emulate.c
上传用户:lyxiangda
上传日期:2007-01-12
资源大小:3042k
文件大小:16k
- /*
- * Functions that emulate PR_AcceptRead and PR_TransmitFile for SSL sockets.
- * Each Layered NSPR protocol (like SSL) must unfortunately contain its
- * own implementation of these functions. This code was taken from NSPR.
- *
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the Netscape security libraries.
- *
- * The Initial Developer of the Original Code is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1994-2000 Netscape Communications Corporation. All
- * Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the
- * GPL.
- *
- * $Id: emulate.c,v 1.2 2000/05/18 01:32:53 nelsonb%netscape.com Exp $
- */
- #include "nspr.h"
- #if defined( XP_UNIX )
- #include <fcntl.h>
- #endif
- #if defined(WIN32)
- #include <windef.h>
- #include <winbase.h>
- #endif
- #include <string.h>
- #define AMASK 7 /* mask for alignment of PRNetAddr */
- /*
- * _PR_EmulateAcceptRead
- *
- * Accept an incoming connection on sd, set *nd to point to the
- * newly accepted socket, read 'amount' bytes from the accepted
- * socket.
- *
- * buf is a buffer of length = amount + (2 * sizeof(PRNetAddr)) + 32
- * *raddr points to the PRNetAddr of the accepted connection upon
- * return
- *
- * return number of bytes read or -1 on error
- *
- */
- PRInt32
- ssl_EmulateAcceptRead( PRFileDesc * sd,
- PRFileDesc ** nd,
- PRNetAddr ** raddr,
- void * buf,
- PRInt32 amount,
- PRIntervalTime timeout)
- {
- PRFileDesc * newsockfd;
- PRInt32 rv;
- PRNetAddr remote;
- if (!(newsockfd = PR_Accept(sd, &remote, PR_INTERVAL_NO_TIMEOUT))) {
- return -1;
- }
- rv = PR_Recv(newsockfd, buf, amount, 0, timeout);
- if (rv >= 0) {
- ptrdiff_t pNetAddr = (((ptrdiff_t)buf) + amount + AMASK) & ~AMASK;
- *nd = newsockfd;
- *raddr = (PRNetAddr *)pNetAddr;
- memcpy((void *)pNetAddr, &remote, sizeof(PRNetAddr));
- return rv;
- }
- PR_Close(newsockfd);
- return -1;
- }
- #if !defined( XP_UNIX ) && !defined( WIN32 )
- /*
- * _PR_EmulateTransmitFile
- *
- * Send file fd across socket sd. If headers is non-NULL, 'hlen'
- * bytes of headers is sent before sending the file.
- *
- * PR_TRANSMITFILE_CLOSE_SOCKET flag - close socket after sending file
- *
- * return number of bytes sent or -1 on error
- *
- */
- #define _TRANSMITFILE_BUFSIZE (16 * 1024)
- PRInt32
- ssl_EmulateTransmitFile( PRFileDesc * sd,
- PRFileDesc * fd,
- const void * headers,
- PRInt32 hlen,
- PRTransmitFileFlags flags,
- PRIntervalTime timeout)
- {
- char * buf = NULL;
- PRInt32 count = 0;
- PRInt32 rlen;
- PRInt32 rv;
- buf = PR_MALLOC(_TRANSMITFILE_BUFSIZE);
- if (buf == NULL) {
- PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
- return -1;
- }
- /*
- * send headers, first
- */
- while (hlen) {
- rv = PR_Send(sd, headers, hlen, 0, timeout);
- if (rv < 0) {
- /* PR_Send() has invoked PR_SetError(). */
- rv = -1;
- goto done;
- }
- count += rv;
- headers = (const void*) ((const char*)headers + rv);
- hlen -= rv;
- }
- /*
- * send file, next
- */
- while ((rlen = PR_Read(fd, buf, _TRANSMITFILE_BUFSIZE)) > 0) {
- while (rlen) {
- char *bufptr = buf;
- rv = PR_Send(sd, bufptr, rlen,0,PR_INTERVAL_NO_TIMEOUT);
- if (rv < 0) {
- /* PR_Send() has invoked PR_SetError(). */
- rv = -1;
- goto done;
- }
- count += rv;
- bufptr = ((char*)bufptr + rv);
- rlen -= rv;
- }
- }
- if (rlen == 0) {
- /*
- * end-of-file
- */
- if (flags & PR_TRANSMITFILE_CLOSE_SOCKET)
- PR_Close(sd);
- rv = count;
- } else {
- PR_ASSERT(rlen < 0);
- /* PR_Read() has invoked PR_SetError(). */
- rv = -1;
- }
- done:
- if (buf)
- PR_DELETE(buf);
- return rv;
- }
- #else
- #define TRANSMITFILE_MMAP_CHUNK (256 * 1024)
- /*
- * _PR_UnixTransmitFile
- *
- * Send file fd across socket sd. If headers is non-NULL, 'hlen'
- * bytes of headers is sent before sending the file.
