* 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.
+ *
*/
-#ifndef lint
-static const char rcsid[] =
-"@(#) $Header: /tcpdump/master/tcpdump/print-pppoe.c,v 1.14 2001-06-20 07:40:44 guy Exp $ (LBL)";
-#endif
+/* \summary: PPP-over-Ethernet (PPPoE) printer */
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-
-#include <netinet/in.h>
+#include "netdissect-stdinc.h"
-#include <stdio.h>
-#include <string.h>
+#include "netdissect-ctype.h"
-#include "interface.h"
-#include "addrtoname.h"
-#include "ppp.h"
-#include "ethertype.h"
-#include "ether.h"
-#include "extract.h" /* must come after interface.h */
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
/* Codes */
enum {
PPPOE_PADT = 0xa7
};
-static struct tok pppoecode2str[] = {
+static const struct tok pppoecode2str[] = {
{ PPPOE_PADI, "PADI" },
{ PPPOE_PADO, "PADO" },
{ PPPOE_PADR, "PADR" },
PPPOE_AC_COOKIE = 0x0104,
PPPOE_VENDOR = 0x0105,
PPPOE_RELAY_SID = 0x0110,
+ PPPOE_MAX_PAYLOAD = 0x0120,
PPPOE_SERVICE_NAME_ERROR = 0x0201,
PPPOE_AC_SYSTEM_ERROR = 0x0202,
PPPOE_GENERIC_ERROR = 0x0203
};
-static struct tok pppoetag2str[] = {
+static const struct tok pppoetag2str[] = {
{ PPPOE_EOL, "EOL" },
{ PPPOE_SERVICE_NAME, "Service-Name" },
{ PPPOE_AC_NAME, "AC-Name" },
{ PPPOE_AC_COOKIE, "AC-Cookie" },
{ PPPOE_VENDOR, "Vendor-Specific" },
{ PPPOE_RELAY_SID, "Relay-Session-ID" },
+ { PPPOE_MAX_PAYLOAD, "PPP-Max-Payload" },
{ PPPOE_SERVICE_NAME_ERROR, "Service-Name-Error" },
{ PPPOE_AC_SYSTEM_ERROR, "AC-System-Error" },
{ PPPOE_GENERIC_ERROR, "Generic-Error" },
};
#define PPPOE_HDRLEN 6
+#define MAXTAGPRINT 80
void
-pppoe_if_print(u_char *user, const struct pcap_pkthdr *h,
- register const u_char *p)
+pppoe_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;
-
- ts_print(&h->ts);
-
- /*
- * 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;
-
- pppoe_print(p, length);
+ ndo->ndo_protocol = "pppoe";
+ ndo->ndo_ll_hdr_len += pppoe_print(ndo, p, h->len);
}
-void
-pppoe_print(register const u_char *bp, u_int length)
+u_int
+pppoe_print(netdissect_options *ndo, const u_char *bp, u_int length)
{
- u_short pppoe_ver, pppoe_type, pppoe_code, pppoe_sessionid, pppoe_length;
+ uint16_t pppoe_ver, pppoe_type, pppoe_code, pppoe_sessionid;
+ u_int pppoe_length;
const u_char *pppoe_packet, *pppoe_payload;
- pppoe_packet = bp;
- if (pppoe_packet > snapend) {
- printf("[|pppoe]");
- return;
+ ndo->ndo_protocol = "pppoe";
+ if (length < PPPOE_HDRLEN) {
+ ND_PRINT(" (length %u < %u)", length, PPPOE_HDRLEN);
+ goto invalid;
}
-
- pppoe_ver = (pppoe_packet[0] & 0xF0) >> 4;
- pppoe_type = (pppoe_packet[0] & 0x0F);
- pppoe_code = pppoe_packet[1];
- pppoe_sessionid = EXTRACT_16BITS(pppoe_packet + 2);
- pppoe_length = EXTRACT_16BITS(pppoe_packet + 4);
+ length -= PPPOE_HDRLEN;
+ pppoe_packet = bp;
+ ND_TCHECK_LEN(pppoe_packet, PPPOE_HDRLEN);
+ pppoe_ver = (GET_U_1(pppoe_packet) & 0xF0) >> 4;
+ pppoe_type = (GET_U_1(pppoe_packet) & 0x0F);
+ pppoe_code = GET_U_1(pppoe_packet + 1);
+ pppoe_sessionid = GET_BE_U_2(pppoe_packet + 2);
+ pppoe_length = GET_BE_U_2(pppoe_packet + 4);
pppoe_payload = pppoe_packet + PPPOE_HDRLEN;
- if (snapend < pppoe_payload) {
- printf(" truncated PPPoE");
- return;
- }
-
