Merge commit 'fml/master'
[paraslash.git] / http_send.c
1 /*
2 * Copyright (C) 2005-2008 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 <sys/types.h>
10 #include <dirent.h>
11
12 #include "para.h"
13 #include "error.h"
14 #include "string.h"
15 #include "server.cmdline.h"
16 #include "afh.h"
17 #include "afs.h"
18 #include "server.h"
19 #include "http.h"
20 #include "vss.h"
21 #include "list.h"
22 #include "send.h"
23 #include "close_on_fork.h"
24 #include "net.h"
25 #include "fd.h"
26 #include "chunk_queue.h"
27 #include "acl.h"
28
29 /** Message sent to clients that do not send a valid get request. */
30 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
31
32 /** The possible states of a client from the server's POV. */
33 enum http_client_status {
34 /** We accepted the connection on the tcp socket. */
35 HTTP_CONNECTED,
36 /** Successfully received the get request. */
37 HTTP_GOT_GET_REQUEST,
38 /** Connection is ready for sending audio data. */
39 HTTP_STREAMING,
40 /** We didn't receive a valid get request. */
41 HTTP_INVALID_GET_REQUEST
42 };
43
44 struct private_http_sender_data {
45 enum http_client_status status;
46 };
47
48 static struct sender_status http_sender_status, *hss = &http_sender_status;
49
50 static int http_send_msg(struct sender_client *sc, const char *msg)
51 {
52 int ret = send_buffer(sc->fd, msg);
53
54 if (ret < 0)
55 shutdown_client(sc, hss);
56 return ret;
57 }
58
59 static void http_send_ok_msg(struct sender_client *sc)
60 {
61 PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
62 http_send_msg(sc, HTTP_OK_MSG);
63 }
64
65 static int http_send_err_msg(struct sender_client *sc)
66 {
67 PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
68 return http_send_msg(sc, HTTP_ERR_MSG);
69 }
70
71 static void http_shutdown_clients(void)
72 {
73 shutdown_clients(hss);
74 }
75
76 static void http_send(long unsigned current_chunk,
77 __a_unused long unsigned chunks_sent, const char *buf, size_t len,
78 const char *header_buf, size_t header_len)
79 {
80 struct sender_client *sc, *tmp;
81
82 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
83 struct private_http_sender_data *phsd = sc->private_data;
84 if (phsd->status != HTTP_STREAMING)
85 continue;
86 send_chunk(sc, hss, 0, current_chunk, buf, len, header_buf,
87 header_len);
88 }
89 }
90
91 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
92 {
93 struct sender_client *sc, *tmp;
94 struct private_http_sender_data *phsd;
95
96 if (hss->listen_fd < 0)
97 return;
98 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
99 phsd = sc->private_data;
100 switch (phsd->status) {
101 case HTTP_STREAMING: /* nothing to do */
102 break;
103 case HTTP_CONNECTED: /* need to recv get request */
104 if (FD_ISSET(sc->fd, rfds)) {
105 if (recv_pattern(sc->fd, HTTP_GET_MSG, MAXLINE)
106 < 0) {
107 phsd->status = HTTP_INVALID_GET_REQUEST;
108 } else {
109 phsd->status = HTTP_GOT_GET_REQUEST;
110 PARA_INFO_LOG("received get request\n");
111 }
112 }
113 break;
114 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
115 phsd->status = HTTP_STREAMING;
116 http_send_ok_msg(sc);
117 break;
118 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
119 if (http_send_err_msg(sc) >= 0)
120 shutdown_client(sc, hss);
121 break;
122 }
123 }
124 if (!FD_ISSET(hss->listen_fd, rfds))
125 return;
126 sc = accept_sender_client(hss);
127 if (!sc)
128 return;
129 phsd = para_malloc(sizeof(*phsd));
130 sc->private_data = phsd;
131 phsd->status = HTTP_CONNECTED;
132 }
133
134 static void http_pre_select(int *max_fileno, fd_set *rfds, __a_unused fd_set *wfds)
135 {
136 struct sender_client *sc, *tmp;
137
138 if (hss->listen_fd < 0)
139 return;
140 para_fd_set(hss->listen_fd, rfds, max_fileno);
141 list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
142 struct private_http_sender_data *phsd = sc->private_data;
143 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
144 para_fd_set(sc->fd, rfds, max_fileno);
145 }
146 }
147
148 static int http_com_on(__a_unused struct sender_command_data *scd)
149 {
150 return generic_com_on(hss, IPPROTO_TCP);
151 }
152
153 static int http_com_off(__a_unused struct sender_command_data *scd)
154 {
155 generic_com_off(hss);
156 return 1;
157 }
158
159 static int http_com_deny(struct sender_command_data *scd)
160 {
161 generic_com_deny(scd, hss);
162 return 1;
163 }
164
165 static int http_com_allow(struct sender_command_data *scd)
166 {
167 generic_com_allow(scd, hss);
168 return 1;
169 }
170
171 static char *http_info(void)
172 {
173 return get_sender_info(hss, "http");
174 }
175
176 /**
177 * The init function of the http sender.
178 *
179 * \param s Pointer to the http sender struct.
180 *
181 * It initializes all function pointers of \a s, the client list and the access
182 * control list. If the autostart option was given, the tcp port is opened.
183 */
184 void http_send_init(struct sender *s)
185 {
186 int ret;
187 s->info = http_info;
188 s->send = http_send;
189 s->pre_select = http_pre_select;
190 s->post_select = http_post_select;
191 s->shutdown_clients = http_shutdown_clients;
192 s->help = generic_sender_help;
193 s->client_cmds[SENDER_ON] = http_com_on;
194 s->client_cmds[SENDER_OFF] = http_com_off;
195 s->client_cmds[SENDER_DENY] = http_com_deny;
196 s->client_cmds[SENDER_ALLOW] = http_com_allow;
197 s->client_cmds[SENDER_ADD] = NULL;
198 s->client_cmds[SENDER_DELETE] = NULL;
199
200 init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
201 conf.http_port_arg, conf.http_max_clients_arg,
202 conf.http_default_deny_given);
203 if (conf.http_no_autostart_given)
204 return;
205 ret = generic_com_on(hss, IPPROTO_TCP);
206 if (ret < 0)
207 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
208 }