d4fe29ad686846cd3ee1b6d3617bdf7e329d73f1
[paraslash.git] / http_recv.c
1 /*
2 * Copyright (C) 2005-2011 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
12 #include "para.h"
13 #include "error.h"
14 #include "http.h"
15 #include "list.h"
16 #include "sched.h"
17 #include "ggo.h"
18 #include "recv.h"
19 #include "http_recv.cmdline.h"
20 #include "net.h"
21 #include "string.h"
22 #include "fd.h"
23 #include "buffer_tree.h"
24
25 /**
26 * the possible states of a http receiver node
27 *
28 * \sa receiver_node
29 */
30 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
31
32 /**
33 * Data specific to the http receiver.
34 *
35 * Each running instance of the http receiver reserves space for one such struct.
36 */
37 struct private_http_recv_data {
38 /**
39 * The current status of the http receiver node.
40 *
41 * It gets initialized to \p HTTP_CONNECTED by the open function of the
42 * http receiver.
43 *
44 * \sa receiver::open, receiver_node.
45 */
46 enum http_recv_status status;
47 };
48
49 static char *make_request_msg(void)
50 {
51 char *ret, *hn = para_hostname();
52 ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
53 HTTP_GET_MSG, hn, PACKAGE_VERSION);
54 free(hn);
55 return ret;
56 }
57
58 static void http_recv_pre_select(struct sched *s, struct task *t)
59 {
60 struct receiver_node *rn = container_of(t, struct receiver_node, task);
61 struct private_http_recv_data *phd = rn->private_data;
62
63 t->error = 0;
64 if (generic_recv_pre_select(s, t) <= 0)
65 return;
66 if (phd->status == HTTP_CONNECTED)
67 para_fd_set(rn->fd, &s->wfds, &s->max_fileno);
68 else
69 para_fd_set(rn->fd, &s->rfds, &s->max_fileno);
70 }
71
72 /*
73 * Establish the http connection. If already established, fill the buffer pool
74 * area with data read from the socket. In any case, update the state of the
75 * connection if necessary.
76 */
77 static void http_recv_post_select(struct sched *s, struct task *t)
78 {
79 struct receiver_node *rn = container_of(t, struct receiver_node, task);
80 struct private_http_recv_data *phd = rn->private_data;
81 struct btr_node *btrn = rn->btrn;
82 int ret;
83 char *buf;
84 size_t sz, n;
85
86 t->error = 0;
87 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
88 if (ret < 0)
89 goto err;
90 if (ret == 0)
91 return;
92 if (phd->status == HTTP_CONNECTED) {
93 char *rq;
94 if (!FD_ISSET(rn->fd, &s->wfds))
95 return;
96 rq = make_request_msg();
97 PARA_INFO_LOG("sending http request\n");
98 ret = send_va_buffer(rn->fd, "%s", rq);
99 free(rq);
100 if (ret < 0)
101 goto err;
102 phd->status = HTTP_SENT_GET_REQUEST;
103 return;
104 }
105 if (phd->status == HTTP_SENT_GET_REQUEST) {
106 ret = read_pattern(rn->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG), &s->rfds);
107 if (ret < 0)
108 goto err;
109 if (ret == 0)
110 return;
111 PARA_INFO_LOG("received ok msg, streaming\n");
112 phd->status = HTTP_STREAMING;
113 return;
114 }
115 ret = -E_HTTP_RECV_OVERRUN;
116 sz = btr_pool_get_buffer(rn->btrp, &buf);
117 if (sz == 0)
118 goto err;
119 ret = read_nonblock(rn->fd, buf, sz, &s->rfds, &n);
120 if (n > 0)
121 btr_add_output_pool(rn->btrp, n, btrn);
122 if (ret >= 0)
123 return;
124 err:
125 btr_remove_node(rn->btrn);
126 t->error = ret;
127 }
128
129 static void http_recv_close(struct receiver_node *rn)
130 {
131 close(rn->fd);
132 btr_pool_free(rn->btrp);
133 free(rn->private_data);
134 }
135
136 static void *http_recv_parse_config(int argc, char **argv)
137 {
138 struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
139
140 if (!http_recv_cmdline_parser(argc, argv, tmp))
141 return tmp;
142 free(tmp);
143 return NULL;
144 }
145
146 static int http_recv_open(struct receiver_node *rn)
147 {
148 struct private_http_recv_data *phd;
149 struct http_recv_args_info *conf = rn->conf;
150 int fd, ret = para_connect_simple(IPPROTO_TCP, conf->host_arg,
151 conf->port_arg);
152
153 if (ret < 0)
154 return ret;
155 fd = ret;
156 ret = mark_fd_nonblocking(fd);
157 if (ret < 0) {
158 close(fd);
159 return ret;
160 }
161 rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
162 rn->fd = fd;
163 phd->status = HTTP_CONNECTED;
164 rn->btrp = btr_pool_new("http_recv", 320 * 1024);
165 return 1;
166 }
167
168 static void http_recv_free_config(void *conf)
169 {
170 http_recv_cmdline_parser_free(conf);
171 free(conf);
172 }
173
174 /**
175 * The init function of the http receiver.
176 *
177 * \param r Pointer to the receiver struct to initialize.
178 *
179 * This initializes all function pointers of \a r.
180 */
181 void http_recv_init(struct receiver *r)
182 {
183 struct http_recv_args_info dummy;
184
185 http_recv_cmdline_parser_init(&dummy);
186 r->open = http_recv_open;
187 r->close = http_recv_close;
188 r->pre_select = http_recv_pre_select;
189 r->post_select = http_recv_post_select;
190 r->parse_config = http_recv_parse_config;
191 r->free_config = http_recv_free_config;
192 r->help = (struct ggo_help) {
193 .short_help = http_recv_args_info_help,
194 .detailed_help = http_recv_args_info_detailed_help
195 };
196 http_recv_cmdline_parser_free(&dummy);
197 }