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wireshark/echld/dispatcher.c

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/* echld_dispatcher.c
* epan working child API internals
* Dispatcher process routines and definitions
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Copyright (c) 2013 by Luis Ontanon <luis@ontanon.org>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "echld-int.h"
/**
DISPATCHER
**/
struct dispatcher_child {
echld_chld_id_t chld_id;
child_state_t state;
echld_reader_t reader;
int write_fd;
int pid;
int reqh_id;
gboolean closing;
};
struct dispatcher {
int parent_out;
echld_reader_t parent_in;
struct dispatcher_child* children;
int max_children;
int nchildren;
int reqh_id;
int pid;
int ppid;
struct _encs {
child_encoder_t* to_parent;
echld_parent_encoder_t* to_child;
} enc;
struct _decs {
child_decoder_t* from_parent;
parent_decoder_t* from_child;
} dec;
int dumpcap_pid;
gboolean closing;
capture_options capture_opts;
};
struct dispatcher* dispatcher;
#ifdef DEBUG_DISPATCHER
static int debug_lvl = DEBUG_DISPATCHER;
static FILE* debug_fp = NULL;
#define DCOM() /*echld_common_set_dbg(debug_lvl,debug_fp,"Disp")*/
int dispatcher_debug(int level, const char* fmt, ...) {
va_list ap;
char* str;
if (debug_lvl<level) return 1;
va_start(ap, fmt);
str = g_strdup_vprintf(fmt,ap);
va_end(ap);
if (dispatcher) {
fprintf(debug_fp, "dispatcher[%d]: reqh_id=%d dbg_level=%d message='%s'\n", dispatcher->pid, dispatcher->reqh_id, level, str);
} else {
fprintf(debug_fp, "dispatcher: dbg_level=%d message='%s'\n", level, str);
}
fflush(debug_fp);
g_free(str);
return 1;
}
static char* param_get_dbg_level(char** err _U_) {
return g_strdup_printf("%d",debug_lvl);
}
static echld_bool_t param_set_dbg_level(char* val , char** err ) {
char* p;
int lvl = (int)strtol(val, &p, 10);
if (p<=val) {
*err = g_strdup("not an integer");
return FALSE;
} else if (lvl < 0 || lvl > 5) {
*err = g_strdup_printf("invalid level=%d (min=0 max=5)",lvl);
return FALSE;
}
debug_lvl = lvl;
DCOM();
return TRUE;
}
static long dbg_r = 0;
#define DISP_DBG(attrs) ( dispatcher_debug attrs )
#define DISP_DBG_INIT() do { debug_fp = stderr; DCOM(); } while(0)
#define DISP_DBG_START(fname) do { debug_fp = ws_fopen(fname,"a"); DCOM(); DISP_DBG((0,"Log Started")); } while(0)
#define DISP_WRITE(FD,BA,CH,T,RH) ( dbg_r = echld_write_frame(FD,BA,CH,T,RH,NULL), DISP_DBG((1,"SND fd=%d ch=%d ty='%s' rh=%d msg='%s'",FD,CH,TY(T),RH, (dbg_r>0?"ok":g_strerror(errno)))))
#define CHLD_SET_STATE(c,st) do { DISP_DBG((1,"Child[%d] State %s => %s",(c)->chld_id, ST((c)->state), ST((st)) )); (c)->state=(st); } while(0)
#else
#define DISP_DBG(attrs)
#define DISP_DBG_INIT()
#define DISP_DBG_START(fname)
#define DISP_WRITE(FD,BA,CH,T,RH) echld_write_frame(FD,BA,CH,T,RH,NULL)
#define CHLD_SET_STATE(c,st) ((c)->state = (st))
#endif
#define DISP_RESP(B,T) (DISP_WRITE( dispatcher->parent_out, (B), 0, (T), dispatcher->reqh_id))
static echld_epan_stuff_t stuff;
static void init_stuff(void) {
#ifdef HAVE_LIBPCAP
capture_opts_init(&stuff.cap_opts);
capture_session_init(&stuff.cap_sess, &stuff.cfile);
#endif
}
