diff options
Diffstat (limited to 'src/VBox/Runtime/r3/posix/symlink-posix.cpp')
| -rw-r--r-- | src/VBox/Runtime/r3/posix/symlink-posix.cpp | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/posix/symlink-posix.cpp b/src/VBox/Runtime/r3/posix/symlink-posix.cpp new file mode 100644 index 00000000..94acd540 --- /dev/null +++ b/src/VBox/Runtime/r3/posix/symlink-posix.cpp @@ -0,0 +1,237 @@ +/* $Id: symlink-posix.cpp $ */ +/** @file + * IPRT - Symbolic Links, POSIX. + */ + +/* + * Copyright (C) 2010-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define LOG_GROUP RTLOGGROUP_SYMLINK + +#include <errno.h> +#include <sys/stat.h> +#include <unistd.h> + +#include <iprt/symlink.h> + +#include <iprt/assert.h> +#include <iprt/err.h> +#include <iprt/log.h> +#include <iprt/mem.h> +#include <iprt/string.h> +#include "internal/path.h" + + + +RTDECL(bool) RTSymlinkExists(const char *pszSymlink) +{ + bool fRc = false; + char const *pszNativeSymlink; + int rc = rtPathToNative(&pszNativeSymlink, pszSymlink, NULL); + if (RT_SUCCESS(rc)) + { + struct stat s; + fRc = !lstat(pszNativeSymlink, &s) + && S_ISLNK(s.st_mode); + + rtPathFreeNative(pszNativeSymlink, pszSymlink); + } + + LogFlow(("RTSymlinkExists(%p={%s}): returns %RTbool\n", pszSymlink, pszSymlink, fRc)); + return fRc; +} + + +RTDECL(bool) RTSymlinkIsDangling(const char *pszSymlink) +{ + bool fRc = false; + char const *pszNativeSymlink; + int rc = rtPathToNative(&pszNativeSymlink, pszSymlink, NULL); + if (RT_SUCCESS(rc)) + { + struct stat s; + fRc = !lstat(pszNativeSymlink, &s) + && S_ISLNK(s.st_mode); + if (fRc) + { + errno = 0; + fRc = stat(pszNativeSymlink, &s) != 0 + && ( errno == ENOENT + || errno == ENOTDIR + || errno == ELOOP); + } + + rtPathFreeNative(pszNativeSymlink, pszSymlink); + } + + LogFlow(("RTSymlinkIsDangling(%p={%s}): returns %RTbool\n", pszSymlink, pszSymlink, fRc)); + return fRc; +} + + +RTDECL(int) RTSymlinkCreate(const char *pszSymlink, const char *pszTarget, RTSYMLINKTYPE enmType, uint32_t fCreate) +{ + RT_NOREF_PV(fCreate); + + /* + * Validate the input. + */ + AssertReturn(enmType > RTSYMLINKTYPE_INVALID && enmType < RTSYMLINKTYPE_END, VERR_INVALID_PARAMETER); + AssertPtrReturn(pszSymlink, VERR_INVALID_POINTER); + AssertPtrReturn(pszTarget, VERR_INVALID_POINTER); + + /* + * Convert the paths. + */ + char const *pszNativeSymlink; + int rc = rtPathToNative(&pszNativeSymlink, pszSymlink, NULL); + if (RT_SUCCESS(rc)) + { + const char *pszNativeTarget; + rc = rtPathToNative(&pszNativeTarget, pszTarget, NULL); + if (RT_SUCCESS(rc)) + { + /* + * Create the link. + */ + if (symlink(pszNativeTarget, pszNativeSymlink) == 0) + rc = VINF_SUCCESS; + else + rc = RTErrConvertFromErrno(errno); + + rtPathFreeNative(pszNativeTarget, pszTarget); + } + rtPathFreeNative(pszNativeSymlink, pszSymlink); + } + + LogFlow(("RTSymlinkCreate(%p={%s}, %p={%s}, %d, %#x): returns %Rrc\n", pszSymlink, pszSymlink, pszTarget, pszTarget, enmType, fCreate, rc)); + return rc; +} + + +RTDECL(int) RTSymlinkDelete(const char *pszSymlink, uint32_t fDelete) +{ + RT_NOREF_PV(fDelete); + + char const *pszNativeSymlink; + int rc = rtPathToNative(&pszNativeSymlink, pszSymlink, NULL); + if (RT_SUCCESS(rc)) + { + struct stat s; + if (!lstat(pszNativeSymlink, &s)) + { + if (S_ISLNK(s.st_mode)) + { + if (unlink(pszNativeSymlink) == 0) + rc = VINF_SUCCESS; + else + rc = RTErrConvertFromErrno(errno); + } + else + rc = VERR_NOT_SYMLINK; + } + else + rc = RTErrConvertFromErrno(errno); + rtPathFreeNative(pszNativeSymlink, pszSymlink); + } + + LogFlow(("RTSymlinkDelete(%p={%s}, #%x): returns %Rrc\n", pszSymlink, pszSymlink, fDelete, rc)); + return rc; +} + + +RTDECL(int) RTSymlinkRead(const char *pszSymlink, char *pszTarget, size_t cbTarget, uint32_t fRead) +{ + RT_NOREF_PV(fRead); + + char *pszMyTarget; + int rc = RTSymlinkReadA(pszSymlink, &pszMyTarget); + if (RT_SUCCESS(rc)) + { + rc = RTStrCopy(pszTarget, cbTarget, pszMyTarget); + RTStrFree(pszMyTarget); + } + LogFlow(("RTSymlinkRead(%p={%s}): returns %Rrc\n", pszSymlink, pszSymlink, rc)); + return rc; +} + + +RTDECL(int) RTSymlinkReadA(const char *pszSymlink, char **ppszTarget) +{ + AssertPtr(ppszTarget); + char const *pszNativeSymlink; + int rc = rtPathToNative(&pszNativeSymlink, pszSymlink, NULL); + if (RT_SUCCESS(rc)) + { + /* Guess the initial buffer size. */ + ssize_t cbBuf; + struct stat s; + if (!lstat(pszNativeSymlink, &s)) + cbBuf = RT_MAX(RT_ALIGN_Z(s.st_size, 64), 64); + else + cbBuf = 1024; + + /* Read loop that grows the buffer. */ + char *pszBuf = NULL; + for (;;) + { + RTMemTmpFree(pszBuf); + pszBuf = (char *)RTMemTmpAlloc(cbBuf); + if (pszBuf) + { + ssize_t cbReturned = readlink(pszNativeSymlink, pszBuf, cbBuf); + if (cbReturned >= cbBuf) + { + /* Increase the buffer size and try again */ + cbBuf *= 2; + continue; + } + + if (cbReturned > 0) + { + pszBuf[cbReturned] = '\0'; + rc = rtPathFromNativeDup(ppszTarget, pszBuf, pszSymlink); + } + else if (errno == EINVAL) + rc = VERR_NOT_SYMLINK; + else + rc = RTErrConvertFromErrno(errno); + } + else + rc = VERR_NO_TMP_MEMORY; + break; + } /* for loop */ + + RTMemTmpFree(pszBuf); + rtPathFreeNative(pszNativeSymlink, pszSymlink); + } + + if (RT_SUCCESS(rc)) + LogFlow(("RTSymlinkReadA(%p={%s},%p): returns %Rrc *ppszTarget=%p:{%s}\n", pszSymlink, pszSymlink, ppszTarget, rc, *ppszTarget, *ppszTarget)); + else + LogFlow(("RTSymlinkReadA(%p={%s},%p): returns %Rrc\n", pszSymlink, pszSymlink, ppszTarget, rc)); + return rc; +} + |