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- #include <u.h>
- #include <libc.h>
- #include <ip.h>
- #include <bio.h>
- #include <ndb.h>
- #include "dat.h"
- /*
- * ala rfc2131
- */
- enum {
- Maxloglen = 1024,
- };
- typedef struct Req Req;
- struct Req
- {
- int fd; /* for reply */
- Bootp *bp;
- Udphdr *up;
- uchar *e; /* end of received message */
- uchar *p; /* options pointer */
- uchar *max; /* max end of reply */
- /* expanded to v6 */
- uchar ciaddr[IPaddrlen];
- uchar giaddr[IPaddrlen];
- /* parsed options */
- int p9request; /* flag: this is a bootp with plan9 options */
- int genrequest; /* flag: this is a bootp with generic options */
- int broadcast; /* flag: request was broadcast */
- int dhcptype; /* dhcp message type */
- int leasetime; /* dhcp lease */
- uchar ip[IPaddrlen]; /* requested address */
- uchar server[IPaddrlen]; /* server address */
- char msg[ERRMAX]; /* error message */
- char vci[32]; /* vendor class id */
- char *id; /* client id */
- uchar requested[32]; /* requested params */
- uchar vendorclass[32];
- char cputype[32-3];
- Info gii; /* about target network */
- Info ii; /* about target system */
- int staticbinding;
- uchar buf[2*1024]; /* message buffer */
- };
- #define TFTP "/lib/tftpd"
- char *blog = "ipboot";
- char mysysname[64];
- Ipifc *ipifcs;
- int debug;
- int nobootp;
- long now;
- int slowstat, slowdyn;
- char net[256];
- int pptponly; /* only answer request that came from the pptp server */
- int mute, mutestat;
- int minlease = MinLease;
- int staticlease = StaticLease;
- uvlong start;
- static int v6opts;
- /* option magic */
- char plan9opt[4] = { 'p', '9', ' ', ' ' };
- char genericopt[4] = { 0x63, 0x82, 0x53, 0x63 };
- /* well known addresses */
- uchar zeros[Maxhwlen];
- /* option debug buffer */
- char optbuf[1024];
- char *op;
- char *oe = optbuf + sizeof(optbuf);
- char *optname[256] =
- {
- [OBend] "end",
- [OBpad] "pad",
- [OBmask] "mask",
- [OBtimeoff] "timeoff",
- [OBrouter] "router",
- [OBtimeserver] "time",
- [OBnameserver] "name",
- [OBdnserver] "dns",
- [OBlogserver] "log",
- [OBcookieserver] "cookie",
- [OBlprserver] "lpr",
- [OBimpressserver] "impress",
- [OBrlserver] "rl",
- [OBhostname] "host",
- [OBbflen] "bflen",
- [OBdumpfile] "dumpfile",
- [OBdomainname] "dom",
- [OBswapserver] "swap",
- [OBrootpath] "rootpath",
- [OBextpath] "extpath",
- [OBipforward] "ipforward",
- [OBnonlocal] "nonlocal",
- [OBpolicyfilter] "policyfilter",
- [OBmaxdatagram] "maxdatagram",
- [OBttl] "ttl",
- [OBpathtimeout] "pathtimeout",
- [OBpathplateau] "pathplateau",
- [OBmtu] "mtu",
- [OBsubnetslocal] "subnetslocal",
- [OBbaddr] "baddr",
- [OBdiscovermask] "discovermask",
- [OBsupplymask] "supplymask",
- [OBdiscoverrouter] "discoverrouter",
- [OBrsserver] "rsserver",
- [OBstaticroutes] "staticroutes",
- [OBtrailerencap] "trailerencap",
- [OBarptimeout] "arptimeout",
- [OBetherencap] "etherencap",
- [OBtcpttl] "tcpttl",
- [OBtcpka] "tcpka",
- [OBtcpkag] "tcpkag",
- [OBnisdomain] "nisdomain",
- [OBniserver] "niserver",
- [OBntpserver] "ntpserver",
- [OBvendorinfo] "vendorinfo",
- [OBnetbiosns] "NBns",
- [OBnetbiosdds] "NBdds",
- [OBnetbiostype] "NBtype",
- [OBnetbiosscope] "NBscope",
- [OBxfontserver] "xfont",
- [OBxdispmanager] "xdisp",
- [OBnisplusdomain] "NPdomain",
- [OBnisplusserver] "NP",
- [OBhomeagent] "homeagent",
- [OBsmtpserver] "smtp",
- [OBpop3server] "pop3",
- [OBnntpserver] "nntp",
- [OBwwwserver] "www",
- [OBfingerserver] "finger",
- [OBircserver] "ircserver",
- [OBstserver] "stserver",
- [OBstdaserver] "stdaserver",
- /* dhcp options */
- [ODipaddr] "ip",
- [ODlease] "leas",
- [ODoverload] "overload",
- [ODtype] "typ",
- [ODserverid] "sid",
- [ODparams] "params",
- [ODmessage] "message",
- [ODmaxmsg] "maxmsg",
- [ODrenewaltime] "renewaltime",
- [ODrebindingtime] "rebindingtime",
- [ODvendorclass] "vendorclass",
- [ODclientid] "cid",
- [ODtftpserver] "tftpserver",
- [ODbootfile] "bf",
- };
- void addropt(Req*, int, uchar*);
- void addrsopt(Req*, int, uchar**, int);
- void arpenter(uchar*, uchar*);
- void bootp(Req*);
- void byteopt(Req*, int, uchar);
- void dhcp(Req*);
- void fatal(int, char*, ...);
- void hexopt(Req*, int, char*);
- void logdhcp(Req*);
- void logdhcpout(Req *, char *);
- void longopt(Req*, int, long);
- void maskopt(Req*, int, uchar*);
- void miscoptions(Req*, uchar*);
- int openlisten(char *net);
- void p9addrsopt(Req *rp, int t, uchar **ip, int i);
- void parseoptions(Req*);
- void proto(Req*, int);
- void rcvdecline(Req*);
- void rcvdiscover(Req*);
