ndb/dns: handle txt rr strings as binary, remove nullrr ndb code
txt and caa rr strings might contain binary control characters such as newlines and double quotes which mess up the output in ndb(6) format. so handle them as binary blobs internally and escape special characters as \DDD where D is a octal digit when printing. txtrr() will unescape them when reading into internal binary representation. remove the undocumented nullrr ndb attribute parsing code.
This commit is contained in:
cinap_lenrek
parent
2899b719ae
commit
5de1f3d9cf
5 changed files with 106 additions and 127 deletions
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@ -26,7 +26,7 @@ struct Dict
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#define NAME(x) p = pname(p, ep, x, dp)
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#define LABEL(x) p = pname(p, ep, x, nil)
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#define SYMBOL(x) p = psym(p, ep, x)
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#define STRING(x) p = pstr(p, ep, x)
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#define STRING(x, n) p = pstr(p, ep, x, n)
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#define BYTES(x, n) p = pbytes(p, ep, x, n)
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#define USHORT(x) p = pushort(p, ep, x)
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#define UCHAR(x) p = puchar(p, ep, x)
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@ -35,24 +35,21 @@ struct Dict
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#define V6ADDR(x) p = pv6addr(p, ep, x)
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static uchar*
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psym(uchar *p, uchar *ep, char *np)
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pstr(uchar *p, uchar *ep, uchar *s, int n)
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{
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int n;
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n = strlen(np);
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if(n >= Strlen) /* DNS maximum length string */
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n = Strlen - 1;
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n = Strlen-1;
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if(ep - p < n+1) /* see if it fits in the buffer */
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return ep+1;
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*p++ = n;
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memmove(p, np, n);
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memmove(p, s, n);
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return p + n;
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}
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static uchar*
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pstr(uchar *p, uchar *ep, char *np)
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psym(uchar *p, uchar *ep, char *np)
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{
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return psym(p, ep, np);
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return pstr(p, ep, (uchar*)np, strlen(np));
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}
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static uchar*
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@ -266,7 +263,7 @@ convRR2M(RR *rp, uchar *p, uchar *ep, Dict *dp)
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break;
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case Ttxt:
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for(t = rp->txt; t != nil; t = t->next)
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STRING(t->p);
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STRING(t->data, t->dlen);
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break;
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case Tnull:
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BYTES(rp->null->data, rp->null->dlen);
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@ -103,7 +103,7 @@ gv4addr(RR *rp, Scan *sp)
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char addr[32];
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if(sp->err)
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return 0;
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return nil;
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if(sp->ep - sp->p < 4)
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return (DN*)errtoolong(rp, sp, sp->ep - sp->p, 4, "gv4addr");
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snprint(addr, sizeof addr, "%V", sp->p);
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@ -117,7 +117,7 @@ gv6addr(RR *rp, Scan *sp)
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char addr[64];
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if(sp->err)
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return 0;
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return nil;
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if(sp->ep - sp->p < IPaddrlen)
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return (DN*)errtoolong(rp, sp, sp->ep - sp->p, IPaddrlen,
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"gv6addr");
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@ -133,20 +133,20 @@ gv6addr(RR *rp, Scan *sp)
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static DN*
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gsym(RR *rp, Scan *sp)
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{
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char sym[Strlen];
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int n;
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char sym[Strlen+1];
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if(sp->err)
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return 0;
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return nil;
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n = 0;
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if (sp->p < sp->ep)
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n = *(sp->p++);
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if(sp->ep - sp->p < n)
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return (DN*)errtoolong(rp, sp, sp->ep - sp->p, n, "gsym");
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if(n > Strlen){
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if(n >= Strlen){
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sp->err = "illegal string (symbol)";
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return 0;
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return nil;
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}
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strncpy(sym, (char*)sp->p, n);
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sym[n] = 0;
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@ -164,30 +164,28 @@ static Txt*
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gstr(RR *rp, Scan *sp)
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{
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int n;
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char sym[Strlen+1];
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Txt *t;
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if(sp->err)
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return 0;
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return nil;
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n = 0;
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if (sp->p < sp->ep)
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n = *(sp->p++);
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if(sp->ep - sp->p < n)
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return (Txt*)errtoolong(rp, sp, sp->ep - sp->p, n, "gstr");
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if(n > Strlen){
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if(n >= Strlen){
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sp->err = "illegal string";
