initialize rand seed with nano-second granularity

in scenarios where one is to spin up several processes with the same
proxy list in random mode, all processes started in the same second
would pick the same proxy due to using the same srand() seed.

closes #380

2 files changed, 14 insertions, 1 deletions

diff --git a/configure b/configure
index 1e9ca3f..8b21b97 100755
--- a/configure
+++ b/configure
@@ -165,6 +165,9 @@ check_compile 'whether we have pipe2() and O_CLOEXEC' "-DHAVE_PIPE2" \
 check_compile 'whether we have SOCK_CLOEXEC' "-DHAVE_SOCK_CLOEXEC" \
 '#define _GNU_SOURCE\n#include <sys/socket.h>\nint main() {\nreturn socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0);}'
 
+check_compile 'whether we have clock_gettime' "-DHAVE_CLOCK_GETTIME" \
+'#define _GNU_SOURCE\n#include <time.h>\nint main() {\nstruct timespec now;clock_gettime(CLOCK_REALTIME, &now);\nreturn now.tv_sec ^ now.tv_nsec;}'
+
 check_define __APPLE__ && {
 	mac_detected=true
 	check_define __x86_64__ && mac_64=true
diff --git a/src/libproxychains.c b/src/libproxychains.c
index a3509c9..b67ce83 100644
--- a/src/libproxychains.c
+++ b/src/libproxychains.c
@@ -127,8 +127,18 @@ static void setup_hooks(void) {
 static int close_fds[16];
 static int close_fds_cnt = 0;
 
+static unsigned get_rand_seed(void) {
+#ifdef HAVE_CLOCK_GETTIME
+	struct timespec now;
+	clock_gettime(CLOCK_REALTIME, &now);
+	return now.tv_sec ^ now.tv_nsec;
+#else
+	return time(NULL);
+#endif
+}
+
 static void do_init(void) {
-	srand(time(NULL));
+	srand(get_rand_seed());
 	core_initialize();
 
 	/* read the config file */