- void rcvinform(Req*);
- void rcvrelease(Req*);
- void rcvrequest(Req*);
- int readlast(int, uchar*, int);
- char* readsysname(void);
- void remrequested(Req*, int);
- void sendack(Req*, uchar*, int, int);
- void sendnak(Req*, char*);
- void sendoffer(Req*, uchar*, int);
- void stringopt(Req*, int, char*);
- void termopt(Req*);
- int validip(uchar*);
- void vectoropt(Req*, int, uchar*, int);
- void warning(int, char*, ...);
- void
- timestamp(char *tag)
- {
- uvlong t;
- t = nsec()/1000;
- syslog(0, blog, "%s %lludµs", tag, t - start);
- }
- void
- usage(void)
- {
- fprint(2, "usage: dhcp [-dmnprsSZ] [-f directory] [-M minlease] "
- "[-x netmtpt] [-Z staticlease] addr n [addr n] ...\n");
- exits("usage");
- }
- void
- main(int argc, char **argv)
- {
- int i, n, fd;
- uchar ip[IPaddrlen];
- Req r;
- setnetmtpt(net, sizeof net, nil);
- fmtinstall('E', eipfmt);
- fmtinstall('I', eipfmt);
- fmtinstall('V', eipfmt);
- fmtinstall('M', eipfmt);
- ARGBEGIN {
- case '6':
- v6opts = 1;
- break;
- case 'd':
- debug = 1;
- break;
- case 'f':
- ndbfile = EARGF(usage());
- break;
- case 'm':
- mute = 1;
- break;
- case 'M':
- minlease = atoi(EARGF(usage()));
- if(minlease <= 0)
- minlease = MinLease;
- break;
- case 'n':
- nobootp = 1;
- break;
- case 'p':
- pptponly = 1;
- break;
- case 'r':
- mutestat = 1;
- break;
- case 's':
- slowstat = 1;
- break;
- case 'S':
- slowdyn = 1;
- break;
- case 'x':
- setnetmtpt(net, sizeof net, EARGF(usage()));
- break;
- case 'Z':
- staticlease = atoi(EARGF(usage()));
- if(staticlease <= 0)
- staticlease = StaticLease;
- break;
- default:
- usage();
- break;
- } ARGEND;
- while(argc > 1){
- parseip(ip, argv[0]);
- if(!validip(ip))
- usage();
- n = atoi(argv[1]);
- if(n <= 0)
- usage();
- initbinding(ip, n);
- argc -= 2;
- argv += 2;
- }
- /* for debugging */
- for(i = 0; i < 256; i++)
- if(optname[i] == 0)
- optname[i] = smprint("%d", i);
- /* what is my name? */
- strcpy(mysysname, readsysname());
- /* put process in background */
- if(!debug)
- switch(rfork(RFNOTEG|RFPROC|RFFDG)) {
- case -1:
- fatal(1, "fork");
- case 0:
- break;
- default:
- exits(0);
- }
- if (chdir(TFTP) < 0)
- warning(1, "can't change directory to %s", TFTP);
- fd = openlisten(net);
- for(;;){
- memset(&r, 0, sizeof(r));
- r.fd = fd;
- n = readlast(r.fd, r.buf, sizeof(r.buf));
- if(n < Udphdrsize)
- fatal(1, "error reading requests");
- start = nsec()/1000;
- op = optbuf;
- *op = 0;
- proto(&r, n);
- if(r.id != nil)
- free(r.id);
- }
- }
- void
- proto(Req *rp, int n)
- {
- uchar relip[IPaddrlen];
- char buf[64];
- now = time(0);
- rp->e = rp->buf + n;
- rp->bp = (Bootp*)rp->buf;
- rp->up = (Udphdr*)rp->buf;
- if (ipcmp(rp->up->laddr, IPv4bcast) == 0){
- ipmove(rp->up->laddr, rp->up->ifcaddr);
- rp->broadcast = 1;
- }
- rp->max = rp->buf + Udphdrsize + MINSUPPORTED - IPUDPHDRSIZE;
- rp->p = rp->bp->optdata;
- v4tov6(rp->giaddr, rp->bp->giaddr);
- v4tov6(rp->ciaddr, rp->bp->ciaddr);
- if(pptponly && rp->bp->htype != 0)
- return;
- ipifcs = readipifc(net, ipifcs, -1);
- if(validip(rp->giaddr))
- ipmove(relip, rp->giaddr);
- else if(validip(rp->up->raddr))
- ipmove(relip, rp->up->raddr);
- else
- ipmove(relip, rp->up->laddr);
- if(rp->e < (uchar*)rp->bp->sname){
- warning(0, "packet too short");
- return;
- }
- if(rp->bp->op != Bootrequest){
- warning(0, "not bootrequest");
- return;
- }
- if(rp->e >= rp->bp->optdata){
- if(memcmp(rp->bp->optmagic, plan9opt, sizeof(rp->bp->optmagic)) == 0)
- rp->p9request = 1;
- if(memcmp(rp->bp->optmagic, genericopt, sizeof(rp->bp->optmagic)) == 0) {
- rp->genrequest = 1;
- parseoptions(rp);
- }
- }
- rp->p = rp->bp->optdata;
- /* If no id is specified, make one from the hardware address
- * of the target. We assume all zeros is not a hardware address
- * which could be a mistake.
- */
- if(rp->id == nil){
- if(rp->bp->hlen > Maxhwlen){
- warning(0, "hlen %d", rp->bp->hlen);
- return;
- }
- if(memcmp(zeros, rp->bp->chaddr, rp->bp->hlen) == 0){
- warning(0, "no chaddr");
- return;
- }
- sprint(buf, "hwa%2.2ux_", rp->bp->htype);
- rp->id = tohex(buf, rp->bp->chaddr, rp->bp->hlen);
- }
- /* info about gateway */
- if(lookupip(relip, &rp->gii, 1) < 0){
- warning(0, "lookupip failed");
- return;
- }
- /* info about target system */
- if(lookup(rp->bp, &rp->ii, &rp->gii) == 0)
- if(rp->ii.indb && rp->ii.dhcpgroup[0] == 0)
- rp->staticbinding = 1;
- if(rp->dhcptype)
- dhcp(rp);
- else
- bootp(rp);
- timestamp("done");
- }
- /*
- * since we are single-threaded, this causes us to effectively
- * stop listening while we sleep.
