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-rw-r--r--mcastseed/AUTHORS3
-rw-r--r--mcastseed/COPYING340
-rw-r--r--mcastseed/ChangeLog0
-rw-r--r--mcastseed/Makefile.am7
l---------mcastseed/README1
-rw-r--r--mcastseed/README.md9
-rw-r--r--mcastseed/configure.ac48
-rw-r--r--mcastseed/src/Makefile.am12
-rw-r--r--mcastseed/src/mcastleech.c227
-rw-r--r--mcastseed/src/mcastseed.c421
-rw-r--r--mcastseed/src/msock.c371
-rw-r--r--mcastseed/src/msock.h74
12 files changed, 1513 insertions, 0 deletions
diff --git a/mcastseed/AUTHORS b/mcastseed/AUTHORS
new file mode 100644
index 0000000..c338cf6
--- /dev/null
+++ b/mcastseed/AUTHORS
@@ -0,0 +1,3 @@
+Ludovic Pouzenc <ludovic@pouzenc.fr>
+Christian Beier <dontmind@freeshell.org>
+tmouse, http://cboard.cprogramming.com/showthread.php?t=67469
diff --git a/mcastseed/COPYING b/mcastseed/COPYING
new file mode 100644
index 0000000..d60c31a
--- /dev/null
+++ b/mcastseed/COPYING
@@ -0,0 +1,340 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+ To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must show them these terms so they know their
+rights.
+
+ We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+ Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software. If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
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+
+ Finally, any free program is threatened constantly by software
+patents. We wish to avoid the danger that redistributors of a free
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+program proprietary. To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License. The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language. (Hereinafter, translation is included without limitation in
+the term "modification".) Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
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+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+ 1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+ 2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
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+
+ a) You must cause the modified files to carry prominent notices
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+
+ b) You must cause any work that you distribute or publish, that in
+ whole or in part contains or is derived from the Program or any
+ part thereof, to be licensed as a whole at no charge to all third
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+
+ c) If the modified program normally reads commands interactively
+ when run, you must cause it, when started running for such
+ interactive use in the most ordinary way, to print or display an
+ announcement including an appropriate copyright notice and a
+ notice that there is no warranty (or else, saying that you provide
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+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
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+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
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+entire whole, and thus to each and every part regardless of who wrote it.
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+Thus, it is not the intent of this section to claim rights or contest
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+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
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+ a) Accompany it with the complete corresponding machine-readable
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+
+ 4. You may not copy, modify, sublicense, or distribute the Program
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+
+ 5. You are not required to accept this License, since you have not
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+
+ 6. Each time you redistribute the Program (or any work based on the
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+
+ 7. If, as a consequence of a court judgment or allegation of patent
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+
+If any portion of this section is held invalid or unenforceable under
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+
+It is not the purpose of this section to induce you to infringe any
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+to distribute software through any other system and a licensee cannot
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+
+This section is intended to make thoroughly clear what is believed to
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+
+ 8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
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+countries not thus excluded. In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation. If the Program does not specify a version number of
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+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission. For software which is copyrighted by the Free
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+make exceptions for this. Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) year name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/mcastseed/ChangeLog b/mcastseed/ChangeLog
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/mcastseed/ChangeLog
diff --git a/mcastseed/Makefile.am b/mcastseed/Makefile.am
new file mode 100644
index 0000000..0f59806
--- /dev/null
+++ b/mcastseed/Makefile.am
@@ -0,0 +1,7 @@
+## Process this file with automake to produce Makefile.in
+
+
+SUBDIRS = \
+ src
+
+
diff --git a/mcastseed/README b/mcastseed/README
new file mode 120000
index 0000000..42061c0
--- /dev/null
+++ b/mcastseed/README
@@ -0,0 +1 @@
+README.md \ No newline at end of file
diff --git a/mcastseed/README.md b/mcastseed/README.md
new file mode 100644
index 0000000..98ddff0
--- /dev/null
+++ b/mcastseed/README.md
@@ -0,0 +1,9 @@
+
+This is a simple multicast file transfer with TCP back-chat.
+Greatly inspired from https://github.com/bk138/Multicast-Client-Server-Example
+
+Tested on GNU/Linux Debian 8, may usable under other OS without big efforts (patches appreciated).
+
+# Building
+To compile, use
+ autoreconf -fi && ./configure && make
diff --git a/mcastseed/configure.ac b/mcastseed/configure.ac
new file mode 100644
index 0000000..ad1db27
--- /dev/null
+++ b/mcastseed/configure.ac
@@ -0,0 +1,48 @@
+dnl Process this file with autoconf to produce a configure script.
