592 lines
17 KiB
C
592 lines
17 KiB
C
/* IPX driver for native Linux TCP/IP networking (UDP implementation)
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* Version 0.99.2
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* Contact Jan [Lace] Kratochvil <short@ucw.cz> for assistance
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* (no "It somehow doesn't work! What should I do?" complaints, please)
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* Special thanks to Vojtech Pavlik <vojtech@ucw.cz> for testing.
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*
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* Also you may see KIX - KIX kix out KaliNix (in Linux-Linux only):
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* http://atrey.karlin.mff.cuni.cz/~short/sw/kix.c.gz
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*
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* Primarily based on ipx_kali.c - "IPX driver for KaliNix interface"
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* which is probably mostly by Jay Cotton <jay@kali.net>.
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* Parts shamelessly stolen from my KIX v0.99.2 and GGN v0.100
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*
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* Changes:
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* --------
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* 0.99.1 - now the default broadcast list also contains all point-to-point
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* links with their destination peer addresses
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* 0.99.2 - commented a bit :-)
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* - now adds to broadcast list each host it gets some packet from
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* which is already not covered by local physical ethernet broadcast
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* - implemented short-signature packet format
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* - compatibility mode for old D1X releases due to the previous bullet
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*
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* Configuration:
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* --------------
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* No network server software is needed, neither KIX nor KaliNIX.
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*
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* Add command line argument "-udp". In default operation D1X will send
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* broadcasts too all the local interfaces found. But you may also use
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* additional parameter specified after "-udp" to modify the default
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* broadcasting style and UDP port numbers binding:
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*
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* ./d1x -udp [@SHIFT]=HOST_LIST Broadcast ONLY to HOST_LIST
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* ./d1x -udp [@SHIFT]+HOST_LIST Broadcast both to local ifaces & to HOST_LIST
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*
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* HOST_LIST is a comma (',') separated list of HOSTs:
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* HOST is an IPv4 address (so-called quad like 192.168.1.2) or regular hostname
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* HOST can also be in form 'address:SHIFT'
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* SHIFT sets the UDP port base offset (e.g. +2), can be used to run multiple
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* clients on one host simultaneously. This SHIFT has nothing to do
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* with the dynamic-sockets (PgUP/PgDOWN) option in Descent, it's another
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* higher-level differentiation option.
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*
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* Examples:
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* ---------
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* ./d1x -udp
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* - Run D1X to participate in normal local network (Linux only, of course)
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*
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* ./d1x -udp @1=localhost:2 & ./d1x -udp @2=localhost:1
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* - Run two clients simultaneously fighting each other (only each other)
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*
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* ./d1x -udp =192.168.4.255
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* - Run distant Descent which will participate with remote network
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* 192.168.4.0 with netmask 255.255.255.0 (broadcast has 192.168.4.255)
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* - You'll have to also setup hosts in that network accordingly:
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* ./d1x -udp +UPPER_DISTANT_MACHINE_NAME
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*
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* Have fun!
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*/
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#include <conf.h>
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#ifdef NETWORK
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#include <stdio.h>
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#include <string.h>
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#include <netinet/in.h> /* for htons & co. */
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#include <unistd.h>
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#include <stdarg.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include <net/if.h>
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#include <sys/ioctl.h>
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#include <ctype.h>
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#include "ipx_drv.h"
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#include "args.h"
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extern unsigned char ipx_MyAddress[10];
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// #define UDPDEBUG
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#define UDP_BASEPORT 28342
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#define PORTSHIFT_TOLERANCE 0x100
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#define MAX_PACKETSIZE 8192
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/* Packet format: first is the signature { 0xD1,'X' } which can be also
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* { 'D','1','X','u','d','p'} for old-fashioned packets.
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* Then follows virtual socket number (as changed during PgDOWN/PgUP)
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* in network-byte-order as 2 bytes (u_short). After such 4/8 byte header
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* follows raw data as communicated with D1X network core functions.
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*/
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// Length HAS TO BE 6!
