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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | Copyright 2013 Daniel Mack | |
8 | Copyright 2014 Kay Sievers | |
9 | ||
10 | systemd is free software; you can redistribute it and/or modify it | |
11 | under the terms of the GNU Lesser General Public License as published by | |
12 | the Free Software Foundation; either version 2.1 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | systemd is distributed in the hope that it will be useful, but | |
16 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | Lesser General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU Lesser General Public License | |
21 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
22 | ***/ | |
23 | ||
24 | #include <sys/types.h> | |
25 | #include <unistd.h> | |
26 | #include <string.h> | |
27 | #include <errno.h> | |
28 | #include <stddef.h> | |
29 | ||
30 | #include "log.h" | |
31 | #include "util.h" | |
32 | #include "sd-bus.h" | |
33 | #include "bus-internal.h" | |
34 | #include "bus-message.h" | |
35 | #include "bus-util.h" | |
36 | #include "strv.h" | |
37 | #include "def.h" | |
38 | #include "bus-control.h" | |
39 | #include "synthesize.h" | |
40 | ||
41 | static int synthetic_driver_send(sd_bus *b, sd_bus_message *m) { | |
42 | int r; | |
43 | ||
44 | assert(b); | |
45 | assert(m); | |
46 | ||
47 | r = bus_message_append_sender(m, "org.freedesktop.DBus"); | |
48 | if (r < 0) | |
49 | return r; | |
50 | ||
51 | r = bus_seal_synthetic_message(b, m); | |
52 | if (r < 0) | |
53 | return r; | |
54 | ||
55 | return sd_bus_send(b, m, NULL); | |
56 | } | |
57 | ||
58 | int synthetic_reply_method_error(sd_bus_message *call, const sd_bus_error *e) { | |
59 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
60 | int r; | |
61 | ||
62 | assert(call); | |
63 | ||
64 | if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) | |
65 | return 0; | |
66 | ||
67 | r = sd_bus_message_new_method_error(call, &m, e); | |
68 | if (r < 0) | |
69 | return r; | |
70 | ||
71 | return synthetic_driver_send(call->bus, m); | |
72 | } | |
73 | ||
74 | int synthetic_reply_method_errorf(sd_bus_message *call, const char *name, const char *format, ...) { | |
75 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
76 | va_list ap; | |
77 | ||
78 | va_start(ap, format); | |
79 | bus_error_setfv(&error, name, format, ap); | |
80 | va_end(ap); | |
81 | ||
82 | return synthetic_reply_method_error(call, &error); | |
83 | } | |
84 | ||
85 | int synthetic_reply_method_errno(sd_bus_message *call, int error, const sd_bus_error *p) { | |
86 | ||
87 | _cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL; | |
88 | ||
89 | assert(call); | |
90 | ||
91 | if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) | |
92 | return 0; | |
93 | ||
94 | if (sd_bus_error_is_set(p)) | |
95 | return synthetic_reply_method_error(call, p); | |
96 | ||
97 | sd_bus_error_set_errno(&berror, error); | |
98 | ||
99 | return synthetic_reply_method_error(call, &berror); | |
100 | } | |
101 | ||
102 | int synthetic_reply_method_return(sd_bus_message *call, const char *types, ...) { | |
103 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
104 | int r; | |
105 | ||
106 | assert(call); | |
107 | ||
108 | if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) | |
109 | return 0; | |
110 | ||
111 | r = sd_bus_message_new_method_return(call, &m); | |
112 | if (r < 0) | |
113 | return r; | |
114 | ||
115 | if (!isempty(types)) { | |
116 | va_list ap; | |
117 | ||
118 | va_start(ap, types); | |
119 | r = bus_message_append_ap(m, types, ap); | |
120 | va_end(ap); | |
121 | if (r < 0) | |
122 | return r; | |
123 | } | |
124 | ||
125 | return synthetic_driver_send(call->bus, m); | |
126 | } | |
127 | ||
1433efd2 | 128 | int synthetic_reply_method_return_strv(sd_bus_message *call, char **l) { |
f3c47246 DM |
129 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
130 | int r; | |
131 | ||
132 | assert(call); | |
133 | ||
134 | if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) | |
135 | return 0; | |
136 | ||
137 | r = sd_bus_message_new_method_return(call, &m); | |
138 | if (r < 0) | |
139 | return synthetic_reply_method_errno(call, r, NULL); | |
140 | ||
141 | r = sd_bus_message_append_strv(m, l); | |
142 | if (r < 0) | |
143 | return synthetic_reply_method_errno(call, r, NULL); | |
144 | ||
145 | return synthetic_driver_send(call->bus, m); | |
146 | } | |
5e2de0eb DM |
147 | |
148 | int synthesize_name_acquired(sd_bus *a, sd_bus *b, sd_bus_message *m) { | |
149 | _cleanup_bus_message_unref_ sd_bus_message *n = NULL; | |
150 | const char *name, *old_owner, *new_owner; | |
151 | int r; | |
152 | ||
153 | assert(a); | |
154 | assert(b); | |
155 | assert(m); | |
156 | ||
157 | /* If we get NameOwnerChanged for our own name, we need to | |
158 | * synthesize NameLost/NameAcquired, since socket clients need | |
159 | * that, even though it is obsoleted on kdbus */ | |
160 | ||
161 | if (!a->is_kernel) | |
162 | return 0; | |
163 | ||
164 | if (!sd_bus_message_is_signal(m, "org.freedesktop.DBus", "NameOwnerChanged") || | |
165 | !streq_ptr(m->path, "/org/freedesktop/DBus") || | |
166 | !streq_ptr(m->sender, "org.freedesktop.DBus")) | |
167 | return 0; | |
168 | ||
169 | r = sd_bus_message_read(m, "sss", &name, &old_owner, &new_owner); | |
170 | if (r < 0) | |
171 | return r; | |
172 | ||
173 | r = sd_bus_message_rewind(m, true); | |
174 | if (r < 0) | |
175 | return r; | |
176 | ||
177 | if (streq(old_owner, a->unique_name)) { | |
178 | ||
179 | r = sd_bus_message_new_signal( | |
180 | b, | |
181 | &n, | |
182 | "/org/freedesktop/DBus", | |
183 | "org.freedesktop.DBus", | |
184 | "NameLost"); | |
185 | ||
186 | } else if (streq(new_owner, a->unique_name)) { | |
187 | ||
188 | r = sd_bus_message_new_signal( | |
189 | b, | |
190 | &n, | |
191 | "/org/freedesktop/DBus", | |
192 | "org.freedesktop.DBus", | |
193 | "NameAcquired"); | |
194 | } else | |
195 | return 0; | |
196 | ||
197 | if (r < 0) | |
198 | return r; | |
199 | ||
200 | r = sd_bus_message_append(n, "s", name); | |
201 | if (r < 0) | |
202 | return r; | |
203 | ||
204 | r = bus_message_append_sender(n, "org.freedesktop.DBus"); | |
205 | if (r < 0) | |
206 | return r; | |
207 | ||
208 | r = bus_seal_synthetic_message(b, n); | |
209 | if (r < 0) | |
210 | return r; | |
211 | ||
212 | return sd_bus_send(b, n, NULL); | |
213 | } |