+
+AC_INIT(mcastseeder, 0.1)
+
+# Args deprecated http://www.gnu.org/software/automake/manual/automake.html#Modernize-AM_005fINIT_005fAUTOMAKE-invocation
+AM_INIT_AUTOMAKE #(AC_PACKAGE_NAME, AC_PACKAGE_VERSION)
+AM_CONFIG_HEADER(config.h)
+AM_MAINTAINER_MODE
+
+
+
+AC_CANONICAL_HOST
+case $host_os in
+ darwin*)
+ HOST_IS_DARWIN="yes"
+ ;;
+ *mingw32*)
+ HOST_IS_WINDOWS="yes"
+ ;;
+ *)
+ HOST_IS_DARWIN="no"
+ HOST_IS_WINDOWS="no"
+ ;;
+esac
+
+
+
+if test "$HOST_IS_WINDOWS" = "yes"; then
+ WSOCKLIB="-lws2_32"
+ AC_SUBST(WSOCKLIB)
+fi
+
+
+AM_CONDITIONAL(MINGW, [ test "$HOST_IS_WINDOWS" = "yes" ])
+AM_CONDITIONAL(DARWIN, [ test "$HOST_IS_DARWIN" = "yes" ])
+
+AC_ISC_POSIX
+AC_HEADER_STDC
+AC_PROG_CPP
+AC_PROG_CC
+AM_PROG_CC_STDC
+AM_PROG_CC_C_O
+
+
+AC_OUTPUT([
+Makefile
+src/Makefile
+])
diff --git a/mcastseed/src/Makefile.am b/mcastseed/src/Makefile.am
new file mode 100644
index 0000000..b28166c
--- /dev/null
+++ b/mcastseed/src/Makefile.am
@@ -0,0 +1,12 @@
+## Process this file with automake to produce Makefile.in
+
+AM_CFLAGS =\
+ -Wall \
+ -g
+
+bin_PROGRAMS = mcastseed mcastleech
+
+mcastseed_SOURCES = mcastseed.c msock.c
+mcastleech_SOURCES = mcastleech.c msock.c
+
+LDADD = @WSOCKLIB@
diff --git a/mcastseed/src/mcastleech.c b/mcastseed/src/mcastleech.c
new file mode 100644
index 0000000..d19bff9
--- /dev/null
+++ b/mcastseed/src/mcastleech.c
@@ -0,0 +1,227 @@
+/* client.c
+ * Greatly inspired from examples written by tmouse, July 2005
+ * http://cboard.cprogramming.com/showthread.php?t=67469
+ * Modified to run multi-platform by Christian Beier <dontmind@freeshell.org>.
+ */
+
+#ifndef __MINGW32__
+#include <unistd.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include "msock.h"
+
+#define MULTICAST_RECV_BUF 10240
+#define MULTICAST_SO_RCVBUF 425984
+#define DEFAULT_MCAST_IP_STR "ff02::114"
+#define DEFAULT_PORT_STR "9000"
+
+/* Cmdline Arguments */
+char *prog_name = NULL;
+char *mcast_ip = NULL;
+char *port = NULL;
+
+/* Sockets as global, used everywhere, even in die() */
+SOCKET mcast_sock = (SOCKET) -1; /* Multicast socket for receiving data */
+SOCKET ucast_sock = (SOCKET) -1; /* Unicast socket for give feedback to server */
+
+/* Buffer used for earch recvfrom() */
+char recvbuf[MULTICAST_RECV_BUF];
+
+/* Strings to print out representation of various states of the program */
+const char * const state_str[] = {
+ "exiting",
+ "wait_hello_and_connect_back",
+ "wait_start_and_start_job",
+ "receive_data",
+ "finalize_job",
+ "is_there_more_job"
+};
+
+/* Some boring funcs you didn't want to read now */
+void die(char* msg);
+void usage(char *msg);
+void arg_parse(int argc, char* argv[]);
+
+/* Parts of the "protocol", definitions are after main() */
+int wait_hello_and_connect_back();
+int wait_start_and_start_job();
+int receive_data();
+int finalize_job();
+int is_there_more_job();
+
+
+int main(int argc, char* argv[]) {
+ int state = 1; /* state of the "protocol" state machine */
+ int res;
+
+ arg_parse(argc, argv);
+
+ /* Finite state machine */
+ while ( state > 0 ) {
+ fprintf(stderr, "Now in %s state\n", state_str[state]);
+ switch ( state ) {
+ case 1: state = (wait_hello_and_connect_back() == 0)?2:1; break;
+ case 2: state = (wait_start_and_start_job() == 0)?2:3; break;
+ case 3: res = receive_data();
+ if (res==0) state = 4;
+ else if (res==1) state=3;
+ else state = -1;
+ break;
+ case 4: state = (finalize_job() == 0)?5:-2; break;
+ case 5: state = (is_there_more_job() == 0)?2:0; break;
+ }
+ }
+
+ if ( mcast_sock > 0 ) {
+ close(mcast_sock);
+ }
+
+ if ( state < 0 )
+ return -state;
+
+ return EXIT_SUCCESS;
+}
+
+
+int wait_hello_and_connect_back() {
+ /* Buffers for host and service strings after resolve */
+ char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
+ /* Server address, filled by system after first recvfrom */
+ struct sockaddr_storage peer_addr;
+ socklen_t peer_addr_len;
+ /* Various needed variables */
+ ssize_t nread;
+ int res;
+
+ /* Setup mcast_sock */
+ if ( mcast_sock > 0 ) {
+ close(mcast_sock);
+ mcast_sock = 0;
+ }
+ mcast_sock = mcast_recv_socket(mcast_ip, port, MULTICAST_SO_RCVBUF);
+ if(mcast_sock < 0)
+ usage("Could not setup multicast socket. Wrong args given ?");
+
+ /* Wait for a single datagram from the server (for sync, no check on contain) */
+ peer_addr_len = sizeof(struct sockaddr_storage);
+ nread = recvfrom(mcast_sock, recvbuf, MULTICAST_RECV_BUF, 0, (struct sockaddr *) &peer_addr, &peer_addr_len);
+ if (nread < 0 ) {
+ perror("recvfrom() failed");
+ return -1;
+ }
+ /* Get peer informations as strings from peer_addr */
+ res = getnameinfo((struct sockaddr *) &peer_addr, peer_addr_len,
+ hbuf, NI_MAXHOST, sbuf, NI_MAXSERV, NI_NUMERICSERV);
+ if ( res != 0 ) {
+ fprintf(stderr, "getnameinfo: %s\n", gai_strerror(res));
+ return -2;
+ }
+ /* Connect back to the server, with reliable unicast */
+ if ( ucast_sock > 0 ) {
+ close(ucast_sock);
+ }
+ ucast_sock = ucast_client_socket(hbuf,port);
+ if(ucast_sock < 0) {
+ fprintf(stderr, "Could not setup unicast socket or connect to %s:%s\n", hbuf, port);
+ return -3;
+ }
+
+ return 0;
+}
+
+int wait_start_and_start_job() {
+ ssize_t nread, nwrite;
+
+ /* Wait for a "start" datagram from the server */
+ nread = recvfrom(mcast_sock, recvbuf, MULTICAST_RECV_BUF, 0, NULL, 0);
+ if (nread < 0 ) {
+ perror("recvfrom() failed");
+ return -1;
+ }
+ if ( nread >= 5 && strncmp("start", recvbuf, 5) == 0 ) {
+
+ nwrite = write(ucast_sock, "ready", 5);
+ if ( nwrite < 0 ) {
+ fprintf(stderr, "write() failed\n");
+ return -2;
+ }
+ if (nwrite != 5) {
+ fprintf(stderr, "write() short\n");
+ return -3;
+ }
+
+ return 1;
+ }
+
+ return 0;
+}
+
+int receive_data() {
+ ssize_t nread;
+ uint32_t seq;
+ uint16_t datalen;
+
+ /* Wait for a "dataN" datagram from the server */
+ nread = recvfrom(mcast_sock, recvbuf, MULTICAST_RECV_BUF, 0, NULL, 0);
+ if (nread < 0 ) {
+ perror("recvfrom() failed");
+ return -1;
+ }
+ if ( nread >= 10 && strncmp("data", recvbuf, 4) == 0 ) {
+ seq = ntohl( *( (uint32_t *) recvbuf+1 ) );
+ datalen = ntohs( *( (uint16_t *) recvbuf+4 ) );
+ //fprintf(stderr, "debug seq==%i, datalen==%hi\n", seq, datalen);
+ if ( nread != (10 + datalen) ) {
+ fprintf(stderr, "debug nread==%zi, (10 + datalen)==%i\n", nread, (10 + datalen));
+ //TODO nack ?
+ return -2;
+ }
+ fprintf(stdout, "data #%i, ", seq);
+ fwrite(recvbuf+10, datalen, 1, stdout);
+ fflush(stdout);
+ //TODO buffer zero copy, ack
+ return 1;
+ }
+
+ return 0;
+}
+
+int finalize_job() {
+ return 0;
+}
+int is_there_more_job() {
+ return 1;
+}
+
+
+
+
+void die(char* msg) {
+ fprintf(stderr, "%s\n", msg);
+ if (mcast_sock > 0)
+ close(mcast_sock);
+ if (ucast_sock > 0)
+ close(ucast_sock);
+ exit(EXIT_FAILURE);
+}
+
+void usage(char *msg) {
+ char ubuf[256];
+ if ( msg != NULL )
+ fprintf(stderr, "%s\n", msg);
+ ubuf[0] = '\0';
+ snprintf(ubuf, 255, "Usage: %s [port] [mcast_ip]\n", prog_name);
+ die(ubuf);
+}
+
+void arg_parse(int argc, char* argv[]) {
+ prog_name = argv[0];
+ if ( argc > 3 )
+ usage("Too many arguments");
+ port = (argc >= 2)?argv[1]:DEFAULT_PORT_STR;
+ mcast_ip = (argc >= 3)?argv[2]:DEFAULT_MCAST_IP_STR;
+}
+
diff --git a/mcastseed/src/mcastseed.c b/mcastseed/src/mcastseed.c
new file mode 100644
index 0000000..da73353
--- /dev/null
+++ b/mcastseed/src/mcastseed.c
@@ -0,0 +1,421 @@
+/* server.c
+ * Greatly inspired from examples written by tmouse, July 2005
+ * http://cboard.cprogramming.com/showthread.php?t=67469
+ * Modified to run multi-platform by Christian Beier <dontmind@freeshell.org>.