- *
- * PR_TRANSMITFILE_CLOSE_SOCKET flag - close socket after sending file
- *
- * return number of bytes sent or -1 on error
- *
- */
- PRInt32
- ssl_EmulateTransmitFile( PRFileDesc * sd,
- PRFileDesc * fd,
- const void * headers,
- PRInt32 hlen,
- PRTransmitFileFlags flags,
- PRIntervalTime timeout)
- {
- void * addr;
- PRFileMap * mapHandle = NULL;
- PRInt32 count = 0;
- PRInt32 index = 0;
- PRInt32 len = 0;
- PRInt32 rv;
- struct PRFileInfo info;
- struct PRIOVec iov[2];
- /* Get file size */
- if (PR_SUCCESS != PR_GetOpenFileInfo(fd, &info)) {
- count = -1;
- goto done;
- }
- if (hlen) {
- iov[index].iov_base = (char *) headers;
- iov[index].iov_len = hlen;
- index++;
- }
- if (info.size > 0) {
- mapHandle = PR_CreateFileMap(fd, info.size, PR_PROT_READONLY);
- if (mapHandle == NULL) {
- count = -1;
- goto done;
- }
- /*
- * If the file is large, mmap and send the file in chunks so as
- * to not consume too much virtual address space
- */
- len = PR_MIN(info.size , TRANSMITFILE_MMAP_CHUNK );
- /*
- * Map in (part of) file. Take care of zero-length files.
- */
- if (len) {
- addr = PR_MemMap(mapHandle, 0, len);
- if (addr == NULL) {
- count = -1;
- goto done;
- }
- }
- iov[index].iov_base = (char*)addr;
- iov[index].iov_len = len;
- index++;
- }
- if (!index)
- goto done;
- rv = PR_Writev(sd, iov, index, timeout);
- if (len) {
- PR_MemUnmap(addr, len);
- }
- if (rv >= 0) {
- PR_ASSERT(rv == hlen + len);
- info.size -= len;
- count += rv;
- } else {
- count = -1;
- goto done;
- }
- /*
- * send remaining bytes of the file, if any
- */
- len = PR_MIN(info.size , TRANSMITFILE_MMAP_CHUNK );
- while (len > 0) {
- /*
- * Map in (part of) file
- */
- PR_ASSERT((count - hlen) % TRANSMITFILE_MMAP_CHUNK == 0);
- addr = PR_MemMap(mapHandle, count - hlen, len);
- if (addr == NULL) {
- count = -1;
- goto done;
- }
- rv = PR_Send(sd, addr, len, 0, timeout);
- PR_MemUnmap(addr, len);
- if (rv >= 0) {
- PR_ASSERT(rv == len);
- info.size -= rv;
- count += rv;
- len = PR_MIN(info.size , TRANSMITFILE_MMAP_CHUNK );
- } else {
- count = -1;
- goto done;
- }
- }
- done:
- if ((count >= 0) && (flags & PR_TRANSMITFILE_CLOSE_SOCKET))
- PR_Close(sd);
- if (mapHandle != NULL)
- PR_CloseFileMap(mapHandle);
- return count;
- }
- #endif /* XP_UNIX */
- #if !defined( XP_UNIX ) && !defined( WIN32 )
- /*
- * _PR_EmulateSendFile
- *
- * Send file sfd->fd across socket sd. The header and trailer buffers
- * specified in the 'sfd' argument are sent before and after the file,
- * respectively.
