This source file includes following definitions.
- ngx_resolver_create
- ngx_resolver_cleanup
- ngx_resolver_cleanup_tree
- ngx_resolve_start
- ngx_resolve_name
- ngx_resolve_name_done
- ngx_resolve_name_locked
- ngx_resolve_addr
- ngx_resolve_addr_done
- ngx_resolver_expire
- ngx_resolver_send_query
- ngx_resolver_resend_handler
- ngx_resolver_resend
- ngx_resolver_read_response
- ngx_resolver_process_response
- ngx_resolver_process_a
- ngx_resolver_process_ptr
- ngx_resolver_lookup_name
- ngx_resolver_lookup_addr
- ngx_resolver_lookup_addr6
- ngx_resolver_rbtree_insert_value
- ngx_resolver_rbtree_insert_addr6_value
- ngx_resolver_create_name_query
- ngx_resolver_create_addr_query
- ngx_resolver_copy
- ngx_resolver_timeout_handler
- ngx_resolver_free_node
- ngx_resolver_alloc
- ngx_resolver_calloc
- ngx_resolver_free
- ngx_resolver_free_locked
- ngx_resolver_dup
- ngx_resolver_export
- ngx_resolver_strerror
- ngx_resolver_log_error
- ngx_udp_connect
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#define NGX_RESOLVER_UDP_SIZE 4096
typedef struct {
u_char ident_hi;
u_char ident_lo;
u_char flags_hi;
u_char flags_lo;
u_char nqs_hi;
u_char nqs_lo;
u_char nan_hi;
u_char nan_lo;
u_char nns_hi;
u_char nns_lo;
u_char nar_hi;
u_char nar_lo;
} ngx_resolver_hdr_t;
typedef struct {
u_char type_hi;
u_char type_lo;
u_char class_hi;
u_char class_lo;
} ngx_resolver_qs_t;
typedef struct {
u_char type_hi;
u_char type_lo;
u_char class_hi;
u_char class_lo;
u_char ttl[4];
u_char len_hi;
u_char len_lo;
} ngx_resolver_an_t;
#define ngx_resolver_node(n) \
(ngx_resolver_node_t *) \
((u_char *) (n) - offsetof(ngx_resolver_node_t, node))
ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc);
static void ngx_resolver_cleanup(void *data);
static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree);
static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r,
ngx_resolver_ctx_t *ctx);
static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree,
ngx_queue_t *queue);
static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r,
ngx_resolver_node_t *rn);
static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn,
ngx_resolver_ctx_t *ctx);
static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn,
ngx_resolver_ctx_t *ctx);
static void ngx_resolver_resend_handler(ngx_event_t *ev);
static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree,
ngx_queue_t *queue);
static void ngx_resolver_read_response(ngx_event_t *rev);
static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf,
size_t n);
static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n,
ngx_uint_t ident, ngx_uint_t code, ngx_uint_t qtype,
ngx_uint_t nan, ngx_uint_t ans);
static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n,
ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan);
static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r,
ngx_str_t *name, uint32_t hash);
static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r,
in_addr_t addr);
static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp,
ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name,
u_char *buf, u_char *src, u_char *last);
static void ngx_resolver_timeout_handler(ngx_event_t *ev);
static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn);
static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size);
static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size);
static void ngx_resolver_free(ngx_resolver_t *r, void *p);
static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p);
static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size);
static ngx_addr_t *ngx_resolver_export(ngx_resolver_t *r,
ngx_resolver_node_t *rn, ngx_uint_t rotate);
static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len);
#if (NGX_HAVE_INET6)
static void ngx_resolver_rbtree_insert_addr6_value(ngx_rbtree_node_t *temp,
ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
static ngx_resolver_node_t *ngx_resolver_lookup_addr6(ngx_resolver_t *r,
struct in6_addr *addr, uint32_t hash);
#endif
ngx_resolver_t *
ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
{
ngx_str_t s;
ngx_url_t u;
ngx_uint_t i, j;
ngx_resolver_t *r;
ngx_pool_cleanup_t *cln;
ngx_udp_connection_t *uc;
cln = ngx_pool_cleanup_add(cf->pool, 0);
if (cln == NULL) {
return NULL;
}
cln->handler = ngx_resolver_cleanup;
r = ngx_calloc(sizeof(ngx_resolver_t), cf->log);
if (r == NULL) {
return NULL;
}
cln->data = r;
r->event = ngx_calloc(sizeof(ngx_event_t), cf->log);
if (r->event == NULL) {
return NULL;
}
ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel,
ngx_resolver_rbtree_insert_value);
ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel,
ngx_rbtree_insert_value);
ngx_queue_init(&r->name_resend_queue);
ngx_queue_init(&r->addr_resend_queue);
ngx_queue_init(&r->name_expire_queue);
ngx_queue_init(&r->addr_expire_queue);
#if (NGX_HAVE_INET6)
r->ipv6 = 1;
ngx_rbtree_init(&r->addr6_rbtree, &r->addr6_sentinel,
ngx_resolver_rbtree_insert_addr6_value);
ngx_queue_init(&r->addr6_resend_queue);
ngx_queue_init(&r->addr6_expire_queue);
#endif
r->event->handler = ngx_resolver_resend_handler;
r->event->data = r;
r->event->log = &cf->cycle->new_log;
r->ident = -1;
r->resend_timeout = 5;
r->expire = 30;
r->valid = 0;
r->log = &cf->cycle->new_log;
r->log_level = NGX_LOG_ERR;
if (n) {
if (ngx_array_init(&r->udp_connections, cf->pool, n,
sizeof(ngx_udp_connection_t))
!= NGX_OK)
{
return NULL;
}
}
for (i = 0; i < n; i++) {
if (ngx_strncmp(names[i].data, "valid=", 6) == 0) {
s.len = names[i].len - 6;
s.data = names[i].data + 6;
r->valid = ngx_parse_time(&s, 1);
if (r->valid == (time_t) NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter: %V", &names[i]);
return NULL;
}
continue;
}
#if (NGX_HAVE_INET6)
if (ngx_strncmp(names[i].data, "ipv6=", 5) == 0) {
if (ngx_strcmp(&names[i].data[5], "on") == 0) {
r->ipv6 = 1;
} else if (ngx_strcmp(&names[i].data[5], "off") == 0) {
r->ipv6 = 0;
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter: %V", &names[i]);
return NULL;
}
continue;
}
#endif
ngx_memzero(&u, sizeof(ngx_url_t));
u.url = names[i];
u.default_port = 53;
if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
if (u.err) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"%s in resolver \"%V\"",
