*/
#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.88 2003-05-22 16:52:38 hannes Exp $ (LBL)";
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.98 2004-07-06 22:11:17 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include <pcap.h>
#include <stdio.h>
+#include <stdlib.h>
#include "interface.h"
#include "extract.h"
#include "ppp.h"
#include "chdlc.h"
#include "ethertype.h"
+#include "oui.h"
/*
* The following constatns are defined by IANA. Please refer to
{ PPP_DECNET, "DECNET" },
{ PPP_APPLE, "APPLE" },
{ PPP_IPX, "IPX" },
- { PPP_VJC, "VJC" },
- { PPP_VJNC, "VJNC" },
+ { PPP_VJC, "VJC IP" },
+ { PPP_VJNC, "VJNC IP" },
{ PPP_BRPDU, "BRPDU" },
{ PPP_STII, "STII" },
{ PPP_VINES, "VINES" },
{ PPP_MPLS_UCAST, "MPLS" },
{ PPP_MPLS_MCAST, "MPLS" },
+ { PPP_COMP, "Compressed"},
{ PPP_HELLO, "HELLO" },
{ PPP_LUXCOM, "LUXCOM" },
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);
/* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */
static void
handle_ctrl_proto(u_int proto, const u_char *pptr, int length)
{
+ const char *typestr;
u_int code, len;
int (*pfunc)(const u_char *, int);
int x, j;
tptr=pptr;
- printf("%s, ",tok2str(ppptype2str, "unknown", proto));
+ typestr = tok2str(ppptype2str, "unknown", proto);
+ printf("%s, ",typestr);
if (length < 4) /* FIXME weak boundary checking */
- return;
+ goto trunc;
+ TCHECK2(*tptr, 2);
code = *tptr++;
- printf("%s, id %u",
- tok2str(cpcodes, "Unknown Opcode 0x%02x",code),
+ printf("%s (0x%02x), id %u",
+ tok2str(cpcodes, "Unknown Opcode",code),
+ code,
*tptr++); /* ID */
+ TCHECK2(*tptr, 2);
len = EXTRACT_16BITS(tptr);
tptr += 2;
case CPCODES_VEXT:
if (length < 11)
break;
+ TCHECK2(*tptr, 4);
printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
tptr += 4;
- printf(" OUI 0x%06x", EXTRACT_24BITS(tptr));
+ TCHECK2(*tptr, 3);
+ printf(" Vendor: %s (%u)",
+ tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)),
+ EXTRACT_24BITS(tptr));
/* XXX: need to decode Kind and Value(s)? */
break;
case CPCODES_CONF_REQ:
case CPCODES_PROT_REJ:
if (length < 6)
break;
+ TCHECK2(*tptr, 2);
printf(", Rejected %s Protocol (0x%04x)",
tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)),
EXTRACT_16BITS(tptr));
case CPCODES_ID:
if (length < 8)
break;
+ TCHECK2(*tptr, 4);
printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
/* XXX: need to decode Data? */
break;
case CPCODES_TIME_REM:
if (length < 12)
break;
+ TCHECK2(*tptr, 4);
printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
+ TCHECK2(*(tptr + 4), 4);
printf(", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4));
/* XXX: need to decode Message? */
break;
if (vflag >1)
print_unknown_data(pptr-2,"\n\t",length+2);
+ return;
+
+trunc:
+ printf("[|%s]", typestr);
}
/* LCP config options */
if (length < 2)
return 0;
+ TCHECK2(*p, 2);
len = p[1];
opt = p[0];
if (length < len)
return 0;
if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
- printf(", %s ", lcpconfopts[opt]);
+ printf(", %s (%u)", lcpconfopts[opt],opt);
else {
printf(", unknown LCP option 0x%02x", opt);
return len;
switch (opt) {
