util-print.c - platform/external/tcpdump - Git at Google

 /*
  * 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.
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <netdissect-stdinc.h>

 #include <sys/stat.h>

 #ifdef HAVE_FCNTL_H
 #include <fcntl.h>
 #endif
 #include <ctype.h>
 #include <stdio.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>

 #include "netdissect.h"
 #include "ascii_strcasecmp.h"
 #include "timeval-operations.h"

 int32_t thiszone;		/* seconds offset from gmt to local time */
 /* invalid string to print '(invalid)' for malformed or corrupted packets */
 const char istr[] = " (invalid)";

 /*
  * timestamp display buffer size, the biggest size of both formats is needed
  * sizeof("0000000000.000000000") > sizeof("00:00:00.000000000")
  */
 #define TS_BUF_SIZE sizeof("0000000000.000000000")

 #define TOKBUFSIZE 128

 /*
  * Print out a character, filtering out the non-printable ones
  */
 void
 fn_print_char(netdissect_options *ndo, u_char c)
 {
 	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));
 }

 /*
  * Print out a null-terminated filename (or other ascii string).
  * If ep is NULL, assume no truncation check is needed.
  * Return true if truncated.
  * Stop at ep (if given) or before the null char, whichever is first.
  */
 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.
  * Stop at ep (if given) or after n bytes, whichever is first.
  */
 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.
  * Stop at ep (if given) or after n bytes or before the null char,
  * whichever is first.
  */
 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, char *buf)
 {
 	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}";
 		break;
 	}
 #else
 	format = "%02d:%02d:%02d.%06u";
 #endif

 	snprintf(buf, TS_BUF_SIZE, format,
                  sec / 3600, (sec % 3600) / 60, sec % 60, usec);

         return buf;
 }

 /*
  * Format the timestamp - Unix timeval style
  */
 static char *
 ts_unix_format(netdissect_options *ndo
 #ifndef HAVE_PCAP_SET_TSTAMP_PRECISION
 _U_
 #endif
 , int sec, int usec, char *buf)
 {
 	const char *format;

 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
 	switch (ndo->ndo_tstamp_precision) {

 	case PCAP_TSTAMP_PRECISION_MICRO:
 		format = "%u.%06u";
 		break;

 	case PCAP_TSTAMP_PRECISION_NANO:
 		format = "%u.%09u";
 		break;

 	default:
 		format = "%u.{unknown}";
 		break;
 	}
 #else
 	format = "%u.%06u";
 #endif

 	snprintf(buf, TS_BUF_SIZE, format,
 		 (unsigned)sec, (unsigned)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;
 	char buf[TS_BUF_SIZE];
 	static struct timeval tv_ref;
 	struct timeval tv_result;
 	int negative_offset;
 	int nano_prec;

 	switch (ndo->ndo_tflag) {

 	case 0: /* Default */
 		s = (tvp->tv_sec + thiszone) % 86400;
 		ND_PRINT((ndo, "%s ", ts_format(ndo, s, tvp->tv_usec, buf)));
 		break;

 	case 1: /* No time stamp */
 		break;

 	case 2: /* Unix timeval style */
 		ND_PRINT((ndo, "%s ", ts_unix_format(ndo,
 			  tvp->tv_sec, tvp->tv_usec, buf)));
 		break;

 	case 3: /* Microseconds/nanoseconds since previous packet */
         case 5: /* Microseconds/nanoseconds since first packet */
 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
 		switch (ndo->ndo_tstamp_precision) {
 		case PCAP_TSTAMP_PRECISION_MICRO:
 			nano_prec = 0;
 			break;
 		case PCAP_TSTAMP_PRECISION_NANO:
 			nano_prec = 1;
 			break;
 		default:
 			nano_prec = 0;
 			break;
 		}
 #else
 		nano_prec = 0;
 #endif
 		if (!(netdissect_timevalisset(&tv_ref)))
 			tv_ref = *tvp; /* set timestamp for first packet */

 		negative_offset = netdissect_timevalcmp(tvp, &tv_ref, <);
 		if (negative_offset)
 			netdissect_timevalsub(&tv_ref, tvp, &tv_result, nano_prec);
 		else
 			netdissect_timevalsub(tvp, &tv_ref, &tv_result, nano_prec);

 		ND_PRINT((ndo, (negative_offset ? "-" : " ")));

 		ND_PRINT((ndo, "%s ", ts_format(ndo,
 			  tv_result.tv_sec, tv_result.tv_usec, buf)));

                 if (ndo->ndo_tflag == 3)
 			tv_ref = *tvp; /* set timestamp for previous packet */
 		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, buf)));
 		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][TOKBUFSIZE];
 	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 <netdissect.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[TOKBUFSIZE];