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#define D1Xudp "D1Xudp"
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// Length HAS TO BE 2!
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#define D1Xid "\xD1X"
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static int open_sockets = 0;
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static int dynamic_socket = 0x401;
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static const int val_one=1;
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/* OUR port. Can be changed by "@X[+=]..." argument (X is the shift value)
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*/
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static int baseport=UDP_BASEPORT;
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/* Have we some old D1X in network and have we to maintain compatibility?
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* FIXME: Following scenario is braindead:
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* A (NEW) , B (OLD) , C (NEW)
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* host A) We start new D1X. A-newcomm, B-none , C-none
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* host B) We start OLD D1X. A-newcomm, B-oldcomm, C-none
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* Now host A hears host B and switches: A-oldcomm, B-oldcomm, C-none
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* host C) We start new D1X. A-oldcomm, B-oldcomm, C-newcomm
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* Now host C hears host A/B and switches: A-oldcomm, B-oldcomm, C-oldcomm
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* Now host B finishes: A-oldcomm, B-none , C-oldcomm
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*
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* But right now we have hosts A and C, both new code equipped but
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* communicating wastefully by the OLD protocol! Bummer.
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*/
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static char compatibility=0;
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static int have_empty_address() {
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int i;
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for (i = 0; i < 10 && !ipx_MyAddress[i]; i++) ;
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return i == 10;
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}
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#define MSGHDR "IPX_udp: "
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static void msg(const char *fmt,...)
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{
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va_list ap;
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fputs(MSGHDR,stdout);
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va_start(ap,fmt);
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vprintf(fmt,ap);
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va_end(ap);
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putchar('\n');
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}
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static void chk(void *p)
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{
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if (p) return;
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msg("FATAL: Virtual memory exhausted!");
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exit(EXIT_FAILURE);
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}
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#define FAIL(m...) do { msg(#m); return -1; } while (0)
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/* Find as much as MAX_BRDINTERFACES during local iface autoconfiguration.
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* Note that more interfaces can be added during manual configuration
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* or host-received-packet autoconfiguration
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*/
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#define MAX_BRDINTERFACES 16
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/* We require the interface to be UP and RUNNING to accept it.
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*/
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#define IF_REQFLAGS (IFF_UP|IFF_RUNNING)
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/* We reject any interfaces declared as LOOPBACK type.
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*/
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#define IF_NOTFLAGS (IFF_LOOPBACK)
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static struct sockaddr_in *broads,broadmasks[MAX_BRDINTERFACES];
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static int broadnum,masksnum,broadsize;
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/* We'll check whether the "broads" array of destination addresses is now
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* full and so needs expanding.
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*/
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static void chkbroadsize(void)
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{
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if (broadnum<broadsize) return;
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broadsize=broadsize?broadsize*2:8;
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chk(broads=realloc(broads,sizeof(*broads)*broadsize));
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}
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/* This function is called during init and has to grab all system interfaces
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* and collect their broadcast-destination addresses (and their netmasks).
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* Typically it founds only one ethernet card and so returns address in
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* the style "192.168.1.255" with netmask "255.255.255.0".
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* Broadcast addresses are filled into "broads", netmasks to "broadmasks".
