mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-20 11:11:24 +00:00
615 lines
16 KiB
C
615 lines
16 KiB
C
|
/*
|
||
|
* Copyright (c) 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.
|
||
|
*
|
||
|
* sf-pcap.c - libpcap-file-format-specific code from savefile.c
|
||
|
* Extraction/creation by Jeffrey Mogul, DECWRL
|
||
|
* Modified by Steve McCanne, LBL.
|
||
|
*
|
||
|
* Used to save the received packet headers, after filtering, to
|
||
|
* a file, and then read them later.
|
||
|
* The first record in the file contains saved values for the machine
|
||
|
* dependent values so we can print the dump file on any architecture.
|
||
|
*/
|
||
|
|
||
|
#ifndef lint
|
||
|
static const char rcsid[] _U_ =
|
||
|
"@(#) $Header$ (LBL)";
|
||
|
#endif
|
||
|
|
||
|
#ifdef HAVE_CONFIG_H
|
||
|
#include "config.h"
|
||
|
#endif
|
||
|
|
||
|
#ifdef WIN32
|
||
|
#include <pcap-stdinc.h>
|
||
|
#else /* WIN32 */
|
||
|
#if HAVE_INTTYPES_H
|
||
|
#include <inttypes.h>
|
||
|
#elif HAVE_STDINT_H
|
||
|
#include <stdint.h>
|
||
|
#endif
|
||
|
#ifdef HAVE_SYS_BITYPES_H
|
||
|
#include <sys/bitypes.h>
|
||
|
#endif
|
||
|
#include <sys/types.h>
|
||
|
#endif /* WIN32 */
|
||
|
|
||
|
#include <errno.h>
|
||
|
#include <memory.h>
|
||
|
#include <stdio.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
|
||
|
#include "pcap-int.h"
|
||
|
|
||
|
#include "pcap-common.h"
|
||
|
|
||
|
#ifdef HAVE_OS_PROTO_H
|
||
|
#include "os-proto.h"
|
||
|
#endif
|
||
|
|
||
|
#include "sf-pcap.h"
|
||
|
|
||
|
/*
|
||
|
* Setting O_BINARY on DOS/Windows is a bit tricky
|
||
|
*/
|
||
|
#if defined(WIN32)
|
||
|
#define SET_BINMODE(f) _setmode(_fileno(f), _O_BINARY)
|
||
|
#elif defined(MSDOS)
|
||
|
#if defined(__HIGHC__)
|
||
|
#define SET_BINMODE(f) setmode(f, O_BINARY)
|
||
|
#else
|
||
|
#define SET_BINMODE(f) setmode(fileno(f), O_BINARY)
|
||
|
#endif
|
||
|
#endif
|
||
|
|
||
|
/*
|
||
|
* Standard libpcap format.
|
||
|
*/
|
||
|
#define TCPDUMP_MAGIC 0xa1b2c3d4
|
||
|
|
||
|
/*
|
||
|
* Alexey Kuznetzov's modified libpcap format.
|
||
|
*/
|
||
|
#define KUZNETZOV_TCPDUMP_MAGIC 0xa1b2cd34
|
||
|
|
||
|
/*
|
||
|
* Reserved for Francisco Mesquita <francisco.mesquita@radiomovel.pt>
|
||
|
* for another modified format.
|
||
|
*/
|
||
|
#define FMESQUITA_TCPDUMP_MAGIC 0xa1b234cd
|
||
|
|
||
|
/*
|
||
|
* Navtel Communcations' format, with nanosecond timestamps,
|
||
|
* as per a request from Dumas Hwang <dumas.hwang@navtelcom.com>.
|
||
|
*/
|
||
|
#define NAVTEL_TCPDUMP_MAGIC 0xa12b3c4d
|
||
|
|
||
|
/*
|
||
|
* Normal libpcap format, except for seconds/nanoseconds timestamps,
|
||
|
* as per a request by Ulf Lamping <ulf.lamping@web.de>
|
||
|
*/
|
||
|
#define NSEC_TCPDUMP_MAGIC 0xa1b23c4d
|
||
|
|
||
|
/*
|
||
|
* Mechanism for storing information about a capture in the upper
|
||
|
* 6 bits of a linktype value in a capture file.
