nexmon – Rev 1
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/*
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* txtproto_print() derived from original code by Hannes Gredler
* (hannes@juniper.net):
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code
* distributions retain the above copyright notice and this paragraph
* in its entirety, and (2) distributions including binary code include
* the above copyright notice and this paragraph in its entirety in
* the documentation or other materials provided with the distribution.
* 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.
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <sys/stat.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "interface.h"
/*
* Print out a null-terminated filename (or other ascii string).
* If ep is NULL, assume no truncation check is needed.
* Return true if truncated.
*/
int
fn_print(netdissect_options *ndo,
register const u_char *s, register const u_char *ep)
{
register int ret;
register u_char c;
ret = 1; /* assume truncated */
while (ep == NULL || s < ep) {
c = *s++;
if (c == '\0') {
ret = 0;
break;
}
if (!ND_ISASCII(c)) {
c = ND_TOASCII(c);
ND_PRINT((ndo, "M-"));
}
if (!ND_ISPRINT(c)) {
c ^= 0x40; /* DEL to ?, others to alpha */
ND_PRINT((ndo, "^"));
}
ND_PRINT((ndo, "%c", c));
}
return(ret);
}
/*
* Print out a counted filename (or other ascii string).
* If ep is NULL, assume no truncation check is needed.
* Return true if truncated.
*/
int
fn_printn(netdissect_options *ndo,
register const u_char *s, register u_int n, register const u_char *ep)
{
register u_char c;
while (n > 0 && (ep == NULL || s < ep)) {
n--;
c = *s++;
if (!ND_ISASCII(c)) {
c = ND_TOASCII(c);
ND_PRINT((ndo, "M-"));
}
if (!ND_ISPRINT(c)) {
c ^= 0x40; /* DEL to ?, others to alpha */
ND_PRINT((ndo, "^"));
}
ND_PRINT((ndo, "%c", c));
}
return (n == 0) ? 0 : 1;
}
/*
* Print out a null-padded filename (or other ascii string).
* If ep is NULL, assume no truncation check is needed.
* Return true if truncated.
*/
int
fn_printzp(netdissect_options *ndo,
register const u_char *s, register u_int n,
register const u_char *ep)
{
register int ret;
register u_char c;
ret = 1; /* assume truncated */
while (n > 0 && (ep == NULL || s < ep)) {
n--;
c = *s++;
if (c == '\0') {
ret = 0;
break;
}
if (!ND_ISASCII(c)) {
c = ND_TOASCII(c);
ND_PRINT((ndo, "M-"));
}
if (!ND_ISPRINT(c)) {
c ^= 0x40; /* DEL to ?, others to alpha */
ND_PRINT((ndo, "^"));
}
ND_PRINT((ndo, "%c", c));
}
return (n == 0) ? 0 : ret;
}
/*
* Format the timestamp
*/
static char *
ts_format(netdissect_options *ndo
#ifndef HAVE_PCAP_SET_TSTAMP_PRECISION
_U_
#endif
, int sec, int usec)
{
static char buf[sizeof("00:00:00.000000000")];
const char *format;
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
switch (ndo->ndo_tstamp_precision) {
case PCAP_TSTAMP_PRECISION_MICRO:
format = "%02d:%02d:%02d.%06u";
break;
case PCAP_TSTAMP_PRECISION_NANO:
format = "%02d:%02d:%02d.%09u";
break;
default:
format = "%02d:%02d:%02d.{unknown precision}";
break;
}
#else
format = "%02d:%02d:%02d.%06u";
#endif
snprintf(buf, sizeof(buf), format,
sec / 3600, (sec % 3600) / 60, sec % 60, usec);
return buf;
}
/*
* Print the timestamp
*/
void
ts_print(netdissect_options *ndo,
register const struct timeval *tvp)
{
register int s;
struct tm *tm;
time_t Time;
static unsigned b_sec;
static unsigned b_usec;
int d_usec;
int d_sec;
switch (ndo->ndo_tflag) {
case 0: /* Default */
s = (tvp->tv_sec + thiszone) % 86400;
ND_PRINT((ndo, "%s ", ts_format(ndo, s, tvp->tv_usec)));
break;
case 1: /* No time stamp */
break;
case 2: /* Unix timeval style */
ND_PRINT((ndo, "%u.%06u ",
(unsigned)tvp->tv_sec,
(unsigned)tvp->tv_usec));
break;
case 3: /* Microseconds since previous packet */
case 5: /* Microseconds since first packet */
if (b_sec == 0) {
