/* capture.c
* Routines for packet capture windows
*
- * $Id: capture.c,v 1.152 2001/06/15 01:36:46 guy Exp $
+ * $Id: capture.c,v 1.163 2001/12/04 08:25:55 guy Exp $
*
* Ethereal - Network traffic analyzer
- * By Gerald Combs <gerald@zing.org>
+ * By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
- *
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
#include "file.h"
#include "capture.h"
#include "util.h"
+#include "pcap-util.h"
#include "simple_dialog.h"
#include "prefs.h"
#include "globals.h"
+#include "conditions.h"
+#include "capture_stop_conditions.h"
+#include "ringbuffer.h"
#include "wiretap/libpcap.h"
#include "wiretap/wtap.h"
+#include "packet-atalk.h"
#include "packet-clip.h"
#include "packet-eth.h"
#include "packet-fddi.h"
#include "packet-tr.h"
#include "packet-ieee80211.h"
#include "packet-chdlc.h"
+#include "packet-prism.h"
+
+#ifdef WIN32
+#include "capture-wpcap.h"
+#endif
static int sync_pipe[2]; /* used to sync father */
enum PIPES { READ, WRITE }; /* Constants 0 and 1 for READ and WRITE */
* Indications sent out on the sync pipe.
*/
#define SP_CAPSTART ';' /* capture start message */
-#define SP_PACKET_COUNT '*' /* count of packets captured since last message */
-#define SP_ERROR_MSG '!' /* length of error message that follows */
-#define SP_DROPS '#' /* count of packets dropped in capture */
+#define SP_PACKET_COUNT '*' /* followed by count of packets captured since last message */
+#define SP_ERROR_MSG '!' /* followed by length of error message that follows */
+#define SP_DROPS '#' /* followed by count of packets dropped in capture */
#ifdef _WIN32
static guint cap_timer_id;
struct pcap_stat stats;
if (capfile_name != NULL) {
- /* Try to open/create the specified file for use as a capture buffer. */
- cfile.save_file_fd = open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT, 0600);
+ if (cfile.ringbuffer_on) {
+ /* ringbuffer is enabled */
+ cfile.save_file_fd = ringbuf_init(capfile_name, cfile.ringbuffer_num_files);
+ } else {
+ /* Try to open/create the specified file for use as a capture buffer. */
+ cfile.save_file_fd = open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT, 0600);
+ }
is_tempfile = FALSE;
} else {
/* Choose a random name for the capture buffer */
"The temporary file to which the capture would be saved (\"%s\")"
"could not be opened: %s.", capfile_name, strerror(errno));
} else {
+ if (cfile.ringbuffer_on) {
+ ringbuf_error_cleanup();
+ }
simple_dialog(ESD_TYPE_CRIT, NULL,
file_open_error_message(errno, TRUE), capfile_name);
}
if (prefs.capture_real_time) { /* do the capture in a child process */
char ssnap[24];
- char scount[24]; /* need a constant for len of numbers */
+ char scount[24]; /* need a constant for len of numbers */
+ char sautostop_filesize[24]; /* need a constant for len of numbers */
+ char sautostop_duration[24]; /* need a constant for len of numbers */
char save_file_fd[24];
char errmsg[1024+1];
int error;
sprintf(ssnap,"%d",cfile.snap);
argv = add_arg(argv, &argc, ssnap);
+ argv = add_arg(argv, &argc, "-a");
+ sprintf(sautostop_filesize,"filesize:%d",cfile.autostop_filesize);
+ argv = add_arg(argv, &argc, sautostop_filesize);
+
+ argv = add_arg(argv, &argc, "-a");
+ sprintf(sautostop_duration,"duration:%d",cfile.autostop_duration);
