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tcpshow.c
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tcpshow.c
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#if !defined(MAY_NOT_MODIFY)
/****==========------------------------------------------------==========****/
/* */
/* tcpshow, v1.0 */
/* */
/* Quickie to decode a "tcpdump" savefile. */
/* */
/* The application data is displayed as ASCII -- application protocols are */
/* not decoded. */
/* */
/* The data captured by "tcpdump" might be less than in the original */
/* packet. We kludge a solution to this with setjmp()/longjmp(). */
/* */
/* Although written to read tcpdump savefiles, with tcpdump itself as a */
/* front-end, it'll decode any hex dump that adheres to the format */
/* expected. Some programs which capture network data offer an option to */
/* save the trace to a file in hex format -- this can often be massaged */
/* easily with Perl/awk/sh scripts to turn it into the format expected. */
/* As a special case, "tcpdump -s 1500 -lenx | tcpshow -cooked" works */
/* rather well, and "tcpdump -s 1500 -lenx | tcpshow -cooked -data" is nice */
/* for watching the data traffic in real time. */
/* */
/* ------------------------------------------------------------------------ */
/* */
/* Copyright (c) 1996 I.T. NetworX Ltd. All rights reserved. */
/* */
/* This source code is owned and copyrighted by I.T. NetworX Ltd. This */
/* file and all files derived from it, directly or indirectly (such files */
/* collectively and separately being referred to henceforth as "this file") */
/* may be used, modified and redistributed subject to the following five */
/* Conditions. */
/* */
/* Condition 1 of 5: */
/* That all text (code/comments, etc.) in this file surrounded by the macro */
/* block "#if !defined(MAY_NOT_MODIFY) ... #endif", including the macro */
/* statements themselves, may not be modified in any way, or deleted. In */
/* particular, this comment block and the printf() statements identifying */
/* I.T. NetworX as being the copyright owner, in the function usage(), may */
/* not be modified or deleted. The single, only, exception to this is that */
/* the non-inclusion of C comments by a C compiler/linker, in the object */
/* and executable images it produces, is permitted. */
/* */
/* Condition 2 of 5: */
/* That no financial gain be made from using this file, redistributing this */
/* file or modifying this file. */
/* */
/* Condition 3 of 5: */
/* That no conditions other than these five Conditions be applied to the */
/* use, modification or redistribution of this file. */
/* */
/* Condition 4 of 5: */
/* That I.T. NetworX, its employees, agents and everybody else in the world */
/* dead, living and yet to be born, are hereby free from liability of all */
/* and every kind arising from the use of this file by anybody for any */
/* purpose. This file comes "as is" and all warranties, express or */
/* implied, are disclaimed. As the manual page for chat(1) says, "if it */
/* breaks, then you get to keep both pieces". */
/* */
/* Condition 5 of 5: */
/* That I.T. NetworX reserves the right to alter these Conditions at any */
/* time without giving prior notice, such alterations to apply only to the */
/* version current at the time of issue of the alterations and all later */
/* versions, and such alterations to apply only to versions produced */
/* exclusively by I.T. NetworX or its agents. */
/* */
/* Addendum to Copyright: */
