_unknown_data(ndo, tptr + 4, "\n\t ", len - 8);
+ }
break;
case CPCODES_ID:
if (length < 8)
break;
- TCHECK2(*tptr, 4);
- printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
+ ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr));
/* RFC 1661 says this is intended to be human readable */
- if (len > 8) {
- printf("\n\t Message\n\t ");
- fn_printn(tptr+4,len-4,snapend);
- }
+ if (len > 8) {
+ ND_PRINT("\n\t Message\n\t ");
+ if (nd_printn(ndo, tptr + 4, len - 4, ndo->ndo_snapend))
+ goto trunc;
+ }
break;
case CPCODES_TIME_REM:
if (length < 12)
break;
- TCHECK2(*tptr, 4);
- printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
- TCHECK2(*(tptr + 4), 4);
- printf(", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4));
+ ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr));
+ ND_PRINT(", Seconds-Remaining %us", GET_BE_U_4(tptr + 4));
/* XXX: need to decode Message? */
break;
default:
- /* XXX this is dirty but we do not get the
- * original pointer passed to the begin
- * the PPP packet */
- if (vflag <= 1)
- print_unknown_data(pptr-2,"\n\t ",length+2);
+ /* XXX this is dirty but we do not get the
+ * original pointer passed to the begin
+ * the PPP packet */
+ if (ndo->ndo_vflag <= 1)
+ print_unknown_data(ndo, pptr - 2, "\n\t ", length + 2);
break;
}
return;
trunc:
- printf("[|%s]", typestr);
+ ND_PRINT("[|%s]", typestr);
}
/* LCP config options */
-static int
-print_lcp_config_options(const u_char *p, int length)
+static u_int
+print_lcp_config_options(netdissect_options *ndo,
+ const u_char *p, u_int length)
{
- int len, opt;
+ u_int opt, len;
if (length < 2)
return 0;
- TCHECK2(*p, 2);
- len = p[1];
- opt = p[0];
+ ND_TCHECK_2(p);
+ opt = GET_U_1(p);
+ len = GET_U_1(p + 1);
if (length < len)
return 0;
if (len < 2) {
- if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
- printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", lcpconfopts[opt],opt,len);
+ if (opt < NUM_LCPOPTS)
+ ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
+ lcpconfopts[opt], opt, len);
else
- printf("\n\tunknown LCP option 0x%02x", opt);
+ ND_PRINT("\n\tunknown LCP option 0x%02x", opt);
return 0;
}
- if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
- printf("\n\t %s Option (0x%02x), length %u: ", lcpconfopts[opt],opt,len);
+ if (opt < NUM_LCPOPTS)
+ ND_PRINT("\n\t %s Option (0x%02x), length %u", lcpconfopts[opt], opt, len);
else {
- printf("\n\tunknown LCP option 0x%02x", opt);
+ ND_PRINT("\n\tunknown LCP option 0x%02x", opt);
return len;
}
switch (opt) {
case LCPOPT_VEXT:
- if (len >= 6) {
- TCHECK2(*(p + 2), 3);
- printf("Vendor: %s (%u)",
- tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)),
- EXTRACT_24BITS(p+2));
+ if (len < 6) {
+ ND_PRINT(" (length bogus, should be >= 6)");
+ return len;
+ }
+ ND_PRINT(": Vendor: %s (%u)",
+ tok2str(oui_values,"Unknown",GET_BE_U_3(p + 2)),
+ GET_BE_U_3(p + 2));
#if 0
- TCHECK(p[5]);
- printf(", kind: 0x%02x", p[5]);
- printf(", Value: 0x")
- for (i = 0; i < len - 6; i++) {
- TCHECK(p[6 + i]);
- printf("%02x", p[6 + i]);
- }
-#endif
+ ND_PRINT(", kind: 0x%02x", GET_U_1(p + 5));
+ ND_PRINT(", Value: 0x");
+ for (i = 0; i < len - 6; i++) {
+ ND_PRINT("%02x", GET_U_1(p + 6 + i));
}
+#endif
break;
case LCPOPT_MRU:
- if (len == 4) {
- TCHECK2(*(p + 2), 2);
- printf("%u", EXTRACT_16BITS(p + 2));
+ if (len != 4) {
+ ND_PRINT(" (length bogus, should be = 4)");
+ return len;
}
+ ND_PRINT(": %u", GET_BE_U_2(p + 2));
break;
case LCPOPT_ACCM:
- if (len == 6) {
- TCHECK2(*(p + 2), 4);
- printf("0x%08x", EXTRACT_32BITS(p + 2));
+ if (len != 6) {
+ ND_PRINT(" (length bogus, should be = 6)");
+ return len;
}
+ ND_PRINT(": 0x%08x", GET_BE_U_4(p + 2));
break;
case LCPOPT_AP:
- if (len >= 4) {
- TCHECK2(*(p + 2), 2);
- printf("%s", tok2str(ppptype2str,"Unknown Auth Proto (0x04x)",EXTRACT_16BITS(p+2)));
-
- switch (EXTRACT_16BITS(p+2)) {
- case PPP_CHAP:
- TCHECK(p[4]);
- printf(", %s",tok2str(authalg_values,"Unknown Auth Alg %u",p[4]));
+ if (len < 4) {
+ ND_PRINT(" (length bogus, should be >= 4)");
+ return len;
+ }
+ ND_PRINT(": %s",
+ tok2str(ppptype2str, "Unknown Auth Proto (0x04x)", GET_BE_U_2(p + 2)));
+
+ switch (GET_BE_U_2(p + 2)) {
+ case PPP_CHAP:
+ ND_PRINT(", %s",
+ tok2str(authalg_values, "Unknown Auth Alg %u", GET_U_1(p + 4)));
break;
- case PPP_PAP: /* fall through */
- case PPP_EAP:
- case PPP_SPAP:
- case PPP_SPAP_OLD:
+ case PPP_PAP: /* fall through */
+ case PPP_EAP:
+ case PPP_SPAP:
+ case PPP_SPAP_OLD:
break;
- default:
- print_unknown_data(p,"\n\t",len);
- }
+ default:
+ print_unknown_data(ndo, p, "\n\t", len);
}
break;
case LCPOPT_QP:
- if (len >= 4) {
- TCHECK2(*(p + 2), 2);
- if (EXTRACT_16BITS(p+2) == PPP_LQM)
- printf(" LQR");
- else
- printf(" unknown");
+ if (len < 4) {
+ ND_PRINT(" (length bogus, should be >= 4)");
+ return 0;
}
+ if (GET_BE_U_2(p + 2) == PPP_LQM)