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*/
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/* Stolen from my GGN */
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static int addiflist(void)
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{
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unsigned cnt=MAX_BRDINTERFACES,i,j;
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struct ifconf ifconf;
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int sock;
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struct sockaddr_in *sinp,*sinmp;
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free(broads);
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if ((sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP))<0)
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FAIL("Creating socket() failure during broadcast detection: %m");
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#ifdef SIOCGIFCOUNT
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if (ioctl(sock,SIOCGIFCOUNT,&cnt))
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{ /* msg("Getting iterface count error: %m"); */ }
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else
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cnt=cnt*2+2;
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#endif
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chk(ifconf.ifc_req=alloca((ifconf.ifc_len=cnt*sizeof(struct ifreq))));
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if (ioctl(sock,SIOCGIFCONF,&ifconf)||ifconf.ifc_len%sizeof(struct ifreq)) {
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close(sock);
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FAIL("ioctl(SIOCGIFCONF) failure during broadcast detection: %m");
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}
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cnt=ifconf.ifc_len/sizeof(struct ifreq);
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chk(broads=malloc(cnt*sizeof(*broads)));
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broadsize=cnt;
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for (i=j=0;i<cnt;i++) {
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if (ioctl(sock,SIOCGIFFLAGS,ifconf.ifc_req+i)) {
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close(sock);
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FAIL("ioctl(udp,\"%s\",SIOCGIFFLAGS) error: %m",ifconf.ifc_req[i].ifr_name);
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}
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if (((ifconf.ifc_req[i].ifr_flags&IF_REQFLAGS)!=IF_REQFLAGS)||
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(ifconf.ifc_req[i].ifr_flags&IF_NOTFLAGS))
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continue;
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if (ioctl(sock,(ifconf.ifc_req[i].ifr_flags&IFF_BROADCAST?SIOCGIFBRDADDR:SIOCGIFDSTADDR),ifconf.ifc_req+i)) {
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close(sock);
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FAIL("ioctl(udp,\"%s\",SIOCGIF{DST/BRD}ADDR) error: %m",ifconf.ifc_req[i].ifr_name);
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}
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sinp =(struct sockaddr_in *)&ifconf.ifc_req[i].ifr_broadaddr;
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sinmp=(struct sockaddr_in *)&ifconf.ifc_req[i].ifr_netmask ;
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if (sinp->sin_family!=AF_INET || sinmp->sin_family!=AF_INET) continue;
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broads[j]=*sinp;
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broads[j].sin_port=UDP_BASEPORT; //FIXME: No possibility to override from cmdline
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broadmasks[j]=*sinmp;
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j++;
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}
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broadnum=j;
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masksnum=j;
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return(0);
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}
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#define addreq(a,b) ((a).sin_port==(b).sin_port&&(a).sin_addr.s_addr==(b).sin_addr.s_addr)
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/* Previous function addiflist() can (and probably will) report multiple
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* same addresses. On some Linux boxes is present both device "eth0" and
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* "dummy0" with the same IP addreesses - we'll filter it here.
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*/
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static void unifyiflist(void)
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{
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int d=0,s,i;
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for (s=0;s<broadnum;s++) {
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for (i=0;i<s;i++)
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if (addreq(broads[s],broads[i])) break;
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if (i>=s) broads[d++]=broads[s];
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}
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broadnum=d;
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}
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static unsigned char qhbuf[6];
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/* Parse PORTSHIFT numeric parameter
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*/
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static void portshift(const char *cs)
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{
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long port;
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unsigned short ports=0;
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port=atol(cs);
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if (port<-PORTSHIFT_TOLERANCE || port>+PORTSHIFT_TOLERANCE)
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msg("Invalid portshift in \"%s\", tolerance is +/-%d",cs,PORTSHIFT_TOLERANCE);
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else ports=htons(port);
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memcpy(qhbuf+4,&ports,2);
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}
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/* Do hostname resolve on name "buf" and return the address in buffer "qhbuf".
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*/
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static unsigned char *queryhost(char *buf)
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{
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struct hostent *he;
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char *s;
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char c=0;
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if ((s=strrchr(buf,':'))) {
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c=*s;
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*s='\0';
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portshift(s+1);
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}
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else memset(qhbuf+4,0,2);
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he=gethostbyname((char *)buf);
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if (s) *s=c;
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if (!he) {
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msg("Error resolving my hostname \"%s\"",buf);
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return(NULL);
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}
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if (he->h_addrtype!=AF_INET || he->h_length!=4) {
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msg("Error parsing resolved my hostname \"%s\"",buf);
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return(NULL);
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}
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if (!*he->h_addr_list) {
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msg("My resolved hostname \"%s\" address list empty",buf);
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return(NULL);
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}
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memcpy(qhbuf,(*he->h_addr_list),4);
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return(qhbuf);
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}
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/* Dump raw form of IP address/port by fancy output to user
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*/
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static void dumpraddr(unsigned char *a)
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{
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short port;
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printf("[%u.%u.%u.%u]",a[0],a[1],a[2],a[3]);
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port=(signed short)ntohs(*(unsigned short *)(a+4));
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if (port) printf(":%+d",port);
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}
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/* Like dumpraddr() but for structure "sockaddr_in"
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*/
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static void dumpaddr(struct sockaddr_in *sin)
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{
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unsigned short ports;
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memcpy(qhbuf+0,&sin->sin_addr,4);
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ports=htons(((short)ntohs(sin->sin_port))-UDP_BASEPORT);
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memcpy(qhbuf+4,&ports,2);
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dumpraddr(qhbuf);
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}
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/* Startup... Uninteresting parsing...
