ip/dhcpd: parseip() error handling, make sure client ip is ipv4, add explicit length arguments to lookupname() and lookupserver()
This commit is contained in:
cinap_lenrek
parent
0cf8a0c4a8
commit
182077ac24
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@ -67,10 +67,10 @@ extern int syncbinding(Binding*, int);
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/* from ndb.c */
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extern int lookup(Bootp*, Info*, Info*);
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extern int lookupip(uchar*, Info*, int);
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extern void lookupname(char*, Ndbtuple*);
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extern void lookupname(char*, int, Ndbtuple*);
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extern Iplifc* findlifc(uchar*);
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extern int forme(uchar*);
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extern int lookupserver(char*, uchar**, Ndbtuple *t);
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extern int lookupserver(char*, uchar**, int, Ndbtuple *t);
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extern Ndbtuple* lookupinfo(uchar *ipaddr, char **attr, int n);
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/* from icmp.c */
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@ -51,7 +51,7 @@ struct Req
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#define TFTP "/lib/tftpd"
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char *blog = "ipboot";
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char mysysname[64];
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char *mysysname;
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Ipifc *ipifcs;
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int debug;
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int nobootp;
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@ -273,8 +273,7 @@ main(int argc, char **argv)
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} ARGEND;
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while(argc > 1){
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parseip(ip, argv[0]);
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if(!validip(ip))
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if(parseip(ip, argv[0]) == -1 || !validip(ip))
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usage();
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n = atoi(argv[1]);
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if(n <= 0)
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@ -290,7 +289,7 @@ main(int argc, char **argv)
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optname[i] = smprint("%d", i);
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/* what is my name? */
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strcpy(mysysname, readsysname());
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mysysname = readsysname();
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/* put process in background */
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if(!debug)
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@ -554,7 +553,7 @@ rcvrequest(Req *rp)
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*/
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/* check for hard assignment */
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if(rp->staticbinding){
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if(memcmp(rp->ip, rp->ii.ipaddr, IPaddrlen) != 0){
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if(ipcmp(rp->ip, rp->ii.ipaddr) != 0){
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warning(0, "!Request(%s via %I): %I not valid for %E",
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rp->id, rp->gii.ipaddr, rp->ip, rp->bp->chaddr);
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sendnak(rp, "not valid");
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@ -577,7 +576,7 @@ rcvrequest(Req *rp)
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rp->id, rp->gii.ipaddr, rp->ip);
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return;
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}
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if(memcmp(rp->ip, b->ip, IPaddrlen) != 0 || now > b->lease){
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if(ipcmp(rp->ip, b->ip) != 0 || now > b->lease){
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warning(0, "!Request(%s via %I): %I not valid",
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rp->id, rp->gii.ipaddr, rp->ip);
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sendnak(rp, "not valid");
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@ -1109,7 +1108,7 @@ parseoptions(Req *rp)
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memmove(rp->vendorclass, o, n);
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rp->vendorclass[n] = 0;
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if(strncmp((char*)rp->vendorclass, "p9-", 3) == 0)
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strcpy(rp->cputype, (char*)rp->vendorclass+3);
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strncpy(rp->cputype, (char*)rp->vendorclass+3, sizeof(rp->cputype));
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break;
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case OBend:
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return;
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@ -1131,15 +1130,15 @@ void
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miscoptions(Req *rp, uchar *ip)
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{
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int i, j, na;
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uchar x[2*IPaddrlen], vopts[Maxoptlen];
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uchar *addrs[8];
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uchar *op, *omax;
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uchar *addrs[2];
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uchar x[nelem(addrs)*IPaddrlen], vopts[Maxoptlen];
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char *p;
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char *attr[100], **a;
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Ndbtuple *t;
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addrs[0] = x;
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addrs[1] = x+IPaddrlen;
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for(i=0; i<nelem(addrs); i++)
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addrs[i] = &x[i*IPaddrlen];
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/* always supply these */
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maskopt(rp, OBmask, rp->gii.ipmask);
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@ -1203,17 +1202,17 @@ miscoptions(Req *rp, uchar *ip)
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/* lookup anything we might be missing */
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if(*rp->ii.domain == 0)
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lookupname(rp->ii.domain, t);
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lookupname(rp->ii.domain, sizeof(rp->ii.domain), t);
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/* add any requested ones that we know about */
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for(i = 0; i < sizeof(rp->requested); i++)
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switch(rp->requested[i]){
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case OBrouter:
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j = lookupserver("ipgw", addrs, t);
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j = lookupserver("ipgw", addrs, nelem(addrs), t);
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addrsopt(rp, OBrouter, addrs, j);
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break;
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case OBdnserver:
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j = lookupserver("dns", addrs, t);
