Merging upstream version 1.40.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 447 insertions, 0 deletions

diff --git a/httpd/h2o_utils.c b/httpd/h2o_utils.c
new file mode 100644
index 000000000..943216f59
--- /dev/null
+++ b/httpd/h2o_utils.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "h2o_utils.h"
+
+#include "h2o/string_.h"
+
+#include "libnetdata/libnetdata.h"
+
+char *iovec_to_cstr(h2o_iovec_t *str)
+{
+    char *c_str = mallocz(str->len + 1);
+    memcpy(c_str, str->base, str->len);
+    c_str[str->len] = 0;
+    return c_str;
+}
+
+#define KEY_VAL_BUFFER_GROWTH_STEP 5
+h2o_iovec_pair_vector_t *parse_URL_params(h2o_mem_pool_t *pool, h2o_iovec_t params_string)
+{
+    h2o_iovec_pair_vector_t *params_vec = h2o_mem_alloc_shared(pool, sizeof(h2o_iovec_pair_vector_t), NULL);
+    memset(params_vec, 0, sizeof(h2o_iovec_pair_vector_t));
+
+    h2o_iovec_pair_t param;
+    while ((param.name.base = (char*)h2o_next_token(&params_string, '&', &param.name.len, &param.value)) != NULL) {
+        if (params_vec->capacity == params_vec->size)
+            h2o_vector_reserve(pool, params_vec, params_vec->capacity + KEY_VAL_BUFFER_GROWTH_STEP);
+
+            params_vec->entries[params_vec->size++] = param;
+    }
+
+    return params_vec;
+}
+
+h2o_iovec_pair_t *get_URL_param_by_name(h2o_iovec_pair_vector_t *params_vec, const void *needle, size_t needle_len)
+{
+    for (size_t i = 0; i < params_vec->size; i++) {
+        h2o_iovec_pair_t *ret = &params_vec->entries[i];
+        if (h2o_memis(ret->name.base, ret->name.len, needle, needle_len))
+            return ret;
+    }
+    return NULL;
+}
+
+char *url_unescape(const char *url)
+{
+    char *result = mallocz(strlen(url) + 1);
+
+    int i, j;
+    for (i = 0, j = 0; url[i] != 0; i++, j++) {
+        if (url[i] == '%' && isxdigit(url[i+1]) && isxdigit(url[i+2])) {
+            char hex[3] = { url[i+1], url[i+2], 0 };
+            result[j] = strtol(hex, NULL, 16);
+            i += 2;
+        } else
+            result[j] = url[i];
+    }
+    result[j] = 0;
+
+    return result;
+}
diff --git a/httpd/h2o_utils.h b/httpd/h2o_utils.h
new file mode 100644
index 000000000..6760ed9a9
--- /dev/null
+++ b/httpd/h2o_utils.h
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_H2O_UTILS_H
+#define NETDATA_H2O_UTILS_H
+
+#include "h2o/memory.h"
+
+#define __HAS_URL_PARAMS(reqptr) ((reqptr)->query_at != SIZE_MAX && ((reqptr)->path.len - (reqptr)->query_at > 1))
+#define IF_HAS_URL_PARAMS(reqptr) if __HAS_URL_PARAMS(reqptr)
+#define UNLESS_HAS_URL_PARAMS(reqptr) if (!__HAS_URL_PARAMS(reqptr))
+#define URL_PARAMS_IOVEC_INIT(reqptr) { .base = &(reqptr)->path.base[(reqptr)->query_at + 1], \
+            .len = (reqptr)->path.len - (reqptr)->query_at - 1 }
+#define URL_PARAMS_IOVEC_INIT_WITH_QUESTIONMARK(reqptr) { .base = &(reqptr)->path.base[(reqptr)->query_at], \
+            .len = (reqptr)->path.len - (reqptr)->query_at }
+
+#define PRINTF_H2O_IOVEC_FMT "%.*s"
+#define PRINTF_H2O_IOVEC(iovec) ((int)(iovec)->len), ((iovec)->base)
+
+char *iovec_to_cstr(h2o_iovec_t *str);
+
+typedef struct h2o_iovec_pair {
+    h2o_iovec_t name;
+    h2o_iovec_t value;
+} h2o_iovec_pair_t;
+
+typedef H2O_VECTOR(h2o_iovec_pair_t) h2o_iovec_pair_vector_t;
+
+// Takes the part of url behind ? (the url encoded parameters)
+// and parse it to vector of name/value pairs without copying the actual strings
+h2o_iovec_pair_vector_t *parse_URL_params(h2o_mem_pool_t *pool, h2o_iovec_t params_string);
+
+// Searches for parameter by name (provided in needle)
+// returns pointer to it or NULL
+h2o_iovec_pair_t *get_URL_param_by_name(h2o_iovec_pair_vector_t *params_vec, const void *needle, size_t needle_len);
+
+char *url_unescape(const char *url);
+
+#endif /* NETDATA_H2O_UTILS_H */
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);
+}
diff --git a/httpd/http_server.h b/httpd/http_server.h
new file mode 100644
index 000000000..23b78da83
--- /dev/null
+++ b/httpd/http_server.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef HTTP_SERVER_H
+#define HTTP_SERVER_H
+
+void *httpd_main(void * ptr);
+
+int httpd_is_enabled();
+
+#endif /* HTTP_SERVER_H */