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- #include <u.h>
- #include <libc.h>
- #include <ip.h>
- #include "dat.h"
- #include "protos.h"
- typedef struct Hdr Hdr;
- struct Hdr
- {
- uchar vi; /* version */
- uchar type;
- uchar len[2]; /* length of data following this header */
- };
- enum
- {
- EAPOLHDR= 4, /* sizeof(Hdr) */
- /* eapol types */
- Eap = 0,
- Start,
- Logoff,
- Key,
- AsfAlert,
- };
- enum
- {
- Ot, /* type */
- };
- static Mux p_mux[] =
- {
- { "eap", Eap, },
- { "eapol_start", Start, },
- { "eapol_logoff", Logoff, },
- { "eapol_key", Key, },
- { "asf_alert", AsfAlert, },
- { 0 }
- };
- static void
- p_compile(Filter *f)
- {
- Mux *m;
- 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 eapol field or type: %s", f->s);
- }
- static int
- p_filter(Filter *f, Msg *m)
- {
- Hdr *h;
- if(m->pe - m->ps < EAPOLHDR)
- return 0;
- h = (Hdr*)m->ps;
- /* len does not include header */
- m->ps += EAPOLHDR;
- switch(f->subop){
- case Ot:
- return h->type == f->ulv;
- }
- return 0;
- }
- static char*
- op(int i)
- {
- static char x[20];
- switch(i){
- case Eap:
- return "Eap";
- case Start:
- return "Start";
- case Logoff:
- return "Logoff";
- case Key:
- return "Key";
- case AsfAlert:
- return "AsfAlert";
- default:
- sprint(x, "%1d", i);
- return x;
- }
- }
- static int
- p_seprint(Msg *m)
- {
- Hdr *h;
- int len;
- if(m->pe - m->ps < EAPOLHDR)
- return -1;
- h = (Hdr*)m->ps;
- /* len does not include header */
- m->ps += EAPOLHDR;
- /* truncate the message if there's extra */
- len = NetS(h->len);
- if(m->ps + len < m->pe)
- m->pe = m->ps + len;
- else if(m->ps+len > m->pe)
- return -1;
- /* next protocol depending on type*/
- demux(p_mux, h->type, h->type, m, &dump);
- m->p = seprint(m->p, m->e, "type=%s version=%1d datalen=%1d",
- op(h->type), h->vi, len);
- return 0;
- }
- Proto eapol =
- {
- "eapol",
- p_compile,
- p_filter,
- p_seprint,
- p_mux,
- "%lud",
- nil,
- defaultframer,
- };
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