u.err, &u.url);
}
return NULL;
}
uc = ngx_array_push_n(&r->udp_connections, u.naddrs);
if (uc == NULL) {
return NULL;
}
ngx_memzero(uc, u.naddrs * sizeof(ngx_udp_connection_t));
for (j = 0; j < u.naddrs; j++) {
uc[j].sockaddr = u.addrs[j].sockaddr;
uc[j].socklen = u.addrs[j].socklen;
uc[j].server = u.addrs[j].name;
}
}
return r;
}
static void
ngx_resolver_cleanup(void *data)
{
ngx_resolver_t *r = data;
ngx_uint_t i;
ngx_udp_connection_t *uc;
if (r) {
ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
"cleanup resolver");
ngx_resolver_cleanup_tree(r, &r->name_rbtree);
ngx_resolver_cleanup_tree(r, &r->addr_rbtree);
#if (NGX_HAVE_INET6)
ngx_resolver_cleanup_tree(r, &r->addr6_rbtree);
#endif
if (r->event) {
ngx_free(r->event);
}
uc = r->udp_connections.elts;
for (i = 0; i < r->udp_connections.nelts; i++) {
if (uc[i].connection) {
ngx_close_connection(uc[i].connection);
}
}
ngx_free(r);
}
}
static void
ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree)
{
ngx_resolver_ctx_t *ctx, *next;
ngx_resolver_node_t *rn;
while (tree->root != tree->sentinel) {
rn = ngx_resolver_node(ngx_rbtree_min(tree->root, tree->sentinel));
ngx_queue_remove(&rn->queue);
for (ctx = rn->waiting; ctx; ctx = next) {
next = ctx->next;
if (ctx->event) {
ngx_resolver_free(r, ctx->event);
}
ngx_resolver_free(r, ctx);
}
ngx_rbtree_delete(tree, &rn->node);
ngx_resolver_free_node(r, rn);
}
}
ngx_resolver_ctx_t *
ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp)
{
in_addr_t addr;
ngx_resolver_ctx_t *ctx;
if (temp) {
addr = ngx_inet_addr(temp->name.data, temp->name.len);
if (addr != INADDR_NONE) {
temp->resolver = r;
temp->state = NGX_OK;
temp->naddrs = 1;
temp->addrs = &temp->addr;
temp->addr.sockaddr = (struct sockaddr *) &temp->sin;
temp->addr.socklen = sizeof(struct sockaddr_in);
ngx_memzero(&temp->sin, sizeof(struct sockaddr_in));
temp->sin.sin_family = AF_INET;
temp->sin.sin_addr.s_addr = addr;
temp->quick = 1;
return temp;
}
}
if (r->udp_connections.nelts == 0) {
return NGX_NO_RESOLVER;
}
ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t));
if (ctx) {
ctx->resolver = r;
}
return ctx;
}
ngx_int_t
ngx_resolve_name(ngx_resolver_ctx_t *ctx)
{
ngx_int_t rc;
ngx_resolver_t *r;
r = ctx->resolver;
if (ctx->name.len > 0 && ctx->name.data[ctx->name.len - 1] == '.') {
ctx->name.len--;
}
ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolve: \"%V\"", &ctx->name);
if (ctx->quick) {
ctx->handler(ctx);
return NGX_OK;
}
rc = ngx_resolve_name_locked(r, ctx);
if (rc == NGX_OK) {
return NGX_OK;
}
if (rc == NGX_AGAIN) {
return NGX_OK;
}
if (ctx->event) {
ngx_resolver_free(r, ctx->event);
}
ngx_resolver_free(r, ctx);
return NGX_ERROR;
}
void
ngx_resolve_name_done(ngx_resolver_ctx_t *ctx)
{
uint32_t hash;
ngx_resolver_t *r;
ngx_resolver_ctx_t *w, **p;
ngx_resolver_node_t *rn;
r = ctx->resolver;
ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolve name done: %i", ctx->state);
if (ctx->quick) {
return;
}
if (ctx->event && ctx->event->timer_set) {
ngx_del_timer(ctx->event);
}
if (ctx->state == NGX_AGAIN) {
hash = ngx_crc32_short(ctx->name.data, ctx->name.len);
rn = ngx_resolver_lookup_name(r, &ctx->name, hash);
if (rn) {
p = &rn->waiting;
w = rn->waiting;
while (w) {
if (w == ctx) {
*p = w->next;
goto done;
}
p = &w->next;
w = w->next;
}
}
ngx_log_error(NGX_LOG_ALERT, r->log, 0,
"could not cancel %V resolving", &ctx->name);
}
done:
ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue);
if (ctx->event) {
ngx_resolver_free_locked(r, ctx->event);
}
ngx_resolver_free_locked(r, ctx);
}
static ngx_int_t
ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx)
{
uint32_t hash;
ngx_int_t rc;
ngx_uint_t naddrs;
ngx_addr_t *addrs;
ngx_resolver_ctx_t *next;
ngx_resolver_node_t *rn;
ngx_strlow(ctx->name.data, ctx->name.data, ctx->name.len);
hash = ngx_crc32_short(ctx->name.data, ctx->name.len);
rn = ngx_resolver_lookup_name(r, &ctx->name, hash);
if (rn) {
if (rn->valid >= ngx_time()) {
ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached");
ngx_queue_remove(&rn->queue);
rn->expire = ngx_time() + r->expire;
ngx_queue_insert_head(&r->name_expire_queue, &rn->queue);
naddrs = (rn->naddrs == (u_short) -1) ? 0 : rn->naddrs;
#if (NGX_HAVE_INET6)
naddrs += (rn->naddrs6 == (u_short) -1) ? 0 : rn->naddrs6;
#endif
if (naddrs) {
if (naddrs == 1 && rn->naddrs == 1) {
addrs = NULL;
} else {
addrs = ngx_resolver_export(r, rn, 1);
if (addrs == NULL) {
return NGX_ERROR;
}
}
ctx->next = rn->waiting;
rn->waiting = NULL;
do {
ctx->state = NGX_OK;
ctx->naddrs = naddrs;
if (addrs == NULL) {
ctx->addrs = &ctx->addr;
ctx->addr.sockaddr = (struct sockaddr *) &ctx->sin;
ctx->addr.socklen = sizeof(struct sockaddr_in);
ngx_memzero(&ctx->sin, sizeof(struct sockaddr_in));
ctx->sin.sin_family = AF_INET;
ctx->sin.sin_addr.s_addr = rn->u.addr;
} else {
ctx->addrs = addrs;
}
next = ctx->next;
ctx->handler(ctx);
ctx = next;
} while (ctx);
if (addrs != NULL) {
ngx_resolver_free(r, addrs->sockaddr);
ngx_resolver_free(r, addrs);
}
return NGX_OK;
}
if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) {
ctx->name.len = rn->cnlen;
ctx->name.data = rn->u.cname;
return ngx_resolve_name_locked(r, ctx);
}
ctx->next = rn->waiting;
rn->waiting = NULL;
do {
ctx->state = NGX_RESOLVE_NXDOMAIN;
next = ctx->next;
ctx->handler(ctx);
ctx = next;
} while (ctx);
return NGX_OK;
}
if (rn->waiting) {
ctx->next = rn->waiting;
rn->waiting = ctx;
ctx->state = NGX_AGAIN;
return NGX_AGAIN;
}
ngx_queue_remove(&rn->queue);
if (rn->query) {
ngx_resolver_free_locked(r, rn->query);
rn->query = NULL;
#if (NGX_HAVE_INET6)
rn->query6 = NULL;
#endif
}
if (rn->cnlen) {
ngx_resolver_free_locked(r, rn->u.cname);
}
if (rn->naddrs > 1 && rn->naddrs != (u_short) -1) {
ngx_resolver_free_locked(r, rn->u.addrs);
}
#if (NGX_HAVE_INET6)
if (rn->naddrs6 > 1 && rn->naddrs6 != (u_short) -1) {
ngx_resolver_free_locked(r, rn->u6.addrs6);
}
#endif
} else {
rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t));
if (rn == NULL) {
return NGX_ERROR;
}
rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len);
if (rn->name == NULL) {
ngx_resolver_free(r, rn);
return NGX_ERROR;
}
rn->node.key = hash;
rn->nlen = (u_short) ctx->name.len;
rn->query = NULL;
#if (NGX_HAVE_INET6)
rn->query6 = NULL;
#endif
ngx_rbtree_insert(&r->name_rbtree, &rn->node);
