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 "recv.h"
  30 #include "string.h"
  31 #include "net.h"
  32
  33 #include "dccp_recv.cmdline.h"
  34
  35 /* needed by getaddrinfo */
  36 #include <sys/types.h>
  37 #include <sys/socket.h>
  38 #include <netdb.h>
  39
  40 /** the size of the output buffer */
  41 #define DCCP_BUFSIZE 40960
  42
  43 /**
  44  * data specific to the dccp receiver
  45  *
  46  * \sa receiver receiver_node
  47  */
  48 struct private_dccp_recv_data {
  49         /** the file descriptor for the dccp socket */
  50         int fd;
  51 };
  52
  53
  54 static void dccp_recv_close(struct receiver_node *rn)
  55 {
  56
  57         struct private_dccp_recv_data *pdd = rn->private_data;
  58
  59         if (pdd && pdd->fd > 0)
  60                 close(pdd->fd);
  61         free(rn->buf);
  62         rn->buf = NULL;
  63         free(rn->private_data);
  64         rn->private_data = NULL;
  65 }
  66
  67
  68 static int dccp_recv_open(struct receiver_node *rn)
  69 {
  70         struct private_dccp_recv_data *pdd;
  71         struct dccp_recv_args_info *conf = rn->conf;
  72         int ret;
  73         struct addrinfo *ai;
  74         char *tmp;
  75
  76         rn->buf = para_calloc(DCCP_BUFSIZE);
  77         rn->private_data = para_calloc(sizeof(struct private_dccp_recv_data));
  78         pdd = rn->private_data;
  79         ret = dccp_get_socket();
  80         if (ret < 0)
  81                 goto err_out;
  82         pdd->fd = ret;
  83
  84         tmp = make_message("%d", conf->port_arg);
  85         ret = getaddrinfo(conf->host_arg, tmp, NULL, &ai);
  86         free(tmp);
  87         if (ret) {
  88                 ret = -E_ADDR_INFO;
  89                 goto err_out;
  90         }
  91         ret = dccp_set_socket(pdd->fd);
  92         if (ret < 0)
  93                 goto err_out;
  94         PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg, conf->port_arg);
  95         ret = -E_DCCP_CONNECT;
  96         if (connect(pdd->fd, ai->ai_addr, ai->ai_addrlen) < 0)
  97                 goto err_out;
  98         return 1;
  99 err_out:
 100         dccp_recv_close(rn);
 101         return ret;
 102 }
 103
 104 static void dccp_shutdown(void)
 105 {
 106         ; /* nothing to do */
 107 }
 108
 109 static void *dccp_recv_parse_config(int argc, char **argv)
 110 {
 111         struct dccp_recv_args_info *tmp = para_calloc(sizeof(struct dccp_recv_args_info));
 112
 113         if (!dccp_recv_cmdline_parser(argc, argv, tmp))
 114                 return tmp;
 115         free(tmp);
 116         return NULL;
 117 }
 118
 119 static int dccp_recv_pre_select(struct receiver_node *rn, fd_set *rfds,
 120                 __unused fd_set *wfds, __unused struct timeval *timeout)
 121 {
 122         struct private_dccp_recv_data *pdd = rn->private_data;
 123
 124         if (!pdd)
 125                 return -1;
 126         FD_SET(pdd->fd, rfds);
 127         return pdd->fd;
 128 }
 129
 130 static int dccp_recv_post_select(struct receiver_node *rn, int select_ret,
 131                 fd_set *rfds, __unused fd_set *wfds)
 132 {
 133         int ret;
 134         struct private_dccp_recv_data *pdd = rn->private_data;
 135
 136         if (!select_ret || !pdd || !FD_ISSET(pdd->fd, rfds))
 137                 return 1; /* nothing to do */
 138         if (rn->loaded >= DCCP_BUFSIZE)
 139                 return -E_DCCP_OVERRUN;
 140         ret = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
 141                 DCCP_BUFSIZE - rn->loaded);
 142         if (ret <= 0) {
 143                 PARA_INFO_LOG("%s\n", ret? PARA_STRERROR(-ret) : "eof");
 144                 return ret;
 145         }
 146         rn->loaded += ret;
 147         return 1;
 148 }
 149
 150 /**
 151  * the init function of the dccp receiver
 152  *
 153  * \param r pointer to the receiver struct to initialize
 154  *
 155  * Initialize all function pointers of \a r
 156  */
 157 void dccp_recv_init(struct receiver *r)
 158 {
 159         r->shutdown = dccp_shutdown;
 160         r->open = dccp_recv_open;
 161         r->close = dccp_recv_close;
 162         r->pre_select = dccp_recv_pre_select;
 163         r->post_select = dccp_recv_post_select;
 164         r->parse_config = dccp_recv_parse_config;
 165 }