#include <string.h>
#include <ctype.h>
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
+
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <signal.h>
+#include <errno.h>
#ifdef NEED_GETOPT_H
#include "getopt.h"
#include "version_info.h"
#include <pcap.h>
+#include "pcapio.h"
+
#include "capture-pcap-util.h"
#ifdef _WIN32
#include "epan/unicode-utils.h"
#endif
-#ifdef HAVE_LIBCAP
#include "epan/privileges.h"
-#endif
#include "sync_pipe.h"
-#include "capture.h"
-#include "capture_loop.h"
+#include "capture_opts.h"
#include "capture_sync.h"
-#include "simple_dialog.h"
-#include "util.h"
+#include "conditions.h"
+#include "capture_stop_conditions.h"
+
+#include "tempfile.h"
#include "log.h"
#include "file_util.h"
+/*
+ * Get information about libpcap format from "wiretap/libpcap.h".
+ * XXX - can we just use pcap_open_offline() to read the pipe?
+ */
+#include "wiretap/libpcap.h"
+
+/**#define DEBUG_DUMPCAP**/
+/**#define DEBUG_CHILD_DUMPCAP**/
-/*#define DEBUG_DUMPCAP*/
+#ifdef DEBUG_CHILD_DUMPCAP
+FILE *debug_log; /* for logging debug messages to */
+ /* a file if DEBUG_CHILD_DUMPCAP */
+ /* is defined */
+#endif
-gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
+static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
#ifdef _WIN32
-gchar *sig_pipe_name = NULL;
-HANDLE sig_pipe_handle = NULL;
+static gchar *sig_pipe_name = NULL;
+static HANDLE sig_pipe_handle = NULL;
#endif
+/** Stop a low-level capture (stops the capture child). */
+static void capture_loop_stop(void);
+
+#if !defined (__linux__)
+#ifndef HAVE_PCAP_BREAKLOOP
+/*
+ * We don't have pcap_breakloop(), which is the only way to ensure that
+ * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
+ * won't, if the call to read the next packet or batch of packets is
+ * is interrupted by a signal on UN*X, just go back and try again to
+ * read again.
+ *
+ * On UN*X, we catch SIGUSR1 as a "stop capturing" signal, and, in
+ * the signal handler, set a flag to stop capturing; however, without
+ * a guarantee of that sort, we can't guarantee that we'll stop capturing
+ * if the read will be retried and won't time out if no packets arrive.
+ *
+ * Therefore, on at least some platforms, we work around the lack of
+ * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
+ * to wait for packets to arrive, so that we're probably going to be
+ * blocked in the select() when the signal arrives, and can just bail
+ * out of the loop at that point.
+ *
+ * However, we don't want to that 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.)
+ *
+ * Fortunately, we don't need to do it on BSD, because the libpcap timeout
+ * on BSD times out even if no packets have arrived, so we'll eventually
+ * exit pcap_dispatch() with an indication that no packets have arrived,
+ * and will break out of the capture loop at that point.
+ *
+ * On Windows, we can't send a SIGUSR1 to stop capturing, so none of this
+ * applies in any case.
+ *
+ * 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.
+ */
+# if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
+ !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
+ !defined(__CYGWIN__)
+# define MUST_DO_SELECT
+# endif /* avoid select */
+#endif /* HAVE_PCAP_BREAKLOOP */
+#else /* linux */
+/* whatever the deal with pcap_breakloop, linux doesn't support timeouts
+ * in pcap_dispatch(); on the other hand, select() works just fine there.
+ * Hence we use a select for that come what may.
+ */
+#define MUST_DO_SELECT
+#endif
+
+/** init the capture filter */
+typedef enum {
+ INITFILTER_NO_ERROR,
+ INITFILTER_BAD_FILTER,
+ INITFILTER_OTHER_ERROR
+} initfilter_status_t;
+
+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 packet_count; /* Number of packets we have already captured */
+ gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
+
+ /* 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 */
+ struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
+ struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
+ 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;
+
+ /* output file */
+ FILE *pdh;
+ int linktype;
+ gint wtap_linktype;
+ long bytes_written;
+
+} loop_data;
+
+/*
+ * Standard secondary message for unexpected errors.
+ */
+static const char please_report[] =
+ "Please report this to the Wireshark developers.\n"
+ "(This is not a crash; please do not report it as such.)";
+
+/*
+ * 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
console_log_handler(const char *log_domain, GLogLevelFlags log_level,
const char *message, gpointer user_data _U_);
/* capture related options */
-capture_options global_capture_opts;
-capture_options *capture_opts = &global_capture_opts;
+static capture_options global_capture_opts;
+static capture_options *capture_opts = &global_capture_opts;
+
+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);
+
#if __GNUC__ >= 2
-void exit_main(int err) __attribute__ ((noreturn));
+static void exit_main(int err) __attribute__ ((noreturn));
#else
-void exit_main(int err);
+static void exit_main(int err);
#endif
+static void report_new_capture_file(const char *filename);
+static void report_packet_count(int packet_count);
+static void report_packet_drops(int drops);
+static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
+static void report_cfilter_error(const char *cfilter, const char *errmsg);
+
+#ifdef _WIN32
+static gboolean signal_pipe_check_running(void);
+#endif
static void
print_usage(gboolean print_ver) {
va_list ap;
if(capture_child) {
- /* Print a bare error */
+ gchar *msg;
+ /* Generate a 'special format' message back to parent */
va_start(ap, fmt);
- vfprintf(stderr, fmt, ap);
+ msg = g_strdup_vprintf(fmt, ap);
+ sync_pipe_errmsg_to_parent(2, msg, "");
+ g_free(msg);
va_end(ap);
} else {
va_start(ap, fmt);
va_list ap;
if(capture_child) {
- /* XXX - convert to g_log */
+ gchar *msg;
+ va_start(ap, fmt);
+ msg = g_strdup_vprintf(fmt, ap);
+ sync_pipe_errmsg_to_parent(2, msg, "");
+ g_free(msg);
+ va_end(ap);
} else {
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
}
#endif
-void exit_main(int status)
+static void exit_main(int status)
{
#ifdef _WIN32
/* Shutdown windows sockets */
/*
* If we were linked with libcap (not libpcap), make sure we have
* CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
+ * (See comment in main() for details)
*/
-void
+static void
#if 0 /* Set to enable capability debugging */
+/* see 'man cap_to_text()' for explanation of output */
+/* '=' means 'all= ' ie: no capabilities */
+/* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
+/* .... */
print_caps(char *pfx) {
cap_t caps = cap_get_proc();
- fprintf(stderr, "%s: EUID: %d Capabilities: %s\n", pfx,
- geteuid(), cap_to_text(caps, NULL));
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
+ "%s: EUID: %d Capabilities: %s", pfx,
+ geteuid(), cap_to_text(caps, NULL));
cap_free(caps);
#else
print_caps(char *pfx _U_) {
#endif
}
-void
+static void
relinquish_privs_except_capture(void)
{
- /* CAP_NET_ADMIN: Promiscuous mode and a truckload of other
+ /* If 'started_with_special_privs' (ie: suid) then enable for
+ * ourself the NET_ADMIN and NET_RAW capabilities and then
+ * drop our suid privileges.
