/builds/wireshark/wireshark/capture/capture

Bug Summary

File:	capture/capture_sync.c
Warning:	line 961, column 9 Potential leak of memory pointed to by 'argv'
Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name capture_sync.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -fno-delete-null-pointer-checks -mframe-pointer=all -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -ffloat16-excess-precision=fast -fbfloat16-excess-precision=fast -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/builds/wireshark/wireshark/build -fcoverage-compilation-dir=/builds/wireshark/wireshark/build -resource-dir /usr/lib/llvm-20/lib/clang/20 -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -D G_DISABLE_DEPRECATED -D G_DISABLE_SINGLE_INCLUDES -D WS_DEBUG -D WS_DEBUG_UTF_8 -I /builds/wireshark/wireshark/build -I /builds/wireshark/wireshark -I /builds/wireshark/wireshark/include -D _GLIBCXX_ASSERTIONS -internal-isystem /usr/lib/llvm-20/lib/clang/20/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/builds/wireshark/wireshark/= -fmacro-prefix-map=/builds/wireshark/wireshark/build/= -fmacro-prefix-map=../= -Wno-format-truncation -Wno-format-nonliteral -Wno-pointer-sign -std=gnu11 -ferror-limit 19 -fvisibility=hidden -fwrapv -fwrapv-pointer -fstrict-flex-arrays=3 -stack-protector 2 -fstack-clash-protection -fcf-protection=full -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fexceptions -fcolor-diagnostics -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /builds/wireshark/wireshark/sbout/2025-09-12-100405-3933-1 -x c /builds/wireshark/wireshark/capture/capture_sync.c
1/* capture_sync.c
* Synchronisation between Wireshark capture parent and child instances
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <[email protected]>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/

11#include "config.h"
12#define WS_LOG_DOMAIN"Capture" LOG_DOMAIN_CAPTURE"Capture"

14#include <wireshark.h>

16#ifdef HAVE_LIBPCAP1

18#include <glib.h>
19#include <stdio.h>
20#include <stdlib.h>

22#include <signal.h>

24#include <ws_exit_codes.h>

26#include <wsutil/application_flavor.h>
27#include <wsutil/strtoi.h>
28#include <wsutil/ws_assert.h>
29#include <wsutil/pint.h>

31#ifdef _WIN32
32#include <wsutil/unicode-utils.h>
33#include <wsutil/win32-utils.h>
34#include <wsutil/ws_pipe.h>
35#else
36#include <glib-unix1.h>
37#endif

39#ifdef HAVE_SYS_WAIT_H1
40# include <sys/wait.h>
41#endif

43#include "capture/capture-pcap-util.h"

45#ifndef _WIN32
46/*
* Define various POSIX macros (and, in the case of WCOREDUMP, non-POSIX
* macros) on UNIX systems that don't have them.
*/
50#ifndef WIFEXITED
51# define WIFEXITED(status)(((status) & 0x7f) == 0)      (((status) & 0177) == 0)
52#endif
53#ifndef WIFSTOPPED
54# define WIFSTOPPED(status)(((status) & 0xff) == 0x7f)     (((status) & 0177) == 0177)
55#endif
56#ifndef WIFSIGNALED
57# define WIFSIGNALED(status)(((signed char) (((status) & 0x7f) + 1) >> 1) > 0
)    (!WIFSTOPPED(status)(((status) & 0xff) == 0x7f) && !WIFEXITED(status)(((status) & 0x7f) == 0))
58#endif
59#ifndef WEXITSTATUS
60# define WEXITSTATUS(status)(((status) & 0xff00) >> 8)    ((status) >> 8)
61#endif
62#ifndef WTERMSIG
63# define WTERMSIG(status)((status) & 0x7f)       ((status) & 0177)
64#endif
65#ifndef WCOREDUMP
66# define WCOREDUMP(status)((status) & 0x80)      ((status) & 0200)
67#endif
68#ifndef WSTOPSIG
69# define WSTOPSIG(status)(((status) & 0xff00) >> 8)       ((status) >> 8)
70#endif
71#endif /* _WIN32 */

73#include <epan/packet.h>
74#include <epan/prefs.h>

76#include "file.h"

78#include "ui/capture.h"
79#include <capture/capture_sync.h>

81#include "sync_pipe.h"

83#ifdef _WIN32
84#include "capture/capture-wpcap.h"
85#endif

87#include "ui/ws_ui_util.h"

89#include <wsutil/filesystem.h>
90#include <wsutil/file_util.h>
91#include <wsutil/report_message.h>
92#include "extcap.h"

94#ifdef _WIN32
95#include <process.h>    /* For spawning child process */
96#endif

98#include <wsutil/ws_pipe.h>

100#ifdef _WIN32
101static int create_dummy_signal_pipe(char **msg);
102static HANDLE dummy_signal_pipe; /* Dummy named pipe which lets the child check for a dropped connection */
103static char *dummy_control_id;
104#else
105static const char *sync_pipe_signame(int);
106#endif

108/* We use this pipe buffer size for both the sync message pipe and the
* data pipe. Ensure that it's large enough for the indicator and header
* plus maximum message size.
*/
112#define PIPE_BUF_SIZE((512 * 1000)+4) (SP_MAX_MSG_LEN(512 * 1000)+4)

114static gboolean sync_pipe_input_cb(GIOChannel *pipe_io, capture_session *cap_session);
115static int sync_pipe_wait_for_child(ws_process_id fork_child, char **msgp);
116static void pipe_convert_header(const unsigned char *header, char *indicator, unsigned *block_len);
117static ssize_t pipe_read_block(GIOChannel *pipe_io, char *indicator, unsigned len, char *msg,
                         char **err_msg);

120static void (*fetch_dumpcap_pid)(ws_process_id);

122void
123capture_session_init(capture_session *cap_session, capture_file *cf,
                   new_file_fn new_file, new_packets_fn new_packets,
                   drops_fn drops, error_fn error,
                   cfilter_error_fn cfilter_error, closed_fn closed)
127{
  cap_session->cf                              = cf;
  cap_session->fork_child                      = WS_INVALID_PID-1;   /* invalid process handle */
  cap_session->pipe_input_id                   = 0;
131#ifdef _WIN32
  cap_session->signal_pipe_write_fd            = -1;
133#endif
  cap_session->state                           = CAPTURE_STOPPED;
135#ifndef _WIN32
  cap_session->owner                           = getuid();
  cap_session->group                           = getgid();
138#endif
  cap_session->count                           = 0;
  cap_session->count_pending                   = 0;
  cap_session->session_will_restart            = false0;

  cap_session->new_file                        = new_file;
  cap_session->new_packets                     = new_packets;
  cap_session->drops                           = drops;
  cap_session->error                           = error;
  cap_session->cfilter_error                   = cfilter_error;
  cap_session->closed                          = closed;
  cap_session->frame_cksum                     = NULL((void*)0);
150}

152void capture_process_finished(capture_session *cap_session)
153{
  capture_options *capture_opts = cap_session->capture_opts;
  interface_options *interface_opts;
  GString *message;
  unsigned i;

  if (!extcap_session_stop(cap_session)) {
      /* At least one extcap process did not fully finish yet, wait for it */
      return;
  }

  if (cap_session->fork_child != WS_INVALID_PID-1) {
      if (capture_opts->stop_after_extcaps) {
          /* User has requested capture stop and all extcaps are gone now */
          capture_opts->stop_after_extcaps = false0;
          sync_pipe_stop(cap_session);
      }
      /* Wait for child process to end, session is not closed yet */
      return;
  }

  /* Construct message and close session */
  message = g_string_new(capture_opts->closed_msg);
  for (i = 0; i < capture_opts->ifaces->len; i++) {
      interface_opts = &g_array_index(capture_opts->ifaces, interface_options, i)(((interface_options*) (void *) (capture_opts->ifaces)->
data) [(i)]);
      if (interface_opts->if_type != IF_EXTCAP) {
          continue;
      }

      if ((interface_opts->extcap_stderr != NULL((void*)0)) &&
          (interface_opts->extcap_stderr->len > 0)) {
          if (message->len > 0) {
              g_string_append(message, "\n")(__builtin_constant_p ("\n") ? __extension__ ({ const char * const
 __val = ("\n"); g_string_append_len_inline (message, __val, (
__val != ((void*)0)) ? (gssize) strlen (((__val) + !(__val)))
 : (gssize) -1); }) : g_string_append_len_inline (message, "\n"
, (gssize) -1));
          }
          g_string_append(message, "Error from extcap pipe: ")(__builtin_constant_p ("Error from extcap pipe: ") ? __extension__
 ({ const char * const __val = ("Error from extcap pipe: "); g_string_append_len_inline
 (message, __val, (__val != ((void*)0)) ? (gssize) strlen (((
__val) + !(__val))) : (gssize) -1); }) : g_string_append_len_inline
 (message, "Error from extcap pipe: ", (gssize) -1));
          g_string_append(message, interface_opts->extcap_stderr->str)(__builtin_constant_p (interface_opts->extcap_stderr->str
) ? __extension__ ({ const char * const __val = (interface_opts
->extcap_stderr->str); g_string_append_len_inline (message
, __val, (__val != ((void*)0)) ? (gssize) strlen (((__val) + !
(__val))) : (gssize) -1); }) : g_string_append_len_inline (message
, interface_opts->extcap_stderr->str, (gssize) -1));
      }
  }

  cap_session->closed(cap_session, message->str);
  g_string_free(message, TRUE)(__builtin_constant_p ((!(0))) ? (((!(0))) ? (g_string_free) (
(message), ((!(0)))) : g_string_free_and_steal (message)) : (
g_string_free) ((message), ((!(0)))));
  g_free(capture_opts->closed_msg);
  capture_opts->closed_msg = NULL((void*)0);
  capture_opts->stop_after_extcaps = false0;
197}

199/* Append an arg (realloc) to an argc/argv array */
200/* (add a string pointer to a NULL-terminated array of string pointers) */
201/* XXX: For glib >= 2.68 we could use a GStrvBuilder.
*/
203static char **
204sync_pipe_add_arg(char **args, int *argc, const char *arg)
205{
  /* Grow the array; "*argc" currently contains the number of string
     pointers, *not* counting the NULL pointer at the end, so we have
     to add 2 in order to get the new size of the array, including the
     new pointer and the terminating NULL pointer. */
  args = (char **)g_realloc( (void *) args, (*argc + 2) * sizeof (char *));
32
←
Memory is allocated→

  /* Stuff the pointer into the penultimate element of the array, which
     is the one at the index specified by "*argc". */
  args[*argc] = g_strdup(arg)g_strdup_inline (arg);
  /* Now bump the count. */
  (*argc)++;

  /* We overwrite the NULL pointer; put it back right after the
     element we added. */
  args[*argc] = NULL((void*)0);

  return args;
223}

225/* Take a buffer from an SP_LOG_MSG from dumpcap and send it to our
* current logger. Keep this in sync with the format used in
* dumpcap_log_writer. (We might want to do more proper serialization
* of more than just the log level.)
*/
230static void
231sync_pipe_handle_log_msg(const char *buffer) {
  const char *log_msg = NULL((void*)0);
  const char* end;
  uint32_t level = 0;

  if (ws_strtou32(buffer, &end, &level) && end[0] == ':') {
      log_msg = end + 1;
  }
  ws_log(LOG_DOMAIN_CAPCHILD"Capchild", level, "%s", log_msg);
240}

242/* Initialize an argument list and add dumpcap to it. */
243static char **
244init_pipe_args(int *argc) {
  char *exename;
  char **argv;

  /* Find the absolute path of the dumpcap executable. */
  exename = get_executable_path("dumpcap");
  if (exename == NULL((void*)0)) {
      return NULL((void*)0);
  }

  /* Allocate the string pointer array with enough space for the
     terminating NULL pointer. */
  *argc = 0;
  argv = (char **)g_malloc(sizeof (char *));
  *argv = NULL((void*)0);

  /* Make that the first argument in the argument list (argv[0]). */
  argv = sync_pipe_add_arg(argv, argc, exename);

  /* Tell dumpcap to log at the lowest level its domain (Capchild) is
   * set to log in the main program. (It might be in the special noisy
   * or debug filter, so we can't just check the overall level.)
   */
  for (enum ws_log_level level = LOG_LEVEL_NOISY; level != _LOG_LEVEL_LAST; level++) {
      if (ws_log_msg_is_active(LOG_DOMAIN_CAPCHILD"Capchild", level)) {
          argv = sync_pipe_add_arg(argv, argc, "--log-level");
          argv = sync_pipe_add_arg(argv, argc, ws_log_level_to_string(level));
          break;
      }
  }

  argv = sync_pipe_add_arg(argv, argc, "--application-flavor");
  argv = sync_pipe_add_arg(argv, argc, application_flavor_name_lower());

  /* sync_pipe_add_arg strdupes exename, so we should free our copy */
  g_free(exename);

  return argv;
282}

284static gboolean
285pipe_io_cb(GIOChannel *pipe_io, GIOCondition condition _U___attribute__((unused)), void * user_data)
286{
  capture_session *cap_session = (capture_session *)user_data;
  if (!sync_pipe_input_cb(pipe_io, cap_session)) {
      cap_session->pipe_input_id = 0;
      return G_SOURCE_REMOVE(0);
  }
  return G_SOURCE_CONTINUE(!(0));
293}

