Add async support for FastCGI

src/worker/fastcgi_frame_handler.c

@@ -0,0 +1,70 @@
+/**
+ * sesimos - secure, simple, modern web server
+ * @brief FastCGI frame handler
+ * @file src/worker/fcti_frame_handler.c
+ * @author Lorenz Stechauner
+ * @date 2023-01-22
+ */
+
+#include "func.h"
+#include "../lib/fastcgi.h"
+#include "../logger.h"
+#include "../workers.h"
+
+#include <errno.h>
+#include <memory.h>
+#include <unistd.h>
+
+void fastcgi_frame_handler_func(fastcgi_ctx_t *ctx) {
+    logger_set_prefix("[%*s]%s", ADDRSTRLEN, ctx->client->socket.s_addr, ctx->client->log_prefix);
+
+    switch (fastcgi_recv_frame(&ctx->cnx)) {
+        case FCGI_STDOUT:
+        case FCGI_STDERR:
+            fastcgi_handle_frame(ctx);
+            break;
+        case -1:
+            error("Unable to receive FastCGI frame");
+            ctx->client->s_keep_alive = 0;
+            fastcgi_close(ctx);
+            break;
+        default:
+            // end of request received
+            write(ctx->cnx.fd_out, "\0\0\0\0\0\0\0\0\r\n", 10);
+            fastcgi_close(ctx);
+    }
+}
+
+int fastcgi_handle_connection(client_ctx_t *ctx, fastcgi_cnx_t **cnx) {
+    sock_set_timeout(&(*cnx)->socket, FASTCGI_TIMEOUT);
+    sock_set_socket_timeout(&(*cnx)->socket, 1);
+
+    fastcgi_ctx_t *a = malloc(sizeof(fastcgi_ctx_t));
+    a->closed = 0;
+    a->client = ctx;
+    memcpy(&a->cnx, *cnx, sizeof(fastcgi_cnx_t));
+    ctx->fcgi_cnx = a;
+    fastcgi_handle_frame(a);
+    *cnx = &a->cnx;
+
+    return 0;
+}
+
+void fastcgi_close(fastcgi_ctx_t *ctx) {
+    if (ctx->closed == 0) {
+        ctx->closed++;
+        return;
+    }
+
+    logger_set_prefix("[%*s]%s", ADDRSTRLEN, ctx->client->socket.s_addr, ctx->client->log_prefix);
+
+    if (ctx->cnx.app_status != 0)
+        error("FastCGI app terminated with exit code %i", ctx->cnx.app_status);
+
+    debug("Closing FastCGI connection");
+
+    fastcgi_close_cnx(&ctx->cnx);
+    ctx->client->fcgi_cnx = NULL;
+    free(ctx);
+    errno = 0;
+}