diff --git a/ChangeLog b/ChangeLog index 2d4827e..1274317 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,9 +1,17 @@ +0.1.2 +===== +- 7-Sep-2002: Releases version 0.1.2 + Experimental RTP proxying feature (using pthreads) +- 26-Aug-2002: Optimized DNS caching 0.1.1 ===== +- 25-Aug-2002: Released version 0.1.1 + can daemonize (detach and run in background) + do some DNS caching - 24-Aug-2002: Imlemented support for a config file, obsoletes siproxd_conf.h 0.1.0 ===== -- 19-Aug-2002: Released version 0.1.0 +- 19-Aug-2002: Released version 0.1.0 diff --git a/README b/README index e5020fa..27d3e8b 100644 --- a/README +++ b/README @@ -1,8 +1,7 @@ Be warned, this (and all the other) documentantation is far from -complete. This is just a *very* preliminary pre-alpha release. Don't -expect anything! +complete. This is still considered an alpha release. Overview: @@ -26,7 +25,7 @@ Requirements: - libosip-0.8.8 (http://www.fsf.org/software/osip/) Up to now, this packages only has been tested under an i386 Redhat Linux 6.0. -However, it should build and run under newer versions. +However, it should build and run under newer versions (feedback is welcome). @@ -49,25 +48,41 @@ How to get started: here and use a dynamic DNS service like dyndns.org) + What siproxd does: ================= -Siproxd's main purpose (up to now) is to rewrite SIP messages. +Siproxd's main purpose (up to now) is to rewrite SIP messages +to be able to operate via an masquerading firewall. +Since release 0.1.2 siproxd can proxy incomming RTP streams. What siproxd does NOT do: ========================= -Siproxd does *not* (yet) create masquerading tunnels or port-forwarding -for the data stream through the firewall. -These forwarding rules have to be set-up manually. +SINCE RELEASE 0.1.2: + Siproxd should be able to proxy incomming RTP data streams (UDP only). + This is still very experimental code ;-) + The config parameters 'rtp_port_low' and rtp_port_high' define + the port range that siproxd will use for incomming RTP data streams. + 'rtp_timeout' defines after what time an unused (no data received) + rtp stream is considered dead and removed. + + ** As I had not yet the possibility to test this feature, + ** I'd be glad about feedback. -Example, using ipchains (mfw): -# ipchains -A input --proto udp --dport 7078 -m 100 -j ACCEPT -# ipmasqadm mfw -A -m 100 -r 7078 +PRIOR TO RELEASE 0.1.2: + Siproxd does *not* (yet) create masquerading tunnels or port-forwarding + for the data stream through the firewall. -Example, using ipchains (portfw): -# portfw -a -P udp -L 7078 -R 7078 + These forwarding rules have to be set-up manually (currently) + + Example, using ipchains (mfw): + # ipchains -A input --proto udp --dport 7078 -m 100 -j ACCEPT + # ipmasqadm mfw -A -m 100 -r 7078 + + Example, using ipchains (portfw): + # portfw -a -P udp -L 7078 -R 7078 @@ -80,17 +95,23 @@ Limitations: Important Notice: ================= -gethostbyname() leaks memory in RedHat 6.0 with glibc 2.1.1. - The gethostbyname() function leaks memory in RedHat 6.0 with glibc 2.1.1. The quick fix is to delete nisplus service from hosts entry in -/etc/nsswitch.conf. In my tests, memory use remained stable -after I made the above change. -(->http://www.squid-cache.org/Doc/FAQ/FAQ-14.html) +/etc/nsswitch.conf. In my tests, memory use remained stable after I +made the mentioned change. +(source: http://www.squid-cache.org/Doc/FAQ/FAQ-14.html) Contacts: ========= +Please feel free to contact the author to: + - provide feedback + - report bugs, + - request for additional features + - report interoperability with softphones + - ... + +and visit the website at http://siproxd.sourceforge.net/ Thomas Ries (tries@gmx.net) GnuPG Public Key: diff --git a/TODO b/TODO index d63741e..5663787 100644 --- a/TODO +++ b/TODO @@ -13,3 +13,6 @@ TODOs, in anarchistic order: - logging via syslog if running in daemon mode - get_ip_by_host: reduce DNS timeouts + +- forwarding(proxying) of incomming RTP media streams + ? own thread/process (is pending) diff --git a/config.h.in b/config.h.in index 59db064..c0a79ba 100644 --- a/config.h.in +++ b/config.h.in @@ -48,6 +48,9 @@ /* Define if you have the osip library (-losip). */ #undef HAVE_LIBOSIP +/* Define if you have the pthread library (-lpthread). */ +#undef HAVE_LIBPTHREAD + /* Name of package */ #undef PACKAGE diff --git a/configure b/configure deleted file mode 100755 index 9a4fa39..0000000 --- a/configure +++ /dev/null @@ -1,2192 +0,0 @@ -#! /bin/sh - -# Guess values for system-dependent variables and create Makefiles. -# Generated automatically using autoconf version 2.13 -# Copyright (C) 1992, 93, 94, 95, 96 Free Software Foundation, Inc. -# -# This configure script is free software; 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Not all systems have dirname. - ac_dir=`echo $ac_file|sed 's%/[^/][^/]*$%%'` - if test "$ac_dir" != "$ac_file" && test "$ac_dir" != .; then - # The file is in a subdirectory. - test ! -d "$ac_dir" && mkdir "$ac_dir" - fi - rm -f $ac_file - mv conftest.h $ac_file - fi -fi; done - -EOF -cat >> $CONFIG_STATUS <> $CONFIG_STATUS <<\EOF -test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h - -exit 0 -EOF -chmod +x $CONFIG_STATUS -rm -fr confdefs* $ac_clean_files -test "$no_create" = yes || ${CONFIG_SHELL-/bin/sh} $CONFIG_STATUS || exit 1 - diff --git a/configure.in b/configure.in index 2e82a38..56cbbd8 100644 --- a/configure.in +++ b/configure.in @@ -5,7 +5,7 @@ dnl ****************************************************************** dnl SPD_MAJOR_VERSION=0 SPD_MINOR_VERSION=1 -SPD_MICRO_VERSION=1 +SPD_MICRO_VERSION=2 SPD_VERSION=$SPD_MAJOR_VERSION.$SPD_MINOR_VERSION.$SPD_MICRO_VERSION dnl ********************************************************************* @@ -22,6 +22,7 @@ AC_PROG_LN_S dnl Checks for libraries. AC_CHECK_LIB(osip, parser_init) +AC_CHECK_LIB(pthread, pthread_create) dnl Checks for header files. AC_HEADER_STDC diff --git a/doc/siproxd.conf.example b/doc/siproxd.conf.example index 3203c7b..6ec439a 100644 --- a/doc/siproxd.conf.example +++ b/doc/siproxd.conf.example @@ -14,7 +14,9 @@ # DBCLASS_DNS 0x00000040 // DNS stuff # DBCLASS_NETTRAF 0x00000080 // network traffic # DBCLASS_CONFIG 0x00000100 // configuration -debug_level = 0x0ffffffe +# DBCLASS_RTP 0x00000200 // RTP proxy +# +debug_level = 0x000002fe ###################################################################### # The IP addresses of the INBOUND and OUTBOUND interface can @@ -25,8 +27,8 @@ debug_level = 0x0ffffffe # or as dotted decimal IP: # # host_inbound=10.0.0.1 - -host_inbound = 192.168.1.8 +# +host_inbound = 192.168.1.1 host_outbound = ries.homeip.net @@ -34,11 +36,31 @@ host_outbound = ries.homeip.net # Port to listen for incomming SIP messages. # 5060 is usually the correct choise - don't change is unless you # know what you're doing - -sip_port = 5060 +# +sip_listen_port = 5060 ###################################################################### # Shall we daemonize? +# daemonize = 0 +###################################################################### +# global switch to enable (1) or disable (0) the RTP proxy feature +# +rtp_proxy_enable = 1 + +###################################################################### +# Port range where to allocate listen ports for incomming RTP traffic +# this should be a range that is not blocked by the firewall +# +rtp_port_low = 7070 +rtp_port_high = 7080 + +###################################################################### +# Timeout for RTP streams +# after this number of seconds, at RTP stream is considered dead +# and proxying it will be stopped. +# +rtp_timeout = 60 + diff --git a/src/Makefile.am b/src/Makefile.am index a614dd8..3c69bf5 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -19,11 +19,11 @@ # -CFLAGS =@CFLAGS@ -Wall -DBUILDSTR=\"`cat .buildno`\" +CFLAGS =@CFLAGS@ -Wall -DBUILDSTR=\"`cat .buildno`\" -D_GNU_SOURCE bin_PROGRAMS = siproxd siproxd_SOURCES = siproxd.c proxy.c register.c sock.c utils.c \ - log.c readconf.c + log.c readconf.c rtpproxy.c noinst_HEADERS = log.h siproxd.h diff --git a/src/Makefile.in b/src/Makefile.in index 0a24f2b..a6de925 100644 --- a/src/Makefile.in +++ b/src/Makefile.in @@ -85,10 +85,10 @@ MAKEINFO = @MAKEINFO@ PACKAGE = @PACKAGE@ VERSION = @VERSION@ -CFLAGS = @CFLAGS@ -Wall -DBUILDSTR=\"`cat .buildno`\" +CFLAGS = @CFLAGS@ -Wall -DBUILDSTR=\"`cat .buildno`\" -D_GNU_SOURCE bin_PROGRAMS = siproxd -siproxd_SOURCES = siproxd.c proxy.c register.c sock.c utils.c log.c readconf.c +siproxd_SOURCES = siproxd.c proxy.c register.c sock.c utils.c log.c readconf.c rtpproxy.c noinst_HEADERS = log.h siproxd.h @@ -105,7 +105,7 @@ CPPFLAGS = @CPPFLAGS@ LDFLAGS = @LDFLAGS@ LIBS = @LIBS@ siproxd_OBJECTS = siproxd.o proxy.o register.o sock.o utils.o log.o \ -readconf.o +readconf.o rtpproxy.o siproxd_LDADD = $(LDADD) siproxd_DEPENDENCIES = siproxd_LDFLAGS = @@ -122,7 +122,7 @@ DISTFILES = $(DIST_COMMON) $(SOURCES) $(HEADERS) $(TEXINFOS) $(EXTRA_DIST) TAR = gtar GZIP_ENV = --best DEP_FILES = .deps/log.P .deps/proxy.P .deps/readconf.P .deps/register.P \ -.deps/siproxd.P .deps/sock.P .deps/utils.P +.deps/rtpproxy.P .deps/siproxd.P .deps/sock.P .deps/utils.P SOURCES = $(siproxd_SOURCES) OBJECTS = $(siproxd_OBJECTS) diff --git a/src/log.h b/src/log.h index 5069fd5..c5555a4 100644 --- a/src/log.h +++ b/src/log.h @@ -29,6 +29,7 @@ #define DBCLASS_DNS 0x00000040 // DNS stuff #define DBCLASS_NETTRAF 0x00000080 // network traffic #define DBCLASS_CONFIG 0x00000100 // configuration +#define DBCLASS_RTP 0x00000200 // RTP proxy #define DEBUG(F...) log_debug(1,__FILE__, __LINE__,F) diff --git a/src/proxy.c b/src/proxy.c index 394971d..d5d6342 100644 --- a/src/proxy.c +++ b/src/proxy.c @@ -29,6 +29,7 @@ #include #include +#include #include "siproxd.h" #include "log.h" @@ -45,9 +46,15 @@ extern struct siproxd_config configuration; */ extern int errno; -extern struct urlmap_s urlmap[]; // URL mapping table +extern struct urlmap_s urlmap[]; /* URL mapping table */ extern struct lcl_if_s local_addresses; +extern int sip_socket; /* sending SIP datagrams */ + +/* + * PROXY_REQUEST + * + */ int proxy_request (sip_t *request) { int i; int sts; @@ -125,6 +132,13 @@ int proxy_request (sip_t *request) { /* add my Via header line (inbound interface)*/ sts = proxy_add_myvia(request, 1); + + /* if this is CANCEL/BYE