+ *
+ * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
* stuff we don't need (and shouldn't have).
* CAP_NET_RAW: Packet capture (raw sockets).
*/
- cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
- cap_t caps = cap_init();
- int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
if (started_with_special_privs()) {
+ cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
+ int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
+
+ cap_t caps = cap_init(); /* all capabilities initialized to off */
+
print_caps("Pre drop, pre set");
+
if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
- perror("prctl()");
+ cmdarg_err("prctl() fail return: %s", strerror(errno));
}
cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
if (cap_set_proc(caps)) {
- perror("capset()");
+ cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
}
print_caps("Pre drop, post set");
+
+ relinquish_special_privs_perm();
+
+ print_caps("Post drop, pre set");
+ cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
+ if (cap_set_proc(caps)) {
+ cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
+ }
+ print_caps("Post drop, post set");
+
+ cap_free(caps);
}
+}
- relinquish_special_privs_perm();
- print_caps("Post drop, pre set");
- cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
+static void
+relinquish_all_capabilities()
+{
+ /* Drop any and all capabilities this process may have. */
+ /* Allowed whether or not process has any privileges. */
+ cap_t caps = cap_init(); /* all capabilities initialized to off */
+ print_caps("Pre-clear");
if (cap_set_proc(caps)) {
- perror("capset()");
+ cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
}
- print_caps("Post drop, post set");
+ print_caps("Post-clear");
cap_free(caps);
}
+
#endif /* HAVE_LIBCAP */
+/* Take care of byte order in the libpcap headers read from pipes.
+ * (function taken from wiretap/libpcap.c) */
+static void
+cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
+{
+ if (byte_swapped) {
+ /* Byte-swap the record header fields. */
+ rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
+ rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
+ rechdr->incl_len = BSWAP32(rechdr->incl_len);
+ rechdr->orig_len = BSWAP32(rechdr->orig_len);
+ }
+
+ /* In file format version 2.3, the "incl_len" and "orig_len" fields were
+ swapped, in order to match the BPF header layout.
+
+ Unfortunately, some files were, according to a comment in the "libpcap"
+ source, written with version 2.3 in their headers but without the
+ interchanged fields, so if "incl_len" is greater than "orig_len" - which
+ would make no sense - we assume that we need to swap them. */
+ if (hdr->version_major == 2 &&
+ (hdr->version_minor < 3 ||
+ (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
+ guint32 temp;
+
+ temp = rechdr->orig_len;
+ rechdr->orig_len = rechdr->incl_len;
+ rechdr->incl_len = temp;
+ }
+}
+
+/* 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) {
+#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);
+
+ 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 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, CAP_READ_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.
+ * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
+ * because we can't seek on pipes (see wiretap/libpcap.c for details) */
+static int
+cap_pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ld,
+ char *errmsg, int errmsgl)
+{
+#ifndef _WIN32
+ struct stat pipe_stat;
+#else
+#if 1
+ 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;
+
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
+
+ /*
+ * XXX (T)Wireshark blocks until we return
+ */
+ if (strcmp(pipename, "-") == 0) {
+ fd = 0; /* read from stdin */
+#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 {
+ g_snprintf(errmsg, errmsgl,
+ "The capture session could not be initiated "
+ "due to error on pipe: %s", strerror(errno));
+ ld->cap_pipe_err = PIPERR;
+ }
+ return -1;
+ }
+ if (! S_ISFIFO(pipe_stat.st_mode)) {
+ if (S_ISCHR(pipe_stat.st_mode)) {
+ /*
+ * Assume the user specified an interface on a system where
+ * interfaces are in /dev. Pretend we haven't seen it.
