*
* $Id$
*
- * 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 "log.h"
#include "file_util.h"
+#include "epan/unicode-utils.h"
#include "capture_loop.h"
* Standard secondary message for unexpected errors.
*/
static const char please_report[] =
- "Please report this to the Ethereal developers";
+ "Please report this to the Wireshark developers. (This is not a crash;\n"
+ "please do not report it as such.)";
/*
* This needs to be static, so that the SIGUSR1 handler can clear the "go"
* 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(u_char *user, const struct pcap_pkthdr *phdr,
const u_char *pd);
-#ifndef _WIN32
/* Take care of byte order in the libpcap headers read from pipes.
* (function taken from wiretap/libpcap.c) */
static void
}
}
+/* 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 (T)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 {
+#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;
* 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);
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 "
+ "due to error on pipe open: %s", strerror(errno));
+ 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");
/* 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. */
-int
-cap_pipe_dispatch(int fd, loop_data *ld, struct pcap_hdr *hdr,
- struct pcaprec_modified_hdr *rechdr, guchar *data,
- char *errmsg, int errmsgl)
+static int
+cap_pipe_dispatch(loop_data *ld, guchar *data, char *errmsg, int errmsgl)
{
struct pcap_pkthdr phdr;
int b;
/* 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->cap_pipe_byte_swapped, 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->packet_count+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;
ld->packet_cb((u_char *)ld, &phdr, data);
/* 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) */
{
gchar open_err_str[PCAP_ERRBUF_SIZE];
gchar *sync_msg_str;
-#ifdef _WIN32
- gchar *sync_secondary_msg_str;
-#endif
+ 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 ";
- const 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 tethereal? */
+/* 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 */
"\n"
"Nonetheless, the capture is started.\n",
capture_opts->buffer_size);
- sync_pipe_errmsg_to_parent("Couldn't set the capture buffer size!",
+ report_capture_error("Couldn't set the capture buffer size!",
sync_secondary_msg_str);
g_free(sync_secondary_msg_str);
}
if (set_linktype_err_str != NULL) {
g_snprintf(errmsg, errmsg_len, "Unable to set data link type (%s).",
set_linktype_err_str);
- g_snprintf(secondary_errmsg, secondary_errmsg_len,
- "Please report this to the Ethereal developers");
+ 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. */
-
- /* On Win32 OSes, the capture devices are probably available to all
- users; don't warn about permissions problems.
-
- Do, however, warn about the lack of 64-bit support, and warn that
- WAN devices aren't supported. */
- g_snprintf(errmsg, errmsg_len,
-"The capture session could not be initiated.\n"
-"\"%s\"",
- open_err_str);
- 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.ethereal.com/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);
- 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 (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 (T)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 (T)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"
- "(T)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"
libpcap_warn = "";
g_snprintf(errmsg, errmsg_len,
"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 tethereal? */
+/* XXX - will this work for tshark? */
#ifdef MUST_DO_SELECT
if (!ld->from_cap_pipe) {
#ifdef HAVE_PCAP_GET_SELECTABLE_FD
returned a warning; print it, but keep capturing. */
if (open_err_str[0] != '\0') {
sync_msg_str = g_strdup_printf("%s.", open_err_str);
- sync_pipe_errmsg_to_parent(sync_msg_str, "");
+ report_capture_error(sync_msg_str, "");
g_free(sync_msg_str);
}
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
-#ifndef _WIN32
/* if open, close the capture pipe "input file" */
if (ld->cap_pipe_fd >= 0) {
g_assert(ld->from_cap_pipe);
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();
/* 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 pcap_encap;
int file_snaplen;
int err;
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
- /* get packet encapsulation type and snaplen */
-#ifndef _WIN32
+ /* 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->linktype = pcap_encap;
if (capture_opts->multi_files_on) {
- ld->pdh = ringbuf_init_libpcap_fdopen(ld->linktype, file_snaplen, &err);
+ ld->pdh = ringbuf_init_libpcap_fdopen(ld->linktype, file_snaplen,
+ &ld->bytes_written, &err);
} else {
ld->pdh = libpcap_fdopen(save_file_fd, ld->linktype, file_snaplen,
&ld->bytes_written, &err);
if (ld->pdh == NULL) {
/* We couldn't set up to write to the capture file. */
- /* XXX - use cf_open_error_message from tethereal instead? */
+ /* XXX - use cf_open_error_message from tshark instead? */
switch (err) {
case WTAP_ERR_CANT_OPEN:
}
/* dispatch incoming packets (pcap or capture pipe) */
-static int
+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;
guchar pcap_data[WTAP_MAX_PACKET_SIZE];
-#endif
-#ifndef _WIN32
- if (ld->from_cap_pipe) {
- /* dispatch from capture pipe */
+ if (ld->from_cap_pipe) {
+ /* dispatch from capture pipe */
#ifdef LOG_CAPTURE_VERBOSE
- g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
#endif
- 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;
+ 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));
- sync_pipe_errmsg_to_parent(errmsg, please_report);
+ 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, &ld->cap_pipe_rechdr, pcap_data,
- errmsg, errmsg_len);
- if (inpkts < 0) {
- ld->go = FALSE;
- }
}
}
else
-#endif /* _WIN32 */
- {
- /* dispatch from pcap */
-#ifdef MUST_DO_SELECT
- /*
- * 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.
