/* capture_sync.c * Synchronisation between Ethereal capture parent and child instances * * $Id$ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #ifdef HAVE_LIBPCAP #include #include #include #include #include #ifdef HAVE_UNISTD_H #include #endif #include #ifdef HAVE_SYS_WAIT_H # include #endif #ifndef _WIN32 /* * Define various POSIX macros (and, in the case of WCOREDUMP, non-POSIX * macros) on UNIX systems that don't have them. */ #ifndef WIFEXITED # define WIFEXITED(status) (((status) & 0177) == 0) #endif #ifndef WIFSTOPPED # define WIFSTOPPED(status) (((status) & 0177) == 0177) #endif #ifndef WIFSIGNALED # define WIFSIGNALED(status) (!WIFSTOPPED(status) && !WIFEXITED(status)) #endif #ifndef WEXITSTATUS # define WEXITSTATUS(status) ((status) >> 8) #endif #ifndef WTERMSIG # define WTERMSIG(status) ((status) & 0177) #endif #ifndef WCOREDUMP # define WCOREDUMP(status) ((status) & 0200) #endif #ifndef WSTOPSIG # define WSTOPSIG(status) ((status) >> 8) #endif #endif /* _WIN32 */ #include #include #include "globals.h" #include "file.h" #include #include "capture.h" #include "capture_sync.h" #include "simple_dialog.h" #ifdef _WIN32 #include "capture-wpcap.h" #endif #include "ui_util.h" #include "file_util.h" #include "log.h" #ifdef _WIN32 #include /* For spawning child process */ #endif #ifndef _WIN32 static const char *sync_pipe_signame(int); #endif static gboolean sync_pipe_input_cb(gint source, gpointer user_data); static void sync_pipe_wait_for_child(capture_options *capture_opts); /* * Maximum length of sync pipe message data. Must be < 2^24, as the * message length is 3 bytes. * XXX - this must be large enough to handle a Really Big Filter * Expression, as the error message for an incorrect filter expression * is a bit larger than the filter expression. */ #define SP_MAX_MSG_LEN 4096 /* write a message to the recipient pipe in the standard format (3 digit message length (excluding length and indicator field), 1 byte message indicator and the rest is the message) */ static void pipe_write_block(int pipe, char indicator, int len, const char *msg) { guchar header[3+1]; /* indicator + 3-byte len */ int ret; /*g_warning("write %d enter", pipe);*/ g_assert(indicator < '0' || indicator > '9'); g_assert(len <= SP_MAX_MSG_LEN); /* write header (indicator + 3-byte len) */ header[0] = indicator; header[1] = (len >> 16) & 0xFF; header[2] = (len >> 8) & 0xFF; header[3] = (len >> 0) & 0xFF; ret = write(pipe, header, sizeof header); if(ret == -1) { return; } /* write value (if we have one) */ if(len) { /*g_warning("write %d indicator: %c value len: %u msg: %s", pipe, indicator, len, msg);*/ ret = write(pipe, msg, len); if(ret == -1) { return; } } else { /*g_warning("write %d indicator: %c no value", pipe, indicator);*/ } /*g_warning("write %d leave", pipe);*/ } /* 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) */ static int pipe_read_block(int pipe, char *indicator, int len, char *msg) { int required; int newly; guchar header[4]; int offset; /* read header (indicator and 3-byte length) */ required = 4; offset = 0; while(required) { newly = read(pipe, &header[offset], required); if (newly == 0) { /* EOF */ /*g_warning("read %d header empty (capture closed)", pipe);*/ return newly; } if (newly < 0) { /* error */ /*g_warning("read %d header error: %s", pipe, strerror(errno));*/ return newly; } required -= newly; offset += newly; } /* convert header values */ *indicator = header[0]; required = header[1]<<16 | header[2]<<8 | header[3]; /* only indicator with no value? */ if(required == 0) { /*g_warning("read %d indicator: %c empty value", pipe, *indicator);*/ return 4; } g_assert(required <= len); len = required; /* read value */ offset = 0; while(required) { newly = read(pipe, &msg[offset], required); if (newly == -1) { /* error */ /*g_warning("read %d value error, indicator: %u", pipe, *indicator);*/ return newly; } required -= newly; offset += newly; } /*g_warning("read %d ok indicator: %c len: %u msg: %s", pipe, *indicator, len, msg);*/ return len + 4; } void sync_pipe_packet_count_to_parent(int packet_count) { char