- *
- * PR_TRANSMITFILE_CLOSE_SOCKET flag - close socket after sending file
- *
- * return number of bytes sent or -1 on error
- *
- */
- PRInt32
- ssl_EmulateSendFile(PRFileDesc *sd, PRSendFileData *sfd,
- PRTransmitFileFlags flags, PRIntervalTime timeout)
- {
- char * buf = NULL;
- const void * buffer;
- PRInt32 rv;
- PRInt32 count = 0;
- PRInt32 rlen;
- PRInt32 buflen;
- PRInt32 sendbytes;
- PRInt32 readbytes;
- #define _SENDFILE_BUFSIZE (16 * 1024)
- buf = (char*)PR_MALLOC(_SENDFILE_BUFSIZE);
- if (buf == NULL) {
- PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
- return -1;
- }
- /*
- * send header, first
- */
- buflen = sfd->hlen;
- buffer = sfd->header;
- while (buflen) {
- rv = PR_Send(sd, buffer, buflen, 0, timeout);
- if (rv < 0) {
- /* PR_Send() has invoked PR_SetError(). */
- rv = -1;
- goto done;
- } else {
- count += rv;
- buffer = (const void*) ((const char*)buffer + rv);
- buflen -= rv;
- }
- }
- /*
- * send file, next
- */
- if (PR_Seek(sfd->fd, sfd->file_offset, PR_SEEK_SET) < 0) {
- rv = -1;
- goto done;
- }
- sendbytes = sfd->file_nbytes;
- if (sendbytes == 0) {
- /* send entire file */
- while ((rlen = PR_Read(sfd->fd, buf, _SENDFILE_BUFSIZE)) > 0) {
- while (rlen) {
- char *bufptr = buf;
- rv = PR_Send(sd, bufptr, rlen, 0, timeout);
- if (rv < 0) {
- /* PR_Send() has invoked PR_SetError(). */
- rv = -1;
- goto done;
- } else {
- count += rv;
- bufptr = ((char*)bufptr + rv);
- rlen -= rv;
- }
- }
- }
- if (rlen < 0) {
- /* PR_Read() has invoked PR_SetError(). */
- rv = -1;
- goto done;
- }
- } else {
- readbytes = PR_MIN(sendbytes, _SENDFILE_BUFSIZE);
- while (readbytes && ((rlen = PR_Read(sfd->fd, buf, readbytes)) > 0)) {
- while (rlen) {
- char *bufptr = buf;
- rv = PR_Send(sd, bufptr, rlen, 0, timeout);
- if (rv < 0) {
- /* PR_Send() has invoked PR_SetError(). */
- rv = -1;
- goto done;
- } else {
- count += rv;
- sendbytes -= rv;
- bufptr = ((char*)bufptr + rv);
- rlen -= rv;
- }
- }
- readbytes = PR_MIN(sendbytes, _SENDFILE_BUFSIZE);
- }
- if (rlen < 0) {
- /* PR_Read() has invoked PR_SetError(). */
- rv = -1;
- goto done;
- } else if (sendbytes != 0) {
- /*
- * there are fewer bytes in file to send than specified
- */
- PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
- rv = -1;
- goto done;
- }
- }
- /*
- * send trailer, last
- */
- buflen = sfd->tlen;
- buffer = sfd->trailer;
- while (buflen) {
- rv = PR_Send(sd, buffer, buflen, 0, timeout);
- if (rv < 0) {
- /* PR_Send() has invoked PR_SetError(). */
- rv = -1;
- goto done;
- } else {
- count += rv;
- buffer = (const void*) ((const char*)buffer + rv);
- buflen -= rv;
- }
- }
- rv = count;
- done:
- if (buf)
- PR_DELETE(buf);
- if ((rv >= 0) && (flags & PR_TRANSMITFILE_CLOSE_SOCKET))
- PR_Close(sd);
- return rv;
- }
- #else /* UNIX and NT handled below */
- /*
- * _PR_UnixSendFile
- *
- * Send file sfd->fd across socket sd. If header/trailer are specified
- * they are sent before and after the file, respectively.
