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#include <dlfcn.h>
#include <stdlib.h>
#include <string.h>
#include <bglibs/msg.h>
#include "mailfront-internal.h"
#include "conf_modules.c"
static response resp_load = { 451, 0 };
static RESPONSE(backend_version,451,"4.3.0 Backend ABI version mismatch");
static RESPONSE(plugin_version,451,"4.3.0 Plugin ABI version mismatch");
static RESPONSE(protocol_version,451,"4.3.0 Protocol ABI version mismatch");
static void append_plugin(struct plugin* plugin)
{
plugin->next = 0;
if (session.plugin_tail == 0)
session.plugin_list = plugin;
else
session.plugin_tail->next = plugin;
session.plugin_tail = plugin;
}
static void prepend_plugin(struct plugin* plugin)
{
plugin->next = session.plugin_list;
session.plugin_list = plugin;
if (session.plugin_tail == 0)
session.plugin_tail = plugin;
}
static struct plugin* remove_plugin(const char* name)
{
struct plugin* curr;
struct plugin* prev;
if (name[0] == '*' && name[1] == 0)
session.plugin_list = session.plugin_tail = 0;
else {
for (prev = 0, curr = session.plugin_list;
curr != 0;
prev = curr, curr = curr->next) {
if (strcmp(curr->name, name) == 0) {
if (((prev == 0)
? (session.plugin_list = curr->next)
: (prev->next = curr->next)) == 0)
session.plugin_tail = prev;
return curr;
}
}
}
return 0;
}
static void* load_object(const char* type,
const char* name)
{
static str tmpstr;
void* handle;
void* ptr;
str_copyf(&tmpstr, "s{/}s{-}s{.so}", session.module_path, type, name);
if ((handle = dlopen(tmpstr.s, RTLD_NOW | RTLD_LOCAL)) == 0
|| (ptr = dlsym(handle, type)) == 0) {
str_copyf(&tmpstr, "{4.3.0 Error loading }s{ }s{: }s",
type, name, dlerror());
resp_load.message = tmpstr.s;
return 0;
}
return ptr;
}
static struct plugin* find_builtin_plugin(const char* name)
{
int i;
for (i = 0; builtin_plugins[i].name != 0; ++i) {
if (strcmp(builtin_plugins[i].name, name) == 0)
return &builtin_plugins[i];
}
return 0;
}
const response* load_plugin(struct plugin** pptr, const char* name)
{
struct plugin* plugin;
if ((plugin = find_builtin_plugin(name)) == 0) {
if ((plugin = load_object("plugin", name)) == 0)
return &resp_load;
if (plugin->version != PLUGIN_VERSION)
return &resp_plugin_version;
if ((plugin->name = strdup(name)) == 0)
return &resp_oom;
}
*pptr = plugin;
return 0;
}
static const response* load_add_plugin(const char* name)
{
struct plugin* plugin;
const response* r;
void (*add)(struct plugin*);
if (name[0] == '-') {
remove_plugin(++name);
return 0;
}
if (name[0] == '+') {
++name;
add = prepend_plugin;
}
else
add = append_plugin;
if ((plugin = remove_plugin(name)) == 0) {
if ((r = load_plugin(&plugin, name)) != 0)
return r;
}
add(plugin);
session.flags |= plugin->flags;
return 0;
}
static const response* load_plugins(const char* list)
{
const char* start;
const char* end;
long len;
const response* resp;
for (start = list; *start != 0; start = end) {
end = start;
while (*end != 0 && *end != ':')
++end;
len = end - start;
if (len > 0) {
char copy[len+1];
memcpy(copy, start, len);
copy[len] = 0;
if ((resp = load_add_plugin(copy)) != 0)
return resp;
}
if (*end == ':')
++end;
}
return 0;
}
const response* load_backend(struct plugin** bptr, const char* name)
{
struct plugin* backend;
if ((backend = load_object("backend", name)) == 0)
return &resp_load;
if (backend->version != PLUGIN_VERSION)
return &resp_backend_version;
*bptr = backend;
return 0;
}
struct plugin* switch_backend(struct plugin* backend)
{
struct plugin* old;
old = session.backend;
session.backend = backend;
session.flags |= backend->flags;
return old;
}
const response* load_modules(const char* protocol_name,
const char* backend_name,
const char** plugins)
{
const char* env;
const response* r;
if ((session.module_path = getenv("MODULE_PATH")) == 0)
session.module_path = conf_modules;
if ((session.protocol = load_object("protocol", protocol_name)) == 0)
return &resp_load;
if (session.protocol->version != PROTOCOL_VERSION)
return &resp_protocol_version;
if ((r = load_backend(&session.backend, backend_name)) != 0)
return r;
session.flags |= session.backend->flags;
while (*plugins != 0)
if ((r = load_plugins(*plugins++)) != 0)
return r;
if ((env = getenv("PLUGINS")) != 0)
return load_plugins(env);
return 0;
}
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