+ */
+
+#ifndef __MINGW32__
+#include <unistd.h> /* for usleep() */
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include "msock.h"
+
+#define READ_BUF_LEN 256
+#define MAX_PENDING_CONNECTIONS 256
+#define MAX_CLIENTS 256
+#define DEFAULT_MCAST_IP_STR "ff02::114"
+#define DEFAULT_PORT_STR "9000"
+#define DEFAULT_MCAST_TTL 1
+
+/* Cmdline Arguments */
+char *prog_name = NULL;
+char *mcast_ip = NULL;
+char *port = NULL;
+int mcast_ttl = 0;
+
+/* Sockets as global, used everywhere, even in die() */
+SOCKET mcast_sock = (SOCKET) -1; /* Multicast socket for sending data */
+SOCKET ucast_sock = (SOCKET) -1; /* Unicast socket for havee feedback from clients */
+
+/* Socket related data */
+struct addrinfo *mcast_addr = NULL;
+struct client {
+ SOCKET sock;
+ struct sockaddr addr;
+ int state;
+} clients[MAX_CLIENTS];
+int clients_next = 0;
+
+/* Buffer used for earch read() */
+char readbuf[READ_BUF_LEN];
+
+/* Strings to print out representation of various states of the program */
+const char * const state_str[] = {
+ "exiting",
+ "send_hello",
+ "accept_pending_clients_or_wait_a_bit",
+ "start_job",
+ "send_data",
+ "wait_all_finalize_job",
+ "is_there_more_job"
+};
+
+/* Some boring funcs you didn't want to read now */
+void die(char* msg);
+void usage(char *msg);
+void arg_parse(int argc, char* argv[]);
+void unsetup_sockets();
+void setup_sockets();
+
+/* Parts of the "protocol", definitions are after main() */
+int send_hello();
+int accept_pending_clients_or_wait_a_bit();
+int start_job();
+int send_data();
+int wait_all_finalize_job();
+int is_there_more_job();
+
+int main(int argc, char *argv[]) {
+ int state = 1; /* state of the "protocol" state machine */
+ int res;
+ arg_parse(argc, argv);
+ setup_sockets();
+
+ /* Finite state machine */
+ while ( state > 0 ) {
+ fprintf(stderr, "Now in %s state\n", state_str[state]);
+ switch ( state ) {
+ case 1: res = send_hello(); state = (res==0)?2:-1; break;
+ case 2: res = accept_pending_clients_or_wait_a_bit();
+ if (res==0) state = 2; // Some clients has just come in, try to get more
+ else if (res==1) state = 1; // Nothing new. Keep accepting clients after another hello
+ else if (res==2) state = 3; // Wanted clients are accepted
+ else state = -2;
+ break;
+ case 3: res = start_job();
+ if (res==0) state = 3; // Keep trying to convince every client to start
+ else if (res==1) state = 4; // All clients have started the job pipe
+ else if (res==2) state = 4; // There is dead clients but all alive are ready to go
+ else state = -3;
+ break;
+ case 4: res = send_data();
+ if (res==0) state = 4;
+ else if (res==1) state = 5; // All data sent
+ else state = -4;
+ break;
+ case 5: res = wait_all_finalize_job();
+ if (res==0) state = 5;
+ else if (res==1) state = 6;
+ else state = -5;
+ case 6: res = is_there_more_job();
+ if (res==0) state = 0;
+ else if (res==1) state = 3;
+ else state = -6;
+ break;
+ }
+ }
+
+ unsetup_sockets();
+
+ if ( state < 0 )
+ return -state;
+
+ return EXIT_SUCCESS;
+}
+
+int send_hello() {
+ ssize_t nwrite;
+ const char *payload = "hello";
+ int paylen = strlen(payload);
+
+ nwrite = sendto(mcast_sock, payload, paylen, 0, mcast_addr->ai_addr, mcast_addr->ai_addrlen);
+ if ( nwrite < 0 ) {
+ perror("sendto() failed");
+ return -1;
+ }
+ if ( nwrite < paylen ) {
+ fprintf(stderr, "%s", "Short packet sent");
+ }
+
+ return 0;
+}
+
+int accept_pending_clients_or_wait_a_bit() {
+ struct timeval timeout;
+ fd_set readfds, exceptfds;
+ ssize_t nread;
+ int res;
+
+ FD_ZERO(&readfds);
+ FD_ZERO(&exceptfds);
+ FD_SET(0,&readfds); // Read from stdin. Will never work as is on Windows, requires threads and so.
+ FD_SET(ucast_sock,&readfds);
+ FD_SET(ucast_sock,&exceptfds);
+ timeout.tv_sec = 2;
+ timeout.tv_usec = 0;
+
+ res = select(ucast_sock+1, &readfds, NULL, &exceptfds, &timeout);
+ if ( res < 0 ) {
+ perror("select() failed");
+ return -1;
+ }
+
+ if ( res > 0 ) {
+ if (FD_ISSET(ucast_sock, &readfds)) {
+ //TODO : this assumes that the event is an accept() while ones could be send data there
+ if ( clients_next >= MAX_CLIENTS ) {
+ fprintf(stderr, "%s\n", "Bouncing client, MAX_CLIENTS reached");
+ close(accept(ucast_sock, NULL, 0));
+ } else {
+ socklen_t addrlen = sizeof(struct sockaddr);
+ clients[clients_next].sock = accept(ucast_sock, &(clients[clients_next].addr), &addrlen);
+ clients[clients_next].state = 0;
+ printf("Connected client on fd %i\n", clients[clients_next].sock);
+ clients_next++;
+ }
+ }
+ //TODO : drop this keybord read with accept(), this is not portable
+ if ( FD_ISSET(0, &readfds)) {
