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# # Copyright 2008-2012 Pavel V. Cherenkov ([email protected]) # # This file is part of udpxy. # # udpxy 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 3 of the License, or # (at your option) any later version. # # udpxy 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 udpxy. If not, see <https://www.gnu.org/licenses/>. # Summary -------------- udpxy is a UDP-to-HTTP multicast traffic relay daemon: it forwards UDP traffic from a given multicast subscription to the requesting HTTP client. udpxy is released under GPL v.3 Building and installing -------------- Untar the *.tgz source distribution into a directory of your choice by running tar -xzvf udpxy.X.Y-ZZ.tgz or gzip -dc udpxy.X.Y-ZZ.tgz | tar -xvf - Make sure GNU make and gcc are available (gcc 3.x and up should work, lower versions are not guaranteed to build the source correctly); for compilers other than gcc alterations to Makefile might be needed. Running 'make' without a target will build the 'release' version of udpxy (no asserts, no debug symbols, verbose mode on). Other make targets are: debug (asserts, debug symbols, verbose mode on); lean (no asserts, no debug symbols, verbose mode off); rdebug (same as 'release' but with debug symbols); ldebug (same as 'lean' but with debug symbols); Once the make has succeeded, the udpxy executable file could be copied to a location of one's choice and run from there - no additional installation steps are required. udpxy can be started with a number of configuration parameters, such as listening address/port, multicast interface name, etc. A brief usage summary is provided when udpxy is invoked from command line without parameters. HTTP commands -------------- udpxy responds to HTTP (GET) commands to receive data from a dedicated multicast group and forward it to the initiating (HTTP) connection. The command to relay traffic is in the format as below: https://address:port/cmd/mgroup_address[SEP]mgroup_port/ [SEP] ::= :|%|~|+|-|^ i.e: https://ip:port/cmd/mgroup_address:mgroup_port/ https://ip:port/cmd/mgroup_address%mgroup_port/ https://ip:port/cmd/mgroup_address~mgroup_port/ ...... https://ip:port/cmd/mgroup_address^mgroup_port/ are acceptable and should all work in the same manner. cmd ::= udp | rtp where ip and port match the listening address/port combination of udpxy, and mgroup_address:mgroup_port identify the multicast group to subscribe to. Using 'udp' command will instruct udpxy to probe for known types of payload (such as MPEG-TS and RTP over MPEG-TS); using 'rtp' makes udpxy assume RTP over MPEG-TS payload, thus skipping the probes. udpxy will start a 'client' process for each new relay request as long as their number would not exceed a pre-set maximum (see usage summary). udpxy also supports a few additional HTTP requests, such as: https://address:port/status/ - to display basic daemon's statistics https://address:port/restart/ - to close all active connections and restart Payload types and handling -------------- udpxy recognizes MPEG-TS and RTP (over MPEG-TS) payloads within relayed packets; if udpxy encounters RTP payload it automatically 'translates' it to MPEG-TS so that media players not recognizing RTP on TCP could still play back the stream. So far, no translation is performed for other payload types. Recording MPEG traffic -------------- udpxy (in builds >0.33) includes functionality to record captured traffic as raw MPEG-TS stream into a file. This functionality is enabled through udpxrec: a bundled-in application that is linked together with udpxy (as one executable). udpxrec is invoked by a symbolic link (named udpxrec) to the udpxy executable (NB: do not rename udpxy executable). udpxrec creates MPEG files encapsulating MPEG-TS segments; most media players will *NOT* play such files; to make them playable the stream must be transcoded to MPEG-PS; vlc knows how to do such transcoding, here is a command-line example: vlc input-ts.mpg --sout="#std{access=file,mux=ps,dst=out-ps.mpg}" The resulting PS file can be played back by most media players. Portability -------------- udpxy was written to run on 'POSIX-compliant' systems; so far all builds have been tested to build and run on Linux 2.4, 2.6, 3.x (IA32, ARM) and *some* (but not all) on HP-UX 11.11 (PA-RISC 1.1, 2.0w). Build 12 of version 1.0 (Chipmunk) was ported to compile under FreeBSD 7.1 using GNU make 3.8; later builds have been tested to compile under later versions of FreeBSD (up to 9.0); Certain builds have been ported to build under cygwin; cygwin is *NOT* considered to be a fully supported platform yet there is an ongoing effort to make udpxy run on it as well. Environment variables -------------- udpxy utilizes the following environment variables to compliment its command-line options; the variables are considered for the options that most people would not need to change too often (or simply inconvenient to use from the command line). NB: If there is a command-line switch that would intersect in functionality with an environment variable, the switch *always* has the higher priority. UDPXY_RCV_TMOUT - timeout (sec) on the inbound data stream (multicast), default=5; UDPXY_DHOLD_TMOUT - timeout (sec) to hold buffered data before sending/flushing to client(s), default=1; UDPXY_SREAD_TMOUT - timeout (sec) to read from the listening socked (handling HTTP requests), default=1; UDPXY_SWRITE_TMOUT - timeout (sec) to write to the listening socked (handling HTTP requests), default=1; UDPXY_SSEL_TMOUT - timeout (sec) to select(2) in server loop (unused if pselect(2) is employed), default=30; UDPXY_LQ_BACKLOG - size of the listener socket's backlog, default=16; UDPXY_SRV_RLWMARK - low watermaek on the receiving (m-cast) socket, default=0 (not set); UDPXY_SSOCKBUF_NOSYNC - do not sync inbound (UDP) socket's buffer size (with value set by -B), default=1 (sync); UDPXY_DSOCKBUF_NOSYNC - do not sync outbound (TCP) socket's buffer size (with value set by -B), default=1 (sync); UDPXY_TCP_NODELAY - disable Nagle algorithm on the newly accepted socket (faster channel switching), default=1; UDPXY_HTTP200_FTR_FILE - append contents of the given file to the HTTP 200 response, default=none; UDPXY_HTTP200_FTR_LN - append the text (line) to the HTTP 200 response, default=none; UDPXY_ALLOW_PAUSES - if blocked on a write, keep reading data until the buffer (-B size) is full, default=disabled; UDPXY_PAUSE_MSEC - allow only N milliseconds of reading data when blocked on a write. --EOF--
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UDPXY clone, but limited to only one multicast ip address, defined in startup parameters -J option like ./udpxy -J 239.255.255.1:30000 -p 8080
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