* 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.
*/
-#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-tftp.c,v 1.31 1999-11-21 09:37:03 fenner Exp $ (LBL)";
-#endif
+/* \summary: Trivial File Transfer Protocol (TFTP) printer */
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>
-#include <sys/param.h>
-#include <sys/time.h>
+#include "netdissect-stdinc.h"
-#include <netinet/in.h>
+#include "netdissect.h"
+#include "extract.h"
-#ifdef SEGSIZE
-#undef SEGSIZE /* SINIX sucks */
-#endif
-#include <arpa/tftp.h>
+/*
+ * Trivial File Transfer Protocol (IEN-133)
+ */
-#include <ctype.h>
-#include <stdio.h>
-#include <string.h>
+/*
+ * Packet types.
+ */
+#define RRQ 01 /* read request */
+#define WRQ 02 /* write request */
+#define DATA 03 /* data packet */
+#define ACK 04 /* acknowledgement */
+#define TFTP_ERROR 05 /* error code */
+#define OACK 06 /* option acknowledgement */
+
+/*
+ * Error codes.
+ */
+#define EUNDEF 0 /* not defined */
+#define ENOTFOUND 1 /* file not found */
+#define EACCESS 2 /* access violation */
+#define ENOSPACE 3 /* disk full or allocation exceeded */
+#define EBADOP 4 /* illegal TFTP operation */
+#define EBADID 5 /* unknown transfer ID */
+#define EEXISTS 6 /* file already exists */
+#define ENOUSER 7 /* no such user */
-#include "interface.h"
-#include "addrtoname.h"
/* op code to string mapping */
-static struct tok op2str[] = {
+static const struct tok op2str[] = {
{ RRQ, "RRQ" }, /* read request */
{ WRQ, "WRQ" }, /* write request */
{ DATA, "DATA" }, /* data packet */
{ ACK, "ACK" }, /* acknowledgement */
- { ERROR, "ERROR" }, /* error code */
+ { TFTP_ERROR, "ERROR" }, /* error code */
+ { OACK, "OACK" }, /* option acknowledgement */
{ 0, NULL }
};
/* error code to string mapping */
-static struct tok err2str[] = {
+static const struct tok err2str[] = {
{ EUNDEF, "EUNDEF" }, /* not defined */
{ ENOTFOUND, "ENOTFOUND" }, /* file not found */
{ EACCESS, "EACCESS" }, /* access violation */
* Print trivial file transfer program requests
*/
void
-tftp_print(register const u_char *bp, u_int length)
+tftp_print(netdissect_options *ndo,
+ 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]";
+ const char *cp;
+ u_int opcode;
+ u_int ui;
- tp = (const struct tftphdr *)bp;
+ ndo->ndo_protocol = "tftp";
+ /* Print protocol */
+ nd_print_protocol_caps(ndo);
/* Print length */
- printf(" %d", length);
+ ND_PRINT(", length %u", length);
/* Print tftp request type */
- TCHECK(tp->th_opcode);
- opcode = ntohs(tp->th_opcode);
- cp = tok2str(op2str, "tftp-#%d", opcode);
- printf(" %s", cp);
+ if (length < 2)
+ goto trunc;
+ opcode = GET_BE_U_2(bp);
+ cp = tok2str(op2str, "tftp-#%u", opcode);
+ ND_PRINT(", %s", cp);
/* Bail if bogus opcode */
if (*cp == 't')
return;
+ bp += 2;
+ length -= 2;
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
- fputs(" \"", stdout);
- i = fn_print(p, snapend);
- putchar('"');
- if (i)
+ if (length == 0)
+ goto trunc;
+ ND_PRINT(" ");
+ /* Print filename */
+ ND_PRINT("\"");
+ ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
+ ND_PRINT("\"");
+ if (ui == 0)
+ goto trunc;
+ bp += ui;
+ length -= ui;
+
+ /* Print the mode - RRQ and WRQ only */
+ if (length == 0)
+ goto trunc; /* no mode */
+ ND_PRINT(" ");
+ ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
+ if (ui == 0)
goto trunc;
+ bp += ui;
+ length -= ui;
+
+ /* Print options, if any */
+ while (length != 0) {
+ if (GET_U_1(bp) != '\0')
+ ND_PRINT(" ");
+ ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
+ if (ui == 0)
+ goto trunc;
+ bp += ui;
+ length -= ui;
+ }
+ break;
+
+ case OACK:
+ /* Print options */
+ while (length != 0) {
+ if (GET_U_1(bp) != '\0')
+ ND_PRINT(" ");
+ ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
+ if (ui == 0)
+ goto trunc;
+ bp += ui;
+ length -= ui;
+ }
break;
case ACK:
case DATA:
- TCHECK(tp->th_block);
- printf(" block %d", ntohs(tp->th_block));
+ if (length < 2)
+ goto trunc; /* no block number */
+ ND_PRINT(" block %u", GET_BE_U_2(bp));
break;
- case ERROR:
+ case TFTP_ERROR:
/* Print error code string */
- TCHECK(tp->th_code);
- printf(" %s ", tok2str(err2str, "tftp-err-#%d \"",
- ntohs(tp->th_code)));
+ if (length < 2)
+ goto trunc; /* no error code */
+ ND_PRINT(" %s", tok2str(err2str, "tftp-err-#%u \"",
+ GET_BE_U_2(bp)));
+ bp += 2;
+ length -= 2;
/* Print error message string */
- i = fn_print((const u_char *)tp->th_data, snapend);
- putchar('"');
- if (i)
+ if (length == 0)
+ goto trunc; /* no error message */
+ ND_PRINT(" \"");
+ ui = nd_printztn(ndo, bp, length, ndo->ndo_snapend);
+ ND_PRINT("\"");
+ if (ui == 0)
goto trunc;
break;
default:
/* We shouldn't get here */
- printf("(unknown #%d)", opcode);
+ ND_PRINT("(unknown #%u)", opcode);
break;
}
return;
trunc:
- fputs(tstr, stdout);
- return;
+ nd_print_trunc(ndo);
}
projects / tcpdump / blobdiff