chiark / gitweb /
slip: Report unexpected kinds of death from userv
[secnet.git] / resolver.c
index f60b112..a39e9fc 100644 (file)
@@ -2,10 +2,13 @@
 
 #include <errno.h>
 #include "secnet.h"
+#include "util.h"
 #ifndef HAVE_LIBADNS
 #error secnet requires ADNS version 1.0 or above
 #endif
 #include <adns.h>
+#include <arpa/inet.h>
+#include <string.h>
 
 
 struct adns {
@@ -17,25 +20,78 @@ struct adns {
 
 struct query {
     void *cst;
+    const char *name;
+    int port;
+    struct comm_if *comm;
     resolve_answer_fn *answer;
     adns_query query;
 };
 
 static resolve_request_fn resolve_request;
 static bool_t resolve_request(void *sst, cstring_t name,
+                             int port, struct comm_if *comm,
                              resolve_answer_fn *cb, void *cst)
 {
     struct adns *st=sst;
     struct query *q;
     int rv;
+    const int maxlitlen=
+#ifdef CONFIG_IPV6
+       ADNS_ADDR2TEXT_BUFLEN*2
+#else
+       50
+#endif
+       ;
+    ssize_t l=strlen(name);
+    if (name[0]=='[' && l<maxlitlen && l>2 && name[l-1]==']') {
+       char trimmed[maxlitlen+1];
+       memcpy(trimmed,name+1,l-2);
+       trimmed[l-2]=0;
+       struct comm_addr ca;
+       ca.comm=comm;
+       ca.ix=-1;
+#ifdef CONFIG_IPV6
+       socklen_t salen=sizeof(ca.ia);
+       rv=adns_text2addr(trimmed, port, adns_qf_addrlit_ipv4_quadonly,
+                         &ca.ia.sa, &salen);
+       assert(rv!=ENOSPC);
+       if (rv) {
+           char msg[250];
+           snprintf(msg,sizeof(msg),"invalid address literal: %s",
+                    strerror(rv));
+           msg[sizeof(msg)-1]=0;
+           cb(cst,0,0,0,name,msg);
+       } else {
+           cb(cst,&ca,1,1,name,0);
+       }
+#else
+       ca.ia.sin.sin_family=AF_INET;
+       ca.ia.sin.sin_port=htons(port);
+       if (inet_aton(trimmed,&ca.ia.sin.sin_addr))
+           cb(cst,&ca,1,1,name,0);
+       else
+           cb(cst,0,0,0,name,"invalid IP address");
+#endif
+       return True;
+    }
 
     q=safe_malloc(sizeof *q,"resolve_request");
     q->cst=cst;
+    q->comm=comm;
+    q->port=port;
+    q->name=name;
     q->answer=cb;
 
-    rv=adns_submit(st->ast, name, adns_r_a, 0, q, &q->query);
+    rv=adns_submit(st->ast, name, adns_r_addr, 0, q, &q->query);
+    if (rv) {
+        Message(M_WARNING,
+               "resolver: failed to submit lookup for %s: %s",name,
+               adns_strerror(rv));
+       free(q);
+       return False;
+    }
 
-    return rv==0;
+    return True;
 }
 
 static int resolver_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
@@ -62,11 +118,39 @@ static void resolver_afterpoll(void *sst, struct pollfd *fds, int nfds)
        if (rv==0) {
            q=qp;
            if (ans->status!=adns_s_ok) {
-               q->answer(q->cst,NULL); /* Failure */
+               q->answer(q->cst,NULL,0,0,q->name,adns_strerror(ans->status));
                free(q);
                free(ans);
            } else {
-               q->answer(q->cst,ans->rrs.inaddr);
+               int rslot, wslot, total;
+               int ca_len=MIN(ans->nrrs,MAX_PEER_ADDRS);
+               struct comm_addr ca_buf[ca_len];
+               for (rslot=0, wslot=0, total=0;
+                    rslot<ans->nrrs;
+                    rslot++) {
+                   total++;
+                   if (!(wslot<ca_len)) continue;
+                   adns_rr_addr *ra=&ans->rrs.addr[rslot];
+                   struct comm_addr *ca=&ca_buf[wslot];
+                   ca->comm=q->comm;
+                   ca->ix=-1;
+                   switch (ra->addr.sa.sa_family) {
+                   case AF_INET:
+                       assert(ra->len == sizeof(ca->ia.sin));
+                       break;
+#ifdef CONFIG_IPV6
+                   case AF_INET6:
+                       assert(ra->len == sizeof(ca->ia.sin6));
+                       break;
+#endif /*CONFIG_IPV6*/
+                   default:
+                       /* silently skip unexpected AFs from adns */
+                       continue;
+                   }
+                   memcpy(&ca->ia,&ra->addr,ra->len);
+                   wslot++;
+               }
+               q->answer(q->cst,ca_buf,wslot,total,q->name,0);
                free(q);
                free(ans);
            }
@@ -116,7 +200,7 @@ static list_t *adnsresolver_apply(closure_t *self, struct cloc loc,
     }
 
     register_for_poll(st, resolver_beforepoll, resolver_afterpoll,
-                     ADNS_POLLFDS_RECOMMENDED+5,"resolver");
+                     "resolver");
 
     return new_closure(&st->cl);
 }