+ ND_PRINT(": LQR");
+ else
+ ND_PRINT(": unknown");
break;
case LCPOPT_MN:
- if (len == 6) {
- TCHECK2(*(p + 2), 4);
- printf("0x%08x", EXTRACT_32BITS(p + 2));
+ if (len != 6) {
+ ND_PRINT(" (length bogus, should be = 6)");
+ return 0;
}
+ ND_PRINT(": 0x%08x", GET_BE_U_4(p + 2));
break;
case LCPOPT_PFC:
break;
case LCPOPT_ACFC:
break;
case LCPOPT_LD:
- if (len == 4) {
- TCHECK2(*(p + 2), 2);
- printf("0x%04x", EXTRACT_16BITS(p + 2));
+ if (len != 4) {
+ ND_PRINT(" (length bogus, should be = 4)");
+ return 0;
}
+ ND_PRINT(": 0x%04x", GET_BE_U_2(p + 2));
break;
case LCPOPT_CBACK:
- if (len < 3)
- break;
- TCHECK(p[2]);
- printf("Callback Operation %s (%u)",
- tok2str(ppp_callback_values,"Unknown",p[2]),
- p[2]);
+ if (len < 3) {
+ ND_PRINT(" (length bogus, should be >= 3)");
+ return 0;
+ }
+ ND_PRINT(": Callback Operation %s (%u)",
+ tok2str(ppp_callback_values, "Unknown", GET_U_1(p + 2)),
+ GET_U_1(p + 2));
break;
case LCPOPT_MLMRRU:
- if (len == 4) {
- TCHECK2(*(p + 2), 2);
- printf("%u", EXTRACT_16BITS(p + 2));
+ if (len != 4) {
+ ND_PRINT(" (length bogus, should be = 4)");
+ return 0;
}
+ ND_PRINT(": %u", GET_BE_U_2(p + 2));
break;
case LCPOPT_MLED:
- if (len < 3)
- break;
- TCHECK(p[2]);
- switch (p[2]) { /* class */
+ if (len < 3) {
+ ND_PRINT(" (length bogus, should be >= 3)");
+ return 0;
+ }
+ switch (GET_U_1(p + 2)) { /* class */
case MEDCLASS_NULL:
- printf("Null");
+ ND_PRINT(": Null");
break;
case MEDCLASS_LOCAL:
- printf("Local"); /* XXX */
+ ND_PRINT(": Local"); /* XXX */
break;
case MEDCLASS_IPV4:
- if (len != 7)
- break;
- TCHECK2(*(p + 3), 4);
- printf("IPv4 %s", ipaddr_string(p + 3));
+ if (len != 7) {
+ ND_PRINT(" (length bogus, should be = 7)");
+ return 0;
+ }
+ ND_PRINT(": IPv4 %s", GET_IPADDR_STRING(p + 3));
break;
case MEDCLASS_MAC:
- if (len != 9)
- break;
- TCHECK(p[8]);
- printf("MAC %02x:%02x:%02x:%02x:%02x:%02x",
- p[3], p[4], p[5], p[6], p[7], p[8]);
+ if (len != 9) {
+ ND_PRINT(" (length bogus, should be = 9)");
+ return 0;
+ }
+ ND_PRINT(": MAC %s", GET_MAC48_STRING(p + 3));
break;
case MEDCLASS_MNB:
- printf("Magic-Num-Block"); /* XXX */
+ ND_PRINT(": Magic-Num-Block"); /* XXX */
break;
case MEDCLASS_PSNDN:
- printf("PSNDN"); /* XXX */
+ ND_PRINT(": PSNDN"); /* XXX */
+ break;
+ default:
+ ND_PRINT(": Unknown class %u", GET_U_1(p + 2));
break;
}
break;
case LCPOPT_PPPMUX:
break;
#endif
- default:
- if(vflag<2)
- print_unknown_data(&p[2],"\n\t ",len-2);
- break;
+ default:
+ /*
+ * Unknown option; dump it as raw bytes now if we're
+ * not going to do so below.
+ */
+ if (ndo->ndo_vflag < 2)
+ print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
+ break;
}
-
- if (vflag>1)
- print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */
+
+ if (ndo->ndo_vflag > 1)
+ print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
return len;
trunc:
- printf("[|lcp]");
+ ND_PRINT("[|lcp]");
return 0;
}
/* ML-PPP*/
-struct tok ppp_ml_flag_values[] = {
+static const struct tok ppp_ml_flag_values[] = {
{ 0x80, "begin" },
{ 0x40, "end" },
{ 0, NULL }
};
static void
-handle_mlppp(const u_char *p, int length) {
+handle_mlppp(netdissect_options *ndo,
+ const u_char *p, u_int length)
+{
+ if (!ndo->ndo_eflag)
+ ND_PRINT("MLPPP, ");
- if (!eflag)
- printf("MLPPP, ");
+ if (length < 2) {
+ ND_PRINT("[|mlppp]");
+ return;
+ }
+ if (!ND_TTEST_2(p)) {
+ ND_PRINT("[|mlppp]");
+ return;
+ }
- printf("seq 0x%03x, Flags [%s], length %u",
- (EXTRACT_16BITS(p))&0x0fff, /* only support 12-Bit sequence space for now */
- bittok2str(ppp_ml_flag_values, "none", *p & 0xc0),
+ ND_PRINT("seq 0x%03x, Flags [%s], length %u",
+ (GET_BE_U_2(p))&0x0fff,
+ /* only support 12-Bit sequence space for now */
+ bittok2str(ppp_ml_flag_values, "none", GET_U_1(p) & 0xc0),
length);
-
- return;
}
/* CHAP */
static void
-handle_chap(const u_char *p, int length)
+handle_chap(netdissect_options *ndo,
+ const u_char *p, u_int length)
{
u_int code, len;
- int val_size, name_size, msg_size;
+ u_int val_size, name_size, msg_size;
const u_char *p0;
- int i;
+ u_int i;
p0 = p;
if (length < 1) {
- printf("[|chap]");
+ ND_PRINT("[|chap]");
return;
} else if (length < 4) {
- TCHECK(*p);
- printf("[|chap 0x%02x]", *p);
+ ND_PRINT("[|chap 0x%02x]", GET_U_1(p));
return;
}
- TCHECK(*p);
- code = *p;
- printf("CHAP, %s (0x%02x)",
+ code = GET_U_1(p);
+ ND_PRINT("CHAP, %s (0x%02x)",
tok2str(chapcode_values,"unknown",code),
code);
p++;
- TCHECK(*p);
- printf(", id %u", *p); /* ID */
+ ND_PRINT(", id %u", GET_U_1(p)); /* ID */
p++;
- TCHECK2(*p, 2);
- len = EXTRACT_16BITS(p);
+ len = GET_BE_U_2(p);
p += 2;
/*
* don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
* MS-CHAPv2) is used at this point, we can't decode packet
* specifically to each algorithms. Instead, we simply decode
- * the GCD (Gratest Common Denominator) for all algorithms.
