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          * The file descriptor used for receiving the http stream.
  49          *
  50          * The pre_select function of the http receiver adds this file descriptor to
  51          * the set of file descriptors which are checked for reading/writing (depending
  52          * on the current status) by the select loop of the application (para_audiod or
  53          * para_recv).
  54          *
  55          * The post_select function of the http receiver uses \a fd, if ready, to
  56          * establish the http connection, and updates \a status according to the new
  57          * state of the connection.  As soon as \a status is \p HTTP_STREAMING, \a fd is
  58          * going to be only checked for reading. If data is available, it is read into
  59          * the output buffer of the receiver node by post_select.
  60          *
  61          * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
  62          */
  63         int fd;
  64         struct btr_pool *btrp;
  65 };
  66
  67 static char *make_request_msg(void)
  68 {
  69         char *ret, *hn = para_hostname();
  70         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  71                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  72         free(hn);
  73         return ret;
  74 }
  75
  76 static void http_recv_pre_select(struct sched *s, struct task *t)
  77 {
  78         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  79         struct private_http_recv_data *phd = rn->private_data;
  80
  81         t->error = 0;
  82         if (generic_recv_pre_select(s, t) <= 0)
  83                 return;
  84         if  (phd->status == HTTP_CONNECTED)
  85                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
  86         else
  87                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
  88 }
  89
  90 static void http_recv_post_select(struct sched *s, struct task *t)
  91 {
  92         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  93         struct private_http_recv_data *phd = rn->private_data;
  94         struct btr_node *btrn = rn->btrn;
  95         int ret;
  96         char *buf;
  97         size_t sz, n;
  98
  99         t->error = 0;
 100         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 101         if (ret < 0)
 102                 goto err;
 103         if (ret == 0)
 104                 return;
 105         if (phd->status == HTTP_CONNECTED) {
 106                 char *rq;
 107                 if (!FD_ISSET(phd->fd, &s->wfds))
 108                         return;
 109                 rq = make_request_msg();
 110                 PARA_INFO_LOG("sending http request\n");
 111                 ret = send_va_buffer(phd->fd, "%s", rq);
 112                 free(rq);
 113                 if (ret < 0)
 114                         goto err;
 115                 phd->status = HTTP_SENT_GET_REQUEST;
 116                 return;
 117         }
 118         if (phd->status == HTTP_SENT_GET_REQUEST) {
 119                 ret = read_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG), &s->rfds);
 120                 if (ret < 0)
 121                         goto err;
 122                 if (ret == 0)
 123                         return;
 124                 PARA_INFO_LOG("received ok msg, streaming\n");
 125                 phd->status = HTTP_STREAMING;
 126                 return;
 127         }
 128         ret = -E_HTTP_RECV_OVERRUN;
 129         sz = btr_pool_get_buffer(phd->btrp, &buf);
 130         if (sz == 0)
 131                 goto err;
 132         ret = read_nonblock(phd->fd, buf, sz, &s->rfds, &n);
 133         if (n > 0)
 134                 btr_add_output_pool(phd->btrp, n, btrn);
 135         if (ret >= 0)
 136                 return;
 137 err:
 138         btr_remove_node(rn->btrn);
 139         t->error = ret;
 140 }
 141
 142 static void http_recv_close(struct receiver_node *rn)
 143 {
 144         struct private_http_recv_data *phd = rn->private_data;
 145
 146         close(phd->fd);
 147         btr_pool_free(phd->btrp);
 148         free(rn->private_data);
 149 }
 150
 151 static void *http_recv_parse_config(int argc, char **argv)
 152 {
 153         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 154
 155         if (!http_recv_cmdline_parser(argc, argv, tmp))
 156                 return tmp;
 157         free(tmp);
 158         return NULL;
 159 }
 160
 161 static int http_recv_open(struct receiver_node *rn)
 162 {
 163         struct private_http_recv_data *phd;
 164         struct http_recv_args_info *conf = rn->conf;
 165         int fd, ret = para_connect_simple(IPPROTO_TCP, conf->host_arg,
 166                                                        conf->port_arg);
 167
 168         if (ret < 0)
 169                 return ret;
 170         fd = ret;
 171         ret = mark_fd_nonblocking(fd);
 172         if (ret < 0) {
 173                 close(fd);
 174                 return ret;
 175         }
 176         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 177         phd->fd = fd;
 178         phd->status = HTTP_CONNECTED;
 179         phd->btrp = btr_pool_new("http_recv", 320 * 1024);
 180         return 1;
 181 }
 182
 183 static void http_recv_free_config(void *conf)
 184 {
 185         http_recv_cmdline_parser_free(conf);
 186         free(conf);
 187 }
 188
 189 /**
 190  * The init function of the http receiver.
 191  *
 192  * \param r Pointer to the receiver struct to initialize.
 193  *
 194  * This initializes all function pointers of \a r.
 195  */
 196 void http_recv_init(struct receiver *r)
 197 {
 198         struct http_recv_args_info dummy;
 199
 200         http_recv_cmdline_parser_init(&dummy);
 201         r->open = http_recv_open;
 202         r->close = http_recv_close;
 203         r->pre_select = http_recv_pre_select;
 204         r->post_select = http_recv_post_select;
 205         r->parse_config = http_recv_parse_config;
 206         r->free_config = http_recv_free_config;
 207         r->help = (struct ggo_help) {
 208                 .short_help = http_recv_args_info_help,
 209                 .detailed_help = http_recv_args_info_detailed_help
 210         };
 211         http_recv_cmdline_parser_free(&dummy);
 212 }