* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
+/* \summary: Cisco HDLC printer */
+
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <tcpdump-stdinc.h>
+#include "netdissect-stdinc.h"
-#include "interface.h"
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h"
#include "chdlc.h"
+#include "nlpid.h"
static void chdlc_slarp_print(netdissect_options *, const u_char *, u_int);
/* Standard CHDLC printer */
-u_int
-chdlc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p)
+void
+chdlc_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;
-
- if (caplen < CHDLC_HDRLEN) {
- ND_PRINT((ndo, "[|chdlc]"));
- return (caplen);
- }
- return (chdlc_print(ndo, p,length));
+ ndo->ndo_protocol = "chdlc";
+ ND_TCHECK_LEN(p, CHDLC_HDRLEN);
+ ndo->ndo_ll_hdr_len += CHDLC_HDRLEN;
+ chdlc_print(ndo, p, h->len);
}
-u_int
-chdlc_print(netdissect_options *ndo, register const u_char *p, u_int length) {
+void
+chdlc_print(netdissect_options *ndo, const u_char *p, u_int length)
+{
u_int proto;
- proto = EXTRACT_16BITS(&p[2]);
+ ndo->ndo_protocol = "chdlc";
+ ND_ICHECK_U(length, <, CHDLC_HDRLEN);
+ proto = GET_BE_U_2(p + 2);
if (ndo->ndo_eflag) {
- ND_PRINT((ndo, "%s, ethertype %s (0x%04x), length %u: ",
- tok2str(chdlc_cast_values, "0x%02x", p[0]),
+ ND_PRINT("%s, ethertype %s (0x%04x), length %u: ",
+ tok2str(chdlc_cast_values, "0x%02x", GET_U_1(p)),
tok2str(ethertype_values, "Unknown", proto),
proto,
- length));
+ length);
}
length -= CHDLC_HDRLEN;
case ETHERTYPE_IP:
ip_print(ndo, p, length);
break;
-#ifdef INET6
case ETHERTYPE_IPV6:
ip6_print(ndo, p, length);
break;
-#endif
case CHDLC_TYPE_SLARP:
chdlc_slarp_print(ndo, p, length);
break;
-#if 0
- case CHDLC_TYPE_CDP:
- chdlc_cdp_print(p, length);
- break;
-#endif
case ETHERTYPE_MPLS:
case ETHERTYPE_MPLS_MULTI:
- mpls_print(p, length);
+ mpls_print(ndo, p, length);
break;
case ETHERTYPE_ISO:
/* is the fudge byte set ? lets verify by spotting ISO headers */
- if (*(p+1) == 0x81 ||
- *(p+1) == 0x82 ||
- *(p+1) == 0x83)
- isoclns_print(p+1, length-1, length-1);
+ ND_ICHECK_U(length, <, 2);
+ if (GET_U_1(p + 1) == NLPID_CLNP ||
+ GET_U_1(p + 1) == NLPID_ESIS ||
+ GET_U_1(p + 1) == NLPID_ISIS)
+ isoclns_print(ndo, p + 1, length - 1);
else
- isoclns_print(p, length, length);
+ isoclns_print(ndo, p, length);
break;
default:
if (!ndo->ndo_eflag)
- ND_PRINT((ndo, "unknown CHDLC protocol (0x%04x)", proto));
+ ND_PRINT("unknown CHDLC protocol (0x%04x)", proto);
break;
}
- return (CHDLC_HDRLEN);
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
}
/*
* The fixed-length portion of a SLARP packet.
