X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/69cb46af9119e8b5554bcc4bf1bf36f39cb82131..0f328b4aa16b0b47f05a85c440ce1d07719e3cac:/print-ip.c

diff --git a/print-ip.c b/print-ip.c
index bdead1fa..b1deb78a 100644
--- a/print-ip.c
+++ b/print-ip.c
@@ -19,17 +19,19 @@
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
+/* \summary: IP printer */
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
 
 #include <string.h>
 
-#include "interface.h"
+#include "netdissect.h"
 #include "addrtoname.h"
-#include "extract.h"			/* must come after interface.h */
+#include "extract.h"
 
 #include "ip.h"
 #include "ipproto.h"
@@ -52,7 +54,7 @@ static const struct tok ip_option_values[] = {
 /*
  * print the recorded route in an IP RR, LSRR or SSRR option.
  */
-static void
+static int
 ip_printroute(netdissect_options *ndo,
               register const u_char *cp, u_int length)
 {
@@ -61,19 +63,25 @@ ip_printroute(netdissect_options *ndo,
 
 	if (length < 3) {
 		ND_PRINT((ndo, " [bad length %u]", length));
-		return;
+		return (0);
 	}
 	if ((length + 1) & 3)
 		ND_PRINT((ndo, " [bad length %u]", length));
-	ptr = cp[2] - 1;
+	ND_TCHECK_1(cp + 2);
+	ptr = EXTRACT_U_1(cp + 2) - 1;
 	if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
-		ND_PRINT((ndo, " [bad ptr %u]", cp[2]));
+		ND_PRINT((ndo, " [bad ptr %u]", EXTRACT_U_1(cp + 2)));
 
 	for (len = 3; len < length; len += 4) {
-		ND_PRINT((ndo, " %s", ipaddr_string(ndo, &cp[len])));
+		ND_TCHECK_4(cp + len);
+		ND_PRINT((ndo, " %s", ipaddr_string(ndo, cp + len)));
 		if (ptr > len)
 			ND_PRINT((ndo, ","));
 	}
+	return (0);
+
+trunc:
+	return (-1);
 }
 
 /*
@@ -98,15 +106,15 @@ ip_finddst(netdissect_options *ndo,
 	for (; length > 0; cp += len, length -= len) {
 		int tt;
 
-		ND_TCHECK(*cp);
-		tt = *cp;
+		ND_TCHECK_1(cp);
+		tt = EXTRACT_U_1(cp);
 		if (tt == IPOPT_EOL)
 			break;
 		else if (tt == IPOPT_NOP)
 			len = 1;
 		else {
-			ND_TCHECK(cp[1]);
-			len = cp[1];
+			ND_TCHECK_1(cp + 1);
+			len = EXTRACT_U_1(cp + 1);
 			if (len < 2)
 				break;
 		}
@@ -122,7 +130,7 @@ ip_finddst(netdissect_options *ndo,
 		}
 	}
 trunc:
-	UNALIGNED_MEMCPY(&retval, &ip->ip_dst.s_addr, sizeof(uint32_t));
+	UNALIGNED_MEMCPY(&retval, &ip->ip_dst, sizeof(uint32_t));
 	return retval;
 }
 
@@ -147,9 +155,9 @@ nextproto4_cksum(netdissect_options *ndo,
 	ph.len = htons((uint16_t)len);
 	ph.mbz = 0;
 	ph.proto = next_proto;
-	UNALIGNED_MEMCPY(&ph.src, &ip->ip_src.s_addr, sizeof(uint32_t));
+	UNALIGNED_MEMCPY(&ph.src, &ip->ip_src, sizeof(uint32_t));
 	if (IP_HL(ip) == 5)
-		UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst.s_addr, sizeof(uint32_t));
+		UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst, sizeof(uint32_t));
 	else
 		ph.dst = ip_finddst(ndo, ip);
 
@@ -160,7 +168,7 @@ nextproto4_cksum(netdissect_options *ndo,
 	return (in_cksum(vec, 2));
 }
 
