first commit

2026-04-24 23:23:07 +02:00
commit 9117bafee3
3 changed files with 38 additions and 0 deletions
@@ -0,0 +1,31 @@
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char** argv){
+  if (argc != 2){
+    printf("u must specifie IP addr\n");
+      exit(1);
+  }
+  printf("target = %s\n", argv[1]);
+  int domain = AF_INET;
+  int type = SOCK_STREAM;
+  int fd = socket(domain, type, 0);
+  printf("fd = %d\n", fd);
+
+  struct sockaddr_in dest_addr;
+  memset(&dest_addr, 0, sizeof(dest_addr)); 
+  dest_addr.sin_family = AF_INET;
+  dest_addr.sin_port = htons(80);
+  dest_addr.sin_addr.s_addr = inet_addr(argv[1]);
+
+  socklen_t len = 0;
+  int ret = getsockname(fd,(struct sockaddr*)&dest_addr, &len);
+  printf("ret_getsockname = %d\n", ret);
+
+  ret = connect(fd,(struct sockaddr*)&dest_addr, len);
+  printf("ret_connect = %d\n", ret);
+  return 0;
+}