nginx/src/imap/ngx_imap_proxy.c

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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_event_connect.h>
#include <ngx_imap.h>
static void ngx_imap_proxy_block_read(ngx_event_t *rev);
static void ngx_imap_proxy_auth_handler(ngx_event_t *rev);
static void ngx_imap_proxy_init_handler(ngx_event_t *wev);
static void ngx_imap_proxy_dummy_handler(ngx_event_t *ev);
static ngx_int_t ngx_imap_proxy_read_response(ngx_imap_session_t *s);
static void ngx_imap_proxy_handler(ngx_event_t *ev);
static void ngx_imap_proxy_close_session(ngx_imap_session_t *s);
void ngx_imap_proxy_init(ngx_imap_session_t *s)
{
ngx_int_t rc;
ngx_peers_t *peers;
ngx_imap_proxy_ctx_t *p;
if (!(p = ngx_pcalloc(s->connection->pool, sizeof(ngx_imap_proxy_ctx_t)))) {
ngx_imap_close_connection(s->connection);
return;
}
s->proxy = p;
/**/
if (!(peers = ngx_pcalloc(s->connection->pool, sizeof(ngx_peers_t)))) {
ngx_imap_close_connection(s->connection);
return;
}
p->upstream.peers = peers;
p->upstream.log = s->connection->log;
p->upstream.log_error = NGX_ERROR_ERR;
peers->number = 1;
peers->max_fails = 1;
#if 0
peers->peers[0].addr = inet_addr("81.19.69.70");
peers->peers[0].addr_port_text.len = sizeof("81.19.69.70:110") - 1;
peers->peers[0].addr_port_text.data = (u_char *) "81.19.69.70:110";
peers->peers[0].port = htons(110);
#else
peers->peers[0].addr = inet_addr("81.19.64.101");
peers->peers[0].addr_port_text.len = sizeof("81.19.64.101:110") - 1;
peers->peers[0].addr_port_text.data = (u_char *) "81.19.64.101:110";
peers->peers[0].port = htons(110);
#endif
rc = ngx_event_connect_peer(&p->upstream);
if (rc == NGX_ERROR) {
ngx_imap_proxy_close_session(s);
return;
}
p->upstream.connection->data = s;
p->upstream.connection->pool = s->connection->pool;
s->connection->read->event_handler = ngx_imap_proxy_block_read;
p->upstream.connection->read->event_handler = ngx_imap_proxy_auth_handler;
p->upstream.connection->write->event_handler = ngx_imap_proxy_dummy_handler;
}
static void ngx_imap_proxy_block_read(ngx_event_t *rev)
{
ngx_connection_t *c;
ngx_imap_session_t *s;
ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy block read");
if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
c = rev->data;
s = c->data;
ngx_imap_proxy_close_session(s);
}
}
static void ngx_imap_proxy_auth_handler(ngx_event_t *rev)
{
u_char *p;
ngx_int_t rc;
ngx_str_t line;
ngx_connection_t *c;
ngx_imap_session_t *s;
ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy auth handler");
c = rev->data;
s = c->data;
if (rev->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
ngx_imap_proxy_close_session(s);
return;
}
if (s->proxy->buffer == NULL) {
s->proxy->buffer = ngx_create_temp_buf(c->pool, /* STUB */ 4096);
if (s->proxy->buffer == NULL) {
ngx_imap_proxy_close_session(s);
return;
}
}
rc = ngx_imap_proxy_read_response(s);
if (rc == NGX_AGAIN) {
return;
}
if (rc == NGX_ERROR) {
/* TODO: ngx_imap_proxy_finalize_session(s, NGX_IMAP_INTERNAL_ERROR) */
ngx_imap_proxy_close_session(s);
return;
}
if (s->imap_state == ngx_pop3_start) {
ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy send user");
line.len = sizeof("USER ") + s->login.len - 1 + 2;
if (!(line.data = ngx_palloc(c->pool, line.len))) {
ngx_imap_proxy_close_session(s);
return;
}
p = ngx_cpymem(line.data, "USER ", sizeof("USER ") - 1);
p = ngx_cpymem(p, s->login.data, s->login.len);
*p++ = CR; *p++ = LF;
if (ngx_send(c, line.data, line.len) < (ssize_t) line.len) {
/*
* we treat the incomplete sending as NGX_ERROR
* because it is very strange here
*/
ngx_imap_close_connection(c);
return;
}
s->imap_state = ngx_pop3_user;
s->proxy->buffer->pos = s->proxy->buffer->start;
s->proxy->buffer->last = s->proxy->buffer->start;
return;
}
ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy send pass");
line.len = sizeof("PASS ") + s->passwd.len - 1 + 2;
