Initial implementation

1 files changed, 332 insertions, 0 deletions

diff --git a/client.c b/client.c
new file mode 100644
index 0000000..9e387c7
--- /dev/null
+++ b/client.c
@@ -0,0 +1,332 @@
+/*
+ * uhttpd - Tiny single-threaded httpd
+ *
+ *   Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
+ *   Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include <libubox/blobmsg.h>
+#include <ctype.h>
+
+#include "uhttpd.h"
+
+static LIST_HEAD(clients);
+
+int n_clients = 0;
+struct config conf = {};
+
+static const char *http_versions[] = {
+	[UH_HTTP_VER_0_9] = "HTTP/0.9",
+	[UH_HTTP_VER_1_0] = "HTTP/1.0",
+	[UH_HTTP_VER_1_1] = "HTTP/1.1",
+};
+
+void uh_http_header(struct client *cl, int code, const char *summary)
+{
+	const char *enc = "Transfer-Encoding: chunked\r\n";
+	const char *conn;
+
+	if (!uh_use_chunked(cl))
+		enc = "";
+
+	if (cl->request.version != UH_HTTP_VER_1_1)
+		conn = "Connection: close";
+	else
+		conn = "Connection: keep-alive";
+
+	ustream_printf(cl->us, "%s %03i %s\r\n%s\r\n%s",
+		http_versions[cl->request.version],
+		code, summary, conn, enc);
+}
+
+static void uh_client_error_header(struct client *cl, int code, const char *summary)
+{
+	uh_http_header(cl, code, summary);
+	ustream_printf(cl->us, "Content-Type: text/plain\r\n\r\n");
+}
+
+static void uh_connection_close(struct client *cl)
+{
+	cl->state = CLIENT_STATE_DONE;
+	cl->us->eof = true;
+	ustream_state_change(cl->us);
+}
+
+static void uh_dispatch_done(struct client *cl)
+{
+	if (cl->dispatch_free)
+		cl->dispatch_free(cl);
+	cl->dispatch_free = NULL;
+}
+
+void uh_request_done(struct client *cl)
+{
+	uh_chunk_eof(cl);
+	uh_dispatch_done(cl);
+	cl->us->notify_write = NULL;
+	memset(&cl->data, 0, sizeof(cl->data));
+
+	if (cl->request.version != UH_HTTP_VER_1_1 || !conf.http_keepalive) {
+		uh_connection_close(cl);
+		return;
+	}
+
+	cl->state = CLIENT_STATE_INIT;
+	uloop_timeout_set(&cl->timeout, conf.http_keepalive * 1000);
+}
+
+void __printf(4, 5)
+uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...)
+{
+	va_list arg;
+
+	uh_client_error_header(cl, code, summary);
+
+	va_start(arg, fmt);
+	uh_chunk_vprintf(cl, fmt, arg);
+	va_end(arg);
+
+	uh_request_done(cl);
+}
+
+static void uh_header_error(struct client *cl, int code, const char *summary)
+{
+	uh_client_error(cl, code, summary, "%s", summary);
+	uh_connection_close(cl);
+}
+
+static void client_timeout(struct uloop_timeout *timeout)
+{
+	struct client *cl = container_of(timeout, struct client, timeout);
+
+	cl->state = CLIENT_STATE_CLOSE;
+	uh_connection_close(cl);
+}
+
+static int client_parse_request(struct client *cl, char *data)
+{
+	struct http_request *req = &cl->request;
+	char *type, *path, *version;
+	int i;
+
+	type = strtok(data, " ");
+	path = strtok(NULL, " ");
+	version = strtok(NULL, " ");
+	if (!type || !path || !version)
+		return CLIENT_STATE_DONE;
+
+	req->url = path;
+	if (!strcmp(type, "GET"))
+		req->method = UH_HTTP_MSG_GET;
+	else if (!strcmp(type, "POST"))
+		req->method = UH_HTTP_MSG_POST;
+	else if (!strcmp(type, "HEAD"))
+		req->method = UH_HTTP_MSG_HEAD;
+	else
+		return CLIENT_STATE_DONE;
+
+	cl->request.version = -1;
+	i = array_size(http_versions);
+	while (i--) {
+		if (!strcmp(version, http_versions[i])) {
+			cl->request.version = i;
+			break;
+		}
+	}
+	if (cl->request.version < 0)
+		return CLIENT_STATE_DONE;
+
+	return CLIENT_STATE_HEADER;
+}
+
+static bool client_init_cb(struct client *cl, char *buf, int len)
+{
+	char *newline;
+
+	newline = strstr(buf, "\r\n");
+	if (!newline)
+		return false;
+
+	*newline = 0;
+	blob_buf_init(&cl->hdr, 0);
+	blobmsg_add_string(&cl->hdr, "REQUEST", buf);
+	ustream_consume(cl->us, newline + 2 - buf);
