* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * complete PPP support.
+ */
+
+/*
+ * TODO:
+ * o resolve XXX as much as possible
+ * o MP support
+ * o BAP support
*/
#ifndef lint
static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.26 1999-10-07 23:47:12 mcr Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.57 2000-12-04 06:47:18 guy Exp $ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
-#include <sys/socket.h>
-#include <sys/file.h>
-#include <sys/ioctl.h>
-#if __STDC__
-struct mbuf;
-struct rtentry;
+#ifdef __bsdi__
+#include <net/slcompress.h>
+#include <net/if_ppp.h>
#endif
-#include <net/if.h>
#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
#include <ctype.h>
#include <netdb.h>
#include <stdio.h>
#include "interface.h"
+#include "extract.h"
#include "addrtoname.h"
#include "ppp.h"
+#include "chdlc.h"
+#include "ethertype.h"
+
+/*
+ * The following constatns are defined by IANA. Please refer to
+ * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers
+ * for the up-to-date information.
+ */
+
+/* Control Protocols (LCP/IPCP/CCP etc.) Codes */
+
+#define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */
+#define CPCODES_CONF_REQ 1 /* Configure-Request */
+#define CPCODES_CONF_ACK 2 /* Configure-Ack */
+#define CPCODES_CONF_NAK 3 /* Configure-Nak */
+#define CPCODES_CONF_REJ 4 /* Configure-Reject */
+#define CPCODES_TERM_REQ 5 /* Terminate-Request */
+#define CPCODES_TERM_ACK 6 /* Terminate-Ack */
+#define CPCODES_CODE_REJ 7 /* Code-Reject */
+#define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */
+#define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */
+#define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */
+#define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */
+#define CPCODES_ID 12 /* Identification (LCP only) */
+#define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) */
+#define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) */
+#define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */
+
+#define CPCODES_MIN CPCODES_VEXT
+#define CPCODES_MAX CPCODES_RESET_REP
+
+static const char *cpcodes[] = {
+ /*
+ * Control Protocol code values (RFC1661)
+ */
+ "Vend-Ext", /* (0) RFC2153 */
+ "Conf-Req", /* (1) */
+ "Conf-Ack", /* (2) */
+ "Conf-Nak", /* (3) */
+ "Conf-Rej", /* (4) */
+ "Term-Req", /* (5) */
+ "Term-Ack", /* (6) */
+ "Code-Rej", /* (7) */
+ "Prot-Rej", /* (8) */
+ "Echo-Req", /* (9) */
+ "Echo-Rep", /* (10) */
+ "Disc-Req", /* (11) */
+ "Ident", /* (12) RFC1570 */
+ "Time-Rem", /* (13) RFC1570 */
+ "Reset-Req", /* (14) RFC1962 */
+ "Reset-Ack", /* (15) RFC1962 */
+};
+
+/* LCP Config Options */
+
+#define LCPOPT_VEXT 0
+#define LCPOPT_MRU 1
+#define LCPOPT_ACCM 2
+#define LCPOPT_AP 3
+#define LCPOPT_QP 4
+#define LCPOPT_MN 5
+#define LCPOPT_DEP6 6
+#define LCPOPT_PFC 7
+#define LCPOPT_ACFC 8
+#define LCPOPT_FCSALT 9
+#define LCPOPT_SDP 10
+#define LCPOPT_NUMMODE 11
+#define LCPOPT_DEP12 12
+#define LCPOPT_CBACK 13
+#define LCPOPT_DEP14 14
+#define LCPOPT_DEP15 15
+#define LCPOPT_DEP16 16
+#define LCPOPT_MLMRRU 17
+#define LCPOPT_MLSSNHF 18
+#define LCPOPT_MLED 19
+#define LCPOPT_PROP 20
+#define LCPOPT_DCEID 21
+#define LCPOPT_MPP 22
+#define LCPOPT_LD 23
+#define LCPOPT_LCPAOPT 24
+#define LCPOPT_COBS 25
+#define LCPOPT_PE 26
+#define LCPOPT_MLHF 27
+#define LCPOPT_I18N 28
+#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) */
+ "ACCM", /* (2) */
+ "Auth-Prot", /* (3) */
+ "Qual-Prot", /* (4) */