- */
- static void
- slowdelay(Req *rp)
- {
- if(slowstat && rp->staticbinding || slowdyn && !rp->staticbinding)
- sleep(1000);
- }
- void
- dhcp(Req *rp)
- {
- logdhcp(rp);
- switch(rp->dhcptype){
- case Discover:
- slowdelay(rp);
- rcvdiscover(rp);
- break;
- case Request:
- rcvrequest(rp);
- break;
- case Decline:
- rcvdecline(rp);
- break;
- case Release:
- rcvrelease(rp);
- break;
- case Inform:
- rcvinform(rp);
- break;
- }
- }
- void
- rcvdiscover(Req *rp)
- {
- Binding *b, *nb;
- if(rp->staticbinding){
- sendoffer(rp, rp->ii.ipaddr, (staticlease > minlease? staticlease: minlease));
- return;
- }
- /*
- * first look for an outstanding offer
- */
- b = idtooffer(rp->id, &rp->gii);
- /*
- * rfc2131 says:
- * If an address is available, the new address
- * SHOULD be chosen as follows:
- *
- * o The client's current address as recorded in the client's current
- * binding, ELSE
- *
- * o The client's previous address as recorded in the client's (now
- * expired or released) binding, if that address is in the server's
- * pool of available addresses and not already allocated, ELSE
- *
- * o The address requested in the 'Requested IP Address' option, if that
- * address is valid and not already allocated, ELSE
- *
- * o A new address allocated from the server's pool of available
- * addresses; the address is selected based on the subnet from which
- * the message was received (if 'giaddr' is 0) or on the address of
- * the relay agent that forwarded the message ('giaddr' when not 0).
- */
- if(b == nil){
- b = idtobinding(rp->id, &rp->gii, 1);
- if(b && b->boundto && strcmp(b->boundto, rp->id) != 0)
- if(validip(rp->ip) && samenet(rp->ip, &rp->gii)){
- nb = iptobinding(rp->ip, 0);
- if(nb && nb->lease < now)
- b = nb;
- }
- }
- if(b == nil){
- warning(0, "!Discover(%s via %I): no binding %I",
- rp->id, rp->gii.ipaddr, rp->ip);
- return;
- }
- mkoffer(b, rp->id, rp->leasetime);
- sendoffer(rp, b->ip, b->offer);
- }
- void
- rcvrequest(Req *rp)
- {
- Binding *b;
- if(validip(rp->server)){
- /* this is a reply to an offer - SELECTING */
- /* check for hard assignment */
- if(rp->staticbinding){
- if(forme(rp->server))
- sendack(rp, rp->ii.ipaddr,
- (staticlease > minlease? staticlease:
- minlease), 1);
- else
- warning(0, "!Request(%s via %I): for server %I not me",
- rp->id, rp->gii.ipaddr, rp->server);
- return;
- }
- b = idtooffer(rp->id, &rp->gii);
- /* if we don't have an offer, nak */
- if(b == nil){
- warning(0, "!Request(%s via %I): no offer",
- rp->id, rp->gii.ipaddr);
- if(forme(rp->server))
- sendnak(rp, "no offer for you");
- return;
- }
- /* if not for me, retract offer */
- if(!forme(rp->server)){
- b->expoffer = 0;
- warning(0, "!Request(%s via %I): for server %I not me",
- rp->id, rp->gii.ipaddr, rp->server);
- return;
- }
- /*
- * if the client is confused about what we offered, nak.
- * client really shouldn't be specifying this when selecting
- */
- if(validip(rp->ip) && ipcmp(rp->ip, b->ip) != 0){
- warning(0, "!Request(%s via %I): requests %I, not %I",
- rp->id, rp->gii.ipaddr, rp->ip, b->ip);
- sendnak(rp, "bad ip address option");
- return;
- }
- if(commitbinding(b) < 0){
- warning(0, "!Request(%s via %I): can't commit %I",
- rp->id, rp->gii.ipaddr, b->ip);
- sendnak(rp, "can't commit binding");
- return;
- }
- sendack(rp, b->ip, b->offer, 1);
- } else if(validip(rp->ip)){
- /*
- * checking address/net - INIT-REBOOT
- *
- * This is a rebooting client that remembers its old
- * address.
- */
- /* check for hard assignment */
- if(rp->staticbinding){
- if(memcmp(rp->ip, rp->ii.ipaddr, IPaddrlen) != 0){
- warning(0, "!Request(%s via %I): %I not valid for %E",
- rp->id, rp->gii.ipaddr, rp->ip, rp->bp->chaddr);
- sendnak(rp, "not valid");
- }
- sendack(rp, rp->ii.ipaddr, (staticlease > minlease?
- staticlease: minlease), 1);
- return;
- }
- /* make sure the network makes sense */
- if(!samenet(rp->ip, &rp->gii)){
- warning(0, "!Request(%s via %I): bad forward of %I",
- rp->id, rp->gii.ipaddr, rp->ip);
- sendnak(rp, "wrong network");
- return;
- }
- b = iptobinding(rp->ip, 0);
- if(b == nil){
- warning(0, "!Request(%s via %I): no binding for %I",
- rp->id, rp->gii.ipaddr, rp->ip);
- return;
- }
- if(memcmp(rp->ip, b->ip, IPaddrlen) != 0 || now > b->lease){
- warning(0, "!Request(%s via %I): %I not valid",
- rp->id, rp->gii.ipaddr, rp->ip);
- sendnak(rp, "not valid");
- return;
- }
- b->offer = b->lease - now;
- sendack(rp, b->ip, b->offer, 1);
- } else if(validip(rp->ciaddr)){
- /*
- * checking address - RENEWING or REBINDING
- *
- * these states are indistinguishable in our action. The only
- * difference is how close to lease expiration the client is.
- * If it is really close, it broadcasts the request hoping that
- * some server will answer.
- */
- /* check for hard assignment */
- if(rp->staticbinding){
- if(ipcmp(rp->ciaddr, rp->ii.ipaddr) != 0){
- warning(0, "!Request(%s via %I): %I not valid",
- rp->id, rp->gii.ipaddr, rp->ciaddr);
- sendnak(rp, "not valid");
- }
- sendack(rp, rp->ii.ipaddr, (staticlease > minlease?
