summaryrefslogtreecommitdiff
path: root/src/escape/escape.c
blob: 9390558554eae1915040708a0e504581b08d5bc6 (plain)
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
234
235
236
237
238
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2014 Michael Biebl

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>

#include "log.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"

static enum {
        ACTION_ESCAPE,
        ACTION_UNESCAPE,
        ACTION_MANGLE
} arg_action = ACTION_ESCAPE;
static const char *arg_suffix = NULL;
static const char *arg_template = NULL;
static bool arg_path = false;

static void help(void) {
        printf("%s [OPTIONS...] [NAME...]\n\n"
               "Show system and user paths.\n\n"
               "  -h --help               Show this help\n"
               "     --version            Show package version\n"
               "     --suffix=SUFFIX      Unit suffix to append to escaped strings\n"
               "     --template=TEMPLATE  Insert strings as instance into template\n"
               "  -u --unescape           Unescape strings\n"
               "  -m --mangle             Mangle strings\n"
               "  -p --path               When escaping/unescaping assume the string is a path\n"
               , program_invocation_short_name);
}

static int parse_argv(int argc, char *argv[]) {

        enum {
                ARG_VERSION = 0x100,
                ARG_SUFFIX,
                ARG_TEMPLATE
        };

        static const struct option options[] = {
                { "help",      no_argument,       NULL, 'h'           },
                { "version",   no_argument,       NULL, ARG_VERSION   },
                { "suffix",    required_argument, NULL, ARG_SUFFIX    },
                { "template",  required_argument, NULL, ARG_TEMPLATE  },
                { "unescape",  no_argument,       NULL, 'u'           },
                { "mangle",    no_argument,       NULL, 'm'           },
                { "path",      no_argument,       NULL, 'p'           },
                {}
        };

        int c;

        assert(argc >= 0);
        assert(argv);

        while ((c = getopt_long(argc, argv, "hump", options, NULL)) >= 0)

                switch (c) {

                case 'h':
                        help();
                        return 0;

                case ARG_VERSION:
                        return version();

                case ARG_SUFFIX:

                        if (unit_type_from_string(optarg) < 0) {
                                log_error("Invalid unit suffix type %s.", optarg);
                                return -EINVAL;
                        }

                        arg_suffix = optarg;
                        break;

                case ARG_TEMPLATE:

                        if (!unit_name_is_valid(optarg, UNIT_NAME_TEMPLATE)) {
                                log_error("Template name %s is not valid.", optarg);
                                return -EINVAL;
                        }

                        arg_template = optarg;
                        break;

                case 'u':
                        arg_action = ACTION_UNESCAPE;
                        break;

                case 'm':
                        arg_action = ACTION_MANGLE;
                        break;

                case 'p':
                        arg_path = true;
                        break;

                case '?':
                        return -EINVAL;

                default:
                        assert_not_reached("Unhandled option");
                }

        if (optind >= argc) {
                log_error("Not enough arguments.");
                return -EINVAL;
        }

        if (arg_template && arg_suffix) {
                log_error("--suffix= and --template= may not be combined.");
                return -EINVAL;
        }

        if ((arg_template || arg_suffix) && arg_action != ACTION_ESCAPE) {
                log_error("--suffix= and --template= are not compatible with --unescape or --mangle.");
                return -EINVAL;
        }

        if (arg_path && !IN_SET(arg_action, ACTION_ESCAPE, ACTION_UNESCAPE)) {
                log_error("--path may not be combined with --mangle.");
                return -EINVAL;
        }

        return 1;
}

int main(int argc, char *argv[]) {
        char **i;
        int r;

        log_parse_environment();
        log_open();

        r = parse_argv(argc, argv);
        if (r <= 0)
                goto finish;

        STRV_FOREACH(i, argv + optind) {
                _cleanup_free_ char *e = NULL;

                switch (arg_action) {

                case ACTION_ESCAPE:
                        if (arg_path) {
                                r = unit_name_path_escape(*i, &e);
                                if (r < 0) {
                                        log_error_errno(r, "Failed to escape string: %m");
                                        goto finish;
                                }
                        } else {
                                e = unit_name_escape(*i);
                                if (!e) {
                                        r = log_oom();
                                        goto finish;
                                }
                        }

                        if (arg_template) {
                                char *x;

                                r = unit_name_replace_instance(arg_template, e, &x);
                                if (r < 0) {
                                        log_error_errno(r, "Failed to replace instance: %m");
                                        goto finish;
                                }

                                free(e);
                                e = x;
                        } else if (arg_suffix) {
                                char *x;

                                x = strjoin(e, ".", arg_suffix, NULL);
                                if (!x) {
                                        r = log_oom();
                                        goto finish;
                                }

                                free(e);
                                e = x;
                        }

                        break;

                case ACTION_UNESCAPE:
                        if (arg_path)
                                r = unit_name_path_unescape(*i, &e);
                        else
                                r = unit_name_unescape(*i, &e);

                        if (r < 0) {
                                log_error_errno(r, "Failed to unescape string: %m");
                                goto finish;
                        }
                        break;

                case ACTION_MANGLE:
                        r = unit_name_mangle(*i, UNIT_NAME_NOGLOB, &e);
                        if (r < 0) {
                                log_error_errno(r, "Failed to mangle name: %m");
                                goto finish;
                        }
                        break;
                }

                if (i != argv+optind)
                        fputc(' ', stdout);

                fputs(e, stdout);
        }

        fputc('\n', stdout);

finish:
        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}