/* * 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 1.95.2.6 2006/02/08 01:40:09 hannes Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #ifdef HAVE_FCNTL_H #include #endif #include #include #include #include #include #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(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; } /* * 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; switch (tflag) { case 0: /* Default */ s = (tvp->tv_sec + thiszone) % 86400; (void)printf("%02d:%02d:%02d.%06u ", s / 3600, (s % 3600) / 60, s % 60, (unsigned)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 */ if (b_sec == 0) { printf("000000 "); } else { int d_usec = tvp->tv_usec - b_usec; int d_sec = tvp->tv_sec - b_sec; while (d_usec < 0) { d_usec += 1000000; d_sec--; } if (d_sec) printf("%d. ", d_sec); printf("%06d ", d_usec); } 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 ", tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday); printf("%02d:%02d:%02d.%06u ", s / 3600, (s % 3600) / 60, s % 60, (unsigned)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 comma seperated */ char * bittok2str(register const struct tok *lp, register const char *fmt, register int v) { 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->s != NULL && lp != 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, ",lp->s); break; } rotbit=rotbit<<1; /* no match - lets shift and try again */ } lp++; } 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 value to a string using an array; the macro * tok2strary() in 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); } /* 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("\\%03o", ch); }