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 #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 #include "buffer_tree.h"
  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          * The current status of the http receiver node.
  41          *
  42          * It gets initialized to \p HTTP_CONNECTED by the open function of the
  43          * http receiver.
  44          *
  45          * \sa receiver::open, receiver_node.
  46          */
  47         enum http_recv_status status;
  48         /**
  49          * The file descriptor used for receiving the http stream.
  50          *
  51          * The pre_select function of the http receiver adds this file descriptor to
  52          * the set of file descriptors which are checked for reading/writing (depending
  53          * on the current status) by the select loop of the application (para_audiod or
  54          * para_recv).
  55          *
  56          * The post_select function of the http receiver uses \a fd, if ready, to
  57          * establish the http connection, and updates \a status according to the new
  58          * state of the connection.  As soon as \a status is \p HTTP_STREAMING, \a fd is
  59          * going to be only checked for reading. If data is available, it is read into
  60          * the output buffer of the receiver node by post_select.
  61          *
  62          * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
  63          */
  64         int fd;
  65         struct btr_pool *btrp;
  66 };
  67
  68 static char *make_request_msg(void)
  69 {
  70         char *ret, *hn = para_hostname();
  71         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  72                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  73         free(hn);
  74         return ret;
  75 }
  76
  77 static void http_recv_pre_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
  82         t->error = 0;
  83         if (generic_recv_pre_select(s, t) <= 0)
  84                 return;
  85         if  (phd->status == HTTP_CONNECTED)
  86                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
  87         else
  88                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
  89 }
  90
  91 static void http_recv_post_select(struct sched *s, struct task *t)
  92 {
  93         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  94         struct private_http_recv_data *phd = rn->private_data;
  95         struct btr_node *btrn = rn->btrn;
  96         int ret;
  97         char *buf;
  98         size_t sz, n;
  99
 100         t->error = 0;
 101         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 102         if (ret < 0)
 103                 goto err;
 104         if (ret == 0)
 105                 return;
 106         if (phd->status == HTTP_CONNECTED) {
 107                 char *rq;
 108                 if (!FD_ISSET(phd->fd, &s->wfds))
 109                         return;
 110                 rq = make_request_msg();
 111                 PARA_INFO_LOG("sending http request\n");
 112                 ret = send_va_buffer(phd->fd, "%s", rq);
 113                 free(rq);
 114                 if (ret < 0)
 115                         goto err;
 116                 phd->status = HTTP_SENT_GET_REQUEST;
 117                 return;
 118         }
 119         if (phd->status == HTTP_SENT_GET_REQUEST) {
 120                 ret = read_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG), &s->rfds);
 121                 if (ret < 0)
 122                         goto err;
 123                 if (ret == 0)
 124                         return;
 125                 PARA_INFO_LOG("received ok msg, streaming\n");
 126                 phd->status = HTTP_STREAMING;
 127                 return;
 128         }
 129         ret = -E_HTTP_RECV_OVERRUN;
 130         sz = btr_pool_get_buffer(phd->btrp, &buf);
 131         if (sz == 0)
 132                 goto err;
 133         ret = read_nonblock(phd->fd, buf, sz, &s->rfds, &n);
 134         if (n > 0)
 135                 btr_add_output_pool(phd->btrp, n, btrn);
 136         if (ret >= 0)
 137                 return;
 138 err:
 139         btr_remove_node(rn->btrn);
 140         t->error = ret;
 141 }
 142
 143 static void http_recv_close(struct receiver_node *rn)
 144 {
 145         struct private_http_recv_data *phd = rn->private_data;
 146
 147         close(phd->fd);
 148         btr_pool_free(phd->btrp);
 149         free(rn->private_data);
 150 }
 151
 152 static void *http_recv_parse_config(int argc, char **argv)
 153 {
 154         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 155
 156         if (!http_recv_cmdline_parser(argc, argv, tmp))
 157                 return tmp;
 158         free(tmp);
 159         return NULL;
 160 }
 161
 162 static int http_recv_open(struct receiver_node *rn)
 163 {
 164         struct private_http_recv_data *phd;
 165         struct http_recv_args_info *conf = rn->conf;
 166         int fd, ret = para_connect_simple(IPPROTO_TCP, conf->host_arg,
 167                                                        conf->port_arg);
 168
 169         if (ret < 0)
 170                 return ret;
 171         fd = ret;
 172         ret = mark_fd_nonblocking(fd);
 173         if (ret < 0) {
 174                 close(fd);
 175                 return ret;
 176         }
 177         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 178         phd->fd = fd;
 179         phd->status = HTTP_CONNECTED;
 180         phd->btrp = btr_pool_new("http_recv", 320 * 1024);
 181         return 1;
 182 }
 183
 184 static void http_recv_free_config(void *conf)
 185 {
 186         http_recv_cmdline_parser_free(conf);
 187         free(conf);
 188 }
 189
 190 /**
 191  * The init function of the http receiver.
 192  *
 193  * \param r Pointer to the receiver struct to initialize.
 194  *
 195  * This initializes all function pointers of \a r.
 196  */
 197 void http_recv_init(struct receiver *r)
 198 {
 199         struct http_recv_args_info dummy;
 200
 201         http_recv_cmdline_parser_init(&dummy);
 202         r->open = http_recv_open;
 203         r->close = http_recv_close;
 204         r->pre_select = http_recv_pre_select;
 205         r->post_select = http_recv_post_select;
 206         r->parse_config = http_recv_parse_config;
 207         r->free_config = http_recv_free_config;
 208         r->help = (struct ggo_help) {
 209                 .short_help = http_recv_args_info_help,
 210                 .detailed_help = http_recv_args_info_detailed_help
 211         };
 212         http_recv_cmdline_parser_free(&dummy);
 213 }