Imported Upstream version 4.3.0upstream/4.3.0

1 files changed, 608 insertions, 0 deletions

diff --git a/util.c b/util.c
new file mode 100644
index 0000000..a2ef36d
--- /dev/null
+++ b/util.c
@@ -0,0 +1,608 @@
+/*
+ * 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.
+ */
+
+#ifndef lint
+static const char rcsid[] _U_ =
+    "@(#) $Header: /tcpdump/master/tcpdump/util.c,v 1.109 2007-01-29 09:59:42 hannes Exp $ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.h>
+
+#include <sys/stat.h>
+
+#include <errno.h>
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#include <pcap.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "interface.h"
+
+char * ts_format(register int, register int);
+
+/*
+ * 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(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 (!isascii(c)) {
+			c = toascii(c);
+			putchar('M');
+			putchar('-');
+		}
+		if (!isprint(c)) {
+			c ^= 0x40;	/* DEL to ?, others to alpha */
+			putchar('^');
+		}
+		putchar(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(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 (!isascii(c)) {
+			c = toascii(c);
+			putchar('M');
+			putchar('-');
+		}
+		if (!isprint(c)) {
+			c ^= 0x40;	/* DEL to ?, others to alpha */
+			putchar('^');
+		}
+		putchar(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(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 (!isascii(c)) {
+			c = toascii(c);
+			putchar('M');
+			putchar('-');
+		}
+		if (!isprint(c)) {
+			c ^= 0x40;	/* DEL to ?, others to alpha */
+			putchar('^');
+		}
+		putchar(c);
+	}
+	return (n == 0) ? 0 : ret;
+}
+
+/*
+ * Format the timestamp
+ */
+char *
+ts_format(register int sec, register int usec)
+{
+        static char buf[sizeof("00:00:00.000000")];
+        (void)snprintf(buf, sizeof(buf), "%02d:%02d:%02d.%06u",
+               sec / 3600, (sec % 3600) / 60, sec % 60, usec);
+
+        return buf;
+}
+
+/*
+ * Print the timestamp
+ */
+void
+ts_print(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 (tflag) {
+
+	case 0: /* Default */
+		s = (tvp->tv_sec + thiszone) % 86400;
+                (void)printf("%s ", ts_format(s, tvp->tv_usec));
+		break;
+
+	case 1: /* No time stamp */
+		break;
+
+	case 2: /* Unix timeval style */
+		(void)printf("%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--;
+                }
+
+                (void)printf("%s ", ts_format(d_sec, d_usec));
+
+                if (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)
+			printf("Date fail  ");
+		else
+			printf("%04d-%02d-%02d %s ",
+                               tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
+                               ts_format(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(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) {
+		(void)printf("0s");
+		return;
+	}
+	if (secs < 0) {
+		(void)printf("-");
+		secs = -secs;
+	}
+	while (secs > 0) {
+		if (secs >= *s) {
+			(void)printf("%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(const u_char *cp,const char *ident,int len)
+{
+	if (len < 0) {
+		printf("%sDissector error: print_unknown_data called with negative length",
+		    ident);
+		return(0);
+	}
+	if (snapend - cp < len)
+		len = snapend - cp;
+	if (len < 0) {
+		printf("%sDissector error: print_unknown_data called with pointer past end of packet",
+		    ident);
+		return(0);
+	}
+        hex_print(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 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 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 int v, register int sep)
+{
+        static char buf[256]; /* our stringbuffer */
+        int buflen=0;
+        register int rotbit; /* this is the bit we rotate through all bitpositions */
+        register int tokval;
+
+	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",
+                                     lp->s, sep ? ", " : "");
+                    break;
+                }
+                rotbit=rotbit<<1; /* no match - lets shift and try again */
+            }
+            lp++;
+	}
+
+        /* user didn't want string seperation - no need to cut off trailing seperators */
+        if (!sep) {
+            return (buf);
+        }
+
+        if (buflen != 0) { /* did we find anything */
+            /* yep, set the the trailing zero 2 bytes before to eliminate the last comma & whitespace */
+            buf[buflen-2] = '\0';
+            return (buf);
+        }
+        else {
+            /* bummer - lets print the "unknown" message as advised in the fmt string if we got one */
+            if (fmt == NULL)
+		fmt = "#%d";
+            (void)snprintf(buf, sizeof(buf), 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 int v)
+{
+    return (bittok2str_internal(lp, fmt, v, 0));
+}
+
+/*
+ * 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 int v)
+{
+    return (bittok2str_internal(lp, fmt, v, 1));
+}
+
+/*
+ * 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(u_int32_t mask)
+{
+	u_int32_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 */
+
+/* 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(const char *s, int maxlen)
+{
+	int idx = 0;
+
+	while (*s && idx < maxlen) {
+		safeputchar(*s);
+                idx++;
+		s++;
+	}
+}
+
+void
+safeputchar(int c)
+{
+	unsigned char ch;
+
+	ch = (unsigned char)(c & 0xff);
+	if (ch < 0x80 && isprint(ch))
+		printf("%c", ch);
+	else
+		printf("\\0x%02x", ch);
+}