*
* $Id$
*
- * Ethereal - Network traffic analyzer
- * By Gerald Combs <gerald@ethereal.com>
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
/** @file
- *
+ *
* Capture loop (internal interface).
*
- * It will open the input and output files, capture the packets,
+ * It will open the input and output files, capture the packets,
* change ringbuffer output files while capturing and close all files again.
- *
+ *
* The input file can be a network interface or capture pipe (unix only).
* The output file can be a single or a ringbuffer file handled by wiretap.
*
#include <signal.h>
#include <errno.h>
+#include <setjmp.h>
-#include <pcap.h>
#include <glib.h>
-#include <epan/packet.h>
+#include <pcap.h>
+
+#include "pcapio.h"
+
+#include "capture-pcap-util.h"
+
#include "capture.h"
#include "capture_sync.h"
-#include "pcap-util.h"
-#include "simple_dialog.h"
#include "conditions.h"
#include "capture_stop_conditions.h"
#include "ringbuffer.h"
-#include "wiretap/libpcap.h"
-#include "wiretap/wtap.h"
-#include "wiretap/wtap-capture.h"
-
-#include <epan/prefs.h>
-/* XXX - try to remove this later */
-#include "ui_util.h"
-/* XXX - try to remove this later */
-
-
-#include <epan/dissectors/packet-ap1394.h>
-#include <epan/dissectors/packet-atalk.h>
-#include <epan/dissectors/packet-atm.h>
-#include <epan/dissectors/packet-clip.h>
-#include <epan/dissectors/packet-eth.h>
-#include <epan/dissectors/packet-fddi.h>
-#include <epan/dissectors/packet-fr.h>
-#include <epan/dissectors/packet-null.h>
-#include <epan/dissectors/packet-ppp.h>
-#include <epan/dissectors/packet-raw.h>
-#include <epan/dissectors/packet-sll.h>
-#include <epan/dissectors/packet-tr.h>
-#include <epan/dissectors/packet-ieee80211.h>
-#include <epan/dissectors/packet-chdlc.h>
-#include <epan/dissectors/packet-prism.h>
-#include <epan/dissectors/packet-ipfc.h>
-#include <epan/dissectors/packet-arcnet.h>
-
+#include "simple_dialog.h"
+#include "tempfile.h"
+#include "log.h"
+#include "file_util.h"
+#include "epan/unicode-utils.h"
+#include "capture_loop.h"
/*
- * We don't want to do a "select()" on the pcap_t's file descriptor on
- * BSD (because "select()" doesn't work correctly on BPF devices on at
- * least some releases of some flavors of BSD), and we don't want to do
- * it on Windows (because "select()" is something for sockets, not for
- * arbitrary handles). (Note that "Windows" here includes Cygwin;
- * even in its pretend-it's-UNIX environment, we're using WinPcap, not
- * a UNIX libpcap.)
- *
- * We *do* want to do it on other platforms, as, on other platforms (with
- * the possible exception of Ultrix and Digital UNIX), the read timeout
- * doesn't expire if no packets have arrived, so a "pcap_dispatch()" call
- * will block until packets arrive, causing the UI to hang.
- *
- * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
- * want to include it if it's not present on this platform, however.
+ * Standard secondary message for unexpected errors.
*/
-#if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
- !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
- !defined(__CYGWIN__)
-# define MUST_DO_SELECT
-#endif
-
-
-typedef struct _loop_data {
- /* common */
- gboolean go; /* TRUE as long as we're supposed to keep capturing */
- int err; /* if non-zero, error seen while capturing */
- gint packets_max; /* Number of packets we're supposed to capture - 0 means infinite */
- gint packets_sync_pipe; /* packets not already send out to the sync_pipe */
- packet_counts counts; /* several packet type counters */
+static const char please_report[] =
+ "Please report this to the Wireshark developers. (This is not a crash;\n"
+ "please do not report it as such.)";
- /* pcap "input file" */
- pcap_t *pcap_h; /* pcap handle */
- gboolean pcap_err; /* TRUE if error from pcap */
-#ifdef MUST_DO_SELECT
- int pcap_fd; /* pcap file descriptor */
-#endif
-
- /* capture pipe (unix only "input file") */
- gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
-#ifndef _WIN32
- struct pcap_hdr cap_pipe_hdr;
- int cap_pipe_fd; /* the file descriptor of the capture pipe */
- gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
- gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
- unsigned int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
- unsigned int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
- enum {
- STATE_EXPECT_REC_HDR,
- STATE_READ_REC_HDR,
- STATE_EXPECT_DATA,
- STATE_READ_DATA
- } cap_pipe_state;
-
- enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
-#endif
-
- /* wiretap (output file) */
- wtap_dumper *wtap_pdh;
- gint wtap_linktype;
-
-} loop_data;
+/*
+ * This needs to be static, so that the SIGUSR1 handler can clear the "go"
+ * flag.
+ */
+static loop_data ld;
/*
* Timeout, in milliseconds, for reads from the stream of captured packets.
*/
#define CAP_READ_TIMEOUT 250
+static char *cap_pipe_err_str;
-static void capture_loop_packet_cb(guchar *user, const struct pcap_pkthdr *phdr,
- const guchar *pd);
-static void capture_loop_popup_errmsg(capture_options *capture_opts, const char *errmsg);
+static void capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
+ const u_char *pd);
static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
int err, gboolean is_close);
-#ifndef _WIN32
/* Take care of byte order in the libpcap headers read from pipes.
* (function taken from wiretap/libpcap.c) */
static void
-cap_pipe_adjust_header(loop_data *ld, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
+cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
{
- if (ld->cap_pipe_byte_swapped) {
+ if (byte_swapped) {
/* Byte-swap the record header fields. */
rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
}
}
+/* Provide select() functionality for a single file descriptor
+ * on both UNIX/POSIX and Windows.
+ *
+ * The Windows version calls WaitForSingleObject instead of
+ * select().
+ *
+ * Returns the same values as select. If an error is returned,
+ * the string cap_pipe_err_str should be used instead of errno.
+ */
+static int
+cap_pipe_select(int pipe_fd, gboolean wait_forever) {
+#ifndef _WIN32
+ fd_set rfds;
+ struct timeval timeout, *pto;
+ int sel_ret;
+
+ cap_pipe_err_str = "Unknown error";
+
+ FD_ZERO(&rfds);
+ FD_SET(pipe_fd, &rfds);
+ if (wait_forever) {
+ pto = NULL;
+ } else {
+ timeout.tv_sec = 0;
+ timeout.tv_usec = CAP_READ_TIMEOUT * 1000;
+ pto = &timeout;
+ }
+ sel_ret = select(pipe_fd+1, &rfds, NULL, NULL, pto);
+ if (sel_ret < 0)
+ cap_pipe_err_str = strerror(errno);
+ return sel_ret;
+}
+#else
+ /* XXX - Should we just use file handles exclusively under Windows?
+ * Otherwise we have to convert between file handles and file descriptors
+ * here and when we open a named pipe.