 	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);
 }

 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);
 }

 /*
  * 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 (ascii_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((u_char)*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);
 		}
 	}
 }

 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
	/*
	* 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.
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <netdissect-stdinc.h>

	#include <sys/stat.h>

	#ifdef HAVE_FCNTL_H
	#include <fcntl.h>
	#endif
	#include <ctype.h>
	#include <stdio.h>
	#include <stdarg.h>
	#include <stdlib.h>
	#include <string.h>

	#include "netdissect.h"
	#include "ascii_strcasecmp.h"
	#include "timeval-operations.h"

	int32_t thiszone; /* seconds offset from gmt to local time */
	/* invalid string to print '(invalid)' for malformed or corrupted packets */
	const char istr[] = " (invalid)";

	/*
	* timestamp display buffer size, the biggest size of both formats is needed
	* sizeof("0000000000.000000000") > sizeof("00:00:00.000000000")
	*/
	#define TS_BUF_SIZE sizeof("0000000000.000000000")

	#define TOKBUFSIZE 128

	/*
	* Print out a character, filtering out the non-printable ones
	*/
	void
	fn_print_char(netdissect_options *ndo, u_char c)
	{
	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));
	}

	/*
	* Print out a null-terminated filename (or other ascii string).
	* If ep is NULL, assume no truncation check is needed.
	* Return true if truncated.
	* Stop at ep (if given) or before the null char, whichever is first.
	*/
	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.
	* Stop at ep (if given) or after n bytes, whichever is first.
	*/
	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.
	* Stop at ep (if given) or after n bytes or before the null char,
	* whichever is first.
	*/
	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, char *buf)
	{
	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}";
	break;
	}
	#else
	format = "%02d:%02d:%02d.%06u";
	#endif

	snprintf(buf, TS_BUF_SIZE, format,
	sec / 3600, (sec % 3600) / 60, sec % 60, usec);

	return buf;
	}

	/*
	* Format the timestamp - Unix timeval style
	*/
	static char *
	ts_unix_format(netdissect_options *ndo
	#ifndef HAVE_PCAP_SET_TSTAMP_PRECISION
	_U_
	#endif
	, int sec, int usec, char *buf)
	{
	const char *format;

	#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
	switch (ndo->ndo_tstamp_precision) {

	case PCAP_TSTAMP_PRECISION_MICRO:
	format = "%u.%06u";
	break;

	case PCAP_TSTAMP_PRECISION_NANO:
	format = "%u.%09u";
	break;

	default:
	format = "%u.{unknown}";
	break;
	}
	#else
	format = "%u.%06u";
	#endif

	snprintf(buf, TS_BUF_SIZE, format,
	(unsigned)sec, (unsigned)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;
	char buf[TS_BUF_SIZE];
	static struct timeval tv_ref;
	struct timeval tv_result;
	int negative_offset;
	int nano_prec;

	switch (ndo->ndo_tflag) {

	case 0: /* Default */
	s = (tvp->tv_sec + thiszone) % 86400;
	ND_PRINT((ndo, "%s ", ts_format(ndo, s, tvp->tv_usec, buf)));
	break;

	case 1: /* No time stamp */
	break;

	case 2: /* Unix timeval style */
	ND_PRINT((ndo, "%s ", ts_unix_format(ndo,
	tvp->tv_sec, tvp->tv_usec, buf)));
	break;

	case 3: /* Microseconds/nanoseconds since previous packet */
	case 5: /* Microseconds/nanoseconds since first packet */
	#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
	switch (ndo->ndo_tstamp_precision) {
	case PCAP_TSTAMP_PRECISION_MICRO:
	nano_prec = 0;
	break;
	case PCAP_TSTAMP_PRECISION_NANO:
	nano_prec = 1;
	break;
	default:
	nano_prec = 0;
	break;
	}
	#else
	nano_prec = 0;
	#endif
	if (!(netdissect_timevalisset(&tv_ref)))
	tv_ref = tvp; / set timestamp for first packet */

	negative_offset = netdissect_timevalcmp(tvp, &tv_ref, <);
	if (negative_offset)
	netdissect_timevalsub(&tv_ref, tvp, &tv_result, nano_prec);
	else
	netdissect_timevalsub(tvp, &tv_ref, &tv_result, nano_prec);

	ND_PRINT((ndo, (negative_offset ? "-" : " ")));

	ND_PRINT((ndo, "%s ", ts_format(ndo,
	tv_result.tv_sec, tv_result.tv_usec, buf)));

	if (ndo->ndo_tflag == 3)
	tv_ref = tvp; / set timestamp for previous packet */
	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, buf)));
	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][TOKBUFSIZE];
	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 <netdissect.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[TOKBUFSIZE];

	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);
	}

	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);
	}

	/*
	* 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 (ascii_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((u_char)*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);
	}
	}
	}

	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