323 lines
7.4 KiB
C
323 lines
7.4 KiB
C
/*
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* Decode and print Zephyr packets.
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*
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* http://web.mit.edu/zephyr/doc/protocol
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*
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* Copyright (c) 2001 Nickolai Zeldovich <kolya@MIT.EDU>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code
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* distributions retain the above copyright notice and this paragraph
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* in its entirety, and (2) distributions including binary code include
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* the above copyright notice and this paragraph in its entirety in
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* the documentation or other materials provided with the distribution.
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* The name of the author(s) may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE.
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/print-zephyr.c,v 1.10 2007-08-09 18:47:27 hannes Exp $";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "interface.h"
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struct z_packet {
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char *version;
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int numfields;
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int kind;
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char *uid;
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int port;
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int auth;
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int authlen;
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char *authdata;
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char *class;
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char *inst;
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char *opcode;
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char *sender;
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const char *recipient;
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char *format;
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int cksum;
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int multi;
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char *multi_uid;
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/* Other fields follow here.. */
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};
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enum z_packet_type {
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Z_PACKET_UNSAFE = 0,
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Z_PACKET_UNACKED,
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Z_PACKET_ACKED,
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Z_PACKET_HMACK,
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Z_PACKET_HMCTL,
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Z_PACKET_SERVACK,
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Z_PACKET_SERVNAK,
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Z_PACKET_CLIENTACK,
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Z_PACKET_STAT
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};
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static struct tok z_types[] = {
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{ Z_PACKET_UNSAFE, "unsafe" },
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{ Z_PACKET_UNACKED, "unacked" },
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{ Z_PACKET_ACKED, "acked" },
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{ Z_PACKET_HMACK, "hm-ack" },
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{ Z_PACKET_HMCTL, "hm-ctl" },
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{ Z_PACKET_SERVACK, "serv-ack" },
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{ Z_PACKET_SERVNAK, "serv-nak" },
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{ Z_PACKET_CLIENTACK, "client-ack" },
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{ Z_PACKET_STAT, "stat" }
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};
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char z_buf[256];
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static char *
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parse_field(char **pptr, int *len)
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{
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char *s;
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if (*len <= 0 || !pptr || !*pptr)
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return NULL;
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if (*pptr > (char *) snapend)
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return NULL;
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s = *pptr;
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while (*pptr <= (char *) snapend && *len >= 0 && **pptr) {
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(*pptr)++;
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(*len)--;
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}
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(*pptr)++;
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(*len)--;
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if (*len < 0 || *pptr > (char *) snapend)
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return NULL;
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return s;
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}
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static const char *
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z_triple(char *class, char *inst, const char *recipient)
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{
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if (!*recipient)
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recipient = "*";
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snprintf(z_buf, sizeof(z_buf), "<%s,%s,%s>", class, inst, recipient);
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z_buf[sizeof(z_buf)-1] = '\0';
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return z_buf;
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}
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static const char *
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str_to_lower(char *string)
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{
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strncpy(z_buf, string, sizeof(z_buf));
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z_buf[sizeof(z_buf)-1] = '\0';
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string = z_buf;
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while (*string) {
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*string = tolower((unsigned char)(*string));
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string++;
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}
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return z_buf;
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}
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void
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zephyr_print(const u_char *cp, int length)
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{
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struct z_packet z;
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char *parse = (char *) cp;
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int parselen = length;
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char *s;
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int lose = 0;
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/* squelch compiler warnings */
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z.kind = 0;
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z.class = 0;
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z.inst = 0;
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z.opcode = 0;
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z.sender = 0;
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z.recipient = 0;
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#define PARSE_STRING \
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s = parse_field(&parse, &parselen); \
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if (!s) lose = 1;
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#define PARSE_FIELD_INT(field) \
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PARSE_STRING \
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if (!lose) field = strtol(s, 0, 16);
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#define PARSE_FIELD_STR(field) \
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PARSE_STRING \
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if (!lose) field = s;
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PARSE_FIELD_STR(z.version);
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if (lose) return;
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if (strncmp(z.version, "ZEPH", 4))
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return;
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PARSE_FIELD_INT(z.numfields);
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PARSE_FIELD_INT(z.kind);
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PARSE_FIELD_STR(z.uid);
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PARSE_FIELD_INT(z.port);
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PARSE_FIELD_INT(z.auth);
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PARSE_FIELD_INT(z.authlen);
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PARSE_FIELD_STR(z.authdata);