/* init timestamp for first packet */
b_usec = tvp->tv_usec;
b_sec = tvp->tv_sec;
}
d_usec = tvp->tv_usec - b_usec;
d_sec = tvp->tv_sec - b_sec;
while (d_usec < 0) {
d_usec += 1000000;
d_sec--;
}
ND_PRINT((ndo, "%s ", ts_format(ndo, d_sec, d_usec)));
if (ndo->ndo_tflag == 3) { /* set timestamp for last packet */
b_sec = tvp->tv_sec;
b_usec = tvp->tv_usec;
}
break;
case 4: /* Default + Date*/
s = (tvp->tv_sec + thiszone) % 86400;
Time = (tvp->tv_sec + thiszone) - s;
tm = gmtime (&Time);
if (!tm)
ND_PRINT((ndo, "Date fail "));
else
ND_PRINT((ndo, "%04d-%02d-%02d %s ",
tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
ts_format(ndo, s, tvp->tv_usec)));
break;
}
}
/*
* Print a relative number of seconds (e.g. hold time, prune timer)
* in the form 5m1s. This does no truncation, so 32230861 seconds
* is represented as 1y1w1d1h1m1s.
*/
void
relts_print(netdissect_options *ndo,
int secs)
{
static const char *lengths[] = {"y", "w", "d", "h", "m", "s"};
static const int seconds[] = {31536000, 604800, 86400, 3600, 60, 1};
const char **l = lengths;
const int *s = seconds;
if (secs == 0) {
ND_PRINT((ndo, "0s"));
return;
}
if (secs < 0) {
ND_PRINT((ndo, "-"));
secs = -secs;
}
while (secs > 0) {
if (secs >= *s) {
ND_PRINT((ndo, "%d%s", secs / *s, *l));
secs -= (secs / *s) * *s;
}
s++;
l++;
}
}
/*
* this is a generic routine for printing unknown data;
* we pass on the linefeed plus indentation string to
* get a proper output - returns 0 on error
*/
int
print_unknown_data(netdissect_options *ndo, const u_char *cp,const char *ident,int len)
{
if (len < 0) {
ND_PRINT((ndo,"%sDissector error: print_unknown_data called with negative length",
ident));
return(0);
}
if (ndo->ndo_snapend - cp < len)
len = ndo->ndo_snapend - cp;
if (len < 0) {
ND_PRINT((ndo,"%sDissector error: print_unknown_data called with pointer past end of packet",
ident));
return(0);
}
hex_print(ndo, ident,cp,len);
return(1); /* everything is ok */
}
/*
* Convert a token value to a string; use "fmt" if not found.
*/
const char *
tok2strbuf(register const struct tok *lp, register const char *fmt,
register u_int v, char *buf, size_t bufsize)
{
if (lp != NULL) {
while (lp->s != NULL) {
if (lp->v == v)
return (lp->s);
++lp;
}
}
if (fmt == NULL)
fmt = "#%d";
(void)snprintf(buf, bufsize, fmt, v);
return (const char *)buf;
}
/*
* Convert a token value to a string; use "fmt" if not found.
*/
const char *
tok2str(register const struct tok *lp, register const char *fmt,
register u_int v)
{
static char buf[4][128];
static int idx = 0;
char *ret;
ret = buf[idx];
idx = (idx+1) & 3;
return tok2strbuf(lp, fmt, v, ret, sizeof(buf[0]));
}
/*
* Convert a bit token value to a string; use "fmt" if not found.
* this is useful for parsing bitfields, the output strings are seperated
* if the s field is positive.
*/
static char *
bittok2str_internal(register const struct tok *lp, register const char *fmt,
register u_int v, const char *sep)
{
static char buf[256]; /* our stringbuffer */
int buflen=0;
register u_int rotbit; /* this is the bit we rotate through all bitpositions */
register u_int tokval;
const char * sepstr = "";
while (lp != NULL && lp->s != NULL) {
tokval=lp->v; /* load our first value */
rotbit=1;
while (rotbit != 0) {
/*
* lets AND the rotating bit with our token value
* and see if we have got a match
*/
if (tokval == (v&rotbit)) {
/* ok we have found something */
buflen+=snprintf(buf+buflen, sizeof(buf)-buflen, "%s%s",
sepstr, lp->s);
sepstr = sep;
break;
}
rotbit=rotbit<<1; /* no match - lets shift and try again */
}
lp++;
}
if (buflen == 0)
/* bummer - lets print the "unknown" message as advised in the fmt string if we got one */
(void)snprintf(buf, sizeof(buf), fmt == NULL ? "#%08x" : fmt, v);
return (buf);
}
/*
* Convert a bit token value to a string; use "fmt" if not found.