+ * the GCD (Greatest Common Denominator) for all algorithms.
*/
switch (code) {
case CHAP_CHAL:
case CHAP_RESP:
if (length - (p - p0) < 1)
return;
- TCHECK(*p);
- val_size = *p; /* value size */
+ val_size = GET_U_1(p); /* value size */
p++;
if (length - (p - p0) < val_size)
return;
- printf(", Value ");
+ ND_PRINT(", Value ");
for (i = 0; i < val_size; i++) {
- TCHECK(*p);
- printf("%02x", *p++);
- }
- name_size = len - (p - p0);
- printf(", Name ");
- for (i = 0; i < name_size; i++) {
- TCHECK(*p);
- safeputchar(*p++);
+ ND_PRINT("%02x", GET_U_1(p));
+ p++;
}
+ name_size = len - (u_int)(p - p0);
+ ND_PRINT(", Name ");
+ nd_printjn(ndo, p, name_size);
break;
case CHAP_SUCC:
case CHAP_FAIL:
- msg_size = len - (p - p0);
- printf(", Msg ");
- for (i = 0; i< msg_size; i++) {
- TCHECK(*p);
- safeputchar(*p++);
- }
+ msg_size = len - (u_int)(p - p0);
+ ND_PRINT(", Msg ");
+ nd_printjn(ndo, p, msg_size);
break;
}
- return;
-
-trunc:
- printf("[|chap]");
}
/* PAP (see RFC 1334) */
static void
-handle_pap(const u_char *p, int length)
+handle_pap(netdissect_options *ndo,
+ const u_char *p, u_int length)
{
u_int code, len;
- int peerid_len, passwd_len, msg_len;
+ u_int peerid_len, passwd_len, msg_len;
const u_char *p0;
- int i;
p0 = p;
if (length < 1) {
- printf("[|pap]");
+ ND_PRINT("[|pap]");
return;
} else if (length < 4) {
- TCHECK(*p);
- printf("[|pap 0x%02x]", *p);
+ ND_PRINT("[|pap 0x%02x]", GET_U_1(p));
return;
}
- TCHECK(*p);
- code = *p;
- printf("PAP, %s (0x%02x)",
- tok2str(papcode_values,"unknown",code),
- code);
+ code = GET_U_1(p);
+ ND_PRINT("PAP, %s (0x%02x)",
+ tok2str(papcode_values, "unknown", code),
+ code);
p++;
- TCHECK(*p);
- printf(", id %u", *p); /* ID */
+ ND_PRINT(", id %u", GET_U_1(p)); /* ID */
p++;
- TCHECK2(*p, 2);
- len = EXTRACT_16BITS(p);
+ len = GET_BE_U_2(p);
p += 2;
- if ((int)len > length) {
- printf(", length %u > packet size", len);
+ if (len > length) {
+ ND_PRINT(", length %u > packet size", len);
return;
}
length = len;
- if (length < (p - p0)) {
- printf(", length %u < PAP header length", length);
+ if (length < (size_t)(p - p0)) {
+ ND_PRINT(", length %u < PAP header length", length);
return;
}
switch (code) {
case PAP_AREQ:
+ /* A valid Authenticate-Request is 6 or more octets long. */
+ if (len < 6)
+ goto trunc;
if (length - (p - p0) < 1)
return;
- TCHECK(*p);
- peerid_len = *p; /* Peer-ID Length */
+ peerid_len = GET_U_1(p); /* Peer-ID Length */
p++;
if (length - (p - p0) < peerid_len)
return;
- printf(", Peer ");
- for (i = 0; i < peerid_len; i++) {
- TCHECK(*p);
- safeputchar(*p++);
- }
+ ND_PRINT(", Peer ");
+ nd_printjn(ndo, p, peerid_len);
+ p += peerid_len;
if (length - (p - p0) < 1)
return;
- TCHECK(*p);
- passwd_len = *p; /* Password Length */
+ passwd_len = GET_U_1(p); /* Password Length */
p++;
if (length - (p - p0) < passwd_len)
return;
- printf(", Name ");
- for (i = 0; i < passwd_len; i++) {
- TCHECK(*p);
- safeputchar(*p++);
- }
+ ND_PRINT(", Name ");
+ nd_printjn(ndo, p, passwd_len);
break;
case PAP_AACK:
case PAP_ANAK:
+ /* Although some implementations ignore truncation at
+ * this point and at least one generates a truncated
+ * packet, RFC 1334 section 2.2.2 clearly states that
+ * both AACK and ANAK are at least 5 bytes long.
