void replace_eventcb(struct bufferevent * buffev, bufferevent_event_cb eventcb)
{
#if LIBEVENT_VERSION_NUMBER >= 0x02010100
bufferevent_data_cb readcb, writecb;
void * arg;
bufferevent_getcb(buffev, &readcb, &writecb, NULL, &arg);
bufferevent_setcb(buffev, readcb, writecb, eventcb, arg);
#else
buffev->errorcb = eventcb;
#endif
}
static int
imap_starttls(struct imap_context *ctx, struct imap_request *req, void *priv)
{
struct bufferevent *bev = ctx->client_bev;
struct evbuffer *output = bufferevent_get_output(bev);
SSL *ssl_client_ctx = SSL_new(ctx->driver->ssl_ctx);
bufferevent_data_cb readcb, writecb;
bufferevent_event_cb eventcb;
void *orig_ctx;
if (ctx->state & IMAP_TLS) {
evbuffer_add_printf(output, "%s BAD TLS layer already in place" CRLF, req->tag.bv_val);
return IMAP_OK;
}
/* retrieve the callbacks to apply them again on the filtering bev */
bufferevent_getcb(bev, &readcb, &writecb, &eventcb, &orig_ctx);
evbuffer_add_printf(output, "%s OK Begin TLS negotiation now" CRLF, req->tag.bv_val);
bev = bufferevent_openssl_filter_new(ctx->driver->base,
bev, ssl_client_ctx,
BUFFEREVENT_SSL_ACCEPTING,
BEV_OPT_CLOSE_ON_FREE);
if (!bev) {
return IMAP_SHUTDOWN;
}
bufferevent_setcb(bev, readcb, writecb, eventcb, orig_ctx);
bufferevent_enable(bev, EV_READ|EV_WRITE);
ctx->client_bev = bev;
ctx->state |= IMAP_TLS;
return IMAP_OK;
}