static void children_massacre(void) {
int i;
struct dispatcher_child* cc = dispatcher->children;
int max_children = dispatcher->max_children;
for(i = 0; i < max_children; i++) {
struct dispatcher_child* c = &(cc[i]);
if (c->pid > 0) {
DISP_DBG((0,"killing ch=%d pid=%d",c->chld_id,c->pid));
kill(c->pid,SIGTERM);
}
}
}
static void dispatcher_fatal(int cause, const char* fmt, ...) {
size_t len= 1024;
gchar err_str[len];
va_list ap;
va_start(ap, fmt);
g_vsnprintf(err_str,len,fmt,ap);
va_end(ap);
DISP_DBG((0,"fatal cause=%d msg=\"%s\"",cause ,err_str));
children_massacre();
exit(cause);
}
#define DISP_FATAL(attrs) dispatcher_fatal attrs
static void dispatcher_err(int errnum, const char* fmt, ...) {
size_t len= 1024;
gchar err_str[len];
va_list ap;
static GByteArray* ba;
va_start(ap, fmt);
g_vsnprintf(err_str,len,fmt,ap);
va_end(ap);
DISP_DBG((0,"error=\"%s\"",err_str));
ba = dispatcher->enc.to_parent->error(errnum, err_str);
DISP_RESP(ba,ECHLD_ERROR);
g_byte_array_free(ba,TRUE);
}
/* parameters */
/* interface listing */
static char* intflist2json(GList* if_list, char** if_cap_err) {
#define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
GList *if_entry;
if_info_t *if_info;
GSList *addr;
if_addr_t *if_addr;
if_capabilities_t *caps;
char addr_str[ADDRSTRLEN];
GString *str = g_string_new("{ what='interfaces', interfaces={ \n");
for (if_entry = g_list_first(if_list); if_entry != NULL;
if_entry = g_list_next(if_entry)) {
if_info = (if_info_t *)if_entry->data;
g_string_append_printf(str," %s={ intf='%s',", if_info->name, if_info->name);
/*
* Print the contents of the if_entry struct in a parseable format.
* Each if_entry element is tab-separated. Addresses are comma-
* separated.
*/
/* XXX - Make sure our description doesn't contain a tab */
if (if_info->vendor_description != NULL)
g_string_append_printf(str," vnd_desc='%s',", if_info->vendor_description);
/* XXX - Make sure our friendly name doesn't contain a tab */
if (if_info->friendly_name != NULL)
g_string_append_printf(str," name='%s', addrs=[ ", if_info->friendly_name);
for (addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
addr = g_slist_next(addr)) {
if_addr = (if_addr_t *)addr->data;
switch(if_addr->ifat_type) {
case IF_AT_IPv4:
if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
ADDRSTRLEN)) {
g_string_append_printf(str,"'%s',", addr_str);
} else {
g_string_append(str,"'<unknown IPv4>',");
}
break;
case IF_AT_IPv6:
if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
addr_str, ADDRSTRLEN)) {
g_string_append_printf(str,"'%s',", addr_str);
} else {
g_string_append(str,"'<unknown IPv6>',");
}
break;
default:
g_string_append_printf(str,"'<type unknown %u>',", if_addr->ifat_type);
}
}
g_string_truncate(str,str->len - 1); /* the last comma or space (on empty list) */
g_string_append(str," ]"); /* addrs */
if (if_info->loopback)
g_string_append(str,", loopback=1");
else
g_string_append(str,", loopback=0");
caps = capture_get_if_capabilities(if_info->name, 0, NULL, if_cap_err, NULL);
if (caps != NULL) {
if (caps->data_link_types != NULL) {
GList* lt_entry = caps->data_link_types;
data_link_info_t *data_link_info;