* this is useful for parsing bitfields, the output strings are not seperated.
*/
char *
bittok2str_nosep(register const struct tok *lp, register const char *fmt,
register u_int v)
{
return (bittok2str_internal(lp, fmt, v, ""));
}
/*
* Convert a bit token value to a string; use "fmt" if not found.
* this is useful for parsing bitfields, the output strings are comma seperated.
*/
char *
bittok2str(register const struct tok *lp, register const char *fmt,
register u_int v)
{
return (bittok2str_internal(lp, fmt, v, ", "));
}
/*
* Convert a value to a string using an array; the macro
* tok2strary() in <interface.h> is the public interface to
* this function and ensures that the second argument is
* correct for bounds-checking.
*/
const char *
tok2strary_internal(register const char **lp, int n, register const char *fmt,
register int v)
{
static char buf[128];
if (v >= 0 && v < n && lp[v] != NULL)
return lp[v];
if (fmt == NULL)
fmt = "#%d";
(void)snprintf(buf, sizeof(buf), fmt, v);
return (buf);
}
/*
* Convert a 32-bit netmask to prefixlen if possible
* the function returns the prefix-len; if plen == -1
* then conversion was not possible;
*/
int
mask2plen(uint32_t mask)
{
uint32_t bitmasks[33] = {
0x00000000,
0x80000000, 0xc0000000, 0xe0000000, 0xf0000000,
0xf8000000, 0xfc000000, 0xfe000000, 0xff000000,
0xff800000, 0xffc00000, 0xffe00000, 0xfff00000,
0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000,
0xffff8000, 0xffffc000, 0xffffe000, 0xfffff000,
0xfffff800, 0xfffffc00, 0xfffffe00, 0xffffff00,
0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0,
0xfffffff8, 0xfffffffc, 0xfffffffe, 0xffffffff
};
int prefix_len = 32;
/* let's see if we can transform the mask into a prefixlen */
while (prefix_len >= 0) {
if (bitmasks[prefix_len] == mask)
break;
prefix_len--;
}
return (prefix_len);
}
#ifdef INET6
int
mask62plen(const u_char *mask)
{
u_char bitmasks[9] = {
0x00,
0x80, 0xc0, 0xe0, 0xf0,
0xf8, 0xfc, 0xfe, 0xff
};
int byte;
int cidr_len = 0;
for (byte = 0; byte < 16; byte++) {
u_int bits;
for (bits = 0; bits < (sizeof (bitmasks) / sizeof (bitmasks[0])); bits++) {
if (mask[byte] == bitmasks[bits]) {
cidr_len += bits;
break;
}
}
if (mask[byte] != 0xff)
break;
}
return (cidr_len);
}
#endif /* INET6 */
/*
* Routine to print out information for text-based protocols such as FTP,
* HTTP, SMTP, RTSP, SIP, ....
*/
#define MAX_TOKEN 128
/*
* Fetch a token from a packet, starting at the specified index,
* and return the length of the token.
*
* Returns 0 on error; yes, this is indistinguishable from an empty
* token, but an "empty token" isn't a valid token - it just means
* either a space character at the beginning of the line (this
* includes a blank line) or no more tokens remaining on the line.
*/
static int
fetch_token(netdissect_options *ndo, const u_char *pptr, u_int idx, u_int len,
u_char *tbuf, size_t tbuflen)
{
size_t toklen = 0;
for (; idx < len; idx++) {
if (!ND_TTEST(*(pptr + idx))) {
/* ran past end of captured data */
return (0);
}
if (!isascii(*(pptr + idx))) {
/* not an ASCII character */
return (0);
}
if (isspace(*(pptr + idx))) {
/* end of token */
break;
}
if (!isprint(*(pptr + idx))) {
/* not part of a command token or response code */
return (0);
}
if (toklen + 2 > tbuflen) {
/* no room for this character and terminating '\0' */
return (0);
}
tbuf[toklen] = *(pptr + idx);
toklen++;
}
if (toklen == 0) {
/* no token */
return (0);
}
tbuf[toklen] = '\0';
/*
* Skip past any white space after the token, until we see
* an end-of-line (CR or LF).
