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/*
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* 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.
*
* Format and print trivial file transfer protocol packets.
*/
#include <unistd.h>
#include <stdlib.h>
#include <argus_compat.h>
#include <rabins.h>
#include <argus_util.h>
#include <argus_client.h>
#include <argus_main.h>
#include <argus_filter.h>
#include <signal.h>
#include <ctype.h>
#include <argus/extract.h>
extern u_char *snapend;
#include "interface.h"
extern char ArgusBuf[];
#ifdef SEGSIZE
#undef SEGSIZE /* SINIX sucks */
#endif
#include <arpa/tftp.h>
/* op code to string mapping */
static struct tok op2str[] = {
{ RRQ, "RRQ" }, /* read request */
{ WRQ, "WRQ" }, /* write request */
{ DATA, "DATA" }, /* data packet */
{ ACK, "ACK" }, /* acknowledgement */
{ ERROR, "ERROR" }, /* error code */
{ 0, NULL }
};
/* error code to string mapping */
static struct tok err2str[] = {
{ EUNDEF, "EUNDEF" }, /* not defined */
{ ENOTFOUND, "ENOTFOUND" }, /* file not found */
{ EACCESS, "EACCESS" }, /* access violation */
{ ENOSPACE, "ENOSPACE" }, /* disk full or allocation exceeded */
{ EBADOP, "EBADOP" }, /* illegal TFTP operation */
{ EBADID, "EBADID" }, /* unknown transfer ID */
{ EEXISTS, "EEXISTS" }, /* file already exists */
{ ENOUSER, "ENOUSER" }, /* no such user */
{ 0, NULL }
};
/*
* Print trivial file transfer program requests
*/
char *
tftp_print(register const u_char *bp, u_int length)
{
register const struct tftphdr *tp;
register const char *cp;
register const u_char *p;
register int opcode, i;
static char tstr[] = " [|tftp]";
tp = (const struct tftphdr *)bp;
/* Print length */
sprintf(&ArgusBuf[strlen(ArgusBuf)]," %d", length);
/* Print tftp request type */
TCHECK(tp->th_opcode);
opcode = EXTRACT_16BITS(&tp->th_opcode);
cp = tok2str(op2str, "tftp-#%d", opcode);
sprintf(&ArgusBuf[strlen(ArgusBuf)]," %s", cp);
/* Bail if bogus opcode */
if (*cp == 't')
return ArgusBuf;
switch (opcode) {
case RRQ:
case WRQ:
/*
* XXX Not all arpa/tftp.h's specify th_stuff as any
* array; use address of th_block instead
*/
#ifdef notdef
p = (u_char *)tp->th_stuff;
#else
p = (u_char *)&tp->th_block;
#endif
sprintf(&ArgusBuf[strlen(ArgusBuf)]," \"");
i = fn_print(p, snapend, ArgusBuf);
sprintf(&ArgusBuf[strlen(ArgusBuf)],"\"");
/* Print the mode and any options */
while ((p = (const u_char *)strchr((const char *)p, '\0')) != NULL) {
if (length <= (u_int)(p - (const u_char *)&tp->th_block))
break;
p++;
if (*p != '\0') {
sprintf(&ArgusBuf[strlen(ArgusBuf)]," ");
fn_print(p, snapend, ArgusBuf);
}
}
if (i)
goto trunc;
break;
case ACK:
case DATA:
TCHECK(tp->th_block);
sprintf(&ArgusBuf[strlen(ArgusBuf)]," block %d", EXTRACT_16BITS(&tp->th_block));
break;
case ERROR:
/* Print error code string */
TCHECK(tp->th_code);
sprintf(&ArgusBuf[strlen(ArgusBuf)]," %s ", tok2str(err2str, "tftp-err-#%d \"",
EXTRACT_16BITS(&tp->th_code)));
/* Print error message string */
i = fn_print((const u_char *)tp->th_data, snapend, ArgusBuf);
sprintf(&ArgusBuf[strlen(ArgusBuf)],"\"");
if (i)
goto trunc;
break;
default:
/* We shouldn't get here */
sprintf(&ArgusBuf[strlen(ArgusBuf)],"(unknown #%d)", opcode);
break;
}
return ArgusBuf;
trunc:
sprintf(&ArgusBuf[strlen(ArgusBuf)],"%s", tstr);
return ArgusBuf;
}
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