src/web/server/h2o/http_server.c
// SPDX-License-Identifier: GPL-3.0-or-later
#include "daemon/common.h"
#include "streaming/common.h"
#include "http_server.h"
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
#pragma GCC diagnostic ignored "-Wtype-limits"
#include "h2o.h"
#include "h2o/http1.h"
#pragma GCC diagnostic pop
#include "streaming.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 API_V2_PREFIX "/api/v2/"
#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) {
if (fd != -1)
close(fd);
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
if (!accept_ctx.ssl_ctx) {
netdata_log_error("Could not allocate a new SSL_CTX");
return -1;
}
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) {
netdata_log_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) {
netdata_log_error("Could not load certificate from \"%s\"", cert_fn);
return -1;
}
h2o_ssl_register_alpn_protocols(accept_ctx.ssl_ctx, h2o_http2_alpn_protocols);
netdata_log_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)
*host = find_host_by_node_id(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--;
}
unsigned int api_version = 2;
size_t api_loc = h2o_strstr(norm_path.base, norm_path.len, H2O_STRLIT(API_V2_PREFIX));
if (api_loc == SIZE_MAX) {
api_version = 1;
api_loc = h2o_strstr(norm_path.base, norm_path.len, H2O_STRLIT(API_V1_PREFIX));
if (api_loc == SIZE_MAX)
return 1;
}
// API_V1_PREFIX and API_V2_PREFIX are the same length
// but I did this just in case someone changes the length of the prefix in future
// so he will not be shot in the leg here
// until then compiler will optimize this out
size_t api_len = api_version == 1 ? strlen(API_V1_PREFIX) : strlen(API_V2_PREFIX);
h2o_iovec_t api_command = norm_path;
api_command.base += api_loc + api_len;
api_command.len -= api_loc + api_len;
if (!api_command.len)
return 1;
// TODO - get a web_client from the cache
// 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;
memset(&w, 0, sizeof(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.url_as_received = buffer_create(NBUF_INITIAL_SIZE_RESP, NULL);
w.port_acl = HTTP_ACL_H2O | HTTP_ACL_ALL_FEATURES;
w.acl = w.port_acl; // TODO - web_client_update_acl_matches(w) to restrict this based on user configuration
char *path_c_str = iovec_to_cstr(&api_command);
char *path_unescaped = url_unescape(path_c_str);
buffer_strcat(w.url_as_received, iovec_to_cstr(&norm_path));
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);
}
//inline int web_client_api_request_v2(RRDHOST *host, struct web_client *w, char *url_path_endpoint) {
if (api_version == 2)
web_client_api_request_v2(*host, &w, path_unescaped);
else
web_client_api_request_v1(*host, &w, path_unescaped);
freez(path_unescaped);
// 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
h2o_iovec_t body;
{
BUFFER *wb = w.response.data;
body.base = wb->buffer;
body.len = wb->len;
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);
buffer_free(w.url_as_received);
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);
if (!ret) {
char host_uuid_str[UUID_STR_LEN];
if (host != NULL)
uuid_unparse_lower(host->host_uuid, host_uuid_str);
nd_log(NDLS_ACCESS, NDLP_DEBUG, "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 == NULL ? "unknown" : (localhost ? "localhost" : host_uuid_str),
req->res.status);
} else {
nd_log(NDLS_ACCESS, NDLP_DEBUG, "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;
}
static int hdl_stream(h2o_handler_t *self, h2o_req_t *req)
{
UNUSED(self);
netdata_log_info("Streaming request trough h2o received");
h2o_stream_conn_t *conn = mallocz(sizeof(*conn));
h2o_stream_conn_t_init(conn);
if (is_streaming_handshake(req)) {
h2o_stream_conn_t_destroy(conn);
freez(conn);
return 1;
}
/* build response */
req->res.status = HTTP_RESP_SWITCH_PROTO;
req->res.reason = "Switching Protocols";
h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_UPGRADE, NULL, H2O_STRLIT(NETDATA_STREAM_PROTO_NAME));
// TODO we should consider adding some nonce header here
// h2o_add_header_by_str(&req->pool, &req->res.headers, H2O_STRLIT("whatever reply"), 0, NULL, accept_key,
// strlen(accept_key));
h2o_http1_upgrade(req, NULL, 0, stream_on_complete, conn);
return 0;
}
#define POLL_INTERVAL 100
void *h2o_main(void *ptr) {
struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
h2o_pathconf_t *pathconf;
h2o_hostconf_t *hostconf;
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, NETDATA_STREAM_URL, 0);
handler = h2o_create_handler(pathconf, sizeof(*handler));
handler->on_req = hdl_stream;
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) {
netdata_log_error("failed to create listener %s:%d", bind_addr, bind_port);
return NULL;
}
usec_t last_wpoll = now_monotonic_usec();
while (service_running(SERVICE_HTTPD)) {
int rc = h2o_evloop_run(ctx.loop, POLL_INTERVAL);
if (rc < 0 && errno != EINTR) {
netdata_log_error("h2o_evloop_run returned (%d) with errno other than EINTR. Aborting", rc);
break;
}
usec_t now = now_monotonic_usec();
if (now - last_wpoll > POLL_INTERVAL * USEC_PER_MS) {
last_wpoll = now;
h2o_stream_check_pending_write_reqs();
}
}
static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
return NULL;
}
int httpd_is_enabled() {
return config_get_boolean(HTTPD_CONFIG_SECTION, "enabled", HTTPD_ENABLED_DEFAULT);
}