/* *	DDNS v3 Client * *		By:	Alan Yates <alany@ay.com.au> *		Date:	27-08-2000 */#ifdef WIN32#include <windows.h>#else#include <netdb.h>#include <unistd.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <errno.h>#include <string.h>#endif#include <stdio.h>#include "sockio.h"intddns3_sockio_resolve(char *str, struct sockaddr_in *sai) {	struct hostent *he;	char buf[500];	char err[100];	short port;	int ret, i;	for(i = 0; str[i]; i++) if(str[i] == ':') str[i] = ' ';	ret = sscanf(str, "%s%hd", buf, &port);	if(ret < 2) return -1;	if((inet_aton(buf, &sai->sin_addr)) == 0) {		if(!(he = gethostbyname(buf))) {			//perror("gethostbyname()");			ddns3_sockio_error(err,100);			fprintf(stderr,"gethostbyname(): %s\n", err);			return -1;		}		memcpy(&sai->sin_addr.s_addr, he->h_addr, he->h_length);	}	sai->sin_port = htons(port);	sai->sin_family = AF_INET;	return 0;}intddns3_sockio_connect(char *host) {	int ret;	int sock;	struct sockaddr_in sai;	char err[100];	sock = socket(PF_INET, SOCK_STREAM, 0);	if(sock < 0) {		//perror("socket(PF_INET, SOCK_STREAM, 0)");		ddns3_sockio_error(err,100);		fprintf(stderr, "socket(): %s\n",err);		return -1;	}	ret = ddns3_sockio_resolve(host, &sai);	if(ret < 0) {		return -1;	}	ret = connect(sock, (struct sockaddr *)&sai, sizeof(struct sockaddr_in));	if(ret < 0) {		//perror("connect()");		ddns3_sockio_error(err,100);		fprintf(stderr, "connect(): %s\n",err);		return -1;	}		return sock;}intddns3_sockio_write(int sock, char *buf, int len) {	int ret;	char err[100];	/* FIXME: we pretend short writes never happen! */	ret = send(sock, buf, len, 0);	if(ret < 0) {		//perror("write()");		ddns3_sockio_error(err,100);		fprintf(stderr, "send(): %s\n", err);	}		return ret;}intddns3_sockio_read(int sock, char *buf, int len) {	int ret;	char err[100];	ret = recv(sock, buf, len, 0);	if(ret < 0){		//perror("read()");		ddns3_sockio_error(err,100);		fprintf(stderr, "recv(): %s\n", err);	}	return ret;}intddns3_sockio_close(int sock) {#ifdef WIN32	closesocket(sock);#else	close(sock);#endif	return 0;}intddns3_sockio_init(void) {#ifdef WIN32	WORD wVersionRequested;	WSADATA wsaData;	int err; 	wVersionRequested = MAKEWORD( 1, 1 ); 	err = WSAStartup( wVersionRequested, &wsaData );	if ( err != 0 ) {	    /* Tell the user that we could not find a usable */	    /* WinSock DLL.                                  */	    return -1;	}#endif	return 0;}intddns3_sockio_cleanup(void) {#ifdef WIN32	WSACleanup();#endif	return 0;}intddns3_sockio_error(char *buf, int len) {	int code;#ifdef WIN32	code = WSAGetLastError();	sprintf(buf,"%d",code);#else	code = errno;	sprintf(buf,"%s",strerror(code));#endif	return code;}intddns3_sockio_getlocalip(int sock, char *buf, int len) {	int ret;	char err[100];	struct sockaddr_in sai;	int sailen = sizeof(struct sockaddr_in);	ret = getsockname(sock, (struct sockaddr *)&sai, &sailen);	if(ret < 0) {		ddns3_sockio_error(err,100);		fprintf(stderr, "getsockname(): %s\n", err);	}	if(!buf || len < 16) return -1;	return sprintf(buf, "%s", inet_ntoa(sai.sin_addr));}