+ */
+ if (len < 5)
+ goto trunc;
if (length - (p - p0) < 1)
return;
- TCHECK(*p);
- msg_len = *p; /* Msg-Length */
+ msg_len = GET_U_1(p); /* Msg-Length */
p++;
if (length - (p - p0) < msg_len)
return;
- printf(", Msg ");
- for (i = 0; i< msg_len; i++) {
- TCHECK(*p);
- safeputchar(*p++);
- }
+ ND_PRINT(", Msg ");
+ nd_printjn(ndo, p, msg_len);
break;
}
return;
trunc:
- printf("[|pap]");
+ ND_PRINT("[|pap]");
}
/* BAP */
static void
-handle_bap(const u_char *p _U_, int length _U_)
+handle_bap(netdissect_options *ndo _U_,
+ const u_char *p _U_, u_int length _U_)
{
/* XXX: to be supported!! */
}
/* IPCP config options */
-static int
-print_ipcp_config_options(const u_char *p, int length)
+static u_int
+print_ipcp_config_options(netdissect_options *ndo,
+ const u_char *p, u_int length)
{
- int len, opt;
+ u_int opt, len;
+ u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen;
if (length < 2)
return 0;
- TCHECK2(*p, 2);
- len = p[1];
- opt = p[0];
+ ND_TCHECK_2(p);
+ opt = GET_U_1(p);
+ len = GET_U_1(p + 1);
if (length < len)
return 0;
if (len < 2) {
- printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
+ ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
tok2str(ipcpopt_values,"unknown",opt),
opt,
- len);
+ len);
return 0;
}
- printf("\n\t %s Option (0x%02x), length %u: ",
+ ND_PRINT("\n\t %s Option (0x%02x), length %u",
tok2str(ipcpopt_values,"unknown",opt),
opt,
- len);
+ len);
switch (opt) {
case IPCPOPT_2ADDR: /* deprecated */
- if (len != 10)
- goto invlen;
- TCHECK2(*(p + 6), 4);
- printf("src %s, dst %s",
- ipaddr_string(p + 2),
- ipaddr_string(p + 6));
+ if (len != 10) {
+ ND_PRINT(" (length bogus, should be = 10)");
+ return len;
+ }
+ ND_PRINT(": src %s, dst %s",
+ GET_IPADDR_STRING(p + 2),
+ GET_IPADDR_STRING(p + 6));
break;
case IPCPOPT_IPCOMP:
- if (len < 4)
- goto invlen;
- TCHECK2(*(p + 2), 2);
- if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
- printf("VJ-Comp");
+ if (len < 4) {
+ ND_PRINT(" (length bogus, should be >= 4)");
+ return 0;
+ }
+ compproto = GET_BE_U_2(p + 2);
+
+ ND_PRINT(": %s (0x%02x):",
+ tok2str(ipcpopt_compproto_values, "Unknown", compproto),
+ compproto);
+
+ switch (compproto) {
+ case PPP_VJC:
/* XXX: VJ-Comp parameters should be decoded */
- } else
- printf("unknown-comp-proto %04x", EXTRACT_16BITS(p + 2));
+ break;
+ case IPCPOPT_IPCOMP_HDRCOMP:
+ if (len < IPCPOPT_IPCOMP_MINLEN) {
+ ND_PRINT(" (length bogus, should be >= %u)",
+ IPCPOPT_IPCOMP_MINLEN);
+ return 0;
+ }
+
+ ND_TCHECK_LEN(p + 2, IPCPOPT_IPCOMP_MINLEN);
+ ND_PRINT("\n\t TCP Space %u, non-TCP Space %u"
+ ", maxPeriod %u, maxTime %u, maxHdr %u",
+ GET_BE_U_2(p + 4),
+ GET_BE_U_2(p + 6),
+ GET_BE_U_2(p + 8),
+ GET_BE_U_2(p + 10),
+ GET_BE_U_2(p + 12));
+
+ /* suboptions present ? */
+ if (len > IPCPOPT_IPCOMP_MINLEN) {
+ ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN;
+ p += IPCPOPT_IPCOMP_MINLEN;
+
+ ND_PRINT("\n\t Suboptions, length %u", ipcomp_subopttotallen);
+
+ while (ipcomp_subopttotallen >= 2) {
+ ND_TCHECK_2(p);
+ ipcomp_subopt = GET_U_1(p);
+ ipcomp_suboptlen = GET_U_1(p + 1);
+
+ /* sanity check */
+ if (ipcomp_subopt == 0 ||
+ ipcomp_suboptlen == 0 )
+ break;
+
+ /* XXX: just display the suboptions for now */
+ ND_PRINT("\n\t\t%s Suboption #%u, length %u",
+ tok2str(ipcpopt_compproto_subopt_values,
+ "Unknown",
+ ipcomp_subopt),
+ ipcomp_subopt,
+ ipcomp_suboptlen);
+ if (ipcomp_subopttotallen < ipcomp_suboptlen) {
+ ND_PRINT(" [remaining suboptions length %u < %u]",
+ ipcomp_subopttotallen, ipcomp_suboptlen);
+ nd_print_invalid(ndo);
+ break;
+ }
+ ipcomp_subopttotallen -= ipcomp_suboptlen;
+ p += ipcomp_suboptlen;
+ }
+ }
+ break;
+ default:
+ break;
+ }
break;
case IPCPOPT_ADDR: /* those options share the same format - fall through */
case IPCPOPT_PRINBNS:
case IPCPOPT_SECDNS:
case IPCPOPT_SECNBNS:
- if (len != 6)
- goto invlen;
- TCHECK2(*(p + 2), 4);
- printf("%s", ipaddr_string(p + 2));
+ if (len != 6) {
+ ND_PRINT(" (length bogus, should be = 6)");
+ return 0;
+ }
+ ND_PRINT(": %s", GET_IPADDR_STRING(p + 2));
break;
default:
- if(vflag<2)
- print_unknown_data(&p[2],"\n\t ",len-2);
+ /*
+ * Unknown option; dump it as raw bytes now if we're
+ * not going to do so below.