/* I'm not a legal eagle and I worded the above notice off the top of my */
/* head, so it may be full of holes, but the spirit of my intentions are */
/* clear from reading it. Please respect these intentions. */
/* */
/* Me too: */
/* If anybody makes significant improvements to this file, such as adding */
/* decode support for DNS traffic, I would appreciate it if they send me a */
/* copy of their work ([email protected]). Thanks. */
/* */
/* ------------------------------------------------------------------------ */
/* */
/* File layout is as follows: */
/* system includes */
/* local includes */
/* #define macros */
/* typedefs */
/* declarations of extern variables */
/* declarations of extern functions */
/* declarations of global variables */
/* declarations of global functions */
/* declarations of static variables */
/* declarations of static functions */
/* definitions of functions */
/* (all functions and variables are declared/defined in alphabetical order) */
/* */
/* ------------------------------------------------------------------------ */
/* */
/* Compiles as follows: */
/* cc -s -O -o tcpshow tcpshow.c */
/* */
/* ------------------------------------------------------------------------ */
/* */
/* Who and when: */
/* MikeRyan, 11apr96. */
/* */
/* I.T. NetworX, */
/* 67 Merrion Square, */
/* Dublin 2, */
/* Ireland. */
/* Phone: +353-1-676-8866 */
/* Fax: +353-1-676-8868 */
/* Email: [email protected] */
/* */
/* ------------------------------------------------------------------------ */
/* */
/* Modification History */
/* MikeRyan, 14may96: Allow "tcpdump" expressions to be passed in. */
/* MikeRyan, 15may96: Added UDP decode logic. */
/* MikeRyan, 16may96: Added ICMP decode logic. */
/* MikeRyan, 16may96: Added -b switch to break long lines */
/* -w option to specify the width of the page */
/* -h flag to give help on usage. */
/* MikeRyan, 28may96: Added -nolink */
/* -nodata */
/* -noip */
/* -track */
/* -terse */
/* -sb */
/* -s */
/* MikeRyan, 25jun96: Incorporated my "general.h" typedef's, so that the */
/* present source file doesn't depend on any non-standard header files. */
/* This allows it to be distributed as a single file. Also included the */
/* copyright notice, as I'm making the program freely available. */
/* */
/* MikeRyan, 26jun96: Added -cooked */
/* -pp */
/* */
/****==========------------------------------------------------==========****/
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <netdb.h>
#include <setjmp.h>
/* Some general defines. */
#if defined(FALSE)
#undef FALSE
#endif
#if defined(TRUE)
#undef TRUE
#endif
#define FALSE (boolean)0
#define TRUE (boolean)1
#define elif else if
#if !defined(reg)
#define reg register /* For debugging purposes */
#endif
#define VERSION 1.0 /* Please change when appropriate */
#define COOKER "tcpdump"
#define MAXCOOKARGS 100 /* Max tcpdump expression words */
#define MAXPKT 10240 /* Should be 1518 for Ethernet */
#define NCOLS 60
/* IP header elements. */
#define IPHDRLEN 20
#define FRAGOFF 0x1FFF
#define MF 0x2000
#define DF 0x4000
/* TCP header elements. */
#define TCPHDRLEN 20
#define URG 0x0020
#define ACK 0x0010
#define PSH 0x0008
#define RST 0x0004
#define SYN 0x0002
#define FIN 0x0001
/* UDP header elements. */
#define UDPHDRLEN 8
/* ICMP header elements. */
#define ICMPHDRLEN 4
/* IP protocol types. */
#define IP 0
#define ICMP 1
#define IGMP 2
#define GGP 3
#define IPENCAP 4
#define ST 5
#define TCP 6
#define EGP 8
#define PUP 12