case LCPOPT_VEXT:
if (len >= 6) {
- printf(" OUI 0x%06x", EXTRACT_24BITS(p+2));
+ TCHECK2(*(p + 2), 3);
+ printf(" Vendor: %s (%u)",
+ tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)),
+ EXTRACT_24BITS(p+2));
#if 0
- printf(" kind 0x%02x", p[5]);
- printf(" val 0x")
+ 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
}
break;
case LCPOPT_MRU:
- if (len == 4)
+ if (len == 4) {
+ TCHECK2(*(p + 2), 2);
printf(" %u", EXTRACT_16BITS(p + 2));
+ }
break;
case LCPOPT_ACCM:
- if (len == 6)
- printf(" %08x", EXTRACT_32BITS(p + 2));
+ if (len == 6) {
+ TCHECK2(*(p + 2), 4);
+ printf(" 0x%08x", EXTRACT_32BITS(p + 2));
+ }
break;
case LCPOPT_AP:
if (len >= 4) {
+ TCHECK2(*(p + 2), 2);
switch (EXTRACT_16BITS(p+2)) {
case PPP_PAP:
printf(" PAP");
break;
case PPP_CHAP:
printf(" CHAP");
+ TCHECK(p[4]);
switch (p[4]) {
default:
printf(", unknown-algorithm-%u", p[4]);
break;
case LCPOPT_QP:
if (len >= 4) {
+ TCHECK2(*(p + 2), 2);
if (EXTRACT_16BITS(p+2) == PPP_LQM)
printf(" LQR");
else
}
break;
case LCPOPT_MN:
- if (len == 6)
+ if (len == 6) {
+ TCHECK2(*(p + 2), 4);
printf(" 0x%08x", EXTRACT_32BITS(p + 2));
+ }
break;
case LCPOPT_PFC:
break;
case LCPOPT_ACFC:
break;
case LCPOPT_LD:
- if (len == 4)
+ if (len == 4) {
+ TCHECK2(*(p + 2), 2);
printf(" 0x%04x", EXTRACT_16BITS(p + 2));
+ }
break;
case LCPOPT_CBACK:
if (len < 3)
break;
+ TCHECK(p[2]);
switch (p[2]) { /* Operation */
case CALLBACK_AUTH:
printf(" UserAuth");
}
break;
case LCPOPT_MLMRRU:
- if (len == 4)
+ if (len == 4) {
+ TCHECK2(*(p + 2), 2);
printf(" %u", EXTRACT_16BITS(p + 2));
+ }
break;
case LCPOPT_MLED:
if (len < 3)
break;
+ TCHECK(p[2]);
switch (p[2]) { /* class */
case MEDCLASS_NULL:
printf(" Null");
case MEDCLASS_IPV4:
if (len != 7)
break;
+ TCHECK2(*(p + 3), 4);
printf(" IPv4 %s", 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]);
break;
#endif
}
return len;
+
+trunc:
+ printf("[|lcp]");
+ return 0;
}
/* CHAP */
printf("[|chap]");
return;
} else if (length < 4) {
+ TCHECK(*p);
printf("[|chap 0x%02x]", *p);
return;
}
+ TCHECK(*p);
code = *p;
if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX))
printf("%s", chapcode[code - 1]);
}
p++;
+ TCHECK(*p);
printf("(%u)", *p); /* ID */
p++;
+ TCHECK2(*p, 2);
len = EXTRACT_16BITS(p);
p += 2;
case CHAP_RESP:
if (length - (p - p0) < 1)
return;
+ TCHECK(*p);
val_size = *p; /* value size */
p++;
if (length - (p - p0) < val_size)
return;
printf(", Value ");
- for (i = 0; i < val_size; i++)
+ 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++)
+ for (i = 0; i < name_size; i++) {
+ TCHECK(*p);
safeputchar(*p++);
+ }
break;
case CHAP_SUCC:
case CHAP_FAIL:
msg_size = len - (p - p0);
printf(", Msg ");
- for (i = 0; i< msg_size; i++)
+ for (i = 0; i< msg_size; i++) {
+ TCHECK(*p);
safeputchar(*p++);
+ }
break;
}
+ return;
+
+trunc:
+ printf("[|chap]");
}
/* PAP (see RFC 1334) */
printf("[|pap]");
return;
} else if (length < 4) {
+ TCHECK(*p);
printf("[|pap 0x%02x]", *p);
return;
}
+ TCHECK(*p);
code = *p;
if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX))
printf("%s", papcode[code - 1]);
}
p++;
+ TCHECK(*p);
