Make para_fsck work without specifying tables.
[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 t->ret = -E_HTTP_RECV_EOF;
104 if (rn->output_eof && *rn->output_eof)
105 goto out;
106 t->ret = 1;
107 if (!s->select_ret)
108 goto out;
109 if (phd->status == HTTP_CONNECTED) {
110 char *rq;
111 if (!FD_ISSET(phd->fd, &s->wfds))
112 goto out;
113 rq = make_request_msg();
114 PARA_INFO_LOG("%s", "sending http request\n");
115 t->ret = send_va_buffer(phd->fd, "%s", rq);
116 free(rq);
117 if (t->ret > 0)
118 phd->status = HTTP_SENT_GET_REQUEST;
119 goto out;
120 }
121 if (!FD_ISSET(phd->fd, &s->rfds))
122 goto out;
123 if (phd->status == HTTP_SENT_GET_REQUEST) {
124 t->ret = recv_pattern(phd->fd, HTTP_OK_MSG, MAXLINE);
125 if (t->ret < 0)
126 goto out;
127 PARA_INFO_LOG("%s", "received ok msg, streaming\n");
128 t->ret = 1;
129 phd->status = HTTP_STREAMING;
130 goto out;
131 }
132 t->ret = -E_HTTP_RECV_OVERRUN;
133 if (rn->loaded >= BUFSIZE)
134 goto out;
135 t->ret = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
136 BUFSIZE - rn->loaded);
137 if (t->ret <= 0) {
138 if (!t->ret)
139 t->ret = -E_HTTP_RECV_EOF;
140 goto out;
141 }
142 rn->loaded += t->ret;
143 out:
144 if (t->ret < 0)
145 rn->eof = 1;
146 }
147
148 static void http_recv_close(struct receiver_node *rn)
149 {
150 struct private_http_recv_data *phd = rn->private_data;
151 close(phd->fd);
152 free(rn->buf);
153 free(rn->private_data);
154 }
155
156 static void *http_recv_parse_config(int argc, char **argv)
157 {
158 struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
159
160 if (!http_recv_cmdline_parser(argc, argv, tmp))
161 return tmp;
162 free(tmp);
163 return NULL;
164 }
165
166 static int http_recv_open(struct receiver_node *rn)
167 {
168 struct private_http_recv_data *phd;
169 struct hostent *he;
170 struct http_recv_args_info *conf = rn->conf;
171 struct sockaddr_in their_addr;
172 int ret;
173
174 rn->buf = para_calloc(BUFSIZE);
175 rn->private_data = para_calloc(sizeof(struct private_http_recv_data));
176 phd = rn->private_data;
177 ret = get_host_info(conf->host_arg, &he);
178 if (ret < 0)
179 goto err_out;
180 ret = get_stream_socket(AF_INET);
181 if (ret < 0)
182 goto err_out;
183 phd->fd = ret;
184 /* init their_addr */
185 init_sockaddr(&their_addr, conf->port_arg, he);
186 PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg,
187 conf->port_arg);
188 ret = PARA_CONNECT(phd->fd, &their_addr);
189 if (ret < 0) {
190 close(phd->fd);
191 goto err_out;
192 }
193 mark_fd_nonblock(phd->fd);
194 phd->status = HTTP_CONNECTED;
195 return 1;
196 err_out:
197 free(rn->private_data);
198 free(rn->buf);
199 return ret;
200 }
201
202 /**
203 * the init function of the http receiver
204 *
205 * \param r pointer to the receiver struct to initialize
206 *
207 * Just initialize all function pointers of \a r.
208 */
209 void http_recv_init(struct receiver *r)
210 {
211 r->open = http_recv_open;
212 r->close = http_recv_close;
213 r->pre_select = http_recv_pre_select;
214 r->post_select = http_recv_post_select;
215 r->shutdown = http_shutdown;
216 r->parse_config = http_recv_parse_config;
217 }