2 * The actual capturing loop, getting packets and storing it
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@ethereal.com>
8 * Copyright 1998 Gerald Combs
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
28 * Capture loop (internal interface).
30 * It will open the input and output files, capture the packets,
31 * change ringbuffer output files while capturing and close all files again.
33 * The input file can be a network interface or capture pipe (unix only).
34 * The output file can be a single or a ringbuffer file handled by wiretap.
54 #ifdef HAVE_SYS_TYPES_H
55 # include <sys/types.h>
58 #ifdef HAVE_SYS_STAT_H
59 # include <sys/stat.h>
69 #include <epan/packet.h>
71 #include "capture_sync.h"
72 #include "pcap-util.h"
74 #include "simple_dialog.h"
75 #include "conditions.h"
76 #include "capture_stop_conditions.h"
77 #include "ringbuffer.h"
79 #include "wiretap/libpcap.h"
80 #include "wiretap/wtap.h"
81 #include "wiretap/wtap-capture.h"
83 #include <epan/prefs.h>
84 /* XXX - try to remove this later */
86 /* XXX - try to remove this later */
88 #include "alert_box.h"
92 #include <epan/dissectors/packet-ap1394.h>
93 #include <epan/dissectors/packet-atalk.h>
94 #include <epan/dissectors/packet-atm.h>
95 #include <epan/dissectors/packet-clip.h>
96 #include <epan/dissectors/packet-eth.h>
97 #include <epan/dissectors/packet-fddi.h>
98 #include <epan/dissectors/packet-fr.h>
99 #include <epan/dissectors/packet-null.h>
100 #include <epan/dissectors/packet-ppp.h>
101 #include <epan/dissectors/packet-raw.h>
102 #include <epan/dissectors/packet-sll.h>
103 #include <epan/dissectors/packet-tr.h>
104 #include <epan/dissectors/packet-ieee80211.h>
105 #include <epan/dissectors/packet-chdlc.h>
106 #include <epan/dissectors/packet-prism.h>
107 #include <epan/dissectors/packet-ipfc.h>
108 #include <epan/dissectors/packet-arcnet.h>
110 /* Win32 needs the O_BINARY flag for open() */
118 * We don't want to do a "select()" on the pcap_t's file descriptor on
119 * BSD (because "select()" doesn't work correctly on BPF devices on at
120 * least some releases of some flavors of BSD), and we don't want to do
121 * it on Windows (because "select()" is something for sockets, not for
122 * arbitrary handles). (Note that "Windows" here includes Cygwin;
123 * even in its pretend-it's-UNIX environment, we're using WinPcap, not
126 * We *do* want to do it on other platforms, as, on other platforms (with
127 * the possible exception of Ultrix and Digital UNIX), the read timeout
128 * doesn't expire if no packets have arrived, so a "pcap_dispatch()" call
129 * will block until packets arrive, causing the UI to hang.
131 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
132 * want to include it if it's not present on this platform, however.
134 #if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
135 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
137 # define MUST_DO_SELECT
141 typedef struct _loop_data {
143 gboolean go; /* TRUE as long as we're supposed to keep capturing */
144 int err; /* if non-zero, error seen while capturing */
145 gint packets_max; /* Number of packets we're supposed to capture - 0 means infinite */
146 gint packets_sync_pipe; /* packets not already send out to the sync_pipe */
147 packet_counts counts; /* several packet type counters */
149 /* pcap "input file" */
150 pcap_t *pcap_h; /* pcap handle */
151 gboolean pcap_err; /* TRUE if error from pcap */
152 #ifdef MUST_DO_SELECT
153 int pcap_fd; /* pcap file descriptor */
156 /* capture pipe (unix only "input file") */
157 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
159 struct pcap_hdr cap_pipe_hdr;
160 struct pcaprec_modified_hdr cap_pipe_rechdr;
161 int cap_pipe_fd; /* the file descriptor of the capture pipe */
162 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
163 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
164 unsigned int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
165 unsigned int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
167 STATE_EXPECT_REC_HDR,
173 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
176 /* wiretap (output file) */
177 wtap_dumper *wtap_pdh;
184 * Timeout, in milliseconds, for reads from the stream of captured packets.
186 #define CAP_READ_TIMEOUT 250
188 static void capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
190 static void capture_loop_popup_errmsg(capture_options *capture_opts, const char *errmsg);
191 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
192 int err, gboolean is_close);
197 /* Take care of byte order in the libpcap headers read from pipes.
198 * (function taken from wiretap/libpcap.c) */
200 cap_pipe_adjust_header(loop_data *ld, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
202 if (ld->cap_pipe_byte_swapped) {
203 /* Byte-swap the record header fields. */
204 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
205 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
206 rechdr->incl_len = BSWAP32(rechdr->incl_len);
207 rechdr->orig_len = BSWAP32(rechdr->orig_len);
210 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
211 swapped, in order to match the BPF header layout.
213 Unfortunately, some files were, according to a comment in the "libpcap"
214 source, written with version 2.3 in their headers but without the
215 interchanged fields, so if "incl_len" is greater than "orig_len" - which
216 would make no sense - we assume that we need to swap them. */
217 if (hdr->version_major == 2 &&
218 (hdr->version_minor < 3 ||
219 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
222 temp = rechdr->orig_len;
223 rechdr->orig_len = rechdr->incl_len;
224 rechdr->incl_len = temp;
228 /* Mimic pcap_open_live() for pipe captures
229 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
231 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
232 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
234 cap_pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ld,
235 char *errmsg, int errmsgl)
237 struct stat pipe_stat;
241 unsigned int bytes_read;
243 struct timeval timeout;
246 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
249 * XXX Ethereal blocks until we return
251 if (strcmp(pipename, "-") == 0)
252 fd = 0; /* read from stdin */
254 if (stat(pipename, &pipe_stat) < 0) {
255 if (errno == ENOENT || errno == ENOTDIR)
256 ld->cap_pipe_err = PIPNEXIST;
258 g_snprintf(errmsg, errmsgl,
259 "The capture session could not be initiated "
260 "due to error on pipe: %s", strerror(errno));
261 ld->cap_pipe_err = PIPERR;
265 if (! S_ISFIFO(pipe_stat.st_mode)) {
266 if (S_ISCHR(pipe_stat.st_mode)) {
268 * Assume the user specified an interface on a system where
269 * interfaces are in /dev. Pretend we haven't seen it.