+ */
+ ld->cap_pipe_err = PIPNEXIST;
+ } 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;
+ }
+ 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 */
+#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 ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
+ pos = strchr(pncopy + 3, '\\');
+ if (pos && g_ascii_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 named 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;
+ }
+#endif /* _WIN32 */
+ }
+
+ ld->from_cap_pipe = TRUE;
+
+ /* read the pcap header */
+ bytes_read = 0;
+ while (bytes_read < sizeof magic) {
+ sel_ret = cap_pipe_select(fd);
+ if (sel_ret < 0) {
+ g_snprintf(errmsg, errmsgl,
+ "Unexpected error from select: %s", strerror(errno));
+ goto error;
+ } else if (sel_ret > 0) {
+ b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
+ if (b <= 0) {
+ if (b == 0)
+ g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
+ else
+ g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
+ strerror(errno));
+ goto error;
+ }
+ bytes_read += b;
+ }
+ }
+
+ switch (magic) {
+ case PCAP_MAGIC:
+ /* Host that wrote it has our byte order, and was running
+ a program using either standard or ss990417 libpcap. */
+ ld->cap_pipe_byte_swapped = FALSE;
+ ld->cap_pipe_modified = FALSE;
+ break;
+ case PCAP_MODIFIED_MAGIC:
+ /* Host that wrote it has our byte order, but was running
+ a program using either ss990915 or ss991029 libpcap. */
+ ld->cap_pipe_byte_swapped = FALSE;
+ ld->cap_pipe_modified = TRUE;
+ break;
+ case PCAP_SWAPPED_MAGIC:
+ /* Host that wrote it has a byte order opposite to ours,
+ and was running a program using either standard or
+ ss990417 libpcap. */
+ ld->cap_pipe_byte_swapped = TRUE;
+ ld->cap_pipe_modified = FALSE;
+ break;
+ case PCAP_SWAPPED_MODIFIED_MAGIC:
+ /* Host that wrote it out has a byte order opposite to
+ ours, and was running a program using either ss990915
+ or ss991029 libpcap. */
+ ld->cap_pipe_byte_swapped = TRUE;
+ ld->cap_pipe_modified = TRUE;
+ break;
+ default:
+ /* Not a "libpcap" type we know about. */
+ g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
+ goto error;
+ }
+
+ /* Read the rest of the header */
+ bytes_read = 0;
+ while (bytes_read < sizeof(struct pcap_hdr)) {
+ sel_ret = cap_pipe_select(fd);
+ if (sel_ret < 0) {
+ g_snprintf(errmsg, errmsgl,
+ "Unexpected error from select: %s", strerror(errno));
+ goto error;
+ } else if (sel_ret > 0) {
+ b = read(fd, ((char *)hdr)+bytes_read,
+ sizeof(struct pcap_hdr) - bytes_read);
+ if (b <= 0) {
+ if (b == 0)
+ g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
+ else
+ g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
+ strerror(errno));
+ goto error;
+ }
+ bytes_read += b;
+ }
+ }
+
+ if (ld->cap_pipe_byte_swapped) {
+ /* Byte-swap the header fields about which we care. */
+ hdr->version_major = BSWAP16(hdr->version_major);
+ hdr->version_minor = BSWAP16(hdr->version_minor);
+ 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");
+ goto error;
+ }
+
+ ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
+ ld->cap_pipe_err = PIPOK;
+ 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;
+ 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(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:
+ ld->cap_pipe_bytes_to_read = ld->cap_pipe_modified ?
+ sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
+ ld->cap_pipe_bytes_read = 0;
+ ld->cap_pipe_state = STATE_READ_REC_HDR;
+ /* Fall through */
+
+ case STATE_READ_REC_HDR:
+ 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;
+ else
+ result = PD_PIPE_ERR;
+ break;
+ }
+ if ((ld->cap_pipe_bytes_read += b) < ld->cap_pipe_bytes_to_read)
+ return 0;
+ result = PD_REC_HDR_READ;
+ break;
+
+ case STATE_EXPECT_DATA:
+ ld->cap_pipe_bytes_read = 0;
+ ld->cap_pipe_state = STATE_READ_DATA;
+ /* Fall through */
+
+ case STATE_READ_DATA:
+ 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;
+ else
+ result = PD_PIPE_ERR;
+ break;
+ }
+ if ((ld->cap_pipe_bytes_read += b) < ld->cap_pipe_rechdr.hdr.incl_len)
+ return 0;
+ result = PD_DATA_READ;
+ break;
+
+ default:
+ g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
+ result = PD_ERR;
+
+ } /* switch (ld->cap_pipe_state) */
+
+ /*
+ * We've now read as much data as we were expecting, so process it.
+ */
+ switch (result) {
+
+ case PD_REC_HDR_READ:
+ /* We've read the header. Take care of byte order. */
+ 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, ld->cap_pipe_rechdr.hdr.incl_len);
+ break;
+ }
+ ld->cap_pipe_state = STATE_EXPECT_DATA;
+ return 0;
+
+ case PD_DATA_READ:
+ /* Fill in a "struct pcap_pkthdr", and process the packet. */
+ 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((u_char *)ld, &phdr, data);
+
+ ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
+ return 1;
+
+ case PD_PIPE_EOF:
+ ld->cap_pipe_err = PIPEOF;
+ return -1;
+
+ case PD_PIPE_ERR:
+ g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
+ strerror(errno));
+ /* Fall through */
+ case PD_ERR:
+ break;
+ }
+
+ ld->cap_pipe_err = PIPERR;
+ /* Return here rather than inside the switch to prevent GCC warning */
+ return -1;
+}
+
+
+/** Open the capture input file (pcap or capture pipe).
+ * Returns TRUE if it succeeds, FALSE otherwise. */
+static 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;
+#endif
+#ifdef HAVE_PCAP_REMOTE
+ struct pcap_rmtauth auth;
+#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
+ /* XXX - do we really require 1.1 or earlier?
+ Are there any versions that support only 2.0 or higher? */
+ wVersionRequested = MAKEWORD(1, 1);
+ err = WSAStartup(wVersionRequested, &wsaData);
+ if (err != 0) {
+ switch (err) {
+
+ case WSASYSNOTREADY:
+ g_snprintf(errmsg, errmsg_len,
+ "Couldn't initialize Windows Sockets: Network system not ready for network communication");
+ break;
+
+ case WSAVERNOTSUPPORTED:
+ g_snprintf(errmsg, errmsg_len,
+ "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
+ LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
+ break;
+
+ case WSAEINPROGRESS:
+ g_snprintf(errmsg, errmsg_len,
+ "Couldn't initialize Windows Sockets: Blocking operation is in progress");
+ break;
+
+ case WSAEPROCLIM:
+ g_snprintf(errmsg, errmsg_len,
+ "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
+ break;
+
+ case WSAEFAULT:
+ g_snprintf(errmsg, errmsg_len,
+ "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
+ break;
+
+ default:
+ g_snprintf(errmsg, errmsg_len,
+ "Couldn't initialize Windows Sockets: error %d", err);
+ break;
+ }
+ g_snprintf(secondary_errmsg, secondary_errmsg_len, please_report);
+ return FALSE;
+ }
+#endif
+
+ /* Open the network interface to capture from it.
+ Some versions of libpcap may put warnings into the error buffer
+ if they succeed; to tell if that's happened, we have to clear
+ the error buffer, and check if it's still a null string. */
+ open_err_str[0] = '\0';
+#ifdef HAVE_PCAP_OPEN
+ auth.type = capture_opts->auth_type == CAPTURE_AUTH_PWD ?
+ RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
+ auth.username = capture_opts->auth_username;
+ auth.password = capture_opts->auth_password;
+
+ ld->pcap_h = pcap_open(capture_opts->iface,
+ capture_opts->has_snaplen ? capture_opts->snaplen :
+ WTAP_MAX_PACKET_SIZE,
+ /* flags */
+ (capture_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
+ (capture_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
+ (capture_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
+ CAP_READ_TIMEOUT, &auth, open_err_str);
+#else
+ ld->pcap_h = pcap_open_live(capture_opts->iface,
+ capture_opts->has_snaplen ? capture_opts->snaplen :
+ WTAP_MAX_PACKET_SIZE,
+ capture_opts->promisc_mode, CAP_READ_TIMEOUT,
+ open_err_str);
+#endif
+
+/* If not using libcap: we now can now set euid/egid to ruid/rgid */
+/* to remove any suid privileges. */
+/* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
+/* (euid/egid have already previously been set to ruid/rgid. */
+/* (See comment in main() for details) */
+#ifndef HAVE_LIBCAP
+ relinquish_special_privs_perm();
+#else
+ relinquish_all_capabilities();
+#endif
+
+ if (ld->pcap_h != NULL) {
+ /* we've opened "iface" as a network device */
+#ifdef _WIN32
+ /* try to set the capture buffer size */
+ if (pcap_setbuff(ld->pcap_h, capture_opts->buffer_size * 1024 * 1024) != 0) {
+ 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",
+ 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
+
+#if defined(HAVE_PCAP_REMOTE) && defined(HAVE_PCAP_SETSAMPLING)
+ if (capture_opts->sampling_method != CAPTURE_SAMP_NONE)
+ {
+ struct pcap_samp *samp;
+
+ if ((samp = pcap_setsampling(ld->pcap_h)) != NULL)
+ {
+ switch (capture_opts->sampling_method)
+ {
+ case CAPTURE_SAMP_BY_COUNT:
+ samp->method = PCAP_SAMP_1_EVERY_N;
+ break;
+
+ case CAPTURE_SAMP_BY_TIMER:
+ samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
+ break;
+
+ default:
+ sync_msg_str = g_strdup_printf(
+ "Unknown sampling method %d specified,\n"
+ "continue without packet sampling",
+ capture_opts->sampling_method);
+ report_capture_error("Couldn't set the capture "
+ "sampling", sync_msg_str);
+ g_free(sync_msg_str);
+ }
+ samp->value = capture_opts->sampling_param;
+ }
+ else
+ {
+ report_capture_error("Couldn't set the capture sampling",
+ "Cannot get packet sampling data structure");
+ }
+
+ }
+#endif
+
+ /* setting the data link type only works on real interfaces */
+ if (capture_opts->linktype != -1) {
+ set_linktype_err_str = set_pcap_linktype(ld->pcap_h, capture_opts->iface,
+ 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);
+ 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. */
+ /* 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 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 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)Wireshark with a version of the libpcap library\n"
+ "that doesn't handle HP-UX network devices well; this means that\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"
+ "packaged binary form from the Software Porting And Archive Centre\n"
+ "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
+ "at the URL lists a number of mirror sites.";
+ else
+ 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 "
+"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
+ * filled in errmsg
+ */
+ return FALSE;
+ } else
+ /* cap_pipe_open_live() succeeded; don't want
+ error message from pcap_open_live() */
+ open_err_str[0] = '\0';
+ }
+
+/* XXX - will this work for tshark? */
+#ifdef MUST_DO_SELECT
+ 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') {
+ sync_msg_str = g_strdup_printf("%s.", open_err_str);
+ report_capture_error(sync_msg_str, "");
+ g_free(sync_msg_str);
+ }
+
+ return TRUE;
+}
+
+
+/* close the capture input file (pcap or capture pipe) */
+static void capture_loop_close_input(loop_data *ld) {
+
+ 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);
+ eth_close(ld->cap_pipe_fd);
+ ld->cap_pipe_fd = 0;
+ }
+
+ /* 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();
+#endif
+}
+
+
+/* init the capture filter */
+static initfilter_status_t
+capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe, 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 && !from_cap_pipe) {
+ /* A capture filter was specified; set it up. */
+ if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
+ /*
+ * Well, we can't get the netmask for this interface; it's used
+ * only for filters that check for broadcast IP addresses, so
+ * we just punt and use 0. It might be nice to warn the user,
+ * but that's a pain in a GUI application, as it'd involve popping
+ * up a message box, and it's not clear how often this would make
+ * 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(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(pcap_h, &fcode) < 0) {
+#ifdef HAVE_PCAP_FREECODE
+ pcap_freecode(&fcode);
+#endif
+ return INITFILTER_OTHER_ERROR;
+ }
+#ifdef HAVE_PCAP_FREECODE
+ pcap_freecode(&fcode);
+#endif
+ }
+
+ return INITFILTER_NO_ERROR;
+}
+
+
+/* set up to write to the already-opened capture output file/files */
+static 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;
+
+
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
+
+ /* get snaplen */
+ if (ld->from_cap_pipe) {
+ file_snaplen = ld->cap_pipe_hdr.snaplen;
+ } else
+ {
+ file_snaplen = pcap_snapshot(ld->pcap_h);
+ }
+
+ /* Set up to write to the capture file. */
+ if (capture_opts->multi_files_on) {
+ 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 tshark instead? */
+ switch (err) {
+
+ case WTAP_ERR_CANT_OPEN:
+ g_snprintf(errmsg, errmsg_len, "The file to which the capture would be saved"
+ " couldn't be created for some unknown reason.");
+ break;
+
+ case WTAP_ERR_SHORT_WRITE:
+ g_snprintf(errmsg, errmsg_len, "A full header couldn't be written to the file"
+ " to which the capture would be saved.");
+ break;
+
+ default:
+ if (err < 0) {
+ g_snprintf(errmsg, errmsg_len,
+ "The file to which the capture would be"
+ " saved (\"%s\") could not be opened: Error %d.",
+ capture_opts->save_file, err);
+ } else {
+ g_snprintf(errmsg, errmsg_len,
+ "The file to which the capture would be"
+ " saved (\"%s\") could not be opened: %s.",
+ capture_opts->save_file, strerror(err));
+ }
+ break;
+ }
+
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static 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_libpcap_dump_close(&capture_opts->save_file, err_close);
+ } else {
+ return libpcap_dump_close(ld->pdh, err_close);
+ }
+}
+
+/* dispatch incoming packets (pcap or capture pipe)
+ *
+ * Waits for incoming packets to be available, and calls pcap_dispatch()
+ * to cause them to be processed.