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return 0;
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return nil;
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}
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strncpy(sym, (char*)sp->p, n);
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sym[n] = 0;
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if (strlen(sym) != n)
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sp->err = "string shorter than declared length";
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sp->p += n;
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t = emalloc(sizeof(*t));
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t->next = nil;
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t->p = estrdup(sym);
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t->dlen = n;
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t->data = emalloc(n);
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memmove(t->data, sp->p, n);
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sp->p += n;
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return t;
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}
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@ -36,7 +36,6 @@ static RR* doaxfr(Ndb*, char*);
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static Ndbtuple*look(Ndbtuple*, Ndbtuple*, char*);
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static RR* mxrr(Ndbtuple*, Ndbtuple*);
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static RR* nsrr(Ndbtuple*, Ndbtuple*);
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static RR* nullrr(Ndbtuple*, Ndbtuple*);
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static RR* ptrrr(Ndbtuple*, Ndbtuple*);
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static RR* soarr(Ndbtuple*, Ndbtuple*);
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static RR* srvrr(Ndbtuple*, Ndbtuple*);
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@ -50,7 +49,6 @@ static int implemented[] =
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[Tcname] 1,
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[Tmx] 1,
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[Tns] 1,
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[Tnull] 1,
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[Tptr] 1,
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[Tsoa] 1,
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[Tsrv] 1,
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@ -228,10 +226,6 @@ dblookup1(char *name, int type, int auth, int ttl)
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attr2 = "ipv6";
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f = addr6rr;
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break;
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case Tnull:
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attr = "nullrr";
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f = nullrr;
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break;
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case Tns:
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attr = "ns";
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f = nsrr;
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@ -246,7 +240,7 @@ dblookup1(char *name, int type, int auth, int ttl)
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break;
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case Ttxt:
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attr = "txt";
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attr2 = "txtrr"; /* undocumented */
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attr2 = "txtrr"; /* obsolete */
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f = txtrr;
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break;
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case Tmx:
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@ -435,27 +429,17 @@ addrrr(Ndbtuple*, Ndbtuple *pair)
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return rp;
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}
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static RR*
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nullrr(Ndbtuple*, Ndbtuple *pair)
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{
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RR *rp;
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rp = rralloc(Tnull);
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rp->null->data = (uchar*)estrdup(pair->val);
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rp->null->dlen = strlen((char*)rp->null->data);
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return rp;
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}
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/*
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* txt rr strings are at most 255 bytes long. one
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* txt rr strings are at most Strlen-1 bytes long. one
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* can represent longer strings by multiple concatenated
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* <= 255 byte ones.
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* < Strlen byte ones.
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*/
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static RR*
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txtrr(Ndbtuple*, Ndbtuple *pair)
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{
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RR *rp;
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Txt *t, **l;
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int i, len, sofar;
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int i, n, len, sofar;
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rp = rralloc(Ttxt);
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l = &rp->txt;
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@ -466,14 +450,26 @@ txtrr(Ndbtuple*, Ndbtuple *pair)
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t = emalloc(sizeof(*t));
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t->next = nil;
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i = len-sofar;
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if(i > 255)
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i = 255;
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n = len-sofar;
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if(n >= Strlen)
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n = Strlen-1;
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t->data = emalloc(n);
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t->p = emalloc(i+1);
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memmove(t->p, pair->val+sofar, i);
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t->p[i] = 0;
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sofar += i;
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/* see bslashfmt() */
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for(i = 0; i < n && sofar < len; i++){
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uint c = pair->val[sofar++];
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if(c == '\\' && sofar < len){
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if(pair->val[sofar] >= '0' && pair->val[sofar] <= '7'){
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c = pair->val[sofar++] - '0';
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while(pair->val[sofar] >= '0' && pair->val[sofar] <= '7')
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c = (c << 3) | (pair->val[sofar++] - '0');
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} else {
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c = pair->val[sofar++];
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}
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}
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t->data[i] = c;
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}
