X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/2813c22cf1ab58ee309749eae16f6211cea59952..c0af6af3011d4c55bdadf3dd76cd5fc1115c50d0:/print-ascii.c diff --git a/print-ascii.c b/print-ascii.c index 8483c47b..df3f36a1 100644 --- a/print-ascii.c +++ b/print-ascii.c @@ -36,100 +36,159 @@ * POSSIBILITY OF SUCH DAMAGE. */ +/* \summary: ASCII packet dump printer */ + #ifdef HAVE_CONFIG_H -#include "config.h" +#include #endif -#include -#ifndef lint -__RCSID("$NetBSD: print-ascii.c,v 1.1 1999/09/30 14:49:12 sjg Exp $"); -#endif +#include "netdissect-stdinc.h" #include -#include -#include -#include "interface.h" +#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_with_offset(register const u_char *cp, register u_int length, - register u_int oset) +ascii_print(netdissect_options *ndo, + const u_char *cp, u_int length) { - register u_int i; - register int s1, s2; - register int nshorts; + 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; + u_int s1, s2; + u_int nshorts; char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp; - char asciistuff[HEXDUMP_BYTES_PER_LINE+1], *asp; + 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 = *cp++; - s2 = *cp++; - (void)sprintf(hsp, " %02x%02x", s1, s2); + 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++) = (isgraph(s1) ? s1 : '.'); - *(asp++) = (isgraph(s2) ? s2 : '.'); - if (++i >= HEXDUMP_SHORTS_PER_LINE) { - *hsp = *asp = '\0'; - (void)printf("\n0x%04x\t%-*s\t%s", - oset, HEXDUMP_HEXSTUFF_PER_LINE, - hexstuff, asciistuff); - i = 0; hsp = hexstuff; asp = asciistuff; - oset += HEXDUMP_BYTES_PER_LINE; + *(asp++) = (char)(ND_ISGRAPH(s1) ? s1 : '.'); + *(asp++) = (char)(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; } + nshorts--; } if (length & 1) { - s1 = *cp++; - (void)sprintf(hsp, " %02x", s1); + s1 = EXTRACT_U_1(cp); + cp++; + (void)nd_snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff), + " %02x", s1); hsp += 3; - *(asp++) = (isgraph(s1) ? s1 : '.'); + *(asp++) = (char)(ND_ISGRAPH(s1) ? s1 : '.'); ++i; } if (i > 0) { *hsp = *asp = '\0'; - (void)printf("\n0x%04x\t%-*s\t%s", - oset, HEXDUMP_HEXSTUFF_PER_LINE, - hexstuff, asciistuff); + ND_PRINT("%s0x%04x: %-*s %s", + ident, oset, HEXDUMP_HEXSTUFF_PER_LINE, + hexstuff, asciistuff); } } void -ascii_print(register const u_char *cp, register u_int length) +hex_and_ascii_print(netdissect_options *ndo, const char *ident, + const u_char *cp, u_int length) { - ascii_print_with_offset(cp, length, 0); + 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(register const u_char *cp, register u_int length, - register u_int oset) +hex_print_with_offset(netdissect_options *ndo, + const char *ident, const u_char *cp, u_int length, + u_int oset) { - register u_int i, s; - register int nshorts; + u_int caplength; + u_int i, s; + u_int nshorts; - nshorts = (u_int) length / sizeof(u_short); + caplength = (ndo->ndo_snapend > cp) ? ndo->ndo_snapend - cp : 0; + if (length > caplength) + length = caplength; + nshorts = length / sizeof(u_short); i = 0; - while (--nshorts >= 0) { + while (nshorts != 0) { if ((i++ % 8) == 0) { - (void)printf("\n0x%04x\t", oset); + ND_PRINT("%s0x%04x: ", ident, oset); oset += HEXDUMP_BYTES_PER_LINE; } - s = *cp++; - (void)printf(" %02x%02x", s, *cp++); + s = EXTRACT_U_1(cp); + cp++; + ND_PRINT(" %02x%02x", s, EXTRACT_U_1(cp)); + cp++; + nshorts--; } if (length & 1) { if ((i % 8) == 0) - (void)printf("\n0x%04x\t", oset); - (void)printf(" %02x", *cp); + ND_PRINT("%s0x%04x: ", ident, oset); + ND_PRINT(" %02x", EXTRACT_U_1(cp)); } } @@ -137,21 +196,25 @@ hex_print_with_offset(register const u_char *cp, register u_int length, * just for completeness */ void -hex_print(register const u_char *cp, register u_int length) +hex_print(netdissect_options *ndo,const char *ident, const u_char *cp, u_int length) { - hex_print_with_offset(cp, length, 0); + hex_print_with_offset(ndo, ident, cp, length, 0); } #ifdef MAIN int main(int argc, char *argv[]) { - hex_print("Hello, World!\n", 14); + 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" - ascii_print_with_offset(TMSG, sizeof(TMSG) - 1, 0x100); + 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); }