|
||
|
*
|
||
|
* LT_LINKTYPE_EXT(x) extracts the additional information.
|
||
|
*
|
||
|
* The rest of the bits are for a value describing the link-layer
|
||
|
* value. LT_LINKTYPE(x) extracts that value.
|
||
|
*/
|
||
|
#define LT_LINKTYPE(x) ((x) & 0x03FFFFFF)
|
||
|
#define LT_LINKTYPE_EXT(x) ((x) & 0xFC000000)
|
||
|
|
||
|
static int pcap_next_packet(pcap_t *p, struct pcap_pkthdr *hdr, u_char **datap);
|
||
|
|
||
|
/*
|
||
|
* Check whether this is a pcap savefile and, if it is, extract the
|
||
|
* relevant information from the header.
|
||
|
*/
|
||
|
int
|
||
|
pcap_check_header(pcap_t *p, bpf_u_int32 magic, FILE *fp, char *errbuf)
|
||
|
{
|
||
|
struct pcap_file_header hdr;
|
||
|
size_t amt_read;
|
||
|
|
||
|
/*
|
||
|
* Check whether the first 4 bytes of the file are the magic
|
||
|
* number for a pcap savefile, or for a byte-swapped pcap
|
||
|
* savefile.
|
||
|
*/
|
||
|
if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) {
|
||
|
magic = SWAPLONG(magic);
|
||
|
if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC)
|
||
|
return (0); /* nope */
|
||
|
p->sf.swapped = 1;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* They are. Put the magic number in the header, and read
|
||
|
* the rest of the header.
|
||
|
*/
|
||
|
hdr.magic = magic;
|
||
|
amt_read = fread(((char *)&hdr) + sizeof hdr.magic, 1,
|
||
|
sizeof(hdr) - sizeof(hdr.magic), fp);
|
||
|
if (amt_read != sizeof(hdr) - sizeof(hdr.magic)) {
|
||
|
if (ferror(fp)) {
|
||
|
snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"error reading dump file: %s",
|
||
|
pcap_strerror(errno));
|
||
|
} else {
|
||
|
snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"truncated dump file; tried to read %lu file header bytes, only got %lu",
|
||
|
(unsigned long)sizeof(hdr),
|
||
|
(unsigned long)amt_read);
|
||
|
}
|
||
|
return (-1);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* If it's a byte-swapped capture file, byte-swap the header.
|
||
|
*/
|
||
|
if (p->sf.swapped) {
|
||
|
hdr.version_major = SWAPSHORT(hdr.version_major);
|
||
|
hdr.version_minor = SWAPSHORT(hdr.version_minor);
|
||
|
hdr.thiszone = SWAPLONG(hdr.thiszone);
|
||
|
hdr.sigfigs = SWAPLONG(hdr.sigfigs);
|
||
|
hdr.snaplen = SWAPLONG(hdr.snaplen);
|
||
|
hdr.linktype = SWAPLONG(hdr.linktype);
|
||
|
}
|
||
|
|
||
|
if (hdr.version_major < PCAP_VERSION_MAJOR) {
|
||
|
snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"archaic pcap savefile format");
|
||
|
return (-1);
|
||
|
}
|
||
|
p->sf.version_major = hdr.version_major;
|
||
|
p->sf.version_minor = hdr.version_minor;
|
||
|
p->tzoff = hdr.thiszone;
|
||
|
p->snapshot = hdr.snaplen;
|
||
|
p->linktype = linktype_to_dlt(LT_LINKTYPE(hdr.linktype));
|
||
|
p->linktype_ext = LT_LINKTYPE_EXT(hdr.linktype);
|
||
|
|
||
|
p->sf.next_packet_op = pcap_next_packet;
|
||
|
|
||
|
/*
|
||
|
* We interchanged the caplen and len fields at version 2.3,
|
||
|
* in order to match the bpf header layout. But unfortunately
|
||
|
* some files were written with version 2.3 in their headers
|
||
|
* but without the interchanged fields.
