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/*
* Copyright (C) Igor Sysoev
*/
#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;
if (rev->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
ngx_imap_close_connection(c);
return;
}
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(c);
return;
}
size = /* STUB: pop3: 128, imap: configurable 4K default */ 128;
s->buffer = ngx_create_temp_buf(c->pool, size);
if (s->buffer == NULL) {
ngx_imap_close_connection(c);
return;
}
c->read->event_handler = ngx_pop3_auth_state;
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_uint_t quit;
ngx_str_t *arg;
ngx_connection_t *c;
ngx_imap_session_t *s;
c = rev->data;
s = c->data;
ngx_log_debug0(NGX_LOG_DEBUG_IMAP, c->log, 0, "pop3 auth state");
if (rev->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
ngx_imap_close_connection(c);
return;
}
rc = ngx_pop3_read_command(s);
if (rc == NGX_AGAIN || rc == NGX_ERROR) {
return;
}
quit = 0;
text = pop3_ok;
size = sizeof(pop3_ok) - 1;
if (rc == NGX_OK) {
switch (s->imap_state) {
case ngx_pop3_start:
switch (s->command) {
case NGX_POP3_USER:
if (s->args.nelts == 1) {
s->imap_state = ngx_pop3_user;
arg = s->args.elts;
s->login.len = arg[0].len;
s->login.data = ngx_palloc(c->pool, s->login.len + 1);
if (s->login.data == NULL) {
ngx_imap_close_connection(c);
return;
}
ngx_cpystrn(s->login.data, arg[0].data, s->login.len + 1);
ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0,
"pop3 login: \"%s\"", s->login.data);
} else {
rc = NGX_IMAP_PARSE_INVALID_COMMAND;
}
break;
case NGX_POP3_QUIT:
quit = 1;
break;
default:
s->imap_state = ngx_pop3_start;
rc = NGX_IMAP_PARSE_INVALID_COMMAND;
break;
}
break;
case ngx_pop3_user:
switch (s->command) {
case NGX_POP3_PASS:
if (s->args.nelts == 1) {
/* STUB */ s->imap_state = ngx_pop3_start;
arg = s->args.elts;
s->passwd.len = arg[0].len;
s->passwd.data = ngx_palloc(c->pool, s->passwd.len + 1);
if (s->passwd.data == NULL) {
ngx_imap_close_connection(c);
return;
}
ngx_cpystrn(s->passwd.data, arg[0].data, s->passwd.len + 1);
ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0,
"pop3 passwd: \"%s\"", s->passwd.data);
s->buffer->pos = s->buffer->start;
s->buffer->last = s->buffer->start;
ngx_imap_proxy_init(s);
return;
} else {
rc = NGX_IMAP_PARSE_INVALID_COMMAND;
}
break;
case NGX_POP3_QUIT:
quit = 1;
break;
default:
s->imap_state = ngx_pop3_start;
rc = NGX_IMAP_PARSE_INVALID_COMMAND;
break;
}
break;
}
}
if (rc == NGX_IMAP_PARSE_INVALID_COMMAND) {
text = pop3_invalid_command;
size = sizeof(pop3_invalid_command) - 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;
}
if (quit) {
ngx_imap_close_connection(c);
return;
}
s->args.nelts = 0;
s->buffer->pos = s->buffer->start;
s->buffer->last = s->buffer->start;
}
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_pool_t *pool;
ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0,
"close imap connection: %d", c->fd);
pool = c->pool;
ngx_close_connection(c);
ngx_destroy_pool(c->pool);
}
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