diff options
Diffstat (limited to 'httpd/http_server.c')
| -rw-r--r-- | httpd/http_server.c | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/httpd/http_server.c b/httpd/http_server.c new file mode 100644 index 000000000..24b168d92 --- /dev/null +++ b/httpd/http_server.c @@ -0,0 +1,339 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "daemon/common.h" +#include "http_server.h" +#include "h2o.h" + +#include "h2o_utils.h" + +static h2o_globalconf_t config; +static h2o_context_t ctx; +static h2o_accept_ctx_t accept_ctx; + +#define CONTENT_JSON_UTF8 H2O_STRLIT("application/json; charset=utf-8") +#define CONTENT_TEXT_UTF8 H2O_STRLIT("text/plain; charset=utf-8") +#define NBUF_INITIAL_SIZE_RESP (4096) +#define API_V1_PREFIX "/api/v1/" +#define HOST_SELECT_PREFIX "/host/" + +#define HTTPD_CONFIG_SECTION "httpd" +#define HTTPD_ENABLED_DEFAULT false + +static void on_accept(h2o_socket_t *listener, const char *err) +{ + h2o_socket_t *sock; + + if (err != NULL) { + return; + } + + if ((sock = h2o_evloop_socket_accept(listener)) == NULL) + return; + h2o_accept(&accept_ctx, sock); +} + +static int create_listener(const char *ip, int port) +{ + struct sockaddr_in addr; + int fd, reuseaddr_flag = 1; + h2o_socket_t *sock; + + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_addr.s_addr = inet_addr(ip); + addr.sin_port = htons(port); + + if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1 || + setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuseaddr_flag, sizeof(reuseaddr_flag)) != 0 || + bind(fd, (struct sockaddr *)&addr, sizeof(addr)) != 0 || listen(fd, SOMAXCONN) != 0) { + return -1; + } + + sock = h2o_evloop_socket_create(ctx.loop, fd, H2O_SOCKET_FLAG_DONT_READ); + h2o_socket_read_start(sock, on_accept); + + return 0; +} + +static int ssl_init() +{ + if (!config_get_boolean(HTTPD_CONFIG_SECTION, "ssl", false)) + return 0; + + char default_fn[FILENAME_MAX + 1]; + + snprintfz(default_fn, FILENAME_MAX, "%s/ssl/key.pem", netdata_configured_user_config_dir); + const char *key_fn = config_get(HTTPD_CONFIG_SECTION, "ssl key", default_fn); + + snprintfz(default_fn, FILENAME_MAX, "%s/ssl/cert.pem", netdata_configured_user_config_dir); + const char *cert_fn = config_get(HTTPD_CONFIG_SECTION, "ssl certificate", default_fn); + +#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110 + accept_ctx.ssl_ctx = SSL_CTX_new(SSLv23_server_method()); +#else + accept_ctx.ssl_ctx = SSL_CTX_new(TLS_server_method()); +#endif + + SSL_CTX_set_options(accept_ctx.ssl_ctx, SSL_OP_NO_SSLv2); + + /* load certificate and private key */ + if (SSL_CTX_use_PrivateKey_file(accept_ctx.ssl_ctx, key_fn, SSL_FILETYPE_PEM) != 1) { + error("Could not load server key from \"%s\"", key_fn); + return -1; + } + if (SSL_CTX_use_certificate_file(accept_ctx.ssl_ctx, cert_fn, SSL_FILETYPE_PEM) != 1) { + error("Could not load certificate from \"%s\"", cert_fn); + return -1; + } + + h2o_ssl_register_alpn_protocols(accept_ctx.ssl_ctx, h2o_http2_alpn_protocols); + + info("SSL support enabled"); + + return 0; +} + +// I did not find a way to do wildcard paths to make common handler for urls like: +// /api/v1/info +// /host/child/api/v1/info +// /host/uuid/api/v1/info +// ideally we could do something like "/*/api/v1/info" subscription +// so we do it "manually" here with uberhandler +static inline int _netdata_uberhandler(h2o_req_t *req, RRDHOST **host) +{ + if (!h2o_memis(req->method.base, req->method.len, H2O_STRLIT("GET"))) + return -1; + + static h2o_generator_t generator = { NULL, NULL }; + + h2o_iovec_t norm_path = req->path_normalized; + + if (norm_path.len > strlen(HOST_SELECT_PREFIX) && !memcmp(norm_path.base, HOST_SELECT_PREFIX, strlen(HOST_SELECT_PREFIX))) { + h2o_iovec_t host_id; // host_id can be either and UUID or a hostname of the child + + norm_path.base += strlen(HOST_SELECT_PREFIX); + norm_path.len -= strlen(HOST_SELECT_PREFIX); + + host_id = norm_path; + + size_t end_loc = h2o_strstr(host_id.base, host_id.len, "/", 1); + if (end_loc != SIZE_MAX) { + host_id.len = end_loc; + norm_path.base += end_loc; + norm_path.len -= end_loc; + } + + char *c_host_id = iovec_to_cstr(&host_id); + *host = rrdhost_find_by_hostname(c_host_id); + if (!