+ nread = read(0, readbuf, READ_BUF_LEN);
+ if ( nread <= 0 ) {
+ fprintf(stderr, "%s\n", "lost stdin");
+ }
+ // User wants to go now
+ return 2;
+ }
+ if (FD_ISSET(ucast_sock, &exceptfds)) {
+ fprintf(stderr, "%s\n", "unhandled except on ucast_sock");
+ return -2;
+ }
+ }
+ if (res == 0 ) {
+ // nothing happened before timeout
+ return 1;
+ }
+ return 0;
+}
+
+int start_job() {
+ struct timeval timeout;
+ fd_set readfds, exceptfds;
+ ssize_t nread, nwrite;
+ int all_ready, all_non_dead_ready;
+ int i, res;
+ SOCKET client_sock;
+ const char *payload = "start";
+ int paylen = strlen(payload);
+
+ nwrite = sendto(mcast_sock, payload, paylen, 0, mcast_addr->ai_addr, mcast_addr->ai_addrlen);
+ if ( nwrite < 0 ) {
+ perror("sendto() failed");
+ return -1;
+ }
+ if ( nwrite < paylen ) {
+ fprintf(stderr, "%s", "Short packet sent");
+ }
+
+ all_ready = 1;
+ all_non_dead_ready = 1;
+
+ FD_ZERO(&readfds);
+ FD_ZERO(&exceptfds);
+ for ( i=0; i<clients_next; i++) {
+ FD_SET(clients[i].sock,&readfds);
+ FD_SET(clients[i].sock,&exceptfds);
+ }
+ timeout.tv_sec = 2;
+ timeout.tv_usec = 0;
+ res = select(clients_next, &readfds, NULL, &exceptfds, &timeout);
+ if ( res < 0 ) {
+ perror("select() failed");
+ return -1;
+ }
+
+ if ( res > 0 ) {
+ for ( i=0; i<clients_next; i++) {
+ client_sock = clients[i].sock;
+ if (FD_ISSET(client_sock, &readfds)) {
+ printf("todo info from client %i\n", i);
+ nread = read(client_sock, readbuf, 5);
+ if ( nread <= 0 ) {
+ fprintf(stderr, "lost client %i\n", i);
+ clients[i].state = 2;
+ } else if ( nread < 5 ) {
+ fprintf(stderr, "short data from %i\n", i);
+ clients[i].state = 2;
+ } else if ( strncmp("ready", readbuf, 5) != 0 ) {
+ fprintf(stderr, "unexpected data from %i\n", i);
+ clients[i].state = 2;
+ } else {
+ // Received "ready" ack from client
+ clients[i].state = 1;
+ }
+ }
+ if (FD_ISSET(clients[i].sock, &exceptfds)) {
+ fprintf(stderr, "unhandled except on client %i\n", i);
+ clients[i].state = 2;
+ }
+ all_ready &= (clients[i].state == 1);
+ if ( clients[i].state != 2)
+ all_non_dead_ready &= (clients[i].state == 1);
+ }
+ }
+ // (res == 0 ) nothing happened before timeout
+
+ if ( all_ready )
+ return 1;
+ if ( all_non_dead_ready )
+ return 2;
+
+ return 0;
+}
+
+
+int send_data() {
+ ssize_t nwrite;
+ char buf[] = "dataXXXXXXJe suis à la plage.";
+ int paylen = strlen(buf)-10;
+ int seq = 1;
+
+ //FIXME use http://troydhanson.github.io/tpl/index.html
+ *( (uint32_t *) buf+1 ) = htonl(seq);
+ *( (uint16_t *) buf+4 ) = htons(paylen);
+
+ nwrite = sendto(mcast_sock, buf, 10+paylen, 0, mcast_addr->ai_addr, mcast_addr->ai_addrlen);
+ if ( nwrite < 0 ) {
+ perror("sendto() failed");
+ return -1;
+ }
+ if ( nwrite < paylen ) {
+ fprintf(stderr, "%s", "Short packet sent");
+ }
+
+ return 1;
+}
+
+
+int wait_all_finalize_job() {
+ struct timeval timeout;
+ fd_set readfds, exceptfds;
+ ssize_t nread, nwrite;
+ int all_non_dead_done;
+ int i, res;
+ SOCKET client_sock;
+ const char *payload = "final";
+ int paylen = strlen(payload);
+
+ nwrite = sendto(mcast_sock, payload, paylen, 0, mcast_addr->ai_addr, mcast_addr->ai_addrlen);
+ if ( nwrite < 0 ) {
+ perror("sendto() failed");
+ return -1;
+ }
+ if ( nwrite < paylen ) {
+ fprintf(stderr, "%s", "Short packet sent");
+ }
+
+ all_non_dead_done = 1;
+
+ FD_ZERO(&readfds);
+ FD_ZERO(&exceptfds);
+ for ( i=0; i<clients_next; i++) {
+ FD_SET(clients[i].sock,&readfds);
+ FD_SET(clients[i].sock,&exceptfds);
+ }
+ timeout.tv_sec = 2;
+ timeout.tv_usec = 0;
+ res = select(clients_next, &readfds, NULL, &exceptfds, &timeout);
+ if ( res < 0 ) {
+ perror("select() failed");
+ return -1;
+ }
+
+ if ( res > 0 ) {
+ for ( i=0; i<clients_next; i++) {
+ client_sock = clients[i].sock;
+ if (FD_ISSET(client_sock, &readfds)) {
+ printf("todo info from client %i\n", i);
+ nread = read(client_sock, readbuf, 5);
+ if ( nread <= 0 ) {
+ fprintf(stderr, "lost client %i\n", i);
+ clients[i].state = 2;
+ } else if ( nread < 5 ) {
+ fprintf(stderr, "short data from %i\n", i);
+ clients[i].state = 2;
+ } else if ( strncmp("done.", readbuf, 5) != 0 ) {
+ fprintf(stderr, "unexpected data from %i\n", i);
+ clients[i].state = 2;
+ } else {
+ // Received "done." ack from client
+ clients[i].state = 3;
+ }
+ }
+ if (FD_ISSET(clients[i].sock, &exceptfds)) {
+ fprintf(stderr, "unhandled except on client %i\n", i);
+ clients[i].state = 2;
+ }
+ if ( clients[i].state != 2)
+ all_non_dead_done &= (clients[i].state == 3);
+ }
+ }
+ // (res == 0 ) nothing happened before timeout
+
+ if ( all_non_dead_done )
+ return 1;
+
+ return 0;
+}
+
+
+int is_there_more_job() {
+ return 0;
+}
+
+
