source: ogServer-Git/src/cfg.c

/*
 * Copyright (C) 2020-2021 Soleta Networks <info@soleta.eu>
 *
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the
 * Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 */

#include "json.h"
#include "cfg.h"
#include "ogAdmServer.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <syslog.h>

static int parse_json_rest(struct og_server_cfg *cfg, json_t *element)
{
        const char *key;
        json_t *value;

        json_object_foreach(element, key, value) {
                if (!strcmp(key, "ip")) {
                        if (og_json_parse_string(value, &cfg->rest.ip) < 0)
                                return -1;
                } else if (!strcmp(key, "port")) {
                        if (og_json_parse_string(value, &cfg->rest.port) < 0)
                                return -1;
                } else if (!strcmp(key, "api_token")) {
                        if (og_json_parse_string(value, &cfg->rest.api_token) < 0)
                                return -1;
                } else {
                        syslog(LOG_ERR, "unknown key `%s' in rest\n", key);
                        return -1;
                }
        }

        return 0;
}

static int parse_json_db(struct og_server_cfg *cfg, json_t *element)
{
        const char *key;
        json_t *value;

        json_object_foreach(element, key, value) {
                if (!strcmp(key, "ip")) {
                        if (og_json_parse_string(value, &cfg->db.ip) < 0)
                                return -1;
                } else if (!strcmp(key, "user")) {
                        if (og_json_parse_string(value, &cfg->db.user) < 0)
                                return -1;
                } else if (!strcmp(key, "pass")) {
                        if (og_json_parse_string(value, &cfg->db.pass) < 0)
                                return -1;
                } else if (!strcmp(key, "name")) {
                        if (og_json_parse_string(value, &cfg->db.name) < 0)
                                return -1;
                } else if (!strcmp(key, "port")) {
                        if (og_json_parse_string(value, &cfg->db.port) < 0)
                                return -1;
                } else {
                        syslog(LOG_ERR, "unknown key `%s' in db\n", key);
                        return -1;
                }
        }

        return 0;
}

static int parse_json_wol(struct og_server_cfg *cfg, json_t *element)
{
        const char *key;
        json_t *value;

        json_object_foreach(element, key, value) {
                if (!strcmp(key, "interface")) {
                        if (og_json_parse_string(value, &cfg->wol.interface) < 0)
                                return -1;
                } else {
                        syslog(LOG_ERR, "unknown key `%s' in wol\n", key);
                        return -1;
                }
        }

        return 0;
}

static int parse_json_repo(struct og_server_cfg *cfg, json_t *element)
{
        const char *key;
        json_t *value;

        json_object_foreach(element, key, value) {
                if (!strcmp(key, "directory")) {
                        if (og_json_parse_string(value, &cfg->repo.dir) < 0)
                                return -1;
                } else {
                        syslog(LOG_ERR, "unknown key `%s' in repo\n", key);
                        return -1;
                }
        }

        return 0;
}

#define OG_SERVER_CFG_REST      (1 << 0)
#define OG_SERVER_CFG_DB        (1 << 1)
#define OG_SERVER_CFG_WOL       (1 << 2)
#define OG_SERVER_CFG_REPO      (1 << 3)

int parse_json_config(const char *filename, struct og_server_cfg *cfg)
{
        json_t *root, *value;
        uint32_t flags = 0;
        json_error_t err;
        const char *key;
        char buf[4096];
        int fd, ret;

        fd = open(filename, O_RDONLY);
        if (fd < 0) {
                syslog(LOG_ERR, "Cannot open %s", filename);
                return -1;
        }

        ret = read(fd, buf, sizeof(buf));
        if (ret < 0 || ret == sizeof(buf)) {
                syslog(LOG_ERR, "Cannot read from %s", filename);
                return -1;
        }

        root = json_loads(buf, 0, &err);
        if (!root) {
                syslog(LOG_ERR, "Cannot parse malformed json file");
                return -1;
        }

        json_object_foreach(root, key, value) {
                if (!strcmp(key, "rest")) {
                        if (parse_json_rest(cfg, value) < 0) {
                                ret = -1;
                                break;
                        }
                        flags |= OG_SERVER_CFG_REST;
                } else if (!strcmp(key, "wol")) {
                        if (parse_json_wol(cfg, value) < 0) {
                                ret = -1;
                                break;
                        }
                        flags |= OG_SERVER_CFG_WOL;
                } else if (!strcmp(key, "database")) {
                        if (parse_json_db(cfg, value) < 0) {
                                ret = -1;
                                break;
                        }
                        flags |= OG_SERVER_CFG_DB;
                } else if (!strcmp(key, "repository")) {
                        if (parse_json_repo(cfg, value) < 0)
                                return -1;

                        flags |= OG_SERVER_CFG_REPO;
                } else {
                        syslog(LOG_ERR, "unknown key `%s' in %s\n",
                               key, filename);
                        ret = -1;
                }
        }

        if (ret < 0)
                json_decref(root);

        if ((flags & OG_SERVER_CFG_REST) &&
            (flags & OG_SERVER_CFG_DB) &&
            (flags & OG_SERVER_CFG_WOL)) {
                ret = 0;
        } else {
                syslog(LOG_ERR, "Missing attributes in json file");
                ret = -1;
        }

        if (ret < 0)
                json_decref(root);
        else
                cfg->json = root;

        return ret;
}