Run executable files as CGI scripts

Now if the server encounters an executable file that doesn't have a .php
extension, it will run it as a CGI script. There should maybe be better
heuristics for determining whether a file actually is a CGI script
(sometimes files copied from Windows can be marked as executable) but
this works for now.

3 files changed, 17 insertions, 4 deletions

diff --git a/cfws.c b/cfws.c
index 930264a..04ec3c3 100644
--- a/cfws.c
+++ b/cfws.c
@@ -126,7 +126,12 @@ static void handle_request(const struct http_request *req, int sockfd)
 	case SERVE_METHOD_PHP:
 		if (flag_verbose)
 			printf(" -> PHP  %s\n", filepath);
-		file_read_php(filepath, req, sockfd);
+		file_read_cgi(filepath, "/usr/bin/php-cgi", req, sockfd);
+		break;
+	case SERVE_METHOD_CGI:
+		if (flag_verbose)
+			printf(" -> CGI  %s\n", filepath);
+		file_read_cgi(filepath, filepath, req, sockfd);
 		break;
 	case SERVE_METHOD_ERROR: {
 		if (flag_verbose)
diff --git a/file.c b/file.c
index b64480c..4e42c58 100644
--- a/file.c
+++ b/file.c
@@ -48,6 +48,8 @@ const char *file_path_for_uri(const char *uri)
 
 enum serve_method file_method_for_path(const char *filepath, enum http_res_code *code)
 {
+	struct stat statbuf;
+
 	if (access(filepath, F_OK) != 0) {
 		*code = HTTP_RESPONSE_NOTFOUND;
 		return SERVE_METHOD_ERROR;
@@ -57,6 +59,11 @@ enum serve_method file_method_for_path(const char *filepath, enum http_res_code
 	if (strstr(filepath, ".php") != 0)
 		return SERVE_METHOD_PHP;
 
+	stat(filepath, &statbuf);
+	if (statbuf.st_mode & S_IXUSR) {
+		return SERVE_METHOD_CGI;
+	}
+
 	return SERVE_METHOD_FILE;
 }
 
@@ -128,7 +135,7 @@ static void cgi_setup_env(const char *filepath, const struct http_request *req)
 	}
 }
 
-int file_read_php(const char *filepath, const struct http_request *req, int sockfd)
+int file_read_cgi(const char *filepath, const char *program, const struct http_request *req, int sockfd)
 {
 	int readfds[2];
 	int writefds[2];
@@ -171,7 +178,7 @@ int file_read_php(const char *filepath, const struct http_request *req, int sock
 			}
 		}
 
-		execl("/usr/bin/php-cgi", "php-cgi", NULL);
+		execl(program, program, NULL);
 		/* We should only end up here if there's an error. */
 		perror("exec");
 		exit(1);
diff --git a/file.h b/file.h
index 9c48425..ce76a7f 100644
--- a/file.h
+++ b/file.h
@@ -8,6 +8,7 @@
 enum serve_method {
 	SERVE_METHOD_FILE,
 	SERVE_METHOD_PHP,
+	SERVE_METHOD_CGI,
 	SERVE_METHOD_ERROR
 };
 
@@ -16,6 +17,6 @@ const char *file_path_for_uri(const char *);
 enum serve_method file_method_for_path(const char *, enum http_res_code *);
 
 int file_read(const char *, int);
-int file_read_php(const char *, const struct http_request *, int);
+int file_read_cgi(const char *, const char *, const struct http_request *, int);
 
 #endif