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Absolute filepath resolution for followsymlink

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This commit is contained in:
Alex Jordan 2016-07-07 09:31:08 -07:00
parent 43f07425e9
commit 86299552a1
1 changed files with 91 additions and 38 deletions
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129
src/libpsl-native/src/followsymlink.cpp
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@ -45,46 +45,99 @@ char* FollowSymLink(const char* fileName)
return NULL;
}
char buffer[PATH_MAX];
ssize_t sz = readlink(fileName, buffer, PATH_MAX);
char actualpath[PATH_MAX+1];
char* realPath = realpath(fileName, actualpath);
if (sz == -1)
/* if realPath does not return a value, continue with previous implementation of symlink*/
if (realPath == NULL)
{
switch(errno)
char buffer[PATH_MAX];
ssize_t sz = readlink(fileName, buffer, PATH_MAX);
if (sz == -1)
{
case EACCES:
errno = ERROR_ACCESS_DENIED;
break;
case EFAULT:
errno = ERROR_INVALID_ADDRESS;
break;
case EINVAL:
errno = ERROR_INVALID_NAME;
break;
case EIO:
errno = ERROR_GEN_FAILURE;
break;
case ELOOP:
errno = ERROR_STOPPED_ON_SYMLINK;
break;
case ENAMETOOLONG:
errno = ERROR_BAD_PATH_NAME;
break;
case ENOENT:
errno = ERROR_FILE_NOT_FOUND;
break;
case ENOMEM:
errno = ERROR_OUTOFMEMORY;
break;
case ENOTDIR:
errno = ERROR_BAD_PATH_NAME;
break;
default:
errno = ERROR_INVALID_FUNCTION;
}
return NULL;
}
buffer[sz] = '\0';
return strndup(buffer, sz + 1);
switch(errno)
{
case EACCES:
errno = ERROR_ACCESS_DENIED;
break;
case EFAULT:
errno = ERROR_INVALID_ADDRESS;
break;
case EINVAL:
errno = ERROR_INVALID_NAME;
break;
case EIO:
errno = ERROR_GEN_FAILURE;
break;
case ELOOP:
errno = ERROR_STOPPED_ON_SYMLINK;
break;
case ENAMETOOLONG:
errno = ERROR_BAD_PATH_NAME;
break;
case ENOENT:
errno = ERROR_FILE_NOT_FOUND;
break;
case ENOMEM:
errno = ERROR_OUTOFMEMORY;
break;
case ENOTDIR:
errno = ERROR_BAD_PATH_NAME;
break;
default:
errno = ERROR_INVALID_FUNCTION;
}
return NULL;
}
buffer[sz] = '\0';
return strndup(buffer, sz + 1);
}
/*else realpath returned a valid resolved path*/
else
{
if (sizeof(realPath) == -1)
{
switch(errno)
{
case EACCES:
errno = ERROR_ACCESS_DENIED;
break;
case EFAULT:
errno = ERROR_INVALID_ADDRESS;
break;
case EINVAL:
errno = ERROR_INVALID_NAME;
break;
case EIO:
errno = ERROR_GEN_FAILURE;
break;
case ELOOP:
errno = ERROR_STOPPED_ON_SYMLINK;
break;
case ENAMETOOLONG:
errno = ERROR_BAD_PATH_NAME;
break;
case ENOENT:
errno = ERROR_FILE_NOT_FOUND;
break;
case ENOMEM:
errno = ERROR_OUTOFMEMORY;
break;
case ENOTDIR:
errno = ERROR_BAD_PATH_NAME;
break;
default:
errno = ERROR_INVALID_FUNCTION;
}
return NULL;
}
return strndup(realPath, strlen(realPath) + 1 );
}
}