2 * collectd - src/utils_cmds.c
3 * Copyright (C) 2008 Florian Forster
4 * Copyright (C) 2016 Sebastian 'tokkee' Harl
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
25 * Florian octo Forster <octo at collectd.org>
26 * Sebastian 'tokkee' Harl <sh at tokkee.org>
29 #include "utils_cmds.h"
30 #include "utils_cmd_flush.h"
31 #include "utils_cmd_listval.h"
32 #include "utils_cmd_putval.h"
33 #include "utils_parse_option.h"
34 #include "daemon/common.h"
40 * private helper functions
43 static cmd_status_t cmd_split (char *buffer,
44 size_t *ret_len, char ***ret_fields,
45 cmd_error_handler_t *err)
48 bool in_field, in_quotes;
55 for (string = buffer; *string != '\0'; ++string)
57 /* Make a quick worst-case estimate of the number of fields by
58 * counting spaces and ignoring quotation marks. */
59 if (!isspace ((int)*string))
73 /* fields will be NULL-terminated */
74 fields = malloc ((estimate + 1) * sizeof (*fields));
76 cmd_error (CMD_ERROR, err, "malloc failed.");
90 assert (len < estimate); \
91 fields[len] = field; \
100 for (string = buffer; *string != '\0'; string++)
102 if (isspace ((int)string[0]))
113 else if (string[0] == '"')
115 /* Note: Two consecutive quoted fields not separated by space are
116 * treated as different fields. This is the collectd 5.x behavior
117 * around splitting fields. */
121 /* end of quoted field */
122 if (! in_field) /* empty quoted string */
130 /* if (! in_field): add new field on next iteration
131 * else: quoted string following an unquoted string (one field)
132 * in either case: skip quotation mark */
135 else if ((string[0] == '\\') && in_quotes)
137 /* Outside of quotes, a backslash is a regular character (mostly
138 * for backward compatibility). */
140 if (string[1] == '\0')
143 cmd_error (CMD_PARSE_ERROR, err,
144 "Backslash at end of string.");
145 return (CMD_PARSE_ERROR);
148 /* un-escape the next character; skip backslash */
163 cmd_error (CMD_PARSE_ERROR, err, "Unterminated quoted string.");
164 return (CMD_PARSE_ERROR);
173 if (ret_fields != NULL)
174 *ret_fields = fields;
178 } /* int cmd_split */
184 void cmd_error (cmd_status_t status, cmd_error_handler_t *err,
185 const char *format, ...)
189 if ((err == NULL) || (err->cb == NULL))
192 va_start (ap, format);
193 err->cb (err->ud, status, format, ap);
195 } /* void cmd_error */
197 cmd_status_t cmd_parsev (size_t argc, char **argv,
198 cmd_t *ret_cmd, cmd_error_handler_t *err)
200 char *command = NULL;
202 if ((argc < 1) || (argv == NULL) || (ret_cmd == NULL))
205 cmd_error (CMD_ERROR, err, "Missing command.");
209 memset (ret_cmd, 0, sizeof (*ret_cmd));
211 if (strcasecmp ("FLUSH", command) == 0)
213 ret_cmd->type = CMD_FLUSH;
214 return cmd_parse_flush (argc - 1, argv + 1,
215 &ret_cmd->cmd.flush, err);
217 else if (strcasecmp ("LISTVAL", command) == 0)
219 ret_cmd->type = CMD_LISTVAL;
220 return cmd_parse_listval (argc - 1, argv + 1,
221 &ret_cmd->cmd.listval, err);
223 else if (strcasecmp ("PUTVAL", command) == 0)
225 ret_cmd->type = CMD_PUTVAL;
226 return cmd_parse_putval (argc - 1, argv + 1,
227 &ret_cmd->cmd.putval, err);
231 ret_cmd->type = CMD_UNKNOWN;
232 cmd_error (CMD_UNKNOWN_COMMAND, err,
233 "Unknown command `%s'.", command);
234 return (CMD_UNKNOWN_COMMAND);
238 } /* cmd_status_t cmd_parsev */
240 cmd_status_t cmd_parse (char *buffer,
241 cmd_t *ret_cmd, cmd_error_handler_t *err)
243 char **fields = NULL;
244 size_t fields_num = 0;
247 if ((status = cmd_split (buffer, &fields_num, &fields, err)) != CMD_OK)
250 status = cmd_parsev (fields_num, fields, ret_cmd, err);
253 } /* cmd_status_t cmd_parse */
255 void cmd_destroy (cmd_t *cmd)
266 cmd_destroy_flush (&cmd->cmd.flush);
269 cmd_destroy_listval (&cmd->cmd.listval);
272 cmd_destroy_putval (&cmd->cmd.putval);
275 } /* void cmd_destroy */
277 cmd_status_t cmd_parse_option (char *field,
278 char **ret_key, char **ret_value, cmd_error_handler_t *err)
285 cmd_error (CMD_ERROR, err, "Invalid argument to cmd_parse_option.");
290 /* Look for the equal sign. */
291 while (isalnum ((int)value[0]) || (value[0] == '_') || (value[0] == ':'))
293 if ((value[0] != '=') || (value == key))
295 /* Whether this is a fatal error is up to the caller. */
296 return (CMD_NO_OPTION);
303 if (ret_value != NULL)
307 } /* cmd_status_t cmd_parse_option */
309 void cmd_error_fh (void *ud, cmd_status_t status,
310 const char *format, va_list ap)
316 if (status == CMD_OK)
319 vsnprintf (buf, sizeof(buf), format, ap);
320 buf[sizeof (buf) - 1] = '\0';
321 if (fprintf (fh, "%i %s\n", code, buf) < 0)
324 WARNING ("utils_cmds: failed to write to file-handle #%i: %s",
325 fileno (fh), sstrerror (errno, errbuf, sizeof (errbuf)));
330 } /* void cmd_error_fh */
332 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */