Merge branch 'refs/heads/t/para_play'
[paraslash.git] / http_send.c
1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
2
3 /** \file http_send.c paraslash's http sender */
4
5 #include <netinet/in.h>
6 #include <sys/socket.h>
7 #include <regex.h>
8 #include <sys/types.h>
9 #include <arpa/inet.h>
10 #include <sys/un.h>
11 #include <netdb.h>
12 #include <lopsub.h>
13
14 #include "server.lsg.h"
15 #include "para.h"
16 #include "error.h"
17 #include "string.h"
18 #include "afh.h"
19 #include "net.h"
20 #include "server.h"
21 #include "http.h"
22 #include "list.h"
23 #include "send.h"
24 #include "sched.h"
25 #include "vss.h"
26 #include "close_on_fork.h"
27 #include "fd.h"
28 #include "chunk_queue.h"
29
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"
32
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. */
36 HTTP_CONNECTED,
37 /** Successfully received the get request. */
38 HTTP_GOT_GET_REQUEST,
39 /** Connection is ready for sending audio data. */
40 HTTP_STREAMING,
41 /** We didn't receive a valid get request. */
42 HTTP_INVALID_GET_REQUEST
43 };
44
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;
49 };
50
51 static struct sender_status http_sender_status, *hss = &http_sender_status;
52
53 static int http_send_msg(struct sender_client *sc, const char *msg)
54 {
55 int ret = write_buffer(sc->fd, msg);
56
57 if (ret < 0)
58 shutdown_client(sc, hss);
59 return ret;
60 }
61
62 static void http_send_ok_msg(struct sender_client *sc)
63 {
64 PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
65 http_send_msg(sc, HTTP_OK_MSG);
66 }
67
68 static int http_send_err_msg(struct sender_client *sc)
69 {
70 PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
71 return http_send_msg(sc, HTTP_ERR_MSG);
72 }
73
74 static void http_shutdown_clients(void)
75 {
76 shutdown_clients(hss);
77 }
78
79 static void http_shutdown(void)
80 {
81 http_shutdown_clients();
82 generic_acl_deplete(&hss->acl);
83 free_sender_status(hss);
84 }
85
86 static int queue_chunk_or_shutdown(struct sender_client *sc,
87 struct sender_status *ss, const char *buf, size_t num_bytes)
88 {
89 int ret = cq_enqueue(sc->cq, buf, num_bytes);
90 if (ret < 0)
91 shutdown_client(sc, ss);
92 return ret;
93 }
94
95 /**
96 * Send one chunk of audio data to a connected client.
97 *
98 * \param sc The client.
99 * \param ss The sender.
100 * \param current_chunk The number of the chunk to write.
101 * \param buf The data to write.
102 * \param len The number of bytes of \a buf.
103 * \param header_buf The audio file header.
104 * \param header_len The number of bytes of \a header_buf.
105 *
106 * On errors, the client is shut down. If only a part of the buffer could be
107 * written, the remainder is put into the chunk queue for that client.
108 */
109 static void http_send_chunk(struct sender_client *sc, struct sender_status *ss,
110 long unsigned current_chunk, const char *buf, size_t len,
111 const char *header_buf, size_t header_len)
112 {
113 int ret;
114
115 if (!sc->header_sent && current_chunk) {
116 if (header_buf && header_len > 0) {
117 ret = queue_chunk_or_shutdown(sc, ss, header_buf, header_len);
118 if (ret < 0)
119 goto out;
120 }
121 }
122 sc->header_sent = 1;
123 ret = send_queued_chunks(sc->fd, sc->cq);
124 if (ret < 0) {
125 shutdown_client(sc, ss);
126 goto out;
127 }
128 if (!len)
129 goto out;
130 if (!ret) { /* still data left in the queue */
131 ret = queue_chunk_or_shutdown(sc, ss, buf, len);
132 goto out;
133 }
134 ret = xwrite(sc->fd, buf, len);
135 if (ret < 0) {
136 shutdown_client(sc, ss);
137 goto out;
138 }
139 if (ret != len)
140 ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
141 out:
142 if (ret < 0)
143 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
144 }
145
146 static void http_send(long unsigned current_chunk,
147 __a_unused long unsigned chunks_sent, const char *buf, size_t len,
148 const char *header_buf, size_t header_len)
149 {
150 struct sender_client *sc, *tmp;
151
152 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