+ */
+ if (ndo->ndo_vflag < 2)
+ print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
break;
}
- if (vflag>1)
- print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */
+ if (ndo->ndo_vflag > 1 && ND_TTEST_LEN(p + 2, len - 2))
+ print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
return len;
-invlen:
- printf(", invalid-length-%d", opt);
- return 0;
-
trunc:
- printf("[|ipcp]");
+ ND_PRINT("[|ipcp]");
return 0;
}
/* IP6CP config options */
-static int
-print_ip6cp_config_options(const u_char *p, int length)
+static u_int
+print_ip6cp_config_options(netdissect_options *ndo,
+ const u_char *p, u_int length)
{
- int len, opt;
+ u_int opt, len;
if (length < 2)
return 0;
- TCHECK2(*p, 2);
- len = p[1];
- opt = p[0];
+ ND_TCHECK_2(p);
+ opt = GET_U_1(p);
+ len = GET_U_1(p + 1);
if (length < len)
return 0;
if (len < 2) {
- printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
+ ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
tok2str(ip6cpopt_values,"unknown",opt),
opt,
- len);
- return 0;
+ len);
+ return 0;
}
- printf("\n\t %s Option (0x%02x), length %u: ",
+ ND_PRINT("\n\t %s Option (0x%02x), length %u",
tok2str(ip6cpopt_values,"unknown",opt),
opt,
- len);
+ len);
switch (opt) {
case IP6CP_IFID:
- if (len != 10)
- goto invlen;
- TCHECK2(*(p + 2), 8);
- printf("%04x:%04x:%04x:%04x",
- EXTRACT_16BITS(p + 2),
- EXTRACT_16BITS(p + 4),
- EXTRACT_16BITS(p + 6),
- EXTRACT_16BITS(p + 8));
+ if (len != 10) {
+ ND_PRINT(" (length bogus, should be = 10)");
+ return len;
+ }
+ ND_TCHECK_8(p + 2);
+ ND_PRINT(": %04x:%04x:%04x:%04x",
+ GET_BE_U_2(p + 2),
+ GET_BE_U_2(p + 4),
+ GET_BE_U_2(p + 6),
+ GET_BE_U_2(p + 8));
break;
default:
- if(vflag<2)
- print_unknown_data(&p[2],"\n\t ",len-2);
+ /*
+ * Unknown option; dump it as raw bytes now if we're
+ * not going to do so below.
+ */
+ if (ndo->ndo_vflag < 2)
+ print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
break;
}
- if (vflag>1)
- print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */
+ if (ndo->ndo_vflag > 1)
+ print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
return len;
-invlen:
- printf(", invalid-length-%d", opt);
- return 0;
-
trunc:
- printf("[|ip6cp]");
+ ND_PRINT("[|ip6cp]");
return 0;
}
/* CCP config options */
-static int
-print_ccp_config_options(const u_char *p, int length)
+static u_int
+print_ccp_config_options(netdissect_options *ndo,
+ const u_char *p, u_int length)
{
- int len, opt;
+ u_int opt, len;
if (length < 2)
return 0;
- TCHECK2(*p, 2);
- len = p[1];
- opt = p[0];
+ ND_TCHECK_2(p);
+ opt = GET_U_1(p);
+ len = GET_U_1(p + 1);
if (length < len)
return 0;
if (len < 2) {
- printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
- tok2str(ccpconfopts_values, "Unknown", opt),
- opt,
- len);
- return 0;
- }
+ ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
+ tok2str(ccpconfopts_values, "Unknown", opt),
+ opt,
+ len);
+ return 0;
+ }
- printf("\n\t %s Option (0x%02x), length %u:",
- tok2str(ccpconfopts_values, "Unknown", opt),
- opt,
- len);
+ ND_PRINT("\n\t %s Option (0x%02x), length %u",
+ tok2str(ccpconfopts_values, "Unknown", opt),
+ opt,
+ len);
switch (opt) {
- /* fall through --> default: nothing supported yet */
+ case CCPOPT_BSDCOMP:
+ if (len < 3) {
+ ND_PRINT(" (length bogus, should be >= 3)");
+ return len;
+ }
+ ND_PRINT(": Version: %u, Dictionary Bits: %u",
+ GET_U_1(p + 2) >> 5,
+ GET_U_1(p + 2) & 0x1f);
+ break;
+ case CCPOPT_MVRCA:
+ if (len < 4) {
+ ND_PRINT(" (length bogus, should be >= 4)");
+ return len;
+ }
+ ND_PRINT(": Features: %u, PxP: %s, History: %u, #CTX-ID: %u",
+ (GET_U_1(p + 2) & 0xc0) >> 6,
+ (GET_U_1(p + 2) & 0x20) ? "Enabled" : "Disabled",
+ GET_U_1(p + 2) & 0x1f,
+ GET_U_1(p + 3));
+ break;
+ case CCPOPT_DEFLATE:
+ if (len < 4) {
+ ND_PRINT(" (length bogus, should be >= 4)");
+ return len;
+ }
+ ND_PRINT(": Window: %uK, Method: %s (0x%x), MBZ: %u, CHK: %u",
+ (GET_U_1(p + 2) & 0xf0) >> 4,
+ ((GET_U_1(p + 2) & 0x0f) == 8) ? "zlib" : "unknown",
+ GET_U_1(p + 2) & 0x0f,
+ (GET_U_1(p + 3) & 0xfc) >> 2,
+ GET_U_1(p + 3) & 0x03);
+ break;
+
+/* XXX: to be supported */
+#if 0
case CCPOPT_OUI:
case CCPOPT_PRED1:
case CCPOPT_PRED2:
case CCPOPT_MPPC:
case CCPOPT_GFZA:
case CCPOPT_V42BIS:
- case CCPOPT_BSDCOMP:
case CCPOPT_LZSDCP:
- case CCPOPT_MVRCA:
case CCPOPT_DEC:
- case CCPOPT_DEFLATE:
case CCPOPT_RESV:
+ break;
+#endif
default:
- if(vflag<2)
- print_unknown_data(&p[2],"\n\t ",len-2);
+ /*
+ * Unknown option; dump it as raw bytes now if we're
+ * not going to do so below.
