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/*
* 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_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);
}
void uh_request_done(struct client *cl)
{
uh_chunk_eof(cl);
uh_dispatch_done(cl);
cl->us->notify_write = NULL;
memset(&cl->dispatch, 0, sizeof(cl->dispatch));
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_http_header(cl, code, summary);
ustream_printf(cl->us, "Content-Type: text/html\r\n\r\n");
uh_chunk_printf(cl, "<h1>%s</h1>", summary);
if (fmt) {
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, NULL);
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++;
}
void uh_close_fds(void)
{
struct client *cl;
uloop_done();
uh_close_listen_fds();
list_for_each_entry(cl, &clients, list) {
close(cl->sfd.fd.fd);
if (cl->dispatch.close_fds)
cl->dispatch.close_fds(cl);
}
}
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