- staticlease: minlease), 1);
- return;
- }
- /* make sure the network makes sense */
- if(!samenet(rp->ciaddr, &rp->gii)){
- warning(0, "!Request(%s via %I): bad forward of %I",
- rp->id, rp->gii.ipaddr, rp->ip);
- sendnak(rp, "wrong network");
- return;
- }
- b = iptobinding(rp->ciaddr, 0);
- if(b == nil){
- warning(0, "!Request(%s via %I): no binding for %I",
- rp->id, rp->gii.ipaddr, rp->ciaddr);
- return;
- }
- if(ipcmp(rp->ciaddr, b->ip) != 0){
- warning(0, "!Request(%I via %s): %I not valid",
- rp->id, rp->gii.ipaddr, rp->ciaddr);
- sendnak(rp, "invalid ip address");
- return;
- }
- mkoffer(b, rp->id, rp->leasetime);
- if(commitbinding(b) < 0){
- warning(0, "!Request(%s via %I): can't commit %I",
- rp->id, rp->gii.ipaddr, b->ip);
- sendnak(rp, "can't commit binding");
- return;
- }
- sendack(rp, b->ip, b->offer, 1);
- }
- }
- void
- rcvdecline(Req *rp)
- {
- Binding *b;
- char buf[64];
- if(rp->staticbinding)
- return;
- b = idtooffer(rp->id, &rp->gii);
- if(b == nil){
- warning(0, "!Decline(%s via %I): no binding",
- rp->id, rp->gii.ipaddr);
- return;
- }
- /* mark ip address as in use */
- snprint(buf, sizeof(buf), "declined by %s", rp->id);
- mkoffer(b, buf, 0x7fffffff);
- commitbinding(b);
- }
- void
- rcvrelease(Req *rp)
- {
- Binding *b;
- if(rp->staticbinding)
- return;
- b = idtobinding(rp->id, &rp->gii, 0);
- if(b == nil){
- warning(0, "!Release(%s via %I): no binding",
- rp->id, rp->gii.ipaddr);
- return;
- }
- if(strcmp(rp->id, b->boundto) != 0){
- warning(0, "!Release(%s via %I): invalid release of %I",
- rp->id, rp->gii.ipaddr, rp->ip);
- return;
- }
- warning(0, "Release(%s via %I): releasing %I", b->boundto, rp->gii.ipaddr, b->ip);
- if(releasebinding(b, rp->id) < 0)
- warning(0, "release: couldn't release");
- }
- void
- rcvinform(Req *rp)
- {
- Binding *b;
- if(rp->staticbinding){
- sendack(rp, rp->ii.ipaddr, 0, 0);
- return;
- }
- b = iptobinding(rp->ciaddr, 0);
- if(b == nil){
- warning(0, "!Inform(%s via %I): no binding for %I",
- rp->id, rp->gii.ipaddr, rp->ip);
- return;
- }
- sendack(rp, b->ip, 0, 0);
- }
- int
- setsiaddr(uchar *siaddr, uchar *saddr, uchar *laddr)
- {
- if(ipcmp(saddr, IPnoaddr) != 0){
- v6tov4(siaddr, saddr);
- return 0;
- } else {
- v6tov4(siaddr, laddr);
- return 1;
- }
- }
- int
- ismuted(Req *rp)
- {
- return mute || (mutestat && rp->staticbinding);
- }
- void
- sendoffer(Req *rp, uchar *ip, int offer)
- {
- int n;
- ushort flags;
- Bootp *bp;
- Udphdr *up;
- bp = rp->bp;
- up = rp->up;
- /*
- * set destination
- */
- flags = nhgets(bp->flags);
- if(validip(rp->giaddr)){
- ipmove(up->raddr, rp->giaddr);
- hnputs(up->rport, 67);
- } else if(flags & Fbroadcast){
- ipmove(up->raddr, IPv4bcast);
- hnputs(up->rport, 68);
- } else {
- ipmove(up->raddr, ip);
- if(bp->htype == 1)
- arpenter(up->raddr, bp->chaddr);
- hnputs(up->rport, 68);
- }
- /*
- * fill in standard bootp part
- */
- bp->op = Bootreply;
- bp->hops = 0;
- hnputs(bp->secs, 0);
- memset(bp->ciaddr, 0, sizeof(bp->ciaddr));
- v6tov4(bp->giaddr, rp->giaddr);
- v6tov4(bp->yiaddr, ip);
- setsiaddr(bp->siaddr, rp->ii.tftp, up->laddr);
- strncpy(bp->sname, mysysname, sizeof(bp->sname));
- strncpy(bp->file, rp->ii.bootf, sizeof(bp->file));
- /*
- * set options
- */
- byteopt(rp, ODtype, Offer);
- longopt(rp, ODlease, offer);
- addropt(rp, ODserverid, up->laddr);
- miscoptions(rp, ip);
- termopt(rp);
- logdhcpout(rp, "Offer");
- /*
- * send
- */
- n = rp->p - rp->buf;
- if(!ismuted(rp) && write(rp->fd, rp->buf, n) != n)
- warning(0, "offer: write failed: %r");
- }
- void
- sendack(Req *rp, uchar *ip, int offer, int sendlease)
- {
- int n;
- ushort flags;
- Bootp *bp;
- Udphdr *up;
- bp = rp->bp;
- up = rp->up;
- /*
- * set destination
- */
- flags = nhgets(bp->flags);
- if(validip(rp->giaddr)){
- ipmove(up->raddr, rp->giaddr);
- hnputs(up->rport, 67);
- } else if(flags & Fbroadcast){
- ipmove(up->raddr, IPv4bcast);
- hnputs(up->rport, 68);
- } else {
- ipmove(up->raddr, ip);
- if(bp->htype == 1)
- arpenter(up->raddr, bp->chaddr);
- hnputs(up->rport, 68);
- }
- /*
- * fill in standard bootp part
- */
- bp->op = Bootreply;
- bp->hops = 0;
- hnputs(bp->secs, 0);
- v6tov4(bp->giaddr, rp->giaddr);
- v6tov4(bp->yiaddr, ip);
- setsiaddr(bp->siaddr, rp->ii.tftp, up->laddr);
- strncpy(bp->sname, mysysname, sizeof(bp->sname));
