[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [RFC][PATCH v3 06/11] virtagent: add agent_viewfile command
From: |
Michael Roth |
Subject: |
[Qemu-devel] [RFC][PATCH v3 06/11] virtagent: add agent_viewfile command |
Date: |
Wed, 10 Nov 2010 19:37:25 -0600 |
Utilize the getfile RPC to provide a means to view text files in the
guest. Getfile can handle binary files as well but we don't advertise
that here due to the special handling requiring to store it and provide
it back to the user (base64 encoding it for instance). Hence the
potentially confusing "viewfile" as opposed to "getfile".
Signed-off-by: Michael Roth <address@hidden>
---
hmp-commands.hx | 16 +++++++++
qmp-commands.hx | 33 ++++++++++++++++++
virtagent.c | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
virtagent.h | 3 ++
4 files changed, 152 insertions(+), 0 deletions(-)
diff --git a/hmp-commands.hx b/hmp-commands.hx
index e5585ba..423c752 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1212,6 +1212,22 @@ show available trace events and their state
ETEXI
#endif
+ {
+ .name = "agent_viewfile",
+ .args_type = "filepath:s",
+ .params = "filepath",
+ .help = "Echo a file from the guest filesystem",
+ .user_print = do_agent_viewfile_print,
+ .mhandler.cmd_async = do_agent_viewfile,
+ .flags = MONITOR_CMD_ASYNC,
+ },
+
+STEXI
address@hidden agent_viewfile @var{filepath}
address@hidden agent_viewfile
+Echo the file identified by @var{filepath} on the guest filesystem
+ETEXI
+
STEXI
@end table
ETEXI
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 793cf1c..efa2137 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -738,6 +738,39 @@ Example:
EQMP
{
+ .name = "agent_viewfile",
+ .args_type = "filepath:s",
+ .params = "filepath",
+ .help = "Echo a file from the guest filesystem",
+ .user_print = monitor_user_noop,
+ .mhandler.cmd_async = do_agent_viewfile,
+ .flags = MONITOR_CMD_ASYNC,
+ },
+
+STEXI
address@hidden agent_viewfile @var{filepath}
address@hidden agent_viewfile
+Echo the file identified by @var{filepath} on the guest filesystem
+ETEXI
+SQMP
+agent_viewfile
+--------
+
+Echo the file identified by @var{filepath} from the guest filesystem.
+
+Arguments:
+
+- "filepath": Full guest path of the desired file
+
+Example:
+
+-> { "execute": "agent_viewfile",
+ "arguments": { "filepath": "/sys/kernel/kexec_loaded" } }
+<- { "return": { "contents": "0" } }
+
+EQMP
+
+ {
.name = "qmp_capabilities",
.args_type = "",
.params = "",
diff --git a/virtagent.c b/virtagent.c
index cfd279f..2e496f9 100644
--- a/virtagent.c
+++ b/virtagent.c
@@ -143,3 +143,103 @@ out_callxml:
out:
return ret;
}
+
+void do_agent_viewfile_print(Monitor *mon, const QObject *data)
+{
+ QDict *qdict;
+ const char *contents = NULL;
+ int i;
+
+ qdict = qobject_to_qdict(data);
+ if (!qdict_haskey(qdict, "contents")) {
+ return;
+ }
+
+ contents = qdict_get_str(qdict, "contents");
+ if (contents != NULL) {
+ /* monitor_printf truncates so do it in chunks. also, file_contents
+ * may not be null-termed at proper location so explicitly calc
+ * last chunk sizes */
+ for (i = 0; i < strlen(contents); i += 1024) {
+ monitor_printf(mon, "%.1024s", contents + i);
+ }
+ }
+ monitor_printf(mon, "\n");
+}
+
+static void do_agent_viewfile_cb(void *opaque)
+{
+ VARPCData *rpc_data = opaque;
+ xmlrpc_value *resp = NULL;
+ char *file_contents = NULL;
+ size_t file_size;
+ int ret;
+ xmlrpc_env env;
+ QDict *qdict = qdict_new();
+
+ if (rpc_data->status != VA_RPC_STATUS_OK) {
+ LOG("error handling RPC request");
+ goto out_no_resp;
+ }
+
+ xmlrpc_env_init(&env);
+ resp = xmlrpc_parse_response(&env, rpc_data->resp_xml,
+ rpc_data->resp_xml_len);
+ if (rpc_has_error(&env)) {
+ ret = -1;
+ goto out_no_resp;
+ }
+
+ xmlrpc_parse_value(&env, resp, "6", &file_contents, &file_size);
+ if (rpc_has_error(&env)) {
+ ret = -1;
+ goto out;
+ }
+
+ if (file_contents != NULL) {
+ qdict_put(qdict, "contents",
+ qstring_from_substr(file_contents, 0, file_size-1));
+ }
+
+out:
+ xmlrpc_DECREF(resp);
+out_no_resp:
+ rpc_data->mon_cb(rpc_data->mon_data, QOBJECT(qdict));
+}
+
+/*
+ * do_agent_viewfile(): View a text file in the guest
+ */
+int do_agent_viewfile(Monitor *mon, const QDict *mon_params,
+ MonitorCompletion cb, void *opaque)
+{
+ xmlrpc_env env;
+ xmlrpc_value *params;
+ VARPCData *rpc_data;
+ const char *filepath;
+ int ret;
+
+ filepath = qdict_get_str(mon_params, "filepath");
+ xmlrpc_env_init(&env);
+ params = xmlrpc_build_value(&env, "(s)", filepath);
+ if (rpc_has_error(&env)) {
+ return -1;
+ }
+
+ rpc_data = qemu_mallocz(sizeof(VARPCData));
+ rpc_data->cb = do_agent_viewfile_cb;
+ rpc_data->mon_cb = cb;
+ rpc_data->mon_data = opaque;
+
+ ret = rpc_execute(&env, "getfile", params, rpc_data);
+ if (ret == -EREMOTE) {
+ monitor_printf(mon, "RPC Failed (%i): %s\n", env.fault_code,
+ env.fault_string);
+ return -1;
+ } else if (ret == -1) {
+ monitor_printf(mon, "RPC communication error\n");
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/virtagent.h b/virtagent.h
index 53efa29..63d77c2 100644
--- a/virtagent.h
+++ b/virtagent.h
@@ -23,5 +23,8 @@
#define VA_MAX_CHUNK_SIZE 4096 /* max bytes at a time for get/send file */
int va_client_init(VPDriver *vp_drv, bool is_host);
+void do_agent_viewfile_print(Monitor *mon, const QObject *qobject);
+int do_agent_viewfile(Monitor *mon, const QDict *mon_params,
+ MonitorCompletion cb, void *opaque);
#endif /* VIRTAGENT_H */
--
1.7.0.4
- [Qemu-devel] [RFC][PATCH v3 00/11] virtagent: host/guest RPC communication agent, Michael Roth, 2010/11/10
- [Qemu-devel] [RFC][PATCH v3 01/11] virtagent: add common rpc transport defs, Michael Roth, 2010/11/10
- [Qemu-devel] [RFC][PATCH v3 03/11] virtagent: qemu-vp, integrate virtagent server, Michael Roth, 2010/11/10
- [Qemu-devel] [RFC][PATCH v3 05/11] virtagent: add getfile RPC, Michael Roth, 2010/11/10
- [Qemu-devel] [RFC][PATCH v3 06/11] virtagent: add agent_viewfile command,
Michael Roth <=
- [Qemu-devel] [RFC][PATCH v3 10/11] virtagent: qemu integration, add va invocation via virtproxy chardev, Michael Roth, 2010/11/10
- [Qemu-devel] [RFC][PATCH v3 11/11] virtagent: Makefile/configure changes to build virtagent bits, Michael Roth, 2010/11/10
- [Qemu-devel] [RFC][PATCH v3 09/11] virtagent: qemu-vp integration, use virtagent init functions, Michael Roth, 2010/11/10
- [Qemu-devel] [RFC][PATCH v3 07/11] virtagent: add getdmesg RPC, Michael Roth, 2010/11/10
- [Qemu-devel] [RFC][PATCH v3 08/11] virtagent: add agent_viewdmesg command, Michael Roth, 2010/11/10
- [Qemu-devel] [RFC][PATCH v3 04/11] virtagent: base RPC client definitions, Michael Roth, 2010/11/10
- [Qemu-devel] [RFC][PATCH v3 02/11] virtagent: base definitions for host/guest RPC server, Michael Roth, 2010/11/10
- [Qemu-devel] Re: [RFC][PATCH v3 00/11] virtagent: host/guest RPC communication agent, Amit Shah, 2010/11/25