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
|
// SPDX-License-Identifier: GPL-3.0-or-later
#include "cli.h"
#include "../libnetdata/required_dummies.h"
static uv_pipe_t client_pipe;
static uv_write_t write_req;
static uv_shutdown_t shutdown_req;
static char command_string[MAX_COMMAND_LENGTH];
static unsigned command_string_size;
static char response_string[MAX_COMMAND_LENGTH];
static unsigned response_string_size;
static int exit_status;
struct command_context {
uv_work_t work;
uv_stream_t *client;
cmd_t idx;
char *args;
char *message;
cmd_status_t status;
};
static void parse_command_reply(void)
{
FILE *stream = NULL;
char *pos;
int syntax_error = 0;
for (pos = response_string ;
pos < response_string + response_string_size && !syntax_error ;
++pos) {
/* Skip white-space characters */
for ( ; isspace(*pos) && ('\0' != *pos); ++pos) {;}
if ('\0' == *pos)
continue;
switch (*pos) {
case CMD_PREFIX_EXIT_CODE:
exit_status = atoi(++pos);
break;
case CMD_PREFIX_INFO:
stream = stdout;
break;
case CMD_PREFIX_ERROR:
stream = stderr;
break;
default:
syntax_error = 1;
fprintf(stderr, "Syntax error, failed to parse command response.\n");
break;
}
if (stream) {
fprintf(stream, "%s\n", ++pos);
pos += strlen(pos);
stream = NULL;
}
}
}
static void pipe_read_cb(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf)
{
if (0 == nread) {
fprintf(stderr, "%s: Zero bytes read by command pipe.\n", __func__);
} else if (UV_EOF == nread) {
// fprintf(stderr, "EOF found in command pipe.\n");
parse_command_reply();
} else if (nread < 0) {
fprintf(stderr, "%s: %s\n", __func__, uv_strerror(nread));
}
if (nread < 0) { /* stop stream due to EOF or error */
(void)uv_read_stop((uv_stream_t *)client);
} else if (nread) {
size_t to_copy;
to_copy = MIN(nread, MAX_COMMAND_LENGTH - 1 - response_string_size);
memcpy(response_string + response_string_size, buf->base, to_copy);
response_string_size += to_copy;
response_string[response_string_size] = '\0';
}
if (buf && buf->len) {
free(buf->base);
}
}
static void alloc_cb(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf)
{
(void)handle;
buf->base = malloc(suggested_size);
buf->len = suggested_size;
}
static void shutdown_cb(uv_shutdown_t* req, int status)
{
int ret;
(void)req;
(void)status;
/* receive reply */
response_string_size = 0;
response_string[0] = '\0';
ret = uv_read_start((uv_stream_t *)&client_pipe, alloc_cb, pipe_read_cb);
if (ret) {
fprintf(stderr, "uv_read_start(): %s\n", uv_strerror(ret));
uv_close((uv_handle_t *)&client_pipe, NULL);
return;
}
}
static void pipe_write_cb(uv_write_t* req, int status)
{
int ret;
(void)req;
(void)status;
ret = uv_shutdown(&shutdown_req, (uv_stream_t *)&client_pipe, shutdown_cb);
if (ret) {
fprintf(stderr, "uv_shutdown(): %s\n", uv_strerror(ret));
uv_close((uv_handle_t *)&client_pipe, NULL);
return;
}
}
static void connect_cb(uv_connect_t* req, int status)
{
int ret;
uv_buf_t write_buf;
char *s;
(void)req;
if (status) {
fprintf(stderr, "uv_pipe_connect(): %s\n", uv_strerror(status));
fprintf(stderr, "Make sure the netdata service is running.\n");
exit(-1);
}
if (0 == command_string_size) {
s = fgets(command_string, MAX_COMMAND_LENGTH, stdin);
}
(void)s; /* We don't need input to communicate with the server */
command_string_size = strlen(command_string);
write_req.data = &client_pipe;
write_buf.base = command_string;
write_buf.len = command_string_size;
ret = uv_write(&write_req, (uv_stream_t *)&client_pipe, &write_buf, 1, pipe_write_cb);
if (ret) {
fprintf(stderr, "uv_write(): %s\n", uv_strerror(ret));
}
// fprintf(stderr, "COMMAND: Sending command: \"%s\"\n", command_string);
}
int main(int argc, char **argv)
{
int ret, i;
static uv_loop_t* loop;
uv_connect_t req;
exit_status = -1; /* default status for when there is no command response from server */
loop = uv_default_loop();
ret = uv_pipe_init(loop, &client_pipe, 1);
if (ret) {
fprintf(stderr, "uv_pipe_init(): %s\n", uv_strerror(ret));
return exit_status;
}
command_string_size = 0;
command_string[0] = '\0';
for (i = 1 ; i < argc ; ++i) {
size_t to_copy;
to_copy = MIN(strlen(argv[i]), MAX_COMMAND_LENGTH - 1 - command_string_size);
strncpyz(command_string + command_string_size, argv[i], to_copy);
command_string_size += to_copy;
if (command_string_size < MAX_COMMAND_LENGTH - 1) {
command_string[command_string_size++] = ' ';
} else {
break;
}
}
uv_pipe_connect(&req, &client_pipe, PIPENAME, connect_cb);
uv_run(loop, UV_RUN_DEFAULT);
uv_close((uv_handle_t *)&client_pipe, NULL);
return exit_status;
}
|
