build: Remove two unused variables from Makefile.in.
[paraslash.git] / http_send.c
1 /*
2 * Copyright (C) 2005-2013 Andre Noll <maan@systemlinux.org>
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 <regex.h>
10 #include <sys/types.h>
11 #include <osl.h>
12
13 #include "para.h"
14 #include "error.h"
15 #include "string.h"
16 #include "server.cmdline.h"
17 #include "afh.h"
18 #include "afs.h"
19 #include "server.h"
20 #include "http.h"
21 #include "list.h"
22 #include "send.h"
23 #include "sched.h"
24 #include "vss.h"
25 #include "close_on_fork.h"
26 #include "net.h"
27 #include "fd.h"
28 #include "chunk_queue.h"
29 #include "acl.h"
30
31 /** Message sent to clients that do not send a valid get request. */
32 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
33
34 /** The possible states of a client from the server's POV. */
35 enum http_client_status {
36 /** We accepted the connection on the tcp socket. */
37 HTTP_CONNECTED,
38 /** Successfully received the get request. */
39 HTTP_GOT_GET_REQUEST,
40 /** Connection is ready for sending audio data. */
41 HTTP_STREAMING,
42 /** We didn't receive a valid get request. */
43 HTTP_INVALID_GET_REQUEST
44 };
45
46 /** For each connected client, a structure of this type is maintained. */
47 struct private_http_sender_data {
48 /** The current state of this client. */
49 enum http_client_status status;
50 };
51
52 static struct sender_status http_sender_status, *hss = &http_sender_status;
53
54 static int http_send_msg(struct sender_client *sc, const char *msg)
55 {
56 int ret = write_buffer(sc->fd, msg);
57
58 if (ret < 0)
59 shutdown_client(sc, hss);
60 return ret;
61 }
62
63 static void http_send_ok_msg(struct sender_client *sc)
64 {
65 PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
66 http_send_msg(sc, HTTP_OK_MSG);
67 }
68
69 static int http_send_err_msg(struct sender_client *sc)
70 {
71 PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
72 return http_send_msg(sc, HTTP_ERR_MSG);
73 }
74
75 static void http_shutdown_clients(void)
76 {
77 shutdown_clients(hss);
78 }
79
80 static int queue_chunk_or_shutdown(struct sender_client *sc,
81 struct sender_status *ss, const char *buf, size_t num_bytes)
82 {
83 int ret = cq_enqueue(sc->cq, buf, num_bytes);
84 if (ret < 0)
85 shutdown_client(sc, ss);
86 return ret;
87 }
88
89 /**
90 * Send one chunk of audio data to a connected client.
91 *
92 * \param sc The client.
93 * \param ss The sender.
94 * \param current_chunk The number of the chunk to write.
95 * \param buf The data to write.
96 * \param len The number of bytes of \a buf.
97 * \param header_buf The audio file header.
98 * \param header_len The number of bytes of \a header_buf.
99 *
100 * On errors, the client is shut down. If only a part of the buffer could be
101 * written, the remainder is put into the chunk queue for that client.
