#include "../basic.h" #include int main(int argc, char **argv) { int listenfd, connfd, n; struct sockaddr_in servaddr; if (argc != 2 ){ printf("usage: daytimesrv \n"); exit(0); } if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){ printf("socket error\n"); exit(0); } bzero(&servaddr, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY); /* wildcard address */ servaddr.sin_port = htons(atoi(argv[1])); /* server port */ if( (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr))) < 0){ printf("bind error\n"); exit(0); } if( listen(listenfd, 5) < 0 ) { printf("listen error\n"); exit(0); } char client_address_redeable[INET_ADDRSTRLEN]; short client_port_redeable; struct sockaddr_in client_address_struct; unsigned int client_address_struct_size = sizeof(client_address_struct); struct sockaddr_in server_struct_to_send; unsigned int server_struct_to_send_size = sizeof(server_struct_to_send); for ( ; ; ) { if( (connfd = accept(listenfd, (struct sockaddr *) &client_address_struct, &client_address_struct_size)) < 0) { printf("accept error\n"); exit(0); } inet_ntop(AF_INET, &(client_address_struct.sin_addr), client_address_redeable, INET_ADDRSTRLEN);// get client ip client_port_redeable = ntohs(client_address_struct.sin_port);// get client port fprintf (stdout,"%s%c%hu\n",client_address_redeable,':',client_port_redeable); getsockname (connfd, (struct sockaddr *) &server_struct_to_send, &server_struct_to_send_size); write (connfd,&server_struct_to_send, server_struct_to_send_size); close(connfd); } }