X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/c2f8796261ffc7d6084dbfee2120186276bd4521..5ef0bcb5edd748de9d9af13c40da0395dfdd94e8:/print-tftp.c diff --git a/print-tftp.c b/print-tftp.c index 45ec8e95..e90fb68c 100644 --- a/print-tftp.c +++ b/print-tftp.c @@ -17,45 +17,61 @@ * 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 1.34 2003-02-19 08:01:36 guy Exp $ (LBL)"; -#endif +/* \summary: Trivial File Transfer Protocol (TFTP) printer */ #ifdef HAVE_CONFIG_H -#include "config.h" +#include #endif -#include - -#ifdef SEGSIZE -#undef SEGSIZE /* SINIX sucks */ -#endif -#include +#include "netdissect-stdinc.h" -#include #include -#include "interface.h" -#include "addrtoname.h" +#include "netdissect.h" #include "extract.h" +/* + * 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 */ + +/* + * 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 */ + + /* 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 */ @@ -71,85 +87,115 @@ static struct tok err2str[] = { * 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 = EXTRACT_16BITS(&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('"'); - - /* Print the mode and any options */ - while ((p = strchr(p, '\0')) != NULL) { - if (length <= ((unsigned)p - (unsigned)&tp->th_block)) - break; - p++; - if (*p != '\0') { - putchar(' '); - fn_print(p, snapend); - } - } - - 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", EXTRACT_16BITS(&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 \"", - EXTRACT_16BITS(&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); + nd_print_trunc(ndo); return; }