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wireshark/echld_child.c

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/* echld_child.c
* epan working child internals
* Child process routines and definitions
*
* $Id$
*
* 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"
// echld_
typedef struct _child {
child_state_t state;
int pid;
int ppid;
int chld_id;
int reqh_id;
echld_reader_t parent;
struct _fds {
int pipe_to_parent;
int pipe_from_dumpcap;
int pipe_to_dumpcap;
int file_being_read;
} fds;
struct timeval started;
struct timeval now;
child_encoder_t* enc;
child_decoder_t* dec;
// epan stuff
} echld_child_t;
static echld_child_t child;
#define CHILD_RESP(BYTEARR,TYPE) echld_write_frame(child.fds.pipe_to_parent, BYTEARR, child.chld_id, TYPE, child.reqh_id, NULL)
#ifdef DEBUG_CHILD
static int dbg_level = 0;
void child_debug(int level, char* fmt, ...) {
va_list ap;
char* str;
if (dbg_level<level) return;
va_start(ap, fmt);
str = g_strdup_vprintf(fmt,ap);
va_end(ap);
fprintf(stderr, "child[%d]: reqh_id=%d dbg_level=%d message='%s'", child.pid, child.reqh_id, level, str);
g_free(str);
}
#define CHILD_DBG(attrs) ( child_debug attrs )
#else
#define CHILD_DBG(attrs)
#endif
void echld_child_initialize(int pipe_from_parent, int pipe_to_parent, int reqh_id) {
child.state = IDLE;
child.pid = getpid();
child.ppid = getppid();
child.chld_id = 0;
child.reqh_id = reqh_id;
echld_init_reader( &(child.parent), pipe_from_parent,4096);
child.fds.pipe_to_parent = pipe_to_parent;
child.fds.pipe_from_dumpcap = -1;
child.fds.pipe_to_dumpcap = -1;
child.fds.file_being_read = -1;
gettimeofday(&child.started,NULL);
gettimeofday(&child.now,NULL);
echld_get_all_codecs(&(child.enc), &(child.dec), NULL, NULL);
/* epan stuff */
CHILD_DBG((5,"Child Initialized"));
}
void child_err(int e, unsigned reqh_id, const char* fmt, ...) {
size_t len= 1024;
guint8* b[len];
gchar err_str[len];
va_list ap;
static GByteArray* ba;
va_start(ap, fmt);
g_vsnprintf(err_str,len,fmt,ap);
va_end(ap);
CHILD_DBG((0,"error='%s'",err_str));
ba = (void*)child.enc->error(e, err_str);
echld_write_frame(child.fds.pipe_to_parent, ba, child.chld_id, ECHLD_ERROR, reqh_id, NULL);
g_byte_array_free(ba,TRUE);
}
static char* intflist2json(GList* if_list) {
/* blatantly stolen from print_machine_readable_interfaces in dumpcap.c */
#define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
int i;
GList *if_entry;
if_info_t *if_info;
GSList *addr;
if_addr_t *if_addr;
char addr_str[ADDRSTRLEN];
GString *str = g_string_new("={ ");
char* s;
i = 1; /* Interface id number */
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,"%d={ intf='%s',", i++, 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_append(str," ]"); /* addrs */
if (if_info->loopback)
g_string_append(str,", loopback=1");
else
g_string_append(str,", loopback=0");
g_string_append(str,"}, ");
}
g_string_truncate(str,str->len - 2); /* the comma and space */
g_string_append(str,"}");
s=str->str;
g_string_free(str,FALSE);
return s;
}
static void child_start_interface_listing() {}
static gboolean child_open_file(int chld_id, int reqh_id, char* filename, guint8* buff, int buff_len) {
char* reason = "Unimplemented"; // this ain't a good reason to fail!
g_snprintf(buff,buff_len,"Cannot open file=%s reason=%s",filename,reason);
return FALSE;
}
static gboolean child_open_interface(int chld_id, int reqh_id, const char* intf_name, const char* params, guint8* err_buf, int errbuff_len) {
char* reason = "Unimplemented"; // this ain't a good reason to fail!
g_snprintf(err_buf,errbuff_len,"Cannot open interface=%s reason=%s",intf_name,reason);
return FALSE;
}
static void child_list_files() {
char* file_info = "{glob='*.cap', file_list={'dummy.cap'={type='pcap-ng', size=20300, npackets=502}}}";
// ls
// foreach file in cur dir
GByteArray* ba = (void*)child.enc->file_info(file_info);
CHILD_RESP(ba,ECHLD_FILE_INFO);
g_byte_array_free(ba,TRUE);
}
static char* param_get_cwd(char** err ) {
char* pwd = getcwd(NULL, 128);
if (!pwd) {
*err = g_strdup(strerror(errno));
}
return pwd;
}
static echld_bool_t param_set_cwd(char* val , char** err ) {
/* XXX SANITIZE */
if (chdir(val) != 0) {
*err = g_strdup_printf("(%d)'%s'",errno,strerror(errno));
return FALSE;
}
return TRUE;
}
#define COOKIE_SIZE 1024
static char* cookie = NULL;
static char* param_get_cookie(char** err ) {
if (cookie)
return g_strdup(cookie);
*err = g_strdup("cookie not set");
}
static echld_bool_t param_set_cookie(char* val , char** err ) {
if (cookie) g_free(cookie);
cookie = g_strdup(val);
return TRUE;
}
#ifdef DEBUG_CHILD
static char* param_get_dbg_level(char** err ) {
return g_strdup_printf("%d",dbg_level);
}
static echld_bool_t param_set_dbg_level(char* val , char** err ) {
char* p;
int lvl = 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;
}
dbg_level = lvl;
return TRUE;
}
#endif
static param_t params[] = {
#ifdef DEBUG_CHILD
{"dbg_level", param_get_dbg_level, param_set_dbg_level},
# endif
{"cookie",param_get_cookie,param_set_cookie},
{"cwd",param_get_cwd,param_set_cwd},
{NULL,NULL,NULL}
};
static param_t* get_paramset(char* name) {
int i;
for (i = 0; params[i].name != NULL;i++) {
if (strcmp(name,params[i].name) == 0 ) return &(params[i]);
}
return NULL;
}
static gboolean child_set_filter(char* dflt, GString* err) { return FALSE; }
static gboolean child_start_capture(GString* msg, GString* err) { return FALSE; }
static gboolean child_stop_capture(GString* msg, GString* err) { return FALSE; }
static gboolean child_get_packets(GString* msg, GString* err) { return FALSE; }
static gboolean child_apply_filter(char* dflt, GString* err) { return FALSE; }
static gboolean child_add_note(int packet_num, char* note, GString* err) { return FALSE; }
static int child_receive(guint8* b, size_t len, echld_chld_id_t chld_id, echld_msg_type_t type, echld_reqh_id_t reqh_id, void* data) {
GByteArray* ba = NULL;
child.chld_id = chld_id;
child.reqh_id = reqh_id;
CHILD_DBG((2,"Message Received type='%c' len='%d'",type,len));
// gettimeofday(&(child.now), NULL);
if (child.chld_id != chld_id) {
if (child.chld_id == 0) {
if ( type == ECHLD_NEW_CHILD) {
child.chld_id = chld_id;
// more init needed for sure
CHILD_DBG((1,"chld_id set, sending HELLO"));
CHILD_RESP(ba,ECHLD_HELLO);
return 0;
} else {
child_err(ECHLD_ERR_WRONG_MSG,reqh_id,
"not yet initialized: chld_id:%d msg_type='%c'",chld_id,type);
return 0;
}
}
child_err(ECHLD_ERR_WRONG_MSG,reqh_id,
"chld_id: own:%d given:%d msg_type='%c'",child.chld_id,chld_id,type);
return 0;
}
switch(type) {
case ECHLD_PING:
CHILD_DBG((1,"PONG"));
CHILD_RESP(ba,ECHLD_PONG);
break;
case ECHLD_SET_PARAM:{
char* param;
char* value;
if ( child.dec->set_param && child.dec->set_param(b,len,&param,&value) ) {
param_t* p = get_paramset(param);
char* err;
if (!p) {
child_err(ECHLD_CANNOT_SET_PARAM,reqh_id,"no such param='%s'",param);
break;
}
if (!p->set) {
child_err(ECHLD_CANNOT_GET_PARAM,reqh_id,"reason='read only'");
break;
}
if (! p->set(value,&err) ) {
child_err(ECHLD_CANNOT_SET_PARAM,reqh_id,"reason='%s'",err);
g_free(err);
break;
}
ba = (void*)child.enc->param(param,value);
CHILD_RESP(ba,ECHLD_PARAM);
g_byte_array_free(ba,TRUE);
CHILD_DBG((1,"Set Param: param='%s' value='%s'",param,value));
break;
} else {
child_err(ECHLD_CANNOT_SET_PARAM,reqh_id,"reason='decoder error'");
break;
}
}
case ECHLD_GET_PARAM: {
char* param;
if ( child.dec->get_param && child.dec->get_param(b,len,&param) ) {
char* err;
char* val;
param_t* p = get_paramset(param);
if (!p) {
child_err(ECHLD_CANNOT_GET_PARAM,reqh_id,"no such param='%s'",param);
break;
}
if (!p->get) {