- strncpy(bp->file, rp->ii.bootf, sizeof(bp->file));
- /*
- * set options
- */
- byteopt(rp, ODtype, Ack);
- if(sendlease){
- longopt(rp, ODlease, offer);
- }
- addropt(rp, ODserverid, up->laddr);
- miscoptions(rp, ip);
- termopt(rp);
- logdhcpout(rp, "Ack");
- /*
- * send
- */
- n = rp->p - rp->buf;
- if(!ismuted(rp) && write(rp->fd, rp->buf, n) != n)
- warning(0, "ack: write failed: %r");
- }
- void
- sendnak(Req *rp, char *msg)
- {
- int n;
- Bootp *bp;
- Udphdr *up;
- bp = rp->bp;
- up = rp->up;
- /*
- * set destination (always broadcast)
- */
- if(validip(rp->giaddr)){
- ipmove(up->raddr, rp->giaddr);
- hnputs(up->rport, 67);
- } else {
- ipmove(up->raddr, IPv4bcast);
- hnputs(up->rport, 68);
- }
- /*
- * fill in standard bootp part
- */
- bp->op = Bootreply;
- bp->hops = 0;
- hnputs(bp->secs, 0);
- v6tov4(bp->giaddr, rp->giaddr);
- memset(bp->ciaddr, 0, sizeof(bp->ciaddr));
- memset(bp->yiaddr, 0, sizeof(bp->yiaddr));
- memset(bp->siaddr, 0, sizeof(bp->siaddr));
- /*
- * set options
- */
- byteopt(rp, ODtype, Nak);
- addropt(rp, ODserverid, up->laddr);
- if(msg)
- stringopt(rp, ODmessage, msg);
- if(strncmp(rp->id, "id", 2) == 0)
- hexopt(rp, ODclientid, rp->id+2);
- termopt(rp);
- logdhcpout(rp, "Nak");
- /*
- * send nak
- */
- n = rp->p - rp->buf;
- if(!ismuted(rp) && write(rp->fd, rp->buf, n) != n)
- warning(0, "nak: write failed: %r");
- }
- void
- bootp(Req *rp)
- {
- int n;
- Bootp *bp;
- Udphdr *up;
- ushort flags;
- Iplifc *lifc;
- Info *iip;
- warning(0, "bootp %s %I->%I from %s via %I, file %s %s",
- rp->genrequest? "generic": (rp->p9request? "p9": ""),
- rp->up->raddr, rp->up->laddr,
- rp->id, rp->gii.ipaddr,
- rp->bp->file, rp->broadcast? "broadcast": "unicast");
- if(nobootp)
- return;
- bp = rp->bp;
- up = rp->up;
- iip = &rp->ii;
- if(rp->staticbinding == 0){
- warning(0, "bootp from unknown %s via %I", rp->id, rp->gii.ipaddr);
- return;
- }
- /* ignore if not for us */
- if(*bp->sname){
- if(strcmp(bp->sname, mysysname) != 0){
- bp->sname[20] = 0;
- warning(0, "bootp for server %s", bp->sname);
- return;
- }
- } else
- slowdelay(rp);
- /* ignore if we don't know what file to load */
- if(*bp->file == 0){
- if(rp->genrequest && *iip->bootf2) /* if not plan 9 & have alternate file... */
- strncpy(bp->file, iip->bootf2, sizeof(bp->file));
- else if(*iip->bootf)
- strncpy(bp->file, iip->bootf, sizeof(bp->file));
- else if(*bp->sname) /* if we were asked, respond no matter what */
- bp->file[0] = '\0';
- else {
- warning(0, "no bootfile for %I", iip->ipaddr);
- return;
- }
- }
- /* ignore if the file is unreadable */
- if((!rp->genrequest) && bp->file[0] && access(bp->file, 4) < 0){
- warning(0, "inaccessible bootfile1 %s", bp->file);
- return;
- }
- bp->op = Bootreply;
- v6tov4(bp->yiaddr, iip->ipaddr);
- if(rp->p9request){
- warning(0, "p9bootp: %I", iip->ipaddr);
- memmove(bp->optmagic, plan9opt, 4);
- if(iip->gwip == 0)
- v4tov6(iip->gwip, bp->giaddr);
- rp->p += sprint((char*)rp->p, "%V %I %I %I", iip->ipmask+IPv4off, iip->fsip,
- iip->auip, iip->gwip);
- sprint(optbuf, "%s", (char*)(bp->optmagic));
- } else if(rp->genrequest){
- warning(0, "genericbootp: %I", iip->ipaddr);
- memmove(bp->optmagic, genericopt, 4);
- miscoptions(rp, iip->ipaddr);
- termopt(rp);
- } else if(iip->vendor[0] != 0) {
- warning(0, "bootp vendor field: %s", iip->vendor);
- memset(rp->p, 0, 128-4);
- rp->p += sprint((char*)bp->optmagic, "%s", iip->vendor);
- } else {
- memset(rp->p, 0, 128-4);
- rp->p += 128-4;
- }
- /*
- * set destination
- */
- flags = nhgets(bp->flags);
- if(validip(rp->giaddr)){
- ipmove(up->raddr, rp->giaddr);
- hnputs(up->rport, 67);
- } else if(flags & Fbroadcast){
- ipmove(up->raddr, IPv4bcast);
- hnputs(up->rport, 68);
- } else {
- v4tov6(up->raddr, bp->yiaddr);
- if(bp->htype == 1)
- arpenter(up->raddr, bp->chaddr);
- hnputs(up->rport, 68);
- }
- /*
- * select best local address if destination is directly connected
- */
- lifc = findlifc(up->raddr);
- if(lifc)
- ipmove(up->laddr, lifc->ip);
- /*
- * our identity
- */
- strncpy(bp->sname, mysysname, sizeof(bp->sname));
- /*
- * set tftp server
- */
- setsiaddr(bp->siaddr, iip->tftp, up->laddr);
- if(rp->genrequest && *iip->bootf2)
- setsiaddr(bp->siaddr, iip->tftp2, up->laddr);
- /*
- * RFC 1048 says that we must pad vendor field with
- * zeros until we have a 64 byte field.