271 ld->cap_pipe_err = PIPNEXIST;
273 g_snprintf(errmsg, errmsgl,
274 "The capture session could not be initiated because\n"
275 "\"%s\" is neither an interface nor a pipe", pipename);
276 ld->cap_pipe_err = PIPERR;
280 fd = open(pipename, O_RDONLY | O_NONBLOCK);
282 g_snprintf(errmsg, errmsgl,
283 "The capture session could not be initiated "
284 "due to error on pipe open: %s", strerror(errno));
285 ld->cap_pipe_err = PIPERR;
290 ld->from_cap_pipe = TRUE;
292 /* read the pcap header */
295 while (bytes_read < sizeof magic) {
298 timeout.tv_usec = CAP_READ_TIMEOUT*1000;
299 sel_ret = select(fd+1, &rfds, NULL, NULL, &timeout);
301 g_snprintf(errmsg, errmsgl,
302 "Unexpected error from select: %s", strerror(errno));
304 } else if (sel_ret > 0) {
305 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
308 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
310 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
320 /* Host that wrote it has our byte order, and was running
321 a program using either standard or ss990417 libpcap. */
322 ld->cap_pipe_byte_swapped = FALSE;
323 ld->cap_pipe_modified = FALSE;
325 case PCAP_MODIFIED_MAGIC:
326 /* Host that wrote it has our byte order, but was running
327 a program using either ss990915 or ss991029 libpcap. */
328 ld->cap_pipe_byte_swapped = FALSE;
329 ld->cap_pipe_modified = TRUE;
331 case PCAP_SWAPPED_MAGIC:
332 /* Host that wrote it has a byte order opposite to ours,
333 and was running a program using either standard or
335 ld->cap_pipe_byte_swapped = TRUE;
336 ld->cap_pipe_modified = FALSE;
338 case PCAP_SWAPPED_MODIFIED_MAGIC:
339 /* Host that wrote it out has a byte order opposite to
340 ours, and was running a program using either ss990915
341 or ss991029 libpcap. */
342 ld->cap_pipe_byte_swapped = TRUE;
343 ld->cap_pipe_modified = TRUE;
346 /* Not a "libpcap" type we know about. */
347 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
351 /* Read the rest of the header */
353 while (bytes_read < sizeof(struct pcap_hdr)) {
356 timeout.tv_usec = CAP_READ_TIMEOUT*1000;
357 sel_ret = select(fd+1, &rfds, NULL, NULL, &timeout);
359 g_snprintf(errmsg, errmsgl,
360 "Unexpected error from select: %s", strerror(errno));
362 } else if (sel_ret > 0) {
363 b = read(fd, ((char *)hdr)+bytes_read,
364 sizeof(struct pcap_hdr) - bytes_read);
367 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
369 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
377 if (ld->cap_pipe_byte_swapped) {
378 /* Byte-swap the header fields about which we care. */
379 hdr->version_major = BSWAP16(hdr->version_major);
380 hdr->version_minor = BSWAP16(hdr->version_minor);
381 hdr->snaplen = BSWAP32(hdr->snaplen);
382 hdr->network = BSWAP32(hdr->network);
385 if (hdr->version_major < 2) {
386 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
390 ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
391 ld->cap_pipe_err = PIPOK;
395 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
396 ld->cap_pipe_err = PIPERR;
403 /* We read one record from the pipe, take care of byte order in the record
404 * header, write the record to the capture file, and update capture statistics. */
406 cap_pipe_dispatch(int fd, loop_data *ld, struct pcap_hdr *hdr,
407 struct pcaprec_modified_hdr *rechdr, guchar *data,
408 char *errmsg, int errmsgl)
410 struct pcap_pkthdr phdr;
412 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
416 #ifdef LOG_CAPTURE_VERBOSE
417 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
420 switch (ld->cap_pipe_state) {
422 case STATE_EXPECT_REC_HDR:
423 ld->cap_pipe_bytes_to_read = ld->cap_pipe_modified ?
424 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
425 ld->cap_pipe_bytes_read = 0;
426 ld->cap_pipe_state = STATE_READ_REC_HDR;
429 case STATE_READ_REC_HDR:
430 b = read(fd, ((char *)rechdr)+ld->cap_pipe_bytes_read,
431 ld->cap_pipe_bytes_to_read - ld->cap_pipe_bytes_read);
434 result = PD_PIPE_EOF;
436 result = PD_PIPE_ERR;
439 if ((ld->cap_pipe_bytes_read += b) < ld->cap_pipe_bytes_to_read)
441 result = PD_REC_HDR_READ;
444 case STATE_EXPECT_DATA:
445 ld->cap_pipe_bytes_read = 0;
446 ld->cap_pipe_state = STATE_READ_DATA;
449 case STATE_READ_DATA:
450 b = read(fd, data+ld->cap_pipe_bytes_read, rechdr->hdr.incl_len - ld->cap_pipe_bytes_read);
453 result = PD_PIPE_EOF;
455 result = PD_PIPE_ERR;
458 if ((ld->cap_pipe_bytes_read += b) < rechdr->hdr.incl_len)
460 result = PD_DATA_READ;
464 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
467 } /* switch (ld->cap_pipe_state) */
470 * We've now read as much data as we were expecting, so process it.