+	cl->state = client_parse_request(cl, (char *) blobmsg_data(blob_data(cl->hdr.head)));
+	if (cl->state == CLIENT_STATE_DONE)
+		uh_header_error(cl, 400, "Bad Request");
+
+	return true;
+}
+
+static void client_header_complete(struct client *cl)
+{
+	uh_handle_file_request(cl);
+}
+
+static int client_parse_header(struct client *cl, char *data)
+{
+	char *name;
+	char *val;
+
+	if (!*data) {
+		uloop_timeout_cancel(&cl->timeout);
+		client_header_complete(cl);
+		return CLIENT_STATE_DATA;
+	}
+
+	val = strchr(data, ':');
+	if (!val)
+		return CLIENT_STATE_DONE;
+
+	*val = 0;
+	val++;
+
+	while (isspace(*val))
+		val++;
+
+	for (name = data; *name; name++)
+		if (isupper(*name))
+			*name = tolower(*name);
+
+	blobmsg_add_string(&cl->hdr, data, val);
+
+	return CLIENT_STATE_HEADER;
+}
+
+static bool client_data_cb(struct client *cl, char *buf, int len)
+{
+	return false;
+}
+
+static bool client_header_cb(struct client *cl, char *buf, int len)
+{
+	char *newline;
+	int line_len;
+
+	newline = strstr(buf, "\r\n");
+	if (!newline)
+		return false;
+
+	*newline = 0;
+	cl->state = client_parse_header(cl, buf);
+	line_len = newline + 2 - buf;
+	ustream_consume(cl->us, line_len);
+	if (cl->state == CLIENT_STATE_DATA)
+		client_data_cb(cl, newline + 2, len - line_len);
+
+	return true;
+}
+
+typedef bool (*read_cb_t)(struct client *cl, char *buf, int len);
+static read_cb_t read_cbs[] = {
+	[CLIENT_STATE_INIT] = client_init_cb,
+	[CLIENT_STATE_HEADER] = client_header_cb,
+	[CLIENT_STATE_DATA] = client_data_cb,
+};
+
+static void client_read_cb(struct client *cl)
+{
+	struct ustream *us = cl->us;
+	char *str;
+	int len;
+
+	do {
+		str = ustream_get_read_buf(us, &len);
+		if (!str)
+			break;
+
+		if (cl->state >= array_size(read_cbs) || !read_cbs[cl->state])
+			break;
+
+		if (!read_cbs[cl->state](cl, str, len)) {
+			if (len == us->r.buffer_len)
+				uh_header_error(cl, 413, "Request Entity Too Large");
+			break;
+		}
+	} while(1);
+}
+
+static void client_close(struct client *cl)
+{
+	uh_dispatch_done(cl);
+	uloop_timeout_cancel(&cl->timeout);
+	ustream_free(&cl->sfd.stream);
+	close(cl->sfd.fd.fd);
+	list_del(&cl->list);
+	free(cl);
+
+	uh_unblock_listeners();
+}
+
+static void client_ustream_read_cb(struct ustream *s, int bytes)
+{
+	struct client *cl = container_of(s, struct client, sfd);
+
+	client_read_cb(cl);
+}
+
+static void client_ustream_write_cb(struct ustream *s, int bytes)
+{
+	struct client *cl = container_of(s, struct client, sfd);
+
+	if (cl->dispatch_write_cb)
+		cl->dispatch_write_cb(cl);
+}
+
+static void client_notify_state(struct ustream *s)
+{
+	struct client *cl = container_of(s, struct client, sfd);
+
+	if (cl->state == CLIENT_STATE_CLOSE ||
+		(s->eof && !s->w.data_bytes) || s->write_error)
+		return client_close(cl);
+}
+
+void uh_accept_client(int fd)
+{
+	static struct client *next_client;
+	struct client *cl;
+	unsigned int sl;
+	int sfd;
+	static int client_id = 0;
+
+	if (!next_client)
+		next_client = calloc(1, sizeof(*next_client));
+
+	cl = next_client;
+
+	sl = sizeof(cl->peeraddr);
+	sfd = accept(fd, (struct sockaddr *) &cl->peeraddr, &sl);
+	if (sfd < 0)
+		return;
+
+	sl = sizeof(cl->servaddr);
+	getsockname(fd, (struct sockaddr *) &cl->servaddr, &sl);
+	cl->us = &cl->sfd.stream;
+	cl->us->string_data = true;
+	cl->us->notify_read = client_ustream_read_cb;
+	cl->us->notify_write = client_ustream_write_cb;
+	cl->us->notify_state = client_notify_state;
+	ustream_fd_init(&cl->sfd, sfd);
+
+	cl->timeout.cb = client_timeout;
+	uloop_timeout_set(&cl->timeout, conf.network_timeout * 1000);
+
+	list_add_tail(&cl->list, &clients);
+
+	next_client = NULL;
+	n_clients++;
+	cl->id = client_id++;
+}