Convert para_server to lopsub.
[paraslash.git] / http_send.c
1 /*
2 * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file http_send.c paraslash's http sender */
8
9 #include <netinet/in.h>
10 #include <sys/socket.h>
11 #include <regex.h>
12 #include <sys/types.h>
13 #include <arpa/inet.h>
14 #include <sys/un.h>
15 #include <netdb.h>
16 #include <lopsub.h>
17
18 #include "server.lsg.h"
19 #include "para.h"
20 #include "error.h"
21 #include "string.h"
22 #include "afh.h"
23 #include "server.h"
24 #include "http.h"
25 #include "list.h"
26 #include "send.h"
27 #include "sched.h"
28 #include "vss.h"
29 #include "close_on_fork.h"
30 #include "net.h"
31 #include "fd.h"
32 #include "chunk_queue.h"
33 #include "acl.h"
34
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"
37
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. */
41 HTTP_CONNECTED,
42 /** Successfully received the get request. */
43 HTTP_GOT_GET_REQUEST,
44 /** Connection is ready for sending audio data. */
45 HTTP_STREAMING,
46 /** We didn't receive a valid get request. */
47 HTTP_INVALID_GET_REQUEST
48 };
49
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;
54 };
55
56 static struct sender_status http_sender_status, *hss = &http_sender_status;
57
58 static int http_send_msg(struct sender_client *sc, const char *msg)
59 {
60 int ret = write_buffer(sc->fd, msg);
61
62 if (ret < 0)
63 shutdown_client(sc, hss);
64 return ret;
65 }
66
67 static void http_send_ok_msg(struct sender_client *sc)
68 {
69 PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
70 http_send_msg(sc, HTTP_OK_MSG);
71 }
72
73 static int http_send_err_msg(struct sender_client *sc)
74 {
75 PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
76 return http_send_msg(sc, HTTP_ERR_MSG);
77 }
78
79 static void http_shutdown_clients(void)
80 {
81 shutdown_clients(hss);
82 }
83
84 static int queue_chunk_or_shutdown(struct sender_client *sc,
85 struct sender_status *ss, const char *buf, size_t num_bytes)
86 {
87 int ret = cq_enqueue(sc->cq, buf, num_bytes);
88 if (ret < 0)
89 shutdown_client(sc, ss);
90 return ret;
91 }
92
93 /**
94 * Send one chunk of audio data to a connected client.
95 *
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.
103 *
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.
106 */
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)
110 {
111 int ret;
112
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);
116 if (ret < 0)
117 goto out;
118 }
119 }
120 sc->header_sent = 1;
121 ret = send_queued_chunks(sc->fd, sc->cq);
122 if (ret < 0) {
123 shutdown_client(sc, ss);
124 goto out;
125 }
126 if (!len)
127 goto out;
128 if (!ret) { /* still data left in the queue */
129 ret = queue_chunk_or_shutdown(sc, ss, buf, len);
130 goto out;
131 }
132 ret = xwrite(sc->fd, buf, len);
133 if (ret < 0) {
134 shutdown_client(sc, ss);
135 goto out;
136 }
137 if (ret != len)
138 ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
139 out:
140 if (ret < 0)
141 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
142 }
143
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)
147 {
148 struct sender_client *sc, *tmp;
149
150 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
151 struct private_http_sender_data *phsd = sc->private_data;
152
153 if (phsd->status == HTTP_STREAMING)
154 http_send_chunk(sc, hss, current_chunk, buf, len,
155 header_buf, header_len);
156 }
157 }
158
159 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
160 {
161 struct sender_client *sc, *tmp;
162 struct private_http_sender_data *phsd;
163 int ret;
164
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 */
169 break;
170 case HTTP_CONNECTED: /* need to recv get request */
171 ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
172 if (ret < 0)
173 phsd->status = HTTP_INVALID_GET_REQUEST;
174 else if (ret > 0) {
175 phsd->status = HTTP_GOT_GET_REQUEST;
176 PARA_INFO_LOG("received get request\n");
177 }
178 break;
179 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
180 phsd->status = HTTP_STREAMING;
181 http_send_ok_msg(sc);
182 break;
183 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
184 if (http_send_err_msg(sc) >= 0)
185 shutdown_client(sc, hss);
186 break;
187 }
188 }
189 sc = accept_sender_client(hss, rfds);
190 if (!sc)
191 return;
192 phsd = para_malloc(sizeof(*phsd));
193 sc->private_data = phsd;
194 phsd->status = HTTP_CONNECTED;
195 }
196
197 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
198 {
199 struct sender_client *sc, *tmp;
200
201 if (hss->listen_fd < 0)
202 return;
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);
211 }
212 }
213
214 static int http_com_on(__a_unused struct sender_command_data *scd)
215 {
216 return generic_com_on(hss, IPPROTO_TCP);
217 }
218
219 static int http_com_off(__a_unused struct sender_command_data *scd)
220 {
221 generic_com_off(hss);
222 return 1;
223 }
224
225 static int http_com_deny(struct sender_command_data *scd)
226 {
227 generic_com_deny(scd, hss);
228 return 1;
229 }
230
231 static int http_com_allow(struct sender_command_data *scd)
232 {
233 generic_com_allow(scd, hss);
234 return 1;
235 }
236
237 static char *http_status(void)
238 {
239 return generic_sender_status(hss, "http");
240 }
241
242 /**
243 * The init function of the http sender.
244 *
245 * \param s Pointer to the http sender struct.
246 *
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.
249 */
250 void http_send_init(struct sender *s)
251 {
252 int ret;
253 s->status = http_status;
254 s->send = http_send;
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;
266
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))
271 return;
272 ret = generic_com_on(hss, IPPROTO_TCP);
273 if (ret < 0)
274 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
275 }