if (pppoe_ver != 1) {
- printf(" [ver %d]",pppoe_ver);
+ ND_PRINT(" [ver %u]",pppoe_ver);
}
if (pppoe_type != 1) {
- printf(" [type %d]",pppoe_type);
+ ND_PRINT(" [type %u]",pppoe_type);
}
- printf("PPPoE %s", tok2str(pppoecode2str, "PAD-%x", pppoe_code));
+ ND_PRINT("PPPoE %s", tok2str(pppoecode2str, "PAD-%x", pppoe_code));
if (pppoe_code == PPPOE_PADI && pppoe_length > 1484 - PPPOE_HDRLEN) {
- printf(" [len %d!]",pppoe_length);
+ ND_PRINT(" [len %u!]",pppoe_length);
}
- if (pppoe_sessionid) {
- printf(" [ses 0x%x]", pppoe_sessionid);
+ if (pppoe_length > length) {
+ ND_PRINT(" [len %u > %u!]", pppoe_length, length);
+ pppoe_length = length;
}
-
- if (pppoe_payload + pppoe_length < snapend) {
-#if 0
- const u_char *x = pppoe_payload + pppoe_length;
- printf(" [length %d (%d extra bytes)]",
- pppoe_length, snapend - pppoe_payload - pppoe_length);
- default_print(x, snapend - x);
-#endif
- snapend = pppoe_payload+pppoe_length;
+ if (pppoe_sessionid) {
+ ND_PRINT(" [ses 0x%x]", pppoe_sessionid);
}
if (pppoe_code) {
/*
* loop invariant:
- * p points to next tag,
+ * p points to current tag,
* tag_type is previous tag or 0xffff for first iteration
*/
- while (tag_type && p + 4 < pppoe_payload + length &&
- p + 4 < snapend) {
- tag_type = EXTRACT_16BITS(p);
- tag_len = EXTRACT_16BITS(p + 2);
+ while (tag_type && p < pppoe_payload + pppoe_length) {
+ tag_type = GET_BE_U_2(p);
+ tag_len = GET_BE_U_2(p + 2);
p += 4;
/* p points to tag_value */
if (tag_len) {
- int isascii = 1;
- const u_char *v = p;
- u_short l;
-
- for (v = p; v < p + tag_len; v++)
- if (*v >= 127 || *v < 32) {
- isascii = 0;
- break;
+ unsigned ascii_count = 0, garbage_count = 0;
+ const u_char *v;
+ char tag_str[MAXTAGPRINT];
+ unsigned tag_str_len = 0;
+
+ /* TODO print UTF-8 decoded text */
+ ND_TCHECK_LEN(p, tag_len);
+ for (v = p; v < p + tag_len && tag_str_len < MAXTAGPRINT-1; v++)
+ if (ND_ASCII_ISPRINT(GET_U_1(v))) {
+ tag_str[tag_str_len++] = GET_U_1(v);
+ ascii_count++;
+ } else {
+ tag_str[tag_str_len++] = '.';
+ garbage_count++;
+ }
+ tag_str[tag_str_len] = 0;
+
+ if (ascii_count > garbage_count) {
+ ND_PRINT(" [%s \"%*.*s\"]",
+ tok2str(pppoetag2str, "TAG-0x%x", tag_type),
+ (int)tag_str_len,
+ (int)tag_str_len,
+ tag_str);
+ } else {
+ /* Print hex, not fast to abuse printf but this doesn't get used much */
+ ND_PRINT(" [%s 0x", tok2str(pppoetag2str, "TAG-0x%x", tag_type));
+ for (v=p; v<p+tag_len; v++) {
+ ND_PRINT("%02X", GET_U_1(v));
}
+ ND_PRINT("]");
+ }
+
- /* TODO print UTF8 decoded text */
- if (isascii) {
- l = (tag_len < 80 ? tag_len : 80);
- printf(" [%s \"%*.*s\"]",
- tok2str(pppoetag2str, "TAG-0x%x", tag_type),
- l, l, p);
- } else
- printf(" [%s UTF8]",
- tok2str(pppoetag2str, "TAG-0x%x", tag_type));
} else
- printf(" [%s]", tok2str(pppoetag2str,
+ ND_PRINT(" [%s]", tok2str(pppoetag2str,
"TAG-0x%x", tag_type));
p += tag_len;
/* p points to next tag */
}
+ return PPPOE_HDRLEN;
} else {
- printf(" ");
- ppp_print(pppoe_payload, pppoe_length);
+ /* PPPoE data */
+ ND_PRINT(" ");
+ return (PPPOE_HDRLEN + ppp_print(ndo, pppoe_payload, pppoe_length));
}
- return;
+ /* NOTREACHED */
+
+invalid:
+ nd_print_invalid(ndo);
+ return 0;
}
projects / tcpdump / blobdiff