request, stop RTP proxying */ + if (MSG_IS_BYE(request) || MSG_IS_CANCEL(request)) { + /* stop the RTP proxying stream */ + sts = rtp_stop_fwd(msg_getcall_id(request)); + } + break; /* @@ -138,6 +152,13 @@ int proxy_request (sip_t *request) { /* add my Via header line (outbound interface)*/ sts = proxy_add_myvia(request, 0); + + /* if this is CANCEL/BYE request, stop RTP proxying */ + if (MSG_IS_BYE(request) || MSG_IS_CANCEL(request)) { + /* stop the RTP proxying stream */ + sts = rtp_stop_fwd(msg_getcall_id(request)); + } + break; default: @@ -192,12 +213,16 @@ int proxy_request (sip_t *request) { port=configuration.sip_listen_port; } - sipsock_send_udp(addr, port, buffer, strlen(buffer)); + sipsock_send_udp(&sip_socket, addr, port, buffer, strlen(buffer), 1); free (buffer); return 0; } +/* + * PROXY_RESPONSE + * + */ int proxy_response (sip_t *response) { int i; int sts; @@ -271,7 +296,7 @@ int proxy_response (sip_t *response) { */ case RESTYP_INCOMMING: #if 0 /* do we really have to?? in the incomming response - we have the correct address. But we mus rewrite an + we have the correct address. But we must rewrite an outgoing response to an incomming INVITE request ! */ /* If an 200 answer to an INVITE request, rewrite body */ if ((MSG_IS_RESPONSEFOR(response,"INVITE") && @@ -319,18 +344,15 @@ int proxy_response (sip_t *response) { port=configuration.sip_listen_port; } - sipsock_send_udp(addr, port, buffer, strlen(buffer)); + sipsock_send_udp(&sip_socket, addr, port, buffer, strlen(buffer), 1); free (buffer); return 0; } - - - - - /* + * PROXY_GEN_RESPONSE + * * send an proxy generated response back to the client. * Only errors are reported from the proxy itself. * code = SIP result code to deliver @@ -373,7 +395,8 @@ DEBUGC(DBCLASS_PROXY,"response=%p",response); } /* send to destination */ - sipsock_send_udp(addr, atoi(via->port), buffer, strlen(buffer)); + sipsock_send_udp(&sip_socket, addr, atoi(via->port), + buffer, strlen(buffer), 1); /* free the resources */ msg_free(response); @@ -384,10 +407,11 @@ DEBUGC(DBCLASS_PROXY,"response=%p",response); /* - * routine to rewrite the header and message bodies + * PROXY_ADD_MYVIA + * + * + * interface == 0 -> outbound interface, else inbound interface */ - -/* interface == 0 -> outbound interface, else inbound interface */ int proxy_add_myvia (sip_t *request, int interface) { struct in_addr addr; char tmp[URL_STRING_SIZE]; @@ -414,7 +438,10 @@ int proxy_add_myvia (sip_t *request, int interface) { } - +/* + * PROXY_DEL_MYVIA + * + */ int proxy_del_myvia (sip_t *response) { via_t *via; int sts; @@ -434,14 +461,19 @@ int proxy_del_myvia (sip_t *response) { } - +/* + * PROXY_REWRITE_INVITATION_BODY + * + */ int proxy_rewrite_invitation_body(sip_t *mymsg){ body_t *body; - struct in_addr addr; + sdp_t *sdp; + struct in_addr outb_addr, lcl_clnt_addr; int sts; char *oldbody; char newbody[BODY_MESSAGE_MAX_SIZE]; - char clen[8]; /* probably never more than 7 digits for content length !*/ + char clen[8]; /* content length: probably never more than 7 digits !