#define UDP 17
#define HMP 20
#define XNSIDP 22
#define RDP 27
#define ISOTP4 29
#define XTP 36
#define IDPRCMTP 39
#define RSVP 46
#define VMTP 81
#define OSPF 89
#define IPIP 94
#define ENCAP 98
/* ICMP types. */
#define ECHO_REPLY 0
#define DST_UNREACH 3
#define SRC_QUENCH 4
#define REDIRECT 5
#define ECHO_REQ 8
#define ROUTER_AD 9
#define ROUTER_SOL 10
#define TIME_EXCEED 11
#define PARAM_PROB 12
#define TIME_REQ 13
#define TIME_REPLY 14
#define INFO_REQ 15
#define INFO_REPLY 16
#define MASK_REQ 17
#define MASK_REPLY 18
/* ICMP codes for type == Destination Unreachable. */
#define NET_UNREACH 0
#define HOST_UNREACH 1
#define PROTO_UNREACH 2
#define PORT_UNREACH 3
#define DF_SET 4
#define SRCROUTE_FAILED 5
#define DSTNET_UNKNOWN 6
#define DSTHOST_UNKNOWN 7
#define SRCHOST_ISOLATED 8
#define DSTNET_PROHIB 9
#define DSTHOST_PROHIB 10
#define NET_UNREACH_TOS 11
#define HOST_UNREACH_TOS 12
#define COMM_PROHIB 13
#define HOST_PREC_VIOL 14
#define PREC_CUTOFF 15
/* ICMP codes for type == Redirect. */
#define REDIR_FOR_NET 0
#define REDIR_FOR_HOST 1
#define REDIR_FOR_TOSNET 2
#define REDIR_FOR_TOSHOST 3
/* ICMP codes for type == Time Exceeded. */
#define TTL_ZERO 0
#define REASS_TIMEOUT 1
/* ICMP codes for type == Parameter Problem. */
#define IP_HDR_BAD 0
#define MISSING_OPT 1
/* Skip remaining lines of current packet. Note that this causes a */
/* longjmp(), so a succeeding "return" from a function isn't needed. */
#define nextpkt() for ( ; ; ) (void)getpkt()
/* Display a separator line between packet decodes. */
#define prsep() \
printf( \
"-----------------------------------------------------------------\n" \
)
/* My own preferred basic data types -- amend per target machine. */
typedef char boolean;
typedef float float4;
typedef double float8;
typedef char int1;
typedef short int2;
typedef int int4;
typedef unsigned char uint1;
typedef unsigned short uint2;
typedef unsigned int uint4;
typedef unsigned char uchar;
void main(int, char **);
static boolean bflag = FALSE;
static char *cookargs[MAXCOOKARGS+1];
static boolean cookedflag = FALSE;
static boolean dataflag = FALSE;
static uint2 datalen = 0;
static char *dflt_cookargs[] = {
COOKER, "-enx", "-s10240", "-r-", (char *)NULL
};
static char dip[16];
static boolean isip;
static jmp_buf jmpbuf;
static boolean nodataflag = FALSE;
static boolean noipflag = FALSE;
static boolean nolinkflag = FALSE;
static int npkts_shown = 0;
static char *off = "off,"; /* "off" in middle of list */
static char *off_e = "off"; /* "off" at end of list */
static char *on = "on, "; /* "on" in middle of list */
static char *on_e = "on"; /* "on" at end of list */
static int pagewidth = NCOLS;
static char *pkt;
static boolean ppflag = FALSE;
static uint1 proto;
static boolean sflag = FALSE;
static boolean sbflag = FALSE;
static char sip[16];
static boolean terseflag = FALSE;
static boolean trackflag = FALSE;
static char *unknown = "<unknown>";
static void error(char *);
static char *etheraddr(char *);
static char *ether_proto(char *);
static void fork_tcpdump(int, char **);
static uint1 getbyte(char **);
static uint4 getlongword(char **);
static char *getpkt(void);
static uint2 getword(char **);
static char *icmpcode(uint1, uint1);
static char *icmptype(uint1);
static char *ipaddr(char **);
static char *ip_proto(uint1);
static char nextchar(char **);
static char *rmwspace(char *);
static char *showdata(char *);
static char *showhdr(char *);
static char *showicmp(char *);
static char *showip(char *);