-static void
+static int
 ip_printts(netdissect_options *ndo,
            register const u_char *cp, u_int length)
 {
@@ -171,17 +179,20 @@ ip_printts(netdissect_options *ndo,
 
 	if (length < 4) {
 		ND_PRINT((ndo, "[bad length %u]", length));
-		return;
+		return (0);
 	}
 	ND_PRINT((ndo, " TS{"));
-	hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
+	ND_TCHECK_1(cp + 3);
+	hoplen = ((EXTRACT_U_1(cp + 3) & 0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
 	if ((length - 4) & (hoplen-1))
 		ND_PRINT((ndo, "[bad length %u]", length));
-	ptr = cp[2] - 1;
+	ND_TCHECK_1(cp + 2);
+	ptr = EXTRACT_U_1(cp + 2) - 1;
 	len = 0;
 	if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
-		ND_PRINT((ndo, "[bad ptr %u]", cp[2]));
-	switch (cp[3]&0xF) {
+		ND_PRINT((ndo, "[bad ptr %u]", EXTRACT_U_1(cp + 2)));
+	ND_TCHECK_1(cp + 3);
+	switch (EXTRACT_U_1(cp + 3)&0xF) {
 	case IPOPT_TS_TSONLY:
 		ND_PRINT((ndo, "TSONLY"));
 		break;
@@ -201,7 +212,7 @@ ip_printts(netdissect_options *ndo,
 		ND_PRINT((ndo, "PRESPEC"));
 		break;
 	default:
-		ND_PRINT((ndo, "[bad ts type %d]", cp[3]&0xF));
+		ND_PRINT((ndo, "[bad ts type %d]", EXTRACT_U_1(cp + 3)&0xF));
 		goto done;
 	}
 
@@ -209,18 +220,23 @@ ip_printts(netdissect_options *ndo,
 	for (len = 4; len < length; len += hoplen) {
 		if (ptr == len)
 			type = " ^ ";
-		ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
-		       hoplen!=8 ? "" : ipaddr_string(ndo, &cp[len])));
+		ND_TCHECK2(cp[len], hoplen);
+		ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_BE_U_4(cp + len + hoplen - 4),
+			  hoplen!=8 ? "" : ipaddr_string(ndo, cp + len)));
 		type = " ";
 	}
 
 done:
 	ND_PRINT((ndo, "%s", ptr == len ? " ^ " : ""));
 
-	if (cp[3]>>4)
-		ND_PRINT((ndo, " [%d hops not recorded]} ", cp[3]>>4));
+	if (EXTRACT_U_1(cp + 3) >> 4)
+		ND_PRINT((ndo, " [%d hops not recorded]} ", EXTRACT_U_1(cp + 3)>>4));
 	else
 		ND_PRINT((ndo, "}"));
+	return (0);
+
+trunc:
+	return (-1);
 }
 
 /*
@@ -239,8 +255,8 @@ ip_optprint(netdissect_options *ndo,
 		ND_PRINT((ndo, "%s", sep));
 		sep = ",";
 
-		ND_TCHECK(*cp);
-		option_code = *cp;
+		ND_TCHECK_1(cp);
+		option_code = EXTRACT_U_1(cp);
 
 		ND_PRINT((ndo, "%s",
 		          tok2str(ip_option_values,"unknown %u",option_code)));
@@ -250,8 +266,8 @@ ip_optprint(netdissect_options *ndo,
 			option_len = 1;
 
 		else {
-			ND_TCHECK(cp[1]);
-			option_len = cp[1];
+			ND_TCHECK_1(cp + 1);
+			option_len = EXTRACT_U_1(cp + 1);
 			if (option_len < 2) {
 				ND_PRINT((ndo, " [bad length %u]", option_len));
 				return;
@@ -270,13 +286,15 @@ ip_optprint(netdissect_options *ndo,
 			return;
 
 		case IPOPT_TS:
-			ip_printts(ndo, cp, option_len);
+			if (ip_printts(ndo, cp, option_len) == -1)
+				goto trunc;
 			break;
 
 		case IPOPT_RR:       /* fall through */
 		case IPOPT_SSRR:
 		case IPOPT_LSRR:
-			ip_printroute(ndo, cp, option_len);
+			if (ip_printroute(ndo, cp, option_len) == -1)
+				goto trunc;
 			break;
 
 		case IPOPT_RA:
@@ -284,9 +302,9 @@ ip_optprint(netdissect_options *ndo,
 				ND_PRINT((ndo, " [bad length %u]", option_len));
 				break;
 			}
-			ND_TCHECK(cp[3]);
-			if (EXTRACT_16BITS(&cp[2]) != 0)
-				ND_PRINT((ndo, " value %u", EXTRACT_16BITS(&cp[2])));
+			ND_TCHECK_1(cp + 3);
+			if (EXTRACT_BE_U_2(cp + 2) != 0)
+				ND_PRINT((ndo, " value %u", EXTRACT_BE_U_2(cp + 2)));
 			break;
 
 		case IPOPT_NOP:       /* nothing to print - fall through */
@@ -322,14 +340,17 @@ static void
 ip_print_demux(netdissect_options *ndo,
 	       struct ip_print_demux_state *ipds)
 {
-	struct protoent *proto;
-	struct cksum_vec vec[1];
+	const char *p_name;
 
 again:
 	switch (ipds->nh) {
 
 	case IPPROTO_AH:
-		ipds->nh = *ipds->cp;
+		if (!ND_TTEST(*ipds->cp)) {
+			ND_PRINT((ndo, "[|AH]"));
+			break;
+		}
+		ipds->nh = EXTRACT_U_1(ipds->cp);
 		ipds->advance = ah_print(ndo, ipds->cp);
 		if (ipds->advance <= 0)
 			break;
@@ -339,7 +360,7 @@ again:
 
 	case IPPROTO_ESP:
 	{
-		int enh, padlen;
+		u_int enh, padlen;
 		ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
 				    (const u_char *)ipds->ip,
 				    &enh, &padlen);
@@ -353,14 +374,14 @@ again:
 
 	case IPPROTO_IPCOMP:
 	{
-		int enh;
-		ipds->advance = ipcomp_print(ndo, ipds->cp, &enh);
-		if (ipds->advance <= 0)
-			break;
-		ipds->cp += ipds->advance;
-		ipds->len -= ipds->advance;
-		ipds->nh = enh & 0xff;
-		goto again;
+		ipcomp_print(ndo, ipds->cp);
+		/*
+		 * Either this has decompressed the payload and
+		 * printed it, in which case there's nothing more
+		 * to do, or it hasn't, in which case there's
+		 * nothing more to do.
+		 */
+		break;
 	}
 
 	case IPPROTO_SCTP:
@@ -454,9 +475,7 @@ again:
 		break;
 
 	case IPPROTO_PIM:
-		vec[0].ptr = ipds->cp;
-		vec[0].len = ipds->len;
-		pim_print(ndo, ipds->cp, ipds->len, in_cksum(vec, 1));
+		pim_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
 		break;
 
 	case IPPROTO_VRRP:
@@ -465,14 +484,16 @@ again:
 				ND_PRINT((ndo, "carp %s > %s: ",
 					     ipaddr_string(ndo, &ipds->ip->ip_src),
 					     ipaddr_string(ndo, &ipds->ip->ip_dst)));
-			carp_print(ndo, ipds->cp, ipds->len, ipds->ip->ip_ttl);
+			carp_print(ndo, ipds->cp, ipds->len,
+				EXTRACT_U_1(ipds->ip->ip_ttl));
 		} else {
 			if (ndo->ndo_vflag)
 				ND_PRINT((ndo, "vrrp %s > %s: ",
 					     ipaddr_string(ndo, &ipds->ip->ip_src),
 					     ipaddr_string(ndo, &ipds->ip->ip_dst)));
 			vrrp_print(ndo, ipds->cp, ipds->len,
-				(const u_char *)ipds->ip, ipds->ip->ip_ttl);
+				(const u_char *)ipds->ip,
+				EXTRACT_U_1(ipds->ip->ip_ttl));
 		}
 		break;
 
