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#include "uwsgi.h"
extern struct uwsgi_server uwsgi;
#ifdef UWSGI_ELF
static void uwsgi_plugin_parse_section(char *filename) {
size_t s_len = 0;
char *buf = uwsgi_elf_section(filename, "uwsgi", &s_len);
if (buf) {
char *ctx = NULL;
char *p = strtok_r(buf, "\n", &ctx);
while (p) {
char *equal = strchr(p, '=');
if (equal) {
*equal = 0;
if (!strcmp(p, "requires")) {
if (!plugin_already_loaded(equal+1)) {
uwsgi_load_plugin(-1, equal + 1, NULL);
}
}
}
p = strtok_r(NULL, "\n", &ctx);
}
free(buf);
}
}
#endif
struct uwsgi_plugin *uwsgi_plugin_get(const char *plugin) {
int i;
for (i = 0; i < 256; i++) {
if (uwsgi.p[i]->name) {
if (!strcmp(plugin, uwsgi.p[i]->name)) {
#ifdef UWSGI_DEBUG
uwsgi_log("%s plugin already available\n", plugin);
#endif
return uwsgi.p[i];
}
}
if (uwsgi.p[i]->alias) {
if (!strcmp(plugin, uwsgi.p[i]->alias)) {
#ifdef UWSGI_DEBUG
uwsgi_log("%s plugin already available\n", plugin);
#endif
return uwsgi.p[i];
}
}
}
for (i = 0; i < uwsgi.gp_cnt; i++) {
if (uwsgi.gp[i]->name) {
if (!strcmp(plugin, uwsgi.gp[i]->name)) {
#ifdef UWSGI_DEBUG
uwsgi_log("%s plugin already available\n", plugin);
#endif
return uwsgi.p[i];
}
}
if (uwsgi.gp[i]->alias) {
if (!strcmp(plugin, uwsgi.gp[i]->alias)) {
#ifdef UWSGI_DEBUG
uwsgi_log("%s plugin already available\n", plugin);
#endif
return uwsgi.p[i];
}
}
}
return NULL;
}
int plugin_already_loaded(const char *plugin) {
struct uwsgi_plugin *up = uwsgi_plugin_get(plugin);
if (up) return 1;
return 0;
}
void *uwsgi_load_plugin(int modifier, char *plugin, char *has_option) {
void *plugin_handle = NULL;
char *plugin_abs_path = NULL;
char *plugin_filename = NULL;
int need_free = 0;
char *plugin_name = uwsgi_strip(uwsgi_str(plugin));
char *plugin_symbol_name_start;
struct uwsgi_plugin *up;
char linkpath_buf[1024], linkpath[1024];
int linkpath_size;
char *colon = strchr(plugin_name, ':');
if (colon) {
colon[0] = 0;
modifier = atoi(plugin_name);
plugin_name = colon + 1;
colon[0] = ':';
}
char *init_func = strchr(plugin_name, '|');
if (init_func) {
init_func[0] = 0;
init_func++;
}
if (!uwsgi_endswith(plugin_name, "_plugin.so")) {
plugin_name = uwsgi_concat2(plugin_name, "_plugin.so");
need_free = 1;
}
plugin_symbol_name_start = plugin_name;
// step 1: check for absolute plugin (stop if it fails)
if (strchr(plugin_name, '/')) {
#ifdef UWSGI_ELF
uwsgi_plugin_parse_section(plugin_name);
#endif
plugin_handle = dlopen(plugin_name, RTLD_NOW | RTLD_GLOBAL);
if (!plugin_handle) {
if (!has_option)
uwsgi_log("%s\n", dlerror());
goto end;
}
plugin_symbol_name_start = uwsgi_get_last_char(plugin_name, '/');
plugin_symbol_name_start++;
plugin_abs_path = plugin_name;
goto success;
}
// step dir, check for user-supplied plugins directory
struct uwsgi_string_list *pdir = uwsgi.plugins_dir;
while (pdir) {
plugin_filename = uwsgi_concat3(pdir->value, "/", plugin_name);
#ifdef UWSGI_ELF
uwsgi_plugin_parse_section(plugin_filename);
#endif
plugin_handle = dlopen(plugin_filename, RTLD_NOW | RTLD_GLOBAL);
if (plugin_handle) {
plugin_abs_path = plugin_filename;
//free(plugin_filename);
goto success;
}
free(plugin_filename);
plugin_filename = NULL;
pdir = pdir->next;
}
// last step: search in compile-time plugin_dir
if (!plugin_handle) {
plugin_filename = uwsgi_concat3(UWSGI_PLUGIN_DIR, "/", plugin_name);
#ifdef UWSGI_ELF
uwsgi_plugin_parse_section(plugin_filename);
#endif
plugin_handle = dlopen(plugin_filename, RTLD_NOW | RTLD_GLOBAL);
plugin_abs_path = plugin_filename;
//free(plugin_filename);
}
success:
if (!plugin_handle) {
if (!has_option)
uwsgi_log("!!! UNABLE to load uWSGI plugin: %s !!!\n", dlerror());
}
else {
if (init_func) {
void (*plugin_init_func)() = dlsym(plugin_handle, init_func);
if (plugin_init_func) {
plugin_init_func();
}
}
char *plugin_entry_symbol = uwsgi_concat2n(plugin_symbol_name_start, strlen(plugin_symbol_name_start) - 3, "", 0);
up = dlsym(plugin_handle, plugin_entry_symbol);
if (!up) {
// is it a link ?
