]>
Commit | Line | Data |
---|---|---|
92e35018 CB |
1 | /* liblxcapi |
2 | * | |
3 | * Copyright © 2017 Christian Brauner <christian.brauner@ubuntu.com>. | |
4 | * Copyright © 2017 Canonical Ltd. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2, as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
d38dd64a CB |
20 | #ifndef _GNU_SOURCE |
21 | #define _GNU_SOURCE 1 | |
22 | #endif | |
bbf5cf35 | 23 | #define __STDC_FORMAT_MACROS /* Required for PRIu64 to work. */ |
92e35018 | 24 | #include <errno.h> |
bbf5cf35 | 25 | #include <inttypes.h> |
92e35018 | 26 | #include <stdio.h> |
bbf5cf35 | 27 | #include <stdlib.h> |
92e35018 | 28 | #include <string.h> |
92e35018 CB |
29 | #include <sys/socket.h> |
30 | #include <sys/un.h> | |
d38dd64a | 31 | #include <unistd.h> |
92e35018 | 32 | |
c01c2be6 | 33 | #include "af_unix.h" |
92e35018 CB |
34 | #include "commands.h" |
35 | #include "commands_utils.h" | |
d38dd64a | 36 | #include "config.h" |
e3233f26 | 37 | #include "file_utils.h" |
d38dd64a | 38 | #include "initutils.h" |
92e35018 | 39 | #include "log.h" |
f3a2945e | 40 | #include "lxclock.h" |
92e35018 CB |
41 | #include "monitor.h" |
42 | #include "state.h" | |
bbf5cf35 | 43 | #include "utils.h" |
92e35018 | 44 | |
ac2cecc4 | 45 | lxc_log_define(commands_utils, lxc); |
92e35018 CB |
46 | |
47 | int lxc_cmd_sock_rcv_state(int state_client_fd, int timeout) | |
48 | { | |
49 | int ret; | |
50 | struct lxc_msg msg; | |
51 | struct timeval out; | |
52 | ||
ee8377bd CB |
53 | if (timeout >= 0) { |
54 | memset(&out, 0, sizeof(out)); | |
55 | out.tv_sec = timeout; | |
56 | ret = setsockopt(state_client_fd, SOL_SOCKET, SO_RCVTIMEO, | |
57 | (const void *)&out, sizeof(out)); | |
58 | if (ret < 0) { | |
e01516d7 | 59 | SYSERROR("Failed to set %ds timeout on container " |
ee8377bd CB |
60 | "state socket", |
61 | timeout); | |
62 | return -1; | |
63 | } | |
92e35018 CB |
64 | } |
65 | ||
66 | memset(&msg, 0, sizeof(msg)); | |
67 | ||
e3233f26 | 68 | ret = lxc_recv_nointr(state_client_fd, &msg, sizeof(msg), 0); |
92e35018 | 69 | if (ret < 0) { |
6d1400b5 | 70 | SYSERROR("Failed to receive message"); |
92e35018 CB |
71 | return -1; |
72 | } | |
73 | ||
9dfa4041 | 74 | TRACE("Received state %s from state client %d", |
92e35018 CB |
75 | lxc_state2str(msg.value), state_client_fd); |
76 | ||
77 | return msg.value; | |
78 | } | |
79 | ||
80 | /* Register a new state client and retrieve state from command socket. */ | |
81 | int lxc_cmd_sock_get_state(const char *name, const char *lxcpath, | |
82 | lxc_state_t states[MAX_STATE], int timeout) | |
83 | { | |
84 | int ret; | |
85 | int state_client_fd; | |
86 | ||
87 | ret = lxc_cmd_add_state_client(name, lxcpath, states, &state_client_fd); | |
88 | if (ret < 0) | |
89 | return -1; | |
90 | ||
91 | if (ret < MAX_STATE) | |
92 | return ret; | |
93 | ||
94 | ret = lxc_cmd_sock_rcv_state(state_client_fd, timeout); | |
95 | close(state_client_fd); | |
96 | return ret; | |
97 | } | |
bbf5cf35 | 98 | |
5b46db1a | 99 | int lxc_make_abstract_socket_name(char *path, size_t pathlen, |
100 | const char *lxcname, | |
bbf5cf35 CB |
101 | const char *lxcpath, |
102 | const char *hashed_sock_name, | |
103 | const char *suffix) | |
104 | { | |
105 | const char *name; | |
5b46db1a | 106 | char *offset; |
bbf5cf35 | 107 | char *tmppath; |
5b46db1a | 108 | size_t len; |
bbf5cf35 CB |
109 | size_t tmplen; |
110 | uint64_t hash; | |
111 | int ret; | |
112 | ||
5b46db1a | 113 | if (!path) |
114 | return -1; | |
115 | ||
116 | offset = &path[1]; | |
117 | ||
118 | /* -2 here because this is an abstract unix socket so it needs a | |
119 | * leading \0, and we null terminate, so it needs a trailing \0. | |