- */
- n = rp->p - rp->bp->optdata;
- if(n < 64-4) {
- memset(rp->p, 0, (64-4)-n);
- rp->p += (64-4)-n;
- }
- /*
- * send
- */
- n = rp->p - rp->buf;
- if(!ismuted(rp) && write(rp->fd, rp->buf, n) != n)
- warning(0, "bootp: write failed: %r");
- warning(0, "bootp via %I: file %s xid(%ux)flag(%ux)ci(%V)gi(%V)yi(%V)si(%V) %s",
- up->raddr, bp->file, nhgetl(bp->xid), nhgets(bp->flags),
- bp->ciaddr, bp->giaddr, bp->yiaddr, bp->siaddr,
- optbuf);
- }
- void
- parseoptions(Req *rp)
- {
- int n, c, code;
- uchar *o, *p;
- p = rp->p;
- while(p < rp->e){
- code = *p++;
- if(code == 255)
- break;
- if(code == 0)
- continue;
- /* ignore anything that's too long */
- n = *p++;
- o = p;
- p += n;
- if(p > rp->e)
- return;
- switch(code){
- case ODipaddr: /* requested ip address */
- if(n == IPv4addrlen)
- v4tov6(rp->ip, o);
- break;
- case ODlease: /* requested lease time */
- rp->leasetime = nhgetl(o);
- if(rp->leasetime > MaxLease || rp->leasetime < 0)
- rp->leasetime = MaxLease;
- break;
- case ODtype:
- c = *o;
- if(c < 10 && c > 0)
- rp->dhcptype = c;
- break;
- case ODserverid:
- if(n == IPv4addrlen)
- v4tov6(rp->server, o);
- break;
- case ODmessage:
- if(n > sizeof rp->msg-1)
- n = sizeof rp->msg-1;
- memmove(rp->msg, o, n);
- rp->msg[n] = 0;
- break;
- case ODmaxmsg:
- c = nhgets(o);
- c -= 28;
- c += Udphdrsize;
- if(c > 0)
- rp->max = rp->buf + c;
- break;
- case ODclientid:
- if(n <= 1)
- break;
- rp->id = toid( o, n);
- break;
- case ODparams:
- if(n > sizeof(rp->requested))
- n = sizeof(rp->requested);
- memmove(rp->requested, o, n);
- break;
- case ODvendorclass:
- if(n >= sizeof(rp->vendorclass))
- n = sizeof(rp->vendorclass)-1;
- memmove(rp->vendorclass, o, n);
- rp->vendorclass[n] = 0;
- if(strncmp((char*)rp->vendorclass, "p9-", 3) == 0)
- strcpy(rp->cputype, (char*)rp->vendorclass+3);
- break;
- case OBend:
- return;
- }
- }
- }
- void
- remrequested(Req *rp, int opt)
- {
- uchar *p;
- p = memchr(rp->requested, opt, sizeof(rp->requested));
- if(p != nil)
- *p = OBpad;
- }
- void
- miscoptions(Req *rp, uchar *ip)
- {
- int i, j, na;
- uchar x[2*IPaddrlen], vopts[Maxoptlen];
- uchar *op, *omax;
- uchar *addrs[2];
- char *p;
- char *attr[100], **a;
- Ndbtuple *t;
- addrs[0] = x;
- addrs[1] = x+IPaddrlen;
- /* always supply these */
- maskopt(rp, OBmask, rp->gii.ipmask);
- if(validip(rp->gii.gwip)){
- remrequested(rp, OBrouter);
- addropt(rp, OBrouter, rp->gii.gwip);
- } else if(validip(rp->giaddr)){
- remrequested(rp, OBrouter);
- addropt(rp, OBrouter, rp->giaddr);
- }
- /*
- * OBhostname for the HP4000M switches
- * (this causes NT to log infinite errors - tough shit)
- */
- if(*rp->ii.domain){
- remrequested(rp, OBhostname);
- stringopt(rp, OBhostname, rp->ii.domain);
- }
- if(*rp->ii.rootpath)
- stringopt(rp, OBrootpath, rp->ii.rootpath);
- /* figure out what we need to lookup */
- na = 0;
- a = attr;
- if(*rp->ii.domain == 0)
- a[na++] = "dom";
- for(i = 0; i < sizeof(rp->requested); i++)
- switch(rp->requested[i]){
- case OBrouter:
- a[na++] = "@ipgw";
- break;
- case OBdnserver:
- a[na++] = "@dns";
- break;
- case OBnetbiosns:
- a[na++] = "@wins";
- break;
- case OBsmtpserver:
- a[na++] = "@smtp";
- break;
- case OBpop3server:
- a[na++] = "@pop3";
- break;
- case OBwwwserver:
- a[na++] = "@www";
- break;
- case OBntpserver:
- a[na++] = "@ntp";
- break;
- case OBtimeserver:
- a[na++] = "@time";
- break;
- }
- if(strncmp((char*)rp->vendorclass, "plan9_", 6) == 0
- || strncmp((char*)rp->vendorclass, "p9-", 3) == 0){
- a[na++] = "@fs";
- a[na++] = "@auth";
- }
- t = lookupinfo(ip, a, na);
- /* lookup anything we might be missing */
- if(*rp->ii.domain == 0)
- lookupname(rp->ii.domain, t);
- /* add any requested ones that we know about */
- for(i = 0; i < sizeof(rp->requested); i++)
- switch(rp->requested[i]){
- case OBrouter:
- j = lookupserver("ipgw", addrs, t);
- addrsopt(rp, OBrouter, addrs, j);
- break;
- case OBdnserver:
- j = lookupserver("dns", addrs, t);
- addrsopt(rp, OBdnserver, addrs, j);
- break;
- case OBhostname:
- if(*rp->ii.domain)
- stringopt(rp, OBhostname, rp->ii.domain);
- break;
- case OBdomainname:
- p = strchr(rp->ii.domain, '.');
- if(p)
- stringopt(rp, OBdomainname, p+1);
- break;
- case OBnetbiosns:
- j = lookupserver("wins", addrs, t);
- addrsopt(rp, OBnetbiosns, addrs, j);
- break;
- case OBnetbiostype:
- /* p-node: peer to peer WINS queries */
- byteopt(rp, OBnetbiostype, 0x2);
- break;
- case OBsmtpserver:
- j = lookupserver("smtp", addrs, t);
- addrsopt(rp, OBsmtpserver, addrs, j);