@@ -481,8 +502,8 @@ again:
 		break;
 
 	default:
-		if (ndo->ndo_nflag==0 && (proto = getprotobynumber(ipds->nh)) != NULL)
-			ND_PRINT((ndo, " %s", proto->p_name));
+		if (ndo->ndo_nflag==0 && (p_name = netdb_protoname(ipds->nh)) != NULL)
+			ND_PRINT((ndo, " %s", p_name));
 		else
 			ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
 		ND_PRINT((ndo, " %d", ipds->len));
@@ -522,18 +543,20 @@ ip_print(netdissect_options *ndo,
 	const u_char *ipend;
 	u_int hlen;
 	struct cksum_vec vec[1];
+	uint8_t ip_tos, ip_ttl, ip_proto;
 	uint16_t sum, ip_sum;
-	struct protoent *proto;
+	const char *p_name;
 
 	ipds->ip = (const struct ip *)bp;
 	ND_TCHECK(ipds->ip->ip_vhl);
-	if (IP_V(ipds->ip) != 4) { /* print version if != 4 */
+	if (IP_V(ipds->ip) != 4) { /* print version and fail if != 4 */
 	    if (IP_V(ipds->ip) == 6)
 	      ND_PRINT((ndo, "IP6, wrong link-layer encapsulation "));
 	    else
 	      ND_PRINT((ndo, "IP%u ", IP_V(ipds->ip)));
+	    return;
 	}
-	else if (!ndo->ndo_eflag)
+	if (!ndo->ndo_eflag)
 		ND_PRINT((ndo, "IP "));
 
 	ND_TCHECK(*ipds->ip);
@@ -547,7 +570,7 @@ ip_print(netdissect_options *ndo,
 		return;
 	}
 
-	ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len);
+	ipds->len = EXTRACT_BE_U_2(&ipds->ip->ip_len);
 	if (length < ipds->len)
 		ND_PRINT((ndo, "truncated-ip - %u bytes missing! ",
 			ipds->len - length));
@@ -576,41 +599,49 @@ ip_print(netdissect_options *ndo,
 
 	ipds->len -= hlen;
 
-	ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
+	ipds->off = EXTRACT_BE_U_2(&ipds->ip->ip_off);
+
+        ip_proto = EXTRACT_U_1(ipds->ip->ip_p);
 
         if (ndo->ndo_vflag) {
-            ND_PRINT((ndo, "(tos 0x%x", (int)ipds->ip->ip_tos));
+            ip_tos = EXTRACT_U_1(ipds->ip->ip_tos);
+            ND_PRINT((ndo, "(tos 0x%x", ip_tos));
             /* ECN bits */
-            if (ipds->ip->ip_tos & 0x03) {
-                switch (ipds->ip->ip_tos & 0x03) {
-                case 1:
-                    ND_PRINT((ndo, ",ECT(1)"));
-                    break;
-                case 2:
-                    ND_PRINT((ndo, ",ECT(0)"));
-                    break;
-                case 3:
-                    ND_PRINT((ndo, ",CE"));
-                }
+            switch (ip_tos & 0x03) {
+
+            case 0:
+                break;
+
+            case 1:
+                ND_PRINT((ndo, ",ECT(1)"));
+                break;
+
+            case 2:
+                ND_PRINT((ndo, ",ECT(0)"));
+                break;
+
+            case 3:
+                ND_PRINT((ndo, ",CE"));
+                break;
             }
 
-            if (ipds->ip->ip_ttl >= 1)
-                ND_PRINT((ndo, ", ttl %u", ipds->ip->ip_ttl));
+            ip_ttl = EXTRACT_U_1(ipds->ip->ip_ttl);
+            if (ip_ttl >= 1)
+                ND_PRINT((ndo, ", ttl %u", ip_ttl));
 
 	    /*
 	     * for the firewall guys, print id, offset.
              * On all but the last stick a "+" in the flags portion.
 	     * For unfragmented datagrams, note the don't fragment flag.
 	     */
-
 	    ND_PRINT((ndo, ", id %u, offset %u, flags [%s], proto %s (%u)",
-                         EXTRACT_16BITS(&ipds->ip->ip_id),
+                         EXTRACT_BE_U_2(&ipds->ip->ip_id),
                          (ipds->off & 0x1fff) * 8,
                          bittok2str(ip_frag_values, "none", ipds->off&0xe000),
-                         tok2str(ipproto_values,"unknown",ipds->ip->ip_p),
-                         ipds->ip->ip_p));
+                         tok2str(ipproto_values, "unknown", ip_proto),
+                         ip_proto));
 