}
rc = ngx_resolver_create_name_query(rn, ctx);
if (rc == NGX_ERROR) {
goto failed;
}
if (rc == NGX_DECLINED) {
ngx_rbtree_delete(&r->name_rbtree, &rn->node);
ngx_resolver_free(r, rn->query);
ngx_resolver_free(r, rn->name);
ngx_resolver_free(r, rn);
ctx->state = NGX_RESOLVE_NXDOMAIN;
ctx->handler(ctx);
return NGX_OK;
}
rn->naddrs = (u_short) -1;
#if (NGX_HAVE_INET6)
rn->naddrs6 = r->ipv6 ? (u_short) -1 : 0;
#endif
if (ngx_resolver_send_query(r, rn) != NGX_OK) {
goto failed;
}
if (ctx->event == NULL) {
ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t));
if (ctx->event == NULL) {
goto failed;
}
ctx->event->handler = ngx_resolver_timeout_handler;
ctx->event->data = rn;
ctx->event->log = r->log;
rn->ident = -1;
ngx_add_timer(ctx->event, ctx->timeout);
}
if (ngx_queue_empty(&r->name_resend_queue)) {
ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000));
}
rn->expire = ngx_time() + r->resend_timeout;
ngx_queue_insert_head(&r->name_resend_queue, &rn->queue);
rn->code = 0;
rn->cnlen = 0;
rn->valid = 0;
rn->ttl = NGX_MAX_UINT32_VALUE;
rn->waiting = ctx;
ctx->state = NGX_AGAIN;
return NGX_AGAIN;
failed:
ngx_rbtree_delete(&r->name_rbtree, &rn->node);
if (rn->query) {
ngx_resolver_free(r, rn->query);
}
ngx_resolver_free(r, rn->name);
ngx_resolver_free(r, rn);
return NGX_ERROR;
}
ngx_int_t
ngx_resolve_addr(ngx_resolver_ctx_t *ctx)
{
u_char *name;
in_addr_t addr;
ngx_queue_t *resend_queue, *expire_queue;
ngx_rbtree_t *tree;
ngx_resolver_t *r;
struct sockaddr_in *sin;
ngx_resolver_node_t *rn;
#if (NGX_HAVE_INET6)
uint32_t hash;
struct sockaddr_in6 *sin6;
#endif
#if (NGX_SUPPRESS_WARN)
addr = 0;
#if (NGX_HAVE_INET6)
hash = 0;
sin6 = NULL;
#endif
#endif
r = ctx->resolver;
switch (ctx->addr.sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
sin6 = (struct sockaddr_in6 *) ctx->addr.sockaddr;
hash = ngx_crc32_short(sin6->sin6_addr.s6_addr, 16);
rn = ngx_resolver_lookup_addr6(r, &sin6->sin6_addr, hash);
tree = &r->addr6_rbtree;
resend_queue = &r->addr6_resend_queue;
expire_queue = &r->addr6_expire_queue;
break;
#endif
default:
sin = (struct sockaddr_in *) ctx->addr.sockaddr;
addr = ntohl(sin->sin_addr.s_addr);
rn = ngx_resolver_lookup_addr(r, addr);
tree = &r->addr_rbtree;
resend_queue = &r->addr_resend_queue;
expire_queue = &r->addr_expire_queue;
}
if (rn) {
if (rn->valid >= ngx_time()) {
ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached");
ngx_queue_remove(&rn->queue);
rn->expire = ngx_time() + r->expire;
ngx_queue_insert_head(expire_queue, &rn->queue);
name = ngx_resolver_dup(r, rn->name, rn->nlen);
if (name == NULL) {
goto failed;
}
ctx->name.len = rn->nlen;
ctx->name.data = name;
ctx->state = NGX_OK;
ctx->handler(ctx);
ngx_resolver_free(r, name);
return NGX_OK;
}
if (rn->waiting) {
ctx->next = rn->waiting;
rn->waiting = ctx;
ctx->state = NGX_AGAIN;
return NGX_OK;
}
ngx_queue_remove(&rn->queue);
ngx_resolver_free(r, rn->query);
rn->query = NULL;
#if (NGX_HAVE_INET6)
rn->query6 = NULL;
#endif
} else {
rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t));
if (rn == NULL) {
goto failed;
}
switch (ctx->addr.sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
rn->addr6 = sin6->sin6_addr;
rn->node.key = hash;
break;
#endif
default:
rn->node.key = addr;
}
rn->query = NULL;
#if (NGX_HAVE_INET6)
rn->query6 = NULL;
#endif
ngx_rbtree_insert(tree, &rn->node);
}
if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) {
goto failed;
}
rn->naddrs = (u_short) -1;
#if (NGX_HAVE_INET6)
rn->naddrs6 = (u_short) -1;
#endif
if (ngx_resolver_send_query(r, rn) != NGX_OK) {
goto failed;
}
ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t));
if (ctx->event == NULL) {
goto failed;
}
ctx->event->handler = ngx_resolver_timeout_handler;
ctx->event->data = rn;
ctx->event->log = r->log;
rn->ident = -1;
ngx_add_timer(ctx->event, ctx->timeout);
if (ngx_queue_empty(resend_queue)) {
ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000));
}
rn->expire = ngx_time() + r->resend_timeout;
ngx_queue_insert_head(resend_queue, &rn->queue);
rn->code = 0;
rn->cnlen = 0;
rn->name = NULL;
rn->nlen = 0;
rn->valid = 0;
rn->ttl = NGX_MAX_UINT32_VALUE;
rn->waiting = ctx;
ctx->state = NGX_AGAIN;
return NGX_OK;
failed:
if (rn) {
ngx_rbtree_delete(tree, &rn->node);
if (rn->query) {
ngx_resolver_free(r, rn->query);
}
ngx_resolver_free(r, rn);
}
if (ctx->event) {
ngx_resolver_free(r, ctx->event);
}
ngx_resolver_free(r, ctx);
return NGX_ERROR;
}
void
ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx)
{
in_addr_t addr;
ngx_queue_t *expire_queue;
ngx_rbtree_t *tree;
ngx_resolver_t *r;
ngx_resolver_ctx_t *w, **p;
struct sockaddr_in *sin;
ngx_resolver_node_t *rn;
#if (NGX_HAVE_INET6)
uint32_t hash;
struct sockaddr_in6 *sin6;
#endif
r = ctx->resolver;
switch (ctx->addr.sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
tree = &r->addr6_rbtree;
expire_queue = &r->addr6_expire_queue;
break;
#endif
default:
tree = &r->addr_rbtree;
expire_queue = &r->addr_expire_queue;
}
ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolve addr done: %i", ctx->state);
if (ctx->event && ctx->event->timer_set) {
ngx_del_timer(ctx->event);
}
if (ctx->state == NGX_AGAIN) {
switch (ctx->addr.sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
sin6 = (struct sockaddr_in6 *) ctx->addr.sockaddr;
hash = ngx_crc32_short(sin6->sin6_addr.s6_addr, 16);
rn = ngx_resolver_lookup_addr6(r, &sin6->sin6_addr, hash);
break;
#endif
default:
sin = (struct sockaddr_in *) ctx->addr.sockaddr;
addr = ntohl(sin->sin_addr.s_addr);
rn = ngx_resolver_lookup_addr(r, addr);
}
if (rn) {
p = &rn->waiting;
w = rn->waiting;
while (w) {
if (w == ctx) {
*p = w->next;
goto done;
}
p = &w->next;
w = w->next;
}
}
{
u_char text[NGX_SOCKADDR_STRLEN];
ngx_str_t addrtext;
addrtext.data = text;
addrtext.len = ngx_sock_ntop(ctx->addr.sockaddr, ctx->addr.socklen,
text, NGX_SOCKADDR_STRLEN, 0);
ngx_log_error(NGX_LOG_ALERT, r->log, 0,
"could not cancel %V resolving", &addrtext);
}
}
done:
ngx_resolver_expire(r, tree, expire_queue);
if (ctx->event) {
ngx_resolver_free_locked(r, ctx->event);
}
ngx_resolver_free_locked(r, ctx);
}
static void
ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue)
{
time_t now;
ngx_uint_t i;
ngx_queue_t *q;
ngx_resolver_node_t *rn;
ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire");
now = ngx_time();
for (i = 0; i < 2; i++) {
if (ngx_queue_empty(queue)) {
return;
}
q = ngx_queue_last(queue);
rn = ngx_queue_data(q, ngx_resolver_node_t, queue);
if (now <= rn->expire) {
return;
}
ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolver expire \"%*s\"", (size_t) rn->nlen, rn->name);
ngx_queue_remove(q);
ngx_rbtree_delete(tree, &rn->node);
ngx_resolver_free_node(r, rn);
}
}
static ngx_int_t
ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn)
{
ssize_t n;
ngx_udp_connection_t *uc;
uc = r->udp_connections.elts;
uc = &uc[r->last_connection++];
if (r->last_connection == r->udp_connections.nelts) {
r->last_connection = 0;
}
if (uc->connection == NULL) {
uc->log = *r->log;
uc->log.handler = ngx_resolver_log_error;
uc->log.data = uc;
uc->log.action = "resolving";
if (ngx_udp_connect(uc) != NGX_OK) {
return NGX_ERROR;
}
uc->connection->data = r;
uc->connection->read->handler = ngx_resolver_read_response;
uc->connection->read->resolver = 1;
}
if (rn->naddrs == (u_short) -1) {
n = ngx_send(uc->connection, rn->query, rn->qlen);
if (n == -1) {
return NGX_ERROR;
}
if ((size_t) n != (size_t) rn->qlen) {
ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete");
return NGX_ERROR;
}
}
#if (NGX_HAVE_INET6)
if (rn->query6 && rn->naddrs6 == (u_short) -1) {
n = ngx_send(uc->connection, rn->query6, rn->qlen);
if (n == -1) {
return NGX_ERROR;
}
if ((size_t) n != (size_t) rn->qlen) {
ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete");
return NGX_ERROR;
}
}
#endif
return NGX_OK;
}
static void
ngx_resolver_resend_handler(ngx_event_t *ev)
{
time_t timer, atimer, ntimer;
#if (NGX_HAVE_INET6)
time_t a6timer;
#endif
ngx_resolver_t *r;
r = ev->data;
ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolver resend handler");
ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue);
atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue);
#if (NGX_HAVE_INET6)
a6timer = ngx_resolver_resend(r, &r->addr6_rbtree, &r->addr6_resend_queue);
#endif
timer = ntimer;
if (timer == 0) {
timer = atimer;
} else if (atimer) {
timer = ngx_min(timer, atimer);
}
#if (NGX_HAVE_INET6)
if (timer == 0) {
timer = a6timer;
} else if (a6timer) {
timer = ngx_min(timer, a6timer);
}
#endif
if (timer) {
ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000));
}
}
static time_t
ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue)
{
time_t now;
ngx_queue_t *q;
ngx_resolver_node_t *rn;
now = ngx_time();
for ( ;; ) {
if (ngx_queue_empty(queue)) {
return 0;
}
q = ngx_queue_last(queue);
rn = ngx_queue_data(q, ngx_resolver_node_t, queue);
if (now < rn->expire) {
return rn->expire - now;
}
ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolver resend \"%*s\" %p",
(size_t) rn->nlen, rn->name, rn->waiting);
ngx_queue_remove(q);
if (rn->waiting) {
(void) ngx_resolver_send_query(r, rn);
rn->expire = now + r->resend_timeout;
ngx_queue_insert_head(queue, q);
continue;
}
ngx_rbtree_delete(tree, &rn->node);
ngx_resolver_free_node(r, rn);
}
}
static void
ngx_resolver_read_response(ngx_event_t *rev)
{
ssize_t n;
ngx_connection_t *c;
u_char buf[NGX_RESOLVER_UDP_SIZE];
c = rev->data;
do {
n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE);
if (n < 0) {
return;
}
ngx_resolver_process_response(c->data, buf, n);
} while (rev->ready);
}
static void
ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n)
{
char *err;
ngx_uint_t i, times, ident, qident, flags, code, nqs, nan,
qtype, qclass;
#if (NGX_HAVE_INET6)
ngx_uint_t qident6;
#endif
ngx_queue_t *q;
ngx_resolver_qs_t *qs;
ngx_resolver_hdr_t *response;
ngx_resolver_node_t *rn;
if (n < sizeof(ngx_resolver_hdr_t)) {
goto short_response;
}
response = (ngx_resolver_hdr_t *) buf;
ident = (response->ident_hi << 8) + response->ident_lo;
flags = (response->flags_hi << 8) + response->flags_lo;
nqs = (response->nqs_hi << 8) + response->nqs_lo;
nan = (response->nan_hi << 8) + response->nan_lo;
ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolver DNS response %ui fl:%04Xui %ui/%ui/%ud/%ud",
ident, flags, nqs, nan,
(response->nns_hi << 8) + response->nns_lo,
(response->nar_hi << 8) + response->nar_lo);
if ((flags & 0xf870) != 0x8000) {
ngx_log_error(r->log_level, r->log, 0,
"invalid DNS response %ui fl:%04Xui", ident, flags);
return;
}
code = flags & 0xf;
if (code == NGX_RESOLVE_FORMERR) {
times = 0;
for (q = ngx_queue_head(&r->name_resend_queue);
q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100;
q = ngx_queue_next(q))
{
rn = ngx_queue_data(q, ngx_resolver_node_t, queue);
qident = (rn->query[0] << 8) + rn->query[1];
if (qident == ident) {
goto dns_error_name;
}
#if (NGX_HAVE_INET6)
if (rn->query6) {
qident6 = (rn->query6[0] << 8) + rn->query6[1];
if (qident6 == ident) {
goto dns_error_name;
}
}
#endif
}
goto dns_error;
}
if (code > NGX_RESOLVE_REFUSED) {
goto dns_error;
}
if (nqs != 1) {
err = "invalid number of questions in DNS response";
goto done;
}
i = sizeof(ngx_resolver_hdr_t);
while (i < (ngx_uint_t) n) {
if (buf[i] == '\0') {
goto found;
}
i += 1 + buf[i];
}
goto short_response;
found:
if (i++ == sizeof(ngx_resolver_hdr_t)) {
err = "zero-length domain name in DNS response";
goto done;
}
if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t))
> (ngx_uint_t) n)
{
goto short_response;
}
qs = (ngx_resolver_qs_t *) &buf[i];
qtype = (qs->type_hi << 8) + qs->type_lo;
qclass = (qs->class_hi << 8) + qs->class_lo;
ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolver DNS response qt:%ui cl:%ui", qtype, qclass);
if (qclass != 1) {
ngx_log_error(r->log_level, r->log, 0,
"unknown query class %ui in DNS response", qclass);
return;
}
switch (qtype) {
case NGX_RESOLVE_A:
#if (NGX_HAVE_INET6)
case NGX_RESOLVE_AAAA:
#endif
ngx_resolver_process_a(r, buf, n, ident, code, qtype, nan,
i + sizeof(ngx_resolver_qs_t));
break;
case NGX_RESOLVE_PTR:
ngx_resolver_process_ptr(r, buf, n, ident, code, nan);
break;
default:
ngx_log_error(r->log_level, r->log, 0,
"unknown query type %ui in DNS response", qtype);
return;
}
return;
short_response:
err = "short DNS response";
done:
ngx_log_error(r->log_level, r->log, 0, err);
return;
dns_error_name:
ngx_log_error(r->log_level, r->log, 0,
"DNS error (%ui: %s), query id:%ui, name:\"%*s\"",
code, ngx_resolver_strerror(code), ident,
