X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Ffs.c;fp=src%2Ffs.c;h=772fa5765b03c8f219d363ac3df7172930d24e88;hp=0000000000000000000000000000000000000000;hb=9235256116574927657a93944ef1b21e255e771b;hpb=c6a15e27d934e90a1f3a26438dddb395bdc9de19

diff --git a/src/fs.c b/src/fs.c
new file mode 100644
index 00000000..772fa576
--- /dev/null
+++ b/src/fs.c
@@ -0,0 +1,142 @@
+#include "system.h"
+
+#include "fs.h"
+#include "names.h"
+#include "xalloc.h"
+
+static bool makedir(const char *path, mode_t mode) {
+	assert(path);
+
+	if(mkdir(path, mode)) {
+		if(errno == EEXIST) {
+			chmod(path, mode);
+			return true;
+		}
+
+		fprintf(stderr, "Could not create directory %s: %s\n", path, strerror(errno));
+		return false;
+	}
+
+	return true;
+}
+
+bool makedirs(tinc_dir_t dirs) {
+	if(!dirs) {
+		return false;
+	}
+
+	char path[PATH_MAX];
+	bool need_confbase = dirs & ~((unsigned)DIR_CONFDIR);
+
+	if(need_confbase && (!confbase || !makedir(confbase, 0755))) {
+		return false;
+	}
+
+	if(dirs & DIR_CONFDIR && !confbase_given && (!confdir || !makedir(confdir, 0755))) {
+		return false;
+	}
+
+	if(dirs & DIR_INVITATIONS) {
+		snprintf(path, sizeof(path), "%s" SLASH "invitations", confbase);
+
+		if(!makedir(path, 0700)) {
+			return false;
+		}
+	}
+
+	if(dirs & DIR_CACHE) {
+		snprintf(path, sizeof(path), "%s" SLASH "cache", confbase);
+
+		if(!makedir(path, 0755)) {
+			return false;
+		}
+	}
+
+	if(dirs & DIR_HOSTS) {
+		snprintf(path, sizeof(path), "%s" SLASH "hosts", confbase);
+
+		if(!makedir(path, 0755)) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+
+/* Open a file with the desired permissions, minus the umask.
+   Also, if we want to create an executable file, we call fchmod()
+   to set the executable bits. */
+
+FILE *fopenmask(const char *filename, const char *mode, mode_t perms) {
+	mode_t mask = umask(0);
+	perms &= ~mask;
+	umask(~perms & 0777);
+	FILE *f = fopen(filename, mode);
+
+	if(!f) {
+		fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno));
+		return NULL;
+	}
+
+#ifdef HAVE_FCHMOD
+
+	if(perms & 0444) {
+		fchmod(fileno(f), perms);
+	}
+
+#endif
+	umask(mask);
+	return f;
+}
+
+char *absolute_path(const char *path) {
+#ifdef HAVE_WINDOWS
+	// Works for nonexistent paths
+	return _fullpath(NULL, path, 0);
+#else
+
+	if(!path || !*path) {
+		return NULL;
+	}
+
+	// If an absolute path was passed, return its copy
+	if(*path == '/') {
+		return xstrdup(path);
+	}
+
+	// Try using realpath. If it fails for any reason
+	// other than that the file was not found, bail out.
+	char *abs = realpath(path, NULL);
+
+	if(abs || errno != ENOENT) {
+		return abs;
+	}
+
+	// Since the file does not exist, we're forced to use a fallback.
+	// Get current working directory and concatenate it with the argument.
+	char cwd[PATH_MAX];
+
+	if(!getcwd(cwd, sizeof(cwd))) {
+		return NULL;
+	}
+
+	// Remove trailing slash if present since we'll be adding our own
+	size_t cwdlen = strlen(cwd);
+
+	if(cwdlen && cwd[cwdlen - 1] == '/') {
+		cwd[cwdlen - 1] = '\0';
+	}
+
+	// We don't do any normalization because it's complicated, and the payoff is small.
+	// If user passed something like '.././../foo' — that's their choice; fopen works either way.
+	xasprintf(&abs, "%s/%s", cwd, path);
+
+	if(strlen(abs) >= PATH_MAX) {
+		free(abs);
+		abs = NULL;
+	}
+
+	return abs;
+#endif
+}