g_string_append(str,", data_link_types=[");
for (; lt_entry != NULL; lt_entry = g_list_next(lt_entry) ) {
data_link_info = (data_link_info_t *)lt_entry->data;
g_string_append_printf(str,"{ name='%s', desc='%s' }, ", data_link_info->name, (data_link_info->description) ? data_link_info->description : "" );
}
g_string_truncate(str,str->len - 2); /* the comma and space */
g_string_append(str,"]");
}
g_string_append_printf(str,", can_set_rfmon=%s", caps->can_set_rfmon ? "1" : "0");
if (caps->can_set_rfmon) {
free_if_capabilities(caps);
caps = capture_get_if_capabilities(if_info->name, 1, NULL, if_cap_err, NULL);
if (caps->data_link_types != NULL) {
GList* lt_entry = caps->data_link_types;
data_link_info_t *data_link_info;
g_string_append(str,", data_link_types_rfmon=[");
for (; lt_entry != NULL; lt_entry = g_list_next(lt_entry)) {
data_link_info = (data_link_info_t *)lt_entry->data;
g_string_append_printf(str,"{ name='%s', desc='%s' }, ", data_link_info->name, (data_link_info->description) ? data_link_info->description : "" );
}
g_string_truncate(str,str->len - 2); /* the comma and space */
g_string_append(str,"]");
}
}
free_if_capabilities(caps);
}
g_string_append(str,"},\n");
}
g_string_truncate(str,str->len - 2); /* the comma and return */
g_string_append(str,"}");
return g_string_free(str,FALSE);
}
static char* intf_list = NULL;
static void get_interfaces(char** err) {
int err_no = 0;
GList* if_list;
err = NULL;
if_list = capture_interface_list(&err_no, err, NULL);
if (err) {
DISP_DBG((1,"Could not get capture interface list: %s",err));
} else {
intf_list = intflist2json(if_list,err);
if (err) {
DISP_DBG((1,"get capabilities error: %s",err));
}
}
free_interface_list(if_list);
}
static char* param_get_interfaces(char** err _U_) {
return g_strdup(intf_list ? intf_list : "");
}
static long disp_loop_timeout_usec = DISPATCHER_WAIT_INITIAL;
static char* param_get_loop_timeout(char** err _U_) {
return g_strdup_printf("%fs", (((float)disp_loop_timeout_usec)/1000000.0) );
}
static echld_bool_t param_set_loop_timeout(char* val , char** err ) {
char* p;
int usec = (int)strtol(val, &p, 10); /* now usecs 2DO: "10ms" or "500us" or "1s" */
if (p<=val) {
*err = g_strdup("not an integer");
return FALSE;
}
disp_loop_timeout_usec = usec;
return TRUE;
}
static GString *comp_info_str;
static GString *runtime_info_str;
static const char* version_str = "Echld " VERSION;
static char* version_long_str = NULL;
static char* param_get_long_version(char** err _U_) {
return g_strdup(version_long_str);
}
static char* param_get_version(char** err _U_) {
return g_strdup(version_str);
}
static char* param_get_capture_types(char** err _U_) {
GString* str = g_string_new("");
int i;
for (i = 0; i < WTAP_NUM_FILE_TYPES_SUBTYPES; i++) {
if (wtap_dump_can_open(i)) {
g_string_append_printf(str,"%s: %s\n",
wtap_file_type_subtype_short_string(i), wtap_file_type_subtype_string(i));
}
}
return g_string_free(str,FALSE);
}
static echld_bool_t param_set_add_hosts_file(char* val, char** err) {
if (add_hosts_file(val)) {
return TRUE;
} else {
*err = g_strdup_printf("Can't read host entries from \"%s\"",val);
return FALSE;