rn->nlen, rn->name);
return;
dns_error:
ngx_log_error(r->log_level, r->log, 0,
"DNS error (%ui: %s), query id:%ui",
code, ngx_resolver_strerror(code), ident);
return;
}
static void
ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last,
ngx_uint_t ident, ngx_uint_t code, ngx_uint_t qtype,
ngx_uint_t nan, ngx_uint_t ans)
{
char *err;
u_char *cname;
size_t len;
int32_t ttl;
uint32_t hash;
in_addr_t *addr;
ngx_str_t name;
ngx_addr_t *addrs;
ngx_uint_t type, class, qident, naddrs, a, i, n, start;
#if (NGX_HAVE_INET6)
struct in6_addr *addr6;
#endif
ngx_resolver_an_t *an;
ngx_resolver_ctx_t *ctx, *next;
ngx_resolver_node_t *rn;
if (ngx_resolver_copy(r, &name, buf,
buf + sizeof(ngx_resolver_hdr_t), buf + last)
!= NGX_OK)
{
return;
}
ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name);
hash = ngx_crc32_short(name.data, name.len);
rn = ngx_resolver_lookup_name(r, &name, hash);
if (rn == NULL) {
ngx_log_error(r->log_level, r->log, 0,
"unexpected response for %V", &name);
ngx_resolver_free(r, name.data);
goto failed;
}
switch (qtype) {
#if (NGX_HAVE_INET6)
case NGX_RESOLVE_AAAA:
if (rn->query6 == NULL || rn->naddrs6 != (u_short) -1) {
ngx_log_error(r->log_level, r->log, 0,
"unexpected response for %V", &name);
ngx_resolver_free(r, name.data);
goto failed;
}
qident = (rn->query6[0] << 8) + rn->query6[1];
break;
#endif
default:
if (rn->query == NULL || rn->naddrs != (u_short) -1) {
ngx_log_error(r->log_level, r->log, 0,
"unexpected response for %V", &name);
ngx_resolver_free(r, name.data);
goto failed;
}
qident = (rn->query[0] << 8) + rn->query[1];
}
if (ident != qident) {
ngx_log_error(r->log_level, r->log, 0,
"wrong ident %ui response for %V, expect %ui",
ident, &name, qident);
ngx_resolver_free(r, name.data);
goto failed;
}
ngx_resolver_free(r, name.data);
if (code == 0 && rn->code) {
code = rn->code;
}
if (code == 0 && nan == 0) {
#if (NGX_HAVE_INET6)
switch (qtype) {
case NGX_RESOLVE_AAAA:
rn->naddrs6 = 0;
if (rn->naddrs == (u_short) -1) {
goto next;
}
if (rn->naddrs) {
goto export;
}
break;
default:
rn->naddrs = 0;
if (rn->naddrs6 == (u_short) -1) {
goto next;
}
if (rn->naddrs6) {
goto export;
}
}
#endif
code = NGX_RESOLVE_NXDOMAIN;
}
if (code) {
#if (NGX_HAVE_INET6)
switch (qtype) {
case NGX_RESOLVE_AAAA:
rn->naddrs6 = 0;
if (rn->naddrs == (u_short) -1) {
rn->code = (u_char) code;
goto next;
}
break;
default:
rn->naddrs = 0;
if (rn->naddrs6 == (u_short) -1) {
rn->code = (u_char) code;
goto next;
}
}
#endif
next = rn->waiting;
rn->waiting = NULL;
ngx_queue_remove(&rn->queue);
ngx_rbtree_delete(&r->name_rbtree, &rn->node);
while (next) {
ctx = next;
ctx->state = code;
next = ctx->next;
ctx->handler(ctx);
}
ngx_resolver_free_node(r, rn);
return;
}
i = ans;
naddrs = 0;
cname = NULL;
for (a = 0; a < nan; a++) {
start = i;
while (i < last) {
if (buf[i] & 0xc0) {
i += 2;
goto found;
}
if (buf[i] == 0) {
i++;
goto test_length;
}
i += 1 + buf[i];
}
goto short_response;
test_length:
if (i - start < 2) {
err = "invalid name in DNS response";
goto invalid;
}
found:
if (i + sizeof(ngx_resolver_an_t) >= last) {
goto short_response;
}
an = (ngx_resolver_an_t *) &buf[i];
type = (an->type_hi << 8) + an->type_lo;
class = (an->class_hi << 8) + an->class_lo;
len = (an->len_hi << 8) + an->len_lo;
ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16)
+ (an->ttl[2] << 8) + (an->ttl[3]);
if (class != 1) {
ngx_log_error(r->log_level, r->log, 0,
"unexpected RR class %ui", class);
goto failed;
}
if (ttl < 0) {
ttl = 0;
}
rn->ttl = ngx_min(rn->ttl, (uint32_t) ttl);
i += sizeof(ngx_resolver_an_t);
switch (type) {
case NGX_RESOLVE_A:
if (qtype != NGX_RESOLVE_A) {
err = "unexpected A record in DNS response";
goto invalid;
}
if (len != 4) {
err = "invalid A record in DNS response";
goto invalid;
}
if (i + 4 > last) {
goto short_response;
}
naddrs++;
break;
#if (NGX_HAVE_INET6)
case NGX_RESOLVE_AAAA:
if (qtype != NGX_RESOLVE_AAAA) {
err = "unexpected AAAA record in DNS response";
goto invalid;
}
if (len != 16) {
err = "invalid AAAA record in DNS response";
goto invalid;
}
if (i + 16 > last) {
goto short_response;
}
naddrs++;
break;
#endif
case NGX_RESOLVE_CNAME:
cname = &buf[i];
break;
case NGX_RESOLVE_DNAME:
break;
default:
ngx_log_error(r->log_level, r->log, 0,
"unexpected RR type %ui", type);
}
i += len;
}
ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolver naddrs:%ui cname:%p ttl:%uD",
naddrs, cname, rn->ttl);
if (naddrs) {
switch (qtype) {
#if (NGX_HAVE_INET6)
case NGX_RESOLVE_AAAA:
if (naddrs == 1) {
addr6 = &rn->u6.addr6;
rn->naddrs6 = 1;
} else {
addr6 = ngx_resolver_alloc(r, naddrs * sizeof(struct in6_addr));
if (addr6 == NULL) {
goto failed;
}
rn->u6.addrs6 = addr6;
rn->naddrs6 = (u_short) naddrs;
}
#if (NGX_SUPPRESS_WARN)
addr = NULL;
#endif
break;
#endif
default:
if (naddrs == 1) {
addr = &rn->u.addr;
rn->naddrs = 1;
} else {
addr = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t));
if (addr == NULL) {
goto failed;
}
rn->u.addrs = addr;
rn->naddrs = (u_short) naddrs;
}
#if (NGX_HAVE_INET6 && NGX_SUPPRESS_WARN)
addr6 = NULL;
#endif
}
n = 0;
i = ans;
for (a = 0; a < nan; a++) {
for ( ;; ) {
if (buf[i] & 0xc0) {
i += 2;
break;
}
if (buf[i] == 0) {
i++;
break;
}
i += 1 + buf[i];
}
an = (ngx_resolver_an_t *) &buf[i];
type = (an->type_hi << 8) + an->type_lo;
len = (an->len_hi << 8) + an->len_lo;
i += sizeof(ngx_resolver_an_t);
if (type == NGX_RESOLVE_A) {
addr[n] = htonl((buf[i] << 24) + (buf[i + 1] << 16)
+ (buf[i + 2] << 8) + (buf[i + 3]));
if (++n == naddrs) {
#if (NGX_HAVE_INET6)
if (rn->naddrs6 == (u_short) -1) {
goto next;
}
#endif
break;
}
}
#if (NGX_HAVE_INET6)
else if (type == NGX_RESOLVE_AAAA) {
ngx_memcpy(addr6[n].s6_addr, &buf[i], 16);
if (++n == naddrs) {
if (rn->naddrs == (u_short) -1) {
goto next;
}
break;
}
}
#endif
i += len;
}
}
switch (qtype) {
#if (NGX_HAVE_INET6)
case NGX_RESOLVE_AAAA:
if (rn->naddrs6 == (u_short) -1) {
rn->naddrs6 = 0;
}
break;
#endif
default:
if (rn->naddrs == (u_short) -1) {
rn->naddrs = 0;
}
}
if (rn->naddrs != (u_short) -1
#if (NGX_HAVE_INET6)
&& rn->naddrs6 != (u_short) -1
#endif
&& rn->naddrs
#if (NGX_HAVE_INET6)
+ rn->naddrs6
#endif
> 0)
{
#if (NGX_HAVE_INET6)
export:
#endif
naddrs = rn->naddrs;
#if (NGX_HAVE_INET6)
naddrs += rn->naddrs6;
#endif
