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