- *
- * PR_TRANSMITFILE_CLOSE_SOCKET flag - close socket after sending file
- *
- * return number of bytes sent or -1 on error
- *
- */
- #define SENDFILE_MMAP_CHUNK (256 * 1024)
- PRInt32
- ssl_EmulateSendFile(PRFileDesc *sd, PRSendFileData *sfd,
- PRTransmitFileFlags flags, PRIntervalTime timeout)
- {
- void * addr;
- PRFileMap * mapHandle = NULL;
- PRInt32 count = 0;
- PRInt32 file_bytes;
- PRInt32 index = 0;
- PRInt32 len;
- PRInt32 rv;
- PRUint32 addr_offset;
- PRUint32 file_mmap_offset;
- PRUint32 mmap_len;
- PRUint32 pagesize;
- struct PRFileInfo info;
- struct PRIOVec iov[3];
- /* Get file size */
- if (PR_SUCCESS != PR_GetOpenFileInfo(sfd->fd, &info)) {
- count = -1;
- goto done;
- }
- if (sfd->file_nbytes &&
- (info.size < (sfd->file_offset + sfd->file_nbytes))) {
- /*
- * there are fewer bytes in file to send than specified
- */
- PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
- count = -1;
- goto done;
- }
- if (sfd->file_nbytes)
- file_bytes = sfd->file_nbytes;
- else
- file_bytes = info.size - sfd->file_offset;
- #if defined(WIN32)
- {
- SYSTEM_INFO sysinfo;
- GetSystemInfo(&sysinfo);
- pagesize = sysinfo.dwAllocationGranularity;
- }
- #else
- pagesize = PR_GetPageSize();
- #endif
- /*
- * If the file is large, mmap and send the file in chunks so as
- * to not consume too much virtual address space
- */
- if (!sfd->file_offset || !(sfd->file_offset & (pagesize - 1))) {
- /*
- * case 1: page-aligned file offset
- */
- mmap_len = PR_MIN(file_bytes, SENDFILE_MMAP_CHUNK);
- len = mmap_len;
- file_mmap_offset = sfd->file_offset;
- addr_offset = 0;
- } else {
- /*
- * case 2: non page-aligned file offset
- */
- /* find previous page boundary */
- file_mmap_offset = (sfd->file_offset & ~(pagesize - 1));
- /* number of initial bytes to skip in mmap'd segment */
- addr_offset = sfd->file_offset - file_mmap_offset;
- PR_ASSERT(addr_offset > 0);
- mmap_len = PR_MIN(file_bytes + addr_offset, SENDFILE_MMAP_CHUNK);
- len = mmap_len - addr_offset;
- }
- /*
- * Map in (part of) file. Take care of zero-length files.
- */
- if (len > 0) {
- mapHandle = PR_CreateFileMap(sfd->fd, info.size, PR_PROT_READONLY);
- if (!mapHandle) {
- count = -1;
- goto done;
- }
- addr = PR_MemMap(mapHandle, file_mmap_offset, mmap_len);
- if (!addr) {
- count = -1;
- goto done;
- }
- }
- /*
- * send headers, first, followed by the file
- */
- if (sfd->hlen) {
- iov[index].iov_base = (char *) sfd->header;
- iov[index].iov_len = sfd->hlen;
- index++;
- }
- if (len) {
- iov[index].iov_base = (char*)addr + addr_offset;
- iov[index].iov_len = len;
- index++;
- }
- if ((file_bytes == len) && (sfd->tlen)) {
- /*
- * all file data is mapped in; send the trailer too
- */
- iov[index].iov_base = (char *) sfd->trailer;
- iov[index].iov_len = sfd->tlen;
- index++;
- }
- rv = PR_Writev(sd, iov, index, timeout);
- if (len)
- PR_MemUnmap(addr, mmap_len);
- if (rv < 0) {
- count = -1;
- goto done;
- }
- PR_ASSERT(rv == sfd->hlen + len + ((len == file_bytes) ? sfd->tlen : 0));
- file_bytes -= len;
- count += rv;
- if (!file_bytes) /* header, file and trailer are sent */
- goto done;
- /*
- * send remaining bytes of the file, if any
- */
- len = PR_MIN(file_bytes, SENDFILE_MMAP_CHUNK);
- while (len > 0) {
- /*
- * Map in (part of) file
- */
- file_mmap_offset = sfd->file_offset + count - sfd->hlen;
- PR_ASSERT((file_mmap_offset % pagesize) == 0);
- addr = PR_MemMap(mapHandle, file_mmap_offset, len);
- if (!addr) {
- count = -1;
- goto done;
- }
- rv = PR_Send(sd, addr, len, 0, timeout);
- PR_MemUnmap(addr, len);
- if (rv < 0) {
- count = -1;
- goto done;
- }
- PR_ASSERT(rv == len);
- file_bytes -= rv;
- count += rv;
- len = PR_MIN(file_bytes, SENDFILE_MMAP_CHUNK);
- }
- PR_ASSERT(0 == file_bytes);
- if (sfd->tlen) {
- rv = PR_Send(sd, sfd->trailer, sfd->tlen, 0, timeout);
- if (rv >= 0) {
- PR_ASSERT(rv == sfd->tlen);
- count += rv;
- } else
- count = -1;
- }
- done:
- if (mapHandle)
- PR_CloseFileMap(mapHandle);
- if ((count >= 0) && (flags & PR_TRANSMITFILE_CLOSE_SOCKET))
- PR_Close(sd);
- return count;
- }
- #endif /* UNIX and NT */