if (naddrs == 1 && rn->naddrs == 1) {
addrs = NULL;
} else {
addrs = ngx_resolver_export(r, rn, 0);
if (addrs == NULL) {
goto failed;
}
}
ngx_queue_remove(&rn->queue);
rn->valid = ngx_time() + (r->valid ? r->valid : (time_t) rn->ttl);
rn->expire = ngx_time() + r->expire;
ngx_queue_insert_head(&r->name_expire_queue, &rn->queue);
next = rn->waiting;
rn->waiting = NULL;
while (next) {
ctx = next;
ctx->state = NGX_OK;
ctx->naddrs = naddrs;
if (addrs == NULL) {
ctx->addrs = &ctx->addr;
ctx->addr.sockaddr = (struct sockaddr *) &ctx->sin;
ctx->addr.socklen = sizeof(struct sockaddr_in);
ngx_memzero(&ctx->sin, sizeof(struct sockaddr_in));
ctx->sin.sin_family = AF_INET;
ctx->sin.sin_addr.s_addr = rn->u.addr;
} else {
ctx->addrs = addrs;
}
next = ctx->next;
ctx->handler(ctx);
}
if (addrs != NULL) {
ngx_resolver_free(r, addrs->sockaddr);
ngx_resolver_free(r, addrs);
}
ngx_resolver_free(r, rn->query);
rn->query = NULL;
#if (NGX_HAVE_INET6)
rn->query6 = NULL;
#endif
return;
}
if (cname) {
if (rn->naddrs == (u_short) -1
#if (NGX_HAVE_INET6)
|| rn->naddrs6 == (u_short) -1
#endif
)
{
goto next;
}
if (ngx_resolver_copy(r, &name, buf, cname, buf + last) != NGX_OK) {
goto failed;
}
ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolver cname:\"%V\"", &name);
ngx_queue_remove(&rn->queue);
rn->cnlen = (u_short) name.len;
rn->u.cname = name.data;
rn->valid = ngx_time() + (r->valid ? r->valid : (time_t) rn->ttl);
rn->expire = ngx_time() + r->expire;
ngx_queue_insert_head(&r->name_expire_queue, &rn->queue);
ctx = rn->waiting;
rn->waiting = NULL;
if (ctx) {
ctx->name = name;
(void) ngx_resolve_name_locked(r, ctx);
}
ngx_resolver_free(r, rn->query);
rn->query = NULL;
#if (NGX_HAVE_INET6)
rn->query6 = NULL;
#endif
return;
}
ngx_log_error(r->log_level, r->log, 0,
"no A or CNAME types in DNS response");
return;
short_response:
err = "short DNS response";
invalid:
ngx_log_error(r->log_level, r->log, 0, err);
return;
failed:
next:
return;
}
static void
ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n,
ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan)
{
char *err;
size_t len;
u_char text[NGX_SOCKADDR_STRLEN];
in_addr_t addr;
int32_t ttl;
ngx_int_t octet;
ngx_str_t name;
ngx_uint_t i, mask, qident, class;
ngx_queue_t *expire_queue;
ngx_rbtree_t *tree;
ngx_resolver_an_t *an;
ngx_resolver_ctx_t *ctx, *next;
ngx_resolver_node_t *rn;
#if (NGX_HAVE_INET6)
uint32_t hash;
ngx_int_t digit;
struct in6_addr addr6;
#endif
if (ngx_resolver_copy(r, NULL, buf,
buf + sizeof(ngx_resolver_hdr_t), buf + n)
!= NGX_OK)
{
return;
}
addr = 0;
i = sizeof(ngx_resolver_hdr_t);
for (mask = 0; mask < 32; mask += 8) {
len = buf[i++];
octet = ngx_atoi(&buf[i], len);
if (octet == NGX_ERROR || octet > 255) {
goto invalid_in_addr_arpa;
}
addr += octet << mask;
i += len;
}
if (ngx_strcasecmp(&buf[i], (u_char *) "\7in-addr\4arpa") == 0) {
i += sizeof("\7in-addr\4arpa");
rn = ngx_resolver_lookup_addr(r, addr);
tree = &r->addr_rbtree;
expire_queue = &r->addr_expire_queue;
addr = htonl(addr);
name.len = ngx_inet_ntop(AF_INET, &addr, text, NGX_SOCKADDR_STRLEN);
name.data = text;
goto valid;
}
invalid_in_addr_arpa:
#if (NGX_HAVE_INET6)
i = sizeof(ngx_resolver_hdr_t);
for (octet = 15; octet >= 0; octet--) {
if (buf[i++] != '\1') {
goto invalid_ip6_arpa;
}
digit = ngx_hextoi(&buf[i++], 1);
if (digit == NGX_ERROR) {
goto invalid_ip6_arpa;
}
addr6.s6_addr[octet] = (u_char) digit;
if (buf[i++] != '\1') {
goto invalid_ip6_arpa;
}
digit = ngx_hextoi(&buf[i++], 1);
if (digit == NGX_ERROR) {
goto invalid_ip6_arpa;
}
addr6.s6_addr[octet] += (u_char) (digit * 16);
}
if (ngx_strcasecmp(&buf[i], (u_char *) "\3ip6\4arpa") == 0) {
i += sizeof("\3ip6\4arpa");
hash = ngx_crc32_short(addr6.s6_addr, 16);
rn = ngx_resolver_lookup_addr6(r, &addr6, hash);
tree = &r->addr6_rbtree;
expire_queue = &r->addr6_expire_queue;
name.len = ngx_inet6_ntop(addr6.s6_addr, text, NGX_SOCKADDR_STRLEN);
name.data = text;
goto valid;
}
invalid_ip6_arpa:
#endif
ngx_log_error(r->log_level, r->log, 0,
"invalid in-addr.arpa or ip6.arpa name in DNS response");
return;
valid:
if (rn == NULL || rn->query == NULL) {
ngx_log_error(r->log_level, r->log, 0,
"unexpected response for %V", &name);
goto failed;
}
qident = (rn->query[0] << 8) + rn->query[1];
if (ident != qident) {
ngx_log_error(r->log_level, r->log, 0,
"wrong ident %ui response for %V, expect %ui",
ident, &name, qident);
goto failed;
}
if (code == 0 && nan == 0) {
code = NGX_RESOLVE_NXDOMAIN;
}
if (code) {
next = rn->waiting;
rn->waiting = NULL;
ngx_queue_remove(&rn->queue);
ngx_rbtree_delete(tree, &rn->node);
while (next) {
ctx = next;
ctx->state = code;
next = ctx->next;
ctx->handler(ctx);
}
ngx_resolver_free_node(r, rn);
return;
}
i += sizeof(ngx_resolver_qs_t);
if (i + 2 + sizeof(ngx_resolver_an_t) >= n) {
goto short_response;
}
if (buf[i] != 0xc0 || buf[i + 1] != sizeof(ngx_resolver_hdr_t)) {
err = "invalid in-addr.arpa or ip6.arpa name in DNS response";
goto invalid;
}
an = (ngx_resolver_an_t *) &buf[i + 2];
class = (an->class_hi << 8) + an->class_lo;
len = (an->len_hi << 8) + an->len_lo;
ttl = (an->ttl[0] << 24) + (an->ttl[1] << 16)
+ (an->ttl[2] << 8) + (an->ttl[3]);
if (class != 1) {
ngx_log_error(r->log_level, r->log, 0,
"unexpected RR class %ui", class);
goto failed;
}
if (ttl < 0) {
ttl = 0;
}
ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0,
"resolver qt:%ui cl:%ui len:%uz",
(an->type_hi << 8) + an->type_lo,
class, len);
i += 2 + sizeof(ngx_resolver_an_t);
if (i + len > n) {
goto short_response;
}
if (ngx_resolver_copy(r, &name, buf, buf + i, buf + n) != NGX_OK) {
goto failed;
}
ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name);
if (name.len != (size_t) rn->nlen
|| ngx_strncmp(name.data, rn->name, name.len) != 0)
{
if (rn->nlen) {
ngx_resolver_free(r, rn->name);
}
rn->nlen = (u_short) name.len;
rn->name = name.data;
name.data = ngx_resolver_dup(r, rn->name, name.len);
if (name.data == NULL) {
goto failed;
}
}
ngx_queue_remove(&rn->queue);
rn->valid = ngx_time() + (r->valid ? r->valid : ttl);
rn->expire = ngx_time() + r->expire;
ngx_queue_insert_head(expire_queue, &rn->queue);
next = rn->waiting;
rn->waiting = NULL;
while (next) {
ctx = next;
ctx->state = NGX_OK;
ctx->name = name;
next = ctx->next;
ctx->handler(ctx);
}
ngx_resolver_free(r, name.data);