+ "Magic-Num", /* (5) */
+ "deprecated(6)", /* used to be a Quality Protocol */
+ "PFC", /* (7) */
+ "ACFC", /* (8) */
+ "FCS-Alt", /* (9) */
+ "SDP", /* (10) */
+ "Num-Mode", /* (11) */
+ "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(16)", /* used to be a Nominal-Data-Encap */
+ "MRRU", /* (17) */
+ "SSNHF", /* (18) */
+ "End-Disc", /* (19) */
+ "Proprietary", /* (20) */
+ "DCE-Id", /* (21) */
+ "MP+", /* (22) */
+ "Link-Disc", /* (23) */
+ "LCP-Auth-Opt", /* (24) */
+ "COBS", /* (25) */
+ "Prefix-elision", /* (26) */
+ "Multilink-header-Form",/* (27) */
+ "I18N", /* (28) */
+ "SDL-over-SONET/SDH", /* (29) */
+ "PPP-Muxing", /* (30) */
+};
+
+/* IPV6CP - to be supported */
+/* ECP - to be supported */
+
+/* CCP Config Options */
+
+#define CCPOPT_OUI 0 /* RFC1962 */
+#define CCPOPT_PRED1 1 /* RFC1962 */
+#define CCPOPT_PRED2 2 /* RFC1962 */
+#define CCPOPT_PJUMP 3 /* RFC1962 */
+/* 4-15 unassigned */
+#define CCPOPT_HPPPC 16 /* RFC1962 */
+#define CCPOPT_STACLZS 17 /* RFC1974 */
+#define CCPOPT_MPPC 18 /* RFC2118 */
+#define CCPOPT_GFZA 19 /* RFC1962 */
+#define CCPOPT_V42BIS 20 /* RFC1962 */
+#define CCPOPT_BSDCOMP 21 /* RFC1977 */
+/* 22 unassigned */
+#define CCPOPT_LZSDCP 23 /* RFC1967 */
+#define CCPOPT_MVRCA 24 /* RFC1975 */
+#define CCPOPT_DEC 25 /* RFC1976 */
+#define CCPOPT_DEFLATE 26 /* RFC1979 */
+/* 27-254 unassigned */
+#define CCPOPT_RESV 255 /* RFC1962 */
+
+#define CCPOPT_MIN CCPOPT_OUI
+#define CCPOPT_MAX CCPOPT_DEFLATE /* XXX: should be CCPOPT_RESV but... */
+
+static const char *ccpconfopts[] = {
+ "OUI", /* (0) */
+ "Pred-1", /* (1) */
+ "Pred-2", /* (2) */
+ "Puddle", /* (3) */
+ "unassigned(4)", /* (4) */
+ "unassigned(5)", /* (5) */
+ "unassigned(6)", /* (6) */
+ "unassigned(7)", /* (7) */
+ "unassigned(8)", /* (8) */
+ "unassigned(9)", /* (9) */
+ "unassigned(10)", /* (10) */
+ "unassigned(11)", /* (11) */
+ "unassigned(12)", /* (12) */
+ "unassigned(13)", /* (13) */
+ "unassigned(14)", /* (14) */
+ "unassigned(15)", /* (15) */
+ "HP-PPC", /* (16) */
+ "Stac-LZS", /* (17) */
+ "MPPC", /* (18) */
+ "Gand-FZA", /* (19) */
+ "V.42bis", /* (20) */
+ "BSD-Comp", /* (21) */
+ "unassigned(22)", /* (22) */
+ "LZS-DCP", /* (23) */
+ "MVRCA", /* (24) */
+ "DEC", /* (25) */
+ "Deflate", /* (26) */
+};
+
+/* BACP Config Options */
-/* XXX This goes somewhere else. */
-#define PPP_HDRLEN 4
+#define BACPOPT_FPEER 1 /* RFC2125 */
+
+/* SDCP - to be supported */
+
+/* IPCP Config Options */
+
+#define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */
+#define IPCPOPT_IPCOMP 2 /* RFC1332 */
+#define IPCPOPT_ADDR 3 /* RFC1332 */
+#define IPCPOPT_MOBILE4 4 /* RFC2290 */
+
+#define IPCPOPT_PRIDNS 129 /* RFC1877 */
+#define IPCPOPT_PRINBNS 130 /* RFC1877 */
+#define IPCPOPT_SECDNS 131 /* RFC1877 */
+#define IPCPOPT_SECNBNS 132 /* RFC1877 */
+
+/* ATCP - to be supported */
+/* OSINLCP - to be supported */
+/* BVCP - to be supported */
+/* BCP - to be supported */
+/* IPXCP - to be supported */
+
+/* Auth Algorithms */
+
+/* 0-4 Reserved (RFC1994) */
+#define AUTHALG_CHAPMD5 5 /* RFC1994 */
+#define AUTHALG_MSCHAP1 128 /* RFC2433 */
+#define AUTHALG_MSCHAP2 129 /* RFC2795 */
+
+/* FCS Alternatives - to be supported */
+
+/* Multilink Endpoint Discriminator (RFC1717) */
+#define MEDCLASS_NULL 0 /* Null Class */
+#define MEDCLASS_LOCAL 1 /* Locally Assigned */
+#define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */
+#define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */
+#define MEDCLASS_MNB 4 /* PPP Magic Number Block */
+#define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */
+
+/* PPP LCP Callback */
+#define CALLBACK_AUTH 0 /* Location determined by user auth */
+#define CALLBACK_DSTR 1 /* Dialing string */
+#define CALLBACK_LID 2 /* Location identifier */
+#define CALLBACK_E164 3 /* E.164 number */
+#define CALLBACK_X500 4 /* X.500 distinguished name */
+#define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */
+
+/* CHAP */
+
+#define CHAP_CHAL 1
+#define CHAP_RESP 2
+#define CHAP_SUCC 3
+#define CHAP_FAIL 4
+
+#define CHAP_CODEMIN CHAP_CHAL
+#define CHAP_CODEMAX CHAP_FAIL
+
+static const char *chapcode[] = {
+ "Chal", /* (1) */
+ "Resp", /* (2) */
+ "Succ", /* (3) */
+ "Fail", /* (4) */
+};
+
+/* PAP */
+
+#define PAP_AREQ 1
+#define PAP_AACK 2
+#define PAP_ANAK 3
+
+#define PAP_CODEMIN PAP_AREQ
+#define PAP_CODEMAX PAP_ANAK
+
+static const char *papcode[] = {
+ "Auth-Req", /* (1) */
+ "Auth-Ack", /* (2) */
+ "Auth-Nak", /* (3) */
+};
+
+/* BAP */
+#define BAP_CALLREQ 1
+#define BAP_CALLRES 2
+#define BAP_CBREQ 3
+#define BAP_CBRES 4
+#define BAP_LDQREQ 5
+#define BAP_LDQRES 6
+#define BAP_CSIND 7
+#define BAP_CSRES 8
+
+static const char *ppp_protoname (u_int proto);
+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 int print_lcp_config_options (const u_char *p, int);
+static int print_ipcp_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 const char *
+ppp_protoname(u_int proto)
+{
+ static char buf[20];
+
+ switch (proto) {
+ case PPP_IP: return "IP";
+#ifdef PPP_XNS
+ case PPP_XNS: return "XNS";
+#endif
+ case PPP_IPX: return "IPX";
+ case PPP_VJC: return "VJC";
+ case PPP_VJNC: return "VJNC";
+#ifdef PPP_COMP
+ case PPP_COMP: return "COMP";
+#endif
+ case PPP_IPCP: return "IPCP";
+ case PPP_IPV6CP: return "IPV6CP";
+ case PPP_IPXCP: return "IPXCP";
+ case PPP_CCP: return "CCP";
+ case PPP_LCP: return "LCP";
+ case PPP_PAP: return "PAP";
+#ifdef PPP_LQR
+ case PPP_LQR: return "LQR";
+#endif
+ case PPP_CHAP: return "CHAP";
+ case PPP_BACP: return "BACP";
+ case PPP_BAP: return "BAP";
+ default:
+ snprintf(buf, sizeof(buf), "unknown-0x%04x", proto);
+ return buf;
+ }
+}
+
+/* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */
+static void
+handle_ctrl_proto(u_int proto, const u_char *p, int length)
+{
+ u_int code, len;
+ int (*pfunc)(const u_char *, int);
+ int x, j;
+
+ if (length < 1) {
+ printf("[|%s]", ppp_protoname(proto));
+ return;
+ } else if (length < 4) {
+ printf("[|%s 0x%02x]", ppp_protoname(proto), *p);
+ return;
+ }
+
+ code = *p;
+ if ((code >= CPCODES_MIN) && (code <= CPCODES_MAX))
+ printf("%s", cpcodes[code]);
+ else {
+ printf("0x%02x", code);
+ return;
+ }
+ p++;
+
+ printf("(%u)", *p); /* ID */
+ p++;
+
+ len = EXTRACT_16BITS(p);
+ p += 2;
+
+ if (length <= 4)
+ return; /* there may be a NULL confreq etc. */
+
+ switch (code) {
+ case CPCODES_VEXT:
+ if (length < 11)
+ break;
+ printf(", Magic-Num=%08x", EXTRACT_32BITS(p));
+ p += 4;
+ printf(" OUI=%02x%02x%02x", p[0], p[1], p[2]);
+ /* 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) */
+ do {
+ switch (proto) {
+ case PPP_LCP:
+ pfunc = print_lcp_config_options;
+ break;
+ case PPP_IPCP:
+ pfunc = print_ipcp_config_options;
+ break;
+ case PPP_CCP:
+ pfunc = print_ccp_config_options;
+ break;
+ case PPP_BACP:
+ pfunc = print_bacp_config_options;
+ break;
+ default:
+ /*
+ * This should never happen, but we set
+ * "pfunc" to squelch uninitialized
+ * variable warnings from compilers.