+ *
+ * Returns the number of packets which were processed.
+ *
+ * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
+ * packet-batching behaviour does not cause packets to get held back
+ * indefinitely.
+ */
+static int
+capture_loop_dispatch(capture_options *capture_opts _U_, loop_data *ld,
+ char *errmsg, int errmsg_len)
+{
+ int inpkts;
+ int sel_ret;
+ gint packet_count_before;
+ guchar pcap_data[WTAP_MAX_PACKET_SIZE];
+
+ packet_count_before = ld->packet_count;
+ 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");
+#endif
+ sel_ret = cap_pipe_select(ld->cap_pipe_fd);
+ 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);
+ 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, capture_loop_packet_cb,
+ (u_char *)ld);
+ if (inpkts < 0) {
+ ld->pcap_err = TRUE;
+ ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
+ }
+ } else {
+ 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
+#endif /* 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
+ /*
+ * 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, capture_loop_packet_cb, (u_char *) ld);
+#else
+ inpkts = pcap_dispatch(ld->pcap_h, -1, capture_loop_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.
+ *
+ * For reference, an example remote interface:
+ * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
+ */
+
+ /* emulate dispatch from pcap */
+ {
+ int in;
+ struct pcap_pkthdr *pkt_header;
+ u_char *pkt_data;
+
+ in = 0;
+ while(ld->go &&
+ (in = pcap_next_ex(ld->pcap_h, &pkt_header, &pkt_data)) == 1)
+ capture_loop_packet_cb( (u_char *) ld, pkt_header, pkt_data);
+
+ if(in < 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 ld->packet_count - packet_count_before;
+}
+
+
+/* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
+/* Returns TRUE if the file opened successfully, FALSE otherwise. */
+static 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 (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
+ if (capture_opts->multi_files_on) {
+ /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
+ g_snprintf(errmsg, errmsg_len,
+ "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
+ g_free(capfile_name);
+ return FALSE;
+ }
+ if (strcmp(capfile_name, "-") == 0) {
+ /* write to stdout */
+ *save_file_fd = 1;
+#ifdef _WIN32
+ /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
+ _setmode(1, O_BINARY);
+#endif
+ }
+ } /* if (...output_to_pipe ... */
+
+ 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 = eth_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
+ 0600);
+ }
+ }
+ 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;
+ }
+
+ /* 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)". */
+#ifndef _WIN32
+ fchown(*save_file_fd, capture_opts->owner, capture_opts->group);
+#endif
+
+ return TRUE;
+}
+
+
+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. */
+static gboolean
+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;
+ 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;
+ condition *cnd_autostop_duration = NULL;
+ guint32 autostop_files = 0;
+ gboolean write_ok;
+ gboolean close_ok;
+ 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;
+
+ *errmsg = '\0';
+ *secondary_errmsg = '\0';
+
+ /* init the loop data */
+ ld.go = TRUE;
+ ld.packet_count = 0;
+ if (capture_opts->has_autostop_packets)
+ ld.packet_max = capture_opts->autostop_packets;
+ else
+ 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.pdh = NULL;
+ ld.cap_pipe_fd = -1;
+#ifdef MUST_DO_SELECT
+ ld.pcap_fd = 0;
+#endif
+
+ /* 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),
+ secondary_errmsg, sizeof(secondary_errmsg))) {
+ goto error;
+ }
+
+ /* init the input filter from the network interface (capture pipe will do nothing) */
+ 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));
+ goto error;
+
+ 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))) {
+ 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))) {
+ 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. */
+
+ /* 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);
+ report_new_capture_file(capture_opts->save_file);
+ }
+
+ /* initialize capture stop (and alike) conditions */
+ init_capture_stop_conditions();
+ /* create stop conditions */
+ if (capture_opts->has_autostop_filesize)
+ cnd_autostop_size =
+ 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);
+
+ if (capture_opts->multi_files_on) {
+ if (capture_opts->has_file_duration)
+ cnd_file_duration =
+ cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
+
+ if (capture_opts->has_autostop_files)
+ cnd_autostop_files =
+ cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
+ }
+
+ /* init the time values */
+ 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) {
+ /* 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) {
+ inpkts_to_sync_pipe += inpkts;
+
+ /* check capture size condition */
+ 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 */
+ ld.go = FALSE;
+ continue;
+ }
+
+ /* Switch to the next ringbuffer file */
+ 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;
+ }
+ } else {
+ /* single file, stop now */
+ 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 (Win32: 500ms) so as not to overload slow
+ * displays. This also prevents too much context-switching between the
+ * dumpcap and wireshark processes */
+ 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;
+ }*/
+
+ /* Let the parent process know. */
+ if (inpkts_to_sync_pipe) {
+ /* do sync here */
+ libpcap_dump_flush(ld.pdh, NULL);
+
+ /* 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);
+
+ inpkts_to_sync_pipe = 0;
+ }
+
+ /* check capture duration condition */
+ if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
+ /* The maximum capture time has elapsed; stop the capture. */
+ 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)) {
+ /* 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.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;
+ continue;
+ }
+ } else {
+ /* single file, stop now */
+ ld.go = FALSE;
+ continue;
+ }
+ } /* cnd_file_duration */
+ }
+
+ } /* while (ld.go) */
+
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
+
+ /* delete stop conditions */
+ if (cnd_file_duration != NULL)
+ cnd_delete(cnd_file_duration);
+ if (cnd_autostop_files != NULL)
+ cnd_delete(cnd_autostop_files);
+ if (cnd_autostop_size != NULL)
+ cnd_delete(cnd_autostop_size);
+ if (cnd_autostop_duration != NULL)
+ cnd_delete(cnd_autostop_duration);
+
+ /* did we had a pcap (input) error? */
+ if (ld.pcap_err) {
+ /* On Linux, if an interface goes down while you're capturing on it,
+ you'll get a "recvfrom: Network is down" error (ENETDOWN).