- break;
- case OBpop3server:
- j = lookupserver("pop3", addrs, t);
- addrsopt(rp, OBpop3server, addrs, j);
- break;
- case OBwwwserver:
- j = lookupserver("www", addrs, t);
- addrsopt(rp, OBwwwserver, addrs, j);
- break;
- case OBntpserver:
- j = lookupserver("ntp", addrs, t);
- addrsopt(rp, OBntpserver, addrs, j);
- break;
- case OBtimeserver:
- j = lookupserver("time", addrs, t);
- addrsopt(rp, OBtimeserver, addrs, j);
- break;
- case OBttl:
- byteopt(rp, OBttl, 255);
- break;
- }
- /* add plan9 specific options */
- if(strncmp((char*)rp->vendorclass, "plan9_", 6) == 0
- || strncmp((char*)rp->vendorclass, "p9-", 3) == 0){
- /* point to temporary area */
- op = rp->p;
- omax = rp->max;
- /* stash encoded options in vopts */
- rp->p = vopts;
- rp->max = vopts + sizeof(vopts) - 1;
- /* emit old v4 addresses first to make sure that they fit */
- addrsopt(rp, OP9fsv4, addrs, lookupserver("fs", addrs, t));
- addrsopt(rp, OP9authv4, addrs, lookupserver("auth", addrs, t));
- p9addrsopt(rp, OP9fs, addrs, lookupserver("fs", addrs, t));
- p9addrsopt(rp, OP9auth, addrs, lookupserver("auth", addrs, t));
- p9addrsopt(rp, OP9ipaddr, addrs, lookupserver("ip", addrs, t));
- p9addrsopt(rp, OP9ipmask, addrs, lookupserver("ipmask", addrs, t));
- p9addrsopt(rp, OP9ipgw, addrs, lookupserver("ipgw", addrs, t));
- /* point back to packet, encapsulate vopts into packet */
- j = rp->p - vopts;
- rp->p = op;
- rp->max = omax;
- vectoropt(rp, OBvendorinfo, vopts, j);
- }
- ndbfree(t);
- }
- int
- openlisten(char *net)
- {
- int fd, cfd;
- char data[128], devdir[40];
- sprint(data, "%s/udp!*!bootp", net);
- cfd = announce(data, devdir);
- if(cfd < 0)
- fatal(1, "can't announce");
- if(fprint(cfd, "headers") < 0)
- fatal(1, "can't set header mode");
- sprint(data, "%s/data", devdir);
- fd = open(data, ORDWR);
- if(fd < 0)
- fatal(1, "open udp data");
- return fd;
- }
- void
- fatal(int syserr, char *fmt, ...)
- {
- char buf[Maxloglen];
- va_list arg;
- va_start(arg, fmt);
- vseprint(buf, buf+sizeof(buf), fmt, arg);
- va_end(arg);
- if(syserr)
- syslog(1, blog, "%s: %r", buf);
- else
- syslog(1, blog, "%s", buf);
- exits(buf);
- }
- void
- warning(int syserr, char *fmt, ...)
- {
- char buf[Maxloglen];
- va_list arg;
- va_start(arg, fmt);
- vseprint(buf, buf+sizeof(buf), fmt, arg);
- va_end(arg);
- if(syserr){
- syslog(0, blog, "%s: %r", buf);
- if(debug)
- fprint(2, "%s: %r\n", buf);
- } else {
- syslog(0, blog, "%s", buf);
- if(debug)
- fprint(2, "%s\n", buf);
- }
- }
- char*
- readsysname(void)
- {
- static char name[128];
- char *p;
- int n, fd;
- fd = open("/dev/sysname", OREAD);
- if(fd >= 0){
- n = read(fd, name, sizeof(name)-1);
- close(fd);
- if(n > 0){
- name[n] = 0;
- return name;
- }
- }
- p = getenv("sysname");
- if(p == nil || *p == 0)
- return "unknown";
- return p;
- }
- extern int
- validip(uchar *ip)
- {
- if(ipcmp(ip, IPnoaddr) == 0)
- return 0;
- if(ipcmp(ip, v4prefix) == 0)
- return 0;
- return 1;
- }
- void
- longopt(Req *rp, int t, long v)
- {
- if(rp->p + 6 > rp->max)
- return;
- *rp->p++ = t;
- *rp->p++ = 4;
- hnputl(rp->p, v);
- rp->p += 4;
- op = seprint(op, oe, "%s(%ld)", optname[t], v);
- }
- void
- addropt(Req *rp, int t, uchar *ip)
- {
- if(rp->p + 6 > rp->max)
- return;
- if (!isv4(ip)) {
- if (debug)
- warning(0, "not a v4 %s server: %I", optname[t], ip);
- return;
- }
- *rp->p++ = t;
- *rp->p++ = 4;
- memmove(rp->p, ip+IPv4off, 4);
- rp->p += 4;
- op = seprint(op, oe, "%s(%I)", optname[t], ip);
- }
- void
- maskopt(Req *rp, int t, uchar *ip)
- {
- if(rp->p + 6 > rp->max)
- return;
- *rp->p++ = t;
- *rp->p++ = 4;
- memmove(rp->p, ip+IPv4off, 4);
- rp->p += 4;
- op = seprint(op, oe, "%s(%M)", optname[t], ip);
- }
- void
- addrsopt(Req *rp, int t, uchar **ip, int i)
- {
- int v4s, n;
- if(i <= 0)
- return;
- if(rp->p + 2 + 4*i > rp->max)
- return;
- v4s = 0;
- for(n = i; n-- > 0; )
- if (isv4(ip[n]))
- v4s++;
- if (v4s <= 0) {
- if (debug)
- warning(0, "no v4 %s servers", optname[t]);
- return;
- }
- *rp->p++ = t;
- *rp->p++ = 4*v4s;
- op = seprint(op, oe, " %s(", optname[t]);
- while(i-- > 0){
- if (!isv4(*ip)) {
- op = seprint(op, oe, " skipping %I ", *ip);
- continue;
- }
- v6tov4(rp->p, *ip);
- rp->p += 4;
- op = seprint(op, oe, "%I", *ip);
- ip++;
- if(i > 0)
- op = seprint(op, oe, " ");
- }
- op = seprint(op, oe, ")");
- }
- void
- p9addrsopt(Req *rp, int t, uchar **ip, int i)
- {
- char *pkt, *payload;
- if(i <= 0 || !v6opts)
- return;
- pkt = (char *)rp->p;
- *pkt++ = t; /* option */