+ */
+ HANDLE hPipe = (HANDLE) _get_osfhandle(pipe_fd);
+ wchar_t *err_str;
+ DWORD timeout = wait_forever ? INFINITE : CAP_READ_TIMEOUT * 1000;
+ DWORD wait_ret;
+
+ if (hPipe == INVALID_HANDLE_VALUE) {
+ cap_pipe_err_str = "Could not open standard input";
+ return -1;
+ }
+
+ cap_pipe_err_str = "Unknown error";
+
+ wait_ret = WaitForSingleObject(hPipe, timeout);
+ switch (wait_ret) {
+ /* XXX - This probably isn't correct */
+ case WAIT_ABANDONED:
+ errno = EINTR;
+ return -1;
+ case WAIT_OBJECT_0:
+ return 1;
+ case WAIT_TIMEOUT:
+ return 0;
+ case WAIT_FAILED:
+ FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
+ NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
+ cap_pipe_err_str = utf_16to8(err_str);
+ LocalFree(err_str);
+ return -1;
+ default:
+ g_assert_not_reached();
+ return -1;
+ }
+}
+#endif
+
+
/* Mimic pcap_open_live() for pipe captures
* We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
* header.
cap_pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ld,
char *errmsg, int errmsgl)
{
+#ifndef _WIN32
struct stat pipe_stat;
- int fd;
- guint32 magic;
- int b, sel_ret;
+#else
+#if 0
+ char *pncopy, *pos;
+ wchar_t *err_str;
+#endif
+ HANDLE hPipe = NULL;
+#endif
+ int sel_ret;
+ int fd;
+ int b;
+ guint32 magic;
unsigned int bytes_read;
- fd_set rfds;
- struct timeval timeout;
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
+
/*
- * XXX Ethereal blocks until we return
+ * XXX (T)Wireshark blocks until we return
*/
- if (strcmp(pipename, "-") == 0)
+ if (strcmp(pipename, "-") == 0) {
fd = 0; /* read from stdin */
- else {
- if (stat(pipename, &pipe_stat) < 0) {
+#ifdef _WIN32
+ /*
+ * This is needed to set the stdin pipe into binary mode, otherwise
+ * CR/LF are mangled...
+ */
+ _setmode(0, _O_BINARY);
+#endif /* _WIN32 */
+ } else {
+#ifndef _WIN32
+ if (eth_stat(pipename, &pipe_stat) < 0) {
if (errno == ENOENT || errno == ENOTDIR)
ld->cap_pipe_err = PIPNEXIST;
else {
* interfaces are in /dev. Pretend we haven't seen it.
*/
ld->cap_pipe_err = PIPNEXIST;
- } else {
+ } else
+ {
g_snprintf(errmsg, errmsgl,
"The capture session could not be initiated because\n"
"\"%s\" is neither an interface nor a pipe", pipename);
}
return -1;
}
- fd = open(pipename, O_RDONLY | O_NONBLOCK);
+ fd = eth_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
+ if (fd == -1) {
+ g_snprintf(errmsg, errmsgl,
+ "The capture session could not be initiated "
+ "due to error on pipe open: %s", strerror(errno));
+ ld->cap_pipe_err = PIPERR;
+ return -1;
+ }
+#else /* _WIN32 */
+#if 0 /* Enable/disable Windows named pipes */
+#define PIPE_STR "\\pipe\\"
+ /* Under Windows, named pipes _must_ have the form
+ * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
+ */
+ pncopy = g_strdup(pipename);
+ if (strstr(pncopy, "\\\\") == pncopy) {
+ pos = strchr(pncopy + 3, '\\');
+ if (pos && g_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
+ pos = NULL;
+ }
+
+ g_free(pncopy);
+
+ if (!pos) {
+ g_snprintf(errmsg, errmsgl,
+ "The capture session could not be initiated because\n"
+ "\"%s\" is neither an interface nor a pipe", pipename);
+ ld->cap_pipe_err = PIPNEXIST;
+ return -1;
+ }
+
+ /* Wait for the pipe to appear */
+ while (1) {
+ hPipe = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
+ OPEN_EXISTING, 0, NULL);
+
+ if (hPipe != INVALID_HANDLE_VALUE)
+ break;
+
+ if (GetLastError() != ERROR_PIPE_BUSY) {
+ FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
+ NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
+ g_snprintf(errmsg, errmsgl,
+ "The capture session on \"%s\" could not be initiated "
+ "due to error on pipe open: pipe busy: %s (error %d)",
+ pipename, utf_16to8(err_str), GetLastError());
+ LocalFree(err_str);
+ ld->cap_pipe_err = PIPERR;
+ return -1;
+ }
+
+ if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
+ FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
+ NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
+ g_snprintf(errmsg, errmsgl,
+ "The capture session could not be initiated "
+ "due to error on pipe open: %s (error %d)",
+ utf_16to8(err_str), GetLastError());
+ LocalFree(err_str);
+ ld->cap_pipe_err = PIPERR;
+ return -1;
+ }
+ }
+
+ fd = _open_osfhandle((long) hPipe, _O_RDONLY);
if (fd == -1) {
g_snprintf(errmsg, errmsgl,
"The capture session could not be initiated "
ld->cap_pipe_err = PIPERR;
return -1;
}
+#else /* Enable/disable Windows named pipes */
+ /* On Windows, we don't support capturing on pipes, so we give up. */
+
+ g_snprintf(errmsg, errmsgl,
+"The capture session could not be initiated. Unable to open interface.");
+ return -1;
+#endif /* Enable/disable Windows named pipes */
+#endif /* _WIN32 */
}
ld->from_cap_pipe = TRUE;
/* read the pcap header */
- FD_ZERO(&rfds);
bytes_read = 0;
while (bytes_read < sizeof magic) {
- FD_SET(fd, &rfds);
- timeout.tv_sec = 0;
- timeout.tv_usec = CAP_READ_TIMEOUT*1000;
- sel_ret = select(fd+1, &rfds, NULL, NULL, &timeout);
+ sel_ret = cap_pipe_select(fd, FALSE);
if (sel_ret < 0) {
g_snprintf(errmsg, errmsgl,
"Unexpected error from select: %s", strerror(errno));
/* Read the rest of the header */
bytes_read = 0;
while (bytes_read < sizeof(struct pcap_hdr)) {
- FD_SET(fd, &rfds);
- timeout.tv_sec = 0;
- timeout.tv_usec = CAP_READ_TIMEOUT*1000;
- sel_ret = select(fd+1, &rfds, NULL, NULL, &timeout);
+ sel_ret = cap_pipe_select(fd, FALSE);
if (sel_ret < 0) {
g_snprintf(errmsg, errmsgl,
"Unexpected error from select: %s", strerror(errno));
hdr->snaplen = BSWAP32(hdr->snaplen);
hdr->network = BSWAP32(hdr->network);
}
+ ld->linktype = hdr->network;
if (hdr->version_major < 2) {
g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
return fd;
error:
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
ld->cap_pipe_err = PIPERR;
- close(fd);
+ eth_close(fd);
return -1;
}
/* We read one record from the pipe, take care of byte order in the record
* header, write the record to the capture file, and update capture statistics. */
static int
-cap_pipe_dispatch(int fd, loop_data *ld, struct pcap_hdr *hdr,
- struct pcaprec_modified_hdr *rechdr, guchar *data,
- char *errmsg, int errmsgl)
+cap_pipe_dispatch(loop_data *ld, guchar *data, char *errmsg, int errmsgl)
{
struct pcap_pkthdr phdr;
int b;
enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
