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n2n/src/wire.c

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/**
* (C) 2007-22 - ntop.org and contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not see see <http://www.gnu.org/licenses/>
*
*/
/** Routines for encoding and decoding n2n packets on the wire.
*
* encode_X(base,idx,v) prototypes are inspired by the erlang internal
* encoding model. Passing the start of a buffer in base and a pointer to an
* integer (initially set to zero). Each encode routine increases idx by the
* amount written and returns the amount written. In this way complex sequences
* of encodings can be represented cleanly. See encode_register() for an
* example.
*/
#include "n2n.h"
int encode_uint8 (uint8_t * base,
size_t * idx,
const uint8_t v) {
*(base + (*idx)) = (v & 0xff);
++(*idx);
return 1;
}
int decode_uint8 (uint8_t * out,
const uint8_t * base,
size_t * rem,
size_t * idx) {
if(*rem < 1) {
return 0;
}
*out = ( base[*idx] & 0xff );
++(*idx);
--(*rem);
return 1;
}
int encode_uint16 (uint8_t * base,
size_t * idx,
const uint16_t v) {
*(base + (*idx)) = ( v >> 8) & 0xff;
*(base + (1 + *idx)) = ( v & 0xff );
*idx += 2;
return 2;
}
int decode_uint16 (uint16_t * out,
const uint8_t * base,
size_t * rem,
size_t * idx) {
if(*rem < 2) {
return 0;
}
*out = ( base[*idx] & 0xff ) << 8;
*out |= ( base[1 + *idx] & 0xff );
*idx += 2;
*rem -= 2;
return 2;
}
int encode_uint32 (uint8_t * base,
size_t * idx,
const uint32_t v) {
*(base + (0 + *idx)) = ( v >> 24) & 0xff;
*(base + (1 + *idx)) = ( v >> 16) & 0xff;
*(base + (2 + *idx)) = ( v >> 8) & 0xff;
*(base + (3 + *idx)) = ( v & 0xff );
*idx += 4;
return 4;
}
int decode_uint32 (uint32_t * out,
const uint8_t * base,
size_t * rem,
size_t * idx) {
if(*rem < 4) {
return 0;
}
*out = ( base[0 + *idx] & 0xff ) << 24;
*out |= ( base[1 + *idx] & 0xff ) << 16;
*out |= ( base[2 + *idx] & 0xff ) << 8;
*out |= ( base[3 + *idx] & 0xff );
*idx += 4;
*rem -= 4;
return 4;
}
int encode_uint64 (uint8_t * base,
size_t * idx,
const uint64_t v) {
*(uint64_t*)(base + *idx) = htobe64(v);
*idx += 8;
return 8;
}
int decode_uint64 (uint64_t * out,
const uint8_t * base,
size_t * rem,
size_t * idx) {
if(*rem < 8) {
return 0;
}
*out = be64toh(*(uint64_t*)base + *idx);
*idx += 8;
*rem -= 8;
return 8;
}
int encode_buf (uint8_t * base,
size_t * idx,
const void * p,
size_t s) {
memcpy((base + (*idx)), p, s);
*idx += s;
return s;
}
/* Copy from base to out of size bufsize */
int decode_buf (uint8_t * out,
size_t bufsize,
const uint8_t * base,
size_t * rem,
size_t * idx) {
if(*rem < bufsize) {
return 0;
}
memcpy(out, (base + *idx), bufsize);
*idx += bufsize;
*rem -= bufsize;
return bufsize;
}
int encode_mac (uint8_t * base, /* n2n_mac_t is typedefed array type which is always passed by reference */
size_t * idx,
const n2n_mac_t m) {
return encode_buf(base, idx, m, N2N_MAC_SIZE);
}
int decode_mac (n2n_mac_t out,
const uint8_t * base,
size_t * rem,
size_t * idx) {
return decode_buf(out, N2N_MAC_SIZE, base, rem, idx);
}
int encode_cookie (uint8_t * base,
size_t * idx,
const n2n_cookie_t c) {
return encode_uint32(base, idx, c);
}
int decode_cookie (n2n_cookie_t * out, /* cookies are typedef'd as uint32_t which needs to correspond to this code */
