* Format and print trivial file transfer protocol packets.
*/
-
+#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
-#ifdef SEGSIZE
-#undef SEGSIZE /* SINIX sucks */
-#endif
-#include <arpa/tftp.h>
-
-#include <stdio.h>
#include <string.h>
#include "interface.h"
-#include "addrtoname.h"
#include "extract.h"
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-tftp.c,v 1.36 2003-11-15 00:39:42 guy Exp $ (LBL)";
-#endif
+/*
+ * Trivial File Transfer Protocol (IEN-133)
+ */
+
+/*
+ * 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 */
+
+struct tftphdr {
+ unsigned short th_opcode; /* packet type */
+ union {
+ unsigned short tu_block; /* block # */
+ unsigned short tu_code; /* error code */
+ char tu_stuff[1]; /* request packet stuff */
+ } th_u;
+ char th_data[1]; /* data or error string */
+};
+
+#define th_block th_u.tu_block
+#define th_code th_u.tu_code
+#define th_stuff th_u.tu_stuff
+#define th_msg th_data
+
+/*
+ * 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 */
+
+static const char tstr[] = " [|tftp]";
+
/* 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,
+ 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 */
- printf(" %d", length);
+ ND_PRINT((ndo, " %d", length));
/* Print tftp request type */
- TCHECK(tp->th_opcode);
+ ND_TCHECK(tp->th_opcode);
opcode = EXTRACT_16BITS(&tp->th_opcode);
cp = tok2str(op2str, "tftp-#%d", opcode);
- printf(" %s", cp);
+ ND_PRINT((ndo, " %s", cp));
/* Bail if bogus opcode */
if (*cp == 't')
return;
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
+ case OACK:
p = (u_char *)tp->th_stuff;
-#else
- p = (u_char *)&tp->th_block;
-#endif
- fputs(" \"", stdout);
- i = fn_print(p, snapend);
- putchar('"');
-
- /* Print the mode and any options */
+ ND_PRINT((ndo, " "));
+ /* Print filename or first option */
+ if (opcode != OACK)
+ ND_PRINT((ndo, "\""));
+ i = fn_print(ndo, p, ndo->ndo_snapend);
+ if (opcode != OACK)
+ ND_PRINT((ndo, "\""));
+
+ /* Print the mode (RRQ and WRQ only) 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') {
- putchar(' ');
- fn_print(p, snapend);
+ ND_PRINT((ndo, " "));
+ fn_print(ndo, p, ndo->ndo_snapend);
}
}
-
+
if (i)
goto trunc;
break;
case ACK:
case DATA:
- TCHECK(tp->th_block);
- printf(" block %d", EXTRACT_16BITS(&tp->th_block));
+ ND_TCHECK(tp->th_block);
+ ND_PRINT((ndo, " block %d", EXTRACT_16BITS(&tp->th_block)));
break;
- case ERROR:
+ case TFTP_ERROR:
/* Print error code string */
- TCHECK(tp->th_code);
- printf(" %s ", tok2str(err2str, "tftp-err-#%d \"",
- EXTRACT_16BITS(&tp->th_code)));
+ ND_TCHECK(tp->th_code);
+ ND_PRINT((ndo, " %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);
- putchar('"');
+ i = fn_print(ndo, (const u_char *)tp->th_data, ndo->ndo_snapend);
+ ND_PRINT((ndo, "\""));
if (i)
goto trunc;
break;
default:
/* We shouldn't get here */
- printf("(unknown #%d)", opcode);
+ ND_PRINT((ndo, "(unknown #%d)", opcode));
break;
}
return;
trunc:
- fputs(tstr, stdout);
+ ND_PRINT((ndo, "%s", tstr));
return;
}
projects / tcpdump / blobdiff