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t->dlen = i;
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*l = t;
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l = &t->next;
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@ -672,9 +668,7 @@ dbpair2cache(DN *dp, Ndbtuple *entry, Ndbtuple *pair)
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rp = srvrr(entry, pair);
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else if(strcmp(pair->attr, "cname") == 0)
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rp = cnamerr(entry, pair);
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else if(strcmp(pair->attr, "nullrr") == 0)
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rp = nullrr(entry, pair);
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else if(strcmp(pair->attr, "txtrr") == 0) /* undocumented */
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else if(strcmp(pair->attr, "txtrr") == 0) /* obsolete */
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rp = txtrr(entry, pair);
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else if(strcmp(pair->attr, "txt") == 0)
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rp = txtrr(entry, pair);
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@ -139,7 +139,6 @@ Lock dnlock;
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static ulong agefreq = Defagefreq;
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static int rrequiv(RR *r1, RR *r2);
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static int sencodefmt(Fmt*);
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static void
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ding(void*, char *msg)
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@ -157,9 +156,10 @@ dninit(void)
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fmtinstall('E', eipfmt);
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fmtinstall('I', eipfmt);
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fmtinstall('V', eipfmt);
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fmtinstall('\\', bslashfmt);
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fmtinstall('R', rrfmt);
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fmtinstall('Q', rravfmt);
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fmtinstall('H', sencodefmt);
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fmtinstall('H', encodefmt);
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dnvars.oldest = maxage;
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dnvars.names = 0;
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@ -944,7 +944,9 @@ rrcopy(RR *rp, RR **last)
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*l = nil;
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for(t = rp->txt; t != nil; t = t->next){
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nt = emalloc(sizeof(*nt));
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nt->p = estrdup(t->p);
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nt->dlen = t->dlen;
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nt->data = emalloc(t->dlen);
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memmove(nt->data, t->data, t->dlen);
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nt->next = nil;
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*l = nt;
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l = &nt->next;
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@ -1194,6 +1196,47 @@ idnname(DN *dn, char *buf, int nbuf)
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return name;
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}
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/*
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* txt rr strings can contain binary data such as
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* control characters and double quotes (") which would
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* collide with ndb(6) format.
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* escape special characters by encoding them as: \DDD
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* where D is a octal digit. backslash (\) is escaped
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* by doubling. valid utf8 is encoded verbatim.
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*/
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int
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bslashfmt(Fmt *f)
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{
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int len, out, n, c;
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uchar *data;
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out = 0;
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len = f->prec;
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f->prec = 0;
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f->flags &= ~FmtPrec;
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data = va_arg(f->args, uchar*);
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for(; len > 0; data += n, len -= n){
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if(*data >= Runeself && fullrune((char*)data, len)){
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Rune r;
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n = chartorune(&r, (char*)data);
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if(r != Runeerror){
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out += fmtprint(f, "%C", r);
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continue;
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}
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}
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c = *data;
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if(c < ' ' || c == '"' || c > '~')
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out += fmtprint(f, "\\%.3o", c);
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else if(c == '\\')
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out += fmtprint(f, "\\\\");
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else
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out += fmtprint(f, "%c", c);
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n = 1;
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}
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return out;
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}
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/*
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* print conversion for rr records
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*/
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@ -1280,7 +1323,7 @@ rrfmt(Fmt *f)
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case Ttxt:
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fmtprint(&fstr, "\t");
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for(t = rp->txt; t != nil; t = t->next)
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fmtprint(&fstr, "%s", t->p);
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fmtprint(&fstr, "%.*\\", t->dlen, t->data);
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break;
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case Trp:
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fmtprint(&fstr, "\t%s %s", dnname(rp->rmb), dnname(rp->rp));
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@ -1314,9 +1357,9 @@ rrfmt(Fmt *f)
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if (rp->caa == nil)
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fmtprint(&fstr, "\t<null> <null> <null>");
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else
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fmtprint(&fstr, "\t%d %s %.*s",
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fmtprint(&fstr, "\t%d %s %.*\\",
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rp->caa->flags, dnname(rp->caa->tag),
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rp->caa->dlen, (char*)rp->caa->data);
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rp->caa->dlen, rp->caa->data);
