new file mode 100644
--- /dev/null
+++ b/src/imap/ngx_imap_core_module.c
@@ -0,0 +1,455 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+#include <ngx_imap.h>
+
+
+static void *ngx_imap_core_create_main_conf(ngx_conf_t *cf);
+static void *ngx_imap_core_create_srv_conf(ngx_conf_t *cf);
+static char *ngx_imap_core_merge_srv_conf(ngx_conf_t *cf, void *parent,
+    void *child);
+static char *ngx_imap_core_server(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
+static char *ngx_imap_core_listen(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
+static char *ngx_imap_core_capability(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
+
+
+static ngx_conf_enum_t  ngx_imap_core_procotol[] = {
+    { ngx_string("pop3"), NGX_IMAP_POP3_PROTOCOL },
+    { ngx_string("imap"), NGX_IMAP_IMAP_PROTOCOL },
+    { ngx_null_string, 0 }
+};
+
+
+static ngx_str_t  ngx_pop3_default_capabilities[] = {
+    ngx_string("TOP"),
+    ngx_string("USER"),
+    ngx_string("UIDL"),
+    ngx_null_string
+};
+
+
+static ngx_str_t  ngx_imap_default_capabilities[] = {
+    ngx_string("IMAP4"),
+    ngx_string("IMAP4rev1"),
+    ngx_string("UIDPLUS"),
+    ngx_null_string
+};
+
+
+static ngx_command_t  ngx_imap_core_commands[] = {
+
+    { ngx_string("server"),
+      NGX_IMAP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS,
+      ngx_imap_core_server,
+      0,
+      0,
+      NULL },
+
+    { ngx_string("listen"),
+      NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_imap_core_listen,
+      0,
+      0,
+      NULL },
+
+    { ngx_string("protocol"),
+      NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_enum_slot,
+      NGX_IMAP_SRV_CONF_OFFSET,
+      offsetof(ngx_imap_core_srv_conf_t, protocol),
+      &ngx_imap_core_procotol },
+
+    { ngx_string("imap_client_buffer"),
+      NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      NGX_IMAP_SRV_CONF_OFFSET,
+      offsetof(ngx_imap_core_srv_conf_t, imap_client_buffer_size),
+      NULL },
+
+    { ngx_string("proxy_buffer"),
+      NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      NGX_IMAP_SRV_CONF_OFFSET,
+      offsetof(ngx_imap_core_srv_conf_t, proxy_buffer_size),
+      NULL },
+
+    { ngx_string("timeout"),
+      NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_msec_slot,
+      NGX_IMAP_SRV_CONF_OFFSET,
+      offsetof(ngx_imap_core_srv_conf_t, timeout),
+      NULL },
+
+    { ngx_string("pop3_capabilities"),
+      NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_1MORE,
+      ngx_imap_core_capability,
+      NGX_IMAP_SRV_CONF_OFFSET,
+      offsetof(ngx_imap_core_srv_conf_t, pop3_capabilities),
+      NULL },
+
+    { ngx_string("imap_capabilities"),
+      NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_1MORE,
+      ngx_imap_core_capability,
+      NGX_IMAP_SRV_CONF_OFFSET,
+      offsetof(ngx_imap_core_srv_conf_t, imap_capabilities),
+      NULL },
+
+      ngx_null_command
+};
+
+
+static ngx_imap_module_t  ngx_imap_core_module_ctx = {
+    ngx_imap_core_create_main_conf,        /* create main configuration */
+    NULL,                                  /* init main configuration */
+
+    ngx_imap_core_create_srv_conf,         /* create server configuration */
+    ngx_imap_core_merge_srv_conf           /* merge server configuration */
+};
+
+
+ngx_module_t  ngx_imap_core_module = {
+    NGX_MODULE_V1,
+    &ngx_imap_core_module_ctx,             /* module context */
+    ngx_imap_core_commands,                /* module directives */
+    NGX_IMAP_MODULE,                       /* module type */
+    NULL,                                  /* init module */
+    NULL                                   /* init process */
+};
+
+
+static void *
+ngx_imap_core_create_main_conf(ngx_conf_t *cf)
+{           
+    ngx_imap_core_main_conf_t  *cmcf;
+
+    cmcf = ngx_pcalloc(cf->pool, sizeof(ngx_imap_core_main_conf_t));
+    if (cmcf == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    if (ngx_array_init(&cmcf->servers, cf->pool, 4,
+                       sizeof(ngx_imap_core_srv_conf_t *)) == NGX_ERROR)
