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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_imap.h>
#include <nginx.h>
static void ngx_imap_init_session(ngx_event_t *rev);
static void ngx_pop3_auth_state(ngx_event_t *rev);
static ngx_int_t ngx_pop3_read_command(ngx_imap_session_t *s);
static u_char pop3_greeting[] = "+OK " NGINX_VER " ready" CRLF;
static u_char imap_greeting[] = "* OK " NGINX_VER " ready" CRLF;
static u_char pop3_ok[] = "+OK" CRLF;
static u_char pop3_invalid_command[] = "-ERR invalid command" CRLF;
void ngx_imap_init_connection(ngx_connection_t *c)
{
u_char *greeting;
ssize_t size;
ngx_log_debug0(NGX_LOG_DEBUG_IMAP, c->log, 0,
"imap init connection");
c->log_error = NGX_ERROR_INFO;
greeting = pop3_greeting;
size = sizeof(pop3_greeting) - 1;
if (ngx_send(c, greeting, size) < size) {
/*
* we treat the incomplete sending as NGX_ERROR
* because it is very strange here
*/
ngx_imap_close_connection(c);
return;
}
c->read->event_handler = ngx_imap_init_session;
ngx_add_timer(c->read, /* STUB */ 60000);
if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
ngx_imap_close_connection(c);
}
}
static void ngx_imap_init_session(ngx_event_t *rev)
{
size_t size;
ngx_connection_t *c;
ngx_imap_session_t *s;
c = rev->data;
/* TODO: timeout */
if (!(s = ngx_pcalloc(c->pool, sizeof(ngx_imap_session_t)))) {
ngx_imap_close_connection(c);
return;
}
c->data = s;
s->connection = c;
if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) == NGX_ERROR) {
ngx_imap_close_connection(s->connection);
return;
}
size = /* STUB: pop3: 128, imap: configurable 4K default */ 128;
s->buffer = ngx_create_temp_buf(s->connection->pool, size);
if (s->buffer == NULL) {
ngx_imap_close_connection(s->connection);
return;
}
ngx_pop3_auth_state(rev);
}
static void ngx_pop3_auth_state(ngx_event_t *rev)
{
u_char *text;
ssize_t size;
ngx_int_t rc;
ngx_connection_t *c;
ngx_imap_session_t *s;
c = rev->data;
s = c->data;
/* TODO: timeout */
rc = ngx_pop3_read_command(s);
if (rc == NGX_AGAIN || rc == NGX_ERROR) {
return;
}
s->state = 0;
if (rc == NGX_IMAP_PARSE_INVALID_COMMAND) {
text = pop3_invalid_command;
size = sizeof(pop3_invalid_command) - 1;
} else {
text = pop3_ok;
size = sizeof(pop3_ok) - 1;
}
if (ngx_send(c, text, size) < size) {
/*
* we treat the incomplete sending as NGX_ERROR
* because it is very strange here
*/
ngx_imap_close_connection(c);
return;
}
}
static ngx_int_t ngx_pop3_read_command(ngx_imap_session_t *s)
{
ssize_t n;
ngx_int_t rc;
n = ngx_recv(s->connection, s->buffer->last,
s->buffer->end - s->buffer->last);
if (n == NGX_ERROR || n == 0) {
ngx_imap_close_connection(s->connection);
return NGX_ERROR;
}
if (n > 0) {
s->buffer->last += n;
}
if (n == NGX_AGAIN) {
if (ngx_handle_read_event(s->connection->read, 0) == NGX_ERROR) {
ngx_imap_close_connection(s->connection);
return NGX_ERROR;
}
return NGX_AGAIN;
}
rc = ngx_pop3_parse_command(s);
if (rc == NGX_AGAIN || rc == NGX_IMAP_PARSE_INVALID_COMMAND) {
return rc;
}
if (rc == NGX_ERROR) {
ngx_imap_close_connection(s->connection);
return NGX_ERROR;
}
return NGX_OK;
}
#if 0
void ngx_imap_close_session(ngx_imap_session_t *s)
{
ngx_log_debug0(NGX_LOG_DEBUG_IMAP, s->connection->log, 0,
"close imap session");
ngx_imap_close_connection(s->connection);
}
#endif
void ngx_imap_close_connection(ngx_connection_t *c)
{
ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0,
"close imap connection: %d", c->fd);
ngx_close_connection(c);
}
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