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#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include "websocksy.h"
#include "config.h"
#include "plugin.h"
/* Configuration file parser state */
static enum /*_config_file_section*/ {
cfg_main,
cfg_backend
} config_section = cfg_main;
/* Evaluate a single line within a configuration file */
static int config_file_line(ws_config* config, char* key, char* value, size_t line_no){
if(!strcmp(key, "port")){
free(config->port);
config->port = strdup(value);
}
else if(!strcmp(key, "listen")){
free(config->host);
config->host = strdup(value);
}
else if(!strcmp(key, "ping")){
config->ping_interval = strtoul(value, NULL, 10);
}
else if(!strcmp(key, "verbosity")){
config->verbosity = strtoul(value, NULL, 10);
}
else if(!strcmp(key, "backend")){
//clean up the previously registered backend
if(config->backend.cleanup){
config->backend.cleanup();
}
//load the backend plugin
if(plugin_backend_load(PLUGINS, value, &(config->backend))){
return 1;
}
if(config->backend.init() != WEBSOCKSY_API_VERSION){
fprintf(stderr, "Loaded backend %s was built for a different API version\n", value);
return 1;
}
}
return 0;
}
/* Read and parse a configuration file */
int config_parse_file(ws_config* config, char* filename){
ssize_t line_current;
size_t line_alloc = 0, line_no = 1, key_len;
char* line = NULL, *key, *value;
FILE* input = fopen(filename, "r");
if(!input){
fprintf(stderr, "Failed to open %s as configuration file\n", filename);
return 1;
}
for(line_current = getline(&line, &line_alloc, input); line_current >= 0; line_current = getline(&line, &line_alloc, input)){
if(!strncmp(line, "[core]", 6)){
config_section = cfg_main;
}
else if(!strncmp(line, "[backend]", 9)){
config_section = cfg_backend;
}
else if(line_current > 0){
//right-trim newlines & spaces from value
for(line_current--; line_current && isspace(line[line_current]); line_current--){
line[line_current] = 0;
}
if(line_current > 0){
//left-trim key
for(key = line; *key && isspace(key[0]); key++){
}
value = strchr(key, '=');
if(value){
*value = 0;
//left-trim value
for(value++; *value && isspace(value[0]); value++){
}
//right-trim key
for(key_len = strlen(key) - 1; *key && key_len && isspace(key[key_len]); key_len--){
key[key_len] = 0;
}
switch(config_section){
case cfg_main:
if(config_file_line(config, key, value, line_no)){
free(line);
fclose(input);
return 1;
}
break;
case cfg_backend:
if(config->backend.config(key, value)){
fprintf(stderr, "Backend configuration failed in %s line %lu\n", filename, line_no);
free(line);
fclose(input);
return 1;
}
break;
}
}
}
}
line_no++;
}
free(line);
fclose(input);
return 0;
}
/* Parse an argument list */
int config_parse_arguments(ws_config* config, int argc, char** argv){
size_t u;
char* option = NULL, *value = NULL;
//if exactly one argument, treat it as config file
if(argc == 1){
return config_parse_file(config, argv[0]);
}
if(argc % 2){
return 1;
}
for(u = 0; u < argc; u += 2){
if(argv[u][0] != '-'){
return 1;
}
switch(argv[u][1]){
case 'p':
config_file_line(config, "port", argv[u + 1], 0);
break;
case 'l':
config_file_line(config, "listen", argv[u + 1], 0);
break;
case 'b':
config_file_line(config, "backend", argv[u + 1], 0);
break;
case 'k':
config_file_line(config, "ping", argv[u + 1], 0);
break;
case 'c':
if(!strchr(argv[u + 1], '=')){
return 1;
}
if(!config->backend.config){
continue;
}
option = strdup(argv[u + 1]);
value = strchr(option, '=');
*value = 0;
value++;
config->backend.config(option, value);
free(option);
option = NULL;
value = NULL;
break;
}
}
return 0;
}
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