static void showpkt(char *);
static char *showtcp(char *);
static char *showudp(char *);
static char *skip(char *, uint2);
static char *svcname(uint2, char *, boolean);
static void usage(void);
/****==========------------------------------------------------==========****/
/* */
/* Print an error message and exit. */
/* */
/****==========------------------------------------------------==========****/
static void error (
char *msg
) {
fprintf(stderr, "***Error: %s\n", msg);
exit(1);
}
/****==========------------------------------------------------==========****/
/* */
/* Print a formatted Ethernet address. */
/* */
/****==========------------------------------------------------==========****/
static char *etheraddr (
char *eaddr
) {
static char formatted[18];
int i;
int j;
for (i = j = 0; i < 6; i++)
if (eaddr[1] == ':') {
formatted[j++] = '0';
formatted[j++] = toupper(eaddr[0]);
formatted[j++] = ':';
eaddr += 2;
}
else {
formatted[j++] = toupper(eaddr[0]);
formatted[j++] = toupper(eaddr[1]);
formatted[j++] = ':';
eaddr += 3;
}
formatted[j-1] = '\0';
return formatted;
}
/****==========------------------------------------------------==========****/
/* */
/* Print the type of protocol encapsulated in the Ethernet frame. */
/* */
/****==========------------------------------------------------==========****/
static char *ether_proto (
char *type
) {
if (strcmp(type, "0800") == 0)
return "IP";
elif (strcmp(type, "0806") == 0)
return "ARP";
elif (strcmp(type, "8035") == 0)
return "RARP";
else
return type;
}
/****==========------------------------------------------------==========****/
/* */
/* Run tcpdump to pre-process the trace file. */
/* */
/****==========------------------------------------------------==========****/
static void fork_tcpdump (
int argc,
char **argv
) {
int fd[2];
int i;
pid_t pid;
/* Required "tcpdump" flags. */
i = 0;
while (dflt_cookargs[i]) {
cookargs[i] = dflt_cookargs[i];
i++;
}
while (argc-- > 0) {
if (i >= MAXCOOKARGS) error("Too many expressions");
cookargs[i++] = *argv++;
}
cookargs[i] = (char *)NULL;
/* Fork tcpdump to cook our input. */
if (pipe(fd)) error("pipe() failed");
if ((pid=fork()) < 0) error("fork() failed");
if (pid == 0) {
(void)close(1);
if (dup(fd[1]) != 1) error("dup() failed");
(void)close(fd[0]);
(void)close(fd[1]);
execvp(COOKER, cookargs);
error("execvp() failed");
}
(void)close(0);
if (dup(fd[0]) != 0) error("dup() failed");
(void)close(fd[0]);
(void)close(fd[1]);
}
/****==========------------------------------------------------==========****/
/* */
/* Return the byte value and increment the pointer by sizeof(byte). */
/* */
/****==========------------------------------------------------==========****/
static uint1 getbyte (
char **pkt
) {
char byte[1*2+1]; /* ASCII representation of a byte */
unsigned int val;
byte[0] = nextchar(pkt);
byte[1] = nextchar(pkt);
byte[2] = '\0';
(void)sscanf(byte, "%x", &val);
return (uint1)val;
}
/****==========------------------------------------------------==========****/
/* */
/* Return the longword value and increment the pointer by sizeof(longword). */
/* */
/****==========------------------------------------------------==========****/
static uint4 getlongword (
char **pkt
) {
char longword[4*2+1]; /* ASCII representation of a longword */
unsigned long val;
longword[0] = nextchar(pkt);
longword[1] = nextchar(pkt);
longword[2] = nextchar(pkt);
longword[3] = nextchar(pkt);
longword[4] = nextchar(pkt);
longword[5] = nextchar(pkt);
longword[6] = nextchar(pkt);