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*/
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static int ipx_udp_GetMyAddress(void) {
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char buf[256];
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int i;
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char *s,*s2,*ns;
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if (!have_empty_address())
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return 0;
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if (!((i=args_find("-udp")) && (s=Args[i+1]) && (*s=='=' || *s=='+' || *s=='@'))) s=NULL;
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if (gethostname(buf,sizeof(buf))) FAIL("Error getting my hostname");
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if (!(queryhost(buf))) FAIL("Querying my own hostname \"%s\"",buf);
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if (s) while (*s=='@') {
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portshift(++s);
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while (isdigit(*s)) s++;
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}
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memset(ipx_MyAddress+0,0,4);
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memcpy(ipx_MyAddress+4,qhbuf,6);
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baseport+=(short)ntohs(*(unsigned short *)(qhbuf+4));
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if (!s || (s && !*s)) addiflist();
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else {
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if (*s=='+') addiflist();
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s++;
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for (;;) {
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struct sockaddr_in *sin;
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while (isspace(*s)) s++;
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if (!*s) break;
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for (s2=s;*s2 && *s2!=',';s2++);
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chk(ns=malloc(s2-s+1));
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memcpy(ns,s,s2-s);
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ns[s2-s]='\0';
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if (!queryhost(ns)) msg("Ignored broadcast-destination \"%s\" as being invalid",ns);
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free(ns);
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chkbroadsize();
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sin=broads+(broadnum++);
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sin->sin_family=AF_INET;
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memcpy(&sin->sin_addr,qhbuf+0,4);
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sin->sin_port=htons(((short)ntohs(*(unsigned short *)(qhbuf+4)))+UDP_BASEPORT);
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s=s2+(*s2==',');
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}
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}
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unifyiflist();
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printf(MSGHDR "Using TCP/IP address ");
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dumpraddr(ipx_MyAddress+4);
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putchar('\n');
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if (broadnum) {
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printf(MSGHDR "Using %u broadcast-dest%s:",broadnum,(broadnum==1?"":"s"));
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for (i=0;i<broadnum;i++) {
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putchar(' ');
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dumpaddr(broads+i);
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}
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putchar('\n');
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}
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return 0;
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}
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/* We should probably avoid such insanity here as during PgUP/PgDOWN
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* (virtual port number change) we wastefully destroy/create the same
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* socket here (binded always to "baseport"). FIXME.
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* "open_sockets" can be only 0 or 1 anyway.
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*/
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static int ipx_udp_OpenSocket(ipx_socket_t *sk, int port) {
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struct sockaddr_in sin;
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if (!open_sockets)
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if (have_empty_address())
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if (ipx_udp_GetMyAddress() < 0) FAIL("Error getting my address");
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msg("OpenSocket on D1X socket port %d",port);
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if (!port)
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port = dynamic_socket++;
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if ((sk->fd = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP)) < 0) {
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sk->fd = -1;
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FAIL("socket() creation failed on port %d: %m",port);
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}
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if (setsockopt(sk->fd,SOL_SOCKET,SO_BROADCAST,&val_one,sizeof(val_one))) {
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if (close(sk->fd)) msg("close() failed during error recovery: %m");
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sk->fd=-1;
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FAIL("setsockopt(SO_BROADCAST) failed: %m");
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}
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sin.sin_family=AF_INET;
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sin.sin_addr.s_addr=htonl(INADDR_ANY);
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sin.sin_port=htons(baseport);
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if (bind(sk->fd,(struct sockaddr *)&sin,sizeof(sin))) {
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if (close(sk->fd)) msg("close() failed during error recovery: %m");
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sk->fd=-1;
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FAIL("bind() to UDP port %d failed: %m",baseport);
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}
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open_sockets++;
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sk->socket = port;
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return 0;
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}
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/* The same comment as in previous "ipx_udp_OpenSocket"...