printf("(%u)", *p); /* ID */
p++;
+ TCHECK2(*p, 2);
len = EXTRACT_16BITS(p);
p += 2;
case PAP_AREQ:
if (length - (p - p0) < 1)
return;
+ TCHECK(*p);
peerid_len = *p; /* Peer-ID Length */
p++;
if (length - (p - p0) < peerid_len)
return;
printf(", Peer ");
- for (i = 0; i < peerid_len; i++)
+ for (i = 0; i < peerid_len; i++) {
+ TCHECK(*p);
safeputchar(*p++);
+ }
if (length - (p - p0) < 1)
return;
+ TCHECK(*p);
passwd_len = *p; /* Password Length */
p++;
if (length - (p - p0) < passwd_len)
return;
printf(", Name ");
- for (i = 0; i < passwd_len; i++)
+ for (i = 0; i < passwd_len; i++) {
+ TCHECK(*p);
safeputchar(*p++);
+ }
break;
case PAP_AACK:
case PAP_ANAK:
if (length - (p - p0) < 1)
return;
+ TCHECK(*p);
msg_len = *p; /* Msg-Length */
p++;
if (length - (p - p0) < msg_len)
return;
printf(", Msg ");
- for (i = 0; i< msg_len; i++)
+ for (i = 0; i< msg_len; i++) {
+ TCHECK(*p);
safeputchar(*p++);
+ }
break;
}
return;
+
+trunc:
+ printf("[|pap]");
}
/* BAP */
if (length < 2)
return 0;
+ TCHECK2(*p, 2);
len = p[1];
opt = p[0];
if (length < len)
case IPCPOPT_2ADDR: /* deprecated */
if (len != 10)
goto invlen;
+ TCHECK2(*(p + 6), 4);
printf(", IP-Addrs src %s, dst %s",
ipaddr_string(p + 2),
ipaddr_string(p + 6));
if (len < 4)
goto invlen;
printf(", IP-Comp");
+ TCHECK2(*(p + 2), 2);
if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
printf(" VJ-Comp");
/* XXX: VJ-Comp parameters should be decoded */
case IPCPOPT_ADDR:
if (len != 6)
goto invlen;
+ TCHECK2(*(p + 2), 4);
printf(", IP-Addr %s", ipaddr_string(p + 2));
break;
case IPCPOPT_MOBILE4:
if (len != 6)
goto invlen;
+ TCHECK2(*(p + 2), 4);
printf(", Home-Addr %s", ipaddr_string(p + 2));
break;
case IPCPOPT_PRIDNS:
if (len != 6)
goto invlen;
+ TCHECK2(*(p + 2), 4);
printf(", Pri-DNS %s", ipaddr_string(p + 2));
break;
case IPCPOPT_PRINBNS:
if (len != 6)
goto invlen;
+ TCHECK2(*(p + 2), 4);
printf(", Pri-NBNS %s", ipaddr_string(p + 2));
break;
case IPCPOPT_SECDNS:
if (len != 6)
goto invlen;
+ TCHECK2(*(p + 2), 4);
printf(", Sec-DNS %s", ipaddr_string(p + 2));
break;
case IPCPOPT_SECNBNS:
if (len != 6)
goto invlen;
+ TCHECK2(*(p + 2), 4);
printf(", Sec-NBNS %s", ipaddr_string(p + 2));
break;
default:
invlen:
printf(", invalid-length-%d", opt);
return 0;
+
+trunc:
+ printf("[|ipcp]");
+ return 0;
}
/* CCP config options */
if (length < 2)
return 0;
+ TCHECK2(*p, 2);
len = p[1];
opt = p[0];
if (length < len)
}
#endif
return len;
+
+trunc:
+ printf("[|ccp]");
+ return 0;
}
/* BACP config options */
if (length < 2)
return 0;
+ TCHECK2(*p, 2);
len = p[1];
opt = p[0];
if (length < len)
return 0;
if (opt == BACPOPT_FPEER) {
+ TCHECK2(*(p + 2), 4);
printf(", Favored-Peer");
printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2));
} else {
printf(", unknown-option-%d", opt);
}
return len;
+
+trunc:
+ printf("[|bacp]");
+ return 0;
+}
+
+
+static void
+ppp_hdlc(const u_char *p, int length)
+{
+ u_char *b, *s, *t, c;
+ int i, proto;
+ const void *se;
+
+ b = (u_int8_t *)malloc(length);
+ if (b == NULL)
+ return;
+
+ /*
+ * Unescape all the data into a temporary, private, buffer.
