8c19d6d743c38c58398087029fddf1ddc7a1f348
[paraslash.git] / http_recv.c
1 /*
2 * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file http_recv.c paraslash's http receiver */
8
9 #include <sys/types.h>
10 #include <dirent.h>
11
12 #include "para.h"
13 #include "error.h"
14 #include "http.h"
15 #include "list.h"
16 #include "sched.h"
17 #include "recv.h"
18 #include "http_recv.cmdline.h"
19 #include "net.h"
20 #include "string.h"
21 #include "fd.h"
22
23 /** the output buffer size of the http receiver */
24 #define BUFSIZE (32 * 1024)
25
26 /**
27 * the possible states of a http receiver node
28 *
29 * \sa receiver_node
30 */
31 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
32
33 /**
34 * data specific to the http receiver
35 *
36 * Each running instance of the http receiver reserves space for one such struct.
37 */
38 struct private_http_recv_data {
39 /**
40 *
41 *
42 * the current status of the http receiver node
43 *
44 * It gets initialized to \p HTTP_CONNECTED by the open function of the
45 * http receiver.
46 *
47 * \sa receiver::open, receiver_node.
48 */
49 enum http_recv_status status;
50 /**
51 *
52 *
53 * the file descriptor used for receiving the http stream
54 *
55 * The pre_select function of the http receiver adds this file descriptor to
56 * the set of file decriptors which are checked for reading/writing (depending
57 * on the current status) by the select loop of the application (para_audiod or
58 * para_recv).
59 *
60 * The post_select function of the http receiver uses \a fd, if ready, to
61 * establish the http connection, and updates \a status according to the new
62 * state of the connection. As soon as \a status is \p HTTP_STREAMING, \a fd is
63 * going to be only checked for reading. If data is available, it is read into
64 * the output buffer of the receiver node by post_select.
65 *
66 * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
67 */
68 int fd;
69 };
70
71 static void http_shutdown(void)
72 {
73 return;
74 }
75
76 static char *make_request_msg(void)
77 {
78 char *ret, *hn = para_hostname();
79 ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
80 HTTP_GET_MSG, hn, PACKAGE_VERSION);
81 free(hn);
82 return ret;
83 }
84
85 static void http_recv_pre_select(struct sched *s, struct task *t)
86 {
87 struct receiver_node *rn = t->private_data;
88 struct private_http_recv_data *phd = rn->private_data;
89
90 t->ret = 1;
91 if (phd->status == HTTP_CONNECTED)
92 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
93 else
94 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
95 }
96
97
98 static void http_recv_post_select(struct sched *s, struct task *t)
99 {
100 struct receiver_node *rn = t->private_data;
101 struct private_http_recv_data *phd = rn->private_data;
102
103 if (rn->output_error && *rn->output_error) {
104 t->ret = *rn->output_error;
105 goto out;
106 }
107 t->ret = 1;
108 if (!s->select_ret)
109 goto out;
110 if (phd->status == HTTP_CONNECTED) {
111 char *rq;
112 if (!FD_ISSET(phd->fd, &s->wfds))
113 goto out;
114 rq = make_request_msg();
115 PARA_INFO_LOG("%s", "sending http request\n");
116 t->ret = send_va_buffer(phd->fd, "%s", rq);
117 free(rq);
118 if (t->ret > 0)
119 phd->status = HTTP_SENT_GET_REQUEST;
120 goto out;
121 }
122 if (!FD_ISSET(phd->fd, &s->rfds))
123 goto out;
124 if (phd->status == HTTP_SENT_GET_REQUEST) {
125 t->ret = recv_pattern(phd->fd, HTTP_OK_MSG, MAXLINE);
126 if (t->ret < 0)
127 goto out;
128 PARA_INFO_LOG("%s", "received ok msg, streaming\n");
129 t->ret = 1;
130 phd->status = HTTP_STREAMING;
131 goto out;
132 }
133 t->ret = -E_HTTP_RECV_OVERRUN;
134 if (rn->loaded >= BUFSIZE)
135 goto out;
136 t->ret = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
137 BUFSIZE - rn->loaded);
138 if (t->ret <= 0) {
139 if (!t->ret)
140 t->ret = -E_RECV_EOF;
141 goto out;
142 }
143 rn->loaded += t->ret;
144 out:
145 if (t->ret < 0)
146 rn->error = t->ret;
147 }
148
149 static void http_recv_close(struct receiver_node *rn)
150 {
151 struct private_http_recv_data *phd = rn->private_data;
152 close(phd->fd);
153 free(rn->buf);
154 free(rn->private_data);
155 }
156
157 static void *http_recv_parse_config(int argc, char **argv)
158 {
159 struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
160
161 if (!http_recv_cmdline_parser(argc, argv, tmp))
162 return tmp;
163 free(tmp);
164 return NULL;
165 }
166
167 static int http_recv_open(struct receiver_node *rn)
168 {
169 struct private_http_recv_data *phd;
170 struct http_recv_args_info *conf = rn->conf;
171 int ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg, conf->port_arg);
172
173 if (ret < 0)
174 return ret;
175
176 rn->buf = para_calloc(BUFSIZE);
177 rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
178
179 phd->fd = ret;
180 mark_fd_nonblocking(phd->fd);
181 phd->status = HTTP_CONNECTED;
182 return 1;
183 }
184
185 /**
186 * the init function of the http receiver
187 *
188 * \param r pointer to the receiver struct to initialize
189 *
190 * Just initialize all function pointers of \a r.
191 */
192 void http_recv_init(struct receiver *r)
193 {
194 r->open = http_recv_open;
195 r->close = http_recv_close;
196 r->pre_select = http_recv_pre_select;
197 r->post_select = http_recv_post_select;
198 r->shutdown = http_shutdown;
199 r->parse_config = http_recv_parse_config;
200 }