- *
- * "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.
- *
- * 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 Ethereal might block,
- * unable to accept user input, until a packet arrives. If
- * that's unacceptable, plead with whoever supplies the software
- * for that device to add "select()" support.
- */
-#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) {
- 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, ld->packet_cb, (u_char *)ld);
- if (inpkts < 0) {
- ld->pcap_err = TRUE;
- ld->go = FALSE;
- }
- } else {
- inpkts = 0;
- if (sel_ret < 0 && errno != EINTR) {
- g_snprintf(errmsg, errmsg_len,
- "Unexpected error from select: %s", strerror(errno));
- sync_pipe_errmsg_to_parent(errmsg, please_report);
- ld->go = FALSE;
- }
- }
- }
- else
#endif /* MUST_DO_SELECT */
- {
- /* dispatch from pcap without 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");
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
#endif
- inpkts = pcap_dispatch(ld->pcap_h, 1, ld->packet_cb, (u_char *) ld);
- if (inpkts < 0) {
+#ifdef _WIN32
+ /*
+ * 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;
}
-#else
- {
+ 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");
+ 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, see http://wiki.ethereal.com/CaptureSetup_2fWinPcapRemote */
- /* for reference, an example remote interface: rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C} */
+ /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
- /* emulate dispatch from pcap */
- int in;
- struct pcap_pkthdr *pkt_header;
- u_char *pkt_data;
+ /*
+ * 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.
+ *
+ * For reference, an example remote interface:
+ * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
+ */
- inpkts = 0;
- while( (in = pcap_next_ex(ld->pcap_h, &pkt_header, &pkt_data)) == 1) {
- ld->packet_cb( (u_char *) ld, pkt_header, pkt_data);
- inpkts++;
- }
+ /* emulate dispatch from pcap */
+ {
+ int in;
+ struct pcap_pkthdr *pkt_header;
+ u_char *pkt_data;
+
+ inpkts = 0;
+ 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;
- }
+ if(in < 0) {
+ ld->pcap_err = TRUE;
+ ld->go = FALSE;
+ inpkts = in;
}
-#endif
}
+#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"));
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
#endif
- return inpkts;
+ return inpkts;
}
gboolean is_tempfile;
- g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
+ 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.
+ /* 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.
*/
g_snprintf(errmsg, errmsg_len,
"The file to which the capture would be saved (\"%s\") "
- "could not be opened: %s.", capfile_name,
+ "could not be opened: %s.", capfile_name,
strerror(errno));
}
g_free(capfile_name);
}
-#ifndef _WIN32
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();
}
-#endif
#ifdef _WIN32
#define TIME_GET() GetTickCount()
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;
gboolean write_ok;
gboolean close_ok;
gboolean cfilter_error = FALSE;
- char errmsg[4096+1];
- char secondary_errmsg[4096+1];
+#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;
ld.pcap_err = FALSE;
ld.from_cap_pipe = FALSE;
ld.pdh = NULL;
-#ifndef _WIN32
ld.cap_pipe_fd = -1;
-#endif
#ifdef MUST_DO_SELECT
ld.pcap_fd = 0;
#endif
* Catch SIGUSR1, so that we exit cleanly if the parent process
* kills us with it due to the user selecting "Capture->Stop".