memset(linkpath_buf, 0, 1024);
memset(linkpath, 0, 1024);
if ((linkpath_size = readlink(plugin_abs_path, linkpath_buf, 1023)) > 0) {
do {
linkpath_buf[linkpath_size] = '\0';
strncpy(linkpath, linkpath_buf, linkpath_size + 1);
} while ((linkpath_size = readlink(linkpath, linkpath_buf, 1023)) > 0);
#ifdef UWSGI_DEBUG
uwsgi_log("%s\n", linkpath);
#endif
free(plugin_entry_symbol);
char *slash = uwsgi_get_last_char(linkpath, '/');
if (!slash) {
slash = linkpath;
}
else {
slash++;
}
plugin_entry_symbol = uwsgi_concat2n(slash, strlen(slash) - 3, "", 0);
up = dlsym(plugin_handle, plugin_entry_symbol);
}
}
if (up) {
if (!up->name) {
uwsgi_log("the loaded plugin (%s) has no .name attribute\n", plugin_name);
if (dlclose(plugin_handle)) {
uwsgi_error("dlclose()");
}
if (need_free)
free(plugin_name);
if (plugin_filename)
free(plugin_filename);
free(plugin_entry_symbol);
return NULL;
}
if (plugin_already_loaded(up->name)) {
if (dlclose(plugin_handle)) {
uwsgi_error("dlclose()");
}
if (need_free)
free(plugin_name);
if (plugin_filename)
free(plugin_filename);
free(plugin_entry_symbol);
return NULL;
}
if (has_option) {
struct uwsgi_option *op = up->options;
int found = 0;
while (op && op->name) {
if (!strcmp(has_option, op->name)) {
found = 1;
break;
}
op++;
}
if (!found) {
if (dlclose(plugin_handle)) {
uwsgi_error("dlclose()");
}
if (need_free)
free(plugin_name);
if (plugin_filename)
free(plugin_filename);
free(plugin_entry_symbol);
return NULL;
}
}
if (modifier != -1) {
fill_plugin_table(modifier, up);
up->modifier1 = modifier;
}
else {
fill_plugin_table(up->modifier1, up);
}
if (need_free)
free(plugin_name);
if (plugin_filename)
free(plugin_filename);
free(plugin_entry_symbol);
if (up->on_load)
up->on_load();
return plugin_handle;
}
if (!has_option)
uwsgi_log("%s\n", dlerror());
}
end:
if (need_free)
free(plugin_name);
if (plugin_filename)
free(plugin_filename);
return NULL;
}
int uwsgi_try_autoload(char *option) {
DIR *d;
struct dirent *dp;
// step dir, check for user-supplied plugins directory
struct uwsgi_string_list *pdir = uwsgi.plugins_dir;
while (pdir) {
d = opendir(pdir->value);
if (d) {
while ((dp = readdir(d)) != NULL) {
if (uwsgi_endswith(dp->d_name, "_plugin.so")) {
char *filename = uwsgi_concat3(pdir->value, "/", dp->d_name);
if (uwsgi_load_plugin(-1, filename, option)) {
uwsgi_log("option \"%s\" found in plugin %s\n", option, filename);
free(filename);
closedir(d);
// add new options
build_options();
return 1;
}
free(filename);
}
}
closedir(d);
}
pdir = pdir->next;
}
// last step: search in compile-time plugin_dir
d = opendir(UWSGI_PLUGIN_DIR);
if (!d)
return 0;
while ((dp = readdir(d)) != NULL) {
if (uwsgi_endswith(dp->d_name, "_plugin.so")) {
char *filename = uwsgi_concat3(UWSGI_PLUGIN_DIR, "/", dp->d_name);
if (uwsgi_load_plugin(-1, filename, option)) {
uwsgi_log("option \"%s\" found in plugin %s\n", option, filename);
free(filename);
closedir(d);
// add new options
build_options();
return 1;
}
free(filename);
}
}
closedir(d);
return 0;
}
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