PD_ERR } result;
+
+#ifdef LOG_CAPTURE_VERBOSE
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
+#endif
+
switch (ld->cap_pipe_state) {
case STATE_EXPECT_REC_HDR:
/* Fall through */
case STATE_READ_REC_HDR:
- b = read(fd, ((char *)rechdr)+ld->cap_pipe_bytes_read,
- ld->cap_pipe_bytes_to_read - ld->cap_pipe_bytes_read);
+ b = read(ld->cap_pipe_fd, ((char *)&ld->cap_pipe_rechdr)+ld->cap_pipe_bytes_read,
+ ld->cap_pipe_bytes_to_read - ld->cap_pipe_bytes_read);
if (b <= 0) {
if (b == 0)
result = PD_PIPE_EOF;
/* Fall through */
case STATE_READ_DATA:
- b = read(fd, data+ld->cap_pipe_bytes_read, rechdr->hdr.incl_len - ld->cap_pipe_bytes_read);
+ b = read(ld->cap_pipe_fd, data+ld->cap_pipe_bytes_read,
+ ld->cap_pipe_rechdr.hdr.incl_len - ld->cap_pipe_bytes_read);
if (b <= 0) {
if (b == 0)
result = PD_PIPE_EOF;
result = PD_PIPE_ERR;
break;
}
- if ((ld->cap_pipe_bytes_read += b) < rechdr->hdr.incl_len)
+ if ((ld->cap_pipe_bytes_read += b) < ld->cap_pipe_rechdr.hdr.incl_len)
return 0;
result = PD_DATA_READ;
break;
case PD_REC_HDR_READ:
/* We've read the header. Take care of byte order. */
- cap_pipe_adjust_header(ld, hdr, &rechdr->hdr);
- if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
+ cap_pipe_adjust_header(ld->cap_pipe_byte_swapped, &ld->cap_pipe_hdr,
+ &ld->cap_pipe_rechdr.hdr);
+ if (ld->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
- ld->counts.total+1, rechdr->hdr.incl_len);
+ ld->packet_count+1, ld->cap_pipe_rechdr.hdr.incl_len);
break;
}
ld->cap_pipe_state = STATE_EXPECT_DATA;
case PD_DATA_READ:
/* Fill in a "struct pcap_pkthdr", and process the packet. */
- phdr.ts.tv_sec = rechdr->hdr.ts_sec;
- phdr.ts.tv_usec = rechdr->hdr.ts_usec;
- phdr.caplen = rechdr->hdr.incl_len;
- phdr.len = rechdr->hdr.orig_len;
+ phdr.ts.tv_sec = ld->cap_pipe_rechdr.hdr.ts_sec;
+ phdr.ts.tv_usec = ld->cap_pipe_rechdr.hdr.ts_usec;
+ phdr.caplen = ld->cap_pipe_rechdr.hdr.incl_len;
+ phdr.len = ld->cap_pipe_rechdr.hdr.orig_len;
- capture_loop_packet_cb((guchar *)ld, &phdr, data);
+ ld->packet_cb((u_char *)ld, &phdr, data);
ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
return 1;
/* Return here rather than inside the switch to prevent GCC warning */
return -1;
}
-#endif /* not _WIN32 */
/* open the capture input file (pcap or capture pipe) */
-static int capture_loop_open_input(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len) {
+gboolean
+capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
+ char *errmsg, size_t errmsg_len,
+ char *secondary_errmsg, size_t secondary_errmsg_len)
+{
gchar open_err_str[PCAP_ERRBUF_SIZE];
+ gchar *sync_msg_str;
+ static const char ppamsg[] = "can't find PPA for ";
const char *set_linktype_err_str;
+ const char *libpcap_warn;
#ifdef _WIN32
+ gchar *sync_secondary_msg_str;
int err;
WORD wVersionRequested;
WSADATA wsaData;
-#else
- static const char ppamsg[] = "can't find PPA for ";
- char *libpcap_warn;
#endif
+
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", capture_opts->iface);
+
+
+/* XXX - opening Winsock on tshark? */
+
/* Initialize Windows Socket if we are in a WIN32 OS
This needs to be done before querying the interface for network/netmask */
#ifdef _WIN32
"Couldn't initialize Windows Sockets: error %d", err);
break;
}
+ g_snprintf(secondary_errmsg, secondary_errmsg_len, please_report);
return FALSE;
}
#endif
#ifdef _WIN32
/* try to set the capture buffer size */
if (pcap_setbuff(ld->pcap_h, capture_opts->buffer_size * 1024 * 1024) != 0) {
- simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
- "%sCouldn't set the capture buffer size!%s\n"
- "\n"
+ sync_secondary_msg_str = g_strdup_printf(
"The capture buffer size of %luMB seems to be too high for your machine,\n"
"the default of 1MB will be used.\n"
"\n"
"Nonetheless, the capture is started.\n",
- simple_dialog_primary_start(), simple_dialog_primary_end(), capture_opts->buffer_size);
+ capture_opts->buffer_size);
+ report_capture_error("Couldn't set the capture buffer size!",
+ sync_secondary_msg_str);
+ g_free(sync_secondary_msg_str);
}
#endif
capture_opts->linktype);
if (set_linktype_err_str != NULL) {
g_snprintf(errmsg, errmsg_len, "Unable to set data link type (%s).",
- set_linktype_err_str);
+ set_linktype_err_str);
+ g_snprintf(secondary_errmsg, secondary_errmsg_len, please_report);
return FALSE;
}
}
+ ld->linktype = get_pcap_linktype(ld->pcap_h, capture_opts->iface);
} else {
/* We couldn't open "iface" as a network device. */
-#ifdef _WIN32
- /* On Windows, we don't support capturing on pipes, so we give up.
- If this is a child process that does the capturing in sync
- mode or fork mode, it shouldn't do any UI stuff until we pop up the
- capture-progress window, and, since we couldn't start the
- capture, we haven't popped it up. */
- if (!capture_opts->capture_child) {
- main_window_update();
- }
-
- /* On Win32 OSes, the capture devices are probably available to all
- users; don't warn about permissions problems.
-
- Do, however, warn that WAN devices aren't supported. */
- g_snprintf(errmsg, errmsg_len,
-"The capture session could not be initiated (%s).\n"
-"Please check that you have the proper interface specified.\n"
-"\n"
-"Note that version 3.0 of WinPcap, and earlier versions of WinPcap, don't\n"
-"support capturing on PPP/WAN interfaces in Windows NT 4.0, Windows 2000,\n"
-"Windows XP, or Windows Server 2003. WinPcap 3.1 has experimental support\n"
-"for it on Windows 2000, Windows XP, and Windows Server 2003, but has no\n"
-"support for it on Windows NT 4.0. WinPcap 3.1 is currently in beta, so\n"
-"using it might introduce bugs not present in WinPcap 3.0; you should report\n"
-"all problems you see to the WinPcap developers, so they can try to fix\n"
-"them before the final WinPcap 3.1 release.",
- open_err_str);
- return FALSE;
-#else
- /* try to open iface as a pipe */
+ /* Try to open it as a pipe */
ld->cap_pipe_fd = cap_pipe_open_live(capture_opts->iface, &ld->cap_pipe_hdr, ld, errmsg, errmsg_len);
if (ld->cap_pipe_fd == -1) {
- /* If this is a child process that does the capturing in sync
- * mode or fork mode, it shouldn't do any UI stuff until we pop up the
- * capture-progress window, and, since we couldn't start the
- * capture, we haven't popped it up.
