2 * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file http_send.c paraslash's http sender */
9 #include <netinet/in.h>
10 #include <sys/socket.h>
12 #include <sys/types.h>
13 #include <arpa/inet.h>
18 #include "server.lsg.h"
29 #include "close_on_fork.h"
32 #include "chunk_queue.h"
35 /** Message sent to clients that do not send a valid get request. */
36 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
38 /** The possible states of a client from the server's POV. */
39 enum http_client_status {
40 /** We accepted the connection on the tcp socket. */
42 /** Successfully received the get request. */
44 /** Connection is ready for sending audio data. */
46 /** We didn't receive a valid get request. */
47 HTTP_INVALID_GET_REQUEST
50 /** For each connected client, a structure of this type is maintained. */
51 struct private_http_sender_data {
52 /** The current state of this client. */
53 enum http_client_status status;
56 static struct sender_status http_sender_status, *hss = &http_sender_status;
58 static int http_send_msg(struct sender_client *sc, const char *msg)
60 int ret = write_buffer(sc->fd, msg);
63 shutdown_client(sc, hss);
67 static void http_send_ok_msg(struct sender_client *sc)
69 PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
70 http_send_msg(sc, HTTP_OK_MSG);
73 static int http_send_err_msg(struct sender_client *sc)
75 PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
76 return http_send_msg(sc, HTTP_ERR_MSG);
79 static void http_shutdown_clients(void)
81 shutdown_clients(hss);
84 static int queue_chunk_or_shutdown(struct sender_client *sc,
85 struct sender_status *ss, const char *buf, size_t num_bytes)
87 int ret = cq_enqueue(sc->cq, buf, num_bytes);
89 shutdown_client(sc, ss);
94 * Send one chunk of audio data to a connected client.
96 * \param sc The client.
97 * \param ss The sender.
98 * \param current_chunk The number of the chunk to write.
99 * \param buf The data to write.
100 * \param len The number of bytes of \a buf.
101 * \param header_buf The audio file header.
102 * \param header_len The number of bytes of \a header_buf.
104 * On errors, the client is shut down. If only a part of the buffer could be
105 * written, the remainder is put into the chunk queue for that client.
107 static void http_send_chunk(struct sender_client *sc, struct sender_status *ss,
108 long unsigned current_chunk, const char *buf, size_t len,
109 const char *header_buf, size_t header_len)
113 if (!sc->header_sent && current_chunk) {
114 if (header_buf && header_len > 0) {
115 ret = queue_chunk_or_shutdown(sc, ss, header_buf, header_len);
121 ret = send_queued_chunks(sc->fd, sc->cq);
123 shutdown_client(sc, ss);
128 if (!ret) { /* still data left in the queue */
129 ret = queue_chunk_or_shutdown(sc, ss, buf, len);
132 ret = xwrite(sc->fd, buf, len);
134 shutdown_client(sc, ss);
138 ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
141 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
144 static void http_send(long unsigned current_chunk,
145 __a_unused long unsigned chunks_sent, const char *buf, size_t len,
146 const char *header_buf, size_t header_len)
148 struct sender_client *sc, *tmp;
150 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
151 struct private_http_sender_data *phsd = sc->private_data;
153 if (phsd->status == HTTP_STREAMING)
154 http_send_chunk(sc, hss, current_chunk, buf, len,
155 header_buf, header_len);
159 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
161 struct sender_client *sc, *tmp;
162 struct private_http_sender_data *phsd;
165 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
166 phsd = sc->private_data;
167 switch (phsd->status) {
168 case HTTP_STREAMING: /* nothing to do */
170 case HTTP_CONNECTED: /* need to recv get request */
171 ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
173 phsd->status = HTTP_INVALID_GET_REQUEST;
175 phsd->status = HTTP_GOT_GET_REQUEST;
176 PARA_INFO_LOG("received get request\n");
179 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
180 phsd->status = HTTP_STREAMING;
181 http_send_ok_msg(sc);
183 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
184 if (http_send_err_msg(sc) >= 0)
185 shutdown_client(sc, hss);
189 sc = accept_sender_client(hss, rfds);
192 phsd = para_malloc(sizeof(*phsd));
193 sc->private_data = phsd;
194 phsd->status = HTTP_CONNECTED;
197 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
199 struct sender_client *sc, *tmp;
201 if (hss->listen_fd < 0)
203 para_fd_set(hss->listen_fd, rfds, max_fileno);
204 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
205 struct private_http_sender_data *phsd = sc->private_data;
206 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
207 para_fd_set(sc->fd, rfds, max_fileno);
208 if (phsd->status == HTTP_GOT_GET_REQUEST ||
209 phsd->status == HTTP_INVALID_GET_REQUEST)
210 para_fd_set(sc->fd, wfds, max_fileno);
214 static int http_com_on(__a_unused struct sender_command_data *scd)
216 return generic_com_on(hss, IPPROTO_TCP);
219 static int http_com_off(__a_unused struct sender_command_data *scd)
221 generic_com_off(hss);
225 static int http_com_deny(struct sender_command_data *scd)
227 generic_com_deny(scd, hss);
231 static int http_com_allow(struct sender_command_data *scd)
233 generic_com_allow(scd, hss);
237 static char *http_status(void)
239 return generic_sender_status(hss, "http");
243 * The init function of the http sender.
245 * \param s Pointer to the http sender struct.
247 * It initializes all function pointers of \a s, the client list and the access
248 * control list. If the autostart option was given, the tcp port is opened.
250 void http_send_init(struct sender *s)
253 s->status = http_status;
255 s->pre_select = http_pre_select;
256 s->post_select = http_post_select;
257 s->shutdown_clients = http_shutdown_clients;
258 s->resolve_target = NULL;
259 s->help = generic_sender_help;
260 s->client_cmds[SENDER_on] = http_com_on;
261 s->client_cmds[SENDER_off] = http_com_off;
262 s->client_cmds[SENDER_deny] = http_com_deny;
263 s->client_cmds[SENDER_allow] = http_com_allow;
264 s->client_cmds[SENDER_add] = NULL;
265 s->client_cmds[SENDER_delete] = NULL;
267 init_sender_status(hss, OPT_RESULT(HTTP_ACCESS),
268 OPT_UINT32_VAL(HTTP_PORT), OPT_UINT32_VAL(HTTP_MAX_CLIENTS),
269 OPT_GIVEN(HTTP_DEFAULT_DENY));
270 if (OPT_GIVEN(HTTP_NO_AUTOSTART))
272 ret = generic_com_on(hss, IPPROTO_TCP);
274 PARA_ERROR_LOG("%s\n", para_strerror(-ret));