474 case PD_REC_HDR_READ:
475 /* We've read the header. Take care of byte order. */
476 cap_pipe_adjust_header(ld, hdr, &rechdr->hdr);
477 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
478 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
479 ld->counts.total+1, rechdr->hdr.incl_len);
482 ld->cap_pipe_state = STATE_EXPECT_DATA;
486 /* Fill in a "struct pcap_pkthdr", and process the packet. */
487 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
488 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
489 phdr.caplen = rechdr->hdr.incl_len;
490 phdr.len = rechdr->hdr.orig_len;
492 capture_loop_packet_cb((u_char *)ld, &phdr, data);
494 ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
498 ld->cap_pipe_err = PIPEOF;
502 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
509 ld->cap_pipe_err = PIPERR;
510 /* Return here rather than inside the switch to prevent GCC warning */
513 #endif /* not _WIN32 */
516 /* open the capture input file (pcap or capture pipe) */
517 static int capture_loop_open_input(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len) {
518 gchar open_err_str[PCAP_ERRBUF_SIZE];
519 const char *set_linktype_err_str;
522 WORD wVersionRequested;
525 static const char ppamsg[] = "can't find PPA for ";
526 const char *libpcap_warn;
530 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", capture_opts->iface);
532 /* Initialize Windows Socket if we are in a WIN32 OS
533 This needs to be done before querying the interface for network/netmask */
535 /* XXX - do we really require 1.1 or earlier?
536 Are there any versions that support only 2.0 or higher? */
537 wVersionRequested = MAKEWORD(1, 1);
538 err = WSAStartup(wVersionRequested, &wsaData);
543 g_snprintf(errmsg, errmsg_len,
544 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
547 case WSAVERNOTSUPPORTED:
548 g_snprintf(errmsg, errmsg_len,
549 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
550 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
554 g_snprintf(errmsg, errmsg_len,
555 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
559 g_snprintf(errmsg, errmsg_len,
560 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
564 g_snprintf(errmsg, errmsg_len,
565 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
569 g_snprintf(errmsg, errmsg_len,
570 "Couldn't initialize Windows Sockets: error %d", err);
577 /* Open the network interface to capture from it.
578 Some versions of libpcap may put warnings into the error buffer
579 if they succeed; to tell if that's happened, we have to clear
580 the error buffer, and check if it's still a null string. */
581 open_err_str[0] = '\0';
582 ld->pcap_h = pcap_open_live(capture_opts->iface,
583 capture_opts->has_snaplen ? capture_opts->snaplen :
584 WTAP_MAX_PACKET_SIZE,
585 capture_opts->promisc_mode, CAP_READ_TIMEOUT,
588 if (ld->pcap_h != NULL) {
589 /* we've opened "iface" as a network device */
591 /* try to set the capture buffer size */
592 if (pcap_setbuff(ld->pcap_h, capture_opts->buffer_size * 1024 * 1024) != 0) {
593 simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
594 "%sCouldn't set the capture buffer size!%s\n"
596 "The capture buffer size of %luMB seems to be too high for your machine,\n"
597 "the default of 1MB will be used.\n"
599 "Nonetheless, the capture is started.\n",
600 simple_dialog_primary_start(), simple_dialog_primary_end(), capture_opts->buffer_size);
604 /* setting the data link type only works on real interfaces */
605 if (capture_opts->linktype != -1) {
606 set_linktype_err_str = set_pcap_linktype(ld->pcap_h, capture_opts->iface,
607 capture_opts->linktype);
608 if (set_linktype_err_str != NULL) {
609 g_snprintf(errmsg, errmsg_len, "Unable to set data link type (%s).",
610 set_linktype_err_str);
615 /* We couldn't open "iface" as a network device. */
617 /* On Windows, we don't support capturing on pipes, so we give up. */
619 /* On Win32 OSes, the capture devices are probably available to all
620 users; don't warn about permissions problems.
622 Do, however, warn that WAN devices aren't supported. */
623 g_snprintf(errmsg, errmsg_len,
624 "%sThe capture session could not be initiated!%s\n"
628 "Please check that you have the proper interface specified.\n"
630 "Help can be found at: http://wiki.ethereal.com/CaptureSetup\n"
632 "WinPcap does not support 64-bit Windows, so you will not be able to capture\n"
633 "traffic with Tethereal on 64-bit Windows. You will have to use some other\n"
634 "tool to capture traffic, such as netcap; see\n"
636 " http://support.microsoft.com/?id=310875\n"
638 "for information about netcap.\n"
640 "Note that version 3.0 of WinPcap, and earlier versions of WinPcap, don't\n"
641 "support capturing on PPP/WAN interfaces on Windows NT 4.0 / 2000 / XP /\n"
643 "WinPcap 3.1 has support for it on Windows 2000 / XP / Server 2003, but has no\n"
644 "support for it on Windows NT 4.0 or Windows Vista (Beta 1).",
645 simple_dialog_primary_start(), simple_dialog_primary_end(),
649 /* try to open iface as a pipe */
650 ld->cap_pipe_fd = cap_pipe_open_live(capture_opts->iface, &ld->cap_pipe_hdr, ld, errmsg, errmsg_len);
652 if (ld->cap_pipe_fd == -1) {
654 if (ld->cap_pipe_err == PIPNEXIST) {
655 /* Pipe doesn't exist, so output message for interface */
657 /* If we got a "can't find PPA for XXX" message, warn the user (who
658 is running Ethereal on HP-UX) that they don't have a version
659 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
660 versions, which properly handle HP-UX, say "can't find /dev/dlpi
661 PPA for XXX" rather than "can't find PPA for XXX"). */
662 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
665 "You are running Ethereal with a version of the libpcap library\n"
666 "that doesn't handle HP-UX network devices well; this means that\n"
667 "Ethereal may not be able to capture packets.\n"
669 "To fix this, you should install libpcap 0.6.2, or a later version\n"
670 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
671 "packaged binary form from the Software Porting And Archive Centre\n"
672 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
673 "at the URL lists a number of mirror sites.";
676 g_snprintf(errmsg, errmsg_len,
677 "The capture session could not be initiated (%s).\n"
678 "Please check to make sure you have sufficient permissions, and that\n"
679 "you have the proper interface or pipe specified.%s", open_err_str,
683 * Else pipe (or file) does exist and cap_pipe_open_live() has
688 /* cap_pipe_open_live() succeeded; don't want
689 error message from pcap_open_live() */
690 open_err_str[0] = '\0';
694 #ifdef MUST_DO_SELECT
695 if (!ld->from_cap_pipe) {
696 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
697 ld->pcap_fd = pcap_get_selectable_fd(ld->pcap_h);