- */
- if (!capture_opts->capture_child) {
- main_window_update();
- }
-
if (ld->cap_pipe_err == PIPNEXIST) {
/* Pipe doesn't exist, so output message for interface */
- /* If we got a "can't find PPA for XXX" message, warn the user (who
- is running Ethereal on HP-UX) that they don't have a version
+ /* If we got a "can't find PPA for X" message, warn the user (who
+ is running (T)Wireshark on HP-UX) that they don't have a version
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"). */
+ PPA for X" rather than "can't find PPA for X"). */
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"
+ "You are running (T)Wireshark with a version of the libpcap library\n"
"that doesn't handle HP-UX network devices well; this means that\n"
- "Ethereal may not be able to capture packets.\n"
+ "(T)Wireshark may not be able to capture packets.\n"
"\n"
"To fix this, you should install libpcap 0.6.2, or a later version\n"
"of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
else
libpcap_warn = "";
g_snprintf(errmsg, errmsg_len,
- "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", open_err_str,
- libpcap_warn);
+ "The capture session could not be initiated (%s).", open_err_str);
+#ifndef _WIN32
+ g_snprintf(secondary_errmsg, secondary_errmsg_len,
+"Please check to make sure you have sufficient permissions, and that you have\n"
+"the proper interface or pipe specified.%s", libpcap_warn);
+#else
+ g_snprintf(secondary_errmsg, secondary_errmsg_len,
+"\n"
+"Please check that \"%s\" is the proper interface.\n"
+"\n"
+"\n"
+"Help can be found at:\n"
+"\n"
+" http://wiki.wireshark.org/CaptureSetup\n"
+"\n"
+"64-bit Windows:\n"
+"WinPcap does not support 64-bit Windows; you will have to use some other\n"
+"tool to capture traffic, such as netcap.\n"
+"For netcap details see: http://support.microsoft.com/?id=310875\n"
+"\n"
+"Modem (PPP/WAN):\n"
+"Note that version 3.0 of WinPcap, and earlier versions of WinPcap, don't\n"
+"support capturing on PPP/WAN interfaces on Windows NT 4.0 / 2000 / XP /\n"
+"Server 2003.\n"
+"WinPcap 3.1 has support for it on Windows 2000 / XP / Server 2003, but has no\n"
+"support for it on Windows NT 4.0 or Windows Vista (Beta 1).",
+ capture_opts->iface);
+#endif /* _WIN32 */
}
/*
* Else pipe (or file) does exist and cap_pipe_open_live() has
/* cap_pipe_open_live() succeeded; don't want
error message from pcap_open_live() */
open_err_str[0] = '\0';
-#endif
}
+/* XXX - will this work for tshark? */
#ifdef MUST_DO_SELECT
- if (!ld->from_cap_pipe) ld->pcap_fd = pcap_fileno(ld->pcap_h);
+ if (!ld->from_cap_pipe) {
+#ifdef HAVE_PCAP_GET_SELECTABLE_FD
+ ld->pcap_fd = pcap_get_selectable_fd(ld->pcap_h);
+#else
+ ld->pcap_fd = pcap_fileno(ld->pcap_h);
+#endif
+ }
#endif
/* 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);
+ if (open_err_str[0] != '\0') {
+ sync_msg_str = g_strdup_printf("%s.", open_err_str);
+ report_capture_error(sync_msg_str, "");
+ g_free(sync_msg_str);
+ }
return TRUE;
}
-/* open the capture input file (pcap or capture pipe) */
+/* close the capture input file (pcap or capture pipe) */
static void capture_loop_close_input(loop_data *ld) {
-#ifndef _WIN32
+
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
+
/* if open, close the capture pipe "input file" */
if (ld->cap_pipe_fd >= 0) {
g_assert(ld->from_cap_pipe);
- close(ld->cap_pipe_fd);
+ eth_close(ld->cap_pipe_fd);
+ ld->cap_pipe_fd = 0;
}
-#endif
/* if open, close the pcap "input file" */
if(ld->pcap_h != NULL) {
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", ld->pcap_h);
g_assert(!ld->from_cap_pipe);
pcap_close(ld->pcap_h);
+ ld->pcap_h = NULL;
}
+ ld->go = FALSE;
+
#ifdef _WIN32
/* Shut down windows sockets */
WSACleanup();
/* init the capture filter */
-static int capture_loop_init_filter(loop_data *ld, const gchar * iface, gchar * cfilter, char *errmsg, int errmsg_len) {
+initfilter_status_t capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe, const gchar * iface, gchar * cfilter) {
bpf_u_int32 netnum, netmask;
gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
struct bpf_program fcode;
+
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
+
/* capture filters only work on real interfaces */
- if (cfilter && !ld->from_cap_pipe) {
+ if (cfilter && !from_cap_pipe) {
/* A capture filter was specified; set it up. */
if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
/*
* a difference (only filters that check for IP broadcast addresses
* use the netmask).
*/
+ /*cmdarg_err(
+ "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
netmask = 0;
}
- if (pcap_compile(ld->pcap_h, &fcode, cfilter, 1, netmask) < 0) {
- dfilter_t *rfcode = NULL;
- /* filter string invalid, did the user tried a display filter? */
- if (dfilter_compile(cfilter, &rfcode) && rfcode != NULL) {
- g_snprintf(errmsg, errmsg_len,
- "%sInvalid capture filter: \"%s\"!%s\n"
- "\n"
- "That string looks like a valid display filter; however, it isn't a valid\n"
- "capture filter (%s).\n"
- "\n"
- "Note that display filters and capture filters don't have the same syntax,\n"
- "so you can't use most display filter expressions as capture filters.\n"
- "\n"
- "See the help for a description of the capture filter syntax.",
- simple_dialog_primary_start(), cfilter, simple_dialog_primary_end(),
- pcap_geterr(ld->pcap_h));
- dfilter_free(rfcode);
- } else {
- g_snprintf(errmsg, errmsg_len,
- "%sInvalid capture filter: \"%s\"!%s\n"
- "\n"
- "That string isn't a valid capture filter (%s).\n"
- "See the help for a description of the capture filter syntax.",
- simple_dialog_primary_start(), cfilter, simple_dialog_primary_end(),
- pcap_geterr(ld->pcap_h));
- }
- return FALSE;
+ if (pcap_compile(pcap_h, &fcode, cfilter, 1, netmask) < 0) {
+ /* Treat this specially - our caller might try to compile this
+ as a display filter and, if that succeeds, warn the user that
+ the display and capture filter syntaxes are different. */
+ return INITFILTER_BAD_FILTER;
}
- if (pcap_setfilter(ld->pcap_h, &fcode) < 0) {
- g_snprintf(errmsg, errmsg_len, "Can't install filter (%s).",
- pcap_geterr(ld->pcap_h));
+ if (pcap_setfilter(pcap_h, &fcode) < 0) {
#ifdef HAVE_PCAP_FREECODE
pcap_freecode(&fcode);
#endif
- return FALSE;
+ return INITFILTER_OTHER_ERROR;
}
#ifdef HAVE_PCAP_FREECODE
pcap_freecode(&fcode);
#endif
}
- return TRUE;
+ return INITFILTER_NO_ERROR;
}
-/* open the wiretap part of the capture output file */
-static int capture_loop_open_wiretap_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len) {
- int pcap_encap;
+/* set up to write to the already-opened capture output file/files */
+gboolean capture_loop_init_output(capture_options *capture_opts, int save_file_fd, loop_data *ld, char *errmsg, int errmsg_len) {
int file_snaplen;
int err;
- /* get packet encapsulation type and snaplen */
-#ifndef _WIN32
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
+
+ /* get snaplen */
if (ld->from_cap_pipe) {
- pcap_encap = ld->cap_pipe_hdr.network;
file_snaplen = ld->cap_pipe_hdr.snaplen;
} else
-#endif
{
- pcap_encap = get_pcap_linktype(ld->pcap_h, capture_opts->iface);
file_snaplen = pcap_snapshot(ld->pcap_h);
}
/* Set up to write to the capture file. */
- ld->wtap_linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
- if (ld->wtap_linktype == WTAP_ENCAP_UNKNOWN) {
- g_snprintf(errmsg, errmsg_len,
- "The network you're capturing from is of a type"
- " that Ethereal doesn't support (data link type %d).", pcap_encap);