if (!(line.data = ngx_palloc(c->pool, line.len))) {
ngx_imap_proxy_close_session(s);
return;
}
p = ngx_cpymem(line.data, "PASS ", sizeof("PASS ") - 1);
p = ngx_cpymem(p, s->passwd.data, s->passwd.len);
*p++ = CR; *p++ = LF;
if (ngx_send(c, line.data, line.len) < (ssize_t) line.len) {
/*
* we treat the incomplete sending as NGX_ERROR
* because it is very strange here
*/
ngx_imap_close_connection(c);
return;
}
s->proxy->buffer->pos = s->proxy->buffer->start;
s->proxy->buffer->last = s->proxy->buffer->start;
s->connection->read->event_handler = ngx_imap_proxy_handler;
s->connection->write->event_handler = ngx_imap_proxy_handler;
rev->event_handler = ngx_imap_proxy_handler;
c->write->event_handler = ngx_imap_proxy_handler;
}
static void ngx_imap_proxy_dummy_handler(ngx_event_t *ev)
{
ngx_log_debug0(NGX_LOG_DEBUG_IMAP, ev->log, 0, "imap proxy dummy handler");
}
static ngx_int_t ngx_imap_proxy_read_response(ngx_imap_session_t *s)
{
u_char *p;
ssize_t n;
ngx_buf_t *b;
b = s->proxy->buffer;
n = ngx_recv(s->proxy->upstream.connection, b->last, b->end - b->last);
if (n == NGX_ERROR || n == 0) {
return NGX_ERROR;
}
if (n == NGX_AGAIN) {
return NGX_AGAIN;
}
b->last += n;
if (b->last - b->pos < 5) {
return NGX_AGAIN;
}
if (*(b->last - 2) != CR || *(b->last - 1) != LF) {
if (b->last == b->end) {
*(b->last - 1) = '\0';
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"upstream sent too long response line: \"%s\"",
b->pos);
return NGX_IMAP_PROXY_INVALID;
}
return NGX_AGAIN;
}
p = b->pos;
if (p[0] == '+' && p[1] == 'O' && p[2] == 'K') {
return NGX_OK;
}
if (p[0] == '-' && p[1] == 'E' && p[2] == 'R' && p[3] == 'R') {
return NGX_IMAP_PROXY_ERROR;
}
*(b->last - 2) = '\0';
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"upstream sent invalid greeting line: \"%s\"", p);
return NGX_IMAP_PROXY_INVALID;
}
static void ngx_imap_proxy_handler(ngx_event_t *ev)
{
size_t size;
ssize_t n;
ngx_buf_t *b;
ngx_uint_t again, do_write;
ngx_connection_t *c, *src, *dst;
ngx_imap_session_t *s;
c = ev->data;
s = c->data;
if (ev->timedout) {
if (c == s->connection) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
"client timed out");
} else {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
"upstream timed out");
}
ngx_imap_proxy_close_session(s);
return;
}
if (c == s->connection) {
if (ev->write) {
src = s->proxy->upstream.connection;
dst = c;
b = s->proxy->buffer;
} else {
src = c;
dst = s->proxy->upstream.connection;
b = s->buffer;
}
} else {
if (ev->write) {
src = s->connection;
dst = c;
b = s->buffer;
} else {
src = c;
dst = s->connection;
b = s->proxy->buffer;
}
}
do_write = ev->write ? 1 : 0;
ngx_log_debug3(NGX_LOG_DEBUG_IMAP, ev->log, 0,
"imap proxy handler: %d, #%d > #%d",
do_write, src->fd, dst->fd);
do {
again = 0;
if (do_write == 1) {
size = b->last - b->pos;
if (size && dst->write->ready) {
n = ngx_send(dst, b->pos, size);
if (n == NGX_ERROR) {
ngx_imap_proxy_close_session(s);
return;
}
if (n > 0) {
again = 1;
b->pos += n;
if (b->pos == b->last) {
b->pos = b->start;
b->last = b->start;
}
}
if (n == NGX_AGAIN || n < (ssize_t) size) {
dst->write->available = 0;
if (ngx_handle_write_event(dst->write, NGX_LOWAT_EVENT)
== NGX_ERROR)
{
ngx_imap_proxy_close_session(s);
return;
}
}
}
}
size = b->end - b->last;
if (size && src->read->ready) {
n = ngx_recv(src, b->last, size);
if (n == NGX_ERROR || n == 0) {
ngx_imap_proxy_close_session(s);
return;
}
if (n > 0) {
again = 1;
do_write = 1;
b->last += n;
}
if (n == NGX_AGAIN || n < (ssize_t) size) {
if (ngx_handle_read_event(src->read, 0) == NGX_ERROR) {
ngx_imap_proxy_close_session(s);
return;
}
}
}
} while (again);
}
static void ngx_imap_proxy_close_session(ngx_imap_session_t *s)
{
if (ngx_close_socket(s->proxy->upstream.connection->fd) == -1) {
ngx_log_error(NGX_LOG_ALERT, s->connection->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
ngx_imap_close_connection(s->connection);
}