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         int ret;
  85
  86         if (rn->btrn) {
  87                 ret = generic_recv_pre_select(s, t);
  88                 if (ret <= 0)
  89                         return;
  90         }
  91         t->error = 0;
  92         if  (phd->status == HTTP_CONNECTED)
  93                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
  94         else
  95                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
  96 }
  97
  98 static void http_recv_post_select(struct sched *s, struct task *t)
  99 {
 100         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 101         struct private_http_recv_data *phd = rn->private_data;
 102         struct btr_node *btrn = rn->btrn;
 103         int ret;
 104
 105         t->error = 0;
 106         if (btrn) {
 107                 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 108                 if (ret < 0)
 109                         goto err;
 110                 if (ret == 0)
 111                         return;
 112         } else {
 113                 if (rn->output_error && *rn->output_error < 0) {
 114                         ret = *rn->output_error;
 115                         goto err;
 116                 }
 117         }
 118         if (phd->status == HTTP_CONNECTED) {
 119                 char *rq;
 120                 if (!FD_ISSET(phd->fd, &s->wfds))
 121                         return;
 122                 rq = make_request_msg();
 123                 PARA_INFO_LOG("sending http request\n");
 124                 ret = send_va_buffer(phd->fd, "%s", rq);
 125                 free(rq);
 126                 if (ret < 0)
 127                         goto err;
 128                 phd->status = HTTP_SENT_GET_REQUEST;
 129                 return;
 130         }
 131         if (!FD_ISSET(phd->fd, &s->rfds))
 132                 return;
 133         if (phd->status == HTTP_SENT_GET_REQUEST) {
 134                 ret = recv_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG));
 135                 if (ret < 0)
 136                         goto err;
 137                 PARA_INFO_LOG("received ok msg, streaming\n");
 138                 phd->status = HTTP_STREAMING;
 139                 return;
 140         }
 141         if (btrn) {
 142                 char *buf;
 143                 size_t sz;
 144
 145                 sz = btr_pool_get_buffer(phd->btrp, &buf);
 146                 //PARA_CRIT_LOG("max buffer %p: %zu\n", buf, sz);
 147                 ret = -E_HTTP_RECV_OVERRUN;
 148                 if (sz == 0)
 149                         goto err;
 150                 //buf = para_malloc(HTTP_RECV_READ_BUF_SIZE);
 151                 //sz = HTTP_RECV_READ_BUF_SIZE;
 152                 ret = recv_bin_buffer(phd->fd, buf, sz);
 153                 if (ret == 0)
 154                         ret = -E_RECV_EOF;
 155                 if (ret < 0)
 156                         goto err;
 157                 btr_add_output_pool(phd->btrp, ret, btrn);
 158                 return;
 159         }
 160         ret = -E_HTTP_RECV_OVERRUN;
 161         if (rn->loaded >= BUFSIZE)
 162                 goto err;
 163         ret = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
 164                 BUFSIZE - rn->loaded);
 165         if (ret == 0)
 166                 ret = -E_RECV_EOF;
 167         if (ret < 0)
 168                 goto err;
 169         rn->loaded += ret;
 170         return;
 171 err:
 172         if (btrn)
 173                 btr_remove_node(rn->btrn);
 174         t->error = ret;
 175 }
 176
 177 static void http_recv_close(struct receiver_node *rn)
 178 {
 179         struct private_http_recv_data *phd = rn->private_data;
 180
 181         close(phd->fd);
 182         btr_pool_free(phd->btrp);
 183         free(rn->buf);
 184         free(rn->private_data);
 185 }
 186
 187 static void *http_recv_parse_config(int argc, char **argv)
 188 {
 189         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 190
 191         if (!http_recv_cmdline_parser(argc, argv, tmp))
 192                 return tmp;
 193         free(tmp);
 194         return NULL;
 195 }
 196
 197 static int http_recv_open(struct receiver_node *rn)
 198 {
 199         struct private_http_recv_data *phd;
 200         struct http_recv_args_info *conf = rn->conf;
 201         int fd, ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg,
 202                 conf->port_arg);
 203
 204         if (ret < 0)
 205                 return ret;
 206         fd = ret;
 207         ret = mark_fd_nonblocking(fd);
 208         if (ret < 0) {
 209                 close(fd);
 210                 return ret;
 211         }
 212         rn->buf = para_calloc(BUFSIZE);
 213         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 214         phd->fd = fd;
 215         phd->status = HTTP_CONNECTED;
 216         phd->btrp = btr_pool_new("http_recv", 320 * 1024);
 217         return 1;
 218 }
 219
 220 static void http_recv_free_config(void *conf)
 221 {
 222         http_recv_cmdline_parser_free(conf);
 223 }
 224
 225 /**
 226  * The init function of the http receiver.
 227  *
 228  * \param r Pointer to the receiver struct to initialize.
 229  *
 230  * This initializes all function pointers of \a r.
 231  */
 232 void http_recv_init(struct receiver *r)
 233 {
 234         struct http_recv_args_info dummy;
 235
 236         http_recv_cmdline_parser_init(&dummy);
 237         r->open = http_recv_open;
 238         r->close = http_recv_close;
 239         r->pre_select = http_recv_pre_select;
 240         r->post_select = http_recv_post_select;
 241         r->parse_config = http_recv_parse_config;
 242         r->free_config = http_recv_free_config;
 243         r->help = (struct ggo_help) {
 244                 .short_help = http_recv_args_info_help,
 245                 .detailed_help = http_recv_args_info_detailed_help
 246         };
 247         http_recv_cmdline_parser_free(&dummy);
 248 }