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_putval.h"
31 #include "utils_parse_option.h"
32 #include "daemon/common.h"
38 * private helper functions
41 static cmd_status_t cmd_split (char *buffer,
42 size_t *ret_len, char ***ret_fields,
43 cmd_error_handler_t *err)
46 bool in_field, in_quotes;
53 for (string = buffer; *string != '\0'; ++string)
55 /* Make a quick worst-case estimate of the number of fields by
56 * counting spaces and ignoring quotation marks. */
57 if (!isspace ((int)*string))
71 /* fields will be NULL-terminated */
72 fields = malloc ((estimate + 1) * sizeof (*fields));
74 cmd_error (CMD_ERROR, err, "malloc failed.");
88 assert (len < estimate); \
89 fields[len] = field; \
98 for (string = buffer; *string != '\0'; string++)
100 if (isspace ((int)string[0]))
111 else if (string[0] == '"')
113 /* Note: Two consecutive quoted fields not separated by space are
114 * treated as different fields. This is the collectd 5.x behavior
115 * around splitting fields. */
119 /* end of quoted field */
120 if (! in_field) /* empty quoted string */
128 /* if (! in_field): add new field on next iteration
129 * else: quoted string following an unquoted string (one field)
130 * in either case: skip quotation mark */
133 else if ((string[0] == '\\') && in_quotes)
135 /* Outside of quotes, a backslash is a regular character (mostly
136 * for backward compatibility). */
138 if (string[1] == '\0')
141 cmd_error (CMD_PARSE_ERROR, err,
142 "Backslash at end of string.");
143 return (CMD_PARSE_ERROR);
146 /* un-escape the next character; skip backslash */
161 cmd_error (CMD_PARSE_ERROR, err, "Unterminated quoted string.");
162 return (CMD_PARSE_ERROR);
171 if (ret_fields != NULL)
172 *ret_fields = fields;
176 } /* int cmd_split */
182 void cmd_error (cmd_status_t status, cmd_error_handler_t *err,
183 const char *format, ...)
187 if ((err == NULL) || (err->cb == NULL))
190 va_start (ap, format);
191 err->cb (err->ud, status, format, ap);
193 } /* void cmd_error */
195 cmd_status_t cmd_parsev (size_t argc, char **argv,
196 cmd_t *ret_cmd, cmd_error_handler_t *err)
198 char *command = NULL;
200 if ((argc < 1) || (argv == NULL) || (ret_cmd == NULL))
203 cmd_error (CMD_ERROR, err, "Missing command.");
207 memset (ret_cmd, 0, sizeof (*ret_cmd));
209 if (strcasecmp ("PUTVAL", command) == 0)
211 ret_cmd->type = CMD_PUTVAL;
212 return cmd_parse_putval (argc - 1, argv + 1,
213 &ret_cmd->cmd.putval, err);
217 ret_cmd->type = CMD_UNKNOWN;
218 cmd_error (CMD_UNKNOWN_COMMAND, err,
219 "Unknown command `%s'.", command);
220 return (CMD_UNKNOWN_COMMAND);
224 } /* cmd_status_t cmd_parsev */
226 cmd_status_t cmd_parse (char *buffer,
227 cmd_t *ret_cmd, cmd_error_handler_t *err)
229 char **fields = NULL;
230 size_t fields_num = 0;
233 if ((status = cmd_split (buffer, &fields_num, &fields, err)) != CMD_OK)
236 status = cmd_parsev (fields_num, fields, ret_cmd, err);
239 } /* cmd_status_t cmd_parse */
241 void cmd_destroy (cmd_t *cmd)
252 cmd_destroy_putval (&cmd->cmd.putval);
255 } /* void cmd_destroy */
257 cmd_status_t cmd_parse_option (char *field,
258 char **ret_key, char **ret_value, cmd_error_handler_t *err)
265 cmd_error (CMD_ERROR, err, "Invalid argument to cmd_parse_option.");
270 /* Look for the equal sign. */
271 while (isalnum ((int)value[0]) || (value[0] == '_') || (value[0] == ':'))
273 if ((value[0] != '=') || (value == key))
275 /* Whether this is a fatal error is up to the caller. */
276 return (CMD_NO_OPTION);
283 if (ret_value != NULL)
287 } /* cmd_status_t cmd_parse_option */
289 void cmd_error_fh (void *ud, cmd_status_t status,
290 const char *format, va_list ap)
296 if (status == CMD_OK)
299 vsnprintf (buf, sizeof(buf), format, ap);
300 buf[sizeof (buf) - 1] = '\0';
301 if (fprintf (fh, "%i %s\n", code, buf) < 0)
304 WARNING ("utils_cmds: failed to write to file-handle #%i: %s",
305 fileno (fh), sstrerror (errno, errbuf, sizeof (errbuf)));
310 } /* void cmd_error_fh */
312 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */