dovecot-2.0: Added "script" service that can be used to easily e...

[dovecot at dovecot.org]

details:   http://hg.dovecot.org/dovecot-2.0/rev/19c661891964
changeset: 11461:19c661891964
user:      Timo Sirainen <tss at iki.fi>
date:      Wed Jun 02 18:46:26 2010 +0100
description:
Added "script" service that can be used to easily execute programs via UNIX socket.

diffstat:

 .hgignore            |    1 +
 src/util/Makefile.am |    6 ++
 src/util/script.c    |  125 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 132 insertions(+), 0 deletions(-)

diffs (163 lines):

diff -r 3ac8c5dd9c30 -r 19c661891964 .hgignore
--- a/.hgignore	Wed Jun 02 18:45:02 2010 +0100
+++ b/.hgignore	Wed Jun 02 18:46:26 2010 +0100
@@ -86,6 +86,7 @@
 src/util/listview
 src/util/maildirlock
 src/util/rawlog
+src/util/script
 src/util/script-login
 src/util/tcpwrap
 src/plugins/quota/rquota_xdr.c
diff -r 3ac8c5dd9c30 -r 19c661891964 src/util/Makefile.am
--- a/src/util/Makefile.am	Wed Jun 02 18:45:02 2010 +0100
+++ b/src/util/Makefile.am	Wed Jun 02 18:46:26 2010 +0100
@@ -2,6 +2,7 @@
 
 pkglibexec_PROGRAMS = \
 	rawlog \
+	script \
 	script-login \
 	$(TCPWRAP_BIN) \
 	gdbhelper \
@@ -32,6 +33,11 @@
 script_login_SOURCES = \
 	script-login.c
 
+script_LDADD = $(LIBDOVECOT) $(MODULE_LIBS)
+script_DEPENDENCIES = $(LIBDOVECOT_DEPS)
+script_SOURCES = \
+	script.c
+
 if TCPWRAPPERS
 TCPWRAP_BIN = tcpwrap
 tcpwrap_LDADD = $(LIBDOVECOT) $(MODULE_LIBS) $(LIBWRAP_LIBS)
diff -r 3ac8c5dd9c30 -r 19c661891964 src/util/script.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/util/script.c	Wed Jun 02 18:46:26 2010 +0100
@@ -0,0 +1,125 @@
+/* Copyright (c) 2010 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "execv-const.h"
+#include "master-interface.h"
+#include "master-service.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+
+#define SCRIPT_MAJOR_VERSION 1
+#define SCRIPT_READ_TIMEOUT_SECS 10
+
+static ARRAY_TYPE(const_string) exec_args;
+
+static void script_verify_version(const char *line)
+{
+	if (line == NULL ||
+	    !version_string_verify(line, "script", SCRIPT_MAJOR_VERSION)) {
+		i_fatal("Client not compatible with this binary "
+			"(connecting to wrong socket?)");
+	}
+}
+
+static void client_connected(struct master_service_connection *conn)
+{
+	const unsigned char *end;
+	const char *const *args;
+	buffer_t *input;
+	void *buf;
+	unsigned int i, socket_count;
+	size_t prev_size;
+	ssize_t ret;
+
+	net_set_nonblock(conn->fd, FALSE);
+	input = buffer_create_dynamic(pool_datastack_create(), IO_BLOCK_SIZE);
+
+	/* Input contains:
+
+	   VERSION .. <lf>
+	   arg 1 <lf>
+	   arg 2 <lf>
+	   ...
+	   <lf> */
+	alarm(SCRIPT_READ_TIMEOUT_SECS);
+	do {
+		prev_size = input->used;
+		buf = buffer_append_space_unsafe(input, IO_BLOCK_SIZE);
+		ret = read(conn->fd, buf, IO_BLOCK_SIZE);
+		if (ret <= 0) {
+			buffer_set_used_size(input, prev_size);
+			if (strchr(str_c(input), '\n') != NULL)
+				script_verify_version(t_strcut(str_c(input), '\t'));
+
+			if (ret < 0)
+				i_fatal("read() failed: %m");
+			else
+				i_fatal("read() failed: disconnected");
+		}
+		buffer_set_used_size(input, prev_size + ret);
+		end = CONST_PTR_OFFSET(input->data, input->used);
+	} while (!(end[-1] == '\n' && (input->used == 1 || end[-2] == '\n')));
+
+	/* drop the last LF */
+	buffer_set_used_size(input, input->used - 1);
+
+	args = t_strsplit(str_c(input), "\n");
+	script_verify_version(*args);
+
+	for (args++; *args != NULL; args++)
+		array_append(&exec_args, args, 1);
+	(void)array_append_space(&exec_args);
+
+	/* close all fds */
+	socket_count = master_service_get_socket_count(master_service);
+	for (i = 0; i < socket_count; i++) {
+		if (close(MASTER_LISTEN_FD_FIRST + i) < 0)
+			i_error("close(listener) failed: %m");
+	}
+	if (close(MASTER_STATUS_FD) < 0)
+		i_error("close(status) failed: %m");
+	if (close(conn->fd) < 0)
+		i_error("close() failed: %m");
+
+	args = array_idx(&exec_args, 0);
+	execvp_const(args[0], args);
+}
+
+int main(int argc, char *argv[])
+{
+	const char *binary;
+	int i;
+
+	master_service = master_service_init("script", 0, &argc, &argv, NULL);
+	if (master_getopt(master_service) > 0)
+		return FATAL_DEFAULT;
+	argc -= optind;
+	argv += optind;
+
+	master_service_init_log(master_service, "script: ");
+	master_service_init_finish(master_service);
+	master_service_set_service_count(master_service, 1);
+
+	if (argv[0] == NULL)
+		i_fatal("Missing script path");
+
+	if (argv[0][0] == '/')
+		binary = argv[0];
+	else
+		binary = t_strconcat(PKG_LIBEXECDIR"/", argv[0], NULL);
+
+	i_array_init(&exec_args, argc + 16);
+	array_append(&exec_args, &binary, 1);
+	for (i = 1; i < argc; i++) {
+		const char *arg = argv[i];
+
+		array_append(&exec_args, &arg, 1);
+	}
+
+	master_service_run(master_service, client_connected);
+	master_service_deinit(&master_service);
+        return 0;
+}