const uint8_t * base,
size_t * rem,
size_t * idx) {
return decode_uint32(out, base, rem, idx);
}
int encode_common (uint8_t * base,
size_t * idx,
const n2n_common_t * common) {
uint16_t flags = 0;
encode_uint8(base, idx, N2N_PKT_VERSION);
encode_uint8(base, idx, common->ttl);
flags = common->pc & N2N_FLAGS_TYPE_MASK;
flags |= common->flags & N2N_FLAGS_BITS_MASK;
encode_uint16(base, idx, flags);
encode_buf(base, idx, common->community, N2N_COMMUNITY_SIZE);
return -1;
}
int decode_common (n2n_common_t * out,
const uint8_t * base,
size_t * rem,
size_t * idx) {
size_t idx0 = *idx;
uint8_t dummy = 0;
decode_uint8(&dummy, base, rem, idx);
if(N2N_PKT_VERSION != dummy) {
return -1;
}
decode_uint8(&(out->ttl), base, rem, idx);
decode_uint16(&(out->flags), base, rem, idx);
out->pc = (out->flags & N2N_FLAGS_TYPE_MASK);
out->flags &= N2N_FLAGS_BITS_MASK;
decode_buf(out->community, N2N_COMMUNITY_SIZE, base, rem, idx);
return (*idx - idx0);
}
int encode_sock (uint8_t * base,
size_t * idx,
const n2n_sock_t * sock) {
int retval = 0;
uint16_t f;
switch(sock->family) {
case AF_INET: {
f = 0;
if(sock->type == SOCK_STREAM) {
f |= 0x4000;
}
retval += encode_uint16(base, idx, f);
retval += encode_uint16(base, idx, sock->port);
retval += encode_buf(base, idx, sock->addr.v4, IPV4_SIZE);
break;
}
case AF_INET6: {
f = 0x8000;
if(sock->type == SOCK_STREAM) {
f |= 0x4000;
}
retval += encode_uint16(base, idx, f);
retval += encode_uint16(base, idx, sock->port);
retval += encode_buf(base, idx, sock->addr.v6, IPV6_SIZE);
break;
}
default:
retval = -1;
}
return retval;
}
int decode_sock (n2n_sock_t * sock,
const uint8_t * base,
size_t * rem,
size_t * idx) {
size_t * idx0 = idx;
uint16_t f = 0;
decode_uint16(&f, base, rem, idx);
decode_uint16(&(sock->port), base, rem, idx);
if(f & 0x8000) {
// IPv6
sock->family = AF_INET6;
decode_buf(sock->addr.v6, IPV6_SIZE, base, rem, idx);
} else {
// IPv4
sock->family = AF_INET;
memset(sock->addr.v6, 0, IPV6_SIZE); /* so memcmp() works for equality. */
decode_buf(sock->addr.v4, IPV4_SIZE, base, rem, idx);
}
if(f & 0x4000) {
// TCP
sock->type = SOCK_STREAM;
} else {
// UDP
sock->type = SOCK_DGRAM;
}
return (idx - idx0);
}
// bugfix for https://github.com/ntop/n2n/issues/1029
// REVISIT: best to be removed with 4.0
int encode_sock_payload (uint8_t * base,
size_t * idx,
const n2n_sock_t * sock) {
int retval = 0;
retval += encode_uint8(base, idx, sock->family);
retval += encode_uint8(base, idx, 0); // blank
retval += encode_uint8(base, idx, sock->port & 0x00FF);
retval += encode_uint8(base, idx, sock->port >> 8);
// copy full address field length
retval += encode_buf(base, idx, sock->addr.v6, IPV6_SIZE);
return retval;
}
// bugfix for https://github.com/ntop/n2n/issues/1029
// REVISIT: best to be removed with 4.0
int decode_sock_payload (n2n_sock_t * sock,
const uint8_t * base,
size_t * rem,
size_t * idx) {
int retval = 0;
uint8_t port_low = 0;
uint8_t port_high = 0;
retval += decode_uint8(&(sock->family), base, rem, idx);
++(*idx); // skip blank
--(*rem);
++retval;
retval += decode_uint8(&port_low, base, rem, idx);
retval += decode_uint8(&port_high, base, rem, idx);
sock->port = ((uint16_t)port_high << 8) + port_low;