295/*
* Open two pipes to dumpcap with the supplied arguments, one for its
* standard output and one for its standard error.
*
* On success, *msg is unchanged and 0 is returned; data_read_fd,
* message_read_fd, and fork_child point to the standard output pipe's
* file descriptor, the standard error pipe's file descriptor, and
* the child's PID/handle, respectively.
*
* On failure, *msg points to an error message for the failure, and -1 is
* returned, in which case *msg must be freed with g_free().
*/
307#define ARGV_NUMBER_LEN24 24
308static int
309#ifdef _WIN32
310sync_pipe_open_command(char **argv, int *data_read_fd,
                     GIOChannel **message_read_io, int *signal_write_fd,
                     ws_process_id *fork_child, GArray *ifaces,
                     char **msg, void(*update_cb)(void))
314#else
315sync_pipe_open_command(char **argv, int *data_read_fd,
                     GIOChannel **message_read_io, int *signal_write_fd _U___attribute__((unused)),
                     ws_process_id *fork_child, GArray *ifaces _U___attribute__((unused)),
                     char **msg, void(*update_cb)(void))
319#endif
320{
  enum PIPES { PIPE_READ, PIPE_WRITE };   /* Constants 0 and 1 for PIPE_READ and PIPE_WRITE */
  int message_read_fd = -1;
  char sync_id[ARGV_NUMBER_LEN24];
324#ifdef _WIN32
  HANDLE sync_pipe[2];                    /* pipe used to send messages from child to parent */
  HANDLE data_pipe[2];                    /* pipe used to send data from child to parent */
  int signal_pipe_write_fd = -1;
  HANDLE signal_pipe;                     /* named pipe used to send messages from parent to child (currently only stop) */
  char control_id[ARGV_NUMBER_LEN24];
  char *signal_pipe_name;
  size_t i_handles = 0;
  HANDLE *handles;
  GString *args = g_string_sized_new(200);
  char *quoted_arg;
  SECURITY_ATTRIBUTES sa;
  STARTUPINFO si;
  PROCESS_INFORMATION pi;
  int i;
  unsigned j;
  interface_options *interface_opts;
341#else
  int sync_pipe[2];                       /* pipe used to send messages from child to parent */
  int data_pipe[2];                       /* pipe used to send data from child to parent */
344#endif
  *fork_child = WS_INVALID_PID-1;
  if (data_read_fd != NULL((void*)0)) {
      *data_read_fd = -1;
  }
  *message_read_io = NULL((void*)0);
  ws_debug("sync_pipe_open_command")do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 350, __func__, "sync_pipe_open_command"); } } while (0);

  if (!msg) {
      /* We can't return anything */
      g_strfreev(argv);
355#ifdef _WIN32
      g_string_free(args, TRUE)(__builtin_constant_p ((!(0))) ? (((!(0))) ? (g_string_free) (
(args), ((!(0)))) : g_string_free_and_steal (args)) : (g_string_free
) ((args), ((!(0)))));
357#endif
      return -1;
  }

361#ifdef _WIN32
  /* init SECURITY_ATTRIBUTES */
  sa.nLength = sizeof(SECURITY_ATTRIBUTES);
  sa.bInheritHandle = false0;
  sa.lpSecurityDescriptor = NULL((void*)0);

  /* Create a pipe for the child process to send us messages */
  /* (increase this value if you have trouble while fast capture file switches) */
  if (! CreatePipe(&sync_pipe[PIPE_READ], &sync_pipe[PIPE_WRITE], &sa, PIPE_BUF_SIZE((512 * 1000)+4))) {
      /* Couldn't create the message pipe between parent and child. */
      *msg = ws_strdup_printf("Couldn't create sync pipe: %s",wmem_strdup_printf(((void*)0), "Couldn't create sync pipe: %s"
, win32strerror(GetLastError()))
                             win32strerror(GetLastError()))wmem_strdup_printf(((void*)0), "Couldn't create sync pipe: %s"
, win32strerror(GetLastError()));
      g_strfreev(argv);
      return -1;
  }

  /*
   * Associate a C run-time file handle with the Windows HANDLE for the
   * read side of the message pipe.
   *
   * (See http://www.flounder.com/handles.htm for information on various
   * types of file handle in C/C++ on Windows.)
   */
  message_read_fd = _open_osfhandle( (intptr_t) sync_pipe[PIPE_READ], _O_BINARY);
  if (message_read_fd == -1) {
      *msg = ws_strdup_printf("Couldn't get C file handle for message read pipe: %s", g_strerror(errno))wmem_strdup_printf(((void*)0), "Couldn't get C file handle for message read pipe: %s"
, g_strerror((*__errno_location ())));
      g_strfreev(argv);
      CloseHandle(sync_pipe[PIPE_READ]);
      CloseHandle(sync_pipe[PIPE_WRITE]);
      return -1;
  }

  if (data_read_fd != NULL((void*)0)) {
      /* Create a pipe for the child process to send us data */
      /* (increase this value if you have trouble while fast capture file switches) */
      if (! CreatePipe(&data_pipe[PIPE_READ], &data_pipe[PIPE_WRITE], &sa, PIPE_BUF_SIZE((512 * 1000)+4))) {
          /* Couldn't create the message pipe between parent and child. */
          *msg = ws_strdup_printf("Couldn't create data pipe: %s",wmem_strdup_printf(((void*)0), "Couldn't create data pipe: %s"
, win32strerror(GetLastError()))
                                 win32strerror(GetLastError()))wmem_strdup_printf(((void*)0), "Couldn't create data pipe: %s"
, win32strerror(GetLastError()));
          g_strfreev(argv);
          ws_closeclose(message_read_fd);    /* Should close sync_pipe[PIPE_READ] */
          CloseHandle(sync_pipe[PIPE_WRITE]);
          return -1;
      }

      /*
       * Associate a C run-time file handle with the Windows HANDLE for the
       * read side of the data pipe.
       *
       * (See http://www.flounder.com/handles.htm for information on various
       * types of file handle in C/C++ on Windows.)
       */
      *data_read_fd = _open_osfhandle( (intptr_t) data_pipe[PIPE_READ], _O_BINARY);
      if (*data_read_fd == -1) {
          *msg = ws_strdup_printf("Couldn't get C file handle for data read pipe: %s", g_strerror(errno))wmem_strdup_printf(((void*)0), "Couldn't get C file handle for data read pipe: %s"
, g_strerror((*__errno_location ())));
          g_strfreev(argv);
          CloseHandle(data_pipe[PIPE_READ]);
          CloseHandle(data_pipe[PIPE_WRITE]);
          ws_closeclose(message_read_fd);    /* Should close sync_pipe[PIPE_READ] */
          CloseHandle(sync_pipe[PIPE_WRITE]);
          return -1;
      }
  }

  if (signal_write_fd != NULL((void*)0)) {
      /* Create the signal pipe */
      snprintf(control_id, ARGV_NUMBER_LEN24, "%ld", GetCurrentProcessId());
      signal_pipe_name = ws_strdup_printf(SIGNAL_PIPE_FORMAT, control_id)wmem_strdup_printf(((void*)0), SIGNAL_PIPE_FORMAT, control_id
);
      signal_pipe = CreateNamedPipe(utf_8to16(signal_pipe_name),
                                    PIPE_ACCESS_OUTBOUND, PIPE_TYPE_BYTE, 1, 65535, 65535, 0, NULL((void*)0));
      g_free(signal_pipe_name);

      if (signal_pipe == INVALID_HANDLE_VALUE) {
          /* Couldn't create the signal pipe between parent and child. */
          *msg = ws_strdup_printf("Couldn't create signal pipe: %s",wmem_strdup_printf(((void*)0), "Couldn't create signal pipe: %s"
, win32strerror(GetLastError()))
                         win32strerror(GetLastError()))wmem_strdup_printf(((void*)0), "Couldn't create signal pipe: %s"
, win32strerror(GetLastError()));
          g_strfreev(argv);
          ws_closeclose(message_read_fd);    /* Should close sync_pipe[PIPE_READ] */
          CloseHandle(sync_pipe[PIPE_WRITE]);
          return -1;
      }

      /*
       * Associate a C run-time file handle with the Windows HANDLE for the
       * read side of the message pipe.
       *
       * (See http://www.flounder.com/handles.htm for information on various
       * types of file handle in C/C++ on Windows.)
       */
      signal_pipe_write_fd = _open_osfhandle( (intptr_t) signal_pipe, _O_BINARY);
      if (signal_pipe_write_fd == -1) {
          /* Couldn't create the pipe between parent and child. */
          *msg = ws_strdup_printf("Couldn't get C file handle for sync pipe: %s", g_strerror(errno))wmem_strdup_printf(((void*)0), "Couldn't get C file handle for sync pipe: %s"
, g_strerror((*__errno_location ())));
          g_strfreev(argv);
          ws_closeclose(message_read_fd);    /* Should close sync_pipe[PIPE_READ] */
          CloseHandle(sync_pipe[PIPE_WRITE]);
          CloseHandle(signal_pipe);
          return -1;
      }
  }

  /* init STARTUPINFO & PROCESS_INFORMATION */
  memset(&si, 0, sizeof(si));
  si.cb           = sizeof(si);
  memset(&pi, 0, sizeof(pi));
466#ifdef DEBUG_CHILD
  si.dwFlags = STARTF_USESHOWWINDOW;
  si.wShowWindow  = SW_SHOW;
469#else
  si.dwFlags = STARTF_USESTDHANDLES|STARTF_USESHOWWINDOW;
  si.wShowWindow  = SW_HIDE;  /* this hides the console window */

  if (data_read_fd == NULL((void*)0)) {
      si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
      si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
  } else {
      si.hStdInput = NULL((void*)0); /* handle for named pipe*/
      si.hStdOutput = data_pipe[PIPE_WRITE];
  }
  si.hStdError = GetStdHandle(STD_ERROR_HANDLE);

  /* On Windows, "[a]n inherited handle refers to the same object in the child
   * process as it does in the parent process. It also has the same value."
   * https://learn.microsoft.com/en-us/windows/win32/procthread/inheritance
   * When converted to a file descriptor (via _open_osfhandle), the fd
   * value is not necessarily the same in the two processes, but the handle
   * value can be shared.
   * A HANDLE is a void* though "64-bit versions of Windows use 32-bit handles
   * for interoperability... only the lower 32 bits are significant, so it is
   * safe to truncate the handle... or sign-extend the handle"
   * https://learn.microsoft.com/en-us/windows/win32/winprog64/interprocess-communication
   * So it should be fine to call PtrToLong instead of casting to intptr_t.
   * https://learn.microsoft.com/en-us/windows/win32/WinProg64/rules-for-using-pointers
   */
  int argc = g_strv_length(argv);
  argv = sync_pipe_add_arg(argv, &argc, "-Z");
  snprintf(sync_id, ARGV_NUMBER_LEN24, "%ld", PtrToLong(sync_pipe[PIPE_WRITE]));
  argv = sync_pipe_add_arg(argv, &argc, sync_id);
499#endif

  if (ifaces) {
      for (j = 0; j < ifaces->len; j++) {
          interface_opts = &g_array_index(ifaces, interface_options, j)(((interface_options*) (void *) (ifaces)->data) [(j)]);
          if (interface_opts->extcap_fifo != NULL((void*)0)) {
              i_handles++;
          }
      }
  }
  handles = g_new(HANDLE, 3 + i_handles)((HANDLE *) g_malloc_n ((3 + i_handles), sizeof (HANDLE)));
  i_handles = 0;
  if (si.hStdInput) {
      handles[i_handles++] = si.hStdInput;
  }
  if (si.hStdOutput && (si.hStdOutput != si.hStdInput)) {
      handles[i_handles++] = si.hStdOutput;
  }
  handles[i_handles++] = sync_pipe[PIPE_WRITE];
  if (ifaces) {
      for (j = 0; j < ifaces->len; j++) {
          interface_opts = &g_array_index(ifaces, interface_options, j)(((interface_options*) (void *) (ifaces)->data) [(j)]);
          if (interface_opts->extcap_fifo != NULL((void*)0)) {
              handles[i_handles++] = interface_opts->extcap_pipe_h;
          }
      }
  }

  /* convert args array into a single string */
  /* XXX - could change sync_pipe_add_arg() instead */
  /* there is a drawback here: the length is internally limited to 1024 bytes */
  for(i=0; argv[i] != 0; i++) {
      if(i != 0) g_string_append_c(args, ' ')g_string_append_c_inline (args, ' ');    /* don't prepend a space before the path!!! */
      quoted_arg = protect_arg(argv[i]);
      g_string_append(args, quoted_arg)(__builtin_constant_p (quoted_arg) ? __extension__ ({ const char
 * const __val = (quoted_arg); g_string_append_len_inline (args
, __val, (__val != ((void*)0)) ? (gssize) strlen (((__val) + !
(__val))) : (gssize) -1); }) : g_string_append_len_inline (args
, quoted_arg, (gssize) -1));
      g_free(quoted_arg);
  }