+void die(char* msg) {
+ fprintf(stderr, "%s\n", msg);
+ if (mcast_sock > 0)
+ close(mcast_sock);
+ if (ucast_sock > 0)
+ close(ucast_sock);
+ exit(EXIT_FAILURE);
+}
+
+void usage(char *msg) {
+ char ubuf[256];
+ if ( msg != NULL )
+ fprintf(stderr, "%s\n", msg);
+ ubuf[0] = '\0';
+ snprintf(ubuf, 255, "Usage: %s [port] [mcast_ip] [mcast_ttl]\n", prog_name);
+ die(ubuf);
+}
+
+void arg_parse(int argc, char* argv[]) {
+ prog_name = argv[0];
+ if ( argc > 3 )
+ usage("Too many arguments");
+ port = (argc >= 2)?argv[1]:DEFAULT_PORT_STR;
+ mcast_ip = (argc >= 3)?argv[2]:DEFAULT_MCAST_IP_STR;
+ mcast_ttl = (argc >= 4)?atoi(argv[3]):DEFAULT_MCAST_TTL;
+ if ( mcast_ttl < 1 || mcast_ttl > 64 )
+ mcast_ttl = 1;
+}
+
+void unsetup_sockets() {
+ if ( ucast_sock > 0 ) {
+ close(ucast_sock);
+ ucast_sock = 0;
+ }
+
+ if ( mcast_sock > 0 ) {
+ close(mcast_sock);
+ mcast_sock = 0;
+ if ( mcast_addr ) {
+ freeaddrinfo(mcast_addr);
+ mcast_addr = 0;
+ }
+ }
+}
+
+void setup_sockets() {
+ /* Setup ucast_sock */
+ ucast_sock = ucast_server_socket(port, MAX_PENDING_CONNECTIONS);
+ if(ucast_sock < 0)
+ usage("Could not setup unicast socket. Wrong args given ?");
+
+ /* Setup mcast_sock */
+ mcast_sock = mcast_send_socket(mcast_ip, port, mcast_ttl, &mcast_addr);
+ if(mcast_sock < 0)
+ usage("Could not setup multicast socket. Wrong args given ?");
+}
+
diff --git a/mcastseed/src/msock.c b/mcastseed/src/msock.c
new file mode 100644
index 0000000..8274710
--- /dev/null
+++ b/mcastseed/src/msock.c
@@ -0,0 +1,371 @@
+/*
+ msock.c - multicast socket creation routines
+
+ (C) 2016 Christian Beier <dontmind@sdf.org>
+
+*/
+
+#ifndef __MINGW32__
+#include <unistd.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include "msock.h"
+
+SOCKET mcast_send_socket(char* multicastIP, char* multicastPort, int multicastTTL, struct addrinfo **multicastAddr) {
+
+ SOCKET sock;
+ struct addrinfo hints = { 0 }; /* Hints for name lookup */
+
+
+#ifdef WIN32
+ WSADATA trash;
+ if(WSAStartup(MAKEWORD(2,0),&trash)!=0)
+ DieWithError("Couldn't init Windows Sockets\n");
+#endif
+
+
+ /*
+ Resolve destination address for multicast datagrams
+ */
+ hints.ai_family = PF_UNSPEC;
+ hints.ai_socktype = SOCK_DGRAM;
+ hints.ai_flags = AI_NUMERICHOST;
+ int status;
+ if ((status = getaddrinfo(multicastIP, multicastPort, &hints, multicastAddr)) != 0 )
+ {
+ fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status));
+ return -1;
+ }
+
+
+
+ /*
+ Create socket for sending multicast datagrams
+ */
+ if ( (sock = socket((*multicastAddr)->ai_family, (*multicastAddr)->ai_socktype, 0)) < 0 ) {
+ perror("socket() failed");
+ freeaddrinfo(*multicastAddr);
+ return -1;
+ }
+
+ /*
+ Set TTL of multicast packet
+ */
+ if ( setsockopt(sock,
+ (*multicastAddr)->ai_family == PF_INET6 ? IPPROTO_IPV6 : IPPROTO_IP,
+ (*multicastAddr)->ai_family == PF_INET6 ? IPV6_MULTICAST_HOPS : IP_MULTICAST_TTL,
+ (char*) &multicastTTL, sizeof(multicastTTL)) != 0 ) {
+ perror("setsockopt() failed");
+ freeaddrinfo(*multicastAddr);
+ return -1;
+ }
+
+
+ /*
+ set the sending interface
+ */
+ if((*multicastAddr)->ai_family == PF_INET) {
+ in_addr_t iface = INADDR_ANY; /* well, yeah, any */
+ if(setsockopt (sock,
+ IPPROTO_IP,
+ IP_MULTICAST_IF,
+ (char*)&iface, sizeof(iface)) != 0) {
+ perror("interface setsockopt() sending interface");
+ freeaddrinfo(*multicastAddr);
+ return -1;
+ }
+
+ }
+ if((*multicastAddr)->ai_family == PF_INET6) {
+ unsigned int ifindex = 0; /* 0 means 'default interface'*/
+ if(setsockopt (sock,
+ IPPROTO_IPV6,
+ IPV6_MULTICAST_IF,
+ (char*)&ifindex, sizeof(ifindex)) != 0) {
+ perror("interface setsockopt() sending interface");
+ freeaddrinfo(*multicastAddr);
+ return -1;
+ }
+
+ }
+
+
+ return sock;
+
+}
+
+
+
+SOCKET mcast_recv_socket(char* multicastIP, char* multicastPort, int multicastRecvBufSize) {
+
+ SOCKET sock;
+ struct addrinfo hints = { 0 }; /* Hints for name lookup */
+ struct addrinfo* localAddr = 0; /* Local address to bind to */
+ struct addrinfo* multicastAddr = 0; /* Multicast Address */
+ int yes=1;
+
+#ifdef WIN32
+ WSADATA trash;
+ if(WSAStartup(MAKEWORD(2,0),&trash)!=0)
+ DieWithError("Couldn't init Windows Sockets\n");
+#endif
+
+
+ /* Resolve the multicast group address */
+ hints.ai_family = PF_UNSPEC;
+ hints.ai_flags = AI_NUMERICHOST;
+ int status;
+ if ((status = getaddrinfo(multicastIP, NULL, &hints, &multicastAddr)) != 0) {
+ fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status));
+ goto error;
+ }
+
+
+ /*
+ Get a local address with the same family (IPv4 or IPv6) as our multicast group
+ This is for receiving on a certain port.