120 | * Although null termination isn't required by the API, we do it anyway | |
121 | * because we print the sockname out sometimes. | |
122 | */ | |
47903908 | 123 | len = pathlen - 2; |
5b46db1a | 124 | |
bbf5cf35 CB |
125 | name = lxcname; |
126 | if (!name) | |
127 | name = ""; | |
128 | ||
129 | if (hashed_sock_name != NULL) { | |
5b46db1a | 130 | ret = snprintf(offset, len, "lxc/%s/%s", hashed_sock_name, suffix); |
bbf5cf35 CB |
131 | if (ret < 0 || ret >= len) { |
132 | ERROR("Failed to create abstract socket name"); | |
133 | return -1; | |
134 | } | |
135 | return 0; | |
136 | } | |
137 | ||
138 | if (!lxcpath) { | |
139 | lxcpath = lxc_global_config_value("lxc.lxcpath"); | |
140 | if (!lxcpath) { | |
141 | ERROR("Failed to allocate memory"); | |
142 | return -1; | |
143 | } | |
144 | } | |
145 | ||
5b46db1a | 146 | ret = snprintf(offset, len, "%s/%s/%s", lxcpath, name, suffix); |
bbf5cf35 CB |
147 | if (ret < 0) { |
148 | ERROR("Failed to create abstract socket name"); | |
149 | return -1; | |
150 | } | |
151 | if (ret < len) | |
152 | return 0; | |
153 | ||
154 | /* ret >= len; lxcpath or name is too long. hash both */ | |
155 | tmplen = strlen(name) + strlen(lxcpath) + 2; | |
156 | tmppath = alloca(tmplen); | |
157 | ret = snprintf(tmppath, tmplen, "%s/%s", lxcpath, name); | |
158 | if (ret < 0 || (size_t)ret >= tmplen) { | |
159 | ERROR("Failed to create abstract socket name"); | |
160 | return -1; | |
161 | } | |
162 | ||
163 | hash = fnv_64a_buf(tmppath, ret, FNV1A_64_INIT); | |
5b46db1a | 164 | ret = snprintf(offset, len, "lxc/%016" PRIx64 "/%s", hash, suffix); |
bbf5cf35 CB |
165 | if (ret < 0 || ret >= len) { |
166 | ERROR("Failed to create abstract socket name"); | |
167 | return -1; | |
168 | } | |
169 | ||
170 | return 0; | |
171 | } | |
c01c2be6 CB |
172 | |
173 | int lxc_cmd_connect(const char *name, const char *lxcpath, | |
9dfa4041 | 174 | const char *hashed_sock_name, const char *suffix) |
c01c2be6 CB |
175 | { |
176 | int ret, client_fd; | |
b1234129 | 177 | char path[LXC_AUDS_ADDR_LEN] = {0}; |
c01c2be6 | 178 | |
5b46db1a | 179 | ret = lxc_make_abstract_socket_name(path, sizeof(path), name, lxcpath, |
9dfa4041 | 180 | hashed_sock_name, suffix); |
c01c2be6 CB |
181 | if (ret < 0) |
182 | return -1; | |
183 | ||
184 | /* Get new client fd. */ | |
185 | client_fd = lxc_abstract_unix_connect(path); | |
2a850b2c | 186 | if (client_fd < 0) |
c01c2be6 | 187 | return -1; |
c01c2be6 CB |
188 | |
189 | return client_fd; | |
190 | } | |
191 | ||
192 | int lxc_add_state_client(int state_client_fd, struct lxc_handler *handler, | |
193 | lxc_state_t states[MAX_STATE]) | |
194 | { | |
bc631984 | 195 | int state; |
d39b10eb | 196 | struct lxc_state_client *newclient; |
c01c2be6 CB |
197 | struct lxc_list *tmplist; |
198 | ||
199 | newclient = malloc(sizeof(*newclient)); | |
200 | if (!newclient) | |
201 | return -ENOMEM; | |
202 | ||
203 | /* copy requested states */ | |
204 | memcpy(newclient->states, states, sizeof(newclient->states)); | |
205 | newclient->clientfd = state_client_fd; | |
206 | ||
207 | tmplist = malloc(sizeof(*tmplist)); | |
208 | if (!tmplist) { | |
209 | free(newclient); | |
210 | return -ENOMEM; | |
211 | } | |
212 | ||
bc631984 CB |
213 | state = handler->state; |
214 | if (states[state] != 1) { | |
215 | lxc_list_add_elem(tmplist, newclient); | |
216 | lxc_list_add_tail(&handler->conf->state_clients, tmplist); | |
bc631984 | 217 | } else { |
bc631984 | 218 | free(newclient); |
44552fb2 | 219 | free(tmplist); |
bc631984 CB |
220 | return state; |
221 | } | |
c01c2be6 | 222 | |
47903908 | 223 | TRACE("Added state client %d to state client list", state_client_fd); |
bc631984 | 224 | return MAX_STATE; |
c01c2be6 | 225 | } |