*/ + int outb_rtp_port, inb_clnt_port; sts = msg_getbody(mymsg, 0, &body); if (sts != 0) { @@ -451,7 +483,14 @@ int proxy_rewrite_invitation_body(sip_t *mymsg){ sts = body_2char(body, &oldbody); -{ + sts = sdp_init(&sdp); + sts = sdp_parse (sdp, oldbody); + if (sts != 0) { + ERROR("rewrite_invitation_body: unable to sdp_parse body"); + return 1; + } + +{ /* just dump the buffer */ char *tmp2; content_length_2char(mymsg->contentlength, &tmp2); DEBUG("Body before rewrite (clen=%s, strlen=%i):\n%s\n----", @@ -460,60 +499,141 @@ int proxy_rewrite_invitation_body(sip_t *mymsg){ } -/* TODO */ -/* - change the 'c=' line to present the outbound address (the other - side will send its audio data there - - 'm=' line: here we should change the port number to a free local - (outbound) port and set up an port forwarding to the hidden - inbound client ...*/ + /* + * RTP proxy: get ready and start forwarding + */ + sts = get_ip_by_host(sdp_c_addr_get(sdp,-1,0), &lcl_clnt_addr); + sts = get_ip_by_host(configuration.outboundhost, &outb_addr); + inb_clnt_port = atoi(sdp_m_port_get(sdp,0)); + /* start an RTP proxying stream */ + sts = rtp_start_fwd(msg_getcall_id(mymsg), + outb_addr, &outb_rtp_port, + lcl_clnt_addr, inb_clnt_port); +/* + * yup, I know - here are some HARDCODED strings that we + * search for in the connect information and media description + * in the SDP part of the INVITE packet + * + * TODO: redo the rewriting section below, + * using the nice sdp_ routines of libosip! + * + * Up to now, also only ONE incomming media port per session + * is supported! I guess, there may be more allowed. + */ { - char *data=NULL; - char *data2=NULL; + char *data_c=NULL; /* connection information 'c=' line*/ + char *data_m=NULL; /* media description 'm=' line*/ + char *data2_c=NULL; /* end of IP address on 'c=' line */ + char *data2_m=NULL; /* end of port number on 'm=' line */ char *ptr=NULL; memset(newbody, 0, sizeof(newbody)); - data = strstr (oldbody, "\nc="); - if (data == NULL) data = strstr (oldbody, "\rc="); - if (data == NULL) { + /* + * find where to patch connection information (IP address) + */ + data_c = strstr (oldbody, "\nc="); + if (data_c == NULL) data_c = strstr (oldbody, "\rc="); + if (data_c == NULL) { ERROR("did not find a c= line in the body"); return 1; } - data += 3; - + data_c += 3; /* can only rewrite IPV4 addresses by now */ - if (strncmp(data,"IN IP4 ",7)!=0) { + if (strncmp(data_c,"IN IP4 ",7)!=0) { ERROR("c= does not contain an IN IP4 address"); return 1; } - data += 7; - - data2 = strstr (data, "\n"); - if (data2 == NULL) data2 = strstr (oldbody, "\r"); - if (data2 == NULL) { + data_c += 7; /* PTR to start of IP address */ + /* find the end of the IP address -> end of line */ + data2_c = strstr (data_c, "\n"); + if (data2_c == NULL) data2_c = strstr (oldbody, "\r"); + if (data2_c == NULL) { ERROR("did not find a CR/LF after c= line"); return 1; } - /* copy up to the to-be-masqueraded address */ - memcpy(newbody, oldbody, data-oldbody); + /* + * find where to patch media description (port number) + */ + data_m = strstr (oldbody, "\nm="); + if (data_m == NULL) data_m = strstr (oldbody, "\rm="); + if (data_m == NULL) { + ERROR("did not find a m= line in the body"); + return 1; + } + data_m += 3; + /* check for audio media */ + if (strncmp(data_m,"audio ",6)!