* 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.
*/
+/* \summary: Trivial File Transfer Protocol (TFTP) printer */
+
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <tcpdump-stdinc.h>
-
-#ifdef SEGSIZE
-#undef SEGSIZE /* SINIX sucks */
-#endif
+#include <netdissect-stdinc.h>
-#include <stdio.h>
#include <string.h>
-#include "interface.h"
-#include "addrtoname.h"
+#include "netdissect.h"
#include "extract.h"
/*
* Trivial File Transfer Protocol (IEN-133)
*/
-#define SEGSIZE 512 /* data segment size */
/*
* Packet types.
#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.
*/
* 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;
-
- tp = (const struct tftphdr *)bp;
+ register int opcode;
+ u_int ui;
/* Print length */
- printf(" %d", length);
+ ND_PRINT((ndo, " %d", length));
/* Print tftp request type */
- TCHECK(tp->th_opcode);
- opcode = EXTRACT_16BITS(&tp->th_opcode);
+ if (length < 2)
+ goto trunc;
+ ND_TCHECK_2(bp);
+ opcode = EXTRACT_BE_U_2(bp);
cp = tok2str(op2str, "tftp-#%d", opcode);
- printf(" %s", cp);
+ ND_PRINT((ndo, " %s", cp));
/* Bail if bogus opcode */
if (*cp == 't')
return;
+ bp += 2;
+ length -= 2;
switch (opcode) {
case RRQ:
case WRQ:
- case OACK:
- p = (u_char *)tp->th_stuff;
- putchar(' ');
- /* Print filename or first option */
- if (opcode != OACK)
- putchar('"');
- i = fn_print(p, snapend);
- if (opcode != OACK)
- putchar('"');
-
- /* 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);
- }
+ if (length == 0)
+ goto trunc;
+ ND_PRINT((ndo, " "));
+ /* Print filename */
+ ND_PRINT((ndo, "\""));
+ ui = fn_printztn(ndo, bp, length, ndo->ndo_snapend);
+ ND_PRINT((ndo, "\""));
+ 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((ndo, " "));
+ ui = fn_printztn(ndo, bp, length, ndo->ndo_snapend);
+ if (ui == 0)
+ goto trunc;
+ bp += ui;
+ length -= ui;
+
+ /* Print options, if any */
+ while (length != 0) {
+ ND_TCHECK(*bp);
+ if (*bp != '\0')
+ ND_PRINT((ndo, " "));
+ ui = fn_printztn(ndo, bp, length, ndo->ndo_snapend);
+ if (ui == 0)
+ goto trunc;
+ bp += ui;
+ length -= ui;
}
+ break;
- if (i)
- goto trunc;
+ case OACK:
+ /* Print options */
+ while (length != 0) {
+ ND_TCHECK(*bp);
+ if (*bp != '\0')
+ ND_PRINT((ndo, " "));
+ ui = fn_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", EXTRACT_16BITS(&tp->th_block));
+ if (length < 2)
+ goto trunc; /* no block number */
+ ND_TCHECK_2(bp);
+ ND_PRINT((ndo, " block %d", EXTRACT_BE_U_2(bp)));
break;
case TFTP_ERROR:
/* Print error code string */
- TCHECK(tp->th_code);
- printf(" %s \"", tok2str(err2str, "tftp-err-#%d \"",
- EXTRACT_16BITS(&tp->th_code)));
+ if (length < 2)
+ goto trunc; /* no error code */
+ ND_TCHECK_2(bp);
+ ND_PRINT((ndo, " %s", tok2str(err2str, "tftp-err-#%d \"",
+ EXTRACT_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((ndo, " \""));
+ ui = fn_printztn(ndo, bp, length, ndo->ndo_snapend);
+ ND_PRINT((ndo, "\""));
+ if (ui == 0)
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