dccp_recv.c

   1 /*
   2  * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file dccp_recv.c paraslash's dccp receiver */
  20
  21 /*
  22  * based on client.c of dccp-cs-0.01.tar.bz2,
  23  * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
  24  */
  25
  26 #include "para.h"
  27 #include "error.h"
  28 #include "dccp.h"
  29 #include "list.h"
  30 #include "sched.h"
  31 #include "recv.h"
  32 #include "string.h"
  33 #include "net.h"
  34 #include "fd.h"
  35
  36 #include "dccp_recv.cmdline.h"
  37
  38 /* needed by getaddrinfo */
  39 #include <sys/types.h>
  40 #include <sys/socket.h>
  41 #include <netdb.h>
  42
  43 /** the size of the output buffer */
  44 #define DCCP_BUFSIZE 40960
  45
  46 /**
  47  * data specific to the dccp receiver
  48  *
  49  * \sa receiver receiver_node
  50  */
  51 struct private_dccp_recv_data {
  52         /** the file descriptor for the dccp socket */
  53         int fd;
  54 };
  55
  56
  57 static void dccp_recv_close(struct receiver_node *rn)
  58 {
  59
  60         struct private_dccp_recv_data *pdd = rn->private_data;
  61
  62         if (pdd && pdd->fd > 0)
  63                 close(pdd->fd);
  64         free(rn->buf);
  65         rn->buf = NULL;
  66         free(rn->private_data);
  67         rn->private_data = NULL;
  68 }
  69
  70
  71 static int dccp_recv_open(struct receiver_node *rn)
  72 {
  73         struct private_dccp_recv_data *pdd;
  74         struct dccp_recv_args_info *conf = rn->conf;
  75         int ret;
  76         struct addrinfo *ai;
  77         char *tmp;
  78
  79         rn->buf = para_calloc(DCCP_BUFSIZE);
  80         rn->private_data = para_calloc(sizeof(struct private_dccp_recv_data));
  81         pdd = rn->private_data;
  82         ret = dccp_get_socket();
  83         if (ret < 0)
  84                 goto err_out;
  85         pdd->fd = ret;
  86
  87         tmp = make_message("%d", conf->port_arg);
  88         ret = getaddrinfo(conf->host_arg, tmp, NULL, &ai);
  89         free(tmp);
  90         if (ret) {
  91                 ret = -E_ADDR_INFO;
  92                 goto err_out;
  93         }
  94         ret = dccp_set_socket(pdd->fd);
  95         if (ret < 0)
  96                 goto err_out;
  97         PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg, conf->port_arg);
  98         ret = -E_DCCP_CONNECT;
  99         if (connect(pdd->fd, ai->ai_addr, ai->ai_addrlen) < 0)
 100                 goto err_out;
 101         return 1;
 102 err_out:
 103         dccp_recv_close(rn);
 104         return ret;
 105 }
 106
 107 static void dccp_shutdown(void)
 108 {
 109         ; /* nothing to do */
 110 }
 111
 112 static void *dccp_recv_parse_config(int argc, char **argv)
 113 {
 114         struct dccp_recv_args_info *tmp = para_calloc(sizeof(struct dccp_recv_args_info));
 115
 116         if (!dccp_recv_cmdline_parser(argc, argv, tmp))
 117                 return tmp;
 118         free(tmp);
 119         return NULL;
 120 }
 121
 122 static void dccp_recv_pre_select(struct sched *s, struct task *t)
 123 {
 124         struct receiver_node *rn = t->private_data;
 125         struct private_dccp_recv_data *pdd = rn->private_data;
 126
 127         t->ret = 1;
 128         para_fd_set(pdd->fd, &s->rfds, &s->max_fileno);
 129 }
 130
 131 static void dccp_recv_post_select(struct sched *s, struct task *t)
 132 {
 133         struct receiver_node *rn = t->private_data;
 134         struct private_dccp_recv_data *pdd = rn->private_data;
 135
 136         t->ret = -E_DCCP_RECV_EOF;
 137         if (rn->output_eof && *rn->output_eof)
 138                 goto out;
 139         t->ret = 1;
 140         if (!s->select_ret || !FD_ISSET(pdd->fd, &s->rfds))
 141                 goto out; /* nothing to do */
 142         t->ret = -E_DCCP_OVERRUN;
 143         if (rn->loaded >= DCCP_BUFSIZE)
 144                 goto out;
 145         t->ret = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
 146                 DCCP_BUFSIZE - rn->loaded);
 147         if (t->ret <= 0) {
 148                 if (!t->ret)
 149                         t->ret = -E_DCCP_RECV_EOF;
 150                 goto out;
 151         }
 152         rn->loaded += t->ret;
 153         return;
 154 out:
 155         if (t->ret < 0)
 156                 rn->eof = 1;
 157 }
 158
 159 /**
 160  * the init function of the dccp receiver
 161  *
 162  * \param r pointer to the receiver struct to initialize
 163  *
 164  * Initialize all function pointers of \a r
 165  */
 166 void dccp_recv_init(struct receiver *r)
 167 {
 168         r->shutdown = dccp_shutdown;
 169         r->open = dccp_recv_open;
 170         r->close = dccp_recv_close;
 171         r->pre_select = dccp_recv_pre_select;
 172         r->post_select = dccp_recv_post_select;
 173         r->parse_config = dccp_recv_parse_config;
 174 }