}
}
static echld_bool_t param_set_x_opt(char* val, char** err) {
if (ex_opt_add(val)) {
return TRUE;
} else {
*err = g_strdup_printf("Cannot set X opt '%s'",val);
return FALSE;
}
}
static char* param_get_params(char** err _U_);
static param_t disp_params[] = {
#ifdef DEBUG_DISPATCHER
PARAM(dbg_level,"0>int>5"),
# endif
RO_PARAM(long_version,"long version string"),
RO_PARAM(version,"version string"),
PARAM(loop_timeout,"main loop step timeout"),
RO_PARAM(interfaces,"interface information"),
RO_PARAM(capture_types,"the available capture types"),
WO_PARAM(add_hosts_file,"Add a hosts file"),
WO_PARAM(x_opt,"Set a -X option"),
RO_PARAM(params,"This List"),
{NULL,NULL,NULL,NULL}
};
static char* param_get_params(char** err _U_) {
return paramset_get_params_list(disp_params,PARAM_LIST_FMT);
}
static struct dispatcher_child* dispatcher_get_child(struct dispatcher* d, int chld_id) {
int i;
struct dispatcher_child* cc = d->children;
int max_children = d->max_children;
for(i = 0; i < max_children; i++) {
struct dispatcher_child* c = &(cc[i]);
if (c->chld_id == chld_id) return c;
}
return NULL;
}
static void dispatcher_clear_child(struct dispatcher_child* c) {
echld_reset_reader(&(c->reader), -1, 4096);
c->chld_id = -1;
c->state = FREE;
c->reader.fd = -1;
c->write_fd = -1;
c->pid = -1;
c->reqh_id = -1;
c->closing = FALSE;
}
static void set_dumpcap_pid(int pid) {
dispatcher->dumpcap_pid = pid;
}
static void preinit_epan(char* argv0, int (*main)(int, char **)) {
char *gdp_path, *dp_path;
#if 0
char *gpf_path, *pf_path;
int gpf_open_errno, gpf_read_errno;
int pf_open_errno, pf_read_errno;
#endif
int gdp_open_errno, gdp_read_errno;
int dp_open_errno, dp_read_errno;
char* error;
error = init_progfile_dir(argv0, main);
comp_info_str = get_compiled_version_info(NULL, epan_get_compiled_version_info);
runtime_info_str = get_runtime_version_info(NULL);
version_long_str = g_strdup_printf("Echld %s\n%s\n%s\n%s",
get_ws_vcs_version_info(), get_copyright_info(),
comp_info_str->str, runtime_info_str->str);
if (error) {
DISP_FATAL((CANNOT_PREINIT_EPAN,"Failed epan_preinit: msg='%s'",error));
}
/* Add it to the information to be reported on a crash. */
ws_add_crash_info("Echld %s\n%s\n%s",
get_ws_vcs_version_info(), comp_info_str->str, runtime_info_str->str);
init_stuff();
capture_sync_set_fetch_dumpcap_pid_cb(set_dumpcap_pid);
init_process_policies();
get_interfaces(&error);
if (error) {
DISP_FATAL((CANNOT_PREINIT_EPAN,"Error getting interfaces: %s", error));
}
prefs_apply_all();
/* disabled protocols as per configuration file */
set_disabled_protos_list();
set_disabled_heur_dissector_list();
setlocale(LC_ALL, "");
DISP_DBG((1,"---5"));
read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno, &dp_path, &dp_open_errno, &dp_read_errno);
read_disabled_heur_dissector_list(&gdp_path, &gdp_open_errno, &gdp_read_errno, &dp_path, &dp_open_errno, &dp_read_errno);
DISP_DBG((1,"---6"));
cap_file_init(&stuff.cfile);
DISP_DBG((1,"---7"));
DISP_DBG((1,"---8"));
timestamp_set_precision(TS_PREC_AUTO);
#if 0
sleep(10);
initialize_funnel_ops();
stuff.prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path, &pf_open_errno, &pf_read_errno, &pf_path);
