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dca59f62 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
11c3a366 TA |
20 | #include <errno.h> |
21 | #include <getopt.h> | |
22 | #include <stdbool.h> | |
23 | #include <stddef.h> | |
24 | ||
25 | #include "log.h" | |
26 | #include "macro.h" | |
07630cea | 27 | #include "string-util.h" |
dca59f62 | 28 | #include "verbs.h" |
a16f96cd | 29 | #include "virt.h" |
dca59f62 LP |
30 | |
31 | int dispatch_verb(int argc, char *argv[], const Verb verbs[], void *userdata) { | |
32 | const Verb *verb; | |
33 | const char *name; | |
34 | unsigned i; | |
35 | int left; | |
36 | ||
37 | assert(verbs); | |
38 | assert(verbs[0].dispatch); | |
39 | assert(argc >= 0); | |
40 | assert(argv); | |
41 | assert(argc >= optind); | |
42 | ||
43 | left = argc - optind; | |
44 | name = argv[optind]; | |
45 | ||
46 | for (i = 0;; i++) { | |
47 | bool found; | |
48 | ||
49 | /* At the end of the list? */ | |
50 | if (!verbs[i].dispatch) { | |
51 | if (name) | |
52 | log_error("Unknown operation %s.", name); | |
53 | else | |
54 | log_error("Requires operation parameter."); | |
55 | return -EINVAL; | |
56 | } | |
57 | ||
43343ee7 | 58 | if (name) |
dca59f62 | 59 | found = streq(name, verbs[i].verb); |
43343ee7 LP |
60 | else |
61 | found = !!(verbs[i].flags & VERB_DEFAULT); | |
dca59f62 LP |
62 | |
63 | if (found) { | |
64 | verb = &verbs[i]; | |
65 | break; | |
66 | } | |
67 | } | |
68 | ||
43343ee7 LP |
69 | assert(verb); |
70 | ||
71 | if (!name) | |
72 | left = 1; | |
73 | ||
dca59f62 LP |
74 | if (verb->min_args != VERB_ANY && |
75 | (unsigned) left < verb->min_args) { | |
76 | log_error("Too few arguments."); | |
77 | return -EINVAL; | |
78 | } | |
79 | ||
80 | if (verb->max_args != VERB_ANY && | |
81 | (unsigned) left > verb->max_args) { | |
540d8581 | 82 | log_error("Too many arguments."); |
dca59f62 LP |
83 | return -EINVAL; |
84 | } | |
85 | ||
a16f96cd LP |
86 | if ((verb->flags & VERB_NOCHROOT) && running_in_chroot() > 0) { |
87 | log_info("Running in chroot, ignoring request."); | |
88 | return 0; | |
89 | } | |
90 | ||
43343ee7 LP |
91 | if (name) |
92 | return verb->dispatch(left, argv + optind, userdata); | |
93 | else { | |
94 | char* fake[2] = { | |
95 | (char*) verb->verb, | |
96 | NULL | |
97 | }; | |
98 | ||
99 | return verb->dispatch(1, fake, userdata); | |
100 | } | |
dca59f62 | 101 | } |