|
||
|
*
|
||
|
* In addition, DG/UX tcpdump writes out files with a version
|
||
|
* number of 543.0, and with the caplen and len fields in the
|
||
|
* pre-2.3 order.
|
||
|
*/
|
||
|
switch (hdr.version_major) {
|
||
|
|
||
|
case 2:
|
||
|
if (hdr.version_minor < 3)
|
||
|
p->sf.lengths_swapped = SWAPPED;
|
||
|
else if (hdr.version_minor == 3)
|
||
|
p->sf.lengths_swapped = MAYBE_SWAPPED;
|
||
|
else
|
||
|
p->sf.lengths_swapped = NOT_SWAPPED;
|
||
|
break;
|
||
|
|
||
|
case 543:
|
||
|
p->sf.lengths_swapped = SWAPPED;
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
p->sf.lengths_swapped = NOT_SWAPPED;
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
if (magic == KUZNETZOV_TCPDUMP_MAGIC) {
|
||
|
/*
|
||
|
* XXX - the patch that's in some versions of libpcap
|
||
|
* changes the packet header but not the magic number,
|
||
|
* and some other versions with this magic number have
|
||
|
* some extra debugging information in the packet header;
|
||
|
* we'd have to use some hacks^H^H^H^H^Hheuristics to
|
||
|
* detect those variants.
|
||
|
*
|
||
|
* Ethereal does that, but it does so by trying to read
|
||
|
* the first two packets of the file with each of the
|
||
|
* record header formats. That currently means it seeks
|
||
|
* backwards and retries the reads, which doesn't work
|
||
|
* on pipes. We want to be able to read from a pipe, so
|
||
|
* that strategy won't work; we'd have to buffer some
|
||
|
* data ourselves and read from that buffer in order to
|
||
|
* make that work.
|
||
|
*/
|
||
|
p->sf.hdrsize = sizeof(struct pcap_sf_patched_pkthdr);
|
||
|
|
||
|
if (p->linktype == DLT_EN10MB) {
|
||
|
/*
|
||
|
* This capture might have been done in raw mode
|
||
|
* or cooked mode.
|
||
|
*
|
||
|
* If it was done in cooked mode, p->snapshot was
|
||
|
* passed to recvfrom() as the buffer size, meaning
|
||
|
* that the most packet data that would be copied
|
||
|
* would be p->snapshot. However, a faked Ethernet
|
||
|
* header would then have been added to it, so the
|
||
|
* most data that would be in a packet in the file
|
||
|
* would be p->snapshot + 14.
|
||
|
*
|
||
|
* We can't easily tell whether the capture was done
|
||
|
* in raw mode or cooked mode, so we'll assume it was
|
||
|
* cooked mode, and add 14 to the snapshot length.
|
||
|
* That means that, for a raw capture, the snapshot
|
||
|
* length will be misleading if you use it to figure
|
||
|
* out why a capture doesn't have all the packet data,
|
||
|
* but there's not much we can do to avoid that.
|
||
|
*/
|
||
|
p->snapshot += 14;
|
||
|
}
|
||
|
} else
|
||
|
p->sf.hdrsize = sizeof(struct pcap_sf_pkthdr);
|
||
|
|
||
|
/*
|
||
|
* Allocate a buffer for the packet data.
|
||
|
*/
|
||
|
p->bufsize = p->snapshot;
|
||
|
if (p->bufsize <= 0)
|
||
|
p->bufsize = BPF_MAXBUFSIZE;
|
||
|
p->buffer = malloc(p->bufsize);
|
||
|
if (p->buffer == NULL) {
|
||
|
snprintf(errbuf, PCAP_ERRBUF_SIZE, "out of memory");
|
||
|
return (-1);
|
||
|
}
|
||
|
|
||
|
return (1);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Read and return the next packet from the savefile. Return the header
|
||
|
* in hdr and a pointer to the contents in data. Return 0 on success, 1
|
||
|
* if there were no more packets, and -1 on an error.