*/
struct cisco_slarp {
- u_int8_t code[4];
+ nd_uint32_t code;
#define SLARP_REQUEST 0
#define SLARP_REPLY 1
#define SLARP_KEEPALIVE 2
union {
struct {
- u_int8_t addr[4];
- u_int8_t mask[4];
+ uint8_t addr[4];
+ uint8_t mask[4];
} addr;
struct {
- u_int8_t myseq[4];
- u_int8_t yourseq[4];
- u_int8_t rel[2];
+ nd_uint32_t myseq;
+ nd_uint32_t yourseq;
+ nd_uint16_t rel;
} keep;
} un;
};
const struct cisco_slarp *slarp;
u_int sec,min,hrs,days;
- ND_PRINT((ndo, "SLARP (length: %u), ",length));
- if (length < SLARP_MIN_LEN)
- goto trunc;
+ ndo->ndo_protocol = "chdlc_slarp";
+ ND_PRINT("SLARP");
+ ND_ICHECK_U(length, <, SLARP_MIN_LEN);
+ ND_PRINT(" (length: %u), ",length);
slarp = (const struct cisco_slarp *)cp;
- ND_TCHECK2(*slarp, SLARP_MIN_LEN);
- switch (EXTRACT_32BITS(&slarp->code)) {
+ ND_TCHECK_LEN(slarp, SLARP_MIN_LEN);
+ switch (GET_BE_U_4(slarp->code)) {
case SLARP_REQUEST:
- ND_PRINT((ndo, "request"));
+ ND_PRINT("request");
/*
* At least according to William "Chops" Westfield's
* message in
*
- * http://www.nethelp.no/net/cisco-hdlc.txt
+ * https://web.archive.org/web/20190725151313/www.nethelp.no/net/cisco-hdlc.txt
*
* the address and mask aren't used in requests -
* they're just zero.
*/
break;
case SLARP_REPLY:
- ND_PRINT((ndo, "reply %s/%s",
- ipaddr_string(&slarp->un.addr.addr),
- ipaddr_string(&slarp->un.addr.mask)));
+ ND_PRINT("reply %s/%s",
+ GET_IPADDR_STRING(slarp->un.addr.addr),
+ GET_IPADDR_STRING(slarp->un.addr.mask));
break;
case SLARP_KEEPALIVE:
- ND_PRINT((ndo, "keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x",
- EXTRACT_32BITS(&slarp->un.keep.myseq),
- EXTRACT_32BITS(&slarp->un.keep.yourseq),
- EXTRACT_16BITS(&slarp->un.keep.rel)));
+ ND_PRINT("keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x",
+ GET_BE_U_4(slarp->un.keep.myseq),
+ GET_BE_U_4(slarp->un.keep.yourseq),
+ GET_BE_U_2(slarp->un.keep.rel));
if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */
cp += SLARP_MIN_LEN;
- if (!ND_TTEST2(*cp, 4))
- goto trunc;
- sec = EXTRACT_32BITS(cp) / 1000;
+ sec = GET_BE_U_4(cp) / 1000;
min = sec / 60; sec -= min * 60;
hrs = min / 60; min -= hrs * 60;
days = hrs / 24; hrs -= days * 24;
- ND_PRINT((ndo, ", link uptime=%ud%uh%um%us",days,hrs,min,sec));
+ ND_PRINT(", link uptime=%ud%uh%um%us",days,hrs,min,sec);
}
break;
default:
- ND_PRINT((ndo, "0x%02x unknown", EXTRACT_32BITS(&slarp->code)));
+ ND_PRINT("0x%02x unknown", GET_BE_U_4(slarp->code));
if (ndo->ndo_vflag <= 1)
print_unknown_data(ndo,cp+4,"\n\t",length-4);
break;
}
if (SLARP_MAX_LEN < length && ndo->ndo_vflag)
- ND_PRINT((ndo, ", (trailing junk: %d bytes)", length - SLARP_MAX_LEN));
+ ND_PRINT(", (trailing junk: %u bytes)", length - SLARP_MAX_LEN);
if (ndo->ndo_vflag > 1)
print_unknown_data(ndo,cp+4,"\n\t",length-4);
return;
-trunc:
- ND_PRINT((ndo, "[|slarp]"));
+invalid:
+ nd_print_invalid(ndo);
}
-
-
-/*
- * Local Variables:
- * c-style: whitesmith
- * c-basic-offset: 8
- * End:
- */
projects / tcpdump / blobdiff