699 ld->pcap_fd = pcap_fileno(ld->pcap_h);
704 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
705 returned a warning; print it, but keep capturing. */
706 if (open_err_str[0] != '\0')
707 g_warning("%s.", open_err_str);
713 /* open the capture input file (pcap or capture pipe) */
714 static void capture_loop_close_input(loop_data *ld) {
716 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
719 /* if open, close the capture pipe "input file" */
720 if (ld->cap_pipe_fd >= 0) {
721 g_assert(ld->from_cap_pipe);
722 close(ld->cap_pipe_fd);
726 /* if open, close the pcap "input file" */
727 if(ld->pcap_h != NULL) {
728 g_assert(!ld->from_cap_pipe);
729 pcap_close(ld->pcap_h);
733 /* Shut down windows sockets */
739 /* init the capture filter */
740 static int capture_loop_init_filter(loop_data *ld, const gchar * iface, gchar * cfilter, char *errmsg, int errmsg_len) {
741 bpf_u_int32 netnum, netmask;
742 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
743 struct bpf_program fcode;
746 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
748 /* capture filters only work on real interfaces */
749 if (cfilter && !ld->from_cap_pipe) {
750 /* A capture filter was specified; set it up. */
751 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
753 * Well, we can't get the netmask for this interface; it's used
754 * only for filters that check for broadcast IP addresses, so
755 * we just punt and use 0. It might be nice to warn the user,
756 * but that's a pain in a GUI application, as it'd involve popping
757 * up a message box, and it's not clear how often this would make
758 * a difference (only filters that check for IP broadcast addresses
763 if (pcap_compile(ld->pcap_h, &fcode, cfilter, 1, netmask) < 0) {
764 dfilter_t *rfcode = NULL;
765 /* filter string invalid, did the user tried a display filter? */
766 if (dfilter_compile(cfilter, &rfcode) && rfcode != NULL) {
767 g_snprintf(errmsg, errmsg_len,
768 "%sInvalid capture filter: \"%s\"!%s\n"
770 "That string looks like a valid display filter; however, it isn't a valid\n"
771 "capture filter (%s).\n"
773 "Note that display filters and capture filters don't have the same syntax,\n"
774 "so you can't use most display filter expressions as capture filters.\n"
776 "See the help for a description of the capture filter syntax.",
777 simple_dialog_primary_start(), cfilter, simple_dialog_primary_end(),
778 pcap_geterr(ld->pcap_h));
779 dfilter_free(rfcode);
781 g_snprintf(errmsg, errmsg_len,
782 "%sInvalid capture filter: \"%s\"!%s\n"
784 "That string isn't a valid capture filter (%s).\n"
785 "See the help for a description of the capture filter syntax.",
786 simple_dialog_primary_start(), cfilter, simple_dialog_primary_end(),
787 pcap_geterr(ld->pcap_h));
791 if (pcap_setfilter(ld->pcap_h, &fcode) < 0) {
792 g_snprintf(errmsg, errmsg_len, "Can't install filter (%s).",
793 pcap_geterr(ld->pcap_h));
794 #ifdef HAVE_PCAP_FREECODE
795 pcap_freecode(&fcode);
799 #ifdef HAVE_PCAP_FREECODE
800 pcap_freecode(&fcode);
808 /* open the wiretap part of the capture output file */
809 static int capture_loop_init_wiretap_output(capture_options *capture_opts, int save_file_fd, loop_data *ld, char *errmsg, int errmsg_len) {
815 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_wiretap_output");
817 /* get packet encapsulation type and snaplen */
819 if (ld->from_cap_pipe) {
820 pcap_encap = ld->cap_pipe_hdr.network;
821 file_snaplen = ld->cap_pipe_hdr.snaplen;
825 pcap_encap = get_pcap_linktype(ld->pcap_h, capture_opts->iface);
826 file_snaplen = pcap_snapshot(ld->pcap_h);
829 /* Set up to write to the capture file. */
830 ld->wtap_linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
831 if (ld->wtap_linktype == WTAP_ENCAP_UNKNOWN) {
832 g_snprintf(errmsg, errmsg_len,
833 "The network you're capturing from is of a type"
834 " that Ethereal doesn't support (data link type %d).", pcap_encap);
837 if (capture_opts->multi_files_on) {
838 ld->wtap_pdh = ringbuf_init_wtap_dump_fdopen(WTAP_FILE_PCAP, ld->wtap_linktype,
841 ld->wtap_pdh = wtap_dump_fdopen(save_file_fd, WTAP_FILE_PCAP,
842 ld->wtap_linktype, file_snaplen, FALSE /* compressed */, &err);
845 if (ld->wtap_pdh == NULL) {
846 /* We couldn't set up to write to the capture file. */
849 case WTAP_ERR_CANT_OPEN:
850 strcpy(errmsg, "The file to which the capture would be saved"
851 " couldn't be created for some unknown reason.");
854 case WTAP_ERR_SHORT_WRITE:
855 strcpy(errmsg, "A full header couldn't be written to the file"
856 " to which the capture would be saved.");
861 g_snprintf(errmsg, errmsg_len,
862 "The file to which the capture would be"
863 " saved (\"%s\") could not be opened: Error %d.",
864 capture_opts->save_file, err);
866 g_snprintf(errmsg, errmsg_len,
867 "The file to which the capture would be"
868 " saved (\"%s\") could not be opened: %s.",
869 capture_opts->save_file, strerror(err));
880 static gboolean capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close) {
882 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
884 if (capture_opts->multi_files_on) {
885 return ringbuf_wtap_dump_close(&capture_opts->save_file, err_close);
887 return wtap_dump_close(ld->wtap_pdh, err_close);
891 /* dispatch incoming packets (pcap or capture pipe) */
893 capture_loop_dispatch(capture_options *capture_opts, loop_data *ld,
894 char *errmsg, int errmsg_len) {
898 struct timeval timeout;
900 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
904 if (ld->from_cap_pipe) {
905 /* dispatch from capture pipe */
906 #ifdef LOG_CAPTURE_VERBOSE
907 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
910 FD_SET(ld->cap_pipe_fd, &set1);
912 timeout.tv_usec = CAP_READ_TIMEOUT*1000;
913 sel_ret = select(ld->cap_pipe_fd+1, &set1, NULL, NULL, &timeout);
916 if (sel_ret < 0 && errno != EINTR) {
917 g_snprintf(errmsg, errmsg_len,
918 "Unexpected error from select: %s", strerror(errno));
919 capture_loop_popup_errmsg(capture_opts, errmsg);
924 * "select()" says we can read from the pipe without blocking
926 inpkts = cap_pipe_dispatch(ld->cap_pipe_fd, ld, &ld->cap_pipe_hdr, &ld->cap_pipe_rechdr, pcap_data,
936 /* dispatch from pcap */
937 #ifdef MUST_DO_SELECT
939 * Sigh. The semantics of the read timeout argument to
940 * "pcap_open_live()" aren't particularly well specified by
941 * the "pcap" man page - at least with the BSD BPF code, the
942 * intent appears to be, at least in part, a way of cutting
943 * down the number of reads done on a capture, by blocking
944 * until the buffer fills or a timer expires - and the Linux
945 * libpcap doesn't actually support it, so we can't use it
946 * to break out of the "pcap_dispatch()" every 1/4 of a second
947 * or so. Linux's libpcap is not the only libpcap that doesn't
948 * support the read timeout.
