/*******************************************************************************
* Copyright (c) 2010 Wind River Systems, Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v1.0 which accompany this distribution.
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
/*
* Path Map service.
* The service manages file path mapping rules.
*/
#include "config.h"
#if SERVICE_PathMap
#include <stdio.h>
#include "json.h"
#include "events.h"
#include "exceptions.h"
#include "myalloc.h"
#include "pathmap.h"
typedef struct PathMapRule {
struct {
char * name;
char * value;
char * json;
} * attrs;
unsigned attrs_cnt;
unsigned attrs_max;
} PathMapRule;
typedef struct PathMap {
LINK maps;
Channel * channel;
PathMapRule * rules;
unsigned rules_cnt;
unsigned rules_max;
} PathMap;
#define maps2map(x) ((PathMap *)((char *)(x) - offsetof(PathMap, maps)))
static const char PATH_MAP[] = "PathMap";
static LINK maps;
static char host_name[256];
static PathMap * find_map(Channel * c) {
LINK * l;
for (l = maps.next; l != &maps; l = l->next) {
PathMap * m = maps2map(l);
if (m->channel == c) return m;
}
return NULL;
}
static void flush_host_name(void * args) {
memset(host_name, 0, sizeof(host_name));
}
static int is_my_host(char * host) {
if (host == NULL) return 1;
if (host_name[0] == 0) {
gethostname(host_name, sizeof(host_name));
if (host_name[0] != 0) post_event_with_delay(flush_host_name, NULL, 1000000);
}
return strcasecmp(host, host_name) == 0;
}
char * path_map_to_local(Channel * c, char * fnm) {
unsigned i, j, k;
PathMap * m = find_map(c);
static char buf[FILE_PATH_SIZE];
if (m == NULL) return NULL;
for (i = 0; i < m->rules_cnt; i++) {
PathMapRule * r = m->rules + i;
char * src = NULL;
char * dst = NULL;
char * host = NULL;
char * prot = NULL;
for (j = 0; j < r->attrs_cnt; j++) {
char * nm = r->attrs[j].name;
if (strcmp(nm, "Source") == 0) src = r->attrs[j].value;
else if (strcmp(nm, "Destination") == 0) dst = r->attrs[j].value;
else if (strcmp(nm, "Protocol") == 0) prot = r->attrs[j].value;
else if (strcmp(nm, "Host") == 0) host = r->attrs[j].value;
}
if (src == NULL || dst == NULL) continue;
if (prot != NULL && strcasecmp(prot, "file")) continue;
if (!is_my_host(host)) continue;
k = strlen(src);
if (strncmp(src, fnm, k)) continue;
if (fnm[k] != 0 && fnm[k] != '/' && fnm[k] != '\\') continue;
snprintf(buf, sizeof(buf), "%s%s", dst, fnm + k);
return buf;
}
return NULL;
}
static void write_rule(OutputStream * out, PathMapRule * r) {
unsigned i = 0;
write_stream(out, '{');
for (i = 0; i < r->attrs_cnt; i++) {
if (i > 0) write_stream(out, ',');
json_write_string(out, r->attrs[i].name);
write_stream(out, ':');
if (r->attrs[i].value) json_write_string(out, r->attrs[i].value);
else write_string(out, r->attrs[i].json);
}
write_stream(out, '}');
}
static void read_rule_attrs(InputStream * inp, char * name, void * args) {
PathMapRule * r = args;
if (r->attrs_cnt >= r->attrs_max) {
r->attrs_max = r->attrs_max ? r->attrs_max * 2 : 8;
r->attrs = loc_realloc(r->attrs, r->attrs_max * sizeof(*r->attrs));
}
memset(r->attrs + r->attrs_cnt, 0, sizeof(*r->attrs));
if (peek_stream(inp) == '"') {
r->attrs[r->attrs_cnt].value = json_read_alloc_string(inp);
}
else {
r->attrs[r->attrs_cnt].json = json_skip_object(inp);
}
r->attrs[r->attrs_cnt++].name = loc_strdup(name);
}
static void read_rule(InputStream * inp, void * args) {
PathMap * m = args;
PathMapRule * r = NULL;
if (m->rules_cnt >= m->rules_max) {
m->rules_max = m->rules_max ? m->rules_max * 2 : 8;
m->rules = loc_realloc(m->rules, m->rules_max * sizeof(*m->rules));
}
r = m->rules + m->rules_cnt;
memset(r, 0, sizeof(*r));
if (json_read_struct(inp, read_rule_attrs, r)) m->rules_cnt++;
}
static void command_get(char * token, Channel * c) {
PathMap * m = find_map(c);
if (read_stream(&c->inp) != MARKER_EOM) exception(ERR_JSON_SYNTAX);
write_stringz(&c->out, "R");
write_stringz(&c->out, token);
write_errno(&c->out, 0);
if (m == NULL) {
write_stringz(&c->out, "null");
}
else {
unsigned i;
write_stream(&c->out, '[');
for (i = 0; i < m->rules_cnt; i++) {
PathMapRule * r = m->rules + i;
if (i > 0) write_stream(&c->out, ',');
write_rule(&c->out, r);
}
write_stream(&c->out, ']');
write_stream(&c->out, 0);
}
write_stream(&c->out, MARKER_EOM);
}
static void command_set(char * token, Channel * c) {
PathMap * m = find_map(c);
if (m == NULL) {
m = loc_alloc_zero(sizeof(PathMap));
m->channel = c;
list_add_first(&m->maps, &maps);
}
else {
unsigned i, j;
for (i = 0; i < m->rules_cnt; i++) {
PathMapRule * r = m->rules + i;
for (j = 0; j < r->attrs_cnt; j++) {
loc_free(r->attrs[j].name);
loc_free(r->attrs[j].value);
loc_free(r->attrs[j].json);
}
r->attrs_cnt = 0;
}
m->rules_cnt = 0;
}
json_read_array(&c->inp, read_rule, m);
if (read_stream(&c->inp) != 0) exception(ERR_JSON_SYNTAX);
if (read_stream(&c->inp) != MARKER_EOM) exception(ERR_JSON_SYNTAX);
write_stringz(&c->out, "R");
write_stringz(&c->out, token);
write_errno(&c->out, 0);
write_stream(&c->out, MARKER_EOM);
}
static void channel_close_listener(Channel * c) {
unsigned i, j;
PathMap * m = NULL;
/* Keep path map over channel redirection */
if (c->state == ChannelStateHelloReceived) return;
m = find_map(c);
if (m == NULL) return;
list_remove(&m->maps);
for (i = 0; i < m->rules_cnt; i++) {
PathMapRule * r = m->rules + i;
for (j = 0; j < r->attrs_cnt; j++) {
loc_free(r->attrs[j].name);
loc_free(r->attrs[j].value);
loc_free(r->attrs[j].json);
}
loc_free(r->attrs);
}
loc_free(m->rules);
loc_free(m);
}
void ini_path_map_service(Protocol * proto, TCFBroadcastGroup * bcg) {
list_init(&maps);
add_channel_close_listener(channel_close_listener);
add_command_handler(proto, PATH_MAP, "get", command_get);
add_command_handler(proto, PATH_MAP, "set", command_set);
}
#endif /* SERVICE_PathMap */