check 4 errors
#endif
DISP_DBG((2,"epan preinit done"));
}
static void dispatcher_clear(void) {
DISP_DBG((2,"dispatcher_clear"));
/* remove unnecessary stuff for the working child */
/* remove signal handlers */
}
void dispatcher_sig(int sig) {
DISP_FATAL((TERMINATED,"SIG sig=%d",sig));
exit(1);
}
void dispatcher_reaper(int sig) {
int status;
int i;
struct dispatcher_child* cc = dispatcher->children;
int max_children = dispatcher->max_children;
int pid = waitpid(-1, &status, WNOHANG);
int reqh_id_save = dispatcher->reqh_id;
dispatcher->reqh_id = 0;
if (sig != SIGCHLD) {
DISP_DBG((1,"Reaper got wrong signal=%d",sig));
dispatcher->reqh_id = reqh_id_save;
return;
}
DISP_DBG((2,"Child dead pid=%d",pid));
for(i = 0; i < max_children; i++) {
struct dispatcher_child* c = &(cc[i]);
if ( c->pid == pid ) {
if (c->closing || dispatcher->closing) {
DISP_WRITE(dispatcher->parent_out, NULL, c->chld_id, ECHLD_CLOSING, c->reqh_id);
} else {
char* s = NULL;
GByteArray* em;
if (WIFEXITED(status)) {
s = g_strdup_printf(
"Unexpected dead: reason='exited' pid=%d status=%d",
pid, WEXITSTATUS(status));
} else if ( WIFSIGNALED(status) ) {
s = g_strdup_printf(
"Unexpected dead: reason='signaled' pid=%d termsig=%d coredump=%s",
pid, WTERMSIG(status), WCOREDUMP(status) ? "yes":"no");
/*if (WCOREDUMP(status)) { system("analyze_coredump.sh pid=%d") } */
} else if (WIFSTOPPED(status)) {
s = g_strdup_printf(
"Unexpected dead: reason='stopped' pid=%d stopsig=%d",
pid, WSTOPSIG(status));
}
em = dispatcher->enc.to_parent->child_dead(s);
dispatcher_err(ECHLD_ERR_CRASHED_CHILD, s);
if (s) g_free(s);
DISP_WRITE(dispatcher->parent_out, em, c->chld_id, ECHLD_CHILD_DEAD, 0);
if (em) g_byte_array_free(em,TRUE);
}
CHLD_SET_STATE(c,CLOSED);
dispatcher_clear_child(c);
dispatcher->reqh_id = reqh_id_save;
return;
}
}
if (pid == dispatcher->dumpcap_pid) {
dispatcher->dumpcap_pid = 0;
dispatcher->reqh_id = reqh_id_save;
DISP_DBG((2,"dumpcap dead pid=%d",pid));
return;
}
dispatcher_err(ECHLD_ERR_UNKNOWN_PID, "Unknown child pid: %d", pid);
dispatcher->reqh_id = reqh_id_save;
}
static void dispatcher_destroy(void) {
/* destroy the dispatcher stuff at closing */
dispatcher->closing = TRUE;
children_massacre();
exit(0);
}
/* stuff coming from child going to parent */
static long dispatch_to_parent(guint8* b, size_t len, echld_chld_id_t chld_id, echld_msg_type_t type, echld_reqh_id_t reqh_id, void* data) {
/* TODO: timeouts, clear them */
/* TODO: keep stats */
GByteArray in_ba;
struct dispatcher_child* c = (struct dispatcher_child*)data;
dispatcher->reqh_id = c->reqh_id = reqh_id;
in_ba.data = b;
in_ba.len = (guint)len;
if (chld_id != c->chld_id) {
goto misbehabing;
}
switch(type) {
case ECHLD_ERROR: break;
case ECHLD_TIMED_OUT: break;
case ECHLD_HELLO: CHLD_SET_STATE(c,IDLE); break;
case ECHLD_CLOSING:
c->closing = TRUE;
CHLD_SET_STATE(c,CLOSING);
break;
case ECHLD_PARAM: break;
case ECHLD_PONG: break;
case ECHLD_FILE_OPENED: CHLD_SET_STATE(c,READING); break;
case ECHLD_INTERFACE_OPENED: CHLD_SET_STATE(c,READY); break;
case ECHLD_CAPTURE_STARTED: CHLD_SET_STATE(c,CAPTURING); break;
