]>
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 | ||
20 | #define _GNU_SOURCE | |
bbf5cf35 | 21 | #define __STDC_FORMAT_MACROS /* Required for PRIu64 to work. */ |
92e35018 | 22 | #include <errno.h> |
bbf5cf35 | 23 | #include <inttypes.h> |
92e35018 | 24 | #include <stdio.h> |
bbf5cf35 | 25 | #include <stdlib.h> |
92e35018 CB |
26 | #include <string.h> |
27 | #include <unistd.h> | |
28 | #include <sys/socket.h> | |
29 | #include <sys/un.h> | |
30 | ||
31 | #include "commands.h" | |
32 | #include "commands_utils.h" | |
33 | #include "log.h" | |
34 | #include "monitor.h" | |
35 | #include "state.h" | |
bbf5cf35 | 36 | #include "utils.h" |
92e35018 CB |
37 | |
38 | lxc_log_define(lxc_commands_utils, lxc); | |
39 | ||
40 | int lxc_cmd_sock_rcv_state(int state_client_fd, int timeout) | |
41 | { | |
42 | int ret; | |
43 | struct lxc_msg msg; | |
44 | struct timeval out; | |
45 | ||
46 | memset(&out, 0, sizeof(out)); | |
47 | out.tv_sec = timeout; | |
48 | ret = setsockopt(state_client_fd, SOL_SOCKET, SO_RCVTIMEO, | |
49 | (const void *)&out, sizeof(out)); | |
50 | if (ret < 0) { | |
51 | SYSERROR("Failed to set %ds timeout on containter state socket", timeout); | |
52 | return -1; | |
53 | } | |
54 | ||
55 | memset(&msg, 0, sizeof(msg)); | |
56 | ||
57 | again: | |
58 | ret = recv(state_client_fd, &msg, sizeof(msg), 0); | |
59 | if (ret < 0) { | |
60 | if (errno == EINTR) | |
61 | goto again; | |
62 | ||
63 | ERROR("failed to receive message: %s", strerror(errno)); | |
64 | return -1; | |
65 | } | |
66 | ||
67 | if (ret == 0) { | |
68 | ERROR("length of message was 0"); | |
69 | return -1; | |
70 | } | |
71 | ||
72 | TRACE("received state %s from state client %d", | |
73 | lxc_state2str(msg.value), state_client_fd); | |
74 | ||
75 | return msg.value; | |
76 | } | |
77 | ||
78 | /* Register a new state client and retrieve state from command socket. */ | |
79 | int lxc_cmd_sock_get_state(const char *name, const char *lxcpath, | |
80 | lxc_state_t states[MAX_STATE], int timeout) | |
81 | { | |
82 | int ret; | |
83 | int state_client_fd; | |
84 | ||
85 | ret = lxc_cmd_add_state_client(name, lxcpath, states, &state_client_fd); | |
86 | if (ret < 0) | |
87 | return -1; | |
88 | ||
89 | if (ret < MAX_STATE) | |
90 | return ret; | |
91 | ||
92 | ret = lxc_cmd_sock_rcv_state(state_client_fd, timeout); | |
93 | close(state_client_fd); | |
94 | return ret; | |
95 | } | |
bbf5cf35 CB |
96 | |
97 | int lxc_make_abstract_socket_name(char *path, int len, const char *lxcname, | |
98 | const char *lxcpath, | |
99 | const char *hashed_sock_name, | |
100 | const char *suffix) | |
101 | { | |
102 | const char *name; | |
103 | char *tmppath; | |
104 | size_t tmplen; | |
105 | uint64_t hash; | |
106 | int ret; | |
107 | ||
108 | name = lxcname; | |
109 | if (!name) | |
110 | name = ""; | |
111 | ||
112 | if (hashed_sock_name != NULL) { | |
113 | ret = | |
114 | snprintf(path, len, "lxc/%s/%s", hashed_sock_name, suffix); | |
115 | if (ret < 0 || ret >= len) { | |
116 | ERROR("Failed to create abstract socket name"); | |
117 | return -1; | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
122 | if (!lxcpath) { | |
123 | lxcpath = lxc_global_config_value("lxc.lxcpath"); | |
124 | if (!lxcpath) { | |
125 | ERROR("Failed to allocate memory"); | |
126 | return -1; | |
127 | } | |
128 | } | |
129 | ||
130 | ret = snprintf(path, len, "%s/%s/%s", lxcpath, name, suffix); | |
131 | if (ret < 0) { | |
132 | ERROR("Failed to create abstract socket name"); | |
133 | return -1; | |
134 | } | |
135 | if (ret < len) | |
136 | return 0; | |
137 | ||
138 | /* ret >= len; lxcpath or name is too long. hash both */ | |
139 | tmplen = strlen(name) + strlen(lxcpath) + 2; | |
140 | tmppath = alloca(tmplen); | |
141 | ret = snprintf(tmppath, tmplen, "%s/%s", lxcpath, name); | |
142 | if (ret < 0 || (size_t)ret >= tmplen) { | |
143 | ERROR("Failed to create abstract socket name"); | |
144 | return -1; | |
145 | } | |
146 | ||
147 | hash = fnv_64a_buf(tmppath, ret, FNV1A_64_INIT); | |
148 | ret = snprintf(path, len, "lxc/%016" PRIx64 "/%s", hash, suffix); | |
149 | if (ret < 0 || ret >= len) { | |
150 | ERROR("Failed to create abstract socket name"); | |
151 | return -1; | |
152 | } | |
153 | ||
154 | return 0; | |
155 | } |