aft.c: Prefer localtime() over localtime_r().
[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
17 #include "para.h"
18 #include "error.h"
19 #include "string.h"
20 #include "server.cmdline.h"
21 #include "afh.h"
22 #include "server.h"
23 #include "http.h"
24 #include "list.h"
25 #include "send.h"
26 #include "sched.h"
27 #include "vss.h"
28 #include "close_on_fork.h"
29 #include "net.h"
30 #include "fd.h"
31 #include "chunk_queue.h"
32 #include "acl.h"
33
34 /** Message sent to clients that do not send a valid get request. */
35 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
36
37 /** The possible states of a client from the server's POV. */
38 enum http_client_status {
39 /** We accepted the connection on the tcp socket. */
40 HTTP_CONNECTED,
41 /** Successfully received the get request. */
42 HTTP_GOT_GET_REQUEST,
43 /** Connection is ready for sending audio data. */
44 HTTP_STREAMING,
45 /** We didn't receive a valid get request. */
46 HTTP_INVALID_GET_REQUEST
47 };
48
49 /** For each connected client, a structure of this type is maintained. */
50 struct private_http_sender_data {
51 /** The current state of this client. */
52 enum http_client_status status;
53 };
54
55 static struct sender_status http_sender_status, *hss = &http_sender_status;
56
57 static int http_send_msg(struct sender_client *sc, const char *msg)
58 {
59 int ret = write_buffer(sc->fd, msg);
60
61 if (ret < 0)
62 shutdown_client(sc, hss);
63 return ret;
64 }
65
66 static void http_send_ok_msg(struct sender_client *sc)
67 {
68 PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
69 http_send_msg(sc, HTTP_OK_MSG);
70 }
71
72 static int http_send_err_msg(struct sender_client *sc)
73 {
74 PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
75 return http_send_msg(sc, HTTP_ERR_MSG);
76 }
77
78 static void http_shutdown_clients(void)
79 {
80 shutdown_clients(hss);
81 }
82
83 static int queue_chunk_or_shutdown(struct sender_client *sc,
84 struct sender_status *ss, const char *buf, size_t num_bytes)
85 {
86 int ret = cq_enqueue(sc->cq, buf, num_bytes);
87 if (ret < 0)
88 shutdown_client(sc, ss);
89 return ret;
90 }
91
92 /**
93 * Send one chunk of audio data to a connected client.
94 *
95 * \param sc The client.
96 * \param ss The sender.
97 * \param current_chunk The number of the chunk to write.
98 * \param buf The data to write.
99 * \param len The number of bytes of \a buf.
100 * \param header_buf The audio file header.
101 * \param header_len The number of bytes of \a header_buf.
102 *
103 * On errors, the client is shut down. If only a part of the buffer could be
104 * written, the remainder is put into the chunk queue for that client.
105 */
106 static void http_send_chunk(struct sender_client *sc, struct sender_status *ss,
107 long unsigned current_chunk, const char *buf, size_t len,
108 const char *header_buf, size_t header_len)
109 {
110 int ret;
111
112 if (!sc->header_sent && current_chunk) {
113 if (header_buf && header_len > 0) {
114 ret = queue_chunk_or_shutdown(sc, ss, header_buf, header_len);
115 if (ret < 0)
116 goto out;
117 }
118 }
119 sc->header_sent = 1;
120 ret = send_queued_chunks(sc->fd, sc->cq);
121 if (ret < 0) {
122 shutdown_client(sc, ss);
123 goto out;
124 }
125 if (!len)
126 goto out;
127 if (!ret) { /* still data left in the queue */
128 ret = queue_chunk_or_shutdown(sc, ss, buf, len);
129 goto out;
130 }
131 ret = xwrite(sc->fd, buf, len);
132 if (ret < 0) {
133 shutdown_client(sc, ss);
134 goto out;
135 }
136 if (ret != len)
137 ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
138 out:
139 if (ret < 0)
140 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
141 }
142
143 static void http_send(long unsigned current_chunk,
144 __a_unused long unsigned chunks_sent, const char *buf, size_t len,
