cache: reduce allocation of cache records to one chunk of memory, using calloc_a

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/cache.c b/cache.c
index 07a08575aa3639c819eb605f760017a6180b571b..fcc1620f134d59ebc5a667ce8c3a3d36c3c48df3 100644 (file)
--- a/cache.c
+++ b/cache.c
@@ -52,12 +52,6 @@ cache_record_free(struct cache_record *r, int rem)
        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);
        free(r);
 }
 
@@ -253,6 +247,8 @@ cache_answer(struct uloop_fd *u, uint8_t *base, int blen, char *name, struct dns
        struct cache_record *r;
        int port = 0, dlen = 0, tlen = 0, nlen, rdlength;
        char *p = NULL;
+       char *name_buf;
+       void *rdata_ptr, *txt_ptr;
 
        if (!(a->class & CLASS_IN))
                return;
@@ -343,32 +339,26 @@ 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);
 }