950 * Furthermore, at least on Solaris, the bufmod STREAMS module's
951 * read timeout won't go off if no data has arrived, i.e. it cannot
952 * be used to guarantee that a read from a DLPI stream will return
953 * within a specified amount of time regardless of whether any
954 * data arrives or not.
956 * Thus, on all platforms other than BSD, we do a "select()" on the
957 * file descriptor for the capture, with a timeout of CAP_READ_TIMEOUT
958 * milliseconds, or CAP_READ_TIMEOUT*1000 microseconds.
960 * "select()", on BPF devices, doesn't work as you might expect;
961 * at least on some versions of some flavors of BSD, the timer
962 * doesn't start until a read is done, so it won't expire if
963 * only a "select()" or "poll()" is posted.
965 * If we have "pcap_get_selectable_fd()", we use it to get the
966 * descriptor on which to select; if that's -1, it means there
967 * is no descriptor on which you can do a "select()" (perhaps
968 * because you're capturing on a special device, and that device's
969 * driver unfortunately doesn't support "select()", in which case
970 * we don't do the select - which means Ethereal might block,
971 * unable to accept user input, until a packet arrives. If
972 * that's unacceptable, plead with whoever supplies the software
973 * for that device to add "select()" support.
975 #ifdef LOG_CAPTURE_VERBOSE
976 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
978 if (ld->pcap_fd != -1) {
980 FD_SET(ld->pcap_fd, &set1);
982 timeout.tv_usec = CAP_READ_TIMEOUT*1000;
983 sel_ret = select(ld->pcap_fd+1, &set1, NULL, NULL, &timeout);
986 * "select()" says we can read from it without blocking; go for
989 inpkts = pcap_dispatch(ld->pcap_h, 1, capture_loop_packet_cb, (u_char *)ld);
996 if (sel_ret < 0 && errno != EINTR) {
997 g_snprintf(errmsg, errmsg_len,
998 "Unexpected error from select: %s", strerror(errno));
999 capture_loop_popup_errmsg(capture_opts, errmsg);
1005 #endif /* MUST_DO_SELECT */
1007 /* dispatch from pcap without select */
1009 #ifdef LOG_CAPTURE_VERBOSE
1010 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
1012 inpkts = pcap_dispatch(ld->pcap_h, 1, capture_loop_packet_cb, (u_char *) ld);
1014 ld->pcap_err = TRUE;
1019 #ifdef LOG_CAPTURE_VERBOSE
1020 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
1022 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
1024 /* WinPcap's remote capturing feature doesn't work, see http://wiki.ethereal.com/CaptureSetup_2fWinPcapRemote */
1025 /* for reference, an example remote interface: rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C} */
1027 /* emulate dispatch from pcap */
1029 struct pcap_pkthdr *pkt_header;
1033 while( (in = pcap_next_ex(ld->pcap_h, &pkt_header, &pkt_data)) == 1) {
1034 capture_loop_packet_cb( (u_char *) ld, pkt_header, pkt_data);
1039 ld->pcap_err = TRUE;
1048 #ifdef LOG_CAPTURE_VERBOSE
1049 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
1056 /* open the output file (temporary/specified name/ringbuffer) */
1057 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
1059 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
1060 char *errmsg, int errmsg_len) {
1062 char tmpname[128+1];
1063 gchar *capfile_name;
1064 gboolean is_tempfile;
1067 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
1068 (capture_opts->save_file) ? capture_opts->save_file : "");
1070 if (capture_opts->save_file != NULL) {
1071 /* We return to the caller while the capture is in progress.
1072 * Therefore we need to take a copy of save_file in
1073 * case the caller destroys it after we return.
