X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Futils.c;h=d0d106279268a3efb183fd2eeee386b2bf0b554f;hb=7208397398f7e08d741bfa83594a88e5d01b6220;hp=c9f3085a4d1586ac799061f69fdf5cc0b68f484c;hpb=ddabda536acf33abbfef28bc199d2b3ae7219b46;p=tinc

diff --git a/src/utils.c b/src/utils.c
index c9f3085a..d0d10627 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -54,7 +54,7 @@ static int charhex2bin(char c) {
 }
 
 size_t hex2bin(const char *src, void *vdst, size_t length) {
-	char *dst = vdst;
+	uint8_t *dst = vdst;
 	size_t i;
 
 	for(i = 0; i < length && isxdigit(src[i * 2]) && isxdigit(src[i * 2 + 1]); i++) {
@@ -67,7 +67,8 @@ size_t hex2bin(const char *src, void *vdst, size_t length) {
 size_t bin2hex(const void *vsrc, char *dst, size_t length) {
 	const char *src = vsrc;
 
-	for(size_t i = length; i-- > 0;) {
+	for(size_t i = length; i > 0;) {
+		--i;
 		dst[i * 2 + 1] = hexadecimals[(unsigned char) src[i] & 15];
 		dst[i * 2] = hexadecimals[(unsigned char) src[i] >> 4];
 	}
@@ -283,3 +284,30 @@ char *replace_name(const char *name) {
 
 	return ret_name;
 }
+
+/* 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) && f) {
+		fchmod(fileno(f), perms);
+	}
+
+#endif
+	umask(mask);
+	return f;
+}
+