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[paraslash.git] / udp_send.c
index b41c0eb..04e2982 100644 (file)
@@ -1,32 +1,30 @@
-/*
- * Copyright (C) 2005-2013 Andre Noll <maan@systemlinux.org>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
 
 /** \file udp_send.c Para_server's udp sender. */
 
-
-#include <regex.h>
-#include <sys/time.h>
+#include <netinet/in.h>
 #include <sys/socket.h>
+#include <regex.h>
+#include <sys/types.h>
 #include <netinet/udp.h>
 #include <net/if.h>
-#include <osl.h>
+#include <arpa/inet.h>
+#include <sys/un.h>
+#include <netdb.h>
+#include <lopsub.h>
 
-#include "server.cmdline.h"
+#include "server.lsg.h"
 #include "para.h"
 #include "error.h"
 #include "string.h"
 #include "afh.h"
-#include "afs.h"
+#include "net.h"
 #include "server.h"
 #include "list.h"
 #include "send.h"
 #include "sched.h"
 #include "vss.h"
 #include "portable_io.h"
-#include "net.h"
 #include "fd.h"
 #include "close_on_fork.h"
 
@@ -45,6 +43,8 @@ struct udp_target {
        struct fec_client *fc;
        /** The FEC parameters for this target. */
        struct fec_client_parms fcp;
+       /** Whether we already sent the FEC eof packet to this target. */
+       bool sent_fec_eof;
 };
 
 static struct list_head targets;
@@ -53,15 +53,17 @@ static int sender_status;
 static void udp_close_target(struct sender_client *sc)
 {
        const char *buf;
-       size_t len = vss_get_fec_eof_packet(&buf);
+       size_t len;
+       struct udp_target *ut = sc->private_data;
 
-       /*
-        * Ignore the return value of wirte() since we are closing the target
-        * anyway. The sole purpose of the "do_nothing" statement is to silence
-        * gcc.
-        */
+       if (ut->sent_fec_eof)
+               return;
+       PARA_NOTICE_LOG("sending FEC EOF\n");
+       len = vss_get_fec_eof_packet(&buf);
+       /* Ignore write() errors since we are closing the target anyway. */
        if (write(sc->fd, buf, len))
-               do_nothing;
+               do_nothing; /* avoid "ignoring return value" warning */
+       ut->sent_fec_eof = true;
 }
 
 static void udp_delete_target(struct sender_client *sc, const char *msg)
@@ -70,8 +72,11 @@ static void udp_delete_target(struct sender_client *sc, const char *msg)
 
        PARA_NOTICE_LOG("deleting %s (%s) from list\n", sc->name, msg);
        udp_close_target(sc);
-       close(sc->fd);
-       del_close_on_fork_list(sc->fd);
+       /* command handlers already called close_listed_fds() */
+       if (!process_is_command_handler()) {
+               close(sc->fd);
+               del_close_on_fork_list(sc->fd);
+       }
        vss_del_fec_client(ut->fc);
        list_del(&sc->node);
        free(sc->name);
@@ -90,11 +95,11 @@ static int mcast_sender_setup(struct sender_client *sc)
 {
        struct sockaddr_storage ss;
        socklen_t sslen = sizeof(ss);
-       int ttl = conf.udp_ttl_arg, id = 0;
+       int ttl = OPT_INT32_VAL(UDP_TTL), id = 0;
        const int on = 1;
 
-       if (conf.udp_mcast_iface_given) {
-               char *iface = conf.udp_mcast_iface_arg;
+       if (OPT_GIVEN(UDP_MCAST_IFACE)) {
+               const char *iface = OPT_STRING_VAL(UDP_MCAST_IFACE);
 
                id = if_nametoindex(iface);
                if (id == 0)
@@ -155,16 +160,18 @@ err:
        return -ERRNO_TO_PARA_ERROR(errno);
 }
 
-static void udp_init_session(struct sender_client *sc)
+static void udp_shutdown_targets(void)
 {
-       PARA_NOTICE_LOG("sending to udp %s\n", sc->name);
+       struct sender_client *sc, *tmp;
+       list_for_each_entry_safe(sc, tmp, &targets, node)
+               udp_close_target(sc);
 }
 
-static void udp_shutdown_targets(void)
+static void udp_shutdown(void)
 {
        struct sender_client *sc, *tmp;
        list_for_each_entry_safe(sc, tmp, &targets, node)
-               udp_close_target(sc);
+               udp_delete_target(sc, "shutdown");
 }
 
 static int udp_resolve_target(const char *url, struct sender_command_data *scd)
@@ -175,7 +182,7 @@ static int udp_resolve_target(const char *url, struct sender_command_data *scd)
        ret = parse_fec_url(url, scd);
        if (ret)
                return ret;
-       port = scd->port > 0 ? scd->port : conf.udp_default_port_arg;
+       port = scd->port > 0 ? scd->port : OPT_UINT32_VAL(UDP_DEFAULT_PORT);
 
        ret = para_connect_simple(IPPROTO_UDP, scd->host, port);
        if (ret < 0)
@@ -191,14 +198,14 @@ static int udp_resolve_target(const char *url, struct sender_command_data *scd)
 
 static int udp_com_on(__a_unused struct sender_command_data *scd)
 {
-       sender_status = SENDER_ON;
+       sender_status = SENDER_on;
        return 1;
 }
 
 static int udp_com_off(__a_unused struct sender_command_data *scd)
 {
        udp_shutdown_targets();
-       sender_status = SENDER_OFF;
+       sender_status = SENDER_off;
        return 1;
 }
 
@@ -236,9 +243,11 @@ static int udp_com_delete(struct sender_command_data *scd)
 /** Initialize UDP session and set maximum payload size. */
 static int udp_init_fec(struct sender_client *sc)
 {
+       struct udp_target *ut = sc->private_data;
        int mps;
 
-       udp_init_session(sc);
+       PARA_NOTICE_LOG("sending to udp %s\n", sc->name);
+       ut->sent_fec_eof = false;
        mps = generic_max_transport_msg_size(sc->fd) - sizeof(struct udphdr);
        PARA_INFO_LOG("current MPS = %d bytes\n", mps);
        return mps;
@@ -281,7 +290,7 @@ static void udp_send_fec(struct sender_client *sc, char *buf, size_t len)
 {
        int ret;
 
-       if (sender_status == SENDER_OFF)
+       if (sender_status == SENDER_off)
                return;
        if (len == 0)
                return;
@@ -351,7 +360,7 @@ err:
        return ret;
 }
 
-static char *udp_info(void)
+static char *udp_status(void)
 {
        struct sender_client *sc;
        char *ret, *tgts = NULL;
@@ -367,12 +376,11 @@ static char *udp_info(void)
                tgts = tmp;
        }
        ret = make_message(
-               "udp sender:\n"
-               "\tstatus: %s\n"
-               "\tport: %s\n"
-               "\ttargets: %s\n",
-               (sender_status == SENDER_ON)? "on" : "off",
-               stringify_port(conf.udp_default_port_arg, "udp"),
+               "status: %s\n"
+               "port: %s\n"
+               "targets: %s\n",
+               (sender_status == SENDER_on)? "on" : "off",
+               stringify_port(OPT_UINT32_VAL(UDP_DEFAULT_PORT), "udp"),
                tgts? tgts : "(none)"
        );
        free(tgts);
@@ -385,10 +393,11 @@ static void udp_init_target_list(void)
        int i;
 
        INIT_LIST_HEAD(&targets);
-       for (i = 0; i < conf.udp_target_given; i++) {
-               if (udp_resolve_target(conf.udp_target_arg[i], &scd) < 0)
+       for (i = 0; i < OPT_GIVEN(UDP_TARGET); i++) {
+               const char *arg = lls_string_val(i, OPT_RESULT(UDP_TARGET));
+               if (udp_resolve_target(arg, &scd) < 0)
                        PARA_CRIT_LOG("not adding requested target '%s'\n",
-                                       conf.udp_target_arg[i]);
+                                       arg);
                else
                        udp_com_add(&scd);
        }
@@ -413,32 +422,38 @@ static char *udp_help(void)
        );
 }
 
-/**
- * The init function of para_server's udp sender.
- *
- * \param s Pointer to the udp sender struct.
- *
- * It initializes all function pointers of \a s and the list of udp targets.
- */
-void udp_send_init(struct sender *s)
+/* Initialize the list of udp targets. */
+static void udp_send_init(void)
 {
        INIT_LIST_HEAD(&targets);
-       s->info = udp_info;
-       s->help = udp_help;
-       s->send = NULL;
-       s->pre_select = NULL;
-       s->post_select = NULL;
-       s->shutdown_clients = udp_shutdown_targets;
-       s->resolve_target = udp_resolve_target;
-       s->client_cmds[SENDER_ON] = udp_com_on;
-       s->client_cmds[SENDER_OFF] = udp_com_off;
-       s->client_cmds[SENDER_DENY] = NULL;
-       s->client_cmds[SENDER_ALLOW] = NULL;
-       s->client_cmds[SENDER_ADD] = udp_com_add;
-       s->client_cmds[SENDER_DELETE] = udp_com_delete;
-       sender_status = SENDER_OFF;
+       sender_status = SENDER_off;
        udp_init_target_list();
-       if (!conf.udp_no_autostart_given)
-               sender_status = SENDER_ON;
+       if (!OPT_GIVEN(UDP_NO_AUTOSTART))
+               sender_status = SENDER_on;
        PARA_DEBUG_LOG("udp sender init complete\n");
 }
+
+/**
+ * The UDP sender.
+ *
+ * In contrast to the other senders the UDP sender is active in the sense that
+ * it initiates the network connection according to its list of targets rather
+ * than passively waiting for clients to connect. Like DCCP streams, UDP
+ * streams are always sent FEC-encoded. The UDP sender is the only sender which
+ * supports IP multicasting.
+ */
+const struct sender udp_sender = {
+       .name = "udp",
+       .init = udp_send_init,
+       .shutdown = udp_shutdown,
+       .shutdown_clients = udp_shutdown_targets,
+       .resolve_target = udp_resolve_target,
+       .client_cmds = {
+               [SENDER_on] = udp_com_on,
+               [SENDER_off] = udp_com_off,
+               [SENDER_add] = udp_com_add,
+               [SENDER_delete] = udp_com_delete,
+       },
+       .help = udp_help,
+       .status = udp_status,
+};