*host) + *host = rrdhost_find_by_guid(c_host_id); + if (!*host) { + req->res.status = HTTP_RESP_BAD_REQUEST; + req->res.reason = "Wrong host id"; + h2o_send_inline(req, H2O_STRLIT("Host id provided was not found!\n")); + freez(c_host_id); + return 0; + } + freez(c_host_id); + + // we have to rewrite URL here in case this is not an api call + // so that the subsequent file upload handler can send the correct + // files to the client + // if this is not an API call we will abort this handler later + // and let the internal serve file handler of h2o care for things + + if (end_loc == SIZE_MAX) { + req->path.len = 1; + req->path_normalized.len = 1; + } else { + size_t offset = norm_path.base - req->path_normalized.base; + req->path.len -= offset; + req->path.base += offset; + req->query_at -= offset; + req->path_normalized.len -= offset; + req->path_normalized.base += offset; + } + } + + // workaround for a dashboard bug which causes sometimes urls like + // "//api/v1/info" to be caled instead of "/api/v1/info" + if (norm_path.len > 2 && + norm_path.base[0] == '/' && + norm_path.base[1] == '/' ) { + norm_path.base++; + norm_path.len--; + } + + size_t api_loc = h2o_strstr(norm_path.base, norm_path.len, H2O_STRLIT(API_V1_PREFIX)); + if (api_loc == SIZE_MAX) + return 1; + + h2o_iovec_t api_command = norm_path; + api_command.base += api_loc + strlen(API_V1_PREFIX); + api_command.len -= api_loc + strlen(API_V1_PREFIX); + + if (!api_command.len) + return 1; + + // this (emulating struct web_client) is a hack and will be removed + // in future PRs but needs bigger changes in old http_api_v1 + // we need to make the web_client_api_request_v1 to be web server + // agnostic and remove the old webservers dependency creep into the + // individual response generators and thus remove the need to "emulate" + // the old webserver calling this function here and in ACLK + struct web_client w; + w.response.data = buffer_create(NBUF_INITIAL_SIZE_RESP, NULL); + w.response.header = buffer_create(NBUF_INITIAL_SIZE_RESP, NULL); + w.url_query_string_decoded = buffer_create(NBUF_INITIAL_SIZE_RESP, NULL); + w.acl = WEB_CLIENT_ACL_DASHBOARD; + + char *path_c_str = iovec_to_cstr(&api_command); + char *path_unescaped = url_unescape(path_c_str); + freez(path_c_str); + + IF_HAS_URL_PARAMS(req) { + h2o_iovec_t query_params = URL_PARAMS_IOVEC_INIT_WITH_QUESTIONMARK(req); + char *query_c_str = iovec_to_cstr(&query_params); + char *query_unescaped = url_unescape(query_c_str); + freez(query_c_str); + buffer_strcat(w.url_query_string_decoded, query_unescaped); + freez(query_unescaped); + } + + web_client_api_request_v1(*host, &w, path_unescaped); + freez(path_unescaped); + + h2o_iovec_t body = buffer_to_h2o_iovec(w.response.data); + + // we move msg body to req->pool managed memory as it has to + // live until whole response has been encrypted and sent + // when req is finished memory will be freed with the pool + void *managed = h2o_mem_alloc_shared(&req->pool, body.len, NULL); + memcpy(managed, body.base, body.len); + body.base = managed; + + req->res.status = HTTP_RESP_OK; + req->res.reason = "OK"; + if (w.response.data->content_type == CT_APPLICATION_JSON) + h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_CONTENT_TYPE, NULL, CONTENT_JSON_UTF8); + else + h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_CONTENT_TYPE, NULL, CONTENT_TEXT_UTF8); + h2o_start_response(req, &generator); + h2o_send(req, &body, 1, H2O_SEND_STATE_FINAL); + + buffer_free(w.response.data); + buffer_free(w.response.header); + buffer_free(w.url_query_string_decoded); + + return 0; +} + +static int netdata_uberhandler(h2o_handler_t *self, h2o_req_t *req) +{ + UNUSED(self); + RRDHOST *host = localhost; + + int ret = _netdata_uberhandler(req, &host); + + char host_uuid_str[UUID_STR_LEN]; + uuid_unparse_lower(host->host_uuid, host_uuid_str); + + if (!ret) { + log_access("HTTPD OK method: " PRINTF_H2O_IOVEC_FMT + ", path: " PRINTF_H2O_IOVEC_FMT + ", as host: %s" + ", response: %d", + PRINTF_H2O_IOVEC(&req->method), + PRINTF_H2O_IOVEC(&req->input.path), + host == localhost ? "localhost" : host_uuid_str, + req->res.status); + } else { + log_access("HTTPD %d" + " method: " PRINTF_H2O_IOVEC_FMT + ", path: " PRINTF_H2O_IOVEC_FMT + ", forwarding to file handler as path: " PRINTF_H2O_IOVEC_FMT, + ret, + PRINTF_H2O_IOVEC(&req->method), + PRINTF_H2O_IOVEC(&req->input.path), + PRINTF_H2O_IOVEC(&req->path)); + } + + return ret; +} + +static int hdl_netdata_conf(h2o_handler_t *self, h2o_req_t *req) +{ + UNUSED(self); + if (!h2o_memis(req->method.base, req->method.len, H2O_STRLIT("GET"))) + return -1; + + BUFFER *buf = buffer_create(NBUF_INITIAL_SIZE_RESP, NULL); + config_generate(buf, 0); + + void *managed = h2o_mem_alloc_shared(&req->pool, buf->len, NULL); + memcpy(managed, buf->buffer, buf->len); + + req->res.status = HTTP_RESP_OK; + req->res.reason = "OK"; + h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_CONTENT_TYPE, NULL, CONTENT_TEXT_UTF8); + h2o_send_inline(req, managed, buf->len); + buffer_free(buf); + + return 0; +} + +#define POLL_INTERVAL 100 + +void *httpd_main(void *ptr) { + struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr; + + h2o_pathconf_t *pathconf; + h2o_hostconf_t *hostconf; + + netdata_thread_disable_cancelability(); + + const char *bind_addr = config_get(HTTPD_CONFIG_SECTION, "bind to", "127.0.0.1"); + int bind_port = config_get_number(HTTPD_CONFIG_SECTION, "port", 19998); + + h2o_config_init(&config); + hostconf = h2o_config_register_host(&config, h2o_iovec_init(H2O_STRLIT("default")), bind_port); + + pathconf = h2o_config_register_path(hostconf, "/netdata.conf", 0); + h2o_handler_t *handler = h2o_create_handler(pathconf, sizeof(*handler)); + handler->on_req = hdl_netdata_conf; + + pathconf = h2o_config_register_path(hostconf, "/", 0); + handler = h2o_create_handler(pathconf, sizeof(*handler)); + handler->on_req = netdata_uberhandler; + h2o_file_register(pathconf, netdata_configured_web_dir, NULL, NULL, H2O_FILE_FLAG_SEND_COMPRESSED); + + h2o_context_init(&ctx, h2o_evloop_create(), &config); + + if(ssl_init()) { + error_report("SSL was requested but could not be properly initialized. Aborting."); + return NULL; + } + + accept_ctx.ctx = &ctx; + accept_ctx.hosts = config.hosts; + + if (create_listener(bind_addr, bind_port) != 0) { + error("failed to create listener %s:%d", bind_addr, bind_port); + return NULL; + } + + while (service_running(SERVICE_HTTPD)) { + int rc = h2o_evloop_run(ctx.loop, POLL_INTERVAL); + if (rc < 0 && errno != EINTR) { + error("h2o_evloop_run returned (%d) with errno other than EINTR. Aborting", rc); + break; + } + } + + static_thread->enabled = NETDATA_MAIN_THREAD_EXITED; + return NULL; +} + +int httpd_is_enabled() { + return config_get_boolean(HTTPD_CONFIG_SECTION, "enabled", HTTPD_ENABLED_DEFAULT); +} |