1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file http_send.c paraslash's http sender */
5 #include <netinet/in.h>
6 #include <sys/socket.h>
14 #include "server.lsg.h"
26 #include "close_on_fork.h"
28 #include "chunk_queue.h"
30 /** Message sent to clients that do not send a valid get request. */
31 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
33 /** The possible states of a client from the server's POV. */
34 enum http_client_status {
35 /** We accepted the connection on the tcp socket. */
37 /** Successfully received the get request. */
39 /** Connection is ready for sending audio data. */
41 /** We didn't receive a valid get request. */
42 HTTP_INVALID_GET_REQUEST
45 /** For each connected client, a structure of this type is maintained. */
46 struct private_http_sender_data {
47 /** The current state of this client. */
48 enum http_client_status status;
51 static struct sender_status http_sender_status, *hss = &http_sender_status;
53 static int http_send_msg(struct sender_client *sc, const char *msg)
55 int ret = write_buffer(sc->fd, msg);
58 shutdown_client(sc, hss);
62 static void http_send_ok_msg(struct sender_client *sc)
64 PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
65 http_send_msg(sc, HTTP_OK_MSG);
68 static int http_send_err_msg(struct sender_client *sc)
70 PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
71 return http_send_msg(sc, HTTP_ERR_MSG);
74 static void http_shutdown_clients(void)
76 shutdown_clients(hss);
79 static void http_shutdown(void)
81 http_shutdown_clients();
82 generic_acl_deplete(&hss->acl);
85 static int queue_chunk_or_shutdown(struct sender_client *sc,
86 struct sender_status *ss, const char *buf, size_t num_bytes)
88 int ret = cq_enqueue(sc->cq, buf, num_bytes);
90 shutdown_client(sc, ss);
95 * Send one chunk of audio data to a connected client.
97 * \param sc The client.
98 * \param ss The sender.
99 * \param current_chunk The number of the chunk to write.
100 * \param buf The data to write.
101 * \param len The number of bytes of \a buf.
102 * \param header_buf The audio file header.
103 * \param header_len The number of bytes of \a header_buf.
105 * On errors, the client is shut down. If only a part of the buffer could be
106 * written, the remainder is put into the chunk queue for that client.
108 static void http_send_chunk(struct sender_client *sc, struct sender_status *ss,
109 long unsigned current_chunk, const char *buf, size_t len,
110 const char *header_buf, size_t header_len)
114 if (!sc->header_sent && current_chunk) {
115 if (header_buf && header_len > 0) {
116 ret = queue_chunk_or_shutdown(sc, ss, header_buf, header_len);
122 ret = send_queued_chunks(sc->fd, sc->cq);
124 shutdown_client(sc, ss);
129 if (!ret) { /* still data left in the queue */
130 ret = queue_chunk_or_shutdown(sc, ss, buf, len);
133 ret = xwrite(sc->fd, buf, len);
135 shutdown_client(sc, ss);
139 ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
142 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
145 static void http_send(long unsigned current_chunk,
146 __a_unused long unsigned chunks_sent, const char *buf, size_t len,
147 const char *header_buf, size_t header_len)
149 struct sender_client *sc, *tmp;
151 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
152 struct private_http_sender_data *phsd = sc->private_data;
154 if (phsd->status == HTTP_STREAMING)
155 http_send_chunk(sc, hss, current_chunk, buf, len,
156 header_buf, header_len);
160 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
162 struct sender_client *sc, *tmp;
163 struct private_http_sender_data *phsd;
166 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
167 phsd = sc->private_data;
168 switch (phsd->status) {
169 case HTTP_STREAMING: /* nothing to do */
171 case HTTP_CONNECTED: /* need to recv get request */
172 ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
174 phsd->status = HTTP_INVALID_GET_REQUEST;
176 phsd->status = HTTP_GOT_GET_REQUEST;
177 PARA_INFO_LOG("received get request\n");
180 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
181 phsd->status = HTTP_STREAMING;
182 http_send_ok_msg(sc);
184 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
185 if (http_send_err_msg(sc) >= 0)
186 shutdown_client(sc, hss);
190 sc = accept_sender_client(hss, rfds);
193 phsd = para_malloc(sizeof(*phsd));
194 sc->private_data = phsd;
195 phsd->status = HTTP_CONNECTED;
198 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
200 struct sender_client *sc, *tmp;
203 FOR_EACH_LISTEN_FD(n, hss) {
204 if (hss->listen_fds[n] < 0)
206 para_fd_set(hss->listen_fds[n], rfds, max_fileno);
208 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
209 struct private_http_sender_data *phsd = sc->private_data;
210 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
211 para_fd_set(sc->fd, rfds, max_fileno);
212 if (phsd->status == HTTP_GOT_GET_REQUEST ||
213 phsd->status == HTTP_INVALID_GET_REQUEST)
214 para_fd_set(sc->fd, wfds, max_fileno);
218 static int http_com_on(__a_unused struct sender_command_data *scd)
220 generic_com_on(hss, IPPROTO_TCP);
224 static int http_com_off(__a_unused struct sender_command_data *scd)
226 generic_com_off(hss);
230 static int http_com_deny(struct sender_command_data *scd)
232 generic_com_deny(scd, hss);
236 static int http_com_allow(struct sender_command_data *scd)
238 generic_com_allow(scd, hss);
242 static char *http_status(void)
244 return generic_sender_status(hss, "http");
248 * Initialize the client list and the access control list, and optionally
249 * listen on the tcp port.
251 static void http_send_init(void)
253 init_sender_status(hss, OPT_RESULT(HTTP_ACCESS),
254 OPT_RESULT(HTTP_LISTEN_ADDRESS),
255 OPT_UINT32_VAL(HTTP_PORT), OPT_UINT32_VAL(HTTP_MAX_CLIENTS),
256 OPT_GIVEN(HTTP_DEFAULT_DENY));
257 if (OPT_GIVEN(HTTP_NO_AUTOSTART))
259 generic_com_on(hss, IPPROTO_TCP);
265 * This is the only sender which does not FEC-encode the stream. This is not
266 * necessary because HTTP sits on top of TCP, a reliable transport which
267 * retransmits lost packets automatically. The sender employs per-client queues
268 * which queue chunks of audio data if they can not be sent immediately because
269 * the write operation would block. Most methods of the sender are implemented
270 * as wrappers for the generic functions defined in \ref send_common.c.
272 const struct sender http_sender = {
274 .init = http_send_init,
275 .shutdown = http_shutdown,
276 .pre_select = http_pre_select,
277 .post_select = http_post_select,
279 .shutdown_clients = http_shutdown_clients,
281 [SENDER_on] = http_com_on,
282 [SENDER_off] = http_com_off,
283 [SENDER_deny] = http_com_deny,
284 [SENDER_allow] = http_com_allow,
286 .help = generic_sender_help,
287 .status = http_status,