+ argv = add_arg(argv, &argc, sautostop_duration);
+
if (!prefs.capture_prom_mode)
argv = add_arg(argv, &argc, "-p");
}
/* We're not doing a capture any more, so we don't have a save
file. */
- g_free(cfile.save_file);
+ if (cfile.ringbuffer_on) {
+ ringbuf_free();
+ } else {
+ g_free(cfile.save_file);
+ }
cfile.save_file = NULL;
}
}
close(fd);
return -1;
}
- while (bytes_read < sizeof(struct pcap_hdr))
+ while ((unsigned) bytes_read < sizeof(struct pcap_hdr))
{
b = read(fd, ((char *)&hdr)+bytes_read, sizeof(struct pcap_hdr) - bytes_read);
if (b <= 0) {
ld->go = FALSE;
return 0;
}
- while (bytes_read < rechdr.hdr.incl_len)
+ while ((unsigned) bytes_read < rechdr.hdr.incl_len)
{
b = read(fd, pd+bytes_read, rechdr.hdr.incl_len - bytes_read);
if (b <= 0) {
whdr.pkt_encap = ld->linktype;
wtap_dump(ld->pdh, &whdr, NULL, pd, &err);
- /* Set the initial payload to the packet length, and the initial
- captured payload to the capture length (other protocols may
- reduce them if their headers say they're less). */
- pi.len = whdr.len;
- pi.captured_len = whdr.caplen;
-
/* update capture statistics */
switch (ld->linktype) {
case WTAP_ENCAP_ETHERNET:
- capture_eth(pd, 0, &ld->counts);
+ capture_eth(pd, 0, whdr.caplen, &ld->counts);
break;
case WTAP_ENCAP_FDDI:
case WTAP_ENCAP_FDDI_BITSWAPPED:
- capture_fddi(pd, &ld->counts);
+ capture_fddi(pd, whdr.caplen, &ld->counts);
+ break;
+ case WTAP_ENCAP_PRISM_HEADER:
+ capture_prism(pd, 0, whdr.caplen, &ld->counts);
break;
case WTAP_ENCAP_TOKEN_RING:
- capture_tr(pd, 0, &ld->counts);
+ capture_tr(pd, 0, whdr.caplen, &ld->counts);
break;
case WTAP_ENCAP_NULL:
- capture_null(pd, &ld->counts);
+ capture_null(pd, whdr.caplen, &ld->counts);
break;
case WTAP_ENCAP_PPP:
- capture_ppp_hdlc(pd, 0, &ld->counts);
+ capture_ppp_hdlc(pd, 0, whdr.caplen, &ld->counts);
break;
case WTAP_ENCAP_RAW_IP:
- capture_raw(pd, &ld->counts);
+ capture_raw(pd, whdr.caplen, &ld->counts);
break;
case WTAP_ENCAP_LINUX_ATM_CLIP:
- capture_clip(pd, &ld->counts);
+ capture_clip(pd, whdr.caplen, &ld->counts);
break;
case WTAP_ENCAP_IEEE_802_11:
- capture_ieee80211(pd, 0, &ld->counts);
+ capture_ieee80211(pd, 0, whdr.caplen, &ld->counts);
break;
case WTAP_ENCAP_CHDLC:
- capture_chdlc(pd, 0, &ld->counts);
+ capture_chdlc(pd, 0, whdr.caplen, &ld->counts);
+ break;
+ case WTAP_ENCAP_LOCALTALK:
+ capture_llap(pd, whdr.caplen, &ld->counts);
break;
/* XXX - FreeBSD may append 4-byte ATM pseudo-header to DLT_ATM_RFC1483,
with LLC header following; we should implement it at some
pcap_t *pch;
int pcap_encap;
int snaplen;
- gchar err_str[PCAP_ERRBUF_SIZE], label_str[64];
+ gchar open_err_str[PCAP_ERRBUF_SIZE];
+ gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
+ gchar label_str[64];
bpf_u_int32 netnum, netmask;
struct bpf_program fcode;
time_t upd_time, cur_time;
- int err, inpkts, i;
+ int err, inpkts;
+ condition *cnd_stop_capturesize;
+ condition *cnd_stop_timeout;
+ unsigned int i;
static const char capstart_msg = SP_CAPSTART;
char errmsg[4096+1];
+ gboolean dump_ok;
#ifndef _WIN32
static const char ppamsg[] = "can't find PPA for ";
char *libpcap_warn;
/* We haven't yet gotten the capture statistics. */
*stats_known = FALSE;
- /* Open the network interface to capture from it. */
+ /* Open the network interface to capture from it.