return;
short_response:
err = "short DNS response";
invalid:
ngx_log_error(r->log_level, r->log, 0, err);
return;
failed:
return;
}
static ngx_resolver_node_t *
ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash)
{
ngx_int_t rc;
ngx_rbtree_node_t *node, *sentinel;
ngx_resolver_node_t *rn;
node = r->name_rbtree.root;
sentinel = r->name_rbtree.sentinel;
while (node != sentinel) {
if (hash < node->key) {
node = node->left;
continue;
}
if (hash > node->key) {
node = node->right;
continue;
}
rn = ngx_resolver_node(node);
rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen);
if (rc == 0) {
return rn;
}
node = (rc < 0) ? node->left : node->right;
}
return NULL;
}
static ngx_resolver_node_t *
ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr)
{
ngx_rbtree_node_t *node, *sentinel;
node = r->addr_rbtree.root;
sentinel = r->addr_rbtree.sentinel;
while (node != sentinel) {
if (addr < node->key) {
node = node->left;
continue;
}
if (addr > node->key) {
node = node->right;
continue;
}
return ngx_resolver_node(node);
}
return NULL;
}
#if (NGX_HAVE_INET6)
static ngx_resolver_node_t *
ngx_resolver_lookup_addr6(ngx_resolver_t *r, struct in6_addr *addr,
uint32_t hash)
{
ngx_int_t rc;
ngx_rbtree_node_t *node, *sentinel;
ngx_resolver_node_t *rn;
node = r->addr6_rbtree.root;
sentinel = r->addr6_rbtree.sentinel;
while (node != sentinel) {
if (hash < node->key) {
node = node->left;
continue;
}
if (hash > node->key) {
node = node->right;
continue;
}
rn = ngx_resolver_node(node);
rc = ngx_memcmp(addr, &rn->addr6, 16);
if (rc == 0) {
return rn;
}
node = (rc < 0) ? node->left : node->right;
}
return NULL;
}
#endif
static void
ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp,
ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
{
ngx_rbtree_node_t **p;
ngx_resolver_node_t *rn, *rn_temp;
for ( ;; ) {
if (node->key < temp->key) {
p = &temp->left;
} else if (node->key > temp->key) {
p = &temp->right;
} else {
rn = ngx_resolver_node(node);
rn_temp = ngx_resolver_node(temp);
p = (ngx_memn2cmp(rn->name, rn_temp->name, rn->nlen, rn_temp->nlen)
< 0) ? &temp->left : &temp->right;
}
if (*p == sentinel) {
break;
}
temp = *p;
}
*p = node;
node->parent = temp;
node->left = sentinel;
node->right = sentinel;
ngx_rbt_red(node);
}
#if (NGX_HAVE_INET6)
static void
ngx_resolver_rbtree_insert_addr6_value(ngx_rbtree_node_t *temp,
ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
{
ngx_rbtree_node_t **p;
ngx_resolver_node_t *rn, *rn_temp;
for ( ;; ) {
if (node->key < temp->key) {
p = &temp->left;
} else if (node->key > temp->key) {
p = &temp->right;
} else {
rn = ngx_resolver_node(node);
rn_temp = ngx_resolver_node(temp);
p = (ngx_memcmp(&rn->addr6, &rn_temp->addr6, 16)
< 0) ? &temp->left : &temp->right;
}
if (*p == sentinel) {
break;
}
temp = *p;
}
*p = node;
node->parent = temp;
node->left = sentinel;
node->right = sentinel;
ngx_rbt_red(node);
}
#endif
static ngx_int_t
ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx)
{
u_char *p, *s;
size_t len, nlen;
ngx_uint_t ident;
#if (NGX_HAVE_INET6)
ngx_resolver_t *r;
#endif
ngx_resolver_qs_t *qs;
ngx_resolver_hdr_t *query;
nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1;
len = sizeof(ngx_resolver_hdr_t) + nlen + sizeof(ngx_resolver_qs_t);
#if (NGX_HAVE_INET6)
r = ctx->resolver;
p = ngx_resolver_alloc(ctx->resolver, r->ipv6 ? len * 2 : len);
#else
p = ngx_resolver_alloc(ctx->resolver, len);
#endif
if (p == NULL) {
return NGX_ERROR;
}
rn->qlen = (u_short) len;
rn->query = p;
#if (NGX_HAVE_INET6)
if (r->ipv6) {
rn->query6 = p + len;
}
#endif
query = (ngx_resolver_hdr_t *) p;
ident = ngx_random();
ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0,
"resolve: \"%V\" A %i", &ctx->name, ident & 0xffff);
query->ident_hi = (u_char) ((ident >> 8) & 0xff);
query->ident_lo = (u_char) (ident & 0xff);
query->flags_hi = 1; query->flags_lo = 0;
query->nqs_hi = 0; query->nqs_lo = 1;
query->nan_hi = 0; query->nan_lo = 0;
query->nns_hi = 0; query->nns_lo = 0;
query->nar_hi = 0; query->nar_lo = 0;
p += sizeof(ngx_resolver_hdr_t) + nlen;
qs = (ngx_resolver_qs_t *) p;
qs->type_hi = 0; qs->type_lo = NGX_RESOLVE_A;
qs->class_hi = 0; qs->class_lo = 1;
len = 0;
p--;
*p-- = '\0';
if (ctx->name.len == 0) {
return NGX_DECLINED;
}
for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) {
if (*s != '.') {
*p = *s;
len++;
} else {
if (len == 0 || len > 255) {
return NGX_DECLINED;
}
*p = (u_char) len;
len = 0;
}
p--;
}
if (len == 0 || len > 255) {
return NGX_DECLINED;
}
*p = (u_char) len;
#if (NGX_HAVE_INET6)
if (!r->ipv6) {
return NGX_OK;
}
p = rn->query6;
ngx_memcpy(p, rn->query, rn->qlen);
query = (ngx_resolver_hdr_t *) p;
ident = ngx_random();
ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0,
"resolve: \"%V\" AAAA %i", &ctx->name, ident & 0xffff);
query->ident_hi = (u_char) ((ident >> 8) & 0xff);
query->ident_lo = (u_char) (ident & 0xff);
p += sizeof(ngx_resolver_hdr_t) + nlen;
qs = (ngx_resolver_qs_t *) p;
qs->type_lo = NGX_RESOLVE_AAAA;
#endif
return NGX_OK;
}
static ngx_int_t
ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx)
{
u_char *p, *d;
size_t len;
in_addr_t addr;
ngx_int_t n;
ngx_uint_t ident;
ngx_resolver_hdr_t *query;
struct sockaddr_in *sin;
#if (NGX_HAVE_INET6)
struct sockaddr_in6 *sin6;
#endif
switch (ctx->addr.sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
len = sizeof(ngx_resolver_hdr_t)
+ 64 + sizeof(".ip6.arpa.") - 1
+ sizeof(ngx_resolver_qs_t);
break;
#endif
default:
len = sizeof(ngx_resolver_hdr_t)
+ sizeof(".255.255.255.255.in-addr.arpa.") - 1
+ sizeof(ngx_resolver_qs_t);
}
p = ngx_resolver_alloc(ctx->resolver, len);
if (p == NULL) {
return NGX_ERROR;
}
rn->query = p;
query = (ngx_resolver_hdr_t *) p;
ident = ngx_random();
query->ident_hi = (u_char) ((ident >> 8) & 0xff);
query->ident_lo = (u_char) (ident & 0xff);
query->flags_hi = 1; query->flags_lo = 0;
query->nqs_hi = 0; query->nqs_lo = 1;
query->nan_hi = 0; query->nan_lo = 0;
query->nns_hi = 0; query->nns_lo = 0;
query->nar_hi = 0; query->nar_lo = 0;
p += sizeof(ngx_resolver_hdr_t);
switch (ctx->addr.sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
sin6 = (struct sockaddr_in6 *) ctx->addr.sockaddr;
for (n = 15; n >= 0; n--) {
p = ngx_sprintf(p, "\1%xd\1%xd",
sin6->sin6_addr.s6_addr[n] & 0xf,