- return FALSE;
- }
if (capture_opts->multi_files_on) {
- ld->wtap_pdh = ringbuf_init_wtap_dump_fdopen(WTAP_FILE_PCAP, ld->wtap_linktype,
- file_snaplen, &err);
+ ld->pdh = ringbuf_init_libpcap_fdopen(ld->linktype, file_snaplen,
+ &ld->bytes_written, &err);
} else {
- ld->wtap_pdh = wtap_dump_fdopen(capture_opts->save_file_fd, WTAP_FILE_PCAP,
- ld->wtap_linktype, file_snaplen, &err);
+ ld->pdh = libpcap_fdopen(save_file_fd, ld->linktype, file_snaplen,
+ &ld->bytes_written, &err);
}
- if (ld->wtap_pdh == NULL) {
+ if (ld->pdh == NULL) {
/* We couldn't set up to write to the capture file. */
+ /* XXX - use cf_open_error_message from tshark instead? */
switch (err) {
case WTAP_ERR_CANT_OPEN:
return TRUE;
}
-static gboolean capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close) {
+gboolean capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close) {
+
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
+
if (capture_opts->multi_files_on) {
- return ringbuf_wtap_dump_close(&capture_opts->save_file, err_close);
+ return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
} else {
- return wtap_dump_close(ld->wtap_pdh, err_close);
+ return libpcap_dump_close(ld->pdh, err_close);
}
}
/* dispatch incoming packets (pcap or capture pipe) */
-static int
-capture_loop_dispatch(capture_options *capture_opts, loop_data *ld,
+int
+capture_loop_dispatch(capture_options *capture_opts _U_, loop_data *ld,
char *errmsg, int errmsg_len) {
int inpkts;
-#ifndef _WIN32
- fd_set set1;
- struct timeval timeout;
int sel_ret;
- struct pcaprec_modified_hdr rechdr;
guchar pcap_data[WTAP_MAX_PACKET_SIZE];
-#endif
-#ifndef _WIN32
+ if (ld->from_cap_pipe) {
/* dispatch from capture pipe */
- if (ld->from_cap_pipe) {
- FD_ZERO(&set1);
- FD_SET(ld->cap_pipe_fd, &set1);
- timeout.tv_sec = 0;
- timeout.tv_usec = CAP_READ_TIMEOUT*1000;
- sel_ret = select(ld->cap_pipe_fd+1, &set1, NULL, NULL, &timeout);
- if (sel_ret <= 0) {
- inpkts = 0;
+#ifdef LOG_CAPTURE_VERBOSE
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
+#endif
+ sel_ret = cap_pipe_select(ld->cap_pipe_fd, FALSE);
+ if (sel_ret <= 0) {
+ inpkts = 0;
+ if (sel_ret < 0 && errno != EINTR) {
+ g_snprintf(errmsg, errmsg_len,
+ "Unexpected error from select: %s", strerror(errno));
+ report_capture_error(errmsg, please_report);
+ ld->go = FALSE;
+ }
+ } else {
+ /*
+ * "select()" says we can read from the pipe without blocking
+ */
+ inpkts = cap_pipe_dispatch(ld, pcap_data, errmsg, errmsg_len);
+ if (inpkts < 0) {
+ ld->go = FALSE;
+ }
+ }
+ }
+ else
+ {
+ /* dispatch from pcap */
+#ifdef MUST_DO_SELECT
+ /*
+ * If we have "pcap_get_selectable_fd()", we use it to get the
+ * descriptor on which to select; if that's -1, it means there
+ * is no descriptor on which you can do a "select()" (perhaps
+ * because you're capturing on a special device, and that device's
+ * driver unfortunately doesn't support "select()", in which case
+ * we don't do the select - which means it might not be possible
+ * to stop a capture until a packet arrives. If that's unacceptable,
+ * plead with whoever supplies the software for that device to add
+ * "select()" support, or upgrade to libpcap 0.8.1 or later, and
+ * rebuild Wireshark or get a version built with libpcap 0.8.1 or
+ * later, so it can use pcap_breakloop().
+ */
+#ifdef LOG_CAPTURE_VERBOSE
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
+#endif
+ if (ld->pcap_fd != -1) {
+ sel_ret = cap_pipe_select(ld->pcap_fd, TRUE);
+ if (sel_ret > 0) {
+ /*
+ * "select()" says we can read from it without blocking; go for
+ * it.
+ *
+ * We don't have pcap_breakloop(), so we only process one packet
+ * per pcap_dispatch() call, to allow a signal to stop the
+ * processing immediately, rather than processing all packets
+ * in a batch before quitting.
+ */
+ inpkts = pcap_dispatch(ld->pcap_h, 1, ld->packet_cb, (u_char *)ld);
+ if (inpkts < 0) {
+ ld->pcap_err = TRUE;
+ ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
+ }
+ } else {
+ inpkts = 0;
if (sel_ret < 0 && errno != EINTR) {
g_snprintf(errmsg, errmsg_len,
"Unexpected error from select: %s", strerror(errno));
- capture_loop_popup_errmsg(capture_opts, errmsg);
+ report_capture_error(errmsg, please_report);
ld->go = FALSE;
}
- } else {
- /*
- * "select()" says we can read from the pipe without blocking
- */
- inpkts = cap_pipe_dispatch(ld->cap_pipe_fd, ld, &ld->cap_pipe_hdr, &rechdr, pcap_data,
- errmsg, errmsg_len);
- if (inpkts < 0) {
- ld->go = FALSE;
- }
}
}
else
-#endif /* _WIN32 */
+#endif /* MUST_DO_SELECT */
{
- /* dispatch from pcap using select */
-#ifdef MUST_DO_SELECT
+ /* dispatch from pcap without select */
+#if 1
+#ifdef LOG_CAPTURE_VERBOSE
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
+#endif
+#ifdef _WIN32
/*
- * Sigh. The semantics of the read timeout argument to
- * "pcap_open_live()" aren't particularly well specified by
- * the "pcap" man page - at least with the BSD BPF code, the
- * intent appears to be, at least in part, a way of cutting
- * down the number of reads done on a capture, by blocking
- * until the buffer fills or a timer expires - and the Linux
- * libpcap doesn't actually support it, so we can't use it
- * to break out of the "pcap_dispatch()" every 1/4 of a second
- * or so. Linux's libpcap is not the only libpcap that doesn't
- * support the read timeout.
- *
- * Furthermore, at least on Solaris, the bufmod STREAMS module's
- * read timeout won't go off if no data has arrived, i.e. it cannot
- * be used to guarantee that a read from a DLPI stream will return
- * within a specified amount of time regardless of whether any
- * data arrives or not.
- *
- * Thus, on all platforms other than BSD, we do a "select()" on the
- * file descriptor for the capture, with a timeout of CAP_READ_TIMEOUT
- * milliseconds, or CAP_READ_TIMEOUT*1000 microseconds.
+ * On Windows, we don't support asynchronously telling a process to
+ * stop capturing; instead, we check for an indication on a pipe
+ * after processing packets. We therefore process only one packet
+ * at a time, so that we can check the pipe after every packet.
+ */
+ inpkts = pcap_dispatch(ld->pcap_h, 1, ld->packet_cb, (u_char *) ld);
+#else
+ inpkts = pcap_dispatch(ld->pcap_h, -1, ld->packet_cb, (u_char *) ld);
+#endif
+ if (inpkts < 0) {
+ if (inpkts == -1) {
+ /* Error, rather than pcap_breakloop(). */
+ ld->pcap_err = TRUE;
+ }
+ ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
+ }
+#else /* pcap_next_ex */
+#ifdef LOG_CAPTURE_VERBOSE
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
+#endif
+ /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
+
+ /*
+ * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
+ * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
+ * This should be fixed in the WinPcap 4.0 alpha release.
*
- * "select()", on BPF devices, doesn't work as you might expect;
- * at least on some versions of some flavors of BSD, the timer
- * doesn't start until a read is done, so it won't expire if
- * only a "select()" or "poll()" is posted.
+ * For reference, an example remote interface:
+ * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
*/
- FD_ZERO(&set1);
- FD_SET(ld->pcap_fd, &set1);
- timeout.tv_sec = 0;
- timeout.tv_usec = CAP_READ_TIMEOUT*1000;
- sel_ret = select(ld->pcap_fd+1, &set1, NULL, NULL, &timeout);
- if (sel_ret > 0) {
- /*
- * "select()" says we can read from it without blocking; go for
- * it.