+ */
+ hints.ai_family = multicastAddr->ai_family;
+ hints.ai_socktype = SOCK_DGRAM;
+ hints.ai_flags = AI_PASSIVE; /* Return an address we can bind to */
+ if ( getaddrinfo(NULL, multicastPort, &hints, &localAddr) != 0 ) {
+ fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status));
+ goto error;
+ }
+
+
+ /* Create socket for receiving datagrams */
+ if ( (sock = socket(localAddr->ai_family, localAddr->ai_socktype, 0)) < 0 ) {
+ perror("socket() failed");
+ goto error;
+ }
+
+
+
+ /*
+ * Enable SO_REUSEADDR to allow multiple instances of this
+ * application to receive copies of the multicast datagrams.
+ */
+ if (setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char*)&yes,sizeof(int)) == -1) {
+ perror("setsockopt");
+ goto error;
+ }
+
+ /* Bind the local address to the multicast port */
+ if ( bind(sock, localAddr->ai_addr, localAddr->ai_addrlen) != 0 ) {
+ perror("bind() failed");
+ goto error;
+ }
+
+ /* get/set socket receive buffer */
+ int optval=0;
+ socklen_t optval_len = sizeof(optval);
+ int dfltrcvbuf;
+ if(getsockopt(sock, SOL_SOCKET, SO_RCVBUF,(char*)&optval, &optval_len) !=0) {
+ perror("getsockopt");
+ goto error;
+ }
+ dfltrcvbuf = optval;
+ optval = multicastRecvBufSize;
+ if(setsockopt(sock,SOL_SOCKET,SO_RCVBUF,(char*)&optval,sizeof(optval)) != 0) {
+ perror("setsockopt");
+ goto error;
+ }
+ if(getsockopt(sock, SOL_SOCKET, SO_RCVBUF,(char*)&optval, &optval_len) != 0) {
+ perror("getsockopt");
+ goto error;
+ }
+ printf("tried to set socket receive buffer from %d to %d, got %d\n",
+ dfltrcvbuf, multicastRecvBufSize, optval);
+
+
+
+
+ /* Join the multicast group. We do this seperately depending on whether we
+ * are using IPv4 or IPv6.
+ */
+ if ( multicastAddr->ai_family == PF_INET &&
+ multicastAddr->ai_addrlen == sizeof(struct sockaddr_in) ) /* IPv4 */
+ {
+ struct ip_mreq multicastRequest; /* Multicast address join structure */
+
+ /* Specify the multicast group */
+ memcpy(&multicastRequest.imr_multiaddr,
+ &((struct sockaddr_in*)(multicastAddr->ai_addr))->sin_addr,
+ sizeof(multicastRequest.imr_multiaddr));
+
+ /* Accept multicast from any interface */
+ multicastRequest.imr_interface.s_addr = htonl(INADDR_ANY);
+
+ /* Join the multicast address */
+ if ( setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char*) &multicastRequest, sizeof(multicastRequest)) != 0 ) {
+ perror("setsockopt() failed");
+ goto error;
+ }
+ }
+ else if ( multicastAddr->ai_family == PF_INET6 &&
+ multicastAddr->ai_addrlen == sizeof(struct sockaddr_in6) ) /* IPv6 */
+ {
+ struct ipv6_mreq multicastRequest; /* Multicast address join structure */
+
+ /* Specify the multicast group */
+ memcpy(&multicastRequest.ipv6mr_multiaddr,
+ &((struct sockaddr_in6*)(multicastAddr->ai_addr))->sin6_addr,
+ sizeof(multicastRequest.ipv6mr_multiaddr));
+
+ /* Accept multicast from any interface */
+ multicastRequest.ipv6mr_interface = 0;
+
+ /* Join the multicast address */
+ if ( setsockopt(sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, (char*) &multicastRequest, sizeof(multicastRequest)) != 0 ) {
+ perror("setsockopt() failed");
+ goto error;
+ }
+ }
+ else {
+ perror("Neither IPv4 or IPv6");
+ goto error;
+ }
+
+
+
+ if(localAddr)
+ freeaddrinfo(localAddr);
+ if(multicastAddr)
+ freeaddrinfo(multicastAddr);
+
+ return sock;
+
+ error:
+ if(localAddr)
+ freeaddrinfo(localAddr);
+ if(multicastAddr)
+ freeaddrinfo(multicastAddr);
+
+ return -1;
+}
+
+SOCKET ucast_client_socket(char* serverIP, char* serverPort) {
+
+ SOCKET sock;
+ struct addrinfo *serverAddr;
+ struct addrinfo hints = { 0 }; /* Hints for name lookup */
+
+
+#ifdef WIN32
+ WSADATA trash;
+ if(WSAStartup(MAKEWORD(2,0),&trash)!=0)
+ DieWithError("Couldn't init Windows Sockets\n");
+#endif
+
+
+ /*
+ Resolve destination address
+ */
+ hints.ai_family = PF_UNSPEC;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_NUMERICHOST;
+ int status;
+ if ((status = getaddrinfo(serverIP, serverPort, &hints, &serverAddr)) != 0 )
+ {
+ fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status));