+ */
+ pfunc = NULL;
+ break;
+ }
+ if ((j = (*pfunc)(p, len)) == 0)
+ break;
+ x -= j;
+ p += j;
+ } while (x > 0);
+ break;
+
+ case CPCODES_TERM_REQ:
+ case CPCODES_TERM_ACK:
+ /* XXX: need to decode Data? */
+ break;
+ case CPCODES_CODE_REJ:
+ /* XXX: need to decode Rejected-Packet? */
+ break;
+ case CPCODES_PROT_REJ:
+ if (length < 6)
+ break;
+ printf(", Rejected-Protocol=%04x", EXTRACT_16BITS(p));
+ /* XXX: need to decode Rejected-Information? */
+ break;
+ case CPCODES_ECHO_REQ:
+ case CPCODES_ECHO_RPL:
+ case CPCODES_DISC_REQ:
+ case CPCODES_ID:
+ if (length < 8)
+ break;
+ printf(", Magic-Num=%08x", EXTRACT_32BITS(p));
+ /* XXX: need to decode Data? */
+ break;
+ case CPCODES_TIME_REM:
+ if (length < 12)
+ break;
+ printf(", Magic-Num=%08x", EXTRACT_32BITS(p));
+ printf(" Seconds-Remaining=%u", EXTRACT_32BITS(p + 4));
+ /* XXX: need to decode Message? */
+ break;
+ default:
+ printf(", unknown-Codes-0x%02x", code);
+ break;
+ }
+}
+
+/* LCP config options */
+static int
+print_lcp_config_options(const u_char *p, int length)
+{
+ int len, opt;
+
+ if (length < 2)
+ return 0;
+ len = p[1];
+ opt = p[0];
+ if (length < len)
+ return 0;
+ if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
+ printf(", %s", lcpconfopts[opt]);
+ else {
+ printf(", unknwhown-%d", opt);
+ return len;
+ }
+
+ switch (opt) {
+ case LCPOPT_VEXT:
+ if (len >= 6) {
+ printf(" OUI=%02x%02x%02x", p[2], p[3], p[4]);
+#if 0
+ printf(" kind=%02x", p[5]);
+ printf(" val=")
+ for (i = 0; i < len - 6; i++) {
+ printf("%02x", p[6 + i]);
+ }
+#endif
+ }
+ break;
+ case LCPOPT_MRU:
+ if (len == 4)
+ printf("=%u", EXTRACT_16BITS(p + 2));
+ break;
+ case LCPOPT_ACCM:
+ if (len == 6)
+ printf("=%08x", EXTRACT_32BITS(p + 2));
+ break;
+ case LCPOPT_AP:
+ if (len >= 4) {
+ if (p[2] == 0xc0 && p[3] == 0x23)
+ printf(" PAP");
+ else if (p[2] == 0xc2 && p[3] == 0x23) {
+ printf(" CHAP/");
+ switch (p[4]) {
+ default:
+ printf("unknown-algorithm-%u", p[4]);
+ break;
+ case AUTHALG_CHAPMD5:
+ printf("MD5");
+ break;
+ case AUTHALG_MSCHAP1:
+ printf("MSCHAPv1");
+ break;
+ case AUTHALG_MSCHAP2:
+ printf("MSCHAPv2");
+ break;
+ }
+ }
+ else if (p[2] == 0xc2 && p[3] == 0x27)
+ printf(" EAP");
+ else if (p[2] == 0xc0 && p[3] == 0x27)
+ printf(" SPAP");
+ else if (p[2] == 0xc1 && p[3] == 0x23)
+ printf(" Old-SPAP");
+ else
+ printf("unknown");
+ }
+ break;
+ case LCPOPT_QP:
+ if (len >= 4) {
+ if (p[2] == 0xc0 && p[3] == 0x25)
+ printf(" LQR");
+ else
+ printf(" unknown");
+ }
+ break;
+ case LCPOPT_MN:
+ if (len == 6)
+ printf("=%08x", EXTRACT_32BITS(p + 2));
+ break;
+ case LCPOPT_PFC:
+ break;
+ case LCPOPT_ACFC:
+ break;
+ case LCPOPT_LD:
+ if (len == 4)
+ printf("=%04x", EXTRACT_16BITS(p + 2));
+ break;
+ case LCPOPT_CBACK:
+ if (len < 3)
+ break;
+ switch (p[2]) { /* Operation */
+ case CALLBACK_AUTH:
+ printf(" UserAuth");
+ break;
+ case CALLBACK_DSTR:
+ printf(" DialString");
+ break;
+ case CALLBACK_LID:
+ printf(" LocalID");
+ break;
+ case CALLBACK_E164:
+ printf(" E.164");
+ break;
+ case CALLBACK_X500:
+ printf(" X.500");
+ break;
+ case CALLBACK_CBCP:
+ printf(" CBCP");
+ break;
+ default:
+ printf(" unknown-operation=%u", p[2]);
+ break;
+ }
+ break;
+ case LCPOPT_MLMRRU:
+ if (len == 4)
+ printf("=%u", EXTRACT_16BITS(p + 2));
+ break;
+ case LCPOPT_MLED:
+ if (len < 3)
+ break;
+ switch (p[2]) { /* class */
+ case MEDCLASS_NULL:
+ printf(" Null");
+ break;
+ case MEDCLASS_LOCAL:
+ printf(" Local"); /* XXX */
+ break;
+ case MEDCLASS_IPV4:
+ if (len != 7)
+ break;
+ printf(" IPv4=%s", ipaddr_string(p + 3));
+ break;
+ case MEDCLASS_MAC:
+ if (len != 9)
+ break;
+ printf(" MAC=%02x:%02x:%02x:%02x:%02x:%02x",
+ p[3], p[4], p[5], p[6], p[7], p[8]);
+ break;
+ case MEDCLASS_MNB:
+ printf(" Magic-Num-Block"); /* XXX */
+ break;
+ case MEDCLASS_PSNDN:
+ printf(" PSNDN"); /* XXX */
+ break;
+ }
+ break;
+
+/* XXX: to be supported */
+#if 0
+ case LCPOPT_DEP6:
+ case LCPOPT_FCSALT:
+ case LCPOPT_SDP:
+ case LCPOPT_NUMMODE:
+ case LCPOPT_DEP12:
+ case LCPOPT_DEP14:
+ case LCPOPT_DEP15:
+ case LCPOPT_DEP16:
+ case LCPOPT_MLSSNHF:
+ case LCPOPT_PROP:
+ case LCPOPT_DCEID:
+ case LCPOPT_MPP:
+ case LCPOPT_LCPAOPT:
+ case LCPOPT_COBS:
+ case LCPOPT_PE:
+ case LCPOPT_MLHF:
+ case LCPOPT_I18N:
+ case LCPOPT_SDLOS:
+ case LCPOPT_PPPMUX:
+ break;
+#endif
+ }
+ return len;
+}
+
+/* CHAP */
+static void
+handle_chap(const u_char *p, int length)
+{
+ u_int code, len;
+ int val_size, name_size, msg_size;
+ const u_char *p0;
+ int i;
+
+ p0 = p;
+ if (length < 1) {
+ printf("[|chap]");
+ return;
+ } else if (length < 4) {
+ printf("[|chap 0x%02x]", *p);
+ return;
+ }
+
+ code = *p;
+ if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX))
+ printf("%s", chapcode[code - 1]);
+ else {
+ printf("0x%02x", code);
+ return;
+ }
+ p++;
+
+ printf("(%u)", *p); /* ID */
+ p++;
+
+ len = EXTRACT_16BITS(p);
+ p += 2;
+
+ /*
+ * Note that this is a generic CHAP decoding routine. Since we
+ * 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.
+ */
+ switch (code) {
+ case CHAP_CHAL:
+ case CHAP_RESP:
+ if (length - (p - p0) < 1)
+ return;
+ val_size = *p; /* value size */
+ p++;
+ if (length - (p - p0) < val_size)
+ return;
+ printf(", Value=");
+ for (i = 0; i < val_size; i++)
+ printf("%02x", *p++);
+ name_size = len - (p - p0);
+ printf(", Name=");
+ for (i = 0; i < name_size; i++)
+ safeputchar(*p++);
+ break;
+ case CHAP_SUCC:
+ case CHAP_FAIL:
+ msg_size = len - (p - p0);
+ printf(", Msg=");
+ for (i = 0; i< msg_size; i++)
+ safeputchar(*p++);
+ break;
+ }
+}
+
+/* PAP (see RFC 1334) */
+static void
+handle_pap(const u_char *p, int length)
+{
+ u_int code, len;
+ int peerid_len, passwd_len, msg_len;
+ const u_char *p0;
+ int i;
+
+ p0 = p;
+ if (length < 1) {
+ printf("[|pap]");
+ return;
+ } else if (length < 4) {
+ printf("[|pap 0x%02x]", *p);
+ return;
+ }
+
+ code = *p;
+ if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX))
+ printf("%s", papcode[code - 1]);
+ else {
+ printf("0x%02x", code);
+ return;
+ }
+ p++;
+
+ printf("(%u)", *p); /* ID */
+ p++;
+
+ len = EXTRACT_16BITS(p);
+ p += 2;
+
+ switch (code) {
+ case PAP_AREQ:
+ if (length - (p - p0) < 1)
+ return;
+ peerid_len = *p; /* Peer-ID Length */
+ p++;
+ if (length - (p - p0) < peerid_len)
+ return;
+ printf(", Peer=");
+ for (i = 0; i < peerid_len; i++)
+ safeputchar(*p++);
+
+ if (length - (p - p0) < 1)
+ return;
+ passwd_len = *p; /* Password Length */
+ p++;
+ if (length - (p - p0) < passwd_len)
+ return;
+ printf(", Name=");
+ for (i = 0; i < passwd_len; i++)
+ safeputchar(*p++);
+ break;
+ case PAP_AACK:
+ case PAP_ANAK:
+ if (length - (p - p0) < 1)
+ return;
+ msg_len = *p; /* Msg-Length */
+ p++;
+ if (length - (p - p0) < msg_len)
+ return;
+ printf(", Msg=");
+ for (i = 0; i< msg_len; i++)
+ safeputchar(*p++);
+ break;
+ }
+ return;
+}
+
+/* BAP */
+static void
