Basic infrastructure changes for FEC/DCCP support.
[paraslash.git] / http_send.c
1 /*
2 * Copyright (C) 2005-2010 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 <dirent.h>
12 #include <osl.h>
13
14 #include "para.h"
15 #include "error.h"
16 #include "string.h"
17 #include "server.cmdline.h"
18 #include "afh.h"
19 #include "afs.h"
20 #include "server.h"
21 #include "http.h"
22 #include "list.h"
23 #include "send.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 = send_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 void http_send(long unsigned current_chunk,
81 __a_unused long unsigned chunks_sent, const char *buf, size_t len,
82 const char *header_buf, size_t header_len)
83 {
84 struct sender_client *sc, *tmp;
85
86 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
87 struct private_http_sender_data *phsd = sc->private_data;
88 if (phsd->status != HTTP_STREAMING)
89 continue;
90 send_chunk(sc, hss, 0, current_chunk, buf, len, header_buf,
91 header_len);
92 }
93 }
94
95 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
96 {
97 struct sender_client *sc, *tmp;
98 struct private_http_sender_data *phsd;
99 int ret;
100
101 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
102 phsd = sc->private_data;
103 switch (phsd->status) {
104 case HTTP_STREAMING: /* nothing to do */
105 break;
106 case HTTP_CONNECTED: /* need to recv get request */
107 ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
108 if (ret < 0)
109 phsd->status = HTTP_INVALID_GET_REQUEST;
110 else if (ret > 0) {
111 phsd->status = HTTP_GOT_GET_REQUEST;
112 PARA_INFO_LOG("received get request\n");
113 }
114 break;
115 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
116 phsd->status = HTTP_STREAMING;
117 http_send_ok_msg(sc);
118 break;
119 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
120 if (http_send_err_msg(sc) >= 0)
121 shutdown_client(sc, hss);
122 break;
123 }
124 }
125 sc = accept_sender_client(hss, rfds);
126 if (!sc)
127 return;
128 phsd = para_malloc(sizeof(*phsd));
129 sc->private_data = phsd;
130 phsd->status = HTTP_CONNECTED;
131 }
132
133 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
134 {
135 struct sender_client *sc, *tmp;
136
137 if (hss->listen_fd < 0)
138 return;
139 para_fd_set(hss->listen_fd, rfds, max_fileno);
140 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
141 struct private_http_sender_data *phsd = sc->private_data;
142 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
143 para_fd_set(sc->fd, rfds, max_fileno);
144 if (phsd->status == HTTP_GOT_GET_REQUEST ||
145 phsd->status == HTTP_INVALID_GET_REQUEST)
146 para_fd_set(sc->fd, wfds, max_fileno);
147 }
148 }
149
150 static int http_com_on(__a_unused struct sender_command_data *scd)
151 {
152 return generic_com_on(hss, IPPROTO_TCP);
153 }
154
155 static int http_com_off(__a_unused struct sender_command_data *scd)
156 {
157 generic_com_off(hss);
158 return 1;
159 }
160
161 static int http_com_deny(struct sender_command_data *scd)
162 {
163 generic_com_deny(scd, hss);
164 return 1;
165 }
166
167 static int http_com_allow(struct sender_command_data *scd)
168 {
169 generic_com_allow(scd, hss);
170 return 1;
171 }
172
173 static char *http_info(void)
174 {
175 return get_sender_info(hss, "http");
176 }
177
178 /**
179 * The init function of the http sender.
180 *
181 * \param s Pointer to the http sender struct.
182 *
183 * It initializes all function pointers of \a s, the client list and the access
184 * control list. If the autostart option was given, the tcp port is opened.
185 */
186 void http_send_init(struct sender *s)
187 {
188 int ret;
189 s->info = http_info;
190 s->send = http_send;
191 s->pre_select = http_pre_select;
192 s->post_select = http_post_select;
193 s->shutdown_clients = http_shutdown_clients;
194 s->help = generic_sender_help;
195 s->client_cmds[SENDER_ON] = http_com_on;
196 s->client_cmds[SENDER_OFF] = http_com_off;
197 s->client_cmds[SENDER_DENY] = http_com_deny;
198 s->client_cmds[SENDER_ALLOW] = http_com_allow;
199 s->client_cmds[SENDER_ADD] = NULL;
200 s->client_cmds[SENDER_DELETE] = NULL;
201
202 init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
203 conf.http_port_arg, conf.http_max_clients_arg,
204 conf.http_default_deny_given);
205 if (conf.http_no_autostart_given)
206 return;
207 ret = generic_com_on(hss, IPPROTO_TCP);
208 if (ret < 0)
209 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
210 }