+ Some versions of libpcap may put warnings into the error buffer
+ if they succeed; to tell if that's happened, we have to clear
+ the error buffer, and check if it's still a null string. */
+ open_err_str[0] = '\0';
pch = pcap_open_live(cfile.iface, cfile.snap, prefs.capture_prom_mode,
- CAP_READ_TIMEOUT, err_str);
+ CAP_READ_TIMEOUT, open_err_str);
if (pch == NULL) {
#ifdef _WIN32
"\n"
"Note that the driver Ethereal uses for packet capture on Windows\n"
"doesn't support capturing on PPP/WAN interfaces in Windows NT/2000.\n",
- err_str);
+ open_err_str);
goto error;
#else
/* try to open cfile.iface as a pipe */
- pipe_fd = pipe_open_live(cfile.iface, &hdr, &ld, err_str);
+ pipe_fd = pipe_open_live(cfile.iface, &hdr, &ld, open_err_str);
if (pipe_fd == -1) {
/* Well, we couldn't start the capture.
of libpcap that properly handles HP-UX (libpcap 0.6.x and later
versions, which properly handle HP-UX, say "can't find /dev/dlpi
PPA for XXX" rather than "can't find PPA for XXX"). */
- if (strncmp(err_str, ppamsg, sizeof ppamsg - 1) == 0)
+ if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
libpcap_warn =
"\n\n"
"You are running Ethereal with a version of the libpcap library\n"
snprintf(errmsg, sizeof errmsg,
"The capture session could not be initiated (%s).\n"
"Please check to make sure you have sufficient permissions, and that\n"
- "you have the proper interface or pipe specified.%s", err_str,
+ "you have the proper interface or pipe specified.%s", open_err_str,
libpcap_warn);
goto error;
}
/* capture filters only work on real interfaces */
if (cfile.cfilter && !ld.from_pipe) {
/* A capture filter was specified; set it up. */
- if (pcap_lookupnet (cfile.iface, &netnum, &netmask, err_str) < 0) {
+ if (pcap_lookupnet(cfile.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
/*
* Well, we can't get the netmask for this interface; it's used
* only for filters that check for broadcast IP addresses, so
} else
#endif
{
- pcap_encap = pcap_datalink(pch);
+ pcap_encap = get_pcap_linktype(pch, cfile.iface);
snaplen = pcap_snapshot(pch);
}
ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
" that Ethereal doesn't support (data link type %d).", pcap_encap);
goto error;
}
- ld.pdh = wtap_dump_fdopen(cfile.save_file_fd, WTAP_FILE_PCAP,
+ if (cfile.ringbuffer_on) {
+ ld.pdh = ringbuf_init_wtap_dump_fdopen(WTAP_FILE_PCAP, ld.linktype,
+ snaplen, &err);
+ } else {
+ ld.pdh = wtap_dump_fdopen(cfile.save_file_fd, WTAP_FILE_PCAP,
ld.linktype, snaplen, &err);
+ }
if (ld.pdh == NULL) {
/* We couldn't set up to write to the capture file. */
goto error;
}
+ /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
+ returned a warning; print it, but keep capturing. */
+ if (open_err_str[0] != '\0')
+ g_warning("%s.", open_err_str);
+
/* XXX - capture SIGTERM and close the capture, in case we're on a
Linux 2.0[.x] system and you have to explicitly close the capture
stream in order to turn promiscuous mode off? We need to do that
*/
signal(SIGUSR1, stop_capture);
#endif
+ /* initialize capture stop conditions */
+ init_capture_stop_conditions();
+ /* create stop conditions */
+ cnd_stop_capturesize =
+ cnd_new(CND_CLASS_CAPTURESIZE,(long)cfile.autostop_filesize * 1000);
+ cnd_stop_timeout =
+ cnd_new(CND_CLASS_TIMEOUT,(gint32)cfile.autostop_duration);
+
while (ld.go) {
while (gtk_events_pending()) gtk_main_iteration();
}
if (inpkts > 0)
ld.sync_packets += inpkts;
+ /* check capture stop conditons */
+ if (cnd_eval(cnd_stop_timeout) == TRUE) {
+ /* The specified capture time has elapsed; stop the capture. */
+ ld.go = FALSE;
+ } else if ((cnd_eval(cnd_stop_capturesize,
+ (guint32)wtap_get_bytes_dumped(ld.pdh))) == TRUE){
+ /* Capture file reached its maximum size. */