+handle_bap(const u_char *p, int length)
+{
+ /* XXX: to be supported!! */
+}
+
+
+/* IPCP config options */
+static int
+print_ipcp_config_options(const u_char *p, int length)
+{
+ int len, opt;
+
+ if (length < 2)
+ return 0;
+ len = p[1];
+ opt = p[0];
+ if (length < len)
+ return 0;
+ switch (opt) {
+ case IPCPOPT_2ADDR: /* deprecated */
+ if (len != 10)
+ goto invlen;
+ printf(", IP-Addrs src=%s dst=%s",
+ ipaddr_string(p + 2),
+ ipaddr_string(p + 6));
+ break;
+ case IPCPOPT_IPCOMP:
+ if (len < 4)
+ goto invlen;
+ printf(", IP-Comp");
+ if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
+ printf(" VJ-Comp");
+ /* XXX: VJ-Comp parameters should be decoded */
+ } else
+ printf(" unknown-comp-proto=%04x", EXTRACT_16BITS(p + 2));
+ break;
+ case IPCPOPT_ADDR:
+ if (len != 6)
+ goto invlen;
+ printf(", IP-Addr=%s", ipaddr_string(p + 2));
+ break;
+ case IPCPOPT_MOBILE4:
+ if (len != 6)
+ goto invlen;
+ printf(", Home-Addr=%s", ipaddr_string(p + 2));
+ break;
+ case IPCPOPT_PRIDNS:
+ if (len != 6)
+ goto invlen;
+ printf(", Pri-DNS=%s", ipaddr_string(p + 2));
+ break;
+ case IPCPOPT_PRINBNS:
+ if (len != 6)
+ goto invlen;
+ printf(", Pri-NBNS=%s", ipaddr_string(p + 2));
+ break;
+ case IPCPOPT_SECDNS:
+ if (len != 6)
+ goto invlen;
+ printf(", Sec-DNS=%s", ipaddr_string(p + 2));
+ break;
+ case IPCPOPT_SECNBNS:
+ if (len != 6)
+ goto invlen;
+ printf(", Sec-NBNS=%s", ipaddr_string(p + 2));
+ break;
+ default:
+ printf(", unknown-%d", opt);
+ break;
+ }
+ return len;
+
+invlen:
+ printf(", invalid-length-%d", opt);
+ return 0;
+}
+
+/* CCP config options */
+static int
+print_ccp_config_options(const u_char *p, int length)
+{
+ int len, opt;
+
+ if (length < 2)
+ return 0;
+ len = p[1];
+ opt = p[0];
+ if (length < len)
+ return 0;
+ if ((opt >= CCPOPT_MIN) && (opt <= CCPOPT_MAX))
+ printf(", %s", ccpconfopts[opt]);
+#if 0 /* XXX */
+ switch (opt) {
+ case CCPOPT_OUI:
+ case CCPOPT_PRED1:
+ case CCPOPT_PRED2:
+ case CCPOPT_PJUMP:
+ case CCPOPT_HPPPC:
+ case CCPOPT_STACLZS:
+ 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;
+
+ default:
+ printf(", unknown-%d", opt);
+ break;
+ }
+#endif
+ return len;
+}
+
+/* BACP config options */
+static int
+print_bacp_config_options(const u_char *p, int length)
+{
+ int len, opt;
+
+ if (length < 2)
+ return 0;
+ len = p[1];
+ opt = p[0];
+ if (length < len)
+ return 0;
+ if (opt == BACPOPT_FPEER) {
+ printf(", Favored-Peer");
+ printf(" Magic-Num=%08x", EXTRACT_32BITS(p + 2));
+ } else {
+ printf(", unknown-option-%d", opt);
+ }
+ return len;
+}
+
+
+/* PPP */
+static void
+handle_ppp(u_int proto, const u_char *p, int length)
+{
+ switch (proto) {
+ case PPP_LCP:
+ case PPP_IPCP:
+ case PPP_CCP:
+ case PPP_BACP:
+ handle_ctrl_proto(proto, p, length);
+ break;
+ case PPP_CHAP:
+ handle_chap(p, length);
+ break;
+ case PPP_PAP:
+ handle_pap(p, length);
+ break;
+ case PPP_BAP: /* XXX: not yet completed */
+ handle_bap(p, length);
+ break;
+ case ETHERTYPE_IP: /*XXX*/
+ case PPP_IP:
+ ip_print(p, length);
+ break;
+#ifdef INET6
+ case ETHERTYPE_IPV6: /*XXX*/
+ case PPP_IPV6:
+ ip6_print(p, length);
+ break;
+#endif
+ case ETHERTYPE_IPX: /*XXX*/
+ case PPP_IPX:
+ ipx_print(p, length);
+ break;
+ }
+}
/* Standard PPP printer */
void
+ppp_print(register const u_char *p, u_int length)
+{
+ u_int proto;
+ u_int full_length = length;
+
+ /*
+ * Here, we assume that p points to the Address and Control
+ * field (if they present).