case ECHLD_NOTIFY: break;
case ECHLD_PACKET_SUM: break;
case ECHLD_TREE: break;
case ECHLD_BUFFER: break;
case ECHLD_EOF:
case ECHLD_CAPTURE_STOPPED: CHLD_SET_STATE(c,DONE); break;
case ECHLD_NOTE_ADDED: break;
case ECHLD_PACKET_LIST: break;
case ECHLD_FILE_SAVED: break;
default:
goto misbehabing;
}
DISP_DBG((4,"Dispatching to parent reqh_id=%d chld_id=%d type='%c'",reqh_id,c->chld_id,type));
return DISP_WRITE(dispatcher->parent_out, &in_ba, chld_id, type, reqh_id);
misbehabing:
CHLD_SET_STATE(c,ERRORED);
c->closing = TRUE;
kill(c->pid,SIGTERM);
dispatcher_err(ECHLD_ERR_CRASHED_CHILD,"chld_id=%d",chld_id);
return 0;
}
static struct timeval start_wait_time;
static long start_wait_time_us = CHILD_START_WAIT_TIME;
static void detach_new_child(enc_msg_t* em, echld_chld_id_t chld_id) {
struct dispatcher_child* c;
int reqh_id = dispatcher->reqh_id;
int pid;
if (( c = dispatcher_get_child(dispatcher, chld_id) )) {
dispatcher_err(ECHLD_ERR_CHILD_EXISTS,"chld_id=%d exists already while creating new child",chld_id);
return;
} else if (( c = dispatcher_get_child(dispatcher, -1) )) {
int disp_pipe_fds[2];
int child_pipe_fds[2];
int pipe_to_disp;
int pipe_from_disp;
int pipe_to_child;
int pipe_from_child;
DISP_DBG((5,"new_child pipe(dispatcher)"));
if( pipe(disp_pipe_fds) < 0) {
dispatcher_err(ECHLD_ERR_CANNOT_FORK,"CANNOT OPEN PARENT PIPE: %s",g_strerror(errno));
return;
}
pipe_from_disp = disp_pipe_fds[0];
pipe_to_child = disp_pipe_fds[1];
DISP_DBG((5,"new_child pipe(child)"));
if( pipe(child_pipe_fds) < 0) {
close(pipe_from_disp);
close(pipe_to_child);
dispatcher_err(ECHLD_ERR_CANNOT_FORK,"CANNOT OPEN CHILD PIPE: %s",g_strerror(errno));
return;
}
pipe_from_child = child_pipe_fds[0];
pipe_to_disp = child_pipe_fds[1];
DISP_DBG((4,"New Child Forking()"));
switch (( pid = fork() )) {
case -1: {
close(pipe_to_child);
close(pipe_to_disp);
close(pipe_from_child);
close(pipe_from_disp);
dispatcher_err(ECHLD_ERR_CANNOT_FORK,"CANNOT FORK: %s",g_strerror(errno));
return;
}
case 0: {
/* I'm the child */
dispatcher_clear();
close(pipe_to_child);
close(pipe_from_child);
echld_child_initialize(chld_id, pipe_from_disp,pipe_to_disp,reqh_id,&stuff);
exit( echld_child_loop() );
/* it won't */
return;
}
default: {
/* I'm the parent */
close(pipe_to_disp);
close(pipe_from_disp);
echld_reset_reader(&(c->reader), pipe_from_child,4096);
c->write_fd = pipe_to_child;
c->pid = pid;
c->chld_id = chld_id;
c->closing = FALSE;
CHLD_SET_STATE(c,CREATING);
DISP_DBG((4,"Child Forked pid=%d chld_id=%d from_fd=%d to_fd=%d",
pid, c->chld_id, pipe_from_child, pipe_to_child));
start_wait_time.tv_sec = (int)(start_wait_time_us / 1000000);
start_wait_time.tv_usec = (int)(start_wait_time_us % 1000000);
select(0,NULL,NULL,NULL,&start_wait_time);
/* configure child */
DISP_WRITE(pipe_to_child, em, c->chld_id, ECHLD_NEW_CHILD, dispatcher->reqh_id);
return;
}
}
} else {
dispatcher_err(ECHLD_ERR_CANNOT_FORK, "MAX CHILDREN REACHED: max_children=%d",dispatcher->max_children);
return;
}
}
/* process signals sent from parent */
static long dispatch_to_child(guint8* b, size_t len, echld_chld_id_t chld_id, echld_msg_type_t type, echld_reqh_id_t reqh_id, void* data _U_) {
