1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*
* QTest
*
* Copyright IBM, Corp. 2012
* Copyright Red Hat, Inc. 2012
* Copyright SUSE LINUX Products GmbH 2013
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Paolo Bonzini <pbonzini@redhat.com>
* Andreas Färber <afaerber@suse.de>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "libqmp.h"
#include "qapi/error.h"
#include "qapi/qmp/json-parser.h"
#include "qapi/qmp/qjson.h"
#define SOCKET_MAX_FDS 16
typedef struct {
JSONMessageParser parser;
QDict *response;
} QMPResponseParser;
static void socket_send(int fd, const char *buf, size_t size)
{
size_t res = qemu_write_full(fd, buf, size);
assert(res == size);
}
static void qmp_response(void *opaque, QObject *obj, Error *err)
{
QMPResponseParser *qmp = opaque;
assert(!obj != !err);
if (err) {
error_prepend(&err, "QMP JSON response parsing failed: ");
error_report_err(err);
abort();
}
g_assert(!qmp->response);
qmp->response = qobject_to(QDict, obj);
g_assert(qmp->response);
}
QDict *qmp_fd_receive(int fd)
{
QMPResponseParser qmp;
bool log = getenv("QTEST_LOG") != NULL;
qmp.response = NULL;
json_message_parser_init(&qmp.parser, qmp_response, &qmp, NULL);
while (!qmp.response) {
ssize_t len;
char c;
len = read(fd, &c, 1);
if (len == -1 && errno == EINTR) {
continue;
}
if (len == -1 || len == 0) {
fprintf(stderr, "Broken pipe\n");
abort();
}
if (log) {
g_assert(write(2, &c, 1) == 1);
}
json_message_parser_feed(&qmp.parser, &c, 1);
}
if (log) {
g_assert(write(2, "\n", 1) == 1);
}
json_message_parser_destroy(&qmp.parser);
return qmp.response;
}
/* Sends a message and file descriptors to the socket.
* It's needed for qmp-commands like getfd/add-fd */
static void socket_send_fds(int socket_fd, int *fds, size_t fds_num,
const char *buf, size_t buf_size)
{
ssize_t ret;
struct msghdr msg = { 0 };
char control[CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS)] = { 0 };
size_t fdsize = sizeof(int) * fds_num;
struct cmsghdr *cmsg;
struct iovec iov = { .iov_base = (char *)buf, .iov_len = buf_size };
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
if (fds && fds_num > 0) {
g_assert_cmpuint(fds_num, <, SOCKET_MAX_FDS);
msg.msg_control = control;
msg.msg_controllen = CMSG_SPACE(fdsize);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(fdsize);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
memcpy(CMSG_DATA(cmsg), fds, fdsize);
}
do {
ret = sendmsg(socket_fd, &msg, 0);
} while (ret < 0 && errno == EINTR);
g_assert_cmpint(ret, >, 0);
}
/**
* Allow users to send a message without waiting for the reply,
* in the case that they choose to discard all replies up until
* a particular EVENT is received.
*/
void qmp_fd_vsend_fds(int fd, int *fds, size_t fds_num,
const char *fmt, va_list ap)
{
QObject *qobj;
/* Going through qobject ensures we escape strings properly */
qobj = qobject_from_vjsonf_nofail(fmt, ap);
/* No need to send anything for an empty QObject. */
if (qobj) {
int log = getenv("QTEST_LOG") != NULL;
GString *str = qobject_to_json(qobj);
/*
* BUG: QMP doesn't react to input until it sees a newline, an
* object, or an array. Work-around: give it a newline.
*/
g_string_append_c(str, '\n');
if (log) {
fprintf(stderr, "%s", str->str);
}
/* Send QMP request */
if (fds && fds_num > 0) {
socket_send_fds(fd, fds, fds_num, str->str, str->len);
} else {
socket_send(fd, str->str, str->len);
}
g_string_free(str, true);
qobject_unref(qobj);
}
}
void qmp_fd_vsend(int fd, const char *fmt, va_list ap)
{
qmp_fd_vsend_fds(fd, NULL, 0, fmt, ap);
}
QDict *qmp_fdv(int fd, const char *fmt, va_list ap)
{
qmp_fd_vsend_fds(fd, NULL, 0, fmt, ap);
return qmp_fd_receive(fd);
}
QDict *qmp_fd(int fd, const char *fmt, ...)
{
va_list ap;
QDict *response;
va_start(ap, fmt);
response = qmp_fdv(fd, fmt, ap);
va_end(ap);
return response;
}
void qmp_fd_send(int fd, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
qmp_fd_vsend(fd, fmt, ap);
va_end(ap);
}
void qmp_fd_vsend_raw(int fd, const char *fmt, va_list ap)
{
bool log = getenv("QTEST_LOG") != NULL;
char *str = g_strdup_vprintf(fmt, ap);
if (log) {
fprintf(stderr, "%s", str);
}
socket_send(fd, str, strlen(str));
g_free(str);
}
void qmp_fd_send_raw(int fd, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
qmp_fd_vsend_raw(fd, fmt, ap);
va_end(ap);
}
bool qmp_rsp_is_err(QDict *rsp)
{
QDict *error = qdict_get_qdict(rsp, "error");
qobject_unref(rsp);
return !!error;
}
void qmp_expect_error_and_unref(QDict *rsp, const char *class)
{
QDict *error = qdict_get_qdict(rsp, "error");
g_assert_cmpstr(qdict_get_try_str(error, "class"), ==, class);
g_assert_nonnull(qdict_get_try_str(error, "desc"));
g_assert(!qdict_haskey(rsp, "return"));
qobject_unref(rsp);
}
|
