remove unused avl tree hosts
[project/mdnsd.git] / cache.c
diff --git a/cache.c b/cache.c
index b244dae..9addc3c 100644 (file)
--- a/cache.c
+++ b/cache.c
 #include <libubox/uloop.h>
 #include <libubox/avl-cmp.h>
 #include <libubox/blobmsg_json.h>
+#include <libubox/kvlist.h>
 #include <libubus.h>
 
 #include "cache.h"
 #include "util.h"
 #include "dns.h"
+#include "interface.h"
 
 static struct uloop_timeout cache_gc;
-struct avl_tree records, entries, types, hosts;
-static struct blob_buf b;
+struct avl_tree records, entries;
 
 static void
-cache_record_free(struct cache_record *r, int rem)
+cache_record_free(struct cache_record *r)
 {
        DBG(2, "%s %s\n", dns_type_string(r->type), r->record);
-       if (rem)
-               avl_delete(&records, &r->avl);
-       if (r->record)
-               free(r->record);
-       if (r->rdata)
-               free(r->rdata);
-       if (r->txt)
-               free(r->txt);
+       avl_delete(&records, &r->avl);
        free(r);
 }
 
@@ -63,10 +57,6 @@ cache_entry_free(struct cache_entry *s)
 {
        DBG(2, "%s\n", s->entry);
        avl_delete(&entries, &s->avl);
-       if (s->host)
-               free(s->host);
-       if (s->entry)
-               free(s->entry);
        free(s);
 }
 
@@ -87,7 +77,7 @@ cache_gc_timer(struct uloop_timeout *timeout)
 
        avl_for_each_element_safe(&records, r, avl, p)
                if (cache_is_expired(r->time, r->ttl))
-                       cache_record_free(r, 1);
+                       cache_record_free(r);
 
        avl_for_each_element_safe(&entries, s, avl, t) {
                if (!s->host)
@@ -99,50 +89,14 @@ cache_gc_timer(struct uloop_timeout *timeout)
        uloop_timeout_set(timeout, 10000);
 }
 
-static void
-cache_load_services(void)
-{
-       struct blob_attr *cur;
-        int rem;
-
-        blob_buf_init(&b, 0);
-
-       if (!blobmsg_add_json_from_file(&b, "/lib/mdns/service-types"))
-               return;
-
-       blob_for_each_attr(cur, b.head, rem) {
-               struct cache_type *t = malloc(sizeof(struct cache_type));
-
-               if (!t)
-                       continue;
-               t->avl.key = t->key = strdup(blobmsg_name(cur));
-               t->val = strdup(blobmsg_get_string(cur));
-               avl_insert(&types, &t->avl);
-       }
-}
-
-char*
-cache_lookup_name(const char *key)
-{
-       struct cache_type *t;
-
-       t = avl_find_element(&types, key, t, avl);
-       if (!t)
-               return NULL;
-
-       return t->val;
-}
-
 int
 cache_init(void)
 {
        avl_init(&entries, avl_strcmp, true, NULL);
-       avl_init(&types, avl_strcmp, false, NULL);
        avl_init(&records, avl_strcmp, true, NULL);
 
        cache_gc.cb = cache_gc_timer;
        uloop_timeout_set(&cache_gc, 10000);
-       cache_load_services();
 
        return 0;
 }
@@ -153,7 +107,7 @@ void cache_cleanup(void)
        struct cache_entry *s, *t;
 
        avl_for_each_element_safe(&records, r, avl, p)
-               cache_record_free(r, 1);
+               cache_record_free(r);
 
        avl_for_each_element_safe(&entries, s, avl, t)
                cache_entry_free(s);
@@ -162,42 +116,38 @@ void cache_cleanup(void)
 void
 cache_scan(void)
 {
+       struct interface *iface;
        struct cache_entry *s;
 
-       avl_for_each_element(&entries, s, avl)
-               dns_send_question(&listener, s->entry, TYPE_PTR);
-}
-
-static struct cache_entry*
-cache_find_entry(char *entry)
-{
-       struct cache_entry *s;
-
-       avl_for_each_element(&entries, s, avl)
-               if (!strcmp(s->entry, entry))
-                       return s;
-       return NULL;
+       vlist_for_each_element(&interfaces, iface, node)
+               avl_for_each_element(&entries, s, avl)
+                       dns_send_question(iface, s->entry, TYPE_PTR);
 }
 
 static struct cache_entry*
-cache_entry(struct uloop_fd *u, char *entry, int hlen, int ttl)
+cache_entry(struct interface *iface, char *entry, int hlen, int ttl)
 {
        struct cache_entry *s;
+       char *entry_buf;
+       char *host_buf;
        char *type;
 
-       s = cache_find_entry(entry);
+       s = avl_find_element(&entries, entry, s, avl);
        if (s)
                return s;
 
-       s = malloc(sizeof(struct cache_entry));
-       memset(s, 0, sizeof(struct cache_entry));
-       s->avl.key = s->entry = strdup(entry);
+       s = calloc_a(sizeof(*s),
+               &entry_buf, strlen(entry) + 1,
+               &host_buf, hlen ? hlen + 1 : 0);
+
+       s->avl.key = s->entry = strcpy(entry_buf, entry);
        s->time = time(NULL);
        s->ttl = ttl;
 
        if (hlen)
-               s->host = strndup(s->entry, hlen);
-       type = strstr(s->entry, "._");
+               s->host = strncpy(host_buf, s->entry, hlen);
+
+       type = strstr(entry_buf, "._");
        if (type)
                type++;
        if (type)
@@ -205,7 +155,7 @@ cache_entry(struct uloop_fd *u, char *entry, int hlen, int ttl)
        avl_insert(&entries, &s->avl);
 
        if (!hlen)
-               dns_send_question(u, entry, TYPE_PTR);
+               dns_send_question(iface, entry, TYPE_PTR);
 
        return s;
 }
@@ -267,12 +217,17 @@ cache_host_is_known(char *record)
 }
 
 void
-cache_answer(struct uloop_fd *u, uint8_t *base, int blen, char *name, struct dns_answer *a, uint8_t *rdata)
+cache_answer(struct interface *iface, uint8_t *base, int blen, char *name, struct dns_answer *a, uint8_t *rdata)
 {
        struct dns_srv_data *dsd = (struct dns_srv_data *) rdata;
        struct cache_record *r;
        int port = 0, dlen = 0, tlen = 0, nlen, rdlength;
        char *p = NULL;
+       char *name_buf;
+       void *rdata_ptr, *txt_ptr;
+       int host_len = 0;
+
+       static char rdata_buffer[MAX_DATA_LEN + 1];
 
        if (!(a->class & CLASS_IN))
                return;
@@ -293,15 +248,11 @@ cache_answer(struct uloop_fd *u, uint8_t *base, int blen, char *name, struct dns
 
                rdlength = strlen(rdata_buffer);
 
-               if (!strcmp(C_DNS_SD, name)) {
-                       cache_entry(u, rdata_buffer, 0, a->ttl);
-                       return;
-               }
+               if (strcmp(C_DNS_SD, name) != 0 &&
+                   nlen + 1 < rdlength && !strcmp(rdata_buffer + rdlength - nlen, name))
+                       host_len = rdlength - nlen - 1;
 
-               if ((rdlength < nlen) && (rdlength - nlen - 1 > 0))
-                       return;
-
-               cache_entry(u, rdata_buffer, rdlength - nlen - 1, a->ttl);
+               cache_entry(iface, rdata_buffer, host_len, a->ttl);
                return;
 
        case TYPE_SRV:
@@ -331,14 +282,14 @@ cache_answer(struct uloop_fd *u, uint8_t *base, int blen, char *name, struct dns
                break;
 
        case TYPE_A:
-               cache_entry(u, name, strlen(name), a->ttl);
+               cache_entry(iface, name, strlen(name), a->ttl);
                if (a->rdlength != 4)
                        return;
                dlen = 4;
                break;
 
        case TYPE_AAAA:
-               cache_entry(u, name, strlen(name), a->ttl);
+               cache_entry(iface, name, strlen(name), a->ttl);
                if (a->rdlength != 16)
                        return;
                dlen = 16;
@@ -351,7 +302,7 @@ cache_answer(struct uloop_fd *u, uint8_t *base, int blen, char *name, struct dns
        r = cache_record_find(name, a->type, port, dlen, rdata);
        if (r) {
                if (!a->ttl) {
-                       cache_record_free(r, 1);
+                       cache_record_free(r);
                        DBG(1, "D -> %s %s ttl:%d\n", dns_type_string(r->type), r->record, r->ttl);
                } else {
                        r->ttl = a->ttl;
@@ -363,32 +314,26 @@ cache_answer(struct uloop_fd *u, uint8_t *base, int blen, char *name, struct dns
        if (!a->ttl)
                return;
 
-       r = malloc(sizeof(struct cache_record));
-       memset(r, 0, sizeof(struct cache_record));
-       r->avl.key = r->record = strdup(name);
+       r = calloc_a(sizeof(*r),
+               &name_buf, strlen(name) + 1,
+               &txt_ptr, tlen,
+               &rdata_ptr, dlen);
+
+       r->avl.key = r->record = strcpy(name_buf, name);
        r->type = a->type;
        r->ttl = a->ttl;
        r->port = port;
        r->rdlength = dlen;
        r->time = time(NULL);
 
-       if (tlen) {
-               r->txt = malloc(tlen);
-               if (r->txt)
-                       memcpy(r->txt, rdata_buffer, tlen);
-       }
+       if (tlen)
+               r->txt = memcpy(txt_ptr, rdata_buffer, tlen);
 
-       if (dlen) {
-               r->rdata = malloc(dlen);
-               if (!r->rdata) {
-                       cache_record_free(r, 0);
-                       return;
-               }
-               memcpy(r->rdata, rdata, dlen);
-       }
+       if (dlen)
+               r->rdata = memcpy(rdata_ptr, rdata, dlen);
 
        if (avl_insert(&records, &r->avl))
-               cache_record_free(r, 0);
+               free(r);
        else
                DBG(1, "A -> %s %s ttl:%d\n", dns_type_string(r->type), r->record, r->ttl);
 }