  /* call dumpcap */
  if(!win32_create_process(argv[0], args->str, NULL((void*)0), NULL((void*)0), i_handles, handles,
                           CREATE_NEW_CONSOLE, NULL((void*)0), NULL((void*)0), &si, &pi)) {
      *msg = ws_strdup_printf("Couldn't run %s in child process: %s",wmem_strdup_printf(((void*)0), "Couldn't run %s in child process: %s"
, args->str, win32strerror(GetLastError()))
                             args->str, win32strerror(GetLastError()))wmem_strdup_printf(((void*)0), "Couldn't run %s in child process: %s"
, args->str, win32strerror(GetLastError()));
      if (data_read_fd) {
          ws_closeclose(*data_read_fd);       /* Should close data_pipe[PIPE_READ] */
          CloseHandle(data_pipe[PIPE_WRITE]);
      } else {
          ws_closeclose(signal_pipe_write_fd);
      }
      ws_closeclose(message_read_fd);    /* Should close sync_pipe[PIPE_READ] */
      CloseHandle(sync_pipe[PIPE_WRITE]);
      g_strfreev(argv);
      g_string_free(args, TRUE)(__builtin_constant_p ((!(0))) ? (((!(0))) ? (g_string_free) (
(args), ((!(0)))) : g_string_free_and_steal (args)) : (g_string_free
) ((args), ((!(0)))));
      g_free(handles);
      return -1;
  }
  *fork_child = pi.hProcess;
  /* We may need to store this and close it later */
  CloseHandle(pi.hThread);
  g_strfreev(argv);
  g_string_free(args, TRUE)(__builtin_constant_p ((!(0))) ? (((!(0))) ? (g_string_free) (
(args), ((!(0)))) : g_string_free_and_steal (args)) : (g_string_free
) ((args), ((!(0)))));
  g_free(handles);

  if (signal_write_fd != NULL((void*)0)) {
      *signal_write_fd = signal_pipe_write_fd;
  }
565#else /* _WIN32 */
  /* Create a pipe for the child process to send us messages */
  if (pipe(sync_pipe) < 0) {
      /* Couldn't create the message pipe between parent and child. */
      *msg = ws_strdup_printf("Couldn't create sync pipe: %s", g_strerror(errno))wmem_strdup_printf(((void*)0), "Couldn't create sync pipe: %s"
, g_strerror((*__errno_location ())));
      g_strfreev(argv);
      return -1;
  }

  if (data_read_fd != NULL((void*)0)) {
      /* Create a pipe for the child process to send us data */
      if (pipe(data_pipe) < 0) {
          /* Couldn't create the data pipe between parent and child. */
          *msg = ws_strdup_printf("Couldn't create data pipe: %s", g_strerror(errno))wmem_strdup_printf(((void*)0), "Couldn't create data pipe: %s"
, g_strerror((*__errno_location ())));
          g_strfreev(argv);
          ws_closeclose(sync_pipe[PIPE_READ]);
          ws_closeclose(sync_pipe[PIPE_WRITE]);
          return -1;
      }
  }

  if ((*fork_child = fork()) == 0) {
      /*
       * Child process - run dumpcap with the right arguments to make
       * it just capture with the specified capture parameters
       */
      if (data_read_fd != NULL((void*)0)) {
          dup2(data_pipe[PIPE_WRITE], 1);
          ws_closeclose(data_pipe[PIPE_READ]);
          ws_closeclose(data_pipe[PIPE_WRITE]);
      }
      ws_closeclose(sync_pipe[PIPE_READ]);
      /* dumpcap should be running in capture child mode (hidden feature) */
598#ifndef DEBUG_CHILD
      int argc = g_strv_length(argv);
      argv = sync_pipe_add_arg(argv, &argc, "-Z");
      snprintf(sync_id, ARGV_NUMBER_LEN24, "%d", sync_pipe[PIPE_WRITE]);
      argv = sync_pipe_add_arg(argv, &argc, sync_id);
603#endif
      execv(argv[0], argv);
      sync_pipe_write_int_msg(sync_pipe[PIPE_WRITE], SP_EXEC_FAILED'X', errno(*__errno_location ()));

      /* Exit with "_exit()", so that we don't close the connection
         to the X server (and cause stuff buffered up by our parent but
         not yet sent to be sent, as that stuff should only be sent by
         our parent).  We've sent an error message to the parent, so
         we exit with an exit status of 1 (any exit status other than
         0 or 1 will cause an additional message to report that exit
         status, over and above the error message we sent to the parent). */
      _exit(1);
  }

  g_strfreev(argv);

  if (fetch_dumpcap_pid && *fork_child > 0)
      fetch_dumpcap_pid(*fork_child);

  if (data_read_fd != NULL((void*)0)) {
      *data_read_fd = data_pipe[PIPE_READ];
  }
  message_read_fd = sync_pipe[PIPE_READ];

627#endif

  /* Parent process - read messages from the child process over the
     sync pipe. */

  /* Close the write sides of the pipes, so that only the child has them
     open, and thus they completely close, and thus return to us
     an EOF indication, if the child closes them (either deliberately
     or by exiting abnormally). */
636#ifdef _WIN32
  if (data_read_fd != NULL((void*)0)) {
      CloseHandle(data_pipe[PIPE_WRITE]);
  }
  CloseHandle(sync_pipe[PIPE_WRITE]);
641#else
  if (data_read_fd != NULL((void*)0)) {
      ws_closeclose(data_pipe[PIPE_WRITE]);
  }
  ws_closeclose(sync_pipe[PIPE_WRITE]);
646#endif

  if (*fork_child == WS_INVALID_PID-1) {
      /* We couldn't even create the child process. */
      *msg = ws_strdup_printf("Couldn't create child process: %s", g_strerror(errno))wmem_strdup_printf(((void*)0), "Couldn't create child process: %s"
, g_strerror((*__errno_location ())));
      if (data_read_fd != NULL((void*)0)) {
          ws_closeclose(*data_read_fd);
      }
654#ifdef _WIN32
      if (signal_write_fd != NULL((void*)0)) {
          ws_closeclose(signal_pipe_write_fd);
      }
658#endif
      ws_closeclose(message_read_fd);
      return -1;
  }

663#ifdef _WIN32
  *message_read_io = g_io_channel_win32_new_fd(message_read_fd);
665#else
  *message_read_io = g_io_channel_unix_new(message_read_fd);
667#endif
  g_io_channel_set_encoding(*message_read_io, NULL((void*)0), NULL((void*)0));
  g_io_channel_set_buffered(*message_read_io, false0);
  g_io_channel_set_close_on_unref(*message_read_io, true1);

  /* we might wait for a moment till child is ready, so update screen now */
  if (update_cb) update_cb();
  return 0;
675}

677/* a new capture run: start a new dumpcap task and hand over parameters through command line */
678bool_Bool
679sync_pipe_start(capture_options *capture_opts, GPtrArray *capture_comments,
              capture_session *cap_session, info_data_t* cap_data,
              void (*update_cb)(void))
682{
683#ifdef _WIN32
  char control_id[ARGV_NUMBER_LEN24];
685#endif
  GIOChannel *sync_pipe_read_io;
  int argc;
  char **argv;
  int i;
  unsigned j;
  interface_options *interface_opts;

  if (capture_opts->ifaces->len > 1)
1
Assuming field 'len' is <= 1→
2
←
Taking false branch→
      capture_opts->use_pcapng = true1;
  ws_debug("sync_pipe_start")do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 695, __func__, "sync_pipe_start"); } } while (0);
3
←
Taking true branch→
4
←
Loop condition is false.  Exiting loop→
  capture_opts_log(LOG_DOMAIN_CAPTURE"Capture", LOG_LEVEL_DEBUG, capture_opts);

  cap_session->fork_child = WS_INVALID_PID-1;
  cap_session->capture_opts = capture_opts;

  if (!extcap_init_interfaces(cap_session)) {
5
←
Assuming the condition is false→
6
←
Taking false branch→
      report_failure("Unable to init extcaps. (tmp fifo already exists?)");
      return false0;
  }

  argv = init_pipe_args(&argc);
  if (!argv) {
7
←
Assuming 'argv' is non-null→
8
←
Taking false branch→
      /* We don't know where to find dumpcap. */
      report_failure("We don't know where to find dumpcap.");
      return false0;
  }

  if (capture_opts->ifaces->len > 1)
9
←
Assuming field 'len' is <= 1→
10
←
Taking false branch→
      argv = sync_pipe_add_arg(argv, &argc, "-t");

  argv = sync_pipe_add_arg(argv, &argc, "-F");
  if (capture_opts->use_pcapng)
11
←
Assuming field 'use_pcapng' is false→
12
←
Taking false branch→
      argv = sync_pipe_add_arg(argv, &argc, "pcapng");
  else
      argv = sync_pipe_add_arg(argv, &argc, "pcap");

  if (capture_comments != NULL((void*)0)) {
13
←
Assuming 'capture_comments' is equal to NULL→
14
←
Taking false branch→
      for (j = 0; j < capture_comments->len; j++) {
          argv = sync_pipe_add_arg(argv, &argc, "--capture-comment");
          argv = sync_pipe_add_arg(argv, &argc, (char*)g_ptr_array_index(capture_comments, j)((capture_comments)->pdata)[j]);
      }
  }

  if (capture_opts->temp_dir) {
15
←
Assuming field 'temp_dir' is null→
16
←
Taking false branch→
          argv = sync_pipe_add_arg(argv, &argc, "--temp-dir");
          argv = sync_pipe_add_arg(argv, &argc, capture_opts->temp_dir);
  }

  if (capture_opts->multi_files_on) {
17
←
Assuming field 'multi_files_on' is false→
18
←
Taking false branch→
      if (capture_opts->has_autostop_filesize) {
          char sfilesize[ARGV_NUMBER_LEN24];
          argv = sync_pipe_add_arg(argv, &argc, "-b");
          snprintf(sfilesize, ARGV_NUMBER_LEN24, "filesize:%u",capture_opts->autostop_filesize);
          argv = sync_pipe_add_arg(argv, &argc, sfilesize);
      }

      if (capture_opts->has_file_duration) {
          char sfile_duration[ARGV_NUMBER_LEN24];
          argv = sync_pipe_add_arg(argv, &argc, "-b");
          snprintf(sfile_duration, ARGV_NUMBER_LEN24, "duration:%f",capture_opts->file_duration);
          argv = sync_pipe_add_arg(argv, &argc, sfile_duration);
      }

      if (capture_opts->has_file_interval) {
          char sfile_interval[ARGV_NUMBER_LEN24];
          argv = sync_pipe_add_arg(argv, &argc, "-b");
          snprintf(sfile_interval, ARGV_NUMBER_LEN24, "interval:%d",capture_opts->file_interval);
          argv = sync_pipe_add_arg(argv, &argc, sfile_interval);
      }

      if (capture_opts->has_file_packets) {
          char sfile_packets[ARGV_NUMBER_LEN24];
          argv = sync_pipe_add_arg(argv, &argc, "-b");
          snprintf(sfile_packets, ARGV_NUMBER_LEN24, "packets:%d",capture_opts->file_packets);
          argv = sync_pipe_add_arg(argv, &argc, sfile_packets);
      }

      if (capture_opts->has_ring_num_files) {
          char sring_num_files[ARGV_NUMBER_LEN24];
          argv = sync_pipe_add_arg(argv, &argc, "-b");
          snprintf(sring_num_files, ARGV_NUMBER_LEN24, "files:%d",capture_opts->ring_num_files);
          argv = sync_pipe_add_arg(argv, &argc, sring_num_files);
      }

      if (capture_opts->print_file_names) {
          char *print_name = g_strdup_printf("printname:%s", capture_opts->print_name_to);
          argv = sync_pipe_add_arg(argv, &argc, "-b");
          argv = sync_pipe_add_arg(argv, &argc, print_name);
          g_free(print_name);
      }

      if (capture_opts->has_nametimenum) {
          char nametimenum[ARGV_NUMBER_LEN24];
          argv = sync_pipe_add_arg(argv, &argc, "-b");
          snprintf(nametimenum, ARGV_NUMBER_LEN24, "nametimenum:2");
          argv = sync_pipe_add_arg(argv, &argc, nametimenum);
      }

      if (capture_opts->has_autostop_files) {
          char sautostop_files[ARGV_NUMBER_LEN24];
          argv = sync_pipe_add_arg(argv, &argc, "-a");
          snprintf(sautostop_files, ARGV_NUMBER_LEN24, "files:%d",capture_opts->autostop_files);
          argv = sync_pipe_add_arg(argv, &argc, sautostop_files);
      }
  } else {
      if (capture_opts->has_autostop_filesize) {
19
←
Assuming field 'has_autostop_filesize' is false→
20
←
Taking false branch→
          char sautostop_filesize[ARGV_NUMBER_LEN24];
          argv = sync_pipe_add_arg(argv, &argc, "-a");
          snprintf(sautostop_filesize, ARGV_NUMBER_LEN24, "filesize:%u",capture_opts->autostop_filesize);
          argv = sync_pipe_add_arg(argv, &argc, sautostop_filesize);
      }
  }

  if (capture_opts->has_autostop_packets) {
21
←
Assuming field 'has_autostop_packets' is false→
22
←
Taking false branch→
      char scount[ARGV_NUMBER_LEN24];
      argv = sync_pipe_add_arg(argv, &argc, "-c");
      snprintf(scount, ARGV_NUMBER_LEN24, "%d",capture_opts->autostop_packets);
      argv = sync_pipe_add_arg(argv, &argc, scount);
  }

  if (capture_opts->has_autostop_duration) {
23
←
Assuming field 'has_autostop_duration' is false→
24
←
Taking false branch→
      char sautostop_duration[ARGV_NUMBER_LEN24];
      argv = sync_pipe_add_arg(argv, &argc, "-a");
      snprintf(sautostop_duration, ARGV_NUMBER_LEN24, "duration:%f",capture_opts->autostop_duration);
      argv = sync_pipe_add_arg(argv, &argc, sautostop_duration);
  }

  if (capture_opts->has_autostop_written_packets) {
25
←
Assuming field 'has_autostop_written_packets' is false→
26
←
Taking false branch→
      char scount[ARGV_NUMBER_LEN24];
      argv = sync_pipe_add_arg(argv, &argc, "-a");
      snprintf(scount, ARGV_NUMBER_LEN24, "packets:%d",capture_opts->autostop_written_packets);
      argv = sync_pipe_add_arg(argv, &argc, scount);
  }

  if (capture_opts->group_read_access) {
27
←
Assuming field 'group_read_access' is false→
28
←
Taking false branch→
      argv = sync_pipe_add_arg(argv, &argc, "-g");
  }

  if (capture_opts->update_interval != DEFAULT_UPDATE_INTERVAL100) {
29
←
Assuming field 'update_interval' is not equal to DEFAULT_UPDATE_INTERVAL→
30
←
Taking true branch→
      char scount[ARGV_NUMBER_LEN24];
      argv = sync_pipe_add_arg(argv, &argc, "--update-interval");
      snprintf(scount, ARGV_NUMBER_LEN24, "%d", capture_opts->update_interval);
      argv = sync_pipe_add_arg(argv, &argc, scount);
31
←
Calling 'sync_pipe_add_arg'→
33
←
Returned allocated memory→
  }

  for (j = 0; j < capture_opts->ifaces->len; j++) {
34
←
Assuming 'j' is >= field 'len'→
35
←
Loop condition is false. Execution continues on line 943→
      interface_opts = &g_array_index(capture_opts->ifaces, interface_options, j)(((interface_options*) (void *) (capture_opts->ifaces)->
data) [(j)]);