=0) { + ERROR("m= does not contain audio"); + return 1; + } + data_m += 6; /* PTR to start of port number */ + /* find the end of the IP address -> end of line */ + data2_m = strstr (data_m, " RTP/"); + if (data2_m == NULL) { + ERROR("did not find RTP/ on m= line"); + return 1; + } + + /* + * what is first? c= or m= ? + * (Im sure this can be made nicer) + */ + if (data_c < data_m) { + DEBUGC(DBCLASS_PROXY,"c= before m="); + /* + * c= line first, replace IP address, then port + */ + /* copy up to the to-be-masqueraded address */ + memcpy(newbody, oldbody, data_c-oldbody); + /* insert proxy outbound address */ + ptr=newbody+(data_c-oldbody); + sprintf(ptr, "%s", inet_ntoa(outb_addr)); + ptr += strlen(ptr); + /* copy up to the m= line */ + memcpy (ptr, data2_c, data_m-data2_c); + ptr += strlen(ptr); + /* substitute port number */ + sprintf(ptr, "%i", outb_rtp_port); + ptr += strlen(ptr); + /* copy the rest */ + memcpy (ptr, data2_m, strlen(data2_m)); + } else { + DEBUGC(DBCLASS_PROXY,"m= before c="); + /* + * m= line first, replace port, then IP address + */ + /* copy up to the to-be-masqueraded port */ + memcpy(newbody, oldbody, data_m-oldbody); + ptr=newbody+(data_m-oldbody); + /* substitute port number */ + sprintf(ptr, "%i", outb_rtp_port); + ptr += strlen(ptr); + /* copy up to the c= line */ + memcpy (ptr, data2_m, data_c-data2_m); + ptr += strlen(ptr); + /* insert proxy outbound address */ + sprintf(ptr, "%s", inet_ntoa(outb_addr)); + ptr += strlen(ptr); + /* copy the rest */ + memcpy (ptr, data2_c, strlen(data2_c)); + } + + + - /* insert proxy outbound address */ - sts = get_ip_by_host(configuration.outboundhost, &addr); - ptr=newbody+(data-oldbody); - sprintf(ptr, "%s", inet_ntoa(addr)); - ptr += strlen(ptr); - - /* copy rest */ - memcpy (ptr, data2, strlen(data2)); } /* remove old body */ sts = list_remove(mymsg->bodies, 0); body_free(body); free(body); + /* free sdp structure */ + sdp_free(sdp); + free(sdp); /* include new body */ msg_setbody(mymsg, newbody); @@ -526,7 +646,7 @@ int proxy_rewrite_invitation_body(sip_t *mymsg){ sts = msg_setcontent_length(mymsg, clen); -{ +{ /* just dump the buffer */ char *tmp, *tmp2; sts = msg_getbody(mymsg, 0, &body); sts = body_2char(body, &tmp); diff --git a/src/readconf.c b/src/readconf.c index da25f9d..259a225 100644 --- a/src/readconf.c +++ b/src/readconf.c @@ -19,6 +19,7 @@ */ #include "config.h" + #include #include #include @@ -111,11 +112,15 @@ static int parse_config (FILE *configfile) { enum type {TYP_INT4, TYP_STRING, TYP_FLOAT} type; void *dest; } configoptions[] = { - { "debug_level", TYP_INT4, &configuration.debuglevel }, - { "sip_port", TYP_INT4, &configuration.sip_listen_port }, - { "daemonize", TYP_INT4, &configuration.daemonize }, - { "host_inbound", TYP_STRING, &configuration.inboundhost }, - { "host_outbound", TYP_STRING, &configuration.outboundhost }, + { "debug_level", TYP_INT4, &configuration.debuglevel }, + { "sip_listen_port", TYP_INT4, &configuration.sip_listen_port }, + { "daemonize", TYP_INT4, &configuration.daemonize }, + { "host_inbound", TYP_STRING, &configuration.inboundhost }, + { "host_outbound", TYP_STRING, &configuration.outboundhost }, + { "rtp_port_low", TYP_INT4, &configuration.rtp_port_low }, + { "rtp_port_high", TYP_INT4, &configuration.rtp_port_high }, + { "rtp_timeout", TYP_INT4, &configuration.rtp_timeout }, + { "rtp_proxy_enable", TYP_INT4, &configuration.rtp_proxy_enable }, {0, 0, 0} }; diff --git a/src/register.c b/src/register.c index d398462..262e2cd 100644 --- a/src/register.c +++ b/src/register.c @@ -39,7 +39,8 @@ static char const ident[]="$Id: " __FILE__ ": " PACKAGE "-" VERSION "-"\ extern struct siproxd_config configuration; extern int errno; -struct urlmap_s urlmap[URLMAP_SIZE]; // URL mapping table +struct urlmap_s urlmap[URLMAP_SIZE]; /* URL mapping table */ +extern int sip_socket; /* sending SIP datagrams */ /* * initialize the URL mapping table @@ -237,7 +238,7 @@ int