interface: include libubox/utils.h
[project/mdnsd.git] / cache.c
diff --git a/cache.c b/cache.c
index 2658bd6..07d4f20 100644 (file)
--- a/cache.c
+++ b/cache.c
@@ -24,7 +24,6 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
-#include <asm/byteorder.h>
 #include <arpa/nameser.h>
 #include <resolv.h>
 #include <time.h>
@@ -42,7 +41,8 @@
 #include "interface.h"
 
 static struct uloop_timeout cache_gc;
-struct avl_tree records, entries;
+struct avl_tree services;
+static AVL_TREE(records, avl_strcmp, true, NULL);
 
 static void
 cache_record_free(struct cache_record *r)
@@ -53,17 +53,17 @@ cache_record_free(struct cache_record *r)
 }
 
 static void
-cache_entry_free(struct cache_entry *s)
+cache_service_free(struct cache_service *s)
 {
        DBG(2, "%s\n", s->entry);
-       avl_delete(&entries, &s->avl);
+       avl_delete(&services, &s->avl);
        free(s);
 }
 
 static int
-cache_is_expired(time_t t, uint32_t ttl)
+cache_is_expired(time_t t, uint32_t ttl, int frac)
 {
-       if (time(NULL) - t >= ttl)
+       if (monotonic_time() - t >= ttl * frac / 100)
                return 1;
 
        return 0;
@@ -73,17 +73,23 @@ static void
 cache_gc_timer(struct uloop_timeout *timeout)
 {
        struct cache_record *r, *p;
-       struct cache_entry *s, *t;
+       struct cache_service *s, *t;
 
        avl_for_each_element_safe(&records, r, avl, p)
-               if (cache_is_expired(r->time, r->ttl))
+               if (cache_is_expired(r->time, r->ttl, 100))
                        cache_record_free(r);
 
-       avl_for_each_element_safe(&entries, s, avl, t) {
+       avl_for_each_element_safe(&services, s, avl, t) {
                if (!s->host)
                        continue;
-               if (cache_is_expired(s->time, s->ttl))
-                       cache_entry_free(s);
+               if (!cache_is_expired(s->time, s->ttl, s->refresh))
+                       continue;
+               if (s->refresh >= 100) {
+                       cache_service_free(s);
+                       continue;
+               }
+               s->refresh += 50;
+               dns_send_question(s->iface, s->entry, TYPE_PTR, 1);
        }
 
        uloop_timeout_set(timeout, 10000);
@@ -92,8 +98,7 @@ cache_gc_timer(struct uloop_timeout *timeout)
 int
 cache_init(void)
 {
-       avl_init(&entries, avl_strcmp, true, NULL);
-       avl_init(&records, avl_strcmp, true, NULL);
+       avl_init(&services, avl_strcmp, true, NULL);
 
        cache_gc.cb = cache_gc_timer;
        uloop_timeout_set(&cache_gc, 10000);
@@ -101,48 +106,55 @@ cache_init(void)
        return 0;
 }
 
-void cache_cleanup(void)
+void cache_cleanup(struct interface *iface)
 {
        struct cache_record *r, *p;
-       struct cache_entry *s, *t;
+       struct cache_service *s, *t;
 
-       avl_for_each_element_safe(&records, r, avl, p)
-               cache_record_free(r);
+       avl_for_each_element_safe(&services, s, avl, t)
+               if (!iface || iface == s->iface)
+                       cache_service_free(s);
 
-       avl_for_each_element_safe(&entries, s, avl, t)
-               cache_entry_free(s);
+       avl_for_each_element_safe(&records, r, avl, p)
+               if (!iface || iface == r->iface)
+                       cache_record_free(r);
 }
 
 void
 cache_scan(void)
 {
        struct interface *iface;
-       struct cache_entry *s;
+       struct cache_service *s;
 
        vlist_for_each_element(&interfaces, iface, node)
-               avl_for_each_element(&entries, s, avl)
-                       dns_send_question(iface, s->entry, TYPE_PTR);
+               avl_for_each_element(&services, s, avl)
+                       dns_send_question(iface, s->entry, TYPE_PTR, 1);
 }
 
-static struct cache_entry*
-cache_entry(struct interface *iface, char *entry, int hlen, int ttl)
+static struct cache_service*
+cache_service(struct interface *iface, char *entry, int hlen, int ttl)
 {
-       struct cache_entry *s;
+       struct cache_service *s, *t;
        char *entry_buf;
        char *host_buf;
        char *type;
 
-       s = avl_find_element(&entries, entry, s, avl);
-       if (s)
-               return s;
+       avl_for_each_element_safe(&services, s, avl, t)
+               if (!strcmp(s->entry, entry)) {
+                       s->refresh = 50;
+                       s->time = monotonic_time();
+                       return s;
+               }
 
        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->time = monotonic_time();
        s->ttl = ttl;
+       s->iface = iface;
+       s->refresh = 50;
 
        if (hlen)
                s->host = strncpy(host_buf, s->entry, hlen);
@@ -152,10 +164,10 @@ cache_entry(struct interface *iface, char *entry, int hlen, int ttl)
                type++;
        if (type)
                s->avl.key = type;
-       avl_insert(&entries, &s->avl);
+       avl_insert(&services, &s->avl);
 
        if (!hlen)
-               dns_send_question(iface, entry, TYPE_PTR);
+               dns_send_question(iface, entry, TYPE_PTR, !iface->multicast);
 
        return s;
 }
@@ -168,7 +180,7 @@ cache_record_find(char *record, int type, int port, int rdlength, uint8_t *rdata
        if (!l)
                return NULL;
 
-       while (l && !avl_is_last(&records, &l->avl) && !strcmp(l->record, record)) {
+       while (l && l->record && !strcmp(l->record, record)) {
                struct cache_record *r = l;
 
                l = avl_next_element(l, avl);
@@ -217,7 +229,7 @@ cache_host_is_known(char *record)
 }
 
 void
-cache_answer(struct interface *iface, 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, int flush)
 {
        struct dns_srv_data *dsd = (struct dns_srv_data *) rdata;
        struct cache_record *r;
@@ -226,11 +238,8 @@ cache_answer(struct interface *iface, uint8_t *base, int blen, char *name, struc
        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;
+       static char *rdata_buffer = (char *) mdns_buf;
+       time_t now = monotonic_time();
 
        nlen = strlen(name);
 
@@ -244,7 +253,7 @@ cache_answer(struct interface *iface, uint8_t *base, int blen, char *name, struc
                        return;
                }
 
-               DBG(1, "A -> %s %s %s\n", dns_type_string(a->type), name, rdata_buffer);
+               DBG(1, "A -> %s %s %s ttl:%d\n", dns_type_string(a->type), name, rdata_buffer, a->ttl);
 
                rdlength = strlen(rdata_buffer);
 
@@ -252,14 +261,25 @@ cache_answer(struct interface *iface, uint8_t *base, int blen, char *name, struc
                    nlen + 1 < rdlength && !strcmp(rdata_buffer + rdlength - nlen, name))
                        host_len = rdlength - nlen - 1;
 
-               cache_entry(iface, rdata_buffer, host_len, a->ttl);
-               return;
+               cache_service(iface, rdata_buffer, host_len, a->ttl);
+
+               dlen = strlen(rdata_buffer) + 1;
+               rdata = (uint8_t*)rdata_buffer;
+               break;
 
        case TYPE_SRV:
                if (a->rdlength < 8)
                        return;
 
                port = be16_to_cpu(dsd->port);
+               memcpy(rdata_buffer, dsd, sizeof(*dsd));
+               if (dn_expand(base, base + blen, (const uint8_t*)&dsd[1],
+                               &rdata_buffer[sizeof(*dsd)], MAX_DATA_LEN - sizeof(*dsd)) < 0) {
+                       perror("process_answer/dn_expand");
+                       return;
+               }
+               dlen = sizeof(*dsd) + strlen(&rdata_buffer[sizeof(*dsd)]) + 1;
+               rdata = (uint8_t*)rdata_buffer;
                break;
 
        case TYPE_TXT:
@@ -276,20 +296,20 @@ cache_answer(struct interface *iface, uint8_t *base, int blen, char *name, struc
                        uint8_t v = *p;
 
                        *p = '\0';
-                       if (v)
+                       if (v && p + v < &rdata_buffer[rdlength])
                                p += v + 1;
                } while (*p);
                break;
 
        case TYPE_A:
-               cache_entry(iface, name, strlen(name), a->ttl);
+               cache_service(iface, name, strlen(name), a->ttl);
                if (a->rdlength != 4)
                        return;
                dlen = 4;
                break;
 
        case TYPE_AAAA:
-               cache_entry(iface, name, strlen(name), a->ttl);
+               cache_service(iface, name, strlen(name), a->ttl);
                if (a->rdlength != 16)
                        return;
                dlen = 16;
@@ -302,10 +322,11 @@ cache_answer(struct interface *iface, uint8_t *base, int blen, char *name, struc
        r = cache_record_find(name, a->type, port, dlen, rdata);
        if (r) {
                if (!a->ttl) {
-                       cache_record_free(r);
                        DBG(1, "D -> %s %s ttl:%d\n", dns_type_string(r->type), r->record, r->ttl);
+                       r->time = now + 1 - r->ttl;
                } else {
                        r->ttl = a->ttl;
+                       r->time = now;
                        DBG(1, "A -> %s %s ttl:%d\n", dns_type_string(r->type), r->record, r->ttl);
                }
                return;
@@ -324,7 +345,8 @@ cache_answer(struct interface *iface, uint8_t *base, int blen, char *name, struc
        r->ttl = a->ttl;
        r->port = port;
        r->rdlength = dlen;
-       r->time = time(NULL);
+       r->time = now;
+       r->iface = iface;
 
