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ip/ipconfig: refactor plan9 vendor parsing

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Unless ip/dhcpd is started with the -6 option,
we only receive v4 addresses. If we do see the
v6 options we should prefer them but should
also make sure we grab the v4 addresses as a fallback.

None of the v6 options should overwrite valid
overrides given at the command line.

Add our custom types to logging.
This commit is contained in:
Jacob Moody 2022-06-05 20:56:57 +00:00
parent 207d124dfe
commit df92301d8f
1 changed files with 37 additions and 33 deletions
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64
sys/src/cmd/ip/ipconfig/dhcp.c
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@ -18,6 +18,7 @@ enum
Tulong,
Tvec,
Tnames,
Tp9addrs,
};
typedef struct Option Option;
@ -93,6 +94,7 @@ static Option option[256] =
[OBircserver] { "irc", Taddrs },
[OBstserver] { "st", Taddrs },
[OBstdaserver] { "stdar", Taddrs },
[OBvendorinfo] { "vendorinfo", Tvec },
[ODipaddr] { "ipaddr", Taddr },
[ODlease] { "lease", Tulong },
@ -109,6 +111,14 @@ static Option option[256] =
[ODtftpserver] { "tftp", Tstr },
[ODbootfile] { "bootfile", Tstr },
[ODdnsdomain] { "dnsdomain", Tnames },
[OP9authv4] { "p9authv4", Taddrs },
[OP9fsv4] { "p9fsv4", Taddrs },
[OP9fs] { "p9fs", Tp9addrs },
[OP9auth] { "p9auth", Tp9addrs },
[OP9ipaddr] { "p9ipaddr", Tp9addrs },
[OP9ipmask] { "p9ipmask", Tp9addrs },
[OP9ipgw] { "p9ipgw", Tp9addrs },
};
static uchar defrequested[] = {
@ -414,7 +424,7 @@ dhcprecv(void)
int i, n, type;
ulong lease;
char err[ERRMAX];
uchar buf[8000], vopts[256], taddr[IPaddrlen];
uchar buf[8000], vopts[256], taddr[IPaddrlen*2];
Bootp *bp;
memset(buf, 0, sizeof buf);
@ -544,39 +554,33 @@ dhcprecv(void)
/* get plan9-specific options */
n = optgetvec(bp->optdata, OBvendorinfo, vopts, sizeof vopts-1);
if(n > 0 && parseoptions(vopts, n) == 0){
if(validip(conf.fs) && Oflag)
n = 1;
else {
n = optgetp9addrs(vopts, OP9fs, conf.fs, 2);
if (n == 0)
n = optgetaddrs(vopts, OP9fsv4,
conf.fs, 2);
if(!(Oflag && validip(conf.fs))){
n = optgetp9addrs(vopts, OP9fs, taddr, 2);
if(n < 2)
n += optgetaddrs(vopts, OP9fsv4, taddr + (n * IPaddrlen), 2 - n);
memmove(conf.fs, taddr, n * IPaddrlen);
}
for(i = 0; i < n; i++)
DEBUG("fs=%I ", conf.fs + i*IPaddrlen);
if(validip(conf.auth) && Oflag)
n = 1;
else {
n = optgetp9addrs(vopts, OP9auth, conf.auth, 2);
if (n == 0)
n = optgetaddrs(vopts, OP9authv4,
conf.auth, 2);
if(!(Oflag && validip(conf.auth))){
n = optgetp9addrs(vopts, OP9auth, taddr, 2);
if(n < 2)
n += optgetaddrs(vopts, OP9authv4, taddr + (n * IPaddrlen), 2 - n);
memmove(conf.auth, taddr, n * IPaddrlen);
}
for(i = 0; i < n; i++)
DEBUG("auth=%I ", conf.auth + i*IPaddrlen);
DEBUG("fs=(%I %I) auth=(%I %I)", conf.fs, conf.fs + IPaddrlen, conf.auth , conf.auth + IPaddrlen);
n = optgetp9addrs(vopts, OP9ipaddr, taddr, 1);
if (n > 0)
if(!(Oflag && validip(conf.laddr)))
if(optgetp9addrs(vopts, OP9ipaddr, taddr, 1))
ipmove(conf.laddr, taddr);
n = optgetp9addrs(vopts, OP9ipmask, taddr, 1);
if (n > 0)
if(!(Oflag && validip(conf.mask)))
if(optgetp9addrs(vopts, OP9ipmask, taddr, 1))
ipmove(conf.mask, taddr);
n = optgetp9addrs(vopts, OP9ipgw, taddr, 1);
if (n > 0)
if(!(Oflag && validip(conf.gaddr)))
if(optgetp9addrs(vopts, OP9ipgw, taddr, 1))
ipmove(conf.gaddr, taddr);
DEBUG("new ipaddr=%I new ipmask=%M new ipgw=%I",
conf.laddr, conf.mask, conf.gaddr);
DEBUG("p9 opt ipaddr=%I ipmask=%M ipgw=%I", conf.laddr, conf.mask, conf.gaddr);
}
conf.lease = lease;
conf.state = Sbound;
@ -779,8 +783,8 @@ optgetp9addrs(uchar *ap, int op, uchar *ip, int n)
slen = strlen(p) + 1;
if (parseip(&ip[i*IPaddrlen], p) == -1)
fprint(2, "%s: bad address %s\n", argv0, p);
DEBUG("got plan 9 option %d addr %I (%s)",
op, &ip[i*IPaddrlen], p);
DEBUG("got plan 9 option %s addr %I (%s)",
option[op].name, &ip[i*IPaddrlen], p);
p += slen;
len -= slen;
}