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break;
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}
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out:
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@ -1416,7 +1459,7 @@ rravfmt(Fmt *f)
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case Ttxt:
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fmtprint(&fstr, " txt=\"");
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for(t = rp->txt; t != nil; t = t->next)
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fmtprint(&fstr, "%s", t->p);
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fmtprint(&fstr, "%.*\\", t->dlen, t->data);
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fmtprint(&fstr, "\"");
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break;
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case Trp:
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@ -1453,9 +1496,9 @@ rravfmt(Fmt *f)
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if (rp->caa == nil)
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fmtprint(&fstr, " flags=<null> tag=<null> caa=<null>");
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else
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fmtprint(&fstr, " flags=%d tag=%s caa=\"%.*s\"",
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fmtprint(&fstr, " flags=%d tag=%s caa=\"%.*\\\"",
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rp->caa->flags, dnname(rp->caa->tag),
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rp->caa->dlen, (char*)rp->caa->data);
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rp->caa->dlen, rp->caa->data);
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break;
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}
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out:
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@ -1574,14 +1617,14 @@ certequiv(Cert *a, Cert *b)
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static int
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txtequiv(Txt *a, Txt *b)
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{
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char *ap, *ae, *bp, *be;
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uchar *ap, *ae, *bp, *be;
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int n;
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for(ap = ae = bp = be = nil;;ap += n, bp += n){
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while(a != nil && (ap == nil || (ap == ae && (a = a->next) != nil)))
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ap = a->p, ae = ap + strlen(ap);
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while(b != nil && (bp == nil || (bp == be && (b = b->next) != nil)))
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bp = b->p, be = bp + strlen(bp);
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while(a != nil && (ap == nil || (ap >= ae && (a = a->next) != nil)))
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ap = a->data, ae = ap + a->dlen;
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while(b != nil && (bp == nil || (bp >= be && (b = b->next) != nil)))
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bp = b->data, be = bp + b->dlen;
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if(a == b || a == nil || b == nil)
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break;
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n = ae - ap;
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@ -1709,61 +1752,6 @@ randomize(RR *rp)
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return first;
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}
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static int
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sencodefmt(Fmt *f)
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{
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int i, len, ilen, rv;
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char *out, *buf;
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uchar *b;
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char obuf[64]; /* rsc optimization */
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if(!(f->flags&FmtPrec) || f->prec < 1)
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goto error;
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b = va_arg(f->args, uchar*);
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if(b == nil)
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goto error;
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/* if it's a printable, go for it */
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len = f->prec;
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for(i = 0; i < len; i++)
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if(!isprint(b[i]))
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break;
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if(i == len){
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if(len >= sizeof obuf)
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len = sizeof(obuf)-1;
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memmove(obuf, b, len);
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obuf[len] = 0;
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fmtstrcpy(f, obuf);
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return 0;
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}
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ilen = f->prec;
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f->prec = 0;
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f->flags &= ~FmtPrec;
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len = 2*ilen + 1;
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if(len > sizeof(obuf)){
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buf = malloc(len);
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if(buf == nil)
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goto error;
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} else
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buf = obuf;
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/* convert */
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out = buf;
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rv = enc16(out, len, b, ilen);
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if(rv < 0)
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goto error;
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fmtstrcpy(f, buf);
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if(buf != obuf)
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free(buf);
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return 0;
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error:
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return fmtstrcpy(f, "<encodefmt>");
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}
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void*
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emalloc(int size)
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{
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|
|
@ -2048,7 +2036,7 @@ rrfree(RR *rp)
|
|||
case Ttxt:
|
||||
while(t = rp->txt){
|
||||
rp->txt = t->next;
|
||||
free(t->p);
|
||||
free(t->data);
|
||||
memset(t, 0, sizeof *t); /* cause trouble */
|
||||
free(t);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -251,7 +251,7 @@ struct Null
|
|||
struct Txt
|
||||
{
|
||||
Txt *next;
|
||||
char *p;
|
||||
Block;
|
||||
};
|
||||
|
||||
/*
|
||||
|
|
@ -436,6 +436,7 @@ extern char *trace;
|
|||
extern int traceactivity;
|
||||
extern char *zonerefreshprogram;
|
||||
|
||||
#pragma varargck type "\\" uchar*
|
||||
#pragma varargck type "R" RR*
|
||||
#pragma varargck type "Q" RR*
|
||||
|
||||
|
|
@ -448,6 +449,7 @@ extern Lock dnlock;
|
|||
|
||||
void abort(); /* char*, ... */;
|
||||
void addserver(Server**, char*);
|
||||
int bslashfmt(Fmt*);
|
||||
Server* copyserverlist(Server*);
|
||||
void db2cache(int);
|
||||
void dnage(DN*);
|
||||
|
|
|
|||
Loading…
Reference in a new issue