+ */
+ if (length < 2)
+ goto trunc;
+ if (*p == PPP_ADDRESS && *(p + 1) == PPP_CONTROL) {
+ p += 2; /* ACFC not used */
+ length -= 2;
+ }
+
+ if (length < 2)
+ goto trunc;
+ if (*p % 2) {
+ proto = *p; /* PFC is used */
+ p++;
+ length--;
+ } else {
+ proto = EXTRACT_16BITS(p);
+ p += 2;
+ length -= 2;
+ }
+
+ printf("%s %d: ", ppp_protoname(proto), full_length);
+
+ handle_ppp(proto, p, length);
+ return;
+trunc:
+ printf("[|ppp]");
+}
+
+
+/* PPP I/F printer */
+void
ppp_if_print(u_char *user, const struct pcap_pkthdr *h,
register const u_char *p)
{
register u_int length = h->len;
register u_int caplen = h->caplen;
- const struct ip *ip;
ts_print(&h->ts);
goto out;
}
+ /*
+ * Some printers want to get back at the link level addresses,
+ * and/or check that they're not walking off the end of the packet.
+ * Rather than pass them all the way down, we set these globals. */
+
+ packetp = p;
+ snapend = p + caplen;
+
+#if 0
+ /*
+ * XXX: seems to assume that there are 2 octets prepended to an
+ * actual PPP frame. The 1st octet looks like Input/Output flag
+ * while 2nd octet is unknown, at least to me
+ *
+ * That was what the original tcpdump code did.
+ *
+ * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
+ * packets and 0 for inbound packets - but only if the
+ * protocol field has the 0x8000 bit set (i.e., it's a network
+ * control protocol); it does so before running the packet through
+ * "bpf_filter" to see if it should be discarded, and to see
+ * if we should update the time we sent the most recent packet...
+ *
+ * ...but it puts the original address field back after doing
+ * so.
+ *
+ * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
+ *
+ * I don't know if any PPP implementation handed up to a BPF
+ * device packets with the first octet being 1 for outbound and
+ * whether that ever needs to be checked or not.
+ *
+ * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
+ * and its tcpdump appears to assume that the frame always
+ * begins with an address field and a control field, and that
+ * the address field might be 0x0f or 0x8f, for Cisco
+ * point-to-point with HDLC framing as per section 4.3.1 of RFC
+ * 1547, as well as 0xff, for PPP in HDLC-like framing as per
+ * RFC 1662.
+ *
+ * (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]);
+#endif
+
+ ppp_print(p, length);
+
+ if (xflag)
+ default_print(p, caplen);
+out:
+ putchar('\n');
+}
+
+/*
+ * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
+ * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
+ * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
+ * discard them *if* those are the first two octets, and parse the remaining
+ * packet as a PPP packet, as "ppp_print()" does).
+ *
+ * This handles, for example, DLT_PPP_SERIAL in NetBSD.