      argv = sync_pipe_add_arg(argv, &argc, "-i");
      if (interface_opts->extcap_fifo != NULL((void*)0))
      {
837#ifdef _WIN32
          char *pipe = ws_strdup_printf("%s%" PRIuMAX, EXTCAP_PIPE_PREFIX, (uintmax_t)interface_opts->extcap_pipe_h)wmem_strdup_printf(((void*)0), "%s%" "l" "u", "wireshark_extcap"
, (uintmax_t)interface_opts->extcap_pipe_h);
          argv = sync_pipe_add_arg(argv, &argc, pipe);
          g_free(pipe);
841#else
          argv = sync_pipe_add_arg(argv, &argc, interface_opts->extcap_fifo);
843#endif
          /* Add a name for the interface, to put into an IDB. */
          argv = sync_pipe_add_arg(argv, &argc, "--ifname");
          argv = sync_pipe_add_arg(argv, &argc, interface_opts->name);
      }
      else
          argv = sync_pipe_add_arg(argv, &argc, interface_opts->name);

      if (interface_opts->descr != NULL((void*)0))
      {
          /* Add a description for the interface to put into an IDB and
           * use for the temporary filename. */
          argv = sync_pipe_add_arg(argv, &argc, "--ifdescr");
          argv = sync_pipe_add_arg(argv, &argc, interface_opts->descr);
      }

      if (interface_opts->cfilter != NULL((void*)0) && strlen(interface_opts->cfilter) != 0) {
          argv = sync_pipe_add_arg(argv, &argc, "-f");
          argv = sync_pipe_add_arg(argv, &argc, interface_opts->cfilter);
      }
      if (!interface_opts->optimize) {
          argv = sync_pipe_add_arg(argv, &argc, "--no-optimize");
      }
      if (interface_opts->has_snaplen) {
          char ssnap[ARGV_NUMBER_LEN24];
          argv = sync_pipe_add_arg(argv, &argc, "-s");
          snprintf(ssnap, ARGV_NUMBER_LEN24, "%d", interface_opts->snaplen);
          argv = sync_pipe_add_arg(argv, &argc, ssnap);
      }

      if (interface_opts->linktype != -1) {
          const char *linktype = linktype_val_to_name(interface_opts->linktype);
          if ( linktype != NULL((void*)0) )
          {
              argv = sync_pipe_add_arg(argv, &argc, "-y");
              argv = sync_pipe_add_arg(argv, &argc, linktype);
          }
      }

      if (!interface_opts->promisc_mode) {
          argv = sync_pipe_add_arg(argv, &argc, "-p");
      }

      if (interface_opts->buffer_size != DEFAULT_CAPTURE_BUFFER_SIZE2) {
          char buffer_size[ARGV_NUMBER_LEN24];
          argv = sync_pipe_add_arg(argv, &argc, "-B");
          if(interface_opts->buffer_size == 0x00)
              interface_opts->buffer_size = DEFAULT_CAPTURE_BUFFER_SIZE2;
          snprintf(buffer_size, ARGV_NUMBER_LEN24, "%d", interface_opts->buffer_size);
          argv = sync_pipe_add_arg(argv, &argc, buffer_size);
      }

      if (interface_opts->monitor_mode) {
          argv = sync_pipe_add_arg(argv, &argc, "-I");
      }

899#ifdef HAVE_PCAP_REMOTE
      if (interface_opts->datatx_udp)
          argv = sync_pipe_add_arg(argv, &argc, "-u");

      if (!interface_opts->nocap_rpcap)
          argv = sync_pipe_add_arg(argv, &argc, "-r");

      if (interface_opts->auth_type == CAPTURE_AUTH_PWD) {
          char sauth[256];
          argv = sync_pipe_add_arg(argv, &argc, "-A");
          snprintf(sauth, sizeof(sauth), "%s:%s",
                     interface_opts->auth_username,
                     interface_opts->auth_password);
          argv = sync_pipe_add_arg(argv, &argc, sauth);
      }
914#endif

916#ifdef HAVE_PCAP_SETSAMPLING
      if (interface_opts->sampling_method != CAPTURE_SAMP_NONE) {
          char ssampling[ARGV_NUMBER_LEN24];
          argv = sync_pipe_add_arg(argv, &argc, "-m");
          snprintf(ssampling, ARGV_NUMBER_LEN24, "%s:%d",
                     interface_opts->sampling_method == CAPTURE_SAMP_BY_COUNT ? "count" :
                     interface_opts->sampling_method == CAPTURE_SAMP_BY_TIMER ? "timer" :
                     "undef",
                     interface_opts->sampling_param);
          argv = sync_pipe_add_arg(argv, &argc, ssampling);
      }
927#endif
      if (interface_opts->timestamp_type) {
          argv = sync_pipe_add_arg(argv, &argc, "--time-stamp-type");
          argv = sync_pipe_add_arg(argv, &argc, interface_opts->timestamp_type);
      }
  }

934#ifndef DEBUG_CHILD
935#ifdef _WIN32
  /* pass process id to dumpcap for named signal pipe */
  argv = sync_pipe_add_arg(argv, &argc, "--signal-pipe");
  snprintf(control_id, ARGV_NUMBER_LEN24, "%ld", GetCurrentProcessId());
  argv = sync_pipe_add_arg(argv, &argc, control_id);
940#endif
941#endif

  if (capture_opts->save_file) {
36
←
Assuming field 'save_file' is null→
37
←
Taking false branch→
      argv = sync_pipe_add_arg(argv, &argc, "-w");
      argv = sync_pipe_add_arg(argv, &argc, capture_opts->save_file);
  }
  for (i = 0; i < argc; i++) {
38
←
Assuming 'i' is >= 'argc'→
39
←
Loop condition is false. Execution continues on line 950→
      ws_debug("argv[%d]: %s", i, argv[i])do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 948, __func__, "argv[%d]: %s", i, argv[i]); } } while (0);
  }
  if (capture_opts->compress_type) {
40
←
Assuming field 'compress_type' is null→
41
←
Taking false branch→
      argv = sync_pipe_add_arg(argv, &argc, "--compress-type");
      argv = sync_pipe_add_arg(argv, &argc, capture_opts->compress_type);
  }

  int ret;
  char* msg;
957#ifdef _WIN32
  ret = sync_pipe_open_command(argv, NULL((void*)0), &sync_pipe_read_io, &cap_session->signal_pipe_write_fd,
                               &cap_session->fork_child, capture_opts->ifaces, &msg, update_cb);
960#else
  ret = sync_pipe_open_command(argv, NULL((void*)0), &sync_pipe_read_io, NULL((void*)0),
42
←
Potential leak of memory pointed to by 'argv'
                               &cap_session->fork_child, NULL((void*)0), &msg, update_cb);
963#endif

  if (ret == -1) {
      report_failure("%s", msg);
      g_free(msg);
      return false0;
  }

  /* Parent process - read messages from the child process over the
     sync pipe. */

  cap_session->fork_child_status = 0;
  cap_session->cap_data_info = cap_data;

  /* We were able to set up to read the capture file;
     arrange that our callback be called whenever it's possible
     to read from the sync pipe, so that it's called when
     the child process wants to tell us something. */

  /* we have a running capture, now wait for the real capture filename */
  if (cap_session->pipe_input_id) {
      g_source_remove(cap_session->pipe_input_id);
      cap_session->pipe_input_id = 0;
  }
  cap_session->pipe_input_id = g_io_add_watch(sync_pipe_read_io, G_IO_IN | G_IO_HUP, pipe_io_cb, cap_session);
  /* Pipe will be closed when watch is removed */
  g_io_channel_unref(sync_pipe_read_io);

  return true1;
992}

994/*
* Close the pipes we're using to read from dumpcap, and wait for it
* to exit.  On success, *msgp is unchanged, and the exit status of
* dumpcap is returned.  On failure (which includes "dumpcap exited
* due to being killed by a signal or an exception"), *msgp points
* to an error message for the failure, and -1 is returned.  In the
* latter case, *msgp must be freed with g_free().
*/
1002static int
1003sync_pipe_close_command(int *data_read_fd, GIOChannel *message_read_io,
ws_process_id *fork_child, char **msgp)
1005{
  ws_closeclose(*data_read_fd);
  if (message_read_io != NULL((void*)0))
      g_io_channel_unref(message_read_io);

1010#ifdef _WIN32
  /* XXX - Should we signal the child somehow? */
  sync_pipe_kill(*fork_child);
1013#endif

  return sync_pipe_wait_for_child(*fork_child, msgp);
1016}

1018/*
* Run dumpcap with the supplied arguments.
*
* On success, *data points to a buffer containing the dumpcap output,
* *primary_msg and *secondary_message are NULL, and 0 is returned; *data
* must be freed with g_free().
*
* On failure, *data is NULL, *primary_msg points to an error message,
* *secondary_msg either points to an additional error message or is
* NULL, and -1 is returned; *primary_msg, and *secondary_msg if not NULL,
* must be freed with g_free().
*/
1030static int
1031sync_pipe_run_command_actual(char **argv, char **data, char **primary_msg,
                    char **secondary_msg,  void(*update_cb)(void))
1033{
  char *msg;
  int data_pipe_read_fd, ret;
  GIOChannel *sync_pipe_read_io;
  ws_process_id fork_child;
  char *wait_msg;
  char *buffer = g_malloc(PIPE_BUF_SIZE((512 * 1000)+4) + 1);
  ssize_t nread;
  char indicator;
  int32_t exec_errno = 0;
  unsigned primary_msg_len;
  const char *primary_msg_text;
  unsigned secondary_msg_len;
  const char *secondary_msg_text;
  char *combined_msg;
  GString *data_buf = NULL((void*)0);
  ssize_t count;

  if (buffer == NULL((void*)0)) {
      /* g_malloc is supposed to terminate the program if this fails, but,
       * at least on a RELEASE build, some versions of gcc don't think that
       * happens.
       */
      *primary_msg = ws_strdup_printf("Couldn't allocate memory for dumpcap output buffer: %s",wmem_strdup_printf(((void*)0), "Couldn't allocate memory for dumpcap output buffer: %s"
, g_strerror((*__errno_location ())))
                                      g_strerror(errno))wmem_strdup_printf(((void*)0), "Couldn't allocate memory for dumpcap output buffer: %s"
, g_strerror((*__errno_location ())));
      *secondary_msg = NULL((void*)0);
      *data = NULL((void*)0);
      return -1;
  }

  ret = sync_pipe_open_command(argv, &data_pipe_read_fd, &sync_pipe_read_io, NULL((void*)0),
                               &fork_child, NULL((void*)0), &msg, update_cb);
  if (ret == -1) {
      *primary_msg = msg;
      *secondary_msg = NULL((void*)0);
      *data = NULL((void*)0);
      g_free(buffer);
      return -1;
  }

  /*
   * We were able to set up to read dumpcap's output.  Do so.
   *
   * First, wait for an SP_ERROR_MSG message or SP_SUCCESS message.
   */
  do {
      nread = pipe_read_block(sync_pipe_read_io, &indicator, SP_MAX_MSG_LEN(512 * 1000),
                              buffer, primary_msg);
      if(nread <= 0) {
          /* We got a read error from the sync pipe, or we got no data at
             all from the sync pipe, so we're not going to be getting any
             data or error message from the child process.  Pick up its
             exit status, and complain.

             We don't have to worry about killing the child, if the sync pipe
             returned an error. Usually this error is caused as the child killed
             itself while going down. Even in the rare cases that this isn't the
             case, the child will get an error when writing to the broken pipe
             the next time, cleaning itself up then. */
          g_io_channel_unref(sync_pipe_read_io);
          ret = sync_pipe_wait_for_child(fork_child, &wait_msg);
          if(nread == 0) {
              /* We got an EOF from the sync pipe.  That means that it exited
                 before giving us any data to read.  If ret is -1, we report
                 that as a bad exit (e.g., exiting due to a signal); otherwise,
                 we report it as a premature exit. */
              if (ret == -1)
                  *primary_msg = wait_msg;
              else
                  *primary_msg = g_strdup("Child dumpcap closed sync pipe prematurely")g_strdup_inline ("Child dumpcap closed sync pipe prematurely"
);
          } else {
              /* We got an error from the sync pipe.  If ret is -1, report
                 both the sync pipe I/O error and the wait error. */
              if (ret == -1) {
                  combined_msg = ws_strdup_printf("%s\n\n%s", *primary_msg, wait_msg)wmem_strdup_printf(((void*)0), "%s\n\n%s", *primary_msg, wait_msg
);
                  g_free(*primary_msg);
                  g_free(wait_msg);
                  *primary_msg = combined_msg;
              }
          }
          *secondary_msg = NULL((void*)0);
          *data = NULL((void*)0);
          g_free(buffer);

          return -1;
      }

      /* we got a valid message block from the child, process it */
      switch(indicator) {

      case SP_EXEC_FAILED'X':
          /*
           * Exec of dumpcap failed.  Get the errno for the failure.
           */
          if (!ws_strtoi32(buffer, NULL((void*)0), &exec_errno)) {
              ws_warning("Invalid errno: %s", buffer)do { if (1) { ws_log_full("Capture", LOG_LEVEL_WARNING, "capture/capture_sync.c"
, 1128, __func__, "Invalid errno: %s", buffer); } } while (0);
          }

          /*
           * Pick up the child status.
           */
          ret = sync_pipe_close_command(&data_pipe_read_fd, sync_pipe_read_io,
                                        &fork_child, &msg);
          if (ret == -1) {
              /*
               * Child process failed unexpectedly, or wait failed; msg is the
               * error message.
               */
              *primary_msg = msg;
              *secondary_msg = NULL((void*)0);
          } else {
              /*
               * Child process failed, but returned the expected exit status.
               * Return the messages it gave us, and indicate failure.
               */
              *primary_msg = ws_strdup_printf("Couldn't run dumpcap in child process: %s",wmem_strdup_printf(((void*)0), "Couldn't run dumpcap in child process: %s"
, g_strerror(exec_errno))
                                              g_strerror(exec_errno))wmem_strdup_printf(((void*)0), "Couldn't run dumpcap in child process: %s"
, g_strerror(exec_errno));
              *secondary_msg = NULL((void*)0);
              ret = -1;
          }
          *data = NULL((void*)0);
          break;

      case SP_ERROR_MSG'E':
          /*
           * Error from dumpcap; there will be a primary message and a
           * secondary message.
           */

          /* convert primary message */
          pipe_convert_header((unsigned char*)buffer, &indicator, &primary_msg_len);
          primary_msg_text = buffer+4;
          /* convert secondary message */
          pipe_convert_header((unsigned char*)primary_msg_text + primary_msg_len, &indicator,
                              &secondary_msg_len);
          secondary_msg_text = primary_msg_text + primary_msg_len + 4;
          /* the capture child will close the sync_pipe, nothing to do */

