/* $NetBSD: print-ascii.c,v 1.1 1999/09/30 14:49:12 sjg Exp $ */ /*- * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Alan Barrett and Simon J. Gerraty. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* \summary: ASCII packet dump printer */ #ifdef HAVE_CONFIG_H #include #endif #include "netdissect-stdinc.h" #include #include "netdissect.h" #include "extract.h" #define ASCII_LINELENGTH 300 #define HEXDUMP_BYTES_PER_LINE 16 #define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2) #define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */ #define HEXDUMP_HEXSTUFF_PER_LINE \ (HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE) static void hex_and_ascii_print_with_offset(netdissect_options *, const char *, const u_char *, u_int, u_int); void ascii_print(netdissect_options *ndo, const u_char *cp, u_int length) { u_int caplength; u_char s; ndo->ndo_protocol = "ascii"; caplength = (ndo->ndo_snapend > cp) ? ndo->ndo_snapend - cp : 0; if (length > caplength) length = caplength; ND_PRINT("\n"); while (length > 0) { s = EXTRACT_U_1(cp); cp++; length--; if (s == '\r') { /* * Don't print CRs at the end of the line; they * don't belong at the ends of lines on UN*X, * and the standard I/O library will give us one * on Windows so we don't need to print one * ourselves. * * In the middle of a line, just print a '.'. */ if (length > 1 && EXTRACT_U_1(cp) != '\n') ND_PRINT("."); } else { if (!ND_ISGRAPH(s) && (s != '\t' && s != ' ' && s != '\n')) ND_PRINT("."); else ND_PRINT("%c", s); } } } static void hex_and_ascii_print_with_offset(netdissect_options *ndo, const char *ident, const u_char *cp, u_int length, u_int oset) { u_int caplength; u_int i; int s1, s2; int nshorts; char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp; char asciistuff[ASCII_LINELENGTH+1], *asp; caplength = (ndo->ndo_snapend > cp) ? ndo->ndo_snapend - cp : 0; if (length > caplength) length = caplength; nshorts = length / sizeof(u_short); i = 0; hsp = hexstuff; asp = asciistuff; while (--nshorts >= 0) { s1 = EXTRACT_U_1(cp); cp++; s2 = EXTRACT_U_1(cp); cp++; (void)nd_snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff), " %02x%02x", s1, s2); hsp += HEXDUMP_HEXSTUFF_PER_SHORT; *(asp++) = (ND_ISGRAPH(s1) ? s1 : '.'); *(asp++) = (ND_ISGRAPH(s2) ? s2 : '.'); i++; if (i >= HEXDUMP_SHORTS_PER_LINE) { *hsp = *asp = '\0'; ND_PRINT("%s0x%04x: %-*s %s", ident, oset, HEXDUMP_HEXSTUFF_PER_LINE, hexstuff, asciistuff); i = 0; hsp = hexstuff; asp = asciistuff; oset += HEXDUMP_BYTES_PER_LINE; } } if (length & 1) { s1 = EXTRACT_U_1(cp); cp++; (void)nd_snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff), " %02x", s1); hsp += 3; *(asp++) = (ND_ISGRAPH(s1) ? s1 : '.'); ++i; } if (i > 0) { *hsp = *asp = '\0'; ND_PRINT("%s0x%04x: %-*s %s", ident, oset, HEXDUMP_HEXSTUFF_PER_LINE, hexstuff, asciistuff); } } void hex_and_ascii_print(netdissect_options *ndo, const char *ident, const u_char *cp, u_int length) { hex_and_ascii_print_with_offset(ndo, ident, cp, length, 0); } /* * telnet_print() wants this. It is essentially default_print_unaligned() */ void hex_print_with_offset(netdissect_options *ndo, const char *ident, const u_char *cp, u_int length, u_int oset) { u_int caplength; u_int i, s; int nshorts; caplength = (ndo->ndo_snapend > cp) ? ndo->ndo_snapend - cp : 0; if (length > caplength) length = caplength; nshorts = (u_int) length / sizeof(u_short); i = 0; while (--nshorts >= 0) { if ((i++ % 8) == 0) { ND_PRINT("%s0x%04x: ", ident, oset); oset += HEXDUMP_BYTES_PER_LINE; } s = EXTRACT_U_1(cp); cp++; ND_PRINT(" %02x%02x", s, EXTRACT_U_1(cp)); cp++; } if (length & 1) { if ((i % 8) == 0) ND_PRINT("%s0x%04x: ", ident, oset); ND_PRINT(" %02x", EXTRACT_U_1(cp)); } } /* * just for completeness */ void hex_print(netdissect_options *ndo,const char *ident, const u_char *cp, u_int length) { hex_print_with_offset(ndo, ident, cp, length, 0); } #ifdef MAIN int main(int argc, char *argv[]) { hex_print("\n\t", "Hello, World!\n", 14); printf("\n"); hex_and_ascii_print("\n\t", "Hello, World!\n", 14); printf("\n"); ascii_print("Hello, World!\n", 14); printf("\n"); #define TMSG "Now is the winter of our discontent...\n" hex_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100); printf("\n"); hex_and_ascii_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100); printf("\n"); exit(0); } #endif /* MAIN */