+ (At least you will if strerror() doesn't show a local translation
+ of the error.)
+
+ On FreeBSD and OS X, if a network adapter disappears while
+ you're capturing on it, you'll get a "read: Device not configured"
+ error (ENXIO). (See previous parenthetical note.)
+
+ On OpenBSD, you get "read: I/O error" (EIO) in the same case.
+
+ These should *not* be reported to the Wireshark developers. */
+ char *cap_err_str;
+
+ cap_err_str = pcap_geterr(ld.pcap_h);
+ if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
+ strcmp(cap_err_str, "read: Device not configured") == 0 ||
+ strcmp(cap_err_str, "read: I/O error") == 0) {
+ report_capture_error("The network adapter on which the capture was being done "
+ "is no longer running; the capture has stopped.",
+ "");
+ } else {
+ g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
+ cap_err_str);
+ report_capture_error(errmsg, please_report);
+ }
+ }
+ else if (ld.from_cap_pipe && ld.cap_pipe_err == PIPERR)
+ report_capture_error(errmsg, "");
+
+ /* did we had an error while capturing? */
+ if (ld.err == 0) {
+ write_ok = TRUE;
+ } else {
+ capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, ld.err,
+ FALSE);
+ report_capture_error(errmsg, please_report);
+ write_ok = FALSE;
+ }
+
+ 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);
+ report_capture_error(errmsg, "");
+ }
+
+ /*
+ * XXX We exhibit different behaviour between normal mode and sync mode
+ * when the pipe is stdin and not already at EOF. If we're a child, the
+ * parent's stdin isn't closed, so if the user starts another capture,
+ * cap_pipe_open_live() will very likely not see the expected magic bytes and
+ * will say "Unrecognized libpcap format". On the other hand, in normal
+ * mode, cap_pipe_open_live() will say "End of file on pipe during open".
+ */
+
+ /* get packet drop statistics from pcap */
+ if(ld.pcap_h != NULL) {
+ g_assert(!ld.from_cap_pipe);
+ /* Get the capture statistics, so we know how many packets were
+ dropped. */
+ if (pcap_stats(ld.pcap_h, stats) >= 0) {
+ *stats_known = TRUE;
+ /* 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));
+ 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;
+
+error:
+ if (capture_opts->multi_files_on) {
+ /* cleanup ringbuffer */
+ ringbuf_error_cleanup();
+ } else {
+ /* 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. */
+ if(save_file_fd != -1) {
+ eth_close(save_file_fd);
+ }
+
+ /* We couldn't even start the capture, so get rid of the capture
+ file. */
+ if(capture_opts->save_file != NULL) {
+ eth_unlink(capture_opts->save_file);
+ g_free(capture_opts->save_file);
+ }
+ }
+ capture_opts->save_file = NULL;
+ 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;
+}
+
+
+static void capture_loop_stop(void)
+{
+#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,
+ int err, gboolean is_close)
+{
+ switch (err) {
+
+ case ENOSPC:
+ g_snprintf(errmsg, errmsglen,
+ "Not all the packets could be written to the file"
+ " to which the capture was being saved\n"
+ "(\"%s\") because there is no space left on the file system\n"
+ "on which that file resides.",
+ fname);
+ break;
+
+#ifdef EDQUOT
+ case EDQUOT:
+ g_snprintf(errmsg, errmsglen,
+ "Not all the packets could be written to the file"
+ " to which the capture was being saved\n"
+ "(\"%s\") because you are too close to, or over,"
+ " your disk quota\n"
+ "on the file system on which that file resides.",
+ fname);
+ break;
+#endif
+
+ case WTAP_ERR_CANT_CLOSE:
+ g_snprintf(errmsg, errmsglen,
+ "The file to which the capture was being saved"
+ " couldn't be closed for some unknown reason.");
+ break;
+
+ case WTAP_ERR_SHORT_WRITE:
+ g_snprintf(errmsg, errmsglen,
+ "Not all the packets could be written to the file"
+ " to which the capture was being saved\n"
+ "(\"%s\").",
+ fname);
+ break;
+
+ default:
+ if (is_close) {
+ g_snprintf(errmsg, errmsglen,
+ "The file to which the capture was being saved\n"
+ "(\"%s\") could not be closed: %s.",
+ fname, wtap_strerror(err));
+ } else {
+ g_snprintf(errmsg, errmsglen,
+ "An error occurred while writing to the file"
+ " to which the capture was being saved\n"
+ "(\"%s\"): %s.",
+ fname, wtap_strerror(err));
+ }
+ break;
+ }
+}
+
+
+/* one packet was captured, process it */
+static void
+capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
+ const u_char *pd)
+{
+ loop_data *ld = (void *) user;
+ int err;
+
+ /* if the user told us to stop after x packets, do we already have enough? */
+ if ((ld->packet_max > 0) && (ld->packet_count >= ld->packet_max))
+ {
+ ld->go = FALSE;
+ return;
+ }
+
+ /* We may be called multiple times from pcap_dispatch(); if we've set
+ the "stop capturing" flag, ignore this packet, as we're not
+ supposed to be saving any more packets. */
+ if (!ld->go)
+ return;
+
+ 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 (!libpcap_write_packet(ld->pdh, phdr, pd, &ld->bytes_written, &err)) {
+ ld->go = FALSE;
+ ld->err = err;
+ } else
+ ld->packet_count++;
+ }
+}
+
/* And now our feature presentation... [ fade to music ] */
int
gboolean machine_readable = FALSE;
gboolean print_statistics = FALSE;
int status, run_once_args = 0;
+ gint i;
#ifdef HAVE_PCAP_REMOTE
#define OPTSTRING_INIT "a:A:b:c:Df:hi:Lm:MprSs:uvw:y:Z:"
char optstring[sizeof(OPTSTRING_INIT) + sizeof(OPTSTRING_WIN32) - 1] =
OPTSTRING_INIT OPTSTRING_WIN32;
+#ifdef DEBUG_CHILD_DUMPCAP
+ if ((debug_log = fopen("dumpcap_debug_log.tmp","w")) == NULL) {
+ fprintf (stderr, "Unable to open debug log file !\n");
+ exit (1);
+ }
+#endif
+
+ /* Determine if dumpcap is being requested to run in a special */