145 const char *header_buf, size_t header_len)
146 {
147 struct sender_client *sc, *tmp;
148
149 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
150 struct private_http_sender_data *phsd = sc->private_data;
151
152 if (phsd->status == HTTP_STREAMING)
153 http_send_chunk(sc, hss, current_chunk, buf, len,
154 header_buf, header_len);
155 }
156 }
157
158 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
159 {
160 struct sender_client *sc, *tmp;
161 struct private_http_sender_data *phsd;
162 int ret;
163
164 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
165 phsd = sc->private_data;
166 switch (phsd->status) {
167 case HTTP_STREAMING: /* nothing to do */
168 break;
169 case HTTP_CONNECTED: /* need to recv get request */
170 ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
171 if (ret < 0)
172 phsd->status = HTTP_INVALID_GET_REQUEST;
173 else if (ret > 0) {
174 phsd->status = HTTP_GOT_GET_REQUEST;
175 PARA_INFO_LOG("received get request\n");
176 }
177 break;
178 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
179 phsd->status = HTTP_STREAMING;
180 http_send_ok_msg(sc);
181 break;
182 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
183 if (http_send_err_msg(sc) >= 0)
184 shutdown_client(sc, hss);
185 break;
186 }
187 }
188 sc = accept_sender_client(hss, rfds);
189 if (!sc)
190 return;
191 phsd = para_malloc(sizeof(*phsd));
192 sc->private_data = phsd;
193 phsd->status = HTTP_CONNECTED;
194 }
195
196 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
197 {
198 struct sender_client *sc, *tmp;
199
200 if (hss->listen_fd < 0)
201 return;
202 para_fd_set(hss->listen_fd, rfds, max_fileno);
203 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
204 struct private_http_sender_data *phsd = sc->private_data;
205 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
206 para_fd_set(sc->fd, rfds, max_fileno);
207 if (phsd->status == HTTP_GOT_GET_REQUEST ||
208 phsd->status == HTTP_INVALID_GET_REQUEST)
209 para_fd_set(sc->fd, wfds, max_fileno);
210 }
211 }
212
213 static int http_com_on(__a_unused struct sender_command_data *scd)
214 {
215 return generic_com_on(hss, IPPROTO_TCP);
216 }
217
218 static int http_com_off(__a_unused struct sender_command_data *scd)
219 {
220 generic_com_off(hss);
221 return 1;
222 }
223
224 static int http_com_deny(struct sender_command_data *scd)
225 {
226 generic_com_deny(scd, hss);
227 return 1;
228 }
229
230 static int http_com_allow(struct sender_command_data *scd)
231 {
232 generic_com_allow(scd, hss);
233 return 1;
234 }
235
236 static char *http_status(void)
237 {
238 return generic_sender_status(hss, "http");
239 }
240
241 /**
242 * The init function of the http sender.
243 *
244 * \param s Pointer to the http sender struct.
245 *
246 * It initializes all function pointers of \a s, the client list and the access
247 * control list. If the autostart option was given, the tcp port is opened.
248 */
249 void http_send_init(struct sender *s)
250 {
251 int ret;
252 s->status = http_status;
253 s->send = http_send;
254 s->pre_select = http_pre_select;
255 s->post_select = http_post_select;
256 s->shutdown_clients = http_shutdown_clients;
257 s->resolve_target = NULL;
258 s->help = generic_sender_help;
259 s->client_cmds[SENDER_ON] = http_com_on;
260 s->client_cmds[SENDER_OFF] = http_com_off;
261 s->client_cmds[SENDER_DENY] = http_com_deny;
262 s->client_cmds[SENDER_ALLOW] = http_com_allow;
263 s->client_cmds[SENDER_ADD] = NULL;
264 s->client_cmds[SENDER_DELETE] = NULL;
265
266 init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
267 conf.http_port_arg, conf.http_max_clients_arg,
268 conf.http_default_deny_given);
269 if (conf.http_no_autostart_given)
270 return;
271 ret = generic_com_on(hss, IPPROTO_TCP);
272 if (ret < 0)
273 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
274 }