freebsd-src/contrib/libpcap/etherent.c
Joseph Mingrone 6f9cba8f8b
libpcap: Update to 1.10.3
Local changes:

- In contrib/libpcap/pcap/bpf.h, do not include pcap/dlt.h.  Our system
  net/dlt.h is pulled in from net/bpf.h.
- sys/net/dlt.h: Incorporate changes from libpcap 1.10.3.
- lib/libpcap/Makefile: Update for libpcap 1.10.3.

Changelog:	https://git.tcpdump.org/libpcap/blob/95691ebe7564afa3faa5c6ba0dbd17e351be455a:/CHANGES
Reviewed by:	emaste
Obtained from:	https://www.tcpdump.org/release/libpcap-1.10.3.tar.gz
Sponsored by:	The FreeBSD Foundation
2023-03-31 16:02:22 -03:00

173 lines
3.7 KiB
C

/*
* Copyright (c) 1990, 1993, 1994, 1995, 1996
* 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pcap-types.h>
#include <memory.h>
#include <stdio.h>
#include <string.h>
#include "pcap-int.h"
#include <pcap/namedb.h>
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
static inline int skip_space(FILE *);
static inline int skip_line(FILE *);
/* Hex digit to integer. */
static inline u_char
xdtoi(u_char c)
{
if (c >= '0' && c <= '9')
return (u_char)(c - '0');
else if (c >= 'a' && c <= 'f')
return (u_char)(c - 'a' + 10);
else
return (u_char)(c - 'A' + 10);
}
/*
* Skip linear white space (space and tab) and any CRs before LF.
* Stop when we hit a non-white-space character or an end-of-line LF.
*/
static inline int
skip_space(FILE *f)
{
int c;
do {
c = getc(f);
} while (c == ' ' || c == '\t' || c == '\r');
return c;
}
static inline int
skip_line(FILE *f)
{
int c;
do
c = getc(f);
while (c != '\n' && c != EOF);
return c;
}
struct pcap_etherent *
pcap_next_etherent(FILE *fp)
{
register int c, i;
u_char d;
char *bp;
size_t namesize;
static struct pcap_etherent e;
memset((char *)&e, 0, sizeof(e));
for (;;) {
/* Find addr */
c = skip_space(fp);
if (c == EOF)
return (NULL);
if (c == '\n')
continue;
/* If this is a comment, or first thing on line
cannot be Ethernet address, skip the line. */
if (!PCAP_ISXDIGIT(c)) {
c = skip_line(fp);
if (c == EOF)
return (NULL);
continue;
}
/* must be the start of an address */
for (i = 0; i < 6; i += 1) {
d = xdtoi((u_char)c);
c = getc(fp);
if (c == EOF)
return (NULL);
if (PCAP_ISXDIGIT(c)) {
d <<= 4;
d |= xdtoi((u_char)c);
c = getc(fp);
if (c == EOF)
return (NULL);
}
e.addr[i] = d;
if (c != ':')
break;
c = getc(fp);
if (c == EOF)
return (NULL);
}
/* Must be whitespace */
if (c != ' ' && c != '\t' && c != '\r' && c != '\n') {
c = skip_line(fp);
if (c == EOF)
return (NULL);
continue;
}
c = skip_space(fp);
if (c == EOF)
return (NULL);
/* hit end of line... */
if (c == '\n')
continue;
if (c == '#') {
c = skip_line(fp);
if (c == EOF)
return (NULL);
continue;
}
/* pick up name */
bp = e.name;
/* Use 'namesize' to prevent buffer overflow. */
namesize = sizeof(e.name) - 1;
do {
*bp++ = (u_char)c;
c = getc(fp);
if (c == EOF)
return (NULL);
} while (c != ' ' && c != '\t' && c != '\r' && c != '\n'
&& --namesize != 0);
*bp = '\0';
/* Eat trailing junk */
if (c != '\n')
(void)skip_line(fp);
return &e;
}
}