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*/
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static void ipx_udp_CloseSocket(ipx_socket_t *mysock) {
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if (!open_sockets) {
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msg("close w/o open");
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return;
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}
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msg("CloseSocket on D1X socket port %d",mysock->socket);
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if (close(mysock->fd))
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msg("close() failed on CloseSocket D1X socket port %d: %m",mysock->socket);
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mysock->fd=-1;
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if (--open_sockets) {
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msg("(closesocket) %d sockets left", open_sockets);
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return;
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}
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}
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/* Here we'll send the packet to our host. If it is unicast packet, send
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* it to IP address/port as retrieved from IPX address. Otherwise (broadcast)
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* we'll repeat the same data to each host in our broadcasting list.
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*/
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static int ipx_udp_SendPacket(ipx_socket_t *mysock, IPXPacket_t *IPXHeader,
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u_char *data, int dataLen) {
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struct sockaddr_in toaddr,*dest;
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int i=dataLen;
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int bcast;
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char *buf;
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#ifdef UDPDEBUG
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msg("SendPacket enter, dataLen=%d",dataLen);
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#endif
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if (dataLen<0 || dataLen>MAX_PACKETSIZE) return -1;
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chk(buf=alloca(8+dataLen));
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if (compatibility) memcpy(buf+0,D1Xudp,6),buf+=6;
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else memcpy(buf+0,D1Xid ,2),buf+=2;
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memcpy(buf+0,IPXHeader->Destination.Socket,2);
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memcpy(buf+2,data,dataLen);
|
|
|
|
toaddr.sin_family=AF_INET;
|
|
memcpy(&toaddr.sin_addr,IPXHeader->Destination.Node+0,4);
|
|
toaddr.sin_port=htons(((short)ntohs(*(unsigned short *)(IPXHeader->Destination.Node+4)))+UDP_BASEPORT);
|
|
|
|
for (bcast=(toaddr.sin_addr.s_addr==htonl(INADDR_BROADCAST)?0:-1);bcast<broadnum;bcast++) {
|
|
if (bcast>=0) dest=broads+bcast;
|
|
else dest=&toaddr;
|
|
|
|
#ifdef UDPDEBUG
|
|
printf(MSGHDR "sendto((%d),Node=[4] %02X %02X,Socket=%02X %02X,s_port=%u,",
|
|
dataLen,
|
|
IPXHeader->Destination.Node [4],IPXHeader->Destination.Node [5],
|
|
IPXHeader->Destination.Socket[0],IPXHeader->Destination.Socket[1],
|
|
ntohs(dest->sin_port));
|
|
dumpaddr(dest);
|
|
puts(").");
|
|
#endif
|
|
i=sendto(mysock->fd,buf-(compatibility?6:2),(compatibility?8:4)+dataLen,
|
|
0,(struct sockaddr *)dest,sizeof(*dest));
|
|
if (bcast==-1) return (i<8?-1:i-8);
|
|
}
|
|
return(dataLen);
|
|
}
|
|
|
|
/* Here we will receive new packet to the given buffer. Both formats of packets
|
|
* are supported, we fallback to old format when first obsolete packet is seen.
|
|
* If the (valid) packet is received from unknown host, we will add it to our
|
|
* broadcasting list. FIXME: For now such autoconfigured hosts are NEVER removed.