+    {
+        return NGX_CONF_ERROR;
+    }
+
+    return cmcf;
+}
+
+
+static void *
+ngx_imap_core_create_srv_conf(ngx_conf_t *cf)
+{           
+    ngx_imap_core_srv_conf_t  *cscf;
+            
+    cscf = ngx_pcalloc(cf->pool, sizeof(ngx_imap_core_srv_conf_t));
+    if (cscf == NULL) {
+        return NULL;
+    }
+
+    cscf->imap_client_buffer_size = NGX_CONF_UNSET_SIZE;
+    cscf->proxy_buffer_size = NGX_CONF_UNSET_SIZE;
+    cscf->timeout = NGX_CONF_UNSET_MSEC;
+    cscf->protocol = NGX_CONF_UNSET_UINT;
+
+    if (ngx_array_init(&cscf->pop3_capabilities, cf->pool, 4, sizeof(ngx_str_t))
+        != NGX_OK)
+    {
+        return NULL;
+    }
+
+    if (ngx_array_init(&cscf->imap_capabilities, cf->pool, 4, sizeof(ngx_str_t))
+        != NGX_OK)
+    {
+        return NULL;
+    }
+
+    return cscf;
+}
+
+
+static char *
+ngx_imap_core_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
+{
+    ngx_imap_core_srv_conf_t *prev = parent;
+    ngx_imap_core_srv_conf_t *conf = child;
+
+    size_t       size;
+    ngx_buf_t   *b;
+    ngx_str_t   *c, *d;
+    ngx_uint_t   i;
+
+    ngx_conf_merge_size_value(conf->imap_client_buffer_size,
+                              prev->imap_client_buffer_size,
+                              (size_t) ngx_pagesize);
+    ngx_conf_merge_size_value(conf->proxy_buffer_size, prev->proxy_buffer_size,
+                              (size_t) ngx_pagesize);
+    ngx_conf_merge_msec_value(conf->timeout, prev->timeout, 60000);
+    ngx_conf_merge_unsigned_value(conf->protocol, prev->protocol,
+                              NGX_IMAP_IMAP_PROTOCOL);
+
+
+    if (conf->pop3_capabilities.nelts == 0) {
+        conf->pop3_capabilities = prev->pop3_capabilities;
+    }
+
+    if (conf->pop3_capabilities.nelts == 0) {
+
+        for (d = ngx_pop3_default_capabilities; d->len; d++) {
+            c = ngx_array_push(&conf->pop3_capabilities);
+            if (c == NULL) {
+                return NGX_CONF_ERROR;
+            }
+
+            *c = *d;
+        }
+    }
+
+    size = sizeof("+OK Capability list follows" CRLF) - 1
+           + sizeof("." CRLF) - 1;
+
+    c = conf->pop3_capabilities.elts;
+    for (i = 0; i < conf->pop3_capabilities.nelts; i++) {
+        size += c[i].len + sizeof(CRLF) - 1;
+    }
+
+    b = ngx_create_temp_buf(cf->pool, size);
+    if (b == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    b->last = ngx_cpymem(b->last, "+OK Capability list follows" CRLF,
+                         sizeof("+OK Capability list follows" CRLF) - 1);
+
+    for (i = 0; i < conf->pop3_capabilities.nelts; i++) {
+        b->last = ngx_cpymem(b->last, c[i].data, c[i].len);
+        *b->last++ = CR; *b->last++ = LF;
+    }
+
+    *b->last++ = '.'; *b->last++ = CR; *b->last++ = LF;
+
+    conf->pop3_capability = b;
+
+
+    if (conf->imap_capabilities.nelts == 0) {
+        conf->imap_capabilities = prev->imap_capabilities;
+    }
+
+    if (conf->imap_capabilities.nelts == 0) {
+
+        for (d = ngx_imap_default_capabilities; d->len; d++) {
+            c = ngx_array_push(&conf->imap_capabilities);
+            if (c == NULL) {
+                return NGX_CONF_ERROR;
+            }
+
+            *c = *d;
+        }
+    }
+
+    size = sizeof("* CAPABILITY") - 1 + sizeof(CRLF) - 1;
+
+    c = conf->imap_capabilities.elts;
+    for (i = 0; i < conf->imap_capabilities.nelts; i++) {
+        size += 1 + c[i].len;
+    }
+
+    b = ngx_create_temp_buf(cf->pool, size);
+    if (b == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    b->last = ngx_cpymem(b->last, "* CAPABILITY", sizeof("* CAPABILITY") - 1);
+
+    for (i = 0; i < conf->imap_capabilities.nelts; i++) {
+        *b->last++ = ' ';
+        b->last = ngx_cpymem(b->last, c[i].data, c[i].len);
+    }
+
+    *b->last++ = CR; *b->last++ = LF;
+
+    conf->imap_capability = b;
+
+    return NGX_CONF_OK;
+}
+
+
+static char *
+ngx_imap_core_server(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    char                       *rv;
