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 #include "buffer_tree.h"
  25
  26 /** the output buffer size of the http receiver */
  27 #define BUFSIZE (32 * 1024)
  28
  29 /**
  30  * the possible states of a http receiver node
  31  *
  32  * \sa receiver_node
  33  */
  34 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
  35
  36 /**
  37  * Data specific to the http receiver.
  38  *
  39  * Each running instance of the http receiver reserves space for one such struct.
  40  */
  41 struct private_http_recv_data {
  42         /**
  43          * The current status of the http receiver node.
  44          *
  45          * It gets initialized to \p HTTP_CONNECTED by the open function of the
  46          * http receiver.
  47          *
  48          * \sa receiver::open, receiver_node.
  49          */
  50         enum http_recv_status status;
  51         /**
  52          * The file descriptor used for receiving the http stream.
  53          *
  54          * The pre_select function of the http receiver adds this file descriptor to
  55          * the set of file decriptors which are checked for reading/writing (depending
  56          * on the current status) by the select loop of the application (para_audiod or
  57          * para_recv).
  58          *
  59          * The post_select function of the http receiver uses \a fd, if ready, to
  60          * establish the http connection, and updates \a status according to the new
  61          * state of the connection.  As soon as \a status is \p HTTP_STREAMING, \a fd is
  62          * going to be only checked for reading. If data is available, it is read into
  63          * the output buffer of the receiver node by post_select.
  64          *
  65          * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
  66          */
  67         int fd;
  68         struct btr_pool *btrp;
  69 };
  70
  71 static char *make_request_msg(void)
  72 {
  73         char *ret, *hn = para_hostname();
  74         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  75                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  76         free(hn);
  77         return ret;
  78 }
  79
  80 static void http_recv_pre_select(struct sched *s, struct task *t)
  81 {
  82         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  83         struct private_http_recv_data *phd = rn->private_data;
  84
  85         t->error = 0;
  86         if (generic_recv_pre_select(s, t) <= 0)
  87                 return;
  88         if  (phd->status == HTTP_CONNECTED)
  89                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
  90         else
  91                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
  92 }
  93
  94 static void http_recv_post_select(struct sched *s, struct task *t)
  95 {
  96         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  97         struct private_http_recv_data *phd = rn->private_data;
  98         struct btr_node *btrn = rn->btrn;
  99         int ret;
 100         char *buf;
 101         size_t sz;
 102
 103         t->error = 0;
 104         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 105         if (ret < 0)
 106                 goto err;
 107         if (ret == 0)
 108                 return;
 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                 ret = send_va_buffer(phd->fd, "%s", rq);
 116                 free(rq);
 117                 if (ret < 0)
 118                         goto err;
 119                 phd->status = HTTP_SENT_GET_REQUEST;
 120                 return;
 121         }
 122         if (!FD_ISSET(phd->fd, &s->rfds))
 123                 return;
 124         if (phd->status == HTTP_SENT_GET_REQUEST) {
 125                 ret = recv_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG));
 126                 if (ret < 0)
 127                         goto err;
 128                 PARA_INFO_LOG("received ok msg, streaming\n");
 129                 phd->status = HTTP_STREAMING;
 130                 return;
 131         }
 132         ret = -E_HTTP_RECV_OVERRUN;
 133         sz = btr_pool_get_buffer(phd->btrp, &buf);
 134         if (sz == 0)
 135                 goto err;
 136         ret = recv_bin_buffer(phd->fd, buf, sz);
 137         if (ret == 0)
 138                 ret = -E_RECV_EOF;
 139         if (ret < 0)
 140                 goto err;
 141         btr_add_output_pool(phd->btrp, ret, btrn);
 142         return;
 143 err:
 144         btr_remove_node(rn->btrn);
 145         t->error = ret;
 146 }
 147
 148 static void http_recv_close(struct receiver_node *rn)
 149 {
 150         struct private_http_recv_data *phd = rn->private_data;
 151
 152         close(phd->fd);
 153         btr_pool_free(phd->btrp);
 154         free(rn->buf);
 155         free(rn->private_data);
 156 }
 157
 158 static void *http_recv_parse_config(int argc, char **argv)
 159 {
 160         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 161
 162         if (!http_recv_cmdline_parser(argc, argv, tmp))
 163                 return tmp;
 164         free(tmp);
 165         return NULL;
 166 }
 167
 168 static int http_recv_open(struct receiver_node *rn)
 169 {
 170         struct private_http_recv_data *phd;
 171         struct http_recv_args_info *conf = rn->conf;
 172         int fd, ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg,
 173                 conf->port_arg);
 174
 175         if (ret < 0)
 176                 return ret;
 177         fd = ret;
 178         ret = mark_fd_nonblocking(fd);
 179         if (ret < 0) {
 180                 close(fd);
 181                 return ret;
 182         }
 183         rn->buf = para_calloc(BUFSIZE);
 184         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 185         phd->fd = fd;
 186         phd->status = HTTP_CONNECTED;
 187         phd->btrp = btr_pool_new("http_recv", 320 * 1024);
 188         return 1;
 189 }
 190
 191 static void http_recv_free_config(void *conf)
 192 {
 193         http_recv_cmdline_parser_free(conf);
 194 }
 195
 196 /**
 197  * The init function of the http receiver.
 198  *
 199  * \param r Pointer to the receiver struct to initialize.
 200  *
 201  * This initializes all function pointers of \a r.
 202  */
 203 void http_recv_init(struct receiver *r)
 204 {
 205         struct http_recv_args_info dummy;
 206
 207         http_recv_cmdline_parser_init(&dummy);
 208         r->open = http_recv_open;
 209         r->close = http_recv_close;
 210         r->pre_select = http_recv_pre_select;
 211         r->post_select = http_recv_post_select;
 212         r->parse_config = http_recv_parse_config;
 213         r->free_config = http_recv_free_config;
 214         r->help = (struct ggo_help) {
 215                 .short_help = http_recv_args_info_help,
 216                 .detailed_help = http_recv_args_info_detailed_help
 217         };
 218         http_recv_cmdline_parser_free(&dummy);
 219 }