1075 capfile_name = g_strdup(capture_opts->save_file);
1076 if (capture_opts->multi_files_on) {
1077 /* ringbuffer is enabled */
1078 *save_file_fd = ringbuf_init(capfile_name,
1079 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0);
1081 /* we need the ringbuf name */
1082 if(*save_file_fd != -1) {
1083 g_free(capfile_name);
1084 capfile_name = g_strdup(ringbuf_current_filename());
1087 /* Try to open/create the specified file for use as a capture buffer. */
1088 *save_file_fd = open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
1091 is_tempfile = FALSE;
1093 /* Choose a random name for the temporary capture buffer */
1094 *save_file_fd = create_tempfile(tmpname, sizeof tmpname, "ether");
1095 capfile_name = g_strdup(tmpname);
1099 /* did we fail to open the output file? */
1100 if (*save_file_fd == -1) {
1102 g_snprintf(errmsg, errmsg_len,
1103 "The temporary file to which the capture would be saved (\"%s\") "
1104 "could not be opened: %s.", capfile_name, strerror(errno));
1106 if (capture_opts->multi_files_on) {
1107 ringbuf_error_cleanup();
1110 g_snprintf(errmsg, errmsg_len,
1111 "The file to which the capture would be saved (\"%s\") "
1112 "could not be opened: %s.", capfile_name,
1115 /*open_failure_alert_box(capfile_name, errno, TRUE);*/
1117 g_free(capfile_name);
1121 if(capture_opts->save_file != NULL) {
1122 g_free(capture_opts->save_file);
1124 capture_opts->save_file = capfile_name;
1125 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
1126 "g_free(capfile_name)". */
1134 capture_loop_stop_signal_handler(int signo _U_)
1136 capture_loop_stop();
1141 #define TIME_GET() GetTickCount()
1143 #define TIME_GET() time(NULL)
1147 * This needs to be static, so that the SIGUSR1 handler can clear the "go"
1150 static loop_data ld;
1152 /* Do the low-level work of a capture.
1153 Returns TRUE if it succeeds, FALSE otherwise. */
1155 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
1157 time_t upd_time, cur_time;
1159 int err_close, inpkts;
1160 condition *cnd_file_duration = NULL;
1161 condition *cnd_autostop_files = NULL;
1162 condition *cnd_autostop_size = NULL;
1163 condition *cnd_autostop_duration = NULL;
1164 guint32 autostop_files = 0;
1167 capture_info capture_ui;
1168 char errmsg[4096+1];
1172 /* init the loop data */
1174 if (capture_opts->has_autostop_packets)
1175 ld.packets_max = capture_opts->autostop_packets;
1177 ld.packets_max = 0; /* no limit */
1178 ld.err = 0; /* no error seen yet */
1179 ld.wtap_linktype = WTAP_ENCAP_UNKNOWN;
1180 ld.pcap_err = FALSE;
1181 ld.from_cap_pipe = FALSE;
1182 ld.packets_sync_pipe = 0;
1183 ld.counts.total = 0;
1191 ld.counts.netbios = 0;
1192 ld.counts.vines = 0;
1193 ld.counts.other = 0;
1197 ld.cap_pipe_fd = -1;
1199 #ifdef MUST_DO_SELECT
1205 * Catch SIGUSR1, so that we exit cleanly if the parent process
1206 * kills us with it due to the user selecting "Capture->Stop".
1208 signal(SIGUSR1, capture_loop_stop_signal_handler);
1211 /* We haven't yet gotten the capture statistics. */
1212 *stats_known = FALSE;
1214 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture child starting ...");
1215 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
1217 /* open the output file (temporary/specified name/ringbuffer) */
1218 if (!capture_loop_open_output(capture_opts, &save_file_fd, errmsg, sizeof(errmsg))) {
1222 /* open the "input file" from network interface or capture pipe */
1223 if (!capture_loop_open_input(capture_opts, &ld, errmsg, sizeof(errmsg))) {
1227 /* init the input filter from the network interface (capture pipe will do nothing) */
1228 if (!capture_loop_init_filter(&ld, capture_opts->iface, capture_opts->cfilter, errmsg, sizeof(errmsg))) {
1232 /* open the wiretap part of the output file (the output file is already open) */
1233 if (!capture_loop_init_wiretap_output(capture_opts, save_file_fd, &ld, errmsg, sizeof(errmsg))) {
1237 /* XXX - capture SIGTERM and close the capture, in case we're on a
1238 Linux 2.0[.x] system and you have to explicitly close the capture
1239 stream in order to turn promiscuous mode off? We need to do that
1240 in other places as well - and I don't think that works all the
1241 time in any case, due to libpcap bugs. */
1243 /* Well, we should be able to start capturing.
1245 Sync out the capture file, so the header makes it to the file system,
1246 and send a "capture started successfully and capture file created"
1247 message to our parent so that they'll open the capture file and
1248 update its windows to indicate that we have a live capture in
1250 wtap_dump_flush(ld.wtap_pdh);
1251 sync_pipe_filename_to_parent(capture_opts->save_file);
1253 /* initialize capture stop (and alike) conditions */
1254 init_capture_stop_conditions();
1255 /* create stop conditions */
1256 if (capture_opts->has_autostop_filesize)
1258 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
1259 if (capture_opts->has_autostop_duration)
1260 cnd_autostop_duration =
1261 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
1263 if (capture_opts->multi_files_on) {
1264 if (capture_opts->has_file_duration)
1266 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
1268 if (capture_opts->has_autostop_files)
1269 cnd_autostop_files =
1270 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
1273 /* start capture info dialog */
1274 if(capture_opts->show_info) {
1275 capture_ui.callback_data = &ld;
1276 capture_ui.counts = &ld.counts;
1277 capture_info_create(&capture_ui, capture_opts->iface);
1280 /* init the time values */
1281 start_time = TIME_GET();
1282 upd_time = TIME_GET();