          /*
           * Pick up the child status.
           */
          ret = sync_pipe_close_command(&data_pipe_read_fd, sync_pipe_read_io,
                                        &fork_child, &msg);
          if (ret == -1) {
              /*
               * Child process failed unexpectedly, or wait failed; msg is the
               * error message.
               */
              *primary_msg = msg;
              *secondary_msg = NULL((void*)0);
          } else {
              /*
               * Child process failed, but returned the expected exit status.
               * Return the messages it gave us, and indicate failure.
               */
              *primary_msg = g_strdup(primary_msg_text)g_strdup_inline (primary_msg_text);
              *secondary_msg = g_strdup(secondary_msg_text)g_strdup_inline (secondary_msg_text);
              ret = -1;
          }
          *data = NULL((void*)0);
          break;

      case SP_BAD_FILTER'B': {
          uint32_t indx = 0;
          const char* end;

          if (ws_strtou32(buffer, &end, &indx) && end[0] == ':') {
              primary_msg_text = end + 1;
          } else {
              primary_msg_text = "dumpcap process returned a SP_BAD_FILTER without an error message";
          }
          /*
           * Pick up the child status.
           */
          ret = sync_pipe_close_command(&data_pipe_read_fd, sync_pipe_read_io,
                                        &fork_child, &msg);
          if (ret == -1) {
              /*
               * Child process failed unexpectedly, or wait failed; msg is the
               * error message.
               */
              *primary_msg = msg;
              *secondary_msg = NULL((void*)0);
          } else {
              /*
               * Child process failed, but returned the expected exit status.
               * Return the messages it gave us, and indicate failure.
               */
              *primary_msg = g_strdup(primary_msg_text)g_strdup_inline (primary_msg_text);
              *secondary_msg = NULL((void*)0);
              ret = -1;
          }
          *data = NULL((void*)0);
          break;
      }
      case SP_LOG_MSG'L':
          /*
           * Log from dumpcap; pass to our log
           */
          sync_pipe_handle_log_msg(buffer);
          break;

      case SP_SUCCESS'S':
          /* read the output from the command */
          data_buf = g_string_new("");
          while ((count = ws_readread(data_pipe_read_fd, buffer, PIPE_BUF_SIZE((512 * 1000)+4))) > 0) {
              buffer[count] = '\0';
              g_string_append(data_buf, buffer)(__builtin_constant_p (buffer) ? __extension__ ({ const char *
 const __val = (buffer); g_string_append_len_inline (data_buf
, __val, (__val != ((void*)0)) ? (gssize) strlen (((__val) + !
(__val))) : (gssize) -1); }) : g_string_append_len_inline (data_buf
, buffer, (gssize) -1));
          }

          /*
           * Pick up the child status.
           */
          ret = sync_pipe_close_command(&data_pipe_read_fd, sync_pipe_read_io,
                                        &fork_child, &msg);
          if (ret == -1) {
              /*
               * Child process failed unexpectedly, or wait failed; msg is the
               * error message.
               */
              *primary_msg = msg;
              *secondary_msg = NULL((void*)0);
              g_string_free(data_buf, TRUE)(__builtin_constant_p ((!(0))) ? (((!(0))) ? (g_string_free) (
(data_buf), ((!(0)))) : g_string_free_and_steal (data_buf)) :
 (g_string_free) ((data_buf), ((!(0)))));
              *data = NULL((void*)0);
          } else {
              /*
               * Child process succeeded.
               */
              *primary_msg = NULL((void*)0);
              *secondary_msg = NULL((void*)0);
              *data = g_string_free(data_buf, FALSE)(__builtin_constant_p ((0)) ? (((0)) ? (g_string_free) ((data_buf
), ((0))) : g_string_free_and_steal (data_buf)) : (g_string_free
) ((data_buf), ((0))));
          }
          break;

      default:
          /*
           * Pick up the child status.
           */
          ret = sync_pipe_close_command(&data_pipe_read_fd, sync_pipe_read_io,
                                        &fork_child, &msg);
          if (ret == -1) {
              /*
               * Child process failed unexpectedly, or wait failed; msg is the
               * error message.
               */
              *primary_msg = msg;
              *secondary_msg = NULL((void*)0);
          } else {
              /*
               * Child process returned an unknown status.
               */
              *primary_msg = ws_strdup_printf("dumpcap process gave an unexpected message type: 0x%02x",wmem_strdup_printf(((void*)0), "dumpcap process gave an unexpected message type: 0x%02x"
, indicator)
                                             indicator)wmem_strdup_printf(((void*)0), "dumpcap process gave an unexpected message type: 0x%02x"
, indicator);
              *secondary_msg = NULL((void*)0);
              ret = -1;
          }
          *data = NULL((void*)0);
          break;
      }
  } while (indicator != SP_SUCCESS'S' && ret != -1);

  g_free(buffer);
  return ret;
1296}

1298/* centralised logging and timing for sync_pipe_run_command_actual(),
1299* redirects to sync_pipe_run_command_actual()
1300*/
1301static int
1302sync_pipe_run_command(char **argv, char **data, char **primary_msg,
                    char **secondary_msg, void (*update_cb)(void))
1304{
  int ret, i;
  int64_t start_time;
  double elapsed;
  int logging_enabled;

  /* check if logging is actually enabled, otherwise don't expend the CPU generating logging */
  logging_enabled = ws_log_msg_is_active(WS_LOG_DOMAIN"Capture", LOG_LEVEL_INFO);
  if (logging_enabled) {
      start_time = g_get_monotonic_time();
      ws_debug("sync_pipe_run_command() starts")do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1314, __func__, "sync_pipe_run_command() starts"); } } while
 (0);
      for (i=0; argv[i] != 0; i++) {
          ws_noisy("  argv[%d]: %s", i, argv[i])do { if (1) { ws_log_full("Capture", LOG_LEVEL_NOISY, "capture/capture_sync.c"
, 1316, __func__, "  argv[%d]: %s", i, argv[i]); } } while (0
);
      }
  }
  /* do the actual sync pipe run command */
  ret = sync_pipe_run_command_actual(argv, data, primary_msg, secondary_msg, update_cb);

  if (logging_enabled) {
      elapsed = (g_get_monotonic_time() - start_time) / 1e6;

      ws_debug("sync_pipe_run_command() ends, taking %.3fs, result=%d", elapsed, ret)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1325, __func__, "sync_pipe_run_command() ends, taking %.3fs, result=%d"
, elapsed, ret); } } while (0);

  }
  return ret;
1329}


1332int
1333sync_interface_set_80211_chan(const char *iface, const char *freq, const char *type,
                            const char *center_freq1, const char *center_freq2,
                            char **data, char **primary_msg,
                            char **secondary_msg, void (*update_cb)(void))
1337{
  int argc, ret;
  char **argv;
  char *opt;

  argv = init_pipe_args(&argc);

  if (!argv) {
      *primary_msg = g_strdup("We don't know where to find dumpcap.")g_strdup_inline ("We don't know where to find dumpcap.");
      *secondary_msg = NULL((void*)0);
      *data = NULL((void*)0);
      return -1;
  }

  argv = sync_pipe_add_arg(argv, &argc, "-i");
  argv = sync_pipe_add_arg(argv, &argc, iface);

  if (center_freq2)
      opt = ws_strdup_printf("%s,%s,%s,%s", freq, type, center_freq1, center_freq2)wmem_strdup_printf(((void*)0), "%s,%s,%s,%s", freq, type, center_freq1
, center_freq2);
  else if (center_freq1)
      opt = ws_strdup_printf("%s,%s,%s", freq, type, center_freq1)wmem_strdup_printf(((void*)0), "%s,%s,%s", freq, type, center_freq1
);
  else if (type)
      opt = ws_strdup_printf("%s,%s", freq, type)wmem_strdup_printf(((void*)0), "%s,%s", freq, type);
  else
      opt = g_strdup(freq)g_strdup_inline (freq);

  argv = sync_pipe_add_arg(argv, &argc, "-k");
  argv = sync_pipe_add_arg(argv, &argc, opt);

  ret = sync_pipe_run_command(argv, data, primary_msg, secondary_msg, update_cb);
  g_free(opt);
  return ret;
1369}

1371/*
* Get the results of compiling a capture filter for an interface using dumpcap.
*
* On success, *data points to a buffer containing the dumpcap output,
* *primary_msg and *secondary_msg are NULL, and 0 is returned.  *data
* must be freed with g_free().
*
* On failure, *data is NULL, *primary_msg points to an error message,
* *secondary_msg either points to an additional error message or is
* NULL, and -1 is returned; *primary_msg, and *secondary_msg if not NULL,
* must be freed with g_free().
*/
1383int
1384sync_if_bpf_filter_open(const char *ifname, const char* filter, int linktype,
                      bool_Bool optimize, char **data, char **primary_msg,
                      char **secondary_msg, void (*update_cb)(void))
1387{
  int argc;
  char **argv;
  int ret;

  ws_debug("sync_if_bpf_filter_open")do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1392, __func__, "sync_if_bpf_filter_open"); } } while (0);

  const char* linktype_name = linktype_val_to_name(linktype);
  if (linktype != -1) { // Allow -1 for device default
      if (!linktype_name) {
          *primary_msg = g_strdup_printf("Unknown link-layer type %d.", linktype);
          *secondary_msg = NULL((void*)0);
          *data = NULL((void*)0);
          return -1;
      }
  }

  argv = init_pipe_args(&argc);

  if (!argv) {
      *primary_msg = g_strdup("We don't know where to find dumpcap.")g_strdup_inline ("We don't know where to find dumpcap.");
      *secondary_msg = NULL((void*)0);
      *data = NULL((void*)0);
      return -1;
  }

  /* Ask for the human-readable BPF code for the capture filter */
  argv = sync_pipe_add_arg(argv, &argc, "-d");
  argv = sync_pipe_add_arg(argv, &argc, "-i");
  argv = sync_pipe_add_arg(argv, &argc, ifname);
  if (linktype_name) {
      argv = sync_pipe_add_arg(argv, &argc, "-y");
      argv = sync_pipe_add_arg(argv, &argc, linktype_name);
  }
  if (!optimize) {
      argv = sync_pipe_add_arg(argv, &argc, "--no-optimize");
  }
  if (filter && strcmp(filter, "") != 0) {
      argv = sync_pipe_add_arg(argv, &argc, "-f");
      argv = sync_pipe_add_arg(argv, &argc, filter);
  }

  ret = sync_pipe_run_command(argv, data, primary_msg, secondary_msg, update_cb);
  return ret;
1431}

1433/*
* Get the list of interfaces using dumpcap.
*
* On success, *data points to a buffer containing the dumpcap output,
* *primary_msg and *secondary_msg are NULL, and 0 is returned.  *data
* must be freed with g_free().
*
* On failure, *data is NULL, *primary_msg points to an error message,
* *secondary_msg either points to an additional error message or is
* NULL, and -1 is returned; *primary_msg, and *secondary_msg if not NULL,
* must be freed with g_free().
*/
1445int
1446sync_interface_list_open(char **data, char **primary_msg,
                       char **secondary_msg, void (*update_cb)(void))
1448{
  int argc;
  char **argv;
  int ret;

  ws_debug("sync_interface_list_open")do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1453, __func__, "sync_interface_list_open"); } } while (0);

  argv = init_pipe_args(&argc);

  if (!argv) {
      *primary_msg = g_strdup("We don't know where to find dumpcap..")g_strdup_inline ("We don't know where to find dumpcap..");
      *secondary_msg = NULL((void*)0);
      *data = NULL((void*)0);
      return -1;
  }

  /* Ask for the interface list */
  argv = sync_pipe_add_arg(argv, &argc, "-D");

  ret = sync_pipe_run_command(argv, data, primary_msg, secondary_msg, update_cb);
  return ret;
1469}

1471/*
* Get the capabilities of an interface using dumpcap.
*
* On success, *data points to a buffer containing the dumpcap output,
* *primary_msg and *secondary_msg are NULL, and 0 is returned.  *data
* must be freed with g_free().
*
* On failure, *data is NULL, *primary_msg points to an error message,
* *secondary_msg either points to an additional error message or is
* NULL, and -1 is returned; *primary_msg, and *secondary_msg if not NULL,
* must be freed with g_free().
*/
1483int
1484sync_if_capabilities_open(const char *ifname, bool_Bool monitor_mode, const char* auth,
                        char **data, char **primary_msg,
                        char **secondary_msg, void (*update_cb)(void))
1487{
  int argc;
  char **argv;
  int ret;

  ws_debug("sync_if_capabilities_open")do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1492, __func__, "sync_if_capabilities_open"); } } while (0);

  argv = init_pipe_args(&argc);

  if (!argv) {
      *primary_msg = g_strdup("We don't know where to find dumpcap.")g_strdup_inline ("We don't know where to find dumpcap.");
      *secondary_msg = NULL((void*)0);
      *data = NULL((void*)0);
      return -1;
  }

  /* Ask for the interface capabilities */
  argv = sync_pipe_add_arg(argv, &argc, "-i");
  argv = sync_pipe_add_arg(argv, &argc, ifname);
  argv = sync_pipe_add_arg(argv, &argc, "-L");
  argv = sync_pipe_add_arg(argv, &argc, "--list-time-stamp-types");
  if (monitor_mode)
      argv = sync_pipe_add_arg(argv, &argc, "-I");
  if (auth) {
      argv = sync_pipe_add_arg(argv, &argc, "-A");
      argv = sync_pipe_add_arg(argv, &argc, auth);
  }

  ret = sync_pipe_run_command(argv, data, primary_msg, secondary_msg, update_cb);
  return ret;
1517}