- */
- inpkts = pcap_dispatch(ld->pcap_h, 1, capture_loop_packet_cb, (gchar *)ld);
- if (inpkts < 0) {
- ld->pcap_err = TRUE;
- ld->go = FALSE;
- }
- } else {
+
+ /* emulate dispatch from pcap */
+ {
+ int in;
+ struct pcap_pkthdr *pkt_header;
+ u_char *pkt_data;
+
inpkts = 0;
- if (sel_ret < 0 && errno != EINTR) {
- g_snprintf(errmsg, errmsg_len,
- "Unexpected error from select: %s", strerror(errno));
- capture_loop_popup_errmsg(capture_opts, errmsg);
+ in = 0;
+ while(ld->go &&
+ (in = pcap_next_ex(ld->pcap_h, &pkt_header, &pkt_data)) == 1) {
+ ld->packet_cb( (u_char *) ld, pkt_header, pkt_data);
+ inpkts++;
+ }
+
+ if(in < 0) {
+ ld->pcap_err = TRUE;
ld->go = FALSE;
+ inpkts = in;
}
}
-#else
- /* dispatch from pcap without select */
- inpkts = pcap_dispatch(ld->pcap_h, 1, capture_loop_packet_cb, (gchar *) ld);
- if (inpkts < 0) {
- ld->pcap_err = TRUE;
- ld->go = FALSE;
+#endif /* pcap_next_ex */
+ }
+ }
+
+#ifdef LOG_CAPTURE_VERBOSE
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
+#endif
+
+ return inpkts;
+}
+
+
+/* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
+/* Returns TRUE if the file opened successfully, FALSE otherwise. */
+gboolean
+capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
+ char *errmsg, int errmsg_len) {
+
+ char tmpname[128+1];
+ gchar *capfile_name;
+ gboolean is_tempfile;
+
+
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
+ (capture_opts->save_file) ? capture_opts->save_file : "");
+
+ if (capture_opts->save_file != NULL) {
+ /* We return to the caller while the capture is in progress.
+ * Therefore we need to take a copy of save_file in
+ * case the caller destroys it after we return.
+ */
+ capfile_name = g_strdup(capture_opts->save_file);
+ if (strcmp(capfile_name, "-") == 0) {
+ /* Write to the standard output. */
+ if (capture_opts->multi_files_on) {
+ /* ringbuffer is enabled; that doesn't work with standard output */
+ g_snprintf(errmsg, errmsg_len,
+ "Ring buffer requested, but capture is being written to the standard output.");
+ g_free(capfile_name);
+ return FALSE;
+ } else {
+ *save_file_fd = 1;
+ }
+ } else {
+ if (capture_opts->multi_files_on) {
+ /* ringbuffer is enabled */
+ *save_file_fd = ringbuf_init(capfile_name,
+ (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0);
+
+ /* we need the ringbuf name */
+ if(*save_file_fd != -1) {
+ g_free(capfile_name);
+ capfile_name = g_strdup(ringbuf_current_filename());
+ }
+ } else {
+ /* Try to open/create the specified file for use as a capture buffer. */
+ *save_file_fd = open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
+ 0600);
}
-#endif /* MUST_DO_SELECT */
}
+ is_tempfile = FALSE;
+ } else {
+ /* Choose a random name for the temporary capture buffer */
+ *save_file_fd = create_tempfile(tmpname, sizeof tmpname, "ether");
+ capfile_name = g_strdup(tmpname);
+ is_tempfile = TRUE;
+ }
- return inpkts;
+ /* did we fail to open the output file? */
+ if (*save_file_fd == -1) {
+ if (is_tempfile) {
+ g_snprintf(errmsg, errmsg_len,
+ "The temporary file to which the capture would be saved (\"%s\") "
+ "could not be opened: %s.", capfile_name, strerror(errno));
+ } else {
+ if (capture_opts->multi_files_on) {
+ ringbuf_error_cleanup();
+ }
+
+ g_snprintf(errmsg, errmsg_len,
+ "The file to which the capture would be saved (\"%s\") "
+ "could not be opened: %s.", capfile_name,
+ strerror(errno));
+ }
+ g_free(capfile_name);
+ return FALSE;
+ }
+
+ if(capture_opts->save_file != NULL) {
+ g_free(capture_opts->save_file);
+ }
+ capture_opts->save_file = capfile_name;
+ /* capture_opts.save_file is "g_free"ed later, which is equivalent to
+ "g_free(capfile_name)". */
+
+ return TRUE;
}
-/*
- * This needs to be static, so that the SIGUSR1 handler can clear the "go"
- * flag.
- */
-static loop_data ld;
+static void
+capture_loop_stop_signal_handler(int signo _U_)
+{
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Signal: Stop capture");
+ capture_loop_stop();
+}
+
+#ifdef _WIN32
+#define TIME_GET() GetTickCount()
+#else
+#define TIME_GET() time(NULL)
+#endif
/* Do the low-level work of a capture.
Returns TRUE if it succeeds, FALSE otherwise. */
int
capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
{
+#ifndef _WIN32
+ struct sigaction act;
+#endif
time_t upd_time, cur_time;
time_t start_time;
- int err_close, inpkts;
+ int err_close;
+ int inpkts;
+ gint inpkts_to_sync_pipe = 0; /* packets not already send out to the sync_pipe */
condition *cnd_file_duration = NULL;
condition *cnd_autostop_files = NULL;
condition *cnd_autostop_size = NULL;
guint32 autostop_files = 0;
gboolean write_ok;
gboolean close_ok;
- capture_info capture_ui;
- char errmsg[4096+1];
-
- gboolean show_info = capture_opts->show_info || !capture_opts->sync_mode;
-
+ gboolean cfilter_error = FALSE;
+#define MSG_MAX_LENGTH 4096
+ char errmsg[MSG_MAX_LENGTH+1];
+ char secondary_errmsg[MSG_MAX_LENGTH+1];
+ int save_file_fd = -1;
/* init the loop data */
ld.go = TRUE;
+ ld.packet_count = 0;
if (capture_opts->has_autostop_packets)
- ld.packets_max = capture_opts->autostop_packets;
+ ld.packet_max = capture_opts->autostop_packets;
else
- ld.packets_max = 0; /* no limit */
+ ld.packet_max = 0; /* no limit */
ld.err = 0; /* no error seen yet */
ld.wtap_linktype = WTAP_ENCAP_UNKNOWN;
ld.pcap_err = FALSE;
ld.from_cap_pipe = FALSE;
- ld.packets_sync_pipe = 0;
- ld.counts.total = 0;
- ld.counts.sctp = 0;
- ld.counts.tcp = 0;
- ld.counts.udp = 0;
- ld.counts.icmp = 0;
- ld.counts.ospf = 0;
- ld.counts.gre = 0;
- ld.counts.ipx = 0;
- ld.counts.netbios = 0;
- ld.counts.vines = 0;
- ld.counts.other = 0;
- ld.counts.arp = 0;
- ld.wtap_pdh = NULL;
-#ifndef _WIN32
+ ld.pdh = NULL;
ld.cap_pipe_fd = -1;
-#endif
#ifdef MUST_DO_SELECT
ld.pcap_fd = 0;
#endif
+ ld.packet_cb = capture_loop_packet_cb;
+
/* We haven't yet gotten the capture statistics. */
*stats_known = FALSE;
+#ifndef _WIN32
+ /*
+ * Catch SIGUSR1, so that we exit cleanly if the parent process
+ * kills us with it due to the user selecting "Capture->Stop".
+ */
+ act.sa_handler = capture_loop_stop_signal_handler;
+ /*
+ * Arrange that system calls not get restarted, because when
+ * our signal handler returns we don't want to restart
+ * a call that was waiting for packets to arrive.