tmp[SP_DECISIZE+1+1]; g_snprintf(tmp, sizeof(tmp), "%d", packet_count); g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "sync_pipe_packet_count_to_parent: %s", tmp); pipe_write_block(1, SP_PACKET_COUNT, strlen(tmp)+1, tmp); } void sync_pipe_filename_to_parent(const char *filename) { g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "sync_pipe_filename_to_parent: %s", filename); pipe_write_block(1, SP_FILE, strlen(filename)+1, filename); } void sync_pipe_errmsg_to_parent(const char *errmsg) { g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "sync_pipe_errmsg_to_parent: %s", errmsg); pipe_write_block(1, SP_ERROR_MSG, strlen(errmsg)+1, errmsg); } void sync_pipe_drops_to_parent(int drops) { char tmp[SP_DECISIZE+1+1]; g_snprintf(tmp, sizeof(tmp), "%d", drops); g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "sync_pipe_drops_to_parent: %s", tmp); pipe_write_block(1, SP_DROPS, strlen(tmp)+1, tmp); } #ifdef _WIN32 static void signal_pipe_capquit_to_child(capture_options *capture_opts) { g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "signal_pipe_capquit_to_child"); pipe_write_block(capture_opts->signal_pipe_fd, SP_QUIT, 0, NULL); } #endif /* Add a string pointer to a NULL-terminated array of string pointers. */ static const char ** sync_pipe_add_arg(const char **args, int *argc, const char *arg) { /* 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 = g_realloc( (gpointer) args, (*argc + 2) * sizeof (char *)); /* Stuff the pointer into the penultimate element of the array, which is the one at the index specified by "*argc". */ args[*argc] = arg; /* Now bump the count. */ (*argc)++; /* We overwrite the NULL pointer; put it back right after the element we added. */ args[*argc] = NULL; return args; } #define ARGV_NUMBER_LEN 24 gboolean sync_pipe_start(capture_options *capture_opts) { char ssnap[ARGV_NUMBER_LEN]; char scount[ARGV_NUMBER_LEN]; char sfilesize[ARGV_NUMBER_LEN]; char sfile_duration[ARGV_NUMBER_LEN]; char sring_num_files[ARGV_NUMBER_LEN]; char sautostop_files[ARGV_NUMBER_LEN]; char sautostop_filesize[ARGV_NUMBER_LEN]; char sautostop_duration[ARGV_NUMBER_LEN]; #ifdef _WIN32 char buffer_size[ARGV_NUMBER_LEN]; char sync_pipe_fd[ARGV_NUMBER_LEN]; char signal_pipe_fd[ARGV_NUMBER_LEN]; char *filterstring; char *savefilestring; int signal_pipe[2]; /* pipe used to send messages from parent to child (currently only stop) */ #else char errmsg[1024+1]; #endif int argc; const char **argv; enum PIPES { PIPE_READ, PIPE_WRITE }; /* Constants 0 and 1 for PIPE_READ and PIPE_WRITE */ int sync_pipe[2]; /* pipe used to send messages from child to parent */ g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "sync_pipe_start"); capture_opts_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, capture_opts); capture_opts->fork_child = -1; /* Allocate the string pointer array with enough space for the terminating NULL pointer. */ argc = 0; argv = g_malloc(sizeof (char *)); *argv = NULL; /* Now add those arguments used on all platforms. */ argv = sync_pipe_add_arg(argv, &argc, CHILD_NAME); argv = sync_pipe_add_arg(argv, &argc, "-i"); argv = sync_pipe_add_arg(argv, &argc, capture_opts->iface); if (capture_opts->has_snaplen) { argv = sync_pipe_add_arg(argv, &argc, "-s"); g_snprintf(ssnap, ARGV_NUMBER_LEN, "%d",capture_opts->snaplen); argv = sync_pipe_add_arg(argv, &argc, ssnap); } if (capture_opts->linktype != -1) { argv = sync_pipe_add_arg(argv, &argc, "-y"); #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME g_snprintf(ssnap, ARGV_NUMBER_LEN, "%s",pcap_datalink_val_to_name(capture_opts->linktype)); #else /* XXX - just treat it as a number */ g_snprintf(ssnap, ARGV_NUMBER_LEN, "%d",capture_opts->linktype); #endif argv = sync_pipe_add_arg(argv, &argc, ssnap); } if(capture_opts->multi_files_on) { if (capture_opts->has_autostop_filesize) { argv = sync_pipe_add_arg(argv, &argc, "-b"); g_snprintf(sfilesize, ARGV_NUMBER_LEN, "filesize:%d",capture_opts->autostop_filesize); argv = sync_pipe_add_arg(argv, &argc, sfilesize); } if (capture_opts->has_file_duration) { argv = sync_pipe_add_arg(argv, &argc, "-b"); g_snprintf(sfile_duration, ARGV_NUMBER_LEN, "duration:%d",capture_opts->file_duration); argv = sync_pipe_add_arg(argv, &argc, sfile_duration); } if (capture_opts->has_ring_num_files) { argv = sync_pipe_add_arg(argv, &argc, "-b"); g_snprintf(sring_num_files, ARGV_NUMBER_LEN, "files:%d",capture_opts->ring_num_files); argv = sync_pipe_add_arg(argv, &argc, sring_num_files); } if (capture_opts->has_autostop_files) { argv = sync_pipe_add_arg(argv, &argc, "-a"); g_snprintf(sautostop_files, ARGV_NUMBER_LEN, "files:%d",capture_opts->autostop_files); argv = sync_pipe_add_arg(argv, &argc, sautostop_files); } } else { if (capture_opts->has_autostop_filesize) { argv = sync_pipe_add_arg(argv, &argc, "-a"); g_snprintf(sautostop_filesize, ARGV_NUMBER_LEN, "filesize:%d",capture_opts->autostop_filesize); argv = sync_pipe_add_arg(argv, &argc, sautostop_filesize); } } if (capture_opts->has_autostop_packets) { argv = sync_pipe_add_arg(argv, &argc, "-c"); g_snprintf(scount, ARGV_NUMBER_LEN, "%d",capture_opts->autostop_packets); argv = sync_pipe_add_arg(argv, &argc, scount); } if (capture_opts->has_autostop_duration) { argv = sync_pipe_add_arg(argv, &argc, "-a"); g_snprintf(sautostop_duration, ARGV_NUMBER_LEN, "duration:%d",capture_opts->autostop_duration); argv = sync_pipe_add_arg(argv, &argc, sautostop_duration); } if (!capture_opts->promisc_mode) argv = sync_pipe_add_arg(argv, &argc, "-p"); #ifdef _WIN32 /* Create a pipe for the child process */ /* (inrease this value if you have trouble while fast capture file switches) */ if(_pipe(sync_pipe, 5120, O_BINARY) < 0) { /* Couldn't create the pipe between parent and child. */ simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Couldn't create sync pipe: %s", strerror(errno)); g_free( (gpointer) argv); return FALSE; } /* Create a pipe for the parent process */ if(_pipe(signal_pipe, 512, O_BINARY) < 0) { /* Couldn't create the signal pipe between parent and child. */ simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Couldn't create signal pipe: %s", strerror(errno)); eth_close(sync_pipe[PIPE_READ]); eth_close(sync_pipe[PIPE_WRITE]); g_free( (gpointer) argv); return FALSE; } capture_opts->signal_pipe_fd = signal_pipe[PIPE_WRITE]; argv = sync_pipe_add_arg(argv, &argc, "-B"); g_snprintf(buffer_size, ARGV_NUMBER_LEN, "%d",capture_opts->buffer_size); argv = sync_pipe_add_arg(argv, &argc, buffer_size); /* Convert sync pipe write handle to a string and pass to child */ argv = sync_pipe_add_arg(argv, &argc, "-Z"); g_snprintf(sync_pipe_fd, ARGV_NUMBER_LEN, "sync:%d",sync_pipe[PIPE_WRITE]); argv = sync_pipe_add_arg(argv, &argc, sync_pipe_fd); /* Convert signal pipe read handle to a string and pass to child */ argv = sync_pipe_add_arg(argv, &argc, "-Z"); g_snprintf(signal_pipe_fd, ARGV_NUMBER_LEN, "signal:%d",signal_pipe[PIPE_READ]); argv = sync_pipe_add_arg(argv, &argc, signal_pipe_fd); /* Convert filter string to a quote delimited string and pass to child */ filterstring = NULL; if (capture_opts->cfilter != NULL && strlen(capture_opts->cfilter) != 0) { argv = sync_pipe_add_arg(argv, &argc, "-f"); filterstring = g_strdup_printf("\"%s\"", capture_opts->cfilter); argv = sync_pipe_add_arg(argv, &argc, filterstring); } /* Convert save file name to a quote delimited string and pass to child */ savefilestring = NULL; if(capture_opts->save_file) { argv = sync_pipe_add_arg(argv, &argc, "-w"); savefilestring = g_strdup_printf("\"%s\"", capture_opts->save_file); argv = sync_pipe_add_arg(argv, &argc, savefilestring); } /* Spawn process */ #if 0 { /* XXX - experiment to use dumpcap as the capture child */ /* currently not working, so commented out for now ... */ char *dirname; char *exename; /* take the ethereal programs path and replace ethereal with dumpcap */ dirname = get_dirname(g_strdup(ethereal_path)); exename = g_strdup_printf("%s" G_DIR_SEPARATOR_S "dumpcap", dirname); g_free(dirname); /* call dumpcap */ capture_opts->fork_child = spawnvp(_P_NOWAIT, exename, argv); g_free(exename); } #endif capture_opts->fork_child = spawnvp(_P_NOWAIT, ethereal_path, argv); if (filterstring) { g_free(filterstring); } if(savefilestring) { g_free(savefilestring); } /* child own's the read side now, close our handle */ eth_close(signal_pipe[PIPE_READ]); #else