http_recv.c

   1 /*
   2  * Copyright (C) 2005-2008 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 <sys/types.h>
  10 #include <dirent.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "http.h"
  15 #include "list.h"
  16 #include "sched.h"
  17 #include "recv.h"
  18 #include "http_recv.cmdline.h"
  19 #include "net.h"
  20 #include "string.h"
  21 #include "fd.h"
  22
  23 /** the output buffer size of the http receiver */
  24 #define BUFSIZE (32 * 1024)
  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  *
  41  *
  42  * the current status of the http receiver node
  43  *
  44  * It gets initialized to \p HTTP_CONNECTED by the open function of the
  45  * http receiver.
  46  *
  47  * \sa receiver::open, receiver_node.
  48  */
  49         enum http_recv_status status;
  50 /**
  51  *
  52  *
  53  * the file descriptor used for receiving the http stream
  54  *
  55  * The pre_select function of the http receiver adds this file descriptor to
  56  * the set of file decriptors which are checked for reading/writing (depending
  57  * on the current status) by the select loop of the application (para_audiod or
  58  * para_recv).
  59  *
  60  * The post_select function of the http receiver uses \a fd, if ready, to
  61  * establish the http connection, and updates \a status according to the new
  62  * state of the connection.  As soon as \a status is \p HTTP_STREAMING, \a fd is
  63  * going to be only checked for reading. If data is available, it is read into
  64  * the output buffer of the receiver node by post_select.
  65  *
  66  * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
  67  */
  68         int fd;
  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
  90         t->error = 0;
  91         if  (phd->status == HTTP_CONNECTED)
  92                 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
  93         else
  94                 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
  95 }
  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
 103         if (rn->output_error && *rn->output_error < 0) {
 104                 t->error = *rn->output_error;
 105                 return;
 106         }
 107         if  (phd->status == HTTP_CONNECTED) {
 108                 char *rq;
 109                 if (!FD_ISSET(phd->fd, &s->wfds))
 110                         return;
 111                 rq = make_request_msg();
 112                 PARA_INFO_LOG("sending http request\n");
 113                 t->error = send_va_buffer(phd->fd, "%s", rq);
 114                 free(rq);
 115                 if (t->error >= 0)
 116                         phd->status = HTTP_SENT_GET_REQUEST;
 117                 return;
 118         }
 119         if (!FD_ISSET(phd->fd, &s->rfds))
 120                 return;
 121         if (phd->status == HTTP_SENT_GET_REQUEST) {
 122                 t->error = recv_pattern(phd->fd, HTTP_OK_MSG, MAXLINE);
 123                 if (t->error >= 0) {
 124                         PARA_INFO_LOG("received ok msg, streaming\n");
 125                         phd->status = HTTP_STREAMING;
 126                 }
 127                 return;
 128         }
 129         if (rn->loaded >= BUFSIZE) {
 130                 t->error = -E_HTTP_RECV_OVERRUN;
 131                 return;
 132         }
 133         t->error = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
 134                 BUFSIZE - rn->loaded);
 135         if (t->error > 0) {
 136                 rn->loaded += t->error;
 137                 return;
 138         }
 139         if (!t->error)
 140                 t->error = -E_RECV_EOF;
 141 }
 142
 143 static void http_recv_close(struct receiver_node *rn)
 144 {
 145         struct private_http_recv_data *phd = rn->private_data;
 146         close(phd->fd);
 147         free(rn->buf);
 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 = makesock(AF_UNSPEC, IPPROTO_TCP, 0, 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->buf = para_calloc(BUFSIZE);
 177         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 178         phd->fd = fd;
 179         phd->status = HTTP_CONNECTED;
 180         return 1;
 181 }
 182
 183 /**
 184  * the init function of the http receiver
 185  *
 186  * \param r pointer to the receiver struct to initialize
 187  *
 188  * Just initialize all function pointers of \a r.
 189  */
 190 void http_recv_init(struct receiver *r)
 191 {
 192         r->open = http_recv_open;
 193         r->close = http_recv_close;
 194         r->pre_select = http_recv_pre_select;
 195         r->post_select = http_recv_post_select;
 196         r->shutdown = http_shutdown;
 197         r->parse_config = http_recv_parse_config;
 198 }