|
||
|
*/
|
||
|
static int
|
||
|
pcap_next_packet(pcap_t *p, struct pcap_pkthdr *hdr, u_char **data)
|
||
|
{
|
||
|
struct pcap_sf_patched_pkthdr sf_hdr;
|
||
|
FILE *fp = p->sf.rfile;
|
||
|
size_t amt_read;
|
||
|
bpf_u_int32 t;
|
||
|
|
||
|
/*
|
||
|
* Read the packet header; the structure we use as a buffer
|
||
|
* is the longer structure for files generated by the patched
|
||
|
* libpcap, but if the file has the magic number for an
|
||
|
* unpatched libpcap we only read as many bytes as the regular
|
||
|
* header has.
|
||
|
*/
|
||
|
amt_read = fread(&sf_hdr, 1, p->sf.hdrsize, fp);
|
||
|
if (amt_read != p->sf.hdrsize) {
|
||
|
if (ferror(fp)) {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"error reading dump file: %s",
|
||
|
pcap_strerror(errno));
|
||
|
return (-1);
|
||
|
} else {
|
||
|
if (amt_read != 0) {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"truncated dump file; tried to read %lu header bytes, only got %lu",
|
||
|
(unsigned long)p->sf.hdrsize,
|
||
|
(unsigned long)amt_read);
|
||
|
return (-1);
|
||
|
}
|
||
|
/* EOF */
|
||
|
return (1);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (p->sf.swapped) {
|
||
|
/* these were written in opposite byte order */
|
||
|
hdr->caplen = SWAPLONG(sf_hdr.caplen);
|
||
|
hdr->len = SWAPLONG(sf_hdr.len);
|
||
|
hdr->ts.tv_sec = SWAPLONG(sf_hdr.ts.tv_sec);
|
||
|
hdr->ts.tv_usec = SWAPLONG(sf_hdr.ts.tv_usec);
|
||
|
} else {
|
||
|
hdr->caplen = sf_hdr.caplen;
|
||
|
hdr->len = sf_hdr.len;
|
||
|
hdr->ts.tv_sec = sf_hdr.ts.tv_sec;
|
||
|
hdr->ts.tv_usec = sf_hdr.ts.tv_usec;
|
||
|
}
|
||
|
/* Swap the caplen and len fields, if necessary. */
|
||
|
switch (p->sf.lengths_swapped) {
|
||
|
|
||
|
case NOT_SWAPPED:
|
||
|
break;
|
||
|
|
||
|
case MAYBE_SWAPPED:
|
||
|
if (hdr->caplen <= hdr->len) {
|
||
|
/*
|
||
|
* The captured length is <= the actual length,
|
||
|
* so presumably they weren't swapped.
|
||
|
*/
|
||
|
break;
|
||
|
}
|
||
|
/* FALLTHROUGH */
|
||
|
|
||
|
case SWAPPED:
|
||
|
t = hdr->caplen;
|
||
|
hdr->caplen = hdr->len;
|
||
|
hdr->len = t;
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
if (hdr->caplen > p->bufsize) {
|
||
|
/*
|
||
|
* This can happen due to Solaris 2.3 systems tripping
|
||
|
* over the BUFMOD problem and not setting the snapshot
|
||
|
* correctly in the savefile header. If the caplen isn't
|
||
|
* grossly wrong, try to salvage.
|
||
|
*/
|
||
|
static u_char *tp = NULL;
|
||
|
static size_t tsize = 0;
|
||
|
|
||
|
if (hdr->caplen > 65535) {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"bogus savefile header");
|
||
|
return (-1);
|
||
|
}
|
||
|
|
||
|
if (tsize < hdr->caplen) {
|
||
|
tsize = ((hdr->caplen + 1023) / 1024) * 1024;
|
||
|
if (tp != NULL)
|
||
|
free((u_char *)tp);
|
||
|
tp = (u_char *)malloc(tsize);
|
||
|
if (tp == NULL) {
|
||
|
tsize = 0;
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"BUFMOD hack malloc");
|
||
|
return (-1);
|
||
|
}
|
||
|
}
|
||
|
amt_read = fread((char *)tp, 1, hdr->caplen, fp);
|
||
|
if (amt_read != hdr->caplen) {
|
||
|
if (ferror(fp)) {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"error reading dump file: %s",
|
||
|
pcap_strerror(errno));
|
||
|
} else {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"truncated dump file; tried to read %u captured bytes, only got %lu",
|
||
|
hdr->caplen, (unsigned long)amt_read);
|
||
|
}
|
||
|
return (-1);
|
||
|
}
|
||
|
/*
|
||
|
* We can only keep up to p->bufsize bytes. Since
|
||
|
* caplen > p->bufsize is exactly how we got here,
|
||
|
* we know we can only keep the first p->bufsize bytes
|
||
|
* and must drop the remainder. Adjust caplen accordingly,
|
||
|
* so we don't get confused later as to how many bytes we
|
||
|
* have to play with.
