repack rep

Practice/sem25.10/c_inet.c

@@ -0,0 +1,64 @@
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+//./client_app stud*** "port"
+
+#define DATA "Hello, World!"
+
+int main(int argc, char *argv[])
+{
+  int sock;
+  struct sockaddr_in server;
+  struct hostent *hp;
+  char buf[1024];
+
+  if (argc < 3)
+  {
+    printf("c_inet hostname port [data]\n");
+    _exit(1);
+  }
+
+  if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
+  {
+    perror("opening stream socket");
+    exit(1);
+  }
+
+  hp = malloc(sizeof(struct hostent));
+
+  server.sin_family = AF_INET;
+  hp = gethostbyname(argv[1]);
+  if (hp == (struct hostent *)0)
+  {
+    fprintf(stderr, "%s: unknown host\n", argv[1]);
+    exit(2);
+  }
+  memcpy((char *)&server.sin_addr, (char *)hp->h_addr, hp->h_length);
+  server.sin_port = htons(atoi(argv[2]));
+  if (connect(sock, (struct sockaddr *)&server, sizeof server) == -1)
+  {
+    perror("connecting stream socket");
+    exit(1);
+  }
+  getchar();
+  memset(buf, 0, 1024);
+  if (argc > 3)
+  {
+    printf("[%s]\n", argv[3]);
+    strcpy(buf, argv[3]);
+  }
+  else
+  {
+    strcpy(buf, DATA);
+  }
+  if (write(sock, buf, strlen(buf)) == -1)
+    perror("writing on stream socket");
+  close(sock);
+  exit(0);
+}