1519int
1520sync_if_list_capabilities_open(GList *if_queries,
                        char **data, char **primary_msg,
                        char **secondary_msg, void (*update_cb)(void))
1523{
  int argc;
  char **argv;
  int ret;
  if_cap_query_t *if_cap_query;

  ws_debug("sync_if_list_capabilities_open")do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1529, __func__, "sync_if_list_capabilities_open"); } } while
 (0);

  argv = init_pipe_args(&argc);

  if (!argv) {
      *primary_msg = g_strdup("We don't know where to find dumpcap.")g_strdup_inline ("We don't know where to find dumpcap.");
      *secondary_msg = NULL((void*)0);
      *data = NULL((void*)0);
      return -1;
  }

  for (GList *li = if_queries; li != NULL((void*)0); li = g_list_next(li)((li) ? (((GList *)(li))->next) : ((void*)0))) {
      if_cap_query = (if_cap_query_t*)li->data;
      /* Ask for the interface capabilities */
      argv = sync_pipe_add_arg(argv, &argc, "-i");
      argv = sync_pipe_add_arg(argv, &argc, if_cap_query->name);
      if (if_cap_query->monitor_mode)
          argv = sync_pipe_add_arg(argv, &argc, "-I");
      if (if_cap_query->auth_username && if_cap_query->auth_password) {
          char sauth[256];
          argv = sync_pipe_add_arg(argv, &argc, "-A");
          snprintf(sauth, sizeof(sauth), "%s:%s",
                     if_cap_query->auth_username,
                     if_cap_query->auth_password);
          argv = sync_pipe_add_arg(argv, &argc, sauth);
      }
  }
  argv = sync_pipe_add_arg(argv, &argc, "-L");
  argv = sync_pipe_add_arg(argv, &argc, "--list-time-stamp-types");

  ret = sync_pipe_run_command(argv, data, primary_msg, secondary_msg, update_cb);
  return ret;
1561}

1563/*
* Start getting interface statistics using dumpcap.  On success, read_fd
* contains the file descriptor for the pipe's stdout, *msg is unchanged,
* and zero is returned.  On failure, *msg will point to an error message
* that must be g_free()d, and -1 will be returned.
* If data is not NULL, then it will also be set to point to a JSON
* serialization of the list of local interfaces and their capabilities.
*/
1571int
1572sync_interface_stats_open(int *data_read_fd, ws_process_id *fork_child, char **data, char **msg, void (*update_cb)(void))
1573{
  int argc;
  char **argv;
  int ret;
  GIOChannel *message_read_io;
  char *wait_msg;
  char *buffer = g_malloc(PIPE_BUF_SIZE((512 * 1000)+4) + 1);
  ssize_t nread;
  char indicator;
  int32_t exec_errno = 0;
  unsigned primary_msg_len;
  char *primary_msg_text;
  unsigned secondary_msg_len;
  /*char *secondary_msg_text;*/
  char *combined_msg;

  ws_debug("sync_interface_stats_open")do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1589, __func__, "sync_interface_stats_open"); } } while (0);

  argv = init_pipe_args(&argc);

  if (!argv) {
      *msg = g_strdup("We don't know where to find dumpcap.")g_strdup_inline ("We don't know where to find dumpcap.");
      g_free(buffer);
      return -1;
  }

  /* Ask for the interface statistics */
  argv = sync_pipe_add_arg(argv, &argc, "-S");

  /* If requested, ask for the interface list and capabilities. */
  if (data) {
      argv = sync_pipe_add_arg(argv, &argc, "-D");
      argv = sync_pipe_add_arg(argv, &argc, "-L");
  }

1608#ifndef DEBUG_CHILD
1609#ifdef _WIN32
  argv = sync_pipe_add_arg(argv, &argc, "--signal-pipe");
  ret = create_dummy_signal_pipe(msg);
  if (ret == -1) {
      g_free(buffer);
      return -1;
  }
  argv = sync_pipe_add_arg(argv, &argc, dummy_control_id);
1617#endif
1618#endif
  ret = sync_pipe_open_command(argv, data_read_fd, &message_read_io, NULL((void*)0),
                               fork_child, NULL((void*)0), msg, update_cb);
  if (ret == -1) {
      g_free(buffer);
      return -1;
  }

  /*
   * We were able to set up to read dumpcap's output.  Do so.
   *
   * First, wait for an SP_ERROR_MSG message or SP_SUCCESS message.
   */
  do {
      nread = pipe_read_block(message_read_io, &indicator, SP_MAX_MSG_LEN(512 * 1000),
                              buffer, msg);
      if(nread <= 0) {
          /* We got a read error from the sync pipe, or we got no data at
             all from the sync pipe, so we're not going to be getting any
             data or error message from the child process.  Pick up its
             exit status, and complain.

             We don't have to worry about killing the child, if the sync pipe
             returned an error. Usually this error is caused as the child killed
             itself while going down. Even in the rare cases that this isn't the
             case, the child will get an error when writing to the broken pipe
             the next time, cleaning itself up then. */
          g_io_channel_unref(message_read_io);
          ws_closeclose(*data_read_fd);
          ret = sync_pipe_wait_for_child(*fork_child, &wait_msg);
          if(nread == 0) {
              /* We got an EOF from the sync pipe.  That means that it exited
                 before giving us any data to read.  If ret is -1, we report
                 that as a bad exit (e.g., exiting due to a signal); otherwise,
                 we report it as a premature exit. */
              if (ret == -1)
                  *msg = wait_msg;
              else
                  *msg = g_strdup("Child dumpcap closed sync pipe prematurely")g_strdup_inline ("Child dumpcap closed sync pipe prematurely"
);
          } else {
              /* We got an error from the sync pipe.  If ret is -1, report
                 both the sync pipe I/O error and the wait error. */
              if (ret == -1) {
                  combined_msg = ws_strdup_printf("%s\n\n%s", *msg, wait_msg)wmem_strdup_printf(((void*)0), "%s\n\n%s", *msg, wait_msg);
                  g_free(*msg);
                  g_free(wait_msg);
                  *msg = combined_msg;
              }
          }
          g_free(buffer);
          return -1;
      }

      /* we got a valid message block from the child, process it */
      switch(indicator) {

      case SP_EXEC_FAILED'X':
          /*
           * Exec of dumpcap failed.  Get the errno for the failure.
           */
          if (!ws_strtoi32(buffer, NULL((void*)0), &exec_errno)) {
              ws_warning("Invalid errno: %s", buffer)do { if (1) { ws_log_full("Capture", LOG_LEVEL_WARNING, "capture/capture_sync.c"
, 1679, __func__, "Invalid errno: %s", buffer); } } while (0);
          }
          *msg = ws_strdup_printf("Couldn't run dumpcap in child process: %s",wmem_strdup_printf(((void*)0), "Couldn't run dumpcap in child process: %s"
, g_strerror(exec_errno))
                                  g_strerror(exec_errno))wmem_strdup_printf(((void*)0), "Couldn't run dumpcap in child process: %s"
, g_strerror(exec_errno));

          /*
           * Pick up the child status.
           */
          char *close_msg = NULL((void*)0);
          sync_pipe_close_command(data_read_fd, message_read_io,
                                  fork_child, &close_msg);
          /*
           * Ignore the error from sync_pipe_close_command, presumably the one
           * returned by the child is more pertinent to what went wrong.
           */
          g_free(close_msg);
          ret = -1;
          break;

      case SP_ERROR_MSG'E':
          /*
           * Error from dumpcap; there will be a primary message and a
           * secondary message.
           */

          /* convert primary message */
          pipe_convert_header((unsigned char*)buffer, &indicator, &primary_msg_len);
          primary_msg_text = buffer+4;
          /* convert secondary message */
          pipe_convert_header((unsigned char*)primary_msg_text + primary_msg_len, &indicator,
                              &secondary_msg_len);
          /*secondary_msg_text = primary_msg_text + primary_msg_len + 4;*/
          /* the capture child will close the sync_pipe, nothing to do */

          /*
           * Pick up the child status.
           */
          ret = sync_pipe_close_command(data_read_fd, message_read_io,
                                        fork_child, msg);
          if (ret == -1) {
              /*
               * Child process failed unexpectedly, or wait failed; msg is the
               * error message.
               */
          } else if (ret == WS_EXIT_NO_INTERFACES12) {
              /*
                  * No interfaces were found.  If that's not the
                  * result of an error when fetching the local
                  * interfaces, let the user know.
                  */
              *msg = g_strdup(primary_msg_text)g_strdup_inline (primary_msg_text);
          } else {
              /*
               * Child process failed, but returned the expected exit status.
               * Return the messages it gave us, and indicate failure.
               */
              *msg = g_strdup(primary_msg_text)g_strdup_inline (primary_msg_text);
              ret = -1;
          }
          g_free(buffer);
          return ret;

      case SP_LOG_MSG'L':
          /*
           * Log from dumpcap; pass to our log
           */
          sync_pipe_handle_log_msg(buffer);
          break;

      case SP_IFACE_LIST'I':
          /*
           * Dumpcap giving us the interface list
           */

          /* convert primary message */
          if (data) {
              *data = g_strdup(buffer)g_strdup_inline (buffer);
          }
          break;

      case SP_SUCCESS'S':
          /* Close the message pipe. */
          g_io_channel_unref(message_read_io);
          break;

      default:
          /*
           * Pick up the child status.
           */
          ret = sync_pipe_close_command(data_read_fd, message_read_io,
                                        fork_child, msg);
          if (ret == -1) {
              /*
               * Child process failed unexpectedly, or wait failed; msg is the
               * error message.
               */
          } else {
              /*
               * Child process returned an unknown status.
               */
              *msg = ws_strdup_printf("dumpcap process gave an unexpected message type: 0x%02x",wmem_strdup_printf(((void*)0), "dumpcap process gave an unexpected message type: 0x%02x"
, indicator)
                                     indicator)wmem_strdup_printf(((void*)0), "dumpcap process gave an unexpected message type: 0x%02x"
, indicator);
              ret = -1;
          }
          break;
      }
  } while (indicator != SP_SUCCESS'S' && ret != -1);

  g_free(buffer);
  return ret;
1789}

1791/* Close down the stats process */
1792int
1793sync_interface_stats_close(int *read_fd, ws_process_id *fork_child, char **msg)
1794{
1795#ifdef _WIN32
  CloseHandle(dummy_signal_pipe);
  dummy_signal_pipe = NULL((void*)0);
1798#else
  /*
   * Don't bother waiting for the child. sync_pipe_close_command
   * does this for us on Windows.
   */
  sync_pipe_kill(*fork_child);
1804#endif
  return sync_pipe_close_command(read_fd, NULL((void*)0), fork_child, msg);
1806}

1808/* read a number of bytes from a pipe */
1809/* (blocks until enough bytes read or an error occurs) */
1810static ssize_t
1811pipe_read_bytes(GIOChannel *pipe_io, char *bytes, size_t required, char **msg)
1812{
  GError *err = NULL((void*)0);
  size_t newly;
  size_t offset = 0;

  /* This should never happen, as "required" should be no greater than 2^24. */
  if (required > SSIZE_MAX9223372036854775807L) {
      ws_debug("read from pipe %p: bytes to read %zu > %zu", pipe_io, required, SSIZE_MAX)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1819, __func__, "read from pipe %p: bytes to read %zu > %zu"
, pipe_io, required, 9223372036854775807L); } } while (0);
      *msg = ws_strdup_printf("Error reading from sync pipe: bytes to read %zu > %zu", required, SSIZE_MAX)wmem_strdup_printf(((void*)0), "Error reading from sync pipe: bytes to read %zu > %zu"
, required, 9223372036854775807L);
      return -1;
  }
  while(required) {
      if (g_io_channel_read_chars(pipe_io, &bytes[offset], required, &newly, &err) == G_IO_STATUS_ERROR) {
          if (err != NULL((void*)0)) {
              ws_debug("read from pipe %p: error(%u): %s", pipe_io, err->code, err->message)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1826, __func__, "read from pipe %p: error(%u): %s", pipe_io
, err->code, err->message); } } while (0);
              *msg = ws_strdup_printf("Error reading from sync pipe: %s", err->message)wmem_strdup_printf(((void*)0), "Error reading from sync pipe: %s"
, err->message);
              g_clear_error(&err);
          } else {
              ws_debug("read from pipe %p: unknown error", pipe_io)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1830, __func__, "read from pipe %p: unknown error", pipe_io
); } } while (0);
              *msg = ws_strdup_printf("Error reading from sync pipe: unknown error")wmem_strdup_printf(((void*)0), "Error reading from sync pipe: unknown error"
);
          }
          return -1;
      }
      if (newly == 0) {
          /* EOF */
          ws_debug("read from pipe %p: EOF (capture closed?)", pipe_io)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1837, __func__, "read from pipe %p: EOF (capture closed?)",
 pipe_io); } } while (0);
          *msg = NULL((void*)0);
          /*
           * offset is, at this point, known to be less than the value of
           * required passed to us, which is guaranteed to fit in an ssize_t.
           */
          return (ssize_t)offset;
      }

      required -= newly;
      offset += newly;
  }

  /*
   * offset is, at this point, known to be equal to the value of
   * required passed to us, which is guaranteed to fit in an ssize_t.
   */
  *msg = NULL((void*)0);
  return (ssize_t)offset;
1856}

1858/*
* Read a line from a pipe; similar to fgets, but doesn't block.
*
* XXX - just stops reading if there's nothing to be read right now;
* that could conceivably mean that you don't get a complete line.
*/
1864int
1865sync_pipe_gets_nonblock(int pipe_fd, char *bytes, int max) {
  ssize_t newly;
  int offset = -1;

  while(offset < max - 1) {
      offset++;
      if (! ws_pipe_data_available(pipe_fd))
          break;
      newly = ws_readread(pipe_fd, &bytes[offset], 1);
      if (newly == 0) {
          /* EOF - not necessarily an error */
          break;
      } else if (newly == -1) {
          /* error */
          ws_debug("read from pipe %d: error(%u): %s", pipe_fd, errno, g_strerror(errno))do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1879, __func__, "read from pipe %d: error(%u): %s", pipe_fd
, (*__errno_location ()), g_strerror((*__errno_location ())))
; } } while (0);
          return -1;
      } else if (bytes[offset] == '\n') {
          break;
      }
  }

  if (offset >= 0)
      bytes[offset] = '\0';

  return offset;
1890}


1893/* convert header values (indicator and 3-byte length) */
1894static void
1895pipe_convert_header(const unsigned char *header, char *indicator, unsigned *block_len) {