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j = lookupserver("dns", addrs, nelem(addrs), t);
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addrsopt(rp, OBdnserver, addrs, j);
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break;
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case OBhostname:
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@ -1222,11 +1221,11 @@ miscoptions(Req *rp, uchar *ip)
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break;
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case OBdomainname:
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p = strchr(rp->ii.domain, '.');
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if(p)
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if(p != nil)
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stringopt(rp, OBdomainname, p+1);
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break;
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case OBnetbiosns:
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j = lookupserver("wins", addrs, t);
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j = lookupserver("wins", addrs, nelem(addrs), t);
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addrsopt(rp, OBnetbiosns, addrs, j);
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break;
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case OBnetbiostype:
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@ -1234,23 +1233,23 @@ miscoptions(Req *rp, uchar *ip)
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byteopt(rp, OBnetbiostype, 0x2);
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break;
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case OBsmtpserver:
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j = lookupserver("smtp", addrs, t);
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j = lookupserver("smtp", addrs, nelem(addrs), t);
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addrsopt(rp, OBsmtpserver, addrs, j);
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break;
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case OBpop3server:
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j = lookupserver("pop3", addrs, t);
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j = lookupserver("pop3", addrs, nelem(addrs), t);
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addrsopt(rp, OBpop3server, addrs, j);
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break;
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case OBwwwserver:
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j = lookupserver("www", addrs, t);
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j = lookupserver("www", addrs, nelem(addrs), t);
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addrsopt(rp, OBwwwserver, addrs, j);
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break;
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case OBntpserver:
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j = lookupserver("ntp", addrs, t);
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j = lookupserver("ntp", addrs, nelem(addrs), t);
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addrsopt(rp, OBntpserver, addrs, j);
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break;
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case OBtimeserver:
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j = lookupserver("time", addrs, t);
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j = lookupserver("time", addrs, nelem(addrs), t);
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addrsopt(rp, OBtimeserver, addrs, j);
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break;
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case OBttl:
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@ -1269,14 +1268,14 @@ miscoptions(Req *rp, uchar *ip)
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rp->max = vopts + sizeof(vopts) - 1;
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/* emit old v4 addresses first to make sure that they fit */
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addrsopt(rp, OP9fsv4, addrs, lookupserver("fs", addrs, t));
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addrsopt(rp, OP9authv4, addrs, lookupserver("auth", addrs, t));
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addrsopt(rp, OP9fsv4, addrs, lookupserver("fs", addrs, nelem(addrs), t));
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addrsopt(rp, OP9authv4, addrs, lookupserver("auth", addrs, nelem(addrs), t));
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p9addrsopt(rp, OP9fs, addrs, lookupserver("fs", addrs, t));
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p9addrsopt(rp, OP9auth, addrs, lookupserver("auth", addrs, t));
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p9addrsopt(rp, OP9ipaddr, addrs, lookupserver("ip", addrs, t));
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p9addrsopt(rp, OP9ipmask, addrs, lookupserver("ipmask", addrs, t));
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p9addrsopt(rp, OP9ipgw, addrs, lookupserver("ipgw", addrs, t));
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p9addrsopt(rp, OP9fs, addrs, lookupserver("fs", addrs, nelem(addrs), t));
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p9addrsopt(rp, OP9auth, addrs, lookupserver("auth", addrs, nelem(addrs), t));
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p9addrsopt(rp, OP9ipaddr, addrs, lookupserver("ip", addrs, nelem(addrs), t));
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p9addrsopt(rp, OP9ipmask, addrs, lookupserver("ipmask", addrs, nelem(addrs), t));
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p9addrsopt(rp, OP9ipgw, addrs, lookupserver("ipgw", addrs, nelem(addrs), t));
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/* point back to packet, encapsulate vopts into packet */
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j = rp->p - vopts;
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@ -40,12 +40,12 @@ findlifc(uchar *ip)
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Ipifc *ifc;
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Iplifc *lifc;
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for(ifc = ipifcs; ifc; ifc = ifc->next){
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for(ifc = ipifcs; ifc != nil; ifc = ifc->next){
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for(lifc = ifc->lifc; lifc != nil; lifc = lifc->next){
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if(lifc->net[0] == 0)
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continue;
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maskip(ip, lifc->mask, x);
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if(memcmp(x, lifc->net, IPaddrlen) == 0)
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if(ipcmp(x, lifc->net) == 0)
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return lifc;
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}
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}
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@ -58,9 +58,9 @@ forme(uchar *ip)
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Ipifc *ifc;
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Iplifc *lifc;
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for(ifc = ipifcs; ifc; ifc = ifc->next){
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for(ifc = ipifcs; ifc != nil; ifc = ifc->next){
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for(lifc = ifc->lifc; lifc != nil; lifc = lifc->next)
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if(memcmp(ip, lifc->ip, IPaddrlen) == 0)
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if(ipcmp(ip, lifc->ip) == 0)
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return 1;
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}
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return 0;
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@ -157,32 +157,32 @@ lookupip(uchar *ipaddr, Info *iip, int gate)
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else
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if(strcmp(nt->attr, "dhcp") == 0){
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if(iip->dhcpgroup[0] == 0)
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strcpy(iip->dhcpgroup, nt->val);
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strncpy(iip->dhcpgroup, nt->val, sizeof(iip->dhcpgroup)-1);
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}
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else
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if(strcmp(nt->attr, "bootf") == 0){
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if(iip->bootf[0] == 0)
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strcpy(iip->bootf, nt->val);
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strncpy(iip->bootf, nt->val, sizeof(iip->bootf)-1);
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}
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else
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if(strcmp(nt->attr, "bootf2") == 0){
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if(iip->bootf2[0] == 0)
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strcpy(iip->bootf2, nt->val);
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strncpy(iip->bootf2, nt->val, sizeof(iip->bootf2)-1);
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}
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else
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if(strcmp(nt->attr, "vendor") == 0){
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if(iip->vendor[0] == 0)
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strcpy(iip->vendor, nt->val);
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strncpy(iip->vendor, nt->val, sizeof(iip->vendor)-1);
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}
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else
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if(strcmp(nt->attr, "dom") == 0){
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if(iip->domain[0] == 0)
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strcpy(iip->domain, nt->val);
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strncpy(iip->domain, nt->val, sizeof(iip->domain)-1);
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}
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else
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if(strcmp(nt->attr, "rootpath") == 0){
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if(iip->rootpath[0] == 0)
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strcpy(iip->rootpath, nt->val);
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strncpy(iip->rootpath, nt->val, sizeof(iip->rootpath)-1);
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}
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}
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ndbfree(t);
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@ -256,11 +256,14 @@ lookup(Bootp *bp, Info *iip, Info *riip)
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* same net as riip
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*/
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t = ndbsearch(db, &s, hwattr, hwval);
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while(t){
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for(nt = t; nt; nt = nt->entry){
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while(t != nil){
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for(nt = t; nt != nil; nt = nt->entry){
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if(strcmp(nt->attr, "ip") != 0)
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continue;
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parseip(ciaddr, nt->val);
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if(parseip(ciaddr, nt->val) == -1)
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continue;
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if(!validip(ciaddr))
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continue;
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if(lookupip(ciaddr, iip, 0) < 0)
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continue;
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if(samenet(riip->ipaddr, iip)){
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@ -280,9 +283,9 @@ lookup(Bootp *bp, Info *iip, Info *riip)
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Ndbtuple*
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lookupinfo(uchar *ipaddr, char **attr, int n)
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{
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char ip[32];
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char ip[64];
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sprint(ip, "%I", ipaddr);
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snprint(ip, sizeof ip, "%I", ipaddr);
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return ndbipinfo(db, "ip", ip, attr, n);
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}
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@ -290,16 +293,18 @@ lookupinfo(uchar *ipaddr, char **attr, int n)
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* return the ip addresses for a type of server for system ip
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*/
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int
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lookupserver(char *attr, uchar **ipaddrs, Ndbtuple *t)
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lookupserver(char *attr, uchar **ipaddrs, int naddrs, Ndbtuple *t)
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{
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Ndbtuple *nt;
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int rv = 0;
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for(nt = t; rv < 2 && nt != nil; nt = nt->entry)
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if(strcmp(nt->attr, attr) == 0){
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parseip(ipaddrs[rv], nt->val);
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rv++;
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}
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for(nt = t; rv < naddrs && nt != nil; nt = nt->entry){
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if(strcmp(nt->attr, attr) != 0)
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continue;
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if(parseip(ipaddrs[rv], nt->val) == -1)
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continue;
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rv++;
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}
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return rv;
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}
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@ -307,13 +312,14 @@ lookupserver(char *attr, uchar **ipaddrs, Ndbtuple *t)
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* just lookup the name
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*/
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void
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lookupname(char *val, Ndbtuple *t)
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lookupname(char *val, int len, Ndbtuple *t)
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{
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Ndbtuple *nt;
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for(nt = t; nt != nil; nt = nt->entry)
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if(strcmp(nt->attr, "dom") == 0){
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strcpy(val, nt->val);
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strncpy(val, nt->val, len-1);
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val[len-1] = 0;
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break;
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}
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}
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