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-rw-r--r--toys/pending/sntp.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/toys/pending/sntp.c b/toys/pending/sntp.c
new file mode 100644
index 00000000..f34c3da2
--- /dev/null
+++ b/toys/pending/sntp.c
@@ -0,0 +1,65 @@
+/* sntp.c - sntp client and server
+ *
+ * Copyright 2019 Rob Landley <rob@landley.net>
+ *
+ * See https://www.ietf.org/rfc/rfc4330.txt
+
+USE_SNTP(NEWTOY(sntp, "<1", TOYFLAG_USR|TOYFLAG_BIN))
+
+config SNTP
+ bool "sntp"
+ default n
+ help
+ usage: sntp SERVER...
+
+ Simple Network Time Protocol client, set system clock from a server.
+*/
+
+#define FOR_sntp
+#include "toys.h"
+
+GLOBALS(
+ int unused;
+)
+
+union socksaddr {
+ struct sockaddr_in in;
+ struct sockaddr_in6 in6;
+};
+
+// timeout in milliseconds
+int xrecvwait(int fd, char *buf, int len, union socksaddr *sa, int timeout)
+{
+ socklen_t sl = sizeof(*sa);
+
+ if (timeout >= 0) {
+ struct pollfd pfd;
+
+ pfd.fd = fd;
+ pfd.events = POLLIN;
+ if (!xpoll(&pfd, 1, timeout)) return 0;
+ }
+
+ len = recvfrom(fd, buf, len, 0, (void *)sa, &sl);
+ if (len<0) perror_exit("recvfrom");
+
+ return len;
+}
+
+void sntp_main(void)
+{
+ struct addrinfo *ai;
+ union socksaddr sa;
+ int fd, len;
+
+ ai = xgetaddrinfo(*toys.optargs, 0, AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, 0);
+ // When root, bind to local server address
+ if (!getuid())
+ fd = xbind(xgetaddrinfo("", "123", AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, 0));
+ else fd = xsocket(ai->ai_family, SOCK_DGRAM, IPPROTO_UDP);
+
+ xsendto(fd, toybuf, 48, ai->ai_addr);
+ len = xrecvwait(fd, toybuf, sizeof(toybuf), &sa, 5000);
+ printf("%d\n", len);
+ if (len>0) write(1, toybuf, len);
+}