1285 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture child running!");
1287 /* WOW, everything is prepared! */
1288 /* please fasten your seat belts, we will enter now the actual capture loop */
1290 main_window_update();
1292 /* dispatch incoming packets */
1293 inpkts = capture_loop_dispatch(capture_opts, &ld, errmsg, sizeof(errmsg));
1295 main_window_update();
1298 /* some news from our parent (signal pipe)? -> just stop the capture */
1305 handle = (HANDLE) _get_osfhandle (0);
1306 result = PeekNamedPipe(handle, NULL, 0, NULL, &avail, NULL);
1308 if(!result || avail > 0) {
1310 /*g_warning("loop closing");*/
1316 ld.packets_sync_pipe += inpkts;
1318 /* check capture size condition */
1319 if (cnd_autostop_size != NULL && cnd_eval(cnd_autostop_size,
1320 (guint32)wtap_get_bytes_dumped(ld.wtap_pdh))){
1321 /* Capture size limit reached, do we have another file? */
1322 if (capture_opts->multi_files_on) {
1323 if (cnd_autostop_files != NULL && cnd_eval(cnd_autostop_files, ++autostop_files)) {
1324 /* no files left: stop here */
1329 /* Switch to the next ringbuffer file */
1330 if (ringbuf_switch_file(&ld.wtap_pdh, &capture_opts->save_file, &save_file_fd, &ld.err)) {
1331 /* File switch succeeded: reset the conditions */
1332 cnd_reset(cnd_autostop_size);
1333 if (cnd_file_duration) {
1334 cnd_reset(cnd_file_duration);
1336 wtap_dump_flush(ld.wtap_pdh);
1337 sync_pipe_filename_to_parent(capture_opts->save_file);
1338 ld.packets_sync_pipe = 0;
1340 /* File switch failed: stop here */
1345 /* single file, stop now */
1349 } /* cnd_autostop_size */
1352 /* Only update once a second so as not to overload slow displays */
1353 cur_time = TIME_GET();
1355 if ( (cur_time - upd_time) > 500) {
1357 if (cur_time - upd_time > 0) {
1359 upd_time = cur_time;
1361 /*if (pcap_stats(pch, stats) >= 0) {
1362 *stats_known = TRUE;
1365 /* calculate and display running time */
1366 if(capture_opts->show_info) {
1367 cur_time -= start_time;
1369 capture_ui.running_time = cur_time / 1000;
1371 capture_ui.running_time = cur_time;
1373 capture_ui.new_packets = ld.packets_sync_pipe;
1374 capture_info_update(&capture_ui);
1377 /* Let the parent process know. */
1378 if (ld.packets_sync_pipe) {
1380 wtap_dump_flush(ld.wtap_pdh);
1382 /* Send our parent a message saying we've written out "ld.sync_packets"
1383 packets to the capture file. */
1384 sync_pipe_packet_count_to_parent(ld.packets_sync_pipe);
1386 ld.packets_sync_pipe = 0;
1389 /* check capture duration condition */
1390 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
1391 /* The maximum capture time has elapsed; stop the capture. */
1396 /* check capture file duration condition */
1397 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
1398 /* duration limit reached, do we have another file? */
1399 if (capture_opts->multi_files_on) {
1400 if (cnd_autostop_files != NULL && cnd_eval(cnd_autostop_files, ++autostop_files)) {
1401 /* no files left: stop here */
1406 /* Switch to the next ringbuffer file */
1407 if (ringbuf_switch_file(&ld.wtap_pdh, &capture_opts->save_file, &save_file_fd, &ld.err)) {
1408 /* file switch succeeded: reset the conditions */
1409 cnd_reset(cnd_file_duration);
1410 if(cnd_autostop_size)
1411 cnd_reset(cnd_autostop_size);
1412 wtap_dump_flush(ld.wtap_pdh);
1413 sync_pipe_filename_to_parent(capture_opts->save_file);
1414 ld.packets_sync_pipe = 0;
1416 /* File switch failed: stop here */
1421 /* single file, stop now */
1425 } /* cnd_file_duration */
1428 } /* while (ld.go) */
1430 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture child stopping ...");
1432 /* close capture info dialog */
1433 if(capture_opts->show_info) {
1434 capture_info_destroy(&capture_ui);
1437 /* delete stop conditions */
1438 if (cnd_file_duration != NULL)
1439 cnd_delete(cnd_file_duration);
1440 if (cnd_autostop_files != NULL)
1441 cnd_delete(cnd_autostop_files);
1442 if (cnd_autostop_size != NULL)
1443 cnd_delete(cnd_autostop_size);
1444 if (cnd_autostop_duration != NULL)
1445 cnd_delete(cnd_autostop_duration);
1447 /* did we had a pcap (input) error? */
1449 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
1450 pcap_geterr(ld.pcap_h));
1451 capture_loop_popup_errmsg(capture_opts, errmsg);
1454 else if (ld.from_cap_pipe && ld.cap_pipe_err == PIPERR)
1455 capture_loop_popup_errmsg(capture_opts, errmsg);
1458 /* did we had an error while capturing? */
1462 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, ld.err,
1464 capture_loop_popup_errmsg(capture_opts, errmsg);
1468 /* close the wiretap (output) file */
1469 close_ok = capture_loop_close_output(capture_opts, &ld, &err_close);
1471 /* If we've displayed a message about a write error, there's no point
1472 in displaying another message about an error on close. */
1473 if (!close_ok && write_ok) {
1474 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
1476 capture_loop_popup_errmsg(capture_opts, errmsg);
1480 * XXX We exhibit different behaviour between normal mode and sync mode
1481 * when the pipe is stdin and not already at EOF. If we're a child, the
1482 * parent's stdin isn't closed, so if the user starts another capture,
1483 * cap_pipe_open_live() will very likely not see the expected magic bytes and
1484 * will say "Unrecognized libpcap format". On the other hand, in normal
1485 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
1488 /* get packet drop statistics from pcap */
1489 if(ld.pcap_h != NULL) {
1490 g_assert(!ld.from_cap_pipe);
1491 /* Get the capture statistics, so we know how many packets were