+ /* capture_child mode by going thru the command line args to see if */
+ /* a -Z is present. (-Z is a hidden option). */
+ /* The primary result of running in capture_child mode is that */
+ /* all messages sent out on stderr are in a special type/len/string */
+ /* format to allow message processing by type. */
+ /* These messages include various 'status' messages which are sent */
+ /* when an actual capture is in progress. Capture_child mode */
+ /* would normally be requested by a parent process which invokes */
+ /* dumpcap and obtains dumpcap stderr output via a pipe to which */
+ /* dumpcap stderr has been redirected. */
+ /* Capture_child mode needs to be determined immediately upon */
+ /* startup so that any messages generated by dumpcap in this mode */
+ /* (eg: during initialization) will be formatted properly. */
+
+ for (i=1; i<argc; i++) {
+ if (strcmp("-Z", argv[i]) == 0) {
+ capture_child = TRUE;
+#ifdef _WIN32
+ /* set output pipe to binary mode, to avoid ugly text conversions */
+ _setmode(2, O_BINARY);
+#endif
+ }
+ }
+
+ /* The default_log_handler will use stdout, which makes trouble in */
+ /* capture child mode, as it uses stdout for it's sync_pipe. */
+ /* So: the filtering is done in the console_log_handler and not here.*/
+ /* We set the log handlers right up front to make sure that any log */
+ /* messages when running as child will be sent back to the parent */
+ /* with the correct format. */
+
+ log_flags =
+ G_LOG_LEVEL_ERROR|
+ G_LOG_LEVEL_CRITICAL|
+ G_LOG_LEVEL_WARNING|
+ G_LOG_LEVEL_MESSAGE|
+ G_LOG_LEVEL_INFO|
+ G_LOG_LEVEL_DEBUG|
+ G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
+
+ g_log_set_handler(NULL,
+ log_flags,
+ console_log_handler, NULL /* user_data */);
+ g_log_set_handler(LOG_DOMAIN_MAIN,
+ log_flags,
+ console_log_handler, NULL /* user_data */);
+ g_log_set_handler(LOG_DOMAIN_CAPTURE,
+ log_flags,
+ console_log_handler, NULL /* user_data */);
+ g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
+ log_flags,
+ console_log_handler, NULL /* user_data */);
+
#ifdef _WIN32
/* Load wpcap if possible. Do this before collecting the run-time version information */
load_wpcap();
sigaction(SIGHUP, &action, NULL);
#endif /* _WIN32 */
-#ifdef HAVE_LIBCAP
+ /* ----------------------------------------------------------------- */
+ /* Privilege and capability handling */
+ /* Cases: */
+ /* 1. Running not as root or suid root; no special capabilities. */
+ /* Action: none */
+ /* */
+ /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
+ /* Action: none */
+ /* */
+ /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
+ /* Action: */
+ /* - Near start of program: Enable NET_RAW and NET_ADMIN */
+ /* capabilities; Drop all other capabilities; */
+ /* - If not -w (ie: doing -S or -D, etc) run to completion; */
+ /* else: after pcap_open_live() in capture_loop_open_input() */
+ /* drop all capabilities (NET_RAW and NET_ADMIN); */
+ /* (Note: this means that the process, although logged in */
+ /* as root, does not have various permissions such as the */
+ /* ability to bypass file access permissions). */
+ /* XXX: Should we just leave capabilities alone in this case */
+ /* so that user gets expected effect that root can do */
+ /* anything ?? */
+ /* */
+ /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
+ /* Action: */
+ /* - If not -w (ie: doing -S or -D, etc) run to completion; */
+ /* else: after pcap_open_live() in capture_loop_open_input() */
+ /* drop suid root (set euid=ruid).(ie: keep suid until after */
+ /* pcap_open_live). */
+ /* */
+ /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
+ /* Action: */
+ /* - Near start of program: Enable NET_RAW and NET_ADMIN */
+ /* capabilities; Drop all other capabilities; */
+ /* Drop suid privileges (euid=ruid); */
+ /* - If not -w (ie: doing -S or -D, etc) run to completion; */
+ /* else: after pcap_open_live() in capture_loop_open_input() */
+ /* drop all capabilities (NET_RAW and NET_ADMIN). */
+ /* */
+ /* XXX: For some Linux versions/distros with capabilities */
+ /* a 'normal' process with any capabilities cannot be */
+ /* 'killed' (signaled) from another (same uid) non-privileged */
+ /* process. */
+ /* For example: If (non-suid) Wireshark forks a */
+ /* child suid dumpcap which acts as described here (case 5), */
+ /* Wireshark will be unable to kill (signal) the child */
+ /* dumpcap process until the capabilities have been dropped */
+ /* (after pcap_open_live()). */
+ /* This behaviour will apparently be changed in the kernel */
+ /* to allow the kill (signal) in this case. */
+ /* See the following for details: */
+ /* http://www.mail-archive.com/ [wrapped] */
+ /* linux-security-module@vger.kernel.org/msg02913.html */
+ /* */
+ /* It is therefore conceivable that if dumpcap somehow hangs */
+ /* in pcap_open_live or before that wireshark will not */
+ /* be able to stop dumpcap using a signal (USR1, TERM, etc). */
+ /* In this case, exiting wireshark will kill the child */
+ /* dumpcap process. */
+ /* */
+ /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
+ /* capabilities; Using libcap. Note: capset cmd (which see) */
+ /* used to assign capabilities to file. */
+ /* Action: */
+ /* - If not -w (ie: doing -S or -D, etc) run to completion; */
+ /* else: after pcap_open_live() in capture_loop_open_input() */
+ /* drop all capabilities (NET_RAW and NET_ADMIN) */
+ /* */
+ /* ToDo: -S (stats) should drop privileges/capabilities when no */
+ /* longer required (similar to capture). */
+ /* */
