nanoftp.c.svn-base

这是一个用于解析xml文件的类库。使用这个类库

    }

    /*
     * Do the connect.
     */
    if (connect(ctxt->controlFd, (struct sockaddr *) &ctxt->ftpAddr,
	    addrlen) < 0) {
	__xmlIOErr(XML_FROM_FTP, 0, "Failed to create a connection");
        closesocket(ctxt->controlFd); ctxt->controlFd = -1;
        ctxt->controlFd = -1;
	return(-1);
    }

    /*
     * Wait for the HELLO from the server.
     */
    res = xmlNanoFTPGetResponse(ctxt);
    if (res != 2) {
        closesocket(ctxt->controlFd); ctxt->controlFd = -1;
        ctxt->controlFd = -1;
	return(-1);
    }

    /*
     * State diagram for the login operation on the FTP server
     *
     * Reference: RFC 959
     *
     *                       1
     * +---+   USER    +---+------------->+---+
     * | B |---------->| W | 2       ---->| E |
     * +---+           +---+------  |  -->+---+
     *                  | |       | | |
     *                3 | | 4,5   | | |
     *    --------------   -----  | | |
     *   |                      | | | |
     *   |                      | | | |
     *   |                 ---------  |
     *   |               1|     | |   |
     *   V                |     | |   |
     * +---+   PASS    +---+ 2  |  ------>+---+
     * |   |---------->| W |------------->| S |
     * +---+           +---+   ---------->+---+
     *                  | |   | |     |
     *                3 | |4,5| |     |
     *    --------------   --------   |
     *   |                    | |  |  |
     *   |                    | |  |  |
     *   |                 -----------
     *   |             1,3|   | |  |
     *   V                |  2| |  |
     * +---+   ACCT    +---+--  |   ----->+---+
     * |   |---------->| W | 4,5 -------->| F |
     * +---+           +---+------------->+---+
     *
     * Of course in case of using a proxy this get really nasty and is not
     * standardized at all :-(
     */
    if (proxy) {
        int len;
	char buf[400];

        if (proxyUser != NULL) {
	    /*
	     * We need proxy auth
	     */
	    snprintf(buf, sizeof(buf), "USER %s\r\n", proxyUser);
            buf[sizeof(buf) - 1] = 0;
            len = strlen(buf);
#ifdef DEBUG_FTP
	    xmlGenericError(xmlGenericErrorContext, "%s", buf);
#endif
	    res = send(ctxt->controlFd, buf, len, 0);
	    if (res < 0) {
		__xmlIOErr(XML_FROM_FTP, 0, "send failed");
		closesocket(ctxt->controlFd);
		ctxt->controlFd = -1;
	        return(res);
	    }
	    res = xmlNanoFTPGetResponse(ctxt);
	    switch (res) {
		case 2:
		    if (proxyPasswd == NULL)
			break;
		case 3:
		    if (proxyPasswd != NULL)
			snprintf(buf, sizeof(buf), "PASS %s\r\n", proxyPasswd);
		    else
			snprintf(buf, sizeof(buf), "PASS anonymous@\r\n");
                    buf[sizeof(buf) - 1] = 0;
                    len = strlen(buf);
#ifdef DEBUG_FTP
		    xmlGenericError(xmlGenericErrorContext, "%s", buf);
#endif
		    res = send(ctxt->controlFd, buf, len, 0);
		    if (res < 0) {
			__xmlIOErr(XML_FROM_FTP, 0, "send failed");
			closesocket(ctxt->controlFd);
			ctxt->controlFd = -1;
			return(res);
		    }
		    res = xmlNanoFTPGetResponse(ctxt);
		    if (res > 3) {
			closesocket(ctxt->controlFd);
			ctxt->controlFd = -1;
			return(-1);
		    }
		    break;
		case 1:
		    break;
		case 4:
		case 5:
		case -1:
		default:
		    closesocket(ctxt->controlFd);
		    ctxt->controlFd = -1;
		    return(-1);
	    }
	}

	/*
	 * We assume we don't need more authentication to the proxy
	 * and that it succeeded :-\
	 */
	switch (proxyType) {
	    case 0:
		/* we will try in sequence */
	    case 1:
		/* Using SITE command */
		snprintf(buf, sizeof(buf), "SITE %s\r\n", ctxt->hostname);
                buf[sizeof(buf) - 1] = 0;
                len = strlen(buf);
#ifdef DEBUG_FTP
		xmlGenericError(xmlGenericErrorContext, "%s", buf);
#endif
		res = send(ctxt->controlFd, buf, len, 0);
		if (res < 0) {
		    __xmlIOErr(XML_FROM_FTP, 0, "send failed");
		    closesocket(ctxt->controlFd); ctxt->controlFd = -1;
		    ctxt->controlFd = -1;
		    return(res);
		}
		res = xmlNanoFTPGetResponse(ctxt);
		if (res == 2) {
		    /* we assume it worked :-\ 1 is error for SITE command */
		    proxyType = 1;
		    break;
		}    
		if (proxyType == 1) {
		    closesocket(ctxt->controlFd); ctxt->controlFd = -1;
		    ctxt->controlFd = -1;
		    return(-1);
		}
	    case 2:
		/* USER user@host command */
		if (ctxt->user == NULL)
		    snprintf(buf, sizeof(buf), "USER anonymous@%s\r\n",
			           ctxt->hostname);
		else
		    snprintf(buf, sizeof(buf), "USER %s@%s\r\n",
			           ctxt->user, ctxt->hostname);
                buf[sizeof(buf) - 1] = 0;
                len = strlen(buf);
#ifdef DEBUG_FTP
		xmlGenericError(xmlGenericErrorContext, "%s", buf);
#endif
		res = send(ctxt->controlFd, buf, len, 0);
		if (res < 0) {
		    __xmlIOErr(XML_FROM_FTP, 0, "send failed");
		    closesocket(ctxt->controlFd); ctxt->controlFd = -1;
		    ctxt->controlFd = -1;
		    return(res);
		}
		res = xmlNanoFTPGetResponse(ctxt);
		if ((res == 1) || (res == 2)) {
		    /* we assume it worked :-\ */
		    proxyType = 2;
		    return(0);
		}    
		if (ctxt->passwd == NULL)
		    snprintf(buf, sizeof(buf), "PASS anonymous@\r\n");
		else
		    snprintf(buf, sizeof(buf), "PASS %s\r\n", ctxt->passwd);
                buf[sizeof(buf) - 1] = 0;
                len = strlen(buf);
#ifdef DEBUG_FTP
		xmlGenericError(xmlGenericErrorContext, "%s", buf);
#endif
		res = send(ctxt->controlFd, buf, len, 0);
		if (res < 0) {
		    __xmlIOErr(XML_FROM_FTP, 0, "send failed");
		    closesocket(ctxt->controlFd); ctxt->controlFd = -1;
		    ctxt->controlFd = -1;
		    return(res);
		}
		res = xmlNanoFTPGetResponse(ctxt);
		if ((res == 1) || (res == 2)) {
		    /* we assume it worked :-\ */
		    proxyType = 2;
		    return(0);
		}
		if (proxyType == 2) {
		    closesocket(ctxt->controlFd); ctxt->controlFd = -1;
		    ctxt->controlFd = -1;
		    return(-1);
		}
	    case 3:
		/*
		 * If you need support for other Proxy authentication scheme
		 * send the code or at least the sequence in use.
		 */
	    default:
		closesocket(ctxt->controlFd); ctxt->controlFd = -1;
		ctxt->controlFd = -1;
		return(-1);
	}
    }
    /*
     * Non-proxy handling.
     */
    res = xmlNanoFTPSendUser(ctxt);
    if (res < 0) {
        closesocket(ctxt->controlFd); ctxt->controlFd = -1;
        ctxt->controlFd = -1;
	return(-1);
    }
    res = xmlNanoFTPGetResponse(ctxt);
    switch (res) {
	case 2:
	    return(0);
	case 3:
	    break;
	case 1:
	case 4:
	case 5:
        case -1:
	default:
	    closesocket(ctxt->controlFd); ctxt->controlFd = -1;
	    ctxt->controlFd = -1;
	    return(-1);
    }
    res = xmlNanoFTPSendPasswd(ctxt);
    if (res < 0) {
        closesocket(ctxt->controlFd); ctxt->controlFd = -1;
        ctxt->controlFd = -1;
	return(-1);
    }
    res = xmlNanoFTPGetResponse(ctxt);
    switch (res) {
	case 2:
	    break;
	case 3:
	    __xmlIOErr(XML_FROM_FTP, XML_FTP_ACCNT,
		       "FTP server asking for ACCNT on anonymous\n");
	case 1:
	case 4:
	case 5:
        case -1:
	default:
	    closesocket(ctxt->controlFd); ctxt->controlFd = -1;
	    ctxt->controlFd = -1;
	    return(-1);
    }

    return(0);
}

/**
 * xmlNanoFTPConnectTo:
 * @server:  an FTP server name
 * @port:  the port (use 21 if 0)
 *
 * Tries to open a control connection to the given server/port
 *
 * Returns an fTP context or NULL if it failed
 */

void*
xmlNanoFTPConnectTo(const char *server, int port) {
    xmlNanoFTPCtxtPtr ctxt;
    int res;

    xmlNanoFTPInit();
    if (server == NULL) 
	return(NULL);
    ctxt = (xmlNanoFTPCtxtPtr) xmlNanoFTPNewCtxt(NULL);
    ctxt->hostname = xmlMemStrdup(server);
    if (port != 0)
	ctxt->port = port;
    res = xmlNanoFTPConnect(ctxt);
    if (res < 0) {
	xmlNanoFTPFreeCtxt(ctxt);
	return(NULL);
    }
    return(ctxt);
}

/**
 * xmlNanoFTPCwd:
 * @ctx:  an FTP context
 * @directory:  a directory on the server
 *
 * Tries to change the remote directory
 *
 * Returns -1 incase of error, 1 if CWD worked, 0 if it failed
 */

int
xmlNanoFTPCwd(void *ctx, char *directory) {
    xmlNanoFTPCtxtPtr ctxt = (xmlNanoFTPCtxtPtr) ctx;
    char buf[400];
    int len;
    int res;

    /*
     * Expected response code for CWD:
     *
     * CWD
     *     250
     *     500, 501, 502, 421, 530, 550
     */
    snprintf(buf, sizeof(buf), "CWD %s\r\n", directory);
    buf[sizeof(buf) - 1] = 0;
    len = strlen(buf);
#ifdef DEBUG_FTP
    xmlGenericError(xmlGenericErrorContext, "%s", buf);
#endif
    res = send(ctxt->controlFd, buf, len, 0);
    if (res < 0) {
	__xmlIOErr(XML_FROM_FTP, 0, "send failed");
	return(res);
    }
    res = xmlNanoFTPGetResponse(ctxt);
    if (res == 4) {
	return(-1);
    }
    if (res == 2) return(1);
    if (res == 5) {
	return(0);
    }
    return(0);
}

/**
 * xmlNanoFTPDele:
 * @ctx:  an FTP context
 * @file:  a file or directory on the server
 *
 * Tries to delete an item (file or directory) from server
 *
 * Returns -1 incase of error, 1 if DELE worked, 0 if it failed
 */

int
xmlNanoFTPDele(void *ctx, char *file) {
    xmlNanoFTPCtxtPtr ctxt = (xmlNanoFTPCtxtPtr) ctx;
    char buf[400];
    int len;
    int res;

    /*
     * Expected response code for DELE:
     *
     * DELE
     *       250
     *       450, 550
     *       500, 501, 502, 421, 530
     */
	 
    snprintf(buf, sizeof(buf), "DELE %s\r\n", file);
    buf[sizeof(buf) - 1] = 0;
    len = strlen(buf);
#ifdef DEBUG_FTP
    xmlGenericError(xmlGenericErrorContext, "%s", buf);
#endif
    res = send(ctxt->controlFd, buf, len, 0);
    if (res < 0) {
	__xmlIOErr(XML_FROM_FTP, 0, "send failed");
	return(res);
    }
    res = xmlNanoFTPGetResponse(ctxt);
    if (res == 4) {
	return(-1);
    }
    if (res == 2) return(1);
    if (res == 5) {
	return(0);
    }
    return(0);
}
/**
 * xmlNanoFTPGetConnection:
 * @ctx:  an FTP context
 *
 * Try to open a data connection to the server. Currently only
 * passive mode is supported.
 *
 * Returns -1 incase of error, 0 otherwise
 */

int
xmlNanoFTPGetConnection(void *ctx) {
    xmlNanoFTPCtxtPtr ctxt = (xmlNanoFTPCtxtPtr) ctx;
    char buf[200], *cur;
    int len, i;
    int res;
    unsigned char ad[6], *adp, *portp;
    unsigned int temp[6];
#ifdef SUPPORT_IP6
    struct sockaddr_storage dataAddr;
#else
    struct sockaddr_in dataAddr;
#endif
    SOCKLEN_T dataAddrLen;

    memset (&dataAddr, 0, sizeof(dataAddr));
#ifdef SUPPORT_IP6
    if ((ctxt->ftpAddr).ss_family == AF_INET6) {
	ctxt->dataFd = socket (AF_INET6, SOCK_STREAM, IPPROTO_TCP);
	((struct sockaddr_in6 *)&dataAddr)->sin6_family = AF_INET6;
	dataAddrLen = sizeof(struct sockaddr_in6);
    } else
#endif
    {
	ctxt->dataFd = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
	((struct sockaddr_in *)&dataAddr)->sin_family = AF_INET;
	dataAddrLen = sizeof (struct sockaddr_in);
    }

    if (ctxt->dataFd < 0) {
	__xmlIOErr(XML_FROM_FTP, 0, "socket failed");
	return (-1);
    }

    if (ctxt->passive) {
#ifdef SUPPORT_IP6
	if ((ctxt->ftpAddr).ss_family == AF_INET6)
	    snprintf (buf, sizeof(buf), "EPSV\r\n");
	else
#endif
	    snprintf (buf, sizeof(buf), "PASV\r\n");
        len = strlen (buf);
#ifdef DEBUG_FTP
	xmlGenericError(xmlGenericErrorContext, "%s", buf);
#endif
	res = send(ctxt->controlFd, buf, len, 0);
	if (res < 0) {
	    __xmlIOErr(XML_FROM_FTP, 0, "send failed");
	    closesocket(ctxt->dataFd); ctxt->dataFd = -1;
	    return(res);
	}
        res = xmlNanoFTPReadResponse(ctx);
	if (res != 2) {
	    if (res == 5) {
	        closesocket(ctxt->dataFd); ctxt->dataFd = -1;
		return(-1);
	    } else {
		/*
		 * retry with an active connection
		 */
	        closesocket(ctxt->dataFd); ctxt->dataFd = -1;
	        ctxt->passive = 0;
	    }
	}
	cur = &ctxt->controlBuf[ctxt->controlBufAnswer]; 
	while (((*cur < '0') || (*cur > '9')) && *cur != '\0') cur++;
#ifdef SUPPORT_IP6
	if ((ctxt->ftpAddr).ss_family == AF_INET6) {
	    if (sscanf (cur, "%u", &temp[0]) != 1) {
		__xmlIOErr(XML_FROM_FTP, XML_FTP_EPSV_ANSWER,
			"Invalid answer to EPSV\n");
		if (ctxt->dataFd != -1) {
		    closesocket (ctxt->dataFd); ctxt->dataFd = -1;
		}
		return (-1);
	    }
	    memcpy (&((struct sockaddr_in6 *)&dataAddr)->sin6_addr, &((struct sockaddr_in6 *)&ctxt->ftpAddr)->sin6_addr, sizeof(struct in6_addr));
	    ((struct sockaddr_in6 *)&dataAddr)->sin6_port = htons (temp[0]);
	}
	else
#endif
	{
	    if (sscanf (cur, "%u,%u,%u,%u,%u,%u", &temp[0], &temp[1], &temp[2],
		&temp[3], &temp[4], &temp[5]) != 6) {
		__xmlIOErr(XML_FROM_FTP, XML_FTP_PASV_ANSWER,
			"Invalid answer to PASV\n");
		if (ctxt->dataFd != -1) {
		    closesocket (ctxt->dataFd); ctxt->dataFd = -1;
		}
		return (-1);
	    }
	    for (i=0; i<6; i++) ad[i] = (unsigned char) (temp[i] & 0xff);
	    memcpy (&((struct sockaddr_in *)&dataAddr)->sin_addr, &ad[0], 4);
	    memcpy (&((struct sockaddr_in *)&dataAddr)->sin_port, &ad[4], 2);
	}