// copy full address field length
retval += decode_buf(sock->addr.v6, IPV6_SIZE, base, rem, idx);
return retval;
}
int encode_REGISTER (uint8_t *base,
size_t *idx,
const n2n_common_t *common,
const n2n_REGISTER_t *reg) {
int retval = 0;
retval += encode_common(base, idx, common);
retval += encode_cookie(base, idx, reg->cookie);
retval += encode_mac(base, idx, reg->srcMac);
retval += encode_mac(base, idx, reg->dstMac);
if(common->flags & N2N_FLAGS_SOCKET) {
retval += encode_sock(base, idx, &(reg->sock));
}
retval += encode_uint32(base, idx, reg->dev_addr.net_addr);
retval += encode_uint8(base, idx, reg->dev_addr.net_bitlen);
retval += encode_buf(base, idx, reg->dev_desc, N2N_DESC_SIZE);
return retval;
}
int decode_REGISTER (n2n_REGISTER_t *reg,
const n2n_common_t *cmn, /* info on how to interpret it */
const uint8_t *base,
size_t *rem,
size_t *idx) {
size_t retval = 0;
memset(reg, 0, sizeof(n2n_REGISTER_t));
retval += decode_cookie(&reg->cookie, base, rem, idx);
retval += decode_mac(reg->srcMac, base, rem, idx);
retval += decode_mac(reg->dstMac, base, rem, idx);
if(cmn->flags & N2N_FLAGS_SOCKET) {
retval += decode_sock(&(reg->sock), base, rem, idx);
}
retval += decode_uint32(&(reg->dev_addr.net_addr), base, rem, idx);
retval += decode_uint8(&(reg->dev_addr.net_bitlen), base, rem, idx);
retval += decode_buf(reg->dev_desc, N2N_DESC_SIZE, base, rem, idx);
return retval;
}
int encode_REGISTER_SUPER (uint8_t *base,
size_t *idx,
const n2n_common_t *common,
const n2n_REGISTER_SUPER_t *reg) {
int retval = 0;
retval += encode_common(base, idx, common);
retval += encode_cookie(base, idx, reg->cookie);
retval += encode_mac(base, idx, reg->edgeMac);
if(common->flags & N2N_FLAGS_SOCKET) {
retval += encode_sock(base, idx, &(reg->sock));
}
retval += encode_uint32(base, idx, reg->dev_addr.net_addr);
retval += encode_uint8(base, idx, reg->dev_addr.net_bitlen);
retval += encode_buf(base, idx, reg->dev_desc, N2N_DESC_SIZE);
retval += encode_uint16(base, idx, reg->auth.scheme);
retval += encode_uint16(base, idx, reg->auth.token_size);
retval += encode_buf(base, idx, reg->auth.token, reg->auth.token_size);
retval += encode_uint32(base, idx, reg->key_time);
return retval;
}
int decode_REGISTER_SUPER (n2n_REGISTER_SUPER_t *reg,
const n2n_common_t *cmn, /* info on how to interpret it */
const uint8_t *base,
size_t *rem,
size_t *idx) {
size_t retval = 0;
memset(reg, 0, sizeof(n2n_REGISTER_SUPER_t));
retval += decode_cookie(&reg->cookie, base, rem, idx);
retval += decode_mac(reg->edgeMac, base, rem, idx);
if(cmn->flags & N2N_FLAGS_SOCKET) {
retval += decode_sock(&(reg->sock), base, rem, idx);
}
retval += decode_uint32(&(reg->dev_addr.net_addr), base, rem, idx);
retval += decode_uint8(&(reg->dev_addr.net_bitlen), base, rem, idx);
retval += decode_buf(reg->dev_desc, N2N_DESC_SIZE, base, rem, idx);
retval += decode_uint16(&(reg->auth.scheme), base, rem, idx);
retval += decode_uint16(&(reg->auth.token_size), base, rem, idx);
retval += decode_buf(reg->auth.token, reg->auth.token_size, base, rem, idx);
retval += decode_uint32(&(reg->key_time), base, rem, idx);
return retval;
}
int encode_UNREGISTER_SUPER (uint8_t *base,
size_t *idx,
const n2n_common_t *common,
const n2n_UNREGISTER_SUPER_t *unreg) {
