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 void http_shutdown(void)
  72 {
  73         return;
  74 }
  75
  76 static char *make_request_msg(void)
  77 {
  78         char *ret, *hn = para_hostname();
  79         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  80                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  81         free(hn);
  82         return ret;
  83 }
  84
  85 static void http_recv_pre_select(struct sched *s, struct task *t)
  86 {
  87         struct receiver_node *rn = container_of(t, struct receiver_node, task);
  88         struct private_http_recv_data *phd = rn->private_data;
  89         int ret;
  90
  91         if (rn->btrn) {
  92                 ret = generic_recv_pre_select(s, t);
  93                 if (ret <= 0)
  94                         return;
  95         }
  96         t->error = 0;
  97         if  (phd->status == HTTP_CONNECTED)
  98                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
  99         else
 100                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
 101 }
 102
 103 static void http_recv_post_select(struct sched *s, struct task *t)
 104 {
 105         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 106         struct private_http_recv_data *phd = rn->private_data;
 107         struct btr_node *btrn = rn->btrn;
 108         int ret;
 109
 110         t->error = 0;
 111         if (btrn) {
 112                 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 113                 if (ret < 0)
 114                         goto err;
 115                 if (ret == 0)
 116                         return;
 117         } else {
 118                 if (rn->output_error && *rn->output_error < 0) {
 119                         ret = *rn->output_error;
 120                         goto err;
 121                 }
 122         }
 123         if (phd->status == HTTP_CONNECTED) {
 124                 char *rq;
 125                 if (!FD_ISSET(phd->fd, &s->wfds))
 126                         return;
 127                 rq = make_request_msg();
 128                 PARA_INFO_LOG("sending http request\n");
 129                 ret = send_va_buffer(phd->fd, "%s", rq);
 130                 free(rq);
 131                 if (ret < 0)
 132                         goto err;
 133                 phd->status = HTTP_SENT_GET_REQUEST;
 134                 return;
 135         }
 136         if (!FD_ISSET(phd->fd, &s->rfds))
 137                 return;
 138         if (phd->status == HTTP_SENT_GET_REQUEST) {
 139                 ret = recv_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG));
 140                 if (ret < 0)
 141                         goto err;
 142                 PARA_INFO_LOG("received ok msg, streaming\n");
 143                 phd->status = HTTP_STREAMING;
 144                 return;
 145         }
 146         if (btrn) {
 147                 char *buf;
 148                 size_t sz;
 149
 150                 sz = btr_pool_get_buffer(phd->btrp, &buf);
 151                 //PARA_CRIT_LOG("max buffer %p: %zu\n", buf, sz);
 152                 ret = -E_HTTP_RECV_OVERRUN;
 153                 if (sz == 0)
 154                         goto err;
 155                 //buf = para_malloc(HTTP_RECV_READ_BUF_SIZE);
 156                 //sz = HTTP_RECV_READ_BUF_SIZE;
 157                 ret = recv_bin_buffer(phd->fd, buf, sz);
 158                 if (ret == 0)
 159                         ret = -E_RECV_EOF;
 160                 if (ret < 0)
 161                         goto err;
 162                 btr_add_output_pool(phd->btrp, ret, btrn);
 163                 return;
 164         }
 165         ret = -E_HTTP_RECV_OVERRUN;
 166         if (rn->loaded >= BUFSIZE)
 167                 goto err;
 168         ret = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
 169                 BUFSIZE - rn->loaded);
 170         if (ret == 0)
 171                 ret = -E_RECV_EOF;
 172         if (ret < 0)
 173                 goto err;
 174         rn->loaded += ret;
 175         return;
 176 err:
 177         if (btrn)
 178                 btr_remove_node(rn->btrn);
 179         t->error = ret;
 180 }
 181
 182 static void http_recv_close(struct receiver_node *rn)
 183 {
 184         struct private_http_recv_data *phd = rn->private_data;
 185
 186         close(phd->fd);
 187         btr_pool_free(phd->btrp);
 188         free(rn->buf);
 189         free(rn->private_data);
 190 }
 191
 192 static void *http_recv_parse_config(int argc, char **argv)
 193 {
 194         struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
 195
 196         if (!http_recv_cmdline_parser(argc, argv, tmp))
 197                 return tmp;
 198         free(tmp);
 199         return NULL;
 200 }
 201
 202 static int http_recv_open(struct receiver_node *rn)
 203 {
 204         struct private_http_recv_data *phd;
 205         struct http_recv_args_info *conf = rn->conf;
 206         int fd, ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg,
 207                 conf->port_arg);
 208
 209         if (ret < 0)
 210                 return ret;
 211         fd = ret;
 212         ret = mark_fd_nonblocking(fd);
 213         if (ret < 0) {
 214                 close(fd);
 215                 return ret;
 216         }
 217         rn->buf = para_calloc(BUFSIZE);
 218         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 219         phd->fd = fd;
 220         phd->status = HTTP_CONNECTED;
 221         phd->btrp = btr_pool_new("http_recv", 320 * 1024);
 222         return 1;
 223 }
 224
 225 static void http_recv_free_config(void *conf)
 226 {
 227         http_recv_cmdline_parser_free(conf);
 228 }
 229
 230 /**
 231  * The init function of the http receiver.
 232  *
 233  * \param r Pointer to the receiver struct to initialize.
 234  *
 235  * This initializes all function pointers of \a r.
 236  */
 237 void http_recv_init(struct receiver *r)
 238 {
 239         struct http_recv_args_info dummy;
 240
 241         http_recv_cmdline_parser_init(&dummy);
 242         r->open = http_recv_open;
 243         r->close = http_recv_close;
 244         r->pre_select = http_recv_pre_select;
 245         r->post_select = http_recv_post_select;
 246         r->shutdown = http_shutdown;
 247         r->parse_config = http_recv_parse_config;
 248         r->free_config = http_recv_free_config;
 249         r->help = (struct ggo_help) {
 250                 .short_help = http_recv_args_info_help,
 251                 .detailed_help = http_recv_args_info_detailed_help
 252         };
 253         http_recv_cmdline_parser_free(&dummy);
 254 }