|
||
|
*/
|
||
|
hdr->caplen = p->bufsize;
|
||
|
memcpy(p->buffer, (char *)tp, p->bufsize);
|
||
|
} else {
|
||
|
/* read the packet itself */
|
||
|
amt_read = fread(p->buffer, 1, hdr->caplen, fp);
|
||
|
if (amt_read != hdr->caplen) {
|
||
|
if (ferror(fp)) {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"error reading dump file: %s",
|
||
|
pcap_strerror(errno));
|
||
|
} else {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"truncated dump file; tried to read %u captured bytes, only got %lu",
|
||
|
hdr->caplen, (unsigned long)amt_read);
|
||
|
}
|
||
|
return (-1);
|
||
|
}
|
||
|
}
|
||
|
*data = p->buffer;
|
||
|
|
||
|
if (p->sf.swapped) {
|
||
|
/*
|
||
|
* Convert pseudo-headers from the byte order of
|
||
|
* the host on which the file was saved to our
|
||
|
* byte order, as necessary.
|
||
|
*/
|
||
|
switch (p->linktype) {
|
||
|
|
||
|
case DLT_USB_LINUX:
|
||
|
swap_linux_usb_header(hdr, *data, 0);
|
||
|
break;
|
||
|
|
||
|
case DLT_USB_LINUX_MMAPPED:
|
||
|
swap_linux_usb_header(hdr, *data, 1);
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
sf_write_header(FILE *fp, int linktype, int thiszone, int snaplen)
|
||
|
{
|
||
|
struct pcap_file_header hdr;
|
||
|
|
||
|
hdr.magic = TCPDUMP_MAGIC;
|
||
|
hdr.version_major = PCAP_VERSION_MAJOR;
|
||
|
hdr.version_minor = PCAP_VERSION_MINOR;
|
||
|
|
||
|
hdr.thiszone = thiszone;
|
||
|
hdr.snaplen = snaplen;
|
||
|
hdr.sigfigs = 0;
|
||
|
hdr.linktype = linktype;
|
||
|
|
||
|
if (fwrite((char *)&hdr, sizeof(hdr), 1, fp) != 1)
|
||
|
return (-1);
|
||
|
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Output a packet to the initialized dump file.
|
||
|
*/
|
||
|
void
|
||
|
pcap_dump(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
|
||
|
{
|
||
|
register FILE *f;
|
||
|
struct pcap_sf_pkthdr sf_hdr;
|
||
|
|
||
|
f = (FILE *)user;
|
||
|
sf_hdr.ts.tv_sec = h->ts.tv_sec;
|
||
|
sf_hdr.ts.tv_usec = h->ts.tv_usec;
|
||
|
sf_hdr.caplen = h->caplen;
|
||
|
sf_hdr.len = h->len;
|
||
|
/* XXX we should check the return status */
|
||
|
(void)fwrite(&sf_hdr, sizeof(sf_hdr), 1, f);
|
||
|
(void)fwrite(sp, h->caplen, 1, f);
|
||
|
}
|
||
|
|
||
|
static pcap_dumper_t *
|
||
|
pcap_setup_dump(pcap_t *p, int linktype, FILE *f, const char *fname)
|
||
|
{
|
||
|
|
||
|
#if defined(WIN32) || defined(MSDOS)
|
||
|
/*
|
||
|
* If we're writing to the standard output, put it in binary
|
||
|
* mode, as savefiles are binary files.