-            ND_PRINT((ndo, ", length %u", EXTRACT_16BITS(&ipds->ip->ip_len)));
+            ND_PRINT((ndo, ", length %u", EXTRACT_BE_U_2(ipds->ip->ip_len)));
 
             if ((hlen - sizeof(struct ip)) > 0) {
                 ND_PRINT((ndo, ", options ("));
@@ -623,13 +654,13 @@ ip_print(netdissect_options *ndo,
 	        vec[0].len = hlen;
 	        sum = in_cksum(vec, 1);
 		if (sum != 0) {
-		    ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum);
+		    ip_sum = EXTRACT_BE_U_2(ipds->ip->ip_sum);
 		    ND_PRINT((ndo, ", bad cksum %x (->%x)!", ip_sum,
 			     in_cksum_shouldbe(ip_sum, sum)));
 		}
 	    }
 
-		ND_PRINT((ndo, ")\n    "));
+	    ND_PRINT((ndo, ")\n    "));
 	}
 
 	/*
@@ -638,7 +669,7 @@ ip_print(netdissect_options *ndo,
 	 */
 	if ((ipds->off & 0x1fff) == 0) {
 		ipds->cp = (const u_char *)ipds->ip + hlen;
-		ipds->nh = ipds->ip->ip_p;
+		ipds->nh = EXTRACT_U_1(ipds->ip->ip_p);
 
 		if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
 		    ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
@@ -648,22 +679,24 @@ ip_print(netdissect_options *ndo,
 		}
 		ip_print_demux(ndo, ipds);
 	} else {
-	    /* Ultra quiet now means that all this stuff should be suppressed */
-	    if (ndo->ndo_qflag > 1) return;
+		/*
+		 * Ultra quiet now means that all this stuff should be
+		 * suppressed.
+		 */
+		if (ndo->ndo_qflag > 1)
+			return;
 
-	    /*
-	     * if this isn't the first frag, we're missing the
-	     * next level protocol header.  print the ip addr
-	     * and the protocol.
-	     */
-		if (ipds->off & 0x1fff) {
-			ND_PRINT((ndo, "%s > %s:", ipaddr_string(ndo, &ipds->ip->ip_src),
-			          ipaddr_string(ndo, &ipds->ip->ip_dst)));
-			if (!ndo->ndo_nflag && (proto = getprotobynumber(ipds->ip->ip_p)) != NULL)
-				ND_PRINT((ndo, " %s", proto->p_name));
-			else
-				ND_PRINT((ndo, " ip-proto-%d", ipds->ip->ip_p));
-		}
+		/*
+		 * This isn't the first frag, so we're missing the
+		 * next level protocol header.  print the ip addr
+		 * and the protocol.
+		 */
+		ND_PRINT((ndo, "%s > %s:", ipaddr_string(ndo, &ipds->ip->ip_src),
+		          ipaddr_string(ndo, &ipds->ip->ip_dst)));
+		if (!ndo->ndo_nflag && (p_name = netdb_protoname(ip_proto)) != NULL)
+			ND_PRINT((ndo, " %s", p_name));
+		else
+			ND_PRINT((ndo, " ip-proto-%u", ip_proto));
 	}
 	return;
 
@@ -675,24 +708,28 @@ trunc:
 void
 ipN_print(netdissect_options *ndo, register const u_char *bp, register u_int length)
 {
-	struct ip hdr;
-
-	if (length < 4) {
+	if (length < 1) {
 		ND_PRINT((ndo, "truncated-ip %d", length));
 		return;
 	}
-	memcpy (&hdr, bp, 4);
-	switch (IP_V(&hdr)) {
-	case 4:
+
+	ND_TCHECK_1(bp);
+	switch (EXTRACT_U_1(bp) & 0xF0) {
+	case 0x40:
 		ip_print (ndo, bp, length);
-		return;
-	case 6:
+		break;
+	case 0x60:
 		ip6_print (ndo, bp, length);
-		return;
+		break;
 	default:
-		ND_PRINT((ndo, "unknown ip %d", IP_V(&hdr)));
-		return;
+		ND_PRINT((ndo, "unknown ip %u", (EXTRACT_U_1(bp) & 0xF0) >> 4));
+		break;
 	}
+	return;
+
+trunc:
+	ND_PRINT((ndo, "%s", tstr));
+	return;
 }
 
 /*