if (pipe(sync_pipe) < 0) { /* Couldn't create the pipe between parent and child. */ simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Couldn't create sync pipe: %s", strerror(errno)); g_free(argv); return FALSE; } if (capture_opts->cfilter != NULL && capture_opts->cfilter != 0) { argv = sync_pipe_add_arg(argv, &argc, "-f"); argv = sync_pipe_add_arg(argv, &argc, capture_opts->cfilter); } if(capture_opts->save_file) { argv = sync_pipe_add_arg(argv, &argc, "-w"); argv = sync_pipe_add_arg(argv, &argc, capture_opts->save_file); } if ((capture_opts->fork_child = fork()) == 0) { /* * Child process - run Ethereal with the right arguments to make * it just pop up the live capture dialog box and capture with * the specified capture parameters, writing to the specified file. * * args: -i interface specification * -w file to write * -c count to capture * -s snaplen * -m / -b fonts * -f "filter expression" */ eth_close(1); dup(sync_pipe[PIPE_WRITE]); eth_close(sync_pipe[PIPE_READ]); execvp(ethereal_path, argv); g_snprintf(errmsg, sizeof errmsg, "Couldn't run %s in child process: %s", ethereal_path, strerror(errno)); sync_pipe_errmsg_to_parent(errmsg); /* 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). */ _exit(2); } #endif /* Parent process - read messages from the child process over the sync pipe. */ g_free( (gpointer) argv); /* free up arg array */ /* Close the write side of the pipe, so that only the child has it open, and thus it completely closes, and thus returns to us an EOF indication, if the child closes it (either deliberately or by exiting abnormally). */ eth_close(sync_pipe[PIPE_WRITE]); if (capture_opts->fork_child == -1) { /* We couldn't even create the child process. */ simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Couldn't create child process: %s", strerror(errno)); eth_close(sync_pipe[PIPE_READ]); #ifdef _WIN32 eth_close(signal_pipe[PIPE_WRITE]); #endif return FALSE; } /* we might wait for a moment till child is ready, so update screen now */ main_window_update(); /* 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 */ pipe_input_set_handler(sync_pipe[PIPE_READ], (gpointer) capture_opts, &capture_opts->fork_child, sync_pipe_input_cb); return TRUE; } /* 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). */ static gboolean sync_pipe_input_cb(gint source, gpointer user_data) { capture_options *capture_opts = (capture_options *)user_data; char buffer[SP_MAX_MSG_LEN+1]; int nread; char indicator; nread = pipe_read_block(source, &indicator, SP_MAX_MSG_LEN, buffer); if(nread <= 0) { g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "sync_pipe_input_cb: child has closed sync_pipe"); /* The child has closed the sync pipe, meaning it's not going to be capturing any more packets. Pick up its exit status, and complain if it did anything other than exit with status 0. */ sync_pipe_wait_for_child(capture_opts); #ifdef _WIN32 eth_close(capture_opts->signal_pipe_fd); #endif capture_input_closed(capture_opts); return FALSE; } switch(indicator) { case SP_FILE: if(!capture_input_new_file(capture_opts, buffer)) { g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "sync_pipe_input_cb: file failed, closing capture"); /* We weren't able to open the new capture file; user has been alerted. Close the sync pipe. */ eth_close(source); /* the child has send us a filename which we couldn't open. this probably means, the child is creating files faster than we can handle it. this 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 user e.g. wants to switch files every second) */ sync_pipe_stop(capture_opts); } break; case SP_PACKET_COUNT: nread = atoi(buffer); g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "sync_pipe_input_cb: new packets %u", nread); capture_input_new_packets(capture_opts, nread); break; case SP_ERROR_MSG: capture_input_error_message(capture_opts, buffer); /* the capture child will close the sync_pipe, nothing to do for now */ break; case SP_DROPS: capture_input_drops(capture_opts, atoi(buffer)); break; default: g_assert_not_reached(); } return TRUE; } /* the child process is going down, wait until it's