dccp_send.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 server.c of dccp-cs-0.01.tar.bz2,
  21  * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
  22  */
  23
  24 #include "server.h"
  25 #include "net.h"
  26 #include "list.h"
  27 #include "afs.h"
  28 #include "send.h"
  29 #include "dccp.h"
  30 #include "error.h"
  31 #include "string.h"
  32 #include "server.cmdline.h"
  33 extern struct gengetopt_args_info conf;
  34 /** the list of connected clients **/
  35 static struct list_head clients;
  36 static int listen_fd = -1;
  37 static struct sender *self;
  38
  39 /** describes one connected client */
  40 struct dccp_client {
  41         /** the dccp socket */
  42         int fd;
  43         /** address information about the client */
  44         struct sockaddr_in addr;
  45         /** the position of this client in the client list */
  46         struct list_head node;
  47         int header_sent; /* non-zero if audio file header has been sent */
  48 };
  49
  50 static void dccp_pre_select(__unused struct audio_format *af, int *max_fileno, fd_set *rfds,
  51                 __unused fd_set *wfds)
  52 {
  53         if (listen_fd < 0)
  54                 return;
  55         FD_SET(listen_fd, rfds);
  56         *max_fileno = MAX(*max_fileno, listen_fd);
  57 }
  58
  59 static void dccp_post_select(__unused struct audio_format *af, fd_set *rfds,
  60                 __unused fd_set *wfds)
  61 {
  62         struct dccp_client *dc;
  63         int ret;
  64
  65         if (!FD_ISSET(listen_fd, rfds))
  66                 return;
  67         PARA_NOTICE_LOG("%s", "accepting...\n");
  68         dc = para_calloc(sizeof(struct dccp_client));
  69         ret = para_accept(listen_fd, &dc->addr, sizeof(struct sockaddr_in));
  70         if (ret < 0) {
  71                 PARA_ERROR_LOG("%s", PARA_STRERROR(-ret));
  72                 return;
  73         }
  74         PARA_NOTICE_LOG("%s", "connection\n");
  75         dc->fd = ret;
  76         list_add(&dc->node, &clients);
  77 }
  78
  79 static int dccp_open(void)
  80 {
  81         struct sockaddr_in servaddr;
  82         int ret;
  83
  84         ret = dccp_get_socket();
  85         if (ret < 0)
  86                 return ret;
  87         listen_fd = ret;
  88
  89         bzero(&servaddr, sizeof(servaddr));
  90         servaddr.sin_family = AF_INET;
  91         servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
  92         servaddr.sin_port = htons(conf.dccp_port_arg);
  93         ret = bind(listen_fd, (struct sockaddr *)&servaddr, sizeof(servaddr));
  94         if (ret < 0)
  95                 return -E_DCCP_BIND;
  96         ret = dccp_set_socket(listen_fd);
  97         if (ret < 0)
  98                 return ret;
  99         ret = listen(listen_fd, 0);
 100         if (ret < 0)
 101                 return -E_DCCP_LISTEN;
 102         PARA_DEBUG_LOG("listening on fd %d\n", listen_fd);
 103         return 1;
 104 }
 105
 106 static void dccp_shutdown_client(struct dccp_client *dc)
 107 {
 108         close(dc->fd);
 109         list_del(&dc->node);
 110         free(dc);
 111 }
 112
 113 static void dccp_send(__unused struct audio_format *af,
 114                 long unsigned current_chunk,
 115                 __unused long unsigned chunks_sent, const char *buf, size_t len)
 116 {
 117         struct dccp_client *dc, *tmp;
 118         int ret, header_len;
 119         char *header_buf;
 120
 121         if (listen_fd < 0 || !len)
 122                 return;
 123
 124         list_for_each_entry_safe(dc, tmp, &clients, node) {
 125                 ret = write_ok(dc->fd);
 126                 if (ret < 0) {
 127                         dccp_shutdown_client(dc);
 128                         continue;
 129                 }
 130                 if (!ret)
 131                         continue;
 132                 if (!dc->header_sent && af->get_header_info && current_chunk) {
 133                         header_buf = af->get_header_info(&header_len);
 134                         if (!header_buf || header_len <= 0)
 135                                 continue; /* header not yet available */
 136                         ret = write(dc->fd, header_buf, header_len);
 137                         if (ret != header_len) {
 138                                 int err = errno;
 139                                 PARA_ERROR_LOG("header write: %d/%d (%s)\n",
 140                                         ret, header_len, ret < 0?
 141                                         strerror(err) : "");
 142                                 dccp_shutdown_client(dc);
 143                                 continue;
 144                         }
 145                         ret = write_ok(dc->fd);
 146                         if (ret < 0) {
 147                                 dccp_shutdown_client(dc);
 148                                 continue;
 149                         }
 150                         if (!ret)
 151                                 continue;
 152                 }
 153 //              PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
 154                 ret = write(dc->fd, buf, len);
 155                 if (ret != len)
 156                         dccp_shutdown_client(dc);
 157         }
 158 }
 159
 160 static void dccp_shutdown_clients(void)
 161 {
 162         struct dccp_client *dc, *tmp;
 163
 164         list_for_each_entry_safe(dc, tmp, &clients, node)
 165                 dccp_shutdown_client(dc);
 166 }
 167
 168 static char *dccp_info(void)
 169 {
 170         static char *buf;
 171         int num_clients = 0;
 172         struct dccp_client *dc, *tmp;
 173
 174         free(buf);
 175         list_for_each_entry_safe(dc, tmp, &clients, node)
 176                 num_clients++;
 177         buf = make_message("%d connected clients\n", num_clients);
 178         return buf;
 179 }
 180
 181 static char *dccp_help(void)
 182 {
 183         return make_message("no help available\n");
 184 }
 185
 186 void dccp_send_init(struct sender *s)
 187 {
 188         int ret;
 189
 190         INIT_LIST_HEAD(&clients);
 191         s->info = dccp_info;
 192         s->send = dccp_send;
 193         s->pre_select = dccp_pre_select;
 194         s->post_select = dccp_post_select;
 195         s->shutdown_clients = dccp_shutdown_clients;
 196         s->help = dccp_help;
 197         s->client_cmds[SENDER_ON] = NULL;
 198         s->client_cmds[SENDER_OFF] = NULL;
 199         s->client_cmds[SENDER_DENY] = NULL;
 200         s->client_cmds[SENDER_ALLOW] = NULL;
 201         s->client_cmds[SENDER_ADD] = NULL;
 202         s->client_cmds[SENDER_DELETE] = NULL;
 203         self = s;
 204         ret = dccp_open();
 205         if (ret < 0)
 206                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 207         else
 208                 s->status = SENDER_ON;
 209 }