+    void                       *mconf;
+    ngx_uint_t                  m;
+    ngx_conf_t                  pcf;
+    ngx_imap_module_t          *module;
+    ngx_imap_conf_ctx_t        *ctx, *imap_ctx;
+    ngx_imap_core_srv_conf_t   *cscf, **cscfp;
+    ngx_imap_core_main_conf_t  *cmcf;
+
+
+    ctx = ngx_pcalloc(cf->pool, sizeof(ngx_imap_conf_ctx_t));
+    if (ctx == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    imap_ctx = cf->ctx;
+    ctx->main_conf = imap_ctx->main_conf;
+    
+    /* the server{}'s srv_conf */
+
+    ctx->srv_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_imap_max_module);
+    if (ctx->srv_conf == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    for (m = 0; ngx_modules[m]; m++) {
+        if (ngx_modules[m]->type != NGX_IMAP_MODULE) {
+            continue;
+        }
+
+        module = ngx_modules[m]->ctx;
+
+        if (module->create_srv_conf) {
+            mconf = module->create_srv_conf(cf);
+            if (mconf == NULL) {
+                return NGX_CONF_ERROR;
+            }
+
+            ctx->srv_conf[ngx_modules[m]->ctx_index] = mconf;
+        }
+    }
+
+    /* the server configuration context */
+
+    cscf = ctx->srv_conf[ngx_imap_core_module.ctx_index];
+    cscf->ctx = ctx;
+
+    cmcf = ctx->main_conf[ngx_imap_core_module.ctx_index];
+
+    cscfp = ngx_array_push(&cmcf->servers);
+    if (cscfp == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    *cscfp = cscf;
+
+
+    /* parse inside server{} */
+
+    pcf = *cf;
+    cf->ctx = ctx;
+    cf->cmd_type = NGX_IMAP_SRV_CONF;
+
+    rv = ngx_conf_parse(cf, NULL);
+
+    *cf = pcf;
+
+    return rv;
+}
+
+
+/* AF_INET only */
+
+static char *
+ngx_imap_core_listen(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    char                 *err;
+    ngx_str_t            *value;
+    in_addr_t             in_addr;
+    struct hostent       *h;
+    ngx_listening_t      *ls;
+    ngx_inet_upstream_t   inet_upstream;
+
+    value = cf->args->elts;
+
+    ngx_memzero(&inet_upstream, sizeof(ngx_inet_upstream_t));
+
+    inet_upstream.url = value[1];
+    inet_upstream.port_only = 1;
+
+    err = ngx_inet_parse_host_port(&inet_upstream);
+
+    if (err) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "%s in \"%V\" of the \"listen\" directive",
+                           err, &inet_upstream.url);
+        return NGX_CONF_ERROR;
+    }
+
+    if (inet_upstream.host.len) {
+        inet_upstream.host.data[inet_upstream.host.len] = '\0';
+
+        in_addr = inet_addr((const char *) inet_upstream.host.data);
+
+        if (in_addr == INADDR_NONE) {
+            h = gethostbyname((const char *) inet_upstream.host.data);
+    
+            if (h == NULL || h->h_addr_list[0] == NULL) {
+                ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                                   "can not resolve host \"%s\" "
+                                   "in the \"listen\" directive",
+                                   inet_upstream.host.data);
+                return NGX_CONF_ERROR;
+            }
+
+            in_addr = *(in_addr_t *)(h->h_addr_list[0]);
+        }
+
+    } else {
+        in_addr = INADDR_ANY;
+    }
+
+
+    ls = ngx_listening_inet_stream_socket(cf, in_addr, inet_upstream.port);
+    if (ls == NULL) {
+        return NGX_CONF_ERROR; 
+    }
+
+    ls->backlog = -1;
+    ls->addr_ntop = 1;
+    ls->handler = ngx_imap_init_connection;
+    ls->pool_size = 256;
+
+    ls->ctx = cf->ctx;
+
+    /* STUB */
+    ls->log = cf->cycle->new_log;
+    /**/
+
+    return NGX_CONF_OK;
+}
+
+
+static char *
+ngx_imap_core_capability(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    char  *p = conf;
+
+    ngx_str_t    *c, *value;
+    ngx_uint_t    i;
+    ngx_array_t  *a;
+
+    a = (ngx_array_t *) (p + cmd->offset);
+
+    value = cf->args->elts;
+
+    for (i = 1; i < cf->args->nelts; i++) {
+        c = ngx_array_push(a);
+        if (c == NULL) {
+            return NGX_CONF_ERROR;
+        }
+
+        *c = value[i];
+    }
+
+    return NGX_CONF_OK;
+}