*/
for (; idx < len; idx++) {
if (!ND_TTEST(*(pptr + idx))) {
/* ran past end of captured data */
break;
}
if (*(pptr + idx) == '\r' || *(pptr + idx) == '\n') {
/* end of line */
break;
}
if (!isascii(*(pptr + idx)) || !isprint(*(pptr + idx))) {
/* not a printable ASCII character */
break;
}
if (!isspace(*(pptr + idx))) {
/* beginning of next token */
break;
}
}
return (idx);
}
/*
* Scan a buffer looking for a line ending - LF or CR-LF.
* Return the index of the character after the line ending or 0 if
* we encounter a non-ASCII or non-printable character or don't find
* the line ending.
*/
static u_int
print_txt_line(netdissect_options *ndo, const char *protoname,
const char *prefix, const u_char *pptr, u_int idx, u_int len)
{
u_int startidx;
u_int linelen;
startidx = idx;
while (idx < len) {
ND_TCHECK(*(pptr+idx));
if (*(pptr+idx) == '\n') {
/*
* LF without CR; end of line.
* Skip the LF and print the line, with the
* exception of the LF.
*/
linelen = idx - startidx;
idx++;
goto print;
} else if (*(pptr+idx) == '\r') {
/* CR - any LF? */
if ((idx+1) >= len) {
/* not in this packet */
return (0);
}
ND_TCHECK(*(pptr+idx+1));
if (*(pptr+idx+1) == '\n') {
/*
* CR-LF; end of line.
* Skip the CR-LF and print the line, with
* the exception of the CR-LF.
*/
linelen = idx - startidx;
idx += 2;
goto print;
}
/*
* CR followed by something else; treat this
* as if it were binary data, and don't print
* it.
*/
return (0);
} else if (!isascii(*(pptr+idx)) ||
(!isprint(*(pptr+idx)) && *(pptr+idx) != '\t')) {
/*
* Not a printable ASCII character and not a tab;
* treat this as if it were binary data, and
* don't print it.
*/
return (0);
}
idx++;
}
/*
* All printable ASCII, but no line ending after that point
* in the buffer; treat this as if it were truncated.
*/
trunc:
linelen = idx - startidx;
ND_PRINT((ndo, "%s%.*s[!%s]", prefix, (int)linelen, pptr + startidx,
protoname));
return (0);
print:
ND_PRINT((ndo, "%s%.*s", prefix, (int)linelen, pptr + startidx));
return (idx);
}
void
txtproto_print(netdissect_options *ndo, const u_char *pptr, u_int len,
const char *protoname, const char **cmds, u_int flags)
{
u_int idx, eol;
u_char token[MAX_TOKEN+1];
const char *cmd;
int is_reqresp = 0;
const char *pnp;
if (cmds != NULL) {
/*
* This protocol has more than just request and
* response lines; see whether this looks like a
* request or response.
*/
idx = fetch_token(ndo, pptr, 0, len, token, sizeof(token));
if (idx != 0) {
/* Is this a valid request name? */
while ((cmd = *cmds++) != NULL) {
if (strcasecmp((const char *)token, cmd) == 0) {
/* Yes. */
is_reqresp = 1;
break;
}
}
/*
* No - is this a valid response code (3 digits)?
*
* Is this token the response code, or is the next
* token the response code?
*/
if (flags & RESP_CODE_SECOND_TOKEN) {
/*
* Next token - get it.
*/
idx = fetch_token(ndo, pptr, idx, len, token,
sizeof(token));
}
if (idx != 0) {
if (isdigit(token[0]) && isdigit(token[1]) &&
isdigit(token[2]) && token[3] == '\0') {
/* Yes. */
is_reqresp = 1;
}
}
}
} else {
/*
* This protocol has only request and response lines
* (e.g., FTP, where all the data goes over a
* different connection); assume the payload is
* a request or response.
