dccp_send.c

   1 /*
   2  * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file dccp_send.c Paraslash's dccp sender. */
   8
   9 /*
  10  * based on server.c of dccp-cs-0.01.tar.bz2,
  11  * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
  12  */
  13
  14 #include <sys/types.h>
  15 #include <dirent.h>
  16
  17 #include "para.h"
  18 #include "error.h"
  19 #include "string.h"
  20 #include "afh.h"
  21 #include "afs.h"
  22 #include "server.h"
  23 #include "net.h"
  24 #include "list.h"
  25 #include "vss.h"
  26 #include "send.h"
  27 #include "fd.h"
  28 #include "close_on_fork.h"
  29 #include "chunk_queue.h"
  30 #include "server.cmdline.h"
  31 #include "acl.h"
  32
  33 /** Do not write more than that many bytes at once. */
  34 #define DCCP_MAX_BYTES_PER_WRITE 1024
  35
  36 static struct sender_status dccp_sender_status, *dss = &dccp_sender_status;
  37
  38 static void dccp_pre_select(int *max_fileno, fd_set *rfds,
  39                 __a_unused fd_set *wfds)
  40 {
  41         if (dss->listen_fd >= 0)
  42                 para_fd_set(dss->listen_fd, rfds, max_fileno);
  43 }
  44
  45 static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
  46 {
  47         struct sender_client *sc;
  48
  49         if (dss->listen_fd < 0 || !FD_ISSET(dss->listen_fd, rfds))
  50                 return;
  51         sc = accept_sender_client(dss);
  52         if (!sc)
  53                 return;
  54         /*
  55          * Bypass unused CCID paths: the sender does not receive application data
  56          * from the client; by shutting down this unused communication path we can
  57          * reduce processing costs a bit. See analogous comment in dccp_recv.c.
  58          */
  59         if (shutdown(sc->fd, SHUT_RD) >= 0)
  60                 return;
  61         PARA_WARNING_LOG("%s\n", strerror(errno));
  62         shutdown_client(sc, dss);
  63 }
  64
  65 static void dccp_send(long unsigned current_chunk,
  66                 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
  67 {
  68         struct sender_client *sc, *tmp;
  69
  70         list_for_each_entry_safe(sc, tmp, &dss->client_list, node)
  71                 send_chunk(sc, dss, DCCP_MAX_BYTES_PER_WRITE, current_chunk, buf,
  72                         len);
  73 }
  74
  75 static void dccp_shutdown_clients(void)
  76 {
  77         shutdown_clients(dss);
  78 }
  79
  80 static int dccp_com_on(__a_unused struct sender_command_data *scd)
  81 {
  82         return generic_com_on(dss, IPPROTO_DCCP);
  83 }
  84
  85 static int dccp_com_off(__a_unused struct sender_command_data *scd)
  86 {
  87         generic_com_off(dss);
  88         return 1;
  89 }
  90
  91
  92 static int dccp_com_deny(struct sender_command_data *scd)
  93 {
  94         generic_com_deny(scd, dss);
  95         return 1;
  96 }
  97
  98 static int dccp_com_allow(struct sender_command_data *scd)
  99 {
 100         generic_com_allow(scd, dss);
 101         return 1;
 102 }
 103
 104 static char *dccp_info(void)
 105 {
 106         return get_sender_info(dss, "dccp");
 107 }
 108
 109 /**
 110  * The init function of the dccp sender.
 111  *
 112  * \param s pointer to the dccp sender struct.
 113  *
 114  * It initializes all function pointers of \a s and starts
 115  * listening on the given port.
 116  */
 117 void dccp_send_init(struct sender *s)
 118 {
 119         int ret;
 120
 121         s->info = dccp_info;
 122         s->send = dccp_send;
 123         s->pre_select = dccp_pre_select;
 124         s->post_select = dccp_post_select;
 125         s->shutdown_clients = dccp_shutdown_clients;
 126         s->help = generic_sender_help;
 127         s->client_cmds[SENDER_ON] = dccp_com_on;
 128         s->client_cmds[SENDER_OFF] = dccp_com_off;
 129         s->client_cmds[SENDER_DENY] = dccp_com_deny;
 130         s->client_cmds[SENDER_ALLOW] = dccp_com_allow;
 131         s->client_cmds[SENDER_ADD] = NULL;
 132         s->client_cmds[SENDER_DELETE] = NULL;
 133
 134         init_sender_status(dss, conf.dccp_access_arg, conf.dccp_access_given,
 135                 conf.dccp_port_arg, conf.dccp_max_clients_arg,
 136                 conf.dccp_default_deny_given);
 137         ret = generic_com_on(dss, IPPROTO_DCCP);
 138         if (ret < 0)
 139                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 140 }