http_recv.c

   1 /*
   2  * Copyright (C) 2005-2014 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 <netinet/in.h>
  11 #include <sys/socket.h>
  12 #include <sys/types.h>
  13 #include <arpa/inet.h>
  14 #include <sys/un.h>
  15 #include <netdb.h>
  16
  17 #include "para.h"
  18 #include "error.h"
  19 #include "http.h"
  20 #include "list.h"
  21 #include "sched.h"
  22 #include "ggo.h"
  23 #include "buffer_tree.h"
  24 #include "recv.h"
  25 #include "http_recv.cmdline.h"
  26 #include "net.h"
  27 #include "string.h"
  28 #include "fd.h"
  29
  30 /**
  31  * the possible states of a http receiver node
  32  *
  33  * \sa receiver_node
  34  */
  35 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
  36
  37 /**
  38  * Data specific to the http receiver.
  39  *
  40  * Each running instance of the http receiver reserves space for one such struct.
  41  */
  42 struct private_http_recv_data {
  43         /**
  44          * The current status of the http receiver node.
  45          *
  46          * It gets initialized to \p HTTP_CONNECTED by the open function of the
  47          * http receiver.
  48          *
  49          * \sa receiver::open, receiver_node.
  50          */
  51         enum http_recv_status status;
  52 };
  53
  54 static char *make_request_msg(void)
  55 {
  56         char *ret, *hn = para_hostname();
  57         ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
  58                 HTTP_GET_MSG, hn, PACKAGE_VERSION);
  59         free(hn);
  60         return ret;
  61 }
  62
  63 static void http_recv_pre_select(struct sched *s, void *context)
  64 {
  65         struct receiver_node *rn = context;
  66         struct private_http_recv_data *phd = rn->private_data;
  67
  68         if (generic_recv_pre_select(s, rn) <= 0)
  69                 return;
  70         if  (phd->status == HTTP_CONNECTED)
  71                 para_fd_set(rn->fd, &s->wfds, &s->max_fileno);
  72         else
  73                 para_fd_set(rn->fd, &s->rfds, &s->max_fileno);
  74 }
  75
  76 /*
  77  * Establish the http connection. If already established, fill the buffer pool
  78  * area with data read from the socket. In any case, update the state of the
  79  * connection if necessary.
  80  */
  81 static int http_recv_post_select(struct sched *s, void *context)
  82 {
  83         struct receiver_node *rn = context;
  84         struct private_http_recv_data *phd = rn->private_data;
  85         struct btr_node *btrn = rn->btrn;
  86         int ret, iovcnt;
  87         struct iovec iov[2];
  88         size_t num_bytes;
  89
  90         ret = task_get_notification(rn->task);
  91         if (ret < 0)
  92                 goto out;
  93         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
  94         if (ret < 0)
  95                 goto out;
  96         if (ret == 0)
  97                 return 0;
  98         if (phd->status == HTTP_CONNECTED) {
  99                 char *rq;
 100                 if (!FD_ISSET(rn->fd, &s->wfds))
 101                         return 0;
 102                 rq = make_request_msg();
 103                 PARA_INFO_LOG("sending http request\n");
 104                 ret = write_va_buffer(rn->fd, "%s", rq);
 105                 free(rq);
 106                 if (ret < 0)
 107                         goto out;
 108                 phd->status = HTTP_SENT_GET_REQUEST;
 109                 return 0;
 110         }
 111         if (phd->status == HTTP_SENT_GET_REQUEST) {
 112                 ret = read_pattern(rn->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG), &s->rfds);
 113                 if (ret < 0)
 114                         goto out;
 115                 if (ret == 0)
 116                         return 0;
 117                 PARA_INFO_LOG("received ok msg, streaming\n");
 118                 phd->status = HTTP_STREAMING;
 119                 return 0;
 120         }
 121         ret = -E_HTTP_RECV_OVERRUN;
 122         iovcnt = btr_pool_get_buffers(rn->btrp, iov);
 123         if (iovcnt == 0)
 124                 goto out;
 125         ret = readv_nonblock(rn->fd, iov, iovcnt, &s->rfds, &num_bytes);
 126         if (num_bytes == 0)
 127                 goto out;
 128         if (num_bytes <= iov[0].iov_len) /* only the first buffer was filled */
 129                 btr_add_output_pool(rn->btrp, num_bytes, btrn);
 130         else { /* both buffers contain data */
 131                 btr_add_output_pool(rn->btrp, iov[0].iov_len, btrn);
 132                 btr_add_output_pool(rn->btrp, num_bytes - iov[0].iov_len, btrn);
 133         }
 134 out:
 135         if (ret < 0)
 136                 btr_remove_node(&rn->btrn);
 137         return ret;
 138 }
 139
 140 static void http_recv_close(struct receiver_node *rn)
 141 {
 142         close(rn->fd);
 143         btr_pool_free(rn->btrp);
 144         free(rn->private_data);
 145 }
 146
 147 static void *http_recv_parse_config(int argc, char **argv)
 148 {
 149         struct http_recv_args_info *tmp = para_calloc(sizeof(*tmp));
 150
 151         http_recv_cmdline_parser(argc, argv, tmp);
 152         return tmp;
 153 }
 154
 155 static int http_recv_open(struct receiver_node *rn)
 156 {
 157         struct private_http_recv_data *phd;
 158         struct http_recv_args_info *conf = rn->conf;
 159         int fd, ret = para_connect_simple(IPPROTO_TCP, conf->host_arg,
 160                                                        conf->port_arg);
 161
 162         if (ret < 0)
 163                 return ret;
 164         fd = ret;
 165         ret = mark_fd_nonblocking(fd);
 166         if (ret < 0) {
 167                 close(fd);
 168                 return ret;
 169         }
 170         rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
 171         rn->fd = fd;
 172         phd->status = HTTP_CONNECTED;
 173         rn->btrp = btr_pool_new("http_recv", 320 * 1024);
 174         return 1;
 175 }
 176
 177 static void http_recv_free_config(void *conf)
 178 {
 179         http_recv_cmdline_parser_free(conf);
 180         free(conf);
 181 }
 182
 183 /**
 184  * The init function of the http receiver.
 185  *
 186  * \param r Pointer to the receiver struct to initialize.
 187  *
 188  * This initializes all function pointers of \a r.
 189  */
 190 void http_recv_init(struct receiver *r)
 191 {
 192         struct http_recv_args_info dummy;
 193
 194         http_recv_cmdline_parser_init(&dummy);
 195         r->open = http_recv_open;
 196         r->close = http_recv_close;
 197         r->pre_select = http_recv_pre_select;
 198         r->post_select = http_recv_post_select;
 199         r->parse_config = http_recv_parse_config;
 200         r->free_config = http_recv_free_config;
 201         r->help = (struct ggo_help)DEFINE_GGO_HELP(http_recv);
 202         http_recv_cmdline_parser_free(&dummy);
 203 }