(sin6->sin6_addr.s6_addr[n] >> 4) & 0xf);
}
p = ngx_cpymem(p, "\3ip6\4arpa\0", 10);
break;
#endif
default:
sin = (struct sockaddr_in *) ctx->addr.sockaddr;
addr = ntohl(sin->sin_addr.s_addr);
for (n = 0; n < 32; n += 8) {
d = ngx_sprintf(&p[1], "%ud", (addr >> n) & 0xff);
*p = (u_char) (d - &p[1]);
p = d;
}
p = ngx_cpymem(p, "\7in-addr\4arpa\0", 14);
}
p = ngx_cpymem(p, "\0\14\0\1", 4);
rn->qlen = (u_short) (p - rn->query);
return NGX_OK;
}
static ngx_int_t
ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src,
u_char *last)
{
char *err;
u_char *p, *dst;
ssize_t len;
ngx_uint_t i, n;
p = src;
len = -1;
for (i = 0; i < 128; i++) {
n = *p++;
if (n == 0) {
goto done;
}
if (n & 0xc0) {
n = ((n & 0x3f) << 8) + *p;
p = &buf[n];
} else {
len += 1 + n;
p = &p[n];
}
if (p >= last) {
err = "name is out of response";
goto invalid;
}
}
err = "compression pointers loop";
invalid:
ngx_log_error(r->log_level, r->log, 0, err);
return NGX_ERROR;
done:
if (name == NULL) {
return NGX_OK;
}
if (len == -1) {
ngx_str_null(name);
return NGX_OK;
}
dst = ngx_resolver_alloc(r, len);
if (dst == NULL) {
return NGX_ERROR;
}
name->data = dst;
n = *src++;
for ( ;; ) {
if (n & 0xc0) {
n = ((n & 0x3f) << 8) + *src;
src = &buf[n];
n = *src++;
} else {
ngx_strlow(dst, src, n);
dst += n;
src += n;
n = *src++;
if (n != 0) {
*dst++ = '.';
}
}
if (n == 0) {
name->len = dst - name->data;
return NGX_OK;
}
}
}
static void
ngx_resolver_timeout_handler(ngx_event_t *ev)
{
ngx_resolver_ctx_t *ctx, *next;
ngx_resolver_node_t *rn;
rn = ev->data;
ctx = rn->waiting;
rn->waiting = NULL;
do {
ctx->state = NGX_RESOLVE_TIMEDOUT;
next = ctx->next;
ctx->handler(ctx);
ctx = next;
} while (ctx);
}
static void
ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn)
{
if (rn->query) {
ngx_resolver_free_locked(r, rn->query);
}
if (rn->name) {
ngx_resolver_free_locked(r, rn->name);
}
if (rn->cnlen) {
ngx_resolver_free_locked(r, rn->u.cname);
}
if (rn->naddrs > 1 && rn->naddrs != (u_short) -1) {
ngx_resolver_free_locked(r, rn->u.addrs);
}
#if (NGX_HAVE_INET6)
if (rn->naddrs6 > 1 && rn->naddrs6 != (u_short) -1) {
ngx_resolver_free_locked(r, rn->u6.addrs6);
}
#endif
ngx_resolver_free_locked(r, rn);
}
static void *
ngx_resolver_alloc(ngx_resolver_t *r, size_t size)
{
u_char *p;
p = ngx_alloc(size, r->log);
return p;
}
static void *
ngx_resolver_calloc(ngx_resolver_t *r, size_t size)
{
u_char *p;
p = ngx_resolver_alloc(r, size);
if (p) {
ngx_memzero(p, size);
}
return p;
}
static void
ngx_resolver_free(ngx_resolver_t *r, void *p)
{
ngx_free(p);
}
static void
ngx_resolver_free_locked(ngx_resolver_t *r, void *p)
{
ngx_free(p);
}
static void *
ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size)
{
void *dst;
dst = ngx_resolver_alloc(r, size);
if (dst == NULL) {
return dst;
}
ngx_memcpy(dst, src, size);
return dst;
}
static ngx_addr_t *
ngx_resolver_export(ngx_resolver_t *r, ngx_resolver_node_t *rn,
ngx_uint_t rotate)
{
ngx_addr_t *dst;
ngx_uint_t d, i, j, n;
u_char (*sockaddr)[NGX_SOCKADDRLEN];
in_addr_t *addr;
struct sockaddr_in *sin;
#if (NGX_HAVE_INET6)
struct in6_addr *addr6;
struct sockaddr_in6 *sin6;
#endif
n = rn->naddrs;
#if (NGX_HAVE_INET6)
n += rn->naddrs6;
#endif
dst = ngx_resolver_calloc(r, n * sizeof(ngx_addr_t));
if (dst == NULL) {
return NULL;
}
sockaddr = ngx_resolver_calloc(r, n * NGX_SOCKADDRLEN);
if (sockaddr == NULL) {
ngx_resolver_free(r, dst);
return NULL;
}
i = 0;
d = rotate ? ngx_random() % n : 0;
if (rn->naddrs) {
j = rotate ? ngx_random() % rn->naddrs : 0;
addr = (rn->naddrs == 1) ? &rn->u.addr : rn->u.addrs;
do {
sin = (struct sockaddr_in *) sockaddr[d];
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = addr[j++];
dst[d].sockaddr = (struct sockaddr *) sin;
dst[d++].socklen = sizeof(struct sockaddr_in);
if (d == n) {
d = 0;
}
if (j == rn->naddrs) {
j = 0;
}
} while (++i < rn->naddrs);
}
#if (NGX_HAVE_INET6)
if (rn->naddrs6) {
j = rotate ? ngx_random() % rn->naddrs6 : 0;
addr6 = (rn->naddrs6 == 1) ? &rn->u6.addr6 : rn->u6.addrs6;
do {
sin6 = (struct sockaddr_in6 *) sockaddr[d];
sin6->sin6_family = AF_INET6;
ngx_memcpy(sin6->sin6_addr.s6_addr, addr6[j++].s6_addr, 16);
dst[d].sockaddr = (struct sockaddr *) sin6;
dst[d++].socklen = sizeof(struct sockaddr_in6);
if (d == n) {
d = 0;
}
if (j == rn->naddrs6) {
j = 0;
}
} while (++i < n);
}
#endif
return dst;
}
char *
ngx_resolver_strerror(ngx_int_t err)
{
static char *errors[] = {
"Format error",
"Server failure",
"Host not found",
"Unimplemented",
"Operation refused"
};
if (err > 0 && err < 6) {
return errors[err - 1];
}
if (err == NGX_RESOLVE_TIMEDOUT) {
return "Operation timed out";
}
return "Unknown error";
}
static u_char *
ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len)
{
u_char *p;
ngx_udp_connection_t *uc;
p = buf;
if (log->action) {
p = ngx_snprintf(buf, len, " while %s", log->action);
len -= p - buf;
}
uc = log->data;
if (uc) {
p = ngx_snprintf(p, len, ", resolver: %V", &uc->server);
}
return p;
}
ngx_int_t
ngx_udp_connect(ngx_udp_connection_t *uc)
{
int rc;
ngx_int_t event;
ngx_event_t *rev, *wev;
ngx_socket_t s;
ngx_connection_t *c;
s = ngx_socket(uc->sockaddr->sa_family, SOCK_DGRAM, 0);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s);
if (s == (ngx_socket_t) -1) {
ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno,
ngx_socket_n " failed");
return NGX_ERROR;
}
c = ngx_get_connection(s, &uc->log);
if (c == NULL) {
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno,
ngx_close_socket_n "failed");
}
return NGX_ERROR;
}
if (ngx_nonblocking(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno,
ngx_nonblocking_n " failed");
goto failed;
}
rev = c->read;
wev = c->write;
rev->log = &uc->log;
wev->log = &uc->log;
uc->connection = c;
c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0,
"connect to %V, fd:%d #%uA", &uc->server, s, c->number);
rc = connect(s, uc->sockaddr, uc->socklen);
if (rc == -1) {
ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno,
"connect() failed");
goto failed;
}
wev->ready = 1;
event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ?
NGX_CLEAR_EVENT:
NGX_LEVEL_EVENT;
if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
goto failed;
}
return NGX_OK;
failed:
ngx_close_connection(c);
uc->connection = NULL;
return NGX_ERROR;
}