+ * Do this so that we dont overwrite the original packet
+ * contents.
+ */
+ for (s = (u_char *)p, t = b, i = length; i > 0; i--) {
+ c = *s++;
+ if (c == 0x7d) {
+ if (i > 1) {
+ i--;
+ c = *s++ ^ 0x20;
+ } else
+ continue;
+ }
+ *t++ = c;
+ }
+
+ se = snapend;
+ snapend = t;
+
+ /* now lets guess about the payload codepoint format */
+ proto = *b; /* start with a one-octet codepoint guess */
+
+ switch (proto) {
+ case PPP_IP:
+ ip_print(b+1, t - b - 1);
+ goto cleanup;
+#ifdef INET6
+ case PPP_IPV6:
+ ip6_print(b+1, t - b - 1);
+ goto cleanup;
+#endif
+ default: /* no luck - try next guess */
+ break;
+ }
+
+ proto = EXTRACT_16BITS(b); /* next guess - load two octets */
+
+ switch (proto) {
+ case 0xff03: /* looks like a PPP frame */
+ proto = EXTRACT_16BITS(b+2); /* load the PPP proto-id */
+ handle_ppp(proto, b+4, t - b - 4);
+ break;
+ default: /* last guess - proto must be a PPP proto-id */
+ handle_ppp(proto, b+2, t - b - 2);
+ break;
+ }
+
+cleanup:
+ snapend = se;
+ free(b);
+ return;
}
static void
handle_ppp(u_int proto, const u_char *p, int length)
{
+ if ((proto & 0xff00) == 0x7e00) {/* is this an escape code ? */
+ ppp_hdlc(p-1, length);
+ return;
+ }
+
switch (proto) {
case PPP_LCP:
case PPP_IPCP:
handle_bap(p, length);
break;
case ETHERTYPE_IP: /*XXX*/
+ case PPP_VJNC:
case PPP_IP:
ip_print(p, length);
break;
case PPP_MPLS_MCAST:
mpls_print(p, length);
break;
+ case PPP_COMP:
+ printf("compressed PPP data");
+ break;
default:
- printf("unknown PPP protocol (0x%04x)", proto);
- print_unknown_data(p,"\n\t",length);
- break;
+ printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
+ print_unknown_data(p,"\n\t",length);
+ break;
}
}
*/
if (length < 2)
goto trunc;
+ TCHECK2(*p, 2);
if (*p == PPP_ADDRESS && *(p + 1) == PPP_CONTROL) {
p += 2; /* ACFC not used */
length -= 2;
if (length < 2)
goto trunc;
+ TCHECK(*p);
if (*p % 2) {
proto = *p; /* PFC is used */
p++;
length--;
hdr_len++;
} else {
+ TCHECK2(*p, 2);
proto = EXTRACT_16BITS(p);
p += 2;
length -= 2;
}
if (eflag)
- printf("PPP-%s (0x%04x), length %u: ",
+ printf("%s (0x%04x), length %u: ",
tok2str(ppptype2str, "unknown", proto),
proto,
olen);
projects / tcpdump / blobdiff