102 */
103 static void http_send_chunk(struct sender_client *sc, struct sender_status *ss,
104 long unsigned current_chunk, const char *buf, size_t len,
105 const char *header_buf, size_t header_len)
106 {
107 int ret;
108
109 if (!sc->header_sent && current_chunk) {
110 if (header_buf && header_len > 0) {
111 ret = queue_chunk_or_shutdown(sc, ss, header_buf, header_len);
112 if (ret < 0)
113 goto out;
114 }
115 }
116 sc->header_sent = 1;
117 ret = send_queued_chunks(sc->fd, sc->cq);
118 if (ret < 0) {
119 shutdown_client(sc, ss);
120 goto out;
121 }
122 if (!len)
123 goto out;
124 if (!ret) { /* still data left in the queue */
125 ret = queue_chunk_or_shutdown(sc, ss, buf, len);
126 goto out;
127 }
128 ret = xwrite(sc->fd, buf, len);
129 if (ret < 0) {
130 shutdown_client(sc, ss);
131 goto out;
132 }
133 if (ret != len)
134 ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
135 out:
136 if (ret < 0)
137 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
138 }
139
140 static void http_send(long unsigned current_chunk,
141 __a_unused long unsigned chunks_sent, const char *buf, size_t len,
142 const char *header_buf, size_t header_len)
143 {
144 struct sender_client *sc, *tmp;
145
146 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
147 struct private_http_sender_data *phsd = sc->private_data;
148
149 if (phsd->status == HTTP_STREAMING)
150 http_send_chunk(sc, hss, current_chunk, buf, len,
151 header_buf, header_len);
152 }
153 }
154
155 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
156 {
157 struct sender_client *sc, *tmp;
158 struct private_http_sender_data *phsd;
159 int ret;
160
161 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
162 phsd = sc->private_data;
163 switch (phsd->status) {
164 case HTTP_STREAMING: /* nothing to do */
165 break;
166 case HTTP_CONNECTED: /* need to recv get request */
167 ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
168 if (ret < 0)
169 phsd->status = HTTP_INVALID_GET_REQUEST;
170 else if (ret > 0) {
171 phsd->status = HTTP_GOT_GET_REQUEST;
172 PARA_INFO_LOG("received get request\n");
173 }
174 break;
175 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
176 phsd->status = HTTP_STREAMING;
177 http_send_ok_msg(sc);
178 break;
179 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
180 if (http_send_err_msg(sc) >= 0)
181 shutdown_client(sc, hss);
182 break;
183 }
184 }
185 sc = accept_sender_client(hss, rfds);
186 if (!sc)
187 return;
188 phsd = para_malloc(sizeof(*phsd));
189 sc->private_data = phsd;
190 phsd->status = HTTP_CONNECTED;
191 }
192
193 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
194 {
195 struct sender_client *sc, *tmp;
196
197 if (hss->listen_fd < 0)
198 return;
199 para_fd_set(hss->listen_fd, rfds, max_fileno);
200 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
201 struct private_http_sender_data *phsd = sc->private_data;
202 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
203 para_fd_set(sc->fd, rfds, max_fileno);
204 if (phsd->status == HTTP_GOT_GET_REQUEST ||
205 phsd->status == HTTP_INVALID_GET_REQUEST)
206 para_fd_set(sc->fd, wfds, max_fileno);
207 }
208 }
209
210 static int http_com_on(__a_unused struct sender_command_data *scd)
211 {
212 return generic_com_on(hss, IPPROTO_TCP);
213 }
214
215 static int http_com_off(__a_unused struct sender_command_data *scd)
216 {
217 generic_com_off(hss);
218 return 1;
219 }
220
221 static int http_com_deny(struct sender_command_data *scd)
222 {
223 generic_com_deny(scd, hss);
224 return 1;
225 }
226
227 static int http_com_allow(struct sender_command_data *scd)
228 {
229 generic_com_allow(scd, hss);
230 return 1;
231 }
232
233 static char *http_info(void)
234 {
235 return get_sender_info(hss, "http");
236 }
237
238 /**
239 * The init function of the http sender.
240 *
241 * \param s Pointer to the http sender struct.
242 *
243 * It initializes all function pointers of \a s, the client list and the access
244 * control list. If the autostart option was given, the tcp port is opened.
245 */
246 void http_send_init(struct sender *s)
247 {
248 int ret;
249 s->info = http_info;
250 s->send = http_send;
251 s->pre_select = http_pre_select;
252 s->post_select = http_post_select;
253 s->shutdown_clients = http_shutdown_clients;
254 s->resolve_target = NULL;
255 s->help = generic_sender_help;
256 s->client_cmds[SENDER_ON] = http_com_on;
257 s->client_cmds[SENDER_OFF] = http_com_off;
258 s->client_cmds[SENDER_DENY] = http_com_deny;
259 s->client_cmds[SENDER_ALLOW] = http_com_allow;
260 s->client_cmds[SENDER_ADD] = NULL;
261 s->client_cmds[SENDER_DELETE] = NULL;
262
263 init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
264 conf.http_port_arg, conf.http_max_clients_arg,
265 conf.http_default_deny_given);
266 if (conf.http_no_autostart_given)
267 return;
268 ret = generic_com_on(hss, IPPROTO_TCP);
269 if (ret < 0)
270 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
271 }