GByteArray in_ba;
in_ba.data = b;
in_ba.len = (guint)len;
dispatcher->reqh_id = reqh_id;
DISP_DBG((1,"RCV<- type='%s' chld_id=%d reqh_id=%d",TY(type),chld_id,reqh_id));
if (chld_id == 0) { /* these are messages sent to the dispatcher itself */
DISP_DBG((2,"Message to Dispatcher"));
switch(type) {
case ECHLD_CLOSE_CHILD:
dispatcher_destroy();
return 0;
case ECHLD_PING:
DISP_DBG((2,"PONG reqh_id=%d",reqh_id));
DISP_WRITE(dispatcher->parent_out, NULL, chld_id, ECHLD_PONG, reqh_id);
return 0;
case ECHLD_SET_PARAM:{
char* param;
char* value;
if ( dispatcher->dec.from_parent->set_param(b,len,&param,&value) ) {
GByteArray* ba;
char* err;
if (! paramset_apply_set (disp_params, param, value, &err) ) {
dispatcher_err(ECHLD_CANNOT_SET_PARAM,"%s",err);
g_free(err);
return 0;
}
ba = dispatcher->enc.to_parent->param(param,value);
DISP_RESP(ba,ECHLD_PARAM);
g_byte_array_free(ba,TRUE);
DISP_DBG((1,"Set Param: param='%s' value='%s'",param,value));
return 0;
} else {
dispatcher_err(ECHLD_CANNOT_SET_PARAM,"reason='decoder error'");
return 0;
}
}
case ECHLD_GET_PARAM: {
GByteArray* ba;
char* param;
if ( dispatcher->dec.from_parent->get_param(b,len,&param) ) {
char* err;
char* val;
if (! (val = paramset_apply_get (disp_params, param, &err)) ) {
dispatcher_err(ECHLD_CANNOT_GET_PARAM,"%s",err);
g_free(err);
return 0;
}
ba = dispatcher->enc.to_parent->param(param,val);
DISP_RESP(ba,ECHLD_PARAM);
g_byte_array_free(ba,TRUE);
DISP_DBG((1,"Get Param: param='%s' value='%s'",param,val));
return 0;
} else {
dispatcher_err(ECHLD_CANNOT_GET_PARAM,"reason='decoder error'");
return 0;
}
}
default:
dispatcher_err(ECHLD_ERR_WRONG_MSG, "wrong message to dispatcher type='%c'", type);
return 0;
}
} else {
struct dispatcher_child* c;
DISP_DBG((2,"Parent => Child"));
if (! (c = dispatcher_get_child(dispatcher, chld_id)) ) {
if (type == ECHLD_NEW_CHILD) {
detach_new_child(&in_ba,chld_id);
return 0;
} else {
dispatcher_err(ECHLD_ERR_NO_SUCH_CHILD, "wrong chld_id %d", chld_id);
return 0;
}
} else {
switch(type) {
case ECHLD_CLOSE_CHILD:
CHLD_SET_STATE(c,CLOSED);
goto relay_frame;
case ECHLD_OPEN_FILE:
CHLD_SET_STATE(c,READING);
goto relay_frame;
case ECHLD_OPEN_INTERFACE:
CHLD_SET_STATE(c,READY);
goto relay_frame;
case ECHLD_START_CAPTURE:
CHLD_SET_STATE(c,CAPTURING);
goto relay_frame;
case ECHLD_STOP_CAPTURE:
CHLD_SET_STATE(c,DONE);
goto relay_frame;
case ECHLD_SAVE_FILE:
case ECHLD_APPLY_FILTER:
case ECHLD_SET_PARAM:
case ECHLD_GET_PARAM:
case ECHLD_PING:
case ECHLD_GET_SUM:
case ECHLD_GET_TREE:
case ECHLD_GET_BUFFER:
case ECHLD_ADD_NOTE:
relay_frame: {
DISP_DBG((3,"Relay to Child chld_id=%d type='%c' req_id=%d",chld_id, type, reqh_id));
return DISP_WRITE(c->write_fd, &in_ba, chld_id, type, reqh_id);
}
default:
dispatcher_err(ECHLD_ERR_WRONG_MSG, "wrong message %d %c", reqh_id, type);
return 0;
}
}
}
}
int dispatcher_loop(void) {
int parent_out = dispatcher->parent_out;
int parent_in = dispatcher->parent_in.fd;
struct dispatcher_child* children = dispatcher->children;
DISP_DBG((5,"LOOP in_fd=%d out_fd=%d",parent_in, parent_out));
do {
fd_set rfds;
fd_set efds;