int retval = 0;
retval += encode_common(base, idx, common);
retval += encode_uint16(base, idx, unreg->auth.scheme);
retval += encode_uint16(base, idx, unreg->auth.token_size);
retval += encode_buf(base, idx, unreg->auth.token, unreg->auth.token_size);
retval += encode_mac(base, idx, unreg->srcMac);
return retval;
}
int decode_UNREGISTER_SUPER (n2n_UNREGISTER_SUPER_t *unreg,
const n2n_common_t *cmn, /* info on how to interpret it */
const uint8_t *base,
size_t *rem,
size_t *idx) {
size_t retval = 0;
memset(unreg, 0, sizeof(n2n_UNREGISTER_SUPER_t));
retval += decode_uint16(&(unreg->auth.scheme), base, rem, idx);
retval += decode_uint16(&(unreg->auth.token_size), base, rem, idx);
retval += decode_buf(unreg->auth.token, unreg->auth.token_size, base, rem, idx);
retval += decode_mac(unreg->srcMac, base, rem, idx);
return retval;
}
int encode_REGISTER_ACK (uint8_t *base,
size_t *idx,
const n2n_common_t *common,
const n2n_REGISTER_ACK_t *reg) {
int retval = 0;
retval += encode_common(base, idx, common);
retval += encode_cookie(base, idx, reg->cookie);
retval += encode_mac(base, idx, reg->dstMac);
retval += encode_mac(base, idx, reg->srcMac);
/* The socket in REGISTER_ACK is the socket from which the REGISTER
* arrived. This is sent back to the sender so it knows what its public
* socket is. */
if(common->flags & N2N_FLAGS_SOCKET) {
retval += encode_sock(base, idx, &(reg->sock));
}
return retval;
}
int decode_REGISTER_ACK (n2n_REGISTER_ACK_t *reg,
const n2n_common_t *cmn, /* info on how to interpret it */
const uint8_t *base,
size_t *rem,
size_t *idx) {
size_t retval = 0;
memset(reg, 0, sizeof(n2n_REGISTER_ACK_t));
retval += decode_cookie(&reg->cookie, base, rem, idx);
retval += decode_mac(reg->dstMac, base, rem, idx);
retval += decode_mac(reg->srcMac, base, rem, idx);
/* The socket in REGISTER_ACK is the socket from which the REGISTER
* arrived. This is sent back to the sender so it knows what its public
* socket is. */
if(cmn->flags & N2N_FLAGS_SOCKET) {
retval += decode_sock(&(reg->sock), base, rem, idx);
}
return retval;
}
int encode_REGISTER_SUPER_ACK (uint8_t *base,
size_t *idx,
const n2n_common_t *common,
const n2n_REGISTER_SUPER_ACK_t *reg,
uint8_t *tmpbuf) {
int retval = 0;
retval += encode_common(base, idx, common);
retval += encode_cookie(base, idx, reg->cookie);
retval += encode_mac(base, idx, reg->srcMac);
retval += encode_uint32(base, idx, reg->dev_addr.net_addr);
retval += encode_uint8(base, idx, reg->dev_addr.net_bitlen);
retval += encode_uint16(base, idx, reg->lifetime);
retval += encode_sock(base, idx, &(reg->sock));
retval += encode_uint16(base, idx, reg->auth.scheme);
retval += encode_uint16(base, idx, reg->auth.token_size);
retval += encode_buf(base, idx, reg->auth.token, reg->auth.token_size);
retval += encode_uint8(base, idx, reg->num_sn);
retval += encode_buf(base, idx, tmpbuf, (reg->num_sn*REG_SUPER_ACK_PAYLOAD_ENTRY_SIZE));
retval += encode_uint32(base, idx, reg->key_time);
return retval;
}
int decode_REGISTER_SUPER_ACK (n2n_REGISTER_SUPER_ACK_t *reg,
const n2n_common_t *cmn, /* info on how to interpret it */
const uint8_t *base,
size_t *rem,
size_t *idx,
uint8_t *tmpbuf) {
size_t retval = 0;
memset(reg, 0, sizeof(n2n_REGISTER_SUPER_ACK_t));
