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- #include <u.h>
- #include <libc.h>
- #include <ip.h>
- #include "dat.h"
- #include "protos.h"
- enum
- {
- OfferTimeout= 60, /* when an offer times out */
- MaxLease= 60*60, /* longest lease for dynamic binding */
- MinLease= 15*60, /* shortest lease for dynamic binding */
- StaticLease= 30*60, /* lease for static binding */
- IPUDPHDRSIZE= 28, /* size of an IP plus UDP header */
- MINSUPPORTED= 576, /* biggest IP message the client must support */
- /* lengths of some bootp fields */
- Maxhwlen= 16,
- Maxfilelen= 128,
- Maxoptlen= 312-4,
- /* bootp types */
- Bootrequest= 1,
- Bootreply= 2,
- /* bootp flags */
- Fbroadcast= 1<<15,
- };
- typedef struct Hdr Hdr;
- struct Hdr
- {
- uchar op; /* opcode */
- uchar htype; /* hardware type */
- uchar hlen; /* hardware address len */
- uchar hops; /* hops */
- uchar xid[4]; /* a random number */
- uchar secs[2]; /* elapsed since client started booting */
- uchar flags[2];
- uchar ciaddr[IPv4addrlen]; /* client IP address (client tells server) */
- uchar yiaddr[IPv4addrlen]; /* client IP address (server tells client) */
- uchar siaddr[IPv4addrlen]; /* server IP address */
- uchar giaddr[IPv4addrlen]; /* gateway IP address */
- uchar chaddr[Maxhwlen]; /* client hardware address */
- char sname[64]; /* server host name (optional) */
- char file[Maxfilelen]; /* boot file name */
- uchar optmagic[4];
- uchar optdata[Maxoptlen];
- };
- enum
- {
- Oca,
- Osa,
- Ot,
- };
- static Field p_fields[] =
- {
- {"ca", Fv4ip, Oca, "client IP addr", } ,
- {"sa", Fv4ip, Osa, "server IP addr", } ,
- {0}
- };
- #define plan9opt ((ulong)(('p'<<24) | ('9'<<16) | (' '<<8) | ' '))
- #define genericopt (0x63825363UL)
- static Mux p_mux[] =
- {
- {"dhcp", genericopt,},
- {"plan9bootp", plan9opt,},
- {"dump", 0,},
- {0}
- };
- static void
- p_compile(Filter *f)
- {
- Mux *m;
- if(f->op == '='){
- compile_cmp(bootp.name, f, p_fields);
- return;
- }
- for(m = p_mux; m->name != nil; m++)
- if(strcmp(f->s, m->name) == 0){
- f->pr = m->pr;
- f->ulv = m->val;
- f->subop = Ot;
- return;
- }
- sysfatal("unknown bootp field: %s", f->s);
- }
- static int
- p_filter(Filter *f, Msg *m)
- {
- Hdr *h;
- h = (Hdr*)m->ps;
- if(m->pe < (uchar*)h->sname)
- return 0;
- m->ps = h->optdata;
- switch(f->subop){
- case Oca:
- return NetL(h->ciaddr) == f->ulv || NetL(h->yiaddr) == f->ulv;
- case Osa:
- return NetL(h->siaddr) == f->ulv;
- case Ot:
- return NetL(h->optmagic) == f->ulv;
- }
- return 0;
- }
- static char*
- op(int i)
- {
- static char x[20];
- switch(i){
- case Bootrequest:
- return "Req";
- case Bootreply:
- return "Rep";
- default:
- sprint(x, "%d", i);
- return x;
- }
- }
- static int
- p_seprint(Msg *m)
- {
- Hdr *h;
- ulong x;
- h = (Hdr*)m->ps;
- if(m->pe < (uchar*)h->sname)
- return -1;
- /* point past data */
- m->ps = h->optdata;
- /* next protocol */
- m->pr = nil;
- if(m->pe >= (uchar*)h->optdata){
- x = NetL(h->optmagic);
- demux(p_mux, x, x, m, &dump);
- }
- m->p = seprint(m->p, m->e, "t=%s ht=%d hl=%d hp=%d xid=%ux sec=%d fl=%4.4ux ca=%V ya=%V sa=%V ga=%V cha=%E magic=%lux",
- op(h->op), h->htype, h->hlen, h->hops,
- NetL(h->xid), NetS(h->secs), NetS(h->flags),
- h->ciaddr, h->yiaddr, h->siaddr, h->giaddr, h->chaddr,
- (ulong)NetL(h->optmagic));
- if(m->pe > (uchar*)h->sname && *h->sname)
- m->p = seprint(m->p, m->e, " snam=%s", h->sname);
- if(m->pe > (uchar*)h->file && *h->file)
- m->p = seprint(m->p, m->e, " file=%s", h->file);
- return 0;
- }
- Proto bootp =
- {
- "bootp",
- p_compile,
- p_filter,
- p_seprint,
- p_mux,
- "%#.8lux",
- p_fields,
- defaultframer,
- };
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