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PARSE_FIELD_STR(z.class);
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PARSE_FIELD_STR(z.inst);
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PARSE_FIELD_STR(z.opcode);
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PARSE_FIELD_STR(z.sender);
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PARSE_FIELD_STR(z.recipient);
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PARSE_FIELD_STR(z.format);
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PARSE_FIELD_INT(z.cksum);
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PARSE_FIELD_INT(z.multi);
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PARSE_FIELD_STR(z.multi_uid);
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if (lose) {
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printf(" [|zephyr] (%d)", length);
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return;
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}
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printf(" zephyr");
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if (strncmp(z.version+4, "0.2", 3)) {
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printf(" v%s", z.version+4);
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return;
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}
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printf(" %s", tok2str(z_types, "type %d", z.kind));
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if (z.kind == Z_PACKET_SERVACK) {
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/* Initialization to silence warnings */
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char *ackdata = NULL;
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PARSE_FIELD_STR(ackdata);
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if (!lose && strcmp(ackdata, "SENT"))
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printf("/%s", str_to_lower(ackdata));
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}
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if (*z.sender) printf(" %s", z.sender);
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if (!strcmp(z.class, "USER_LOCATE")) {
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if (!strcmp(z.opcode, "USER_HIDE"))
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printf(" hide");
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else if (!strcmp(z.opcode, "USER_UNHIDE"))
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printf(" unhide");
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else
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printf(" locate %s", z.inst);
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return;
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}
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if (!strcmp(z.class, "ZEPHYR_ADMIN")) {
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printf(" zephyr-admin %s", str_to_lower(z.opcode));
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return;
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}
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if (!strcmp(z.class, "ZEPHYR_CTL")) {
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if (!strcmp(z.inst, "CLIENT")) {
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if (!strcmp(z.opcode, "SUBSCRIBE") ||
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!strcmp(z.opcode, "SUBSCRIBE_NODEFS") ||
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!strcmp(z.opcode, "UNSUBSCRIBE")) {
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printf(" %ssub%s", strcmp(z.opcode, "SUBSCRIBE") ? "un" : "",
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strcmp(z.opcode, "SUBSCRIBE_NODEFS") ? "" :
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"-nodefs");
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if (z.kind != Z_PACKET_SERVACK) {
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/* Initialization to silence warnings */
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char *c = NULL, *i = NULL, *r = NULL;
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PARSE_FIELD_STR(c);
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PARSE_FIELD_STR(i);
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PARSE_FIELD_STR(r);
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if (!lose) printf(" %s", z_triple(c, i, r));
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}
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return;
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}
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if (!strcmp(z.opcode, "GIMME")) {
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printf(" ret");
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return;
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}
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if (!strcmp(z.opcode, "GIMMEDEFS")) {
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printf(" gimme-defs");
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return;
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}
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if (!strcmp(z.opcode, "CLEARSUB")) {
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printf(" clear-subs");
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return;
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}
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printf(" %s", str_to_lower(z.opcode));
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return;
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}
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if (!strcmp(z.inst, "HM")) {
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printf(" %s", str_to_lower(z.opcode));
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return;
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}
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if (!strcmp(z.inst, "REALM")) {
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if (!strcmp(z.opcode, "ADD_SUBSCRIBE"))
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printf(" realm add-subs");
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if (!strcmp(z.opcode, "REQ_SUBSCRIBE"))
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printf(" realm req-subs");
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if (!strcmp(z.opcode, "RLM_SUBSCRIBE"))
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printf(" realm rlm-sub");
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if (!strcmp(z.opcode, "RLM_UNSUBSCRIBE"))
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printf(" realm rlm-unsub");
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return;
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}
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}
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if (!strcmp(z.class, "HM_CTL")) {
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printf(" hm_ctl %s", str_to_lower(z.inst));
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printf(" %s", str_to_lower(z.opcode));
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return;
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}
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if (!strcmp(z.class, "HM_STAT")) {
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if (!strcmp(z.inst, "HMST_CLIENT") && !strcmp(z.opcode, "GIMMESTATS")) {
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printf(" get-client-stats");
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return;
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}
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}
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if (!strcmp(z.class, "WG_CTL")) {
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printf(" wg_ctl %s", str_to_lower(z.inst));
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printf(" %s", str_to_lower(z.opcode));
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return;
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}
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if (!strcmp(z.class, "LOGIN")) {
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if (!strcmp(z.opcode, "USER_FLUSH")) {
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printf(" flush_locs");
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return;
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}
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if (!strcmp(z.opcode, "NONE") ||
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!strcmp(z.opcode, "OPSTAFF") ||
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!strcmp(z.opcode, "REALM-VISIBLE") ||
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!strcmp(z.opcode, "REALM-ANNOUNCED") ||
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!strcmp(z.opcode, "NET-VISIBLE") ||
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!strcmp(z.opcode, "NET-ANNOUNCED")) {
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printf(" set-exposure %s", str_to_lower(z.opcode));
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return;
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}
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}
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if (!*z.recipient)
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z.recipient = "*";
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printf(" to %s", z_triple(z.class, z.inst, z.recipient));
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if (*z.opcode)
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printf(" op %s", z.opcode);
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return;
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}
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