+ */
+ if (ndo->ndo_vflag < 2)
+ print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
break;
}
- if (vflag>1)
- print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */
+ if (ndo->ndo_vflag > 1)
+ print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
return len;
trunc:
- printf("[|ccp]");
+ ND_PRINT("[|ccp]");
return 0;
}
/* BACP config options */
-static int
-print_bacp_config_options(const u_char *p, int length)
+static u_int
+print_bacp_config_options(netdissect_options *ndo,
+ const u_char *p, u_int length)
{
- int len, opt;
+ u_int opt, len;
if (length < 2)
return 0;
- TCHECK2(*p, 2);
- len = p[1];
- opt = p[0];
+ ND_TCHECK_2(p);
+ opt = GET_U_1(p);
+ len = GET_U_1(p + 1);
if (length < len)
return 0;
if (len < 2) {
- printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
- tok2str(bacconfopts_values, "Unknown", opt),
- opt,
- len);
- return 0;
- }
+ ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
+ tok2str(bacconfopts_values, "Unknown", opt),
+ opt,
+ len);
+ return 0;
+ }
- printf("\n\t %s Option (0x%02x), length %u:",
- tok2str(bacconfopts_values, "Unknown", opt),
- opt,
- len);
+ ND_PRINT("\n\t %s Option (0x%02x), length %u",
+ tok2str(bacconfopts_values, "Unknown", opt),
+ opt,
+ len);
switch (opt) {
case BACPOPT_FPEER:
- TCHECK2(*(p + 2), 4);
- printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2));
- break;
+ if (len != 6) {
+ ND_PRINT(" (length bogus, should be = 6)");
+ return len;
+ }
+ ND_PRINT(": Magic-Num 0x%08x", GET_BE_U_4(p + 2));
+ break;
default:
- if(vflag<2)
- print_unknown_data(&p[2],"\n\t ",len-2);
+ /*
+ * Unknown option; dump it as raw bytes now if we're
+ * not going to do so below.
+ */
+ if (ndo->ndo_vflag < 2)
+ print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
break;
}
- if (vflag>1)
- print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */
+ if (ndo->ndo_vflag > 1)
+ print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
return len;
trunc:
- printf("[|bacp]");
+ ND_PRINT("[|bacp]");
return 0;
}
-
+/*
+ * Un-escape RFC 1662 PPP in HDLC-like framing, with octet escapes.
+ * The length argument is the on-the-wire length, not the captured
+ * length; we can only un-escape the captured part.
+ */
static void
-ppp_hdlc(const u_char *p, int length)
+ppp_hdlc(netdissect_options *ndo,
+ const u_char *p, u_int length)
{
- u_char *b, *s, *t, c;
- int i, proto;
- const void *se;
+ u_int caplen = ND_BYTES_AVAILABLE_AFTER(p);
+ u_char *b, *t, c;
+ const u_char *s;
+ u_int i, proto;
- b = (u_int8_t *)malloc(length);
- if (b == NULL)
+ if (caplen == 0)
return;
+ if (length == 0)
+ return;
+
+ b = (u_char *)malloc(caplen);
+ if (b == NULL) {
+ (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
+ "%s: malloc", __func__);
+ }
+
/*
* Unescape all the data into a temporary, private, buffer.
- * Do this so that we dont overwrite the original packet
+ * Do this so that we don't overwrite the original packet
* contents.
*/
- for (s = (u_char *)p, t = b, i = length; i > 0; i--) {
- c = *s++;
+ for (s = p, t = b, i = caplen; i != 0; i--) {
+ c = GET_U_1(s);
+ s++;
if (c == 0x7d) {
- if (i > 1) {
- i--;
- c = *s++ ^ 0x20;
- } else
- continue;
+ if (i <= 1)
+ break;
+ i--;
+ c = GET_U_1(s) ^ 0x20;
+ s++;
}
*t++ = c;
}
- se = snapend;
- snapend = t;
+ /*
+ * Switch to the output buffer for dissection, and save it
+ * on the buffer stack so it can be freed; our caller must
+ * pop it when done.
+ */
+ if (!nd_push_buffer(ndo, b, b, (u_int)(t - b))) {
+ free(b);
+ (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
+ "%s: can't push buffer on buffer stack", __func__);
+ }
+ length = ND_BYTES_AVAILABLE_AFTER(b);
/* now lets guess about the payload codepoint format */
- proto = *b; /* start with a one-octet codepoint guess */
-
+ if (length < 1)
+ goto trunc;
+ proto = GET_U_1(b); /* start with a one-octet codepoint guess */
+
switch (proto) {
case PPP_IP:
- ip_print(gndo, b+1, t - b - 1);
+ ip_print(ndo, b + 1, length - 1);
goto cleanup;
-#ifdef INET6
case PPP_IPV6:
- ip6_print(b+1, t - b - 1);
- goto cleanup;
-#endif
+ ip6_print(ndo, b + 1, length - 1);
+ goto cleanup;
default: /* no luck - try next guess */
- break;
+ break;
}
- proto = EXTRACT_16BITS(b); /* next guess - load two octets */
+ if (length < 2)
+ goto trunc;
+ proto = GET_BE_U_2(b); /* next guess - load two octets */
switch (proto) {
case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */
- proto = EXTRACT_16BITS(b+2); /* load the PPP proto-id */
- handle_ppp(proto, b+4, t - b - 4);
+ if (length < 4)
+ goto trunc;
+ proto = GET_BE_U_2(b + 2); /* load the PPP proto-id */
+ if ((proto & 0xff00) == 0x7e00)
+ ND_PRINT("(protocol 0x%04x invalid)", proto);
+ else
+ handle_ppp(ndo, proto, b + 4, length - 4);
break;
default: /* last guess - proto must be a PPP proto-id */