|
||
|
*
|
||
|
* Otherwise, we turn off buffering.
|
||
|
* XXX - why? And why not on the standard output?
|
||
|
*/
|
||
|
if (f == stdout)
|
||
|
SET_BINMODE(f);
|
||
|
else
|
||
|
setbuf(f, NULL);
|
||
|
#endif
|
||
|
if (sf_write_header(f, linktype, p->tzoff, p->snapshot) == -1) {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Can't write to %s: %s",
|
||
|
fname, pcap_strerror(errno));
|
||
|
if (f != stdout)
|
||
|
(void)fclose(f);
|
||
|
return (NULL);
|
||
|
}
|
||
|
return ((pcap_dumper_t *)f);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Initialize so that sf_write() will output to the file named 'fname'.
|
||
|
*/
|
||
|
pcap_dumper_t *
|
||
|
pcap_dump_open(pcap_t *p, const char *fname)
|
||
|
{
|
||
|
FILE *f;
|
||
|
int linktype;
|
||
|
|
||
|
/*
|
||
|
* If this pcap_t hasn't been activated, it doesn't have a
|
||
|
* link-layer type, so we can't use it.
|
||
|
*/
|
||
|
if (!p->activated) {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"%s: not-yet-activated pcap_t passed to pcap_dump_open",
|
||
|
fname);
|
||
|
return (NULL);
|
||
|
}
|
||
|
linktype = dlt_to_linktype(p->linktype);
|
||
|
if (linktype == -1) {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"%s: link-layer type %d isn't supported in savefiles",
|
||
|
fname, p->linktype);
|
||
|
return (NULL);
|
||
|
}
|
||
|
linktype |= p->linktype_ext;
|
||
|
|
||
|
if (fname[0] == '-' && fname[1] == '\0') {
|
||
|
f = stdout;
|
||
|
fname = "standard output";
|
||
|
} else {
|
||
|
#if !defined(WIN32) && !defined(MSDOS)
|
||
|
f = fopen(fname, "w");
|
||
|
#else
|
||
|
f = fopen(fname, "wb");
|
||
|
#endif
|
||
|
if (f == NULL) {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s",
|
||
|
fname, pcap_strerror(errno));
|
||
|
return (NULL);
|
||
|
}
|
||
|
}
|
||
|
return (pcap_setup_dump(p, linktype, f, fname));
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Initialize so that sf_write() will output to the given stream.
|
||
|
*/
|
||
|
pcap_dumper_t *
|
||
|
pcap_dump_fopen(pcap_t *p, FILE *f)
|
||
|
{
|
||
|
int linktype;
|
||
|
|
||
|
linktype = dlt_to_linktype(p->linktype);
|
||
|
if (linktype == -1) {
|
||
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
||
|
"stream: link-layer type %d isn't supported in savefiles",
|
||
|
p->linktype);
|
||
|
return (NULL);
|
||
|
}
|
||
|
linktype |= p->linktype_ext;
|
||
|
|
||
|
return (pcap_setup_dump(p, linktype, f, "stream"));
|
||
|
}
|
||
|
|
||
|
FILE *
|
||
|
pcap_dump_file(pcap_dumper_t *p)
|
||
|
{
|
||
|
return ((FILE *)p);
|
||
|
}
|
||
|
|
||
|
long
|
||
|
pcap_dump_ftell(pcap_dumper_t *p)
|
||
|
{
|
||
|
return (ftell((FILE *)p));
|
||
|
}
|
||
|
|
||
|
int
|
||
|
pcap_dump_flush(pcap_dumper_t *p)
|
||
|
{
|
||
|
|
||
|
if (fflush((FILE *)p) == EOF)
|
||
|
return (-1);
|
||
|
else
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
pcap_dump_close(pcap_dumper_t *p)
|
||
|
{
|
||
|
|
||
|
#ifdef notyet
|
||
|
if (ferror((FILE *)p))
|
||
|
return-an-error;
|
||
|
/* XXX should check return from fclose() too */
|
||
|
#endif
|
||
|
(void)fclose((FILE *)p);
|
||
|
}
|