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[Qemu-devel] [RFC][PATCH v2 05/10] virtagent: add getfile RPC
From: |
Michael Roth |
Subject: |
[Qemu-devel] [RFC][PATCH v2 05/10] virtagent: add getfile RPC |
Date: |
Wed, 3 Nov 2010 06:35:34 -0500 |
Add RPC to retrieve a guest file. A size limit of some sort will
eventually be needed else we can block the monitor for arbitrarily long
periods of time. This interface is intended for smaller reads like
peeking at logs and /proc and such.
Signed-off-by: Michael Roth <address@hidden>
---
virtagent-daemon.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/virtagent-daemon.c b/virtagent-daemon.c
index 71a36d4..bf28be2 100644
--- a/virtagent-daemon.c
+++ b/virtagent-daemon.c
@@ -15,6 +15,57 @@
#include "virtagent-daemon.h"
#include "virtagent-common.h"
+/* RPC functions common to guest/host daemons */
+
+static xmlrpc_value *getfile(xmlrpc_env *env,
+ xmlrpc_value *param,
+ void *user_data)
+{
+ const char *path;
+ char *file_contents = NULL;
+ char buf[VA_FILEBUF_LEN];
+ int fd, ret, count = 0;
+ xmlrpc_value *result = NULL;
+
+ /* parse argument array */
+ xmlrpc_decompose_value(env, param, "(s)", &path);
+ if (env->fault_occurred) {
+ return NULL;
+ }
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1) {
+ LOG("open failed: %s", strerror(errno));
+ xmlrpc_faultf(env, "open failed: %s", strerror(errno));
+ return NULL;
+ }
+
+ while ((ret = read(fd, buf, VA_FILEBUF_LEN)) > 0) {
+ file_contents = qemu_realloc(file_contents, count + VA_FILEBUF_LEN);
+ memcpy(file_contents + count, buf, ret);
+ count += ret;
+ if (count > VA_GETFILE_MAX) {
+ xmlrpc_faultf(env, "max file size (%d bytes) exceeded",
+ VA_GETFILE_MAX);
+ goto EXIT_CLOSE_BAD;
+ }
+ }
+ if (ret == -1) {
+ LOG("read failed: %s", strerror(errno));
+ xmlrpc_faultf(env, "read failed: %s", strerror(errno));
+ goto EXIT_CLOSE_BAD;
+ }
+
+ result = xmlrpc_build_value(env, "6", file_contents, count);
+
+EXIT_CLOSE_BAD:
+ if (file_contents) {
+ qemu_free(file_contents);
+ }
+ close(fd);
+ return result;
+}
+
static int va_accept(int listen_fd) {
struct sockaddr_in saddr;
struct sockaddr *addr;
@@ -42,6 +93,8 @@ typedef struct RPCFunction {
} RPCFunction;
static RPCFunction guest_functions[] = {
+ { .func = getfile,
+ .func_name = "getfile" },
{ NULL, NULL }
};
static RPCFunction host_functions[] = {
--
1.7.0.4
- [Qemu-devel] [RFC][PATCH v2 00/10] virtagent: host/guest RPC communication agent, Michael Roth, 2010/11/03
- [Qemu-devel] [RFC][PATCH v2 04/10] virtagent: base RPC client definitions, Michael Roth, 2010/11/03
- [Qemu-devel] [RFC][PATCH v2 01/10] virtagent: add common rpc transport defs, Michael Roth, 2010/11/03
- [Qemu-devel] [RFC][PATCH v2 05/10] virtagent: add getfile RPC,
Michael Roth <=
- [Qemu-devel] [RFC][PATCH v2 09/10] virtagent: Makefile/configure changes to build virtagent bits, Michael Roth, 2010/11/03
- [Qemu-devel] [RFC][PATCH v2 07/10] virtagent: add getdmesg RPC, Michael Roth, 2010/11/03
- [Qemu-devel] [RFC][PATCH v2 06/10] virtagent: add agent_viewfile command, Michael Roth, 2010/11/03
- [Qemu-devel] [RFC][PATCH v2 02/10] virtagent: base definitions for host/guest RPC daemon, Michael Roth, 2010/11/03
- [Qemu-devel] [RFC][PATCH v2 08/10] virtagent: add agent_viewdmesg command, Michael Roth, 2010/11/03
- [Qemu-devel] [RFC][PATCH v2 10/10] virtproxy: add compat defs for linking against vl.c, Michael Roth, 2010/11/03
- [Qemu-devel] [RFC][PATCH v2 03/10] virtagent: qemu-vp, integrate virtagent server, Michael Roth, 2010/11/03