        if (tlen)
                r->txt = memcpy(txt_ptr, rdata_buffer, tlen);
@@ -341,15 +363,12 @@ cache_answer(struct interface *iface, uint8_t *base, int blen, char *name, struc
 void
 cache_dump_records(struct blob_buf *buf, const char *name)
 {
-       struct cache_record *r, *q = avl_find_element(&records, name, r, avl);
+       struct cache_record *r, *last, *next;
        const char *txt;
-       char buffer[MAX_NAME_LEN];
-
-       if (!q)
-               return;
+       char buffer[INET6_ADDRSTRLEN];
 
-       do {
-               r = q;
+       last = avl_last_element(&records, last, avl);
+       for (r = avl_find_element(&records, name, r, avl); r; r = next) {
                switch (r->type) {
                case TYPE_TXT:
                        if (r->txt && strlen(r->txt)) {
@@ -376,6 +395,85 @@ cache_dump_records(struct blob_buf *buf, const char *name)
                                blobmsg_add_string(buf, "ipv6", buffer);
                        break;
                }
-               q = avl_next_element(r, avl);
-       } while (q && !strcmp(r->record, q->record));
+
+               if (r == last)
+                       break;
+
+               next = avl_next_element(r, avl);
+               if (strcmp(r->record, next->record) != 0)
+                       break;
+       }
+}
+
+void
+cache_dump_recursive(struct blob_buf *b, const char *name, uint16_t type, struct interface *iface)
+{
+       time_t now = monotonic_time();
+       for (struct cache_record *r = avl_find_ge_element(&records, name, r, avl);
+                       r && !strcmp(r->record, name);
+                       r = !avl_is_last(&records, &r->avl) ? avl_next_element(r, avl) : NULL) {
+               int32_t ttl = r->ttl - (now - r->time);
+               if (ttl <= 0 || (iface && iface->ifindex != r->iface->ifindex) ||
+                               (type != TYPE_ANY && type != r->type))
+                       continue;
+
+               const char *txt;
+               char buf[INET6_ADDRSTRLEN];
+               void *k = blobmsg_open_table(b, NULL), *l;
+               const struct dns_srv_data *dsd = (const struct dns_srv_data*)r->rdata;
+
+               blobmsg_add_string(b, "name", r->record);
+               blobmsg_add_string(b, "type", dns_type_string(r->type));
+               blobmsg_add_u32(b, "ttl", ttl);
+
+               switch (r->type) {
+               case TYPE_TXT:
+                       if ((txt = r->txt) && strlen(txt)) {
+                               l = blobmsg_open_array(b, "data");
+                               do {
+                                       blobmsg_add_string(b, NULL, txt);
+                                       txt = &txt[strlen(txt) + 1];
+                               } while (*txt);
+                               blobmsg_close_array(b, l);
+                       }
+                       break;
+
+               case TYPE_SRV:
+                       if (r->rdlength > sizeof(*dsd)) {
+                               blobmsg_add_u32(b, "priority", be16_to_cpu(dsd->priority));
+                               blobmsg_add_u32(b, "weight", be16_to_cpu(dsd->weight));
+                               blobmsg_add_u32(b, "port", be16_to_cpu(dsd->port));
+                               blobmsg_add_string(b, "target", (const char*)&dsd[1]);
+                       }
+                       break;
+
+               case TYPE_PTR:
+                       if (r->rdlength > 0)
+                               blobmsg_add_string(b, "target", (const char*)r->rdata);
+                       break;
+
+               case TYPE_A:
+                       if ((r->rdlength == 4) && inet_ntop(AF_INET, r->rdata, buf, sizeof(buf)))
+                               blobmsg_add_string(b, "target", buf);
+                       break;
+
+               case TYPE_AAAA:
+                       if ((r->rdlength == 16) && inet_ntop(AF_INET6, r->rdata, buf, sizeof(buf)))
+                               blobmsg_add_string(b, "target", buf);
+                       break;
+               }
+
+               blobmsg_close_table(b, k);
+
+
+               if (r->type == TYPE_PTR) {
+                       cache_dump_recursive(b, (const char*)r->rdata, TYPE_SRV, iface);
+                       cache_dump_recursive(b, (const char*)r->rdata, TYPE_TXT, iface);
+               }
+
+               if (r->type == TYPE_SRV) {
+                       cache_dump_recursive(b, (const char*)&dsd[1], TYPE_A, iface);
+                       cache_dump_recursive(b, (const char*)&dsd[1], TYPE_AAAA, iface);
+               }
+       }
 }