completely terminated */ static void sync_pipe_wait_for_child(capture_options *capture_opts) { int wstatus; g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "sync_pipe_wait_for_child: wait till child closed"); g_assert(capture_opts->fork_child != -1); #ifdef _WIN32 /* XXX - analyze the wait status and display more information in the dialog box? XXX - set "fork_child" to -1 if we find it exited? */ if (_cwait(&wstatus, capture_opts->fork_child, _WAIT_CHILD) == -1) { simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Child capture process stopped unexpectedly"); } #else if (wait(&wstatus) != -1) { if (WIFEXITED(wstatus)) { /* The child exited; display its exit status, if it seems uncommon (0=ok, 1=error) */ /* the child will inform us about errors through the sync_pipe, which will popup */ /* an error message, so don't popup another one */ /* XXX - if there are situations where the child won't send us such an error message, */ /* this should be fixed in the child and not here! */ if (WEXITSTATUS(wstatus) != 0 && WEXITSTATUS(wstatus) != 1) { simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Child capture process exited: exit status %d", WEXITSTATUS(wstatus)); } } else if (WIFSTOPPED(wstatus)) { /* It stopped, rather than exiting. "Should not happen." */ simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Child capture process stopped: %s", sync_pipe_signame(WSTOPSIG(wstatus))); } else if (WIFSIGNALED(wstatus)) { /* It died with a signal. */ simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Child capture process died: %s%s", sync_pipe_signame(WTERMSIG(wstatus)), WCOREDUMP(wstatus) ? " - core dumped" : ""); } else { /* What? It had to either have exited, or stopped, or died with a signal; what happened here? */ simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "Child capture process died: wait status %#o", wstatus); } } /* No more child process. */ capture_opts->fork_child = -1; #endif g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "sync_pipe_wait_for_child: capture child closed"); } #ifndef _WIN32 /* convert signal to corresponding name */ static const char * sync_pipe_signame(int sig) { const char *sigmsg; static char sigmsg_buf[6+1+3+1]; switch (sig) { case SIGHUP: sigmsg = "Hangup"; break; case SIGINT: sigmsg = "Interrupted"; break; case SIGQUIT: sigmsg = "Quit"; break; case SIGILL: sigmsg = "Illegal instruction"; break; case SIGTRAP: sigmsg = "Trace trap"; break; case SIGABRT: sigmsg = "Abort"; break; case SIGFPE: sigmsg = "Arithmetic exception"; break; case SIGKILL: sigmsg = "Killed"; break; case SIGBUS: sigmsg = "Bus error"; break; case SIGSEGV: 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). */ #ifdef SIGSYS case SIGSYS: sigmsg = "Bad system call"; break; #endif case SIGPIPE: sigmsg = "Broken pipe"; break; case SIGALRM: sigmsg = "Alarm clock"; break; case SIGTERM: sigmsg = "Terminated"; break; default: /* XXX - returning a static buffer is ok in the context we use it here */ g_snprintf(sigmsg_buf, sizeof sigmsg_buf, "Signal %d", sig); sigmsg = sigmsg_buf; break; } return sigmsg; } #endif /* user wants to stop the capture run */ void sync_pipe_stop(capture_options *capture_opts) { /* XXX - in which cases this will be 0? */ if (capture_opts->fork_child != -1 && capture_opts->fork_child != 0) { #ifndef _WIN32 /* send the SIGUSR1 signal to close the capture child gracefully. */ kill(capture_opts->fork_child, SIGUSR1); #else /* Win32 doesn't have the kill() system call, use the special signal pipe instead to close the capture child gracefully. */ signal_pipe_capquit_to_child(capture_opts); #endif } } /* Ethereal has to exit, force the capture child to close */ void sync_pipe_kill(capture_options *capture_opts) { /* XXX - in which cases this will be 0? */ if (capture_opts->fork_child != -1 && capture_opts->fork_child != 0) { #ifndef _WIN32 kill(capture_opts->fork_child, SIGTERM); /* SIGTERM so it can clean up if necessary */ #else /* XXX: 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.) * * 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) (capture_opts->fork_child), 0); #endif } } #endif /* HAVE_LIBPCAP */