- pkt++; /* fill in payload length below */
- payload = pkt;
- *pkt++ = i; /* plan 9 address count */
- op = seprint(op, oe, " %s(", optname[t]);
- while(i-- > 0){
- pkt = seprint(pkt, (char *)rp->max, "%I", *ip);
- if ((uchar *)pkt+1 >= rp->max) {
- op = seprint(op, oe, "<out of mem1>)");
- return;
- }
- pkt++; /* leave NUL as terminator */
- op = seprint(op, oe, "%I", *ip);
- ip++;
- if(i > 0)
- op = seprint(op, oe, " ");
- }
- if ((uchar *)pkt - rp->p > 0377) {
- op = seprint(op, oe, "<out of mem2>)");
- return;
- }
- op = seprint(op, oe, ")");
- rp->p[1] = pkt - payload; /* payload length */
- rp->p = (uchar *)pkt;
- }
- void
- byteopt(Req *rp, int t, uchar v)
- {
- if(rp->p + 3 > rp->max)
- return;
- *rp->p++ = t;
- *rp->p++ = 1;
- *rp->p++ = v;
- op = seprint(op, oe, "%s(%d)", optname[t], v);
- }
- void
- termopt(Req *rp)
- {
- if(rp->p + 1 > rp->max)
- return;
- *rp->p++ = OBend;
- }
- void
- stringopt(Req *rp, int t, char *str)
- {
- int n;
- n = strlen(str);
- if(n > 255)
- n = 255;
- if(rp->p+n+2 > rp->max)
- return;
- *rp->p++ = t;
- *rp->p++ = n;
- memmove(rp->p, str, n);
- rp->p += n;
- op = seprint(op, oe, "%s(%s)", optname[t], str);
- }
- void
- vectoropt(Req *rp, int t, uchar *v, int n)
- {
- int i;
- if(n > 255) {
- n = 255;
- op = seprint(op, oe, "vectoropt len %d > 255 ", n);
- }
- if(rp->p+n+2 > rp->max)
- return;
- *rp->p++ = t;
- *rp->p++ = n;
- memmove(rp->p, v, n);
- rp->p += n;
- op = seprint(op, oe, "%s(", optname[t]);
- if(n > 0)
- op = seprint(op, oe, "%ud", v[0]);
- for(i = 1; i < n; i++)
- op = seprint(op, oe, " %ud", v[i]);
- op = seprint(op, oe, ")");
- }
- int
- fromhex(int x)
- {
- if(x >= '0' && x <= '9')
- return x - '0';
- return x - 'a';
- }
- void
- hexopt(Req *rp, int t, char *str)
- {
- int n;
- n = strlen(str);
- n /= 2;
- if(n > 255)
- n = 255;
- if(rp->p+n+2 > rp->max)
- return;
- *rp->p++ = t;
- *rp->p++ = n;
- while(n-- > 0){
- *rp->p++ = (fromhex(str[0])<<4)|fromhex(str[1]);
- str += 2;
- }
- op = seprint(op, oe, "%s(%s)", optname[t], str);
- }
- void
- arpenter(uchar *ip, uchar *ether)
- {
- int f;
- char buf[256];
- sprint(buf, "%s/arp", net);
- f = open(buf, OWRITE);
- if(f < 0){
- syslog(debug, blog, "open %s: %r", buf);
- return;
- }
- fprint(f, "add ether %I %E", ip, ether);
- close(f);
- }
- char *dhcpmsgname[] =
- {
- [Discover] "Discover",
- [Offer] "Offer",
- [Request] "Request",
- [Decline] "Decline",
- [Ack] "Ack",
- [Nak] "Nak",
- [Release] "Release",
- [Inform] "Inform",
- };
- void
- logdhcp(Req *rp)
- {
- char buf[4096];
- char *p, *e;
- int i;
- p = buf;
- e = buf + sizeof(buf);
- if(rp->dhcptype > 0 && rp->dhcptype <= Inform)
- p = seprint(p, e, "%s(", dhcpmsgname[rp->dhcptype]);
- else
- p = seprint(p, e, "%d(", rp->dhcptype);
- p = seprint(p, e, "%I->%I) xid(%ux)flag(%ux)", rp->up->raddr, rp->up->laddr,
- nhgetl(rp->bp->xid), nhgets(rp->bp->flags));
- if(rp->bp->htype == 1)
- p = seprint(p, e, "ea(%E)", rp->bp->chaddr);
- if(validip(rp->ciaddr))
- p = seprint(p, e, "ci(%I)", rp->ciaddr);
- if(validip(rp->giaddr))
- p = seprint(p, e, "gi(%I)", rp->giaddr);
- if(validip(rp->ip))
- p = seprint(p, e, "ip(%I)", rp->ip);
- if(rp->id != nil)
- p = seprint(p, e, "id(%s)", rp->id);
- if(rp->leasetime)
- p = seprint(p, e, "leas(%d)", rp->leasetime);
- if(validip(rp->server))
- p = seprint(p, e, "sid(%I)", rp->server);
- p = seprint(p, e, "need(");
- for(i = 0; i < sizeof(rp->requested); i++)
- if(rp->requested[i] != 0)
- p = seprint(p, e, "%s ", optname[rp->requested[i]]);
- p = seprint(p, e, ")");
- p = seprint(p, e, " %s", rp->broadcast? "broadcast": "unicast");
- USED(p);
- syslog(0, blog, "%s", buf);
- }
- void
- logdhcpout(Req *rp, char *type)
- {
- syslog(0, blog, "%s(%I-%I)id(%s)ci(%V)gi(%V)yi(%V)si(%V) %s",
- type, rp->up->laddr, rp->up->raddr, rp->id,
- rp->bp->ciaddr, rp->bp->giaddr, rp->bp->yiaddr, rp->bp->siaddr, optbuf);
- }
- /*
- * if we get behind, it's useless to try answering since the sender
- * will probably have retransmitted with a differnt sequence number.
- * So dump all but the last message in the queue.
- */
- void
- ding(void*, char *msg)
- {
- if(strstr(msg, "alarm"))
- noted(NCONT);
- else
- noted(NDFLT);
- }
- int
- readlast(int fd, uchar *buf, int len)
- {
- int lastn, n;
- notify(ding);
- lastn = 0;
- for(;;){
- alarm(20);
- n = read(fd, buf, len);
- alarm(0);
- if(n < 0){
- if(lastn > 0)
- return lastn;
- break;
- }
- lastn = n;
- }
- return read(fd, buf, len);
- }
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