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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
88a60da0 | 2 | |
521251d2 MG |
3 | #include <errno.h> |
4 | #include <fcntl.h> | |
3f6fd1ba | 5 | #include <stdio.h> |
521251d2 | 6 | #include <unistd.h> |
88a60da0 | 7 | |
521251d2 | 8 | #include "fd-util.h" |
3f6fd1ba | 9 | #include "fileio.h" |
88a60da0 | 10 | #include "log.h" |
a8fbdf54 | 11 | #include "macro.h" |
07630cea | 12 | #include "string-util.h" |
88a60da0 KS |
13 | #include "sysctl-util.h" |
14 | ||
15 | char *sysctl_normalize(char *s) { | |
16 | char *n; | |
17 | ||
18 | n = strpbrk(s, "/."); | |
19 | /* If the first separator is a slash, the path is | |
20 | * assumed to be normalized and slashes remain slashes | |
21 | * and dots remains dots. */ | |
22 | if (!n || *n == '/') | |
23 | return s; | |
24 | ||
25 | /* Otherwise, dots become slashes and slashes become | |
26 | * dots. Fun. */ | |
27 | while (n) { | |
28 | if (*n == '.') | |
29 | *n = '/'; | |
30 | else | |
31 | *n = '.'; | |
32 | ||
33 | n = strpbrk(n + 1, "/."); | |
34 | } | |
35 | ||
36 | return s; | |
37 | } | |
38 | ||
39 | int sysctl_write(const char *property, const char *value) { | |
0f5a8be5 | 40 | char *p; |
521251d2 | 41 | _cleanup_close_ int fd = -1; |
88a60da0 | 42 | |
0f5a8be5 LP |
43 | assert(property); |
44 | assert(value); | |
88a60da0 | 45 | |
ca64ce4a | 46 | log_debug("Setting '%s' to '%.*s'.", property, (int) strcspn(value, NEWLINE), value); |
88a60da0 | 47 | |
0f5a8be5 | 48 | p = strjoina("/proc/sys/", property); |
521251d2 MG |
49 | fd = open(p, O_WRONLY|O_CLOEXEC); |
50 | if (fd < 0) | |
51 | return -errno; | |
52 | ||
53 | if (!endswith(value, "\n")) | |
54 | value = strjoina(value, "\n"); | |
55 | ||
56 | if (write(fd, value, strlen(value)) < 0) | |
57 | return -errno; | |
58 | ||
59 | return 0; | |
88a60da0 KS |
60 | } |
61 | ||
6a47f2a7 LP |
62 | int sysctl_writef(const char *property, const char *format, ...) { |
63 | _cleanup_free_ char *v = NULL; | |
64 | va_list ap; | |
65 | int r; | |
66 | ||
67 | va_start(ap, format); | |
68 | r = vasprintf(&v, format, ap); | |
69 | va_end(ap); | |
70 | ||
71 | if (r < 0) | |
72 | return -ENOMEM; | |
73 | ||
74 | return sysctl_write(property, v); | |
75 | } | |
76 | ||
3decde02 YW |
77 | int sysctl_write_ip_property(int af, const char *ifname, const char *property, const char *value) { |
78 | const char *p; | |
79 | ||
80 | assert(IN_SET(af, AF_INET, AF_INET6)); | |
81 | assert(property); | |
82 | assert(value); | |
83 | ||
84 | p = strjoina("/proc/sys/net/ipv", af == AF_INET ? "4" : "6", | |
85 | ifname ? "/conf/" : "", strempty(ifname), | |
86 | property[0] == '/' ? "" : "/", property); | |
87 | ||
88 | log_debug("Setting '%s' to '%s'", p, value); | |
89 | ||
90 | return write_string_file(p, value, WRITE_STRING_FILE_VERIFY_ON_FAILURE | WRITE_STRING_FILE_DISABLE_BUFFER); | |
91 | } | |
92 | ||
88a60da0 | 93 | int sysctl_read(const char *property, char **content) { |
0f5a8be5 | 94 | char *p; |
88a60da0 | 95 | |
0f5a8be5 LP |
96 | assert(property); |
97 | assert(content); | |
88a60da0 | 98 | |
0f5a8be5 | 99 | p = strjoina("/proc/sys/", property); |
88a60da0 KS |
100 | return read_full_file(p, content, NULL); |
101 | } | |
a6b3b0aa YW |
102 | |
103 | int sysctl_read_ip_property(int af, const char *ifname, const char *property, char **ret) { | |
104 | _cleanup_free_ char *value = NULL; | |
105 | const char *p; | |
106 | int r; | |
107 | ||
108 | assert(IN_SET(af, AF_INET, AF_INET6)); | |
109 | assert(property); | |
110 | ||
111 | p = strjoina("/proc/sys/net/ipv", af == AF_INET ? "4" : "6", | |
112 | ifname ? "/conf/" : "", strempty(ifname), | |
113 | property[0] == '/' ? "" : "/", property); | |
114 | ||
115 | r = read_one_line_file(p, &value); | |
116 | if (r < 0) | |
117 | return r; | |
118 | ||
119 | if (ret) | |
120 | *ret = TAKE_PTR(value); | |
121 | ||
122 | return r; | |
123 | } |