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Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 608 |
1 files changed, 608 insertions, 0 deletions
@@ -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); +} |