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 /** \file dccp_send.c paraslash's dccp sender */
  20
  21 /*
  22  * based on server.c of dccp-cs-0.01.tar.bz2,
  23  * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
  24  */
  25
  26 #include "server.h"
  27 #include "net.h"
  28 #include "list.h"
  29 #include "afs.h"
  30 #include "send.h"
  31 #include "dccp.h"
  32 #include "error.h"
  33 #include "string.h"
  34 #include "server.cmdline.h"
  35 extern struct gengetopt_args_info conf;
  36 /** the list of connected clients **/
  37 static struct list_head clients;
  38 static int listen_fd = -1;
  39 static struct sender *self;
  40
  41 /** describes one connected client */
  42 struct dccp_client {
  43         /** the dccp socket */
  44         int fd;
  45         /** address information about the client */
  46         struct sockaddr_in addr;
  47         /** the position of this client in the client list */
  48         struct list_head node;
  49         /** non-zero if audio file header has been sent */
  50         int header_sent;
  51 };
  52
  53 static void dccp_pre_select( int *max_fileno, fd_set *rfds,
  54                 __a_unused fd_set *wfds)
  55 {
  56         if (listen_fd < 0)
  57                 return;
  58         FD_SET(listen_fd, rfds);
  59         *max_fileno = PARA_MAX(*max_fileno, listen_fd);
  60 }
  61
  62 static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
  63 {
  64         struct dccp_client *dc;
  65         int ret;
  66
  67         if (!FD_ISSET(listen_fd, rfds))
  68                 return;
  69         dc = para_calloc(sizeof(struct dccp_client));
  70         ret = para_accept(listen_fd, &dc->addr, sizeof(struct sockaddr_in));
  71         if (ret < 0) {
  72                 PARA_ERROR_LOG("%s", PARA_STRERROR(-ret));
  73                 return;
  74         }
  75         PARA_NOTICE_LOG("connection from %s\n", inet_ntoa(dc->addr.sin_addr));
  76         dc->fd = ret;
  77         list_add(&dc->node, &clients);
  78 }
  79
  80 static int dccp_open(void)
  81 {
  82         struct sockaddr_in servaddr;
  83         int ret;
  84
  85         ret = dccp_get_socket();
  86         if (ret < 0)
  87                 return ret;
  88         listen_fd = ret;
  89
  90         bzero(&servaddr, sizeof(servaddr));
  91         servaddr.sin_family = AF_INET;
  92         servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
  93         servaddr.sin_port = htons(conf.dccp_port_arg);
  94         ret = bind(listen_fd, (struct sockaddr *)&servaddr, sizeof(servaddr));
  95         if (ret < 0)
  96                 return -E_DCCP_BIND;
  97         ret = dccp_set_socket(listen_fd);
  98         if (ret < 0)
  99                 return ret;
 100         ret = listen(listen_fd, 0);
 101         if (ret < 0)
 102                 return -E_DCCP_LISTEN;
 103         PARA_DEBUG_LOG("listening on fd %d\n", listen_fd);
 104         return 1;
 105 }
 106
 107 static void dccp_shutdown_client(struct dccp_client *dc)
 108 {
 109         PARA_DEBUG_LOG("shutting down %s (fd %d)\n", inet_ntoa(dc->addr.sin_addr),
 110                 dc->fd);
 111         close(dc->fd);
 112         list_del(&dc->node);
 113         free(dc);
 114 }
 115
 116 static int dccp_write(int fd, const char *buf, size_t len)
 117 {
 118         size_t send, written = 0;
 119         int ret;
 120 again:
 121         send = PARA_MIN(1024, len - written);
 122         ret = write(fd, buf + written, send);
 123         if (ret < 0)
 124                 goto err_out;
 125         written += ret;
 126         if (written >= len)
 127                 return written;
 128         ret = write_ok(fd);
 129         if (ret > 0)
 130                 goto again;
 131 err_out:
 132         return -E_DCCP_WRITE;
 133 }
 134
 135 static void dccp_send(long unsigned current_chunk,
 136                 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
 137 {
 138         struct dccp_client *dc, *tmp;
 139         int ret, header_len;
 140         char *header_buf;
 141
 142         if (listen_fd < 0 || !len)
 143                 return;
 144
 145         list_for_each_entry_safe(dc, tmp, &clients, node) {
 146                 ret = write_ok(dc->fd);
 147                 if (ret < 0) {
 148                         dccp_shutdown_client(dc);
 149                         continue;
 150                 }
 151                 if (!ret)
 152                         continue;
 153                 if (!dc->header_sent && current_chunk) {
 154                         header_buf = afs_get_header(&header_len);
 155                         if (!header_buf || header_len <= 0)
 156                                 continue; /* header not yet available */
 157                         ret = dccp_write(dc->fd, header_buf, header_len);
 158                         if (ret != header_len) {
 159                                 int err = errno;
 160                                 PARA_ERROR_LOG("header write: %d/%d (%s)\n",
 161                                         ret, header_len, ret < 0?
 162                                         strerror(err) : "");
 163                                 dccp_shutdown_client(dc);
 164                                 continue;
 165                         }
 166                         dc->header_sent = 1;
 167                         ret = write_ok(dc->fd);
 168                         if (ret < 0) {
 169                                 dccp_shutdown_client(dc);
 170                                 continue;
 171                         }
 172                         if (!ret)
 173                                 continue;
 174                 }
 175 //              PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
 176                 ret = dccp_write(dc->fd, buf, len);
 177                 if (ret != len)
 178                         dccp_shutdown_client(dc);
 179         }
 180 }
 181
 182 static void dccp_shutdown_clients(void)
 183 {
 184         struct dccp_client *dc, *tmp;
 185
 186         list_for_each_entry_safe(dc, tmp, &clients, node)
 187                 dccp_shutdown_client(dc);
 188 }
 189
 190 static char *dccp_info(void)
 191 {
 192         static char *buf;
 193         int num_clients = 0;
 194         struct dccp_client *dc, *tmp;
 195
 196         free(buf);
 197         list_for_each_entry_safe(dc, tmp, &clients, node)
 198                 num_clients++;
 199         buf = make_message("dccp connected clients: %d\n", num_clients);
 200         return buf;
 201 }
 202
 203 static char *dccp_help(void)
 204 {
 205         return make_message("no help available\n");
 206 }
 207
 208 /**
 209  * the init function of the dccp sender
 210  *
 211  * \param s pointer to the dccp sender struct
 212  *
 213  * It initializes all function pointers of \a s and starts
 214  * listening on the given port.
 215  */
 216 void dccp_send_init(struct sender *s)
 217 {
 218         int ret;
 219
 220         INIT_LIST_HEAD(&clients);
 221         s->info = dccp_info;
 222         s->send = dccp_send;
 223         s->pre_select = dccp_pre_select;
 224         s->post_select = dccp_post_select;
 225         s->shutdown_clients = dccp_shutdown_clients;
 226         s->help = dccp_help;
 227         s->client_cmds[SENDER_ON] = NULL;
 228         s->client_cmds[SENDER_OFF] = NULL;
 229         s->client_cmds[SENDER_DENY] = NULL;
 230         s->client_cmds[SENDER_ALLOW] = NULL;
 231         s->client_cmds[SENDER_ADD] = NULL;
 232         s->client_cmds[SENDER_DELETE] = NULL;
 233         self = s;
 234         ret = dccp_open();
 235         if (ret < 0) {
 236                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 237                 s->status = SENDER_OFF;
 238         } else
 239                 s->status = SENDER_ON;
 240 }