More UNALIGNED_MEM{CPY,CMP} on IP addresses.

[tcpdump] / print-tftp.c

diff --git a/print-tftp.c b/print-tftp.c
index 17b34b57a4811c652302f84308b0e1956dc7eb00..2808bcc1fd3db640592d4946d5723e098a532fad 100644 (file)
--- a/print-tftp.c
+++ b/print-tftp.c
@@ -21,44 +21,80 @@
  * 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
-
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#include <sys/param.h>
-#include <sys/time.h>
-
-#include <netinet/in.h>
+#include <tcpdump-stdinc.h>
 
 #ifdef SEGSIZE
 #undef SEGSIZE                                 /* SINIX sucks */
 #endif
-#include <arpa/tftp.h>
 
-#include <ctype.h>
 #include <stdio.h>
 #include <string.h>
 
 #include "interface.h"
 #include "addrtoname.h"
+#include "extract.h"
+
+/*
+ * Trivial File Transfer Protocol (IEN-133)
+ */
+#define        SEGSIZE         512             /* data segment size */
+
+/*
+ * 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 */
@@ -80,7 +116,6 @@ tftp_print(register const u_char *bp, u_int length)
        register const char *cp;
        register const u_char *p;
        register int opcode, i;
-       static char tstr[] = " [|tftp]";
 
        tp = (const struct tftphdr *)bp;
 
@@ -89,7 +124,7 @@ tftp_print(register const u_char *bp, u_int length)
 
        /* Print tftp request type */
        TCHECK(tp->th_opcode);
-       opcode = ntohs(tp->th_opcode);
+       opcode = EXTRACT_16BITS(&tp->th_opcode);
        cp = tok2str(op2str, "tftp-#%d", opcode);
        printf(" %s", cp);
        /* Bail if bogus opcode */
@@ -100,18 +135,27 @@ tftp_print(register const u_char *bp, u_int length)
 
        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);
+               putchar(' ');
+               /* Print filename or first option */
+               if (opcode != OACK)
+                       putchar('"');
                i = fn_print(p, snapend);
-               putchar('"');
+               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 (i)
                        goto trunc;
                break;
@@ -119,14 +163,14 @@ tftp_print(register const u_char *bp, u_int length)
        case ACK:
        case DATA:
                TCHECK(tp->th_block);
-               printf(" block %d", ntohs(tp->th_block));
+               printf(" 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 \"",
-                                      ntohs(tp->th_code)));
+               printf(" %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('"');