Merge branch 'maint' into next
[paraslash.git] / http_recv.c
1 /*
2 * Copyright (C) 2005-2009 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 <regex.h>
10 #include <sys/types.h>
11 #include <dirent.h>
12
13 #include "para.h"
14 #include "error.h"
15 #include "http.h"
16 #include "list.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "recv.h"
20 #include "http_recv.cmdline.h"
21 #include "net.h"
22 #include "string.h"
23 #include "fd.h"
24
25 /** the output buffer size of the http receiver */
26 #define BUFSIZE (32 * 1024)
27
28 /**
29 * the possible states of a http receiver node
30 *
31 * \sa receiver_node
32 */
33 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
34
35 /**
36 * data specific to the http receiver
37 *
38 * Each running instance of the http receiver reserves space for one such struct.
39 */
40 struct private_http_recv_data {
41 /**
42 *
43 *
44 * the current status of the http receiver node
45 *
46 * It gets initialized to \p HTTP_CONNECTED by the open function of the
47 * http receiver.
48 *
49 * \sa receiver::open, receiver_node.
50 */
51 enum http_recv_status status;
52 /**
53 *
54 *
55 * the file descriptor used for receiving the http stream
56 *
57 * The pre_select function of the http receiver adds this file descriptor to
58 * the set of file decriptors which are checked for reading/writing (depending
59 * on the current status) by the select loop of the application (para_audiod or
60 * para_recv).
61 *
62 * The post_select function of the http receiver uses \a fd, if ready, to
63 * establish the http connection, and updates \a status according to the new
64 * state of the connection. As soon as \a status is \p HTTP_STREAMING, \a fd is
65 * going to be only checked for reading. If data is available, it is read into
66 * the output buffer of the receiver node by post_select.
67 *
68 * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
69 */
70 int fd;
71 };
72
73 static void http_shutdown(void)
74 {
75 return;
76 }
77
78 static char *make_request_msg(void)
79 {
80 char *ret, *hn = para_hostname();
81 ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
82 HTTP_GET_MSG, hn, PACKAGE_VERSION);
83 free(hn);
84 return ret;
85 }
86
87 static void http_recv_pre_select(struct sched *s, struct task *t)
88 {
89 struct receiver_node *rn = container_of(t, struct receiver_node, task);
90 struct private_http_recv_data *phd = rn->private_data;
91
92 t->error = 0;
93 if (phd->status == HTTP_CONNECTED)
94 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
95 else
96 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
97 }
98
99
100 static void http_recv_post_select(struct sched *s, struct task *t)
101 {
102 struct receiver_node *rn = container_of(t, struct receiver_node, task);
103 struct private_http_recv_data *phd = rn->private_data;
104
105 if (rn->output_error && *rn->output_error < 0) {
106 t->error = *rn->output_error;
107 return;
108 }
109 if (phd->status == HTTP_CONNECTED) {
110 char *rq;
111 if (!FD_ISSET(phd->fd, &s->wfds))
112 return;
113 rq = make_request_msg();
114 PARA_INFO_LOG("sending http request\n");
115 t->error = send_va_buffer(phd->fd, "%s", rq);
116 free(rq);
117 if (t->error >= 0)
118 phd->status = HTTP_SENT_GET_REQUEST;
119 return;
120 }
121 if (!FD_ISSET(phd->fd, &s->rfds))
122 return;
123 if (phd->status == HTTP_SENT_GET_REQUEST) {
124 t->error = recv_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG));
125 if (t->error >= 0) {
126 PARA_INFO_LOG("received ok msg, streaming\n");
127 phd->status = HTTP_STREAMING;
128 }
129 return;
130 }
131 if (rn->loaded >= BUFSIZE) {
132 t->error = -E_HTTP_RECV_OVERRUN;
133 return;
134 }
135 t->error = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
136 BUFSIZE - rn->loaded);
137 if (t->error > 0) {
138 rn->loaded += t->error;
139 return;
140 }
141 if (!t->error)
142 t->error = -E_RECV_EOF;
143 }
144
145 static void http_recv_close(struct receiver_node *rn)
146 {
147 struct private_http_recv_data *phd = rn->private_data;
148 close(phd->fd);
149 free(rn->buf);
150 free(rn->private_data);
151 }
152
153 static void *http_recv_parse_config(int argc, char **argv)
154 {
155 struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
156
157 if (!http_recv_cmdline_parser(argc, argv, tmp))
158 return tmp;
159 free(tmp);
160 return NULL;
161 }
162
163 static int http_recv_open(struct receiver_node *rn)
164 {
165 struct private_http_recv_data *phd;
166 struct http_recv_args_info *conf = rn->conf;
167 int fd, ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg,
168 conf->port_arg);
169
170 if (ret < 0)
171 return ret;
172 fd = ret;
173 ret = mark_fd_nonblocking(fd);
174 if (ret < 0) {
175 close(fd);
176 return ret;
177 }
178 rn->buf = para_calloc(BUFSIZE);
179 rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
180 phd->fd = 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 struct http_recv_args_info dummy;
195
196 http_recv_cmdline_parser_init(&dummy);
197 r->open = http_recv_open;
198 r->close = http_recv_close;
199 r->pre_select = http_recv_pre_select;
200 r->post_select = http_recv_post_select;
201 r->shutdown = http_shutdown;
202 r->parse_config = http_recv_parse_config;
203 r->help = (struct ggo_help) {
204 .short_help = http_recv_args_info_help,
205 .detailed_help = http_recv_args_info_detailed_help
206 };
207 http_recv_cmdline_parser_free(&dummy);
208 }