termux-packages/packages/libresolv-wrapper/src-resolv_wrapper.c.patch

--- a/src/resolv_wrapper.c
+++ b/src/resolv_wrapper.c
@@ -51,6 +51,17 @@
 #include <ctype.h>
 
 #include <resolv.h>
+#include "resolv_private.h"
+
+#if __ANDROID_API__ >= 29
+#define HAVE_RES_RANDOMID 1
+#else
+#undef HAVE_RES_RANDOMID
+#undef res_randomid
+static u_int res_randomid(void);
+#include <fcntl.h>
+#include <sys/time.h>
+#endif
 
 #if defined(HAVE_RES_STATE_U_EXT_NSADDRS) || defined(HAVE_RES_SOCKADDR_UNION_SIN6)
 #define HAVE_RESOLV_IPV6_NSADDRS 1
@@ -74,7 +85,7 @@
 #endif  /* RWRAP_DEFAULT_FAKE_TTL */
 
 #ifndef HAVE_NS_NAME_COMPRESS
-#define ns_name_compress dn_comp
+#define ns_name_compress __dn_comp
 #endif
 
 #define ns_t_uri 256
@@ -1944,6 +1955,8 @@
  *   RES_NINIT
  ***************************************************************************/
 
+static const char *const resolv_conf_default = "@TERMUX_PREFIX@/etc/resolv.conf";
+
 static int rwrap_res_ninit(struct __res_state *state)
 {
 	int rc;
@@ -1952,6 +1965,10 @@
 	if (rc == 0) {
 		const char *resolv_conf = getenv("RESOLV_WRAPPER_CONF");
 
+		if (resolv_conf == NULL) {
+			resolv_conf = resolv_conf_default;
+		}
+
 		if (resolv_conf != NULL) {
 			rc = rwrap_parse_resolv_conf(state, resolv_conf);
 		}
@@ -1984,7 +2001,7 @@
 	return rc;
 }
 
-#if !defined(res_ninit) && defined(HAVE_RES_INIT)
+#if !defined(res_ninit) && defined(HAVE_RES_INIT) || defined(__ANDROID__)
 int res_init(void)
 #elif defined(HAVE___RES_INIT)
 int __res_init(void)
@@ -2222,3 +2239,46 @@
 {
 	return rwrap_res_search(dname, class, type, answer, anslen);
 }
+
+#ifndef HAVE_RES_RANDOMID
+#ifdef ANDROID_CHANGES
+static int
+real_randomid(u_int *random_value) {
+	/* open the nonblocking random device, returning -1 on failure */
+	int random_device = open("/dev/urandom", O_RDONLY | O_CLOEXEC);
+	if (random_device < 0) {
+		return -1;
+	}
+
+	/* read from the random device, returning -1 on failure (or too many retries)*/
+	for (u_int retry = 5; retry > 0; retry--) {
+		int retval = read(random_device, random_value, sizeof(u_int));
+		if (retval == sizeof(u_int)) {
+			*random_value &= 0xffff;
+			close(random_device);
+			return 0;
+		} else if ((retval < 0) && (errno != EINTR)) {
+			break;
+		}
+	}
+
+	close(random_device);
+	return -1;
+}
+#endif /* ANDROID_CHANGES */
+
+static u_int
+res_randomid(void) {
+#ifdef ANDROID_CHANGES
+	int status = 0;
+	u_int output = 0;
+	status = real_randomid(&output);
+	if (status != -1) {
+		return output;
+	}
+#endif /* ANDROID_CHANGES */
+	struct timeval now;
+	gettimeofday(&now, NULL);
+	return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
+}
+#endif