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 #include "para.h"
  20 #include "error.h"
  21 #include "dccp.h"
  22 #include "recv.h"
  23 #include "string.h"
  24 #include "net.h"
  25
  26 #include "dccp_recv.cmdline.h"
  27
  28 /* needed by getaddrinfo */
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <netdb.h>
  32
  33
  34 #define DCCP_BUFSIZE 4096
  35
  36 /**
  37  * data specific to the dccp receiver
  38  *
  39  * \sa receiver receiver_node
  40  */
  41 struct private_dccp_recv_data {
  42         /** the file descriptor for the dccp socket */
  43         int fd;
  44 };
  45
  46
  47 static void dccp_recv_close(struct receiver_node *rn)
  48 {
  49
  50         struct private_dccp_recv_data *pdd = rn->private_data;
  51
  52         if (pdd && pdd->fd > 0)
  53                 close(pdd->fd);
  54         free(rn->buf);
  55         rn->buf = NULL;
  56         free(rn->private_data);
  57         rn->private_data = NULL;
  58 }
  59
  60
  61 static int dccp_recv_open(struct receiver_node *rn)
  62 {
  63         struct private_dccp_recv_data *pdd;
  64         struct gengetopt_args_info *conf = rn->conf;
  65         int ret;
  66         struct addrinfo *ai;
  67         char *tmp;
  68
  69         rn->buf = para_calloc(DCCP_BUFSIZE);
  70         rn->private_data = para_calloc(sizeof(struct private_dccp_recv_data));
  71         pdd = rn->private_data;
  72         ret = dccp_get_socket();
  73         if (ret < 0)
  74                 goto err_out;
  75         pdd->fd = ret;
  76
  77         tmp = make_message("%d", conf->port_arg);
  78         ret = getaddrinfo(conf->host_arg, tmp, NULL, &ai);
  79         free(tmp);
  80         if (ret) {
  81                 ret = -E_ADDR_INFO;
  82                 goto err_out;
  83         }
  84         ret = dccp_set_socket(pdd->fd);
  85         if (ret < 0)
  86                 goto err_out;
  87         PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg, conf->port_arg);
  88         ret = -E_DCCP_CONNECT;
  89         if (connect(pdd->fd, ai->ai_addr, ai->ai_addrlen) < 0)
  90                 goto err_out;
  91         return 1;
  92 err_out:
  93         dccp_recv_close(rn);
  94         return ret;
  95 }
  96
  97 static void dccp_shutdown(void)
  98 {
  99         ; /* nothing to do */
 100 }
 101
 102 static void *dccp_recv_parse_config(int argc, char **argv)
 103 {
 104         struct gengetopt_args_info *tmp = para_calloc(sizeof(struct gengetopt_args_info));
 105
 106         if (!dccp_recv_cmdline_parser(argc, argv, tmp))
 107                 return tmp;
 108         free(tmp);
 109         return NULL;
 110 }
 111
 112 static int dccp_recv_pre_select(struct receiver_node *rn, fd_set *rfds,
 113                 __unused fd_set *wfds, __unused struct timeval *timeout)
 114 {
 115         struct private_dccp_recv_data *pdd = rn->private_data;
 116
 117         if (pdd)
 118                 FD_SET(pdd->fd, rfds);
 119         return pdd->fd;
 120 }
 121
 122 static int dccp_recv_post_select(struct receiver_node *rn, int select_ret,
 123                 fd_set *rfds, __unused fd_set *wfds)
 124 {
 125         int ret;
 126         struct private_dccp_recv_data *pdd = rn->private_data;
 127
 128         if (!select_ret || !pdd || !FD_ISSET(pdd->fd, rfds))
 129                 return 1; /* nothing to do */
 130         if (rn->loaded >= DCCP_BUFSIZE)
 131                 return -E_DCCP_OVERRUN;
 132         ret = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
 133                 DCCP_BUFSIZE - rn->loaded);
 134         if (ret <= 0)
 135                 return ret;
 136         rn->loaded += ret;
 137         return 1;
 138 }
 139
 140 /**
 141  * the init function of the dccp receiver
 142  *
 143  * \param r pointer to the receiver struct to initialize
 144  *
 145  * Initialize all function pointers of \a r
 146  */
 147 void dccp_recv_init(struct receiver *r)
 148 {
 149         r->shutdown = dccp_shutdown;
 150         r->open = dccp_recv_open;
 151         r->close = dccp_recv_close;
 152         r->pre_select = dccp_recv_pre_select;
 153         r->post_select = dccp_recv_post_select;
 154         r->parse_config = dccp_recv_parse_config;
 155 }