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ip/dhcpd: impvoe validip(), make validipmask() reject ipv6 masks

Browse source 
Because isv4() is never true for IPnoaddr,
we can skip the check.

Make validipmask() ensure that the top IPv4off
bytes are all 0xff, then check that the low
4 bytes are a valid mask (must be a power
of two minus one).
This commit is contained in:
cinap_lenrek 2024-12-23 16:12:35 +00:00
parent 248634879a
commit 1a91932731
5 changed files with 31 additions and 31 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
sys/src/cmd/ip/dhcpd/dat.h
View file

@ -49,8 +49,6 @@ struct Info
/* from dhcp.c */
extern int validip(uchar*);
extern int validipmask(uchar*);
extern void fatal(char*, ...);
extern void warning(char*, ...);
#pragma varargck argpos fatal 1
@ -58,6 +56,8 @@ extern void warning(char*, ...);
extern int minlease;
/* from db.c */
extern int validip(uchar*);
extern int validipmask(uchar*);
extern char* toid(uchar*, int);
extern void initbinding(uchar*, int);
extern Binding* iptobinding(uchar*, int);

19
sys/src/cmd/ip/dhcpd/db.c
View file

@ -412,3 +412,22 @@ releasebinding(Binding *b, char *id)
close(fd);
return 0;
}
int
validip(uchar *ip)
{
if(ipcmp(ip, v4prefix) == 0)
return 0;
return isv4(ip);
}
int
validipmask(uchar *mask)
{
unsigned x;
if(memcmp(mask, IPallbits, IPv4off) != 0)
return 0;
x = ~(mask[IPv4off+0] << 24 | mask[IPv4off+1] << 16 | mask[IPv4off+2] << 8 | mask[IPv4off+3]);
return ((x + 1U) & x) == 0;
}

21
sys/src/cmd/ip/dhcpd/dhcpd.c
View file

@ -191,7 +191,6 @@ void sendnak(Req*, uchar*, char*);
void sendoffer(Req*, uchar*, int);
void stringopt(Req*, int, char*);
void termopt(Req*);
int validip(uchar*);
void vectoropt(Req*, int, uchar*, int);
void
@ -1389,26 +1388,6 @@ readsysname(void)
return p;
}
extern int
validip(uchar *ip)
{
if(ipcmp(ip, IPnoaddr) == 0)
return 0;
if(ipcmp(ip, v4prefix) == 0)
return 0;
return isv4(ip);
}
extern int
validipmask(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)
{

4
sys/src/cmd/ip/dhcpd/dhcpleases.c
View file

@ -35,7 +35,9 @@ main(void)
b.lease = b.offer = 0;
now = time(0);
for(i = 0; i < nall; i++){
if(parseip(b.ip, all[i].name) == -1 || syncbinding(&b, 0) < 0)
if(parseip(b.ip, all[i].name) == -1
|| !validip(b.ip)
|| syncbinding(&b, 0) < 0)
continue;
if(b.lease > now)
print("%I leased by %s until %s", b.ip, b.boundto,

14
sys/src/cmd/ip/dhcpd/ndb.c
View file

@ -57,19 +57,19 @@ localip(uchar *laddr, uchar *raddr, Ipifc *ifc)
}
static void
setipaddr(uchar *addr, char *ip)
setipaddr(uchar *ip, char *s)
{
if(ipcmp(addr, IPnoaddr) == 0)
if(parseip(addr, ip) == -1
|| !validip(addr))
ipmove(addr, IPnoaddr); /* invalid */
if(ipcmp(ip, IPnoaddr) == 0)
if(parseip(ip, s) == -1
|| !validip(ip))
ipmove(ip, IPnoaddr); /* invalid */
}
static void
setipmask(uchar *mask, char *ip)
setipmask(uchar *mask, char *s)
{
if(ipcmp(mask, IPnoaddr) == 0)
if(parseipmask(mask, ip, 1) == -1
if(parseipmask(mask, s, 1) == -1
|| !validipmask(mask))
ipmove(mask, IPnoaddr); /* invalid */
}