retval += decode_cookie(&reg->cookie, base, rem, idx);
retval += decode_mac(reg->srcMac, base, rem, idx);
retval += decode_uint32(&(reg->dev_addr.net_addr), base, rem, idx);
retval += decode_uint8(&(reg->dev_addr.net_bitlen), base, rem, idx);
retval += decode_uint16(&(reg->lifetime), base, rem, idx);
/* Socket is mandatory in this message type */
retval += decode_sock(&(reg->sock), base, rem, idx);
retval += decode_uint16(&(reg->auth.scheme), base, rem, idx);
retval += decode_uint16(&(reg->auth.token_size), base, rem, idx);
retval += decode_buf(reg->auth.token, reg->auth.token_size, base, rem, idx);
/* Following the edge socket are an array of backup supernodes. */
retval += decode_uint8(&(reg->num_sn), base, rem, idx);
retval += decode_buf(tmpbuf, (reg->num_sn * REG_SUPER_ACK_PAYLOAD_ENTRY_SIZE), base, rem, idx);
retval += decode_uint32(&(reg->key_time), base, rem, idx);
return retval;
}
int encode_REGISTER_SUPER_NAK (uint8_t *base,
size_t *idx,
const n2n_common_t *common,
const n2n_REGISTER_SUPER_NAK_t *nak) {
int retval = 0;
retval += encode_common(base, idx, common);
retval += encode_cookie(base, idx, nak->cookie);
retval += encode_mac(base, idx, nak->srcMac);
retval += encode_uint16(base, idx, nak->auth.scheme);
retval += encode_uint16(base, idx, nak->auth.token_size);
retval += encode_buf(base, idx, nak->auth.token, nak->auth.token_size);
return retval;
}
int decode_REGISTER_SUPER_NAK (n2n_REGISTER_SUPER_NAK_t *nak,
const n2n_common_t *cmn, /* info on how to interpret it */
const uint8_t *base,
size_t *rem,
size_t *idx) {
size_t retval = 0;
memset(nak, 0, sizeof(n2n_REGISTER_SUPER_NAK_t));
retval += decode_cookie(&nak->cookie, base, rem, idx);
retval += decode_mac(nak->srcMac, base, rem, idx);
retval += decode_uint16(&(nak->auth.scheme), base, rem, idx);
retval += decode_uint16(&(nak->auth.token_size), base, rem, idx);
retval += decode_buf(nak->auth.token, nak->auth.token_size, base, rem, idx);
return retval;
}
int fill_sockaddr (struct sockaddr * addr,
size_t addrlen,
const n2n_sock_t * sock) {
int retval = -1;
if(AF_INET == sock->family) {
if(addrlen >= sizeof(struct sockaddr_in)) {
struct sockaddr_in * si = (struct sockaddr_in *)addr;
si->sin_family = sock->family;
si->sin_port = htons(sock->port);
memcpy(&(si->sin_addr.s_addr), sock->addr.v4, IPV4_SIZE);
retval = 0;
}
}
if(AF_INET6 == sock->family) {
if(addrlen >= sizeof(struct sockaddr_in6)) {
struct sockaddr_in6 * si = (struct sockaddr_in6 *)addr;
si->sin6_family = sock->family;
si->sin6_port = htons(sock->port);
memcpy(&(si->sin6_addr.s6_addr), sock->addr.v6, IPV6_SIZE);
retval = 0;
}
}
return retval;
}
// fills struct sockaddr's data into n2n_sock
int fill_n2nsock (n2n_sock_t* sock, const struct sockaddr* sa) {
#ifdef __APPLE__
sock->family = sa->sa_family;
#else
sock->family = *(sa_family_t*)sa;
#endif
switch(sock->family) {
case AF_INET: {
sock->port = ntohs(((struct sockaddr_in*)sa)->sin_port);
memcpy(sock->addr.v4, &((struct sockaddr_in*)sa)->sin_addr.s_addr, sizeof(struct in_addr));
break;
}
case AF_INET6: {
sock->port = ntohs(((struct sockaddr_in6*)sa)->sin6_port);
memcpy(sock->addr.v6, &((struct sockaddr_in6*)sa)->sin6_addr.s6_addr, sizeof(struct in6_addr));
break;
}
default:
sock->family = AF_INVALID;
return -1;
break; /* well, ... */
}
return 0;
}
int encode_PACKET (uint8_t * base,
size_t * idx,
const n2n_common_t * common,
const n2n_PACKET_t * pkt) {
int retval = 0;
retval += encode_common(base, idx, common);
retval += encode_mac(base, idx, pkt->srcMac);
retval += encode_mac(base, idx, pkt->dstMac);
if(common->flags & N2N_FLAGS_SOCKET) {
retval += encode_sock(base, idx, &(pkt->sock));
}
retval += encode_uint8(base, idx, pkt->compression);
retval += encode_uint8(base, idx, pkt->transform);
return retval;
}
int decode_PACKET (n2n_PACKET_t * pkt,
const n2n_common_t * cmn, /* info on how to interpret it */
const uint8_t * base,
size_t * rem,
size_t * idx) {
size_t retval = 0;
memset(pkt, 0, sizeof(n2n_PACKET_t));
retval += decode_mac(pkt->srcMac, base, rem, idx);
retval += decode_mac(pkt->dstMac, base, rem, idx);
if(cmn->flags & N2N_FLAGS_SOCKET) {
retval += decode_sock(&(pkt->sock), base, rem, idx);
}
retval += decode_uint8(&(pkt->compression), base, rem, idx);
retval += decode_uint8(&(pkt->transform), base, rem, idx);
return retval;
}
int encode_PEER_INFO (uint8_t *base,
size_t *idx,
const n2n_common_t *cmn,
const n2n_PEER_INFO_t *pkt) {
int retval = 0;
retval += encode_common(base, idx, cmn);
retval += encode_uint16(base, idx, pkt->aflags);
retval += encode_mac(base, idx, pkt->srcMac);
retval += encode_mac(base, idx, pkt->mac);
retval += encode_sock(base, idx, &pkt->sock);
if(cmn->flags & N2N_FLAGS_SOCKET) {
retval += encode_sock(base, idx, &pkt->preferred_sock);
}
retval += encode_uint32(base, idx, (uint32_t)pkt->load);
retval += encode_uint32(base, idx, (uint32_t)pkt->uptime);
retval += encode_buf(base, idx, pkt->version, sizeof(n2n_version_t));
return retval;
}
int decode_PEER_INFO (n2n_PEER_INFO_t *pkt,
const n2n_common_t *cmn, /* info on how to interpret it */
const uint8_t *base,
size_t *rem,
size_t *idx) {
size_t retval = 0;
memset(pkt, 0, sizeof(n2n_PEER_INFO_t));
retval += decode_uint16(&(pkt->aflags), base, rem, idx);
retval += decode_mac(pkt->srcMac, base, rem, idx);
retval += decode_mac(pkt->mac, base, rem, idx);
retval += decode_sock(&pkt->sock, base, rem, idx);
if(cmn->flags & N2N_FLAGS_SOCKET) {
retval += decode_sock(&pkt->preferred_sock, base, rem, idx);
}
retval += decode_uint32(&pkt->load, base, rem, idx);
retval += decode_uint32((uint32_t*)&pkt->uptime, base, rem, idx);
retval += decode_buf((uint8_t*)pkt->version, sizeof(n2n_version_t), base, rem, idx);
return retval;
}
int encode_QUERY_PEER (uint8_t * base,
size_t * idx,
const n2n_common_t * common,
const n2n_QUERY_PEER_t * pkt) {
int retval = 0;
retval += encode_common(base, idx, common);
retval += encode_mac(base, idx, pkt->srcMac);
retval += encode_mac(base, idx, pkt->targetMac);
retval += encode_uint16(base, idx, pkt->aflags);
return retval;
}
int decode_QUERY_PEER (n2n_QUERY_PEER_t * pkt,
const n2n_common_t * cmn, /* info on how to interpret it */
const uint8_t * base,
size_t * rem,
size_t * idx) {
size_t retval = 0;
memset(pkt, 0, sizeof(n2n_QUERY_PEER_t));
retval += decode_mac(pkt->srcMac, base, rem, idx);
retval += decode_mac(pkt->targetMac, base, rem, idx);
retval += decode_uint16(&(pkt->aflags), base, rem, idx);
return retval;
}