longword[7] = nextchar(pkt);
longword[8] = '\0';
(void)sscanf(longword, "%lx", &val);
return (uint4)val;
}
/****==========------------------------------------------------==========****/
/* */
/* Read in the next line of packet data. */
/* */
/****==========------------------------------------------------==========****/
static char *getpkt (
) {
static boolean been_here_already = FALSE;
static char pktbuf[MAXPKT+1];
if (fgets(pktbuf, MAXPKT+1, stdin) == (char *)NULL) exit(0);
/* Line without leading <tab> means start of new packet. */
if (*pktbuf == '\t')
return rmwspace(pktbuf);
elif (! been_here_already) { /* setjmp() won't have been called */
been_here_already = TRUE; /* before reading 1st packet */
return pkt = pktbuf;
}
else {
if (datalen > 0)
printf("\n\t<*** Rest of data missing from packet dump ***>\n");
pkt = pktbuf;
longjmp(jmpbuf, 1);
}
}
/****==========------------------------------------------------==========****/
/* */
/* Return the word value and increment the pointer by sizeof(word). */
/* */
/****==========------------------------------------------------==========****/
static uint2 getword (
char **pkt
) {
char word[2*2+1]; /* ASCII representation of a word */
unsigned int val;
word[0] = nextchar(pkt);
word[1] = nextchar(pkt);
word[2] = nextchar(pkt);
word[3] = nextchar(pkt);
word[4] = '\0';
(void)sscanf(word, "%x", &val);
return (uint2)val;
}
/****==========------------------------------------------------==========****/
/* */
/* Print the code relating to the ICMP type. */
/* */
/****==========------------------------------------------------==========****/
static char *icmpcode (
uint1 type,
uint1 code
) {
char *bad;
char *descr;
bad = "<*** CORRUPT ***>";
descr = (char *)NULL;
switch (type) {
case ECHO_REPLY:
switch (code) {
case 0: break;
default: descr = bad; break;
}
break;
case DST_UNREACH:
switch (code) {
case NET_UNREACH: descr = "network-unreachable"; break;
case HOST_UNREACH: descr = "host-unreachable"; break;
case PROTO_UNREACH: descr = "protocol-unreachable"; break;
case PORT_UNREACH: descr = "port-unreachable"; break;
case DF_SET: descr = "frag-needed-but-DF-set"; break;
case SRCROUTE_FAILED: descr = "source-route-failed"; break;
case DSTNET_UNKNOWN: descr = "destination-network-unknown"; break;
case DSTHOST_UNKNOWN: descr = "destination-host-unknown"; break;
case SRCHOST_ISOLATED: descr = "source-host-isolated"; break;
case DSTNET_PROHIB: descr = "dest-net-admin-prohibited"; break;
case DSTHOST_PROHIB: descr = "dest-host-admin-prohibited"; break;
case NET_UNREACH_TOS: descr = "network-unreachable-for-TOS"; break;
case HOST_UNREACH_TOS: descr = "host-unreachable-for-TOS"; break;
case COMM_PROHIB: descr = "trafffic-prohibited-by-filter"; break;
case HOST_PREC_VIOL: descr = "host-precedence-violation"; break;
case PREC_CUTOFF: descr = "precedence-cutoff-in-effect"; break;
default: descr = bad; break;
}
break;
case SRC_QUENCH:
switch (code) {
case 0: break;
default: descr = bad; break;
}
break;
case REDIRECT:
switch (code) {
case REDIR_FOR_NET: descr = "route-wrong-for-network"; break;
case REDIR_FOR_HOST: descr = "route-wrong-for-host"; break;
case REDIR_FOR_TOSNET: descr = "route-wrong-for-TOS-and-net"; break;
case REDIR_FOR_TOSHOST: descr = "route-wrong-for-TOS-and-host"; break;
default: descr = bad; break;
}
break;
case ECHO_REQ:
switch (code) {
case 0: break;
default: descr = bad; break;
}
break;
case ROUTER_AD:
switch (code) {
case 0: break;
default: descr = bad; break;
}
break;
case ROUTER_SOL:
switch (code) {
case 0: break;
default: descr = bad; break;
}
break;
case TIME_EXCEED:
switch (code) {
case TTL_ZERO: descr = "TTL-reached-zero"; break;
case REASS_TIMEOUT: descr = "reassembly-timer-expired"; break;
default: descr = bad; break;
}
break;
case PARAM_PROB:
switch (code) {
case IP_HDR_BAD: descr = "IP-header-bad"; break;
case MISSING_OPT: descr = "required-option-is-missing"; break;
default: descr = bad; break;
}
break;
case TIME_REQ:
switch (code) {
case 0: break;
default: descr = bad; break;
}
break;
case TIME_REPLY:
switch (code) {
case 0: break;
default: descr = bad; break;
}
break;
case INFO_REQ:
switch (code) {
case 0: break;
default: descr = bad; break;
}
break;
case INFO_REPLY:
switch (code) {
case 0: break;
default: descr = bad; break;
}
break;
case MASK_REQ:
switch (code) {
case 0: break;
default: descr = bad; break;
}
break;
case MASK_REPLY:
switch (code) {
case 0: break;
default: descr = bad; break;
}
break;
default:
break;
}
return descr;
}
/****==========------------------------------------------------==========****/
/* */
/* Print the type of ICMP packet. */
/* */
/****==========------------------------------------------------==========****/
static char *icmptype (
uint1 type
) {
char *descr;
switch (type) {
case ECHO_REPLY: descr = "echo-reply"; break;
case DST_UNREACH: descr = "destination-unreachable"; break;
case SRC_QUENCH: descr = "source-quench"; break;
case REDIRECT: descr = "redirect"; break;
case ECHO_REQ: descr = "echo-request"; break;
case ROUTER_AD: descr = "router-advertisement"; break;
case ROUTER_SOL: descr = "router-solicitation"; break;
case TIME_EXCEED: descr = "time-exceeded"; break;
case PARAM_PROB: descr = "parameter-problem"; break;
case TIME_REQ: descr = "timestamp-request"; break;
case TIME_REPLY: descr = "timestamp-reply"; break;
case INFO_REQ: descr = "information-request"; break;
case INFO_REPLY: descr = "information-reply"; break;
case MASK_REQ: descr = "address-mask-request"; break;
case MASK_REPLY: descr = "address-mask-reply"; break;
default: descr = unknown; break;
}
return descr;
}
/****==========------------------------------------------------==========****/
/* */
/* Print the IP address in dotted-quad. */
/* */
/****==========------------------------------------------------==========****/
static char *ipaddr (
char **pkt
) {
static char addr[16];
uint2 byte1;
uint2 byte2;
uint2 byte3;
uint2 byte4;
/* We don't use inet_ntoa() because it wants a socket structure. */
byte1 = (uint2)getbyte(pkt);
byte2 = (uint2)getbyte(pkt);
byte3 = (uint2)getbyte(pkt);
byte4 = (uint2)getbyte(pkt);
(void)sprintf(addr, "%d.%d.%d.%d", byte1, byte2, byte3, byte4);
return addr;
}
/****==========------------------------------------------------==========****/
/* */
/* Print the type of protocol encapsulated in the IP datagram. */
/* */
/****==========------------------------------------------------==========****/
static char *ip_proto (
uint1 code
) {
char *name;
/* A simple table won't do, as the codes aren't contiguous. */
switch (code) {
case IP:
name = "IP"; break;
case ICMP:
name = "ICMP"; break;
case IGMP:
name = "IGMP"; break;
case GGP:
name = "GGP"; break;
case IPENCAP:
name = "IPENCAP"; break;
case ST:
name = "ST"; break;
case TCP:
name = "TCP"; break;
case EGP:
name = "EGP"; break;
case PUP:
name = "PUP"; break;
case UDP:
name = "UDP"; break;
case HMP:
name = "HMP"; break;
case XNSIDP:
name = "XNSIDP"; break;
case RDP:
name = "RDP"; break;
case ISOTP4:
name = "ISOTP4"; break;