  /* convert header values */
  *indicator = pntohu8(&header[0]);
  *block_len = pntohu24(&header[1]);
1900}

1902/* read a message from the sending pipe in the standard format
 (1-byte message indicator, 3-byte message length (excluding length
 and indicator field), and the rest is the message) */
1905static ssize_t
1906pipe_read_block(GIOChannel *pipe_io, char *indicator, unsigned len, char *msg,
              char **err_msg)
1908{
  unsigned required;
  ssize_t newly;
  char header[4];

  /* read header (indicator and 3-byte length) */
  newly = pipe_read_bytes(pipe_io, header, 4, err_msg);
  if(newly != 4) {
      if(newly != -1) {
          /*
           * Error; *err_msg has been set.
           */
          ws_debug("read %p got an error reading header: %s", pipe_io, *err_msg)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1920, __func__, "read %p got an error reading header: %s", pipe_io
, *err_msg); } } while (0);
          return -1;
      }
      if(newly == 0) {
          /*
           * Immediate EOF; if the capture child exits normally, this
           * is an "I'm done" indication, so don't report it as an
           * error.
           */
          ws_debug("read %p got an EOF reading header", pipe_io)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1929, __func__, "read %p got an EOF reading header", pipe_io
); } } while (0);
          return 0;
      }
      /*
       * Short read, but not an immediate EOF.
       */
      ws_debug("read %p got premature EOF reading header: %zd", pipe_io, newly)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1935, __func__, "read %p got premature EOF reading header: %zd"
, pipe_io, newly); } } while (0);
      *err_msg = ws_strdup_printf("Premature EOF reading from sync pipe: got only %zd bytes",wmem_strdup_printf(((void*)0), "Premature EOF reading from sync pipe: got only %zd bytes"
, newly)
                                  newly)wmem_strdup_printf(((void*)0), "Premature EOF reading from sync pipe: got only %zd bytes"
, newly);
      return -1;
  }

  /* convert header values */
  pipe_convert_header((unsigned char*)header, indicator, &required);

  /* only indicator with no value? */
  if(required == 0) {
      ws_debug("read %p indicator: %c empty value", pipe_io, *indicator)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1946, __func__, "read %p indicator: %c empty value", pipe_io
, *indicator); } } while (0);
      return 4;
  }

  /* does the data fit into the given buffer? */
  if(required > len) {
      size_t bytes_read;
      GError *err = NULL((void*)0);
      ws_debug("read %p length error, required %d > len %d, header: 0x%02x 0x%02x 0x%02x 0x%02x",do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1956, __func__, "read %p length error, required %d > len %d, header: 0x%02x 0x%02x 0x%02x 0x%02x"
, pipe_io, required, len, header[0], header[1], header[2], header
[3]); } } while (0)
            pipe_io, required, len,do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1956, __func__, "read %p length error, required %d > len %d, header: 0x%02x 0x%02x 0x%02x 0x%02x"
, pipe_io, required, len, header[0], header[1], header[2], header
[3]); } } while (0)
            header[0], header[1], header[2], header[3])do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1956, __func__, "read %p length error, required %d > len %d, header: 0x%02x 0x%02x 0x%02x 0x%02x"
, pipe_io, required, len, header[0], header[1], header[2], header
[3]); } } while (0);

      /* we have a problem here, try to read some more bytes from the pipe to debug where the problem really is */
      if (g_io_channel_read_chars(pipe_io, msg, len, &bytes_read, &err) == G_IO_STATUS_ERROR) {
          if (err != NULL((void*)0)) { /* error */
              ws_debug("read from pipe %p: error(%u): %s", pipe_io, err->code, err->message)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1961, __func__, "read from pipe %p: error(%u): %s", pipe_io
, err->code, err->message); } } while (0);
              g_clear_error(&err);
          } else {
              ws_debug("read from pipe %p: unknown error", pipe_io)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1964, __func__, "read from pipe %p: unknown error", pipe_io
); } } while (0);
          }
      }
      *err_msg = ws_strdup_printf("Message %c from dumpcap with length %d > buffer size %d! Partial message: %s",wmem_strdup_printf(((void*)0), "Message %c from dumpcap with length %d > buffer size %d! Partial message: %s"
, *indicator, required, len, msg)
                                  *indicator, required, len, msg)wmem_strdup_printf(((void*)0), "Message %c from dumpcap with length %d > buffer size %d! Partial message: %s"
, *indicator, required, len, msg);
      return -1;
  }
  len = required;

  /* read the actual block data */
  newly = pipe_read_bytes(pipe_io, msg, required, err_msg);
  if(newly == -1) {
      /*
       * Error; *err_msg has been set.
       */
      ws_debug("read %p got an error reading block data: %s", pipe_io, *err_msg)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1979, __func__, "read %p got an error reading block data: %s"
, pipe_io, *err_msg); } } while (0);
      return -1;
  }

  /*
   * newly is guaranteed to be >= 0 at this point, as pipe_read_bytes()
   * either returns -1 on an error, a positive value <= required on
   * a short read, or required on a non-short read.
   */
  if((size_t)newly != required) {
      *err_msg = ws_strdup_printf("Unknown message from dumpcap reading data, try to show it as a string: %s",wmem_strdup_printf(((void*)0), "Unknown message from dumpcap reading data, try to show it as a string: %s"
, msg)
                                  msg)wmem_strdup_printf(((void*)0), "Unknown message from dumpcap reading data, try to show it as a string: %s"
, msg);
      return -1;
  }

  /* XXX If message is "2part", the msg probably won't be sent to debug log correctly */
  ws_debug("read %p ok indicator: %c len: %u msg: %s", pipe_io, *indicator, len, msg)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 1995, __func__, "read %p ok indicator: %c len: %u msg: %s",
 pipe_io, *indicator, len, msg); } } while (0);
  *err_msg = NULL((void*)0);
  return newly + 4;
1998}


2001/* There's stuff to read from the sync pipe, meaning the child has sent
 us a message, or the sync pipe has closed, meaning the child has
 closed it (perhaps because it exited). */
2004static gboolean
2005sync_pipe_input_cb(GIOChannel *pipe_io, capture_session *cap_session)
2006{
  int  ret;
  char *buffer = g_malloc(SP_MAX_MSG_LEN(512 * 1000) + 1);
  ssize_t nread;
  char indicator;
  int32_t exec_errno = 0;
  int  primary_len;
  char *primary_msg;
  int  secondary_len;
  char *secondary_msg;
  char *wait_msg, *combined_msg;
  uint32_t npackets = 0;

  nread = pipe_read_block(pipe_io, &indicator, SP_MAX_MSG_LEN(512 * 1000), buffer,
                          &primary_msg);
  if(nread <= 0) {
      /* We got a read error, or a bad message, or an EOF, from the sync pipe.

         If we got a read error or a bad message, nread is -1 and
         primary_msg is set to point to an error message.  We don't
         have to worry about killing the child; usually this error
         is caused as the child killed  itself while going down.
         Even in the rare cases that this isn't the case, the child
         will get an error when writing to the broken pipe the next time,
         cleaning itself up then.

         If we got an EOF, nread is 0 and primary_msg isn't set.  This
         is an indication that the capture is finished. */
      ret = sync_pipe_wait_for_child(cap_session->fork_child, &wait_msg);
      if(nread == 0) {
          /* We got an EOF from the sync pipe.  That means that the capture
             child exited, and not in the middle of a message; we treat
             that as an indication that it's done, and only report an
             error if ret is -1, in which case wait_msg is the error
             message. */
          if (ret == -1)
              primary_msg = wait_msg;
      } else {
          /* We got an error from the sync pipe.  If ret is -1, report
             both the sync pipe I/O error and the wait error. */
          if (ret == -1) {
              combined_msg = ws_strdup_printf("%s\n\n%s", primary_msg, wait_msg)wmem_strdup_printf(((void*)0), "%s\n\n%s", primary_msg, wait_msg
);
              g_free(primary_msg);
              g_free(wait_msg);
              primary_msg = combined_msg;
          }
      }

      /* No more child process. */
      cap_session->fork_child = WS_INVALID_PID-1;
      cap_session->fork_child_status = ret;

2058#ifdef _WIN32
      ws_closeclose(cap_session->signal_pipe_write_fd);
2060#endif
      cap_session->capture_opts->closed_msg = primary_msg;
      if (extcap_session_stop(cap_session)) {
          capture_process_finished(cap_session);
      } else {
          extcap_request_stop(cap_session);
      }
      g_free(buffer);
      return false0;
  }

  /* we got a valid message block from the child, process it */
  switch(indicator) {
  case SP_FILE'F':
      if(!cap_session->new_file(cap_session, buffer)) {
          ws_debug("file failed, closing capture")do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 2075, __func__, "file failed, closing capture"); } } while (
0);

          /* We weren't able to open the new capture file; user has been
             alerted. The sync pipe will close after we return false. */

          /* The child has sent us a filename which we couldn't open.

             This could mean that the child is creating and deleting files
             (ring buffer mode) faster than we can handle it.

             That should only be the case for very fast file switches;
             We can't do much more than telling the child to stop.
             (This is the "emergency brake" if the user e.g. wants to
             switch files every second).

             This can also happen if the user specified "-", meaning
             "standard output", as the capture file. */
          sync_pipe_stop(cap_session);
          cap_session->closed(cap_session, NULL((void*)0));
          g_free(buffer);
          return false0;
      }
      break;
  case SP_PACKET_COUNT'P':
      if (!ws_strtou32(buffer, NULL((void*)0), &npackets)) {
          ws_warning("Invalid packets number: %s", buffer)do { if (1) { ws_log_full("Capture", LOG_LEVEL_WARNING, "capture/capture_sync.c"
, 2100, __func__, "Invalid packets number: %s", buffer); } } while
 (0);
      }
      ws_debug("new packets %u", npackets)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 2102, __func__, "new packets %u", npackets); } } while (0);
      cap_session->count += npackets;
      cap_session->new_packets(cap_session, npackets);
      break;
  case SP_EXEC_FAILED'X':
      /*
       * Exec of dumpcap failed.  Get the errno for the failure.
       */
      if (!ws_strtoi32(buffer, NULL((void*)0), &exec_errno)) {
          ws_warning("Invalid errno: %s", buffer)do { if (1) { ws_log_full("Capture", LOG_LEVEL_WARNING, "capture/capture_sync.c"
, 2111, __func__, "Invalid errno: %s", buffer); } } while (0);
      }
      primary_msg = ws_strdup_printf("Couldn't run dumpcap in child process: %s",wmem_strdup_printf(((void*)0), "Couldn't run dumpcap in child process: %s"
, g_strerror(exec_errno))
                                     g_strerror(exec_errno))wmem_strdup_printf(((void*)0), "Couldn't run dumpcap in child process: %s"
, g_strerror(exec_errno));
      cap_session->error(cap_session, primary_msg, NULL((void*)0));
      /* the capture child will close the sync_pipe, nothing to do for now */
      /* (an error message doesn't mean we have to stop capturing) */
      break;
  case SP_ERROR_MSG'E':
      /* convert primary message */
      pipe_convert_header((unsigned char*)buffer, &indicator, &primary_len);
      primary_msg = buffer+4;
      /* convert secondary message */
      pipe_convert_header((unsigned char*)primary_msg + primary_len, &indicator, &secondary_len);
      secondary_msg = primary_msg + primary_len + 4;
      /* message output */
      cap_session->error(cap_session, primary_msg, secondary_msg);
      /* the capture child will close the sync_pipe, nothing to do for now */
      /* (an error message doesn't mean we have to stop capturing) */
      break;
  case SP_LOG_MSG'L':
      /*
       * Log from dumpcap; pass to our log
       */
      sync_pipe_handle_log_msg(buffer);
      break;
  case SP_BAD_FILTER'B': {
      const char *message=NULL((void*)0);
      uint32_t indx = 0;
      const char* end;

      if (ws_strtou32(buffer, &end, &indx) && end[0] == ':') {
          message = end + 1;
      }

      cap_session->cfilter_error(cap_session, indx, message);
      /* the capture child will close the sync_pipe, nothing to do for now */
      break;
      }
  case SP_DROPS'D': {
      const char *name = NULL((void*)0);
      const char* end;
      uint32_t num = 0;

      if (ws_strtou32(buffer, &end, &num) && end[0] == ':') {
          name = end + 1;
      }

      cap_session->drops(cap_session, num, name);
      break;
      }
  default:
      if (g_ascii_isprint(indicator)((g_ascii_table[(guchar) (indicator)] & G_ASCII_PRINT) !=
 0))
          ws_warning("Unknown indicator '%c'", indicator)do { if (1) { ws_log_full("Capture", LOG_LEVEL_WARNING, "capture/capture_sync.c"
, 2164, __func__, "Unknown indicator '%c'", indicator); } } while
 (0);
      else
          ws_warning("Unknown indicator '\\x%02x", indicator)do { if (1) { ws_log_full("Capture", LOG_LEVEL_WARNING, "capture/capture_sync.c"
, 2166, __func__, "Unknown indicator '\\x%02x", indicator); }
 } while (0);
      break;
  }

  g_free(buffer);
  return true1;
2172}



2176/*
* dumpcap is exiting; wait for it to exit.  On success, *msgp is
* unchanged, and the exit status of dumpcap is returned.  On
* failure (which includes "dumpcap exited due to being killed by
* a signal or an exception"), *msgp points to an error message
* for the failure, and -1 is returned.  In the latter case, *msgp
* must be freed with g_free().
*/
2184static int
2185sync_pipe_wait_for_child(ws_process_id fork_child, char **msgp)
2186{
  int fork_child_status;
2188#ifndef _WIN32
  int retry_waitpid = 3;
2190#endif
  int ret = -1;
  int64_t start_time;
  double elapsed;

  start_time = g_get_monotonic_time();

  ws_debug("wait till child closed")do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 2197, __func__, "wait till child closed"); } } while (0);
  ws_assert(fork_child != WS_INVALID_PID)do { if ((1) && !(fork_child != -1)) ws_log_fatal_full
("Capture", LOG_LEVEL_ERROR, "capture/capture_sync.c", 2198, __func__
, "assertion failed: %s", "fork_child != -1"); } while (0);

  *msgp = NULL((void*)0); /* assume no error */
2201#ifdef _WIN32
  if (_cwait(&fork_child_status, (intptr_t) fork_child, _WAIT_CHILD) == -1) {
      *msgp = ws_strdup_printf("Error from cwait(): %s", g_strerror(errno))wmem_strdup_printf(((void*)0), "Error from cwait(): %s", g_strerror
((*__errno_location ())));
      ret = -1;
  } else {
      /*
       * The child exited; return its exit status.  Do not treat this as
       * an error.
       */
      ret = fork_child_status;
      if ((fork_child_status & 0xC0000000) == ERROR_SEVERITY_ERROR) {
          /* Probably an exception code */
          *msgp = ws_strdup_printf("Child dumpcap process died: %s",wmem_strdup_printf(((void*)0), "Child dumpcap process died: %s"
, win32strexception(fork_child_status))
                                  win32strexception(fork_child_status))wmem_strdup_printf(((void*)0), "Child dumpcap process died: %s"
, win32strexception(fork_child_status));
          ret = -1;
      }
  }
2218#else
  while (--retry_waitpid >= 0) {
      if (waitpid(fork_child, &fork_child_status, 0) != -1) {
          /* waitpid() succeeded */
          if (WIFEXITED(fork_child_status)(((fork_child_status) & 0x7f) == 0)) {
              /*
               * The child exited; return its exit status.  Do not treat this as
               * an error.
               */
              ret = WEXITSTATUS(fork_child_status)(((fork_child_status) & 0xff00) >> 8);
          } else if (WIFSTOPPED(fork_child_status)(((fork_child_status) & 0xff) == 0x7f)) {
              /* It stopped, rather than exiting.  "Should not happen." */
              *msgp = ws_strdup_printf("Child dumpcap process stopped: %s",wmem_strdup_printf(((void*)0), "Child dumpcap process stopped: %s"
, sync_pipe_signame((((fork_child_status) & 0xff00) >>
 8)))
                                      sync_pipe_signame(WSTOPSIG(fork_child_status)))wmem_strdup_printf(((void*)0), "Child dumpcap process stopped: %s"
, sync_pipe_signame((((fork_child_status) & 0xff00) >>
 8)));
              ret = -1;
          } else if (WIFSIGNALED(fork_child_status)(((signed char) (((fork_child_status) & 0x7f) + 1) >>
 1) > 0)) {
              /* It died with a signal. */
              *msgp = ws_strdup_printf("Child dumpcap process died: %s%s",wmem_strdup_printf(((void*)0), "Child dumpcap process died: %s%s"
, sync_pipe_signame(((fork_child_status) & 0x7f)), ((fork_child_status
) & 0x80) ? " - core dumped" : "")
                                      sync_pipe_signame(WTERMSIG(fork_child_status)),wmem_strdup_printf(((void*)0), "Child dumpcap process died: %s%s"
, sync_pipe_signame(((fork_child_status) & 0x7f)), ((fork_child_status
) & 0x80) ? " - core dumped" : "")
                                      WCOREDUMP(fork_child_status) ? " - core dumped" : "")wmem_strdup_printf(((void*)0), "Child dumpcap process died: %s%s"
, sync_pipe_signame(((fork_child_status) & 0x7f)), ((fork_child_status
) & 0x80) ? " - core dumped" : "");
              ret = -1;
          } else {
              /* What?  It had to either have exited, or stopped, or died with
                 a signal; what happened here? */
              *msgp = ws_strdup_printf("Bad status from waitpid(): %#o",wmem_strdup_printf(((void*)0), "Bad status from waitpid(): %#o"
, fork_child_status)
                                      fork_child_status)wmem_strdup_printf(((void*)0), "Bad status from waitpid(): %#o"
, fork_child_status);
              ret = -1;
          }
      } else {
          /* waitpid() failed */
          if (errno(*__errno_location ()) == EINTR4) {
              /*
               * Signal interrupted waitpid().
               *
               * If it's SIGALRM, we just want to keep waiting, in case
               * there's some timer using it (e.g., in a GUI toolkit).
               *
               * If you ^C TShark (or Wireshark), that should deliver
               * SIGINT to dumpcap as well.  dumpcap catches SIGINT,
               * and should clean up and exit, so we should eventually
               * see that and clean up and terminate.
               *
               * If we're sent a SIGTERM, we should (and do) catch it,
               * and TShark, at least, calls sync_pipe_stop(). which
               * kills dumpcap, so we should eventually see that and
               * clean up and terminate.
               */
              ws_warning("waitpid returned EINTR. retrying.")do { if (1) { ws_log_full("Capture", LOG_LEVEL_WARNING, "capture/capture_sync.c"
, 2265, __func__, "waitpid returned EINTR. retrying."); } } while
 (0);
              continue;
          } else if (errno(*__errno_location ()) == ECHILD10) {
              /*
               * The process identified by fork_child either doesn't
               * exist any more or isn't our child process (anymore?).
               *
               * echld might have already reaped the child.
               */
             ret = fetch_dumpcap_pid ? 0 : -1;
          } else {
              /* Unknown error. */
              *msgp = ws_strdup_printf("Error from waitpid(): %s", g_strerror(errno))wmem_strdup_printf(((void*)0), "Error from waitpid(): %s", g_strerror
((*__errno_location ())));
              ret = -1;
          }
      }
      break;
  }
2283#endif

  elapsed = (g_get_monotonic_time() - start_time) / 1e6;
  ws_debug("capture child closed after %.3fs", elapsed)do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 2286, __func__, "capture child closed after %.3fs", elapsed
); } } while (0);
  return ret;
2288}


2291#ifndef _WIN32
2292/* convert signal to corresponding name */
2293static const char *
2294sync_pipe_signame(int sig)
2295{
  const char *sigmsg;
  static char sigmsg_buf[6+1+3+1];

  switch (sig) {

  case SIGHUP1:
      sigmsg = "Hangup";
      break;

  case SIGINT2:
      sigmsg = "Interrupted";
      break;

  case SIGQUIT3:
      sigmsg = "Quit";
      break;

  case SIGILL4:
      sigmsg = "Illegal instruction";
      break;

  case SIGTRAP5:
      sigmsg = "Trace trap";
      break;

  case SIGABRT6:
      sigmsg = "Abort";
      break;

  case SIGFPE8:
      sigmsg = "Arithmetic exception";
      break;

  case SIGKILL9:
      sigmsg = "Killed";
      break;

  case SIGBUS7:
      sigmsg = "Bus error";
      break;

  case SIGSEGV11:
      sigmsg = "Segmentation violation";
      break;

      /* http://metalab.unc.edu/pub/Linux/docs/HOWTO/GCC-HOWTO
         Linux is POSIX compliant.  These are not POSIX-defined signals ---
         ISO/IEC 9945-1:1990 (IEEE Std 1003.1-1990), paragraph B.3.3.1.1 sez:

         ``The signals SIGBUS, SIGEMT, SIGIOT, SIGTRAP, and SIGSYS
         were omitted from POSIX.1 because their behavior is
         implementation dependent and could not be adequately catego-
         rized.  Conforming implementations may deliver these sig-
         nals, but must document the circumstances under which they
         are delivered and note any restrictions concerning their
         delivery.''

         So we only check for SIGSYS on those systems that happen to
         implement them (a system can be POSIX-compliant and implement
         them, it's just that POSIX doesn't *require* a POSIX-compliant
         system to implement them).
      */

2359#ifdef SIGSYS31
  case SIGSYS31:
      sigmsg = "Bad system call";
      break;
2363#endif

  case SIGPIPE13:
      sigmsg = "Broken pipe";
      break;

  case SIGALRM14:
      sigmsg = "Alarm clock";
      break;

  case SIGTERM15:
      sigmsg = "Terminated";
      break;

  default:
      /* Returning a static buffer is ok in the context we use it here */
      snprintf(sigmsg_buf, sizeof sigmsg_buf, "Signal %d", sig);
      sigmsg = sigmsg_buf;
      break;
  }
  return sigmsg;
2384}
2385#endif


2388#ifdef _WIN32

2390static int create_dummy_signal_pipe(char **msg) {
  char *dummy_signal_pipe_name;

  if (dummy_signal_pipe != NULL((void*)0)) return 0;

  if (!dummy_control_id) {
      dummy_control_id = ws_strdup_printf("%ld.dummy", GetCurrentProcessId())wmem_strdup_printf(((void*)0), "%ld.dummy", GetCurrentProcessId
());
  }

  /* Create the signal pipe */
  dummy_signal_pipe_name = ws_strdup_printf(SIGNAL_PIPE_FORMAT, dummy_control_id)wmem_strdup_printf(((void*)0), SIGNAL_PIPE_FORMAT, dummy_control_id
);
  dummy_signal_pipe = CreateNamedPipe(utf_8to16(dummy_signal_pipe_name),
                                PIPE_ACCESS_OUTBOUND, PIPE_TYPE_BYTE, 1, 65535, 65535, 0, NULL((void*)0));
  g_free(dummy_signal_pipe_name);
  if (dummy_signal_pipe == INVALID_HANDLE_VALUE) {
      *msg = ws_strdup_printf("Couldn't create signal pipe: %s",wmem_strdup_printf(((void*)0), "Couldn't create signal pipe: %s"
, win32strerror(GetLastError()))
          win32strerror(GetLastError()))wmem_strdup_printf(((void*)0), "Couldn't create signal pipe: %s"
, win32strerror(GetLastError()));
      return -1;
  }
  return 0;
2410}

2412/* tell the child through the signal pipe that we want to quit the capture */
2413static void
2414signal_pipe_capquit_to_child(capture_session *cap_session)
2415{
  const char quit_msg[] = "QUIT";
  int ret;

  ws_debug("signal_pipe_capquit_to_child")do { if (1) { ws_log_full("Capture", LOG_LEVEL_DEBUG, "capture/capture_sync.c"
, 2419, __func__, "signal_pipe_capquit_to_child"); } } while (
0);

  /* it doesn't matter *what* we send here, the first byte will stop the capture */
  /* simply sending a "QUIT" string */
  /*sync_pipe_write_string_msg(cap_session->signal_pipe_write_fd, SP_QUIT, quit_msg);*/
  ret = ws_writewrite(cap_session->signal_pipe_write_fd, quit_msg, sizeof quit_msg);
  if(ret == -1) {
      ws_warning("%d header: error %s", cap_session->signal_pipe_write_fd, win32strerror(GetLastError()))do { if (1) { ws_log_full("Capture", LOG_LEVEL_WARNING, "capture/capture_sync.c"
, 2426, __func__, "%d header: error %s", cap_session->signal_pipe_write_fd
, win32strerror(GetLastError())); } } while (0);
  }
2428}
2429#endif


2432/* user wants to stop the capture run */
2433void
2434sync_pipe_stop(capture_session *cap_session)
2435{
  if (cap_session->fork_child != WS_INVALID_PID-1) {
2437#ifndef _WIN32
      /* send the SIGINT signal to close the capture child gracefully. */
      int sts = kill(cap_session->fork_child, SIGINT2);
      if (sts != 0) {
          ws_warning("Sending SIGINT to child failed: %s\n", g_strerror(errno))do { if (1) { ws_log_full("Capture", LOG_LEVEL_WARNING, "capture/capture_sync.c"
, 2441, __func__, "Sending SIGINT to child failed: %s\n", g_strerror
((*__errno_location ()))); } } while (0);
      }
2443#else
2444#define STOP_SLEEP_TIME 500 /* ms */
      DWORD status;

      /* First, use the special signal pipe to try to close the capture child
       * gracefully.
       */
      signal_pipe_capquit_to_child(cap_session);

      /* Next, wait for the process to exit on its own */
      status = WaitForSingleObject((HANDLE) cap_session->fork_child, STOP_SLEEP_TIME);

      /* Force the issue. */
      if (status != WAIT_OBJECT_0) {
          ws_warning("sync_pipe_stop: forcing child to exit")do { if (1) { ws_log_full("Capture", LOG_LEVEL_WARNING, "capture/capture_sync.c"
, 2457, __func__, "sync_pipe_stop: forcing child to exit"); }
 } while (0);
          sync_pipe_kill(cap_session->fork_child);
      }
2460#endif
  }
2462}


2465/* Wireshark has to exit, force the capture child to close */
2466void
2467sync_pipe_kill(ws_process_id fork_child)
2468{
  if (fork_child != WS_INVALID_PID-1) {
2470#ifndef _WIN32
      int sts = kill(fork_child, SIGTERM15);    /* SIGTERM so it can clean up if necessary */
      if (sts != 0) {
          ws_warning("Sending SIGTERM to child failed: %s\n", g_strerror(errno))do { if (1) { ws_log_full("Capture", LOG_LEVEL_WARNING, "capture/capture_sync.c"
, 2473, __func__, "Sending SIGTERM to child failed: %s\n", g_strerror
((*__errno_location ()))); } } while (0);
      }
2475#else
      /* Remark: This is not the preferred method of closing a process!
       * the clean way would be getting the process id of the child process,
       * then getting window handle hWnd of that process (using EnumChildWindows),
       * and then do a SendMessage(hWnd, WM_CLOSE, 0, 0)
       *
       * Unfortunately, I don't know how to get the process id from the
       * handle.  OpenProcess will get an handle (not a window handle)
       * from the process ID; it will not get a window handle from the
       * process ID.  (How could it?  A process can have more than one
       * window.  For that matter, a process might have *no* windows,
       * as a process running dumpcap, the normal child process program,
       * probably does.)
       *
       * Hint: GenerateConsoleCtrlEvent() will only work if both processes are
       * running in the same console; that's not necessarily the case for
       * us, as we might not be running in a console.
       * And this also will require to have the process id.
       */
      TerminateProcess((HANDLE) (fork_child), 0);

2496#endif
  }
2498}

2500void capture_sync_set_fetch_dumpcap_pid_cb(void(*cb)(ws_process_id pid)) {
  fetch_dumpcap_pid = cb;
2502}

2504#endif /* HAVE_LIBPCAP */