struct dispatcher_child* c;
int nfds;
int nchld = 0;
struct timeval disp_loop_timeout;
FD_ZERO(&rfds);
FD_ZERO(&efds);
FD_SET(parent_in,&rfds);
FD_SET(parent_in,&efds);
FD_SET(parent_out,&efds);
for (c = children; c->pid; c++) {
if (c->chld_id > 0) {
nchld++;
FD_SET(c->reader.fd, &rfds);
FD_SET(c->reader.fd, &efds);
}
}
DISP_DBG((4,"Select()ing nchld=%d",nchld,disp_loop_timeout.tv_usec));
disp_loop_timeout.tv_sec = (int)(disp_loop_timeout_usec / 1000000);
disp_loop_timeout.tv_usec = (int)(disp_loop_timeout_usec % 1000000);
nfds = select(FD_SETSIZE, &rfds, NULL, &efds, &disp_loop_timeout);
DISP_DBG((5,"Select()ed nfds=%d",nchld,nfds));
if (nfds < 0) {
DISP_DBG((1,"select error='%s'",g_strerror(errno) ));
continue;
}
if ( FD_ISSET(parent_in, &rfds)) {
long st = echld_read_frame(&(dispatcher->parent_in), dispatch_to_child, dispatcher);
if (st < 0) {
DISP_DBG((1,"read frame returning < 0 for parent"));
/* XXX: ??? */
continue;
}
}
if ( FD_ISSET(parent_in, &efds) ) {
DISP_DBG((1,"Parent In Pipe Errored!"));
continue;
}
if ( FD_ISSET(parent_out, &efds) ) {
DISP_DBG((1,"Parent Out Pipe Errored!"));
continue;
}
for (c=children; c->pid; c++) {
if (c->reader.fd > 0) {
if ( FD_ISSET(c->reader.fd,&efds) ) {
struct timeval wait_time;
wait_time.tv_sec = 0;
wait_time.tv_usec = DISP_KILLED_CHILD_WAIT;
DISP_DBG((1,"errored child pipe chld_id=%d",c->chld_id));
kill(c->pid,SIGTERM);
select(0,NULL,NULL,NULL,&wait_time);
dispatcher_clear_child(c);
continue;
}
if (FD_ISSET(c->reader.fd,&rfds)) {
long st = echld_read_frame(&(c->reader), dispatch_to_parent, c);
if (st < 0) {
DISP_DBG((1,"read_frame returned < 0 for chld_id=%d",c->chld_id));
/* XXX */
continue;
}
continue;
}
}
}
} while(1);
/* won't */
return 1;
}
void dispatcher_alrm(int sig _U_) {
DISP_DBG((1,"ALRM received"));
}
void echld_dispatcher_start(int* in_pipe_fds, int* out_pipe_fds, char* argv0, int (*main)(int, char **)) {
static struct dispatcher d;
int i;
DISP_DBG_INIT();
DISP_DBG((2,"Dispatcher Starting"));
signal(SIGCHLD,dispatcher_reaper);
signal(SIGTERM,dispatcher_sig);
signal(SIGPIPE,dispatcher_sig);
signal(SIGINT,SIG_IGN);
signal(SIGCONT,SIG_IGN);
signal(SIGABRT,dispatcher_sig);
signal(SIGHUP,dispatcher_sig);
signal(SIGALRM,dispatcher_alrm);
dispatcher = &d;
echld_init_reader(&(d.parent_in),in_pipe_fds[0],4096);
d.parent_out = out_pipe_fds[1];
d.children = g_new0(struct dispatcher_child,ECHLD_MAX_CHILDREN);
d.max_children = ECHLD_MAX_CHILDREN;
d.nchildren = 0;
d.reqh_id = -1;
d.pid = getpid();
d.dumpcap_pid = 0;
for (i=0;i<ECHLD_MAX_CHILDREN;i++) dispatcher_clear_child(&(d.children[i]));
close(out_pipe_fds[0]);
close(in_pipe_fds[1]);
echld_get_all_codecs(&(d.enc.to_parent), &(d.dec.from_parent), &(d.enc.to_child), &(d.dec.from_child));
DISP_DBG((2,"Dispatcher Configured pid=%d parent_in=%d parent_out=%d",d.pid,in_pipe_fds[0],d.parent_out));
preinit_epan(argv0,main);
DISP_WRITE(dispatcher->parent_out, NULL, 0, ECHLD_HELLO, 0);
exit(dispatcher_loop());
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=4 tabstop=8 noexpandtab:
* :indentSize=4:tabSize=8:noTabs=false:
*/
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