+ */
+ act.sa_flags = 0;
+ sigemptyset(&act.sa_mask);
+ sigaction(SIGUSR1, &act, NULL);
+#endif /* _WIN32 */
+
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
+ capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
/* open the "input file" from network interface or capture pipe */
- if (!capture_loop_open_input(capture_opts, &ld, errmsg, sizeof(errmsg))) {
+ if (!capture_loop_open_input(capture_opts, &ld, errmsg, sizeof(errmsg),
+ secondary_errmsg, sizeof(secondary_errmsg))) {
goto error;
}
/* init the input filter from the network interface (capture pipe will do nothing) */
- if (!capture_loop_init_filter(&ld, capture_opts->iface, capture_opts->cfilter, errmsg, sizeof(errmsg))) {
+ switch (capture_loop_init_filter(ld.pcap_h, ld.from_cap_pipe, capture_opts->iface, capture_opts->cfilter)) {
+
+ case INITFILTER_NO_ERROR:
+ break;
+
+ case INITFILTER_BAD_FILTER:
+ cfilter_error = TRUE;
+ g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(ld.pcap_h));
+ *secondary_errmsg = '\0';
goto error;
- }
- /* open the wiretap part of the output file (the output file is already open) */
- if (!capture_loop_open_wiretap_output(capture_opts, &ld, errmsg, sizeof(errmsg))) {
+ case INITFILTER_OTHER_ERROR:
+ g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
+ pcap_geterr(ld.pcap_h));
+ g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
goto error;
}
+ /* If we're supposed to write to a capture file, open it for output
+ (temporary/specified name/ringbuffer) */
+ if (capture_opts->saving_to_file) {
+ if (!capture_loop_open_output(capture_opts, &save_file_fd, errmsg, sizeof(errmsg))) {
+ *secondary_errmsg = '\0';
+ goto error;
+ }
+
+ /* set up to write to the already-opened capture output file/files */
+ if (!capture_loop_init_output(capture_opts, save_file_fd, &ld, errmsg, sizeof(errmsg))) {
+ *secondary_errmsg = '\0';
+ goto error;
+ }
+
/* 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
in other places as well - and I don't think that works all the
time in any case, due to libpcap bugs. */
- if (capture_opts->capture_child) {
/* Well, we should be able to start capturing.
- This is the child process for a sync mode capture, so sync out
- the capture file, so the header makes it to the file system,
+ Sync out the capture file, so the header makes it to the file system,
and send a "capture started successfully and capture file created"
message to our parent so that they'll open the capture file and
update its windows to indicate that we have a live capture in
progress. */
- fflush(wtap_dump_file(ld.wtap_pdh));
- sync_pipe_capstart_to_parent();
- sync_pipe_filename_to_parent(capture_opts->save_file);
+ libpcap_dump_flush(ld.pdh, NULL);
+ report_new_capture_file(capture_opts->save_file);
}
/* initialize capture stop (and alike) conditions */
/* create stop conditions */
if (capture_opts->has_autostop_filesize)
cnd_autostop_size =
- cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize);
+ cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
if (capture_opts->has_autostop_duration)
cnd_autostop_duration =
cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
}
- /* start capture info dialog */
- if(show_info) {
- capture_ui.callback_data = &ld;
- capture_ui.counts = &ld.counts;
- capture_info_create(&capture_ui, capture_opts->iface);
- }
-
/* init the time values */
- start_time = time(NULL);
- upd_time = time(NULL);
+ start_time = TIME_GET();
+ upd_time = TIME_GET();
+
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
/* WOW, everything is prepared! */
/* please fasten your seat belts, we will enter now the actual capture loop */
while (ld.go) {
- main_window_update();
-
/* dispatch incoming packets */
inpkts = capture_loop_dispatch(capture_opts, &ld, errmsg, sizeof(errmsg));
+#ifdef _WIN32
+ /* any news from our parent (signal pipe)? -> just stop the capture */
+ if (!signal_pipe_check_running()) {
+ ld.go = FALSE;
+ }
+#endif
+
if (inpkts > 0) {
- ld.packets_sync_pipe += inpkts;
+ inpkts_to_sync_pipe += inpkts;
/* check capture size condition */
- if (cnd_autostop_size != NULL && cnd_eval(cnd_autostop_size,
- (guint32)wtap_get_bytes_dumped(ld.wtap_pdh))){
+ if (cnd_autostop_size != NULL &&
+ cnd_eval(cnd_autostop_size, (guint32)ld.bytes_written)){
/* Capture size limit reached, do we have another file? */
if (capture_opts->multi_files_on) {
- if (cnd_autostop_files != NULL && cnd_eval(cnd_autostop_files, ++autostop_files)) {
- /* no files left: stop here */
+ if (cnd_autostop_files != NULL &&
+ cnd_eval(cnd_autostop_files, ++autostop_files)) {
+ /* no files left: stop here */
ld.go = FALSE;
continue;
}
/* Switch to the next ringbuffer file */
- if (ringbuf_switch_file(&ld.wtap_pdh, &capture_opts->save_file, &capture_opts->save_file_fd, &ld.err)) {
+ if (ringbuf_switch_file(&ld.pdh, &capture_opts->save_file,
+ &save_file_fd, &ld.bytes_written, &ld.err)) {
/* File switch succeeded: reset the conditions */
cnd_reset(cnd_autostop_size);
if (cnd_file_duration) {
cnd_reset(cnd_file_duration);
}
+ libpcap_dump_flush(ld.pdh, NULL);
+ report_packet_count(inpkts_to_sync_pipe);
+ inpkts_to_sync_pipe = 0;
+ report_new_capture_file(capture_opts->save_file);
} else {
/* File switch failed: stop here */
ld.go = FALSE;
continue;
}
} /* cnd_autostop_size */
+ if (capture_opts->output_to_pipe) {
+ libpcap_dump_flush(ld.pdh, NULL);
+ }
} /* inpkts */
- /* Only update once a second so as not to overload slow displays */
- cur_time = time(NULL);
- if (cur_time > upd_time) {
- upd_time = cur_time;
+ /* Only update once a second (Win32: 500ms) so as not to overload slow displays */
+ cur_time = TIME_GET();
+#ifdef _WIN32
+ if ( (cur_time - upd_time) > 500) {
+#else
+ if (cur_time - upd_time > 0) {
+#endif
+ upd_time = cur_time;
/*if (pcap_stats(pch, stats) >= 0) {
*stats_known = TRUE;
}*/
- /* calculate and display running time */
- if(show_info) {
- cur_time -= start_time;
- capture_ui.running_time = cur_time;
- capture_ui.new_packets = ld.packets_sync_pipe;
- capture_info_update(&capture_ui);
- }
-
/* Let the parent process know. */
- if (ld.packets_sync_pipe) {
+ if (inpkts_to_sync_pipe) {
/* do sync here */
- fflush(wtap_dump_file(ld.wtap_pdh));
+ libpcap_dump_flush(ld.pdh, NULL);
- if (capture_opts->capture_child) {
- /* This is the child process for a sync mode capture, so send
- our parent a message saying we've written out "ld.sync_packets"
- packets to the capture file. */
- sync_pipe_packet_count_to_parent(ld.packets_sync_pipe);
- }
+ /* Send our parent a message saying we've written out "inpkts_to_sync_pipe"
+ packets to the capture file. */
+ report_packet_count(inpkts_to_sync_pipe);
- ld.packets_sync_pipe = 0;
+ inpkts_to_sync_pipe = 0;
}
/* check capture duration condition */
ld.go = FALSE;
continue;
}
-
+
/* check capture file duration condition */
if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
/* duration limit reached, do we have another file? */
if (capture_opts->multi_files_on) {
- if (cnd_autostop_files != NULL && cnd_eval(cnd_autostop_files, ++autostop_files)) {
+ if (cnd_autostop_files != NULL &&
+ cnd_eval(cnd_autostop_files, ++autostop_files)) {
/* no files left: stop here */
ld.go = FALSE;
continue;
}
/* Switch to the next ringbuffer file */
- if (ringbuf_switch_file(&ld.wtap_pdh, &capture_opts->save_file, &capture_opts->save_file_fd, &ld.err)) {
+ if (ringbuf_switch_file(&ld.pdh, &capture_opts->save_file,
+ &save_file_fd, &ld.bytes_written, &ld.err)) {
/* file switch succeeded: reset the conditions */
cnd_reset(cnd_file_duration);
if(cnd_autostop_size)
