| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | #include "run_dir.h" |
| 4 | #include "libnetdata/libnetdata.h" |
| 5 | |
| 6 | static char *cached_run_dir = NULL; |
| 7 | static SPINLOCK spinlock = SPINLOCK_INITIALIZER; |
| 8 | |
| 9 | static inline bool is_dir_accessible(const char *dir, bool rw) { |
| 10 | struct stat st; |
| 11 | if (stat(dir, &st) == -1) |
| 12 | return false; |
| 13 | |
| 14 | if (!S_ISDIR(st.st_mode)) |
| 15 | return false; |
| 16 | |
| 17 | // Check if we can write to the directory |
| 18 | if (access(dir, rw ? W_OK : R_OK) == -1) |
| 19 | return false; |
| 20 | |
| 21 | return true; |
| 22 | } |
| 23 | |
| 24 | static inline bool netdata_dir_in_parent(const char *parent, char *out_path, size_t out_path_len, bool rw) { |
| 25 | if (!is_dir_accessible(parent, rw)) |
| 26 | return false; |
| 27 | |
| 28 | snprintfz(out_path, out_path_len, "%s/netdata", parent); |
| 29 | if (mkdir(out_path, 0755) == -1 && errno != EEXIST) |
| 30 | return false; |
| 31 | |
| 32 | return is_dir_accessible(out_path, rw); |
| 33 | } |
| 34 | |
| 35 | static char *detect_run_dir(bool rw) { |
| 36 | char path[FILENAME_MAX + 1]; |
| 37 | |
| 38 | if(!rw) { |
| 39 | // First check for environment variable |
| 40 | const char *env_dir = getenv("NETDATA_RUN_DIR"); |
| 41 | if (env_dir && *env_dir) { |
| 42 | if (is_dir_accessible(env_dir, rw)) |
| 43 | return strdupz(env_dir); |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | #if defined(OS_LINUX) |
| 48 | // First try /run/netdata |
| 49 | if (netdata_dir_in_parent("/run", path, sizeof(path), rw)) |
| 50 | goto success; |
| 51 | #endif |
| 52 | |
| 53 | #if defined(OS_MACOS) |
| 54 | // macOS typically uses /private/var/run |
| 55 | if (netdata_dir_in_parent("/private/var/run", path, sizeof(path), rw)) |
| 56 | goto success; |
| 57 | #endif |
| 58 | |
| 59 | #if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_MACOS) |
| 60 | // Then try /var/run/netdata |
| 61 | if (netdata_dir_in_parent("/var/run", path, sizeof(path), rw)) |
| 62 | goto success; |
| 63 | #endif |
| 64 | |
| 65 | //#if defined(OS_WINDOWS) |
| 66 | // // On MSYS2/Cygwin get TEMP and convert it properly |
| 67 | // WCHAR temp_pathW[MAX_PATH]; |
| 68 | // DWORD len = GetEnvironmentVariableW(L"TEMP", temp_pathW, MAX_PATH); |
| 69 | // if (len > 0 && len < MAX_PATH) { |
| 70 | // // Convert Windows wide path to UTF-8 |
| 71 | // int utf8_len = WideCharToMultiByte(CP_UTF8, 0, temp_pathW, -1, NULL, 0, NULL, NULL); |
| 72 | // if (utf8_len > 0 && utf8_len < FILENAME_MAX) { |
| 73 | // char win_path[FILENAME_MAX + 1]; |
| 74 | // if (WideCharToMultiByte(CP_UTF8, 0, temp_pathW, -1, win_path, sizeof(win_path), NULL, NULL)) { |
| 75 | // // Convert Windows path to Unix path using Cygwin API |
| 76 | // ssize_t unix_size = cygwin_conv_path(CCP_WIN_A_TO_POSIX, win_path, NULL, 0); |
| 77 | // if (unix_size > 0) { |
| 78 | // char unix_path[FILENAME_MAX + 1]; |
| 79 | // if (cygwin_conv_path(CCP_WIN_A_TO_POSIX, win_path, unix_path, sizeof(unix_path)) == 0) { |
| 80 | // if (is_dir_accessible(unix_path, rw)) { |
| 81 | // snprintfz(path, sizeof(path), "%s/netdata", unix_path); |
| 82 | // if (!rw) |
| 83 | // goto success; |
| 84 | // |
| 85 | // if (mkdir(path, 0755) == 0 || errno == EEXIST) |
| 86 | // goto success; |
| 87 | // } |
| 88 | // } |
| 89 | // } |
| 90 | // } |
| 91 | // } |
| 92 | // } |
| 93 | //#endif |
| 94 | |
| 95 | // Fallback to /tmp/netdata - force creation if needed |
| 96 | if (!is_dir_accessible("/tmp", rw)) { |
| 97 | // Try to create /tmp with standard permissions (including sticky bit) |
| 98 | if (rw && mkdir("/tmp", 01777) == -1 && errno != EEXIST) |
| 99 | return NULL; |
| 100 | } |
| 101 | |
| 102 | snprintfz(path, sizeof(path), "/tmp/netdata"); |
| 103 | if (rw && mkdir(path, 0755) == -1 && errno != EEXIST) |
| 104 | return NULL; |
| 105 | |
| 106 | success: |
| 107 | // Set the environment variable for child processes |
| 108 | if(rw) |
| 109 | nd_setenv("NETDATA_RUN_DIR", path, 1); |
| 110 | |
| 111 | return strdupz(path); |
| 112 | } |
| 113 | |
| 114 | const char *os_run_dir(bool rw) { |
| 115 | // Fast path - return cached directory if available |
| 116 | if(cached_run_dir) |
| 117 | return cached_run_dir; |
| 118 | |
| 119 | spinlock_lock(&spinlock); |
| 120 | |
| 121 | // Check again under lock in case another thread set it |
| 122 | if(!cached_run_dir) |
| 123 | cached_run_dir = detect_run_dir(rw); |
| 124 | |
| 125 | spinlock_unlock(&spinlock); |
| 126 | |
| 127 | errno_clear(); |
| 128 | return cached_run_dir; |
| 129 | } |