+ if (cfile.ringbuffer_on) {
+ /* Switch to the next ringbuffer file */
+ if (ringbuf_switch_file(&cfile, &ld.pdh, &ld.err)) {
+ /* File switch succeeded: reset the condition */
+ cnd_reset(cnd_stop_capturesize);
+ } else {
+ /* File switch failed: stop here */
+ ld.go = FALSE;
+ continue;
+ }
+ } else {
+ /* no ringbuffer - just stop */
+ ld.go = FALSE;
+ }
+ }
/* Only update once a second so as not to overload slow displays */
cur_time = time(NULL);
if (cur_time > upd_time) {
}
}
+ /* delete stop conditions */
+ cnd_delete(cnd_stop_capturesize);
+ cnd_delete(cnd_stop_timeout);
+
if (ld.err != 0) {
get_capture_file_io_error(errmsg, sizeof(errmsg), cfile.save_file, ld.err,
FALSE);
/* A write failed, so we've already told the user there's a problem;
if the close fails, there's no point in telling them about that
as well. */
- wtap_dump_close(ld.pdh, &err);
- } else {
- if (!wtap_dump_close(ld.pdh, &err)) {
+ if (cfile.ringbuffer_on) {
+ ringbuf_wtap_dump_close(&cfile, &err);
+ } else {
+ wtap_dump_close(ld.pdh, &err);
+ }
+ } else {
+ if (cfile.ringbuffer_on) {
+ dump_ok = ringbuf_wtap_dump_close(&cfile, &err);
+ } else {
+ dump_ok = wtap_dump_close(ld.pdh, &err);
+ }
+ if (!dump_ok) {
get_capture_file_io_error(errmsg, sizeof(errmsg), cfile.save_file, err,
TRUE);
if (capture_child) {
return TRUE;
error:
- /* We can't use the save file, and we have no wtap_dump stream
- to close in order to close it, so close the FD directly. */
- close(cfile.save_file_fd);
-
- /* We couldn't even start the capture, so get rid of the capture
- file. */
- unlink(cfile.save_file); /* silently ignore error */
- g_free(cfile.save_file);
+ if (cfile.ringbuffer_on) {
+ /* cleanup ringbuffer */
+ ringbuf_error_cleanup();
+ } else {
+ /* We can't use the save file, and we have no wtap_dump stream
+ to close in order to close it, so close the FD directly. */
+ close(cfile.save_file_fd);
+
+ /* We couldn't even start the capture, so get rid of the capture
+ file. */
+ unlink(cfile.save_file); /* silently ignore error */
+ g_free(cfile.save_file);
+ }
cfile.save_file = NULL;
if (capture_child) {
/* This is the child process for a sync mode capture.
}
}
- /* Set the initial payload to the packet length, and the initial
- captured payload to the capture length (other protocols may
- reduce them if their headers say they're less). */
- pi.len = phdr->len;
- pi.captured_len = phdr->caplen;
-
switch (ld->linktype) {
case WTAP_ENCAP_ETHERNET:
- capture_eth(pd, 0, &ld->counts);
+ capture_eth(pd, 0, phdr->len, &ld->counts);
break;
case WTAP_ENCAP_FDDI:
case WTAP_ENCAP_FDDI_BITSWAPPED:
- capture_fddi(pd, &ld->counts);
+ capture_fddi(pd, phdr->len, &ld->counts);
+ break;
+ case WTAP_ENCAP_PRISM_HEADER:
+ capture_prism(pd, 0, phdr->len, &ld->counts);
break;
case WTAP_ENCAP_TOKEN_RING:
- capture_tr(pd, 0, &ld->counts);
+ capture_tr(pd, 0, phdr->len, &ld->counts);
break;
case WTAP_ENCAP_NULL:
- capture_null(pd, &ld->counts);
+ capture_null(pd, phdr->len, &ld->counts);
break;
case WTAP_ENCAP_PPP:
- capture_ppp_hdlc(pd, 0, &ld->counts);
+ capture_ppp_hdlc(pd, 0, phdr->len, &ld->counts);
break;
case WTAP_ENCAP_RAW_IP:
- capture_raw(pd, &ld->counts);
+ capture_raw(pd, phdr->len, &ld->counts);
break;
case WTAP_ENCAP_SLL:
- capture_sll(pd, &ld->counts);
+ capture_sll(pd, phdr->len, &ld->counts);
break;
case WTAP_ENCAP_LINUX_ATM_CLIP:
- capture_clip(pd, &ld->counts);
+ capture_clip(pd, phdr->len, &ld->counts);
+ break;
+ case WTAP_ENCAP_LOCALTALK:
+ capture_llap(pd, phdr->len, &ld->counts);
break;
/* XXX - FreeBSD may append 4-byte ATM pseudo-header to DLT_ATM_RFC1483,
with LLC header following; we should implement it at some
git.samba.org / obnox / wireshark / wip.git / blobdiff