cnd_reset(cnd_autostop_size);
+ libpcap_dump_flush(ld.pdh, NULL);
+ report_packet_count(inpkts_to_sync_pipe);
+ inpkts_to_sync_pipe = 0;
+ report_new_capture_file(capture_opts->save_file);
} else {
/* File switch failed: stop here */
- ld.go = FALSE;
+ ld.go = FALSE;
continue;
}
} else {
} /* while (ld.go) */
- /* close capture info dialog */
- if(show_info) {
- capture_info_destroy(&capture_ui);
- }
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
/* delete stop conditions */
if (cnd_file_duration != NULL)
if (ld.pcap_err) {
g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
pcap_geterr(ld.pcap_h));
- capture_loop_popup_errmsg(capture_opts, errmsg);
+ report_capture_error(errmsg, please_report);
}
-#ifndef _WIN32
else if (ld.from_cap_pipe && ld.cap_pipe_err == PIPERR)
- capture_loop_popup_errmsg(capture_opts, errmsg);
-#endif
+ report_capture_error(errmsg, "");
/* did we had an error while capturing? */
if (ld.err == 0) {
} else {
capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, ld.err,
FALSE);
- capture_loop_popup_errmsg(capture_opts, errmsg);
+ report_capture_error(errmsg, please_report);
write_ok = FALSE;
}
- /* close the wiretap (output) file */
- close_ok = capture_loop_close_output(capture_opts, &ld, &err_close);
+ if (capture_opts->saving_to_file) {
+ /* close the wiretap (output) file */
+ close_ok = capture_loop_close_output(capture_opts, &ld, &err_close);
+ } else
+ close_ok = TRUE;
+
+ /* there might be packets not yet notified to the parent */
+ /* (do this after closing the file, so all packets are already flushed) */
+ if(inpkts_to_sync_pipe) {
+ report_packet_count(inpkts_to_sync_pipe);
+ inpkts_to_sync_pipe = 0;
+ }
/* If we've displayed a message about a write error, there's no point
in displaying another message about an error on close. */
if (!close_ok && write_ok) {
capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
TRUE);
- capture_loop_popup_errmsg(capture_opts, errmsg);
+ report_capture_error(errmsg, "");
}
/*
dropped. */
if (pcap_stats(ld.pcap_h, stats) >= 0) {
*stats_known = TRUE;
- if (capture_opts->capture_child) {
- /* Let the parent process know. */
- sync_pipe_drops_to_parent(stats->ps_drop);
- }
+ /* Let the parent process know. */
+ report_packet_drops(stats->ps_drop);
} else {
g_snprintf(errmsg, sizeof(errmsg),
"Can't get packet-drop statistics: %s",
pcap_geterr(ld.pcap_h));
- capture_loop_popup_errmsg(capture_opts, errmsg);
+ report_capture_error(errmsg, please_report);
}
}
/* close the input file (pcap or capture pipe) */
capture_loop_close_input(&ld);
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
+
/* ok, if the write and the close were successful. */
return write_ok && close_ok;
/* cleanup ringbuffer */
ringbuf_error_cleanup();
} else {
- /* We can't use the save file, and we have no wtap_dump stream
+ /* We can't use the save file, and we have no FILE * for the stream
to close in order to close it, so close the FD directly. */
- close(capture_opts->save_file_fd);
+ if(save_file_fd != -1) {
+ eth_close(save_file_fd);
+ }
/* We couldn't even start the capture, so get rid of the capture
file. */
- unlink(capture_opts->save_file); /* silently ignore error */
- g_free(capture_opts->save_file);
+ if(capture_opts->save_file != NULL) {
+ eth_unlink(capture_opts->save_file);
+ g_free(capture_opts->save_file);
+ }
}
capture_opts->save_file = NULL;
- capture_loop_popup_errmsg(capture_opts, errmsg);
+ if (cfilter_error)
+ report_cfilter_error(capture_opts->cfilter, errmsg);
+ else
+ report_capture_error(errmsg, secondary_errmsg);
/* close the input file (pcap or cap_pipe) */
capture_loop_close_input(&ld);
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
+
return FALSE;
}
void capture_loop_stop(void)
{
- ld.go = FALSE;
+#ifdef HAVE_PCAP_BREAKLOOP
+ if(ld.pcap_h != NULL)
+ pcap_breakloop(ld.pcap_h);
+#endif
+ ld.go = FALSE;
}
-
+
static void
capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
}
}
-static void
-capture_loop_popup_errmsg(capture_options *capture_opts, const char *errmsg)
-{
- if (capture_opts->capture_child) {
- /* This is the child process for a sync mode capture.
- Send the error message to our parent, so they can display a
- dialog box containing it. */
- sync_pipe_errmsg_to_parent(errmsg);
- } else {
- /* Display the dialog box ourselves; there's no parent. */
- simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "%s", errmsg);
- }
-}
-
/* one packet was captured, process it */
static void
-capture_loop_packet_cb(guchar *user, const struct pcap_pkthdr *phdr,
- const guchar *pd)
+capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
+ const u_char *pd)
{
- struct wtap_pkthdr whdr;
- union wtap_pseudo_header pseudo_header;
loop_data *ld = (loop_data *) user;
int err;
/* if the user told us to stop after x packets, do we have enough? */
- ld->counts.total++;
- if ((ld->packets_max > 0) && (ld->counts.total >= ld->packets_max))
+ ld->packet_count++;
+ if ((ld->packet_max > 0) && (ld->packet_count >= ld->packet_max))
{
ld->go = FALSE;
}
- /* Convert from libpcap to Wiretap format.
- If that fails, set "ld->go" to FALSE, to stop the capture, and set
- "ld->err" to the error. */
- pd = wtap_process_pcap_packet(ld->wtap_linktype, phdr, pd, &pseudo_header,
- &whdr, &err);
- if (pd == NULL) {
- ld->go = FALSE;
- ld->err = err;
- return;
- }
-
- if (ld->wtap_pdh) {
+ if (ld->pdh) {
/* We're supposed to write the packet to a file; do so.
If this fails, set "ld->go" to FALSE, to stop the capture, and set
"ld->err" to the error. */
- if (!wtap_dump(ld->wtap_pdh, &whdr, &pseudo_header, pd, &err)) {
+ if (!libpcap_write_packet(ld->pdh, phdr, pd, &ld->bytes_written, &err)) {
ld->go = FALSE;
ld->err = err;
}
}
-
- switch (ld->wtap_linktype) {
- case WTAP_ENCAP_ETHERNET:
- capture_eth(pd, 0, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_FDDI:
- case WTAP_ENCAP_FDDI_BITSWAPPED:
- 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, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_NULL:
- capture_null(pd, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_PPP:
- capture_ppp_hdlc(pd, 0, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_RAW_IP:
- capture_raw(pd, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_SLL:
- capture_sll(pd, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_LINUX_ATM_CLIP:
- capture_clip(pd, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_IEEE_802_11:
- case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
- capture_ieee80211(pd, 0, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_CHDLC:
- capture_chdlc(pd, 0, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_LOCALTALK:
- capture_llap(&ld->counts);
- break;
- case WTAP_ENCAP_ATM_PDUS:
- capture_atm(&pseudo_header, pd, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_IP_OVER_FC:
- capture_ipfc(pd, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_ARCNET:
- capture_arcnet(pd, whdr.caplen, &ld->counts, FALSE, TRUE);
- break;
- case WTAP_ENCAP_ARCNET_LINUX:
- capture_arcnet(pd, whdr.caplen, &ld->counts, TRUE, FALSE);
- break;
- case WTAP_ENCAP_APPLE_IP_OVER_IEEE1394:
- capture_ap1394(pd, 0, whdr.caplen, &ld->counts);
- break;
- case WTAP_ENCAP_FRELAY:
- case WTAP_ENCAP_FRELAY_WITH_PHDR:
- capture_fr(pd, 0, whdr.caplen, &ld->counts);
- break;
- /* XXX - some ATM drivers on FreeBSD might prepend a 4-byte ATM
- pseudo-header to DLT_ATM_RFC1483, with LLC header following;
- we might have to implement that at some point. */
- }
}
#endif /* HAVE_LIBPCAP */
-
git.samba.org / obnox / wireshark / wip.git / blobdiff