153 struct private_http_sender_data *phsd = sc->private_data;
154
155 if (phsd->status == HTTP_STREAMING)
156 http_send_chunk(sc, hss, current_chunk, buf, len,
157 header_buf, header_len);
158 }
159 }
160
161 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
162 {
163 struct sender_client *sc, *tmp;
164 struct private_http_sender_data *phsd;
165 int ret;
166
167 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
168 phsd = sc->private_data;
169 switch (phsd->status) {
170 case HTTP_STREAMING: /* nothing to do */
171 break;
172 case HTTP_CONNECTED: /* need to recv get request */
173 ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
174 if (ret < 0)
175 phsd->status = HTTP_INVALID_GET_REQUEST;
176 else if (ret > 0) {
177 phsd->status = HTTP_GOT_GET_REQUEST;
178 PARA_INFO_LOG("received get request\n");
179 }
180 break;
181 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
182 phsd->status = HTTP_STREAMING;
183 http_send_ok_msg(sc);
184 break;
185 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
186 if (http_send_err_msg(sc) >= 0)
187 shutdown_client(sc, hss);
188 break;
189 }
190 }
191 sc = accept_sender_client(hss, rfds);
192 if (!sc)
193 return;
194 phsd = para_malloc(sizeof(*phsd));
195 sc->private_data = phsd;
196 phsd->status = HTTP_CONNECTED;
197 }
198
199 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
200 {
201 struct sender_client *sc, *tmp;
202 unsigned n;
203
204 FOR_EACH_LISTEN_FD(n, hss) {
205 if (hss->listen_fds[n] < 0)
206 continue;
207 para_fd_set(hss->listen_fds[n], rfds, max_fileno);
208 }
209 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
210 struct private_http_sender_data *phsd = sc->private_data;
211 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
212 para_fd_set(sc->fd, rfds, max_fileno);
213 if (phsd->status == HTTP_GOT_GET_REQUEST ||
214 phsd->status == HTTP_INVALID_GET_REQUEST)
215 para_fd_set(sc->fd, wfds, max_fileno);
216 }
217 }
218
219 static int http_com_on(__a_unused struct sender_command_data *scd)
220 {
221 generic_com_on(hss, IPPROTO_TCP);
222 return 1;
223 }
224
225 static int http_com_off(__a_unused struct sender_command_data *scd)
226 {
227 generic_com_off(hss);
228 return 1;
229 }
230
231 static int http_com_deny(struct sender_command_data *scd)
232 {
233 generic_com_deny(scd, hss);
234 return 1;
235 }
236
237 static int http_com_allow(struct sender_command_data *scd)
238 {
239 generic_com_allow(scd, hss);
240 return 1;
241 }
242
243 static char *http_status(void)
244 {
245 return generic_sender_status(hss, "http");
246 }
247
248 /*
249 * Initialize the client list and the access control list, and optionally
250 * listen on the tcp port.
251 */
252 static void http_send_init(void)
253 {
254 init_sender_status(hss, OPT_RESULT(HTTP_ACCESS),
255 OPT_RESULT(HTTP_LISTEN_ADDRESS),
256 OPT_UINT32_VAL(HTTP_PORT), OPT_UINT32_VAL(HTTP_MAX_CLIENTS),
257 OPT_GIVEN(HTTP_DEFAULT_DENY));
258 if (OPT_GIVEN(HTTP_NO_AUTOSTART))
259 return;
260 generic_com_on(hss, IPPROTO_TCP);
261 }
262
263 /**
264 * The HTTP sender.
265 *
266 * This is the only sender which does not FEC-encode the stream. This is not
267 * necessary because HTTP sits on top of TCP, a reliable transport which
268 * retransmits lost packets automatically. The sender employs per-client queues
269 * which queue chunks of audio data if they can not be sent immediately because
270 * the write operation would block. Most methods of the sender are implemented
271 * as wrappers for the generic functions defined in \ref send_common.c.
272 */
273 const struct sender http_sender = {
274 .name = "http",
275 .init = http_send_init,
276 .shutdown = http_shutdown,
277 .pre_select = http_pre_select,
278 .post_select = http_post_select,
279 .send = http_send,
280 .shutdown_clients = http_shutdown_clients,
281 .client_cmds = {
282 [SENDER_on] = http_com_on,
283 [SENDER_off] = http_com_off,
284 [SENDER_deny] = http_com_deny,
285 [SENDER_allow] = http_com_allow,
286 },
287 .help = generic_sender_help,
288 .status = http_status,
289 };