* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
+#ifndef lint
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.128.2.9 2005-01-12 11:27:07 hannes Exp $ (LBL)";
+#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#include "interface.h"
#include "extract.h" /* must come after interface.h */
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.129 2003-11-15 00:39:27 guy Exp $ (LBL)";
-#endif
#include "ip.h"
#include "ipproto.h"
static void
ip_printroute(const char *type, register const u_char *cp, u_int length)
{
- register u_int ptr = cp[2] - 1;
+ register u_int ptr;
register u_int len;
+ if (length < 3) {
+ printf(" [bad length %u]", length);
+ return;
+ }
printf(" %s{", type);
if ((length + 1) & 3)
- printf(" [bad length %d]", length);
+ printf(" [bad length %u]", length);
+ ptr = cp[2] - 1;
if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
- printf(" [bad ptr %d]", cp[2]);
+ printf(" [bad ptr %u]", cp[2]);
type = "";
for (len = 3; len < length; len += 4) {
}
/*
- * If source-routing is present, return the final destination.
+ * If source-routing is present and valid, return the final destination.
* Otherwise, return IP destination.
*
* This is used for UDP and TCP pseudo-header in the checksum
length = (IP_HL(ip) << 2) - sizeof(struct ip);
for (; length > 0; cp += len, length -= len) {
- int tt = *cp;
+ int tt;
- if (tt == IPOPT_NOP || tt == IPOPT_EOL)
+ TCHECK(*cp);
+ tt = *cp;
+ if (tt == IPOPT_EOL)
+ break;
+ else if (tt == IPOPT_NOP)
len = 1;
else {
- if (&cp[1] >= snapend) {
- return 0;
- }
+ TCHECK(cp[1]);
len = cp[1];
+ if (len < 2)
+ break;
}
- if (len <= 0) {
- return 0;
- }
- if (&cp[1] >= snapend || cp + len > snapend) {
- return 0;
- }
+ TCHECK2(*cp, len);
switch (tt) {
case IPOPT_SSRR:
case IPOPT_LSRR:
+ if (len < 7)
+ break;
memcpy(&retval, cp + len - 4, 4);
return retval;
}
}
- return ip->ip_dst.s_addr;
+trunc:
+ memcpy(&retval, &ip->ip_dst.s_addr, sizeof(u_int32_t));
+ return retval;
}
static void
ip_printts(register const u_char *cp, u_int length)
{
- register u_int ptr = cp[2] - 1;
- register u_int len = 0;
+ register u_int ptr;
+ register u_int len;
int hoplen;
const char *type;
+ if (length < 4) {
+ printf("[bad length %d]", length);
+ return;
+ }
printf(" TS{");
hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
if ((length - 4) & (hoplen-1))
printf("[bad length %d]", length);
+ ptr = cp[2] - 1;
+ len = 0;
if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
printf("[bad ptr %d]", cp[2]);
switch (cp[3]&0xF) {
register u_int len;
for (; length > 0; cp += len, length -= len) {
- int tt = *cp;
+ int tt;
+ TCHECK(*cp);
+ tt = *cp;
if (tt == IPOPT_NOP || tt == IPOPT_EOL)
len = 1;
else {
- if (&cp[1] >= snapend) {
- printf("[|ip]");
+ TCHECK(cp[1]);
+ len = cp[1];
+ if (len < 2) {
+ printf("[|ip op len %d]", len);
return;
}
- len = cp[1];
- }
- if (len <= 0) {
- printf("[|ip op len %d]", len);
- return;
- }
- if (&cp[1] >= snapend || cp + len > snapend) {
- printf("[|ip]");
- return;
+ TCHECK2(*cp, len);
}
switch (tt) {
printf(" RA");
if (len != 4)
printf("{%d}", len);
- else if (cp[2] || cp[3])
- printf("%d.%d", cp[2], cp[3]);
+ else {
+ TCHECK(cp[3]);
+ if (cp[2] || cp[3])
+ printf("%d.%d", cp[2], cp[3]);
+ }
break;
default:
break;
}
}
+ return;
+
+trunc:
+ printf("[|ip]");
}
/*
{
register const struct ip *ip;
register u_int hlen, len, len0, off;
+ const u_char *ipend;
register const u_char *cp;
u_char nh;
int advance;
return;
}
if (length < sizeof (struct ip)) {
- (void)printf("truncated-ip %d", length);
+ (void)printf("truncated-ip %u", length);
return;
}
hlen = IP_HL(ip) * 4;
if (hlen < sizeof (struct ip)) {
- (void)printf("bad-hlen %d", hlen);
+ (void)printf("bad-hlen %u", hlen);
return;
}
len = EXTRACT_16BITS(&ip->ip_len);
if (length < len)
- (void)printf("truncated-ip - %d bytes missing! ",
+ (void)printf("truncated-ip - %u bytes missing! ",
len - length);
+ if (len < hlen) {
+ (void)printf("bad-len %u", len);
+ return;
+ }
+
+ /*
+ * Cut off the snapshot length to the end of the IP payload.
+ */
+ ipend = bp + len;
+ if (ipend < snapend)
+ snapend = ipend;
+
len -= hlen;
len0 = len;
case IPPROTO_AH:
nh = *cp;
advance = ah_print(cp);
+ if (advance <= 0)
+ break;
cp += advance;
len -= advance;
goto again;
{
int enh, padlen;
advance = esp_print(cp, (const u_char *)ip, &enh, &padlen);
+ if (advance <= 0)
+ break;
cp += advance;
len -= advance + padlen;
- if (enh < 0)
- break;
nh = enh & 0xff;
goto again;
}
{
int enh;
advance = ipcomp_print(cp, &enh);
+ if (advance <= 0)
+ break;
cp += advance;
len -= advance;
- if (enh < 0)
- break;
nh = enh & 0xff;
goto again;
}
break;
case IPPROTO_EGP:
- egp_print(cp);
+ egp_print(cp, len);
break;
case IPPROTO_OSPF:
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