*/
is_reqresp = 1;
}
/* Capitalize the protocol name */
for (pnp = protoname; *pnp != '\0'; pnp++)
ND_PRINT((ndo, "%c", toupper(*pnp)));
if (is_reqresp) {
/*
* In non-verbose mode, just print the protocol, followed
* by the first line as the request or response info.
*
* In verbose mode, print lines as text until we run out
* of characters or see something that's not a
* printable-ASCII line.
*/
if (ndo->ndo_vflag) {
/*
* We're going to print all the text lines in the
* request or response; just print the length
* on the first line of the output.
*/
ND_PRINT((ndo, ", length: %u", len));
for (idx = 0;
idx < len && (eol = print_txt_line(ndo, protoname, "\n\t", pptr, idx, len)) != 0;
idx = eol)
;
} else {
/*
* Just print the first text line.
*/
print_txt_line(ndo, protoname, ": ", pptr, 0, len);
}
}
}
/* VARARGS */
void
error(const char *fmt, ...)
{
va_list ap;
(void)fprintf(stderr, "%s: ", program_name);
va_start(ap, fmt);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
if (*fmt) {
fmt += strlen(fmt);
if (fmt[-1] != '\n')
(void)fputc('\n', stderr);
}
exit(1);
/* NOTREACHED */
}
/* VARARGS */
void
warning(const char *fmt, ...)
{
va_list ap;
(void)fprintf(stderr, "%s: WARNING: ", program_name);
va_start(ap, fmt);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
if (*fmt) {
fmt += strlen(fmt);
if (fmt[-1] != '\n')
(void)fputc('\n', stderr);
}
}
/*
* Copy arg vector into a new buffer, concatenating arguments with spaces.
*/
char *
copy_argv(register char **argv)
{
register char **p;
register u_int len = 0;
char *buf;
char *src, *dst;
p = argv;
if (*p == 0)
return 0;
while (*p)
len += strlen(*p++) + 1;
buf = (char *)malloc(len);
if (buf == NULL)
error("copy_argv: malloc");
p = argv;
dst = buf;
while ((src = *p++) != NULL) {
while ((*dst++ = *src++) != '\0')
;
dst[-1] = ' ';
}
dst[-1] = '\0';
return buf;
}
/*
* On Windows, we need to open the file in binary mode, so that
* we get all the bytes specified by the size we get from "fstat()".
* On UNIX, that's not necessary. O_BINARY is defined on Windows;
* we define it as 0 if it's not defined, so it does nothing.
*/
#ifndef O_BINARY
#define O_BINARY 0
#endif
char *
read_infile(char *fname)
{
register int i, fd, cc;
register char *cp;
struct stat buf;
fd = open(fname, O_RDONLY|O_BINARY);
if (fd < 0)
error("can't open %s: %s", fname, pcap_strerror(errno));
if (fstat(fd, &buf) < 0)
error("can't stat %s: %s", fname, pcap_strerror(errno));
cp = malloc((u_int)buf.st_size + 1);
if (cp == NULL)
error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
fname, pcap_strerror(errno));
cc = read(fd, cp, (u_int)buf.st_size);
if (cc < 0)
error("read %s: %s", fname, pcap_strerror(errno));
if (cc != buf.st_size)
error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
close(fd);
/* replace "# comment" with spaces */
for (i = 0; i < cc; i++) {
if (cp[i] == '#')
while (i < cc && cp[i] != '\n')
cp[i++] = ' ';
}
cp[cc] = '\0';
return (cp);
}
void
safeputs(netdissect_options *ndo,
const u_char *s, const u_int maxlen)
{
u_int idx = 0;
while (*s && idx < maxlen) {
safeputchar(ndo, *s);
idx++;
s++;
}
}
void
safeputchar(netdissect_options *ndo,
const u_char c)
{
ND_PRINT((ndo, (c < 0x80 && ND_ISPRINT(c)) ? "%c" : "\\0x%02x", c));
}
#ifdef LBL_ALIGN
/*
* Some compilers try to optimize memcpy(), using the alignment constraint
* on the argument pointer type. by using this function, we try to avoid the
* optimization.
*/
void
unaligned_memcpy(void *p, const void *q, size_t l)
{
memcpy(p, q, l);
}
/* As with memcpy(), so with memcmp(). */
int
unaligned_memcmp(const void *p, const void *q, size_t l)
{
return (memcmp(p, q, l));
}
#endif