- handle_ppp(proto, b+2, t - b - 2);
+ if ((proto & 0xff00) == 0x7e00)
+ ND_PRINT("(protocol 0x%04x invalid)", proto);
+ else
+ handle_ppp(ndo, proto, b + 2, length - 2);
break;
}
cleanup:
- snapend = se;
- free(b);
+ nd_pop_packet_info(ndo);
return;
+
+trunc:
+ nd_pop_packet_info(ndo);
+ nd_print_trunc(ndo);
}
/* PPP */
static void
-handle_ppp(u_int proto, const u_char *p, int length)
+handle_ppp(netdissect_options *ndo,
+ u_int proto, const u_char *p, u_int length)
{
- if ((proto & 0xff00) == 0x7e00) {/* is this an escape code ? */
- ppp_hdlc(p-1, length);
- return;
- }
+ if ((proto & 0xff00) == 0x7e00) { /* is this an escape code ? */
+ ppp_hdlc(ndo, p - 1, length);
+ return;
+ }
switch (proto) {
case PPP_LCP: /* fall through */
case PPP_IPV6CP:
case PPP_CCP:
case PPP_BACP:
- handle_ctrl_proto(proto, p, length);
+ handle_ctrl_proto(ndo, proto, p, length);
+ break;
+ case PPP_ML:
+ handle_mlppp(ndo, p, length);
break;
- case PPP_ML:
- handle_mlppp(p, length);
- break;
case PPP_CHAP:
- handle_chap(p, length);
+ handle_chap(ndo, p, length);
break;
case PPP_PAP:
- handle_pap(p, length);
+ handle_pap(ndo, p, length);
break;
case PPP_BAP: /* XXX: not yet completed */
- handle_bap(p, length);
+ handle_bap(ndo, p, length);
break;
case ETHERTYPE_IP: /*XXX*/
case PPP_VJNC:
case PPP_IP:
- ip_print(gndo, p, length);
+ ip_print(ndo, p, length);
break;
-#ifdef INET6
case ETHERTYPE_IPV6: /*XXX*/
case PPP_IPV6:
- ip6_print(p, length);
+ ip6_print(ndo, p, length);
break;
-#endif
case ETHERTYPE_IPX: /*XXX*/
case PPP_IPX:
- ipx_print(p, length);
+ ipx_print(ndo, p, length);
break;
case PPP_OSI:
- isoclns_print(p, length, length);
- break;
+ isoclns_print(ndo, p, length);
+ break;
case PPP_MPLS_UCAST:
case PPP_MPLS_MCAST:
- mpls_print(p, length);
+ mpls_print(ndo, p, length);
break;
case PPP_COMP:
- printf("compressed PPP data");
+ ND_PRINT("compressed PPP data");
break;
default:
- printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
- print_unknown_data(p,"\n\t",length);
+ ND_PRINT("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
+ print_unknown_data(ndo, p, "\n\t", length);
break;
}
}
/* Standard PPP printer */
u_int
-ppp_print(register const u_char *p, u_int length)
+ppp_print(netdissect_options *ndo,
+ const u_char *p, u_int length)
{
u_int proto,ppp_header;
u_int olen = length; /* _o_riginal length */
u_int hdr_len = 0;
+ ndo->ndo_protocol = "ppp";
/*
* Here, we assume that p points to the Address and Control
* field (if they present).
*/
if (length < 2)
goto trunc;
- TCHECK2(*p, 2);
- ppp_header = EXTRACT_16BITS(p);
+ ppp_header = GET_BE_U_2(p);
switch(ppp_header) {
- case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL):
- if (eflag) printf("In ");
+ case (PPP_PPPD_IN << 8 | PPP_CONTROL):
+ if (ndo->ndo_eflag) ND_PRINT("In ");
p += 2;
length -= 2;
hdr_len += 2;
break;
- case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL):
- if (eflag) printf("Out ");
+ case (PPP_PPPD_OUT << 8 | PPP_CONTROL):
+ if (ndo->ndo_eflag) ND_PRINT("Out ");
p += 2;
length -= 2;
hdr_len += 2;
if (length < 2)
goto trunc;
- TCHECK(*p);
- if (*p % 2) {
- proto = *p; /* PFC is used */
+ if (GET_U_1(p) % 2) {
+ proto = GET_U_1(p); /* PFC is used */
p++;
length--;
hdr_len++;
} else {
- TCHECK2(*p, 2);
- proto = EXTRACT_16BITS(p);
+ proto = GET_BE_U_2(p);
p += 2;
length -= 2;
hdr_len += 2;
}
- if (eflag)
- printf("%s (0x%04x), length %u: ",
- tok2str(ppptype2str, "unknown", proto),
- proto,
- olen);
+ if (ndo->ndo_eflag) {
+ const char *typestr;
+ typestr = tok2str(ppptype2str, "unknown", proto);
+ ND_PRINT("%s (0x%04x), length %u",
+ typestr,
+ proto,
+ olen);
+ if (*typestr == 'u') /* "unknown" */
+ return hdr_len;
+
+ ND_PRINT(": ");
+ }
- handle_ppp(proto, p, length);
+ handle_ppp(ndo, proto, p, length);
return (hdr_len);
trunc:
- printf("[|ppp]");
+ nd_print_trunc(ndo);
return (0);
}
/* PPP I/F printer */
-u_int
-ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p)
+void
+ppp_if_print(netdissect_options *ndo,
+ const struct pcap_pkthdr *h, const u_char *p)
{
- register u_int length = h->len;
- register u_int caplen = h->caplen;
+ u_int length = h->len;
+ u_int caplen = h->caplen;
+ ndo->ndo_protocol = "ppp";
if (caplen < PPP_HDRLEN) {
- printf("[|ppp]");
- return (caplen);
+ nd_print_trunc(ndo);
+ ndo->ndo_ll_hdr_len += caplen;
+ return;
}
+ ndo->ndo_ll_hdr_len += PPP_HDRLEN;
#if 0
/*
* (Is the Cisco framing in question what DLT_C_HDLC, in
* BSD/OS, is?)
*/
- if (eflag)
- printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]);
+ if (ndo->ndo_eflag)
+ ND_PRINT("%c %4d %02x ", GET_U_1(p) ? 'O' : 'I',
+ length, GET_U_1(p + 1));
#endif
- ppp_print(p, length);
-
- return (0);
+ ppp_print(ndo, p, length);
}
/*
*
* This handles, for example, DLT_PPP_SERIAL in NetBSD.
*/
-u_int
-ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
+void
+ppp_hdlc_if_print(netdissect_options *ndo,
+ const struct pcap_pkthdr *h, const u_char *p)
{
- register u_int length = h->len;
- register u_int caplen = h->caplen;
+ u_int length = h->len;
+ u_int caplen = h->caplen;
u_int proto;
u_int hdrlen = 0;
+ ndo->ndo_protocol = "ppp_hdlc";
if (caplen < 2) {
- printf("[|ppp]");
- return (caplen);
+ nd_print_trunc(ndo);
+ ndo->ndo_ll_hdr_len += caplen;
+ return;
}
- switch (p[0]) {
+ switch (GET_U_1(p)) {
case PPP_ADDRESS:
if (caplen < 4) {
- printf("[|ppp]");
- return (caplen);
+ nd_print_trunc(ndo);
+ ndo->ndo_ll_hdr_len += caplen;
+ return;
}
- if (eflag)
- printf("%02x %02x %d ", p[0], p[1], length);
+ if (ndo->ndo_eflag)
+ ND_PRINT("%02x %02x %u ", GET_U_1(p),
+ GET_U_1(p + 1), length);
p += 2;
length -= 2;
hdrlen += 2;
- proto = EXTRACT_16BITS(p);
+ proto = GET_BE_U_2(p);
p += 2;
length -= 2;
hdrlen += 2;
- printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
+ ND_PRINT("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
- handle_ppp(proto, p, length);
+ handle_ppp(ndo, proto, p, length);
break;
case CHDLC_UNICAST:
case CHDLC_BCAST:
- return (chdlc_if_print(h, p));
+ chdlc_if_print(ndo, h, p);
+ return;
default:
- if (eflag)
- printf("%02x %02x %d ", p[0], p[1], length);
+ if (caplen < 4) {
+ nd_print_trunc(ndo);
+ ndo->ndo_ll_hdr_len += caplen;
+ return;
+ }
+
+ if (ndo->ndo_eflag)
+ ND_PRINT("%02x %02x %u ", GET_U_1(p),
+ GET_U_1(p + 1), length);
p += 2;
- length -= 2;
hdrlen += 2;
/*
* the next two octets as an Ethernet type; does that
* ever happen?
*/
- printf("unknown addr %02x; ctrl %02x", p[0], p[1]);
+ ND_PRINT("unknown addr %02x; ctrl %02x", GET_U_1(p),
+ GET_U_1(p + 1));
break;
}
- return (hdrlen);
+ ndo->ndo_ll_hdr_len += hdrlen;
}
-
-#define PPP_BSDI_HDRLEN 24
-
-/* BSD/OS specific PPP printer */
-u_int
-ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_)
-{
- register int hdrlength;
-#ifdef __bsdi__
- register u_int length = h->len;
- register u_int caplen = h->caplen;
- u_int16_t ptype;
- const u_char *q;
- int i;
-
- if (caplen < PPP_BSDI_HDRLEN) {
- printf("[|ppp]");
- return (caplen)
- }
-
- hdrlength = 0;
-
-#if 0
- if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
- if (eflag)
- printf("%02x %02x ", p[0], p[1]);
- p += 2;
- hdrlength = 2;
- }
-
- if (eflag)
- printf("%d ", length);
- /* Retrieve the protocol type */
- if (*p & 01) {
- /* Compressed protocol field */
- ptype = *p;
- if (eflag)
- printf("%02x ", ptype);
- p++;
- hdrlength += 1;
- } else {
- /* Un-compressed protocol field */
- ptype = ntohs(*(u_int16_t *)p);
- if (eflag)
- printf("%04x ", ptype);
- p += 2;
- hdrlength += 2;
- }
-#else
- ptype = 0; /*XXX*/
- if (eflag)
- printf("%c ", p[SLC_DIR] ? 'O' : 'I');
- if (p[SLC_LLHL]) {
- /* link level header */
- struct ppp_header *ph;
-
- q = p + SLC_BPFHDRLEN;
- ph = (struct ppp_header *)q;
- if (ph->phdr_addr == PPP_ADDRESS
- && ph->phdr_ctl == PPP_CONTROL) {
- if (eflag)
- printf("%02x %02x ", q[0], q[1]);
- ptype = ntohs(ph->phdr_type);
- if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
- printf("%s ", tok2str(ppptype2str,
- "proto-#%d", ptype));
- }
- } else {
- if (eflag) {
- printf("LLH=[");
- for (i = 0; i < p[SLC_LLHL]; i++)
- printf("%02x", q[i]);
- printf("] ");
- }
- }
- }
- if (eflag)
- printf("%d ", length);
- if (p[SLC_CHL]) {
- q = p + SLC_BPFHDRLEN + p[SLC_LLHL];
-
- switch (ptype) {
- case PPP_VJC:
- ptype = vjc_print(q, ptype);
- hdrlength = PPP_BSDI_HDRLEN;
- p += hdrlength;
- switch (ptype) {
- case PPP_IP:
- ip_print(p, length);
- break;
-#ifdef INET6
- case PPP_IPV6:
- ip6_print(p, length);
- break;
-#endif
- case PPP_MPLS_UCAST:
- case PPP_MPLS_MCAST:
- mpls_print(p, length);
- break;
- }
- goto printx;
- case PPP_VJNC:
- ptype = vjc_print(q, ptype);
- hdrlength = PPP_BSDI_HDRLEN;
- p += hdrlength;
- switch (ptype) {
- case PPP_IP:
- ip_print(p, length);
- break;
-#ifdef INET6
- case PPP_IPV6:
- ip6_print(p, length);
- break;
-#endif
- case PPP_MPLS_UCAST:
- case PPP_MPLS_MCAST:
- mpls_print(p, length);
- break;
- }
- goto printx;
- default:
- if (eflag) {
- printf("CH=[");
- for (i = 0; i < p[SLC_LLHL]; i++)
- printf("%02x", q[i]);
- printf("] ");
- }
- break;
- }
- }
-
- hdrlength = PPP_BSDI_HDRLEN;
-#endif
-
- length -= hdrlength;
- p += hdrlength;
-
- switch (ptype) {
- case PPP_IP:
- ip_print(p, length);
- break;
-#ifdef INET6
- case PPP_IPV6:
- ip6_print(p, length);
- break;
-#endif
- case PPP_MPLS_UCAST:
- case PPP_MPLS_MCAST:
- mpls_print(p, length);
- break;
- default:
- printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
- }
-
-printx:
-#else /* __bsdi */
- hdrlength = 0;
-#endif /* __bsdi__ */
- return (hdrlength);
-}
-
-
-/*
- * Local Variables:
- * c-style: whitesmith
- * c-basic-offset: 8
- * End:
- */
projects / tcpdump / blobdiff