169 lines
3.4 KiB
C
169 lines
3.4 KiB
C
/*
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* Copyright (c) 1990, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <pcap-types.h>
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#include <ctype.h>
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#include <memory.h>
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#include <stdio.h>
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#include <string.h>
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#include "pcap-int.h"
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#include <pcap/namedb.h>
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#ifdef HAVE_OS_PROTO_H
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#include "os-proto.h"
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#endif
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static inline int skip_space(FILE *);
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static inline int skip_line(FILE *);
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/* Hex digit to integer. */
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static inline u_char
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xdtoi(u_char c)
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{
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if (isdigit(c))
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return (u_char)(c - '0');
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else if (islower(c))
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return (u_char)(c - 'a' + 10);
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else
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return (u_char)(c - 'A' + 10);
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}
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static inline int
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skip_space(FILE *f)
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{
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int c;
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do {
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c = getc(f);
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} while (isspace(c) && c != '\n');
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return c;
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}
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static inline int
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skip_line(FILE *f)
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{
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int c;
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do
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c = getc(f);
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while (c != '\n' && c != EOF);
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return c;
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}
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struct pcap_etherent *
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pcap_next_etherent(FILE *fp)
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{
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register int c, i;
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u_char d;
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char *bp;
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size_t namesize;
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static struct pcap_etherent e;
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memset((char *)&e, 0, sizeof(e));
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for (;;) {
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/* Find addr */
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c = skip_space(fp);
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if (c == EOF)
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return (NULL);
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if (c == '\n')
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continue;
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/* If this is a comment, or first thing on line
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cannot be Ethernet address, skip the line. */
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if (!isxdigit(c)) {
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c = skip_line(fp);
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if (c == EOF)
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return (NULL);
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continue;
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}
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/* must be the start of an address */
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for (i = 0; i < 6; i += 1) {
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d = xdtoi((u_char)c);
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c = getc(fp);
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if (c == EOF)
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return (NULL);
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if (isxdigit(c)) {
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d <<= 4;
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d |= xdtoi((u_char)c);
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c = getc(fp);
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if (c == EOF)
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return (NULL);
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}
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e.addr[i] = d;
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if (c != ':')
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break;
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c = getc(fp);
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if (c == EOF)
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return (NULL);
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}
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/* Must be whitespace */
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if (!isspace(c)) {
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c = skip_line(fp);
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if (c == EOF)
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return (NULL);
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continue;
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}
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c = skip_space(fp);
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if (c == EOF)
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return (NULL);
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/* hit end of line... */
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if (c == '\n')
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continue;
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if (c == '#') {
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c = skip_line(fp);
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if (c == EOF)
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return (NULL);
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continue;
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}
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/* pick up name */
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bp = e.name;
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/* Use 'namesize' to prevent buffer overflow. */
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namesize = sizeof(e.name) - 1;
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do {
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*bp++ = (u_char)c;
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c = getc(fp);
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if (c == EOF)
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return (NULL);
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} while (!isspace(c) && --namesize != 0);
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*bp = '\0';
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/* Eat trailing junk */
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if (c != '\n')
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(void)skip_line(fp);
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return &e;
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}
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}
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