	if (connect(ctxt->dataFd, (struct sockaddr *) &dataAddr, dataAddrLen) < 0) {
	    __xmlIOErr(XML_FROM_FTP, 0, "Failed to create a data connection");
	    closesocket(ctxt->dataFd); ctxt->dataFd = -1;
	    return (-1);
	}
    } else {
        getsockname(ctxt->dataFd, (struct sockaddr *) &dataAddr, &dataAddrLen);
#ifdef SUPPORT_IP6
	if ((ctxt->ftpAddr).ss_family == AF_INET6)
	    ((struct sockaddr_in6 *)&dataAddr)->sin6_port = 0;
	else
#endif
	    ((struct sockaddr_in *)&dataAddr)->sin_port = 0;

	if (bind(ctxt->dataFd, (struct sockaddr *) &dataAddr, dataAddrLen) < 0) {
	    __xmlIOErr(XML_FROM_FTP, 0, "bind failed");
	    closesocket(ctxt->dataFd); ctxt->dataFd = -1;
	    return (-1);
	}
        getsockname(ctxt->dataFd, (struct sockaddr *) &dataAddr, &dataAddrLen);

	if (listen(ctxt->dataFd, 1) < 0) {
	    __xmlIOErr(XML_FROM_FTP, 0, "listen failed");
	    closesocket(ctxt->dataFd); ctxt->dataFd = -1;
	    return (-1);
	}
#ifdef SUPPORT_IP6
	if ((ctxt->ftpAddr).ss_family == AF_INET6) {
	    char buf6[INET6_ADDRSTRLEN];
	    inet_ntop (AF_INET6, &((struct sockaddr_in6 *)&dataAddr)->sin6_addr,
		    buf6, INET6_ADDRSTRLEN);
	    adp = (unsigned char *) buf6;
	    portp = (unsigned char *) &((struct sockaddr_in6 *)&dataAddr)->sin6_port;
	    snprintf (buf, sizeof(buf), "EPRT |2|%s|%s|\r\n", adp, portp);
        } else
#endif
	{
	    adp = (unsigned char *) &((struct sockaddr_in *)&dataAddr)->sin_addr;
	    portp = (unsigned char *) &((struct sockaddr_in *)&dataAddr)->sin_port;
	    snprintf (buf, sizeof(buf), "PORT %d,%d,%d,%d,%d,%d\r\n",
	    adp[0] & 0xff, adp[1] & 0xff, adp[2] & 0xff, adp[3] & 0xff,
	    portp[0] & 0xff, portp[1] & 0xff);
	}

        buf[sizeof(buf) - 1] = 0;
        len = strlen(buf);
#ifdef DEBUG_FTP
	xmlGenericError(xmlGenericErrorContext, "%s", buf);
#endif

	res = send(ctxt->controlFd, buf, len, 0);
	if (res < 0) {
	    __xmlIOErr(XML_FROM_FTP, 0, "send failed");
	    closesocket(ctxt->dataFd); ctxt->dataFd = -1;
	    return(res);
	}
        res = xmlNanoFTPGetResponse(ctxt);
	if (res != 2) {
	    closesocket(ctxt->dataFd); ctxt->dataFd = -1;
	    return(-1);
        }
    }
    return(ctxt->dataFd);
    
}

/**
 * xmlNanoFTPCloseConnection:
 * @ctx:  an FTP context
 *
 * Close the data connection from the server
 *
 * Returns -1 incase of error, 0 otherwise
 */