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         dc = para_calloc(sizeof(struct dccp_client));
  68         ret = para_accept(listen_fd, &dc->addr, sizeof(struct sockaddr_in));
  69         if (ret < 0) {
  70                 PARA_ERROR_LOG("%s", PARA_STRERROR(-ret));
  71                 return;
  72         }
  73         PARA_NOTICE_LOG("connection from %s\n", inet_ntoa(dc->addr.sin_addr));
  74         dc->fd = ret;
  75         list_add(&dc->node, &clients);
  76 }
  77
  78 static int dccp_open(void)
  79 {
  80         struct sockaddr_in servaddr;
  81         int ret;
  82
  83         ret = dccp_get_socket();
  84         if (ret < 0)
  85                 return ret;
  86         listen_fd = ret;
  87
  88         bzero(&servaddr, sizeof(servaddr));
  89         servaddr.sin_family = AF_INET;
  90         servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
  91         servaddr.sin_port = htons(conf.dccp_port_arg);
  92         ret = bind(listen_fd, (struct sockaddr *)&servaddr, sizeof(servaddr));
  93         if (ret < 0)
  94                 return -E_DCCP_BIND;
  95         ret = dccp_set_socket(listen_fd);
  96         if (ret < 0)
  97                 return ret;
  98         ret = listen(listen_fd, 0);
  99         if (ret < 0)
 100                 return -E_DCCP_LISTEN;
 101         PARA_DEBUG_LOG("listening on fd %d\n", listen_fd);
 102         return 1;
 103 }
 104
 105 static void dccp_shutdown_client(struct dccp_client *dc)
 106 {
 107         PARA_DEBUG_LOG("shutting down %s (fd %d)\n", inet_ntoa(dc->addr.sin_addr),
 108                 dc->fd);
 109         close(dc->fd);
 110         list_del(&dc->node);
 111         free(dc);
 112 }
 113
 114 static int dccp_write(int fd, const char *buf, size_t len)
 115 {
 116         size_t send, written = 0;
 117         int ret;
 118 again:
 119         send = MIN(1024, len - written);
 120         ret = write(fd, buf + written, send);
 121         if (ret < 0)
 122                 goto err_out;
 123         written += ret;
 124         if (written >= len)
 125                 return written;
 126         ret = write_ok(fd);
 127         if (ret > 0)
 128                 goto again;
 129 err_out:
 130         return -E_DCCP_WRITE;
 131 }
 132
 133 static void dccp_send(__unused struct audio_format *af,
 134                 long unsigned current_chunk,
 135                 __unused long unsigned chunks_sent, const char *buf, size_t len)
 136 {
 137         struct dccp_client *dc, *tmp;
 138         int ret, header_len;
 139         char *header_buf;
 140
 141         if (listen_fd < 0 || !len)
 142                 return;
 143
 144         list_for_each_entry_safe(dc, tmp, &clients, node) {
 145                 ret = write_ok(dc->fd);
 146                 if (ret < 0) {
 147                         dccp_shutdown_client(dc);
 148                         continue;
 149                 }
 150                 if (!ret)
 151                         continue;
 152                 if (!dc->header_sent && af->get_header_info && current_chunk) {
 153                         header_buf = af->get_header_info(&header_len);
 154                         if (!header_buf || header_len <= 0)
 155                                 continue; /* header not yet available */
 156                         ret = dccp_write(dc->fd, header_buf, header_len);
 157                         if (ret != header_len) {
 158                                 int err = errno;
 159                                 PARA_ERROR_LOG("header write: %d/%d (%s)\n",
 160                                         ret, header_len, ret < 0?
 161                                         strerror(err) : "");
 162                                 dccp_shutdown_client(dc);
 163                                 continue;
 164                         }
 165                         dc->header_sent = 1;
 166                         ret = write_ok(dc->fd);
 167                         if (ret < 0) {
 168                                 dccp_shutdown_client(dc);
 169                                 continue;
 170                         }
 171                         if (!ret)
 172                                 continue;
 173                 }
 174 //              PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
 175                 ret = dccp_write(dc->fd, buf, len);
 176                 if (ret != len)
 177                         dccp_shutdown_client(dc);
 178         }
 179 }
 180
 181 static void dccp_shutdown_clients(void)
 182 {
 183         struct dccp_client *dc, *tmp;
 184
 185         list_for_each_entry_safe(dc, tmp, &clients, node)
 186                 dccp_shutdown_client(dc);
 187 }
 188
 189 static char *dccp_info(void)
 190 {
 191         static char *buf;
 192         int num_clients = 0;
 193         struct dccp_client *dc, *tmp;
 194
 195         free(buf);
 196         list_for_each_entry_safe(dc, tmp, &clients, node)
 197                 num_clients++;
 198         buf = make_message("dccp connected clients: %d\n", num_clients);
 199         return buf;
 200 }
 201
 202 static char *dccp_help(void)
 203 {
 204         return make_message("no help available\n");
 205 }
 206
 207 void dccp_send_init(struct sender *s)
 208 {
 209         int ret;
 210
 211         INIT_LIST_HEAD(&clients);
 212         s->info = dccp_info;
 213         s->send = dccp_send;
 214         s->pre_select = dccp_pre_select;
 215         s->post_select = dccp_post_select;
 216         s->shutdown_clients = dccp_shutdown_clients;
 217         s->help = dccp_help;
 218         s->client_cmds[SENDER_ON] = NULL;
 219         s->client_cmds[SENDER_OFF] = NULL;
 220         s->client_cmds[SENDER_DENY] = NULL;
 221         s->client_cmds[SENDER_ALLOW] = NULL;
 222         s->client_cmds[SENDER_ADD] = NULL;
 223         s->client_cmds[SENDER_DELETE] = NULL;
 224         self = s;
 225         ret = dccp_open();
 226         if (ret < 0)
 227                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 228         else
 229                 s->status = SENDER_ON;
 230 }