1493 if (pcap_stats(ld.pcap_h, stats) >= 0) {
1494 *stats_known = TRUE;
1495 /* Let the parent process know. */
1496 sync_pipe_drops_to_parent(stats->ps_drop);
1498 g_snprintf(errmsg, sizeof(errmsg),
1499 "Can't get packet-drop statistics: %s",
1500 pcap_geterr(ld.pcap_h));
1501 capture_loop_popup_errmsg(capture_opts, errmsg);
1505 /* close the input file (pcap or capture pipe) */
1506 capture_loop_close_input(&ld);
1508 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture child stopped!");
1510 /* ok, if the write and the close were successful. */
1511 return write_ok && close_ok;
1514 if (capture_opts->multi_files_on) {
1515 /* cleanup ringbuffer */
1516 ringbuf_error_cleanup();
1518 /* We can't use the save file, and we have no wtap_dump stream
1519 to close in order to close it, so close the FD directly. */
1520 close(save_file_fd);
1522 /* We couldn't even start the capture, so get rid of the capture
1524 unlink(capture_opts->save_file); /* silently ignore error */
1525 g_free(capture_opts->save_file);
1527 capture_opts->save_file = NULL;
1528 capture_loop_popup_errmsg(capture_opts, errmsg);
1530 /* close the input file (pcap or cap_pipe) */
1531 capture_loop_close_input(&ld);
1533 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture child stopped with error");
1539 void capture_loop_stop(void)
1546 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
1547 int err, gboolean is_close)
1552 g_snprintf(errmsg, errmsglen,
1553 "Not all the packets could be written to the file"
1554 " to which the capture was being saved\n"
1555 "(\"%s\") because there is no space left on the file system\n"
1556 "on which that file resides.",
1562 g_snprintf(errmsg, errmsglen,
1563 "Not all the packets could be written to the file"
1564 " to which the capture was being saved\n"
1565 "(\"%s\") because you are too close to, or over,"
1566 " your disk quota\n"
1567 "on the file system on which that file resides.",
1572 case WTAP_ERR_CANT_CLOSE:
1573 g_snprintf(errmsg, errmsglen,
1574 "The file to which the capture was being saved"
1575 " couldn't be closed for some unknown reason.");
1578 case WTAP_ERR_SHORT_WRITE:
1579 g_snprintf(errmsg, errmsglen,
1580 "Not all the packets could be written to the file"
1581 " to which the capture was being saved\n"
1588 g_snprintf(errmsg, errmsglen,
1589 "The file to which the capture was being saved\n"
1590 "(\"%s\") could not be closed: %s.",
1591 fname, wtap_strerror(err));
1593 g_snprintf(errmsg, errmsglen,
1594 "An error occurred while writing to the file"
1595 " to which the capture was being saved\n"
1597 fname, wtap_strerror(err));
1604 capture_loop_popup_errmsg(capture_options *capture_opts _U_, const char *errmsg)
1606 /* Send the error message to our parent, so they can display a
1607 dialog box containing it. */
1608 sync_pipe_errmsg_to_parent(errmsg);
1612 /* one packet was captured, process it */
1614 capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
1617 struct wtap_pkthdr whdr;
1618 union wtap_pseudo_header pseudo_header;
1619 loop_data *ld = (loop_data *) user;
1622 /* if the user told us to stop after x packets, do we have enough? */
1624 if ((ld->packets_max > 0) && (ld->counts.total >= ld->packets_max))
1629 /* Convert from libpcap to Wiretap format.
1630 If that fails, set "ld->go" to FALSE, to stop the capture, and set
1631 "ld->err" to the error. */
1632 pd = wtap_process_pcap_packet(ld->wtap_linktype, phdr, pd, &pseudo_header,
1641 /* We're supposed to write the packet to a file; do so.
1642 If this fails, set "ld->go" to FALSE, to stop the capture, and set
1643 "ld->err" to the error. */
1644 if (!wtap_dump(ld->wtap_pdh, &whdr, &pseudo_header, pd, &err)) {
1650 switch (ld->wtap_linktype) {
1651 case WTAP_ENCAP_ETHERNET:
1652 capture_eth(pd, 0, whdr.caplen, &ld->counts);
1654 case WTAP_ENCAP_FDDI:
1655 case WTAP_ENCAP_FDDI_BITSWAPPED:
1656 capture_fddi(pd, whdr.caplen, &ld->counts);
1658 case WTAP_ENCAP_PRISM_HEADER:
1659 capture_prism(pd, 0, whdr.caplen, &ld->counts);
1661 case WTAP_ENCAP_TOKEN_RING:
1662 capture_tr(pd, 0, whdr.caplen, &ld->counts);
1664 case WTAP_ENCAP_NULL:
1665 capture_null(pd, whdr.caplen, &ld->counts);
1667 case WTAP_ENCAP_PPP:
1668 capture_ppp_hdlc(pd, 0, whdr.caplen, &ld->counts);
1670 case WTAP_ENCAP_RAW_IP:
1671 capture_raw(pd, whdr.caplen, &ld->counts);
1673 case WTAP_ENCAP_SLL:
1674 capture_sll(pd, whdr.caplen, &ld->counts);
1676 case WTAP_ENCAP_LINUX_ATM_CLIP:
1677 capture_clip(pd, whdr.caplen, &ld->counts);
1679 case WTAP_ENCAP_IEEE_802_11:
1680 case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
1681 capture_ieee80211(pd, 0, whdr.caplen, &ld->counts);
1683 case WTAP_ENCAP_CHDLC:
1684 capture_chdlc(pd, 0, whdr.caplen, &ld->counts);
1686 case WTAP_ENCAP_LOCALTALK:
1687 capture_llap(&ld->counts);
1689 case WTAP_ENCAP_ATM_PDUS:
1690 capture_atm(&pseudo_header, pd, whdr.caplen, &ld->counts);
1692 case WTAP_ENCAP_IP_OVER_FC:
1693 capture_ipfc(pd, whdr.caplen, &ld->counts);
1695 case WTAP_ENCAP_ARCNET:
1696 capture_arcnet(pd, whdr.caplen, &ld->counts, FALSE, TRUE);
1698 case WTAP_ENCAP_ARCNET_LINUX:
1699 capture_arcnet(pd, whdr.caplen, &ld->counts, TRUE, FALSE);
1701 case WTAP_ENCAP_APPLE_IP_OVER_IEEE1394:
1702 capture_ap1394(pd, 0, whdr.caplen, &ld->counts);
1704 case WTAP_ENCAP_FRELAY:
1705 case WTAP_ENCAP_FRELAY_WITH_PHDR:
1706 capture_fr(pd, 0, whdr.caplen, &ld->counts);
1708 /* XXX - some ATM drivers on FreeBSD might prepend a 4-byte ATM
1709 pseudo-header to DLT_ATM_RFC1483, with LLC header following;
1710 we might have to implement that at some point. */
1714 #endif /* HAVE_LIBPCAP */