+ return -1;
+ }
+
+ /*
+ Create socket
+ */
+ if ( (sock = socket(serverAddr->ai_family, serverAddr->ai_socktype, 0)) < 0 ) {
+ perror("socket() failed");
+ freeaddrinfo(serverAddr);
+ return -1;
+ }
+
+ /*
+ Connect it to the remote server
+ */
+ if ( connect(sock, serverAddr->ai_addr, serverAddr->ai_addrlen) < 0 ) {
+ perror("connect() failed");
+ close(sock);
+ freeaddrinfo(serverAddr);
+ return -1;
+ }
+
+ freeaddrinfo(serverAddr);
+ return sock;
+}
+
+SOCKET ucast_server_socket(char* serverPort, int maxPendingConnections) {
+
+ SOCKET sock;
+ struct addrinfo *serverAddr;
+ struct addrinfo hints = { 0 }; /* Hints for name lookup */
+
+
+#ifdef WIN32
+ WSADATA trash;
+ if(WSAStartup(MAKEWORD(2,0),&trash)!=0)
+ DieWithError("Couldn't init Windows Sockets\n");
+#endif
+
+
+ /*
+ Prepare an addrinfo struct for a local socket
+ */
+ hints.ai_family = PF_INET6;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_PASSIVE;
+ int status;
+ if ((status = getaddrinfo(NULL, serverPort, &hints, &serverAddr)) != 0 )
+ {
+ fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status));
+ return -1;
+ }
+ /*
+ Create socket
+ */
+ if ( (sock = socket(serverAddr->ai_family, serverAddr->ai_socktype, serverAddr->ai_protocol)) < 0 ) {
+ perror("socket() failed");
+ freeaddrinfo(serverAddr);
+ return -1;
+ }
+
+ /*
+ Accepts also IPv4 traffic if the socket is INET6
+ */
+ if(serverAddr->ai_family == PF_INET6) {
+ unsigned int no = 0;
+ if(setsockopt (sock,
+ IPPROTO_IPV6,
+ IPV6_V6ONLY,
+ (char*)&no, sizeof(no)) != 0) {
+ perror("setsockopt() !IPV6_V6ONLY failed");
+ freeaddrinfo(serverAddr);
+ return -1;
+ }
+ }
+
+ /*
+ Bind socket to local address/port
+ */
+ if ( bind(sock, serverAddr->ai_addr, serverAddr->ai_addrlen) < 0 ) {
+ perror("bind() failed");
+ close(sock);
+ freeaddrinfo(serverAddr);
+ return -1;
+ }
+
+ freeaddrinfo(serverAddr);
+ /*
+ Start listening incoming connections
+ */
+ if ( listen(sock, maxPendingConnections) < 0 ) {
+ perror("listen() failed");
+ close(sock);
+ }
+
+ return sock;
+}
diff --git a/mcastseed/src/msock.h b/mcastseed/src/msock.h
new file mode 100644
index 0000000..07e1fad
--- /dev/null
+++ b/mcastseed/src/msock.h
@@ -0,0 +1,74 @@
+/*
+ msock.h - multicast socket creation routines
+
+ (C) 2016 Christian Beier <dontmind@sdf.org>
+
+*/
+
+
+#ifndef MSOCK_H
+#define MSOCK_H
+
+/* this is for windows compat */
+#define SOCKET int
+
+#ifdef __MINGW32__
+#undef SOCKET
+#undef socklen_t
+#define WINVER 0x0501
+#include <ws2tcpip.h>
+#define EWOULDBLOCK WSAEWOULDBLOCK
+#define close closesocket
+#define socklen_t int
+typedef unsigned int in_addr_t;
+#else
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <sys/un.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#endif
+
+/* Define IPV6_ADD_MEMBERSHIP for FreeBSD and Mac OS X */
+#ifndef IPV6_ADD_MEMBERSHIP
+#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
+#endif
+
+
+
+/**
+ Creates a socket suitable for sending multicast datagrams via sendto().
+
+ On success, a socket is returned and multicastAddr set with the right info for sendto() calls.
+ On error, -1 is returned.
+*/
+SOCKET mcast_send_socket(char* multicastIP, char* multicastPort, int multicastTTL, struct addrinfo **multicastAddr);
+
+/**
+ Creates a socket suitable for receiving multicast datagrams via recvfrom(). Also sets socket recv buffer.
+
+ On success, returns socket.
+ On fail, returns -1.
+ */
+SOCKET mcast_recv_socket(char* multicastIP, char* multicastPort, int multicastRecvBufSize);
+
+/**
+ Creates a TCP socket that connects to serverIP:serverPort.
+ Meant to give feedback to a mcast sender.
+
+ On success, returns socket.
+ On error, -1 is returned.
+ */
+SOCKET ucast_client_socket(char* serverIP, char* serverPort);
+
+/**
+ Creates a TCP socket that binds locally serverPort.
+ Meant to receive feedback to a mcast sender.
+
+ On success, returns socket.
+ On error, -1 is returned.
+ */
+SOCKET ucast_server_socket(char* serverPort, int maxPendingConnections);
+
+#endif