register_response(sip_t *request, int flag) { port=configuration.sip_listen_port; } - sipsock_send_udp(addr, port, buffer, strlen(buffer)); + sipsock_send_udp(&sip_socket, addr, port, buffer, strlen(buffer), 1); /* free the resources */ msg_free(response); diff --git a/src/siproxd.c b/src/siproxd.c index df14b36..c09d257 100644 --- a/src/siproxd.c +++ b/src/siproxd.c @@ -40,6 +40,9 @@ static char const ident[]="$Id: " __FILE__ ": " PACKAGE "-" VERSION "-"\ /* configuration storage */ struct siproxd_config configuration; +/* socket used for sending SIP datagrams */ +int sip_socket=0; + int main (int argc, char *argv[]) { int sts; @@ -120,6 +123,9 @@ int main (int argc, char *argv[]) /* listen for incomming messages */ sipsock_listen(); + /* initialize the RTP proxy thread */ + rtpproxy_init(); + /* daemonize if requested to */ if (configuration.daemonize) { DEBUGC(DBCLASS_CONFIG,"daemonizing"); diff --git a/src/siproxd.h b/src/siproxd.h index aad48d4..505d7a3 100644 --- a/src/siproxd.h +++ b/src/siproxd.h @@ -24,7 +24,9 @@ int sipsock_listen (void); int sipsock_wait(void); int sipsock_read(void *buf, size_t bufsize); -int sipsock_send_udp(struct in_addr addr, int port, char *buffer, int size); +int sipsock_send_udp(int *sock, struct in_addr addr, int port, + char *buffer, int size, int allowdump); +int sockbind(struct in_addr ipaddr, int localport); /* register.c */ void register_init(void); @@ -50,6 +52,13 @@ int compare_url(url_t *url1, url_t *url2); /* config.c */ int read_config(char *name, int search); +/* rtpproxy.c */ +int rtpproxy_init( void ); +int rtp_start_fwd (call_id_t *callid, + struct in_addr outbound_ipaddr, int *outboundport, + struct in_addr lcl_client_ipaddr, int lcl_clientport); +int rtp_stop_fwd (call_id_t *callid); + /* * table to hold the client registrations @@ -72,6 +81,10 @@ struct siproxd_config { char *outboundhost; int sip_listen_port; int daemonize; + int rtp_port_low; + int rtp_port_high; + int rtp_timeout; + int rtp_proxy_enable; }; @@ -80,8 +93,11 @@ struct siproxd_config { */ #define SIP_PORT 5060 -#define URLMAP_SIZE 128 // size of URL mapping table +#define URLMAP_SIZE 8 // number of URL mapping table entries +#define RTPPROXY_SIZE 8 // number of rtp proxy entries + #define BUFFER_SIZE 1024 // input buffer for read from socket +#define RTP_BUFFER_SIZE 512 // max size of an RTP frame #define URL_STRING_SIZE 128 // max size of an URL/URI string #define STATUSCODE_SIZE 5 // size of string representation of status #define DNS_CACHE_SIZE 32 // number of entries in internal DNS cache diff --git a/src/sock.c b/src/sock.c index 682401e..35dc4ef 100644 --- a/src/sock.c +++ b/src/sock.c @@ -53,24 +53,10 @@ static int listen_socket=0; * returns 0 on success */ int sipsock_listen (void) { - struct sockaddr_in my_addr; - int sts; + struct in_addr ipaddr; - my_addr.sin_family = AF_INET; - memset(&my_addr.sin_addr.s_addr, 0, sizeof(struct in_addr)); - my_addr.sin_port= htons(configuration.sip_listen_port); - - listen_socket=socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); - if (listen_socket == 0) { - ERROR("socket() call failed:%s",strerror(errno)); - return 1; - } - - sts=bind(listen_socket, (struct sockaddr *)&my_addr, sizeof(my_addr)); - if (sts != 0) { - ERROR("bind failed:%s",strerror(errno)); - return 2; - } + memset(&ipaddr, 0, sizeof(struct in_addr)); + listen_socket=sockbind(ipaddr, configuration.sip_listen_port); DEBUGC(DBCLASS_NET,"bound listen socket %i",listen_socket); return 0; @@ -106,29 +92,33 @@ int sipsock_read(void *buf, size_t bufsize) { /* * sends an UDP datagram to the specified destination */ -int sipsock_send_udp(struct in_addr addr, int port, char *buffer, int size) { +int sipsock_send_udp(int *sock, struct in_addr addr, int port, + char *buffer, int size, int allowdump) { struct sockaddr_in dst_addr; - static int s=0; int sts; /* first time: allocate a socket for sending */ - if (s == 0) { - s=socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); - if (s == 0) { + if (*sock == 0) { + *sock=socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); + if (*sock == 0) { ERROR("socket() call failed:%s",strerror(errno)); return 1; } - DEBUGC(DBCLASS_NET,"allocated send socket %i",s); + DEBUGC(DBCLASS_NET,"allocated send socket %i",*sock); } dst_addr.sin_family = AF_INET; memcpy(&dst_addr.sin_addr.s_addr, &addr, sizeof(struct in_addr)); dst_addr.sin_port= htons(port); - DEBUGC(DBCLASS_NET,"send UDP packet to %s",inet_ntoa(addr)); - DUMP_BUFFER(DBCLASS_NETTRAF, buffer, size); - sts = sendto (s, buffer, size, 0, &dst_addr, sizeof(dst_addr)); + if (allowdump) { + DEBUGC(DBCLASS_NET,"send UDP packet to %s:%i", + inet_ntoa(addr),port); + DUMP_BUFFER(DBCLASS_NETTRAF, buffer, size); + } + + sts = sendto (*sock, buffer, size, 0, &dst_addr, sizeof(dst_addr)); if (sts == -1) { ERROR("sendto() call failed:%s",strerror(errno)); @@ -138,3 +128,35 @@ int sipsock_send_udp(struct in_addr addr, int port, char *buffer, int size) { return 0; } + + +/* + * generic routine to allocate and bind a socket to a specified + * local address and port (UDP) + * + * returns socket number on success, zero on failure + */ +int sockbind(struct in_addr ipaddr, int localport) { + struct sockaddr_in my_addr; + int sts; + int sock; + + my_addr.sin_family = AF_INET; + memcpy(&my_addr.sin_addr.s_addr, &ipaddr, sizeof(struct in_addr)); + my_addr.sin_port= htons(localport); + + sock=socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); + if (sock == 0) { + ERROR("socket() call failed:%s",strerror(errno)); + return 0; + } + + sts=bind(sock, (struct sockaddr *)&my_addr, sizeof(my_addr)); + if (sts != 0) { + ERROR("bind failed:%s",strerror(errno)); + close(sock); + return 0; + } + + return sock; +} diff --git a/src/utils.c b/src/utils.c index 6665171..c871102 100644 --- a/src/utils.c +++ b/src/utils.c @@ -113,6 +113,7 @@ int is_via_local (via_t *via) { struct in_addr addr_via, addr_myself; char *my_hostnames[]= { configuration.inboundhost, configuration.outboundhost, NULL }; + int port; int i; char *ptr; @@ -131,7 +132,11 @@ int is_via_local (via_t *via) { /* check the extracted VIA against my own host addresses */ sts = get_ip_by_host(ptr, &addr_myself); - if (memcmp(&addr_myself, &addr_via, sizeof(addr_myself))==0) { + if (via->port) port=atoi(via->port); + else port=SIP_PORT; + + if ( (memcmp(&addr_myself, &addr_via, sizeof(addr_myself))==0) && + (port == configuration.sip_listen_port) ) { sts=1; break; } @@ -156,6 +161,8 @@ int get_ip_by_host(char *hostname, struct in_addr *addr) { } dns_cache[DNS_CACHE_SIZE]; static int cache_initialized=0; + if (hostname == NULL) return 1; + /* first time: initialize DNS cache */ if (cache_initialized == 0) { DEBUGC(DBCLASS_DNS, "initializing DNS cache (%i entries)", DNS_CACHE_SIZE); @@ -166,6 +173,7 @@ int get_ip_by_host(char *hostname, struct in_addr *addr) { time(&t); /* clean expired entries */ for (i=0; i