*/
- signal(SIGUSR1, capture_loop_stop_signal_handler);
-#endif
+ 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);
goto error;
}
- /* open the output file (temporary/specified name/ringbuffer) */
- if (!capture_loop_open_output(capture_opts, &save_file_fd, errmsg, sizeof(errmsg))) {
- *secondary_errmsg = '\0';
- 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;
- }
+ /* 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
in other places as well - and I don't think that works all the
time in any case, due to libpcap bugs. */
- /* Well, we should be able to start capturing.
+ /* Well, we should be able to start capturing.
- 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. */
- libpcap_dump_flush(ld.pdh, NULL);
- sync_pipe_filename_to_parent(capture_opts->save_file);
+ 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. */
+ libpcap_dump_flush(ld.pdh, NULL);
+ report_new_capture_file(capture_opts->save_file);
+ }
/* initialize capture stop (and alike) conditions */
init_capture_stop_conditions();
inpkts_to_sync_pipe += inpkts;
/* check capture size condition */
- if (cnd_autostop_size != NULL && cnd_eval(cnd_autostop_size,
- (guint32)ld.bytes_written)){
+ 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.pdh, &capture_opts->save_file, &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);
- sync_pipe_packet_count_to_parent(inpkts_to_sync_pipe);
+ report_packet_count(inpkts_to_sync_pipe);
inpkts_to_sync_pipe = 0;
- sync_pipe_filename_to_parent(capture_opts->save_file);
+ report_new_capture_file(capture_opts->save_file);
} else {
/* File switch failed: stop here */
ld.go = FALSE;
/* Send our parent a message saying we've written out "inpkts_to_sync_pipe"
packets to the capture file. */
- sync_pipe_packet_count_to_parent(inpkts_to_sync_pipe);
+ report_packet_count(inpkts_to_sync_pipe);
inpkts_to_sync_pipe = 0;
}
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.pdh, &capture_opts->save_file, &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);
- sync_pipe_packet_count_to_parent(inpkts_to_sync_pipe);
+ report_packet_count(inpkts_to_sync_pipe);
inpkts_to_sync_pipe = 0;
- sync_pipe_filename_to_parent(capture_opts->save_file);
+ report_new_capture_file(capture_opts->save_file);
} else {
/* File switch failed: stop here */
- ld.go = FALSE;
+ ld.go = FALSE;
continue;
}
} else {
if (ld.pcap_err) {
g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
pcap_geterr(ld.pcap_h));
- sync_pipe_errmsg_to_parent(errmsg, please_report);
+ report_capture_error(errmsg, please_report);
}
-#ifndef _WIN32
else if (ld.from_cap_pipe && ld.cap_pipe_err == PIPERR)
- sync_pipe_errmsg_to_parent(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);
- sync_pipe_errmsg_to_parent(errmsg, please_report);
+ 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) {
- sync_pipe_packet_count_to_parent(inpkts_to_sync_pipe);
+ report_packet_count(inpkts_to_sync_pipe);
inpkts_to_sync_pipe = 0;
}
if (!close_ok && write_ok) {
capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
TRUE);
- sync_pipe_errmsg_to_parent(errmsg, "");
+ report_capture_error(errmsg, "");
}
/*
if (pcap_stats(ld.pcap_h, stats) >= 0) {
*stats_known = TRUE;
/* Let the parent process know. */
- sync_pipe_drops_to_parent(stats->ps_drop);
+ report_packet_drops(stats->ps_drop);
} else {
g_snprintf(errmsg, sizeof(errmsg),
"Can't get packet-drop statistics: %s",
pcap_geterr(ld.pcap_h));
- sync_pipe_errmsg_to_parent(errmsg, please_report);
+ report_capture_error(errmsg, please_report);
}
}
}
capture_opts->save_file = NULL;
if (cfilter_error)
- sync_pipe_cfilter_error_to_parent(capture_opts->cfilter, errmsg);
+ report_cfilter_error(capture_opts->cfilter, errmsg);
else
- sync_pipe_errmsg_to_parent(errmsg, secondary_errmsg);
+ report_capture_error(errmsg, secondary_errmsg);
/* close the input file (pcap or cap_pipe) */
capture_loop_close_input(&ld);
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,
}
#endif /* HAVE_LIBPCAP */
-
git.samba.org / obnox / wireshark / wip.git / blobdiff