|
|
*/
|
|
|
|
static int ipx_udp_ReceivePacket(ipx_socket_t *s, char *outbuf, int outbufsize,
|
|
struct ipx_recv_data *rd) {
|
|
int size;
|
|
struct sockaddr_in fromaddr;
|
|
int fromaddrsize=sizeof(fromaddr);
|
|
unsigned short ports;
|
|
size_t offs;
|
|
int i;
|
|
|
|
if ((size=recvfrom(s->fd,outbuf,outbufsize,0,(struct sockaddr *)&fromaddr,&fromaddrsize))<0)
|
|
return -1;
|
|
#ifdef UDPDEBUG
|
|
printf(MSGHDR "recvfrom((%d-8=%d),",size,size-8);
|
|
dumpaddr(&fromaddr);
|
|
puts(").");
|
|
#endif
|
|
if (fromaddr.sin_family!=AF_INET) return -1;
|
|
if (size<4) return -1;
|
|
if (memcmp(outbuf+0,D1Xid,2)) {
|
|
if (size<8 || memcmp(outbuf+0,D1Xudp,6)) return -1;
|
|
if (!compatibility) {
|
|
compatibility=1;
|
|
fputs(MSGHDR "Received obsolete packet from ",stdout);
|
|
dumpaddr(&fromaddr);
|
|
puts(", upgrade that machine.\n" MSGHDR "Turning on compatibility mode...");
|
|
}
|
|
offs=6;
|
|
}
|
|
else offs=2;
|
|
|
|
/* Lace: (dst_socket & src_socket) should be network-byte-order by comment in include/ipx_drv.h */
|
|
/* This behaviour presented here is broken. It is not used anywhere, so why bother? */
|
|
rd->src_socket = ntohs(*(unsigned short *)(outbuf+offs));
|
|
if (rd->src_socket != s->socket) {
|
|
#ifdef UDPDEBUG
|
|
msg(" - pkt was dropped (dst=%d,my=%d)",rd->src_socket,s->socket);
|
|
#endif
|
|
return -1;
|
|
}
|
|
rd->dst_socket = s->socket;
|
|
|
|
for (i=0;i<broadnum;i++) {
|
|
if (i>=masksnum) {
|
|
if (addreq(fromaddr,broads[i])) break;
|
|
}
|
|
else {
|
|
if (fromaddr.sin_port==broads[i].sin_port
|
|
&&( fromaddr.sin_addr.s_addr & broadmasks[i].sin_addr.s_addr)
|
|
==(broads[i].sin_addr.s_addr & broadmasks[i].sin_addr.s_addr)) break;
|
|
}
|
|
}
|
|
if (i>=broadnum) {
|
|
chkbroadsize();
|
|
broads[broadnum++]=fromaddr;
|
|
fputs(MSGHDR "Adding host ",stdout);
|
|
dumpaddr(&fromaddr);
|
|
puts(" to broadcasting address list");
|
|
}
|
|
|
|
memmove(outbuf,outbuf+offs+2,size-(offs+2));
|
|
size-=offs+2;
|
|
|
|
memcpy(rd->src_node+0,&fromaddr.sin_addr,4);
|
|
ports=htons(ntohs(fromaddr.sin_port)-UDP_BASEPORT);
|
|
memcpy(rd->src_node+4,&ports,2);
|
|
memset(rd->src_network, 0, 4);
|
|
rd->pkt_type = 0;
|
|
#ifdef UDPDEBUG
|
|
printf(MSGHDR "ReceivePacket: size=%d,from=",size);
|
|
dumpraddr(rd->src_node);
|
|
putchar('\n');
|
|
#endif
|
|
|
|
return size;
|
|
}
|
|
|
|
struct ipx_driver ipx_udp = {
|
|
ipx_udp_GetMyAddress,
|
|
ipx_udp_OpenSocket,
|
|
ipx_udp_CloseSocket,
|
|
ipx_udp_SendPacket,
|
|
ipx_udp_ReceivePacket,
|
|
ipx_general_PacketReady
|
|
};
|
|
#endif // NETWORK
|