more small audiod cleanups.
[paraslash.git] / http_recv.c
1 /*
2 * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file http_recv.c paraslash's http receiver */
20
21 #include "para.h"
22
23 #include "http.h"
24 #include "list.h"
25 #include "sched.h"
26 #include "recv.h"
27 #include "http_recv.cmdline.h"
28 #include "error.h"
29 #include "net.h"
30 #include "string.h"
31 #include "fd.h"
32
33 /** the output buffer size of the http receiver */
34 #define BUFSIZE (32 * 1024)
35
36 /**
37 * the possible states of a http receiver node
38 *
39 * \sa receiver_node
40 */
41 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
42
43 /**
44 * data specific to the http receiver
45 *
46 * Each running instance of the http receiver reserves space for one such struct.
47 */
48 struct private_http_recv_data {
49 /**
50 *
51 *
52 * the current status of the http receiver node
53 *
54 * It gets initialized to #HTTP_CONNECTED by the open function of the
55 * http receiver.
56 *
57 * \sa receiver::open, receiver_node.
58 */
59 enum http_recv_status status;
60 /**
61 *
62 *
63 * the file descriptor used for receiving the http stream
64 *
65 * The pre_select function of the http receiver adds this file descriptor to
66 * the set of file decriptors which are checked for reading/writing (depending
67 * on the current status) by the select loop of the application (para_audiod or
68 * para_recv).
69 *
70 * The post_select function of the http receiver uses \a fd, if ready, to
71 * establish the http connection, and updates \a status according to the new
72 * state of the connection. As soon as \a status is #HTTP_STREAMING, \a fd is
73 * going to be only checked for reading. If data is available, it is read into
74 * the output buffer of the receiver node by post_select.
75 *
76 * \sa receiver::pre_select receiver::post_select receiver_node
77 */
78 int fd;
79 };
80
81 static void http_shutdown(void)
82 {
83 return;
84 }
85
86 static char *make_request_msg(void)
87 {
88 char *ret, *hn = para_hostname();
89 ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
90 HTTP_GET_MSG, hn, VERSION);
91 free(hn);
92 return ret;
93 }
94
95 static void http_recv_pre_select(struct sched *s, struct task *t)
96 {
97 struct receiver_node *rn = t->private_data;
98 struct private_http_recv_data *phd = rn->private_data;
99
100 t->ret = 1;
101 if (phd->status == HTTP_CONNECTED)
102 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
103 else
104 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
105 }
106
107
108 static void http_recv_post_select(struct sched *s, struct task *t)
109 {
110 struct receiver_node *rn = t->private_data;
111 struct private_http_recv_data *phd = rn->private_data;
112
113 t->ret = 1;
114 if (!s->select_ret) /* we're not interested in timeouts */
115 return;
116 if (phd->status == HTTP_CONNECTED) {
117 char *rq;
118 if (!FD_ISSET(phd->fd, &s->wfds))
119 return; /* nothing to do */
120 rq = make_request_msg();
121 PARA_NOTICE_LOG("%s", "sending http request\n");
122 t->ret = send_va_buffer(phd->fd, "%s", rq);
123 free(rq);
124 if (t->ret > 0)
125 phd->status = HTTP_SENT_GET_REQUEST;
126 return;
127 }
128 if (!FD_ISSET(phd->fd, &s->rfds))
129 return; /* nothing to do */
130 if (phd->status == HTTP_SENT_GET_REQUEST) {
131 t->ret = recv_pattern(phd->fd, HTTP_OK_MSG, MAXLINE);
132 if (t->ret < 0)
133 return;
134 PARA_NOTICE_LOG("%s", "received ok msg, streaming\n");
135 phd->status = HTTP_STREAMING;
136 return;
137 }
138 t->ret = -E_OVERRUN;
139 /* already streaming */
140 if (rn->loaded >= BUFSIZE)
141 return;
142 t->ret = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
143 BUFSIZE - rn->loaded);
144 if (t->ret <= 0) {
145 rn->eof = 1;
146 if (!t->ret)
147 t->ret = -E_HTTP_RECV_EOF;
148 return;
149 }
150 rn->loaded += t->ret;
151 }
152
153 static void http_recv_close(struct receiver_node *rn)
154 {
155 struct private_http_recv_data *phd = rn->private_data;
156 close(phd->fd);
157 free(rn->buf);
158 free(rn->private_data);
159 }
160
161 static void *http_recv_parse_config(int argc, char **argv)
162 {
163 struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
164
165 if (!http_recv_cmdline_parser(argc, argv, tmp))
166 return tmp;
167 free(tmp);
168 return NULL;
169 }
170
171 static int http_recv_open(struct receiver_node *rn)
172 {
173 struct private_http_recv_data *phd;
174 struct hostent *he;
175 struct http_recv_args_info *conf = rn->conf;
176 struct sockaddr_in their_addr;
177 int ret;
178
179 rn->buf = para_calloc(BUFSIZE);
180 rn->private_data = para_calloc(sizeof(struct private_http_recv_data));
181 phd = rn->private_data;
182 PARA_NOTICE_LOG("phd = %p, rn = %p\n", phd, rn);
183 ret = -E_HOST_INFO;
184 if (!(he = get_host_info(conf->host_arg)))
185 goto err_out;
186 /* get new socket */
187 ret = -E_SOCKET;
188 if ((phd->fd = get_socket()) < 0)
189 goto err_out;
190 /* init their_addr */
191 init_sockaddr(&their_addr, conf->port_arg, he);
192 /* connect */
193 PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg,
194 conf->port_arg);
195 ret = para_connect(phd->fd, &their_addr);
196 if (ret < 0)
197 goto err_out;
198 phd->status = HTTP_CONNECTED;
199 return 1;
200 err_out:
201 free(rn->private_data);
202 free(rn->buf);
203 return ret;
204 }
205
206 /**
207 * the init function of the http receiver
208 *
209 * \param r pointer to the receiver struct to initialize
210 *
211 * Just initialize all function pointers of \a r.
212 */
213 void http_recv_init(struct receiver *r)
214 {
215 r->open = http_recv_open;
216 r->close = http_recv_close;
217 r->pre_select = http_recv_pre_select;
218 r->post_select = http_recv_post_select;
219 r->shutdown = http_shutdown;
220 r->parse_config = http_recv_parse_config;
221 }