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Commit | Line | Data |
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eb67e449 VK |
1 | /* |
2 | * namespace.c | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <fcntl.h> | |
11 | #include <dirent.h> | |
ea343669 | 12 | #include <limits.h> |
eb67e449 VK |
13 | |
14 | #include "utils.h" | |
15 | #include "namespace.h" | |
16 | ||
17 | static void bind_etc(const char *name) | |
18 | { | |
ea343669 FJ |
19 | char etc_netns_path[PATH_MAX]; |
20 | char netns_name[PATH_MAX]; | |
21 | char etc_name[PATH_MAX]; | |
eb67e449 VK |
22 | struct dirent *entry; |
23 | DIR *dir; | |
24 | ||
25 | snprintf(etc_netns_path, sizeof(etc_netns_path), "%s/%s", NETNS_ETC_DIR, name); | |
26 | dir = opendir(etc_netns_path); | |
27 | if (!dir) | |
28 | return; | |
29 | ||
30 | while ((entry = readdir(dir)) != NULL) { | |
31 | if (strcmp(entry->d_name, ".") == 0) | |
32 | continue; | |
33 | if (strcmp(entry->d_name, "..") == 0) | |
34 | continue; | |
35 | snprintf(netns_name, sizeof(netns_name), "%s/%s", etc_netns_path, entry->d_name); | |
36 | snprintf(etc_name, sizeof(etc_name), "/etc/%s", entry->d_name); | |
37 | if (mount(netns_name, etc_name, "none", MS_BIND, NULL) < 0) { | |
38 | fprintf(stderr, "Bind %s -> %s failed: %s\n", | |
39 | netns_name, etc_name, strerror(errno)); | |
40 | } | |
41 | } | |
42 | closedir(dir); | |
43 | } | |
44 | ||
45 | int netns_switch(char *name) | |
46 | { | |
ea343669 | 47 | char net_path[PATH_MAX]; |
eb67e449 VK |
48 | int netns; |
49 | ||
50 | snprintf(net_path, sizeof(net_path), "%s/%s", NETNS_RUN_DIR, name); | |
51 | netns = open(net_path, O_RDONLY | O_CLOEXEC); | |
52 | if (netns < 0) { | |
53 | fprintf(stderr, "Cannot open network namespace \"%s\": %s\n", | |
54 | name, strerror(errno)); | |
55 | return -1; | |
56 | } | |
57 | ||
58 | if (setns(netns, CLONE_NEWNET) < 0) { | |
59 | fprintf(stderr, "setting the network namespace \"%s\" failed: %s\n", | |
60 | name, strerror(errno)); | |
9e5ba07f PS |
61 | close(netns); |
62 | return -1; | |
eb67e449 | 63 | } |
9e5ba07f | 64 | close(netns); |
eb67e449 VK |
65 | |
66 | if (unshare(CLONE_NEWNS) < 0) { | |
67 | fprintf(stderr, "unshare failed: %s\n", strerror(errno)); | |
9e5ba07f | 68 | return -1; |
eb67e449 VK |
69 | } |
70 | /* Don't let any mounts propagate back to the parent */ | |
71 | if (mount("", "/", "none", MS_SLAVE | MS_REC, NULL)) { | |
72 | fprintf(stderr, "\"mount --make-rslave /\" failed: %s\n", | |
73 | strerror(errno)); | |
9e5ba07f | 74 | return -1; |
eb67e449 VK |
75 | } |
76 | /* Mount a version of /sys that describes the network namespace */ | |
77 | if (umount2("/sys", MNT_DETACH) < 0) { | |
78 | fprintf(stderr, "umount of /sys failed: %s\n", strerror(errno)); | |
9e5ba07f | 79 | return -1; |
eb67e449 VK |
80 | } |
81 | if (mount(name, "/sys", "sysfs", 0, NULL) < 0) { | |
82 | fprintf(stderr, "mount of /sys failed: %s\n",strerror(errno)); | |
9e5ba07f | 83 | return -1; |
eb67e449 VK |
84 | } |
85 | ||
86 | /* Setup bind mounts for config files in /etc */ | |
87 | bind_etc(name); | |
88 | return 0; | |
89 | } | |
c3087c10 VK |
90 | |
91 | int netns_get_fd(const char *name) | |
92 | { | |
ea343669 | 93 | char pathbuf[PATH_MAX]; |
c3087c10 VK |
94 | const char *path, *ptr; |
95 | ||
96 | path = name; | |
97 | ptr = strchr(name, '/'); | |
98 | if (!ptr) { | |
99 | snprintf(pathbuf, sizeof(pathbuf), "%s/%s", | |
100 | NETNS_RUN_DIR, name ); | |
101 | path = pathbuf; | |
102 | } | |
103 | return open(path, O_RDONLY); | |
104 | } | |
e998e118 VK |
105 | |
106 | int netns_foreach(int (*func)(char *nsname, void *arg), void *arg) | |
107 | { | |
108 | DIR *dir; | |
109 | struct dirent *entry; | |
110 | ||
111 | dir = opendir(NETNS_RUN_DIR); | |
112 | if (!dir) | |
113 | return -1; | |
114 | ||
115 | while ((entry = readdir(dir)) != NULL) { | |
116 | if (strcmp(entry->d_name, ".") == 0) | |
117 | continue; | |
118 | if (strcmp(entry->d_name, "..") == 0) | |
119 | continue; | |
120 | if (func(entry->d_name, arg)) | |
121 | break; | |
122 | } | |
123 | ||
124 | closedir(dir); | |
125 | return 0; | |
126 | } |