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 /*
  20  * based on client.c of dccp-cs-0.01.tar.bz2,
  21  * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
  22  */
  23
  24 #include "para.h"
  25 #include "error.h"
  26 #include "dccp.h"
  27 #include "recv.h"
  28 #include "string.h"
  29 #include "net.h"
  30
  31 #include "dccp_recv.cmdline.h"
  32
  33 /* needed by getaddrinfo */
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36 #include <netdb.h>
  37
  38
  39 #define DCCP_BUFSIZE 4096
  40
  41 /**
  42  * data specific to the dccp receiver
  43  *
  44  * \sa receiver receiver_node
  45  */
  46 struct private_dccp_recv_data {
  47         /** the file descriptor for the dccp socket */
  48         int fd;
  49 };
  50
  51
  52 static void dccp_recv_close(struct receiver_node *rn)
  53 {
  54
  55         struct private_dccp_recv_data *pdd = rn->private_data;
  56
  57         if (pdd && pdd->fd > 0)
  58                 close(pdd->fd);
  59         free(rn->buf);
  60         rn->buf = NULL;
  61         free(rn->private_data);
  62         rn->private_data = NULL;
  63 }
  64
  65
  66 static int dccp_recv_open(struct receiver_node *rn)
  67 {
  68         struct private_dccp_recv_data *pdd;
  69         struct gengetopt_args_info *conf = rn->conf;
  70         int ret;
  71         struct addrinfo *ai;
  72         char *tmp;
  73
  74         rn->buf = para_calloc(DCCP_BUFSIZE);
  75         rn->private_data = para_calloc(sizeof(struct private_dccp_recv_data));
  76         pdd = rn->private_data;
  77         ret = dccp_get_socket();
  78         if (ret < 0)
  79                 goto err_out;
  80         pdd->fd = ret;
  81
  82         tmp = make_message("%d", conf->port_arg);
  83         ret = getaddrinfo(conf->host_arg, tmp, NULL, &ai);
  84         free(tmp);
  85         if (ret) {
  86                 ret = -E_ADDR_INFO;
  87                 goto err_out;
  88         }
  89         ret = dccp_set_socket(pdd->fd);
  90         if (ret < 0)
  91                 goto err_out;
  92         PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg, conf->port_arg);
  93         ret = -E_DCCP_CONNECT;
  94         if (connect(pdd->fd, ai->ai_addr, ai->ai_addrlen) < 0)
  95                 goto err_out;
  96         return 1;
  97 err_out:
  98         dccp_recv_close(rn);
  99         return ret;
 100 }
 101
 102 static void dccp_shutdown(void)
 103 {
 104         ; /* nothing to do */
 105 }
 106
 107 static void *dccp_recv_parse_config(int argc, char **argv)
 108 {
 109         struct gengetopt_args_info *tmp = para_calloc(sizeof(struct gengetopt_args_info));
 110
 111         if (!dccp_recv_cmdline_parser(argc, argv, tmp))
 112                 return tmp;
 113         free(tmp);
 114         return NULL;
 115 }
 116
 117 static int dccp_recv_pre_select(struct receiver_node *rn, fd_set *rfds,
 118                 __unused fd_set *wfds, __unused struct timeval *timeout)
 119 {
 120         struct private_dccp_recv_data *pdd = rn->private_data;
 121
 122         if (!pdd)
 123                 return -1;
 124         FD_SET(pdd->fd, rfds);
 125         return pdd->fd;
 126 }
 127
 128 static int dccp_recv_post_select(struct receiver_node *rn, int select_ret,
 129                 fd_set *rfds, __unused fd_set *wfds)
 130 {
 131         int ret;
 132         struct private_dccp_recv_data *pdd = rn->private_data;
 133
 134         if (!select_ret || !pdd || !FD_ISSET(pdd->fd, rfds))
 135                 return 1; /* nothing to do */
 136         if (rn->loaded >= DCCP_BUFSIZE)
 137                 return -E_DCCP_OVERRUN;
 138         ret = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
 139                 DCCP_BUFSIZE - rn->loaded);
 140         if (ret <= 0) {
 141                 PARA_INFO_LOG("%s\n", ret? PARA_STRERROR(-ret) : "eof");
 142                 return ret;
 143         }
 144         rn->loaded += ret;
 145         return 1;
 146 }
 147
 148 /**
 149  * the init function of the dccp receiver
 150  *
 151  * \param r pointer to the receiver struct to initialize
 152  *
 153  * Initialize all function pointers of \a r
 154  */
 155 void dccp_recv_init(struct receiver *r)
 156 {
 157         r->shutdown = dccp_shutdown;
 158         r->open = dccp_recv_open;
 159         r->close = dccp_recv_close;
 160         r->pre_select = dccp_recv_pre_select;
 161         r->post_select = dccp_recv_post_select;
 162         r->parse_config = dccp_recv_parse_config;
 163 }