static int chap_print_pkt(const unsigned char *p, int plen,
void (*printer) (void *, const char *, ...), void *arg) {
int code, id, len;
int clen, nlen;
unsigned char x;
if (plen < CHAP_HDRLEN)
return 0;
GETCHAR(code, p);
GETCHAR(id, p);
GETSHORT(len, p);
if (len < CHAP_HDRLEN || len > plen)
return 0;
if (code >= 1 && code <= (int)sizeof(chap_code_names) / (int)sizeof(char *))
printer(arg, " %s", chap_code_names[code-1]);
else
printer(arg, " code=0x%x", code);
printer(arg, " id=0x%x", id);
len -= CHAP_HDRLEN;
switch (code) {
case CHAP_CHALLENGE:
case CHAP_RESPONSE:
if (len < 1)
break;
clen = p[0];
if (len < clen + 1)
break;
++p;
nlen = len - clen - 1;
printer(arg, " <");
for (; clen > 0; --clen) {
GETCHAR(x, p);
printer(arg, "%.2x", x);
}
printer(arg, ">, name = ");
ppp_print_string(p, nlen, printer, arg);
break;
case CHAP_FAILURE:
case CHAP_SUCCESS:
printer(arg, " ");
ppp_print_string(p, len, printer, arg);
break;
default:
for (clen = len; clen > 0; --clen) {
GETCHAR(x, p);
printer(arg, " %.2x", x);
}
/* no break */
}
return len + CHAP_HDRLEN;
}
static int upap_printpkt(const u_char *p, int plen, void (*printer) (void *, const char *, ...), void *arg) {
int code, id, len;
int mlen, ulen, wlen;
const u_char *user, *pwd, *msg;
const u_char *pstart;
if (plen < UPAP_HEADERLEN)
return 0;
pstart = p;
GETCHAR(code, p);
GETCHAR(id, p);
GETSHORT(len, p);
if (len < UPAP_HEADERLEN || len > plen)
return 0;
if (code >= 1 && code <= (int)LWIP_ARRAYSIZE(upap_codenames))
printer(arg, " %s", upap_codenames[code-1]);
else
printer(arg, " code=0x%x", code);
printer(arg, " id=0x%x", id);
len -= UPAP_HEADERLEN;
switch (code) {
case UPAP_AUTHREQ:
if (len < 1)
break;
ulen = p[0];
if (len < ulen + 2)
break;
wlen = p[ulen + 1];
if (len < ulen + wlen + 2)
break;
user = (const u_char *) (p + 1);
pwd = (const u_char *) (p + ulen + 2);
p += ulen + wlen + 2;
len -= ulen + wlen + 2;
printer(arg, " user="******" password="******"<hidden>");
#endif
break;
case UPAP_AUTHACK:
case UPAP_AUTHNAK:
if (len < 1)
break;
mlen = p[0];
if (len < mlen + 1)
break;
msg = (const u_char *) (p + 1);
p += mlen + 1;
len -= mlen + 1;
printer(arg, " ");
ppp_print_string(msg, mlen, printer, arg);
break;
default:
break;
}
/* print the rest of the bytes in the packet */
for (; len > 0; --len) {
GETCHAR(code, p);
printer(arg, " %.2x", code);
}
return p - pstart;
}