case XTP:
name = "XTP"; break;
case IDPRCMTP:
name = "IDPRCMTP"; break;
case RSVP:
name = "RSVP"; break;
case VMTP:
name = "VMTP"; break;
case OSPF:
name = "OSPF"; break;
case IPIP:
name = "IPIP"; break;
case ENCAP:
name = "ENCAP"; break;
default:
name = unknown; break;
}
return name;
}
/****==========------------------------------------------------==========****/
/* */
/* Decode a "tcpdump" savefile. */
/* */
/****==========------------------------------------------------==========****/
void main (
int argc,
char **argv
) {
/* Command line options. */
while (--argc > 0 && **++argv == '-')
if (strcmp(*argv, "-data") == 0)
dataflag = nolinkflag = noipflag = TRUE;
elif (strcmp(*argv, "-s") == 0) sflag = TRUE;
elif (strcmp(*argv, "-b") == 0) bflag = TRUE;
elif (strcmp(*argv, "-sb") == 0) sbflag = TRUE;
elif (strcmp(*argv, "-terse") == 0) terseflag = TRUE;
elif (strcmp(*argv, "-track") == 0) trackflag = TRUE;
elif (strcmp(*argv, "-nodata") == 0) nodataflag = TRUE;
elif (strcmp(*argv, "-nolink") == 0) nolinkflag = TRUE;
elif (strcmp(*argv, "-noip") == 0) noipflag = TRUE;
elif (strcmp(*argv, "-cooked") == 0) cookedflag = TRUE;
elif (strcmp(*argv, "-pp") == 0) ppflag = TRUE;
elif (strcmp(*argv, "-h") == 0) usage();
elif (strcmp(*argv, "-w") == 0) {
if (--argc <= 0) error("-w needs a numeric argument");
if ((pagewidth=atoi(*++argv)) < 1) error("-w value too small");
}
else error("Unknown command line flag");
if (! cookedflag)
fork_tcpdump(argc, argv);
elif (argc != 0)
fprintf(stderr, "input is cooked -- ignoring tcpdump expressions\n");
pkt = getpkt();
for ( ; ; ) if (! setjmp(jmpbuf)) showpkt(pkt);
exit(0);
}
/****==========------------------------------------------------==========****/
/* */
/* Return the next character in the packet buffer. */
/* */
/****==========------------------------------------------------==========****/
static char nextchar (
char **pkt
) {
if (! **pkt) *pkt = getpkt();
return *(*pkt)++;
}
/****==========------------------------------------------------==========****/
/* */
/* Remove whitespace from the buffer. */
/* */
/****==========------------------------------------------------==========****/
static char *rmwspace (
reg char *pktbuf
) {
static char cleanpkt[MAXPKT+1];
reg char *pkt;
pkt = cleanpkt;
while (*pktbuf) {
if (! isspace(*pktbuf)) *pkt++ = *pktbuf;
pktbuf++;
}
*pkt = '\0';
return cleanpkt;
}
/****==========------------------------------------------------==========****/
/* */
/* Decode the TCP/UDP data. */
/* */
/****==========------------------------------------------------==========****/
static char *showdata (
char *pkt
) {
uint1 byte;
int col;
char *descr;
if (dataflag)
putchar('\t');
elif (terseflag)
printf("DATA:\t");
else {
switch (proto) {
case TCP: descr = "TCP"; break;
case UDP: descr = "UDP"; break;
case ICMP: descr = "ICMP"; break;
default: descr = unknown; break;
}
printf("%s Data\n\t", descr);
}
if (nodataflag) {
uint2 ndatabytes = datalen;
datalen = 0;
printf("%d bytes\n", ndatabytes);
return skip(pkt, ndatabytes);
}
if (datalen == 0) {
printf("<No data>\n");
return pkt;
}
switch (bflag) {
case TRUE:
for (col = 1; datalen > 0; datalen--, col++) {
byte = getbyte(&pkt);
if (byte == '\n') {
putchar('\n');
byte = '\t';
col = 0;
}
elif (col > pagewidth) {
printf("%s\n\t", sbflag? "<break>": "");
col = 1;
}
if (byte != '\t' && byte != '\n' && !isprint(byte)) byte = '.';
putchar(byte);
}
break;
case FALSE:
for ( ; datalen > 0; datalen--) {
byte = getbyte(&pkt);
if (byte == '\n') {