+ /* ----------------------------------------------------------------- */
+
get_credential_info();
+
+#ifdef HAVE_LIBCAP
+ /* If 'started with special privileges' (and using libcap) */
+ /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
+ /* Set euid/egid = ruid/rgid to remove suid privileges */
relinquish_privs_except_capture();
#endif
- /* the default_log_handler will use stdout, which makes trouble in */
- /* capture child mode, as it uses stdout for it's sync_pipe */
- /* so do the filtering in the console_log_handler and not here */
- log_flags =
- G_LOG_LEVEL_ERROR|
- G_LOG_LEVEL_CRITICAL|
- G_LOG_LEVEL_WARNING|
- G_LOG_LEVEL_MESSAGE|
- G_LOG_LEVEL_INFO|
- G_LOG_LEVEL_DEBUG|
- G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
-
- g_log_set_handler(NULL,
- log_flags,
- console_log_handler, NULL /* user_data */);
- g_log_set_handler(LOG_DOMAIN_MAIN,
- log_flags,
- console_log_handler, NULL /* user_data */);
- g_log_set_handler(LOG_DOMAIN_CAPTURE,
- log_flags,
- console_log_handler, NULL /* user_data */);
- g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
- log_flags,
- console_log_handler, NULL /* user_data */);
-
/* Set the initial values in the capture_opts. This might be overwritten
by the command line parameters. */
capture_opts_init(capture_opts, NULL);
#endif /* _WIN32 */
status = capture_opts_add_opt(capture_opts, opt, optarg, &start_capture);
if(status != 0) {
- exit_main(status);
+ exit_main(status);
}
break;
/*** hidden option: Wireshark child mode (using binary output messages) ***/
case 'Z':
- capture_child = TRUE;
+ capture_child = TRUE;
#ifdef _WIN32
- /* set output pipe to binary mode, to avoid ugly text conversions */
- _setmode(2, O_BINARY);
- /*
- * optarg = the control ID, aka the PPID, currently used for the
- * signal pipe name.
- */
- if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
- sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT,
- optarg);
- sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
- GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
-
- if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
- g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
- "Signal pipe: Unable to open %s. Dead parent?",
- sig_pipe_name);
- exit_main(1);
- }
+ /* set output pipe to binary mode, to avoid ugly text conversions */
+ _setmode(2, O_BINARY);
+ /*
+ * optarg = the control ID, aka the PPID, currently used for the
+ * signal pipe name.
+ */
+ if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
+ sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
+ sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
+ GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
+
+ if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
+ g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
+ "Signal pipe: Unable to open %s. Dead parent?",
+ sig_pipe_name);
+ exit_main(1);
}
+ }
#endif
- break;
+ break;
/*** all non capture option specific ***/
case 'D': /* Print a list of capture devices and exit */
argc -= optind;
argv += optind;
if (argc >= 1) {
- /* user specified file name as regular command-line argument */
- /* XXX - use it as the capture file name (or something else)? */
+ /* user specified file name as regular command-line argument */
+ /* XXX - use it as the capture file name (or something else)? */
argc--;
argv++;
}
}
if (capture_opts_trim_iface(capture_opts, NULL) == FALSE) {
- cmdarg_err("No capture interfaces available (maybe lack of privileges?).");
+ /* cmdarg_err() already called .... */
exit_main(1);
}
/* Now start the capture. */
if(capture_loop_start(capture_opts, &stats_known, &stats) == TRUE) {
- /* capture ok */
- exit_main(0);
+ /* capture ok */
+ exit_main(0);
} else {
- /* capture failed */
- exit_main(1);
+ /* capture failed */
+ exit_main(1);
}
}
const char *message, gpointer user_data _U_)
{
time_t curr;
- struct tm *today;
+ struct tm *today;
const char *level;
-
+ gchar *msg;
/* ignore log message, if log_level isn't interesting */
if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
-#ifndef DEBUG_DUMPCAP
+#if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
return;
#endif
}
g_assert_not_reached();
}
- /* don't use printf (stdout), in child mode we're using stdout for the sync_pipe */
+ /* Generate the output message */
if(log_level & G_LOG_LEVEL_MESSAGE) {
/* normal user messages without additional infos */
- fprintf(stderr, "%s\n", message);
- fflush(stderr);
+ msg = g_strdup_printf("%s\n", message);
} else {
/* info/debug messages with additional infos */
- fprintf(stderr, "%02u:%02u:%02u %8s %s %s\n",
+ msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
today->tm_hour, today->tm_min, today->tm_sec,
log_domain != NULL ? log_domain : "",
level, message);
+ }
+
+ /* DEBUG & INFO msgs (if we're debugging today) */
+#if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
+ if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
+#ifdef DEBUG_DUMPCAP
+ fprintf(stderr, "%s", msg);
+ fflush(stderr);
+#endif
+#ifdef DEBUG_CHILD_DUMPCAP
+ fprintf(debug_log, "%s", msg);
+ fflush(debug_log);
+#endif
+ g_free(msg);
+ return;
+ }
+#endif
+
+ /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
+ /* to parent especially formatted if dumpcap running as child. */
+ if (capture_child) {
+ sync_pipe_errmsg_to_parent(2, msg, "");
+ } else {
+ fprintf(stderr, "%s", msg);
fflush(stderr);
}
+ g_free(msg);
}
#ifdef _WIN32
-gboolean
+static gboolean
signal_pipe_check_running(void)
{
/* any news from our parent? -> just stop the capture */
git.samba.org / obnox / wireshark / wip.git / blobdiff