child_err(ECHLD_CANNOT_GET_PARAM,reqh_id,"reason='write only'");
break;
}
if (!(val = p->get(&err))) {
child_err(ECHLD_CANNOT_GET_PARAM,reqh_id,"reason='%s'",err);
g_free(err);
break;
}
ba = (void*)child.enc->param(param,val);
CHILD_RESP(ba,ECHLD_PARAM);
g_byte_array_free(ba,TRUE);
CHILD_DBG((2,"Get Param: param='%s' value='%s'",param,val));
break;
} else {
child_err(ECHLD_CANNOT_GET_PARAM,reqh_id,"reason='decoder error'");
break;
}
}
case ECHLD_CLOSE_CHILD:
CHILD_RESP(ba,ECHLD_CLOSING);
CHILD_DBG((3,"Closing"));
// select(0,NULL,NULL,NULL,sleep_time);
CHILD_DBG((1,"Bye"));
exit(0);
break;
case ECHLD_LIST_FILES:
if (child.state != IDLE) goto wrong_state;
CHILD_DBG((3,"Listing Files"));
child_list_files();
break;
case ECHLD_LIST_INTERFACES:
{
char* err_str;
int err = 0;
GList* if_list;
if (child.state != IDLE) goto wrong_state;
CHILD_DBG((1,"List Interfaces"));
if(( if_list = capture_interface_list(&err, &err_str) )) {
char* json_list = intflist2json(if_list);
ba = (void*)child.enc->intf_info(json_list);
CHILD_RESP(ba,ECHLD_INTERFACE_INFO);
g_byte_array_free(ba,TRUE);
CHILD_DBG((1,"List interfaces=%s",json_list));
g_free(json_list);
/* XXX FREE if_list */
break;
} else {
child_err(ECHLD_ERR_CANNOT_LIST_INTERFACES, reqh_id,
"reason='%s'", err_str);
}
break;
}
case ECHLD_CHK_FILTER: // first candidate
case ECHLD_OPEN_INTERFACE:
case ECHLD_OPEN_FILE:
case ECHLD_START_CAPTURE:
case ECHLD_STOP_CAPTURE:
case ECHLD_GET_SUM:
case ECHLD_GET_TREE:
case ECHLD_GET_BUFFER:
case ECHLD_ADD_NOTE:
case ECHLD_APPLY_FILTER:
case ECHLD_SAVE_FILE:
goto not_implemented;
default:
child_err(ECHLD_ERR_WRONG_MSG,reqh_id,"chld_id=%d msg_type='%c'",chld_id,type);
break;
}
return 0;
misencoded:
// dump the misencoded message (b,blen)
child_err(ECHLD_ERR_WRONG_MSG,reqh_id,"misencoded msg msg_type='%c'",type);
return 0;
wrong_state:
child_err(ECHLD_ERR_WRONG_MSG,reqh_id,"unexpected message: received in wrong state='%c', msg_type='%c'",child.state,type);
return 0;
not_implemented:
child_err(ECHLD_ERR_UNIMPLEMENTED,reqh_id,"unimplemented message: received in wrong state='%c', msg_type='%c'",child.state,type);
return 0;
}
static void child_dumpcap_read() {
// this folk manages the reading of dumpcap's pipe
// it has to read interface descriptions when doing so
// and managing capture during capture
CHILD_DBG((2,"child_dumpcap_read"));
}
static void child_read_file() {
// this folk manages the reading of the file after open file has opened it
CHILD_DBG((2,"child_read_file"));
}
int echld_child_loop() {
int parent_fd = child.fds.pipe_to_parent;
#ifdef DEBUG_CHILD
int step = 0;
#endif
CHILD_DBG((0,"child_loop()"));
do {
fd_set rfds;
fd_set wfds;
fd_set efds;
struct timeval timeout;
struct dispatcher_child* c;
int nfds;
FD_ZERO(&rfds);
FD_ZERO(&wfds);
FD_ZERO(&efds);
FD_SET(parent_fd,&rfds);
if (child.fds.pipe_from_dumpcap > 0) {
FD_SET(child.fds.pipe_from_dumpcap,&rfds);
}
if (child.fds.file_being_read > 0) {
FD_SET(child.fds.file_being_read,&rfds);
}
CHILD_DBG((4,"child_loop: before select() step=%d",step++));
nfds = select(nfds, &rfds, &wfds, &efds, &timeout);
CHILD_DBG((5,"child_loop: after select() step=%d",step++));
if ( FD_ISSET(parent_fd,&efds) ) {
CHILD_DBG((0,"Broken Parent Pipe step=%d",step++));
break;
}
if (child.fds.pipe_from_dumpcap > 0 && FD_ISSET(child.fds.pipe_from_dumpcap,&efds) ) {
CHILD_DBG((0,"Broken Dumpcap Pipe step=%d",step++));
break;
}
if (child.fds.file_being_read > 0 && FD_ISSET(child.fds.file_being_read,&efds) ) {
CHILD_DBG((0,"Broken Readfile Pipe step=%d",step++));
break;
}
if (FD_ISSET(parent_fd, &rfds)) {
int st = echld_read_frame(&(child.parent), child_receive, &child);
if (st < 0) {
CHILD_DBG((0,"Read Frame Failed step=%d",step++));
return st;
}
}
if (child.fds.pipe_from_dumpcap > 0 && FD_ISSET(child.fds.pipe_from_dumpcap,&rfds) ) {
child_dumpcap_read();
}
if (child.fds.file_being_read > 0 && FD_ISSET(child.fds.pipe_from_dumpcap,&rfds) ) {
child_read_file();
}
} while(1);
CHILD_RESP(NULL,ECHLD_CLOSING);
CHILD_DBG((3,"Closing"));
return 222;
}
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