new

client/c/yadync.c

@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+#include "md5.h"
+
+int main(int argc, char **argv) {
+  if (argc != 5) {
+    printf("wrong number of arguments, requires dynid, shared secret, server ip, server port\n");
+    return 1;
+  }
+
+  const char *dynid = argv[1];
+  const char *sharedSecret = argv[2];
+  const char *serverIp = argv[3];
+  int serverPort = atoi(argv[4]);
+
+  if (strlen(dynid) > 64 || strlen(sharedSecret) > 64) {
+    printf("dynid or shared secret too long, max 64 chars each\n");
+    return 2;
+  }
+  if (strlen(serverIp) < 7 || strlen(serverIp) > 15) {
+    printf("server ip too short or too long\n");
+    return 3;
+  }
+
+
+  int t = (int) time(NULL);
+
+  char buf[256];
+  sprintf(buf, "%s %s %d", dynid, sharedSecret, t);
+
+  md5_state_t state;
+
+  md5_init(&state);
+  md5_append(&state, buf, strlen(buf));
+
+  char c[16];
+  md5_finish(&state, c);
+
+  sprintf(buf, "%s %d %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
+	  dynid, t, 
+	  (c[0] & 0xff), (c[1] & 0xff), (c[2] & 0xff), (c[3] & 0xff), 
+	  (c[4] & 0xff), (c[5] & 0xff), (c[6] & 0xff), (c[7] & 0xff),
+	  (c[8] & 0xff), (c[9] & 0xff), (c[10] & 0xff), (c[11] & 0xff), 
+	  (c[12] & 0xff), (c[13] & 0xff), (c[14] & 0xff), (c[15] & 0xff));
+
+  struct sockaddr_in servaddr;
+  memset(&servaddr, 0, sizeof(servaddr));
+  servaddr.sin_family = AF_INET;
+  servaddr.sin_port = htons(serverPort);
+  inet_pton(AF_INET, serverIp, &servaddr.sin_addr);
+  
+  int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+  sendto(sockfd, buf, strlen(buf), 0, (struct sockaddr*) &servaddr, sizeof(servaddr));
+  close(sockfd);
+
+  return 0;
+}