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Diffstat (limited to 'src/imap/ngx_imap_proxy.c')
-rw-r--r--src/imap/ngx_imap_proxy.c238
1 files changed, 228 insertions, 10 deletions
diff --git a/src/imap/ngx_imap_proxy.c b/src/imap/ngx_imap_proxy.c
index f856159ff..6a915f701 100644
--- a/src/imap/ngx_imap_proxy.c
+++ b/src/imap/ngx_imap_proxy.c
@@ -2,14 +2,200 @@
#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_greeting_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_handler(ngx_event_t *ev)
+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;
+ 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 = "81.19.69.70:110";
+ peers->peers[0].port = htons(110);
+
+ 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_greeting_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_greeting_handler(ngx_event_t *rev)
+{
+ ngx_int_t rc;
+ ngx_buf_t *b;
+ ngx_connection_t *c;
+ ngx_imap_session_t *s;
+
+ ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
+ "imap proxy greeting handler");
+
+ c = rev->data;
+ s = c->data;
+
+ 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_OK) {
+ 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;
+
+ b = s->proxy->buffer;
+ b->pos = b->start;
+ b->last = b->start;
+
+ if (ngx_handle_read_event(s->connection->read, 0) == NGX_ERROR) {
+ ngx_imap_proxy_close_session(s);
+ return;
+ }
+
+ if (s->connection->read->ready) {
+ ngx_imap_proxy_handler(s->connection->read);
+ }
+
+ return;
+ }
+
+ /* TODO: ngx_imap_proxy_finalize_session(s, NGX_IMAP_INTERNAL_ERROR) */
+ ngx_imap_proxy_close_session(s);
+}
+
+
+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 data, do_write;
@@ -21,23 +207,30 @@ void ngx_imap_proxy_handler(ngx_event_t *ev)
if (c == s->connection) {
src = c;
- dst = s->proxy->connection;
- b = s->proxy->downstream_buffer;
+ dst = s->proxy->upstream.connection;
+ b = s->buffer;
} else {
- src = s->proxy->connection;
- dst = c;
- b = s->proxy->upstream_buffer;
+ 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 {
data = 0;
if (do_write == 1) {
- if (dst->write->ready && b->pos < b->last) {
- n = ngx_send(dst, b->pos, b->last - b->pos);
+
+ size = b->last - b->pos;
+
+ if (dst->write->ready && size) {
+ n = ngx_send(dst, b->pos, size);
if (n == NGX_ERROR) {
ngx_imap_proxy_close_session(s);
@@ -53,11 +246,23 @@ void ngx_imap_proxy_handler(ngx_event_t *ev)
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;
+ }
+ }
}
}
- if (src->read->ready && b->last < b->end) {
- n = ngx_recv(src, b->last, b->end - b->last);
+ size = b->end - b->last;
+
+ if (src->read->ready && size) {
+ n = ngx_recv(src, b->last, size);
if (n == NGX_ERROR || n == 0) {
ngx_imap_proxy_close_session(s);
@@ -69,6 +274,13 @@ void ngx_imap_proxy_handler(ngx_event_t *ev)
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 (data);
@@ -77,4 +289,10 @@ void ngx_imap_proxy_handler(ngx_event_t *ev)
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);
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-17 13:27:05 +0000