Does this server is vuln. to buffer overflow?

[hyaku_]

Hi!
I'm learning about buffer overflows! I writted a simple server, so I can see how remote buffer overflows work, but there is a problem! When recv(); recives data, the third recv(); argument specifies how much data it will recive, just like strncpy(); - how much data will be copied! Does this server is vuln. to buffer overflow's if I don't use strcpy();?

#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>

int main(){


	char buffer[10];
	struct sockaddr_in server;
	int addr_len, sock, sock_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

	server.sin_family = AF_INET;
	server.sin_port   = htons(100);
	server.sin_addr.s_addr = INADDR_ANY;

	bind(sock_fd, (struct sockaddr*)&server, sizeof(server));
	listen(sock_fd, 10);

	while(1){

		addr_len = sizeof(server);
		sock = accept(sock_fd, (struct sockaddr*)&server, &addr_len);

		while(1){

			recv(sock, buffer, sizeof(buffer), 0);

			if(strncmp("quit", buffer, 4) == 0){
				close(sock);
				break;
			}	
		}
	}

return 0;
}

Thank you!