+ */
+void
+ppp_hdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
+ register const u_char *p)
+{
+ register u_int length = h->len;
+ register u_int caplen = h->caplen;
+ u_int proto;
+
+ if (caplen < 2) {
+ printf("[|ppp]");
+ goto out;
+ }
+
/*
* Some printers want to get back at the link level addresses,
* and/or check that they're not walking off the end of the packet.
packetp = p;
snapend = p + caplen;
- if (eflag)
- printf("%c %4d %02x %04x: ", p[0] ? 'O' : 'I', length,
- p[1], ntohs(*(u_short *)&p[2]));
+ switch (p[0]) {
+
+ case PPP_ADDRESS:
+ if (caplen < 4) {
+ printf("[|ppp]");
+ goto out;
+ }
+
+ ts_print(&h->ts);
+ if (eflag)
+ printf("%02x %02x %d ", p[0], p[1], length);
+ p += 2;
+ length -= 2;
+
+ proto = EXTRACT_16BITS(p);
+ p += 2;
+ length -= 2;
+ printf("%s: ", ppp_protoname(proto));
+
+ handle_ppp(proto, p, length);
+ break;
- length -= PPP_HDRLEN;
- ip = (struct ip *)(p + PPP_HDRLEN);
- ip_print((const u_char *)ip, length);
+ case CHDLC_UNICAST:
+ case CHDLC_BCAST:
+ /*
+ * Have the Cisco HDLC print routine do all the work.
+ */
+ chdlc_if_print(user, h, p);
+ return;
+
+ default:
+ ts_print(&h->ts);
+ if (eflag)
+ printf("%02x %02x %d ", p[0], p[1], length);
+ p += 2;
+ length -= 2;
+
+ /*
+ * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
+ * the next two octets as an Ethernet type; does that
+ * ever happen?
+ */
+ printf("unknown addr %02x; ctrl %02x", p[0], p[1]);
+ break;
+ }
if (xflag)
- default_print((const u_char *)ip, caplen - PPP_HDRLEN);
+ default_print(p, caplen);
out:
putchar('\n');
}
-/* proto type to string mapping */
-static struct tok ptype2str[] = {
+
+
+struct tok ppptype2str[] = {
+ { PPP_IP, "IP" },
+ { PPP_OSI, "OSI" },
+ { PPP_NS, "NS" },
+ { PPP_DECNET, "DECNET" },
+ { PPP_APPLE, "APPLE" },
+ { PPP_IPX, "IPX" },
{ PPP_VJC, "VJC" },
{ PPP_VJNC, "VJNC" },
- { PPP_OSI, "OSI" },
- { PPP_LCP, "LCP" },
+ { PPP_BRPDU, "BRPDU" },
+ { PPP_STII, "STII" },
+ { PPP_VINES, "VINES" },
+
+ { PPP_HELLO, "HELLO" },
+ { PPP_LUXCOM, "LUXCOM" },
+ { PPP_SNS, "SNS" },
{ PPP_IPCP, "IPCP" },
+ { PPP_OSICP, "OSICP" },
+ { PPP_NSCP, "NSCP" },
+ { PPP_DECNETCP, "DECNETCP" },
+ { PPP_APPLECP, "APPLECP" },
+ { PPP_IPXCP, "IPXCP" },
+ { PPP_STIICP, "STIICP" },
+ { PPP_VINESCP, "VINESCP" },
+
+ { PPP_LCP, "LCP" },
+ { PPP_PAP, "PAP" },
+ { PPP_LQM, "LQM" },
+ { PPP_CHAP, "CHAP" },
+ { PPP_BACP, "BACP" },
+ { PPP_BAP, "BAP" },
+ { PPP_MP, "MP" },
{ 0, NULL }
};
ppp_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h,
register const u_char *p)
{
+#ifdef __bsdi__
register u_int length = h->len;
register u_int caplen = h->caplen;
register int hdrlength;
- u_short ptype;
+ u_int16_t ptype;
+ const u_char *q;
+ int i;
ts_print(&h->ts);
snapend = p + caplen;
hdrlength = 0;
+#if 0
if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
- if (eflag)
+ if (eflag)
printf("%02x %02x ", p[0], p[1]);
p += 2;
hdrlength = 2;
}
- if (eflag)
+ if (eflag)
printf("%d ", length);
/* Retrieve the protocol type */
if (*p & 01) {
/* Compressed protocol field */
ptype = *p;
- if (eflag)
+ if (eflag)
printf("%02x ", ptype);
p++;
hdrlength += 1;
} else {
/* Un-compressed protocol field */
- ptype = ntohs(*(u_short *)p);
- if (eflag)
+ 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, length - (q - p), 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
+ }
+ goto printx;
+ case PPP_VJNC:
+ ptype = vjc_print(q, length - (q - p), 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
+ }
+ 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;
- if (ptype == PPP_IP)
+ switch (ptype) {
+ case PPP_IP:
ip_print(p, length);
- else
- printf("%s ", tok2str(ptype2str, "proto-#%d", ptype));
+ break;
+#ifdef INET6
+ case PPP_IPV6:
+ ip6_print(p, length);
+ break;
+#endif
+ default:
+ printf("%s ", tok2str(ppptype2str, "proto-#%d", ptype));
+ }
+printx:
if (xflag)
default_print((const u_char *)p, caplen - hdrlength);
out:
putchar('\n');
+#endif /* __bsdi__ */
}
projects / tcpdump / blobdiff